1 # SPDX-License-Identifier: GPL-2.0 1 # SPDX-License-Identifier: GPL-2.0
2 VERSION = 6 !! 2 VERSION = 4
3 PATCHLEVEL = 12 !! 3 PATCHLEVEL = 20
4 SUBLEVEL = 0 !! 4 SUBLEVEL = 17
5 EXTRAVERSION = -rc7 !! 5 EXTRAVERSION =
6 NAME = Baby Opossum Posse !! 6 NAME = Shy Crocodile
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)),) !! 14 # That's our default target when none is given on the command line
15 $(error GNU Make >= 4.0 is required. Your Make !! 15 PHONY := _all
16 endif !! 16 _all:
17 17
18 $(if $(filter __%, $(MAKECMDGOALS)), \ !! 18 # Do not use make's built-in rules and variables
19 $(error targets prefixed with '__' are !! 19 # (this increases performance and avoids hard-to-debug behaviour)
>> 20 MAKEFLAGS += -rR
20 21
21 # That's our default target when none is given !! 22 # Avoid funny character set dependencies
22 PHONY := __all !! 23 unexport LC_ALL
23 __all: !! 24 LC_COLLATE=C
>> 25 LC_NUMERIC=C
>> 26 export LC_COLLATE LC_NUMERIC
>> 27
>> 28 # Avoid interference with shell env settings
>> 29 unexport GREP_OPTIONS
24 30
25 # We are using a recursive build, so we need t 31 # We are using a recursive build, so we need to do a little thinking
26 # to get the ordering right. 32 # to get the ordering right.
27 # 33 #
28 # Most importantly: sub-Makefiles should only 34 # Most importantly: sub-Makefiles should only ever modify files in
29 # their own directory. If in some directory we 35 # their own directory. If in some directory we have a dependency on
30 # a file in another dir (which doesn't happen 36 # a file in another dir (which doesn't happen often, but it's often
31 # unavoidable when linking the built-in.a targ 37 # unavoidable when linking the built-in.a targets which finally
32 # turn into vmlinux), we will call a sub make 38 # turn into vmlinux), we will call a sub make in that other dir, and
33 # after that we are sure that everything which 39 # after that we are sure that everything which is in that other dir
34 # is now up to date. 40 # is now up to date.
35 # 41 #
36 # The only cases where we need to modify files 42 # The only cases where we need to modify files which have global
37 # effects are thus separated out and done befo 43 # effects are thus separated out and done before the recursive
38 # descending is started. They are now explicit 44 # descending is started. They are now explicitly listed as the
39 # prepare rule. 45 # prepare rule.
40 46
41 this-makefile := $(lastword $(MAKEFILE_LIST)) <<
42 abs_srctree := $(realpath $(dir $(this-makefil <<
43 abs_objtree := $(CURDIR) <<
44 <<
45 ifneq ($(sub_make_done),1) <<
46 <<
47 # Do not use make's built-in rules and variabl <<
48 # (this increases performance and avoids hard- <<
49 MAKEFLAGS += -rR <<
50 <<
51 # Avoid funny character set dependencies <<
52 unexport LC_ALL <<
53 LC_COLLATE=C <<
54 LC_NUMERIC=C <<
55 export LC_COLLATE LC_NUMERIC <<
56 <<
57 # Avoid interference with shell env settings <<
58 unexport GREP_OPTIONS <<
59 <<
60 # Beautify output 47 # Beautify output
61 # -------------------------------------------- 48 # ---------------------------------------------------------------------------
62 # 49 #
63 # Most of build commands in Kbuild start with !! 50 # Normally, we echo the whole command before executing it. By making
64 # "quiet_cmd_*". If defined, the short log is !! 51 # that echo $($(quiet)$(cmd)), we now have the possibility to set
65 # that command is printed by default. !! 52 # $(quiet) to choose other forms of output instead, e.g.
66 # !! 53 #
67 # e.g.) !! 54 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
68 # quiet_cmd_depmod = DEPMOD $(MODLIB) !! 55 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
69 # cmd_depmod = $(srctree)/scripts/dep !! 56 #
>> 57 # If $(quiet) is empty, the whole command will be printed.
>> 58 # If it is set to "quiet_", only the short version will be printed.
>> 59 # If it is set to "silent_", nothing will be printed at all, since
>> 60 # the variable $(silent_cmd_cc_o_c) doesn't exist.
70 # 61 #
71 # A simple variant is to prefix commands with 62 # A simple variant is to prefix commands with $(Q) - that's useful
72 # for commands that shall be hidden in non-ver 63 # for commands that shall be hidden in non-verbose mode.
73 # 64 #
74 # $(Q)$(MAKE) $(build)=scripts/basic !! 65 # $(Q)ln $@ :<
75 # 66 #
76 # If KBUILD_VERBOSE contains 1, the whole comm !! 67 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
77 # If KBUILD_VERBOSE contains 2, the reason for !! 68 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
78 # 69 #
79 # To put more focus on warnings, be less verbo 70 # To put more focus on warnings, be less verbose as default
80 # Use 'make V=1' to see the full commands 71 # Use 'make V=1' to see the full commands
81 72
82 ifeq ("$(origin V)", "command line") 73 ifeq ("$(origin V)", "command line")
83 KBUILD_VERBOSE = $(V) 74 KBUILD_VERBOSE = $(V)
84 endif 75 endif
>> 76 ifndef KBUILD_VERBOSE
>> 77 KBUILD_VERBOSE = 0
>> 78 endif
85 79
86 quiet = quiet_ !! 80 ifeq ($(KBUILD_VERBOSE),1)
87 Q = @ <<
88 <<
89 ifneq ($(findstring 1, $(KBUILD_VERBOSE)),) <<
90 quiet = 81 quiet =
91 Q = 82 Q =
>> 83 else
>> 84 quiet=quiet_
>> 85 Q = @
92 endif 86 endif
93 87
94 # If the user is running make -s (silent mode) 88 # If the user is running make -s (silent mode), suppress echoing of
95 # commands 89 # commands
96 ifneq ($(findstring s,$(firstword -$(MAKEFLAGS !! 90
97 quiet=silent_ !! 91 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
98 override KBUILD_VERBOSE := !! 92 quiet=silent_
>> 93 tools_silent=s
99 endif 94 endif
100 95
101 export quiet Q KBUILD_VERBOSE 96 export quiet Q KBUILD_VERBOSE
102 97
103 # Call a source code checker (by default, "spa !! 98 # kbuild supports saving output files in a separate directory.
104 # C compilation. !! 99 # To locate output files in a separate directory two syntaxes are supported.
>> 100 # In both cases the working directory must be the root of the kernel src.
>> 101 # 1) O=
>> 102 # Use "make O=dir/to/store/output/files/"
105 # 103 #
106 # Use 'make C=1' to enable checking of only re !! 104 # 2) Set KBUILD_OUTPUT
107 # Use 'make C=2' to enable checking of *all* s !! 105 # Set the environment variable KBUILD_OUTPUT to point to the directory
108 # of whether they are re-compiled or not. !! 106 # where the output files shall be placed.
>> 107 # export KBUILD_OUTPUT=dir/to/store/output/files/
>> 108 # make
109 # 109 #
110 # See the file "Documentation/dev-tools/sparse !! 110 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
111 # including where to get the "sparse" utility. !! 111 # variable.
112 <<
113 ifeq ("$(origin C)", "command line") <<
114 KBUILD_CHECKSRC = $(C) <<
115 endif <<
116 ifndef KBUILD_CHECKSRC <<
117 KBUILD_CHECKSRC = 0 <<
118 endif <<
119 112
120 export KBUILD_CHECKSRC !! 113 # KBUILD_SRC is not intended to be used by the regular user (for now),
>> 114 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
>> 115 ifeq ($(KBUILD_SRC),)
121 116
122 # Enable "clippy" (a linter) as part of the Ru !! 117 # OK, Make called in directory where kernel src resides
123 # !! 118 # Do we want to locate output files in a separate directory?
124 # Use 'make CLIPPY=1' to enable it. !! 119 ifeq ("$(origin O)", "command line")
125 ifeq ("$(origin CLIPPY)", "command line") !! 120 KBUILD_OUTPUT := $(O)
126 KBUILD_CLIPPY := $(CLIPPY) <<
127 endif 121 endif
128 122
129 export KBUILD_CLIPPY !! 123 # Cancel implicit rules on top Makefile
>> 124 $(CURDIR)/Makefile Makefile: ;
130 125
131 # Use make M=dir or set the environment variab !! 126 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
132 # directory of external module to build. Setti !! 127 $(error main directory cannot contain spaces nor colons)
133 ifeq ("$(origin M)", "command line") <<
134 KBUILD_EXTMOD := $(M) <<
135 endif 128 endif
136 129
137 $(if $(word 2, $(KBUILD_EXTMOD)), \ !! 130 ifneq ($(KBUILD_OUTPUT),)
138 $(error building multiple external mod !! 131 # check that the output directory actually exists
>> 132 saved-output := $(KBUILD_OUTPUT)
>> 133 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
>> 134 && pwd)
>> 135 $(if $(KBUILD_OUTPUT),, \
>> 136 $(error failed to create output directory "$(saved-output)"))
>> 137
>> 138 # Look for make include files relative to root of kernel src
>> 139 #
>> 140 # This does not become effective immediately because MAKEFLAGS is re-parsed
>> 141 # once after the Makefile is read. It is OK since we are going to invoke
>> 142 # 'sub-make' below.
>> 143 MAKEFLAGS += --include-dir=$(CURDIR)
139 144
140 $(foreach x, % :, $(if $(findstring $x, $(KBUI !! 145 PHONY += $(MAKECMDGOALS) sub-make
141 $(error module directory path cannot c <<
142 146
143 # Remove trailing slashes !! 147 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
144 ifneq ($(filter %/, $(KBUILD_EXTMOD)),) !! 148 @:
145 KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTM <<
146 endif <<
147 149
148 export KBUILD_EXTMOD !! 150 # Invoke a second make in the output directory, passing relevant variables
>> 151 sub-make:
>> 152 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
>> 153 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
149 154
150 # backward compatibility !! 155 # Leave processing to above invocation of make
151 KBUILD_EXTRA_WARN ?= $(KBUILD_ENABLE_EXTRA_GCC !! 156 skip-makefile := 1
>> 157 endif # ifneq ($(KBUILD_OUTPUT),)
>> 158 endif # ifeq ($(KBUILD_SRC),)
152 159
153 ifeq ("$(origin W)", "command line") !! 160 # We process the rest of the Makefile if this is the final invocation of make
154 KBUILD_EXTRA_WARN := $(W) !! 161 ifeq ($(skip-makefile),)
155 endif <<
156 162
157 export KBUILD_EXTRA_WARN !! 163 # Do not print "Entering directory ...",
>> 164 # but we want to display it when entering to the output directory
>> 165 # so that IDEs/editors are able to understand relative filenames.
>> 166 MAKEFLAGS += --no-print-directory
158 167
159 # Kbuild will save output files in the current !! 168 # Call a source code checker (by default, "sparse") as part of the
160 # This does not need to match to the root of t !! 169 # C compilation.
161 # <<
162 # For example, you can do this: <<
163 # <<
164 # cd /dir/to/store/output/files; make -f /dir <<
165 # <<
166 # If you want to save output files in a differ <<
167 # two syntaxes to specify it. <<
168 # <<
169 # 1) O= <<
170 # Use "make O=dir/to/store/output/files/" <<
171 # 170 #
172 # 2) Set KBUILD_OUTPUT !! 171 # Use 'make C=1' to enable checking of only re-compiled files.
173 # Set the environment variable KBUILD_OUTPUT t !! 172 # Use 'make C=2' to enable checking of *all* source files, regardless
174 # export KBUILD_OUTPUT=dir/to/store/output/fil !! 173 # of whether they are re-compiled or not.
175 # 174 #
176 # The O= assignment takes precedence over the !! 175 # See the file "Documentation/dev-tools/sparse.rst" for more details,
177 # variable. !! 176 # including where to get the "sparse" utility.
178 177
179 # Do we want to change the working directory? !! 178 ifeq ("$(origin C)", "command line")
180 ifeq ("$(origin O)", "command line") !! 179 KBUILD_CHECKSRC = $(C)
181 KBUILD_OUTPUT := $(O) <<
182 endif 180 endif
183 !! 181 ifndef KBUILD_CHECKSRC
184 ifneq ($(KBUILD_OUTPUT),) !! 182 KBUILD_CHECKSRC = 0
185 # $(realpath ...) gets empty if the path does <<
186 $(shell mkdir -p "$(KBUILD_OUTPUT)") <<
187 # $(realpath ...) resolves symlinks <<
188 abs_objtree := $(realpath $(KBUILD_OUTPUT)) <<
189 $(if $(abs_objtree),,$(error failed to create <<
190 endif # ifneq ($(KBUILD_OUTPUT),) <<
191 <<
192 ifneq ($(words $(subst :, ,$(abs_srctree))), 1 <<
193 $(error source directory cannot contain spaces <<
194 endif 183 endif
195 184
196 export sub_make_done := 1 !! 185 # Use make M=dir to specify directory of external module to build
197 !! 186 # Old syntax make ... SUBDIRS=$PWD is still supported
198 endif # sub_make_done !! 187 # Setting the environment variable KBUILD_EXTMOD take precedence
199 !! 188 ifdef SUBDIRS
200 ifeq ($(abs_objtree),$(CURDIR)) !! 189 KBUILD_EXTMOD ?= $(SUBDIRS)
201 # Suppress "Entering directory ..." if we are <<
202 no-print-directory := --no-print-directory <<
203 else <<
204 # Recursion to show "Entering directory ..." <<
205 need-sub-make := 1 <<
206 endif 190 endif
207 191
208 ifeq ($(filter --no-print-directory, $(MAKEFLA !! 192 ifeq ("$(origin M)", "command line")
209 # If --no-print-directory is unset, recurse on !! 193 KBUILD_EXTMOD := $(M)
210 # You may end up recursing into __sub-make twi <<
211 # behavior change in GNU Make 4.4.1. <<
212 need-sub-make := 1 <<
213 endif 194 endif
214 195
215 ifeq ($(need-sub-make),1) !! 196 ifeq ($(KBUILD_SRC),)
216 <<
217 PHONY += $(MAKECMDGOALS) __sub-make <<
218 <<
219 $(filter-out $(this-makefile), $(MAKECMDGOALS) <<
220 @: <<
221 <<
222 # Invoke a second make in the output directory <<
223 __sub-make: <<
224 $(Q)$(MAKE) $(no-print-directory) -C $ <<
225 -f $(abs_srctree)/Makefile $(MAKECMDGO <<
226 <<
227 else # need-sub-make <<
228 <<
229 # We process the rest of the Makefile if this <<
230 <<
231 ifeq ($(abs_srctree),$(abs_objtree)) <<
232 # building in the source tree 197 # building in the source tree
233 srctree := . 198 srctree := .
234 building_out_of_srctree := <<
235 else 199 else
236 ifeq ($(abs_srctree)/,$(dir $(abs_objt !! 200 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
237 # building in a subdirectory o 201 # building in a subdirectory of the source tree
238 srctree := .. 202 srctree := ..
239 else 203 else
240 srctree := $(abs_srctree) !! 204 srctree := $(KBUILD_SRC)
241 endif 205 endif
242 building_out_of_srctree := 1 <<
243 endif 206 endif
244 207
245 ifneq ($(KBUILD_ABS_SRCTREE),) !! 208 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
246 srctree := $(abs_srctree) <<
247 endif <<
248 209
249 objtree := . 210 objtree := .
>> 211 src := $(srctree)
>> 212 obj := $(objtree)
250 213
251 VPATH := !! 214 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
252 215
253 ifeq ($(KBUILD_EXTMOD),) !! 216 export srctree objtree VPATH
254 ifdef building_out_of_srctree <<
255 VPATH := $(srctree) <<
256 endif <<
257 endif <<
258 <<
259 export building_out_of_srctree srctree objtree <<
260 217
261 # To make sure we do not include .config for a 218 # To make sure we do not include .config for any of the *config targets
262 # catch them early, and hand them over to scri 219 # catch them early, and hand them over to scripts/kconfig/Makefile
263 # It is allowed to specify more targets when c 220 # It is allowed to specify more targets when calling make, including
264 # mixing *config targets and build targets. 221 # mixing *config targets and build targets.
265 # For example 'make oldconfig all'. 222 # For example 'make oldconfig all'.
266 # Detect when mixed targets is specified, and 223 # Detect when mixed targets is specified, and make a second invocation
267 # of make so .config is not included in this c 224 # of make so .config is not included in this case either (for *config).
268 225
269 version_h := include/generated/uapi/linux/vers 226 version_h := include/generated/uapi/linux/version.h
>> 227 old_version_h := include/linux/version.h
270 228
271 clean-targets := %clean mrproper cleandocs 229 clean-targets := %clean mrproper cleandocs
272 no-dot-config-targets := $(clean-targets) \ 230 no-dot-config-targets := $(clean-targets) \
273 cscope gtags TAGS tag 231 cscope gtags TAGS tags help% %docs check% coccicheck \
274 $(version_h) headers !! 232 $(version_h) headers_% archheaders archscripts \
275 %asm-generic kernelve !! 233 %asm-generic kernelversion %src-pkg
276 outputmakefile rustav !! 234 no-sync-config-targets := $(no-dot-config-targets) install %install \
277 no-sync-config-targets := $(no-dot-config-targ !! 235 kernelrelease
278 image_name !! 236
279 single-targets := %.a %.i %.ko %.lds %.ll %.ls !! 237 config-targets := 0
280 !! 238 mixed-targets := 0
281 config-build := !! 239 dot-config := 1
282 mixed-build := !! 240 may-sync-config := 1
283 need-config := 1 <<
284 may-sync-config := 1 <<
285 single-build := <<
286 241
287 ifneq ($(filter $(no-dot-config-targets), $(MA 242 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
288 ifeq ($(filter-out $(no-dot-config-targets !! 243 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
289 need-config := !! 244 dot-config := 0
290 endif !! 245 endif
291 endif 246 endif
292 247
293 ifneq ($(filter $(no-sync-config-targets), $(M 248 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
294 ifeq ($(filter-out $(no-sync-config-target !! 249 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
295 may-sync-config := !! 250 may-sync-config := 0
296 endif !! 251 endif
297 endif 252 endif
298 253
299 need-compiler := $(may-sync-config) <<
300 <<
301 ifneq ($(KBUILD_EXTMOD),) 254 ifneq ($(KBUILD_EXTMOD),)
302 may-sync-config := !! 255 may-sync-config := 0
303 endif 256 endif
304 257
305 ifeq ($(KBUILD_EXTMOD),) 258 ifeq ($(KBUILD_EXTMOD),)
306 ifneq ($(filter %config,$(MAKECMDGOALS)),) !! 259 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
307 config-build := 1 !! 260 config-targets := 1
308 ifneq ($(words $(MAKECMDGOALS)),1) !! 261 ifneq ($(words $(MAKECMDGOALS)),1)
309 mixed-build := 1 !! 262 mixed-targets := 1
>> 263 endif
310 endif 264 endif
311 endif <<
312 endif <<
313 <<
314 # We cannot build single targets and the other <<
315 ifneq ($(filter $(single-targets), $(MAKECMDGO <<
316 single-build := 1 <<
317 ifneq ($(filter-out $(single-targets), $(M <<
318 mixed-build := 1 <<
319 endif <<
320 endif 265 endif
321 266
322 # For "make -j clean all", "make -j mrproper d 267 # For "make -j clean all", "make -j mrproper defconfig all", etc.
323 ifneq ($(filter $(clean-targets),$(MAKECMDGOAL 268 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
324 ifneq ($(filter-out $(clean-targets),$(MAK !! 269 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
325 mixed-build := 1 !! 270 mixed-targets := 1
326 endif !! 271 endif
327 endif 272 endif
328 273
329 # install and modules_install need also be pro 274 # install and modules_install need also be processed one by one
330 ifneq ($(filter install,$(MAKECMDGOALS)),) 275 ifneq ($(filter install,$(MAKECMDGOALS)),)
331 ifneq ($(filter modules_install,$(MAKECMDG !! 276 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
332 mixed-build := 1 !! 277 mixed-targets := 1
333 endif !! 278 endif
334 endif 279 endif
335 280
336 ifdef mixed-build !! 281 ifeq ($(mixed-targets),1)
337 # ============================================ 282 # ===========================================================================
338 # We're called with mixed targets (*config and 283 # We're called with mixed targets (*config and build targets).
339 # Handle them one by one. 284 # Handle them one by one.
340 285
341 PHONY += $(MAKECMDGOALS) __build_one_by_one 286 PHONY += $(MAKECMDGOALS) __build_one_by_one
342 287
343 $(MAKECMDGOALS): __build_one_by_one !! 288 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
344 @: 289 @:
345 290
346 __build_one_by_one: 291 __build_one_by_one:
347 $(Q)set -e; \ 292 $(Q)set -e; \
348 for i in $(MAKECMDGOALS); do \ 293 for i in $(MAKECMDGOALS); do \
349 $(MAKE) -f $(srctree)/Makefile 294 $(MAKE) -f $(srctree)/Makefile $$i; \
350 done 295 done
351 296
352 else # !mixed-build !! 297 else
353 298
354 include $(srctree)/scripts/Kbuild.include !! 299 # We need some generic definitions (do not try to remake the file).
>> 300 scripts/Kbuild.include: ;
>> 301 include scripts/Kbuild.include
355 302
356 # Read KERNELRELEASE from include/config/kerne 303 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
357 KERNELRELEASE = $(call read-file, include/conf !! 304 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
358 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),. 305 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
359 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEA 306 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
360 307
361 include $(srctree)/scripts/subarch.include !! 308 include scripts/subarch.include
362 309
363 # Cross compiling and selecting different set 310 # Cross compiling and selecting different set of gcc/bin-utils
364 # -------------------------------------------- 311 # ---------------------------------------------------------------------------
365 # 312 #
366 # When performing cross compilation for other 313 # When performing cross compilation for other architectures ARCH shall be set
367 # to the target architecture. (See arch/* for 314 # to the target architecture. (See arch/* for the possibilities).
368 # ARCH can be set during invocation of make: 315 # ARCH can be set during invocation of make:
369 # make ARCH=arm64 !! 316 # make ARCH=ia64
370 # Another way is to have ARCH set in the envir 317 # Another way is to have ARCH set in the environment.
371 # The default ARCH is the host where make is e 318 # The default ARCH is the host where make is executed.
372 319
373 # CROSS_COMPILE specify the prefix used for al 320 # CROSS_COMPILE specify the prefix used for all executables used
374 # during compilation. Only gcc and related bin 321 # during compilation. Only gcc and related bin-utils executables
375 # are prefixed with $(CROSS_COMPILE). 322 # are prefixed with $(CROSS_COMPILE).
376 # CROSS_COMPILE can be set on the command line 323 # CROSS_COMPILE can be set on the command line
377 # make CROSS_COMPILE=aarch64-linux-gnu- !! 324 # make CROSS_COMPILE=ia64-linux-
378 # Alternatively CROSS_COMPILE can be set in th 325 # Alternatively CROSS_COMPILE can be set in the environment.
379 # Default value for CROSS_COMPILE is not to pr 326 # Default value for CROSS_COMPILE is not to prefix executables
380 # Note: Some architectures assign CROSS_COMPIL 327 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
381 ARCH ?= $(SUBARCH) 328 ARCH ?= $(SUBARCH)
382 329
383 # Architecture as present in compile.h 330 # Architecture as present in compile.h
384 UTS_MACHINE := $(ARCH) 331 UTS_MACHINE := $(ARCH)
385 SRCARCH := $(ARCH) 332 SRCARCH := $(ARCH)
386 333
387 # Additional ARCH settings for x86 334 # Additional ARCH settings for x86
388 ifeq ($(ARCH),i386) 335 ifeq ($(ARCH),i386)
389 SRCARCH := x86 336 SRCARCH := x86
390 endif 337 endif
391 ifeq ($(ARCH),x86_64) 338 ifeq ($(ARCH),x86_64)
392 SRCARCH := x86 339 SRCARCH := x86
393 endif 340 endif
394 341
395 # Additional ARCH settings for sparc 342 # Additional ARCH settings for sparc
396 ifeq ($(ARCH),sparc32) 343 ifeq ($(ARCH),sparc32)
397 SRCARCH := sparc 344 SRCARCH := sparc
398 endif 345 endif
399 ifeq ($(ARCH),sparc64) 346 ifeq ($(ARCH),sparc64)
400 SRCARCH := sparc 347 SRCARCH := sparc
401 endif 348 endif
402 349
403 # Additional ARCH settings for parisc !! 350 # Additional ARCH settings for sh
404 ifeq ($(ARCH),parisc64) !! 351 ifeq ($(ARCH),sh64)
405 SRCARCH := parisc !! 352 SRCARCH := sh
406 endif <<
407 <<
408 export cross_compiling := <<
409 ifneq ($(SRCARCH),$(SUBARCH)) <<
410 cross_compiling := 1 <<
411 endif 353 endif
412 354
413 KCONFIG_CONFIG ?= .config 355 KCONFIG_CONFIG ?= .config
414 export KCONFIG_CONFIG 356 export KCONFIG_CONFIG
415 357
416 # SHELL used by kbuild 358 # SHELL used by kbuild
417 CONFIG_SHELL := sh !! 359 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
>> 360 else if [ -x /bin/bash ]; then echo /bin/bash; \
>> 361 else echo sh; fi ; fi)
418 362
419 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 363 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
420 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAG 364 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
421 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/d 365 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
422 366
423 ifneq ($(LLVM),) !! 367 HOSTCC = gcc
424 ifneq ($(filter %/,$(LLVM)),) !! 368 HOSTCXX = g++
425 LLVM_PREFIX := $(LLVM) !! 369 KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
426 else ifneq ($(filter -%,$(LLVM)),) !! 370 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
427 LLVM_SUFFIX := $(LLVM) !! 371 $(HOSTCFLAGS)
428 endif !! 372 KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
429 <<
430 HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) <<
431 HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) <<
432 else <<
433 HOSTCC = gcc <<
434 HOSTCXX = g++ <<
435 endif <<
436 HOSTRUSTC = rustc <<
437 HOSTPKG_CONFIG = pkg-config <<
438 <<
439 KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-proto <<
440 -O2 -fomit-frame-poin <<
441 KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) <<
442 KBUILD_USERLDFLAGS := $(USERLDFLAGS) <<
443 <<
444 # These flags apply to all Rust code in the tr <<
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 373 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
469 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOST 374 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
470 375
471 # Make variables (CC, etc...) 376 # Make variables (CC, etc...)
472 CPP = $(CC) -E !! 377 AS = $(CROSS_COMPILE)as
473 ifneq ($(LLVM),) <<
474 CC = $(LLVM_PREFIX)clang$(LLVM_SU <<
475 LD = $(LLVM_PREFIX)ld.lld$(LLVM_S <<
476 AR = $(LLVM_PREFIX)llvm-ar$(LLVM_ <<
477 NM = $(LLVM_PREFIX)llvm-nm$(LLVM_ <<
478 OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$( <<
479 OBJDUMP = $(LLVM_PREFIX)llvm-objdump$( <<
480 READELF = $(LLVM_PREFIX)llvm-readelf$( <<
481 STRIP = $(LLVM_PREFIX)llvm-strip$(LL <<
482 else <<
483 CC = $(CROSS_COMPILE)gcc <<
484 LD = $(CROSS_COMPILE)ld 378 LD = $(CROSS_COMPILE)ld
>> 379 CC = $(CROSS_COMPILE)gcc
>> 380 CPP = $(CC) -E
485 AR = $(CROSS_COMPILE)ar 381 AR = $(CROSS_COMPILE)ar
486 NM = $(CROSS_COMPILE)nm 382 NM = $(CROSS_COMPILE)nm
>> 383 STRIP = $(CROSS_COMPILE)strip
487 OBJCOPY = $(CROSS_COMPILE)objcopy 384 OBJCOPY = $(CROSS_COMPILE)objcopy
488 OBJDUMP = $(CROSS_COMPILE)objdump 385 OBJDUMP = $(CROSS_COMPILE)objdump
489 READELF = $(CROSS_COMPILE)readelf <<
490 STRIP = $(CROSS_COMPILE)strip <<
491 endif <<
492 RUSTC = rustc <<
493 RUSTDOC = rustdoc <<
494 RUSTFMT = rustfmt <<
495 CLIPPY_DRIVER = clippy-driver <<
496 BINDGEN = bindgen <<
497 PAHOLE = pahole <<
498 RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve <<
499 LEX = flex 386 LEX = flex
500 YACC = bison 387 YACC = bison
501 AWK = awk 388 AWK = awk
>> 389 GENKSYMS = scripts/genksyms/genksyms
502 INSTALLKERNEL := installkernel 390 INSTALLKERNEL := installkernel
>> 391 DEPMOD = /sbin/depmod
503 PERL = perl 392 PERL = perl
>> 393 PYTHON = python
>> 394 PYTHON2 = python2
504 PYTHON3 = python3 395 PYTHON3 = python3
505 CHECK = sparse 396 CHECK = sparse
506 BASH = bash <<
507 KGZIP = gzip <<
508 KBZIP2 = bzip2 <<
509 KLZOP = lzop <<
510 LZMA = lzma <<
511 LZ4 = lz4c <<
512 XZ = xz <<
513 ZSTD = zstd <<
514 397
515 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC 398 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
516 -Wbitwise -Wno-return-void - 399 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
517 NOSTDINC_FLAGS := !! 400 NOSTDINC_FLAGS =
518 CFLAGS_MODULE = 401 CFLAGS_MODULE =
519 RUSTFLAGS_MODULE = <<
520 AFLAGS_MODULE = 402 AFLAGS_MODULE =
521 LDFLAGS_MODULE = 403 LDFLAGS_MODULE =
522 CFLAGS_KERNEL = 404 CFLAGS_KERNEL =
523 RUSTFLAGS_KERNEL = <<
524 AFLAGS_KERNEL = 405 AFLAGS_KERNEL =
525 LDFLAGS_vmlinux = 406 LDFLAGS_vmlinux =
526 407
527 # Use USERINCLUDE when you must reference the 408 # Use USERINCLUDE when you must reference the UAPI directories only.
528 USERINCLUDE := \ 409 USERINCLUDE := \
529 -I$(srctree)/arch/$(SRCARCH)/i 410 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
530 -I$(objtree)/arch/$(SRCARCH)/i 411 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
531 -I$(srctree)/include/uapi \ 412 -I$(srctree)/include/uapi \
532 -I$(objtree)/include/generated 413 -I$(objtree)/include/generated/uapi \
533 -include $(srctree)/include/li <<
534 -include $(srctree)/include/li 414 -include $(srctree)/include/linux/kconfig.h
535 415
536 # Use LINUXINCLUDE when you must reference the 416 # Use LINUXINCLUDE when you must reference the include/ directory.
537 # Needed to be compatible with the O= option 417 # Needed to be compatible with the O= option
538 LINUXINCLUDE := \ 418 LINUXINCLUDE := \
539 -I$(srctree)/arch/$(SRCARCH)/i 419 -I$(srctree)/arch/$(SRCARCH)/include \
540 -I$(objtree)/arch/$(SRCARCH)/i 420 -I$(objtree)/arch/$(SRCARCH)/include/generated \
541 $(if $(building_out_of_srctree !! 421 $(if $(KBUILD_SRC), -I$(srctree)/include) \
542 -I$(objtree)/include \ 422 -I$(objtree)/include \
543 $(USERINCLUDE) 423 $(USERINCLUDE)
544 424
545 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE !! 425 KBUILD_AFLAGS := -D__ASSEMBLY__
546 !! 426 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
547 KBUILD_CFLAGS := !! 427 -fno-strict-aliasing -fno-common -fshort-wchar \
548 KBUILD_CFLAGS += -std=gnu11 !! 428 -Werror-implicit-function-declaration \
549 KBUILD_CFLAGS += -fshort-wchar !! 429 -Wno-format-security \
550 KBUILD_CFLAGS += -funsigned-char !! 430 -std=gnu89
551 KBUILD_CFLAGS += -fno-common <<
552 KBUILD_CFLAGS += -fno-PIE <<
553 KBUILD_CFLAGS += -fno-strict-aliasing <<
554 <<
555 KBUILD_CPPFLAGS := -D__KERNEL__ 431 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 := 432 KBUILD_AFLAGS_KERNEL :=
565 KBUILD_CFLAGS_KERNEL := 433 KBUILD_CFLAGS_KERNEL :=
566 KBUILD_RUSTFLAGS_KERNEL := <<
567 KBUILD_AFLAGS_MODULE := -DMODULE 434 KBUILD_AFLAGS_MODULE := -DMODULE
568 KBUILD_CFLAGS_MODULE := -DMODULE 435 KBUILD_CFLAGS_MODULE := -DMODULE
569 KBUILD_RUSTFLAGS_MODULE := --cfg MODULE !! 436 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
570 KBUILD_LDFLAGS_MODULE := <<
571 KBUILD_LDFLAGS := 437 KBUILD_LDFLAGS :=
572 CLANG_FLAGS := !! 438 GCC_PLUGINS_CFLAGS :=
573 439
574 ifeq ($(KBUILD_CLIPPY),1) !! 440 export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
575 RUSTC_OR_CLIPPY_QUIET := CLIPPY !! 441 export CPP AR NM STRIP OBJCOPY OBJDUMP KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
576 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) !! 442 export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
577 else !! 443 export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
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 <<
591 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS <<
592 export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS <<
593 444
594 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINC 445 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
595 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODU 446 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
596 export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTF !! 447 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
597 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODU 448 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
598 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODU !! 449 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
599 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERN !! 450 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
>> 451 export KBUILD_ARFLAGS
>> 452
>> 453 # When compiling out-of-tree modules, put MODVERDIR in the module
>> 454 # tree rather than in the kernel tree. The kernel tree might
>> 455 # even be read-only.
>> 456 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
600 457
601 # Files to ignore in find ... statements 458 # Files to ignore in find ... statements
602 459
603 export RCS_FIND_IGNORE := \( -name SCCS -o -na 460 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
604 -name CVS -o -name . 461 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
605 -prune -o 462 -prune -o
>> 463 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
>> 464 --exclude CVS --exclude .pc --exclude .hg --exclude .git
606 465
607 # ============================================ 466 # ===========================================================================
608 # Rules shared between *config targets and bui 467 # Rules shared between *config targets and build targets
609 468
610 # Basic helpers built in scripts/basic/ 469 # Basic helpers built in scripts/basic/
611 PHONY += scripts_basic 470 PHONY += scripts_basic
612 scripts_basic: 471 scripts_basic:
613 $(Q)$(MAKE) $(build)=scripts/basic 472 $(Q)$(MAKE) $(build)=scripts/basic
>> 473 $(Q)rm -f .tmp_quiet_recordmcount
>> 474
>> 475 # To avoid any implicit rule to kick in, define an empty command.
>> 476 scripts/basic/%: scripts_basic ;
614 477
615 PHONY += outputmakefile 478 PHONY += outputmakefile
616 ifdef building_out_of_srctree <<
617 # Before starting out-of-tree build, make sure <<
618 # outputmakefile generates a Makefile in the o 479 # outputmakefile generates a Makefile in the output directory, if using a
619 # separate output directory. This allows conve 480 # separate output directory. This allows convenient use of make in the
620 # output directory. 481 # output directory.
621 # At the same time when output Makefile genera <<
622 # 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: 482 outputmakefile:
631 @if [ -f $(srctree)/.config -o \ !! 483 ifneq ($(KBUILD_SRC),)
632 -d $(srctree)/include/config <<
633 -d $(srctree)/arch/$(SRCARCH) <<
634 echo >&2 "***"; \ <<
635 echo >&2 "*** The source tree <<
636 echo >&2 "*** in $(abs_srctree <<
637 echo >&2 "***"; \ <<
638 false; \ <<
639 fi <<
640 $(Q)ln -fsn $(srctree) source 484 $(Q)ln -fsn $(srctree) source
641 $(call cmd,makefile) !! 485 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
642 $(Q)test -e .gitignore || \ <<
643 { echo "# this is build directory, ign <<
644 endif 486 endif
645 487
646 # The expansion should be delayed until arch/$ !! 488 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
647 # Some architectures define CROSS_COMPILE in a !! 489 ifneq ($(CROSS_COMPILE),)
648 # CC_VERSION_TEXT and RUSTC_VERSION_TEXT are r !! 490 CLANG_TARGET := --target=$(notdir $(CROSS_COMPILE:%-=%))
649 # need export), and from include/config/auto.c !! 491 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(LD)))
650 # upgrade. !! 492 CLANG_PREFIX := --prefix=$(GCC_TOOLCHAIN_DIR)
651 CC_VERSION_TEXT = $(subst $(pound),,$(shell LC !! 493 GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
652 RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell !! 494 endif
653 !! 495 ifneq ($(GCC_TOOLCHAIN),)
654 ifneq ($(findstring clang,$(CC_VERSION_TEXT)), !! 496 CLANG_GCC_TC := --gcc-toolchain=$(GCC_TOOLCHAIN)
655 include $(srctree)/scripts/Makefile.clang !! 497 endif
>> 498 KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) $(CLANG_PREFIX)
>> 499 KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) $(CLANG_PREFIX)
>> 500 KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
>> 501 KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
>> 502 endif
>> 503
>> 504 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
>> 505 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
>> 506 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
>> 507 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
>> 508 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
>> 509 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
>> 510 export RETPOLINE_CFLAGS
>> 511 export RETPOLINE_VDSO_CFLAGS
>> 512
>> 513 KBUILD_CFLAGS += $(call cc-option,-fno-PIE)
>> 514 KBUILD_AFLAGS += $(call cc-option,-fno-PIE)
>> 515
>> 516 # check for 'asm goto'
>> 517 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
>> 518 CC_HAVE_ASM_GOTO := 1
>> 519 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
>> 520 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
656 endif 521 endif
657 522
658 # Include this also for config targets because !! 523 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
659 # cc-cross-prefix to determine CROSS_COMPILE. !! 524 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
660 ifdef need-compiler !! 525 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
661 include $(srctree)/scripts/Makefile.compiler !! 526 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
662 endif !! 527 CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1)
663 528
664 ifdef config-build !! 529 ifeq ($(config-targets),1)
665 # ============================================ 530 # ===========================================================================
666 # *config targets only - make sure prerequisit 531 # *config targets only - make sure prerequisites are updated, and descend
667 # in scripts/kconfig to make the *config targe 532 # in scripts/kconfig to make the *config target
668 533
669 # Read arch-specific Makefile to set KBUILD_DE !! 534 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
670 # KBUILD_DEFCONFIG may point out an alternativ 535 # KBUILD_DEFCONFIG may point out an alternative default configuration
671 # used for 'make defconfig' 536 # used for 'make defconfig'
672 include $(srctree)/arch/$(SRCARCH)/Makefile !! 537 include arch/$(SRCARCH)/Makefile
673 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERS !! 538 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
674 539
675 config: outputmakefile scripts_basic FORCE !! 540 config: scripts_basic outputmakefile FORCE
676 $(Q)$(MAKE) $(build)=scripts/kconfig $ 541 $(Q)$(MAKE) $(build)=scripts/kconfig $@
677 542
678 %config: outputmakefile scripts_basic FORCE !! 543 %config: scripts_basic outputmakefile FORCE
679 $(Q)$(MAKE) $(build)=scripts/kconfig $ 544 $(Q)$(MAKE) $(build)=scripts/kconfig $@
680 545
681 else #!config-build !! 546 else
682 # ============================================ 547 # ===========================================================================
683 # Build targets only - this includes vmlinux, !! 548 # Build targets only - this includes vmlinux, arch specific targets, clean
684 # targets and others. In general all targets e 549 # targets and others. In general all targets except *config targets.
685 550
686 # If building an external module we do not car 551 # If building an external module we do not care about the all: rule
687 # but instead __all depend on modules !! 552 # but instead _all depend on modules
688 PHONY += all 553 PHONY += all
689 ifeq ($(KBUILD_EXTMOD),) 554 ifeq ($(KBUILD_EXTMOD),)
690 __all: all !! 555 _all: all
691 else 556 else
692 __all: modules !! 557 _all: modules
693 endif 558 endif
694 559
695 targets := <<
696 <<
697 # Decide whether to build built-in, modular, o 560 # Decide whether to build built-in, modular, or both.
698 # Normally, just do built-in. 561 # Normally, just do built-in.
699 562
700 KBUILD_MODULES := 563 KBUILD_MODULES :=
701 KBUILD_BUILTIN := 1 564 KBUILD_BUILTIN := 1
702 565
703 # If we have only "make modules", don't compil 566 # If we have only "make modules", don't compile built-in objects.
>> 567 # When we're building modules with modversions, we need to consider
>> 568 # the built-in objects during the descend as well, in order to
>> 569 # make sure the checksums are up to date before we record them.
>> 570
704 ifeq ($(MAKECMDGOALS),modules) 571 ifeq ($(MAKECMDGOALS),modules)
705 KBUILD_BUILTIN := !! 572 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
706 endif 573 endif
707 574
708 # If we have "make <whatever> modules", compil 575 # If we have "make <whatever> modules", compile modules
709 # in addition to whatever we do anyway. 576 # in addition to whatever we do anyway.
710 # Just "make" or "make all" shall build module 577 # Just "make" or "make all" shall build modules as well
711 578
712 ifneq ($(filter all modules nsdeps %compile_co !! 579 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
713 KBUILD_MODULES := 1 580 KBUILD_MODULES := 1
714 endif 581 endif
715 582
716 ifeq ($(MAKECMDGOALS),) 583 ifeq ($(MAKECMDGOALS),)
717 KBUILD_MODULES := 1 584 KBUILD_MODULES := 1
718 endif 585 endif
719 586
720 export KBUILD_MODULES KBUILD_BUILTIN 587 export KBUILD_MODULES KBUILD_BUILTIN
721 588
722 ifdef need-config <<
723 include include/config/auto.conf <<
724 endif <<
725 <<
726 ifeq ($(KBUILD_EXTMOD),) 589 ifeq ($(KBUILD_EXTMOD),)
727 # Objects we will link into vmlinux / subdirs 590 # Objects we will link into vmlinux / subdirs we need to visit
728 core-y := !! 591 init-y := init/
729 drivers-y := !! 592 drivers-y := drivers/ sound/ firmware/
>> 593 net-y := net/
730 libs-y := lib/ 594 libs-y := lib/
>> 595 core-y := usr/
>> 596 virt-y := virt/
731 endif # KBUILD_EXTMOD 597 endif # KBUILD_EXTMOD
732 598
>> 599 ifeq ($(dot-config),1)
>> 600 include include/config/auto.conf
>> 601 endif
>> 602
733 # The all: target is the default when no targe 603 # The all: target is the default when no target is given on the
734 # command line. 604 # command line.
735 # This allow a user to issue only 'make' to bu 605 # This allow a user to issue only 'make' to build a kernel including modules
736 # Defaults to vmlinux, but the arch makefile u 606 # Defaults to vmlinux, but the arch makefile usually adds further targets
737 all: vmlinux 607 all: vmlinux
738 608
739 CFLAGS_GCOV := -fprofile-arcs -ftest-cover !! 609 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \
740 ifdef CONFIG_CC_IS_GCC !! 610 $(call cc-option,-fno-tree-loop-im) \
741 CFLAGS_GCOV += -fno-tree-loop-im !! 611 $(call cc-disable-warning,maybe-uninitialized,)
742 endif <<
743 export CFLAGS_GCOV 612 export CFLAGS_GCOV
744 613
745 # The arch Makefiles can override CC_FLAGS_FTR 614 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
746 ifdef CONFIG_FUNCTION_TRACER 615 ifdef CONFIG_FUNCTION_TRACER
747 CC_FLAGS_FTRACE := -pg 616 CC_FLAGS_FTRACE := -pg
748 endif 617 endif
749 618
750 include $(srctree)/arch/$(SRCARCH)/Makefile !! 619 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
>> 620 # values of the respective KBUILD_* variables
>> 621 ARCH_CPPFLAGS :=
>> 622 ARCH_AFLAGS :=
>> 623 ARCH_CFLAGS :=
>> 624 include arch/$(SRCARCH)/Makefile
751 625
752 ifdef need-config !! 626 ifeq ($(dot-config),1)
753 ifdef may-sync-config !! 627 ifeq ($(may-sync-config),1)
754 # Read in dependencies to all Kconfig* files, 628 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
755 # changes are detected. This should be include 629 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
756 # because some architectures define CROSS_COMP 630 # because some architectures define CROSS_COMPILE there.
757 include include/config/auto.conf.cmd !! 631 -include include/config/auto.conf.cmd
758 632
759 $(KCONFIG_CONFIG): !! 633 # To avoid any implicit rule to kick in, define an empty command
760 @echo >&2 '***' !! 634 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
761 @echo >&2 '*** Configuration file "$@" <<
762 @echo >&2 '***' <<
763 @echo >&2 '*** Please run some configu <<
764 @echo >&2 '*** "make menuconfig" or "m <<
765 @echo >&2 '***' <<
766 @/bin/false <<
767 635
768 # The actual configuration files used during t 636 # The actual configuration files used during the build are stored in
769 # include/generated/ and include/config/. Upda 637 # include/generated/ and include/config/. Update them if .config is newer than
770 # include/config/auto.conf (which mirrors .con 638 # include/config/auto.conf (which mirrors .config).
771 # !! 639 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
772 # This exploits the 'multi-target pattern rule <<
773 # The syncconfig should be executed only once <<
774 # (Note: use the grouped target '&:' when we b <<
775 # <<
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 640 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
781 else # !may-sync-config !! 641 else
782 # External modules and some install targets ne 642 # External modules and some install targets need include/generated/autoconf.h
783 # and include/config/auto.conf but do not care 643 # and include/config/auto.conf but do not care if they are up-to-date.
784 # Use auto.conf to trigger the test 644 # Use auto.conf to trigger the test
785 PHONY += include/config/auto.conf 645 PHONY += include/config/auto.conf
786 646
787 include/config/auto.conf: 647 include/config/auto.conf:
788 @test -e include/generated/autoconf.h !! 648 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
789 echo >&2; 649 echo >&2; \
790 echo >&2 " ERROR: Kernel configuratio 650 echo >&2 " ERROR: Kernel configuration is invalid."; \
791 echo >&2 " include/generated/a 651 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
792 echo >&2 " Run 'make oldconfig 652 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
793 echo >&2 ; 653 echo >&2 ; \
794 /bin/false) 654 /bin/false)
795 655
796 endif # may-sync-config 656 endif # may-sync-config
797 endif # need-config !! 657 endif # $(dot-config)
798 658
799 KBUILD_CFLAGS += -fno-delete-null-pointer-ch !! 659 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
>> 660 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
>> 661 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
>> 662 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
>> 663 KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context)
>> 664
>> 665 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
>> 666 KBUILD_CFLAGS += $(call cc-option,-Oz,-Os)
>> 667 KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,)
>> 668 else
>> 669 ifdef CONFIG_PROFILE_ALL_BRANCHES
>> 670 KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,)
>> 671 else
>> 672 KBUILD_CFLAGS += -O2
>> 673 endif
>> 674 endif
800 675
801 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE !! 676 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
802 KBUILD_CFLAGS += -O2 !! 677 $(call cc-disable-warning,maybe-uninitialized,))
803 KBUILD_RUSTFLAGS += -Copt-level=2 <<
804 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE <<
805 KBUILD_CFLAGS += -Os <<
806 KBUILD_RUSTFLAGS += -Copt-level=s <<
807 endif <<
808 <<
809 # Always set `debug-assertions` and `overflow- <<
810 # depends on `opt-level` and `debug-assertions <<
811 KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $( <<
812 KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(C <<
813 678
814 # Tell gcc to never replace conditional load w 679 # 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 680 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
819 KBUILD_CFLAGS += $(call cc-option,-fno-allow !! 681
820 endif !! 682 include scripts/Makefile.kcov
>> 683 include scripts/Makefile.gcc-plugins
821 684
822 ifdef CONFIG_READABLE_ASM 685 ifdef CONFIG_READABLE_ASM
823 # Disable optimizations that make assembler li 686 # Disable optimizations that make assembler listings hard to read.
824 # reorder blocks reorders the control in the f 687 # reorder blocks reorders the control in the function
825 # ipa clone creates specialized cloned functio 688 # ipa clone creates specialized cloned functions
826 # partial inlining inlines only parts of funct 689 # partial inlining inlines only parts of functions
827 KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa- !! 690 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
>> 691 $(call cc-option,-fno-ipa-cp-clone,) \
>> 692 $(call cc-option,-fno-partial-inlining)
>> 693 endif
>> 694
>> 695 ifneq ($(CONFIG_FRAME_WARN),0)
>> 696 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
828 endif 697 endif
829 698
830 stackp-flags-y !! 699 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
831 stackp-flags-$(CONFIG_STACKPROTECTOR) 700 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
832 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) 701 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
833 702
834 KBUILD_CFLAGS += $(stackp-flags-y) 703 KBUILD_CFLAGS += $(stackp-flags-y)
835 704
836 KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarning !! 705 ifdef CONFIG_CC_IS_CLANG
837 KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) !! 706 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
>> 707 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
>> 708 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
>> 709 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
>> 710 # Quiet clang warning: comparison of unsigned expression < 0 is always false
>> 711 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
>> 712 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
>> 713 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
>> 714 # See modpost pattern 2
>> 715 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
>> 716 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
>> 717 else
>> 718
>> 719 # These warnings generated too much noise in a regular build.
>> 720 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
>> 721 KBUILD_CFLAGS += -Wno-unused-but-set-variable
>> 722 endif
838 723
>> 724 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
839 ifdef CONFIG_FRAME_POINTER 725 ifdef CONFIG_FRAME_POINTER
840 KBUILD_CFLAGS += -fno-omit-frame-pointer -fn 726 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
841 KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y <<
842 else 727 else
843 # Some targets (ARM with Thumb2, for example), 728 # Some targets (ARM with Thumb2, for example), can't be built with frame
844 # pointers. For those, we don't have FUNCTION 729 # pointers. For those, we don't have FUNCTION_TRACER automatically
845 # select FRAME_POINTER. However, FUNCTION_TRA 730 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
846 # incompatible with -fomit-frame-pointer with 731 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
847 # -fomit-frame-pointer with FUNCTION_TRACER. 732 # -fomit-frame-pointer with FUNCTION_TRACER.
848 # In the Rust target specification, "frame-poi <<
849 # to "may-omit". <<
850 ifndef CONFIG_FUNCTION_TRACER 733 ifndef CONFIG_FUNCTION_TRACER
851 KBUILD_CFLAGS += -fomit-frame-pointer 734 KBUILD_CFLAGS += -fomit-frame-pointer
852 endif 735 endif
853 endif 736 endif
854 737
855 # Initialize all stack variables with a 0xAA p !! 738 KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
856 ifdef CONFIG_INIT_STACK_ALL_PATTERN <<
857 KBUILD_CFLAGS += -ftrivial-auto-var-init=pat <<
858 endif <<
859 739
860 # Initialize all stack variables with a zero v !! 740 ifdef CONFIG_DEBUG_INFO
861 ifdef CONFIG_INIT_STACK_ALL_ZERO !! 741 ifdef CONFIG_DEBUG_INFO_SPLIT
862 KBUILD_CFLAGS += -ftrivial-auto-var-init=zer !! 742 KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
863 ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER !! 743 else
864 # https://github.com/llvm/llvm-project/issues/ !! 744 KBUILD_CFLAGS += -g
865 CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivi <<
866 export CC_AUTO_VAR_INIT_ZERO_ENABLER <<
867 KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENA <<
868 endif 745 endif
>> 746 KBUILD_AFLAGS += -Wa,-gdwarf-2
>> 747 endif
>> 748 ifdef CONFIG_DEBUG_INFO_DWARF4
>> 749 KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
869 endif 750 endif
870 751
871 # While VLAs have been removed, GCC produces u !! 752 ifdef CONFIG_DEBUG_INFO_REDUCED
872 # for the randomize_kstack_offset feature. Dis !! 753 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
873 KBUILD_CFLAGS += $(call cc-option, -fno-stac !! 754 $(call cc-option,-fno-var-tracking)
874 <<
875 # Clear used registers at func exit (to reduce <<
876 ifdef CONFIG_ZERO_CALL_USED_REGS <<
877 KBUILD_CFLAGS += -fzero-call-used-regs=used- <<
878 endif 755 endif
879 756
880 ifdef CONFIG_FUNCTION_TRACER 757 ifdef CONFIG_FUNCTION_TRACER
881 ifdef CONFIG_FTRACE_MCOUNT_USE_CC !! 758 ifdef CONFIG_FTRACE_MCOUNT_RECORD
882 CC_FLAGS_FTRACE += -mrecord-mcount !! 759 # gcc 5 supports generating the mcount tables directly
>> 760 ifeq ($(call cc-option-yn,-mrecord-mcount),y)
>> 761 CC_FLAGS_FTRACE += -mrecord-mcount
>> 762 export CC_USING_RECORD_MCOUNT := 1
>> 763 endif
883 ifdef CONFIG_HAVE_NOP_MCOUNT 764 ifdef CONFIG_HAVE_NOP_MCOUNT
884 ifeq ($(call cc-option-yn, -mnop-mcount),y 765 ifeq ($(call cc-option-yn, -mnop-mcount),y)
885 CC_FLAGS_FTRACE += -mnop-mcount 766 CC_FLAGS_FTRACE += -mnop-mcount
886 CC_FLAGS_USING += -DCC_USING_NOP_MCOU 767 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
887 endif 768 endif
888 endif 769 endif
889 endif 770 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 771 ifdef CONFIG_HAVE_FENTRY
902 # s390-linux-gnu-gcc did not support -mfentr <<
903 ifeq ($(call cc-option-yn, -mfentry),y) 772 ifeq ($(call cc-option-yn, -mfentry),y)
904 CC_FLAGS_FTRACE += -mfentry 773 CC_FLAGS_FTRACE += -mfentry
905 CC_FLAGS_USING += -DCC_USING_FENTRY 774 CC_FLAGS_USING += -DCC_USING_FENTRY
906 endif 775 endif
907 endif 776 endif
908 export CC_FLAGS_FTRACE 777 export CC_FLAGS_FTRACE
909 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLA 778 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
910 KBUILD_AFLAGS += $(CC_FLAGS_USING) 779 KBUILD_AFLAGS += $(CC_FLAGS_USING)
>> 780 ifdef CONFIG_DYNAMIC_FTRACE
>> 781 ifdef CONFIG_HAVE_C_RECORDMCOUNT
>> 782 BUILD_C_RECORDMCOUNT := y
>> 783 export BUILD_C_RECORDMCOUNT
>> 784 endif
>> 785 endif
911 endif 786 endif
912 787
913 # We trigger additional mismatches with less i 788 # We trigger additional mismatches with less inlining
914 ifdef CONFIG_DEBUG_SECTION_MISMATCH 789 ifdef CONFIG_DEBUG_SECTION_MISMATCH
915 KBUILD_CFLAGS += -fno-inline-functions-called- !! 790 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
916 endif 791 endif
917 792
918 # `rustc`'s `-Zfunction-sections` applies to d <<
919 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 793 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
920 KBUILD_CFLAGS_KERNEL += -ffunction-sections -f 794 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
921 KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections <<
922 LDFLAGS_vmlinux += --gc-sections 795 LDFLAGS_vmlinux += --gc-sections
923 endif 796 endif
924 797
925 ifdef CONFIG_SHADOW_CALL_STACK !! 798 # arch Makefile may override CC so keep this after arch Makefile is included
926 ifndef CONFIG_DYNAMIC_SCS !! 799 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
927 CC_FLAGS_SCS := -fsanitize=shadow-call-stac <<
928 KBUILD_CFLAGS += $(CC_FLAGS_SCS) <<
929 KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-st <<
930 endif <<
931 export CC_FLAGS_SCS <<
932 endif <<
933 <<
934 ifdef CONFIG_LTO_CLANG <<
935 ifdef CONFIG_LTO_CLANG_THIN <<
936 CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit <<
937 else <<
938 CC_FLAGS_LTO := -flto <<
939 endif <<
940 CC_FLAGS_LTO += -fvisibility=hidden <<
941 <<
942 # Limit inlining across translation units to r <<
943 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 <<
944 endif <<
945 <<
946 ifdef CONFIG_LTO <<
947 KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) <<
948 KBUILD_AFLAGS += -fno-lto <<
949 export CC_FLAGS_LTO <<
950 endif <<
951 <<
952 ifdef CONFIG_CFI_CLANG <<
953 CC_FLAGS_CFI := -fsanitize=kcfi <<
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 += $(CC_FLAGS_CFI) <<
965 export CC_FLAGS_CFI <<
966 endif <<
967 800
968 # Architectures can define flags to add/remove !! 801 # warn about C99 declaration after statement
969 CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UN !! 802 KBUILD_CFLAGS += -Wdeclaration-after-statement
970 export CC_FLAGS_FPU <<
971 export CC_FLAGS_NO_FPU <<
972 803
973 ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) !! 804 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
974 # Set the minimal function alignment. Use the !! 805 KBUILD_CFLAGS += $(call cc-option,-Wvla)
975 # -fmin-function-alignment if it is available, <<
976 # See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNME <<
977 ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT <<
978 KBUILD_CFLAGS += -fmin-function-alignment=$(CO <<
979 else <<
980 KBUILD_CFLAGS += -falign-functions=$(CONFIG_FU <<
981 endif <<
982 endif <<
983 806
984 # arch Makefile may override CC so keep this a !! 807 # disable pointer signed / unsigned warnings in gcc 4.0
985 NOSTDINC_FLAGS += -nostdinc !! 808 KBUILD_CFLAGS += -Wno-pointer-sign
986 809
987 # To gain proper coverage for CONFIG_UBSAN_BOU !! 810 # disable stringop warnings in gcc 8+
988 # the kernel uses only C99 flexible arrays for !! 811 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
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) + <<
996 812
997 # disable invalid "can't wrap" optimizations f 813 # disable invalid "can't wrap" optimizations for signed / pointers
998 KBUILD_CFLAGS += -fno-strict-overflow !! 814 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
>> 815
>> 816 # clang sets -fmerge-all-constants by default as optimization, but this
>> 817 # is non-conforming behavior for C and in fact breaks the kernel, so we
>> 818 # need to disable it here generally.
>> 819 KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants)
>> 820
>> 821 # for gcc -fno-merge-all-constants disables everything, but it is fine
>> 822 # to have actual conforming behavior enabled.
>> 823 KBUILD_CFLAGS += $(call cc-option,-fmerge-constants)
999 824
1000 # Make sure -fstack-check isn't enabled (like 825 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
1001 KBUILD_CFLAGS += -fno-stack-check !! 826 KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,)
1002 827
1003 # conserve stack if available 828 # conserve stack if available
1004 ifdef CONFIG_CC_IS_GCC !! 829 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
1005 KBUILD_CFLAGS += -fconserve-stack <<
1006 endif <<
1007 830
1008 # change __FILE__ to the relative path from t !! 831 # disallow errors like 'EXPORT_GPL(foo);' with missing header
1009 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-p !! 832 KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
1010 833
1011 # include additional Makefiles when needed !! 834 # require functions to have arguments in prototypes, not empty 'int foo()'
1012 include-y := scripts/Ma !! 835 KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
1013 include-$(CONFIG_DEBUG_INFO) += scripts/Ma <<
1014 include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Ma <<
1015 include-$(CONFIG_KASAN) += scripts/Ma <<
1016 include-$(CONFIG_KCSAN) += scripts/Ma <<
1017 include-$(CONFIG_KMSAN) += scripts/Ma <<
1018 include-$(CONFIG_UBSAN) += scripts/Ma <<
1019 include-$(CONFIG_KCOV) += scripts/Ma <<
1020 include-$(CONFIG_RANDSTRUCT) += scripts/Ma <<
1021 include-$(CONFIG_GCC_PLUGINS) += scripts/Ma <<
1022 <<
1023 include $(addprefix $(srctree)/, $(include-y) <<
1024 <<
1025 # scripts/Makefile.gcc-plugins is intentional <<
1026 # Do not add $(call cc-option,...) below this <<
1027 # from the clean source tree, the GCC plugins <<
1028 <<
1029 # Add user supplied CPPFLAGS, AFLAGS, CFLAGS <<
1030 KBUILD_CPPFLAGS += $(KCPPFLAGS) <<
1031 KBUILD_AFLAGS += $(KAFLAGS) <<
1032 KBUILD_CFLAGS += $(KCFLAGS) <<
1033 KBUILD_RUSTFLAGS += $(KRUSTFLAGS) <<
1034 <<
1035 KBUILD_LDFLAGS_MODULE += --build-id=sha1 <<
1036 LDFLAGS_vmlinux += --build-id=sha1 <<
1037 <<
1038 KBUILD_LDFLAGS += -z noexecstack <<
1039 ifeq ($(CONFIG_LD_IS_BFD),y) <<
1040 KBUILD_LDFLAGS += $(call ld-option,--no-warn <<
1041 endif <<
1042 836
1043 ifeq ($(CONFIG_STRIP_ASM_SYMS),y) !! 837 # Prohibit date/time macros, which would make the build non-deterministic
1044 LDFLAGS_vmlinux += -X !! 838 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
1045 endif <<
1046 839
1047 ifeq ($(CONFIG_RELR),y) !! 840 # enforce correct pointer usage
1048 # ld.lld before 15 did not support -z pack-re !! 841 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
1049 LDFLAGS_vmlinux += $(call ld-option,--pack-dy <<
1050 endif <<
1051 842
1052 # We never want expected sections to be place !! 843 # Require designated initializers for all marked structures
1053 # linker. All sections should be explicitly n !! 844 KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
1054 ifdef CONFIG_LD_ORPHAN_WARN !! 845
1055 LDFLAGS_vmlinux += --orphan-handling=$(CONFIG !! 846 # change __FILE__ to the relative path from the srctree
1056 endif !! 847 KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
1057 848
1058 # Align the bit size of userspace programs wi !! 849 # use the deterministic mode of AR if available
1059 KBUILD_USERCFLAGS += $(filter -m32 -m64 --ta !! 850 KBUILD_ARFLAGS := $(call ar-option,D)
1060 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --ta <<
1061 851
1062 # make the checker run with the right archite !! 852 include scripts/Makefile.kasan
1063 CHECKFLAGS += --arch=$(ARCH) !! 853 include scripts/Makefile.extrawarn
>> 854 include scripts/Makefile.ubsan
>> 855
>> 856 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
>> 857 # last assignments
>> 858 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
>> 859 KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
>> 860 KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
>> 861
>> 862 # Use --build-id when available.
>> 863 LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
>> 864 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
>> 865 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
>> 866
>> 867 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
>> 868 LDFLAGS_vmlinux += $(call ld-option, -X,)
>> 869 endif
1064 870
1065 # insure the checker run with the right endia 871 # insure the checker run with the right endianness
1066 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),- 872 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1067 873
1068 # the checker needs the correct machine size 874 # the checker needs the correct machine size
1069 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 875 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1070 876
1071 # Default kernel image to build when no speci 877 # Default kernel image to build when no specific target is given.
1072 # KBUILD_IMAGE may be overruled on the comman 878 # KBUILD_IMAGE may be overruled on the command line or
1073 # set in the environment 879 # set in the environment
1074 # Also any assignments in arch/$(ARCH)/Makefi 880 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1075 # this default value 881 # this default value
1076 export KBUILD_IMAGE ?= vmlinux 882 export KBUILD_IMAGE ?= vmlinux
1077 883
1078 # 884 #
1079 # INSTALL_PATH specifies where to place the u 885 # INSTALL_PATH specifies where to place the updated kernel and system map
1080 # images. Default is /boot, but you can set i 886 # images. Default is /boot, but you can set it to other values
1081 export INSTALL_PATH ?= /boot 887 export INSTALL_PATH ?= /boot
1082 888
1083 # 889 #
1084 # INSTALL_DTBS_PATH specifies a prefix for re 890 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1085 # Like INSTALL_MOD_PATH, it isn't defined in 891 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1086 # an argument if needed. Otherwise it default 892 # an argument if needed. Otherwise it defaults to the kernel install path
1087 # 893 #
1088 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/d 894 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1089 895
1090 # 896 #
1091 # INSTALL_MOD_PATH specifies a prefix to MODL 897 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1092 # relocations required by build roots. This 898 # relocations required by build roots. This is not defined in the
1093 # makefile but the argument can be passed to 899 # makefile but the argument can be passed to make if needed.
1094 # 900 #
1095 901
1096 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(K 902 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1097 export MODLIB 903 export MODLIB
1098 904
1099 PHONY += prepare0 !! 905 #
1100 !! 906 # INSTALL_MOD_STRIP, if defined, will cause modules to be
1101 export extmod_prefix = $(if $(KBUILD_EXTMOD), !! 907 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
1102 export MODORDER := $(extmod_prefix)modules.or !! 908 # the default option --strip-debug will be used. Otherwise,
1103 export MODULES_NSDEPS := $(extmod_prefix)modu !! 909 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
1104 !! 910
1105 ifeq ($(KBUILD_EXTMOD),) !! 911 ifdef INSTALL_MOD_STRIP
>> 912 ifeq ($(INSTALL_MOD_STRIP),1)
>> 913 mod_strip_cmd = $(STRIP) --strip-debug
>> 914 else
>> 915 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
>> 916 endif # INSTALL_MOD_STRIP=1
>> 917 else
>> 918 mod_strip_cmd = true
>> 919 endif # INSTALL_MOD_STRIP
>> 920 export mod_strip_cmd
>> 921
>> 922 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
>> 923 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
>> 924 # or CONFIG_MODULE_COMPRESS_XZ.
>> 925
>> 926 mod_compress_cmd = true
>> 927 ifdef CONFIG_MODULE_COMPRESS
>> 928 ifdef CONFIG_MODULE_COMPRESS_GZIP
>> 929 mod_compress_cmd = gzip -n -f
>> 930 endif # CONFIG_MODULE_COMPRESS_GZIP
>> 931 ifdef CONFIG_MODULE_COMPRESS_XZ
>> 932 mod_compress_cmd = xz -f
>> 933 endif # CONFIG_MODULE_COMPRESS_XZ
>> 934 endif # CONFIG_MODULE_COMPRESS
>> 935 export mod_compress_cmd
>> 936
>> 937 # Select initial ramdisk compression format, default is gzip(1).
>> 938 # This shall be used by the dracut(8) tool while creating an initramfs image.
>> 939 #
>> 940 INITRD_COMPRESS-y := gzip
>> 941 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
>> 942 INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
>> 943 INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
>> 944 INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
>> 945 INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
>> 946 # do not export INITRD_COMPRESS, since we didn't actually
>> 947 # choose a sane default compression above.
>> 948 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
1106 949
1107 build-dir := . !! 950 ifdef CONFIG_MODULE_SIG_ALL
1108 clean-dirs := $(sort . Documentation \ !! 951 $(eval $(call config_filename,MODULE_SIG_KEY))
1109 $(patsubst %/,%,$(filter <<
1110 $(drivers-) $(libs-)) <<
1111 <<
1112 export ARCH_CORE := $(core-y) <<
1113 export ARCH_LIB := $(filter %/, $(lib <<
1114 export ARCH_DRIVERS := $(drivers-y) $(dri <<
1115 # Externally visible symbols (used by link-vm <<
1116 952
1117 KBUILD_VMLINUX_OBJS := ./built-in.a !! 953 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
1118 ifdef CONFIG_MODULES <<
1119 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a <<
1120 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(lib <<
1121 else 954 else
1122 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, !! 955 mod_sign_cmd = true
1123 endif 956 endif
>> 957 export mod_sign_cmd
1124 958
1125 export KBUILD_VMLINUX_LIBS !! 959 ifdef CONFIG_STACK_VALIDATION
1126 export KBUILD_LDS := arch/$(SRCARCH) !! 960 has_libelf := $(call try-run,\
>> 961 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
>> 962 ifeq ($(has_libelf),1)
>> 963 objtool_target := tools/objtool FORCE
>> 964 else
>> 965 SKIP_STACK_VALIDATION := 1
>> 966 export SKIP_STACK_VALIDATION
>> 967 endif
>> 968 endif
>> 969
>> 970 PHONY += prepare0
1127 971
>> 972 ifeq ($(KBUILD_EXTMOD),)
>> 973 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
>> 974
>> 975 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
>> 976 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
>> 977 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
>> 978
>> 979 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
>> 980 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
>> 981
>> 982 init-y := $(patsubst %/, %/built-in.a, $(init-y))
>> 983 core-y := $(patsubst %/, %/built-in.a, $(core-y))
>> 984 drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y))
>> 985 net-y := $(patsubst %/, %/built-in.a, $(net-y))
>> 986 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
>> 987 libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
>> 988 virt-y := $(patsubst %/, %/built-in.a, $(virt-y))
>> 989
>> 990 # Externally visible symbols (used by link-vmlinux.sh)
>> 991 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
>> 992 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
>> 993 export KBUILD_VMLINUX_LIBS := $(libs-y1)
>> 994 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
>> 995 export LDFLAGS_vmlinux
>> 996 # used by scripts/package/Makefile
>> 997 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
>> 998
>> 999 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
>> 1000
>> 1001 # Recurse until adjust_autoksyms.sh is satisfied
>> 1002 PHONY += autoksyms_recursive
>> 1003 autoksyms_recursive: $(vmlinux-deps)
1128 ifdef CONFIG_TRIM_UNUSED_KSYMS 1004 ifdef CONFIG_TRIM_UNUSED_KSYMS
>> 1005 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
>> 1006 "$(MAKE) -f $(srctree)/Makefile vmlinux"
>> 1007 endif
>> 1008
1129 # For the kernel to actually contain only the 1009 # For the kernel to actually contain only the needed exported symbols,
1130 # we have to build modules as well to determi 1010 # we have to build modules as well to determine what those symbols are.
1131 KBUILD_MODULES := 1 !! 1011 # (this can be evaluated only once include/config/auto.conf has been included)
>> 1012 ifdef CONFIG_TRIM_UNUSED_KSYMS
>> 1013 KBUILD_MODULES := 1
1132 endif 1014 endif
1133 1015
1134 # '$(AR) mPi' needs 'T' to workaround the bug !! 1016 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 1017
1149 vmlinux.o modules.builtin.modinfo modules.bui !! 1018 $(autoksyms_h):
1150 @: !! 1019 $(Q)mkdir -p $(dir $@)
>> 1020 $(Q)touch $@
>> 1021
>> 1022 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
>> 1023
>> 1024 # Final link of vmlinux with optional arch pass after final link
>> 1025 cmd_link-vmlinux = \
>> 1026 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \
>> 1027 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
>> 1028
>> 1029 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
>> 1030 ifdef CONFIG_HEADERS_CHECK
>> 1031 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
>> 1032 endif
>> 1033 ifdef CONFIG_GDB_SCRIPTS
>> 1034 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
>> 1035 endif
>> 1036 +$(call if_changed,link-vmlinux)
1151 1037
1152 PHONY += vmlinux !! 1038 targets := vmlinux
1153 # LDFLAGS_vmlinux in the top Makefile defines !! 1039
1154 # not for decompressors. LDFLAGS_vmlinux in a !! 1040 # Build samples along the rest of the kernel. This needs headers_install.
1155 # unrelated; the decompressors just happen to !! 1041 ifdef CONFIG_SAMPLES
1156 # arch/*/boot/compressed/vmlinux. !! 1042 vmlinux-dirs += samples
1157 # Export LDFLAGS_vmlinux only to scripts/Make !! 1043 samples: headers_install
1158 # !! 1044 endif
1159 # _LDFLAGS_vmlinux is a workaround for the 'p <<
1160 # https://savannah.gnu.org/bugs/?61463 <<
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 1045
1168 # The actual objects are generated when desce 1046 # The actual objects are generated when descending,
1169 # make sure no implicit rule kicks in 1047 # make sure no implicit rule kicks in
1170 $(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $ !! 1048 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1171 1049
1172 ifeq ($(origin KERNELRELEASE),file) !! 1050 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1173 filechk_kernel.release = $(srctree)/scripts/s !! 1051 # Preset locale variables to speed up the build process. Limit locale
1174 else !! 1052 # tweaks to this spot to avoid wrong language settings when running
1175 filechk_kernel.release = echo $(KERNELRELEASE !! 1053 # make menuconfig etc.
1176 endif !! 1054 # Error messages still appears in the original language
>> 1055
>> 1056 PHONY += $(vmlinux-dirs)
>> 1057 $(vmlinux-dirs): prepare scripts
>> 1058 $(Q)$(MAKE) $(build)=$@ need-builtin=1
>> 1059
>> 1060 define filechk_kernel.release
>> 1061 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
>> 1062 endef
1177 1063
1178 # Store (new) KERNELRELEASE string in include 1064 # Store (new) KERNELRELEASE string in include/config/kernel.release
1179 include/config/kernel.release: FORCE !! 1065 include/config/kernel.release: $(srctree)/Makefile FORCE
1180 $(call filechk,kernel.release) 1066 $(call filechk,kernel.release)
1181 1067
1182 # Additional helpers built in scripts/ 1068 # Additional helpers built in scripts/
1183 # Carefully list dependencies so we do not tr 1069 # Carefully list dependencies so we do not try to build scripts twice
1184 # in parallel 1070 # in parallel
1185 PHONY += scripts 1071 PHONY += scripts
1186 scripts: scripts_basic scripts_dtc !! 1072 scripts: scripts_basic scripts_dtc asm-generic gcc-plugins $(autoksyms_h)
1187 $(Q)$(MAKE) $(build)=$(@) 1073 $(Q)$(MAKE) $(build)=$(@)
1188 1074
1189 # Things we need to do before we recursively 1075 # Things we need to do before we recursively start building the kernel
1190 # or the modules are listed in "prepare". 1076 # or the modules are listed in "prepare".
1191 # A multi level approach is used. prepareN is 1077 # A multi level approach is used. prepareN is processed before prepareN-1.
1192 # archprepare is used in arch Makefiles and w 1078 # archprepare is used in arch Makefiles and when processed asm symlink,
1193 # version.h and scripts_basic is processed / 1079 # version.h and scripts_basic is processed / created.
1194 1080
1195 PHONY += prepare archprepare !! 1081 PHONY += prepare archprepare prepare1 prepare2 prepare3
1196 1082
1197 archprepare: outputmakefile archheaders archs !! 1083 # prepare3 is used to check if we are building in a separate output directory,
1198 asm-generic $(version_h) include/gene !! 1084 # and if so do:
1199 include/generated/compile.h include/g !! 1085 # 1) Check that make has not been executed in the kernel src $(srctree)
1200 !! 1086 prepare3: include/config/kernel.release
1201 prepare0: archprepare !! 1087 ifneq ($(KBUILD_SRC),)
1202 $(Q)$(MAKE) $(build)=scripts/mod !! 1088 @$(kecho) ' Using $(srctree) as source for kernel'
1203 $(Q)$(MAKE) $(build)=. prepare !! 1089 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
>> 1090 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
>> 1091 echo >&2 " in the '$(srctree)' directory.";\
>> 1092 /bin/false; \
>> 1093 fi;
>> 1094 endif
>> 1095
>> 1096 # prepare2 creates a makefile if using a separate output directory.
>> 1097 # From this point forward, .config has been reprocessed, so any rules
>> 1098 # that need to depend on updated CONFIG_* values can be checked here.
>> 1099 prepare2: prepare3 outputmakefile asm-generic
1204 1100
1205 # All the preparing.. !! 1101 prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1206 prepare: prepare0 !! 1102 $(cmd_crmodverdir)
1207 ifdef CONFIG_RUST <<
1208 +$(Q)$(CONFIG_SHELL) $(srctree)/scrip <<
1209 $(Q)$(MAKE) $(build)=rust <<
1210 endif <<
1211 1103
1212 PHONY += remove-stale-files !! 1104 archprepare: archheaders archscripts prepare1 scripts_basic
1213 remove-stale-files: <<
1214 $(Q)$(srctree)/scripts/remove-stale-f <<
1215 1105
1216 # Support for using generic headers in asm-ge !! 1106 prepare0: archprepare gcc-plugins
1217 asm-generic := -f $(srctree)/scripts/Makefile !! 1107 $(Q)$(MAKE) $(build)=.
1218 1108
>> 1109 # All the preparing..
>> 1110 prepare: prepare0 prepare-objtool
>> 1111
>> 1112 # Support for using generic headers in asm-generic
1219 PHONY += asm-generic uapi-asm-generic 1113 PHONY += asm-generic uapi-asm-generic
1220 asm-generic: uapi-asm-generic 1114 asm-generic: uapi-asm-generic
1221 $(Q)$(MAKE) $(asm-generic)=arch/$(SRC !! 1115 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1222 generic=include/asm-generic !! 1116 src=asm obj=arch/$(SRCARCH)/include/generated/asm
1223 uapi-asm-generic: 1117 uapi-asm-generic:
1224 $(Q)$(MAKE) $(asm-generic)=arch/$(SRC !! 1118 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1225 generic=include/uapi/asm-generic !! 1119 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
>> 1120
>> 1121 PHONY += prepare-objtool
>> 1122 prepare-objtool: $(objtool_target)
>> 1123 ifeq ($(SKIP_STACK_VALIDATION),1)
>> 1124 ifdef CONFIG_UNWINDER_ORC
>> 1125 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
>> 1126 @false
>> 1127 else
>> 1128 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
>> 1129 endif
>> 1130 endif
1226 1131
1227 # Generate some files 1132 # Generate some files
1228 # ------------------------------------------- 1133 # ---------------------------------------------------------------------------
1229 1134
1230 # KERNELRELEASE can change from a few differe 1135 # KERNELRELEASE can change from a few different places, meaning version.h
1231 # needs to be updated, so this check is force 1136 # needs to be updated, so this check is forced on all builds
1232 1137
1233 uts_len := 64 1138 uts_len := 64
1234 define filechk_utsrelease.h 1139 define filechk_utsrelease.h
1235 if [ `echo -n "$(KERNELRELEASE)" | wc 1140 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1236 echo '"$(KERNELRELEASE)" exceeds $( 1141 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1237 exit 1; 1142 exit 1; \
1238 fi; 1143 fi; \
1239 echo \#define UTS_RELEASE \"$(KERNELR !! 1144 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1240 endef 1145 endef
1241 1146
1242 define filechk_version.h 1147 define filechk_version.h
1243 if [ $(SUBLEVEL) -gt 255 ]; then !! 1148 (echo \#define LINUX_VERSION_CODE $(shell \
1244 echo \#define LINUX_VERSION_C !! 1149 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1245 expr $(VERSION) \* 65536 + $( !! 1150 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 1151 endef
1256 1152
1257 $(version_h): private PATCHLEVEL := $(or $(PA <<
1258 $(version_h): private SUBLEVEL := $(or $(SUBL <<
1259 $(version_h): FORCE 1153 $(version_h): FORCE
1260 $(call filechk,version.h) 1154 $(call filechk,version.h)
>> 1155 $(Q)rm -f $(old_version_h)
1261 1156
1262 include/generated/utsrelease.h: include/confi 1157 include/generated/utsrelease.h: include/config/kernel.release FORCE
1263 $(call filechk,utsrelease.h) 1158 $(call filechk,utsrelease.h)
1264 1159
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 1160 PHONY += headerdep
1272 headerdep: 1161 headerdep:
1273 $(Q)find $(srctree)/include/ -name '* 1162 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1274 $(srctree)/scripts/headerdep.pl -I$(s 1163 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1275 1164
1276 # ------------------------------------------- 1165 # ---------------------------------------------------------------------------
1277 # Kernel headers 1166 # Kernel headers
1278 1167
1279 #Default location for installed headers 1168 #Default location for installed headers
1280 export INSTALL_HDR_PATH = $(objtree)/usr 1169 export INSTALL_HDR_PATH = $(objtree)/usr
1281 1170
1282 quiet_cmd_headers_install = INSTALL $(INSTALL !! 1171 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1283 cmd_headers_install = \ !! 1172 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1284 mkdir -p $(INSTALL_HDR_PATH); \ <<
1285 rsync -mrl --include='*/' --include=' <<
1286 usr/include $(INSTALL_HDR_PATH) <<
1287 <<
1288 PHONY += headers_install <<
1289 headers_install: headers <<
1290 $(call cmd,headers_install) <<
1291 <<
1292 PHONY += archheaders archscripts <<
1293 1173
1294 hdr-inst := -f $(srctree)/scripts/Makefile.he !! 1174 PHONY += archheaders
1295 !! 1175 archheaders:
1296 PHONY += headers <<
1297 headers: $(version_h) scripts_unifdef uapi-as <<
1298 $(if $(filter um, $(SRCARCH)), $(erro <<
1299 $(Q)$(MAKE) $(hdr-inst)=include/uapi <<
1300 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARC <<
1301 <<
1302 ifdef CONFIG_HEADERS_INSTALL <<
1303 prepare: headers <<
1304 endif <<
1305 1176
1306 PHONY += scripts_unifdef !! 1177 PHONY += archscripts
1307 scripts_unifdef: scripts_basic !! 1178 archscripts:
1308 $(Q)$(MAKE) $(build)=scripts scripts/ <<
1309 <<
1310 # ------------------------------------------- <<
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 1179
1342 # The tools build system is not a part of Kbu !! 1180 PHONY += __headers
1343 # its own unique issues. If you need to integ !! 1181 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1344 # please consider locating that tool outside !! 1182 $(Q)$(MAKE) $(build)=scripts build_unifdef
1345 # standard Kbuild "hostprogs" syntax instead !! 1183
1346 # here. See Documentation/kbuild/makefiles.rs !! 1184 PHONY += headers_install_all
>> 1185 headers_install_all:
>> 1186 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1347 1187
1348 PHONY += resolve_btfids_clean !! 1188 PHONY += headers_install
1349 !! 1189 headers_install: __headers
1350 resolve_btfids_O = $(abspath $(objtree))/tool !! 1190 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1351 !! 1191 $(error Headers not exportable for the $(SRCARCH) architecture))
1352 # tools/bpf/resolve_btfids directory might no !! 1192 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1353 # in output directory, skip its clean in that !! 1193 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1354 resolve_btfids_clean: !! 1194
1355 ifneq ($(wildcard $(resolve_btfids_O)),) !! 1195 PHONY += headers_check_all
1356 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/ !! 1196 headers_check_all: headers_install_all
1357 endif !! 1197 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1358 !! 1198
1359 # Clear a bunch of variables before executing !! 1199 PHONY += headers_check
1360 ifeq ($(quiet),silent_) !! 1200 headers_check: headers_install
1361 tools_silent=s !! 1201 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1362 endif !! 1202 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
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 1203
1372 # ------------------------------------------- 1204 # ---------------------------------------------------------------------------
1373 # Kernel selftest 1205 # Kernel selftest
1374 1206
1375 PHONY += kselftest 1207 PHONY += kselftest
1376 kselftest: headers !! 1208 kselftest:
1377 $(Q)$(MAKE) -C $(srctree)/tools/testi 1209 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1378 1210
1379 kselftest-%: headers FORCE !! 1211 PHONY += kselftest-clean
1380 $(Q)$(MAKE) -C $(srctree)/tools/testi !! 1212 kselftest-clean:
>> 1213 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1381 1214
1382 PHONY += kselftest-merge 1215 PHONY += kselftest-merge
1383 kselftest-merge: 1216 kselftest-merge:
1384 $(if $(wildcard $(objtree)/.config),, 1217 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1385 $(Q)find $(srctree)/tools/testing/sel !! 1218 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1386 xargs $(srctree)/scripts/kcon !! 1219 -m $(objtree)/.config \
1387 $(Q)$(MAKE) -f $(srctree)/Makefile ol !! 1220 $(srctree)/tools/testing/selftests/*/config
>> 1221 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1388 1222
1389 # ------------------------------------------- 1223 # ---------------------------------------------------------------------------
1390 # Devicetree files 1224 # Devicetree files
1391 1225
1392 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/ 1226 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1393 dtstree := arch/$(SRCARCH)/boot/dts 1227 dtstree := arch/$(SRCARCH)/boot/dts
1394 endif 1228 endif
1395 1229
1396 ifneq ($(dtstree),) 1230 ifneq ($(dtstree),)
1397 1231
1398 %.dtb: dtbs_prepare !! 1232 %.dtb: prepare3 scripts_dtc
1399 $(Q)$(MAKE) $(build)=$(dtstree) $(dts <<
1400 <<
1401 %.dtbo: dtbs_prepare <<
1402 $(Q)$(MAKE) $(build)=$(dtstree) $(dts 1233 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1403 1234
1404 PHONY += dtbs dtbs_prepare dtbs_install dtbs_ !! 1235 PHONY += dtbs dtbs_install
1405 dtbs: dtbs_prepare !! 1236 dtbs: prepare3 scripts_dtc
1406 $(Q)$(MAKE) $(build)=$(dtstree) need- !! 1237 $(Q)$(MAKE) $(build)=$(dtstree)
1407 <<
1408 # include/config/kernel.release is actually n <<
1409 # INSTALL_DTBS_PATH contains $(KERNELRELEASE) <<
1410 # dtbs_install depend on it as dtbs_install m <<
1411 dtbs_prepare: include/config/kernel.release s <<
1412 <<
1413 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)), <<
1414 export CHECK_DTBS=y <<
1415 endif <<
1416 <<
1417 ifneq ($(CHECK_DTBS),) <<
1418 dtbs_prepare: dt_binding_schemas <<
1419 endif <<
1420 <<
1421 dtbs_check: dtbs <<
1422 1238
1423 dtbs_install: 1239 dtbs_install:
1424 $(Q)$(MAKE) -f $(srctree)/scripts/Mak !! 1240 $(Q)$(MAKE) $(dtbinst)=$(dtstree)
1425 1241
1426 ifdef CONFIG_OF_EARLY_FLATTREE 1242 ifdef CONFIG_OF_EARLY_FLATTREE
1427 all: dtbs 1243 all: dtbs
1428 endif 1244 endif
1429 1245
1430 endif 1246 endif
1431 1247
1432 PHONY += scripts_dtc 1248 PHONY += scripts_dtc
1433 scripts_dtc: scripts_basic 1249 scripts_dtc: scripts_basic
1434 $(Q)$(MAKE) $(build)=scripts/dtc 1250 $(Q)$(MAKE) $(build)=scripts/dtc
1435 1251
1436 ifneq ($(filter dt_binding_check, $(MAKECMDGO <<
1437 export CHECK_DTBS=y <<
1438 endif <<
1439 <<
1440 PHONY += dt_binding_check dt_binding_schemas <<
1441 dt_binding_check: dt_binding_schemas scripts_ <<
1442 $(Q)$(MAKE) $(build)=Documentation/de <<
1443 <<
1444 dt_binding_schemas: <<
1445 $(Q)$(MAKE) $(build)=Documentation/de <<
1446 <<
1447 PHONY += dt_compatible_check <<
1448 dt_compatible_check: dt_binding_schemas <<
1449 $(Q)$(MAKE) $(build)=Documentation/de <<
1450 <<
1451 # ------------------------------------------- 1252 # ---------------------------------------------------------------------------
1452 # Modules 1253 # Modules
1453 1254
1454 ifdef CONFIG_MODULES 1255 ifdef CONFIG_MODULES
1455 1256
1456 # By default, build modules as well 1257 # By default, build modules as well
1457 1258
1458 all: modules 1259 all: modules
1459 1260
1460 # When we're building modules with modversion <<
1461 # the built-in objects during the descend as <<
1462 # make sure the checksums are up to date befo <<
1463 ifdef CONFIG_MODVERSIONS <<
1464 KBUILD_BUILTIN := 1 <<
1465 endif <<
1466 <<
1467 # Build modules 1261 # Build modules
1468 # 1262 #
>> 1263 # A module can be listed more than once in obj-m resulting in
>> 1264 # duplicate lines in modules.order files. Those are removed
>> 1265 # using awk while concatenating to the final file.
>> 1266
>> 1267 PHONY += modules
>> 1268 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
>> 1269 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
>> 1270 @$(kecho) ' Building modules, stage 2.';
>> 1271 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1469 1272
1470 # *.ko are usually independent of vmlinux, bu !! 1273 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1471 # is an exception. !! 1274 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1472 ifdef CONFIG_DEBUG_INFO_BTF_MODULES !! 1275
1473 KBUILD_BUILTIN := 1 !! 1276 %/modules.builtin: include/config/auto.conf include/config/tristate.conf
1474 modules: vmlinux !! 1277 $(Q)$(MAKE) $(modbuiltin)=$*
1475 endif <<
1476 1278
1477 modules: modules_prepare <<
1478 1279
1479 # Target to prepare building external modules 1280 # Target to prepare building external modules
1480 modules_prepare: prepare !! 1281 PHONY += modules_prepare
1481 $(Q)$(MAKE) $(build)=scripts scripts/ !! 1282 modules_prepare: prepare scripts
>> 1283
>> 1284 # Target to install modules
>> 1285 PHONY += modules_install
>> 1286 modules_install: _modinst_ _modinst_post
>> 1287
>> 1288 PHONY += _modinst_
>> 1289 _modinst_:
>> 1290 @rm -rf $(MODLIB)/kernel
>> 1291 @rm -f $(MODLIB)/source
>> 1292 @mkdir -p $(MODLIB)/kernel
>> 1293 @ln -s $(abspath $(srctree)) $(MODLIB)/source
>> 1294 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
>> 1295 rm -f $(MODLIB)/build ; \
>> 1296 ln -s $(CURDIR) $(MODLIB)/build ; \
>> 1297 fi
>> 1298 @cp -f $(objtree)/modules.order $(MODLIB)/
>> 1299 @cp -f $(objtree)/modules.builtin $(MODLIB)/
>> 1300 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
>> 1301
>> 1302 # This depmod is only for convenience to give the initial
>> 1303 # boot a modules.dep even before / is mounted read-write. However the
>> 1304 # boot script depmod is the master version.
>> 1305 PHONY += _modinst_post
>> 1306 _modinst_post: _modinst_
>> 1307 $(call cmd,depmod)
>> 1308
>> 1309 ifeq ($(CONFIG_MODULE_SIG), y)
>> 1310 PHONY += modules_sign
>> 1311 modules_sign:
>> 1312 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
>> 1313 endif
>> 1314
>> 1315 else # CONFIG_MODULES
>> 1316
>> 1317 # Modules not configured
>> 1318 # ---------------------------------------------------------------------------
>> 1319
>> 1320 PHONY += modules modules_install
>> 1321 modules modules_install:
>> 1322 @echo >&2
>> 1323 @echo >&2 "The present kernel configuration has modules disabled."
>> 1324 @echo >&2 "Type 'make config' and enable loadable module support."
>> 1325 @echo >&2 "Then build a kernel with module support enabled."
>> 1326 @echo >&2
>> 1327 @exit 1
1482 1328
1483 endif # CONFIG_MODULES 1329 endif # CONFIG_MODULES
1484 1330
1485 ### 1331 ###
1486 # Cleaning is done on three levels. 1332 # Cleaning is done on three levels.
1487 # make clean Delete most generated files 1333 # make clean Delete most generated files
1488 # Leave enough to build extern 1334 # Leave enough to build external modules
1489 # make mrproper Delete the current configura 1335 # make mrproper Delete the current configuration, and all generated files
1490 # make distclean Remove editor backup files, 1336 # make distclean Remove editor backup files, patch leftover files and the like
1491 1337
1492 # Directories & files removed with 'make clea 1338 # Directories & files removed with 'make clean'
1493 CLEAN_FILES += vmlinux.symvers modules-only.s !! 1339 CLEAN_DIRS += $(MODVERDIR) include/ksym
1494 modules.builtin modules.builti <<
1495 modules.builtin.ranges vmlinux <<
1496 compile_commands.json rust/tes <<
1497 rust-project.json .vmlinux.obj <<
1498 1340
1499 # Directories & files removed with 'make mrpr 1341 # Directories & files removed with 'make mrproper'
1500 MRPROPER_FILES += include/config include/gene !! 1342 MRPROPER_DIRS += include/config usr/include include/generated \
1501 arch/$(SRCARCH)/include/gen !! 1343 arch/*/include/generated .tmp_objdiff
1502 debian snap tar-install PKG !! 1344 MRPROPER_FILES += .config .config.old .version \
1503 .config .config.old .versio !! 1345 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1504 Module.symvers \ !! 1346 signing_key.pem signing_key.priv signing_key.x509 \
1505 certs/signing_key.pem \ !! 1347 x509.genkey extra_certificates signing_key.x509.keyid \
1506 certs/x509.genkey \ !! 1348 signing_key.x509.signer vmlinux-gdb.py
1507 vmlinux-gdb.py \ <<
1508 rpmbuild \ <<
1509 rust/libmacros.so <<
1510 1349
1511 # clean - Delete most, but leave enough to bu 1350 # clean - Delete most, but leave enough to build external modules
1512 # 1351 #
1513 clean: private rm-files := $(CLEAN_FILES) !! 1352 clean: rm-dirs := $(CLEAN_DIRS)
>> 1353 clean: rm-files := $(CLEAN_FILES)
>> 1354 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1514 1355
1515 PHONY += archclean vmlinuxclean !! 1356 PHONY += $(clean-dirs) clean archclean vmlinuxclean
>> 1357 $(clean-dirs):
>> 1358 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1516 1359
1517 vmlinuxclean: 1360 vmlinuxclean:
1518 $(Q)$(CONFIG_SHELL) $(srctree)/script 1361 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1519 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f 1362 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1520 1363
1521 clean: archclean vmlinuxclean resolve_btfids_ !! 1364 clean: archclean vmlinuxclean
1522 1365
1523 # mrproper - Delete all generated files, incl 1366 # mrproper - Delete all generated files, including .config
1524 # 1367 #
1525 mrproper: private rm-files := $(MRPROPER_FILE !! 1368 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
>> 1369 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1526 mrproper-dirs := $(addprefix _mrproper_, 1370 mrproper-dirs := $(addprefix _mrproper_,scripts)
1527 1371
1528 PHONY += $(mrproper-dirs) mrproper !! 1372 PHONY += $(mrproper-dirs) mrproper archmrproper
1529 $(mrproper-dirs): 1373 $(mrproper-dirs):
1530 $(Q)$(MAKE) $(clean)=$(patsubst _mrpr 1374 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1531 1375
1532 mrproper: clean $(mrproper-dirs) !! 1376 mrproper: clean archmrproper $(mrproper-dirs)
>> 1377 $(call cmd,rmdirs)
1533 $(call cmd,rmfiles) 1378 $(call cmd,rmfiles)
1534 @find . $(RCS_FIND_IGNORE) \ <<
1535 \( -name '*.rmeta' \) \ <<
1536 -type f -print | xargs rm -f <<
1537 1379
1538 # distclean 1380 # distclean
1539 # 1381 #
1540 PHONY += distclean 1382 PHONY += distclean
1541 1383
1542 distclean: mrproper 1384 distclean: mrproper
1543 @find . $(RCS_FIND_IGNORE) \ !! 1385 @find $(srctree) $(RCS_FIND_IGNORE) \
1544 \( -name '*.orig' -o -name '* 1386 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1545 -o -name '*.bak' -o -name '#* 1387 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1546 -o -name 'core' -o -name tags !! 1388 -o -name 'core' \) \
1547 -o -name GPATH -o -name GRTAG <<
1548 -type f -print | xargs rm -f 1389 -type f -print | xargs rm -f
1549 1390
1550 1391
1551 # Packaging of the kernel to various formats 1392 # Packaging of the kernel to various formats
1552 # ------------------------------------------- 1393 # ---------------------------------------------------------------------------
>> 1394 package-dir := scripts/package
1553 1395
1554 %src-pkg: FORCE 1396 %src-pkg: FORCE
1555 $(Q)$(MAKE) -f $(srctree)/scripts/Mak !! 1397 $(Q)$(MAKE) $(build)=$(package-dir) $@
1556 %pkg: include/config/kernel.release FORCE 1398 %pkg: include/config/kernel.release FORCE
1557 $(Q)$(MAKE) -f $(srctree)/scripts/Mak !! 1399 $(Q)$(MAKE) $(build)=$(package-dir) $@
>> 1400
1558 1401
1559 # Brief documentation of the typical targets 1402 # Brief documentation of the typical targets used
1560 # ------------------------------------------- 1403 # ---------------------------------------------------------------------------
1561 1404
1562 boards := $(wildcard $(srctree)/arch/$(SRCARC 1405 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1563 boards := $(sort $(notdir $(boards))) 1406 boards := $(sort $(notdir $(boards)))
1564 board-dirs := $(dir $(wildcard $(srctree)/arc 1407 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1565 board-dirs := $(sort $(notdir $(board-dirs:/= 1408 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1566 1409
1567 PHONY += help 1410 PHONY += help
1568 help: 1411 help:
1569 @echo 'Cleaning targets:' 1412 @echo 'Cleaning targets:'
1570 @echo ' clean - Remove mo 1413 @echo ' clean - Remove most generated files but keep the config and'
1571 @echo ' enough bu 1414 @echo ' enough build support to build external modules'
1572 @echo ' mrproper - Remove al 1415 @echo ' mrproper - Remove all generated files + config + various backup files'
1573 @echo ' distclean - mrproper 1416 @echo ' distclean - mrproper + remove editor backup and patch files'
1574 @echo '' 1417 @echo ''
>> 1418 @echo 'Configuration targets:'
1575 @$(MAKE) -f $(srctree)/scripts/kconfi 1419 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1576 @echo '' 1420 @echo ''
1577 @echo 'Other generic targets:' 1421 @echo 'Other generic targets:'
1578 @echo ' all - Build all 1422 @echo ' all - Build all targets marked with [*]'
1579 @echo '* vmlinux - Build the 1423 @echo '* vmlinux - Build the bare kernel'
1580 @echo '* modules - Build all 1424 @echo '* modules - Build all modules'
1581 @echo ' modules_install - Install a 1425 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1582 @echo ' vdso_install - Install u <<
1583 @echo ' dir/ - Build all 1426 @echo ' dir/ - Build all files in dir and below'
1584 @echo ' dir/file.[ois] - Build spe 1427 @echo ' dir/file.[ois] - Build specified target only'
1585 @echo ' dir/file.ll - Build the 1428 @echo ' dir/file.ll - Build the LLVM assembly file'
1586 @echo ' (requires 1429 @echo ' (requires compiler support for LLVM assembly generation)'
1587 @echo ' dir/file.lst - Build spe 1430 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1588 @echo ' (requires 1431 @echo ' (requires a recent binutils and recent build (System.map))'
1589 @echo ' dir/file.ko - Build mod 1432 @echo ' dir/file.ko - Build module including final link'
1590 @echo ' modules_prepare - Set up fo 1433 @echo ' modules_prepare - Set up for building external modules'
1591 @echo ' tags/TAGS - Generate 1434 @echo ' tags/TAGS - Generate tags file for editors'
1592 @echo ' cscope - Generate 1435 @echo ' cscope - Generate cscope index'
1593 @echo ' gtags - Generate 1436 @echo ' gtags - Generate GNU GLOBAL index'
1594 @echo ' kernelrelease - Output th 1437 @echo ' kernelrelease - Output the release version string (use with make -s)'
1595 @echo ' kernelversion - Output th 1438 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1596 @echo ' image_name - Output th 1439 @echo ' image_name - Output the image name (use with make -s)'
1597 @echo ' headers_install - Install s 1440 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1598 echo ' (default: 1441 echo ' (default: $(INSTALL_HDR_PATH))'; \
1599 echo '' 1442 echo ''
1600 @echo 'Static analysers:' 1443 @echo 'Static analysers:'
1601 @echo ' checkstack - Generate !! 1444 @echo ' checkstack - Generate a list of stack hogs'
1602 @echo ' with a st !! 1445 @echo ' namespacecheck - Name space analysis on compiled kernel'
1603 @echo ' versioncheck - Sanity ch 1446 @echo ' versioncheck - Sanity check on version.h usage'
1604 @echo ' includecheck - Check for 1447 @echo ' includecheck - Check for duplicate included header files'
1605 @echo ' export_report - List the 1448 @echo ' export_report - List the usages of all exported symbols'
>> 1449 @echo ' headers_check - Sanity check on exported headers'
1606 @echo ' headerdep - Detect in 1450 @echo ' headerdep - Detect inclusion cycles in headers'
1607 @echo ' coccicheck - Check wit 1451 @echo ' coccicheck - Check with Coccinelle'
1608 @echo ' clang-analyzer - Check wit <<
1609 @echo ' clang-tidy - Check wit <<
1610 @echo '' <<
1611 @echo 'Tools:' <<
1612 @echo ' nsdeps - Generate <<
1613 @echo '' 1452 @echo ''
1614 @echo 'Kernel selftest:' 1453 @echo 'Kernel selftest:'
1615 @echo ' kselftest - Build a !! 1454 @echo ' kselftest - Build and run kernel selftest (run as root)'
1616 @echo ' Build, !! 1455 @echo ' Build, install, and boot kernel before'
1617 @echo ' running !! 1456 @echo ' running kselftest on it'
1618 @echo ' Run as !! 1457 @echo ' kselftest-clean - Remove all generated kselftest files'
1619 @echo ' kselftest-all - Build k !! 1458 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing'
1620 @echo ' kselftest-install - Build a !! 1459 @echo ' .config.'
1621 @echo ' kselftest-clean - Remove <<
1622 @echo ' kselftest-merge - Merge a <<
1623 @echo ' kselfte <<
1624 @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 '' 1460 @echo ''
1643 @$(if $(dtstree), \ 1461 @$(if $(dtstree), \
1644 echo 'Devicetree:'; \ 1462 echo 'Devicetree:'; \
1645 echo '* dtbs - !! 1463 echo '* dtbs - Build device tree blobs for enabled boards'; \
1646 echo ' dtbs_install - !! 1464 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1647 echo ' dt_binding_check - <<
1648 echo ' dt_binding_schemas - <<
1649 echo ' dtbs_check - <<
1650 echo '') 1465 echo '')
1651 1466
1652 @echo 'Userspace tools targets:' 1467 @echo 'Userspace tools targets:'
1653 @echo ' use "make tools/help"' 1468 @echo ' use "make tools/help"'
1654 @echo ' or "cd tools; make help"' 1469 @echo ' or "cd tools; make help"'
1655 @echo '' 1470 @echo ''
1656 @echo 'Kernel packaging:' 1471 @echo 'Kernel packaging:'
1657 @$(MAKE) -f $(srctree)/scripts/Makefi !! 1472 @$(MAKE) $(build)=$(package-dir) help
1658 @echo '' 1473 @echo ''
1659 @echo 'Documentation targets:' 1474 @echo 'Documentation targets:'
1660 @$(MAKE) -f $(srctree)/Documentation/ 1475 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1661 @echo '' 1476 @echo ''
1662 @echo 'Architecture-specific targets !! 1477 @echo 'Architecture specific targets ($(SRCARCH)):'
1663 @$(or $(archhelp),\ !! 1478 @$(if $(archhelp),$(archhelp),\
1664 echo ' No architecture-speci !! 1479 echo ' No architecture specific help defined for $(SRCARCH)')
1665 @echo '' 1480 @echo ''
1666 @$(if $(boards), \ 1481 @$(if $(boards), \
1667 $(foreach b, $(boards), \ 1482 $(foreach b, $(boards), \
1668 printf " %-27s - Build for % !! 1483 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1669 echo '') 1484 echo '')
1670 @$(if $(board-dirs), \ 1485 @$(if $(board-dirs), \
1671 $(foreach b, $(board-dirs), \ 1486 $(foreach b, $(board-dirs), \
1672 printf " %-16s - Show %s-spe 1487 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1673 printf " %-16s - Show all of 1488 printf " %-16s - Show all of the above\\n" help-boards; \
1674 echo '') 1489 echo '')
1675 1490
1676 @echo ' make V=n [targets] 1: ver !! 1491 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1677 @echo ' 2: giv !! 1492 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1678 @echo ' V=1 an <<
1679 @echo ' make O=dir [targets] Locate 1493 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1680 @echo ' make C=1 [targets] Check !! 1494 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1681 @echo ' (spars <<
1682 @echo ' make C=2 [targets] Force 1495 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1683 @echo ' make RECORDMCOUNT_WARN=1 [t 1496 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1684 @echo ' make W=n [targets] Enable !! 1497 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1685 @echo ' 1: warnings w 1498 @echo ' 1: warnings which may be relevant and do not occur too often'
1686 @echo ' 2: warnings w 1499 @echo ' 2: warnings which occur quite often but may still be relevant'
1687 @echo ' 3: more obscu 1500 @echo ' 3: more obscure warnings, can most likely be ignored'
1688 @echo ' c: extra chec <<
1689 @echo ' e: warnings a <<
1690 @echo ' Multiple leve 1501 @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 '' 1502 @echo ''
1696 @echo 'Execute "make" or "make all" 1503 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1697 @echo 'For further info see the ./RE 1504 @echo 'For further info see the ./README file'
1698 1505
1699 1506
1700 help-board-dirs := $(addprefix help-,$(board- 1507 help-board-dirs := $(addprefix help-,$(board-dirs))
1701 1508
1702 help-boards: $(help-board-dirs) 1509 help-boards: $(help-board-dirs)
1703 1510
1704 boards-per-dir = $(sort $(notdir $(wildcard $ 1511 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1705 1512
1706 $(help-board-dirs): help-%: 1513 $(help-board-dirs): help-%:
1707 @echo 'Architecture-specific targets !! 1514 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1708 @$(if $(boards-per-dir), \ 1515 @$(if $(boards-per-dir), \
1709 $(foreach b, $(boards-per-dir 1516 $(foreach b, $(boards-per-dir), \
1710 printf " %-24s - Build for % 1517 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1711 echo '') 1518 echo '')
1712 1519
1713 1520
1714 # Documentation targets 1521 # Documentation targets
1715 # ------------------------------------------- 1522 # ---------------------------------------------------------------------------
1716 DOC_TARGETS := xmldocs latexdocs pdfdocs html 1523 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1717 linkcheckdocs dochelp refcheck !! 1524 linkcheckdocs dochelp refcheckdocs
1718 PHONY += $(DOC_TARGETS) 1525 PHONY += $(DOC_TARGETS)
1719 $(DOC_TARGETS): !! 1526 $(DOC_TARGETS): scripts_basic FORCE
1720 $(Q)$(MAKE) $(build)=Documentation $@ 1527 $(Q)$(MAKE) $(build)=Documentation $@
1721 1528
1722 <<
1723 # Rust targets <<
1724 # ------------------------------------------- <<
1725 <<
1726 # "Is Rust available?" target <<
1727 PHONY += rustavailable <<
1728 rustavailable: <<
1729 +$(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 <<
1764 # ------------------------------------------- <<
1765 <<
1766 PHONY += misc-check <<
1767 misc-check: <<
1768 $(Q)$(srctree)/scripts/misc-check <<
1769 <<
1770 all: misc-check <<
1771 <<
1772 PHONY += scripts_gdb <<
1773 scripts_gdb: prepare0 <<
1774 $(Q)$(MAKE) $(build)=scripts/gdb <<
1775 $(Q)ln -fsn $(abspath $(srctree)/scri <<
1776 <<
1777 ifdef CONFIG_GDB_SCRIPTS <<
1778 all: scripts_gdb <<
1779 endif <<
1780 <<
1781 else # KBUILD_EXTMOD 1529 else # KBUILD_EXTMOD
1782 1530
1783 filechk_kernel.release = echo $(KERNELRELEASE <<
1784 <<
1785 ### 1531 ###
1786 # External module support. 1532 # External module support.
1787 # When building external modules the kernel u 1533 # When building external modules the kernel used as basis is considered
1788 # read-only, and no consistency checks are ma 1534 # read-only, and no consistency checks are made and the make
1789 # system is not used on the basis kernel. If 1535 # system is not used on the basis kernel. If updates are required
1790 # in the basis kernel ordinary make commands !! 1536 # in the basis kernel ordinary make commands (without M=...) must
>> 1537 # be used.
>> 1538 #
>> 1539 # The following are the only valid targets when building external
>> 1540 # modules.
>> 1541 # make M=dir clean Delete all automatically generated files
>> 1542 # make M=dir modules Make all modules in specified dir
>> 1543 # make M=dir Same as 'make M=dir modules'
>> 1544 # make M=dir modules_install
>> 1545 # Install the modules built in the module directory
>> 1546 # Assumes install directory is already created
1791 1547
1792 # We are always building only modules. !! 1548 # We are always building modules
1793 KBUILD_BUILTIN := <<
1794 KBUILD_MODULES := 1 1549 KBUILD_MODULES := 1
1795 1550
1796 build-dir := $(KBUILD_EXTMOD) !! 1551 PHONY += $(objtree)/Module.symvers
>> 1552 $(objtree)/Module.symvers:
>> 1553 @test -e $(objtree)/Module.symvers || ( \
>> 1554 echo; \
>> 1555 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
>> 1556 echo " is missing; modules will have no dependencies and modversions."; \
>> 1557 echo )
>> 1558
>> 1559 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
>> 1560 PHONY += $(module-dirs) modules
>> 1561 $(module-dirs): prepare $(objtree)/Module.symvers
>> 1562 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1797 1563
1798 compile_commands.json: $(extmod_prefix)compil !! 1564 modules: $(module-dirs)
1799 PHONY += compile_commands.json !! 1565 @$(kecho) ' Building modules, stage 2.';
>> 1566 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1800 1567
1801 clean-dirs := $(KBUILD_EXTMOD) !! 1568 PHONY += modules_install
1802 clean: private rm-files := $(KBUILD_EXTMOD)/M !! 1569 modules_install: _emodinst_ _emodinst_post
1803 $(KBUILD_EXTMOD)/compile_commands.jso !! 1570
1804 !! 1571 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1805 PHONY += prepare !! 1572 PHONY += _emodinst_
1806 # now expand this into a simple variable to r !! 1573 _emodinst_:
1807 prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT !! 1574 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1808 prepare: !! 1575 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1809 @if [ "$(CC_VERSION_TEXT)" != "$(CONF !! 1576
1810 echo >&2 "warning: the compil !! 1577 PHONY += _emodinst_post
1811 echo >&2 " The kernel was bu !! 1578 _emodinst_post: _emodinst_
1812 echo >&2 " You are using: !! 1579 $(call cmd,depmod)
1813 fi !! 1580
>> 1581 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
>> 1582
>> 1583 PHONY += $(clean-dirs) clean
>> 1584 $(clean-dirs):
>> 1585 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
>> 1586
>> 1587 clean: rm-dirs := $(MODVERDIR)
>> 1588 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1814 1589
1815 PHONY += help 1590 PHONY += help
1816 help: 1591 help:
1817 @echo ' Building external modules.' 1592 @echo ' Building external modules.'
1818 @echo ' Syntax: make -C path/to/ker 1593 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1819 @echo '' 1594 @echo ''
1820 @echo ' modules - default t 1595 @echo ' modules - default target, build the module(s)'
1821 @echo ' modules_install - install t 1596 @echo ' modules_install - install the module'
1822 @echo ' clean - remove ge 1597 @echo ' clean - remove generated files in module directory only'
1823 @echo ' rust-analyzer - generate <<
1824 @echo '' 1598 @echo ''
1825 1599
1826 ifndef CONFIG_MODULES !! 1600 # Dummies...
1827 modules modules_install: __external_modules_e !! 1601 PHONY += prepare scripts
1828 __external_modules_error: !! 1602 prepare:
1829 @echo >&2 '***' !! 1603 $(cmd_crmodverdir)
1830 @echo >&2 '*** The present kernel dis !! 1604 scripts: ;
1831 @echo >&2 '*** You cannot build or in <<
1832 @echo >&2 '***' <<
1833 @false <<
1834 endif <<
1835 <<
1836 endif # KBUILD_EXTMOD 1605 endif # KBUILD_EXTMOD
1837 1606
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 <<
1891 # ------------------------------------------- <<
1892 # To build individual files in subdirectories <<
1893 # <<
1894 # make foo/bar/baz.s <<
1895 # <<
1896 # The supported suffixes for single-target ar <<
1897 # <<
1898 # To build only under specific subdirectories <<
1899 # <<
1900 # make foo/bar/baz/ <<
1901 <<
1902 ifdef single-build <<
1903 <<
1904 # .ko is special because modpost is needed <<
1905 single-ko := $(sort $(filter %.ko, $(MAKECMDG <<
1906 single-no-ko := $(filter-out $(single-ko), $( <<
1907 $(foreach x, o mod, $(patsubs <<
1908 <<
1909 $(single-ko): single_modules <<
1910 @: <<
1911 $(single-no-ko): $(build-dir) <<
1912 @: <<
1913 <<
1914 # Remove MODORDER when done because it is not <<
1915 PHONY += single_modules <<
1916 single_modules: $(single-no-ko) modules_prepa <<
1917 $(Q){ $(foreach m, $(single-ko), echo <<
1918 $(Q)$(MAKE) -f $(srctree)/scripts/Mak <<
1919 ifneq ($(KBUILD_MODPOST_NOFINAL),1) <<
1920 $(Q)$(MAKE) -f $(srctree)/scripts/Mak <<
1921 endif <<
1922 $(Q)rm -f $(MODORDER) <<
1923 <<
1924 single-goals := $(addprefix $(build-dir)/, $( <<
1925 <<
1926 KBUILD_MODULES := 1 <<
1927 <<
1928 endif <<
1929 <<
1930 # Preset locale variables to speed up the bui <<
1931 # tweaks to this spot to avoid wrong language <<
1932 # make menuconfig etc. <<
1933 # Error messages still appears in the origina <<
1934 PHONY += $(build-dir) <<
1935 $(build-dir): prepare <<
1936 $(Q)$(MAKE) $(build)=$@ need-builtin= <<
1937 <<
1938 clean-dirs := $(addprefix _clean_, $(clean-di <<
1939 PHONY += $(clean-dirs) clean <<
1940 $(clean-dirs): <<
1941 $(Q)$(MAKE) $(clean)=$(patsubst _clea <<
1942 <<
1943 clean: $(clean-dirs) 1607 clean: $(clean-dirs)
>> 1608 $(call cmd,rmdirs)
1944 $(call cmd,rmfiles) 1609 $(call cmd,rmfiles)
1945 @find $(or $(KBUILD_EXTMOD), .) $(RCS !! 1610 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1946 \( -name '*.[aios]' -o -name !! 1611 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1947 -o -name '*.ko.*' \ !! 1612 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1948 -o -name '*.dtb' -o -name '*. <<
1949 -o -name '*.dtb.S' -o -name ' <<
1950 -o -name '*.dt.yaml' -o -name <<
1951 -o -name '*.dwo' -o -name '*. 1613 -o -name '*.dwo' -o -name '*.lst' \
1952 -o -name '*.su' -o -name '*.m !! 1614 -o -name '*.su' \
1953 -o -name '.*.d' -o -name '.*. 1615 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1954 -o -name '*.lex.c' -o -name ' 1616 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1955 -o -name '*.asn1.[ch]' \ 1617 -o -name '*.asn1.[ch]' \
1956 -o -name '*.symtypes' -o -nam 1618 -o -name '*.symtypes' -o -name 'modules.order' \
>> 1619 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1957 -o -name '*.c.[012]*.*' \ 1620 -o -name '*.c.[012]*.*' \
1958 -o -name '*.ll' \ 1621 -o -name '*.ll' \
1959 -o -name '*.gcno' \ !! 1622 -o -name '*.gcno' \) -type f -print | xargs rm -f
1960 \) -type f -print \ <<
1961 -o -name '.tmp_*' -print \ <<
1962 | xargs rm -rf <<
1963 1623
1964 # Generate tags for editors 1624 # Generate tags for editors
1965 # ------------------------------------------- 1625 # ---------------------------------------------------------------------------
1966 quiet_cmd_tags = GEN $@ 1626 quiet_cmd_tags = GEN $@
1967 cmd_tags = $(BASH) $(srctree)/scripts/t !! 1627 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1968 1628
1969 tags TAGS cscope gtags: FORCE 1629 tags TAGS cscope gtags: FORCE
1970 $(call cmd,tags) 1630 $(call cmd,tags)
1971 1631
1972 # Generate rust-project.json (a file that des <<
1973 # Rust projects) for rust-analyzer (an implem <<
1974 # Protocol). <<
1975 PHONY += rust-analyzer <<
1976 rust-analyzer: <<
1977 +$(Q)$(CONFIG_SHELL) $(srctree)/scrip <<
1978 $(Q)$(MAKE) $(build)=rust $@ <<
1979 <<
1980 # Script to generate missing namespace depend <<
1981 # ------------------------------------------- <<
1982 <<
1983 PHONY += nsdeps <<
1984 nsdeps: export KBUILD_NSDEPS=1 <<
1985 nsdeps: modules <<
1986 $(Q)$(CONFIG_SHELL) $(srctree)/script <<
1987 <<
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 1632 # Scripts to check various things for consistency
2016 # ------------------------------------------- 1633 # ---------------------------------------------------------------------------
2017 1634
2018 PHONY += includecheck versioncheck coccicheck !! 1635 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
2019 1636
2020 includecheck: 1637 includecheck:
2021 find $(srctree)/* $(RCS_FIND_IGNORE) 1638 find $(srctree)/* $(RCS_FIND_IGNORE) \
2022 -name '*.[hcS]' -type f -prin 1639 -name '*.[hcS]' -type f -print | sort \
2023 | xargs $(PERL) -w $(srctree) 1640 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
2024 1641
2025 versioncheck: 1642 versioncheck:
2026 find $(srctree)/* $(RCS_FIND_IGNORE) 1643 find $(srctree)/* $(RCS_FIND_IGNORE) \
2027 -name '*.[hcS]' -type f -prin 1644 -name '*.[hcS]' -type f -print | sort \
2028 | xargs $(PERL) -w $(srctree) 1645 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
2029 1646
2030 coccicheck: 1647 coccicheck:
2031 $(Q)$(BASH) $(srctree)/scripts/$@ !! 1648 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
>> 1649
>> 1650 namespacecheck:
>> 1651 $(PERL) $(srctree)/scripts/namespace.pl
2032 1652
2033 export_report: 1653 export_report:
2034 $(PERL) $(srctree)/scripts/export_rep 1654 $(PERL) $(srctree)/scripts/export_report.pl
2035 1655
2036 PHONY += checkstack kernelrelease kernelversi 1656 PHONY += checkstack kernelrelease kernelversion image_name
2037 1657
2038 # UML needs a little special treatment here. 1658 # UML needs a little special treatment here. It wants to use the host
2039 # toolchain, so needs $(SUBARCH) passed to ch 1659 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
2040 # else wants $(ARCH), including people doing 1660 # else wants $(ARCH), including people doing cross-builds, which means
2041 # that $(SUBARCH) doesn't work here. 1661 # that $(SUBARCH) doesn't work here.
2042 ifeq ($(ARCH), um) 1662 ifeq ($(ARCH), um)
2043 CHECKSTACK_ARCH := $(SUBARCH) 1663 CHECKSTACK_ARCH := $(SUBARCH)
2044 else 1664 else
2045 CHECKSTACK_ARCH := $(ARCH) 1665 CHECKSTACK_ARCH := $(ARCH)
2046 endif 1666 endif
2047 MINSTACKSIZE ?= 100 <<
2048 checkstack: 1667 checkstack:
2049 $(OBJDUMP) -d vmlinux $$(find . -name 1668 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
2050 $(PERL) $(srctree)/scripts/checkstack !! 1669 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
2051 1670
2052 kernelrelease: 1671 kernelrelease:
2053 @$(filechk_kernel.release) !! 1672 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
2054 1673
2055 kernelversion: 1674 kernelversion:
2056 @echo $(KERNELVERSION) 1675 @echo $(KERNELVERSION)
2057 1676
2058 image_name: 1677 image_name:
2059 @echo $(KBUILD_IMAGE) 1678 @echo $(KBUILD_IMAGE)
2060 1679
2061 PHONY += run-command !! 1680 # Clear a bunch of variables before executing the submake
2062 run-command: !! 1681 tools/: FORCE
2063 $(Q)$(KBUILD_RUN_COMMAND) !! 1682 $(Q)mkdir -p $(objtree)/tools
>> 1683 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
>> 1684
>> 1685 tools/%: FORCE
>> 1686 $(Q)mkdir -p $(objtree)/tools
>> 1687 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
>> 1688
>> 1689 # Single targets
>> 1690 # ---------------------------------------------------------------------------
>> 1691 # Single targets are compatible with:
>> 1692 # - build with mixed source and output
>> 1693 # - build with separate output dir 'make O=...'
>> 1694 # - external modules
>> 1695 #
>> 1696 # target-dir => where to store outputfile
>> 1697 # build-dir => directory in kernel source tree to use
>> 1698
>> 1699 ifeq ($(KBUILD_EXTMOD),)
>> 1700 build-dir = $(patsubst %/,%,$(dir $@))
>> 1701 target-dir = $(dir $@)
>> 1702 else
>> 1703 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
>> 1704 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
>> 1705 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
>> 1706 endif
>> 1707
>> 1708 %.s: %.c prepare scripts FORCE
>> 1709 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
>> 1710 %.i: %.c prepare scripts FORCE
>> 1711 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
>> 1712 %.o: %.c prepare scripts FORCE
>> 1713 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
>> 1714 %.lst: %.c prepare scripts FORCE
>> 1715 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
>> 1716 %.s: %.S prepare scripts FORCE
>> 1717 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
>> 1718 %.o: %.S prepare scripts FORCE
>> 1719 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
>> 1720 %.symtypes: %.c prepare scripts FORCE
>> 1721 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
>> 1722 %.ll: %.c prepare scripts FORCE
>> 1723 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
>> 1724
>> 1725 # Modules
>> 1726 /: prepare scripts FORCE
>> 1727 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
>> 1728 $(build)=$(build-dir)
>> 1729 # Make sure the latest headers are built for Documentation
>> 1730 Documentation/ samples/: headers_install
>> 1731 %/: prepare scripts FORCE
>> 1732 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
>> 1733 $(build)=$(build-dir)
>> 1734 %.ko: prepare scripts FORCE
>> 1735 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
>> 1736 $(build)=$(build-dir) $(@:.ko=.o)
>> 1737 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
>> 1738
>> 1739 # FIXME Should go into a make.lib or something
>> 1740 # ===========================================================================
>> 1741
>> 1742 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
>> 1743 cmd_rmdirs = rm -rf $(rm-dirs)
2064 1744
2065 quiet_cmd_rmfiles = $(if $(wildcard $(rm-file 1745 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
2066 cmd_rmfiles = rm -rf $(rm-files) !! 1746 cmd_rmfiles = rm -f $(rm-files)
>> 1747
>> 1748 # Run depmod only if we have System.map and depmod is executable
>> 1749 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
>> 1750 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
>> 1751 $(KERNELRELEASE)
>> 1752
>> 1753 # Create temporary dir for module support files
>> 1754 # clean it up only when building all modules
>> 1755 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
>> 1756 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
2067 1757
2068 # read saved command lines for existing targe 1758 # read saved command lines for existing targets
2069 existing-targets := $(wildcard $(sort $(targe 1759 existing-targets := $(wildcard $(sort $(targets)))
2070 1760
2071 -include $(foreach f,$(existing-targets),$(di !! 1761 cmd_files := $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
2072 !! 1762 $(cmd_files): ; # Do not try to update included dependency files
2073 endif # config-build !! 1763 -include $(cmd_files)
2074 endif # mixed-build !! 1764
2075 endif # need-sub-make !! 1765 endif # ifeq ($(config-targets),1)
>> 1766 endif # ifeq ($(mixed-targets),1)
>> 1767 endif # skip-makefile
2076 1768
2077 PHONY += FORCE 1769 PHONY += FORCE
2078 FORCE: 1770 FORCE:
2079 1771
2080 # Declare the contents of the PHONY variable 1772 # Declare the contents of the PHONY variable as phony. We keep that
2081 # information in a variable so we can use it 1773 # information in a variable so we can use it in if_changed and friends.
2082 .PHONY: $(PHONY) 1774 .PHONY: $(PHONY)
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