1 # SPDX-License-Identifier: GPL-2.0 1 # SPDX-License-Identifier: GPL-2.0
2 VERSION = 6 !! 2 VERSION = 5
3 PATCHLEVEL = 12 !! 3 PATCHLEVEL = 16
4 SUBLEVEL = 0 !! 4 SUBLEVEL = 20
5 EXTRAVERSION = -rc7 !! 5 EXTRAVERSION =
6 NAME = Baby Opossum Posse !! 6 NAME = Gobble Gobble
7 7
8 # *DOCUMENTATION* 8 # *DOCUMENTATION*
9 # To see a list of typical targets execute "ma 9 # To see a list of typical targets execute "make help"
10 # More info can be located in ./README 10 # More info can be located in ./README
11 # Comments in this file are targeted only to t 11 # Comments in this file are targeted only to the developer, do not
12 # expect to learn how to build the kernel read 12 # expect to learn how to build the kernel reading this file.
13 13
14 ifeq ($(filter output-sync,$(.FEATURES)),) <<
15 $(error GNU Make >= 4.0 is required. Your Make <<
16 endif <<
17 <<
18 $(if $(filter __%, $(MAKECMDGOALS)), \ 14 $(if $(filter __%, $(MAKECMDGOALS)), \
19 $(error targets prefixed with '__' are 15 $(error targets prefixed with '__' are only for internal use))
20 16
21 # That's our default target when none is given 17 # That's our default target when none is given on the command line
22 PHONY := __all 18 PHONY := __all
23 __all: 19 __all:
24 20
25 # We are using a recursive build, so we need t 21 # We are using a recursive build, so we need to do a little thinking
26 # to get the ordering right. 22 # to get the ordering right.
27 # 23 #
28 # Most importantly: sub-Makefiles should only 24 # Most importantly: sub-Makefiles should only ever modify files in
29 # their own directory. If in some directory we 25 # their own directory. If in some directory we have a dependency on
30 # a file in another dir (which doesn't happen 26 # a file in another dir (which doesn't happen often, but it's often
31 # unavoidable when linking the built-in.a targ 27 # unavoidable when linking the built-in.a targets which finally
32 # turn into vmlinux), we will call a sub make 28 # turn into vmlinux), we will call a sub make in that other dir, and
33 # after that we are sure that everything which 29 # after that we are sure that everything which is in that other dir
34 # is now up to date. 30 # is now up to date.
35 # 31 #
36 # The only cases where we need to modify files 32 # The only cases where we need to modify files which have global
37 # effects are thus separated out and done befo 33 # effects are thus separated out and done before the recursive
38 # descending is started. They are now explicit 34 # descending is started. They are now explicitly listed as the
39 # prepare rule. 35 # prepare rule.
40 36
41 this-makefile := $(lastword $(MAKEFILE_LIST)) <<
42 abs_srctree := $(realpath $(dir $(this-makefil <<
43 abs_objtree := $(CURDIR) <<
44 <<
45 ifneq ($(sub_make_done),1) 37 ifneq ($(sub_make_done),1)
46 38
47 # Do not use make's built-in rules and variabl 39 # Do not use make's built-in rules and variables
48 # (this increases performance and avoids hard- 40 # (this increases performance and avoids hard-to-debug behaviour)
49 MAKEFLAGS += -rR 41 MAKEFLAGS += -rR
50 42
51 # Avoid funny character set dependencies 43 # Avoid funny character set dependencies
52 unexport LC_ALL 44 unexport LC_ALL
53 LC_COLLATE=C 45 LC_COLLATE=C
54 LC_NUMERIC=C 46 LC_NUMERIC=C
55 export LC_COLLATE LC_NUMERIC 47 export LC_COLLATE LC_NUMERIC
56 48
57 # Avoid interference with shell env settings 49 # Avoid interference with shell env settings
58 unexport GREP_OPTIONS 50 unexport GREP_OPTIONS
59 51
60 # Beautify output 52 # Beautify output
61 # -------------------------------------------- 53 # ---------------------------------------------------------------------------
62 # 54 #
63 # Most of build commands in Kbuild start with !! 55 # Normally, we echo the whole command before executing it. By making
64 # "quiet_cmd_*". If defined, the short log is !! 56 # that echo $($(quiet)$(cmd)), we now have the possibility to set
65 # that command is printed by default. !! 57 # $(quiet) to choose other forms of output instead, e.g.
66 # !! 58 #
67 # e.g.) !! 59 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
68 # quiet_cmd_depmod = DEPMOD $(MODLIB) !! 60 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
69 # cmd_depmod = $(srctree)/scripts/dep !! 61 #
>> 62 # If $(quiet) is empty, the whole command will be printed.
>> 63 # If it is set to "quiet_", only the short version will be printed.
>> 64 # If it is set to "silent_", nothing will be printed at all, since
>> 65 # the variable $(silent_cmd_cc_o_c) doesn't exist.
70 # 66 #
71 # A simple variant is to prefix commands with 67 # A simple variant is to prefix commands with $(Q) - that's useful
72 # for commands that shall be hidden in non-ver 68 # for commands that shall be hidden in non-verbose mode.
73 # 69 #
74 # $(Q)$(MAKE) $(build)=scripts/basic !! 70 # $(Q)ln $@ :<
75 # 71 #
76 # If KBUILD_VERBOSE contains 1, the whole comm !! 72 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
77 # If KBUILD_VERBOSE contains 2, the reason for !! 73 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
>> 74 # If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
78 # 75 #
79 # To put more focus on warnings, be less verbo 76 # To put more focus on warnings, be less verbose as default
80 # Use 'make V=1' to see the full commands 77 # Use 'make V=1' to see the full commands
81 78
82 ifeq ("$(origin V)", "command line") 79 ifeq ("$(origin V)", "command line")
83 KBUILD_VERBOSE = $(V) 80 KBUILD_VERBOSE = $(V)
84 endif 81 endif
>> 82 ifndef KBUILD_VERBOSE
>> 83 KBUILD_VERBOSE = 0
>> 84 endif
85 85
86 quiet = quiet_ !! 86 ifeq ($(KBUILD_VERBOSE),1)
87 Q = @ <<
88 <<
89 ifneq ($(findstring 1, $(KBUILD_VERBOSE)),) <<
90 quiet = 87 quiet =
91 Q = 88 Q =
>> 89 else
>> 90 quiet=quiet_
>> 91 Q = @
92 endif 92 endif
93 93
94 # If the user is running make -s (silent mode) 94 # If the user is running make -s (silent mode), suppress echoing of
95 # commands 95 # commands
96 ifneq ($(findstring s,$(firstword -$(MAKEFLAGS !! 96
97 quiet=silent_ !! 97 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
98 override KBUILD_VERBOSE := !! 98 quiet=silent_
>> 99 KBUILD_VERBOSE = 0
99 endif 100 endif
100 101
101 export quiet Q KBUILD_VERBOSE 102 export quiet Q KBUILD_VERBOSE
102 103
103 # Call a source code checker (by default, "spa 104 # Call a source code checker (by default, "sparse") as part of the
104 # C compilation. 105 # C compilation.
105 # 106 #
106 # Use 'make C=1' to enable checking of only re 107 # Use 'make C=1' to enable checking of only re-compiled files.
107 # Use 'make C=2' to enable checking of *all* s 108 # Use 'make C=2' to enable checking of *all* source files, regardless
108 # of whether they are re-compiled or not. 109 # of whether they are re-compiled or not.
109 # 110 #
110 # See the file "Documentation/dev-tools/sparse 111 # See the file "Documentation/dev-tools/sparse.rst" for more details,
111 # including where to get the "sparse" utility. 112 # including where to get the "sparse" utility.
112 113
113 ifeq ("$(origin C)", "command line") 114 ifeq ("$(origin C)", "command line")
114 KBUILD_CHECKSRC = $(C) 115 KBUILD_CHECKSRC = $(C)
115 endif 116 endif
116 ifndef KBUILD_CHECKSRC 117 ifndef KBUILD_CHECKSRC
117 KBUILD_CHECKSRC = 0 118 KBUILD_CHECKSRC = 0
118 endif 119 endif
119 120
120 export KBUILD_CHECKSRC 121 export KBUILD_CHECKSRC
121 122
122 # Enable "clippy" (a linter) as part of the Ru <<
123 # <<
124 # Use 'make CLIPPY=1' to enable it. <<
125 ifeq ("$(origin CLIPPY)", "command line") <<
126 KBUILD_CLIPPY := $(CLIPPY) <<
127 endif <<
128 <<
129 export KBUILD_CLIPPY <<
130 <<
131 # Use make M=dir or set the environment variab 123 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
132 # directory of external module to build. Setti 124 # directory of external module to build. Setting M= takes precedence.
133 ifeq ("$(origin M)", "command line") 125 ifeq ("$(origin M)", "command line")
134 KBUILD_EXTMOD := $(M) 126 KBUILD_EXTMOD := $(M)
135 endif 127 endif
136 128
137 $(if $(word 2, $(KBUILD_EXTMOD)), \ 129 $(if $(word 2, $(KBUILD_EXTMOD)), \
138 $(error building multiple external mod 130 $(error building multiple external modules is not supported))
139 131
140 $(foreach x, % :, $(if $(findstring $x, $(KBUI <<
141 $(error module directory path cannot c <<
142 <<
143 # Remove trailing slashes 132 # Remove trailing slashes
144 ifneq ($(filter %/, $(KBUILD_EXTMOD)),) 133 ifneq ($(filter %/, $(KBUILD_EXTMOD)),)
145 KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTM 134 KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).)
146 endif 135 endif
147 136
148 export KBUILD_EXTMOD 137 export KBUILD_EXTMOD
149 138
150 # backward compatibility <<
151 KBUILD_EXTRA_WARN ?= $(KBUILD_ENABLE_EXTRA_GCC <<
152 <<
153 ifeq ("$(origin W)", "command line") <<
154 KBUILD_EXTRA_WARN := $(W) <<
155 endif <<
156 <<
157 export KBUILD_EXTRA_WARN <<
158 <<
159 # Kbuild will save output files in the current 139 # Kbuild will save output files in the current working directory.
160 # This does not need to match to the root of t 140 # This does not need to match to the root of the kernel source tree.
161 # 141 #
162 # For example, you can do this: 142 # For example, you can do this:
163 # 143 #
164 # cd /dir/to/store/output/files; make -f /dir 144 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
165 # 145 #
166 # If you want to save output files in a differ 146 # If you want to save output files in a different location, there are
167 # two syntaxes to specify it. 147 # two syntaxes to specify it.
168 # 148 #
169 # 1) O= 149 # 1) O=
170 # Use "make O=dir/to/store/output/files/" 150 # Use "make O=dir/to/store/output/files/"
171 # 151 #
172 # 2) Set KBUILD_OUTPUT 152 # 2) Set KBUILD_OUTPUT
173 # Set the environment variable KBUILD_OUTPUT t 153 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
174 # export KBUILD_OUTPUT=dir/to/store/output/fil 154 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
175 # 155 #
176 # The O= assignment takes precedence over the 156 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
177 # variable. 157 # variable.
178 158
179 # Do we want to change the working directory? 159 # Do we want to change the working directory?
180 ifeq ("$(origin O)", "command line") 160 ifeq ("$(origin O)", "command line")
181 KBUILD_OUTPUT := $(O) 161 KBUILD_OUTPUT := $(O)
182 endif 162 endif
183 163
184 ifneq ($(KBUILD_OUTPUT),) 164 ifneq ($(KBUILD_OUTPUT),)
185 # $(realpath ...) gets empty if the path does !! 165 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
186 $(shell mkdir -p "$(KBUILD_OUTPUT)") !! 166 # expand a shell special character '~'. We use a somewhat tedious way here.
>> 167 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
>> 168 $(if $(abs_objtree),, \
>> 169 $(error failed to create output directory "$(KBUILD_OUTPUT)"))
>> 170
187 # $(realpath ...) resolves symlinks 171 # $(realpath ...) resolves symlinks
188 abs_objtree := $(realpath $(KBUILD_OUTPUT)) !! 172 abs_objtree := $(realpath $(abs_objtree))
189 $(if $(abs_objtree),,$(error failed to create !! 173 else
>> 174 abs_objtree := $(CURDIR)
190 endif # ifneq ($(KBUILD_OUTPUT),) 175 endif # ifneq ($(KBUILD_OUTPUT),)
191 176
192 ifneq ($(words $(subst :, ,$(abs_srctree))), 1 !! 177 ifeq ($(abs_objtree),$(CURDIR))
193 $(error source directory cannot contain spaces !! 178 # Suppress "Entering directory ..." unless we are changing the work directory.
>> 179 MAKEFLAGS += --no-print-directory
>> 180 else
>> 181 need-sub-make := 1
194 endif 182 endif
195 183
196 export sub_make_done := 1 !! 184 this-makefile := $(lastword $(MAKEFILE_LIST))
>> 185 abs_srctree := $(realpath $(dir $(this-makefile)))
197 186
198 endif # sub_make_done !! 187 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
>> 188 $(error source directory cannot contain spaces or colons)
>> 189 endif
199 190
200 ifeq ($(abs_objtree),$(CURDIR)) !! 191 ifneq ($(abs_srctree),$(abs_objtree))
201 # Suppress "Entering directory ..." if we are !! 192 # Look for make include files relative to root of kernel src
202 no-print-directory := --no-print-directory !! 193 #
203 else !! 194 # --included-dir is added for backward compatibility, but you should not rely on
204 # Recursion to show "Entering directory ..." !! 195 # it. Please add $(srctree)/ prefix to include Makefiles in the source tree.
205 need-sub-make := 1 !! 196 MAKEFLAGS += --include-dir=$(abs_srctree)
206 endif 197 endif
207 198
208 ifeq ($(filter --no-print-directory, $(MAKEFLA !! 199 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
209 # If --no-print-directory is unset, recurse on !! 200 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
210 # You may end up recursing into __sub-make twi !! 201 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
211 # behavior change in GNU Make 4.4.1. <<
212 need-sub-make := 1 202 need-sub-make := 1
>> 203 # Cancel implicit rules for this Makefile.
>> 204 $(this-makefile): ;
213 endif 205 endif
214 206
>> 207 export abs_srctree abs_objtree
>> 208 export sub_make_done := 1
>> 209
215 ifeq ($(need-sub-make),1) 210 ifeq ($(need-sub-make),1)
216 211
217 PHONY += $(MAKECMDGOALS) __sub-make 212 PHONY += $(MAKECMDGOALS) __sub-make
218 213
219 $(filter-out $(this-makefile), $(MAKECMDGOALS) 214 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
220 @: 215 @:
221 216
222 # Invoke a second make in the output directory 217 # Invoke a second make in the output directory, passing relevant variables
223 __sub-make: 218 __sub-make:
224 $(Q)$(MAKE) $(no-print-directory) -C $ !! 219 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
225 -f $(abs_srctree)/Makefile $(MAKECMDGO <<
226 220
227 else # need-sub-make !! 221 endif # need-sub-make
>> 222 endif # sub_make_done
228 223
229 # We process the rest of the Makefile if this 224 # We process the rest of the Makefile if this is the final invocation of make
>> 225 ifeq ($(need-sub-make),)
>> 226
>> 227 # Do not print "Entering directory ...",
>> 228 # but we want to display it when entering to the output directory
>> 229 # so that IDEs/editors are able to understand relative filenames.
>> 230 MAKEFLAGS += --no-print-directory
230 231
231 ifeq ($(abs_srctree),$(abs_objtree)) 232 ifeq ($(abs_srctree),$(abs_objtree))
232 # building in the source tree 233 # building in the source tree
233 srctree := . 234 srctree := .
234 building_out_of_srctree := 235 building_out_of_srctree :=
235 else 236 else
236 ifeq ($(abs_srctree)/,$(dir $(abs_objt 237 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
237 # building in a subdirectory o 238 # building in a subdirectory of the source tree
238 srctree := .. 239 srctree := ..
239 else 240 else
240 srctree := $(abs_srctree) 241 srctree := $(abs_srctree)
241 endif 242 endif
242 building_out_of_srctree := 1 243 building_out_of_srctree := 1
243 endif 244 endif
244 245
245 ifneq ($(KBUILD_ABS_SRCTREE),) 246 ifneq ($(KBUILD_ABS_SRCTREE),)
246 srctree := $(abs_srctree) 247 srctree := $(abs_srctree)
247 endif 248 endif
248 249
249 objtree := . 250 objtree := .
250 <<
251 VPATH := <<
252 <<
253 ifeq ($(KBUILD_EXTMOD),) <<
254 ifdef building_out_of_srctree <<
255 VPATH := $(srctree) 251 VPATH := $(srctree)
256 endif <<
257 endif <<
258 252
259 export building_out_of_srctree srctree objtree 253 export building_out_of_srctree srctree objtree VPATH
260 254
261 # To make sure we do not include .config for a 255 # To make sure we do not include .config for any of the *config targets
262 # catch them early, and hand them over to scri 256 # catch them early, and hand them over to scripts/kconfig/Makefile
263 # It is allowed to specify more targets when c 257 # It is allowed to specify more targets when calling make, including
264 # mixing *config targets and build targets. 258 # mixing *config targets and build targets.
265 # For example 'make oldconfig all'. 259 # For example 'make oldconfig all'.
266 # Detect when mixed targets is specified, and 260 # Detect when mixed targets is specified, and make a second invocation
267 # of make so .config is not included in this c 261 # of make so .config is not included in this case either (for *config).
268 262
269 version_h := include/generated/uapi/linux/vers 263 version_h := include/generated/uapi/linux/version.h
270 264
271 clean-targets := %clean mrproper cleandocs 265 clean-targets := %clean mrproper cleandocs
272 no-dot-config-targets := $(clean-targets) \ 266 no-dot-config-targets := $(clean-targets) \
273 cscope gtags TAGS tag 267 cscope gtags TAGS tags help% %docs check% coccicheck \
274 $(version_h) headers 268 $(version_h) headers headers_% archheaders archscripts \
275 %asm-generic kernelve 269 %asm-generic kernelversion %src-pkg dt_binding_check \
276 outputmakefile rustav !! 270 outputmakefile
277 no-sync-config-targets := $(no-dot-config-targ !! 271 # Installation targets should not require compiler. Unfortunately, vdso_install
>> 272 # is an exception where build artifacts may be updated. This must be fixed.
>> 273 no-compiler-targets := $(no-dot-config-targets) install dtbs_install \
>> 274 headers_install modules_install kernelrelease image_name
>> 275 no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \
278 image_name 276 image_name
279 single-targets := %.a %.i %.ko %.lds %.ll %.ls !! 277 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
280 278
281 config-build := 279 config-build :=
282 mixed-build := 280 mixed-build :=
283 need-config := 1 281 need-config := 1
>> 282 need-compiler := 1
284 may-sync-config := 1 283 may-sync-config := 1
285 single-build := 284 single-build :=
286 285
287 ifneq ($(filter $(no-dot-config-targets), $(MA 286 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
288 ifeq ($(filter-out $(no-dot-config-targets !! 287 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
289 need-config := !! 288 need-config :=
290 endif !! 289 endif
291 endif 290 endif
292 291
293 ifneq ($(filter $(no-sync-config-targets), $(M !! 292 ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),)
294 ifeq ($(filter-out $(no-sync-config-target !! 293 ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),)
295 may-sync-config := !! 294 need-compiler :=
296 endif !! 295 endif
297 endif 296 endif
298 297
299 need-compiler := $(may-sync-config) !! 298 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
>> 299 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
>> 300 may-sync-config :=
>> 301 endif
>> 302 endif
300 303
301 ifneq ($(KBUILD_EXTMOD),) 304 ifneq ($(KBUILD_EXTMOD),)
302 may-sync-config := !! 305 may-sync-config :=
303 endif 306 endif
304 307
305 ifeq ($(KBUILD_EXTMOD),) 308 ifeq ($(KBUILD_EXTMOD),)
306 ifneq ($(filter %config,$(MAKECMDGOALS)),) !! 309 ifneq ($(filter %config,$(MAKECMDGOALS)),)
307 config-build := 1 !! 310 config-build := 1
308 ifneq ($(words $(MAKECMDGOALS)),1) !! 311 ifneq ($(words $(MAKECMDGOALS)),1)
309 mixed-build := 1 !! 312 mixed-build := 1
>> 313 endif
310 endif 314 endif
311 endif <<
312 endif 315 endif
313 316
314 # We cannot build single targets and the other 317 # We cannot build single targets and the others at the same time
315 ifneq ($(filter $(single-targets), $(MAKECMDGO 318 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
316 single-build := 1 !! 319 single-build := 1
317 ifneq ($(filter-out $(single-targets), $(M !! 320 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
318 mixed-build := 1 !! 321 mixed-build := 1
319 endif !! 322 endif
320 endif 323 endif
321 324
322 # For "make -j clean all", "make -j mrproper d 325 # For "make -j clean all", "make -j mrproper defconfig all", etc.
323 ifneq ($(filter $(clean-targets),$(MAKECMDGOAL 326 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
324 ifneq ($(filter-out $(clean-targets),$(MAK !! 327 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
325 mixed-build := 1 !! 328 mixed-build := 1
326 endif !! 329 endif
327 endif 330 endif
328 331
329 # install and modules_install need also be pro 332 # install and modules_install need also be processed one by one
330 ifneq ($(filter install,$(MAKECMDGOALS)),) 333 ifneq ($(filter install,$(MAKECMDGOALS)),)
331 ifneq ($(filter modules_install,$(MAKECMDG !! 334 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
332 mixed-build := 1 !! 335 mixed-build := 1
333 endif !! 336 endif
334 endif 337 endif
335 338
336 ifdef mixed-build 339 ifdef mixed-build
337 # ============================================ 340 # ===========================================================================
338 # We're called with mixed targets (*config and 341 # We're called with mixed targets (*config and build targets).
339 # Handle them one by one. 342 # Handle them one by one.
340 343
341 PHONY += $(MAKECMDGOALS) __build_one_by_one 344 PHONY += $(MAKECMDGOALS) __build_one_by_one
342 345
343 $(MAKECMDGOALS): __build_one_by_one 346 $(MAKECMDGOALS): __build_one_by_one
344 @: 347 @:
345 348
346 __build_one_by_one: 349 __build_one_by_one:
347 $(Q)set -e; \ 350 $(Q)set -e; \
348 for i in $(MAKECMDGOALS); do \ 351 for i in $(MAKECMDGOALS); do \
349 $(MAKE) -f $(srctree)/Makefile 352 $(MAKE) -f $(srctree)/Makefile $$i; \
350 done 353 done
351 354
352 else # !mixed-build 355 else # !mixed-build
353 356
354 include $(srctree)/scripts/Kbuild.include 357 include $(srctree)/scripts/Kbuild.include
355 358
356 # Read KERNELRELEASE from include/config/kerne 359 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
357 KERNELRELEASE = $(call read-file, include/conf !! 360 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
358 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),. 361 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
359 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEA 362 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
360 363
361 include $(srctree)/scripts/subarch.include 364 include $(srctree)/scripts/subarch.include
362 365
363 # Cross compiling and selecting different set 366 # Cross compiling and selecting different set of gcc/bin-utils
364 # -------------------------------------------- 367 # ---------------------------------------------------------------------------
365 # 368 #
366 # When performing cross compilation for other 369 # When performing cross compilation for other architectures ARCH shall be set
367 # to the target architecture. (See arch/* for 370 # to the target architecture. (See arch/* for the possibilities).
368 # ARCH can be set during invocation of make: 371 # ARCH can be set during invocation of make:
369 # make ARCH=arm64 !! 372 # make ARCH=ia64
370 # Another way is to have ARCH set in the envir 373 # Another way is to have ARCH set in the environment.
371 # The default ARCH is the host where make is e 374 # The default ARCH is the host where make is executed.
372 375
373 # CROSS_COMPILE specify the prefix used for al 376 # CROSS_COMPILE specify the prefix used for all executables used
374 # during compilation. Only gcc and related bin 377 # during compilation. Only gcc and related bin-utils executables
375 # are prefixed with $(CROSS_COMPILE). 378 # are prefixed with $(CROSS_COMPILE).
376 # CROSS_COMPILE can be set on the command line 379 # CROSS_COMPILE can be set on the command line
377 # make CROSS_COMPILE=aarch64-linux-gnu- !! 380 # make CROSS_COMPILE=ia64-linux-
378 # Alternatively CROSS_COMPILE can be set in th 381 # Alternatively CROSS_COMPILE can be set in the environment.
379 # Default value for CROSS_COMPILE is not to pr 382 # Default value for CROSS_COMPILE is not to prefix executables
380 # Note: Some architectures assign CROSS_COMPIL 383 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
381 ARCH ?= $(SUBARCH) 384 ARCH ?= $(SUBARCH)
382 385
383 # Architecture as present in compile.h 386 # Architecture as present in compile.h
384 UTS_MACHINE := $(ARCH) 387 UTS_MACHINE := $(ARCH)
385 SRCARCH := $(ARCH) 388 SRCARCH := $(ARCH)
386 389
387 # Additional ARCH settings for x86 390 # Additional ARCH settings for x86
388 ifeq ($(ARCH),i386) 391 ifeq ($(ARCH),i386)
389 SRCARCH := x86 392 SRCARCH := x86
390 endif 393 endif
391 ifeq ($(ARCH),x86_64) 394 ifeq ($(ARCH),x86_64)
392 SRCARCH := x86 395 SRCARCH := x86
393 endif 396 endif
394 397
395 # Additional ARCH settings for sparc 398 # Additional ARCH settings for sparc
396 ifeq ($(ARCH),sparc32) 399 ifeq ($(ARCH),sparc32)
397 SRCARCH := sparc 400 SRCARCH := sparc
398 endif 401 endif
399 ifeq ($(ARCH),sparc64) 402 ifeq ($(ARCH),sparc64)
400 SRCARCH := sparc 403 SRCARCH := sparc
401 endif 404 endif
402 405
403 # Additional ARCH settings for parisc 406 # Additional ARCH settings for parisc
404 ifeq ($(ARCH),parisc64) 407 ifeq ($(ARCH),parisc64)
405 SRCARCH := parisc 408 SRCARCH := parisc
406 endif 409 endif
407 410
408 export cross_compiling := 411 export cross_compiling :=
409 ifneq ($(SRCARCH),$(SUBARCH)) 412 ifneq ($(SRCARCH),$(SUBARCH))
410 cross_compiling := 1 413 cross_compiling := 1
411 endif 414 endif
412 415
413 KCONFIG_CONFIG ?= .config 416 KCONFIG_CONFIG ?= .config
414 export KCONFIG_CONFIG 417 export KCONFIG_CONFIG
415 418
416 # SHELL used by kbuild 419 # SHELL used by kbuild
417 CONFIG_SHELL := sh 420 CONFIG_SHELL := sh
418 421
419 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 422 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
420 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAG 423 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
421 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/d 424 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
422 425
423 ifneq ($(LLVM),) 426 ifneq ($(LLVM),)
424 ifneq ($(filter %/,$(LLVM)),) !! 427 HOSTCC = clang
425 LLVM_PREFIX := $(LLVM) !! 428 HOSTCXX = clang++
426 else ifneq ($(filter -%,$(LLVM)),) <<
427 LLVM_SUFFIX := $(LLVM) <<
428 endif <<
429 <<
430 HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) <<
431 HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) <<
432 else 429 else
433 HOSTCC = gcc 430 HOSTCC = gcc
434 HOSTCXX = g++ 431 HOSTCXX = g++
435 endif 432 endif
436 HOSTRUSTC = rustc <<
437 HOSTPKG_CONFIG = pkg-config <<
438 433
439 KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-proto !! 434 export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
440 -O2 -fomit-frame-poin !! 435 -O2 -fomit-frame-pointer -std=gnu89
441 KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) !! 436 export KBUILD_USERLDFLAGS :=
442 KBUILD_USERLDFLAGS := $(USERLDFLAGS) !! 437
443 !! 438 KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
444 # These flags apply to all Rust code in the tr !! 439 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
445 # host programs. <<
446 export rust_common_flags := --edition=2021 \ <<
447 -Zbinary_dep_depin <<
448 -Astable_features <<
449 -Dunsafe_op_in_uns <<
450 -Dnon_ascii_idents <<
451 -Wrust_2018_idioms <<
452 -Wunreachable_pub <<
453 -Wmissing_docs \ <<
454 -Wrustdoc::missing <<
455 -Wclippy::all \ <<
456 -Wclippy::mut_mut <<
457 -Wclippy::needless <<
458 -Wclippy::needless <<
459 -Wclippy::no_mangl <<
460 -Wclippy::dbg_macr <<
461 <<
462 KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS <<
463 $(HOSTCFLAGS) -I $(srct <<
464 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CF <<
465 -I $(srctree)/scripts/i <<
466 KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) - <<
467 -Zallow-features= $(HO <<
468 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(H 440 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
469 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOST 441 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
470 442
471 # Make variables (CC, etc...) 443 # Make variables (CC, etc...)
472 CPP = $(CC) -E 444 CPP = $(CC) -E
473 ifneq ($(LLVM),) 445 ifneq ($(LLVM),)
474 CC = $(LLVM_PREFIX)clang$(LLVM_SU !! 446 CC = clang
475 LD = $(LLVM_PREFIX)ld.lld$(LLVM_S !! 447 LD = ld.lld
476 AR = $(LLVM_PREFIX)llvm-ar$(LLVM_ !! 448 AR = llvm-ar
477 NM = $(LLVM_PREFIX)llvm-nm$(LLVM_ !! 449 NM = llvm-nm
478 OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$( !! 450 OBJCOPY = llvm-objcopy
479 OBJDUMP = $(LLVM_PREFIX)llvm-objdump$( !! 451 OBJDUMP = llvm-objdump
480 READELF = $(LLVM_PREFIX)llvm-readelf$( !! 452 READELF = llvm-readelf
481 STRIP = $(LLVM_PREFIX)llvm-strip$(LL !! 453 STRIP = llvm-strip
482 else 454 else
483 CC = $(CROSS_COMPILE)gcc 455 CC = $(CROSS_COMPILE)gcc
484 LD = $(CROSS_COMPILE)ld 456 LD = $(CROSS_COMPILE)ld
485 AR = $(CROSS_COMPILE)ar 457 AR = $(CROSS_COMPILE)ar
486 NM = $(CROSS_COMPILE)nm 458 NM = $(CROSS_COMPILE)nm
487 OBJCOPY = $(CROSS_COMPILE)objcopy 459 OBJCOPY = $(CROSS_COMPILE)objcopy
488 OBJDUMP = $(CROSS_COMPILE)objdump 460 OBJDUMP = $(CROSS_COMPILE)objdump
489 READELF = $(CROSS_COMPILE)readelf 461 READELF = $(CROSS_COMPILE)readelf
490 STRIP = $(CROSS_COMPILE)strip 462 STRIP = $(CROSS_COMPILE)strip
491 endif 463 endif
492 RUSTC = rustc <<
493 RUSTDOC = rustdoc <<
494 RUSTFMT = rustfmt <<
495 CLIPPY_DRIVER = clippy-driver <<
496 BINDGEN = bindgen <<
497 PAHOLE = pahole 464 PAHOLE = pahole
498 RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve 465 RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
499 LEX = flex 466 LEX = flex
500 YACC = bison 467 YACC = bison
501 AWK = awk 468 AWK = awk
502 INSTALLKERNEL := installkernel 469 INSTALLKERNEL := installkernel
>> 470 DEPMOD = depmod
503 PERL = perl 471 PERL = perl
504 PYTHON3 = python3 472 PYTHON3 = python3
505 CHECK = sparse 473 CHECK = sparse
506 BASH = bash 474 BASH = bash
507 KGZIP = gzip 475 KGZIP = gzip
508 KBZIP2 = bzip2 476 KBZIP2 = bzip2
509 KLZOP = lzop 477 KLZOP = lzop
510 LZMA = lzma 478 LZMA = lzma
511 LZ4 = lz4c 479 LZ4 = lz4c
512 XZ = xz 480 XZ = xz
513 ZSTD = zstd 481 ZSTD = zstd
514 482
>> 483 PAHOLE_FLAGS = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh)
>> 484
515 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC 485 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
516 -Wbitwise -Wno-return-void - 486 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
517 NOSTDINC_FLAGS := 487 NOSTDINC_FLAGS :=
518 CFLAGS_MODULE = 488 CFLAGS_MODULE =
519 RUSTFLAGS_MODULE = <<
520 AFLAGS_MODULE = 489 AFLAGS_MODULE =
521 LDFLAGS_MODULE = 490 LDFLAGS_MODULE =
522 CFLAGS_KERNEL = 491 CFLAGS_KERNEL =
523 RUSTFLAGS_KERNEL = <<
524 AFLAGS_KERNEL = 492 AFLAGS_KERNEL =
525 LDFLAGS_vmlinux = 493 LDFLAGS_vmlinux =
526 494
527 # Use USERINCLUDE when you must reference the 495 # Use USERINCLUDE when you must reference the UAPI directories only.
528 USERINCLUDE := \ 496 USERINCLUDE := \
529 -I$(srctree)/arch/$(SRCARCH)/i 497 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
530 -I$(objtree)/arch/$(SRCARCH)/i 498 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
531 -I$(srctree)/include/uapi \ 499 -I$(srctree)/include/uapi \
532 -I$(objtree)/include/generated 500 -I$(objtree)/include/generated/uapi \
533 -include $(srctree)/include/li 501 -include $(srctree)/include/linux/compiler-version.h \
534 -include $(srctree)/include/li 502 -include $(srctree)/include/linux/kconfig.h
535 503
536 # Use LINUXINCLUDE when you must reference the 504 # Use LINUXINCLUDE when you must reference the include/ directory.
537 # Needed to be compatible with the O= option 505 # Needed to be compatible with the O= option
538 LINUXINCLUDE := \ 506 LINUXINCLUDE := \
539 -I$(srctree)/arch/$(SRCARCH)/i 507 -I$(srctree)/arch/$(SRCARCH)/include \
540 -I$(objtree)/arch/$(SRCARCH)/i 508 -I$(objtree)/arch/$(SRCARCH)/include/generated \
541 $(if $(building_out_of_srctree 509 $(if $(building_out_of_srctree),-I$(srctree)/include) \
542 -I$(objtree)/include \ 510 -I$(objtree)/include \
543 $(USERINCLUDE) 511 $(USERINCLUDE)
544 512
545 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 513 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
546 !! 514 KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
547 KBUILD_CFLAGS := !! 515 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
548 KBUILD_CFLAGS += -std=gnu11 !! 516 -Werror=implicit-function-declaration -Werror=implicit-int \
549 KBUILD_CFLAGS += -fshort-wchar !! 517 -Werror=return-type -Wno-format-security \
550 KBUILD_CFLAGS += -funsigned-char !! 518 -std=gnu89
551 KBUILD_CFLAGS += -fno-common <<
552 KBUILD_CFLAGS += -fno-PIE <<
553 KBUILD_CFLAGS += -fno-strict-aliasing <<
554 <<
555 KBUILD_CPPFLAGS := -D__KERNEL__ 519 KBUILD_CPPFLAGS := -D__KERNEL__
556 KBUILD_RUSTFLAGS := $(rust_common_flags) \ <<
557 -Cpanic=abort -Cembed-bitc <<
558 -Cforce-unwind-tables=n -C <<
559 -Csymbol-mangling-version= <<
560 -Crelocation-model=static <<
561 -Zfunction-sections=n \ <<
562 -Wclippy::float_arithmetic <<
563 <<
564 KBUILD_AFLAGS_KERNEL := 520 KBUILD_AFLAGS_KERNEL :=
565 KBUILD_CFLAGS_KERNEL := 521 KBUILD_CFLAGS_KERNEL :=
566 KBUILD_RUSTFLAGS_KERNEL := <<
567 KBUILD_AFLAGS_MODULE := -DMODULE 522 KBUILD_AFLAGS_MODULE := -DMODULE
568 KBUILD_CFLAGS_MODULE := -DMODULE 523 KBUILD_CFLAGS_MODULE := -DMODULE
569 KBUILD_RUSTFLAGS_MODULE := --cfg MODULE <<
570 KBUILD_LDFLAGS_MODULE := 524 KBUILD_LDFLAGS_MODULE :=
571 KBUILD_LDFLAGS := 525 KBUILD_LDFLAGS :=
572 CLANG_FLAGS := 526 CLANG_FLAGS :=
573 527
574 ifeq ($(KBUILD_CLIPPY),1) !! 528 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
575 RUSTC_OR_CLIPPY_QUIET := CLIPPY <<
576 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) <<
577 else <<
578 RUSTC_OR_CLIPPY_QUIET := RUSTC <<
579 RUSTC_OR_CLIPPY = $(RUSTC) <<
580 endif <<
581 <<
582 # Allows the usage of unstable features in sta <<
583 export RUSTC_BOOTSTRAP := 1 <<
584 <<
585 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC K <<
586 export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_Q <<
587 export HOSTRUSTC KBUILD_HOSTRUSTFLAGS <<
588 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF 529 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
589 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_ 530 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
590 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 531 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
591 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS 532 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
592 export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS <<
593 533
594 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINC 534 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
595 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODU 535 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
596 export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTF <<
597 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODU 536 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
598 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODU !! 537 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
599 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERN !! 538 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
>> 539 export PAHOLE_FLAGS
600 540
601 # Files to ignore in find ... statements 541 # Files to ignore in find ... statements
602 542
603 export RCS_FIND_IGNORE := \( -name SCCS -o -na 543 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
604 -name CVS -o -name . 544 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
605 -prune -o 545 -prune -o
>> 546 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
>> 547 --exclude CVS --exclude .pc --exclude .hg --exclude .git
606 548
607 # ============================================ 549 # ===========================================================================
608 # Rules shared between *config targets and bui 550 # Rules shared between *config targets and build targets
609 551
610 # Basic helpers built in scripts/basic/ 552 # Basic helpers built in scripts/basic/
611 PHONY += scripts_basic 553 PHONY += scripts_basic
612 scripts_basic: 554 scripts_basic:
613 $(Q)$(MAKE) $(build)=scripts/basic 555 $(Q)$(MAKE) $(build)=scripts/basic
614 556
615 PHONY += outputmakefile 557 PHONY += outputmakefile
616 ifdef building_out_of_srctree 558 ifdef building_out_of_srctree
617 # Before starting out-of-tree build, make sure 559 # Before starting out-of-tree build, make sure the source tree is clean.
618 # outputmakefile generates a Makefile in the o 560 # outputmakefile generates a Makefile in the output directory, if using a
619 # separate output directory. This allows conve 561 # separate output directory. This allows convenient use of make in the
620 # output directory. 562 # output directory.
621 # At the same time when output Makefile genera 563 # At the same time when output Makefile generated, generate .gitignore to
622 # ignore whole output directory 564 # ignore whole output directory
623 565
624 quiet_cmd_makefile = GEN Makefile 566 quiet_cmd_makefile = GEN Makefile
625 cmd_makefile = { \ 567 cmd_makefile = { \
626 echo "\# Automatically generated by $( 568 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \
627 echo "include $(srctree)/Makefile"; \ 569 echo "include $(srctree)/Makefile"; \
628 } > Makefile 570 } > Makefile
629 571
630 outputmakefile: 572 outputmakefile:
631 @if [ -f $(srctree)/.config -o \ !! 573 $(Q)if [ -f $(srctree)/.config -o \
632 -d $(srctree)/include/config 574 -d $(srctree)/include/config -o \
633 -d $(srctree)/arch/$(SRCARCH) 575 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
634 echo >&2 "***"; \ 576 echo >&2 "***"; \
635 echo >&2 "*** The source tree 577 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
636 echo >&2 "*** in $(abs_srctree 578 echo >&2 "*** in $(abs_srctree)";\
637 echo >&2 "***"; \ 579 echo >&2 "***"; \
638 false; \ 580 false; \
639 fi 581 fi
640 $(Q)ln -fsn $(srctree) source 582 $(Q)ln -fsn $(srctree) source
641 $(call cmd,makefile) 583 $(call cmd,makefile)
642 $(Q)test -e .gitignore || \ 584 $(Q)test -e .gitignore || \
643 { echo "# this is build directory, ign 585 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
644 endif 586 endif
645 587
646 # The expansion should be delayed until arch/$ 588 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
647 # Some architectures define CROSS_COMPILE in a 589 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
648 # CC_VERSION_TEXT and RUSTC_VERSION_TEXT are r !! 590 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
649 # need export), and from include/config/auto.c !! 591 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
650 # upgrade. <<
651 CC_VERSION_TEXT = $(subst $(pound),,$(shell LC 592 CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1))
652 RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell <<
653 593
654 ifneq ($(findstring clang,$(CC_VERSION_TEXT)), 594 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
655 include $(srctree)/scripts/Makefile.clang 595 include $(srctree)/scripts/Makefile.clang
656 endif 596 endif
657 597
658 # Include this also for config targets because 598 # Include this also for config targets because some architectures need
659 # cc-cross-prefix to determine CROSS_COMPILE. 599 # cc-cross-prefix to determine CROSS_COMPILE.
660 ifdef need-compiler 600 ifdef need-compiler
661 include $(srctree)/scripts/Makefile.compiler 601 include $(srctree)/scripts/Makefile.compiler
662 endif 602 endif
663 603
664 ifdef config-build 604 ifdef config-build
665 # ============================================ 605 # ===========================================================================
666 # *config targets only - make sure prerequisit 606 # *config targets only - make sure prerequisites are updated, and descend
667 # in scripts/kconfig to make the *config targe 607 # in scripts/kconfig to make the *config target
668 608
669 # Read arch-specific Makefile to set KBUILD_DE !! 609 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
670 # KBUILD_DEFCONFIG may point out an alternativ 610 # KBUILD_DEFCONFIG may point out an alternative default configuration
671 # used for 'make defconfig' 611 # used for 'make defconfig'
672 include $(srctree)/arch/$(SRCARCH)/Makefile 612 include $(srctree)/arch/$(SRCARCH)/Makefile
673 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERS !! 613 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
674 614
675 config: outputmakefile scripts_basic FORCE 615 config: outputmakefile scripts_basic FORCE
676 $(Q)$(MAKE) $(build)=scripts/kconfig $ 616 $(Q)$(MAKE) $(build)=scripts/kconfig $@
677 617
678 %config: outputmakefile scripts_basic FORCE 618 %config: outputmakefile scripts_basic FORCE
679 $(Q)$(MAKE) $(build)=scripts/kconfig $ 619 $(Q)$(MAKE) $(build)=scripts/kconfig $@
680 620
681 else #!config-build 621 else #!config-build
682 # ============================================ 622 # ===========================================================================
683 # Build targets only - this includes vmlinux, !! 623 # Build targets only - this includes vmlinux, arch specific targets, clean
684 # targets and others. In general all targets e 624 # targets and others. In general all targets except *config targets.
685 625
686 # If building an external module we do not car 626 # If building an external module we do not care about the all: rule
687 # but instead __all depend on modules 627 # but instead __all depend on modules
688 PHONY += all 628 PHONY += all
689 ifeq ($(KBUILD_EXTMOD),) 629 ifeq ($(KBUILD_EXTMOD),)
690 __all: all 630 __all: all
691 else 631 else
692 __all: modules 632 __all: modules
693 endif 633 endif
694 634
695 targets := <<
696 <<
697 # Decide whether to build built-in, modular, o 635 # Decide whether to build built-in, modular, or both.
698 # Normally, just do built-in. 636 # Normally, just do built-in.
699 637
700 KBUILD_MODULES := 638 KBUILD_MODULES :=
701 KBUILD_BUILTIN := 1 639 KBUILD_BUILTIN := 1
702 640
703 # If we have only "make modules", don't compil 641 # If we have only "make modules", don't compile built-in objects.
704 ifeq ($(MAKECMDGOALS),modules) 642 ifeq ($(MAKECMDGOALS),modules)
705 KBUILD_BUILTIN := 643 KBUILD_BUILTIN :=
706 endif 644 endif
707 645
708 # If we have "make <whatever> modules", compil 646 # If we have "make <whatever> modules", compile modules
709 # in addition to whatever we do anyway. 647 # in addition to whatever we do anyway.
710 # Just "make" or "make all" shall build module 648 # Just "make" or "make all" shall build modules as well
711 649
712 ifneq ($(filter all modules nsdeps %compile_co 650 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
713 KBUILD_MODULES := 1 651 KBUILD_MODULES := 1
714 endif 652 endif
715 653
716 ifeq ($(MAKECMDGOALS),) 654 ifeq ($(MAKECMDGOALS),)
717 KBUILD_MODULES := 1 655 KBUILD_MODULES := 1
718 endif 656 endif
719 657
720 export KBUILD_MODULES KBUILD_BUILTIN 658 export KBUILD_MODULES KBUILD_BUILTIN
721 659
722 ifdef need-config 660 ifdef need-config
723 include include/config/auto.conf 661 include include/config/auto.conf
724 endif 662 endif
725 663
726 ifeq ($(KBUILD_EXTMOD),) 664 ifeq ($(KBUILD_EXTMOD),)
727 # Objects we will link into vmlinux / subdirs 665 # Objects we will link into vmlinux / subdirs we need to visit
728 core-y := !! 666 core-y := init/ usr/ arch/$(SRCARCH)/
729 drivers-y := !! 667 drivers-y := drivers/ sound/
>> 668 drivers-$(CONFIG_SAMPLES) += samples/
>> 669 drivers-$(CONFIG_NET) += net/
>> 670 drivers-y += virt/
730 libs-y := lib/ 671 libs-y := lib/
731 endif # KBUILD_EXTMOD 672 endif # KBUILD_EXTMOD
732 673
733 # The all: target is the default when no targe 674 # The all: target is the default when no target is given on the
734 # command line. 675 # command line.
735 # This allow a user to issue only 'make' to bu 676 # This allow a user to issue only 'make' to build a kernel including modules
736 # Defaults to vmlinux, but the arch makefile u 677 # Defaults to vmlinux, but the arch makefile usually adds further targets
737 all: vmlinux 678 all: vmlinux
738 679
739 CFLAGS_GCOV := -fprofile-arcs -ftest-cover 680 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage
740 ifdef CONFIG_CC_IS_GCC 681 ifdef CONFIG_CC_IS_GCC
741 CFLAGS_GCOV += -fno-tree-loop-im 682 CFLAGS_GCOV += -fno-tree-loop-im
742 endif 683 endif
743 export CFLAGS_GCOV 684 export CFLAGS_GCOV
744 685
745 # The arch Makefiles can override CC_FLAGS_FTR 686 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
746 ifdef CONFIG_FUNCTION_TRACER 687 ifdef CONFIG_FUNCTION_TRACER
747 CC_FLAGS_FTRACE := -pg 688 CC_FLAGS_FTRACE := -pg
748 endif 689 endif
749 690
>> 691 ifdef CONFIG_CC_IS_GCC
>> 692 RETPOLINE_CFLAGS := $(call cc-option,-mindirect-branch=thunk-extern -mindirect-branch-register)
>> 693 RETPOLINE_VDSO_CFLAGS := $(call cc-option,-mindirect-branch=thunk-inline -mindirect-branch-register)
>> 694 endif
>> 695 ifdef CONFIG_CC_IS_CLANG
>> 696 RETPOLINE_CFLAGS := -mretpoline-external-thunk
>> 697 RETPOLINE_VDSO_CFLAGS := -mretpoline
>> 698 endif
>> 699 export RETPOLINE_CFLAGS
>> 700 export RETPOLINE_VDSO_CFLAGS
>> 701
750 include $(srctree)/arch/$(SRCARCH)/Makefile 702 include $(srctree)/arch/$(SRCARCH)/Makefile
751 703
752 ifdef need-config 704 ifdef need-config
753 ifdef may-sync-config 705 ifdef may-sync-config
754 # Read in dependencies to all Kconfig* files, 706 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
755 # changes are detected. This should be include 707 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
756 # because some architectures define CROSS_COMP 708 # because some architectures define CROSS_COMPILE there.
757 include include/config/auto.conf.cmd 709 include include/config/auto.conf.cmd
758 710
759 $(KCONFIG_CONFIG): 711 $(KCONFIG_CONFIG):
760 @echo >&2 '***' 712 @echo >&2 '***'
761 @echo >&2 '*** Configuration file "$@" 713 @echo >&2 '*** Configuration file "$@" not found!'
762 @echo >&2 '***' 714 @echo >&2 '***'
763 @echo >&2 '*** Please run some configu 715 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
764 @echo >&2 '*** "make menuconfig" or "m 716 @echo >&2 '*** "make menuconfig" or "make xconfig").'
765 @echo >&2 '***' 717 @echo >&2 '***'
766 @/bin/false 718 @/bin/false
767 719
768 # The actual configuration files used during t 720 # The actual configuration files used during the build are stored in
769 # include/generated/ and include/config/. Upda 721 # include/generated/ and include/config/. Update them if .config is newer than
770 # include/config/auto.conf (which mirrors .con 722 # include/config/auto.conf (which mirrors .config).
771 # 723 #
772 # This exploits the 'multi-target pattern rule 724 # This exploits the 'multi-target pattern rule' trick.
773 # The syncconfig should be executed only once 725 # The syncconfig should be executed only once to make all the targets.
774 # (Note: use the grouped target '&:' when we b 726 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
775 # 727 #
776 # Do not use $(call cmd,...) here. That would 728 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
777 # so you cannot notice that Kconfig is waiting 729 # so you cannot notice that Kconfig is waiting for the user input.
778 %/config/auto.conf %/config/auto.conf.cmd %/ge !! 730 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
779 $(Q)$(kecho) " SYNC $@" 731 $(Q)$(kecho) " SYNC $@"
780 $(Q)$(MAKE) -f $(srctree)/Makefile syn 732 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
781 else # !may-sync-config 733 else # !may-sync-config
782 # External modules and some install targets ne 734 # External modules and some install targets need include/generated/autoconf.h
783 # and include/config/auto.conf but do not care 735 # and include/config/auto.conf but do not care if they are up-to-date.
784 # Use auto.conf to trigger the test 736 # Use auto.conf to trigger the test
785 PHONY += include/config/auto.conf 737 PHONY += include/config/auto.conf
786 738
787 include/config/auto.conf: 739 include/config/auto.conf:
788 @test -e include/generated/autoconf.h !! 740 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
789 echo >&2; 741 echo >&2; \
790 echo >&2 " ERROR: Kernel configuratio 742 echo >&2 " ERROR: Kernel configuration is invalid."; \
791 echo >&2 " include/generated/a 743 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
792 echo >&2 " Run 'make oldconfig 744 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
793 echo >&2 ; 745 echo >&2 ; \
794 /bin/false) 746 /bin/false)
795 747
796 endif # may-sync-config 748 endif # may-sync-config
797 endif # need-config 749 endif # need-config
798 750
799 KBUILD_CFLAGS += -fno-delete-null-pointer-ch 751 KBUILD_CFLAGS += -fno-delete-null-pointer-checks
>> 752 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
>> 753 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
>> 754 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
>> 755 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
800 756
801 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 757 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
802 KBUILD_CFLAGS += -O2 758 KBUILD_CFLAGS += -O2
803 KBUILD_RUSTFLAGS += -Copt-level=2 !! 759 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
>> 760 KBUILD_CFLAGS += -O3
804 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 761 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
805 KBUILD_CFLAGS += -Os 762 KBUILD_CFLAGS += -Os
806 KBUILD_RUSTFLAGS += -Copt-level=s <<
807 endif 763 endif
808 764
809 # Always set `debug-assertions` and `overflow- <<
810 # depends on `opt-level` and `debug-assertions <<
811 KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $( <<
812 KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(C <<
813 <<
814 # Tell gcc to never replace conditional load w 765 # Tell gcc to never replace conditional load with a non-conditional one
815 ifdef CONFIG_CC_IS_GCC 766 ifdef CONFIG_CC_IS_GCC
816 # gcc-10 renamed --param=allow-store-data-race 767 # gcc-10 renamed --param=allow-store-data-races=0 to
817 # -fno-allow-store-data-races. 768 # -fno-allow-store-data-races.
818 KBUILD_CFLAGS += $(call cc-option,--param=al 769 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
819 KBUILD_CFLAGS += $(call cc-option,-fno-allow 770 KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
820 endif 771 endif
821 772
822 ifdef CONFIG_READABLE_ASM 773 ifdef CONFIG_READABLE_ASM
823 # Disable optimizations that make assembler li 774 # Disable optimizations that make assembler listings hard to read.
824 # reorder blocks reorders the control in the f 775 # reorder blocks reorders the control in the function
825 # ipa clone creates specialized cloned functio 776 # ipa clone creates specialized cloned functions
826 # partial inlining inlines only parts of funct 777 # partial inlining inlines only parts of functions
827 KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa- 778 KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining
828 endif 779 endif
829 780
>> 781 ifneq ($(CONFIG_FRAME_WARN),0)
>> 782 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
>> 783 endif
>> 784
830 stackp-flags-y 785 stackp-flags-y := -fno-stack-protector
831 stackp-flags-$(CONFIG_STACKPROTECTOR) 786 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
832 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) 787 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
833 788
834 KBUILD_CFLAGS += $(stackp-flags-y) 789 KBUILD_CFLAGS += $(stackp-flags-y)
835 790
836 KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarning !! 791 KBUILD_CFLAGS-$(CONFIG_WERROR) += -Werror
837 KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) !! 792 KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH:"%"=%)
>> 793
>> 794 ifdef CONFIG_CC_IS_CLANG
>> 795 KBUILD_CPPFLAGS += -Qunused-arguments
>> 796 # The kernel builds with '-std=gnu89' so use of GNU extensions is acceptable.
>> 797 KBUILD_CFLAGS += -Wno-gnu
>> 798 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
>> 799 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
>> 800 # See modpost pattern 2
>> 801 KBUILD_CFLAGS += -mno-global-merge
>> 802 else
>> 803
>> 804 # gcc inanely warns about local variables called 'main'
>> 805 KBUILD_CFLAGS += -Wno-main
>> 806 endif
>> 807
>> 808 # These warnings generated too much noise in a regular build.
>> 809 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
>> 810 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
>> 811 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
838 812
839 ifdef CONFIG_FRAME_POINTER 813 ifdef CONFIG_FRAME_POINTER
840 KBUILD_CFLAGS += -fno-omit-frame-pointer -fn 814 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
841 KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y <<
842 else 815 else
843 # Some targets (ARM with Thumb2, for example), 816 # Some targets (ARM with Thumb2, for example), can't be built with frame
844 # pointers. For those, we don't have FUNCTION 817 # pointers. For those, we don't have FUNCTION_TRACER automatically
845 # select FRAME_POINTER. However, FUNCTION_TRA 818 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
846 # incompatible with -fomit-frame-pointer with 819 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
847 # -fomit-frame-pointer with FUNCTION_TRACER. 820 # -fomit-frame-pointer with FUNCTION_TRACER.
848 # In the Rust target specification, "frame-poi <<
849 # to "may-omit". <<
850 ifndef CONFIG_FUNCTION_TRACER 821 ifndef CONFIG_FUNCTION_TRACER
851 KBUILD_CFLAGS += -fomit-frame-pointer 822 KBUILD_CFLAGS += -fomit-frame-pointer
852 endif 823 endif
853 endif 824 endif
854 825
855 # Initialize all stack variables with a 0xAA p 826 # Initialize all stack variables with a 0xAA pattern.
856 ifdef CONFIG_INIT_STACK_ALL_PATTERN 827 ifdef CONFIG_INIT_STACK_ALL_PATTERN
857 KBUILD_CFLAGS += -ftrivial-auto-var-init=pat 828 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
858 endif 829 endif
859 830
860 # Initialize all stack variables with a zero v 831 # Initialize all stack variables with a zero value.
861 ifdef CONFIG_INIT_STACK_ALL_ZERO 832 ifdef CONFIG_INIT_STACK_ALL_ZERO
862 KBUILD_CFLAGS += -ftrivial-auto-var-init=zer 833 KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
863 ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER !! 834 ifdef CONFIG_CC_IS_CLANG
864 # https://github.com/llvm/llvm-project/issues/ !! 835 # https://bugs.llvm.org/show_bug.cgi?id=45497
865 CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivi !! 836 KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
866 export CC_AUTO_VAR_INIT_ZERO_ENABLER <<
867 KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENA <<
868 endif 837 endif
869 endif 838 endif
870 839
871 # While VLAs have been removed, GCC produces u 840 # While VLAs have been removed, GCC produces unreachable stack probes
872 # for the randomize_kstack_offset feature. Dis 841 # for the randomize_kstack_offset feature. Disable it for all compilers.
873 KBUILD_CFLAGS += $(call cc-option, -fno-stac 842 KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection)
874 843
875 # Clear used registers at func exit (to reduce 844 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
876 ifdef CONFIG_ZERO_CALL_USED_REGS 845 ifdef CONFIG_ZERO_CALL_USED_REGS
877 KBUILD_CFLAGS += -fzero-call-used-regs=used- 846 KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr
878 endif 847 endif
879 848
880 ifdef CONFIG_FUNCTION_TRACER 849 ifdef CONFIG_FUNCTION_TRACER
881 ifdef CONFIG_FTRACE_MCOUNT_USE_CC 850 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
882 CC_FLAGS_FTRACE += -mrecord-mcount 851 CC_FLAGS_FTRACE += -mrecord-mcount
883 ifdef CONFIG_HAVE_NOP_MCOUNT 852 ifdef CONFIG_HAVE_NOP_MCOUNT
884 ifeq ($(call cc-option-yn, -mnop-mcount),y 853 ifeq ($(call cc-option-yn, -mnop-mcount),y)
885 CC_FLAGS_FTRACE += -mnop-mcount 854 CC_FLAGS_FTRACE += -mnop-mcount
886 CC_FLAGS_USING += -DCC_USING_NOP_MCOU 855 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
887 endif 856 endif
888 endif 857 endif
889 endif 858 endif
890 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 859 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
891 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT !! 860 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
892 CC_FLAGS_USING += -DCC_USING_NOP_MCOU <<
893 endif <<
894 endif 861 endif
895 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 862 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
896 ifdef CONFIG_HAVE_C_RECORDMCOUNT 863 ifdef CONFIG_HAVE_C_RECORDMCOUNT
897 BUILD_C_RECORDMCOUNT := y 864 BUILD_C_RECORDMCOUNT := y
898 export BUILD_C_RECORDMCOUNT 865 export BUILD_C_RECORDMCOUNT
899 endif 866 endif
900 endif 867 endif
901 ifdef CONFIG_HAVE_FENTRY 868 ifdef CONFIG_HAVE_FENTRY
902 # s390-linux-gnu-gcc did not support -mfentr 869 # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
903 ifeq ($(call cc-option-yn, -mfentry),y) 870 ifeq ($(call cc-option-yn, -mfentry),y)
904 CC_FLAGS_FTRACE += -mfentry 871 CC_FLAGS_FTRACE += -mfentry
905 CC_FLAGS_USING += -DCC_USING_FENTRY 872 CC_FLAGS_USING += -DCC_USING_FENTRY
906 endif 873 endif
907 endif 874 endif
908 export CC_FLAGS_FTRACE 875 export CC_FLAGS_FTRACE
909 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLA 876 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
910 KBUILD_AFLAGS += $(CC_FLAGS_USING) 877 KBUILD_AFLAGS += $(CC_FLAGS_USING)
911 endif 878 endif
912 879
913 # We trigger additional mismatches with less i 880 # We trigger additional mismatches with less inlining
914 ifdef CONFIG_DEBUG_SECTION_MISMATCH 881 ifdef CONFIG_DEBUG_SECTION_MISMATCH
915 KBUILD_CFLAGS += -fno-inline-functions-called- 882 KBUILD_CFLAGS += -fno-inline-functions-called-once
916 endif 883 endif
917 884
918 # `rustc`'s `-Zfunction-sections` applies to d <<
919 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 885 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
920 KBUILD_CFLAGS_KERNEL += -ffunction-sections -f 886 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
921 KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections <<
922 LDFLAGS_vmlinux += --gc-sections 887 LDFLAGS_vmlinux += --gc-sections
923 endif 888 endif
924 889
925 ifdef CONFIG_SHADOW_CALL_STACK 890 ifdef CONFIG_SHADOW_CALL_STACK
926 ifndef CONFIG_DYNAMIC_SCS <<
927 CC_FLAGS_SCS := -fsanitize=shadow-call-stac 891 CC_FLAGS_SCS := -fsanitize=shadow-call-stack
928 KBUILD_CFLAGS += $(CC_FLAGS_SCS) 892 KBUILD_CFLAGS += $(CC_FLAGS_SCS)
929 KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-st <<
930 endif <<
931 export CC_FLAGS_SCS 893 export CC_FLAGS_SCS
932 endif 894 endif
933 895
934 ifdef CONFIG_LTO_CLANG 896 ifdef CONFIG_LTO_CLANG
935 ifdef CONFIG_LTO_CLANG_THIN 897 ifdef CONFIG_LTO_CLANG_THIN
936 CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 898 CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit
>> 899 KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache
937 else 900 else
938 CC_FLAGS_LTO := -flto 901 CC_FLAGS_LTO := -flto
939 endif 902 endif
940 CC_FLAGS_LTO += -fvisibility=hidden 903 CC_FLAGS_LTO += -fvisibility=hidden
941 904
942 # Limit inlining across translation units to r 905 # Limit inlining across translation units to reduce binary size
943 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 906 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
>> 907
>> 908 # Check for frame size exceeding threshold during prolog/epilog insertion
>> 909 # when using lld < 13.0.0.
>> 910 ifneq ($(CONFIG_FRAME_WARN),0)
>> 911 ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0)
>> 912 KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN)
>> 913 endif
>> 914 endif
944 endif 915 endif
945 916
946 ifdef CONFIG_LTO 917 ifdef CONFIG_LTO
947 KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 918 KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO)
948 KBUILD_AFLAGS += -fno-lto 919 KBUILD_AFLAGS += -fno-lto
949 export CC_FLAGS_LTO 920 export CC_FLAGS_LTO
950 endif 921 endif
951 922
952 ifdef CONFIG_CFI_CLANG 923 ifdef CONFIG_CFI_CLANG
953 CC_FLAGS_CFI := -fsanitize=kcfi !! 924 CC_FLAGS_CFI := -fsanitize=cfi \
954 ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS !! 925 -fsanitize-cfi-cross-dso \
955 CC_FLAGS_CFI += -fsanitize-cfi-ical !! 926 -fno-sanitize-cfi-canonical-jump-tables \
956 endif !! 927 -fno-sanitize-trap=cfi \
957 ifdef CONFIG_RUST !! 928 -fno-sanitize-blacklist
958 # Always pass -Zsanitizer-cfi-normaliz !! 929
959 # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS. !! 930 ifdef CONFIG_CFI_PERMISSIVE
960 RUSTC_FLAGS_CFI := -Zsanitizer=kcfi !! 931 CC_FLAGS_CFI += -fsanitize-recover=cfi
961 KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI) <<
962 export RUSTC_FLAGS_CFI <<
963 endif 932 endif
>> 933
>> 934 # If LTO flags are filtered out, we must also filter out CFI.
>> 935 CC_FLAGS_LTO += $(CC_FLAGS_CFI)
964 KBUILD_CFLAGS += $(CC_FLAGS_CFI) 936 KBUILD_CFLAGS += $(CC_FLAGS_CFI)
965 export CC_FLAGS_CFI 937 export CC_FLAGS_CFI
966 endif 938 endif
967 939
968 # Architectures can define flags to add/remove !! 940 ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B
969 CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UN !! 941 KBUILD_CFLAGS += -falign-functions=64
970 export CC_FLAGS_FPU <<
971 export CC_FLAGS_NO_FPU <<
972 <<
973 ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) <<
974 # Set the minimal function alignment. Use the <<
975 # -fmin-function-alignment if it is available, <<
976 # See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNME <<
977 ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT <<
978 KBUILD_CFLAGS += -fmin-function-alignment=$(CO <<
979 else <<
980 KBUILD_CFLAGS += -falign-functions=$(CONFIG_FU <<
981 endif <<
982 endif 942 endif
983 943
984 # arch Makefile may override CC so keep this a 944 # arch Makefile may override CC so keep this after arch Makefile is included
985 NOSTDINC_FLAGS += -nostdinc 945 NOSTDINC_FLAGS += -nostdinc
986 946
987 # To gain proper coverage for CONFIG_UBSAN_BOU !! 947 # warn about C99 declaration after statement
988 # the kernel uses only C99 flexible arrays for !! 948 KBUILD_CFLAGS += -Wdeclaration-after-statement
989 # arrays. Enforce this for everything that may !! 949
990 # perform bounds checking. !! 950 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
991 KBUILD_CFLAGS += $(call cc-option, -fstrict-fl !! 951 KBUILD_CFLAGS += -Wvla
992 !! 952
993 #Currently, disable -Wstringop-overflow for GC !! 953 # disable pointer signed / unsigned warnings in gcc 4.0
994 KBUILD_CFLAGS-$(CONFIG_CC_NO_STRINGOP_OVERFLOW !! 954 KBUILD_CFLAGS += -Wno-pointer-sign
995 KBUILD_CFLAGS-$(CONFIG_CC_STRINGOP_OVERFLOW) + !! 955
>> 956 # disable stringop warnings in gcc 8+
>> 957 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
>> 958
>> 959 # We'll want to enable this eventually, but it's not going away for 5.7 at least
>> 960 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
>> 961 KBUILD_CFLAGS += -Wno-array-bounds
>> 962 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
>> 963
>> 964 # Another good warning that we'll want to enable eventually
>> 965 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
>> 966
>> 967 # Enabled with W=2, disabled by default as noisy
>> 968 ifdef CONFIG_CC_IS_GCC
>> 969 KBUILD_CFLAGS += -Wno-maybe-uninitialized
>> 970 endif
>> 971
>> 972 ifdef CONFIG_CC_IS_GCC
>> 973 # The allocators already balk at large sizes, so silence the compiler
>> 974 # warnings for bounds checks involving those possible values. While
>> 975 # -Wno-alloc-size-larger-than would normally be used here, earlier versions
>> 976 # of gcc (<9.1) weirdly don't handle the option correctly when _other_
>> 977 # warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX
>> 978 # doesn't work (as it is documented to), silently resolving to "0" prior to
>> 979 # version 9.1 (and producing an error more recently). Numeric values larger
>> 980 # than PTRDIFF_MAX also don't work prior to version 9.1, which are silently
>> 981 # ignored, continuing to default to PTRDIFF_MAX. So, left with no other
>> 982 # choice, we must perform a versioned check to disable this warning.
>> 983 # https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au
>> 984 KBUILD_CFLAGS += $(call cc-ifversion, -ge, 0901, -Wno-alloc-size-larger-than)
>> 985 endif
996 986
997 # disable invalid "can't wrap" optimizations f 987 # disable invalid "can't wrap" optimizations for signed / pointers
998 KBUILD_CFLAGS += -fno-strict-overflow 988 KBUILD_CFLAGS += -fno-strict-overflow
999 989
1000 # Make sure -fstack-check isn't enabled (like 990 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
1001 KBUILD_CFLAGS += -fno-stack-check 991 KBUILD_CFLAGS += -fno-stack-check
1002 992
1003 # conserve stack if available 993 # conserve stack if available
1004 ifdef CONFIG_CC_IS_GCC 994 ifdef CONFIG_CC_IS_GCC
1005 KBUILD_CFLAGS += -fconserve-stack 995 KBUILD_CFLAGS += -fconserve-stack
1006 endif 996 endif
1007 997
>> 998 # Prohibit date/time macros, which would make the build non-deterministic
>> 999 KBUILD_CFLAGS += -Werror=date-time
>> 1000
>> 1001 # enforce correct pointer usage
>> 1002 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
>> 1003
>> 1004 # Require designated initializers for all marked structures
>> 1005 KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
>> 1006
1008 # change __FILE__ to the relative path from t 1007 # change __FILE__ to the relative path from the srctree
1009 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-p 1008 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
1010 1009
1011 # include additional Makefiles when needed 1010 # include additional Makefiles when needed
1012 include-y := scripts/Ma 1011 include-y := scripts/Makefile.extrawarn
1013 include-$(CONFIG_DEBUG_INFO) += scripts/Ma 1012 include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug
1014 include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Ma <<
1015 include-$(CONFIG_KASAN) += scripts/Ma 1013 include-$(CONFIG_KASAN) += scripts/Makefile.kasan
1016 include-$(CONFIG_KCSAN) += scripts/Ma 1014 include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan
1017 include-$(CONFIG_KMSAN) += scripts/Ma <<
1018 include-$(CONFIG_UBSAN) += scripts/Ma 1015 include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan
1019 include-$(CONFIG_KCOV) += scripts/Ma 1016 include-$(CONFIG_KCOV) += scripts/Makefile.kcov
1020 include-$(CONFIG_RANDSTRUCT) += scripts/Ma <<
1021 include-$(CONFIG_GCC_PLUGINS) += scripts/Ma 1017 include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins
1022 1018
1023 include $(addprefix $(srctree)/, $(include-y) 1019 include $(addprefix $(srctree)/, $(include-y))
1024 1020
1025 # scripts/Makefile.gcc-plugins is intentional 1021 # scripts/Makefile.gcc-plugins is intentionally included last.
1026 # Do not add $(call cc-option,...) below this 1022 # Do not add $(call cc-option,...) below this line. When you build the kernel
1027 # from the clean source tree, the GCC plugins 1023 # from the clean source tree, the GCC plugins do not exist at this point.
1028 1024
1029 # Add user supplied CPPFLAGS, AFLAGS, CFLAGS !! 1025 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
1030 KBUILD_CPPFLAGS += $(KCPPFLAGS) 1026 KBUILD_CPPFLAGS += $(KCPPFLAGS)
1031 KBUILD_AFLAGS += $(KAFLAGS) 1027 KBUILD_AFLAGS += $(KAFLAGS)
1032 KBUILD_CFLAGS += $(KCFLAGS) 1028 KBUILD_CFLAGS += $(KCFLAGS)
1033 KBUILD_RUSTFLAGS += $(KRUSTFLAGS) <<
1034 1029
1035 KBUILD_LDFLAGS_MODULE += --build-id=sha1 1030 KBUILD_LDFLAGS_MODULE += --build-id=sha1
1036 LDFLAGS_vmlinux += --build-id=sha1 1031 LDFLAGS_vmlinux += --build-id=sha1
1037 1032
1038 KBUILD_LDFLAGS += -z noexecstack <<
1039 ifeq ($(CONFIG_LD_IS_BFD),y) <<
1040 KBUILD_LDFLAGS += $(call ld-option,--no-warn <<
1041 endif <<
1042 <<
1043 ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1033 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
1044 LDFLAGS_vmlinux += -X !! 1034 LDFLAGS_vmlinux += $(call ld-option, -X,)
1045 endif 1035 endif
1046 1036
1047 ifeq ($(CONFIG_RELR),y) 1037 ifeq ($(CONFIG_RELR),y)
1048 # ld.lld before 15 did not support -z pack-re !! 1038 LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags
1049 LDFLAGS_vmlinux += $(call ld-option,--pack-dy <<
1050 endif 1039 endif
1051 1040
1052 # We never want expected sections to be place 1041 # We never want expected sections to be placed heuristically by the
1053 # linker. All sections should be explicitly n 1042 # linker. All sections should be explicitly named in the linker script.
1054 ifdef CONFIG_LD_ORPHAN_WARN 1043 ifdef CONFIG_LD_ORPHAN_WARN
1055 LDFLAGS_vmlinux += --orphan-handling=$(CONFIG !! 1044 LDFLAGS_vmlinux += --orphan-handling=warn
1056 endif 1045 endif
1057 1046
1058 # Align the bit size of userspace programs wi 1047 # Align the bit size of userspace programs with the kernel
1059 KBUILD_USERCFLAGS += $(filter -m32 -m64 --ta 1048 KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1060 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --ta 1049 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1061 1050
1062 # make the checker run with the right archite 1051 # make the checker run with the right architecture
1063 CHECKFLAGS += --arch=$(ARCH) 1052 CHECKFLAGS += --arch=$(ARCH)
1064 1053
1065 # insure the checker run with the right endia 1054 # insure the checker run with the right endianness
1066 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),- 1055 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1067 1056
1068 # the checker needs the correct machine size 1057 # the checker needs the correct machine size
1069 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1058 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1070 1059
1071 # Default kernel image to build when no speci 1060 # Default kernel image to build when no specific target is given.
1072 # KBUILD_IMAGE may be overruled on the comman 1061 # KBUILD_IMAGE may be overruled on the command line or
1073 # set in the environment 1062 # set in the environment
1074 # Also any assignments in arch/$(ARCH)/Makefi 1063 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1075 # this default value 1064 # this default value
1076 export KBUILD_IMAGE ?= vmlinux 1065 export KBUILD_IMAGE ?= vmlinux
1077 1066
1078 # 1067 #
1079 # INSTALL_PATH specifies where to place the u 1068 # INSTALL_PATH specifies where to place the updated kernel and system map
1080 # images. Default is /boot, but you can set i 1069 # images. Default is /boot, but you can set it to other values
1081 export INSTALL_PATH ?= /boot 1070 export INSTALL_PATH ?= /boot
1082 1071
1083 # 1072 #
1084 # INSTALL_DTBS_PATH specifies a prefix for re 1073 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1085 # Like INSTALL_MOD_PATH, it isn't defined in 1074 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1086 # an argument if needed. Otherwise it default 1075 # an argument if needed. Otherwise it defaults to the kernel install path
1087 # 1076 #
1088 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/d 1077 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1089 1078
1090 # 1079 #
1091 # INSTALL_MOD_PATH specifies a prefix to MODL 1080 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1092 # relocations required by build roots. This 1081 # relocations required by build roots. This is not defined in the
1093 # makefile but the argument can be passed to 1082 # makefile but the argument can be passed to make if needed.
1094 # 1083 #
1095 1084
1096 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(K 1085 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1097 export MODLIB 1086 export MODLIB
1098 1087
1099 PHONY += prepare0 1088 PHONY += prepare0
1100 1089
1101 export extmod_prefix = $(if $(KBUILD_EXTMOD), 1090 export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
1102 export MODORDER := $(extmod_prefix)modules.or 1091 export MODORDER := $(extmod_prefix)modules.order
1103 export MODULES_NSDEPS := $(extmod_prefix)modu 1092 export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps
1104 1093
1105 ifeq ($(KBUILD_EXTMOD),) 1094 ifeq ($(KBUILD_EXTMOD),)
>> 1095 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/
>> 1096 core-$(CONFIG_BLOCK) += block/
>> 1097
>> 1098 vmlinux-dirs := $(patsubst %/,%,$(filter %/, \
>> 1099 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
>> 1100 $(libs-y) $(libs-m)))
1106 1101
1107 build-dir := . !! 1102 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1108 clean-dirs := $(sort . Documentation \ <<
1109 $(patsubst %/,%,$(filter 1103 $(patsubst %/,%,$(filter %/, $(core-) \
1110 $(drivers-) $(libs-)) 1104 $(drivers-) $(libs-))))
1111 1105
1112 export ARCH_CORE := $(core-y) !! 1106 subdir-modorder := $(addsuffix modules.order,$(filter %/, \
1113 export ARCH_LIB := $(filter %/, $(lib !! 1107 $(core-y) $(core-m) $(libs-y) $(libs-m) \
1114 export ARCH_DRIVERS := $(drivers-y) $(dri !! 1108 $(drivers-y) $(drivers-m)))
1115 # Externally visible symbols (used by link-vm !! 1109
>> 1110 build-dirs := $(vmlinux-dirs)
>> 1111 clean-dirs := $(vmlinux-alldirs)
1116 1112
1117 KBUILD_VMLINUX_OBJS := ./built-in.a !! 1113 # Externally visible symbols (used by link-vmlinux.sh)
>> 1114 KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y))
>> 1115 KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
1118 ifdef CONFIG_MODULES 1116 ifdef CONFIG_MODULES
1119 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a 1117 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1120 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(lib 1118 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1121 else 1119 else
1122 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, 1120 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1123 endif 1121 endif
>> 1122 KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
1124 1123
1125 export KBUILD_VMLINUX_LIBS !! 1124 export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1126 export KBUILD_LDS := arch/$(SRCARCH) 1125 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
>> 1126 # used by scripts/Makefile.package
>> 1127 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
>> 1128
>> 1129 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1127 1130
>> 1131 # Recurse until adjust_autoksyms.sh is satisfied
>> 1132 PHONY += autoksyms_recursive
1128 ifdef CONFIG_TRIM_UNUSED_KSYMS 1133 ifdef CONFIG_TRIM_UNUSED_KSYMS
1129 # For the kernel to actually contain only the 1134 # For the kernel to actually contain only the needed exported symbols,
1130 # we have to build modules as well to determi 1135 # we have to build modules as well to determine what those symbols are.
>> 1136 # (this can be evaluated only once include/config/auto.conf has been included)
1131 KBUILD_MODULES := 1 1137 KBUILD_MODULES := 1
>> 1138
>> 1139 autoksyms_recursive: descend modules.order
>> 1140 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
>> 1141 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1132 endif 1142 endif
1133 1143
1134 # '$(AR) mPi' needs 'T' to workaround the bug !! 1144 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1135 quiet_cmd_ar_vmlinux.a = AR $@ <<
1136 cmd_ar_vmlinux.a = \ <<
1137 rm -f $@; \ <<
1138 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS <<
1139 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) <<
1140 <<
1141 targets += vmlinux.a <<
1142 vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/hea <<
1143 $(call if_changed,ar_vmlinux.a) <<
1144 <<
1145 PHONY += vmlinux_o <<
1146 vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) <<
1147 $(Q)$(MAKE) -f $(srctree)/scripts/Mak <<
1148 1145
1149 vmlinux.o modules.builtin.modinfo modules.bui !! 1146 quiet_cmd_autoksyms_h = GEN $@
1150 @: !! 1147 cmd_autoksyms_h = mkdir -p $(dir $@); \
>> 1148 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
>> 1149
>> 1150 $(autoksyms_h):
>> 1151 $(call cmd,autoksyms_h)
1151 1152
1152 PHONY += vmlinux !! 1153 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1153 # LDFLAGS_vmlinux in the top Makefile defines !! 1154
1154 # not for decompressors. LDFLAGS_vmlinux in a !! 1155 # Final link of vmlinux with optional arch pass after final link
1155 # unrelated; the decompressors just happen to !! 1156 cmd_link-vmlinux = \
1156 # arch/*/boot/compressed/vmlinux. !! 1157 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \
1157 # Export LDFLAGS_vmlinux only to scripts/Make !! 1158 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1158 # !! 1159
1159 # _LDFLAGS_vmlinux is a workaround for the 'p !! 1160 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1160 # https://savannah.gnu.org/bugs/?61463 !! 1161 +$(call if_changed_dep,link-vmlinux)
1161 # For Make > 4.4, the following simple code w !! 1162
1162 # vmlinux: private export LDFLAGS_vmlinux := !! 1163 targets := vmlinux
1163 vmlinux: private _LDFLAGS_vmlinux := $(LDFLAG <<
1164 vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_ <<
1165 vmlinux: vmlinux.o $(KBUILD_LDS) modpost <<
1166 $(Q)$(MAKE) -f $(srctree)/scripts/Mak <<
1167 1164
1168 # The actual objects are generated when desce 1165 # The actual objects are generated when descending,
1169 # make sure no implicit rule kicks in 1166 # make sure no implicit rule kicks in
1170 $(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $ !! 1167 $(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
1171 1168
1172 ifeq ($(origin KERNELRELEASE),file) !! 1169 filechk_kernel.release = \
1173 filechk_kernel.release = $(srctree)/scripts/s !! 1170 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1174 else <<
1175 filechk_kernel.release = echo $(KERNELRELEASE <<
1176 endif <<
1177 1171
1178 # Store (new) KERNELRELEASE string in include 1172 # Store (new) KERNELRELEASE string in include/config/kernel.release
1179 include/config/kernel.release: FORCE 1173 include/config/kernel.release: FORCE
1180 $(call filechk,kernel.release) 1174 $(call filechk,kernel.release)
1181 1175
1182 # Additional helpers built in scripts/ 1176 # Additional helpers built in scripts/
1183 # Carefully list dependencies so we do not tr 1177 # Carefully list dependencies so we do not try to build scripts twice
1184 # in parallel 1178 # in parallel
1185 PHONY += scripts 1179 PHONY += scripts
1186 scripts: scripts_basic scripts_dtc 1180 scripts: scripts_basic scripts_dtc
1187 $(Q)$(MAKE) $(build)=$(@) 1181 $(Q)$(MAKE) $(build)=$(@)
1188 1182
1189 # Things we need to do before we recursively 1183 # Things we need to do before we recursively start building the kernel
1190 # or the modules are listed in "prepare". 1184 # or the modules are listed in "prepare".
1191 # A multi level approach is used. prepareN is 1185 # A multi level approach is used. prepareN is processed before prepareN-1.
1192 # archprepare is used in arch Makefiles and w 1186 # archprepare is used in arch Makefiles and when processed asm symlink,
1193 # version.h and scripts_basic is processed / 1187 # version.h and scripts_basic is processed / created.
1194 1188
1195 PHONY += prepare archprepare 1189 PHONY += prepare archprepare
1196 1190
1197 archprepare: outputmakefile archheaders archs 1191 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1198 asm-generic $(version_h) include/gene !! 1192 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1199 include/generated/compile.h include/g !! 1193 include/generated/autoconf.h remove-stale-files
1200 1194
1201 prepare0: archprepare 1195 prepare0: archprepare
1202 $(Q)$(MAKE) $(build)=scripts/mod 1196 $(Q)$(MAKE) $(build)=scripts/mod
1203 $(Q)$(MAKE) $(build)=. prepare !! 1197 $(Q)$(MAKE) $(build)=.
1204 1198
1205 # All the preparing.. 1199 # All the preparing..
1206 prepare: prepare0 1200 prepare: prepare0
1207 ifdef CONFIG_RUST <<
1208 +$(Q)$(CONFIG_SHELL) $(srctree)/scrip <<
1209 $(Q)$(MAKE) $(build)=rust <<
1210 endif <<
1211 1201
1212 PHONY += remove-stale-files 1202 PHONY += remove-stale-files
1213 remove-stale-files: 1203 remove-stale-files:
1214 $(Q)$(srctree)/scripts/remove-stale-f 1204 $(Q)$(srctree)/scripts/remove-stale-files
1215 1205
1216 # Support for using generic headers in asm-ge 1206 # Support for using generic headers in asm-generic
1217 asm-generic := -f $(srctree)/scripts/Makefile !! 1207 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1218 1208
1219 PHONY += asm-generic uapi-asm-generic 1209 PHONY += asm-generic uapi-asm-generic
1220 asm-generic: uapi-asm-generic 1210 asm-generic: uapi-asm-generic
1221 $(Q)$(MAKE) $(asm-generic)=arch/$(SRC 1211 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1222 generic=include/asm-generic 1212 generic=include/asm-generic
1223 uapi-asm-generic: 1213 uapi-asm-generic:
1224 $(Q)$(MAKE) $(asm-generic)=arch/$(SRC 1214 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1225 generic=include/uapi/asm-generic 1215 generic=include/uapi/asm-generic
1226 1216
1227 # Generate some files 1217 # Generate some files
1228 # ------------------------------------------- 1218 # ---------------------------------------------------------------------------
1229 1219
1230 # KERNELRELEASE can change from a few differe 1220 # KERNELRELEASE can change from a few different places, meaning version.h
1231 # needs to be updated, so this check is force 1221 # needs to be updated, so this check is forced on all builds
1232 1222
1233 uts_len := 64 1223 uts_len := 64
1234 define filechk_utsrelease.h 1224 define filechk_utsrelease.h
1235 if [ `echo -n "$(KERNELRELEASE)" | wc 1225 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1236 echo '"$(KERNELRELEASE)" exceeds $( 1226 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1237 exit 1; 1227 exit 1; \
1238 fi; 1228 fi; \
1239 echo \#define UTS_RELEASE \"$(KERNELR 1229 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1240 endef 1230 endef
1241 1231
1242 define filechk_version.h 1232 define filechk_version.h
1243 if [ $(SUBLEVEL) -gt 255 ]; then 1233 if [ $(SUBLEVEL) -gt 255 ]; then \
1244 echo \#define LINUX_VERSION_C 1234 echo \#define LINUX_VERSION_CODE $(shell \
1245 expr $(VERSION) \* 65536 + $( 1235 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1246 else 1236 else \
1247 echo \#define LINUX_VERSION_C 1237 echo \#define LINUX_VERSION_CODE $(shell \
1248 expr $(VERSION) \* 65536 + $( 1238 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1249 fi; 1239 fi; \
1250 echo '#define KERNEL_VERSION(a,b,c) ( 1240 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1251 ((c) > 255 ? 255 : (c)))'; 1241 ((c) > 255 ? 255 : (c)))'; \
1252 echo \#define LINUX_VERSION_MAJOR $(V 1242 echo \#define LINUX_VERSION_MAJOR $(VERSION); \
1253 echo \#define LINUX_VERSION_PATCHLEVE 1243 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1254 echo \#define LINUX_VERSION_SUBLEVEL 1244 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1255 endef 1245 endef
1256 1246
1257 $(version_h): private PATCHLEVEL := $(or $(PA !! 1247 $(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0)
1258 $(version_h): private SUBLEVEL := $(or $(SUBL !! 1248 $(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0)
1259 $(version_h): FORCE 1249 $(version_h): FORCE
1260 $(call filechk,version.h) 1250 $(call filechk,version.h)
1261 1251
1262 include/generated/utsrelease.h: include/confi 1252 include/generated/utsrelease.h: include/config/kernel.release FORCE
1263 $(call filechk,utsrelease.h) 1253 $(call filechk,utsrelease.h)
1264 1254
1265 filechk_compile.h = $(srctree)/scripts/mkcomp <<
1266 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION <<
1267 <<
1268 include/generated/compile.h: FORCE <<
1269 $(call filechk,compile.h) <<
1270 <<
1271 PHONY += headerdep 1255 PHONY += headerdep
1272 headerdep: 1256 headerdep:
1273 $(Q)find $(srctree)/include/ -name '* 1257 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1274 $(srctree)/scripts/headerdep.pl -I$(s 1258 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1275 1259
1276 # ------------------------------------------- 1260 # ---------------------------------------------------------------------------
1277 # Kernel headers 1261 # Kernel headers
1278 1262
1279 #Default location for installed headers 1263 #Default location for installed headers
1280 export INSTALL_HDR_PATH = $(objtree)/usr 1264 export INSTALL_HDR_PATH = $(objtree)/usr
1281 1265
1282 quiet_cmd_headers_install = INSTALL $(INSTALL 1266 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1283 cmd_headers_install = \ 1267 cmd_headers_install = \
1284 mkdir -p $(INSTALL_HDR_PATH); \ 1268 mkdir -p $(INSTALL_HDR_PATH); \
1285 rsync -mrl --include='*/' --include=' 1269 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1286 usr/include $(INSTALL_HDR_PATH) 1270 usr/include $(INSTALL_HDR_PATH)
1287 1271
1288 PHONY += headers_install 1272 PHONY += headers_install
1289 headers_install: headers 1273 headers_install: headers
1290 $(call cmd,headers_install) 1274 $(call cmd,headers_install)
1291 1275
1292 PHONY += archheaders archscripts 1276 PHONY += archheaders archscripts
1293 1277
1294 hdr-inst := -f $(srctree)/scripts/Makefile.he 1278 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1295 1279
1296 PHONY += headers 1280 PHONY += headers
1297 headers: $(version_h) scripts_unifdef uapi-as 1281 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1298 $(if $(filter um, $(SRCARCH)), $(erro !! 1282 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
>> 1283 $(error Headers not exportable for the $(SRCARCH) architecture))
1299 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1284 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1300 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARC 1285 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1301 1286
>> 1287 # Deprecated. It is no-op now.
>> 1288 PHONY += headers_check
>> 1289 headers_check:
>> 1290 @echo >&2 "=================== WARNING ==================="
>> 1291 @echo >&2 "Since Linux 5.5, 'make headers_check' is no-op,"
>> 1292 @echo >&2 "and will be removed after Linux 5.15 release."
>> 1293 @echo >&2 "Please remove headers_check from your scripts."
>> 1294 @echo >&2 "==============================================="
>> 1295
1302 ifdef CONFIG_HEADERS_INSTALL 1296 ifdef CONFIG_HEADERS_INSTALL
1303 prepare: headers 1297 prepare: headers
1304 endif 1298 endif
1305 1299
1306 PHONY += scripts_unifdef 1300 PHONY += scripts_unifdef
1307 scripts_unifdef: scripts_basic 1301 scripts_unifdef: scripts_basic
1308 $(Q)$(MAKE) $(build)=scripts scripts/ 1302 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1309 1303
1310 # ------------------------------------------- 1304 # ---------------------------------------------------------------------------
1311 # Install 1305 # Install
1312 1306
1313 # Many distributions have the custom install 1307 # Many distributions have the custom install script, /sbin/installkernel.
1314 # If DKMS is installed, 'make install' will e !! 1308 # If DKMS is installed, 'make install' will eventually recuses back
1315 # to this Makefile to build and install exter !! 1309 # to the this Makefile to build and install external modules.
1316 # Cancel sub_make_done so that options such a 1310 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1317 1311
1318 quiet_cmd_install = INSTALL $(INSTALL_PATH) !! 1312 install: sub_make_done :=
1319 cmd_install = unset sub_make_done; $(sr <<
1320 <<
1321 # ------------------------------------------- <<
1322 # vDSO install <<
1323 <<
1324 PHONY += vdso_install <<
1325 vdso_install: export INSTALL_FILES = $(vdso-i <<
1326 vdso_install: <<
1327 $(Q)$(MAKE) -f $(srctree)/scripts/Mak <<
1328 1313
1329 # ------------------------------------------- 1314 # ---------------------------------------------------------------------------
1330 # Tools 1315 # Tools
1331 1316
1332 ifdef CONFIG_OBJTOOL !! 1317 ifdef CONFIG_STACK_VALIDATION
1333 prepare: tools/objtool 1318 prepare: tools/objtool
1334 endif 1319 endif
1335 1320
1336 ifdef CONFIG_BPF 1321 ifdef CONFIG_BPF
1337 ifdef CONFIG_DEBUG_INFO_BTF 1322 ifdef CONFIG_DEBUG_INFO_BTF
1338 prepare: tools/bpf/resolve_btfids 1323 prepare: tools/bpf/resolve_btfids
1339 endif 1324 endif
1340 endif 1325 endif
1341 1326
1342 # The tools build system is not a part of Kbu <<
1343 # its own unique issues. If you need to integ <<
1344 # please consider locating that tool outside <<
1345 # standard Kbuild "hostprogs" syntax instead <<
1346 # here. See Documentation/kbuild/makefiles.rs <<
1347 <<
1348 PHONY += resolve_btfids_clean 1327 PHONY += resolve_btfids_clean
1349 1328
1350 resolve_btfids_O = $(abspath $(objtree))/tool 1329 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1351 1330
1352 # tools/bpf/resolve_btfids directory might no 1331 # tools/bpf/resolve_btfids directory might not exist
1353 # in output directory, skip its clean in that 1332 # in output directory, skip its clean in that case
1354 resolve_btfids_clean: 1333 resolve_btfids_clean:
1355 ifneq ($(wildcard $(resolve_btfids_O)),) 1334 ifneq ($(wildcard $(resolve_btfids_O)),)
1356 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/ 1335 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1357 endif 1336 endif
1358 1337
1359 # Clear a bunch of variables before executing 1338 # Clear a bunch of variables before executing the submake
1360 ifeq ($(quiet),silent_) 1339 ifeq ($(quiet),silent_)
1361 tools_silent=s 1340 tools_silent=s
1362 endif 1341 endif
1363 1342
1364 tools/: FORCE 1343 tools/: FORCE
1365 $(Q)mkdir -p $(objtree)/tools 1344 $(Q)mkdir -p $(objtree)/tools
1366 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(too 1345 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1367 1346
1368 tools/%: FORCE 1347 tools/%: FORCE
1369 $(Q)mkdir -p $(objtree)/tools 1348 $(Q)mkdir -p $(objtree)/tools
1370 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(too 1349 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1371 1350
1372 # ------------------------------------------- 1351 # ---------------------------------------------------------------------------
1373 # Kernel selftest 1352 # Kernel selftest
1374 1353
1375 PHONY += kselftest 1354 PHONY += kselftest
1376 kselftest: headers !! 1355 kselftest:
1377 $(Q)$(MAKE) -C $(srctree)/tools/testi 1356 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1378 1357
1379 kselftest-%: headers FORCE !! 1358 kselftest-%: FORCE
1380 $(Q)$(MAKE) -C $(srctree)/tools/testi 1359 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1381 1360
1382 PHONY += kselftest-merge 1361 PHONY += kselftest-merge
1383 kselftest-merge: 1362 kselftest-merge:
1384 $(if $(wildcard $(objtree)/.config),, 1363 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1385 $(Q)find $(srctree)/tools/testing/sel !! 1364 $(Q)find $(srctree)/tools/testing/selftests -name config | \
1386 xargs $(srctree)/scripts/kcon !! 1365 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1387 $(Q)$(MAKE) -f $(srctree)/Makefile ol 1366 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1388 1367
1389 # ------------------------------------------- 1368 # ---------------------------------------------------------------------------
1390 # Devicetree files 1369 # Devicetree files
1391 1370
1392 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/ 1371 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1393 dtstree := arch/$(SRCARCH)/boot/dts 1372 dtstree := arch/$(SRCARCH)/boot/dts
1394 endif 1373 endif
1395 1374
1396 ifneq ($(dtstree),) 1375 ifneq ($(dtstree),)
1397 1376
1398 %.dtb: dtbs_prepare !! 1377 %.dtb: include/config/kernel.release scripts_dtc
1399 $(Q)$(MAKE) $(build)=$(dtstree) $(dts 1378 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1400 1379
1401 %.dtbo: dtbs_prepare !! 1380 %.dtbo: include/config/kernel.release scripts_dtc
1402 $(Q)$(MAKE) $(build)=$(dtstree) $(dts 1381 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1403 1382
1404 PHONY += dtbs dtbs_prepare dtbs_install dtbs_ !! 1383 PHONY += dtbs dtbs_install dtbs_check
1405 dtbs: dtbs_prepare !! 1384 dtbs: include/config/kernel.release scripts_dtc
1406 $(Q)$(MAKE) $(build)=$(dtstree) need- !! 1385 $(Q)$(MAKE) $(build)=$(dtstree)
1407 <<
1408 # include/config/kernel.release is actually n <<
1409 # INSTALL_DTBS_PATH contains $(KERNELRELEASE) <<
1410 # dtbs_install depend on it as dtbs_install m <<
1411 dtbs_prepare: include/config/kernel.release s <<
1412 1386
1413 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)), 1387 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1414 export CHECK_DTBS=y 1388 export CHECK_DTBS=y
1415 endif !! 1389 dtbs: dt_binding_check
1416 <<
1417 ifneq ($(CHECK_DTBS),) <<
1418 dtbs_prepare: dt_binding_schemas <<
1419 endif 1390 endif
1420 1391
1421 dtbs_check: dtbs 1392 dtbs_check: dtbs
1422 1393
1423 dtbs_install: 1394 dtbs_install:
1424 $(Q)$(MAKE) -f $(srctree)/scripts/Mak !! 1395 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1425 1396
1426 ifdef CONFIG_OF_EARLY_FLATTREE 1397 ifdef CONFIG_OF_EARLY_FLATTREE
1427 all: dtbs 1398 all: dtbs
1428 endif 1399 endif
1429 1400
1430 endif 1401 endif
1431 1402
1432 PHONY += scripts_dtc 1403 PHONY += scripts_dtc
1433 scripts_dtc: scripts_basic 1404 scripts_dtc: scripts_basic
1434 $(Q)$(MAKE) $(build)=scripts/dtc 1405 $(Q)$(MAKE) $(build)=scripts/dtc
1435 1406
1436 ifneq ($(filter dt_binding_check, $(MAKECMDGO 1407 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1437 export CHECK_DTBS=y !! 1408 export CHECK_DT_BINDING=y
1438 endif 1409 endif
1439 1410
1440 PHONY += dt_binding_check dt_binding_schemas !! 1411 PHONY += dt_binding_check
1441 dt_binding_check: dt_binding_schemas scripts_ !! 1412 dt_binding_check: scripts_dtc
1442 $(Q)$(MAKE) $(build)=Documentation/de <<
1443 <<
1444 dt_binding_schemas: <<
1445 $(Q)$(MAKE) $(build)=Documentation/de 1413 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1446 1414
1447 PHONY += dt_compatible_check <<
1448 dt_compatible_check: dt_binding_schemas <<
1449 $(Q)$(MAKE) $(build)=Documentation/de <<
1450 <<
1451 # ------------------------------------------- 1415 # ---------------------------------------------------------------------------
1452 # Modules 1416 # Modules
1453 1417
1454 ifdef CONFIG_MODULES 1418 ifdef CONFIG_MODULES
1455 1419
1456 # By default, build modules as well 1420 # By default, build modules as well
1457 1421
1458 all: modules 1422 all: modules
1459 1423
1460 # When we're building modules with modversion 1424 # When we're building modules with modversions, we need to consider
1461 # the built-in objects during the descend as 1425 # the built-in objects during the descend as well, in order to
1462 # make sure the checksums are up to date befo 1426 # make sure the checksums are up to date before we record them.
1463 ifdef CONFIG_MODVERSIONS 1427 ifdef CONFIG_MODVERSIONS
1464 KBUILD_BUILTIN := 1 1428 KBUILD_BUILTIN := 1
1465 endif 1429 endif
1466 1430
1467 # Build modules 1431 # Build modules
1468 # 1432 #
>> 1433 # A module can be listed more than once in obj-m resulting in
>> 1434 # duplicate lines in modules.order files. Those are removed
>> 1435 # using awk while concatenating to the final file.
1469 1436
1470 # *.ko are usually independent of vmlinux, bu !! 1437 PHONY += modules
1471 # is an exception. !! 1438 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare
1472 ifdef CONFIG_DEBUG_INFO_BTF_MODULES <<
1473 KBUILD_BUILTIN := 1 <<
1474 modules: vmlinux <<
1475 endif <<
1476 1439
1477 modules: modules_prepare !! 1440 cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@
>> 1441
>> 1442 modules.order: $(subdir-modorder) FORCE
>> 1443 $(call if_changed,modules_order)
>> 1444
>> 1445 targets += modules.order
1478 1446
1479 # Target to prepare building external modules 1447 # Target to prepare building external modules
>> 1448 PHONY += modules_prepare
1480 modules_prepare: prepare 1449 modules_prepare: prepare
1481 $(Q)$(MAKE) $(build)=scripts scripts/ 1450 $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1482 1451
>> 1452 export modules_sign_only :=
>> 1453
>> 1454 ifeq ($(CONFIG_MODULE_SIG),y)
>> 1455 PHONY += modules_sign
>> 1456 modules_sign: modules_install
>> 1457 @:
>> 1458
>> 1459 # modules_sign is a subset of modules_install.
>> 1460 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
>> 1461 ifeq ($(filter modules_install,$(MAKECMDGOALS)),)
>> 1462 modules_sign_only := y
>> 1463 endif
>> 1464 endif
>> 1465
>> 1466 modinst_pre :=
>> 1467 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
>> 1468 modinst_pre := __modinst_pre
>> 1469 endif
>> 1470
>> 1471 modules_install: $(modinst_pre)
>> 1472 PHONY += __modinst_pre
>> 1473 __modinst_pre:
>> 1474 @rm -rf $(MODLIB)/kernel
>> 1475 @rm -f $(MODLIB)/source
>> 1476 @mkdir -p $(MODLIB)/kernel
>> 1477 @ln -s $(abspath $(srctree)) $(MODLIB)/source
>> 1478 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
>> 1479 rm -f $(MODLIB)/build ; \
>> 1480 ln -s $(CURDIR) $(MODLIB)/build ; \
>> 1481 fi
>> 1482 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
>> 1483 @cp -f modules.builtin $(MODLIB)/
>> 1484 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
>> 1485
1483 endif # CONFIG_MODULES 1486 endif # CONFIG_MODULES
1484 1487
1485 ### 1488 ###
1486 # Cleaning is done on three levels. 1489 # Cleaning is done on three levels.
1487 # make clean Delete most generated files 1490 # make clean Delete most generated files
1488 # Leave enough to build extern 1491 # Leave enough to build external modules
1489 # make mrproper Delete the current configura 1492 # make mrproper Delete the current configuration, and all generated files
1490 # make distclean Remove editor backup files, 1493 # make distclean Remove editor backup files, patch leftover files and the like
1491 1494
1492 # Directories & files removed with 'make clea 1495 # Directories & files removed with 'make clean'
1493 CLEAN_FILES += vmlinux.symvers modules-only.s !! 1496 CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \
1494 modules.builtin modules.builti 1497 modules.builtin modules.builtin.modinfo modules.nsdeps \
1495 modules.builtin.ranges vmlinux !! 1498 compile_commands.json .thinlto-cache
1496 compile_commands.json rust/tes <<
1497 rust-project.json .vmlinux.obj <<
1498 1499
1499 # Directories & files removed with 'make mrpr 1500 # Directories & files removed with 'make mrproper'
1500 MRPROPER_FILES += include/config include/gene 1501 MRPROPER_FILES += include/config include/generated \
1501 arch/$(SRCARCH)/include/gen !! 1502 arch/$(SRCARCH)/include/generated .tmp_objdiff \
1502 debian snap tar-install PKG !! 1503 debian snap tar-install \
1503 .config .config.old .versio 1504 .config .config.old .version \
1504 Module.symvers \ 1505 Module.symvers \
1505 certs/signing_key.pem \ !! 1506 certs/signing_key.pem certs/signing_key.x509 \
1506 certs/x509.genkey \ 1507 certs/x509.genkey \
1507 vmlinux-gdb.py \ 1508 vmlinux-gdb.py \
1508 rpmbuild \ !! 1509 *.spec
1509 rust/libmacros.so <<
1510 1510
1511 # clean - Delete most, but leave enough to bu 1511 # clean - Delete most, but leave enough to build external modules
1512 # 1512 #
1513 clean: private rm-files := $(CLEAN_FILES) !! 1513 clean: rm-files := $(CLEAN_FILES)
1514 1514
1515 PHONY += archclean vmlinuxclean 1515 PHONY += archclean vmlinuxclean
1516 1516
1517 vmlinuxclean: 1517 vmlinuxclean:
1518 $(Q)$(CONFIG_SHELL) $(srctree)/script 1518 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1519 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f 1519 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1520 1520
1521 clean: archclean vmlinuxclean resolve_btfids_ 1521 clean: archclean vmlinuxclean resolve_btfids_clean
1522 1522
1523 # mrproper - Delete all generated files, incl 1523 # mrproper - Delete all generated files, including .config
1524 # 1524 #
1525 mrproper: private rm-files := $(MRPROPER_FILE !! 1525 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1526 mrproper-dirs := $(addprefix _mrproper_, 1526 mrproper-dirs := $(addprefix _mrproper_,scripts)
1527 1527
1528 PHONY += $(mrproper-dirs) mrproper 1528 PHONY += $(mrproper-dirs) mrproper
1529 $(mrproper-dirs): 1529 $(mrproper-dirs):
1530 $(Q)$(MAKE) $(clean)=$(patsubst _mrpr 1530 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1531 1531
1532 mrproper: clean $(mrproper-dirs) 1532 mrproper: clean $(mrproper-dirs)
1533 $(call cmd,rmfiles) 1533 $(call cmd,rmfiles)
1534 @find . $(RCS_FIND_IGNORE) \ <<
1535 \( -name '*.rmeta' \) \ <<
1536 -type f -print | xargs rm -f <<
1537 1534
1538 # distclean 1535 # distclean
1539 # 1536 #
1540 PHONY += distclean 1537 PHONY += distclean
1541 1538
1542 distclean: mrproper 1539 distclean: mrproper
1543 @find . $(RCS_FIND_IGNORE) \ 1540 @find . $(RCS_FIND_IGNORE) \
1544 \( -name '*.orig' -o -name '* 1541 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1545 -o -name '*.bak' -o -name '#* 1542 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1546 -o -name 'core' -o -name tags 1543 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \
1547 -o -name GPATH -o -name GRTAG 1544 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \
1548 -type f -print | xargs rm -f 1545 -type f -print | xargs rm -f
1549 1546
1550 1547
1551 # Packaging of the kernel to various formats 1548 # Packaging of the kernel to various formats
1552 # ------------------------------------------- 1549 # ---------------------------------------------------------------------------
1553 1550
1554 %src-pkg: FORCE 1551 %src-pkg: FORCE
1555 $(Q)$(MAKE) -f $(srctree)/scripts/Mak 1552 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1556 %pkg: include/config/kernel.release FORCE 1553 %pkg: include/config/kernel.release FORCE
1557 $(Q)$(MAKE) -f $(srctree)/scripts/Mak 1554 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1558 1555
1559 # Brief documentation of the typical targets 1556 # Brief documentation of the typical targets used
1560 # ------------------------------------------- 1557 # ---------------------------------------------------------------------------
1561 1558
1562 boards := $(wildcard $(srctree)/arch/$(SRCARC 1559 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1563 boards := $(sort $(notdir $(boards))) 1560 boards := $(sort $(notdir $(boards)))
1564 board-dirs := $(dir $(wildcard $(srctree)/arc 1561 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1565 board-dirs := $(sort $(notdir $(board-dirs:/= 1562 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1566 1563
1567 PHONY += help 1564 PHONY += help
1568 help: 1565 help:
1569 @echo 'Cleaning targets:' 1566 @echo 'Cleaning targets:'
1570 @echo ' clean - Remove mo 1567 @echo ' clean - Remove most generated files but keep the config and'
1571 @echo ' enough bu 1568 @echo ' enough build support to build external modules'
1572 @echo ' mrproper - Remove al 1569 @echo ' mrproper - Remove all generated files + config + various backup files'
1573 @echo ' distclean - mrproper 1570 @echo ' distclean - mrproper + remove editor backup and patch files'
1574 @echo '' 1571 @echo ''
>> 1572 @echo 'Configuration targets:'
1575 @$(MAKE) -f $(srctree)/scripts/kconfi 1573 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1576 @echo '' 1574 @echo ''
1577 @echo 'Other generic targets:' 1575 @echo 'Other generic targets:'
1578 @echo ' all - Build all 1576 @echo ' all - Build all targets marked with [*]'
1579 @echo '* vmlinux - Build the 1577 @echo '* vmlinux - Build the bare kernel'
1580 @echo '* modules - Build all 1578 @echo '* modules - Build all modules'
1581 @echo ' modules_install - Install a 1579 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1582 @echo ' vdso_install - Install u <<
1583 @echo ' dir/ - Build all 1580 @echo ' dir/ - Build all files in dir and below'
1584 @echo ' dir/file.[ois] - Build spe 1581 @echo ' dir/file.[ois] - Build specified target only'
1585 @echo ' dir/file.ll - Build the 1582 @echo ' dir/file.ll - Build the LLVM assembly file'
1586 @echo ' (requires 1583 @echo ' (requires compiler support for LLVM assembly generation)'
1587 @echo ' dir/file.lst - Build spe 1584 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1588 @echo ' (requires 1585 @echo ' (requires a recent binutils and recent build (System.map))'
1589 @echo ' dir/file.ko - Build mod 1586 @echo ' dir/file.ko - Build module including final link'
1590 @echo ' modules_prepare - Set up fo 1587 @echo ' modules_prepare - Set up for building external modules'
1591 @echo ' tags/TAGS - Generate 1588 @echo ' tags/TAGS - Generate tags file for editors'
1592 @echo ' cscope - Generate 1589 @echo ' cscope - Generate cscope index'
1593 @echo ' gtags - Generate 1590 @echo ' gtags - Generate GNU GLOBAL index'
1594 @echo ' kernelrelease - Output th 1591 @echo ' kernelrelease - Output the release version string (use with make -s)'
1595 @echo ' kernelversion - Output th 1592 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1596 @echo ' image_name - Output th 1593 @echo ' image_name - Output the image name (use with make -s)'
1597 @echo ' headers_install - Install s 1594 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1598 echo ' (default: 1595 echo ' (default: $(INSTALL_HDR_PATH))'; \
1599 echo '' 1596 echo ''
1600 @echo 'Static analysers:' 1597 @echo 'Static analysers:'
1601 @echo ' checkstack - Generate !! 1598 @echo ' checkstack - Generate a list of stack hogs'
1602 @echo ' with a st <<
1603 @echo ' versioncheck - Sanity ch 1599 @echo ' versioncheck - Sanity check on version.h usage'
1604 @echo ' includecheck - Check for 1600 @echo ' includecheck - Check for duplicate included header files'
1605 @echo ' export_report - List the 1601 @echo ' export_report - List the usages of all exported symbols'
1606 @echo ' headerdep - Detect in 1602 @echo ' headerdep - Detect inclusion cycles in headers'
1607 @echo ' coccicheck - Check wit 1603 @echo ' coccicheck - Check with Coccinelle'
1608 @echo ' clang-analyzer - Check wit 1604 @echo ' clang-analyzer - Check with clang static analyzer'
1609 @echo ' clang-tidy - Check wit 1605 @echo ' clang-tidy - Check with clang-tidy'
1610 @echo '' 1606 @echo ''
1611 @echo 'Tools:' 1607 @echo 'Tools:'
1612 @echo ' nsdeps - Generate 1608 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1613 @echo '' 1609 @echo ''
1614 @echo 'Kernel selftest:' 1610 @echo 'Kernel selftest:'
1615 @echo ' kselftest - Build a 1611 @echo ' kselftest - Build and run kernel selftest'
1616 @echo ' Build, 1612 @echo ' Build, install, and boot kernel before'
1617 @echo ' running 1613 @echo ' running kselftest on it'
1618 @echo ' Run as 1614 @echo ' Run as root for full coverage'
1619 @echo ' kselftest-all - Build k 1615 @echo ' kselftest-all - Build kernel selftest'
1620 @echo ' kselftest-install - Build a 1616 @echo ' kselftest-install - Build and install kernel selftest'
1621 @echo ' kselftest-clean - Remove 1617 @echo ' kselftest-clean - Remove all generated kselftest files'
1622 @echo ' kselftest-merge - Merge a 1618 @echo ' kselftest-merge - Merge all the config dependencies of'
1623 @echo ' kselfte 1619 @echo ' kselftest to existing .config.'
1624 @echo '' 1620 @echo ''
1625 @echo 'Rust targets:' <<
1626 @echo ' rustavailable - Checks wh <<
1627 @echo ' available <<
1628 @echo ' rustfmt - Reformat <<
1629 @echo ' rustfmtcheck - Checks if <<
1630 @echo ' is format <<
1631 @echo ' rustdoc - Generate <<
1632 @echo ' (requires <<
1633 @echo ' rusttest - Runs the <<
1634 @echo ' (requires <<
1635 @echo ' rust-analyzer - Generate <<
1636 @echo ' (requires <<
1637 @echo ' dir/file.[os] - Build spe <<
1638 @echo ' dir/file.rsi - Build mac <<
1639 @echo ' Run with <<
1640 @echo ' The outpu <<
1641 @echo ' dir/file.ll - Build the <<
1642 @echo '' <<
1643 @$(if $(dtstree), \ 1621 @$(if $(dtstree), \
1644 echo 'Devicetree:'; \ 1622 echo 'Devicetree:'; \
1645 echo '* dtbs - !! 1623 echo '* dtbs - Build device tree blobs for enabled boards'; \
1646 echo ' dtbs_install - !! 1624 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1647 echo ' dt_binding_check - !! 1625 echo ' dt_binding_check - Validate device tree binding documents'; \
1648 echo ' dt_binding_schemas - !! 1626 echo ' dtbs_check - Validate device tree source files';\
1649 echo ' dtbs_check - <<
1650 echo '') 1627 echo '')
1651 1628
1652 @echo 'Userspace tools targets:' 1629 @echo 'Userspace tools targets:'
1653 @echo ' use "make tools/help"' 1630 @echo ' use "make tools/help"'
1654 @echo ' or "cd tools; make help"' 1631 @echo ' or "cd tools; make help"'
1655 @echo '' 1632 @echo ''
1656 @echo 'Kernel packaging:' 1633 @echo 'Kernel packaging:'
1657 @$(MAKE) -f $(srctree)/scripts/Makefi 1634 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1658 @echo '' 1635 @echo ''
1659 @echo 'Documentation targets:' 1636 @echo 'Documentation targets:'
1660 @$(MAKE) -f $(srctree)/Documentation/ 1637 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1661 @echo '' 1638 @echo ''
1662 @echo 'Architecture-specific targets !! 1639 @echo 'Architecture specific targets ($(SRCARCH)):'
1663 @$(or $(archhelp),\ !! 1640 @$(if $(archhelp),$(archhelp),\
1664 echo ' No architecture-speci !! 1641 echo ' No architecture specific help defined for $(SRCARCH)')
1665 @echo '' 1642 @echo ''
1666 @$(if $(boards), \ 1643 @$(if $(boards), \
1667 $(foreach b, $(boards), \ 1644 $(foreach b, $(boards), \
1668 printf " %-27s - Build for % 1645 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1669 echo '') 1646 echo '')
1670 @$(if $(board-dirs), \ 1647 @$(if $(board-dirs), \
1671 $(foreach b, $(board-dirs), \ 1648 $(foreach b, $(board-dirs), \
1672 printf " %-16s - Show %s-spe 1649 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1673 printf " %-16s - Show all of 1650 printf " %-16s - Show all of the above\\n" help-boards; \
1674 echo '') 1651 echo '')
1675 1652
1676 @echo ' make V=n [targets] 1: ver !! 1653 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1677 @echo ' 2: giv !! 1654 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1678 @echo ' V=1 an <<
1679 @echo ' make O=dir [targets] Locate 1655 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1680 @echo ' make C=1 [targets] Check 1656 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1681 @echo ' (spars 1657 @echo ' (sparse by default)'
1682 @echo ' make C=2 [targets] Force 1658 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1683 @echo ' make RECORDMCOUNT_WARN=1 [t 1659 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1684 @echo ' make W=n [targets] Enable !! 1660 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1685 @echo ' 1: warnings w 1661 @echo ' 1: warnings which may be relevant and do not occur too often'
1686 @echo ' 2: warnings w 1662 @echo ' 2: warnings which occur quite often but may still be relevant'
1687 @echo ' 3: more obscu 1663 @echo ' 3: more obscure warnings, can most likely be ignored'
1688 @echo ' c: extra chec <<
1689 @echo ' e: warnings a <<
1690 @echo ' Multiple leve 1664 @echo ' Multiple levels can be combined with W=12 or W=123'
1691 @$(if $(dtstree), \ <<
1692 echo ' make CHECK_DTBS=1 [ta <<
1693 echo ' This can be ap <<
1694 ) <<
1695 @echo '' 1665 @echo ''
1696 @echo 'Execute "make" or "make all" 1666 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1697 @echo 'For further info see the ./RE 1667 @echo 'For further info see the ./README file'
1698 1668
1699 1669
1700 help-board-dirs := $(addprefix help-,$(board- 1670 help-board-dirs := $(addprefix help-,$(board-dirs))
1701 1671
1702 help-boards: $(help-board-dirs) 1672 help-boards: $(help-board-dirs)
1703 1673
1704 boards-per-dir = $(sort $(notdir $(wildcard $ 1674 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1705 1675
1706 $(help-board-dirs): help-%: 1676 $(help-board-dirs): help-%:
1707 @echo 'Architecture-specific targets !! 1677 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1708 @$(if $(boards-per-dir), \ 1678 @$(if $(boards-per-dir), \
1709 $(foreach b, $(boards-per-dir 1679 $(foreach b, $(boards-per-dir), \
1710 printf " %-24s - Build for % 1680 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1711 echo '') 1681 echo '')
1712 1682
1713 1683
1714 # Documentation targets 1684 # Documentation targets
1715 # ------------------------------------------- 1685 # ---------------------------------------------------------------------------
1716 DOC_TARGETS := xmldocs latexdocs pdfdocs html 1686 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1717 linkcheckdocs dochelp refcheck !! 1687 linkcheckdocs dochelp refcheckdocs
1718 PHONY += $(DOC_TARGETS) 1688 PHONY += $(DOC_TARGETS)
1719 $(DOC_TARGETS): 1689 $(DOC_TARGETS):
1720 $(Q)$(MAKE) $(build)=Documentation $@ 1690 $(Q)$(MAKE) $(build)=Documentation $@
1721 1691
1722 <<
1723 # Rust targets <<
1724 # ------------------------------------------- <<
1725 <<
1726 # "Is Rust available?" target <<
1727 PHONY += rustavailable <<
1728 rustavailable: <<
1729 +$(Q)$(CONFIG_SHELL) $(srctree)/scrip <<
1730 <<
1731 # Documentation target <<
1732 # <<
1733 # Using the singular to avoid running afoul o <<
1734 PHONY += rustdoc <<
1735 rustdoc: prepare <<
1736 $(Q)$(MAKE) $(build)=rust $@ <<
1737 <<
1738 # Testing target <<
1739 PHONY += rusttest <<
1740 rusttest: prepare <<
1741 $(Q)$(MAKE) $(build)=rust $@ <<
1742 <<
1743 # Formatting targets <<
1744 PHONY += rustfmt rustfmtcheck <<
1745 <<
1746 # We skip `rust/alloc` since we want to minim <<
1747 # <<
1748 # We match using absolute paths since `find` <<
1749 # when matching, which is a problem when e.g. <<
1750 # We `grep` afterwards in order to remove the <<
1751 rustfmt: <<
1752 $(Q)find $(abs_srctree) -type f -name <<
1753 -o -path $(abs_srctree)/rust/ <<
1754 -o -path $(abs_objtree)/rust/ <<
1755 | grep -Fv $(abs_srctree)/rus <<
1756 | grep -Fv $(abs_objtree)/rus <<
1757 | grep -Fv generated \ <<
1758 | xargs $(RUSTFMT) $(rustfmt_ <<
1759 <<
1760 rustfmtcheck: rustfmt_flags = --check <<
1761 rustfmtcheck: rustfmt <<
1762 <<
1763 # Misc 1692 # Misc
1764 # ------------------------------------------- 1693 # ---------------------------------------------------------------------------
1765 1694
1766 PHONY += misc-check <<
1767 misc-check: <<
1768 $(Q)$(srctree)/scripts/misc-check <<
1769 <<
1770 all: misc-check <<
1771 <<
1772 PHONY += scripts_gdb 1695 PHONY += scripts_gdb
1773 scripts_gdb: prepare0 1696 scripts_gdb: prepare0
1774 $(Q)$(MAKE) $(build)=scripts/gdb 1697 $(Q)$(MAKE) $(build)=scripts/gdb
1775 $(Q)ln -fsn $(abspath $(srctree)/scri 1698 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1776 1699
1777 ifdef CONFIG_GDB_SCRIPTS 1700 ifdef CONFIG_GDB_SCRIPTS
1778 all: scripts_gdb 1701 all: scripts_gdb
1779 endif 1702 endif
1780 1703
1781 else # KBUILD_EXTMOD 1704 else # KBUILD_EXTMOD
1782 1705
1783 filechk_kernel.release = echo $(KERNELRELEASE <<
1784 <<
1785 ### 1706 ###
1786 # External module support. 1707 # External module support.
1787 # When building external modules the kernel u 1708 # When building external modules the kernel used as basis is considered
1788 # read-only, and no consistency checks are ma 1709 # read-only, and no consistency checks are made and the make
1789 # system is not used on the basis kernel. If 1710 # system is not used on the basis kernel. If updates are required
1790 # in the basis kernel ordinary make commands 1711 # in the basis kernel ordinary make commands (without M=...) must be used.
1791 1712
1792 # We are always building only modules. 1713 # We are always building only modules.
1793 KBUILD_BUILTIN := 1714 KBUILD_BUILTIN :=
1794 KBUILD_MODULES := 1 1715 KBUILD_MODULES := 1
1795 1716
1796 build-dir := $(KBUILD_EXTMOD) !! 1717 build-dirs := $(KBUILD_EXTMOD)
>> 1718 $(MODORDER): descend
>> 1719 @:
1797 1720
1798 compile_commands.json: $(extmod_prefix)compil 1721 compile_commands.json: $(extmod_prefix)compile_commands.json
1799 PHONY += compile_commands.json 1722 PHONY += compile_commands.json
1800 1723
1801 clean-dirs := $(KBUILD_EXTMOD) 1724 clean-dirs := $(KBUILD_EXTMOD)
1802 clean: private rm-files := $(KBUILD_EXTMOD)/M !! 1725 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1803 $(KBUILD_EXTMOD)/compile_commands.jso !! 1726 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache
1804 1727
1805 PHONY += prepare 1728 PHONY += prepare
1806 # now expand this into a simple variable to r 1729 # now expand this into a simple variable to reduce the cost of shell evaluations
1807 prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT 1730 prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT)
1808 prepare: 1731 prepare:
1809 @if [ "$(CC_VERSION_TEXT)" != "$(CONF !! 1732 @if [ "$(CC_VERSION_TEXT)" != $(CONFIG_CC_VERSION_TEXT) ]; then \
1810 echo >&2 "warning: the compil 1733 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \
1811 echo >&2 " The kernel was bu !! 1734 echo >&2 " The kernel was built by: "$(CONFIG_CC_VERSION_TEXT); \
1812 echo >&2 " You are using: 1735 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \
1813 fi 1736 fi
1814 1737
1815 PHONY += help 1738 PHONY += help
1816 help: 1739 help:
1817 @echo ' Building external modules.' 1740 @echo ' Building external modules.'
1818 @echo ' Syntax: make -C path/to/ker 1741 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1819 @echo '' 1742 @echo ''
1820 @echo ' modules - default t 1743 @echo ' modules - default target, build the module(s)'
1821 @echo ' modules_install - install t 1744 @echo ' modules_install - install the module'
1822 @echo ' clean - remove ge 1745 @echo ' clean - remove generated files in module directory only'
1823 @echo ' rust-analyzer - generate <<
1824 @echo '' 1746 @echo ''
1825 1747
1826 ifndef CONFIG_MODULES !! 1748 # no-op for external module builds
1827 modules modules_install: __external_modules_e !! 1749 PHONY += modules_prepare
1828 __external_modules_error: <<
1829 @echo >&2 '***' <<
1830 @echo >&2 '*** The present kernel dis <<
1831 @echo >&2 '*** You cannot build or in <<
1832 @echo >&2 '***' <<
1833 @false <<
1834 endif <<
1835 1750
1836 endif # KBUILD_EXTMOD 1751 endif # KBUILD_EXTMOD
1837 1752
1838 # ------------------------------------------- 1753 # ---------------------------------------------------------------------------
1839 # Modules 1754 # Modules
1840 1755
1841 PHONY += modules modules_install modules_sign !! 1756 PHONY += modules modules_install
1842 <<
1843 modules_install: <<
1844 $(Q)$(MAKE) -f $(srctree)/scripts/Mak <<
1845 sign-only=$(if $(filter modules_insta <<
1846 <<
1847 ifeq ($(CONFIG_MODULE_SIG),y) <<
1848 # modules_sign is a subset of modules_install <<
1849 # 'make modules_install modules_sign' is equi <<
1850 modules_sign: modules_install <<
1851 @: <<
1852 else <<
1853 modules_sign: <<
1854 @echo >&2 '***' <<
1855 @echo >&2 '*** CONFIG_MODULE_SIG is d <<
1856 @echo >&2 '***' <<
1857 @false <<
1858 endif <<
1859 1757
1860 ifdef CONFIG_MODULES 1758 ifdef CONFIG_MODULES
1861 1759
1862 $(MODORDER): $(build-dir) !! 1760 modules: modules_check
1863 @: !! 1761 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1864 <<
1865 # KBUILD_MODPOST_NOFINAL can be set to skip t <<
1866 # This is solely useful to speed up test comp <<
1867 modules: modpost <<
1868 ifneq ($(KBUILD_MODPOST_NOFINAL),1) <<
1869 $(Q)$(MAKE) -f $(srctree)/scripts/Mak <<
1870 endif <<
1871 1762
1872 PHONY += modules_check 1763 PHONY += modules_check
1873 modules_check: $(MODORDER) 1764 modules_check: $(MODORDER)
1874 $(Q)$(CONFIG_SHELL) $(srctree)/script 1765 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1875 1766
>> 1767 quiet_cmd_depmod = DEPMOD $(MODLIB)
>> 1768 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
>> 1769 $(KERNELRELEASE)
>> 1770
>> 1771 modules_install:
>> 1772 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
>> 1773 $(call cmd,depmod)
>> 1774
1876 else # CONFIG_MODULES 1775 else # CONFIG_MODULES
1877 1776
1878 modules: !! 1777 # Modules not configured
1879 @: !! 1778 # ---------------------------------------------------------------------------
1880 1779
1881 KBUILD_MODULES := !! 1780 modules modules_install:
>> 1781 @echo >&2 '***'
>> 1782 @echo >&2 '*** The present kernel configuration has modules disabled.'
>> 1783 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.'
>> 1784 @echo >&2 '*** to enable CONFIG_MODULES.'
>> 1785 @echo >&2 '***'
>> 1786 @exit 1
1882 1787
1883 endif # CONFIG_MODULES 1788 endif # CONFIG_MODULES
1884 1789
1885 PHONY += modpost <<
1886 modpost: $(if $(single-build),, $(if $(KBUILD <<
1887 $(if $(KBUILD_MODULES), modules_chec <<
1888 $(Q)$(MAKE) -f $(srctree)/scripts/Mak <<
1889 <<
1890 # Single targets 1790 # Single targets
1891 # ------------------------------------------- 1791 # ---------------------------------------------------------------------------
1892 # To build individual files in subdirectories 1792 # To build individual files in subdirectories, you can do like this:
1893 # 1793 #
1894 # make foo/bar/baz.s 1794 # make foo/bar/baz.s
1895 # 1795 #
1896 # The supported suffixes for single-target ar 1796 # The supported suffixes for single-target are listed in 'single-targets'
1897 # 1797 #
1898 # To build only under specific subdirectories 1798 # To build only under specific subdirectories, you can do like this:
1899 # 1799 #
1900 # make foo/bar/baz/ 1800 # make foo/bar/baz/
1901 1801
1902 ifdef single-build 1802 ifdef single-build
1903 1803
1904 # .ko is special because modpost is needed 1804 # .ko is special because modpost is needed
1905 single-ko := $(sort $(filter %.ko, $(MAKECMDG 1805 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1906 single-no-ko := $(filter-out $(single-ko), $( !! 1806 single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1907 $(foreach x, o mod, $(patsubs <<
1908 1807
1909 $(single-ko): single_modules !! 1808 $(single-ko): single_modpost
1910 @: 1809 @:
1911 $(single-no-ko): $(build-dir) !! 1810 $(single-no-ko): descend
1912 @: 1811 @:
1913 1812
1914 # Remove MODORDER when done because it is not !! 1813 ifeq ($(KBUILD_EXTMOD),)
1915 PHONY += single_modules !! 1814 # For the single build of in-tree modules, use a temporary file to avoid
1916 single_modules: $(single-no-ko) modules_prepa !! 1815 # the situation of modules_install installing an invalid modules.order.
1917 $(Q){ $(foreach m, $(single-ko), echo !! 1816 MODORDER := .modules.tmp
1918 $(Q)$(MAKE) -f $(srctree)/scripts/Mak <<
1919 ifneq ($(KBUILD_MODPOST_NOFINAL),1) <<
1920 $(Q)$(MAKE) -f $(srctree)/scripts/Mak <<
1921 endif 1817 endif
1922 $(Q)rm -f $(MODORDER) <<
1923 1818
1924 single-goals := $(addprefix $(build-dir)/, $( !! 1819 PHONY += single_modpost
>> 1820 single_modpost: $(single-no-ko) modules_prepare
>> 1821 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER)
>> 1822 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1925 1823
1926 KBUILD_MODULES := 1 1824 KBUILD_MODULES := 1
1927 1825
>> 1826 export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod_prefix), $(single-no-ko))
>> 1827
>> 1828 # trim unrelated directories
>> 1829 build-dirs := $(foreach d, $(build-dirs), \
>> 1830 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
>> 1831
1928 endif 1832 endif
1929 1833
>> 1834 ifndef CONFIG_MODULES
>> 1835 KBUILD_MODULES :=
>> 1836 endif
>> 1837
>> 1838 # Handle descending into subdirectories listed in $(build-dirs)
1930 # Preset locale variables to speed up the bui 1839 # Preset locale variables to speed up the build process. Limit locale
1931 # tweaks to this spot to avoid wrong language 1840 # tweaks to this spot to avoid wrong language settings when running
1932 # make menuconfig etc. 1841 # make menuconfig etc.
1933 # Error messages still appears in the origina 1842 # Error messages still appears in the original language
1934 PHONY += $(build-dir) !! 1843 PHONY += descend $(build-dirs)
1935 $(build-dir): prepare !! 1844 descend: $(build-dirs)
1936 $(Q)$(MAKE) $(build)=$@ need-builtin= !! 1845 $(build-dirs): prepare
>> 1846 $(Q)$(MAKE) $(build)=$@ \
>> 1847 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \
>> 1848 need-builtin=1 need-modorder=1
1937 1849
1938 clean-dirs := $(addprefix _clean_, $(clean-di 1850 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1939 PHONY += $(clean-dirs) clean 1851 PHONY += $(clean-dirs) clean
1940 $(clean-dirs): 1852 $(clean-dirs):
1941 $(Q)$(MAKE) $(clean)=$(patsubst _clea 1853 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1942 1854
1943 clean: $(clean-dirs) 1855 clean: $(clean-dirs)
1944 $(call cmd,rmfiles) 1856 $(call cmd,rmfiles)
1945 @find $(or $(KBUILD_EXTMOD), .) $(RCS !! 1857 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1946 \( -name '*.[aios]' -o -name !! 1858 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1947 -o -name '*.ko.*' \ 1859 -o -name '*.ko.*' \
1948 -o -name '*.dtb' -o -name '*. !! 1860 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1949 -o -name '*.dtb.S' -o -name ' <<
1950 -o -name '*.dt.yaml' -o -name <<
1951 -o -name '*.dwo' -o -name '*. 1861 -o -name '*.dwo' -o -name '*.lst' \
1952 -o -name '*.su' -o -name '*.m 1862 -o -name '*.su' -o -name '*.mod' \
1953 -o -name '.*.d' -o -name '.*. 1863 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1954 -o -name '*.lex.c' -o -name ' 1864 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1955 -o -name '*.asn1.[ch]' \ 1865 -o -name '*.asn1.[ch]' \
1956 -o -name '*.symtypes' -o -nam 1866 -o -name '*.symtypes' -o -name 'modules.order' \
>> 1867 -o -name '.tmp_*.o.*' \
1957 -o -name '*.c.[012]*.*' \ 1868 -o -name '*.c.[012]*.*' \
1958 -o -name '*.ll' \ 1869 -o -name '*.ll' \
1959 -o -name '*.gcno' \ 1870 -o -name '*.gcno' \
1960 \) -type f -print \ !! 1871 -o -name '*.*.symversions' \) -type f -print | xargs rm -f
1961 -o -name '.tmp_*' -print \ <<
1962 | xargs rm -rf <<
1963 1872
1964 # Generate tags for editors 1873 # Generate tags for editors
1965 # ------------------------------------------- 1874 # ---------------------------------------------------------------------------
1966 quiet_cmd_tags = GEN $@ 1875 quiet_cmd_tags = GEN $@
1967 cmd_tags = $(BASH) $(srctree)/scripts/t 1876 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1968 1877
1969 tags TAGS cscope gtags: FORCE 1878 tags TAGS cscope gtags: FORCE
1970 $(call cmd,tags) 1879 $(call cmd,tags)
1971 1880
1972 # Generate rust-project.json (a file that des <<
1973 # Rust projects) for rust-analyzer (an implem <<
1974 # Protocol). <<
1975 PHONY += rust-analyzer <<
1976 rust-analyzer: <<
1977 +$(Q)$(CONFIG_SHELL) $(srctree)/scrip <<
1978 $(Q)$(MAKE) $(build)=rust $@ <<
1979 <<
1980 # Script to generate missing namespace depend 1881 # Script to generate missing namespace dependencies
1981 # ------------------------------------------- 1882 # ---------------------------------------------------------------------------
1982 1883
1983 PHONY += nsdeps 1884 PHONY += nsdeps
1984 nsdeps: export KBUILD_NSDEPS=1 1885 nsdeps: export KBUILD_NSDEPS=1
1985 nsdeps: modules 1886 nsdeps: modules
1986 $(Q)$(CONFIG_SHELL) $(srctree)/script 1887 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1987 1888
1988 # Clang Tooling 1889 # Clang Tooling
1989 # ------------------------------------------- 1890 # ---------------------------------------------------------------------------
1990 1891
1991 quiet_cmd_gen_compile_commands = GEN $@ 1892 quiet_cmd_gen_compile_commands = GEN $@
1992 cmd_gen_compile_commands = $(PYTHON3) $ 1893 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
1993 1894
1994 $(extmod_prefix)compile_commands.json: $(srct !! 1895 $(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
1995 $(if $(KBUILD_EXTMOD),, vmlinux.a $(K !! 1896 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \
1996 $(if $(CONFIG_MODULES), $(MODORDER)) 1897 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
1997 $(call if_changed,gen_compile_command 1898 $(call if_changed,gen_compile_commands)
1998 1899
1999 targets += $(extmod_prefix)compile_commands.j 1900 targets += $(extmod_prefix)compile_commands.json
2000 1901
2001 PHONY += clang-tidy clang-analyzer 1902 PHONY += clang-tidy clang-analyzer
2002 1903
2003 ifdef CONFIG_CC_IS_CLANG 1904 ifdef CONFIG_CC_IS_CLANG
2004 quiet_cmd_clang_tools = CHECK $< 1905 quiet_cmd_clang_tools = CHECK $<
2005 cmd_clang_tools = $(PYTHON3) $(srctree) 1906 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
2006 1907
2007 clang-tidy clang-analyzer: $(extmod_prefix)co 1908 clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json
2008 $(call cmd,clang_tools) 1909 $(call cmd,clang_tools)
2009 else 1910 else
2010 clang-tidy clang-analyzer: 1911 clang-tidy clang-analyzer:
2011 @echo "$@ requires CC=clang" >&2 1912 @echo "$@ requires CC=clang" >&2
2012 @false 1913 @false
2013 endif 1914 endif
2014 1915
2015 # Scripts to check various things for consist 1916 # Scripts to check various things for consistency
2016 # ------------------------------------------- 1917 # ---------------------------------------------------------------------------
2017 1918
2018 PHONY += includecheck versioncheck coccicheck 1919 PHONY += includecheck versioncheck coccicheck export_report
2019 1920
2020 includecheck: 1921 includecheck:
2021 find $(srctree)/* $(RCS_FIND_IGNORE) 1922 find $(srctree)/* $(RCS_FIND_IGNORE) \
2022 -name '*.[hcS]' -type f -prin 1923 -name '*.[hcS]' -type f -print | sort \
2023 | xargs $(PERL) -w $(srctree) 1924 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
2024 1925
2025 versioncheck: 1926 versioncheck:
2026 find $(srctree)/* $(RCS_FIND_IGNORE) 1927 find $(srctree)/* $(RCS_FIND_IGNORE) \
2027 -name '*.[hcS]' -type f -prin 1928 -name '*.[hcS]' -type f -print | sort \
2028 | xargs $(PERL) -w $(srctree) 1929 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
2029 1930
2030 coccicheck: 1931 coccicheck:
2031 $(Q)$(BASH) $(srctree)/scripts/$@ 1932 $(Q)$(BASH) $(srctree)/scripts/$@
2032 1933
2033 export_report: 1934 export_report:
2034 $(PERL) $(srctree)/scripts/export_rep 1935 $(PERL) $(srctree)/scripts/export_report.pl
2035 1936
2036 PHONY += checkstack kernelrelease kernelversi 1937 PHONY += checkstack kernelrelease kernelversion image_name
2037 1938
2038 # UML needs a little special treatment here. 1939 # UML needs a little special treatment here. It wants to use the host
2039 # toolchain, so needs $(SUBARCH) passed to ch 1940 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
2040 # else wants $(ARCH), including people doing 1941 # else wants $(ARCH), including people doing cross-builds, which means
2041 # that $(SUBARCH) doesn't work here. 1942 # that $(SUBARCH) doesn't work here.
2042 ifeq ($(ARCH), um) 1943 ifeq ($(ARCH), um)
2043 CHECKSTACK_ARCH := $(SUBARCH) 1944 CHECKSTACK_ARCH := $(SUBARCH)
2044 else 1945 else
2045 CHECKSTACK_ARCH := $(ARCH) 1946 CHECKSTACK_ARCH := $(ARCH)
2046 endif 1947 endif
2047 MINSTACKSIZE ?= 100 <<
2048 checkstack: 1948 checkstack:
2049 $(OBJDUMP) -d vmlinux $$(find . -name 1949 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
2050 $(PERL) $(srctree)/scripts/checkstack !! 1950 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
2051 1951
2052 kernelrelease: 1952 kernelrelease:
2053 @$(filechk_kernel.release) !! 1953 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
2054 1954
2055 kernelversion: 1955 kernelversion:
2056 @echo $(KERNELVERSION) 1956 @echo $(KERNELVERSION)
2057 1957
2058 image_name: 1958 image_name:
2059 @echo $(KBUILD_IMAGE) 1959 @echo $(KBUILD_IMAGE)
2060 <<
2061 PHONY += run-command <<
2062 run-command: <<
2063 $(Q)$(KBUILD_RUN_COMMAND) <<
2064 1960
2065 quiet_cmd_rmfiles = $(if $(wildcard $(rm-file 1961 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
2066 cmd_rmfiles = rm -rf $(rm-files) 1962 cmd_rmfiles = rm -rf $(rm-files)
2067 1963
2068 # read saved command lines for existing targe 1964 # read saved command lines for existing targets
2069 existing-targets := $(wildcard $(sort $(targe 1965 existing-targets := $(wildcard $(sort $(targets)))
2070 1966
2071 -include $(foreach f,$(existing-targets),$(di 1967 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
2072 1968
2073 endif # config-build 1969 endif # config-build
2074 endif # mixed-build 1970 endif # mixed-build
2075 endif # need-sub-make 1971 endif # need-sub-make
2076 1972
2077 PHONY += FORCE 1973 PHONY += FORCE
2078 FORCE: 1974 FORCE:
2079 1975
2080 # Declare the contents of the PHONY variable 1976 # Declare the contents of the PHONY variable as phony. We keep that
2081 # information in a variable so we can use it 1977 # information in a variable so we can use it in if_changed and friends.
2082 .PHONY: $(PHONY) 1978 .PHONY: $(PHONY)
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