5 NAME = Psychotic Stoned Sheep
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 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 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
365 -Wbitwise -Wno-return-void $(CF)
371 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage -fno-tree-loop-im -Wno-maybe-uninitialized
372 CFLAGS_KCOV := $(call cc-option,-fsanitize-coverage=trace-pc,)
375 # Use USERINCLUDE when you must reference the UAPI directories only.
377 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
378 -Iarch/$(hdr-arch)/include/generated/uapi \
379 -I$(srctree)/include/uapi \
380 -Iinclude/generated/uapi \
381 -include $(srctree)/include/linux/kconfig.h
383 # Use LINUXINCLUDE when you must reference the include/ directory.
384 # Needed to be compatible with the O= option
386 -I$(srctree)/arch/$(hdr-arch)/include \
387 -Iarch/$(hdr-arch)/include/generated/uapi \
388 -Iarch/$(hdr-arch)/include/generated \
389 $(if $(KBUILD_SRC), -I$(srctree)/include) \
393 KBUILD_CPPFLAGS := -D__KERNEL__
395 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
396 -fno-strict-aliasing -fno-common \
397 -Werror-implicit-function-declaration \
398 -Wno-format-security \
401 KBUILD_AFLAGS_KERNEL :=
402 KBUILD_CFLAGS_KERNEL :=
403 KBUILD_AFLAGS := -D__ASSEMBLY__
404 KBUILD_AFLAGS_MODULE := -DMODULE
405 KBUILD_CFLAGS_MODULE := -DMODULE
406 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
408 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
409 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
410 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
412 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
413 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
414 export CPP AR NM STRIP OBJCOPY OBJDUMP
415 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
416 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
418 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
419 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
420 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
421 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
422 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
423 export KBUILD_ARFLAGS
425 # When compiling out-of-tree modules, put MODVERDIR in the module
426 # tree rather than in the kernel tree. The kernel tree might
428 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
430 # Files to ignore in find ... statements
432 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
433 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
435 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
436 --exclude CVS --exclude .pc --exclude .hg --exclude .git
438 # ===========================================================================
439 # Rules shared between *config targets and build targets
441 # Basic helpers built in scripts/
442 PHONY += scripts_basic
444 $(Q)$(MAKE) $(build)=scripts/basic
445 $(Q)rm -f .tmp_quiet_recordmcount
447 # To avoid any implicit rule to kick in, define an empty command.
448 scripts/basic/%: scripts_basic ;
450 PHONY += outputmakefile
451 # outputmakefile generates a Makefile in the output directory, if using a
452 # separate output directory. This allows convenient use of make in the
455 ifneq ($(KBUILD_SRC),)
456 $(Q)ln -fsn $(srctree) source
457 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
458 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
461 # Support for using generic headers in asm-generic
464 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
465 src=asm obj=arch/$(SRCARCH)/include/generated/asm
466 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
467 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
469 # To make sure we do not include .config for any of the *config targets
470 # catch them early, and hand them over to scripts/kconfig/Makefile
471 # It is allowed to specify more targets when calling make, including
472 # mixing *config targets and build targets.
473 # For example 'make oldconfig all'.
474 # Detect when mixed targets is specified, and make a second invocation
475 # of make so .config is not included in this case either (for *config).
477 version_h := include/generated/uapi/linux/version.h
478 old_version_h := include/linux/version.h
480 no-dot-config-targets := clean mrproper distclean \
481 cscope gtags TAGS tags help% %docs check% coccicheck \
482 $(version_h) headers_% archheaders archscripts \
483 kernelversion %src-pkg
489 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
490 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
495 ifeq ($(KBUILD_EXTMOD),)
496 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
498 ifneq ($(words $(MAKECMDGOALS)),1)
503 # install and module_install need also be processed one by one
504 ifneq ($(filter install,$(MAKECMDGOALS)),)
505 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
510 ifeq ($(mixed-targets),1)
511 # ===========================================================================
512 # We're called with mixed targets (*config and build targets).
513 # Handle them one by one.
515 PHONY += $(MAKECMDGOALS) __build_one_by_one
517 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
522 for i in $(MAKECMDGOALS); do \
523 $(MAKE) -f $(srctree)/Makefile $$i; \
527 ifeq ($(config-targets),1)
528 # ===========================================================================
529 # *config targets only - make sure prerequisites are updated, and descend
530 # in scripts/kconfig to make the *config target
532 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
533 # KBUILD_DEFCONFIG may point out an alternative default configuration
534 # used for 'make defconfig'
535 include arch/$(SRCARCH)/Makefile
536 export KBUILD_DEFCONFIG KBUILD_KCONFIG
538 config: scripts_basic outputmakefile FORCE
539 $(Q)$(MAKE) $(build)=scripts/kconfig $@
541 %config: scripts_basic outputmakefile FORCE
542 $(Q)$(MAKE) $(build)=scripts/kconfig $@
545 # ===========================================================================
546 # Build targets only - this includes vmlinux, arch specific targets, clean
547 # targets and others. In general all targets except *config targets.
549 ifeq ($(KBUILD_EXTMOD),)
550 # Additional helpers built in scripts/
551 # Carefully list dependencies so we do not try to build scripts twice
554 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
555 asm-generic gcc-plugins
556 $(Q)$(MAKE) $(build)=$(@)
558 # Objects we will link into vmlinux / subdirs we need to visit
560 drivers-y := drivers/ sound/ firmware/
565 endif # KBUILD_EXTMOD
567 ifeq ($(dot-config),1)
569 -include include/config/auto.conf
571 ifeq ($(KBUILD_EXTMOD),)
572 # Read in dependencies to all Kconfig* files, make sure to run
573 # oldconfig if changes are detected.
574 -include include/config/auto.conf.cmd
576 # To avoid any implicit rule to kick in, define an empty command
577 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
579 # If .config is newer than include/config/auto.conf, someone tinkered
580 # with it and forgot to run make oldconfig.
581 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
582 # we execute the config step to be sure to catch updated Kconfig files
583 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
584 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
586 # external modules needs include/generated/autoconf.h and include/config/auto.conf
587 # but do not care if they are up-to-date. Use auto.conf to trigger the test
588 PHONY += include/config/auto.conf
590 include/config/auto.conf:
591 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
593 echo >&2 " ERROR: Kernel configuration is invalid."; \
594 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
595 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
599 endif # KBUILD_EXTMOD
602 # Dummy target needed, because used as prerequisite
603 include/config/auto.conf: ;
604 endif # $(dot-config)
606 # The all: target is the default when no target is given on the
608 # This allow a user to issue only 'make' to build a kernel including modules
609 # Defaults to vmlinux, but the arch makefile usually adds further targets
612 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
613 # values of the respective KBUILD_* variables
617 include arch/$(SRCARCH)/Makefile
619 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
621 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
622 KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
624 ifdef CONFIG_PROFILE_ALL_BRANCHES
625 KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,)
631 # Tell gcc to never replace conditional load with a non-conditional one
632 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
635 gcc-plugins: scripts_basic
636 ifdef CONFIG_GCC_PLUGINS
637 $(Q)$(MAKE) $(build)=scripts/gcc-plugins
641 include scripts/Makefile.gcc-plugins
643 ifdef CONFIG_READABLE_ASM
644 # Disable optimizations that make assembler listings hard to read.
645 # reorder blocks reorders the control in the function
646 # ipa clone creates specialized cloned functions
647 # partial inlining inlines only parts of functions
648 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
649 $(call cc-option,-fno-ipa-cp-clone,) \
650 $(call cc-option,-fno-partial-inlining)
653 ifneq ($(CONFIG_FRAME_WARN),0)
654 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
657 # Handle stack protector mode.
659 # Since kbuild can potentially perform two passes (first with the old
660 # .config values and then with updated .config values), we cannot error out
661 # if a desired compiler option is unsupported. If we were to error, kbuild
662 # could never get to the second pass and actually notice that we changed
663 # the option to something that was supported.
665 # Additionally, we don't want to fallback and/or silently change which compiler
666 # flags will be used, since that leads to producing kernels with different
667 # security feature characteristics depending on the compiler used. ("But I
668 # selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
670 # The middle ground is to warn here so that the failed option is obvious, but
671 # to let the build fail with bad compiler flags so that we can't produce a
672 # kernel when there is a CONFIG and compiler mismatch.
674 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
675 stackp-flag := -fstack-protector
676 ifeq ($(call cc-option, $(stackp-flag)),)
677 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
678 -fstack-protector not supported by compiler)
681 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
682 stackp-flag := -fstack-protector-strong
683 ifeq ($(call cc-option, $(stackp-flag)),)
684 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
685 -fstack-protector-strong not supported by compiler)
688 # Force off for distro compilers that enable stack protector by default.
689 stackp-flag := $(call cc-option, -fno-stack-protector)
692 KBUILD_CFLAGS += $(stackp-flag)
694 ifeq ($(cc-name),clang)
695 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
696 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
697 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
698 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
699 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
700 # Quiet clang warning: comparison of unsigned expression < 0 is always false
701 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
702 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
703 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
704 # See modpost pattern 2
705 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
706 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
709 # These warnings generated too much noise in a regular build.
710 # Use make W=1 to enable them (see scripts/Makefile.build)
711 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
712 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
715 ifdef CONFIG_FRAME_POINTER
716 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
718 # Some targets (ARM with Thumb2, for example), can't be built with frame
719 # pointers. For those, we don't have FUNCTION_TRACER automatically
720 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
721 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
722 # -fomit-frame-pointer with FUNCTION_TRACER.
723 ifndef CONFIG_FUNCTION_TRACER
724 KBUILD_CFLAGS += -fomit-frame-pointer
728 KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
730 ifdef CONFIG_DEBUG_INFO
731 ifdef CONFIG_DEBUG_INFO_SPLIT
732 KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
736 KBUILD_AFLAGS += -Wa,-gdwarf-2
738 ifdef CONFIG_DEBUG_INFO_DWARF4
739 KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
742 ifdef CONFIG_DEBUG_INFO_REDUCED
743 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
744 $(call cc-option,-fno-var-tracking)
747 ifdef CONFIG_FUNCTION_TRACER
748 ifndef CC_FLAGS_FTRACE
749 CC_FLAGS_FTRACE := -pg
751 export CC_FLAGS_FTRACE
752 ifdef CONFIG_HAVE_FENTRY
753 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
755 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
756 KBUILD_AFLAGS += $(CC_USING_FENTRY)
757 ifdef CONFIG_DYNAMIC_FTRACE
758 ifdef CONFIG_HAVE_C_RECORDMCOUNT
759 BUILD_C_RECORDMCOUNT := y
760 export BUILD_C_RECORDMCOUNT
765 # We trigger additional mismatches with less inlining
766 ifdef CONFIG_DEBUG_SECTION_MISMATCH
767 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
770 # arch Makefile may override CC so keep this after arch Makefile is included
771 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
772 CHECKFLAGS += $(NOSTDINC_FLAGS)
774 # warn about C99 declaration after statement
775 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
777 # disable pointer signed / unsigned warnings in gcc 4.0
778 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
780 # disable invalid "can't wrap" optimizations for signed / pointers
781 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
783 # conserve stack if available
784 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
786 # disallow errors like 'EXPORT_GPL(foo);' with missing header
787 KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
789 # require functions to have arguments in prototypes, not empty 'int foo()'
790 KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
792 # Prohibit date/time macros, which would make the build non-deterministic
793 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
795 # enforce correct pointer usage
796 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
798 # use the deterministic mode of AR if available
799 KBUILD_ARFLAGS := $(call ar-option,D)
801 # check for 'asm goto'
802 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
803 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
804 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
807 include scripts/Makefile.kasan
808 include scripts/Makefile.extrawarn
809 include scripts/Makefile.ubsan
811 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
813 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
814 KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
815 KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
817 # Use --build-id when available.
818 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
819 $(call cc-ldoption, -Wl$(comma)--build-id,))
820 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
821 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
823 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
824 LDFLAGS_vmlinux += $(call ld-option, -X,)
827 # Default kernel image to build when no specific target is given.
828 # KBUILD_IMAGE may be overruled on the command line or
829 # set in the environment
830 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
832 export KBUILD_IMAGE ?= vmlinux
835 # INSTALL_PATH specifies where to place the updated kernel and system map
836 # images. Default is /boot, but you can set it to other values
837 export INSTALL_PATH ?= /boot
840 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
841 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
842 # an argument if needed. Otherwise it defaults to the kernel install path
844 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
847 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
848 # relocations required by build roots. This is not defined in the
849 # makefile but the argument can be passed to make if needed.
852 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
856 # INSTALL_MOD_STRIP, if defined, will cause modules to be
857 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
858 # the default option --strip-debug will be used. Otherwise,
859 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
861 ifdef INSTALL_MOD_STRIP
862 ifeq ($(INSTALL_MOD_STRIP),1)
863 mod_strip_cmd = $(STRIP) --strip-debug
865 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
866 endif # INSTALL_MOD_STRIP=1
869 endif # INSTALL_MOD_STRIP
872 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
873 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
874 # or CONFIG_MODULE_COMPRESS_XZ.
876 mod_compress_cmd = true
877 ifdef CONFIG_MODULE_COMPRESS
878 ifdef CONFIG_MODULE_COMPRESS_GZIP
879 mod_compress_cmd = gzip -n -f
880 endif # CONFIG_MODULE_COMPRESS_GZIP
881 ifdef CONFIG_MODULE_COMPRESS_XZ
882 mod_compress_cmd = xz -f
883 endif # CONFIG_MODULE_COMPRESS_XZ
884 endif # CONFIG_MODULE_COMPRESS
885 export mod_compress_cmd
887 # Select initial ramdisk compression format, default is gzip(1).
888 # This shall be used by the dracut(8) tool while creating an initramfs image.
890 INITRD_COMPRESS-y := gzip
891 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
892 INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
893 INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
894 INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
895 INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
896 # do not export INITRD_COMPRESS, since we didn't actually
897 # choose a sane default compression above.
898 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
900 ifdef CONFIG_MODULE_SIG_ALL
901 $(eval $(call config_filename,MODULE_SIG_KEY))
903 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
910 ifeq ($(KBUILD_EXTMOD),)
911 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
913 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
914 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
915 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
917 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
918 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
920 init-y := $(patsubst %/, %/built-in.o, $(init-y))
921 core-y := $(patsubst %/, %/built-in.o, $(core-y))
922 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
923 net-y := $(patsubst %/, %/built-in.o, $(net-y))
924 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
925 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
926 libs-y := $(libs-y1) $(libs-y2)
927 virt-y := $(patsubst %/, %/built-in.o, $(virt-y))
929 # Externally visible symbols (used by link-vmlinux.sh)
930 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
931 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
932 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
933 export LDFLAGS_vmlinux
934 # used by scripts/pacmage/Makefile
935 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
937 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
939 # Include targets which we want to execute sequentially if the rest of the
940 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
941 # evaluated more than once.
942 PHONY += vmlinux_prereq
943 vmlinux_prereq: $(vmlinux-deps) FORCE
944 ifdef CONFIG_HEADERS_CHECK
945 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
947 ifdef CONFIG_BUILD_DOCSRC
948 $(Q)$(MAKE) $(build)=Documentation
950 ifdef CONFIG_GDB_SCRIPTS
951 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
953 ifdef CONFIG_TRIM_UNUSED_KSYMS
954 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
955 "$(MAKE) KBUILD_MODULES=1 -f $(srctree)/Makefile vmlinux_prereq"
958 # standalone target for easier testing
959 include/generated/autoksyms.h: FORCE
960 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
962 # Final link of vmlinux
963 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
964 quiet_cmd_link-vmlinux = LINK $@
966 vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
967 +$(call if_changed,link-vmlinux)
969 # Build samples along the rest of the kernel
971 vmlinux-dirs += samples
974 # The actual objects are generated when descending,
975 # make sure no implicit rule kicks in
976 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
978 # Handle descending into subdirectories listed in $(vmlinux-dirs)
979 # Preset locale variables to speed up the build process. Limit locale
980 # tweaks to this spot to avoid wrong language settings when running
981 # make menuconfig etc.
982 # Error messages still appears in the original language
984 PHONY += $(vmlinux-dirs)
985 $(vmlinux-dirs): prepare scripts
986 $(Q)$(MAKE) $(build)=$@
988 define filechk_kernel.release
989 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
992 # Store (new) KERNELRELEASE string in include/config/kernel.release
993 include/config/kernel.release: include/config/auto.conf FORCE
994 $(call filechk,kernel.release)
997 # Things we need to do before we recursively start building the kernel
998 # or the modules are listed in "prepare".
999 # A multi level approach is used. prepareN is processed before prepareN-1.
1000 # archprepare is used in arch Makefiles and when processed asm symlink,
1001 # version.h and scripts_basic is processed / created.
1003 # Listed in dependency order
1004 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1006 # prepare3 is used to check if we are building in a separate output directory,
1008 # 1) Check that make has not been executed in the kernel src $(srctree)
1009 prepare3: include/config/kernel.release
1010 ifneq ($(KBUILD_SRC),)
1011 @$(kecho) ' Using $(srctree) as source for kernel'
1012 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1013 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1014 echo >&2 " in the '$(srctree)' directory.";\
1019 # prepare2 creates a makefile if using a separate output directory
1020 prepare2: prepare3 outputmakefile asm-generic
1022 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1023 include/config/auto.conf
1025 $(Q)test -e include/generated/autoksyms.h || \
1026 touch include/generated/autoksyms.h
1028 archprepare: archheaders archscripts prepare1 scripts_basic
1030 prepare0: archprepare gcc-plugins
1031 $(Q)$(MAKE) $(build)=.
1033 # All the preparing..
1034 prepare: prepare0 prepare-objtool
1036 ifdef CONFIG_STACK_VALIDATION
1037 has_libelf := $(call try-run,\
1038 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
1039 ifeq ($(has_libelf),1)
1040 objtool_target := tools/objtool FORCE
1042 $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev or elfutils-libelf-devel")
1043 SKIP_STACK_VALIDATION := 1
1044 export SKIP_STACK_VALIDATION
1048 PHONY += prepare-objtool
1049 prepare-objtool: $(objtool_target)
1051 # Generate some files
1052 # ---------------------------------------------------------------------------
1054 # KERNELRELEASE can change from a few different places, meaning version.h
1055 # needs to be updated, so this check is forced on all builds
1058 define filechk_utsrelease.h
1059 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1060 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1063 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1066 define filechk_version.h
1067 (echo \#define LINUX_VERSION_CODE $(shell \
1068 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1069 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1072 $(version_h): $(srctree)/Makefile FORCE
1073 $(call filechk,version.h)
1074 $(Q)rm -f $(old_version_h)
1076 include/generated/utsrelease.h: include/config/kernel.release FORCE
1077 $(call filechk,utsrelease.h)
1081 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1082 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1084 # ---------------------------------------------------------------------------
1086 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1087 export INSTALL_FW_PATH
1089 PHONY += firmware_install
1091 @mkdir -p $(objtree)/firmware
1092 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1094 # ---------------------------------------------------------------------------
1097 #Default location for installed headers
1098 export INSTALL_HDR_PATH = $(objtree)/usr
1100 # If we do an all arch process set dst to asm-$(hdr-arch)
1101 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1103 PHONY += archheaders
1106 PHONY += archscripts
1110 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts
1111 $(Q)$(MAKE) $(build)=scripts build_unifdef
1113 PHONY += headers_install_all
1114 headers_install_all:
1115 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1117 PHONY += headers_install
1118 headers_install: __headers
1119 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1120 $(error Headers not exportable for the $(SRCARCH) architecture))
1121 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1122 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1124 PHONY += headers_check_all
1125 headers_check_all: headers_install_all
1126 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1128 PHONY += headers_check
1129 headers_check: headers_install
1130 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1131 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1133 # ---------------------------------------------------------------------------
1138 $(Q)$(MAKE) -C tools/testing/selftests run_tests
1141 $(Q)$(MAKE) -C tools/testing/selftests clean
1143 PHONY += kselftest-merge
1145 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1146 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1147 -m $(objtree)/.config \
1148 $(srctree)/tools/testing/selftests/*/config
1149 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1151 # ---------------------------------------------------------------------------
1154 ifdef CONFIG_MODULES
1156 # By default, build modules as well
1162 # A module can be listed more than once in obj-m resulting in
1163 # duplicate lines in modules.order files. Those are removed
1164 # using awk while concatenating to the final file.
1167 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1168 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1169 @$(kecho) ' Building modules, stage 2.';
1170 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1171 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1173 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1174 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1176 %/modules.builtin: include/config/auto.conf
1177 $(Q)$(MAKE) $(modbuiltin)=$*
1180 # Target to prepare building external modules
1181 PHONY += modules_prepare
1182 modules_prepare: prepare scripts
1184 # Target to install modules
1185 PHONY += modules_install
1186 modules_install: _modinst_ _modinst_post
1190 @rm -rf $(MODLIB)/kernel
1191 @rm -f $(MODLIB)/source
1192 @mkdir -p $(MODLIB)/kernel
1193 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1194 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1195 rm -f $(MODLIB)/build ; \
1196 ln -s $(CURDIR) $(MODLIB)/build ; \
1198 @cp -f $(objtree)/modules.order $(MODLIB)/
1199 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1200 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1202 # This depmod is only for convenience to give the initial
1203 # boot a modules.dep even before / is mounted read-write. However the
1204 # boot script depmod is the master version.
1205 PHONY += _modinst_post
1206 _modinst_post: _modinst_
1207 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1210 ifeq ($(CONFIG_MODULE_SIG), y)
1211 PHONY += modules_sign
1213 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1216 else # CONFIG_MODULES
1218 # Modules not configured
1219 # ---------------------------------------------------------------------------
1221 PHONY += modules modules_install
1222 modules modules_install:
1224 @echo >&2 "The present kernel configuration has modules disabled."
1225 @echo >&2 "Type 'make config' and enable loadable module support."
1226 @echo >&2 "Then build a kernel with module support enabled."
1230 endif # CONFIG_MODULES
1233 # Cleaning is done on three levels.
1234 # make clean Delete most generated files
1235 # Leave enough to build external modules
1236 # make mrproper Delete the current configuration, and all generated files
1237 # make distclean Remove editor backup files, patch leftover files and the like
1239 # Directories & files removed with 'make clean'
1240 CLEAN_DIRS += $(MODVERDIR)
1242 # Directories & files removed with 'make mrproper'
1243 MRPROPER_DIRS += include/config usr/include include/generated \
1244 arch/*/include/generated .tmp_objdiff
1245 MRPROPER_FILES += .config .config.old .version .old_version \
1246 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1247 signing_key.pem signing_key.priv signing_key.x509 \
1248 x509.genkey extra_certificates signing_key.x509.keyid \
1249 signing_key.x509.signer vmlinux-gdb.py
1251 # clean - Delete most, but leave enough to build external modules
1253 clean: rm-dirs := $(CLEAN_DIRS)
1254 clean: rm-files := $(CLEAN_FILES)
1255 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1257 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1259 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1262 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1264 clean: archclean vmlinuxclean
1266 # mrproper - Delete all generated files, including .config
1268 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1269 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1270 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1272 PHONY += $(mrproper-dirs) mrproper archmrproper
1274 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1276 mrproper: clean archmrproper $(mrproper-dirs)
1285 @find $(srctree) $(RCS_FIND_IGNORE) \
1286 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1287 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1288 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
1289 -type f -print | xargs rm -f
1292 # Packaging of the kernel to various formats
1293 # ---------------------------------------------------------------------------
1294 # rpm target kept for backward compatibility
1295 package-dir := scripts/package
1298 $(Q)$(MAKE) $(build)=$(package-dir) $@
1299 %pkg: include/config/kernel.release FORCE
1300 $(Q)$(MAKE) $(build)=$(package-dir) $@
1301 rpm: include/config/kernel.release FORCE
1302 $(Q)$(MAKE) $(build)=$(package-dir) $@
1305 # Brief documentation of the typical targets used
1306 # ---------------------------------------------------------------------------
1308 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1309 boards := $(sort $(notdir $(boards)))
1310 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1311 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1315 @echo 'Cleaning targets:'
1316 @echo ' clean - Remove most generated files but keep the config and'
1317 @echo ' enough build support to build external modules'
1318 @echo ' mrproper - Remove all generated files + config + various backup files'
1319 @echo ' distclean - mrproper + remove editor backup and patch files'
1321 @echo 'Configuration targets:'
1322 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1324 @echo 'Other generic targets:'
1325 @echo ' all - Build all targets marked with [*]'
1326 @echo '* vmlinux - Build the bare kernel'
1327 @echo '* modules - Build all modules'
1328 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1329 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1330 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1331 @echo ' dir/ - Build all files in dir and below'
1332 @echo ' dir/file.[ois] - Build specified target only'
1333 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1334 @echo ' (requires a recent binutils and recent build (System.map))'
1335 @echo ' dir/file.ko - Build module including final link'
1336 @echo ' modules_prepare - Set up for building external modules'
1337 @echo ' tags/TAGS - Generate tags file for editors'
1338 @echo ' cscope - Generate cscope index'
1339 @echo ' gtags - Generate GNU GLOBAL index'
1340 @echo ' kernelrelease - Output the release version string (use with make -s)'
1341 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1342 @echo ' image_name - Output the image name (use with make -s)'
1343 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1344 echo ' (default: $(INSTALL_HDR_PATH))'; \
1346 @echo 'Static analysers'
1347 @echo ' checkstack - Generate a list of stack hogs'
1348 @echo ' namespacecheck - Name space analysis on compiled kernel'
1349 @echo ' versioncheck - Sanity check on version.h usage'
1350 @echo ' includecheck - Check for duplicate included header files'
1351 @echo ' export_report - List the usages of all exported symbols'
1352 @echo ' headers_check - Sanity check on exported headers'
1353 @echo ' headerdep - Detect inclusion cycles in headers'
1354 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1356 @echo 'Kernel selftest'
1357 @echo ' kselftest - Build and run kernel selftest (run as root)'
1358 @echo ' Build, install, and boot kernel before'
1359 @echo ' running kselftest on it'
1360 @echo ' kselftest-clean - Remove all generated kselftest files'
1361 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existed'
1364 @echo 'Kernel packaging:'
1365 @$(MAKE) $(build)=$(package-dir) help
1367 @echo 'Documentation targets:'
1368 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1370 @echo 'Architecture specific targets ($(SRCARCH)):'
1371 @$(if $(archhelp),$(archhelp),\
1372 echo ' No architecture specific help defined for $(SRCARCH)')
1375 $(foreach b, $(boards), \
1376 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1378 @$(if $(board-dirs), \
1379 $(foreach b, $(board-dirs), \
1380 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1381 printf " %-16s - Show all of the above\\n" help-boards; \
1384 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1385 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1386 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1387 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1388 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1389 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1390 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1391 @echo ' 1: warnings which may be relevant and do not occur too often'
1392 @echo ' 2: warnings which occur quite often but may still be relevant'
1393 @echo ' 3: more obscure warnings, can most likely be ignored'
1394 @echo ' Multiple levels can be combined with W=12 or W=123'
1396 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1397 @echo 'For further info see the ./README file'
1400 help-board-dirs := $(addprefix help-,$(board-dirs))
1402 help-boards: $(help-board-dirs)
1404 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1406 $(help-board-dirs): help-%:
1407 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1408 @$(if $(boards-per-dir), \
1409 $(foreach b, $(boards-per-dir), \
1410 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1414 # Documentation targets
1415 # ---------------------------------------------------------------------------
1416 %docs: scripts_basic FORCE
1417 $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1418 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1420 else # KBUILD_EXTMOD
1423 # External module support.
1424 # When building external modules the kernel used as basis is considered
1425 # read-only, and no consistency checks are made and the make
1426 # system is not used on the basis kernel. If updates are required
1427 # in the basis kernel ordinary make commands (without M=...) must
1430 # The following are the only valid targets when building external
1432 # make M=dir clean Delete all automatically generated files
1433 # make M=dir modules Make all modules in specified dir
1434 # make M=dir Same as 'make M=dir modules'
1435 # make M=dir modules_install
1436 # Install the modules built in the module directory
1437 # Assumes install directory is already created
1439 # We are always building modules
1441 PHONY += crmodverdir
1445 PHONY += $(objtree)/Module.symvers
1446 $(objtree)/Module.symvers:
1447 @test -e $(objtree)/Module.symvers || ( \
1449 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1450 echo " is missing; modules will have no dependencies and modversions."; \
1453 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1454 PHONY += $(module-dirs) modules
1455 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1456 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1458 modules: $(module-dirs)
1459 @$(kecho) ' Building modules, stage 2.';
1460 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1462 PHONY += modules_install
1463 modules_install: _emodinst_ _emodinst_post
1465 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1468 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1469 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1471 PHONY += _emodinst_post
1472 _emodinst_post: _emodinst_
1475 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1477 PHONY += $(clean-dirs) clean
1479 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1481 clean: rm-dirs := $(MODVERDIR)
1482 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1486 @echo ' Building external modules.'
1487 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1489 @echo ' modules - default target, build the module(s)'
1490 @echo ' modules_install - install the module'
1491 @echo ' clean - remove generated files in module directory only'
1495 PHONY += prepare scripts
1498 endif # KBUILD_EXTMOD
1500 clean: $(clean-dirs)
1503 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1504 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1508 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1509 -o -name '*.symtypes' -o -name 'modules.order' \
1510 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1511 -o -name '*.c.[012]*.*' \
1512 -o -name '*.gcno' \) -type f -print | xargs rm -f
1514 # Generate tags for editors
1515 # ---------------------------------------------------------------------------
1516 quiet_cmd_tags = GEN $@
1517 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1519 tags TAGS cscope gtags: FORCE
1522 # Scripts to check various things for consistency
1523 # ---------------------------------------------------------------------------
1525 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1528 find $(srctree)/* $(RCS_FIND_IGNORE) \
1529 -name '*.[hcS]' -type f -print | sort \
1530 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1533 find $(srctree)/* $(RCS_FIND_IGNORE) \
1534 -name '*.[hcS]' -type f -print | sort \
1535 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1538 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1541 $(PERL) $(srctree)/scripts/namespace.pl
1544 $(PERL) $(srctree)/scripts/export_report.pl
1546 endif #ifeq ($(config-targets),1)
1547 endif #ifeq ($(mixed-targets),1)
1549 PHONY += checkstack kernelrelease kernelversion image_name
1551 # UML needs a little special treatment here. It wants to use the host
1552 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1553 # else wants $(ARCH), including people doing cross-builds, which means
1554 # that $(SUBARCH) doesn't work here.
1556 CHECKSTACK_ARCH := $(SUBARCH)
1558 CHECKSTACK_ARCH := $(ARCH)
1561 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1562 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1565 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1568 @echo $(KERNELVERSION)
1571 @echo $(KBUILD_IMAGE)
1573 # Clear a bunch of variables before executing the submake
1575 $(Q)mkdir -p $(objtree)/tools
1576 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1579 $(Q)mkdir -p $(objtree)/tools
1580 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1583 # ---------------------------------------------------------------------------
1584 # Single targets are compatible with:
1585 # - build with mixed source and output
1586 # - build with separate output dir 'make O=...'
1587 # - external modules
1589 # target-dir => where to store outputfile
1590 # build-dir => directory in kernel source tree to use
1592 ifeq ($(KBUILD_EXTMOD),)
1593 build-dir = $(patsubst %/,%,$(dir $@))
1594 target-dir = $(dir $@)
1596 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1597 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1598 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1601 %.s: %.c prepare scripts FORCE
1602 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1603 %.i: %.c prepare scripts FORCE
1604 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1605 %.o: %.c prepare scripts FORCE
1606 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1607 %.lst: %.c prepare scripts FORCE
1608 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1609 %.s: %.S prepare scripts FORCE
1610 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1611 %.o: %.S prepare scripts FORCE
1612 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1613 %.symtypes: %.c prepare scripts FORCE
1614 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1617 /: prepare scripts FORCE
1619 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1620 $(build)=$(build-dir)
1621 # Make sure the latest headers are built for Documentation
1622 Documentation/: headers_install
1623 %/: prepare scripts FORCE
1625 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1626 $(build)=$(build-dir)
1627 %.ko: prepare scripts FORCE
1629 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1630 $(build)=$(build-dir) $(@:.ko=.o)
1631 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1633 # FIXME Should go into a make.lib or something
1634 # ===========================================================================
1636 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1637 cmd_rmdirs = rm -rf $(rm-dirs)
1639 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1640 cmd_rmfiles = rm -f $(rm-files)
1642 # Run depmod only if we have System.map and depmod is executable
1643 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1644 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1645 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1647 # Create temporary dir for module support files
1648 # clean it up only when building all modules
1649 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1650 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1652 # read all saved command lines
1654 targets := $(wildcard $(sort $(targets)))
1655 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1657 ifneq ($(cmd_files),)
1658 $(cmd_files): ; # Do not try to update included dependency files
1659 include $(cmd_files)
1662 endif # skip-makefile
1667 # Declare the contents of the .PHONY variable as phony. We keep that
1668 # information in a variable so we can use it in if_changed and friends.