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 $(CF)
373 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage -fno-tree-loop-im -Wno-maybe-uninitialized
374 CFLAGS_KCOV = -fsanitize-coverage=trace-pc
377 # Use USERINCLUDE when you must reference the UAPI directories only.
379 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
380 -Iarch/$(hdr-arch)/include/generated/uapi \
381 -I$(srctree)/include/uapi \
382 -Iinclude/generated/uapi \
383 -include $(srctree)/include/linux/kconfig.h
385 # Use LINUXINCLUDE when you must reference the include/ directory.
386 # Needed to be compatible with the O= option
388 -I$(srctree)/arch/$(hdr-arch)/include \
389 -Iarch/$(hdr-arch)/include/generated/uapi \
390 -Iarch/$(hdr-arch)/include/generated \
391 $(if $(KBUILD_SRC), -I$(srctree)/include) \
395 KBUILD_CPPFLAGS := -D__KERNEL__
397 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
398 -fno-strict-aliasing -fno-common \
399 -Werror-implicit-function-declaration \
400 -Wno-format-security \
403 KBUILD_AFLAGS_KERNEL :=
404 KBUILD_CFLAGS_KERNEL :=
405 KBUILD_AFLAGS := -D__ASSEMBLY__
406 KBUILD_AFLAGS_MODULE := -DMODULE
407 KBUILD_CFLAGS_MODULE := -DMODULE
408 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
410 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
411 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
412 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
414 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
415 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
416 export CPP AR NM STRIP OBJCOPY OBJDUMP
417 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
418 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
420 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
421 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
422 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
423 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
424 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
425 export KBUILD_ARFLAGS
427 # When compiling out-of-tree modules, put MODVERDIR in the module
428 # tree rather than in the kernel tree. The kernel tree might
430 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
432 # Files to ignore in find ... statements
434 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
435 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
437 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
438 --exclude CVS --exclude .pc --exclude .hg --exclude .git
440 # ===========================================================================
441 # Rules shared between *config targets and build targets
443 # Basic helpers built in scripts/
444 PHONY += scripts_basic
446 $(Q)$(MAKE) $(build)=scripts/basic
447 $(Q)rm -f .tmp_quiet_recordmcount
449 # To avoid any implicit rule to kick in, define an empty command.
450 scripts/basic/%: scripts_basic ;
452 PHONY += outputmakefile
453 # outputmakefile generates a Makefile in the output directory, if using a
454 # separate output directory. This allows convenient use of make in the
457 ifneq ($(KBUILD_SRC),)
458 $(Q)ln -fsn $(srctree) source
459 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
460 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
463 # Support for using generic headers in asm-generic
466 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
467 src=asm obj=arch/$(SRCARCH)/include/generated/asm
468 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
469 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
471 # To make sure we do not include .config for any of the *config targets
472 # catch them early, and hand them over to scripts/kconfig/Makefile
473 # It is allowed to specify more targets when calling make, including
474 # mixing *config targets and build targets.
475 # For example 'make oldconfig all'.
476 # Detect when mixed targets is specified, and make a second invocation
477 # of make so .config is not included in this case either (for *config).
479 version_h := include/generated/uapi/linux/version.h
480 old_version_h := include/linux/version.h
482 no-dot-config-targets := clean mrproper distclean \
483 cscope gtags TAGS tags help% %docs check% coccicheck \
484 $(version_h) headers_% archheaders archscripts \
485 kernelversion %src-pkg
491 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
492 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
497 ifeq ($(KBUILD_EXTMOD),)
498 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
500 ifneq ($(words $(MAKECMDGOALS)),1)
505 # install and module_install need also be processed one by one
506 ifneq ($(filter install,$(MAKECMDGOALS)),)
507 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
512 ifeq ($(mixed-targets),1)
513 # ===========================================================================
514 # We're called with mixed targets (*config and build targets).
515 # Handle them one by one.
517 PHONY += $(MAKECMDGOALS) __build_one_by_one
519 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
524 for i in $(MAKECMDGOALS); do \
525 $(MAKE) -f $(srctree)/Makefile $$i; \
529 ifeq ($(config-targets),1)
530 # ===========================================================================
531 # *config targets only - make sure prerequisites are updated, and descend
532 # in scripts/kconfig to make the *config target
534 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
535 # KBUILD_DEFCONFIG may point out an alternative default configuration
536 # used for 'make defconfig'
537 include arch/$(SRCARCH)/Makefile
538 export KBUILD_DEFCONFIG KBUILD_KCONFIG
540 config: scripts_basic outputmakefile FORCE
541 $(Q)$(MAKE) $(build)=scripts/kconfig $@
543 %config: scripts_basic outputmakefile FORCE
544 $(Q)$(MAKE) $(build)=scripts/kconfig $@
547 # ===========================================================================
548 # Build targets only - this includes vmlinux, arch specific targets, clean
549 # targets and others. In general all targets except *config targets.
551 ifeq ($(KBUILD_EXTMOD),)
552 # Additional helpers built in scripts/
553 # Carefully list dependencies so we do not try to build scripts twice
556 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
558 $(Q)$(MAKE) $(build)=$(@)
560 # Objects we will link into vmlinux / subdirs we need to visit
562 drivers-y := drivers/ sound/ firmware/
567 endif # KBUILD_EXTMOD
569 ifeq ($(dot-config),1)
571 -include include/config/auto.conf
573 ifeq ($(KBUILD_EXTMOD),)
574 # Read in dependencies to all Kconfig* files, make sure to run
575 # oldconfig if changes are detected.
576 -include include/config/auto.conf.cmd
578 # To avoid any implicit rule to kick in, define an empty command
579 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
581 # If .config is newer than include/config/auto.conf, someone tinkered
582 # with it and forgot to run make oldconfig.
583 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
584 # we execute the config step to be sure to catch updated Kconfig files
585 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
586 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
588 # external modules needs include/generated/autoconf.h and include/config/auto.conf
589 # but do not care if they are up-to-date. Use auto.conf to trigger the test
590 PHONY += include/config/auto.conf
592 include/config/auto.conf:
593 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
595 echo >&2 " ERROR: Kernel configuration is invalid."; \
596 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
597 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
601 endif # KBUILD_EXTMOD
604 # Dummy target needed, because used as prerequisite
605 include/config/auto.conf: ;
606 endif # $(dot-config)
608 # The all: target is the default when no target is given on the
610 # This allow a user to issue only 'make' to build a kernel including modules
611 # Defaults to vmlinux, but the arch makefile usually adds further targets
614 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
615 # values of the respective KBUILD_* variables
619 include arch/$(SRCARCH)/Makefile
621 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
623 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
624 KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
626 ifdef CONFIG_PROFILE_ALL_BRANCHES
627 KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,)
633 # Tell gcc to never replace conditional load with a non-conditional one
634 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
636 ifdef CONFIG_READABLE_ASM
637 # Disable optimizations that make assembler listings hard to read.
638 # reorder blocks reorders the control in the function
639 # ipa clone creates specialized cloned functions
640 # partial inlining inlines only parts of functions
641 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
642 $(call cc-option,-fno-ipa-cp-clone,) \
643 $(call cc-option,-fno-partial-inlining)
646 ifneq ($(CONFIG_FRAME_WARN),0)
647 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
650 # Handle stack protector mode.
652 # Since kbuild can potentially perform two passes (first with the old
653 # .config values and then with updated .config values), we cannot error out
654 # if a desired compiler option is unsupported. If we were to error, kbuild
655 # could never get to the second pass and actually notice that we changed
656 # the option to something that was supported.
658 # Additionally, we don't want to fallback and/or silently change which compiler
659 # flags will be used, since that leads to producing kernels with different
660 # security feature characteristics depending on the compiler used. ("But I
661 # selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
663 # The middle ground is to warn here so that the failed option is obvious, but
664 # to let the build fail with bad compiler flags so that we can't produce a
665 # kernel when there is a CONFIG and compiler mismatch.
667 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
668 stackp-flag := -fstack-protector
669 ifeq ($(call cc-option, $(stackp-flag)),)
670 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
671 -fstack-protector not supported by compiler)
674 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
675 stackp-flag := -fstack-protector-strong
676 ifeq ($(call cc-option, $(stackp-flag)),)
677 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
678 -fstack-protector-strong not supported by compiler)
681 # Force off for distro compilers that enable stack protector by default.
682 stackp-flag := $(call cc-option, -fno-stack-protector)
685 KBUILD_CFLAGS += $(stackp-flag)
688 ifeq ($(call cc-option, $(CFLAGS_KCOV)),)
689 $(warning Cannot use CONFIG_KCOV: \
690 -fsanitize-coverage=trace-pc is not supported by compiler)
695 ifeq ($(cc-name),clang)
696 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
697 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
698 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
699 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
700 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
701 # Quiet clang warning: comparison of unsigned expression < 0 is always false
702 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
703 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
704 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
705 # See modpost pattern 2
706 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
707 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
710 # These warnings generated too much noise in a regular build.
711 # Use make W=1 to enable them (see scripts/Makefile.build)
712 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
713 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
716 ifdef CONFIG_FRAME_POINTER
717 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
719 # Some targets (ARM with Thumb2, for example), can't be built with frame
720 # pointers. For those, we don't have FUNCTION_TRACER automatically
721 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
722 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
723 # -fomit-frame-pointer with FUNCTION_TRACER.
724 ifndef CONFIG_FUNCTION_TRACER
725 KBUILD_CFLAGS += -fomit-frame-pointer
729 KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
731 ifdef CONFIG_DEBUG_INFO
732 ifdef CONFIG_DEBUG_INFO_SPLIT
733 KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
737 KBUILD_AFLAGS += -Wa,-gdwarf-2
739 ifdef CONFIG_DEBUG_INFO_DWARF4
740 KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
743 ifdef CONFIG_DEBUG_INFO_REDUCED
744 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
745 $(call cc-option,-fno-var-tracking)
748 ifdef CONFIG_FUNCTION_TRACER
749 ifndef CC_FLAGS_FTRACE
750 CC_FLAGS_FTRACE := -pg
752 export CC_FLAGS_FTRACE
753 ifdef CONFIG_HAVE_FENTRY
754 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
756 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
757 KBUILD_AFLAGS += $(CC_USING_FENTRY)
758 ifdef CONFIG_DYNAMIC_FTRACE
759 ifdef CONFIG_HAVE_C_RECORDMCOUNT
760 BUILD_C_RECORDMCOUNT := y
761 export BUILD_C_RECORDMCOUNT
766 # We trigger additional mismatches with less inlining
767 ifdef CONFIG_DEBUG_SECTION_MISMATCH
768 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
771 # arch Makefile may override CC so keep this after arch Makefile is included
772 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
773 CHECKFLAGS += $(NOSTDINC_FLAGS)
775 # warn about C99 declaration after statement
776 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
778 # disable pointer signed / unsigned warnings in gcc 4.0
779 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
781 # disable invalid "can't wrap" optimizations for signed / pointers
782 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
784 # conserve stack if available
785 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
787 # disallow errors like 'EXPORT_GPL(foo);' with missing header
788 KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
790 # require functions to have arguments in prototypes, not empty 'int foo()'
791 KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
793 # Prohibit date/time macros, which would make the build non-deterministic
794 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
796 # enforce correct pointer usage
797 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
799 # use the deterministic mode of AR if available
800 KBUILD_ARFLAGS := $(call ar-option,D)
802 # check for 'asm goto'
803 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
804 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
805 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
808 include scripts/Makefile.kasan
809 include scripts/Makefile.extrawarn
810 include scripts/Makefile.ubsan
812 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
814 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
815 KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
816 KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
818 # Use --build-id when available.
819 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
820 $(call cc-ldoption, -Wl$(comma)--build-id,))
821 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
822 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
824 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
825 LDFLAGS_vmlinux += $(call ld-option, -X,)
828 # Default kernel image to build when no specific target is given.
829 # KBUILD_IMAGE may be overruled on the command line or
830 # set in the environment
831 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
833 export KBUILD_IMAGE ?= vmlinux
836 # INSTALL_PATH specifies where to place the updated kernel and system map
837 # images. Default is /boot, but you can set it to other values
838 export INSTALL_PATH ?= /boot
841 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
842 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
843 # an argument if needed. Otherwise it defaults to the kernel install path
845 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
848 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
849 # relocations required by build roots. This is not defined in the
850 # makefile but the argument can be passed to make if needed.
853 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
857 # INSTALL_MOD_STRIP, if defined, will cause modules to be
858 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
859 # the default option --strip-debug will be used. Otherwise,
860 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
862 ifdef INSTALL_MOD_STRIP
863 ifeq ($(INSTALL_MOD_STRIP),1)
864 mod_strip_cmd = $(STRIP) --strip-debug
866 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
867 endif # INSTALL_MOD_STRIP=1
870 endif # INSTALL_MOD_STRIP
873 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
874 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
875 # or CONFIG_MODULE_COMPRESS_XZ.
877 mod_compress_cmd = true
878 ifdef CONFIG_MODULE_COMPRESS
879 ifdef CONFIG_MODULE_COMPRESS_GZIP
880 mod_compress_cmd = gzip -n -f
881 endif # CONFIG_MODULE_COMPRESS_GZIP
882 ifdef CONFIG_MODULE_COMPRESS_XZ
883 mod_compress_cmd = xz -f
884 endif # CONFIG_MODULE_COMPRESS_XZ
885 endif # CONFIG_MODULE_COMPRESS
886 export mod_compress_cmd
888 # Select initial ramdisk compression format, default is gzip(1).
889 # This shall be used by the dracut(8) tool while creating an initramfs image.
891 INITRD_COMPRESS-y := gzip
892 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
893 INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
894 INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
895 INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
896 INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
897 # do not export INITRD_COMPRESS, since we didn't actually
898 # choose a sane default compression above.
899 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
901 ifdef CONFIG_MODULE_SIG_ALL
902 $(eval $(call config_filename,MODULE_SIG_KEY))
904 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
911 ifeq ($(KBUILD_EXTMOD),)
912 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
914 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
915 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
916 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
918 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
919 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
921 init-y := $(patsubst %/, %/built-in.o, $(init-y))
922 core-y := $(patsubst %/, %/built-in.o, $(core-y))
923 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
924 net-y := $(patsubst %/, %/built-in.o, $(net-y))
925 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
926 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
927 libs-y := $(libs-y1) $(libs-y2)
928 virt-y := $(patsubst %/, %/built-in.o, $(virt-y))
930 # Externally visible symbols (used by link-vmlinux.sh)
931 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
932 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
933 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
934 export LDFLAGS_vmlinux
935 # used by scripts/pacmage/Makefile
936 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
938 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
940 # Include targets which we want to execute sequentially if the rest of the
941 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
942 # evaluated more than once.
943 PHONY += vmlinux_prereq
944 vmlinux_prereq: $(vmlinux-deps) FORCE
945 ifdef CONFIG_HEADERS_CHECK
946 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
948 ifdef CONFIG_BUILD_DOCSRC
949 $(Q)$(MAKE) $(build)=Documentation
951 ifdef CONFIG_GDB_SCRIPTS
952 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
954 ifdef CONFIG_TRIM_UNUSED_KSYMS
955 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
956 "$(MAKE) KBUILD_MODULES=1 -f $(srctree)/Makefile vmlinux_prereq"
959 # standalone target for easier testing
960 include/generated/autoksyms.h: FORCE
961 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
963 # Final link of vmlinux
964 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
965 quiet_cmd_link-vmlinux = LINK $@
967 vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
968 +$(call if_changed,link-vmlinux)
970 # Build samples along the rest of the kernel
972 vmlinux-dirs += samples
975 # The actual objects are generated when descending,
976 # make sure no implicit rule kicks in
977 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
979 # Handle descending into subdirectories listed in $(vmlinux-dirs)
980 # Preset locale variables to speed up the build process. Limit locale
981 # tweaks to this spot to avoid wrong language settings when running
982 # make menuconfig etc.
983 # Error messages still appears in the original language
985 PHONY += $(vmlinux-dirs)
986 $(vmlinux-dirs): prepare scripts
987 $(Q)$(MAKE) $(build)=$@
989 define filechk_kernel.release
990 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
993 # Store (new) KERNELRELEASE string in include/config/kernel.release
994 include/config/kernel.release: include/config/auto.conf FORCE
995 $(call filechk,kernel.release)
998 # Things we need to do before we recursively start building the kernel
999 # or the modules are listed in "prepare".
1000 # A multi level approach is used. prepareN is processed before prepareN-1.
1001 # archprepare is used in arch Makefiles and when processed asm symlink,
1002 # version.h and scripts_basic is processed / created.
1004 # Listed in dependency order
1005 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1007 # prepare3 is used to check if we are building in a separate output directory,
1009 # 1) Check that make has not been executed in the kernel src $(srctree)
1010 prepare3: include/config/kernel.release
1011 ifneq ($(KBUILD_SRC),)
1012 @$(kecho) ' Using $(srctree) as source for kernel'
1013 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1014 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1015 echo >&2 " in the '$(srctree)' directory.";\
1020 # prepare2 creates a makefile if using a separate output directory
1021 prepare2: prepare3 outputmakefile asm-generic
1023 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1024 include/config/auto.conf
1026 $(Q)test -e include/generated/autoksyms.h || \
1027 touch include/generated/autoksyms.h
1029 archprepare: archheaders archscripts prepare1 scripts_basic
1031 prepare0: archprepare
1032 $(Q)$(MAKE) $(build)=.
1034 # All the preparing..
1035 prepare: prepare0 prepare-objtool
1037 ifdef CONFIG_STACK_VALIDATION
1038 has_libelf := $(call try-run,\
1039 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
1040 ifeq ($(has_libelf),1)
1041 objtool_target := tools/objtool FORCE
1043 $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev or elfutils-libelf-devel")
1044 SKIP_STACK_VALIDATION := 1
1045 export SKIP_STACK_VALIDATION
1049 PHONY += prepare-objtool
1050 prepare-objtool: $(objtool_target)
1052 # Generate some files
1053 # ---------------------------------------------------------------------------
1055 # KERNELRELEASE can change from a few different places, meaning version.h
1056 # needs to be updated, so this check is forced on all builds
1059 define filechk_utsrelease.h
1060 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1061 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1064 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1067 define filechk_version.h
1068 (echo \#define LINUX_VERSION_CODE $(shell \
1069 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1070 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1073 $(version_h): $(srctree)/Makefile FORCE
1074 $(call filechk,version.h)
1075 $(Q)rm -f $(old_version_h)
1077 include/generated/utsrelease.h: include/config/kernel.release FORCE
1078 $(call filechk,utsrelease.h)
1082 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1083 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1085 # ---------------------------------------------------------------------------
1087 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1088 export INSTALL_FW_PATH
1090 PHONY += firmware_install
1092 @mkdir -p $(objtree)/firmware
1093 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1095 # ---------------------------------------------------------------------------
1098 #Default location for installed headers
1099 export INSTALL_HDR_PATH = $(objtree)/usr
1101 # If we do an all arch process set dst to asm-$(hdr-arch)
1102 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1104 PHONY += archheaders
1107 PHONY += archscripts
1111 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts
1112 $(Q)$(MAKE) $(build)=scripts build_unifdef
1114 PHONY += headers_install_all
1115 headers_install_all:
1116 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1118 PHONY += headers_install
1119 headers_install: __headers
1120 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1121 $(error Headers not exportable for the $(SRCARCH) architecture))
1122 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1123 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1125 PHONY += headers_check_all
1126 headers_check_all: headers_install_all
1127 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1129 PHONY += headers_check
1130 headers_check: headers_install
1131 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1132 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1134 # ---------------------------------------------------------------------------
1139 $(Q)$(MAKE) -C tools/testing/selftests run_tests
1142 $(Q)$(MAKE) -C tools/testing/selftests clean
1144 PHONY += kselftest-merge
1146 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1147 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1148 -m $(objtree)/.config \
1149 $(srctree)/tools/testing/selftests/*/config
1150 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1152 # ---------------------------------------------------------------------------
1155 ifdef CONFIG_MODULES
1157 # By default, build modules as well
1163 # A module can be listed more than once in obj-m resulting in
1164 # duplicate lines in modules.order files. Those are removed
1165 # using awk while concatenating to the final file.
1168 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1169 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1170 @$(kecho) ' Building modules, stage 2.';
1171 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1172 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1174 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1175 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1177 %/modules.builtin: include/config/auto.conf
1178 $(Q)$(MAKE) $(modbuiltin)=$*
1181 # Target to prepare building external modules
1182 PHONY += modules_prepare
1183 modules_prepare: prepare scripts
1185 # Target to install modules
1186 PHONY += modules_install
1187 modules_install: _modinst_ _modinst_post
1191 @rm -rf $(MODLIB)/kernel
1192 @rm -f $(MODLIB)/source
1193 @mkdir -p $(MODLIB)/kernel
1194 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1195 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1196 rm -f $(MODLIB)/build ; \
1197 ln -s $(CURDIR) $(MODLIB)/build ; \
1199 @cp -f $(objtree)/modules.order $(MODLIB)/
1200 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1201 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1203 # This depmod is only for convenience to give the initial
1204 # boot a modules.dep even before / is mounted read-write. However the
1205 # boot script depmod is the master version.
1206 PHONY += _modinst_post
1207 _modinst_post: _modinst_
1208 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1211 ifeq ($(CONFIG_MODULE_SIG), y)
1212 PHONY += modules_sign
1214 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1217 else # CONFIG_MODULES
1219 # Modules not configured
1220 # ---------------------------------------------------------------------------
1222 PHONY += modules modules_install
1223 modules modules_install:
1225 @echo >&2 "The present kernel configuration has modules disabled."
1226 @echo >&2 "Type 'make config' and enable loadable module support."
1227 @echo >&2 "Then build a kernel with module support enabled."
1231 endif # CONFIG_MODULES
1234 # Cleaning is done on three levels.
1235 # make clean Delete most generated files
1236 # Leave enough to build external modules
1237 # make mrproper Delete the current configuration, and all generated files
1238 # make distclean Remove editor backup files, patch leftover files and the like
1240 # Directories & files removed with 'make clean'
1241 CLEAN_DIRS += $(MODVERDIR)
1243 # Directories & files removed with 'make mrproper'
1244 MRPROPER_DIRS += include/config usr/include include/generated \
1245 arch/*/include/generated .tmp_objdiff
1246 MRPROPER_FILES += .config .config.old .version .old_version \
1247 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1248 signing_key.pem signing_key.priv signing_key.x509 \
1249 x509.genkey extra_certificates signing_key.x509.keyid \
1250 signing_key.x509.signer vmlinux-gdb.py
1252 # clean - Delete most, but leave enough to build external modules
1254 clean: rm-dirs := $(CLEAN_DIRS)
1255 clean: rm-files := $(CLEAN_FILES)
1256 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1258 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1260 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1263 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1265 clean: archclean vmlinuxclean
1267 # mrproper - Delete all generated files, including .config
1269 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1270 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1271 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1273 PHONY += $(mrproper-dirs) mrproper archmrproper
1275 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1277 mrproper: clean archmrproper $(mrproper-dirs)
1286 @find $(srctree) $(RCS_FIND_IGNORE) \
1287 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1288 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1289 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
1290 -type f -print | xargs rm -f
1293 # Packaging of the kernel to various formats
1294 # ---------------------------------------------------------------------------
1295 # rpm target kept for backward compatibility
1296 package-dir := scripts/package
1299 $(Q)$(MAKE) $(build)=$(package-dir) $@
1300 %pkg: include/config/kernel.release FORCE
1301 $(Q)$(MAKE) $(build)=$(package-dir) $@
1302 rpm: include/config/kernel.release FORCE
1303 $(Q)$(MAKE) $(build)=$(package-dir) $@
1306 # Brief documentation of the typical targets used
1307 # ---------------------------------------------------------------------------
1309 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1310 boards := $(sort $(notdir $(boards)))
1311 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1312 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1316 @echo 'Cleaning targets:'
1317 @echo ' clean - Remove most generated files but keep the config and'
1318 @echo ' enough build support to build external modules'
1319 @echo ' mrproper - Remove all generated files + config + various backup files'
1320 @echo ' distclean - mrproper + remove editor backup and patch files'
1322 @echo 'Configuration targets:'
1323 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1325 @echo 'Other generic targets:'
1326 @echo ' all - Build all targets marked with [*]'
1327 @echo '* vmlinux - Build the bare kernel'
1328 @echo '* modules - Build all modules'
1329 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1330 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1331 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1332 @echo ' dir/ - Build all files in dir and below'
1333 @echo ' dir/file.[ois] - Build specified target only'
1334 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1335 @echo ' (requires a recent binutils and recent build (System.map))'
1336 @echo ' dir/file.ko - Build module including final link'
1337 @echo ' modules_prepare - Set up for building external modules'
1338 @echo ' tags/TAGS - Generate tags file for editors'
1339 @echo ' cscope - Generate cscope index'
1340 @echo ' gtags - Generate GNU GLOBAL index'
1341 @echo ' kernelrelease - Output the release version string (use with make -s)'
1342 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1343 @echo ' image_name - Output the image name (use with make -s)'
1344 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1345 echo ' (default: $(INSTALL_HDR_PATH))'; \
1347 @echo 'Static analysers'
1348 @echo ' checkstack - Generate a list of stack hogs'
1349 @echo ' namespacecheck - Name space analysis on compiled kernel'
1350 @echo ' versioncheck - Sanity check on version.h usage'
1351 @echo ' includecheck - Check for duplicate included header files'
1352 @echo ' export_report - List the usages of all exported symbols'
1353 @echo ' headers_check - Sanity check on exported headers'
1354 @echo ' headerdep - Detect inclusion cycles in headers'
1355 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1357 @echo 'Kernel selftest'
1358 @echo ' kselftest - Build and run kernel selftest (run as root)'
1359 @echo ' Build, install, and boot kernel before'
1360 @echo ' running kselftest on it'
1361 @echo ' kselftest-clean - Remove all generated kselftest files'
1362 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existed'
1365 @echo 'Kernel packaging:'
1366 @$(MAKE) $(build)=$(package-dir) help
1368 @echo 'Documentation targets:'
1369 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1371 @echo 'Architecture specific targets ($(SRCARCH)):'
1372 @$(if $(archhelp),$(archhelp),\
1373 echo ' No architecture specific help defined for $(SRCARCH)')
1376 $(foreach b, $(boards), \
1377 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1379 @$(if $(board-dirs), \
1380 $(foreach b, $(board-dirs), \
1381 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1382 printf " %-16s - Show all of the above\\n" help-boards; \
1385 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1386 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1387 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1388 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1389 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1390 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1391 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1392 @echo ' 1: warnings which may be relevant and do not occur too often'
1393 @echo ' 2: warnings which occur quite often but may still be relevant'
1394 @echo ' 3: more obscure warnings, can most likely be ignored'
1395 @echo ' Multiple levels can be combined with W=12 or W=123'
1397 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1398 @echo 'For further info see the ./README file'
1401 help-board-dirs := $(addprefix help-,$(board-dirs))
1403 help-boards: $(help-board-dirs)
1405 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1407 $(help-board-dirs): help-%:
1408 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1409 @$(if $(boards-per-dir), \
1410 $(foreach b, $(boards-per-dir), \
1411 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1415 # Documentation targets
1416 # ---------------------------------------------------------------------------
1417 %docs: scripts_basic FORCE
1418 $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1419 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1421 else # KBUILD_EXTMOD
1424 # External module support.
1425 # When building external modules the kernel used as basis is considered
1426 # read-only, and no consistency checks are made and the make
1427 # system is not used on the basis kernel. If updates are required
1428 # in the basis kernel ordinary make commands (without M=...) must
1431 # The following are the only valid targets when building external
1433 # make M=dir clean Delete all automatically generated files
1434 # make M=dir modules Make all modules in specified dir
1435 # make M=dir Same as 'make M=dir modules'
1436 # make M=dir modules_install
1437 # Install the modules built in the module directory
1438 # Assumes install directory is already created
1440 # We are always building modules
1442 PHONY += crmodverdir
1446 PHONY += $(objtree)/Module.symvers
1447 $(objtree)/Module.symvers:
1448 @test -e $(objtree)/Module.symvers || ( \
1450 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1451 echo " is missing; modules will have no dependencies and modversions."; \
1454 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1455 PHONY += $(module-dirs) modules
1456 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1457 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1459 modules: $(module-dirs)
1460 @$(kecho) ' Building modules, stage 2.';
1461 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1463 PHONY += modules_install
1464 modules_install: _emodinst_ _emodinst_post
1466 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1469 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1470 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1472 PHONY += _emodinst_post
1473 _emodinst_post: _emodinst_
1476 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1478 PHONY += $(clean-dirs) clean
1480 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1482 clean: rm-dirs := $(MODVERDIR)
1483 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1487 @echo ' Building external modules.'
1488 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1490 @echo ' modules - default target, build the module(s)'
1491 @echo ' modules_install - install the module'
1492 @echo ' clean - remove generated files in module directory only'
1496 PHONY += prepare scripts
1499 endif # KBUILD_EXTMOD
1501 clean: $(clean-dirs)
1504 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1505 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1509 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1510 -o -name '*.symtypes' -o -name 'modules.order' \
1511 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1512 -o -name '*.gcno' \) -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.