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

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