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
2>/dev
/null
)
361 HOST_LFS_LDFLAGS
:= $(shell getconf LFS_LDFLAGS
2>/dev
/null
)
362 HOST_LFS_LIBS
:= $(shell getconf LFS_LIBS
2>/dev
/null
)
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_FLAGS
:= --target
=$(notdir $(CLANG_TRIPLE
:%-=%))
485 GCC_TOOLCHAIN_DIR
:= $(dir $(shell which
$(CROSS_COMPILE
)elfedit
))
486 CLANG_FLAGS
+= --prefix=$(GCC_TOOLCHAIN_DIR
)
487 GCC_TOOLCHAIN
:= $(realpath
$(GCC_TOOLCHAIN_DIR
)/..
)
489 ifneq ($(GCC_TOOLCHAIN
),)
490 CLANG_FLAGS
+= --gcc-toolchain
=$(GCC_TOOLCHAIN
)
492 CLANG_FLAGS
+= -no-integrated-as
493 KBUILD_CFLAGS
+= $(CLANG_FLAGS
)
494 KBUILD_AFLAGS
+= $(CLANG_FLAGS
)
498 RETPOLINE_CFLAGS_GCC
:= -mindirect-branch
=thunk-extern
-mindirect-branch-register
499 RETPOLINE_VDSO_CFLAGS_GCC
:= -mindirect-branch
=thunk-inline
-mindirect-branch-register
500 RETPOLINE_CFLAGS_CLANG
:= -mretpoline-external-thunk
501 RETPOLINE_VDSO_CFLAGS_CLANG
:= -mretpoline
502 RETPOLINE_CFLAGS
:= $(call cc-option
,$(RETPOLINE_CFLAGS_GCC
),$(call cc-option
,$(RETPOLINE_CFLAGS_CLANG
)))
503 RETPOLINE_VDSO_CFLAGS
:= $(call cc-option
,$(RETPOLINE_VDSO_CFLAGS_GCC
),$(call cc-option
,$(RETPOLINE_VDSO_CFLAGS_CLANG
)))
504 export RETPOLINE_CFLAGS
505 export RETPOLINE_VDSO_CFLAGS
507 ifeq ($(config-targets
),1)
508 # ===========================================================================
509 # *config targets only - make sure prerequisites are updated, and descend
510 # in scripts/kconfig to make the *config target
512 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
513 # KBUILD_DEFCONFIG may point out an alternative default configuration
514 # used for 'make defconfig'
515 include arch
/$(SRCARCH
)/Makefile
516 export KBUILD_DEFCONFIG KBUILD_KCONFIG
518 config
: scripts_basic outputmakefile FORCE
519 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
521 %config
: scripts_basic outputmakefile FORCE
522 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
525 # ===========================================================================
526 # Build targets only - this includes vmlinux, arch specific targets, clean
527 # targets and others. In general all targets except *config targets.
529 # If building an external module we do not care about the all: rule
530 # but instead _all depend on modules
532 ifeq ($(KBUILD_EXTMOD
),)
538 # Decide whether to build built-in, modular, or both.
539 # Normally, just do built-in.
544 # If we have only "make modules", don't compile built-in objects.
545 # When we're building modules with modversions, we need to consider
546 # the built-in objects during the descend as well, in order to
547 # make sure the checksums are up to date before we record them.
549 ifeq ($(MAKECMDGOALS
),modules
)
550 KBUILD_BUILTIN
:= $(if
$(CONFIG_MODVERSIONS
),1)
553 # If we have "make <whatever> modules", compile modules
554 # in addition to whatever we do anyway.
555 # Just "make" or "make all" shall build modules as well
557 ifneq ($(filter all _all modules
,$(MAKECMDGOALS
)),)
561 ifeq ($(MAKECMDGOALS
),)
565 export KBUILD_MODULES KBUILD_BUILTIN
567 ifeq ($(KBUILD_EXTMOD
),)
568 # Additional helpers built in scripts/
569 # Carefully list dependencies so we do not try to build scripts twice
572 scripts
: scripts_basic
include/config
/auto.conf
include/config
/tristate.conf \
573 asm-generic gcc-plugins
574 $(Q
)$(MAKE
) $(build
)=$(@
)
576 # Objects we will link into vmlinux / subdirs we need to visit
578 drivers-y
:= drivers
/ sound
/ firmware
/
583 endif # KBUILD_EXTMOD
585 ifeq ($(dot-config
),1)
587 -include include/config
/auto.conf
589 ifeq ($(KBUILD_EXTMOD
),)
590 # Read in dependencies to all Kconfig* files, make sure to run
591 # oldconfig if changes are detected.
592 -include include/config
/auto.conf.cmd
594 # To avoid any implicit rule to kick in, define an empty command
595 $(KCONFIG_CONFIG
) include/config
/auto.conf.cmd
: ;
597 # If .config is newer than include/config/auto.conf, someone tinkered
598 # with it and forgot to run make oldconfig.
599 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
600 # we execute the config step to be sure to catch updated Kconfig files
601 include/config
/%.conf
: $(KCONFIG_CONFIG
) include/config
/auto.conf.cmd
602 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile silentoldconfig
604 # external modules needs include/generated/autoconf.h and include/config/auto.conf
605 # but do not care if they are up-to-date. Use auto.conf to trigger the test
606 PHONY
+= include/config
/auto.conf
608 include/config
/auto.conf
:
609 $(Q
)test -e
include/generated
/autoconf.h
-a
-e
$@ ||
( \
611 echo
>&2 " ERROR: Kernel configuration is invalid."; \
612 echo
>&2 " include/generated/autoconf.h or $@ are missing.";\
613 echo
>&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
617 endif # KBUILD_EXTMOD
620 # Dummy target needed, because used as prerequisite
621 include/config
/auto.conf
: ;
622 endif # $(dot-config)
624 # For the kernel to actually contain only the needed exported symbols,
625 # we have to build modules as well to determine what those symbols are.
626 # (this can be evaluated only once include/config/auto.conf has been included)
627 ifdef CONFIG_TRIM_UNUSED_KSYMS
631 # The all: target is the default when no target is given on the
633 # This allow a user to issue only 'make' to build a kernel including modules
634 # Defaults to vmlinux, but the arch makefile usually adds further targets
637 KBUILD_CFLAGS
+= $(call cc-option
,-fno-PIE
)
638 KBUILD_AFLAGS
+= $(call cc-option
,-fno-PIE
)
639 CFLAGS_GCOV
:= -fprofile-arcs
-ftest-coverage
-fno-tree-loop-im
$(call cc-disable-warning
,maybe-uninitialized
,)
640 CFLAGS_KCOV
:= $(call cc-option
,-fsanitize-coverage
=trace-pc
,)
641 export CFLAGS_GCOV CFLAGS_KCOV
643 # Make toolchain changes before including arch/$(SRCARCH)/Makefile to ensure
644 # ar/cc/ld-* macros return correct values.
645 ifdef CONFIG_LTO_CLANG
646 # use GNU gold with LLVMgold for LTO linking, and LD for vmlinux_link
647 LDFINAL_vmlinux
:= $(LD
)
649 LDFLAGS
+= -plugin LLVMgold.so
650 # use llvm-ar for building symbol tables from IR files, and llvm-dis instead
651 # of objdump for processing symbol versions and exports
654 export LLVM_AR LLVM_DIS
657 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
658 # values of the respective KBUILD_* variables
662 include arch
/$(SRCARCH
)/Makefile
664 KBUILD_CFLAGS
+= $(call cc-option
,-fno-delete-null-pointer-checks
,)
665 KBUILD_CFLAGS
+= $(call cc-disable-warning
,frame-address
,)
666 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-truncation
)
667 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-overflow
)
668 KBUILD_CFLAGS
+= $(call cc-disable-warning
, int-in-bool-context
)
669 KBUILD_CFLAGS
+= $(call cc-disable-warning
, attribute-alias
)
671 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
672 KBUILD_CFLAGS
+= $(call cc-option
,-Oz
,-Os
)
673 KBUILD_CFLAGS
+= $(call cc-disable-warning
,maybe-uninitialized
,)
675 ifdef CONFIG_PROFILE_ALL_BRANCHES
676 KBUILD_CFLAGS
+= -O2
$(call cc-disable-warning
,maybe-uninitialized
,)
682 KBUILD_CFLAGS
+= $(call cc-ifversion
, -lt
, 0409, \
683 $(call cc-disable-warning
,maybe-uninitialized
,))
685 # Tell gcc to never replace conditional load with a non-conditional one
686 KBUILD_CFLAGS
+= $(call cc-option
,--param
=allow-store-data-races
=0)
688 # check for 'asm goto'
689 ifeq ($(shell $(CONFIG_SHELL
) $(srctree
)/scripts
/gcc-goto.sh
$(CC
) $(KBUILD_CFLAGS
)), y
)
690 KBUILD_CFLAGS
+= -DCC_HAVE_ASM_GOTO
691 KBUILD_AFLAGS
+= -DCC_HAVE_ASM_GOTO
694 include scripts
/Makefile.gcc-plugins
696 ifdef CONFIG_READABLE_ASM
697 # Disable optimizations that make assembler listings hard to read.
698 # reorder blocks reorders the control in the function
699 # ipa clone creates specialized cloned functions
700 # partial inlining inlines only parts of functions
701 KBUILD_CFLAGS
+= $(call cc-option
,-fno-reorder-blocks
,) \
702 $(call cc-option
,-fno-ipa-cp-clone
,) \
703 $(call cc-option
,-fno-partial-inlining
)
706 ifneq ($(CONFIG_FRAME_WARN
),0)
707 KBUILD_CFLAGS
+= $(call cc-option
,-Wframe-larger-than
=${CONFIG_FRAME_WARN})
710 # This selects the stack protector compiler flag. Testing it is delayed
711 # until after .config has been reprocessed, in the prepare-compiler-check
713 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
714 stackp-flag
:= -fstack-protector
715 stackp-name
:= REGULAR
717 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
718 stackp-flag
:= -fstack-protector-strong
719 stackp-name
:= STRONG
721 # Force off for distro compilers that enable stack protector by default.
722 stackp-flag
:= $(call cc-option
, -fno-stack-protector
)
725 # Find arch-specific stack protector compiler sanity-checking script.
726 ifdef CONFIG_CC_STACKPROTECTOR
727 stackp-path
:= $(srctree
)/scripts
/gcc-
$(SRCARCH
)_
$(BITS
)-has-stack-protector.sh
728 stackp-check
:= $(wildcard $(stackp-path
))
730 KBUILD_CFLAGS
+= $(stackp-flag
)
732 ifeq ($(cc-name
),clang
)
733 KBUILD_CPPFLAGS
+= $(call cc-option
,-Qunused-arguments
,)
734 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-invalid-specifier
)
735 KBUILD_CFLAGS
+= $(call cc-disable-warning
, gnu
)
736 KBUILD_CFLAGS
+= $(call cc-disable-warning
, address-of-packed-member
)
737 KBUILD_CFLAGS
+= $(call cc-disable-warning
, duplicate-decl-specifier
)
738 # Quiet clang warning: comparison of unsigned expression < 0 is always false
739 KBUILD_CFLAGS
+= $(call cc-disable-warning
, tautological-compare
)
740 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
741 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
742 # See modpost pattern 2
743 KBUILD_CFLAGS
+= $(call cc-option
, -mno-global-merge
,)
744 KBUILD_CFLAGS
+= $(call cc-option
, -fcatch-undefined-behavior
)
747 # These warnings generated too much noise in a regular build.
748 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
749 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-but-set-variable
)
752 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-const-variable
)
753 ifdef CONFIG_FRAME_POINTER
754 KBUILD_CFLAGS
+= -fno-omit-frame-pointer
-fno-optimize-sibling-calls
756 # Some targets (ARM with Thumb2, for example), can't be built with frame
757 # pointers. For those, we don't have FUNCTION_TRACER automatically
758 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
759 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
760 # -fomit-frame-pointer with FUNCTION_TRACER.
761 ifndef CONFIG_FUNCTION_TRACER
762 KBUILD_CFLAGS
+= -fomit-frame-pointer
766 KBUILD_CFLAGS
+= $(call cc-option
, -fno-var-tracking-assignments
)
768 ifdef CONFIG_DEBUG_INFO
769 ifdef CONFIG_DEBUG_INFO_SPLIT
770 KBUILD_CFLAGS
+= $(call cc-option
, -gsplit-dwarf
, -g
)
774 KBUILD_AFLAGS
+= -Wa
,-gdwarf-2
776 ifdef CONFIG_DEBUG_INFO_DWARF4
777 KBUILD_CFLAGS
+= $(call cc-option
, -gdwarf-4
,)
780 ifdef CONFIG_DEBUG_INFO_REDUCED
781 KBUILD_CFLAGS
+= $(call cc-option
, -femit-struct-debug-baseonly
) \
782 $(call cc-option
,-fno-var-tracking
)
785 ifdef CONFIG_FUNCTION_TRACER
786 ifndef CC_FLAGS_FTRACE
787 CC_FLAGS_FTRACE
:= -pg
789 export CC_FLAGS_FTRACE
790 ifdef CONFIG_HAVE_FENTRY
791 CC_USING_FENTRY
:= $(call cc-option
, -mfentry
-DCC_USING_FENTRY
)
793 KBUILD_CFLAGS
+= $(CC_FLAGS_FTRACE
) $(CC_USING_FENTRY
)
794 KBUILD_AFLAGS
+= $(CC_USING_FENTRY
)
795 ifdef CONFIG_DYNAMIC_FTRACE
796 ifdef CONFIG_HAVE_C_RECORDMCOUNT
797 BUILD_C_RECORDMCOUNT
:= y
798 export BUILD_C_RECORDMCOUNT
803 # We trigger additional mismatches with less inlining
804 ifdef CONFIG_DEBUG_SECTION_MISMATCH
805 KBUILD_CFLAGS
+= $(call cc-option
, -fno-inline-functions-called-once
)
808 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
809 KBUILD_CFLAGS
+= $(call cc-option
,-ffunction-sections
,)
810 KBUILD_CFLAGS
+= $(call cc-option
,-fdata-sections
,)
813 ifdef CONFIG_LTO_CLANG
814 lto-clang-flags
:= -flto
-fvisibility
=hidden
816 # allow disabling only clang LTO where needed
817 DISABLE_LTO_CLANG
:= -fno-lto
-fvisibility
=default
818 export DISABLE_LTO_CLANG
822 lto-flags
:= $(lto-clang-flags
)
823 KBUILD_CFLAGS
+= $(lto-flags
)
825 DISABLE_LTO
:= $(DISABLE_LTO_CLANG
)
828 # LDFINAL_vmlinux and LDFLAGS_FINAL_vmlinux can be set to override
829 # the linker and flags for vmlinux_link.
830 export LDFINAL_vmlinux LDFLAGS_FINAL_vmlinux
833 ifdef CONFIG_CFI_CLANG
834 cfi-clang-flags
+= -fsanitize
=cfi
835 DISABLE_CFI_CLANG
:= -fno-sanitize
=cfi
837 cfi-clang-flags
+= -fsanitize-cfi-cross-dso
838 DISABLE_CFI_CLANG
+= -fno-sanitize-cfi-cross-dso
840 ifdef CONFIG_CFI_PERMISSIVE
841 cfi-clang-flags
+= -fsanitize-recover
=cfi
-fno-sanitize-trap
=cfi
844 # also disable CFI when LTO is disabled
845 DISABLE_LTO_CLANG
+= $(DISABLE_CFI_CLANG
)
846 # allow disabling only clang CFI where needed
847 export DISABLE_CFI_CLANG
851 # cfi-flags are re-tested in prepare-compiler-check
852 cfi-flags
:= $(cfi-clang-flags
)
853 KBUILD_CFLAGS
+= $(cfi-flags
)
855 DISABLE_CFI
:= $(DISABLE_CFI_CLANG
)
856 DISABLE_LTO
+= $(DISABLE_CFI
)
860 # arch Makefile may override CC so keep this after arch Makefile is included
861 NOSTDINC_FLAGS
+= -nostdinc
-isystem
$(shell $(CC
) -print-file-name
=include)
862 CHECKFLAGS
+= $(NOSTDINC_FLAGS
)
864 # warn about C99 declaration after statement
865 KBUILD_CFLAGS
+= $(call cc-option
,-Wdeclaration-after-statement
,)
867 # disable pointer signed / unsigned warnings in gcc 4.0
868 KBUILD_CFLAGS
+= $(call cc-disable-warning
, pointer-sign
)
870 # disable stringop warnings in gcc 8+
871 KBUILD_CFLAGS
+= $(call cc-disable-warning
, stringop-truncation
)
873 # disable invalid "can't wrap" optimizations for signed / pointers
874 KBUILD_CFLAGS
+= $(call cc-option
,-fno-strict-overflow
)
876 # clang sets -fmerge-all-constants by default as optimization, but this
877 # is non-conforming behavior for C and in fact breaks the kernel, so we
878 # need to disable it here generally.
879 KBUILD_CFLAGS
+= $(call cc-option
,-fno-merge-all-constants
)
881 # for gcc -fno-merge-all-constants disables everything, but it is fine
882 # to have actual conforming behavior enabled.
883 KBUILD_CFLAGS
+= $(call cc-option
,-fmerge-constants
)
885 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
886 KBUILD_CFLAGS
+= $(call cc-option
,-fno-stack-check
,)
888 # conserve stack if available
889 KBUILD_CFLAGS
+= $(call cc-option
,-fconserve-stack
)
891 # disallow errors like 'EXPORT_GPL(foo);' with missing header
892 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=implicit-int
)
894 # require functions to have arguments in prototypes, not empty 'int foo()'
895 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=strict-prototypes
)
897 # Prohibit date/time macros, which would make the build non-deterministic
898 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=date-time
)
900 # enforce correct pointer usage
901 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=incompatible-pointer-types
)
903 # Require designated initializers for all marked structures
904 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=designated-init
)
906 # use the deterministic mode of AR if available
907 KBUILD_ARFLAGS
:= $(call ar-option
,D
)
909 include scripts
/Makefile.kasan
910 include scripts
/Makefile.extrawarn
911 include scripts
/Makefile.ubsan
913 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
915 KBUILD_CPPFLAGS
+= $(ARCH_CPPFLAGS
) $(KCPPFLAGS
)
916 KBUILD_AFLAGS
+= $(ARCH_AFLAGS
) $(KAFLAGS
)
917 KBUILD_CFLAGS
+= $(ARCH_CFLAGS
) $(KCFLAGS
)
919 # Use --build-id when available.
920 LDFLAGS_BUILD_ID
:= $(patsubst -Wl
$(comma
)%,%,\
921 $(call cc-ldoption
, -Wl
$(comma
)--build-id
,))
922 KBUILD_LDFLAGS_MODULE
+= $(LDFLAGS_BUILD_ID
)
923 LDFLAGS_vmlinux
+= $(LDFLAGS_BUILD_ID
)
925 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
926 LDFLAGS_vmlinux
+= $(call ld-option
, --gc-sections
,)
929 ifeq ($(CONFIG_STRIP_ASM_SYMS
),y
)
930 LDFLAGS_vmlinux
+= $(call ld-option
, -X
,)
933 # Default kernel image to build when no specific target is given.
934 # KBUILD_IMAGE may be overruled on the command line or
935 # set in the environment
936 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
938 export KBUILD_IMAGE ?
= vmlinux
941 # INSTALL_PATH specifies where to place the updated kernel and system map
942 # images. Default is /boot, but you can set it to other values
943 export INSTALL_PATH ?
= /boot
946 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
947 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
948 # an argument if needed. Otherwise it defaults to the kernel install path
950 export INSTALL_DTBS_PATH ?
= $(INSTALL_PATH
)/dtbs
/$(KERNELRELEASE
)
953 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
954 # relocations required by build roots. This is not defined in the
955 # makefile but the argument can be passed to make if needed.
958 MODLIB
= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
962 # INSTALL_MOD_STRIP, if defined, will cause modules to be
963 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
964 # the default option --strip-debug will be used. Otherwise,
965 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
967 ifdef INSTALL_MOD_STRIP
968 ifeq ($(INSTALL_MOD_STRIP
),1)
969 mod_strip_cmd
= $(STRIP
) --strip-debug
971 mod_strip_cmd
= $(STRIP
) $(INSTALL_MOD_STRIP
)
972 endif # INSTALL_MOD_STRIP=1
975 endif # INSTALL_MOD_STRIP
978 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
979 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
980 # or CONFIG_MODULE_COMPRESS_XZ.
982 mod_compress_cmd
= true
983 ifdef CONFIG_MODULE_COMPRESS
984 ifdef CONFIG_MODULE_COMPRESS_GZIP
985 mod_compress_cmd
= gzip
-n
-f
986 endif # CONFIG_MODULE_COMPRESS_GZIP
987 ifdef CONFIG_MODULE_COMPRESS_XZ
988 mod_compress_cmd
= xz
-f
989 endif # CONFIG_MODULE_COMPRESS_XZ
990 endif # CONFIG_MODULE_COMPRESS
991 export mod_compress_cmd
993 # Select initial ramdisk compression format, default is gzip(1).
994 # This shall be used by the dracut(8) tool while creating an initramfs image.
996 INITRD_COMPRESS-y
:= gzip
997 INITRD_COMPRESS-
$(CONFIG_RD_BZIP2
) := bzip2
998 INITRD_COMPRESS-
$(CONFIG_RD_LZMA
) := lzma
999 INITRD_COMPRESS-
$(CONFIG_RD_XZ
) := xz
1000 INITRD_COMPRESS-
$(CONFIG_RD_LZO
) := lzo
1001 INITRD_COMPRESS-
$(CONFIG_RD_LZ4
) := lz4
1002 # do not export INITRD_COMPRESS, since we didn't actually
1003 # choose a sane default compression above.
1004 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
1006 ifdef CONFIG_MODULE_SIG_ALL
1007 $(eval
$(call config_filename
,MODULE_SIG_KEY
))
1009 mod_sign_cmd
= scripts
/sign-file
$(CONFIG_MODULE_SIG_HASH
) $(MODULE_SIG_KEY_SRCPREFIX
)$(CONFIG_MODULE_SIG_KEY
) certs
/signing_key.x509
1015 ifdef CONFIG_STACK_VALIDATION
1016 has_libelf
:= $(call try-run
,\
1017 echo
"int main() {}" |
$(HOSTCC
) -xc
-o
/dev
/null
-lelf
-,1,0)
1018 ifeq ($(has_libelf
),1)
1019 objtool_target
:= tools
/objtool FORCE
1021 SKIP_STACK_VALIDATION
:= 1
1022 export SKIP_STACK_VALIDATION
1027 ifeq ($(KBUILD_EXTMOD
),)
1028 core-y
+= kernel
/ certs
/ mm
/ fs
/ ipc
/ security
/ crypto
/ block
/
1030 vmlinux-dirs
:= $(patsubst %/,%,$(filter %/, $(init-y
) $(init-m
) \
1031 $(core-y
) $(core-m
) $(drivers-y
) $(drivers-m
) \
1032 $(net-y
) $(net-m
) $(libs-y
) $(libs-m
) $(virt-y
)))
1034 vmlinux-alldirs
:= $(sort $(vmlinux-dirs
) $(patsubst %/,%,$(filter %/, \
1035 $(init-
) $(core-
) $(drivers-
) $(net-
) $(libs-
) $(virt-
))))
1037 init-y
:= $(patsubst %/, %/built-in.o
, $(init-y
))
1038 core-y
:= $(patsubst %/, %/built-in.o
, $(core-y
))
1039 drivers-y
:= $(patsubst %/, %/built-in.o
, $(drivers-y
))
1040 net-y
:= $(patsubst %/, %/built-in.o
, $(net-y
))
1041 libs-y1
:= $(patsubst %/, %/lib.a
, $(libs-y
))
1042 libs-y2
:= $(filter-out %.a
, $(patsubst %/, %/built-in.o
, $(libs-y
)))
1043 virt-y
:= $(patsubst %/, %/built-in.o
, $(virt-y
))
1045 # Externally visible symbols (used by link-vmlinux.sh)
1046 export KBUILD_VMLINUX_INIT
:= $(head-y
) $(init-y
)
1047 export KBUILD_VMLINUX_MAIN
:= $(core-y
) $(libs-y2
) $(drivers-y
) $(net-y
) $(virt-y
)
1048 export KBUILD_VMLINUX_LIBS
:= $(libs-y1
)
1049 export KBUILD_LDS
:= arch
/$(SRCARCH
)/kernel
/vmlinux.lds
1050 export LDFLAGS_vmlinux
1051 # used by scripts/package/Makefile
1052 export KBUILD_ALLDIRS
:= $(sort $(filter-out arch
/%,$(vmlinux-alldirs
)) arch Documentation
include samples scripts tools
)
1054 vmlinux-deps
:= $(KBUILD_LDS
) $(KBUILD_VMLINUX_INIT
) $(KBUILD_VMLINUX_MAIN
) $(KBUILD_VMLINUX_LIBS
)
1056 # Include targets which we want to execute sequentially if the rest of the
1057 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
1058 # evaluated more than once.
1059 PHONY
+= vmlinux_prereq
1060 vmlinux_prereq
: $(vmlinux-deps
) FORCE
1061 ifdef CONFIG_HEADERS_CHECK
1062 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile headers_check
1064 ifdef CONFIG_GDB_SCRIPTS
1065 $(Q
)ln
-fsn
$(abspath
$(srctree
)/scripts
/gdb
/vmlinux-gdb.py
)
1067 ifdef CONFIG_TRIM_UNUSED_KSYMS
1068 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/adjust_autoksyms.sh \
1069 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1072 # standalone target for easier testing
1073 include/generated
/autoksyms.h
: FORCE
1074 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/adjust_autoksyms.sh true
1076 ARCH_POSTLINK
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/Makefile.postlink
)
1078 # Final link of vmlinux with optional arch pass after final link
1079 cmd_link-vmlinux
= \
1080 $(CONFIG_SHELL
) $< $(LD
) $(LDFLAGS
) $(LDFLAGS_vmlinux
) ; \
1081 $(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) $@
, true
)
1083 vmlinux
: scripts
/link-vmlinux.sh vmlinux_prereq
$(vmlinux-deps
) FORCE
1084 +$(call if_changed
,link-vmlinux
)
1086 # Build samples along the rest of the kernel
1087 ifdef CONFIG_SAMPLES
1088 vmlinux-dirs
+= samples
1091 # The actual objects are generated when descending,
1092 # make sure no implicit rule kicks in
1093 $(sort $(vmlinux-deps
)): $(vmlinux-dirs
) ;
1095 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1096 # Preset locale variables to speed up the build process. Limit locale
1097 # tweaks to this spot to avoid wrong language settings when running
1098 # make menuconfig etc.
1099 # Error messages still appears in the original language
1101 PHONY
+= $(vmlinux-dirs
)
1102 $(vmlinux-dirs
): prepare scripts
1103 $(Q
)$(MAKE
) $(build
)=$@
1105 define filechk_kernel.release
1106 echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1109 # Store (new) KERNELRELEASE string in include/config/kernel.release
1110 include/config
/kernel.release
: include/config
/auto.conf FORCE
1111 $(call filechk
,kernel.release
)
1114 # Things we need to do before we recursively start building the kernel
1115 # or the modules are listed in "prepare".
1116 # A multi level approach is used. prepareN is processed before prepareN-1.
1117 # archprepare is used in arch Makefiles and when processed asm symlink,
1118 # version.h and scripts_basic is processed / created.
1120 # Listed in dependency order
1121 PHONY
+= prepare archprepare prepare0 prepare1 prepare2 prepare3
1123 # prepare3 is used to check if we are building in a separate output directory,
1125 # 1) Check that make has not been executed in the kernel src $(srctree)
1126 prepare3
: include/config
/kernel.release
1127 ifneq ($(KBUILD_SRC
),)
1128 @
$(kecho
) ' Using $(srctree) as source for kernel'
1129 $(Q
)if
[ -f
$(srctree
)/.config
-o
-d
$(srctree
)/include/config
]; then \
1130 echo
>&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1131 echo
>&2 " in the '$(srctree)' directory.";\
1136 # prepare2 creates a makefile if using a separate output directory.
1137 # From this point forward, .config has been reprocessed, so any rules
1138 # that need to depend on updated CONFIG_* values can be checked here.
1139 prepare2
: prepare3 prepare-compiler-check outputmakefile asm-generic
1141 prepare1
: prepare2
$(version_h
) include/generated
/utsrelease.h \
1142 include/config
/auto.conf
1145 archprepare
: archheaders archscripts prepare1 scripts_basic
1147 prepare0
: archprepare gcc-plugins
1148 $(Q
)$(MAKE
) $(build
)=.
1150 # All the preparing..
1151 prepare
: prepare0 prepare-objtool
1153 # Support for using generic headers in asm-generic
1154 PHONY
+= asm-generic uapi-asm-generic
1155 asm-generic
: uapi-asm-generic
1156 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.asm-generic \
1157 src
=asm obj
=arch
/$(SRCARCH
)/include/generated
/asm
1159 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.asm-generic \
1160 src
=uapi
/asm obj
=arch
/$(SRCARCH
)/include/generated
/uapi
/asm
1162 PHONY
+= prepare-objtool
1163 prepare-objtool
: $(objtool_target
)
1164 ifeq ($(SKIP_STACK_VALIDATION
),1)
1165 ifdef CONFIG_UNWINDER_ORC
1166 @echo
"error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1169 @echo
"warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1173 # Check for CONFIG flags that require compiler support. Abort the build
1174 # after .config has been processed, but before the kernel build starts.
1176 # For security-sensitive CONFIG options, we don't want to fallback and/or
1177 # silently change which compiler flags will be used, since that leads to
1178 # producing kernels with different security feature characteristics
1179 # depending on the compiler used. (For example, "But I selected
1180 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1181 PHONY
+= prepare-compiler-check
1182 prepare-compiler-check
: FORCE
1183 # Make sure we're using a supported toolchain with LTO_CLANG
1184 ifdef CONFIG_LTO_CLANG
1185 ifneq ($(call clang-ifversion
, -ge
, 0500, y
), y
)
1186 @echo Cannot use CONFIG_LTO_CLANG
: requires clang
5.0 or later
>&2 && exit
1
1188 ifneq ($(call gold-ifversion
, -ge
, 112000000, y
), y
)
1189 @echo Cannot use CONFIG_LTO_CLANG
: requires GNU gold
1.12 or later
>&2 && exit
1
1192 # Make sure compiler supports LTO flags
1194 ifeq ($(call cc-option
, $(lto-flags
)),)
1195 @echo Cannot use CONFIG_LTO
: $(lto-flags
) not supported by compiler \
1199 # Make sure compiler supports requested stack protector flag.
1201 ifeq ($(call cc-option
, $(stackp-flag
)),)
1202 @echo Cannot use CONFIG_CC_STACKPROTECTOR_
$(stackp-name
): \
1203 $(stackp-flag
) not supported by compiler
>&2 && exit
1
1206 # Make sure compiler does not have buggy stack-protector support.
1208 ifneq ($(shell $(CONFIG_SHELL
) $(stackp-check
) $(CC
) $(KBUILD_CPPFLAGS
) $(biarch
)),y
)
1209 @echo Cannot use CONFIG_CC_STACKPROTECTOR_
$(stackp-name
): \
1210 $(stackp-flag
) available but compiler is broken
>&2 && exit
1
1214 ifeq ($(call cc-option
, $(cfi-flags
)),)
1215 @echo Cannot use CONFIG_CFI
: $(cfi-flags
) not supported by compiler
>&2 && exit
1
1220 # Generate some files
1221 # ---------------------------------------------------------------------------
1223 # KERNELRELEASE can change from a few different places, meaning version.h
1224 # needs to be updated, so this check is forced on all builds
1227 define filechk_utsrelease.h
1228 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
1229 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1232 (echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1235 define filechk_version.h
1236 (echo \
#define LINUX_VERSION_CODE $(shell \
1237 expr
$(VERSION
) \
* 65536 + 0$(PATCHLEVEL
) \
* 256 + 0$(SUBLEVEL
)); \
1238 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1241 $(version_h
): $(srctree
)/Makefile FORCE
1242 $(call filechk
,version.h
)
1243 $(Q
)rm -f
$(old_version_h
)
1245 include/generated
/utsrelease.h
: include/config
/kernel.release FORCE
1246 $(call filechk
,utsrelease.h
)
1250 $(Q
)find
$(srctree
)/include/ -name
'*.h' | xargs
--max-args
1 \
1251 $(srctree
)/scripts
/headerdep.pl
-I
$(srctree
)/include
1253 # ---------------------------------------------------------------------------
1256 #Default location for installed headers
1257 export INSTALL_HDR_PATH
= $(objtree
)/usr
1259 # If we do an all arch process set dst to include/arch-$(hdr-arch)
1260 hdr-dst
= $(if
$(KBUILD_HEADERS
), dst
=include/arch-
$(hdr-arch
), dst
=include)
1262 PHONY
+= archheaders
1265 PHONY
+= archscripts
1269 __headers
: $(version_h
) scripts_basic uapi-asm-generic archheaders archscripts
1270 $(Q
)$(MAKE
) $(build
)=scripts build_unifdef
1272 PHONY
+= headers_install_all
1273 headers_install_all
:
1274 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
install
1276 PHONY
+= headers_install
1277 headers_install
: __headers
1278 $(if
$(wildcard $(srctree
)/arch
/$(hdr-arch
)/include/uapi
/asm
/Kbuild
),, \
1279 $(error Headers not exportable for the
$(SRCARCH
) architecture
))
1280 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi dst
=include
1281 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(hdr-arch
)/include/uapi
$(hdr-dst
)
1283 PHONY
+= headers_check_all
1284 headers_check_all
: headers_install_all
1285 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
check
1287 PHONY
+= headers_check
1288 headers_check
: headers_install
1289 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi dst
=include HDRCHECK
=1
1290 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(hdr-arch
)/include/uapi
$(hdr-dst
) HDRCHECK
=1
1292 # ---------------------------------------------------------------------------
1297 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests run_tests
1299 PHONY
+= kselftest-clean
1301 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests
clean
1303 PHONY
+= kselftest-merge
1305 $(if
$(wildcard $(objtree
)/.config
),, $(error No .config exists
, config your kernel first
!))
1306 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/kconfig
/merge_config.sh \
1307 -m
$(objtree
)/.config \
1308 $(srctree
)/tools
/testing
/selftests
/*/config
1309 +$(Q
)$(MAKE
) -f
$(srctree
)/Makefile olddefconfig
1311 # ---------------------------------------------------------------------------
1314 ifdef CONFIG_MODULES
1316 # By default, build modules as well
1322 # A module can be listed more than once in obj-m resulting in
1323 # duplicate lines in modules.order files. Those are removed
1324 # using awk while concatenating to the final file.
1327 modules
: $(vmlinux-dirs
) $(if
$(KBUILD_BUILTIN
),vmlinux
) modules.builtin
1328 $(Q
)$(AWK
) '!x[$$0]++' $(vmlinux-dirs
:%=$(objtree
)/%/modules.order
) > $(objtree
)/modules.order
1329 @
$(kecho
) ' Building modules, stage 2.';
1330 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1332 modules.builtin
: $(vmlinux-dirs
:%=%/modules.builtin
)
1333 $(Q
)$(AWK
) '!x[$$0]++' $^
> $(objtree
)/modules.builtin
1335 %/modules.builtin
: include/config
/auto.conf
1336 $(Q
)$(MAKE
) $(modbuiltin
)=$*
1339 # Target to prepare building external modules
1340 PHONY
+= modules_prepare
1341 modules_prepare
: prepare scripts
1343 # Target to install modules
1344 PHONY
+= modules_install
1345 modules_install
: _modinst_ _modinst_post
1349 @
rm -rf
$(MODLIB
)/kernel
1350 @
rm -f
$(MODLIB
)/source
1351 @mkdir
-p
$(MODLIB
)/kernel
1352 @ln
-s
$(abspath
$(srctree
)) $(MODLIB
)/source
1353 @if
[ ! $(objtree
) -ef
$(MODLIB
)/build
]; then \
1354 rm -f
$(MODLIB
)/build
; \
1355 ln
-s
$(CURDIR
) $(MODLIB
)/build
; \
1357 @cp
-f
$(objtree
)/modules.order
$(MODLIB
)/
1358 @cp
-f
$(objtree
)/modules.builtin
$(MODLIB
)/
1359 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1361 # This depmod is only for convenience to give the initial
1362 # boot a modules.dep even before / is mounted read-write. However the
1363 # boot script depmod is the master version.
1364 PHONY
+= _modinst_post
1365 _modinst_post
: _modinst_
1368 ifeq ($(CONFIG_MODULE_SIG
), y
)
1369 PHONY
+= modules_sign
1371 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modsign
1374 else # CONFIG_MODULES
1376 # Modules not configured
1377 # ---------------------------------------------------------------------------
1379 PHONY
+= modules modules_install
1380 modules modules_install
:
1382 @echo
>&2 "The present kernel configuration has modules disabled."
1383 @echo
>&2 "Type 'make config' and enable loadable module support."
1384 @echo
>&2 "Then build a kernel with module support enabled."
1388 endif # CONFIG_MODULES
1391 # Cleaning is done on three levels.
1392 # make clean Delete most generated files
1393 # Leave enough to build external modules
1394 # make mrproper Delete the current configuration, and all generated files
1395 # make distclean Remove editor backup files, patch leftover files and the like
1397 # Directories & files removed with 'make clean'
1398 CLEAN_DIRS
+= $(MODVERDIR
)
1400 # Directories & files removed with 'make mrproper'
1401 MRPROPER_DIRS
+= include/config usr
/include include/generated \
1402 arch
/*/include/generated .tmp_objdiff
1403 MRPROPER_FILES
+= .config .config.old .version .old_version \
1404 Module.symvers
tags TAGS cscope
* GPATH GTAGS GRTAGS GSYMS \
1405 signing_key.pem signing_key.priv signing_key.x509 \
1406 x509.genkey extra_certificates signing_key.x509.keyid \
1407 signing_key.x509.signer vmlinux-gdb.py
1409 # clean - Delete most, but leave enough to build external modules
1411 clean: rm-dirs
:= $(CLEAN_DIRS
)
1412 clean: rm-files
:= $(CLEAN_FILES
)
1413 clean-dirs
:= $(addprefix _clean_
, .
$(vmlinux-alldirs
) Documentation samples
)
1415 PHONY
+= $(clean-dirs
) clean archclean vmlinuxclean
1417 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1420 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/link-vmlinux.sh
clean
1421 $(Q
)$(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) clean)
1423 clean: archclean vmlinuxclean
1425 # mrproper - Delete all generated files, including .config
1427 mrproper
: rm-dirs
:= $(wildcard $(MRPROPER_DIRS
))
1428 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
1429 mrproper-dirs
:= $(addprefix _mrproper_
,scripts
)
1431 PHONY
+= $(mrproper-dirs
) mrproper archmrproper
1433 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
1435 mrproper
: clean archmrproper
$(mrproper-dirs
)
1444 @find
$(srctree
) $(RCS_FIND_IGNORE
) \
1445 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
1446 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'*%' \
1447 -o
-name
'core' \
) \
1448 -type f
-print | xargs
rm -f
1451 # Packaging of the kernel to various formats
1452 # ---------------------------------------------------------------------------
1453 # rpm target kept for backward compatibility
1454 package-dir
:= scripts
/package
1457 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1458 %pkg
: include/config
/kernel.release FORCE
1459 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1460 rpm
: include/config
/kernel.release FORCE
1461 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1464 # Brief documentation of the typical targets used
1465 # ---------------------------------------------------------------------------
1467 boards
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*_defconfig
)
1468 boards
:= $(sort $(notdir $(boards
)))
1469 board-dirs
:= $(dir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*/*_defconfig
))
1470 board-dirs
:= $(sort $(notdir $(board-dirs
:/=)))
1474 @echo
'Cleaning targets:'
1475 @echo
' clean - Remove most generated files but keep the config and'
1476 @echo
' enough build support to build external modules'
1477 @echo
' mrproper - Remove all generated files + config + various backup files'
1478 @echo
' distclean - mrproper + remove editor backup and patch files'
1480 @echo
'Configuration targets:'
1481 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
1483 @echo
'Other generic targets:'
1484 @echo
' all - Build all targets marked with [*]'
1485 @echo
'* vmlinux - Build the bare kernel'
1486 @echo
'* modules - Build all modules'
1487 @echo
' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1488 @echo
' dir/ - Build all files in dir and below'
1489 @echo
' dir/file.[ois] - Build specified target only'
1490 @echo
' dir/file.ll - Build the LLVM assembly file'
1491 @echo
' (requires compiler support for LLVM assembly generation)'
1492 @echo
' dir/file.lst - Build specified mixed source/assembly target only'
1493 @echo
' (requires a recent binutils and recent build (System.map))'
1494 @echo
' dir/file.ko - Build module including final link'
1495 @echo
' modules_prepare - Set up for building external modules'
1496 @echo
' tags/TAGS - Generate tags file for editors'
1497 @echo
' cscope - Generate cscope index'
1498 @echo
' gtags - Generate GNU GLOBAL index'
1499 @echo
' kernelrelease - Output the release version string (use with make -s)'
1500 @echo
' kernelversion - Output the version stored in Makefile (use with make -s)'
1501 @echo
' image_name - Output the image name (use with make -s)'
1502 @echo
' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1503 echo
' (default: $(INSTALL_HDR_PATH))'; \
1505 @echo
'Static analysers:'
1506 @echo
' checkstack - Generate a list of stack hogs'
1507 @echo
' namespacecheck - Name space analysis on compiled kernel'
1508 @echo
' versioncheck - Sanity check on version.h usage'
1509 @echo
' includecheck - Check for duplicate included header files'
1510 @echo
' export_report - List the usages of all exported symbols'
1511 @echo
' headers_check - Sanity check on exported headers'
1512 @echo
' headerdep - Detect inclusion cycles in headers'
1513 @
$(MAKE
) -f
$(srctree
)/scripts
/Makefile.help checker-help
1515 @echo
'Kernel selftest:'
1516 @echo
' kselftest - Build and run kernel selftest (run as root)'
1517 @echo
' Build, install, and boot kernel before'
1518 @echo
' running kselftest on it'
1519 @echo
' kselftest-clean - Remove all generated kselftest files'
1520 @echo
' kselftest-merge - Merge all the config dependencies of kselftest to existing'
1523 @echo
'Userspace tools targets:'
1524 @echo
' use "make tools/help"'
1525 @echo
' or "cd tools; make help"'
1527 @echo
'Kernel packaging:'
1528 @
$(MAKE
) $(build
)=$(package-dir
) help
1530 @echo
'Documentation targets:'
1531 @
$(MAKE
) -f
$(srctree
)/Documentation
/Makefile dochelp
1533 @echo
'Architecture specific targets ($(SRCARCH)):'
1534 @
$(if
$(archhelp
),$(archhelp
),\
1535 echo
' No architecture specific help defined for $(SRCARCH)')
1538 $(foreach b
, $(boards
), \
1539 printf
" %-24s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
1541 @
$(if
$(board-dirs
), \
1542 $(foreach b
, $(board-dirs
), \
1543 printf
" %-16s - Show %s-specific targets\\n" help-
$(b
) $(b
);) \
1544 printf
" %-16s - Show all of the above\\n" help-boards
; \
1547 @echo
' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1548 @echo
' make V=2 [targets] 2 => give reason for rebuild of target'
1549 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
1550 @echo
' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1551 @echo
' make C=2 [targets] Force check of all c source with $$CHECK'
1552 @echo
' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1553 @echo
' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1554 @echo
' 1: warnings which may be relevant and do not occur too often'
1555 @echo
' 2: warnings which occur quite often but may still be relevant'
1556 @echo
' 3: more obscure warnings, can most likely be ignored'
1557 @echo
' Multiple levels can be combined with W=12 or W=123'
1559 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
1560 @echo
'For further info see the ./README file'
1563 help-board-dirs
:= $(addprefix help-
,$(board-dirs
))
1565 help-boards
: $(help-board-dirs
)
1567 boards-per-dir
= $(sort $(notdir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/$*/*_defconfig
)))
1569 $(help-board-dirs
): help-
%:
1570 @echo
'Architecture specific targets ($(SRCARCH) $*):'
1571 @
$(if
$(boards-per-dir
), \
1572 $(foreach b
, $(boards-per-dir
), \
1573 printf
" %-24s - Build for %s\\n" $*/$(b
) $(subst _defconfig
,,$(b
));) \
1577 # Documentation targets
1578 # ---------------------------------------------------------------------------
1579 DOC_TARGETS
:= xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs linkcheckdocs
1580 PHONY
+= $(DOC_TARGETS
)
1581 $(DOC_TARGETS
): scripts_basic FORCE
1582 $(Q
)$(MAKE
) $(build
)=Documentation
$@
1584 else # KBUILD_EXTMOD
1587 # External module support.
1588 # When building external modules the kernel used as basis is considered
1589 # read-only, and no consistency checks are made and the make
1590 # system is not used on the basis kernel. If updates are required
1591 # in the basis kernel ordinary make commands (without M=...) must
1594 # The following are the only valid targets when building external
1596 # make M=dir clean Delete all automatically generated files
1597 # make M=dir modules Make all modules in specified dir
1598 # make M=dir Same as 'make M=dir modules'
1599 # make M=dir modules_install
1600 # Install the modules built in the module directory
1601 # Assumes install directory is already created
1603 # We are always building modules
1605 PHONY
+= crmodverdir
1609 PHONY
+= $(objtree
)/Module.symvers
1610 $(objtree
)/Module.symvers
:
1611 @
test -e
$(objtree
)/Module.symvers ||
( \
1613 echo
" WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1614 echo
" is missing; modules will have no dependencies and modversions."; \
1617 module-dirs
:= $(addprefix _module_
,$(KBUILD_EXTMOD
))
1618 PHONY
+= $(module-dirs
) modules
1619 $(module-dirs
): crmodverdir
$(objtree
)/Module.symvers
1620 $(Q
)$(MAKE
) $(build
)=$(patsubst _module_
%,%,$@
)
1622 modules
: $(module-dirs
)
1623 @
$(kecho
) ' Building modules, stage 2.';
1624 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1626 PHONY
+= modules_install
1627 modules_install
: _emodinst_ _emodinst_post
1629 install-dir
:= $(if
$(INSTALL_MOD_DIR
),$(INSTALL_MOD_DIR
),extra
)
1632 $(Q
)mkdir
-p
$(MODLIB
)/$(install-dir
)
1633 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1635 PHONY
+= _emodinst_post
1636 _emodinst_post
: _emodinst_
1639 clean-dirs
:= $(addprefix _clean_
,$(KBUILD_EXTMOD
))
1641 PHONY
+= $(clean-dirs
) clean
1643 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1645 clean: rm-dirs
:= $(MODVERDIR
)
1646 clean: rm-files
:= $(KBUILD_EXTMOD
)/Module.symvers
1650 @echo
' Building external modules.'
1651 @echo
' Syntax: make -C path/to/kernel/src M=$$PWD target'
1653 @echo
' modules - default target, build the module(s)'
1654 @echo
' modules_install - install the module'
1655 @echo
' clean - remove generated files in module directory only'
1659 PHONY
+= prepare scripts
1662 endif # KBUILD_EXTMOD
1664 clean: $(clean-dirs
)
1667 @find
$(if
$(KBUILD_EXTMOD
), $(KBUILD_EXTMOD
), .
) $(RCS_FIND_IGNORE
) \
1668 \
( -name
'*.[oas]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
1672 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
1673 -o
-name
'*.symtypes' -o
-name
'modules.order' \
1674 -o
-name modules.builtin
-o
-name
'.tmp_*.o.*' \
1675 -o
-name
'*.c.[012]*.*' \
1678 -o
-name
'*.*.symversions' \
) -type f
-print | xargs
rm -f
1680 # Generate tags for editors
1681 # ---------------------------------------------------------------------------
1682 quiet_cmd_tags
= GEN
$@
1683 cmd_tags
= $(CONFIG_SHELL
) $(srctree
)/scripts
/tags.sh
$@
1685 tags TAGS cscope gtags
: FORCE
1688 # Scripts to check various things for consistency
1689 # ---------------------------------------------------------------------------
1691 PHONY
+= includecheck versioncheck coccicheck namespacecheck export_report
1694 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1695 -name
'*.[hcS]' -type f
-print |
sort \
1696 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkincludes.pl
1699 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1700 -name
'*.[hcS]' -type f
-print |
sort \
1701 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkversion.pl
1704 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/$@
1707 $(PERL
) $(srctree
)/scripts
/namespace.pl
1710 $(PERL
) $(srctree
)/scripts
/export_report.pl
1712 endif #ifeq ($(config-targets),1)
1713 endif #ifeq ($(mixed-targets),1)
1715 PHONY
+= checkstack kernelrelease kernelversion image_name
1717 # UML needs a little special treatment here. It wants to use the host
1718 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1719 # else wants $(ARCH), including people doing cross-builds, which means
1720 # that $(SUBARCH) doesn't work here.
1722 CHECKSTACK_ARCH
:= $(SUBARCH
)
1724 CHECKSTACK_ARCH
:= $(ARCH
)
1727 $(OBJDUMP
) -d vmlinux
$$(find .
-name
'*.ko') | \
1728 $(PERL
) $(src
)/scripts
/checkstack.pl
$(CHECKSTACK_ARCH
)
1731 @echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1734 @echo
$(KERNELVERSION
)
1737 @echo
$(KBUILD_IMAGE
)
1739 # Clear a bunch of variables before executing the submake
1741 $(Q
)mkdir
-p
$(objtree
)/tools
1742 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(src
)/tools
/
1745 $(Q
)mkdir
-p
$(objtree
)/tools
1746 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(src
)/tools
/ $*
1749 # ---------------------------------------------------------------------------
1750 # Single targets are compatible with:
1751 # - build with mixed source and output
1752 # - build with separate output dir 'make O=...'
1753 # - external modules
1755 # target-dir => where to store outputfile
1756 # build-dir => directory in kernel source tree to use
1758 ifeq ($(KBUILD_EXTMOD
),)
1759 build-dir
= $(patsubst %/,%,$(dir $@
))
1760 target-dir
= $(dir $@
)
1762 zap-slash
=$(filter-out .
,$(patsubst %/,%,$(dir $@
)))
1763 build-dir
= $(KBUILD_EXTMOD
)$(if
$(zap-slash
),/$(zap-slash
))
1764 target-dir
= $(if
$(KBUILD_EXTMOD
),$(dir $<),$(dir $@
))
1767 %.s
: %.c prepare scripts FORCE
1768 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1769 %.i
: %.c prepare scripts FORCE
1770 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1771 %.o
: %.c prepare scripts FORCE
1772 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1773 %.lst
: %.c prepare scripts FORCE
1774 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1775 %.s
: %.S prepare scripts FORCE
1776 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1777 %.o
: %.S prepare scripts FORCE
1778 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1779 %.symtypes
: %.c prepare scripts FORCE
1780 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1781 %.ll
: %.c prepare scripts FORCE
1782 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1785 /: prepare scripts FORCE
1787 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1788 $(build
)=$(build-dir
)
1789 # Make sure the latest headers are built for Documentation
1790 Documentation
/ samples
/: headers_install
1791 %/: prepare scripts FORCE
1793 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1794 $(build
)=$(build-dir
)
1795 %.ko
: prepare scripts FORCE
1797 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1798 $(build
)=$(build-dir
) $(@
:.ko
=.o
)
1799 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1801 # FIXME Should go into a make.lib or something
1802 # ===========================================================================
1804 quiet_cmd_rmdirs
= $(if
$(wildcard $(rm-dirs
)),CLEAN
$(wildcard $(rm-dirs
)))
1805 cmd_rmdirs
= rm -rf
$(rm-dirs
)
1807 quiet_cmd_rmfiles
= $(if
$(wildcard $(rm-files
)),CLEAN
$(wildcard $(rm-files
)))
1808 cmd_rmfiles
= rm -f
$(rm-files
)
1810 # Run depmod only if we have System.map and depmod is executable
1811 quiet_cmd_depmod
= DEPMOD
$(KERNELRELEASE
)
1812 cmd_depmod
= $(CONFIG_SHELL
) $(srctree
)/scripts
/depmod.sh
$(DEPMOD
) \
1813 $(KERNELRELEASE
) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1815 # Create temporary dir for module support files
1816 # clean it up only when building all modules
1817 cmd_crmodverdir
= $(Q
)mkdir
-p
$(MODVERDIR
) \
1818 $(if
$(KBUILD_MODULES
),; rm -f
$(MODVERDIR
)/*)
1820 # read all saved command lines
1822 targets
:= $(wildcard $(sort $(targets
)))
1823 cmd_files
:= $(wildcard .
*.cmd
$(foreach f
,$(targets
),$(dir $(f
)).
$(notdir $(f
)).cmd
))
1825 ifneq ($(cmd_files
),)
1826 $(cmd_files
): ; # Do not try to update included dependency files
1827 include $(cmd_files
)
1830 endif # skip-makefile
1835 # Declare the contents of the .PHONY variable as phony. We keep that
1836 # information in a variable so we can use it in if_changed and friends.