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 = 14
  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 # 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 ($(filter 4.%,$(MAKE_VERSION)),)  # make-4
315 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
316   quiet=silent_
317 endif
318 else                                    # make-3.8x
319 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
320   quiet=silent_
321 endif
322 endif
323 
324 export quiet Q KBUILD_VERBOSE
325 
326 
327 # Look for make include files relative to root of kernel src
328 MAKEFLAGS += --include-dir=$(srctree)
329 
330 # We need some generic definitions (do not try to remake the file).
331 $(srctree)/scripts/Kbuild.include: ;
332 include $(srctree)/scripts/Kbuild.include
333 
334 # Make variables (CC, etc...)
335 
336 AS              = $(CROSS_COMPILE)as
337 LD              = $(CROSS_COMPILE)ld
338 CC              = $(CROSS_COMPILE)gcc
339 CPP             = $(CC) -E
340 AR              = $(CROSS_COMPILE)ar
341 NM              = $(CROSS_COMPILE)nm
342 STRIP           = $(CROSS_COMPILE)strip
343 OBJCOPY         = $(CROSS_COMPILE)objcopy
344 OBJDUMP         = $(CROSS_COMPILE)objdump
345 AWK             = awk
346 GENKSYMS        = scripts/genksyms/genksyms
347 INSTALLKERNEL  := installkernel
348 DEPMOD          = /sbin/depmod
349 PERL            = perl
350 CHECK           = sparse
351 
352 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
353                   -Wbitwise -Wno-return-void $(CF)
354 CFLAGS_MODULE   =
355 AFLAGS_MODULE   =
356 LDFLAGS_MODULE  =
357 CFLAGS_KERNEL   =
358 AFLAGS_KERNEL   =
359 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage
360 
361 
362 # Use USERINCLUDE when you must reference the UAPI directories only.
363 USERINCLUDE    := \
364                 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
365                 -Iarch/$(hdr-arch)/include/generated/uapi \
366                 -I$(srctree)/include/uapi \
367                 -Iinclude/generated/uapi \
368                 -include $(srctree)/include/linux/kconfig.h
369 
370 # Use LINUXINCLUDE when you must reference the include/ directory.
371 # Needed to be compatible with the O= option
372 LINUXINCLUDE    := \
373                 -I$(srctree)/arch/$(hdr-arch)/include \
374                 -Iarch/$(hdr-arch)/include/generated \
375                 $(if $(KBUILD_SRC), -I$(srctree)/include) \
376                 -Iinclude \
377                 $(USERINCLUDE)
378 
379 KBUILD_CPPFLAGS := -D__KERNEL__
380 
381 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
382                    -fno-strict-aliasing -fno-common \
383                    -Werror-implicit-function-declaration \
384                    -Wno-format-security \
385                    -fno-delete-null-pointer-checks
386 KBUILD_AFLAGS_KERNEL :=
387 KBUILD_CFLAGS_KERNEL :=
388 KBUILD_AFLAGS   := -D__ASSEMBLY__
389 KBUILD_AFLAGS_MODULE  := -DMODULE
390 KBUILD_CFLAGS_MODULE  := -DMODULE
391 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
392 
393 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
394 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
395 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
396 
397 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
398 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
399 export CPP AR NM STRIP OBJCOPY OBJDUMP
400 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
401 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
402 
403 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
404 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
405 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
406 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
407 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
408 export KBUILD_ARFLAGS
409 
410 # When compiling out-of-tree modules, put MODVERDIR in the module
411 # tree rather than in the kernel tree. The kernel tree might
412 # even be read-only.
413 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
414 
415 # Files to ignore in find ... statements
416 
417 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \
418                    -o -name .pc -o -name .hg -o -name .git \) -prune -o
419 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
420                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
421 
422 # ===========================================================================
423 # Rules shared between *config targets and build targets
424 
425 # Basic helpers built in scripts/
426 PHONY += scripts_basic
427 scripts_basic:
428         $(Q)$(MAKE) $(build)=scripts/basic
429         $(Q)rm -f .tmp_quiet_recordmcount
430 
431 # To avoid any implicit rule to kick in, define an empty command.
432 scripts/basic/%: scripts_basic ;
433 
434 PHONY += outputmakefile
435 # outputmakefile generates a Makefile in the output directory, if using a
436 # separate output directory. This allows convenient use of make in the
437 # output directory.
438 outputmakefile:
439 ifneq ($(KBUILD_SRC),)
440         $(Q)ln -fsn $(srctree) source
441         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
442             $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
443 endif
444 
445 # Support for using generic headers in asm-generic
446 PHONY += asm-generic
447 asm-generic:
448         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
449                     src=asm obj=arch/$(SRCARCH)/include/generated/asm
450         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
451                     src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
452 
453 # To make sure we do not include .config for any of the *config targets
454 # catch them early, and hand them over to scripts/kconfig/Makefile
455 # It is allowed to specify more targets when calling make, including
456 # mixing *config targets and build targets.
457 # For example 'make oldconfig all'.
458 # Detect when mixed targets is specified, and make a second invocation
459 # of make so .config is not included in this case either (for *config).
460 
461 version_h := include/generated/uapi/linux/version.h
462 
463 no-dot-config-targets := clean mrproper distclean \
464                          cscope gtags TAGS tags help %docs check% coccicheck \
465                          $(version_h) headers_% archheaders archscripts \
466                          kernelversion %src-pkg
467 
468 config-targets := 0
469 mixed-targets  := 0
470 dot-config     := 1
471 
472 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
473         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
474                 dot-config := 0
475         endif
476 endif
477 
478 ifeq ($(KBUILD_EXTMOD),)
479         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
480                 config-targets := 1
481                 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
482                         mixed-targets := 1
483                 endif
484         endif
485 endif
486 
487 ifeq ($(mixed-targets),1)
488 # ===========================================================================
489 # We're called with mixed targets (*config and build targets).
490 # Handle them one by one.
491 
492 %:: FORCE
493         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
494 
495 else
496 ifeq ($(config-targets),1)
497 # ===========================================================================
498 # *config targets only - make sure prerequisites are updated, and descend
499 # in scripts/kconfig to make the *config target
500 
501 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
502 # KBUILD_DEFCONFIG may point out an alternative default configuration
503 # used for 'make defconfig'
504 include $(srctree)/arch/$(SRCARCH)/Makefile
505 export KBUILD_DEFCONFIG KBUILD_KCONFIG
506 
507 config: scripts_basic outputmakefile FORCE
508         $(Q)mkdir -p include/linux include/config
509         $(Q)$(MAKE) $(build)=scripts/kconfig $@
510 
511 %config: scripts_basic outputmakefile FORCE
512         $(Q)mkdir -p include/linux include/config
513         $(Q)$(MAKE) $(build)=scripts/kconfig $@
514 
515 else
516 # ===========================================================================
517 # Build targets only - this includes vmlinux, arch specific targets, clean
518 # targets and others. In general all targets except *config targets.
519 
520 ifeq ($(KBUILD_EXTMOD),)
521 # Additional helpers built in scripts/
522 # Carefully list dependencies so we do not try to build scripts twice
523 # in parallel
524 PHONY += scripts
525 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
526          asm-generic
527         $(Q)$(MAKE) $(build)=$(@)
528 
529 # Objects we will link into vmlinux / subdirs we need to visit
530 init-y          := init/
531 drivers-y       := drivers/ sound/ firmware/
532 net-y           := net/
533 libs-y          := lib/
534 core-y          := usr/
535 endif # KBUILD_EXTMOD
536 
537 ifeq ($(dot-config),1)
538 # Read in config
539 -include include/config/auto.conf
540 
541 ifeq ($(KBUILD_EXTMOD),)
542 # Read in dependencies to all Kconfig* files, make sure to run
543 # oldconfig if changes are detected.
544 -include include/config/auto.conf.cmd
545 
546 # To avoid any implicit rule to kick in, define an empty command
547 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
548 
549 # If .config is newer than include/config/auto.conf, someone tinkered
550 # with it and forgot to run make oldconfig.
551 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
552 # we execute the config step to be sure to catch updated Kconfig files
553 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
554         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
555 else
556 # external modules needs include/generated/autoconf.h and include/config/auto.conf
557 # but do not care if they are up-to-date. Use auto.conf to trigger the test
558 PHONY += include/config/auto.conf
559 
560 include/config/auto.conf:
561         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
562         echo >&2;                                                       \
563         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
564         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
565         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
566         echo >&2 ;                                                      \
567         /bin/false)
568 
569 endif # KBUILD_EXTMOD
570 
571 else
572 # Dummy target needed, because used as prerequisite
573 include/config/auto.conf: ;
574 endif # $(dot-config)
575 
576 # The all: target is the default when no target is given on the
577 # command line.
578 # This allow a user to issue only 'make' to build a kernel including modules
579 # Defaults to vmlinux, but the arch makefile usually adds further targets
580 all: vmlinux
581 
582 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
583 KBUILD_CFLAGS   += -Os $(call cc-disable-warning,maybe-uninitialized,)
584 else
585 KBUILD_CFLAGS   += -O2
586 endif
587 
588 include $(srctree)/arch/$(SRCARCH)/Makefile
589 
590 ifdef CONFIG_READABLE_ASM
591 # Disable optimizations that make assembler listings hard to read.
592 # reorder blocks reorders the control in the function
593 # ipa clone creates specialized cloned functions
594 # partial inlining inlines only parts of functions
595 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
596                  $(call cc-option,-fno-ipa-cp-clone,) \
597                  $(call cc-option,-fno-partial-inlining)
598 endif
599 
600 ifneq ($(CONFIG_FRAME_WARN),0)
601 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
602 endif
603 
604 # Handle stack protector mode.
605 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
606   stackp-flag := -fstack-protector
607   ifeq ($(call cc-option, $(stackp-flag)),)
608     $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
609              -fstack-protector not supported by compiler)
610   endif
611 else
612 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
613   stackp-flag := -fstack-protector-strong
614   ifeq ($(call cc-option, $(stackp-flag)),)
615     $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
616               -fstack-protector-strong not supported by compiler)
617   endif
618 else
619   # Force off for distro compilers that enable stack protector by default.
620   stackp-flag := $(call cc-option, -fno-stack-protector)
621 endif
622 endif
623 KBUILD_CFLAGS += $(stackp-flag)
624 
625 # This warning generated too much noise in a regular build.
626 # Use make W=1 to enable this warning (see scripts/Makefile.build)
627 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
628 
629 ifdef CONFIG_FRAME_POINTER
630 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
631 else
632 # Some targets (ARM with Thumb2, for example), can't be built with frame
633 # pointers.  For those, we don't have FUNCTION_TRACER automatically
634 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
635 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
636 # -fomit-frame-pointer with FUNCTION_TRACER.
637 ifndef CONFIG_FUNCTION_TRACER
638 KBUILD_CFLAGS   += -fomit-frame-pointer
639 endif
640 endif
641 
642 ifdef CONFIG_DEBUG_INFO
643 KBUILD_CFLAGS   += -g
644 KBUILD_AFLAGS   += -Wa,--gdwarf-2
645 endif
646 
647 ifdef CONFIG_DEBUG_INFO_REDUCED
648 KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
649                    $(call cc-option,-fno-var-tracking)
650 endif
651 
652 ifdef CONFIG_FUNCTION_TRACER
653 ifdef CONFIG_HAVE_FENTRY
654 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
655 endif
656 KBUILD_CFLAGS   += -pg $(CC_USING_FENTRY)
657 KBUILD_AFLAGS   += $(CC_USING_FENTRY)
658 ifdef CONFIG_DYNAMIC_FTRACE
659         ifdef CONFIG_HAVE_C_RECORDMCOUNT
660                 BUILD_C_RECORDMCOUNT := y
661                 export BUILD_C_RECORDMCOUNT
662         endif
663 endif
664 endif
665 
666 # We trigger additional mismatches with less inlining
667 ifdef CONFIG_DEBUG_SECTION_MISMATCH
668 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
669 endif
670 
671 # arch Makefile may override CC so keep this after arch Makefile is included
672 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
673 CHECKFLAGS     += $(NOSTDINC_FLAGS)
674 
675 # warn about C99 declaration after statement
676 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
677 
678 # disable pointer signed / unsigned warnings in gcc 4.0
679 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
680 
681 # disable invalid "can't wrap" optimizations for signed / pointers
682 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
683 
684 # conserve stack if available
685 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
686 
687 # disallow errors like 'EXPORT_GPL(foo);' with missing header
688 KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
689 
690 # require functions to have arguments in prototypes, not empty 'int foo()'
691 KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
692 
693 # Prohibit date/time macros, which would make the build non-deterministic
694 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
695 
696 # use the deterministic mode of AR if available
697 KBUILD_ARFLAGS := $(call ar-option,D)
698 
699 # check for 'asm goto'
700 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
701         KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
702 endif
703 
704 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
705 KBUILD_CPPFLAGS += $(KCPPFLAGS)
706 KBUILD_AFLAGS += $(KAFLAGS)
707 KBUILD_CFLAGS += $(KCFLAGS)
708 
709 # Use --build-id when available.
710 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
711                               $(call cc-ldoption, -Wl$(comma)--build-id,))
712 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
713 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
714 
715 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
716 LDFLAGS_vmlinux += $(call ld-option, -X,)
717 endif
718 
719 # Default kernel image to build when no specific target is given.
720 # KBUILD_IMAGE may be overruled on the command line or
721 # set in the environment
722 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
723 # this default value
724 export KBUILD_IMAGE ?= vmlinux
725 
726 #
727 # INSTALL_PATH specifies where to place the updated kernel and system map
728 # images. Default is /boot, but you can set it to other values
729 export  INSTALL_PATH ?= /boot
730 
731 #
732 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
733 # relocations required by build roots.  This is not defined in the
734 # makefile but the argument can be passed to make if needed.
735 #
736 
737 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
738 export MODLIB
739 
740 #
741 #  INSTALL_MOD_STRIP, if defined, will cause modules to be
742 #  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
743 #  the default option --strip-debug will be used.  Otherwise,
744 #  INSTALL_MOD_STRIP value will be used as the options to the strip command.
745 
746 ifdef INSTALL_MOD_STRIP
747 ifeq ($(INSTALL_MOD_STRIP),1)
748 mod_strip_cmd = $(STRIP) --strip-debug
749 else
750 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
751 endif # INSTALL_MOD_STRIP=1
752 else
753 mod_strip_cmd = true
754 endif # INSTALL_MOD_STRIP
755 export mod_strip_cmd
756 
757 # Select initial ramdisk compression format, default is gzip(1).
758 # This shall be used by the dracut(8) tool while creating an initramfs image.
759 #
760 INITRD_COMPRESS-y                  := gzip
761 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
762 INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
763 INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
764 INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
765 INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
766 # do not export INITRD_COMPRESS, since we didn't actually
767 # choose a sane default compression above.
768 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
769 
770 ifdef CONFIG_MODULE_SIG_ALL
771 MODSECKEY = ./signing_key.priv
772 MODPUBKEY = ./signing_key.x509
773 export MODPUBKEY
774 mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
775 else
776 mod_sign_cmd = true
777 endif
778 export mod_sign_cmd
779 
780 
781 ifeq ($(KBUILD_EXTMOD),)
782 core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
783 
784 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
785                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
786                      $(net-y) $(net-m) $(libs-y) $(libs-m)))
787 
788 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
789                      $(init-n) $(init-) \
790                      $(core-n) $(core-) $(drivers-n) $(drivers-) \
791                      $(net-n)  $(net-)  $(libs-n)    $(libs-))))
792 
793 init-y          := $(patsubst %/, %/built-in.o, $(init-y))
794 core-y          := $(patsubst %/, %/built-in.o, $(core-y))
795 drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
796 net-y           := $(patsubst %/, %/built-in.o, $(net-y))
797 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
798 libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
799 libs-y          := $(libs-y1) $(libs-y2)
800 
801 # Externally visible symbols (used by link-vmlinux.sh)
802 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
803 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
804 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
805 export LDFLAGS_vmlinux
806 # used by scripts/pacmage/Makefile
807 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
808 
809 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
810 
811 # Final link of vmlinux
812       cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
813 quiet_cmd_link-vmlinux = LINK    $@
814 
815 # Include targets which we want to
816 # execute if the rest of the kernel build went well.
817 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
818 ifdef CONFIG_HEADERS_CHECK
819         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
820 endif
821 ifdef CONFIG_SAMPLES
822         $(Q)$(MAKE) $(build)=samples
823 endif
824 ifdef CONFIG_BUILD_DOCSRC
825         $(Q)$(MAKE) $(build)=Documentation
826 endif
827         +$(call if_changed,link-vmlinux)
828 
829 # The actual objects are generated when descending, 
830 # make sure no implicit rule kicks in
831 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
832 
833 # Handle descending into subdirectories listed in $(vmlinux-dirs)
834 # Preset locale variables to speed up the build process. Limit locale
835 # tweaks to this spot to avoid wrong language settings when running
836 # make menuconfig etc.
837 # Error messages still appears in the original language
838 
839 PHONY += $(vmlinux-dirs)
840 $(vmlinux-dirs): prepare scripts
841         $(Q)$(MAKE) $(build)=$@
842 
843 define filechk_kernel.release
844         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
845 endef
846 
847 # Store (new) KERNELRELEASE string in include/config/kernel.release
848 include/config/kernel.release: include/config/auto.conf FORCE
849         $(call filechk,kernel.release)
850 
851 
852 # Things we need to do before we recursively start building the kernel
853 # or the modules are listed in "prepare".
854 # A multi level approach is used. prepareN is processed before prepareN-1.
855 # archprepare is used in arch Makefiles and when processed asm symlink,
856 # version.h and scripts_basic is processed / created.
857 
858 # Listed in dependency order
859 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
860 
861 # prepare3 is used to check if we are building in a separate output directory,
862 # and if so do:
863 # 1) Check that make has not been executed in the kernel src $(srctree)
864 prepare3: include/config/kernel.release
865 ifneq ($(KBUILD_SRC),)
866         @$(kecho) '  Using $(srctree) as source for kernel'
867         $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
868                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
869                 echo >&2 "  in the '$(srctree)' directory.";\
870                 /bin/false; \
871         fi;
872 endif
873 
874 # prepare2 creates a makefile if using a separate output directory
875 prepare2: prepare3 outputmakefile asm-generic
876 
877 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
878                    include/config/auto.conf
879         $(cmd_crmodverdir)
880 
881 archprepare: archheaders archscripts prepare1 scripts_basic
882 
883 prepare0: archprepare FORCE
884         $(Q)$(MAKE) $(build)=.
885 
886 # All the preparing..
887 prepare: prepare0
888 
889 # Generate some files
890 # ---------------------------------------------------------------------------
891 
892 # KERNELRELEASE can change from a few different places, meaning version.h
893 # needs to be updated, so this check is forced on all builds
894 
895 uts_len := 64
896 define filechk_utsrelease.h
897         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
898           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
899           exit 1;                                                         \
900         fi;                                                               \
901         (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
902 endef
903 
904 define filechk_version.h
905         (echo \#define LINUX_VERSION_CODE $(shell                         \
906         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
907         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
908 endef
909 
910 $(version_h): $(srctree)/Makefile FORCE
911         $(call filechk,version.h)
912 
913 include/generated/utsrelease.h: include/config/kernel.release FORCE
914         $(call filechk,utsrelease.h)
915 
916 PHONY += headerdep
917 headerdep:
918         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
919         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
920 
921 # ---------------------------------------------------------------------------
922 
923 PHONY += depend dep
924 depend dep:
925         @echo '*** Warning: make $@ is unnecessary now.'
926 
927 # ---------------------------------------------------------------------------
928 # Firmware install
929 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
930 export INSTALL_FW_PATH
931 
932 PHONY += firmware_install
933 firmware_install: FORCE
934         @mkdir -p $(objtree)/firmware
935         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
936 
937 # ---------------------------------------------------------------------------
938 # Kernel headers
939 
940 #Default location for installed headers
941 export INSTALL_HDR_PATH = $(objtree)/usr
942 
943 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
944 
945 # If we do an all arch process set dst to asm-$(hdr-arch)
946 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
947 
948 PHONY += archheaders
949 archheaders:
950 
951 PHONY += archscripts
952 archscripts:
953 
954 PHONY += __headers
955 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
956         $(Q)$(MAKE) $(build)=scripts build_unifdef
957 
958 PHONY += headers_install_all
959 headers_install_all:
960         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
961 
962 PHONY += headers_install
963 headers_install: __headers
964         $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
965           $(error Headers not exportable for the $(SRCARCH) architecture))
966         $(Q)$(MAKE) $(hdr-inst)=include/uapi
967         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
968 
969 PHONY += headers_check_all
970 headers_check_all: headers_install_all
971         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
972 
973 PHONY += headers_check
974 headers_check: headers_install
975         $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
976         $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
977 
978 # ---------------------------------------------------------------------------
979 # Modules
980 
981 ifdef CONFIG_MODULES
982 
983 # By default, build modules as well
984 
985 all: modules
986 
987 #       Build modules
988 #
989 #       A module can be listed more than once in obj-m resulting in
990 #       duplicate lines in modules.order files.  Those are removed
991 #       using awk while concatenating to the final file.
992 
993 PHONY += modules
994 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
995         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
996         @$(kecho) '  Building modules, stage 2.';
997         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
998         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
999 
1000 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1001         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1002 
1003 %/modules.builtin: include/config/auto.conf
1004         $(Q)$(MAKE) $(modbuiltin)=$*
1005 
1006 
1007 # Target to prepare building external modules
1008 PHONY += modules_prepare
1009 modules_prepare: prepare scripts
1010 
1011 # Target to install modules
1012 PHONY += modules_install
1013 modules_install: _modinst_ _modinst_post
1014 
1015 PHONY += _modinst_
1016 _modinst_:
1017         @rm -rf $(MODLIB)/kernel
1018         @rm -f $(MODLIB)/source
1019         @mkdir -p $(MODLIB)/kernel
1020         @ln -s $(srctree) $(MODLIB)/source
1021         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1022                 rm -f $(MODLIB)/build ; \
1023                 ln -s $(objtree) $(MODLIB)/build ; \
1024         fi
1025         @cp -f $(objtree)/modules.order $(MODLIB)/
1026         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1027         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1028 
1029 # This depmod is only for convenience to give the initial
1030 # boot a modules.dep even before / is mounted read-write.  However the
1031 # boot script depmod is the master version.
1032 PHONY += _modinst_post
1033 _modinst_post: _modinst_
1034         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1035         $(call cmd,depmod)
1036 
1037 ifeq ($(CONFIG_MODULE_SIG), y)
1038 PHONY += modules_sign
1039 modules_sign:
1040         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1041 endif
1042 
1043 else # CONFIG_MODULES
1044 
1045 # Modules not configured
1046 # ---------------------------------------------------------------------------
1047 
1048 modules modules_install: FORCE
1049         @echo >&2
1050         @echo >&2 "The present kernel configuration has modules disabled."
1051         @echo >&2 "Type 'make config' and enable loadable module support."
1052         @echo >&2 "Then build a kernel with module support enabled."
1053         @echo >&2
1054         @exit 1
1055 
1056 endif # CONFIG_MODULES
1057 
1058 ###
1059 # Cleaning is done on three levels.
1060 # make clean     Delete most generated files
1061 #                Leave enough to build external modules
1062 # make mrproper  Delete the current configuration, and all generated files
1063 # make distclean Remove editor backup files, patch leftover files and the like
1064 
1065 # Directories & files removed with 'make clean'
1066 CLEAN_DIRS  += $(MODVERDIR)
1067 
1068 # Directories & files removed with 'make mrproper'
1069 MRPROPER_DIRS  += include/config usr/include include/generated          \
1070                   arch/*/include/generated
1071 MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1072                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1073                   signing_key.priv signing_key.x509 x509.genkey         \
1074                   extra_certificates signing_key.x509.keyid             \
1075                   signing_key.x509.signer
1076 
1077 # clean - Delete most, but leave enough to build external modules
1078 #
1079 clean: rm-dirs  := $(CLEAN_DIRS)
1080 clean: rm-files := $(CLEAN_FILES)
1081 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1082 
1083 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1084 $(clean-dirs):
1085         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1086 
1087 vmlinuxclean:
1088         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1089 
1090 clean: archclean vmlinuxclean
1091 
1092 # mrproper - Delete all generated files, including .config
1093 #
1094 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1095 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1096 mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1097 
1098 PHONY += $(mrproper-dirs) mrproper archmrproper
1099 $(mrproper-dirs):
1100         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1101 
1102 mrproper: clean archmrproper $(mrproper-dirs)
1103         $(call cmd,rmdirs)
1104         $(call cmd,rmfiles)
1105 
1106 # distclean
1107 #
1108 PHONY += distclean
1109 
1110 distclean: mrproper
1111         @find $(srctree) $(RCS_FIND_IGNORE) \
1112                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1113                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1114                 -o -name '.*.rej' \
1115                 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1116                 -type f -print | xargs rm -f
1117 
1118 
1119 # Packaging of the kernel to various formats
1120 # ---------------------------------------------------------------------------
1121 # rpm target kept for backward compatibility
1122 package-dir     := $(srctree)/scripts/package
1123 
1124 %src-pkg: FORCE
1125         $(Q)$(MAKE) $(build)=$(package-dir) $@
1126 %pkg: include/config/kernel.release FORCE
1127         $(Q)$(MAKE) $(build)=$(package-dir) $@
1128 rpm: include/config/kernel.release FORCE
1129         $(Q)$(MAKE) $(build)=$(package-dir) $@
1130 
1131 
1132 # Brief documentation of the typical targets used
1133 # ---------------------------------------------------------------------------
1134 
1135 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1136 boards := $(notdir $(boards))
1137 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1138 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1139 
1140 help:
1141         @echo  'Cleaning targets:'
1142         @echo  '  clean           - Remove most generated files but keep the config and'
1143         @echo  '                    enough build support to build external modules'
1144         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1145         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1146         @echo  ''
1147         @echo  'Configuration targets:'
1148         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1149         @echo  ''
1150         @echo  'Other generic targets:'
1151         @echo  '  all             - Build all targets marked with [*]'
1152         @echo  '* vmlinux         - Build the bare kernel'
1153         @echo  '* modules         - Build all modules'
1154         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1155         @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1156         @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1157         @echo  '  dir/            - Build all files in dir and below'
1158         @echo  '  dir/file.[oisS] - Build specified target only'
1159         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1160         @echo  '                    (requires a recent binutils and recent build (System.map))'
1161         @echo  '  dir/file.ko     - Build module including final link'
1162         @echo  '  modules_prepare - Set up for building external modules'
1163         @echo  '  tags/TAGS       - Generate tags file for editors'
1164         @echo  '  cscope          - Generate cscope index'
1165         @echo  '  gtags           - Generate GNU GLOBAL index'
1166         @echo  '  kernelrelease   - Output the release version string'
1167         @echo  '  kernelversion   - Output the version stored in Makefile'
1168         @echo  '  image_name      - Output the image name'
1169         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1170          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1171          echo  ''
1172         @echo  'Static analysers'
1173         @echo  '  checkstack      - Generate a list of stack hogs'
1174         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1175         @echo  '  versioncheck    - Sanity check on version.h usage'
1176         @echo  '  includecheck    - Check for duplicate included header files'
1177         @echo  '  export_report   - List the usages of all exported symbols'
1178         @echo  '  headers_check   - Sanity check on exported headers'
1179         @echo  '  headerdep       - Detect inclusion cycles in headers'
1180         @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1181         @echo  ''
1182         @echo  'Kernel packaging:'
1183         @$(MAKE) $(build)=$(package-dir) help
1184         @echo  ''
1185         @echo  'Documentation targets:'
1186         @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1187         @echo  ''
1188         @echo  'Architecture specific targets ($(SRCARCH)):'
1189         @$(if $(archhelp),$(archhelp),\
1190                 echo '  No architecture specific help defined for $(SRCARCH)')
1191         @echo  ''
1192         @$(if $(boards), \
1193                 $(foreach b, $(boards), \
1194                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1195                 echo '')
1196         @$(if $(board-dirs), \
1197                 $(foreach b, $(board-dirs), \
1198                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1199                 printf "  %-16s - Show all of the above\\n" help-boards; \
1200                 echo '')
1201 
1202         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1203         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1204         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1205         @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1206         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1207         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1208         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1209         @echo  '                1: warnings which may be relevant and do not occur too often'
1210         @echo  '                2: warnings which occur quite often but may still be relevant'
1211         @echo  '                3: more obscure warnings, can most likely be ignored'
1212         @echo  '                Multiple levels can be combined with W=12 or W=123'
1213         @echo  ''
1214         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1215         @echo  'For further info see the ./README file'
1216 
1217 
1218 help-board-dirs := $(addprefix help-,$(board-dirs))
1219 
1220 help-boards: $(help-board-dirs)
1221 
1222 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1223 
1224 $(help-board-dirs): help-%:
1225         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1226         @$(if $(boards-per-dir), \
1227                 $(foreach b, $(boards-per-dir), \
1228                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1229                 echo '')
1230 
1231 
1232 # Documentation targets
1233 # ---------------------------------------------------------------------------
1234 %docs: scripts_basic FORCE
1235         $(Q)$(MAKE) $(build)=scripts build_docproc
1236         $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1237 
1238 else # KBUILD_EXTMOD
1239 
1240 ###
1241 # External module support.
1242 # When building external modules the kernel used as basis is considered
1243 # read-only, and no consistency checks are made and the make
1244 # system is not used on the basis kernel. If updates are required
1245 # in the basis kernel ordinary make commands (without M=...) must
1246 # be used.
1247 #
1248 # The following are the only valid targets when building external
1249 # modules.
1250 # make M=dir clean     Delete all automatically generated files
1251 # make M=dir modules   Make all modules in specified dir
1252 # make M=dir           Same as 'make M=dir modules'
1253 # make M=dir modules_install
1254 #                      Install the modules built in the module directory
1255 #                      Assumes install directory is already created
1256 
1257 # We are always building modules
1258 KBUILD_MODULES := 1
1259 PHONY += crmodverdir
1260 crmodverdir:
1261         $(cmd_crmodverdir)
1262 
1263 PHONY += $(objtree)/Module.symvers
1264 $(objtree)/Module.symvers:
1265         @test -e $(objtree)/Module.symvers || ( \
1266         echo; \
1267         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1268         echo "           is missing; modules will have no dependencies and modversions."; \
1269         echo )
1270 
1271 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1272 PHONY += $(module-dirs) modules
1273 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1274         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1275 
1276 modules: $(module-dirs)
1277         @$(kecho) '  Building modules, stage 2.';
1278         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1279 
1280 PHONY += modules_install
1281 modules_install: _emodinst_ _emodinst_post
1282 
1283 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1284 PHONY += _emodinst_
1285 _emodinst_:
1286         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1287         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1288 
1289 PHONY += _emodinst_post
1290 _emodinst_post: _emodinst_
1291         $(call cmd,depmod)
1292 
1293 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1294 
1295 PHONY += $(clean-dirs) clean
1296 $(clean-dirs):
1297         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1298 
1299 clean:  rm-dirs := $(MODVERDIR)
1300 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1301 
1302 help:
1303         @echo  '  Building external modules.'
1304         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1305         @echo  ''
1306         @echo  '  modules         - default target, build the module(s)'
1307         @echo  '  modules_install - install the module'
1308         @echo  '  clean           - remove generated files in module directory only'
1309         @echo  ''
1310 
1311 # Dummies...
1312 PHONY += prepare scripts
1313 prepare: ;
1314 scripts: ;
1315 endif # KBUILD_EXTMOD
1316 
1317 clean: $(clean-dirs)
1318         $(call cmd,rmdirs)
1319         $(call cmd,rmfiles)
1320         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1321                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1322                 -o -name '*.ko.*' \
1323                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1324                 -o -name '*.symtypes' -o -name 'modules.order' \
1325                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1326                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1327 
1328 # Generate tags for editors
1329 # ---------------------------------------------------------------------------
1330 quiet_cmd_tags = GEN     $@
1331       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1332 
1333 tags TAGS cscope gtags: FORCE
1334         $(call cmd,tags)
1335 
1336 # Scripts to check various things for consistency
1337 # ---------------------------------------------------------------------------
1338 
1339 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1340 
1341 includecheck:
1342         find $(srctree)/* $(RCS_FIND_IGNORE) \
1343                 -name '*.[hcS]' -type f -print | sort \
1344                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1345 
1346 versioncheck:
1347         find $(srctree)/* $(RCS_FIND_IGNORE) \
1348                 -name '*.[hcS]' -type f -print | sort \
1349                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1350 
1351 coccicheck:
1352         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1353 
1354 namespacecheck:
1355         $(PERL) $(srctree)/scripts/namespace.pl
1356 
1357 export_report:
1358         $(PERL) $(srctree)/scripts/export_report.pl
1359 
1360 endif #ifeq ($(config-targets),1)
1361 endif #ifeq ($(mixed-targets),1)
1362 
1363 PHONY += checkstack kernelrelease kernelversion image_name
1364 
1365 # UML needs a little special treatment here.  It wants to use the host
1366 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1367 # else wants $(ARCH), including people doing cross-builds, which means
1368 # that $(SUBARCH) doesn't work here.
1369 ifeq ($(ARCH), um)
1370 CHECKSTACK_ARCH := $(SUBARCH)
1371 else
1372 CHECKSTACK_ARCH := $(ARCH)
1373 endif
1374 checkstack:
1375         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1376         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1377 
1378 kernelrelease:
1379         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1380 
1381 kernelversion:
1382         @echo $(KERNELVERSION)
1383 
1384 image_name:
1385         @echo $(KBUILD_IMAGE)
1386 
1387 # Clear a bunch of variables before executing the submake
1388 tools/: FORCE
1389         $(Q)mkdir -p $(objtree)/tools
1390         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1391 
1392 tools/%: FORCE
1393         $(Q)mkdir -p $(objtree)/tools
1394         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1395 
1396 # Single targets
1397 # ---------------------------------------------------------------------------
1398 # Single targets are compatible with:
1399 # - build with mixed source and output
1400 # - build with separate output dir 'make O=...'
1401 # - external modules
1402 #
1403 #  target-dir => where to store outputfile
1404 #  build-dir  => directory in kernel source tree to use
1405 
1406 ifeq ($(KBUILD_EXTMOD),)
1407         build-dir  = $(patsubst %/,%,$(dir $@))
1408         target-dir = $(dir $@)
1409 else
1410         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1411         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1412         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1413 endif
1414 
1415 %.s: %.c prepare scripts FORCE
1416         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1417 %.i: %.c prepare scripts FORCE
1418         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1419 %.o: %.c prepare scripts FORCE
1420         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1421 %.lst: %.c prepare scripts FORCE
1422         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1423 %.s: %.S prepare scripts FORCE
1424         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1425 %.o: %.S prepare scripts FORCE
1426         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1427 %.symtypes: %.c prepare scripts FORCE
1428         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1429 
1430 # Modules
1431 /: prepare scripts FORCE
1432         $(cmd_crmodverdir)
1433         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1434         $(build)=$(build-dir)
1435 %/: prepare scripts FORCE
1436         $(cmd_crmodverdir)
1437         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1438         $(build)=$(build-dir)
1439 %.ko: prepare scripts FORCE
1440         $(cmd_crmodverdir)
1441         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1442         $(build)=$(build-dir) $(@:.ko=.o)
1443         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1444 
1445 # FIXME Should go into a make.lib or something 
1446 # ===========================================================================
1447 
1448 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1449       cmd_rmdirs = rm -rf $(rm-dirs)
1450 
1451 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1452       cmd_rmfiles = rm -f $(rm-files)
1453 
1454 # Run depmod only if we have System.map and depmod is executable
1455 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1456       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1457                    $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1458 
1459 # Create temporary dir for module support files
1460 # clean it up only when building all modules
1461 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1462                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1463 
1464 # read all saved command lines
1465 
1466 targets := $(wildcard $(sort $(targets)))
1467 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1468 
1469 ifneq ($(cmd_files),)
1470   $(cmd_files): ;       # Do not try to update included dependency files
1471   include $(cmd_files)
1472 endif
1473 
1474 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1475 # Usage:
1476 # $(Q)$(MAKE) $(clean)=dir
1477 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1478 
1479 endif   # skip-makefile
1480 
1481 PHONY += FORCE
1482 FORCE:
1483 
1484 # Declare the contents of the .PHONY variable as phony.  We keep that
1485 # information in a variable so we can use it in if_changed and friends.
1486 .PHONY: $(PHONY)

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