1 # SPDX-License-Identifier: GPL-2.0
9 # To see a list of typical targets execute "make help"
10 # More info can be located in ./README
11 # Comments in this file are targeted only to the developer, do not
12 # expect to learn how to build the kernel reading this file.
14 # That's our default target when none is given on the command line
18 # o Do not use make's built-in rules and variables
19 # (this increases performance and avoids hard-to-debug behaviour);
20 # o Look for make include files relative to root of kernel src
21 MAKEFLAGS
+= -rR
--include-dir
=$(CURDIR
)
23 # Avoid funny character set dependencies
27 export LC_COLLATE LC_NUMERIC
29 # Avoid interference with shell env settings
32 # We are using a recursive build, so we need to do a little thinking
33 # to get the ordering right.
35 # Most importantly: sub-Makefiles should only ever modify files in
36 # their own directory. If in some directory we have a dependency on
37 # a file in another dir (which doesn't happen often, but it's often
38 # unavoidable when linking the built-in.a targets which finally
39 # turn into vmlinux), we will call a sub make in that other dir, and
40 # after that we are sure that everything which is in that other dir
43 # The only cases where we need to modify files which have global
44 # effects are thus separated out and done before the recursive
45 # descending is started. They are now explicitly listed as the
49 # ---------------------------------------------------------------------------
51 # Normally, we echo the whole command before executing it. By making
52 # that echo $($(quiet)$(cmd)), we now have the possibility to set
53 # $(quiet) to choose other forms of output instead, e.g.
55 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
56 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
58 # If $(quiet) is empty, the whole command will be printed.
59 # If it is set to "quiet_", only the short version will be printed.
60 # If it is set to "silent_", nothing will be printed at all, since
61 # the variable $(silent_cmd_cc_o_c) doesn't exist.
63 # A simple variant is to prefix commands with $(Q) - that's useful
64 # for commands that shall be hidden in non-verbose mode.
68 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
69 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
71 # To put more focus on warnings, be less verbose as default
72 # Use 'make V=1' to see the full commands
74 ifeq ("$(origin V)", "command line")
81 ifeq ($(KBUILD_VERBOSE
),1)
89 # If the user is running make -s (silent mode), suppress echoing of
92 ifneq ($(findstring s
,$(filter-out --%,$(MAKEFLAGS
))),)
97 export quiet Q KBUILD_VERBOSE
99 # kbuild supports saving output files in a separate directory.
100 # To locate output files in a separate directory two syntaxes are supported.
101 # In both cases the working directory must be the root of the kernel src.
103 # Use "make O=dir/to/store/output/files/"
105 # 2) Set KBUILD_OUTPUT
106 # Set the environment variable KBUILD_OUTPUT to point to the directory
107 # where the output files shall be placed.
108 # export KBUILD_OUTPUT=dir/to/store/output/files/
111 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
114 # KBUILD_SRC is not intended to be used by the regular user (for now),
115 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
116 ifeq ($(KBUILD_SRC
),)
118 # OK, Make called in directory where kernel src resides
119 # Do we want to locate output files in a separate directory?
120 ifeq ("$(origin O)", "command line")
121 KBUILD_OUTPUT
:= $(O
)
124 # Cancel implicit rules on top Makefile
125 $(CURDIR
)/Makefile Makefile
: ;
127 ifneq ($(words $(subst :, ,$(CURDIR
))), 1)
128 $(error main directory cannot contain spaces nor colons
)
131 ifneq ($(KBUILD_OUTPUT
),)
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
144 # Invoke a second make in the output directory, passing relevant variables
146 $(Q
)$(MAKE
) -C
$(KBUILD_OUTPUT
) KBUILD_SRC
=$(CURDIR
) \
147 -f
$(CURDIR
)/Makefile
$(filter-out _all sub-make
,$(MAKECMDGOALS
))
149 # Leave processing to above invocation of make
151 endif # ifneq ($(KBUILD_OUTPUT),)
152 endif # ifeq ($(KBUILD_SRC),)
154 # We process the rest of the Makefile if this is the final invocation of make
155 ifeq ($(skip-makefile
),)
157 # Do not print "Entering directory ...",
158 # but we want to display it when entering to the output directory
159 # so that IDEs/editors are able to understand relative filenames.
160 MAKEFLAGS
+= --no-print-directory
162 # Call a source code checker (by default, "sparse") as part of the
165 # Use 'make C=1' to enable checking of only re-compiled files.
166 # Use 'make C=2' to enable checking of *all* source files, regardless
167 # of whether they are re-compiled or not.
169 # See the file "Documentation/dev-tools/sparse.rst" for more details,
170 # including where to get the "sparse" utility.
172 ifeq ("$(origin C)", "command line")
173 KBUILD_CHECKSRC
= $(C
)
175 ifndef KBUILD_CHECKSRC
179 # Use make M=dir to specify directory of external module to build
180 # Old syntax make ... SUBDIRS=$PWD is still supported
181 # Setting the environment variable KBUILD_EXTMOD take precedence
183 KBUILD_EXTMOD ?
= $(SUBDIRS
)
186 ifeq ("$(origin M)", "command line")
187 KBUILD_EXTMOD
:= $(M
)
190 ifeq ($(KBUILD_SRC
),)
191 # building in the source tree
194 ifeq ($(KBUILD_SRC
)/,$(dir $(CURDIR
)))
195 # building in a subdirectory of the source tree
198 srctree
:= $(KBUILD_SRC
)
202 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
208 VPATH
:= $(srctree
)$(if
$(KBUILD_EXTMOD
),:$(KBUILD_EXTMOD
))
210 export srctree objtree VPATH
212 # To make sure we do not include .config for any of the *config targets
213 # catch them early, and hand them over to scripts/kconfig/Makefile
214 # It is allowed to specify more targets when calling make, including
215 # mixing *config targets and build targets.
216 # For example 'make oldconfig all'.
217 # Detect when mixed targets is specified, and make a second invocation
218 # of make so .config is not included in this case either (for *config).
220 version_h
:= include/generated
/uapi
/linux
/version.h
221 old_version_h
:= include/linux
/version.h
223 clean-targets
:= %clean mrproper cleandocs
224 no-dot-config-targets
:= $(clean-targets
) \
225 cscope gtags TAGS
tags help
% %docs
check% coccicheck \
226 $(version_h
) headers_
% archheaders archscripts \
227 kernelversion
%src-pkg
228 no-sync-config-targets
:= $(no-dot-config-targets
) install %install \
236 ifneq ($(filter $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
237 ifeq ($(filter-out $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
242 ifneq ($(filter $(no-sync-config-targets
), $(MAKECMDGOALS
)),)
243 ifeq ($(filter-out $(no-sync-config-targets
), $(MAKECMDGOALS
)),)
248 ifneq ($(KBUILD_EXTMOD
),)
252 ifeq ($(KBUILD_EXTMOD
),)
253 ifneq ($(filter config
%config
,$(MAKECMDGOALS
)),)
255 ifneq ($(words $(MAKECMDGOALS
)),1)
261 # For "make -j clean all", "make -j mrproper defconfig all", etc.
262 ifneq ($(filter $(clean-targets
),$(MAKECMDGOALS
)),)
263 ifneq ($(filter-out $(clean-targets
),$(MAKECMDGOALS
)),)
268 # install and modules_install need also be processed one by one
269 ifneq ($(filter install,$(MAKECMDGOALS
)),)
270 ifneq ($(filter modules_install
,$(MAKECMDGOALS
)),)
275 ifeq ($(mixed-targets
),1)
276 # ===========================================================================
277 # We're called with mixed targets (*config and build targets).
278 # Handle them one by one.
280 PHONY
+= $(MAKECMDGOALS
) __build_one_by_one
282 $(filter-out __build_one_by_one
, $(MAKECMDGOALS
)): __build_one_by_one
287 for i in
$(MAKECMDGOALS
); do \
288 $(MAKE
) -f
$(srctree
)/Makefile
$$i; \
293 # We need some generic definitions (do not try to remake the file).
294 scripts
/Kbuild.
include: ;
295 include scripts
/Kbuild.
include
297 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
298 KERNELRELEASE
= $(shell cat
include/config
/kernel.release
2> /dev
/null
)
299 KERNELVERSION
= $(VERSION
)$(if
$(PATCHLEVEL
),.
$(PATCHLEVEL
)$(if
$(SUBLEVEL
),.
$(SUBLEVEL
)))$(EXTRAVERSION
)
300 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
302 # SUBARCH tells the usermode build what the underlying arch is. That is set
303 # first, and if a usermode build is happening, the "ARCH=um" on the command
304 # line overrides the setting of ARCH below. If a native build is happening,
305 # then ARCH is assigned, getting whatever value it gets normally, and
306 # SUBARCH is subsequently ignored.
308 SUBARCH
:= $(shell uname
-m | sed
-e s
/i
.86/x86
/ -e s
/x86_64
/x86
/ \
309 -e s
/sun4u
/sparc64
/ \
310 -e s
/arm.
*/arm
/ -e s
/sa110
/arm
/ \
311 -e s
/s390x
/s390
/ -e s
/parisc64
/parisc
/ \
312 -e s
/ppc.
*/powerpc
/ -e s
/mips.
*/mips
/ \
313 -e s
/sh
[234].
*/sh
/ -e s
/aarch64.
*/arm64
/ \
316 # Cross compiling and selecting different set of gcc/bin-utils
317 # ---------------------------------------------------------------------------
319 # When performing cross compilation for other architectures ARCH shall be set
320 # to the target architecture. (See arch/* for the possibilities).
321 # ARCH can be set during invocation of make:
323 # Another way is to have ARCH set in the environment.
324 # The default ARCH is the host where make is executed.
326 # CROSS_COMPILE specify the prefix used for all executables used
327 # during compilation. Only gcc and related bin-utils executables
328 # are prefixed with $(CROSS_COMPILE).
329 # CROSS_COMPILE can be set on the command line
330 # make CROSS_COMPILE=ia64-linux-
331 # Alternatively CROSS_COMPILE can be set in the environment.
332 # Default value for CROSS_COMPILE is not to prefix executables
333 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
336 # Architecture as present in compile.h
337 UTS_MACHINE
:= $(ARCH
)
340 # Additional ARCH settings for x86
344 ifeq ($(ARCH
),x86_64
)
348 # Additional ARCH settings for sparc
349 ifeq ($(ARCH
),sparc32
)
352 ifeq ($(ARCH
),sparc64
)
356 # Additional ARCH settings for sh
361 KCONFIG_CONFIG ?
= .config
362 export KCONFIG_CONFIG
364 # SHELL used by kbuild
365 CONFIG_SHELL
:= $(shell if
[ -x
"$$BASH" ]; then echo
$$BASH; \
366 else if
[ -x
/bin
/bash
]; then echo
/bin
/bash
; \
367 else echo sh
; fi
; fi
)
369 HOST_LFS_CFLAGS
:= $(shell getconf LFS_CFLAGS
2>/dev
/null
)
370 HOST_LFS_LDFLAGS
:= $(shell getconf LFS_LDFLAGS
2>/dev
/null
)
371 HOST_LFS_LIBS
:= $(shell getconf LFS_LIBS
2>/dev
/null
)
375 HOSTCFLAGS
:= -Wall
-Wmissing-prototypes
-Wstrict-prototypes
-O2 \
376 -fomit-frame-pointer
-std
=gnu89
$(HOST_LFS_CFLAGS
)
377 HOSTCXXFLAGS
:= -O2
$(HOST_LFS_CFLAGS
)
378 HOSTLDFLAGS
:= $(HOST_LFS_LDFLAGS
)
379 HOST_LOADLIBES
:= $(HOST_LFS_LIBS
)
381 # Make variables (CC, etc...)
382 AS
= $(CROSS_COMPILE
)as
383 LD
= $(CROSS_COMPILE
)ld
384 CC
= $(CROSS_COMPILE
)gcc
386 AR
= $(CROSS_COMPILE
)ar
387 NM
= $(CROSS_COMPILE
)nm
388 STRIP
= $(CROSS_COMPILE
)strip
389 OBJCOPY
= $(CROSS_COMPILE
)objcopy
390 OBJDUMP
= $(CROSS_COMPILE
)objdump
394 GENKSYMS
= scripts
/genksyms
/genksyms
395 INSTALLKERNEL
:= installkernel
396 DEPMOD
= /sbin
/depmod
403 CHECKFLAGS
:= -D__linux__
-Dlinux
-D__STDC__
-Dunix
-D__unix__ \
404 -Wbitwise
-Wno-return-void
-Wno-unknown-attribute
$(CF
)
413 # Use USERINCLUDE when you must reference the UAPI directories only.
415 -I
$(srctree
)/arch
/$(SRCARCH
)/include/uapi \
416 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated
/uapi \
417 -I
$(srctree
)/include/uapi \
418 -I
$(objtree
)/include/generated
/uapi \
419 -include $(srctree
)/include/linux
/kconfig.h
421 # Use LINUXINCLUDE when you must reference the include/ directory.
422 # Needed to be compatible with the O= option
424 -I
$(srctree
)/arch
/$(SRCARCH
)/include \
425 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated \
426 $(if
$(KBUILD_SRC
), -I
$(srctree
)/include) \
427 -I
$(objtree
)/include \
430 KBUILD_AFLAGS
:= -D__ASSEMBLY__
431 KBUILD_CFLAGS
:= -Wall
-Wundef
-Wstrict-prototypes
-Wno-trigraphs \
432 -fno-strict-aliasing
-fno-common
-fshort-wchar \
433 -Werror-implicit-function-declaration \
434 -Wno-format-security \
436 KBUILD_CPPFLAGS
:= -D__KERNEL__
437 KBUILD_AFLAGS_KERNEL
:=
438 KBUILD_CFLAGS_KERNEL
:=
439 KBUILD_AFLAGS_MODULE
:= -DMODULE
440 KBUILD_CFLAGS_MODULE
:= -DMODULE
441 KBUILD_LDFLAGS_MODULE
:= -T
$(srctree
)/scripts
/module-common.lds
443 GCC_PLUGINS_CFLAGS
:=
445 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
446 export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
447 export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
448 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
450 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
451 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
452 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
453 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
454 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
455 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
456 export KBUILD_ARFLAGS
458 # When compiling out-of-tree modules, put MODVERDIR in the module
459 # tree rather than in the kernel tree. The kernel tree might
461 export MODVERDIR
:= $(if
$(KBUILD_EXTMOD
),$(firstword $(KBUILD_EXTMOD
))/).tmp_versions
463 # Files to ignore in find ... statements
465 export RCS_FIND_IGNORE
:= \
( -name SCCS
-o
-name BitKeeper
-o
-name .svn
-o \
466 -name CVS
-o
-name .
pc -o
-name .hg
-o
-name .git \
) \
468 export RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn \
469 --exclude CVS
--exclude .
pc --exclude .hg
--exclude .git
471 # ===========================================================================
472 # Rules shared between *config targets and build targets
474 # Basic helpers built in scripts/basic/
475 PHONY
+= scripts_basic
477 $(Q
)$(MAKE
) $(build
)=scripts
/basic
478 $(Q
)rm -f .tmp_quiet_recordmcount
480 # To avoid any implicit rule to kick in, define an empty command.
481 scripts
/basic
/%: scripts_basic
;
483 PHONY
+= outputmakefile
484 # outputmakefile generates a Makefile in the output directory, if using a
485 # separate output directory. This allows convenient use of make in the
488 ifneq ($(KBUILD_SRC
),)
489 $(Q
)ln
-fsn
$(srctree
) source
490 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/mkmakefile \
491 $(srctree
) $(objtree
) $(VERSION
) $(PATCHLEVEL
)
494 ifeq ($(cc-name
),clang
)
495 ifneq ($(CROSS_COMPILE
),)
496 CLANG_TARGET
:= --target
=$(notdir $(CROSS_COMPILE
:%-=%))
497 GCC_TOOLCHAIN
:= $(realpath
$(dir $(shell which
$(LD
)))/..
)
499 ifneq ($(GCC_TOOLCHAIN
),)
500 CLANG_GCC_TC
:= --gcc-toolchain
=$(GCC_TOOLCHAIN
)
502 KBUILD_CFLAGS
+= $(CLANG_TARGET
) $(CLANG_GCC_TC
)
503 KBUILD_AFLAGS
+= $(CLANG_TARGET
) $(CLANG_GCC_TC
)
504 KBUILD_CFLAGS
+= $(call cc-option
, -no-integrated-as
)
505 KBUILD_AFLAGS
+= $(call cc-option
, -no-integrated-as
)
508 RETPOLINE_CFLAGS_GCC
:= -mindirect-branch
=thunk-extern
-mindirect-branch-register
509 RETPOLINE_CFLAGS_CLANG
:= -mretpoline-external-thunk
510 RETPOLINE_CFLAGS
:= $(call cc-option
,$(RETPOLINE_CFLAGS_GCC
),$(call cc-option
,$(RETPOLINE_CFLAGS_CLANG
)))
511 export RETPOLINE_CFLAGS
513 KBUILD_CFLAGS
+= $(call cc-option
,-fno-PIE
)
514 KBUILD_AFLAGS
+= $(call cc-option
,-fno-PIE
)
516 # check for 'asm goto'
517 ifeq ($(shell $(CONFIG_SHELL
) $(srctree
)/scripts
/gcc-goto.sh
$(CC
) $(KBUILD_CFLAGS
)), y
)
518 CC_HAVE_ASM_GOTO
:= 1
519 KBUILD_CFLAGS
+= -DCC_HAVE_ASM_GOTO
520 KBUILD_AFLAGS
+= -DCC_HAVE_ASM_GOTO
523 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
524 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
525 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
526 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
527 CC_VERSION_TEXT
= $(shell $(CC
) --version | head
-n
1)
529 ifeq ($(config-targets
),1)
530 # ===========================================================================
531 # *config targets only - make sure prerequisites are updated, and descend
532 # in scripts/kconfig to make the *config target
534 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
535 # KBUILD_DEFCONFIG may point out an alternative default configuration
536 # used for 'make defconfig'
537 include arch
/$(SRCARCH
)/Makefile
538 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
540 config
: scripts_basic outputmakefile FORCE
541 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
543 %config
: scripts_basic outputmakefile FORCE
544 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
547 # ===========================================================================
548 # Build targets only - this includes vmlinux, arch specific targets, clean
549 # targets and others. In general all targets except *config targets.
551 # If building an external module we do not care about the all: rule
552 # but instead _all depend on modules
554 ifeq ($(KBUILD_EXTMOD
),)
560 # Decide whether to build built-in, modular, or both.
561 # Normally, just do built-in.
566 # If we have only "make modules", don't compile built-in objects.
567 # When we're building modules with modversions, we need to consider
568 # the built-in objects during the descend as well, in order to
569 # make sure the checksums are up to date before we record them.
571 ifeq ($(MAKECMDGOALS
),modules
)
572 KBUILD_BUILTIN
:= $(if
$(CONFIG_MODVERSIONS
),1)
575 # If we have "make <whatever> modules", compile modules
576 # in addition to whatever we do anyway.
577 # Just "make" or "make all" shall build modules as well
579 ifneq ($(filter all _all modules
,$(MAKECMDGOALS
)),)
583 ifeq ($(MAKECMDGOALS
),)
587 export KBUILD_MODULES KBUILD_BUILTIN
589 ifeq ($(KBUILD_EXTMOD
),)
590 # Objects we will link into vmlinux / subdirs we need to visit
592 drivers-y
:= drivers
/ sound
/ firmware
/
597 endif # KBUILD_EXTMOD
599 ifeq ($(dot-config
),1)
600 include include/config
/auto.conf
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 CFLAGS_GCOV
:= -fprofile-arcs
-ftest-coverage \
610 $(call cc-option
,-fno-tree-loop-im
) \
611 $(call cc-disable-warning
,maybe-uninitialized
,)
614 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
615 # values of the respective KBUILD_* variables
619 include arch
/$(SRCARCH
)/Makefile
621 ifeq ($(dot-config
),1)
622 ifeq ($(may-sync-config
),1)
623 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
624 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
625 # because some architectures define CROSS_COMPILE there.
626 -include include/config
/auto.conf.cmd
628 # To avoid any implicit rule to kick in, define an empty command
629 $(KCONFIG_CONFIG
) include/config
/auto.conf.cmd
: ;
631 # The actual configuration files used during the build are stored in
632 # include/generated/ and include/config/. Update them if .config is newer than
633 # include/config/auto.conf (which mirrors .config).
634 include/config
/%.conf
: $(KCONFIG_CONFIG
) include/config
/auto.conf.cmd
635 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile syncconfig
637 # External modules and some install targets need include/generated/autoconf.h
638 # and include/config/auto.conf but do not care if they are up-to-date.
639 # Use auto.conf to trigger the test
640 PHONY
+= include/config
/auto.conf
642 include/config
/auto.conf
:
643 $(Q
)test -e
include/generated
/autoconf.h
-a
-e
$@ ||
( \
645 echo
>&2 " ERROR: Kernel configuration is invalid."; \
646 echo
>&2 " include/generated/autoconf.h or $@ are missing.";\
647 echo
>&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
651 endif # may-sync-config
652 endif # $(dot-config)
654 KBUILD_CFLAGS
+= $(call cc-option
,-fno-delete-null-pointer-checks
,)
655 KBUILD_CFLAGS
+= $(call cc-disable-warning
,frame-address
,)
656 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-truncation
)
657 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-overflow
)
658 KBUILD_CFLAGS
+= $(call cc-disable-warning
, int-in-bool-context
)
660 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
661 KBUILD_CFLAGS
+= $(call cc-option
,-Oz
,-Os
)
662 KBUILD_CFLAGS
+= $(call cc-disable-warning
,maybe-uninitialized
,)
664 ifdef CONFIG_PROFILE_ALL_BRANCHES
665 KBUILD_CFLAGS
+= -O2
$(call cc-disable-warning
,maybe-uninitialized
,)
671 KBUILD_CFLAGS
+= $(call cc-ifversion
, -lt
, 0409, \
672 $(call cc-disable-warning
,maybe-uninitialized
,))
674 # Tell gcc to never replace conditional load with a non-conditional one
675 KBUILD_CFLAGS
+= $(call cc-option
,--param
=allow-store-data-races
=0)
677 include scripts
/Makefile.kcov
678 include scripts
/Makefile.gcc-plugins
680 ifdef CONFIG_READABLE_ASM
681 # Disable optimizations that make assembler listings hard to read.
682 # reorder blocks reorders the control in the function
683 # ipa clone creates specialized cloned functions
684 # partial inlining inlines only parts of functions
685 KBUILD_CFLAGS
+= $(call cc-option
,-fno-reorder-blocks
,) \
686 $(call cc-option
,-fno-ipa-cp-clone
,) \
687 $(call cc-option
,-fno-partial-inlining
)
690 ifneq ($(CONFIG_FRAME_WARN
),0)
691 KBUILD_CFLAGS
+= $(call cc-option
,-Wframe-larger-than
=${CONFIG_FRAME_WARN})
694 stackp-flags-
$(CONFIG_CC_HAS_STACKPROTECTOR_NONE
) := -fno-stack-protector
695 stackp-flags-
$(CONFIG_STACKPROTECTOR
) := -fstack-protector
696 stackp-flags-
$(CONFIG_STACKPROTECTOR_STRONG
) := -fstack-protector-strong
698 KBUILD_CFLAGS
+= $(stackp-flags-y
)
700 ifeq ($(cc-name
),clang
)
701 KBUILD_CPPFLAGS
+= $(call cc-option
,-Qunused-arguments
,)
702 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-invalid-specifier
)
703 KBUILD_CFLAGS
+= $(call cc-disable-warning
, gnu
)
704 KBUILD_CFLAGS
+= $(call cc-disable-warning
, address-of-packed-member
)
705 # Quiet clang warning: comparison of unsigned expression < 0 is always false
706 KBUILD_CFLAGS
+= $(call cc-disable-warning
, tautological-compare
)
707 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
708 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
709 # See modpost pattern 2
710 KBUILD_CFLAGS
+= $(call cc-option
, -mno-global-merge
,)
711 KBUILD_CFLAGS
+= $(call cc-option
, -fcatch-undefined-behavior
)
714 # These warnings generated too much noise in a regular build.
715 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
716 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-but-set-variable
)
719 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-const-variable
)
720 ifdef CONFIG_FRAME_POINTER
721 KBUILD_CFLAGS
+= -fno-omit-frame-pointer
-fno-optimize-sibling-calls
723 # Some targets (ARM with Thumb2, for example), can't be built with frame
724 # pointers. For those, we don't have FUNCTION_TRACER automatically
725 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
726 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
727 # -fomit-frame-pointer with FUNCTION_TRACER.
728 ifndef CONFIG_FUNCTION_TRACER
729 KBUILD_CFLAGS
+= -fomit-frame-pointer
733 KBUILD_CFLAGS
+= $(call cc-option
, -fno-var-tracking-assignments
)
735 ifdef CONFIG_DEBUG_INFO
736 ifdef CONFIG_DEBUG_INFO_SPLIT
737 KBUILD_CFLAGS
+= $(call cc-option
, -gsplit-dwarf
, -g
)
741 KBUILD_AFLAGS
+= -Wa
,-gdwarf-2
743 ifdef CONFIG_DEBUG_INFO_DWARF4
744 KBUILD_CFLAGS
+= $(call cc-option
, -gdwarf-4
,)
747 ifdef CONFIG_DEBUG_INFO_REDUCED
748 KBUILD_CFLAGS
+= $(call cc-option
, -femit-struct-debug-baseonly
) \
749 $(call cc-option
,-fno-var-tracking
)
752 ifdef CONFIG_FUNCTION_TRACER
753 ifndef CC_FLAGS_FTRACE
754 CC_FLAGS_FTRACE
:= -pg
756 export CC_FLAGS_FTRACE
757 ifdef CONFIG_HAVE_FENTRY
758 CC_USING_FENTRY
:= $(call cc-option
, -mfentry
-DCC_USING_FENTRY
)
760 KBUILD_CFLAGS
+= $(CC_FLAGS_FTRACE
) $(CC_USING_FENTRY
)
761 KBUILD_AFLAGS
+= $(CC_USING_FENTRY
)
762 ifdef CONFIG_DYNAMIC_FTRACE
763 ifdef CONFIG_HAVE_C_RECORDMCOUNT
764 BUILD_C_RECORDMCOUNT
:= y
765 export BUILD_C_RECORDMCOUNT
770 # We trigger additional mismatches with less inlining
771 ifdef CONFIG_DEBUG_SECTION_MISMATCH
772 KBUILD_CFLAGS
+= $(call cc-option
, -fno-inline-functions-called-once
)
775 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
776 KBUILD_CFLAGS_KERNEL
+= $(call cc-option
,-ffunction-sections
,)
777 KBUILD_CFLAGS_KERNEL
+= $(call cc-option
,-fdata-sections
,)
780 # arch Makefile may override CC so keep this after arch Makefile is included
781 NOSTDINC_FLAGS
+= -nostdinc
-isystem
$(shell $(CC
) -print-file-name
=include)
783 # warn about C99 declaration after statement
784 KBUILD_CFLAGS
+= $(call cc-option
,-Wdeclaration-after-statement
,)
786 # disable pointer signed / unsigned warnings in gcc 4.0
787 KBUILD_CFLAGS
+= $(call cc-disable-warning
, pointer-sign
)
789 # disable invalid "can't wrap" optimizations for signed / pointers
790 KBUILD_CFLAGS
+= $(call cc-option
,-fno-strict-overflow
)
792 # clang sets -fmerge-all-constants by default as optimization, but this
793 # is non-conforming behavior for C and in fact breaks the kernel, so we
794 # need to disable it here generally.
795 KBUILD_CFLAGS
+= $(call cc-option
,-fno-merge-all-constants
)
797 # for gcc -fno-merge-all-constants disables everything, but it is fine
798 # to have actual conforming behavior enabled.
799 KBUILD_CFLAGS
+= $(call cc-option
,-fmerge-constants
)
801 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
802 KBUILD_CFLAGS
+= $(call cc-option
,-fno-stack-check
,)
804 # conserve stack if available
805 KBUILD_CFLAGS
+= $(call cc-option
,-fconserve-stack
)
807 # disallow errors like 'EXPORT_GPL(foo);' with missing header
808 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=implicit-int
)
810 # require functions to have arguments in prototypes, not empty 'int foo()'
811 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=strict-prototypes
)
813 # Prohibit date/time macros, which would make the build non-deterministic
814 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=date-time
)
816 # enforce correct pointer usage
817 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=incompatible-pointer-types
)
819 # Require designated initializers for all marked structures
820 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=designated-init
)
822 # change __FILE__ to the relative path from the srctree
823 KBUILD_CFLAGS
+= $(call cc-option
,-fmacro-prefix-map
=$(srctree
)/=)
825 # use the deterministic mode of AR if available
826 KBUILD_ARFLAGS
:= $(call ar-option
,D
)
828 include scripts
/Makefile.kasan
829 include scripts
/Makefile.extrawarn
830 include scripts
/Makefile.ubsan
832 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
834 KBUILD_CPPFLAGS
+= $(ARCH_CPPFLAGS
) $(KCPPFLAGS
)
835 KBUILD_AFLAGS
+= $(ARCH_AFLAGS
) $(KAFLAGS
)
836 KBUILD_CFLAGS
+= $(ARCH_CFLAGS
) $(KCFLAGS
)
838 # Use --build-id when available.
839 LDFLAGS_BUILD_ID
:= $(call ld-option
, --build-id
)
840 KBUILD_LDFLAGS_MODULE
+= $(LDFLAGS_BUILD_ID
)
841 LDFLAGS_vmlinux
+= $(LDFLAGS_BUILD_ID
)
843 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
844 LDFLAGS_vmlinux
+= $(call ld-option
, --gc-sections
,)
847 ifeq ($(CONFIG_STRIP_ASM_SYMS
),y
)
848 LDFLAGS_vmlinux
+= $(call ld-option
, -X
,)
851 # insure the checker run with the right endianness
852 CHECKFLAGS
+= $(if
$(CONFIG_CPU_BIG_ENDIAN
),-mbig-endian
,-mlittle-endian
)
854 # the checker needs the correct machine size
855 CHECKFLAGS
+= $(if
$(CONFIG_64BIT
),-m64
,-m32
)
857 # Default kernel image to build when no specific target is given.
858 # KBUILD_IMAGE may be overruled on the command line or
859 # set in the environment
860 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
862 export KBUILD_IMAGE ?
= vmlinux
865 # INSTALL_PATH specifies where to place the updated kernel and system map
866 # images. Default is /boot, but you can set it to other values
867 export INSTALL_PATH ?
= /boot
870 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
871 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
872 # an argument if needed. Otherwise it defaults to the kernel install path
874 export INSTALL_DTBS_PATH ?
= $(INSTALL_PATH
)/dtbs
/$(KERNELRELEASE
)
877 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
878 # relocations required by build roots. This is not defined in the
879 # makefile but the argument can be passed to make if needed.
882 MODLIB
= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
886 # INSTALL_MOD_STRIP, if defined, will cause modules to be
887 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
888 # the default option --strip-debug will be used. Otherwise,
889 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
891 ifdef INSTALL_MOD_STRIP
892 ifeq ($(INSTALL_MOD_STRIP
),1)
893 mod_strip_cmd
= $(STRIP
) --strip-debug
895 mod_strip_cmd
= $(STRIP
) $(INSTALL_MOD_STRIP
)
896 endif # INSTALL_MOD_STRIP=1
899 endif # INSTALL_MOD_STRIP
902 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
903 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
904 # or CONFIG_MODULE_COMPRESS_XZ.
906 mod_compress_cmd
= true
907 ifdef CONFIG_MODULE_COMPRESS
908 ifdef CONFIG_MODULE_COMPRESS_GZIP
909 mod_compress_cmd
= gzip
-n
-f
910 endif # CONFIG_MODULE_COMPRESS_GZIP
911 ifdef CONFIG_MODULE_COMPRESS_XZ
912 mod_compress_cmd
= xz
-f
913 endif # CONFIG_MODULE_COMPRESS_XZ
914 endif # CONFIG_MODULE_COMPRESS
915 export mod_compress_cmd
917 # Select initial ramdisk compression format, default is gzip(1).
918 # This shall be used by the dracut(8) tool while creating an initramfs image.
920 INITRD_COMPRESS-y
:= gzip
921 INITRD_COMPRESS-
$(CONFIG_RD_BZIP2
) := bzip2
922 INITRD_COMPRESS-
$(CONFIG_RD_LZMA
) := lzma
923 INITRD_COMPRESS-
$(CONFIG_RD_XZ
) := xz
924 INITRD_COMPRESS-
$(CONFIG_RD_LZO
) := lzo
925 INITRD_COMPRESS-
$(CONFIG_RD_LZ4
) := lz4
926 # do not export INITRD_COMPRESS, since we didn't actually
927 # choose a sane default compression above.
928 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
930 ifdef CONFIG_MODULE_SIG_ALL
931 $(eval
$(call config_filename
,MODULE_SIG_KEY
))
933 mod_sign_cmd
= scripts
/sign-file
$(CONFIG_MODULE_SIG_HASH
) $(MODULE_SIG_KEY_SRCPREFIX
)$(CONFIG_MODULE_SIG_KEY
) certs
/signing_key.x509
939 ifdef CONFIG_STACK_VALIDATION
940 has_libelf
:= $(call try-run
,\
941 echo
"int main() {}" |
$(HOSTCC
) -xc
-o
/dev
/null
-lelf
-,1,0)
942 ifeq ($(has_libelf
),1)
943 objtool_target
:= tools
/objtool FORCE
945 ifdef CONFIG_UNWINDER_ORC
946 $(error
"Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
948 $(warning
"Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
950 SKIP_STACK_VALIDATION
:= 1
951 export SKIP_STACK_VALIDATION
956 ifeq ($(KBUILD_EXTMOD
),)
957 core-y
+= kernel
/ certs
/ mm
/ fs
/ ipc
/ security
/ crypto
/ block
/
959 vmlinux-dirs
:= $(patsubst %/,%,$(filter %/, $(init-y
) $(init-m
) \
960 $(core-y
) $(core-m
) $(drivers-y
) $(drivers-m
) \
961 $(net-y
) $(net-m
) $(libs-y
) $(libs-m
) $(virt-y
)))
963 vmlinux-alldirs
:= $(sort $(vmlinux-dirs
) $(patsubst %/,%,$(filter %/, \
964 $(init-
) $(core-
) $(drivers-
) $(net-
) $(libs-
) $(virt-
))))
966 init-y
:= $(patsubst %/, %/built-in.a
, $(init-y
))
967 core-y
:= $(patsubst %/, %/built-in.a
, $(core-y
))
968 drivers-y
:= $(patsubst %/, %/built-in.a
, $(drivers-y
))
969 net-y
:= $(patsubst %/, %/built-in.a
, $(net-y
))
970 libs-y1
:= $(patsubst %/, %/lib.a
, $(libs-y
))
971 libs-y2
:= $(patsubst %/, %/built-in.a
, $(filter-out %.a
, $(libs-y
)))
972 virt-y
:= $(patsubst %/, %/built-in.a
, $(virt-y
))
974 # Externally visible symbols (used by link-vmlinux.sh)
975 export KBUILD_VMLINUX_INIT
:= $(head-y
) $(init-y
)
976 export KBUILD_VMLINUX_MAIN
:= $(core-y
) $(libs-y2
) $(drivers-y
) $(net-y
) $(virt-y
)
977 export KBUILD_VMLINUX_LIBS
:= $(libs-y1
)
978 export KBUILD_LDS
:= arch
/$(SRCARCH
)/kernel
/vmlinux.lds
979 export LDFLAGS_vmlinux
980 # used by scripts/package/Makefile
981 export KBUILD_ALLDIRS
:= $(sort $(filter-out arch
/%,$(vmlinux-alldirs
)) arch Documentation
include samples scripts tools
)
983 vmlinux-deps
:= $(KBUILD_LDS
) $(KBUILD_VMLINUX_INIT
) $(KBUILD_VMLINUX_MAIN
) $(KBUILD_VMLINUX_LIBS
)
985 # Recurse until adjust_autoksyms.sh is satisfied
986 PHONY
+= autoksyms_recursive
987 autoksyms_recursive
: $(vmlinux-deps
)
988 ifdef CONFIG_TRIM_UNUSED_KSYMS
989 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/adjust_autoksyms.sh \
990 "$(MAKE) -f $(srctree)/Makefile vmlinux"
993 # For the kernel to actually contain only the needed exported symbols,
994 # we have to build modules as well to determine what those symbols are.
995 # (this can be evaluated only once include/config/auto.conf has been included)
996 ifdef CONFIG_TRIM_UNUSED_KSYMS
1000 autoksyms_h
:= $(if
$(CONFIG_TRIM_UNUSED_KSYMS
), include/generated
/autoksyms.h
)
1003 $(Q
)mkdir
-p
$(dir $@
)
1006 ARCH_POSTLINK
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/Makefile.postlink
)
1008 # Final link of vmlinux with optional arch pass after final link
1009 cmd_link-vmlinux
= \
1010 $(CONFIG_SHELL
) $< $(LD
) $(LDFLAGS
) $(LDFLAGS_vmlinux
) ; \
1011 $(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) $@
, true
)
1013 vmlinux
: scripts
/link-vmlinux.sh autoksyms_recursive
$(vmlinux-deps
) FORCE
1014 ifdef CONFIG_HEADERS_CHECK
1015 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile headers_check
1017 ifdef CONFIG_GDB_SCRIPTS
1018 $(Q
)ln
-fsn
$(abspath
$(srctree
)/scripts
/gdb
/vmlinux-gdb.py
)
1020 +$(call if_changed
,link-vmlinux
)
1022 # Build samples along the rest of the kernel
1023 ifdef CONFIG_SAMPLES
1024 vmlinux-dirs
+= samples
1027 # The actual objects are generated when descending,
1028 # make sure no implicit rule kicks in
1029 $(sort $(vmlinux-deps
)): $(vmlinux-dirs
) ;
1031 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1032 # Preset locale variables to speed up the build process. Limit locale
1033 # tweaks to this spot to avoid wrong language settings when running
1034 # make menuconfig etc.
1035 # Error messages still appears in the original language
1037 PHONY
+= $(vmlinux-dirs
)
1038 $(vmlinux-dirs
): prepare scripts
1039 $(Q
)$(MAKE
) $(build
)=$@ need-builtin
=1
1041 define filechk_kernel.release
1042 echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1045 # Store (new) KERNELRELEASE string in include/config/kernel.release
1046 include/config
/kernel.release
: $(srctree
)/Makefile FORCE
1047 $(call filechk
,kernel.release
)
1049 # Additional helpers built in scripts/
1050 # Carefully list dependencies so we do not try to build scripts twice
1053 scripts
: scripts_basic asm-generic gcc-plugins
$(autoksyms_h
)
1054 $(Q
)$(MAKE
) $(build
)=$(@
)
1056 # Things we need to do before we recursively start building the kernel
1057 # or the modules are listed in "prepare".
1058 # A multi level approach is used. prepareN is processed before prepareN-1.
1059 # archprepare is used in arch Makefiles and when processed asm symlink,
1060 # version.h and scripts_basic is processed / created.
1062 # Listed in dependency order
1063 PHONY
+= prepare archprepare prepare0 prepare1 prepare2 prepare3
1065 # prepare3 is used to check if we are building in a separate output directory,
1067 # 1) Check that make has not been executed in the kernel src $(srctree)
1068 prepare3
: include/config
/kernel.release
1069 ifneq ($(KBUILD_SRC
),)
1070 @
$(kecho
) ' Using $(srctree) as source for kernel'
1071 $(Q
)if
[ -f
$(srctree
)/.config
-o
-d
$(srctree
)/include/config
]; then \
1072 echo
>&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1073 echo
>&2 " in the '$(srctree)' directory.";\
1078 # prepare2 creates a makefile if using a separate output directory.
1079 # From this point forward, .config has been reprocessed, so any rules
1080 # that need to depend on updated CONFIG_* values can be checked here.
1081 prepare2
: prepare3 outputmakefile asm-generic
1083 prepare1
: prepare2
$(version_h
) $(autoksyms_h
) include/generated
/utsrelease.h
1086 archprepare
: archheaders archscripts prepare1 scripts_basic
1088 prepare0
: archprepare gcc-plugins
1089 $(Q
)$(MAKE
) $(build
)=.
1091 # All the preparing..
1092 prepare
: prepare0 prepare-objtool
1094 # Support for using generic headers in asm-generic
1095 PHONY
+= asm-generic uapi-asm-generic
1096 asm-generic
: uapi-asm-generic
1097 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.asm-generic \
1098 src
=asm obj
=arch
/$(SRCARCH
)/include/generated
/asm
1100 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.asm-generic \
1101 src
=uapi
/asm obj
=arch
/$(SRCARCH
)/include/generated
/uapi
/asm
1103 PHONY
+= prepare-objtool
1104 prepare-objtool
: $(objtool_target
)
1106 # Generate some files
1107 # ---------------------------------------------------------------------------
1109 # KERNELRELEASE can change from a few different places, meaning version.h
1110 # needs to be updated, so this check is forced on all builds
1113 define filechk_utsrelease.h
1114 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
1115 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1118 (echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1121 define filechk_version.h
1122 (echo \
#define LINUX_VERSION_CODE $(shell \
1123 expr
$(VERSION
) \
* 65536 + 0$(PATCHLEVEL
) \
* 256 + 0$(SUBLEVEL
)); \
1124 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1127 $(version_h
): $(srctree
)/Makefile FORCE
1128 $(call filechk
,version.h
)
1129 $(Q
)rm -f
$(old_version_h
)
1131 include/generated
/utsrelease.h
: include/config
/kernel.release FORCE
1132 $(call filechk
,utsrelease.h
)
1136 $(Q
)find
$(srctree
)/include/ -name
'*.h' | xargs
--max-args
1 \
1137 $(srctree
)/scripts
/headerdep.pl
-I
$(srctree
)/include
1139 # ---------------------------------------------------------------------------
1142 #Default location for installed headers
1143 export INSTALL_HDR_PATH
= $(objtree
)/usr
1145 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1146 hdr-dst
= $(if
$(KBUILD_HEADERS
), dst
=include/arch-
$(SRCARCH
), dst
=include)
1148 PHONY
+= archheaders
1151 PHONY
+= archscripts
1155 __headers
: $(version_h
) scripts_basic uapi-asm-generic archheaders archscripts
1156 $(Q
)$(MAKE
) $(build
)=scripts build_unifdef
1158 PHONY
+= headers_install_all
1159 headers_install_all
:
1160 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
install
1162 PHONY
+= headers_install
1163 headers_install
: __headers
1164 $(if
$(wildcard $(srctree
)/arch
/$(SRCARCH
)/include/uapi
/asm
/Kbuild
),, \
1165 $(error Headers not exportable for the
$(SRCARCH
) architecture
))
1166 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi dst
=include
1167 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(SRCARCH
)/include/uapi
$(hdr-dst
)
1169 PHONY
+= headers_check_all
1170 headers_check_all
: headers_install_all
1171 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
check
1173 PHONY
+= headers_check
1174 headers_check
: headers_install
1175 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi dst
=include HDRCHECK
=1
1176 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(SRCARCH
)/include/uapi
$(hdr-dst
) HDRCHECK
=1
1178 # ---------------------------------------------------------------------------
1183 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests run_tests
1185 PHONY
+= kselftest-clean
1187 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests
clean
1189 PHONY
+= kselftest-merge
1191 $(if
$(wildcard $(objtree
)/.config
),, $(error No .config exists
, config your kernel first
!))
1192 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/kconfig
/merge_config.sh \
1193 -m
$(objtree
)/.config \
1194 $(srctree
)/tools
/testing
/selftests
/*/config
1195 +$(Q
)$(MAKE
) -f
$(srctree
)/Makefile olddefconfig
1197 # ---------------------------------------------------------------------------
1200 ifdef CONFIG_MODULES
1202 # By default, build modules as well
1208 # A module can be listed more than once in obj-m resulting in
1209 # duplicate lines in modules.order files. Those are removed
1210 # using awk while concatenating to the final file.
1213 modules
: $(vmlinux-dirs
) $(if
$(KBUILD_BUILTIN
),vmlinux
) modules.builtin
1214 $(Q
)$(AWK
) '!x[$$0]++' $(vmlinux-dirs
:%=$(objtree
)/%/modules.order
) > $(objtree
)/modules.order
1215 @
$(kecho
) ' Building modules, stage 2.';
1216 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1218 modules.builtin
: $(vmlinux-dirs
:%=%/modules.builtin
)
1219 $(Q
)$(AWK
) '!x[$$0]++' $^
> $(objtree
)/modules.builtin
1221 %/modules.builtin
: include/config
/auto.conf
include/config
/tristate.conf
1222 $(Q
)$(MAKE
) $(modbuiltin
)=$*
1225 # Target to prepare building external modules
1226 PHONY
+= modules_prepare
1227 modules_prepare
: prepare scripts
1229 # Target to install modules
1230 PHONY
+= modules_install
1231 modules_install
: _modinst_ _modinst_post
1235 @
rm -rf
$(MODLIB
)/kernel
1236 @
rm -f
$(MODLIB
)/source
1237 @mkdir
-p
$(MODLIB
)/kernel
1238 @ln
-s
$(abspath
$(srctree
)) $(MODLIB
)/source
1239 @if
[ ! $(objtree
) -ef
$(MODLIB
)/build
]; then \
1240 rm -f
$(MODLIB
)/build
; \
1241 ln
-s
$(CURDIR
) $(MODLIB
)/build
; \
1243 @cp
-f
$(objtree
)/modules.order
$(MODLIB
)/
1244 @cp
-f
$(objtree
)/modules.builtin
$(MODLIB
)/
1245 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1247 # This depmod is only for convenience to give the initial
1248 # boot a modules.dep even before / is mounted read-write. However the
1249 # boot script depmod is the master version.
1250 PHONY
+= _modinst_post
1251 _modinst_post
: _modinst_
1254 ifeq ($(CONFIG_MODULE_SIG
), y
)
1255 PHONY
+= modules_sign
1257 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modsign
1260 else # CONFIG_MODULES
1262 # Modules not configured
1263 # ---------------------------------------------------------------------------
1265 PHONY
+= modules modules_install
1266 modules modules_install
:
1268 @echo
>&2 "The present kernel configuration has modules disabled."
1269 @echo
>&2 "Type 'make config' and enable loadable module support."
1270 @echo
>&2 "Then build a kernel with module support enabled."
1274 endif # CONFIG_MODULES
1277 # Cleaning is done on three levels.
1278 # make clean Delete most generated files
1279 # Leave enough to build external modules
1280 # make mrproper Delete the current configuration, and all generated files
1281 # make distclean Remove editor backup files, patch leftover files and the like
1283 # Directories & files removed with 'make clean'
1284 CLEAN_DIRS
+= $(MODVERDIR
) include/ksym
1286 # Directories & files removed with 'make mrproper'
1287 MRPROPER_DIRS
+= include/config usr
/include include/generated \
1288 arch
/*/include/generated .tmp_objdiff
1289 MRPROPER_FILES
+= .config .config.old .version \
1290 Module.symvers
tags TAGS cscope
* GPATH GTAGS GRTAGS GSYMS \
1291 signing_key.pem signing_key.priv signing_key.x509 \
1292 x509.genkey extra_certificates signing_key.x509.keyid \
1293 signing_key.x509.signer vmlinux-gdb.py
1295 # clean - Delete most, but leave enough to build external modules
1297 clean: rm-dirs
:= $(CLEAN_DIRS
)
1298 clean: rm-files
:= $(CLEAN_FILES
)
1299 clean-dirs
:= $(addprefix _clean_
, .
$(vmlinux-alldirs
) Documentation samples
)
1301 PHONY
+= $(clean-dirs
) clean archclean vmlinuxclean
1303 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1306 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/link-vmlinux.sh
clean
1307 $(Q
)$(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) clean)
1309 clean: archclean vmlinuxclean
1311 # mrproper - Delete all generated files, including .config
1313 mrproper
: rm-dirs
:= $(wildcard $(MRPROPER_DIRS
))
1314 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
1315 mrproper-dirs
:= $(addprefix _mrproper_
,scripts
)
1317 PHONY
+= $(mrproper-dirs
) mrproper archmrproper
1319 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
1321 mrproper
: clean archmrproper
$(mrproper-dirs
)
1330 @find
$(srctree
) $(RCS_FIND_IGNORE
) \
1331 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
1332 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'*%' \
1333 -o
-name
'core' \
) \
1334 -type f
-print | xargs
rm -f
1337 # Packaging of the kernel to various formats
1338 # ---------------------------------------------------------------------------
1339 # rpm target kept for backward compatibility
1340 package-dir
:= scripts
/package
1343 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1344 %pkg
: include/config
/kernel.release FORCE
1345 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1347 @echo
" WARNING: \"rpm\" target will be removed after Linux 4.18"
1348 @echo
" Please use \"rpm-pkg\" instead."
1351 # Brief documentation of the typical targets used
1352 # ---------------------------------------------------------------------------
1354 boards
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*_defconfig
)
1355 boards
:= $(sort $(notdir $(boards
)))
1356 board-dirs
:= $(dir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*/*_defconfig
))
1357 board-dirs
:= $(sort $(notdir $(board-dirs
:/=)))
1361 @echo
'Cleaning targets:'
1362 @echo
' clean - Remove most generated files but keep the config and'
1363 @echo
' enough build support to build external modules'
1364 @echo
' mrproper - Remove all generated files + config + various backup files'
1365 @echo
' distclean - mrproper + remove editor backup and patch files'
1367 @echo
'Configuration targets:'
1368 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
1370 @echo
'Other generic targets:'
1371 @echo
' all - Build all targets marked with [*]'
1372 @echo
'* vmlinux - Build the bare kernel'
1373 @echo
'* modules - Build all modules'
1374 @echo
' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1375 @echo
' dir/ - Build all files in dir and below'
1376 @echo
' dir/file.[ois] - Build specified target only'
1377 @echo
' dir/file.ll - Build the LLVM assembly file'
1378 @echo
' (requires compiler support for LLVM assembly generation)'
1379 @echo
' dir/file.lst - Build specified mixed source/assembly target only'
1380 @echo
' (requires a recent binutils and recent build (System.map))'
1381 @echo
' dir/file.ko - Build module including final link'
1382 @echo
' modules_prepare - Set up for building external modules'
1383 @echo
' tags/TAGS - Generate tags file for editors'
1384 @echo
' cscope - Generate cscope index'
1385 @echo
' gtags - Generate GNU GLOBAL index'
1386 @echo
' kernelrelease - Output the release version string (use with make -s)'
1387 @echo
' kernelversion - Output the version stored in Makefile (use with make -s)'
1388 @echo
' image_name - Output the image name (use with make -s)'
1389 @echo
' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1390 echo
' (default: $(INSTALL_HDR_PATH))'; \
1392 @echo
'Static analysers:'
1393 @echo
' checkstack - Generate a list of stack hogs'
1394 @echo
' namespacecheck - Name space analysis on compiled kernel'
1395 @echo
' versioncheck - Sanity check on version.h usage'
1396 @echo
' includecheck - Check for duplicate included header files'
1397 @echo
' export_report - List the usages of all exported symbols'
1398 @echo
' headers_check - Sanity check on exported headers'
1399 @echo
' headerdep - Detect inclusion cycles in headers'
1400 @echo
' coccicheck - Check with Coccinelle'
1402 @echo
'Kernel selftest:'
1403 @echo
' kselftest - Build and run kernel selftest (run as root)'
1404 @echo
' Build, install, and boot kernel before'
1405 @echo
' running kselftest on it'
1406 @echo
' kselftest-clean - Remove all generated kselftest files'
1407 @echo
' kselftest-merge - Merge all the config dependencies of kselftest to existing'
1410 @echo
'Userspace tools targets:'
1411 @echo
' use "make tools/help"'
1412 @echo
' or "cd tools; make help"'
1414 @echo
'Kernel packaging:'
1415 @
$(MAKE
) $(build
)=$(package-dir
) help
1417 @echo
'Documentation targets:'
1418 @
$(MAKE
) -f
$(srctree
)/Documentation
/Makefile dochelp
1420 @echo
'Architecture specific targets ($(SRCARCH)):'
1421 @
$(if
$(archhelp
),$(archhelp
),\
1422 echo
' No architecture specific help defined for $(SRCARCH)')
1425 $(foreach b
, $(boards
), \
1426 printf
" %-24s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
1428 @
$(if
$(board-dirs
), \
1429 $(foreach b
, $(board-dirs
), \
1430 printf
" %-16s - Show %s-specific targets\\n" help-
$(b
) $(b
);) \
1431 printf
" %-16s - Show all of the above\\n" help-boards
; \
1434 @echo
' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1435 @echo
' make V=2 [targets] 2 => give reason for rebuild of target'
1436 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
1437 @echo
' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1438 @echo
' make C=2 [targets] Force check of all c source with $$CHECK'
1439 @echo
' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1440 @echo
' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1441 @echo
' 1: warnings which may be relevant and do not occur too often'
1442 @echo
' 2: warnings which occur quite often but may still be relevant'
1443 @echo
' 3: more obscure warnings, can most likely be ignored'
1444 @echo
' Multiple levels can be combined with W=12 or W=123'
1446 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
1447 @echo
'For further info see the ./README file'
1450 help-board-dirs
:= $(addprefix help-
,$(board-dirs
))
1452 help-boards
: $(help-board-dirs
)
1454 boards-per-dir
= $(sort $(notdir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/$*/*_defconfig
)))
1456 $(help-board-dirs
): help-
%:
1457 @echo
'Architecture specific targets ($(SRCARCH) $*):'
1458 @
$(if
$(boards-per-dir
), \
1459 $(foreach b
, $(boards-per-dir
), \
1460 printf
" %-24s - Build for %s\\n" $*/$(b
) $(subst _defconfig
,,$(b
));) \
1464 # Documentation targets
1465 # ---------------------------------------------------------------------------
1466 DOC_TARGETS
:= xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1467 linkcheckdocs dochelp refcheckdocs
1468 PHONY
+= $(DOC_TARGETS
)
1469 $(DOC_TARGETS
): scripts_basic FORCE
1470 $(Q
)$(MAKE
) $(build
)=Documentation
$@
1472 else # KBUILD_EXTMOD
1475 # External module support.
1476 # When building external modules the kernel used as basis is considered
1477 # read-only, and no consistency checks are made and the make
1478 # system is not used on the basis kernel. If updates are required
1479 # in the basis kernel ordinary make commands (without M=...) must
1482 # The following are the only valid targets when building external
1484 # make M=dir clean Delete all automatically generated files
1485 # make M=dir modules Make all modules in specified dir
1486 # make M=dir Same as 'make M=dir modules'
1487 # make M=dir modules_install
1488 # Install the modules built in the module directory
1489 # Assumes install directory is already created
1491 # We are always building modules
1493 PHONY
+= crmodverdir
1497 PHONY
+= $(objtree
)/Module.symvers
1498 $(objtree
)/Module.symvers
:
1499 @
test -e
$(objtree
)/Module.symvers ||
( \
1501 echo
" WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1502 echo
" is missing; modules will have no dependencies and modversions."; \
1505 module-dirs
:= $(addprefix _module_
,$(KBUILD_EXTMOD
))
1506 PHONY
+= $(module-dirs
) modules
1507 $(module-dirs
): crmodverdir
$(objtree
)/Module.symvers
1508 $(Q
)$(MAKE
) $(build
)=$(patsubst _module_
%,%,$@
)
1510 modules
: $(module-dirs
)
1511 @
$(kecho
) ' Building modules, stage 2.';
1512 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1514 PHONY
+= modules_install
1515 modules_install
: _emodinst_ _emodinst_post
1517 install-dir
:= $(if
$(INSTALL_MOD_DIR
),$(INSTALL_MOD_DIR
),extra
)
1520 $(Q
)mkdir
-p
$(MODLIB
)/$(install-dir
)
1521 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1523 PHONY
+= _emodinst_post
1524 _emodinst_post
: _emodinst_
1527 clean-dirs
:= $(addprefix _clean_
,$(KBUILD_EXTMOD
))
1529 PHONY
+= $(clean-dirs
) clean
1531 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1533 clean: rm-dirs
:= $(MODVERDIR
)
1534 clean: rm-files
:= $(KBUILD_EXTMOD
)/Module.symvers
1538 @echo
' Building external modules.'
1539 @echo
' Syntax: make -C path/to/kernel/src M=$$PWD target'
1541 @echo
' modules - default target, build the module(s)'
1542 @echo
' modules_install - install the module'
1543 @echo
' clean - remove generated files in module directory only'
1547 PHONY
+= prepare scripts
1550 endif # KBUILD_EXTMOD
1552 clean: $(clean-dirs
)
1555 @find
$(if
$(KBUILD_EXTMOD
), $(KBUILD_EXTMOD
), .
) $(RCS_FIND_IGNORE
) \
1556 \
( -name
'*.[aios]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
1557 -o
-name
'*.ko.*' -o
-name
'*.dtb' -o
-name
'*.dtb.S' \
1558 -o
-name
'*.dwo' -o
-name
'*.lst' \
1560 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
1561 -o
-name
'*.lex.c' -o
-name
'*.tab.[ch]' \
1562 -o
-name
'*.asn1.[ch]' \
1563 -o
-name
'*.symtypes' -o
-name
'modules.order' \
1564 -o
-name modules.builtin
-o
-name
'.tmp_*.o.*' \
1565 -o
-name
'*.c.[012]*.*' \
1567 -o
-name
'*.gcno' \
) -type f
-print | xargs
rm -f
1569 # Generate tags for editors
1570 # ---------------------------------------------------------------------------
1571 quiet_cmd_tags
= GEN
$@
1572 cmd_tags
= $(CONFIG_SHELL
) $(srctree
)/scripts
/tags.sh
$@
1574 tags TAGS cscope gtags
: FORCE
1577 # Scripts to check various things for consistency
1578 # ---------------------------------------------------------------------------
1580 PHONY
+= includecheck versioncheck coccicheck namespacecheck export_report
1583 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1584 -name
'*.[hcS]' -type f
-print |
sort \
1585 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkincludes.pl
1588 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1589 -name
'*.[hcS]' -type f
-print |
sort \
1590 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkversion.pl
1593 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/$@
1596 $(PERL
) $(srctree
)/scripts
/namespace.pl
1599 $(PERL
) $(srctree
)/scripts
/export_report.pl
1601 endif #ifeq ($(config-targets),1)
1602 endif #ifeq ($(mixed-targets),1)
1604 PHONY
+= checkstack kernelrelease kernelversion image_name
1606 # UML needs a little special treatment here. It wants to use the host
1607 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1608 # else wants $(ARCH), including people doing cross-builds, which means
1609 # that $(SUBARCH) doesn't work here.
1611 CHECKSTACK_ARCH
:= $(SUBARCH
)
1613 CHECKSTACK_ARCH
:= $(ARCH
)
1616 $(OBJDUMP
) -d vmlinux
$$(find .
-name
'*.ko') | \
1617 $(PERL
) $(src
)/scripts
/checkstack.pl
$(CHECKSTACK_ARCH
)
1620 @echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1623 @echo
$(KERNELVERSION
)
1626 @echo
$(KBUILD_IMAGE
)
1628 # Clear a bunch of variables before executing the submake
1630 $(Q
)mkdir
-p
$(objtree
)/tools
1631 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(src
)/tools
/
1634 $(Q
)mkdir
-p
$(objtree
)/tools
1635 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(src
)/tools
/ $*
1638 # ---------------------------------------------------------------------------
1639 # Single targets are compatible with:
1640 # - build with mixed source and output
1641 # - build with separate output dir 'make O=...'
1642 # - external modules
1644 # target-dir => where to store outputfile
1645 # build-dir => directory in kernel source tree to use
1647 ifeq ($(KBUILD_EXTMOD
),)
1648 build-dir
= $(patsubst %/,%,$(dir $@
))
1649 target-dir
= $(dir $@
)
1651 zap-slash
=$(filter-out .
,$(patsubst %/,%,$(dir $@
)))
1652 build-dir
= $(KBUILD_EXTMOD
)$(if
$(zap-slash
),/$(zap-slash
))
1653 target-dir
= $(if
$(KBUILD_EXTMOD
),$(dir $<),$(dir $@
))
1656 %.s
: %.c prepare scripts FORCE
1657 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1658 %.i
: %.c prepare scripts FORCE
1659 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1660 %.o
: %.c prepare scripts FORCE
1661 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1662 %.lst
: %.c prepare scripts FORCE
1663 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1664 %.s
: %.S prepare scripts FORCE
1665 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1666 %.o
: %.S prepare scripts FORCE
1667 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1668 %.symtypes
: %.c prepare scripts FORCE
1669 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1670 %.ll
: %.c prepare scripts FORCE
1671 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1674 /: prepare scripts FORCE
1676 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1677 $(build
)=$(build-dir
)
1678 # Make sure the latest headers are built for Documentation
1679 Documentation
/ samples
/: headers_install
1680 %/: prepare scripts FORCE
1682 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1683 $(build
)=$(build-dir
)
1684 %.ko
: prepare scripts FORCE
1686 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1687 $(build
)=$(build-dir
) $(@
:.ko
=.o
)
1688 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1690 # FIXME Should go into a make.lib or something
1691 # ===========================================================================
1693 quiet_cmd_rmdirs
= $(if
$(wildcard $(rm-dirs
)),CLEAN
$(wildcard $(rm-dirs
)))
1694 cmd_rmdirs
= rm -rf
$(rm-dirs
)
1696 quiet_cmd_rmfiles
= $(if
$(wildcard $(rm-files
)),CLEAN
$(wildcard $(rm-files
)))
1697 cmd_rmfiles
= rm -f
$(rm-files
)
1699 # Run depmod only if we have System.map and depmod is executable
1700 quiet_cmd_depmod
= DEPMOD
$(KERNELRELEASE
)
1701 cmd_depmod
= $(CONFIG_SHELL
) $(srctree
)/scripts
/depmod.sh
$(DEPMOD
) \
1704 # Create temporary dir for module support files
1705 # clean it up only when building all modules
1706 cmd_crmodverdir
= $(Q
)mkdir
-p
$(MODVERDIR
) \
1707 $(if
$(KBUILD_MODULES
),; rm -f
$(MODVERDIR
)/*)
1709 # read all saved command lines
1711 cmd_files
:= $(wildcard .
*.cmd
$(foreach f
,$(sort $(targets
)),$(dir $(f
)).
$(notdir $(f
)).cmd
))
1713 ifneq ($(cmd_files
),)
1714 $(cmd_files
): ; # Do not try to update included dependency files
1715 include $(cmd_files
)
1718 endif # skip-makefile
1723 # Declare the contents of the PHONY variable as phony. We keep that
1724 # information in a variable so we can use it in if_changed and friends.