Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

Linux/Makefile

  1 VERSION = 4
  2 PATCHLEVEL = 0
  3 SUBLEVEL = 0
  4 EXTRAVERSION =
  5 NAME = Hurr durr I'ma sheep
  6 
  7 # *DOCUMENTATION*
  8 # To see a list of typical targets execute "make help"
  9 # More info can be located in ./README
 10 # Comments in this file are targeted only to the developer, do not
 11 # expect to learn how to build the kernel reading this file.
 12 
 13 # Do not use make's built-in rules and variables
 14 # (this increases performance and avoids hard-to-debug behaviour);
 15 MAKEFLAGS += -rR
 16 
 17 # Avoid funny character set dependencies
 18 unexport LC_ALL
 19 LC_COLLATE=C
 20 LC_NUMERIC=C
 21 export LC_COLLATE LC_NUMERIC
 22 
 23 # Avoid interference with shell env settings
 24 unexport GREP_OPTIONS
 25 
 26 # We are using a recursive build, so we need to do a little thinking
 27 # to get the ordering right.
 28 #
 29 # Most importantly: sub-Makefiles should only ever modify files in
 30 # their own directory. If in some directory we have a dependency on
 31 # a file in another dir (which doesn't happen often, but it's often
 32 # unavoidable when linking the built-in.o targets which finally
 33 # turn into vmlinux), we will call a sub make in that other dir, and
 34 # after that we are sure that everything which is in that other dir
 35 # is now up to date.
 36 #
 37 # The only cases where we need to modify files which have global
 38 # effects are thus separated out and done before the recursive
 39 # descending is started. They are now explicitly listed as the
 40 # prepare rule.
 41 
 42 # Beautify output
 43 # ---------------------------------------------------------------------------
 44 #
 45 # Normally, we echo the whole command before executing it. By making
 46 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 47 # $(quiet) to choose other forms of output instead, e.g.
 48 #
 49 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 50 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 51 #
 52 # If $(quiet) is empty, the whole command will be printed.
 53 # If it is set to "quiet_", only the short version will be printed.
 54 # If it is set to "silent_", nothing will be printed at all, since
 55 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 56 #
 57 # A simple variant is to prefix commands with $(Q) - that's useful
 58 # for commands that shall be hidden in non-verbose mode.
 59 #
 60 #       $(Q)ln $@ :<
 61 #
 62 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 63 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 64 #
 65 # To put more focus on warnings, be less verbose as default
 66 # Use 'make V=1' to see the full commands
 67 
 68 ifeq ("$(origin V)", "command line")
 69   KBUILD_VERBOSE = $(V)
 70 endif
 71 ifndef KBUILD_VERBOSE
 72   KBUILD_VERBOSE = 0
 73 endif
 74 
 75 ifeq ($(KBUILD_VERBOSE),1)
 76   quiet =
 77   Q =
 78 else
 79   quiet=quiet_
 80   Q = @
 81 endif
 82 
 83 # If the user is running make -s (silent mode), suppress echoing of
 84 # commands
 85 
 86 ifneq ($(filter 4.%,$(MAKE_VERSION)),)  # make-4
 87 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
 88   quiet=silent_
 89 endif
 90 else                                    # make-3.8x
 91 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
 92   quiet=silent_
 93 endif
 94 endif
 95 
 96 export quiet Q KBUILD_VERBOSE
 97 
 98 # kbuild supports saving output files in a separate directory.
 99 # To locate output files in a separate directory two syntaxes are supported.
100 # In both cases the working directory must be the root of the kernel src.
101 # 1) O=
102 # Use "make O=dir/to/store/output/files/"
103 #
104 # 2) Set KBUILD_OUTPUT
105 # Set the environment variable KBUILD_OUTPUT to point to the directory
106 # where the output files shall be placed.
107 # export KBUILD_OUTPUT=dir/to/store/output/files/
108 # make
109 #
110 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
111 # variable.
112 
113 # KBUILD_SRC is set on invocation of make in OBJ directory
114 # KBUILD_SRC is not intended to be used by the regular user (for now)
115 ifeq ($(KBUILD_SRC),)
116 
117 # OK, Make called in directory where kernel src resides
118 # Do we want to locate output files in a separate directory?
119 ifeq ("$(origin O)", "command line")
120   KBUILD_OUTPUT := $(O)
121 endif
122 
123 # That's our default target when none is given on the command line
124 PHONY := _all
125 _all:
126 
127 # Cancel implicit rules on top Makefile
128 $(CURDIR)/Makefile Makefile: ;
129 
130 ifneq ($(KBUILD_OUTPUT),)
131 # Invoke a second make in the output directory, passing relevant variables
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                                                                 && /bin/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 sub-make: FORCE
145         $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
146         -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
147 
148 # Leave processing to above invocation of make
149 skip-makefile := 1
150 endif # ifneq ($(KBUILD_OUTPUT),)
151 endif # ifeq ($(KBUILD_SRC),)
152 
153 # We process the rest of the Makefile if this is the final invocation of make
154 ifeq ($(skip-makefile),)
155 
156 # Do not print "Entering directory ...",
157 # but we want to display it when entering to the output directory
158 # so that IDEs/editors are able to understand relative filenames.
159 MAKEFLAGS += --no-print-directory
160 
161 # Call a source code checker (by default, "sparse") as part of the
162 # C compilation.
163 #
164 # Use 'make C=1' to enable checking of only re-compiled files.
165 # Use 'make C=2' to enable checking of *all* source files, regardless
166 # of whether they are re-compiled or not.
167 #
168 # See the file "Documentation/sparse.txt" for more details, including
169 # where to get the "sparse" utility.
170 
171 ifeq ("$(origin C)", "command line")
172   KBUILD_CHECKSRC = $(C)
173 endif
174 ifndef KBUILD_CHECKSRC
175   KBUILD_CHECKSRC = 0
176 endif
177 
178 # Use make M=dir to specify directory of external module to build
179 # Old syntax make ... SUBDIRS=$PWD is still supported
180 # Setting the environment variable KBUILD_EXTMOD take precedence
181 ifdef SUBDIRS
182   KBUILD_EXTMOD ?= $(SUBDIRS)
183 endif
184 
185 ifeq ("$(origin M)", "command line")
186   KBUILD_EXTMOD := $(M)
187 endif
188 
189 # If building an external module we do not care about the all: rule
190 # but instead _all depend on modules
191 PHONY += all
192 ifeq ($(KBUILD_EXTMOD),)
193 _all: all
194 else
195 _all: modules
196 endif
197 
198 ifeq ($(KBUILD_SRC),)
199         # building in the source tree
200         srctree := .
201 else
202         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
203                 # building in a subdirectory of the source tree
204                 srctree := ..
205         else
206                 srctree := $(KBUILD_SRC)
207         endif
208 endif
209 objtree         := .
210 src             := $(srctree)
211 obj             := $(objtree)
212 
213 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
214 
215 export srctree objtree VPATH
216 
217 
218 # SUBARCH tells the usermode build what the underlying arch is.  That is set
219 # first, and if a usermode build is happening, the "ARCH=um" on the command
220 # line overrides the setting of ARCH below.  If a native build is happening,
221 # then ARCH is assigned, getting whatever value it gets normally, and
222 # SUBARCH is subsequently ignored.
223 
224 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
225                                   -e s/sun4u/sparc64/ \
226                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
227                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
228                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
229                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
230 
231 # Cross compiling and selecting different set of gcc/bin-utils
232 # ---------------------------------------------------------------------------
233 #
234 # When performing cross compilation for other architectures ARCH shall be set
235 # to the target architecture. (See arch/* for the possibilities).
236 # ARCH can be set during invocation of make:
237 # make ARCH=ia64
238 # Another way is to have ARCH set in the environment.
239 # The default ARCH is the host where make is executed.
240 
241 # CROSS_COMPILE specify the prefix used for all executables used
242 # during compilation. Only gcc and related bin-utils executables
243 # are prefixed with $(CROSS_COMPILE).
244 # CROSS_COMPILE can be set on the command line
245 # make CROSS_COMPILE=ia64-linux-
246 # Alternatively CROSS_COMPILE can be set in the environment.
247 # A third alternative is to store a setting in .config so that plain
248 # "make" in the configured kernel build directory always uses that.
249 # Default value for CROSS_COMPILE is not to prefix executables
250 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
251 ARCH            ?= $(SUBARCH)
252 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
253 
254 # Architecture as present in compile.h
255 UTS_MACHINE     := $(ARCH)
256 SRCARCH         := $(ARCH)
257 
258 # Additional ARCH settings for x86
259 ifeq ($(ARCH),i386)
260         SRCARCH := x86
261 endif
262 ifeq ($(ARCH),x86_64)
263         SRCARCH := x86
264 endif
265 
266 # Additional ARCH settings for sparc
267 ifeq ($(ARCH),sparc32)
268        SRCARCH := sparc
269 endif
270 ifeq ($(ARCH),sparc64)
271        SRCARCH := sparc
272 endif
273 
274 # Additional ARCH settings for sh
275 ifeq ($(ARCH),sh64)
276        SRCARCH := sh
277 endif
278 
279 # Additional ARCH settings for tile
280 ifeq ($(ARCH),tilepro)
281        SRCARCH := tile
282 endif
283 ifeq ($(ARCH),tilegx)
284        SRCARCH := tile
285 endif
286 
287 # Where to locate arch specific headers
288 hdr-arch  := $(SRCARCH)
289 
290 KCONFIG_CONFIG  ?= .config
291 export KCONFIG_CONFIG
292 
293 # SHELL used by kbuild
294 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
295           else if [ -x /bin/bash ]; then echo /bin/bash; \
296           else echo sh; fi ; fi)
297 
298 HOSTCC       = gcc
299 HOSTCXX      = g++
300 HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
301 HOSTCXXFLAGS = -O2
302 
303 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
304 HOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
305                 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
306 endif
307 
308 # Decide whether to build built-in, modular, or both.
309 # Normally, just do built-in.
310 
311 KBUILD_MODULES :=
312 KBUILD_BUILTIN := 1
313 
314 # If we have only "make modules", don't compile built-in objects.
315 # When we're building modules with modversions, we need to consider
316 # the built-in objects during the descend as well, in order to
317 # make sure the checksums are up to date before we record them.
318 
319 ifeq ($(MAKECMDGOALS),modules)
320   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
321 endif
322 
323 # If we have "make <whatever> modules", compile modules
324 # in addition to whatever we do anyway.
325 # Just "make" or "make all" shall build modules as well
326 
327 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
328   KBUILD_MODULES := 1
329 endif
330 
331 ifeq ($(MAKECMDGOALS),)
332   KBUILD_MODULES := 1
333 endif
334 
335 export KBUILD_MODULES KBUILD_BUILTIN
336 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
337 
338 ifneq ($(CC),)
339 ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1)
340 COMPILER := clang
341 else
342 COMPILER := gcc
343 endif
344 export COMPILER
345 endif
346 
347 # Look for make include files relative to root of kernel src
348 MAKEFLAGS += --include-dir=$(srctree)
349 
350 # We need some generic definitions (do not try to remake the file).
351 $(srctree)/scripts/Kbuild.include: ;
352 include $(srctree)/scripts/Kbuild.include
353 
354 # Make variables (CC, etc...)
355 AS              = $(CROSS_COMPILE)as
356 LD              = $(CROSS_COMPILE)ld
357 CC              = $(CROSS_COMPILE)gcc
358 CPP             = $(CC) -E
359 AR              = $(CROSS_COMPILE)ar
360 NM              = $(CROSS_COMPILE)nm
361 STRIP           = $(CROSS_COMPILE)strip
362 OBJCOPY         = $(CROSS_COMPILE)objcopy
363 OBJDUMP         = $(CROSS_COMPILE)objdump
364 AWK             = awk
365 GENKSYMS        = scripts/genksyms/genksyms
366 INSTALLKERNEL  := installkernel
367 DEPMOD          = /sbin/depmod
368 PERL            = perl
369 PYTHON          = python
370 CHECK           = sparse
371 
372 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
373                   -Wbitwise -Wno-return-void $(CF)
374 CFLAGS_MODULE   =
375 AFLAGS_MODULE   =
376 LDFLAGS_MODULE  =
377 CFLAGS_KERNEL   =
378 AFLAGS_KERNEL   =
379 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
380 
381 
382 # Use USERINCLUDE when you must reference the UAPI directories only.
383 USERINCLUDE    := \
384                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
385                 -Iarch/$(hdr-arch)/include/generated/uapi \
386                 -I$(srctree)/include/uapi \
387                 -Iinclude/generated/uapi \
388                 -include $(srctree)/include/linux/kconfig.h
389 
390 # Use LINUXINCLUDE when you must reference the include/ directory.
391 # Needed to be compatible with the O= option
392 LINUXINCLUDE    := \
393                 -I$(srctree)/arch/$(hdr-arch)/include \
394                 -Iarch/$(hdr-arch)/include/generated/uapi \
395                 -Iarch/$(hdr-arch)/include/generated \
396                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
397                 -Iinclude \
398                 $(USERINCLUDE)
399 
400 KBUILD_CPPFLAGS := -D__KERNEL__
401 
402 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
403                    -fno-strict-aliasing -fno-common \
404                    -Werror-implicit-function-declaration \
405                    -Wno-format-security \
406                    -std=gnu89
407 
408 KBUILD_AFLAGS_KERNEL :=
409 KBUILD_CFLAGS_KERNEL :=
410 KBUILD_AFLAGS   := -D__ASSEMBLY__
411 KBUILD_AFLAGS_MODULE  := -DMODULE
412 KBUILD_CFLAGS_MODULE  := -DMODULE
413 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
414 
415 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
416 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
417 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
418 
419 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
420 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
421 export CPP AR NM STRIP OBJCOPY OBJDUMP
422 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
423 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
424 
425 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
426 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KASAN
427 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
428 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
429 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
430 export KBUILD_ARFLAGS
431 
432 # When compiling out-of-tree modules, put MODVERDIR in the module
433 # tree rather than in the kernel tree. The kernel tree might
434 # even be read-only.
435 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
436 
437 # Files to ignore in find ... statements
438 
439 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
440                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
441                           -prune -o
442 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
443                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
444 
445 # ===========================================================================
446 # Rules shared between *config targets and build targets
447 
448 # Basic helpers built in scripts/
449 PHONY += scripts_basic
450 scripts_basic:
451         $(Q)$(MAKE) $(build)=scripts/basic
452         $(Q)rm -f .tmp_quiet_recordmcount
453 
454 # To avoid any implicit rule to kick in, define an empty command.
455 scripts/basic/%: scripts_basic ;
456 
457 PHONY += outputmakefile
458 # outputmakefile generates a Makefile in the output directory, if using a
459 # separate output directory. This allows convenient use of make in the
460 # output directory.
461 outputmakefile:
462 ifneq ($(KBUILD_SRC),)
463         $(Q)ln -fsn $(srctree) source
464         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
465             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
466 endif
467 
468 # Support for using generic headers in asm-generic
469 PHONY += asm-generic
470 asm-generic:
471         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
472                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
473         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
474                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
475 
476 # To make sure we do not include .config for any of the *config targets
477 # catch them early, and hand them over to scripts/kconfig/Makefile
478 # It is allowed to specify more targets when calling make, including
479 # mixing *config targets and build targets.
480 # For example 'make oldconfig all'.
481 # Detect when mixed targets is specified, and make a second invocation
482 # of make so .config is not included in this case either (for *config).
483 
484 version_h := include/generated/uapi/linux/version.h
485 old_version_h := include/linux/version.h
486 
487 no-dot-config-targets := clean mrproper distclean \
488                          cscope gtags TAGS tags help% %docs check% coccicheck \
489                          $(version_h) headers_% archheaders archscripts \
490                          kernelversion %src-pkg
491 
492 config-targets := 0
493 mixed-targets  := 0
494 dot-config     := 1
495 
496 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
497         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
498                 dot-config := 0
499         endif
500 endif
501 
502 ifeq ($(KBUILD_EXTMOD),)
503         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
504                 config-targets := 1
505                 ifneq ($(words $(MAKECMDGOALS)),1)
506                         mixed-targets := 1
507                 endif
508         endif
509 endif
510 
511 ifeq ($(mixed-targets),1)
512 # ===========================================================================
513 # We're called with mixed targets (*config and build targets).
514 # Handle them one by one.
515 
516 PHONY += $(MAKECMDGOALS) __build_one_by_one
517 
518 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
519         @:
520 
521 __build_one_by_one:
522         $(Q)set -e; \
523         for i in $(MAKECMDGOALS); do \
524                 $(MAKE) -f $(srctree)/Makefile $$i; \
525         done
526 
527 else
528 ifeq ($(config-targets),1)
529 # ===========================================================================
530 # *config targets only - make sure prerequisites are updated, and descend
531 # in scripts/kconfig to make the *config target
532 
533 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
534 # KBUILD_DEFCONFIG may point out an alternative default configuration
535 # used for 'make defconfig'
536 include $(srctree)/arch/$(SRCARCH)/Makefile
537 export KBUILD_DEFCONFIG KBUILD_KCONFIG
538 
539 config: scripts_basic outputmakefile FORCE
540         $(Q)$(MAKE) $(build)=scripts/kconfig $@
541 
542 %config: scripts_basic outputmakefile FORCE
543         $(Q)$(MAKE) $(build)=scripts/kconfig $@
544 
545 else
546 # ===========================================================================
547 # Build targets only - this includes vmlinux, arch specific targets, clean
548 # targets and others. In general all targets except *config targets.
549 
550 ifeq ($(KBUILD_EXTMOD),)
551 # Additional helpers built in scripts/
552 # Carefully list dependencies so we do not try to build scripts twice
553 # in parallel
554 PHONY += scripts
555 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
556          asm-generic
557         $(Q)$(MAKE) $(build)=$(@)
558 
559 # Objects we will link into vmlinux / subdirs we need to visit
560 init-y          := init/
561 drivers-y       := drivers/ sound/ firmware/
562 net-y           := net/
563 libs-y          := lib/
564 core-y          := usr/
565 endif # KBUILD_EXTMOD
566 
567 ifeq ($(dot-config),1)
568 # Read in config
569 -include include/config/auto.conf
570 
571 ifeq ($(KBUILD_EXTMOD),)
572 # Read in dependencies to all Kconfig* files, make sure to run
573 # oldconfig if changes are detected.
574 -include include/config/auto.conf.cmd
575 
576 # To avoid any implicit rule to kick in, define an empty command
577 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
578 
579 # If .config is newer than include/config/auto.conf, someone tinkered
580 # with it and forgot to run make oldconfig.
581 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
582 # we execute the config step to be sure to catch updated Kconfig files
583 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
584         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
585 else
586 # external modules needs include/generated/autoconf.h and include/config/auto.conf
587 # but do not care if they are up-to-date. Use auto.conf to trigger the test
588 PHONY += include/config/auto.conf
589 
590 include/config/auto.conf:
591         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
592         echo >&2;                                                       \
593         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
594         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
595         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
596         echo >&2 ;                                                      \
597         /bin/false)
598 
599 endif # KBUILD_EXTMOD
600 
601 else
602 # Dummy target needed, because used as prerequisite
603 include/config/auto.conf: ;
604 endif # $(dot-config)
605 
606 # The all: target is the default when no target is given on the
607 # command line.
608 # This allow a user to issue only 'make' to build a kernel including modules
609 # Defaults to vmlinux, but the arch makefile usually adds further targets
610 all: vmlinux
611 
612 include $(srctree)/arch/$(SRCARCH)/Makefile
613 
614 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
615 
616 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
617 KBUILD_CFLAGS   += -Os $(call cc-disable-warning,maybe-uninitialized,)
618 else
619 KBUILD_CFLAGS   += -O2
620 endif
621 
622 # Tell gcc to never replace conditional load with a non-conditional one
623 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
624 
625 ifdef CONFIG_READABLE_ASM
626 # Disable optimizations that make assembler listings hard to read.
627 # reorder blocks reorders the control in the function
628 # ipa clone creates specialized cloned functions
629 # partial inlining inlines only parts of functions
630 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
631                  $(call cc-option,-fno-ipa-cp-clone,) \
632                  $(call cc-option,-fno-partial-inlining)
633 endif
634 
635 ifneq ($(CONFIG_FRAME_WARN),0)
636 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
637 endif
638 
639 # Handle stack protector mode.
640 #
641 # Since kbuild can potentially perform two passes (first with the old
642 # .config values and then with updated .config values), we cannot error out
643 # if a desired compiler option is unsupported. If we were to error, kbuild
644 # could never get to the second pass and actually notice that we changed
645 # the option to something that was supported.
646 #
647 # Additionally, we don't want to fallback and/or silently change which compiler
648 # flags will be used, since that leads to producing kernels with different
649 # security feature characteristics depending on the compiler used. ("But I
650 # selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
651 #
652 # The middle ground is to warn here so that the failed option is obvious, but
653 # to let the build fail with bad compiler flags so that we can't produce a
654 # kernel when there is a CONFIG and compiler mismatch.
655 #
656 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
657   stackp-flag := -fstack-protector
658   ifeq ($(call cc-option, $(stackp-flag)),)
659     $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
660              -fstack-protector not supported by compiler)
661   endif
662 else
663 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
664   stackp-flag := -fstack-protector-strong
665   ifeq ($(call cc-option, $(stackp-flag)),)
666     $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
667               -fstack-protector-strong not supported by compiler)
668   endif
669 else
670   # Force off for distro compilers that enable stack protector by default.
671   stackp-flag := $(call cc-option, -fno-stack-protector)
672 endif
673 endif
674 KBUILD_CFLAGS += $(stackp-flag)
675 
676 ifeq ($(COMPILER),clang)
677 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
678 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
679 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
680 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
681 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
682 # Quiet clang warning: comparison of unsigned expression < 0 is always false
683 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
684 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
685 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
686 # See modpost pattern 2
687 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
688 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
689 else
690 
691 # This warning generated too much noise in a regular build.
692 # Use make W=1 to enable this warning (see scripts/Makefile.build)
693 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
694 endif
695 
696 ifdef CONFIG_FRAME_POINTER
697 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
698 else
699 # Some targets (ARM with Thumb2, for example), can't be built with frame
700 # pointers.  For those, we don't have FUNCTION_TRACER automatically
701 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
702 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
703 # -fomit-frame-pointer with FUNCTION_TRACER.
704 ifndef CONFIG_FUNCTION_TRACER
705 KBUILD_CFLAGS   += -fomit-frame-pointer
706 endif
707 endif
708 
709 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
710 
711 ifdef CONFIG_DEBUG_INFO
712 ifdef CONFIG_DEBUG_INFO_SPLIT
713 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
714 else
715 KBUILD_CFLAGS   += -g
716 endif
717 KBUILD_AFLAGS   += -Wa,-gdwarf-2
718 endif
719 ifdef CONFIG_DEBUG_INFO_DWARF4
720 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
721 endif
722 
723 ifdef CONFIG_DEBUG_INFO_REDUCED
724 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
725                    $(call cc-option,-fno-var-tracking)
726 endif
727 
728 ifdef CONFIG_FUNCTION_TRACER
729 ifndef CC_FLAGS_FTRACE
730 CC_FLAGS_FTRACE := -pg
731 endif
732 export CC_FLAGS_FTRACE
733 ifdef CONFIG_HAVE_FENTRY
734 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
735 endif
736 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
737 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
738 ifdef CONFIG_DYNAMIC_FTRACE
739         ifdef CONFIG_HAVE_C_RECORDMCOUNT
740                 BUILD_C_RECORDMCOUNT := y
741                 export BUILD_C_RECORDMCOUNT
742         endif
743 endif
744 endif
745 
746 # We trigger additional mismatches with less inlining
747 ifdef CONFIG_DEBUG_SECTION_MISMATCH
748 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
749 endif
750 
751 # arch Makefile may override CC so keep this after arch Makefile is included
752 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
753 CHECKFLAGS     += $(NOSTDINC_FLAGS)
754 
755 # warn about C99 declaration after statement
756 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
757 
758 # disable pointer signed / unsigned warnings in gcc 4.0
759 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
760 
761 # disable invalid "can't wrap" optimizations for signed / pointers
762 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
763 
764 # conserve stack if available
765 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
766 
767 # disallow errors like 'EXPORT_GPL(foo);' with missing header
768 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
769 
770 # require functions to have arguments in prototypes, not empty 'int foo()'
771 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
772 
773 # Prohibit date/time macros, which would make the build non-deterministic
774 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
775 
776 # use the deterministic mode of AR if available
777 KBUILD_ARFLAGS := $(call ar-option,D)
778 
779 # check for 'asm goto'
780 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
781         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
782 endif
783 
784 include $(srctree)/scripts/Makefile.kasan
785 include $(srctree)/scripts/Makefile.extrawarn
786 
787 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
788 KBUILD_CPPFLAGS += $(KCPPFLAGS)
789 KBUILD_AFLAGS += $(KAFLAGS)
790 KBUILD_CFLAGS += $(KCFLAGS)
791 
792 # Use --build-id when available.
793 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
794                               $(call cc-ldoption, -Wl$(comma)--build-id,))
795 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
796 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
797 
798 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
799 LDFLAGS_vmlinux += $(call ld-option, -X,)
800 endif
801 
802 # Default kernel image to build when no specific target is given.
803 # KBUILD_IMAGE may be overruled on the command line or
804 # set in the environment
805 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
806 # this default value
807 export KBUILD_IMAGE ?= vmlinux
808 
809 #
810 # INSTALL_PATH specifies where to place the updated kernel and system map
811 # images. Default is /boot, but you can set it to other values
812 export  INSTALL_PATH ?= /boot
813 
814 #
815 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
816 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
817 # an argument if needed. Otherwise it defaults to the kernel install path
818 #
819 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
820 
821 #
822 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
823 # relocations required by build roots.  This is not defined in the
824 # makefile but the argument can be passed to make if needed.
825 #
826 
827 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
828 export MODLIB
829 
830 #
831 # INSTALL_MOD_STRIP, if defined, will cause modules to be
832 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
833 # the default option --strip-debug will be used.  Otherwise,
834 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
835 
836 ifdef INSTALL_MOD_STRIP
837 ifeq ($(INSTALL_MOD_STRIP),1)
838 mod_strip_cmd = $(STRIP) --strip-debug
839 else
840 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
841 endif # INSTALL_MOD_STRIP=1
842 else
843 mod_strip_cmd = true
844 endif # INSTALL_MOD_STRIP
845 export mod_strip_cmd
846 
847 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
848 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
849 # or CONFIG_MODULE_COMPRESS_XZ.
850 
851 mod_compress_cmd = true
852 ifdef CONFIG_MODULE_COMPRESS
853   ifdef CONFIG_MODULE_COMPRESS_GZIP
854     mod_compress_cmd = gzip -n
855   endif # CONFIG_MODULE_COMPRESS_GZIP
856   ifdef CONFIG_MODULE_COMPRESS_XZ
857     mod_compress_cmd = xz
858   endif # CONFIG_MODULE_COMPRESS_XZ
859 endif # CONFIG_MODULE_COMPRESS
860 export mod_compress_cmd
861 
862 # Select initial ramdisk compression format, default is gzip(1).
863 # This shall be used by the dracut(8) tool while creating an initramfs image.
864 #
865 INITRD_COMPRESS-y                  := gzip
866 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
867 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
868 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
869 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
870 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
871 # do not export INITRD_COMPRESS, since we didn't actually
872 # choose a sane default compression above.
873 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
874 
875 ifdef CONFIG_MODULE_SIG_ALL
876 MODSECKEY = ./signing_key.priv
877 MODPUBKEY = ./signing_key.x509
878 export MODPUBKEY
879 mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
880 else
881 mod_sign_cmd = true
882 endif
883 export mod_sign_cmd
884 
885 
886 ifeq ($(KBUILD_EXTMOD),)
887 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
888 
889 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
890                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
891                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
892 
893 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
894                      $(init-) $(core-) $(drivers-) $(net-) $(libs-))))
895 
896 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
897 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
898 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
899 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
900 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
901 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
902 libs-y          := $(libs-y1) $(libs-y2)
903 
904 # Externally visible symbols (used by link-vmlinux.sh)
905 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
906 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
907 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
908 export LDFLAGS_vmlinux
909 # used by scripts/pacmage/Makefile
910 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
911 
912 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
913 
914 # Final link of vmlinux
915       cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
916 quiet_cmd_link-vmlinux = LINK    $@
917 
918 # Include targets which we want to
919 # execute if the rest of the kernel build went well.
920 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
921 ifdef CONFIG_HEADERS_CHECK
922         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
923 endif
924 ifdef CONFIG_SAMPLES
925         $(Q)$(MAKE) $(build)=samples
926 endif
927 ifdef CONFIG_BUILD_DOCSRC
928         $(Q)$(MAKE) $(build)=Documentation
929 endif
930 ifdef CONFIG_GDB_SCRIPTS
931         $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
932 endif
933         +$(call if_changed,link-vmlinux)
934 
935 # The actual objects are generated when descending,
936 # make sure no implicit rule kicks in
937 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
938 
939 # Handle descending into subdirectories listed in $(vmlinux-dirs)
940 # Preset locale variables to speed up the build process. Limit locale
941 # tweaks to this spot to avoid wrong language settings when running
942 # make menuconfig etc.
943 # Error messages still appears in the original language
944 
945 PHONY += $(vmlinux-dirs)
946 $(vmlinux-dirs): prepare scripts
947         $(Q)$(MAKE) $(build)=$@
948 
949 define filechk_kernel.release
950         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
951 endef
952 
953 # Store (new) KERNELRELEASE string in include/config/kernel.release
954 include/config/kernel.release: include/config/auto.conf FORCE
955         $(call filechk,kernel.release)
956 
957 
958 # Things we need to do before we recursively start building the kernel
959 # or the modules are listed in "prepare".
960 # A multi level approach is used. prepareN is processed before prepareN-1.
961 # archprepare is used in arch Makefiles and when processed asm symlink,
962 # version.h and scripts_basic is processed / created.
963 
964 # Listed in dependency order
965 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
966 
967 # prepare3 is used to check if we are building in a separate output directory,
968 # and if so do:
969 # 1) Check that make has not been executed in the kernel src $(srctree)
970 prepare3: include/config/kernel.release
971 ifneq ($(KBUILD_SRC),)
972         @$(kecho) '  Using $(srctree) as source for kernel'
973         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
974                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
975                 echo >&2 "  in the '$(srctree)' directory.";\
976                 /bin/false; \
977         fi;
978 endif
979 
980 # prepare2 creates a makefile if using a separate output directory
981 prepare2: prepare3 outputmakefile asm-generic
982 
983 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
984                    include/config/auto.conf
985         $(cmd_crmodverdir)
986 
987 archprepare: archheaders archscripts prepare1 scripts_basic
988 
989 prepare0: archprepare FORCE
990         $(Q)$(MAKE) $(build)=.
991 
992 # All the preparing..
993 prepare: prepare0
994 
995 # Generate some files
996 # ---------------------------------------------------------------------------
997 
998 # KERNELRELEASE can change from a few different places, meaning version.h
999 # needs to be updated, so this check is forced on all builds
1000 
1001 uts_len := 64
1002 define filechk_utsrelease.h
1003         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1004           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1005           exit 1;                                                         \
1006         fi;                                                               \
1007         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1008 endef
1009 
1010 define filechk_version.h
1011         (echo \#define LINUX_VERSION_CODE $(shell                         \
1012         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1013         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1014 endef
1015 
1016 $(version_h): $(srctree)/Makefile FORCE
1017         $(call filechk,version.h)
1018         $(Q)rm -f $(old_version_h)
1019 
1020 include/generated/utsrelease.h: include/config/kernel.release FORCE
1021         $(call filechk,utsrelease.h)
1022 
1023 PHONY += headerdep
1024 headerdep:
1025         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1026         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1027 
1028 # ---------------------------------------------------------------------------
1029 
1030 PHONY += depend dep
1031 depend dep:
1032         @echo '*** Warning: make $@ is unnecessary now.'
1033 
1034 # ---------------------------------------------------------------------------
1035 # Firmware install
1036 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1037 export INSTALL_FW_PATH
1038 
1039 PHONY += firmware_install
1040 firmware_install: FORCE
1041         @mkdir -p $(objtree)/firmware
1042         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1043 
1044 # ---------------------------------------------------------------------------
1045 # Kernel headers
1046 
1047 #Default location for installed headers
1048 export INSTALL_HDR_PATH = $(objtree)/usr
1049 
1050 # If we do an all arch process set dst to asm-$(hdr-arch)
1051 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1052 
1053 PHONY += archheaders
1054 archheaders:
1055 
1056 PHONY += archscripts
1057 archscripts:
1058 
1059 PHONY += __headers
1060 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1061         $(Q)$(MAKE) $(build)=scripts build_unifdef
1062 
1063 PHONY += headers_install_all
1064 headers_install_all:
1065         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1066 
1067 PHONY += headers_install
1068 headers_install: __headers
1069         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1070           $(error Headers not exportable for the $(SRCARCH) architecture))
1071         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1072         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1073 
1074 PHONY += headers_check_all
1075 headers_check_all: headers_install_all
1076         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1077 
1078 PHONY += headers_check
1079 headers_check: headers_install
1080         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1081         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1082 
1083 # ---------------------------------------------------------------------------
1084 # Kernel selftest
1085 
1086 PHONY += kselftest
1087 kselftest:
1088         $(Q)$(MAKE) -C tools/testing/selftests run_tests
1089 
1090 # ---------------------------------------------------------------------------
1091 # Modules
1092 
1093 ifdef CONFIG_MODULES
1094 
1095 # By default, build modules as well
1096 
1097 all: modules
1098 
1099 # Build modules
1100 #
1101 # A module can be listed more than once in obj-m resulting in
1102 # duplicate lines in modules.order files.  Those are removed
1103 # using awk while concatenating to the final file.
1104 
1105 PHONY += modules
1106 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1107         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1108         @$(kecho) '  Building modules, stage 2.';
1109         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1110         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1111 
1112 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1113         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1114 
1115 %/modules.builtin: include/config/auto.conf
1116         $(Q)$(MAKE) $(modbuiltin)=$*
1117 
1118 
1119 # Target to prepare building external modules
1120 PHONY += modules_prepare
1121 modules_prepare: prepare scripts
1122 
1123 # Target to install modules
1124 PHONY += modules_install
1125 modules_install: _modinst_ _modinst_post
1126 
1127 PHONY += _modinst_
1128 _modinst_:
1129         @rm -rf $(MODLIB)/kernel
1130         @rm -f $(MODLIB)/source
1131         @mkdir -p $(MODLIB)/kernel
1132         @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1133         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1134                 rm -f $(MODLIB)/build ; \
1135                 ln -s $(CURDIR) $(MODLIB)/build ; \
1136         fi
1137         @cp -f $(objtree)/modules.order $(MODLIB)/
1138         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1139         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1140 
1141 # This depmod is only for convenience to give the initial
1142 # boot a modules.dep even before / is mounted read-write.  However the
1143 # boot script depmod is the master version.
1144 PHONY += _modinst_post
1145 _modinst_post: _modinst_
1146         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1147         $(call cmd,depmod)
1148 
1149 ifeq ($(CONFIG_MODULE_SIG), y)
1150 PHONY += modules_sign
1151 modules_sign:
1152         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1153 endif
1154 
1155 else # CONFIG_MODULES
1156 
1157 # Modules not configured
1158 # ---------------------------------------------------------------------------
1159 
1160 modules modules_install: FORCE
1161         @echo >&2
1162         @echo >&2 "The present kernel configuration has modules disabled."
1163         @echo >&2 "Type 'make config' and enable loadable module support."
1164         @echo >&2 "Then build a kernel with module support enabled."
1165         @echo >&2
1166         @exit 1
1167 
1168 endif # CONFIG_MODULES
1169 
1170 ###
1171 # Cleaning is done on three levels.
1172 # make clean     Delete most generated files
1173 #                Leave enough to build external modules
1174 # make mrproper  Delete the current configuration, and all generated files
1175 # make distclean Remove editor backup files, patch leftover files and the like
1176 
1177 # Directories & files removed with 'make clean'
1178 CLEAN_DIRS  += $(MODVERDIR)
1179 
1180 # Directories & files removed with 'make mrproper'
1181 MRPROPER_DIRS  += include/config usr/include include/generated          \
1182                   arch/*/include/generated .tmp_objdiff
1183 MRPROPER_FILES += .config .config.old .version .old_version \
1184                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1185                   signing_key.priv signing_key.x509 x509.genkey         \
1186                   extra_certificates signing_key.x509.keyid             \
1187                   signing_key.x509.signer vmlinux-gdb.py
1188 
1189 # clean - Delete most, but leave enough to build external modules
1190 #
1191 clean: rm-dirs  := $(CLEAN_DIRS)
1192 clean: rm-files := $(CLEAN_FILES)
1193 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1194 
1195 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1196 $(clean-dirs):
1197         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1198 
1199 vmlinuxclean:
1200         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1201 
1202 clean: archclean vmlinuxclean
1203 
1204 # mrproper - Delete all generated files, including .config
1205 #
1206 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1207 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1208 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1209 
1210 PHONY += $(mrproper-dirs) mrproper archmrproper
1211 $(mrproper-dirs):
1212         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1213 
1214 mrproper: clean archmrproper $(mrproper-dirs)
1215         $(call cmd,rmdirs)
1216         $(call cmd,rmfiles)
1217 
1218 # distclean
1219 #
1220 PHONY += distclean
1221 
1222 distclean: mrproper
1223         @find $(srctree) $(RCS_FIND_IGNORE) \
1224                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1225                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1226                 -o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
1227                 -type f -print | xargs rm -f
1228 
1229 
1230 # Packaging of the kernel to various formats
1231 # ---------------------------------------------------------------------------
1232 # rpm target kept for backward compatibility
1233 package-dir     := scripts/package
1234 
1235 %src-pkg: FORCE
1236         $(Q)$(MAKE) $(build)=$(package-dir) $@
1237 %pkg: include/config/kernel.release FORCE
1238         $(Q)$(MAKE) $(build)=$(package-dir) $@
1239 rpm: include/config/kernel.release FORCE
1240         $(Q)$(MAKE) $(build)=$(package-dir) $@
1241 
1242 
1243 # Brief documentation of the typical targets used
1244 # ---------------------------------------------------------------------------
1245 
1246 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1247 boards := $(sort $(notdir $(boards)))
1248 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1249 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1250 
1251 help:
1252         @echo  'Cleaning targets:'
1253         @echo  '  clean           - Remove most generated files but keep the config and'
1254         @echo  '                    enough build support to build external modules'
1255         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1256         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1257         @echo  ''
1258         @echo  'Configuration targets:'
1259         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1260         @echo  ''
1261         @echo  'Other generic targets:'
1262         @echo  '  all             - Build all targets marked with [*]'
1263         @echo  '* vmlinux         - Build the bare kernel'
1264         @echo  '* modules         - Build all modules'
1265         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1266         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1267         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1268         @echo  '  dir/            - Build all files in dir and below'
1269         @echo  '  dir/file.[oisS] - Build specified target only'
1270         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1271         @echo  '                    (requires a recent binutils and recent build (System.map))'
1272         @echo  '  dir/file.ko     - Build module including final link'
1273         @echo  '  modules_prepare - Set up for building external modules'
1274         @echo  '  tags/TAGS       - Generate tags file for editors'
1275         @echo  '  cscope          - Generate cscope index'
1276         @echo  '  gtags           - Generate GNU GLOBAL index'
1277         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1278         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1279         @echo  '  image_name      - Output the image name (use with make -s)'
1280         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1281          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1282          echo  ''
1283         @echo  'Static analysers'
1284         @echo  '  checkstack      - Generate a list of stack hogs'
1285         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1286         @echo  '  versioncheck    - Sanity check on version.h usage'
1287         @echo  '  includecheck    - Check for duplicate included header files'
1288         @echo  '  export_report   - List the usages of all exported symbols'
1289         @echo  '  headers_check   - Sanity check on exported headers'
1290         @echo  '  headerdep       - Detect inclusion cycles in headers'
1291         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1292         @echo  ''
1293         @echo  'Kernel selftest'
1294         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1295         @echo  '                    Build, install, and boot kernel before'
1296         @echo  '                    running kselftest on it'
1297         @echo  ''
1298         @echo  'Kernel packaging:'
1299         @$(MAKE) $(build)=$(package-dir) help
1300         @echo  ''
1301         @echo  'Documentation targets:'
1302         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1303         @echo  ''
1304         @echo  'Architecture specific targets ($(SRCARCH)):'
1305         @$(if $(archhelp),$(archhelp),\
1306                 echo '  No architecture specific help defined for $(SRCARCH)')
1307         @echo  ''
1308         @$(if $(boards), \
1309                 $(foreach b, $(boards), \
1310                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1311                 echo '')
1312         @$(if $(board-dirs), \
1313                 $(foreach b, $(board-dirs), \
1314                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1315                 printf "  %-16s - Show all of the above\\n" help-boards; \
1316                 echo '')
1317 
1318         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1319         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1320         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1321         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1322         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1323         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1324         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1325         @echo  '                1: warnings which may be relevant and do not occur too often'
1326         @echo  '                2: warnings which occur quite often but may still be relevant'
1327         @echo  '                3: more obscure warnings, can most likely be ignored'
1328         @echo  '                Multiple levels can be combined with W=12 or W=123'
1329         @echo  ''
1330         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1331         @echo  'For further info see the ./README file'
1332 
1333 
1334 help-board-dirs := $(addprefix help-,$(board-dirs))
1335 
1336 help-boards: $(help-board-dirs)
1337 
1338 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1339 
1340 $(help-board-dirs): help-%:
1341         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1342         @$(if $(boards-per-dir), \
1343                 $(foreach b, $(boards-per-dir), \
1344                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1345                 echo '')
1346 
1347 
1348 # Documentation targets
1349 # ---------------------------------------------------------------------------
1350 %docs: scripts_basic FORCE
1351         $(Q)$(MAKE) $(build)=scripts build_docproc
1352         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1353 
1354 else # KBUILD_EXTMOD
1355 
1356 ###
1357 # External module support.
1358 # When building external modules the kernel used as basis is considered
1359 # read-only, and no consistency checks are made and the make
1360 # system is not used on the basis kernel. If updates are required
1361 # in the basis kernel ordinary make commands (without M=...) must
1362 # be used.
1363 #
1364 # The following are the only valid targets when building external
1365 # modules.
1366 # make M=dir clean     Delete all automatically generated files
1367 # make M=dir modules   Make all modules in specified dir
1368 # make M=dir           Same as 'make M=dir modules'
1369 # make M=dir modules_install
1370 #                      Install the modules built in the module directory
1371 #                      Assumes install directory is already created
1372 
1373 # We are always building modules
1374 KBUILD_MODULES := 1
1375 PHONY += crmodverdir
1376 crmodverdir:
1377         $(cmd_crmodverdir)
1378 
1379 PHONY += $(objtree)/Module.symvers
1380 $(objtree)/Module.symvers:
1381         @test -e $(objtree)/Module.symvers || ( \
1382         echo; \
1383         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1384         echo "           is missing; modules will have no dependencies and modversions."; \
1385         echo )
1386 
1387 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1388 PHONY += $(module-dirs) modules
1389 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1390         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1391 
1392 modules: $(module-dirs)
1393         @$(kecho) '  Building modules, stage 2.';
1394         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1395 
1396 PHONY += modules_install
1397 modules_install: _emodinst_ _emodinst_post
1398 
1399 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1400 PHONY += _emodinst_
1401 _emodinst_:
1402         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1403         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1404 
1405 PHONY += _emodinst_post
1406 _emodinst_post: _emodinst_
1407         $(call cmd,depmod)
1408 
1409 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1410 
1411 PHONY += $(clean-dirs) clean
1412 $(clean-dirs):
1413         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1414 
1415 clean:  rm-dirs := $(MODVERDIR)
1416 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1417 
1418 help:
1419         @echo  '  Building external modules.'
1420         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1421         @echo  ''
1422         @echo  '  modules         - default target, build the module(s)'
1423         @echo  '  modules_install - install the module'
1424         @echo  '  clean           - remove generated files in module directory only'
1425         @echo  ''
1426 
1427 # Dummies...
1428 PHONY += prepare scripts
1429 prepare: ;
1430 scripts: ;
1431 endif # KBUILD_EXTMOD
1432 
1433 clean: $(clean-dirs)
1434         $(call cmd,rmdirs)
1435         $(call cmd,rmfiles)
1436         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1437                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1438                 -o -name '*.ko.*' \
1439                 -o -name '*.dwo'  \
1440                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1441                 -o -name '*.symtypes' -o -name 'modules.order' \
1442                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1443                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1444 
1445 # Generate tags for editors
1446 # ---------------------------------------------------------------------------
1447 quiet_cmd_tags = GEN     $@
1448       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1449 
1450 tags TAGS cscope gtags: FORCE
1451         $(call cmd,tags)
1452 
1453 # Scripts to check various things for consistency
1454 # ---------------------------------------------------------------------------
1455 
1456 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1457 
1458 includecheck:
1459         find $(srctree)/* $(RCS_FIND_IGNORE) \
1460                 -name '*.[hcS]' -type f -print | sort \
1461                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1462 
1463 versioncheck:
1464         find $(srctree)/* $(RCS_FIND_IGNORE) \
1465                 -name '*.[hcS]' -type f -print | sort \
1466                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1467 
1468 coccicheck:
1469         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1470 
1471 namespacecheck:
1472         $(PERL) $(srctree)/scripts/namespace.pl
1473 
1474 export_report:
1475         $(PERL) $(srctree)/scripts/export_report.pl
1476 
1477 endif #ifeq ($(config-targets),1)
1478 endif #ifeq ($(mixed-targets),1)
1479 
1480 PHONY += checkstack kernelrelease kernelversion image_name
1481 
1482 # UML needs a little special treatment here.  It wants to use the host
1483 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1484 # else wants $(ARCH), including people doing cross-builds, which means
1485 # that $(SUBARCH) doesn't work here.
1486 ifeq ($(ARCH), um)
1487 CHECKSTACK_ARCH := $(SUBARCH)
1488 else
1489 CHECKSTACK_ARCH := $(ARCH)
1490 endif
1491 checkstack:
1492         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1493         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1494 
1495 kernelrelease:
1496         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1497 
1498 kernelversion:
1499         @echo $(KERNELVERSION)
1500 
1501 image_name:
1502         @echo $(KBUILD_IMAGE)
1503 
1504 # Clear a bunch of variables before executing the submake
1505 tools/: FORCE
1506         $(Q)mkdir -p $(objtree)/tools
1507         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1508 
1509 tools/%: FORCE
1510         $(Q)mkdir -p $(objtree)/tools
1511         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1512 
1513 # Single targets
1514 # ---------------------------------------------------------------------------
1515 # Single targets are compatible with:
1516 # - build with mixed source and output
1517 # - build with separate output dir 'make O=...'
1518 # - external modules
1519 #
1520 #  target-dir => where to store outputfile
1521 #  build-dir  => directory in kernel source tree to use
1522 
1523 ifeq ($(KBUILD_EXTMOD),)
1524         build-dir  = $(patsubst %/,%,$(dir $@))
1525         target-dir = $(dir $@)
1526 else
1527         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1528         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1529         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1530 endif
1531 
1532 %.s: %.c prepare scripts FORCE
1533         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1534 %.i: %.c prepare scripts FORCE
1535         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1536 %.o: %.c prepare scripts FORCE
1537         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1538 %.lst: %.c prepare scripts FORCE
1539         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1540 %.s: %.S prepare scripts FORCE
1541         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1542 %.o: %.S prepare scripts FORCE
1543         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1544 %.symtypes: %.c prepare scripts FORCE
1545         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1546 
1547 # Modules
1548 /: prepare scripts FORCE
1549         $(cmd_crmodverdir)
1550         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1551         $(build)=$(build-dir)
1552 # Make sure the latest headers are built for Documentation
1553 Documentation/: headers_install
1554 %/: prepare scripts FORCE
1555         $(cmd_crmodverdir)
1556         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1557         $(build)=$(build-dir)
1558 %.ko: prepare scripts FORCE
1559         $(cmd_crmodverdir)
1560         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1561         $(build)=$(build-dir) $(@:.ko=.o)
1562         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1563 
1564 # FIXME Should go into a make.lib or something
1565 # ===========================================================================
1566 
1567 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1568       cmd_rmdirs = rm -rf $(rm-dirs)
1569 
1570 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1571       cmd_rmfiles = rm -f $(rm-files)
1572 
1573 # Run depmod only if we have System.map and depmod is executable
1574 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1575       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1576                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1577 
1578 # Create temporary dir for module support files
1579 # clean it up only when building all modules
1580 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1581                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1582 
1583 # read all saved command lines
1584 
1585 targets := $(wildcard $(sort $(targets)))
1586 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1587 
1588 ifneq ($(cmd_files),)
1589   $(cmd_files): ;       # Do not try to update included dependency files
1590   include $(cmd_files)
1591 endif
1592 
1593 endif   # skip-makefile
1594 
1595 PHONY += FORCE
1596 FORCE:
1597 
1598 # Declare the contents of the .PHONY variable as phony.  We keep that
1599 # information in a variable so we can use it in if_changed and friends.
1600 .PHONY: $(PHONY)

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