1 # SPDX-License-Identifier: GPL-2.0
9 # To see a list of typical targets execute "make help"
10 # More info can be located in ./README
11 # Comments in this file are targeted only to the developer, do not
12 # expect to learn how to build the kernel reading this file.
14 # That's our default target when none is given on the command line
18 # o Do not use make's built-in rules and variables
19 # (this increases performance and avoids hard-to-debug behaviour);
20 # o Look for make include files relative to root of kernel src
21 MAKEFLAGS
+= -rR
--include-dir
=$(CURDIR
)
23 # Avoid funny character set dependencies
27 export LC_COLLATE LC_NUMERIC
29 # Avoid interference with shell env settings
32 # We are using a recursive build, so we need to do a little thinking
33 # to get the ordering right.
35 # Most importantly: sub-Makefiles should only ever modify files in
36 # their own directory. If in some directory we have a dependency on
37 # a file in another dir (which doesn't happen often, but it's often
38 # unavoidable when linking the built-in.o targets which finally
39 # turn into vmlinux), we will call a sub make in that other dir, and
40 # after that we are sure that everything which is in that other dir
43 # The only cases where we need to modify files which have global
44 # effects are thus separated out and done before the recursive
45 # descending is started. They are now explicitly listed as the
49 # ---------------------------------------------------------------------------
51 # Normally, we echo the whole command before executing it. By making
52 # that echo $($(quiet)$(cmd)), we now have the possibility to set
53 # $(quiet) to choose other forms of output instead, e.g.
55 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
56 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
58 # If $(quiet) is empty, the whole command will be printed.
59 # If it is set to "quiet_", only the short version will be printed.
60 # If it is set to "silent_", nothing will be printed at all, since
61 # the variable $(silent_cmd_cc_o_c) doesn't exist.
63 # A simple variant is to prefix commands with $(Q) - that's useful
64 # for commands that shall be hidden in non-verbose mode.
68 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
69 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
71 # To put more focus on warnings, be less verbose as default
72 # Use 'make V=1' to see the full commands
74 ifeq ("$(origin V)", "command line")
81 ifeq ($(KBUILD_VERBOSE
),1)
89 # If the user is running make -s (silent mode), suppress echoing of
92 ifneq ($(findstring s
,$(filter-out --%,$(MAKEFLAGS
))),)
97 export quiet Q KBUILD_VERBOSE
99 # kbuild supports saving output files in a separate directory.
100 # To locate output files in a separate directory two syntaxes are supported.
101 # In both cases the working directory must be the root of the kernel src.
103 # Use "make O=dir/to/store/output/files/"
105 # 2) Set KBUILD_OUTPUT
106 # Set the environment variable KBUILD_OUTPUT to point to the directory
107 # where the output files shall be placed.
108 # export KBUILD_OUTPUT=dir/to/store/output/files/
111 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
114 # KBUILD_SRC is not intended to be used by the regular user (for now),
115 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
116 ifeq ($(KBUILD_SRC
),)
118 # OK, Make called in directory where kernel src resides
119 # Do we want to locate output files in a separate directory?
120 ifeq ("$(origin O)", "command line")
121 KBUILD_OUTPUT
:= $(O
)
124 # Cancel implicit rules on top Makefile
125 $(CURDIR
)/Makefile Makefile
: ;
127 ifneq ($(words $(subst :, ,$(CURDIR
))), 1)
128 $(error main directory cannot contain spaces nor colons
)
131 ifneq ($(KBUILD_OUTPUT
),)
132 # check that the output directory actually exists
133 saved-output
:= $(KBUILD_OUTPUT
)
134 KBUILD_OUTPUT
:= $(shell mkdir
-p
$(KBUILD_OUTPUT
) && cd
$(KBUILD_OUTPUT
) \
136 $(if
$(KBUILD_OUTPUT
),, \
137 $(error failed to create output directory
"$(saved-output)"))
139 PHONY
+= $(MAKECMDGOALS
) sub-make
141 $(filter-out _all sub-make
$(CURDIR
)/Makefile
, $(MAKECMDGOALS
)) _all
: sub-make
144 # Invoke a second make in the output directory, passing relevant variables
146 $(Q
)$(MAKE
) -C
$(KBUILD_OUTPUT
) KBUILD_SRC
=$(CURDIR
) \
147 -f
$(CURDIR
)/Makefile
$(filter-out _all sub-make
,$(MAKECMDGOALS
))
149 # Leave processing to above invocation of make
151 endif # ifneq ($(KBUILD_OUTPUT),)
152 endif # ifeq ($(KBUILD_SRC),)
154 # We process the rest of the Makefile if this is the final invocation of make
155 ifeq ($(skip-makefile
),)
157 # Do not print "Entering directory ...",
158 # but we want to display it when entering to the output directory
159 # so that IDEs/editors are able to understand relative filenames.
160 MAKEFLAGS
+= --no-print-directory
162 # Call a source code checker (by default, "sparse") as part of the
165 # Use 'make C=1' to enable checking of only re-compiled files.
166 # Use 'make C=2' to enable checking of *all* source files, regardless
167 # of whether they are re-compiled or not.
169 # See the file "Documentation/dev-tools/sparse.rst" for more details,
170 # including where to get the "sparse" utility.
172 ifeq ("$(origin C)", "command line")
173 KBUILD_CHECKSRC
= $(C
)
175 ifndef KBUILD_CHECKSRC
179 # Use make M=dir to specify directory of external module to build
180 # Old syntax make ... SUBDIRS=$PWD is still supported
181 # Setting the environment variable KBUILD_EXTMOD take precedence
183 KBUILD_EXTMOD ?
= $(SUBDIRS
)
186 ifeq ("$(origin M)", "command line")
187 KBUILD_EXTMOD
:= $(M
)
190 ifeq ($(KBUILD_SRC
),)
191 # building in the source tree
194 ifeq ($(KBUILD_SRC
)/,$(dir $(CURDIR
)))
195 # building in a subdirectory of the source tree
198 srctree
:= $(KBUILD_SRC
)
202 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
208 VPATH
:= $(srctree
)$(if
$(KBUILD_EXTMOD
),:$(KBUILD_EXTMOD
))
210 export srctree objtree VPATH
212 # To make sure we do not include .config for any of the *config targets
213 # catch them early, and hand them over to scripts/kconfig/Makefile
214 # It is allowed to specify more targets when calling make, including
215 # mixing *config targets and build targets.
216 # For example 'make oldconfig all'.
217 # Detect when mixed targets is specified, and make a second invocation
218 # of make so .config is not included in this case either (for *config).
220 version_h
:= include/generated
/uapi
/linux
/version.h
221 old_version_h
:= include/linux
/version.h
223 no-dot-config-targets
:= clean mrproper
distclean \
224 cscope gtags TAGS
tags help
% %docs
check% coccicheck \
225 $(version_h
) headers_
% archheaders archscripts \
226 kernelversion
%src-pkg
232 ifneq ($(filter $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
233 ifeq ($(filter-out $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
238 ifeq ($(KBUILD_EXTMOD
),)
239 ifneq ($(filter config
%config
,$(MAKECMDGOALS
)),)
241 ifneq ($(words $(MAKECMDGOALS
)),1)
246 # install and modules_install need also be processed one by one
247 ifneq ($(filter install,$(MAKECMDGOALS
)),)
248 ifneq ($(filter modules_install
,$(MAKECMDGOALS
)),)
253 ifeq ($(mixed-targets
),1)
254 # ===========================================================================
255 # We're called with mixed targets (*config and build targets).
256 # Handle them one by one.
258 PHONY
+= $(MAKECMDGOALS
) __build_one_by_one
260 $(filter-out __build_one_by_one
, $(MAKECMDGOALS
)): __build_one_by_one
265 for i in
$(MAKECMDGOALS
); do \
266 $(MAKE
) -f
$(srctree
)/Makefile
$$i; \
271 # We need some generic definitions (do not try to remake the file).
272 scripts
/Kbuild.
include: ;
273 include scripts
/Kbuild.
include
275 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
276 KERNELRELEASE
= $(shell cat
include/config
/kernel.release
2> /dev
/null
)
277 KERNELVERSION
= $(VERSION
)$(if
$(PATCHLEVEL
),.
$(PATCHLEVEL
)$(if
$(SUBLEVEL
),.
$(SUBLEVEL
)))$(EXTRAVERSION
)
278 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
280 # SUBARCH tells the usermode build what the underlying arch is. That is set
281 # first, and if a usermode build is happening, the "ARCH=um" on the command
282 # line overrides the setting of ARCH below. If a native build is happening,
283 # then ARCH is assigned, getting whatever value it gets normally, and
284 # SUBARCH is subsequently ignored.
286 SUBARCH
:= $(shell uname
-m | sed
-e s
/i
.86/x86
/ -e s
/x86_64
/x86
/ \
287 -e s
/sun4u
/sparc64
/ \
288 -e s
/arm.
*/arm
/ -e s
/sa110
/arm
/ \
289 -e s
/s390x
/s390
/ -e s
/parisc64
/parisc
/ \
290 -e s
/ppc.
*/powerpc
/ -e s
/mips.
*/mips
/ \
291 -e s
/sh
[234].
*/sh
/ -e s
/aarch64.
*/arm64
/ )
293 # Cross compiling and selecting different set of gcc/bin-utils
294 # ---------------------------------------------------------------------------
296 # When performing cross compilation for other architectures ARCH shall be set
297 # to the target architecture. (See arch/* for the possibilities).
298 # ARCH can be set during invocation of make:
300 # Another way is to have ARCH set in the environment.
301 # The default ARCH is the host where make is executed.
303 # CROSS_COMPILE specify the prefix used for all executables used
304 # during compilation. Only gcc and related bin-utils executables
305 # are prefixed with $(CROSS_COMPILE).
306 # CROSS_COMPILE can be set on the command line
307 # make CROSS_COMPILE=ia64-linux-
308 # Alternatively CROSS_COMPILE can be set in the environment.
309 # A third alternative is to store a setting in .config so that plain
310 # "make" in the configured kernel build directory always uses that.
311 # Default value for CROSS_COMPILE is not to prefix executables
312 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
314 CROSS_COMPILE ?
= $(CONFIG_CROSS_COMPILE
:"%"=%)
316 # Architecture as present in compile.h
317 UTS_MACHINE
:= $(ARCH
)
320 # Additional ARCH settings for x86
324 ifeq ($(ARCH
),x86_64
)
328 # Additional ARCH settings for sparc
329 ifeq ($(ARCH
),sparc32
)
332 ifeq ($(ARCH
),sparc64
)
336 # Additional ARCH settings for sh
341 # Additional ARCH settings for tile
342 ifeq ($(ARCH
),tilepro
)
345 ifeq ($(ARCH
),tilegx
)
349 # Where to locate arch specific headers
350 hdr-arch
:= $(SRCARCH
)
352 KCONFIG_CONFIG ?
= .config
353 export KCONFIG_CONFIG
355 # SHELL used by kbuild
356 CONFIG_SHELL
:= $(shell if
[ -x
"$$BASH" ]; then echo
$$BASH; \
357 else if
[ -x
/bin
/bash
]; then echo
/bin
/bash
; \
358 else echo sh
; fi
; fi
)
360 HOST_LFS_CFLAGS
:= $(shell getconf LFS_CFLAGS
)
361 HOST_LFS_LDFLAGS
:= $(shell getconf LFS_LDFLAGS
)
362 HOST_LFS_LIBS
:= $(shell getconf LFS_LIBS
)
366 HOSTCFLAGS
:= -Wall
-Wmissing-prototypes
-Wstrict-prototypes
-O2 \
367 -fomit-frame-pointer
-std
=gnu89
$(HOST_LFS_CFLAGS
)
368 HOSTCXXFLAGS
:= -O2
$(HOST_LFS_CFLAGS
)
369 HOSTLDFLAGS
:= $(HOST_LFS_LDFLAGS
)
370 HOST_LOADLIBES
:= $(HOST_LFS_LIBS
)
372 # Make variables (CC, etc...)
373 AS
= $(CROSS_COMPILE
)as
374 LD
= $(CROSS_COMPILE
)ld
375 LDGOLD
= $(CROSS_COMPILE
)ld.gold
376 CC
= $(CROSS_COMPILE
)gcc
378 AR
= $(CROSS_COMPILE
)ar
379 NM
= $(CROSS_COMPILE
)nm
380 STRIP
= $(CROSS_COMPILE
)strip
381 OBJCOPY
= $(CROSS_COMPILE
)objcopy
382 OBJDUMP
= $(CROSS_COMPILE
)objdump
384 GENKSYMS
= scripts
/genksyms
/genksyms
385 INSTALLKERNEL
:= installkernel
386 DEPMOD
= /sbin
/depmod
391 CHECKFLAGS
:= -D__linux__
-Dlinux
-D__STDC__
-Dunix
-D__unix__ \
392 -Wbitwise
-Wno-return-void
$(CF
)
401 # Use USERINCLUDE when you must reference the UAPI directories only.
403 -I
$(srctree
)/arch
/$(hdr-arch
)/include/uapi \
404 -I
$(objtree
)/arch
/$(hdr-arch
)/include/generated
/uapi \
405 -I
$(srctree
)/include/uapi \
406 -I
$(objtree
)/include/generated
/uapi \
407 -include $(srctree
)/include/linux
/kconfig.h
409 # Use LINUXINCLUDE when you must reference the include/ directory.
410 # Needed to be compatible with the O= option
412 -I
$(srctree
)/arch
/$(hdr-arch
)/include \
413 -I
$(objtree
)/arch
/$(hdr-arch
)/include/generated \
414 $(if
$(KBUILD_SRC
), -I
$(srctree
)/include) \
415 -I
$(objtree
)/include \
418 KBUILD_AFLAGS
:= -D__ASSEMBLY__
419 KBUILD_CFLAGS
:= -Wall
-Wundef
-Wstrict-prototypes
-Wno-trigraphs \
420 -fno-strict-aliasing
-fno-common
-fshort-wchar \
421 -Werror-implicit-function-declaration \
422 -Wno-format-security \
424 KBUILD_CPPFLAGS
:= -D__KERNEL__
425 KBUILD_AFLAGS_KERNEL
:=
426 KBUILD_CFLAGS_KERNEL
:=
427 KBUILD_AFLAGS_MODULE
:= -DMODULE
428 KBUILD_CFLAGS_MODULE
:= -DMODULE
429 KBUILD_LDFLAGS_MODULE
:= -T
$(srctree
)/scripts
/module-common.lds
430 GCC_PLUGINS_CFLAGS
:=
432 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
433 export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
434 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
435 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
437 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
438 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
439 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
440 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
441 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
442 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
443 export KBUILD_ARFLAGS
445 # When compiling out-of-tree modules, put MODVERDIR in the module
446 # tree rather than in the kernel tree. The kernel tree might
448 export MODVERDIR
:= $(if
$(KBUILD_EXTMOD
),$(firstword $(KBUILD_EXTMOD
))/).tmp_versions
450 # Files to ignore in find ... statements
452 export RCS_FIND_IGNORE
:= \
( -name SCCS
-o
-name BitKeeper
-o
-name .svn
-o \
453 -name CVS
-o
-name .
pc -o
-name .hg
-o
-name .git \
) \
455 export RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn \
456 --exclude CVS
--exclude .
pc --exclude .hg
--exclude .git
458 # ===========================================================================
459 # Rules shared between *config targets and build targets
461 # Basic helpers built in scripts/basic/
462 PHONY
+= scripts_basic
464 $(Q
)$(MAKE
) $(build
)=scripts
/basic
465 $(Q
)rm -f .tmp_quiet_recordmcount
467 # To avoid any implicit rule to kick in, define an empty command.
468 scripts
/basic
/%: scripts_basic
;
470 PHONY
+= outputmakefile
471 # outputmakefile generates a Makefile in the output directory, if using a
472 # separate output directory. This allows convenient use of make in the
475 ifneq ($(KBUILD_SRC
),)
476 $(Q
)ln
-fsn
$(srctree
) source
477 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/mkmakefile \
478 $(srctree
) $(objtree
) $(VERSION
) $(PATCHLEVEL
)
481 ifeq ($(cc-name
),clang
)
482 ifneq ($(CROSS_COMPILE
),)
483 CLANG_TRIPLE ?
= $(CROSS_COMPILE
)
484 CLANG_TARGET
:= --target
=$(notdir $(CLANG_TRIPLE
:%-=%))
485 GCC_TOOLCHAIN
:= $(realpath
$(dir $(shell which
$(LD
)))/..
)
487 ifneq ($(GCC_TOOLCHAIN
),)
488 CLANG_GCC_TC
:= --gcc-toolchain
=$(GCC_TOOLCHAIN
)
490 KBUILD_CFLAGS
+= $(CLANG_TARGET
) $(CLANG_GCC_TC
)
491 KBUILD_AFLAGS
+= $(CLANG_TARGET
) $(CLANG_GCC_TC
)
494 RETPOLINE_CFLAGS_GCC
:= -mindirect-branch
=thunk-extern
-mindirect-branch-register
495 RETPOLINE_CFLAGS_CLANG
:= -mretpoline-external-thunk
496 RETPOLINE_CFLAGS
:= $(call cc-option
,$(RETPOLINE_CFLAGS_GCC
),$(call cc-option
,$(RETPOLINE_CFLAGS_CLANG
)))
497 export RETPOLINE_CFLAGS
499 ifeq ($(config-targets
),1)
500 # ===========================================================================
501 # *config targets only - make sure prerequisites are updated, and descend
502 # in scripts/kconfig to make the *config target
504 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
505 # KBUILD_DEFCONFIG may point out an alternative default configuration
506 # used for 'make defconfig'
507 include arch
/$(SRCARCH
)/Makefile
508 export KBUILD_DEFCONFIG KBUILD_KCONFIG
510 config
: scripts_basic outputmakefile FORCE
511 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
513 %config
: scripts_basic outputmakefile FORCE
514 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
517 # ===========================================================================
518 # Build targets only - this includes vmlinux, arch specific targets, clean
519 # targets and others. In general all targets except *config targets.
521 # If building an external module we do not care about the all: rule
522 # but instead _all depend on modules
524 ifeq ($(KBUILD_EXTMOD
),)
530 # Decide whether to build built-in, modular, or both.
531 # Normally, just do built-in.
536 # If we have only "make modules", don't compile built-in objects.
537 # When we're building modules with modversions, we need to consider
538 # the built-in objects during the descend as well, in order to
539 # make sure the checksums are up to date before we record them.
541 ifeq ($(MAKECMDGOALS
),modules
)
542 KBUILD_BUILTIN
:= $(if
$(CONFIG_MODVERSIONS
),1)
545 # If we have "make <whatever> modules", compile modules
546 # in addition to whatever we do anyway.
547 # Just "make" or "make all" shall build modules as well
549 ifneq ($(filter all _all modules
,$(MAKECMDGOALS
)),)
553 ifeq ($(MAKECMDGOALS
),)
557 export KBUILD_MODULES KBUILD_BUILTIN
559 ifeq ($(KBUILD_EXTMOD
),)
560 # Additional helpers built in scripts/
561 # Carefully list dependencies so we do not try to build scripts twice
564 scripts
: scripts_basic
include/config
/auto.conf
include/config
/tristate.conf \
565 asm-generic gcc-plugins
566 $(Q
)$(MAKE
) $(build
)=$(@
)
568 # Objects we will link into vmlinux / subdirs we need to visit
570 drivers-y
:= drivers
/ sound
/ firmware
/
575 endif # KBUILD_EXTMOD
577 ifeq ($(dot-config
),1)
579 -include include/config
/auto.conf
581 ifeq ($(KBUILD_EXTMOD
),)
582 # Read in dependencies to all Kconfig* files, make sure to run
583 # oldconfig if changes are detected.
584 -include include/config
/auto.conf.cmd
586 # To avoid any implicit rule to kick in, define an empty command
587 $(KCONFIG_CONFIG
) include/config
/auto.conf.cmd
: ;
589 # If .config is newer than include/config/auto.conf, someone tinkered
590 # with it and forgot to run make oldconfig.
591 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
592 # we execute the config step to be sure to catch updated Kconfig files
593 include/config
/%.conf
: $(KCONFIG_CONFIG
) include/config
/auto.conf.cmd
594 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile silentoldconfig
596 # external modules needs include/generated/autoconf.h and include/config/auto.conf
597 # but do not care if they are up-to-date. Use auto.conf to trigger the test
598 PHONY
+= include/config
/auto.conf
600 include/config
/auto.conf
:
601 $(Q
)test -e
include/generated
/autoconf.h
-a
-e
$@ ||
( \
603 echo
>&2 " ERROR: Kernel configuration is invalid."; \
604 echo
>&2 " include/generated/autoconf.h or $@ are missing.";\
605 echo
>&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
609 endif # KBUILD_EXTMOD
612 # Dummy target needed, because used as prerequisite
613 include/config
/auto.conf
: ;
614 endif # $(dot-config)
616 # For the kernel to actually contain only the needed exported symbols,
617 # we have to build modules as well to determine what those symbols are.
618 # (this can be evaluated only once include/config/auto.conf has been included)
619 ifdef CONFIG_TRIM_UNUSED_KSYMS
623 # The all: target is the default when no target is given on the
625 # This allow a user to issue only 'make' to build a kernel including modules
626 # Defaults to vmlinux, but the arch makefile usually adds further targets
629 KBUILD_CFLAGS
+= $(call cc-option
,-fno-PIE
)
630 KBUILD_AFLAGS
+= $(call cc-option
,-fno-PIE
)
631 CFLAGS_GCOV
:= -fprofile-arcs
-ftest-coverage
-fno-tree-loop-im
$(call cc-disable-warning
,maybe-uninitialized
,)
632 CFLAGS_KCOV
:= $(call cc-option
,-fsanitize-coverage
=trace-pc
,)
633 export CFLAGS_GCOV CFLAGS_KCOV
635 # Make toolchain changes before including arch/$(SRCARCH)/Makefile to ensure
636 # ar/cc/ld-* macros return correct values.
637 ifdef CONFIG_LTO_CLANG
638 # use GNU gold with LLVMgold for LTO linking, and LD for vmlinux_link
639 LDFINAL_vmlinux
:= $(LD
)
641 LDFLAGS
+= -plugin LLVMgold.so
642 # use llvm-ar for building symbol tables from IR files, and llvm-dis instead
643 # of objdump for processing symbol versions and exports
646 export LLVM_AR LLVM_DIS
649 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
650 # values of the respective KBUILD_* variables
654 include arch
/$(SRCARCH
)/Makefile
656 KBUILD_CFLAGS
+= $(call cc-option
,-fno-delete-null-pointer-checks
,)
657 KBUILD_CFLAGS
+= $(call cc-disable-warning
,frame-address
,)
658 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-truncation
)
659 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-overflow
)
660 KBUILD_CFLAGS
+= $(call cc-disable-warning
, int-in-bool-context
)
661 KBUILD_CFLAGS
+= $(call cc-disable-warning
, attribute-alias
)
663 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
664 KBUILD_CFLAGS
+= $(call cc-option
,-Oz
,-Os
)
665 KBUILD_CFLAGS
+= $(call cc-disable-warning
,maybe-uninitialized
,)
667 ifdef CONFIG_PROFILE_ALL_BRANCHES
668 KBUILD_CFLAGS
+= -O2
$(call cc-disable-warning
,maybe-uninitialized
,)
674 KBUILD_CFLAGS
+= $(call cc-ifversion
, -lt
, 0409, \
675 $(call cc-disable-warning
,maybe-uninitialized
,))
677 # Tell gcc to never replace conditional load with a non-conditional one
678 KBUILD_CFLAGS
+= $(call cc-option
,--param
=allow-store-data-races
=0)
680 # check for 'asm goto'
681 ifeq ($(shell $(CONFIG_SHELL
) $(srctree
)/scripts
/gcc-goto.sh
$(CC
) $(KBUILD_CFLAGS
)), y
)
682 KBUILD_CFLAGS
+= -DCC_HAVE_ASM_GOTO
683 KBUILD_AFLAGS
+= -DCC_HAVE_ASM_GOTO
686 include scripts
/Makefile.gcc-plugins
688 ifdef CONFIG_READABLE_ASM
689 # Disable optimizations that make assembler listings hard to read.
690 # reorder blocks reorders the control in the function
691 # ipa clone creates specialized cloned functions
692 # partial inlining inlines only parts of functions
693 KBUILD_CFLAGS
+= $(call cc-option
,-fno-reorder-blocks
,) \
694 $(call cc-option
,-fno-ipa-cp-clone
,) \
695 $(call cc-option
,-fno-partial-inlining
)
698 ifneq ($(CONFIG_FRAME_WARN
),0)
699 KBUILD_CFLAGS
+= $(call cc-option
,-Wframe-larger-than
=${CONFIG_FRAME_WARN})
702 # This selects the stack protector compiler flag. Testing it is delayed
703 # until after .config has been reprocessed, in the prepare-compiler-check
705 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
706 stackp-flag
:= -fstack-protector
707 stackp-name
:= REGULAR
709 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
710 stackp-flag
:= -fstack-protector-strong
711 stackp-name
:= STRONG
713 # Force off for distro compilers that enable stack protector by default.
714 stackp-flag
:= $(call cc-option
, -fno-stack-protector
)
717 # Find arch-specific stack protector compiler sanity-checking script.
718 ifdef CONFIG_CC_STACKPROTECTOR
719 stackp-path
:= $(srctree
)/scripts
/gcc-
$(SRCARCH
)_
$(BITS
)-has-stack-protector.sh
720 stackp-check
:= $(wildcard $(stackp-path
))
722 KBUILD_CFLAGS
+= $(stackp-flag
)
724 ifeq ($(cc-name
),clang
)
725 KBUILD_CPPFLAGS
+= $(call cc-option
,-Qunused-arguments
,)
726 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-invalid-specifier
)
727 KBUILD_CFLAGS
+= $(call cc-disable-warning
, gnu
)
728 KBUILD_CFLAGS
+= $(call cc-disable-warning
, address-of-packed-member
)
729 KBUILD_CFLAGS
+= $(call cc-disable-warning
, duplicate-decl-specifier
)
730 # Quiet clang warning: comparison of unsigned expression < 0 is always false
731 KBUILD_CFLAGS
+= $(call cc-disable-warning
, tautological-compare
)
732 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
733 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
734 # See modpost pattern 2
735 KBUILD_CFLAGS
+= $(call cc-option
, -mno-global-merge
,)
736 KBUILD_CFLAGS
+= $(call cc-option
, -fcatch-undefined-behavior
)
737 KBUILD_CFLAGS
+= $(call cc-option
, -no-integrated-as
)
738 KBUILD_AFLAGS
+= $(call cc-option
, -no-integrated-as
)
741 # These warnings generated too much noise in a regular build.
742 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
743 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-but-set-variable
)
746 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-const-variable
)
747 ifdef CONFIG_FRAME_POINTER
748 KBUILD_CFLAGS
+= -fno-omit-frame-pointer
-fno-optimize-sibling-calls
750 # Some targets (ARM with Thumb2, for example), can't be built with frame
751 # pointers. For those, we don't have FUNCTION_TRACER automatically
752 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
753 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
754 # -fomit-frame-pointer with FUNCTION_TRACER.
755 ifndef CONFIG_FUNCTION_TRACER
756 KBUILD_CFLAGS
+= -fomit-frame-pointer
760 KBUILD_CFLAGS
+= $(call cc-option
, -fno-var-tracking-assignments
)
762 ifdef CONFIG_DEBUG_INFO
763 ifdef CONFIG_DEBUG_INFO_SPLIT
764 KBUILD_CFLAGS
+= $(call cc-option
, -gsplit-dwarf
, -g
)
768 KBUILD_AFLAGS
+= -Wa
,-gdwarf-2
770 ifdef CONFIG_DEBUG_INFO_DWARF4
771 KBUILD_CFLAGS
+= $(call cc-option
, -gdwarf-4
,)
774 ifdef CONFIG_DEBUG_INFO_REDUCED
775 KBUILD_CFLAGS
+= $(call cc-option
, -femit-struct-debug-baseonly
) \
776 $(call cc-option
,-fno-var-tracking
)
779 ifdef CONFIG_FUNCTION_TRACER
780 ifndef CC_FLAGS_FTRACE
781 CC_FLAGS_FTRACE
:= -pg
783 export CC_FLAGS_FTRACE
784 ifdef CONFIG_HAVE_FENTRY
785 CC_USING_FENTRY
:= $(call cc-option
, -mfentry
-DCC_USING_FENTRY
)
787 KBUILD_CFLAGS
+= $(CC_FLAGS_FTRACE
) $(CC_USING_FENTRY
)
788 KBUILD_AFLAGS
+= $(CC_USING_FENTRY
)
789 ifdef CONFIG_DYNAMIC_FTRACE
790 ifdef CONFIG_HAVE_C_RECORDMCOUNT
791 BUILD_C_RECORDMCOUNT
:= y
792 export BUILD_C_RECORDMCOUNT
797 # We trigger additional mismatches with less inlining
798 ifdef CONFIG_DEBUG_SECTION_MISMATCH
799 KBUILD_CFLAGS
+= $(call cc-option
, -fno-inline-functions-called-once
)
802 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
803 KBUILD_CFLAGS
+= $(call cc-option
,-ffunction-sections
,)
804 KBUILD_CFLAGS
+= $(call cc-option
,-fdata-sections
,)
807 ifdef CONFIG_LTO_CLANG
808 lto-clang-flags
:= -flto
-fvisibility
=hidden
810 # allow disabling only clang LTO where needed
811 DISABLE_LTO_CLANG
:= -fno-lto
-fvisibility
=default
812 export DISABLE_LTO_CLANG
816 lto-flags
:= $(lto-clang-flags
)
817 KBUILD_CFLAGS
+= $(lto-flags
)
819 DISABLE_LTO
:= $(DISABLE_LTO_CLANG
)
822 # LDFINAL_vmlinux and LDFLAGS_FINAL_vmlinux can be set to override
823 # the linker and flags for vmlinux_link.
824 export LDFINAL_vmlinux LDFLAGS_FINAL_vmlinux
827 ifdef CONFIG_CFI_CLANG
828 cfi-clang-flags
+= -fsanitize
=cfi
829 DISABLE_CFI_CLANG
:= -fno-sanitize
=cfi
831 cfi-clang-flags
+= -fsanitize-cfi-cross-dso
832 DISABLE_CFI_CLANG
+= -fno-sanitize-cfi-cross-dso
834 ifdef CONFIG_CFI_PERMISSIVE
835 cfi-clang-flags
+= -fsanitize-recover
=cfi
-fno-sanitize-trap
=cfi
838 # also disable CFI when LTO is disabled
839 DISABLE_LTO_CLANG
+= $(DISABLE_CFI_CLANG
)
840 # allow disabling only clang CFI where needed
841 export DISABLE_CFI_CLANG
845 # cfi-flags are re-tested in prepare-compiler-check
846 cfi-flags
:= $(cfi-clang-flags
)
847 KBUILD_CFLAGS
+= $(cfi-flags
)
849 DISABLE_CFI
:= $(DISABLE_CFI_CLANG
)
850 DISABLE_LTO
+= $(DISABLE_CFI
)
854 # arch Makefile may override CC so keep this after arch Makefile is included
855 NOSTDINC_FLAGS
+= -nostdinc
-isystem
$(shell $(CC
) -print-file-name
=include)
856 CHECKFLAGS
+= $(NOSTDINC_FLAGS
)
858 # warn about C99 declaration after statement
859 KBUILD_CFLAGS
+= $(call cc-option
,-Wdeclaration-after-statement
,)
861 # disable pointer signed / unsigned warnings in gcc 4.0
862 KBUILD_CFLAGS
+= $(call cc-disable-warning
, pointer-sign
)
864 # disable invalid "can't wrap" optimizations for signed / pointers
865 KBUILD_CFLAGS
+= $(call cc-option
,-fno-strict-overflow
)
867 # clang sets -fmerge-all-constants by default as optimization, but this
868 # is non-conforming behavior for C and in fact breaks the kernel, so we
869 # need to disable it here generally.
870 KBUILD_CFLAGS
+= $(call cc-option
,-fno-merge-all-constants
)
872 # for gcc -fno-merge-all-constants disables everything, but it is fine
873 # to have actual conforming behavior enabled.
874 KBUILD_CFLAGS
+= $(call cc-option
,-fmerge-constants
)
876 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
877 KBUILD_CFLAGS
+= $(call cc-option
,-fno-stack-check
,)
879 # conserve stack if available
880 KBUILD_CFLAGS
+= $(call cc-option
,-fconserve-stack
)
882 # disallow errors like 'EXPORT_GPL(foo);' with missing header
883 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=implicit-int
)
885 # require functions to have arguments in prototypes, not empty 'int foo()'
886 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=strict-prototypes
)
888 # Prohibit date/time macros, which would make the build non-deterministic
889 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=date-time
)
891 # enforce correct pointer usage
892 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=incompatible-pointer-types
)
894 # Require designated initializers for all marked structures
895 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=designated-init
)
897 # use the deterministic mode of AR if available
898 KBUILD_ARFLAGS
:= $(call ar-option
,D
)
900 include scripts
/Makefile.kasan
901 include scripts
/Makefile.extrawarn
902 include scripts
/Makefile.ubsan
904 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
906 KBUILD_CPPFLAGS
+= $(ARCH_CPPFLAGS
) $(KCPPFLAGS
)
907 KBUILD_AFLAGS
+= $(ARCH_AFLAGS
) $(KAFLAGS
)
908 KBUILD_CFLAGS
+= $(ARCH_CFLAGS
) $(KCFLAGS
)
910 # Use --build-id when available.
911 LDFLAGS_BUILD_ID
:= $(patsubst -Wl
$(comma
)%,%,\
912 $(call cc-ldoption
, -Wl
$(comma
)--build-id
,))
913 KBUILD_LDFLAGS_MODULE
+= $(LDFLAGS_BUILD_ID
)
914 LDFLAGS_vmlinux
+= $(LDFLAGS_BUILD_ID
)
916 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
917 LDFLAGS_vmlinux
+= $(call ld-option
, --gc-sections
,)
920 ifeq ($(CONFIG_STRIP_ASM_SYMS
),y
)
921 LDFLAGS_vmlinux
+= $(call ld-option
, -X
,)
924 # Default kernel image to build when no specific target is given.
925 # KBUILD_IMAGE may be overruled on the command line or
926 # set in the environment
927 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
929 export KBUILD_IMAGE ?
= vmlinux
932 # INSTALL_PATH specifies where to place the updated kernel and system map
933 # images. Default is /boot, but you can set it to other values
934 export INSTALL_PATH ?
= /boot
937 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
938 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
939 # an argument if needed. Otherwise it defaults to the kernel install path
941 export INSTALL_DTBS_PATH ?
= $(INSTALL_PATH
)/dtbs
/$(KERNELRELEASE
)
944 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
945 # relocations required by build roots. This is not defined in the
946 # makefile but the argument can be passed to make if needed.
949 MODLIB
= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
953 # INSTALL_MOD_STRIP, if defined, will cause modules to be
954 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
955 # the default option --strip-debug will be used. Otherwise,
956 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
958 ifdef INSTALL_MOD_STRIP
959 ifeq ($(INSTALL_MOD_STRIP
),1)
960 mod_strip_cmd
= $(STRIP
) --strip-debug
962 mod_strip_cmd
= $(STRIP
) $(INSTALL_MOD_STRIP
)
963 endif # INSTALL_MOD_STRIP=1
966 endif # INSTALL_MOD_STRIP
969 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
970 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
971 # or CONFIG_MODULE_COMPRESS_XZ.
973 mod_compress_cmd
= true
974 ifdef CONFIG_MODULE_COMPRESS
975 ifdef CONFIG_MODULE_COMPRESS_GZIP
976 mod_compress_cmd
= gzip
-n
-f
977 endif # CONFIG_MODULE_COMPRESS_GZIP
978 ifdef CONFIG_MODULE_COMPRESS_XZ
979 mod_compress_cmd
= xz
-f
980 endif # CONFIG_MODULE_COMPRESS_XZ
981 endif # CONFIG_MODULE_COMPRESS
982 export mod_compress_cmd
984 # Select initial ramdisk compression format, default is gzip(1).
985 # This shall be used by the dracut(8) tool while creating an initramfs image.
987 INITRD_COMPRESS-y
:= gzip
988 INITRD_COMPRESS-
$(CONFIG_RD_BZIP2
) := bzip2
989 INITRD_COMPRESS-
$(CONFIG_RD_LZMA
) := lzma
990 INITRD_COMPRESS-
$(CONFIG_RD_XZ
) := xz
991 INITRD_COMPRESS-
$(CONFIG_RD_LZO
) := lzo
992 INITRD_COMPRESS-
$(CONFIG_RD_LZ4
) := lz4
993 # do not export INITRD_COMPRESS, since we didn't actually
994 # choose a sane default compression above.
995 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
997 ifdef CONFIG_MODULE_SIG_ALL
998 $(eval
$(call config_filename
,MODULE_SIG_KEY
))
1000 mod_sign_cmd
= scripts
/sign-file
$(CONFIG_MODULE_SIG_HASH
) $(MODULE_SIG_KEY_SRCPREFIX
)$(CONFIG_MODULE_SIG_KEY
) certs
/signing_key.x509
1006 ifdef CONFIG_STACK_VALIDATION
1007 has_libelf
:= $(call try-run
,\
1008 echo
"int main() {}" |
$(HOSTCC
) -xc
-o
/dev
/null
-lelf
-,1,0)
1009 ifeq ($(has_libelf
),1)
1010 objtool_target
:= tools
/objtool FORCE
1012 ifdef CONFIG_UNWINDER_ORC
1013 $(error
"Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
1015 $(warning
"Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
1017 SKIP_STACK_VALIDATION
:= 1
1018 export SKIP_STACK_VALIDATION
1023 ifeq ($(KBUILD_EXTMOD
),)
1024 core-y
+= kernel
/ certs
/ mm
/ fs
/ ipc
/ security
/ crypto
/ block
/
1026 vmlinux-dirs
:= $(patsubst %/,%,$(filter %/, $(init-y
) $(init-m
) \
1027 $(core-y
) $(core-m
) $(drivers-y
) $(drivers-m
) \
1028 $(net-y
) $(net-m
) $(libs-y
) $(libs-m
) $(virt-y
)))
1030 vmlinux-alldirs
:= $(sort $(vmlinux-dirs
) $(patsubst %/,%,$(filter %/, \
1031 $(init-
) $(core-
) $(drivers-
) $(net-
) $(libs-
) $(virt-
))))
1033 init-y
:= $(patsubst %/, %/built-in.o
, $(init-y
))
1034 core-y
:= $(patsubst %/, %/built-in.o
, $(core-y
))
1035 drivers-y
:= $(patsubst %/, %/built-in.o
, $(drivers-y
))
1036 net-y
:= $(patsubst %/, %/built-in.o
, $(net-y
))
1037 libs-y1
:= $(patsubst %/, %/lib.a
, $(libs-y
))
1038 libs-y2
:= $(filter-out %.a
, $(patsubst %/, %/built-in.o
, $(libs-y
)))
1039 virt-y
:= $(patsubst %/, %/built-in.o
, $(virt-y
))
1041 # Externally visible symbols (used by link-vmlinux.sh)
1042 export KBUILD_VMLINUX_INIT
:= $(head-y
) $(init-y
)
1043 export KBUILD_VMLINUX_MAIN
:= $(core-y
) $(libs-y2
) $(drivers-y
) $(net-y
) $(virt-y
)
1044 export KBUILD_VMLINUX_LIBS
:= $(libs-y1
)
1045 export KBUILD_LDS
:= arch
/$(SRCARCH
)/kernel
/vmlinux.lds
1046 export LDFLAGS_vmlinux
1047 # used by scripts/package/Makefile
1048 export KBUILD_ALLDIRS
:= $(sort $(filter-out arch
/%,$(vmlinux-alldirs
)) arch Documentation
include samples scripts tools
)
1050 vmlinux-deps
:= $(KBUILD_LDS
) $(KBUILD_VMLINUX_INIT
) $(KBUILD_VMLINUX_MAIN
) $(KBUILD_VMLINUX_LIBS
)
1052 # Include targets which we want to execute sequentially if the rest of the
1053 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
1054 # evaluated more than once.
1055 PHONY
+= vmlinux_prereq
1056 vmlinux_prereq
: $(vmlinux-deps
) FORCE
1057 ifdef CONFIG_HEADERS_CHECK
1058 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile headers_check
1060 ifdef CONFIG_GDB_SCRIPTS
1061 $(Q
)ln
-fsn
$(abspath
$(srctree
)/scripts
/gdb
/vmlinux-gdb.py
)
1063 ifdef CONFIG_TRIM_UNUSED_KSYMS
1064 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/adjust_autoksyms.sh \
1065 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1068 # standalone target for easier testing
1069 include/generated
/autoksyms.h
: FORCE
1070 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/adjust_autoksyms.sh true
1072 ARCH_POSTLINK
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/Makefile.postlink
)
1074 # Final link of vmlinux with optional arch pass after final link
1075 cmd_link-vmlinux
= \
1076 $(CONFIG_SHELL
) $< $(LD
) $(LDFLAGS
) $(LDFLAGS_vmlinux
) ; \
1077 $(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) $@
, true
)
1079 vmlinux
: scripts
/link-vmlinux.sh vmlinux_prereq
$(vmlinux-deps
) FORCE
1080 +$(call if_changed
,link-vmlinux
)
1082 # Build samples along the rest of the kernel
1083 ifdef CONFIG_SAMPLES
1084 vmlinux-dirs
+= samples
1087 # The actual objects are generated when descending,
1088 # make sure no implicit rule kicks in
1089 $(sort $(vmlinux-deps
)): $(vmlinux-dirs
) ;
1091 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1092 # Preset locale variables to speed up the build process. Limit locale
1093 # tweaks to this spot to avoid wrong language settings when running
1094 # make menuconfig etc.
1095 # Error messages still appears in the original language
1097 PHONY
+= $(vmlinux-dirs
)
1098 $(vmlinux-dirs
): prepare scripts
1099 $(Q
)$(MAKE
) $(build
)=$@
1101 define filechk_kernel.release
1102 echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1105 # Store (new) KERNELRELEASE string in include/config/kernel.release
1106 include/config
/kernel.release
: include/config
/auto.conf FORCE
1107 $(call filechk
,kernel.release
)
1110 # Things we need to do before we recursively start building the kernel
1111 # or the modules are listed in "prepare".
1112 # A multi level approach is used. prepareN is processed before prepareN-1.
1113 # archprepare is used in arch Makefiles and when processed asm symlink,
1114 # version.h and scripts_basic is processed / created.
1116 # Listed in dependency order
1117 PHONY
+= prepare archprepare prepare0 prepare1 prepare2 prepare3
1119 # prepare3 is used to check if we are building in a separate output directory,
1121 # 1) Check that make has not been executed in the kernel src $(srctree)
1122 prepare3
: include/config
/kernel.release
1123 ifneq ($(KBUILD_SRC
),)
1124 @
$(kecho
) ' Using $(srctree) as source for kernel'
1125 $(Q
)if
[ -f
$(srctree
)/.config
-o
-d
$(srctree
)/include/config
]; then \
1126 echo
>&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1127 echo
>&2 " in the '$(srctree)' directory.";\
1132 # prepare2 creates a makefile if using a separate output directory.
1133 # From this point forward, .config has been reprocessed, so any rules
1134 # that need to depend on updated CONFIG_* values can be checked here.
1135 prepare2
: prepare3 prepare-compiler-check outputmakefile asm-generic
1137 prepare1
: prepare2
$(version_h
) include/generated
/utsrelease.h \
1138 include/config
/auto.conf
1141 archprepare
: archheaders archscripts prepare1 scripts_basic
1143 prepare0
: archprepare gcc-plugins
1144 $(Q
)$(MAKE
) $(build
)=.
1146 # All the preparing..
1147 prepare
: prepare0 prepare-objtool
1149 # Support for using generic headers in asm-generic
1150 PHONY
+= asm-generic uapi-asm-generic
1151 asm-generic
: uapi-asm-generic
1152 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.asm-generic \
1153 src
=asm obj
=arch
/$(SRCARCH
)/include/generated
/asm
1155 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.asm-generic \
1156 src
=uapi
/asm obj
=arch
/$(SRCARCH
)/include/generated
/uapi
/asm
1158 PHONY
+= prepare-objtool
1159 prepare-objtool
: $(objtool_target
)
1161 # Check for CONFIG flags that require compiler support. Abort the build
1162 # after .config has been processed, but before the kernel build starts.
1164 # For security-sensitive CONFIG options, we don't want to fallback and/or
1165 # silently change which compiler flags will be used, since that leads to
1166 # producing kernels with different security feature characteristics
1167 # depending on the compiler used. (For example, "But I selected
1168 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1169 PHONY
+= prepare-compiler-check
1170 prepare-compiler-check
: FORCE
1171 # Make sure we're using a supported toolchain with LTO_CLANG
1172 ifdef CONFIG_LTO_CLANG
1173 ifneq ($(call clang-ifversion
, -ge
, 0500, y
), y
)
1174 @echo Cannot use CONFIG_LTO_CLANG
: requires clang
5.0 or later
>&2 && exit
1
1176 ifneq ($(call gold-ifversion
, -ge
, 112000000, y
), y
)
1177 @echo Cannot use CONFIG_LTO_CLANG
: requires GNU gold
1.12 or later
>&2 && exit
1
1180 # Make sure compiler supports LTO flags
1182 ifeq ($(call cc-option
, $(lto-flags
)),)
1183 @echo Cannot use CONFIG_LTO
: $(lto-flags
) not supported by compiler \
1187 # Make sure compiler supports requested stack protector flag.
1189 ifeq ($(call cc-option
, $(stackp-flag
)),)
1190 @echo Cannot use CONFIG_CC_STACKPROTECTOR_
$(stackp-name
): \
1191 $(stackp-flag
) not supported by compiler
>&2 && exit
1
1194 # Make sure compiler does not have buggy stack-protector support.
1196 ifneq ($(shell $(CONFIG_SHELL
) $(stackp-check
) $(CC
) $(KBUILD_CPPFLAGS
) $(biarch
)),y
)
1197 @echo Cannot use CONFIG_CC_STACKPROTECTOR_
$(stackp-name
): \
1198 $(stackp-flag
) available but compiler is broken
>&2 && exit
1
1202 ifeq ($(call cc-option
, $(cfi-flags
)),)
1203 @echo Cannot use CONFIG_CFI
: $(cfi-flags
) not supported by compiler
>&2 && exit
1
1208 # Generate some files
1209 # ---------------------------------------------------------------------------
1211 # KERNELRELEASE can change from a few different places, meaning version.h
1212 # needs to be updated, so this check is forced on all builds
1215 define filechk_utsrelease.h
1216 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
1217 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1220 (echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1223 define filechk_version.h
1224 (echo \
#define LINUX_VERSION_CODE $(shell \
1225 expr
$(VERSION
) \
* 65536 + 0$(PATCHLEVEL
) \
* 256 + 0$(SUBLEVEL
)); \
1226 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1229 $(version_h
): $(srctree
)/Makefile FORCE
1230 $(call filechk
,version.h
)
1231 $(Q
)rm -f
$(old_version_h
)
1233 include/generated
/utsrelease.h
: include/config
/kernel.release FORCE
1234 $(call filechk
,utsrelease.h
)
1238 $(Q
)find
$(srctree
)/include/ -name
'*.h' | xargs
--max-args
1 \
1239 $(srctree
)/scripts
/headerdep.pl
-I
$(srctree
)/include
1241 # ---------------------------------------------------------------------------
1244 #Default location for installed headers
1245 export INSTALL_HDR_PATH
= $(objtree
)/usr
1247 # If we do an all arch process set dst to include/arch-$(hdr-arch)
1248 hdr-dst
= $(if
$(KBUILD_HEADERS
), dst
=include/arch-
$(hdr-arch
), dst
=include)
1250 PHONY
+= archheaders
1253 PHONY
+= archscripts
1257 __headers
: $(version_h
) scripts_basic uapi-asm-generic archheaders archscripts
1258 $(Q
)$(MAKE
) $(build
)=scripts build_unifdef
1260 PHONY
+= headers_install_all
1261 headers_install_all
:
1262 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
install
1264 PHONY
+= headers_install
1265 headers_install
: __headers
1266 $(if
$(wildcard $(srctree
)/arch
/$(hdr-arch
)/include/uapi
/asm
/Kbuild
),, \
1267 $(error Headers not exportable for the
$(SRCARCH
) architecture
))
1268 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi dst
=include
1269 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(hdr-arch
)/include/uapi
$(hdr-dst
)
1271 PHONY
+= headers_check_all
1272 headers_check_all
: headers_install_all
1273 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
check
1275 PHONY
+= headers_check
1276 headers_check
: headers_install
1277 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi dst
=include HDRCHECK
=1
1278 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(hdr-arch
)/include/uapi
$(hdr-dst
) HDRCHECK
=1
1280 # ---------------------------------------------------------------------------
1285 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests run_tests
1287 PHONY
+= kselftest-clean
1289 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests
clean
1291 PHONY
+= kselftest-merge
1293 $(if
$(wildcard $(objtree
)/.config
),, $(error No .config exists
, config your kernel first
!))
1294 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/kconfig
/merge_config.sh \
1295 -m
$(objtree
)/.config \
1296 $(srctree
)/tools
/testing
/selftests
/*/config
1297 +$(Q
)$(MAKE
) -f
$(srctree
)/Makefile olddefconfig
1299 # ---------------------------------------------------------------------------
1302 ifdef CONFIG_MODULES
1304 # By default, build modules as well
1310 # A module can be listed more than once in obj-m resulting in
1311 # duplicate lines in modules.order files. Those are removed
1312 # using awk while concatenating to the final file.
1315 modules
: $(vmlinux-dirs
) $(if
$(KBUILD_BUILTIN
),vmlinux
) modules.builtin
1316 $(Q
)$(AWK
) '!x[$$0]++' $(vmlinux-dirs
:%=$(objtree
)/%/modules.order
) > $(objtree
)/modules.order
1317 @
$(kecho
) ' Building modules, stage 2.';
1318 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1320 modules.builtin
: $(vmlinux-dirs
:%=%/modules.builtin
)
1321 $(Q
)$(AWK
) '!x[$$0]++' $^
> $(objtree
)/modules.builtin
1323 %/modules.builtin
: include/config
/auto.conf
1324 $(Q
)$(MAKE
) $(modbuiltin
)=$*
1327 # Target to prepare building external modules
1328 PHONY
+= modules_prepare
1329 modules_prepare
: prepare scripts
1331 # Target to install modules
1332 PHONY
+= modules_install
1333 modules_install
: _modinst_ _modinst_post
1337 @
rm -rf
$(MODLIB
)/kernel
1338 @
rm -f
$(MODLIB
)/source
1339 @mkdir
-p
$(MODLIB
)/kernel
1340 @ln
-s
$(abspath
$(srctree
)) $(MODLIB
)/source
1341 @if
[ ! $(objtree
) -ef
$(MODLIB
)/build
]; then \
1342 rm -f
$(MODLIB
)/build
; \
1343 ln
-s
$(CURDIR
) $(MODLIB
)/build
; \
1345 @cp
-f
$(objtree
)/modules.order
$(MODLIB
)/
1346 @cp
-f
$(objtree
)/modules.builtin
$(MODLIB
)/
1347 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1349 # This depmod is only for convenience to give the initial
1350 # boot a modules.dep even before / is mounted read-write. However the
1351 # boot script depmod is the master version.
1352 PHONY
+= _modinst_post
1353 _modinst_post
: _modinst_
1356 ifeq ($(CONFIG_MODULE_SIG
), y
)
1357 PHONY
+= modules_sign
1359 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modsign
1362 else # CONFIG_MODULES
1364 # Modules not configured
1365 # ---------------------------------------------------------------------------
1367 PHONY
+= modules modules_install
1368 modules modules_install
:
1370 @echo
>&2 "The present kernel configuration has modules disabled."
1371 @echo
>&2 "Type 'make config' and enable loadable module support."
1372 @echo
>&2 "Then build a kernel with module support enabled."
1376 endif # CONFIG_MODULES
1379 # Cleaning is done on three levels.
1380 # make clean Delete most generated files
1381 # Leave enough to build external modules
1382 # make mrproper Delete the current configuration, and all generated files
1383 # make distclean Remove editor backup files, patch leftover files and the like
1385 # Directories & files removed with 'make clean'
1386 CLEAN_DIRS
+= $(MODVERDIR
)
1388 # Directories & files removed with 'make mrproper'
1389 MRPROPER_DIRS
+= include/config usr
/include include/generated \
1390 arch
/*/include/generated .tmp_objdiff
1391 MRPROPER_FILES
+= .config .config.old .version .old_version \
1392 Module.symvers
tags TAGS cscope
* GPATH GTAGS GRTAGS GSYMS \
1393 signing_key.pem signing_key.priv signing_key.x509 \
1394 x509.genkey extra_certificates signing_key.x509.keyid \
1395 signing_key.x509.signer vmlinux-gdb.py
1397 # clean - Delete most, but leave enough to build external modules
1399 clean: rm-dirs
:= $(CLEAN_DIRS
)
1400 clean: rm-files
:= $(CLEAN_FILES
)
1401 clean-dirs
:= $(addprefix _clean_
, .
$(vmlinux-alldirs
) Documentation samples
)
1403 PHONY
+= $(clean-dirs
) clean archclean vmlinuxclean
1405 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1408 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/link-vmlinux.sh
clean
1409 $(Q
)$(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) clean)
1411 clean: archclean vmlinuxclean
1413 # mrproper - Delete all generated files, including .config
1415 mrproper
: rm-dirs
:= $(wildcard $(MRPROPER_DIRS
))
1416 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
1417 mrproper-dirs
:= $(addprefix _mrproper_
,scripts
)
1419 PHONY
+= $(mrproper-dirs
) mrproper archmrproper
1421 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
1423 mrproper
: clean archmrproper
$(mrproper-dirs
)
1432 @find
$(srctree
) $(RCS_FIND_IGNORE
) \
1433 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
1434 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'*%' \
1435 -o
-name
'core' \
) \
1436 -type f
-print | xargs
rm -f
1439 # Packaging of the kernel to various formats
1440 # ---------------------------------------------------------------------------
1441 # rpm target kept for backward compatibility
1442 package-dir
:= scripts
/package
1445 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1446 %pkg
: include/config
/kernel.release FORCE
1447 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1448 rpm
: include/config
/kernel.release FORCE
1449 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1452 # Brief documentation of the typical targets used
1453 # ---------------------------------------------------------------------------
1455 boards
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*_defconfig
)
1456 boards
:= $(sort $(notdir $(boards
)))
1457 board-dirs
:= $(dir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*/*_defconfig
))
1458 board-dirs
:= $(sort $(notdir $(board-dirs
:/=)))
1462 @echo
'Cleaning targets:'
1463 @echo
' clean - Remove most generated files but keep the config and'
1464 @echo
' enough build support to build external modules'
1465 @echo
' mrproper - Remove all generated files + config + various backup files'
1466 @echo
' distclean - mrproper + remove editor backup and patch files'
1468 @echo
'Configuration targets:'
1469 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
1471 @echo
'Other generic targets:'
1472 @echo
' all - Build all targets marked with [*]'
1473 @echo
'* vmlinux - Build the bare kernel'
1474 @echo
'* modules - Build all modules'
1475 @echo
' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1476 @echo
' dir/ - Build all files in dir and below'
1477 @echo
' dir/file.[ois] - Build specified target only'
1478 @echo
' dir/file.ll - Build the LLVM assembly file'
1479 @echo
' (requires compiler support for LLVM assembly generation)'
1480 @echo
' dir/file.lst - Build specified mixed source/assembly target only'
1481 @echo
' (requires a recent binutils and recent build (System.map))'
1482 @echo
' dir/file.ko - Build module including final link'
1483 @echo
' modules_prepare - Set up for building external modules'
1484 @echo
' tags/TAGS - Generate tags file for editors'
1485 @echo
' cscope - Generate cscope index'
1486 @echo
' gtags - Generate GNU GLOBAL index'
1487 @echo
' kernelrelease - Output the release version string (use with make -s)'
1488 @echo
' kernelversion - Output the version stored in Makefile (use with make -s)'
1489 @echo
' image_name - Output the image name (use with make -s)'
1490 @echo
' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1491 echo
' (default: $(INSTALL_HDR_PATH))'; \
1493 @echo
'Static analysers:'
1494 @echo
' checkstack - Generate a list of stack hogs'
1495 @echo
' namespacecheck - Name space analysis on compiled kernel'
1496 @echo
' versioncheck - Sanity check on version.h usage'
1497 @echo
' includecheck - Check for duplicate included header files'
1498 @echo
' export_report - List the usages of all exported symbols'
1499 @echo
' headers_check - Sanity check on exported headers'
1500 @echo
' headerdep - Detect inclusion cycles in headers'
1501 @
$(MAKE
) -f
$(srctree
)/scripts
/Makefile.help checker-help
1503 @echo
'Kernel selftest:'
1504 @echo
' kselftest - Build and run kernel selftest (run as root)'
1505 @echo
' Build, install, and boot kernel before'
1506 @echo
' running kselftest on it'
1507 @echo
' kselftest-clean - Remove all generated kselftest files'
1508 @echo
' kselftest-merge - Merge all the config dependencies of kselftest to existing'
1511 @echo
'Userspace tools targets:'
1512 @echo
' use "make tools/help"'
1513 @echo
' or "cd tools; make help"'
1515 @echo
'Kernel packaging:'
1516 @
$(MAKE
) $(build
)=$(package-dir
) help
1518 @echo
'Documentation targets:'
1519 @
$(MAKE
) -f
$(srctree
)/Documentation
/Makefile dochelp
1521 @echo
'Architecture specific targets ($(SRCARCH)):'
1522 @
$(if
$(archhelp
),$(archhelp
),\
1523 echo
' No architecture specific help defined for $(SRCARCH)')
1526 $(foreach b
, $(boards
), \
1527 printf
" %-24s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
1529 @
$(if
$(board-dirs
), \
1530 $(foreach b
, $(board-dirs
), \
1531 printf
" %-16s - Show %s-specific targets\\n" help-
$(b
) $(b
);) \
1532 printf
" %-16s - Show all of the above\\n" help-boards
; \
1535 @echo
' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1536 @echo
' make V=2 [targets] 2 => give reason for rebuild of target'
1537 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
1538 @echo
' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1539 @echo
' make C=2 [targets] Force check of all c source with $$CHECK'
1540 @echo
' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1541 @echo
' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1542 @echo
' 1: warnings which may be relevant and do not occur too often'
1543 @echo
' 2: warnings which occur quite often but may still be relevant'
1544 @echo
' 3: more obscure warnings, can most likely be ignored'
1545 @echo
' Multiple levels can be combined with W=12 or W=123'
1547 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
1548 @echo
'For further info see the ./README file'
1551 help-board-dirs
:= $(addprefix help-
,$(board-dirs
))
1553 help-boards
: $(help-board-dirs
)
1555 boards-per-dir
= $(sort $(notdir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/$*/*_defconfig
)))
1557 $(help-board-dirs
): help-
%:
1558 @echo
'Architecture specific targets ($(SRCARCH) $*):'
1559 @
$(if
$(boards-per-dir
), \
1560 $(foreach b
, $(boards-per-dir
), \
1561 printf
" %-24s - Build for %s\\n" $*/$(b
) $(subst _defconfig
,,$(b
));) \
1565 # Documentation targets
1566 # ---------------------------------------------------------------------------
1567 DOC_TARGETS
:= xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs linkcheckdocs
1568 PHONY
+= $(DOC_TARGETS
)
1569 $(DOC_TARGETS
): scripts_basic FORCE
1570 $(Q
)$(MAKE
) $(build
)=Documentation
$@
1572 else # KBUILD_EXTMOD
1575 # External module support.
1576 # When building external modules the kernel used as basis is considered
1577 # read-only, and no consistency checks are made and the make
1578 # system is not used on the basis kernel. If updates are required
1579 # in the basis kernel ordinary make commands (without M=...) must
1582 # The following are the only valid targets when building external
1584 # make M=dir clean Delete all automatically generated files
1585 # make M=dir modules Make all modules in specified dir
1586 # make M=dir Same as 'make M=dir modules'
1587 # make M=dir modules_install
1588 # Install the modules built in the module directory
1589 # Assumes install directory is already created
1591 # We are always building modules
1593 PHONY
+= crmodverdir
1597 PHONY
+= $(objtree
)/Module.symvers
1598 $(objtree
)/Module.symvers
:
1599 @
test -e
$(objtree
)/Module.symvers ||
( \
1601 echo
" WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1602 echo
" is missing; modules will have no dependencies and modversions."; \
1605 module-dirs
:= $(addprefix _module_
,$(KBUILD_EXTMOD
))
1606 PHONY
+= $(module-dirs
) modules
1607 $(module-dirs
): crmodverdir
$(objtree
)/Module.symvers
1608 $(Q
)$(MAKE
) $(build
)=$(patsubst _module_
%,%,$@
)
1610 modules
: $(module-dirs
)
1611 @
$(kecho
) ' Building modules, stage 2.';
1612 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1614 PHONY
+= modules_install
1615 modules_install
: _emodinst_ _emodinst_post
1617 install-dir
:= $(if
$(INSTALL_MOD_DIR
),$(INSTALL_MOD_DIR
),extra
)
1620 $(Q
)mkdir
-p
$(MODLIB
)/$(install-dir
)
1621 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1623 PHONY
+= _emodinst_post
1624 _emodinst_post
: _emodinst_
1627 clean-dirs
:= $(addprefix _clean_
,$(KBUILD_EXTMOD
))
1629 PHONY
+= $(clean-dirs
) clean
1631 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1633 clean: rm-dirs
:= $(MODVERDIR
)
1634 clean: rm-files
:= $(KBUILD_EXTMOD
)/Module.symvers
1638 @echo
' Building external modules.'
1639 @echo
' Syntax: make -C path/to/kernel/src M=$$PWD target'
1641 @echo
' modules - default target, build the module(s)'
1642 @echo
' modules_install - install the module'
1643 @echo
' clean - remove generated files in module directory only'
1647 PHONY
+= prepare scripts
1650 endif # KBUILD_EXTMOD
1652 clean: $(clean-dirs
)
1655 @find
$(if
$(KBUILD_EXTMOD
), $(KBUILD_EXTMOD
), .
) $(RCS_FIND_IGNORE
) \
1656 \
( -name
'*.[oas]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
1660 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
1661 -o
-name
'*.symtypes' -o
-name
'modules.order' \
1662 -o
-name modules.builtin
-o
-name
'.tmp_*.o.*' \
1663 -o
-name
'*.c.[012]*.*' \
1666 -o
-name
'*.*.symversions' \
) -type f
-print | xargs
rm -f
1668 # Generate tags for editors
1669 # ---------------------------------------------------------------------------
1670 quiet_cmd_tags
= GEN
$@
1671 cmd_tags
= $(CONFIG_SHELL
) $(srctree
)/scripts
/tags.sh
$@
1673 tags TAGS cscope gtags
: FORCE
1676 # Scripts to check various things for consistency
1677 # ---------------------------------------------------------------------------
1679 PHONY
+= includecheck versioncheck coccicheck namespacecheck export_report
1682 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1683 -name
'*.[hcS]' -type f
-print |
sort \
1684 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkincludes.pl
1687 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1688 -name
'*.[hcS]' -type f
-print |
sort \
1689 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkversion.pl
1692 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/$@
1695 $(PERL
) $(srctree
)/scripts
/namespace.pl
1698 $(PERL
) $(srctree
)/scripts
/export_report.pl
1700 endif #ifeq ($(config-targets),1)
1701 endif #ifeq ($(mixed-targets),1)
1703 PHONY
+= checkstack kernelrelease kernelversion image_name
1705 # UML needs a little special treatment here. It wants to use the host
1706 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1707 # else wants $(ARCH), including people doing cross-builds, which means
1708 # that $(SUBARCH) doesn't work here.
1710 CHECKSTACK_ARCH
:= $(SUBARCH
)
1712 CHECKSTACK_ARCH
:= $(ARCH
)
1715 $(OBJDUMP
) -d vmlinux
$$(find .
-name
'*.ko') | \
1716 $(PERL
) $(src
)/scripts
/checkstack.pl
$(CHECKSTACK_ARCH
)
1719 @echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1722 @echo
$(KERNELVERSION
)
1725 @echo
$(KBUILD_IMAGE
)
1727 # Clear a bunch of variables before executing the submake
1729 $(Q
)mkdir
-p
$(objtree
)/tools
1730 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(src
)/tools
/
1733 $(Q
)mkdir
-p
$(objtree
)/tools
1734 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(src
)/tools
/ $*
1737 # ---------------------------------------------------------------------------
1738 # Single targets are compatible with:
1739 # - build with mixed source and output
1740 # - build with separate output dir 'make O=...'
1741 # - external modules
1743 # target-dir => where to store outputfile
1744 # build-dir => directory in kernel source tree to use
1746 ifeq ($(KBUILD_EXTMOD
),)
1747 build-dir
= $(patsubst %/,%,$(dir $@
))
1748 target-dir
= $(dir $@
)
1750 zap-slash
=$(filter-out .
,$(patsubst %/,%,$(dir $@
)))
1751 build-dir
= $(KBUILD_EXTMOD
)$(if
$(zap-slash
),/$(zap-slash
))
1752 target-dir
= $(if
$(KBUILD_EXTMOD
),$(dir $<),$(dir $@
))
1755 %.s
: %.c prepare scripts FORCE
1756 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1757 %.i
: %.c prepare scripts FORCE
1758 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1759 %.o
: %.c prepare scripts FORCE
1760 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1761 %.lst
: %.c prepare scripts FORCE
1762 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1763 %.s
: %.S prepare scripts FORCE
1764 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1765 %.o
: %.S prepare scripts FORCE
1766 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1767 %.symtypes
: %.c prepare scripts FORCE
1768 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1769 %.ll
: %.c prepare scripts FORCE
1770 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1773 /: prepare scripts FORCE
1775 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1776 $(build
)=$(build-dir
)
1777 # Make sure the latest headers are built for Documentation
1778 Documentation
/ samples
/: headers_install
1779 %/: prepare scripts FORCE
1781 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1782 $(build
)=$(build-dir
)
1783 %.ko
: prepare scripts FORCE
1785 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1786 $(build
)=$(build-dir
) $(@
:.ko
=.o
)
1787 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1789 # FIXME Should go into a make.lib or something
1790 # ===========================================================================
1792 quiet_cmd_rmdirs
= $(if
$(wildcard $(rm-dirs
)),CLEAN
$(wildcard $(rm-dirs
)))
1793 cmd_rmdirs
= rm -rf
$(rm-dirs
)
1795 quiet_cmd_rmfiles
= $(if
$(wildcard $(rm-files
)),CLEAN
$(wildcard $(rm-files
)))
1796 cmd_rmfiles
= rm -f
$(rm-files
)
1798 # Run depmod only if we have System.map and depmod is executable
1799 quiet_cmd_depmod
= DEPMOD
$(KERNELRELEASE
)
1800 cmd_depmod
= $(CONFIG_SHELL
) $(srctree
)/scripts
/depmod.sh
$(DEPMOD
) \
1801 $(KERNELRELEASE
) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1803 # Create temporary dir for module support files
1804 # clean it up only when building all modules
1805 cmd_crmodverdir
= $(Q
)mkdir
-p
$(MODVERDIR
) \
1806 $(if
$(KBUILD_MODULES
),; rm -f
$(MODVERDIR
)/*)
1808 # read all saved command lines
1810 targets
:= $(wildcard $(sort $(targets
)))
1811 cmd_files
:= $(wildcard .
*.cmd
$(foreach f
,$(targets
),$(dir $(f
)).
$(notdir $(f
)).cmd
))
1813 ifneq ($(cmd_files
),)
1814 $(cmd_files
): ; # Do not try to update included dependency files
1815 include $(cmd_files
)
1818 endif # skip-makefile
1823 # Declare the contents of the .PHONY variable as phony. We keep that
1824 # information in a variable so we can use it in if_changed and friends.