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
45 # ---------------------------------------------------------------------------
47 # Normally, we echo the whole command before executing it. By making
48 # that echo $($(quiet)$(cmd)), we now have the possibility to set
49 # $(quiet) to choose other forms of output instead, e.g.
51 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
52 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
54 # If $(quiet) is empty, the whole command will be printed.
55 # If it is set to "quiet_", only the short version will be printed.
56 # If it is set to "silent_", nothing will be printed at all, since
57 # the variable $(silent_cmd_cc_o_c) doesn't exist.
59 # A simple variant is to prefix commands with $(Q) - that's useful
60 # for commands that shall be hidden in non-verbose mode.
64 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
65 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
67 # To put more focus on warnings, be less verbose as default
68 # Use 'make V=1' to see the full commands
70 ifeq ("$(origin V)", "command line")
77 ifeq ($(KBUILD_VERBOSE),1)
85 # If the user is running make -s (silent mode), suppress echoing of
88 ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
89 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
93 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
98 export quiet Q KBUILD_VERBOSE
100 # Call a source code checker (by default, "sparse") as part of the
103 # Use 'make C=1' to enable checking of only re-compiled files.
104 # Use 'make C=2' to enable checking of *all* source files, regardless
105 # of whether they are re-compiled or not.
107 # See the file "Documentation/sparse.txt" for more details, including
108 # where to get the "sparse" utility.
110 ifeq ("$(origin C)", "command line")
111 KBUILD_CHECKSRC = $(C)
113 ifndef KBUILD_CHECKSRC
117 # Use make M=dir to specify directory of external module to build
118 # Old syntax make ... SUBDIRS=$PWD is still supported
119 # Setting the environment variable KBUILD_EXTMOD take precedence
121 KBUILD_EXTMOD ?= $(SUBDIRS)
124 ifeq ("$(origin M)", "command line")
125 KBUILD_EXTMOD := $(M)
128 # kbuild supports saving output files in a separate directory.
129 # To locate output files in a separate directory two syntaxes are supported.
130 # In both cases the working directory must be the root of the kernel src.
132 # Use "make O=dir/to/store/output/files/"
134 # 2) Set KBUILD_OUTPUT
135 # Set the environment variable KBUILD_OUTPUT to point to the directory
136 # where the output files shall be placed.
137 # export KBUILD_OUTPUT=dir/to/store/output/files/
140 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
144 # KBUILD_SRC is set on invocation of make in OBJ directory
145 # KBUILD_SRC is not intended to be used by the regular user (for now)
146 ifeq ($(KBUILD_SRC),)
148 # OK, Make called in directory where kernel src resides
149 # Do we want to locate output files in a separate directory?
150 ifeq ("$(origin O)", "command line")
151 KBUILD_OUTPUT := $(O)
154 # That's our default target when none is given on the command line
158 # Cancel implicit rules on top Makefile
159 $(CURDIR)/Makefile Makefile: ;
161 ifneq ($(KBUILD_OUTPUT),)
162 # Invoke a second make in the output directory, passing relevant variables
163 # check that the output directory actually exists
164 saved-output := $(KBUILD_OUTPUT)
165 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
167 $(if $(KBUILD_OUTPUT),, \
168 $(error failed to create output directory "$(saved-output)"))
170 PHONY += $(MAKECMDGOALS) sub-make
172 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
175 # Fake the "Entering directory" message once, so that IDEs/editors are
176 # able to understand relative filenames.
178 quiet_echodir := @echo
181 $($(quiet)echodir) "make[1]: Entering directory \`$(KBUILD_OUTPUT)'"
182 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
183 KBUILD_SRC=$(CURDIR) \
184 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
185 $(filter-out _all sub-make,$(MAKECMDGOALS))
187 # Leave processing to above invocation of make
189 endif # ifneq ($(KBUILD_OUTPUT),)
190 endif # ifeq ($(KBUILD_SRC),)
192 # We process the rest of the Makefile if this is the final invocation of make
193 ifeq ($(skip-makefile),)
195 # If building an external module we do not care about the all: rule
196 # but instead _all depend on modules
198 ifeq ($(KBUILD_EXTMOD),)
204 ifeq ($(KBUILD_SRC),)
205 # building in the source tree
208 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
209 # building in a subdirectory of the source tree
212 srctree := $(KBUILD_SRC)
219 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
221 export srctree objtree VPATH
224 # SUBARCH tells the usermode build what the underlying arch is. That is set
225 # first, and if a usermode build is happening, the "ARCH=um" on the command
226 # line overrides the setting of ARCH below. If a native build is happening,
227 # then ARCH is assigned, getting whatever value it gets normally, and
228 # SUBARCH is subsequently ignored.
230 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
231 -e s/sun4u/sparc64/ \
232 -e s/arm.*/arm/ -e s/sa110/arm/ \
233 -e s/s390x/s390/ -e s/parisc64/parisc/ \
234 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
235 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
237 # Cross compiling and selecting different set of gcc/bin-utils
238 # ---------------------------------------------------------------------------
240 # When performing cross compilation for other architectures ARCH shall be set
241 # to the target architecture. (See arch/* for the possibilities).
242 # ARCH can be set during invocation of make:
244 # Another way is to have ARCH set in the environment.
245 # The default ARCH is the host where make is executed.
247 # CROSS_COMPILE specify the prefix used for all executables used
248 # during compilation. Only gcc and related bin-utils executables
249 # are prefixed with $(CROSS_COMPILE).
250 # CROSS_COMPILE can be set on the command line
251 # make CROSS_COMPILE=ia64-linux-
252 # Alternatively CROSS_COMPILE can be set in the environment.
253 # A third alternative is to store a setting in .config so that plain
254 # "make" in the configured kernel build directory always uses that.
255 # Default value for CROSS_COMPILE is not to prefix executables
256 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
258 CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
260 # Architecture as present in compile.h
261 UTS_MACHINE := $(ARCH)
264 # Additional ARCH settings for x86
268 ifeq ($(ARCH),x86_64)
272 # Additional ARCH settings for sparc
273 ifeq ($(ARCH),sparc32)
276 ifeq ($(ARCH),sparc64)
280 # Additional ARCH settings for sh
285 # Additional ARCH settings for tile
286 ifeq ($(ARCH),tilepro)
289 ifeq ($(ARCH),tilegx)
293 # Where to locate arch specific headers
294 hdr-arch := $(SRCARCH)
296 KCONFIG_CONFIG ?= .config
297 export KCONFIG_CONFIG
299 # SHELL used by kbuild
300 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
301 else if [ -x /bin/bash ]; then echo /bin/bash; \
302 else echo sh; fi ; fi)
306 HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
309 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
310 HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
311 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
314 # Decide whether to build built-in, modular, or both.
315 # Normally, just do built-in.
320 # If we have only "make modules", don't compile built-in objects.
321 # When we're building modules with modversions, we need to consider
322 # the built-in objects during the descend as well, in order to
323 # make sure the checksums are up to date before we record them.
325 ifeq ($(MAKECMDGOALS),modules)
326 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
329 # If we have "make <whatever> modules", compile modules
330 # in addition to whatever we do anyway.
331 # Just "make" or "make all" shall build modules as well
333 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
337 ifeq ($(MAKECMDGOALS),)
341 export KBUILD_MODULES KBUILD_BUILTIN
342 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
345 ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1)
353 # Look for make include files relative to root of kernel src
354 MAKEFLAGS += --include-dir=$(srctree)
356 # We need some generic definitions (do not try to remake the file).
357 $(srctree)/scripts/Kbuild.include: ;
358 include $(srctree)/scripts/Kbuild.include
360 # Make variables (CC, etc...)
361 AS = $(CROSS_COMPILE)as
362 LD = $(CROSS_COMPILE)ld
363 CC = $(CROSS_COMPILE)gcc
365 AR = $(CROSS_COMPILE)ar
366 NM = $(CROSS_COMPILE)nm
367 STRIP = $(CROSS_COMPILE)strip
368 OBJCOPY = $(CROSS_COMPILE)objcopy
369 OBJDUMP = $(CROSS_COMPILE)objdump
371 GENKSYMS = scripts/genksyms/genksyms
372 INSTALLKERNEL := installkernel
373 DEPMOD = /sbin/depmod
378 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
379 -Wbitwise -Wno-return-void $(CF)
385 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
388 # Use USERINCLUDE when you must reference the UAPI directories only.
390 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
391 -Iarch/$(hdr-arch)/include/generated/uapi \
392 -I$(srctree)/include/uapi \
393 -Iinclude/generated/uapi \
394 -include $(srctree)/include/linux/kconfig.h
396 # Use LINUXINCLUDE when you must reference the include/ directory.
397 # Needed to be compatible with the O= option
399 -I$(srctree)/arch/$(hdr-arch)/include \
400 -Iarch/$(hdr-arch)/include/generated \
401 $(if $(KBUILD_SRC), -I$(srctree)/include) \
405 KBUILD_CPPFLAGS := -D__KERNEL__
407 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
408 -fno-strict-aliasing -fno-common \
409 -Werror-implicit-function-declaration \
412 KBUILD_AFLAGS_KERNEL :=
413 KBUILD_CFLAGS_KERNEL :=
414 KBUILD_AFLAGS := -D__ASSEMBLY__
415 KBUILD_AFLAGS_MODULE := -DMODULE
416 KBUILD_CFLAGS_MODULE := -DMODULE
417 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
419 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
420 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
421 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
423 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
424 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
425 export CPP AR NM STRIP OBJCOPY OBJDUMP
426 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
427 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
429 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
430 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
431 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
432 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
433 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
434 export KBUILD_ARFLAGS
436 # When compiling out-of-tree modules, put MODVERDIR in the module
437 # tree rather than in the kernel tree. The kernel tree might
439 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
441 # Files to ignore in find ... statements
443 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
444 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
446 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
447 --exclude CVS --exclude .pc --exclude .hg --exclude .git
449 # ===========================================================================
450 # Rules shared between *config targets and build targets
452 # Basic helpers built in scripts/
453 PHONY += scripts_basic
455 $(Q)$(MAKE) $(build)=scripts/basic
456 $(Q)rm -f .tmp_quiet_recordmcount
458 # To avoid any implicit rule to kick in, define an empty command.
459 scripts/basic/%: scripts_basic ;
461 PHONY += outputmakefile
462 # outputmakefile generates a Makefile in the output directory, if using a
463 # separate output directory. This allows convenient use of make in the
466 ifneq ($(KBUILD_SRC),)
467 $(Q)ln -fsn $(srctree) source
468 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
469 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
472 # Support for using generic headers in asm-generic
475 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
476 src=asm obj=arch/$(SRCARCH)/include/generated/asm
477 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
478 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
480 # To make sure we do not include .config for any of the *config targets
481 # catch them early, and hand them over to scripts/kconfig/Makefile
482 # It is allowed to specify more targets when calling make, including
483 # mixing *config targets and build targets.
484 # For example 'make oldconfig all'.
485 # Detect when mixed targets is specified, and make a second invocation
486 # of make so .config is not included in this case either (for *config).
488 version_h := include/generated/uapi/linux/version.h
490 no-dot-config-targets := clean mrproper distclean \
491 cscope gtags TAGS tags help %docs check% coccicheck \
492 $(version_h) headers_% archheaders archscripts \
493 kernelversion %src-pkg
499 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
500 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
505 ifeq ($(KBUILD_EXTMOD),)
506 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
508 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
514 ifeq ($(mixed-targets),1)
515 # ===========================================================================
516 # We're called with mixed targets (*config and build targets).
517 # Handle them one by one.
519 PHONY += $(MAKECMDGOALS) __build_one_by_one
521 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
526 for i in $(MAKECMDGOALS); do \
527 $(MAKE) -f $(srctree)/Makefile $$i; \
531 ifeq ($(config-targets),1)
532 # ===========================================================================
533 # *config targets only - make sure prerequisites are updated, and descend
534 # in scripts/kconfig to make the *config target
536 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
537 # KBUILD_DEFCONFIG may point out an alternative default configuration
538 # used for 'make defconfig'
539 include $(srctree)/arch/$(SRCARCH)/Makefile
540 export KBUILD_DEFCONFIG KBUILD_KCONFIG
542 config: scripts_basic outputmakefile FORCE
543 $(Q)$(MAKE) $(build)=scripts/kconfig $@
545 %config: scripts_basic outputmakefile FORCE
546 $(Q)$(MAKE) $(build)=scripts/kconfig $@
549 # ===========================================================================
550 # Build targets only - this includes vmlinux, arch specific targets, clean
551 # targets and others. In general all targets except *config targets.
553 ifeq ($(KBUILD_EXTMOD),)
554 # Additional helpers built in scripts/
555 # Carefully list dependencies so we do not try to build scripts twice
558 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
560 $(Q)$(MAKE) $(build)=$(@)
562 # Objects we will link into vmlinux / subdirs we need to visit
564 drivers-y := drivers/ sound/ firmware/
568 endif # KBUILD_EXTMOD
570 ifeq ($(dot-config),1)
572 -include include/config/auto.conf
574 ifeq ($(KBUILD_EXTMOD),)
575 # Read in dependencies to all Kconfig* files, make sure to run
576 # oldconfig if changes are detected.
577 -include include/config/auto.conf.cmd
579 # To avoid any implicit rule to kick in, define an empty command
580 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
582 # If .config is newer than include/config/auto.conf, someone tinkered
583 # with it and forgot to run make oldconfig.
584 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
585 # we execute the config step to be sure to catch updated Kconfig files
586 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
587 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
589 # external modules needs include/generated/autoconf.h and include/config/auto.conf
590 # but do not care if they are up-to-date. Use auto.conf to trigger the test
591 PHONY += include/config/auto.conf
593 include/config/auto.conf:
594 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
596 echo >&2 " ERROR: Kernel configuration is invalid."; \
597 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
598 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
602 endif # KBUILD_EXTMOD
605 # Dummy target needed, because used as prerequisite
606 include/config/auto.conf: ;
607 endif # $(dot-config)
609 # The all: target is the default when no target is given on the
611 # This allow a user to issue only 'make' to build a kernel including modules
612 # Defaults to vmlinux, but the arch makefile usually adds further targets
615 include $(srctree)/arch/$(SRCARCH)/Makefile
617 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
619 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
620 KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
625 # Tell gcc to never replace conditional load with a non-conditional one
626 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
628 ifdef CONFIG_READABLE_ASM
629 # Disable optimizations that make assembler listings hard to read.
630 # reorder blocks reorders the control in the function
631 # ipa clone creates specialized cloned functions
632 # partial inlining inlines only parts of functions
633 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
634 $(call cc-option,-fno-ipa-cp-clone,) \
635 $(call cc-option,-fno-partial-inlining)
638 ifneq ($(CONFIG_FRAME_WARN),0)
639 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
642 # Handle stack protector mode.
644 # Since kbuild can potentially perform two passes (first with the old
645 # .config values and then with updated .config values), we cannot error out
646 # if a desired compiler option is unsupported. If we were to error, kbuild
647 # could never get to the second pass and actually notice that we changed
648 # the option to something that was supported.
650 # Additionally, we don't want to fallback and/or silently change which compiler
651 # flags will be used, since that leads to producing kernels with different
652 # security feature characteristics depending on the compiler used. ("But I
653 # selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
655 # The middle ground is to warn here so that the failed option is obvious, but
656 # to let the build fail with bad compiler flags so that we can't produce a
657 # kernel when there is a CONFIG and compiler mismatch.
659 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
660 stackp-flag := -fstack-protector
661 ifeq ($(call cc-option, $(stackp-flag)),)
662 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
663 -fstack-protector not supported by compiler)
666 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
667 stackp-flag := -fstack-protector-strong
668 ifeq ($(call cc-option, $(stackp-flag)),)
669 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
670 -fstack-protector-strong not supported by compiler)
673 # Force off for distro compilers that enable stack protector by default.
674 stackp-flag := $(call cc-option, -fno-stack-protector)
677 KBUILD_CFLAGS += $(stackp-flag)
679 ifeq ($(COMPILER),clang)
680 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
681 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
682 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
683 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
684 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
685 # Quiet clang warning: comparison of unsigned expression < 0 is always false
686 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
687 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
688 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
689 # See modpost pattern 2
690 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
691 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
694 # This warning generated too much noise in a regular build.
695 # Use make W=1 to enable this warning (see scripts/Makefile.build)
696 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
699 ifdef CONFIG_FRAME_POINTER
700 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
702 # Some targets (ARM with Thumb2, for example), can't be built with frame
703 # pointers. For those, we don't have FUNCTION_TRACER automatically
704 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
705 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
706 # -fomit-frame-pointer with FUNCTION_TRACER.
707 ifndef CONFIG_FUNCTION_TRACER
708 KBUILD_CFLAGS += -fomit-frame-pointer
712 KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
714 ifdef CONFIG_DEBUG_INFO
715 ifdef CONFIG_DEBUG_INFO_SPLIT
716 KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
720 KBUILD_AFLAGS += -Wa,-gdwarf-2
722 ifdef CONFIG_DEBUG_INFO_DWARF4
723 KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
726 ifdef CONFIG_DEBUG_INFO_REDUCED
727 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
728 $(call cc-option,-fno-var-tracking)
731 ifdef CONFIG_FUNCTION_TRACER
732 ifdef CONFIG_HAVE_FENTRY
733 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
735 KBUILD_CFLAGS += -pg $(CC_USING_FENTRY)
736 KBUILD_AFLAGS += $(CC_USING_FENTRY)
737 ifdef CONFIG_DYNAMIC_FTRACE
738 ifdef CONFIG_HAVE_C_RECORDMCOUNT
739 BUILD_C_RECORDMCOUNT := y
740 export BUILD_C_RECORDMCOUNT
745 # We trigger additional mismatches with less inlining
746 ifdef CONFIG_DEBUG_SECTION_MISMATCH
747 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
750 # arch Makefile may override CC so keep this after arch Makefile is included
751 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
752 CHECKFLAGS += $(NOSTDINC_FLAGS)
754 # warn about C99 declaration after statement
755 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
757 # disable pointer signed / unsigned warnings in gcc 4.0
758 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
760 # disable invalid "can't wrap" optimizations for signed / pointers
761 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
763 # conserve stack if available
764 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
766 # disallow errors like 'EXPORT_GPL(foo);' with missing header
767 KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
769 # require functions to have arguments in prototypes, not empty 'int foo()'
770 KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
772 # Prohibit date/time macros, which would make the build non-deterministic
773 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
775 # use the deterministic mode of AR if available
776 KBUILD_ARFLAGS := $(call ar-option,D)
778 # check for 'asm goto'
779 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
780 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
783 include $(srctree)/scripts/Makefile.extrawarn
785 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
786 KBUILD_CPPFLAGS += $(KCPPFLAGS)
787 KBUILD_AFLAGS += $(KAFLAGS)
788 KBUILD_CFLAGS += $(KCFLAGS)
790 # Use --build-id when available.
791 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
792 $(call cc-ldoption, -Wl$(comma)--build-id,))
793 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
794 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
796 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
797 LDFLAGS_vmlinux += $(call ld-option, -X,)
800 # Default kernel image to build when no specific target is given.
801 # KBUILD_IMAGE may be overruled on the command line or
802 # set in the environment
803 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
805 export KBUILD_IMAGE ?= vmlinux
808 # INSTALL_PATH specifies where to place the updated kernel and system map
809 # images. Default is /boot, but you can set it to other values
810 export INSTALL_PATH ?= /boot
813 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
814 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
815 # an argument if needed. Otherwise it defaults to the kernel install path
817 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
820 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
821 # relocations required by build roots. This is not defined in the
822 # makefile but the argument can be passed to make if needed.
825 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
829 # INSTALL_MOD_STRIP, if defined, will cause modules to be
830 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
831 # the default option --strip-debug will be used. Otherwise,
832 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
834 ifdef INSTALL_MOD_STRIP
835 ifeq ($(INSTALL_MOD_STRIP),1)
836 mod_strip_cmd = $(STRIP) --strip-debug
838 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
839 endif # INSTALL_MOD_STRIP=1
842 endif # INSTALL_MOD_STRIP
845 # Select initial ramdisk compression format, default is gzip(1).
846 # This shall be used by the dracut(8) tool while creating an initramfs image.
848 INITRD_COMPRESS-y := gzip
849 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
850 INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
851 INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
852 INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
853 INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
854 # do not export INITRD_COMPRESS, since we didn't actually
855 # choose a sane default compression above.
856 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
858 ifdef CONFIG_MODULE_SIG_ALL
859 MODSECKEY = ./signing_key.priv
860 MODPUBKEY = ./signing_key.x509
862 mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
869 ifeq ($(KBUILD_EXTMOD),)
870 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
872 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
873 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
874 $(net-y) $(net-m) $(libs-y) $(libs-m)))
876 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
878 $(core-n) $(core-) $(drivers-n) $(drivers-) \
879 $(net-n) $(net-) $(libs-n) $(libs-))))
881 init-y := $(patsubst %/, %/built-in.o, $(init-y))
882 core-y := $(patsubst %/, %/built-in.o, $(core-y))
883 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
884 net-y := $(patsubst %/, %/built-in.o, $(net-y))
885 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
886 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
887 libs-y := $(libs-y1) $(libs-y2)
889 # Externally visible symbols (used by link-vmlinux.sh)
890 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
891 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
892 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
893 export LDFLAGS_vmlinux
894 # used by scripts/pacmage/Makefile
895 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
897 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
899 # Final link of vmlinux
900 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
901 quiet_cmd_link-vmlinux = LINK $@
903 # Include targets which we want to
904 # execute if the rest of the kernel build went well.
905 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
906 ifdef CONFIG_HEADERS_CHECK
907 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
910 $(Q)$(MAKE) $(build)=samples
912 ifdef CONFIG_BUILD_DOCSRC
913 $(Q)$(MAKE) $(build)=Documentation
915 +$(call if_changed,link-vmlinux)
917 # The actual objects are generated when descending,
918 # make sure no implicit rule kicks in
919 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
921 # Handle descending into subdirectories listed in $(vmlinux-dirs)
922 # Preset locale variables to speed up the build process. Limit locale
923 # tweaks to this spot to avoid wrong language settings when running
924 # make menuconfig etc.
925 # Error messages still appears in the original language
927 PHONY += $(vmlinux-dirs)
928 $(vmlinux-dirs): prepare scripts
929 $(Q)$(MAKE) $(build)=$@
931 define filechk_kernel.release
932 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
935 # Store (new) KERNELRELEASE string in include/config/kernel.release
936 include/config/kernel.release: include/config/auto.conf FORCE
937 $(call filechk,kernel.release)
940 # Things we need to do before we recursively start building the kernel
941 # or the modules are listed in "prepare".
942 # A multi level approach is used. prepareN is processed before prepareN-1.
943 # archprepare is used in arch Makefiles and when processed asm symlink,
944 # version.h and scripts_basic is processed / created.
946 # Listed in dependency order
947 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
949 # prepare3 is used to check if we are building in a separate output directory,
951 # 1) Check that make has not been executed in the kernel src $(srctree)
952 prepare3: include/config/kernel.release
953 ifneq ($(KBUILD_SRC),)
954 @$(kecho) ' Using $(srctree) as source for kernel'
955 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
956 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
957 echo >&2 " in the '$(srctree)' directory.";\
962 # prepare2 creates a makefile if using a separate output directory
963 prepare2: prepare3 outputmakefile asm-generic
965 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
966 include/config/auto.conf
969 archprepare: archheaders archscripts prepare1 scripts_basic
971 prepare0: archprepare FORCE
972 $(Q)$(MAKE) $(build)=.
974 # All the preparing..
977 # Generate some files
978 # ---------------------------------------------------------------------------
980 # KERNELRELEASE can change from a few different places, meaning version.h
981 # needs to be updated, so this check is forced on all builds
984 define filechk_utsrelease.h
985 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
986 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
989 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
992 define filechk_version.h
993 (echo \#define LINUX_VERSION_CODE $(shell \
994 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
995 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
998 $(version_h): $(srctree)/Makefile FORCE
999 $(call filechk,version.h)
1001 include/generated/utsrelease.h: include/config/kernel.release FORCE
1002 $(call filechk,utsrelease.h)
1006 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1007 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1009 # ---------------------------------------------------------------------------
1013 @echo '*** Warning: make $@ is unnecessary now.'
1015 # ---------------------------------------------------------------------------
1017 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1018 export INSTALL_FW_PATH
1020 PHONY += firmware_install
1021 firmware_install: FORCE
1022 @mkdir -p $(objtree)/firmware
1023 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1025 # ---------------------------------------------------------------------------
1028 #Default location for installed headers
1029 export INSTALL_HDR_PATH = $(objtree)/usr
1031 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1033 # If we do an all arch process set dst to asm-$(hdr-arch)
1034 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1036 PHONY += archheaders
1039 PHONY += archscripts
1043 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1044 $(Q)$(MAKE) $(build)=scripts build_unifdef
1046 PHONY += headers_install_all
1047 headers_install_all:
1048 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1050 PHONY += headers_install
1051 headers_install: __headers
1052 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1053 $(error Headers not exportable for the $(SRCARCH) architecture))
1054 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1055 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1057 PHONY += headers_check_all
1058 headers_check_all: headers_install_all
1059 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1061 PHONY += headers_check
1062 headers_check: headers_install
1063 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1064 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1066 # ---------------------------------------------------------------------------
1071 $(Q)$(MAKE) -C tools/testing/selftests run_tests
1073 # ---------------------------------------------------------------------------
1076 ifdef CONFIG_MODULES
1078 # By default, build modules as well
1084 # A module can be listed more than once in obj-m resulting in
1085 # duplicate lines in modules.order files. Those are removed
1086 # using awk while concatenating to the final file.
1089 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1090 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1091 @$(kecho) ' Building modules, stage 2.';
1092 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1093 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1095 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1096 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1098 %/modules.builtin: include/config/auto.conf
1099 $(Q)$(MAKE) $(modbuiltin)=$*
1102 # Target to prepare building external modules
1103 PHONY += modules_prepare
1104 modules_prepare: prepare scripts
1106 # Target to install modules
1107 PHONY += modules_install
1108 modules_install: _modinst_ _modinst_post
1112 @rm -rf $(MODLIB)/kernel
1113 @rm -f $(MODLIB)/source
1114 @mkdir -p $(MODLIB)/kernel
1115 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1116 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1117 rm -f $(MODLIB)/build ; \
1118 ln -s $(CURDIR) $(MODLIB)/build ; \
1120 @cp -f $(objtree)/modules.order $(MODLIB)/
1121 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1122 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1124 # This depmod is only for convenience to give the initial
1125 # boot a modules.dep even before / is mounted read-write. However the
1126 # boot script depmod is the master version.
1127 PHONY += _modinst_post
1128 _modinst_post: _modinst_
1129 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1132 ifeq ($(CONFIG_MODULE_SIG), y)
1133 PHONY += modules_sign
1135 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1138 else # CONFIG_MODULES
1140 # Modules not configured
1141 # ---------------------------------------------------------------------------
1143 modules modules_install: FORCE
1145 @echo >&2 "The present kernel configuration has modules disabled."
1146 @echo >&2 "Type 'make config' and enable loadable module support."
1147 @echo >&2 "Then build a kernel with module support enabled."
1151 endif # CONFIG_MODULES
1154 # Cleaning is done on three levels.
1155 # make clean Delete most generated files
1156 # Leave enough to build external modules
1157 # make mrproper Delete the current configuration, and all generated files
1158 # make distclean Remove editor backup files, patch leftover files and the like
1160 # Directories & files removed with 'make clean'
1161 CLEAN_DIRS += $(MODVERDIR)
1163 # Directories & files removed with 'make mrproper'
1164 MRPROPER_DIRS += include/config usr/include include/generated \
1165 arch/*/include/generated .tmp_objdiff
1166 MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1167 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1168 signing_key.priv signing_key.x509 x509.genkey \
1169 extra_certificates signing_key.x509.keyid \
1170 signing_key.x509.signer include/linux/version.h
1172 # clean - Delete most, but leave enough to build external modules
1174 clean: rm-dirs := $(CLEAN_DIRS)
1175 clean: rm-files := $(CLEAN_FILES)
1176 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1178 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1180 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1183 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1185 clean: archclean vmlinuxclean
1187 # mrproper - Delete all generated files, including .config
1189 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1190 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1191 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1193 PHONY += $(mrproper-dirs) mrproper archmrproper
1195 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1197 mrproper: clean archmrproper $(mrproper-dirs)
1206 @find $(srctree) $(RCS_FIND_IGNORE) \
1207 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1208 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1209 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
1210 -type f -print | xargs rm -f
1213 # Packaging of the kernel to various formats
1214 # ---------------------------------------------------------------------------
1215 # rpm target kept for backward compatibility
1216 package-dir := scripts/package
1219 $(Q)$(MAKE) $(build)=$(package-dir) $@
1220 %pkg: include/config/kernel.release FORCE
1221 $(Q)$(MAKE) $(build)=$(package-dir) $@
1222 rpm: include/config/kernel.release FORCE
1223 $(Q)$(MAKE) $(build)=$(package-dir) $@
1226 # Brief documentation of the typical targets used
1227 # ---------------------------------------------------------------------------
1229 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1230 boards := $(notdir $(boards))
1231 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1232 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1235 @echo 'Cleaning targets:'
1236 @echo ' clean - Remove most generated files but keep the config and'
1237 @echo ' enough build support to build external modules'
1238 @echo ' mrproper - Remove all generated files + config + various backup files'
1239 @echo ' distclean - mrproper + remove editor backup and patch files'
1241 @echo 'Configuration targets:'
1242 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1244 @echo 'Other generic targets:'
1245 @echo ' all - Build all targets marked with [*]'
1246 @echo '* vmlinux - Build the bare kernel'
1247 @echo '* modules - Build all modules'
1248 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1249 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1250 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1251 @echo ' dir/ - Build all files in dir and below'
1252 @echo ' dir/file.[oisS] - Build specified target only'
1253 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1254 @echo ' (requires a recent binutils and recent build (System.map))'
1255 @echo ' dir/file.ko - Build module including final link'
1256 @echo ' modules_prepare - Set up for building external modules'
1257 @echo ' tags/TAGS - Generate tags file for editors'
1258 @echo ' cscope - Generate cscope index'
1259 @echo ' gtags - Generate GNU GLOBAL index'
1260 @echo ' kernelrelease - Output the release version string (use with make -s)'
1261 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1262 @echo ' image_name - Output the image name (use with make -s)'
1263 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1264 echo ' (default: $(INSTALL_HDR_PATH))'; \
1266 @echo 'Static analysers'
1267 @echo ' checkstack - Generate a list of stack hogs'
1268 @echo ' namespacecheck - Name space analysis on compiled kernel'
1269 @echo ' versioncheck - Sanity check on version.h usage'
1270 @echo ' includecheck - Check for duplicate included header files'
1271 @echo ' export_report - List the usages of all exported symbols'
1272 @echo ' headers_check - Sanity check on exported headers'
1273 @echo ' headerdep - Detect inclusion cycles in headers'
1274 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1276 @echo 'Kernel selftest'
1277 @echo ' kselftest - Build and run kernel selftest (run as root)'
1278 @echo ' Build, install, and boot kernel before'
1279 @echo ' running kselftest on it'
1281 @echo 'Kernel packaging:'
1282 @$(MAKE) $(build)=$(package-dir) help
1284 @echo 'Documentation targets:'
1285 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1287 @echo 'Architecture specific targets ($(SRCARCH)):'
1288 @$(if $(archhelp),$(archhelp),\
1289 echo ' No architecture specific help defined for $(SRCARCH)')
1292 $(foreach b, $(boards), \
1293 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1295 @$(if $(board-dirs), \
1296 $(foreach b, $(board-dirs), \
1297 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1298 printf " %-16s - Show all of the above\\n" help-boards; \
1301 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1302 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1303 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1304 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1305 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1306 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1307 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1308 @echo ' 1: warnings which may be relevant and do not occur too often'
1309 @echo ' 2: warnings which occur quite often but may still be relevant'
1310 @echo ' 3: more obscure warnings, can most likely be ignored'
1311 @echo ' Multiple levels can be combined with W=12 or W=123'
1313 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1314 @echo 'For further info see the ./README file'
1317 help-board-dirs := $(addprefix help-,$(board-dirs))
1319 help-boards: $(help-board-dirs)
1321 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1323 $(help-board-dirs): help-%:
1324 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1325 @$(if $(boards-per-dir), \
1326 $(foreach b, $(boards-per-dir), \
1327 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1331 # Documentation targets
1332 # ---------------------------------------------------------------------------
1333 %docs: scripts_basic FORCE
1334 $(Q)$(MAKE) $(build)=scripts build_docproc
1335 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1337 else # KBUILD_EXTMOD
1340 # External module support.
1341 # When building external modules the kernel used as basis is considered
1342 # read-only, and no consistency checks are made and the make
1343 # system is not used on the basis kernel. If updates are required
1344 # in the basis kernel ordinary make commands (without M=...) must
1347 # The following are the only valid targets when building external
1349 # make M=dir clean Delete all automatically generated files
1350 # make M=dir modules Make all modules in specified dir
1351 # make M=dir Same as 'make M=dir modules'
1352 # make M=dir modules_install
1353 # Install the modules built in the module directory
1354 # Assumes install directory is already created
1356 # We are always building modules
1358 PHONY += crmodverdir
1362 PHONY += $(objtree)/Module.symvers
1363 $(objtree)/Module.symvers:
1364 @test -e $(objtree)/Module.symvers || ( \
1366 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1367 echo " is missing; modules will have no dependencies and modversions."; \
1370 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1371 PHONY += $(module-dirs) modules
1372 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1373 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1375 modules: $(module-dirs)
1376 @$(kecho) ' Building modules, stage 2.';
1377 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1379 PHONY += modules_install
1380 modules_install: _emodinst_ _emodinst_post
1382 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1385 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1386 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1388 PHONY += _emodinst_post
1389 _emodinst_post: _emodinst_
1392 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1394 PHONY += $(clean-dirs) clean
1396 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1398 clean: rm-dirs := $(MODVERDIR)
1399 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1402 @echo ' Building external modules.'
1403 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1405 @echo ' modules - default target, build the module(s)'
1406 @echo ' modules_install - install the module'
1407 @echo ' clean - remove generated files in module directory only'
1411 PHONY += prepare scripts
1414 endif # KBUILD_EXTMOD
1416 clean: $(clean-dirs)
1419 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1420 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1423 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1424 -o -name '*.symtypes' -o -name 'modules.order' \
1425 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1426 -o -name '*.gcno' \) -type f -print | xargs rm -f
1428 # Generate tags for editors
1429 # ---------------------------------------------------------------------------
1430 quiet_cmd_tags = GEN $@
1431 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1433 tags TAGS cscope gtags: FORCE
1436 # Scripts to check various things for consistency
1437 # ---------------------------------------------------------------------------
1439 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1442 find $(srctree)/* $(RCS_FIND_IGNORE) \
1443 -name '*.[hcS]' -type f -print | sort \
1444 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1447 find $(srctree)/* $(RCS_FIND_IGNORE) \
1448 -name '*.[hcS]' -type f -print | sort \
1449 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1452 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1455 $(PERL) $(srctree)/scripts/namespace.pl
1458 $(PERL) $(srctree)/scripts/export_report.pl
1460 endif #ifeq ($(config-targets),1)
1461 endif #ifeq ($(mixed-targets),1)
1463 PHONY += checkstack kernelrelease kernelversion image_name
1465 # UML needs a little special treatment here. It wants to use the host
1466 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1467 # else wants $(ARCH), including people doing cross-builds, which means
1468 # that $(SUBARCH) doesn't work here.
1470 CHECKSTACK_ARCH := $(SUBARCH)
1472 CHECKSTACK_ARCH := $(ARCH)
1475 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1476 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1479 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1482 @echo $(KERNELVERSION)
1485 @echo $(KBUILD_IMAGE)
1487 # Clear a bunch of variables before executing the submake
1489 $(Q)mkdir -p $(objtree)/tools
1490 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1493 $(Q)mkdir -p $(objtree)/tools
1494 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1497 # ---------------------------------------------------------------------------
1498 # Single targets are compatible with:
1499 # - build with mixed source and output
1500 # - build with separate output dir 'make O=...'
1501 # - external modules
1503 # target-dir => where to store outputfile
1504 # build-dir => directory in kernel source tree to use
1506 ifeq ($(KBUILD_EXTMOD),)
1507 build-dir = $(patsubst %/,%,$(dir $@))
1508 target-dir = $(dir $@)
1510 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1511 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1512 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1515 %.s: %.c prepare scripts FORCE
1516 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1517 %.i: %.c prepare scripts FORCE
1518 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1519 %.o: %.c prepare scripts FORCE
1520 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1521 %.lst: %.c prepare scripts FORCE
1522 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1523 %.s: %.S prepare scripts FORCE
1524 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1525 %.o: %.S prepare scripts FORCE
1526 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1527 %.symtypes: %.c prepare scripts FORCE
1528 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1531 /: prepare scripts FORCE
1533 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1534 $(build)=$(build-dir)
1535 # Make sure the latest headers are built for Documentation
1536 Documentation/: headers_install
1537 %/: prepare scripts FORCE
1539 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1540 $(build)=$(build-dir)
1541 %.ko: prepare scripts FORCE
1543 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1544 $(build)=$(build-dir) $(@:.ko=.o)
1545 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1547 # FIXME Should go into a make.lib or something
1548 # ===========================================================================
1550 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1551 cmd_rmdirs = rm -rf $(rm-dirs)
1553 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1554 cmd_rmfiles = rm -f $(rm-files)
1556 # Run depmod only if we have System.map and depmod is executable
1557 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1558 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1559 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1561 # Create temporary dir for module support files
1562 # clean it up only when building all modules
1563 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1564 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1566 # read all saved command lines
1568 targets := $(wildcard $(sort $(targets)))
1569 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1571 ifneq ($(cmd_files),)
1572 $(cmd_files): ; # Do not try to update included dependency files
1573 include $(cmd_files)
1576 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1578 # $(Q)$(MAKE) $(clean)=dir
1579 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1581 endif # skip-makefile
1586 # Declare the contents of the .PHONY variable as phony. We keep that
1587 # information in a variable so we can use it in if_changed and friends.