8 # To see a list of typical targets execute "make help"
9 # More info can be located in ./README
10 # Comments in this file are targeted only to the developer, do not
11 # expect to learn how to build the kernel reading this file.
13 # o Do not use make's built-in rules and variables
14 # (this increases performance and avoids hard-to-debug behaviour);
15 # o Look for make include files relative to root of kernel src
16 MAKEFLAGS
+= -rR
--include-dir
=$(CURDIR
)
18 # Avoid funny character set dependencies
22 export LC_COLLATE LC_NUMERIC
24 # Avoid interference with shell env settings
27 # We are using a recursive build, so we need to do a little thinking
28 # to get the ordering right.
30 # Most importantly: sub-Makefiles should only ever modify files in
31 # their own directory. If in some directory we have a dependency on
32 # a file in another dir (which doesn't happen often, but it's often
33 # unavoidable when linking the built-in.o targets which finally
34 # turn into vmlinux), we will call a sub make in that other dir, and
35 # after that we are sure that everything which is in that other dir
38 # The only cases where we need to modify files which have global
39 # effects are thus separated out and done before the recursive
40 # descending is started. They are now explicitly listed as the
44 # ---------------------------------------------------------------------------
46 # Normally, we echo the whole command before executing it. By making
47 # that echo $($(quiet)$(cmd)), we now have the possibility to set
48 # $(quiet) to choose other forms of output instead, e.g.
50 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
51 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
53 # If $(quiet) is empty, the whole command will be printed.
54 # If it is set to "quiet_", only the short version will be printed.
55 # If it is set to "silent_", nothing will be printed at all, since
56 # the variable $(silent_cmd_cc_o_c) doesn't exist.
58 # A simple variant is to prefix commands with $(Q) - that's useful
59 # for commands that shall be hidden in non-verbose mode.
63 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
64 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
66 # To put more focus on warnings, be less verbose as default
67 # Use 'make V=1' to see the full commands
69 ifeq ("$(origin V)", "command line")
76 ifeq ($(KBUILD_VERBOSE
),1)
84 # If the user is running make -s (silent mode), suppress echoing of
87 ifneq ($(filter 4.
%,$(MAKE_VERSION
)),) # make-4
88 ifneq ($(filter %s
,$(firstword x
$(MAKEFLAGS
))),)
93 ifneq ($(filter s
% -s
%,$(MAKEFLAGS
)),)
99 export quiet Q KBUILD_VERBOSE
101 # kbuild supports saving output files in a separate directory.
102 # To locate output files in a separate directory two syntaxes are supported.
103 # In both cases the working directory must be the root of the kernel src.
105 # Use "make O=dir/to/store/output/files/"
107 # 2) Set KBUILD_OUTPUT
108 # Set the environment variable KBUILD_OUTPUT to point to the directory
109 # where the output files shall be placed.
110 # export KBUILD_OUTPUT=dir/to/store/output/files/
113 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
116 # KBUILD_SRC is set on invocation of make in OBJ directory
117 # KBUILD_SRC is not intended to be used by the regular user (for now)
118 ifeq ($(KBUILD_SRC
),)
120 # OK, Make called in directory where kernel src resides
121 # Do we want to locate output files in a separate directory?
122 ifeq ("$(origin O)", "command line")
123 KBUILD_OUTPUT
:= $(O
)
126 # That's our default target when none is given on the command line
130 # Cancel implicit rules on top Makefile
131 $(CURDIR
)/Makefile Makefile
: ;
133 ifneq ($(words $(subst :, ,$(CURDIR
))), 1)
134 $(error main directory cannot contain spaces nor colons
)
137 ifneq ($(KBUILD_OUTPUT
),)
138 # Invoke a second make in the output directory, passing relevant variables
139 # check that the output directory actually exists
140 saved-output
:= $(KBUILD_OUTPUT
)
141 KBUILD_OUTPUT
:= $(shell mkdir
-p
$(KBUILD_OUTPUT
) && cd
$(KBUILD_OUTPUT
) \
143 $(if
$(KBUILD_OUTPUT
),, \
144 $(error failed to create output directory
"$(saved-output)"))
146 PHONY
+= $(MAKECMDGOALS
) sub-make
148 $(filter-out _all sub-make
$(CURDIR
)/Makefile
, $(MAKECMDGOALS
)) _all
: sub-make
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 ($(skip-makefile
),)
163 # Do not print "Entering directory ...",
164 # but we want to display it when entering to the output directory
165 # so that IDEs/editors are able to understand relative filenames.
166 MAKEFLAGS
+= --no-print-directory
168 # Call a source code checker (by default, "sparse") as part of the
171 # Use 'make C=1' to enable checking of only re-compiled files.
172 # Use 'make C=2' to enable checking of *all* source files, regardless
173 # of whether they are re-compiled or not.
175 # See the file "Documentation/sparse.txt" for more details, including
176 # where to get the "sparse" utility.
178 ifeq ("$(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
:= $(M
)
196 # If building an external module we do not care about the all: rule
197 # but instead _all depend on modules
199 ifeq ($(KBUILD_EXTMOD
),)
205 ifeq ($(KBUILD_SRC
),)
206 # building in the source tree
209 ifeq ($(KBUILD_SRC
)/,$(dir $(CURDIR
)))
210 # building in a subdirectory of the source tree
213 srctree
:= $(KBUILD_SRC
)
220 VPATH
:= $(srctree
)$(if
$(KBUILD_EXTMOD
),:$(KBUILD_EXTMOD
))
222 export srctree objtree VPATH
224 # SUBARCH tells the usermode build what the underlying arch is. That is set
225 # first, and if a usermode build is happening, the "ARCH=um" on the command
226 # line overrides the setting of ARCH below. If a native build is happening,
227 # then ARCH is assigned, getting whatever value it gets normally, and
228 # SUBARCH is subsequently ignored.
230 SUBARCH
:= $(shell uname
-m | sed
-e s
/i
.86/x86
/ -e s
/x86_64
/x86
/ \
231 -e s
/sun4u
/sparc64
/ \
232 -e s
/arm.
*/arm
/ -e s
/sa110
/arm
/ \
233 -e s
/s390x
/s390
/ -e s
/parisc64
/parisc
/ \
234 -e s
/ppc.
*/powerpc
/ -e s
/mips.
*/mips
/ \
235 -e s
/sh
[234].
*/sh
/ -e s
/aarch64.
*/arm64
/ )
237 # Cross compiling and selecting different set of gcc/bin-utils
238 # ---------------------------------------------------------------------------
240 # When performing cross compilation for other architectures ARCH shall be set
241 # to the target architecture. (See arch/* for the possibilities).
242 # ARCH can be set during invocation of make:
244 # Another way is to have ARCH set in the environment.
245 # The default ARCH is the host where make is executed.
247 # CROSS_COMPILE specify the prefix used for all executables used
248 # during compilation. Only gcc and related bin-utils executables
249 # are prefixed with $(CROSS_COMPILE).
250 # CROSS_COMPILE can be set on the command line
251 # make CROSS_COMPILE=ia64-linux-
252 # Alternatively CROSS_COMPILE can be set in the environment.
253 # A third alternative is to store a setting in .config so that plain
254 # "make" in the configured kernel build directory always uses that.
255 # Default value for CROSS_COMPILE is not to prefix executables
256 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
258 CROSS_COMPILE ?
= $(CONFIG_CROSS_COMPILE
:"%"=%)
260 # Architecture as present in compile.h
261 UTS_MACHINE
:= $(ARCH
)
264 # Additional ARCH settings for x86
268 ifeq ($(ARCH
),x86_64
)
272 # Additional ARCH settings for sparc
273 ifeq ($(ARCH
),sparc32
)
276 ifeq ($(ARCH
),sparc64
)
280 # Additional ARCH settings for sh
285 # Additional ARCH settings for tile
286 ifeq ($(ARCH
),tilepro
)
289 ifeq ($(ARCH
),tilegx
)
293 # Where to locate arch specific headers
294 hdr-arch
:= $(SRCARCH
)
296 KCONFIG_CONFIG ?
= .config
297 export KCONFIG_CONFIG
299 # SHELL used by kbuild
300 CONFIG_SHELL
:= $(shell if
[ -x
"$$BASH" ]; then echo
$$BASH; \
301 else if
[ -x
/bin
/bash
]; then echo
/bin
/bash
; \
302 else echo sh
; fi
; fi
)
306 HOSTCFLAGS
= -Wall
-Wmissing-prototypes
-Wstrict-prototypes
-O2
-fomit-frame-pointer
-std
=gnu89
309 ifeq ($(shell $(HOSTCC
) -v
2>&1 | grep
-c
"clang version"), 1)
310 HOSTCFLAGS
+= -Wno-unused-value
-Wno-unused-parameter \
311 -Wno-missing-field-initializers
-fno-delete-null-pointer-checks
314 # Decide whether to build built-in, modular, or both.
315 # Normally, just do built-in.
320 # If we have only "make modules", don't compile built-in objects.
321 # When we're building modules with modversions, we need to consider
322 # the built-in objects during the descend as well, in order to
323 # make sure the checksums are up to date before we record them.
325 ifeq ($(MAKECMDGOALS
),modules
)
326 KBUILD_BUILTIN
:= $(if
$(CONFIG_MODVERSIONS
),1)
329 # If we have "make <whatever> modules", compile modules
330 # in addition to whatever we do anyway.
331 # Just "make" or "make all" shall build modules as well
333 ifneq ($(filter all _all modules
,$(MAKECMDGOALS
)),)
337 ifeq ($(MAKECMDGOALS
),)
341 export KBUILD_MODULES KBUILD_BUILTIN
342 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
344 # We need some generic definitions (do not try to remake the file).
345 scripts
/Kbuild.
include: ;
346 include scripts
/Kbuild.
include
348 # Make variables (CC, etc...)
349 AS
= $(CROSS_COMPILE
)as
350 LD
= $(CROSS_COMPILE
)ld
351 CC
= $(CROSS_COMPILE
)gcc
353 AR
= $(CROSS_COMPILE
)ar
354 NM
= $(CROSS_COMPILE
)nm
355 STRIP
= $(CROSS_COMPILE
)strip
356 OBJCOPY
= $(CROSS_COMPILE
)objcopy
357 OBJDUMP
= $(CROSS_COMPILE
)objdump
359 GENKSYMS
= scripts
/genksyms
/genksyms
360 INSTALLKERNEL
:= installkernel
361 DEPMOD
= /sbin
/depmod
366 CHECKFLAGS
:= -D__linux__
-Dlinux
-D__STDC__
-Dunix
-D__unix__ \
367 -Wbitwise
-Wno-return-void
$(CF
)
375 CFLAGS_GCOV
= -fprofile-arcs
-ftest-coverage
-fno-tree-loop-im
-Wno-maybe-uninitialized
376 CFLAGS_KCOV
:= $(call cc-option
,-fsanitize-coverage
=trace-pc
,)
379 # Use USERINCLUDE when you must reference the UAPI directories only.
381 -I
$(srctree
)/arch
/$(hdr-arch
)/include/uapi \
382 -I
$(objtree
)/arch
/$(hdr-arch
)/include/generated
/uapi \
383 -I
$(srctree
)/include/uapi \
384 -I
$(objtree
)/include/generated
/uapi \
385 -include $(srctree
)/include/linux
/kconfig.h
387 # Use LINUXINCLUDE when you must reference the include/ directory.
388 # Needed to be compatible with the O= option
390 -I
$(srctree
)/arch
/$(hdr-arch
)/include \
391 -I
$(objtree
)/arch
/$(hdr-arch
)/include/generated
/uapi \
392 -I
$(objtree
)/arch
/$(hdr-arch
)/include/generated \
393 $(if
$(KBUILD_SRC
), -I
$(srctree
)/include) \
396 LINUXINCLUDE
+= $(filter-out $(LINUXINCLUDE
),$(USERINCLUDE
))
398 KBUILD_CPPFLAGS
:= -D__KERNEL__
400 KBUILD_CFLAGS
:= -Wall
-Wundef
-Wstrict-prototypes
-Wno-trigraphs \
401 -fno-strict-aliasing
-fno-common \
402 -Werror-implicit-function-declaration \
403 -Wno-format-security \
404 -std
=gnu89
$(call cc-option
,-fno-PIE
)
407 KBUILD_AFLAGS_KERNEL
:=
408 KBUILD_CFLAGS_KERNEL
:=
409 KBUILD_AFLAGS
:= -D__ASSEMBLY__
$(call cc-option
,-fno-PIE
)
410 KBUILD_AFLAGS_MODULE
:= -DMODULE
411 KBUILD_CFLAGS_MODULE
:= -DMODULE
412 KBUILD_LDFLAGS_MODULE
:= -T
$(srctree
)/scripts
/module-common.lds
414 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
415 KERNELRELEASE
= $(shell cat
include/config
/kernel.release
2> /dev
/null
)
416 KERNELVERSION
= $(VERSION
)$(if
$(PATCHLEVEL
),.
$(PATCHLEVEL
)$(if
$(SUBLEVEL
),.
$(SUBLEVEL
)))$(EXTRAVERSION
)
418 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
419 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
420 export CPP AR NM STRIP OBJCOPY OBJDUMP
421 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
422 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
424 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
425 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
426 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
427 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
428 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
429 export KBUILD_ARFLAGS
431 # When compiling out-of-tree modules, put MODVERDIR in the module
432 # tree rather than in the kernel tree. The kernel tree might
434 export MODVERDIR
:= $(if
$(KBUILD_EXTMOD
),$(firstword $(KBUILD_EXTMOD
))/).tmp_versions
436 # Files to ignore in find ... statements
438 export RCS_FIND_IGNORE
:= \
( -name SCCS
-o
-name BitKeeper
-o
-name .svn
-o \
439 -name CVS
-o
-name .
pc -o
-name .hg
-o
-name .git \
) \
441 export RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn \
442 --exclude CVS
--exclude .
pc --exclude .hg
--exclude .git
444 # ===========================================================================
445 # Rules shared between *config targets and build targets
447 # Basic helpers built in scripts/
448 PHONY
+= scripts_basic
450 $(Q
)$(MAKE
) $(build
)=scripts
/basic
451 $(Q
)rm -f .tmp_quiet_recordmcount
453 # To avoid any implicit rule to kick in, define an empty command.
454 scripts
/basic
/%: scripts_basic
;
456 PHONY
+= outputmakefile
457 # outputmakefile generates a Makefile in the output directory, if using a
458 # separate output directory. This allows convenient use of make in the
461 ifneq ($(KBUILD_SRC
),)
462 $(Q
)ln
-fsn
$(srctree
) source
463 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/mkmakefile \
464 $(srctree
) $(objtree
) $(VERSION
) $(PATCHLEVEL
)
467 # Support for using generic headers in asm-generic
470 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.asm-generic \
471 src
=asm obj
=arch
/$(SRCARCH
)/include/generated
/asm
472 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.asm-generic \
473 src
=uapi
/asm obj
=arch
/$(SRCARCH
)/include/generated
/uapi
/asm
475 # To make sure we do not include .config for any of the *config targets
476 # catch them early, and hand them over to scripts/kconfig/Makefile
477 # It is allowed to specify more targets when calling make, including
478 # mixing *config targets and build targets.
479 # For example 'make oldconfig all'.
480 # Detect when mixed targets is specified, and make a second invocation
481 # of make so .config is not included in this case either (for *config).
483 version_h
:= include/generated
/uapi
/linux
/version.h
484 old_version_h
:= include/linux
/version.h
486 no-dot-config-targets
:= clean mrproper
distclean \
487 cscope gtags TAGS
tags help
% %docs
check% coccicheck \
488 $(version_h
) headers_
% archheaders archscripts \
489 kernelversion
%src-pkg
495 ifneq ($(filter $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
496 ifeq ($(filter-out $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
501 ifeq ($(KBUILD_EXTMOD
),)
502 ifneq ($(filter config
%config
,$(MAKECMDGOALS
)),)
504 ifneq ($(words $(MAKECMDGOALS
)),1)
509 # install and module_install need also be processed one by one
510 ifneq ($(filter install,$(MAKECMDGOALS
)),)
511 ifneq ($(filter modules_install
,$(MAKECMDGOALS
)),)
516 ifeq ($(mixed-targets
),1)
517 # ===========================================================================
518 # We're called with mixed targets (*config and build targets).
519 # Handle them one by one.
521 PHONY
+= $(MAKECMDGOALS
) __build_one_by_one
523 $(filter-out __build_one_by_one
, $(MAKECMDGOALS
)): __build_one_by_one
528 for i in
$(MAKECMDGOALS
); do \
529 $(MAKE
) -f
$(srctree
)/Makefile
$$i; \
533 ifeq ($(config-targets
),1)
534 # ===========================================================================
535 # *config targets only - make sure prerequisites are updated, and descend
536 # in scripts/kconfig to make the *config target
538 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
539 # KBUILD_DEFCONFIG may point out an alternative default configuration
540 # used for 'make defconfig'
541 include arch
/$(SRCARCH
)/Makefile
542 export KBUILD_DEFCONFIG KBUILD_KCONFIG
544 config
: scripts_basic outputmakefile FORCE
545 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
547 %config
: scripts_basic outputmakefile FORCE
548 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
551 # ===========================================================================
552 # Build targets only - this includes vmlinux, arch specific targets, clean
553 # targets and others. In general all targets except *config targets.
555 ifeq ($(KBUILD_EXTMOD
),)
556 # Additional helpers built in scripts/
557 # Carefully list dependencies so we do not try to build scripts twice
560 scripts
: scripts_basic
include/config
/auto.conf
include/config
/tristate.conf \
561 asm-generic gcc-plugins
562 $(Q
)$(MAKE
) $(build
)=$(@
)
564 # Objects we will link into vmlinux / subdirs we need to visit
566 drivers-y
:= drivers
/ sound
/ firmware
/
571 endif # KBUILD_EXTMOD
573 ifeq ($(dot-config
),1)
575 -include include/config
/auto.conf
577 ifeq ($(KBUILD_EXTMOD
),)
578 # Read in dependencies to all Kconfig* files, make sure to run
579 # oldconfig if changes are detected.
580 -include include/config
/auto.conf.cmd
582 # To avoid any implicit rule to kick in, define an empty command
583 $(KCONFIG_CONFIG
) include/config
/auto.conf.cmd
: ;
585 # If .config is newer than include/config/auto.conf, someone tinkered
586 # with it and forgot to run make oldconfig.
587 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
588 # we execute the config step to be sure to catch updated Kconfig files
589 include/config
/%.conf
: $(KCONFIG_CONFIG
) include/config
/auto.conf.cmd
590 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile silentoldconfig
592 # external modules needs include/generated/autoconf.h and include/config/auto.conf
593 # but do not care if they are up-to-date. Use auto.conf to trigger the test
594 PHONY
+= include/config
/auto.conf
596 include/config
/auto.conf
:
597 $(Q
)test -e
include/generated
/autoconf.h
-a
-e
$@ ||
( \
599 echo
>&2 " ERROR: Kernel configuration is invalid."; \
600 echo
>&2 " include/generated/autoconf.h or $@ are missing.";\
601 echo
>&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
605 endif # KBUILD_EXTMOD
608 # Dummy target needed, because used as prerequisite
609 include/config
/auto.conf
: ;
610 endif # $(dot-config)
612 # For the kernel to actually contain only the needed exported symbols,
613 # we have to build modules as well to determine what those symbols are.
614 # (this can be evaluated only once include/config/auto.conf has been included)
615 ifdef CONFIG_TRIM_UNUSED_KSYMS
619 # The all: target is the default when no target is given on the
621 # This allow a user to issue only 'make' to build a kernel including modules
622 # Defaults to vmlinux, but the arch makefile usually adds further targets
625 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
626 # values of the respective KBUILD_* variables
630 include arch
/$(SRCARCH
)/Makefile
632 KBUILD_CFLAGS
+= $(call cc-option
,-fno-delete-null-pointer-checks
,)
633 KBUILD_CFLAGS
+= $(call cc-disable-warning
,frame-address
,)
635 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
636 KBUILD_CFLAGS
+= $(call cc-option
,-Oz
,-Os
)
637 KBUILD_CFLAGS
+= $(call cc-disable-warning
,maybe-uninitialized
,)
639 ifdef CONFIG_PROFILE_ALL_BRANCHES
640 KBUILD_CFLAGS
+= -O2
$(call cc-disable-warning
,maybe-uninitialized
,)
646 KBUILD_CFLAGS
+= $(call cc-ifversion
, -lt
, 0409, \
647 $(call cc-disable-warning
,maybe-uninitialized
,))
649 # Tell gcc to never replace conditional load with a non-conditional one
650 KBUILD_CFLAGS
+= $(call cc-option
,--param
=allow-store-data-races
=0)
652 include scripts
/Makefile.gcc-plugins
654 ifdef CONFIG_READABLE_ASM
655 # Disable optimizations that make assembler listings hard to read.
656 # reorder blocks reorders the control in the function
657 # ipa clone creates specialized cloned functions
658 # partial inlining inlines only parts of functions
659 KBUILD_CFLAGS
+= $(call cc-option
,-fno-reorder-blocks
,) \
660 $(call cc-option
,-fno-ipa-cp-clone
,) \
661 $(call cc-option
,-fno-partial-inlining
)
664 ifneq ($(CONFIG_FRAME_WARN
),0)
665 KBUILD_CFLAGS
+= $(call cc-option
,-Wframe-larger-than
=${CONFIG_FRAME_WARN})
668 # This selects the stack protector compiler flag. Testing it is delayed
669 # until after .config has been reprocessed, in the prepare-compiler-check
671 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
672 stackp-flag
:= -fstack-protector
673 stackp-name
:= REGULAR
675 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
676 stackp-flag
:= -fstack-protector-strong
677 stackp-name
:= STRONG
679 # Force off for distro compilers that enable stack protector by default.
680 stackp-flag
:= $(call cc-option
, -fno-stack-protector
)
683 # Find arch-specific stack protector compiler sanity-checking script.
684 ifdef CONFIG_CC_STACKPROTECTOR
685 stackp-path
:= $(srctree
)/scripts
/gcc-
$(SRCARCH
)_
$(BITS
)-has-stack-protector.sh
686 stackp-check
:= $(wildcard $(stackp-path
))
688 KBUILD_CFLAGS
+= $(stackp-flag
)
690 ifeq ($(cc-name
),clang
)
691 ifneq ($(CROSS_COMPILE
),)
692 CLANG_TARGET
:= -target
$(notdir $(CROSS_COMPILE
:%-=%))
693 GCC_TOOLCHAIN
:= $(realpath
$(dir $(shell which
$(LD
)))/..
)
695 ifneq ($(GCC_TOOLCHAIN
),)
696 CLANG_GCC_TC
:= -gcc-toolchain
$(GCC_TOOLCHAIN
)
698 KBUILD_CFLAGS
+= $(CLANG_TARGET
) $(CLANG_GCC_TC
)
699 KBUILD_AFLAGS
+= $(CLANG_TARGET
) $(CLANG_GCC_TC
)
700 KBUILD_CPPFLAGS
+= $(call cc-option
,-Qunused-arguments
,)
701 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-variable
)
702 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-invalid-specifier
)
703 KBUILD_CFLAGS
+= $(call cc-disable-warning
, gnu
)
704 # Quiet clang warning: comparison of unsigned expression < 0 is always false
705 KBUILD_CFLAGS
+= $(call cc-disable-warning
, tautological-compare
)
706 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
707 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
708 # See modpost pattern 2
709 KBUILD_CFLAGS
+= $(call cc-option
, -mno-global-merge
,)
710 KBUILD_CFLAGS
+= $(call cc-option
, -fcatch-undefined-behavior
)
713 # These warnings generated too much noise in a regular build.
714 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
715 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-but-set-variable
)
716 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-const-variable
)
719 ifdef CONFIG_FRAME_POINTER
720 KBUILD_CFLAGS
+= -fno-omit-frame-pointer
-fno-optimize-sibling-calls
722 # Some targets (ARM with Thumb2, for example), can't be built with frame
723 # pointers. For those, we don't have FUNCTION_TRACER automatically
724 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
725 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
726 # -fomit-frame-pointer with FUNCTION_TRACER.
727 ifndef CONFIG_FUNCTION_TRACER
728 KBUILD_CFLAGS
+= -fomit-frame-pointer
732 KBUILD_CFLAGS
+= $(call cc-option
, -fno-var-tracking-assignments
)
734 ifdef CONFIG_DEBUG_INFO
735 ifdef CONFIG_DEBUG_INFO_SPLIT
736 KBUILD_CFLAGS
+= $(call cc-option
, -gsplit-dwarf
, -g
)
740 KBUILD_AFLAGS
+= -Wa
,-gdwarf-2
742 ifdef CONFIG_DEBUG_INFO_DWARF4
743 KBUILD_CFLAGS
+= $(call cc-option
, -gdwarf-4
,)
746 ifdef CONFIG_DEBUG_INFO_REDUCED
747 KBUILD_CFLAGS
+= $(call cc-option
, -femit-struct-debug-baseonly
) \
748 $(call cc-option
,-fno-var-tracking
)
751 ifdef CONFIG_FUNCTION_TRACER
752 ifndef CC_FLAGS_FTRACE
753 CC_FLAGS_FTRACE
:= -pg
755 export CC_FLAGS_FTRACE
756 ifdef CONFIG_HAVE_FENTRY
757 CC_USING_FENTRY
:= $(call cc-option
, -mfentry
-DCC_USING_FENTRY
)
759 KBUILD_CFLAGS
+= $(CC_FLAGS_FTRACE
) $(CC_USING_FENTRY
)
760 KBUILD_AFLAGS
+= $(CC_USING_FENTRY
)
761 ifdef CONFIG_DYNAMIC_FTRACE
762 ifdef CONFIG_HAVE_C_RECORDMCOUNT
763 BUILD_C_RECORDMCOUNT
:= y
764 export BUILD_C_RECORDMCOUNT
769 # We trigger additional mismatches with less inlining
770 ifdef CONFIG_DEBUG_SECTION_MISMATCH
771 KBUILD_CFLAGS
+= $(call cc-option
, -fno-inline-functions-called-once
)
774 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
775 KBUILD_CFLAGS
+= $(call cc-option
,-ffunction-sections
,)
776 KBUILD_CFLAGS
+= $(call cc-option
,-fdata-sections
,)
779 # arch Makefile may override CC so keep this after arch Makefile is included
780 NOSTDINC_FLAGS
+= -nostdinc
-isystem
$(shell $(CC
) -print-file-name
=include)
781 CHECKFLAGS
+= $(NOSTDINC_FLAGS
)
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 # conserve stack if available
793 KBUILD_CFLAGS
+= $(call cc-option
,-fconserve-stack
)
795 # disallow errors like 'EXPORT_GPL(foo);' with missing header
796 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=implicit-int
)
798 # require functions to have arguments in prototypes, not empty 'int foo()'
799 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=strict-prototypes
)
801 # Prohibit date/time macros, which would make the build non-deterministic
802 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=date-time
)
804 # enforce correct pointer usage
805 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=incompatible-pointer-types
)
807 # Require designated initializers for all marked structures
808 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=designated-init
)
810 # use the deterministic mode of AR if available
811 KBUILD_ARFLAGS
:= $(call ar-option
,D
)
813 # check for 'asm goto'
814 ifeq ($(shell $(CONFIG_SHELL
) $(srctree
)/scripts
/gcc-goto.sh
$(CC
) $(KBUILD_CFLAGS
)), y
)
815 KBUILD_CFLAGS
+= -DCC_HAVE_ASM_GOTO
816 KBUILD_AFLAGS
+= -DCC_HAVE_ASM_GOTO
819 include scripts
/Makefile.kasan
820 include scripts
/Makefile.extrawarn
821 include scripts
/Makefile.ubsan
823 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
825 KBUILD_CPPFLAGS
+= $(ARCH_CPPFLAGS
) $(KCPPFLAGS
)
826 KBUILD_AFLAGS
+= $(ARCH_AFLAGS
) $(KAFLAGS
)
827 KBUILD_CFLAGS
+= $(ARCH_CFLAGS
) $(KCFLAGS
)
829 # Use --build-id when available.
830 LDFLAGS_BUILD_ID
= $(patsubst -Wl
$(comma
)%,%,\
831 $(call cc-ldoption
, -Wl
$(comma
)--build-id
,))
832 KBUILD_LDFLAGS_MODULE
+= $(LDFLAGS_BUILD_ID
)
833 LDFLAGS_vmlinux
+= $(LDFLAGS_BUILD_ID
)
835 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
836 LDFLAGS_vmlinux
+= $(call ld-option
, --gc-sections
,)
839 ifeq ($(CONFIG_STRIP_ASM_SYMS
),y
)
840 LDFLAGS_vmlinux
+= $(call ld-option
, -X
,)
843 # Default kernel image to build when no specific target is given.
844 # KBUILD_IMAGE may be overruled on the command line or
845 # set in the environment
846 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
848 export KBUILD_IMAGE ?
= vmlinux
851 # INSTALL_PATH specifies where to place the updated kernel and system map
852 # images. Default is /boot, but you can set it to other values
853 export INSTALL_PATH ?
= /boot
856 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
857 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
858 # an argument if needed. Otherwise it defaults to the kernel install path
860 export INSTALL_DTBS_PATH ?
= $(INSTALL_PATH
)/dtbs
/$(KERNELRELEASE
)
863 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
864 # relocations required by build roots. This is not defined in the
865 # makefile but the argument can be passed to make if needed.
868 MODLIB
= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
872 # INSTALL_MOD_STRIP, if defined, will cause modules to be
873 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
874 # the default option --strip-debug will be used. Otherwise,
875 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
877 ifdef INSTALL_MOD_STRIP
878 ifeq ($(INSTALL_MOD_STRIP
),1)
879 mod_strip_cmd
= $(STRIP
) --strip-debug
881 mod_strip_cmd
= $(STRIP
) $(INSTALL_MOD_STRIP
)
882 endif # INSTALL_MOD_STRIP=1
885 endif # INSTALL_MOD_STRIP
888 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
889 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
890 # or CONFIG_MODULE_COMPRESS_XZ.
892 mod_compress_cmd
= true
893 ifdef CONFIG_MODULE_COMPRESS
894 ifdef CONFIG_MODULE_COMPRESS_GZIP
895 mod_compress_cmd
= gzip
-n
-f
896 endif # CONFIG_MODULE_COMPRESS_GZIP
897 ifdef CONFIG_MODULE_COMPRESS_XZ
898 mod_compress_cmd
= xz
-f
899 endif # CONFIG_MODULE_COMPRESS_XZ
900 endif # CONFIG_MODULE_COMPRESS
901 export mod_compress_cmd
903 # Select initial ramdisk compression format, default is gzip(1).
904 # This shall be used by the dracut(8) tool while creating an initramfs image.
906 INITRD_COMPRESS-y
:= gzip
907 INITRD_COMPRESS-
$(CONFIG_RD_BZIP2
) := bzip2
908 INITRD_COMPRESS-
$(CONFIG_RD_LZMA
) := lzma
909 INITRD_COMPRESS-
$(CONFIG_RD_XZ
) := xz
910 INITRD_COMPRESS-
$(CONFIG_RD_LZO
) := lzo
911 INITRD_COMPRESS-
$(CONFIG_RD_LZ4
) := lz4
912 # do not export INITRD_COMPRESS, since we didn't actually
913 # choose a sane default compression above.
914 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
916 ifdef CONFIG_MODULE_SIG_ALL
917 $(eval
$(call config_filename
,MODULE_SIG_KEY
))
919 mod_sign_cmd
= scripts
/sign-file
$(CONFIG_MODULE_SIG_HASH
) $(MODULE_SIG_KEY_SRCPREFIX
)$(CONFIG_MODULE_SIG_KEY
) certs
/signing_key.x509
925 ifdef CONFIG_STACK_VALIDATION
926 has_libelf
:= $(call try-run
,\
927 echo
"int main() {}" |
$(HOSTCC
) -xc
-o
/dev
/null
-lelf
-,1,0)
928 ifeq ($(has_libelf
),1)
929 objtool_target
:= tools
/objtool FORCE
931 $(warning
"Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
932 SKIP_STACK_VALIDATION
:= 1
933 export SKIP_STACK_VALIDATION
938 ifeq ($(KBUILD_EXTMOD
),)
939 core-y
+= kernel
/ certs
/ mm
/ fs
/ ipc
/ security
/ crypto
/ block
/
941 vmlinux-dirs
:= $(patsubst %/,%,$(filter %/, $(init-y
) $(init-m
) \
942 $(core-y
) $(core-m
) $(drivers-y
) $(drivers-m
) \
943 $(net-y
) $(net-m
) $(libs-y
) $(libs-m
) $(virt-y
)))
945 vmlinux-alldirs
:= $(sort $(vmlinux-dirs
) $(patsubst %/,%,$(filter %/, \
946 $(init-
) $(core-
) $(drivers-
) $(net-
) $(libs-
) $(virt-
))))
948 init-y
:= $(patsubst %/, %/built-in.o
, $(init-y
))
949 core-y
:= $(patsubst %/, %/built-in.o
, $(core-y
))
950 drivers-y
:= $(patsubst %/, %/built-in.o
, $(drivers-y
))
951 net-y
:= $(patsubst %/, %/built-in.o
, $(net-y
))
952 libs-y1
:= $(patsubst %/, %/lib.a
, $(libs-y
))
953 libs-y2
:= $(patsubst %/, %/built-in.o
, $(libs-y
))
954 libs-y
:= $(libs-y1
) $(libs-y2
)
955 virt-y
:= $(patsubst %/, %/built-in.o
, $(virt-y
))
957 # Externally visible symbols (used by link-vmlinux.sh)
958 export KBUILD_VMLINUX_INIT
:= $(head-y
) $(init-y
)
959 export KBUILD_VMLINUX_MAIN
:= $(core-y
) $(libs-y
) $(drivers-y
) $(net-y
) $(virt-y
)
960 export KBUILD_LDS
:= arch
/$(SRCARCH
)/kernel
/vmlinux.lds
961 export LDFLAGS_vmlinux
962 # used by scripts/pacmage/Makefile
963 export KBUILD_ALLDIRS
:= $(sort $(filter-out arch
/%,$(vmlinux-alldirs
)) arch Documentation
include samples scripts tools
)
965 vmlinux-deps
:= $(KBUILD_LDS
) $(KBUILD_VMLINUX_INIT
) $(KBUILD_VMLINUX_MAIN
)
967 # Include targets which we want to execute sequentially if the rest of the
968 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
969 # evaluated more than once.
970 PHONY
+= vmlinux_prereq
971 vmlinux_prereq
: $(vmlinux-deps
) FORCE
972 ifdef CONFIG_HEADERS_CHECK
973 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile headers_check
975 ifdef CONFIG_GDB_SCRIPTS
976 $(Q
)ln
-fsn
`cd $(srctree) && /bin/pwd`/scripts
/gdb
/vmlinux-gdb.py
978 ifdef CONFIG_TRIM_UNUSED_KSYMS
979 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/adjust_autoksyms.sh \
980 "$(MAKE) -f $(srctree)/Makefile vmlinux"
983 # standalone target for easier testing
984 include/generated
/autoksyms.h
: FORCE
985 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/adjust_autoksyms.sh true
987 ARCH_POSTLINK
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/Makefile.postlink
)
989 # Final link of vmlinux with optional arch pass after final link
991 $(CONFIG_SHELL
) $< $(LD
) $(LDFLAGS
) $(LDFLAGS_vmlinux
) ; \
992 $(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) $@
, true
)
994 vmlinux
: scripts
/link-vmlinux.sh vmlinux_prereq
$(vmlinux-deps
) FORCE
995 +$(call if_changed
,link-vmlinux
)
997 # Build samples along the rest of the kernel
999 vmlinux-dirs
+= samples
1002 # The actual objects are generated when descending,
1003 # make sure no implicit rule kicks in
1004 $(sort $(vmlinux-deps
)): $(vmlinux-dirs
) ;
1006 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1007 # Preset locale variables to speed up the build process. Limit locale
1008 # tweaks to this spot to avoid wrong language settings when running
1009 # make menuconfig etc.
1010 # Error messages still appears in the original language
1012 PHONY
+= $(vmlinux-dirs
)
1013 $(vmlinux-dirs
): prepare scripts
1014 $(Q
)$(MAKE
) $(build
)=$@
1016 define filechk_kernel.release
1017 echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1020 # Store (new) KERNELRELEASE string in include/config/kernel.release
1021 include/config
/kernel.release
: include/config
/auto.conf FORCE
1022 $(call filechk
,kernel.release
)
1025 # Things we need to do before we recursively start building the kernel
1026 # or the modules are listed in "prepare".
1027 # A multi level approach is used. prepareN is processed before prepareN-1.
1028 # archprepare is used in arch Makefiles and when processed asm symlink,
1029 # version.h and scripts_basic is processed / created.
1031 # Listed in dependency order
1032 PHONY
+= prepare archprepare prepare0 prepare1 prepare2 prepare3
1034 # prepare3 is used to check if we are building in a separate output directory,
1036 # 1) Check that make has not been executed in the kernel src $(srctree)
1037 prepare3
: include/config
/kernel.release
1038 ifneq ($(KBUILD_SRC
),)
1039 @
$(kecho
) ' Using $(srctree) as source for kernel'
1040 $(Q
)if
[ -f
$(srctree
)/.config
-o
-d
$(srctree
)/include/config
]; then \
1041 echo
>&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1042 echo
>&2 " in the '$(srctree)' directory.";\
1047 # prepare2 creates a makefile if using a separate output directory.
1048 # From this point forward, .config has been reprocessed, so any rules
1049 # that need to depend on updated CONFIG_* values can be checked here.
1050 prepare2
: prepare3 prepare-compiler-check outputmakefile asm-generic
1052 prepare1
: prepare2
$(version_h
) include/generated
/utsrelease.h \
1053 include/config
/auto.conf
1056 archprepare
: archheaders archscripts prepare1 scripts_basic
1058 prepare0
: archprepare gcc-plugins
1059 $(Q
)$(MAKE
) $(build
)=.
1061 # All the preparing..
1062 prepare
: prepare0 prepare-objtool
1064 PHONY
+= prepare-objtool
1065 prepare-objtool
: $(objtool_target
)
1067 # Check for CONFIG flags that require compiler support. Abort the build
1068 # after .config has been processed, but before the kernel build starts.
1070 # For security-sensitive CONFIG options, we don't want to fallback and/or
1071 # silently change which compiler flags will be used, since that leads to
1072 # producing kernels with different security feature characteristics
1073 # depending on the compiler used. (For example, "But I selected
1074 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1075 PHONY
+= prepare-compiler-check
1076 prepare-compiler-check
: FORCE
1077 # Make sure compiler supports requested stack protector flag.
1079 ifeq ($(call cc-option
, $(stackp-flag
)),)
1080 @echo Cannot use CONFIG_CC_STACKPROTECTOR_
$(stackp-name
): \
1081 $(stackp-flag
) not supported by compiler
>&2 && exit
1
1084 # Make sure compiler does not have buggy stack-protector support.
1086 ifneq ($(shell $(CONFIG_SHELL
) $(stackp-check
) $(CC
) $(KBUILD_CPPFLAGS
) $(biarch
)),y
)
1087 @echo Cannot use CONFIG_CC_STACKPROTECTOR_
$(stackp-name
): \
1088 $(stackp-flag
) available but compiler is broken
>&2 && exit
1
1093 # Generate some files
1094 # ---------------------------------------------------------------------------
1096 # KERNELRELEASE can change from a few different places, meaning version.h
1097 # needs to be updated, so this check is forced on all builds
1100 define filechk_utsrelease.h
1101 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
1102 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1105 (echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1108 define filechk_version.h
1109 (echo \
#define LINUX_VERSION_CODE $(shell \
1110 expr
$(VERSION
) \
* 65536 + 0$(PATCHLEVEL
) \
* 256 + 0$(SUBLEVEL
)); \
1111 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1114 $(version_h
): $(srctree
)/Makefile FORCE
1115 $(call filechk
,version.h
)
1116 $(Q
)rm -f
$(old_version_h
)
1118 include/generated
/utsrelease.h
: include/config
/kernel.release FORCE
1119 $(call filechk
,utsrelease.h
)
1123 $(Q
)find
$(srctree
)/include/ -name
'*.h' | xargs
--max-args
1 \
1124 $(srctree
)/scripts
/headerdep.pl
-I
$(srctree
)/include
1126 # ---------------------------------------------------------------------------
1128 INSTALL_FW_PATH
=$(INSTALL_MOD_PATH
)/lib
/firmware
1129 export INSTALL_FW_PATH
1131 PHONY
+= firmware_install
1133 @mkdir
-p
$(objtree
)/firmware
1134 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.fwinst obj
=firmware __fw_install
1136 # ---------------------------------------------------------------------------
1139 #Default location for installed headers
1140 export INSTALL_HDR_PATH
= $(objtree
)/usr
1142 # If we do an all arch process set dst to asm-$(hdr-arch)
1143 hdr-dst
= $(if
$(KBUILD_HEADERS
), dst
=include/asm-
$(hdr-arch
), dst
=include/asm
)
1145 PHONY
+= archheaders
1148 PHONY
+= archscripts
1152 __headers
: $(version_h
) scripts_basic asm-generic archheaders archscripts
1153 $(Q
)$(MAKE
) $(build
)=scripts build_unifdef
1155 PHONY
+= headers_install_all
1156 headers_install_all
:
1157 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
install
1159 PHONY
+= headers_install
1160 headers_install
: __headers
1161 $(if
$(wildcard $(srctree
)/arch
/$(hdr-arch
)/include/uapi
/asm
/Kbuild
),, \
1162 $(error Headers not exportable for the
$(SRCARCH
) architecture
))
1163 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi
1164 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(hdr-arch
)/include/uapi
/asm
$(hdr-dst
)
1166 PHONY
+= headers_check_all
1167 headers_check_all
: headers_install_all
1168 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
check
1170 PHONY
+= headers_check
1171 headers_check
: headers_install
1172 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi HDRCHECK
=1
1173 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(hdr-arch
)/include/uapi
/asm
$(hdr-dst
) HDRCHECK
=1
1175 # ---------------------------------------------------------------------------
1180 $(Q
)$(MAKE
) -C tools
/testing
/selftests run_tests
1183 $(Q
)$(MAKE
) -C tools
/testing
/selftests
clean
1185 PHONY
+= kselftest-merge
1187 $(if
$(wildcard $(objtree
)/.config
),, $(error No .config exists
, config your kernel first
!))
1188 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/kconfig
/merge_config.sh \
1189 -m
$(objtree
)/.config \
1190 $(srctree
)/tools
/testing
/selftests
/*/config
1191 +$(Q
)$(MAKE
) -f
$(srctree
)/Makefile olddefconfig
1193 # ---------------------------------------------------------------------------
1196 ifdef CONFIG_MODULES
1198 # By default, build modules as well
1204 # A module can be listed more than once in obj-m resulting in
1205 # duplicate lines in modules.order files. Those are removed
1206 # using awk while concatenating to the final file.
1209 modules
: $(vmlinux-dirs
) $(if
$(KBUILD_BUILTIN
),vmlinux
) modules.builtin
1210 $(Q
)$(AWK
) '!x[$$0]++' $(vmlinux-dirs
:%=$(objtree
)/%/modules.order
) > $(objtree
)/modules.order
1211 @
$(kecho
) ' Building modules, stage 2.';
1212 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1213 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.fwinst obj
=firmware __fw_modbuild
1215 modules.builtin
: $(vmlinux-dirs
:%=%/modules.builtin
)
1216 $(Q
)$(AWK
) '!x[$$0]++' $^
> $(objtree
)/modules.builtin
1218 %/modules.builtin
: include/config
/auto.conf
1219 $(Q
)$(MAKE
) $(modbuiltin
)=$*
1222 # Target to prepare building external modules
1223 PHONY
+= modules_prepare
1224 modules_prepare
: prepare scripts
1226 # Target to install modules
1227 PHONY
+= modules_install
1228 modules_install
: _modinst_ _modinst_post
1232 @
rm -rf
$(MODLIB
)/kernel
1233 @
rm -f
$(MODLIB
)/source
1234 @mkdir
-p
$(MODLIB
)/kernel
1235 @ln
-s
`cd $(srctree) && /bin/pwd` $(MODLIB
)/source
1236 @if
[ ! $(objtree
) -ef
$(MODLIB
)/build
]; then \
1237 rm -f
$(MODLIB
)/build
; \
1238 ln
-s
$(CURDIR
) $(MODLIB
)/build
; \
1240 @cp
-f
$(objtree
)/modules.order
$(MODLIB
)/
1241 @cp
-f
$(objtree
)/modules.builtin
$(MODLIB
)/
1242 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1244 # This depmod is only for convenience to give the initial
1245 # boot a modules.dep even before / is mounted read-write. However the
1246 # boot script depmod is the master version.
1247 PHONY
+= _modinst_post
1248 _modinst_post
: _modinst_
1249 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.fwinst obj
=firmware __fw_modinst
1252 ifeq ($(CONFIG_MODULE_SIG
), y
)
1253 PHONY
+= modules_sign
1255 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modsign
1258 else # CONFIG_MODULES
1260 # Modules not configured
1261 # ---------------------------------------------------------------------------
1263 PHONY
+= modules modules_install
1264 modules modules_install
:
1266 @echo
>&2 "The present kernel configuration has modules disabled."
1267 @echo
>&2 "Type 'make config' and enable loadable module support."
1268 @echo
>&2 "Then build a kernel with module support enabled."
1272 endif # CONFIG_MODULES
1275 # Cleaning is done on three levels.
1276 # make clean Delete most generated files
1277 # Leave enough to build external modules
1278 # make mrproper Delete the current configuration, and all generated files
1279 # make distclean Remove editor backup files, patch leftover files and the like
1281 # Directories & files removed with 'make clean'
1282 CLEAN_DIRS
+= $(MODVERDIR
)
1284 # Directories & files removed with 'make mrproper'
1285 MRPROPER_DIRS
+= include/config usr
/include include/generated \
1286 arch
/*/include/generated .tmp_objdiff
1287 MRPROPER_FILES
+= .config .config.old .version .old_version \
1288 Module.symvers
tags TAGS cscope
* GPATH GTAGS GRTAGS GSYMS \
1289 signing_key.pem signing_key.priv signing_key.x509 \
1290 x509.genkey extra_certificates signing_key.x509.keyid \
1291 signing_key.x509.signer vmlinux-gdb.py
1293 # clean - Delete most, but leave enough to build external modules
1295 clean: rm-dirs
:= $(CLEAN_DIRS
)
1296 clean: rm-files
:= $(CLEAN_FILES
)
1297 clean-dirs
:= $(addprefix _clean_
, .
$(vmlinux-alldirs
) Documentation samples
)
1299 PHONY
+= $(clean-dirs
) clean archclean vmlinuxclean
1301 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1304 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/link-vmlinux.sh
clean
1305 $(Q
)$(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) clean)
1307 clean: archclean vmlinuxclean
1309 # mrproper - Delete all generated files, including .config
1311 mrproper
: rm-dirs
:= $(wildcard $(MRPROPER_DIRS
))
1312 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
1313 mrproper-dirs
:= $(addprefix _mrproper_
,Documentation
/DocBook scripts
)
1315 PHONY
+= $(mrproper-dirs
) mrproper archmrproper
1317 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
1319 mrproper
: clean archmrproper
$(mrproper-dirs
)
1328 @find
$(srctree
) $(RCS_FIND_IGNORE
) \
1329 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
1330 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'*%' \
1331 -o
-name
'core' \
) \
1332 -type f
-print | xargs
rm -f
1335 # Packaging of the kernel to various formats
1336 # ---------------------------------------------------------------------------
1337 # rpm target kept for backward compatibility
1338 package-dir
:= scripts
/package
1341 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1342 %pkg
: include/config
/kernel.release FORCE
1343 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1344 rpm
: include/config
/kernel.release FORCE
1345 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1348 # Brief documentation of the typical targets used
1349 # ---------------------------------------------------------------------------
1351 boards
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*_defconfig
)
1352 boards
:= $(sort $(notdir $(boards
)))
1353 board-dirs
:= $(dir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*/*_defconfig
))
1354 board-dirs
:= $(sort $(notdir $(board-dirs
:/=)))
1358 @echo
'Cleaning targets:'
1359 @echo
' clean - Remove most generated files but keep the config and'
1360 @echo
' enough build support to build external modules'
1361 @echo
' mrproper - Remove all generated files + config + various backup files'
1362 @echo
' distclean - mrproper + remove editor backup and patch files'
1364 @echo
'Configuration targets:'
1365 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
1367 @echo
'Other generic targets:'
1368 @echo
' all - Build all targets marked with [*]'
1369 @echo
'* vmlinux - Build the bare kernel'
1370 @echo
'* modules - Build all modules'
1371 @echo
' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1372 @echo
' firmware_install- Install all firmware to INSTALL_FW_PATH'
1373 @echo
' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1374 @echo
' dir/ - Build all files in dir and below'
1375 @echo
' dir/file.[ois] - Build specified target only'
1376 @echo
' dir/file.ll - Build the LLVM assembly file'
1377 @echo
' (requires compiler support for LLVM assembly generation)'
1378 @echo
' dir/file.lst - Build specified mixed source/assembly target only'
1379 @echo
' (requires a recent binutils and recent build (System.map))'
1380 @echo
' dir/file.ko - Build module including final link'
1381 @echo
' modules_prepare - Set up for building external modules'
1382 @echo
' tags/TAGS - Generate tags file for editors'
1383 @echo
' cscope - Generate cscope index'
1384 @echo
' gtags - Generate GNU GLOBAL index'
1385 @echo
' kernelrelease - Output the release version string (use with make -s)'
1386 @echo
' kernelversion - Output the version stored in Makefile (use with make -s)'
1387 @echo
' image_name - Output the image name (use with make -s)'
1388 @echo
' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1389 echo
' (default: $(INSTALL_HDR_PATH))'; \
1391 @echo
'Static analysers'
1392 @echo
' checkstack - Generate a list of stack hogs'
1393 @echo
' namespacecheck - Name space analysis on compiled kernel'
1394 @echo
' versioncheck - Sanity check on version.h usage'
1395 @echo
' includecheck - Check for duplicate included header files'
1396 @echo
' export_report - List the usages of all exported symbols'
1397 @echo
' headers_check - Sanity check on exported headers'
1398 @echo
' headerdep - Detect inclusion cycles in headers'
1399 @
$(MAKE
) -f
$(srctree
)/scripts
/Makefile.help checker-help
1401 @echo
'Kernel selftest'
1402 @echo
' kselftest - Build and run kernel selftest (run as root)'
1403 @echo
' Build, install, and boot kernel before'
1404 @echo
' running kselftest on it'
1405 @echo
' kselftest-clean - Remove all generated kselftest files'
1406 @echo
' kselftest-merge - Merge all the config dependencies of kselftest to existed'
1409 @echo
'Kernel packaging:'
1410 @
$(MAKE
) $(build
)=$(package-dir
) help
1412 @echo
'Documentation targets:'
1413 @
$(MAKE
) -f
$(srctree
)/Documentation
/Makefile.sphinx dochelp
1415 @
$(MAKE
) -f
$(srctree
)/Documentation
/DocBook
/Makefile dochelp
1417 @echo
'Architecture specific targets ($(SRCARCH)):'
1418 @
$(if
$(archhelp
),$(archhelp
),\
1419 echo
' No architecture specific help defined for $(SRCARCH)')
1422 $(foreach b
, $(boards
), \
1423 printf
" %-24s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
1425 @
$(if
$(board-dirs
), \
1426 $(foreach b
, $(board-dirs
), \
1427 printf
" %-16s - Show %s-specific targets\\n" help-
$(b
) $(b
);) \
1428 printf
" %-16s - Show all of the above\\n" help-boards
; \
1431 @echo
' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1432 @echo
' make V=2 [targets] 2 => give reason for rebuild of target'
1433 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
1434 @echo
' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1435 @echo
' make C=2 [targets] Force check of all c source with $$CHECK'
1436 @echo
' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1437 @echo
' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1438 @echo
' 1: warnings which may be relevant and do not occur too often'
1439 @echo
' 2: warnings which occur quite often but may still be relevant'
1440 @echo
' 3: more obscure warnings, can most likely be ignored'
1441 @echo
' Multiple levels can be combined with W=12 or W=123'
1443 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
1444 @echo
'For further info see the ./README file'
1447 help-board-dirs
:= $(addprefix help-
,$(board-dirs
))
1449 help-boards
: $(help-board-dirs
)
1451 boards-per-dir
= $(sort $(notdir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/$*/*_defconfig
)))
1453 $(help-board-dirs
): help-
%:
1454 @echo
'Architecture specific targets ($(SRCARCH) $*):'
1455 @
$(if
$(boards-per-dir
), \
1456 $(foreach b
, $(boards-per-dir
), \
1457 printf
" %-24s - Build for %s\\n" $*/$(b
) $(subst _defconfig
,,$(b
));) \
1461 # Documentation targets
1462 # ---------------------------------------------------------------------------
1463 DOC_TARGETS
:= xmldocs sgmldocs psdocs latexdocs pdfdocs htmldocs mandocs installmandocs epubdocs cleandocs linkcheckdocs
1464 PHONY
+= $(DOC_TARGETS
)
1465 $(DOC_TARGETS
): scripts_basic FORCE
1466 $(Q
)$(MAKE
) $(build
)=scripts build_docproc build_check-lc_ctype
1467 $(Q
)$(MAKE
) $(build
)=Documentation
-f
$(srctree
)/Documentation
/Makefile.sphinx
$@
1468 $(Q
)$(MAKE
) $(build
)=Documentation
/DocBook
$@
1470 else # KBUILD_EXTMOD
1473 # External module support.
1474 # When building external modules the kernel used as basis is considered
1475 # read-only, and no consistency checks are made and the make
1476 # system is not used on the basis kernel. If updates are required
1477 # in the basis kernel ordinary make commands (without M=...) must
1480 # The following are the only valid targets when building external
1482 # make M=dir clean Delete all automatically generated files
1483 # make M=dir modules Make all modules in specified dir
1484 # make M=dir Same as 'make M=dir modules'
1485 # make M=dir modules_install
1486 # Install the modules built in the module directory
1487 # Assumes install directory is already created
1489 # We are always building modules
1491 PHONY
+= crmodverdir
1495 PHONY
+= $(objtree
)/Module.symvers
1496 $(objtree
)/Module.symvers
:
1497 @
test -e
$(objtree
)/Module.symvers ||
( \
1499 echo
" WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1500 echo
" is missing; modules will have no dependencies and modversions."; \
1503 module-dirs
:= $(addprefix _module_
,$(KBUILD_EXTMOD
))
1504 PHONY
+= $(module-dirs
) modules
1505 $(module-dirs
): crmodverdir
$(objtree
)/Module.symvers
1506 $(Q
)$(MAKE
) $(build
)=$(patsubst _module_
%,%,$@
)
1508 modules
: $(module-dirs
)
1509 @
$(kecho
) ' Building modules, stage 2.';
1510 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1512 PHONY
+= modules_install
1513 modules_install
: _emodinst_ _emodinst_post
1515 install-dir
:= $(if
$(INSTALL_MOD_DIR
),$(INSTALL_MOD_DIR
),extra
)
1518 $(Q
)mkdir
-p
$(MODLIB
)/$(install-dir
)
1519 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1521 PHONY
+= _emodinst_post
1522 _emodinst_post
: _emodinst_
1525 clean-dirs
:= $(addprefix _clean_
,$(KBUILD_EXTMOD
))
1527 PHONY
+= $(clean-dirs
) clean
1529 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1531 clean: rm-dirs
:= $(MODVERDIR
)
1532 clean: rm-files
:= $(KBUILD_EXTMOD
)/Module.symvers
1536 @echo
' Building external modules.'
1537 @echo
' Syntax: make -C path/to/kernel/src M=$$PWD target'
1539 @echo
' modules - default target, build the module(s)'
1540 @echo
' modules_install - install the module'
1541 @echo
' clean - remove generated files in module directory only'
1545 PHONY
+= prepare scripts
1548 endif # KBUILD_EXTMOD
1550 clean: $(clean-dirs
)
1553 @find
$(if
$(KBUILD_EXTMOD
), $(KBUILD_EXTMOD
), .
) $(RCS_FIND_IGNORE
) \
1554 \
( -name
'*.[oas]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
1558 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
1559 -o
-name
'*.symtypes' -o
-name
'modules.order' \
1560 -o
-name modules.builtin
-o
-name
'.tmp_*.o.*' \
1561 -o
-name
'*.c.[012]*.*' \
1563 -o
-name
'*.gcno' \
) -type f
-print | xargs
rm -f
1565 # Generate tags for editors
1566 # ---------------------------------------------------------------------------
1567 quiet_cmd_tags
= GEN
$@
1568 cmd_tags
= $(CONFIG_SHELL
) $(srctree
)/scripts
/tags.sh
$@
1570 tags TAGS cscope gtags
: FORCE
1573 # Scripts to check various things for consistency
1574 # ---------------------------------------------------------------------------
1576 PHONY
+= includecheck versioncheck coccicheck namespacecheck export_report
1579 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1580 -name
'*.[hcS]' -type f
-print |
sort \
1581 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkincludes.pl
1584 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1585 -name
'*.[hcS]' -type f
-print |
sort \
1586 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkversion.pl
1589 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/$@
1592 $(PERL
) $(srctree
)/scripts
/namespace.pl
1595 $(PERL
) $(srctree
)/scripts
/export_report.pl
1597 endif #ifeq ($(config-targets),1)
1598 endif #ifeq ($(mixed-targets),1)
1600 PHONY
+= checkstack kernelrelease kernelversion image_name
1602 # UML needs a little special treatment here. It wants to use the host
1603 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1604 # else wants $(ARCH), including people doing cross-builds, which means
1605 # that $(SUBARCH) doesn't work here.
1607 CHECKSTACK_ARCH
:= $(SUBARCH
)
1609 CHECKSTACK_ARCH
:= $(ARCH
)
1612 $(OBJDUMP
) -d vmlinux
$$(find .
-name
'*.ko') | \
1613 $(PERL
) $(src
)/scripts
/checkstack.pl
$(CHECKSTACK_ARCH
)
1616 @echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1619 @echo
$(KERNELVERSION
)
1622 @echo
$(KBUILD_IMAGE
)
1624 # Clear a bunch of variables before executing the submake
1626 $(Q
)mkdir
-p
$(objtree
)/tools
1627 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(shell cd
$(objtree
) && /bin
/pwd
) subdir
=tools
-C
$(src
)/tools
/
1630 $(Q
)mkdir
-p
$(objtree
)/tools
1631 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(shell cd
$(objtree
) && /bin
/pwd
) subdir
=tools
-C
$(src
)/tools
/ $*
1634 # ---------------------------------------------------------------------------
1635 # Single targets are compatible with:
1636 # - build with mixed source and output
1637 # - build with separate output dir 'make O=...'
1638 # - external modules
1640 # target-dir => where to store outputfile
1641 # build-dir => directory in kernel source tree to use
1643 ifeq ($(KBUILD_EXTMOD
),)
1644 build-dir
= $(patsubst %/,%,$(dir $@
))
1645 target-dir
= $(dir $@
)
1647 zap-slash
=$(filter-out .
,$(patsubst %/,%,$(dir $@
)))
1648 build-dir
= $(KBUILD_EXTMOD
)$(if
$(zap-slash
),/$(zap-slash
))
1649 target-dir
= $(if
$(KBUILD_EXTMOD
),$(dir $<),$(dir $@
))
1652 %.s
: %.c prepare scripts FORCE
1653 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1654 %.i
: %.c prepare scripts FORCE
1655 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1656 %.o
: %.c prepare scripts FORCE
1657 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1658 %.lst
: %.c prepare scripts FORCE
1659 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1660 %.s
: %.S prepare scripts FORCE
1661 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1662 %.o
: %.S prepare scripts FORCE
1663 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1664 %.symtypes
: %.c prepare scripts FORCE
1665 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1666 %.ll
: %.c prepare scripts FORCE
1667 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1670 /: prepare scripts FORCE
1672 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1673 $(build
)=$(build-dir
)
1674 # Make sure the latest headers are built for Documentation
1675 Documentation
/ samples
/: headers_install
1676 %/: prepare scripts FORCE
1678 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1679 $(build
)=$(build-dir
)
1680 %.ko
: prepare scripts FORCE
1682 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1683 $(build
)=$(build-dir
) $(@
:.ko
=.o
)
1684 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1686 # FIXME Should go into a make.lib or something
1687 # ===========================================================================
1689 quiet_cmd_rmdirs
= $(if
$(wildcard $(rm-dirs
)),CLEAN
$(wildcard $(rm-dirs
)))
1690 cmd_rmdirs
= rm -rf
$(rm-dirs
)
1692 quiet_cmd_rmfiles
= $(if
$(wildcard $(rm-files
)),CLEAN
$(wildcard $(rm-files
)))
1693 cmd_rmfiles
= rm -f
$(rm-files
)
1695 # Run depmod only if we have System.map and depmod is executable
1696 quiet_cmd_depmod
= DEPMOD
$(KERNELRELEASE
)
1697 cmd_depmod
= $(CONFIG_SHELL
) $(srctree
)/scripts
/depmod.sh
$(DEPMOD
) \
1698 $(KERNELRELEASE
) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1700 # Create temporary dir for module support files
1701 # clean it up only when building all modules
1702 cmd_crmodverdir
= $(Q
)mkdir
-p
$(MODVERDIR
) \
1703 $(if
$(KBUILD_MODULES
),; rm -f
$(MODVERDIR
)/*)
1705 # read all saved command lines
1707 targets
:= $(wildcard $(sort $(targets
)))
1708 cmd_files
:= $(wildcard .
*.cmd
$(foreach f
,$(targets
),$(dir $(f
)).
$(notdir $(f
)).cmd
))
1710 ifneq ($(cmd_files
),)
1711 $(cmd_files
): ; # Do not try to update included dependency files
1712 include $(cmd_files
)
1715 endif # skip-makefile
1720 # Declare the contents of the .PHONY variable as phony. We keep that
1721 # information in a variable so we can use it in if_changed and friends.