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 = 1
  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 # o Do not use make's built-in rules and variables
 14 #   (this increases performance and avoids hard-to-debug behaviour);
 15 # o Look for make include files relative to root of kernel src
 16 MAKEFLAGS += -rR --include-dir=$(CURDIR)
 17 
 18 # Avoid funny character set dependencies
 19 unexport LC_ALL
 20 LC_COLLATE=C
 21 LC_NUMERIC=C
 22 export LC_COLLATE LC_NUMERIC
 23 
 24 # Avoid interference with shell env settings
 25 unexport GREP_OPTIONS
 26 
 27 # We are using a recursive build, so we need to do a little thinking
 28 # to get the ordering right.
 29 #
 30 # Most importantly: sub-Makefiles should only ever modify files in
 31 # their own directory. If in some directory we have a dependency on
 32 # a file in another dir (which doesn't happen often, but it's often
 33 # unavoidable when linking the built-in.o targets which finally
 34 # turn into vmlinux), we will call a sub make in that other dir, and
 35 # after that we are sure that everything which is in that other dir
 36 # is now up to date.
 37 #
 38 # The only cases where we need to modify files which have global
 39 # effects are thus separated out and done before the recursive
 40 # descending is started. They are now explicitly listed as the
 41 # prepare rule.
 42 
 43 # Beautify output
 44 # ---------------------------------------------------------------------------
 45 #
 46 # Normally, we echo the whole command before executing it. By making
 47 # that echo $($(quiet)$(cmd)), we now have the possibility to set
 48 # $(quiet) to choose other forms of output instead, e.g.
 49 #
 50 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
 51 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 52 #
 53 # If $(quiet) is empty, the whole command will be printed.
 54 # If it is set to "quiet_", only the short version will be printed.
 55 # If it is set to "silent_", nothing will be printed at all, since
 56 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 57 #
 58 # A simple variant is to prefix commands with $(Q) - that's useful
 59 # for commands that shall be hidden in non-verbose mode.
 60 #
 61 #       $(Q)ln $@ :<
 62 #
 63 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
 64 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
 65 #
 66 # To put more focus on warnings, be less verbose as default
 67 # Use 'make V=1' to see the full commands
 68 
 69 ifeq ("$(origin V)", "command line")
 70   KBUILD_VERBOSE = $(V)
 71 endif
 72 ifndef KBUILD_VERBOSE
 73   KBUILD_VERBOSE = 0
 74 endif
 75 
 76 ifeq ($(KBUILD_VERBOSE),1)
 77   quiet =
 78   Q =
 79 else
 80   quiet=quiet_
 81   Q = @
 82 endif
 83 
 84 # If the user is running make -s (silent mode), suppress echoing of
 85 # commands
 86 
 87 ifneq ($(filter 4.%,$(MAKE_VERSION)),)  # make-4
 88 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
 89   quiet=silent_
 90 endif
 91 else                                    # make-3.8x
 92 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
 93   quiet=silent_
 94 endif
 95 endif
 96 
 97 export quiet Q KBUILD_VERBOSE
 98 
 99 # kbuild supports saving output files in a separate directory.
100 # To locate output files in a separate directory two syntaxes are supported.
101 # In both cases the working directory must be the root of the kernel src.
102 # 1) O=
103 # Use "make O=dir/to/store/output/files/"
104 #
105 # 2) Set KBUILD_OUTPUT
106 # Set the environment variable KBUILD_OUTPUT to point to the directory
107 # where the output files shall be placed.
108 # export KBUILD_OUTPUT=dir/to/store/output/files/
109 # make
110 #
111 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
112 # variable.
113 
114 # KBUILD_SRC is set on invocation of make in OBJ directory
115 # KBUILD_SRC is not intended to be used by the regular user (for now)
116 ifeq ($(KBUILD_SRC),)
117 
118 # OK, Make called in directory where kernel src resides
119 # Do we want to locate output files in a separate directory?
120 ifeq ("$(origin O)", "command line")
121   KBUILD_OUTPUT := $(O)
122 endif
123 
124 # That's our default target when none is given on the command line
125 PHONY := _all
126 _all:
127 
128 # Cancel implicit rules on top Makefile
129 $(CURDIR)/Makefile Makefile: ;
130 
131 ifneq ($(KBUILD_OUTPUT),)
132 # Invoke a second make in the output directory, passing relevant variables
133 # check that the output directory actually exists
134 saved-output := $(KBUILD_OUTPUT)
135 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
136                                                                 && /bin/pwd)
137 $(if $(KBUILD_OUTPUT),, \
138      $(error failed to create output directory "$(saved-output)"))
139 
140 PHONY += $(MAKECMDGOALS) sub-make
141 
142 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
143         @:
144 
145 sub-make: FORCE
146         $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
147         -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
148 
149 # Leave processing to above invocation of make
150 skip-makefile := 1
151 endif # ifneq ($(KBUILD_OUTPUT),)
152 endif # ifeq ($(KBUILD_SRC),)
153 
154 # We process the rest of the Makefile if this is the final invocation of make
155 ifeq ($(skip-makefile),)
156 
157 # Do not print "Entering directory ...",
158 # but we want to display it when entering to the output directory
159 # so that IDEs/editors are able to understand relative filenames.
160 MAKEFLAGS += --no-print-directory
161 
162 # Call a source code checker (by default, "sparse") as part of the
163 # C compilation.
164 #
165 # Use 'make C=1' to enable checking of only re-compiled files.
166 # Use 'make C=2' to enable checking of *all* source files, regardless
167 # of whether they are re-compiled or not.
168 #
169 # See the file "Documentation/sparse.txt" for more details, including
170 # where to get the "sparse" utility.
171 
172 ifeq ("$(origin C)", "command line")
173   KBUILD_CHECKSRC = $(C)
174 endif
175 ifndef KBUILD_CHECKSRC
176   KBUILD_CHECKSRC = 0
177 endif
178 
179 # Use make M=dir to specify directory of external module to build
180 # Old syntax make ... SUBDIRS=$PWD is still supported
181 # Setting the environment variable KBUILD_EXTMOD take precedence
182 ifdef SUBDIRS
183   KBUILD_EXTMOD ?= $(SUBDIRS)
184 endif
185 
186 ifeq ("$(origin M)", "command line")
187   KBUILD_EXTMOD := $(M)
188 endif
189 
190 # If building an external module we do not care about the all: rule
191 # but instead _all depend on modules
192 PHONY += all
193 ifeq ($(KBUILD_EXTMOD),)
194 _all: all
195 else
196 _all: modules
197 endif
198 
199 ifeq ($(KBUILD_SRC),)
200         # building in the source tree
201         srctree := .
202 else
203         ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
204                 # building in a subdirectory of the source tree
205                 srctree := ..
206         else
207                 srctree := $(KBUILD_SRC)
208         endif
209 endif
210 objtree         := .
211 src             := $(srctree)
212 obj             := $(objtree)
213 
214 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
215 
216 export srctree objtree VPATH
217 
218 
219 # SUBARCH tells the usermode build what the underlying arch is.  That is set
220 # first, and if a usermode build is happening, the "ARCH=um" on the command
221 # line overrides the setting of ARCH below.  If a native build is happening,
222 # then ARCH is assigned, getting whatever value it gets normally, and
223 # SUBARCH is subsequently ignored.
224 
225 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
226                                   -e s/sun4u/sparc64/ \
227                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
228                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
229                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
230                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
231 
232 # Cross compiling and selecting different set of gcc/bin-utils
233 # ---------------------------------------------------------------------------
234 #
235 # When performing cross compilation for other architectures ARCH shall be set
236 # to the target architecture. (See arch/* for the possibilities).
237 # ARCH can be set during invocation of make:
238 # make ARCH=ia64
239 # Another way is to have ARCH set in the environment.
240 # The default ARCH is the host where make is executed.
241 
242 # CROSS_COMPILE specify the prefix used for all executables used
243 # during compilation. Only gcc and related bin-utils executables
244 # are prefixed with $(CROSS_COMPILE).
245 # CROSS_COMPILE can be set on the command line
246 # make CROSS_COMPILE=ia64-linux-
247 # Alternatively CROSS_COMPILE can be set in the environment.
248 # A third alternative is to store a setting in .config so that plain
249 # "make" in the configured kernel build directory always uses that.
250 # Default value for CROSS_COMPILE is not to prefix executables
251 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
252 ARCH            ?= $(SUBARCH)
253 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
254 
255 # Architecture as present in compile.h
256 UTS_MACHINE     := $(ARCH)
257 SRCARCH         := $(ARCH)
258 
259 # Additional ARCH settings for x86
260 ifeq ($(ARCH),i386)
261         SRCARCH := x86
262 endif
263 ifeq ($(ARCH),x86_64)
264         SRCARCH := x86
265 endif
266 
267 # Additional ARCH settings for sparc
268 ifeq ($(ARCH),sparc32)
269        SRCARCH := sparc
270 endif
271 ifeq ($(ARCH),sparc64)
272        SRCARCH := sparc
273 endif
274 
275 # Additional ARCH settings for sh
276 ifeq ($(ARCH),sh64)
277        SRCARCH := sh
278 endif
279 
280 # Additional ARCH settings for tile
281 ifeq ($(ARCH),tilepro)
282        SRCARCH := tile
283 endif
284 ifeq ($(ARCH),tilegx)
285        SRCARCH := tile
286 endif
287 
288 # Where to locate arch specific headers
289 hdr-arch  := $(SRCARCH)
290 
291 KCONFIG_CONFIG  ?= .config
292 export KCONFIG_CONFIG
293 
294 # SHELL used by kbuild
295 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
296           else if [ -x /bin/bash ]; then echo /bin/bash; \
297           else echo sh; fi ; fi)
298 
299 HOSTCC       = gcc
300 HOSTCXX      = g++
301 HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
302 HOSTCXXFLAGS = -O2
303 
304 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
305 HOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
306                 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
307 endif
308 
309 # Decide whether to build built-in, modular, or both.
310 # Normally, just do built-in.
311 
312 KBUILD_MODULES :=
313 KBUILD_BUILTIN := 1
314 
315 # If we have only "make modules", don't compile built-in objects.
316 # When we're building modules with modversions, we need to consider
317 # the built-in objects during the descend as well, in order to
318 # make sure the checksums are up to date before we record them.
319 
320 ifeq ($(MAKECMDGOALS),modules)
321   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
322 endif
323 
324 # If we have "make <whatever> modules", compile modules
325 # in addition to whatever we do anyway.
326 # Just "make" or "make all" shall build modules as well
327 
328 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
329   KBUILD_MODULES := 1
330 endif
331 
332 ifeq ($(MAKECMDGOALS),)
333   KBUILD_MODULES := 1
334 endif
335 
336 export KBUILD_MODULES KBUILD_BUILTIN
337 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
338 
339 ifneq ($(CC),)
340 ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1)
341 COMPILER := clang
342 else
343 COMPILER := gcc
344 endif
345 export COMPILER
346 endif
347 
348 # We need some generic definitions (do not try to remake the file).
349 scripts/Kbuild.include: ;
350 include scripts/Kbuild.include
351 
352 # Make variables (CC, etc...)
353 AS              = $(CROSS_COMPILE)as
354 LD              = $(CROSS_COMPILE)ld
355 CC              = $(CROSS_COMPILE)gcc
356 CPP             = $(CC) -E
357 AR              = $(CROSS_COMPILE)ar
358 NM              = $(CROSS_COMPILE)nm
359 STRIP           = $(CROSS_COMPILE)strip
360 OBJCOPY         = $(CROSS_COMPILE)objcopy
361 OBJDUMP         = $(CROSS_COMPILE)objdump
362 AWK             = awk
363 GENKSYMS        = scripts/genksyms/genksyms
364 INSTALLKERNEL  := installkernel
365 DEPMOD          = /sbin/depmod
366 PERL            = perl
367 PYTHON          = python
368 CHECK           = sparse
369 
370 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
371                   -Wbitwise -Wno-return-void $(CF)
372 CFLAGS_MODULE   =
373 AFLAGS_MODULE   =
374 LDFLAGS_MODULE  =
375 CFLAGS_KERNEL   =
376 AFLAGS_KERNEL   =
377 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
378 
379 
380 # Use USERINCLUDE when you must reference the UAPI directories only.
381 USERINCLUDE    := \
382                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
383                 -Iarch/$(hdr-arch)/include/generated/uapi \
384                 -I$(srctree)/include/uapi \
385                 -Iinclude/generated/uapi \
386                 -include $(srctree)/include/linux/kconfig.h
387 
388 # Use LINUXINCLUDE when you must reference the include/ directory.
389 # Needed to be compatible with the O= option
390 LINUXINCLUDE    := \
391                 -I$(srctree)/arch/$(hdr-arch)/include \
392                 -Iarch/$(hdr-arch)/include/generated/uapi \
393                 -Iarch/$(hdr-arch)/include/generated \
394                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
395                 -Iinclude \
396                 $(USERINCLUDE)
397 
398 KBUILD_CPPFLAGS := -D__KERNEL__
399 
400 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
401                    -fno-strict-aliasing -fno-common \
402                    -Werror-implicit-function-declaration \
403                    -Wno-format-security \
404                    -std=gnu89
405 
406 KBUILD_AFLAGS_KERNEL :=
407 KBUILD_CFLAGS_KERNEL :=
408 KBUILD_AFLAGS   := -D__ASSEMBLY__
409 KBUILD_AFLAGS_MODULE  := -DMODULE
410 KBUILD_CFLAGS_MODULE  := -DMODULE
411 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
412 
413 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
414 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
415 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
416 
417 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
418 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
419 export CPP AR NM STRIP OBJCOPY OBJDUMP
420 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
421 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
422 
423 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
424 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KASAN
425 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
426 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
427 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
428 export KBUILD_ARFLAGS
429 
430 # When compiling out-of-tree modules, put MODVERDIR in the module
431 # tree rather than in the kernel tree. The kernel tree might
432 # even be read-only.
433 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
434 
435 # Files to ignore in find ... statements
436 
437 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
438                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
439                           -prune -o
440 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
441                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
442 
443 # ===========================================================================
444 # Rules shared between *config targets and build targets
445 
446 # Basic helpers built in scripts/
447 PHONY += scripts_basic
448 scripts_basic:
449         $(Q)$(MAKE) $(build)=scripts/basic
450         $(Q)rm -f .tmp_quiet_recordmcount
451 
452 # To avoid any implicit rule to kick in, define an empty command.
453 scripts/basic/%: scripts_basic ;
454 
455 PHONY += outputmakefile
456 # outputmakefile generates a Makefile in the output directory, if using a
457 # separate output directory. This allows convenient use of make in the
458 # output directory.
459 outputmakefile:
460 ifneq ($(KBUILD_SRC),)
461         $(Q)ln -fsn $(srctree) source
462         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
463             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
464 endif
465 
466 # Support for using generic headers in asm-generic
467 PHONY += asm-generic
468 asm-generic:
469         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
470                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
471         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
472                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
473 
474 # To make sure we do not include .config for any of the *config targets
475 # catch them early, and hand them over to scripts/kconfig/Makefile
476 # It is allowed to specify more targets when calling make, including
477 # mixing *config targets and build targets.
478 # For example 'make oldconfig all'.
479 # Detect when mixed targets is specified, and make a second invocation
480 # of make so .config is not included in this case either (for *config).
481 
482 version_h := include/generated/uapi/linux/version.h
483 old_version_h := include/linux/version.h
484 
485 no-dot-config-targets := clean mrproper distclean \
486                          cscope gtags TAGS tags help% %docs check% coccicheck \
487                          $(version_h) headers_% archheaders archscripts \
488                          kernelversion %src-pkg
489 
490 config-targets := 0
491 mixed-targets  := 0
492 dot-config     := 1
493 
494 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
495         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
496                 dot-config := 0
497         endif
498 endif
499 
500 ifeq ($(KBUILD_EXTMOD),)
501         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
502                 config-targets := 1
503                 ifneq ($(words $(MAKECMDGOALS)),1)
504                         mixed-targets := 1
505                 endif
506         endif
507 endif
508 
509 ifeq ($(mixed-targets),1)
510 # ===========================================================================
511 # We're called with mixed targets (*config and build targets).
512 # Handle them one by one.
513 
514 PHONY += $(MAKECMDGOALS) __build_one_by_one
515 
516 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
517         @:
518 
519 __build_one_by_one:
520         $(Q)set -e; \
521         for i in $(MAKECMDGOALS); do \
522                 $(MAKE) -f $(srctree)/Makefile $$i; \
523         done
524 
525 else
526 ifeq ($(config-targets),1)
527 # ===========================================================================
528 # *config targets only - make sure prerequisites are updated, and descend
529 # in scripts/kconfig to make the *config target
530 
531 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
532 # KBUILD_DEFCONFIG may point out an alternative default configuration
533 # used for 'make defconfig'
534 include arch/$(SRCARCH)/Makefile
535 export KBUILD_DEFCONFIG KBUILD_KCONFIG
536 
537 config: scripts_basic outputmakefile FORCE
538         $(Q)$(MAKE) $(build)=scripts/kconfig $@
539 
540 %config: scripts_basic outputmakefile FORCE
541         $(Q)$(MAKE) $(build)=scripts/kconfig $@
542 
543 else
544 # ===========================================================================
545 # Build targets only - this includes vmlinux, arch specific targets, clean
546 # targets and others. In general all targets except *config targets.
547 
548 ifeq ($(KBUILD_EXTMOD),)
549 # Additional helpers built in scripts/
550 # Carefully list dependencies so we do not try to build scripts twice
551 # in parallel
552 PHONY += scripts
553 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
554          asm-generic
555         $(Q)$(MAKE) $(build)=$(@)
556 
557 # Objects we will link into vmlinux / subdirs we need to visit
558 init-y          := init/
559 drivers-y       := drivers/ sound/ firmware/
560 net-y           := net/
561 libs-y          := lib/
562 core-y          := usr/
563 endif # KBUILD_EXTMOD
564 
565 ifeq ($(dot-config),1)
566 # Read in config
567 -include include/config/auto.conf
568 
569 ifeq ($(KBUILD_EXTMOD),)
570 # Read in dependencies to all Kconfig* files, make sure to run
571 # oldconfig if changes are detected.
572 -include include/config/auto.conf.cmd
573 
574 # To avoid any implicit rule to kick in, define an empty command
575 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
576 
577 # If .config is newer than include/config/auto.conf, someone tinkered
578 # with it and forgot to run make oldconfig.
579 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
580 # we execute the config step to be sure to catch updated Kconfig files
581 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
582         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
583 else
584 # external modules needs include/generated/autoconf.h and include/config/auto.conf
585 # but do not care if they are up-to-date. Use auto.conf to trigger the test
586 PHONY += include/config/auto.conf
587 
588 include/config/auto.conf:
589         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
590         echo >&2;                                                       \
591         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
592         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
593         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
594         echo >&2 ;                                                      \
595         /bin/false)
596 
597 endif # KBUILD_EXTMOD
598 
599 else
600 # Dummy target needed, because used as prerequisite
601 include/config/auto.conf: ;
602 endif # $(dot-config)
603 
604 # The all: target is the default when no target is given on the
605 # command line.
606 # This allow a user to issue only 'make' to build a kernel including modules
607 # Defaults to vmlinux, but the arch makefile usually adds further targets
608 all: vmlinux
609 
610 include arch/$(SRCARCH)/Makefile
611 
612 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
613 
614 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
615 KBUILD_CFLAGS   += -Os $(call cc-disable-warning,maybe-uninitialized,)
616 else
617 KBUILD_CFLAGS   += -O2
618 endif
619 
620 # Tell gcc to never replace conditional load with a non-conditional one
621 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
622 
623 ifdef CONFIG_READABLE_ASM
624 # Disable optimizations that make assembler listings hard to read.
625 # reorder blocks reorders the control in the function
626 # ipa clone creates specialized cloned functions
627 # partial inlining inlines only parts of functions
628 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
629                  $(call cc-option,-fno-ipa-cp-clone,) \
630                  $(call cc-option,-fno-partial-inlining)
631 endif
632 
633 ifneq ($(CONFIG_FRAME_WARN),0)
634 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
635 endif
636 
637 # Handle stack protector mode.
638 #
639 # Since kbuild can potentially perform two passes (first with the old
640 # .config values and then with updated .config values), we cannot error out
641 # if a desired compiler option is unsupported. If we were to error, kbuild
642 # could never get to the second pass and actually notice that we changed
643 # the option to something that was supported.
644 #
645 # Additionally, we don't want to fallback and/or silently change which compiler
646 # flags will be used, since that leads to producing kernels with different
647 # security feature characteristics depending on the compiler used. ("But I
648 # selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
649 #
650 # The middle ground is to warn here so that the failed option is obvious, but
651 # to let the build fail with bad compiler flags so that we can't produce a
652 # kernel when there is a CONFIG and compiler mismatch.
653 #
654 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
655   stackp-flag := -fstack-protector
656   ifeq ($(call cc-option, $(stackp-flag)),)
657     $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
658              -fstack-protector not supported by compiler)
659   endif
660 else
661 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
662   stackp-flag := -fstack-protector-strong
663   ifeq ($(call cc-option, $(stackp-flag)),)
664     $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
665               -fstack-protector-strong not supported by compiler)
666   endif
667 else
668   # Force off for distro compilers that enable stack protector by default.
669   stackp-flag := $(call cc-option, -fno-stack-protector)
670 endif
671 endif
672 KBUILD_CFLAGS += $(stackp-flag)
673 
674 ifeq ($(COMPILER),clang)
675 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
676 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
677 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
678 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
679 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
680 # Quiet clang warning: comparison of unsigned expression < 0 is always false
681 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
682 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
683 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
684 # See modpost pattern 2
685 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
686 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
687 else
688 
689 # This warning generated too much noise in a regular build.
690 # Use make W=1 to enable this warning (see scripts/Makefile.build)
691 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
692 endif
693 
694 ifdef CONFIG_FRAME_POINTER
695 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
696 else
697 # Some targets (ARM with Thumb2, for example), can't be built with frame
698 # pointers.  For those, we don't have FUNCTION_TRACER automatically
699 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
700 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
701 # -fomit-frame-pointer with FUNCTION_TRACER.
702 ifndef CONFIG_FUNCTION_TRACER
703 KBUILD_CFLAGS   += -fomit-frame-pointer
704 endif
705 endif
706 
707 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
708 
709 ifdef CONFIG_DEBUG_INFO
710 ifdef CONFIG_DEBUG_INFO_SPLIT
711 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
712 else
713 KBUILD_CFLAGS   += -g
714 endif
715 KBUILD_AFLAGS   += -Wa,-gdwarf-2
716 endif
717 ifdef CONFIG_DEBUG_INFO_DWARF4
718 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
719 endif
720 
721 ifdef CONFIG_DEBUG_INFO_REDUCED
722 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
723                    $(call cc-option,-fno-var-tracking)
724 endif
725 
726 ifdef CONFIG_FUNCTION_TRACER
727 ifndef CC_FLAGS_FTRACE
728 CC_FLAGS_FTRACE := -pg
729 endif
730 export CC_FLAGS_FTRACE
731 ifdef CONFIG_HAVE_FENTRY
732 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
733 endif
734 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
735 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
736 ifdef CONFIG_DYNAMIC_FTRACE
737         ifdef CONFIG_HAVE_C_RECORDMCOUNT
738                 BUILD_C_RECORDMCOUNT := y
739                 export BUILD_C_RECORDMCOUNT
740         endif
741 endif
742 endif
743 
744 # We trigger additional mismatches with less inlining
745 ifdef CONFIG_DEBUG_SECTION_MISMATCH
746 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
747 endif
748 
749 # arch Makefile may override CC so keep this after arch Makefile is included
750 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
751 CHECKFLAGS     += $(NOSTDINC_FLAGS)
752 
753 # warn about C99 declaration after statement
754 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
755 
756 # disable pointer signed / unsigned warnings in gcc 4.0
757 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
758 
759 # disable invalid "can't wrap" optimizations for signed / pointers
760 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
761 
762 # conserve stack if available
763 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
764 
765 # disallow errors like 'EXPORT_GPL(foo);' with missing header
766 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
767 
768 # require functions to have arguments in prototypes, not empty 'int foo()'
769 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
770 
771 # Prohibit date/time macros, which would make the build non-deterministic
772 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
773 
774 # use the deterministic mode of AR if available
775 KBUILD_ARFLAGS := $(call ar-option,D)
776 
777 # check for 'asm goto'
778 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
779         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
780         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
781 endif
782 
783 include scripts/Makefile.kasan
784 include scripts/Makefile.extrawarn
785 
786 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
787 KBUILD_CPPFLAGS += $(KCPPFLAGS)
788 KBUILD_AFLAGS += $(KAFLAGS)
789 KBUILD_CFLAGS += $(KCFLAGS)
790 
791 # Use --build-id when available.
792 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
793                               $(call cc-ldoption, -Wl$(comma)--build-id,))
794 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
795 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
796 
797 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
798 LDFLAGS_vmlinux += $(call ld-option, -X,)
799 endif
800 
801 # Default kernel image to build when no specific target is given.
802 # KBUILD_IMAGE may be overruled on the command line or
803 # set in the environment
804 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
805 # this default value
806 export KBUILD_IMAGE ?= vmlinux
807 
808 #
809 # INSTALL_PATH specifies where to place the updated kernel and system map
810 # images. Default is /boot, but you can set it to other values
811 export  INSTALL_PATH ?= /boot
812 
813 #
814 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
815 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
816 # an argument if needed. Otherwise it defaults to the kernel install path
817 #
818 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
819 
820 #
821 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
822 # relocations required by build roots.  This is not defined in the
823 # makefile but the argument can be passed to make if needed.
824 #
825 
826 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
827 export MODLIB
828 
829 #
830 # INSTALL_MOD_STRIP, if defined, will cause modules to be
831 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
832 # the default option --strip-debug will be used.  Otherwise,
833 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
834 
835 ifdef INSTALL_MOD_STRIP
836 ifeq ($(INSTALL_MOD_STRIP),1)
837 mod_strip_cmd = $(STRIP) --strip-debug
838 else
839 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
840 endif # INSTALL_MOD_STRIP=1
841 else
842 mod_strip_cmd = true
843 endif # INSTALL_MOD_STRIP
844 export mod_strip_cmd
845 
846 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
847 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
848 # or CONFIG_MODULE_COMPRESS_XZ.
849 
850 mod_compress_cmd = true
851 ifdef CONFIG_MODULE_COMPRESS
852   ifdef CONFIG_MODULE_COMPRESS_GZIP
853     mod_compress_cmd = gzip -n
854   endif # CONFIG_MODULE_COMPRESS_GZIP
855   ifdef CONFIG_MODULE_COMPRESS_XZ
856     mod_compress_cmd = xz
857   endif # CONFIG_MODULE_COMPRESS_XZ
858 endif # CONFIG_MODULE_COMPRESS
859 export mod_compress_cmd
860 
861 # Select initial ramdisk compression format, default is gzip(1).
862 # This shall be used by the dracut(8) tool while creating an initramfs image.
863 #
864 INITRD_COMPRESS-y                  := gzip
865 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
866 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
867 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
868 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
869 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
870 # do not export INITRD_COMPRESS, since we didn't actually
871 # choose a sane default compression above.
872 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
873 
874 ifdef CONFIG_MODULE_SIG_ALL
875 MODSECKEY = ./signing_key.priv
876 MODPUBKEY = ./signing_key.x509
877 export MODPUBKEY
878 mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
879 else
880 mod_sign_cmd = true
881 endif
882 export mod_sign_cmd
883 
884 
885 ifeq ($(KBUILD_EXTMOD),)
886 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
887 
888 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
889                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
890                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
891 
892 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
893                      $(init-) $(core-) $(drivers-) $(net-) $(libs-))))
894 
895 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
896 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
897 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
898 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
899 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
900 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
901 libs-y          := $(libs-y1) $(libs-y2)
902 
903 # Externally visible symbols (used by link-vmlinux.sh)
904 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
905 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
906 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
907 export LDFLAGS_vmlinux
908 # used by scripts/pacmage/Makefile
909 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
910 
911 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
912 
913 # Final link of vmlinux
914       cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
915 quiet_cmd_link-vmlinux = LINK    $@
916 
917 # Include targets which we want to
918 # execute if the rest of the kernel build went well.
919 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
920 ifdef CONFIG_HEADERS_CHECK
921         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
922 endif
923 ifdef CONFIG_SAMPLES
924         $(Q)$(MAKE) $(build)=samples
925 endif
926 ifdef CONFIG_BUILD_DOCSRC
927         $(Q)$(MAKE) $(build)=Documentation
928 endif
929 ifdef CONFIG_GDB_SCRIPTS
930         $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
931 endif
932         +$(call if_changed,link-vmlinux)
933 
934 # The actual objects are generated when descending,
935 # make sure no implicit rule kicks in
936 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
937 
938 # Handle descending into subdirectories listed in $(vmlinux-dirs)
939 # Preset locale variables to speed up the build process. Limit locale
940 # tweaks to this spot to avoid wrong language settings when running
941 # make menuconfig etc.
942 # Error messages still appears in the original language
943 
944 PHONY += $(vmlinux-dirs)
945 $(vmlinux-dirs): prepare scripts
946         $(Q)$(MAKE) $(build)=$@
947 
948 define filechk_kernel.release
949         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
950 endef
951 
952 # Store (new) KERNELRELEASE string in include/config/kernel.release
953 include/config/kernel.release: include/config/auto.conf FORCE
954         $(call filechk,kernel.release)
955 
956 
957 # Things we need to do before we recursively start building the kernel
958 # or the modules are listed in "prepare".
959 # A multi level approach is used. prepareN is processed before prepareN-1.
960 # archprepare is used in arch Makefiles and when processed asm symlink,
961 # version.h and scripts_basic is processed / created.
962 
963 # Listed in dependency order
964 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
965 
966 # prepare3 is used to check if we are building in a separate output directory,
967 # and if so do:
968 # 1) Check that make has not been executed in the kernel src $(srctree)
969 prepare3: include/config/kernel.release
970 ifneq ($(KBUILD_SRC),)
971         @$(kecho) '  Using $(srctree) as source for kernel'
972         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
973                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
974                 echo >&2 "  in the '$(srctree)' directory.";\
975                 /bin/false; \
976         fi;
977 endif
978 
979 # prepare2 creates a makefile if using a separate output directory
980 prepare2: prepare3 outputmakefile asm-generic
981 
982 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
983                    include/config/auto.conf
984         $(cmd_crmodverdir)
985 
986 archprepare: archheaders archscripts prepare1 scripts_basic
987 
988 prepare0: archprepare FORCE
989         $(Q)$(MAKE) $(build)=.
990 
991 # All the preparing..
992 prepare: prepare0
993 
994 # Generate some files
995 # ---------------------------------------------------------------------------
996 
997 # KERNELRELEASE can change from a few different places, meaning version.h
998 # needs to be updated, so this check is forced on all builds
999 
1000 uts_len := 64
1001 define filechk_utsrelease.h
1002         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1003           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1004           exit 1;                                                         \
1005         fi;                                                               \
1006         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1007 endef
1008 
1009 define filechk_version.h
1010         (echo \#define LINUX_VERSION_CODE $(shell                         \
1011         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1012         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1013 endef
1014 
1015 $(version_h): $(srctree)/Makefile FORCE
1016         $(call filechk,version.h)
1017         $(Q)rm -f $(old_version_h)
1018 
1019 include/generated/utsrelease.h: include/config/kernel.release FORCE
1020         $(call filechk,utsrelease.h)
1021 
1022 PHONY += headerdep
1023 headerdep:
1024         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1025         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1026 
1027 # ---------------------------------------------------------------------------
1028 # Firmware install
1029 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1030 export INSTALL_FW_PATH
1031 
1032 PHONY += firmware_install
1033 firmware_install: FORCE
1034         @mkdir -p $(objtree)/firmware
1035         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1036 
1037 # ---------------------------------------------------------------------------
1038 # Kernel headers
1039 
1040 #Default location for installed headers
1041 export INSTALL_HDR_PATH = $(objtree)/usr
1042 
1043 # If we do an all arch process set dst to asm-$(hdr-arch)
1044 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1045 
1046 PHONY += archheaders
1047 archheaders:
1048 
1049 PHONY += archscripts
1050 archscripts:
1051 
1052 PHONY += __headers
1053 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1054         $(Q)$(MAKE) $(build)=scripts build_unifdef
1055 
1056 PHONY += headers_install_all
1057 headers_install_all:
1058         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1059 
1060 PHONY += headers_install
1061 headers_install: __headers
1062         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1063           $(error Headers not exportable for the $(SRCARCH) architecture))
1064         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1065         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1066 
1067 PHONY += headers_check_all
1068 headers_check_all: headers_install_all
1069         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1070 
1071 PHONY += headers_check
1072 headers_check: headers_install
1073         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1074         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1075 
1076 # ---------------------------------------------------------------------------
1077 # Kernel selftest
1078 
1079 PHONY += kselftest
1080 kselftest:
1081         $(Q)$(MAKE) -C tools/testing/selftests run_tests
1082 
1083 # ---------------------------------------------------------------------------
1084 # Modules
1085 
1086 ifdef CONFIG_MODULES
1087 
1088 # By default, build modules as well
1089 
1090 all: modules
1091 
1092 # Build modules
1093 #
1094 # A module can be listed more than once in obj-m resulting in
1095 # duplicate lines in modules.order files.  Those are removed
1096 # using awk while concatenating to the final file.
1097 
1098 PHONY += modules
1099 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1100         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1101         @$(kecho) '  Building modules, stage 2.';
1102         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1103         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1104 
1105 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1106         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1107 
1108 %/modules.builtin: include/config/auto.conf
1109         $(Q)$(MAKE) $(modbuiltin)=$*
1110 
1111 
1112 # Target to prepare building external modules
1113 PHONY += modules_prepare
1114 modules_prepare: prepare scripts
1115 
1116 # Target to install modules
1117 PHONY += modules_install
1118 modules_install: _modinst_ _modinst_post
1119 
1120 PHONY += _modinst_
1121 _modinst_:
1122         @rm -rf $(MODLIB)/kernel
1123         @rm -f $(MODLIB)/source
1124         @mkdir -p $(MODLIB)/kernel
1125         @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1126         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1127                 rm -f $(MODLIB)/build ; \
1128                 ln -s $(CURDIR) $(MODLIB)/build ; \
1129         fi
1130         @cp -f $(objtree)/modules.order $(MODLIB)/
1131         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1132         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1133 
1134 # This depmod is only for convenience to give the initial
1135 # boot a modules.dep even before / is mounted read-write.  However the
1136 # boot script depmod is the master version.
1137 PHONY += _modinst_post
1138 _modinst_post: _modinst_
1139         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1140         $(call cmd,depmod)
1141 
1142 ifeq ($(CONFIG_MODULE_SIG), y)
1143 PHONY += modules_sign
1144 modules_sign:
1145         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1146 endif
1147 
1148 else # CONFIG_MODULES
1149 
1150 # Modules not configured
1151 # ---------------------------------------------------------------------------
1152 
1153 modules modules_install: FORCE
1154         @echo >&2
1155         @echo >&2 "The present kernel configuration has modules disabled."
1156         @echo >&2 "Type 'make config' and enable loadable module support."
1157         @echo >&2 "Then build a kernel with module support enabled."
1158         @echo >&2
1159         @exit 1
1160 
1161 endif # CONFIG_MODULES
1162 
1163 ###
1164 # Cleaning is done on three levels.
1165 # make clean     Delete most generated files
1166 #                Leave enough to build external modules
1167 # make mrproper  Delete the current configuration, and all generated files
1168 # make distclean Remove editor backup files, patch leftover files and the like
1169 
1170 # Directories & files removed with 'make clean'
1171 CLEAN_DIRS  += $(MODVERDIR)
1172 
1173 # Directories & files removed with 'make mrproper'
1174 MRPROPER_DIRS  += include/config usr/include include/generated          \
1175                   arch/*/include/generated .tmp_objdiff
1176 MRPROPER_FILES += .config .config.old .version .old_version \
1177                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1178                   signing_key.priv signing_key.x509 x509.genkey         \
1179                   extra_certificates signing_key.x509.keyid             \
1180                   signing_key.x509.signer vmlinux-gdb.py
1181 
1182 # clean - Delete most, but leave enough to build external modules
1183 #
1184 clean: rm-dirs  := $(CLEAN_DIRS)
1185 clean: rm-files := $(CLEAN_FILES)
1186 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1187 
1188 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1189 $(clean-dirs):
1190         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1191 
1192 vmlinuxclean:
1193         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1194 
1195 clean: archclean vmlinuxclean
1196 
1197 # mrproper - Delete all generated files, including .config
1198 #
1199 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1200 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1201 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1202 
1203 PHONY += $(mrproper-dirs) mrproper archmrproper
1204 $(mrproper-dirs):
1205         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1206 
1207 mrproper: clean archmrproper $(mrproper-dirs)
1208         $(call cmd,rmdirs)
1209         $(call cmd,rmfiles)
1210 
1211 # distclean
1212 #
1213 PHONY += distclean
1214 
1215 distclean: mrproper
1216         @find $(srctree) $(RCS_FIND_IGNORE) \
1217                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1218                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1219                 -o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
1220                 -type f -print | xargs rm -f
1221 
1222 
1223 # Packaging of the kernel to various formats
1224 # ---------------------------------------------------------------------------
1225 # rpm target kept for backward compatibility
1226 package-dir     := scripts/package
1227 
1228 %src-pkg: FORCE
1229         $(Q)$(MAKE) $(build)=$(package-dir) $@
1230 %pkg: include/config/kernel.release FORCE
1231         $(Q)$(MAKE) $(build)=$(package-dir) $@
1232 rpm: include/config/kernel.release FORCE
1233         $(Q)$(MAKE) $(build)=$(package-dir) $@
1234 
1235 
1236 # Brief documentation of the typical targets used
1237 # ---------------------------------------------------------------------------
1238 
1239 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1240 boards := $(sort $(notdir $(boards)))
1241 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1242 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1243 
1244 help:
1245         @echo  'Cleaning targets:'
1246         @echo  '  clean           - Remove most generated files but keep the config and'
1247         @echo  '                    enough build support to build external modules'
1248         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1249         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1250         @echo  ''
1251         @echo  'Configuration targets:'
1252         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1253         @echo  ''
1254         @echo  'Other generic targets:'
1255         @echo  '  all             - Build all targets marked with [*]'
1256         @echo  '* vmlinux         - Build the bare kernel'
1257         @echo  '* modules         - Build all modules'
1258         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1259         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1260         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1261         @echo  '  dir/            - Build all files in dir and below'
1262         @echo  '  dir/file.[oisS] - Build specified target only'
1263         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1264         @echo  '                    (requires a recent binutils and recent build (System.map))'
1265         @echo  '  dir/file.ko     - Build module including final link'
1266         @echo  '  modules_prepare - Set up for building external modules'
1267         @echo  '  tags/TAGS       - Generate tags file for editors'
1268         @echo  '  cscope          - Generate cscope index'
1269         @echo  '  gtags           - Generate GNU GLOBAL index'
1270         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1271         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1272         @echo  '  image_name      - Output the image name (use with make -s)'
1273         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1274          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1275          echo  ''
1276         @echo  'Static analysers'
1277         @echo  '  checkstack      - Generate a list of stack hogs'
1278         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1279         @echo  '  versioncheck    - Sanity check on version.h usage'
1280         @echo  '  includecheck    - Check for duplicate included header files'
1281         @echo  '  export_report   - List the usages of all exported symbols'
1282         @echo  '  headers_check   - Sanity check on exported headers'
1283         @echo  '  headerdep       - Detect inclusion cycles in headers'
1284         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1285         @echo  ''
1286         @echo  'Kernel selftest'
1287         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1288         @echo  '                    Build, install, and boot kernel before'
1289         @echo  '                    running kselftest on it'
1290         @echo  ''
1291         @echo  'Kernel packaging:'
1292         @$(MAKE) $(build)=$(package-dir) help
1293         @echo  ''
1294         @echo  'Documentation targets:'
1295         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1296         @echo  ''
1297         @echo  'Architecture specific targets ($(SRCARCH)):'
1298         @$(if $(archhelp),$(archhelp),\
1299                 echo '  No architecture specific help defined for $(SRCARCH)')
1300         @echo  ''
1301         @$(if $(boards), \
1302                 $(foreach b, $(boards), \
1303                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1304                 echo '')
1305         @$(if $(board-dirs), \
1306                 $(foreach b, $(board-dirs), \
1307                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1308                 printf "  %-16s - Show all of the above\\n" help-boards; \
1309                 echo '')
1310 
1311         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1312         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1313         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1314         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1315         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1316         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1317         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1318         @echo  '                1: warnings which may be relevant and do not occur too often'
1319         @echo  '                2: warnings which occur quite often but may still be relevant'
1320         @echo  '                3: more obscure warnings, can most likely be ignored'
1321         @echo  '                Multiple levels can be combined with W=12 or W=123'
1322         @echo  ''
1323         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1324         @echo  'For further info see the ./README file'
1325 
1326 
1327 help-board-dirs := $(addprefix help-,$(board-dirs))
1328 
1329 help-boards: $(help-board-dirs)
1330 
1331 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1332 
1333 $(help-board-dirs): help-%:
1334         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1335         @$(if $(boards-per-dir), \
1336                 $(foreach b, $(boards-per-dir), \
1337                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1338                 echo '')
1339 
1340 
1341 # Documentation targets
1342 # ---------------------------------------------------------------------------
1343 %docs: scripts_basic FORCE
1344         $(Q)$(MAKE) $(build)=scripts build_docproc
1345         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1346 
1347 else # KBUILD_EXTMOD
1348 
1349 ###
1350 # External module support.
1351 # When building external modules the kernel used as basis is considered
1352 # read-only, and no consistency checks are made and the make
1353 # system is not used on the basis kernel. If updates are required
1354 # in the basis kernel ordinary make commands (without M=...) must
1355 # be used.
1356 #
1357 # The following are the only valid targets when building external
1358 # modules.
1359 # make M=dir clean     Delete all automatically generated files
1360 # make M=dir modules   Make all modules in specified dir
1361 # make M=dir           Same as 'make M=dir modules'
1362 # make M=dir modules_install
1363 #                      Install the modules built in the module directory
1364 #                      Assumes install directory is already created
1365 
1366 # We are always building modules
1367 KBUILD_MODULES := 1
1368 PHONY += crmodverdir
1369 crmodverdir:
1370         $(cmd_crmodverdir)
1371 
1372 PHONY += $(objtree)/Module.symvers
1373 $(objtree)/Module.symvers:
1374         @test -e $(objtree)/Module.symvers || ( \
1375         echo; \
1376         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1377         echo "           is missing; modules will have no dependencies and modversions."; \
1378         echo )
1379 
1380 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1381 PHONY += $(module-dirs) modules
1382 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1383         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1384 
1385 modules: $(module-dirs)
1386         @$(kecho) '  Building modules, stage 2.';
1387         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1388 
1389 PHONY += modules_install
1390 modules_install: _emodinst_ _emodinst_post
1391 
1392 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1393 PHONY += _emodinst_
1394 _emodinst_:
1395         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1396         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1397 
1398 PHONY += _emodinst_post
1399 _emodinst_post: _emodinst_
1400         $(call cmd,depmod)
1401 
1402 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1403 
1404 PHONY += $(clean-dirs) clean
1405 $(clean-dirs):
1406         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1407 
1408 clean:  rm-dirs := $(MODVERDIR)
1409 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1410 
1411 help:
1412         @echo  '  Building external modules.'
1413         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1414         @echo  ''
1415         @echo  '  modules         - default target, build the module(s)'
1416         @echo  '  modules_install - install the module'
1417         @echo  '  clean           - remove generated files in module directory only'
1418         @echo  ''
1419 
1420 # Dummies...
1421 PHONY += prepare scripts
1422 prepare: ;
1423 scripts: ;
1424 endif # KBUILD_EXTMOD
1425 
1426 clean: $(clean-dirs)
1427         $(call cmd,rmdirs)
1428         $(call cmd,rmfiles)
1429         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1430                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1431                 -o -name '*.ko.*' \
1432                 -o -name '*.dwo'  \
1433                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1434                 -o -name '*.symtypes' -o -name 'modules.order' \
1435                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1436                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1437 
1438 # Generate tags for editors
1439 # ---------------------------------------------------------------------------
1440 quiet_cmd_tags = GEN     $@
1441       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1442 
1443 tags TAGS cscope gtags: FORCE
1444         $(call cmd,tags)
1445 
1446 # Scripts to check various things for consistency
1447 # ---------------------------------------------------------------------------
1448 
1449 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1450 
1451 includecheck:
1452         find $(srctree)/* $(RCS_FIND_IGNORE) \
1453                 -name '*.[hcS]' -type f -print | sort \
1454                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1455 
1456 versioncheck:
1457         find $(srctree)/* $(RCS_FIND_IGNORE) \
1458                 -name '*.[hcS]' -type f -print | sort \
1459                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1460 
1461 coccicheck:
1462         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1463 
1464 namespacecheck:
1465         $(PERL) $(srctree)/scripts/namespace.pl
1466 
1467 export_report:
1468         $(PERL) $(srctree)/scripts/export_report.pl
1469 
1470 endif #ifeq ($(config-targets),1)
1471 endif #ifeq ($(mixed-targets),1)
1472 
1473 PHONY += checkstack kernelrelease kernelversion image_name
1474 
1475 # UML needs a little special treatment here.  It wants to use the host
1476 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1477 # else wants $(ARCH), including people doing cross-builds, which means
1478 # that $(SUBARCH) doesn't work here.
1479 ifeq ($(ARCH), um)
1480 CHECKSTACK_ARCH := $(SUBARCH)
1481 else
1482 CHECKSTACK_ARCH := $(ARCH)
1483 endif
1484 checkstack:
1485         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1486         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1487 
1488 kernelrelease:
1489         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1490 
1491 kernelversion:
1492         @echo $(KERNELVERSION)
1493 
1494 image_name:
1495         @echo $(KBUILD_IMAGE)
1496 
1497 # Clear a bunch of variables before executing the submake
1498 tools/: FORCE
1499         $(Q)mkdir -p $(objtree)/tools
1500         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1501 
1502 tools/%: FORCE
1503         $(Q)mkdir -p $(objtree)/tools
1504         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1505 
1506 # Single targets
1507 # ---------------------------------------------------------------------------
1508 # Single targets are compatible with:
1509 # - build with mixed source and output
1510 # - build with separate output dir 'make O=...'
1511 # - external modules
1512 #
1513 #  target-dir => where to store outputfile
1514 #  build-dir  => directory in kernel source tree to use
1515 
1516 ifeq ($(KBUILD_EXTMOD),)
1517         build-dir  = $(patsubst %/,%,$(dir $@))
1518         target-dir = $(dir $@)
1519 else
1520         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1521         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1522         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1523 endif
1524 
1525 %.s: %.c prepare scripts FORCE
1526         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1527 %.i: %.c prepare scripts FORCE
1528         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1529 %.o: %.c prepare scripts FORCE
1530         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1531 %.lst: %.c prepare scripts FORCE
1532         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1533 %.s: %.S prepare scripts FORCE
1534         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1535 %.o: %.S prepare scripts FORCE
1536         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1537 %.symtypes: %.c prepare scripts FORCE
1538         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1539 
1540 # Modules
1541 /: prepare scripts FORCE
1542         $(cmd_crmodverdir)
1543         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1544         $(build)=$(build-dir)
1545 # Make sure the latest headers are built for Documentation
1546 Documentation/: headers_install
1547 %/: prepare scripts FORCE
1548         $(cmd_crmodverdir)
1549         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1550         $(build)=$(build-dir)
1551 %.ko: prepare scripts FORCE
1552         $(cmd_crmodverdir)
1553         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1554         $(build)=$(build-dir) $(@:.ko=.o)
1555         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1556 
1557 # FIXME Should go into a make.lib or something
1558 # ===========================================================================
1559 
1560 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1561       cmd_rmdirs = rm -rf $(rm-dirs)
1562 
1563 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1564       cmd_rmfiles = rm -f $(rm-files)
1565 
1566 # Run depmod only if we have System.map and depmod is executable
1567 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1568       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1569                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1570 
1571 # Create temporary dir for module support files
1572 # clean it up only when building all modules
1573 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1574                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1575 
1576 # read all saved command lines
1577 
1578 targets := $(wildcard $(sort $(targets)))
1579 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1580 
1581 ifneq ($(cmd_files),)
1582   $(cmd_files): ;       # Do not try to update included dependency files
1583   include $(cmd_files)
1584 endif
1585 
1586 endif   # skip-makefile
1587 
1588 PHONY += FORCE
1589 FORCE:
1590 
1591 # Declare the contents of the .PHONY variable as phony.  We keep that
1592 # information in a variable so we can use it in if_changed and friends.
1593 .PHONY: $(PHONY)

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