5 NAME = Shuffling Zombie Juror
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 # Do not use make's built-in rules and variables
14 # (this increases performance and avoids hard-to-debug behaviour);
17 # Avoid funny character set dependencies
21 export LC_COLLATE LC_NUMERIC
23 # Avoid interference with shell env settings
26 # We are using a recursive build, so we need to do a little thinking
27 # to get the ordering right.
29 # Most importantly: sub-Makefiles should only ever modify files in
30 # their own directory. If in some directory we have a dependency on
31 # a file in another dir (which doesn't happen often, but it's often
32 # unavoidable when linking the built-in.o targets which finally
33 # turn into vmlinux), we will call a sub make in that other dir, and
34 # after that we are sure that everything which is in that other dir
37 # The only cases where we need to modify files which have global
38 # effects are thus separated out and done before the recursive
39 # descending is started. They are now explicitly listed as the
43 # ---------------------------------------------------------------------------
45 # Normally, we echo the whole command before executing it. By making
46 # that echo $($(quiet)$(cmd)), we now have the possibility to set
47 # $(quiet) to choose other forms of output instead, e.g.
49 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
50 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
52 # If $(quiet) is empty, the whole command will be printed.
53 # If it is set to "quiet_", only the short version will be printed.
54 # If it is set to "silent_", nothing will be printed at all, since
55 # the variable $(silent_cmd_cc_o_c) doesn't exist.
57 # A simple variant is to prefix commands with $(Q) - that's useful
58 # for commands that shall be hidden in non-verbose mode.
62 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
63 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
65 # To put more focus on warnings, be less verbose as default
66 # Use 'make V=1' to see the full commands
68 ifeq ("$(origin V)", "command line")
75 ifeq ($(KBUILD_VERBOSE),1)
83 # If the user is running make -s (silent mode), suppress echoing of
86 ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
87 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
91 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
96 export quiet Q KBUILD_VERBOSE
98 # kbuild supports saving output files in a separate directory.
99 # To locate output files in a separate directory two syntaxes are supported.
100 # In both cases the working directory must be the root of the kernel src.
102 # Use "make O=dir/to/store/output/files/"
104 # 2) Set KBUILD_OUTPUT
105 # Set the environment variable KBUILD_OUTPUT to point to the directory
106 # where the output files shall be placed.
107 # export KBUILD_OUTPUT=dir/to/store/output/files/
110 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
113 # KBUILD_SRC is set on invocation of make in OBJ directory
114 # KBUILD_SRC is not intended to be used by the regular user (for now)
115 ifeq ($(KBUILD_SRC),)
117 # OK, Make called in directory where kernel src resides
118 # Do we want to locate output files in a separate directory?
119 ifeq ("$(origin O)", "command line")
120 KBUILD_OUTPUT := $(O)
123 # That's our default target when none is given on the command line
127 # Cancel implicit rules on top Makefile
128 $(CURDIR)/Makefile Makefile: ;
130 ifneq ($(KBUILD_OUTPUT),)
131 # Invoke a second make in the output directory, passing relevant variables
132 # check that the output directory actually exists
133 saved-output := $(KBUILD_OUTPUT)
134 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
136 $(if $(KBUILD_OUTPUT),, \
137 $(error failed to create output directory "$(saved-output)"))
139 PHONY += $(MAKECMDGOALS) sub-make
141 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
145 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
146 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
148 # Leave processing to above invocation of make
150 endif # ifneq ($(KBUILD_OUTPUT),)
151 endif # ifeq ($(KBUILD_SRC),)
153 # We process the rest of the Makefile if this is the final invocation of make
154 ifeq ($(skip-makefile),)
156 # Do not print "Entering directory ...",
157 # but we want to display it when entering to the output directory
158 # so that IDEs/editors are able to understand relative filenames.
159 MAKEFLAGS += --no-print-directory
161 # Call a source code checker (by default, "sparse") as part of the
164 # Use 'make C=1' to enable checking of only re-compiled files.
165 # Use 'make C=2' to enable checking of *all* source files, regardless
166 # of whether they are re-compiled or not.
168 # See the file "Documentation/sparse.txt" for more details, including
169 # where to get the "sparse" utility.
171 ifeq ("$(origin C)", "command line")
172 KBUILD_CHECKSRC = $(C)
174 ifndef KBUILD_CHECKSRC
178 # Use make M=dir to specify directory of external module to build
179 # Old syntax make ... SUBDIRS=$PWD is still supported
180 # Setting the environment variable KBUILD_EXTMOD take precedence
182 KBUILD_EXTMOD ?= $(SUBDIRS)
185 ifeq ("$(origin M)", "command line")
186 KBUILD_EXTMOD := $(M)
189 # If building an external module we do not care about the all: rule
190 # but instead _all depend on modules
192 ifeq ($(KBUILD_EXTMOD),)
198 ifeq ($(KBUILD_SRC),)
199 # building in the source tree
202 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
203 # building in a subdirectory of the source tree
206 srctree := $(KBUILD_SRC)
213 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
215 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
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
339 ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1)
347 # Look for make include files relative to root of kernel src
348 MAKEFLAGS += --include-dir=$(srctree)
350 # We need some generic definitions (do not try to remake the file).
351 $(srctree)/scripts/Kbuild.include: ;
352 include $(srctree)/scripts/Kbuild.include
354 # Make variables (CC, etc...)
355 AS = $(CROSS_COMPILE)as
356 LD = $(CROSS_COMPILE)ld
357 CC = $(CROSS_COMPILE)gcc
359 AR = $(CROSS_COMPILE)ar
360 NM = $(CROSS_COMPILE)nm
361 STRIP = $(CROSS_COMPILE)strip
362 OBJCOPY = $(CROSS_COMPILE)objcopy
363 OBJDUMP = $(CROSS_COMPILE)objdump
365 GENKSYMS = scripts/genksyms/genksyms
366 INSTALLKERNEL := installkernel
367 DEPMOD = /sbin/depmod
372 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
373 -Wbitwise -Wno-return-void $(CF)
379 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
382 # Use USERINCLUDE when you must reference the UAPI directories only.
384 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
385 -Iarch/$(hdr-arch)/include/generated/uapi \
386 -I$(srctree)/include/uapi \
387 -Iinclude/generated/uapi \
388 -include $(srctree)/include/linux/kconfig.h
390 # Use LINUXINCLUDE when you must reference the include/ directory.
391 # Needed to be compatible with the O= option
393 -I$(srctree)/arch/$(hdr-arch)/include \
394 -Iarch/$(hdr-arch)/include/generated \
395 $(if $(KBUILD_SRC), -I$(srctree)/include) \
399 KBUILD_CPPFLAGS := -D__KERNEL__
401 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
402 -fno-strict-aliasing -fno-common \
403 -Werror-implicit-function-declaration \
406 KBUILD_AFLAGS_KERNEL :=
407 KBUILD_CFLAGS_KERNEL :=
408 KBUILD_AFLAGS := -D__ASSEMBLY__
409 KBUILD_AFLAGS_MODULE := -DMODULE
410 KBUILD_CFLAGS_MODULE := -DMODULE
411 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
413 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
414 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
415 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
417 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
418 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
419 export CPP AR NM STRIP OBJCOPY OBJDUMP
420 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
421 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
423 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
424 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
425 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
426 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
427 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
428 export KBUILD_ARFLAGS
430 # When compiling out-of-tree modules, put MODVERDIR in the module
431 # tree rather than in the kernel tree. The kernel tree might
433 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
435 # Files to ignore in find ... statements
437 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
438 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
440 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
441 --exclude CVS --exclude .pc --exclude .hg --exclude .git
443 # ===========================================================================
444 # Rules shared between *config targets and build targets
446 # Basic helpers built in scripts/
447 PHONY += scripts_basic
449 $(Q)$(MAKE) $(build)=scripts/basic
450 $(Q)rm -f .tmp_quiet_recordmcount
452 # To avoid any implicit rule to kick in, define an empty command.
453 scripts/basic/%: scripts_basic ;
455 PHONY += outputmakefile
456 # outputmakefile generates a Makefile in the output directory, if using a
457 # separate output directory. This allows convenient use of make in the
460 ifneq ($(KBUILD_SRC),)
461 $(Q)ln -fsn $(srctree) source
462 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
463 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
466 # Support for using generic headers in asm-generic
469 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
470 src=asm obj=arch/$(SRCARCH)/include/generated/asm
471 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
472 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
474 # To make sure we do not include .config for any of the *config targets
475 # catch them early, and hand them over to scripts/kconfig/Makefile
476 # It is allowed to specify more targets when calling make, including
477 # mixing *config targets and build targets.
478 # For example 'make oldconfig all'.
479 # Detect when mixed targets is specified, and make a second invocation
480 # of make so .config is not included in this case either (for *config).
482 version_h := include/generated/uapi/linux/version.h
484 no-dot-config-targets := clean mrproper distclean \
485 cscope gtags TAGS tags help %docs check% coccicheck \
486 $(version_h) headers_% archheaders archscripts \
487 kernelversion %src-pkg
493 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
494 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
499 ifeq ($(KBUILD_EXTMOD),)
500 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
502 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
508 ifeq ($(mixed-targets),1)
509 # ===========================================================================
510 # We're called with mixed targets (*config and build targets).
511 # Handle them one by one.
513 PHONY += $(MAKECMDGOALS) __build_one_by_one
515 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
520 for i in $(MAKECMDGOALS); do \
521 $(MAKE) -f $(srctree)/Makefile $$i; \
525 ifeq ($(config-targets),1)
526 # ===========================================================================
527 # *config targets only - make sure prerequisites are updated, and descend
528 # in scripts/kconfig to make the *config target
530 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
531 # KBUILD_DEFCONFIG may point out an alternative default configuration
532 # used for 'make defconfig'
533 include $(srctree)/arch/$(SRCARCH)/Makefile
534 export KBUILD_DEFCONFIG KBUILD_KCONFIG
536 config: scripts_basic outputmakefile FORCE
537 $(Q)$(MAKE) $(build)=scripts/kconfig $@
539 %config: scripts_basic outputmakefile FORCE
540 $(Q)$(MAKE) $(build)=scripts/kconfig $@
543 # ===========================================================================
544 # Build targets only - this includes vmlinux, arch specific targets, clean
545 # targets and others. In general all targets except *config targets.
547 ifeq ($(KBUILD_EXTMOD),)
548 # Additional helpers built in scripts/
549 # Carefully list dependencies so we do not try to build scripts twice
552 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
554 $(Q)$(MAKE) $(build)=$(@)
556 # Objects we will link into vmlinux / subdirs we need to visit
558 drivers-y := drivers/ sound/ firmware/
562 endif # KBUILD_EXTMOD
564 ifeq ($(dot-config),1)
566 -include include/config/auto.conf
568 ifeq ($(KBUILD_EXTMOD),)
569 # Read in dependencies to all Kconfig* files, make sure to run
570 # oldconfig if changes are detected.
571 -include include/config/auto.conf.cmd
573 # To avoid any implicit rule to kick in, define an empty command
574 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
576 # If .config is newer than include/config/auto.conf, someone tinkered
577 # with it and forgot to run make oldconfig.
578 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
579 # we execute the config step to be sure to catch updated Kconfig files
580 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
581 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
583 # external modules needs include/generated/autoconf.h and include/config/auto.conf
584 # but do not care if they are up-to-date. Use auto.conf to trigger the test
585 PHONY += include/config/auto.conf
587 include/config/auto.conf:
588 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
590 echo >&2 " ERROR: Kernel configuration is invalid."; \
591 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
592 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
596 endif # KBUILD_EXTMOD
599 # Dummy target needed, because used as prerequisite
600 include/config/auto.conf: ;
601 endif # $(dot-config)
603 # The all: target is the default when no target is given on the
605 # This allow a user to issue only 'make' to build a kernel including modules
606 # Defaults to vmlinux, but the arch makefile usually adds further targets
609 include $(srctree)/arch/$(SRCARCH)/Makefile
611 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
613 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
614 KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
619 # Tell gcc to never replace conditional load with a non-conditional one
620 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
622 ifdef CONFIG_READABLE_ASM
623 # Disable optimizations that make assembler listings hard to read.
624 # reorder blocks reorders the control in the function
625 # ipa clone creates specialized cloned functions
626 # partial inlining inlines only parts of functions
627 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
628 $(call cc-option,-fno-ipa-cp-clone,) \
629 $(call cc-option,-fno-partial-inlining)
632 ifneq ($(CONFIG_FRAME_WARN),0)
633 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
636 # Handle stack protector mode.
638 # Since kbuild can potentially perform two passes (first with the old
639 # .config values and then with updated .config values), we cannot error out
640 # if a desired compiler option is unsupported. If we were to error, kbuild
641 # could never get to the second pass and actually notice that we changed
642 # the option to something that was supported.
644 # Additionally, we don't want to fallback and/or silently change which compiler
645 # flags will be used, since that leads to producing kernels with different
646 # security feature characteristics depending on the compiler used. ("But I
647 # selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
649 # The middle ground is to warn here so that the failed option is obvious, but
650 # to let the build fail with bad compiler flags so that we can't produce a
651 # kernel when there is a CONFIG and compiler mismatch.
653 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
654 stackp-flag := -fstack-protector
655 ifeq ($(call cc-option, $(stackp-flag)),)
656 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
657 -fstack-protector not supported by compiler)
660 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
661 stackp-flag := -fstack-protector-strong
662 ifeq ($(call cc-option, $(stackp-flag)),)
663 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
664 -fstack-protector-strong not supported by compiler)
667 # Force off for distro compilers that enable stack protector by default.
668 stackp-flag := $(call cc-option, -fno-stack-protector)
671 KBUILD_CFLAGS += $(stackp-flag)
673 ifeq ($(COMPILER),clang)
674 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
675 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
676 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
677 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
678 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
679 # Quiet clang warning: comparison of unsigned expression < 0 is always false
680 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
681 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
682 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
683 # See modpost pattern 2
684 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
685 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
688 # This warning generated too much noise in a regular build.
689 # Use make W=1 to enable this warning (see scripts/Makefile.build)
690 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
693 ifdef CONFIG_FRAME_POINTER
694 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
696 # Some targets (ARM with Thumb2, for example), can't be built with frame
697 # pointers. For those, we don't have FUNCTION_TRACER automatically
698 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
699 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
700 # -fomit-frame-pointer with FUNCTION_TRACER.
701 ifndef CONFIG_FUNCTION_TRACER
702 KBUILD_CFLAGS += -fomit-frame-pointer
706 KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
708 ifdef CONFIG_DEBUG_INFO
709 ifdef CONFIG_DEBUG_INFO_SPLIT
710 KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
714 KBUILD_AFLAGS += -Wa,-gdwarf-2
716 ifdef CONFIG_DEBUG_INFO_DWARF4
717 KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
720 ifdef CONFIG_DEBUG_INFO_REDUCED
721 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
722 $(call cc-option,-fno-var-tracking)
725 ifdef CONFIG_FUNCTION_TRACER
726 ifdef CONFIG_HAVE_FENTRY
727 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
729 KBUILD_CFLAGS += -pg $(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
777 include $(srctree)/scripts/Makefile.extrawarn
779 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
780 KBUILD_CPPFLAGS += $(KCPPFLAGS)
781 KBUILD_AFLAGS += $(KAFLAGS)
782 KBUILD_CFLAGS += $(KCFLAGS)
784 # Use --build-id when available.
785 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
786 $(call cc-ldoption, -Wl$(comma)--build-id,))
787 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
788 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
790 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
791 LDFLAGS_vmlinux += $(call ld-option, -X,)
794 # Default kernel image to build when no specific target is given.
795 # KBUILD_IMAGE may be overruled on the command line or
796 # set in the environment
797 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
799 export KBUILD_IMAGE ?= vmlinux
802 # INSTALL_PATH specifies where to place the updated kernel and system map
803 # images. Default is /boot, but you can set it to other values
804 export INSTALL_PATH ?= /boot
807 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
808 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
809 # an argument if needed. Otherwise it defaults to the kernel install path
811 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
814 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
815 # relocations required by build roots. This is not defined in the
816 # makefile but the argument can be passed to make if needed.
819 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
823 # INSTALL_MOD_STRIP, if defined, will cause modules to be
824 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
825 # the default option --strip-debug will be used. Otherwise,
826 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
828 ifdef INSTALL_MOD_STRIP
829 ifeq ($(INSTALL_MOD_STRIP),1)
830 mod_strip_cmd = $(STRIP) --strip-debug
832 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
833 endif # INSTALL_MOD_STRIP=1
836 endif # INSTALL_MOD_STRIP
839 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
840 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
841 # or CONFIG_MODULE_COMPRESS_XZ.
843 mod_compress_cmd = true
844 ifdef CONFIG_MODULE_COMPRESS
845 ifdef CONFIG_MODULE_COMPRESS_GZIP
846 mod_compress_cmd = gzip -n
847 endif # CONFIG_MODULE_COMPRESS_GZIP
848 ifdef CONFIG_MODULE_COMPRESS_XZ
849 mod_compress_cmd = xz
850 endif # CONFIG_MODULE_COMPRESS_XZ
851 endif # CONFIG_MODULE_COMPRESS
852 export mod_compress_cmd
854 # Select initial ramdisk compression format, default is gzip(1).
855 # This shall be used by the dracut(8) tool while creating an initramfs image.
857 INITRD_COMPRESS-y := gzip
858 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
859 INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
860 INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
861 INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
862 INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
863 # do not export INITRD_COMPRESS, since we didn't actually
864 # choose a sane default compression above.
865 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
867 ifdef CONFIG_MODULE_SIG_ALL
868 MODSECKEY = ./signing_key.priv
869 MODPUBKEY = ./signing_key.x509
871 mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
878 ifeq ($(KBUILD_EXTMOD),)
879 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
881 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
882 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
883 $(net-y) $(net-m) $(libs-y) $(libs-m)))
885 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
886 $(init-) $(core-) $(drivers-) $(net-) $(libs-))))
888 init-y := $(patsubst %/, %/built-in.o, $(init-y))
889 core-y := $(patsubst %/, %/built-in.o, $(core-y))
890 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
891 net-y := $(patsubst %/, %/built-in.o, $(net-y))
892 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
893 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
894 libs-y := $(libs-y1) $(libs-y2)
896 # Externally visible symbols (used by link-vmlinux.sh)
897 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
898 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
899 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
900 export LDFLAGS_vmlinux
901 # used by scripts/pacmage/Makefile
902 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
904 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
906 # Final link of vmlinux
907 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
908 quiet_cmd_link-vmlinux = LINK $@
910 # Include targets which we want to
911 # execute if the rest of the kernel build went well.
912 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
913 ifdef CONFIG_HEADERS_CHECK
914 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
917 $(Q)$(MAKE) $(build)=samples
919 ifdef CONFIG_BUILD_DOCSRC
920 $(Q)$(MAKE) $(build)=Documentation
922 +$(call if_changed,link-vmlinux)
924 # The actual objects are generated when descending,
925 # make sure no implicit rule kicks in
926 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
928 # Handle descending into subdirectories listed in $(vmlinux-dirs)
929 # Preset locale variables to speed up the build process. Limit locale
930 # tweaks to this spot to avoid wrong language settings when running
931 # make menuconfig etc.
932 # Error messages still appears in the original language
934 PHONY += $(vmlinux-dirs)
935 $(vmlinux-dirs): prepare scripts
936 $(Q)$(MAKE) $(build)=$@
938 define filechk_kernel.release
939 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
942 # Store (new) KERNELRELEASE string in include/config/kernel.release
943 include/config/kernel.release: include/config/auto.conf FORCE
944 $(call filechk,kernel.release)
947 # Things we need to do before we recursively start building the kernel
948 # or the modules are listed in "prepare".
949 # A multi level approach is used. prepareN is processed before prepareN-1.
950 # archprepare is used in arch Makefiles and when processed asm symlink,
951 # version.h and scripts_basic is processed / created.
953 # Listed in dependency order
954 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
956 # prepare3 is used to check if we are building in a separate output directory,
958 # 1) Check that make has not been executed in the kernel src $(srctree)
959 prepare3: include/config/kernel.release
960 ifneq ($(KBUILD_SRC),)
961 @$(kecho) ' Using $(srctree) as source for kernel'
962 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
963 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
964 echo >&2 " in the '$(srctree)' directory.";\
969 # prepare2 creates a makefile if using a separate output directory
970 prepare2: prepare3 outputmakefile asm-generic
972 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
973 include/config/auto.conf
976 archprepare: archheaders archscripts prepare1 scripts_basic
978 prepare0: archprepare FORCE
979 $(Q)$(MAKE) $(build)=.
981 # All the preparing..
984 # Generate some files
985 # ---------------------------------------------------------------------------
987 # KERNELRELEASE can change from a few different places, meaning version.h
988 # needs to be updated, so this check is forced on all builds
991 define filechk_utsrelease.h
992 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
993 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
996 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
999 define filechk_version.h
1000 (echo \#define LINUX_VERSION_CODE $(shell \
1001 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1002 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1005 $(version_h): $(srctree)/Makefile FORCE
1006 $(call filechk,version.h)
1008 include/generated/utsrelease.h: include/config/kernel.release FORCE
1009 $(call filechk,utsrelease.h)
1013 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1014 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1016 # ---------------------------------------------------------------------------
1020 @echo '*** Warning: make $@ is unnecessary now.'
1022 # ---------------------------------------------------------------------------
1024 INSTALL_FW_PATH=$(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 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1040 # If we do an all arch process set dst to asm-$(hdr-arch)
1041 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1043 PHONY += archheaders
1046 PHONY += archscripts
1050 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1051 $(Q)$(MAKE) $(build)=scripts build_unifdef
1053 PHONY += headers_install_all
1054 headers_install_all:
1055 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1057 PHONY += headers_install
1058 headers_install: __headers
1059 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1060 $(error Headers not exportable for the $(SRCARCH) architecture))
1061 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1062 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1064 PHONY += headers_check_all
1065 headers_check_all: headers_install_all
1066 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1068 PHONY += headers_check
1069 headers_check: headers_install
1070 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1071 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1073 # ---------------------------------------------------------------------------
1078 $(Q)$(MAKE) -C tools/testing/selftests run_tests
1080 # ---------------------------------------------------------------------------
1083 ifdef CONFIG_MODULES
1085 # By default, build modules as well
1091 # A module can be listed more than once in obj-m resulting in
1092 # duplicate lines in modules.order files. Those are removed
1093 # using awk while concatenating to the final file.
1096 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1097 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1098 @$(kecho) ' Building modules, stage 2.';
1099 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1100 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1102 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1103 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1105 %/modules.builtin: include/config/auto.conf
1106 $(Q)$(MAKE) $(modbuiltin)=$*
1109 # Target to prepare building external modules
1110 PHONY += modules_prepare
1111 modules_prepare: prepare scripts
1113 # Target to install modules
1114 PHONY += modules_install
1115 modules_install: _modinst_ _modinst_post
1119 @rm -rf $(MODLIB)/kernel
1120 @rm -f $(MODLIB)/source
1121 @mkdir -p $(MODLIB)/kernel
1122 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1123 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1124 rm -f $(MODLIB)/build ; \
1125 ln -s $(CURDIR) $(MODLIB)/build ; \
1127 @cp -f $(objtree)/modules.order $(MODLIB)/
1128 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1129 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1131 # This depmod is only for convenience to give the initial
1132 # boot a modules.dep even before / is mounted read-write. However the
1133 # boot script depmod is the master version.
1134 PHONY += _modinst_post
1135 _modinst_post: _modinst_
1136 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1139 ifeq ($(CONFIG_MODULE_SIG), y)
1140 PHONY += modules_sign
1142 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1145 else # CONFIG_MODULES
1147 # Modules not configured
1148 # ---------------------------------------------------------------------------
1150 modules modules_install: FORCE
1152 @echo >&2 "The present kernel configuration has modules disabled."
1153 @echo >&2 "Type 'make config' and enable loadable module support."
1154 @echo >&2 "Then build a kernel with module support enabled."
1158 endif # CONFIG_MODULES
1161 # Cleaning is done on three levels.
1162 # make clean Delete most generated files
1163 # Leave enough to build external modules
1164 # make mrproper Delete the current configuration, and all generated files
1165 # make distclean Remove editor backup files, patch leftover files and the like
1167 # Directories & files removed with 'make clean'
1168 CLEAN_DIRS += $(MODVERDIR)
1170 # Directories & files removed with 'make mrproper'
1171 MRPROPER_DIRS += include/config usr/include include/generated \
1172 arch/*/include/generated .tmp_objdiff
1173 MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1174 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1175 signing_key.priv signing_key.x509 x509.genkey \
1176 extra_certificates signing_key.x509.keyid \
1177 signing_key.x509.signer include/linux/version.h
1179 # clean - Delete most, but leave enough to build external modules
1181 clean: rm-dirs := $(CLEAN_DIRS)
1182 clean: rm-files := $(CLEAN_FILES)
1183 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1185 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1187 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1190 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1192 clean: archclean vmlinuxclean
1194 # mrproper - Delete all generated files, including .config
1196 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1197 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1198 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1200 PHONY += $(mrproper-dirs) mrproper archmrproper
1202 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1204 mrproper: clean archmrproper $(mrproper-dirs)
1213 @find $(srctree) $(RCS_FIND_IGNORE) \
1214 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1215 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1216 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
1217 -type f -print | xargs rm -f
1220 # Packaging of the kernel to various formats
1221 # ---------------------------------------------------------------------------
1222 # rpm target kept for backward compatibility
1223 package-dir := scripts/package
1226 $(Q)$(MAKE) $(build)=$(package-dir) $@
1227 %pkg: include/config/kernel.release FORCE
1228 $(Q)$(MAKE) $(build)=$(package-dir) $@
1229 rpm: include/config/kernel.release FORCE
1230 $(Q)$(MAKE) $(build)=$(package-dir) $@
1233 # Brief documentation of the typical targets used
1234 # ---------------------------------------------------------------------------
1236 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1237 boards := $(notdir $(boards))
1238 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1239 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1242 @echo 'Cleaning targets:'
1243 @echo ' clean - Remove most generated files but keep the config and'
1244 @echo ' enough build support to build external modules'
1245 @echo ' mrproper - Remove all generated files + config + various backup files'
1246 @echo ' distclean - mrproper + remove editor backup and patch files'
1248 @echo 'Configuration targets:'
1249 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1251 @echo 'Other generic targets:'
1252 @echo ' all - Build all targets marked with [*]'
1253 @echo '* vmlinux - Build the bare kernel'
1254 @echo '* modules - Build all modules'
1255 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1256 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1257 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1258 @echo ' dir/ - Build all files in dir and below'
1259 @echo ' dir/file.[oisS] - Build specified target only'
1260 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1261 @echo ' (requires a recent binutils and recent build (System.map))'
1262 @echo ' dir/file.ko - Build module including final link'
1263 @echo ' modules_prepare - Set up for building external modules'
1264 @echo ' tags/TAGS - Generate tags file for editors'
1265 @echo ' cscope - Generate cscope index'
1266 @echo ' gtags - Generate GNU GLOBAL index'
1267 @echo ' kernelrelease - Output the release version string (use with make -s)'
1268 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1269 @echo ' image_name - Output the image name (use with make -s)'
1270 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1271 echo ' (default: $(INSTALL_HDR_PATH))'; \
1273 @echo 'Static analysers'
1274 @echo ' checkstack - Generate a list of stack hogs'
1275 @echo ' namespacecheck - Name space analysis on compiled kernel'
1276 @echo ' versioncheck - Sanity check on version.h usage'
1277 @echo ' includecheck - Check for duplicate included header files'
1278 @echo ' export_report - List the usages of all exported symbols'
1279 @echo ' headers_check - Sanity check on exported headers'
1280 @echo ' headerdep - Detect inclusion cycles in headers'
1281 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1283 @echo 'Kernel selftest'
1284 @echo ' kselftest - Build and run kernel selftest (run as root)'
1285 @echo ' Build, install, and boot kernel before'
1286 @echo ' running kselftest on it'
1288 @echo 'Kernel packaging:'
1289 @$(MAKE) $(build)=$(package-dir) help
1291 @echo 'Documentation targets:'
1292 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1294 @echo 'Architecture specific targets ($(SRCARCH)):'
1295 @$(if $(archhelp),$(archhelp),\
1296 echo ' No architecture specific help defined for $(SRCARCH)')
1299 $(foreach b, $(boards), \
1300 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1302 @$(if $(board-dirs), \
1303 $(foreach b, $(board-dirs), \
1304 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1305 printf " %-16s - Show all of the above\\n" help-boards; \
1308 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1309 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1310 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1311 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1312 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1313 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1314 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1315 @echo ' 1: warnings which may be relevant and do not occur too often'
1316 @echo ' 2: warnings which occur quite often but may still be relevant'
1317 @echo ' 3: more obscure warnings, can most likely be ignored'
1318 @echo ' Multiple levels can be combined with W=12 or W=123'
1320 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1321 @echo 'For further info see the ./README file'
1324 help-board-dirs := $(addprefix help-,$(board-dirs))
1326 help-boards: $(help-board-dirs)
1328 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1330 $(help-board-dirs): help-%:
1331 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1332 @$(if $(boards-per-dir), \
1333 $(foreach b, $(boards-per-dir), \
1334 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1338 # Documentation targets
1339 # ---------------------------------------------------------------------------
1340 %docs: scripts_basic FORCE
1341 $(Q)$(MAKE) $(build)=scripts build_docproc
1342 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1344 else # KBUILD_EXTMOD
1347 # External module support.
1348 # When building external modules the kernel used as basis is considered
1349 # read-only, and no consistency checks are made and the make
1350 # system is not used on the basis kernel. If updates are required
1351 # in the basis kernel ordinary make commands (without M=...) must
1354 # The following are the only valid targets when building external
1356 # make M=dir clean Delete all automatically generated files
1357 # make M=dir modules Make all modules in specified dir
1358 # make M=dir Same as 'make M=dir modules'
1359 # make M=dir modules_install
1360 # Install the modules built in the module directory
1361 # Assumes install directory is already created
1363 # We are always building modules
1365 PHONY += crmodverdir
1369 PHONY += $(objtree)/Module.symvers
1370 $(objtree)/Module.symvers:
1371 @test -e $(objtree)/Module.symvers || ( \
1373 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1374 echo " is missing; modules will have no dependencies and modversions."; \
1377 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1378 PHONY += $(module-dirs) modules
1379 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1380 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1382 modules: $(module-dirs)
1383 @$(kecho) ' Building modules, stage 2.';
1384 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1386 PHONY += modules_install
1387 modules_install: _emodinst_ _emodinst_post
1389 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1392 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1393 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1395 PHONY += _emodinst_post
1396 _emodinst_post: _emodinst_
1399 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1401 PHONY += $(clean-dirs) clean
1403 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1405 clean: rm-dirs := $(MODVERDIR)
1406 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1409 @echo ' Building external modules.'
1410 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1412 @echo ' modules - default target, build the module(s)'
1413 @echo ' modules_install - install the module'
1414 @echo ' clean - remove generated files in module directory only'
1418 PHONY += prepare scripts
1421 endif # KBUILD_EXTMOD
1423 clean: $(clean-dirs)
1426 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1427 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1430 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1431 -o -name '*.symtypes' -o -name 'modules.order' \
1432 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1433 -o -name '*.gcno' \) -type f -print | xargs rm -f
1435 # Generate tags for editors
1436 # ---------------------------------------------------------------------------
1437 quiet_cmd_tags = GEN $@
1438 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1440 tags TAGS cscope gtags: FORCE
1443 # Scripts to check various things for consistency
1444 # ---------------------------------------------------------------------------
1446 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1449 find $(srctree)/* $(RCS_FIND_IGNORE) \
1450 -name '*.[hcS]' -type f -print | sort \
1451 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1454 find $(srctree)/* $(RCS_FIND_IGNORE) \
1455 -name '*.[hcS]' -type f -print | sort \
1456 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1459 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1462 $(PERL) $(srctree)/scripts/namespace.pl
1465 $(PERL) $(srctree)/scripts/export_report.pl
1467 endif #ifeq ($(config-targets),1)
1468 endif #ifeq ($(mixed-targets),1)
1470 PHONY += checkstack kernelrelease kernelversion image_name
1472 # UML needs a little special treatment here. It wants to use the host
1473 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1474 # else wants $(ARCH), including people doing cross-builds, which means
1475 # that $(SUBARCH) doesn't work here.
1477 CHECKSTACK_ARCH := $(SUBARCH)
1479 CHECKSTACK_ARCH := $(ARCH)
1482 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1483 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1486 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1489 @echo $(KERNELVERSION)
1492 @echo $(KBUILD_IMAGE)
1494 # Clear a bunch of variables before executing the submake
1496 $(Q)mkdir -p $(objtree)/tools
1497 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1500 $(Q)mkdir -p $(objtree)/tools
1501 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1504 # ---------------------------------------------------------------------------
1505 # Single targets are compatible with:
1506 # - build with mixed source and output
1507 # - build with separate output dir 'make O=...'
1508 # - external modules
1510 # target-dir => where to store outputfile
1511 # build-dir => directory in kernel source tree to use
1513 ifeq ($(KBUILD_EXTMOD),)
1514 build-dir = $(patsubst %/,%,$(dir $@))
1515 target-dir = $(dir $@)
1517 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1518 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1519 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1522 %.s: %.c prepare scripts FORCE
1523 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1524 %.i: %.c prepare scripts FORCE
1525 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1526 %.o: %.c prepare scripts FORCE
1527 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1528 %.lst: %.c prepare scripts FORCE
1529 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1530 %.s: %.S prepare scripts FORCE
1531 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1532 %.o: %.S prepare scripts FORCE
1533 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1534 %.symtypes: %.c prepare scripts FORCE
1535 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1538 /: prepare scripts FORCE
1540 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1541 $(build)=$(build-dir)
1542 # Make sure the latest headers are built for Documentation
1543 Documentation/: headers_install
1544 %/: prepare scripts FORCE
1546 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1547 $(build)=$(build-dir)
1548 %.ko: prepare scripts FORCE
1550 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1551 $(build)=$(build-dir) $(@:.ko=.o)
1552 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1554 # FIXME Should go into a make.lib or something
1555 # ===========================================================================
1557 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1558 cmd_rmdirs = rm -rf $(rm-dirs)
1560 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1561 cmd_rmfiles = rm -f $(rm-files)
1563 # Run depmod only if we have System.map and depmod is executable
1564 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1565 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1566 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1568 # Create temporary dir for module support files
1569 # clean it up only when building all modules
1570 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1571 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1573 # read all saved command lines
1575 targets := $(wildcard $(sort $(targets)))
1576 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1578 ifneq ($(cmd_files),)
1579 $(cmd_files): ; # Do not try to update included dependency files
1580 include $(cmd_files)
1583 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1585 # $(Q)$(MAKE) $(clean)=dir
1586 clean := -f $(srctree)/scripts/Makefile.clean obj
1588 endif # skip-makefile
1593 # Declare the contents of the .PHONY variable as phony. We keep that
1594 # information in a variable so we can use it in if_changed and friends.