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))),)
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
309 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
310 HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
311 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
314 # Decide whether to build built-in, modular, or both.
315 # Normally, just do built-in.
320 # If we have only "make modules", don't compile built-in objects.
321 # When we're building modules with modversions, we need to consider
322 # the built-in objects during the descend as well, in order to
323 # make sure the checksums are up to date before we record them.
325 ifeq ($(MAKECMDGOALS),modules)
326 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
329 # If we have "make <whatever> modules", compile modules
330 # in addition to whatever we do anyway.
331 # Just "make" or "make all" shall build modules as well
333 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
337 ifeq ($(MAKECMDGOALS),)
341 export KBUILD_MODULES KBUILD_BUILTIN
342 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
344 # We need some generic definitions (do not try to remake the file).
345 scripts/Kbuild.include: ;
346 include scripts/Kbuild.include
348 # Make variables (CC, etc...)
349 AS = $(CROSS_COMPILE)as
350 LD = $(CROSS_COMPILE)ld
351 REAL_CC = $(CROSS_COMPILE)gcc
353 AR = $(CROSS_COMPILE)ar
354 NM = $(CROSS_COMPILE)nm
355 STRIP = $(CROSS_COMPILE)strip
356 OBJCOPY = $(CROSS_COMPILE)objcopy
357 OBJDUMP = $(CROSS_COMPILE)objdump
359 GENKSYMS = scripts/genksyms/genksyms
360 INSTALLKERNEL := installkernel
361 DEPMOD = /sbin/depmod
366 # Use the wrapper for the compiler. This wrapper scans for new
367 # warnings and causes the build to stop upon encountering them.
368 CC = $(srctree)/scripts/gcc-wrapper.py $(REAL_CC)
370 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
371 -Wbitwise -Wno-return-void $(CF)
377 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage -fno-tree-loop-im
378 CFLAGS_KCOV = -fsanitize-coverage=trace-pc
381 # Use USERINCLUDE when you must reference the UAPI directories only.
383 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
384 -Iarch/$(hdr-arch)/include/generated/uapi \
385 -I$(srctree)/include/uapi \
386 -Iinclude/generated/uapi \
387 -include $(srctree)/include/linux/kconfig.h
389 # Use LINUXINCLUDE when you must reference the include/ directory.
390 # Needed to be compatible with the O= option
392 -I$(srctree)/arch/$(hdr-arch)/include \
393 -Iarch/$(hdr-arch)/include/generated/uapi \
394 -Iarch/$(hdr-arch)/include/generated \
395 $(if $(KBUILD_SRC), -I$(srctree)/include) \
399 KBUILD_CPPFLAGS := -D__KERNEL__
401 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
402 -fno-strict-aliasing -fno-common \
403 -Werror-implicit-function-declaration \
404 -Wno-format-security \
405 -std=gnu89 $(call cc-option,-fno-PIE)
407 ifeq ($(TARGET_BOARD_TYPE),auto)
408 KBUILD_CFLAGS += -DCONFIG_PLATFORM_AUTO
410 KBUILD_AFLAGS_KERNEL :=
411 KBUILD_CFLAGS_KERNEL :=
412 KBUILD_AFLAGS := -D__ASSEMBLY__ $(call cc-option,-fno-PIE)
413 KBUILD_AFLAGS_MODULE := -DMODULE
414 KBUILD_CFLAGS_MODULE := -DMODULE
415 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
417 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
418 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
419 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
421 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
422 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
423 export CPP AR NM STRIP OBJCOPY OBJDUMP
424 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
425 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
427 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
428 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
429 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
430 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
431 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
432 export KBUILD_ARFLAGS
434 # When compiling out-of-tree modules, put MODVERDIR in the module
435 # tree rather than in the kernel tree. The kernel tree might
437 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
439 # Files to ignore in find ... statements
441 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
442 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
444 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
445 --exclude CVS --exclude .pc --exclude .hg --exclude .git
447 # ===========================================================================
448 # Rules shared between *config targets and build targets
450 # Basic helpers built in scripts/
451 PHONY += scripts_basic
453 $(Q)$(MAKE) $(build)=scripts/basic
454 $(Q)rm -f .tmp_quiet_recordmcount
456 # To avoid any implicit rule to kick in, define an empty command.
457 scripts/basic/%: scripts_basic ;
459 PHONY += outputmakefile
460 # outputmakefile generates a Makefile in the output directory, if using a
461 # separate output directory. This allows convenient use of make in the
464 ifneq ($(KBUILD_SRC),)
465 $(Q)ln -fsn $(srctree) source
466 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
467 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
470 # Support for using generic headers in asm-generic
473 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
474 src=asm obj=arch/$(SRCARCH)/include/generated/asm
475 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
476 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
478 # To make sure we do not include .config for any of the *config targets
479 # catch them early, and hand them over to scripts/kconfig/Makefile
480 # It is allowed to specify more targets when calling make, including
481 # mixing *config targets and build targets.
482 # For example 'make oldconfig all'.
483 # Detect when mixed targets is specified, and make a second invocation
484 # of make so .config is not included in this case either (for *config).
486 version_h := include/generated/uapi/linux/version.h
487 old_version_h := include/linux/version.h
489 no-dot-config-targets := clean mrproper distclean \
490 cscope gtags TAGS tags help% %docs check% coccicheck \
491 $(version_h) headers_% archheaders archscripts \
492 kernelversion %src-pkg
498 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
499 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
504 ifeq ($(KBUILD_EXTMOD),)
505 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
507 ifneq ($(words $(MAKECMDGOALS)),1)
512 # install and module_install need also be processed one by one
513 ifneq ($(filter install,$(MAKECMDGOALS)),)
514 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
519 ifeq ($(mixed-targets),1)
520 # ===========================================================================
521 # We're called with mixed targets (*config and build targets).
522 # Handle them one by one.
524 PHONY += $(MAKECMDGOALS) __build_one_by_one
526 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
531 for i in $(MAKECMDGOALS); do \
532 $(MAKE) -f $(srctree)/Makefile $$i; \
536 ifeq ($(config-targets),1)
537 # ===========================================================================
538 # *config targets only - make sure prerequisites are updated, and descend
539 # in scripts/kconfig to make the *config target
541 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
542 # KBUILD_DEFCONFIG may point out an alternative default configuration
543 # used for 'make defconfig'
544 include arch/$(SRCARCH)/Makefile
545 export KBUILD_DEFCONFIG KBUILD_KCONFIG
547 config: scripts_basic outputmakefile FORCE
548 $(Q)$(MAKE) $(build)=scripts/kconfig $@
550 %config: scripts_basic outputmakefile FORCE
551 $(Q)$(MAKE) $(build)=scripts/kconfig $@
554 # ===========================================================================
555 # Build targets only - this includes vmlinux, arch specific targets, clean
556 # targets and others. In general all targets except *config targets.
558 ifeq ($(KBUILD_EXTMOD),)
559 # Additional helpers built in scripts/
560 # Carefully list dependencies so we do not try to build scripts twice
563 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
565 $(Q)$(MAKE) $(build)=$(@)
567 # Objects we will link into vmlinux / subdirs we need to visit
569 drivers-y := drivers/ sound/ firmware/
574 endif # KBUILD_EXTMOD
576 ifeq ($(dot-config),1)
578 -include include/config/auto.conf
580 ifeq ($(KBUILD_EXTMOD),)
581 # Read in dependencies to all Kconfig* files, make sure to run
582 # oldconfig if changes are detected.
583 -include include/config/auto.conf.cmd
585 # To avoid any implicit rule to kick in, define an empty command
586 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
588 # If .config is newer than include/config/auto.conf, someone tinkered
589 # with it and forgot to run make oldconfig.
590 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
591 # we execute the config step to be sure to catch updated Kconfig files
592 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
593 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
595 # external modules needs include/generated/autoconf.h and include/config/auto.conf
596 # but do not care if they are up-to-date. Use auto.conf to trigger the test
597 PHONY += include/config/auto.conf
599 include/config/auto.conf:
600 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
602 echo >&2 " ERROR: Kernel configuration is invalid."; \
603 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
604 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
608 endif # KBUILD_EXTMOD
611 # Dummy target needed, because used as prerequisite
612 include/config/auto.conf: ;
613 endif # $(dot-config)
615 # The all: target is the default when no target is given on the
617 # This allow a user to issue only 'make' to build a kernel including modules
618 # Defaults to vmlinux, but the arch makefile usually adds further targets
621 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
622 # values of the respective KBUILD_* variables
626 include arch/$(SRCARCH)/Makefile
628 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
629 KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,)
630 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
631 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
632 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
633 KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context)
635 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
636 KBUILD_CFLAGS += $(call cc-option,-Oz,-Os)
638 ifdef CONFIG_PROFILE_ALL_BRANCHES
645 # Tell gcc to never replace conditional load with a non-conditional one
646 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
648 # check for 'asm goto'
649 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
650 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
651 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
654 ifdef CONFIG_READABLE_ASM
655 # Disable optimizations that make assembler listings hard to read.
656 # reorder blocks reorders the control in the function
657 # ipa clone creates specialized cloned functions
658 # partial inlining inlines only parts of functions
659 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
660 $(call cc-option,-fno-ipa-cp-clone,) \
661 $(call cc-option,-fno-partial-inlining)
664 ifneq ($(CONFIG_FRAME_WARN),0)
665 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
668 # Handle stack protector mode.
670 # Since kbuild can potentially perform two passes (first with the old
671 # .config values and then with updated .config values), we cannot error out
672 # if a desired compiler option is unsupported. If we were to error, kbuild
673 # could never get to the second pass and actually notice that we changed
674 # the option to something that was supported.
676 # Additionally, we don't want to fallback and/or silently change which compiler
677 # flags will be used, since that leads to producing kernels with different
678 # security feature characteristics depending on the compiler used. ("But I
679 # selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
681 # The middle ground is to warn here so that the failed option is obvious, but
682 # to let the build fail with bad compiler flags so that we can't produce a
683 # kernel when there is a CONFIG and compiler mismatch.
685 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
686 stackp-flag := -fstack-protector
687 ifeq ($(call cc-option, $(stackp-flag)),)
688 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
689 -fstack-protector not supported by compiler)
692 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
693 stackp-flag := -fstack-protector-strong
694 ifeq ($(call cc-option, $(stackp-flag)),)
695 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
696 -fstack-protector-strong not supported by compiler)
699 # Force off for distro compilers that enable stack protector by default.
700 stackp-flag := $(call cc-option, -fno-stack-protector)
703 KBUILD_CFLAGS += $(stackp-flag)
706 ifeq ($(call cc-option, $(CFLAGS_KCOV)),)
707 $(warning Cannot use CONFIG_KCOV: \
708 -fsanitize-coverage=trace-pc is not supported by compiler)
713 ifeq ($(cc-name),clang)
714 ifneq ($(CROSS_COMPILE),)
715 CLANG_TRIPLE ?= $(CROSS_COMPILE)
716 CLANG_TARGET := --target=$(notdir $(CLANG_TRIPLE:%-=%))
717 GCC_TOOLCHAIN := $(realpath $(dir $(shell which $(LD)))/..)
719 ifneq ($(GCC_TOOLCHAIN),)
720 CLANG_GCC_TC := --gcc-toolchain=$(GCC_TOOLCHAIN)
722 KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
723 KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
724 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
725 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
726 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
727 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
728 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
729 KBUILD_CFLAGS += $(call cc-disable-warning, duplicate-decl-specifier)
730 # Quiet clang warning: comparison of unsigned expression < 0 is always false
731 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
732 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
733 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
734 # See modpost pattern 2
735 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
736 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
737 KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
738 KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
741 # These warnings generated too much noise in a regular build.
742 # Use make W=1 to enable them (see scripts/Makefile.build)
743 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
744 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
747 ifdef CONFIG_FRAME_POINTER
748 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
750 # Some targets (ARM with Thumb2, for example), can't be built with frame
751 # pointers. For those, we don't have FUNCTION_TRACER automatically
752 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
753 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
754 # -fomit-frame-pointer with FUNCTION_TRACER.
755 ifndef CONFIG_FUNCTION_TRACER
756 KBUILD_CFLAGS += -fomit-frame-pointer
760 KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
762 ifdef CONFIG_DEBUG_INFO
763 ifdef CONFIG_DEBUG_INFO_SPLIT
764 KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
768 KBUILD_AFLAGS += -Wa,-gdwarf-2
770 ifdef CONFIG_DEBUG_INFO_DWARF4
771 KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
774 ifdef CONFIG_DEBUG_INFO_REDUCED
775 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
776 $(call cc-option,-fno-var-tracking)
779 ifdef CONFIG_FUNCTION_TRACER
780 ifndef CC_FLAGS_FTRACE
781 CC_FLAGS_FTRACE := -pg
783 export CC_FLAGS_FTRACE
784 ifdef CONFIG_HAVE_FENTRY
785 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
787 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
788 KBUILD_AFLAGS += $(CC_USING_FENTRY)
789 ifdef CONFIG_DYNAMIC_FTRACE
790 ifdef CONFIG_HAVE_C_RECORDMCOUNT
791 BUILD_C_RECORDMCOUNT := y
792 export BUILD_C_RECORDMCOUNT
797 # We trigger additional mismatches with less inlining
798 ifdef CONFIG_DEBUG_SECTION_MISMATCH
799 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
802 # arch Makefile may override CC so keep this after arch Makefile is included
803 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
804 CHECKFLAGS += $(NOSTDINC_FLAGS)
806 # warn about C99 declaration after statement
807 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
809 # disable pointer signed / unsigned warnings in gcc 4.0
810 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
812 # disable invalid "can't wrap" optimizations for signed / pointers
813 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
815 # clang sets -fmerge-all-constants by default as optimization, but this
816 # is non-conforming behavior for C and in fact breaks the kernel, so we
817 # need to disable it here generally.
818 KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants)
820 # for gcc -fno-merge-all-constants disables everything, but it is fine
821 # to have actual conforming behavior enabled.
822 KBUILD_CFLAGS += $(call cc-option,-fmerge-constants)
824 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
825 KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,)
827 # conserve stack if available
828 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
830 # disallow errors like 'EXPORT_GPL(foo);' with missing header
831 KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
833 # require functions to have arguments in prototypes, not empty 'int foo()'
834 KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
836 # Prohibit date/time macros, which would make the build non-deterministic
837 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
839 # use the deterministic mode of AR if available
840 KBUILD_ARFLAGS := $(call ar-option,D)
842 include scripts/Makefile.kasan
843 include scripts/Makefile.extrawarn
844 include scripts/Makefile.ubsan
846 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
848 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
849 KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
850 KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
852 # Use --build-id when available.
853 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
854 $(call cc-ldoption, -Wl$(comma)--build-id,))
855 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
856 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
858 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
859 LDFLAGS_vmlinux += $(call ld-option, -X,)
862 # Default kernel image to build when no specific target is given.
863 # KBUILD_IMAGE may be overruled on the command line or
864 # set in the environment
865 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
867 export KBUILD_IMAGE ?= vmlinux
870 # INSTALL_PATH specifies where to place the updated kernel and system map
871 # images. Default is /boot, but you can set it to other values
872 export INSTALL_PATH ?= /boot
875 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
876 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
877 # an argument if needed. Otherwise it defaults to the kernel install path
879 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
882 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
883 # relocations required by build roots. This is not defined in the
884 # makefile but the argument can be passed to make if needed.
887 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
891 # INSTALL_MOD_STRIP, if defined, will cause modules to be
892 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
893 # the default option --strip-debug will be used. Otherwise,
894 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
896 ifdef INSTALL_MOD_STRIP
897 ifeq ($(INSTALL_MOD_STRIP),1)
898 mod_strip_cmd = $(STRIP) --strip-debug
900 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
901 endif # INSTALL_MOD_STRIP=1
904 endif # INSTALL_MOD_STRIP
907 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
908 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
909 # or CONFIG_MODULE_COMPRESS_XZ.
911 mod_compress_cmd = true
912 ifdef CONFIG_MODULE_COMPRESS
913 ifdef CONFIG_MODULE_COMPRESS_GZIP
914 mod_compress_cmd = gzip -n -f
915 endif # CONFIG_MODULE_COMPRESS_GZIP
916 ifdef CONFIG_MODULE_COMPRESS_XZ
917 mod_compress_cmd = xz -f
918 endif # CONFIG_MODULE_COMPRESS_XZ
919 endif # CONFIG_MODULE_COMPRESS
920 export mod_compress_cmd
922 # Select initial ramdisk compression format, default is gzip(1).
923 # This shall be used by the dracut(8) tool while creating an initramfs image.
925 INITRD_COMPRESS-y := gzip
926 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
927 INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
928 INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
929 INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
930 INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
931 # do not export INITRD_COMPRESS, since we didn't actually
932 # choose a sane default compression above.
933 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
935 ifdef CONFIG_MODULE_SIG_ALL
936 $(eval $(call config_filename,MODULE_SIG_KEY))
938 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
945 ifeq ($(KBUILD_EXTMOD),)
946 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
948 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
949 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
950 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
952 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
953 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
955 init-y := $(patsubst %/, %/built-in.o, $(init-y))
956 core-y := $(patsubst %/, %/built-in.o, $(core-y))
957 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
958 net-y := $(patsubst %/, %/built-in.o, $(net-y))
959 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
960 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
961 libs-y := $(libs-y1) $(libs-y2)
962 virt-y := $(patsubst %/, %/built-in.o, $(virt-y))
964 # Externally visible symbols (used by link-vmlinux.sh)
965 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
966 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
967 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
968 export LDFLAGS_vmlinux
969 # used by scripts/pacmage/Makefile
970 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
972 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
974 # Final link of vmlinux
975 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
976 quiet_cmd_link-vmlinux = LINK $@
978 # Include targets which we want to
979 # execute if the rest of the kernel build went well.
980 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
981 ifdef CONFIG_HEADERS_CHECK
982 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
985 $(Q)$(MAKE) $(build)=samples
987 ifdef CONFIG_BUILD_DOCSRC
988 $(Q)$(MAKE) $(build)=Documentation
990 ifdef CONFIG_GDB_SCRIPTS
991 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
993 +$(call if_changed,link-vmlinux)
995 # The actual objects are generated when descending,
996 # make sure no implicit rule kicks in
997 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
999 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1000 # Preset locale variables to speed up the build process. Limit locale
1001 # tweaks to this spot to avoid wrong language settings when running
1002 # make menuconfig etc.
1003 # Error messages still appears in the original language
1005 PHONY += $(vmlinux-dirs)
1006 $(vmlinux-dirs): prepare scripts
1007 $(Q)$(MAKE) $(build)=$@
1009 define filechk_kernel.release
1010 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1013 # Store (new) KERNELRELEASE string in include/config/kernel.release
1014 include/config/kernel.release: include/config/auto.conf FORCE
1015 $(call filechk,kernel.release)
1018 # Things we need to do before we recursively start building the kernel
1019 # or the modules are listed in "prepare".
1020 # A multi level approach is used. prepareN is processed before prepareN-1.
1021 # archprepare is used in arch Makefiles and when processed asm symlink,
1022 # version.h and scripts_basic is processed / created.
1024 # Listed in dependency order
1025 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1027 # prepare3 is used to check if we are building in a separate output directory,
1029 # 1) Check that make has not been executed in the kernel src $(srctree)
1030 prepare3: include/config/kernel.release
1031 ifneq ($(KBUILD_SRC),)
1032 @$(kecho) ' Using $(srctree) as source for kernel'
1033 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1034 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1035 echo >&2 " in the '$(srctree)' directory.";\
1040 # prepare2 creates a makefile if using a separate output directory
1041 prepare2: prepare3 outputmakefile asm-generic
1043 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1044 include/config/auto.conf
1047 archprepare: archheaders archscripts prepare1 scripts_basic
1049 prepare0: archprepare
1050 $(Q)$(MAKE) $(build)=.
1052 # All the preparing..
1055 # Generate some files
1056 # ---------------------------------------------------------------------------
1058 # KERNELRELEASE can change from a few different places, meaning version.h
1059 # needs to be updated, so this check is forced on all builds
1062 define filechk_utsrelease.h
1063 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1064 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1067 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1070 define filechk_version.h
1071 (echo \#define LINUX_VERSION_CODE $(shell \
1072 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1073 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1076 $(version_h): $(srctree)/Makefile FORCE
1077 $(call filechk,version.h)
1078 $(Q)rm -f $(old_version_h)
1080 include/generated/utsrelease.h: include/config/kernel.release FORCE
1081 $(call filechk,utsrelease.h)
1085 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1086 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1088 # ---------------------------------------------------------------------------
1090 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1091 export INSTALL_FW_PATH
1093 PHONY += firmware_install
1095 @mkdir -p $(objtree)/firmware
1096 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1098 # ---------------------------------------------------------------------------
1101 #Default location for installed headers
1102 export INSTALL_HDR_PATH = $(objtree)/usr
1104 # If we do an all arch process set dst to asm-$(hdr-arch)
1105 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1107 PHONY += archheaders
1110 PHONY += archscripts
1114 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts
1115 $(Q)$(MAKE) $(build)=scripts build_unifdef
1117 PHONY += headers_install_all
1118 headers_install_all:
1119 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1121 PHONY += headers_install
1122 headers_install: __headers
1123 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1124 $(error Headers not exportable for the $(SRCARCH) architecture))
1125 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1126 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1128 PHONY += headers_check_all
1129 headers_check_all: headers_install_all
1130 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1132 PHONY += headers_check
1133 headers_check: headers_install
1134 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1135 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1137 # ---------------------------------------------------------------------------
1142 $(Q)$(MAKE) -C tools/testing/selftests run_tests
1145 $(Q)$(MAKE) -C tools/testing/selftests clean
1147 # ---------------------------------------------------------------------------
1150 ifdef CONFIG_MODULES
1152 # By default, build modules as well
1158 # A module can be listed more than once in obj-m resulting in
1159 # duplicate lines in modules.order files. Those are removed
1160 # using awk while concatenating to the final file.
1163 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1164 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1165 @$(kecho) ' Building modules, stage 2.';
1166 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1167 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1169 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1170 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1172 %/modules.builtin: include/config/auto.conf
1173 $(Q)$(MAKE) $(modbuiltin)=$*
1176 # Target to prepare building external modules
1177 PHONY += modules_prepare
1178 modules_prepare: prepare scripts
1180 # Target to install modules
1181 PHONY += modules_install
1182 modules_install: _modinst_ _modinst_post
1186 @rm -rf $(MODLIB)/kernel
1187 @rm -f $(MODLIB)/source
1188 @mkdir -p $(MODLIB)/kernel
1189 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1190 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1191 rm -f $(MODLIB)/build ; \
1192 ln -s $(CURDIR) $(MODLIB)/build ; \
1194 @cp -f $(objtree)/modules.order $(MODLIB)/
1195 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1196 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1198 # This depmod is only for convenience to give the initial
1199 # boot a modules.dep even before / is mounted read-write. However the
1200 # boot script depmod is the master version.
1201 PHONY += _modinst_post
1202 _modinst_post: _modinst_
1203 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1206 ifeq ($(CONFIG_MODULE_SIG), y)
1207 PHONY += modules_sign
1209 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1212 else # CONFIG_MODULES
1214 # Modules not configured
1215 # ---------------------------------------------------------------------------
1217 modules modules_install: FORCE
1219 @echo >&2 "The present kernel configuration has modules disabled."
1220 @echo >&2 "Type 'make config' and enable loadable module support."
1221 @echo >&2 "Then build a kernel with module support enabled."
1225 endif # CONFIG_MODULES
1228 # Cleaning is done on three levels.
1229 # make clean Delete most generated files
1230 # Leave enough to build external modules
1231 # make mrproper Delete the current configuration, and all generated files
1232 # make distclean Remove editor backup files, patch leftover files and the like
1234 # Directories & files removed with 'make clean'
1235 CLEAN_DIRS += $(MODVERDIR)
1237 # Directories & files removed with 'make mrproper'
1238 MRPROPER_DIRS += include/config usr/include include/generated \
1239 arch/*/include/generated .tmp_objdiff
1240 MRPROPER_FILES += .config .config.old .version .old_version \
1241 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1242 signing_key.pem signing_key.priv signing_key.x509 \
1243 x509.genkey extra_certificates signing_key.x509.keyid \
1244 signing_key.x509.signer vmlinux-gdb.py
1246 # clean - Delete most, but leave enough to build external modules
1248 clean: rm-dirs := $(CLEAN_DIRS)
1249 clean: rm-files := $(CLEAN_FILES)
1250 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1252 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1254 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1257 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1259 clean: archclean vmlinuxclean
1261 # mrproper - Delete all generated files, including .config
1263 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1264 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1265 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1267 PHONY += $(mrproper-dirs) mrproper archmrproper
1269 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1271 mrproper: clean archmrproper $(mrproper-dirs)
1280 @find $(srctree) $(RCS_FIND_IGNORE) \
1281 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1282 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1283 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
1284 -type f -print | xargs rm -f
1287 # Packaging of the kernel to various formats
1288 # ---------------------------------------------------------------------------
1289 # rpm target kept for backward compatibility
1290 package-dir := scripts/package
1293 $(Q)$(MAKE) $(build)=$(package-dir) $@
1294 %pkg: include/config/kernel.release FORCE
1295 $(Q)$(MAKE) $(build)=$(package-dir) $@
1296 rpm: include/config/kernel.release FORCE
1297 $(Q)$(MAKE) $(build)=$(package-dir) $@
1300 # Brief documentation of the typical targets used
1301 # ---------------------------------------------------------------------------
1303 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1304 boards := $(sort $(notdir $(boards)))
1305 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1306 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1309 @echo 'Cleaning targets:'
1310 @echo ' clean - Remove most generated files but keep the config and'
1311 @echo ' enough build support to build external modules'
1312 @echo ' mrproper - Remove all generated files + config + various backup files'
1313 @echo ' distclean - mrproper + remove editor backup and patch files'
1315 @echo 'Configuration targets:'
1316 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1318 @echo 'Other generic targets:'
1319 @echo ' all - Build all targets marked with [*]'
1320 @echo '* vmlinux - Build the bare kernel'
1321 @echo '* modules - Build all modules'
1322 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1323 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1324 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1325 @echo ' dir/ - Build all files in dir and below'
1326 @echo ' dir/file.[ois] - Build specified target only'
1327 @echo ' dir/file.ll - Build the LLVM assembly file'
1328 @echo ' (requires compiler support for LLVM assembly generation)'
1329 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1330 @echo ' (requires a recent binutils and recent build (System.map))'
1331 @echo ' dir/file.ko - Build module including final link'
1332 @echo ' modules_prepare - Set up for building external modules'
1333 @echo ' tags/TAGS - Generate tags file for editors'
1334 @echo ' cscope - Generate cscope index'
1335 @echo ' gtags - Generate GNU GLOBAL index'
1336 @echo ' kernelrelease - Output the release version string (use with make -s)'
1337 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1338 @echo ' image_name - Output the image name (use with make -s)'
1339 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1340 echo ' (default: $(INSTALL_HDR_PATH))'; \
1342 @echo 'Static analysers'
1343 @echo ' checkstack - Generate a list of stack hogs'
1344 @echo ' namespacecheck - Name space analysis on compiled kernel'
1345 @echo ' versioncheck - Sanity check on version.h usage'
1346 @echo ' includecheck - Check for duplicate included header files'
1347 @echo ' export_report - List the usages of all exported symbols'
1348 @echo ' headers_check - Sanity check on exported headers'
1349 @echo ' headerdep - Detect inclusion cycles in headers'
1350 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1352 @echo 'Kernel selftest'
1353 @echo ' kselftest - Build and run kernel selftest (run as root)'
1354 @echo ' Build, install, and boot kernel before'
1355 @echo ' running kselftest on it'
1356 @echo ' kselftest-clean - Remove all generated kselftest files'
1358 @echo 'Kernel packaging:'
1359 @$(MAKE) $(build)=$(package-dir) help
1361 @echo 'Documentation targets:'
1362 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1364 @echo 'Architecture specific targets ($(SRCARCH)):'
1365 @$(if $(archhelp),$(archhelp),\
1366 echo ' No architecture specific help defined for $(SRCARCH)')
1369 $(foreach b, $(boards), \
1370 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1372 @$(if $(board-dirs), \
1373 $(foreach b, $(board-dirs), \
1374 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1375 printf " %-16s - Show all of the above\\n" help-boards; \
1378 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1379 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1380 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1381 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1382 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1383 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1384 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1385 @echo ' 1: warnings which may be relevant and do not occur too often'
1386 @echo ' 2: warnings which occur quite often but may still be relevant'
1387 @echo ' 3: more obscure warnings, can most likely be ignored'
1388 @echo ' Multiple levels can be combined with W=12 or W=123'
1390 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1391 @echo 'For further info see the ./README file'
1394 help-board-dirs := $(addprefix help-,$(board-dirs))
1396 help-boards: $(help-board-dirs)
1398 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1400 $(help-board-dirs): help-%:
1401 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1402 @$(if $(boards-per-dir), \
1403 $(foreach b, $(boards-per-dir), \
1404 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1408 # Documentation targets
1409 # ---------------------------------------------------------------------------
1410 %docs: scripts_basic FORCE
1411 $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1412 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1414 else # KBUILD_EXTMOD
1417 # External module support.
1418 # When building external modules the kernel used as basis is considered
1419 # read-only, and no consistency checks are made and the make
1420 # system is not used on the basis kernel. If updates are required
1421 # in the basis kernel ordinary make commands (without M=...) must
1424 # The following are the only valid targets when building external
1426 # make M=dir clean Delete all automatically generated files
1427 # make M=dir modules Make all modules in specified dir
1428 # make M=dir Same as 'make M=dir modules'
1429 # make M=dir modules_install
1430 # Install the modules built in the module directory
1431 # Assumes install directory is already created
1433 # We are always building modules
1435 PHONY += crmodverdir
1439 PHONY += $(objtree)/Module.symvers
1440 $(objtree)/Module.symvers:
1441 @test -e $(objtree)/Module.symvers || ( \
1443 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1444 echo " is missing; modules will have no dependencies and modversions."; \
1447 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1448 PHONY += $(module-dirs) modules
1449 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1450 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1452 modules: $(module-dirs)
1453 @$(kecho) ' Building modules, stage 2.';
1454 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1456 PHONY += modules_install
1457 modules_install: _emodinst_ _emodinst_post
1459 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1462 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1463 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1465 PHONY += _emodinst_post
1466 _emodinst_post: _emodinst_
1469 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1471 PHONY += $(clean-dirs) clean
1473 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1475 clean: rm-dirs := $(MODVERDIR)
1476 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1479 @echo ' Building external modules.'
1480 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1482 @echo ' modules - default target, build the module(s)'
1483 @echo ' modules_install - install the module'
1484 @echo ' clean - remove generated files in module directory only'
1488 PHONY += prepare scripts
1491 endif # KBUILD_EXTMOD
1493 clean: $(clean-dirs)
1496 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1497 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1501 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1502 -o -name '*.symtypes' -o -name 'modules.order' \
1503 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1505 -o -name '*.gcno' \) -type f -print | xargs rm -f
1507 # Generate tags for editors
1508 # ---------------------------------------------------------------------------
1509 quiet_cmd_tags = GEN $@
1510 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1512 tags TAGS cscope gtags: FORCE
1515 # Scripts to check various things for consistency
1516 # ---------------------------------------------------------------------------
1518 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1521 find $(srctree)/* $(RCS_FIND_IGNORE) \
1522 -name '*.[hcS]' -type f -print | sort \
1523 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1526 find $(srctree)/* $(RCS_FIND_IGNORE) \
1527 -name '*.[hcS]' -type f -print | sort \
1528 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1531 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1534 $(PERL) $(srctree)/scripts/namespace.pl
1537 $(PERL) $(srctree)/scripts/export_report.pl
1539 endif #ifeq ($(config-targets),1)
1540 endif #ifeq ($(mixed-targets),1)
1542 PHONY += checkstack kernelrelease kernelversion image_name
1544 # UML needs a little special treatment here. It wants to use the host
1545 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1546 # else wants $(ARCH), including people doing cross-builds, which means
1547 # that $(SUBARCH) doesn't work here.
1549 CHECKSTACK_ARCH := $(SUBARCH)
1551 CHECKSTACK_ARCH := $(ARCH)
1554 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1555 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1558 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1561 @echo $(KERNELVERSION)
1564 @echo $(KBUILD_IMAGE)
1566 # Clear a bunch of variables before executing the submake
1568 $(Q)mkdir -p $(objtree)/tools
1569 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1572 $(Q)mkdir -p $(objtree)/tools
1573 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1576 # ---------------------------------------------------------------------------
1577 # Single targets are compatible with:
1578 # - build with mixed source and output
1579 # - build with separate output dir 'make O=...'
1580 # - external modules
1582 # target-dir => where to store outputfile
1583 # build-dir => directory in kernel source tree to use
1585 ifeq ($(KBUILD_EXTMOD),)
1586 build-dir = $(patsubst %/,%,$(dir $@))
1587 target-dir = $(dir $@)
1589 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1590 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1591 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1594 %.s: %.c prepare scripts FORCE
1595 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1596 %.i: %.c prepare scripts FORCE
1597 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1598 %.o: %.c prepare scripts FORCE
1599 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1600 %.lst: %.c prepare scripts FORCE
1601 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1602 %.s: %.S prepare scripts FORCE
1603 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1604 %.o: %.S prepare scripts FORCE
1605 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1606 %.symtypes: %.c prepare scripts FORCE
1607 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1608 %.ll: %.c prepare scripts FORCE
1609 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1612 /: prepare scripts FORCE
1614 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1615 $(build)=$(build-dir)
1616 # Make sure the latest headers are built for Documentation
1617 Documentation/: headers_install
1618 %/: prepare scripts FORCE
1620 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1621 $(build)=$(build-dir)
1622 %.ko: prepare scripts FORCE
1624 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1625 $(build)=$(build-dir) $(@:.ko=.o)
1626 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1628 # FIXME Should go into a make.lib or something
1629 # ===========================================================================
1631 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1632 cmd_rmdirs = rm -rf $(rm-dirs)
1634 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1635 cmd_rmfiles = rm -f $(rm-files)
1637 # Run depmod only if we have System.map and depmod is executable
1638 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1639 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1640 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1642 # Create temporary dir for module support files
1643 # clean it up only when building all modules
1644 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1645 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1647 # read all saved command lines
1649 targets := $(wildcard $(sort $(targets)))
1650 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1652 ifneq ($(cmd_files),)
1653 $(cmd_files): ; # Do not try to update included dependency files
1654 include $(cmd_files)
1657 endif # skip-makefile
1662 # Declare the contents of the .PHONY variable as phony. We keep that
1663 # information in a variable so we can use it in if_changed and friends.