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 = 13
  3 SUBLEVEL = 0
  4 EXTRAVERSION =
  5 NAME = One Giant Leap for Frogkind
  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 # To put more focus on warnings, be less verbose as default
 45 # Use 'make V=1' to see the full commands
 46 
 47 ifeq ("$(origin V)", "command line")
 48   KBUILD_VERBOSE = $(V)
 49 endif
 50 ifndef KBUILD_VERBOSE
 51   KBUILD_VERBOSE = 0
 52 endif
 53 
 54 # Call a source code checker (by default, "sparse") as part of the
 55 # C compilation.
 56 #
 57 # Use 'make C=1' to enable checking of only re-compiled files.
 58 # Use 'make C=2' to enable checking of *all* source files, regardless
 59 # of whether they are re-compiled or not.
 60 #
 61 # See the file "Documentation/sparse.txt" for more details, including
 62 # where to get the "sparse" utility.
 63 
 64 ifeq ("$(origin C)", "command line")
 65   KBUILD_CHECKSRC = $(C)
 66 endif
 67 ifndef KBUILD_CHECKSRC
 68   KBUILD_CHECKSRC = 0
 69 endif
 70 
 71 # Use make M=dir to specify directory of external module to build
 72 # Old syntax make ... SUBDIRS=$PWD is still supported
 73 # Setting the environment variable KBUILD_EXTMOD take precedence
 74 ifdef SUBDIRS
 75   KBUILD_EXTMOD ?= $(SUBDIRS)
 76 endif
 77 
 78 ifeq ("$(origin M)", "command line")
 79   KBUILD_EXTMOD := $(M)
 80 endif
 81 
 82 # kbuild supports saving output files in a separate directory.
 83 # To locate output files in a separate directory two syntaxes are supported.
 84 # In both cases the working directory must be the root of the kernel src.
 85 # 1) O=
 86 # Use "make O=dir/to/store/output/files/"
 87 #
 88 # 2) Set KBUILD_OUTPUT
 89 # Set the environment variable KBUILD_OUTPUT to point to the directory
 90 # where the output files shall be placed.
 91 # export KBUILD_OUTPUT=dir/to/store/output/files/
 92 # make
 93 #
 94 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 95 # variable.
 96 
 97 
 98 # KBUILD_SRC is set on invocation of make in OBJ directory
 99 # KBUILD_SRC is not intended to be used by the regular user (for now)
100 ifeq ($(KBUILD_SRC),)
101 
102 # OK, Make called in directory where kernel src resides
103 # Do we want to locate output files in a separate directory?
104 ifeq ("$(origin O)", "command line")
105   KBUILD_OUTPUT := $(O)
106 endif
107 
108 ifeq ("$(origin W)", "command line")
109   export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
110 endif
111 
112 # That's our default target when none is given on the command line
113 PHONY := _all
114 _all:
115 
116 # Cancel implicit rules on top Makefile
117 $(CURDIR)/Makefile Makefile: ;
118 
119 ifneq ($(KBUILD_OUTPUT),)
120 # Invoke a second make in the output directory, passing relevant variables
121 # check that the output directory actually exists
122 saved-output := $(KBUILD_OUTPUT)
123 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
124 $(if $(KBUILD_OUTPUT),, \
125      $(error output directory "$(saved-output)" does not exist))
126 
127 PHONY += $(MAKECMDGOALS) sub-make
128 
129 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
130         @:
131 
132 sub-make: FORCE
133         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
134         KBUILD_SRC=$(CURDIR) \
135         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
136         $(filter-out _all sub-make,$(MAKECMDGOALS))
137 
138 # Leave processing to above invocation of make
139 skip-makefile := 1
140 endif # ifneq ($(KBUILD_OUTPUT),)
141 endif # ifeq ($(KBUILD_SRC),)
142 
143 # We process the rest of the Makefile if this is the final invocation of make
144 ifeq ($(skip-makefile),)
145 
146 # If building an external module we do not care about the all: rule
147 # but instead _all depend on modules
148 PHONY += all
149 ifeq ($(KBUILD_EXTMOD),)
150 _all: all
151 else
152 _all: modules
153 endif
154 
155 srctree         := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
156 objtree         := $(CURDIR)
157 src             := $(srctree)
158 obj             := $(objtree)
159 
160 VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
161 
162 export srctree objtree VPATH
163 
164 
165 # SUBARCH tells the usermode build what the underlying arch is.  That is set
166 # first, and if a usermode build is happening, the "ARCH=um" on the command
167 # line overrides the setting of ARCH below.  If a native build is happening,
168 # then ARCH is assigned, getting whatever value it gets normally, and 
169 # SUBARCH is subsequently ignored.
170 
171 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
172                                   -e s/sun4u/sparc64/ \
173                                   -e s/arm.*/arm/ -e s/sa110/arm/ \
174                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
175                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
176                                   -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
177 
178 # Cross compiling and selecting different set of gcc/bin-utils
179 # ---------------------------------------------------------------------------
180 #
181 # When performing cross compilation for other architectures ARCH shall be set
182 # to the target architecture. (See arch/* for the possibilities).
183 # ARCH can be set during invocation of make:
184 # make ARCH=ia64
185 # Another way is to have ARCH set in the environment.
186 # The default ARCH is the host where make is executed.
187 
188 # CROSS_COMPILE specify the prefix used for all executables used
189 # during compilation. Only gcc and related bin-utils executables
190 # are prefixed with $(CROSS_COMPILE).
191 # CROSS_COMPILE can be set on the command line
192 # make CROSS_COMPILE=ia64-linux-
193 # Alternatively CROSS_COMPILE can be set in the environment.
194 # A third alternative is to store a setting in .config so that plain
195 # "make" in the configured kernel build directory always uses that.
196 # Default value for CROSS_COMPILE is not to prefix executables
197 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
198 ARCH            ?= $(SUBARCH)
199 CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
200 
201 # Architecture as present in compile.h
202 UTS_MACHINE     := $(ARCH)
203 SRCARCH         := $(ARCH)
204 
205 # Additional ARCH settings for x86
206 ifeq ($(ARCH),i386)
207         SRCARCH := x86
208 endif
209 ifeq ($(ARCH),x86_64)
210         SRCARCH := x86
211 endif
212 
213 # Additional ARCH settings for sparc
214 ifeq ($(ARCH),sparc32)
215        SRCARCH := sparc
216 endif
217 ifeq ($(ARCH),sparc64)
218        SRCARCH := sparc
219 endif
220 
221 # Additional ARCH settings for sh
222 ifeq ($(ARCH),sh64)
223        SRCARCH := sh
224 endif
225 
226 # Additional ARCH settings for tile
227 ifeq ($(ARCH),tilepro)
228        SRCARCH := tile
229 endif
230 ifeq ($(ARCH),tilegx)
231        SRCARCH := tile
232 endif
233 
234 # Where to locate arch specific headers
235 hdr-arch  := $(SRCARCH)
236 
237 KCONFIG_CONFIG  ?= .config
238 export KCONFIG_CONFIG
239 
240 # SHELL used by kbuild
241 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
242           else if [ -x /bin/bash ]; then echo /bin/bash; \
243           else echo sh; fi ; fi)
244 
245 HOSTCC       = gcc
246 HOSTCXX      = g++
247 HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
248 HOSTCXXFLAGS = -O2
249 
250 # Decide whether to build built-in, modular, or both.
251 # Normally, just do built-in.
252 
253 KBUILD_MODULES :=
254 KBUILD_BUILTIN := 1
255 
256 #       If we have only "make modules", don't compile built-in objects.
257 #       When we're building modules with modversions, we need to consider
258 #       the built-in objects during the descend as well, in order to
259 #       make sure the checksums are up to date before we record them.
260 
261 ifeq ($(MAKECMDGOALS),modules)
262   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
263 endif
264 
265 #       If we have "make <whatever> modules", compile modules
266 #       in addition to whatever we do anyway.
267 #       Just "make" or "make all" shall build modules as well
268 
269 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
270   KBUILD_MODULES := 1
271 endif
272 
273 ifeq ($(MAKECMDGOALS),)
274   KBUILD_MODULES := 1
275 endif
276 
277 export KBUILD_MODULES KBUILD_BUILTIN
278 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
279 
280 # Beautify output
281 # ---------------------------------------------------------------------------
282 #
283 # Normally, we echo the whole command before executing it. By making
284 # that echo $($(quiet)$(cmd)), we now have the possibility to set
285 # $(quiet) to choose other forms of output instead, e.g.
286 #
287 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
288 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
289 #
290 # If $(quiet) is empty, the whole command will be printed.
291 # If it is set to "quiet_", only the short version will be printed. 
292 # If it is set to "silent_", nothing will be printed at all, since
293 # the variable $(silent_cmd_cc_o_c) doesn't exist.
294 #
295 # A simple variant is to prefix commands with $(Q) - that's useful
296 # for commands that shall be hidden in non-verbose mode.
297 #
298 #       $(Q)ln $@ :<
299 #
300 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
301 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
302 
303 ifeq ($(KBUILD_VERBOSE),1)
304   quiet =
305   Q =
306 else
307   quiet=quiet_
308   Q = @
309 endif
310 
311 # If the user is running make -s (silent mode), suppress echoing of
312 # commands
313 
314 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
315   quiet=silent_
316 endif
317 
318 export quiet Q KBUILD_VERBOSE
319 
320 
321 # Look for make include files relative to root of kernel src
322 MAKEFLAGS += --include-dir=$(srctree)
323 
324 # We need some generic definitions (do not try to remake the file).
325 $(srctree)/scripts/Kbuild.include: ;
326 include $(srctree)/scripts/Kbuild.include
327 
328 # Make variables (CC, etc...)
329 
330 AS              = $(CROSS_COMPILE)as
331 LD              = $(CROSS_COMPILE)ld
332 CC              = $(CROSS_COMPILE)gcc
333 CPP             = $(CC) -E
334 AR              = $(CROSS_COMPILE)ar
335 NM              = $(CROSS_COMPILE)nm
336 STRIP           = $(CROSS_COMPILE)strip
337 OBJCOPY         = $(CROSS_COMPILE)objcopy
338 OBJDUMP         = $(CROSS_COMPILE)objdump
339 AWK             = awk
340 GENKSYMS        = scripts/genksyms/genksyms
341 INSTALLKERNEL  := installkernel
342 DEPMOD          = /sbin/depmod
343 PERL            = perl
344 CHECK           = sparse
345 
346 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
347                   -Wbitwise -Wno-return-void $(CF)
348 CFLAGS_MODULE   =
349 AFLAGS_MODULE   =
350 LDFLAGS_MODULE  =
351 CFLAGS_KERNEL   =
352 AFLAGS_KERNEL   =
353 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
354 
355 
356 # Use USERINCLUDE when you must reference the UAPI directories only.
357 USERINCLUDE    := \
358                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
359                 -Iarch/$(hdr-arch)/include/generated/uapi \
360                 -I$(srctree)/include/uapi \
361                 -Iinclude/generated/uapi \
362                 -include $(srctree)/include/linux/kconfig.h
363 
364 # Use LINUXINCLUDE when you must reference the include/ directory.
365 # Needed to be compatible with the O= option
366 LINUXINCLUDE    := \
367                 -I$(srctree)/arch/$(hdr-arch)/include \
368                 -Iarch/$(hdr-arch)/include/generated \
369                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
370                 -Iinclude \
371                 $(USERINCLUDE)
372 
373 KBUILD_CPPFLAGS := -D__KERNEL__
374 
375 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
376                    -fno-strict-aliasing -fno-common \
377                    -Werror-implicit-function-declaration \
378                    -Wno-format-security \
379                    -fno-delete-null-pointer-checks
380 KBUILD_AFLAGS_KERNEL :=
381 KBUILD_CFLAGS_KERNEL :=
382 KBUILD_AFLAGS   := -D__ASSEMBLY__
383 KBUILD_AFLAGS_MODULE  := -DMODULE
384 KBUILD_CFLAGS_MODULE  := -DMODULE
385 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
386 
387 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
388 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
389 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
390 
391 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
392 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
393 export CPP AR NM STRIP OBJCOPY OBJDUMP
394 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
395 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
396 
397 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
398 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
399 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
400 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
401 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
402 export KBUILD_ARFLAGS
403 
404 # When compiling out-of-tree modules, put MODVERDIR in the module
405 # tree rather than in the kernel tree. The kernel tree might
406 # even be read-only.
407 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
408 
409 # Files to ignore in find ... statements
410 
411 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \
412                    -o -name .pc -o -name .hg -o -name .git \) -prune -o
413 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
414                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
415 
416 # ===========================================================================
417 # Rules shared between *config targets and build targets
418 
419 # Basic helpers built in scripts/
420 PHONY += scripts_basic
421 scripts_basic:
422         $(Q)$(MAKE) $(build)=scripts/basic
423         $(Q)rm -f .tmp_quiet_recordmcount
424 
425 # To avoid any implicit rule to kick in, define an empty command.
426 scripts/basic/%: scripts_basic ;
427 
428 PHONY += outputmakefile
429 # outputmakefile generates a Makefile in the output directory, if using a
430 # separate output directory. This allows convenient use of make in the
431 # output directory.
432 outputmakefile:
433 ifneq ($(KBUILD_SRC),)
434         $(Q)ln -fsn $(srctree) source
435         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
436             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
437 endif
438 
439 # Support for using generic headers in asm-generic
440 PHONY += asm-generic
441 asm-generic:
442         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
443                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
444         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
445                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
446 
447 # To make sure we do not include .config for any of the *config targets
448 # catch them early, and hand them over to scripts/kconfig/Makefile
449 # It is allowed to specify more targets when calling make, including
450 # mixing *config targets and build targets.
451 # For example 'make oldconfig all'.
452 # Detect when mixed targets is specified, and make a second invocation
453 # of make so .config is not included in this case either (for *config).
454 
455 version_h := include/generated/uapi/linux/version.h
456 
457 no-dot-config-targets := clean mrproper distclean \
458                          cscope gtags TAGS tags help %docs check% coccicheck \
459                          $(version_h) headers_% archheaders archscripts \
460                          kernelversion %src-pkg
461 
462 config-targets := 0
463 mixed-targets  := 0
464 dot-config     := 1
465 
466 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
467         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
468                 dot-config := 0
469         endif
470 endif
471 
472 ifeq ($(KBUILD_EXTMOD),)
473         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
474                 config-targets := 1
475                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
476                         mixed-targets := 1
477                 endif
478         endif
479 endif
480 
481 ifeq ($(mixed-targets),1)
482 # ===========================================================================
483 # We're called with mixed targets (*config and build targets).
484 # Handle them one by one.
485 
486 %:: FORCE
487         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
488 
489 else
490 ifeq ($(config-targets),1)
491 # ===========================================================================
492 # *config targets only - make sure prerequisites are updated, and descend
493 # in scripts/kconfig to make the *config target
494 
495 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
496 # KBUILD_DEFCONFIG may point out an alternative default configuration
497 # used for 'make defconfig'
498 include $(srctree)/arch/$(SRCARCH)/Makefile
499 export KBUILD_DEFCONFIG KBUILD_KCONFIG
500 
501 config: scripts_basic outputmakefile FORCE
502         $(Q)mkdir -p include/linux include/config
503         $(Q)$(MAKE) $(build)=scripts/kconfig $@
504 
505 %config: scripts_basic outputmakefile FORCE
506         $(Q)mkdir -p include/linux include/config
507         $(Q)$(MAKE) $(build)=scripts/kconfig $@
508 
509 else
510 # ===========================================================================
511 # Build targets only - this includes vmlinux, arch specific targets, clean
512 # targets and others. In general all targets except *config targets.
513 
514 ifeq ($(KBUILD_EXTMOD),)
515 # Additional helpers built in scripts/
516 # Carefully list dependencies so we do not try to build scripts twice
517 # in parallel
518 PHONY += scripts
519 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
520          asm-generic
521         $(Q)$(MAKE) $(build)=$(@)
522 
523 # Objects we will link into vmlinux / subdirs we need to visit
524 init-y          := init/
525 drivers-y       := drivers/ sound/ firmware/
526 net-y           := net/
527 libs-y          := lib/
528 core-y          := usr/
529 endif # KBUILD_EXTMOD
530 
531 ifeq ($(dot-config),1)
532 # Read in config
533 -include include/config/auto.conf
534 
535 ifeq ($(KBUILD_EXTMOD),)
536 # Read in dependencies to all Kconfig* files, make sure to run
537 # oldconfig if changes are detected.
538 -include include/config/auto.conf.cmd
539 
540 # To avoid any implicit rule to kick in, define an empty command
541 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
542 
543 # If .config is newer than include/config/auto.conf, someone tinkered
544 # with it and forgot to run make oldconfig.
545 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
546 # we execute the config step to be sure to catch updated Kconfig files
547 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
548         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
549 else
550 # external modules needs include/generated/autoconf.h and include/config/auto.conf
551 # but do not care if they are up-to-date. Use auto.conf to trigger the test
552 PHONY += include/config/auto.conf
553 
554 include/config/auto.conf:
555         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
556         echo >&2;                                                       \
557         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
558         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
559         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
560         echo >&2 ;                                                      \
561         /bin/false)
562 
563 endif # KBUILD_EXTMOD
564 
565 else
566 # Dummy target needed, because used as prerequisite
567 include/config/auto.conf: ;
568 endif # $(dot-config)
569 
570 # The all: target is the default when no target is given on the
571 # command line.
572 # This allow a user to issue only 'make' to build a kernel including modules
573 # Defaults to vmlinux, but the arch makefile usually adds further targets
574 all: vmlinux
575 
576 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
577 KBUILD_CFLAGS   += -Os $(call cc-disable-warning,maybe-uninitialized,)
578 else
579 KBUILD_CFLAGS   += -O2
580 endif
581 
582 include $(srctree)/arch/$(SRCARCH)/Makefile
583 
584 ifdef CONFIG_READABLE_ASM
585 # Disable optimizations that make assembler listings hard to read.
586 # reorder blocks reorders the control in the function
587 # ipa clone creates specialized cloned functions
588 # partial inlining inlines only parts of functions
589 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
590                  $(call cc-option,-fno-ipa-cp-clone,) \
591                  $(call cc-option,-fno-partial-inlining)
592 endif
593 
594 ifneq ($(CONFIG_FRAME_WARN),0)
595 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
596 endif
597 
598 # Force gcc to behave correct even for buggy distributions
599 ifndef CONFIG_CC_STACKPROTECTOR
600 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
601 endif
602 
603 # This warning generated too much noise in a regular build.
604 # Use make W=1 to enable this warning (see scripts/Makefile.build)
605 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
606 
607 ifdef CONFIG_FRAME_POINTER
608 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
609 else
610 # Some targets (ARM with Thumb2, for example), can't be built with frame
611 # pointers.  For those, we don't have FUNCTION_TRACER automatically
612 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
613 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
614 # -fomit-frame-pointer with FUNCTION_TRACER.
615 ifndef CONFIG_FUNCTION_TRACER
616 KBUILD_CFLAGS   += -fomit-frame-pointer
617 endif
618 endif
619 
620 ifdef CONFIG_DEBUG_INFO
621 KBUILD_CFLAGS   += -g
622 KBUILD_AFLAGS   += -gdwarf-2
623 endif
624 
625 ifdef CONFIG_DEBUG_INFO_REDUCED
626 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
627                    $(call cc-option,-fno-var-tracking)
628 endif
629 
630 ifdef CONFIG_FUNCTION_TRACER
631 ifdef CONFIG_HAVE_FENTRY
632 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
633 endif
634 KBUILD_CFLAGS   += -pg $(CC_USING_FENTRY)
635 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
636 ifdef CONFIG_DYNAMIC_FTRACE
637         ifdef CONFIG_HAVE_C_RECORDMCOUNT
638                 BUILD_C_RECORDMCOUNT := y
639                 export BUILD_C_RECORDMCOUNT
640         endif
641 endif
642 endif
643 
644 # We trigger additional mismatches with less inlining
645 ifdef CONFIG_DEBUG_SECTION_MISMATCH
646 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
647 endif
648 
649 # arch Makefile may override CC so keep this after arch Makefile is included
650 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
651 CHECKFLAGS     += $(NOSTDINC_FLAGS)
652 
653 # warn about C99 declaration after statement
654 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
655 
656 # disable pointer signed / unsigned warnings in gcc 4.0
657 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
658 
659 # disable invalid "can't wrap" optimizations for signed / pointers
660 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
661 
662 # conserve stack if available
663 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
664 
665 # disallow errors like 'EXPORT_GPL(foo);' with missing header
666 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
667 
668 # require functions to have arguments in prototypes, not empty 'int foo()'
669 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
670 
671 # use the deterministic mode of AR if available
672 KBUILD_ARFLAGS := $(call ar-option,D)
673 
674 # check for 'asm goto'
675 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
676         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
677 endif
678 
679 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
680 KBUILD_CPPFLAGS += $(KCPPFLAGS)
681 KBUILD_AFLAGS += $(KAFLAGS)
682 KBUILD_CFLAGS += $(KCFLAGS)
683 
684 # Use --build-id when available.
685 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
686                               $(call cc-ldoption, -Wl$(comma)--build-id,))
687 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
688 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
689 
690 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
691 LDFLAGS_vmlinux += $(call ld-option, -X,)
692 endif
693 
694 # Default kernel image to build when no specific target is given.
695 # KBUILD_IMAGE may be overruled on the command line or
696 # set in the environment
697 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
698 # this default value
699 export KBUILD_IMAGE ?= vmlinux
700 
701 #
702 # INSTALL_PATH specifies where to place the updated kernel and system map
703 # images. Default is /boot, but you can set it to other values
704 export  INSTALL_PATH ?= /boot
705 
706 #
707 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
708 # relocations required by build roots.  This is not defined in the
709 # makefile but the argument can be passed to make if needed.
710 #
711 
712 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
713 export MODLIB
714 
715 #
716 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
717 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
718 #  the default option --strip-debug will be used.  Otherwise,
719 #  INSTALL_MOD_STRIP value will be used as the options to the strip command.
720 
721 ifdef INSTALL_MOD_STRIP
722 ifeq ($(INSTALL_MOD_STRIP),1)
723 mod_strip_cmd = $(STRIP) --strip-debug
724 else
725 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
726 endif # INSTALL_MOD_STRIP=1
727 else
728 mod_strip_cmd = true
729 endif # INSTALL_MOD_STRIP
730 export mod_strip_cmd
731 
732 # Select initial ramdisk compression format, default is gzip(1).
733 # This shall be used by the dracut(8) tool while creating an initramfs image.
734 #
735 INITRD_COMPRESS-y                  := gzip
736 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
737 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
738 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
739 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
740 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
741 # do not export INITRD_COMPRESS, since we didn't actually
742 # choose a sane default compression above.
743 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
744 
745 ifdef CONFIG_MODULE_SIG_ALL
746 MODSECKEY = ./signing_key.priv
747 MODPUBKEY = ./signing_key.x509
748 export MODPUBKEY
749 mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
750 else
751 mod_sign_cmd = true
752 endif
753 export mod_sign_cmd
754 
755 
756 ifeq ($(KBUILD_EXTMOD),)
757 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
758 
759 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
760                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
761                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
762 
763 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
764                      $(init-n) $(init-) \
765                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
766                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
767 
768 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
769 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
770 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
771 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
772 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
773 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
774 libs-y          := $(libs-y1) $(libs-y2)
775 
776 # Externally visible symbols (used by link-vmlinux.sh)
777 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
778 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
779 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
780 export LDFLAGS_vmlinux
781 # used by scripts/pacmage/Makefile
782 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
783 
784 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
785 
786 # Final link of vmlinux
787       cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
788 quiet_cmd_link-vmlinux = LINK    $@
789 
790 # Include targets which we want to
791 # execute if the rest of the kernel build went well.
792 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
793 ifdef CONFIG_HEADERS_CHECK
794         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
795 endif
796 ifdef CONFIG_SAMPLES
797         $(Q)$(MAKE) $(build)=samples
798 endif
799 ifdef CONFIG_BUILD_DOCSRC
800         $(Q)$(MAKE) $(build)=Documentation
801 endif
802         +$(call if_changed,link-vmlinux)
803 
804 # The actual objects are generated when descending, 
805 # make sure no implicit rule kicks in
806 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
807 
808 # Handle descending into subdirectories listed in $(vmlinux-dirs)
809 # Preset locale variables to speed up the build process. Limit locale
810 # tweaks to this spot to avoid wrong language settings when running
811 # make menuconfig etc.
812 # Error messages still appears in the original language
813 
814 PHONY += $(vmlinux-dirs)
815 $(vmlinux-dirs): prepare scripts
816         $(Q)$(MAKE) $(build)=$@
817 
818 define filechk_kernel.release
819         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
820 endef
821 
822 # Store (new) KERNELRELEASE string in include/config/kernel.release
823 include/config/kernel.release: include/config/auto.conf FORCE
824         $(call filechk,kernel.release)
825 
826 
827 # Things we need to do before we recursively start building the kernel
828 # or the modules are listed in "prepare".
829 # A multi level approach is used. prepareN is processed before prepareN-1.
830 # archprepare is used in arch Makefiles and when processed asm symlink,
831 # version.h and scripts_basic is processed / created.
832 
833 # Listed in dependency order
834 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
835 
836 # prepare3 is used to check if we are building in a separate output directory,
837 # and if so do:
838 # 1) Check that make has not been executed in the kernel src $(srctree)
839 prepare3: include/config/kernel.release
840 ifneq ($(KBUILD_SRC),)
841         @$(kecho) '  Using $(srctree) as source for kernel'
842         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
843                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
844                 echo >&2 "  in the '$(srctree)' directory.";\
845                 /bin/false; \
846         fi;
847 endif
848 
849 # prepare2 creates a makefile if using a separate output directory
850 prepare2: prepare3 outputmakefile asm-generic
851 
852 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
853                    include/config/auto.conf
854         $(cmd_crmodverdir)
855 
856 archprepare: archheaders archscripts prepare1 scripts_basic
857 
858 prepare0: archprepare FORCE
859         $(Q)$(MAKE) $(build)=.
860 
861 # All the preparing..
862 prepare: prepare0
863 
864 # Generate some files
865 # ---------------------------------------------------------------------------
866 
867 # KERNELRELEASE can change from a few different places, meaning version.h
868 # needs to be updated, so this check is forced on all builds
869 
870 uts_len := 64
871 define filechk_utsrelease.h
872         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
873           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
874           exit 1;                                                         \
875         fi;                                                               \
876         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
877 endef
878 
879 define filechk_version.h
880         (echo \#define LINUX_VERSION_CODE $(shell                         \
881         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
882         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
883 endef
884 
885 $(version_h): $(srctree)/Makefile FORCE
886         $(call filechk,version.h)
887 
888 include/generated/utsrelease.h: include/config/kernel.release FORCE
889         $(call filechk,utsrelease.h)
890 
891 PHONY += headerdep
892 headerdep:
893         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
894         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
895 
896 # ---------------------------------------------------------------------------
897 
898 PHONY += depend dep
899 depend dep:
900         @echo '*** Warning: make $@ is unnecessary now.'
901 
902 # ---------------------------------------------------------------------------
903 # Firmware install
904 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
905 export INSTALL_FW_PATH
906 
907 PHONY += firmware_install
908 firmware_install: FORCE
909         @mkdir -p $(objtree)/firmware
910         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
911 
912 # ---------------------------------------------------------------------------
913 # Kernel headers
914 
915 #Default location for installed headers
916 export INSTALL_HDR_PATH = $(objtree)/usr
917 
918 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
919 
920 # If we do an all arch process set dst to asm-$(hdr-arch)
921 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
922 
923 PHONY += archheaders
924 archheaders:
925 
926 PHONY += archscripts
927 archscripts:
928 
929 PHONY += __headers
930 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
931         $(Q)$(MAKE) $(build)=scripts build_unifdef
932 
933 PHONY += headers_install_all
934 headers_install_all:
935         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
936 
937 PHONY += headers_install
938 headers_install: __headers
939         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
940           $(error Headers not exportable for the $(SRCARCH) architecture))
941         $(Q)$(MAKE) $(hdr-inst)=include/uapi
942         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
943 
944 PHONY += headers_check_all
945 headers_check_all: headers_install_all
946         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
947 
948 PHONY += headers_check
949 headers_check: headers_install
950         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
951         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
952 
953 # ---------------------------------------------------------------------------
954 # Modules
955 
956 ifdef CONFIG_MODULES
957 
958 # By default, build modules as well
959 
960 all: modules
961 
962 #       Build modules
963 #
964 #       A module can be listed more than once in obj-m resulting in
965 #       duplicate lines in modules.order files.  Those are removed
966 #       using awk while concatenating to the final file.
967 
968 PHONY += modules
969 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
970         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
971         @$(kecho) '  Building modules, stage 2.';
972         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
973         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
974 
975 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
976         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
977 
978 %/modules.builtin: include/config/auto.conf
979         $(Q)$(MAKE) $(modbuiltin)=$*
980 
981 
982 # Target to prepare building external modules
983 PHONY += modules_prepare
984 modules_prepare: prepare scripts
985 
986 # Target to install modules
987 PHONY += modules_install
988 modules_install: _modinst_ _modinst_post
989 
990 PHONY += _modinst_
991 _modinst_:
992         @rm -rf $(MODLIB)/kernel
993         @rm -f $(MODLIB)/source
994         @mkdir -p $(MODLIB)/kernel
995         @ln -s $(srctree) $(MODLIB)/source
996         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
997                 rm -f $(MODLIB)/build ; \
998                 ln -s $(objtree) $(MODLIB)/build ; \
999         fi
1000         @cp -f $(objtree)/modules.order $(MODLIB)/
1001         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1002         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1003 
1004 # This depmod is only for convenience to give the initial
1005 # boot a modules.dep even before / is mounted read-write.  However the
1006 # boot script depmod is the master version.
1007 PHONY += _modinst_post
1008 _modinst_post: _modinst_
1009         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1010         $(call cmd,depmod)
1011 
1012 ifeq ($(CONFIG_MODULE_SIG), y)
1013 PHONY += modules_sign
1014 modules_sign:
1015         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1016 endif
1017 
1018 else # CONFIG_MODULES
1019 
1020 # Modules not configured
1021 # ---------------------------------------------------------------------------
1022 
1023 modules modules_install: FORCE
1024         @echo >&2
1025         @echo >&2 "The present kernel configuration has modules disabled."
1026         @echo >&2 "Type 'make config' and enable loadable module support."
1027         @echo >&2 "Then build a kernel with module support enabled."
1028         @echo >&2
1029         @exit 1
1030 
1031 endif # CONFIG_MODULES
1032 
1033 ###
1034 # Cleaning is done on three levels.
1035 # make clean     Delete most generated files
1036 #                Leave enough to build external modules
1037 # make mrproper  Delete the current configuration, and all generated files
1038 # make distclean Remove editor backup files, patch leftover files and the like
1039 
1040 # Directories & files removed with 'make clean'
1041 CLEAN_DIRS  += $(MODVERDIR)
1042 
1043 # Directories & files removed with 'make mrproper'
1044 MRPROPER_DIRS  += include/config usr/include include/generated          \
1045                   arch/*/include/generated
1046 MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1047                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1048                   signing_key.priv signing_key.x509 x509.genkey         \
1049                   extra_certificates signing_key.x509.keyid             \
1050                   signing_key.x509.signer
1051 
1052 # clean - Delete most, but leave enough to build external modules
1053 #
1054 clean: rm-dirs  := $(CLEAN_DIRS)
1055 clean: rm-files := $(CLEAN_FILES)
1056 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1057 
1058 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1059 $(clean-dirs):
1060         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1061 
1062 vmlinuxclean:
1063         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1064 
1065 clean: archclean vmlinuxclean
1066 
1067 # mrproper - Delete all generated files, including .config
1068 #
1069 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1070 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1071 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1072 
1073 PHONY += $(mrproper-dirs) mrproper archmrproper
1074 $(mrproper-dirs):
1075         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1076 
1077 mrproper: clean archmrproper $(mrproper-dirs)
1078         $(call cmd,rmdirs)
1079         $(call cmd,rmfiles)
1080 
1081 # distclean
1082 #
1083 PHONY += distclean
1084 
1085 distclean: mrproper
1086         @find $(srctree) $(RCS_FIND_IGNORE) \
1087                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1088                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1089                 -o -name '.*.rej' \
1090                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1091                 -type f -print | xargs rm -f
1092 
1093 
1094 # Packaging of the kernel to various formats
1095 # ---------------------------------------------------------------------------
1096 # rpm target kept for backward compatibility
1097 package-dir     := $(srctree)/scripts/package
1098 
1099 %src-pkg: FORCE
1100         $(Q)$(MAKE) $(build)=$(package-dir) $@
1101 %pkg: include/config/kernel.release FORCE
1102         $(Q)$(MAKE) $(build)=$(package-dir) $@
1103 rpm: include/config/kernel.release FORCE
1104         $(Q)$(MAKE) $(build)=$(package-dir) $@
1105 
1106 
1107 # Brief documentation of the typical targets used
1108 # ---------------------------------------------------------------------------
1109 
1110 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1111 boards := $(notdir $(boards))
1112 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1113 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1114 
1115 help:
1116         @echo  'Cleaning targets:'
1117         @echo  '  clean           - Remove most generated files but keep the config and'
1118         @echo  '                    enough build support to build external modules'
1119         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1120         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1121         @echo  ''
1122         @echo  'Configuration targets:'
1123         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1124         @echo  ''
1125         @echo  'Other generic targets:'
1126         @echo  '  all             - Build all targets marked with [*]'
1127         @echo  '* vmlinux         - Build the bare kernel'
1128         @echo  '* modules         - Build all modules'
1129         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1130         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1131         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1132         @echo  '  dir/            - Build all files in dir and below'
1133         @echo  '  dir/file.[oisS] - Build specified target only'
1134         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1135         @echo  '                    (requires a recent binutils and recent build (System.map))'
1136         @echo  '  dir/file.ko     - Build module including final link'
1137         @echo  '  modules_prepare - Set up for building external modules'
1138         @echo  '  tags/TAGS       - Generate tags file for editors'
1139         @echo  '  cscope          - Generate cscope index'
1140         @echo  '  gtags           - Generate GNU GLOBAL index'
1141         @echo  '  kernelrelease   - Output the release version string'
1142         @echo  '  kernelversion   - Output the version stored in Makefile'
1143         @echo  '  image_name      - Output the image name'
1144         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1145          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1146          echo  ''
1147         @echo  'Static analysers'
1148         @echo  '  checkstack      - Generate a list of stack hogs'
1149         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1150         @echo  '  versioncheck    - Sanity check on version.h usage'
1151         @echo  '  includecheck    - Check for duplicate included header files'
1152         @echo  '  export_report   - List the usages of all exported symbols'
1153         @echo  '  headers_check   - Sanity check on exported headers'
1154         @echo  '  headerdep       - Detect inclusion cycles in headers'
1155         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1156         @echo  ''
1157         @echo  'Kernel packaging:'
1158         @$(MAKE) $(build)=$(package-dir) help
1159         @echo  ''
1160         @echo  'Documentation targets:'
1161         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1162         @echo  ''
1163         @echo  'Architecture specific targets ($(SRCARCH)):'
1164         @$(if $(archhelp),$(archhelp),\
1165                 echo '  No architecture specific help defined for $(SRCARCH)')
1166         @echo  ''
1167         @$(if $(boards), \
1168                 $(foreach b, $(boards), \
1169                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1170                 echo '')
1171         @$(if $(board-dirs), \
1172                 $(foreach b, $(board-dirs), \
1173                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1174                 printf "  %-16s - Show all of the above\\n" help-boards; \
1175                 echo '')
1176 
1177         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1178         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1179         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1180         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1181         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1182         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1183         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1184         @echo  '                1: warnings which may be relevant and do not occur too often'
1185         @echo  '                2: warnings which occur quite often but may still be relevant'
1186         @echo  '                3: more obscure warnings, can most likely be ignored'
1187         @echo  '                Multiple levels can be combined with W=12 or W=123'
1188         @echo  ''
1189         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1190         @echo  'For further info see the ./README file'
1191 
1192 
1193 help-board-dirs := $(addprefix help-,$(board-dirs))
1194 
1195 help-boards: $(help-board-dirs)
1196 
1197 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1198 
1199 $(help-board-dirs): help-%:
1200         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1201         @$(if $(boards-per-dir), \
1202                 $(foreach b, $(boards-per-dir), \
1203                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1204                 echo '')
1205 
1206 
1207 # Documentation targets
1208 # ---------------------------------------------------------------------------
1209 %docs: scripts_basic FORCE
1210         $(Q)$(MAKE) $(build)=scripts build_docproc
1211         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1212 
1213 else # KBUILD_EXTMOD
1214 
1215 ###
1216 # External module support.
1217 # When building external modules the kernel used as basis is considered
1218 # read-only, and no consistency checks are made and the make
1219 # system is not used on the basis kernel. If updates are required
1220 # in the basis kernel ordinary make commands (without M=...) must
1221 # be used.
1222 #
1223 # The following are the only valid targets when building external
1224 # modules.
1225 # make M=dir clean     Delete all automatically generated files
1226 # make M=dir modules   Make all modules in specified dir
1227 # make M=dir           Same as 'make M=dir modules'
1228 # make M=dir modules_install
1229 #                      Install the modules built in the module directory
1230 #                      Assumes install directory is already created
1231 
1232 # We are always building modules
1233 KBUILD_MODULES := 1
1234 PHONY += crmodverdir
1235 crmodverdir:
1236         $(cmd_crmodverdir)
1237 
1238 PHONY += $(objtree)/Module.symvers
1239 $(objtree)/Module.symvers:
1240         @test -e $(objtree)/Module.symvers || ( \
1241         echo; \
1242         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1243         echo "           is missing; modules will have no dependencies and modversions."; \
1244         echo )
1245 
1246 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1247 PHONY += $(module-dirs) modules
1248 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1249         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1250 
1251 modules: $(module-dirs)
1252         @$(kecho) '  Building modules, stage 2.';
1253         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1254 
1255 PHONY += modules_install
1256 modules_install: _emodinst_ _emodinst_post
1257 
1258 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1259 PHONY += _emodinst_
1260 _emodinst_:
1261         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1262         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1263 
1264 PHONY += _emodinst_post
1265 _emodinst_post: _emodinst_
1266         $(call cmd,depmod)
1267 
1268 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1269 
1270 PHONY += $(clean-dirs) clean
1271 $(clean-dirs):
1272         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1273 
1274 clean:  rm-dirs := $(MODVERDIR)
1275 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1276 
1277 help:
1278         @echo  '  Building external modules.'
1279         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1280         @echo  ''
1281         @echo  '  modules         - default target, build the module(s)'
1282         @echo  '  modules_install - install the module'
1283         @echo  '  clean           - remove generated files in module directory only'
1284         @echo  ''
1285 
1286 # Dummies...
1287 PHONY += prepare scripts
1288 prepare: ;
1289 scripts: ;
1290 endif # KBUILD_EXTMOD
1291 
1292 clean: $(clean-dirs)
1293         $(call cmd,rmdirs)
1294         $(call cmd,rmfiles)
1295         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1296                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1297                 -o -name '*.ko.*' \
1298                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1299                 -o -name '*.symtypes' -o -name 'modules.order' \
1300                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1301                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1302 
1303 # Generate tags for editors
1304 # ---------------------------------------------------------------------------
1305 quiet_cmd_tags = GEN     $@
1306       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1307 
1308 tags TAGS cscope gtags: FORCE
1309         $(call cmd,tags)
1310 
1311 # Scripts to check various things for consistency
1312 # ---------------------------------------------------------------------------
1313 
1314 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1315 
1316 includecheck:
1317         find $(srctree)/* $(RCS_FIND_IGNORE) \
1318                 -name '*.[hcS]' -type f -print | sort \
1319                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1320 
1321 versioncheck:
1322         find $(srctree)/* $(RCS_FIND_IGNORE) \
1323                 -name '*.[hcS]' -type f -print | sort \
1324                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1325 
1326 coccicheck:
1327         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1328 
1329 namespacecheck:
1330         $(PERL) $(srctree)/scripts/namespace.pl
1331 
1332 export_report:
1333         $(PERL) $(srctree)/scripts/export_report.pl
1334 
1335 endif #ifeq ($(config-targets),1)
1336 endif #ifeq ($(mixed-targets),1)
1337 
1338 PHONY += checkstack kernelrelease kernelversion image_name
1339 
1340 # UML needs a little special treatment here.  It wants to use the host
1341 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1342 # else wants $(ARCH), including people doing cross-builds, which means
1343 # that $(SUBARCH) doesn't work here.
1344 ifeq ($(ARCH), um)
1345 CHECKSTACK_ARCH := $(SUBARCH)
1346 else
1347 CHECKSTACK_ARCH := $(ARCH)
1348 endif
1349 checkstack:
1350         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1351         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1352 
1353 kernelrelease:
1354         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1355 
1356 kernelversion:
1357         @echo $(KERNELVERSION)
1358 
1359 image_name:
1360         @echo $(KBUILD_IMAGE)
1361 
1362 # Clear a bunch of variables before executing the submake
1363 tools/: FORCE
1364         $(Q)mkdir -p $(objtree)/tools
1365         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1366 
1367 tools/%: FORCE
1368         $(Q)mkdir -p $(objtree)/tools
1369         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1370 
1371 # Single targets
1372 # ---------------------------------------------------------------------------
1373 # Single targets are compatible with:
1374 # - build with mixed source and output
1375 # - build with separate output dir 'make O=...'
1376 # - external modules
1377 #
1378 #  target-dir => where to store outputfile
1379 #  build-dir  => directory in kernel source tree to use
1380 
1381 ifeq ($(KBUILD_EXTMOD),)
1382         build-dir  = $(patsubst %/,%,$(dir $@))
1383         target-dir = $(dir $@)
1384 else
1385         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1386         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1387         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1388 endif
1389 
1390 %.s: %.c prepare scripts FORCE
1391         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1392 %.i: %.c prepare scripts FORCE
1393         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1394 %.o: %.c prepare scripts FORCE
1395         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1396 %.lst: %.c prepare scripts FORCE
1397         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1398 %.s: %.S prepare scripts FORCE
1399         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1400 %.o: %.S prepare scripts FORCE
1401         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1402 %.symtypes: %.c prepare scripts FORCE
1403         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1404 
1405 # Modules
1406 /: prepare scripts FORCE
1407         $(cmd_crmodverdir)
1408         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1409         $(build)=$(build-dir)
1410 %/: prepare scripts FORCE
1411         $(cmd_crmodverdir)
1412         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1413         $(build)=$(build-dir)
1414 %.ko: prepare scripts FORCE
1415         $(cmd_crmodverdir)
1416         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1417         $(build)=$(build-dir) $(@:.ko=.o)
1418         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1419 
1420 # FIXME Should go into a make.lib or something 
1421 # ===========================================================================
1422 
1423 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1424       cmd_rmdirs = rm -rf $(rm-dirs)
1425 
1426 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1427       cmd_rmfiles = rm -f $(rm-files)
1428 
1429 # Run depmod only if we have System.map and depmod is executable
1430 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1431       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1432                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1433 
1434 # Create temporary dir for module support files
1435 # clean it up only when building all modules
1436 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1437                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1438 
1439 # read all saved command lines
1440 
1441 targets := $(wildcard $(sort $(targets)))
1442 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1443 
1444 ifneq ($(cmd_files),)
1445   $(cmd_files): ;       # Do not try to update included dependency files
1446   include $(cmd_files)
1447 endif
1448 
1449 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1450 # Usage:
1451 # $(Q)$(MAKE) $(clean)=dir
1452 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1453 
1454 endif   # skip-makefile
1455 
1456 PHONY += FORCE
1457 FORCE:
1458 
1459 # Declare the contents of the .PHONY variable as phony.  We keep that
1460 # information in a variable so we can use it in if_changed and friends.
1461 .PHONY: $(PHONY)

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