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.
13 # o Do not use make's built-in rules and variables
14 # (this increases performance and avoids hard-to-debug behaviour);
15 # o Look for make include files relative to root of kernel src
16 MAKEFLAGS += -rR --include-dir=$(CURDIR)
18 # Avoid funny character set dependencies
22 export LC_COLLATE LC_NUMERIC
24 # Avoid interference with shell env settings
27 # We are using a recursive build, so we need to do a little thinking
28 # to get the ordering right.
30 # Most importantly: sub-Makefiles should only ever modify files in
31 # their own directory. If in some directory we have a dependency on
32 # a file in another dir (which doesn't happen often, but it's often
33 # unavoidable when linking the built-in.a targets which finally
34 # turn into vmlinux), we will call a sub make in that other dir, and
35 # after that we are sure that everything which is in that other dir
38 # The only cases where we need to modify files which have global
39 # effects are thus separated out and done before the recursive
40 # descending is started. They are now explicitly listed as the
44 # ---------------------------------------------------------------------------
46 # Normally, we echo the whole command before executing it. By making
47 # that echo $($(quiet)$(cmd)), we now have the possibility to set
48 # $(quiet) to choose other forms of output instead, e.g.
50 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
51 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
53 # If $(quiet) is empty, the whole command will be printed.
54 # If it is set to "quiet_", only the short version will be printed.
55 # If it is set to "silent_", nothing will be printed at all, since
56 # the variable $(silent_cmd_cc_o_c) doesn't exist.
58 # A simple variant is to prefix commands with $(Q) - that's useful
59 # for commands that shall be hidden in non-verbose mode.
63 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
64 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
66 # To put more focus on warnings, be less verbose as default
67 # Use 'make V=1' to see the full commands
69 ifeq ("$(origin V)", "command line")
76 ifeq ($(KBUILD_VERBOSE),1)
84 # If the user is running make -s (silent mode), suppress echoing of
87 ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
88 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
93 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 $(CURDIR)/Makefile Makefile: ;
133 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
134 $(error main directory cannot contain spaces nor colons)
137 ifneq ($(KBUILD_OUTPUT),)
138 # Invoke a second make in the output directory, passing relevant variables
139 # check that the output directory actually exists
140 saved-output := $(KBUILD_OUTPUT)
141 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
143 $(if $(KBUILD_OUTPUT),, \
144 $(error failed to create output directory "$(saved-output)"))
146 PHONY += $(MAKECMDGOALS) sub-make
148 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
152 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
153 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
155 # Leave processing to above invocation of make
157 endif # ifneq ($(KBUILD_OUTPUT),)
158 endif # ifeq ($(KBUILD_SRC),)
160 # We process the rest of the Makefile if this is the final invocation of make
161 ifeq ($(skip-makefile),)
163 # Do not print "Entering directory ...",
164 # but we want to display it when entering to the output directory
165 # so that IDEs/editors are able to understand relative filenames.
166 MAKEFLAGS += --no-print-directory
168 # Call a source code checker (by default, "sparse") as part of the
171 # Use 'make C=1' to enable checking of only re-compiled files.
172 # Use 'make C=2' to enable checking of *all* source files, regardless
173 # of whether they are re-compiled or not.
175 # See the file "Documentation/sparse.txt" for more details, including
176 # where to get the "sparse" utility.
178 ifeq ("$(origin C)", "command line")
179 KBUILD_CHECKSRC = $(C)
181 ifndef KBUILD_CHECKSRC
185 # Use make M=dir to specify directory of external module to build
186 # Old syntax make ... SUBDIRS=$PWD is still supported
187 # Setting the environment variable KBUILD_EXTMOD take precedence
189 KBUILD_EXTMOD ?= $(SUBDIRS)
192 ifeq ("$(origin M)", "command line")
193 KBUILD_EXTMOD := $(M)
196 # If building an external module we do not care about the all: rule
197 # but instead _all depend on modules
199 ifeq ($(KBUILD_EXTMOD),)
205 ifeq ($(KBUILD_SRC),)
206 # building in the source tree
209 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
210 # building in a subdirectory of the source tree
213 srctree := $(KBUILD_SRC)
220 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
222 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 -std=gnu89 -pipe
309 # Decide whether to build built-in, modular, or both.
310 # Normally, just do built-in.
315 # If we have only "make modules", don't compile built-in objects.
316 # When we're building modules with modversions, we need to consider
317 # the built-in objects during the descend as well, in order to
318 # make sure the checksums are up to date before we record them.
320 ifeq ($(MAKECMDGOALS),modules)
321 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
324 # If we have "make <whatever> modules", compile modules
325 # in addition to whatever we do anyway.
326 # Just "make" or "make all" shall build modules as well
328 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
332 ifeq ($(MAKECMDGOALS),)
336 export KBUILD_MODULES KBUILD_BUILTIN
337 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
339 # We need some generic definitions (do not try to remake the file).
340 scripts/Kbuild.include: ;
341 include scripts/Kbuild.include
343 # Make variables (CC, etc...)
344 AS = $(CROSS_COMPILE)as
345 LD = $(CROSS_COMPILE)ld
347 CC = $(CROSS_COMPILE)gcc
349 AR = $(CROSS_COMPILE)ar
350 NM = $(CROSS_COMPILE)nm
351 STRIP = $(CROSS_COMPILE)strip
352 OBJCOPY = $(CROSS_COMPILE)objcopy
353 OBJDUMP = $(CROSS_COMPILE)objdump
355 GENKSYMS = scripts/genksyms/genksyms
356 INSTALLKERNEL := installkernel
357 DEPMOD = /sbin/depmod
362 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
363 -Wbitwise -Wno-return-void $(CF)
369 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage -fno-tree-loop-im
370 CFLAGS_KCOV = -fsanitize-coverage=trace-pc
373 # Use USERINCLUDE when you must reference the UAPI directories only.
375 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
376 -Iarch/$(hdr-arch)/include/generated/uapi \
377 -I$(srctree)/include/uapi \
378 -Iinclude/generated/uapi \
379 -include $(srctree)/include/linux/kconfig.h
381 # Use LINUXINCLUDE when you must reference the include/ directory.
382 # Needed to be compatible with the O= option
384 -I$(srctree)/arch/$(hdr-arch)/include \
385 -Iarch/$(hdr-arch)/include/generated/uapi \
386 -Iarch/$(hdr-arch)/include/generated \
387 $(if $(KBUILD_SRC), -I$(srctree)/include) \
391 KBUILD_CPPFLAGS := -D__KERNEL__
393 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -pipe \
394 -fno-strict-aliasing -fno-common \
395 -Werror-implicit-function-declaration \
396 -Wno-format-security \
397 -std=gnu89 $(call cc-option,-fno-PIE)
399 ifeq ($(TARGET_BOARD_TYPE),auto)
400 KBUILD_CFLAGS += -DCONFIG_PLATFORM_AUTO
402 KBUILD_AFLAGS_KERNEL :=
403 KBUILD_CFLAGS_KERNEL :=
404 KBUILD_AFLAGS := -D__ASSEMBLY__ $(call cc-option,-fno-PIE)
405 KBUILD_AFLAGS_MODULE := -DMODULE
406 KBUILD_CFLAGS_MODULE := -DMODULE
407 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
409 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
410 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
411 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
413 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
414 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
415 export CPP AR NM STRIP OBJCOPY OBJDUMP
416 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
417 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
419 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
420 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
421 export CFLAGS_KASAN CFLAGS_UBSAN CFLAGS_KASAN_NOSANITIZE
423 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
424 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
425 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
426 export KBUILD_ARFLAGS
428 # When compiling out-of-tree modules, put MODVERDIR in the module
429 # tree rather than in the kernel tree. The kernel tree might
431 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
433 # Files to ignore in find ... statements
435 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
436 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
438 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
439 --exclude CVS --exclude .pc --exclude .hg --exclude .git
441 # ===========================================================================
442 # Rules shared between *config targets and build targets
444 # Basic helpers built in scripts/
445 PHONY += scripts_basic
447 $(Q)$(MAKE) $(build)=scripts/basic
448 $(Q)rm -f .tmp_quiet_recordmcount
450 # To avoid any implicit rule to kick in, define an empty command.
451 scripts/basic/%: scripts_basic ;
453 PHONY += outputmakefile
454 # outputmakefile generates a Makefile in the output directory, if using a
455 # separate output directory. This allows convenient use of make in the
458 ifneq ($(KBUILD_SRC),)
459 $(Q)ln -fsn $(srctree) source
460 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
461 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
464 # Support for using generic headers in asm-generic
467 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
468 src=asm obj=arch/$(SRCARCH)/include/generated/asm
469 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
470 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
472 # To make sure we do not include .config for any of the *config targets
473 # catch them early, and hand them over to scripts/kconfig/Makefile
474 # It is allowed to specify more targets when calling make, including
475 # mixing *config targets and build targets.
476 # For example 'make oldconfig all'.
477 # Detect when mixed targets is specified, and make a second invocation
478 # of make so .config is not included in this case either (for *config).
480 version_h := include/generated/uapi/linux/version.h
481 old_version_h := include/linux/version.h
483 no-dot-config-targets := clean mrproper distclean \
484 cscope gtags TAGS tags help% %docs check% coccicheck \
485 $(version_h) headers_% archheaders archscripts \
486 kernelversion %src-pkg
492 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
493 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
498 ifeq ($(KBUILD_EXTMOD),)
499 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
501 ifneq ($(words $(MAKECMDGOALS)),1)
506 # install and module_install need also be processed one by one
507 ifneq ($(filter install,$(MAKECMDGOALS)),)
508 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
513 ifeq ($(mixed-targets),1)
514 # ===========================================================================
515 # We're called with mixed targets (*config and build targets).
516 # Handle them one by one.
518 PHONY += $(MAKECMDGOALS) __build_one_by_one
520 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
525 for i in $(MAKECMDGOALS); do \
526 $(MAKE) -f $(srctree)/Makefile $$i; \
530 ifeq ($(config-targets),1)
531 # ===========================================================================
532 # *config targets only - make sure prerequisites are updated, and descend
533 # in scripts/kconfig to make the *config target
535 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
536 # KBUILD_DEFCONFIG may point out an alternative default configuration
537 # used for 'make defconfig'
538 include 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 ifeq ($(cc-name),clang)
616 ifneq ($(CROSS_COMPILE),)
617 CLANG_TRIPLE ?= $(CROSS_COMPILE)
618 CLANG_TARGET := --target=$(notdir $(CLANG_TRIPLE:%-=%))
619 ifeq ($(shell $(srctree)/scripts/clang-android.sh $(CC) $(CLANG_TARGET)), y)
620 $(error "Clang with Android --target detected. Did you specify CLANG_TRIPLE?")
622 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
623 CLANG_PREFIX := --prefix=$(GCC_TOOLCHAIN_DIR)
624 GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
626 ifneq ($(GCC_TOOLCHAIN),)
627 CLANG_GCC_TC := --gcc-toolchain=$(GCC_TOOLCHAIN)
629 KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) $(CLANG_PREFIX)
630 KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) $(CLANG_PREFIX)
631 KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
632 KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
635 # Make toolchain changes before including arch/$(SRCARCH)/Makefile to ensure
636 # ar/cc/ld-* macros return correct values.
637 ifdef CONFIG_LTO_CLANG
638 # use LLVM linker LLD for LTO linking and vmlinux_link
640 # use llvm-ar for building symbol tables from IR files, and llvm-nm instead
641 # of objdump for processing symbol versions and exports
644 export LLVM_AR LLVM_NM
647 ifeq ($(cc-name),clang)
648 ifeq ($(ld-name),lld)
649 KBUILD_CFLAGS += -fuse-ld=lld
652 KBUILD_CPPFLAGS += -Qunused-arguments
655 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
656 # values of the respective KBUILD_* variables
660 include arch/$(SRCARCH)/Makefile
662 ifeq ($(cc-name),clang)
664 KBUILD_CFLAGS += $(call cc-option, -mllvm -polly) \
665 $(call cc-option, -mllvm -polly-run-dce) \
666 $(call cc-option, -mllvm -polly-run-inliner) \
667 $(call cc-option, -mllvm -polly-opt-fusion=max) \
668 $(call cc-option, -mllvm -polly-ast-use-context) \
669 $(call cc-option, -mllvm -polly-detect-keep-going) \
670 $(call cc-option, -mllvm -polly-vectorizer=stripmine) \
671 $(call cc-option, -mllvm -polly-invariant-load-hoisting)
676 ifeq ($(cc-name),gcc)
677 KBUILD_CFLAGS += -mcpu=cortex-a73.cortex-a53
678 KBUILD_AFLAGS += -mcpu=cortex-a73.cortex-a53
680 ifeq ($(cc-name),clang)
681 KBUILD_CFLAGS += -mcpu=cortex-a53
682 KBUILD_AFLAGS += -mcpu=cortex-a53
685 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
686 KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,)
687 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
688 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
689 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
690 KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context)
691 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
692 KBUILD_CFLAGS += $(call cc-disable-warning, attribute-alias)
694 ifdef CONFIG_CC_WERROR
695 KBUILD_CFLAGS += -Werror
698 # Tell gcc to never replace conditional load with a non-conditional one
699 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
701 # check for 'asm goto'
702 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
703 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
704 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
707 ifdef CONFIG_READABLE_ASM
708 # Disable optimizations that make assembler listings hard to read.
709 # reorder blocks reorders the control in the function
710 # ipa clone creates specialized cloned functions
711 # partial inlining inlines only parts of functions
712 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
713 $(call cc-option,-fno-ipa-cp-clone,) \
714 $(call cc-option,-fno-partial-inlining)
717 ifneq ($(CONFIG_FRAME_WARN),0)
718 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
721 # Handle stack protector mode.
723 # Since kbuild can potentially perform two passes (first with the old
724 # .config values and then with updated .config values), we cannot error out
725 # if a desired compiler option is unsupported. If we were to error, kbuild
726 # could never get to the second pass and actually notice that we changed
727 # the option to something that was supported.
729 # Additionally, we don't want to fallback and/or silently change which compiler
730 # flags will be used, since that leads to producing kernels with different
731 # security feature characteristics depending on the compiler used. ("But I
732 # selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
734 # The middle ground is to warn here so that the failed option is obvious, but
735 # to let the build fail with bad compiler flags so that we can't produce a
736 # kernel when there is a CONFIG and compiler mismatch.
738 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
739 stackp-flag := -fstack-protector
740 ifeq ($(call cc-option, $(stackp-flag)),)
741 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
742 -fstack-protector not supported by compiler)
745 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
746 stackp-flag := -fstack-protector-strong
747 ifeq ($(call cc-option, $(stackp-flag)),)
748 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
749 -fstack-protector-strong not supported by compiler)
752 # Force off for distro compilers that enable stack protector by default.
753 stackp-flag := $(call cc-option, -fno-stack-protector)
756 KBUILD_CFLAGS += $(stackp-flag)
759 ifeq ($(call cc-option, $(CFLAGS_KCOV)),)
760 $(warning Cannot use CONFIG_KCOV: \
761 -fsanitize-coverage=trace-pc is not supported by compiler)
766 ifeq ($(cc-name),clang)
767 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
768 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
769 KBUILD_CFLAGS += $(call cc-disable-warning, duplicate-decl-specifier)
770 # Quiet clang warning: comparison of unsigned expression < 0 is always false
771 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
772 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
773 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
774 # See modpost pattern 2
775 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
778 # These warnings generated too much noise in a regular build.
779 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
780 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
783 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
784 ifdef CONFIG_FRAME_POINTER
785 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
787 # Some targets (ARM with Thumb2, for example), can't be built with frame
788 # pointers. For those, we don't have FUNCTION_TRACER automatically
789 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
790 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
791 # -fomit-frame-pointer with FUNCTION_TRACER.
792 ifndef CONFIG_FUNCTION_TRACER
793 KBUILD_CFLAGS += -fomit-frame-pointer
797 # Initialize all stack variables with a pattern, if desired.
798 ifdef CONFIG_INIT_STACK_ALL
799 KBUILD_CFLAGS += $(call cc-option, -ftrivial-auto-var-init=pattern)
802 KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
804 ifdef CONFIG_DEBUG_INFO
805 ifdef CONFIG_DEBUG_INFO_SPLIT
806 KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
810 KBUILD_AFLAGS += -Wa,-gdwarf-2
812 ifdef CONFIG_DEBUG_INFO_DWARF4
813 KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
816 ifdef CONFIG_DEBUG_INFO_REDUCED
817 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
818 $(call cc-option,-fno-var-tracking)
821 ifdef CONFIG_FUNCTION_TRACER
822 ifndef CC_FLAGS_FTRACE
823 CC_FLAGS_FTRACE := -pg
825 export CC_FLAGS_FTRACE
826 ifdef CONFIG_HAVE_FENTRY
827 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
829 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
830 KBUILD_AFLAGS += $(CC_USING_FENTRY)
831 ifdef CONFIG_DYNAMIC_FTRACE
832 ifdef CONFIG_HAVE_C_RECORDMCOUNT
833 BUILD_C_RECORDMCOUNT := y
834 export BUILD_C_RECORDMCOUNT
839 # We trigger additional mismatches with less inlining
840 ifdef CONFIG_DEBUG_SECTION_MISMATCH
841 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
844 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
845 KBUILD_CFLAGS_KERNEL += $(call cc-option,-ffunction-sections,)
846 KBUILD_CFLAGS_KERNEL += $(call cc-option,-fdata-sections,)
849 ifdef CONFIG_LTO_CLANG
851 lto-clang-flags := -flto=thin
852 LDFLAGS += --thinlto-cache-dir=.thinlto-cache
854 lto-clang-flags := -flto
856 lto-clang-flags += -fvisibility=hidden
858 # allow disabling only clang LTO where needed
859 DISABLE_LTO_CLANG := -fno-lto -fvisibility=default
860 export DISABLE_LTO_CLANG
864 LTO_CFLAGS := $(lto-clang-flags)
865 KBUILD_CFLAGS += $(LTO_CFLAGS)
867 DISABLE_LTO := $(DISABLE_LTO_CLANG)
868 export LTO_CFLAGS DISABLE_LTO
871 # arch Makefile may override CC so keep this after arch Makefile is included
872 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
873 CHECKFLAGS += $(NOSTDINC_FLAGS)
875 # warn about C99 declaration after statement
876 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
878 # disable pointer signed / unsigned warnings in gcc 4.0
879 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
881 # disable stringop warnings in gcc 8+
882 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
884 # disable invalid "can't wrap" optimizations for signed / pointers
885 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
887 # clang sets -fmerge-all-constants by default as optimization, but this
888 # is non-conforming behavior for C and in fact breaks the kernel, so we
889 # need to disable it here generally.
890 KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants)
892 # for gcc -fno-merge-all-constants disables everything, but it is fine
893 # to have actual conforming behavior enabled.
894 KBUILD_CFLAGS += $(call cc-option,-fmerge-constants)
896 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
897 KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,)
899 # conserve stack if available
900 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
902 # disallow errors like 'EXPORT_GPL(foo);' with missing header
903 KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
905 # require functions to have arguments in prototypes, not empty 'int foo()'
906 KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
908 # Prohibit date/time macros, which would make the build non-deterministic
909 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
911 # ensure -fcf-protection is disabled when using retpoline as it is
912 # incompatible with -mindirect-branch=thunk-extern
913 ifdef CONFIG_RETPOLINE
914 KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
917 # use the deterministic mode of AR if available
918 KBUILD_ARFLAGS := $(call ar-option,D)
920 include scripts/Makefile.kasan
921 include scripts/Makefile.extrawarn
922 include scripts/Makefile.ubsan
924 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
926 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
927 KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
928 KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
930 # Use --build-id when available.
931 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
932 $(call cc-ldoption, -Wl$(comma)--build-id,))
933 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
934 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
936 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
937 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
940 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
941 LDFLAGS_vmlinux += $(call ld-option, -X,)
944 # Default kernel image to build when no specific target is given.
945 # KBUILD_IMAGE may be overruled on the command line or
946 # set in the environment
947 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
949 export KBUILD_IMAGE ?= vmlinux
952 # INSTALL_PATH specifies where to place the updated kernel and system map
953 # images. Default is /boot, but you can set it to other values
954 export INSTALL_PATH ?= /boot
957 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
958 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
959 # an argument if needed. Otherwise it defaults to the kernel install path
961 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
964 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
965 # relocations required by build roots. This is not defined in the
966 # makefile but the argument can be passed to make if needed.
969 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
973 # INSTALL_MOD_STRIP, if defined, will cause modules to be
974 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
975 # the default option --strip-debug will be used. Otherwise,
976 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
978 ifdef INSTALL_MOD_STRIP
979 ifeq ($(INSTALL_MOD_STRIP),1)
980 mod_strip_cmd = $(STRIP) --strip-debug
982 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
983 endif # INSTALL_MOD_STRIP=1
986 endif # INSTALL_MOD_STRIP
989 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
990 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
991 # or CONFIG_MODULE_COMPRESS_XZ.
993 mod_compress_cmd = true
994 ifdef CONFIG_MODULE_COMPRESS
995 ifdef CONFIG_MODULE_COMPRESS_GZIP
996 mod_compress_cmd = gzip -n -f
997 endif # CONFIG_MODULE_COMPRESS_GZIP
998 ifdef CONFIG_MODULE_COMPRESS_XZ
999 mod_compress_cmd = xz -f
1000 endif # CONFIG_MODULE_COMPRESS_XZ
1001 endif # CONFIG_MODULE_COMPRESS
1002 export mod_compress_cmd
1004 # Select initial ramdisk compression format, default is gzip(1).
1005 # This shall be used by the dracut(8) tool while creating an initramfs image.
1007 INITRD_COMPRESS-y := gzip
1008 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
1009 INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
1010 INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
1011 INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
1012 INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
1013 # do not export INITRD_COMPRESS, since we didn't actually
1014 # choose a sane default compression above.
1015 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
1017 ifdef CONFIG_MODULE_SIG_ALL
1018 $(eval $(call config_filename,MODULE_SIG_KEY))
1020 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
1027 ifeq ($(KBUILD_EXTMOD),)
1028 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1030 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
1031 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1032 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1034 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
1035 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
1037 init-y := $(patsubst %/, %/built-in.a, $(init-y))
1038 core-y := $(patsubst %/, %/built-in.a, $(core-y))
1039 drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y))
1040 net-y := $(patsubst %/, %/built-in.a, $(net-y))
1041 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
1042 libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
1043 virt-y := $(patsubst %/, %/built-in.a, $(virt-y))
1045 # Externally visible symbols (used by link-vmlinux.sh)
1046 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
1047 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
1048 export KBUILD_VMLINUX_LIBS := $(libs-y1)
1049 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1050 export LDFLAGS_vmlinux
1051 # used by scripts/pacmage/Makefile
1052 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
1054 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
1056 # Final link of vmlinux
1057 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
1058 quiet_cmd_link-vmlinux = LINK $@
1060 # Include targets which we want to
1061 # execute if the rest of the kernel build went well.
1062 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
1063 ifdef CONFIG_HEADERS_CHECK
1064 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
1066 ifdef CONFIG_SAMPLES
1067 $(Q)$(MAKE) $(build)=samples
1069 ifdef CONFIG_BUILD_DOCSRC
1070 $(Q)$(MAKE) $(build)=Documentation
1072 ifdef CONFIG_GDB_SCRIPTS
1073 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
1075 +$(call if_changed,link-vmlinux)
1077 # The actual objects are generated when descending,
1078 # make sure no implicit rule kicks in
1079 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1081 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1082 # Preset locale variables to speed up the build process. Limit locale
1083 # tweaks to this spot to avoid wrong language settings when running
1084 # make menuconfig etc.
1085 # Error messages still appears in the original language
1087 PHONY += $(vmlinux-dirs)
1088 $(vmlinux-dirs): prepare scripts
1089 $(Q)$(MAKE) $(build)=$@ need-builtin=1
1091 define filechk_kernel.release
1092 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1095 # Store (new) KERNELRELEASE string in include/config/kernel.release
1096 include/config/kernel.release: include/config/auto.conf FORCE
1097 $(call filechk,kernel.release)
1100 # Things we need to do before we recursively start building the kernel
1101 # or the modules are listed in "prepare".
1102 # A multi level approach is used. prepareN is processed before prepareN-1.
1103 # archprepare is used in arch Makefiles and when processed asm symlink,
1104 # version.h and scripts_basic is processed / created.
1106 # Listed in dependency order
1107 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1109 # prepare3 is used to check if we are building in a separate output directory,
1111 # 1) Check that make has not been executed in the kernel src $(srctree)
1112 prepare3: include/config/kernel.release
1113 ifneq ($(KBUILD_SRC),)
1114 @$(kecho) ' Using $(srctree) as source for kernel'
1115 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1116 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1117 echo >&2 " in the '$(srctree)' directory.";\
1122 # prepare2 creates a makefile if using a separate output directory
1123 prepare2: prepare3 outputmakefile asm-generic
1125 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1126 include/config/auto.conf
1129 archprepare: archheaders archscripts prepare1 scripts_basic
1131 prepare0: archprepare
1132 $(Q)$(MAKE) $(build)=.
1134 # All the preparing..
1137 # Make sure we're using a supported toolchain with LTO_CLANG
1138 ifdef CONFIG_LTO_CLANG
1139 ifneq ($(call clang-ifversion, -ge, 0800, y), y)
1140 @echo Cannot use CONFIG_LTO_CLANG: requires clang 8.0 or later >&2 && exit 1
1142 ifneq ($(ld-name),lld)
1143 @echo Cannot use CONFIG_LTO_CLANG: requires LLD >&2 && exit 1
1146 # Make sure compiler supports LTO flags
1148 ifeq ($(call cc-option, $(lto-flags)),)
1149 @echo Cannot use CONFIG_LTO: $(lto-flags) not supported by compiler \
1154 # Generate some files
1155 # ---------------------------------------------------------------------------
1157 # KERNELRELEASE can change from a few different places, meaning version.h
1158 # needs to be updated, so this check is forced on all builds
1161 define filechk_utsrelease.h
1162 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1163 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1166 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1169 define filechk_version.h
1170 (echo \#define LINUX_VERSION_CODE $(shell \
1171 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1172 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1175 $(version_h): $(srctree)/Makefile FORCE
1176 $(call filechk,version.h)
1177 $(Q)rm -f $(old_version_h)
1179 include/generated/utsrelease.h: include/config/kernel.release FORCE
1180 $(call filechk,utsrelease.h)
1184 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1185 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1187 # ---------------------------------------------------------------------------
1189 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1190 export INSTALL_FW_PATH
1192 PHONY += firmware_install
1194 @mkdir -p $(objtree)/firmware
1195 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1197 # ---------------------------------------------------------------------------
1200 #Default location for installed headers
1201 export INSTALL_HDR_PATH = $(objtree)/usr
1203 # If we do an all arch process set dst to asm-$(hdr-arch)
1204 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1206 PHONY += archheaders
1209 PHONY += archscripts
1213 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts
1214 $(Q)$(MAKE) $(build)=scripts build_unifdef
1216 PHONY += headers_install_all
1217 headers_install_all:
1218 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1220 PHONY += headers_install
1221 headers_install: __headers
1222 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1223 $(error Headers not exportable for the $(SRCARCH) architecture))
1224 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1225 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1227 PHONY += headers_check_all
1228 headers_check_all: headers_install_all
1229 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1231 PHONY += headers_check
1232 headers_check: headers_install
1233 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1234 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1236 # ---------------------------------------------------------------------------
1241 $(Q)$(MAKE) -C tools/testing/selftests run_tests
1244 $(Q)$(MAKE) -C tools/testing/selftests clean
1246 # ---------------------------------------------------------------------------
1249 ifdef CONFIG_MODULES
1251 # By default, build modules as well
1257 # A module can be listed more than once in obj-m resulting in
1258 # duplicate lines in modules.order files. Those are removed
1259 # using awk while concatenating to the final file.
1262 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1263 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1264 @$(kecho) ' Building modules, stage 2.';
1265 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1266 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1268 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1269 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1271 %/modules.builtin: include/config/auto.conf
1272 $(Q)$(MAKE) $(modbuiltin)=$*
1275 # Target to prepare building external modules
1276 PHONY += modules_prepare
1277 modules_prepare: prepare scripts
1279 # Target to install modules
1280 PHONY += modules_install
1281 modules_install: _modinst_ _modinst_post
1285 @rm -rf $(MODLIB)/kernel
1286 @rm -f $(MODLIB)/source
1287 @mkdir -p $(MODLIB)/kernel
1288 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1289 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1290 rm -f $(MODLIB)/build ; \
1291 ln -s $(CURDIR) $(MODLIB)/build ; \
1293 @cp -f $(objtree)/modules.order $(MODLIB)/
1294 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1295 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1297 # This depmod is only for convenience to give the initial
1298 # boot a modules.dep even before / is mounted read-write. However the
1299 # boot script depmod is the master version.
1300 PHONY += _modinst_post
1301 _modinst_post: _modinst_
1302 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1305 ifeq ($(CONFIG_MODULE_SIG), y)
1306 PHONY += modules_sign
1308 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1311 else # CONFIG_MODULES
1313 # Modules not configured
1314 # ---------------------------------------------------------------------------
1316 modules modules_install: FORCE
1318 @echo >&2 "The present kernel configuration has modules disabled."
1319 @echo >&2 "Type 'make config' and enable loadable module support."
1320 @echo >&2 "Then build a kernel with module support enabled."
1324 endif # CONFIG_MODULES
1327 # Cleaning is done on three levels.
1328 # make clean Delete most generated files
1329 # Leave enough to build external modules
1330 # make mrproper Delete the current configuration, and all generated files
1331 # make distclean Remove editor backup files, patch leftover files and the like
1333 # Directories & files removed with 'make clean'
1334 CLEAN_DIRS += $(MODVERDIR)
1336 # Directories & files removed with 'make mrproper'
1337 MRPROPER_DIRS += include/config usr/include include/generated \
1338 arch/*/include/generated .tmp_objdiff
1339 MRPROPER_FILES += .config .config.old .version .old_version \
1340 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1341 signing_key.pem signing_key.priv signing_key.x509 \
1342 x509.genkey extra_certificates signing_key.x509.keyid \
1343 signing_key.x509.signer vmlinux-gdb.py
1345 # clean - Delete most, but leave enough to build external modules
1347 clean: rm-dirs := $(CLEAN_DIRS)
1348 clean: rm-files := $(CLEAN_FILES)
1349 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1351 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1353 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1356 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1358 clean: archclean vmlinuxclean
1360 # mrproper - Delete all generated files, including .config
1362 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1363 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1364 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1366 PHONY += $(mrproper-dirs) mrproper archmrproper
1368 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1370 mrproper: clean archmrproper $(mrproper-dirs)
1379 @find $(srctree) $(RCS_FIND_IGNORE) \
1380 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1381 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1382 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
1383 -type f -print | xargs rm -f
1386 # Packaging of the kernel to various formats
1387 # ---------------------------------------------------------------------------
1388 # rpm target kept for backward compatibility
1389 package-dir := scripts/package
1392 $(Q)$(MAKE) $(build)=$(package-dir) $@
1393 %pkg: include/config/kernel.release FORCE
1394 $(Q)$(MAKE) $(build)=$(package-dir) $@
1395 rpm: include/config/kernel.release FORCE
1396 $(Q)$(MAKE) $(build)=$(package-dir) $@
1399 # Brief documentation of the typical targets used
1400 # ---------------------------------------------------------------------------
1402 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1403 boards := $(sort $(notdir $(boards)))
1404 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1405 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1408 @echo 'Cleaning targets:'
1409 @echo ' clean - Remove most generated files but keep the config and'
1410 @echo ' enough build support to build external modules'
1411 @echo ' mrproper - Remove all generated files + config + various backup files'
1412 @echo ' distclean - mrproper + remove editor backup and patch files'
1414 @echo 'Configuration targets:'
1415 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1417 @echo 'Other generic targets:'
1418 @echo ' all - Build all targets marked with [*]'
1419 @echo '* vmlinux - Build the bare kernel'
1420 @echo '* modules - Build all modules'
1421 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1422 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1423 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1424 @echo ' dir/ - Build all files in dir and below'
1425 @echo ' dir/file.[ois] - Build specified target only'
1426 @echo ' dir/file.ll - Build the LLVM assembly file'
1427 @echo ' (requires compiler support for LLVM assembly generation)'
1428 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1429 @echo ' (requires a recent binutils and recent build (System.map))'
1430 @echo ' dir/file.ko - Build module including final link'
1431 @echo ' modules_prepare - Set up for building external modules'
1432 @echo ' tags/TAGS - Generate tags file for editors'
1433 @echo ' cscope - Generate cscope index'
1434 @echo ' gtags - Generate GNU GLOBAL index'
1435 @echo ' kernelrelease - Output the release version string (use with make -s)'
1436 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1437 @echo ' image_name - Output the image name (use with make -s)'
1438 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1439 echo ' (default: $(INSTALL_HDR_PATH))'; \
1441 @echo 'Static analysers'
1442 @echo ' checkstack - Generate a list of stack hogs'
1443 @echo ' namespacecheck - Name space analysis on compiled kernel'
1444 @echo ' versioncheck - Sanity check on version.h usage'
1445 @echo ' includecheck - Check for duplicate included header files'
1446 @echo ' export_report - List the usages of all exported symbols'
1447 @echo ' headers_check - Sanity check on exported headers'
1448 @echo ' headerdep - Detect inclusion cycles in headers'
1449 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1451 @echo 'Kernel selftest'
1452 @echo ' kselftest - Build and run kernel selftest (run as root)'
1453 @echo ' Build, install, and boot kernel before'
1454 @echo ' running kselftest on it'
1455 @echo ' kselftest-clean - Remove all generated kselftest files'
1457 @echo 'Kernel packaging:'
1458 @$(MAKE) $(build)=$(package-dir) help
1460 @echo 'Documentation targets:'
1461 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1463 @echo 'Architecture specific targets ($(SRCARCH)):'
1464 @$(if $(archhelp),$(archhelp),\
1465 echo ' No architecture specific help defined for $(SRCARCH)')
1468 $(foreach b, $(boards), \
1469 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1471 @$(if $(board-dirs), \
1472 $(foreach b, $(board-dirs), \
1473 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1474 printf " %-16s - Show all of the above\\n" help-boards; \
1477 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1478 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1479 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1480 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1481 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1482 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1483 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1484 @echo ' 1: warnings which may be relevant and do not occur too often'
1485 @echo ' 2: warnings which occur quite often but may still be relevant'
1486 @echo ' 3: more obscure warnings, can most likely be ignored'
1487 @echo ' Multiple levels can be combined with W=12 or W=123'
1489 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1490 @echo 'For further info see the ./README file'
1493 help-board-dirs := $(addprefix help-,$(board-dirs))
1495 help-boards: $(help-board-dirs)
1497 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1499 $(help-board-dirs): help-%:
1500 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1501 @$(if $(boards-per-dir), \
1502 $(foreach b, $(boards-per-dir), \
1503 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1507 # Documentation targets
1508 # ---------------------------------------------------------------------------
1509 %docs: scripts_basic FORCE
1510 $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1511 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1513 else # KBUILD_EXTMOD
1516 # External module support.
1517 # When building external modules the kernel used as basis is considered
1518 # read-only, and no consistency checks are made and the make
1519 # system is not used on the basis kernel. If updates are required
1520 # in the basis kernel ordinary make commands (without M=...) must
1523 # The following are the only valid targets when building external
1525 # make M=dir clean Delete all automatically generated files
1526 # make M=dir modules Make all modules in specified dir
1527 # make M=dir Same as 'make M=dir modules'
1528 # make M=dir modules_install
1529 # Install the modules built in the module directory
1530 # Assumes install directory is already created
1532 # We are always building modules
1535 PHONY += $(objtree)/Module.symvers
1536 $(objtree)/Module.symvers:
1537 @test -e $(objtree)/Module.symvers || ( \
1539 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1540 echo " is missing; modules will have no dependencies and modversions."; \
1543 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1544 PHONY += $(module-dirs) modules
1545 $(module-dirs): prepare $(objtree)/Module.symvers
1546 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1548 modules: $(module-dirs)
1549 @$(kecho) ' Building modules, stage 2.';
1550 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1552 PHONY += modules_install
1553 modules_install: _emodinst_ _emodinst_post
1555 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1558 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1559 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1561 PHONY += _emodinst_post
1562 _emodinst_post: _emodinst_
1565 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1567 PHONY += $(clean-dirs) clean
1569 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1571 clean: rm-dirs := $(MODVERDIR)
1572 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1575 @echo ' Building external modules.'
1576 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1578 @echo ' modules - default target, build the module(s)'
1579 @echo ' modules_install - install the module'
1580 @echo ' clean - remove generated files in module directory only'
1584 PHONY += prepare scripts
1588 endif # KBUILD_EXTMOD
1590 clean: $(clean-dirs)
1593 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1594 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1598 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1599 -o -name '*.symtypes' -o -name 'modules.order' \
1600 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1603 -o -name '*.*.symversions' \) -type f -print | xargs rm -f
1605 # Generate tags for editors
1606 # ---------------------------------------------------------------------------
1607 quiet_cmd_tags = GEN $@
1608 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1610 tags TAGS cscope gtags: FORCE
1613 # Scripts to check various things for consistency
1614 # ---------------------------------------------------------------------------
1616 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1619 find $(srctree)/* $(RCS_FIND_IGNORE) \
1620 -name '*.[hcS]' -type f -print | sort \
1621 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1624 find $(srctree)/* $(RCS_FIND_IGNORE) \
1625 -name '*.[hcS]' -type f -print | sort \
1626 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1629 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1632 $(PERL) $(srctree)/scripts/namespace.pl
1635 $(PERL) $(srctree)/scripts/export_report.pl
1637 endif #ifeq ($(config-targets),1)
1638 endif #ifeq ($(mixed-targets),1)
1640 PHONY += checkstack kernelrelease kernelversion image_name
1642 # UML needs a little special treatment here. It wants to use the host
1643 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1644 # else wants $(ARCH), including people doing cross-builds, which means
1645 # that $(SUBARCH) doesn't work here.
1647 CHECKSTACK_ARCH := $(SUBARCH)
1649 CHECKSTACK_ARCH := $(ARCH)
1652 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1653 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1656 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1659 @echo $(KERNELVERSION)
1662 @echo $(KBUILD_IMAGE)
1664 # Clear a bunch of variables before executing the submake
1666 $(Q)mkdir -p $(objtree)/tools
1667 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1670 $(Q)mkdir -p $(objtree)/tools
1671 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1674 # ---------------------------------------------------------------------------
1675 # Single targets are compatible with:
1676 # - build with mixed source and output
1677 # - build with separate output dir 'make O=...'
1678 # - external modules
1680 # target-dir => where to store outputfile
1681 # build-dir => directory in kernel source tree to use
1683 ifeq ($(KBUILD_EXTMOD),)
1684 build-dir = $(patsubst %/,%,$(dir $@))
1685 target-dir = $(dir $@)
1687 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1688 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1689 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1692 %.s: %.c prepare scripts FORCE
1693 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1694 %.i: %.c prepare scripts FORCE
1695 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1696 %.o: %.c prepare scripts FORCE
1697 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1698 %.lst: %.c prepare scripts FORCE
1699 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1700 %.s: %.S prepare scripts FORCE
1701 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1702 %.o: %.S prepare scripts FORCE
1703 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1704 %.symtypes: %.c prepare scripts FORCE
1705 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1706 %.ll: %.c prepare scripts FORCE
1707 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1710 /: prepare scripts FORCE
1711 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1712 $(build)=$(build-dir)
1713 # Make sure the latest headers are built for Documentation
1714 Documentation/: headers_install
1715 %/: prepare scripts FORCE
1716 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1717 $(build)=$(build-dir)
1718 %.ko: prepare scripts FORCE
1719 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1720 $(build)=$(build-dir) $(@:.ko=.o)
1721 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1723 # FIXME Should go into a make.lib or something
1724 # ===========================================================================
1726 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1727 cmd_rmdirs = rm -rf $(rm-dirs)
1729 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1730 cmd_rmfiles = rm -f $(rm-files)
1732 # Run depmod only if we have System.map and depmod is executable
1733 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1734 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1735 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1737 # Create temporary dir for module support files
1738 # clean it up only when building all modules
1739 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1740 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1742 # read all saved command lines
1744 targets := $(wildcard $(sort $(targets)))
1745 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1747 ifneq ($(cmd_files),)
1748 $(cmd_files): ; # Do not try to update included dependency files
1749 include $(cmd_files)
1752 endif # skip-makefile
1757 # Declare the contents of the .PHONY variable as phony. We keep that
1758 # information in a variable so we can use it in if_changed and friends.