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.a 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 clean-targets
:= %clean mrproper cleandocs
224 no-dot-config-targets
:= $(clean-targets
) \
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 $(MAKECMDGOALS
)),1)
248 # For "make -j clean all", "make -j mrproper defconfig all", etc.
249 ifneq ($(filter $(clean-targets
),$(MAKECMDGOALS
)),)
250 ifneq ($(filter-out $(clean-targets
),$(MAKECMDGOALS
)),)
255 # install and modules_install need also be processed one by one
256 ifneq ($(filter install,$(MAKECMDGOALS
)),)
257 ifneq ($(filter modules_install
,$(MAKECMDGOALS
)),)
262 ifeq ($(mixed-targets
),1)
263 # ===========================================================================
264 # We're called with mixed targets (*config and build targets).
265 # Handle them one by one.
267 PHONY
+= $(MAKECMDGOALS
) __build_one_by_one
269 $(filter-out __build_one_by_one
, $(MAKECMDGOALS
)): __build_one_by_one
274 for i in
$(MAKECMDGOALS
); do \
275 $(MAKE
) -f
$(srctree
)/Makefile
$$i; \
280 # We need some generic definitions (do not try to remake the file).
281 scripts
/Kbuild.
include: ;
282 include scripts
/Kbuild.
include
284 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
285 KERNELRELEASE
= $(shell cat
include/config
/kernel.release
2> /dev
/null
)
286 KERNELVERSION
= $(VERSION
)$(if
$(PATCHLEVEL
),.
$(PATCHLEVEL
)$(if
$(SUBLEVEL
),.
$(SUBLEVEL
)))$(EXTRAVERSION
)
287 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
289 # SUBARCH tells the usermode build what the underlying arch is. That is set
290 # first, and if a usermode build is happening, the "ARCH=um" on the command
291 # line overrides the setting of ARCH below. If a native build is happening,
292 # then ARCH is assigned, getting whatever value it gets normally, and
293 # SUBARCH is subsequently ignored.
295 SUBARCH
:= $(shell uname
-m | sed
-e s
/i
.86/x86
/ -e s
/x86_64
/x86
/ \
296 -e s
/sun4u
/sparc64
/ \
297 -e s
/arm.
*/arm
/ -e s
/sa110
/arm
/ \
298 -e s
/s390x
/s390
/ -e s
/parisc64
/parisc
/ \
299 -e s
/ppc.
*/powerpc
/ -e s
/mips.
*/mips
/ \
300 -e s
/sh
[234].
*/sh
/ -e s
/aarch64.
*/arm64
/ \
303 # Cross compiling and selecting different set of gcc/bin-utils
304 # ---------------------------------------------------------------------------
306 # When performing cross compilation for other architectures ARCH shall be set
307 # to the target architecture. (See arch/* for the possibilities).
308 # ARCH can be set during invocation of make:
310 # Another way is to have ARCH set in the environment.
311 # The default ARCH is the host where make is executed.
313 # CROSS_COMPILE specify the prefix used for all executables used
314 # during compilation. Only gcc and related bin-utils executables
315 # are prefixed with $(CROSS_COMPILE).
316 # CROSS_COMPILE can be set on the command line
317 # make CROSS_COMPILE=ia64-linux-
318 # Alternatively CROSS_COMPILE can be set in the environment.
319 # A third alternative is to store a setting in .config so that plain
320 # "make" in the configured kernel build directory always uses that.
321 # Default value for CROSS_COMPILE is not to prefix executables
322 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
324 CROSS_COMPILE ?
= $(CONFIG_CROSS_COMPILE
:"%"=%)
326 # Architecture as present in compile.h
327 UTS_MACHINE
:= $(ARCH
)
330 # Additional ARCH settings for x86
334 ifeq ($(ARCH
),x86_64
)
338 # Additional ARCH settings for sparc
339 ifeq ($(ARCH
),sparc32
)
342 ifeq ($(ARCH
),sparc64
)
346 # Additional ARCH settings for sh
351 KCONFIG_CONFIG ?
= .config
352 export KCONFIG_CONFIG
354 # SHELL used by kbuild
355 CONFIG_SHELL
:= $(shell if
[ -x
"$$BASH" ]; then echo
$$BASH; \
356 else if
[ -x
/bin
/bash
]; then echo
/bin
/bash
; \
357 else echo sh
; fi
; fi
)
359 HOST_LFS_CFLAGS
:= $(shell getconf LFS_CFLAGS
)
360 HOST_LFS_LDFLAGS
:= $(shell getconf LFS_LDFLAGS
)
361 HOST_LFS_LIBS
:= $(shell getconf LFS_LIBS
)
365 HOSTCFLAGS
:= -Wall
-Wmissing-prototypes
-Wstrict-prototypes
-O2 \
366 -fomit-frame-pointer
-std
=gnu89
$(HOST_LFS_CFLAGS
)
367 HOSTCXXFLAGS
:= -O2
$(HOST_LFS_CFLAGS
)
368 HOSTLDFLAGS
:= $(HOST_LFS_LDFLAGS
)
369 HOST_LOADLIBES
:= $(HOST_LFS_LIBS
)
371 # Make variables (CC, etc...)
372 AS
= $(CROSS_COMPILE
)as
373 LD
= $(CROSS_COMPILE
)ld
374 CC
= $(CROSS_COMPILE
)gcc
376 AR
= $(CROSS_COMPILE
)ar
377 NM
= $(CROSS_COMPILE
)nm
378 STRIP
= $(CROSS_COMPILE
)strip
379 OBJCOPY
= $(CROSS_COMPILE
)objcopy
380 OBJDUMP
= $(CROSS_COMPILE
)objdump
384 GENKSYMS
= scripts
/genksyms
/genksyms
385 INSTALLKERNEL
:= installkernel
386 DEPMOD
= /sbin
/depmod
393 CHECKFLAGS
:= -D__linux__
-Dlinux
-D__STDC__
-Dunix
-D__unix__ \
394 -Wbitwise
-Wno-return-void
-Wno-unknown-attribute
$(CF
)
403 # Use USERINCLUDE when you must reference the UAPI directories only.
405 -I
$(srctree
)/arch
/$(SRCARCH
)/include/uapi \
406 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated
/uapi \
407 -I
$(srctree
)/include/uapi \
408 -I
$(objtree
)/include/generated
/uapi \
409 -include $(srctree
)/include/linux
/kconfig.h
411 # Use LINUXINCLUDE when you must reference the include/ directory.
412 # Needed to be compatible with the O= option
414 -I
$(srctree
)/arch
/$(SRCARCH
)/include \
415 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated \
416 $(if
$(KBUILD_SRC
), -I
$(srctree
)/include) \
417 -I
$(objtree
)/include \
420 KBUILD_AFLAGS
:= -D__ASSEMBLY__
421 KBUILD_CFLAGS
:= -Wall
-Wundef
-Wstrict-prototypes
-Wno-trigraphs \
422 -fno-strict-aliasing
-fno-common
-fshort-wchar \
423 -Werror-implicit-function-declaration \
424 -Wno-format-security \
426 KBUILD_CPPFLAGS
:= -D__KERNEL__
427 KBUILD_AFLAGS_KERNEL
:=
428 KBUILD_CFLAGS_KERNEL
:=
429 KBUILD_AFLAGS_MODULE
:= -DMODULE
430 KBUILD_CFLAGS_MODULE
:= -DMODULE
431 KBUILD_LDFLAGS_MODULE
:= -T
$(srctree
)/scripts
/module-common.lds
433 GCC_PLUGINS_CFLAGS
:=
435 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
436 export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
437 export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
438 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
440 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
441 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
442 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
443 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
444 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
445 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
446 export KBUILD_ARFLAGS
448 # When compiling out-of-tree modules, put MODVERDIR in the module
449 # tree rather than in the kernel tree. The kernel tree might
451 export MODVERDIR
:= $(if
$(KBUILD_EXTMOD
),$(firstword $(KBUILD_EXTMOD
))/).tmp_versions
453 # Files to ignore in find ... statements
455 export RCS_FIND_IGNORE
:= \
( -name SCCS
-o
-name BitKeeper
-o
-name .svn
-o \
456 -name CVS
-o
-name .
pc -o
-name .hg
-o
-name .git \
) \
458 export RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn \
459 --exclude CVS
--exclude .
pc --exclude .hg
--exclude .git
461 # ===========================================================================
462 # Rules shared between *config targets and build targets
464 # Basic helpers built in scripts/basic/
465 PHONY
+= scripts_basic
467 $(Q
)$(MAKE
) $(build
)=scripts
/basic
468 $(Q
)rm -f .tmp_quiet_recordmcount
470 # To avoid any implicit rule to kick in, define an empty command.
471 scripts
/basic
/%: scripts_basic
;
473 PHONY
+= outputmakefile
474 # outputmakefile generates a Makefile in the output directory, if using a
475 # separate output directory. This allows convenient use of make in the
478 ifneq ($(KBUILD_SRC
),)
479 $(Q
)ln
-fsn
$(srctree
) source
480 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/mkmakefile \
481 $(srctree
) $(objtree
) $(VERSION
) $(PATCHLEVEL
)
484 ifeq ($(cc-name
),clang
)
485 ifneq ($(CROSS_COMPILE
),)
486 CLANG_TARGET
:= --target
=$(notdir $(CROSS_COMPILE
:%-=%))
487 GCC_TOOLCHAIN
:= $(realpath
$(dir $(shell which
$(LD
)))/..
)
489 ifneq ($(GCC_TOOLCHAIN
),)
490 CLANG_GCC_TC
:= --gcc-toolchain
=$(GCC_TOOLCHAIN
)
492 KBUILD_CFLAGS
+= $(CLANG_TARGET
) $(CLANG_GCC_TC
)
493 KBUILD_AFLAGS
+= $(CLANG_TARGET
) $(CLANG_GCC_TC
)
494 KBUILD_CFLAGS
+= $(call cc-option
, -no-integrated-as
)
495 KBUILD_AFLAGS
+= $(call cc-option
, -no-integrated-as
)
498 RETPOLINE_CFLAGS_GCC
:= -mindirect-branch
=thunk-extern
-mindirect-branch-register
499 RETPOLINE_CFLAGS_CLANG
:= -mretpoline-external-thunk
500 RETPOLINE_CFLAGS
:= $(call cc-option
,$(RETPOLINE_CFLAGS_GCC
),$(call cc-option
,$(RETPOLINE_CFLAGS_CLANG
)))
501 export RETPOLINE_CFLAGS
503 KBUILD_CFLAGS
+= $(call cc-option
,-fno-PIE
)
504 KBUILD_AFLAGS
+= $(call cc-option
,-fno-PIE
)
506 # check for 'asm goto'
507 ifeq ($(call shell-cached
,$(CONFIG_SHELL
) $(srctree
)/scripts
/gcc-goto.sh
$(CC
) $(KBUILD_CFLAGS
)), y
)
508 CC_HAVE_ASM_GOTO
:= 1
509 KBUILD_CFLAGS
+= -DCC_HAVE_ASM_GOTO
510 KBUILD_AFLAGS
+= -DCC_HAVE_ASM_GOTO
513 ifeq ($(call shell-cached
,$(CONFIG_SHELL
) $(srctree
)/scripts
/cc-can-link.sh
$(CC
)), y
)
518 ifeq ($(config-targets
),1)
519 # ===========================================================================
520 # *config targets only - make sure prerequisites are updated, and descend
521 # in scripts/kconfig to make the *config target
523 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
524 # KBUILD_DEFCONFIG may point out an alternative default configuration
525 # used for 'make defconfig'
526 include arch
/$(SRCARCH
)/Makefile
527 export KBUILD_DEFCONFIG KBUILD_KCONFIG
529 config
: scripts_basic outputmakefile FORCE
530 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
532 %config
: scripts_basic outputmakefile FORCE
533 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
536 # ===========================================================================
537 # Build targets only - this includes vmlinux, arch specific targets, clean
538 # targets and others. In general all targets except *config targets.
540 # If building an external module we do not care about the all: rule
541 # but instead _all depend on modules
543 ifeq ($(KBUILD_EXTMOD
),)
549 # Decide whether to build built-in, modular, or both.
550 # Normally, just do built-in.
555 # If we have only "make modules", don't compile built-in objects.
556 # When we're building modules with modversions, we need to consider
557 # the built-in objects during the descend as well, in order to
558 # make sure the checksums are up to date before we record them.
560 ifeq ($(MAKECMDGOALS
),modules
)
561 KBUILD_BUILTIN
:= $(if
$(CONFIG_MODVERSIONS
),1)
564 # If we have "make <whatever> modules", compile modules
565 # in addition to whatever we do anyway.
566 # Just "make" or "make all" shall build modules as well
568 ifneq ($(filter all _all modules
,$(MAKECMDGOALS
)),)
572 ifeq ($(MAKECMDGOALS
),)
576 export KBUILD_MODULES KBUILD_BUILTIN
578 ifeq ($(KBUILD_EXTMOD
),)
579 # Objects we will link into vmlinux / subdirs we need to visit
581 drivers-y
:= drivers
/ sound
/ firmware
/
586 endif # KBUILD_EXTMOD
588 ifeq ($(dot-config
),1)
590 -include include/config
/auto.conf
592 ifeq ($(KBUILD_EXTMOD
),)
593 # Read in dependencies to all Kconfig* files, make sure to run
594 # oldconfig if changes are detected.
595 -include include/config
/auto.conf.cmd
597 # To avoid any implicit rule to kick in, define an empty command
598 $(KCONFIG_CONFIG
) include/config
/auto.conf.cmd
: ;
600 # The actual configuration files used during the build are stored in
601 # include/generated/ and include/config/. Update them if .config is newer than
602 # include/config/auto.conf (which mirrors .config).
603 include/config
/%.conf
: $(KCONFIG_CONFIG
) include/config
/auto.conf.cmd
604 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile syncconfig
606 # external modules needs include/generated/autoconf.h and include/config/auto.conf
607 # but do not care if they are up-to-date. Use auto.conf to trigger the test
608 PHONY
+= include/config
/auto.conf
610 include/config
/auto.conf
:
611 $(Q
)test -e
include/generated
/autoconf.h
-a
-e
$@ ||
( \
613 echo
>&2 " ERROR: Kernel configuration is invalid."; \
614 echo
>&2 " include/generated/autoconf.h or $@ are missing.";\
615 echo
>&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
619 endif # KBUILD_EXTMOD
622 # Dummy target needed, because used as prerequisite
623 include/config
/auto.conf
: ;
624 endif # $(dot-config)
626 # The all: target is the default when no target is given on the
628 # This allow a user to issue only 'make' to build a kernel including modules
629 # Defaults to vmlinux, but the arch makefile usually adds further targets
632 CFLAGS_GCOV
:= -fprofile-arcs
-ftest-coverage \
633 $(call cc-option
,-fno-tree-loop-im
) \
634 $(call cc-disable-warning
,maybe-uninitialized
,)
635 export CFLAGS_GCOV CFLAGS_KCOV
637 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
638 # values of the respective KBUILD_* variables
642 include arch
/$(SRCARCH
)/Makefile
644 KBUILD_CFLAGS
+= $(call cc-option
,-fno-delete-null-pointer-checks
,)
645 KBUILD_CFLAGS
+= $(call cc-disable-warning
,frame-address
,)
646 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-truncation
)
647 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-overflow
)
648 KBUILD_CFLAGS
+= $(call cc-disable-warning
, int-in-bool-context
)
650 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
651 KBUILD_CFLAGS
+= $(call cc-option
,-Oz
,-Os
)
652 KBUILD_CFLAGS
+= $(call cc-disable-warning
,maybe-uninitialized
,)
654 ifdef CONFIG_PROFILE_ALL_BRANCHES
655 KBUILD_CFLAGS
+= -O2
$(call cc-disable-warning
,maybe-uninitialized
,)
661 KBUILD_CFLAGS
+= $(call cc-ifversion
, -lt
, 0409, \
662 $(call cc-disable-warning
,maybe-uninitialized
,))
664 # Tell gcc to never replace conditional load with a non-conditional one
665 KBUILD_CFLAGS
+= $(call cc-option
,--param
=allow-store-data-races
=0)
667 include scripts
/Makefile.kcov
668 include scripts
/Makefile.gcc-plugins
670 ifdef CONFIG_READABLE_ASM
671 # Disable optimizations that make assembler listings hard to read.
672 # reorder blocks reorders the control in the function
673 # ipa clone creates specialized cloned functions
674 # partial inlining inlines only parts of functions
675 KBUILD_CFLAGS
+= $(call cc-option
,-fno-reorder-blocks
,) \
676 $(call cc-option
,-fno-ipa-cp-clone
,) \
677 $(call cc-option
,-fno-partial-inlining
)
680 ifneq ($(CONFIG_FRAME_WARN
),0)
681 KBUILD_CFLAGS
+= $(call cc-option
,-Wframe-larger-than
=${CONFIG_FRAME_WARN})
684 # This selects the stack protector compiler flag. Testing it is delayed
685 # until after .config has been reprocessed, in the prepare-compiler-check
687 ifdef CONFIG_CC_STACKPROTECTOR_AUTO
688 stackp-flag
:= $(call cc-option
,-fstack-protector-strong
,$(call cc-option
,-fstack-protector
))
691 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
692 stackp-flag
:= -fstack-protector
693 stackp-name
:= REGULAR
695 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
696 stackp-flag
:= -fstack-protector-strong
697 stackp-name
:= STRONG
699 # If either there is no stack protector for this architecture or
700 # CONFIG_CC_STACKPROTECTOR_NONE is selected, we're done, and $(stackp-name)
701 # is empty, skipping all remaining stack protector tests.
703 # Force off for distro compilers that enable stack protector by default.
704 KBUILD_CFLAGS
+= $(call cc-option
, -fno-stack-protector
)
708 # Find arch-specific stack protector compiler sanity-checking script.
710 ifneq ($(stackp-flag
),)
711 stackp-path
:= $(srctree
)/scripts
/gcc-
$(SRCARCH
)_
$(BITS
)-has-stack-protector.sh
712 stackp-check
:= $(wildcard $(stackp-path
))
713 # If the wildcard test matches a test script, run it to check functionality.
715 ifneq ($(shell $(CONFIG_SHELL
) $(stackp-check
) $(CC
) $(KBUILD_CPPFLAGS
) $(biarch
)),y
)
720 # If the stack protector is functional, enable code that depends on it.
721 KBUILD_CPPFLAGS
+= -DCONFIG_CC_STACKPROTECTOR
722 # Either we've already detected the flag (for AUTO) or we'll fail the
723 # build in the prepare-compiler-check rule (for specific flag).
724 KBUILD_CFLAGS
+= $(stackp-flag
)
726 # We have to make sure stack protector is unconditionally disabled if
727 # the compiler is broken (in case we're going to continue the build in
729 KBUILD_CFLAGS
+= $(call cc-option
, -fno-stack-protector
)
734 ifeq ($(cc-name
),clang
)
735 KBUILD_CPPFLAGS
+= $(call cc-option
,-Qunused-arguments
,)
736 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-invalid-specifier
)
737 KBUILD_CFLAGS
+= $(call cc-disable-warning
, gnu
)
738 KBUILD_CFLAGS
+= $(call cc-disable-warning
, address-of-packed-member
)
739 # Quiet clang warning: comparison of unsigned expression < 0 is always false
740 KBUILD_CFLAGS
+= $(call cc-disable-warning
, tautological-compare
)
741 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
742 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
743 # See modpost pattern 2
744 KBUILD_CFLAGS
+= $(call cc-option
, -mno-global-merge
,)
745 KBUILD_CFLAGS
+= $(call cc-option
, -fcatch-undefined-behavior
)
748 # These warnings generated too much noise in a regular build.
749 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
750 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-but-set-variable
)
753 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-const-variable
)
754 ifdef CONFIG_FRAME_POINTER
755 KBUILD_CFLAGS
+= -fno-omit-frame-pointer
-fno-optimize-sibling-calls
757 # Some targets (ARM with Thumb2, for example), can't be built with frame
758 # pointers. For those, we don't have FUNCTION_TRACER automatically
759 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
760 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
761 # -fomit-frame-pointer with FUNCTION_TRACER.
762 ifndef CONFIG_FUNCTION_TRACER
763 KBUILD_CFLAGS
+= -fomit-frame-pointer
767 KBUILD_CFLAGS
+= $(call cc-option
, -fno-var-tracking-assignments
)
769 ifdef CONFIG_DEBUG_INFO
770 ifdef CONFIG_DEBUG_INFO_SPLIT
771 KBUILD_CFLAGS
+= $(call cc-option
, -gsplit-dwarf
, -g
)
775 KBUILD_AFLAGS
+= -Wa
,-gdwarf-2
777 ifdef CONFIG_DEBUG_INFO_DWARF4
778 KBUILD_CFLAGS
+= $(call cc-option
, -gdwarf-4
,)
781 ifdef CONFIG_DEBUG_INFO_REDUCED
782 KBUILD_CFLAGS
+= $(call cc-option
, -femit-struct-debug-baseonly
) \
783 $(call cc-option
,-fno-var-tracking
)
786 ifdef CONFIG_FUNCTION_TRACER
787 ifndef CC_FLAGS_FTRACE
788 CC_FLAGS_FTRACE
:= -pg
790 export CC_FLAGS_FTRACE
791 ifdef CONFIG_HAVE_FENTRY
792 CC_USING_FENTRY
:= $(call cc-option
, -mfentry
-DCC_USING_FENTRY
)
794 KBUILD_CFLAGS
+= $(CC_FLAGS_FTRACE
) $(CC_USING_FENTRY
)
795 KBUILD_AFLAGS
+= $(CC_USING_FENTRY
)
796 ifdef CONFIG_DYNAMIC_FTRACE
797 ifdef CONFIG_HAVE_C_RECORDMCOUNT
798 BUILD_C_RECORDMCOUNT
:= y
799 export BUILD_C_RECORDMCOUNT
804 # We trigger additional mismatches with less inlining
805 ifdef CONFIG_DEBUG_SECTION_MISMATCH
806 KBUILD_CFLAGS
+= $(call cc-option
, -fno-inline-functions-called-once
)
809 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
810 KBUILD_CFLAGS
+= $(call cc-option
,-ffunction-sections
,)
811 KBUILD_CFLAGS
+= $(call cc-option
,-fdata-sections
,)
814 # arch Makefile may override CC so keep this after arch Makefile is included
815 NOSTDINC_FLAGS
+= -nostdinc
-isystem
$(call shell-cached
,$(CC
) -print-file-name
=include)
816 CHECKFLAGS
+= $(NOSTDINC_FLAGS
)
818 # warn about C99 declaration after statement
819 KBUILD_CFLAGS
+= $(call cc-option
,-Wdeclaration-after-statement
,)
821 # disable pointer signed / unsigned warnings in gcc 4.0
822 KBUILD_CFLAGS
+= $(call cc-disable-warning
, pointer-sign
)
824 # disable invalid "can't wrap" optimizations for signed / pointers
825 KBUILD_CFLAGS
+= $(call cc-option
,-fno-strict-overflow
)
827 # clang sets -fmerge-all-constants by default as optimization, but this
828 # is non-conforming behavior for C and in fact breaks the kernel, so we
829 # need to disable it here generally.
830 KBUILD_CFLAGS
+= $(call cc-option
,-fno-merge-all-constants
)
832 # for gcc -fno-merge-all-constants disables everything, but it is fine
833 # to have actual conforming behavior enabled.
834 KBUILD_CFLAGS
+= $(call cc-option
,-fmerge-constants
)
836 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
837 KBUILD_CFLAGS
+= $(call cc-option
,-fno-stack-check
,)
839 # conserve stack if available
840 KBUILD_CFLAGS
+= $(call cc-option
,-fconserve-stack
)
842 # disallow errors like 'EXPORT_GPL(foo);' with missing header
843 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=implicit-int
)
845 # require functions to have arguments in prototypes, not empty 'int foo()'
846 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=strict-prototypes
)
848 # Prohibit date/time macros, which would make the build non-deterministic
849 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=date-time
)
851 # enforce correct pointer usage
852 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=incompatible-pointer-types
)
854 # Require designated initializers for all marked structures
855 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=designated-init
)
857 # change __FILE__ to the relative path from the srctree
858 KBUILD_CFLAGS
+= $(call cc-option
,-fmacro-prefix-map
=$(srctree
)/=)
860 # use the deterministic mode of AR if available
861 KBUILD_ARFLAGS
:= $(call ar-option
,D
)
863 include scripts
/Makefile.kasan
864 include scripts
/Makefile.extrawarn
865 include scripts
/Makefile.ubsan
867 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
869 KBUILD_CPPFLAGS
+= $(ARCH_CPPFLAGS
) $(KCPPFLAGS
)
870 KBUILD_AFLAGS
+= $(ARCH_AFLAGS
) $(KAFLAGS
)
871 KBUILD_CFLAGS
+= $(ARCH_CFLAGS
) $(KCFLAGS
)
873 # Use --build-id when available.
874 LDFLAGS_BUILD_ID
:= $(call ld-option
, --build-id
)
875 KBUILD_LDFLAGS_MODULE
+= $(LDFLAGS_BUILD_ID
)
876 LDFLAGS_vmlinux
+= $(LDFLAGS_BUILD_ID
)
878 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
879 LDFLAGS_vmlinux
+= $(call ld-option
, --gc-sections
,)
882 ifeq ($(CONFIG_STRIP_ASM_SYMS
),y
)
883 LDFLAGS_vmlinux
+= $(call ld-option
, -X
,)
886 # Default kernel image to build when no specific target is given.
887 # KBUILD_IMAGE may be overruled on the command line or
888 # set in the environment
889 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
891 export KBUILD_IMAGE ?
= vmlinux
894 # INSTALL_PATH specifies where to place the updated kernel and system map
895 # images. Default is /boot, but you can set it to other values
896 export INSTALL_PATH ?
= /boot
899 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
900 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
901 # an argument if needed. Otherwise it defaults to the kernel install path
903 export INSTALL_DTBS_PATH ?
= $(INSTALL_PATH
)/dtbs
/$(KERNELRELEASE
)
906 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
907 # relocations required by build roots. This is not defined in the
908 # makefile but the argument can be passed to make if needed.
911 MODLIB
= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
915 # INSTALL_MOD_STRIP, if defined, will cause modules to be
916 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
917 # the default option --strip-debug will be used. Otherwise,
918 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
920 ifdef INSTALL_MOD_STRIP
921 ifeq ($(INSTALL_MOD_STRIP
),1)
922 mod_strip_cmd
= $(STRIP
) --strip-debug
924 mod_strip_cmd
= $(STRIP
) $(INSTALL_MOD_STRIP
)
925 endif # INSTALL_MOD_STRIP=1
928 endif # INSTALL_MOD_STRIP
931 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
932 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
933 # or CONFIG_MODULE_COMPRESS_XZ.
935 mod_compress_cmd
= true
936 ifdef CONFIG_MODULE_COMPRESS
937 ifdef CONFIG_MODULE_COMPRESS_GZIP
938 mod_compress_cmd
= gzip
-n
-f
939 endif # CONFIG_MODULE_COMPRESS_GZIP
940 ifdef CONFIG_MODULE_COMPRESS_XZ
941 mod_compress_cmd
= xz
-f
942 endif # CONFIG_MODULE_COMPRESS_XZ
943 endif # CONFIG_MODULE_COMPRESS
944 export mod_compress_cmd
946 # Select initial ramdisk compression format, default is gzip(1).
947 # This shall be used by the dracut(8) tool while creating an initramfs image.
949 INITRD_COMPRESS-y
:= gzip
950 INITRD_COMPRESS-
$(CONFIG_RD_BZIP2
) := bzip2
951 INITRD_COMPRESS-
$(CONFIG_RD_LZMA
) := lzma
952 INITRD_COMPRESS-
$(CONFIG_RD_XZ
) := xz
953 INITRD_COMPRESS-
$(CONFIG_RD_LZO
) := lzo
954 INITRD_COMPRESS-
$(CONFIG_RD_LZ4
) := lz4
955 # do not export INITRD_COMPRESS, since we didn't actually
956 # choose a sane default compression above.
957 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
959 ifdef CONFIG_MODULE_SIG_ALL
960 $(eval
$(call config_filename
,MODULE_SIG_KEY
))
962 mod_sign_cmd
= scripts
/sign-file
$(CONFIG_MODULE_SIG_HASH
) $(MODULE_SIG_KEY_SRCPREFIX
)$(CONFIG_MODULE_SIG_KEY
) certs
/signing_key.x509
968 ifdef CONFIG_STACK_VALIDATION
969 has_libelf
:= $(call try-run
,\
970 echo
"int main() {}" |
$(HOSTCC
) -xc
-o
/dev
/null
-lelf
-,1,0)
971 ifeq ($(has_libelf
),1)
972 objtool_target
:= tools
/objtool FORCE
974 ifdef CONFIG_UNWINDER_ORC
975 $(error
"Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
977 $(warning
"Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
979 SKIP_STACK_VALIDATION
:= 1
980 export SKIP_STACK_VALIDATION
985 ifeq ($(KBUILD_EXTMOD
),)
986 core-y
+= kernel
/ certs
/ mm
/ fs
/ ipc
/ security
/ crypto
/ block
/
988 vmlinux-dirs
:= $(patsubst %/,%,$(filter %/, $(init-y
) $(init-m
) \
989 $(core-y
) $(core-m
) $(drivers-y
) $(drivers-m
) \
990 $(net-y
) $(net-m
) $(libs-y
) $(libs-m
) $(virt-y
)))
992 vmlinux-alldirs
:= $(sort $(vmlinux-dirs
) $(patsubst %/,%,$(filter %/, \
993 $(init-
) $(core-
) $(drivers-
) $(net-
) $(libs-
) $(virt-
))))
995 init-y
:= $(patsubst %/, %/built-in.a
, $(init-y
))
996 core-y
:= $(patsubst %/, %/built-in.a
, $(core-y
))
997 drivers-y
:= $(patsubst %/, %/built-in.a
, $(drivers-y
))
998 net-y
:= $(patsubst %/, %/built-in.a
, $(net-y
))
999 libs-y1
:= $(patsubst %/, %/lib.a
, $(libs-y
))
1000 libs-y2
:= $(patsubst %/, %/built-in.a
, $(filter-out %.a
, $(libs-y
)))
1001 virt-y
:= $(patsubst %/, %/built-in.a
, $(virt-y
))
1003 # Externally visible symbols (used by link-vmlinux.sh)
1004 export KBUILD_VMLINUX_INIT
:= $(head-y
) $(init-y
)
1005 export KBUILD_VMLINUX_MAIN
:= $(core-y
) $(libs-y2
) $(drivers-y
) $(net-y
) $(virt-y
)
1006 export KBUILD_VMLINUX_LIBS
:= $(libs-y1
)
1007 export KBUILD_LDS
:= arch
/$(SRCARCH
)/kernel
/vmlinux.lds
1008 export LDFLAGS_vmlinux
1009 # used by scripts/package/Makefile
1010 export KBUILD_ALLDIRS
:= $(sort $(filter-out arch
/%,$(vmlinux-alldirs
)) arch Documentation
include samples scripts tools
)
1012 vmlinux-deps
:= $(KBUILD_LDS
) $(KBUILD_VMLINUX_INIT
) $(KBUILD_VMLINUX_MAIN
) $(KBUILD_VMLINUX_LIBS
)
1014 # Recurse until adjust_autoksyms.sh is satisfied
1015 PHONY
+= autoksyms_recursive
1016 autoksyms_recursive
: $(vmlinux-deps
)
1017 ifdef CONFIG_TRIM_UNUSED_KSYMS
1018 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/adjust_autoksyms.sh \
1019 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1022 # For the kernel to actually contain only the needed exported symbols,
1023 # we have to build modules as well to determine what those symbols are.
1024 # (this can be evaluated only once include/config/auto.conf has been included)
1025 ifdef CONFIG_TRIM_UNUSED_KSYMS
1029 autoksyms_h
:= $(if
$(CONFIG_TRIM_UNUSED_KSYMS
), include/generated
/autoksyms.h
)
1032 $(Q
)mkdir
-p
$(dir $@
)
1035 ARCH_POSTLINK
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/Makefile.postlink
)
1037 # Final link of vmlinux with optional arch pass after final link
1038 cmd_link-vmlinux
= \
1039 $(CONFIG_SHELL
) $< $(LD
) $(LDFLAGS
) $(LDFLAGS_vmlinux
) ; \
1040 $(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) $@
, true
)
1042 vmlinux
: scripts
/link-vmlinux.sh autoksyms_recursive
$(vmlinux-deps
) FORCE
1043 ifdef CONFIG_HEADERS_CHECK
1044 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile headers_check
1046 ifdef CONFIG_GDB_SCRIPTS
1047 $(Q
)ln
-fsn
$(abspath
$(srctree
)/scripts
/gdb
/vmlinux-gdb.py
)
1049 +$(call if_changed
,link-vmlinux
)
1051 # Build samples along the rest of the kernel
1052 ifdef CONFIG_SAMPLES
1053 vmlinux-dirs
+= samples
1056 # The actual objects are generated when descending,
1057 # make sure no implicit rule kicks in
1058 $(sort $(vmlinux-deps
)): $(vmlinux-dirs
) ;
1060 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1061 # Preset locale variables to speed up the build process. Limit locale
1062 # tweaks to this spot to avoid wrong language settings when running
1063 # make menuconfig etc.
1064 # Error messages still appears in the original language
1066 PHONY
+= $(vmlinux-dirs
)
1067 $(vmlinux-dirs
): prepare scripts
1068 $(Q
)$(MAKE
) $(build
)=$@ need-builtin
=1
1070 define filechk_kernel.release
1071 echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1074 # Store (new) KERNELRELEASE string in include/config/kernel.release
1075 include/config
/kernel.release
: include/config
/auto.conf FORCE
1076 $(call filechk
,kernel.release
)
1078 # Additional helpers built in scripts/
1079 # Carefully list dependencies so we do not try to build scripts twice
1082 scripts
: scripts_basic
include/config
/auto.conf
include/config
/tristate.conf \
1083 asm-generic gcc-plugins
$(autoksyms_h
)
1084 $(Q
)$(MAKE
) $(build
)=$(@
)
1086 # Things we need to do before we recursively start building the kernel
1087 # or the modules are listed in "prepare".
1088 # A multi level approach is used. prepareN is processed before prepareN-1.
1089 # archprepare is used in arch Makefiles and when processed asm symlink,
1090 # version.h and scripts_basic is processed / created.
1092 # Listed in dependency order
1093 PHONY
+= prepare archprepare prepare0 prepare1 prepare2 prepare3
1095 # prepare3 is used to check if we are building in a separate output directory,
1097 # 1) Check that make has not been executed in the kernel src $(srctree)
1098 prepare3
: include/config
/kernel.release
1099 ifneq ($(KBUILD_SRC
),)
1100 @
$(kecho
) ' Using $(srctree) as source for kernel'
1101 $(Q
)if
[ -f
$(srctree
)/.config
-o
-d
$(srctree
)/include/config
]; then \
1102 echo
>&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1103 echo
>&2 " in the '$(srctree)' directory.";\
1108 # prepare2 creates a makefile if using a separate output directory.
1109 # From this point forward, .config has been reprocessed, so any rules
1110 # that need to depend on updated CONFIG_* values can be checked here.
1111 prepare2
: prepare3 prepare-compiler-check outputmakefile asm-generic
1113 prepare1
: prepare2
$(version_h
) $(autoksyms_h
) include/generated
/utsrelease.h \
1114 include/config
/auto.conf
1117 archprepare
: archheaders archscripts prepare1 scripts_basic
1119 prepare0
: archprepare gcc-plugins
1120 $(Q
)$(MAKE
) $(build
)=.
1122 # All the preparing..
1123 prepare
: prepare0 prepare-objtool
1125 # Support for using generic headers in asm-generic
1126 PHONY
+= asm-generic uapi-asm-generic
1127 asm-generic
: uapi-asm-generic
1128 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.asm-generic \
1129 src
=asm obj
=arch
/$(SRCARCH
)/include/generated
/asm
1131 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.asm-generic \
1132 src
=uapi
/asm obj
=arch
/$(SRCARCH
)/include/generated
/uapi
/asm
1134 PHONY
+= prepare-objtool
1135 prepare-objtool
: $(objtool_target
)
1137 # Check for CONFIG flags that require compiler support. Abort the build
1138 # after .config has been processed, but before the kernel build starts.
1140 # For security-sensitive CONFIG options, we don't want to fallback and/or
1141 # silently change which compiler flags will be used, since that leads to
1142 # producing kernels with different security feature characteristics
1143 # depending on the compiler used. (For example, "But I selected
1144 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1145 PHONY
+= prepare-compiler-check
1146 prepare-compiler-check
: FORCE
1147 # Make sure compiler supports requested stack protector flag.
1149 # Warn about CONFIG_CC_STACKPROTECTOR_AUTO having found no option.
1150 ifeq ($(stackp-flag
),)
1151 @echo CONFIG_CC_STACKPROTECTOR_
$(stackp-name
): \
1152 Compiler does not support any known stack-protector
>&2
1154 # Fail if specifically requested stack protector is missing.
1155 ifeq ($(call cc-option
, $(stackp-flag
)),)
1156 @echo Cannot use CONFIG_CC_STACKPROTECTOR_
$(stackp-name
): \
1157 $(stackp-flag
) not supported by compiler
>&2 && exit
1
1161 # Make sure compiler does not have buggy stack-protector support. If a
1162 # specific stack-protector was requested, fail the build, otherwise warn.
1164 ifeq ($(stackp-name
),AUTO
)
1165 @echo CONFIG_CC_STACKPROTECTOR_
$(stackp-name
): \
1166 $(stackp-flag
) available but compiler is broken
: disabling
>&2
1168 @echo Cannot use CONFIG_CC_STACKPROTECTOR_
$(stackp-name
): \
1169 $(stackp-flag
) available but compiler is broken
>&2 && exit
1
1174 # Generate some files
1175 # ---------------------------------------------------------------------------
1177 # KERNELRELEASE can change from a few different places, meaning version.h
1178 # needs to be updated, so this check is forced on all builds
1181 define filechk_utsrelease.h
1182 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
1183 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1186 (echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1189 define filechk_version.h
1190 (echo \
#define LINUX_VERSION_CODE $(shell \
1191 expr
$(VERSION
) \
* 65536 + 0$(PATCHLEVEL
) \
* 256 + 0$(SUBLEVEL
)); \
1192 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1195 $(version_h
): $(srctree
)/Makefile FORCE
1196 $(call filechk
,version.h
)
1197 $(Q
)rm -f
$(old_version_h
)
1199 include/generated
/utsrelease.h
: include/config
/kernel.release FORCE
1200 $(call filechk
,utsrelease.h
)
1204 $(Q
)find
$(srctree
)/include/ -name
'*.h' | xargs
--max-args
1 \
1205 $(srctree
)/scripts
/headerdep.pl
-I
$(srctree
)/include
1207 # ---------------------------------------------------------------------------
1210 #Default location for installed headers
1211 export INSTALL_HDR_PATH
= $(objtree
)/usr
1213 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1214 hdr-dst
= $(if
$(KBUILD_HEADERS
), dst
=include/arch-
$(SRCARCH
), dst
=include)
1216 PHONY
+= archheaders
1219 PHONY
+= archscripts
1223 __headers
: $(version_h
) scripts_basic uapi-asm-generic archheaders archscripts
1224 $(Q
)$(MAKE
) $(build
)=scripts build_unifdef
1226 PHONY
+= headers_install_all
1227 headers_install_all
:
1228 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
install
1230 PHONY
+= headers_install
1231 headers_install
: __headers
1232 $(if
$(wildcard $(srctree
)/arch
/$(SRCARCH
)/include/uapi
/asm
/Kbuild
),, \
1233 $(error Headers not exportable for the
$(SRCARCH
) architecture
))
1234 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi dst
=include
1235 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(SRCARCH
)/include/uapi
$(hdr-dst
)
1237 PHONY
+= headers_check_all
1238 headers_check_all
: headers_install_all
1239 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
check
1241 PHONY
+= headers_check
1242 headers_check
: headers_install
1243 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi dst
=include HDRCHECK
=1
1244 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(SRCARCH
)/include/uapi
$(hdr-dst
) HDRCHECK
=1
1246 # ---------------------------------------------------------------------------
1251 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests run_tests
1253 PHONY
+= kselftest-clean
1255 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests
clean
1257 PHONY
+= kselftest-merge
1259 $(if
$(wildcard $(objtree
)/.config
),, $(error No .config exists
, config your kernel first
!))
1260 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/kconfig
/merge_config.sh \
1261 -m
$(objtree
)/.config \
1262 $(srctree
)/tools
/testing
/selftests
/*/config
1263 +$(Q
)$(MAKE
) -f
$(srctree
)/Makefile olddefconfig
1265 # ---------------------------------------------------------------------------
1268 ifdef CONFIG_MODULES
1270 # By default, build modules as well
1276 # A module can be listed more than once in obj-m resulting in
1277 # duplicate lines in modules.order files. Those are removed
1278 # using awk while concatenating to the final file.
1281 modules
: $(vmlinux-dirs
) $(if
$(KBUILD_BUILTIN
),vmlinux
) modules.builtin
1282 $(Q
)$(AWK
) '!x[$$0]++' $(vmlinux-dirs
:%=$(objtree
)/%/modules.order
) > $(objtree
)/modules.order
1283 @
$(kecho
) ' Building modules, stage 2.';
1284 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1286 modules.builtin
: $(vmlinux-dirs
:%=%/modules.builtin
)
1287 $(Q
)$(AWK
) '!x[$$0]++' $^
> $(objtree
)/modules.builtin
1289 %/modules.builtin
: include/config
/auto.conf
1290 $(Q
)$(MAKE
) $(modbuiltin
)=$*
1293 # Target to prepare building external modules
1294 PHONY
+= modules_prepare
1295 modules_prepare
: prepare scripts
1297 # Target to install modules
1298 PHONY
+= modules_install
1299 modules_install
: _modinst_ _modinst_post
1303 @
rm -rf
$(MODLIB
)/kernel
1304 @
rm -f
$(MODLIB
)/source
1305 @mkdir
-p
$(MODLIB
)/kernel
1306 @ln
-s
$(abspath
$(srctree
)) $(MODLIB
)/source
1307 @if
[ ! $(objtree
) -ef
$(MODLIB
)/build
]; then \
1308 rm -f
$(MODLIB
)/build
; \
1309 ln
-s
$(CURDIR
) $(MODLIB
)/build
; \
1311 @cp
-f
$(objtree
)/modules.order
$(MODLIB
)/
1312 @cp
-f
$(objtree
)/modules.builtin
$(MODLIB
)/
1313 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1315 # This depmod is only for convenience to give the initial
1316 # boot a modules.dep even before / is mounted read-write. However the
1317 # boot script depmod is the master version.
1318 PHONY
+= _modinst_post
1319 _modinst_post
: _modinst_
1322 ifeq ($(CONFIG_MODULE_SIG
), y
)
1323 PHONY
+= modules_sign
1325 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modsign
1328 else # CONFIG_MODULES
1330 # Modules not configured
1331 # ---------------------------------------------------------------------------
1333 PHONY
+= modules modules_install
1334 modules modules_install
:
1336 @echo
>&2 "The present kernel configuration has modules disabled."
1337 @echo
>&2 "Type 'make config' and enable loadable module support."
1338 @echo
>&2 "Then build a kernel with module support enabled."
1342 endif # CONFIG_MODULES
1345 # Cleaning is done on three levels.
1346 # make clean Delete most generated files
1347 # Leave enough to build external modules
1348 # make mrproper Delete the current configuration, and all generated files
1349 # make distclean Remove editor backup files, patch leftover files and the like
1351 # Directories & files removed with 'make clean'
1352 CLEAN_DIRS
+= $(MODVERDIR
) include/ksym
1354 # Directories & files removed with 'make mrproper'
1355 MRPROPER_DIRS
+= include/config usr
/include include/generated \
1356 arch
/*/include/generated .tmp_objdiff
1357 MRPROPER_FILES
+= .config .config.old .version \
1358 Module.symvers
tags TAGS cscope
* GPATH GTAGS GRTAGS GSYMS \
1359 signing_key.pem signing_key.priv signing_key.x509 \
1360 x509.genkey extra_certificates signing_key.x509.keyid \
1361 signing_key.x509.signer vmlinux-gdb.py
1363 # clean - Delete most, but leave enough to build external modules
1365 clean: rm-dirs
:= $(CLEAN_DIRS
)
1366 clean: rm-files
:= $(CLEAN_FILES
)
1367 clean-dirs
:= $(addprefix _clean_
, .
$(vmlinux-alldirs
) Documentation samples
)
1369 PHONY
+= $(clean-dirs
) clean archclean vmlinuxclean
1371 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1374 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/link-vmlinux.sh
clean
1375 $(Q
)$(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) clean)
1377 clean: archclean vmlinuxclean
1379 # mrproper - Delete all generated files, including .config
1381 mrproper
: rm-dirs
:= $(wildcard $(MRPROPER_DIRS
))
1382 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
1383 mrproper-dirs
:= $(addprefix _mrproper_
,scripts
)
1385 PHONY
+= $(mrproper-dirs
) mrproper archmrproper
1387 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
1389 mrproper
: clean archmrproper
$(mrproper-dirs
)
1398 @find
$(srctree
) $(RCS_FIND_IGNORE
) \
1399 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
1400 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'*%' \
1401 -o
-name
'core' \
) \
1402 -type f
-print | xargs
rm -f
1405 # Packaging of the kernel to various formats
1406 # ---------------------------------------------------------------------------
1407 # rpm target kept for backward compatibility
1408 package-dir
:= scripts
/package
1411 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1412 %pkg
: include/config
/kernel.release FORCE
1413 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1415 @echo
" WARNING: \"rpm\" target will be removed after Linux 4.18"
1416 @echo
" Please use \"rpm-pkg\" instead."
1419 # Brief documentation of the typical targets used
1420 # ---------------------------------------------------------------------------
1422 boards
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*_defconfig
)
1423 boards
:= $(sort $(notdir $(boards
)))
1424 board-dirs
:= $(dir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*/*_defconfig
))
1425 board-dirs
:= $(sort $(notdir $(board-dirs
:/=)))
1429 @echo
'Cleaning targets:'
1430 @echo
' clean - Remove most generated files but keep the config and'
1431 @echo
' enough build support to build external modules'
1432 @echo
' mrproper - Remove all generated files + config + various backup files'
1433 @echo
' distclean - mrproper + remove editor backup and patch files'
1435 @echo
'Configuration targets:'
1436 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
1438 @echo
'Other generic targets:'
1439 @echo
' all - Build all targets marked with [*]'
1440 @echo
'* vmlinux - Build the bare kernel'
1441 @echo
'* modules - Build all modules'
1442 @echo
' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1443 @echo
' dir/ - Build all files in dir and below'
1444 @echo
' dir/file.[ois] - Build specified target only'
1445 @echo
' dir/file.ll - Build the LLVM assembly file'
1446 @echo
' (requires compiler support for LLVM assembly generation)'
1447 @echo
' dir/file.lst - Build specified mixed source/assembly target only'
1448 @echo
' (requires a recent binutils and recent build (System.map))'
1449 @echo
' dir/file.ko - Build module including final link'
1450 @echo
' modules_prepare - Set up for building external modules'
1451 @echo
' tags/TAGS - Generate tags file for editors'
1452 @echo
' cscope - Generate cscope index'
1453 @echo
' gtags - Generate GNU GLOBAL index'
1454 @echo
' kernelrelease - Output the release version string (use with make -s)'
1455 @echo
' kernelversion - Output the version stored in Makefile (use with make -s)'
1456 @echo
' image_name - Output the image name (use with make -s)'
1457 @echo
' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1458 echo
' (default: $(INSTALL_HDR_PATH))'; \
1460 @echo
'Static analysers:'
1461 @echo
' checkstack - Generate a list of stack hogs'
1462 @echo
' namespacecheck - Name space analysis on compiled kernel'
1463 @echo
' versioncheck - Sanity check on version.h usage'
1464 @echo
' includecheck - Check for duplicate included header files'
1465 @echo
' export_report - List the usages of all exported symbols'
1466 @echo
' headers_check - Sanity check on exported headers'
1467 @echo
' headerdep - Detect inclusion cycles in headers'
1468 @echo
' coccicheck - Check with Coccinelle'
1470 @echo
'Kernel selftest:'
1471 @echo
' kselftest - Build and run kernel selftest (run as root)'
1472 @echo
' Build, install, and boot kernel before'
1473 @echo
' running kselftest on it'
1474 @echo
' kselftest-clean - Remove all generated kselftest files'
1475 @echo
' kselftest-merge - Merge all the config dependencies of kselftest to existing'
1478 @echo
'Userspace tools targets:'
1479 @echo
' use "make tools/help"'
1480 @echo
' or "cd tools; make help"'
1482 @echo
'Kernel packaging:'
1483 @
$(MAKE
) $(build
)=$(package-dir
) help
1485 @echo
'Documentation targets:'
1486 @
$(MAKE
) -f
$(srctree
)/Documentation
/Makefile dochelp
1488 @echo
'Architecture specific targets ($(SRCARCH)):'
1489 @
$(if
$(archhelp
),$(archhelp
),\
1490 echo
' No architecture specific help defined for $(SRCARCH)')
1493 $(foreach b
, $(boards
), \
1494 printf
" %-24s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
1496 @
$(if
$(board-dirs
), \
1497 $(foreach b
, $(board-dirs
), \
1498 printf
" %-16s - Show %s-specific targets\\n" help-
$(b
) $(b
);) \
1499 printf
" %-16s - Show all of the above\\n" help-boards
; \
1502 @echo
' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1503 @echo
' make V=2 [targets] 2 => give reason for rebuild of target'
1504 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
1505 @echo
' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1506 @echo
' make C=2 [targets] Force check of all c source with $$CHECK'
1507 @echo
' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1508 @echo
' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1509 @echo
' 1: warnings which may be relevant and do not occur too often'
1510 @echo
' 2: warnings which occur quite often but may still be relevant'
1511 @echo
' 3: more obscure warnings, can most likely be ignored'
1512 @echo
' Multiple levels can be combined with W=12 or W=123'
1514 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
1515 @echo
'For further info see the ./README file'
1518 help-board-dirs
:= $(addprefix help-
,$(board-dirs
))
1520 help-boards
: $(help-board-dirs
)
1522 boards-per-dir
= $(sort $(notdir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/$*/*_defconfig
)))
1524 $(help-board-dirs
): help-
%:
1525 @echo
'Architecture specific targets ($(SRCARCH) $*):'
1526 @
$(if
$(boards-per-dir
), \
1527 $(foreach b
, $(boards-per-dir
), \
1528 printf
" %-24s - Build for %s\\n" $*/$(b
) $(subst _defconfig
,,$(b
));) \
1532 # Documentation targets
1533 # ---------------------------------------------------------------------------
1534 DOC_TARGETS
:= xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1535 linkcheckdocs dochelp refcheckdocs
1536 PHONY
+= $(DOC_TARGETS
)
1537 $(DOC_TARGETS
): scripts_basic FORCE
1538 $(Q
)$(MAKE
) $(build
)=Documentation
$@
1540 else # KBUILD_EXTMOD
1543 # External module support.
1544 # When building external modules the kernel used as basis is considered
1545 # read-only, and no consistency checks are made and the make
1546 # system is not used on the basis kernel. If updates are required
1547 # in the basis kernel ordinary make commands (without M=...) must
1550 # The following are the only valid targets when building external
1552 # make M=dir clean Delete all automatically generated files
1553 # make M=dir modules Make all modules in specified dir
1554 # make M=dir Same as 'make M=dir modules'
1555 # make M=dir modules_install
1556 # Install the modules built in the module directory
1557 # Assumes install directory is already created
1559 # We are always building modules
1561 PHONY
+= crmodverdir
1565 PHONY
+= $(objtree
)/Module.symvers
1566 $(objtree
)/Module.symvers
:
1567 @
test -e
$(objtree
)/Module.symvers ||
( \
1569 echo
" WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1570 echo
" is missing; modules will have no dependencies and modversions."; \
1573 module-dirs
:= $(addprefix _module_
,$(KBUILD_EXTMOD
))
1574 PHONY
+= $(module-dirs
) modules
1575 $(module-dirs
): crmodverdir
$(objtree
)/Module.symvers
1576 $(Q
)$(MAKE
) $(build
)=$(patsubst _module_
%,%,$@
)
1578 modules
: $(module-dirs
)
1579 @
$(kecho
) ' Building modules, stage 2.';
1580 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1582 PHONY
+= modules_install
1583 modules_install
: _emodinst_ _emodinst_post
1585 install-dir
:= $(if
$(INSTALL_MOD_DIR
),$(INSTALL_MOD_DIR
),extra
)
1588 $(Q
)mkdir
-p
$(MODLIB
)/$(install-dir
)
1589 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1591 PHONY
+= _emodinst_post
1592 _emodinst_post
: _emodinst_
1595 clean-dirs
:= $(addprefix _clean_
,$(KBUILD_EXTMOD
))
1597 PHONY
+= $(clean-dirs
) clean
1599 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1601 clean: rm-dirs
:= $(MODVERDIR
)
1602 clean: rm-files
:= $(KBUILD_EXTMOD
)/Module.symvers
1606 @echo
' Building external modules.'
1607 @echo
' Syntax: make -C path/to/kernel/src M=$$PWD target'
1609 @echo
' modules - default target, build the module(s)'
1610 @echo
' modules_install - install the module'
1611 @echo
' clean - remove generated files in module directory only'
1615 PHONY
+= prepare scripts
1618 endif # KBUILD_EXTMOD
1620 clean: $(clean-dirs
)
1623 @find
$(if
$(KBUILD_EXTMOD
), $(KBUILD_EXTMOD
), .
) $(RCS_FIND_IGNORE
) \
1624 \
( -name
'*.[aios]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
1625 -o
-name
'*.ko.*' -o
-name
'*.dtb' -o
-name
'*.dtb.S' \
1626 -o
-name
'*.dwo' -o
-name
'*.lst' \
1628 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
1629 -o
-name
'*.lex.c' -o
-name
'*.tab.[ch]' \
1630 -o
-name
'*.asn1.[ch]' \
1631 -o
-name
'*.symtypes' -o
-name
'modules.order' \
1632 -o
-name modules.builtin
-o
-name
'.tmp_*.o.*' \
1633 -o
-name .cache.mk \
1634 -o
-name
'*.c.[012]*.*' \
1636 -o
-name
'*.gcno' \
) -type f
-print | xargs
rm -f
1638 # Generate tags for editors
1639 # ---------------------------------------------------------------------------
1640 quiet_cmd_tags
= GEN
$@
1641 cmd_tags
= $(CONFIG_SHELL
) $(srctree
)/scripts
/tags.sh
$@
1643 tags TAGS cscope gtags
: FORCE
1646 # Scripts to check various things for consistency
1647 # ---------------------------------------------------------------------------
1649 PHONY
+= includecheck versioncheck coccicheck namespacecheck export_report
1652 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1653 -name
'*.[hcS]' -type f
-print |
sort \
1654 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkincludes.pl
1657 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1658 -name
'*.[hcS]' -type f
-print |
sort \
1659 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkversion.pl
1662 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/$@
1665 $(PERL
) $(srctree
)/scripts
/namespace.pl
1668 $(PERL
) $(srctree
)/scripts
/export_report.pl
1670 endif #ifeq ($(config-targets),1)
1671 endif #ifeq ($(mixed-targets),1)
1673 PHONY
+= checkstack kernelrelease kernelversion image_name
1675 # UML needs a little special treatment here. It wants to use the host
1676 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1677 # else wants $(ARCH), including people doing cross-builds, which means
1678 # that $(SUBARCH) doesn't work here.
1680 CHECKSTACK_ARCH
:= $(SUBARCH
)
1682 CHECKSTACK_ARCH
:= $(ARCH
)
1685 $(OBJDUMP
) -d vmlinux
$$(find .
-name
'*.ko') | \
1686 $(PERL
) $(src
)/scripts
/checkstack.pl
$(CHECKSTACK_ARCH
)
1689 @echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1692 @echo
$(KERNELVERSION
)
1695 @echo
$(KBUILD_IMAGE
)
1697 # Clear a bunch of variables before executing the submake
1699 $(Q
)mkdir
-p
$(objtree
)/tools
1700 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(src
)/tools
/
1703 $(Q
)mkdir
-p
$(objtree
)/tools
1704 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(src
)/tools
/ $*
1707 # ---------------------------------------------------------------------------
1708 # Single targets are compatible with:
1709 # - build with mixed source and output
1710 # - build with separate output dir 'make O=...'
1711 # - external modules
1713 # target-dir => where to store outputfile
1714 # build-dir => directory in kernel source tree to use
1716 ifeq ($(KBUILD_EXTMOD
),)
1717 build-dir
= $(patsubst %/,%,$(dir $@
))
1718 target-dir
= $(dir $@
)
1720 zap-slash
=$(filter-out .
,$(patsubst %/,%,$(dir $@
)))
1721 build-dir
= $(KBUILD_EXTMOD
)$(if
$(zap-slash
),/$(zap-slash
))
1722 target-dir
= $(if
$(KBUILD_EXTMOD
),$(dir $<),$(dir $@
))
1725 %.s
: %.c prepare scripts FORCE
1726 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1727 %.i
: %.c prepare scripts FORCE
1728 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1729 %.o
: %.c prepare scripts FORCE
1730 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1731 %.lst
: %.c prepare scripts FORCE
1732 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1733 %.s
: %.S prepare scripts FORCE
1734 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1735 %.o
: %.S prepare scripts FORCE
1736 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1737 %.symtypes
: %.c prepare scripts FORCE
1738 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1739 %.ll
: %.c prepare scripts FORCE
1740 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1743 /: prepare scripts FORCE
1745 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1746 $(build
)=$(build-dir
)
1747 # Make sure the latest headers are built for Documentation
1748 Documentation
/ samples
/: headers_install
1749 %/: prepare scripts FORCE
1751 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1752 $(build
)=$(build-dir
)
1753 %.ko
: prepare scripts FORCE
1755 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1756 $(build
)=$(build-dir
) $(@
:.ko
=.o
)
1757 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1759 # FIXME Should go into a make.lib or something
1760 # ===========================================================================
1762 quiet_cmd_rmdirs
= $(if
$(wildcard $(rm-dirs
)),CLEAN
$(wildcard $(rm-dirs
)))
1763 cmd_rmdirs
= rm -rf
$(rm-dirs
)
1765 quiet_cmd_rmfiles
= $(if
$(wildcard $(rm-files
)),CLEAN
$(wildcard $(rm-files
)))
1766 cmd_rmfiles
= rm -f
$(rm-files
)
1768 # Run depmod only if we have System.map and depmod is executable
1769 quiet_cmd_depmod
= DEPMOD
$(KERNELRELEASE
)
1770 cmd_depmod
= $(CONFIG_SHELL
) $(srctree
)/scripts
/depmod.sh
$(DEPMOD
) \
1771 $(KERNELRELEASE
) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1773 # Create temporary dir for module support files
1774 # clean it up only when building all modules
1775 cmd_crmodverdir
= $(Q
)mkdir
-p
$(MODVERDIR
) \
1776 $(if
$(KBUILD_MODULES
),; rm -f
$(MODVERDIR
)/*)
1778 # read all saved command lines
1780 cmd_files
:= $(wildcard .
*.cmd
$(foreach f
,$(sort $(targets
)),$(dir $(f
)).
$(notdir $(f
)).cmd
))
1782 ifneq ($(cmd_files
),)
1783 $(cmd_files
): ; # Do not try to update included dependency files
1784 include $(cmd_files
)
1787 endif # skip-makefile
1792 # Declare the contents of the .PHONY variable as phony. We keep that
1793 # information in a variable so we can use it in if_changed and friends.