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 = 6
  3 SUBLEVEL = 0
  4 EXTRAVERSION =
  5 NAME = Charred Weasel
  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 # 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 # We need some generic definitions (do not try to remake the file).
339 scripts/Kbuild.include: ;
340 include scripts/Kbuild.include
341 
342 # Make variables (CC, etc...)
343 AS              = $(CROSS_COMPILE)as
344 LD              = $(CROSS_COMPILE)ld
345 CC              = $(CROSS_COMPILE)gcc
346 CPP             = $(CC) -E
347 AR              = $(CROSS_COMPILE)ar
348 NM              = $(CROSS_COMPILE)nm
349 STRIP           = $(CROSS_COMPILE)strip
350 OBJCOPY         = $(CROSS_COMPILE)objcopy
351 OBJDUMP         = $(CROSS_COMPILE)objdump
352 AWK             = awk
353 GENKSYMS        = scripts/genksyms/genksyms
354 INSTALLKERNEL  := installkernel
355 DEPMOD          = /sbin/depmod
356 PERL            = perl
357 PYTHON          = python
358 CHECK           = sparse
359 
360 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
361                   -Wbitwise -Wno-return-void $(CF)
362 CFLAGS_MODULE   =
363 AFLAGS_MODULE   =
364 LDFLAGS_MODULE  =
365 CFLAGS_KERNEL   =
366 AFLAGS_KERNEL   =
367 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
368 CFLAGS_KCOV     = -fsanitize-coverage=trace-pc
369 
370 
371 # Use USERINCLUDE when you must reference the UAPI directories only.
372 USERINCLUDE    := \
373                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
374                 -Iarch/$(hdr-arch)/include/generated/uapi \
375                 -I$(srctree)/include/uapi \
376                 -Iinclude/generated/uapi \
377                 -include $(srctree)/include/linux/kconfig.h
378 
379 # Use LINUXINCLUDE when you must reference the include/ directory.
380 # Needed to be compatible with the O= option
381 LINUXINCLUDE    := \
382                 -I$(srctree)/arch/$(hdr-arch)/include \
383                 -Iarch/$(hdr-arch)/include/generated/uapi \
384                 -Iarch/$(hdr-arch)/include/generated \
385                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
386                 -Iinclude \
387                 $(USERINCLUDE)
388 
389 KBUILD_CPPFLAGS := -D__KERNEL__
390 
391 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
392                    -fno-strict-aliasing -fno-common \
393                    -Werror-implicit-function-declaration \
394                    -Wno-format-security \
395                    -std=gnu89
396 
397 KBUILD_AFLAGS_KERNEL :=
398 KBUILD_CFLAGS_KERNEL :=
399 KBUILD_AFLAGS   := -D__ASSEMBLY__
400 KBUILD_AFLAGS_MODULE  := -DMODULE
401 KBUILD_CFLAGS_MODULE  := -DMODULE
402 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
403 
404 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
405 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
406 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
407 
408 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
409 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
410 export CPP AR NM STRIP OBJCOPY OBJDUMP
411 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
412 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
413 
414 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
415 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
416 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
417 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
418 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
419 export KBUILD_ARFLAGS
420 
421 # When compiling out-of-tree modules, put MODVERDIR in the module
422 # tree rather than in the kernel tree. The kernel tree might
423 # even be read-only.
424 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
425 
426 # Files to ignore in find ... statements
427 
428 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
429                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
430                           -prune -o
431 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
432                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
433 
434 # ===========================================================================
435 # Rules shared between *config targets and build targets
436 
437 # Basic helpers built in scripts/
438 PHONY += scripts_basic
439 scripts_basic:
440         $(Q)$(MAKE) $(build)=scripts/basic
441         $(Q)rm -f .tmp_quiet_recordmcount
442 
443 # To avoid any implicit rule to kick in, define an empty command.
444 scripts/basic/%: scripts_basic ;
445 
446 PHONY += outputmakefile
447 # outputmakefile generates a Makefile in the output directory, if using a
448 # separate output directory. This allows convenient use of make in the
449 # output directory.
450 outputmakefile:
451 ifneq ($(KBUILD_SRC),)
452         $(Q)ln -fsn $(srctree) source
453         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
454             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
455 endif
456 
457 # Support for using generic headers in asm-generic
458 PHONY += asm-generic
459 asm-generic:
460         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
461                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
462         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
463                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
464 
465 # To make sure we do not include .config for any of the *config targets
466 # catch them early, and hand them over to scripts/kconfig/Makefile
467 # It is allowed to specify more targets when calling make, including
468 # mixing *config targets and build targets.
469 # For example 'make oldconfig all'.
470 # Detect when mixed targets is specified, and make a second invocation
471 # of make so .config is not included in this case either (for *config).
472 
473 version_h := include/generated/uapi/linux/version.h
474 old_version_h := include/linux/version.h
475 
476 no-dot-config-targets := clean mrproper distclean \
477                          cscope gtags TAGS tags help% %docs check% coccicheck \
478                          $(version_h) headers_% archheaders archscripts \
479                          kernelversion %src-pkg
480 
481 config-targets := 0
482 mixed-targets  := 0
483 dot-config     := 1
484 
485 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
486         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
487                 dot-config := 0
488         endif
489 endif
490 
491 ifeq ($(KBUILD_EXTMOD),)
492         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
493                 config-targets := 1
494                 ifneq ($(words $(MAKECMDGOALS)),1)
495                         mixed-targets := 1
496                 endif
497         endif
498 endif
499 # install and module_install need also be processed one by one
500 ifneq ($(filter install,$(MAKECMDGOALS)),)
501         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
502                 mixed-targets := 1
503         endif
504 endif
505 
506 ifeq ($(mixed-targets),1)
507 # ===========================================================================
508 # We're called with mixed targets (*config and build targets).
509 # Handle them one by one.
510 
511 PHONY += $(MAKECMDGOALS) __build_one_by_one
512 
513 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
514         @:
515 
516 __build_one_by_one:
517         $(Q)set -e; \
518         for i in $(MAKECMDGOALS); do \
519                 $(MAKE) -f $(srctree)/Makefile $$i; \
520         done
521 
522 else
523 ifeq ($(config-targets),1)
524 # ===========================================================================
525 # *config targets only - make sure prerequisites are updated, and descend
526 # in scripts/kconfig to make the *config target
527 
528 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
529 # KBUILD_DEFCONFIG may point out an alternative default configuration
530 # used for 'make defconfig'
531 include arch/$(SRCARCH)/Makefile
532 export KBUILD_DEFCONFIG KBUILD_KCONFIG
533 
534 config: scripts_basic outputmakefile FORCE
535         $(Q)$(MAKE) $(build)=scripts/kconfig $@
536 
537 %config: scripts_basic outputmakefile FORCE
538         $(Q)$(MAKE) $(build)=scripts/kconfig $@
539 
540 else
541 # ===========================================================================
542 # Build targets only - this includes vmlinux, arch specific targets, clean
543 # targets and others. In general all targets except *config targets.
544 
545 ifeq ($(KBUILD_EXTMOD),)
546 # Additional helpers built in scripts/
547 # Carefully list dependencies so we do not try to build scripts twice
548 # in parallel
549 PHONY += scripts
550 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
551          asm-generic
552         $(Q)$(MAKE) $(build)=$(@)
553 
554 # Objects we will link into vmlinux / subdirs we need to visit
555 init-y          := init/
556 drivers-y       := drivers/ sound/ firmware/
557 net-y           := net/
558 libs-y          := lib/
559 core-y          := usr/
560 virt-y          := virt/
561 endif # KBUILD_EXTMOD
562 
563 ifeq ($(dot-config),1)
564 # Read in config
565 -include include/config/auto.conf
566 
567 ifeq ($(KBUILD_EXTMOD),)
568 # Read in dependencies to all Kconfig* files, make sure to run
569 # oldconfig if changes are detected.
570 -include include/config/auto.conf.cmd
571 
572 # To avoid any implicit rule to kick in, define an empty command
573 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
574 
575 # If .config is newer than include/config/auto.conf, someone tinkered
576 # with it and forgot to run make oldconfig.
577 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
578 # we execute the config step to be sure to catch updated Kconfig files
579 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
580         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
581 else
582 # external modules needs include/generated/autoconf.h and include/config/auto.conf
583 # but do not care if they are up-to-date. Use auto.conf to trigger the test
584 PHONY += include/config/auto.conf
585 
586 include/config/auto.conf:
587         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
588         echo >&2;                                                       \
589         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
590         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
591         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
592         echo >&2 ;                                                      \
593         /bin/false)
594 
595 endif # KBUILD_EXTMOD
596 
597 else
598 # Dummy target needed, because used as prerequisite
599 include/config/auto.conf: ;
600 endif # $(dot-config)
601 
602 # The all: target is the default when no target is given on the
603 # command line.
604 # This allow a user to issue only 'make' to build a kernel including modules
605 # Defaults to vmlinux, but the arch makefile usually adds further targets
606 all: vmlinux
607 
608 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
609 # values of the respective KBUILD_* variables
610 ARCH_CPPFLAGS :=
611 ARCH_AFLAGS :=
612 ARCH_CFLAGS :=
613 include arch/$(SRCARCH)/Makefile
614 
615 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
616 
617 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
618 KBUILD_CFLAGS   += -Os $(call cc-disable-warning,maybe-uninitialized,)
619 else
620 KBUILD_CFLAGS   += -O2
621 endif
622 
623 # Tell gcc to never replace conditional load with a non-conditional one
624 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
625 
626 ifdef CONFIG_READABLE_ASM
627 # Disable optimizations that make assembler listings hard to read.
628 # reorder blocks reorders the control in the function
629 # ipa clone creates specialized cloned functions
630 # partial inlining inlines only parts of functions
631 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
632                  $(call cc-option,-fno-ipa-cp-clone,) \
633                  $(call cc-option,-fno-partial-inlining)
634 endif
635 
636 ifneq ($(CONFIG_FRAME_WARN),0)
637 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
638 endif
639 
640 # Handle stack protector mode.
641 #
642 # Since kbuild can potentially perform two passes (first with the old
643 # .config values and then with updated .config values), we cannot error out
644 # if a desired compiler option is unsupported. If we were to error, kbuild
645 # could never get to the second pass and actually notice that we changed
646 # the option to something that was supported.
647 #
648 # Additionally, we don't want to fallback and/or silently change which compiler
649 # flags will be used, since that leads to producing kernels with different
650 # security feature characteristics depending on the compiler used. ("But I
651 # selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
652 #
653 # The middle ground is to warn here so that the failed option is obvious, but
654 # to let the build fail with bad compiler flags so that we can't produce a
655 # kernel when there is a CONFIG and compiler mismatch.
656 #
657 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
658   stackp-flag := -fstack-protector
659   ifeq ($(call cc-option, $(stackp-flag)),)
660     $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
661              -fstack-protector not supported by compiler)
662   endif
663 else
664 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
665   stackp-flag := -fstack-protector-strong
666   ifeq ($(call cc-option, $(stackp-flag)),)
667     $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
668               -fstack-protector-strong not supported by compiler)
669   endif
670 else
671   # Force off for distro compilers that enable stack protector by default.
672   stackp-flag := $(call cc-option, -fno-stack-protector)
673 endif
674 endif
675 KBUILD_CFLAGS += $(stackp-flag)
676 
677 ifdef CONFIG_KCOV
678   ifeq ($(call cc-option, $(CFLAGS_KCOV)),)
679     $(warning Cannot use CONFIG_KCOV: \
680              -fsanitize-coverage=trace-pc is not supported by compiler)
681     CFLAGS_KCOV =
682   endif
683 endif
684 
685 ifeq ($(cc-name),clang)
686 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
687 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
688 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
689 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
690 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
691 # Quiet clang warning: comparison of unsigned expression < 0 is always false
692 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
693 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
694 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
695 # See modpost pattern 2
696 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
697 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
698 else
699 
700 # This warning generated too much noise in a regular build.
701 # Use make W=1 to enable this warning (see scripts/Makefile.build)
702 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
703 endif
704 
705 ifdef CONFIG_FRAME_POINTER
706 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
707 else
708 # Some targets (ARM with Thumb2, for example), can't be built with frame
709 # pointers.  For those, we don't have FUNCTION_TRACER automatically
710 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
711 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
712 # -fomit-frame-pointer with FUNCTION_TRACER.
713 ifndef CONFIG_FUNCTION_TRACER
714 KBUILD_CFLAGS   += -fomit-frame-pointer
715 endif
716 endif
717 
718 KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
719 
720 ifdef CONFIG_DEBUG_INFO
721 ifdef CONFIG_DEBUG_INFO_SPLIT
722 KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
723 else
724 KBUILD_CFLAGS   += -g
725 endif
726 KBUILD_AFLAGS   += -Wa,-gdwarf-2
727 endif
728 ifdef CONFIG_DEBUG_INFO_DWARF4
729 KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
730 endif
731 
732 ifdef CONFIG_DEBUG_INFO_REDUCED
733 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
734                    $(call cc-option,-fno-var-tracking)
735 endif
736 
737 ifdef CONFIG_FUNCTION_TRACER
738 ifndef CC_FLAGS_FTRACE
739 CC_FLAGS_FTRACE := -pg
740 endif
741 export CC_FLAGS_FTRACE
742 ifdef CONFIG_HAVE_FENTRY
743 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
744 endif
745 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
746 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
747 ifdef CONFIG_DYNAMIC_FTRACE
748         ifdef CONFIG_HAVE_C_RECORDMCOUNT
749                 BUILD_C_RECORDMCOUNT := y
750                 export BUILD_C_RECORDMCOUNT
751         endif
752 endif
753 endif
754 
755 # We trigger additional mismatches with less inlining
756 ifdef CONFIG_DEBUG_SECTION_MISMATCH
757 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
758 endif
759 
760 # arch Makefile may override CC so keep this after arch Makefile is included
761 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
762 CHECKFLAGS     += $(NOSTDINC_FLAGS)
763 
764 # warn about C99 declaration after statement
765 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
766 
767 # disable pointer signed / unsigned warnings in gcc 4.0
768 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
769 
770 # disable invalid "can't wrap" optimizations for signed / pointers
771 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
772 
773 # conserve stack if available
774 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
775 
776 # disallow errors like 'EXPORT_GPL(foo);' with missing header
777 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
778 
779 # require functions to have arguments in prototypes, not empty 'int foo()'
780 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
781 
782 # Prohibit date/time macros, which would make the build non-deterministic
783 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
784 
785 # enforce correct pointer usage
786 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
787 
788 # use the deterministic mode of AR if available
789 KBUILD_ARFLAGS := $(call ar-option,D)
790 
791 # check for 'asm goto'
792 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
793         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
794         KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
795 endif
796 
797 include scripts/Makefile.kasan
798 include scripts/Makefile.extrawarn
799 include scripts/Makefile.ubsan
800 
801 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
802 # last assignments
803 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
804 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
805 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
806 
807 # Use --build-id when available.
808 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
809                               $(call cc-ldoption, -Wl$(comma)--build-id,))
810 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
811 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
812 
813 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
814 LDFLAGS_vmlinux += $(call ld-option, -X,)
815 endif
816 
817 # Default kernel image to build when no specific target is given.
818 # KBUILD_IMAGE may be overruled on the command line or
819 # set in the environment
820 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
821 # this default value
822 export KBUILD_IMAGE ?= vmlinux
823 
824 #
825 # INSTALL_PATH specifies where to place the updated kernel and system map
826 # images. Default is /boot, but you can set it to other values
827 export  INSTALL_PATH ?= /boot
828 
829 #
830 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
831 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
832 # an argument if needed. Otherwise it defaults to the kernel install path
833 #
834 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
835 
836 #
837 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
838 # relocations required by build roots.  This is not defined in the
839 # makefile but the argument can be passed to make if needed.
840 #
841 
842 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
843 export MODLIB
844 
845 #
846 # INSTALL_MOD_STRIP, if defined, will cause modules to be
847 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
848 # the default option --strip-debug will be used.  Otherwise,
849 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
850 
851 ifdef INSTALL_MOD_STRIP
852 ifeq ($(INSTALL_MOD_STRIP),1)
853 mod_strip_cmd = $(STRIP) --strip-debug
854 else
855 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
856 endif # INSTALL_MOD_STRIP=1
857 else
858 mod_strip_cmd = true
859 endif # INSTALL_MOD_STRIP
860 export mod_strip_cmd
861 
862 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
863 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
864 # or CONFIG_MODULE_COMPRESS_XZ.
865 
866 mod_compress_cmd = true
867 ifdef CONFIG_MODULE_COMPRESS
868   ifdef CONFIG_MODULE_COMPRESS_GZIP
869     mod_compress_cmd = gzip -n -f
870   endif # CONFIG_MODULE_COMPRESS_GZIP
871   ifdef CONFIG_MODULE_COMPRESS_XZ
872     mod_compress_cmd = xz -f
873   endif # CONFIG_MODULE_COMPRESS_XZ
874 endif # CONFIG_MODULE_COMPRESS
875 export mod_compress_cmd
876 
877 # Select initial ramdisk compression format, default is gzip(1).
878 # This shall be used by the dracut(8) tool while creating an initramfs image.
879 #
880 INITRD_COMPRESS-y                  := gzip
881 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
882 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
883 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
884 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
885 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
886 # do not export INITRD_COMPRESS, since we didn't actually
887 # choose a sane default compression above.
888 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
889 
890 ifdef CONFIG_MODULE_SIG_ALL
891 $(eval $(call config_filename,MODULE_SIG_KEY))
892 
893 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
894 else
895 mod_sign_cmd = true
896 endif
897 export mod_sign_cmd
898 
899 
900 ifeq ($(KBUILD_EXTMOD),)
901 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
902 
903 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
904                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
905                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
906 
907 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
908                      $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
909 
910 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
911 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
912 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
913 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
914 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
915 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
916 libs-y          := $(libs-y1) $(libs-y2)
917 virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
918 
919 # Externally visible symbols (used by link-vmlinux.sh)
920 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
921 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
922 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
923 export LDFLAGS_vmlinux
924 # used by scripts/pacmage/Makefile
925 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
926 
927 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
928 
929 # Final link of vmlinux
930       cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
931 quiet_cmd_link-vmlinux = LINK    $@
932 
933 # Include targets which we want to
934 # execute if the rest of the kernel build went well.
935 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
936 ifdef CONFIG_HEADERS_CHECK
937         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
938 endif
939 ifdef CONFIG_SAMPLES
940         $(Q)$(MAKE) $(build)=samples
941 endif
942 ifdef CONFIG_BUILD_DOCSRC
943         $(Q)$(MAKE) $(build)=Documentation
944 endif
945 ifdef CONFIG_GDB_SCRIPTS
946         $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
947 endif
948         +$(call if_changed,link-vmlinux)
949 
950 # The actual objects are generated when descending,
951 # make sure no implicit rule kicks in
952 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
953 
954 # Handle descending into subdirectories listed in $(vmlinux-dirs)
955 # Preset locale variables to speed up the build process. Limit locale
956 # tweaks to this spot to avoid wrong language settings when running
957 # make menuconfig etc.
958 # Error messages still appears in the original language
959 
960 PHONY += $(vmlinux-dirs)
961 $(vmlinux-dirs): prepare scripts
962         $(Q)$(MAKE) $(build)=$@
963 
964 define filechk_kernel.release
965         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
966 endef
967 
968 # Store (new) KERNELRELEASE string in include/config/kernel.release
969 include/config/kernel.release: include/config/auto.conf FORCE
970         $(call filechk,kernel.release)
971 
972 
973 # Things we need to do before we recursively start building the kernel
974 # or the modules are listed in "prepare".
975 # A multi level approach is used. prepareN is processed before prepareN-1.
976 # archprepare is used in arch Makefiles and when processed asm symlink,
977 # version.h and scripts_basic is processed / created.
978 
979 # Listed in dependency order
980 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
981 
982 # prepare3 is used to check if we are building in a separate output directory,
983 # and if so do:
984 # 1) Check that make has not been executed in the kernel src $(srctree)
985 prepare3: include/config/kernel.release
986 ifneq ($(KBUILD_SRC),)
987         @$(kecho) '  Using $(srctree) as source for kernel'
988         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
989                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
990                 echo >&2 "  in the '$(srctree)' directory.";\
991                 /bin/false; \
992         fi;
993 endif
994 
995 # prepare2 creates a makefile if using a separate output directory
996 prepare2: prepare3 outputmakefile asm-generic
997 
998 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
999                    include/config/auto.conf
1000         $(cmd_crmodverdir)
1001 
1002 archprepare: archheaders archscripts prepare1 scripts_basic
1003 
1004 prepare0: archprepare FORCE
1005         $(Q)$(MAKE) $(build)=.
1006 
1007 # All the preparing..
1008 prepare: prepare0 prepare-objtool
1009 
1010 ifdef CONFIG_STACK_VALIDATION
1011   has_libelf := $(call try-run,\
1012                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
1013   ifeq ($(has_libelf),1)
1014     objtool_target := tools/objtool FORCE
1015   else
1016     $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev or elfutils-libelf-devel")
1017     SKIP_STACK_VALIDATION := 1
1018     export SKIP_STACK_VALIDATION
1019   endif
1020 endif
1021 
1022 PHONY += prepare-objtool
1023 prepare-objtool: $(objtool_target)
1024 
1025 # Generate some files
1026 # ---------------------------------------------------------------------------
1027 
1028 # KERNELRELEASE can change from a few different places, meaning version.h
1029 # needs to be updated, so this check is forced on all builds
1030 
1031 uts_len := 64
1032 define filechk_utsrelease.h
1033         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1034           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1035           exit 1;                                                         \
1036         fi;                                                               \
1037         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1038 endef
1039 
1040 define filechk_version.h
1041         (echo \#define LINUX_VERSION_CODE $(shell                         \
1042         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1043         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1044 endef
1045 
1046 $(version_h): $(srctree)/Makefile FORCE
1047         $(call filechk,version.h)
1048         $(Q)rm -f $(old_version_h)
1049 
1050 include/generated/utsrelease.h: include/config/kernel.release FORCE
1051         $(call filechk,utsrelease.h)
1052 
1053 PHONY += headerdep
1054 headerdep:
1055         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1056         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1057 
1058 # ---------------------------------------------------------------------------
1059 # Firmware install
1060 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1061 export INSTALL_FW_PATH
1062 
1063 PHONY += firmware_install
1064 firmware_install: FORCE
1065         @mkdir -p $(objtree)/firmware
1066         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1067 
1068 # ---------------------------------------------------------------------------
1069 # Kernel headers
1070 
1071 #Default location for installed headers
1072 export INSTALL_HDR_PATH = $(objtree)/usr
1073 
1074 # If we do an all arch process set dst to asm-$(hdr-arch)
1075 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1076 
1077 PHONY += archheaders
1078 archheaders:
1079 
1080 PHONY += archscripts
1081 archscripts:
1082 
1083 PHONY += __headers
1084 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1085         $(Q)$(MAKE) $(build)=scripts build_unifdef
1086 
1087 PHONY += headers_install_all
1088 headers_install_all:
1089         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1090 
1091 PHONY += headers_install
1092 headers_install: __headers
1093         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1094           $(error Headers not exportable for the $(SRCARCH) architecture))
1095         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1096         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1097 
1098 PHONY += headers_check_all
1099 headers_check_all: headers_install_all
1100         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1101 
1102 PHONY += headers_check
1103 headers_check: headers_install
1104         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1105         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1106 
1107 # ---------------------------------------------------------------------------
1108 # Kernel selftest
1109 
1110 PHONY += kselftest
1111 kselftest:
1112         $(Q)$(MAKE) -C tools/testing/selftests run_tests
1113 
1114 kselftest-clean:
1115         $(Q)$(MAKE) -C tools/testing/selftests clean
1116 
1117 PHONY += kselftest-merge
1118 kselftest-merge:
1119         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1120         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1121                 -m $(objtree)/.config \
1122                 $(srctree)/tools/testing/selftests/*/config
1123         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1124 
1125 # ---------------------------------------------------------------------------
1126 # Modules
1127 
1128 ifdef CONFIG_MODULES
1129 
1130 # By default, build modules as well
1131 
1132 all: modules
1133 
1134 # Build modules
1135 #
1136 # A module can be listed more than once in obj-m resulting in
1137 # duplicate lines in modules.order files.  Those are removed
1138 # using awk while concatenating to the final file.
1139 
1140 PHONY += modules
1141 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1142         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1143         @$(kecho) '  Building modules, stage 2.';
1144         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1145         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1146 
1147 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1148         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1149 
1150 %/modules.builtin: include/config/auto.conf
1151         $(Q)$(MAKE) $(modbuiltin)=$*
1152 
1153 
1154 # Target to prepare building external modules
1155 PHONY += modules_prepare
1156 modules_prepare: prepare scripts
1157 
1158 # Target to install modules
1159 PHONY += modules_install
1160 modules_install: _modinst_ _modinst_post
1161 
1162 PHONY += _modinst_
1163 _modinst_:
1164         @rm -rf $(MODLIB)/kernel
1165         @rm -f $(MODLIB)/source
1166         @mkdir -p $(MODLIB)/kernel
1167         @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1168         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1169                 rm -f $(MODLIB)/build ; \
1170                 ln -s $(CURDIR) $(MODLIB)/build ; \
1171         fi
1172         @cp -f $(objtree)/modules.order $(MODLIB)/
1173         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1174         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1175 
1176 # This depmod is only for convenience to give the initial
1177 # boot a modules.dep even before / is mounted read-write.  However the
1178 # boot script depmod is the master version.
1179 PHONY += _modinst_post
1180 _modinst_post: _modinst_
1181         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1182         $(call cmd,depmod)
1183 
1184 ifeq ($(CONFIG_MODULE_SIG), y)
1185 PHONY += modules_sign
1186 modules_sign:
1187         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1188 endif
1189 
1190 else # CONFIG_MODULES
1191 
1192 # Modules not configured
1193 # ---------------------------------------------------------------------------
1194 
1195 modules modules_install: FORCE
1196         @echo >&2
1197         @echo >&2 "The present kernel configuration has modules disabled."
1198         @echo >&2 "Type 'make config' and enable loadable module support."
1199         @echo >&2 "Then build a kernel with module support enabled."
1200         @echo >&2
1201         @exit 1
1202 
1203 endif # CONFIG_MODULES
1204 
1205 ###
1206 # Cleaning is done on three levels.
1207 # make clean     Delete most generated files
1208 #                Leave enough to build external modules
1209 # make mrproper  Delete the current configuration, and all generated files
1210 # make distclean Remove editor backup files, patch leftover files and the like
1211 
1212 # Directories & files removed with 'make clean'
1213 CLEAN_DIRS  += $(MODVERDIR)
1214 
1215 # Directories & files removed with 'make mrproper'
1216 MRPROPER_DIRS  += include/config usr/include include/generated          \
1217                   arch/*/include/generated .tmp_objdiff
1218 MRPROPER_FILES += .config .config.old .version .old_version \
1219                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1220                   signing_key.pem signing_key.priv signing_key.x509     \
1221                   x509.genkey extra_certificates signing_key.x509.keyid \
1222                   signing_key.x509.signer vmlinux-gdb.py
1223 
1224 # clean - Delete most, but leave enough to build external modules
1225 #
1226 clean: rm-dirs  := $(CLEAN_DIRS)
1227 clean: rm-files := $(CLEAN_FILES)
1228 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1229 
1230 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1231 $(clean-dirs):
1232         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1233 
1234 vmlinuxclean:
1235         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1236 
1237 clean: archclean vmlinuxclean
1238 
1239 # mrproper - Delete all generated files, including .config
1240 #
1241 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1242 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1243 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1244 
1245 PHONY += $(mrproper-dirs) mrproper archmrproper
1246 $(mrproper-dirs):
1247         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1248 
1249 mrproper: clean archmrproper $(mrproper-dirs)
1250         $(call cmd,rmdirs)
1251         $(call cmd,rmfiles)
1252 
1253 # distclean
1254 #
1255 PHONY += distclean
1256 
1257 distclean: mrproper
1258         @find $(srctree) $(RCS_FIND_IGNORE) \
1259                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1260                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1261                 -o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
1262                 -type f -print | xargs rm -f
1263 
1264 
1265 # Packaging of the kernel to various formats
1266 # ---------------------------------------------------------------------------
1267 # rpm target kept for backward compatibility
1268 package-dir     := scripts/package
1269 
1270 %src-pkg: FORCE
1271         $(Q)$(MAKE) $(build)=$(package-dir) $@
1272 %pkg: include/config/kernel.release FORCE
1273         $(Q)$(MAKE) $(build)=$(package-dir) $@
1274 rpm: include/config/kernel.release FORCE
1275         $(Q)$(MAKE) $(build)=$(package-dir) $@
1276 
1277 
1278 # Brief documentation of the typical targets used
1279 # ---------------------------------------------------------------------------
1280 
1281 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1282 boards := $(sort $(notdir $(boards)))
1283 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1284 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1285 
1286 help:
1287         @echo  'Cleaning targets:'
1288         @echo  '  clean           - Remove most generated files but keep the config and'
1289         @echo  '                    enough build support to build external modules'
1290         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1291         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1292         @echo  ''
1293         @echo  'Configuration targets:'
1294         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1295         @echo  ''
1296         @echo  'Other generic targets:'
1297         @echo  '  all             - Build all targets marked with [*]'
1298         @echo  '* vmlinux         - Build the bare kernel'
1299         @echo  '* modules         - Build all modules'
1300         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1301         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1302         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1303         @echo  '  dir/            - Build all files in dir and below'
1304         @echo  '  dir/file.[ois]  - Build specified target only'
1305         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1306         @echo  '                    (requires a recent binutils and recent build (System.map))'
1307         @echo  '  dir/file.ko     - Build module including final link'
1308         @echo  '  modules_prepare - Set up for building external modules'
1309         @echo  '  tags/TAGS       - Generate tags file for editors'
1310         @echo  '  cscope          - Generate cscope index'
1311         @echo  '  gtags           - Generate GNU GLOBAL index'
1312         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1313         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1314         @echo  '  image_name      - Output the image name (use with make -s)'
1315         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1316          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1317          echo  ''
1318         @echo  'Static analysers'
1319         @echo  '  checkstack      - Generate a list of stack hogs'
1320         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1321         @echo  '  versioncheck    - Sanity check on version.h usage'
1322         @echo  '  includecheck    - Check for duplicate included header files'
1323         @echo  '  export_report   - List the usages of all exported symbols'
1324         @echo  '  headers_check   - Sanity check on exported headers'
1325         @echo  '  headerdep       - Detect inclusion cycles in headers'
1326         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1327         @echo  ''
1328         @echo  'Kernel selftest'
1329         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1330         @echo  '                    Build, install, and boot kernel before'
1331         @echo  '                    running kselftest on it'
1332         @echo  '  kselftest-clean - Remove all generated kselftest files'
1333         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existed'
1334         @echo  '                    .config.'
1335         @echo  ''
1336         @echo  'Kernel packaging:'
1337         @$(MAKE) $(build)=$(package-dir) help
1338         @echo  ''
1339         @echo  'Documentation targets:'
1340         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1341         @echo  ''
1342         @echo  'Architecture specific targets ($(SRCARCH)):'
1343         @$(if $(archhelp),$(archhelp),\
1344                 echo '  No architecture specific help defined for $(SRCARCH)')
1345         @echo  ''
1346         @$(if $(boards), \
1347                 $(foreach b, $(boards), \
1348                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1349                 echo '')
1350         @$(if $(board-dirs), \
1351                 $(foreach b, $(board-dirs), \
1352                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1353                 printf "  %-16s - Show all of the above\\n" help-boards; \
1354                 echo '')
1355 
1356         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1357         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1358         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1359         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1360         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1361         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1362         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1363         @echo  '                1: warnings which may be relevant and do not occur too often'
1364         @echo  '                2: warnings which occur quite often but may still be relevant'
1365         @echo  '                3: more obscure warnings, can most likely be ignored'
1366         @echo  '                Multiple levels can be combined with W=12 or W=123'
1367         @echo  ''
1368         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1369         @echo  'For further info see the ./README file'
1370 
1371 
1372 help-board-dirs := $(addprefix help-,$(board-dirs))
1373 
1374 help-boards: $(help-board-dirs)
1375 
1376 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1377 
1378 $(help-board-dirs): help-%:
1379         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1380         @$(if $(boards-per-dir), \
1381                 $(foreach b, $(boards-per-dir), \
1382                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1383                 echo '')
1384 
1385 
1386 # Documentation targets
1387 # ---------------------------------------------------------------------------
1388 %docs: scripts_basic FORCE
1389         $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1390         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1391 
1392 else # KBUILD_EXTMOD
1393 
1394 ###
1395 # External module support.
1396 # When building external modules the kernel used as basis is considered
1397 # read-only, and no consistency checks are made and the make
1398 # system is not used on the basis kernel. If updates are required
1399 # in the basis kernel ordinary make commands (without M=...) must
1400 # be used.
1401 #
1402 # The following are the only valid targets when building external
1403 # modules.
1404 # make M=dir clean     Delete all automatically generated files
1405 # make M=dir modules   Make all modules in specified dir
1406 # make M=dir           Same as 'make M=dir modules'
1407 # make M=dir modules_install
1408 #                      Install the modules built in the module directory
1409 #                      Assumes install directory is already created
1410 
1411 # We are always building modules
1412 KBUILD_MODULES := 1
1413 PHONY += crmodverdir
1414 crmodverdir:
1415         $(cmd_crmodverdir)
1416 
1417 PHONY += $(objtree)/Module.symvers
1418 $(objtree)/Module.symvers:
1419         @test -e $(objtree)/Module.symvers || ( \
1420         echo; \
1421         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1422         echo "           is missing; modules will have no dependencies and modversions."; \
1423         echo )
1424 
1425 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1426 PHONY += $(module-dirs) modules
1427 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1428         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1429 
1430 modules: $(module-dirs)
1431         @$(kecho) '  Building modules, stage 2.';
1432         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1433 
1434 PHONY += modules_install
1435 modules_install: _emodinst_ _emodinst_post
1436 
1437 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1438 PHONY += _emodinst_
1439 _emodinst_:
1440         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1441         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1442 
1443 PHONY += _emodinst_post
1444 _emodinst_post: _emodinst_
1445         $(call cmd,depmod)
1446 
1447 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1448 
1449 PHONY += $(clean-dirs) clean
1450 $(clean-dirs):
1451         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1452 
1453 clean:  rm-dirs := $(MODVERDIR)
1454 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1455 
1456 help:
1457         @echo  '  Building external modules.'
1458         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1459         @echo  ''
1460         @echo  '  modules         - default target, build the module(s)'
1461         @echo  '  modules_install - install the module'
1462         @echo  '  clean           - remove generated files in module directory only'
1463         @echo  ''
1464 
1465 # Dummies...
1466 PHONY += prepare scripts
1467 prepare: ;
1468 scripts: ;
1469 endif # KBUILD_EXTMOD
1470 
1471 clean: $(clean-dirs)
1472         $(call cmd,rmdirs)
1473         $(call cmd,rmfiles)
1474         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1475                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1476                 -o -name '*.ko.*' \
1477                 -o -name '*.dwo'  \
1478                 -o -name '*.su'  \
1479                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1480                 -o -name '*.symtypes' -o -name 'modules.order' \
1481                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1482                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1483 
1484 # Generate tags for editors
1485 # ---------------------------------------------------------------------------
1486 quiet_cmd_tags = GEN     $@
1487       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1488 
1489 tags TAGS cscope gtags: FORCE
1490         $(call cmd,tags)
1491 
1492 # Scripts to check various things for consistency
1493 # ---------------------------------------------------------------------------
1494 
1495 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1496 
1497 includecheck:
1498         find $(srctree)/* $(RCS_FIND_IGNORE) \
1499                 -name '*.[hcS]' -type f -print | sort \
1500                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1501 
1502 versioncheck:
1503         find $(srctree)/* $(RCS_FIND_IGNORE) \
1504                 -name '*.[hcS]' -type f -print | sort \
1505                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1506 
1507 coccicheck:
1508         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1509 
1510 namespacecheck:
1511         $(PERL) $(srctree)/scripts/namespace.pl
1512 
1513 export_report:
1514         $(PERL) $(srctree)/scripts/export_report.pl
1515 
1516 endif #ifeq ($(config-targets),1)
1517 endif #ifeq ($(mixed-targets),1)
1518 
1519 PHONY += checkstack kernelrelease kernelversion image_name
1520 
1521 # UML needs a little special treatment here.  It wants to use the host
1522 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1523 # else wants $(ARCH), including people doing cross-builds, which means
1524 # that $(SUBARCH) doesn't work here.
1525 ifeq ($(ARCH), um)
1526 CHECKSTACK_ARCH := $(SUBARCH)
1527 else
1528 CHECKSTACK_ARCH := $(ARCH)
1529 endif
1530 checkstack:
1531         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1532         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1533 
1534 kernelrelease:
1535         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1536 
1537 kernelversion:
1538         @echo $(KERNELVERSION)
1539 
1540 image_name:
1541         @echo $(KBUILD_IMAGE)
1542 
1543 # Clear a bunch of variables before executing the submake
1544 tools/: FORCE
1545         $(Q)mkdir -p $(objtree)/tools
1546         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1547 
1548 tools/%: FORCE
1549         $(Q)mkdir -p $(objtree)/tools
1550         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1551 
1552 # Single targets
1553 # ---------------------------------------------------------------------------
1554 # Single targets are compatible with:
1555 # - build with mixed source and output
1556 # - build with separate output dir 'make O=...'
1557 # - external modules
1558 #
1559 #  target-dir => where to store outputfile
1560 #  build-dir  => directory in kernel source tree to use
1561 
1562 ifeq ($(KBUILD_EXTMOD),)
1563         build-dir  = $(patsubst %/,%,$(dir $@))
1564         target-dir = $(dir $@)
1565 else
1566         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1567         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1568         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1569 endif
1570 
1571 %.s: %.c prepare scripts FORCE
1572         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1573 %.i: %.c prepare scripts FORCE
1574         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1575 %.o: %.c prepare scripts FORCE
1576         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1577 %.lst: %.c prepare scripts FORCE
1578         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1579 %.s: %.S prepare scripts FORCE
1580         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1581 %.o: %.S prepare scripts FORCE
1582         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1583 %.symtypes: %.c prepare scripts FORCE
1584         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1585 
1586 # Modules
1587 /: prepare scripts FORCE
1588         $(cmd_crmodverdir)
1589         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1590         $(build)=$(build-dir)
1591 # Make sure the latest headers are built for Documentation
1592 Documentation/: headers_install
1593 %/: prepare scripts FORCE
1594         $(cmd_crmodverdir)
1595         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1596         $(build)=$(build-dir)
1597 %.ko: prepare scripts FORCE
1598         $(cmd_crmodverdir)
1599         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1600         $(build)=$(build-dir) $(@:.ko=.o)
1601         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1602 
1603 # FIXME Should go into a make.lib or something
1604 # ===========================================================================
1605 
1606 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1607       cmd_rmdirs = rm -rf $(rm-dirs)
1608 
1609 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1610       cmd_rmfiles = rm -f $(rm-files)
1611 
1612 # Run depmod only if we have System.map and depmod is executable
1613 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1614       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1615                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1616 
1617 # Create temporary dir for module support files
1618 # clean it up only when building all modules
1619 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1620                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1621 
1622 # read all saved command lines
1623 
1624 targets := $(wildcard $(sort $(targets)))
1625 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1626 
1627 ifneq ($(cmd_files),)
1628   $(cmd_files): ;       # Do not try to update included dependency files
1629   include $(cmd_files)
1630 endif
1631 
1632 endif   # skip-makefile
1633 
1634 PHONY += FORCE
1635 FORCE:
1636 
1637 # Declare the contents of the .PHONY variable as phony.  We keep that
1638 # information in a variable so we can use it in if_changed and friends.
1639 .PHONY: $(PHONY)

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