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.o 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))),)
92 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
97 export quiet Q KBUILD_VERBOSE
99 # kbuild supports saving output files in a separate directory.
100 # To locate output files in a separate directory two syntaxes are supported.
101 # In both cases the working directory must be the root of the kernel src.
103 # Use "make O=dir/to/store/output/files/"
105 # 2) Set KBUILD_OUTPUT
106 # Set the environment variable KBUILD_OUTPUT to point to the directory
107 # where the output files shall be placed.
108 # export KBUILD_OUTPUT=dir/to/store/output/files/
111 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
114 # KBUILD_SRC is set on invocation of make in OBJ directory
115 # KBUILD_SRC is not intended to be used by the regular user (for now)
116 ifeq ($(KBUILD_SRC),)
118 # OK, Make called in directory where kernel src resides
119 # Do we want to locate output files in a separate directory?
120 ifeq ("$(origin O)", "command line")
121 KBUILD_OUTPUT := $(O)
124 # That's our default target when none is given on the command line
128 # Cancel implicit rules on top Makefile
129 $(CURDIR)/Makefile Makefile: ;
131 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
132 $(error main directory cannot contain spaces nor colons)
135 ifneq ($(KBUILD_OUTPUT),)
136 # Invoke a second make in the output directory, passing relevant variables
137 # check that the output directory actually exists
138 saved-output := $(KBUILD_OUTPUT)
139 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
141 $(if $(KBUILD_OUTPUT),, \
142 $(error failed to create output directory "$(saved-output)"))
144 PHONY += $(MAKECMDGOALS) sub-make
146 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
150 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
151 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
153 # Leave processing to above invocation of make
155 endif # ifneq ($(KBUILD_OUTPUT),)
156 endif # ifeq ($(KBUILD_SRC),)
158 # We process the rest of the Makefile if this is the final invocation of make
159 ifeq ($(skip-makefile),)
161 # Do not print "Entering directory ...",
162 # but we want to display it when entering to the output directory
163 # so that IDEs/editors are able to understand relative filenames.
164 MAKEFLAGS += --no-print-directory
166 # Call a source code checker (by default, "sparse") as part of the
169 # Use 'make C=1' to enable checking of only re-compiled files.
170 # Use 'make C=2' to enable checking of *all* source files, regardless
171 # of whether they are re-compiled or not.
173 # See the file "Documentation/sparse.txt" for more details, including
174 # where to get the "sparse" utility.
176 ifeq ("$(origin C)", "command line")
177 KBUILD_CHECKSRC = $(C)
179 ifndef KBUILD_CHECKSRC
183 # Use make M=dir to specify directory of external module to build
184 # Old syntax make ... SUBDIRS=$PWD is still supported
185 # Setting the environment variable KBUILD_EXTMOD take precedence
187 KBUILD_EXTMOD ?= $(SUBDIRS)
190 ifeq ("$(origin M)", "command line")
191 KBUILD_EXTMOD := $(M)
194 # If building an external module we do not care about the all: rule
195 # but instead _all depend on modules
197 ifeq ($(KBUILD_EXTMOD),)
203 ifeq ($(KBUILD_SRC),)
204 # building in the source tree
207 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
208 # building in a subdirectory of the source tree
211 srctree := $(KBUILD_SRC)
218 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
220 export srctree objtree VPATH
222 # SUBARCH tells the usermode build what the underlying arch is. That is set
223 # first, and if a usermode build is happening, the "ARCH=um" on the command
224 # line overrides the setting of ARCH below. If a native build is happening,
225 # then ARCH is assigned, getting whatever value it gets normally, and
226 # SUBARCH is subsequently ignored.
228 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
229 -e s/sun4u/sparc64/ \
230 -e s/arm.*/arm/ -e s/sa110/arm/ \
231 -e s/s390x/s390/ -e s/parisc64/parisc/ \
232 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
233 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
235 # Cross compiling and selecting different set of gcc/bin-utils
236 # ---------------------------------------------------------------------------
238 # When performing cross compilation for other architectures ARCH shall be set
239 # to the target architecture. (See arch/* for the possibilities).
240 # ARCH can be set during invocation of make:
242 # Another way is to have ARCH set in the environment.
243 # The default ARCH is the host where make is executed.
245 # CROSS_COMPILE specify the prefix used for all executables used
246 # during compilation. Only gcc and related bin-utils executables
247 # are prefixed with $(CROSS_COMPILE).
248 # CROSS_COMPILE can be set on the command line
249 # make CROSS_COMPILE=ia64-linux-
250 # Alternatively CROSS_COMPILE can be set in the environment.
251 # A third alternative is to store a setting in .config so that plain
252 # "make" in the configured kernel build directory always uses that.
253 # Default value for CROSS_COMPILE is not to prefix executables
254 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
256 CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
258 # Architecture as present in compile.h
259 UTS_MACHINE := $(ARCH)
262 # Additional ARCH settings for x86
266 ifeq ($(ARCH),x86_64)
270 # Additional ARCH settings for sparc
271 ifeq ($(ARCH),sparc32)
274 ifeq ($(ARCH),sparc64)
278 # Additional ARCH settings for sh
283 # Additional ARCH settings for tile
284 ifeq ($(ARCH),tilepro)
287 ifeq ($(ARCH),tilegx)
291 # Where to locate arch specific headers
292 hdr-arch := $(SRCARCH)
294 KCONFIG_CONFIG ?= .config
295 export KCONFIG_CONFIG
297 # SHELL used by kbuild
298 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
299 else if [ -x /bin/bash ]; then echo /bin/bash; \
300 else echo sh; fi ; fi)
304 HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
307 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
308 HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
309 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
312 # Decide whether to build built-in, modular, or both.
313 # Normally, just do built-in.
318 # If we have only "make modules", don't compile built-in objects.
319 # When we're building modules with modversions, we need to consider
320 # the built-in objects during the descend as well, in order to
321 # make sure the checksums are up to date before we record them.
323 ifeq ($(MAKECMDGOALS),modules)
324 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
327 # If we have "make <whatever> modules", compile modules
328 # in addition to whatever we do anyway.
329 # Just "make" or "make all" shall build modules as well
331 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
335 ifeq ($(MAKECMDGOALS),)
339 export KBUILD_MODULES KBUILD_BUILTIN
340 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
342 # We need some generic definitions (do not try to remake the file).
343 scripts/Kbuild.include: ;
344 include scripts/Kbuild.include
346 # Make variables (CC, etc...)
347 AS = $(CROSS_COMPILE)as
348 LD = $(CROSS_COMPILE)ld
349 REAL_CC = $(CROSS_COMPILE)gcc
351 AR = $(CROSS_COMPILE)ar
352 NM = $(CROSS_COMPILE)nm
353 STRIP = $(CROSS_COMPILE)strip
354 OBJCOPY = $(CROSS_COMPILE)objcopy
355 OBJDUMP = $(CROSS_COMPILE)objdump
357 GENKSYMS = scripts/genksyms/genksyms
358 INSTALLKERNEL := installkernel
359 DEPMOD = /sbin/depmod
364 # Use the wrapper for the compiler. This wrapper scans for new
365 # warnings and causes the build to stop upon encountering them.
366 CC = $(srctree)/scripts/gcc-wrapper.py $(REAL_CC)
368 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
369 -Wbitwise -Wno-return-void $(CF)
375 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage -fno-tree-loop-im
376 CFLAGS_KCOV = -fsanitize-coverage=trace-pc
379 # Use USERINCLUDE when you must reference the UAPI directories only.
381 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
382 -Iarch/$(hdr-arch)/include/generated/uapi \
383 -I$(srctree)/include/uapi \
384 -Iinclude/generated/uapi \
385 -include $(srctree)/include/linux/kconfig.h
387 # Use LINUXINCLUDE when you must reference the include/ directory.
388 # Needed to be compatible with the O= option
390 -I$(srctree)/arch/$(hdr-arch)/include \
391 -Iarch/$(hdr-arch)/include/generated/uapi \
392 -Iarch/$(hdr-arch)/include/generated \
393 $(if $(KBUILD_SRC), -I$(srctree)/include) \
397 KBUILD_CPPFLAGS := -D__KERNEL__
399 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
400 -fno-strict-aliasing -fno-common \
401 -Werror-implicit-function-declaration \
402 -Wno-format-security \
403 -std=gnu89 $(call cc-option,-fno-PIE)
406 KBUILD_AFLAGS_KERNEL :=
407 KBUILD_CFLAGS_KERNEL :=
408 KBUILD_AFLAGS := -D__ASSEMBLY__ $(call cc-option,-fno-PIE)
409 KBUILD_AFLAGS_MODULE := -DMODULE
410 KBUILD_CFLAGS_MODULE := -DMODULE
411 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
413 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
414 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
415 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
417 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
418 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
419 export CPP AR NM STRIP OBJCOPY OBJDUMP
420 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
421 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
423 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
424 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
425 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
426 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
427 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
428 export KBUILD_ARFLAGS
430 # When compiling out-of-tree modules, put MODVERDIR in the module
431 # tree rather than in the kernel tree. The kernel tree might
433 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
435 # Files to ignore in find ... statements
437 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
438 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
440 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
441 --exclude CVS --exclude .pc --exclude .hg --exclude .git
443 # ===========================================================================
444 # Rules shared between *config targets and build targets
446 # Basic helpers built in scripts/
447 PHONY += scripts_basic
449 $(Q)$(MAKE) $(build)=scripts/basic
450 $(Q)rm -f .tmp_quiet_recordmcount
452 # To avoid any implicit rule to kick in, define an empty command.
453 scripts/basic/%: scripts_basic ;
455 PHONY += outputmakefile
456 # outputmakefile generates a Makefile in the output directory, if using a
457 # separate output directory. This allows convenient use of make in the
460 ifneq ($(KBUILD_SRC),)
461 $(Q)ln -fsn $(srctree) source
462 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
463 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
466 # Support for using generic headers in asm-generic
469 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
470 src=asm obj=arch/$(SRCARCH)/include/generated/asm
471 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
472 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
474 # To make sure we do not include .config for any of the *config targets
475 # catch them early, and hand them over to scripts/kconfig/Makefile
476 # It is allowed to specify more targets when calling make, including
477 # mixing *config targets and build targets.
478 # For example 'make oldconfig all'.
479 # Detect when mixed targets is specified, and make a second invocation
480 # of make so .config is not included in this case either (for *config).
482 version_h := include/generated/uapi/linux/version.h
483 old_version_h := include/linux/version.h
485 no-dot-config-targets := clean mrproper distclean \
486 cscope gtags TAGS tags help% %docs check% coccicheck \
487 $(version_h) headers_% archheaders archscripts \
488 kernelversion %src-pkg
494 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
495 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
500 ifeq ($(KBUILD_EXTMOD),)
501 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
503 ifneq ($(words $(MAKECMDGOALS)),1)
508 # install and module_install need also be processed one by one
509 ifneq ($(filter install,$(MAKECMDGOALS)),)
510 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
515 ifeq ($(mixed-targets),1)
516 # ===========================================================================
517 # We're called with mixed targets (*config and build targets).
518 # Handle them one by one.
520 PHONY += $(MAKECMDGOALS) __build_one_by_one
522 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
527 for i in $(MAKECMDGOALS); do \
528 $(MAKE) -f $(srctree)/Makefile $$i; \
532 ifeq ($(config-targets),1)
533 # ===========================================================================
534 # *config targets only - make sure prerequisites are updated, and descend
535 # in scripts/kconfig to make the *config target
537 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
538 # KBUILD_DEFCONFIG may point out an alternative default configuration
539 # used for 'make defconfig'
540 include arch/$(SRCARCH)/Makefile
541 export KBUILD_DEFCONFIG KBUILD_KCONFIG
543 config: scripts_basic outputmakefile FORCE
544 $(Q)$(MAKE) $(build)=scripts/kconfig $@
546 %config: scripts_basic outputmakefile FORCE
547 $(Q)$(MAKE) $(build)=scripts/kconfig $@
550 # ===========================================================================
551 # Build targets only - this includes vmlinux, arch specific targets, clean
552 # targets and others. In general all targets except *config targets.
554 ifeq ($(KBUILD_EXTMOD),)
555 # Additional helpers built in scripts/
556 # Carefully list dependencies so we do not try to build scripts twice
559 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
561 $(Q)$(MAKE) $(build)=$(@)
563 # Objects we will link into vmlinux / subdirs we need to visit
565 drivers-y := drivers/ sound/ firmware/
570 endif # KBUILD_EXTMOD
572 ifeq ($(dot-config),1)
574 -include include/config/auto.conf
576 ifeq ($(KBUILD_EXTMOD),)
577 # Read in dependencies to all Kconfig* files, make sure to run
578 # oldconfig if changes are detected.
579 -include include/config/auto.conf.cmd
581 # To avoid any implicit rule to kick in, define an empty command
582 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
584 # If .config is newer than include/config/auto.conf, someone tinkered
585 # with it and forgot to run make oldconfig.
586 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
587 # we execute the config step to be sure to catch updated Kconfig files
588 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
589 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
591 # external modules needs include/generated/autoconf.h and include/config/auto.conf
592 # but do not care if they are up-to-date. Use auto.conf to trigger the test
593 PHONY += include/config/auto.conf
595 include/config/auto.conf:
596 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
598 echo >&2 " ERROR: Kernel configuration is invalid."; \
599 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
600 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
604 endif # KBUILD_EXTMOD
607 # Dummy target needed, because used as prerequisite
608 include/config/auto.conf: ;
609 endif # $(dot-config)
611 # The all: target is the default when no target is given on the
613 # This allow a user to issue only 'make' to build a kernel including modules
614 # Defaults to vmlinux, but the arch makefile usually adds further targets
617 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
618 # values of the respective KBUILD_* variables
622 include arch/$(SRCARCH)/Makefile
624 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
625 KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,)
626 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
627 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
628 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
629 KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context)
631 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
632 KBUILD_CFLAGS += $(call cc-option,-Oz,-Os)
634 ifdef CONFIG_PROFILE_ALL_BRANCHES
641 # Tell gcc to never replace conditional load with a non-conditional one
642 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
644 # check for 'asm goto'
645 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
646 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
647 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
650 ifdef CONFIG_READABLE_ASM
651 # Disable optimizations that make assembler listings hard to read.
652 # reorder blocks reorders the control in the function
653 # ipa clone creates specialized cloned functions
654 # partial inlining inlines only parts of functions
655 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
656 $(call cc-option,-fno-ipa-cp-clone,) \
657 $(call cc-option,-fno-partial-inlining)
660 ifneq ($(CONFIG_FRAME_WARN),0)
661 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
664 # Handle stack protector mode.
666 # Since kbuild can potentially perform two passes (first with the old
667 # .config values and then with updated .config values), we cannot error out
668 # if a desired compiler option is unsupported. If we were to error, kbuild
669 # could never get to the second pass and actually notice that we changed
670 # the option to something that was supported.
672 # Additionally, we don't want to fallback and/or silently change which compiler
673 # flags will be used, since that leads to producing kernels with different
674 # security feature characteristics depending on the compiler used. ("But I
675 # selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
677 # The middle ground is to warn here so that the failed option is obvious, but
678 # to let the build fail with bad compiler flags so that we can't produce a
679 # kernel when there is a CONFIG and compiler mismatch.
681 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
682 stackp-flag := -fstack-protector
683 ifeq ($(call cc-option, $(stackp-flag)),)
684 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
685 -fstack-protector not supported by compiler)
688 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
689 stackp-flag := -fstack-protector-strong
690 ifeq ($(call cc-option, $(stackp-flag)),)
691 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
692 -fstack-protector-strong not supported by compiler)
695 # Force off for distro compilers that enable stack protector by default.
696 stackp-flag := $(call cc-option, -fno-stack-protector)
699 KBUILD_CFLAGS += $(stackp-flag)
702 ifeq ($(call cc-option, $(CFLAGS_KCOV)),)
703 $(warning Cannot use CONFIG_KCOV: \
704 -fsanitize-coverage=trace-pc is not supported by compiler)
709 ifeq ($(cc-name),clang)
710 ifneq ($(CROSS_COMPILE),)
711 CLANG_TRIPLE ?= $(CROSS_COMPILE)
712 CLANG_TARGET := --target=$(notdir $(CLANG_TRIPLE:%-=%))
713 GCC_TOOLCHAIN := $(realpath $(dir $(shell which $(LD)))/..)
715 ifneq ($(GCC_TOOLCHAIN),)
716 CLANG_GCC_TC := --gcc-toolchain=$(GCC_TOOLCHAIN)
718 KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
719 KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
720 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
721 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
722 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
723 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
724 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
725 KBUILD_CFLAGS += $(call cc-disable-warning, duplicate-decl-specifier)
726 # Quiet clang warning: comparison of unsigned expression < 0 is always false
727 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
728 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
729 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
730 # See modpost pattern 2
731 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
732 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
733 KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
734 KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
737 # These warnings generated too much noise in a regular build.
738 # Use make W=1 to enable them (see scripts/Makefile.build)
739 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
740 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
743 ifdef CONFIG_FRAME_POINTER
744 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
746 # Some targets (ARM with Thumb2, for example), can't be built with frame
747 # pointers. For those, we don't have FUNCTION_TRACER automatically
748 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
749 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
750 # -fomit-frame-pointer with FUNCTION_TRACER.
751 ifndef CONFIG_FUNCTION_TRACER
752 KBUILD_CFLAGS += -fomit-frame-pointer
756 KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
758 ifdef CONFIG_DEBUG_INFO
759 ifdef CONFIG_DEBUG_INFO_SPLIT
760 KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
764 KBUILD_AFLAGS += -Wa,-gdwarf-2
766 ifdef CONFIG_DEBUG_INFO_DWARF4
767 KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
770 ifdef CONFIG_DEBUG_INFO_REDUCED
771 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
772 $(call cc-option,-fno-var-tracking)
775 ifdef CONFIG_FUNCTION_TRACER
776 ifndef CC_FLAGS_FTRACE
777 CC_FLAGS_FTRACE := -pg
779 export CC_FLAGS_FTRACE
780 ifdef CONFIG_HAVE_FENTRY
781 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
783 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
784 KBUILD_AFLAGS += $(CC_USING_FENTRY)
785 ifdef CONFIG_DYNAMIC_FTRACE
786 ifdef CONFIG_HAVE_C_RECORDMCOUNT
787 BUILD_C_RECORDMCOUNT := y
788 export BUILD_C_RECORDMCOUNT
793 # We trigger additional mismatches with less inlining
794 ifdef CONFIG_DEBUG_SECTION_MISMATCH
795 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
798 # arch Makefile may override CC so keep this after arch Makefile is included
799 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
800 CHECKFLAGS += $(NOSTDINC_FLAGS)
802 # warn about C99 declaration after statement
803 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
805 # disable pointer signed / unsigned warnings in gcc 4.0
806 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
808 # disable invalid "can't wrap" optimizations for signed / pointers
809 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
811 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
812 KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,)
814 # conserve stack if available
815 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
817 # disallow errors like 'EXPORT_GPL(foo);' with missing header
818 KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
820 # require functions to have arguments in prototypes, not empty 'int foo()'
821 KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
823 # Prohibit date/time macros, which would make the build non-deterministic
824 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
826 # use the deterministic mode of AR if available
827 KBUILD_ARFLAGS := $(call ar-option,D)
829 include scripts/Makefile.kasan
830 include scripts/Makefile.extrawarn
831 include scripts/Makefile.ubsan
833 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
835 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
836 KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
837 KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
839 # Use --build-id when available.
840 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
841 $(call cc-ldoption, -Wl$(comma)--build-id,))
842 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
843 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
845 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
846 LDFLAGS_vmlinux += $(call ld-option, -X,)
849 # Default kernel image to build when no specific target is given.
850 # KBUILD_IMAGE may be overruled on the command line or
851 # set in the environment
852 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
854 export KBUILD_IMAGE ?= vmlinux
857 # INSTALL_PATH specifies where to place the updated kernel and system map
858 # images. Default is /boot, but you can set it to other values
859 export INSTALL_PATH ?= /boot
862 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
863 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
864 # an argument if needed. Otherwise it defaults to the kernel install path
866 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
869 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
870 # relocations required by build roots. This is not defined in the
871 # makefile but the argument can be passed to make if needed.
874 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
878 # INSTALL_MOD_STRIP, if defined, will cause modules to be
879 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
880 # the default option --strip-debug will be used. Otherwise,
881 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
883 ifdef INSTALL_MOD_STRIP
884 ifeq ($(INSTALL_MOD_STRIP),1)
885 mod_strip_cmd = $(STRIP) --strip-debug
887 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
888 endif # INSTALL_MOD_STRIP=1
891 endif # INSTALL_MOD_STRIP
894 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
895 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
896 # or CONFIG_MODULE_COMPRESS_XZ.
898 mod_compress_cmd = true
899 ifdef CONFIG_MODULE_COMPRESS
900 ifdef CONFIG_MODULE_COMPRESS_GZIP
901 mod_compress_cmd = gzip -n -f
902 endif # CONFIG_MODULE_COMPRESS_GZIP
903 ifdef CONFIG_MODULE_COMPRESS_XZ
904 mod_compress_cmd = xz -f
905 endif # CONFIG_MODULE_COMPRESS_XZ
906 endif # CONFIG_MODULE_COMPRESS
907 export mod_compress_cmd
909 # Select initial ramdisk compression format, default is gzip(1).
910 # This shall be used by the dracut(8) tool while creating an initramfs image.
912 INITRD_COMPRESS-y := gzip
913 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
914 INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
915 INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
916 INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
917 INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
918 # do not export INITRD_COMPRESS, since we didn't actually
919 # choose a sane default compression above.
920 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
922 ifdef CONFIG_MODULE_SIG_ALL
923 $(eval $(call config_filename,MODULE_SIG_KEY))
925 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
932 ifeq ($(KBUILD_EXTMOD),)
933 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
935 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
936 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
937 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
939 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
940 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
942 init-y := $(patsubst %/, %/built-in.o, $(init-y))
943 core-y := $(patsubst %/, %/built-in.o, $(core-y))
944 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
945 net-y := $(patsubst %/, %/built-in.o, $(net-y))
946 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
947 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
948 libs-y := $(libs-y1) $(libs-y2)
949 virt-y := $(patsubst %/, %/built-in.o, $(virt-y))
951 # Externally visible symbols (used by link-vmlinux.sh)
952 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
953 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
954 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
955 export LDFLAGS_vmlinux
956 # used by scripts/pacmage/Makefile
957 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
959 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
961 # Final link of vmlinux
962 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
963 quiet_cmd_link-vmlinux = LINK $@
965 # Include targets which we want to
966 # execute if the rest of the kernel build went well.
967 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
968 ifdef CONFIG_HEADERS_CHECK
969 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
972 $(Q)$(MAKE) $(build)=samples
974 ifdef CONFIG_BUILD_DOCSRC
975 $(Q)$(MAKE) $(build)=Documentation
977 ifdef CONFIG_GDB_SCRIPTS
978 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
980 +$(call if_changed,link-vmlinux)
982 # The actual objects are generated when descending,
983 # make sure no implicit rule kicks in
984 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
986 # Handle descending into subdirectories listed in $(vmlinux-dirs)
987 # Preset locale variables to speed up the build process. Limit locale
988 # tweaks to this spot to avoid wrong language settings when running
989 # make menuconfig etc.
990 # Error messages still appears in the original language
992 PHONY += $(vmlinux-dirs)
993 $(vmlinux-dirs): prepare scripts
994 $(Q)$(MAKE) $(build)=$@
996 define filechk_kernel.release
997 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1000 # Store (new) KERNELRELEASE string in include/config/kernel.release
1001 include/config/kernel.release: include/config/auto.conf FORCE
1002 $(call filechk,kernel.release)
1005 # Things we need to do before we recursively start building the kernel
1006 # or the modules are listed in "prepare".
1007 # A multi level approach is used. prepareN is processed before prepareN-1.
1008 # archprepare is used in arch Makefiles and when processed asm symlink,
1009 # version.h and scripts_basic is processed / created.
1011 # Listed in dependency order
1012 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1014 # prepare3 is used to check if we are building in a separate output directory,
1016 # 1) Check that make has not been executed in the kernel src $(srctree)
1017 prepare3: include/config/kernel.release
1018 ifneq ($(KBUILD_SRC),)
1019 @$(kecho) ' Using $(srctree) as source for kernel'
1020 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1021 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1022 echo >&2 " in the '$(srctree)' directory.";\
1027 # prepare2 creates a makefile if using a separate output directory
1028 prepare2: prepare3 outputmakefile asm-generic
1030 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1031 include/config/auto.conf
1034 archprepare: archheaders archscripts prepare1 scripts_basic
1036 prepare0: archprepare
1037 $(Q)$(MAKE) $(build)=.
1039 # All the preparing..
1042 # Generate some files
1043 # ---------------------------------------------------------------------------
1045 # KERNELRELEASE can change from a few different places, meaning version.h
1046 # needs to be updated, so this check is forced on all builds
1049 define filechk_utsrelease.h
1050 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1051 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1054 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1057 define filechk_version.h
1058 (echo \#define LINUX_VERSION_CODE $(shell \
1059 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1060 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1063 $(version_h): $(srctree)/Makefile FORCE
1064 $(call filechk,version.h)
1065 $(Q)rm -f $(old_version_h)
1067 include/generated/utsrelease.h: include/config/kernel.release FORCE
1068 $(call filechk,utsrelease.h)
1072 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1073 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1075 # ---------------------------------------------------------------------------
1077 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1078 export INSTALL_FW_PATH
1080 PHONY += firmware_install
1082 @mkdir -p $(objtree)/firmware
1083 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1085 # ---------------------------------------------------------------------------
1088 #Default location for installed headers
1089 export INSTALL_HDR_PATH = $(objtree)/usr
1091 # If we do an all arch process set dst to asm-$(hdr-arch)
1092 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1094 PHONY += archheaders
1097 PHONY += archscripts
1101 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts
1102 $(Q)$(MAKE) $(build)=scripts build_unifdef
1104 PHONY += headers_install_all
1105 headers_install_all:
1106 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1108 PHONY += headers_install
1109 headers_install: __headers
1110 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1111 $(error Headers not exportable for the $(SRCARCH) architecture))
1112 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1113 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1115 PHONY += headers_check_all
1116 headers_check_all: headers_install_all
1117 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1119 PHONY += headers_check
1120 headers_check: headers_install
1121 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1122 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1124 # ---------------------------------------------------------------------------
1129 $(Q)$(MAKE) -C tools/testing/selftests run_tests
1132 $(Q)$(MAKE) -C tools/testing/selftests clean
1134 # ---------------------------------------------------------------------------
1137 ifdef CONFIG_MODULES
1139 # By default, build modules as well
1145 # A module can be listed more than once in obj-m resulting in
1146 # duplicate lines in modules.order files. Those are removed
1147 # using awk while concatenating to the final file.
1150 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1151 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1152 @$(kecho) ' Building modules, stage 2.';
1153 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1154 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1156 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1157 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1159 %/modules.builtin: include/config/auto.conf
1160 $(Q)$(MAKE) $(modbuiltin)=$*
1163 # Target to prepare building external modules
1164 PHONY += modules_prepare
1165 modules_prepare: prepare scripts
1167 # Target to install modules
1168 PHONY += modules_install
1169 modules_install: _modinst_ _modinst_post
1173 @rm -rf $(MODLIB)/kernel
1174 @rm -f $(MODLIB)/source
1175 @mkdir -p $(MODLIB)/kernel
1176 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1177 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1178 rm -f $(MODLIB)/build ; \
1179 ln -s $(CURDIR) $(MODLIB)/build ; \
1181 @cp -f $(objtree)/modules.order $(MODLIB)/
1182 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1183 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1185 # This depmod is only for convenience to give the initial
1186 # boot a modules.dep even before / is mounted read-write. However the
1187 # boot script depmod is the master version.
1188 PHONY += _modinst_post
1189 _modinst_post: _modinst_
1190 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1193 ifeq ($(CONFIG_MODULE_SIG), y)
1194 PHONY += modules_sign
1196 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1199 else # CONFIG_MODULES
1201 # Modules not configured
1202 # ---------------------------------------------------------------------------
1204 modules modules_install: FORCE
1206 @echo >&2 "The present kernel configuration has modules disabled."
1207 @echo >&2 "Type 'make config' and enable loadable module support."
1208 @echo >&2 "Then build a kernel with module support enabled."
1212 endif # CONFIG_MODULES
1215 # Cleaning is done on three levels.
1216 # make clean Delete most generated files
1217 # Leave enough to build external modules
1218 # make mrproper Delete the current configuration, and all generated files
1219 # make distclean Remove editor backup files, patch leftover files and the like
1221 # Directories & files removed with 'make clean'
1222 CLEAN_DIRS += $(MODVERDIR)
1224 # Directories & files removed with 'make mrproper'
1225 MRPROPER_DIRS += include/config usr/include include/generated \
1226 arch/*/include/generated .tmp_objdiff
1227 MRPROPER_FILES += .config .config.old .version .old_version \
1228 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1229 signing_key.pem signing_key.priv signing_key.x509 \
1230 x509.genkey extra_certificates signing_key.x509.keyid \
1231 signing_key.x509.signer vmlinux-gdb.py
1233 # clean - Delete most, but leave enough to build external modules
1235 clean: rm-dirs := $(CLEAN_DIRS)
1236 clean: rm-files := $(CLEAN_FILES)
1237 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1239 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1241 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1244 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1246 clean: archclean vmlinuxclean
1248 # mrproper - Delete all generated files, including .config
1250 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1251 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1252 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1254 PHONY += $(mrproper-dirs) mrproper archmrproper
1256 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1258 mrproper: clean archmrproper $(mrproper-dirs)
1267 @find $(srctree) $(RCS_FIND_IGNORE) \
1268 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1269 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1270 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
1271 -type f -print | xargs rm -f
1274 # Packaging of the kernel to various formats
1275 # ---------------------------------------------------------------------------
1276 # rpm target kept for backward compatibility
1277 package-dir := scripts/package
1280 $(Q)$(MAKE) $(build)=$(package-dir) $@
1281 %pkg: include/config/kernel.release FORCE
1282 $(Q)$(MAKE) $(build)=$(package-dir) $@
1283 rpm: include/config/kernel.release FORCE
1284 $(Q)$(MAKE) $(build)=$(package-dir) $@
1287 # Brief documentation of the typical targets used
1288 # ---------------------------------------------------------------------------
1290 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1291 boards := $(sort $(notdir $(boards)))
1292 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1293 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1296 @echo 'Cleaning targets:'
1297 @echo ' clean - Remove most generated files but keep the config and'
1298 @echo ' enough build support to build external modules'
1299 @echo ' mrproper - Remove all generated files + config + various backup files'
1300 @echo ' distclean - mrproper + remove editor backup and patch files'
1302 @echo 'Configuration targets:'
1303 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1305 @echo 'Other generic targets:'
1306 @echo ' all - Build all targets marked with [*]'
1307 @echo '* vmlinux - Build the bare kernel'
1308 @echo '* modules - Build all modules'
1309 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1310 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1311 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1312 @echo ' dir/ - Build all files in dir and below'
1313 @echo ' dir/file.[ois] - Build specified target only'
1314 @echo ' dir/file.ll - Build the LLVM assembly file'
1315 @echo ' (requires compiler support for LLVM assembly generation)'
1316 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1317 @echo ' (requires a recent binutils and recent build (System.map))'
1318 @echo ' dir/file.ko - Build module including final link'
1319 @echo ' modules_prepare - Set up for building external modules'
1320 @echo ' tags/TAGS - Generate tags file for editors'
1321 @echo ' cscope - Generate cscope index'
1322 @echo ' gtags - Generate GNU GLOBAL index'
1323 @echo ' kernelrelease - Output the release version string (use with make -s)'
1324 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1325 @echo ' image_name - Output the image name (use with make -s)'
1326 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1327 echo ' (default: $(INSTALL_HDR_PATH))'; \
1329 @echo 'Static analysers'
1330 @echo ' checkstack - Generate a list of stack hogs'
1331 @echo ' namespacecheck - Name space analysis on compiled kernel'
1332 @echo ' versioncheck - Sanity check on version.h usage'
1333 @echo ' includecheck - Check for duplicate included header files'
1334 @echo ' export_report - List the usages of all exported symbols'
1335 @echo ' headers_check - Sanity check on exported headers'
1336 @echo ' headerdep - Detect inclusion cycles in headers'
1337 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1339 @echo 'Kernel selftest'
1340 @echo ' kselftest - Build and run kernel selftest (run as root)'
1341 @echo ' Build, install, and boot kernel before'
1342 @echo ' running kselftest on it'
1343 @echo ' kselftest-clean - Remove all generated kselftest files'
1345 @echo 'Kernel packaging:'
1346 @$(MAKE) $(build)=$(package-dir) help
1348 @echo 'Documentation targets:'
1349 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1351 @echo 'Architecture specific targets ($(SRCARCH)):'
1352 @$(if $(archhelp),$(archhelp),\
1353 echo ' No architecture specific help defined for $(SRCARCH)')
1356 $(foreach b, $(boards), \
1357 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1359 @$(if $(board-dirs), \
1360 $(foreach b, $(board-dirs), \
1361 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1362 printf " %-16s - Show all of the above\\n" help-boards; \
1365 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1366 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1367 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1368 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1369 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1370 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1371 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1372 @echo ' 1: warnings which may be relevant and do not occur too often'
1373 @echo ' 2: warnings which occur quite often but may still be relevant'
1374 @echo ' 3: more obscure warnings, can most likely be ignored'
1375 @echo ' Multiple levels can be combined with W=12 or W=123'
1377 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1378 @echo 'For further info see the ./README file'
1381 help-board-dirs := $(addprefix help-,$(board-dirs))
1383 help-boards: $(help-board-dirs)
1385 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1387 $(help-board-dirs): help-%:
1388 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1389 @$(if $(boards-per-dir), \
1390 $(foreach b, $(boards-per-dir), \
1391 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1395 # Documentation targets
1396 # ---------------------------------------------------------------------------
1397 %docs: scripts_basic FORCE
1398 $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1399 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1401 else # KBUILD_EXTMOD
1404 # External module support.
1405 # When building external modules the kernel used as basis is considered
1406 # read-only, and no consistency checks are made and the make
1407 # system is not used on the basis kernel. If updates are required
1408 # in the basis kernel ordinary make commands (without M=...) must
1411 # The following are the only valid targets when building external
1413 # make M=dir clean Delete all automatically generated files
1414 # make M=dir modules Make all modules in specified dir
1415 # make M=dir Same as 'make M=dir modules'
1416 # make M=dir modules_install
1417 # Install the modules built in the module directory
1418 # Assumes install directory is already created
1420 # We are always building modules
1422 PHONY += crmodverdir
1426 PHONY += $(objtree)/Module.symvers
1427 $(objtree)/Module.symvers:
1428 @test -e $(objtree)/Module.symvers || ( \
1430 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1431 echo " is missing; modules will have no dependencies and modversions."; \
1434 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1435 PHONY += $(module-dirs) modules
1436 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1437 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1439 modules: $(module-dirs)
1440 @$(kecho) ' Building modules, stage 2.';
1441 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1443 PHONY += modules_install
1444 modules_install: _emodinst_ _emodinst_post
1446 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1449 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1450 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1452 PHONY += _emodinst_post
1453 _emodinst_post: _emodinst_
1456 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1458 PHONY += $(clean-dirs) clean
1460 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1462 clean: rm-dirs := $(MODVERDIR)
1463 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1466 @echo ' Building external modules.'
1467 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1469 @echo ' modules - default target, build the module(s)'
1470 @echo ' modules_install - install the module'
1471 @echo ' clean - remove generated files in module directory only'
1475 PHONY += prepare scripts
1478 endif # KBUILD_EXTMOD
1480 clean: $(clean-dirs)
1483 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1484 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1488 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1489 -o -name '*.symtypes' -o -name 'modules.order' \
1490 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1492 -o -name '*.gcno' \) -type f -print | xargs rm -f
1494 # Generate tags for editors
1495 # ---------------------------------------------------------------------------
1496 quiet_cmd_tags = GEN $@
1497 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1499 tags TAGS cscope gtags: FORCE
1502 # Scripts to check various things for consistency
1503 # ---------------------------------------------------------------------------
1505 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1508 find $(srctree)/* $(RCS_FIND_IGNORE) \
1509 -name '*.[hcS]' -type f -print | sort \
1510 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1513 find $(srctree)/* $(RCS_FIND_IGNORE) \
1514 -name '*.[hcS]' -type f -print | sort \
1515 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1518 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1521 $(PERL) $(srctree)/scripts/namespace.pl
1524 $(PERL) $(srctree)/scripts/export_report.pl
1526 endif #ifeq ($(config-targets),1)
1527 endif #ifeq ($(mixed-targets),1)
1529 PHONY += checkstack kernelrelease kernelversion image_name
1531 # UML needs a little special treatment here. It wants to use the host
1532 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1533 # else wants $(ARCH), including people doing cross-builds, which means
1534 # that $(SUBARCH) doesn't work here.
1536 CHECKSTACK_ARCH := $(SUBARCH)
1538 CHECKSTACK_ARCH := $(ARCH)
1541 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1542 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1545 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1548 @echo $(KERNELVERSION)
1551 @echo $(KBUILD_IMAGE)
1553 # Clear a bunch of variables before executing the submake
1555 $(Q)mkdir -p $(objtree)/tools
1556 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1559 $(Q)mkdir -p $(objtree)/tools
1560 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1563 # ---------------------------------------------------------------------------
1564 # Single targets are compatible with:
1565 # - build with mixed source and output
1566 # - build with separate output dir 'make O=...'
1567 # - external modules
1569 # target-dir => where to store outputfile
1570 # build-dir => directory in kernel source tree to use
1572 ifeq ($(KBUILD_EXTMOD),)
1573 build-dir = $(patsubst %/,%,$(dir $@))
1574 target-dir = $(dir $@)
1576 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1577 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1578 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1581 %.s: %.c prepare scripts FORCE
1582 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1583 %.i: %.c prepare scripts FORCE
1584 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1585 %.o: %.c prepare scripts FORCE
1586 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1587 %.lst: %.c prepare scripts FORCE
1588 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1589 %.s: %.S prepare scripts FORCE
1590 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1591 %.o: %.S prepare scripts FORCE
1592 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1593 %.symtypes: %.c prepare scripts FORCE
1594 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1595 %.ll: %.c prepare scripts FORCE
1596 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1599 /: prepare scripts FORCE
1601 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1602 $(build)=$(build-dir)
1603 # Make sure the latest headers are built for Documentation
1604 Documentation/: headers_install
1605 %/: prepare scripts FORCE
1607 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1608 $(build)=$(build-dir)
1609 %.ko: prepare scripts FORCE
1611 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1612 $(build)=$(build-dir) $(@:.ko=.o)
1613 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1615 # FIXME Should go into a make.lib or something
1616 # ===========================================================================
1618 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1619 cmd_rmdirs = rm -rf $(rm-dirs)
1621 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1622 cmd_rmfiles = rm -f $(rm-files)
1624 # Run depmod only if we have System.map and depmod is executable
1625 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1626 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1627 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1629 # Create temporary dir for module support files
1630 # clean it up only when building all modules
1631 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1632 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1634 # read all saved command lines
1636 targets := $(wildcard $(sort $(targets)))
1637 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1639 ifneq ($(cmd_files),)
1640 $(cmd_files): ; # Do not try to update included dependency files
1641 include $(cmd_files)
1644 endif # skip-makefile
1649 # Declare the contents of the .PHONY variable as phony. We keep that
1650 # information in a variable so we can use it in if_changed and friends.