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 = 9
4 SUBLEVEL = 0 !! 4 SUBLEVEL = 16
5 EXTRAVERSION = -rc7 !! 5 EXTRAVERSION =
6 NAME = Baby Opossum Posse !! 6 NAME = Kleptomaniac Octopus
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 <<
97 quiet=silent_ <<
98 override KBUILD_VERBOSE := <<
99 endif <<
100 <<
101 export quiet Q KBUILD_VERBOSE <<
102 <<
103 # Call a source code checker (by default, "spa <<
104 # C compilation. <<
105 # <<
106 # Use 'make C=1' to enable checking of only re <<
107 # Use 'make C=2' to enable checking of *all* s <<
108 # of whether they are re-compiled or not. <<
109 # <<
110 # See the file "Documentation/dev-tools/sparse <<
111 # including where to get the "sparse" utility. <<
112 <<
113 ifeq ("$(origin C)", "command line") <<
114 KBUILD_CHECKSRC = $(C) <<
115 endif <<
116 ifndef KBUILD_CHECKSRC <<
117 KBUILD_CHECKSRC = 0 <<
118 endif <<
119 <<
120 export KBUILD_CHECKSRC <<
121 <<
122 # Enable "clippy" (a linter) as part of the Ru <<
123 # <<
124 # Use 'make CLIPPY=1' to enable it. <<
125 ifeq ("$(origin CLIPPY)", "command line") <<
126 KBUILD_CLIPPY := $(CLIPPY) <<
127 endif <<
128 <<
129 export KBUILD_CLIPPY <<
130 <<
131 # Use make M=dir or set the environment variab <<
132 # directory of external module to build. Setti <<
133 ifeq ("$(origin M)", "command line") <<
134 KBUILD_EXTMOD := $(M) <<
135 endif <<
136 <<
137 $(if $(word 2, $(KBUILD_EXTMOD)), \ <<
138 $(error building multiple external mod <<
139 96
140 $(foreach x, % :, $(if $(findstring $x, $(KBUI !! 97 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
141 $(error module directory path cannot c !! 98 quiet=silent_
142 <<
143 # Remove trailing slashes <<
144 ifneq ($(filter %/, $(KBUILD_EXTMOD)),) <<
145 KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTM <<
146 endif <<
147 <<
148 export KBUILD_EXTMOD <<
149 <<
150 # backward compatibility <<
151 KBUILD_EXTRA_WARN ?= $(KBUILD_ENABLE_EXTRA_GCC <<
152 <<
153 ifeq ("$(origin W)", "command line") <<
154 KBUILD_EXTRA_WARN := $(W) <<
155 endif 99 endif
156 100
157 export KBUILD_EXTRA_WARN !! 101 export quiet Q KBUILD_VERBOSE
158 102
159 # Kbuild will save output files in the current 103 # Kbuild will save output files in the current working directory.
160 # This does not need to match to the root of t 104 # This does not need to match to the root of the kernel source tree.
161 # 105 #
162 # For example, you can do this: 106 # For example, you can do this:
163 # 107 #
164 # cd /dir/to/store/output/files; make -f /dir 108 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
165 # 109 #
166 # If you want to save output files in a differ 110 # If you want to save output files in a different location, there are
167 # two syntaxes to specify it. 111 # two syntaxes to specify it.
168 # 112 #
169 # 1) O= 113 # 1) O=
170 # Use "make O=dir/to/store/output/files/" 114 # Use "make O=dir/to/store/output/files/"
171 # 115 #
172 # 2) Set KBUILD_OUTPUT 116 # 2) Set KBUILD_OUTPUT
173 # Set the environment variable KBUILD_OUTPUT t 117 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
174 # export KBUILD_OUTPUT=dir/to/store/output/fil 118 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
175 # 119 #
176 # The O= assignment takes precedence over the 120 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
177 # variable. 121 # variable.
178 122
179 # Do we want to change the working directory? 123 # Do we want to change the working directory?
180 ifeq ("$(origin O)", "command line") 124 ifeq ("$(origin O)", "command line")
181 KBUILD_OUTPUT := $(O) 125 KBUILD_OUTPUT := $(O)
182 endif 126 endif
183 127
184 ifneq ($(KBUILD_OUTPUT),) 128 ifneq ($(KBUILD_OUTPUT),)
185 # $(realpath ...) gets empty if the path does !! 129 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
186 $(shell mkdir -p "$(KBUILD_OUTPUT)") !! 130 # expand a shell special character '~'. We use a somewhat tedious way here.
>> 131 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
>> 132 $(if $(abs_objtree),, \
>> 133 $(error failed to create output directory "$(KBUILD_OUTPUT)"))
>> 134
187 # $(realpath ...) resolves symlinks 135 # $(realpath ...) resolves symlinks
188 abs_objtree := $(realpath $(KBUILD_OUTPUT)) !! 136 abs_objtree := $(realpath $(abs_objtree))
189 $(if $(abs_objtree),,$(error failed to create !! 137 else
>> 138 abs_objtree := $(CURDIR)
190 endif # ifneq ($(KBUILD_OUTPUT),) 139 endif # ifneq ($(KBUILD_OUTPUT),)
191 140
192 ifneq ($(words $(subst :, ,$(abs_srctree))), 1 !! 141 ifeq ($(abs_objtree),$(CURDIR))
193 $(error source directory cannot contain spaces !! 142 # Suppress "Entering directory ..." unless we are changing the work directory.
>> 143 MAKEFLAGS += --no-print-directory
>> 144 else
>> 145 need-sub-make := 1
194 endif 146 endif
195 147
196 export sub_make_done := 1 !! 148 abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
197 149
198 endif # sub_make_done !! 150 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
>> 151 $(error source directory cannot contain spaces or colons)
>> 152 endif
199 153
200 ifeq ($(abs_objtree),$(CURDIR)) !! 154 ifneq ($(abs_srctree),$(abs_objtree))
201 # Suppress "Entering directory ..." if we are !! 155 # Look for make include files relative to root of kernel src
202 no-print-directory := --no-print-directory !! 156 #
203 else !! 157 # This does not become effective immediately because MAKEFLAGS is re-parsed
204 # Recursion to show "Entering directory ..." !! 158 # once after the Makefile is read. We need to invoke sub-make.
>> 159 MAKEFLAGS += --include-dir=$(abs_srctree)
205 need-sub-make := 1 160 need-sub-make := 1
206 endif 161 endif
207 162
208 ifeq ($(filter --no-print-directory, $(MAKEFLA !! 163 this-makefile := $(lastword $(MAKEFILE_LIST))
209 # If --no-print-directory is unset, recurse on !! 164
210 # You may end up recursing into __sub-make twi !! 165 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
211 # behavior change in GNU Make 4.4.1. !! 166 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
>> 167 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
212 need-sub-make := 1 168 need-sub-make := 1
>> 169 # Cancel implicit rules for this Makefile.
>> 170 $(this-makefile): ;
213 endif 171 endif
214 172
>> 173 export abs_srctree abs_objtree
>> 174 export sub_make_done := 1
>> 175
215 ifeq ($(need-sub-make),1) 176 ifeq ($(need-sub-make),1)
216 177
217 PHONY += $(MAKECMDGOALS) __sub-make 178 PHONY += $(MAKECMDGOALS) __sub-make
218 179
219 $(filter-out $(this-makefile), $(MAKECMDGOALS) 180 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
220 @: 181 @:
221 182
222 # Invoke a second make in the output directory 183 # Invoke a second make in the output directory, passing relevant variables
223 __sub-make: 184 __sub-make:
224 $(Q)$(MAKE) $(no-print-directory) -C $ !! 185 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
225 -f $(abs_srctree)/Makefile $(MAKECMDGO <<
226 186
227 else # need-sub-make !! 187 endif # need-sub-make
>> 188 endif # sub_make_done
228 189
229 # We process the rest of the Makefile if this 190 # We process the rest of the Makefile if this is the final invocation of make
>> 191 ifeq ($(need-sub-make),)
>> 192
>> 193 # Do not print "Entering directory ...",
>> 194 # but we want to display it when entering to the output directory
>> 195 # so that IDEs/editors are able to understand relative filenames.
>> 196 MAKEFLAGS += --no-print-directory
>> 197
>> 198 # Call a source code checker (by default, "sparse") as part of the
>> 199 # C compilation.
>> 200 #
>> 201 # Use 'make C=1' to enable checking of only re-compiled files.
>> 202 # Use 'make C=2' to enable checking of *all* source files, regardless
>> 203 # of whether they are re-compiled or not.
>> 204 #
>> 205 # See the file "Documentation/dev-tools/sparse.rst" for more details,
>> 206 # including where to get the "sparse" utility.
>> 207
>> 208 ifeq ("$(origin C)", "command line")
>> 209 KBUILD_CHECKSRC = $(C)
>> 210 endif
>> 211 ifndef KBUILD_CHECKSRC
>> 212 KBUILD_CHECKSRC = 0
>> 213 endif
>> 214
>> 215 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
>> 216 # directory of external module to build. Setting M= takes precedence.
>> 217 ifeq ("$(origin M)", "command line")
>> 218 KBUILD_EXTMOD := $(M)
>> 219 endif
>> 220
>> 221 $(if $(word 2, $(KBUILD_EXTMOD)), \
>> 222 $(error building multiple external modules is not supported))
>> 223
>> 224 export KBUILD_CHECKSRC KBUILD_EXTMOD
>> 225
>> 226 extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
230 227
231 ifeq ($(abs_srctree),$(abs_objtree)) 228 ifeq ($(abs_srctree),$(abs_objtree))
232 # building in the source tree 229 # building in the source tree
233 srctree := . 230 srctree := .
234 building_out_of_srctree := 231 building_out_of_srctree :=
235 else 232 else
236 ifeq ($(abs_srctree)/,$(dir $(abs_objt 233 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
237 # building in a subdirectory o 234 # building in a subdirectory of the source tree
238 srctree := .. 235 srctree := ..
239 else 236 else
240 srctree := $(abs_srctree) 237 srctree := $(abs_srctree)
241 endif 238 endif
242 building_out_of_srctree := 1 239 building_out_of_srctree := 1
243 endif 240 endif
244 241
245 ifneq ($(KBUILD_ABS_SRCTREE),) 242 ifneq ($(KBUILD_ABS_SRCTREE),)
246 srctree := $(abs_srctree) 243 srctree := $(abs_srctree)
247 endif 244 endif
248 245
249 objtree := . 246 objtree := .
250 <<
251 VPATH := <<
252 <<
253 ifeq ($(KBUILD_EXTMOD),) <<
254 ifdef building_out_of_srctree <<
255 VPATH := $(srctree) 247 VPATH := $(srctree)
256 endif <<
257 endif <<
258 248
259 export building_out_of_srctree srctree objtree 249 export building_out_of_srctree srctree objtree VPATH
260 250
261 # To make sure we do not include .config for a 251 # To make sure we do not include .config for any of the *config targets
262 # catch them early, and hand them over to scri 252 # catch them early, and hand them over to scripts/kconfig/Makefile
263 # It is allowed to specify more targets when c 253 # It is allowed to specify more targets when calling make, including
264 # mixing *config targets and build targets. 254 # mixing *config targets and build targets.
265 # For example 'make oldconfig all'. 255 # For example 'make oldconfig all'.
266 # Detect when mixed targets is specified, and 256 # Detect when mixed targets is specified, and make a second invocation
267 # of make so .config is not included in this c 257 # of make so .config is not included in this case either (for *config).
268 258
269 version_h := include/generated/uapi/linux/vers 259 version_h := include/generated/uapi/linux/version.h
>> 260 old_version_h := include/linux/version.h
270 261
271 clean-targets := %clean mrproper cleandocs 262 clean-targets := %clean mrproper cleandocs
272 no-dot-config-targets := $(clean-targets) \ 263 no-dot-config-targets := $(clean-targets) \
273 cscope gtags TAGS tag 264 cscope gtags TAGS tags help% %docs check% coccicheck \
274 $(version_h) headers 265 $(version_h) headers headers_% archheaders archscripts \
275 %asm-generic kernelve 266 %asm-generic kernelversion %src-pkg dt_binding_check \
276 outputmakefile rustav !! 267 outputmakefile
277 no-sync-config-targets := $(no-dot-config-targ !! 268 no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease
278 image_name !! 269 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
279 single-targets := %.a %.i %.ko %.lds %.ll %.ls <<
280 270
281 config-build := 271 config-build :=
282 mixed-build := 272 mixed-build :=
283 need-config := 1 273 need-config := 1
284 may-sync-config := 1 274 may-sync-config := 1
285 single-build := 275 single-build :=
286 276
287 ifneq ($(filter $(no-dot-config-targets), $(MA 277 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
288 ifeq ($(filter-out $(no-dot-config-targets !! 278 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
289 need-config := !! 279 need-config :=
290 endif !! 280 endif
291 endif 281 endif
292 282
293 ifneq ($(filter $(no-sync-config-targets), $(M 283 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
294 ifeq ($(filter-out $(no-sync-config-target !! 284 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
295 may-sync-config := !! 285 may-sync-config :=
296 endif !! 286 endif
297 endif 287 endif
298 288
299 need-compiler := $(may-sync-config) <<
300 <<
301 ifneq ($(KBUILD_EXTMOD),) 289 ifneq ($(KBUILD_EXTMOD),)
302 may-sync-config := !! 290 may-sync-config :=
303 endif 291 endif
304 292
305 ifeq ($(KBUILD_EXTMOD),) 293 ifeq ($(KBUILD_EXTMOD),)
306 ifneq ($(filter %config,$(MAKECMDGOALS)),) !! 294 ifneq ($(filter %config,$(MAKECMDGOALS)),)
307 config-build := 1 !! 295 config-build := 1
308 ifneq ($(words $(MAKECMDGOALS)),1) !! 296 ifneq ($(words $(MAKECMDGOALS)),1)
309 mixed-build := 1 !! 297 mixed-build := 1
>> 298 endif
310 endif 299 endif
311 endif <<
312 endif 300 endif
313 301
314 # We cannot build single targets and the other 302 # We cannot build single targets and the others at the same time
315 ifneq ($(filter $(single-targets), $(MAKECMDGO 303 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
316 single-build := 1 !! 304 single-build := 1
317 ifneq ($(filter-out $(single-targets), $(M !! 305 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
318 mixed-build := 1 !! 306 mixed-build := 1
319 endif !! 307 endif
320 endif 308 endif
321 309
322 # For "make -j clean all", "make -j mrproper d 310 # For "make -j clean all", "make -j mrproper defconfig all", etc.
323 ifneq ($(filter $(clean-targets),$(MAKECMDGOAL 311 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
324 ifneq ($(filter-out $(clean-targets),$(MAK !! 312 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
325 mixed-build := 1 !! 313 mixed-build := 1
326 endif !! 314 endif
327 endif 315 endif
328 316
329 # install and modules_install need also be pro 317 # install and modules_install need also be processed one by one
330 ifneq ($(filter install,$(MAKECMDGOALS)),) 318 ifneq ($(filter install,$(MAKECMDGOALS)),)
331 ifneq ($(filter modules_install,$(MAKECMDG !! 319 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
332 mixed-build := 1 !! 320 mixed-build := 1
333 endif !! 321 endif
334 endif 322 endif
335 323
336 ifdef mixed-build 324 ifdef mixed-build
337 # ============================================ 325 # ===========================================================================
338 # We're called with mixed targets (*config and 326 # We're called with mixed targets (*config and build targets).
339 # Handle them one by one. 327 # Handle them one by one.
340 328
341 PHONY += $(MAKECMDGOALS) __build_one_by_one 329 PHONY += $(MAKECMDGOALS) __build_one_by_one
342 330
343 $(MAKECMDGOALS): __build_one_by_one 331 $(MAKECMDGOALS): __build_one_by_one
344 @: 332 @:
345 333
346 __build_one_by_one: 334 __build_one_by_one:
347 $(Q)set -e; \ 335 $(Q)set -e; \
348 for i in $(MAKECMDGOALS); do \ 336 for i in $(MAKECMDGOALS); do \
349 $(MAKE) -f $(srctree)/Makefile 337 $(MAKE) -f $(srctree)/Makefile $$i; \
350 done 338 done
351 339
352 else # !mixed-build 340 else # !mixed-build
353 341
354 include $(srctree)/scripts/Kbuild.include !! 342 include scripts/Kbuild.include
355 343
356 # Read KERNELRELEASE from include/config/kerne 344 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
357 KERNELRELEASE = $(call read-file, include/conf !! 345 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
358 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),. 346 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
359 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEA 347 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
360 348
361 include $(srctree)/scripts/subarch.include !! 349 include scripts/subarch.include
362 350
363 # Cross compiling and selecting different set 351 # Cross compiling and selecting different set of gcc/bin-utils
364 # -------------------------------------------- 352 # ---------------------------------------------------------------------------
365 # 353 #
366 # When performing cross compilation for other 354 # When performing cross compilation for other architectures ARCH shall be set
367 # to the target architecture. (See arch/* for 355 # to the target architecture. (See arch/* for the possibilities).
368 # ARCH can be set during invocation of make: 356 # ARCH can be set during invocation of make:
369 # make ARCH=arm64 !! 357 # make ARCH=ia64
370 # Another way is to have ARCH set in the envir 358 # Another way is to have ARCH set in the environment.
371 # The default ARCH is the host where make is e 359 # The default ARCH is the host where make is executed.
372 360
373 # CROSS_COMPILE specify the prefix used for al 361 # CROSS_COMPILE specify the prefix used for all executables used
374 # during compilation. Only gcc and related bin 362 # during compilation. Only gcc and related bin-utils executables
375 # are prefixed with $(CROSS_COMPILE). 363 # are prefixed with $(CROSS_COMPILE).
376 # CROSS_COMPILE can be set on the command line 364 # CROSS_COMPILE can be set on the command line
377 # make CROSS_COMPILE=aarch64-linux-gnu- !! 365 # make CROSS_COMPILE=ia64-linux-
378 # Alternatively CROSS_COMPILE can be set in th 366 # Alternatively CROSS_COMPILE can be set in the environment.
379 # Default value for CROSS_COMPILE is not to pr 367 # Default value for CROSS_COMPILE is not to prefix executables
380 # Note: Some architectures assign CROSS_COMPIL 368 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
381 ARCH ?= $(SUBARCH) 369 ARCH ?= $(SUBARCH)
382 370
383 # Architecture as present in compile.h 371 # Architecture as present in compile.h
384 UTS_MACHINE := $(ARCH) 372 UTS_MACHINE := $(ARCH)
385 SRCARCH := $(ARCH) 373 SRCARCH := $(ARCH)
386 374
387 # Additional ARCH settings for x86 375 # Additional ARCH settings for x86
388 ifeq ($(ARCH),i386) 376 ifeq ($(ARCH),i386)
389 SRCARCH := x86 377 SRCARCH := x86
390 endif 378 endif
391 ifeq ($(ARCH),x86_64) 379 ifeq ($(ARCH),x86_64)
392 SRCARCH := x86 380 SRCARCH := x86
393 endif 381 endif
394 382
395 # Additional ARCH settings for sparc 383 # Additional ARCH settings for sparc
396 ifeq ($(ARCH),sparc32) 384 ifeq ($(ARCH),sparc32)
397 SRCARCH := sparc 385 SRCARCH := sparc
398 endif 386 endif
399 ifeq ($(ARCH),sparc64) 387 ifeq ($(ARCH),sparc64)
400 SRCARCH := sparc 388 SRCARCH := sparc
401 endif 389 endif
402 390
403 # Additional ARCH settings for parisc !! 391 # Additional ARCH settings for sh
404 ifeq ($(ARCH),parisc64) !! 392 ifeq ($(ARCH),sh64)
405 SRCARCH := parisc !! 393 SRCARCH := sh
406 endif <<
407 <<
408 export cross_compiling := <<
409 ifneq ($(SRCARCH),$(SUBARCH)) <<
410 cross_compiling := 1 <<
411 endif 394 endif
412 395
413 KCONFIG_CONFIG ?= .config 396 KCONFIG_CONFIG ?= .config
414 export KCONFIG_CONFIG 397 export KCONFIG_CONFIG
415 398
>> 399 # Default file for 'make defconfig'. This may be overridden by arch-Makefile.
>> 400 export KBUILD_DEFCONFIG := defconfig
>> 401
416 # SHELL used by kbuild 402 # SHELL used by kbuild
417 CONFIG_SHELL := sh 403 CONFIG_SHELL := sh
418 404
419 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 405 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
420 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAG 406 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
421 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/d 407 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
422 408
423 ifneq ($(LLVM),) 409 ifneq ($(LLVM),)
424 ifneq ($(filter %/,$(LLVM)),) !! 410 HOSTCC = clang
425 LLVM_PREFIX := $(LLVM) !! 411 HOSTCXX = clang++
426 else ifneq ($(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 412 else
433 HOSTCC = gcc 413 HOSTCC = gcc
434 HOSTCXX = g++ 414 HOSTCXX = g++
435 endif 415 endif
436 HOSTRUSTC = rustc <<
437 HOSTPKG_CONFIG = pkg-config <<
438 416
439 KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-proto !! 417 export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
440 -O2 -fomit-frame-poin !! 418 -O2 -fomit-frame-pointer -std=gnu89
441 KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) !! 419 export KBUILD_USERLDFLAGS :=
442 KBUILD_USERLDFLAGS := $(USERLDFLAGS) !! 420
443 !! 421 KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
444 # These flags apply to all Rust code in the tr !! 422 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 423 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
469 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOST 424 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
470 425
471 # Make variables (CC, etc...) 426 # Make variables (CC, etc...)
472 CPP = $(CC) -E 427 CPP = $(CC) -E
473 ifneq ($(LLVM),) 428 ifneq ($(LLVM),)
474 CC = $(LLVM_PREFIX)clang$(LLVM_SU !! 429 CC = clang
475 LD = $(LLVM_PREFIX)ld.lld$(LLVM_S !! 430 LD = ld.lld
476 AR = $(LLVM_PREFIX)llvm-ar$(LLVM_ !! 431 AR = llvm-ar
477 NM = $(LLVM_PREFIX)llvm-nm$(LLVM_ !! 432 NM = llvm-nm
478 OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$( !! 433 OBJCOPY = llvm-objcopy
479 OBJDUMP = $(LLVM_PREFIX)llvm-objdump$( !! 434 OBJDUMP = llvm-objdump
480 READELF = $(LLVM_PREFIX)llvm-readelf$( !! 435 READELF = llvm-readelf
481 STRIP = $(LLVM_PREFIX)llvm-strip$(LL !! 436 OBJSIZE = llvm-size
>> 437 STRIP = llvm-strip
482 else 438 else
483 CC = $(CROSS_COMPILE)gcc 439 CC = $(CROSS_COMPILE)gcc
484 LD = $(CROSS_COMPILE)ld 440 LD = $(CROSS_COMPILE)ld
485 AR = $(CROSS_COMPILE)ar 441 AR = $(CROSS_COMPILE)ar
486 NM = $(CROSS_COMPILE)nm 442 NM = $(CROSS_COMPILE)nm
487 OBJCOPY = $(CROSS_COMPILE)objcopy 443 OBJCOPY = $(CROSS_COMPILE)objcopy
488 OBJDUMP = $(CROSS_COMPILE)objdump 444 OBJDUMP = $(CROSS_COMPILE)objdump
489 READELF = $(CROSS_COMPILE)readelf 445 READELF = $(CROSS_COMPILE)readelf
>> 446 OBJSIZE = $(CROSS_COMPILE)size
490 STRIP = $(CROSS_COMPILE)strip 447 STRIP = $(CROSS_COMPILE)strip
491 endif 448 endif
492 RUSTC = rustc <<
493 RUSTDOC = rustdoc <<
494 RUSTFMT = rustfmt <<
495 CLIPPY_DRIVER = clippy-driver <<
496 BINDGEN = bindgen <<
497 PAHOLE = pahole 449 PAHOLE = pahole
498 RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve 450 RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
499 LEX = flex 451 LEX = flex
500 YACC = bison 452 YACC = bison
501 AWK = awk 453 AWK = awk
502 INSTALLKERNEL := installkernel 454 INSTALLKERNEL := installkernel
>> 455 DEPMOD = /sbin/depmod
503 PERL = perl 456 PERL = perl
>> 457 PYTHON = python
504 PYTHON3 = python3 458 PYTHON3 = python3
505 CHECK = sparse 459 CHECK = sparse
506 BASH = bash 460 BASH = bash
507 KGZIP = gzip 461 KGZIP = gzip
508 KBZIP2 = bzip2 462 KBZIP2 = bzip2
509 KLZOP = lzop 463 KLZOP = lzop
510 LZMA = lzma 464 LZMA = lzma
511 LZ4 = lz4c 465 LZ4 = lz4c
512 XZ = xz 466 XZ = xz
513 ZSTD = zstd 467 ZSTD = zstd
514 468
515 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC 469 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
516 -Wbitwise -Wno-return-void - 470 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
517 NOSTDINC_FLAGS := 471 NOSTDINC_FLAGS :=
518 CFLAGS_MODULE = 472 CFLAGS_MODULE =
519 RUSTFLAGS_MODULE = <<
520 AFLAGS_MODULE = 473 AFLAGS_MODULE =
521 LDFLAGS_MODULE = 474 LDFLAGS_MODULE =
522 CFLAGS_KERNEL = 475 CFLAGS_KERNEL =
523 RUSTFLAGS_KERNEL = <<
524 AFLAGS_KERNEL = 476 AFLAGS_KERNEL =
525 LDFLAGS_vmlinux = 477 LDFLAGS_vmlinux =
526 478
527 # Use USERINCLUDE when you must reference the 479 # Use USERINCLUDE when you must reference the UAPI directories only.
528 USERINCLUDE := \ 480 USERINCLUDE := \
529 -I$(srctree)/arch/$(SRCARCH)/i 481 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
530 -I$(objtree)/arch/$(SRCARCH)/i 482 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
531 -I$(srctree)/include/uapi \ 483 -I$(srctree)/include/uapi \
532 -I$(objtree)/include/generated 484 -I$(objtree)/include/generated/uapi \
533 -include $(srctree)/include/li <<
534 -include $(srctree)/include/li 485 -include $(srctree)/include/linux/kconfig.h
535 486
536 # Use LINUXINCLUDE when you must reference the 487 # Use LINUXINCLUDE when you must reference the include/ directory.
537 # Needed to be compatible with the O= option 488 # Needed to be compatible with the O= option
538 LINUXINCLUDE := \ 489 LINUXINCLUDE := \
539 -I$(srctree)/arch/$(SRCARCH)/i 490 -I$(srctree)/arch/$(SRCARCH)/include \
540 -I$(objtree)/arch/$(SRCARCH)/i 491 -I$(objtree)/arch/$(SRCARCH)/include/generated \
541 $(if $(building_out_of_srctree 492 $(if $(building_out_of_srctree),-I$(srctree)/include) \
542 -I$(objtree)/include \ 493 -I$(objtree)/include \
543 $(USERINCLUDE) 494 $(USERINCLUDE)
544 495
545 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 496 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
546 !! 497 KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
547 KBUILD_CFLAGS := !! 498 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
548 KBUILD_CFLAGS += -std=gnu11 !! 499 -Werror=implicit-function-declaration -Werror=implicit-int \
549 KBUILD_CFLAGS += -fshort-wchar !! 500 -Wno-format-security \
550 KBUILD_CFLAGS += -funsigned-char !! 501 -std=gnu89
551 KBUILD_CFLAGS += -fno-common <<
552 KBUILD_CFLAGS += -fno-PIE <<
553 KBUILD_CFLAGS += -fno-strict-aliasing <<
554 <<
555 KBUILD_CPPFLAGS := -D__KERNEL__ 502 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 := 503 KBUILD_AFLAGS_KERNEL :=
565 KBUILD_CFLAGS_KERNEL := 504 KBUILD_CFLAGS_KERNEL :=
566 KBUILD_RUSTFLAGS_KERNEL := <<
567 KBUILD_AFLAGS_MODULE := -DMODULE 505 KBUILD_AFLAGS_MODULE := -DMODULE
568 KBUILD_CFLAGS_MODULE := -DMODULE 506 KBUILD_CFLAGS_MODULE := -DMODULE
569 KBUILD_RUSTFLAGS_MODULE := --cfg MODULE <<
570 KBUILD_LDFLAGS_MODULE := 507 KBUILD_LDFLAGS_MODULE :=
>> 508 export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds
571 KBUILD_LDFLAGS := 509 KBUILD_LDFLAGS :=
572 CLANG_FLAGS := 510 CLANG_FLAGS :=
573 511
574 ifeq ($(KBUILD_CLIPPY),1) !! 512 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
575 RUSTC_OR_CLIPPY_QUIET := CLIPPY !! 513 export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
576 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) !! 514 export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
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 <<
589 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_ <<
590 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 515 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
591 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS 516 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
592 export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS <<
593 517
594 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINC 518 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
595 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODU 519 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
596 export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTF !! 520 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN CFLAGS_KCSAN
597 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODU 521 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
598 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODU !! 522 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
599 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERN !! 523 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
600 524
601 # Files to ignore in find ... statements 525 # Files to ignore in find ... statements
602 526
603 export RCS_FIND_IGNORE := \( -name SCCS -o -na 527 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
604 -name CVS -o -name . 528 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
605 -prune -o 529 -prune -o
>> 530 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
>> 531 --exclude CVS --exclude .pc --exclude .hg --exclude .git
606 532
607 # ============================================ 533 # ===========================================================================
608 # Rules shared between *config targets and bui 534 # Rules shared between *config targets and build targets
609 535
610 # Basic helpers built in scripts/basic/ 536 # Basic helpers built in scripts/basic/
611 PHONY += scripts_basic 537 PHONY += scripts_basic
612 scripts_basic: 538 scripts_basic:
613 $(Q)$(MAKE) $(build)=scripts/basic 539 $(Q)$(MAKE) $(build)=scripts/basic
>> 540 $(Q)rm -f .tmp_quiet_recordmcount
614 541
615 PHONY += outputmakefile 542 PHONY += outputmakefile
616 ifdef building_out_of_srctree <<
617 # Before starting out-of-tree build, make sure 543 # Before starting out-of-tree build, make sure the source tree is clean.
618 # outputmakefile generates a Makefile in the o 544 # outputmakefile generates a Makefile in the output directory, if using a
619 # separate output directory. This allows conve 545 # separate output directory. This allows convenient use of make in the
620 # output directory. 546 # output directory.
621 # At the same time when output Makefile genera 547 # At the same time when output Makefile generated, generate .gitignore to
622 # ignore whole output directory 548 # ignore whole output directory
623 <<
624 quiet_cmd_makefile = GEN Makefile <<
625 cmd_makefile = { \ <<
626 echo "\# Automatically generated by $( <<
627 echo "include $(srctree)/Makefile"; \ <<
628 } > Makefile <<
629 <<
630 outputmakefile: 549 outputmakefile:
631 @if [ -f $(srctree)/.config -o \ !! 550 ifdef building_out_of_srctree
>> 551 $(Q)if [ -f $(srctree)/.config -o \
632 -d $(srctree)/include/config 552 -d $(srctree)/include/config -o \
633 -d $(srctree)/arch/$(SRCARCH) 553 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
634 echo >&2 "***"; \ 554 echo >&2 "***"; \
635 echo >&2 "*** The source tree 555 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 556 echo >&2 "*** in $(abs_srctree)";\
637 echo >&2 "***"; \ 557 echo >&2 "***"; \
638 false; \ 558 false; \
639 fi 559 fi
640 $(Q)ln -fsn $(srctree) source 560 $(Q)ln -fsn $(srctree) source
641 $(call cmd,makefile) !! 561 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
642 $(Q)test -e .gitignore || \ 562 $(Q)test -e .gitignore || \
643 { echo "# this is build directory, ign 563 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
644 endif 564 endif
645 565
646 # The expansion should be delayed until arch/$ !! 566 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
647 # Some architectures define CROSS_COMPILE in a !! 567 ifneq ($(CROSS_COMPILE),)
648 # CC_VERSION_TEXT and RUSTC_VERSION_TEXT are r !! 568 CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
649 # need export), and from include/config/auto.c !! 569 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
650 # upgrade. !! 570 CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
651 CC_VERSION_TEXT = $(subst $(pound),,$(shell LC !! 571 GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
652 RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell !! 572 endif
653 !! 573 ifneq ($(GCC_TOOLCHAIN),)
654 ifneq ($(findstring clang,$(CC_VERSION_TEXT)), !! 574 CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
655 include $(srctree)/scripts/Makefile.clang !! 575 endif
>> 576 ifneq ($(LLVM_IAS),1)
>> 577 CLANG_FLAGS += -no-integrated-as
>> 578 endif
>> 579 CLANG_FLAGS += -Werror=unknown-warning-option
>> 580 KBUILD_CFLAGS += $(CLANG_FLAGS)
>> 581 KBUILD_AFLAGS += $(CLANG_FLAGS)
>> 582 export CLANG_FLAGS
656 endif 583 endif
657 584
658 # Include this also for config targets because !! 585 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
659 # cc-cross-prefix to determine CROSS_COMPILE. !! 586 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
660 ifdef need-compiler !! 587 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
661 include $(srctree)/scripts/Makefile.compiler !! 588 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
662 endif !! 589 CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
663 590
664 ifdef config-build 591 ifdef config-build
665 # ============================================ 592 # ===========================================================================
666 # *config targets only - make sure prerequisit 593 # *config targets only - make sure prerequisites are updated, and descend
667 # in scripts/kconfig to make the *config targe 594 # in scripts/kconfig to make the *config target
668 595
669 # Read arch-specific Makefile to set KBUILD_DE !! 596 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
670 # KBUILD_DEFCONFIG may point out an alternativ 597 # KBUILD_DEFCONFIG may point out an alternative default configuration
671 # used for 'make defconfig' 598 # used for 'make defconfig'
672 include $(srctree)/arch/$(SRCARCH)/Makefile !! 599 include arch/$(SRCARCH)/Makefile
673 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERS !! 600 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
674 601
675 config: outputmakefile scripts_basic FORCE 602 config: outputmakefile scripts_basic FORCE
676 $(Q)$(MAKE) $(build)=scripts/kconfig $ 603 $(Q)$(MAKE) $(build)=scripts/kconfig $@
677 604
678 %config: outputmakefile scripts_basic FORCE 605 %config: outputmakefile scripts_basic FORCE
679 $(Q)$(MAKE) $(build)=scripts/kconfig $ 606 $(Q)$(MAKE) $(build)=scripts/kconfig $@
680 607
681 else #!config-build 608 else #!config-build
682 # ============================================ 609 # ===========================================================================
683 # Build targets only - this includes vmlinux, !! 610 # Build targets only - this includes vmlinux, arch specific targets, clean
684 # targets and others. In general all targets e 611 # targets and others. In general all targets except *config targets.
685 612
686 # If building an external module we do not car 613 # If building an external module we do not care about the all: rule
687 # but instead __all depend on modules 614 # but instead __all depend on modules
688 PHONY += all 615 PHONY += all
689 ifeq ($(KBUILD_EXTMOD),) 616 ifeq ($(KBUILD_EXTMOD),)
690 __all: all 617 __all: all
691 else 618 else
692 __all: modules 619 __all: modules
693 endif 620 endif
694 621
695 targets := <<
696 <<
697 # Decide whether to build built-in, modular, o 622 # Decide whether to build built-in, modular, or both.
698 # Normally, just do built-in. 623 # Normally, just do built-in.
699 624
700 KBUILD_MODULES := 625 KBUILD_MODULES :=
701 KBUILD_BUILTIN := 1 626 KBUILD_BUILTIN := 1
702 627
703 # If we have only "make modules", don't compil 628 # If we have only "make modules", don't compile built-in objects.
704 ifeq ($(MAKECMDGOALS),modules) 629 ifeq ($(MAKECMDGOALS),modules)
705 KBUILD_BUILTIN := 630 KBUILD_BUILTIN :=
706 endif 631 endif
707 632
708 # If we have "make <whatever> modules", compil 633 # If we have "make <whatever> modules", compile modules
709 # in addition to whatever we do anyway. 634 # in addition to whatever we do anyway.
710 # Just "make" or "make all" shall build module 635 # Just "make" or "make all" shall build modules as well
711 636
712 ifneq ($(filter all modules nsdeps %compile_co !! 637 ifneq ($(filter all modules nsdeps,$(MAKECMDGOALS)),)
713 KBUILD_MODULES := 1 638 KBUILD_MODULES := 1
714 endif 639 endif
715 640
716 ifeq ($(MAKECMDGOALS),) 641 ifeq ($(MAKECMDGOALS),)
717 KBUILD_MODULES := 1 642 KBUILD_MODULES := 1
718 endif 643 endif
719 644
720 export KBUILD_MODULES KBUILD_BUILTIN 645 export KBUILD_MODULES KBUILD_BUILTIN
721 646
722 ifdef need-config 647 ifdef need-config
723 include include/config/auto.conf 648 include include/config/auto.conf
724 endif 649 endif
725 650
726 ifeq ($(KBUILD_EXTMOD),) 651 ifeq ($(KBUILD_EXTMOD),)
727 # Objects we will link into vmlinux / subdirs 652 # Objects we will link into vmlinux / subdirs we need to visit
728 core-y := !! 653 core-y := init/ usr/
729 drivers-y := !! 654 drivers-y := drivers/ sound/
>> 655 drivers-$(CONFIG_SAMPLES) += samples/
>> 656 drivers-y += net/ virt/
730 libs-y := lib/ 657 libs-y := lib/
731 endif # KBUILD_EXTMOD 658 endif # KBUILD_EXTMOD
732 659
733 # The all: target is the default when no targe 660 # The all: target is the default when no target is given on the
734 # command line. 661 # command line.
735 # This allow a user to issue only 'make' to bu 662 # This allow a user to issue only 'make' to build a kernel including modules
736 # Defaults to vmlinux, but the arch makefile u 663 # Defaults to vmlinux, but the arch makefile usually adds further targets
737 all: vmlinux 664 all: vmlinux
738 665
739 CFLAGS_GCOV := -fprofile-arcs -ftest-cover !! 666 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \
740 ifdef CONFIG_CC_IS_GCC !! 667 $(call cc-option,-fno-tree-loop-im) \
741 CFLAGS_GCOV += -fno-tree-loop-im !! 668 $(call cc-disable-warning,maybe-uninitialized,)
742 endif <<
743 export CFLAGS_GCOV 669 export CFLAGS_GCOV
744 670
745 # The arch Makefiles can override CC_FLAGS_FTR 671 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
746 ifdef CONFIG_FUNCTION_TRACER 672 ifdef CONFIG_FUNCTION_TRACER
747 CC_FLAGS_FTRACE := -pg 673 CC_FLAGS_FTRACE := -pg
748 endif 674 endif
749 675
750 include $(srctree)/arch/$(SRCARCH)/Makefile !! 676 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
>> 677 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
>> 678 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
>> 679 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
>> 680 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
>> 681 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
>> 682 export RETPOLINE_CFLAGS
>> 683 export RETPOLINE_VDSO_CFLAGS
>> 684
>> 685 include arch/$(SRCARCH)/Makefile
751 686
752 ifdef need-config 687 ifdef need-config
753 ifdef may-sync-config 688 ifdef may-sync-config
754 # Read in dependencies to all Kconfig* files, 689 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
755 # changes are detected. This should be include 690 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
756 # because some architectures define CROSS_COMP 691 # because some architectures define CROSS_COMPILE there.
757 include include/config/auto.conf.cmd 692 include include/config/auto.conf.cmd
758 693
759 $(KCONFIG_CONFIG): 694 $(KCONFIG_CONFIG):
760 @echo >&2 '***' 695 @echo >&2 '***'
761 @echo >&2 '*** Configuration file "$@" 696 @echo >&2 '*** Configuration file "$@" not found!'
762 @echo >&2 '***' 697 @echo >&2 '***'
763 @echo >&2 '*** Please run some configu 698 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
764 @echo >&2 '*** "make menuconfig" or "m 699 @echo >&2 '*** "make menuconfig" or "make xconfig").'
765 @echo >&2 '***' 700 @echo >&2 '***'
766 @/bin/false 701 @/bin/false
767 702
768 # The actual configuration files used during t 703 # The actual configuration files used during the build are stored in
769 # include/generated/ and include/config/. Upda 704 # include/generated/ and include/config/. Update them if .config is newer than
770 # include/config/auto.conf (which mirrors .con 705 # include/config/auto.conf (which mirrors .config).
771 # 706 #
772 # This exploits the 'multi-target pattern rule 707 # This exploits the 'multi-target pattern rule' trick.
773 # The syncconfig should be executed only once 708 # The syncconfig should be executed only once to make all the targets.
774 # (Note: use the grouped target '&:' when we b 709 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
775 # !! 710 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
776 # Do not use $(call cmd,...) here. That would <<
777 # so you cannot notice that Kconfig is waiting <<
778 %/config/auto.conf %/config/auto.conf.cmd %/ge <<
779 $(Q)$(kecho) " SYNC $@" <<
780 $(Q)$(MAKE) -f $(srctree)/Makefile syn 711 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
781 else # !may-sync-config 712 else # !may-sync-config
782 # External modules and some install targets ne 713 # External modules and some install targets need include/generated/autoconf.h
783 # and include/config/auto.conf but do not care 714 # and include/config/auto.conf but do not care if they are up-to-date.
784 # Use auto.conf to trigger the test 715 # Use auto.conf to trigger the test
785 PHONY += include/config/auto.conf 716 PHONY += include/config/auto.conf
786 717
787 include/config/auto.conf: 718 include/config/auto.conf:
788 @test -e include/generated/autoconf.h !! 719 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
789 echo >&2; 720 echo >&2; \
790 echo >&2 " ERROR: Kernel configuratio 721 echo >&2 " ERROR: Kernel configuration is invalid."; \
791 echo >&2 " include/generated/a 722 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
792 echo >&2 " Run 'make oldconfig 723 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
793 echo >&2 ; 724 echo >&2 ; \
794 /bin/false) 725 /bin/false)
795 726
796 endif # may-sync-config 727 endif # may-sync-config
797 endif # need-config 728 endif # need-config
798 729
799 KBUILD_CFLAGS += -fno-delete-null-pointer-ch !! 730 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
>> 731 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
>> 732 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
>> 733 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
>> 734 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
800 735
801 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 736 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
802 KBUILD_CFLAGS += -O2 737 KBUILD_CFLAGS += -O2
803 KBUILD_RUSTFLAGS += -Copt-level=2 !! 738 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
>> 739 KBUILD_CFLAGS += -O3
804 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 740 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
805 KBUILD_CFLAGS += -Os 741 KBUILD_CFLAGS += -Os
806 KBUILD_RUSTFLAGS += -Copt-level=s <<
807 endif 742 endif
808 743
809 # Always set `debug-assertions` and `overflow- <<
810 # depends on `opt-level` and `debug-assertions <<
811 KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $( <<
812 KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(C <<
813 <<
814 # Tell gcc to never replace conditional load w 744 # Tell gcc to never replace conditional load with a non-conditional one
815 ifdef CONFIG_CC_IS_GCC <<
816 # gcc-10 renamed --param=allow-store-data-race <<
817 # -fno-allow-store-data-races. <<
818 KBUILD_CFLAGS += $(call cc-option,--param=al 745 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
819 KBUILD_CFLAGS += $(call cc-option,-fno-allow 746 KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
820 endif <<
821 747
822 ifdef CONFIG_READABLE_ASM 748 ifdef CONFIG_READABLE_ASM
823 # Disable optimizations that make assembler li 749 # Disable optimizations that make assembler listings hard to read.
824 # reorder blocks reorders the control in the f 750 # reorder blocks reorders the control in the function
825 # ipa clone creates specialized cloned functio 751 # ipa clone creates specialized cloned functions
826 # partial inlining inlines only parts of funct 752 # partial inlining inlines only parts of functions
827 KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa- !! 753 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
>> 754 $(call cc-option,-fno-ipa-cp-clone,) \
>> 755 $(call cc-option,-fno-partial-inlining)
>> 756 endif
>> 757
>> 758 ifneq ($(CONFIG_FRAME_WARN),0)
>> 759 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
828 endif 760 endif
829 761
830 stackp-flags-y 762 stackp-flags-y := -fno-stack-protector
831 stackp-flags-$(CONFIG_STACKPROTECTOR) 763 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
832 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) 764 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
833 765
834 KBUILD_CFLAGS += $(stackp-flags-y) 766 KBUILD_CFLAGS += $(stackp-flags-y)
835 767
836 KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarning !! 768 ifdef CONFIG_CC_IS_CLANG
837 KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) !! 769 KBUILD_CPPFLAGS += -Qunused-arguments
>> 770 KBUILD_CFLAGS += -Wno-format-invalid-specifier
>> 771 KBUILD_CFLAGS += -Wno-gnu
>> 772 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
>> 773 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
>> 774 # See modpost pattern 2
>> 775 KBUILD_CFLAGS += -mno-global-merge
>> 776 else
>> 777
>> 778 # These warnings generated too much noise in a regular build.
>> 779 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
>> 780 KBUILD_CFLAGS += -Wno-unused-but-set-variable
>> 781
>> 782 # Warn about unmarked fall-throughs in switch statement.
>> 783 # Disabled for clang while comment to attribute conversion happens and
>> 784 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
>> 785 KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
>> 786 endif
838 787
>> 788 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
839 ifdef CONFIG_FRAME_POINTER 789 ifdef CONFIG_FRAME_POINTER
840 KBUILD_CFLAGS += -fno-omit-frame-pointer -fn 790 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
841 KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y <<
842 else 791 else
843 # Some targets (ARM with Thumb2, for example), 792 # Some targets (ARM with Thumb2, for example), can't be built with frame
844 # pointers. For those, we don't have FUNCTION 793 # pointers. For those, we don't have FUNCTION_TRACER automatically
845 # select FRAME_POINTER. However, FUNCTION_TRA 794 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
846 # incompatible with -fomit-frame-pointer with 795 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
847 # -fomit-frame-pointer with FUNCTION_TRACER. 796 # -fomit-frame-pointer with FUNCTION_TRACER.
848 # In the Rust target specification, "frame-poi <<
849 # to "may-omit". <<
850 ifndef CONFIG_FUNCTION_TRACER 797 ifndef CONFIG_FUNCTION_TRACER
851 KBUILD_CFLAGS += -fomit-frame-pointer 798 KBUILD_CFLAGS += -fomit-frame-pointer
852 endif 799 endif
853 endif 800 endif
854 801
855 # Initialize all stack variables with a 0xAA p 802 # Initialize all stack variables with a 0xAA pattern.
856 ifdef CONFIG_INIT_STACK_ALL_PATTERN 803 ifdef CONFIG_INIT_STACK_ALL_PATTERN
857 KBUILD_CFLAGS += -ftrivial-auto-var-init=pat 804 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
858 endif 805 endif
859 806
860 # Initialize all stack variables with a zero v 807 # Initialize all stack variables with a zero value.
861 ifdef CONFIG_INIT_STACK_ALL_ZERO 808 ifdef CONFIG_INIT_STACK_ALL_ZERO
>> 809 # Future support for zero initialization is still being debated, see
>> 810 # https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being
>> 811 # renamed or dropped.
862 KBUILD_CFLAGS += -ftrivial-auto-var-init=zer 812 KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
863 ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER !! 813 KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
864 # https://github.com/llvm/llvm-project/issues/ !! 814 endif
865 CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivi !! 815
866 export CC_AUTO_VAR_INIT_ZERO_ENABLER !! 816 DEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments)
867 KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENA !! 817
>> 818 ifdef CONFIG_DEBUG_INFO
>> 819 ifdef CONFIG_DEBUG_INFO_SPLIT
>> 820 DEBUG_CFLAGS += -gsplit-dwarf
>> 821 else
>> 822 DEBUG_CFLAGS += -g
>> 823 endif
>> 824 ifneq ($(LLVM_IAS),1)
>> 825 KBUILD_AFLAGS += -Wa,-gdwarf-2
868 endif 826 endif
869 endif 827 endif
870 828
871 # While VLAs have been removed, GCC produces u !! 829 ifdef CONFIG_DEBUG_INFO_DWARF4
872 # for the randomize_kstack_offset feature. Dis !! 830 DEBUG_CFLAGS += -gdwarf-4
873 KBUILD_CFLAGS += $(call cc-option, -fno-stac !! 831 endif
>> 832
>> 833 ifdef CONFIG_DEBUG_INFO_REDUCED
>> 834 DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
>> 835 $(call cc-option,-fno-var-tracking)
>> 836 endif
874 837
875 # Clear used registers at func exit (to reduce !! 838 ifdef CONFIG_DEBUG_INFO_COMPRESSED
876 ifdef CONFIG_ZERO_CALL_USED_REGS !! 839 DEBUG_CFLAGS += -gz=zlib
877 KBUILD_CFLAGS += -fzero-call-used-regs=used- !! 840 KBUILD_AFLAGS += -gz=zlib
>> 841 KBUILD_LDFLAGS += --compress-debug-sections=zlib
878 endif 842 endif
879 843
>> 844 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
>> 845 export DEBUG_CFLAGS
>> 846
880 ifdef CONFIG_FUNCTION_TRACER 847 ifdef CONFIG_FUNCTION_TRACER
881 ifdef CONFIG_FTRACE_MCOUNT_USE_CC !! 848 ifdef CONFIG_FTRACE_MCOUNT_RECORD
882 CC_FLAGS_FTRACE += -mrecord-mcount !! 849 # gcc 5 supports generating the mcount tables directly
>> 850 ifeq ($(call cc-option-yn,-mrecord-mcount),y)
>> 851 CC_FLAGS_FTRACE += -mrecord-mcount
>> 852 export CC_USING_RECORD_MCOUNT := 1
>> 853 endif
883 ifdef CONFIG_HAVE_NOP_MCOUNT 854 ifdef CONFIG_HAVE_NOP_MCOUNT
884 ifeq ($(call cc-option-yn, -mnop-mcount),y 855 ifeq ($(call cc-option-yn, -mnop-mcount),y)
885 CC_FLAGS_FTRACE += -mnop-mcount 856 CC_FLAGS_FTRACE += -mnop-mcount
886 CC_FLAGS_USING += -DCC_USING_NOP_MCOU 857 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
887 endif 858 endif
888 endif 859 endif
889 endif 860 endif
890 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL <<
891 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT <<
892 CC_FLAGS_USING += -DCC_USING_NOP_MCOU <<
893 endif <<
894 endif <<
895 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT <<
896 ifdef CONFIG_HAVE_C_RECORDMCOUNT <<
897 BUILD_C_RECORDMCOUNT := y <<
898 export BUILD_C_RECORDMCOUNT <<
899 endif <<
900 endif <<
901 ifdef CONFIG_HAVE_FENTRY 861 ifdef CONFIG_HAVE_FENTRY
902 # s390-linux-gnu-gcc did not support -mfentr <<
903 ifeq ($(call cc-option-yn, -mfentry),y) 862 ifeq ($(call cc-option-yn, -mfentry),y)
904 CC_FLAGS_FTRACE += -mfentry 863 CC_FLAGS_FTRACE += -mfentry
905 CC_FLAGS_USING += -DCC_USING_FENTRY 864 CC_FLAGS_USING += -DCC_USING_FENTRY
906 endif 865 endif
907 endif 866 endif
908 export CC_FLAGS_FTRACE 867 export CC_FLAGS_FTRACE
909 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLA 868 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
910 KBUILD_AFLAGS += $(CC_FLAGS_USING) 869 KBUILD_AFLAGS += $(CC_FLAGS_USING)
>> 870 ifdef CONFIG_DYNAMIC_FTRACE
>> 871 ifdef CONFIG_HAVE_C_RECORDMCOUNT
>> 872 BUILD_C_RECORDMCOUNT := y
>> 873 export BUILD_C_RECORDMCOUNT
>> 874 endif
>> 875 endif
911 endif 876 endif
912 877
913 # We trigger additional mismatches with less i 878 # We trigger additional mismatches with less inlining
914 ifdef CONFIG_DEBUG_SECTION_MISMATCH 879 ifdef CONFIG_DEBUG_SECTION_MISMATCH
915 KBUILD_CFLAGS += -fno-inline-functions-called- !! 880 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
916 endif 881 endif
917 882
918 # `rustc`'s `-Zfunction-sections` applies to d <<
919 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 883 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
920 KBUILD_CFLAGS_KERNEL += -ffunction-sections -f 884 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
921 KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections <<
922 LDFLAGS_vmlinux += --gc-sections 885 LDFLAGS_vmlinux += --gc-sections
923 endif 886 endif
924 887
925 ifdef CONFIG_SHADOW_CALL_STACK 888 ifdef CONFIG_SHADOW_CALL_STACK
926 ifndef CONFIG_DYNAMIC_SCS <<
927 CC_FLAGS_SCS := -fsanitize=shadow-call-stac 889 CC_FLAGS_SCS := -fsanitize=shadow-call-stack
928 KBUILD_CFLAGS += $(CC_FLAGS_SCS) 890 KBUILD_CFLAGS += $(CC_FLAGS_SCS)
929 KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-st <<
930 endif <<
931 export CC_FLAGS_SCS 891 export CC_FLAGS_SCS
932 endif 892 endif
933 893
934 ifdef CONFIG_LTO_CLANG !! 894 ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B
935 ifdef CONFIG_LTO_CLANG_THIN !! 895 KBUILD_CFLAGS += -falign-functions=32
936 CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit <<
937 else <<
938 CC_FLAGS_LTO := -flto <<
939 endif 896 endif
940 CC_FLAGS_LTO += -fvisibility=hidden <<
941 897
942 # Limit inlining across translation units to r !! 898 # arch Makefile may override CC so keep this after arch Makefile is included
943 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 !! 899 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
944 endif <<
945 900
946 ifdef CONFIG_LTO !! 901 # warn about C99 declaration after statement
947 KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) !! 902 KBUILD_CFLAGS += -Wdeclaration-after-statement
948 KBUILD_AFLAGS += -fno-lto <<
949 export CC_FLAGS_LTO <<
950 endif <<
951 903
952 ifdef CONFIG_CFI_CLANG !! 904 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
953 CC_FLAGS_CFI := -fsanitize=kcfi !! 905 KBUILD_CFLAGS += -Wvla
954 ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS <<
955 CC_FLAGS_CFI += -fsanitize-cfi-ical <<
956 endif <<
957 ifdef CONFIG_RUST <<
958 # Always pass -Zsanitizer-cfi-normaliz <<
959 # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS. <<
960 RUSTC_FLAGS_CFI := -Zsanitizer=kcfi <<
961 KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI) <<
962 export RUSTC_FLAGS_CFI <<
963 endif <<
964 KBUILD_CFLAGS += $(CC_FLAGS_CFI) <<
965 export CC_FLAGS_CFI <<
966 endif <<
967 906
968 # Architectures can define flags to add/remove !! 907 # disable pointer signed / unsigned warnings in gcc 4.0
969 CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UN !! 908 KBUILD_CFLAGS += -Wno-pointer-sign
970 export CC_FLAGS_FPU <<
971 export CC_FLAGS_NO_FPU <<
972 909
973 ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) !! 910 # disable stringop warnings in gcc 8+
974 # Set the minimal function alignment. Use the !! 911 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
975 # -fmin-function-alignment if it is available, <<
976 # See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNME <<
977 ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT <<
978 KBUILD_CFLAGS += -fmin-function-alignment=$(CO <<
979 else <<
980 KBUILD_CFLAGS += -falign-functions=$(CONFIG_FU <<
981 endif <<
982 endif <<
983 912
984 # arch Makefile may override CC so keep this a !! 913 # We'll want to enable this eventually, but it's not going away for 5.7 at least
985 NOSTDINC_FLAGS += -nostdinc !! 914 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
>> 915 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
>> 916 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
>> 917
>> 918 # Another good warning that we'll want to enable eventually
>> 919 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
986 920
987 # To gain proper coverage for CONFIG_UBSAN_BOU !! 921 # Enabled with W=2, disabled by default as noisy
988 # the kernel uses only C99 flexible arrays for !! 922 KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
989 # arrays. Enforce this for everything that may <<
990 # perform bounds checking. <<
991 KBUILD_CFLAGS += $(call cc-option, -fstrict-fl <<
992 <<
993 #Currently, disable -Wstringop-overflow for GC <<
994 KBUILD_CFLAGS-$(CONFIG_CC_NO_STRINGOP_OVERFLOW <<
995 KBUILD_CFLAGS-$(CONFIG_CC_STRINGOP_OVERFLOW) + <<
996 923
997 # disable invalid "can't wrap" optimizations f 924 # disable invalid "can't wrap" optimizations for signed / pointers
998 KBUILD_CFLAGS += -fno-strict-overflow !! 925 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
>> 926
>> 927 # clang sets -fmerge-all-constants by default as optimization, but this
>> 928 # is non-conforming behavior for C and in fact breaks the kernel, so we
>> 929 # need to disable it here generally.
>> 930 KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants)
>> 931
>> 932 # for gcc -fno-merge-all-constants disables everything, but it is fine
>> 933 # to have actual conforming behavior enabled.
>> 934 KBUILD_CFLAGS += $(call cc-option,-fmerge-constants)
999 935
1000 # Make sure -fstack-check isn't enabled (like 936 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
1001 KBUILD_CFLAGS += -fno-stack-check !! 937 KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,)
1002 938
1003 # conserve stack if available 939 # conserve stack if available
1004 ifdef CONFIG_CC_IS_GCC !! 940 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
1005 KBUILD_CFLAGS += -fconserve-stack !! 941
1006 endif !! 942 # Prohibit date/time macros, which would make the build non-deterministic
>> 943 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
>> 944
>> 945 # enforce correct pointer usage
>> 946 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
>> 947
>> 948 # Require designated initializers for all marked structures
>> 949 KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
1007 950
1008 # change __FILE__ to the relative path from t 951 # change __FILE__ to the relative path from the srctree
1009 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-p !! 952 KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
>> 953
>> 954 # ensure -fcf-protection is disabled when using retpoline as it is
>> 955 # incompatible with -mindirect-branch=thunk-extern
>> 956 ifdef CONFIG_RETPOLINE
>> 957 KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
>> 958 endif
1010 959
1011 # include additional Makefiles when needed 960 # include additional Makefiles when needed
1012 include-y := scripts/Ma 961 include-y := scripts/Makefile.extrawarn
1013 include-$(CONFIG_DEBUG_INFO) += scripts/Ma <<
1014 include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Ma <<
1015 include-$(CONFIG_KASAN) += scripts/Ma 962 include-$(CONFIG_KASAN) += scripts/Makefile.kasan
1016 include-$(CONFIG_KCSAN) += scripts/Ma 963 include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan
1017 include-$(CONFIG_KMSAN) += scripts/Ma <<
1018 include-$(CONFIG_UBSAN) += scripts/Ma 964 include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan
1019 include-$(CONFIG_KCOV) += scripts/Ma 965 include-$(CONFIG_KCOV) += scripts/Makefile.kcov
1020 include-$(CONFIG_RANDSTRUCT) += scripts/Ma <<
1021 include-$(CONFIG_GCC_PLUGINS) += scripts/Ma 966 include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins
1022 967
1023 include $(addprefix $(srctree)/, $(include-y) 968 include $(addprefix $(srctree)/, $(include-y))
1024 969
1025 # scripts/Makefile.gcc-plugins is intentional 970 # scripts/Makefile.gcc-plugins is intentionally included last.
1026 # Do not add $(call cc-option,...) below this 971 # Do not add $(call cc-option,...) below this line. When you build the kernel
1027 # from the clean source tree, the GCC plugins 972 # from the clean source tree, the GCC plugins do not exist at this point.
1028 973
1029 # Add user supplied CPPFLAGS, AFLAGS, CFLAGS !! 974 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
1030 KBUILD_CPPFLAGS += $(KCPPFLAGS) 975 KBUILD_CPPFLAGS += $(KCPPFLAGS)
1031 KBUILD_AFLAGS += $(KAFLAGS) 976 KBUILD_AFLAGS += $(KAFLAGS)
1032 KBUILD_CFLAGS += $(KCFLAGS) 977 KBUILD_CFLAGS += $(KCFLAGS)
1033 KBUILD_RUSTFLAGS += $(KRUSTFLAGS) <<
1034 978
1035 KBUILD_LDFLAGS_MODULE += --build-id=sha1 979 KBUILD_LDFLAGS_MODULE += --build-id=sha1
1036 LDFLAGS_vmlinux += --build-id=sha1 980 LDFLAGS_vmlinux += --build-id=sha1
1037 981
1038 KBUILD_LDFLAGS += -z noexecstack <<
1039 ifeq ($(CONFIG_LD_IS_BFD),y) <<
1040 KBUILD_LDFLAGS += $(call ld-option,--no-warn <<
1041 endif <<
1042 <<
1043 ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 982 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
1044 LDFLAGS_vmlinux += -X !! 983 LDFLAGS_vmlinux += $(call ld-option, -X,)
1045 endif 984 endif
1046 985
1047 ifeq ($(CONFIG_RELR),y) 986 ifeq ($(CONFIG_RELR),y)
1048 # ld.lld before 15 did not support -z pack-re !! 987 LDFLAGS_vmlinux += --pack-dyn-relocs=relr
1049 LDFLAGS_vmlinux += $(call ld-option,--pack-dy <<
1050 endif <<
1051 <<
1052 # We never want expected sections to be place <<
1053 # linker. All sections should be explicitly n <<
1054 ifdef CONFIG_LD_ORPHAN_WARN <<
1055 LDFLAGS_vmlinux += --orphan-handling=$(CONFIG <<
1056 endif 988 endif
1057 989
1058 # Align the bit size of userspace programs wi 990 # Align the bit size of userspace programs with the kernel
1059 KBUILD_USERCFLAGS += $(filter -m32 -m64 --ta 991 KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1060 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --ta 992 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1061 993
1062 # make the checker run with the right archite 994 # make the checker run with the right architecture
1063 CHECKFLAGS += --arch=$(ARCH) 995 CHECKFLAGS += --arch=$(ARCH)
1064 996
1065 # insure the checker run with the right endia 997 # insure the checker run with the right endianness
1066 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),- 998 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1067 999
1068 # the checker needs the correct machine size 1000 # the checker needs the correct machine size
1069 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1001 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1070 1002
1071 # Default kernel image to build when no speci 1003 # Default kernel image to build when no specific target is given.
1072 # KBUILD_IMAGE may be overruled on the comman 1004 # KBUILD_IMAGE may be overruled on the command line or
1073 # set in the environment 1005 # set in the environment
1074 # Also any assignments in arch/$(ARCH)/Makefi 1006 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1075 # this default value 1007 # this default value
1076 export KBUILD_IMAGE ?= vmlinux 1008 export KBUILD_IMAGE ?= vmlinux
1077 1009
1078 # 1010 #
1079 # INSTALL_PATH specifies where to place the u 1011 # INSTALL_PATH specifies where to place the updated kernel and system map
1080 # images. Default is /boot, but you can set i 1012 # images. Default is /boot, but you can set it to other values
1081 export INSTALL_PATH ?= /boot 1013 export INSTALL_PATH ?= /boot
1082 1014
1083 # 1015 #
1084 # INSTALL_DTBS_PATH specifies a prefix for re 1016 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1085 # Like INSTALL_MOD_PATH, it isn't defined in 1017 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1086 # an argument if needed. Otherwise it default 1018 # an argument if needed. Otherwise it defaults to the kernel install path
1087 # 1019 #
1088 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/d 1020 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1089 1021
1090 # 1022 #
1091 # INSTALL_MOD_PATH specifies a prefix to MODL 1023 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1092 # relocations required by build roots. This 1024 # relocations required by build roots. This is not defined in the
1093 # makefile but the argument can be passed to 1025 # makefile but the argument can be passed to make if needed.
1094 # 1026 #
1095 1027
1096 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(K 1028 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1097 export MODLIB 1029 export MODLIB
1098 1030
>> 1031 #
>> 1032 # INSTALL_MOD_STRIP, if defined, will cause modules to be
>> 1033 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
>> 1034 # the default option --strip-debug will be used. Otherwise,
>> 1035 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
>> 1036
>> 1037 ifdef INSTALL_MOD_STRIP
>> 1038 ifeq ($(INSTALL_MOD_STRIP),1)
>> 1039 mod_strip_cmd = $(STRIP) --strip-debug
>> 1040 else
>> 1041 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
>> 1042 endif # INSTALL_MOD_STRIP=1
>> 1043 else
>> 1044 mod_strip_cmd = true
>> 1045 endif # INSTALL_MOD_STRIP
>> 1046 export mod_strip_cmd
>> 1047
>> 1048 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
>> 1049 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
>> 1050 # or CONFIG_MODULE_COMPRESS_XZ.
>> 1051
>> 1052 mod_compress_cmd = true
>> 1053 ifdef CONFIG_MODULE_COMPRESS
>> 1054 ifdef CONFIG_MODULE_COMPRESS_GZIP
>> 1055 mod_compress_cmd = $(KGZIP) -n -f
>> 1056 endif # CONFIG_MODULE_COMPRESS_GZIP
>> 1057 ifdef CONFIG_MODULE_COMPRESS_XZ
>> 1058 mod_compress_cmd = $(XZ) -f
>> 1059 endif # CONFIG_MODULE_COMPRESS_XZ
>> 1060 endif # CONFIG_MODULE_COMPRESS
>> 1061 export mod_compress_cmd
>> 1062
>> 1063 ifdef CONFIG_MODULE_SIG_ALL
>> 1064 $(eval $(call config_filename,MODULE_SIG_KEY))
>> 1065
>> 1066 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
>> 1067 else
>> 1068 mod_sign_cmd = true
>> 1069 endif
>> 1070 export mod_sign_cmd
>> 1071
>> 1072 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
>> 1073
>> 1074 has_libelf = $(call try-run,\
>> 1075 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
>> 1076
>> 1077 ifdef CONFIG_STACK_VALIDATION
>> 1078 ifeq ($(has_libelf),1)
>> 1079 objtool_target := tools/objtool FORCE
>> 1080 else
>> 1081 SKIP_STACK_VALIDATION := 1
>> 1082 export SKIP_STACK_VALIDATION
>> 1083 endif
>> 1084 endif
>> 1085
>> 1086 ifdef CONFIG_DEBUG_INFO_BTF
>> 1087 ifeq ($(has_libelf),1)
>> 1088 resolve_btfids_target := tools/bpf/resolve_btfids FORCE
>> 1089 else
>> 1090 ERROR_RESOLVE_BTFIDS := 1
>> 1091 endif
>> 1092 endif
>> 1093
1099 PHONY += prepare0 1094 PHONY += prepare0
1100 1095
1101 export extmod_prefix = $(if $(KBUILD_EXTMOD), !! 1096 export MODORDER := $(extmod-prefix)modules.order
1102 export MODORDER := $(extmod_prefix)modules.or !! 1097 export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
1103 export MODULES_NSDEPS := $(extmod_prefix)modu <<
1104 1098
1105 ifeq ($(KBUILD_EXTMOD),) 1099 ifeq ($(KBUILD_EXTMOD),)
>> 1100 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1106 1101
1107 build-dir := . !! 1102 vmlinux-dirs := $(patsubst %/,%,$(filter %/, \
1108 clean-dirs := $(sort . Documentation \ !! 1103 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
>> 1104 $(libs-y) $(libs-m)))
>> 1105
>> 1106 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1109 $(patsubst %/,%,$(filter 1107 $(patsubst %/,%,$(filter %/, $(core-) \
1110 $(drivers-) $(libs-)) 1108 $(drivers-) $(libs-))))
1111 1109
1112 export ARCH_CORE := $(core-y) !! 1110 subdir-modorder := $(addsuffix modules.order,$(filter %/, \
1113 export ARCH_LIB := $(filter %/, $(lib !! 1111 $(core-y) $(core-m) $(libs-y) $(libs-m) \
1114 export ARCH_DRIVERS := $(drivers-y) $(dri !! 1112 $(drivers-y) $(drivers-m)))
1115 # Externally visible symbols (used by link-vm !! 1113
>> 1114 build-dirs := $(vmlinux-dirs)
>> 1115 clean-dirs := $(vmlinux-alldirs)
1116 1116
1117 KBUILD_VMLINUX_OBJS := ./built-in.a !! 1117 # Externally visible symbols (used by link-vmlinux.sh)
>> 1118 KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y))
>> 1119 KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
1118 ifdef CONFIG_MODULES 1120 ifdef CONFIG_MODULES
1119 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a 1121 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1120 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(lib 1122 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1121 else 1123 else
1122 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, 1124 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1123 endif 1125 endif
>> 1126 KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
1124 1127
1125 export KBUILD_VMLINUX_LIBS !! 1128 export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1126 export KBUILD_LDS := arch/$(SRCARCH) 1129 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
>> 1130 # used by scripts/Makefile.package
>> 1131 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
>> 1132
>> 1133 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1127 1134
>> 1135 # Recurse until adjust_autoksyms.sh is satisfied
>> 1136 PHONY += autoksyms_recursive
1128 ifdef CONFIG_TRIM_UNUSED_KSYMS 1137 ifdef CONFIG_TRIM_UNUSED_KSYMS
1129 # For the kernel to actually contain only the 1138 # For the kernel to actually contain only the needed exported symbols,
1130 # we have to build modules as well to determi 1139 # we have to build modules as well to determine what those symbols are.
>> 1140 # (this can be evaluated only once include/config/auto.conf has been included)
1131 KBUILD_MODULES := 1 1141 KBUILD_MODULES := 1
>> 1142
>> 1143 autoksyms_recursive: descend modules.order
>> 1144 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
>> 1145 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1132 endif 1146 endif
1133 1147
1134 # '$(AR) mPi' needs 'T' to workaround the bug !! 1148 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 1149
1149 vmlinux.o modules.builtin.modinfo modules.bui !! 1150 quiet_cmd_autoksyms_h = GEN $@
1150 @: !! 1151 cmd_autoksyms_h = mkdir -p $(dir $@); \
>> 1152 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
>> 1153
>> 1154 $(autoksyms_h):
>> 1155 $(call cmd,autoksyms_h)
>> 1156
>> 1157 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1151 1158
1152 PHONY += vmlinux !! 1159 # Final link of vmlinux with optional arch pass after final link
1153 # LDFLAGS_vmlinux in the top Makefile defines !! 1160 cmd_link-vmlinux = \
1154 # not for decompressors. LDFLAGS_vmlinux in a !! 1161 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \
1155 # unrelated; the decompressors just happen to !! 1162 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1156 # arch/*/boot/compressed/vmlinux. !! 1163
1157 # Export LDFLAGS_vmlinux only to scripts/Make !! 1164 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1158 # !! 1165 +$(call if_changed,link-vmlinux)
1159 # _LDFLAGS_vmlinux is a workaround for the 'p !! 1166
1160 # https://savannah.gnu.org/bugs/?61463 !! 1167 targets := vmlinux
1161 # For Make > 4.4, the following simple code w <<
1162 # vmlinux: private export LDFLAGS_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 1168
1168 # The actual objects are generated when desce 1169 # The actual objects are generated when descending,
1169 # make sure no implicit rule kicks in 1170 # make sure no implicit rule kicks in
1170 $(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $ !! 1171 $(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
1171 1172
1172 ifeq ($(origin KERNELRELEASE),file) !! 1173 filechk_kernel.release = \
1173 filechk_kernel.release = $(srctree)/scripts/s !! 1174 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1174 else <<
1175 filechk_kernel.release = echo $(KERNELRELEASE <<
1176 endif <<
1177 1175
1178 # Store (new) KERNELRELEASE string in include 1176 # Store (new) KERNELRELEASE string in include/config/kernel.release
1179 include/config/kernel.release: FORCE 1177 include/config/kernel.release: FORCE
1180 $(call filechk,kernel.release) 1178 $(call filechk,kernel.release)
1181 1179
1182 # Additional helpers built in scripts/ 1180 # Additional helpers built in scripts/
1183 # Carefully list dependencies so we do not tr 1181 # Carefully list dependencies so we do not try to build scripts twice
1184 # in parallel 1182 # in parallel
1185 PHONY += scripts 1183 PHONY += scripts
1186 scripts: scripts_basic scripts_dtc 1184 scripts: scripts_basic scripts_dtc
1187 $(Q)$(MAKE) $(build)=$(@) 1185 $(Q)$(MAKE) $(build)=$(@)
1188 1186
1189 # Things we need to do before we recursively 1187 # Things we need to do before we recursively start building the kernel
1190 # or the modules are listed in "prepare". 1188 # or the modules are listed in "prepare".
1191 # A multi level approach is used. prepareN is 1189 # A multi level approach is used. prepareN is processed before prepareN-1.
1192 # archprepare is used in arch Makefiles and w 1190 # archprepare is used in arch Makefiles and when processed asm symlink,
1193 # version.h and scripts_basic is processed / 1191 # version.h and scripts_basic is processed / created.
1194 1192
1195 PHONY += prepare archprepare 1193 PHONY += prepare archprepare
1196 1194
1197 archprepare: outputmakefile archheaders archs 1195 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1198 asm-generic $(version_h) include/gene !! 1196 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1199 include/generated/compile.h include/g !! 1197 include/generated/autoconf.h
1200 1198
1201 prepare0: archprepare 1199 prepare0: archprepare
1202 $(Q)$(MAKE) $(build)=scripts/mod 1200 $(Q)$(MAKE) $(build)=scripts/mod
1203 $(Q)$(MAKE) $(build)=. prepare !! 1201 $(Q)$(MAKE) $(build)=.
1204 1202
1205 # All the preparing.. 1203 # All the preparing..
1206 prepare: prepare0 !! 1204 prepare: prepare0 prepare-objtool prepare-resolve_btfids
1207 ifdef CONFIG_RUST <<
1208 +$(Q)$(CONFIG_SHELL) $(srctree)/scrip <<
1209 $(Q)$(MAKE) $(build)=rust <<
1210 endif <<
1211 <<
1212 PHONY += remove-stale-files <<
1213 remove-stale-files: <<
1214 $(Q)$(srctree)/scripts/remove-stale-f <<
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
>> 1217 PHONY += prepare-objtool prepare-resolve_btfids
>> 1218 prepare-objtool: $(objtool_target)
>> 1219 ifeq ($(SKIP_STACK_VALIDATION),1)
>> 1220 ifdef CONFIG_UNWINDER_ORC
>> 1221 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
>> 1222 @false
>> 1223 else
>> 1224 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
>> 1225 endif
>> 1226 endif
>> 1227
>> 1228 prepare-resolve_btfids: $(resolve_btfids_target)
>> 1229 ifeq ($(ERROR_RESOLVE_BTFIDS),1)
>> 1230 @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
>> 1231 @false
>> 1232 endif
1227 # Generate some files 1233 # Generate some files
1228 # ------------------------------------------- 1234 # ---------------------------------------------------------------------------
1229 1235
1230 # KERNELRELEASE can change from a few differe 1236 # KERNELRELEASE can change from a few different places, meaning version.h
1231 # needs to be updated, so this check is force 1237 # needs to be updated, so this check is forced on all builds
1232 1238
1233 uts_len := 64 1239 uts_len := 64
1234 define filechk_utsrelease.h 1240 define filechk_utsrelease.h
1235 if [ `echo -n "$(KERNELRELEASE)" | wc 1241 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1236 echo '"$(KERNELRELEASE)" exceeds $( 1242 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1237 exit 1; 1243 exit 1; \
1238 fi; 1244 fi; \
1239 echo \#define UTS_RELEASE \"$(KERNELR 1245 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1240 endef 1246 endef
1241 1247
1242 define filechk_version.h 1248 define filechk_version.h
1243 if [ $(SUBLEVEL) -gt 255 ]; then !! 1249 echo \#define LINUX_VERSION_CODE $(shell \
1244 echo \#define LINUX_VERSION_C !! 1250 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1245 expr $(VERSION) \* 65536 + $( !! 1251 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1246 else <<
1247 echo \#define LINUX_VERSION_C <<
1248 expr $(VERSION) \* 65536 + $( <<
1249 fi; <<
1250 echo '#define KERNEL_VERSION(a,b,c) ( <<
1251 ((c) > 255 ? 255 : (c)))'; <<
1252 echo \#define LINUX_VERSION_MAJOR $(V <<
1253 echo \#define LINUX_VERSION_PATCHLEVE <<
1254 echo \#define LINUX_VERSION_SUBLEVEL <<
1255 endef 1252 endef
1256 1253
1257 $(version_h): private PATCHLEVEL := $(or $(PA <<
1258 $(version_h): private SUBLEVEL := $(or $(SUBL <<
1259 $(version_h): FORCE 1254 $(version_h): FORCE
1260 $(call filechk,version.h) 1255 $(call filechk,version.h)
>> 1256 $(Q)rm -f $(old_version_h)
1261 1257
1262 include/generated/utsrelease.h: include/confi 1258 include/generated/utsrelease.h: include/config/kernel.release FORCE
1263 $(call filechk,utsrelease.h) 1259 $(call filechk,utsrelease.h)
1264 1260
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 1261 PHONY += headerdep
1272 headerdep: 1262 headerdep:
1273 $(Q)find $(srctree)/include/ -name '* 1263 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1274 $(srctree)/scripts/headerdep.pl -I$(s 1264 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1275 1265
1276 # ------------------------------------------- 1266 # ---------------------------------------------------------------------------
1277 # Kernel headers 1267 # Kernel headers
1278 1268
1279 #Default location for installed headers 1269 #Default location for installed headers
1280 export INSTALL_HDR_PATH = $(objtree)/usr 1270 export INSTALL_HDR_PATH = $(objtree)/usr
1281 1271
1282 quiet_cmd_headers_install = INSTALL $(INSTALL 1272 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1283 cmd_headers_install = \ 1273 cmd_headers_install = \
1284 mkdir -p $(INSTALL_HDR_PATH); \ 1274 mkdir -p $(INSTALL_HDR_PATH); \
1285 rsync -mrl --include='*/' --include=' 1275 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1286 usr/include $(INSTALL_HDR_PATH) 1276 usr/include $(INSTALL_HDR_PATH)
1287 1277
1288 PHONY += headers_install 1278 PHONY += headers_install
1289 headers_install: headers 1279 headers_install: headers
1290 $(call cmd,headers_install) 1280 $(call cmd,headers_install)
1291 1281
1292 PHONY += archheaders archscripts 1282 PHONY += archheaders archscripts
1293 1283
1294 hdr-inst := -f $(srctree)/scripts/Makefile.he 1284 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1295 1285
1296 PHONY += headers 1286 PHONY += headers
1297 headers: $(version_h) scripts_unifdef uapi-as 1287 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1298 $(if $(filter um, $(SRCARCH)), $(erro !! 1288 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
>> 1289 $(error Headers not exportable for the $(SRCARCH) architecture))
1299 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1290 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1300 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARC 1291 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1301 1292
>> 1293 # Deprecated. It is no-op now.
>> 1294 PHONY += headers_check
>> 1295 headers_check:
>> 1296 @:
>> 1297
1302 ifdef CONFIG_HEADERS_INSTALL 1298 ifdef CONFIG_HEADERS_INSTALL
1303 prepare: headers 1299 prepare: headers
1304 endif 1300 endif
1305 1301
1306 PHONY += scripts_unifdef 1302 PHONY += scripts_unifdef
1307 scripts_unifdef: scripts_basic 1303 scripts_unifdef: scripts_basic
1308 $(Q)$(MAKE) $(build)=scripts scripts/ 1304 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1309 1305
1310 # ------------------------------------------- 1306 # ---------------------------------------------------------------------------
1311 # Install <<
1312 <<
1313 # Many distributions have the custom install <<
1314 # If DKMS is installed, 'make install' will e <<
1315 # to this Makefile to build and install exter <<
1316 # Cancel sub_make_done so that options such a <<
1317 <<
1318 quiet_cmd_install = INSTALL $(INSTALL_PATH) <<
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 <<
1329 # ------------------------------------------- <<
1330 # Tools <<
1331 <<
1332 ifdef CONFIG_OBJTOOL <<
1333 prepare: tools/objtool <<
1334 endif <<
1335 <<
1336 ifdef CONFIG_BPF <<
1337 ifdef CONFIG_DEBUG_INFO_BTF <<
1338 prepare: tools/bpf/resolve_btfids <<
1339 endif <<
1340 endif <<
1341 <<
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 <<
1349 <<
1350 resolve_btfids_O = $(abspath $(objtree))/tool <<
1351 <<
1352 # tools/bpf/resolve_btfids directory might no <<
1353 # in output directory, skip its clean in that <<
1354 resolve_btfids_clean: <<
1355 ifneq ($(wildcard $(resolve_btfids_O)),) <<
1356 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/ <<
1357 endif <<
1358 <<
1359 # Clear a bunch of variables before executing <<
1360 ifeq ($(quiet),silent_) <<
1361 tools_silent=s <<
1362 endif <<
1363 <<
1364 tools/: FORCE <<
1365 $(Q)mkdir -p $(objtree)/tools <<
1366 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(too <<
1367 <<
1368 tools/%: FORCE <<
1369 $(Q)mkdir -p $(objtree)/tools <<
1370 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(too <<
1371 <<
1372 # ------------------------------------------- <<
1373 # Kernel selftest 1307 # Kernel selftest
1374 1308
1375 PHONY += kselftest 1309 PHONY += kselftest
1376 kselftest: headers !! 1310 kselftest:
1377 $(Q)$(MAKE) -C $(srctree)/tools/testi 1311 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1378 1312
1379 kselftest-%: headers FORCE !! 1313 kselftest-%: FORCE
1380 $(Q)$(MAKE) -C $(srctree)/tools/testi 1314 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1381 1315
1382 PHONY += kselftest-merge 1316 PHONY += kselftest-merge
1383 kselftest-merge: 1317 kselftest-merge:
1384 $(if $(wildcard $(objtree)/.config),, 1318 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1385 $(Q)find $(srctree)/tools/testing/sel !! 1319 $(Q)find $(srctree)/tools/testing/selftests -name config | \
1386 xargs $(srctree)/scripts/kcon !! 1320 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1387 $(Q)$(MAKE) -f $(srctree)/Makefile ol 1321 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1388 1322
1389 # ------------------------------------------- 1323 # ---------------------------------------------------------------------------
1390 # Devicetree files 1324 # Devicetree files
1391 1325
1392 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/ 1326 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1393 dtstree := arch/$(SRCARCH)/boot/dts 1327 dtstree := arch/$(SRCARCH)/boot/dts
1394 endif 1328 endif
1395 1329
1396 ifneq ($(dtstree),) 1330 ifneq ($(dtstree),)
1397 1331
1398 %.dtb: dtbs_prepare !! 1332 %.dtb: include/config/kernel.release scripts_dtc
1399 $(Q)$(MAKE) $(build)=$(dtstree) $(dts <<
1400 <<
1401 %.dtbo: dtbs_prepare <<
1402 $(Q)$(MAKE) $(build)=$(dtstree) $(dts 1333 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1403 1334
1404 PHONY += dtbs dtbs_prepare dtbs_install dtbs_ !! 1335 PHONY += dtbs dtbs_install dtbs_check
1405 dtbs: dtbs_prepare !! 1336 dtbs: include/config/kernel.release scripts_dtc
1406 $(Q)$(MAKE) $(build)=$(dtstree) need- !! 1337 $(Q)$(MAKE) $(build)=$(dtstree)
1407 <<
1408 # include/config/kernel.release is actually n <<
1409 # INSTALL_DTBS_PATH contains $(KERNELRELEASE) <<
1410 # dtbs_install depend on it as dtbs_install m <<
1411 dtbs_prepare: include/config/kernel.release s <<
1412 1338
1413 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)), 1339 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1414 export CHECK_DTBS=y 1340 export CHECK_DTBS=y
1415 endif !! 1341 dtbs: dt_binding_check
1416 <<
1417 ifneq ($(CHECK_DTBS),) <<
1418 dtbs_prepare: dt_binding_schemas <<
1419 endif 1342 endif
1420 1343
1421 dtbs_check: dtbs 1344 dtbs_check: dtbs
1422 1345
1423 dtbs_install: 1346 dtbs_install:
1424 $(Q)$(MAKE) -f $(srctree)/scripts/Mak !! 1347 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1425 1348
1426 ifdef CONFIG_OF_EARLY_FLATTREE 1349 ifdef CONFIG_OF_EARLY_FLATTREE
1427 all: dtbs 1350 all: dtbs
1428 endif 1351 endif
1429 1352
1430 endif 1353 endif
1431 1354
1432 PHONY += scripts_dtc 1355 PHONY += scripts_dtc
1433 scripts_dtc: scripts_basic 1356 scripts_dtc: scripts_basic
1434 $(Q)$(MAKE) $(build)=scripts/dtc 1357 $(Q)$(MAKE) $(build)=scripts/dtc
1435 1358
1436 ifneq ($(filter dt_binding_check, $(MAKECMDGO 1359 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1437 export CHECK_DTBS=y !! 1360 export CHECK_DT_BINDING=y
1438 endif 1361 endif
1439 1362
1440 PHONY += dt_binding_check dt_binding_schemas !! 1363 PHONY += dt_binding_check
1441 dt_binding_check: dt_binding_schemas scripts_ !! 1364 dt_binding_check: scripts_dtc
1442 $(Q)$(MAKE) $(build)=Documentation/de <<
1443 <<
1444 dt_binding_schemas: <<
1445 $(Q)$(MAKE) $(build)=Documentation/de 1365 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1446 1366
1447 PHONY += dt_compatible_check <<
1448 dt_compatible_check: dt_binding_schemas <<
1449 $(Q)$(MAKE) $(build)=Documentation/de <<
1450 <<
1451 # ------------------------------------------- 1367 # ---------------------------------------------------------------------------
1452 # Modules 1368 # Modules
1453 1369
1454 ifdef CONFIG_MODULES 1370 ifdef CONFIG_MODULES
1455 1371
1456 # By default, build modules as well 1372 # By default, build modules as well
1457 1373
1458 all: modules 1374 all: modules
1459 1375
1460 # When we're building modules with modversion 1376 # When we're building modules with modversions, we need to consider
1461 # the built-in objects during the descend as 1377 # the built-in objects during the descend as well, in order to
1462 # make sure the checksums are up to date befo 1378 # make sure the checksums are up to date before we record them.
1463 ifdef CONFIG_MODVERSIONS 1379 ifdef CONFIG_MODVERSIONS
1464 KBUILD_BUILTIN := 1 1380 KBUILD_BUILTIN := 1
1465 endif 1381 endif
1466 1382
1467 # Build modules 1383 # Build modules
1468 # 1384 #
>> 1385 # A module can be listed more than once in obj-m resulting in
>> 1386 # duplicate lines in modules.order files. Those are removed
>> 1387 # using awk while concatenating to the final file.
1469 1388
1470 # *.ko are usually independent of vmlinux, bu !! 1389 PHONY += modules
1471 # is an exception. !! 1390 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check
1472 ifdef CONFIG_DEBUG_INFO_BTF_MODULES !! 1391 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1473 KBUILD_BUILTIN := 1 !! 1392
1474 modules: vmlinux !! 1393 PHONY += modules_check
1475 endif !! 1394 modules_check: modules.order
>> 1395 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1476 1396
1477 modules: modules_prepare !! 1397 cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@
>> 1398
>> 1399 modules.order: $(subdir-modorder) FORCE
>> 1400 $(call if_changed,modules_order)
>> 1401
>> 1402 targets += modules.order
1478 1403
1479 # Target to prepare building external modules 1404 # Target to prepare building external modules
>> 1405 PHONY += modules_prepare
1480 modules_prepare: prepare 1406 modules_prepare: prepare
1481 $(Q)$(MAKE) $(build)=scripts scripts/ !! 1407
>> 1408 # Target to install modules
>> 1409 PHONY += modules_install
>> 1410 modules_install: _modinst_ _modinst_post
>> 1411
>> 1412 PHONY += _modinst_
>> 1413 _modinst_:
>> 1414 @rm -rf $(MODLIB)/kernel
>> 1415 @rm -f $(MODLIB)/source
>> 1416 @mkdir -p $(MODLIB)/kernel
>> 1417 @ln -s $(abspath $(srctree)) $(MODLIB)/source
>> 1418 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
>> 1419 rm -f $(MODLIB)/build ; \
>> 1420 ln -s $(CURDIR) $(MODLIB)/build ; \
>> 1421 fi
>> 1422 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
>> 1423 @cp -f modules.builtin $(MODLIB)/
>> 1424 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
>> 1425 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
>> 1426
>> 1427 # This depmod is only for convenience to give the initial
>> 1428 # boot a modules.dep even before / is mounted read-write. However the
>> 1429 # boot script depmod is the master version.
>> 1430 PHONY += _modinst_post
>> 1431 _modinst_post: _modinst_
>> 1432 $(call cmd,depmod)
>> 1433
>> 1434 ifeq ($(CONFIG_MODULE_SIG), y)
>> 1435 PHONY += modules_sign
>> 1436 modules_sign:
>> 1437 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
>> 1438 endif
>> 1439
>> 1440 else # CONFIG_MODULES
>> 1441
>> 1442 # Modules not configured
>> 1443 # ---------------------------------------------------------------------------
>> 1444
>> 1445 PHONY += modules modules_install
>> 1446 modules modules_install:
>> 1447 @echo >&2
>> 1448 @echo >&2 "The present kernel configuration has modules disabled."
>> 1449 @echo >&2 "Type 'make config' and enable loadable module support."
>> 1450 @echo >&2 "Then build a kernel with module support enabled."
>> 1451 @echo >&2
>> 1452 @exit 1
1482 1453
1483 endif # CONFIG_MODULES 1454 endif # CONFIG_MODULES
1484 1455
1485 ### 1456 ###
1486 # Cleaning is done on three levels. 1457 # Cleaning is done on three levels.
1487 # make clean Delete most generated files 1458 # make clean Delete most generated files
1488 # Leave enough to build extern 1459 # Leave enough to build external modules
1489 # make mrproper Delete the current configura 1460 # make mrproper Delete the current configuration, and all generated files
1490 # make distclean Remove editor backup files, 1461 # make distclean Remove editor backup files, patch leftover files and the like
1491 1462
1492 # Directories & files removed with 'make clea 1463 # Directories & files removed with 'make clean'
1493 CLEAN_FILES += vmlinux.symvers modules-only.s !! 1464 CLEAN_FILES += include/ksym vmlinux.symvers \
1494 modules.builtin modules.builti !! 1465 modules.builtin modules.builtin.modinfo modules.nsdeps
1495 modules.builtin.ranges vmlinux <<
1496 compile_commands.json rust/tes <<
1497 rust-project.json .vmlinux.obj <<
1498 1466
1499 # Directories & files removed with 'make mrpr 1467 # Directories & files removed with 'make mrproper'
1500 MRPROPER_FILES += include/config include/gene 1468 MRPROPER_FILES += include/config include/generated \
1501 arch/$(SRCARCH)/include/gen !! 1469 arch/$(SRCARCH)/include/generated .tmp_objdiff \
1502 debian snap tar-install PKG !! 1470 debian snap tar-install \
1503 .config .config.old .versio 1471 .config .config.old .version \
1504 Module.symvers \ 1472 Module.symvers \
1505 certs/signing_key.pem \ !! 1473 signing_key.pem signing_key.priv signing_key.x509 \
1506 certs/x509.genkey \ !! 1474 x509.genkey extra_certificates signing_key.x509.keyid \
1507 vmlinux-gdb.py \ !! 1475 signing_key.x509.signer vmlinux-gdb.py \
1508 rpmbuild \ !! 1476 *.spec
1509 rust/libmacros.so !! 1477
>> 1478 # Directories & files removed with 'make distclean'
>> 1479 DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1510 1480
1511 # clean - Delete most, but leave enough to bu 1481 # clean - Delete most, but leave enough to build external modules
1512 # 1482 #
1513 clean: private rm-files := $(CLEAN_FILES) !! 1483 clean: rm-files := $(CLEAN_FILES)
1514 1484
1515 PHONY += archclean vmlinuxclean 1485 PHONY += archclean vmlinuxclean
1516 1486
1517 vmlinuxclean: 1487 vmlinuxclean:
1518 $(Q)$(CONFIG_SHELL) $(srctree)/script 1488 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1519 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f 1489 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1520 1490
1521 clean: archclean vmlinuxclean resolve_btfids_ !! 1491 clean: archclean vmlinuxclean
1522 1492
1523 # mrproper - Delete all generated files, incl 1493 # mrproper - Delete all generated files, including .config
1524 # 1494 #
1525 mrproper: private rm-files := $(MRPROPER_FILE !! 1495 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1526 mrproper-dirs := $(addprefix _mrproper_, 1496 mrproper-dirs := $(addprefix _mrproper_,scripts)
1527 1497
1528 PHONY += $(mrproper-dirs) mrproper 1498 PHONY += $(mrproper-dirs) mrproper
1529 $(mrproper-dirs): 1499 $(mrproper-dirs):
1530 $(Q)$(MAKE) $(clean)=$(patsubst _mrpr 1500 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1531 1501
1532 mrproper: clean $(mrproper-dirs) 1502 mrproper: clean $(mrproper-dirs)
1533 $(call cmd,rmfiles) 1503 $(call cmd,rmfiles)
1534 @find . $(RCS_FIND_IGNORE) \ <<
1535 \( -name '*.rmeta' \) \ <<
1536 -type f -print | xargs rm -f <<
1537 1504
1538 # distclean 1505 # distclean
1539 # 1506 #
>> 1507 distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
>> 1508
1540 PHONY += distclean 1509 PHONY += distclean
1541 1510
1542 distclean: mrproper 1511 distclean: mrproper
1543 @find . $(RCS_FIND_IGNORE) \ !! 1512 $(call cmd,rmfiles)
>> 1513 @find $(srctree) $(RCS_FIND_IGNORE) \
1544 \( -name '*.orig' -o -name '* 1514 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1545 -o -name '*.bak' -o -name '#* 1515 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1546 -o -name 'core' -o -name tags !! 1516 -o -name 'core' \) \
1547 -o -name GPATH -o -name GRTAG <<
1548 -type f -print | xargs rm -f 1517 -type f -print | xargs rm -f
1549 1518
1550 1519
1551 # Packaging of the kernel to various formats 1520 # Packaging of the kernel to various formats
1552 # ------------------------------------------- 1521 # ---------------------------------------------------------------------------
1553 1522
1554 %src-pkg: FORCE 1523 %src-pkg: FORCE
1555 $(Q)$(MAKE) -f $(srctree)/scripts/Mak 1524 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1556 %pkg: include/config/kernel.release FORCE 1525 %pkg: include/config/kernel.release FORCE
1557 $(Q)$(MAKE) -f $(srctree)/scripts/Mak 1526 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1558 1527
1559 # Brief documentation of the typical targets 1528 # Brief documentation of the typical targets used
1560 # ------------------------------------------- 1529 # ---------------------------------------------------------------------------
1561 1530
1562 boards := $(wildcard $(srctree)/arch/$(SRCARC 1531 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1563 boards := $(sort $(notdir $(boards))) 1532 boards := $(sort $(notdir $(boards)))
1564 board-dirs := $(dir $(wildcard $(srctree)/arc 1533 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1565 board-dirs := $(sort $(notdir $(board-dirs:/= 1534 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1566 1535
1567 PHONY += help 1536 PHONY += help
1568 help: 1537 help:
1569 @echo 'Cleaning targets:' 1538 @echo 'Cleaning targets:'
1570 @echo ' clean - Remove mo 1539 @echo ' clean - Remove most generated files but keep the config and'
1571 @echo ' enough bu 1540 @echo ' enough build support to build external modules'
1572 @echo ' mrproper - Remove al 1541 @echo ' mrproper - Remove all generated files + config + various backup files'
1573 @echo ' distclean - mrproper 1542 @echo ' distclean - mrproper + remove editor backup and patch files'
1574 @echo '' 1543 @echo ''
>> 1544 @echo 'Configuration targets:'
1575 @$(MAKE) -f $(srctree)/scripts/kconfi 1545 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1576 @echo '' 1546 @echo ''
1577 @echo 'Other generic targets:' 1547 @echo 'Other generic targets:'
1578 @echo ' all - Build all 1548 @echo ' all - Build all targets marked with [*]'
1579 @echo '* vmlinux - Build the 1549 @echo '* vmlinux - Build the bare kernel'
1580 @echo '* modules - Build all 1550 @echo '* modules - Build all modules'
1581 @echo ' modules_install - Install a 1551 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1582 @echo ' vdso_install - Install u <<
1583 @echo ' dir/ - Build all 1552 @echo ' dir/ - Build all files in dir and below'
1584 @echo ' dir/file.[ois] - Build spe 1553 @echo ' dir/file.[ois] - Build specified target only'
1585 @echo ' dir/file.ll - Build the 1554 @echo ' dir/file.ll - Build the LLVM assembly file'
1586 @echo ' (requires 1555 @echo ' (requires compiler support for LLVM assembly generation)'
1587 @echo ' dir/file.lst - Build spe 1556 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1588 @echo ' (requires 1557 @echo ' (requires a recent binutils and recent build (System.map))'
1589 @echo ' dir/file.ko - Build mod 1558 @echo ' dir/file.ko - Build module including final link'
1590 @echo ' modules_prepare - Set up fo 1559 @echo ' modules_prepare - Set up for building external modules'
1591 @echo ' tags/TAGS - Generate 1560 @echo ' tags/TAGS - Generate tags file for editors'
1592 @echo ' cscope - Generate 1561 @echo ' cscope - Generate cscope index'
1593 @echo ' gtags - Generate 1562 @echo ' gtags - Generate GNU GLOBAL index'
1594 @echo ' kernelrelease - Output th 1563 @echo ' kernelrelease - Output the release version string (use with make -s)'
1595 @echo ' kernelversion - Output th 1564 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1596 @echo ' image_name - Output th 1565 @echo ' image_name - Output the image name (use with make -s)'
1597 @echo ' headers_install - Install s 1566 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1598 echo ' (default: 1567 echo ' (default: $(INSTALL_HDR_PATH))'; \
1599 echo '' 1568 echo ''
1600 @echo 'Static analysers:' 1569 @echo 'Static analysers:'
1601 @echo ' checkstack - Generate !! 1570 @echo ' checkstack - Generate a list of stack hogs'
1602 @echo ' with a st !! 1571 @echo ' namespacecheck - Name space analysis on compiled kernel'
1603 @echo ' versioncheck - Sanity ch 1572 @echo ' versioncheck - Sanity check on version.h usage'
1604 @echo ' includecheck - Check for 1573 @echo ' includecheck - Check for duplicate included header files'
1605 @echo ' export_report - List the 1574 @echo ' export_report - List the usages of all exported symbols'
1606 @echo ' headerdep - Detect in 1575 @echo ' headerdep - Detect inclusion cycles in headers'
1607 @echo ' coccicheck - Check wit 1576 @echo ' coccicheck - Check with Coccinelle'
1608 @echo ' clang-analyzer - Check wit <<
1609 @echo ' clang-tidy - Check wit <<
1610 @echo '' 1577 @echo ''
1611 @echo 'Tools:' 1578 @echo 'Tools:'
1612 @echo ' nsdeps - Generate 1579 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1613 @echo '' 1580 @echo ''
1614 @echo 'Kernel selftest:' 1581 @echo 'Kernel selftest:'
1615 @echo ' kselftest - Build a 1582 @echo ' kselftest - Build and run kernel selftest'
1616 @echo ' Build, 1583 @echo ' Build, install, and boot kernel before'
1617 @echo ' running 1584 @echo ' running kselftest on it'
1618 @echo ' Run as 1585 @echo ' Run as root for full coverage'
1619 @echo ' kselftest-all - Build k 1586 @echo ' kselftest-all - Build kernel selftest'
1620 @echo ' kselftest-install - Build a 1587 @echo ' kselftest-install - Build and install kernel selftest'
1621 @echo ' kselftest-clean - Remove 1588 @echo ' kselftest-clean - Remove all generated kselftest files'
1622 @echo ' kselftest-merge - Merge a 1589 @echo ' kselftest-merge - Merge all the config dependencies of'
1623 @echo ' kselfte 1590 @echo ' kselftest to existing .config.'
1624 @echo '' 1591 @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 $(dtstree), \ 1592 @$(if $(dtstree), \
1644 echo 'Devicetree:'; \ 1593 echo 'Devicetree:'; \
1645 echo '* dtbs - !! 1594 echo '* dtbs - Build device tree blobs for enabled boards'; \
1646 echo ' dtbs_install - !! 1595 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1647 echo ' dt_binding_check - !! 1596 echo ' dt_binding_check - Validate device tree binding documents'; \
1648 echo ' dt_binding_schemas - !! 1597 echo ' dtbs_check - Validate device tree source files';\
1649 echo ' dtbs_check - <<
1650 echo '') 1598 echo '')
1651 1599
1652 @echo 'Userspace tools targets:' 1600 @echo 'Userspace tools targets:'
1653 @echo ' use "make tools/help"' 1601 @echo ' use "make tools/help"'
1654 @echo ' or "cd tools; make help"' 1602 @echo ' or "cd tools; make help"'
1655 @echo '' 1603 @echo ''
1656 @echo 'Kernel packaging:' 1604 @echo 'Kernel packaging:'
1657 @$(MAKE) -f $(srctree)/scripts/Makefi 1605 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1658 @echo '' 1606 @echo ''
1659 @echo 'Documentation targets:' 1607 @echo 'Documentation targets:'
1660 @$(MAKE) -f $(srctree)/Documentation/ 1608 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1661 @echo '' 1609 @echo ''
1662 @echo 'Architecture-specific targets !! 1610 @echo 'Architecture specific targets ($(SRCARCH)):'
1663 @$(or $(archhelp),\ !! 1611 @$(if $(archhelp),$(archhelp),\
1664 echo ' No architecture-speci !! 1612 echo ' No architecture specific help defined for $(SRCARCH)')
1665 @echo '' 1613 @echo ''
1666 @$(if $(boards), \ 1614 @$(if $(boards), \
1667 $(foreach b, $(boards), \ 1615 $(foreach b, $(boards), \
1668 printf " %-27s - Build for % 1616 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1669 echo '') 1617 echo '')
1670 @$(if $(board-dirs), \ 1618 @$(if $(board-dirs), \
1671 $(foreach b, $(board-dirs), \ 1619 $(foreach b, $(board-dirs), \
1672 printf " %-16s - Show %s-spe 1620 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1673 printf " %-16s - Show all of 1621 printf " %-16s - Show all of the above\\n" help-boards; \
1674 echo '') 1622 echo '')
1675 1623
1676 @echo ' make V=n [targets] 1: ver !! 1624 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1677 @echo ' 2: giv !! 1625 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1678 @echo ' V=1 an <<
1679 @echo ' make O=dir [targets] Locate 1626 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1680 @echo ' make C=1 [targets] Check 1627 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1681 @echo ' (spars 1628 @echo ' (sparse by default)'
1682 @echo ' make C=2 [targets] Force 1629 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1683 @echo ' make RECORDMCOUNT_WARN=1 [t 1630 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1684 @echo ' make W=n [targets] Enable !! 1631 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1685 @echo ' 1: warnings w 1632 @echo ' 1: warnings which may be relevant and do not occur too often'
1686 @echo ' 2: warnings w 1633 @echo ' 2: warnings which occur quite often but may still be relevant'
1687 @echo ' 3: more obscu 1634 @echo ' 3: more obscure warnings, can most likely be ignored'
1688 @echo ' c: extra chec <<
1689 @echo ' e: warnings a <<
1690 @echo ' Multiple leve 1635 @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 '' 1636 @echo ''
1696 @echo 'Execute "make" or "make all" 1637 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1697 @echo 'For further info see the ./RE 1638 @echo 'For further info see the ./README file'
1698 1639
1699 1640
1700 help-board-dirs := $(addprefix help-,$(board- 1641 help-board-dirs := $(addprefix help-,$(board-dirs))
1701 1642
1702 help-boards: $(help-board-dirs) 1643 help-boards: $(help-board-dirs)
1703 1644
1704 boards-per-dir = $(sort $(notdir $(wildcard $ 1645 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1705 1646
1706 $(help-board-dirs): help-%: 1647 $(help-board-dirs): help-%:
1707 @echo 'Architecture-specific targets !! 1648 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1708 @$(if $(boards-per-dir), \ 1649 @$(if $(boards-per-dir), \
1709 $(foreach b, $(boards-per-dir 1650 $(foreach b, $(boards-per-dir), \
1710 printf " %-24s - Build for % 1651 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1711 echo '') 1652 echo '')
1712 1653
1713 1654
1714 # Documentation targets 1655 # Documentation targets
1715 # ------------------------------------------- 1656 # ---------------------------------------------------------------------------
1716 DOC_TARGETS := xmldocs latexdocs pdfdocs html 1657 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1717 linkcheckdocs dochelp refcheck !! 1658 linkcheckdocs dochelp refcheckdocs
1718 PHONY += $(DOC_TARGETS) 1659 PHONY += $(DOC_TARGETS)
1719 $(DOC_TARGETS): 1660 $(DOC_TARGETS):
1720 $(Q)$(MAKE) $(build)=Documentation $@ 1661 $(Q)$(MAKE) $(build)=Documentation $@
1721 1662
1722 <<
1723 # Rust targets <<
1724 # ------------------------------------------- <<
1725 <<
1726 # "Is Rust available?" target <<
1727 PHONY += rustavailable <<
1728 rustavailable: <<
1729 +$(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 1663 # Misc
1764 # ------------------------------------------- 1664 # ---------------------------------------------------------------------------
1765 1665
1766 PHONY += misc-check <<
1767 misc-check: <<
1768 $(Q)$(srctree)/scripts/misc-check <<
1769 <<
1770 all: misc-check <<
1771 <<
1772 PHONY += scripts_gdb 1666 PHONY += scripts_gdb
1773 scripts_gdb: prepare0 1667 scripts_gdb: prepare0
1774 $(Q)$(MAKE) $(build)=scripts/gdb 1668 $(Q)$(MAKE) $(build)=scripts/gdb
1775 $(Q)ln -fsn $(abspath $(srctree)/scri 1669 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1776 1670
1777 ifdef CONFIG_GDB_SCRIPTS 1671 ifdef CONFIG_GDB_SCRIPTS
1778 all: scripts_gdb 1672 all: scripts_gdb
1779 endif 1673 endif
1780 1674
1781 else # KBUILD_EXTMOD 1675 else # KBUILD_EXTMOD
1782 1676
1783 filechk_kernel.release = echo $(KERNELRELEASE <<
1784 <<
1785 ### 1677 ###
1786 # External module support. 1678 # External module support.
1787 # When building external modules the kernel u 1679 # When building external modules the kernel used as basis is considered
1788 # read-only, and no consistency checks are ma 1680 # read-only, and no consistency checks are made and the make
1789 # system is not used on the basis kernel. If 1681 # system is not used on the basis kernel. If updates are required
1790 # in the basis kernel ordinary make commands !! 1682 # in the basis kernel ordinary make commands (without M=...) must
>> 1683 # be used.
>> 1684 #
>> 1685 # The following are the only valid targets when building external
>> 1686 # modules.
>> 1687 # make M=dir clean Delete all automatically generated files
>> 1688 # make M=dir modules Make all modules in specified dir
>> 1689 # make M=dir Same as 'make M=dir modules'
>> 1690 # make M=dir modules_install
>> 1691 # Install the modules built in the module directory
>> 1692 # Assumes install directory is already created
1791 1693
1792 # We are always building only modules. !! 1694 # We are always building modules
1793 KBUILD_BUILTIN := <<
1794 KBUILD_MODULES := 1 1695 KBUILD_MODULES := 1
1795 1696
1796 build-dir := $(KBUILD_EXTMOD) !! 1697 build-dirs := $(KBUILD_EXTMOD)
>> 1698 PHONY += modules
>> 1699 modules: descend
>> 1700 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1797 1701
1798 compile_commands.json: $(extmod_prefix)compil !! 1702 PHONY += modules_install
1799 PHONY += compile_commands.json !! 1703 modules_install: _emodinst_ _emodinst_post
1800 1704
1801 clean-dirs := $(KBUILD_EXTMOD) !! 1705 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1802 clean: private rm-files := $(KBUILD_EXTMOD)/M !! 1706 PHONY += _emodinst_
1803 $(KBUILD_EXTMOD)/compile_commands.jso !! 1707 _emodinst_:
>> 1708 $(Q)mkdir -p $(MODLIB)/$(install-dir)
>> 1709 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
>> 1710
>> 1711 PHONY += _emodinst_post
>> 1712 _emodinst_post: _emodinst_
>> 1713 $(call cmd,depmod)
1804 1714
1805 PHONY += prepare !! 1715 clean-dirs := $(KBUILD_EXTMOD)
1806 # now expand this into a simple variable to r !! 1716 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps
1807 prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT <<
1808 prepare: <<
1809 @if [ "$(CC_VERSION_TEXT)" != "$(CONF <<
1810 echo >&2 "warning: the compil <<
1811 echo >&2 " The kernel was bu <<
1812 echo >&2 " You are using: <<
1813 fi <<
1814 1717
1815 PHONY += help 1718 PHONY += help
1816 help: 1719 help:
1817 @echo ' Building external modules.' 1720 @echo ' Building external modules.'
1818 @echo ' Syntax: make -C path/to/ker 1721 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1819 @echo '' 1722 @echo ''
1820 @echo ' modules - default t 1723 @echo ' modules - default target, build the module(s)'
1821 @echo ' modules_install - install t 1724 @echo ' modules_install - install the module'
1822 @echo ' clean - remove ge 1725 @echo ' clean - remove generated files in module directory only'
1823 @echo ' rust-analyzer - generate <<
1824 @echo '' 1726 @echo ''
1825 1727
1826 ifndef CONFIG_MODULES !! 1728 PHONY += prepare
1827 modules modules_install: __external_modules_e <<
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 <<
1836 endif # KBUILD_EXTMOD 1729 endif # KBUILD_EXTMOD
1837 1730
1838 # ------------------------------------------- <<
1839 # Modules <<
1840 <<
1841 PHONY += modules modules_install modules_sign <<
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 <<
1860 ifdef CONFIG_MODULES <<
1861 <<
1862 $(MODORDER): $(build-dir) <<
1863 @: <<
1864 <<
1865 # KBUILD_MODPOST_NOFINAL can be set to skip t <<
1866 # This is solely useful to speed up test comp <<
1867 modules: modpost <<
1868 ifneq ($(KBUILD_MODPOST_NOFINAL),1) <<
1869 $(Q)$(MAKE) -f $(srctree)/scripts/Mak <<
1870 endif <<
1871 <<
1872 PHONY += modules_check <<
1873 modules_check: $(MODORDER) <<
1874 $(Q)$(CONFIG_SHELL) $(srctree)/script <<
1875 <<
1876 else # CONFIG_MODULES <<
1877 <<
1878 modules: <<
1879 @: <<
1880 <<
1881 KBUILD_MODULES := <<
1882 <<
1883 endif # CONFIG_MODULES <<
1884 <<
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 1731 # Single targets
1891 # ------------------------------------------- 1732 # ---------------------------------------------------------------------------
1892 # To build individual files in subdirectories 1733 # To build individual files in subdirectories, you can do like this:
1893 # 1734 #
1894 # make foo/bar/baz.s 1735 # make foo/bar/baz.s
1895 # 1736 #
1896 # The supported suffixes for single-target ar 1737 # The supported suffixes for single-target are listed in 'single-targets'
1897 # 1738 #
1898 # To build only under specific subdirectories 1739 # To build only under specific subdirectories, you can do like this:
1899 # 1740 #
1900 # make foo/bar/baz/ 1741 # make foo/bar/baz/
1901 1742
1902 ifdef single-build 1743 ifdef single-build
1903 1744
1904 # .ko is special because modpost is needed 1745 # .ko is special because modpost is needed
1905 single-ko := $(sort $(filter %.ko, $(MAKECMDG 1746 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1906 single-no-ko := $(filter-out $(single-ko), $( !! 1747 single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1907 $(foreach x, o mod, $(patsubs <<
1908 1748
1909 $(single-ko): single_modules !! 1749 $(single-ko): single_modpost
1910 @: 1750 @:
1911 $(single-no-ko): $(build-dir) !! 1751 $(single-no-ko): descend
1912 @: 1752 @:
1913 1753
1914 # Remove MODORDER when done because it is not !! 1754 ifeq ($(KBUILD_EXTMOD),)
1915 PHONY += single_modules !! 1755 # For the single build of in-tree modules, use a temporary file to avoid
1916 single_modules: $(single-no-ko) modules_prepa !! 1756 # the situation of modules_install installing an invalid modules.order.
1917 $(Q){ $(foreach m, $(single-ko), echo !! 1757 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 1758 endif
1922 $(Q)rm -f $(MODORDER) <<
1923 1759
1924 single-goals := $(addprefix $(build-dir)/, $( !! 1760 PHONY += single_modpost
>> 1761 single_modpost: $(single-no-ko)
>> 1762 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
>> 1763 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1925 1764
1926 KBUILD_MODULES := 1 1765 KBUILD_MODULES := 1
1927 1766
>> 1767 export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
>> 1768
>> 1769 # trim unrelated directories
>> 1770 build-dirs := $(foreach d, $(build-dirs), \
>> 1771 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
>> 1772
>> 1773 endif
>> 1774
>> 1775 ifndef CONFIG_MODULES
>> 1776 KBUILD_MODULES :=
1928 endif 1777 endif
1929 1778
>> 1779 # Handle descending into subdirectories listed in $(build-dirs)
1930 # Preset locale variables to speed up the bui 1780 # Preset locale variables to speed up the build process. Limit locale
1931 # tweaks to this spot to avoid wrong language 1781 # tweaks to this spot to avoid wrong language settings when running
1932 # make menuconfig etc. 1782 # make menuconfig etc.
1933 # Error messages still appears in the origina 1783 # Error messages still appears in the original language
1934 PHONY += $(build-dir) !! 1784 PHONY += descend $(build-dirs)
1935 $(build-dir): prepare !! 1785 descend: $(build-dirs)
1936 $(Q)$(MAKE) $(build)=$@ need-builtin= !! 1786 $(build-dirs): prepare
>> 1787 $(Q)$(MAKE) $(build)=$@ \
>> 1788 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \
>> 1789 need-builtin=1 need-modorder=1
1937 1790
1938 clean-dirs := $(addprefix _clean_, $(clean-di 1791 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1939 PHONY += $(clean-dirs) clean 1792 PHONY += $(clean-dirs) clean
1940 $(clean-dirs): 1793 $(clean-dirs):
1941 $(Q)$(MAKE) $(clean)=$(patsubst _clea 1794 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1942 1795
1943 clean: $(clean-dirs) 1796 clean: $(clean-dirs)
1944 $(call cmd,rmfiles) 1797 $(call cmd,rmfiles)
1945 @find $(or $(KBUILD_EXTMOD), .) $(RCS !! 1798 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1946 \( -name '*.[aios]' -o -name !! 1799 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1947 -o -name '*.ko.*' \ 1800 -o -name '*.ko.*' \
1948 -o -name '*.dtb' -o -name '*. !! 1801 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1949 -o -name '*.dtb.S' -o -name ' <<
1950 -o -name '*.dt.yaml' -o -name <<
1951 -o -name '*.dwo' -o -name '*. 1802 -o -name '*.dwo' -o -name '*.lst' \
1952 -o -name '*.su' -o -name '*.m 1803 -o -name '*.su' -o -name '*.mod' \
1953 -o -name '.*.d' -o -name '.*. 1804 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1954 -o -name '*.lex.c' -o -name ' 1805 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1955 -o -name '*.asn1.[ch]' \ 1806 -o -name '*.asn1.[ch]' \
1956 -o -name '*.symtypes' -o -nam 1807 -o -name '*.symtypes' -o -name 'modules.order' \
>> 1808 -o -name '.tmp_*.o.*' \
1957 -o -name '*.c.[012]*.*' \ 1809 -o -name '*.c.[012]*.*' \
1958 -o -name '*.ll' \ 1810 -o -name '*.ll' \
1959 -o -name '*.gcno' \ !! 1811 -o -name '*.gcno' \) -type f -print | xargs rm -f
1960 \) -type f -print \ <<
1961 -o -name '.tmp_*' -print \ <<
1962 | xargs rm -rf <<
1963 1812
1964 # Generate tags for editors 1813 # Generate tags for editors
1965 # ------------------------------------------- 1814 # ---------------------------------------------------------------------------
1966 quiet_cmd_tags = GEN $@ 1815 quiet_cmd_tags = GEN $@
1967 cmd_tags = $(BASH) $(srctree)/scripts/t 1816 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1968 1817
1969 tags TAGS cscope gtags: FORCE 1818 tags TAGS cscope gtags: FORCE
1970 $(call cmd,tags) 1819 $(call cmd,tags)
1971 1820
1972 # Generate rust-project.json (a file that des <<
1973 # Rust projects) for rust-analyzer (an implem <<
1974 # Protocol). <<
1975 PHONY += rust-analyzer <<
1976 rust-analyzer: <<
1977 +$(Q)$(CONFIG_SHELL) $(srctree)/scrip <<
1978 $(Q)$(MAKE) $(build)=rust $@ <<
1979 <<
1980 # Script to generate missing namespace depend 1821 # Script to generate missing namespace dependencies
1981 # ------------------------------------------- 1822 # ---------------------------------------------------------------------------
1982 1823
1983 PHONY += nsdeps 1824 PHONY += nsdeps
1984 nsdeps: export KBUILD_NSDEPS=1 1825 nsdeps: export KBUILD_NSDEPS=1
1985 nsdeps: modules 1826 nsdeps: modules
1986 $(Q)$(CONFIG_SHELL) $(srctree)/script 1827 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1987 1828
1988 # Clang Tooling <<
1989 # ------------------------------------------- <<
1990 <<
1991 quiet_cmd_gen_compile_commands = GEN $@ <<
1992 cmd_gen_compile_commands = $(PYTHON3) $ <<
1993 <<
1994 $(extmod_prefix)compile_commands.json: $(srct <<
1995 $(if $(KBUILD_EXTMOD),, vmlinux.a $(K <<
1996 $(if $(CONFIG_MODULES), $(MODORDER)) <<
1997 $(call if_changed,gen_compile_command <<
1998 <<
1999 targets += $(extmod_prefix)compile_commands.j <<
2000 <<
2001 PHONY += clang-tidy clang-analyzer <<
2002 <<
2003 ifdef CONFIG_CC_IS_CLANG <<
2004 quiet_cmd_clang_tools = CHECK $< <<
2005 cmd_clang_tools = $(PYTHON3) $(srctree) <<
2006 <<
2007 clang-tidy clang-analyzer: $(extmod_prefix)co <<
2008 $(call cmd,clang_tools) <<
2009 else <<
2010 clang-tidy clang-analyzer: <<
2011 @echo "$@ requires CC=clang" >&2 <<
2012 @false <<
2013 endif <<
2014 <<
2015 # Scripts to check various things for consist 1829 # Scripts to check various things for consistency
2016 # ------------------------------------------- 1830 # ---------------------------------------------------------------------------
2017 1831
2018 PHONY += includecheck versioncheck coccicheck !! 1832 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
2019 1833
2020 includecheck: 1834 includecheck:
2021 find $(srctree)/* $(RCS_FIND_IGNORE) 1835 find $(srctree)/* $(RCS_FIND_IGNORE) \
2022 -name '*.[hcS]' -type f -prin 1836 -name '*.[hcS]' -type f -print | sort \
2023 | xargs $(PERL) -w $(srctree) 1837 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
2024 1838
2025 versioncheck: 1839 versioncheck:
2026 find $(srctree)/* $(RCS_FIND_IGNORE) 1840 find $(srctree)/* $(RCS_FIND_IGNORE) \
2027 -name '*.[hcS]' -type f -prin 1841 -name '*.[hcS]' -type f -print | sort \
2028 | xargs $(PERL) -w $(srctree) 1842 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
2029 1843
2030 coccicheck: 1844 coccicheck:
2031 $(Q)$(BASH) $(srctree)/scripts/$@ 1845 $(Q)$(BASH) $(srctree)/scripts/$@
2032 1846
>> 1847 namespacecheck:
>> 1848 $(PERL) $(srctree)/scripts/namespace.pl
>> 1849
2033 export_report: 1850 export_report:
2034 $(PERL) $(srctree)/scripts/export_rep 1851 $(PERL) $(srctree)/scripts/export_report.pl
2035 1852
2036 PHONY += checkstack kernelrelease kernelversi 1853 PHONY += checkstack kernelrelease kernelversion image_name
2037 1854
2038 # UML needs a little special treatment here. 1855 # UML needs a little special treatment here. It wants to use the host
2039 # toolchain, so needs $(SUBARCH) passed to ch 1856 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
2040 # else wants $(ARCH), including people doing 1857 # else wants $(ARCH), including people doing cross-builds, which means
2041 # that $(SUBARCH) doesn't work here. 1858 # that $(SUBARCH) doesn't work here.
2042 ifeq ($(ARCH), um) 1859 ifeq ($(ARCH), um)
2043 CHECKSTACK_ARCH := $(SUBARCH) 1860 CHECKSTACK_ARCH := $(SUBARCH)
2044 else 1861 else
2045 CHECKSTACK_ARCH := $(ARCH) 1862 CHECKSTACK_ARCH := $(ARCH)
2046 endif 1863 endif
2047 MINSTACKSIZE ?= 100 <<
2048 checkstack: 1864 checkstack:
2049 $(OBJDUMP) -d vmlinux $$(find . -name 1865 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
2050 $(PERL) $(srctree)/scripts/checkstack !! 1866 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
2051 1867
2052 kernelrelease: 1868 kernelrelease:
2053 @$(filechk_kernel.release) !! 1869 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
2054 1870
2055 kernelversion: 1871 kernelversion:
2056 @echo $(KERNELVERSION) 1872 @echo $(KERNELVERSION)
2057 1873
2058 image_name: 1874 image_name:
2059 @echo $(KBUILD_IMAGE) 1875 @echo $(KBUILD_IMAGE)
2060 1876
2061 PHONY += run-command !! 1877 # Clear a bunch of variables before executing the submake
2062 run-command: !! 1878
2063 $(Q)$(KBUILD_RUN_COMMAND) !! 1879 ifeq ($(quiet),silent_)
>> 1880 tools_silent=s
>> 1881 endif
>> 1882
>> 1883 tools/: FORCE
>> 1884 $(Q)mkdir -p $(objtree)/tools
>> 1885 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
>> 1886
>> 1887 tools/%: FORCE
>> 1888 $(Q)mkdir -p $(objtree)/tools
>> 1889 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
2064 1890
2065 quiet_cmd_rmfiles = $(if $(wildcard $(rm-file 1891 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
2066 cmd_rmfiles = rm -rf $(rm-files) 1892 cmd_rmfiles = rm -rf $(rm-files)
>> 1893
>> 1894 # Run depmod only if we have System.map and depmod is executable
>> 1895 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
>> 1896 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
>> 1897 $(KERNELRELEASE)
2067 1898
2068 # read saved command lines for existing targe 1899 # read saved command lines for existing targets
2069 existing-targets := $(wildcard $(sort $(targe 1900 existing-targets := $(wildcard $(sort $(targets)))
2070 1901
2071 -include $(foreach f,$(existing-targets),$(di 1902 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
2072 1903
2073 endif # config-build 1904 endif # config-build
2074 endif # mixed-build 1905 endif # mixed-build
2075 endif # need-sub-make 1906 endif # need-sub-make
2076 1907
2077 PHONY += FORCE 1908 PHONY += FORCE
2078 FORCE: 1909 FORCE:
2079 1910
2080 # Declare the contents of the PHONY variable 1911 # Declare the contents of the PHONY variable as phony. We keep that
2081 # information in a variable so we can use it 1912 # information in a variable so we can use it in if_changed and friends.
2082 .PHONY: $(PHONY) 1913 .PHONY: $(PHONY)
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