Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc
[cris-mirror.git] / Makefile
blob7d4e9c8da7295e628d8a7849b72e1d8651d8772c
1 VERSION = 2
2 PATCHLEVEL = 6
3 SUBLEVEL = 38
4 EXTRAVERSION =
5 NAME = Flesh-Eating Bats with Fangs
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 := 1
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 # Where to locate arch specific headers
224 hdr-arch := $(SRCARCH)
226 ifeq ($(ARCH),m68knommu)
227 hdr-arch := m68k
228 endif
230 KCONFIG_CONFIG ?= .config
231 export KCONFIG_CONFIG
233 # SHELL used by kbuild
234 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
235 else if [ -x /bin/bash ]; then echo /bin/bash; \
236 else echo sh; fi ; fi)
238 HOSTCC = gcc
239 HOSTCXX = g++
240 HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
241 HOSTCXXFLAGS = -O2
243 # Decide whether to build built-in, modular, or both.
244 # Normally, just do built-in.
246 KBUILD_MODULES :=
247 KBUILD_BUILTIN := 1
249 # If we have only "make modules", don't compile built-in objects.
250 # When we're building modules with modversions, we need to consider
251 # the built-in objects during the descend as well, in order to
252 # make sure the checksums are up to date before we record them.
254 ifeq ($(MAKECMDGOALS),modules)
255 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
256 endif
258 # If we have "make <whatever> modules", compile modules
259 # in addition to whatever we do anyway.
260 # Just "make" or "make all" shall build modules as well
262 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
263 KBUILD_MODULES := 1
264 endif
266 ifeq ($(MAKECMDGOALS),)
267 KBUILD_MODULES := 1
268 endif
270 export KBUILD_MODULES KBUILD_BUILTIN
271 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
273 # Beautify output
274 # ---------------------------------------------------------------------------
276 # Normally, we echo the whole command before executing it. By making
277 # that echo $($(quiet)$(cmd)), we now have the possibility to set
278 # $(quiet) to choose other forms of output instead, e.g.
280 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
281 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
283 # If $(quiet) is empty, the whole command will be printed.
284 # If it is set to "quiet_", only the short version will be printed.
285 # If it is set to "silent_", nothing will be printed at all, since
286 # the variable $(silent_cmd_cc_o_c) doesn't exist.
288 # A simple variant is to prefix commands with $(Q) - that's useful
289 # for commands that shall be hidden in non-verbose mode.
291 # $(Q)ln $@ :<
293 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
294 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
296 ifeq ($(KBUILD_VERBOSE),1)
297 quiet =
299 else
300 quiet=quiet_
301 Q = @
302 endif
304 # If the user is running make -s (silent mode), suppress echoing of
305 # commands
307 ifneq ($(findstring s,$(MAKEFLAGS)),)
308 quiet=silent_
309 endif
311 export quiet Q KBUILD_VERBOSE
314 # Look for make include files relative to root of kernel src
315 MAKEFLAGS += --include-dir=$(srctree)
317 # We need some generic definitions (do not try to remake the file).
318 $(srctree)/scripts/Kbuild.include: ;
319 include $(srctree)/scripts/Kbuild.include
321 # Make variables (CC, etc...)
323 AS = $(CROSS_COMPILE)as
324 LD = $(CROSS_COMPILE)ld
325 CC = $(CROSS_COMPILE)gcc
326 CPP = $(CC) -E
327 AR = $(CROSS_COMPILE)ar
328 NM = $(CROSS_COMPILE)nm
329 STRIP = $(CROSS_COMPILE)strip
330 OBJCOPY = $(CROSS_COMPILE)objcopy
331 OBJDUMP = $(CROSS_COMPILE)objdump
332 AWK = awk
333 GENKSYMS = scripts/genksyms/genksyms
334 INSTALLKERNEL := installkernel
335 DEPMOD = /sbin/depmod
336 KALLSYMS = scripts/kallsyms
337 PERL = perl
338 CHECK = sparse
340 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
341 -Wbitwise -Wno-return-void $(CF)
342 CFLAGS_MODULE =
343 AFLAGS_MODULE =
344 LDFLAGS_MODULE =
345 CFLAGS_KERNEL =
346 AFLAGS_KERNEL =
347 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
350 # Use LINUXINCLUDE when you must reference the include/ directory.
351 # Needed to be compatible with the O= option
352 LINUXINCLUDE := -I$(srctree)/arch/$(hdr-arch)/include -Iinclude \
353 $(if $(KBUILD_SRC), -I$(srctree)/include) \
354 -include include/generated/autoconf.h
356 KBUILD_CPPFLAGS := -D__KERNEL__
358 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
359 -fno-strict-aliasing -fno-common \
360 -Werror-implicit-function-declaration \
361 -Wno-format-security \
362 -fno-delete-null-pointer-checks
363 KBUILD_AFLAGS_KERNEL :=
364 KBUILD_CFLAGS_KERNEL :=
365 KBUILD_AFLAGS := -D__ASSEMBLY__
366 KBUILD_AFLAGS_MODULE := -DMODULE
367 KBUILD_CFLAGS_MODULE := -DMODULE
368 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
370 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
371 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
372 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
374 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
375 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
376 export CPP AR NM STRIP OBJCOPY OBJDUMP
377 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
378 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
380 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
381 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
382 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
383 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
384 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
386 # When compiling out-of-tree modules, put MODVERDIR in the module
387 # tree rather than in the kernel tree. The kernel tree might
388 # even be read-only.
389 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
391 # Files to ignore in find ... statements
393 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
394 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
396 # ===========================================================================
397 # Rules shared between *config targets and build targets
399 # Basic helpers built in scripts/
400 PHONY += scripts_basic
401 scripts_basic:
402 $(Q)$(MAKE) $(build)=scripts/basic
403 $(Q)rm -f .tmp_quiet_recordmcount
405 # To avoid any implicit rule to kick in, define an empty command.
406 scripts/basic/%: scripts_basic ;
408 PHONY += outputmakefile
409 # outputmakefile generates a Makefile in the output directory, if using a
410 # separate output directory. This allows convenient use of make in the
411 # output directory.
412 outputmakefile:
413 ifneq ($(KBUILD_SRC),)
414 $(Q)ln -fsn $(srctree) source
415 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
416 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
417 endif
419 # To make sure we do not include .config for any of the *config targets
420 # catch them early, and hand them over to scripts/kconfig/Makefile
421 # It is allowed to specify more targets when calling make, including
422 # mixing *config targets and build targets.
423 # For example 'make oldconfig all'.
424 # Detect when mixed targets is specified, and make a second invocation
425 # of make so .config is not included in this case either (for *config).
427 no-dot-config-targets := clean mrproper distclean \
428 cscope gtags TAGS tags help %docs check% coccicheck \
429 include/linux/version.h headers_% \
430 kernelversion %src-pkg
432 config-targets := 0
433 mixed-targets := 0
434 dot-config := 1
436 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
437 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
438 dot-config := 0
439 endif
440 endif
442 ifeq ($(KBUILD_EXTMOD),)
443 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
444 config-targets := 1
445 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
446 mixed-targets := 1
447 endif
448 endif
449 endif
451 ifeq ($(mixed-targets),1)
452 # ===========================================================================
453 # We're called with mixed targets (*config and build targets).
454 # Handle them one by one.
456 %:: FORCE
457 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
459 else
460 ifeq ($(config-targets),1)
461 # ===========================================================================
462 # *config targets only - make sure prerequisites are updated, and descend
463 # in scripts/kconfig to make the *config target
465 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
466 # KBUILD_DEFCONFIG may point out an alternative default configuration
467 # used for 'make defconfig'
468 include $(srctree)/arch/$(SRCARCH)/Makefile
469 export KBUILD_DEFCONFIG KBUILD_KCONFIG
471 config: scripts_basic outputmakefile FORCE
472 $(Q)mkdir -p include/linux include/config
473 $(Q)$(MAKE) $(build)=scripts/kconfig $@
475 %config: scripts_basic outputmakefile FORCE
476 $(Q)mkdir -p include/linux include/config
477 $(Q)$(MAKE) $(build)=scripts/kconfig $@
479 else
480 # ===========================================================================
481 # Build targets only - this includes vmlinux, arch specific targets, clean
482 # targets and others. In general all targets except *config targets.
484 ifeq ($(KBUILD_EXTMOD),)
485 # Additional helpers built in scripts/
486 # Carefully list dependencies so we do not try to build scripts twice
487 # in parallel
488 PHONY += scripts
489 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
490 $(Q)$(MAKE) $(build)=$(@)
492 # Objects we will link into vmlinux / subdirs we need to visit
493 init-y := init/
494 drivers-y := drivers/ sound/ firmware/
495 net-y := net/
496 libs-y := lib/
497 core-y := usr/
498 endif # KBUILD_EXTMOD
500 ifeq ($(dot-config),1)
501 # Read in config
502 -include include/config/auto.conf
504 ifeq ($(KBUILD_EXTMOD),)
505 # Read in dependencies to all Kconfig* files, make sure to run
506 # oldconfig if changes are detected.
507 -include include/config/auto.conf.cmd
509 # To avoid any implicit rule to kick in, define an empty command
510 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
512 # If .config is newer than include/config/auto.conf, someone tinkered
513 # with it and forgot to run make oldconfig.
514 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
515 # we execute the config step to be sure to catch updated Kconfig files
516 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
517 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
518 else
519 # external modules needs include/generated/autoconf.h and include/config/auto.conf
520 # but do not care if they are up-to-date. Use auto.conf to trigger the test
521 PHONY += include/config/auto.conf
523 include/config/auto.conf:
524 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
525 echo; \
526 echo " ERROR: Kernel configuration is invalid."; \
527 echo " include/generated/autoconf.h or $@ are missing.";\
528 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
529 echo; \
530 /bin/false)
532 endif # KBUILD_EXTMOD
534 else
535 # Dummy target needed, because used as prerequisite
536 include/config/auto.conf: ;
537 endif # $(dot-config)
539 # The all: target is the default when no target is given on the
540 # command line.
541 # This allow a user to issue only 'make' to build a kernel including modules
542 # Defaults to vmlinux, but the arch makefile usually adds further targets
543 all: vmlinux
545 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
546 KBUILD_CFLAGS += -Os
547 else
548 KBUILD_CFLAGS += -O2
549 endif
551 include $(srctree)/arch/$(SRCARCH)/Makefile
553 ifneq ($(CONFIG_FRAME_WARN),0)
554 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
555 endif
557 # Force gcc to behave correct even for buggy distributions
558 ifndef CONFIG_CC_STACKPROTECTOR
559 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
560 endif
562 ifdef CONFIG_FRAME_POINTER
563 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
564 else
565 # Some targets (ARM with Thumb2, for example), can't be built with frame
566 # pointers. For those, we don't have FUNCTION_TRACER automatically
567 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
568 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
569 # -fomit-frame-pointer with FUNCTION_TRACER.
570 ifndef CONFIG_FUNCTION_TRACER
571 KBUILD_CFLAGS += -fomit-frame-pointer
572 endif
573 endif
575 ifdef CONFIG_DEBUG_INFO
576 KBUILD_CFLAGS += -g
577 KBUILD_AFLAGS += -gdwarf-2
578 endif
580 ifdef CONFIG_DEBUG_INFO_REDUCED
581 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly)
582 endif
584 ifdef CONFIG_FUNCTION_TRACER
585 KBUILD_CFLAGS += -pg
586 ifdef CONFIG_DYNAMIC_FTRACE
587 ifdef CONFIG_HAVE_C_RECORDMCOUNT
588 BUILD_C_RECORDMCOUNT := y
589 export BUILD_C_RECORDMCOUNT
590 endif
591 endif
592 endif
594 # We trigger additional mismatches with less inlining
595 ifdef CONFIG_DEBUG_SECTION_MISMATCH
596 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
597 endif
599 # arch Makefile may override CC so keep this after arch Makefile is included
600 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
601 CHECKFLAGS += $(NOSTDINC_FLAGS)
603 # warn about C99 declaration after statement
604 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
606 # disable pointer signed / unsigned warnings in gcc 4.0
607 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
609 # disable invalid "can't wrap" optimizations for signed / pointers
610 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
612 # conserve stack if available
613 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
615 # check for 'asm goto'
616 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
617 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
618 endif
620 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
621 # But warn user when we do so
622 warn-assign = \
623 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
625 ifneq ($(KCPPFLAGS),)
626 $(call warn-assign,CPPFLAGS)
627 KBUILD_CPPFLAGS += $(KCPPFLAGS)
628 endif
629 ifneq ($(KAFLAGS),)
630 $(call warn-assign,AFLAGS)
631 KBUILD_AFLAGS += $(KAFLAGS)
632 endif
633 ifneq ($(KCFLAGS),)
634 $(call warn-assign,CFLAGS)
635 KBUILD_CFLAGS += $(KCFLAGS)
636 endif
638 # Use --build-id when available.
639 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
640 $(call cc-ldoption, -Wl$(comma)--build-id,))
641 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
642 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
644 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
645 LDFLAGS_vmlinux += $(call ld-option, -X,)
646 endif
648 # Default kernel image to build when no specific target is given.
649 # KBUILD_IMAGE may be overruled on the command line or
650 # set in the environment
651 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
652 # this default value
653 export KBUILD_IMAGE ?= vmlinux
656 # INSTALL_PATH specifies where to place the updated kernel and system map
657 # images. Default is /boot, but you can set it to other values
658 export INSTALL_PATH ?= /boot
661 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
662 # relocations required by build roots. This is not defined in the
663 # makefile but the argument can be passed to make if needed.
666 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
667 export MODLIB
670 # INSTALL_MOD_STRIP, if defined, will cause modules to be
671 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
672 # the default option --strip-debug will be used. Otherwise,
673 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
675 ifdef INSTALL_MOD_STRIP
676 ifeq ($(INSTALL_MOD_STRIP),1)
677 mod_strip_cmd = $(STRIP) --strip-debug
678 else
679 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
680 endif # INSTALL_MOD_STRIP=1
681 else
682 mod_strip_cmd = true
683 endif # INSTALL_MOD_STRIP
684 export mod_strip_cmd
687 ifeq ($(KBUILD_EXTMOD),)
688 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
690 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
691 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
692 $(net-y) $(net-m) $(libs-y) $(libs-m)))
694 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
695 $(init-n) $(init-) \
696 $(core-n) $(core-) $(drivers-n) $(drivers-) \
697 $(net-n) $(net-) $(libs-n) $(libs-))))
699 init-y := $(patsubst %/, %/built-in.o, $(init-y))
700 core-y := $(patsubst %/, %/built-in.o, $(core-y))
701 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
702 net-y := $(patsubst %/, %/built-in.o, $(net-y))
703 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
704 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
705 libs-y := $(libs-y1) $(libs-y2)
707 # Build vmlinux
708 # ---------------------------------------------------------------------------
709 # vmlinux is built from the objects selected by $(vmlinux-init) and
710 # $(vmlinux-main). Most are built-in.o files from top-level directories
711 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
712 # Ordering when linking is important, and $(vmlinux-init) must be first.
714 # vmlinux
717 # +-< $(vmlinux-init)
718 # | +--< init/version.o + more
720 # +--< $(vmlinux-main)
721 # | +--< driver/built-in.o mm/built-in.o + more
723 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
725 # vmlinux version (uname -v) cannot be updated during normal
726 # descending-into-subdirs phase since we do not yet know if we need to
727 # update vmlinux.
728 # Therefore this step is delayed until just before final link of vmlinux -
729 # except in the kallsyms case where it is done just before adding the
730 # symbols to the kernel.
732 # System.map is generated to document addresses of all kernel symbols
734 vmlinux-init := $(head-y) $(init-y)
735 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
736 vmlinux-all := $(vmlinux-init) $(vmlinux-main)
737 vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
738 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
740 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
741 # May be overridden by arch/$(ARCH)/Makefile
742 quiet_cmd_vmlinux__ ?= LD $@
743 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
744 -T $(vmlinux-lds) $(vmlinux-init) \
745 --start-group $(vmlinux-main) --end-group \
746 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
748 # Generate new vmlinux version
749 quiet_cmd_vmlinux_version = GEN .version
750 cmd_vmlinux_version = set -e; \
751 if [ ! -r .version ]; then \
752 rm -f .version; \
753 echo 1 >.version; \
754 else \
755 mv .version .old_version; \
756 expr 0$$(cat .old_version) + 1 >.version; \
757 fi; \
758 $(MAKE) $(build)=init
760 # Generate System.map
761 quiet_cmd_sysmap = SYSMAP
762 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
764 # Link of vmlinux
765 # If CONFIG_KALLSYMS is set .version is already updated
766 # Generate System.map and verify that the content is consistent
767 # Use + in front of the vmlinux_version rule to silent warning with make -j2
768 # First command is ':' to allow us to use + in front of the rule
769 define rule_vmlinux__
771 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
773 $(call cmd,vmlinux__)
774 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
776 $(Q)$(if $($(quiet)cmd_sysmap), \
777 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
778 $(cmd_sysmap) $@ System.map; \
779 if [ $$? -ne 0 ]; then \
780 rm -f $@; \
781 /bin/false; \
783 $(verify_kallsyms)
784 endef
787 ifdef CONFIG_KALLSYMS
788 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
789 # It's a three stage process:
790 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
791 # empty
792 # Running kallsyms on that gives us .tmp_kallsyms1.o with
793 # the right size - vmlinux version (uname -v) is updated during this step
794 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
795 # but due to the added section, some addresses have shifted.
796 # From here, we generate a correct .tmp_kallsyms2.o
797 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
798 # o Verify that the System.map from vmlinux matches the map from
799 # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
800 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
801 # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
802 # temporary bypass to allow the kernel to be built while the
803 # maintainers work out what went wrong with kallsyms.
805 ifdef CONFIG_KALLSYMS_EXTRA_PASS
806 last_kallsyms := 3
807 else
808 last_kallsyms := 2
809 endif
811 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
813 define verify_kallsyms
814 $(Q)$(if $($(quiet)cmd_sysmap), \
815 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
816 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
817 $(Q)cmp -s System.map .tmp_System.map || \
818 (echo Inconsistent kallsyms data; \
819 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
820 rm .tmp_kallsyms* ; /bin/false )
821 endef
823 # Update vmlinux version before link
824 # Use + in front of this rule to silent warning about make -j1
825 # First command is ':' to allow us to use + in front of this rule
826 cmd_ksym_ld = $(cmd_vmlinux__)
827 define rule_ksym_ld
829 +$(call cmd,vmlinux_version)
830 $(call cmd,vmlinux__)
831 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
832 endef
834 # Generate .S file with all kernel symbols
835 quiet_cmd_kallsyms = KSYM $@
836 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
837 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
839 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
840 $(call if_changed_dep,as_o_S)
842 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
843 $(call cmd,kallsyms)
845 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
846 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
847 $(call if_changed_rule,ksym_ld)
849 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
850 $(call if_changed,vmlinux__)
852 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
853 $(call if_changed,vmlinux__)
855 # Needs to visit scripts/ before $(KALLSYMS) can be used.
856 $(KALLSYMS): scripts ;
858 # Generate some data for debugging strange kallsyms problems
859 debug_kallsyms: .tmp_map$(last_kallsyms)
861 .tmp_map%: .tmp_vmlinux% FORCE
862 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
864 .tmp_map3: .tmp_map2
866 .tmp_map2: .tmp_map1
868 endif # ifdef CONFIG_KALLSYMS
870 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
871 # relevant sections renamed as per the linker script.
872 quiet_cmd_vmlinux-modpost = LD $@
873 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
874 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
875 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
876 define rule_vmlinux-modpost
878 +$(call cmd,vmlinux-modpost)
879 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
880 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
881 endef
883 # vmlinux image - including updated kernel symbols
884 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
885 ifdef CONFIG_HEADERS_CHECK
886 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
887 endif
888 ifdef CONFIG_SAMPLES
889 $(Q)$(MAKE) $(build)=samples
890 endif
891 ifdef CONFIG_BUILD_DOCSRC
892 $(Q)$(MAKE) $(build)=Documentation
893 endif
894 $(call vmlinux-modpost)
895 $(call if_changed_rule,vmlinux__)
896 $(Q)rm -f .old_version
898 # build vmlinux.o first to catch section mismatch errors early
899 ifdef CONFIG_KALLSYMS
900 .tmp_vmlinux1: vmlinux.o
901 endif
903 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
904 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
905 $(call if_changed_rule,vmlinux-modpost)
907 # The actual objects are generated when descending,
908 # make sure no implicit rule kicks in
909 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
911 # Handle descending into subdirectories listed in $(vmlinux-dirs)
912 # Preset locale variables to speed up the build process. Limit locale
913 # tweaks to this spot to avoid wrong language settings when running
914 # make menuconfig etc.
915 # Error messages still appears in the original language
917 PHONY += $(vmlinux-dirs)
918 $(vmlinux-dirs): prepare scripts
919 $(Q)$(MAKE) $(build)=$@
921 # Store (new) KERNELRELASE string in include/config/kernel.release
922 include/config/kernel.release: include/config/auto.conf FORCE
923 $(Q)rm -f $@
924 $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
927 # Things we need to do before we recursively start building the kernel
928 # or the modules are listed in "prepare".
929 # A multi level approach is used. prepareN is processed before prepareN-1.
930 # archprepare is used in arch Makefiles and when processed asm symlink,
931 # version.h and scripts_basic is processed / created.
933 # Listed in dependency order
934 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
936 # prepare3 is used to check if we are building in a separate output directory,
937 # and if so do:
938 # 1) Check that make has not been executed in the kernel src $(srctree)
939 prepare3: include/config/kernel.release
940 ifneq ($(KBUILD_SRC),)
941 @$(kecho) ' Using $(srctree) as source for kernel'
942 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
943 echo " $(srctree) is not clean, please run 'make mrproper'";\
944 echo " in the '$(srctree)' directory.";\
945 /bin/false; \
947 endif
949 # prepare2 creates a makefile if using a separate output directory
950 prepare2: prepare3 outputmakefile
952 prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
953 include/config/auto.conf
954 $(cmd_crmodverdir)
956 archprepare: prepare1 scripts_basic
958 prepare0: archprepare FORCE
959 $(Q)$(MAKE) $(build)=.
960 $(Q)$(MAKE) $(build)=. missing-syscalls
962 # All the preparing..
963 prepare: prepare0
965 # Generate some files
966 # ---------------------------------------------------------------------------
968 # KERNELRELEASE can change from a few different places, meaning version.h
969 # needs to be updated, so this check is forced on all builds
971 uts_len := 64
972 define filechk_utsrelease.h
973 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
974 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
975 exit 1; \
976 fi; \
977 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
978 endef
980 define filechk_version.h
981 (echo \#define LINUX_VERSION_CODE $(shell \
982 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
983 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
984 endef
986 include/linux/version.h: $(srctree)/Makefile FORCE
987 $(call filechk,version.h)
989 include/generated/utsrelease.h: include/config/kernel.release FORCE
990 $(call filechk,utsrelease.h)
992 PHONY += headerdep
993 headerdep:
994 $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
996 # ---------------------------------------------------------------------------
998 PHONY += depend dep
999 depend dep:
1000 @echo '*** Warning: make $@ is unnecessary now.'
1002 # ---------------------------------------------------------------------------
1003 # Firmware install
1004 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1005 export INSTALL_FW_PATH
1007 PHONY += firmware_install
1008 firmware_install: FORCE
1009 @mkdir -p $(objtree)/firmware
1010 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1012 # ---------------------------------------------------------------------------
1013 # Kernel headers
1015 #Default location for installed headers
1016 export INSTALL_HDR_PATH = $(objtree)/usr
1018 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1020 # If we do an all arch process set dst to asm-$(hdr-arch)
1021 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1023 PHONY += __headers
1024 __headers: include/linux/version.h scripts_basic FORCE
1025 $(Q)$(MAKE) $(build)=scripts build_unifdef
1027 PHONY += headers_install_all
1028 headers_install_all:
1029 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1031 PHONY += headers_install
1032 headers_install: __headers
1033 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1034 $(error Headers not exportable for the $(SRCARCH) architecture))
1035 $(Q)$(MAKE) $(hdr-inst)=include
1036 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1038 PHONY += headers_check_all
1039 headers_check_all: headers_install_all
1040 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1042 PHONY += headers_check
1043 headers_check: headers_install
1044 $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1045 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1047 # ---------------------------------------------------------------------------
1048 # Modules
1050 ifdef CONFIG_MODULES
1052 # By default, build modules as well
1054 all: modules
1056 # Build modules
1058 # A module can be listed more than once in obj-m resulting in
1059 # duplicate lines in modules.order files. Those are removed
1060 # using awk while concatenating to the final file.
1062 PHONY += modules
1063 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1064 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1065 @$(kecho) ' Building modules, stage 2.';
1066 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1067 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1069 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1070 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1072 %/modules.builtin: include/config/auto.conf
1073 $(Q)$(MAKE) $(modbuiltin)=$*
1076 # Target to prepare building external modules
1077 PHONY += modules_prepare
1078 modules_prepare: prepare scripts
1080 # Target to install modules
1081 PHONY += modules_install
1082 modules_install: _modinst_ _modinst_post
1084 PHONY += _modinst_
1085 _modinst_:
1086 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1087 echo "Warning: you may need to install module-init-tools"; \
1088 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1089 sleep 1; \
1091 @rm -rf $(MODLIB)/kernel
1092 @rm -f $(MODLIB)/source
1093 @mkdir -p $(MODLIB)/kernel
1094 @ln -s $(srctree) $(MODLIB)/source
1095 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1096 rm -f $(MODLIB)/build ; \
1097 ln -s $(objtree) $(MODLIB)/build ; \
1099 @cp -f $(objtree)/modules.order $(MODLIB)/
1100 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1101 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1103 # This depmod is only for convenience to give the initial
1104 # boot a modules.dep even before / is mounted read-write. However the
1105 # boot script depmod is the master version.
1106 PHONY += _modinst_post
1107 _modinst_post: _modinst_
1108 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1109 $(call cmd,depmod)
1111 else # CONFIG_MODULES
1113 # Modules not configured
1114 # ---------------------------------------------------------------------------
1116 modules modules_install: FORCE
1117 @echo
1118 @echo "The present kernel configuration has modules disabled."
1119 @echo "Type 'make config' and enable loadable module support."
1120 @echo "Then build a kernel with module support enabled."
1121 @echo
1122 @exit 1
1124 endif # CONFIG_MODULES
1127 # Cleaning is done on three levels.
1128 # make clean Delete most generated files
1129 # Leave enough to build external modules
1130 # make mrproper Delete the current configuration, and all generated files
1131 # make distclean Remove editor backup files, patch leftover files and the like
1133 # Directories & files removed with 'make clean'
1134 CLEAN_DIRS += $(MODVERDIR)
1135 CLEAN_FILES += vmlinux System.map \
1136 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1138 # Directories & files removed with 'make mrproper'
1139 MRPROPER_DIRS += include/config usr/include include/generated
1140 MRPROPER_FILES += .config .config.old .version .old_version \
1141 include/linux/version.h \
1142 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1144 # clean - Delete most, but leave enough to build external modules
1146 clean: rm-dirs := $(CLEAN_DIRS)
1147 clean: rm-files := $(CLEAN_FILES)
1148 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation)
1150 PHONY += $(clean-dirs) clean archclean
1151 $(clean-dirs):
1152 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1154 clean: archclean
1156 # mrproper - Delete all generated files, including .config
1158 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1159 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1160 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1162 PHONY += $(mrproper-dirs) mrproper archmrproper
1163 $(mrproper-dirs):
1164 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1166 mrproper: clean archmrproper $(mrproper-dirs)
1167 $(call cmd,rmdirs)
1168 $(call cmd,rmfiles)
1170 # distclean
1172 PHONY += distclean
1174 distclean: mrproper
1175 @find $(srctree) $(RCS_FIND_IGNORE) \
1176 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1177 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1178 -o -name '.*.rej' -o -size 0 \
1179 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1180 -type f -print | xargs rm -f
1183 # Packaging of the kernel to various formats
1184 # ---------------------------------------------------------------------------
1185 # rpm target kept for backward compatibility
1186 package-dir := $(srctree)/scripts/package
1188 %src-pkg: FORCE
1189 $(Q)$(MAKE) $(build)=$(package-dir) $@
1190 %pkg: include/config/kernel.release FORCE
1191 $(Q)$(MAKE) $(build)=$(package-dir) $@
1192 rpm: include/config/kernel.release FORCE
1193 $(Q)$(MAKE) $(build)=$(package-dir) $@
1196 # Brief documentation of the typical targets used
1197 # ---------------------------------------------------------------------------
1199 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1200 boards := $(notdir $(boards))
1201 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1202 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1204 help:
1205 @echo 'Cleaning targets:'
1206 @echo ' clean - Remove most generated files but keep the config and'
1207 @echo ' enough build support to build external modules'
1208 @echo ' mrproper - Remove all generated files + config + various backup files'
1209 @echo ' distclean - mrproper + remove editor backup and patch files'
1210 @echo ''
1211 @echo 'Configuration targets:'
1212 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1213 @echo ''
1214 @echo 'Other generic targets:'
1215 @echo ' all - Build all targets marked with [*]'
1216 @echo '* vmlinux - Build the bare kernel'
1217 @echo '* modules - Build all modules'
1218 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1219 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1220 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1221 @echo ' dir/ - Build all files in dir and below'
1222 @echo ' dir/file.[oisS] - Build specified target only'
1223 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1224 @echo ' (requires a recent binutils and recent build (System.map))'
1225 @echo ' dir/file.ko - Build module including final link'
1226 @echo ' modules_prepare - Set up for building external modules'
1227 @echo ' tags/TAGS - Generate tags file for editors'
1228 @echo ' cscope - Generate cscope index'
1229 @echo ' gtags - Generate GNU GLOBAL index'
1230 @echo ' kernelrelease - Output the release version string'
1231 @echo ' kernelversion - Output the version stored in Makefile'
1232 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1233 echo ' (default: $(INSTALL_HDR_PATH))'; \
1234 echo ''
1235 @echo 'Static analysers'
1236 @echo ' checkstack - Generate a list of stack hogs'
1237 @echo ' namespacecheck - Name space analysis on compiled kernel'
1238 @echo ' versioncheck - Sanity check on version.h usage'
1239 @echo ' includecheck - Check for duplicate included header files'
1240 @echo ' export_report - List the usages of all exported symbols'
1241 @echo ' headers_check - Sanity check on exported headers'
1242 @echo ' headerdep - Detect inclusion cycles in headers'
1243 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1244 @echo ''
1245 @echo 'Kernel packaging:'
1246 @$(MAKE) $(build)=$(package-dir) help
1247 @echo ''
1248 @echo 'Documentation targets:'
1249 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1250 @echo ''
1251 @echo 'Architecture specific targets ($(SRCARCH)):'
1252 @$(if $(archhelp),$(archhelp),\
1253 echo ' No architecture specific help defined for $(SRCARCH)')
1254 @echo ''
1255 @$(if $(boards), \
1256 $(foreach b, $(boards), \
1257 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1258 echo '')
1259 @$(if $(board-dirs), \
1260 $(foreach b, $(board-dirs), \
1261 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1262 printf " %-16s - Show all of the above\\n" help-boards; \
1263 echo '')
1265 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1266 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1267 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1268 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1269 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1270 @echo ' make W=1 [targets] Enable extra gcc checks'
1271 @echo ''
1272 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1273 @echo 'For further info see the ./README file'
1276 help-board-dirs := $(addprefix help-,$(board-dirs))
1278 help-boards: $(help-board-dirs)
1280 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1282 $(help-board-dirs): help-%:
1283 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1284 @$(if $(boards-per-dir), \
1285 $(foreach b, $(boards-per-dir), \
1286 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1287 echo '')
1290 # Documentation targets
1291 # ---------------------------------------------------------------------------
1292 %docs: scripts_basic FORCE
1293 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1295 else # KBUILD_EXTMOD
1298 # External module support.
1299 # When building external modules the kernel used as basis is considered
1300 # read-only, and no consistency checks are made and the make
1301 # system is not used on the basis kernel. If updates are required
1302 # in the basis kernel ordinary make commands (without M=...) must
1303 # be used.
1305 # The following are the only valid targets when building external
1306 # modules.
1307 # make M=dir clean Delete all automatically generated files
1308 # make M=dir modules Make all modules in specified dir
1309 # make M=dir Same as 'make M=dir modules'
1310 # make M=dir modules_install
1311 # Install the modules built in the module directory
1312 # Assumes install directory is already created
1314 # We are always building modules
1315 KBUILD_MODULES := 1
1316 PHONY += crmodverdir
1317 crmodverdir:
1318 $(cmd_crmodverdir)
1320 PHONY += $(objtree)/Module.symvers
1321 $(objtree)/Module.symvers:
1322 @test -e $(objtree)/Module.symvers || ( \
1323 echo; \
1324 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1325 echo " is missing; modules will have no dependencies and modversions."; \
1326 echo )
1328 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1329 PHONY += $(module-dirs) modules
1330 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1331 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1333 modules: $(module-dirs)
1334 @$(kecho) ' Building modules, stage 2.';
1335 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1337 PHONY += modules_install
1338 modules_install: _emodinst_ _emodinst_post
1340 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1341 PHONY += _emodinst_
1342 _emodinst_:
1343 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1344 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1346 PHONY += _emodinst_post
1347 _emodinst_post: _emodinst_
1348 $(call cmd,depmod)
1350 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1352 PHONY += $(clean-dirs) clean
1353 $(clean-dirs):
1354 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1356 clean: rm-dirs := $(MODVERDIR)
1357 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1359 help:
1360 @echo ' Building external modules.'
1361 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1362 @echo ''
1363 @echo ' modules - default target, build the module(s)'
1364 @echo ' modules_install - install the module'
1365 @echo ' clean - remove generated files in module directory only'
1366 @echo ''
1368 # Dummies...
1369 PHONY += prepare scripts
1370 prepare: ;
1371 scripts: ;
1372 endif # KBUILD_EXTMOD
1374 clean: $(clean-dirs)
1375 $(call cmd,rmdirs)
1376 $(call cmd,rmfiles)
1377 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1378 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1379 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1380 -o -name '*.symtypes' -o -name 'modules.order' \
1381 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1382 -o -name '*.gcno' \) -type f -print | xargs rm -f
1384 # Generate tags for editors
1385 # ---------------------------------------------------------------------------
1386 quiet_cmd_tags = GEN $@
1387 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1389 tags TAGS cscope gtags: FORCE
1390 $(call cmd,tags)
1392 # Scripts to check various things for consistency
1393 # ---------------------------------------------------------------------------
1395 includecheck:
1396 find * $(RCS_FIND_IGNORE) \
1397 -name '*.[hcS]' -type f -print | sort \
1398 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1400 versioncheck:
1401 find * $(RCS_FIND_IGNORE) \
1402 -name '*.[hcS]' -type f -print | sort \
1403 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1405 coccicheck:
1406 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1408 namespacecheck:
1409 $(PERL) $(srctree)/scripts/namespace.pl
1411 export_report:
1412 $(PERL) $(srctree)/scripts/export_report.pl
1414 endif #ifeq ($(config-targets),1)
1415 endif #ifeq ($(mixed-targets),1)
1417 PHONY += checkstack kernelrelease kernelversion
1419 # UML needs a little special treatment here. It wants to use the host
1420 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1421 # else wants $(ARCH), including people doing cross-builds, which means
1422 # that $(SUBARCH) doesn't work here.
1423 ifeq ($(ARCH), um)
1424 CHECKSTACK_ARCH := $(SUBARCH)
1425 else
1426 CHECKSTACK_ARCH := $(ARCH)
1427 endif
1428 checkstack:
1429 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1430 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1432 kernelrelease:
1433 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1435 kernelversion:
1436 @echo $(KERNELVERSION)
1438 # Single targets
1439 # ---------------------------------------------------------------------------
1440 # Single targets are compatible with:
1441 # - build with mixed source and output
1442 # - build with separate output dir 'make O=...'
1443 # - external modules
1445 # target-dir => where to store outputfile
1446 # build-dir => directory in kernel source tree to use
1448 ifeq ($(KBUILD_EXTMOD),)
1449 build-dir = $(patsubst %/,%,$(dir $@))
1450 target-dir = $(dir $@)
1451 else
1452 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1453 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1454 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1455 endif
1457 %.s: %.c prepare scripts FORCE
1458 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1459 %.i: %.c prepare scripts FORCE
1460 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1461 %.o: %.c prepare scripts FORCE
1462 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1463 %.lst: %.c prepare scripts FORCE
1464 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1465 %.s: %.S prepare scripts FORCE
1466 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1467 %.o: %.S prepare scripts FORCE
1468 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1469 %.symtypes: %.c prepare scripts FORCE
1470 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1472 # Modules
1473 /: prepare scripts FORCE
1474 $(cmd_crmodverdir)
1475 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1476 $(build)=$(build-dir)
1477 %/: prepare scripts FORCE
1478 $(cmd_crmodverdir)
1479 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1480 $(build)=$(build-dir)
1481 %.ko: prepare scripts FORCE
1482 $(cmd_crmodverdir)
1483 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1484 $(build)=$(build-dir) $(@:.ko=.o)
1485 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1487 # FIXME Should go into a make.lib or something
1488 # ===========================================================================
1490 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1491 cmd_rmdirs = rm -rf $(rm-dirs)
1493 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1494 cmd_rmfiles = rm -f $(rm-files)
1496 # Run depmod only if we have System.map and depmod is executable
1497 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1498 cmd_depmod = \
1499 if [ -r System.map -a -x $(DEPMOD) ]; then \
1500 $(DEPMOD) -ae -F System.map \
1501 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) ) \
1502 $(KERNELRELEASE); \
1505 # Create temporary dir for module support files
1506 # clean it up only when building all modules
1507 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1508 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1510 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1511 $(KBUILD_AFLAGS_KERNEL) \
1512 $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1513 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1515 quiet_cmd_as_o_S = AS $@
1516 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1518 # read all saved command lines
1520 targets := $(wildcard $(sort $(targets)))
1521 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1523 ifneq ($(cmd_files),)
1524 $(cmd_files): ; # Do not try to update included dependency files
1525 include $(cmd_files)
1526 endif
1528 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1529 # Usage:
1530 # $(Q)$(MAKE) $(clean)=dir
1531 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1533 endif # skip-makefile
1535 PHONY += FORCE
1536 FORCE:
1538 # Declare the contents of the .PHONY variable as phony. We keep that
1539 # information in a variable so we can use it in if_changed and friends.
1540 .PHONY: $(PHONY)