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
))
148 @lib
/libdss-build.sh
$(KBUILD_OUTPUT
)/
150 # Leave processing to above invocation of make
152 endif # ifneq ($(KBUILD_OUTPUT),)
153 endif # ifeq ($(KBUILD_SRC),)
155 # We process the rest of the Makefile if this is the final invocation of make
156 ifeq ($(skip-makefile
),)
158 # Do not print "Entering directory ...",
159 # but we want to display it when entering to the output directory
160 # so that IDEs/editors are able to understand relative filenames.
161 MAKEFLAGS
+= --no-print-directory
163 # Call a source code checker (by default, "sparse") as part of the
166 # Use 'make C=1' to enable checking of only re-compiled files.
167 # Use 'make C=2' to enable checking of *all* source files, regardless
168 # of whether they are re-compiled or not.
170 # See the file "Documentation/dev-tools/sparse.rst" for more details,
171 # including where to get the "sparse" utility.
173 ifeq ("$(origin C)", "command line")
174 KBUILD_CHECKSRC
= $(C
)
176 ifndef KBUILD_CHECKSRC
180 # Use make M=dir to specify directory of external module to build
181 # Old syntax make ... SUBDIRS=$PWD is still supported
182 # Setting the environment variable KBUILD_EXTMOD take precedence
184 KBUILD_EXTMOD ?
= $(SUBDIRS
)
187 ifeq ("$(origin M)", "command line")
188 KBUILD_EXTMOD
:= $(M
)
191 ifeq ($(KBUILD_SRC
),)
192 # building in the source tree
195 ifeq ($(KBUILD_SRC
)/,$(dir $(CURDIR
)))
196 # building in a subdirectory of the source tree
199 srctree
:= $(KBUILD_SRC
)
203 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
209 VPATH
:= $(srctree
)$(if
$(KBUILD_EXTMOD
),:$(KBUILD_EXTMOD
))
211 export srctree objtree VPATH
213 # To make sure we do not include .config for any of the *config targets
214 # catch them early, and hand them over to scripts/kconfig/Makefile
215 # It is allowed to specify more targets when calling make, including
216 # mixing *config targets and build targets.
217 # For example 'make oldconfig all'.
218 # Detect when mixed targets is specified, and make a second invocation
219 # of make so .config is not included in this case either (for *config).
221 version_h
:= include/generated
/uapi
/linux
/version.h
222 old_version_h
:= include/linux
/version.h
224 no-dot-config-targets
:= clean mrproper
distclean \
225 cscope gtags TAGS
tags help
% %docs
check% coccicheck \
226 $(version_h
) headers_
% archheaders archscripts \
227 kernelversion
%src-pkg
233 ifneq ($(filter $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
234 ifeq ($(filter-out $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
239 ifeq ($(KBUILD_EXTMOD
),)
240 ifneq ($(filter config
%config
,$(MAKECMDGOALS
)),)
242 ifneq ($(words $(MAKECMDGOALS
)),1)
247 # install and modules_install need also be processed one by one
248 ifneq ($(filter install,$(MAKECMDGOALS
)),)
249 ifneq ($(filter modules_install
,$(MAKECMDGOALS
)),)
254 ifeq ($(mixed-targets
),1)
255 # ===========================================================================
256 # We're called with mixed targets (*config and build targets).
257 # Handle them one by one.
259 PHONY
+= $(MAKECMDGOALS
) __build_one_by_one
261 $(filter-out __build_one_by_one
, $(MAKECMDGOALS
)): __build_one_by_one
266 for i in
$(MAKECMDGOALS
); do \
267 $(MAKE
) -f
$(srctree
)/Makefile
$$i; \
272 # We need some generic definitions (do not try to remake the file).
273 scripts
/Kbuild.
include: ;
274 include scripts
/Kbuild.
include
276 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
277 KERNELRELEASE
= $(shell cat
include/config
/kernel.release
2> /dev
/null
)
278 KERNELVERSION
= $(VERSION
)$(if
$(PATCHLEVEL
),.
$(PATCHLEVEL
)$(if
$(SUBLEVEL
),.
$(SUBLEVEL
)))$(EXTRAVERSION
)
279 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
281 # SUBARCH tells the usermode build what the underlying arch is. That is set
282 # first, and if a usermode build is happening, the "ARCH=um" on the command
283 # line overrides the setting of ARCH below. If a native build is happening,
284 # then ARCH is assigned, getting whatever value it gets normally, and
285 # SUBARCH is subsequently ignored.
287 SUBARCH
:= $(shell uname
-m | sed
-e s
/i
.86/x86
/ -e s
/x86_64
/x86
/ \
288 -e s
/sun4u
/sparc64
/ \
289 -e s
/arm.
*/arm
/ -e s
/sa110
/arm
/ \
290 -e s
/s390x
/s390
/ -e s
/parisc64
/parisc
/ \
291 -e s
/ppc.
*/powerpc
/ -e s
/mips.
*/mips
/ \
292 -e s
/sh
[234].
*/sh
/ -e s
/aarch64.
*/arm64
/ )
294 # Cross compiling and selecting different set of gcc/bin-utils
295 # ---------------------------------------------------------------------------
297 # When performing cross compilation for other architectures ARCH shall be set
298 # to the target architecture. (See arch/* for the possibilities).
299 # ARCH can be set during invocation of make:
301 # Another way is to have ARCH set in the environment.
302 # The default ARCH is the host where make is executed.
304 # CROSS_COMPILE specify the prefix used for all executables used
305 # during compilation. Only gcc and related bin-utils executables
306 # are prefixed with $(CROSS_COMPILE).
307 # CROSS_COMPILE can be set on the command line
308 # make CROSS_COMPILE=ia64-linux-
309 # Alternatively CROSS_COMPILE can be set in the environment.
310 # A third alternative is to store a setting in .config so that plain
311 # "make" in the configured kernel build directory always uses that.
312 # Default value for CROSS_COMPILE is not to prefix executables
313 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
315 CROSS_COMPILE ?
= $(CONFIG_CROSS_COMPILE
:"%"=%)
317 # Architecture as present in compile.h
318 UTS_MACHINE
:= $(ARCH
)
321 # Additional ARCH settings for x86
325 ifeq ($(ARCH
),x86_64
)
329 # Additional ARCH settings for sparc
330 ifeq ($(ARCH
),sparc32
)
333 ifeq ($(ARCH
),sparc64
)
337 # Additional ARCH settings for sh
342 # Additional ARCH settings for tile
343 ifeq ($(ARCH
),tilepro
)
346 ifeq ($(ARCH
),tilegx
)
350 # Where to locate arch specific headers
351 hdr-arch
:= $(SRCARCH
)
353 KCONFIG_CONFIG ?
= .config
354 export KCONFIG_CONFIG
356 # SHELL used by kbuild
357 CONFIG_SHELL
:= $(shell if
[ -x
"$$BASH" ]; then echo
$$BASH; \
358 else if
[ -x
/bin
/bash
]; then echo
/bin
/bash
; \
359 else echo sh
; fi
; fi
)
361 HOST_LFS_CFLAGS
:= $(shell getconf LFS_CFLAGS
2>/dev
/null
)
362 HOST_LFS_LDFLAGS
:= $(shell getconf LFS_LDFLAGS
2>/dev
/null
)
363 HOST_LFS_LIBS
:= $(shell getconf LFS_LIBS
2>/dev
/null
)
367 HOSTCFLAGS
:= -Wall
-Wmissing-prototypes
-Wstrict-prototypes
-O2 \
368 -fomit-frame-pointer
-std
=gnu89
$(HOST_LFS_CFLAGS
)
369 HOSTCXXFLAGS
:= -O2
$(HOST_LFS_CFLAGS
)
370 HOSTLDFLAGS
:= $(HOST_LFS_LDFLAGS
)
371 HOST_LOADLIBES
:= $(HOST_LFS_LIBS
)
373 # Make variables (CC, etc...)
374 AS
= $(CROSS_COMPILE
)as
375 LD
= $(CROSS_COMPILE
)ld
376 LDGOLD
= $(CROSS_COMPILE
)ld.gold
377 CC
= $(CROSS_COMPILE
)gcc
379 AR
= $(CROSS_COMPILE
)ar
380 NM
= $(CROSS_COMPILE
)nm
381 STRIP
= $(CROSS_COMPILE
)strip
382 OBJCOPY
= $(CROSS_COMPILE
)objcopy
383 OBJDUMP
= $(CROSS_COMPILE
)objdump
385 GENKSYMS
= scripts
/genksyms
/genksyms
386 INSTALLKERNEL
:= installkernel
387 DEPMOD
= /sbin
/depmod
392 ifeq ($(CONFIG_EXYNOS_FMP_FIPS
),)
393 READELF
= $(CROSS_COMPILE
)readelf
397 CHECKFLAGS
:= -D__linux__
-Dlinux
-D__STDC__
-Dunix
-D__unix__ \
398 -Wbitwise
-Wno-return-void
$(CF
)
407 # Use USERINCLUDE when you must reference the UAPI directories only.
409 -I
$(srctree
)/arch
/$(hdr-arch
)/include/uapi \
410 -I
$(objtree
)/arch
/$(hdr-arch
)/include/generated
/uapi \
411 -I
$(srctree
)/include/uapi \
412 -I
$(objtree
)/include/generated
/uapi \
413 -include $(srctree
)/include/linux
/kconfig.h
415 # Use LINUXINCLUDE when you must reference the include/ directory.
416 # Needed to be compatible with the O= option
418 -I
$(srctree
)/arch
/$(hdr-arch
)/include \
419 -I
$(objtree
)/arch
/$(hdr-arch
)/include/generated \
420 $(if
$(KBUILD_SRC
), -I
$(srctree
)/include) \
421 -I
$(objtree
)/include \
424 KBUILD_AFLAGS
:= -D__ASSEMBLY__
425 KBUILD_CFLAGS
:= -Wall
-Wundef
-Wstrict-prototypes
-Wno-trigraphs \
426 -fno-strict-aliasing
-fno-common
-fshort-wchar \
427 -Werror-implicit-function-declaration \
428 -Wno-format-security \
431 KBUILD_CPPFLAGS
:= -D__KERNEL__
432 KBUILD_AFLAGS_KERNEL
:=
433 KBUILD_CFLAGS_KERNEL
:=
434 KBUILD_AFLAGS_MODULE
:= -DMODULE
435 KBUILD_CFLAGS_MODULE
:= -DMODULE
436 KBUILD_LDFLAGS_MODULE
:= -T
$(srctree
)/scripts
/module-common.lds
437 GCC_PLUGINS_CFLAGS
:=
439 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
440 export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
441 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
442 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
444 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
445 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
446 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
447 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
448 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
449 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
450 export KBUILD_ARFLAGS
452 # When compiling out-of-tree modules, put MODVERDIR in the module
453 # tree rather than in the kernel tree. The kernel tree might
455 export MODVERDIR
:= $(if
$(KBUILD_EXTMOD
),$(firstword $(KBUILD_EXTMOD
))/).tmp_versions
457 # Files to ignore in find ... statements
459 export RCS_FIND_IGNORE
:= \
( -name SCCS
-o
-name BitKeeper
-o
-name .svn
-o \
460 -name CVS
-o
-name .
pc -o
-name .hg
-o
-name .git \
) \
462 export RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn \
463 --exclude CVS
--exclude .
pc --exclude .hg
--exclude .git
465 # ===========================================================================
466 # Rules shared between *config targets and build targets
468 # Basic helpers built in scripts/basic/
469 PHONY
+= scripts_basic
471 $(Q
)$(MAKE
) $(build
)=scripts
/basic
472 $(Q
)rm -f .tmp_quiet_recordmcount
474 # To avoid any implicit rule to kick in, define an empty command.
475 scripts
/basic
/%: scripts_basic
;
477 PHONY
+= outputmakefile
478 # outputmakefile generates a Makefile in the output directory, if using a
479 # separate output directory. This allows convenient use of make in the
482 ifneq ($(KBUILD_SRC
),)
483 $(Q
)ln
-fsn
$(srctree
) source
484 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/mkmakefile \
485 $(srctree
) $(objtree
) $(VERSION
) $(PATCHLEVEL
)
488 ifeq ($(cc-name
),clang
)
489 ifneq ($(CROSS_COMPILE
),)
490 CLANG_TRIPLE ?
= $(CROSS_COMPILE
)
491 CLANG_FLAGS
:= --target
=$(notdir $(CLANG_TRIPLE
:%-=%))
492 GCC_TOOLCHAIN_DIR
:= $(dir $(shell which
$(CROSS_COMPILE
)elfedit
))
493 CLANG_FLAGS
+= --prefix=$(GCC_TOOLCHAIN_DIR
)
494 GCC_TOOLCHAIN
:= $(realpath
$(GCC_TOOLCHAIN_DIR
)/..
)
496 ifneq ($(GCC_TOOLCHAIN
),)
497 CLANG_FLAGS
+= --gcc-toolchain
=$(GCC_TOOLCHAIN
)
499 CLANG_FLAGS
+= -no-integrated-as
500 KBUILD_CFLAGS
+= $(CLANG_FLAGS
)
501 KBUILD_AFLAGS
+= $(CLANG_FLAGS
)
505 RETPOLINE_CFLAGS_GCC
:= -mindirect-branch
=thunk-extern
-mindirect-branch-register
506 RETPOLINE_VDSO_CFLAGS_GCC
:= -mindirect-branch
=thunk-inline
-mindirect-branch-register
507 RETPOLINE_CFLAGS_CLANG
:= -mretpoline-external-thunk
508 RETPOLINE_VDSO_CFLAGS_CLANG
:= -mretpoline
509 RETPOLINE_CFLAGS
:= $(call cc-option
,$(RETPOLINE_CFLAGS_GCC
),$(call cc-option
,$(RETPOLINE_CFLAGS_CLANG
)))
510 RETPOLINE_VDSO_CFLAGS
:= $(call cc-option
,$(RETPOLINE_VDSO_CFLAGS_GCC
),$(call cc-option
,$(RETPOLINE_VDSO_CFLAGS_CLANG
)))
511 export RETPOLINE_CFLAGS
512 export RETPOLINE_VDSO_CFLAGS
514 ifeq ($(config-targets
),1)
515 # ===========================================================================
516 # *config targets only - make sure prerequisites are updated, and descend
517 # in scripts/kconfig to make the *config target
519 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
520 # KBUILD_DEFCONFIG may point out an alternative default configuration
521 # used for 'make defconfig'
522 include arch
/$(SRCARCH
)/Makefile
523 export KBUILD_DEFCONFIG KBUILD_KCONFIG
525 config
: scripts_basic outputmakefile FORCE
526 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
528 %config
: scripts_basic outputmakefile FORCE
529 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
532 # ===========================================================================
533 # Build targets only - this includes vmlinux, arch specific targets, clean
534 # targets and others. In general all targets except *config targets.
536 # If building an external module we do not care about the all: rule
537 # but instead _all depend on modules
539 ifeq ($(KBUILD_EXTMOD
),)
545 # Decide whether to build built-in, modular, or both.
546 # Normally, just do built-in.
551 # If we have only "make modules", don't compile built-in objects.
552 # When we're building modules with modversions, we need to consider
553 # the built-in objects during the descend as well, in order to
554 # make sure the checksums are up to date before we record them.
556 ifeq ($(MAKECMDGOALS
),modules
)
557 KBUILD_BUILTIN
:= $(if
$(CONFIG_MODVERSIONS
),1)
560 # If we have "make <whatever> modules", compile modules
561 # in addition to whatever we do anyway.
562 # Just "make" or "make all" shall build modules as well
564 ifneq ($(filter all _all modules
,$(MAKECMDGOALS
)),)
568 ifeq ($(MAKECMDGOALS
),)
572 export KBUILD_MODULES KBUILD_BUILTIN
574 ifeq ($(KBUILD_EXTMOD
),)
575 # Additional helpers built in scripts/
576 # Carefully list dependencies so we do not try to build scripts twice
579 scripts
: scripts_basic
include/config
/auto.conf
include/config
/tristate.conf \
580 asm-generic gcc-plugins
581 $(Q
)$(MAKE
) $(build
)=$(@
)
583 # Objects we will link into vmlinux / subdirs we need to visit
585 drivers-y
:= drivers
/ sound
/ firmware
/
590 endif # KBUILD_EXTMOD
592 ifeq ($(dot-config
),1)
594 -include include/config
/auto.conf
596 ifeq ($(KBUILD_EXTMOD
),)
597 # Read in dependencies to all Kconfig* files, make sure to run
598 # oldconfig if changes are detected.
599 -include include/config
/auto.conf.cmd
601 # To avoid any implicit rule to kick in, define an empty command
602 $(KCONFIG_CONFIG
) include/config
/auto.conf.cmd
: ;
604 # If .config is newer than include/config/auto.conf, someone tinkered
605 # with it and forgot to run make oldconfig.
606 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
607 # we execute the config step to be sure to catch updated Kconfig files
608 include/config
/%.conf
: $(KCONFIG_CONFIG
) include/config
/auto.conf.cmd
609 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile silentoldconfig
611 # external modules needs include/generated/autoconf.h and include/config/auto.conf
612 # but do not care if they are up-to-date. Use auto.conf to trigger the test
613 PHONY
+= include/config
/auto.conf
615 include/config
/auto.conf
:
616 $(Q
)test -e
include/generated
/autoconf.h
-a
-e
$@ ||
( \
618 echo
>&2 " ERROR: Kernel configuration is invalid."; \
619 echo
>&2 " include/generated/autoconf.h or $@ are missing.";\
620 echo
>&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
624 endif # KBUILD_EXTMOD
627 # Dummy target needed, because used as prerequisite
628 include/config
/auto.conf
: ;
629 endif # $(dot-config)
631 # For the kernel to actually contain only the needed exported symbols,
632 # we have to build modules as well to determine what those symbols are.
633 # (this can be evaluated only once include/config/auto.conf has been included)
634 ifdef CONFIG_TRIM_UNUSED_KSYMS
638 # The all: target is the default when no target is given on the
640 # This allow a user to issue only 'make' to build a kernel including modules
641 # Defaults to vmlinux, but the arch makefile usually adds further targets
649 KBUILD_CFLAGS
+= $(call cc-option
,-fno-PIE
)
650 KBUILD_AFLAGS
+= $(call cc-option
,-fno-PIE
)
651 CFLAGS_GCOV
:= -fprofile-arcs
-ftest-coverage
-fno-tree-loop-im
$(call cc-disable-warning
,maybe-uninitialized
,)
652 CFLAGS_KCOV
:= $(call cc-option
,-fsanitize-coverage
=trace-pc
,)
653 export CFLAGS_GCOV CFLAGS_KCOV
655 # Make toolchain changes before including arch/$(SRCARCH)/Makefile to ensure
656 # ar/cc/ld-* macros return correct values.
657 ifdef CONFIG_LTO_CLANG
658 # use GNU gold with LLVMgold for LTO linking, and LD for vmlinux_link
659 LDFINAL_vmlinux
:= $(LD
)
661 LDFLAGS
+= -plugin
$(LTO_LLVM_LIB_BASE
)LLVMgold.so
662 # use llvm-ar for building symbol tables from IR files, and llvm-dis instead
663 # of objdump for processing symbol versions and exports
666 export LLVM_AR LLVM_DIS
669 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
670 # values of the respective KBUILD_* variables
674 include arch
/$(SRCARCH
)/Makefile
676 KBUILD_CFLAGS
+= $(call cc-option
,-fno-delete-null-pointer-checks
,)
677 KBUILD_CFLAGS
+= $(call cc-disable-warning
,frame-address
,)
678 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-truncation
)
679 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-overflow
)
680 KBUILD_CFLAGS
+= $(call cc-disable-warning
, int-in-bool-context
)
681 KBUILD_CFLAGS
+= $(call cc-disable-warning
, attribute-alias
)
683 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
684 KBUILD_CFLAGS
+= $(call cc-option
,-Oz
,-Os
)
685 KBUILD_CFLAGS
+= $(call cc-disable-warning
,maybe-uninitialized
,)
687 ifdef CONFIG_PROFILE_ALL_BRANCHES
688 KBUILD_CFLAGS
+= -O2
$(call cc-disable-warning
,maybe-uninitialized
,)
694 KBUILD_CFLAGS
+= $(call cc-ifversion
, -lt
, 0409, \
695 $(call cc-disable-warning
,maybe-uninitialized
,))
697 # Tell gcc to never replace conditional load with a non-conditional one
698 KBUILD_CFLAGS
+= $(call cc-option
,--param
=allow-store-data-races
=0)
700 # check for 'asm goto'
701 ifeq ($(shell $(CONFIG_SHELL
) $(srctree
)/scripts
/gcc-goto.sh
$(CC
) $(KBUILD_CFLAGS
)), y
)
702 KBUILD_CFLAGS
+= -DCC_HAVE_ASM_GOTO
703 KBUILD_AFLAGS
+= -DCC_HAVE_ASM_GOTO
706 include scripts
/Makefile.gcc-plugins
708 ifdef CONFIG_READABLE_ASM
709 # Disable optimizations that make assembler listings hard to read.
710 # reorder blocks reorders the control in the function
711 # ipa clone creates specialized cloned functions
712 # partial inlining inlines only parts of functions
713 KBUILD_CFLAGS
+= $(call cc-option
,-fno-reorder-blocks
,) \
714 $(call cc-option
,-fno-ipa-cp-clone
,) \
715 $(call cc-option
,-fno-partial-inlining
)
718 ifneq ($(CONFIG_FRAME_WARN
),0)
719 KBUILD_CFLAGS
+= $(call cc-option
,-Wframe-larger-than
=${CONFIG_FRAME_WARN})
722 # This selects the stack protector compiler flag. Testing it is delayed
723 # until after .config has been reprocessed, in the prepare-compiler-check
725 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
726 stackp-flag
:= -fstack-protector
727 stackp-name
:= REGULAR
729 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
730 stackp-flag
:= -fstack-protector-strong
731 stackp-name
:= STRONG
733 # Force off for distro compilers that enable stack protector by default.
734 stackp-flag
:= $(call cc-option
, -fno-stack-protector
)
737 # Find arch-specific stack protector compiler sanity-checking script.
738 ifdef CONFIG_CC_STACKPROTECTOR
739 stackp-path
:= $(srctree
)/scripts
/gcc-
$(SRCARCH
)_
$(BITS
)-has-stack-protector.sh
740 stackp-check
:= $(wildcard $(stackp-path
))
742 KBUILD_CFLAGS
+= $(stackp-flag
)
744 ifeq ($(cc-name
),clang
)
745 KBUILD_CPPFLAGS
+= $(call cc-option
,-Qunused-arguments
,)
746 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-invalid-specifier
)
747 KBUILD_CFLAGS
+= $(call cc-disable-warning
, gnu
)
748 KBUILD_CFLAGS
+= $(call cc-disable-warning
, address-of-packed-member
)
749 KBUILD_CFLAGS
+= $(call cc-disable-warning
, duplicate-decl-specifier
)
750 # Quiet clang warning: comparison of unsigned expression < 0 is always false
751 KBUILD_CFLAGS
+= $(call cc-disable-warning
, tautological-compare
)
752 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
753 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
754 # See modpost pattern 2
755 KBUILD_CFLAGS
+= $(call cc-option
, -mno-global-merge
,)
756 KBUILD_CFLAGS
+= $(call cc-option
, -fcatch-undefined-behavior
)
759 # These warnings generated too much noise in a regular build.
760 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
761 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-but-set-variable
)
764 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-const-variable
)
765 ifdef CONFIG_FRAME_POINTER
766 KBUILD_CFLAGS
+= -fno-omit-frame-pointer
-fno-optimize-sibling-calls
768 # Some targets (ARM with Thumb2, for example), can't be built with frame
769 # pointers. For those, we don't have FUNCTION_TRACER automatically
770 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
771 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
772 # -fomit-frame-pointer with FUNCTION_TRACER.
773 ifndef CONFIG_FUNCTION_TRACER
774 KBUILD_CFLAGS
+= -fomit-frame-pointer
778 KBUILD_CFLAGS
+= $(call cc-option
, -fno-var-tracking-assignments
)
780 ifdef CONFIG_DEBUG_INFO
781 ifdef CONFIG_DEBUG_INFO_SPLIT
782 KBUILD_CFLAGS
+= $(call cc-option
, -gsplit-dwarf
, -g
)
786 KBUILD_AFLAGS
+= -Wa
,-gdwarf-2
788 ifdef CONFIG_DEBUG_INFO_DWARF4
789 KBUILD_CFLAGS
+= $(call cc-option
, -gdwarf-4
,)
792 ifdef CONFIG_DEBUG_INFO_REDUCED
793 KBUILD_CFLAGS
+= $(call cc-option
, -femit-struct-debug-baseonly
) \
794 $(call cc-option
,-fno-var-tracking
)
797 ifdef CONFIG_FUNCTION_TRACER
798 ifndef CC_FLAGS_FTRACE
799 CC_FLAGS_FTRACE
:= -pg
801 export CC_FLAGS_FTRACE
802 ifdef CONFIG_HAVE_FENTRY
803 CC_USING_FENTRY
:= $(call cc-option
, -mfentry
-DCC_USING_FENTRY
)
805 KBUILD_CFLAGS
+= $(CC_FLAGS_FTRACE
) $(CC_USING_FENTRY
)
806 KBUILD_AFLAGS
+= $(CC_USING_FENTRY
)
807 ifdef CONFIG_DYNAMIC_FTRACE
808 ifdef CONFIG_HAVE_C_RECORDMCOUNT
809 BUILD_C_RECORDMCOUNT
:= y
810 export BUILD_C_RECORDMCOUNT
815 # We trigger additional mismatches with less inlining
816 ifdef CONFIG_DEBUG_SECTION_MISMATCH
817 KBUILD_CFLAGS
+= $(call cc-option
, -fno-inline-functions-called-once
)
820 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
821 KBUILD_CFLAGS
+= $(call cc-option
,-ffunction-sections
,)
822 KBUILD_CFLAGS
+= $(call cc-option
,-fdata-sections
,)
825 ifdef CONFIG_LTO_CLANG
826 lto-clang-flags
:= -flto
-fvisibility
=hidden
828 # allow disabling only clang LTO where needed
829 DISABLE_LTO_CLANG
:= -fno-lto
-fvisibility
=default
830 export DISABLE_LTO_CLANG
834 lto-flags
:= $(lto-clang-flags
)
835 KBUILD_CFLAGS
+= $(lto-flags
)
837 DISABLE_LTO
:= $(DISABLE_LTO_CLANG
)
840 # LDFINAL_vmlinux and LDFLAGS_FINAL_vmlinux can be set to override
841 # the linker and flags for vmlinux_link.
842 export LDFINAL_vmlinux LDFLAGS_FINAL_vmlinux
845 ifdef CONFIG_CFI_CLANG
846 cfi-clang-flags
+= -fsanitize
=cfi
847 DISABLE_CFI_CLANG
:= -fno-sanitize
=cfi
849 cfi-clang-flags
+= -fsanitize-cfi-cross-dso
850 DISABLE_CFI_CLANG
+= -fno-sanitize-cfi-cross-dso
852 ifdef CONFIG_CFI_PERMISSIVE
853 cfi-clang-flags
+= -fsanitize-recover
=cfi
-fno-sanitize-trap
=cfi
856 # also disable CFI when LTO is disabled
857 DISABLE_LTO_CLANG
+= $(DISABLE_CFI_CLANG
)
858 # allow disabling only clang CFI where needed
859 export DISABLE_CFI_CLANG
863 # cfi-flags are re-tested in prepare-compiler-check
864 cfi-flags
:= $(cfi-clang-flags
)
865 KBUILD_CFLAGS
+= $(cfi-flags
)
867 DISABLE_CFI
:= $(DISABLE_CFI_CLANG
)
868 DISABLE_LTO
+= $(DISABLE_CFI
)
872 # arch Makefile may override CC so keep this after arch Makefile is included
873 NOSTDINC_FLAGS
+= -nostdinc
-isystem
$(shell $(CC
) -print-file-name
=include)
874 CHECKFLAGS
+= $(NOSTDINC_FLAGS
)
876 # warn about C99 declaration after statement
877 KBUILD_CFLAGS
+= $(call cc-option
,-Wdeclaration-after-statement
,)
879 # disable pointer signed / unsigned warnings in gcc 4.0
880 KBUILD_CFLAGS
+= $(call cc-disable-warning
, pointer-sign
)
882 # disable stringop warnings in gcc 8+
883 KBUILD_CFLAGS
+= $(call cc-disable-warning
, stringop-truncation
)
885 # disable invalid "can't wrap" optimizations for signed / pointers
886 KBUILD_CFLAGS
+= $(call cc-option
,-fno-strict-overflow
)
888 # clang sets -fmerge-all-constants by default as optimization, but this
889 # is non-conforming behavior for C and in fact breaks the kernel, so we
890 # need to disable it here generally.
891 KBUILD_CFLAGS
+= $(call cc-option
,-fno-merge-all-constants
)
893 # for gcc -fno-merge-all-constants disables everything, but it is fine
894 # to have actual conforming behavior enabled.
895 KBUILD_CFLAGS
+= $(call cc-option
,-fmerge-constants
)
897 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
898 KBUILD_CFLAGS
+= $(call cc-option
,-fno-stack-check
,)
900 # conserve stack if available
901 KBUILD_CFLAGS
+= $(call cc-option
,-fconserve-stack
)
903 # disallow errors like 'EXPORT_GPL(foo);' with missing header
904 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=implicit-int
)
906 # require functions to have arguments in prototypes, not empty 'int foo()'
907 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=strict-prototypes
)
909 # Prohibit date/time macros, which would make the build non-deterministic
910 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=date-time
)
912 # enforce correct pointer usage
913 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=incompatible-pointer-types
)
915 # Require designated initializers for all marked structures
916 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=designated-init
)
918 # use the deterministic mode of AR if available
919 KBUILD_ARFLAGS
:= $(call ar-option
,D
)
921 include scripts
/Makefile.kasan
922 include scripts
/Makefile.extrawarn
923 include scripts
/Makefile.ubsan
925 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
927 KBUILD_CPPFLAGS
+= $(ARCH_CPPFLAGS
) $(KCPPFLAGS
)
928 KBUILD_AFLAGS
+= $(ARCH_AFLAGS
) $(KAFLAGS
)
929 KBUILD_CFLAGS
+= $(ARCH_CFLAGS
) $(KCFLAGS
)
931 # Use --build-id when available.
932 LDFLAGS_BUILD_ID
:= $(patsubst -Wl
$(comma
)%,%,\
933 $(call cc-ldoption
, -Wl
$(comma
)--build-id
,))
934 KBUILD_LDFLAGS_MODULE
+= $(LDFLAGS_BUILD_ID
)
935 LDFLAGS_vmlinux
+= $(LDFLAGS_BUILD_ID
)
937 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
938 LDFLAGS_vmlinux
+= $(call ld-option
, --gc-sections
,)
941 ifeq ($(CONFIG_STRIP_ASM_SYMS
),y
)
942 LDFLAGS_vmlinux
+= $(call ld-option
, -X
,)
945 # Default kernel image to build when no specific target is given.
946 # KBUILD_IMAGE may be overruled on the command line or
947 # set in the environment
948 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
950 export KBUILD_IMAGE ?
= vmlinux
953 # INSTALL_PATH specifies where to place the updated kernel and system map
954 # images. Default is /boot, but you can set it to other values
955 export INSTALL_PATH ?
= /boot
958 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
959 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
960 # an argument if needed. Otherwise it defaults to the kernel install path
962 export INSTALL_DTBS_PATH ?
= $(INSTALL_PATH
)/dtbs
/$(KERNELRELEASE
)
965 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
966 # relocations required by build roots. This is not defined in the
967 # makefile but the argument can be passed to make if needed.
970 MODLIB
= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
974 # INSTALL_MOD_STRIP, if defined, will cause modules to be
975 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
976 # the default option --strip-debug will be used. Otherwise,
977 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
979 ifdef INSTALL_MOD_STRIP
980 ifeq ($(INSTALL_MOD_STRIP
),1)
981 mod_strip_cmd
= $(STRIP
) --strip-debug
983 mod_strip_cmd
= $(STRIP
) $(INSTALL_MOD_STRIP
)
984 endif # INSTALL_MOD_STRIP=1
987 endif # INSTALL_MOD_STRIP
990 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
991 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
992 # or CONFIG_MODULE_COMPRESS_XZ.
994 mod_compress_cmd
= true
995 ifdef CONFIG_MODULE_COMPRESS
996 ifdef CONFIG_MODULE_COMPRESS_GZIP
997 mod_compress_cmd
= gzip
-n
-f
998 endif # CONFIG_MODULE_COMPRESS_GZIP
999 ifdef CONFIG_MODULE_COMPRESS_XZ
1000 mod_compress_cmd
= xz
-f
1001 endif # CONFIG_MODULE_COMPRESS_XZ
1002 endif # CONFIG_MODULE_COMPRESS
1003 export mod_compress_cmd
1005 # Select initial ramdisk compression format, default is gzip(1).
1006 # This shall be used by the dracut(8) tool while creating an initramfs image.
1008 INITRD_COMPRESS-y
:= gzip
1009 INITRD_COMPRESS-
$(CONFIG_RD_BZIP2
) := bzip2
1010 INITRD_COMPRESS-
$(CONFIG_RD_LZMA
) := lzma
1011 INITRD_COMPRESS-
$(CONFIG_RD_XZ
) := xz
1012 INITRD_COMPRESS-
$(CONFIG_RD_LZO
) := lzo
1013 INITRD_COMPRESS-
$(CONFIG_RD_LZ4
) := lz4
1014 # do not export INITRD_COMPRESS, since we didn't actually
1015 # choose a sane default compression above.
1016 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
1018 ifdef CONFIG_MODULE_SIG_ALL
1019 $(eval
$(call config_filename
,MODULE_SIG_KEY
))
1021 mod_sign_cmd
= scripts
/sign-file
$(CONFIG_MODULE_SIG_HASH
) $(MODULE_SIG_KEY_SRCPREFIX
)$(CONFIG_MODULE_SIG_KEY
) certs
/signing_key.x509
1027 ifdef CONFIG_STACK_VALIDATION
1028 has_libelf
:= $(call try-run
,\
1029 echo
"int main() {}" |
$(HOSTCC
) -xc
-o
/dev
/null
-lelf
-,1,0)
1030 ifeq ($(has_libelf
),1)
1031 objtool_target
:= tools
/objtool FORCE
1033 SKIP_STACK_VALIDATION
:= 1
1034 export SKIP_STACK_VALIDATION
1039 ifeq ($(KBUILD_EXTMOD
),)
1040 core-y
+= kernel
/ certs
/ mm
/ fs
/ ipc
/ security
/ crypto
/ block
/
1042 vmlinux-dirs
:= $(patsubst %/,%,$(filter %/, $(init-y
) $(init-m
) \
1043 $(core-y
) $(core-m
) $(drivers-y
) $(drivers-m
) \
1044 $(net-y
) $(net-m
) $(libs-y
) $(libs-m
) $(virt-y
)))
1046 vmlinux-alldirs
:= $(sort $(vmlinux-dirs
) $(patsubst %/,%,$(filter %/, \
1047 $(init-
) $(core-
) $(drivers-
) $(net-
) $(libs-
) $(virt-
))))
1049 init-y
:= $(patsubst %/, %/built-in.o
, $(init-y
))
1050 core-y
:= $(patsubst %/, %/built-in.o
, $(core-y
))
1051 drivers-y
:= $(patsubst %/, %/built-in.o
, $(drivers-y
))
1052 net-y
:= $(patsubst %/, %/built-in.o
, $(net-y
))
1053 libs-y1
:= $(patsubst %/, %/lib.a
, $(libs-y
))
1054 libs-y2
:= $(filter-out %.a
, $(patsubst %/, %/built-in.o
, $(libs-y
)))
1055 virt-y
:= $(patsubst %/, %/built-in.o
, $(virt-y
))
1057 # Externally visible symbols (used by link-vmlinux.sh)
1058 export KBUILD_VMLINUX_INIT
:= $(head-y
) $(init-y
)
1059 export KBUILD_VMLINUX_MAIN
:= $(core-y
) $(libs-y2
) $(drivers-y
) $(net-y
) $(virt-y
)
1060 export KBUILD_VMLINUX_LIBS
:= $(libs-y1
)
1061 export KBUILD_LDS
:= arch
/$(SRCARCH
)/kernel
/vmlinux.lds
1062 export LDFLAGS_vmlinux
1063 # used by scripts/package/Makefile
1064 export KBUILD_ALLDIRS
:= $(sort $(filter-out arch
/%,$(vmlinux-alldirs
)) arch Documentation
include samples scripts tools
)
1066 vmlinux-deps
:= $(KBUILD_LDS
) $(KBUILD_VMLINUX_INIT
) $(KBUILD_VMLINUX_MAIN
) $(KBUILD_VMLINUX_LIBS
)
1068 # Include targets which we want to execute sequentially if the rest of the
1069 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
1070 # evaluated more than once.
1071 PHONY
+= vmlinux_prereq
1072 vmlinux_prereq
: $(vmlinux-deps
) FORCE
1073 ifdef CONFIG_HEADERS_CHECK
1074 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile headers_check
1076 ifdef CONFIG_GDB_SCRIPTS
1077 $(Q
)ln
-fsn
$(abspath
$(srctree
)/scripts
/gdb
/vmlinux-gdb.py
)
1079 ifdef CONFIG_TRIM_UNUSED_KSYMS
1080 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/adjust_autoksyms.sh \
1081 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1084 # standalone target for easier testing
1085 include/generated
/autoksyms.h
: FORCE
1086 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/adjust_autoksyms.sh true
1088 ARCH_POSTLINK
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/Makefile.postlink
)
1090 # Final link of vmlinux with optional arch pass after final link
1091 cmd_link-vmlinux
= \
1092 $(CONFIG_SHELL
) $< $(LD
) $(LDFLAGS
) $(LDFLAGS_vmlinux
) ; \
1093 $(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) $@
, true
)
1095 vmlinux
: scripts
/link-vmlinux.sh vmlinux_prereq
$(vmlinux-deps
) FORCE
1096 +$(call if_changed
,link-vmlinux
)
1098 # Build samples along the rest of the kernel
1099 ifdef CONFIG_SAMPLES
1100 vmlinux-dirs
+= samples
1103 # The actual objects are generated when descending,
1104 # make sure no implicit rule kicks in
1105 $(sort $(vmlinux-deps
)): $(vmlinux-dirs
) ;
1107 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1108 # Preset locale variables to speed up the build process. Limit locale
1109 # tweaks to this spot to avoid wrong language settings when running
1110 # make menuconfig etc.
1111 # Error messages still appears in the original language
1113 PHONY
+= $(vmlinux-dirs
)
1114 $(vmlinux-dirs
): prepare scripts
1115 $(Q
)$(MAKE
) $(build
)=$@
1117 define filechk_kernel.release
1118 echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1121 # Store (new) KERNELRELEASE string in include/config/kernel.release
1122 include/config
/kernel.release
: include/config
/auto.conf FORCE
1123 $(call filechk
,kernel.release
)
1126 # Things we need to do before we recursively start building the kernel
1127 # or the modules are listed in "prepare".
1128 # A multi level approach is used. prepareN is processed before prepareN-1.
1129 # archprepare is used in arch Makefiles and when processed asm symlink,
1130 # version.h and scripts_basic is processed / created.
1132 # Listed in dependency order
1133 PHONY
+= prepare archprepare prepare0 prepare1 prepare2 prepare3
1135 # prepare3 is used to check if we are building in a separate output directory,
1137 # 1) Check that make has not been executed in the kernel src $(srctree)
1138 prepare3
: include/config
/kernel.release
1139 ifneq ($(KBUILD_SRC
),)
1140 @
$(kecho
) ' Using $(srctree) as source for kernel'
1141 $(Q
)if
[ -f
$(srctree
)/.config
-o
-d
$(srctree
)/include/config
]; then \
1142 echo
>&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1143 echo
>&2 " in the '$(srctree)' directory.";\
1148 # prepare2 creates a makefile if using a separate output directory.
1149 # From this point forward, .config has been reprocessed, so any rules
1150 # that need to depend on updated CONFIG_* values can be checked here.
1151 prepare2
: prepare3 prepare-compiler-check outputmakefile asm-generic
1153 prepare1
: prepare2
$(version_h
) include/generated
/utsrelease.h \
1154 include/config
/auto.conf
1157 archprepare
: archheaders archscripts prepare1 scripts_basic
1159 prepare0
: archprepare gcc-plugins
1160 $(Q
)$(MAKE
) $(build
)=.
1162 # All the preparing..
1163 prepare
: prepare0 prepare-objtool
1165 # Support for using generic headers in asm-generic
1166 PHONY
+= asm-generic uapi-asm-generic
1167 asm-generic
: uapi-asm-generic
1168 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.asm-generic \
1169 src
=asm obj
=arch
/$(SRCARCH
)/include/generated
/asm
1171 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.asm-generic \
1172 src
=uapi
/asm obj
=arch
/$(SRCARCH
)/include/generated
/uapi
/asm
1174 PHONY
+= prepare-objtool
1175 prepare-objtool
: $(objtool_target
)
1176 ifeq ($(SKIP_STACK_VALIDATION
),1)
1177 ifdef CONFIG_UNWINDER_ORC
1178 @echo
"error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1181 @echo
"warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1185 # Check for CONFIG flags that require compiler support. Abort the build
1186 # after .config has been processed, but before the kernel build starts.
1188 # For security-sensitive CONFIG options, we don't want to fallback and/or
1189 # silently change which compiler flags will be used, since that leads to
1190 # producing kernels with different security feature characteristics
1191 # depending on the compiler used. (For example, "But I selected
1192 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1193 PHONY
+= prepare-compiler-check
1194 prepare-compiler-check
: FORCE
1195 # Make sure we're using a supported toolchain with LTO_CLANG
1196 ifdef CONFIG_LTO_CLANG
1197 ifneq ($(call clang-ifversion
, -ge
, 0500, y
), y
)
1198 @echo Cannot use CONFIG_LTO_CLANG
: requires clang
5.0 or later
>&2 && exit
1
1200 ifneq ($(call gold-ifversion
, -ge
, 112000000, y
), y
)
1201 @echo Cannot use CONFIG_LTO_CLANG
: requires GNU gold
1.12 or later
>&2 && exit
1
1204 # Make sure compiler supports LTO flags
1206 ifeq ($(call cc-option
, $(lto-flags
)),)
1207 @echo Cannot use CONFIG_LTO
: $(lto-flags
) not supported by compiler \
1211 # Make sure compiler supports requested stack protector flag.
1213 ifeq ($(call cc-option
, $(stackp-flag
)),)
1214 @echo Cannot use CONFIG_CC_STACKPROTECTOR_
$(stackp-name
): \
1215 $(stackp-flag
) not supported by compiler
>&2 && exit
1
1218 # Make sure compiler does not have buggy stack-protector support.
1220 ifneq ($(shell $(CONFIG_SHELL
) $(stackp-check
) $(CC
) $(KBUILD_CPPFLAGS
) $(biarch
)),y
)
1221 @echo Cannot use CONFIG_CC_STACKPROTECTOR_
$(stackp-name
): \
1222 $(stackp-flag
) available but compiler is broken
>&2 && exit
1
1226 ifeq ($(call cc-option
, $(cfi-flags
)),)
1227 @echo Cannot use CONFIG_CFI
: $(cfi-flags
) not supported by compiler
>&2 && exit
1
1232 # Generate some files
1233 # ---------------------------------------------------------------------------
1235 # KERNELRELEASE can change from a few different places, meaning version.h
1236 # needs to be updated, so this check is forced on all builds
1239 define filechk_utsrelease.h
1240 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
1241 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1244 (echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1247 define filechk_version.h
1248 (echo \
#define LINUX_VERSION_CODE $(shell \
1249 expr
$(VERSION
) \
* 65536 + 0$(PATCHLEVEL
) \
* 256 + 0$(SUBLEVEL
)); \
1250 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1253 $(version_h
): $(srctree
)/Makefile FORCE
1254 $(call filechk
,version.h
)
1255 $(Q
)rm -f
$(old_version_h
)
1257 include/generated
/utsrelease.h
: include/config
/kernel.release FORCE
1258 $(call filechk
,utsrelease.h
)
1262 $(Q
)find
$(srctree
)/include/ -name
'*.h' | xargs
--max-args
1 \
1263 $(srctree
)/scripts
/headerdep.pl
-I
$(srctree
)/include
1265 # ---------------------------------------------------------------------------
1268 #Default location for installed headers
1269 export INSTALL_HDR_PATH
= $(objtree
)/usr
1271 # If we do an all arch process set dst to include/arch-$(hdr-arch)
1272 hdr-dst
= $(if
$(KBUILD_HEADERS
), dst
=include/arch-
$(hdr-arch
), dst
=include)
1274 PHONY
+= archheaders
1277 PHONY
+= archscripts
1281 __headers
: $(version_h
) scripts_basic uapi-asm-generic archheaders archscripts
1282 $(Q
)$(MAKE
) $(build
)=scripts build_unifdef
1284 PHONY
+= headers_install_all
1285 headers_install_all
:
1286 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
install
1288 PHONY
+= headers_install
1289 headers_install
: __headers
1290 $(if
$(wildcard $(srctree
)/arch
/$(hdr-arch
)/include/uapi
/asm
/Kbuild
),, \
1291 $(error Headers not exportable for the
$(SRCARCH
) architecture
))
1292 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi dst
=include
1293 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(hdr-arch
)/include/uapi
$(hdr-dst
)
1295 PHONY
+= headers_check_all
1296 headers_check_all
: headers_install_all
1297 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
check
1299 PHONY
+= headers_check
1300 headers_check
: headers_install
1301 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi dst
=include HDRCHECK
=1
1302 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(hdr-arch
)/include/uapi
$(hdr-dst
) HDRCHECK
=1
1304 # ---------------------------------------------------------------------------
1309 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests run_tests
1311 PHONY
+= kselftest-clean
1313 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests
clean
1315 PHONY
+= kselftest-merge
1317 $(if
$(wildcard $(objtree
)/.config
),, $(error No .config exists
, config your kernel first
!))
1318 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/kconfig
/merge_config.sh \
1319 -m
$(objtree
)/.config \
1320 $(srctree
)/tools
/testing
/selftests
/*/config
1321 +$(Q
)$(MAKE
) -f
$(srctree
)/Makefile olddefconfig
1323 # ---------------------------------------------------------------------------
1326 ifdef CONFIG_MODULES
1328 # By default, build modules as well
1334 # A module can be listed more than once in obj-m resulting in
1335 # duplicate lines in modules.order files. Those are removed
1336 # using awk while concatenating to the final file.
1339 modules
: $(vmlinux-dirs
) $(if
$(KBUILD_BUILTIN
),vmlinux
) modules.builtin
1340 $(Q
)$(AWK
) '!x[$$0]++' $(vmlinux-dirs
:%=$(objtree
)/%/modules.order
) > $(objtree
)/modules.order
1341 @
$(kecho
) ' Building modules, stage 2.';
1342 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1344 modules.builtin
: $(vmlinux-dirs
:%=%/modules.builtin
)
1345 $(Q
)$(AWK
) '!x[$$0]++' $^
> $(objtree
)/modules.builtin
1347 %/modules.builtin
: include/config
/auto.conf
1348 $(Q
)$(MAKE
) $(modbuiltin
)=$*
1351 # Target to prepare building external modules
1352 PHONY
+= modules_prepare
1353 modules_prepare
: prepare scripts
1355 # Target to install modules
1356 PHONY
+= modules_install
1357 modules_install
: _modinst_ _modinst_post
1361 @
rm -rf
$(MODLIB
)/kernel
1362 @
rm -f
$(MODLIB
)/source
1363 @mkdir
-p
$(MODLIB
)/kernel
1364 @ln
-s
$(abspath
$(srctree
)) $(MODLIB
)/source
1365 @if
[ ! $(objtree
) -ef
$(MODLIB
)/build
]; then \
1366 rm -f
$(MODLIB
)/build
; \
1367 ln
-s
$(CURDIR
) $(MODLIB
)/build
; \
1369 @cp
-f
$(objtree
)/modules.order
$(MODLIB
)/
1370 @cp
-f
$(objtree
)/modules.builtin
$(MODLIB
)/
1371 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1373 # This depmod is only for convenience to give the initial
1374 # boot a modules.dep even before / is mounted read-write. However the
1375 # boot script depmod is the master version.
1376 PHONY
+= _modinst_post
1377 _modinst_post
: _modinst_
1380 ifeq ($(CONFIG_MODULE_SIG
), y
)
1381 PHONY
+= modules_sign
1383 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modsign
1386 else # CONFIG_MODULES
1388 # Modules not configured
1389 # ---------------------------------------------------------------------------
1391 PHONY
+= modules modules_install
1392 modules modules_install
:
1394 @echo
>&2 "The present kernel configuration has modules disabled."
1395 @echo
>&2 "Type 'make config' and enable loadable module support."
1396 @echo
>&2 "Then build a kernel with module support enabled."
1400 endif # CONFIG_MODULES
1403 # Cleaning is done on three levels.
1404 # make clean Delete most generated files
1405 # Leave enough to build external modules
1406 # make mrproper Delete the current configuration, and all generated files
1407 # make distclean Remove editor backup files, patch leftover files and the like
1409 # Directories & files removed with 'make clean'
1410 CLEAN_DIRS
+= $(MODVERDIR
)
1412 # Directories & files removed with 'make mrproper'
1413 MRPROPER_DIRS
+= include/config usr
/include include/generated \
1414 arch
/*/include/generated .tmp_objdiff
1415 MRPROPER_FILES
+= .config .config.old .version .old_version \
1416 Module.symvers
tags TAGS cscope
* GPATH GTAGS GRTAGS GSYMS \
1417 signing_key.pem signing_key.priv signing_key.x509 \
1418 x509.genkey extra_certificates signing_key.x509.keyid \
1419 signing_key.x509.signer vmlinux-gdb.py
1421 # clean - Delete most, but leave enough to build external modules
1423 clean: rm-dirs
:= $(CLEAN_DIRS
)
1424 clean: rm-files
:= $(CLEAN_FILES
)
1425 clean-dirs
:= $(addprefix _clean_
, .
$(vmlinux-alldirs
) Documentation samples
)
1427 PHONY
+= $(clean-dirs
) clean archclean vmlinuxclean
1429 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1432 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/link-vmlinux.sh
clean
1433 $(Q
)$(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) clean)
1435 clean: archclean vmlinuxclean
1437 # mrproper - Delete all generated files, including .config
1439 mrproper
: rm-dirs
:= $(wildcard $(MRPROPER_DIRS
))
1440 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
1441 mrproper-dirs
:= $(addprefix _mrproper_
,scripts
)
1443 PHONY
+= $(mrproper-dirs
) mrproper archmrproper
1445 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
1447 mrproper
: clean archmrproper
$(mrproper-dirs
)
1456 @find
$(srctree
) $(RCS_FIND_IGNORE
) \
1457 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
1458 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'*%' \
1459 -o
-name
'core' \
) \
1460 -type f
-print | xargs
rm -f
1463 # Packaging of the kernel to various formats
1464 # ---------------------------------------------------------------------------
1465 # rpm target kept for backward compatibility
1466 package-dir
:= scripts
/package
1469 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1470 %pkg
: include/config
/kernel.release FORCE
1471 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1472 rpm
: include/config
/kernel.release FORCE
1473 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1476 # Brief documentation of the typical targets used
1477 # ---------------------------------------------------------------------------
1479 boards
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*_defconfig
)
1480 boards
:= $(sort $(notdir $(boards
)))
1481 board-dirs
:= $(dir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*/*_defconfig
))
1482 board-dirs
:= $(sort $(notdir $(board-dirs
:/=)))
1486 @echo
'Cleaning targets:'
1487 @echo
' clean - Remove most generated files but keep the config and'
1488 @echo
' enough build support to build external modules'
1489 @echo
' mrproper - Remove all generated files + config + various backup files'
1490 @echo
' distclean - mrproper + remove editor backup and patch files'
1492 @echo
'Configuration targets:'
1493 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
1495 @echo
'Other generic targets:'
1496 @echo
' all - Build all targets marked with [*]'
1497 @echo
'* vmlinux - Build the bare kernel'
1498 @echo
'* modules - Build all modules'
1499 @echo
' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1500 @echo
' dir/ - Build all files in dir and below'
1501 @echo
' dir/file.[ois] - Build specified target only'
1502 @echo
' dir/file.ll - Build the LLVM assembly file'
1503 @echo
' (requires compiler support for LLVM assembly generation)'
1504 @echo
' dir/file.lst - Build specified mixed source/assembly target only'
1505 @echo
' (requires a recent binutils and recent build (System.map))'
1506 @echo
' dir/file.ko - Build module including final link'
1507 @echo
' modules_prepare - Set up for building external modules'
1508 @echo
' tags/TAGS - Generate tags file for editors'
1509 @echo
' cscope - Generate cscope index'
1510 @echo
' gtags - Generate GNU GLOBAL index'
1511 @echo
' kernelrelease - Output the release version string (use with make -s)'
1512 @echo
' kernelversion - Output the version stored in Makefile (use with make -s)'
1513 @echo
' image_name - Output the image name (use with make -s)'
1514 @echo
' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1515 echo
' (default: $(INSTALL_HDR_PATH))'; \
1517 @echo
'Static analysers:'
1518 @echo
' checkstack - Generate a list of stack hogs'
1519 @echo
' namespacecheck - Name space analysis on compiled kernel'
1520 @echo
' versioncheck - Sanity check on version.h usage'
1521 @echo
' includecheck - Check for duplicate included header files'
1522 @echo
' export_report - List the usages of all exported symbols'
1523 @echo
' headers_check - Sanity check on exported headers'
1524 @echo
' headerdep - Detect inclusion cycles in headers'
1525 @
$(MAKE
) -f
$(srctree
)/scripts
/Makefile.help checker-help
1527 @echo
'Kernel selftest:'
1528 @echo
' kselftest - Build and run kernel selftest (run as root)'
1529 @echo
' Build, install, and boot kernel before'
1530 @echo
' running kselftest on it'
1531 @echo
' kselftest-clean - Remove all generated kselftest files'
1532 @echo
' kselftest-merge - Merge all the config dependencies of kselftest to existing'
1535 @echo
'Userspace tools targets:'
1536 @echo
' use "make tools/help"'
1537 @echo
' or "cd tools; make help"'
1539 @echo
'Kernel packaging:'
1540 @
$(MAKE
) $(build
)=$(package-dir
) help
1542 @echo
'Documentation targets:'
1543 @
$(MAKE
) -f
$(srctree
)/Documentation
/Makefile dochelp
1545 @echo
'Architecture specific targets ($(SRCARCH)):'
1546 @
$(if
$(archhelp
),$(archhelp
),\
1547 echo
' No architecture specific help defined for $(SRCARCH)')
1550 $(foreach b
, $(boards
), \
1551 printf
" %-24s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
1553 @
$(if
$(board-dirs
), \
1554 $(foreach b
, $(board-dirs
), \
1555 printf
" %-16s - Show %s-specific targets\\n" help-
$(b
) $(b
);) \
1556 printf
" %-16s - Show all of the above\\n" help-boards
; \
1559 @echo
' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1560 @echo
' make V=2 [targets] 2 => give reason for rebuild of target'
1561 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
1562 @echo
' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1563 @echo
' make C=2 [targets] Force check of all c source with $$CHECK'
1564 @echo
' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1565 @echo
' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1566 @echo
' 1: warnings which may be relevant and do not occur too often'
1567 @echo
' 2: warnings which occur quite often but may still be relevant'
1568 @echo
' 3: more obscure warnings, can most likely be ignored'
1569 @echo
' Multiple levels can be combined with W=12 or W=123'
1571 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
1572 @echo
'For further info see the ./README file'
1575 help-board-dirs
:= $(addprefix help-
,$(board-dirs
))
1577 help-boards
: $(help-board-dirs
)
1579 boards-per-dir
= $(sort $(notdir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/$*/*_defconfig
)))
1581 $(help-board-dirs
): help-
%:
1582 @echo
'Architecture specific targets ($(SRCARCH) $*):'
1583 @
$(if
$(boards-per-dir
), \
1584 $(foreach b
, $(boards-per-dir
), \
1585 printf
" %-24s - Build for %s\\n" $*/$(b
) $(subst _defconfig
,,$(b
));) \
1589 # Documentation targets
1590 # ---------------------------------------------------------------------------
1591 DOC_TARGETS
:= xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs linkcheckdocs
1592 PHONY
+= $(DOC_TARGETS
)
1593 $(DOC_TARGETS
): scripts_basic FORCE
1594 $(Q
)$(MAKE
) $(build
)=Documentation
$@
1596 else # KBUILD_EXTMOD
1599 # External module support.
1600 # When building external modules the kernel used as basis is considered
1601 # read-only, and no consistency checks are made and the make
1602 # system is not used on the basis kernel. If updates are required
1603 # in the basis kernel ordinary make commands (without M=...) must
1606 # The following are the only valid targets when building external
1608 # make M=dir clean Delete all automatically generated files
1609 # make M=dir modules Make all modules in specified dir
1610 # make M=dir Same as 'make M=dir modules'
1611 # make M=dir modules_install
1612 # Install the modules built in the module directory
1613 # Assumes install directory is already created
1615 # We are always building modules
1617 PHONY
+= crmodverdir
1621 PHONY
+= $(objtree
)/Module.symvers
1622 $(objtree
)/Module.symvers
:
1623 @
test -e
$(objtree
)/Module.symvers ||
( \
1625 echo
" WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1626 echo
" is missing; modules will have no dependencies and modversions."; \
1629 module-dirs
:= $(addprefix _module_
,$(KBUILD_EXTMOD
))
1630 PHONY
+= $(module-dirs
) modules
1631 $(module-dirs
): crmodverdir
$(objtree
)/Module.symvers
1632 $(Q
)$(MAKE
) $(build
)=$(patsubst _module_
%,%,$@
)
1634 modules
: $(module-dirs
)
1635 @
$(kecho
) ' Building modules, stage 2.';
1636 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1638 PHONY
+= modules_install
1639 modules_install
: _emodinst_ _emodinst_post
1641 install-dir
:= $(if
$(INSTALL_MOD_DIR
),$(INSTALL_MOD_DIR
),extra
)
1644 $(Q
)mkdir
-p
$(MODLIB
)/$(install-dir
)
1645 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1647 PHONY
+= _emodinst_post
1648 _emodinst_post
: _emodinst_
1651 clean-dirs
:= $(addprefix _clean_
,$(KBUILD_EXTMOD
))
1653 PHONY
+= $(clean-dirs
) clean
1655 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1657 clean: rm-dirs
:= $(MODVERDIR
)
1658 clean: rm-files
:= $(KBUILD_EXTMOD
)/Module.symvers
1662 @echo
' Building external modules.'
1663 @echo
' Syntax: make -C path/to/kernel/src M=$$PWD target'
1665 @echo
' modules - default target, build the module(s)'
1666 @echo
' modules_install - install the module'
1667 @echo
' clean - remove generated files in module directory only'
1671 PHONY
+= prepare scripts
1674 endif # KBUILD_EXTMOD
1676 clean: $(clean-dirs
)
1679 @find
$(if
$(KBUILD_EXTMOD
), $(KBUILD_EXTMOD
), .
) $(RCS_FIND_IGNORE
) \
1680 \
( -name
'*.[oas]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
1684 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
1685 -o
-name
'*.symtypes' -o
-name
'modules.order' \
1686 -o
-name modules.builtin
-o
-name
'.tmp_*.o.*' \
1687 -o
-name
'*.c.[012]*.*' \
1690 -o
-name
'*.*.symversions' \
) -type f
-print | xargs
rm -f
1692 # Generate tags for editors
1693 # ---------------------------------------------------------------------------
1694 quiet_cmd_tags
= GEN
$@
1695 cmd_tags
= $(CONFIG_SHELL
) $(srctree
)/scripts
/tags.sh
$@
1697 tags TAGS cscope gtags
: FORCE
1700 # Scripts to check various things for consistency
1701 # ---------------------------------------------------------------------------
1703 PHONY
+= includecheck versioncheck coccicheck namespacecheck export_report
1706 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1707 -name
'*.[hcS]' -type f
-print |
sort \
1708 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkincludes.pl
1711 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1712 -name
'*.[hcS]' -type f
-print |
sort \
1713 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkversion.pl
1716 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/$@
1719 $(PERL
) $(srctree
)/scripts
/namespace.pl
1722 $(PERL
) $(srctree
)/scripts
/export_report.pl
1724 endif #ifeq ($(config-targets),1)
1725 endif #ifeq ($(mixed-targets),1)
1727 PHONY
+= checkstack kernelrelease kernelversion image_name
1729 # UML needs a little special treatment here. It wants to use the host
1730 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1731 # else wants $(ARCH), including people doing cross-builds, which means
1732 # that $(SUBARCH) doesn't work here.
1734 CHECKSTACK_ARCH
:= $(SUBARCH
)
1736 CHECKSTACK_ARCH
:= $(ARCH
)
1739 $(OBJDUMP
) -d vmlinux
$$(find .
-name
'*.ko') | \
1740 $(PERL
) $(src
)/scripts
/checkstack.pl
$(CHECKSTACK_ARCH
)
1743 @echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1746 @echo
$(KERNELVERSION
)
1749 @echo
$(KBUILD_IMAGE
)
1751 # Clear a bunch of variables before executing the submake
1753 $(Q
)mkdir
-p
$(objtree
)/tools
1754 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(src
)/tools
/
1757 $(Q
)mkdir
-p
$(objtree
)/tools
1758 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(src
)/tools
/ $*
1761 # ---------------------------------------------------------------------------
1762 # Single targets are compatible with:
1763 # - build with mixed source and output
1764 # - build with separate output dir 'make O=...'
1765 # - external modules
1767 # target-dir => where to store outputfile
1768 # build-dir => directory in kernel source tree to use
1770 ifeq ($(KBUILD_EXTMOD
),)
1771 build-dir
= $(patsubst %/,%,$(dir $@
))
1772 target-dir
= $(dir $@
)
1774 zap-slash
=$(filter-out .
,$(patsubst %/,%,$(dir $@
)))
1775 build-dir
= $(KBUILD_EXTMOD
)$(if
$(zap-slash
),/$(zap-slash
))
1776 target-dir
= $(if
$(KBUILD_EXTMOD
),$(dir $<),$(dir $@
))
1779 %.s
: %.c prepare scripts FORCE
1780 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1781 %.i
: %.c prepare scripts FORCE
1782 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1783 %.o
: %.c prepare scripts FORCE
1784 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1785 %.lst
: %.c prepare scripts FORCE
1786 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1787 %.s
: %.S prepare scripts FORCE
1788 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1789 %.o
: %.S prepare scripts FORCE
1790 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1791 %.symtypes
: %.c prepare scripts FORCE
1792 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1793 %.ll
: %.c prepare scripts FORCE
1794 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1797 /: prepare scripts FORCE
1799 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1800 $(build
)=$(build-dir
)
1801 # Make sure the latest headers are built for Documentation
1802 Documentation
/ samples
/: headers_install
1803 %/: prepare scripts FORCE
1805 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1806 $(build
)=$(build-dir
)
1807 %.ko
: prepare scripts FORCE
1809 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1810 $(build
)=$(build-dir
) $(@
:.ko
=.o
)
1811 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1813 # FIXME Should go into a make.lib or something
1814 # ===========================================================================
1816 quiet_cmd_rmdirs
= $(if
$(wildcard $(rm-dirs
)),CLEAN
$(wildcard $(rm-dirs
)))
1817 cmd_rmdirs
= rm -rf
$(rm-dirs
)
1819 quiet_cmd_rmfiles
= $(if
$(wildcard $(rm-files
)),CLEAN
$(wildcard $(rm-files
)))
1820 cmd_rmfiles
= rm -f
$(rm-files
)
1822 # Run depmod only if we have System.map and depmod is executable
1823 quiet_cmd_depmod
= DEPMOD
$(KERNELRELEASE
)
1824 cmd_depmod
= $(CONFIG_SHELL
) $(srctree
)/scripts
/depmod.sh
$(DEPMOD
) \
1825 $(KERNELRELEASE
) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1827 # Create temporary dir for module support files
1828 # clean it up only when building all modules
1829 cmd_crmodverdir
= $(Q
)mkdir
-p
$(MODVERDIR
) \
1830 $(if
$(KBUILD_MODULES
),; rm -f
$(MODVERDIR
)/*)
1832 # read all saved command lines
1834 targets
:= $(wildcard $(sort $(targets
)))
1835 cmd_files
:= $(wildcard .
*.cmd
$(foreach f
,$(targets
),$(dir $(f
)).
$(notdir $(f
)).cmd
))
1837 ifneq ($(cmd_files
),)
1838 $(cmd_files
): ; # Do not try to update included dependency files
1839 include $(cmd_files
)
1842 endif # skip-makefile
1847 # Declare the contents of the .PHONY variable as phony. We keep that
1848 # information in a variable so we can use it in if_changed and friends.