5 NAME = Blurry Fish Butt
8 # To see a list of typical targets execute "make help"
9 # More info can be located in ./README
10 # Comments in this file are targeted only to the developer, do not
11 # expect to learn how to build the kernel reading this file.
13 # o Do not use make's built-in rules and variables
14 # (this increases performance and avoids hard-to-debug behaviour);
15 # o Look for make include files relative to root of kernel src
16 MAKEFLAGS += -rR --include-dir=$(CURDIR)
18 # Avoid funny character set dependencies
22 export LC_COLLATE LC_NUMERIC
24 # Avoid interference with shell env settings
27 # We are using a recursive build, so we need to do a little thinking
28 # to get the ordering right.
30 # Most importantly: sub-Makefiles should only ever modify files in
31 # their own directory. If in some directory we have a dependency on
32 # a file in another dir (which doesn't happen often, but it's often
33 # unavoidable when linking the built-in.o targets which finally
34 # turn into vmlinux), we will call a sub make in that other dir, and
35 # after that we are sure that everything which is in that other dir
38 # The only cases where we need to modify files which have global
39 # effects are thus separated out and done before the recursive
40 # descending is started. They are now explicitly listed as the
44 # ---------------------------------------------------------------------------
46 # Normally, we echo the whole command before executing it. By making
47 # that echo $($(quiet)$(cmd)), we now have the possibility to set
48 # $(quiet) to choose other forms of output instead, e.g.
50 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
51 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
53 # If $(quiet) is empty, the whole command will be printed.
54 # If it is set to "quiet_", only the short version will be printed.
55 # If it is set to "silent_", nothing will be printed at all, since
56 # the variable $(silent_cmd_cc_o_c) doesn't exist.
58 # A simple variant is to prefix commands with $(Q) - that's useful
59 # for commands that shall be hidden in non-verbose mode.
63 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
64 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
66 # To put more focus on warnings, be less verbose as default
67 # Use 'make V=1' to see the full commands
69 ifeq ("$(origin V)", "command line")
76 ifeq ($(KBUILD_VERBOSE),1)
84 # If the user is running make -s (silent mode), suppress echoing of
87 ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
88 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
92 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
97 export quiet Q KBUILD_VERBOSE
99 # kbuild supports saving output files in a separate directory.
100 # To locate output files in a separate directory two syntaxes are supported.
101 # In both cases the working directory must be the root of the kernel src.
103 # Use "make O=dir/to/store/output/files/"
105 # 2) Set KBUILD_OUTPUT
106 # Set the environment variable KBUILD_OUTPUT to point to the directory
107 # where the output files shall be placed.
108 # export KBUILD_OUTPUT=dir/to/store/output/files/
111 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
114 # KBUILD_SRC is set on invocation of make in OBJ directory
115 # KBUILD_SRC is not intended to be used by the regular user (for now)
116 ifeq ($(KBUILD_SRC),)
118 # OK, Make called in directory where kernel src resides
119 # Do we want to locate output files in a separate directory?
120 ifeq ("$(origin O)", "command line")
121 KBUILD_OUTPUT := $(O)
124 # That's our default target when none is given on the command line
128 # Cancel implicit rules on top Makefile
129 $(CURDIR)/Makefile Makefile: ;
131 ifneq ($(KBUILD_OUTPUT),)
132 # Invoke a second make in the output directory, passing relevant variables
133 # check that the output directory actually exists
134 saved-output := $(KBUILD_OUTPUT)
135 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
137 $(if $(KBUILD_OUTPUT),, \
138 $(error failed to create output directory "$(saved-output)"))
140 PHONY += $(MAKECMDGOALS) sub-make
142 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
146 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
147 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
149 # Leave processing to above invocation of make
151 endif # ifneq ($(KBUILD_OUTPUT),)
152 endif # ifeq ($(KBUILD_SRC),)
154 # We process the rest of the Makefile if this is the final invocation of make
155 ifeq ($(skip-makefile),)
157 # Do not print "Entering directory ...",
158 # but we want to display it when entering to the output directory
159 # so that IDEs/editors are able to understand relative filenames.
160 MAKEFLAGS += --no-print-directory
162 # Call a source code checker (by default, "sparse") as part of the
165 # Use 'make C=1' to enable checking of only re-compiled files.
166 # Use 'make C=2' to enable checking of *all* source files, regardless
167 # of whether they are re-compiled or not.
169 # See the file "Documentation/sparse.txt" for more details, including
170 # where to get the "sparse" utility.
172 ifeq ("$(origin C)", "command line")
173 KBUILD_CHECKSRC = $(C)
175 ifndef KBUILD_CHECKSRC
179 # Use make M=dir to specify directory of external module to build
180 # Old syntax make ... SUBDIRS=$PWD is still supported
181 # Setting the environment variable KBUILD_EXTMOD take precedence
183 KBUILD_EXTMOD ?= $(SUBDIRS)
186 ifeq ("$(origin M)", "command line")
187 KBUILD_EXTMOD := $(M)
190 # If building an external module we do not care about the all: rule
191 # but instead _all depend on modules
193 ifeq ($(KBUILD_EXTMOD),)
199 ifeq ($(KBUILD_SRC),)
200 # building in the source tree
203 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
204 # building in a subdirectory of the source tree
207 srctree := $(KBUILD_SRC)
214 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
216 export srctree objtree VPATH
218 # SUBARCH tells the usermode build what the underlying arch is. That is set
219 # first, and if a usermode build is happening, the "ARCH=um" on the command
220 # line overrides the setting of ARCH below. If a native build is happening,
221 # then ARCH is assigned, getting whatever value it gets normally, and
222 # SUBARCH is subsequently ignored.
224 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
225 -e s/sun4u/sparc64/ \
226 -e s/arm.*/arm/ -e s/sa110/arm/ \
227 -e s/s390x/s390/ -e s/parisc64/parisc/ \
228 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
229 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
231 # Cross compiling and selecting different set of gcc/bin-utils
232 # ---------------------------------------------------------------------------
234 # When performing cross compilation for other architectures ARCH shall be set
235 # to the target architecture. (See arch/* for the possibilities).
236 # ARCH can be set during invocation of make:
238 # Another way is to have ARCH set in the environment.
239 # The default ARCH is the host where make is executed.
241 # CROSS_COMPILE specify the prefix used for all executables used
242 # during compilation. Only gcc and related bin-utils executables
243 # are prefixed with $(CROSS_COMPILE).
244 # CROSS_COMPILE can be set on the command line
245 # make CROSS_COMPILE=ia64-linux-
246 # Alternatively CROSS_COMPILE can be set in the environment.
247 # A third alternative is to store a setting in .config so that plain
248 # "make" in the configured kernel build directory always uses that.
249 # Default value for CROSS_COMPILE is not to prefix executables
250 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
252 CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
254 # Architecture as present in compile.h
255 UTS_MACHINE := $(ARCH)
258 # Additional ARCH settings for x86
262 ifeq ($(ARCH),x86_64)
266 # Additional ARCH settings for sparc
267 ifeq ($(ARCH),sparc32)
270 ifeq ($(ARCH),sparc64)
274 # Additional ARCH settings for sh
279 # Additional ARCH settings for tile
280 ifeq ($(ARCH),tilepro)
283 ifeq ($(ARCH),tilegx)
287 # Where to locate arch specific headers
288 hdr-arch := $(SRCARCH)
290 KCONFIG_CONFIG ?= .config
291 export KCONFIG_CONFIG
293 # SHELL used by kbuild
294 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
295 else if [ -x /bin/bash ]; then echo /bin/bash; \
296 else echo sh; fi ; fi)
300 HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
303 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
304 HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
305 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
308 # Decide whether to build built-in, modular, or both.
309 # Normally, just do built-in.
314 # If we have only "make modules", don't compile built-in objects.
315 # When we're building modules with modversions, we need to consider
316 # the built-in objects during the descend as well, in order to
317 # make sure the checksums are up to date before we record them.
319 ifeq ($(MAKECMDGOALS),modules)
320 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
323 # If we have "make <whatever> modules", compile modules
324 # in addition to whatever we do anyway.
325 # Just "make" or "make all" shall build modules as well
327 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
331 ifeq ($(MAKECMDGOALS),)
335 export KBUILD_MODULES KBUILD_BUILTIN
336 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
338 # We need some generic definitions (do not try to remake the file).
339 scripts/Kbuild.include: ;
340 include scripts/Kbuild.include
342 # Make variables (CC, etc...)
343 AS = $(CROSS_COMPILE)as
344 LD = $(CROSS_COMPILE)ld
345 CC = $(CROSS_COMPILE)gcc
347 AR = $(CROSS_COMPILE)ar
348 NM = $(CROSS_COMPILE)nm
349 STRIP = $(CROSS_COMPILE)strip
350 OBJCOPY = $(CROSS_COMPILE)objcopy
351 OBJDUMP = $(CROSS_COMPILE)objdump
353 GENKSYMS = scripts/genksyms/genksyms
354 INSTALLKERNEL := installkernel
355 DEPMOD = /sbin/depmod
360 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
361 -Wbitwise -Wno-return-void $(CF)
367 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
370 # Use USERINCLUDE when you must reference the UAPI directories only.
372 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
373 -Iarch/$(hdr-arch)/include/generated/uapi \
374 -I$(srctree)/include/uapi \
375 -Iinclude/generated/uapi \
376 -include $(srctree)/include/linux/kconfig.h
378 # Use LINUXINCLUDE when you must reference the include/ directory.
379 # Needed to be compatible with the O= option
381 -I$(srctree)/arch/$(hdr-arch)/include \
382 -Iarch/$(hdr-arch)/include/generated/uapi \
383 -Iarch/$(hdr-arch)/include/generated \
384 $(if $(KBUILD_SRC), -I$(srctree)/include) \
388 KBUILD_CPPFLAGS := -D__KERNEL__
390 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
391 -fno-strict-aliasing -fno-common \
392 -Werror-implicit-function-declaration \
393 -Wno-format-security \
396 KBUILD_AFLAGS_KERNEL :=
397 KBUILD_CFLAGS_KERNEL :=
398 KBUILD_AFLAGS := -D__ASSEMBLY__
399 KBUILD_AFLAGS_MODULE := -DMODULE
400 KBUILD_CFLAGS_MODULE := -DMODULE
401 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
403 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
404 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
405 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
407 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
408 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
409 export CPP AR NM STRIP OBJCOPY OBJDUMP
410 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
411 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
413 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
414 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KASAN
415 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
416 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
417 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
418 export KBUILD_ARFLAGS
420 # When compiling out-of-tree modules, put MODVERDIR in the module
421 # tree rather than in the kernel tree. The kernel tree might
423 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
425 # Files to ignore in find ... statements
427 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
428 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
430 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
431 --exclude CVS --exclude .pc --exclude .hg --exclude .git
433 # ===========================================================================
434 # Rules shared between *config targets and build targets
436 # Basic helpers built in scripts/
437 PHONY += scripts_basic
439 $(Q)$(MAKE) $(build)=scripts/basic
440 $(Q)rm -f .tmp_quiet_recordmcount
442 # To avoid any implicit rule to kick in, define an empty command.
443 scripts/basic/%: scripts_basic ;
445 PHONY += outputmakefile
446 # outputmakefile generates a Makefile in the output directory, if using a
447 # separate output directory. This allows convenient use of make in the
450 ifneq ($(KBUILD_SRC),)
451 $(Q)ln -fsn $(srctree) source
452 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
453 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
456 # Support for using generic headers in asm-generic
459 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
460 src=asm obj=arch/$(SRCARCH)/include/generated/asm
461 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
462 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
464 # To make sure we do not include .config for any of the *config targets
465 # catch them early, and hand them over to scripts/kconfig/Makefile
466 # It is allowed to specify more targets when calling make, including
467 # mixing *config targets and build targets.
468 # For example 'make oldconfig all'.
469 # Detect when mixed targets is specified, and make a second invocation
470 # of make so .config is not included in this case either (for *config).
472 version_h := include/generated/uapi/linux/version.h
473 old_version_h := include/linux/version.h
475 no-dot-config-targets := clean mrproper distclean \
476 cscope gtags TAGS tags help% %docs check% coccicheck \
477 $(version_h) headers_% archheaders archscripts \
478 kernelversion %src-pkg
484 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
485 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
490 ifeq ($(KBUILD_EXTMOD),)
491 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
493 ifneq ($(words $(MAKECMDGOALS)),1)
499 ifeq ($(mixed-targets),1)
500 # ===========================================================================
501 # We're called with mixed targets (*config and build targets).
502 # Handle them one by one.
504 PHONY += $(MAKECMDGOALS) __build_one_by_one
506 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
511 for i in $(MAKECMDGOALS); do \
512 $(MAKE) -f $(srctree)/Makefile $$i; \
516 ifeq ($(config-targets),1)
517 # ===========================================================================
518 # *config targets only - make sure prerequisites are updated, and descend
519 # in scripts/kconfig to make the *config target
521 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
522 # KBUILD_DEFCONFIG may point out an alternative default configuration
523 # used for 'make defconfig'
524 include arch/$(SRCARCH)/Makefile
525 export KBUILD_DEFCONFIG KBUILD_KCONFIG
527 config: scripts_basic outputmakefile FORCE
528 $(Q)$(MAKE) $(build)=scripts/kconfig $@
530 %config: scripts_basic outputmakefile FORCE
531 $(Q)$(MAKE) $(build)=scripts/kconfig $@
534 # ===========================================================================
535 # Build targets only - this includes vmlinux, arch specific targets, clean
536 # targets and others. In general all targets except *config targets.
538 ifeq ($(KBUILD_EXTMOD),)
539 # Additional helpers built in scripts/
540 # Carefully list dependencies so we do not try to build scripts twice
543 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
545 $(Q)$(MAKE) $(build)=$(@)
547 # Objects we will link into vmlinux / subdirs we need to visit
549 drivers-y := drivers/ sound/ firmware/
553 endif # KBUILD_EXTMOD
555 ifeq ($(dot-config),1)
557 -include include/config/auto.conf
559 ifeq ($(KBUILD_EXTMOD),)
560 # Read in dependencies to all Kconfig* files, make sure to run
561 # oldconfig if changes are detected.
562 -include include/config/auto.conf.cmd
564 # To avoid any implicit rule to kick in, define an empty command
565 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
567 # If .config is newer than include/config/auto.conf, someone tinkered
568 # with it and forgot to run make oldconfig.
569 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
570 # we execute the config step to be sure to catch updated Kconfig files
571 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
572 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
574 # external modules needs include/generated/autoconf.h and include/config/auto.conf
575 # but do not care if they are up-to-date. Use auto.conf to trigger the test
576 PHONY += include/config/auto.conf
578 include/config/auto.conf:
579 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
581 echo >&2 " ERROR: Kernel configuration is invalid."; \
582 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
583 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
587 endif # KBUILD_EXTMOD
590 # Dummy target needed, because used as prerequisite
591 include/config/auto.conf: ;
592 endif # $(dot-config)
594 # The all: target is the default when no target is given on the
596 # This allow a user to issue only 'make' to build a kernel including modules
597 # Defaults to vmlinux, but the arch makefile usually adds further targets
600 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
601 # values of the respective KBUILD_* variables
605 include arch/$(SRCARCH)/Makefile
607 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
609 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
610 KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
615 # Tell gcc to never replace conditional load with a non-conditional one
616 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
618 ifdef CONFIG_READABLE_ASM
619 # Disable optimizations that make assembler listings hard to read.
620 # reorder blocks reorders the control in the function
621 # ipa clone creates specialized cloned functions
622 # partial inlining inlines only parts of functions
623 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
624 $(call cc-option,-fno-ipa-cp-clone,) \
625 $(call cc-option,-fno-partial-inlining)
628 ifneq ($(CONFIG_FRAME_WARN),0)
629 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
632 # Handle stack protector mode.
634 # Since kbuild can potentially perform two passes (first with the old
635 # .config values and then with updated .config values), we cannot error out
636 # if a desired compiler option is unsupported. If we were to error, kbuild
637 # could never get to the second pass and actually notice that we changed
638 # the option to something that was supported.
640 # Additionally, we don't want to fallback and/or silently change which compiler
641 # flags will be used, since that leads to producing kernels with different
642 # security feature characteristics depending on the compiler used. ("But I
643 # selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
645 # The middle ground is to warn here so that the failed option is obvious, but
646 # to let the build fail with bad compiler flags so that we can't produce a
647 # kernel when there is a CONFIG and compiler mismatch.
649 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
650 stackp-flag := -fstack-protector
651 ifeq ($(call cc-option, $(stackp-flag)),)
652 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
653 -fstack-protector not supported by compiler)
656 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
657 stackp-flag := -fstack-protector-strong
658 ifeq ($(call cc-option, $(stackp-flag)),)
659 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
660 -fstack-protector-strong not supported by compiler)
663 # Force off for distro compilers that enable stack protector by default.
664 stackp-flag := $(call cc-option, -fno-stack-protector)
667 KBUILD_CFLAGS += $(stackp-flag)
669 ifeq ($(cc-name),clang)
670 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
671 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
672 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
673 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
674 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
675 # Quiet clang warning: comparison of unsigned expression < 0 is always false
676 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
677 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
678 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
679 # See modpost pattern 2
680 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
681 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
684 # This warning generated too much noise in a regular build.
685 # Use make W=1 to enable this warning (see scripts/Makefile.build)
686 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
689 ifdef CONFIG_FRAME_POINTER
690 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
692 # Some targets (ARM with Thumb2, for example), can't be built with frame
693 # pointers. For those, we don't have FUNCTION_TRACER automatically
694 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
695 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
696 # -fomit-frame-pointer with FUNCTION_TRACER.
697 ifndef CONFIG_FUNCTION_TRACER
698 KBUILD_CFLAGS += -fomit-frame-pointer
702 KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
704 ifdef CONFIG_DEBUG_INFO
705 ifdef CONFIG_DEBUG_INFO_SPLIT
706 KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
710 KBUILD_AFLAGS += -Wa,-gdwarf-2
712 ifdef CONFIG_DEBUG_INFO_DWARF4
713 KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
716 ifdef CONFIG_DEBUG_INFO_REDUCED
717 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
718 $(call cc-option,-fno-var-tracking)
721 ifdef CONFIG_FUNCTION_TRACER
722 ifndef CC_FLAGS_FTRACE
723 CC_FLAGS_FTRACE := -pg
725 export CC_FLAGS_FTRACE
726 ifdef CONFIG_HAVE_FENTRY
727 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
729 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
730 KBUILD_AFLAGS += $(CC_USING_FENTRY)
731 ifdef CONFIG_DYNAMIC_FTRACE
732 ifdef CONFIG_HAVE_C_RECORDMCOUNT
733 BUILD_C_RECORDMCOUNT := y
734 export BUILD_C_RECORDMCOUNT
739 # We trigger additional mismatches with less inlining
740 ifdef CONFIG_DEBUG_SECTION_MISMATCH
741 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
744 # arch Makefile may override CC so keep this after arch Makefile is included
745 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
746 CHECKFLAGS += $(NOSTDINC_FLAGS)
748 # warn about C99 declaration after statement
749 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
751 # disable pointer signed / unsigned warnings in gcc 4.0
752 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
754 # disable invalid "can't wrap" optimizations for signed / pointers
755 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
757 # conserve stack if available
758 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
760 # disallow errors like 'EXPORT_GPL(foo);' with missing header
761 KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
763 # require functions to have arguments in prototypes, not empty 'int foo()'
764 KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
766 # Prohibit date/time macros, which would make the build non-deterministic
767 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
769 # use the deterministic mode of AR if available
770 KBUILD_ARFLAGS := $(call ar-option,D)
772 # check for 'asm goto'
773 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
774 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
775 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
778 include scripts/Makefile.kasan
779 include scripts/Makefile.extrawarn
781 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
783 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
784 KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
785 KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
787 # Use --build-id when available.
788 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
789 $(call cc-ldoption, -Wl$(comma)--build-id,))
790 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
791 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
793 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
794 LDFLAGS_vmlinux += $(call ld-option, -X,)
797 # Default kernel image to build when no specific target is given.
798 # KBUILD_IMAGE may be overruled on the command line or
799 # set in the environment
800 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
802 export KBUILD_IMAGE ?= vmlinux
805 # INSTALL_PATH specifies where to place the updated kernel and system map
806 # images. Default is /boot, but you can set it to other values
807 export INSTALL_PATH ?= /boot
810 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
811 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
812 # an argument if needed. Otherwise it defaults to the kernel install path
814 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
817 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
818 # relocations required by build roots. This is not defined in the
819 # makefile but the argument can be passed to make if needed.
822 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
826 # INSTALL_MOD_STRIP, if defined, will cause modules to be
827 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
828 # the default option --strip-debug will be used. Otherwise,
829 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
831 ifdef INSTALL_MOD_STRIP
832 ifeq ($(INSTALL_MOD_STRIP),1)
833 mod_strip_cmd = $(STRIP) --strip-debug
835 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
836 endif # INSTALL_MOD_STRIP=1
839 endif # INSTALL_MOD_STRIP
842 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
843 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
844 # or CONFIG_MODULE_COMPRESS_XZ.
846 mod_compress_cmd = true
847 ifdef CONFIG_MODULE_COMPRESS
848 ifdef CONFIG_MODULE_COMPRESS_GZIP
849 mod_compress_cmd = gzip -n -f
850 endif # CONFIG_MODULE_COMPRESS_GZIP
851 ifdef CONFIG_MODULE_COMPRESS_XZ
852 mod_compress_cmd = xz -f
853 endif # CONFIG_MODULE_COMPRESS_XZ
854 endif # CONFIG_MODULE_COMPRESS
855 export mod_compress_cmd
857 # Select initial ramdisk compression format, default is gzip(1).
858 # This shall be used by the dracut(8) tool while creating an initramfs image.
860 INITRD_COMPRESS-y := gzip
861 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
862 INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
863 INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
864 INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
865 INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
866 # do not export INITRD_COMPRESS, since we didn't actually
867 # choose a sane default compression above.
868 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
870 ifdef CONFIG_MODULE_SIG_ALL
871 $(eval $(call config_filename,MODULE_SIG_KEY))
873 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
880 ifeq ($(KBUILD_EXTMOD),)
881 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
883 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
884 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
885 $(net-y) $(net-m) $(libs-y) $(libs-m)))
887 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
888 $(init-) $(core-) $(drivers-) $(net-) $(libs-))))
890 init-y := $(patsubst %/, %/built-in.o, $(init-y))
891 core-y := $(patsubst %/, %/built-in.o, $(core-y))
892 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
893 net-y := $(patsubst %/, %/built-in.o, $(net-y))
894 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
895 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
896 libs-y := $(libs-y1) $(libs-y2)
898 # Externally visible symbols (used by link-vmlinux.sh)
899 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
900 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
901 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
902 export LDFLAGS_vmlinux
903 # used by scripts/pacmage/Makefile
904 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
906 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
908 # Final link of vmlinux
909 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
910 quiet_cmd_link-vmlinux = LINK $@
912 # Include targets which we want to
913 # execute if the rest of the kernel build went well.
914 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
915 ifdef CONFIG_HEADERS_CHECK
916 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
919 $(Q)$(MAKE) $(build)=samples
921 ifdef CONFIG_BUILD_DOCSRC
922 $(Q)$(MAKE) $(build)=Documentation
924 ifdef CONFIG_GDB_SCRIPTS
925 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
927 +$(call if_changed,link-vmlinux)
929 # The actual objects are generated when descending,
930 # make sure no implicit rule kicks in
931 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
933 # Handle descending into subdirectories listed in $(vmlinux-dirs)
934 # Preset locale variables to speed up the build process. Limit locale
935 # tweaks to this spot to avoid wrong language settings when running
936 # make menuconfig etc.
937 # Error messages still appears in the original language
939 PHONY += $(vmlinux-dirs)
940 $(vmlinux-dirs): prepare scripts
941 $(Q)$(MAKE) $(build)=$@
943 define filechk_kernel.release
944 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
947 # Store (new) KERNELRELEASE string in include/config/kernel.release
948 include/config/kernel.release: include/config/auto.conf FORCE
949 $(call filechk,kernel.release)
952 # Things we need to do before we recursively start building the kernel
953 # or the modules are listed in "prepare".
954 # A multi level approach is used. prepareN is processed before prepareN-1.
955 # archprepare is used in arch Makefiles and when processed asm symlink,
956 # version.h and scripts_basic is processed / created.
958 # Listed in dependency order
959 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
961 # prepare3 is used to check if we are building in a separate output directory,
963 # 1) Check that make has not been executed in the kernel src $(srctree)
964 prepare3: include/config/kernel.release
965 ifneq ($(KBUILD_SRC),)
966 @$(kecho) ' Using $(srctree) as source for kernel'
967 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
968 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
969 echo >&2 " in the '$(srctree)' directory.";\
974 # prepare2 creates a makefile if using a separate output directory
975 prepare2: prepare3 outputmakefile asm-generic
977 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
978 include/config/auto.conf
981 archprepare: archheaders archscripts prepare1 scripts_basic
983 prepare0: archprepare FORCE
984 $(Q)$(MAKE) $(build)=.
986 # All the preparing..
989 # Generate some files
990 # ---------------------------------------------------------------------------
992 # KERNELRELEASE can change from a few different places, meaning version.h
993 # needs to be updated, so this check is forced on all builds
996 define filechk_utsrelease.h
997 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
998 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1001 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1004 define filechk_version.h
1005 (echo \#define LINUX_VERSION_CODE $(shell \
1006 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1007 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1010 $(version_h): $(srctree)/Makefile FORCE
1011 $(call filechk,version.h)
1012 $(Q)rm -f $(old_version_h)
1014 include/generated/utsrelease.h: include/config/kernel.release FORCE
1015 $(call filechk,utsrelease.h)
1019 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1020 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1022 # ---------------------------------------------------------------------------
1024 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1025 export INSTALL_FW_PATH
1027 PHONY += firmware_install
1028 firmware_install: FORCE
1029 @mkdir -p $(objtree)/firmware
1030 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1032 # ---------------------------------------------------------------------------
1035 #Default location for installed headers
1036 export INSTALL_HDR_PATH = $(objtree)/usr
1038 # If we do an all arch process set dst to asm-$(hdr-arch)
1039 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1041 PHONY += archheaders
1044 PHONY += archscripts
1048 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1049 $(Q)$(MAKE) $(build)=scripts build_unifdef
1051 PHONY += headers_install_all
1052 headers_install_all:
1053 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1055 PHONY += headers_install
1056 headers_install: __headers
1057 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1058 $(error Headers not exportable for the $(SRCARCH) architecture))
1059 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1060 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1062 PHONY += headers_check_all
1063 headers_check_all: headers_install_all
1064 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1066 PHONY += headers_check
1067 headers_check: headers_install
1068 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1069 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1071 # ---------------------------------------------------------------------------
1076 $(Q)$(MAKE) -C tools/testing/selftests run_tests
1078 # ---------------------------------------------------------------------------
1081 ifdef CONFIG_MODULES
1083 # By default, build modules as well
1089 # A module can be listed more than once in obj-m resulting in
1090 # duplicate lines in modules.order files. Those are removed
1091 # using awk while concatenating to the final file.
1094 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1095 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1096 @$(kecho) ' Building modules, stage 2.';
1097 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1098 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1100 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1101 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1103 %/modules.builtin: include/config/auto.conf
1104 $(Q)$(MAKE) $(modbuiltin)=$*
1107 # Target to prepare building external modules
1108 PHONY += modules_prepare
1109 modules_prepare: prepare scripts
1111 # Target to install modules
1112 PHONY += modules_install
1113 modules_install: _modinst_ _modinst_post
1117 @rm -rf $(MODLIB)/kernel
1118 @rm -f $(MODLIB)/source
1119 @mkdir -p $(MODLIB)/kernel
1120 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1121 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1122 rm -f $(MODLIB)/build ; \
1123 ln -s $(CURDIR) $(MODLIB)/build ; \
1125 @cp -f $(objtree)/modules.order $(MODLIB)/
1126 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1127 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1129 # This depmod is only for convenience to give the initial
1130 # boot a modules.dep even before / is mounted read-write. However the
1131 # boot script depmod is the master version.
1132 PHONY += _modinst_post
1133 _modinst_post: _modinst_
1134 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1137 ifeq ($(CONFIG_MODULE_SIG), y)
1138 PHONY += modules_sign
1140 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1143 else # CONFIG_MODULES
1145 # Modules not configured
1146 # ---------------------------------------------------------------------------
1148 modules modules_install: FORCE
1150 @echo >&2 "The present kernel configuration has modules disabled."
1151 @echo >&2 "Type 'make config' and enable loadable module support."
1152 @echo >&2 "Then build a kernel with module support enabled."
1156 endif # CONFIG_MODULES
1159 # Cleaning is done on three levels.
1160 # make clean Delete most generated files
1161 # Leave enough to build external modules
1162 # make mrproper Delete the current configuration, and all generated files
1163 # make distclean Remove editor backup files, patch leftover files and the like
1165 # Directories & files removed with 'make clean'
1166 CLEAN_DIRS += $(MODVERDIR)
1168 # Directories & files removed with 'make mrproper'
1169 MRPROPER_DIRS += include/config usr/include include/generated \
1170 arch/*/include/generated .tmp_objdiff
1171 MRPROPER_FILES += .config .config.old .version .old_version \
1172 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1173 signing_key.pem signing_key.priv signing_key.x509 \
1174 x509.genkey extra_certificates signing_key.x509.keyid \
1175 signing_key.x509.signer vmlinux-gdb.py
1177 # clean - Delete most, but leave enough to build external modules
1179 clean: rm-dirs := $(CLEAN_DIRS)
1180 clean: rm-files := $(CLEAN_FILES)
1181 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1183 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1185 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1188 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1190 clean: archclean vmlinuxclean
1192 # mrproper - Delete all generated files, including .config
1194 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1195 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1196 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1198 PHONY += $(mrproper-dirs) mrproper archmrproper
1200 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1202 mrproper: clean archmrproper $(mrproper-dirs)
1211 @find $(srctree) $(RCS_FIND_IGNORE) \
1212 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1213 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1214 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
1215 -type f -print | xargs rm -f
1218 # Packaging of the kernel to various formats
1219 # ---------------------------------------------------------------------------
1220 # rpm target kept for backward compatibility
1221 package-dir := scripts/package
1224 $(Q)$(MAKE) $(build)=$(package-dir) $@
1225 %pkg: include/config/kernel.release FORCE
1226 $(Q)$(MAKE) $(build)=$(package-dir) $@
1227 rpm: include/config/kernel.release FORCE
1228 $(Q)$(MAKE) $(build)=$(package-dir) $@
1231 # Brief documentation of the typical targets used
1232 # ---------------------------------------------------------------------------
1234 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1235 boards := $(sort $(notdir $(boards)))
1236 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1237 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1240 @echo 'Cleaning targets:'
1241 @echo ' clean - Remove most generated files but keep the config and'
1242 @echo ' enough build support to build external modules'
1243 @echo ' mrproper - Remove all generated files + config + various backup files'
1244 @echo ' distclean - mrproper + remove editor backup and patch files'
1246 @echo 'Configuration targets:'
1247 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1249 @echo 'Other generic targets:'
1250 @echo ' all - Build all targets marked with [*]'
1251 @echo '* vmlinux - Build the bare kernel'
1252 @echo '* modules - Build all modules'
1253 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1254 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1255 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1256 @echo ' dir/ - Build all files in dir and below'
1257 @echo ' dir/file.[oisS] - Build specified target only'
1258 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1259 @echo ' (requires a recent binutils and recent build (System.map))'
1260 @echo ' dir/file.ko - Build module including final link'
1261 @echo ' modules_prepare - Set up for building external modules'
1262 @echo ' tags/TAGS - Generate tags file for editors'
1263 @echo ' cscope - Generate cscope index'
1264 @echo ' gtags - Generate GNU GLOBAL index'
1265 @echo ' kernelrelease - Output the release version string (use with make -s)'
1266 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1267 @echo ' image_name - Output the image name (use with make -s)'
1268 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1269 echo ' (default: $(INSTALL_HDR_PATH))'; \
1271 @echo 'Static analysers'
1272 @echo ' checkstack - Generate a list of stack hogs'
1273 @echo ' namespacecheck - Name space analysis on compiled kernel'
1274 @echo ' versioncheck - Sanity check on version.h usage'
1275 @echo ' includecheck - Check for duplicate included header files'
1276 @echo ' export_report - List the usages of all exported symbols'
1277 @echo ' headers_check - Sanity check on exported headers'
1278 @echo ' headerdep - Detect inclusion cycles in headers'
1279 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1281 @echo 'Kernel selftest'
1282 @echo ' kselftest - Build and run kernel selftest (run as root)'
1283 @echo ' Build, install, and boot kernel before'
1284 @echo ' running kselftest on it'
1286 @echo 'Kernel packaging:'
1287 @$(MAKE) $(build)=$(package-dir) help
1289 @echo 'Documentation targets:'
1290 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1292 @echo 'Architecture specific targets ($(SRCARCH)):'
1293 @$(if $(archhelp),$(archhelp),\
1294 echo ' No architecture specific help defined for $(SRCARCH)')
1297 $(foreach b, $(boards), \
1298 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1300 @$(if $(board-dirs), \
1301 $(foreach b, $(board-dirs), \
1302 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1303 printf " %-16s - Show all of the above\\n" help-boards; \
1306 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1307 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1308 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1309 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1310 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1311 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1312 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1313 @echo ' 1: warnings which may be relevant and do not occur too often'
1314 @echo ' 2: warnings which occur quite often but may still be relevant'
1315 @echo ' 3: more obscure warnings, can most likely be ignored'
1316 @echo ' Multiple levels can be combined with W=12 or W=123'
1318 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1319 @echo 'For further info see the ./README file'
1322 help-board-dirs := $(addprefix help-,$(board-dirs))
1324 help-boards: $(help-board-dirs)
1326 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1328 $(help-board-dirs): help-%:
1329 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1330 @$(if $(boards-per-dir), \
1331 $(foreach b, $(boards-per-dir), \
1332 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1336 # Documentation targets
1337 # ---------------------------------------------------------------------------
1338 %docs: scripts_basic FORCE
1339 $(Q)$(MAKE) $(build)=scripts build_docproc
1340 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1342 else # KBUILD_EXTMOD
1345 # External module support.
1346 # When building external modules the kernel used as basis is considered
1347 # read-only, and no consistency checks are made and the make
1348 # system is not used on the basis kernel. If updates are required
1349 # in the basis kernel ordinary make commands (without M=...) must
1352 # The following are the only valid targets when building external
1354 # make M=dir clean Delete all automatically generated files
1355 # make M=dir modules Make all modules in specified dir
1356 # make M=dir Same as 'make M=dir modules'
1357 # make M=dir modules_install
1358 # Install the modules built in the module directory
1359 # Assumes install directory is already created
1361 # We are always building modules
1363 PHONY += crmodverdir
1367 PHONY += $(objtree)/Module.symvers
1368 $(objtree)/Module.symvers:
1369 @test -e $(objtree)/Module.symvers || ( \
1371 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1372 echo " is missing; modules will have no dependencies and modversions."; \
1375 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1376 PHONY += $(module-dirs) modules
1377 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1378 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1380 modules: $(module-dirs)
1381 @$(kecho) ' Building modules, stage 2.';
1382 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1384 PHONY += modules_install
1385 modules_install: _emodinst_ _emodinst_post
1387 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1390 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1391 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1393 PHONY += _emodinst_post
1394 _emodinst_post: _emodinst_
1397 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1399 PHONY += $(clean-dirs) clean
1401 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1403 clean: rm-dirs := $(MODVERDIR)
1404 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1407 @echo ' Building external modules.'
1408 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1410 @echo ' modules - default target, build the module(s)'
1411 @echo ' modules_install - install the module'
1412 @echo ' clean - remove generated files in module directory only'
1416 PHONY += prepare scripts
1419 endif # KBUILD_EXTMOD
1421 clean: $(clean-dirs)
1424 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1425 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1429 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1430 -o -name '*.symtypes' -o -name 'modules.order' \
1431 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1432 -o -name '*.gcno' \) -type f -print | xargs rm -f
1434 # Generate tags for editors
1435 # ---------------------------------------------------------------------------
1436 quiet_cmd_tags = GEN $@
1437 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1439 tags TAGS cscope gtags: FORCE
1442 # Scripts to check various things for consistency
1443 # ---------------------------------------------------------------------------
1445 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1448 find $(srctree)/* $(RCS_FIND_IGNORE) \
1449 -name '*.[hcS]' -type f -print | sort \
1450 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1453 find $(srctree)/* $(RCS_FIND_IGNORE) \
1454 -name '*.[hcS]' -type f -print | sort \
1455 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1458 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1461 $(PERL) $(srctree)/scripts/namespace.pl
1464 $(PERL) $(srctree)/scripts/export_report.pl
1466 endif #ifeq ($(config-targets),1)
1467 endif #ifeq ($(mixed-targets),1)
1469 PHONY += checkstack kernelrelease kernelversion image_name
1471 # UML needs a little special treatment here. It wants to use the host
1472 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1473 # else wants $(ARCH), including people doing cross-builds, which means
1474 # that $(SUBARCH) doesn't work here.
1476 CHECKSTACK_ARCH := $(SUBARCH)
1478 CHECKSTACK_ARCH := $(ARCH)
1481 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1482 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1485 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1488 @echo $(KERNELVERSION)
1491 @echo $(KBUILD_IMAGE)
1493 # Clear a bunch of variables before executing the submake
1495 $(Q)mkdir -p $(objtree)/tools
1496 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(O) subdir=tools -C $(src)/tools/
1499 $(Q)mkdir -p $(objtree)/tools
1500 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(O) subdir=tools -C $(src)/tools/ $*
1503 # ---------------------------------------------------------------------------
1504 # Single targets are compatible with:
1505 # - build with mixed source and output
1506 # - build with separate output dir 'make O=...'
1507 # - external modules
1509 # target-dir => where to store outputfile
1510 # build-dir => directory in kernel source tree to use
1512 ifeq ($(KBUILD_EXTMOD),)
1513 build-dir = $(patsubst %/,%,$(dir $@))
1514 target-dir = $(dir $@)
1516 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1517 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1518 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1521 %.s: %.c prepare scripts FORCE
1522 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1523 %.i: %.c prepare scripts FORCE
1524 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1525 %.o: %.c prepare scripts FORCE
1526 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1527 %.lst: %.c prepare scripts FORCE
1528 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1529 %.s: %.S prepare scripts FORCE
1530 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1531 %.o: %.S prepare scripts FORCE
1532 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1533 %.symtypes: %.c prepare scripts FORCE
1534 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1537 /: prepare scripts FORCE
1539 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1540 $(build)=$(build-dir)
1541 # Make sure the latest headers are built for Documentation
1542 Documentation/: headers_install
1543 %/: prepare scripts FORCE
1545 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1546 $(build)=$(build-dir)
1547 %.ko: prepare scripts FORCE
1549 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1550 $(build)=$(build-dir) $(@:.ko=.o)
1551 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1553 # FIXME Should go into a make.lib or something
1554 # ===========================================================================
1556 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1557 cmd_rmdirs = rm -rf $(rm-dirs)
1559 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1560 cmd_rmfiles = rm -f $(rm-files)
1562 # Run depmod only if we have System.map and depmod is executable
1563 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1564 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1565 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1567 # Create temporary dir for module support files
1568 # clean it up only when building all modules
1569 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1570 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1572 # read all saved command lines
1574 targets := $(wildcard $(sort $(targets)))
1575 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1577 ifneq ($(cmd_files),)
1578 $(cmd_files): ; # Do not try to update included dependency files
1579 include $(cmd_files)
1582 endif # skip-makefile
1587 # Declare the contents of the .PHONY variable as phony. We keep that
1588 # information in a variable so we can use it in if_changed and friends.