Commit | Line | Data |
---|---|---|
b2441318 | 1 | # SPDX-License-Identifier: GPL-2.0 |
bfeffd15 | 2 | VERSION = 5 |
31231092 | 3 | PATCHLEVEL = 18 |
55922c9d | 4 | SUBLEVEL = 0 |
4b0986a3 | 5 | EXTRAVERSION = |
754e0b0e | 6 | NAME = Superb Owl |
1da177e4 LT |
7 | |
8 | # *DOCUMENTATION* | |
9 | # To see a list of typical targets execute "make help" | |
10 | # More info can be located in ./README | |
11 | # Comments in this file are targeted only to the developer, do not | |
12 | # expect to learn how to build the kernel reading this file. | |
13 | ||
121c2a13 MY |
14 | $(if $(filter __%, $(MAKECMDGOALS)), \ |
15 | $(error targets prefixed with '__' are only for internal use)) | |
16 | ||
ba634ece | 17 | # That's our default target when none is given on the command line |
121c2a13 MY |
18 | PHONY := __all |
19 | __all: | |
ba634ece | 20 | |
1da177e4 LT |
21 | # We are using a recursive build, so we need to do a little thinking |
22 | # to get the ordering right. | |
23 | # | |
24 | # Most importantly: sub-Makefiles should only ever modify files in | |
25 | # their own directory. If in some directory we have a dependency on | |
26 | # a file in another dir (which doesn't happen often, but it's often | |
f49821ee | 27 | # unavoidable when linking the built-in.a targets which finally |
1da177e4 LT |
28 | # turn into vmlinux), we will call a sub make in that other dir, and |
29 | # after that we are sure that everything which is in that other dir | |
30 | # is now up to date. | |
31 | # | |
32 | # The only cases where we need to modify files which have global | |
33 | # effects are thus separated out and done before the recursive | |
34 | # descending is started. They are now explicitly listed as the | |
35 | # prepare rule. | |
36 | ||
221cc2d2 | 37 | ifneq ($(sub_make_done),1) |
3812b8c5 MY |
38 | |
39 | # Do not use make's built-in rules and variables | |
40 | # (this increases performance and avoids hard-to-debug behaviour) | |
41 | MAKEFLAGS += -rR | |
42 | ||
43 | # Avoid funny character set dependencies | |
44 | unexport LC_ALL | |
45 | LC_COLLATE=C | |
46 | LC_NUMERIC=C | |
47 | export LC_COLLATE LC_NUMERIC | |
48 | ||
49 | # Avoid interference with shell env settings | |
50 | unexport GREP_OPTIONS | |
51 | ||
066b7ed9 MM |
52 | # Beautify output |
53 | # --------------------------------------------------------------------------- | |
54 | # | |
55 | # Normally, we echo the whole command before executing it. By making | |
56 | # that echo $($(quiet)$(cmd)), we now have the possibility to set | |
57 | # $(quiet) to choose other forms of output instead, e.g. | |
58 | # | |
59 | # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ | |
60 | # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< | |
61 | # | |
62 | # If $(quiet) is empty, the whole command will be printed. | |
63 | # If it is set to "quiet_", only the short version will be printed. | |
64 | # If it is set to "silent_", nothing will be printed at all, since | |
65 | # the variable $(silent_cmd_cc_o_c) doesn't exist. | |
66 | # | |
67 | # A simple variant is to prefix commands with $(Q) - that's useful | |
68 | # for commands that shall be hidden in non-verbose mode. | |
69 | # | |
70 | # $(Q)ln $@ :< | |
71 | # | |
72 | # If KBUILD_VERBOSE equals 0 then the above command will be hidden. | |
73 | # If KBUILD_VERBOSE equals 1 then the above command is displayed. | |
505b12b3 | 74 | # If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt. |
066b7ed9 | 75 | # |
1da177e4 LT |
76 | # To put more focus on warnings, be less verbose as default |
77 | # Use 'make V=1' to see the full commands | |
78 | ||
b8b0618c CR |
79 | ifeq ("$(origin V)", "command line") |
80 | KBUILD_VERBOSE = $(V) | |
1da177e4 LT |
81 | endif |
82 | ifndef KBUILD_VERBOSE | |
83 | KBUILD_VERBOSE = 0 | |
84 | endif | |
85 | ||
066b7ed9 MM |
86 | ifeq ($(KBUILD_VERBOSE),1) |
87 | quiet = | |
88 | Q = | |
89 | else | |
90 | quiet=quiet_ | |
91 | Q = @ | |
92 | endif | |
93 | ||
94 | # If the user is running make -s (silent mode), suppress echoing of | |
95 | # commands | |
96 | ||
6f0fa58e | 97 | ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) |
066b7ed9 | 98 | quiet=silent_ |
22149454 | 99 | KBUILD_VERBOSE = 0 |
066b7ed9 | 100 | endif |
066b7ed9 MM |
101 | |
102 | export quiet Q KBUILD_VERBOSE | |
103 | ||
bcf637f5 MY |
104 | # Call a source code checker (by default, "sparse") as part of the |
105 | # C compilation. | |
106 | # | |
107 | # Use 'make C=1' to enable checking of only re-compiled files. | |
108 | # Use 'make C=2' to enable checking of *all* source files, regardless | |
109 | # of whether they are re-compiled or not. | |
110 | # | |
111 | # See the file "Documentation/dev-tools/sparse.rst" for more details, | |
112 | # including where to get the "sparse" utility. | |
113 | ||
114 | ifeq ("$(origin C)", "command line") | |
115 | KBUILD_CHECKSRC = $(C) | |
116 | endif | |
117 | ifndef KBUILD_CHECKSRC | |
118 | KBUILD_CHECKSRC = 0 | |
119 | endif | |
120 | ||
121 | export KBUILD_CHECKSRC | |
122 | ||
123 | # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the | |
124 | # directory of external module to build. Setting M= takes precedence. | |
125 | ifeq ("$(origin M)", "command line") | |
126 | KBUILD_EXTMOD := $(M) | |
127 | endif | |
128 | ||
129 | $(if $(word 2, $(KBUILD_EXTMOD)), \ | |
130 | $(error building multiple external modules is not supported)) | |
131 | ||
74ee585b MY |
132 | # Remove trailing slashes |
133 | ifneq ($(filter %/, $(KBUILD_EXTMOD)),) | |
134 | KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) | |
135 | endif | |
136 | ||
bcf637f5 MY |
137 | export KBUILD_EXTMOD |
138 | ||
25b146c5 MY |
139 | # Kbuild will save output files in the current working directory. |
140 | # This does not need to match to the root of the kernel source tree. | |
141 | # | |
142 | # For example, you can do this: | |
143 | # | |
144 | # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile | |
145 | # | |
146 | # If you want to save output files in a different location, there are | |
147 | # two syntaxes to specify it. | |
148 | # | |
1da177e4 LT |
149 | # 1) O= |
150 | # Use "make O=dir/to/store/output/files/" | |
070b98bf | 151 | # |
1da177e4 | 152 | # 2) Set KBUILD_OUTPUT |
25b146c5 MY |
153 | # Set the environment variable KBUILD_OUTPUT to point to the output directory. |
154 | # export KBUILD_OUTPUT=dir/to/store/output/files/; make | |
1da177e4 LT |
155 | # |
156 | # The O= assignment takes precedence over the KBUILD_OUTPUT environment | |
157 | # variable. | |
158 | ||
25b146c5 | 159 | # Do we want to change the working directory? |
b8b0618c CR |
160 | ifeq ("$(origin O)", "command line") |
161 | KBUILD_OUTPUT := $(O) | |
1da177e4 LT |
162 | endif |
163 | ||
25b146c5 MY |
164 | ifneq ($(KBUILD_OUTPUT),) |
165 | # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot | |
166 | # expand a shell special character '~'. We use a somewhat tedious way here. | |
167 | abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) | |
168 | $(if $(abs_objtree),, \ | |
169 | $(error failed to create output directory "$(KBUILD_OUTPUT)")) | |
170 | ||
171 | # $(realpath ...) resolves symlinks | |
172 | abs_objtree := $(realpath $(abs_objtree)) | |
173 | else | |
174 | abs_objtree := $(CURDIR) | |
175 | endif # ifneq ($(KBUILD_OUTPUT),) | |
176 | ||
177 | ifeq ($(abs_objtree),$(CURDIR)) | |
178 | # Suppress "Entering directory ..." unless we are changing the work directory. | |
179 | MAKEFLAGS += --no-print-directory | |
180 | else | |
181 | need-sub-make := 1 | |
51193b76 RJ |
182 | endif |
183 | ||
30cef68d MY |
184 | this-makefile := $(lastword $(MAKEFILE_LIST)) |
185 | abs_srctree := $(realpath $(dir $(this-makefile))) | |
1da177e4 | 186 | |
25b146c5 MY |
187 | ifneq ($(words $(subst :, ,$(abs_srctree))), 1) |
188 | $(error source directory cannot contain spaces or colons) | |
189 | endif | |
1da177e4 | 190 | |
25b146c5 | 191 | ifneq ($(abs_srctree),$(abs_objtree)) |
80463f1b MY |
192 | # Look for make include files relative to root of kernel src |
193 | # | |
d8285639 MY |
194 | # --included-dir is added for backward compatibility, but you should not rely on |
195 | # it. Please add $(srctree)/ prefix to include Makefiles in the source tree. | |
25b146c5 | 196 | MAKEFLAGS += --include-dir=$(abs_srctree) |
25b146c5 | 197 | endif |
3812b8c5 | 198 | |
688931a5 MY |
199 | ifneq ($(filter 3.%,$(MAKE_VERSION)),) |
200 | # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x | |
201 | # We need to invoke sub-make to avoid implicit rules in the top Makefile. | |
202 | need-sub-make := 1 | |
203 | # Cancel implicit rules for this Makefile. | |
93fdddfe | 204 | $(this-makefile): ; |
688931a5 MY |
205 | endif |
206 | ||
25b146c5 | 207 | export abs_srctree abs_objtree |
221cc2d2 MY |
208 | export sub_make_done := 1 |
209 | ||
688931a5 MY |
210 | ifeq ($(need-sub-make),1) |
211 | ||
121c2a13 | 212 | PHONY += $(MAKECMDGOALS) __sub-make |
0b35786d | 213 | |
121c2a13 | 214 | $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make |
16f89098 | 215 | @: |
0b35786d | 216 | |
c4e6fff1 | 217 | # Invoke a second make in the output directory, passing relevant variables |
121c2a13 | 218 | __sub-make: |
25b146c5 | 219 | $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) |
1da177e4 | 220 | |
688931a5 | 221 | endif # need-sub-make |
221cc2d2 | 222 | endif # sub_make_done |
688931a5 | 223 | |
1da177e4 | 224 | # We process the rest of the Makefile if this is the final invocation of make |
688931a5 | 225 | ifeq ($(need-sub-make),) |
1da177e4 | 226 | |
7ff52571 MY |
227 | # Do not print "Entering directory ...", |
228 | # but we want to display it when entering to the output directory | |
229 | # so that IDEs/editors are able to understand relative filenames. | |
230 | MAKEFLAGS += --no-print-directory | |
231 | ||
25b146c5 | 232 | ifeq ($(abs_srctree),$(abs_objtree)) |
9da0763b MM |
233 | # building in the source tree |
234 | srctree := . | |
051f278e | 235 | building_out_of_srctree := |
9da0763b | 236 | else |
25b146c5 | 237 | ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) |
9da0763b MM |
238 | # building in a subdirectory of the source tree |
239 | srctree := .. | |
240 | else | |
25b146c5 | 241 | srctree := $(abs_srctree) |
9da0763b | 242 | endif |
051f278e | 243 | building_out_of_srctree := 1 |
9da0763b | 244 | endif |
2c1f4f12 | 245 | |
95fd3f87 MY |
246 | ifneq ($(KBUILD_ABS_SRCTREE),) |
247 | srctree := $(abs_srctree) | |
248 | endif | |
2c1f4f12 | 249 | |
7e1c0477 | 250 | objtree := . |
6b12de69 | 251 | VPATH := $(srctree) |
1da177e4 | 252 | |
051f278e | 253 | export building_out_of_srctree srctree objtree VPATH |
1da177e4 | 254 | |
2c1f4f12 MY |
255 | # To make sure we do not include .config for any of the *config targets |
256 | # catch them early, and hand them over to scripts/kconfig/Makefile | |
257 | # It is allowed to specify more targets when calling make, including | |
258 | # mixing *config targets and build targets. | |
259 | # For example 'make oldconfig all'. | |
260 | # Detect when mixed targets is specified, and make a second invocation | |
261 | # of make so .config is not included in this case either (for *config). | |
262 | ||
263 | version_h := include/generated/uapi/linux/version.h | |
2c1f4f12 | 264 | |
22340a06 MY |
265 | clean-targets := %clean mrproper cleandocs |
266 | no-dot-config-targets := $(clean-targets) \ | |
2c1f4f12 | 267 | cscope gtags TAGS tags help% %docs check% coccicheck \ |
59b2bd05 | 268 | $(version_h) headers headers_% archheaders archscripts \ |
4623980d DE |
269 | %asm-generic kernelversion %src-pkg dt_binding_check \ |
270 | outputmakefile | |
805b2e1d MY |
271 | # Installation targets should not require compiler. Unfortunately, vdso_install |
272 | # is an exception where build artifacts may be updated. This must be fixed. | |
273 | no-compiler-targets := $(no-dot-config-targets) install dtbs_install \ | |
274 | headers_install modules_install kernelrelease image_name | |
993bdde9 MY |
275 | no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \ |
276 | image_name | |
394053f4 | 277 | single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ |
2c1f4f12 | 278 | |
2042b548 MY |
279 | config-build := |
280 | mixed-build := | |
281 | need-config := 1 | |
805b2e1d | 282 | need-compiler := 1 |
2042b548 | 283 | may-sync-config := 1 |
394053f4 | 284 | single-build := |
2c1f4f12 MY |
285 | |
286 | ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) | |
287 | ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) | |
2042b548 | 288 | need-config := |
2c1f4f12 MY |
289 | endif |
290 | endif | |
291 | ||
805b2e1d MY |
292 | ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),) |
293 | ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),) | |
294 | need-compiler := | |
295 | endif | |
296 | endif | |
297 | ||
d7942413 MY |
298 | ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) |
299 | ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) | |
2042b548 | 300 | may-sync-config := |
d7942413 MY |
301 | endif |
302 | endif | |
303 | ||
304 | ifneq ($(KBUILD_EXTMOD),) | |
2042b548 | 305 | may-sync-config := |
d7942413 MY |
306 | endif |
307 | ||
2c1f4f12 | 308 | ifeq ($(KBUILD_EXTMOD),) |
efbf9726 | 309 | ifneq ($(filter %config,$(MAKECMDGOALS)),) |
2042b548 | 310 | config-build := 1 |
2c1f4f12 | 311 | ifneq ($(words $(MAKECMDGOALS)),1) |
2042b548 | 312 | mixed-build := 1 |
2c1f4f12 MY |
313 | endif |
314 | endif | |
315 | endif | |
22340a06 | 316 | |
394053f4 MY |
317 | # We cannot build single targets and the others at the same time |
318 | ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) | |
319 | single-build := 1 | |
320 | ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) | |
321 | mixed-build := 1 | |
322 | endif | |
323 | endif | |
324 | ||
22340a06 MY |
325 | # For "make -j clean all", "make -j mrproper defconfig all", etc. |
326 | ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) | |
327 | ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) | |
2042b548 | 328 | mixed-build := 1 |
22340a06 MY |
329 | endif |
330 | endif | |
331 | ||
2c1f4f12 MY |
332 | # install and modules_install need also be processed one by one |
333 | ifneq ($(filter install,$(MAKECMDGOALS)),) | |
334 | ifneq ($(filter modules_install,$(MAKECMDGOALS)),) | |
2042b548 | 335 | mixed-build := 1 |
2c1f4f12 MY |
336 | endif |
337 | endif | |
338 | ||
2042b548 | 339 | ifdef mixed-build |
2c1f4f12 MY |
340 | # =========================================================================== |
341 | # We're called with mixed targets (*config and build targets). | |
342 | # Handle them one by one. | |
343 | ||
344 | PHONY += $(MAKECMDGOALS) __build_one_by_one | |
345 | ||
121c2a13 | 346 | $(MAKECMDGOALS): __build_one_by_one |
2c1f4f12 MY |
347 | @: |
348 | ||
349 | __build_one_by_one: | |
350 | $(Q)set -e; \ | |
351 | for i in $(MAKECMDGOALS); do \ | |
352 | $(MAKE) -f $(srctree)/Makefile $$i; \ | |
353 | done | |
354 | ||
2042b548 | 355 | else # !mixed-build |
2c1f4f12 | 356 | |
3204a7fb | 357 | include $(srctree)/scripts/Kbuild.include |
2c1f4f12 MY |
358 | |
359 | # Read KERNELRELEASE from include/config/kernel.release (if it exists) | |
360 | KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) | |
361 | KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) | |
362 | export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION | |
363 | ||
3204a7fb | 364 | include $(srctree)/scripts/subarch.include |
1da177e4 LT |
365 | |
366 | # Cross compiling and selecting different set of gcc/bin-utils | |
367 | # --------------------------------------------------------------------------- | |
368 | # | |
369 | # When performing cross compilation for other architectures ARCH shall be set | |
370 | # to the target architecture. (See arch/* for the possibilities). | |
371 | # ARCH can be set during invocation of make: | |
372 | # make ARCH=ia64 | |
373 | # Another way is to have ARCH set in the environment. | |
374 | # The default ARCH is the host where make is executed. | |
375 | ||
376 | # CROSS_COMPILE specify the prefix used for all executables used | |
377 | # during compilation. Only gcc and related bin-utils executables | |
378 | # are prefixed with $(CROSS_COMPILE). | |
379 | # CROSS_COMPILE can be set on the command line | |
380 | # make CROSS_COMPILE=ia64-linux- | |
381 | # Alternatively CROSS_COMPILE can be set in the environment. | |
382 | # Default value for CROSS_COMPILE is not to prefix executables | |
383 | # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile | |
2331d1a6 | 384 | ARCH ?= $(SUBARCH) |
1da177e4 LT |
385 | |
386 | # Architecture as present in compile.h | |
6752ed90 TG |
387 | UTS_MACHINE := $(ARCH) |
388 | SRCARCH := $(ARCH) | |
1da177e4 | 389 | |
d746d647 SR |
390 | # Additional ARCH settings for x86 |
391 | ifeq ($(ARCH),i386) | |
392 | SRCARCH := x86 | |
393 | endif | |
394 | ifeq ($(ARCH),x86_64) | |
395 | SRCARCH := x86 | |
396 | endif | |
74b469f2 | 397 | |
5e538790 | 398 | # Additional ARCH settings for sparc |
e69f58c0 NK |
399 | ifeq ($(ARCH),sparc32) |
400 | SRCARCH := sparc | |
401 | endif | |
a439fe51 | 402 | ifeq ($(ARCH),sparc64) |
5e538790 | 403 | SRCARCH := sparc |
a439fe51 | 404 | endif |
2fb9b1bd | 405 | |
5f6e0fe0 MY |
406 | # Additional ARCH settings for parisc |
407 | ifeq ($(ARCH),parisc64) | |
408 | SRCARCH := parisc | |
409 | endif | |
410 | ||
f02aa48d MY |
411 | export cross_compiling := |
412 | ifneq ($(SRCARCH),$(SUBARCH)) | |
413 | cross_compiling := 1 | |
414 | endif | |
415 | ||
14cdd3c4 | 416 | KCONFIG_CONFIG ?= .config |
41263fc6 | 417 | export KCONFIG_CONFIG |
14cdd3c4 | 418 | |
1da177e4 | 419 | # SHELL used by kbuild |
858805b3 | 420 | CONFIG_SHELL := sh |
1da177e4 | 421 | |
6d79a7b4 MY |
422 | HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) |
423 | HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) | |
424 | HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) | |
d7f14c66 | 425 | |
a0d1c951 | 426 | ifneq ($(LLVM),) |
e9c28192 NC |
427 | ifneq ($(filter %/,$(LLVM)),) |
428 | LLVM_PREFIX := $(LLVM) | |
429 | else ifneq ($(filter -%,$(LLVM)),) | |
430 | LLVM_SUFFIX := $(LLVM) | |
431 | endif | |
432 | ||
433 | HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) | |
434 | HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) | |
a0d1c951 MY |
435 | else |
436 | HOSTCC = gcc | |
437 | HOSTCXX = g++ | |
438 | endif | |
7f3a59db | 439 | |
f67695c9 | 440 | KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ |
b8321ed4 LT |
441 | -O2 -fomit-frame-pointer -std=gnu11 \ |
442 | -Wdeclaration-after-statement | |
f67695c9 EB |
443 | KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) |
444 | KBUILD_USERLDFLAGS := $(USERLDFLAGS) | |
7f3a59db | 445 | |
f67695c9 | 446 | KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) |
735aab1e | 447 | KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) |
f92d19e0 LA |
448 | KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) |
449 | KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) | |
1da177e4 | 450 | |
1da177e4 | 451 | # Make variables (CC, etc...) |
1da177e4 | 452 | CPP = $(CC) -E |
a0d1c951 | 453 | ifneq ($(LLVM),) |
e9c28192 NC |
454 | CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) |
455 | LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) | |
456 | AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) | |
457 | NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) | |
458 | OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) | |
459 | OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) | |
460 | READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) | |
461 | STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) | |
a0d1c951 MY |
462 | else |
463 | CC = $(CROSS_COMPILE)gcc | |
464 | LD = $(CROSS_COMPILE)ld | |
1da177e4 LT |
465 | AR = $(CROSS_COMPILE)ar |
466 | NM = $(CROSS_COMPILE)nm | |
1da177e4 LT |
467 | OBJCOPY = $(CROSS_COMPILE)objcopy |
468 | OBJDUMP = $(CROSS_COMPILE)objdump | |
eefb8c12 | 469 | READELF = $(CROSS_COMPILE)readelf |
a0d1c951 MY |
470 | STRIP = $(CROSS_COMPILE)strip |
471 | endif | |
e83b9f55 | 472 | PAHOLE = pahole |
c9a0f3b8 | 473 | RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids |
73a4f6db MY |
474 | LEX = flex |
475 | YACC = bison | |
1da177e4 | 476 | AWK = awk |
caa27b66 | 477 | INSTALLKERNEL := installkernel |
436e980e | 478 | DEPMOD = depmod |
1da177e4 | 479 | PERL = perl |
e9781b52 | 480 | PYTHON3 = python3 |
1da177e4 | 481 | CHECK = sparse |
858805b3 | 482 | BASH = bash |
e4a42c82 DE |
483 | KGZIP = gzip |
484 | KBZIP2 = bzip2 | |
485 | KLZOP = lzop | |
8dfb61dc DE |
486 | LZMA = lzma |
487 | LZ4 = lz4c | |
488 | XZ = xz | |
48f7ddf7 | 489 | ZSTD = zstd |
8dfb61dc | 490 | |
9741e07e JO |
491 | PAHOLE_FLAGS = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh) |
492 | ||
80a7d1d9 | 493 | CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ |
6c49f359 | 494 | -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) |
0c22be07 | 495 | NOSTDINC_FLAGS := |
6588169d SR |
496 | CFLAGS_MODULE = |
497 | AFLAGS_MODULE = | |
498 | LDFLAGS_MODULE = | |
1da177e4 LT |
499 | CFLAGS_KERNEL = |
500 | AFLAGS_KERNEL = | |
b36fad65 | 501 | LDFLAGS_vmlinux = |
1da177e4 | 502 | |
abbf1590 DH |
503 | # Use USERINCLUDE when you must reference the UAPI directories only. |
504 | USERINCLUDE := \ | |
9d022c54 MY |
505 | -I$(srctree)/arch/$(SRCARCH)/include/uapi \ |
506 | -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ | |
abbf1590 | 507 | -I$(srctree)/include/uapi \ |
3308b285 | 508 | -I$(objtree)/include/generated/uapi \ |
ce6ed1c4 | 509 | -include $(srctree)/include/linux/compiler-version.h \ |
abbf1590 DH |
510 | -include $(srctree)/include/linux/kconfig.h |
511 | ||
1da177e4 LT |
512 | # Use LINUXINCLUDE when you must reference the include/ directory. |
513 | # Needed to be compatible with the O= option | |
abbf1590 | 514 | LINUXINCLUDE := \ |
9d022c54 MY |
515 | -I$(srctree)/arch/$(SRCARCH)/include \ |
516 | -I$(objtree)/arch/$(SRCARCH)/include/generated \ | |
051f278e | 517 | $(if $(building_out_of_srctree),-I$(srctree)/include) \ |
f8224f7f MY |
518 | -I$(objtree)/include \ |
519 | $(USERINCLUDE) | |
1da177e4 | 520 | |
42a92bcc | 521 | KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE |
eeb5687a | 522 | KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ |
42a92bcc | 523 | -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ |
b89f25ea | 524 | -Werror=implicit-function-declaration -Werror=implicit-int \ |
172aad81 | 525 | -Werror=return-type -Wno-format-security \ |
e8c07082 | 526 | -std=gnu11 |
433dc2eb | 527 | KBUILD_CPPFLAGS := -D__KERNEL__ |
80c00ba9 SR |
528 | KBUILD_AFLAGS_KERNEL := |
529 | KBUILD_CFLAGS_KERNEL := | |
6588169d SR |
530 | KBUILD_AFLAGS_MODULE := -DMODULE |
531 | KBUILD_CFLAGS_MODULE := -DMODULE | |
10df0638 | 532 | KBUILD_LDFLAGS_MODULE := |
d503ac53 | 533 | KBUILD_LDFLAGS := |
5241ab4c | 534 | CLANG_FLAGS := |
1da177e4 | 535 | |
aa824e0c | 536 | export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC |
d9b5665f | 537 | export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL |
d8d2d382 | 538 | export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX |
48f7ddf7 | 539 | export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD |
7bac9870 | 540 | export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE |
f67695c9 | 541 | export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS |
1da177e4 | 542 | |
d503ac53 | 543 | export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS |
0e410e15 | 544 | export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE |
222d394d | 545 | export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE |
6588169d | 546 | export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE |
80c00ba9 | 547 | export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL |
9741e07e | 548 | export PAHOLE_FLAGS |
1da177e4 | 549 | |
1da177e4 LT |
550 | # Files to ignore in find ... statements |
551 | ||
ae63b2d7 PB |
552 | export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ |
553 | -name CVS -o -name .pc -o -name .hg -o -name .git \) \ | |
554 | -prune -o | |
450c6076 JJ |
555 | export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ |
556 | --exclude CVS --exclude .pc --exclude .hg --exclude .git | |
1da177e4 LT |
557 | |
558 | # =========================================================================== | |
559 | # Rules shared between *config targets and build targets | |
560 | ||
312a3d09 | 561 | # Basic helpers built in scripts/basic/ |
4f193362 | 562 | PHONY += scripts_basic |
1da177e4 LT |
563 | scripts_basic: |
564 | $(Q)$(MAKE) $(build)=scripts/basic | |
565 | ||
4f193362 | 566 | PHONY += outputmakefile |
2728fcfa | 567 | ifdef building_out_of_srctree |
e8e83a23 | 568 | # Before starting out-of-tree build, make sure the source tree is clean. |
fd5f0cd6 JB |
569 | # outputmakefile generates a Makefile in the output directory, if using a |
570 | # separate output directory. This allows convenient use of make in the | |
571 | # output directory. | |
3a51ff34 VK |
572 | # At the same time when output Makefile generated, generate .gitignore to |
573 | # ignore whole output directory | |
2728fcfa MY |
574 | |
575 | quiet_cmd_makefile = GEN Makefile | |
576 | cmd_makefile = { \ | |
577 | echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ | |
578 | echo "include $(srctree)/Makefile"; \ | |
579 | } > Makefile | |
580 | ||
1da177e4 | 581 | outputmakefile: |
e8e83a23 MY |
582 | $(Q)if [ -f $(srctree)/.config -o \ |
583 | -d $(srctree)/include/config -o \ | |
584 | -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ | |
585 | echo >&2 "***"; \ | |
586 | echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ | |
587 | echo >&2 "*** in $(abs_srctree)";\ | |
588 | echo >&2 "***"; \ | |
589 | false; \ | |
590 | fi | |
92979997 | 591 | $(Q)ln -fsn $(srctree) source |
2728fcfa | 592 | $(call cmd,makefile) |
156e7cbb MY |
593 | $(Q)test -e .gitignore || \ |
594 | { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore | |
fd5f0cd6 | 595 | endif |
1da177e4 | 596 | |
db07562a ND |
597 | # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. |
598 | # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. | |
599 | # CC_VERSION_TEXT is referenced from Kconfig (so it needs export), | |
600 | # and from include/config/auto.conf.cmd to detect the compiler upgrade. | |
6072b2c4 | 601 | CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) |
db07562a ND |
602 | |
603 | ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) | |
6f5b41a2 | 604 | include $(srctree)/scripts/Makefile.clang |
ae6b289a CF |
605 | endif |
606 | ||
57fd251c MY |
607 | # Include this also for config targets because some architectures need |
608 | # cc-cross-prefix to determine CROSS_COMPILE. | |
805b2e1d | 609 | ifdef need-compiler |
57fd251c | 610 | include $(srctree)/scripts/Makefile.compiler |
805b2e1d | 611 | endif |
57fd251c | 612 | |
2042b548 | 613 | ifdef config-build |
1da177e4 LT |
614 | # =========================================================================== |
615 | # *config targets only - make sure prerequisites are updated, and descend | |
616 | # in scripts/kconfig to make the *config target | |
617 | ||
618 | # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. | |
619 | # KBUILD_DEFCONFIG may point out an alternative default configuration | |
620 | # used for 'make defconfig' | |
3204a7fb | 621 | include $(srctree)/arch/$(SRCARCH)/Makefile |
315bab4e | 622 | export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT |
1da177e4 | 623 | |
36de077b | 624 | config: outputmakefile scripts_basic FORCE |
31110ebb SR |
625 | $(Q)$(MAKE) $(build)=scripts/kconfig $@ |
626 | ||
36de077b | 627 | %config: outputmakefile scripts_basic FORCE |
1da177e4 LT |
628 | $(Q)$(MAKE) $(build)=scripts/kconfig $@ |
629 | ||
2042b548 | 630 | else #!config-build |
1da177e4 LT |
631 | # =========================================================================== |
632 | # Build targets only - this includes vmlinux, arch specific targets, clean | |
633 | # targets and others. In general all targets except *config targets. | |
634 | ||
2c1f4f12 | 635 | # If building an external module we do not care about the all: rule |
121c2a13 | 636 | # but instead __all depend on modules |
2c1f4f12 MY |
637 | PHONY += all |
638 | ifeq ($(KBUILD_EXTMOD),) | |
121c2a13 | 639 | __all: all |
2c1f4f12 | 640 | else |
121c2a13 | 641 | __all: modules |
2c1f4f12 MY |
642 | endif |
643 | ||
644 | # Decide whether to build built-in, modular, or both. | |
645 | # Normally, just do built-in. | |
646 | ||
647 | KBUILD_MODULES := | |
648 | KBUILD_BUILTIN := 1 | |
649 | ||
650 | # If we have only "make modules", don't compile built-in objects. | |
2c1f4f12 | 651 | ifeq ($(MAKECMDGOALS),modules) |
4b50c8c4 | 652 | KBUILD_BUILTIN := |
2c1f4f12 MY |
653 | endif |
654 | ||
655 | # If we have "make <whatever> modules", compile modules | |
656 | # in addition to whatever we do anyway. | |
657 | # Just "make" or "make all" shall build modules as well | |
658 | ||
6ad7cbc0 | 659 | ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) |
2c1f4f12 MY |
660 | KBUILD_MODULES := 1 |
661 | endif | |
662 | ||
663 | ifeq ($(MAKECMDGOALS),) | |
664 | KBUILD_MODULES := 1 | |
665 | endif | |
666 | ||
667 | export KBUILD_MODULES KBUILD_BUILTIN | |
668 | ||
2042b548 | 669 | ifdef need-config |
d93a18f2 MY |
670 | include include/config/auto.conf |
671 | endif | |
672 | ||
1da177e4 | 673 | ifeq ($(KBUILD_EXTMOD),) |
1da177e4 | 674 | # Objects we will link into vmlinux / subdirs we need to visit |
d92cc4d5 | 675 | core-y := init/ usr/ arch/$(SRCARCH)/ |
f96182e9 | 676 | drivers-y := drivers/ sound/ |
d93a18f2 | 677 | drivers-$(CONFIG_SAMPLES) += samples/ |
8b5f4eb3 MY |
678 | drivers-$(CONFIG_NET) += net/ |
679 | drivers-y += virt/ | |
1da177e4 | 680 | libs-y := lib/ |
1da177e4 LT |
681 | endif # KBUILD_EXTMOD |
682 | ||
315bab4e MY |
683 | # The all: target is the default when no target is given on the |
684 | # command line. | |
685 | # This allow a user to issue only 'make' to build a kernel including modules | |
686 | # Defaults to vmlinux, but the arch makefile usually adds further targets | |
687 | all: vmlinux | |
688 | ||
7d73c3e9 ND |
689 | CFLAGS_GCOV := -fprofile-arcs -ftest-coverage |
690 | ifdef CONFIG_CC_IS_GCC | |
691 | CFLAGS_GCOV += -fno-tree-loop-im | |
692 | endif | |
5aadfdeb | 693 | export CFLAGS_GCOV |
315bab4e | 694 | |
b1f4ff74 PZ |
695 | # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. |
696 | ifdef CONFIG_FUNCTION_TRACER | |
697 | CC_FLAGS_FTRACE := -pg | |
698 | endif | |
699 | ||
3204a7fb | 700 | include $(srctree)/arch/$(SRCARCH)/Makefile |
1da177e4 | 701 | |
2042b548 MY |
702 | ifdef need-config |
703 | ifdef may-sync-config | |
315bab4e MY |
704 | # Read in dependencies to all Kconfig* files, make sure to run syncconfig if |
705 | # changes are detected. This should be included after arch/$(SRCARCH)/Makefile | |
706 | # because some architectures define CROSS_COMPILE there. | |
d2f8ae0e | 707 | include include/config/auto.conf.cmd |
1da177e4 | 708 | |
05850719 MY |
709 | $(KCONFIG_CONFIG): |
710 | @echo >&2 '***' | |
711 | @echo >&2 '*** Configuration file "$@" not found!' | |
712 | @echo >&2 '***' | |
713 | @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' | |
714 | @echo >&2 '*** "make menuconfig" or "make xconfig").' | |
715 | @echo >&2 '***' | |
716 | @/bin/false | |
1da177e4 | 717 | |
61277981 UM |
718 | # The actual configuration files used during the build are stored in |
719 | # include/generated/ and include/config/. Update them if .config is newer than | |
720 | # include/config/auto.conf (which mirrors .config). | |
9390dff6 MY |
721 | # |
722 | # This exploits the 'multi-target pattern rule' trick. | |
723 | # The syncconfig should be executed only once to make all the targets. | |
f463c351 | 724 | # (Note: use the grouped target '&:' when we bump to GNU Make 4.3) |
d952cfaf MY |
725 | # |
726 | # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, | |
727 | # so you cannot notice that Kconfig is waiting for the user input. | |
3044dd05 | 728 | %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) |
d952cfaf MY |
729 | $(Q)$(kecho) " SYNC $@" |
730 | $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig | |
2042b548 | 731 | else # !may-sync-config |
d7942413 MY |
732 | # External modules and some install targets need include/generated/autoconf.h |
733 | # and include/config/auto.conf but do not care if they are up-to-date. | |
734 | # Use auto.conf to trigger the test | |
9ee4e336 SR |
735 | PHONY += include/config/auto.conf |
736 | ||
737 | include/config/auto.conf: | |
264a2683 | 738 | $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ |
5369f550 MM |
739 | echo >&2; \ |
740 | echo >&2 " ERROR: Kernel configuration is invalid."; \ | |
741 | echo >&2 " include/generated/autoconf.h or $@ are missing.";\ | |
742 | echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ | |
743 | echo >&2 ; \ | |
9ee4e336 SR |
744 | /bin/false) |
745 | ||
d7942413 | 746 | endif # may-sync-config |
2042b548 | 747 | endif # need-config |
1da177e4 | 748 | |
7d73c3e9 | 749 | KBUILD_CFLAGS += -fno-delete-null-pointer-checks |
ef6000b4 | 750 | KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) |
bd664f6b LT |
751 | KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) |
752 | KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) | |
6f303d60 | 753 | KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) |
a1c48bb1 | 754 | |
15f5db60 MY |
755 | ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE |
756 | KBUILD_CFLAGS += -O2 | |
757 | else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 | |
758 | KBUILD_CFLAGS += -O3 | |
759 | else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE | |
760 | KBUILD_CFLAGS += -Os | |
815eb71e | 761 | endif |
1da177e4 | 762 | |
69102311 | 763 | # Tell gcc to never replace conditional load with a non-conditional one |
7d73c3e9 ND |
764 | ifdef CONFIG_CC_IS_GCC |
765 | # gcc-10 renamed --param=allow-store-data-races=0 to | |
766 | # -fno-allow-store-data-races. | |
69102311 | 767 | KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) |
b1112139 | 768 | KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) |
7d73c3e9 | 769 | endif |
69102311 | 770 | |
1873e870 AK |
771 | ifdef CONFIG_READABLE_ASM |
772 | # Disable optimizations that make assembler listings hard to read. | |
773 | # reorder blocks reorders the control in the function | |
774 | # ipa clone creates specialized cloned functions | |
775 | # partial inlining inlines only parts of functions | |
7d73c3e9 | 776 | KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining |
1873e870 AK |
777 | endif |
778 | ||
08f67461 | 779 | ifneq ($(CONFIG_FRAME_WARN),0) |
a83e4ca2 | 780 | KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) |
35bb5b1e AK |
781 | endif |
782 | ||
893ab004 | 783 | stackp-flags-y := -fno-stack-protector |
050e9baa LT |
784 | stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector |
785 | stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong | |
2a61f474 MY |
786 | |
787 | KBUILD_CFLAGS += $(stackp-flags-y) | |
e06b8b98 | 788 | |
3fe617cc | 789 | KBUILD_CFLAGS-$(CONFIG_WERROR) += -Werror |
e92e2634 | 790 | KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH) |
3fe617cc | 791 | |
076f421d | 792 | ifdef CONFIG_CC_IS_CLANG |
a1494304 | 793 | KBUILD_CPPFLAGS += -Qunused-arguments |
e8c07082 | 794 | # The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable. |
a1494304 | 795 | KBUILD_CFLAGS += -Wno-gnu |
d936eb23 LT |
796 | else |
797 | ||
49832c81 RD |
798 | # gcc inanely warns about local variables called 'main' |
799 | KBUILD_CFLAGS += -Wno-main | |
cfe17c9b MY |
800 | endif |
801 | ||
885480b0 NC |
802 | # These warnings generated too much noise in a regular build. |
803 | # Use make W=1 to enable them (see scripts/Makefile.extrawarn) | |
804 | KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) | |
0a5f4176 | 805 | KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) |
6272cc38 | 806 | |
1da177e4 | 807 | ifdef CONFIG_FRAME_POINTER |
a0f97e06 | 808 | KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls |
1da177e4 | 809 | else |
7e9501fd RV |
810 | # Some targets (ARM with Thumb2, for example), can't be built with frame |
811 | # pointers. For those, we don't have FUNCTION_TRACER automatically | |
812 | # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is | |
813 | # incompatible with -fomit-frame-pointer with current GCC, so we don't use | |
814 | # -fomit-frame-pointer with FUNCTION_TRACER. | |
815 | ifndef CONFIG_FUNCTION_TRACER | |
a0f97e06 | 816 | KBUILD_CFLAGS += -fomit-frame-pointer |
1da177e4 | 817 | endif |
7e9501fd | 818 | endif |
1da177e4 | 819 | |
f0fe00d4 | 820 | # Initialize all stack variables with a 0xAA pattern. |
821 | ifdef CONFIG_INIT_STACK_ALL_PATTERN | |
709a972e KC |
822 | KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern |
823 | endif | |
824 | ||
f0fe00d4 | 825 | # Initialize all stack variables with a zero value. |
826 | ifdef CONFIG_INIT_STACK_ALL_ZERO | |
f0fe00d4 | 827 | KBUILD_CFLAGS += -ftrivial-auto-var-init=zero |
f02003c8 KC |
828 | ifdef CONFIG_CC_IS_CLANG |
829 | # https://bugs.llvm.org/show_bug.cgi?id=45497 | |
f0fe00d4 | 830 | KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang |
831 | endif | |
f02003c8 | 832 | endif |
f0fe00d4 | 833 | |
39218ff4 KC |
834 | # While VLAs have been removed, GCC produces unreachable stack probes |
835 | # for the randomize_kstack_offset feature. Disable it for all compilers. | |
836 | KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) | |
837 | ||
a82adfd5 KC |
838 | # Clear used registers at func exit (to reduce data lifetime and ROP gadgets). |
839 | ifdef CONFIG_ZERO_CALL_USED_REGS | |
840 | KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr | |
841 | endif | |
842 | ||
606576ce | 843 | ifdef CONFIG_FUNCTION_TRACER |
3b15cdc1 ST |
844 | ifdef CONFIG_FTRACE_MCOUNT_USE_CC |
845 | CC_FLAGS_FTRACE += -mrecord-mcount | |
2f4df001 VG |
846 | ifdef CONFIG_HAVE_NOP_MCOUNT |
847 | ifeq ($(call cc-option-yn, -mnop-mcount),y) | |
848 | CC_FLAGS_FTRACE += -mnop-mcount | |
849 | CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT | |
850 | endif | |
851 | endif | |
07d04081 | 852 | endif |
22c8542d ST |
853 | ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL |
854 | CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT | |
855 | endif | |
3b15cdc1 ST |
856 | ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT |
857 | ifdef CONFIG_HAVE_C_RECORDMCOUNT | |
858 | BUILD_C_RECORDMCOUNT := y | |
859 | export BUILD_C_RECORDMCOUNT | |
860 | endif | |
861 | endif | |
a2546fae | 862 | ifdef CONFIG_HAVE_FENTRY |
7d73c3e9 | 863 | # s390-linux-gnu-gcc did not support -mfentry until gcc-9. |
f28bc3c3 VG |
864 | ifeq ($(call cc-option-yn, -mfentry),y) |
865 | CC_FLAGS_FTRACE += -mfentry | |
866 | CC_FLAGS_USING += -DCC_USING_FENTRY | |
867 | endif | |
a2546fae | 868 | endif |
f28bc3c3 VG |
869 | export CC_FLAGS_FTRACE |
870 | KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) | |
871 | KBUILD_AFLAGS += $(CC_FLAGS_USING) | |
16444a8a ACM |
872 | endif |
873 | ||
91341d4b SR |
874 | # We trigger additional mismatches with less inlining |
875 | ifdef CONFIG_DEBUG_SECTION_MISMATCH | |
7d73c3e9 | 876 | KBUILD_CFLAGS += -fno-inline-functions-called-once |
91341d4b SR |
877 | endif |
878 | ||
90ad4052 | 879 | ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION |
e85d1d65 MY |
880 | KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections |
881 | LDFLAGS_vmlinux += --gc-sections | |
90ad4052 MY |
882 | endif |
883 | ||
d08b9f0c ST |
884 | ifdef CONFIG_SHADOW_CALL_STACK |
885 | CC_FLAGS_SCS := -fsanitize=shadow-call-stack | |
886 | KBUILD_CFLAGS += $(CC_FLAGS_SCS) | |
887 | export CC_FLAGS_SCS | |
888 | endif | |
889 | ||
dc5723b0 ST |
890 | ifdef CONFIG_LTO_CLANG |
891 | ifdef CONFIG_LTO_CLANG_THIN | |
2b868952 | 892 | CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit |
7f69180b | 893 | KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache |
dc5723b0 | 894 | else |
2b868952 | 895 | CC_FLAGS_LTO := -flto |
dc5723b0 ST |
896 | endif |
897 | CC_FLAGS_LTO += -fvisibility=hidden | |
22d429e7 ST |
898 | |
899 | # Limit inlining across translation units to reduce binary size | |
900 | KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 | |
24845dcb | 901 | |
0236526d TV |
902 | # Check for frame size exceeding threshold during prolog/epilog insertion |
903 | # when using lld < 13.0.0. | |
24845dcb | 904 | ifneq ($(CONFIG_FRAME_WARN),0) |
0236526d | 905 | ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0) |
24845dcb ND |
906 | KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) |
907 | endif | |
dc5723b0 | 908 | endif |
0236526d | 909 | endif |
dc5723b0 ST |
910 | |
911 | ifdef CONFIG_LTO | |
5e95325f ST |
912 | KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) |
913 | KBUILD_AFLAGS += -fno-lto | |
dc5723b0 ST |
914 | export CC_FLAGS_LTO |
915 | endif | |
916 | ||
cf68fffb ST |
917 | ifdef CONFIG_CFI_CLANG |
918 | CC_FLAGS_CFI := -fsanitize=cfi \ | |
919 | -fsanitize-cfi-cross-dso \ | |
920 | -fno-sanitize-cfi-canonical-jump-tables \ | |
921 | -fno-sanitize-trap=cfi \ | |
922 | -fno-sanitize-blacklist | |
923 | ||
924 | ifdef CONFIG_CFI_PERMISSIVE | |
925 | CC_FLAGS_CFI += -fsanitize-recover=cfi | |
926 | endif | |
927 | ||
928 | # If LTO flags are filtered out, we must also filter out CFI. | |
929 | CC_FLAGS_LTO += $(CC_FLAGS_CFI) | |
930 | KBUILD_CFLAGS += $(CC_FLAGS_CFI) | |
931 | export CC_FLAGS_CFI | |
932 | endif | |
933 | ||
cf536e18 FT |
934 | ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B |
935 | KBUILD_CFLAGS += -falign-functions=64 | |
09c60546 FT |
936 | endif |
937 | ||
e8e69931 | 938 | # arch Makefile may override CC so keep this after arch Makefile is included |
04e85bbf | 939 | NOSTDINC_FLAGS += -nostdinc |
e8e69931 | 940 | |
1da177e4 | 941 | # warn about C99 declaration after statement |
a33e7ae2 | 942 | KBUILD_CFLAGS += -Wdeclaration-after-statement |
1da177e4 | 943 | |
0bb95f80 | 944 | # Variable Length Arrays (VLAs) should not be used anywhere in the kernel |
8289f913 | 945 | KBUILD_CFLAGS += -Wvla |
0bb95f80 | 946 | |
070b98bf | 947 | # disable pointer signed / unsigned warnings in gcc 4.0 |
fb073a4b | 948 | KBUILD_CFLAGS += -Wno-pointer-sign |
1da177e4 | 949 | |
552a23a0 GS |
950 | # In order to make sure new function cast mismatches are not introduced |
951 | # in the kernel (to avoid tripping CFI checking), the kernel should be | |
952 | # globally built with -Wcast-function-type. | |
953 | KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type) | |
954 | ||
217c3e01 SR |
955 | # disable stringop warnings in gcc 8+ |
956 | KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) | |
957 | ||
5c45de21 | 958 | # We'll want to enable this eventually, but it's not going away for 5.7 at least |
5a76021c | 959 | KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) |
5c45de21 | 960 | |
adc71920 LT |
961 | # Another good warning that we'll want to enable eventually |
962 | KBUILD_CFLAGS += $(call cc-disable-warning, restrict) | |
963 | ||
78a5255f | 964 | # Enabled with W=2, disabled by default as noisy |
7d73c3e9 ND |
965 | ifdef CONFIG_CC_IS_GCC |
966 | KBUILD_CFLAGS += -Wno-maybe-uninitialized | |
967 | endif | |
78a5255f | 968 | |
86cffecd KC |
969 | ifdef CONFIG_CC_IS_GCC |
970 | # The allocators already balk at large sizes, so silence the compiler | |
971 | # warnings for bounds checks involving those possible values. While | |
972 | # -Wno-alloc-size-larger-than would normally be used here, earlier versions | |
973 | # of gcc (<9.1) weirdly don't handle the option correctly when _other_ | |
974 | # warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX | |
975 | # doesn't work (as it is documented to), silently resolving to "0" prior to | |
976 | # version 9.1 (and producing an error more recently). Numeric values larger | |
977 | # than PTRDIFF_MAX also don't work prior to version 9.1, which are silently | |
978 | # ignored, continuing to default to PTRDIFF_MAX. So, left with no other | |
979 | # choice, we must perform a versioned check to disable this warning. | |
980 | # https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au | |
981 | KBUILD_CFLAGS += $(call cc-ifversion, -ge, 0901, -Wno-alloc-size-larger-than) | |
982 | endif | |
983 | ||
fe8d0a41 | 984 | # disable invalid "can't wrap" optimizations for signed / pointers |
8b42cf2f | 985 | KBUILD_CFLAGS += -fno-strict-overflow |
d0115552 | 986 | |
3ce120b1 | 987 | # Make sure -fstack-check isn't enabled (like gentoo apparently did) |
7d4eb0d8 | 988 | KBUILD_CFLAGS += -fno-stack-check |
3ce120b1 | 989 | |
8f7f5c9f | 990 | # conserve stack if available |
7d73c3e9 ND |
991 | ifdef CONFIG_CC_IS_GCC |
992 | KBUILD_CFLAGS += -fconserve-stack | |
993 | endif | |
8f7f5c9f | 994 | |
fe7c36c7 | 995 | # Prohibit date/time macros, which would make the build non-deterministic |
87de84c9 | 996 | KBUILD_CFLAGS += -Werror=date-time |
fe7c36c7 | 997 | |
ea8daa7b DW |
998 | # enforce correct pointer usage |
999 | KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) | |
1000 | ||
c834f0e8 KC |
1001 | # Require designated initializers for all marked structures |
1002 | KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) | |
1003 | ||
a73619a8 | 1004 | # change __FILE__ to the relative path from the srctree |
a716bd74 | 1005 | KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) |
a73619a8 | 1006 | |
e0fe0bbe MY |
1007 | # include additional Makefiles when needed |
1008 | include-y := scripts/Makefile.extrawarn | |
6947fd96 | 1009 | include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug |
e0fe0bbe MY |
1010 | include-$(CONFIG_KASAN) += scripts/Makefile.kasan |
1011 | include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan | |
1012 | include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan | |
1013 | include-$(CONFIG_KCOV) += scripts/Makefile.kcov | |
613f4b3e | 1014 | include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct |
e0fe0bbe MY |
1015 | include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins |
1016 | ||
1017 | include $(addprefix $(srctree)/, $(include-y)) | |
a86fe353 | 1018 | |
132305b3 MY |
1019 | # scripts/Makefile.gcc-plugins is intentionally included last. |
1020 | # Do not add $(call cc-option,...) below this line. When you build the kernel | |
1021 | # from the clean source tree, the GCC plugins do not exist at this point. | |
a86fe353 | 1022 | |
8cc7af75 MY |
1023 | # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments |
1024 | KBUILD_CPPFLAGS += $(KCPPFLAGS) | |
1025 | KBUILD_AFLAGS += $(KAFLAGS) | |
1026 | KBUILD_CFLAGS += $(KCFLAGS) | |
52bcc330 | 1027 | |
a9684337 BW |
1028 | KBUILD_LDFLAGS_MODULE += --build-id=sha1 |
1029 | LDFLAGS_vmlinux += --build-id=sha1 | |
18991197 | 1030 | |
5d7d18f5 | 1031 | ifeq ($(CONFIG_STRIP_ASM_SYMS),y) |
d79a2719 | 1032 | LDFLAGS_vmlinux += $(call ld-option, -X,) |
5d7d18f5 DH |
1033 | endif |
1034 | ||
5cf896fb | 1035 | ifeq ($(CONFIG_RELR),y) |
27f2a4db | 1036 | LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags |
5cf896fb PC |
1037 | endif |
1038 | ||
59612b24 NC |
1039 | # We never want expected sections to be placed heuristically by the |
1040 | # linker. All sections should be explicitly named in the linker script. | |
1041 | ifdef CONFIG_LD_ORPHAN_WARN | |
1042 | LDFLAGS_vmlinux += --orphan-handling=warn | |
1043 | endif | |
1044 | ||
7f3a59db | 1045 | # Align the bit size of userspace programs with the kernel |
7f58b487 MY |
1046 | KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) |
1047 | KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) | |
7f3a59db | 1048 | |
80591e61 LVO |
1049 | # make the checker run with the right architecture |
1050 | CHECKFLAGS += --arch=$(ARCH) | |
1051 | ||
14516765 LVO |
1052 | # insure the checker run with the right endianness |
1053 | CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) | |
1054 | ||
1f2f01b1 LVO |
1055 | # the checker needs the correct machine size |
1056 | CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) | |
1057 | ||
1da177e4 | 1058 | # Default kernel image to build when no specific target is given. |
070b98bf | 1059 | # KBUILD_IMAGE may be overruled on the command line or |
1da177e4 LT |
1060 | # set in the environment |
1061 | # Also any assignments in arch/$(ARCH)/Makefile take precedence over | |
1062 | # this default value | |
1063 | export KBUILD_IMAGE ?= vmlinux | |
1064 | ||
1065 | # | |
1066 | # INSTALL_PATH specifies where to place the updated kernel and system map | |
1067 | # images. Default is /boot, but you can set it to other values | |
1068 | export INSTALL_PATH ?= /boot | |
1069 | ||
f4d4ffc0 JC |
1070 | # |
1071 | # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. | |
1072 | # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as | |
1073 | # an argument if needed. Otherwise it defaults to the kernel install path | |
1074 | # | |
1075 | export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) | |
1076 | ||
1da177e4 LT |
1077 | # |
1078 | # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory | |
1079 | # relocations required by build roots. This is not defined in the | |
070b98bf | 1080 | # makefile but the argument can be passed to make if needed. |
1da177e4 LT |
1081 | # |
1082 | ||
df9df036 | 1083 | MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) |
1da177e4 LT |
1084 | export MODLIB |
1085 | ||
e00d8880 | 1086 | PHONY += prepare0 |
e2a666d5 | 1087 | |
ccae4cfa | 1088 | export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) |
7f69180b MY |
1089 | export MODORDER := $(extmod_prefix)modules.order |
1090 | export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps | |
47801c97 | 1091 | |
1da177e4 | 1092 | ifeq ($(KBUILD_EXTMOD),) |
4c928904 MY |
1093 | core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ |
1094 | core-$(CONFIG_BLOCK) += block/ | |
1da177e4 | 1095 | |
23febe37 | 1096 | vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ |
1da177e4 | 1097 | $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ |
95fb6317 | 1098 | $(libs-y) $(libs-m))) |
1da177e4 | 1099 | |
1eaca4b9 | 1100 | vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ |
23febe37 | 1101 | $(patsubst %/,%,$(filter %/, $(core-) \ |
95fb6317 | 1102 | $(drivers-) $(libs-)))) |
1da177e4 | 1103 | |
b2c88554 MY |
1104 | subdir-modorder := $(addsuffix modules.order,$(filter %/, \ |
1105 | $(core-y) $(core-m) $(libs-y) $(libs-m) \ | |
1106 | $(drivers-y) $(drivers-m))) | |
1da177e4 | 1107 | |
c99f3918 | 1108 | build-dirs := $(vmlinux-dirs) |
76cd306d | 1109 | clean-dirs := $(vmlinux-alldirs) |
c99f3918 | 1110 | |
f0d50ca0 MY |
1111 | # Externally visible symbols (used by link-vmlinux.sh) |
1112 | KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) | |
1113 | KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) | |
7273ad2b | 1114 | ifdef CONFIG_MODULES |
f0d50ca0 MY |
1115 | KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) |
1116 | KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) | |
7273ad2b | 1117 | else |
f0d50ca0 | 1118 | KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) |
7273ad2b | 1119 | endif |
f0d50ca0 | 1120 | KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) |
1da177e4 | 1121 | |
f0d50ca0 | 1122 | export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS |
95698570 | 1123 | export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds |
85f0ae7e | 1124 | # used by scripts/Makefile.package |
233c741d | 1125 | export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) |
9bb48247 | 1126 | |
d151e971 | 1127 | vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) |
1da177e4 | 1128 | |
3fdc7d3f MY |
1129 | # Recurse until adjust_autoksyms.sh is satisfied |
1130 | PHONY += autoksyms_recursive | |
2441e78b | 1131 | ifdef CONFIG_TRIM_UNUSED_KSYMS |
1f50b80a MY |
1132 | # For the kernel to actually contain only the needed exported symbols, |
1133 | # we have to build modules as well to determine what those symbols are. | |
1134 | # (this can be evaluated only once include/config/auto.conf has been included) | |
fb2d99be MY |
1135 | KBUILD_MODULES := 1 |
1136 | ||
1137 | autoksyms_recursive: descend modules.order | |
1138 | $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ | |
1139 | "$(MAKE) -f $(srctree)/Makefile vmlinux" | |
1f50b80a MY |
1140 | endif |
1141 | ||
07a422bb MY |
1142 | autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) |
1143 | ||
88694cff QP |
1144 | quiet_cmd_autoksyms_h = GEN $@ |
1145 | cmd_autoksyms_h = mkdir -p $(dir $@); \ | |
1146 | $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ | |
1147 | ||
07a422bb | 1148 | $(autoksyms_h): |
88694cff | 1149 | $(call cmd,autoksyms_h) |
23121ca2 | 1150 | |
fbe6e37d NP |
1151 | ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) |
1152 | ||
1153 | # Final link of vmlinux with optional arch pass after final link | |
312a3d09 | 1154 | cmd_link-vmlinux = \ |
3ec8a5b3 | 1155 | $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \ |
fbe6e37d | 1156 | $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) |
2441e78b | 1157 | |
3fdc7d3f | 1158 | vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE |
0b956e20 | 1159 | +$(call if_changed_dep,link-vmlinux) |
741f98fe | 1160 | |
392885ee MY |
1161 | targets := vmlinux |
1162 | ||
38385f8f | 1163 | # The actual objects are generated when descending, |
1da177e4 | 1164 | # make sure no implicit rule kicks in |
b2c88554 | 1165 | $(sort $(vmlinux-deps) $(subdir-modorder)): descend ; |
1da177e4 | 1166 | |
ba97df45 | 1167 | filechk_kernel.release = \ |
0d0e7718 | 1168 | echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" |
0d0e7718 | 1169 | |
83a35e36 | 1170 | # Store (new) KERNELRELEASE string in include/config/kernel.release |
24512795 | 1171 | include/config/kernel.release: FORCE |
0d0e7718 | 1172 | $(call filechk,kernel.release) |
cb58455c | 1173 | |
d8821622 MY |
1174 | # Additional helpers built in scripts/ |
1175 | # Carefully list dependencies so we do not try to build scripts twice | |
1176 | # in parallel | |
1177 | PHONY += scripts | |
60df1aee | 1178 | scripts: scripts_basic scripts_dtc |
d8821622 | 1179 | $(Q)$(MAKE) $(build)=$(@) |
cb58455c | 1180 | |
1da177e4 | 1181 | # Things we need to do before we recursively start building the kernel |
5bb78269 SR |
1182 | # or the modules are listed in "prepare". |
1183 | # A multi level approach is used. prepareN is processed before prepareN-1. | |
1184 | # archprepare is used in arch Makefiles and when processed asm symlink, | |
1185 | # version.h and scripts_basic is processed / created. | |
1da177e4 | 1186 | |
a5139fb3 | 1187 | PHONY += prepare archprepare |
5bb78269 | 1188 | |
36de077b | 1189 | archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ |
3044dd05 | 1190 | asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ |
1476fee5 | 1191 | include/generated/autoconf.h remove-stale-files |
5bb78269 | 1192 | |
65bba042 | 1193 | prepare0: archprepare |
60df1aee | 1194 | $(Q)$(MAKE) $(build)=scripts/mod |
8d36a623 | 1195 | $(Q)$(MAKE) $(build)=. |
86feeaa8 | 1196 | |
1da177e4 | 1197 | # All the preparing.. |
0d989ac2 | 1198 | prepare: prepare0 |
b9ab5ebb | 1199 | |
1476fee5 MY |
1200 | PHONY += remove-stale-files |
1201 | remove-stale-files: | |
1202 | $(Q)$(srctree)/scripts/remove-stale-files | |
1203 | ||
2c1f4f12 | 1204 | # Support for using generic headers in asm-generic |
7d0e5c20 MY |
1205 | asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj |
1206 | ||
2c1f4f12 MY |
1207 | PHONY += asm-generic uapi-asm-generic |
1208 | asm-generic: uapi-asm-generic | |
037fc336 MY |
1209 | $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ |
1210 | generic=include/asm-generic | |
2c1f4f12 | 1211 | uapi-asm-generic: |
037fc336 MY |
1212 | $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ |
1213 | generic=include/uapi/asm-generic | |
2c1f4f12 | 1214 | |
1da177e4 LT |
1215 | # Generate some files |
1216 | # --------------------------------------------------------------------------- | |
1217 | ||
1218 | # KERNELRELEASE can change from a few different places, meaning version.h | |
1219 | # needs to be updated, so this check is forced on all builds | |
1220 | ||
1221 | uts_len := 64 | |
63104eec SR |
1222 | define filechk_utsrelease.h |
1223 | if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ | |
1224 | echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ | |
1225 | exit 1; \ | |
1226 | fi; \ | |
ad774086 | 1227 | echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" |
63104eec | 1228 | endef |
1da177e4 LT |
1229 | |
1230 | define filechk_version.h | |
9b82f13e SL |
1231 | if [ $(SUBLEVEL) -gt 255 ]; then \ |
1232 | echo \#define LINUX_VERSION_CODE $(shell \ | |
207da4c8 | 1233 | expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ |
9b82f13e SL |
1234 | else \ |
1235 | echo \#define LINUX_VERSION_CODE $(shell \ | |
207da4c8 | 1236 | expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ |
9b82f13e SL |
1237 | fi; \ |
1238 | echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ | |
88a68672 SL |
1239 | ((c) > 255 ? 255 : (c)))'; \ |
1240 | echo \#define LINUX_VERSION_MAJOR $(VERSION); \ | |
1241 | echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ | |
1242 | echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) | |
1da177e4 LT |
1243 | endef |
1244 | ||
5c816641 MY |
1245 | $(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0) |
1246 | $(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0) | |
43fee2b2 | 1247 | $(version_h): FORCE |
1da177e4 LT |
1248 | $(call filechk,version.h) |
1249 | ||
273b281f | 1250 | include/generated/utsrelease.h: include/config/kernel.release FORCE |
63104eec SR |
1251 | $(call filechk,utsrelease.h) |
1252 | ||
179efcb4 VN |
1253 | PHONY += headerdep |
1254 | headerdep: | |
9663d989 PF |
1255 | $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ |
1256 | $(srctree)/scripts/headerdep.pl -I$(srctree)/include | |
179efcb4 | 1257 | |
8d730cfb DW |
1258 | # --------------------------------------------------------------------------- |
1259 | # Kernel headers | |
8d730cfb | 1260 | |
e6883b18 SR |
1261 | #Default location for installed headers |
1262 | export INSTALL_HDR_PATH = $(objtree)/usr | |
6d716275 | 1263 | |
59b2bd05 MY |
1264 | quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include |
1265 | cmd_headers_install = \ | |
1266 | mkdir -p $(INSTALL_HDR_PATH); \ | |
1267 | rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ | |
1268 | usr/include $(INSTALL_HDR_PATH) | |
e6883b18 | 1269 | |
8d730cfb | 1270 | PHONY += headers_install |
59b2bd05 MY |
1271 | headers_install: headers |
1272 | $(call cmd,headers_install) | |
6520fe55 | 1273 | |
59b2bd05 | 1274 | PHONY += archheaders archscripts |
e6883b18 | 1275 | |
a5bae54c | 1276 | hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj |
6d716275 | 1277 | |
59b2bd05 MY |
1278 | PHONY += headers |
1279 | headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts | |
9d022c54 | 1280 | $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ |
10b63956 | 1281 | $(error Headers not exportable for the $(SRCARCH) architecture)) |
d5470d14 MY |
1282 | $(Q)$(MAKE) $(hdr-inst)=include/uapi |
1283 | $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi | |
1f85712e | 1284 | |
e949f4c2 | 1285 | ifdef CONFIG_HEADERS_INSTALL |
59b2bd05 | 1286 | prepare: headers |
e949f4c2 | 1287 | endif |
68475359 | 1288 | |
bdd7714b MY |
1289 | PHONY += scripts_unifdef |
1290 | scripts_unifdef: scripts_basic | |
1291 | $(Q)$(MAKE) $(build)=scripts scripts/unifdef | |
1292 | ||
14ccc638 MY |
1293 | # --------------------------------------------------------------------------- |
1294 | # Install | |
1295 | ||
1296 | # Many distributions have the custom install script, /sbin/installkernel. | |
1297 | # If DKMS is installed, 'make install' will eventually recuses back | |
1298 | # to the this Makefile to build and install external modules. | |
1299 | # Cancel sub_make_done so that options such as M=, V=, etc. are parsed. | |
1300 | ||
1301 | install: sub_make_done := | |
1302 | ||
1bb0b18a MY |
1303 | # --------------------------------------------------------------------------- |
1304 | # Tools | |
1305 | ||
03f16cd0 | 1306 | ifdef CONFIG_OBJTOOL |
0d989ac2 MY |
1307 | prepare: tools/objtool |
1308 | endif | |
1309 | ||
1310 | ifdef CONFIG_BPF | |
1311 | ifdef CONFIG_DEBUG_INFO_BTF | |
1312 | prepare: tools/bpf/resolve_btfids | |
1313 | endif | |
1314 | endif | |
1315 | ||
1316 | PHONY += resolve_btfids_clean | |
1317 | ||
1318 | resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids | |
1319 | ||
1320 | # tools/bpf/resolve_btfids directory might not exist | |
1321 | # in output directory, skip its clean in that case | |
1322 | resolve_btfids_clean: | |
1323 | ifneq ($(wildcard $(resolve_btfids_O)),) | |
1324 | $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean | |
1325 | endif | |
1326 | ||
1bb0b18a MY |
1327 | # Clear a bunch of variables before executing the submake |
1328 | ifeq ($(quiet),silent_) | |
1329 | tools_silent=s | |
1330 | endif | |
1331 | ||
1332 | tools/: FORCE | |
1333 | $(Q)mkdir -p $(objtree)/tools | |
1334 | $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ | |
1335 | ||
1336 | tools/%: FORCE | |
1337 | $(Q)mkdir -p $(objtree)/tools | |
1338 | $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* | |
1339 | ||
5a5da78b SK |
1340 | # --------------------------------------------------------------------------- |
1341 | # Kernel selftest | |
1342 | ||
1343 | PHONY += kselftest | |
1344 | kselftest: | |
2bc84526 | 1345 | $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests |
5a5da78b | 1346 | |
17eac6c2 SK |
1347 | kselftest-%: FORCE |
1348 | $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* | |
dcb825a9 | 1349 | |
3d6dee7a BJZ |
1350 | PHONY += kselftest-merge |
1351 | kselftest-merge: | |
1352 | $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) | |
6d3db46c DR |
1353 | $(Q)find $(srctree)/tools/testing/selftests -name config | \ |
1354 | xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config | |
3e4c6948 | 1355 | $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig |
3d6dee7a | 1356 | |
37c8a5fa RH |
1357 | # --------------------------------------------------------------------------- |
1358 | # Devicetree files | |
1359 | ||
1360 | ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) | |
1361 | dtstree := arch/$(SRCARCH)/boot/dts | |
1362 | endif | |
1363 | ||
1364 | ifneq ($(dtstree),) | |
1365 | ||
75e89534 RH |
1366 | %.dtb: include/config/kernel.release scripts_dtc |
1367 | $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ | |
37c8a5fa | 1368 | |
75e89534 RH |
1369 | %.dtbo: include/config/kernel.release scripts_dtc |
1370 | $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ | |
ce88c9c7 | 1371 | |
c473a8d0 | 1372 | PHONY += dtbs dtbs_install dtbs_check |
b5154bf6 | 1373 | dtbs: include/config/kernel.release scripts_dtc |
37c8a5fa RH |
1374 | $(Q)$(MAKE) $(build)=$(dtstree) |
1375 | ||
75e89534 | 1376 | ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) |
e10c4321 | 1377 | export CHECK_DTBS=y |
b5154bf6 MY |
1378 | dtbs: dt_binding_check |
1379 | endif | |
1380 | ||
b5154bf6 | 1381 | dtbs_check: dtbs |
4f0e3a57 | 1382 | |
37c8a5fa | 1383 | dtbs_install: |
2431f22a | 1384 | $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) |
37c8a5fa RH |
1385 | |
1386 | ifdef CONFIG_OF_EARLY_FLATTREE | |
1387 | all: dtbs | |
1388 | endif | |
1389 | ||
1390 | endif | |
1391 | ||
1392 | PHONY += scripts_dtc | |
1393 | scripts_dtc: scripts_basic | |
1394 | $(Q)$(MAKE) $(build)=scripts/dtc | |
1395 | ||
e10c4321 MY |
1396 | ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) |
1397 | export CHECK_DT_BINDING=y | |
1398 | endif | |
1399 | ||
c473a8d0 | 1400 | PHONY += dt_binding_check |
4f0e3a57 RH |
1401 | dt_binding_check: scripts_dtc |
1402 | $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings | |
1403 | ||
1da177e4 LT |
1404 | # --------------------------------------------------------------------------- |
1405 | # Modules | |
1406 | ||
1407 | ifdef CONFIG_MODULES | |
1408 | ||
070b98bf | 1409 | # By default, build modules as well |
1da177e4 | 1410 | |
73d1393e | 1411 | all: modules |
1da177e4 | 1412 | |
4b50c8c4 MY |
1413 | # When we're building modules with modversions, we need to consider |
1414 | # the built-in objects during the descend as well, in order to | |
1415 | # make sure the checksums are up to date before we record them. | |
1416 | ifdef CONFIG_MODVERSIONS | |
1417 | KBUILD_BUILTIN := 1 | |
1418 | endif | |
1419 | ||
3fbb43df | 1420 | # Build modules |
551559e1 | 1421 | # |
3fbb43df MY |
1422 | # A module can be listed more than once in obj-m resulting in |
1423 | # duplicate lines in modules.order files. Those are removed | |
1424 | # using awk while concatenating to the final file. | |
1da177e4 | 1425 | |
4f193362 | 1426 | PHONY += modules |
596b0474 | 1427 | modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare |
1da177e4 | 1428 | |
b2c88554 MY |
1429 | cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ |
1430 | ||
1431 | modules.order: $(subdir-modorder) FORCE | |
1432 | $(call if_changed,modules_order) | |
1433 | ||
1434 | targets += modules.order | |
68980b47 | 1435 | |
1da177e4 | 1436 | # Target to prepare building external modules |
4f193362 | 1437 | PHONY += modules_prepare |
059bc9fc | 1438 | modules_prepare: prepare |
596b0474 | 1439 | $(Q)$(MAKE) $(build)=scripts scripts/module.lds |
1da177e4 | 1440 | |
961ab4a3 MY |
1441 | export modules_sign_only := |
1442 | ||
1443 | ifeq ($(CONFIG_MODULE_SIG),y) | |
1444 | PHONY += modules_sign | |
1445 | modules_sign: modules_install | |
1446 | @: | |
1da177e4 | 1447 | |
961ab4a3 MY |
1448 | # modules_sign is a subset of modules_install. |
1449 | # 'make modules_install modules_sign' is equivalent to 'make modules_install'. | |
1450 | ifeq ($(filter modules_install,$(MAKECMDGOALS)),) | |
1451 | modules_sign_only := y | |
1452 | endif | |
1453 | endif | |
1454 | ||
1455 | modinst_pre := | |
1456 | ifneq ($(filter modules_install,$(MAKECMDGOALS)),) | |
1457 | modinst_pre := __modinst_pre | |
1458 | endif | |
1459 | ||
1460 | modules_install: $(modinst_pre) | |
3e3005df MY |
1461 | PHONY += __modinst_pre |
1462 | __modinst_pre: | |
1da177e4 LT |
1463 | @rm -rf $(MODLIB)/kernel |
1464 | @rm -f $(MODLIB)/source | |
1465 | @mkdir -p $(MODLIB)/kernel | |
8e9b4667 | 1466 | @ln -s $(abspath $(srctree)) $(MODLIB)/source |
1da177e4 LT |
1467 | @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ |
1468 | rm -f $(MODLIB)/build ; \ | |
7e1c0477 | 1469 | ln -s $(CURDIR) $(MODLIB)/build ; \ |
1da177e4 | 1470 | fi |
1bd9a468 | 1471 | @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order |
2c6d9636 MY |
1472 | @cp -f modules.builtin $(MODLIB)/ |
1473 | @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ | |
1da177e4 LT |
1474 | |
1475 | endif # CONFIG_MODULES | |
1476 | ||
1da177e4 LT |
1477 | ### |
1478 | # Cleaning is done on three levels. | |
1479 | # make clean Delete most generated files | |
1480 | # Leave enough to build external modules | |
1481 | # make mrproper Delete the current configuration, and all generated files | |
1482 | # make distclean Remove editor backup files, patch leftover files and the like | |
1483 | ||
1484 | # Directories & files removed with 'make clean' | |
69bc8d38 | 1485 | CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ |
3d32285f | 1486 | modules.builtin modules.builtin.modinfo modules.nsdeps \ |
4c7858b9 | 1487 | compile_commands.json .thinlto-cache |
1da177e4 LT |
1488 | |
1489 | # Directories & files removed with 'make mrproper' | |
0663c68c | 1490 | MRPROPER_FILES += include/config include/generated \ |
46a63d4b | 1491 | arch/$(SRCARCH)/include/generated .tmp_objdiff \ |
0663c68c MY |
1492 | debian snap tar-install \ |
1493 | .config .config.old .version \ | |
46457133 | 1494 | Module.symvers \ |
5cca3606 | 1495 | certs/signing_key.pem \ |
b31f2a49 NJ |
1496 | certs/x509.genkey \ |
1497 | vmlinux-gdb.py \ | |
46a63d4b | 1498 | *.spec |
1da177e4 LT |
1499 | |
1500 | # clean - Delete most, but leave enough to build external modules | |
1501 | # | |
1da177e4 | 1502 | clean: rm-files := $(CLEAN_FILES) |
1da177e4 | 1503 | |
76cd306d | 1504 | PHONY += archclean vmlinuxclean |
1da177e4 | 1505 | |
bd1ee804 PM |
1506 | vmlinuxclean: |
1507 | $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean | |
fbe6e37d | 1508 | $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) |
bd1ee804 | 1509 | |
50d3a3f8 | 1510 | clean: archclean vmlinuxclean resolve_btfids_clean |
1da177e4 LT |
1511 | |
1512 | # mrproper - Delete all generated files, including .config | |
1513 | # | |
1da177e4 | 1514 | mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) |
cb43fb57 | 1515 | mrproper-dirs := $(addprefix _mrproper_,scripts) |
1da177e4 | 1516 | |
b421b8a6 | 1517 | PHONY += $(mrproper-dirs) mrproper |
1da177e4 LT |
1518 | $(mrproper-dirs): |
1519 | $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) | |
1520 | ||
b421b8a6 | 1521 | mrproper: clean $(mrproper-dirs) |
1da177e4 LT |
1522 | $(call cmd,rmfiles) |
1523 | ||
1524 | # distclean | |
1525 | # | |
4f193362 | 1526 | PHONY += distclean |
1da177e4 LT |
1527 | |
1528 | distclean: mrproper | |
19c8d912 | 1529 | @find . $(RCS_FIND_IGNORE) \ |
070b98bf | 1530 | \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ |
f78271df | 1531 | -o -name '*.bak' -o -name '#*#' -o -name '*%' \ |
7a02cec5 MY |
1532 | -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ |
1533 | -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ | |
1da177e4 LT |
1534 | -type f -print | xargs rm -f |
1535 | ||
1536 | ||
1537 | # Packaging of the kernel to various formats | |
1538 | # --------------------------------------------------------------------------- | |
1da177e4 | 1539 | |
bafb6747 | 1540 | %src-pkg: FORCE |
000ec95f | 1541 | $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ |
031ecc6d | 1542 | %pkg: include/config/kernel.release FORCE |
000ec95f | 1543 | $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ |
1da177e4 LT |
1544 | |
1545 | # Brief documentation of the typical targets used | |
1546 | # --------------------------------------------------------------------------- | |
1547 | ||
5dffbe81 | 1548 | boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) |
a1e7b7bb | 1549 | boards := $(sort $(notdir $(boards))) |
5dffbe81 SB |
1550 | board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) |
1551 | board-dirs := $(sort $(notdir $(board-dirs:/=))) | |
1da177e4 | 1552 | |
fe69b420 | 1553 | PHONY += help |
1da177e4 LT |
1554 | help: |
1555 | @echo 'Cleaning targets:' | |
5ea084ef | 1556 | @echo ' clean - Remove most generated files but keep the config and' |
5cc8d246 | 1557 | @echo ' enough build support to build external modules' |
5ea084ef | 1558 | @echo ' mrproper - Remove all generated files + config + various backup files' |
5cc8d246 | 1559 | @echo ' distclean - mrproper + remove editor backup and patch files' |
1da177e4 LT |
1560 | @echo '' |
1561 | @echo 'Configuration targets:' | |
1562 | @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help | |
1563 | @echo '' | |
1564 | @echo 'Other generic targets:' | |
1565 | @echo ' all - Build all targets marked with [*]' | |
1566 | @echo '* vmlinux - Build the bare kernel' | |
1567 | @echo '* modules - Build all modules' | |
9cc5d74c | 1568 | @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' |
1da177e4 | 1569 | @echo ' dir/ - Build all files in dir and below' |
40ab87a4 | 1570 | @echo ' dir/file.[ois] - Build specified target only' |
433db3e2 VT |
1571 | @echo ' dir/file.ll - Build the LLVM assembly file' |
1572 | @echo ' (requires compiler support for LLVM assembly generation)' | |
62718979 JP |
1573 | @echo ' dir/file.lst - Build specified mixed source/assembly target only' |
1574 | @echo ' (requires a recent binutils and recent build (System.map))' | |
155ad605 | 1575 | @echo ' dir/file.ko - Build module including final link' |
c4d5ee67 | 1576 | @echo ' modules_prepare - Set up for building external modules' |
1da177e4 LT |
1577 | @echo ' tags/TAGS - Generate tags file for editors' |
1578 | @echo ' cscope - Generate cscope index' | |
f4ed1009 | 1579 | @echo ' gtags - Generate GNU GLOBAL index' |
3f1d9a6c MM |
1580 | @echo ' kernelrelease - Output the release version string (use with make -s)' |
1581 | @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' | |
1582 | @echo ' image_name - Output the image name (use with make -s)' | |
2fb9b1bd | 1583 | @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ |
59df3230 | 1584 | echo ' (default: $(INSTALL_HDR_PATH))'; \ |
2fb9b1bd | 1585 | echo '' |
31b8cc80 | 1586 | @echo 'Static analysers:' |
1da177e4 | 1587 | @echo ' checkstack - Generate a list of stack hogs' |
aa025e7d | 1588 | @echo ' versioncheck - Sanity check on version.h usage' |
ec2d987f | 1589 | @echo ' includecheck - Check for duplicate included header files' |
295ac051 | 1590 | @echo ' export_report - List the usages of all exported symbols' |
74425eee | 1591 | @echo ' headerdep - Detect inclusion cycles in headers' |
7f855fc8 | 1592 | @echo ' coccicheck - Check with Coccinelle' |
6ad7cbc0 NH |
1593 | @echo ' clang-analyzer - Check with clang static analyzer' |
1594 | @echo ' clang-tidy - Check with clang-tidy' | |
74425eee | 1595 | @echo '' |
eb8305ae MM |
1596 | @echo 'Tools:' |
1597 | @echo ' nsdeps - Generate missing symbol namespace dependencies' | |
1598 | @echo '' | |
31b8cc80 | 1599 | @echo 'Kernel selftest:' |
e51d8dac SK |
1600 | @echo ' kselftest - Build and run kernel selftest' |
1601 | @echo ' Build, install, and boot kernel before' | |
1602 | @echo ' running kselftest on it' | |
1603 | @echo ' Run as root for full coverage' | |
1604 | @echo ' kselftest-all - Build kernel selftest' | |
1605 | @echo ' kselftest-install - Build and install kernel selftest' | |
1606 | @echo ' kselftest-clean - Remove all generated kselftest files' | |
1607 | @echo ' kselftest-merge - Merge all the config dependencies of' | |
1608 | @echo ' kselftest to existing .config.' | |
5a5da78b | 1609 | @echo '' |
37c8a5fa RH |
1610 | @$(if $(dtstree), \ |
1611 | echo 'Devicetree:'; \ | |
7aa8dd91 SB |
1612 | echo '* dtbs - Build device tree blobs for enabled boards'; \ |
1613 | echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ | |
1614 | echo ' dt_binding_check - Validate device tree binding documents'; \ | |
1615 | echo ' dtbs_check - Validate device tree source files';\ | |
37c8a5fa RH |
1616 | echo '') |
1617 | ||
31b8cc80 RD |
1618 | @echo 'Userspace tools targets:' |
1619 | @echo ' use "make tools/help"' | |
1620 | @echo ' or "cd tools; make help"' | |
1621 | @echo '' | |
1da177e4 | 1622 | @echo 'Kernel packaging:' |
000ec95f | 1623 | @$(MAKE) -f $(srctree)/scripts/Makefile.package help |
1da177e4 LT |
1624 | @echo '' |
1625 | @echo 'Documentation targets:' | |
cb43fb57 | 1626 | @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp |
1da177e4 | 1627 | @echo '' |
01dee188 | 1628 | @echo 'Architecture specific targets ($(SRCARCH)):' |
5c816641 | 1629 | @$(or $(archhelp),\ |
01dee188 | 1630 | echo ' No architecture specific help defined for $(SRCARCH)') |
1da177e4 LT |
1631 | @echo '' |
1632 | @$(if $(boards), \ | |
1633 | $(foreach b, $(boards), \ | |
4234448b | 1634 | printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ |
1da177e4 | 1635 | echo '') |
5dffbe81 SB |
1636 | @$(if $(board-dirs), \ |
1637 | $(foreach b, $(board-dirs), \ | |
1638 | printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ | |
1639 | printf " %-16s - Show all of the above\\n" help-boards; \ | |
1640 | echo '') | |
1da177e4 LT |
1641 | |
1642 | @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' | |
45d506bd | 1643 | @echo ' make V=2 [targets] 2 => give reason for rebuild of target' |
1da177e4 | 1644 | @echo ' make O=dir [targets] Locate all output files in "dir", including .config' |
a64c0440 GU |
1645 | @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' |
1646 | @echo ' (sparse by default)' | |
701842e3 | 1647 | @echo ' make C=2 [targets] Force check of all c source with $$CHECK' |
af07ce3e | 1648 | @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' |
e27128db | 1649 | @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' |
28bc20dc SR |
1650 | @echo ' 1: warnings which may be relevant and do not occur too often' |
1651 | @echo ' 2: warnings which occur quite often but may still be relevant' | |
1652 | @echo ' 3: more obscure warnings, can most likely be ignored' | |
a6de553d | 1653 | @echo ' Multiple levels can be combined with W=12 or W=123' |
1da177e4 LT |
1654 | @echo '' |
1655 | @echo 'Execute "make" or "make all" to build all targets marked with [*] ' | |
1656 | @echo 'For further info see the ./README file' | |
1657 | ||
1658 | ||
5dffbe81 SB |
1659 | help-board-dirs := $(addprefix help-,$(board-dirs)) |
1660 | ||
1661 | help-boards: $(help-board-dirs) | |
1662 | ||
fbae4d58 | 1663 | boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) |
5dffbe81 SB |
1664 | |
1665 | $(help-board-dirs): help-%: | |
1666 | @echo 'Architecture specific targets ($(SRCARCH) $*):' | |
1667 | @$(if $(boards-per-dir), \ | |
1668 | $(foreach b, $(boards-per-dir), \ | |
1669 | printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ | |
1670 | echo '') | |
1671 | ||
1672 | ||
1da177e4 LT |
1673 | # Documentation targets |
1674 | # --------------------------------------------------------------------------- | |
e8939222 JN |
1675 | DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ |
1676 | linkcheckdocs dochelp refcheckdocs | |
22cba31b | 1677 | PHONY += $(DOC_TARGETS) |
bc7b752a | 1678 | $(DOC_TARGETS): |
cb43fb57 | 1679 | $(Q)$(MAKE) $(build)=Documentation $@ |
1da177e4 | 1680 | |
67274c08 MY |
1681 | # Misc |
1682 | # --------------------------------------------------------------------------- | |
1683 | ||
1684 | PHONY += scripts_gdb | |
7a739ce5 | 1685 | scripts_gdb: prepare0 |
1e5ff84f | 1686 | $(Q)$(MAKE) $(build)=scripts/gdb |
8d2e5200 | 1687 | $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) |
67274c08 MY |
1688 | |
1689 | ifdef CONFIG_GDB_SCRIPTS | |
1690 | all: scripts_gdb | |
1691 | endif | |
1692 | ||
1da177e4 LT |
1693 | else # KBUILD_EXTMOD |
1694 | ||
1695 | ### | |
1696 | # External module support. | |
1697 | # When building external modules the kernel used as basis is considered | |
1698 | # read-only, and no consistency checks are made and the make | |
1699 | # system is not used on the basis kernel. If updates are required | |
11122b86 | 1700 | # in the basis kernel ordinary make commands (without M=...) must be used. |
1da177e4 | 1701 | |
6212804f MY |
1702 | # We are always building only modules. |
1703 | KBUILD_BUILTIN := | |
1da177e4 | 1704 | KBUILD_MODULES := 1 |
1da177e4 | 1705 | |
c99f3918 | 1706 | build-dirs := $(KBUILD_EXTMOD) |
3d32285f MY |
1707 | $(MODORDER): descend |
1708 | @: | |
1709 | ||
7f69180b | 1710 | compile_commands.json: $(extmod_prefix)compile_commands.json |
3d32285f MY |
1711 | PHONY += compile_commands.json |
1712 | ||
76cd306d | 1713 | clean-dirs := $(KBUILD_EXTMOD) |
3d32285f | 1714 | clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ |
dc5723b0 | 1715 | $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache |
1da177e4 | 1716 | |
6072b2c4 MY |
1717 | PHONY += prepare |
1718 | # now expand this into a simple variable to reduce the cost of shell evaluations | |
1719 | prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) | |
1720 | prepare: | |
129ab0d2 | 1721 | @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ |
6072b2c4 | 1722 | echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ |
129ab0d2 | 1723 | echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ |
6072b2c4 MY |
1724 | echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ |
1725 | fi | |
1726 | ||
fe69b420 | 1727 | PHONY += help |
1da177e4 LT |
1728 | help: |
1729 | @echo ' Building external modules.' | |
1730 | @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' | |
1731 | @echo '' | |
1732 | @echo ' modules - default target, build the module(s)' | |
1733 | @echo ' modules_install - install the module' | |
1734 | @echo ' clean - remove generated files in module directory only' | |
1735 | @echo '' | |
06300b21 | 1736 | |
596b0474 | 1737 | # no-op for external module builds |
6072b2c4 | 1738 | PHONY += modules_prepare |
596b0474 | 1739 | |
1da177e4 LT |
1740 | endif # KBUILD_EXTMOD |
1741 | ||
3e3005df MY |
1742 | # --------------------------------------------------------------------------- |
1743 | # Modules | |
1744 | ||
1745 | PHONY += modules modules_install | |
1746 | ||
1747 | ifdef CONFIG_MODULES | |
1748 | ||
1a998be6 | 1749 | modules: modules_check |
3e3005df MY |
1750 | $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost |
1751 | ||
1a998be6 MY |
1752 | PHONY += modules_check |
1753 | modules_check: $(MODORDER) | |
1754 | $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< | |
1755 | ||
3ac42b21 | 1756 | quiet_cmd_depmod = DEPMOD $(MODLIB) |
3e3005df MY |
1757 | cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ |
1758 | $(KERNELRELEASE) | |
1759 | ||
1760 | modules_install: | |
1761 | $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst | |
1762 | $(call cmd,depmod) | |
1763 | ||
1764 | else # CONFIG_MODULES | |
1765 | ||
1766 | # Modules not configured | |
1767 | # --------------------------------------------------------------------------- | |
1768 | ||
1769 | modules modules_install: | |
1770 | @echo >&2 '***' | |
1771 | @echo >&2 '*** The present kernel configuration has modules disabled.' | |
1772 | @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.' | |
1773 | @echo >&2 '*** to enable CONFIG_MODULES.' | |
1774 | @echo >&2 '***' | |
1775 | @exit 1 | |
1776 | ||
1777 | endif # CONFIG_MODULES | |
1778 | ||
b1fbfcb4 MY |
1779 | # Single targets |
1780 | # --------------------------------------------------------------------------- | |
1781 | # To build individual files in subdirectories, you can do like this: | |
1782 | # | |
1783 | # make foo/bar/baz.s | |
1784 | # | |
1785 | # The supported suffixes for single-target are listed in 'single-targets' | |
1786 | # | |
1787 | # To build only under specific subdirectories, you can do like this: | |
1788 | # | |
1789 | # make foo/bar/baz/ | |
1790 | ||
1791 | ifdef single-build | |
1792 | ||
1793 | # .ko is special because modpost is needed | |
1794 | single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) | |
1795 | single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) | |
1796 | ||
1797 | $(single-ko): single_modpost | |
1798 | @: | |
1799 | $(single-no-ko): descend | |
1800 | @: | |
1801 | ||
1802 | ifeq ($(KBUILD_EXTMOD),) | |
1803 | # For the single build of in-tree modules, use a temporary file to avoid | |
1804 | # the situation of modules_install installing an invalid modules.order. | |
1805 | MODORDER := .modules.tmp | |
1806 | endif | |
1807 | ||
1808 | PHONY += single_modpost | |
596b0474 | 1809 | single_modpost: $(single-no-ko) modules_prepare |
7f69180b | 1810 | $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER) |
b1fbfcb4 MY |
1811 | $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost |
1812 | ||
1813 | KBUILD_MODULES := 1 | |
1814 | ||
7f69180b | 1815 | export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod_prefix), $(single-no-ko)) |
b1fbfcb4 MY |
1816 | |
1817 | # trim unrelated directories | |
1818 | build-dirs := $(foreach d, $(build-dirs), \ | |
1819 | $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) | |
1820 | ||
1821 | endif | |
1822 | ||
b480fec9 MY |
1823 | ifndef CONFIG_MODULES |
1824 | KBUILD_MODULES := | |
1825 | endif | |
1826 | ||
c99f3918 MY |
1827 | # Handle descending into subdirectories listed in $(build-dirs) |
1828 | # Preset locale variables to speed up the build process. Limit locale | |
1829 | # tweaks to this spot to avoid wrong language settings when running | |
1830 | # make menuconfig etc. | |
1831 | # Error messages still appears in the original language | |
1832 | PHONY += descend $(build-dirs) | |
1833 | descend: $(build-dirs) | |
1834 | $(build-dirs): prepare | |
b1fbfcb4 | 1835 | $(Q)$(MAKE) $(build)=$@ \ |
20b1be59 | 1836 | single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ |
b1fbfcb4 | 1837 | need-builtin=1 need-modorder=1 |
c99f3918 | 1838 | |
76cd306d MY |
1839 | clean-dirs := $(addprefix _clean_, $(clean-dirs)) |
1840 | PHONY += $(clean-dirs) clean | |
1841 | $(clean-dirs): | |
1842 | $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) | |
1843 | ||
88d7be03 | 1844 | clean: $(clean-dirs) |
88d7be03 | 1845 | $(call cmd,rmfiles) |
5c816641 | 1846 | @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ |
ef46d9b3 | 1847 | \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ |
4f0e3a57 | 1848 | -o -name '*.ko.*' \ |
ce88c9c7 | 1849 | -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ |
ef46d9b3 | 1850 | -o -name '*.dwo' -o -name '*.lst' \ |
bbc55bde | 1851 | -o -name '*.su' -o -name '*.mod' \ |
88d7be03 | 1852 | -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ |
9a8dfb39 | 1853 | -o -name '*.lex.c' -o -name '*.tab.[ch]' \ |
4fa8bc94 | 1854 | -o -name '*.asn1.[ch]' \ |
88d7be03 | 1855 | -o -name '*.symtypes' -o -name 'modules.order' \ |
8b41fc44 | 1856 | -o -name '.tmp_*.o.*' \ |
6b90bd4b | 1857 | -o -name '*.c.[012]*.*' \ |
433db3e2 | 1858 | -o -name '*.ll' \ |
38e89184 ST |
1859 | -o -name '*.gcno' \ |
1860 | -o -name '*.*.symversions' \) -type f -print | xargs rm -f | |
88d7be03 | 1861 | |
1da177e4 LT |
1862 | # Generate tags for editors |
1863 | # --------------------------------------------------------------------------- | |
a680eedc | 1864 | quiet_cmd_tags = GEN $@ |
858805b3 | 1865 | cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ |
1da177e4 | 1866 | |
f4ed1009 | 1867 | tags TAGS cscope gtags: FORCE |
1da177e4 LT |
1868 | $(call cmd,tags) |
1869 | ||
eb8305ae MM |
1870 | # Script to generate missing namespace dependencies |
1871 | # --------------------------------------------------------------------------- | |
1872 | ||
1873 | PHONY += nsdeps | |
bff9c62b | 1874 | nsdeps: export KBUILD_NSDEPS=1 |
eb8305ae | 1875 | nsdeps: modules |
bff9c62b | 1876 | $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps |
eb8305ae | 1877 | |
3d32285f MY |
1878 | # Clang Tooling |
1879 | # --------------------------------------------------------------------------- | |
1880 | ||
1881 | quiet_cmd_gen_compile_commands = GEN $@ | |
1882 | cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) | |
1883 | ||
7f69180b | 1884 | $(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ |
3d32285f MY |
1885 | $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \ |
1886 | $(if $(CONFIG_MODULES), $(MODORDER)) FORCE | |
1887 | $(call if_changed,gen_compile_commands) | |
1888 | ||
7f69180b | 1889 | targets += $(extmod_prefix)compile_commands.json |
3d32285f | 1890 | |
6ad7cbc0 NH |
1891 | PHONY += clang-tidy clang-analyzer |
1892 | ||
1893 | ifdef CONFIG_CC_IS_CLANG | |
1894 | quiet_cmd_clang_tools = CHECK $< | |
1895 | cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< | |
1896 | ||
7f69180b | 1897 | clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json |
6ad7cbc0 NH |
1898 | $(call cmd,clang_tools) |
1899 | else | |
1900 | clang-tidy clang-analyzer: | |
1901 | @echo "$@ requires CC=clang" >&2 | |
1902 | @false | |
1903 | endif | |
1904 | ||
1da177e4 LT |
1905 | # Scripts to check various things for consistency |
1906 | # --------------------------------------------------------------------------- | |
1907 | ||
7dfbea4c | 1908 | PHONY += includecheck versioncheck coccicheck export_report |
279f3dd3 | 1909 | |
1da177e4 | 1910 | includecheck: |
436f876c | 1911 | find $(srctree)/* $(RCS_FIND_IGNORE) \ |
1da177e4 | 1912 | -name '*.[hcS]' -type f -print | sort \ |
80007434 | 1913 | | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl |
1da177e4 LT |
1914 | |
1915 | versioncheck: | |
2ee2d292 | 1916 | find $(srctree)/* $(RCS_FIND_IGNORE) \ |
1da177e4 | 1917 | -name '*.[hcS]' -type f -print | sort \ |
80007434 | 1918 | | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl |
1da177e4 | 1919 | |
74425eee | 1920 | coccicheck: |
858805b3 | 1921 | $(Q)$(BASH) $(srctree)/scripts/$@ |
74425eee | 1922 | |
295ac051 AB |
1923 | export_report: |
1924 | $(PERL) $(srctree)/scripts/export_report.pl | |
1925 | ||
c398ff00 | 1926 | PHONY += checkstack kernelrelease kernelversion image_name |
e3ccf6e3 | 1927 | |
011e3a9a JD |
1928 | # UML needs a little special treatment here. It wants to use the host |
1929 | # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone | |
1930 | # else wants $(ARCH), including people doing cross-builds, which means | |
1931 | # that $(SUBARCH) doesn't work here. | |
1932 | ifeq ($(ARCH), um) | |
1933 | CHECKSTACK_ARCH := $(SUBARCH) | |
1934 | else | |
1935 | CHECKSTACK_ARCH := $(ARCH) | |
1936 | endif | |
1da177e4 LT |
1937 | checkstack: |
1938 | $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ | |
75dd4747 | 1939 | $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) |
1da177e4 | 1940 | |
7b8ea53d AW |
1941 | kernelrelease: |
1942 | @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" | |
01ab1788 | 1943 | |
cb58455c | 1944 | kernelversion: |
2244cbd8 | 1945 | @echo $(KERNELVERSION) |
1da177e4 | 1946 | |
c398ff00 MM |
1947 | image_name: |
1948 | @echo $(KBUILD_IMAGE) | |
1949 | ||
1da177e4 | 1950 | quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) |
0663c68c | 1951 | cmd_rmfiles = rm -rf $(rm-files) |
1da177e4 | 1952 | |
392885ee MY |
1953 | # read saved command lines for existing targets |
1954 | existing-targets := $(wildcard $(sort $(targets))) | |
1da177e4 | 1955 | |
b999923c | 1956 | -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) |
1da177e4 | 1957 | |
46b7c492 | 1958 | endif # config-build |
2042b548 MY |
1959 | endif # mixed-build |
1960 | endif # need-sub-make | |
1da177e4 | 1961 | |
4f193362 | 1962 | PHONY += FORCE |
1da177e4 | 1963 | FORCE: |
4f193362 | 1964 | |
bd412d81 | 1965 | # Declare the contents of the PHONY variable as phony. We keep that |
fe8d0a41 | 1966 | # information in a variable so we can use it in if_changed and friends. |
4f193362 | 1967 | .PHONY: $(PHONY) |