5 NAME = Shuffling Zombie Juror
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.
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
23 export LC_COLLATE LC_NUMERIC
25 # Avoid interference with shell env settings
28 # We are using a recursive build, so we need to do a little thinking
29 # to get the ordering right.
31 # Most importantly: sub-Makefiles should only ever modify files in
32 # their own directory. If in some directory we have a dependency on
33 # a file in another dir (which doesn't happen often, but it's often
34 # unavoidable when linking the built-in.o targets which finally
35 # turn into vmlinux), we will call a sub make in that other dir, and
36 # after that we are sure that everything which is in that other dir
39 # The only cases where we need to modify files which have global
40 # effects are thus separated out and done before the recursive
41 # descending is started. They are now explicitly listed as the
44 # To put more focus on warnings, be less verbose as default
45 # Use 'make V=1' to see the full commands
47 ifeq ("$(origin V)", "command line")
54 # Call a source code checker (by default, "sparse") as part of the
57 # Use 'make C=1' to enable checking of only re-compiled files.
58 # Use 'make C=2' to enable checking of *all* source files, regardless
59 # of whether they are re-compiled or not.
61 # See the file "Documentation/sparse.txt" for more details, including
62 # where to get the "sparse" utility.
64 ifeq ("$(origin C)", "command line")
65 KBUILD_CHECKSRC = $(C)
67 ifndef KBUILD_CHECKSRC
71 # Use make M=dir to specify directory of external module to build
72 # Old syntax make ... SUBDIRS=$PWD is still supported
73 # Setting the environment variable KBUILD_EXTMOD take precedence
75 KBUILD_EXTMOD ?= $(SUBDIRS)
78 ifeq ("$(origin M)", "command line")
82 # kbuild supports saving output files in a separate directory.
83 # To locate output files in a separate directory two syntaxes are supported.
84 # In both cases the working directory must be the root of the kernel src.
86 # Use "make O=dir/to/store/output/files/"
88 # 2) Set KBUILD_OUTPUT
89 # Set the environment variable KBUILD_OUTPUT to point to the directory
90 # where the output files shall be placed.
91 # export KBUILD_OUTPUT=dir/to/store/output/files/
94 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
98 # KBUILD_SRC is set on invocation of make in OBJ directory
99 # KBUILD_SRC is not intended to be used by the regular user (for now)
100 ifeq ($(KBUILD_SRC),)
102 # OK, Make called in directory where kernel src resides
103 # Do we want to locate output files in a separate directory?
104 ifeq ("$(origin O)", "command line")
105 KBUILD_OUTPUT := $(O)
108 # That's our default target when none is given on the command line
112 # Cancel implicit rules on top Makefile
113 $(CURDIR)/Makefile Makefile: ;
115 ifneq ($(KBUILD_OUTPUT),)
116 # Invoke a second make in the output directory, passing relevant variables
117 # check that the output directory actually exists
118 saved-output := $(KBUILD_OUTPUT)
119 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
121 $(if $(KBUILD_OUTPUT),, \
122 $(error failed to create output directory "$(saved-output)"))
124 PHONY += $(MAKECMDGOALS) sub-make
126 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
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
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 ($(skip-makefile),)
143 # If building an external module we do not care about the all: rule
144 # but instead _all depend on modules
146 ifeq ($(KBUILD_EXTMOD),)
152 ifeq ($(KBUILD_SRC),)
153 # building in the source tree
156 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
157 # building in a subdirectory of the source tree
160 srctree := $(KBUILD_SRC)
167 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
169 export srctree objtree VPATH
172 # SUBARCH tells the usermode build what the underlying arch is. That is set
173 # first, and if a usermode build is happening, the "ARCH=um" on the command
174 # line overrides the setting of ARCH below. If a native build is happening,
175 # then ARCH is assigned, getting whatever value it gets normally, and
176 # SUBARCH is subsequently ignored.
178 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
179 -e s/sun4u/sparc64/ \
180 -e s/arm.*/arm/ -e s/sa110/arm/ \
181 -e s/s390x/s390/ -e s/parisc64/parisc/ \
182 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
183 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
185 # Cross compiling and selecting different set of gcc/bin-utils
186 # ---------------------------------------------------------------------------
188 # When performing cross compilation for other architectures ARCH shall be set
189 # to the target architecture. (See arch/* for the possibilities).
190 # ARCH can be set during invocation of make:
192 # Another way is to have ARCH set in the environment.
193 # The default ARCH is the host where make is executed.
195 # CROSS_COMPILE specify the prefix used for all executables used
196 # during compilation. Only gcc and related bin-utils executables
197 # are prefixed with $(CROSS_COMPILE).
198 # CROSS_COMPILE can be set on the command line
199 # make CROSS_COMPILE=ia64-linux-
200 # Alternatively CROSS_COMPILE can be set in the environment.
201 # A third alternative is to store a setting in .config so that plain
202 # "make" in the configured kernel build directory always uses that.
203 # Default value for CROSS_COMPILE is not to prefix executables
204 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
206 CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
208 # Architecture as present in compile.h
209 UTS_MACHINE := $(ARCH)
212 # Additional ARCH settings for x86
216 ifeq ($(ARCH),x86_64)
220 # Additional ARCH settings for sparc
221 ifeq ($(ARCH),sparc32)
224 ifeq ($(ARCH),sparc64)
228 # Additional ARCH settings for sh
233 # Additional ARCH settings for tile
234 ifeq ($(ARCH),tilepro)
237 ifeq ($(ARCH),tilegx)
241 # Where to locate arch specific headers
242 hdr-arch := $(SRCARCH)
244 KCONFIG_CONFIG ?= .config
245 export KCONFIG_CONFIG
247 # SHELL used by kbuild
248 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
249 else if [ -x /bin/bash ]; then echo /bin/bash; \
250 else echo sh; fi ; fi)
254 HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
257 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
258 HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
259 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
262 # Decide whether to build built-in, modular, or both.
263 # Normally, just do built-in.
268 # If we have only "make modules", don't compile built-in objects.
269 # When we're building modules with modversions, we need to consider
270 # the built-in objects during the descend as well, in order to
271 # make sure the checksums are up to date before we record them.
273 ifeq ($(MAKECMDGOALS),modules)
274 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
277 # If we have "make <whatever> modules", compile modules
278 # in addition to whatever we do anyway.
279 # Just "make" or "make all" shall build modules as well
281 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
285 ifeq ($(MAKECMDGOALS),)
289 export KBUILD_MODULES KBUILD_BUILTIN
290 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
293 # ---------------------------------------------------------------------------
295 # Normally, we echo the whole command before executing it. By making
296 # that echo $($(quiet)$(cmd)), we now have the possibility to set
297 # $(quiet) to choose other forms of output instead, e.g.
299 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
300 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
302 # If $(quiet) is empty, the whole command will be printed.
303 # If it is set to "quiet_", only the short version will be printed.
304 # If it is set to "silent_", nothing will be printed at all, since
305 # the variable $(silent_cmd_cc_o_c) doesn't exist.
307 # A simple variant is to prefix commands with $(Q) - that's useful
308 # for commands that shall be hidden in non-verbose mode.
312 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
313 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
315 ifeq ($(KBUILD_VERBOSE),1)
323 # If the user is running make -s (silent mode), suppress echoing of
326 ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
327 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
331 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
336 export quiet Q KBUILD_VERBOSE
339 ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1)
347 # Look for make include files relative to root of kernel src
348 MAKEFLAGS += --include-dir=$(srctree)
350 # We need some generic definitions (do not try to remake the file).
351 $(srctree)/scripts/Kbuild.include: ;
352 include $(srctree)/scripts/Kbuild.include
354 # Make variables (CC, etc...)
355 AS = $(CROSS_COMPILE)as
356 LD = $(CROSS_COMPILE)ld
358 CC = $(CROSS_COMPILE)gcc
361 AR = $(CROSS_COMPILE)gcc-ar
363 AR = $(CROSS_COMPILE)ar
365 NM = $(CROSS_COMPILE)nm
366 STRIP = $(CROSS_COMPILE)strip
367 OBJCOPY = $(CROSS_COMPILE)objcopy
368 OBJDUMP = $(CROSS_COMPILE)objdump
370 GENKSYMS = scripts/genksyms/genksyms
371 INSTALLKERNEL := installkernel
372 DEPMOD = /sbin/depmod
376 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
377 -Wbitwise -Wno-return-void $(CF)
383 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
386 # Use USERINCLUDE when you must reference the UAPI directories only.
388 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
389 -Iarch/$(hdr-arch)/include/generated/uapi \
390 -I$(srctree)/include/uapi \
391 -Iinclude/generated/uapi \
392 -include $(srctree)/include/linux/kconfig.h
394 # Use LINUXINCLUDE when you must reference the include/ directory.
395 # Needed to be compatible with the O= option
397 -I$(srctree)/arch/$(hdr-arch)/include \
398 -Iarch/$(hdr-arch)/include/generated \
399 $(if $(KBUILD_SRC), -I$(srctree)/include) \
403 KBUILD_CPPFLAGS := -D__KERNEL__
405 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
406 -fno-strict-aliasing -fno-common \
407 -Werror-implicit-function-declaration \
408 -Wno-format-security \
409 $(call cc-option,-fno-delete-null-pointer-checks,)
410 KBUILD_AFLAGS_KERNEL :=
411 KBUILD_CFLAGS_KERNEL :=
412 KBUILD_AFLAGS := -D__ASSEMBLY__
413 KBUILD_AFLAGS_MODULE := -DMODULE
414 KBUILD_CFLAGS_MODULE := -DMODULE
415 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
417 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
418 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
419 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
421 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
422 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
423 export CPP AR NM STRIP OBJCOPY OBJDUMP LDFINAL
424 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
425 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
427 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
428 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
429 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
430 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
431 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
432 export KBUILD_ARFLAGS
435 # LTO gcc creates a lot of files in TMPDIR, and with /tmp as tmpfs
436 # it's easy to drive the machine OOM. Use the object directory
441 $(info setting TMPDIR=$(objtree) for LTO build)
445 # When compiling out-of-tree modules, put MODVERDIR in the module
446 # tree rather than in the kernel tree. The kernel tree might
448 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
450 # Files to ignore in find ... statements
452 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
453 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
455 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
456 --exclude CVS --exclude .pc --exclude .hg --exclude .git
458 # ===========================================================================
459 # Rules shared between *config targets and build targets
461 # Basic helpers built in scripts/
462 PHONY += scripts_basic
464 $(Q)$(MAKE) $(build)=scripts/basic
465 $(Q)rm -f .tmp_quiet_recordmcount
467 # To avoid any implicit rule to kick in, define an empty command.
468 scripts/basic/%: scripts_basic ;
470 PHONY += outputmakefile
471 # outputmakefile generates a Makefile in the output directory, if using a
472 # separate output directory. This allows convenient use of make in the
475 ifneq ($(KBUILD_SRC),)
476 $(Q)ln -fsn $(srctree) source
477 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
478 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
481 # Support for using generic headers in asm-generic
484 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
485 src=asm obj=arch/$(SRCARCH)/include/generated/asm
486 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
487 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
489 # To make sure we do not include .config for any of the *config targets
490 # catch them early, and hand them over to scripts/kconfig/Makefile
491 # It is allowed to specify more targets when calling make, including
492 # mixing *config targets and build targets.
493 # For example 'make oldconfig all'.
494 # Detect when mixed targets is specified, and make a second invocation
495 # of make so .config is not included in this case either (for *config).
497 version_h := include/generated/uapi/linux/version.h
499 no-dot-config-targets := clean mrproper distclean \
500 cscope gtags TAGS tags help %docs check% coccicheck \
501 $(version_h) headers_% archheaders archscripts \
502 kernelversion %src-pkg
508 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
509 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
514 ifeq ($(KBUILD_EXTMOD),)
515 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
517 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
523 ifeq ($(mixed-targets),1)
524 # ===========================================================================
525 # We're called with mixed targets (*config and build targets).
526 # Handle them one by one.
528 PHONY += $(MAKECMDGOALS) __build_one_by_one
530 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
535 for i in $(MAKECMDGOALS); do \
536 $(MAKE) -f $(srctree)/Makefile $$i; \
540 ifeq ($(config-targets),1)
541 # ===========================================================================
542 # *config targets only - make sure prerequisites are updated, and descend
543 # in scripts/kconfig to make the *config target
545 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
546 # KBUILD_DEFCONFIG may point out an alternative default configuration
547 # used for 'make defconfig'
548 include $(srctree)/arch/$(SRCARCH)/Makefile
549 export KBUILD_DEFCONFIG KBUILD_KCONFIG
551 config: scripts_basic outputmakefile FORCE
552 $(Q)mkdir -p include/linux include/config
553 $(Q)$(MAKE) $(build)=scripts/kconfig $@
555 %config: scripts_basic outputmakefile FORCE
556 $(Q)mkdir -p include/linux include/config
557 $(Q)$(MAKE) $(build)=scripts/kconfig $@
560 # ===========================================================================
561 # Build targets only - this includes vmlinux, arch specific targets, clean
562 # targets and others. In general all targets except *config targets.
564 ifeq ($(KBUILD_EXTMOD),)
565 # Additional helpers built in scripts/
566 # Carefully list dependencies so we do not try to build scripts twice
569 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
571 $(Q)$(MAKE) $(build)=$(@)
573 # Objects we will link into vmlinux / subdirs we need to visit
575 drivers-y := drivers/ sound/ firmware/
579 endif # KBUILD_EXTMOD
581 ifeq ($(dot-config),1)
583 -include include/config/auto.conf
585 ifeq ($(KBUILD_EXTMOD),)
586 # Read in dependencies to all Kconfig* files, make sure to run
587 # oldconfig if changes are detected.
588 -include include/config/auto.conf.cmd
590 # To avoid any implicit rule to kick in, define an empty command
591 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
593 # If .config is newer than include/config/auto.conf, someone tinkered
594 # with it and forgot to run make oldconfig.
595 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
596 # we execute the config step to be sure to catch updated Kconfig files
597 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
598 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
600 # external modules needs include/generated/autoconf.h and include/config/auto.conf
601 # but do not care if they are up-to-date. Use auto.conf to trigger the test
602 PHONY += include/config/auto.conf
604 include/config/auto.conf:
605 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
607 echo >&2 " ERROR: Kernel configuration is invalid."; \
608 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
609 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
613 endif # KBUILD_EXTMOD
616 # Dummy target needed, because used as prerequisite
617 include/config/auto.conf: ;
618 endif # $(dot-config)
620 # The all: target is the default when no target is given on the
622 # This allow a user to issue only 'make' to build a kernel including modules
623 # Defaults to vmlinux, but the arch makefile usually adds further targets
626 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
627 KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
632 include $(srctree)/arch/$(SRCARCH)/Makefile
634 ifdef CONFIG_READABLE_ASM
635 # Disable optimizations that make assembler listings hard to read.
636 # reorder blocks reorders the control in the function
637 # ipa clone creates specialized cloned functions
638 # partial inlining inlines only parts of functions
639 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
640 $(call cc-option,-fno-ipa-cp-clone,) \
641 $(call cc-option,-fno-partial-inlining)
644 ifneq ($(CONFIG_FRAME_WARN),0)
645 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
648 # Handle stack protector mode.
649 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
650 stackp-flag := -fstack-protector
651 ifeq ($(call cc-option, $(stackp-flag)),)
652 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
653 -fstack-protector not supported by compiler)
656 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
657 stackp-flag := -fstack-protector-strong
658 ifeq ($(call cc-option, $(stackp-flag)),)
659 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
660 -fstack-protector-strong not supported by compiler)
663 # Force off for distro compilers that enable stack protector by default.
664 stackp-flag := $(call cc-option, -fno-stack-protector)
667 KBUILD_CFLAGS += $(stackp-flag)
669 ifeq ($(COMPILER),clang)
670 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
671 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
672 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
673 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
674 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
675 # Quiet clang warning: comparison of unsigned expression < 0 is always false
676 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
677 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
678 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
679 # See modpost pattern 2
680 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
683 # This warning generated too much noise in a regular build.
684 # Use make W=1 to enable this warning (see scripts/Makefile.build)
685 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
688 ifdef CONFIG_FRAME_POINTER
689 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
691 # Some targets (ARM with Thumb2, for example), can't be built with frame
692 # pointers. For those, we don't have FUNCTION_TRACER automatically
693 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
694 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
695 # -fomit-frame-pointer with FUNCTION_TRACER.
696 ifndef CONFIG_FUNCTION_TRACER
697 KBUILD_CFLAGS += -fomit-frame-pointer
701 ifdef CONFIG_DEBUG_INFO
703 KBUILD_AFLAGS += -Wa,--gdwarf-2
706 ifdef CONFIG_DEBUG_INFO_REDUCED
707 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
708 $(call cc-option,-fno-var-tracking)
711 ifdef CONFIG_FUNCTION_TRACER
712 ifdef CONFIG_HAVE_FENTRY
713 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
715 KBUILD_CFLAGS += -pg $(CC_USING_FENTRY)
716 KBUILD_AFLAGS += $(CC_USING_FENTRY)
717 ifdef CONFIG_DYNAMIC_FTRACE
718 ifdef CONFIG_HAVE_C_RECORDMCOUNT
719 BUILD_C_RECORDMCOUNT := y
720 export BUILD_C_RECORDMCOUNT
725 # We trigger additional mismatches with less inlining
726 ifdef CONFIG_DEBUG_SECTION_MISMATCH
727 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
730 # arch Makefile may override CC so keep this after arch Makefile is included
731 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
732 CHECKFLAGS += $(NOSTDINC_FLAGS)
734 # warn about C99 declaration after statement
735 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
737 # disable pointer signed / unsigned warnings in gcc 4.0
738 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
740 # disable invalid "can't wrap" optimizations for signed / pointers
741 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
743 # conserve stack if available
744 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
746 # disallow errors like 'EXPORT_GPL(foo);' with missing header
747 KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
749 # require functions to have arguments in prototypes, not empty 'int foo()'
750 KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
752 # Prohibit date/time macros, which would make the build non-deterministic
753 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
755 # use the deterministic mode of AR if available
756 KBUILD_ARFLAGS := $(call ar-option,D)
758 # check for 'asm goto'
759 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
760 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
763 include $(srctree)/scripts/Makefile.extrawarn
764 include ${srctree}/scripts/Makefile.lto
766 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
767 KBUILD_CPPFLAGS += $(KCPPFLAGS)
768 KBUILD_AFLAGS += $(KAFLAGS)
769 KBUILD_CFLAGS += $(KCFLAGS)
771 # Use --build-id when available.
772 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
773 $(call cc-ldoption, -Wl$(comma)--build-id,))
774 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
775 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
777 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
778 LDFLAGS_vmlinux += $(call ld-option, -X,)
781 # Default kernel image to build when no specific target is given.
782 # KBUILD_IMAGE may be overruled on the command line or
783 # set in the environment
784 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
786 export KBUILD_IMAGE ?= vmlinux
789 # INSTALL_PATH specifies where to place the updated kernel and system map
790 # images. Default is /boot, but you can set it to other values
791 export INSTALL_PATH ?= /boot
794 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
795 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
796 # an argument if needed. Otherwise it defaults to the kernel install path
798 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
801 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
802 # relocations required by build roots. This is not defined in the
803 # makefile but the argument can be passed to make if needed.
806 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
810 # INSTALL_MOD_STRIP, if defined, will cause modules to be
811 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
812 # the default option --strip-debug will be used. Otherwise,
813 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
815 ifdef INSTALL_MOD_STRIP
816 ifeq ($(INSTALL_MOD_STRIP),1)
817 mod_strip_cmd = $(STRIP) --strip-debug
819 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
820 endif # INSTALL_MOD_STRIP=1
823 endif # INSTALL_MOD_STRIP
826 # Select initial ramdisk compression format, default is gzip(1).
827 # This shall be used by the dracut(8) tool while creating an initramfs image.
829 INITRD_COMPRESS-y := gzip
830 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
831 INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
832 INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
833 INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
834 INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
835 # do not export INITRD_COMPRESS, since we didn't actually
836 # choose a sane default compression above.
837 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
839 ifdef CONFIG_MODULE_SIG_ALL
840 MODSECKEY = ./signing_key.priv
841 MODPUBKEY = ./signing_key.x509
843 mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
850 ifeq ($(KBUILD_EXTMOD),)
851 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
853 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
854 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
855 $(net-y) $(net-m) $(libs-y) $(libs-m)))
857 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
859 $(core-n) $(core-) $(drivers-n) $(drivers-) \
860 $(net-n) $(net-) $(libs-n) $(libs-))))
862 init-y := $(patsubst %/, %/built-in.o, $(init-y))
863 core-y := $(patsubst %/, %/built-in.o, $(core-y))
864 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
865 net-y := $(patsubst %/, %/built-in.o, $(net-y))
866 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
867 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
868 libs-y := $(libs-y1) $(libs-y2)
870 # Externally visible symbols (used by link-vmlinux.sh)
871 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
872 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
873 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
874 export LDFLAGS_vmlinux
875 # used by scripts/pacmage/Makefile
876 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
878 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
880 # Final link of vmlinux
881 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
882 quiet_cmd_link-vmlinux = LINK $@
884 # Include targets which we want to
885 # execute if the rest of the kernel build went well.
886 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
887 ifdef CONFIG_HEADERS_CHECK
888 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
891 $(Q)$(MAKE) $(build)=samples
893 ifdef CONFIG_BUILD_DOCSRC
894 $(Q)$(MAKE) $(build)=Documentation
896 +$(call if_changed,link-vmlinux)
898 # The actual objects are generated when descending,
899 # make sure no implicit rule kicks in
900 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
902 # Handle descending into subdirectories listed in $(vmlinux-dirs)
903 # Preset locale variables to speed up the build process. Limit locale
904 # tweaks to this spot to avoid wrong language settings when running
905 # make menuconfig etc.
906 # Error messages still appears in the original language
908 PHONY += $(vmlinux-dirs)
909 $(vmlinux-dirs): prepare scripts
910 $(Q)$(MAKE) $(build)=$@
912 define filechk_kernel.release
913 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
916 # Store (new) KERNELRELEASE string in include/config/kernel.release
917 include/config/kernel.release: include/config/auto.conf FORCE
918 $(call filechk,kernel.release)
921 # Things we need to do before we recursively start building the kernel
922 # or the modules are listed in "prepare".
923 # A multi level approach is used. prepareN is processed before prepareN-1.
924 # archprepare is used in arch Makefiles and when processed asm symlink,
925 # version.h and scripts_basic is processed / created.
927 # Listed in dependency order
928 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
930 # prepare3 is used to check if we are building in a separate output directory,
932 # 1) Check that make has not been executed in the kernel src $(srctree)
933 prepare3: include/config/kernel.release
934 ifneq ($(KBUILD_SRC),)
935 @$(kecho) ' Using $(srctree) as source for kernel'
936 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
937 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
938 echo >&2 " in the '$(srctree)' directory.";\
943 # prepare2 creates a makefile if using a separate output directory
944 prepare2: prepare3 outputmakefile asm-generic
946 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
947 include/config/auto.conf
950 archprepare: archheaders archscripts prepare1 scripts_basic
952 prepare0: archprepare FORCE
953 $(Q)$(MAKE) $(build)=.
955 # All the preparing..
958 # Generate some files
959 # ---------------------------------------------------------------------------
961 # KERNELRELEASE can change from a few different places, meaning version.h
962 # needs to be updated, so this check is forced on all builds
965 define filechk_utsrelease.h
966 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
967 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
970 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
973 define filechk_version.h
974 (echo \#define LINUX_VERSION_CODE $(shell \
975 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
976 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
979 $(version_h): $(srctree)/Makefile FORCE
980 $(call filechk,version.h)
982 include/generated/utsrelease.h: include/config/kernel.release FORCE
983 $(call filechk,utsrelease.h)
987 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
988 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
990 # ---------------------------------------------------------------------------
994 @echo '*** Warning: make $@ is unnecessary now.'
996 # ---------------------------------------------------------------------------
998 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
999 export INSTALL_FW_PATH
1001 PHONY += firmware_install
1002 firmware_install: FORCE
1003 @mkdir -p $(objtree)/firmware
1004 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1006 # ---------------------------------------------------------------------------
1009 #Default location for installed headers
1010 export INSTALL_HDR_PATH = $(objtree)/usr
1012 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1014 # If we do an all arch process set dst to asm-$(hdr-arch)
1015 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1017 PHONY += archheaders
1020 PHONY += archscripts
1024 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts 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/uapi/asm/Kbuild),, \
1034 $(error Headers not exportable for the $(SRCARCH) architecture))
1035 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1036 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/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/uapi HDRCHECK=1
1045 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1047 # ---------------------------------------------------------------------------
1050 ifdef CONFIG_MODULES
1052 # By default, build modules as well
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.
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
1086 @rm -rf $(MODLIB)/kernel
1087 @rm -f $(MODLIB)/source
1088 @mkdir -p $(MODLIB)/kernel
1089 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1090 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1091 rm -f $(MODLIB)/build ; \
1092 ln -s $(CURDIR) $(MODLIB)/build ; \
1094 @cp -f $(objtree)/modules.order $(MODLIB)/
1095 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1096 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1098 # This depmod is only for convenience to give the initial
1099 # boot a modules.dep even before / is mounted read-write. However the
1100 # boot script depmod is the master version.
1101 PHONY += _modinst_post
1102 _modinst_post: _modinst_
1103 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1106 ifeq ($(CONFIG_MODULE_SIG), y)
1107 PHONY += modules_sign
1109 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1112 else # CONFIG_MODULES
1114 # Modules not configured
1115 # ---------------------------------------------------------------------------
1117 modules modules_install: FORCE
1119 @echo >&2 "The present kernel configuration has modules disabled."
1120 @echo >&2 "Type 'make config' and enable loadable module support."
1121 @echo >&2 "Then build a kernel with module support enabled."
1125 endif # CONFIG_MODULES
1128 # Cleaning is done on three levels.
1129 # make clean Delete most generated files
1130 # Leave enough to build external modules
1131 # make mrproper Delete the current configuration, and all generated files
1132 # make distclean Remove editor backup files, patch leftover files and the like
1134 # Directories & files removed with 'make clean'
1135 CLEAN_DIRS += $(MODVERDIR)
1137 # Directories & files removed with 'make mrproper'
1138 MRPROPER_DIRS += include/config usr/include include/generated \
1139 arch/*/include/generated .tmp_objdiff
1140 MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1141 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1142 signing_key.priv signing_key.x509 x509.genkey \
1143 extra_certificates signing_key.x509.keyid \
1144 signing_key.x509.signer include/linux/version.h
1146 # clean - Delete most, but leave enough to build external modules
1148 clean: rm-dirs := $(CLEAN_DIRS)
1149 clean: rm-files := $(CLEAN_FILES)
1150 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1152 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1154 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1157 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1159 clean: archclean vmlinuxclean
1161 # mrproper - Delete all generated files, including .config
1163 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1164 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1165 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1167 PHONY += $(mrproper-dirs) mrproper archmrproper
1169 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1171 mrproper: clean archmrproper $(mrproper-dirs)
1180 @find $(srctree) $(RCS_FIND_IGNORE) \
1181 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1182 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1183 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
1184 -type f -print | xargs rm -f
1187 # Packaging of the kernel to various formats
1188 # ---------------------------------------------------------------------------
1189 # rpm target kept for backward compatibility
1190 package-dir := $(srctree)/scripts/package
1193 $(Q)$(MAKE) $(build)=$(package-dir) $@
1194 %pkg: include/config/kernel.release FORCE
1195 $(Q)$(MAKE) $(build)=$(package-dir) $@
1196 rpm: include/config/kernel.release FORCE
1197 $(Q)$(MAKE) $(build)=$(package-dir) $@
1200 # Brief documentation of the typical targets used
1201 # ---------------------------------------------------------------------------
1203 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1204 boards := $(notdir $(boards))
1205 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1206 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1209 @echo 'Cleaning targets:'
1210 @echo ' clean - Remove most generated files but keep the config and'
1211 @echo ' enough build support to build external modules'
1212 @echo ' mrproper - Remove all generated files + config + various backup files'
1213 @echo ' distclean - mrproper + remove editor backup and patch files'
1215 @echo 'Configuration targets:'
1216 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1218 @echo 'Other generic targets:'
1219 @echo ' all - Build all targets marked with [*]'
1220 @echo '* vmlinux - Build the bare kernel'
1221 @echo '* modules - Build all modules'
1222 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1223 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1224 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1225 @echo ' dir/ - Build all files in dir and below'
1226 @echo ' dir/file.[oisS] - Build specified target only'
1227 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1228 @echo ' (requires a recent binutils and recent build (System.map))'
1229 @echo ' dir/file.ko - Build module including final link'
1230 @echo ' modules_prepare - Set up for building external modules'
1231 @echo ' tags/TAGS - Generate tags file for editors'
1232 @echo ' cscope - Generate cscope index'
1233 @echo ' gtags - Generate GNU GLOBAL index'
1234 @echo ' kernelrelease - Output the release version string'
1235 @echo ' kernelversion - Output the version stored in Makefile'
1236 @echo ' image_name - Output the image name'
1237 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1238 echo ' (default: $(INSTALL_HDR_PATH))'; \
1240 @echo 'Static analysers'
1241 @echo ' checkstack - Generate a list of stack hogs'
1242 @echo ' namespacecheck - Name space analysis on compiled kernel'
1243 @echo ' versioncheck - Sanity check on version.h usage'
1244 @echo ' includecheck - Check for duplicate included header files'
1245 @echo ' export_report - List the usages of all exported symbols'
1246 @echo ' headers_check - Sanity check on exported headers'
1247 @echo ' headerdep - Detect inclusion cycles in headers'
1248 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1250 @echo 'Kernel packaging:'
1251 @$(MAKE) $(build)=$(package-dir) help
1253 @echo 'Documentation targets:'
1254 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1256 @echo 'Architecture specific targets ($(SRCARCH)):'
1257 @$(if $(archhelp),$(archhelp),\
1258 echo ' No architecture specific help defined for $(SRCARCH)')
1261 $(foreach b, $(boards), \
1262 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1264 @$(if $(board-dirs), \
1265 $(foreach b, $(board-dirs), \
1266 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1267 printf " %-16s - Show all of the above\\n" help-boards; \
1270 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1271 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1272 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1273 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1274 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1275 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1276 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1277 @echo ' 1: warnings which may be relevant and do not occur too often'
1278 @echo ' 2: warnings which occur quite often but may still be relevant'
1279 @echo ' 3: more obscure warnings, can most likely be ignored'
1280 @echo ' Multiple levels can be combined with W=12 or W=123'
1282 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1283 @echo 'For further info see the ./README file'
1286 help-board-dirs := $(addprefix help-,$(board-dirs))
1288 help-boards: $(help-board-dirs)
1290 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1292 $(help-board-dirs): help-%:
1293 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1294 @$(if $(boards-per-dir), \
1295 $(foreach b, $(boards-per-dir), \
1296 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1300 # Documentation targets
1301 # ---------------------------------------------------------------------------
1302 %docs: scripts_basic FORCE
1303 $(Q)$(MAKE) $(build)=scripts build_docproc
1304 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1306 else # KBUILD_EXTMOD
1309 # External module support.
1310 # When building external modules the kernel used as basis is considered
1311 # read-only, and no consistency checks are made and the make
1312 # system is not used on the basis kernel. If updates are required
1313 # in the basis kernel ordinary make commands (without M=...) must
1316 # The following are the only valid targets when building external
1318 # make M=dir clean Delete all automatically generated files
1319 # make M=dir modules Make all modules in specified dir
1320 # make M=dir Same as 'make M=dir modules'
1321 # make M=dir modules_install
1322 # Install the modules built in the module directory
1323 # Assumes install directory is already created
1325 # We are always building modules
1327 PHONY += crmodverdir
1331 PHONY += $(objtree)/Module.symvers
1332 $(objtree)/Module.symvers:
1333 @test -e $(objtree)/Module.symvers || ( \
1335 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1336 echo " is missing; modules will have no dependencies and modversions."; \
1339 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1340 PHONY += $(module-dirs) modules
1341 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1342 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1344 modules: $(module-dirs)
1345 @$(kecho) ' Building modules, stage 2.';
1346 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1348 PHONY += modules_install
1349 modules_install: _emodinst_ _emodinst_post
1351 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1354 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1355 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1357 PHONY += _emodinst_post
1358 _emodinst_post: _emodinst_
1361 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1363 PHONY += $(clean-dirs) clean
1365 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1367 clean: rm-dirs := $(MODVERDIR)
1368 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1371 @echo ' Building external modules.'
1372 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1374 @echo ' modules - default target, build the module(s)'
1375 @echo ' modules_install - install the module'
1376 @echo ' clean - remove generated files in module directory only'
1380 PHONY += prepare scripts
1383 endif # KBUILD_EXTMOD
1385 clean: $(clean-dirs)
1388 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1389 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1391 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1392 -o -name '*.symtypes' -o -name 'modules.order' \
1393 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1394 -o -name '*.gcno' \) -type f -print | xargs rm -f
1396 # Generate tags for editors
1397 # ---------------------------------------------------------------------------
1398 quiet_cmd_tags = GEN $@
1399 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1401 tags TAGS cscope gtags: FORCE
1404 # Scripts to check various things for consistency
1405 # ---------------------------------------------------------------------------
1407 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1410 find $(srctree)/* $(RCS_FIND_IGNORE) \
1411 -name '*.[hcS]' -type f -print | sort \
1412 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1415 find $(srctree)/* $(RCS_FIND_IGNORE) \
1416 -name '*.[hcS]' -type f -print | sort \
1417 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1420 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1423 $(PERL) $(srctree)/scripts/namespace.pl
1426 $(PERL) $(srctree)/scripts/export_report.pl
1428 endif #ifeq ($(config-targets),1)
1429 endif #ifeq ($(mixed-targets),1)
1431 PHONY += checkstack kernelrelease kernelversion image_name
1433 # UML needs a little special treatment here. It wants to use the host
1434 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1435 # else wants $(ARCH), including people doing cross-builds, which means
1436 # that $(SUBARCH) doesn't work here.
1438 CHECKSTACK_ARCH := $(SUBARCH)
1440 CHECKSTACK_ARCH := $(ARCH)
1443 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1444 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1447 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1450 @echo $(KERNELVERSION)
1453 @echo $(KBUILD_IMAGE)
1455 # Clear a bunch of variables before executing the submake
1457 $(Q)mkdir -p $(objtree)/tools
1458 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1461 $(Q)mkdir -p $(objtree)/tools
1462 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1465 # ---------------------------------------------------------------------------
1466 # Single targets are compatible with:
1467 # - build with mixed source and output
1468 # - build with separate output dir 'make O=...'
1469 # - external modules
1471 # target-dir => where to store outputfile
1472 # build-dir => directory in kernel source tree to use
1474 ifeq ($(KBUILD_EXTMOD),)
1475 build-dir = $(patsubst %/,%,$(dir $@))
1476 target-dir = $(dir $@)
1478 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1479 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1480 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1483 %.s: %.c prepare scripts FORCE
1484 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1485 %.i: %.c prepare scripts FORCE
1486 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1487 %.o: %.c prepare scripts FORCE
1488 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1489 %.lst: %.c prepare scripts FORCE
1490 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1491 %.s: %.S prepare scripts FORCE
1492 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1493 %.o: %.S prepare scripts FORCE
1494 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1495 %.symtypes: %.c prepare scripts FORCE
1496 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1499 /: prepare scripts FORCE
1501 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1502 $(build)=$(build-dir)
1503 %/: prepare scripts FORCE
1505 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1506 $(build)=$(build-dir)
1507 %.ko: prepare scripts FORCE
1509 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1510 $(build)=$(build-dir) $(@:.ko=.o)
1511 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1513 # FIXME Should go into a make.lib or something
1514 # ===========================================================================
1516 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1517 cmd_rmdirs = rm -rf $(rm-dirs)
1519 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1520 cmd_rmfiles = rm -f $(rm-files)
1522 # Run depmod only if we have System.map and depmod is executable
1523 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1524 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1525 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1527 # Create temporary dir for module support files
1528 # clean it up only when building all modules
1529 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1530 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1532 # read all saved command lines
1534 targets := $(wildcard $(sort $(targets)))
1535 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1537 ifneq ($(cmd_files),)
1538 $(cmd_files): ; # Do not try to update included dependency files
1539 include $(cmd_files)
1542 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1544 # $(Q)$(MAKE) $(clean)=dir
1545 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1547 endif # skip-makefile
1552 # Declare the contents of the .PHONY variable as phony. We keep that
1553 # information in a variable so we can use it in if_changed and friends.