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 = 3
  2 PATCHLEVEL = 18
  3 SUBLEVEL = 0
  4 EXTRAVERSION =
  5 NAME = Diseased Newt
  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 \
395                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
396                 -Iinclude \
397                 $(USERINCLUDE)
398 
399 KBUILD_CPPFLAGS := -D__KERNEL__
400 
401 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
402                    -fno-strict-aliasing -fno-common \
403                    -Werror-implicit-function-declaration \
404                    -Wno-format-security \
405                    -std=gnu89
406 
407 KBUILD_AFLAGS_KERNEL :=
408 KBUILD_CFLAGS_KERNEL :=
409 KBUILD_AFLAGS   := -D__ASSEMBLY__
410 KBUILD_AFLAGS_MODULE  := -DMODULE
411 KBUILD_CFLAGS_MODULE  := -DMODULE
412 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
413 
414 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
415 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
416 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
417 
418 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
419 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
420 export CPP AR NM STRIP OBJCOPY OBJDUMP
421 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
422 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
423 
424 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
425 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
426 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
427 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
428 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
429 export KBUILD_ARFLAGS
430 
431 # When compiling out-of-tree modules, put MODVERDIR in the module
432 # tree rather than in the kernel tree. The kernel tree might
433 # even be read-only.
434 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
435 
436 # Files to ignore in find ... statements
437 
438 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
439                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
440                           -prune -o
441 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
442                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
443 
444 # ===========================================================================
445 # Rules shared between *config targets and build targets
446 
447 # Basic helpers built in scripts/
448 PHONY += scripts_basic
449 scripts_basic:
450         $(Q)$(MAKE) $(build)=scripts/basic
451         $(Q)rm -f .tmp_quiet_recordmcount
452 
453 # To avoid any implicit rule to kick in, define an empty command.
454 scripts/basic/%: scripts_basic ;
455 
456 PHONY += outputmakefile
457 # outputmakefile generates a Makefile in the output directory, if using a
458 # separate output directory. This allows convenient use of make in the
459 # output directory.
460 outputmakefile:
461 ifneq ($(KBUILD_SRC),)
462         $(Q)ln -fsn $(srctree) source
463         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
464             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
465 endif
466 
467 # Support for using generic headers in asm-generic
468 PHONY += asm-generic
469 asm-generic:
470         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
471                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
472         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
473                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
474 
475 # To make sure we do not include .config for any of the *config targets
476 # catch them early, and hand them over to scripts/kconfig/Makefile
477 # It is allowed to specify more targets when calling make, including
478 # mixing *config targets and build targets.
479 # For example 'make oldconfig all'.
480 # Detect when mixed targets is specified, and make a second invocation
481 # of make so .config is not included in this case either (for *config).
482 
483 version_h := include/generated/uapi/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 ($(filter-out config %config,$(MAKECMDGOALS)),)
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 $(srctree)/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 $(srctree)/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 ifdef CONFIG_HAVE_FENTRY
728 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
729 endif
730 KBUILD_CFLAGS   += -pg $(CC_USING_FENTRY)
731 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
732 ifdef CONFIG_DYNAMIC_FTRACE
733         ifdef CONFIG_HAVE_C_RECORDMCOUNT
734                 BUILD_C_RECORDMCOUNT := y
735                 export BUILD_C_RECORDMCOUNT
736         endif
737 endif
738 endif
739 
740 # We trigger additional mismatches with less inlining
741 ifdef CONFIG_DEBUG_SECTION_MISMATCH
742 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
743 endif
744 
745 # arch Makefile may override CC so keep this after arch Makefile is included
746 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
747 CHECKFLAGS     += $(NOSTDINC_FLAGS)
748 
749 # warn about C99 declaration after statement
750 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
751 
752 # disable pointer signed / unsigned warnings in gcc 4.0
753 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
754 
755 # disable invalid "can't wrap" optimizations for signed / pointers
756 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
757 
758 # conserve stack if available
759 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
760 
761 # disallow errors like 'EXPORT_GPL(foo);' with missing header
762 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
763 
764 # require functions to have arguments in prototypes, not empty 'int foo()'
765 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
766 
767 # Prohibit date/time macros, which would make the build non-deterministic
768 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
769 
770 # use the deterministic mode of AR if available
771 KBUILD_ARFLAGS := $(call ar-option,D)
772 
773 # check for 'asm goto'
774 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
775         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
776 endif
777 
778 include $(srctree)/scripts/Makefile.extrawarn
779 
780 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
781 KBUILD_CPPFLAGS += $(KCPPFLAGS)
782 KBUILD_AFLAGS += $(KAFLAGS)
783 KBUILD_CFLAGS += $(KCFLAGS)
784 
785 # Use --build-id when available.
786 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
787                               $(call cc-ldoption, -Wl$(comma)--build-id,))
788 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
789 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
790 
791 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
792 LDFLAGS_vmlinux += $(call ld-option, -X,)
793 endif
794 
795 # Default kernel image to build when no specific target is given.
796 # KBUILD_IMAGE may be overruled on the command line or
797 # set in the environment
798 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
799 # this default value
800 export KBUILD_IMAGE ?= vmlinux
801 
802 #
803 # INSTALL_PATH specifies where to place the updated kernel and system map
804 # images. Default is /boot, but you can set it to other values
805 export  INSTALL_PATH ?= /boot
806 
807 #
808 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
809 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
810 # an argument if needed. Otherwise it defaults to the kernel install path
811 #
812 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
813 
814 #
815 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
816 # relocations required by build roots.  This is not defined in the
817 # makefile but the argument can be passed to make if needed.
818 #
819 
820 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
821 export MODLIB
822 
823 #
824 # INSTALL_MOD_STRIP, if defined, will cause modules to be
825 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
826 # the default option --strip-debug will be used.  Otherwise,
827 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
828 
829 ifdef INSTALL_MOD_STRIP
830 ifeq ($(INSTALL_MOD_STRIP),1)
831 mod_strip_cmd = $(STRIP) --strip-debug
832 else
833 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
834 endif # INSTALL_MOD_STRIP=1
835 else
836 mod_strip_cmd = true
837 endif # INSTALL_MOD_STRIP
838 export mod_strip_cmd
839 
840 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
841 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
842 # or CONFIG_MODULE_COMPRESS_XZ.
843 
844 mod_compress_cmd = true
845 ifdef CONFIG_MODULE_COMPRESS
846   ifdef CONFIG_MODULE_COMPRESS_GZIP
847     mod_compress_cmd = gzip -n
848   endif # CONFIG_MODULE_COMPRESS_GZIP
849   ifdef CONFIG_MODULE_COMPRESS_XZ
850     mod_compress_cmd = xz
851   endif # CONFIG_MODULE_COMPRESS_XZ
852 endif # CONFIG_MODULE_COMPRESS
853 export mod_compress_cmd
854 
855 # Select initial ramdisk compression format, default is gzip(1).
856 # This shall be used by the dracut(8) tool while creating an initramfs image.
857 #
858 INITRD_COMPRESS-y                  := gzip
859 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
860 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
861 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
862 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
863 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
864 # do not export INITRD_COMPRESS, since we didn't actually
865 # choose a sane default compression above.
866 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
867 
868 ifdef CONFIG_MODULE_SIG_ALL
869 MODSECKEY = ./signing_key.priv
870 MODPUBKEY = ./signing_key.x509
871 export MODPUBKEY
872 mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
873 else
874 mod_sign_cmd = true
875 endif
876 export mod_sign_cmd
877 
878 
879 ifeq ($(KBUILD_EXTMOD),)
880 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
881 
882 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
883                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
884                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
885 
886 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
887                      $(init-) $(core-) $(drivers-) $(net-) $(libs-))))
888 
889 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
890 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
891 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
892 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
893 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
894 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
895 libs-y          := $(libs-y1) $(libs-y2)
896 
897 # Externally visible symbols (used by link-vmlinux.sh)
898 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
899 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
900 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
901 export LDFLAGS_vmlinux
902 # used by scripts/pacmage/Makefile
903 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
904 
905 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
906 
907 # Final link of vmlinux
908       cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
909 quiet_cmd_link-vmlinux = LINK    $@
910 
911 # Include targets which we want to
912 # execute if the rest of the kernel build went well.
913 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
914 ifdef CONFIG_HEADERS_CHECK
915         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
916 endif
917 ifdef CONFIG_SAMPLES
918         $(Q)$(MAKE) $(build)=samples
919 endif
920 ifdef CONFIG_BUILD_DOCSRC
921         $(Q)$(MAKE) $(build)=Documentation
922 endif
923         +$(call if_changed,link-vmlinux)
924 
925 # The actual objects are generated when descending,
926 # make sure no implicit rule kicks in
927 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
928 
929 # Handle descending into subdirectories listed in $(vmlinux-dirs)
930 # Preset locale variables to speed up the build process. Limit locale
931 # tweaks to this spot to avoid wrong language settings when running
932 # make menuconfig etc.
933 # Error messages still appears in the original language
934 
935 PHONY += $(vmlinux-dirs)
936 $(vmlinux-dirs): prepare scripts
937         $(Q)$(MAKE) $(build)=$@
938 
939 define filechk_kernel.release
940         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
941 endef
942 
943 # Store (new) KERNELRELEASE string in include/config/kernel.release
944 include/config/kernel.release: include/config/auto.conf FORCE
945         $(call filechk,kernel.release)
946 
947 
948 # Things we need to do before we recursively start building the kernel
949 # or the modules are listed in "prepare".
950 # A multi level approach is used. prepareN is processed before prepareN-1.
951 # archprepare is used in arch Makefiles and when processed asm symlink,
952 # version.h and scripts_basic is processed / created.
953 
954 # Listed in dependency order
955 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
956 
957 # prepare3 is used to check if we are building in a separate output directory,
958 # and if so do:
959 # 1) Check that make has not been executed in the kernel src $(srctree)
960 prepare3: include/config/kernel.release
961 ifneq ($(KBUILD_SRC),)
962         @$(kecho) '  Using $(srctree) as source for kernel'
963         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
964                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
965                 echo >&2 "  in the '$(srctree)' directory.";\
966                 /bin/false; \
967         fi;
968 endif
969 
970 # prepare2 creates a makefile if using a separate output directory
971 prepare2: prepare3 outputmakefile asm-generic
972 
973 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
974                    include/config/auto.conf
975         $(cmd_crmodverdir)
976 
977 archprepare: archheaders archscripts prepare1 scripts_basic
978 
979 prepare0: archprepare FORCE
980         $(Q)$(MAKE) $(build)=.
981 
982 # All the preparing..
983 prepare: prepare0
984 
985 # Generate some files
986 # ---------------------------------------------------------------------------
987 
988 # KERNELRELEASE can change from a few different places, meaning version.h
989 # needs to be updated, so this check is forced on all builds
990 
991 uts_len := 64
992 define filechk_utsrelease.h
993         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
994           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
995           exit 1;                                                         \
996         fi;                                                               \
997         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
998 endef
999 
1000 define filechk_version.h
1001         (echo \#define LINUX_VERSION_CODE $(shell                         \
1002         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1003         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1004 endef
1005 
1006 $(version_h): $(srctree)/Makefile FORCE
1007         $(call filechk,version.h)
1008 
1009 include/generated/utsrelease.h: include/config/kernel.release FORCE
1010         $(call filechk,utsrelease.h)
1011 
1012 PHONY += headerdep
1013 headerdep:
1014         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1015         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1016 
1017 # ---------------------------------------------------------------------------
1018 
1019 PHONY += depend dep
1020 depend dep:
1021         @echo '*** Warning: make $@ is unnecessary now.'
1022 
1023 # ---------------------------------------------------------------------------
1024 # Firmware install
1025 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1026 export INSTALL_FW_PATH
1027 
1028 PHONY += firmware_install
1029 firmware_install: FORCE
1030         @mkdir -p $(objtree)/firmware
1031         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1032 
1033 # ---------------------------------------------------------------------------
1034 # Kernel headers
1035 
1036 #Default location for installed headers
1037 export INSTALL_HDR_PATH = $(objtree)/usr
1038 
1039 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1040 
1041 # If we do an all arch process set dst to asm-$(hdr-arch)
1042 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1043 
1044 PHONY += archheaders
1045 archheaders:
1046 
1047 PHONY += archscripts
1048 archscripts:
1049 
1050 PHONY += __headers
1051 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1052         $(Q)$(MAKE) $(build)=scripts build_unifdef
1053 
1054 PHONY += headers_install_all
1055 headers_install_all:
1056         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1057 
1058 PHONY += headers_install
1059 headers_install: __headers
1060         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1061           $(error Headers not exportable for the $(SRCARCH) architecture))
1062         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1063         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1064 
1065 PHONY += headers_check_all
1066 headers_check_all: headers_install_all
1067         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1068 
1069 PHONY += headers_check
1070 headers_check: headers_install
1071         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1072         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1073 
1074 # ---------------------------------------------------------------------------
1075 # Kernel selftest
1076 
1077 PHONY += kselftest
1078 kselftest:
1079         $(Q)$(MAKE) -C tools/testing/selftests run_tests
1080 
1081 # ---------------------------------------------------------------------------
1082 # Modules
1083 
1084 ifdef CONFIG_MODULES
1085 
1086 # By default, build modules as well
1087 
1088 all: modules
1089 
1090 # Build modules
1091 #
1092 # A module can be listed more than once in obj-m resulting in
1093 # duplicate lines in modules.order files.  Those are removed
1094 # using awk while concatenating to the final file.
1095 
1096 PHONY += modules
1097 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1098         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1099         @$(kecho) '  Building modules, stage 2.';
1100         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1101         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1102 
1103 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1104         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1105 
1106 %/modules.builtin: include/config/auto.conf
1107         $(Q)$(MAKE) $(modbuiltin)=$*
1108 
1109 
1110 # Target to prepare building external modules
1111 PHONY += modules_prepare
1112 modules_prepare: prepare scripts
1113 
1114 # Target to install modules
1115 PHONY += modules_install
1116 modules_install: _modinst_ _modinst_post
1117 
1118 PHONY += _modinst_
1119 _modinst_:
1120         @rm -rf $(MODLIB)/kernel
1121         @rm -f $(MODLIB)/source
1122         @mkdir -p $(MODLIB)/kernel
1123         @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1124         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1125                 rm -f $(MODLIB)/build ; \
1126                 ln -s $(CURDIR) $(MODLIB)/build ; \
1127         fi
1128         @cp -f $(objtree)/modules.order $(MODLIB)/
1129         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1130         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1131 
1132 # This depmod is only for convenience to give the initial
1133 # boot a modules.dep even before / is mounted read-write.  However the
1134 # boot script depmod is the master version.
1135 PHONY += _modinst_post
1136 _modinst_post: _modinst_
1137         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1138         $(call cmd,depmod)
1139 
1140 ifeq ($(CONFIG_MODULE_SIG), y)
1141 PHONY += modules_sign
1142 modules_sign:
1143         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1144 endif
1145 
1146 else # CONFIG_MODULES
1147 
1148 # Modules not configured
1149 # ---------------------------------------------------------------------------
1150 
1151 modules modules_install: FORCE
1152         @echo >&2
1153         @echo >&2 "The present kernel configuration has modules disabled."
1154         @echo >&2 "Type 'make config' and enable loadable module support."
1155         @echo >&2 "Then build a kernel with module support enabled."
1156         @echo >&2
1157         @exit 1
1158 
1159 endif # CONFIG_MODULES
1160 
1161 ###
1162 # Cleaning is done on three levels.
1163 # make clean     Delete most generated files
1164 #                Leave enough to build external modules
1165 # make mrproper  Delete the current configuration, and all generated files
1166 # make distclean Remove editor backup files, patch leftover files and the like
1167 
1168 # Directories & files removed with 'make clean'
1169 CLEAN_DIRS  += $(MODVERDIR)
1170 
1171 # Directories & files removed with 'make mrproper'
1172 MRPROPER_DIRS  += include/config usr/include include/generated          \
1173                   arch/*/include/generated .tmp_objdiff
1174 MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1175                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1176                   signing_key.priv signing_key.x509 x509.genkey         \
1177                   extra_certificates signing_key.x509.keyid             \
1178                   signing_key.x509.signer include/linux/version.h
1179 
1180 # clean - Delete most, but leave enough to build external modules
1181 #
1182 clean: rm-dirs  := $(CLEAN_DIRS)
1183 clean: rm-files := $(CLEAN_FILES)
1184 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1185 
1186 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1187 $(clean-dirs):
1188         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1189 
1190 vmlinuxclean:
1191         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1192 
1193 clean: archclean vmlinuxclean
1194 
1195 # mrproper - Delete all generated files, including .config
1196 #
1197 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1198 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1199 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1200 
1201 PHONY += $(mrproper-dirs) mrproper archmrproper
1202 $(mrproper-dirs):
1203         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1204 
1205 mrproper: clean archmrproper $(mrproper-dirs)
1206         $(call cmd,rmdirs)
1207         $(call cmd,rmfiles)
1208 
1209 # distclean
1210 #
1211 PHONY += distclean
1212 
1213 distclean: mrproper
1214         @find $(srctree) $(RCS_FIND_IGNORE) \
1215                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1216                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1217                 -o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
1218                 -type f -print | xargs rm -f
1219 
1220 
1221 # Packaging of the kernel to various formats
1222 # ---------------------------------------------------------------------------
1223 # rpm target kept for backward compatibility
1224 package-dir     := scripts/package
1225 
1226 %src-pkg: FORCE
1227         $(Q)$(MAKE) $(build)=$(package-dir) $@
1228 %pkg: include/config/kernel.release FORCE
1229         $(Q)$(MAKE) $(build)=$(package-dir) $@
1230 rpm: include/config/kernel.release FORCE
1231         $(Q)$(MAKE) $(build)=$(package-dir) $@
1232 
1233 
1234 # Brief documentation of the typical targets used
1235 # ---------------------------------------------------------------------------
1236 
1237 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1238 boards := $(notdir $(boards))
1239 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1240 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1241 
1242 help:
1243         @echo  'Cleaning targets:'
1244         @echo  '  clean           - Remove most generated files but keep the config and'
1245         @echo  '                    enough build support to build external modules'
1246         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1247         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1248         @echo  ''
1249         @echo  'Configuration targets:'
1250         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1251         @echo  ''
1252         @echo  'Other generic targets:'
1253         @echo  '  all             - Build all targets marked with [*]'
1254         @echo  '* vmlinux         - Build the bare kernel'
1255         @echo  '* modules         - Build all modules'
1256         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1257         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1258         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1259         @echo  '  dir/            - Build all files in dir and below'
1260         @echo  '  dir/file.[oisS] - Build specified target only'
1261         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1262         @echo  '                    (requires a recent binutils and recent build (System.map))'
1263         @echo  '  dir/file.ko     - Build module including final link'
1264         @echo  '  modules_prepare - Set up for building external modules'
1265         @echo  '  tags/TAGS       - Generate tags file for editors'
1266         @echo  '  cscope          - Generate cscope index'
1267         @echo  '  gtags           - Generate GNU GLOBAL index'
1268         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1269         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1270         @echo  '  image_name      - Output the image name (use with make -s)'
1271         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1272          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1273          echo  ''
1274         @echo  'Static analysers'
1275         @echo  '  checkstack      - Generate a list of stack hogs'
1276         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1277         @echo  '  versioncheck    - Sanity check on version.h usage'
1278         @echo  '  includecheck    - Check for duplicate included header files'
1279         @echo  '  export_report   - List the usages of all exported symbols'
1280         @echo  '  headers_check   - Sanity check on exported headers'
1281         @echo  '  headerdep       - Detect inclusion cycles in headers'
1282         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1283         @echo  ''
1284         @echo  'Kernel selftest'
1285         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1286         @echo  '                    Build, install, and boot kernel before'
1287         @echo  '                    running kselftest on it'
1288         @echo  ''
1289         @echo  'Kernel packaging:'
1290         @$(MAKE) $(build)=$(package-dir) help
1291         @echo  ''
1292         @echo  'Documentation targets:'
1293         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1294         @echo  ''
1295         @echo  'Architecture specific targets ($(SRCARCH)):'
1296         @$(if $(archhelp),$(archhelp),\
1297                 echo '  No architecture specific help defined for $(SRCARCH)')
1298         @echo  ''
1299         @$(if $(boards), \
1300                 $(foreach b, $(boards), \
1301                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1302                 echo '')
1303         @$(if $(board-dirs), \
1304                 $(foreach b, $(board-dirs), \
1305                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1306                 printf "  %-16s - Show all of the above\\n" help-boards; \
1307                 echo '')
1308 
1309         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1310         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1311         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1312         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1313         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1314         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1315         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1316         @echo  '                1: warnings which may be relevant and do not occur too often'
1317         @echo  '                2: warnings which occur quite often but may still be relevant'
1318         @echo  '                3: more obscure warnings, can most likely be ignored'
1319         @echo  '                Multiple levels can be combined with W=12 or W=123'
1320         @echo  ''
1321         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1322         @echo  'For further info see the ./README file'
1323 
1324 
1325 help-board-dirs := $(addprefix help-,$(board-dirs))
1326 
1327 help-boards: $(help-board-dirs)
1328 
1329 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1330 
1331 $(help-board-dirs): help-%:
1332         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1333         @$(if $(boards-per-dir), \
1334                 $(foreach b, $(boards-per-dir), \
1335                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1336                 echo '')
1337 
1338 
1339 # Documentation targets
1340 # ---------------------------------------------------------------------------
1341 %docs: scripts_basic FORCE
1342         $(Q)$(MAKE) $(build)=scripts build_docproc
1343         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1344 
1345 else # KBUILD_EXTMOD
1346 
1347 ###
1348 # External module support.
1349 # When building external modules the kernel used as basis is considered
1350 # read-only, and no consistency checks are made and the make
1351 # system is not used on the basis kernel. If updates are required
1352 # in the basis kernel ordinary make commands (without M=...) must
1353 # be used.
1354 #
1355 # The following are the only valid targets when building external
1356 # modules.
1357 # make M=dir clean     Delete all automatically generated files
1358 # make M=dir modules   Make all modules in specified dir
1359 # make M=dir           Same as 'make M=dir modules'
1360 # make M=dir modules_install
1361 #                      Install the modules built in the module directory
1362 #                      Assumes install directory is already created
1363 
1364 # We are always building modules
1365 KBUILD_MODULES := 1
1366 PHONY += crmodverdir
1367 crmodverdir:
1368         $(cmd_crmodverdir)
1369 
1370 PHONY += $(objtree)/Module.symvers
1371 $(objtree)/Module.symvers:
1372         @test -e $(objtree)/Module.symvers || ( \
1373         echo; \
1374         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1375         echo "           is missing; modules will have no dependencies and modversions."; \
1376         echo )
1377 
1378 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1379 PHONY += $(module-dirs) modules
1380 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1381         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1382 
1383 modules: $(module-dirs)
1384         @$(kecho) '  Building modules, stage 2.';
1385         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1386 
1387 PHONY += modules_install
1388 modules_install: _emodinst_ _emodinst_post
1389 
1390 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1391 PHONY += _emodinst_
1392 _emodinst_:
1393         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1394         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1395 
1396 PHONY += _emodinst_post
1397 _emodinst_post: _emodinst_
1398         $(call cmd,depmod)
1399 
1400 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1401 
1402 PHONY += $(clean-dirs) clean
1403 $(clean-dirs):
1404         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1405 
1406 clean:  rm-dirs := $(MODVERDIR)
1407 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1408 
1409 help:
1410         @echo  '  Building external modules.'
1411         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1412         @echo  ''
1413         @echo  '  modules         - default target, build the module(s)'
1414         @echo  '  modules_install - install the module'
1415         @echo  '  clean           - remove generated files in module directory only'
1416         @echo  ''
1417 
1418 # Dummies...
1419 PHONY += prepare scripts
1420 prepare: ;
1421 scripts: ;
1422 endif # KBUILD_EXTMOD
1423 
1424 clean: $(clean-dirs)
1425         $(call cmd,rmdirs)
1426         $(call cmd,rmfiles)
1427         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1428                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1429                 -o -name '*.ko.*' \
1430                 -o -name '*.dwo'  \
1431                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1432                 -o -name '*.symtypes' -o -name 'modules.order' \
1433                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1434                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1435 
1436 # Generate tags for editors
1437 # ---------------------------------------------------------------------------
1438 quiet_cmd_tags = GEN     $@
1439       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1440 
1441 tags TAGS cscope gtags: FORCE
1442         $(call cmd,tags)
1443 
1444 # Scripts to check various things for consistency
1445 # ---------------------------------------------------------------------------
1446 
1447 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1448 
1449 includecheck:
1450         find $(srctree)/* $(RCS_FIND_IGNORE) \
1451                 -name '*.[hcS]' -type f -print | sort \
1452                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1453 
1454 versioncheck:
1455         find $(srctree)/* $(RCS_FIND_IGNORE) \
1456                 -name '*.[hcS]' -type f -print | sort \
1457                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1458 
1459 coccicheck:
1460         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1461 
1462 namespacecheck:
1463         $(PERL) $(srctree)/scripts/namespace.pl
1464 
1465 export_report:
1466         $(PERL) $(srctree)/scripts/export_report.pl
1467 
1468 endif #ifeq ($(config-targets),1)
1469 endif #ifeq ($(mixed-targets),1)
1470 
1471 PHONY += checkstack kernelrelease kernelversion image_name
1472 
1473 # UML needs a little special treatment here.  It wants to use the host
1474 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1475 # else wants $(ARCH), including people doing cross-builds, which means
1476 # that $(SUBARCH) doesn't work here.
1477 ifeq ($(ARCH), um)
1478 CHECKSTACK_ARCH := $(SUBARCH)
1479 else
1480 CHECKSTACK_ARCH := $(ARCH)
1481 endif
1482 checkstack:
1483         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1484         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1485 
1486 kernelrelease:
1487         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1488 
1489 kernelversion:
1490         @echo $(KERNELVERSION)
1491 
1492 image_name:
1493         @echo $(KBUILD_IMAGE)
1494 
1495 # Clear a bunch of variables before executing the submake
1496 tools/: FORCE
1497         $(Q)mkdir -p $(objtree)/tools
1498         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1499 
1500 tools/%: FORCE
1501         $(Q)mkdir -p $(objtree)/tools
1502         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1503 
1504 # Single targets
1505 # ---------------------------------------------------------------------------
1506 # Single targets are compatible with:
1507 # - build with mixed source and output
1508 # - build with separate output dir 'make O=...'
1509 # - external modules
1510 #
1511 #  target-dir => where to store outputfile
1512 #  build-dir  => directory in kernel source tree to use
1513 
1514 ifeq ($(KBUILD_EXTMOD),)
1515         build-dir  = $(patsubst %/,%,$(dir $@))
1516         target-dir = $(dir $@)
1517 else
1518         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1519         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1520         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1521 endif
1522 
1523 %.s: %.c prepare scripts FORCE
1524         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1525 %.i: %.c prepare scripts FORCE
1526         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1527 %.o: %.c prepare scripts FORCE
1528         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1529 %.lst: %.c prepare scripts FORCE
1530         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1531 %.s: %.S prepare scripts FORCE
1532         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1533 %.o: %.S prepare scripts FORCE
1534         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1535 %.symtypes: %.c prepare scripts FORCE
1536         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1537 
1538 # Modules
1539 /: prepare scripts FORCE
1540         $(cmd_crmodverdir)
1541         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1542         $(build)=$(build-dir)
1543 # Make sure the latest headers are built for Documentation
1544 Documentation/: headers_install
1545 %/: prepare scripts FORCE
1546         $(cmd_crmodverdir)
1547         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1548         $(build)=$(build-dir)
1549 %.ko: prepare scripts FORCE
1550         $(cmd_crmodverdir)
1551         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1552         $(build)=$(build-dir) $(@:.ko=.o)
1553         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1554 
1555 # FIXME Should go into a make.lib or something
1556 # ===========================================================================
1557 
1558 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1559       cmd_rmdirs = rm -rf $(rm-dirs)
1560 
1561 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1562       cmd_rmfiles = rm -f $(rm-files)
1563 
1564 # Run depmod only if we have System.map and depmod is executable
1565 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1566       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1567                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1568 
1569 # Create temporary dir for module support files
1570 # clean it up only when building all modules
1571 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1572                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1573 
1574 # read all saved command lines
1575 
1576 targets := $(wildcard $(sort $(targets)))
1577 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1578 
1579 ifneq ($(cmd_files),)
1580   $(cmd_files): ;       # Do not try to update included dependency files
1581   include $(cmd_files)
1582 endif
1583 
1584 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1585 # Usage:
1586 # $(Q)$(MAKE) $(clean)=dir
1587 clean := -f $(srctree)/scripts/Makefile.clean obj
1588 
1589 endif   # skip-makefile
1590 
1591 PHONY += FORCE
1592 FORCE:
1593 
1594 # Declare the contents of the .PHONY variable as phony.  We keep that
1595 # information in a variable so we can use it in if_changed and friends.
1596 .PHONY: $(PHONY)

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