5 NAME = Museum of Fishiegoodies
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.
14 # o use make's built-in rules and variables
15 # (this increases performance and avoids hard-to-debug behaviour);
16 # o print "Entering directory ...";
17 MAKEFLAGS += -rR --no-print-directory
19 # Avoid funny character set dependencies
23 export LC_COLLATE LC_NUMERIC
25 # Avoid interference with shell env settings
28 # We are using a recursive build, so we need to do a little thinking
29 # to get the ordering right.
31 # Most importantly: sub-Makefiles should only ever modify files in
32 # their own directory. If in some directory we have a dependency on
33 # a file in another dir (which doesn't happen often, but it's often
34 # unavoidable when linking the built-in.o targets which finally
35 # turn into vmlinux), we will call a sub make in that other dir, and
36 # after that we are sure that everything which is in that other dir
39 # The only cases where we need to modify files which have global
40 # effects are thus separated out and done before the recursive
41 # descending is started. They are now explicitly listed as the
45 # ---------------------------------------------------------------------------
47 # Normally, we echo the whole command before executing it. By making
48 # that echo $($(quiet)$(cmd)), we now have the possibility to set
49 # $(quiet) to choose other forms of output instead, e.g.
51 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
52 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
54 # If $(quiet) is empty, the whole command will be printed.
55 # If it is set to "quiet_", only the short version will be printed.
56 # If it is set to "silent_", nothing will be printed at all, since
57 # the variable $(silent_cmd_cc_o_c) doesn't exist.
59 # A simple variant is to prefix commands with $(Q) - that's useful
60 # for commands that shall be hidden in non-verbose mode.
64 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
65 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
67 # To put more focus on warnings, be less verbose as default
68 # Use 'make V=1' to see the full commands
70 ifeq ("$(origin V)", "command line")
77 ifeq ($(KBUILD_VERBOSE),1)
85 # If the user is running make -s (silent mode), suppress echoing of
88 ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
89 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
93 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
98 export quiet Q KBUILD_VERBOSE
100 # Call a source code checker (by default, "sparse") as part of the
103 # Use 'make C=1' to enable checking of only re-compiled files.
104 # Use 'make C=2' to enable checking of *all* source files, regardless
105 # of whether they are re-compiled or not.
107 # See the file "Documentation/sparse.txt" for more details, including
108 # where to get the "sparse" utility.
110 ifeq ("$(origin C)", "command line")
111 KBUILD_CHECKSRC = $(C)
113 ifndef KBUILD_CHECKSRC
117 # Use make M=dir to specify directory of external module to build
118 # Old syntax make ... SUBDIRS=$PWD is still supported
119 # Setting the environment variable KBUILD_EXTMOD take precedence
121 KBUILD_EXTMOD ?= $(SUBDIRS)
124 ifeq ("$(origin M)", "command line")
125 KBUILD_EXTMOD := $(M)
128 # kbuild supports saving output files in a separate directory.
129 # To locate output files in a separate directory two syntaxes are supported.
130 # In both cases the working directory must be the root of the kernel src.
132 # Use "make O=dir/to/store/output/files/"
134 # 2) Set KBUILD_OUTPUT
135 # Set the environment variable KBUILD_OUTPUT to point to the directory
136 # where the output files shall be placed.
137 # export KBUILD_OUTPUT=dir/to/store/output/files/
140 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
144 # KBUILD_SRC is set on invocation of make in OBJ directory
145 # KBUILD_SRC is not intended to be used by the regular user (for now)
146 ifeq ($(KBUILD_SRC),)
148 # OK, Make called in directory where kernel src resides
149 # Do we want to locate output files in a separate directory?
150 ifeq ("$(origin O)", "command line")
151 KBUILD_OUTPUT := $(O)
154 # That's our default target when none is given on the command line
158 # Cancel implicit rules on top Makefile
159 $(CURDIR)/Makefile Makefile: ;
161 ifneq ($(KBUILD_OUTPUT),)
162 # Invoke a second make in the output directory, passing relevant variables
163 # check that the output directory actually exists
164 saved-output := $(KBUILD_OUTPUT)
165 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
167 $(if $(KBUILD_OUTPUT),, \
168 $(error failed to create output directory "$(saved-output)"))
170 PHONY += $(MAKECMDGOALS) sub-make
172 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
175 # Fake the "Entering directory" message once, so that IDEs/editors are
176 # able to understand relative filenames.
178 quiet_echodir := @echo
181 $($(quiet)echodir) "make[1]: Entering directory \`$(KBUILD_OUTPUT)'"
182 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
183 KBUILD_SRC=$(CURDIR) \
184 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
185 $(filter-out _all sub-make,$(MAKECMDGOALS))
187 # Leave processing to above invocation of make
189 endif # ifneq ($(KBUILD_OUTPUT),)
190 endif # ifeq ($(KBUILD_SRC),)
192 # We process the rest of the Makefile if this is the final invocation of make
193 ifeq ($(skip-makefile),)
195 # If building an external module we do not care about the all: rule
196 # but instead _all depend on modules
198 ifeq ($(KBUILD_EXTMOD),)
204 ifeq ($(KBUILD_SRC),)
205 # building in the source tree
208 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
209 # building in a subdirectory of the source tree
212 srctree := $(KBUILD_SRC)
219 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
221 export srctree objtree VPATH
224 # SUBARCH tells the usermode build what the underlying arch is. That is set
225 # first, and if a usermode build is happening, the "ARCH=um" on the command
226 # line overrides the setting of ARCH below. If a native build is happening,
227 # then ARCH is assigned, getting whatever value it gets normally, and
228 # SUBARCH is subsequently ignored.
230 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
231 -e s/sun4u/sparc64/ \
232 -e s/arm.*/arm/ -e s/sa110/arm/ \
233 -e s/s390x/s390/ -e s/parisc64/parisc/ \
234 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
235 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
237 # Cross compiling and selecting different set of gcc/bin-utils
238 # ---------------------------------------------------------------------------
240 # When performing cross compilation for other architectures ARCH shall be set
241 # to the target architecture. (See arch/* for the possibilities).
242 # ARCH can be set during invocation of make:
244 # Another way is to have ARCH set in the environment.
245 # The default ARCH is the host where make is executed.
247 # CROSS_COMPILE specify the prefix used for all executables used
248 # during compilation. Only gcc and related bin-utils executables
249 # are prefixed with $(CROSS_COMPILE).
250 # CROSS_COMPILE can be set on the command line
251 # make CROSS_COMPILE=ia64-linux-
252 # Alternatively CROSS_COMPILE can be set in the environment.
253 # A third alternative is to store a setting in .config so that plain
254 # "make" in the configured kernel build directory always uses that.
255 # Default value for CROSS_COMPILE is not to prefix executables
256 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
258 CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
260 # Architecture as present in compile.h
261 UTS_MACHINE := $(ARCH)
264 # Additional ARCH settings for x86
268 ifeq ($(ARCH),x86_64)
272 # Additional ARCH settings for sparc
273 ifeq ($(ARCH),sparc32)
276 ifeq ($(ARCH),sparc64)
280 # Additional ARCH settings for sh
285 # Additional ARCH settings for tile
286 ifeq ($(ARCH),tilepro)
289 ifeq ($(ARCH),tilegx)
293 # Where to locate arch specific headers
294 hdr-arch := $(SRCARCH)
296 KCONFIG_CONFIG ?= .config
297 export KCONFIG_CONFIG
299 # SHELL used by kbuild
300 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
301 else if [ -x /bin/bash ]; then echo /bin/bash; \
302 else echo sh; fi ; fi)
306 HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
309 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
310 HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
311 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
314 # Decide whether to build built-in, modular, or both.
315 # Normally, just do built-in.
320 # If we have only "make modules", don't compile built-in objects.
321 # When we're building modules with modversions, we need to consider
322 # the built-in objects during the descend as well, in order to
323 # make sure the checksums are up to date before we record them.
325 ifeq ($(MAKECMDGOALS),modules)
326 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
329 # If we have "make <whatever> modules", compile modules
330 # in addition to whatever we do anyway.
331 # Just "make" or "make all" shall build modules as well
333 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
337 ifeq ($(MAKECMDGOALS),)
341 export KBUILD_MODULES KBUILD_BUILTIN
342 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
345 ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1)
353 # Look for make include files relative to root of kernel src
354 MAKEFLAGS += --include-dir=$(srctree)
356 # We need some generic definitions (do not try to remake the file).
357 $(srctree)/scripts/Kbuild.include: ;
358 include $(srctree)/scripts/Kbuild.include
360 # Make variables (CC, etc...)
361 AS = $(CROSS_COMPILE)as
362 LD = $(CROSS_COMPILE)ld
363 CC = $(CROSS_COMPILE)gcc
365 AR = $(CROSS_COMPILE)ar
366 NM = $(CROSS_COMPILE)nm
367 STRIP = $(CROSS_COMPILE)strip
368 OBJCOPY = $(CROSS_COMPILE)objcopy
369 OBJDUMP = $(CROSS_COMPILE)objdump
371 GENKSYMS = scripts/genksyms/genksyms
372 INSTALLKERNEL := installkernel
373 DEPMOD = /sbin/depmod
377 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
378 -Wbitwise -Wno-return-void $(CF)
384 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage -fno-tree-loop-im
387 # Use USERINCLUDE when you must reference the UAPI directories only.
389 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
390 -Iarch/$(hdr-arch)/include/generated/uapi \
391 -I$(srctree)/include/uapi \
392 -Iinclude/generated/uapi \
393 -include $(srctree)/include/linux/kconfig.h
395 # Use LINUXINCLUDE when you must reference the include/ directory.
396 # Needed to be compatible with the O= option
398 -I$(srctree)/arch/$(hdr-arch)/include \
399 -Iarch/$(hdr-arch)/include/generated \
400 $(if $(KBUILD_SRC), -I$(srctree)/include) \
404 KBUILD_CPPFLAGS := -D__KERNEL__
406 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
407 -fno-strict-aliasing -fno-common \
408 -Werror-implicit-function-declaration \
409 -Wno-format-security \
410 -std=gnu89 $(call cc-option,-fno-PIE)
413 KBUILD_AFLAGS_KERNEL :=
414 KBUILD_CFLAGS_KERNEL :=
415 KBUILD_AFLAGS := -D__ASSEMBLY__ $(call cc-option,-fno-PIE)
416 KBUILD_AFLAGS_MODULE := -DMODULE
417 KBUILD_CFLAGS_MODULE := -DMODULE
418 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
420 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
421 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
422 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
424 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
425 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
426 export CPP AR NM STRIP OBJCOPY OBJDUMP
427 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
428 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
430 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
431 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
432 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
433 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
434 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
435 export KBUILD_ARFLAGS
437 # When compiling out-of-tree modules, put MODVERDIR in the module
438 # tree rather than in the kernel tree. The kernel tree might
440 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
442 # Files to ignore in find ... statements
444 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
445 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
447 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
448 --exclude CVS --exclude .pc --exclude .hg --exclude .git
450 # ===========================================================================
451 # Rules shared between *config targets and build targets
453 # Basic helpers built in scripts/
454 PHONY += scripts_basic
456 $(Q)$(MAKE) $(build)=scripts/basic
457 $(Q)rm -f .tmp_quiet_recordmcount
459 # To avoid any implicit rule to kick in, define an empty command.
460 scripts/basic/%: scripts_basic ;
462 PHONY += outputmakefile
463 # outputmakefile generates a Makefile in the output directory, if using a
464 # separate output directory. This allows convenient use of make in the
467 ifneq ($(KBUILD_SRC),)
468 $(Q)ln -fsn $(srctree) source
469 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
470 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
473 # Support for using generic headers in asm-generic
476 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
477 src=asm obj=arch/$(SRCARCH)/include/generated/asm
478 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
479 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
481 # To make sure we do not include .config for any of the *config targets
482 # catch them early, and hand them over to scripts/kconfig/Makefile
483 # It is allowed to specify more targets when calling make, including
484 # mixing *config targets and build targets.
485 # For example 'make oldconfig all'.
486 # Detect when mixed targets is specified, and make a second invocation
487 # of make so .config is not included in this case either (for *config).
489 version_h := include/generated/uapi/linux/version.h
491 no-dot-config-targets := clean mrproper distclean \
492 cscope gtags TAGS tags help %docs check% coccicheck \
493 $(version_h) headers_% archheaders archscripts \
494 kernelversion %src-pkg
500 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
501 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
506 ifeq ($(KBUILD_EXTMOD),)
507 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
509 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
515 ifeq ($(mixed-targets),1)
516 # ===========================================================================
517 # We're called with mixed targets (*config and build targets).
518 # Handle them one by one.
520 PHONY += $(MAKECMDGOALS) __build_one_by_one
522 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
527 for i in $(MAKECMDGOALS); do \
528 $(MAKE) -f $(srctree)/Makefile $$i; \
532 ifeq ($(config-targets),1)
533 # ===========================================================================
534 # *config targets only - make sure prerequisites are updated, and descend
535 # in scripts/kconfig to make the *config target
537 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
538 # KBUILD_DEFCONFIG may point out an alternative default configuration
539 # used for 'make defconfig'
540 include $(srctree)/arch/$(SRCARCH)/Makefile
541 export KBUILD_DEFCONFIG KBUILD_KCONFIG
543 config: scripts_basic outputmakefile FORCE
544 $(Q)$(MAKE) $(build)=scripts/kconfig $@
546 %config: scripts_basic outputmakefile FORCE
547 $(Q)$(MAKE) $(build)=scripts/kconfig $@
550 # ===========================================================================
551 # Build targets only - this includes vmlinux, arch specific targets, clean
552 # targets and others. In general all targets except *config targets.
554 ifeq ($(KBUILD_EXTMOD),)
555 # Additional helpers built in scripts/
556 # Carefully list dependencies so we do not try to build scripts twice
559 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
561 $(Q)$(MAKE) $(build)=$(@)
563 # Objects we will link into vmlinux / subdirs we need to visit
565 drivers-y := drivers/ sound/ firmware/
569 endif # KBUILD_EXTMOD
571 ifeq ($(dot-config),1)
573 -include include/config/auto.conf
575 ifeq ($(KBUILD_EXTMOD),)
576 # Read in dependencies to all Kconfig* files, make sure to run
577 # oldconfig if changes are detected.
578 -include include/config/auto.conf.cmd
580 # To avoid any implicit rule to kick in, define an empty command
581 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
583 # If .config is newer than include/config/auto.conf, someone tinkered
584 # with it and forgot to run make oldconfig.
585 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
586 # we execute the config step to be sure to catch updated Kconfig files
587 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
588 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
590 # external modules needs include/generated/autoconf.h and include/config/auto.conf
591 # but do not care if they are up-to-date. Use auto.conf to trigger the test
592 PHONY += include/config/auto.conf
594 include/config/auto.conf:
595 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
597 echo >&2 " ERROR: Kernel configuration is invalid."; \
598 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
599 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
603 endif # KBUILD_EXTMOD
606 # Dummy target needed, because used as prerequisite
607 include/config/auto.conf: ;
608 endif # $(dot-config)
610 # The all: target is the default when no target is given on the
612 # This allow a user to issue only 'make' to build a kernel including modules
613 # Defaults to vmlinux, but the arch makefile usually adds further targets
616 include $(srctree)/arch/$(SRCARCH)/Makefile
618 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
620 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
621 KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
626 ifdef CONFIG_READABLE_ASM
627 # Disable optimizations that make assembler listings hard to read.
628 # reorder blocks reorders the control in the function
629 # ipa clone creates specialized cloned functions
630 # partial inlining inlines only parts of functions
631 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
632 $(call cc-option,-fno-ipa-cp-clone,) \
633 $(call cc-option,-fno-partial-inlining)
636 ifneq ($(CONFIG_FRAME_WARN),0)
637 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
640 # Handle stack protector mode.
641 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
642 stackp-flag := -fstack-protector
643 ifeq ($(call cc-option, $(stackp-flag)),)
644 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
645 -fstack-protector not supported by compiler)
648 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
649 stackp-flag := -fstack-protector-strong
650 ifeq ($(call cc-option, $(stackp-flag)),)
651 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
652 -fstack-protector-strong not supported by compiler)
655 # Force off for distro compilers that enable stack protector by default.
656 stackp-flag := $(call cc-option, -fno-stack-protector)
659 KBUILD_CFLAGS += $(stackp-flag)
661 ifeq ($(COMPILER),clang)
662 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
663 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
664 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
665 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
666 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
667 # Quiet clang warning: comparison of unsigned expression < 0 is always false
668 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
669 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
670 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
671 # See modpost pattern 2
672 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
675 # These warnings generated too much noise in a regular build.
676 # Use make W=1 to enable them (see scripts/Makefile.build)
677 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
678 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
681 ifdef CONFIG_FRAME_POINTER
682 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
684 # Some targets (ARM with Thumb2, for example), can't be built with frame
685 # pointers. For those, we don't have FUNCTION_TRACER automatically
686 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
687 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
688 # -fomit-frame-pointer with FUNCTION_TRACER.
689 ifndef CONFIG_FUNCTION_TRACER
690 KBUILD_CFLAGS += -fomit-frame-pointer
694 KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
696 ifdef CONFIG_DEBUG_INFO
698 KBUILD_AFLAGS += -Wa,-gdwarf-2
701 ifdef CONFIG_DEBUG_INFO_REDUCED
702 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
703 $(call cc-option,-fno-var-tracking)
706 ifdef CONFIG_FUNCTION_TRACER
707 ifdef CONFIG_HAVE_FENTRY
708 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
710 KBUILD_CFLAGS += -pg $(CC_USING_FENTRY)
711 KBUILD_AFLAGS += $(CC_USING_FENTRY)
712 ifdef CONFIG_DYNAMIC_FTRACE
713 ifdef CONFIG_HAVE_C_RECORDMCOUNT
714 BUILD_C_RECORDMCOUNT := y
715 export BUILD_C_RECORDMCOUNT
720 # We trigger additional mismatches with less inlining
721 ifdef CONFIG_DEBUG_SECTION_MISMATCH
722 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
725 # arch Makefile may override CC so keep this after arch Makefile is included
726 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
727 CHECKFLAGS += $(NOSTDINC_FLAGS)
729 # warn about C99 declaration after statement
730 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
732 # disable pointer signed / unsigned warnings in gcc 4.0
733 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
735 # disable invalid "can't wrap" optimizations for signed / pointers
736 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
738 # conserve stack if available
739 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
741 # disallow errors like 'EXPORT_GPL(foo);' with missing header
742 KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
744 # require functions to have arguments in prototypes, not empty 'int foo()'
745 KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
747 # Prohibit date/time macros, which would make the build non-deterministic
748 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
750 # use the deterministic mode of AR if available
751 KBUILD_ARFLAGS := $(call ar-option,D)
753 # check for 'asm goto'
754 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
755 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
758 include $(srctree)/scripts/Makefile.extrawarn
760 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
762 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
763 KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
764 KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
766 # Use --build-id when available.
767 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
768 $(call cc-ldoption, -Wl$(comma)--build-id,))
769 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
770 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
772 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
773 LDFLAGS_vmlinux += $(call ld-option, -X,)
776 # Default kernel image to build when no specific target is given.
777 # KBUILD_IMAGE may be overruled on the command line or
778 # set in the environment
779 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
781 export KBUILD_IMAGE ?= vmlinux
784 # INSTALL_PATH specifies where to place the updated kernel and system map
785 # images. Default is /boot, but you can set it to other values
786 export INSTALL_PATH ?= /boot
789 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
790 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
791 # an argument if needed. Otherwise it defaults to the kernel install path
793 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
796 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
797 # relocations required by build roots. This is not defined in the
798 # makefile but the argument can be passed to make if needed.
801 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
805 # INSTALL_MOD_STRIP, if defined, will cause modules to be
806 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
807 # the default option --strip-debug will be used. Otherwise,
808 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
810 ifdef INSTALL_MOD_STRIP
811 ifeq ($(INSTALL_MOD_STRIP),1)
812 mod_strip_cmd = $(STRIP) --strip-debug
814 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
815 endif # INSTALL_MOD_STRIP=1
818 endif # INSTALL_MOD_STRIP
821 # Select initial ramdisk compression format, default is gzip(1).
822 # This shall be used by the dracut(8) tool while creating an initramfs image.
824 INITRD_COMPRESS-y := gzip
825 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
826 INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
827 INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
828 INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
829 INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
830 # do not export INITRD_COMPRESS, since we didn't actually
831 # choose a sane default compression above.
832 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
834 ifdef CONFIG_MODULE_SIG_ALL
835 MODSECKEY = ./signing_key.priv
836 MODPUBKEY = ./signing_key.x509
838 mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
845 ifeq ($(KBUILD_EXTMOD),)
846 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
848 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
849 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
850 $(net-y) $(net-m) $(libs-y) $(libs-m)))
852 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
854 $(core-n) $(core-) $(drivers-n) $(drivers-) \
855 $(net-n) $(net-) $(libs-n) $(libs-))))
857 init-y := $(patsubst %/, %/built-in.o, $(init-y))
858 core-y := $(patsubst %/, %/built-in.o, $(core-y))
859 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
860 net-y := $(patsubst %/, %/built-in.o, $(net-y))
861 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
862 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
863 libs-y := $(libs-y1) $(libs-y2)
865 # Externally visible symbols (used by link-vmlinux.sh)
866 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
867 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
868 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
869 export LDFLAGS_vmlinux
870 # used by scripts/pacmage/Makefile
871 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
873 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
875 # Final link of vmlinux
876 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
877 quiet_cmd_link-vmlinux = LINK $@
879 # Include targets which we want to
880 # execute if the rest of the kernel build went well.
881 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
882 ifdef CONFIG_HEADERS_CHECK
883 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
886 $(Q)$(MAKE) $(build)=samples
888 ifdef CONFIG_BUILD_DOCSRC
889 $(Q)$(MAKE) $(build)=Documentation
891 +$(call if_changed,link-vmlinux)
893 # The actual objects are generated when descending,
894 # make sure no implicit rule kicks in
895 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
897 # Handle descending into subdirectories listed in $(vmlinux-dirs)
898 # Preset locale variables to speed up the build process. Limit locale
899 # tweaks to this spot to avoid wrong language settings when running
900 # make menuconfig etc.
901 # Error messages still appears in the original language
903 PHONY += $(vmlinux-dirs)
904 $(vmlinux-dirs): prepare scripts
905 $(Q)$(MAKE) $(build)=$@
907 define filechk_kernel.release
908 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
911 # Store (new) KERNELRELEASE string in include/config/kernel.release
912 include/config/kernel.release: include/config/auto.conf FORCE
913 $(call filechk,kernel.release)
916 # Things we need to do before we recursively start building the kernel
917 # or the modules are listed in "prepare".
918 # A multi level approach is used. prepareN is processed before prepareN-1.
919 # archprepare is used in arch Makefiles and when processed asm symlink,
920 # version.h and scripts_basic is processed / created.
922 # Listed in dependency order
923 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
925 # prepare3 is used to check if we are building in a separate output directory,
927 # 1) Check that make has not been executed in the kernel src $(srctree)
928 prepare3: include/config/kernel.release
929 ifneq ($(KBUILD_SRC),)
930 @$(kecho) ' Using $(srctree) as source for kernel'
931 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
932 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
933 echo >&2 " in the '$(srctree)' directory.";\
938 # prepare2 creates a makefile if using a separate output directory
939 prepare2: prepare3 outputmakefile asm-generic
941 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
942 include/config/auto.conf
945 archprepare: archheaders archscripts prepare1 scripts_basic
947 prepare0: archprepare FORCE
948 $(Q)$(MAKE) $(build)=.
950 # All the preparing..
953 # Generate some files
954 # ---------------------------------------------------------------------------
956 # KERNELRELEASE can change from a few different places, meaning version.h
957 # needs to be updated, so this check is forced on all builds
960 define filechk_utsrelease.h
961 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
962 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
965 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
968 define filechk_version.h
969 (echo \#define LINUX_VERSION_CODE $(shell \
970 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
971 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
974 $(version_h): $(srctree)/Makefile FORCE
975 $(call filechk,version.h)
977 include/generated/utsrelease.h: include/config/kernel.release FORCE
978 $(call filechk,utsrelease.h)
982 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
983 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
985 # ---------------------------------------------------------------------------
989 @echo '*** Warning: make $@ is unnecessary now.'
991 # ---------------------------------------------------------------------------
993 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
994 export INSTALL_FW_PATH
996 PHONY += firmware_install
997 firmware_install: FORCE
998 @mkdir -p $(objtree)/firmware
999 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1001 # ---------------------------------------------------------------------------
1004 #Default location for installed headers
1005 export INSTALL_HDR_PATH = $(objtree)/usr
1007 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1009 # If we do an all arch process set dst to asm-$(hdr-arch)
1010 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1012 PHONY += archheaders
1015 PHONY += archscripts
1019 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1020 $(Q)$(MAKE) $(build)=scripts build_unifdef
1022 PHONY += headers_install_all
1023 headers_install_all:
1024 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1026 PHONY += headers_install
1027 headers_install: __headers
1028 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1029 $(error Headers not exportable for the $(SRCARCH) architecture))
1030 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1031 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1033 PHONY += headers_check_all
1034 headers_check_all: headers_install_all
1035 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1037 PHONY += headers_check
1038 headers_check: headers_install
1039 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1040 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1042 # ---------------------------------------------------------------------------
1045 ifdef CONFIG_MODULES
1047 # By default, build modules as well
1053 # A module can be listed more than once in obj-m resulting in
1054 # duplicate lines in modules.order files. Those are removed
1055 # using awk while concatenating to the final file.
1058 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1059 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1060 @$(kecho) ' Building modules, stage 2.';
1061 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1062 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1064 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1065 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1067 %/modules.builtin: include/config/auto.conf
1068 $(Q)$(MAKE) $(modbuiltin)=$*
1071 # Target to prepare building external modules
1072 PHONY += modules_prepare
1073 modules_prepare: prepare scripts
1075 # Target to install modules
1076 PHONY += modules_install
1077 modules_install: _modinst_ _modinst_post
1081 @rm -rf $(MODLIB)/kernel
1082 @rm -f $(MODLIB)/source
1083 @mkdir -p $(MODLIB)/kernel
1084 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1085 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1086 rm -f $(MODLIB)/build ; \
1087 ln -s $(CURDIR) $(MODLIB)/build ; \
1089 @cp -f $(objtree)/modules.order $(MODLIB)/
1090 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1091 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1093 # This depmod is only for convenience to give the initial
1094 # boot a modules.dep even before / is mounted read-write. However the
1095 # boot script depmod is the master version.
1096 PHONY += _modinst_post
1097 _modinst_post: _modinst_
1098 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1101 ifeq ($(CONFIG_MODULE_SIG), y)
1102 PHONY += modules_sign
1104 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1107 else # CONFIG_MODULES
1109 # Modules not configured
1110 # ---------------------------------------------------------------------------
1112 modules modules_install: FORCE
1114 @echo >&2 "The present kernel configuration has modules disabled."
1115 @echo >&2 "Type 'make config' and enable loadable module support."
1116 @echo >&2 "Then build a kernel with module support enabled."
1120 endif # CONFIG_MODULES
1123 # Cleaning is done on three levels.
1124 # make clean Delete most generated files
1125 # Leave enough to build external modules
1126 # make mrproper Delete the current configuration, and all generated files
1127 # make distclean Remove editor backup files, patch leftover files and the like
1129 # Directories & files removed with 'make clean'
1130 CLEAN_DIRS += $(MODVERDIR)
1132 # Directories & files removed with 'make mrproper'
1133 MRPROPER_DIRS += include/config usr/include include/generated \
1134 arch/*/include/generated .tmp_objdiff
1135 MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1136 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1137 signing_key.priv signing_key.x509 x509.genkey \
1138 extra_certificates signing_key.x509.keyid \
1139 signing_key.x509.signer include/linux/version.h
1141 # clean - Delete most, but leave enough to build external modules
1143 clean: rm-dirs := $(CLEAN_DIRS)
1144 clean: rm-files := $(CLEAN_FILES)
1145 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1147 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1149 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1152 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1154 clean: archclean vmlinuxclean
1156 # mrproper - Delete all generated files, including .config
1158 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1159 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1160 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1162 PHONY += $(mrproper-dirs) mrproper archmrproper
1164 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1166 mrproper: clean archmrproper $(mrproper-dirs)
1175 @find $(srctree) $(RCS_FIND_IGNORE) \
1176 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1177 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1178 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
1179 -type f -print | xargs rm -f
1182 # Packaging of the kernel to various formats
1183 # ---------------------------------------------------------------------------
1184 # rpm target kept for backward compatibility
1185 package-dir := scripts/package
1188 $(Q)$(MAKE) $(build)=$(package-dir) $@
1189 %pkg: include/config/kernel.release FORCE
1190 $(Q)$(MAKE) $(build)=$(package-dir) $@
1191 rpm: include/config/kernel.release FORCE
1192 $(Q)$(MAKE) $(build)=$(package-dir) $@
1195 # Brief documentation of the typical targets used
1196 # ---------------------------------------------------------------------------
1198 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1199 boards := $(notdir $(boards))
1200 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1201 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1204 @echo 'Cleaning targets:'
1205 @echo ' clean - Remove most generated files but keep the config and'
1206 @echo ' enough build support to build external modules'
1207 @echo ' mrproper - Remove all generated files + config + various backup files'
1208 @echo ' distclean - mrproper + remove editor backup and patch files'
1210 @echo 'Configuration targets:'
1211 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1213 @echo 'Other generic targets:'
1214 @echo ' all - Build all targets marked with [*]'
1215 @echo '* vmlinux - Build the bare kernel'
1216 @echo '* modules - Build all modules'
1217 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1218 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1219 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1220 @echo ' dir/ - Build all files in dir and below'
1221 @echo ' dir/file.[oisS] - Build specified target only'
1222 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1223 @echo ' (requires a recent binutils and recent build (System.map))'
1224 @echo ' dir/file.ko - Build module including final link'
1225 @echo ' modules_prepare - Set up for building external modules'
1226 @echo ' tags/TAGS - Generate tags file for editors'
1227 @echo ' cscope - Generate cscope index'
1228 @echo ' gtags - Generate GNU GLOBAL index'
1229 @echo ' kernelrelease - Output the release version string'
1230 @echo ' kernelversion - Output the version stored in Makefile'
1231 @echo ' image_name - Output the image name'
1232 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1233 echo ' (default: $(INSTALL_HDR_PATH))'; \
1235 @echo 'Static analysers'
1236 @echo ' checkstack - Generate a list of stack hogs'
1237 @echo ' namespacecheck - Name space analysis on compiled kernel'
1238 @echo ' versioncheck - Sanity check on version.h usage'
1239 @echo ' includecheck - Check for duplicate included header files'
1240 @echo ' export_report - List the usages of all exported symbols'
1241 @echo ' headers_check - Sanity check on exported headers'
1242 @echo ' headerdep - Detect inclusion cycles in headers'
1243 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1245 @echo 'Kernel packaging:'
1246 @$(MAKE) $(build)=$(package-dir) help
1248 @echo 'Documentation targets:'
1249 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1251 @echo 'Architecture specific targets ($(SRCARCH)):'
1252 @$(if $(archhelp),$(archhelp),\
1253 echo ' No architecture specific help defined for $(SRCARCH)')
1256 $(foreach b, $(boards), \
1257 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1259 @$(if $(board-dirs), \
1260 $(foreach b, $(board-dirs), \
1261 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1262 printf " %-16s - Show all of the above\\n" help-boards; \
1265 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1266 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1267 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1268 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1269 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1270 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1271 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1272 @echo ' 1: warnings which may be relevant and do not occur too often'
1273 @echo ' 2: warnings which occur quite often but may still be relevant'
1274 @echo ' 3: more obscure warnings, can most likely be ignored'
1275 @echo ' Multiple levels can be combined with W=12 or W=123'
1277 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1278 @echo 'For further info see the ./README file'
1281 help-board-dirs := $(addprefix help-,$(board-dirs))
1283 help-boards: $(help-board-dirs)
1285 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1287 $(help-board-dirs): help-%:
1288 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1289 @$(if $(boards-per-dir), \
1290 $(foreach b, $(boards-per-dir), \
1291 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1295 # Documentation targets
1296 # ---------------------------------------------------------------------------
1297 %docs: scripts_basic FORCE
1298 $(Q)$(MAKE) $(build)=scripts build_docproc
1299 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1301 else # KBUILD_EXTMOD
1304 # External module support.
1305 # When building external modules the kernel used as basis is considered
1306 # read-only, and no consistency checks are made and the make
1307 # system is not used on the basis kernel. If updates are required
1308 # in the basis kernel ordinary make commands (without M=...) must
1311 # The following are the only valid targets when building external
1313 # make M=dir clean Delete all automatically generated files
1314 # make M=dir modules Make all modules in specified dir
1315 # make M=dir Same as 'make M=dir modules'
1316 # make M=dir modules_install
1317 # Install the modules built in the module directory
1318 # Assumes install directory is already created
1320 # We are always building modules
1322 PHONY += crmodverdir
1326 PHONY += $(objtree)/Module.symvers
1327 $(objtree)/Module.symvers:
1328 @test -e $(objtree)/Module.symvers || ( \
1330 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1331 echo " is missing; modules will have no dependencies and modversions."; \
1334 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1335 PHONY += $(module-dirs) modules
1336 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1337 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1339 modules: $(module-dirs)
1340 @$(kecho) ' Building modules, stage 2.';
1341 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1343 PHONY += modules_install
1344 modules_install: _emodinst_ _emodinst_post
1346 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1349 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1350 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1352 PHONY += _emodinst_post
1353 _emodinst_post: _emodinst_
1356 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1358 PHONY += $(clean-dirs) clean
1360 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1362 clean: rm-dirs := $(MODVERDIR)
1363 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1366 @echo ' Building external modules.'
1367 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1369 @echo ' modules - default target, build the module(s)'
1370 @echo ' modules_install - install the module'
1371 @echo ' clean - remove generated files in module directory only'
1375 PHONY += prepare scripts
1378 endif # KBUILD_EXTMOD
1380 clean: $(clean-dirs)
1383 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1384 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1386 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1387 -o -name '*.symtypes' -o -name 'modules.order' \
1388 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1389 -o -name '*.gcno' \) -type f -print | xargs rm -f
1391 # Generate tags for editors
1392 # ---------------------------------------------------------------------------
1393 quiet_cmd_tags = GEN $@
1394 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1396 tags TAGS cscope gtags: FORCE
1399 # Scripts to check various things for consistency
1400 # ---------------------------------------------------------------------------
1402 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1405 find $(srctree)/* $(RCS_FIND_IGNORE) \
1406 -name '*.[hcS]' -type f -print | sort \
1407 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1410 find $(srctree)/* $(RCS_FIND_IGNORE) \
1411 -name '*.[hcS]' -type f -print | sort \
1412 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1415 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1418 $(PERL) $(srctree)/scripts/namespace.pl
1421 $(PERL) $(srctree)/scripts/export_report.pl
1423 endif #ifeq ($(config-targets),1)
1424 endif #ifeq ($(mixed-targets),1)
1426 PHONY += checkstack kernelrelease kernelversion image_name
1428 # UML needs a little special treatment here. It wants to use the host
1429 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1430 # else wants $(ARCH), including people doing cross-builds, which means
1431 # that $(SUBARCH) doesn't work here.
1433 CHECKSTACK_ARCH := $(SUBARCH)
1435 CHECKSTACK_ARCH := $(ARCH)
1438 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1439 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1442 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1445 @echo $(KERNELVERSION)
1448 @echo $(KBUILD_IMAGE)
1450 # Clear a bunch of variables before executing the submake
1452 $(Q)mkdir -p $(objtree)/tools
1453 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1456 $(Q)mkdir -p $(objtree)/tools
1457 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1460 # ---------------------------------------------------------------------------
1461 # Single targets are compatible with:
1462 # - build with mixed source and output
1463 # - build with separate output dir 'make O=...'
1464 # - external modules
1466 # target-dir => where to store outputfile
1467 # build-dir => directory in kernel source tree to use
1469 ifeq ($(KBUILD_EXTMOD),)
1470 build-dir = $(patsubst %/,%,$(dir $@))
1471 target-dir = $(dir $@)
1473 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1474 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1475 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1478 %.s: %.c prepare scripts FORCE
1479 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1480 %.i: %.c prepare scripts FORCE
1481 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1482 %.o: %.c prepare scripts FORCE
1483 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1484 %.lst: %.c prepare scripts FORCE
1485 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1486 %.s: %.S prepare scripts FORCE
1487 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1488 %.o: %.S prepare scripts FORCE
1489 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1490 %.symtypes: %.c prepare scripts FORCE
1491 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1494 /: prepare scripts FORCE
1496 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1497 $(build)=$(build-dir)
1498 %/: prepare scripts FORCE
1500 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1501 $(build)=$(build-dir)
1502 %.ko: prepare scripts FORCE
1504 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1505 $(build)=$(build-dir) $(@:.ko=.o)
1506 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1508 # FIXME Should go into a make.lib or something
1509 # ===========================================================================
1511 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1512 cmd_rmdirs = rm -rf $(rm-dirs)
1514 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1515 cmd_rmfiles = rm -f $(rm-files)
1517 # Run depmod only if we have System.map and depmod is executable
1518 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1519 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1520 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1522 # Create temporary dir for module support files
1523 # clean it up only when building all modules
1524 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1525 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1527 # read all saved command lines
1529 targets := $(wildcard $(sort $(targets)))
1530 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1532 ifneq ($(cmd_files),)
1533 $(cmd_files): ; # Do not try to update included dependency files
1534 include $(cmd_files)
1537 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1539 # $(Q)$(MAKE) $(clean)=dir
1540 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1542 endif # skip-makefile
1547 # Declare the contents of the .PHONY variable as phony. We keep that
1548 # information in a variable so we can use it in if_changed and friends.