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TOMOYO Linux Cross Reference
Linux/Makefile

Version: ~ [ linux-5.15-rc5 ] ~ [ linux-5.14.11 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.72 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.152 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.210 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.250 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.286 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.288 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 # SPDX-License-Identifier: GPL-2.0
  2 VERSION = 5
  3 PATCHLEVEL = 0
  4 SUBLEVEL = 21
  5 EXTRAVERSION =
  6 NAME = Shy Crocodile
  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 # We are using a recursive build, so we need to do a little thinking
 19 # to get the ordering right.
 20 #
 21 # Most importantly: sub-Makefiles should only ever modify files in
 22 # their own directory. If in some directory we have a dependency on
 23 # a file in another dir (which doesn't happen often, but it's often
 24 # unavoidable when linking the built-in.a targets which finally
 25 # turn into vmlinux), we will call a sub make in that other dir, and
 26 # after that we are sure that everything which is in that other dir
 27 # is now up to date.
 28 #
 29 # The only cases where we need to modify files which have global
 30 # effects are thus separated out and done before the recursive
 31 # descending is started. They are now explicitly listed as the
 32 # prepare rule.
 33 
 34 ifneq ($(sub_make_done),1)
 35 
 36 # Do not use make's built-in rules and variables
 37 # (this increases performance and avoids hard-to-debug behaviour)
 38 MAKEFLAGS += -rR
 39 
 40 # Avoid funny character set dependencies
 41 unexport LC_ALL
 42 LC_COLLATE=C
 43 LC_NUMERIC=C
 44 export LC_COLLATE LC_NUMERIC
 45 
 46 # Avoid interference with shell env settings
 47 unexport GREP_OPTIONS
 48 
 49 # Beautify output
 50 # ---------------------------------------------------------------------------
 51 #
 52 # Normally, we echo the whole command before executing it. By making
 53 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 54 # $(quiet) to choose other forms of output instead, e.g.
 55 #
 56 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 57 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 58 #
 59 # If $(quiet) is empty, the whole command will be printed.
 60 # If it is set to "quiet_", only the short version will be printed.
 61 # If it is set to "silent_", nothing will be printed at all, since
 62 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 63 #
 64 # A simple variant is to prefix commands with $(Q) - that's useful
 65 # for commands that shall be hidden in non-verbose mode.
 66 #
 67 #       $(Q)ln $@ :<
 68 #
 69 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 70 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 71 #
 72 # To put more focus on warnings, be less verbose as default
 73 # Use 'make V=1' to see the full commands
 74 
 75 ifeq ("$(origin V)", "command line")
 76   KBUILD_VERBOSE = $(V)
 77 endif
 78 ifndef KBUILD_VERBOSE
 79   KBUILD_VERBOSE = 0
 80 endif
 81 
 82 ifeq ($(KBUILD_VERBOSE),1)
 83   quiet =
 84   Q =
 85 else
 86   quiet=quiet_
 87   Q = @
 88 endif
 89 
 90 # If the user is running make -s (silent mode), suppress echoing of
 91 # commands
 92 
 93 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
 94   quiet=silent_
 95   tools_silent=s
 96 endif
 97 
 98 export quiet Q KBUILD_VERBOSE
 99 
100 # kbuild supports saving output files in a separate directory.
101 # To locate output files in a separate directory two syntaxes are supported.
102 # In both cases the working directory must be the root of the kernel src.
103 # 1) O=
104 # Use "make O=dir/to/store/output/files/"
105 #
106 # 2) Set KBUILD_OUTPUT
107 # Set the environment variable KBUILD_OUTPUT to point to the directory
108 # where the output files shall be placed.
109 # export KBUILD_OUTPUT=dir/to/store/output/files/
110 # make
111 #
112 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
113 # variable.
114 
115 # KBUILD_SRC is not intended to be used by the regular user (for now),
116 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
117 
118 # OK, Make called in directory where kernel src resides
119 # Do we want to locate output files in a separate directory?
120 ifeq ("$(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 # Look for make include files relative to root of kernel src
140 #
141 # This does not become effective immediately because MAKEFLAGS is re-parsed
142 # once after the Makefile is read.  It is OK since we are going to invoke
143 # 'sub-make' below.
144 MAKEFLAGS += --include-dir=$(CURDIR)
145 
146 need-sub-make := 1
147 else
148 
149 # Do not print "Entering directory ..." at all for in-tree build.
150 MAKEFLAGS += --no-print-directory
151 
152 endif # ifneq ($(KBUILD_OUTPUT),)
153 
154 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
155 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
156 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
157 need-sub-make := 1
158 # Cancel implicit rules for this Makefile.
159 $(lastword $(MAKEFILE_LIST)): ;
160 endif
161 
162 export sub_make_done := 1
163 
164 ifeq ($(need-sub-make),1)
165 
166 PHONY += $(MAKECMDGOALS) sub-make
167 
168 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
169         @:
170 
171 # Invoke a second make in the output directory, passing relevant variables
172 sub-make:
173         $(Q)$(MAKE) \
174         $(if $(KBUILD_OUTPUT),-C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR)) \
175         -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
176 
177 endif # need-sub-make
178 endif # sub_make_done
179 
180 # We process the rest of the Makefile if this is the final invocation of make
181 ifeq ($(need-sub-make),)
182 
183 # Do not print "Entering directory ...",
184 # but we want to display it when entering to the output directory
185 # so that IDEs/editors are able to understand relative filenames.
186 MAKEFLAGS += --no-print-directory
187 
188 # Call a source code checker (by default, "sparse") as part of the
189 # C compilation.
190 #
191 # Use 'make C=1' to enable checking of only re-compiled files.
192 # Use 'make C=2' to enable checking of *all* source files, regardless
193 # of whether they are re-compiled or not.
194 #
195 # See the file "Documentation/dev-tools/sparse.rst" for more details,
196 # including where to get the "sparse" utility.
197 
198 ifeq ("$(origin C)", "command line")
199   KBUILD_CHECKSRC = $(C)
200 endif
201 ifndef KBUILD_CHECKSRC
202   KBUILD_CHECKSRC = 0
203 endif
204 
205 # Use make M=dir to specify directory of external module to build
206 # Old syntax make ... SUBDIRS=$PWD is still supported
207 # Setting the environment variable KBUILD_EXTMOD take precedence
208 ifdef SUBDIRS
209   $(warning ================= WARNING ================)
210   $(warning 'SUBDIRS' will be removed after Linux 5.3)
211   $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead)
212   $(warning ==========================================)
213   KBUILD_EXTMOD ?= $(SUBDIRS)
214 endif
215 
216 ifeq ("$(origin M)", "command line")
217   KBUILD_EXTMOD := $(M)
218 endif
219 
220 ifeq ($(KBUILD_SRC),)
221         # building in the source tree
222         srctree := .
223 else
224         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
225                 # building in a subdirectory of the source tree
226                 srctree := ..
227         else
228                 srctree := $(KBUILD_SRC)
229         endif
230 endif
231 
232 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
233 
234 objtree         := .
235 src             := $(srctree)
236 obj             := $(objtree)
237 
238 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
239 
240 export srctree objtree VPATH
241 
242 # To make sure we do not include .config for any of the *config targets
243 # catch them early, and hand them over to scripts/kconfig/Makefile
244 # It is allowed to specify more targets when calling make, including
245 # mixing *config targets and build targets.
246 # For example 'make oldconfig all'.
247 # Detect when mixed targets is specified, and make a second invocation
248 # of make so .config is not included in this case either (for *config).
249 
250 version_h := include/generated/uapi/linux/version.h
251 old_version_h := include/linux/version.h
252 
253 clean-targets := %clean mrproper cleandocs
254 no-dot-config-targets := $(clean-targets) \
255                          cscope gtags TAGS tags help% %docs check% coccicheck \
256                          $(version_h) headers_% archheaders archscripts \
257                          %asm-generic kernelversion %src-pkg
258 no-sync-config-targets := $(no-dot-config-targets) install %install \
259                            kernelrelease
260 
261 config-targets  := 0
262 mixed-targets   := 0
263 dot-config      := 1
264 may-sync-config := 1
265 
266 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
267         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
268                 dot-config := 0
269         endif
270 endif
271 
272 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
273         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
274                 may-sync-config := 0
275         endif
276 endif
277 
278 ifneq ($(KBUILD_EXTMOD),)
279         may-sync-config := 0
280 endif
281 
282 ifeq ($(KBUILD_EXTMOD),)
283         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
284                 config-targets := 1
285                 ifneq ($(words $(MAKECMDGOALS)),1)
286                         mixed-targets := 1
287                 endif
288         endif
289 endif
290 
291 # For "make -j clean all", "make -j mrproper defconfig all", etc.
292 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
293         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
294                 mixed-targets := 1
295         endif
296 endif
297 
298 # install and modules_install need also be processed one by one
299 ifneq ($(filter install,$(MAKECMDGOALS)),)
300         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
301                 mixed-targets := 1
302         endif
303 endif
304 
305 ifeq ($(mixed-targets),1)
306 # ===========================================================================
307 # We're called with mixed targets (*config and build targets).
308 # Handle them one by one.
309 
310 PHONY += $(MAKECMDGOALS) __build_one_by_one
311 
312 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
313         @:
314 
315 __build_one_by_one:
316         $(Q)set -e; \
317         for i in $(MAKECMDGOALS); do \
318                 $(MAKE) -f $(srctree)/Makefile $$i; \
319         done
320 
321 else
322 
323 # We need some generic definitions (do not try to remake the file).
324 scripts/Kbuild.include: ;
325 include scripts/Kbuild.include
326 
327 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
328 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
329 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
330 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
331 
332 include scripts/subarch.include
333 
334 # Cross compiling and selecting different set of gcc/bin-utils
335 # ---------------------------------------------------------------------------
336 #
337 # When performing cross compilation for other architectures ARCH shall be set
338 # to the target architecture. (See arch/* for the possibilities).
339 # ARCH can be set during invocation of make:
340 # make ARCH=ia64
341 # Another way is to have ARCH set in the environment.
342 # The default ARCH is the host where make is executed.
343 
344 # CROSS_COMPILE specify the prefix used for all executables used
345 # during compilation. Only gcc and related bin-utils executables
346 # are prefixed with $(CROSS_COMPILE).
347 # CROSS_COMPILE can be set on the command line
348 # make CROSS_COMPILE=ia64-linux-
349 # Alternatively CROSS_COMPILE can be set in the environment.
350 # Default value for CROSS_COMPILE is not to prefix executables
351 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
352 ARCH            ?= $(SUBARCH)
353 
354 # Architecture as present in compile.h
355 UTS_MACHINE     := $(ARCH)
356 SRCARCH         := $(ARCH)
357 
358 # Additional ARCH settings for x86
359 ifeq ($(ARCH),i386)
360         SRCARCH := x86
361 endif
362 ifeq ($(ARCH),x86_64)
363         SRCARCH := x86
364 endif
365 
366 # Additional ARCH settings for sparc
367 ifeq ($(ARCH),sparc32)
368        SRCARCH := sparc
369 endif
370 ifeq ($(ARCH),sparc64)
371        SRCARCH := sparc
372 endif
373 
374 # Additional ARCH settings for sh
375 ifeq ($(ARCH),sh64)
376        SRCARCH := sh
377 endif
378 
379 KCONFIG_CONFIG  ?= .config
380 export KCONFIG_CONFIG
381 
382 # SHELL used by kbuild
383 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
384           else if [ -x /bin/bash ]; then echo /bin/bash; \
385           else echo sh; fi ; fi)
386 
387 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
388 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
389 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
390 
391 HOSTCC       = gcc
392 HOSTCXX      = g++
393 KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
394                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
395                 $(HOSTCFLAGS)
396 KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
397 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
398 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
399 
400 # Make variables (CC, etc...)
401 AS              = $(CROSS_COMPILE)as
402 LD              = $(CROSS_COMPILE)ld
403 CC              = $(CROSS_COMPILE)gcc
404 CPP             = $(CC) -E
405 AR              = $(CROSS_COMPILE)ar
406 NM              = $(CROSS_COMPILE)nm
407 STRIP           = $(CROSS_COMPILE)strip
408 OBJCOPY         = $(CROSS_COMPILE)objcopy
409 OBJDUMP         = $(CROSS_COMPILE)objdump
410 LEX             = flex
411 YACC            = bison
412 AWK             = awk
413 GENKSYMS        = scripts/genksyms/genksyms
414 INSTALLKERNEL  := installkernel
415 DEPMOD          = /sbin/depmod
416 PERL            = perl
417 PYTHON          = python
418 PYTHON2         = python2
419 PYTHON3         = python3
420 CHECK           = sparse
421 
422 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
423                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
424 NOSTDINC_FLAGS  =
425 CFLAGS_MODULE   =
426 AFLAGS_MODULE   =
427 LDFLAGS_MODULE  =
428 CFLAGS_KERNEL   =
429 AFLAGS_KERNEL   =
430 LDFLAGS_vmlinux =
431 
432 # Use USERINCLUDE when you must reference the UAPI directories only.
433 USERINCLUDE    := \
434                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
435                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
436                 -I$(srctree)/include/uapi \
437                 -I$(objtree)/include/generated/uapi \
438                 -include $(srctree)/include/linux/kconfig.h
439 
440 # Use LINUXINCLUDE when you must reference the include/ directory.
441 # Needed to be compatible with the O= option
442 LINUXINCLUDE    := \
443                 -I$(srctree)/arch/$(SRCARCH)/include \
444                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
445                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
446                 -I$(objtree)/include \
447                 $(USERINCLUDE)
448 
449 KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
450 KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
451                    -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
452                    -Werror-implicit-function-declaration -Werror=implicit-int \
453                    -Wno-format-security \
454                    -std=gnu89
455 KBUILD_CPPFLAGS := -D__KERNEL__
456 KBUILD_AFLAGS_KERNEL :=
457 KBUILD_CFLAGS_KERNEL :=
458 KBUILD_AFLAGS_MODULE  := -DMODULE
459 KBUILD_CFLAGS_MODULE  := -DMODULE
460 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
461 KBUILD_LDFLAGS :=
462 GCC_PLUGINS_CFLAGS :=
463 
464 export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
465 export CPP AR NM STRIP OBJCOPY OBJDUMP KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
466 export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
467 export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
468 
469 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
470 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
471 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
472 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
473 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
474 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
475 export KBUILD_ARFLAGS
476 
477 # When compiling out-of-tree modules, put MODVERDIR in the module
478 # tree rather than in the kernel tree. The kernel tree might
479 # even be read-only.
480 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
481 
482 # Files to ignore in find ... statements
483 
484 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
485                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
486                           -prune -o
487 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
488                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
489 
490 # ===========================================================================
491 # Rules shared between *config targets and build targets
492 
493 # Basic helpers built in scripts/basic/
494 PHONY += scripts_basic
495 scripts_basic:
496         $(Q)$(MAKE) $(build)=scripts/basic
497         $(Q)rm -f .tmp_quiet_recordmcount
498 
499 # To avoid any implicit rule to kick in, define an empty command.
500 scripts/basic/%: scripts_basic ;
501 
502 PHONY += outputmakefile
503 # outputmakefile generates a Makefile in the output directory, if using a
504 # separate output directory. This allows convenient use of make in the
505 # output directory.
506 outputmakefile:
507 ifneq ($(KBUILD_SRC),)
508         $(Q)ln -fsn $(srctree) source
509         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
510 endif
511 
512 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
513 ifneq ($(CROSS_COMPILE),)
514 CLANG_FLAGS     := --target=$(notdir $(CROSS_COMPILE:%-=%))
515 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
516 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)
517 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
518 endif
519 ifneq ($(GCC_TOOLCHAIN),)
520 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
521 endif
522 CLANG_FLAGS     += -no-integrated-as
523 KBUILD_CFLAGS   += $(CLANG_FLAGS)
524 KBUILD_AFLAGS   += $(CLANG_FLAGS)
525 export CLANG_FLAGS
526 endif
527 
528 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
529 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
530 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
531 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
532 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
533 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
534 export RETPOLINE_CFLAGS
535 export RETPOLINE_VDSO_CFLAGS
536 
537 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
538 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
539 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
540 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
541 CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1)
542 
543 ifeq ($(config-targets),1)
544 # ===========================================================================
545 # *config targets only - make sure prerequisites are updated, and descend
546 # in scripts/kconfig to make the *config target
547 
548 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
549 # KBUILD_DEFCONFIG may point out an alternative default configuration
550 # used for 'make defconfig'
551 include arch/$(SRCARCH)/Makefile
552 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
553 
554 config: scripts_basic outputmakefile FORCE
555         $(Q)$(MAKE) $(build)=scripts/kconfig $@
556 
557 %config: scripts_basic outputmakefile FORCE
558         $(Q)$(MAKE) $(build)=scripts/kconfig $@
559 
560 else
561 # ===========================================================================
562 # Build targets only - this includes vmlinux, arch specific targets, clean
563 # targets and others. In general all targets except *config targets.
564 
565 # If building an external module we do not care about the all: rule
566 # but instead _all depend on modules
567 PHONY += all
568 ifeq ($(KBUILD_EXTMOD),)
569 _all: all
570 else
571 _all: modules
572 endif
573 
574 # Decide whether to build built-in, modular, or both.
575 # Normally, just do built-in.
576 
577 KBUILD_MODULES :=
578 KBUILD_BUILTIN := 1
579 
580 # If we have only "make modules", don't compile built-in objects.
581 # When we're building modules with modversions, we need to consider
582 # the built-in objects during the descend as well, in order to
583 # make sure the checksums are up to date before we record them.
584 
585 ifeq ($(MAKECMDGOALS),modules)
586   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
587 endif
588 
589 # If we have "make <whatever> modules", compile modules
590 # in addition to whatever we do anyway.
591 # Just "make" or "make all" shall build modules as well
592 
593 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
594   KBUILD_MODULES := 1
595 endif
596 
597 ifeq ($(MAKECMDGOALS),)
598   KBUILD_MODULES := 1
599 endif
600 
601 export KBUILD_MODULES KBUILD_BUILTIN
602 
603 ifeq ($(KBUILD_EXTMOD),)
604 # Objects we will link into vmlinux / subdirs we need to visit
605 init-y          := init/
606 drivers-y       := drivers/ sound/ firmware/
607 net-y           := net/
608 libs-y          := lib/
609 core-y          := usr/
610 virt-y          := virt/
611 endif # KBUILD_EXTMOD
612 
613 ifeq ($(dot-config),1)
614 include include/config/auto.conf
615 endif
616 
617 # The all: target is the default when no target is given on the
618 # command line.
619 # This allow a user to issue only 'make' to build a kernel including modules
620 # Defaults to vmlinux, but the arch makefile usually adds further targets
621 all: vmlinux
622 
623 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
624         $(call cc-option,-fno-tree-loop-im) \
625         $(call cc-disable-warning,maybe-uninitialized,)
626 export CFLAGS_GCOV
627 
628 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
629 ifdef CONFIG_FUNCTION_TRACER
630   CC_FLAGS_FTRACE := -pg
631 endif
632 
633 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
634 # values of the respective KBUILD_* variables
635 ARCH_CPPFLAGS :=
636 ARCH_AFLAGS :=
637 ARCH_CFLAGS :=
638 include arch/$(SRCARCH)/Makefile
639 
640 ifeq ($(dot-config),1)
641 ifeq ($(may-sync-config),1)
642 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
643 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
644 # because some architectures define CROSS_COMPILE there.
645 include include/config/auto.conf.cmd
646 
647 # To avoid any implicit rule to kick in, define an empty command
648 $(KCONFIG_CONFIG): ;
649 
650 # The actual configuration files used during the build are stored in
651 # include/generated/ and include/config/. Update them if .config is newer than
652 # include/config/auto.conf (which mirrors .config).
653 #
654 # This exploits the 'multi-target pattern rule' trick.
655 # The syncconfig should be executed only once to make all the targets.
656 %/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
657         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
658 else
659 # External modules and some install targets need include/generated/autoconf.h
660 # and include/config/auto.conf but do not care if they are up-to-date.
661 # Use auto.conf to trigger the test
662 PHONY += include/config/auto.conf
663 
664 include/config/auto.conf:
665         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
666         echo >&2;                                                       \
667         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
668         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
669         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
670         echo >&2 ;                                                      \
671         /bin/false)
672 
673 endif # may-sync-config
674 endif # $(dot-config)
675 
676 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
677 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
678 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
679 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
680 KBUILD_CFLAGS   += $(call cc-disable-warning, int-in-bool-context)
681 
682 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
683 KBUILD_CFLAGS   += -Os $(call cc-disable-warning,maybe-uninitialized,)
684 else
685 ifdef CONFIG_PROFILE_ALL_BRANCHES
686 KBUILD_CFLAGS   += -O2 $(call cc-disable-warning,maybe-uninitialized,)
687 else
688 KBUILD_CFLAGS   += -O2
689 endif
690 endif
691 
692 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
693                         $(call cc-disable-warning,maybe-uninitialized,))
694 
695 # Tell gcc to never replace conditional load with a non-conditional one
696 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
697 
698 include scripts/Makefile.kcov
699 include scripts/Makefile.gcc-plugins
700 
701 ifdef CONFIG_READABLE_ASM
702 # Disable optimizations that make assembler listings hard to read.
703 # reorder blocks reorders the control in the function
704 # ipa clone creates specialized cloned functions
705 # partial inlining inlines only parts of functions
706 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
707                  $(call cc-option,-fno-ipa-cp-clone,) \
708                  $(call cc-option,-fno-partial-inlining)
709 endif
710 
711 ifneq ($(CONFIG_FRAME_WARN),0)
712 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
713 endif
714 
715 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
716 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
717 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
718 
719 KBUILD_CFLAGS += $(stackp-flags-y)
720 
721 ifdef CONFIG_CC_IS_CLANG
722 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
723 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
724 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
725 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
726 # Quiet clang warning: comparison of unsigned expression < 0 is always false
727 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
728 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
729 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
730 # See modpost pattern 2
731 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
732 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
733 else
734 
735 # These warnings generated too much noise in a regular build.
736 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
737 KBUILD_CFLAGS += -Wno-unused-but-set-variable
738 endif
739 
740 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
741 ifdef CONFIG_FRAME_POINTER
742 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
743 else
744 # Some targets (ARM with Thumb2, for example), can't be built with frame
745 # pointers.  For those, we don't have FUNCTION_TRACER automatically
746 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
747 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
748 # -fomit-frame-pointer with FUNCTION_TRACER.
749 ifndef CONFIG_FUNCTION_TRACER
750 KBUILD_CFLAGS   += -fomit-frame-pointer
751 endif
752 endif
753 
754 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
755 
756 ifdef CONFIG_DEBUG_INFO
757 ifdef CONFIG_DEBUG_INFO_SPLIT
758 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
759 else
760 KBUILD_CFLAGS   += -g
761 endif
762 KBUILD_AFLAGS   += -Wa,-gdwarf-2
763 endif
764 ifdef CONFIG_DEBUG_INFO_DWARF4
765 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
766 endif
767 
768 ifdef CONFIG_DEBUG_INFO_REDUCED
769 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
770                    $(call cc-option,-fno-var-tracking)
771 endif
772 
773 ifdef CONFIG_FUNCTION_TRACER
774 ifdef CONFIG_FTRACE_MCOUNT_RECORD
775   # gcc 5 supports generating the mcount tables directly
776   ifeq ($(call cc-option-yn,-mrecord-mcount),y)
777     CC_FLAGS_FTRACE     += -mrecord-mcount
778     export CC_USING_RECORD_MCOUNT := 1
779   endif
780   ifdef CONFIG_HAVE_NOP_MCOUNT
781     ifeq ($(call cc-option-yn, -mnop-mcount),y)
782       CC_FLAGS_FTRACE   += -mnop-mcount
783       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
784     endif
785   endif
786 endif
787 ifdef CONFIG_HAVE_FENTRY
788   ifeq ($(call cc-option-yn, -mfentry),y)
789     CC_FLAGS_FTRACE     += -mfentry
790     CC_FLAGS_USING      += -DCC_USING_FENTRY
791   endif
792 endif
793 export CC_FLAGS_FTRACE
794 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
795 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
796 ifdef CONFIG_DYNAMIC_FTRACE
797         ifdef CONFIG_HAVE_C_RECORDMCOUNT
798                 BUILD_C_RECORDMCOUNT := y
799                 export BUILD_C_RECORDMCOUNT
800         endif
801 endif
802 endif
803 
804 # We trigger additional mismatches with less inlining
805 ifdef CONFIG_DEBUG_SECTION_MISMATCH
806 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
807 endif
808 
809 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
810 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
811 LDFLAGS_vmlinux += --gc-sections
812 endif
813 
814 # arch Makefile may override CC so keep this after arch Makefile is included
815 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
816 
817 # warn about C99 declaration after statement
818 KBUILD_CFLAGS += -Wdeclaration-after-statement
819 
820 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
821 KBUILD_CFLAGS += $(call cc-option,-Wvla)
822 
823 # disable pointer signed / unsigned warnings in gcc 4.0
824 KBUILD_CFLAGS += -Wno-pointer-sign
825 
826 # disable stringop warnings in gcc 8+
827 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
828 
829 # disable invalid "can't wrap" optimizations for signed / pointers
830 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
831 
832 # clang sets -fmerge-all-constants by default as optimization, but this
833 # is non-conforming behavior for C and in fact breaks the kernel, so we
834 # need to disable it here generally.
835 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
836 
837 # for gcc -fno-merge-all-constants disables everything, but it is fine
838 # to have actual conforming behavior enabled.
839 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
840 
841 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
842 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
843 
844 # conserve stack if available
845 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
846 
847 # Prohibit date/time macros, which would make the build non-deterministic
848 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
849 
850 # enforce correct pointer usage
851 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
852 
853 # Require designated initializers for all marked structures
854 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
855 
856 # change __FILE__ to the relative path from the srctree
857 KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
858 
859 # use the deterministic mode of AR if available
860 KBUILD_ARFLAGS := $(call ar-option,D)
861 
862 include scripts/Makefile.kasan
863 include scripts/Makefile.extrawarn
864 include scripts/Makefile.ubsan
865 
866 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
867 # last assignments
868 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
869 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
870 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
871 
872 # Use --build-id when available.
873 LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
874 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
875 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
876 
877 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
878 LDFLAGS_vmlinux += $(call ld-option, -X,)
879 endif
880 
881 # insure the checker run with the right endianness
882 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
883 
884 # the checker needs the correct machine size
885 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
886 
887 # Default kernel image to build when no specific target is given.
888 # KBUILD_IMAGE may be overruled on the command line or
889 # set in the environment
890 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
891 # this default value
892 export KBUILD_IMAGE ?= vmlinux
893 
894 #
895 # INSTALL_PATH specifies where to place the updated kernel and system map
896 # images. Default is /boot, but you can set it to other values
897 export  INSTALL_PATH ?= /boot
898 
899 #
900 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
901 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
902 # an argument if needed. Otherwise it defaults to the kernel install path
903 #
904 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
905 
906 #
907 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
908 # relocations required by build roots.  This is not defined in the
909 # makefile but the argument can be passed to make if needed.
910 #
911 
912 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
913 export MODLIB
914 
915 #
916 # INSTALL_MOD_STRIP, if defined, will cause modules to be
917 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
918 # the default option --strip-debug will be used.  Otherwise,
919 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
920 
921 ifdef INSTALL_MOD_STRIP
922 ifeq ($(INSTALL_MOD_STRIP),1)
923 mod_strip_cmd = $(STRIP) --strip-debug
924 else
925 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
926 endif # INSTALL_MOD_STRIP=1
927 else
928 mod_strip_cmd = true
929 endif # INSTALL_MOD_STRIP
930 export mod_strip_cmd
931 
932 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
933 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
934 # or CONFIG_MODULE_COMPRESS_XZ.
935 
936 mod_compress_cmd = true
937 ifdef CONFIG_MODULE_COMPRESS
938   ifdef CONFIG_MODULE_COMPRESS_GZIP
939     mod_compress_cmd = gzip -n -f
940   endif # CONFIG_MODULE_COMPRESS_GZIP
941   ifdef CONFIG_MODULE_COMPRESS_XZ
942     mod_compress_cmd = xz -f
943   endif # CONFIG_MODULE_COMPRESS_XZ
944 endif # CONFIG_MODULE_COMPRESS
945 export mod_compress_cmd
946 
947 # Select initial ramdisk compression format, default is gzip(1).
948 # This shall be used by the dracut(8) tool while creating an initramfs image.
949 #
950 INITRD_COMPRESS-y                  := gzip
951 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
952 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
953 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
954 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
955 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
956 # do not export INITRD_COMPRESS, since we didn't actually
957 # choose a sane default compression above.
958 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
959 
960 ifdef CONFIG_MODULE_SIG_ALL
961 $(eval $(call config_filename,MODULE_SIG_KEY))
962 
963 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
964 else
965 mod_sign_cmd = true
966 endif
967 export mod_sign_cmd
968 
969 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
970 
971 ifdef CONFIG_STACK_VALIDATION
972   has_libelf := $(call try-run,\
973                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
974   ifeq ($(has_libelf),1)
975     objtool_target := tools/objtool FORCE
976   else
977     SKIP_STACK_VALIDATION := 1
978     export SKIP_STACK_VALIDATION
979   endif
980 endif
981 
982 PHONY += prepare0
983 
984 ifeq ($(KBUILD_EXTMOD),)
985 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
986 
987 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
988                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
989                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
990 
991 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
992                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
993 
994 init-y          := $(patsubst %/, %/built-in.a, $(init-y))
995 core-y          := $(patsubst %/, %/built-in.a, $(core-y))
996 drivers-y       := $(patsubst %/, %/built-in.a, $(drivers-y))
997 net-y           := $(patsubst %/, %/built-in.a, $(net-y))
998 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
999 libs-y2         := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
1000 virt-y          := $(patsubst %/, %/built-in.a, $(virt-y))
1001 
1002 # Externally visible symbols (used by link-vmlinux.sh)
1003 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
1004 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
1005 export KBUILD_VMLINUX_LIBS := $(libs-y1)
1006 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1007 export LDFLAGS_vmlinux
1008 # used by scripts/package/Makefile
1009 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
1010 
1011 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
1012 
1013 # Recurse until adjust_autoksyms.sh is satisfied
1014 PHONY += autoksyms_recursive
1015 autoksyms_recursive: $(vmlinux-deps)
1016 ifdef CONFIG_TRIM_UNUSED_KSYMS
1017         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1018           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1019 endif
1020 
1021 # For the kernel to actually contain only the needed exported symbols,
1022 # we have to build modules as well to determine what those symbols are.
1023 # (this can be evaluated only once include/config/auto.conf has been included)
1024 ifdef CONFIG_TRIM_UNUSED_KSYMS
1025   KBUILD_MODULES := 1
1026 endif
1027 
1028 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1029 
1030 $(autoksyms_h):
1031         $(Q)mkdir -p $(dir $@)
1032         $(Q)touch $@
1033 
1034 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1035 
1036 # Final link of vmlinux with optional arch pass after final link
1037 cmd_link-vmlinux =                                                 \
1038         $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1039         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1040 
1041 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1042 ifdef CONFIG_GDB_SCRIPTS
1043         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1044 endif
1045         +$(call if_changed,link-vmlinux)
1046 
1047 targets := vmlinux
1048 
1049 # Build samples along the rest of the kernel. This needs headers_install.
1050 ifdef CONFIG_SAMPLES
1051 vmlinux-dirs += samples
1052 samples: headers_install
1053 endif
1054 
1055 # The actual objects are generated when descending,
1056 # make sure no implicit rule kicks in
1057 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1058 
1059 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1060 # Preset locale variables to speed up the build process. Limit locale
1061 # tweaks to this spot to avoid wrong language settings when running
1062 # make menuconfig etc.
1063 # Error messages still appears in the original language
1064 
1065 PHONY += $(vmlinux-dirs)
1066 $(vmlinux-dirs): prepare
1067         $(Q)$(MAKE) $(build)=$@ need-builtin=1
1068 
1069 filechk_kernel.release = \
1070         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1071 
1072 # Store (new) KERNELRELEASE string in include/config/kernel.release
1073 include/config/kernel.release: $(srctree)/Makefile FORCE
1074         $(call filechk,kernel.release)
1075 
1076 # Additional helpers built in scripts/
1077 # Carefully list dependencies so we do not try to build scripts twice
1078 # in parallel
1079 PHONY += scripts
1080 scripts: scripts_basic scripts_dtc
1081         $(Q)$(MAKE) $(build)=$(@)
1082 
1083 # Things we need to do before we recursively start building the kernel
1084 # or the modules are listed in "prepare".
1085 # A multi level approach is used. prepareN is processed before prepareN-1.
1086 # archprepare is used in arch Makefiles and when processed asm symlink,
1087 # version.h and scripts_basic is processed / created.
1088 
1089 PHONY += prepare archprepare prepare1 prepare2 prepare3
1090 
1091 # prepare3 is used to check if we are building in a separate output directory,
1092 # and if so do:
1093 # 1) Check that make has not been executed in the kernel src $(srctree)
1094 prepare3: include/config/kernel.release
1095 ifneq ($(KBUILD_SRC),)
1096         @$(kecho) '  Using $(srctree) as source for kernel'
1097         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1098                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1099                 echo >&2 "  in the '$(srctree)' directory.";\
1100                 /bin/false; \
1101         fi;
1102 endif
1103 
1104 # prepare2 creates a makefile if using a separate output directory.
1105 # From this point forward, .config has been reprocessed, so any rules
1106 # that need to depend on updated CONFIG_* values can be checked here.
1107 prepare2: prepare3 outputmakefile asm-generic
1108 
1109 prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1110         $(cmd_crmodverdir)
1111 
1112 archprepare: archheaders archscripts prepare1 scripts
1113 
1114 prepare0: archprepare
1115         $(Q)$(MAKE) $(build)=scripts/mod
1116         $(Q)$(MAKE) $(build)=.
1117 
1118 # All the preparing..
1119 prepare: prepare0 prepare-objtool
1120 
1121 # Support for using generic headers in asm-generic
1122 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1123 
1124 PHONY += asm-generic uapi-asm-generic
1125 asm-generic: uapi-asm-generic
1126         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm
1127 uapi-asm-generic:
1128         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm
1129 
1130 PHONY += prepare-objtool
1131 prepare-objtool: $(objtool_target)
1132 ifeq ($(SKIP_STACK_VALIDATION),1)
1133 ifdef CONFIG_UNWINDER_ORC
1134         @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1135         @false
1136 else
1137         @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1138 endif
1139 endif
1140 
1141 # Generate some files
1142 # ---------------------------------------------------------------------------
1143 
1144 # KERNELRELEASE can change from a few different places, meaning version.h
1145 # needs to be updated, so this check is forced on all builds
1146 
1147 uts_len := 64
1148 define filechk_utsrelease.h
1149         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1150           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1151           exit 1;                                                         \
1152         fi;                                                               \
1153         echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1154 endef
1155 
1156 define filechk_version.h
1157         echo \#define LINUX_VERSION_CODE $(shell                         \
1158         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1159         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1160 endef
1161 
1162 $(version_h): FORCE
1163         $(call filechk,version.h)
1164         $(Q)rm -f $(old_version_h)
1165 
1166 include/generated/utsrelease.h: include/config/kernel.release FORCE
1167         $(call filechk,utsrelease.h)
1168 
1169 PHONY += headerdep
1170 headerdep:
1171         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1172         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1173 
1174 # ---------------------------------------------------------------------------
1175 # Kernel headers
1176 
1177 #Default location for installed headers
1178 export INSTALL_HDR_PATH = $(objtree)/usr
1179 
1180 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1181 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1182 
1183 PHONY += archheaders archscripts
1184 
1185 PHONY += __headers
1186 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1187         $(Q)$(MAKE) $(build)=scripts build_unifdef
1188 
1189 PHONY += headers_install_all
1190 headers_install_all:
1191         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1192 
1193 PHONY += headers_install
1194 headers_install: __headers
1195         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1196           $(error Headers not exportable for the $(SRCARCH) architecture))
1197         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1198         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1199 
1200 PHONY += headers_check_all
1201 headers_check_all: headers_install_all
1202         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1203 
1204 PHONY += headers_check
1205 headers_check: headers_install
1206         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1207         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1208 
1209 ifdef CONFIG_HEADERS_CHECK
1210 all: headers_check
1211 endif
1212 
1213 # ---------------------------------------------------------------------------
1214 # Kernel selftest
1215 
1216 PHONY += kselftest
1217 kselftest:
1218         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1219 
1220 PHONY += kselftest-clean
1221 kselftest-clean:
1222         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1223 
1224 PHONY += kselftest-merge
1225 kselftest-merge:
1226         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1227         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1228                 -m $(objtree)/.config \
1229                 $(srctree)/tools/testing/selftests/*/config
1230         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1231 
1232 # ---------------------------------------------------------------------------
1233 # Devicetree files
1234 
1235 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1236 dtstree := arch/$(SRCARCH)/boot/dts
1237 endif
1238 
1239 ifneq ($(dtstree),)
1240 
1241 %.dtb: prepare3 scripts_dtc
1242         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1243 
1244 PHONY += dtbs dtbs_install dt_binding_check
1245 dtbs dtbs_check: prepare3 scripts_dtc
1246         $(Q)$(MAKE) $(build)=$(dtstree)
1247 
1248 dtbs_check: export CHECK_DTBS=1
1249 dtbs_check: dt_binding_check
1250 
1251 dtbs_install:
1252         $(Q)$(MAKE) $(dtbinst)=$(dtstree)
1253 
1254 ifdef CONFIG_OF_EARLY_FLATTREE
1255 all: dtbs
1256 endif
1257 
1258 endif
1259 
1260 PHONY += scripts_dtc
1261 scripts_dtc: scripts_basic
1262         $(Q)$(MAKE) $(build)=scripts/dtc
1263 
1264 dt_binding_check: scripts_dtc
1265         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1266 
1267 # ---------------------------------------------------------------------------
1268 # Modules
1269 
1270 ifdef CONFIG_MODULES
1271 
1272 # By default, build modules as well
1273 
1274 all: modules
1275 
1276 # Build modules
1277 #
1278 # A module can be listed more than once in obj-m resulting in
1279 # duplicate lines in modules.order files.  Those are removed
1280 # using awk while concatenating to the final file.
1281 
1282 PHONY += modules
1283 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1284         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1285         @$(kecho) '  Building modules, stage 2.';
1286         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1287 
1288 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1289         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1290 
1291 %/modules.builtin: include/config/auto.conf include/config/tristate.conf
1292         $(Q)$(MAKE) $(modbuiltin)=$*
1293 
1294 
1295 # Target to prepare building external modules
1296 PHONY += modules_prepare
1297 modules_prepare: prepare
1298 
1299 # Target to install modules
1300 PHONY += modules_install
1301 modules_install: _modinst_ _modinst_post
1302 
1303 PHONY += _modinst_
1304 _modinst_:
1305         @rm -rf $(MODLIB)/kernel
1306         @rm -f $(MODLIB)/source
1307         @mkdir -p $(MODLIB)/kernel
1308         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1309         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1310                 rm -f $(MODLIB)/build ; \
1311                 ln -s $(CURDIR) $(MODLIB)/build ; \
1312         fi
1313         @cp -f $(objtree)/modules.order $(MODLIB)/
1314         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1315         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1316 
1317 # This depmod is only for convenience to give the initial
1318 # boot a modules.dep even before / is mounted read-write.  However the
1319 # boot script depmod is the master version.
1320 PHONY += _modinst_post
1321 _modinst_post: _modinst_
1322         $(call cmd,depmod)
1323 
1324 ifeq ($(CONFIG_MODULE_SIG), y)
1325 PHONY += modules_sign
1326 modules_sign:
1327         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1328 endif
1329 
1330 else # CONFIG_MODULES
1331 
1332 # Modules not configured
1333 # ---------------------------------------------------------------------------
1334 
1335 PHONY += modules modules_install
1336 modules modules_install:
1337         @echo >&2
1338         @echo >&2 "The present kernel configuration has modules disabled."
1339         @echo >&2 "Type 'make config' and enable loadable module support."
1340         @echo >&2 "Then build a kernel with module support enabled."
1341         @echo >&2
1342         @exit 1
1343 
1344 endif # CONFIG_MODULES
1345 
1346 ###
1347 # Cleaning is done on three levels.
1348 # make clean     Delete most generated files
1349 #                Leave enough to build external modules
1350 # make mrproper  Delete the current configuration, and all generated files
1351 # make distclean Remove editor backup files, patch leftover files and the like
1352 
1353 # Directories & files removed with 'make clean'
1354 CLEAN_DIRS  += $(MODVERDIR) include/ksym
1355 
1356 # Directories & files removed with 'make mrproper'
1357 MRPROPER_DIRS  += include/config usr/include include/generated          \
1358                   arch/*/include/generated .tmp_objdiff
1359 MRPROPER_FILES += .config .config.old .version \
1360                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1361                   signing_key.pem signing_key.priv signing_key.x509     \
1362                   x509.genkey extra_certificates signing_key.x509.keyid \
1363                   signing_key.x509.signer vmlinux-gdb.py
1364 
1365 # clean - Delete most, but leave enough to build external modules
1366 #
1367 clean: rm-dirs  := $(CLEAN_DIRS)
1368 clean: rm-files := $(CLEAN_FILES)
1369 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1370 
1371 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1372 $(clean-dirs):
1373         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1374 
1375 vmlinuxclean:
1376         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1377         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1378 
1379 clean: archclean vmlinuxclean
1380 
1381 # mrproper - Delete all generated files, including .config
1382 #
1383 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1384 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1385 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1386 
1387 PHONY += $(mrproper-dirs) mrproper
1388 $(mrproper-dirs):
1389         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1390 
1391 mrproper: clean $(mrproper-dirs)
1392         $(call cmd,rmdirs)
1393         $(call cmd,rmfiles)
1394 
1395 # distclean
1396 #
1397 PHONY += distclean
1398 
1399 distclean: mrproper
1400         @find $(srctree) $(RCS_FIND_IGNORE) \
1401                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1402                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1403                 -o -name 'core' \) \
1404                 -type f -print | xargs rm -f
1405 
1406 
1407 # Packaging of the kernel to various formats
1408 # ---------------------------------------------------------------------------
1409 package-dir     := scripts/package
1410 
1411 %src-pkg: FORCE
1412         $(Q)$(MAKE) $(build)=$(package-dir) $@
1413 %pkg: include/config/kernel.release FORCE
1414         $(Q)$(MAKE) $(build)=$(package-dir) $@
1415 
1416 
1417 # Brief documentation of the typical targets used
1418 # ---------------------------------------------------------------------------
1419 
1420 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1421 boards := $(sort $(notdir $(boards)))
1422 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1423 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1424 
1425 PHONY += help
1426 help:
1427         @echo  'Cleaning targets:'
1428         @echo  '  clean           - Remove most generated files but keep the config and'
1429         @echo  '                    enough build support to build external modules'
1430         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1431         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1432         @echo  ''
1433         @echo  'Configuration targets:'
1434         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1435         @echo  ''
1436         @echo  'Other generic targets:'
1437         @echo  '  all             - Build all targets marked with [*]'
1438         @echo  '* vmlinux         - Build the bare kernel'
1439         @echo  '* modules         - Build all modules'
1440         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1441         @echo  '  dir/            - Build all files in dir and below'
1442         @echo  '  dir/file.[ois]  - Build specified target only'
1443         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1444         @echo  '                    (requires compiler support for LLVM assembly generation)'
1445         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1446         @echo  '                    (requires a recent binutils and recent build (System.map))'
1447         @echo  '  dir/file.ko     - Build module including final link'
1448         @echo  '  modules_prepare - Set up for building external modules'
1449         @echo  '  tags/TAGS       - Generate tags file for editors'
1450         @echo  '  cscope          - Generate cscope index'
1451         @echo  '  gtags           - Generate GNU GLOBAL index'
1452         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1453         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1454         @echo  '  image_name      - Output the image name (use with make -s)'
1455         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1456          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1457          echo  ''
1458         @echo  'Static analysers:'
1459         @echo  '  checkstack      - Generate a list of stack hogs'
1460         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1461         @echo  '  versioncheck    - Sanity check on version.h usage'
1462         @echo  '  includecheck    - Check for duplicate included header files'
1463         @echo  '  export_report   - List the usages of all exported symbols'
1464         @echo  '  headers_check   - Sanity check on exported headers'
1465         @echo  '  headerdep       - Detect inclusion cycles in headers'
1466         @echo  '  coccicheck      - Check with Coccinelle'
1467         @echo  ''
1468         @echo  'Kernel selftest:'
1469         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1470         @echo  '                    Build, install, and boot kernel before'
1471         @echo  '                    running kselftest on it'
1472         @echo  '  kselftest-clean - Remove all generated kselftest files'
1473         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1474         @echo  '                    .config.'
1475         @echo  ''
1476         @$(if $(dtstree), \
1477                 echo 'Devicetree:'; \
1478                 echo '* dtbs            - Build device tree blobs for enabled boards'; \
1479                 echo '  dtbs_install    - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1480                 echo '')
1481 
1482         @echo 'Userspace tools targets:'
1483         @echo '  use "make tools/help"'
1484         @echo '  or  "cd tools; make help"'
1485         @echo  ''
1486         @echo  'Kernel packaging:'
1487         @$(MAKE) $(build)=$(package-dir) help
1488         @echo  ''
1489         @echo  'Documentation targets:'
1490         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1491         @echo  ''
1492         @echo  'Architecture specific targets ($(SRCARCH)):'
1493         @$(if $(archhelp),$(archhelp),\
1494                 echo '  No architecture specific help defined for $(SRCARCH)')
1495         @echo  ''
1496         @$(if $(boards), \
1497                 $(foreach b, $(boards), \
1498                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1499                 echo '')
1500         @$(if $(board-dirs), \
1501                 $(foreach b, $(board-dirs), \
1502                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1503                 printf "  %-16s - Show all of the above\\n" help-boards; \
1504                 echo '')
1505 
1506         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1507         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1508         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1509         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1510         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1511         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1512         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1513         @echo  '                1: warnings which may be relevant and do not occur too often'
1514         @echo  '                2: warnings which occur quite often but may still be relevant'
1515         @echo  '                3: more obscure warnings, can most likely be ignored'
1516         @echo  '                Multiple levels can be combined with W=12 or W=123'
1517         @echo  ''
1518         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1519         @echo  'For further info see the ./README file'
1520 
1521 
1522 help-board-dirs := $(addprefix help-,$(board-dirs))
1523 
1524 help-boards: $(help-board-dirs)
1525 
1526 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1527 
1528 $(help-board-dirs): help-%:
1529         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1530         @$(if $(boards-per-dir), \
1531                 $(foreach b, $(boards-per-dir), \
1532                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1533                 echo '')
1534 
1535 
1536 # Documentation targets
1537 # ---------------------------------------------------------------------------
1538 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1539                linkcheckdocs dochelp refcheckdocs
1540 PHONY += $(DOC_TARGETS)
1541 $(DOC_TARGETS): scripts_basic FORCE
1542         $(Q)$(MAKE) $(build)=Documentation $@
1543 
1544 else # KBUILD_EXTMOD
1545 
1546 ###
1547 # External module support.
1548 # When building external modules the kernel used as basis is considered
1549 # read-only, and no consistency checks are made and the make
1550 # system is not used on the basis kernel. If updates are required
1551 # in the basis kernel ordinary make commands (without M=...) must
1552 # be used.
1553 #
1554 # The following are the only valid targets when building external
1555 # modules.
1556 # make M=dir clean     Delete all automatically generated files
1557 # make M=dir modules   Make all modules in specified dir
1558 # make M=dir           Same as 'make M=dir modules'
1559 # make M=dir modules_install
1560 #                      Install the modules built in the module directory
1561 #                      Assumes install directory is already created
1562 
1563 # We are always building modules
1564 KBUILD_MODULES := 1
1565 
1566 PHONY += $(objtree)/Module.symvers
1567 $(objtree)/Module.symvers:
1568         @test -e $(objtree)/Module.symvers || ( \
1569         echo; \
1570         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1571         echo "           is missing; modules will have no dependencies and modversions."; \
1572         echo )
1573 
1574 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1575 PHONY += $(module-dirs) modules
1576 $(module-dirs): prepare $(objtree)/Module.symvers
1577         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1578 
1579 modules: $(module-dirs)
1580         @$(kecho) '  Building modules, stage 2.';
1581         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1582 
1583 PHONY += modules_install
1584 modules_install: _emodinst_ _emodinst_post
1585 
1586 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1587 PHONY += _emodinst_
1588 _emodinst_:
1589         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1590         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1591 
1592 PHONY += _emodinst_post
1593 _emodinst_post: _emodinst_
1594         $(call cmd,depmod)
1595 
1596 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1597 
1598 PHONY += $(clean-dirs) clean
1599 $(clean-dirs):
1600         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1601 
1602 clean:  rm-dirs := $(MODVERDIR)
1603 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1604 
1605 PHONY += help
1606 help:
1607         @echo  '  Building external modules.'
1608         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1609         @echo  ''
1610         @echo  '  modules         - default target, build the module(s)'
1611         @echo  '  modules_install - install the module'
1612         @echo  '  clean           - remove generated files in module directory only'
1613         @echo  ''
1614 
1615 PHONY += prepare
1616 prepare:
1617         $(cmd_crmodverdir)
1618 endif # KBUILD_EXTMOD
1619 
1620 clean: $(clean-dirs)
1621         $(call cmd,rmdirs)
1622         $(call cmd,rmfiles)
1623         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1624                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1625                 -o -name '*.ko.*' \
1626                 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1627                 -o -name '*.dwo' -o -name '*.lst' \
1628                 -o -name '*.su'  \
1629                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1630                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1631                 -o -name '*.asn1.[ch]' \
1632                 -o -name '*.symtypes' -o -name 'modules.order' \
1633                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1634                 -o -name '*.c.[012]*.*' \
1635                 -o -name '*.ll' \
1636                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1637 
1638 # Generate tags for editors
1639 # ---------------------------------------------------------------------------
1640 quiet_cmd_tags = GEN     $@
1641       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1642 
1643 tags TAGS cscope gtags: FORCE
1644         $(call cmd,tags)
1645 
1646 # Scripts to check various things for consistency
1647 # ---------------------------------------------------------------------------
1648 
1649 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1650 
1651 includecheck:
1652         find $(srctree)/* $(RCS_FIND_IGNORE) \
1653                 -name '*.[hcS]' -type f -print | sort \
1654                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1655 
1656 versioncheck:
1657         find $(srctree)/* $(RCS_FIND_IGNORE) \
1658                 -name '*.[hcS]' -type f -print | sort \
1659                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1660 
1661 coccicheck:
1662         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1663 
1664 namespacecheck:
1665         $(PERL) $(srctree)/scripts/namespace.pl
1666 
1667 export_report:
1668         $(PERL) $(srctree)/scripts/export_report.pl
1669 
1670 PHONY += checkstack kernelrelease kernelversion image_name
1671 
1672 # UML needs a little special treatment here.  It wants to use the host
1673 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1674 # else wants $(ARCH), including people doing cross-builds, which means
1675 # that $(SUBARCH) doesn't work here.
1676 ifeq ($(ARCH), um)
1677 CHECKSTACK_ARCH := $(SUBARCH)
1678 else
1679 CHECKSTACK_ARCH := $(ARCH)
1680 endif
1681 checkstack:
1682         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1683         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1684 
1685 kernelrelease:
1686         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1687 
1688 kernelversion:
1689         @echo $(KERNELVERSION)
1690 
1691 image_name:
1692         @echo $(KBUILD_IMAGE)
1693 
1694 # Clear a bunch of variables before executing the submake
1695 tools/: FORCE
1696         $(Q)mkdir -p $(objtree)/tools
1697         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1698 
1699 tools/%: FORCE
1700         $(Q)mkdir -p $(objtree)/tools
1701         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1702 
1703 # Single targets
1704 # ---------------------------------------------------------------------------
1705 # Single targets are compatible with:
1706 # - build with mixed source and output
1707 # - build with separate output dir 'make O=...'
1708 # - external modules
1709 #
1710 #  target-dir => where to store outputfile
1711 #  build-dir  => directory in kernel source tree to use
1712 
1713 ifeq ($(KBUILD_EXTMOD),)
1714         build-dir  = $(patsubst %/,%,$(dir $@))
1715         target-dir = $(dir $@)
1716 else
1717         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1718         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1719         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1720 endif
1721 
1722 %.s: %.c prepare FORCE
1723         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1724 %.i: %.c prepare FORCE
1725         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1726 %.o: %.c prepare FORCE
1727         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1728 %.lst: %.c prepare FORCE
1729         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1730 %.s: %.S prepare FORCE
1731         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1732 %.o: %.S prepare FORCE
1733         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1734 %.symtypes: %.c prepare FORCE
1735         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1736 %.ll: %.c prepare FORCE
1737         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1738 
1739 # Modules
1740 /: prepare FORCE
1741         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1742         $(build)=$(build-dir)
1743 # Make sure the latest headers are built for Documentation
1744 Documentation/ samples/: headers_install
1745 %/: prepare FORCE
1746         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1747         $(build)=$(build-dir)
1748 %.ko: prepare FORCE
1749         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1750         $(build)=$(build-dir) $(@:.ko=.o)
1751         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1752 
1753 # FIXME Should go into a make.lib or something
1754 # ===========================================================================
1755 
1756 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1757       cmd_rmdirs = rm -rf $(rm-dirs)
1758 
1759 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1760       cmd_rmfiles = rm -f $(rm-files)
1761 
1762 # Run depmod only if we have System.map and depmod is executable
1763 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1764       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1765                    $(KERNELRELEASE)
1766 
1767 # Create temporary dir for module support files
1768 # clean it up only when building all modules
1769 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1770                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1771 
1772 # read saved command lines for existing targets
1773 existing-targets := $(wildcard $(sort $(targets)))
1774 
1775 cmd_files := $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1776 $(cmd_files): ; # Do not try to update included dependency files
1777 -include $(cmd_files)
1778 
1779 endif   # ifeq ($(config-targets),1)
1780 endif   # ifeq ($(mixed-targets),1)
1781 endif   # need-sub-make
1782 
1783 PHONY += FORCE
1784 FORCE:
1785 
1786 # Declare the contents of the PHONY variable as phony.  We keep that
1787 # information in a variable so we can use it in if_changed and friends.
1788 .PHONY: $(PHONY)

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