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 # Do not use make's built-in rules and variables
19 # (this increases performance and avoids hard-to-debug behaviour)
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.a 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 KBUILD_OUTPUT
:= $(shell mkdir
-p
$(KBUILD_OUTPUT
) && cd
$(KBUILD_OUTPUT
) \
135 $(if
$(KBUILD_OUTPUT
),, \
136 $(error failed to create output directory
"$(saved-output)"))
138 # Look for make include files relative to root of kernel src
140 # This does not become effective immediately because MAKEFLAGS is re-parsed
141 # once after the Makefile is read. It is OK since we are going to invoke
143 MAKEFLAGS
+= --include-dir
=$(CURDIR
)
145 PHONY
+= $(MAKECMDGOALS
) sub-make
147 $(filter-out _all sub-make
$(CURDIR
)/Makefile
, $(MAKECMDGOALS
)) _all
: sub-make
150 # Invoke a second make in the output directory, passing relevant variables
152 $(Q
)$(MAKE
) -C
$(KBUILD_OUTPUT
) KBUILD_SRC
=$(CURDIR
) \
153 -f
$(CURDIR
)/Makefile
$(filter-out _all sub-make
,$(MAKECMDGOALS
))
155 # Leave processing to above invocation of make
157 endif # ifneq ($(KBUILD_OUTPUT),)
158 endif # ifeq ($(KBUILD_SRC),)
160 # We process the rest of the Makefile if this is the final invocation of make
161 ifeq ($(skip-makefile
),)
163 # Do not print "Entering directory ...",
164 # but we want to display it when entering to the output directory
165 # so that IDEs/editors are able to understand relative filenames.
166 MAKEFLAGS
+= --no-print-directory
168 # Call a source code checker (by default, "sparse") as part of the
171 # Use 'make C=1' to enable checking of only re-compiled files.
172 # Use 'make C=2' to enable checking of *all* source files, regardless
173 # of whether they are re-compiled or not.
175 # See the file "Documentation/dev-tools/sparse.rst" for more details,
176 # including where to get the "sparse" utility.
178 ifeq ("$(origin C)", "command line")
179 KBUILD_CHECKSRC
= $(C
)
181 ifndef KBUILD_CHECKSRC
185 # Use make M=dir to specify directory of external module to build
186 # Old syntax make ... SUBDIRS=$PWD is still supported
187 # Setting the environment variable KBUILD_EXTMOD take precedence
189 KBUILD_EXTMOD ?
= $(SUBDIRS
)
192 ifeq ("$(origin M)", "command line")
193 KBUILD_EXTMOD
:= $(M
)
196 ifeq ($(KBUILD_SRC
),)
197 # building in the source tree
200 ifeq ($(KBUILD_SRC
)/,$(dir $(CURDIR
)))
201 # building in a subdirectory of the source tree
204 srctree
:= $(KBUILD_SRC
)
208 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
214 VPATH
:= $(srctree
)$(if
$(KBUILD_EXTMOD
),:$(KBUILD_EXTMOD
))
216 export srctree objtree VPATH
218 # To make sure we do not include .config for any of the *config targets
219 # catch them early, and hand them over to scripts/kconfig/Makefile
220 # It is allowed to specify more targets when calling make, including
221 # mixing *config targets and build targets.
222 # For example 'make oldconfig all'.
223 # Detect when mixed targets is specified, and make a second invocation
224 # of make so .config is not included in this case either (for *config).
226 version_h
:= include/generated
/uapi
/linux
/version.h
227 old_version_h
:= include/linux
/version.h
229 clean-targets
:= %clean mrproper cleandocs
230 no-dot-config-targets
:= $(clean-targets
) \
231 cscope gtags TAGS
tags help
% %docs
check% coccicheck \
232 $(version_h
) headers_
% archheaders archscripts \
233 %asm-generic kernelversion
%src-pkg
234 no-sync-config-targets
:= $(no-dot-config-targets
) install %install \
242 ifneq ($(filter $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
243 ifeq ($(filter-out $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
248 ifneq ($(filter $(no-sync-config-targets
), $(MAKECMDGOALS
)),)
249 ifeq ($(filter-out $(no-sync-config-targets
), $(MAKECMDGOALS
)),)
254 ifneq ($(KBUILD_EXTMOD
),)
258 ifeq ($(KBUILD_EXTMOD
),)
259 ifneq ($(filter config
%config
,$(MAKECMDGOALS
)),)
261 ifneq ($(words $(MAKECMDGOALS
)),1)
267 # For "make -j clean all", "make -j mrproper defconfig all", etc.
268 ifneq ($(filter $(clean-targets
),$(MAKECMDGOALS
)),)
269 ifneq ($(filter-out $(clean-targets
),$(MAKECMDGOALS
)),)
274 # install and modules_install need also be processed one by one
275 ifneq ($(filter install,$(MAKECMDGOALS
)),)
276 ifneq ($(filter modules_install
,$(MAKECMDGOALS
)),)
281 ifeq ($(mixed-targets
),1)
282 # ===========================================================================
283 # We're called with mixed targets (*config and build targets).
284 # Handle them one by one.
286 PHONY
+= $(MAKECMDGOALS
) __build_one_by_one
288 $(filter-out __build_one_by_one
, $(MAKECMDGOALS
)): __build_one_by_one
293 for i in
$(MAKECMDGOALS
); do \
294 $(MAKE
) -f
$(srctree
)/Makefile
$$i; \
299 # We need some generic definitions (do not try to remake the file).
300 scripts
/Kbuild.
include: ;
301 include scripts
/Kbuild.
include
303 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
304 KERNELRELEASE
= $(shell cat
include/config
/kernel.release
2> /dev
/null
)
305 KERNELVERSION
= $(VERSION
)$(if
$(PATCHLEVEL
),.
$(PATCHLEVEL
)$(if
$(SUBLEVEL
),.
$(SUBLEVEL
)))$(EXTRAVERSION
)
306 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
308 # SUBARCH tells the usermode build what the underlying arch is. That is set
309 # first, and if a usermode build is happening, the "ARCH=um" on the command
310 # line overrides the setting of ARCH below. If a native build is happening,
311 # then ARCH is assigned, getting whatever value it gets normally, and
312 # SUBARCH is subsequently ignored.
314 SUBARCH
:= $(shell uname
-m | sed
-e s
/i
.86/x86
/ -e s
/x86_64
/x86
/ \
315 -e s
/sun4u
/sparc64
/ \
316 -e s
/arm.
*/arm
/ -e s
/sa110
/arm
/ \
317 -e s
/s390x
/s390
/ -e s
/parisc64
/parisc
/ \
318 -e s
/ppc.
*/powerpc
/ -e s
/mips.
*/mips
/ \
319 -e s
/sh
[234].
*/sh
/ -e s
/aarch64.
*/arm64
/ \
322 # Cross compiling and selecting different set of gcc/bin-utils
323 # ---------------------------------------------------------------------------
325 # When performing cross compilation for other architectures ARCH shall be set
326 # to the target architecture. (See arch/* for the possibilities).
327 # ARCH can be set during invocation of make:
329 # Another way is to have ARCH set in the environment.
330 # The default ARCH is the host where make is executed.
332 # CROSS_COMPILE specify the prefix used for all executables used
333 # during compilation. Only gcc and related bin-utils executables
334 # are prefixed with $(CROSS_COMPILE).
335 # CROSS_COMPILE can be set on the command line
336 # make CROSS_COMPILE=ia64-linux-
337 # Alternatively CROSS_COMPILE can be set in the environment.
338 # Default value for CROSS_COMPILE is not to prefix executables
339 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
342 # Architecture as present in compile.h
343 UTS_MACHINE
:= $(ARCH
)
346 # Additional ARCH settings for x86
350 ifeq ($(ARCH
),x86_64
)
354 # Additional ARCH settings for sparc
355 ifeq ($(ARCH
),sparc32
)
358 ifeq ($(ARCH
),sparc64
)
362 # Additional ARCH settings for sh
367 KCONFIG_CONFIG ?
= .config
368 export KCONFIG_CONFIG
370 # SHELL used by kbuild
371 CONFIG_SHELL
:= $(shell if
[ -x
"$$BASH" ]; then echo
$$BASH; \
372 else if
[ -x
/bin
/bash
]; then echo
/bin
/bash
; \
373 else echo sh
; fi
; fi
)
375 HOST_LFS_CFLAGS
:= $(shell getconf LFS_CFLAGS
2>/dev
/null
)
376 HOST_LFS_LDFLAGS
:= $(shell getconf LFS_LDFLAGS
2>/dev
/null
)
377 HOST_LFS_LIBS
:= $(shell getconf LFS_LIBS
2>/dev
/null
)
381 KBUILD_HOSTCFLAGS
:= -Wall
-Wmissing-prototypes
-Wstrict-prototypes
-O2 \
382 -fomit-frame-pointer
-std
=gnu89
$(HOST_LFS_CFLAGS
) \
384 KBUILD_HOSTCXXFLAGS
:= -O2
$(HOST_LFS_CFLAGS
) $(HOSTCXXFLAGS
)
385 KBUILD_HOSTLDFLAGS
:= $(HOST_LFS_LDFLAGS
) $(HOSTLDFLAGS
)
386 KBUILD_HOSTLDLIBS
:= $(HOST_LFS_LIBS
) $(HOSTLDLIBS
)
388 # Make variables (CC, etc...)
389 AS
= $(CROSS_COMPILE
)as
390 LD
= $(CROSS_COMPILE
)ld
391 CC
= $(CROSS_COMPILE
)gcc
393 AR
= $(CROSS_COMPILE
)ar
394 NM
= $(CROSS_COMPILE
)nm
395 STRIP
= $(CROSS_COMPILE
)strip
396 OBJCOPY
= $(CROSS_COMPILE
)objcopy
397 OBJDUMP
= $(CROSS_COMPILE
)objdump
401 GENKSYMS
= scripts
/genksyms
/genksyms
402 INSTALLKERNEL
:= installkernel
403 DEPMOD
= /sbin
/depmod
410 CHECKFLAGS
:= -D__linux__
-Dlinux
-D__STDC__
-Dunix
-D__unix__ \
411 -Wbitwise
-Wno-return-void
-Wno-unknown-attribute
$(CF
)
420 # Use USERINCLUDE when you must reference the UAPI directories only.
422 -I
$(srctree
)/arch
/$(SRCARCH
)/include/uapi \
423 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated
/uapi \
424 -I
$(srctree
)/include/uapi \
425 -I
$(objtree
)/include/generated
/uapi \
426 -include $(srctree
)/include/linux
/kconfig.h
428 # Use LINUXINCLUDE when you must reference the include/ directory.
429 # Needed to be compatible with the O= option
431 -I
$(srctree
)/arch
/$(SRCARCH
)/include \
432 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated \
433 $(if
$(KBUILD_SRC
), -I
$(srctree
)/include) \
434 -I
$(objtree
)/include \
437 KBUILD_AFLAGS
:= -D__ASSEMBLY__
438 KBUILD_CFLAGS
:= -Wall
-Wundef
-Wstrict-prototypes
-Wno-trigraphs \
439 -fno-strict-aliasing
-fno-common
-fshort-wchar \
440 -Werror-implicit-function-declaration \
441 -Wno-format-security \
443 KBUILD_CPPFLAGS
:= -D__KERNEL__
444 KBUILD_AFLAGS_KERNEL
:=
445 KBUILD_CFLAGS_KERNEL
:=
446 KBUILD_AFLAGS_MODULE
:= -DMODULE
447 KBUILD_CFLAGS_MODULE
:= -DMODULE
448 KBUILD_LDFLAGS_MODULE
:= -T
$(srctree
)/scripts
/module-common.lds
450 GCC_PLUGINS_CFLAGS
:=
452 export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
453 export CPP AR NM STRIP OBJCOPY OBJDUMP KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
454 export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
455 export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
457 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
458 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
459 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
460 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
461 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
462 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
463 export KBUILD_ARFLAGS
465 # When compiling out-of-tree modules, put MODVERDIR in the module
466 # tree rather than in the kernel tree. The kernel tree might
468 export MODVERDIR
:= $(if
$(KBUILD_EXTMOD
),$(firstword $(KBUILD_EXTMOD
))/).tmp_versions
470 # Files to ignore in find ... statements
472 export RCS_FIND_IGNORE
:= \
( -name SCCS
-o
-name BitKeeper
-o
-name .svn
-o \
473 -name CVS
-o
-name .
pc -o
-name .hg
-o
-name .git \
) \
475 export RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn \
476 --exclude CVS
--exclude .
pc --exclude .hg
--exclude .git
478 # ===========================================================================
479 # Rules shared between *config targets and build targets
481 # Basic helpers built in scripts/basic/
482 PHONY
+= scripts_basic
484 $(Q
)$(MAKE
) $(build
)=scripts
/basic
485 $(Q
)rm -f .tmp_quiet_recordmcount
487 # To avoid any implicit rule to kick in, define an empty command.
488 scripts
/basic
/%: scripts_basic
;
490 PHONY
+= outputmakefile
491 # outputmakefile generates a Makefile in the output directory, if using a
492 # separate output directory. This allows convenient use of make in the
495 ifneq ($(KBUILD_SRC
),)
496 $(Q
)ln
-fsn
$(srctree
) source
497 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/mkmakefile
$(srctree
)
500 ifeq ($(cc-name
),clang
)
501 ifneq ($(CROSS_COMPILE
),)
502 CLANG_TARGET
:= --target
=$(notdir $(CROSS_COMPILE
:%-=%))
503 GCC_TOOLCHAIN
:= $(realpath
$(dir $(shell which
$(LD
)))/..
)
505 ifneq ($(GCC_TOOLCHAIN
),)
506 CLANG_GCC_TC
:= --gcc-toolchain
=$(GCC_TOOLCHAIN
)
508 KBUILD_CFLAGS
+= $(CLANG_TARGET
) $(CLANG_GCC_TC
)
509 KBUILD_AFLAGS
+= $(CLANG_TARGET
) $(CLANG_GCC_TC
)
510 KBUILD_CFLAGS
+= $(call cc-option
, -no-integrated-as
)
511 KBUILD_AFLAGS
+= $(call cc-option
, -no-integrated-as
)
514 RETPOLINE_CFLAGS_GCC
:= -mindirect-branch
=thunk-extern
-mindirect-branch-register
515 RETPOLINE_VDSO_CFLAGS_GCC
:= -mindirect-branch
=thunk-inline
-mindirect-branch-register
516 RETPOLINE_CFLAGS_CLANG
:= -mretpoline-external-thunk
517 RETPOLINE_VDSO_CFLAGS_CLANG
:= -mretpoline
518 RETPOLINE_CFLAGS
:= $(call cc-option
,$(RETPOLINE_CFLAGS_GCC
),$(call cc-option
,$(RETPOLINE_CFLAGS_CLANG
)))
519 RETPOLINE_VDSO_CFLAGS
:= $(call cc-option
,$(RETPOLINE_VDSO_CFLAGS_GCC
),$(call cc-option
,$(RETPOLINE_VDSO_CFLAGS_CLANG
)))
520 export RETPOLINE_CFLAGS
521 export RETPOLINE_VDSO_CFLAGS
523 KBUILD_CFLAGS
+= $(call cc-option
,-fno-PIE
)
524 KBUILD_AFLAGS
+= $(call cc-option
,-fno-PIE
)
526 # check for 'asm goto'
527 ifeq ($(shell $(CONFIG_SHELL
) $(srctree
)/scripts
/gcc-goto.sh
$(CC
) $(KBUILD_CFLAGS
)), y
)
528 CC_HAVE_ASM_GOTO
:= 1
529 KBUILD_CFLAGS
+= -DCC_HAVE_ASM_GOTO
530 KBUILD_AFLAGS
+= -DCC_HAVE_ASM_GOTO
533 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
534 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
535 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
536 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
537 CC_VERSION_TEXT
= $(shell $(CC
) --version | head
-n
1)
539 ifeq ($(config-targets
),1)
540 # ===========================================================================
541 # *config targets only - make sure prerequisites are updated, and descend
542 # in scripts/kconfig to make the *config target
544 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
545 # KBUILD_DEFCONFIG may point out an alternative default configuration
546 # used for 'make defconfig'
547 include arch
/$(SRCARCH
)/Makefile
548 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
550 config
: scripts_basic outputmakefile FORCE
551 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
553 %config
: scripts_basic outputmakefile FORCE
554 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
557 # ===========================================================================
558 # Build targets only - this includes vmlinux, arch specific targets, clean
559 # targets and others. In general all targets except *config targets.
561 # If building an external module we do not care about the all: rule
562 # but instead _all depend on modules
564 ifeq ($(KBUILD_EXTMOD
),)
570 # Decide whether to build built-in, modular, or both.
571 # Normally, just do built-in.
576 # If we have only "make modules", don't compile built-in objects.
577 # When we're building modules with modversions, we need to consider
578 # the built-in objects during the descend as well, in order to
579 # make sure the checksums are up to date before we record them.
581 ifeq ($(MAKECMDGOALS
),modules
)
582 KBUILD_BUILTIN
:= $(if
$(CONFIG_MODVERSIONS
),1)
585 # If we have "make <whatever> modules", compile modules
586 # in addition to whatever we do anyway.
587 # Just "make" or "make all" shall build modules as well
589 ifneq ($(filter all _all modules
,$(MAKECMDGOALS
)),)
593 ifeq ($(MAKECMDGOALS
),)
597 export KBUILD_MODULES KBUILD_BUILTIN
599 ifeq ($(KBUILD_EXTMOD
),)
600 # Objects we will link into vmlinux / subdirs we need to visit
602 drivers-y
:= drivers
/ sound
/ firmware
/
607 endif # KBUILD_EXTMOD
609 ifeq ($(dot-config
),1)
610 include include/config
/auto.conf
613 # The all: target is the default when no target is given on the
615 # This allow a user to issue only 'make' to build a kernel including modules
616 # Defaults to vmlinux, but the arch makefile usually adds further targets
619 CFLAGS_GCOV
:= -fprofile-arcs
-ftest-coverage \
620 $(call cc-option
,-fno-tree-loop-im
) \
621 $(call cc-disable-warning
,maybe-uninitialized
,)
624 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
625 # values of the respective KBUILD_* variables
629 include arch
/$(SRCARCH
)/Makefile
631 ifeq ($(dot-config
),1)
632 ifeq ($(may-sync-config
),1)
633 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
634 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
635 # because some architectures define CROSS_COMPILE there.
636 -include include/config
/auto.conf.cmd
638 # To avoid any implicit rule to kick in, define an empty command
639 $(KCONFIG_CONFIG
) include/config
/auto.conf.cmd
: ;
641 # The actual configuration files used during the build are stored in
642 # include/generated/ and include/config/. Update them if .config is newer than
643 # include/config/auto.conf (which mirrors .config).
644 include/config
/%.conf
: $(KCONFIG_CONFIG
) include/config
/auto.conf.cmd
645 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile syncconfig
647 # External modules and some install targets need include/generated/autoconf.h
648 # and include/config/auto.conf but do not care if they are up-to-date.
649 # Use auto.conf to trigger the test
650 PHONY
+= include/config
/auto.conf
652 include/config
/auto.conf
:
653 $(Q
)test -e
include/generated
/autoconf.h
-a
-e
$@ ||
( \
655 echo
>&2 " ERROR: Kernel configuration is invalid."; \
656 echo
>&2 " include/generated/autoconf.h or $@ are missing.";\
657 echo
>&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
661 endif # may-sync-config
662 endif # $(dot-config)
664 KBUILD_CFLAGS
+= $(call cc-option
,-fno-delete-null-pointer-checks
,)
665 KBUILD_CFLAGS
+= $(call cc-disable-warning
,frame-address
,)
666 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-truncation
)
667 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-overflow
)
668 KBUILD_CFLAGS
+= $(call cc-disable-warning
, int-in-bool-context
)
670 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
671 KBUILD_CFLAGS
+= $(call cc-option
,-Oz
,-Os
)
672 KBUILD_CFLAGS
+= $(call cc-disable-warning
,maybe-uninitialized
,)
674 ifdef CONFIG_PROFILE_ALL_BRANCHES
675 KBUILD_CFLAGS
+= -O2
$(call cc-disable-warning
,maybe-uninitialized
,)
681 KBUILD_CFLAGS
+= $(call cc-ifversion
, -lt
, 0409, \
682 $(call cc-disable-warning
,maybe-uninitialized
,))
684 # Tell gcc to never replace conditional load with a non-conditional one
685 KBUILD_CFLAGS
+= $(call cc-option
,--param
=allow-store-data-races
=0)
687 include scripts
/Makefile.kcov
688 include scripts
/Makefile.gcc-plugins
690 ifdef CONFIG_READABLE_ASM
691 # Disable optimizations that make assembler listings hard to read.
692 # reorder blocks reorders the control in the function
693 # ipa clone creates specialized cloned functions
694 # partial inlining inlines only parts of functions
695 KBUILD_CFLAGS
+= $(call cc-option
,-fno-reorder-blocks
,) \
696 $(call cc-option
,-fno-ipa-cp-clone
,) \
697 $(call cc-option
,-fno-partial-inlining
)
700 ifneq ($(CONFIG_FRAME_WARN
),0)
701 KBUILD_CFLAGS
+= $(call cc-option
,-Wframe-larger-than
=${CONFIG_FRAME_WARN})
704 stackp-flags-
$(CONFIG_CC_HAS_STACKPROTECTOR_NONE
) := -fno-stack-protector
705 stackp-flags-
$(CONFIG_STACKPROTECTOR
) := -fstack-protector
706 stackp-flags-
$(CONFIG_STACKPROTECTOR_STRONG
) := -fstack-protector-strong
708 KBUILD_CFLAGS
+= $(stackp-flags-y
)
710 ifeq ($(cc-name
),clang
)
711 KBUILD_CPPFLAGS
+= $(call cc-option
,-Qunused-arguments
,)
712 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-invalid-specifier
)
713 KBUILD_CFLAGS
+= $(call cc-disable-warning
, gnu
)
714 KBUILD_CFLAGS
+= $(call cc-disable-warning
, address-of-packed-member
)
715 # Quiet clang warning: comparison of unsigned expression < 0 is always false
716 KBUILD_CFLAGS
+= $(call cc-disable-warning
, tautological-compare
)
717 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
718 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
719 # See modpost pattern 2
720 KBUILD_CFLAGS
+= $(call cc-option
, -mno-global-merge
,)
721 KBUILD_CFLAGS
+= $(call cc-option
, -fcatch-undefined-behavior
)
724 # These warnings generated too much noise in a regular build.
725 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
726 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-but-set-variable
)
729 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-const-variable
)
730 ifdef CONFIG_FRAME_POINTER
731 KBUILD_CFLAGS
+= -fno-omit-frame-pointer
-fno-optimize-sibling-calls
733 # Some targets (ARM with Thumb2, for example), can't be built with frame
734 # pointers. For those, we don't have FUNCTION_TRACER automatically
735 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
736 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
737 # -fomit-frame-pointer with FUNCTION_TRACER.
738 ifndef CONFIG_FUNCTION_TRACER
739 KBUILD_CFLAGS
+= -fomit-frame-pointer
743 KBUILD_CFLAGS
+= $(call cc-option
, -fno-var-tracking-assignments
)
745 ifdef CONFIG_DEBUG_INFO
746 ifdef CONFIG_DEBUG_INFO_SPLIT
747 KBUILD_CFLAGS
+= $(call cc-option
, -gsplit-dwarf
, -g
)
751 KBUILD_AFLAGS
+= -Wa
,-gdwarf-2
753 ifdef CONFIG_DEBUG_INFO_DWARF4
754 KBUILD_CFLAGS
+= $(call cc-option
, -gdwarf-4
,)
757 ifdef CONFIG_DEBUG_INFO_REDUCED
758 KBUILD_CFLAGS
+= $(call cc-option
, -femit-struct-debug-baseonly
) \
759 $(call cc-option
,-fno-var-tracking
)
762 ifdef CONFIG_FUNCTION_TRACER
763 ifndef CC_FLAGS_FTRACE
764 CC_FLAGS_FTRACE
:= -pg
766 ifdef CONFIG_FTRACE_MCOUNT_RECORD
767 # gcc 5 supports generating the mcount tables directly
768 ifeq ($(call cc-option-yn
,-mrecord-mcount
),y
)
769 CC_FLAGS_FTRACE
+= -mrecord-mcount
770 export CC_USING_RECORD_MCOUNT
:= 1
772 ifdef CONFIG_HAVE_NOP_MCOUNT
773 ifeq ($(call cc-option-yn
, -mnop-mcount
),y
)
774 CC_FLAGS_FTRACE
+= -mnop-mcount
775 CC_FLAGS_USING
+= -DCC_USING_NOP_MCOUNT
779 ifdef CONFIG_HAVE_FENTRY
780 ifeq ($(call cc-option-yn
, -mfentry
),y
)
781 CC_FLAGS_FTRACE
+= -mfentry
782 CC_FLAGS_USING
+= -DCC_USING_FENTRY
785 export CC_FLAGS_FTRACE
786 KBUILD_CFLAGS
+= $(CC_FLAGS_FTRACE
) $(CC_FLAGS_USING
)
787 KBUILD_AFLAGS
+= $(CC_FLAGS_USING
)
788 ifdef CONFIG_DYNAMIC_FTRACE
789 ifdef CONFIG_HAVE_C_RECORDMCOUNT
790 BUILD_C_RECORDMCOUNT
:= y
791 export BUILD_C_RECORDMCOUNT
796 # We trigger additional mismatches with less inlining
797 ifdef CONFIG_DEBUG_SECTION_MISMATCH
798 KBUILD_CFLAGS
+= $(call cc-option
, -fno-inline-functions-called-once
)
801 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
802 KBUILD_CFLAGS_KERNEL
+= -ffunction-sections
-fdata-sections
803 LDFLAGS_vmlinux
+= --gc-sections
806 # arch Makefile may override CC so keep this after arch Makefile is included
807 NOSTDINC_FLAGS
+= -nostdinc
-isystem
$(shell $(CC
) -print-file-name
=include)
809 # warn about C99 declaration after statement
810 KBUILD_CFLAGS
+= -Wdeclaration-after-statement
812 # disable pointer signed / unsigned warnings in gcc 4.0
813 KBUILD_CFLAGS
+= -Wno-pointer-sign
815 # disable stringop warnings in gcc 8+
816 KBUILD_CFLAGS
+= $(call cc-disable-warning
, stringop-truncation
)
818 # disable invalid "can't wrap" optimizations for signed / pointers
819 KBUILD_CFLAGS
+= $(call cc-option
,-fno-strict-overflow
)
821 # clang sets -fmerge-all-constants by default as optimization, but this
822 # is non-conforming behavior for C and in fact breaks the kernel, so we
823 # need to disable it here generally.
824 KBUILD_CFLAGS
+= $(call cc-option
,-fno-merge-all-constants
)
826 # for gcc -fno-merge-all-constants disables everything, but it is fine
827 # to have actual conforming behavior enabled.
828 KBUILD_CFLAGS
+= $(call cc-option
,-fmerge-constants
)
830 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
831 KBUILD_CFLAGS
+= $(call cc-option
,-fno-stack-check
,)
833 # conserve stack if available
834 KBUILD_CFLAGS
+= $(call cc-option
,-fconserve-stack
)
836 # disallow errors like 'EXPORT_GPL(foo);' with missing header
837 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=implicit-int
)
839 # require functions to have arguments in prototypes, not empty 'int foo()'
840 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=strict-prototypes
)
842 # Prohibit date/time macros, which would make the build non-deterministic
843 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=date-time
)
845 # enforce correct pointer usage
846 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=incompatible-pointer-types
)
848 # Require designated initializers for all marked structures
849 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=designated-init
)
851 # change __FILE__ to the relative path from the srctree
852 KBUILD_CFLAGS
+= $(call cc-option
,-fmacro-prefix-map
=$(srctree
)/=)
854 # use the deterministic mode of AR if available
855 KBUILD_ARFLAGS
:= $(call ar-option
,D
)
857 include scripts
/Makefile.kasan
858 include scripts
/Makefile.extrawarn
859 include scripts
/Makefile.ubsan
861 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
863 KBUILD_CPPFLAGS
+= $(ARCH_CPPFLAGS
) $(KCPPFLAGS
)
864 KBUILD_AFLAGS
+= $(ARCH_AFLAGS
) $(KAFLAGS
)
865 KBUILD_CFLAGS
+= $(ARCH_CFLAGS
) $(KCFLAGS
)
867 # Use --build-id when available.
868 LDFLAGS_BUILD_ID
:= $(call ld-option
, --build-id
)
869 KBUILD_LDFLAGS_MODULE
+= $(LDFLAGS_BUILD_ID
)
870 LDFLAGS_vmlinux
+= $(LDFLAGS_BUILD_ID
)
872 ifeq ($(CONFIG_STRIP_ASM_SYMS
),y
)
873 LDFLAGS_vmlinux
+= $(call ld-option
, -X
,)
876 # insure the checker run with the right endianness
877 CHECKFLAGS
+= $(if
$(CONFIG_CPU_BIG_ENDIAN
),-mbig-endian
,-mlittle-endian
)
879 # the checker needs the correct machine size
880 CHECKFLAGS
+= $(if
$(CONFIG_64BIT
),-m64
,-m32
)
882 # Default kernel image to build when no specific target is given.
883 # KBUILD_IMAGE may be overruled on the command line or
884 # set in the environment
885 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
887 export KBUILD_IMAGE ?
= vmlinux
890 # INSTALL_PATH specifies where to place the updated kernel and system map
891 # images. Default is /boot, but you can set it to other values
892 export INSTALL_PATH ?
= /boot
895 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
896 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
897 # an argument if needed. Otherwise it defaults to the kernel install path
899 export INSTALL_DTBS_PATH ?
= $(INSTALL_PATH
)/dtbs
/$(KERNELRELEASE
)
902 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
903 # relocations required by build roots. This is not defined in the
904 # makefile but the argument can be passed to make if needed.
907 MODLIB
= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
911 # INSTALL_MOD_STRIP, if defined, will cause modules to be
912 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
913 # the default option --strip-debug will be used. Otherwise,
914 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
916 ifdef INSTALL_MOD_STRIP
917 ifeq ($(INSTALL_MOD_STRIP
),1)
918 mod_strip_cmd
= $(STRIP
) --strip-debug
920 mod_strip_cmd
= $(STRIP
) $(INSTALL_MOD_STRIP
)
921 endif # INSTALL_MOD_STRIP=1
924 endif # INSTALL_MOD_STRIP
927 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
928 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
929 # or CONFIG_MODULE_COMPRESS_XZ.
931 mod_compress_cmd
= true
932 ifdef CONFIG_MODULE_COMPRESS
933 ifdef CONFIG_MODULE_COMPRESS_GZIP
934 mod_compress_cmd
= gzip
-n
-f
935 endif # CONFIG_MODULE_COMPRESS_GZIP
936 ifdef CONFIG_MODULE_COMPRESS_XZ
937 mod_compress_cmd
= xz
-f
938 endif # CONFIG_MODULE_COMPRESS_XZ
939 endif # CONFIG_MODULE_COMPRESS
940 export mod_compress_cmd
942 # Select initial ramdisk compression format, default is gzip(1).
943 # This shall be used by the dracut(8) tool while creating an initramfs image.
945 INITRD_COMPRESS-y
:= gzip
946 INITRD_COMPRESS-
$(CONFIG_RD_BZIP2
) := bzip2
947 INITRD_COMPRESS-
$(CONFIG_RD_LZMA
) := lzma
948 INITRD_COMPRESS-
$(CONFIG_RD_XZ
) := xz
949 INITRD_COMPRESS-
$(CONFIG_RD_LZO
) := lzo
950 INITRD_COMPRESS-
$(CONFIG_RD_LZ4
) := lz4
951 # do not export INITRD_COMPRESS, since we didn't actually
952 # choose a sane default compression above.
953 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
955 ifdef CONFIG_MODULE_SIG_ALL
956 $(eval
$(call config_filename
,MODULE_SIG_KEY
))
958 mod_sign_cmd
= scripts
/sign-file
$(CONFIG_MODULE_SIG_HASH
) $(MODULE_SIG_KEY_SRCPREFIX
)$(CONFIG_MODULE_SIG_KEY
) certs
/signing_key.x509
964 ifdef CONFIG_STACK_VALIDATION
965 has_libelf
:= $(call try-run
,\
966 echo
"int main() {}" |
$(HOSTCC
) -xc
-o
/dev
/null
-lelf
-,1,0)
967 ifeq ($(has_libelf
),1)
968 objtool_target
:= tools
/objtool FORCE
970 ifdef CONFIG_UNWINDER_ORC
971 $(error
"Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
973 $(warning
"Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
975 SKIP_STACK_VALIDATION
:= 1
976 export SKIP_STACK_VALIDATION
981 ifeq ($(KBUILD_EXTMOD
),)
982 core-y
+= kernel
/ certs
/ mm
/ fs
/ ipc
/ security
/ crypto
/ block
/
984 vmlinux-dirs
:= $(patsubst %/,%,$(filter %/, $(init-y
) $(init-m
) \
985 $(core-y
) $(core-m
) $(drivers-y
) $(drivers-m
) \
986 $(net-y
) $(net-m
) $(libs-y
) $(libs-m
) $(virt-y
)))
988 vmlinux-alldirs
:= $(sort $(vmlinux-dirs
) $(patsubst %/,%,$(filter %/, \
989 $(init-
) $(core-
) $(drivers-
) $(net-
) $(libs-
) $(virt-
))))
991 init-y
:= $(patsubst %/, %/built-in.a
, $(init-y
))
992 core-y
:= $(patsubst %/, %/built-in.a
, $(core-y
))
993 drivers-y
:= $(patsubst %/, %/built-in.a
, $(drivers-y
))
994 net-y
:= $(patsubst %/, %/built-in.a
, $(net-y
))
995 libs-y1
:= $(patsubst %/, %/lib.a
, $(libs-y
))
996 libs-y2
:= $(patsubst %/, %/built-in.a
, $(filter-out %.a
, $(libs-y
)))
997 virt-y
:= $(patsubst %/, %/built-in.a
, $(virt-y
))
999 # Externally visible symbols (used by link-vmlinux.sh)
1000 export KBUILD_VMLINUX_INIT
:= $(head-y
) $(init-y
)
1001 export KBUILD_VMLINUX_MAIN
:= $(core-y
) $(libs-y2
) $(drivers-y
) $(net-y
) $(virt-y
)
1002 export KBUILD_VMLINUX_LIBS
:= $(libs-y1
)
1003 export KBUILD_LDS
:= arch
/$(SRCARCH
)/kernel
/vmlinux.lds
1004 export LDFLAGS_vmlinux
1005 # used by scripts/package/Makefile
1006 export KBUILD_ALLDIRS
:= $(sort $(filter-out arch
/%,$(vmlinux-alldirs
)) arch Documentation
include samples scripts tools
)
1008 vmlinux-deps
:= $(KBUILD_LDS
) $(KBUILD_VMLINUX_INIT
) $(KBUILD_VMLINUX_MAIN
) $(KBUILD_VMLINUX_LIBS
)
1010 # Recurse until adjust_autoksyms.sh is satisfied
1011 PHONY
+= autoksyms_recursive
1012 autoksyms_recursive
: $(vmlinux-deps
)
1013 ifdef CONFIG_TRIM_UNUSED_KSYMS
1014 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/adjust_autoksyms.sh \
1015 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1018 # For the kernel to actually contain only the needed exported symbols,
1019 # we have to build modules as well to determine what those symbols are.
1020 # (this can be evaluated only once include/config/auto.conf has been included)
1021 ifdef CONFIG_TRIM_UNUSED_KSYMS
1025 autoksyms_h
:= $(if
$(CONFIG_TRIM_UNUSED_KSYMS
), include/generated
/autoksyms.h
)
1028 $(Q
)mkdir
-p
$(dir $@
)
1031 ARCH_POSTLINK
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/Makefile.postlink
)
1033 # Final link of vmlinux with optional arch pass after final link
1034 cmd_link-vmlinux
= \
1035 $(CONFIG_SHELL
) $< $(LD
) $(KBUILD_LDFLAGS
) $(LDFLAGS_vmlinux
) ; \
1036 $(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) $@
, true
)
1038 vmlinux
: scripts
/link-vmlinux.sh autoksyms_recursive
$(vmlinux-deps
) FORCE
1039 ifdef CONFIG_HEADERS_CHECK
1040 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile headers_check
1042 ifdef CONFIG_GDB_SCRIPTS
1043 $(Q
)ln
-fsn
$(abspath
$(srctree
)/scripts
/gdb
/vmlinux-gdb.py
)
1045 +$(call if_changed
,link-vmlinux
)
1047 # Build samples along the rest of the kernel. This needs headers_install.
1048 ifdef CONFIG_SAMPLES
1049 vmlinux-dirs
+= samples
1050 samples
: headers_install
1053 # The actual objects are generated when descending,
1054 # make sure no implicit rule kicks in
1055 $(sort $(vmlinux-deps
)): $(vmlinux-dirs
) ;
1057 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1058 # Preset locale variables to speed up the build process. Limit locale
1059 # tweaks to this spot to avoid wrong language settings when running
1060 # make menuconfig etc.
1061 # Error messages still appears in the original language
1063 PHONY
+= $(vmlinux-dirs
)
1064 $(vmlinux-dirs
): prepare scripts
1065 $(Q
)$(MAKE
) $(build
)=$@ need-builtin
=1
1067 define filechk_kernel.release
1068 echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1071 # Store (new) KERNELRELEASE string in include/config/kernel.release
1072 include/config
/kernel.release
: $(srctree
)/Makefile FORCE
1073 $(call filechk
,kernel.release
)
1075 # Additional helpers built in scripts/
1076 # Carefully list dependencies so we do not try to build scripts twice
1079 scripts
: scripts_basic asm-generic gcc-plugins
$(autoksyms_h
)
1080 $(Q
)$(MAKE
) $(build
)=$(@
)
1082 # Things we need to do before we recursively start building the kernel
1083 # or the modules are listed in "prepare".
1084 # A multi level approach is used. prepareN is processed before prepareN-1.
1085 # archprepare is used in arch Makefiles and when processed asm symlink,
1086 # version.h and scripts_basic is processed / created.
1088 # Listed in dependency order
1089 PHONY
+= prepare archprepare prepare0 prepare1 prepare2 prepare3
1091 # prepare3 is used to check if we are building in a separate output directory,
1093 # 1) Check that make has not been executed in the kernel src $(srctree)
1094 prepare3
: include/config
/kernel.release
1095 ifneq ($(KBUILD_SRC
),)
1096 @
$(kecho
) ' Using $(srctree) as source for kernel'
1097 $(Q
)if
[ -f
$(srctree
)/.config
-o
-d
$(srctree
)/include/config
]; then \
1098 echo
>&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1099 echo
>&2 " in the '$(srctree)' directory.";\
1104 # prepare2 creates a makefile if using a separate output directory.
1105 # From this point forward, .config has been reprocessed, so any rules
1106 # that need to depend on updated CONFIG_* values can be checked here.
1107 prepare2
: prepare3 outputmakefile asm-generic
1109 prepare1
: prepare2
$(version_h
) $(autoksyms_h
) include/generated
/utsrelease.h
1112 archprepare
: archheaders archscripts prepare1 scripts_basic
1114 prepare0
: archprepare gcc-plugins
1115 $(Q
)$(MAKE
) $(build
)=.
1117 # All the preparing..
1118 prepare
: prepare0 prepare-objtool
1120 # Support for using generic headers in asm-generic
1121 PHONY
+= asm-generic uapi-asm-generic
1122 asm-generic
: uapi-asm-generic
1123 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.asm-generic \
1124 src
=asm obj
=arch
/$(SRCARCH
)/include/generated
/asm
1126 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.asm-generic \
1127 src
=uapi
/asm obj
=arch
/$(SRCARCH
)/include/generated
/uapi
/asm
1129 PHONY
+= prepare-objtool
1130 prepare-objtool
: $(objtool_target
)
1132 # Generate some files
1133 # ---------------------------------------------------------------------------
1135 # KERNELRELEASE can change from a few different places, meaning version.h
1136 # needs to be updated, so this check is forced on all builds
1139 define filechk_utsrelease.h
1140 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
1141 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1144 (echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1147 define filechk_version.h
1148 (echo \
#define LINUX_VERSION_CODE $(shell \
1149 expr
$(VERSION
) \
* 65536 + 0$(PATCHLEVEL
) \
* 256 + 0$(SUBLEVEL
)); \
1150 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1154 $(call filechk
,version.h
)
1155 $(Q
)rm -f
$(old_version_h
)
1157 include/generated
/utsrelease.h
: include/config
/kernel.release FORCE
1158 $(call filechk
,utsrelease.h
)
1162 $(Q
)find
$(srctree
)/include/ -name
'*.h' | xargs
--max-args
1 \
1163 $(srctree
)/scripts
/headerdep.pl
-I
$(srctree
)/include
1165 # ---------------------------------------------------------------------------
1168 #Default location for installed headers
1169 export INSTALL_HDR_PATH
= $(objtree
)/usr
1171 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1172 hdr-dst
= $(if
$(KBUILD_HEADERS
), dst
=include/arch-
$(SRCARCH
), dst
=include)
1174 PHONY
+= archheaders
1177 PHONY
+= archscripts
1181 __headers
: $(version_h
) scripts_basic uapi-asm-generic archheaders archscripts
1182 $(Q
)$(MAKE
) $(build
)=scripts build_unifdef
1184 PHONY
+= headers_install_all
1185 headers_install_all
:
1186 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
install
1188 PHONY
+= headers_install
1189 headers_install
: __headers
1190 $(if
$(wildcard $(srctree
)/arch
/$(SRCARCH
)/include/uapi
/asm
/Kbuild
),, \
1191 $(error Headers not exportable for the
$(SRCARCH
) architecture
))
1192 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi dst
=include
1193 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(SRCARCH
)/include/uapi
$(hdr-dst
)
1195 PHONY
+= headers_check_all
1196 headers_check_all
: headers_install_all
1197 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
check
1199 PHONY
+= headers_check
1200 headers_check
: headers_install
1201 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi dst
=include HDRCHECK
=1
1202 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(SRCARCH
)/include/uapi
$(hdr-dst
) HDRCHECK
=1
1204 # ---------------------------------------------------------------------------
1209 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests run_tests
1211 PHONY
+= kselftest-clean
1213 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests
clean
1215 PHONY
+= kselftest-merge
1217 $(if
$(wildcard $(objtree
)/.config
),, $(error No .config exists
, config your kernel first
!))
1218 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/kconfig
/merge_config.sh \
1219 -m
$(objtree
)/.config \
1220 $(srctree
)/tools
/testing
/selftests
/*/config
1221 +$(Q
)$(MAKE
) -f
$(srctree
)/Makefile olddefconfig
1223 # ---------------------------------------------------------------------------
1226 ifdef CONFIG_MODULES
1228 # By default, build modules as well
1234 # A module can be listed more than once in obj-m resulting in
1235 # duplicate lines in modules.order files. Those are removed
1236 # using awk while concatenating to the final file.
1239 modules
: $(vmlinux-dirs
) $(if
$(KBUILD_BUILTIN
),vmlinux
) modules.builtin
1240 $(Q
)$(AWK
) '!x[$$0]++' $(vmlinux-dirs
:%=$(objtree
)/%/modules.order
) > $(objtree
)/modules.order
1241 @
$(kecho
) ' Building modules, stage 2.';
1242 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1244 modules.builtin
: $(vmlinux-dirs
:%=%/modules.builtin
)
1245 $(Q
)$(AWK
) '!x[$$0]++' $^
> $(objtree
)/modules.builtin
1247 %/modules.builtin
: include/config
/auto.conf
include/config
/tristate.conf
1248 $(Q
)$(MAKE
) $(modbuiltin
)=$*
1251 # Target to prepare building external modules
1252 PHONY
+= modules_prepare
1253 modules_prepare
: prepare scripts
1255 # Target to install modules
1256 PHONY
+= modules_install
1257 modules_install
: _modinst_ _modinst_post
1261 @
rm -rf
$(MODLIB
)/kernel
1262 @
rm -f
$(MODLIB
)/source
1263 @mkdir
-p
$(MODLIB
)/kernel
1264 @ln
-s
$(abspath
$(srctree
)) $(MODLIB
)/source
1265 @if
[ ! $(objtree
) -ef
$(MODLIB
)/build
]; then \
1266 rm -f
$(MODLIB
)/build
; \
1267 ln
-s
$(CURDIR
) $(MODLIB
)/build
; \
1269 @cp
-f
$(objtree
)/modules.order
$(MODLIB
)/
1270 @cp
-f
$(objtree
)/modules.builtin
$(MODLIB
)/
1271 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1273 # This depmod is only for convenience to give the initial
1274 # boot a modules.dep even before / is mounted read-write. However the
1275 # boot script depmod is the master version.
1276 PHONY
+= _modinst_post
1277 _modinst_post
: _modinst_
1280 ifeq ($(CONFIG_MODULE_SIG
), y
)
1281 PHONY
+= modules_sign
1283 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modsign
1286 else # CONFIG_MODULES
1288 # Modules not configured
1289 # ---------------------------------------------------------------------------
1291 PHONY
+= modules modules_install
1292 modules modules_install
:
1294 @echo
>&2 "The present kernel configuration has modules disabled."
1295 @echo
>&2 "Type 'make config' and enable loadable module support."
1296 @echo
>&2 "Then build a kernel with module support enabled."
1300 endif # CONFIG_MODULES
1303 # Cleaning is done on three levels.
1304 # make clean Delete most generated files
1305 # Leave enough to build external modules
1306 # make mrproper Delete the current configuration, and all generated files
1307 # make distclean Remove editor backup files, patch leftover files and the like
1309 # Directories & files removed with 'make clean'
1310 CLEAN_DIRS
+= $(MODVERDIR
) include/ksym
1312 # Directories & files removed with 'make mrproper'
1313 MRPROPER_DIRS
+= include/config usr
/include include/generated \
1314 arch
/*/include/generated .tmp_objdiff
1315 MRPROPER_FILES
+= .config .config.old .version \
1316 Module.symvers
tags TAGS cscope
* GPATH GTAGS GRTAGS GSYMS \
1317 signing_key.pem signing_key.priv signing_key.x509 \
1318 x509.genkey extra_certificates signing_key.x509.keyid \
1319 signing_key.x509.signer vmlinux-gdb.py
1321 # clean - Delete most, but leave enough to build external modules
1323 clean: rm-dirs
:= $(CLEAN_DIRS
)
1324 clean: rm-files
:= $(CLEAN_FILES
)
1325 clean-dirs
:= $(addprefix _clean_
, .
$(vmlinux-alldirs
) Documentation samples
)
1327 PHONY
+= $(clean-dirs
) clean archclean vmlinuxclean
1329 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1332 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/link-vmlinux.sh
clean
1333 $(Q
)$(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) clean)
1335 clean: archclean vmlinuxclean
1337 # mrproper - Delete all generated files, including .config
1339 mrproper
: rm-dirs
:= $(wildcard $(MRPROPER_DIRS
))
1340 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
1341 mrproper-dirs
:= $(addprefix _mrproper_
,scripts
)
1343 PHONY
+= $(mrproper-dirs
) mrproper archmrproper
1345 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
1347 mrproper
: clean archmrproper
$(mrproper-dirs
)
1356 @find
$(srctree
) $(RCS_FIND_IGNORE
) \
1357 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
1358 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'*%' \
1359 -o
-name
'core' \
) \
1360 -type f
-print | xargs
rm -f
1363 # Packaging of the kernel to various formats
1364 # ---------------------------------------------------------------------------
1365 package-dir
:= scripts
/package
1368 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1369 %pkg
: include/config
/kernel.release FORCE
1370 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1373 # Brief documentation of the typical targets used
1374 # ---------------------------------------------------------------------------
1376 boards
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*_defconfig
)
1377 boards
:= $(sort $(notdir $(boards
)))
1378 board-dirs
:= $(dir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*/*_defconfig
))
1379 board-dirs
:= $(sort $(notdir $(board-dirs
:/=)))
1383 @echo
'Cleaning targets:'
1384 @echo
' clean - Remove most generated files but keep the config and'
1385 @echo
' enough build support to build external modules'
1386 @echo
' mrproper - Remove all generated files + config + various backup files'
1387 @echo
' distclean - mrproper + remove editor backup and patch files'
1389 @echo
'Configuration targets:'
1390 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
1392 @echo
'Other generic targets:'
1393 @echo
' all - Build all targets marked with [*]'
1394 @echo
'* vmlinux - Build the bare kernel'
1395 @echo
'* modules - Build all modules'
1396 @echo
' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1397 @echo
' dir/ - Build all files in dir and below'
1398 @echo
' dir/file.[ois] - Build specified target only'
1399 @echo
' dir/file.ll - Build the LLVM assembly file'
1400 @echo
' (requires compiler support for LLVM assembly generation)'
1401 @echo
' dir/file.lst - Build specified mixed source/assembly target only'
1402 @echo
' (requires a recent binutils and recent build (System.map))'
1403 @echo
' dir/file.ko - Build module including final link'
1404 @echo
' modules_prepare - Set up for building external modules'
1405 @echo
' tags/TAGS - Generate tags file for editors'
1406 @echo
' cscope - Generate cscope index'
1407 @echo
' gtags - Generate GNU GLOBAL index'
1408 @echo
' kernelrelease - Output the release version string (use with make -s)'
1409 @echo
' kernelversion - Output the version stored in Makefile (use with make -s)'
1410 @echo
' image_name - Output the image name (use with make -s)'
1411 @echo
' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1412 echo
' (default: $(INSTALL_HDR_PATH))'; \
1414 @echo
'Static analysers:'
1415 @echo
' checkstack - Generate a list of stack hogs'
1416 @echo
' namespacecheck - Name space analysis on compiled kernel'
1417 @echo
' versioncheck - Sanity check on version.h usage'
1418 @echo
' includecheck - Check for duplicate included header files'
1419 @echo
' export_report - List the usages of all exported symbols'
1420 @echo
' headers_check - Sanity check on exported headers'
1421 @echo
' headerdep - Detect inclusion cycles in headers'
1422 @echo
' coccicheck - Check with Coccinelle'
1424 @echo
'Kernel selftest:'
1425 @echo
' kselftest - Build and run kernel selftest (run as root)'
1426 @echo
' Build, install, and boot kernel before'
1427 @echo
' running kselftest on it'
1428 @echo
' kselftest-clean - Remove all generated kselftest files'
1429 @echo
' kselftest-merge - Merge all the config dependencies of kselftest to existing'
1432 @echo
'Userspace tools targets:'
1433 @echo
' use "make tools/help"'
1434 @echo
' or "cd tools; make help"'
1436 @echo
'Kernel packaging:'
1437 @
$(MAKE
) $(build
)=$(package-dir
) help
1439 @echo
'Documentation targets:'
1440 @
$(MAKE
) -f
$(srctree
)/Documentation
/Makefile dochelp
1442 @echo
'Architecture specific targets ($(SRCARCH)):'
1443 @
$(if
$(archhelp
),$(archhelp
),\
1444 echo
' No architecture specific help defined for $(SRCARCH)')
1447 $(foreach b
, $(boards
), \
1448 printf
" %-24s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
1450 @
$(if
$(board-dirs
), \
1451 $(foreach b
, $(board-dirs
), \
1452 printf
" %-16s - Show %s-specific targets\\n" help-
$(b
) $(b
);) \
1453 printf
" %-16s - Show all of the above\\n" help-boards
; \
1456 @echo
' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1457 @echo
' make V=2 [targets] 2 => give reason for rebuild of target'
1458 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
1459 @echo
' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1460 @echo
' make C=2 [targets] Force check of all c source with $$CHECK'
1461 @echo
' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1462 @echo
' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1463 @echo
' 1: warnings which may be relevant and do not occur too often'
1464 @echo
' 2: warnings which occur quite often but may still be relevant'
1465 @echo
' 3: more obscure warnings, can most likely be ignored'
1466 @echo
' Multiple levels can be combined with W=12 or W=123'
1468 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
1469 @echo
'For further info see the ./README file'
1472 help-board-dirs
:= $(addprefix help-
,$(board-dirs
))
1474 help-boards
: $(help-board-dirs
)
1476 boards-per-dir
= $(sort $(notdir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/$*/*_defconfig
)))
1478 $(help-board-dirs
): help-
%:
1479 @echo
'Architecture specific targets ($(SRCARCH) $*):'
1480 @
$(if
$(boards-per-dir
), \
1481 $(foreach b
, $(boards-per-dir
), \
1482 printf
" %-24s - Build for %s\\n" $*/$(b
) $(subst _defconfig
,,$(b
));) \
1486 # Documentation targets
1487 # ---------------------------------------------------------------------------
1488 DOC_TARGETS
:= xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1489 linkcheckdocs dochelp refcheckdocs
1490 PHONY
+= $(DOC_TARGETS
)
1491 $(DOC_TARGETS
): scripts_basic FORCE
1492 $(Q
)$(MAKE
) $(build
)=Documentation
$@
1494 else # KBUILD_EXTMOD
1497 # External module support.
1498 # When building external modules the kernel used as basis is considered
1499 # read-only, and no consistency checks are made and the make
1500 # system is not used on the basis kernel. If updates are required
1501 # in the basis kernel ordinary make commands (without M=...) must
1504 # The following are the only valid targets when building external
1506 # make M=dir clean Delete all automatically generated files
1507 # make M=dir modules Make all modules in specified dir
1508 # make M=dir Same as 'make M=dir modules'
1509 # make M=dir modules_install
1510 # Install the modules built in the module directory
1511 # Assumes install directory is already created
1513 # We are always building modules
1515 PHONY
+= crmodverdir
1519 PHONY
+= $(objtree
)/Module.symvers
1520 $(objtree
)/Module.symvers
:
1521 @
test -e
$(objtree
)/Module.symvers ||
( \
1523 echo
" WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1524 echo
" is missing; modules will have no dependencies and modversions."; \
1527 module-dirs
:= $(addprefix _module_
,$(KBUILD_EXTMOD
))
1528 PHONY
+= $(module-dirs
) modules
1529 $(module-dirs
): crmodverdir
$(objtree
)/Module.symvers
1530 $(Q
)$(MAKE
) $(build
)=$(patsubst _module_
%,%,$@
)
1532 modules
: $(module-dirs
)
1533 @
$(kecho
) ' Building modules, stage 2.';
1534 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1536 PHONY
+= modules_install
1537 modules_install
: _emodinst_ _emodinst_post
1539 install-dir
:= $(if
$(INSTALL_MOD_DIR
),$(INSTALL_MOD_DIR
),extra
)
1542 $(Q
)mkdir
-p
$(MODLIB
)/$(install-dir
)
1543 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1545 PHONY
+= _emodinst_post
1546 _emodinst_post
: _emodinst_
1549 clean-dirs
:= $(addprefix _clean_
,$(KBUILD_EXTMOD
))
1551 PHONY
+= $(clean-dirs
) clean
1553 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1555 clean: rm-dirs
:= $(MODVERDIR
)
1556 clean: rm-files
:= $(KBUILD_EXTMOD
)/Module.symvers
1560 @echo
' Building external modules.'
1561 @echo
' Syntax: make -C path/to/kernel/src M=$$PWD target'
1563 @echo
' modules - default target, build the module(s)'
1564 @echo
' modules_install - install the module'
1565 @echo
' clean - remove generated files in module directory only'
1569 PHONY
+= prepare scripts
1572 endif # KBUILD_EXTMOD
1574 clean: $(clean-dirs
)
1577 @find
$(if
$(KBUILD_EXTMOD
), $(KBUILD_EXTMOD
), .
) $(RCS_FIND_IGNORE
) \
1578 \
( -name
'*.[aios]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
1579 -o
-name
'*.ko.*' -o
-name
'*.dtb' -o
-name
'*.dtb.S' \
1580 -o
-name
'*.dwo' -o
-name
'*.lst' \
1582 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
1583 -o
-name
'*.lex.c' -o
-name
'*.tab.[ch]' \
1584 -o
-name
'*.asn1.[ch]' \
1585 -o
-name
'*.symtypes' -o
-name
'modules.order' \
1586 -o
-name modules.builtin
-o
-name
'.tmp_*.o.*' \
1587 -o
-name
'*.c.[012]*.*' \
1589 -o
-name
'*.gcno' \
) -type f
-print | xargs
rm -f
1591 # Generate tags for editors
1592 # ---------------------------------------------------------------------------
1593 quiet_cmd_tags
= GEN
$@
1594 cmd_tags
= $(CONFIG_SHELL
) $(srctree
)/scripts
/tags.sh
$@
1596 tags TAGS cscope gtags
: FORCE
1599 # Scripts to check various things for consistency
1600 # ---------------------------------------------------------------------------
1602 PHONY
+= includecheck versioncheck coccicheck namespacecheck export_report
1605 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1606 -name
'*.[hcS]' -type f
-print |
sort \
1607 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkincludes.pl
1610 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1611 -name
'*.[hcS]' -type f
-print |
sort \
1612 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkversion.pl
1615 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/$@
1618 $(PERL
) $(srctree
)/scripts
/namespace.pl
1621 $(PERL
) $(srctree
)/scripts
/export_report.pl
1623 PHONY
+= checkstack kernelrelease kernelversion image_name
1625 # UML needs a little special treatment here. It wants to use the host
1626 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1627 # else wants $(ARCH), including people doing cross-builds, which means
1628 # that $(SUBARCH) doesn't work here.
1630 CHECKSTACK_ARCH
:= $(SUBARCH
)
1632 CHECKSTACK_ARCH
:= $(ARCH
)
1635 $(OBJDUMP
) -d vmlinux
$$(find .
-name
'*.ko') | \
1636 $(PERL
) $(src
)/scripts
/checkstack.pl
$(CHECKSTACK_ARCH
)
1639 @echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1642 @echo
$(KERNELVERSION
)
1645 @echo
$(KBUILD_IMAGE
)
1647 # Clear a bunch of variables before executing the submake
1649 $(Q
)mkdir
-p
$(objtree
)/tools
1650 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(src
)/tools
/
1653 $(Q
)mkdir
-p
$(objtree
)/tools
1654 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(src
)/tools
/ $*
1657 # ---------------------------------------------------------------------------
1658 # Single targets are compatible with:
1659 # - build with mixed source and output
1660 # - build with separate output dir 'make O=...'
1661 # - external modules
1663 # target-dir => where to store outputfile
1664 # build-dir => directory in kernel source tree to use
1666 ifeq ($(KBUILD_EXTMOD
),)
1667 build-dir
= $(patsubst %/,%,$(dir $@
))
1668 target-dir
= $(dir $@
)
1670 zap-slash
=$(filter-out .
,$(patsubst %/,%,$(dir $@
)))
1671 build-dir
= $(KBUILD_EXTMOD
)$(if
$(zap-slash
),/$(zap-slash
))
1672 target-dir
= $(if
$(KBUILD_EXTMOD
),$(dir $<),$(dir $@
))
1675 %.s
: %.c prepare scripts FORCE
1676 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1677 %.i
: %.c prepare scripts FORCE
1678 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1679 %.o
: %.c prepare scripts FORCE
1680 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1681 %.lst
: %.c prepare scripts FORCE
1682 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1683 %.s
: %.S prepare scripts FORCE
1684 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1685 %.o
: %.S prepare scripts FORCE
1686 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1687 %.symtypes
: %.c prepare scripts FORCE
1688 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1689 %.ll
: %.c prepare scripts FORCE
1690 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1693 /: prepare scripts FORCE
1695 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1696 $(build
)=$(build-dir
)
1697 # Make sure the latest headers are built for Documentation
1698 Documentation
/ samples
/: headers_install
1699 %/: prepare scripts FORCE
1701 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1702 $(build
)=$(build-dir
)
1703 %.ko
: prepare scripts FORCE
1705 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1706 $(build
)=$(build-dir
) $(@
:.ko
=.o
)
1707 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1709 # FIXME Should go into a make.lib or something
1710 # ===========================================================================
1712 quiet_cmd_rmdirs
= $(if
$(wildcard $(rm-dirs
)),CLEAN
$(wildcard $(rm-dirs
)))
1713 cmd_rmdirs
= rm -rf
$(rm-dirs
)
1715 quiet_cmd_rmfiles
= $(if
$(wildcard $(rm-files
)),CLEAN
$(wildcard $(rm-files
)))
1716 cmd_rmfiles
= rm -f
$(rm-files
)
1718 # Run depmod only if we have System.map and depmod is executable
1719 quiet_cmd_depmod
= DEPMOD
$(KERNELRELEASE
)
1720 cmd_depmod
= $(CONFIG_SHELL
) $(srctree
)/scripts
/depmod.sh
$(DEPMOD
) \
1723 # Create temporary dir for module support files
1724 # clean it up only when building all modules
1725 cmd_crmodverdir
= $(Q
)mkdir
-p
$(MODVERDIR
) \
1726 $(if
$(KBUILD_MODULES
),; rm -f
$(MODVERDIR
)/*)
1728 # read all saved command lines
1729 cmd_files
:= $(wildcard .
*.cmd
)
1731 ifneq ($(cmd_files
),)
1732 $(cmd_files
): ; # Do not try to update included dependency files
1733 include $(cmd_files
)
1736 endif # ifeq ($(config-targets),1)
1737 endif # ifeq ($(mixed-targets),1)
1738 endif # skip-makefile
1743 # Declare the contents of the PHONY variable as phony. We keep that
1744 # information in a variable so we can use it in if_changed and friends.