Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-btrfs-devel.git] / Makefile
blob07bc92544e9cab9ea9fd201b8a5f36fb9dbb9168
1 VERSION = 3
2 PATCHLEVEL = 1
3 SUBLEVEL = 0
4 EXTRAVERSION =
5 NAME = "Divemaster Edition"
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.
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
19 # Avoid funny character set dependencies
20 unexport LC_ALL
21 LC_COLLATE=C
22 LC_NUMERIC=C
23 export LC_COLLATE LC_NUMERIC
25 # We are using a recursive build, so we need to do a little thinking
26 # to get the ordering right.
28 # Most importantly: sub-Makefiles should only ever modify files in
29 # their own directory. If in some directory we have a dependency on
30 # a file in another dir (which doesn't happen often, but it's often
31 # unavoidable when linking the built-in.o targets which finally
32 # turn into vmlinux), we will call a sub make in that other dir, and
33 # after that we are sure that everything which is in that other dir
34 # is now up to date.
36 # The only cases where we need to modify files which have global
37 # effects are thus separated out and done before the recursive
38 # descending is started. They are now explicitly listed as the
39 # prepare rule.
41 # To put more focus on warnings, be less verbose as default
42 # Use 'make V=1' to see the full commands
44 ifeq ("$(origin V)", "command line")
45 KBUILD_VERBOSE = $(V)
46 endif
47 ifndef KBUILD_VERBOSE
48 KBUILD_VERBOSE = 0
49 endif
51 # Call a source code checker (by default, "sparse") as part of the
52 # C compilation.
54 # Use 'make C=1' to enable checking of only re-compiled files.
55 # Use 'make C=2' to enable checking of *all* source files, regardless
56 # of whether they are re-compiled or not.
58 # See the file "Documentation/sparse.txt" for more details, including
59 # where to get the "sparse" utility.
61 ifeq ("$(origin C)", "command line")
62 KBUILD_CHECKSRC = $(C)
63 endif
64 ifndef KBUILD_CHECKSRC
65 KBUILD_CHECKSRC = 0
66 endif
68 # Use make M=dir to specify directory of external module to build
69 # Old syntax make ... SUBDIRS=$PWD is still supported
70 # Setting the environment variable KBUILD_EXTMOD take precedence
71 ifdef SUBDIRS
72 KBUILD_EXTMOD ?= $(SUBDIRS)
73 endif
75 ifeq ("$(origin M)", "command line")
76 KBUILD_EXTMOD := $(M)
77 endif
79 # kbuild supports saving output files in a separate directory.
80 # To locate output files in a separate directory two syntaxes are supported.
81 # In both cases the working directory must be the root of the kernel src.
82 # 1) O=
83 # Use "make O=dir/to/store/output/files/"
85 # 2) Set KBUILD_OUTPUT
86 # Set the environment variable KBUILD_OUTPUT to point to the directory
87 # where the output files shall be placed.
88 # export KBUILD_OUTPUT=dir/to/store/output/files/
89 # make
91 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
92 # variable.
95 # KBUILD_SRC is set on invocation of make in OBJ directory
96 # KBUILD_SRC is not intended to be used by the regular user (for now)
97 ifeq ($(KBUILD_SRC),)
99 # OK, Make called in directory where kernel src resides
100 # Do we want to locate output files in a separate directory?
101 ifeq ("$(origin O)", "command line")
102 KBUILD_OUTPUT := $(O)
103 endif
105 ifeq ("$(origin W)", "command line")
106 export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
107 endif
109 # That's our default target when none is given on the command line
110 PHONY := _all
111 _all:
113 # Cancel implicit rules on top Makefile
114 $(CURDIR)/Makefile Makefile: ;
116 ifneq ($(KBUILD_OUTPUT),)
117 # Invoke a second make in the output directory, passing relevant variables
118 # check that the output directory actually exists
119 saved-output := $(KBUILD_OUTPUT)
120 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
121 $(if $(KBUILD_OUTPUT),, \
122 $(error output directory "$(saved-output)" does not exist))
124 PHONY += $(MAKECMDGOALS) sub-make
126 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
127 $(Q)@:
129 sub-make: FORCE
130 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
131 KBUILD_SRC=$(CURDIR) \
132 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
133 $(filter-out _all sub-make,$(MAKECMDGOALS))
135 # Leave processing to above invocation of make
136 skip-makefile := 1
137 endif # ifneq ($(KBUILD_OUTPUT),)
138 endif # ifeq ($(KBUILD_SRC),)
140 # We process the rest of the Makefile if this is the final invocation of make
141 ifeq ($(skip-makefile),)
143 # If building an external module we do not care about the all: rule
144 # but instead _all depend on modules
145 PHONY += all
146 ifeq ($(KBUILD_EXTMOD),)
147 _all: all
148 else
149 _all: modules
150 endif
152 srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
153 objtree := $(CURDIR)
154 src := $(srctree)
155 obj := $(objtree)
157 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
159 export srctree objtree VPATH
162 # SUBARCH tells the usermode build what the underlying arch is. That is set
163 # first, and if a usermode build is happening, the "ARCH=um" on the command
164 # line overrides the setting of ARCH below. If a native build is happening,
165 # then ARCH is assigned, getting whatever value it gets normally, and
166 # SUBARCH is subsequently ignored.
168 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
169 -e s/arm.*/arm/ -e s/sa110/arm/ \
170 -e s/s390x/s390/ -e s/parisc64/parisc/ \
171 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
172 -e s/sh[234].*/sh/ )
174 # Cross compiling and selecting different set of gcc/bin-utils
175 # ---------------------------------------------------------------------------
177 # When performing cross compilation for other architectures ARCH shall be set
178 # to the target architecture. (See arch/* for the possibilities).
179 # ARCH can be set during invocation of make:
180 # make ARCH=ia64
181 # Another way is to have ARCH set in the environment.
182 # The default ARCH is the host where make is executed.
184 # CROSS_COMPILE specify the prefix used for all executables used
185 # during compilation. Only gcc and related bin-utils executables
186 # are prefixed with $(CROSS_COMPILE).
187 # CROSS_COMPILE can be set on the command line
188 # make CROSS_COMPILE=ia64-linux-
189 # Alternatively CROSS_COMPILE can be set in the environment.
190 # A third alternative is to store a setting in .config so that plain
191 # "make" in the configured kernel build directory always uses that.
192 # Default value for CROSS_COMPILE is not to prefix executables
193 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
194 export KBUILD_BUILDHOST := $(SUBARCH)
195 ARCH ?= $(SUBARCH)
196 CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
198 # Architecture as present in compile.h
199 UTS_MACHINE := $(ARCH)
200 SRCARCH := $(ARCH)
202 # Additional ARCH settings for x86
203 ifeq ($(ARCH),i386)
204 SRCARCH := x86
205 endif
206 ifeq ($(ARCH),x86_64)
207 SRCARCH := x86
208 endif
210 # Additional ARCH settings for sparc
211 ifeq ($(ARCH),sparc32)
212 SRCARCH := sparc
213 endif
214 ifeq ($(ARCH),sparc64)
215 SRCARCH := sparc
216 endif
218 # Additional ARCH settings for sh
219 ifeq ($(ARCH),sh64)
220 SRCARCH := sh
221 endif
223 # Additional ARCH settings for tile
224 ifeq ($(ARCH),tilepro)
225 SRCARCH := tile
226 endif
227 ifeq ($(ARCH),tilegx)
228 SRCARCH := tile
229 endif
231 # Where to locate arch specific headers
232 hdr-arch := $(SRCARCH)
234 ifeq ($(ARCH),m68knommu)
235 hdr-arch := m68k
236 endif
238 KCONFIG_CONFIG ?= .config
239 export KCONFIG_CONFIG
241 # SHELL used by kbuild
242 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
243 else if [ -x /bin/bash ]; then echo /bin/bash; \
244 else echo sh; fi ; fi)
246 HOSTCC = gcc
247 HOSTCXX = g++
248 HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
249 HOSTCXXFLAGS = -O2
251 # Decide whether to build built-in, modular, or both.
252 # Normally, just do built-in.
254 KBUILD_MODULES :=
255 KBUILD_BUILTIN := 1
257 # If we have only "make modules", don't compile built-in objects.
258 # When we're building modules with modversions, we need to consider
259 # the built-in objects during the descend as well, in order to
260 # make sure the checksums are up to date before we record them.
262 ifeq ($(MAKECMDGOALS),modules)
263 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
264 endif
266 # If we have "make <whatever> modules", compile modules
267 # in addition to whatever we do anyway.
268 # Just "make" or "make all" shall build modules as well
270 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
271 KBUILD_MODULES := 1
272 endif
274 ifeq ($(MAKECMDGOALS),)
275 KBUILD_MODULES := 1
276 endif
278 export KBUILD_MODULES KBUILD_BUILTIN
279 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
281 # Beautify output
282 # ---------------------------------------------------------------------------
284 # Normally, we echo the whole command before executing it. By making
285 # that echo $($(quiet)$(cmd)), we now have the possibility to set
286 # $(quiet) to choose other forms of output instead, e.g.
288 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
289 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
291 # If $(quiet) is empty, the whole command will be printed.
292 # If it is set to "quiet_", only the short version will be printed.
293 # If it is set to "silent_", nothing will be printed at all, since
294 # the variable $(silent_cmd_cc_o_c) doesn't exist.
296 # A simple variant is to prefix commands with $(Q) - that's useful
297 # for commands that shall be hidden in non-verbose mode.
299 # $(Q)ln $@ :<
301 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
302 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
304 ifeq ($(KBUILD_VERBOSE),1)
305 quiet =
307 else
308 quiet=quiet_
309 Q = @
310 endif
312 # If the user is running make -s (silent mode), suppress echoing of
313 # commands
315 ifneq ($(findstring s,$(MAKEFLAGS)),)
316 quiet=silent_
317 endif
319 export quiet Q KBUILD_VERBOSE
322 # Look for make include files relative to root of kernel src
323 MAKEFLAGS += --include-dir=$(srctree)
325 # We need some generic definitions (do not try to remake the file).
326 $(srctree)/scripts/Kbuild.include: ;
327 include $(srctree)/scripts/Kbuild.include
329 # Make variables (CC, etc...)
331 AS = $(CROSS_COMPILE)as
332 LD = $(CROSS_COMPILE)ld
333 CC = $(CROSS_COMPILE)gcc
334 CPP = $(CC) -E
335 AR = $(CROSS_COMPILE)ar
336 NM = $(CROSS_COMPILE)nm
337 STRIP = $(CROSS_COMPILE)strip
338 OBJCOPY = $(CROSS_COMPILE)objcopy
339 OBJDUMP = $(CROSS_COMPILE)objdump
340 AWK = awk
341 GENKSYMS = scripts/genksyms/genksyms
342 INSTALLKERNEL := installkernel
343 DEPMOD = /sbin/depmod
344 KALLSYMS = scripts/kallsyms
345 PERL = perl
346 CHECK = sparse
348 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
349 -Wbitwise -Wno-return-void $(CF)
350 CFLAGS_MODULE =
351 AFLAGS_MODULE =
352 LDFLAGS_MODULE =
353 CFLAGS_KERNEL =
354 AFLAGS_KERNEL =
355 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
358 # Use LINUXINCLUDE when you must reference the include/ directory.
359 # Needed to be compatible with the O= option
360 LINUXINCLUDE := -I$(srctree)/arch/$(hdr-arch)/include \
361 -Iarch/$(hdr-arch)/include/generated -Iinclude \
362 $(if $(KBUILD_SRC), -I$(srctree)/include) \
363 -include $(srctree)/include/linux/kconfig.h
365 KBUILD_CPPFLAGS := -D__KERNEL__
367 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
368 -fno-strict-aliasing -fno-common \
369 -Werror-implicit-function-declaration \
370 -Wno-format-security \
371 -fno-delete-null-pointer-checks
372 KBUILD_AFLAGS_KERNEL :=
373 KBUILD_CFLAGS_KERNEL :=
374 KBUILD_AFLAGS := -D__ASSEMBLY__
375 KBUILD_AFLAGS_MODULE := -DMODULE
376 KBUILD_CFLAGS_MODULE := -DMODULE
377 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
379 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
380 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
381 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
383 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
384 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
385 export CPP AR NM STRIP OBJCOPY OBJDUMP
386 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
387 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
389 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
390 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
391 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
392 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
393 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
394 export KBUILD_ARFLAGS
396 # When compiling out-of-tree modules, put MODVERDIR in the module
397 # tree rather than in the kernel tree. The kernel tree might
398 # even be read-only.
399 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
401 # Files to ignore in find ... statements
403 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
404 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
406 # ===========================================================================
407 # Rules shared between *config targets and build targets
409 # Basic helpers built in scripts/
410 PHONY += scripts_basic
411 scripts_basic:
412 $(Q)$(MAKE) $(build)=scripts/basic
413 $(Q)rm -f .tmp_quiet_recordmcount
415 # To avoid any implicit rule to kick in, define an empty command.
416 scripts/basic/%: scripts_basic ;
418 PHONY += outputmakefile
419 # outputmakefile generates a Makefile in the output directory, if using a
420 # separate output directory. This allows convenient use of make in the
421 # output directory.
422 outputmakefile:
423 ifneq ($(KBUILD_SRC),)
424 $(Q)ln -fsn $(srctree) source
425 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
426 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
427 endif
429 # Support for using generic headers in asm-generic
430 PHONY += asm-generic
431 asm-generic:
432 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
433 obj=arch/$(SRCARCH)/include/generated/asm
435 # To make sure we do not include .config for any of the *config targets
436 # catch them early, and hand them over to scripts/kconfig/Makefile
437 # It is allowed to specify more targets when calling make, including
438 # mixing *config targets and build targets.
439 # For example 'make oldconfig all'.
440 # Detect when mixed targets is specified, and make a second invocation
441 # of make so .config is not included in this case either (for *config).
443 no-dot-config-targets := clean mrproper distclean \
444 cscope gtags TAGS tags help %docs check% coccicheck \
445 include/linux/version.h headers_% \
446 kernelversion %src-pkg
448 config-targets := 0
449 mixed-targets := 0
450 dot-config := 1
452 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
453 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
454 dot-config := 0
455 endif
456 endif
458 ifeq ($(KBUILD_EXTMOD),)
459 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
460 config-targets := 1
461 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
462 mixed-targets := 1
463 endif
464 endif
465 endif
467 ifeq ($(mixed-targets),1)
468 # ===========================================================================
469 # We're called with mixed targets (*config and build targets).
470 # Handle them one by one.
472 %:: FORCE
473 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
475 else
476 ifeq ($(config-targets),1)
477 # ===========================================================================
478 # *config targets only - make sure prerequisites are updated, and descend
479 # in scripts/kconfig to make the *config target
481 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
482 # KBUILD_DEFCONFIG may point out an alternative default configuration
483 # used for 'make defconfig'
484 include $(srctree)/arch/$(SRCARCH)/Makefile
485 export KBUILD_DEFCONFIG KBUILD_KCONFIG
487 config: scripts_basic outputmakefile FORCE
488 $(Q)mkdir -p include/linux include/config
489 $(Q)$(MAKE) $(build)=scripts/kconfig $@
491 %config: scripts_basic outputmakefile FORCE
492 $(Q)mkdir -p include/linux include/config
493 $(Q)$(MAKE) $(build)=scripts/kconfig $@
495 else
496 # ===========================================================================
497 # Build targets only - this includes vmlinux, arch specific targets, clean
498 # targets and others. In general all targets except *config targets.
500 ifeq ($(KBUILD_EXTMOD),)
501 # Additional helpers built in scripts/
502 # Carefully list dependencies so we do not try to build scripts twice
503 # in parallel
504 PHONY += scripts
505 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
506 $(Q)$(MAKE) $(build)=$(@)
508 # Objects we will link into vmlinux / subdirs we need to visit
509 init-y := init/
510 drivers-y := drivers/ sound/ firmware/
511 net-y := net/
512 libs-y := lib/
513 core-y := usr/
514 endif # KBUILD_EXTMOD
516 ifeq ($(dot-config),1)
517 # Read in config
518 -include include/config/auto.conf
520 ifeq ($(KBUILD_EXTMOD),)
521 # Read in dependencies to all Kconfig* files, make sure to run
522 # oldconfig if changes are detected.
523 -include include/config/auto.conf.cmd
525 # To avoid any implicit rule to kick in, define an empty command
526 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
528 # If .config is newer than include/config/auto.conf, someone tinkered
529 # with it and forgot to run make oldconfig.
530 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
531 # we execute the config step to be sure to catch updated Kconfig files
532 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
533 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
534 else
535 # external modules needs include/generated/autoconf.h and include/config/auto.conf
536 # but do not care if they are up-to-date. Use auto.conf to trigger the test
537 PHONY += include/config/auto.conf
539 include/config/auto.conf:
540 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
541 echo; \
542 echo " ERROR: Kernel configuration is invalid."; \
543 echo " include/generated/autoconf.h or $@ are missing.";\
544 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
545 echo; \
546 /bin/false)
548 endif # KBUILD_EXTMOD
550 else
551 # Dummy target needed, because used as prerequisite
552 include/config/auto.conf: ;
553 endif # $(dot-config)
555 # The all: target is the default when no target is given on the
556 # command line.
557 # This allow a user to issue only 'make' to build a kernel including modules
558 # Defaults to vmlinux, but the arch makefile usually adds further targets
559 all: vmlinux
561 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
562 KBUILD_CFLAGS += -Os
563 else
564 KBUILD_CFLAGS += -O2
565 endif
567 include $(srctree)/arch/$(SRCARCH)/Makefile
569 ifneq ($(CONFIG_FRAME_WARN),0)
570 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
571 endif
573 # Force gcc to behave correct even for buggy distributions
574 ifndef CONFIG_CC_STACKPROTECTOR
575 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
576 endif
578 # This warning generated too much noise in a regular build.
579 # Use make W=1 to enable this warning (see scripts/Makefile.build)
580 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
582 ifdef CONFIG_FRAME_POINTER
583 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
584 else
585 # Some targets (ARM with Thumb2, for example), can't be built with frame
586 # pointers. For those, we don't have FUNCTION_TRACER automatically
587 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
588 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
589 # -fomit-frame-pointer with FUNCTION_TRACER.
590 ifndef CONFIG_FUNCTION_TRACER
591 KBUILD_CFLAGS += -fomit-frame-pointer
592 endif
593 endif
595 ifdef CONFIG_DEBUG_INFO
596 KBUILD_CFLAGS += -g
597 KBUILD_AFLAGS += -gdwarf-2
598 endif
600 ifdef CONFIG_DEBUG_INFO_REDUCED
601 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly)
602 endif
604 ifdef CONFIG_FUNCTION_TRACER
605 KBUILD_CFLAGS += -pg
606 ifdef CONFIG_DYNAMIC_FTRACE
607 ifdef CONFIG_HAVE_C_RECORDMCOUNT
608 BUILD_C_RECORDMCOUNT := y
609 export BUILD_C_RECORDMCOUNT
610 endif
611 endif
612 endif
614 # We trigger additional mismatches with less inlining
615 ifdef CONFIG_DEBUG_SECTION_MISMATCH
616 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
617 endif
619 # arch Makefile may override CC so keep this after arch Makefile is included
620 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
621 CHECKFLAGS += $(NOSTDINC_FLAGS)
623 # warn about C99 declaration after statement
624 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
626 # disable pointer signed / unsigned warnings in gcc 4.0
627 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
629 # disable invalid "can't wrap" optimizations for signed / pointers
630 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
632 # conserve stack if available
633 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
635 # use the deterministic mode of AR if available
636 KBUILD_ARFLAGS := $(call ar-option,D)
638 # check for 'asm goto'
639 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
640 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
641 endif
643 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
644 # But warn user when we do so
645 warn-assign = \
646 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
648 ifneq ($(KCPPFLAGS),)
649 $(call warn-assign,CPPFLAGS)
650 KBUILD_CPPFLAGS += $(KCPPFLAGS)
651 endif
652 ifneq ($(KAFLAGS),)
653 $(call warn-assign,AFLAGS)
654 KBUILD_AFLAGS += $(KAFLAGS)
655 endif
656 ifneq ($(KCFLAGS),)
657 $(call warn-assign,CFLAGS)
658 KBUILD_CFLAGS += $(KCFLAGS)
659 endif
661 # Use --build-id when available.
662 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
663 $(call cc-ldoption, -Wl$(comma)--build-id,))
664 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
665 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
667 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
668 LDFLAGS_vmlinux += $(call ld-option, -X,)
669 endif
671 # Default kernel image to build when no specific target is given.
672 # KBUILD_IMAGE may be overruled on the command line or
673 # set in the environment
674 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
675 # this default value
676 export KBUILD_IMAGE ?= vmlinux
679 # INSTALL_PATH specifies where to place the updated kernel and system map
680 # images. Default is /boot, but you can set it to other values
681 export INSTALL_PATH ?= /boot
684 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
685 # relocations required by build roots. This is not defined in the
686 # makefile but the argument can be passed to make if needed.
689 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
690 export MODLIB
693 # INSTALL_MOD_STRIP, if defined, will cause modules to be
694 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
695 # the default option --strip-debug will be used. Otherwise,
696 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
698 ifdef INSTALL_MOD_STRIP
699 ifeq ($(INSTALL_MOD_STRIP),1)
700 mod_strip_cmd = $(STRIP) --strip-debug
701 else
702 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
703 endif # INSTALL_MOD_STRIP=1
704 else
705 mod_strip_cmd = true
706 endif # INSTALL_MOD_STRIP
707 export mod_strip_cmd
710 ifeq ($(KBUILD_EXTMOD),)
711 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
713 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
714 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
715 $(net-y) $(net-m) $(libs-y) $(libs-m)))
717 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
718 $(init-n) $(init-) \
719 $(core-n) $(core-) $(drivers-n) $(drivers-) \
720 $(net-n) $(net-) $(libs-n) $(libs-))))
722 init-y := $(patsubst %/, %/built-in.o, $(init-y))
723 core-y := $(patsubst %/, %/built-in.o, $(core-y))
724 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
725 net-y := $(patsubst %/, %/built-in.o, $(net-y))
726 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
727 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
728 libs-y := $(libs-y1) $(libs-y2)
730 # Build vmlinux
731 # ---------------------------------------------------------------------------
732 # vmlinux is built from the objects selected by $(vmlinux-init) and
733 # $(vmlinux-main). Most are built-in.o files from top-level directories
734 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
735 # Ordering when linking is important, and $(vmlinux-init) must be first.
737 # vmlinux
740 # +-< $(vmlinux-init)
741 # | +--< init/version.o + more
743 # +--< $(vmlinux-main)
744 # | +--< driver/built-in.o mm/built-in.o + more
746 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
748 # vmlinux version (uname -v) cannot be updated during normal
749 # descending-into-subdirs phase since we do not yet know if we need to
750 # update vmlinux.
751 # Therefore this step is delayed until just before final link of vmlinux -
752 # except in the kallsyms case where it is done just before adding the
753 # symbols to the kernel.
755 # System.map is generated to document addresses of all kernel symbols
757 vmlinux-init := $(head-y) $(init-y)
758 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
759 vmlinux-all := $(vmlinux-init) $(vmlinux-main)
760 vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
761 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
763 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
764 # May be overridden by arch/$(ARCH)/Makefile
765 quiet_cmd_vmlinux__ ?= LD $@
766 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
767 -T $(vmlinux-lds) $(vmlinux-init) \
768 --start-group $(vmlinux-main) --end-group \
769 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
771 # Generate new vmlinux version
772 quiet_cmd_vmlinux_version = GEN .version
773 cmd_vmlinux_version = set -e; \
774 if [ ! -r .version ]; then \
775 rm -f .version; \
776 echo 1 >.version; \
777 else \
778 mv .version .old_version; \
779 expr 0$$(cat .old_version) + 1 >.version; \
780 fi; \
781 $(MAKE) $(build)=init
783 # Generate System.map
784 quiet_cmd_sysmap = SYSMAP
785 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
787 # Link of vmlinux
788 # If CONFIG_KALLSYMS is set .version is already updated
789 # Generate System.map and verify that the content is consistent
790 # Use + in front of the vmlinux_version rule to silent warning with make -j2
791 # First command is ':' to allow us to use + in front of the rule
792 define rule_vmlinux__
794 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
796 $(call cmd,vmlinux__)
797 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
799 $(Q)$(if $($(quiet)cmd_sysmap), \
800 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
801 $(cmd_sysmap) $@ System.map; \
802 if [ $$? -ne 0 ]; then \
803 rm -f $@; \
804 /bin/false; \
806 $(verify_kallsyms)
807 endef
810 ifdef CONFIG_KALLSYMS
811 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
812 # It's a three stage process:
813 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
814 # empty
815 # Running kallsyms on that gives us .tmp_kallsyms1.o with
816 # the right size - vmlinux version (uname -v) is updated during this step
817 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
818 # but due to the added section, some addresses have shifted.
819 # From here, we generate a correct .tmp_kallsyms2.o
820 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
821 # o Verify that the System.map from vmlinux matches the map from
822 # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
823 # o If 'make KALLSYMS_EXTRA_PASS=1" was used, do an extra pass using
824 # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
825 # temporary bypass to allow the kernel to be built while the
826 # maintainers work out what went wrong with kallsyms.
828 last_kallsyms := 2
830 ifdef KALLSYMS_EXTRA_PASS
831 ifneq ($(KALLSYMS_EXTRA_PASS),0)
832 last_kallsyms := 3
833 endif
834 endif
836 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
838 define verify_kallsyms
839 $(Q)$(if $($(quiet)cmd_sysmap), \
840 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
841 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
842 $(Q)cmp -s System.map .tmp_System.map || \
843 (echo Inconsistent kallsyms data; \
844 echo This is a bug - please report about it; \
845 echo Try "make KALLSYMS_EXTRA_PASS=1" as a workaround; \
846 rm .tmp_kallsyms* ; /bin/false )
847 endef
849 # Update vmlinux version before link
850 # Use + in front of this rule to silent warning about make -j1
851 # First command is ':' to allow us to use + in front of this rule
852 cmd_ksym_ld = $(cmd_vmlinux__)
853 define rule_ksym_ld
855 +$(call cmd,vmlinux_version)
856 $(call cmd,vmlinux__)
857 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
858 endef
860 # Generate .S file with all kernel symbols
861 quiet_cmd_kallsyms = KSYM $@
862 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
863 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
865 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
866 $(call if_changed_dep,as_o_S)
868 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
869 $(call cmd,kallsyms)
871 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
872 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
873 $(call if_changed_rule,ksym_ld)
875 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
876 $(call if_changed,vmlinux__)
878 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
879 $(call if_changed,vmlinux__)
881 # Needs to visit scripts/ before $(KALLSYMS) can be used.
882 $(KALLSYMS): scripts ;
884 # Generate some data for debugging strange kallsyms problems
885 debug_kallsyms: .tmp_map$(last_kallsyms)
887 .tmp_map%: .tmp_vmlinux% FORCE
888 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
890 .tmp_map3: .tmp_map2
892 .tmp_map2: .tmp_map1
894 endif # ifdef CONFIG_KALLSYMS
896 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
897 # relevant sections renamed as per the linker script.
898 quiet_cmd_vmlinux-modpost = LD $@
899 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
900 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
901 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
902 define rule_vmlinux-modpost
904 +$(call cmd,vmlinux-modpost)
905 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
906 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
907 endef
909 # vmlinux image - including updated kernel symbols
910 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
911 ifdef CONFIG_HEADERS_CHECK
912 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
913 endif
914 ifdef CONFIG_SAMPLES
915 $(Q)$(MAKE) $(build)=samples
916 endif
917 ifdef CONFIG_BUILD_DOCSRC
918 $(Q)$(MAKE) $(build)=Documentation
919 endif
920 $(call vmlinux-modpost)
921 $(call if_changed_rule,vmlinux__)
922 $(Q)rm -f .old_version
924 # build vmlinux.o first to catch section mismatch errors early
925 ifdef CONFIG_KALLSYMS
926 .tmp_vmlinux1: vmlinux.o
927 endif
929 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
930 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
931 $(call if_changed_rule,vmlinux-modpost)
933 # The actual objects are generated when descending,
934 # make sure no implicit rule kicks in
935 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
937 # Handle descending into subdirectories listed in $(vmlinux-dirs)
938 # Preset locale variables to speed up the build process. Limit locale
939 # tweaks to this spot to avoid wrong language settings when running
940 # make menuconfig etc.
941 # Error messages still appears in the original language
943 PHONY += $(vmlinux-dirs)
944 $(vmlinux-dirs): prepare scripts
945 $(Q)$(MAKE) $(build)=$@
947 # Store (new) KERNELRELASE string in include/config/kernel.release
948 include/config/kernel.release: include/config/auto.conf FORCE
949 $(Q)rm -f $@
950 $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
953 # Things we need to do before we recursively start building the kernel
954 # or the modules are listed in "prepare".
955 # A multi level approach is used. prepareN is processed before prepareN-1.
956 # archprepare is used in arch Makefiles and when processed asm symlink,
957 # version.h and scripts_basic is processed / created.
959 # Listed in dependency order
960 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
962 # prepare3 is used to check if we are building in a separate output directory,
963 # and if so do:
964 # 1) Check that make has not been executed in the kernel src $(srctree)
965 prepare3: include/config/kernel.release
966 ifneq ($(KBUILD_SRC),)
967 @$(kecho) ' Using $(srctree) as source for kernel'
968 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
969 echo " $(srctree) is not clean, please run 'make mrproper'";\
970 echo " in the '$(srctree)' directory.";\
971 /bin/false; \
973 endif
975 # prepare2 creates a makefile if using a separate output directory
976 prepare2: prepare3 outputmakefile asm-generic
978 prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
979 include/config/auto.conf
980 $(cmd_crmodverdir)
982 archprepare: prepare1 scripts_basic
984 prepare0: archprepare FORCE
985 $(Q)$(MAKE) $(build)=.
986 $(Q)$(MAKE) $(build)=. missing-syscalls
988 # All the preparing..
989 prepare: prepare0
991 # Generate some files
992 # ---------------------------------------------------------------------------
994 # KERNELRELEASE can change from a few different places, meaning version.h
995 # needs to be updated, so this check is forced on all builds
997 uts_len := 64
998 define filechk_utsrelease.h
999 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1000 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1001 exit 1; \
1002 fi; \
1003 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1004 endef
1006 define filechk_version.h
1007 (echo \#define LINUX_VERSION_CODE $(shell \
1008 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1009 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1010 endef
1012 include/linux/version.h: $(srctree)/Makefile FORCE
1013 $(call filechk,version.h)
1015 include/generated/utsrelease.h: include/config/kernel.release FORCE
1016 $(call filechk,utsrelease.h)
1018 PHONY += headerdep
1019 headerdep:
1020 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1021 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1023 # ---------------------------------------------------------------------------
1025 PHONY += depend dep
1026 depend dep:
1027 @echo '*** Warning: make $@ is unnecessary now.'
1029 # ---------------------------------------------------------------------------
1030 # Firmware install
1031 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1032 export INSTALL_FW_PATH
1034 PHONY += firmware_install
1035 firmware_install: FORCE
1036 @mkdir -p $(objtree)/firmware
1037 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1039 # ---------------------------------------------------------------------------
1040 # Kernel headers
1042 #Default location for installed headers
1043 export INSTALL_HDR_PATH = $(objtree)/usr
1045 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1047 # If we do an all arch process set dst to asm-$(hdr-arch)
1048 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1050 PHONY += __headers
1051 __headers: include/linux/version.h scripts_basic asm-generic FORCE
1052 $(Q)$(MAKE) $(build)=scripts build_unifdef
1054 PHONY += headers_install_all
1055 headers_install_all:
1056 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1058 PHONY += headers_install
1059 headers_install: __headers
1060 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1061 $(error Headers not exportable for the $(SRCARCH) architecture))
1062 $(Q)$(MAKE) $(hdr-inst)=include
1063 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1065 PHONY += headers_check_all
1066 headers_check_all: headers_install_all
1067 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1069 PHONY += headers_check
1070 headers_check: headers_install
1071 $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1072 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1074 # ---------------------------------------------------------------------------
1075 # Modules
1077 ifdef CONFIG_MODULES
1079 # By default, build modules as well
1081 all: modules
1083 # Build modules
1085 # A module can be listed more than once in obj-m resulting in
1086 # duplicate lines in modules.order files. Those are removed
1087 # using awk while concatenating to the final file.
1089 PHONY += modules
1090 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1091 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1092 @$(kecho) ' Building modules, stage 2.';
1093 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1094 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1096 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1097 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1099 %/modules.builtin: include/config/auto.conf
1100 $(Q)$(MAKE) $(modbuiltin)=$*
1103 # Target to prepare building external modules
1104 PHONY += modules_prepare
1105 modules_prepare: prepare scripts
1107 # Target to install modules
1108 PHONY += modules_install
1109 modules_install: _modinst_ _modinst_post
1111 PHONY += _modinst_
1112 _modinst_:
1113 @rm -rf $(MODLIB)/kernel
1114 @rm -f $(MODLIB)/source
1115 @mkdir -p $(MODLIB)/kernel
1116 @ln -s $(srctree) $(MODLIB)/source
1117 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1118 rm -f $(MODLIB)/build ; \
1119 ln -s $(objtree) $(MODLIB)/build ; \
1121 @cp -f $(objtree)/modules.order $(MODLIB)/
1122 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1123 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1125 # This depmod is only for convenience to give the initial
1126 # boot a modules.dep even before / is mounted read-write. However the
1127 # boot script depmod is the master version.
1128 PHONY += _modinst_post
1129 _modinst_post: _modinst_
1130 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1131 $(call cmd,depmod)
1133 else # CONFIG_MODULES
1135 # Modules not configured
1136 # ---------------------------------------------------------------------------
1138 modules modules_install: FORCE
1139 @echo
1140 @echo "The present kernel configuration has modules disabled."
1141 @echo "Type 'make config' and enable loadable module support."
1142 @echo "Then build a kernel with module support enabled."
1143 @echo
1144 @exit 1
1146 endif # CONFIG_MODULES
1149 # Cleaning is done on three levels.
1150 # make clean Delete most generated files
1151 # Leave enough to build external modules
1152 # make mrproper Delete the current configuration, and all generated files
1153 # make distclean Remove editor backup files, patch leftover files and the like
1155 # Directories & files removed with 'make clean'
1156 CLEAN_DIRS += $(MODVERDIR)
1157 CLEAN_FILES += vmlinux System.map \
1158 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1160 # Directories & files removed with 'make mrproper'
1161 MRPROPER_DIRS += include/config usr/include include/generated \
1162 arch/*/include/generated
1163 MRPROPER_FILES += .config .config.old .version .old_version \
1164 include/linux/version.h \
1165 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1167 # clean - Delete most, but leave enough to build external modules
1169 clean: rm-dirs := $(CLEAN_DIRS)
1170 clean: rm-files := $(CLEAN_FILES)
1171 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation)
1173 PHONY += $(clean-dirs) clean archclean
1174 $(clean-dirs):
1175 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1177 clean: archclean
1179 # mrproper - Delete all generated files, including .config
1181 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1182 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1183 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1185 PHONY += $(mrproper-dirs) mrproper archmrproper
1186 $(mrproper-dirs):
1187 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1189 mrproper: clean archmrproper $(mrproper-dirs)
1190 $(call cmd,rmdirs)
1191 $(call cmd,rmfiles)
1193 # distclean
1195 PHONY += distclean
1197 distclean: mrproper
1198 @find $(srctree) $(RCS_FIND_IGNORE) \
1199 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1200 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1201 -o -name '.*.rej' -o -size 0 \
1202 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1203 -type f -print | xargs rm -f
1206 # Packaging of the kernel to various formats
1207 # ---------------------------------------------------------------------------
1208 # rpm target kept for backward compatibility
1209 package-dir := $(srctree)/scripts/package
1211 %src-pkg: FORCE
1212 $(Q)$(MAKE) $(build)=$(package-dir) $@
1213 %pkg: include/config/kernel.release FORCE
1214 $(Q)$(MAKE) $(build)=$(package-dir) $@
1215 rpm: include/config/kernel.release FORCE
1216 $(Q)$(MAKE) $(build)=$(package-dir) $@
1219 # Brief documentation of the typical targets used
1220 # ---------------------------------------------------------------------------
1222 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1223 boards := $(notdir $(boards))
1224 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1225 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1227 help:
1228 @echo 'Cleaning targets:'
1229 @echo ' clean - Remove most generated files but keep the config and'
1230 @echo ' enough build support to build external modules'
1231 @echo ' mrproper - Remove all generated files + config + various backup files'
1232 @echo ' distclean - mrproper + remove editor backup and patch files'
1233 @echo ''
1234 @echo 'Configuration targets:'
1235 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1236 @echo ''
1237 @echo 'Other generic targets:'
1238 @echo ' all - Build all targets marked with [*]'
1239 @echo '* vmlinux - Build the bare kernel'
1240 @echo '* modules - Build all modules'
1241 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1242 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1243 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1244 @echo ' dir/ - Build all files in dir and below'
1245 @echo ' dir/file.[oisS] - Build specified target only'
1246 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1247 @echo ' (requires a recent binutils and recent build (System.map))'
1248 @echo ' dir/file.ko - Build module including final link'
1249 @echo ' modules_prepare - Set up for building external modules'
1250 @echo ' tags/TAGS - Generate tags file for editors'
1251 @echo ' cscope - Generate cscope index'
1252 @echo ' gtags - Generate GNU GLOBAL index'
1253 @echo ' kernelrelease - Output the release version string'
1254 @echo ' kernelversion - Output the version stored in Makefile'
1255 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1256 echo ' (default: $(INSTALL_HDR_PATH))'; \
1257 echo ''
1258 @echo 'Static analysers'
1259 @echo ' checkstack - Generate a list of stack hogs'
1260 @echo ' namespacecheck - Name space analysis on compiled kernel'
1261 @echo ' versioncheck - Sanity check on version.h usage'
1262 @echo ' includecheck - Check for duplicate included header files'
1263 @echo ' export_report - List the usages of all exported symbols'
1264 @echo ' headers_check - Sanity check on exported headers'
1265 @echo ' headerdep - Detect inclusion cycles in headers'
1266 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1267 @echo ''
1268 @echo 'Kernel packaging:'
1269 @$(MAKE) $(build)=$(package-dir) help
1270 @echo ''
1271 @echo 'Documentation targets:'
1272 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1273 @echo ''
1274 @echo 'Architecture specific targets ($(SRCARCH)):'
1275 @$(if $(archhelp),$(archhelp),\
1276 echo ' No architecture specific help defined for $(SRCARCH)')
1277 @echo ''
1278 @$(if $(boards), \
1279 $(foreach b, $(boards), \
1280 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1281 echo '')
1282 @$(if $(board-dirs), \
1283 $(foreach b, $(board-dirs), \
1284 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1285 printf " %-16s - Show all of the above\\n" help-boards; \
1286 echo '')
1288 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1289 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1290 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1291 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1292 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1293 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1294 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1295 @echo ' 1: warnings which may be relevant and do not occur too often'
1296 @echo ' 2: warnings which occur quite often but may still be relevant'
1297 @echo ' 3: more obscure warnings, can most likely be ignored'
1298 @echo ' Multiple levels can be combined with W=12 or W=123'
1299 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1300 @echo ''
1301 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1302 @echo 'For further info see the ./README file'
1305 help-board-dirs := $(addprefix help-,$(board-dirs))
1307 help-boards: $(help-board-dirs)
1309 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1311 $(help-board-dirs): help-%:
1312 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1313 @$(if $(boards-per-dir), \
1314 $(foreach b, $(boards-per-dir), \
1315 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1316 echo '')
1319 # Documentation targets
1320 # ---------------------------------------------------------------------------
1321 %docs: scripts_basic FORCE
1322 $(Q)$(MAKE) $(build)=scripts build_docproc
1323 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1325 else # KBUILD_EXTMOD
1328 # External module support.
1329 # When building external modules the kernel used as basis is considered
1330 # read-only, and no consistency checks are made and the make
1331 # system is not used on the basis kernel. If updates are required
1332 # in the basis kernel ordinary make commands (without M=...) must
1333 # be used.
1335 # The following are the only valid targets when building external
1336 # modules.
1337 # make M=dir clean Delete all automatically generated files
1338 # make M=dir modules Make all modules in specified dir
1339 # make M=dir Same as 'make M=dir modules'
1340 # make M=dir modules_install
1341 # Install the modules built in the module directory
1342 # Assumes install directory is already created
1344 # We are always building modules
1345 KBUILD_MODULES := 1
1346 PHONY += crmodverdir
1347 crmodverdir:
1348 $(cmd_crmodverdir)
1350 PHONY += $(objtree)/Module.symvers
1351 $(objtree)/Module.symvers:
1352 @test -e $(objtree)/Module.symvers || ( \
1353 echo; \
1354 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1355 echo " is missing; modules will have no dependencies and modversions."; \
1356 echo )
1358 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1359 PHONY += $(module-dirs) modules
1360 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1361 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1363 modules: $(module-dirs)
1364 @$(kecho) ' Building modules, stage 2.';
1365 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1367 PHONY += modules_install
1368 modules_install: _emodinst_ _emodinst_post
1370 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1371 PHONY += _emodinst_
1372 _emodinst_:
1373 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1374 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1376 PHONY += _emodinst_post
1377 _emodinst_post: _emodinst_
1378 $(call cmd,depmod)
1380 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1382 PHONY += $(clean-dirs) clean
1383 $(clean-dirs):
1384 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1386 clean: rm-dirs := $(MODVERDIR)
1387 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1389 help:
1390 @echo ' Building external modules.'
1391 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1392 @echo ''
1393 @echo ' modules - default target, build the module(s)'
1394 @echo ' modules_install - install the module'
1395 @echo ' clean - remove generated files in module directory only'
1396 @echo ''
1398 # Dummies...
1399 PHONY += prepare scripts
1400 prepare: ;
1401 scripts: ;
1402 endif # KBUILD_EXTMOD
1404 clean: $(clean-dirs)
1405 $(call cmd,rmdirs)
1406 $(call cmd,rmfiles)
1407 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1408 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1409 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1410 -o -name '*.symtypes' -o -name 'modules.order' \
1411 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1412 -o -name '*.gcno' \) -type f -print | xargs rm -f
1414 # Generate tags for editors
1415 # ---------------------------------------------------------------------------
1416 quiet_cmd_tags = GEN $@
1417 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1419 tags TAGS cscope gtags: FORCE
1420 $(call cmd,tags)
1422 # Scripts to check various things for consistency
1423 # ---------------------------------------------------------------------------
1425 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1427 includecheck:
1428 find $(srctree)/* $(RCS_FIND_IGNORE) \
1429 -name '*.[hcS]' -type f -print | sort \
1430 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1432 versioncheck:
1433 find $(srctree)/* $(RCS_FIND_IGNORE) \
1434 -name '*.[hcS]' -type f -print | sort \
1435 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1437 coccicheck:
1438 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1440 namespacecheck:
1441 $(PERL) $(srctree)/scripts/namespace.pl
1443 export_report:
1444 $(PERL) $(srctree)/scripts/export_report.pl
1446 endif #ifeq ($(config-targets),1)
1447 endif #ifeq ($(mixed-targets),1)
1449 PHONY += checkstack kernelrelease kernelversion
1451 # UML needs a little special treatment here. It wants to use the host
1452 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1453 # else wants $(ARCH), including people doing cross-builds, which means
1454 # that $(SUBARCH) doesn't work here.
1455 ifeq ($(ARCH), um)
1456 CHECKSTACK_ARCH := $(SUBARCH)
1457 else
1458 CHECKSTACK_ARCH := $(ARCH)
1459 endif
1460 checkstack:
1461 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1462 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1464 kernelrelease:
1465 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1467 kernelversion:
1468 @echo $(KERNELVERSION)
1470 # Single targets
1471 # ---------------------------------------------------------------------------
1472 # Single targets are compatible with:
1473 # - build with mixed source and output
1474 # - build with separate output dir 'make O=...'
1475 # - external modules
1477 # target-dir => where to store outputfile
1478 # build-dir => directory in kernel source tree to use
1480 ifeq ($(KBUILD_EXTMOD),)
1481 build-dir = $(patsubst %/,%,$(dir $@))
1482 target-dir = $(dir $@)
1483 else
1484 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1485 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1486 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1487 endif
1489 %.s: %.c prepare scripts FORCE
1490 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1491 %.i: %.c prepare scripts FORCE
1492 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1493 %.o: %.c prepare scripts FORCE
1494 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1495 %.lst: %.c prepare scripts FORCE
1496 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1497 %.s: %.S prepare scripts FORCE
1498 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1499 %.o: %.S prepare scripts FORCE
1500 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1501 %.symtypes: %.c prepare scripts FORCE
1502 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1504 # Modules
1505 /: prepare scripts FORCE
1506 $(cmd_crmodverdir)
1507 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1508 $(build)=$(build-dir)
1509 %/: prepare scripts FORCE
1510 $(cmd_crmodverdir)
1511 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1512 $(build)=$(build-dir)
1513 %.ko: prepare scripts FORCE
1514 $(cmd_crmodverdir)
1515 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1516 $(build)=$(build-dir) $(@:.ko=.o)
1517 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1519 # FIXME Should go into a make.lib or something
1520 # ===========================================================================
1522 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1523 cmd_rmdirs = rm -rf $(rm-dirs)
1525 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1526 cmd_rmfiles = rm -f $(rm-files)
1528 # Run depmod only if we have System.map and depmod is executable
1529 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1530 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1531 $(KERNELRELEASE)
1533 # Create temporary dir for module support files
1534 # clean it up only when building all modules
1535 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1536 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1538 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1539 $(KBUILD_AFLAGS_KERNEL) \
1540 $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1541 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1543 quiet_cmd_as_o_S = AS $@
1544 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1546 # read all saved command lines
1548 targets := $(wildcard $(sort $(targets)))
1549 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1551 ifneq ($(cmd_files),)
1552 $(cmd_files): ; # Do not try to update included dependency files
1553 include $(cmd_files)
1554 endif
1556 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1557 # Usage:
1558 # $(Q)$(MAKE) $(clean)=dir
1559 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1561 endif # skip-makefile
1563 PHONY += FORCE
1564 FORCE:
1566 # Declare the contents of the .PHONY variable as phony. We keep that
1567 # information in a variable so we can use it in if_changed and friends.
1568 .PHONY: $(PHONY)