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 # That's our default target when none is given on the command line
17 # o Do not use make's built-in rules and variables
18 # (this increases performance and avoids hard-to-debug behaviour);
19 # o Look for make include files relative to root of kernel src
20 MAKEFLAGS
+= -rR
--include-dir
=$(CURDIR
)
22 # Avoid funny character set dependencies
26 export LC_COLLATE LC_NUMERIC
28 # Avoid interference with shell env settings
31 # We are using a recursive build, so we need to do a little thinking
32 # to get the ordering right.
34 # Most importantly: sub-Makefiles should only ever modify files in
35 # their own directory. If in some directory we have a dependency on
36 # a file in another dir (which doesn't happen often, but it's often
37 # unavoidable when linking the built-in.o targets which finally
38 # turn into vmlinux), we will call a sub make in that other dir, and
39 # after that we are sure that everything which is in that other dir
42 # The only cases where we need to modify files which have global
43 # effects are thus separated out and done before the recursive
44 # descending is started. They are now explicitly listed as the
48 # ---------------------------------------------------------------------------
50 # Normally, we echo the whole command before executing it. By making
51 # that echo $($(quiet)$(cmd)), we now have the possibility to set
52 # $(quiet) to choose other forms of output instead, e.g.
54 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
55 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
57 # If $(quiet) is empty, the whole command will be printed.
58 # If it is set to "quiet_", only the short version will be printed.
59 # If it is set to "silent_", nothing will be printed at all, since
60 # the variable $(silent_cmd_cc_o_c) doesn't exist.
62 # A simple variant is to prefix commands with $(Q) - that's useful
63 # for commands that shall be hidden in non-verbose mode.
67 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
68 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
70 # To put more focus on warnings, be less verbose as default
71 # Use 'make V=1' to see the full commands
73 ifeq ("$(origin V)", "command line")
80 ifeq ($(KBUILD_VERBOSE
),1)
88 # If the user is running make -s (silent mode), suppress echoing of
91 ifneq ($(findstring s
,$(filter-out --%,$(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 not intended to be used by the regular user (for now),
114 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
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 # Cancel implicit rules on top Makefile
124 $(CURDIR
)/Makefile Makefile
: ;
126 ifneq ($(words $(subst :, ,$(CURDIR
))), 1)
127 $(error main directory cannot contain spaces nor colons
)
130 ifneq ($(KBUILD_OUTPUT
),)
131 # check that the output directory actually exists
132 saved-output
:= $(KBUILD_OUTPUT
)
133 $(shell [ -d
$(KBUILD_OUTPUT
) ] || mkdir
-p
$(KBUILD_OUTPUT
))
134 KBUILD_OUTPUT
:= $(realpath
$(KBUILD_OUTPUT
))
135 $(if
$(KBUILD_OUTPUT
),, \
136 $(error failed to create output directory
"$(saved-output)"))
138 PHONY
+= $(MAKECMDGOALS
) sub-make
140 $(filter-out _all sub-make
$(CURDIR
)/Makefile
, $(MAKECMDGOALS
)) _all
: sub-make
143 # Invoke a second make in the output directory, passing relevant variables
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 ($(skip-makefile
),)
156 # Do not print "Entering directory ...",
157 # but we want to display it when entering to the output directory
158 # so that IDEs/editors are able to understand relative filenames.
159 MAKEFLAGS
+= --no-print-directory
161 # Call a source code checker (by default, "sparse") as part of the
164 # Use 'make C=1' to enable checking of only re-compiled files.
165 # Use 'make C=2' to enable checking of *all* source files, regardless
166 # of whether they are re-compiled or not.
168 # See the file "Documentation/dev-tools/sparse.rst" for more details,
169 # including where to get the "sparse" utility.
171 ifeq ("$(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
:= $(M
)
189 ifeq ($(KBUILD_SRC
),)
190 # building in the source tree
193 ifeq ($(KBUILD_SRC
)/,$(dir $(CURDIR
)))
194 # building in a subdirectory of the source tree
197 srctree
:= $(KBUILD_SRC
)
201 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
207 VPATH
:= $(srctree
)$(if
$(KBUILD_EXTMOD
),:$(KBUILD_EXTMOD
))
209 export srctree objtree VPATH
211 # To make sure we do not include .config for any of the *config targets
212 # catch them early, and hand them over to scripts/kconfig/Makefile
213 # It is allowed to specify more targets when calling make, including
214 # mixing *config targets and build targets.
215 # For example 'make oldconfig all'.
216 # Detect when mixed targets is specified, and make a second invocation
217 # of make so .config is not included in this case either (for *config).
219 version_h
:= include/generated
/uapi
/linux
/version.h
220 old_version_h
:= include/linux
/version.h
222 no-dot-config-targets
:= clean mrproper
distclean \
223 cscope gtags TAGS
tags help
% %docs
check% coccicheck \
224 $(version_h
) headers_
% archheaders archscripts \
225 kernelversion
%src-pkg
231 ifneq ($(filter $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
232 ifeq ($(filter-out $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
237 ifeq ($(KBUILD_EXTMOD
),)
238 ifneq ($(filter config
%config
,$(MAKECMDGOALS
)),)
240 ifneq ($(words $(MAKECMDGOALS
)),1)
245 # install and modules_install need also be processed one by one
246 ifneq ($(filter install,$(MAKECMDGOALS
)),)
247 ifneq ($(filter modules_install
,$(MAKECMDGOALS
)),)
252 ifeq ($(mixed-targets
),1)
253 # ===========================================================================
254 # We're called with mixed targets (*config and build targets).
255 # Handle them one by one.
257 PHONY
+= $(MAKECMDGOALS
) __build_one_by_one
259 $(filter-out __build_one_by_one
, $(MAKECMDGOALS
)): __build_one_by_one
264 for i in
$(MAKECMDGOALS
); do \
265 $(MAKE
) -f
$(srctree
)/Makefile
$$i; \
270 # We need some generic definitions (do not try to remake the file).
271 scripts
/Kbuild.
include: ;
272 include scripts
/Kbuild.
include
274 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
275 KERNELRELEASE
= $(shell cat
include/config
/kernel.release
2> /dev
/null
)
276 KERNELVERSION
= $(VERSION
)$(if
$(PATCHLEVEL
),.
$(PATCHLEVEL
)$(if
$(SUBLEVEL
),.
$(SUBLEVEL
)))$(EXTRAVERSION
)
277 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
279 # SUBARCH tells the usermode build what the underlying arch is. That is set
280 # first, and if a usermode build is happening, the "ARCH=um" on the command
281 # line overrides the setting of ARCH below. If a native build is happening,
282 # then ARCH is assigned, getting whatever value it gets normally, and
283 # SUBARCH is subsequently ignored.
285 SUBARCH
:= $(shell uname
-m | sed
-e s
/i
.86/x86
/ -e s
/x86_64
/x86
/ \
286 -e s
/sun4u
/sparc64
/ \
287 -e s
/arm.
*/arm
/ -e s
/sa110
/arm
/ \
288 -e s
/s390x
/s390
/ -e s
/parisc64
/parisc
/ \
289 -e s
/ppc.
*/powerpc
/ -e s
/mips.
*/mips
/ \
290 -e s
/sh
[234].
*/sh
/ -e s
/aarch64.
*/arm64
/ )
292 # Cross compiling and selecting different set of gcc/bin-utils
293 # ---------------------------------------------------------------------------
295 # When performing cross compilation for other architectures ARCH shall be set
296 # to the target architecture. (See arch/* for the possibilities).
297 # ARCH can be set during invocation of make:
299 # Another way is to have ARCH set in the environment.
300 # The default ARCH is the host where make is executed.
302 # CROSS_COMPILE specify the prefix used for all executables used
303 # during compilation. Only gcc and related bin-utils executables
304 # are prefixed with $(CROSS_COMPILE).
305 # CROSS_COMPILE can be set on the command line
306 # make CROSS_COMPILE=ia64-linux-
307 # Alternatively CROSS_COMPILE can be set in the environment.
308 # A third alternative is to store a setting in .config so that plain
309 # "make" in the configured kernel build directory always uses that.
310 # Default value for CROSS_COMPILE is not to prefix executables
311 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
313 CROSS_COMPILE ?
= $(CONFIG_CROSS_COMPILE
:"%"=%)
315 # Architecture as present in compile.h
316 UTS_MACHINE
:= $(ARCH
)
319 # Additional ARCH settings for x86
323 ifeq ($(ARCH
),x86_64
)
327 # Additional ARCH settings for sparc
328 ifeq ($(ARCH
),sparc32
)
331 ifeq ($(ARCH
),sparc64
)
335 # Additional ARCH settings for sh
340 # Additional ARCH settings for tile
341 ifeq ($(ARCH
),tilepro
)
344 ifeq ($(ARCH
),tilegx
)
348 KCONFIG_CONFIG ?
= .config
349 export KCONFIG_CONFIG
351 # SHELL used by kbuild
352 CONFIG_SHELL
:= $(shell if
[ -x
"$$BASH" ]; then echo
$$BASH; \
353 else if
[ -x
/bin
/bash
]; then echo
/bin
/bash
; \
354 else echo sh
; fi
; fi
)
356 HOST_LFS_CFLAGS
:= $(shell getconf LFS_CFLAGS
)
357 HOST_LFS_LDFLAGS
:= $(shell getconf LFS_LDFLAGS
)
358 HOST_LFS_LIBS
:= $(shell getconf LFS_LIBS
)
362 HOSTCFLAGS
:= -Wall
-Wmissing-prototypes
-Wstrict-prototypes
-O2 \
363 -fomit-frame-pointer
-std
=gnu89
$(HOST_LFS_CFLAGS
)
364 HOSTCXXFLAGS
:= -O2
$(HOST_LFS_CFLAGS
)
365 HOSTLDFLAGS
:= $(HOST_LFS_LDFLAGS
)
366 HOST_LOADLIBES
:= $(HOST_LFS_LIBS
)
368 # Make variables (CC, etc...)
369 AS
= $(CROSS_COMPILE
)as
370 LD
= $(CROSS_COMPILE
)ld
371 CC
= $(CROSS_COMPILE
)gcc
373 AR
= $(CROSS_COMPILE
)ar
374 NM
= $(CROSS_COMPILE
)nm
375 STRIP
= $(CROSS_COMPILE
)strip
376 OBJCOPY
= $(CROSS_COMPILE
)objcopy
377 OBJDUMP
= $(CROSS_COMPILE
)objdump
379 GENKSYMS
= scripts
/genksyms
/genksyms
380 INSTALLKERNEL
:= installkernel
381 DEPMOD
= /sbin
/depmod
386 CHECKFLAGS
:= -D__linux__
-Dlinux
-D__STDC__
-Dunix
-D__unix__ \
387 -Wbitwise
-Wno-return-void
$(CF
)
396 # Use USERINCLUDE when you must reference the UAPI directories only.
398 -I
$(srctree
)/arch
/$(SRCARCH
)/include/uapi \
399 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated
/uapi \
400 -I
$(srctree
)/include/uapi \
401 -I
$(objtree
)/include/generated
/uapi \
402 -include $(srctree
)/include/linux
/kconfig.h
404 # Use LINUXINCLUDE when you must reference the include/ directory.
405 # Needed to be compatible with the O= option
407 -I
$(srctree
)/arch
/$(SRCARCH
)/include \
408 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated \
409 $(if
$(KBUILD_SRC
), -I
$(srctree
)/include) \
410 -I
$(objtree
)/include \
413 KBUILD_AFLAGS
:= -D__ASSEMBLY__
414 KBUILD_CFLAGS
:= -Wall
-Wundef
-Wstrict-prototypes
-Wno-trigraphs \
415 -fno-strict-aliasing
-fno-common
-fshort-wchar \
416 -Werror-implicit-function-declaration \
417 -Wno-format-security \
419 KBUILD_CPPFLAGS
:= -D__KERNEL__
420 KBUILD_AFLAGS_KERNEL
:=
421 KBUILD_CFLAGS_KERNEL
:=
422 KBUILD_AFLAGS_MODULE
:= -DMODULE
423 KBUILD_CFLAGS_MODULE
:= -DMODULE
424 KBUILD_LDFLAGS_MODULE
:= -T
$(srctree
)/scripts
/module-common.lds
425 GCC_PLUGINS_CFLAGS
:=
427 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
428 export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
429 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
430 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
432 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
433 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_KASAN CFLAGS_UBSAN
434 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
435 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
436 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
437 export KBUILD_ARFLAGS
439 # When compiling out-of-tree modules, put MODVERDIR in the module
440 # tree rather than in the kernel tree. The kernel tree might
442 export MODVERDIR
:= $(if
$(KBUILD_EXTMOD
),$(firstword $(KBUILD_EXTMOD
))/).tmp_versions
444 # Files to ignore in find ... statements
446 export RCS_FIND_IGNORE
:= \
( -name SCCS
-o
-name BitKeeper
-o
-name .svn
-o \
447 -name CVS
-o
-name .
pc -o
-name .hg
-o
-name .git \
) \
449 export RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn \
450 --exclude CVS
--exclude .
pc --exclude .hg
--exclude .git
452 # ===========================================================================
453 # Rules shared between *config targets and build targets
455 # Basic helpers built in scripts/basic/
456 PHONY
+= scripts_basic
458 $(Q
)$(MAKE
) $(build
)=scripts
/basic
459 $(Q
)rm -f .tmp_quiet_recordmcount
461 # To avoid any implicit rule to kick in, define an empty command.
462 scripts
/basic
/%: scripts_basic
;
464 PHONY
+= outputmakefile
465 # outputmakefile generates a Makefile in the output directory, if using a
466 # separate output directory. This allows convenient use of make in the
469 ifneq ($(KBUILD_SRC
),)
470 $(Q
)ln
-fsn
$(srctree
) source
471 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/mkmakefile \
472 $(srctree
) $(objtree
) $(VERSION
) $(PATCHLEVEL
)
475 ifeq ($(config-targets
),1)
476 # ===========================================================================
477 # *config targets only - make sure prerequisites are updated, and descend
478 # in scripts/kconfig to make the *config target
480 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
481 # KBUILD_DEFCONFIG may point out an alternative default configuration
482 # used for 'make defconfig'
483 include arch
/$(SRCARCH
)/Makefile
484 export KBUILD_DEFCONFIG KBUILD_KCONFIG
486 config
: scripts_basic outputmakefile FORCE
487 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
489 %config
: scripts_basic outputmakefile FORCE
490 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
493 # ===========================================================================
494 # Build targets only - this includes vmlinux, arch specific targets, clean
495 # targets and others. In general all targets except *config targets.
497 # If building an external module we do not care about the all: rule
498 # but instead _all depend on modules
500 ifeq ($(KBUILD_EXTMOD
),)
506 # Decide whether to build built-in, modular, or both.
507 # Normally, just do built-in.
512 # If we have only "make modules", don't compile built-in objects.
513 # When we're building modules with modversions, we need to consider
514 # the built-in objects during the descend as well, in order to
515 # make sure the checksums are up to date before we record them.
517 ifeq ($(MAKECMDGOALS
),modules
)
518 KBUILD_BUILTIN
:= $(if
$(CONFIG_MODVERSIONS
),1)
521 # If we have "make <whatever> modules", compile modules
522 # in addition to whatever we do anyway.
523 # Just "make" or "make all" shall build modules as well
525 ifneq ($(filter all _all modules
,$(MAKECMDGOALS
)),)
529 ifeq ($(MAKECMDGOALS
),)
533 export KBUILD_MODULES KBUILD_BUILTIN
535 ifeq ($(KBUILD_EXTMOD
),)
536 # Additional helpers built in scripts/
537 # Carefully list dependencies so we do not try to build scripts twice
540 scripts
: scripts_basic
include/config
/auto.conf
include/config
/tristate.conf \
541 asm-generic gcc-plugins
542 $(Q
)$(MAKE
) $(build
)=$(@
)
544 # Objects we will link into vmlinux / subdirs we need to visit
546 drivers-y
:= drivers
/ sound
/ firmware
/
551 endif # KBUILD_EXTMOD
553 ifeq ($(dot-config
),1)
555 -include include/config
/auto.conf
557 ifeq ($(KBUILD_EXTMOD
),)
558 # Read in dependencies to all Kconfig* files, make sure to run
559 # oldconfig if changes are detected.
560 -include include/config
/auto.conf.cmd
562 # To avoid any implicit rule to kick in, define an empty command
563 $(KCONFIG_CONFIG
) include/config
/auto.conf.cmd
: ;
565 # If .config is newer than include/config/auto.conf, someone tinkered
566 # with it and forgot to run make oldconfig.
567 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
568 # we execute the config step to be sure to catch updated Kconfig files
569 include/config
/%.conf
: $(KCONFIG_CONFIG
) include/config
/auto.conf.cmd
570 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile silentoldconfig
572 # external modules needs include/generated/autoconf.h and include/config/auto.conf
573 # but do not care if they are up-to-date. Use auto.conf to trigger the test
574 PHONY
+= include/config
/auto.conf
576 include/config
/auto.conf
:
577 $(Q
)test -e
include/generated
/autoconf.h
-a
-e
$@ ||
( \
579 echo
>&2 " ERROR: Kernel configuration is invalid."; \
580 echo
>&2 " include/generated/autoconf.h or $@ are missing.";\
581 echo
>&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
585 endif # KBUILD_EXTMOD
588 # Dummy target needed, because used as prerequisite
589 include/config
/auto.conf
: ;
590 endif # $(dot-config)
592 # For the kernel to actually contain only the needed exported symbols,
593 # we have to build modules as well to determine what those symbols are.
594 # (this can be evaluated only once include/config/auto.conf has been included)
595 ifdef CONFIG_TRIM_UNUSED_KSYMS
599 # The all: target is the default when no target is given on the
601 # This allow a user to issue only 'make' to build a kernel including modules
602 # Defaults to vmlinux, but the arch makefile usually adds further targets
605 KBUILD_CFLAGS
+= $(call cc-option
,-fno-PIE
)
606 KBUILD_AFLAGS
+= $(call cc-option
,-fno-PIE
)
607 CFLAGS_GCOV
:= -fprofile-arcs
-ftest-coverage
-fno-tree-loop-im
$(call cc-disable-warning
,maybe-uninitialized
,)
608 CFLAGS_KCOV
:= $(call cc-option
,-fsanitize-coverage
=trace-pc
,)
609 export CFLAGS_GCOV CFLAGS_KCOV
611 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
612 # values of the respective KBUILD_* variables
616 include arch
/$(SRCARCH
)/Makefile
618 KBUILD_CFLAGS
+= $(call cc-option
,-fno-delete-null-pointer-checks
,)
619 KBUILD_CFLAGS
+= $(call cc-disable-warning
,frame-address
,)
620 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-truncation
)
621 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-overflow
)
622 KBUILD_CFLAGS
+= $(call cc-disable-warning
, int-in-bool-context
)
624 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
625 KBUILD_CFLAGS
+= $(call cc-option
,-Oz
,-Os
)
626 KBUILD_CFLAGS
+= $(call cc-disable-warning
,maybe-uninitialized
,)
628 ifdef CONFIG_PROFILE_ALL_BRANCHES
629 KBUILD_CFLAGS
+= -O2
$(call cc-disable-warning
,maybe-uninitialized
,)
635 KBUILD_CFLAGS
+= $(call cc-ifversion
, -lt
, 0409, \
636 $(call cc-disable-warning
,maybe-uninitialized
,))
638 # Tell gcc to never replace conditional load with a non-conditional one
639 KBUILD_CFLAGS
+= $(call cc-option
,--param
=allow-store-data-races
=0)
641 # check for 'asm goto'
642 ifeq ($(call shell-cached
,$(CONFIG_SHELL
) $(srctree
)/scripts
/gcc-goto.sh
$(CC
) $(KBUILD_CFLAGS
)), y
)
643 KBUILD_CFLAGS
+= -DCC_HAVE_ASM_GOTO
644 KBUILD_AFLAGS
+= -DCC_HAVE_ASM_GOTO
647 include scripts
/Makefile.gcc-plugins
649 ifdef CONFIG_READABLE_ASM
650 # Disable optimizations that make assembler listings hard to read.
651 # reorder blocks reorders the control in the function
652 # ipa clone creates specialized cloned functions
653 # partial inlining inlines only parts of functions
654 KBUILD_CFLAGS
+= $(call cc-option
,-fno-reorder-blocks
,) \
655 $(call cc-option
,-fno-ipa-cp-clone
,) \
656 $(call cc-option
,-fno-partial-inlining
)
659 ifneq ($(CONFIG_FRAME_WARN
),0)
660 KBUILD_CFLAGS
+= $(call cc-option
,-Wframe-larger-than
=${CONFIG_FRAME_WARN})
663 # This selects the stack protector compiler flag. Testing it is delayed
664 # until after .config has been reprocessed, in the prepare-compiler-check
666 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
667 stackp-flag
:= -fstack-protector
668 stackp-name
:= REGULAR
670 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
671 stackp-flag
:= -fstack-protector-strong
672 stackp-name
:= STRONG
674 # Force off for distro compilers that enable stack protector by default.
675 stackp-flag
:= $(call cc-option
, -fno-stack-protector
)
678 # Find arch-specific stack protector compiler sanity-checking script.
679 ifdef CONFIG_CC_STACKPROTECTOR
680 stackp-path
:= $(srctree
)/scripts
/gcc-
$(SRCARCH
)_
$(BITS
)-has-stack-protector.sh
681 stackp-check
:= $(wildcard $(stackp-path
))
683 KBUILD_CFLAGS
+= $(stackp-flag
)
685 ifeq ($(cc-name
),clang
)
686 ifneq ($(CROSS_COMPILE
),)
687 CLANG_TARGET
:= -target
$(notdir $(CROSS_COMPILE
:%-=%))
688 GCC_TOOLCHAIN
:= $(realpath
$(dir $(shell which
$(LD
)))/..
)
690 ifneq ($(GCC_TOOLCHAIN
),)
691 CLANG_GCC_TC
:= -gcc-toolchain
$(GCC_TOOLCHAIN
)
693 KBUILD_CFLAGS
+= $(CLANG_TARGET
) $(CLANG_GCC_TC
)
694 KBUILD_AFLAGS
+= $(CLANG_TARGET
) $(CLANG_GCC_TC
)
695 KBUILD_CPPFLAGS
+= $(call cc-option
,-Qunused-arguments
,)
696 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-variable
)
697 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-invalid-specifier
)
698 KBUILD_CFLAGS
+= $(call cc-disable-warning
, gnu
)
699 KBUILD_CFLAGS
+= $(call cc-disable-warning
, address-of-packed-member
)
700 # Quiet clang warning: comparison of unsigned expression < 0 is always false
701 KBUILD_CFLAGS
+= $(call cc-disable-warning
, tautological-compare
)
702 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
703 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
704 # See modpost pattern 2
705 KBUILD_CFLAGS
+= $(call cc-option
, -mno-global-merge
,)
706 KBUILD_CFLAGS
+= $(call cc-option
, -fcatch-undefined-behavior
)
707 KBUILD_CFLAGS
+= $(call cc-option
, -no-integrated-as
)
708 KBUILD_AFLAGS
+= $(call cc-option
, -no-integrated-as
)
711 # These warnings generated too much noise in a regular build.
712 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
713 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-but-set-variable
)
714 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-const-variable
)
717 ifdef CONFIG_FRAME_POINTER
718 KBUILD_CFLAGS
+= -fno-omit-frame-pointer
-fno-optimize-sibling-calls
720 # Some targets (ARM with Thumb2, for example), can't be built with frame
721 # pointers. For those, we don't have FUNCTION_TRACER automatically
722 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
723 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
724 # -fomit-frame-pointer with FUNCTION_TRACER.
725 ifndef CONFIG_FUNCTION_TRACER
726 KBUILD_CFLAGS
+= -fomit-frame-pointer
730 KBUILD_CFLAGS
+= $(call cc-option
, -fno-var-tracking-assignments
)
732 ifdef CONFIG_DEBUG_INFO
733 ifdef CONFIG_DEBUG_INFO_SPLIT
734 KBUILD_CFLAGS
+= $(call cc-option
, -gsplit-dwarf
, -g
)
738 KBUILD_AFLAGS
+= -Wa
,-gdwarf-2
740 ifdef CONFIG_DEBUG_INFO_DWARF4
741 KBUILD_CFLAGS
+= $(call cc-option
, -gdwarf-4
,)
744 ifdef CONFIG_DEBUG_INFO_REDUCED
745 KBUILD_CFLAGS
+= $(call cc-option
, -femit-struct-debug-baseonly
) \
746 $(call cc-option
,-fno-var-tracking
)
749 ifdef CONFIG_FUNCTION_TRACER
750 ifndef CC_FLAGS_FTRACE
751 CC_FLAGS_FTRACE
:= -pg
753 export CC_FLAGS_FTRACE
754 ifdef CONFIG_HAVE_FENTRY
755 CC_USING_FENTRY
:= $(call cc-option
, -mfentry
-DCC_USING_FENTRY
)
757 KBUILD_CFLAGS
+= $(CC_FLAGS_FTRACE
) $(CC_USING_FENTRY
)
758 KBUILD_AFLAGS
+= $(CC_USING_FENTRY
)
759 ifdef CONFIG_DYNAMIC_FTRACE
760 ifdef CONFIG_HAVE_C_RECORDMCOUNT
761 BUILD_C_RECORDMCOUNT
:= y
762 export BUILD_C_RECORDMCOUNT
767 # We trigger additional mismatches with less inlining
768 ifdef CONFIG_DEBUG_SECTION_MISMATCH
769 KBUILD_CFLAGS
+= $(call cc-option
, -fno-inline-functions-called-once
)
772 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
773 KBUILD_CFLAGS
+= $(call cc-option
,-ffunction-sections
,)
774 KBUILD_CFLAGS
+= $(call cc-option
,-fdata-sections
,)
777 # arch Makefile may override CC so keep this after arch Makefile is included
778 NOSTDINC_FLAGS
+= -nostdinc
-isystem
$(call shell-cached
,$(CC
) -print-file-name
=include)
779 CHECKFLAGS
+= $(NOSTDINC_FLAGS
)
781 # warn about C99 declaration after statement
782 KBUILD_CFLAGS
+= $(call cc-option
,-Wdeclaration-after-statement
,)
784 # disable pointer signed / unsigned warnings in gcc 4.0
785 KBUILD_CFLAGS
+= $(call cc-disable-warning
, pointer-sign
)
787 # disable invalid "can't wrap" optimizations for signed / pointers
788 KBUILD_CFLAGS
+= $(call cc-option
,-fno-strict-overflow
)
790 # conserve stack if available
791 KBUILD_CFLAGS
+= $(call cc-option
,-fconserve-stack
)
793 # disallow errors like 'EXPORT_GPL(foo);' with missing header
794 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=implicit-int
)
796 # require functions to have arguments in prototypes, not empty 'int foo()'
797 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=strict-prototypes
)
799 # Prohibit date/time macros, which would make the build non-deterministic
800 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=date-time
)
802 # enforce correct pointer usage
803 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=incompatible-pointer-types
)
805 # Require designated initializers for all marked structures
806 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=designated-init
)
808 # use the deterministic mode of AR if available
809 KBUILD_ARFLAGS
:= $(call ar-option
,D
)
811 include scripts
/Makefile.kasan
812 include scripts
/Makefile.extrawarn
813 include scripts
/Makefile.ubsan
815 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
817 KBUILD_CPPFLAGS
+= $(ARCH_CPPFLAGS
) $(KCPPFLAGS
)
818 KBUILD_AFLAGS
+= $(ARCH_AFLAGS
) $(KAFLAGS
)
819 KBUILD_CFLAGS
+= $(ARCH_CFLAGS
) $(KCFLAGS
)
821 # Use --build-id when available.
822 LDFLAGS_BUILD_ID
:= $(patsubst -Wl
$(comma
)%,%,\
823 $(call cc-ldoption
, -Wl
$(comma
)--build-id
,))
824 KBUILD_LDFLAGS_MODULE
+= $(LDFLAGS_BUILD_ID
)
825 LDFLAGS_vmlinux
+= $(LDFLAGS_BUILD_ID
)
827 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
828 LDFLAGS_vmlinux
+= $(call ld-option
, --gc-sections
,)
831 ifeq ($(CONFIG_STRIP_ASM_SYMS
),y
)
832 LDFLAGS_vmlinux
+= $(call ld-option
, -X
,)
835 # Default kernel image to build when no specific target is given.
836 # KBUILD_IMAGE may be overruled on the command line or
837 # set in the environment
838 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
840 export KBUILD_IMAGE ?
= vmlinux
843 # INSTALL_PATH specifies where to place the updated kernel and system map
844 # images. Default is /boot, but you can set it to other values
845 export INSTALL_PATH ?
= /boot
848 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
849 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
850 # an argument if needed. Otherwise it defaults to the kernel install path
852 export INSTALL_DTBS_PATH ?
= $(INSTALL_PATH
)/dtbs
/$(KERNELRELEASE
)
855 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
856 # relocations required by build roots. This is not defined in the
857 # makefile but the argument can be passed to make if needed.
860 MODLIB
= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
864 # INSTALL_MOD_STRIP, if defined, will cause modules to be
865 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
866 # the default option --strip-debug will be used. Otherwise,
867 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
869 ifdef INSTALL_MOD_STRIP
870 ifeq ($(INSTALL_MOD_STRIP
),1)
871 mod_strip_cmd
= $(STRIP
) --strip-debug
873 mod_strip_cmd
= $(STRIP
) $(INSTALL_MOD_STRIP
)
874 endif # INSTALL_MOD_STRIP=1
877 endif # INSTALL_MOD_STRIP
880 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
881 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
882 # or CONFIG_MODULE_COMPRESS_XZ.
884 mod_compress_cmd
= true
885 ifdef CONFIG_MODULE_COMPRESS
886 ifdef CONFIG_MODULE_COMPRESS_GZIP
887 mod_compress_cmd
= gzip
-n
-f
888 endif # CONFIG_MODULE_COMPRESS_GZIP
889 ifdef CONFIG_MODULE_COMPRESS_XZ
890 mod_compress_cmd
= xz
-f
891 endif # CONFIG_MODULE_COMPRESS_XZ
892 endif # CONFIG_MODULE_COMPRESS
893 export mod_compress_cmd
895 # Select initial ramdisk compression format, default is gzip(1).
896 # This shall be used by the dracut(8) tool while creating an initramfs image.
898 INITRD_COMPRESS-y
:= gzip
899 INITRD_COMPRESS-
$(CONFIG_RD_BZIP2
) := bzip2
900 INITRD_COMPRESS-
$(CONFIG_RD_LZMA
) := lzma
901 INITRD_COMPRESS-
$(CONFIG_RD_XZ
) := xz
902 INITRD_COMPRESS-
$(CONFIG_RD_LZO
) := lzo
903 INITRD_COMPRESS-
$(CONFIG_RD_LZ4
) := lz4
904 # do not export INITRD_COMPRESS, since we didn't actually
905 # choose a sane default compression above.
906 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
908 ifdef CONFIG_MODULE_SIG_ALL
909 $(eval
$(call config_filename
,MODULE_SIG_KEY
))
911 mod_sign_cmd
= scripts
/sign-file
$(CONFIG_MODULE_SIG_HASH
) $(MODULE_SIG_KEY_SRCPREFIX
)$(CONFIG_MODULE_SIG_KEY
) certs
/signing_key.x509
917 ifdef CONFIG_STACK_VALIDATION
918 has_libelf
:= $(call try-run
,\
919 echo
"int main() {}" |
$(HOSTCC
) -xc
-o
/dev
/null
-lelf
-,1,0)
920 ifeq ($(has_libelf
),1)
921 objtool_target
:= tools
/objtool FORCE
923 $(warning
"Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
924 SKIP_STACK_VALIDATION
:= 1
925 export SKIP_STACK_VALIDATION
930 ifeq ($(KBUILD_EXTMOD
),)
931 core-y
+= kernel
/ certs
/ mm
/ fs
/ ipc
/ security
/ crypto
/ block
/
933 vmlinux-dirs
:= $(patsubst %/,%,$(filter %/, $(init-y
) $(init-m
) \
934 $(core-y
) $(core-m
) $(drivers-y
) $(drivers-m
) \
935 $(net-y
) $(net-m
) $(libs-y
) $(libs-m
) $(virt-y
)))
937 vmlinux-alldirs
:= $(sort $(vmlinux-dirs
) $(patsubst %/,%,$(filter %/, \
938 $(init-
) $(core-
) $(drivers-
) $(net-
) $(libs-
) $(virt-
))))
940 init-y
:= $(patsubst %/, %/built-in.o
, $(init-y
))
941 core-y
:= $(patsubst %/, %/built-in.o
, $(core-y
))
942 drivers-y
:= $(patsubst %/, %/built-in.o
, $(drivers-y
))
943 net-y
:= $(patsubst %/, %/built-in.o
, $(net-y
))
944 libs-y1
:= $(patsubst %/, %/lib.a
, $(libs-y
))
945 libs-y2
:= $(filter-out %.a
, $(patsubst %/, %/built-in.o
, $(libs-y
)))
946 virt-y
:= $(patsubst %/, %/built-in.o
, $(virt-y
))
948 # Externally visible symbols (used by link-vmlinux.sh)
949 export KBUILD_VMLINUX_INIT
:= $(head-y
) $(init-y
)
950 export KBUILD_VMLINUX_MAIN
:= $(core-y
) $(libs-y2
) $(drivers-y
) $(net-y
) $(virt-y
)
951 export KBUILD_VMLINUX_LIBS
:= $(libs-y1
)
952 export KBUILD_LDS
:= arch
/$(SRCARCH
)/kernel
/vmlinux.lds
953 export LDFLAGS_vmlinux
954 # used by scripts/package/Makefile
955 export KBUILD_ALLDIRS
:= $(sort $(filter-out arch
/%,$(vmlinux-alldirs
)) arch Documentation
include samples scripts tools
)
957 vmlinux-deps
:= $(KBUILD_LDS
) $(KBUILD_VMLINUX_INIT
) $(KBUILD_VMLINUX_MAIN
) $(KBUILD_VMLINUX_LIBS
)
959 # Include targets which we want to execute sequentially if the rest of the
960 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
961 # evaluated more than once.
962 PHONY
+= vmlinux_prereq
963 vmlinux_prereq
: $(vmlinux-deps
) FORCE
964 ifdef CONFIG_HEADERS_CHECK
965 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile headers_check
967 ifdef CONFIG_GDB_SCRIPTS
968 $(Q
)ln
-fsn
$(abspath
$(srctree
)/scripts
/gdb
/vmlinux-gdb.py
)
970 ifdef CONFIG_TRIM_UNUSED_KSYMS
971 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/adjust_autoksyms.sh \
972 "$(MAKE) -f $(srctree)/Makefile vmlinux"
975 # standalone target for easier testing
976 include/generated
/autoksyms.h
: FORCE
977 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/adjust_autoksyms.sh true
979 ARCH_POSTLINK
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/Makefile.postlink
)
981 # Final link of vmlinux with optional arch pass after final link
983 $(CONFIG_SHELL
) $< $(LD
) $(LDFLAGS
) $(LDFLAGS_vmlinux
) ; \
984 $(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) $@
, true
)
986 vmlinux
: scripts
/link-vmlinux.sh vmlinux_prereq
$(vmlinux-deps
) FORCE
987 +$(call if_changed
,link-vmlinux
)
989 # Build samples along the rest of the kernel
991 vmlinux-dirs
+= samples
994 # The actual objects are generated when descending,
995 # make sure no implicit rule kicks in
996 $(sort $(vmlinux-deps
)): $(vmlinux-dirs
) ;
998 # Handle descending into subdirectories listed in $(vmlinux-dirs)
999 # Preset locale variables to speed up the build process. Limit locale
1000 # tweaks to this spot to avoid wrong language settings when running
1001 # make menuconfig etc.
1002 # Error messages still appears in the original language
1004 PHONY
+= $(vmlinux-dirs
)
1005 $(vmlinux-dirs
): prepare scripts
1006 $(Q
)$(MAKE
) $(build
)=$@
1008 define filechk_kernel.release
1009 echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1012 # Store (new) KERNELRELEASE string in include/config/kernel.release
1013 include/config
/kernel.release
: include/config
/auto.conf FORCE
1014 $(call filechk
,kernel.release
)
1017 # Things we need to do before we recursively start building the kernel
1018 # or the modules are listed in "prepare".
1019 # A multi level approach is used. prepareN is processed before prepareN-1.
1020 # archprepare is used in arch Makefiles and when processed asm symlink,
1021 # version.h and scripts_basic is processed / created.
1023 # Listed in dependency order
1024 PHONY
+= prepare archprepare prepare0 prepare1 prepare2 prepare3
1026 # prepare3 is used to check if we are building in a separate output directory,
1028 # 1) Check that make has not been executed in the kernel src $(srctree)
1029 prepare3
: include/config
/kernel.release
1030 ifneq ($(KBUILD_SRC
),)
1031 @
$(kecho
) ' Using $(srctree) as source for kernel'
1032 $(Q
)if
[ -f
$(srctree
)/.config
-o
-d
$(srctree
)/include/config
]; then \
1033 echo
>&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1034 echo
>&2 " in the '$(srctree)' directory.";\
1039 # prepare2 creates a makefile if using a separate output directory.
1040 # From this point forward, .config has been reprocessed, so any rules
1041 # that need to depend on updated CONFIG_* values can be checked here.
1042 prepare2
: prepare3 prepare-compiler-check outputmakefile asm-generic
1044 prepare1
: prepare2
$(version_h
) include/generated
/utsrelease.h \
1045 include/config
/auto.conf
1048 archprepare
: archheaders archscripts prepare1 scripts_basic
1050 prepare0
: archprepare gcc-plugins
1051 $(Q
)$(MAKE
) $(build
)=.
1053 # All the preparing..
1054 prepare
: prepare0 prepare-objtool
1056 # Support for using generic headers in asm-generic
1057 PHONY
+= asm-generic uapi-asm-generic
1058 asm-generic
: uapi-asm-generic
1059 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.asm-generic \
1060 src
=asm obj
=arch
/$(SRCARCH
)/include/generated
/asm
1062 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.asm-generic \
1063 src
=uapi
/asm obj
=arch
/$(SRCARCH
)/include/generated
/uapi
/asm
1065 PHONY
+= prepare-objtool
1066 prepare-objtool
: $(objtool_target
)
1068 # Check for CONFIG flags that require compiler support. Abort the build
1069 # after .config has been processed, but before the kernel build starts.
1071 # For security-sensitive CONFIG options, we don't want to fallback and/or
1072 # silently change which compiler flags will be used, since that leads to
1073 # producing kernels with different security feature characteristics
1074 # depending on the compiler used. (For example, "But I selected
1075 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1076 PHONY
+= prepare-compiler-check
1077 prepare-compiler-check
: FORCE
1078 # Make sure compiler supports requested stack protector flag.
1080 ifeq ($(call cc-option
, $(stackp-flag
)),)
1081 @echo Cannot use CONFIG_CC_STACKPROTECTOR_
$(stackp-name
): \
1082 $(stackp-flag
) not supported by compiler
>&2 && exit
1
1085 # Make sure compiler does not have buggy stack-protector support.
1087 ifneq ($(shell $(CONFIG_SHELL
) $(stackp-check
) $(CC
) $(KBUILD_CPPFLAGS
) $(biarch
)),y
)
1088 @echo Cannot use CONFIG_CC_STACKPROTECTOR_
$(stackp-name
): \
1089 $(stackp-flag
) available but compiler is broken
>&2 && exit
1
1094 # Generate some files
1095 # ---------------------------------------------------------------------------
1097 # KERNELRELEASE can change from a few different places, meaning version.h
1098 # needs to be updated, so this check is forced on all builds
1101 define filechk_utsrelease.h
1102 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
1103 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1106 (echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1109 define filechk_version.h
1110 (echo \
#define LINUX_VERSION_CODE $(shell \
1111 expr
$(VERSION
) \
* 65536 + 0$(PATCHLEVEL
) \
* 256 + 0$(SUBLEVEL
)); \
1112 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1115 $(version_h
): $(srctree
)/Makefile FORCE
1116 $(call filechk
,version.h
)
1117 $(Q
)rm -f
$(old_version_h
)
1119 include/generated
/utsrelease.h
: include/config
/kernel.release FORCE
1120 $(call filechk
,utsrelease.h
)
1124 $(Q
)find
$(srctree
)/include/ -name
'*.h' | xargs
--max-args
1 \
1125 $(srctree
)/scripts
/headerdep.pl
-I
$(srctree
)/include
1127 # ---------------------------------------------------------------------------
1130 #Default location for installed headers
1131 export INSTALL_HDR_PATH
= $(objtree
)/usr
1133 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1134 hdr-dst
= $(if
$(KBUILD_HEADERS
), dst
=include/arch-
$(SRCARCH
), dst
=include)
1136 PHONY
+= archheaders
1139 PHONY
+= archscripts
1143 __headers
: $(version_h
) scripts_basic uapi-asm-generic archheaders archscripts
1144 $(Q
)$(MAKE
) $(build
)=scripts build_unifdef
1146 PHONY
+= headers_install_all
1147 headers_install_all
:
1148 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
install
1150 PHONY
+= headers_install
1151 headers_install
: __headers
1152 $(if
$(wildcard $(srctree
)/arch
/$(SRCARCH
)/include/uapi
/asm
/Kbuild
),, \
1153 $(error Headers not exportable for the
$(SRCARCH
) architecture
))
1154 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi dst
=include
1155 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(SRCARCH
)/include/uapi
$(hdr-dst
)
1157 PHONY
+= headers_check_all
1158 headers_check_all
: headers_install_all
1159 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
check
1161 PHONY
+= headers_check
1162 headers_check
: headers_install
1163 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi dst
=include HDRCHECK
=1
1164 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(SRCARCH
)/include/uapi
$(hdr-dst
) HDRCHECK
=1
1166 # ---------------------------------------------------------------------------
1171 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests run_tests
1173 PHONY
+= kselftest-clean
1175 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests
clean
1177 PHONY
+= kselftest-merge
1179 $(if
$(wildcard $(objtree
)/.config
),, $(error No .config exists
, config your kernel first
!))
1180 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/kconfig
/merge_config.sh \
1181 -m
$(objtree
)/.config \
1182 $(srctree
)/tools
/testing
/selftests
/*/config
1183 +$(Q
)$(MAKE
) -f
$(srctree
)/Makefile olddefconfig
1185 # ---------------------------------------------------------------------------
1188 ifdef CONFIG_MODULES
1190 # By default, build modules as well
1196 # A module can be listed more than once in obj-m resulting in
1197 # duplicate lines in modules.order files. Those are removed
1198 # using awk while concatenating to the final file.
1201 modules
: $(vmlinux-dirs
) $(if
$(KBUILD_BUILTIN
),vmlinux
) modules.builtin
1202 $(Q
)$(AWK
) '!x[$$0]++' $(vmlinux-dirs
:%=$(objtree
)/%/modules.order
) > $(objtree
)/modules.order
1203 @
$(kecho
) ' Building modules, stage 2.';
1204 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1206 modules.builtin
: $(vmlinux-dirs
:%=%/modules.builtin
)
1207 $(Q
)$(AWK
) '!x[$$0]++' $^
> $(objtree
)/modules.builtin
1209 %/modules.builtin
: include/config
/auto.conf
1210 $(Q
)$(MAKE
) $(modbuiltin
)=$*
1213 # Target to prepare building external modules
1214 PHONY
+= modules_prepare
1215 modules_prepare
: prepare scripts
1217 # Target to install modules
1218 PHONY
+= modules_install
1219 modules_install
: _modinst_ _modinst_post
1223 @
rm -rf
$(MODLIB
)/kernel
1224 @
rm -f
$(MODLIB
)/source
1225 @mkdir
-p
$(MODLIB
)/kernel
1226 @ln
-s
$(abspath
$(srctree
)) $(MODLIB
)/source
1227 @if
[ ! $(objtree
) -ef
$(MODLIB
)/build
]; then \
1228 rm -f
$(MODLIB
)/build
; \
1229 ln
-s
$(CURDIR
) $(MODLIB
)/build
; \
1231 @cp
-f
$(objtree
)/modules.order
$(MODLIB
)/
1232 @cp
-f
$(objtree
)/modules.builtin
$(MODLIB
)/
1233 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1235 # This depmod is only for convenience to give the initial
1236 # boot a modules.dep even before / is mounted read-write. However the
1237 # boot script depmod is the master version.
1238 PHONY
+= _modinst_post
1239 _modinst_post
: _modinst_
1242 ifeq ($(CONFIG_MODULE_SIG
), y
)
1243 PHONY
+= modules_sign
1245 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modsign
1248 else # CONFIG_MODULES
1250 # Modules not configured
1251 # ---------------------------------------------------------------------------
1253 PHONY
+= modules modules_install
1254 modules modules_install
:
1256 @echo
>&2 "The present kernel configuration has modules disabled."
1257 @echo
>&2 "Type 'make config' and enable loadable module support."
1258 @echo
>&2 "Then build a kernel with module support enabled."
1262 endif # CONFIG_MODULES
1265 # Cleaning is done on three levels.
1266 # make clean Delete most generated files
1267 # Leave enough to build external modules
1268 # make mrproper Delete the current configuration, and all generated files
1269 # make distclean Remove editor backup files, patch leftover files and the like
1271 # Directories & files removed with 'make clean'
1272 CLEAN_DIRS
+= $(MODVERDIR
)
1274 # Directories & files removed with 'make mrproper'
1275 MRPROPER_DIRS
+= include/config usr
/include include/generated \
1276 arch
/*/include/generated .tmp_objdiff
1277 MRPROPER_FILES
+= .config .config.old .version \
1278 Module.symvers
tags TAGS cscope
* GPATH GTAGS GRTAGS GSYMS \
1279 signing_key.pem signing_key.priv signing_key.x509 \
1280 x509.genkey extra_certificates signing_key.x509.keyid \
1281 signing_key.x509.signer vmlinux-gdb.py
1283 # clean - Delete most, but leave enough to build external modules
1285 clean: rm-dirs
:= $(CLEAN_DIRS
)
1286 clean: rm-files
:= $(CLEAN_FILES
)
1287 clean-dirs
:= $(addprefix _clean_
, .
$(vmlinux-alldirs
) Documentation samples
)
1289 PHONY
+= $(clean-dirs
) clean archclean vmlinuxclean
1291 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1294 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/link-vmlinux.sh
clean
1295 $(Q
)$(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) clean)
1297 clean: archclean vmlinuxclean
1299 # mrproper - Delete all generated files, including .config
1301 mrproper
: rm-dirs
:= $(wildcard $(MRPROPER_DIRS
))
1302 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
1303 mrproper-dirs
:= $(addprefix _mrproper_
,scripts
)
1305 PHONY
+= $(mrproper-dirs
) mrproper archmrproper
1307 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
1309 mrproper
: clean archmrproper
$(mrproper-dirs
)
1318 @find
$(srctree
) $(RCS_FIND_IGNORE
) \
1319 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
1320 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'*%' \
1321 -o
-name
'core' \
) \
1322 -type f
-print | xargs
rm -f
1325 # Packaging of the kernel to various formats
1326 # ---------------------------------------------------------------------------
1327 # rpm target kept for backward compatibility
1328 package-dir
:= scripts
/package
1331 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1332 %pkg
: include/config
/kernel.release FORCE
1333 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1334 rpm
: include/config
/kernel.release FORCE
1335 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1338 # Brief documentation of the typical targets used
1339 # ---------------------------------------------------------------------------
1341 boards
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*_defconfig
)
1342 boards
:= $(sort $(notdir $(boards
)))
1343 board-dirs
:= $(dir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*/*_defconfig
))
1344 board-dirs
:= $(sort $(notdir $(board-dirs
:/=)))
1348 @echo
'Cleaning targets:'
1349 @echo
' clean - Remove most generated files but keep the config and'
1350 @echo
' enough build support to build external modules'
1351 @echo
' mrproper - Remove all generated files + config + various backup files'
1352 @echo
' distclean - mrproper + remove editor backup and patch files'
1354 @echo
'Configuration targets:'
1355 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
1357 @echo
'Other generic targets:'
1358 @echo
' all - Build all targets marked with [*]'
1359 @echo
'* vmlinux - Build the bare kernel'
1360 @echo
'* modules - Build all modules'
1361 @echo
' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1362 @echo
' dir/ - Build all files in dir and below'
1363 @echo
' dir/file.[ois] - Build specified target only'
1364 @echo
' dir/file.ll - Build the LLVM assembly file'
1365 @echo
' (requires compiler support for LLVM assembly generation)'
1366 @echo
' dir/file.lst - Build specified mixed source/assembly target only'
1367 @echo
' (requires a recent binutils and recent build (System.map))'
1368 @echo
' dir/file.ko - Build module including final link'
1369 @echo
' modules_prepare - Set up for building external modules'
1370 @echo
' tags/TAGS - Generate tags file for editors'
1371 @echo
' cscope - Generate cscope index'
1372 @echo
' gtags - Generate GNU GLOBAL index'
1373 @echo
' kernelrelease - Output the release version string (use with make -s)'
1374 @echo
' kernelversion - Output the version stored in Makefile (use with make -s)'
1375 @echo
' image_name - Output the image name (use with make -s)'
1376 @echo
' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1377 echo
' (default: $(INSTALL_HDR_PATH))'; \
1379 @echo
'Static analysers:'
1380 @echo
' checkstack - Generate a list of stack hogs'
1381 @echo
' namespacecheck - Name space analysis on compiled kernel'
1382 @echo
' versioncheck - Sanity check on version.h usage'
1383 @echo
' includecheck - Check for duplicate included header files'
1384 @echo
' export_report - List the usages of all exported symbols'
1385 @echo
' headers_check - Sanity check on exported headers'
1386 @echo
' headerdep - Detect inclusion cycles in headers'
1387 @
$(MAKE
) -f
$(srctree
)/scripts
/Makefile.help checker-help
1389 @echo
'Kernel selftest:'
1390 @echo
' kselftest - Build and run kernel selftest (run as root)'
1391 @echo
' Build, install, and boot kernel before'
1392 @echo
' running kselftest on it'
1393 @echo
' kselftest-clean - Remove all generated kselftest files'
1394 @echo
' kselftest-merge - Merge all the config dependencies of kselftest to existed'
1397 @echo
'Userspace tools targets:'
1398 @echo
' use "make tools/help"'
1399 @echo
' or "cd tools; make help"'
1401 @echo
'Kernel packaging:'
1402 @
$(MAKE
) $(build
)=$(package-dir
) help
1404 @echo
'Documentation targets:'
1405 @
$(MAKE
) -f
$(srctree
)/Documentation
/Makefile dochelp
1407 @echo
'Architecture specific targets ($(SRCARCH)):'
1408 @
$(if
$(archhelp
),$(archhelp
),\
1409 echo
' No architecture specific help defined for $(SRCARCH)')
1412 $(foreach b
, $(boards
), \
1413 printf
" %-24s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
1415 @
$(if
$(board-dirs
), \
1416 $(foreach b
, $(board-dirs
), \
1417 printf
" %-16s - Show %s-specific targets\\n" help-
$(b
) $(b
);) \
1418 printf
" %-16s - Show all of the above\\n" help-boards
; \
1421 @echo
' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1422 @echo
' make V=2 [targets] 2 => give reason for rebuild of target'
1423 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
1424 @echo
' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1425 @echo
' make C=2 [targets] Force check of all c source with $$CHECK'
1426 @echo
' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1427 @echo
' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1428 @echo
' 1: warnings which may be relevant and do not occur too often'
1429 @echo
' 2: warnings which occur quite often but may still be relevant'
1430 @echo
' 3: more obscure warnings, can most likely be ignored'
1431 @echo
' Multiple levels can be combined with W=12 or W=123'
1433 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
1434 @echo
'For further info see the ./README file'
1437 help-board-dirs
:= $(addprefix help-
,$(board-dirs
))
1439 help-boards
: $(help-board-dirs
)
1441 boards-per-dir
= $(sort $(notdir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/$*/*_defconfig
)))
1443 $(help-board-dirs
): help-
%:
1444 @echo
'Architecture specific targets ($(SRCARCH) $*):'
1445 @
$(if
$(boards-per-dir
), \
1446 $(foreach b
, $(boards-per-dir
), \
1447 printf
" %-24s - Build for %s\\n" $*/$(b
) $(subst _defconfig
,,$(b
));) \
1451 # Documentation targets
1452 # ---------------------------------------------------------------------------
1453 DOC_TARGETS
:= xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs linkcheckdocs
1454 PHONY
+= $(DOC_TARGETS
)
1455 $(DOC_TARGETS
): scripts_basic FORCE
1456 $(Q
)$(MAKE
) $(build
)=Documentation
$@
1458 else # KBUILD_EXTMOD
1461 # External module support.
1462 # When building external modules the kernel used as basis is considered
1463 # read-only, and no consistency checks are made and the make
1464 # system is not used on the basis kernel. If updates are required
1465 # in the basis kernel ordinary make commands (without M=...) must
1468 # The following are the only valid targets when building external
1470 # make M=dir clean Delete all automatically generated files
1471 # make M=dir modules Make all modules in specified dir
1472 # make M=dir Same as 'make M=dir modules'
1473 # make M=dir modules_install
1474 # Install the modules built in the module directory
1475 # Assumes install directory is already created
1477 # We are always building modules
1479 PHONY
+= crmodverdir
1483 PHONY
+= $(objtree
)/Module.symvers
1484 $(objtree
)/Module.symvers
:
1485 @
test -e
$(objtree
)/Module.symvers ||
( \
1487 echo
" WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1488 echo
" is missing; modules will have no dependencies and modversions."; \
1491 module-dirs
:= $(addprefix _module_
,$(KBUILD_EXTMOD
))
1492 PHONY
+= $(module-dirs
) modules
1493 $(module-dirs
): crmodverdir
$(objtree
)/Module.symvers
1494 $(Q
)$(MAKE
) $(build
)=$(patsubst _module_
%,%,$@
)
1496 modules
: $(module-dirs
)
1497 @
$(kecho
) ' Building modules, stage 2.';
1498 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1500 PHONY
+= modules_install
1501 modules_install
: _emodinst_ _emodinst_post
1503 install-dir
:= $(if
$(INSTALL_MOD_DIR
),$(INSTALL_MOD_DIR
),extra
)
1506 $(Q
)mkdir
-p
$(MODLIB
)/$(install-dir
)
1507 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1509 PHONY
+= _emodinst_post
1510 _emodinst_post
: _emodinst_
1513 clean-dirs
:= $(addprefix _clean_
,$(KBUILD_EXTMOD
))
1515 PHONY
+= $(clean-dirs
) clean
1517 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1519 clean: rm-dirs
:= $(MODVERDIR
)
1520 clean: rm-files
:= $(KBUILD_EXTMOD
)/Module.symvers
1524 @echo
' Building external modules.'
1525 @echo
' Syntax: make -C path/to/kernel/src M=$$PWD target'
1527 @echo
' modules - default target, build the module(s)'
1528 @echo
' modules_install - install the module'
1529 @echo
' clean - remove generated files in module directory only'
1533 PHONY
+= prepare scripts
1536 endif # KBUILD_EXTMOD
1538 clean: $(clean-dirs
)
1541 @find
$(if
$(KBUILD_EXTMOD
), $(KBUILD_EXTMOD
), .
) $(RCS_FIND_IGNORE
) \
1542 \
( -name
'*.[oas]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
1546 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
1547 -o
-name
'*.symtypes' -o
-name
'modules.order' \
1548 -o
-name modules.builtin
-o
-name
'.tmp_*.o.*' \
1549 -o
-name .cache.mk \
1550 -o
-name
'*.c.[012]*.*' \
1552 -o
-name
'*.gcno' \
) -type f
-print | xargs
rm -f
1554 # Generate tags for editors
1555 # ---------------------------------------------------------------------------
1556 quiet_cmd_tags
= GEN
$@
1557 cmd_tags
= $(CONFIG_SHELL
) $(srctree
)/scripts
/tags.sh
$@
1559 tags TAGS cscope gtags
: FORCE
1562 # Scripts to check various things for consistency
1563 # ---------------------------------------------------------------------------
1565 PHONY
+= includecheck versioncheck coccicheck namespacecheck export_report
1568 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1569 -name
'*.[hcS]' -type f
-print |
sort \
1570 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkincludes.pl
1573 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1574 -name
'*.[hcS]' -type f
-print |
sort \
1575 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkversion.pl
1578 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/$@
1581 $(PERL
) $(srctree
)/scripts
/namespace.pl
1584 $(PERL
) $(srctree
)/scripts
/export_report.pl
1586 endif #ifeq ($(config-targets),1)
1587 endif #ifeq ($(mixed-targets),1)
1589 PHONY
+= checkstack kernelrelease kernelversion image_name
1591 # UML needs a little special treatment here. It wants to use the host
1592 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1593 # else wants $(ARCH), including people doing cross-builds, which means
1594 # that $(SUBARCH) doesn't work here.
1596 CHECKSTACK_ARCH
:= $(SUBARCH
)
1598 CHECKSTACK_ARCH
:= $(ARCH
)
1601 $(OBJDUMP
) -d vmlinux
$$(find .
-name
'*.ko') | \
1602 $(PERL
) $(src
)/scripts
/checkstack.pl
$(CHECKSTACK_ARCH
)
1605 @echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1608 @echo
$(KERNELVERSION
)
1611 @echo
$(KBUILD_IMAGE
)
1613 # Clear a bunch of variables before executing the submake
1615 $(Q
)mkdir
-p
$(objtree
)/tools
1616 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(src
)/tools
/
1619 $(Q
)mkdir
-p
$(objtree
)/tools
1620 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(src
)/tools
/ $*
1623 # ---------------------------------------------------------------------------
1624 # Single targets are compatible with:
1625 # - build with mixed source and output
1626 # - build with separate output dir 'make O=...'
1627 # - external modules
1629 # target-dir => where to store outputfile
1630 # build-dir => directory in kernel source tree to use
1632 ifeq ($(KBUILD_EXTMOD
),)
1633 build-dir
= $(patsubst %/,%,$(dir $@
))
1634 target-dir
= $(dir $@
)
1636 zap-slash
=$(filter-out .
,$(patsubst %/,%,$(dir $@
)))
1637 build-dir
= $(KBUILD_EXTMOD
)$(if
$(zap-slash
),/$(zap-slash
))
1638 target-dir
= $(if
$(KBUILD_EXTMOD
),$(dir $<),$(dir $@
))
1641 %.s
: %.c prepare scripts FORCE
1642 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1643 %.i
: %.c prepare scripts FORCE
1644 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1645 %.o
: %.c prepare scripts FORCE
1646 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1647 %.lst
: %.c prepare scripts FORCE
1648 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1649 %.s
: %.S prepare scripts FORCE
1650 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1651 %.o
: %.S prepare scripts FORCE
1652 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1653 %.symtypes
: %.c prepare scripts FORCE
1654 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1655 %.ll
: %.c prepare scripts FORCE
1656 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1659 /: prepare scripts FORCE
1661 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1662 $(build
)=$(build-dir
)
1663 # Make sure the latest headers are built for Documentation
1664 Documentation
/ samples
/: headers_install
1665 %/: prepare scripts FORCE
1667 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1668 $(build
)=$(build-dir
)
1669 %.ko
: prepare scripts FORCE
1671 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1672 $(build
)=$(build-dir
) $(@
:.ko
=.o
)
1673 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1675 # FIXME Should go into a make.lib or something
1676 # ===========================================================================
1678 quiet_cmd_rmdirs
= $(if
$(wildcard $(rm-dirs
)),CLEAN
$(wildcard $(rm-dirs
)))
1679 cmd_rmdirs
= rm -rf
$(rm-dirs
)
1681 quiet_cmd_rmfiles
= $(if
$(wildcard $(rm-files
)),CLEAN
$(wildcard $(rm-files
)))
1682 cmd_rmfiles
= rm -f
$(rm-files
)
1684 # Run depmod only if we have System.map and depmod is executable
1685 quiet_cmd_depmod
= DEPMOD
$(KERNELRELEASE
)
1686 cmd_depmod
= $(CONFIG_SHELL
) $(srctree
)/scripts
/depmod.sh
$(DEPMOD
) \
1687 $(KERNELRELEASE
) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1689 # Create temporary dir for module support files
1690 # clean it up only when building all modules
1691 cmd_crmodverdir
= $(Q
)mkdir
-p
$(MODVERDIR
) \
1692 $(if
$(KBUILD_MODULES
),; rm -f
$(MODVERDIR
)/*)
1694 # read all saved command lines
1696 targets
:= $(wildcard $(sort $(targets
)))
1697 cmd_files
:= $(wildcard .
*.cmd
$(foreach f
,$(targets
),$(dir $(f
)).
$(notdir $(f
)).cmd
))
1699 ifneq ($(cmd_files
),)
1700 $(cmd_files
): ; # Do not try to update included dependency files
1701 include $(cmd_files
)
1704 endif # skip-makefile
1709 # Declare the contents of the .PHONY variable as phony. We keep that
1710 # information in a variable so we can use it in if_changed and friends.