5 NAME = Blurry Fish Butt
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.
15 # o Do not use make's built-in rules and variables
16 # (this increases performance and avoids hard-to-debug behaviour);
17 # o Look for make include files relative to root of kernel src
18 MAKEFLAGS += -rR --include-dir=$(CURDIR)
20 # Avoid funny character set dependencies
24 export LC_COLLATE LC_NUMERIC
26 # Avoid interference with shell env settings
29 # We are using a recursive build, so we need to do a little thinking
30 # to get the ordering right.
32 # Most importantly: sub-Makefiles should only ever modify files in
33 # their own directory. If in some directory we have a dependency on
34 # a file in another dir (which doesn't happen often, but it's often
35 # unavoidable when linking the built-in.o targets which finally
36 # turn into vmlinux), we will call a sub make in that other dir, and
37 # after that we are sure that everything which is in that other dir
40 # The only cases where we need to modify files which have global
41 # effects are thus separated out and done before the recursive
42 # descending is started. They are now explicitly listed as the
46 # ---------------------------------------------------------------------------
48 # Normally, we echo the whole command before executing it. By making
49 # that echo $($(quiet)$(cmd)), we now have the possibility to set
50 # $(quiet) to choose other forms of output instead, e.g.
52 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
53 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
55 # If $(quiet) is empty, the whole command will be printed.
56 # If it is set to "quiet_", only the short version will be printed.
57 # If it is set to "silent_", nothing will be printed at all, since
58 # the variable $(silent_cmd_cc_o_c) doesn't exist.
60 # A simple variant is to prefix commands with $(Q) - that's useful
61 # for commands that shall be hidden in non-verbose mode.
65 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
66 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
68 # To put more focus on warnings, be less verbose as default
69 # Use 'make V=1' to see the full commands
71 ifeq ("$(origin V)", "command line")
78 ifeq ($(KBUILD_VERBOSE),1)
86 # If the user is running make -s (silent mode), suppress echoing of
89 ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
90 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
94 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
99 export quiet Q KBUILD_VERBOSE
101 # kbuild supports saving output files in a separate directory.
102 # To locate output files in a separate directory two syntaxes are supported.
103 # In both cases the working directory must be the root of the kernel src.
105 # Use "make O=dir/to/store/output/files/"
107 # 2) Set KBUILD_OUTPUT
108 # Set the environment variable KBUILD_OUTPUT to point to the directory
109 # where the output files shall be placed.
110 # export KBUILD_OUTPUT=dir/to/store/output/files/
113 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
116 # KBUILD_SRC is set on invocation of make in OBJ directory
117 # KBUILD_SRC is not intended to be used by the regular user (for now)
118 ifeq ($(KBUILD_SRC),)
120 # OK, Make called in directory where kernel src resides
121 # Do we want to locate output files in a separate directory?
122 ifeq ("$(origin O)", "command line")
123 KBUILD_OUTPUT := $(O)
126 # That's our default target when none is given on the command line
130 # Cancel implicit rules on top Makefile
131 $(CURDIR)/Makefile Makefile: ;
133 ifneq ($(KBUILD_OUTPUT),)
134 # Invoke a second make in the output directory, passing relevant variables
135 # check that the output directory actually exists
136 saved-output := $(KBUILD_OUTPUT)
137 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
139 $(if $(KBUILD_OUTPUT),, \
140 $(error failed to create output directory "$(saved-output)"))
142 PHONY += $(MAKECMDGOALS) sub-make
144 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
148 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
149 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
151 # Leave processing to above invocation of make
153 endif # ifneq ($(KBUILD_OUTPUT),)
154 endif # ifeq ($(KBUILD_SRC),)
156 # We process the rest of the Makefile if this is the final invocation of make
157 ifeq ($(skip-makefile),)
159 # Do not print "Entering directory ...",
160 # but we want to display it when entering to the output directory
161 # so that IDEs/editors are able to understand relative filenames.
162 MAKEFLAGS += --no-print-directory
164 # Call a source code checker (by default, "sparse") as part of the
167 # Use 'make C=1' to enable checking of only re-compiled files.
168 # Use 'make C=2' to enable checking of *all* source files, regardless
169 # of whether they are re-compiled or not.
171 # See the file "Documentation/sparse.txt" for more details, including
172 # where to get the "sparse" utility.
174 ifeq ("$(origin C)", "command line")
175 KBUILD_CHECKSRC = $(C)
177 ifndef KBUILD_CHECKSRC
181 # Use make M=dir to specify directory of external module to build
182 # Old syntax make ... SUBDIRS=$PWD is still supported
183 # Setting the environment variable KBUILD_EXTMOD take precedence
185 KBUILD_EXTMOD ?= $(SUBDIRS)
188 ifeq ("$(origin M)", "command line")
189 KBUILD_EXTMOD := $(M)
192 # If building an external module we do not care about the all: rule
193 # but instead _all depend on modules
195 ifeq ($(KBUILD_EXTMOD),)
201 ifeq ($(KBUILD_SRC),)
202 # building in the source tree
205 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
206 # building in a subdirectory of the source tree
209 srctree := $(KBUILD_SRC)
216 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
218 export srctree objtree VPATH
220 # SUBARCH tells the usermode build what the underlying arch is. That is set
221 # first, and if a usermode build is happening, the "ARCH=um" on the command
222 # line overrides the setting of ARCH below. If a native build is happening,
223 # then ARCH is assigned, getting whatever value it gets normally, and
224 # SUBARCH is subsequently ignored.
226 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
227 -e s/sun4u/sparc64/ \
228 -e s/arm.*/arm/ -e s/sa110/arm/ \
229 -e s/s390x/s390/ -e s/parisc64/parisc/ \
230 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
231 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
233 # Cross compiling and selecting different set of gcc/bin-utils
234 # ---------------------------------------------------------------------------
236 # When performing cross compilation for other architectures ARCH shall be set
237 # to the target architecture. (See arch/* for the possibilities).
238 # ARCH can be set during invocation of make:
240 # Another way is to have ARCH set in the environment.
241 # The default ARCH is the host where make is executed.
243 # CROSS_COMPILE specify the prefix used for all executables used
244 # during compilation. Only gcc and related bin-utils executables
245 # are prefixed with $(CROSS_COMPILE).
246 # CROSS_COMPILE can be set on the command line
247 # make CROSS_COMPILE=ia64-linux-
248 # Alternatively CROSS_COMPILE can be set in the environment.
249 # A third alternative is to store a setting in .config so that plain
250 # "make" in the configured kernel build directory always uses that.
251 # Default value for CROSS_COMPILE is not to prefix executables
252 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
256 ifneq ($(wildcard $(srctree)/../prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9),)
257 CROSS_COMPILE ?= $(srctree)/../prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9/bin/aarch64-linux-android-
260 CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
262 # Architecture as present in compile.h
263 UTS_MACHINE := $(ARCH)
266 # Additional ARCH settings for x86
270 ifeq ($(ARCH),x86_64)
274 # Additional ARCH settings for sparc
275 ifeq ($(ARCH),sparc32)
278 ifeq ($(ARCH),sparc64)
282 # Additional ARCH settings for sh
287 # Additional ARCH settings for tile
288 ifeq ($(ARCH),tilepro)
291 ifeq ($(ARCH),tilegx)
295 # Where to locate arch specific headers
296 hdr-arch := $(SRCARCH)
298 KCONFIG_CONFIG ?= .config
299 export KCONFIG_CONFIG
301 # SHELL used by kbuild
302 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
303 else if [ -x /bin/bash ]; then echo /bin/bash; \
304 else echo sh; fi ; fi)
308 HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
311 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
312 HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
313 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
316 # Decide whether to build built-in, modular, or both.
317 # Normally, just do built-in.
322 # If we have only "make modules", don't compile built-in objects.
323 # When we're building modules with modversions, we need to consider
324 # the built-in objects during the descend as well, in order to
325 # make sure the checksums are up to date before we record them.
327 ifeq ($(MAKECMDGOALS),modules)
328 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
331 # If we have "make <whatever> modules", compile modules
332 # in addition to whatever we do anyway.
333 # Just "make" or "make all" shall build modules as well
335 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
339 ifeq ($(MAKECMDGOALS),)
343 export KBUILD_MODULES KBUILD_BUILTIN
344 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
346 # We need some generic definitions (do not try to remake the file).
347 scripts/Kbuild.include: ;
348 include scripts/Kbuild.include
350 # Make variables (CC, etc...)
351 AS = $(CROSS_COMPILE)as
352 LD = $(CROSS_COMPILE)ld
353 CC = $(CROSS_COMPILE)gcc
355 AR = $(CROSS_COMPILE)ar
356 NM = $(CROSS_COMPILE)nm
357 STRIP = $(CROSS_COMPILE)strip
358 OBJCOPY = $(CROSS_COMPILE)objcopy
359 OBJDUMP = $(CROSS_COMPILE)objdump
361 GENKSYMS = scripts/genksyms/genksyms
362 INSTALLKERNEL := installkernel
363 DEPMOD = /sbin/depmod
368 # Use the wrapper for the compiler. This wrapper scans for new
369 # warnings and causes the build to stop upon encountering them.
370 ifneq ($(wildcard $(srctree)/scripts/gcc-wrapper.py),)
371 CC = $(srctree)/scripts/gcc-wrapper.py $(CROSS_COMPILE)gcc
374 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
375 -Wbitwise -Wno-return-void $(CF)
381 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
384 # Use USERINCLUDE when you must reference the UAPI directories only.
386 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
387 -Iarch/$(hdr-arch)/include/generated/uapi \
388 -I$(srctree)/include/uapi \
389 -Iinclude/generated/uapi \
390 -include $(srctree)/include/linux/kconfig.h
392 # Use LINUXINCLUDE when you must reference the include/ directory.
393 # Needed to be compatible with the O= option
395 -I$(srctree)/arch/$(hdr-arch)/include \
396 -Iarch/$(hdr-arch)/include/generated/uapi \
397 -Iarch/$(hdr-arch)/include/generated \
398 $(if $(KBUILD_SRC), -I$(srctree)/include) \
402 KBUILD_CPPFLAGS := -D__KERNEL__
404 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
405 -fno-strict-aliasing -fno-common \
406 -Werror-implicit-function-declaration \
407 -Wno-format-security \
410 KBUILD_AFLAGS_KERNEL :=
411 KBUILD_CFLAGS_KERNEL :=
412 KBUILD_AFLAGS := -D__ASSEMBLY__
413 KBUILD_AFLAGS_MODULE := -DMODULE
414 KBUILD_CFLAGS_MODULE := -DMODULE
415 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
417 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
418 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
419 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
421 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
422 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
423 export CPP AR NM STRIP OBJCOPY OBJDUMP
424 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
425 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
427 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
428 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KASAN
429 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
430 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
431 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
432 export KBUILD_ARFLAGS
434 # When compiling out-of-tree modules, put MODVERDIR in the module
435 # tree rather than in the kernel tree. The kernel tree might
437 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
439 # Files to ignore in find ... statements
441 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
442 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
444 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
445 --exclude CVS --exclude .pc --exclude .hg --exclude .git
447 # ===========================================================================
448 # Rules shared between *config targets and build targets
450 # Basic helpers built in scripts/
451 PHONY += scripts_basic
453 $(Q)$(MAKE) $(build)=scripts/basic
454 $(Q)rm -f .tmp_quiet_recordmcount
456 # To avoid any implicit rule to kick in, define an empty command.
457 scripts/basic/%: scripts_basic ;
459 PHONY += outputmakefile
460 # outputmakefile generates a Makefile in the output directory, if using a
461 # separate output directory. This allows convenient use of make in the
464 ifneq ($(KBUILD_SRC),)
465 $(Q)ln -fsn $(srctree) source
466 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
467 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
470 # Support for using generic headers in asm-generic
473 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
474 src=asm obj=arch/$(SRCARCH)/include/generated/asm
475 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
476 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
478 # To make sure we do not include .config for any of the *config targets
479 # catch them early, and hand them over to scripts/kconfig/Makefile
480 # It is allowed to specify more targets when calling make, including
481 # mixing *config targets and build targets.
482 # For example 'make oldconfig all'.
483 # Detect when mixed targets is specified, and make a second invocation
484 # of make so .config is not included in this case either (for *config).
486 version_h := include/generated/uapi/linux/version.h
487 old_version_h := include/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 ($(words $(MAKECMDGOALS)),1)
513 ifeq ($(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 arch/$(SRCARCH)/Makefile
539 export KBUILD_DEFCONFIG KBUILD_KCONFIG
541 config: scripts_basic outputmakefile FORCE
542 $(Q)$(MAKE) $(build)=scripts/kconfig $@
544 %config: scripts_basic outputmakefile FORCE
545 $(Q)$(MAKE) $(build)=scripts/kconfig $@
548 # ===========================================================================
549 # Build targets only - this includes vmlinux, arch specific targets, clean
550 # targets and others. In general all targets except *config targets.
552 ifeq ($(KBUILD_EXTMOD),)
553 # Additional helpers built in scripts/
554 # Carefully list dependencies so we do not try to build scripts twice
557 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
559 $(Q)$(MAKE) $(build)=$(@)
561 # Objects we will link into vmlinux / subdirs we need to visit
563 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 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
616 # values of the respective KBUILD_* variables
620 include arch/$(SRCARCH)/Makefile
622 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
624 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
625 KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
630 # Tell gcc to never replace conditional load with a non-conditional one
631 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
633 ifdef CONFIG_READABLE_ASM
634 # Disable optimizations that make assembler listings hard to read.
635 # reorder blocks reorders the control in the function
636 # ipa clone creates specialized cloned functions
637 # partial inlining inlines only parts of functions
638 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
639 $(call cc-option,-fno-ipa-cp-clone,) \
640 $(call cc-option,-fno-partial-inlining)
643 ifneq ($(CONFIG_FRAME_WARN),0)
644 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
647 # Handle stack protector mode.
649 # Since kbuild can potentially perform two passes (first with the old
650 # .config values and then with updated .config values), we cannot error out
651 # if a desired compiler option is unsupported. If we were to error, kbuild
652 # could never get to the second pass and actually notice that we changed
653 # the option to something that was supported.
655 # Additionally, we don't want to fallback and/or silently change which compiler
656 # flags will be used, since that leads to producing kernels with different
657 # security feature characteristics depending on the compiler used. ("But I
658 # selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
660 # The middle ground is to warn here so that the failed option is obvious, but
661 # to let the build fail with bad compiler flags so that we can't produce a
662 # kernel when there is a CONFIG and compiler mismatch.
664 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
665 stackp-flag := -fstack-protector
666 ifeq ($(call cc-option, $(stackp-flag)),)
667 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
668 -fstack-protector not supported by compiler)
671 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
672 stackp-flag := -fstack-protector-strong
673 ifeq ($(call cc-option, $(stackp-flag)),)
674 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
675 -fstack-protector-strong not supported by compiler)
678 # Force off for distro compilers that enable stack protector by default.
679 stackp-flag := $(call cc-option, -fno-stack-protector)
682 KBUILD_CFLAGS += $(stackp-flag)
684 ifeq ($(cc-name),clang)
685 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
686 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
687 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
688 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
689 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
690 # Quiet clang warning: comparison of unsigned expression < 0 is always false
691 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
692 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
693 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
694 # See modpost pattern 2
695 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
696 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
699 # This warning generated too much noise in a regular build.
700 # Use make W=1 to enable this warning (see scripts/Makefile.build)
701 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
704 ifdef CONFIG_FRAME_POINTER
705 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
707 # Some targets (ARM with Thumb2, for example), can't be built with frame
708 # pointers. For those, we don't have FUNCTION_TRACER automatically
709 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
710 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
711 # -fomit-frame-pointer with FUNCTION_TRACER.
712 ifndef CONFIG_FUNCTION_TRACER
713 KBUILD_CFLAGS += -fomit-frame-pointer
717 KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
719 ifdef CONFIG_DEBUG_INFO
720 ifdef CONFIG_DEBUG_INFO_SPLIT
721 KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
725 KBUILD_AFLAGS += -Wa,-gdwarf-2
727 ifdef CONFIG_DEBUG_INFO_DWARF4
728 KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
731 ifdef CONFIG_DEBUG_INFO_REDUCED
732 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
733 $(call cc-option,-fno-var-tracking)
736 ifdef CONFIG_FUNCTION_TRACER
737 ifndef CC_FLAGS_FTRACE
738 CC_FLAGS_FTRACE := -pg
740 export CC_FLAGS_FTRACE
741 ifdef CONFIG_HAVE_FENTRY
742 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
744 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
745 KBUILD_AFLAGS += $(CC_USING_FENTRY)
746 ifdef CONFIG_DYNAMIC_FTRACE
747 ifdef CONFIG_HAVE_C_RECORDMCOUNT
748 BUILD_C_RECORDMCOUNT := y
749 export BUILD_C_RECORDMCOUNT
754 # We trigger additional mismatches with less inlining
755 ifdef CONFIG_DEBUG_SECTION_MISMATCH
756 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
759 # arch Makefile may override CC so keep this after arch Makefile is included
760 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
761 CHECKFLAGS += $(NOSTDINC_FLAGS)
763 # warn about C99 declaration after statement
764 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
766 # disable pointer signed / unsigned warnings in gcc 4.0
767 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
769 # disable invalid "can't wrap" optimizations for signed / pointers
770 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
772 # conserve stack if available
773 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
775 # disallow errors like 'EXPORT_GPL(foo);' with missing header
776 KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
778 # require functions to have arguments in prototypes, not empty 'int foo()'
779 KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
781 # Prohibit date/time macros, which would make the build non-deterministic
782 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
784 # use the deterministic mode of AR if available
785 KBUILD_ARFLAGS := $(call ar-option,D)
787 # check for 'asm goto'
788 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
789 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
790 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
793 include scripts/Makefile.kasan
794 include scripts/Makefile.extrawarn
796 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
798 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
799 KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
800 KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
802 # Use --build-id when available.
803 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
804 $(call cc-ldoption, -Wl$(comma)--build-id,))
805 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
806 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
808 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
809 LDFLAGS_vmlinux += $(call ld-option, -X,)
812 # Default kernel image to build when no specific target is given.
813 # KBUILD_IMAGE may be overruled on the command line or
814 # set in the environment
815 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
817 export KBUILD_IMAGE ?= vmlinux
820 # INSTALL_PATH specifies where to place the updated kernel and system map
821 # images. Default is /boot, but you can set it to other values
822 export INSTALL_PATH ?= /boot
825 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
826 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
827 # an argument if needed. Otherwise it defaults to the kernel install path
829 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
832 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
833 # relocations required by build roots. This is not defined in the
834 # makefile but the argument can be passed to make if needed.
837 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
841 # INSTALL_MOD_STRIP, if defined, will cause modules to be
842 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
843 # the default option --strip-debug will be used. Otherwise,
844 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
846 ifdef INSTALL_MOD_STRIP
847 ifeq ($(INSTALL_MOD_STRIP),1)
848 mod_strip_cmd = $(STRIP) --strip-debug
850 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
851 endif # INSTALL_MOD_STRIP=1
854 endif # INSTALL_MOD_STRIP
857 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
858 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
859 # or CONFIG_MODULE_COMPRESS_XZ.
861 mod_compress_cmd = true
862 ifdef CONFIG_MODULE_COMPRESS
863 ifdef CONFIG_MODULE_COMPRESS_GZIP
864 mod_compress_cmd = gzip -n -f
865 endif # CONFIG_MODULE_COMPRESS_GZIP
866 ifdef CONFIG_MODULE_COMPRESS_XZ
867 mod_compress_cmd = xz -f
868 endif # CONFIG_MODULE_COMPRESS_XZ
869 endif # CONFIG_MODULE_COMPRESS
870 export mod_compress_cmd
872 # Select initial ramdisk compression format, default is gzip(1).
873 # This shall be used by the dracut(8) tool while creating an initramfs image.
875 INITRD_COMPRESS-y := gzip
876 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
877 INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
878 INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
879 INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
880 INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
881 # do not export INITRD_COMPRESS, since we didn't actually
882 # choose a sane default compression above.
883 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
885 ifdef CONFIG_MODULE_SIG_ALL
886 $(eval $(call config_filename,MODULE_SIG_KEY))
888 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
895 ifeq ($(KBUILD_EXTMOD),)
896 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
898 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
899 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
900 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
902 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
903 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
905 init-y := $(patsubst %/, %/built-in.o, $(init-y))
906 core-y := $(patsubst %/, %/built-in.o, $(core-y))
907 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
908 net-y := $(patsubst %/, %/built-in.o, $(net-y))
909 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
910 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
911 libs-y := $(libs-y1) $(libs-y2)
912 virt-y := $(patsubst %/, %/built-in.o, $(virt-y))
914 # Externally visible symbols (used by link-vmlinux.sh)
915 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
916 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
917 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
918 export LDFLAGS_vmlinux
919 # used by scripts/pacmage/Makefile
920 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
922 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
924 # Final link of vmlinux
925 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
926 quiet_cmd_link-vmlinux = LINK $@
928 # Include targets which we want to
929 # execute if the rest of the kernel build went well.
930 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
931 ifdef CONFIG_HEADERS_CHECK
932 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
935 $(Q)$(MAKE) $(build)=samples
937 ifdef CONFIG_BUILD_DOCSRC
938 $(Q)$(MAKE) $(build)=Documentation
940 ifdef CONFIG_GDB_SCRIPTS
941 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
943 +$(call if_changed,link-vmlinux)
945 # The actual objects are generated when descending,
946 # make sure no implicit rule kicks in
947 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
949 # Handle descending into subdirectories listed in $(vmlinux-dirs)
950 # Preset locale variables to speed up the build process. Limit locale
951 # tweaks to this spot to avoid wrong language settings when running
952 # make menuconfig etc.
953 # Error messages still appears in the original language
955 PHONY += $(vmlinux-dirs)
956 $(vmlinux-dirs): prepare scripts
957 $(Q)$(MAKE) $(build)=$@
959 define filechk_kernel.release
960 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
963 # Store (new) KERNELRELEASE string in include/config/kernel.release
964 include/config/kernel.release: include/config/auto.conf FORCE
965 $(call filechk,kernel.release)
968 # Things we need to do before we recursively start building the kernel
969 # or the modules are listed in "prepare".
970 # A multi level approach is used. prepareN is processed before prepareN-1.
971 # archprepare is used in arch Makefiles and when processed asm symlink,
972 # version.h and scripts_basic is processed / created.
974 # Listed in dependency order
975 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
977 # prepare3 is used to check if we are building in a separate output directory,
979 # 1) Check that make has not been executed in the kernel src $(srctree)
980 prepare3: include/config/kernel.release
981 ifneq ($(KBUILD_SRC),)
982 @$(kecho) ' Using $(srctree) as source for kernel'
983 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
984 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
985 echo >&2 " in the '$(srctree)' directory.";\
990 # prepare2 creates a makefile if using a separate output directory
991 prepare2: prepare3 outputmakefile asm-generic
993 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
994 include/config/auto.conf
997 archprepare: archheaders archscripts prepare1 scripts_basic
999 prepare0: archprepare FORCE
1000 $(Q)$(MAKE) $(build)=.
1002 # All the preparing..
1005 # Generate some files
1006 # ---------------------------------------------------------------------------
1008 # KERNELRELEASE can change from a few different places, meaning version.h
1009 # needs to be updated, so this check is forced on all builds
1012 define filechk_utsrelease.h
1013 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1014 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1017 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1020 define filechk_version.h
1021 (echo \#define LINUX_VERSION_CODE $(shell \
1022 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1023 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1026 $(version_h): $(srctree)/Makefile FORCE
1027 $(call filechk,version.h)
1028 $(Q)rm -f $(old_version_h)
1030 include/generated/utsrelease.h: include/config/kernel.release FORCE
1031 $(call filechk,utsrelease.h)
1035 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1036 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1038 # ---------------------------------------------------------------------------
1040 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1041 export INSTALL_FW_PATH
1043 PHONY += firmware_install
1044 firmware_install: FORCE
1045 @mkdir -p $(objtree)/firmware
1046 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1048 # ---------------------------------------------------------------------------
1051 #Default location for installed headers
1052 export INSTALL_HDR_PATH = $(objtree)/usr
1054 # If we do an all arch process set dst to asm-$(hdr-arch)
1055 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1057 PHONY += archheaders
1060 PHONY += archscripts
1064 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1065 $(Q)$(MAKE) $(build)=scripts build_unifdef
1067 PHONY += headers_install_all
1068 headers_install_all:
1069 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1071 PHONY += headers_install
1072 headers_install: __headers
1073 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1074 $(error Headers not exportable for the $(SRCARCH) architecture))
1075 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1076 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1078 PHONY += headers_check_all
1079 headers_check_all: headers_install_all
1080 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1082 PHONY += headers_check
1083 headers_check: headers_install
1084 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1085 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1087 # ---------------------------------------------------------------------------
1092 $(Q)$(MAKE) -C tools/testing/selftests run_tests
1095 $(Q)$(MAKE) -C tools/testing/selftests clean
1097 # ---------------------------------------------------------------------------
1100 ifdef CONFIG_MODULES
1102 # By default, build modules as well
1108 # A module can be listed more than once in obj-m resulting in
1109 # duplicate lines in modules.order files. Those are removed
1110 # using awk while concatenating to the final file.
1113 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1114 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1115 @$(kecho) ' Building modules, stage 2.';
1116 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1117 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1119 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1120 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1122 %/modules.builtin: include/config/auto.conf
1123 $(Q)$(MAKE) $(modbuiltin)=$*
1126 # Target to prepare building external modules
1127 PHONY += modules_prepare
1128 modules_prepare: prepare scripts
1130 # Target to install modules
1131 PHONY += modules_install
1132 modules_install: _modinst_ _modinst_post
1136 @rm -rf $(MODLIB)/kernel
1137 @rm -f $(MODLIB)/source
1138 @mkdir -p $(MODLIB)/kernel
1139 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1140 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1141 rm -f $(MODLIB)/build ; \
1142 ln -s $(CURDIR) $(MODLIB)/build ; \
1144 @cp -f $(objtree)/modules.order $(MODLIB)/
1145 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1146 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1148 # This depmod is only for convenience to give the initial
1149 # boot a modules.dep even before / is mounted read-write. However the
1150 # boot script depmod is the master version.
1151 PHONY += _modinst_post
1152 _modinst_post: _modinst_
1153 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1156 ifeq ($(CONFIG_MODULE_SIG), y)
1157 PHONY += modules_sign
1159 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1162 else # CONFIG_MODULES
1164 # Modules not configured
1165 # ---------------------------------------------------------------------------
1167 modules modules_install: FORCE
1169 @echo >&2 "The present kernel configuration has modules disabled."
1170 @echo >&2 "Type 'make config' and enable loadable module support."
1171 @echo >&2 "Then build a kernel with module support enabled."
1175 endif # CONFIG_MODULES
1178 # Cleaning is done on three levels.
1179 # make clean Delete most generated files
1180 # Leave enough to build external modules
1181 # make mrproper Delete the current configuration, and all generated files
1182 # make distclean Remove editor backup files, patch leftover files and the like
1184 # Directories & files removed with 'make clean'
1185 CLEAN_DIRS += $(MODVERDIR)
1187 # Directories & files removed with 'make mrproper'
1188 MRPROPER_DIRS += include/config usr/include include/generated \
1189 arch/*/include/generated .tmp_objdiff
1190 MRPROPER_FILES += .config .config.old .version .old_version \
1191 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1192 signing_key.pem signing_key.priv signing_key.x509 \
1193 x509.genkey extra_certificates signing_key.x509.keyid \
1194 signing_key.x509.signer vmlinux-gdb.py
1196 # clean - Delete most, but leave enough to build external modules
1198 clean: rm-dirs := $(CLEAN_DIRS)
1199 clean: rm-files := $(CLEAN_FILES)
1200 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1202 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1204 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1207 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1209 clean: archclean vmlinuxclean
1211 # mrproper - Delete all generated files, including .config
1213 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1214 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1215 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1217 PHONY += $(mrproper-dirs) mrproper archmrproper
1219 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1221 mrproper: clean archmrproper $(mrproper-dirs)
1230 @find $(srctree) $(RCS_FIND_IGNORE) \
1231 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1232 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1233 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
1234 -type f -print | xargs rm -f
1237 # Packaging of the kernel to various formats
1238 # ---------------------------------------------------------------------------
1239 # rpm target kept for backward compatibility
1240 package-dir := scripts/package
1243 $(Q)$(MAKE) $(build)=$(package-dir) $@
1244 %pkg: include/config/kernel.release FORCE
1245 $(Q)$(MAKE) $(build)=$(package-dir) $@
1246 rpm: include/config/kernel.release FORCE
1247 $(Q)$(MAKE) $(build)=$(package-dir) $@
1250 # Brief documentation of the typical targets used
1251 # ---------------------------------------------------------------------------
1253 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1254 boards := $(sort $(notdir $(boards)))
1255 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1256 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1259 @echo 'Cleaning targets:'
1260 @echo ' clean - Remove most generated files but keep the config and'
1261 @echo ' enough build support to build external modules'
1262 @echo ' mrproper - Remove all generated files + config + various backup files'
1263 @echo ' distclean - mrproper + remove editor backup and patch files'
1265 @echo 'Configuration targets:'
1266 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1268 @echo 'Other generic targets:'
1269 @echo ' all - Build all targets marked with [*]'
1270 @echo '* vmlinux - Build the bare kernel'
1271 @echo '* modules - Build all modules'
1272 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1273 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1274 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1275 @echo ' dir/ - Build all files in dir and below'
1276 @echo ' dir/file.[oisS] - Build specified target only'
1277 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1278 @echo ' (requires a recent binutils and recent build (System.map))'
1279 @echo ' dir/file.ko - Build module including final link'
1280 @echo ' modules_prepare - Set up for building external modules'
1281 @echo ' tags/TAGS - Generate tags file for editors'
1282 @echo ' cscope - Generate cscope index'
1283 @echo ' gtags - Generate GNU GLOBAL index'
1284 @echo ' kernelrelease - Output the release version string (use with make -s)'
1285 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1286 @echo ' image_name - Output the image name (use with make -s)'
1287 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1288 echo ' (default: $(INSTALL_HDR_PATH))'; \
1290 @echo 'Static analysers'
1291 @echo ' checkstack - Generate a list of stack hogs'
1292 @echo ' namespacecheck - Name space analysis on compiled kernel'
1293 @echo ' versioncheck - Sanity check on version.h usage'
1294 @echo ' includecheck - Check for duplicate included header files'
1295 @echo ' export_report - List the usages of all exported symbols'
1296 @echo ' headers_check - Sanity check on exported headers'
1297 @echo ' headerdep - Detect inclusion cycles in headers'
1298 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1300 @echo 'Kernel selftest'
1301 @echo ' kselftest - Build and run kernel selftest (run as root)'
1302 @echo ' Build, install, and boot kernel before'
1303 @echo ' running kselftest on it'
1304 @echo ' kselftest-clean - Remove all generated kselftest files'
1306 @echo 'Kernel packaging:'
1307 @$(MAKE) $(build)=$(package-dir) help
1309 @echo 'Documentation targets:'
1310 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1312 @echo 'Architecture specific targets ($(SRCARCH)):'
1313 @$(if $(archhelp),$(archhelp),\
1314 echo ' No architecture specific help defined for $(SRCARCH)')
1317 $(foreach b, $(boards), \
1318 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1320 @$(if $(board-dirs), \
1321 $(foreach b, $(board-dirs), \
1322 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1323 printf " %-16s - Show all of the above\\n" help-boards; \
1326 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1327 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1328 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1329 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1330 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1331 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1332 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1333 @echo ' 1: warnings which may be relevant and do not occur too often'
1334 @echo ' 2: warnings which occur quite often but may still be relevant'
1335 @echo ' 3: more obscure warnings, can most likely be ignored'
1336 @echo ' Multiple levels can be combined with W=12 or W=123'
1338 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1339 @echo 'For further info see the ./README file'
1342 help-board-dirs := $(addprefix help-,$(board-dirs))
1344 help-boards: $(help-board-dirs)
1346 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1348 $(help-board-dirs): help-%:
1349 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1350 @$(if $(boards-per-dir), \
1351 $(foreach b, $(boards-per-dir), \
1352 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1356 # Documentation targets
1357 # ---------------------------------------------------------------------------
1358 %docs: scripts_basic FORCE
1359 $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1360 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1362 else # KBUILD_EXTMOD
1365 # External module support.
1366 # When building external modules the kernel used as basis is considered
1367 # read-only, and no consistency checks are made and the make
1368 # system is not used on the basis kernel. If updates are required
1369 # in the basis kernel ordinary make commands (without M=...) must
1372 # The following are the only valid targets when building external
1374 # make M=dir clean Delete all automatically generated files
1375 # make M=dir modules Make all modules in specified dir
1376 # make M=dir Same as 'make M=dir modules'
1377 # make M=dir modules_install
1378 # Install the modules built in the module directory
1379 # Assumes install directory is already created
1381 # We are always building modules
1383 PHONY += crmodverdir
1387 PHONY += $(objtree)/Module.symvers
1388 $(objtree)/Module.symvers:
1389 @test -e $(objtree)/Module.symvers || ( \
1391 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1392 echo " is missing; modules will have no dependencies and modversions."; \
1395 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1396 PHONY += $(module-dirs) modules
1397 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1398 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1400 modules: $(module-dirs)
1401 @$(kecho) ' Building modules, stage 2.';
1402 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1404 PHONY += modules_install
1405 modules_install: _emodinst_ _emodinst_post
1407 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1410 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1411 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1413 PHONY += _emodinst_post
1414 _emodinst_post: _emodinst_
1417 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1419 PHONY += $(clean-dirs) clean
1421 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1423 clean: rm-dirs := $(MODVERDIR)
1424 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1427 @echo ' Building external modules.'
1428 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1430 @echo ' modules - default target, build the module(s)'
1431 @echo ' modules_install - install the module'
1432 @echo ' clean - remove generated files in module directory only'
1436 PHONY += prepare scripts
1439 endif # KBUILD_EXTMOD
1441 clean: $(clean-dirs)
1444 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1445 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1449 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1450 -o -name '*.symtypes' -o -name 'modules.order' \
1451 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1452 -o -name '*.gcno' \) -type f -print | xargs rm -f
1454 # Generate tags for editors
1455 # ---------------------------------------------------------------------------
1456 quiet_cmd_tags = GEN $@
1457 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1459 tags TAGS cscope gtags: FORCE
1462 # Scripts to check various things for consistency
1463 # ---------------------------------------------------------------------------
1465 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1468 find $(srctree)/* $(RCS_FIND_IGNORE) \
1469 -name '*.[hcS]' -type f -print | sort \
1470 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1473 find $(srctree)/* $(RCS_FIND_IGNORE) \
1474 -name '*.[hcS]' -type f -print | sort \
1475 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1478 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1481 $(PERL) $(srctree)/scripts/namespace.pl
1484 $(PERL) $(srctree)/scripts/export_report.pl
1486 endif #ifeq ($(config-targets),1)
1487 endif #ifeq ($(mixed-targets),1)
1489 PHONY += checkstack kernelrelease kernelversion image_name
1491 # UML needs a little special treatment here. It wants to use the host
1492 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1493 # else wants $(ARCH), including people doing cross-builds, which means
1494 # that $(SUBARCH) doesn't work here.
1496 CHECKSTACK_ARCH := $(SUBARCH)
1498 CHECKSTACK_ARCH := $(ARCH)
1501 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1502 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1505 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1508 @echo $(KERNELVERSION)
1511 @echo $(KBUILD_IMAGE)
1513 # Clear a bunch of variables before executing the submake
1515 $(Q)mkdir -p $(objtree)/tools
1516 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(O) subdir=tools -C $(src)/tools/
1519 $(Q)mkdir -p $(objtree)/tools
1520 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(O) subdir=tools -C $(src)/tools/ $*
1523 # ---------------------------------------------------------------------------
1524 # Single targets are compatible with:
1525 # - build with mixed source and output
1526 # - build with separate output dir 'make O=...'
1527 # - external modules
1529 # target-dir => where to store outputfile
1530 # build-dir => directory in kernel source tree to use
1532 ifeq ($(KBUILD_EXTMOD),)
1533 build-dir = $(patsubst %/,%,$(dir $@))
1534 target-dir = $(dir $@)
1536 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1537 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1538 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1541 %.s: %.c prepare scripts FORCE
1542 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1543 %.i: %.c prepare scripts FORCE
1544 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1545 %.o: %.c prepare scripts FORCE
1546 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1547 %.lst: %.c prepare scripts FORCE
1548 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1549 %.s: %.S prepare scripts FORCE
1550 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1551 %.o: %.S prepare scripts FORCE
1552 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1553 %.symtypes: %.c prepare scripts FORCE
1554 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1557 /: prepare scripts FORCE
1559 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1560 $(build)=$(build-dir)
1561 # Make sure the latest headers are built for Documentation
1562 Documentation/: headers_install
1563 %/: prepare scripts FORCE
1565 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1566 $(build)=$(build-dir)
1567 %.ko: prepare scripts FORCE
1569 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1570 $(build)=$(build-dir) $(@:.ko=.o)
1571 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1573 # FIXME Should go into a make.lib or something
1574 # ===========================================================================
1576 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1577 cmd_rmdirs = rm -rf $(rm-dirs)
1579 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1580 cmd_rmfiles = rm -f $(rm-files)
1582 # Run depmod only if we have System.map and depmod is executable
1583 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1584 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1585 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1587 # Create temporary dir for module support files
1588 # clean it up only when building all modules
1589 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1590 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1592 # read all saved command lines
1594 targets := $(wildcard $(sort $(targets)))
1595 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1597 ifneq ($(cmd_files),)
1598 $(cmd_files): ; # Do not try to update included dependency files
1599 include $(cmd_files)
1602 endif # skip-makefile
1607 # Declare the contents of the .PHONY variable as phony. We keep that
1608 # information in a variable so we can use it in if_changed and friends.