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 srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
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/x86/ -e s/x86_64/x86/ \
169 -e s/sun4u/sparc64/ \
170 -e s/arm.*/arm/ -e s/sa110/arm/ \
171 -e s/s390x/s390/ -e s/parisc64/parisc/ \
172 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
173 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
175 # Cross compiling and selecting different set of gcc/bin-utils
176 # ---------------------------------------------------------------------------
178 # When performing cross compilation for other architectures ARCH shall be set
179 # to the target architecture. (See arch/* for the possibilities).
180 # ARCH can be set during invocation of make:
182 # Another way is to have ARCH set in the environment.
183 # The default ARCH is the host where make is executed.
185 # CROSS_COMPILE specify the prefix used for all executables used
186 # during compilation. Only gcc and related bin-utils executables
187 # are prefixed with $(CROSS_COMPILE).
188 # CROSS_COMPILE can be set on the command line
189 # make CROSS_COMPILE=ia64-linux-
190 # Alternatively CROSS_COMPILE can be set in the environment.
191 # A third alternative is to store a setting in .config so that plain
192 # "make" in the configured kernel build directory always uses that.
193 # Default value for CROSS_COMPILE is not to prefix executables
194 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
196 CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
198 # Architecture as present in compile.h
199 UTS_MACHINE := $(ARCH)
202 # Additional ARCH settings for x86
206 ifeq ($(ARCH),x86_64)
210 # Additional ARCH settings for sparc
211 ifeq ($(ARCH),sparc32)
214 ifeq ($(ARCH),sparc64)
218 # Additional ARCH settings for sh
223 # Additional ARCH settings for tile
224 ifeq ($(ARCH),tilepro)
227 ifeq ($(ARCH),tilegx)
231 # Where to locate arch specific headers
232 hdr-arch := $(SRCARCH)
234 KCONFIG_CONFIG ?= .config
235 export KCONFIG_CONFIG
237 # SHELL used by kbuild
238 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
239 else if [ -x /bin/bash ]; then echo /bin/bash; \
240 else echo sh; fi ; fi)
244 HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
247 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
248 HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
249 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
252 # Decide whether to build built-in, modular, or both.
253 # Normally, just do built-in.
258 # If we have only "make modules", don't compile built-in objects.
259 # When we're building modules with modversions, we need to consider
260 # the built-in objects during the descend as well, in order to
261 # make sure the checksums are up to date before we record them.
263 ifeq ($(MAKECMDGOALS),modules)
264 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
267 # If we have "make <whatever> modules", compile modules
268 # in addition to whatever we do anyway.
269 # Just "make" or "make all" shall build modules as well
271 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
275 ifeq ($(MAKECMDGOALS),)
279 export KBUILD_MODULES KBUILD_BUILTIN
280 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
283 # ---------------------------------------------------------------------------
285 # Normally, we echo the whole command before executing it. By making
286 # that echo $($(quiet)$(cmd)), we now have the possibility to set
287 # $(quiet) to choose other forms of output instead, e.g.
289 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
290 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
292 # If $(quiet) is empty, the whole command will be printed.
293 # If it is set to "quiet_", only the short version will be printed.
294 # If it is set to "silent_", nothing will be printed at all, since
295 # the variable $(silent_cmd_cc_o_c) doesn't exist.
297 # A simple variant is to prefix commands with $(Q) - that's useful
298 # for commands that shall be hidden in non-verbose mode.
302 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
303 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
305 ifeq ($(KBUILD_VERBOSE),1)
313 # If the user is running make -s (silent mode), suppress echoing of
316 ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
317 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
321 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
326 export quiet Q KBUILD_VERBOSE
329 ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1)
337 # Look for make include files relative to root of kernel src
338 MAKEFLAGS += --include-dir=$(srctree)
340 # We need some generic definitions (do not try to remake the file).
341 $(srctree)/scripts/Kbuild.include: ;
342 include $(srctree)/scripts/Kbuild.include
344 # Make variables (CC, etc...)
345 AS = $(CROSS_COMPILE)as
346 LD = $(CROSS_COMPILE)ld
348 CC = $(CROSS_COMPILE)gcc
351 AR = $(CROSS_COMPILE)gcc-ar
353 AR = $(CROSS_COMPILE)ar
355 NM = $(CROSS_COMPILE)nm
356 STRIP = $(CROSS_COMPILE)strip
357 OBJCOPY = $(CROSS_COMPILE)objcopy
358 OBJDUMP = $(CROSS_COMPILE)objdump
360 GENKSYMS = scripts/genksyms/genksyms
361 INSTALLKERNEL := installkernel
362 DEPMOD = /sbin/depmod
366 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
367 -Wbitwise -Wno-return-void $(CF)
373 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
376 # Use USERINCLUDE when you must reference the UAPI directories only.
378 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
379 -Iarch/$(hdr-arch)/include/generated/uapi \
380 -I$(srctree)/include/uapi \
381 -Iinclude/generated/uapi \
382 -include $(srctree)/include/linux/kconfig.h
384 # Use LINUXINCLUDE when you must reference the include/ directory.
385 # Needed to be compatible with the O= option
387 -I$(srctree)/arch/$(hdr-arch)/include \
388 -Iarch/$(hdr-arch)/include/generated \
389 $(if $(KBUILD_SRC), -I$(srctree)/include) \
393 KBUILD_CPPFLAGS := -D__KERNEL__
395 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
396 -fno-strict-aliasing -fno-common \
397 -Werror-implicit-function-declaration \
398 -Wno-format-security \
399 $(call cc-option,-fno-delete-null-pointer-checks,)
400 KBUILD_AFLAGS_KERNEL :=
401 KBUILD_CFLAGS_KERNEL :=
402 KBUILD_AFLAGS := -D__ASSEMBLY__
403 KBUILD_AFLAGS_MODULE := -DMODULE
404 KBUILD_CFLAGS_MODULE := -DMODULE
405 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
407 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
408 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
409 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
411 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
412 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
413 export CPP AR NM STRIP OBJCOPY OBJDUMP LDFINAL
414 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
415 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
417 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
418 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
419 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
420 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
421 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
422 export KBUILD_ARFLAGS
425 # LTO gcc creates a lot of files in TMPDIR, and with /tmp as tmpfs
426 # it's easy to drive the machine OOM. Use the object directory
431 $(info setting TMPDIR=$(objtree) for LTO build)
435 # When compiling out-of-tree modules, put MODVERDIR in the module
436 # tree rather than in the kernel tree. The kernel tree might
438 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
440 # Files to ignore in find ... statements
442 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
443 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
445 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
446 --exclude CVS --exclude .pc --exclude .hg --exclude .git
448 # ===========================================================================
449 # Rules shared between *config targets and build targets
451 # Basic helpers built in scripts/
452 PHONY += scripts_basic
454 $(Q)$(MAKE) $(build)=scripts/basic
455 $(Q)rm -f .tmp_quiet_recordmcount
457 # To avoid any implicit rule to kick in, define an empty command.
458 scripts/basic/%: scripts_basic ;
460 PHONY += outputmakefile
461 # outputmakefile generates a Makefile in the output directory, if using a
462 # separate output directory. This allows convenient use of make in the
465 ifneq ($(KBUILD_SRC),)
466 $(Q)ln -fsn $(srctree) source
467 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
468 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
471 # Support for using generic headers in asm-generic
474 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
475 src=asm obj=arch/$(SRCARCH)/include/generated/asm
476 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
477 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
479 # To make sure we do not include .config for any of the *config targets
480 # catch them early, and hand them over to scripts/kconfig/Makefile
481 # It is allowed to specify more targets when calling make, including
482 # mixing *config targets and build targets.
483 # For example 'make oldconfig all'.
484 # Detect when mixed targets is specified, and make a second invocation
485 # of make so .config is not included in this case either (for *config).
487 version_h := include/generated/uapi/linux/version.h
489 no-dot-config-targets := clean mrproper distclean \
490 cscope gtags TAGS tags help %docs check% coccicheck \
491 $(version_h) headers_% archheaders archscripts \
492 kernelversion %src-pkg
498 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
499 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
504 ifeq ($(KBUILD_EXTMOD),)
505 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
507 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
513 ifeq ($(mixed-targets),1)
514 # ===========================================================================
515 # We're called with mixed targets (*config and build targets).
516 # Handle them one by one.
518 PHONY += $(MAKECMDGOALS) __build_one_by_one
520 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
525 for i in $(MAKECMDGOALS); do \
526 $(MAKE) -f $(srctree)/Makefile $$i; \
530 ifeq ($(config-targets),1)
531 # ===========================================================================
532 # *config targets only - make sure prerequisites are updated, and descend
533 # in scripts/kconfig to make the *config target
535 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
536 # KBUILD_DEFCONFIG may point out an alternative default configuration
537 # used for 'make defconfig'
538 include $(srctree)/arch/$(SRCARCH)/Makefile
539 export KBUILD_DEFCONFIG KBUILD_KCONFIG
541 config: scripts_basic outputmakefile FORCE
542 $(Q)mkdir -p include/linux include/config
543 $(Q)$(MAKE) $(build)=scripts/kconfig $@
545 %config: scripts_basic outputmakefile FORCE
546 $(Q)mkdir -p include/linux include/config
547 $(Q)$(MAKE) $(build)=scripts/kconfig $@
550 # ===========================================================================
551 # Build targets only - this includes vmlinux, arch specific targets, clean
552 # targets and others. In general all targets except *config targets.
554 ifeq ($(KBUILD_EXTMOD),)
555 # Additional helpers built in scripts/
556 # Carefully list dependencies so we do not try to build scripts twice
559 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
561 $(Q)$(MAKE) $(build)=$(@)
563 # Objects we will link into vmlinux / subdirs we need to visit
565 drivers-y := drivers/ sound/ firmware/
569 endif # KBUILD_EXTMOD
571 ifeq ($(dot-config),1)
573 -include include/config/auto.conf
575 ifeq ($(KBUILD_EXTMOD),)
576 # Read in dependencies to all Kconfig* files, make sure to run
577 # oldconfig if changes are detected.
578 -include include/config/auto.conf.cmd
580 # To avoid any implicit rule to kick in, define an empty command
581 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
583 # If .config is newer than include/config/auto.conf, someone tinkered
584 # with it and forgot to run make oldconfig.
585 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
586 # we execute the config step to be sure to catch updated Kconfig files
587 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
588 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
590 # external modules needs include/generated/autoconf.h and include/config/auto.conf
591 # but do not care if they are up-to-date. Use auto.conf to trigger the test
592 PHONY += include/config/auto.conf
594 include/config/auto.conf:
595 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
597 echo >&2 " ERROR: Kernel configuration is invalid."; \
598 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
599 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
603 endif # KBUILD_EXTMOD
606 # Dummy target needed, because used as prerequisite
607 include/config/auto.conf: ;
608 endif # $(dot-config)
610 # The all: target is the default when no target is given on the
612 # This allow a user to issue only 'make' to build a kernel including modules
613 # Defaults to vmlinux, but the arch makefile usually adds further targets
616 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
617 KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
622 include $(srctree)/arch/$(SRCARCH)/Makefile
624 ifdef CONFIG_READABLE_ASM
625 # Disable optimizations that make assembler listings hard to read.
626 # reorder blocks reorders the control in the function
627 # ipa clone creates specialized cloned functions
628 # partial inlining inlines only parts of functions
629 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
630 $(call cc-option,-fno-ipa-cp-clone,) \
631 $(call cc-option,-fno-partial-inlining)
634 ifneq ($(CONFIG_FRAME_WARN),0)
635 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
638 # Handle stack protector mode.
639 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
640 stackp-flag := -fstack-protector
641 ifeq ($(call cc-option, $(stackp-flag)),)
642 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
643 -fstack-protector not supported by compiler)
646 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
647 stackp-flag := -fstack-protector-strong
648 ifeq ($(call cc-option, $(stackp-flag)),)
649 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
650 -fstack-protector-strong not supported by compiler)
653 # Force off for distro compilers that enable stack protector by default.
654 stackp-flag := $(call cc-option, -fno-stack-protector)
657 KBUILD_CFLAGS += $(stackp-flag)
659 ifeq ($(COMPILER),clang)
660 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
661 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
662 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
663 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
664 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
665 # Quiet clang warning: comparison of unsigned expression < 0 is always false
666 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
667 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
668 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
669 # See modpost pattern 2
670 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
673 # This warning generated too much noise in a regular build.
674 # Use make W=1 to enable this warning (see scripts/Makefile.build)
675 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
678 ifdef CONFIG_FRAME_POINTER
679 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
681 # Some targets (ARM with Thumb2, for example), can't be built with frame
682 # pointers. For those, we don't have FUNCTION_TRACER automatically
683 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
684 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
685 # -fomit-frame-pointer with FUNCTION_TRACER.
686 ifndef CONFIG_FUNCTION_TRACER
687 KBUILD_CFLAGS += -fomit-frame-pointer
691 ifdef CONFIG_DEBUG_INFO
693 KBUILD_AFLAGS += -Wa,--gdwarf-2
696 ifdef CONFIG_DEBUG_INFO_REDUCED
697 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
698 $(call cc-option,-fno-var-tracking)
701 ifdef CONFIG_FUNCTION_TRACER
702 ifdef CONFIG_HAVE_FENTRY
703 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
705 KBUILD_CFLAGS += -pg $(CC_USING_FENTRY)
706 KBUILD_AFLAGS += $(CC_USING_FENTRY)
707 ifdef CONFIG_DYNAMIC_FTRACE
708 ifdef CONFIG_HAVE_C_RECORDMCOUNT
709 BUILD_C_RECORDMCOUNT := y
710 export BUILD_C_RECORDMCOUNT
715 # We trigger additional mismatches with less inlining
716 ifdef CONFIG_DEBUG_SECTION_MISMATCH
717 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
720 # arch Makefile may override CC so keep this after arch Makefile is included
721 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
722 CHECKFLAGS += $(NOSTDINC_FLAGS)
724 # warn about C99 declaration after statement
725 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
727 # disable pointer signed / unsigned warnings in gcc 4.0
728 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
730 # disable invalid "can't wrap" optimizations for signed / pointers
731 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
733 # conserve stack if available
734 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
736 # disallow errors like 'EXPORT_GPL(foo);' with missing header
737 KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
739 # require functions to have arguments in prototypes, not empty 'int foo()'
740 KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
742 # Prohibit date/time macros, which would make the build non-deterministic
743 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
745 # use the deterministic mode of AR if available
746 KBUILD_ARFLAGS := $(call ar-option,D)
748 # check for 'asm goto'
749 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
750 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
753 include $(srctree)/scripts/Makefile.extrawarn
754 include ${srctree}/scripts/Makefile.lto
756 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
757 KBUILD_CPPFLAGS += $(KCPPFLAGS)
758 KBUILD_AFLAGS += $(KAFLAGS)
759 KBUILD_CFLAGS += $(KCFLAGS)
761 # Use --build-id when available.
762 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
763 $(call cc-ldoption, -Wl$(comma)--build-id,))
764 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
765 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
767 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
768 LDFLAGS_vmlinux += $(call ld-option, -X,)
771 # Default kernel image to build when no specific target is given.
772 # KBUILD_IMAGE may be overruled on the command line or
773 # set in the environment
774 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
776 export KBUILD_IMAGE ?= vmlinux
779 # INSTALL_PATH specifies where to place the updated kernel and system map
780 # images. Default is /boot, but you can set it to other values
781 export INSTALL_PATH ?= /boot
784 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
785 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
786 # an argument if needed. Otherwise it defaults to the kernel install path
788 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
791 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
792 # relocations required by build roots. This is not defined in the
793 # makefile but the argument can be passed to make if needed.
796 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
800 # INSTALL_MOD_STRIP, if defined, will cause modules to be
801 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
802 # the default option --strip-debug will be used. Otherwise,
803 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
805 ifdef INSTALL_MOD_STRIP
806 ifeq ($(INSTALL_MOD_STRIP),1)
807 mod_strip_cmd = $(STRIP) --strip-debug
809 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
810 endif # INSTALL_MOD_STRIP=1
813 endif # INSTALL_MOD_STRIP
816 # Select initial ramdisk compression format, default is gzip(1).
817 # This shall be used by the dracut(8) tool while creating an initramfs image.
819 INITRD_COMPRESS-y := gzip
820 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
821 INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
822 INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
823 INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
824 INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
825 # do not export INITRD_COMPRESS, since we didn't actually
826 # choose a sane default compression above.
827 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
829 ifdef CONFIG_MODULE_SIG_ALL
830 MODSECKEY = ./signing_key.priv
831 MODPUBKEY = ./signing_key.x509
833 mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
840 ifeq ($(KBUILD_EXTMOD),)
841 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
843 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
844 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
845 $(net-y) $(net-m) $(libs-y) $(libs-m)))
847 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
849 $(core-n) $(core-) $(drivers-n) $(drivers-) \
850 $(net-n) $(net-) $(libs-n) $(libs-))))
852 init-y := $(patsubst %/, %/built-in.o, $(init-y))
853 core-y := $(patsubst %/, %/built-in.o, $(core-y))
854 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
855 net-y := $(patsubst %/, %/built-in.o, $(net-y))
856 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
857 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
858 libs-y := $(libs-y1) $(libs-y2)
860 # Externally visible symbols (used by link-vmlinux.sh)
861 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
862 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
863 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
864 export LDFLAGS_vmlinux
865 # used by scripts/pacmage/Makefile
866 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
868 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
870 # Final link of vmlinux
871 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
872 quiet_cmd_link-vmlinux = LINK $@
874 # Include targets which we want to
875 # execute if the rest of the kernel build went well.
876 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
877 ifdef CONFIG_HEADERS_CHECK
878 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
881 $(Q)$(MAKE) $(build)=samples
883 ifdef CONFIG_BUILD_DOCSRC
884 $(Q)$(MAKE) $(build)=Documentation
886 +$(call if_changed,link-vmlinux)
888 # The actual objects are generated when descending,
889 # make sure no implicit rule kicks in
890 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
892 # Handle descending into subdirectories listed in $(vmlinux-dirs)
893 # Preset locale variables to speed up the build process. Limit locale
894 # tweaks to this spot to avoid wrong language settings when running
895 # make menuconfig etc.
896 # Error messages still appears in the original language
898 PHONY += $(vmlinux-dirs)
899 $(vmlinux-dirs): prepare scripts
900 $(Q)$(MAKE) $(build)=$@
902 define filechk_kernel.release
903 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
906 # Store (new) KERNELRELEASE string in include/config/kernel.release
907 include/config/kernel.release: include/config/auto.conf FORCE
908 $(call filechk,kernel.release)
911 # Things we need to do before we recursively start building the kernel
912 # or the modules are listed in "prepare".
913 # A multi level approach is used. prepareN is processed before prepareN-1.
914 # archprepare is used in arch Makefiles and when processed asm symlink,
915 # version.h and scripts_basic is processed / created.
917 # Listed in dependency order
918 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
920 # prepare3 is used to check if we are building in a separate output directory,
922 # 1) Check that make has not been executed in the kernel src $(srctree)
923 prepare3: include/config/kernel.release
924 ifneq ($(KBUILD_SRC),)
925 @$(kecho) ' Using $(srctree) as source for kernel'
926 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
927 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
928 echo >&2 " in the '$(srctree)' directory.";\
933 # prepare2 creates a makefile if using a separate output directory
934 prepare2: prepare3 outputmakefile asm-generic
936 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
937 include/config/auto.conf
940 archprepare: archheaders archscripts prepare1 scripts_basic
942 prepare0: archprepare FORCE
943 $(Q)$(MAKE) $(build)=.
945 # All the preparing..
948 # Generate some files
949 # ---------------------------------------------------------------------------
951 # KERNELRELEASE can change from a few different places, meaning version.h
952 # needs to be updated, so this check is forced on all builds
955 define filechk_utsrelease.h
956 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
957 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
960 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
963 define filechk_version.h
964 (echo \#define LINUX_VERSION_CODE $(shell \
965 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
966 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
969 $(version_h): $(srctree)/Makefile FORCE
970 $(call filechk,version.h)
972 include/generated/utsrelease.h: include/config/kernel.release FORCE
973 $(call filechk,utsrelease.h)
977 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
978 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
980 # ---------------------------------------------------------------------------
984 @echo '*** Warning: make $@ is unnecessary now.'
986 # ---------------------------------------------------------------------------
988 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
989 export INSTALL_FW_PATH
991 PHONY += firmware_install
992 firmware_install: FORCE
993 @mkdir -p $(objtree)/firmware
994 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
996 # ---------------------------------------------------------------------------
999 #Default location for installed headers
1000 export INSTALL_HDR_PATH = $(objtree)/usr
1002 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1004 # If we do an all arch process set dst to asm-$(hdr-arch)
1005 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1007 PHONY += archheaders
1010 PHONY += archscripts
1014 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1015 $(Q)$(MAKE) $(build)=scripts build_unifdef
1017 PHONY += headers_install_all
1018 headers_install_all:
1019 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1021 PHONY += headers_install
1022 headers_install: __headers
1023 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1024 $(error Headers not exportable for the $(SRCARCH) architecture))
1025 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1026 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1028 PHONY += headers_check_all
1029 headers_check_all: headers_install_all
1030 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1032 PHONY += headers_check
1033 headers_check: headers_install
1034 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1035 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1037 # ---------------------------------------------------------------------------
1040 ifdef CONFIG_MODULES
1042 # By default, build modules as well
1048 # A module can be listed more than once in obj-m resulting in
1049 # duplicate lines in modules.order files. Those are removed
1050 # using awk while concatenating to the final file.
1053 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1054 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1055 @$(kecho) ' Building modules, stage 2.';
1056 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1057 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1059 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1060 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1062 %/modules.builtin: include/config/auto.conf
1063 $(Q)$(MAKE) $(modbuiltin)=$*
1066 # Target to prepare building external modules
1067 PHONY += modules_prepare
1068 modules_prepare: prepare scripts
1070 # Target to install modules
1071 PHONY += modules_install
1072 modules_install: _modinst_ _modinst_post
1076 @rm -rf $(MODLIB)/kernel
1077 @rm -f $(MODLIB)/source
1078 @mkdir -p $(MODLIB)/kernel
1079 @ln -s $(srctree) $(MODLIB)/source
1080 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1081 rm -f $(MODLIB)/build ; \
1082 ln -s $(objtree) $(MODLIB)/build ; \
1084 @cp -f $(objtree)/modules.order $(MODLIB)/
1085 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1086 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1088 # This depmod is only for convenience to give the initial
1089 # boot a modules.dep even before / is mounted read-write. However the
1090 # boot script depmod is the master version.
1091 PHONY += _modinst_post
1092 _modinst_post: _modinst_
1093 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1096 ifeq ($(CONFIG_MODULE_SIG), y)
1097 PHONY += modules_sign
1099 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1102 else # CONFIG_MODULES
1104 # Modules not configured
1105 # ---------------------------------------------------------------------------
1107 modules modules_install: FORCE
1109 @echo >&2 "The present kernel configuration has modules disabled."
1110 @echo >&2 "Type 'make config' and enable loadable module support."
1111 @echo >&2 "Then build a kernel with module support enabled."
1115 endif # CONFIG_MODULES
1118 # Cleaning is done on three levels.
1119 # make clean Delete most generated files
1120 # Leave enough to build external modules
1121 # make mrproper Delete the current configuration, and all generated files
1122 # make distclean Remove editor backup files, patch leftover files and the like
1124 # Directories & files removed with 'make clean'
1125 CLEAN_DIRS += $(MODVERDIR)
1127 # Directories & files removed with 'make mrproper'
1128 MRPROPER_DIRS += include/config usr/include include/generated \
1129 arch/*/include/generated .tmp_objdiff
1130 MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1131 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1132 signing_key.priv signing_key.x509 x509.genkey \
1133 extra_certificates signing_key.x509.keyid \
1134 signing_key.x509.signer include/linux/version.h
1136 # clean - Delete most, but leave enough to build external modules
1138 clean: rm-dirs := $(CLEAN_DIRS)
1139 clean: rm-files := $(CLEAN_FILES)
1140 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1142 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1144 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1147 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1149 clean: archclean vmlinuxclean
1151 # mrproper - Delete all generated files, including .config
1153 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1154 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1155 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1157 PHONY += $(mrproper-dirs) mrproper archmrproper
1159 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1161 mrproper: clean archmrproper $(mrproper-dirs)
1170 @find $(srctree) $(RCS_FIND_IGNORE) \
1171 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1172 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1173 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
1174 -type f -print | xargs rm -f
1177 # Packaging of the kernel to various formats
1178 # ---------------------------------------------------------------------------
1179 # rpm target kept for backward compatibility
1180 package-dir := $(srctree)/scripts/package
1183 $(Q)$(MAKE) $(build)=$(package-dir) $@
1184 %pkg: include/config/kernel.release FORCE
1185 $(Q)$(MAKE) $(build)=$(package-dir) $@
1186 rpm: include/config/kernel.release FORCE
1187 $(Q)$(MAKE) $(build)=$(package-dir) $@
1190 # Brief documentation of the typical targets used
1191 # ---------------------------------------------------------------------------
1193 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1194 boards := $(notdir $(boards))
1195 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1196 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1199 @echo 'Cleaning targets:'
1200 @echo ' clean - Remove most generated files but keep the config and'
1201 @echo ' enough build support to build external modules'
1202 @echo ' mrproper - Remove all generated files + config + various backup files'
1203 @echo ' distclean - mrproper + remove editor backup and patch files'
1205 @echo 'Configuration targets:'
1206 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1208 @echo 'Other generic targets:'
1209 @echo ' all - Build all targets marked with [*]'
1210 @echo '* vmlinux - Build the bare kernel'
1211 @echo '* modules - Build all modules'
1212 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1213 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1214 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1215 @echo ' dir/ - Build all files in dir and below'
1216 @echo ' dir/file.[oisS] - Build specified target only'
1217 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1218 @echo ' (requires a recent binutils and recent build (System.map))'
1219 @echo ' dir/file.ko - Build module including final link'
1220 @echo ' modules_prepare - Set up for building external modules'
1221 @echo ' tags/TAGS - Generate tags file for editors'
1222 @echo ' cscope - Generate cscope index'
1223 @echo ' gtags - Generate GNU GLOBAL index'
1224 @echo ' kernelrelease - Output the release version string'
1225 @echo ' kernelversion - Output the version stored in Makefile'
1226 @echo ' image_name - Output the image name'
1227 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1228 echo ' (default: $(INSTALL_HDR_PATH))'; \
1230 @echo 'Static analysers'
1231 @echo ' checkstack - Generate a list of stack hogs'
1232 @echo ' namespacecheck - Name space analysis on compiled kernel'
1233 @echo ' versioncheck - Sanity check on version.h usage'
1234 @echo ' includecheck - Check for duplicate included header files'
1235 @echo ' export_report - List the usages of all exported symbols'
1236 @echo ' headers_check - Sanity check on exported headers'
1237 @echo ' headerdep - Detect inclusion cycles in headers'
1238 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1240 @echo 'Kernel packaging:'
1241 @$(MAKE) $(build)=$(package-dir) help
1243 @echo 'Documentation targets:'
1244 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1246 @echo 'Architecture specific targets ($(SRCARCH)):'
1247 @$(if $(archhelp),$(archhelp),\
1248 echo ' No architecture specific help defined for $(SRCARCH)')
1251 $(foreach b, $(boards), \
1252 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1254 @$(if $(board-dirs), \
1255 $(foreach b, $(board-dirs), \
1256 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1257 printf " %-16s - Show all of the above\\n" help-boards; \
1260 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1261 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1262 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1263 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1264 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1265 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1266 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1267 @echo ' 1: warnings which may be relevant and do not occur too often'
1268 @echo ' 2: warnings which occur quite often but may still be relevant'
1269 @echo ' 3: more obscure warnings, can most likely be ignored'
1270 @echo ' Multiple levels can be combined with W=12 or W=123'
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));) \
1290 # Documentation targets
1291 # ---------------------------------------------------------------------------
1292 %docs: scripts_basic FORCE
1293 $(Q)$(MAKE) $(build)=scripts build_docproc
1294 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1296 else # KBUILD_EXTMOD
1299 # External module support.
1300 # When building external modules the kernel used as basis is considered
1301 # read-only, and no consistency checks are made and the make
1302 # system is not used on the basis kernel. If updates are required
1303 # in the basis kernel ordinary make commands (without M=...) must
1306 # The following are the only valid targets when building external
1308 # make M=dir clean Delete all automatically generated files
1309 # make M=dir modules Make all modules in specified dir
1310 # make M=dir Same as 'make M=dir modules'
1311 # make M=dir modules_install
1312 # Install the modules built in the module directory
1313 # Assumes install directory is already created
1315 # We are always building modules
1317 PHONY += crmodverdir
1321 PHONY += $(objtree)/Module.symvers
1322 $(objtree)/Module.symvers:
1323 @test -e $(objtree)/Module.symvers || ( \
1325 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1326 echo " is missing; modules will have no dependencies and modversions."; \
1329 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1330 PHONY += $(module-dirs) modules
1331 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1332 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1334 modules: $(module-dirs)
1335 @$(kecho) ' Building modules, stage 2.';
1336 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1338 PHONY += modules_install
1339 modules_install: _emodinst_ _emodinst_post
1341 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1344 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1345 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1347 PHONY += _emodinst_post
1348 _emodinst_post: _emodinst_
1351 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1353 PHONY += $(clean-dirs) clean
1355 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1357 clean: rm-dirs := $(MODVERDIR)
1358 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1361 @echo ' Building external modules.'
1362 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1364 @echo ' modules - default target, build the module(s)'
1365 @echo ' modules_install - install the module'
1366 @echo ' clean - remove generated files in module directory only'
1370 PHONY += prepare scripts
1373 endif # KBUILD_EXTMOD
1375 clean: $(clean-dirs)
1378 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1379 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1381 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1382 -o -name '*.symtypes' -o -name 'modules.order' \
1383 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1384 -o -name '*.gcno' \) -type f -print | xargs rm -f
1386 # Generate tags for editors
1387 # ---------------------------------------------------------------------------
1388 quiet_cmd_tags = GEN $@
1389 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1391 tags TAGS cscope gtags: FORCE
1394 # Scripts to check various things for consistency
1395 # ---------------------------------------------------------------------------
1397 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1400 find $(srctree)/* $(RCS_FIND_IGNORE) \
1401 -name '*.[hcS]' -type f -print | sort \
1402 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1405 find $(srctree)/* $(RCS_FIND_IGNORE) \
1406 -name '*.[hcS]' -type f -print | sort \
1407 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1410 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1413 $(PERL) $(srctree)/scripts/namespace.pl
1416 $(PERL) $(srctree)/scripts/export_report.pl
1418 endif #ifeq ($(config-targets),1)
1419 endif #ifeq ($(mixed-targets),1)
1421 PHONY += checkstack kernelrelease kernelversion image_name
1423 # UML needs a little special treatment here. It wants to use the host
1424 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1425 # else wants $(ARCH), including people doing cross-builds, which means
1426 # that $(SUBARCH) doesn't work here.
1428 CHECKSTACK_ARCH := $(SUBARCH)
1430 CHECKSTACK_ARCH := $(ARCH)
1433 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1434 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1437 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1440 @echo $(KERNELVERSION)
1443 @echo $(KBUILD_IMAGE)
1445 # Clear a bunch of variables before executing the submake
1447 $(Q)mkdir -p $(objtree)/tools
1448 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1451 $(Q)mkdir -p $(objtree)/tools
1452 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1455 # ---------------------------------------------------------------------------
1456 # Single targets are compatible with:
1457 # - build with mixed source and output
1458 # - build with separate output dir 'make O=...'
1459 # - external modules
1461 # target-dir => where to store outputfile
1462 # build-dir => directory in kernel source tree to use
1464 ifeq ($(KBUILD_EXTMOD),)
1465 build-dir = $(patsubst %/,%,$(dir $@))
1466 target-dir = $(dir $@)
1468 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1469 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1470 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1473 %.s: %.c prepare scripts FORCE
1474 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1475 %.i: %.c prepare scripts FORCE
1476 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1477 %.o: %.c prepare scripts FORCE
1478 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1479 %.lst: %.c prepare scripts FORCE
1480 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1481 %.s: %.S prepare scripts FORCE
1482 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1483 %.o: %.S prepare scripts FORCE
1484 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1485 %.symtypes: %.c prepare scripts FORCE
1486 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1489 /: prepare scripts FORCE
1491 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1492 $(build)=$(build-dir)
1493 %/: prepare scripts FORCE
1495 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1496 $(build)=$(build-dir)
1497 %.ko: prepare scripts FORCE
1499 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1500 $(build)=$(build-dir) $(@:.ko=.o)
1501 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1503 # FIXME Should go into a make.lib or something
1504 # ===========================================================================
1506 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1507 cmd_rmdirs = rm -rf $(rm-dirs)
1509 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1510 cmd_rmfiles = rm -f $(rm-files)
1512 # Run depmod only if we have System.map and depmod is executable
1513 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1514 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1515 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1517 # Create temporary dir for module support files
1518 # clean it up only when building all modules
1519 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1520 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1522 # read all saved command lines
1524 targets := $(wildcard $(sort $(targets)))
1525 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1527 ifneq ($(cmd_files),)
1528 $(cmd_files): ; # Do not try to update included dependency files
1529 include $(cmd_files)
1532 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1534 # $(Q)$(MAKE) $(clean)=dir
1535 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1537 endif # skip-makefile
1542 # Declare the contents of the .PHONY variable as phony. We keep that
1543 # information in a variable so we can use it in if_changed and friends.