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1 | # SPDX-License-Identifier: GPL-2.0 | |
2 | VERSION = 4 | |
3 | PATCHLEVEL = 16 | |
4 | SUBLEVEL = 0 | |
5 | EXTRAVERSION = | |
6 | NAME = Fearless Coyote | |
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 | ||
14 | # That's our default target when none is given on the command line | |
15 | PHONY := _all | |
16 | _all: | |
17 | ||
18 | # o Do not use make's built-in rules and variables | |
19 | # (this increases performance and avoids hard-to-debug behaviour); | |
20 | # o Look for make include files relative to root of kernel src | |
21 | MAKEFLAGS += -rR --include-dir=$(CURDIR) | |
22 | ||
23 | # Avoid funny character set dependencies | |
24 | unexport LC_ALL | |
25 | LC_COLLATE=C | |
26 | LC_NUMERIC=C | |
27 | export LC_COLLATE LC_NUMERIC | |
28 | ||
29 | # Avoid interference with shell env settings | |
30 | unexport GREP_OPTIONS | |
31 | ||
32 | # We are using a recursive build, so we need to do a little thinking | |
33 | # to get the ordering right. | |
34 | # | |
35 | # Most importantly: sub-Makefiles should only ever modify files in | |
36 | # their own directory. If in some directory we have a dependency on | |
37 | # a file in another dir (which doesn't happen often, but it's often | |
38 | # unavoidable when linking the built-in.a targets which finally | |
39 | # turn into vmlinux), we will call a sub make in that other dir, and | |
40 | # after that we are sure that everything which is in that other dir | |
41 | # is now up to date. | |
42 | # | |
43 | # The only cases where we need to modify files which have global | |
44 | # effects are thus separated out and done before the recursive | |
45 | # descending is started. They are now explicitly listed as the | |
46 | # prepare rule. | |
47 | ||
48 | # Beautify output | |
49 | # --------------------------------------------------------------------------- | |
50 | # | |
51 | # Normally, we echo the whole command before executing it. By making | |
52 | # that echo $($(quiet)$(cmd)), we now have the possibility to set | |
53 | # $(quiet) to choose other forms of output instead, e.g. | |
54 | # | |
55 | # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ | |
56 | # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< | |
57 | # | |
58 | # If $(quiet) is empty, the whole command will be printed. | |
59 | # If it is set to "quiet_", only the short version will be printed. | |
60 | # If it is set to "silent_", nothing will be printed at all, since | |
61 | # the variable $(silent_cmd_cc_o_c) doesn't exist. | |
62 | # | |
63 | # A simple variant is to prefix commands with $(Q) - that's useful | |
64 | # for commands that shall be hidden in non-verbose mode. | |
65 | # | |
66 | # $(Q)ln $@ :< | |
67 | # | |
68 | # If KBUILD_VERBOSE equals 0 then the above command will be hidden. | |
69 | # If KBUILD_VERBOSE equals 1 then the above command is displayed. | |
70 | # | |
71 | # To put more focus on warnings, be less verbose as default | |
72 | # Use 'make V=1' to see the full commands | |
73 | ||
74 | ifeq ("$(origin V)", "command line") | |
75 | KBUILD_VERBOSE = $(V) | |
76 | endif | |
77 | ifndef KBUILD_VERBOSE | |
78 | KBUILD_VERBOSE = 0 | |
79 | endif | |
80 | ||
81 | ifeq ($(KBUILD_VERBOSE),1) | |
82 | quiet = | |
83 | Q = | |
84 | else | |
85 | quiet=quiet_ | |
86 | Q = @ | |
87 | endif | |
88 | ||
89 | # If the user is running make -s (silent mode), suppress echoing of | |
90 | # commands | |
91 | ||
92 | ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) | |
93 | quiet=silent_ | |
94 | tools_silent=s | |
95 | endif | |
96 | ||
97 | export quiet Q KBUILD_VERBOSE | |
98 | ||
99 | # kbuild supports saving output files in a separate directory. | |
100 | # To locate output files in a separate directory two syntaxes are supported. | |
101 | # In both cases the working directory must be the root of the kernel src. | |
102 | # 1) O= | |
103 | # Use "make O=dir/to/store/output/files/" | |
104 | # | |
105 | # 2) Set KBUILD_OUTPUT | |
106 | # Set the environment variable KBUILD_OUTPUT to point to the directory | |
107 | # where the output files shall be placed. | |
108 | # export KBUILD_OUTPUT=dir/to/store/output/files/ | |
109 | # make | |
110 | # | |
111 | # The O= assignment takes precedence over the KBUILD_OUTPUT environment | |
112 | # variable. | |
113 | ||
114 | # KBUILD_SRC is not intended to be used by the regular user (for now), | |
115 | # it is set on invocation of make with KBUILD_OUTPUT or O= specified. | |
116 | ifeq ($(KBUILD_SRC),) | |
117 | ||
118 | # OK, Make called in directory where kernel src resides | |
119 | # Do we want to locate output files in a separate directory? | |
120 | ifeq ("$(origin O)", "command line") | |
121 | KBUILD_OUTPUT := $(O) | |
122 | endif | |
123 | ||
124 | # Cancel implicit rules on top Makefile | |
125 | $(CURDIR)/Makefile Makefile: ; | |
126 | ||
127 | ifneq ($(words $(subst :, ,$(CURDIR))), 1) | |
128 | $(error main directory cannot contain spaces nor colons) | |
129 | endif | |
130 | ||
131 | ifneq ($(KBUILD_OUTPUT),) | |
132 | # check that the output directory actually exists | |
133 | saved-output := $(KBUILD_OUTPUT) | |
134 | KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \ | |
135 | && pwd) | |
136 | $(if $(KBUILD_OUTPUT),, \ | |
137 | $(error failed to create output directory "$(saved-output)")) | |
138 | ||
139 | PHONY += $(MAKECMDGOALS) sub-make | |
140 | ||
141 | $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make | |
142 | @: | |
143 | ||
144 | # Invoke a second make in the output directory, passing relevant variables | |
145 | sub-make: | |
146 | $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \ | |
147 | -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS)) | |
148 | ||
149 | # Leave processing to above invocation of make | |
150 | skip-makefile := 1 | |
151 | endif # ifneq ($(KBUILD_OUTPUT),) | |
152 | endif # ifeq ($(KBUILD_SRC),) | |
153 | ||
154 | # We process the rest of the Makefile if this is the final invocation of make | |
155 | ifeq ($(skip-makefile),) | |
156 | ||
157 | # Do not print "Entering directory ...", | |
158 | # but we want to display it when entering to the output directory | |
159 | # so that IDEs/editors are able to understand relative filenames. | |
160 | MAKEFLAGS += --no-print-directory | |
161 | ||
162 | # Call a source code checker (by default, "sparse") as part of the | |
163 | # C compilation. | |
164 | # | |
165 | # Use 'make C=1' to enable checking of only re-compiled files. | |
166 | # Use 'make C=2' to enable checking of *all* source files, regardless | |
167 | # of whether they are re-compiled or not. | |
168 | # | |
169 | # See the file "Documentation/dev-tools/sparse.rst" for more details, | |
170 | # including where to get the "sparse" utility. | |
171 | ||
172 | ifeq ("$(origin C)", "command line") | |
173 | KBUILD_CHECKSRC = $(C) | |
174 | endif | |
175 | ifndef KBUILD_CHECKSRC | |
176 | KBUILD_CHECKSRC = 0 | |
177 | endif | |
178 | ||
179 | # Use make M=dir to specify directory of external module to build | |
180 | # Old syntax make ... SUBDIRS=$PWD is still supported | |
181 | # Setting the environment variable KBUILD_EXTMOD take precedence | |
182 | ifdef SUBDIRS | |
183 | KBUILD_EXTMOD ?= $(SUBDIRS) | |
184 | endif | |
185 | ||
186 | ifeq ("$(origin M)", "command line") | |
187 | KBUILD_EXTMOD := $(M) | |
188 | endif | |
189 | ||
190 | ifeq ($(KBUILD_SRC),) | |
191 | # building in the source tree | |
192 | srctree := . | |
193 | else | |
194 | ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR))) | |
195 | # building in a subdirectory of the source tree | |
196 | srctree := .. | |
197 | else | |
198 | srctree := $(KBUILD_SRC) | |
199 | endif | |
200 | endif | |
201 | ||
202 | export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC | |
203 | ||
204 | objtree := . | |
205 | src := $(srctree) | |
206 | obj := $(objtree) | |
207 | ||
208 | VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD)) | |
209 | ||
210 | export srctree objtree VPATH | |
211 | ||
212 | # To make sure we do not include .config for any of the *config targets | |
213 | # catch them early, and hand them over to scripts/kconfig/Makefile | |
214 | # It is allowed to specify more targets when calling make, including | |
215 | # mixing *config targets and build targets. | |
216 | # For example 'make oldconfig all'. | |
217 | # Detect when mixed targets is specified, and make a second invocation | |
218 | # of make so .config is not included in this case either (for *config). | |
219 | ||
220 | version_h := include/generated/uapi/linux/version.h | |
221 | old_version_h := include/linux/version.h | |
222 | ||
223 | clean-targets := %clean mrproper cleandocs | |
224 | no-dot-config-targets := $(clean-targets) \ | |
225 | cscope gtags TAGS tags help% %docs check% coccicheck \ | |
226 | $(version_h) headers_% archheaders archscripts \ | |
227 | kernelversion %src-pkg | |
228 | ||
229 | config-targets := 0 | |
230 | mixed-targets := 0 | |
231 | dot-config := 1 | |
232 | ||
233 | ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) | |
234 | ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) | |
235 | dot-config := 0 | |
236 | endif | |
237 | endif | |
238 | ||
239 | ifeq ($(KBUILD_EXTMOD),) | |
240 | ifneq ($(filter config %config,$(MAKECMDGOALS)),) | |
241 | config-targets := 1 | |
242 | ifneq ($(words $(MAKECMDGOALS)),1) | |
243 | mixed-targets := 1 | |
244 | endif | |
245 | endif | |
246 | endif | |
247 | ||
248 | # For "make -j clean all", "make -j mrproper defconfig all", etc. | |
249 | ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) | |
250 | ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) | |
251 | mixed-targets := 1 | |
252 | endif | |
253 | endif | |
254 | ||
255 | # install and modules_install need also be processed one by one | |
256 | ifneq ($(filter install,$(MAKECMDGOALS)),) | |
257 | ifneq ($(filter modules_install,$(MAKECMDGOALS)),) | |
258 | mixed-targets := 1 | |
259 | endif | |
260 | endif | |
261 | ||
262 | ifeq ($(mixed-targets),1) | |
263 | # =========================================================================== | |
264 | # We're called with mixed targets (*config and build targets). | |
265 | # Handle them one by one. | |
266 | ||
267 | PHONY += $(MAKECMDGOALS) __build_one_by_one | |
268 | ||
269 | $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one | |
270 | @: | |
271 | ||
272 | __build_one_by_one: | |
273 | $(Q)set -e; \ | |
274 | for i in $(MAKECMDGOALS); do \ | |
275 | $(MAKE) -f $(srctree)/Makefile $$i; \ | |
276 | done | |
277 | ||
278 | else | |
279 | ||
280 | # We need some generic definitions (do not try to remake the file). | |
281 | scripts/Kbuild.include: ; | |
282 | include scripts/Kbuild.include | |
283 | ||
284 | # Read KERNELRELEASE from include/config/kernel.release (if it exists) | |
285 | KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) | |
286 | KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) | |
287 | export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION | |
288 | ||
289 | # SUBARCH tells the usermode build what the underlying arch is. That is set | |
290 | # first, and if a usermode build is happening, the "ARCH=um" on the command | |
291 | # line overrides the setting of ARCH below. If a native build is happening, | |
292 | # then ARCH is assigned, getting whatever value it gets normally, and | |
293 | # SUBARCH is subsequently ignored. | |
294 | ||
295 | SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \ | |
296 | -e s/sun4u/sparc64/ \ | |
297 | -e s/arm.*/arm/ -e s/sa110/arm/ \ | |
298 | -e s/s390x/s390/ -e s/parisc64/parisc/ \ | |
299 | -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \ | |
300 | -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \ | |
301 | -e s/riscv.*/riscv/) | |
302 | ||
303 | # Cross compiling and selecting different set of gcc/bin-utils | |
304 | # --------------------------------------------------------------------------- | |
305 | # | |
306 | # When performing cross compilation for other architectures ARCH shall be set | |
307 | # to the target architecture. (See arch/* for the possibilities). | |
308 | # ARCH can be set during invocation of make: | |
309 | # make ARCH=ia64 | |
310 | # Another way is to have ARCH set in the environment. | |
311 | # The default ARCH is the host where make is executed. | |
312 | ||
313 | # CROSS_COMPILE specify the prefix used for all executables used | |
314 | # during compilation. Only gcc and related bin-utils executables | |
315 | # are prefixed with $(CROSS_COMPILE). | |
316 | # CROSS_COMPILE can be set on the command line | |
317 | # make CROSS_COMPILE=ia64-linux- | |
318 | # Alternatively CROSS_COMPILE can be set in the environment. | |
319 | # A third alternative is to store a setting in .config so that plain | |
320 | # "make" in the configured kernel build directory always uses that. | |
321 | # Default value for CROSS_COMPILE is not to prefix executables | |
322 | # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile | |
323 | ARCH ?= $(SUBARCH) | |
324 | CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%) | |
325 | ||
326 | # Architecture as present in compile.h | |
327 | UTS_MACHINE := $(ARCH) | |
328 | SRCARCH := $(ARCH) | |
329 | ||
330 | # Additional ARCH settings for x86 | |
331 | ifeq ($(ARCH),i386) | |
332 | SRCARCH := x86 | |
333 | endif | |
334 | ifeq ($(ARCH),x86_64) | |
335 | SRCARCH := x86 | |
336 | endif | |
337 | ||
338 | # Additional ARCH settings for sparc | |
339 | ifeq ($(ARCH),sparc32) | |
340 | SRCARCH := sparc | |
341 | endif | |
342 | ifeq ($(ARCH),sparc64) | |
343 | SRCARCH := sparc | |
344 | endif | |
345 | ||
346 | # Additional ARCH settings for sh | |
347 | ifeq ($(ARCH),sh64) | |
348 | SRCARCH := sh | |
349 | endif | |
350 | ||
351 | KCONFIG_CONFIG ?= .config | |
352 | export KCONFIG_CONFIG | |
353 | ||
354 | # SHELL used by kbuild | |
355 | CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ | |
356 | else if [ -x /bin/bash ]; then echo /bin/bash; \ | |
357 | else echo sh; fi ; fi) | |
358 | ||
359 | HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS) | |
360 | HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS) | |
361 | HOST_LFS_LIBS := $(shell getconf LFS_LIBS) | |
362 | ||
363 | HOSTCC = gcc | |
364 | HOSTCXX = g++ | |
365 | HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \ | |
366 | -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) | |
367 | HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) | |
368 | HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) | |
369 | HOST_LOADLIBES := $(HOST_LFS_LIBS) | |
370 | ||
371 | # Make variables (CC, etc...) | |
372 | AS = $(CROSS_COMPILE)as | |
373 | LD = $(CROSS_COMPILE)ld | |
374 | CC = $(CROSS_COMPILE)gcc | |
375 | CPP = $(CC) -E | |
376 | AR = $(CROSS_COMPILE)ar | |
377 | NM = $(CROSS_COMPILE)nm | |
378 | STRIP = $(CROSS_COMPILE)strip | |
379 | OBJCOPY = $(CROSS_COMPILE)objcopy | |
380 | OBJDUMP = $(CROSS_COMPILE)objdump | |
381 | LEX = flex | |
382 | YACC = bison | |
383 | AWK = awk | |
384 | GENKSYMS = scripts/genksyms/genksyms | |
385 | INSTALLKERNEL := installkernel | |
386 | DEPMOD = /sbin/depmod | |
387 | PERL = perl | |
388 | PYTHON = python | |
389 | PYTHON2 = python2 | |
390 | PYTHON3 = python3 | |
391 | CHECK = sparse | |
392 | ||
393 | CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ | |
394 | -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) | |
395 | NOSTDINC_FLAGS = | |
396 | CFLAGS_MODULE = | |
397 | AFLAGS_MODULE = | |
398 | LDFLAGS_MODULE = | |
399 | CFLAGS_KERNEL = | |
400 | AFLAGS_KERNEL = | |
401 | LDFLAGS_vmlinux = | |
402 | ||
403 | # Use USERINCLUDE when you must reference the UAPI directories only. | |
404 | USERINCLUDE := \ | |
405 | -I$(srctree)/arch/$(SRCARCH)/include/uapi \ | |
406 | -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ | |
407 | -I$(srctree)/include/uapi \ | |
408 | -I$(objtree)/include/generated/uapi \ | |
409 | -include $(srctree)/include/linux/kconfig.h | |
410 | ||
411 | # Use LINUXINCLUDE when you must reference the include/ directory. | |
412 | # Needed to be compatible with the O= option | |
413 | LINUXINCLUDE := \ | |
414 | -I$(srctree)/arch/$(SRCARCH)/include \ | |
415 | -I$(objtree)/arch/$(SRCARCH)/include/generated \ | |
416 | $(if $(KBUILD_SRC), -I$(srctree)/include) \ | |
417 | -I$(objtree)/include \ | |
418 | $(USERINCLUDE) | |
419 | ||
420 | KBUILD_AFLAGS := -D__ASSEMBLY__ | |
421 | KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ | |
422 | -fno-strict-aliasing -fno-common -fshort-wchar \ | |
423 | -Werror-implicit-function-declaration \ | |
424 | -Wno-format-security \ | |
425 | -std=gnu89 | |
426 | KBUILD_CPPFLAGS := -D__KERNEL__ | |
427 | KBUILD_AFLAGS_KERNEL := | |
428 | KBUILD_CFLAGS_KERNEL := | |
429 | KBUILD_AFLAGS_MODULE := -DMODULE | |
430 | KBUILD_CFLAGS_MODULE := -DMODULE | |
431 | KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds | |
432 | LDFLAGS := | |
433 | GCC_PLUGINS_CFLAGS := | |
434 | ||
435 | export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC | |
436 | export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES | |
437 | export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE | |
438 | export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS | |
439 | ||
440 | export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS | |
441 | export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE | |
442 | export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN | |
443 | export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE | |
444 | export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE | |
445 | export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL | |
446 | export KBUILD_ARFLAGS | |
447 | ||
448 | # When compiling out-of-tree modules, put MODVERDIR in the module | |
449 | # tree rather than in the kernel tree. The kernel tree might | |
450 | # even be read-only. | |
451 | export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions | |
452 | ||
453 | # Files to ignore in find ... statements | |
454 | ||
455 | export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ | |
456 | -name CVS -o -name .pc -o -name .hg -o -name .git \) \ | |
457 | -prune -o | |
458 | export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ | |
459 | --exclude CVS --exclude .pc --exclude .hg --exclude .git | |
460 | ||
461 | # =========================================================================== | |
462 | # Rules shared between *config targets and build targets | |
463 | ||
464 | # Basic helpers built in scripts/basic/ | |
465 | PHONY += scripts_basic | |
466 | scripts_basic: | |
467 | $(Q)$(MAKE) $(build)=scripts/basic | |
468 | $(Q)rm -f .tmp_quiet_recordmcount | |
469 | ||
470 | # To avoid any implicit rule to kick in, define an empty command. | |
471 | scripts/basic/%: scripts_basic ; | |
472 | ||
473 | PHONY += outputmakefile | |
474 | # outputmakefile generates a Makefile in the output directory, if using a | |
475 | # separate output directory. This allows convenient use of make in the | |
476 | # output directory. | |
477 | outputmakefile: | |
478 | ifneq ($(KBUILD_SRC),) | |
479 | $(Q)ln -fsn $(srctree) source | |
480 | $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ | |
481 | $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) | |
482 | endif | |
483 | ||
484 | ifeq ($(cc-name),clang) | |
485 | ifneq ($(CROSS_COMPILE),) | |
486 | CLANG_TARGET := --target=$(notdir $(CROSS_COMPILE:%-=%)) | |
487 | GCC_TOOLCHAIN := $(realpath $(dir $(shell which $(LD)))/..) | |
488 | endif | |
489 | ifneq ($(GCC_TOOLCHAIN),) | |
490 | CLANG_GCC_TC := --gcc-toolchain=$(GCC_TOOLCHAIN) | |
491 | endif | |
492 | KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) | |
493 | KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) | |
494 | KBUILD_CFLAGS += $(call cc-option, -no-integrated-as) | |
495 | KBUILD_AFLAGS += $(call cc-option, -no-integrated-as) | |
496 | endif | |
497 | ||
498 | RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register | |
499 | RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk | |
500 | RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) | |
501 | export RETPOLINE_CFLAGS | |
502 | ||
503 | # check for 'asm goto' | |
504 | ifeq ($(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y) | |
505 | CC_HAVE_ASM_GOTO := 1 | |
506 | KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO | |
507 | KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO | |
508 | endif | |
509 | ||
510 | ifeq ($(config-targets),1) | |
511 | # =========================================================================== | |
512 | # *config targets only - make sure prerequisites are updated, and descend | |
513 | # in scripts/kconfig to make the *config target | |
514 | ||
515 | # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. | |
516 | # KBUILD_DEFCONFIG may point out an alternative default configuration | |
517 | # used for 'make defconfig' | |
518 | include arch/$(SRCARCH)/Makefile | |
519 | export KBUILD_DEFCONFIG KBUILD_KCONFIG | |
520 | ||
521 | config: scripts_basic outputmakefile FORCE | |
522 | $(Q)$(MAKE) $(build)=scripts/kconfig $@ | |
523 | ||
524 | %config: scripts_basic outputmakefile FORCE | |
525 | $(Q)$(MAKE) $(build)=scripts/kconfig $@ | |
526 | ||
527 | else | |
528 | # =========================================================================== | |
529 | # Build targets only - this includes vmlinux, arch specific targets, clean | |
530 | # targets and others. In general all targets except *config targets. | |
531 | ||
532 | # If building an external module we do not care about the all: rule | |
533 | # but instead _all depend on modules | |
534 | PHONY += all | |
535 | ifeq ($(KBUILD_EXTMOD),) | |
536 | _all: all | |
537 | else | |
538 | _all: modules | |
539 | endif | |
540 | ||
541 | # Decide whether to build built-in, modular, or both. | |
542 | # Normally, just do built-in. | |
543 | ||
544 | KBUILD_MODULES := | |
545 | KBUILD_BUILTIN := 1 | |
546 | ||
547 | # If we have only "make modules", don't compile built-in objects. | |
548 | # When we're building modules with modversions, we need to consider | |
549 | # the built-in objects during the descend as well, in order to | |
550 | # make sure the checksums are up to date before we record them. | |
551 | ||
552 | ifeq ($(MAKECMDGOALS),modules) | |
553 | KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) | |
554 | endif | |
555 | ||
556 | # If we have "make <whatever> modules", compile modules | |
557 | # in addition to whatever we do anyway. | |
558 | # Just "make" or "make all" shall build modules as well | |
559 | ||
560 | ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) | |
561 | KBUILD_MODULES := 1 | |
562 | endif | |
563 | ||
564 | ifeq ($(MAKECMDGOALS),) | |
565 | KBUILD_MODULES := 1 | |
566 | endif | |
567 | ||
568 | export KBUILD_MODULES KBUILD_BUILTIN | |
569 | ||
570 | ifeq ($(KBUILD_EXTMOD),) | |
571 | # Objects we will link into vmlinux / subdirs we need to visit | |
572 | init-y := init/ | |
573 | drivers-y := drivers/ sound/ firmware/ | |
574 | net-y := net/ | |
575 | libs-y := lib/ | |
576 | core-y := usr/ | |
577 | virt-y := virt/ | |
578 | endif # KBUILD_EXTMOD | |
579 | ||
580 | ifeq ($(dot-config),1) | |
581 | # Read in config | |
582 | -include include/config/auto.conf | |
583 | ||
584 | ifeq ($(KBUILD_EXTMOD),) | |
585 | # Read in dependencies to all Kconfig* files, make sure to run | |
586 | # oldconfig if changes are detected. | |
587 | -include include/config/auto.conf.cmd | |
588 | ||
589 | # To avoid any implicit rule to kick in, define an empty command | |
590 | $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; | |
591 | ||
592 | # The actual configuration files used during the build are stored in | |
593 | # include/generated/ and include/config/. Update them if .config is newer than | |
594 | # include/config/auto.conf (which mirrors .config). | |
595 | include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd | |
596 | $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig | |
597 | else | |
598 | # external modules needs include/generated/autoconf.h and include/config/auto.conf | |
599 | # but do not care if they are up-to-date. Use auto.conf to trigger the test | |
600 | PHONY += include/config/auto.conf | |
601 | ||
602 | include/config/auto.conf: | |
603 | $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ | |
604 | echo >&2; \ | |
605 | echo >&2 " ERROR: Kernel configuration is invalid."; \ | |
606 | echo >&2 " include/generated/autoconf.h or $@ are missing.";\ | |
607 | echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ | |
608 | echo >&2 ; \ | |
609 | /bin/false) | |
610 | ||
611 | endif # KBUILD_EXTMOD | |
612 | ||
613 | else | |
614 | # Dummy target needed, because used as prerequisite | |
615 | include/config/auto.conf: ; | |
616 | endif # $(dot-config) | |
617 | ||
618 | # The all: target is the default when no target is given on the | |
619 | # command line. | |
620 | # This allow a user to issue only 'make' to build a kernel including modules | |
621 | # Defaults to vmlinux, but the arch makefile usually adds further targets | |
622 | all: vmlinux | |
623 | ||
624 | KBUILD_CFLAGS += $(call cc-option,-fno-PIE) | |
625 | KBUILD_AFLAGS += $(call cc-option,-fno-PIE) | |
626 | CFLAGS_GCOV := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,) | |
627 | export CFLAGS_GCOV CFLAGS_KCOV | |
628 | ||
629 | # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default | |
630 | # values of the respective KBUILD_* variables | |
631 | ARCH_CPPFLAGS := | |
632 | ARCH_AFLAGS := | |
633 | ARCH_CFLAGS := | |
634 | include arch/$(SRCARCH)/Makefile | |
635 | ||
636 | KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) | |
637 | KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) | |
638 | KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) | |
639 | KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) | |
640 | KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context) | |
641 | ||
642 | ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE | |
643 | KBUILD_CFLAGS += $(call cc-option,-Oz,-Os) | |
644 | KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,) | |
645 | else | |
646 | ifdef CONFIG_PROFILE_ALL_BRANCHES | |
647 | KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,) | |
648 | else | |
649 | KBUILD_CFLAGS += -O2 | |
650 | endif | |
651 | endif | |
652 | ||
653 | KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \ | |
654 | $(call cc-disable-warning,maybe-uninitialized,)) | |
655 | ||
656 | # Tell gcc to never replace conditional load with a non-conditional one | |
657 | KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) | |
658 | ||
659 | include scripts/Makefile.kcov | |
660 | include scripts/Makefile.gcc-plugins | |
661 | ||
662 | ifdef CONFIG_READABLE_ASM | |
663 | # Disable optimizations that make assembler listings hard to read. | |
664 | # reorder blocks reorders the control in the function | |
665 | # ipa clone creates specialized cloned functions | |
666 | # partial inlining inlines only parts of functions | |
667 | KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ | |
668 | $(call cc-option,-fno-ipa-cp-clone,) \ | |
669 | $(call cc-option,-fno-partial-inlining) | |
670 | endif | |
671 | ||
672 | ifneq ($(CONFIG_FRAME_WARN),0) | |
673 | KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) | |
674 | endif | |
675 | ||
676 | # This selects the stack protector compiler flag. Testing it is delayed | |
677 | # until after .config has been reprocessed, in the prepare-compiler-check | |
678 | # target. | |
679 | ifdef CONFIG_CC_STACKPROTECTOR_AUTO | |
680 | stackp-flag := $(call cc-option,-fstack-protector-strong,$(call cc-option,-fstack-protector)) | |
681 | stackp-name := AUTO | |
682 | else | |
683 | ifdef CONFIG_CC_STACKPROTECTOR_REGULAR | |
684 | stackp-flag := -fstack-protector | |
685 | stackp-name := REGULAR | |
686 | else | |
687 | ifdef CONFIG_CC_STACKPROTECTOR_STRONG | |
688 | stackp-flag := -fstack-protector-strong | |
689 | stackp-name := STRONG | |
690 | else | |
691 | # If either there is no stack protector for this architecture or | |
692 | # CONFIG_CC_STACKPROTECTOR_NONE is selected, we're done, and $(stackp-name) | |
693 | # is empty, skipping all remaining stack protector tests. | |
694 | # | |
695 | # Force off for distro compilers that enable stack protector by default. | |
696 | KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector) | |
697 | endif | |
698 | endif | |
699 | endif | |
700 | # Find arch-specific stack protector compiler sanity-checking script. | |
701 | ifdef stackp-name | |
702 | ifneq ($(stackp-flag),) | |
703 | stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh | |
704 | stackp-check := $(wildcard $(stackp-path)) | |
705 | # If the wildcard test matches a test script, run it to check functionality. | |
706 | ifdef stackp-check | |
707 | ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y) | |
708 | stackp-broken := y | |
709 | endif | |
710 | endif | |
711 | ifndef stackp-broken | |
712 | # If the stack protector is functional, enable code that depends on it. | |
713 | KBUILD_CPPFLAGS += -DCONFIG_CC_STACKPROTECTOR | |
714 | # Either we've already detected the flag (for AUTO) or we'll fail the | |
715 | # build in the prepare-compiler-check rule (for specific flag). | |
716 | KBUILD_CFLAGS += $(stackp-flag) | |
717 | else | |
718 | # We have to make sure stack protector is unconditionally disabled if | |
719 | # the compiler is broken (in case we're going to continue the build in | |
720 | # AUTO mode). | |
721 | KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector) | |
722 | endif | |
723 | endif | |
724 | endif | |
725 | ||
726 | ifeq ($(cc-name),clang) | |
727 | KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) | |
728 | KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) | |
729 | KBUILD_CFLAGS += $(call cc-disable-warning, gnu) | |
730 | KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) | |
731 | # Quiet clang warning: comparison of unsigned expression < 0 is always false | |
732 | KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) | |
733 | # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the | |
734 | # source of a reference will be _MergedGlobals and not on of the whitelisted names. | |
735 | # See modpost pattern 2 | |
736 | KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) | |
737 | KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) | |
738 | else | |
739 | ||
740 | # These warnings generated too much noise in a regular build. | |
741 | # Use make W=1 to enable them (see scripts/Makefile.extrawarn) | |
742 | KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) | |
743 | endif | |
744 | ||
745 | KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) | |
746 | ifdef CONFIG_FRAME_POINTER | |
747 | KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls | |
748 | else | |
749 | # Some targets (ARM with Thumb2, for example), can't be built with frame | |
750 | # pointers. For those, we don't have FUNCTION_TRACER automatically | |
751 | # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is | |
752 | # incompatible with -fomit-frame-pointer with current GCC, so we don't use | |
753 | # -fomit-frame-pointer with FUNCTION_TRACER. | |
754 | ifndef CONFIG_FUNCTION_TRACER | |
755 | KBUILD_CFLAGS += -fomit-frame-pointer | |
756 | endif | |
757 | endif | |
758 | ||
759 | KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) | |
760 | ||
761 | ifdef CONFIG_DEBUG_INFO | |
762 | ifdef CONFIG_DEBUG_INFO_SPLIT | |
763 | KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) | |
764 | else | |
765 | KBUILD_CFLAGS += -g | |
766 | endif | |
767 | KBUILD_AFLAGS += -Wa,-gdwarf-2 | |
768 | endif | |
769 | ifdef CONFIG_DEBUG_INFO_DWARF4 | |
770 | KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) | |
771 | endif | |
772 | ||
773 | ifdef CONFIG_DEBUG_INFO_REDUCED | |
774 | KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ | |
775 | $(call cc-option,-fno-var-tracking) | |
776 | endif | |
777 | ||
778 | ifdef CONFIG_FUNCTION_TRACER | |
779 | ifndef CC_FLAGS_FTRACE | |
780 | CC_FLAGS_FTRACE := -pg | |
781 | endif | |
782 | export CC_FLAGS_FTRACE | |
783 | ifdef CONFIG_HAVE_FENTRY | |
784 | CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) | |
785 | endif | |
786 | KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY) | |
787 | KBUILD_AFLAGS += $(CC_USING_FENTRY) | |
788 | ifdef CONFIG_DYNAMIC_FTRACE | |
789 | ifdef CONFIG_HAVE_C_RECORDMCOUNT | |
790 | BUILD_C_RECORDMCOUNT := y | |
791 | export BUILD_C_RECORDMCOUNT | |
792 | endif | |
793 | endif | |
794 | endif | |
795 | ||
796 | # We trigger additional mismatches with less inlining | |
797 | ifdef CONFIG_DEBUG_SECTION_MISMATCH | |
798 | KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) | |
799 | endif | |
800 | ||
801 | ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION | |
802 | KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,) | |
803 | KBUILD_CFLAGS += $(call cc-option,-fdata-sections,) | |
804 | endif | |
805 | ||
806 | # arch Makefile may override CC so keep this after arch Makefile is included | |
807 | NOSTDINC_FLAGS += -nostdinc -isystem $(call shell-cached,$(CC) -print-file-name=include) | |
808 | CHECKFLAGS += $(NOSTDINC_FLAGS) | |
809 | ||
810 | # warn about C99 declaration after statement | |
811 | KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) | |
812 | ||
813 | # disable pointer signed / unsigned warnings in gcc 4.0 | |
814 | KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) | |
815 | ||
816 | # disable invalid "can't wrap" optimizations for signed / pointers | |
817 | KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) | |
818 | ||
819 | # clang sets -fmerge-all-constants by default as optimization, but this | |
820 | # is non-conforming behavior for C and in fact breaks the kernel, so we | |
821 | # need to disable it here generally. | |
822 | KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) | |
823 | ||
824 | # for gcc -fno-merge-all-constants disables everything, but it is fine | |
825 | # to have actual conforming behavior enabled. | |
826 | KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) | |
827 | ||
828 | # Make sure -fstack-check isn't enabled (like gentoo apparently did) | |
829 | KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) | |
830 | ||
831 | # conserve stack if available | |
832 | KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) | |
833 | ||
834 | # disallow errors like 'EXPORT_GPL(foo);' with missing header | |
835 | KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) | |
836 | ||
837 | # require functions to have arguments in prototypes, not empty 'int foo()' | |
838 | KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) | |
839 | ||
840 | # Prohibit date/time macros, which would make the build non-deterministic | |
841 | KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) | |
842 | ||
843 | # enforce correct pointer usage | |
844 | KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) | |
845 | ||
846 | # Require designated initializers for all marked structures | |
847 | KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) | |
848 | ||
849 | # use the deterministic mode of AR if available | |
850 | KBUILD_ARFLAGS := $(call ar-option,D) | |
851 | ||
852 | include scripts/Makefile.kasan | |
853 | include scripts/Makefile.extrawarn | |
854 | include scripts/Makefile.ubsan | |
855 | ||
856 | # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the | |
857 | # last assignments | |
858 | KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) | |
859 | KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) | |
860 | KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) | |
861 | ||
862 | # Use --build-id when available. | |
863 | LDFLAGS_BUILD_ID := $(call ld-option, --build-id) | |
864 | KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) | |
865 | LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) | |
866 | ||
867 | ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION | |
868 | LDFLAGS_vmlinux += $(call ld-option, --gc-sections,) | |
869 | endif | |
870 | ||
871 | ifeq ($(CONFIG_STRIP_ASM_SYMS),y) | |
872 | LDFLAGS_vmlinux += $(call ld-option, -X,) | |
873 | endif | |
874 | ||
875 | # Default kernel image to build when no specific target is given. | |
876 | # KBUILD_IMAGE may be overruled on the command line or | |
877 | # set in the environment | |
878 | # Also any assignments in arch/$(ARCH)/Makefile take precedence over | |
879 | # this default value | |
880 | export KBUILD_IMAGE ?= vmlinux | |
881 | ||
882 | # | |
883 | # INSTALL_PATH specifies where to place the updated kernel and system map | |
884 | # images. Default is /boot, but you can set it to other values | |
885 | export INSTALL_PATH ?= /boot | |
886 | ||
887 | # | |
888 | # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. | |
889 | # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as | |
890 | # an argument if needed. Otherwise it defaults to the kernel install path | |
891 | # | |
892 | export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) | |
893 | ||
894 | # | |
895 | # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory | |
896 | # relocations required by build roots. This is not defined in the | |
897 | # makefile but the argument can be passed to make if needed. | |
898 | # | |
899 | ||
900 | MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) | |
901 | export MODLIB | |
902 | ||
903 | # | |
904 | # INSTALL_MOD_STRIP, if defined, will cause modules to be | |
905 | # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then | |
906 | # the default option --strip-debug will be used. Otherwise, | |
907 | # INSTALL_MOD_STRIP value will be used as the options to the strip command. | |
908 | ||
909 | ifdef INSTALL_MOD_STRIP | |
910 | ifeq ($(INSTALL_MOD_STRIP),1) | |
911 | mod_strip_cmd = $(STRIP) --strip-debug | |
912 | else | |
913 | mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) | |
914 | endif # INSTALL_MOD_STRIP=1 | |
915 | else | |
916 | mod_strip_cmd = true | |
917 | endif # INSTALL_MOD_STRIP | |
918 | export mod_strip_cmd | |
919 | ||
920 | # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed | |
921 | # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP | |
922 | # or CONFIG_MODULE_COMPRESS_XZ. | |
923 | ||
924 | mod_compress_cmd = true | |
925 | ifdef CONFIG_MODULE_COMPRESS | |
926 | ifdef CONFIG_MODULE_COMPRESS_GZIP | |
927 | mod_compress_cmd = gzip -n -f | |
928 | endif # CONFIG_MODULE_COMPRESS_GZIP | |
929 | ifdef CONFIG_MODULE_COMPRESS_XZ | |
930 | mod_compress_cmd = xz -f | |
931 | endif # CONFIG_MODULE_COMPRESS_XZ | |
932 | endif # CONFIG_MODULE_COMPRESS | |
933 | export mod_compress_cmd | |
934 | ||
935 | # Select initial ramdisk compression format, default is gzip(1). | |
936 | # This shall be used by the dracut(8) tool while creating an initramfs image. | |
937 | # | |
938 | INITRD_COMPRESS-y := gzip | |
939 | INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 | |
940 | INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma | |
941 | INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz | |
942 | INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo | |
943 | INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 | |
944 | # do not export INITRD_COMPRESS, since we didn't actually | |
945 | # choose a sane default compression above. | |
946 | # export INITRD_COMPRESS := $(INITRD_COMPRESS-y) | |
947 | ||
948 | ifdef CONFIG_MODULE_SIG_ALL | |
949 | $(eval $(call config_filename,MODULE_SIG_KEY)) | |
950 | ||
951 | mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 | |
952 | else | |
953 | mod_sign_cmd = true | |
954 | endif | |
955 | export mod_sign_cmd | |
956 | ||
957 | ifdef CONFIG_STACK_VALIDATION | |
958 | has_libelf := $(call try-run,\ | |
959 | echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0) | |
960 | ifeq ($(has_libelf),1) | |
961 | objtool_target := tools/objtool FORCE | |
962 | else | |
963 | ifdef CONFIG_UNWINDER_ORC | |
964 | $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") | |
965 | else | |
966 | $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") | |
967 | endif | |
968 | SKIP_STACK_VALIDATION := 1 | |
969 | export SKIP_STACK_VALIDATION | |
970 | endif | |
971 | endif | |
972 | ||
973 | ||
974 | ifeq ($(KBUILD_EXTMOD),) | |
975 | core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ | |
976 | ||
977 | vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ | |
978 | $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ | |
979 | $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) | |
980 | ||
981 | vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ | |
982 | $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-)))) | |
983 | ||
984 | init-y := $(patsubst %/, %/built-in.a, $(init-y)) | |
985 | core-y := $(patsubst %/, %/built-in.a, $(core-y)) | |
986 | drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y)) | |
987 | net-y := $(patsubst %/, %/built-in.a, $(net-y)) | |
988 | libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) | |
989 | libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y))) | |
990 | virt-y := $(patsubst %/, %/built-in.a, $(virt-y)) | |
991 | ||
992 | # Externally visible symbols (used by link-vmlinux.sh) | |
993 | export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) | |
994 | export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y) | |
995 | export KBUILD_VMLINUX_LIBS := $(libs-y1) | |
996 | export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds | |
997 | export LDFLAGS_vmlinux | |
998 | # used by scripts/package/Makefile | |
999 | export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) | |
1000 | ||
1001 | vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS) | |
1002 | ||
1003 | # Recurse until adjust_autoksyms.sh is satisfied | |
1004 | PHONY += autoksyms_recursive | |
1005 | autoksyms_recursive: $(vmlinux-deps) | |
1006 | ifdef CONFIG_TRIM_UNUSED_KSYMS | |
1007 | $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ | |
1008 | "$(MAKE) -f $(srctree)/Makefile vmlinux" | |
1009 | endif | |
1010 | ||
1011 | # For the kernel to actually contain only the needed exported symbols, | |
1012 | # we have to build modules as well to determine what those symbols are. | |
1013 | # (this can be evaluated only once include/config/auto.conf has been included) | |
1014 | ifdef CONFIG_TRIM_UNUSED_KSYMS | |
1015 | KBUILD_MODULES := 1 | |
1016 | endif | |
1017 | ||
1018 | autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) | |
1019 | ||
1020 | $(autoksyms_h): | |
1021 | $(Q)mkdir -p $(dir $@) | |
1022 | $(Q)touch $@ | |
1023 | ||
1024 | ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) | |
1025 | ||
1026 | # Final link of vmlinux with optional arch pass after final link | |
1027 | cmd_link-vmlinux = \ | |
1028 | $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ; \ | |
1029 | $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) | |
1030 | ||
1031 | vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE | |
1032 | ifdef CONFIG_HEADERS_CHECK | |
1033 | $(Q)$(MAKE) -f $(srctree)/Makefile headers_check | |
1034 | endif | |
1035 | ifdef CONFIG_GDB_SCRIPTS | |
1036 | $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) | |
1037 | endif | |
1038 | +$(call if_changed,link-vmlinux) | |
1039 | ||
1040 | # Build samples along the rest of the kernel | |
1041 | ifdef CONFIG_SAMPLES | |
1042 | vmlinux-dirs += samples | |
1043 | endif | |
1044 | ||
1045 | # The actual objects are generated when descending, | |
1046 | # make sure no implicit rule kicks in | |
1047 | $(sort $(vmlinux-deps)): $(vmlinux-dirs) ; | |
1048 | ||
1049 | # Handle descending into subdirectories listed in $(vmlinux-dirs) | |
1050 | # Preset locale variables to speed up the build process. Limit locale | |
1051 | # tweaks to this spot to avoid wrong language settings when running | |
1052 | # make menuconfig etc. | |
1053 | # Error messages still appears in the original language | |
1054 | ||
1055 | PHONY += $(vmlinux-dirs) | |
1056 | $(vmlinux-dirs): prepare scripts | |
1057 | $(Q)$(MAKE) $(build)=$@ need-builtin=1 | |
1058 | ||
1059 | define filechk_kernel.release | |
1060 | echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" | |
1061 | endef | |
1062 | ||
1063 | # Store (new) KERNELRELEASE string in include/config/kernel.release | |
1064 | include/config/kernel.release: include/config/auto.conf FORCE | |
1065 | $(call filechk,kernel.release) | |
1066 | ||
1067 | # Additional helpers built in scripts/ | |
1068 | # Carefully list dependencies so we do not try to build scripts twice | |
1069 | # in parallel | |
1070 | PHONY += scripts | |
1071 | scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \ | |
1072 | asm-generic gcc-plugins $(autoksyms_h) | |
1073 | $(Q)$(MAKE) $(build)=$(@) | |
1074 | ||
1075 | # Things we need to do before we recursively start building the kernel | |
1076 | # or the modules are listed in "prepare". | |
1077 | # A multi level approach is used. prepareN is processed before prepareN-1. | |
1078 | # archprepare is used in arch Makefiles and when processed asm symlink, | |
1079 | # version.h and scripts_basic is processed / created. | |
1080 | ||
1081 | # Listed in dependency order | |
1082 | PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 | |
1083 | ||
1084 | # prepare3 is used to check if we are building in a separate output directory, | |
1085 | # and if so do: | |
1086 | # 1) Check that make has not been executed in the kernel src $(srctree) | |
1087 | prepare3: include/config/kernel.release | |
1088 | ifneq ($(KBUILD_SRC),) | |
1089 | @$(kecho) ' Using $(srctree) as source for kernel' | |
1090 | $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ | |
1091 | echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ | |
1092 | echo >&2 " in the '$(srctree)' directory.";\ | |
1093 | /bin/false; \ | |
1094 | fi; | |
1095 | endif | |
1096 | ||
1097 | # prepare2 creates a makefile if using a separate output directory. | |
1098 | # From this point forward, .config has been reprocessed, so any rules | |
1099 | # that need to depend on updated CONFIG_* values can be checked here. | |
1100 | prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic | |
1101 | ||
1102 | prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ | |
1103 | include/config/auto.conf | |
1104 | $(cmd_crmodverdir) | |
1105 | ||
1106 | archprepare: archheaders archscripts prepare1 scripts_basic | |
1107 | ||
1108 | prepare0: archprepare gcc-plugins | |
1109 | $(Q)$(MAKE) $(build)=. | |
1110 | ||
1111 | # All the preparing.. | |
1112 | prepare: prepare0 prepare-objtool | |
1113 | ||
1114 | # Support for using generic headers in asm-generic | |
1115 | PHONY += asm-generic uapi-asm-generic | |
1116 | asm-generic: uapi-asm-generic | |
1117 | $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ | |
1118 | src=asm obj=arch/$(SRCARCH)/include/generated/asm | |
1119 | uapi-asm-generic: | |
1120 | $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ | |
1121 | src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm | |
1122 | ||
1123 | PHONY += prepare-objtool | |
1124 | prepare-objtool: $(objtool_target) | |
1125 | ||
1126 | # Check for CONFIG flags that require compiler support. Abort the build | |
1127 | # after .config has been processed, but before the kernel build starts. | |
1128 | # | |
1129 | # For security-sensitive CONFIG options, we don't want to fallback and/or | |
1130 | # silently change which compiler flags will be used, since that leads to | |
1131 | # producing kernels with different security feature characteristics | |
1132 | # depending on the compiler used. (For example, "But I selected | |
1133 | # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!") | |
1134 | PHONY += prepare-compiler-check | |
1135 | prepare-compiler-check: FORCE | |
1136 | # Make sure compiler supports requested stack protector flag. | |
1137 | ifdef stackp-name | |
1138 | # Warn about CONFIG_CC_STACKPROTECTOR_AUTO having found no option. | |
1139 | ifeq ($(stackp-flag),) | |
1140 | @echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ | |
1141 | Compiler does not support any known stack-protector >&2 | |
1142 | else | |
1143 | # Fail if specifically requested stack protector is missing. | |
1144 | ifeq ($(call cc-option, $(stackp-flag)),) | |
1145 | @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ | |
1146 | $(stackp-flag) not supported by compiler >&2 && exit 1 | |
1147 | endif | |
1148 | endif | |
1149 | endif | |
1150 | # Make sure compiler does not have buggy stack-protector support. If a | |
1151 | # specific stack-protector was requested, fail the build, otherwise warn. | |
1152 | ifdef stackp-broken | |
1153 | ifeq ($(stackp-name),AUTO) | |
1154 | @echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ | |
1155 | $(stackp-flag) available but compiler is broken: disabling >&2 | |
1156 | else | |
1157 | @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ | |
1158 | $(stackp-flag) available but compiler is broken >&2 && exit 1 | |
1159 | endif | |
1160 | endif | |
1161 | @: | |
1162 | ||
1163 | # Generate some files | |
1164 | # --------------------------------------------------------------------------- | |
1165 | ||
1166 | # KERNELRELEASE can change from a few different places, meaning version.h | |
1167 | # needs to be updated, so this check is forced on all builds | |
1168 | ||
1169 | uts_len := 64 | |
1170 | define filechk_utsrelease.h | |
1171 | if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ | |
1172 | echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ | |
1173 | exit 1; \ | |
1174 | fi; \ | |
1175 | (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) | |
1176 | endef | |
1177 | ||
1178 | define filechk_version.h | |
1179 | (echo \#define LINUX_VERSION_CODE $(shell \ | |
1180 | expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ | |
1181 | echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) | |
1182 | endef | |
1183 | ||
1184 | $(version_h): $(srctree)/Makefile FORCE | |
1185 | $(call filechk,version.h) | |
1186 | $(Q)rm -f $(old_version_h) | |
1187 | ||
1188 | include/generated/utsrelease.h: include/config/kernel.release FORCE | |
1189 | $(call filechk,utsrelease.h) | |
1190 | ||
1191 | PHONY += headerdep | |
1192 | headerdep: | |
1193 | $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ | |
1194 | $(srctree)/scripts/headerdep.pl -I$(srctree)/include | |
1195 | ||
1196 | # --------------------------------------------------------------------------- | |
1197 | # Kernel headers | |
1198 | ||
1199 | #Default location for installed headers | |
1200 | export INSTALL_HDR_PATH = $(objtree)/usr | |
1201 | ||
1202 | # If we do an all arch process set dst to include/arch-$(SRCARCH) | |
1203 | hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include) | |
1204 | ||
1205 | PHONY += archheaders | |
1206 | archheaders: | |
1207 | ||
1208 | PHONY += archscripts | |
1209 | archscripts: | |
1210 | ||
1211 | PHONY += __headers | |
1212 | __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts | |
1213 | $(Q)$(MAKE) $(build)=scripts build_unifdef | |
1214 | ||
1215 | PHONY += headers_install_all | |
1216 | headers_install_all: | |
1217 | $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install | |
1218 | ||
1219 | PHONY += headers_install | |
1220 | headers_install: __headers | |
1221 | $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ | |
1222 | $(error Headers not exportable for the $(SRCARCH) architecture)) | |
1223 | $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include | |
1224 | $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) | |
1225 | ||
1226 | PHONY += headers_check_all | |
1227 | headers_check_all: headers_install_all | |
1228 | $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check | |
1229 | ||
1230 | PHONY += headers_check | |
1231 | headers_check: headers_install | |
1232 | $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1 | |
1233 | $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1 | |
1234 | ||
1235 | # --------------------------------------------------------------------------- | |
1236 | # Kernel selftest | |
1237 | ||
1238 | PHONY += kselftest | |
1239 | kselftest: | |
1240 | $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests | |
1241 | ||
1242 | PHONY += kselftest-clean | |
1243 | kselftest-clean: | |
1244 | $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean | |
1245 | ||
1246 | PHONY += kselftest-merge | |
1247 | kselftest-merge: | |
1248 | $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) | |
1249 | $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \ | |
1250 | -m $(objtree)/.config \ | |
1251 | $(srctree)/tools/testing/selftests/*/config | |
1252 | +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig | |
1253 | ||
1254 | # --------------------------------------------------------------------------- | |
1255 | # Modules | |
1256 | ||
1257 | ifdef CONFIG_MODULES | |
1258 | ||
1259 | # By default, build modules as well | |
1260 | ||
1261 | all: modules | |
1262 | ||
1263 | # Build modules | |
1264 | # | |
1265 | # A module can be listed more than once in obj-m resulting in | |
1266 | # duplicate lines in modules.order files. Those are removed | |
1267 | # using awk while concatenating to the final file. | |
1268 | ||
1269 | PHONY += modules | |
1270 | modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin | |
1271 | $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order | |
1272 | @$(kecho) ' Building modules, stage 2.'; | |
1273 | $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost | |
1274 | ||
1275 | modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) | |
1276 | $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin | |
1277 | ||
1278 | %/modules.builtin: include/config/auto.conf | |
1279 | $(Q)$(MAKE) $(modbuiltin)=$* | |
1280 | ||
1281 | ||
1282 | # Target to prepare building external modules | |
1283 | PHONY += modules_prepare | |
1284 | modules_prepare: prepare scripts | |
1285 | ||
1286 | # Target to install modules | |
1287 | PHONY += modules_install | |
1288 | modules_install: _modinst_ _modinst_post | |
1289 | ||
1290 | PHONY += _modinst_ | |
1291 | _modinst_: | |
1292 | @rm -rf $(MODLIB)/kernel | |
1293 | @rm -f $(MODLIB)/source | |
1294 | @mkdir -p $(MODLIB)/kernel | |
1295 | @ln -s $(abspath $(srctree)) $(MODLIB)/source | |
1296 | @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ | |
1297 | rm -f $(MODLIB)/build ; \ | |
1298 | ln -s $(CURDIR) $(MODLIB)/build ; \ | |
1299 | fi | |
1300 | @cp -f $(objtree)/modules.order $(MODLIB)/ | |
1301 | @cp -f $(objtree)/modules.builtin $(MODLIB)/ | |
1302 | $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst | |
1303 | ||
1304 | # This depmod is only for convenience to give the initial | |
1305 | # boot a modules.dep even before / is mounted read-write. However the | |
1306 | # boot script depmod is the master version. | |
1307 | PHONY += _modinst_post | |
1308 | _modinst_post: _modinst_ | |
1309 | $(call cmd,depmod) | |
1310 | ||
1311 | ifeq ($(CONFIG_MODULE_SIG), y) | |
1312 | PHONY += modules_sign | |
1313 | modules_sign: | |
1314 | $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign | |
1315 | endif | |
1316 | ||
1317 | else # CONFIG_MODULES | |
1318 | ||
1319 | # Modules not configured | |
1320 | # --------------------------------------------------------------------------- | |
1321 | ||
1322 | PHONY += modules modules_install | |
1323 | modules modules_install: | |
1324 | @echo >&2 | |
1325 | @echo >&2 "The present kernel configuration has modules disabled." | |
1326 | @echo >&2 "Type 'make config' and enable loadable module support." | |
1327 | @echo >&2 "Then build a kernel with module support enabled." | |
1328 | @echo >&2 | |
1329 | @exit 1 | |
1330 | ||
1331 | endif # CONFIG_MODULES | |
1332 | ||
1333 | ### | |
1334 | # Cleaning is done on three levels. | |
1335 | # make clean Delete most generated files | |
1336 | # Leave enough to build external modules | |
1337 | # make mrproper Delete the current configuration, and all generated files | |
1338 | # make distclean Remove editor backup files, patch leftover files and the like | |
1339 | ||
1340 | # Directories & files removed with 'make clean' | |
1341 | CLEAN_DIRS += $(MODVERDIR) include/ksym | |
1342 | ||
1343 | # Directories & files removed with 'make mrproper' | |
1344 | MRPROPER_DIRS += include/config usr/include include/generated \ | |
1345 | arch/*/include/generated .tmp_objdiff | |
1346 | MRPROPER_FILES += .config .config.old .version \ | |
1347 | Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ | |
1348 | signing_key.pem signing_key.priv signing_key.x509 \ | |
1349 | x509.genkey extra_certificates signing_key.x509.keyid \ | |
1350 | signing_key.x509.signer vmlinux-gdb.py | |
1351 | ||
1352 | # clean - Delete most, but leave enough to build external modules | |
1353 | # | |
1354 | clean: rm-dirs := $(CLEAN_DIRS) | |
1355 | clean: rm-files := $(CLEAN_FILES) | |
1356 | clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) | |
1357 | ||
1358 | PHONY += $(clean-dirs) clean archclean vmlinuxclean | |
1359 | $(clean-dirs): | |
1360 | $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) | |
1361 | ||
1362 | vmlinuxclean: | |
1363 | $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean | |
1364 | $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) | |
1365 | ||
1366 | clean: archclean vmlinuxclean | |
1367 | ||
1368 | # mrproper - Delete all generated files, including .config | |
1369 | # | |
1370 | mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) | |
1371 | mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) | |
1372 | mrproper-dirs := $(addprefix _mrproper_,scripts) | |
1373 | ||
1374 | PHONY += $(mrproper-dirs) mrproper archmrproper | |
1375 | $(mrproper-dirs): | |
1376 | $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) | |
1377 | ||
1378 | mrproper: clean archmrproper $(mrproper-dirs) | |
1379 | $(call cmd,rmdirs) | |
1380 | $(call cmd,rmfiles) | |
1381 | ||
1382 | # distclean | |
1383 | # | |
1384 | PHONY += distclean | |
1385 | ||
1386 | distclean: mrproper | |
1387 | @find $(srctree) $(RCS_FIND_IGNORE) \ | |
1388 | \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ | |
1389 | -o -name '*.bak' -o -name '#*#' -o -name '*%' \ | |
1390 | -o -name 'core' \) \ | |
1391 | -type f -print | xargs rm -f | |
1392 | ||
1393 | ||
1394 | # Packaging of the kernel to various formats | |
1395 | # --------------------------------------------------------------------------- | |
1396 | # rpm target kept for backward compatibility | |
1397 | package-dir := scripts/package | |
1398 | ||
1399 | %src-pkg: FORCE | |
1400 | $(Q)$(MAKE) $(build)=$(package-dir) $@ | |
1401 | %pkg: include/config/kernel.release FORCE | |
1402 | $(Q)$(MAKE) $(build)=$(package-dir) $@ | |
1403 | rpm: rpm-pkg | |
1404 | @echo " WARNING: \"rpm\" target will be removed after Linux 4.18" | |
1405 | @echo " Please use \"rpm-pkg\" instead." | |
1406 | ||
1407 | ||
1408 | # Brief documentation of the typical targets used | |
1409 | # --------------------------------------------------------------------------- | |
1410 | ||
1411 | boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) | |
1412 | boards := $(sort $(notdir $(boards))) | |
1413 | board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) | |
1414 | board-dirs := $(sort $(notdir $(board-dirs:/=))) | |
1415 | ||
1416 | PHONY += help | |
1417 | help: | |
1418 | @echo 'Cleaning targets:' | |
1419 | @echo ' clean - Remove most generated files but keep the config and' | |
1420 | @echo ' enough build support to build external modules' | |
1421 | @echo ' mrproper - Remove all generated files + config + various backup files' | |
1422 | @echo ' distclean - mrproper + remove editor backup and patch files' | |
1423 | @echo '' | |
1424 | @echo 'Configuration targets:' | |
1425 | @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help | |
1426 | @echo '' | |
1427 | @echo 'Other generic targets:' | |
1428 | @echo ' all - Build all targets marked with [*]' | |
1429 | @echo '* vmlinux - Build the bare kernel' | |
1430 | @echo '* modules - Build all modules' | |
1431 | @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' | |
1432 | @echo ' dir/ - Build all files in dir and below' | |
1433 | @echo ' dir/file.[ois] - Build specified target only' | |
1434 | @echo ' dir/file.ll - Build the LLVM assembly file' | |
1435 | @echo ' (requires compiler support for LLVM assembly generation)' | |
1436 | @echo ' dir/file.lst - Build specified mixed source/assembly target only' | |
1437 | @echo ' (requires a recent binutils and recent build (System.map))' | |
1438 | @echo ' dir/file.ko - Build module including final link' | |
1439 | @echo ' modules_prepare - Set up for building external modules' | |
1440 | @echo ' tags/TAGS - Generate tags file for editors' | |
1441 | @echo ' cscope - Generate cscope index' | |
1442 | @echo ' gtags - Generate GNU GLOBAL index' | |
1443 | @echo ' kernelrelease - Output the release version string (use with make -s)' | |
1444 | @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' | |
1445 | @echo ' image_name - Output the image name (use with make -s)' | |
1446 | @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ | |
1447 | echo ' (default: $(INSTALL_HDR_PATH))'; \ | |
1448 | echo '' | |
1449 | @echo 'Static analysers:' | |
1450 | @echo ' checkstack - Generate a list of stack hogs' | |
1451 | @echo ' namespacecheck - Name space analysis on compiled kernel' | |
1452 | @echo ' versioncheck - Sanity check on version.h usage' | |
1453 | @echo ' includecheck - Check for duplicate included header files' | |
1454 | @echo ' export_report - List the usages of all exported symbols' | |
1455 | @echo ' headers_check - Sanity check on exported headers' | |
1456 | @echo ' headerdep - Detect inclusion cycles in headers' | |
1457 | @echo ' coccicheck - Check with Coccinelle' | |
1458 | @echo '' | |
1459 | @echo 'Kernel selftest:' | |
1460 | @echo ' kselftest - Build and run kernel selftest (run as root)' | |
1461 | @echo ' Build, install, and boot kernel before' | |
1462 | @echo ' running kselftest on it' | |
1463 | @echo ' kselftest-clean - Remove all generated kselftest files' | |
1464 | @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' | |
1465 | @echo ' .config.' | |
1466 | @echo '' | |
1467 | @echo 'Userspace tools targets:' | |
1468 | @echo ' use "make tools/help"' | |
1469 | @echo ' or "cd tools; make help"' | |
1470 | @echo '' | |
1471 | @echo 'Kernel packaging:' | |
1472 | @$(MAKE) $(build)=$(package-dir) help | |
1473 | @echo '' | |
1474 | @echo 'Documentation targets:' | |
1475 | @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp | |
1476 | @echo '' | |
1477 | @echo 'Architecture specific targets ($(SRCARCH)):' | |
1478 | @$(if $(archhelp),$(archhelp),\ | |
1479 | echo ' No architecture specific help defined for $(SRCARCH)') | |
1480 | @echo '' | |
1481 | @$(if $(boards), \ | |
1482 | $(foreach b, $(boards), \ | |
1483 | printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ | |
1484 | echo '') | |
1485 | @$(if $(board-dirs), \ | |
1486 | $(foreach b, $(board-dirs), \ | |
1487 | printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ | |
1488 | printf " %-16s - Show all of the above\\n" help-boards; \ | |
1489 | echo '') | |
1490 | ||
1491 | @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' | |
1492 | @echo ' make V=2 [targets] 2 => give reason for rebuild of target' | |
1493 | @echo ' make O=dir [targets] Locate all output files in "dir", including .config' | |
1494 | @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' | |
1495 | @echo ' make C=2 [targets] Force check of all c source with $$CHECK' | |
1496 | @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' | |
1497 | @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' | |
1498 | @echo ' 1: warnings which may be relevant and do not occur too often' | |
1499 | @echo ' 2: warnings which occur quite often but may still be relevant' | |
1500 | @echo ' 3: more obscure warnings, can most likely be ignored' | |
1501 | @echo ' Multiple levels can be combined with W=12 or W=123' | |
1502 | @echo '' | |
1503 | @echo 'Execute "make" or "make all" to build all targets marked with [*] ' | |
1504 | @echo 'For further info see the ./README file' | |
1505 | ||
1506 | ||
1507 | help-board-dirs := $(addprefix help-,$(board-dirs)) | |
1508 | ||
1509 | help-boards: $(help-board-dirs) | |
1510 | ||
1511 | boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) | |
1512 | ||
1513 | $(help-board-dirs): help-%: | |
1514 | @echo 'Architecture specific targets ($(SRCARCH) $*):' | |
1515 | @$(if $(boards-per-dir), \ | |
1516 | $(foreach b, $(boards-per-dir), \ | |
1517 | printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ | |
1518 | echo '') | |
1519 | ||
1520 | ||
1521 | # Documentation targets | |
1522 | # --------------------------------------------------------------------------- | |
1523 | DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ | |
1524 | linkcheckdocs dochelp refcheckdocs | |
1525 | PHONY += $(DOC_TARGETS) | |
1526 | $(DOC_TARGETS): scripts_basic FORCE | |
1527 | $(Q)$(MAKE) $(build)=Documentation $@ | |
1528 | ||
1529 | else # KBUILD_EXTMOD | |
1530 | ||
1531 | ### | |
1532 | # External module support. | |
1533 | # When building external modules the kernel used as basis is considered | |
1534 | # read-only, and no consistency checks are made and the make | |
1535 | # system is not used on the basis kernel. If updates are required | |
1536 | # in the basis kernel ordinary make commands (without M=...) must | |
1537 | # be used. | |
1538 | # | |
1539 | # The following are the only valid targets when building external | |
1540 | # modules. | |
1541 | # make M=dir clean Delete all automatically generated files | |
1542 | # make M=dir modules Make all modules in specified dir | |
1543 | # make M=dir Same as 'make M=dir modules' | |
1544 | # make M=dir modules_install | |
1545 | # Install the modules built in the module directory | |
1546 | # Assumes install directory is already created | |
1547 | ||
1548 | # We are always building modules | |
1549 | KBUILD_MODULES := 1 | |
1550 | PHONY += crmodverdir | |
1551 | crmodverdir: | |
1552 | $(cmd_crmodverdir) | |
1553 | ||
1554 | PHONY += $(objtree)/Module.symvers | |
1555 | $(objtree)/Module.symvers: | |
1556 | @test -e $(objtree)/Module.symvers || ( \ | |
1557 | echo; \ | |
1558 | echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ | |
1559 | echo " is missing; modules will have no dependencies and modversions."; \ | |
1560 | echo ) | |
1561 | ||
1562 | module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) | |
1563 | PHONY += $(module-dirs) modules | |
1564 | $(module-dirs): crmodverdir $(objtree)/Module.symvers | |
1565 | $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) | |
1566 | ||
1567 | modules: $(module-dirs) | |
1568 | @$(kecho) ' Building modules, stage 2.'; | |
1569 | $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost | |
1570 | ||
1571 | PHONY += modules_install | |
1572 | modules_install: _emodinst_ _emodinst_post | |
1573 | ||
1574 | install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) | |
1575 | PHONY += _emodinst_ | |
1576 | _emodinst_: | |
1577 | $(Q)mkdir -p $(MODLIB)/$(install-dir) | |
1578 | $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst | |
1579 | ||
1580 | PHONY += _emodinst_post | |
1581 | _emodinst_post: _emodinst_ | |
1582 | $(call cmd,depmod) | |
1583 | ||
1584 | clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) | |
1585 | ||
1586 | PHONY += $(clean-dirs) clean | |
1587 | $(clean-dirs): | |
1588 | $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) | |
1589 | ||
1590 | clean: rm-dirs := $(MODVERDIR) | |
1591 | clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers | |
1592 | ||
1593 | PHONY += help | |
1594 | help: | |
1595 | @echo ' Building external modules.' | |
1596 | @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' | |
1597 | @echo '' | |
1598 | @echo ' modules - default target, build the module(s)' | |
1599 | @echo ' modules_install - install the module' | |
1600 | @echo ' clean - remove generated files in module directory only' | |
1601 | @echo '' | |
1602 | ||
1603 | # Dummies... | |
1604 | PHONY += prepare scripts | |
1605 | prepare: ; | |
1606 | scripts: ; | |
1607 | endif # KBUILD_EXTMOD | |
1608 | ||
1609 | clean: $(clean-dirs) | |
1610 | $(call cmd,rmdirs) | |
1611 | $(call cmd,rmfiles) | |
1612 | @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ | |
1613 | \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ | |
1614 | -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \ | |
1615 | -o -name '*.dwo' -o -name '*.lst' \ | |
1616 | -o -name '*.su' \ | |
1617 | -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ | |
1618 | -o -name '*.symtypes' -o -name 'modules.order' \ | |
1619 | -o -name modules.builtin -o -name '.tmp_*.o.*' \ | |
1620 | -o -name .cache.mk \ | |
1621 | -o -name '*.c.[012]*.*' \ | |
1622 | -o -name '*.ll' \ | |
1623 | -o -name '*.gcno' \) -type f -print | xargs rm -f | |
1624 | ||
1625 | # Generate tags for editors | |
1626 | # --------------------------------------------------------------------------- | |
1627 | quiet_cmd_tags = GEN $@ | |
1628 | cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ | |
1629 | ||
1630 | tags TAGS cscope gtags: FORCE | |
1631 | $(call cmd,tags) | |
1632 | ||
1633 | # Scripts to check various things for consistency | |
1634 | # --------------------------------------------------------------------------- | |
1635 | ||
1636 | PHONY += includecheck versioncheck coccicheck namespacecheck export_report | |
1637 | ||
1638 | includecheck: | |
1639 | find $(srctree)/* $(RCS_FIND_IGNORE) \ | |
1640 | -name '*.[hcS]' -type f -print | sort \ | |
1641 | | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl | |
1642 | ||
1643 | versioncheck: | |
1644 | find $(srctree)/* $(RCS_FIND_IGNORE) \ | |
1645 | -name '*.[hcS]' -type f -print | sort \ | |
1646 | | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl | |
1647 | ||
1648 | coccicheck: | |
1649 | $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ | |
1650 | ||
1651 | namespacecheck: | |
1652 | $(PERL) $(srctree)/scripts/namespace.pl | |
1653 | ||
1654 | export_report: | |
1655 | $(PERL) $(srctree)/scripts/export_report.pl | |
1656 | ||
1657 | endif #ifeq ($(config-targets),1) | |
1658 | endif #ifeq ($(mixed-targets),1) | |
1659 | ||
1660 | PHONY += checkstack kernelrelease kernelversion image_name | |
1661 | ||
1662 | # UML needs a little special treatment here. It wants to use the host | |
1663 | # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone | |
1664 | # else wants $(ARCH), including people doing cross-builds, which means | |
1665 | # that $(SUBARCH) doesn't work here. | |
1666 | ifeq ($(ARCH), um) | |
1667 | CHECKSTACK_ARCH := $(SUBARCH) | |
1668 | else | |
1669 | CHECKSTACK_ARCH := $(ARCH) | |
1670 | endif | |
1671 | checkstack: | |
1672 | $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ | |
1673 | $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) | |
1674 | ||
1675 | kernelrelease: | |
1676 | @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" | |
1677 | ||
1678 | kernelversion: | |
1679 | @echo $(KERNELVERSION) | |
1680 | ||
1681 | image_name: | |
1682 | @echo $(KBUILD_IMAGE) | |
1683 | ||
1684 | # Clear a bunch of variables before executing the submake | |
1685 | tools/: FORCE | |
1686 | $(Q)mkdir -p $(objtree)/tools | |
1687 | $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ | |
1688 | ||
1689 | tools/%: FORCE | |
1690 | $(Q)mkdir -p $(objtree)/tools | |
1691 | $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $* | |
1692 | ||
1693 | # Single targets | |
1694 | # --------------------------------------------------------------------------- | |
1695 | # Single targets are compatible with: | |
1696 | # - build with mixed source and output | |
1697 | # - build with separate output dir 'make O=...' | |
1698 | # - external modules | |
1699 | # | |
1700 | # target-dir => where to store outputfile | |
1701 | # build-dir => directory in kernel source tree to use | |
1702 | ||
1703 | ifeq ($(KBUILD_EXTMOD),) | |
1704 | build-dir = $(patsubst %/,%,$(dir $@)) | |
1705 | target-dir = $(dir $@) | |
1706 | else | |
1707 | zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) | |
1708 | build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) | |
1709 | target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) | |
1710 | endif | |
1711 | ||
1712 | %.s: %.c prepare scripts FORCE | |
1713 | $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) | |
1714 | %.i: %.c prepare scripts FORCE | |
1715 | $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) | |
1716 | %.o: %.c prepare scripts FORCE | |
1717 | $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) | |
1718 | %.lst: %.c prepare scripts FORCE | |
1719 | $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) | |
1720 | %.s: %.S prepare scripts FORCE | |
1721 | $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) | |
1722 | %.o: %.S prepare scripts FORCE | |
1723 | $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) | |
1724 | %.symtypes: %.c prepare scripts FORCE | |
1725 | $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) | |
1726 | %.ll: %.c prepare scripts FORCE | |
1727 | $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) | |
1728 | ||
1729 | # Modules | |
1730 | /: prepare scripts FORCE | |
1731 | $(cmd_crmodverdir) | |
1732 | $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ | |
1733 | $(build)=$(build-dir) | |
1734 | # Make sure the latest headers are built for Documentation | |
1735 | Documentation/ samples/: headers_install | |
1736 | %/: prepare scripts FORCE | |
1737 | $(cmd_crmodverdir) | |
1738 | $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ | |
1739 | $(build)=$(build-dir) | |
1740 | %.ko: prepare scripts FORCE | |
1741 | $(cmd_crmodverdir) | |
1742 | $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ | |
1743 | $(build)=$(build-dir) $(@:.ko=.o) | |
1744 | $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost | |
1745 | ||
1746 | # FIXME Should go into a make.lib or something | |
1747 | # =========================================================================== | |
1748 | ||
1749 | quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) | |
1750 | cmd_rmdirs = rm -rf $(rm-dirs) | |
1751 | ||
1752 | quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) | |
1753 | cmd_rmfiles = rm -f $(rm-files) | |
1754 | ||
1755 | # Run depmod only if we have System.map and depmod is executable | |
1756 | quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) | |
1757 | cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ | |
1758 | $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))" | |
1759 | ||
1760 | # Create temporary dir for module support files | |
1761 | # clean it up only when building all modules | |
1762 | cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ | |
1763 | $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) | |
1764 | ||
1765 | # read all saved command lines | |
1766 | ||
1767 | cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd)) | |
1768 | ||
1769 | ifneq ($(cmd_files),) | |
1770 | $(cmd_files): ; # Do not try to update included dependency files | |
1771 | include $(cmd_files) | |
1772 | endif | |
1773 | ||
1774 | endif # skip-makefile | |
1775 | ||
1776 | PHONY += FORCE | |
1777 | FORCE: | |
1778 | ||
1779 | # Declare the contents of the .PHONY variable as phony. We keep that | |
1780 | # information in a variable so we can use it in if_changed and friends. | |
1781 | .PHONY: $(PHONY) |