1 # SPDX-License-Identifier: GPL-2.0
9 # To see a list of typical targets execute "make help"
10 # More info can be located in ./README
11 # Comments in this file are targeted only to the developer, do not
12 # expect to learn how to build the kernel reading this file.
14 # That's our default target when none is given on the command line
18 # o Do not use make's built-in rules and variables
19 # (this increases performance and avoids hard-to-debug behaviour);
20 # o Look for make include files relative to root of kernel src
21 MAKEFLAGS
+= -rR
--include-dir
=$(CURDIR
)
23 # Avoid funny character set dependencies
27 export LC_COLLATE LC_NUMERIC
29 # Avoid interference with shell env settings
32 # We are using a recursive build, so we need to do a little thinking
33 # to get the ordering right.
35 # Most importantly: sub-Makefiles should only ever modify files in
36 # their own directory. If in some directory we have a dependency on
37 # a file in another dir (which doesn't happen often, but it's often
38 # unavoidable when linking the built-in.o targets which finally
39 # turn into vmlinux), we will call a sub make in that other dir, and
40 # after that we are sure that everything which is in that other dir
43 # The only cases where we need to modify files which have global
44 # effects are thus separated out and done before the recursive
45 # descending is started. They are now explicitly listed as the
49 # ---------------------------------------------------------------------------
51 # Normally, we echo the whole command before executing it. By making
52 # that echo $($(quiet)$(cmd)), we now have the possibility to set
53 # $(quiet) to choose other forms of output instead, e.g.
55 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
56 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
58 # If $(quiet) is empty, the whole command will be printed.
59 # If it is set to "quiet_", only the short version will be printed.
60 # If it is set to "silent_", nothing will be printed at all, since
61 # the variable $(silent_cmd_cc_o_c) doesn't exist.
63 # A simple variant is to prefix commands with $(Q) - that's useful
64 # for commands that shall be hidden in non-verbose mode.
68 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
69 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
71 # To put more focus on warnings, be less verbose as default
72 # Use 'make V=1' to see the full commands
74 ifeq ("$(origin V)", "command line")
81 ifeq ($(KBUILD_VERBOSE
),1)
89 # If the user is running make -s (silent mode), suppress echoing of
92 ifneq ($(findstring s
,$(filter-out --%,$(MAKEFLAGS
))),)
97 export quiet Q KBUILD_VERBOSE
99 # kbuild supports saving output files in a separate directory.
100 # To locate output files in a separate directory two syntaxes are supported.
101 # In both cases the working directory must be the root of the kernel src.
103 # Use "make O=dir/to/store/output/files/"
105 # 2) Set KBUILD_OUTPUT
106 # Set the environment variable KBUILD_OUTPUT to point to the directory
107 # where the output files shall be placed.
108 # export KBUILD_OUTPUT=dir/to/store/output/files/
111 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
114 # KBUILD_SRC is not intended to be used by the regular user (for now),
115 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
116 ifeq ($(KBUILD_SRC
),)
118 # OK, Make called in directory where kernel src resides
119 # Do we want to locate output files in a separate directory?
120 ifeq ("$(origin O)", "command line")
121 KBUILD_OUTPUT
:= $(O
)
124 # Cancel implicit rules on top Makefile
125 $(CURDIR
)/Makefile Makefile
: ;
127 ifneq ($(words $(subst :, ,$(CURDIR
))), 1)
128 $(error main directory cannot contain spaces nor colons
)
131 ifneq ($(KBUILD_OUTPUT
),)
132 # check that the output directory actually exists
133 saved-output
:= $(KBUILD_OUTPUT
)
134 KBUILD_OUTPUT
:= $(shell mkdir
-p
$(KBUILD_OUTPUT
) && cd
$(KBUILD_OUTPUT
) \
136 $(if
$(KBUILD_OUTPUT
),, \
137 $(error failed to create output directory
"$(saved-output)"))
139 PHONY
+= $(MAKECMDGOALS
) sub-make
141 $(filter-out _all sub-make
$(CURDIR
)/Makefile
, $(MAKECMDGOALS
)) _all
: sub-make
144 # Invoke a second make in the output directory, passing relevant variables
146 $(Q
)$(MAKE
) -C
$(KBUILD_OUTPUT
) KBUILD_SRC
=$(CURDIR
) \
147 -f
$(CURDIR
)/Makefile
$(filter-out _all sub-make
,$(MAKECMDGOALS
))
149 # Leave processing to above invocation of make
151 endif # ifneq ($(KBUILD_OUTPUT),)
152 endif # ifeq ($(KBUILD_SRC),)
154 # We process the rest of the Makefile if this is the final invocation of make
155 ifeq ($(skip-makefile
),)
157 # Do not print "Entering directory ...",
158 # but we want to display it when entering to the output directory
159 # so that IDEs/editors are able to understand relative filenames.
160 MAKEFLAGS
+= --no-print-directory
162 # Call a source code checker (by default, "sparse") as part of the
165 # Use 'make C=1' to enable checking of only re-compiled files.
166 # Use 'make C=2' to enable checking of *all* source files, regardless
167 # of whether they are re-compiled or not.
169 # See the file "Documentation/dev-tools/sparse.rst" for more details,
170 # including where to get the "sparse" utility.
172 ifeq ("$(origin C)", "command line")
173 KBUILD_CHECKSRC
= $(C
)
175 ifndef KBUILD_CHECKSRC
179 # Use make M=dir to specify directory of external module to build
180 # Old syntax make ... SUBDIRS=$PWD is still supported
181 # Setting the environment variable KBUILD_EXTMOD take precedence
183 KBUILD_EXTMOD ?
= $(SUBDIRS
)
186 ifeq ("$(origin M)", "command line")
187 KBUILD_EXTMOD
:= $(M
)
190 ifeq ($(KBUILD_SRC
),)
191 # building in the source tree
194 ifeq ($(KBUILD_SRC
)/,$(dir $(CURDIR
)))
195 # building in a subdirectory of the source tree
198 srctree
:= $(KBUILD_SRC
)
202 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
208 VPATH
:= $(srctree
)$(if
$(KBUILD_EXTMOD
),:$(KBUILD_EXTMOD
))
210 export srctree objtree VPATH
212 # To make sure we do not include .config for any of the *config targets
213 # catch them early, and hand them over to scripts/kconfig/Makefile
214 # It is allowed to specify more targets when calling make, including
215 # mixing *config targets and build targets.
216 # For example 'make oldconfig all'.
217 # Detect when mixed targets is specified, and make a second invocation
218 # of make so .config is not included in this case either (for *config).
220 version_h
:= include/generated
/uapi
/linux
/version.h
221 old_version_h
:= include/linux
/version.h
223 no-dot-config-targets
:= clean mrproper
distclean \
224 cscope gtags TAGS
tags help
% %docs
check% coccicheck \
225 $(version_h
) headers_
% archheaders archscripts \
226 kernelversion
%src-pkg
232 ifneq ($(filter $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
233 ifeq ($(filter-out $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
238 ifeq ($(KBUILD_EXTMOD
),)
239 ifneq ($(filter config
%config
,$(MAKECMDGOALS
)),)
241 ifneq ($(words $(MAKECMDGOALS
)),1)
246 # install and modules_install need also be processed one by one
247 ifneq ($(filter install,$(MAKECMDGOALS
)),)
248 ifneq ($(filter modules_install
,$(MAKECMDGOALS
)),)
253 ifeq ($(mixed-targets
),1)
254 # ===========================================================================
255 # We're called with mixed targets (*config and build targets).
256 # Handle them one by one.
258 PHONY
+= $(MAKECMDGOALS
) __build_one_by_one
260 $(filter-out __build_one_by_one
, $(MAKECMDGOALS
)): __build_one_by_one
265 for i in
$(MAKECMDGOALS
); do \
266 $(MAKE
) -f
$(srctree
)/Makefile
$$i; \
271 # We need some generic definitions (do not try to remake the file).
272 scripts
/Kbuild.
include: ;
273 include scripts
/Kbuild.
include
275 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
276 KERNELRELEASE
= $(shell cat
include/config
/kernel.release
2> /dev
/null
)
277 KERNELVERSION
= $(VERSION
)$(if
$(PATCHLEVEL
),.
$(PATCHLEVEL
)$(if
$(SUBLEVEL
),.
$(SUBLEVEL
)))$(EXTRAVERSION
)
278 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
280 # SUBARCH tells the usermode build what the underlying arch is. That is set
281 # first, and if a usermode build is happening, the "ARCH=um" on the command
282 # line overrides the setting of ARCH below. If a native build is happening,
283 # then ARCH is assigned, getting whatever value it gets normally, and
284 # SUBARCH is subsequently ignored.
286 SUBARCH
:= $(shell uname
-m | sed
-e s
/i
.86/x86
/ -e s
/x86_64
/x86
/ \
287 -e s
/sun4u
/sparc64
/ \
288 -e s
/arm.
*/arm
/ -e s
/sa110
/arm
/ \
289 -e s
/s390x
/s390
/ -e s
/parisc64
/parisc
/ \
290 -e s
/ppc.
*/powerpc
/ -e s
/mips.
*/mips
/ \
291 -e s
/sh
[234].
*/sh
/ -e s
/aarch64.
*/arm64
/ \
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 KCONFIG_CONFIG ?
= .config
343 export KCONFIG_CONFIG
345 # SHELL used by kbuild
346 CONFIG_SHELL
:= $(shell if
[ -x
"$$BASH" ]; then echo
$$BASH; \
347 else if
[ -x
/bin
/bash
]; then echo
/bin
/bash
; \
348 else echo sh
; fi
; fi
)
350 HOST_LFS_CFLAGS
:= $(shell getconf LFS_CFLAGS
)
351 HOST_LFS_LDFLAGS
:= $(shell getconf LFS_LDFLAGS
)
352 HOST_LFS_LIBS
:= $(shell getconf LFS_LIBS
)
356 HOSTCFLAGS
:= -Wall
-Wmissing-prototypes
-Wstrict-prototypes
-O2 \
357 -fomit-frame-pointer
-std
=gnu89
$(HOST_LFS_CFLAGS
)
358 HOSTCXXFLAGS
:= -O2
$(HOST_LFS_CFLAGS
)
359 HOSTLDFLAGS
:= $(HOST_LFS_LDFLAGS
)
360 HOST_LOADLIBES
:= $(HOST_LFS_LIBS
)
362 # Make variables (CC, etc...)
363 AS
= $(CROSS_COMPILE
)as
364 LD
= $(CROSS_COMPILE
)ld
365 CC
= $(CROSS_COMPILE
)gcc
367 AR
= $(CROSS_COMPILE
)ar
368 NM
= $(CROSS_COMPILE
)nm
369 STRIP
= $(CROSS_COMPILE
)strip
370 OBJCOPY
= $(CROSS_COMPILE
)objcopy
371 OBJDUMP
= $(CROSS_COMPILE
)objdump
375 GENKSYMS
= scripts
/genksyms
/genksyms
376 INSTALLKERNEL
:= installkernel
377 DEPMOD
= /sbin
/depmod
382 CHECKFLAGS
:= -D__linux__
-Dlinux
-D__STDC__
-Dunix
-D__unix__ \
383 -Wbitwise
-Wno-return-void
-Wno-unknown-attribute
$(CF
)
392 # Use USERINCLUDE when you must reference the UAPI directories only.
394 -I
$(srctree
)/arch
/$(SRCARCH
)/include/uapi \
395 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated
/uapi \
396 -I
$(srctree
)/include/uapi \
397 -I
$(objtree
)/include/generated
/uapi \
398 -include $(srctree
)/include/linux
/kconfig.h
400 # Use LINUXINCLUDE when you must reference the include/ directory.
401 # Needed to be compatible with the O= option
403 -I
$(srctree
)/arch
/$(SRCARCH
)/include \
404 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated \
405 $(if
$(KBUILD_SRC
), -I
$(srctree
)/include) \
406 -I
$(objtree
)/include \
409 KBUILD_AFLAGS
:= -D__ASSEMBLY__
410 KBUILD_CFLAGS
:= -Wall
-Wundef
-Wstrict-prototypes
-Wno-trigraphs \
411 -fno-strict-aliasing
-fno-common
-fshort-wchar \
412 -Werror-implicit-function-declaration \
413 -Wno-format-security \
415 KBUILD_CPPFLAGS
:= -D__KERNEL__
416 KBUILD_AFLAGS_KERNEL
:=
417 KBUILD_CFLAGS_KERNEL
:=
418 KBUILD_AFLAGS_MODULE
:= -DMODULE
419 KBUILD_CFLAGS_MODULE
:= -DMODULE
420 KBUILD_LDFLAGS_MODULE
:= -T
$(srctree
)/scripts
/module-common.lds
421 GCC_PLUGINS_CFLAGS
:=
423 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
424 export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
425 export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
426 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
428 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
429 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
430 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
431 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
432 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
433 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
434 export KBUILD_ARFLAGS
436 # When compiling out-of-tree modules, put MODVERDIR in the module
437 # tree rather than in the kernel tree. The kernel tree might
439 export MODVERDIR
:= $(if
$(KBUILD_EXTMOD
),$(firstword $(KBUILD_EXTMOD
))/).tmp_versions
441 # Files to ignore in find ... statements
443 export RCS_FIND_IGNORE
:= \
( -name SCCS
-o
-name BitKeeper
-o
-name .svn
-o \
444 -name CVS
-o
-name .
pc -o
-name .hg
-o
-name .git \
) \
446 export RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn \
447 --exclude CVS
--exclude .
pc --exclude .hg
--exclude .git
449 # ===========================================================================
450 # Rules shared between *config targets and build targets
452 # Basic helpers built in scripts/basic/
453 PHONY
+= scripts_basic
455 $(Q
)$(MAKE
) $(build
)=scripts
/basic
456 $(Q
)rm -f .tmp_quiet_recordmcount
458 # To avoid any implicit rule to kick in, define an empty command.
459 scripts
/basic
/%: scripts_basic
;
461 PHONY
+= outputmakefile
462 # outputmakefile generates a Makefile in the output directory, if using a
463 # separate output directory. This allows convenient use of make in the
466 ifneq ($(KBUILD_SRC
),)
467 $(Q
)ln
-fsn
$(srctree
) source
468 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/mkmakefile \
469 $(srctree
) $(objtree
) $(VERSION
) $(PATCHLEVEL
)
472 ifeq ($(cc-name
),clang
)
473 ifneq ($(CROSS_COMPILE
),)
474 CLANG_TARGET
:= --target
=$(notdir $(CROSS_COMPILE
:%-=%))
475 GCC_TOOLCHAIN
:= $(realpath
$(dir $(shell which
$(LD
)))/..
)
477 ifneq ($(GCC_TOOLCHAIN
),)
478 CLANG_GCC_TC
:= --gcc-toolchain
=$(GCC_TOOLCHAIN
)
480 KBUILD_CFLAGS
+= $(CLANG_TARGET
) $(CLANG_GCC_TC
)
481 KBUILD_AFLAGS
+= $(CLANG_TARGET
) $(CLANG_GCC_TC
)
482 KBUILD_CFLAGS
+= $(call cc-option
, -no-integrated-as
)
483 KBUILD_AFLAGS
+= $(call cc-option
, -no-integrated-as
)
486 RETPOLINE_CFLAGS_GCC
:= -mindirect-branch
=thunk-extern
-mindirect-branch-register
487 RETPOLINE_CFLAGS_CLANG
:= -mretpoline-external-thunk
488 RETPOLINE_CFLAGS
:= $(call cc-option
,$(RETPOLINE_CFLAGS_GCC
),$(call cc-option
,$(RETPOLINE_CFLAGS_CLANG
)))
489 export RETPOLINE_CFLAGS
491 # check for 'asm goto'
492 ifeq ($(call shell-cached
,$(CONFIG_SHELL
) $(srctree
)/scripts
/gcc-goto.sh
$(CC
) $(KBUILD_CFLAGS
)), y
)
493 CC_HAVE_ASM_GOTO
:= 1
494 KBUILD_CFLAGS
+= -DCC_HAVE_ASM_GOTO
495 KBUILD_AFLAGS
+= -DCC_HAVE_ASM_GOTO
498 ifeq ($(config-targets
),1)
499 # ===========================================================================
500 # *config targets only - make sure prerequisites are updated, and descend
501 # in scripts/kconfig to make the *config target
503 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
504 # KBUILD_DEFCONFIG may point out an alternative default configuration
505 # used for 'make defconfig'
506 include arch
/$(SRCARCH
)/Makefile
507 export KBUILD_DEFCONFIG KBUILD_KCONFIG
509 config
: scripts_basic outputmakefile FORCE
510 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
512 %config
: scripts_basic outputmakefile FORCE
513 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
516 # ===========================================================================
517 # Build targets only - this includes vmlinux, arch specific targets, clean
518 # targets and others. In general all targets except *config targets.
520 # If building an external module we do not care about the all: rule
521 # but instead _all depend on modules
523 ifeq ($(KBUILD_EXTMOD
),)
529 # Decide whether to build built-in, modular, or both.
530 # Normally, just do built-in.
535 # If we have only "make modules", don't compile built-in objects.
536 # When we're building modules with modversions, we need to consider
537 # the built-in objects during the descend as well, in order to
538 # make sure the checksums are up to date before we record them.
540 ifeq ($(MAKECMDGOALS
),modules
)
541 KBUILD_BUILTIN
:= $(if
$(CONFIG_MODVERSIONS
),1)
544 # If we have "make <whatever> modules", compile modules
545 # in addition to whatever we do anyway.
546 # Just "make" or "make all" shall build modules as well
548 ifneq ($(filter all _all modules
,$(MAKECMDGOALS
)),)
552 ifeq ($(MAKECMDGOALS
),)
556 export KBUILD_MODULES KBUILD_BUILTIN
558 ifeq ($(KBUILD_EXTMOD
),)
559 # Additional helpers built in scripts/
560 # Carefully list dependencies so we do not try to build scripts twice
563 scripts
: scripts_basic
include/config
/auto.conf
include/config
/tristate.conf \
564 asm-generic gcc-plugins
565 $(Q
)$(MAKE
) $(build
)=$(@
)
567 # Objects we will link into vmlinux / subdirs we need to visit
569 drivers-y
:= drivers
/ sound
/ firmware
/
574 endif # KBUILD_EXTMOD
576 ifeq ($(dot-config
),1)
578 -include include/config
/auto.conf
580 ifeq ($(KBUILD_EXTMOD
),)
581 # Read in dependencies to all Kconfig* files, make sure to run
582 # oldconfig if changes are detected.
583 -include include/config
/auto.conf.cmd
585 # To avoid any implicit rule to kick in, define an empty command
586 $(KCONFIG_CONFIG
) include/config
/auto.conf.cmd
: ;
588 # The actual configuration files used during the build are stored in
589 # include/generated/ and include/config/. Update them if .config is newer than
590 # include/config/auto.conf (which mirrors .config).
591 include/config
/%.conf
: $(KCONFIG_CONFIG
) include/config
/auto.conf.cmd
592 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile silentoldconfig
594 # external modules needs include/generated/autoconf.h and include/config/auto.conf
595 # but do not care if they are up-to-date. Use auto.conf to trigger the test
596 PHONY
+= include/config
/auto.conf
598 include/config
/auto.conf
:
599 $(Q
)test -e
include/generated
/autoconf.h
-a
-e
$@ ||
( \
601 echo
>&2 " ERROR: Kernel configuration is invalid."; \
602 echo
>&2 " include/generated/autoconf.h or $@ are missing.";\
603 echo
>&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
607 endif # KBUILD_EXTMOD
610 # Dummy target needed, because used as prerequisite
611 include/config
/auto.conf
: ;
612 endif # $(dot-config)
614 # For the kernel to actually contain only the needed exported symbols,
615 # we have to build modules as well to determine what those symbols are.
616 # (this can be evaluated only once include/config/auto.conf has been included)
617 ifdef CONFIG_TRIM_UNUSED_KSYMS
621 # The all: target is the default when no target is given on the
623 # This allow a user to issue only 'make' to build a kernel including modules
624 # Defaults to vmlinux, but the arch makefile usually adds further targets
627 KBUILD_CFLAGS
+= $(call cc-option
,-fno-PIE
)
628 KBUILD_AFLAGS
+= $(call cc-option
,-fno-PIE
)
629 CFLAGS_GCOV
:= -fprofile-arcs
-ftest-coverage
-fno-tree-loop-im
$(call cc-disable-warning
,maybe-uninitialized
,)
630 export CFLAGS_GCOV CFLAGS_KCOV
632 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
633 # values of the respective KBUILD_* variables
637 include arch
/$(SRCARCH
)/Makefile
639 KBUILD_CFLAGS
+= $(call cc-option
,-fno-delete-null-pointer-checks
,)
640 KBUILD_CFLAGS
+= $(call cc-disable-warning
,frame-address
,)
641 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-truncation
)
642 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-overflow
)
643 KBUILD_CFLAGS
+= $(call cc-disable-warning
, int-in-bool-context
)
645 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
646 KBUILD_CFLAGS
+= $(call cc-option
,-Oz
,-Os
)
647 KBUILD_CFLAGS
+= $(call cc-disable-warning
,maybe-uninitialized
,)
649 ifdef CONFIG_PROFILE_ALL_BRANCHES
650 KBUILD_CFLAGS
+= -O2
$(call cc-disable-warning
,maybe-uninitialized
,)
656 KBUILD_CFLAGS
+= $(call cc-ifversion
, -lt
, 0409, \
657 $(call cc-disable-warning
,maybe-uninitialized
,))
659 # Tell gcc to never replace conditional load with a non-conditional one
660 KBUILD_CFLAGS
+= $(call cc-option
,--param
=allow-store-data-races
=0)
662 include scripts
/Makefile.kcov
663 include scripts
/Makefile.gcc-plugins
665 ifdef CONFIG_READABLE_ASM
666 # Disable optimizations that make assembler listings hard to read.
667 # reorder blocks reorders the control in the function
668 # ipa clone creates specialized cloned functions
669 # partial inlining inlines only parts of functions
670 KBUILD_CFLAGS
+= $(call cc-option
,-fno-reorder-blocks
,) \
671 $(call cc-option
,-fno-ipa-cp-clone
,) \
672 $(call cc-option
,-fno-partial-inlining
)
675 ifneq ($(CONFIG_FRAME_WARN
),0)
676 KBUILD_CFLAGS
+= $(call cc-option
,-Wframe-larger-than
=${CONFIG_FRAME_WARN})
679 # This selects the stack protector compiler flag. Testing it is delayed
680 # until after .config has been reprocessed, in the prepare-compiler-check
682 ifdef CONFIG_CC_STACKPROTECTOR_AUTO
683 stackp-flag
:= $(call cc-option
,-fstack-protector-strong
,$(call cc-option
,-fstack-protector
))
686 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
687 stackp-flag
:= -fstack-protector
688 stackp-name
:= REGULAR
690 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
691 stackp-flag
:= -fstack-protector-strong
692 stackp-name
:= STRONG
694 # If either there is no stack protector for this architecture or
695 # CONFIG_CC_STACKPROTECTOR_NONE is selected, we're done, and $(stackp-name)
696 # is empty, skipping all remaining stack protector tests.
698 # Force off for distro compilers that enable stack protector by default.
699 KBUILD_CFLAGS
+= $(call cc-option
, -fno-stack-protector
)
703 # Find arch-specific stack protector compiler sanity-checking script.
705 ifneq ($(stackp-flag
),)
706 stackp-path
:= $(srctree
)/scripts
/gcc-
$(SRCARCH
)_
$(BITS
)-has-stack-protector.sh
707 stackp-check
:= $(wildcard $(stackp-path
))
708 # If the wildcard test matches a test script, run it to check functionality.
710 ifneq ($(shell $(CONFIG_SHELL
) $(stackp-check
) $(CC
) $(KBUILD_CPPFLAGS
) $(biarch
)),y
)
715 # If the stack protector is functional, enable code that depends on it.
716 KBUILD_CPPFLAGS
+= -DCONFIG_CC_STACKPROTECTOR
717 # Either we've already detected the flag (for AUTO) or we'll fail the
718 # build in the prepare-compiler-check rule (for specific flag).
719 KBUILD_CFLAGS
+= $(stackp-flag
)
721 # We have to make sure stack protector is unconditionally disabled if
722 # the compiler is broken (in case we're going to continue the build in
724 KBUILD_CFLAGS
+= $(call cc-option
, -fno-stack-protector
)
729 ifeq ($(cc-name
),clang
)
730 KBUILD_CPPFLAGS
+= $(call cc-option
,-Qunused-arguments
,)
731 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-invalid-specifier
)
732 KBUILD_CFLAGS
+= $(call cc-disable-warning
, gnu
)
733 KBUILD_CFLAGS
+= $(call cc-disable-warning
, address-of-packed-member
)
734 # Quiet clang warning: comparison of unsigned expression < 0 is always false
735 KBUILD_CFLAGS
+= $(call cc-disable-warning
, tautological-compare
)
736 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
737 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
738 # See modpost pattern 2
739 KBUILD_CFLAGS
+= $(call cc-option
, -mno-global-merge
,)
740 KBUILD_CFLAGS
+= $(call cc-option
, -fcatch-undefined-behavior
)
743 # These warnings generated too much noise in a regular build.
744 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
745 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-but-set-variable
)
748 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-const-variable
)
749 ifdef CONFIG_FRAME_POINTER
750 KBUILD_CFLAGS
+= -fno-omit-frame-pointer
-fno-optimize-sibling-calls
752 # Some targets (ARM with Thumb2, for example), can't be built with frame
753 # pointers. For those, we don't have FUNCTION_TRACER automatically
754 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
755 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
756 # -fomit-frame-pointer with FUNCTION_TRACER.
757 ifndef CONFIG_FUNCTION_TRACER
758 KBUILD_CFLAGS
+= -fomit-frame-pointer
762 KBUILD_CFLAGS
+= $(call cc-option
, -fno-var-tracking-assignments
)
764 ifdef CONFIG_DEBUG_INFO
765 ifdef CONFIG_DEBUG_INFO_SPLIT
766 KBUILD_CFLAGS
+= $(call cc-option
, -gsplit-dwarf
, -g
)
770 KBUILD_AFLAGS
+= -Wa
,-gdwarf-2
772 ifdef CONFIG_DEBUG_INFO_DWARF4
773 KBUILD_CFLAGS
+= $(call cc-option
, -gdwarf-4
,)
776 ifdef CONFIG_DEBUG_INFO_REDUCED
777 KBUILD_CFLAGS
+= $(call cc-option
, -femit-struct-debug-baseonly
) \
778 $(call cc-option
,-fno-var-tracking
)
781 ifdef CONFIG_FUNCTION_TRACER
782 ifndef CC_FLAGS_FTRACE
783 CC_FLAGS_FTRACE
:= -pg
785 export CC_FLAGS_FTRACE
786 ifdef CONFIG_HAVE_FENTRY
787 CC_USING_FENTRY
:= $(call cc-option
, -mfentry
-DCC_USING_FENTRY
)
789 KBUILD_CFLAGS
+= $(CC_FLAGS_FTRACE
) $(CC_USING_FENTRY
)
790 KBUILD_AFLAGS
+= $(CC_USING_FENTRY
)
791 ifdef CONFIG_DYNAMIC_FTRACE
792 ifdef CONFIG_HAVE_C_RECORDMCOUNT
793 BUILD_C_RECORDMCOUNT
:= y
794 export BUILD_C_RECORDMCOUNT
799 # We trigger additional mismatches with less inlining
800 ifdef CONFIG_DEBUG_SECTION_MISMATCH
801 KBUILD_CFLAGS
+= $(call cc-option
, -fno-inline-functions-called-once
)
804 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
805 KBUILD_CFLAGS
+= $(call cc-option
,-ffunction-sections
,)
806 KBUILD_CFLAGS
+= $(call cc-option
,-fdata-sections
,)
809 # arch Makefile may override CC so keep this after arch Makefile is included
810 NOSTDINC_FLAGS
+= -nostdinc
-isystem
$(call shell-cached
,$(CC
) -print-file-name
=include)
811 CHECKFLAGS
+= $(NOSTDINC_FLAGS
)
813 # warn about C99 declaration after statement
814 KBUILD_CFLAGS
+= $(call cc-option
,-Wdeclaration-after-statement
,)
816 # disable pointer signed / unsigned warnings in gcc 4.0
817 KBUILD_CFLAGS
+= $(call cc-disable-warning
, pointer-sign
)
819 # disable invalid "can't wrap" optimizations for signed / pointers
820 KBUILD_CFLAGS
+= $(call cc-option
,-fno-strict-overflow
)
822 # clang sets -fmerge-all-constants by default as optimization, but this
823 # is non-conforming behavior for C and in fact breaks the kernel, so we
824 # need to disable it here generally.
825 KBUILD_CFLAGS
+= $(call cc-option
,-fno-merge-all-constants
)
827 # for gcc -fno-merge-all-constants disables everything, but it is fine
828 # to have actual conforming behavior enabled.
829 KBUILD_CFLAGS
+= $(call cc-option
,-fmerge-constants
)
831 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
832 KBUILD_CFLAGS
+= $(call cc-option
,-fno-stack-check
,)
834 # conserve stack if available
835 KBUILD_CFLAGS
+= $(call cc-option
,-fconserve-stack
)
837 # disallow errors like 'EXPORT_GPL(foo);' with missing header
838 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=implicit-int
)
840 # require functions to have arguments in prototypes, not empty 'int foo()'
841 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=strict-prototypes
)
843 # Prohibit date/time macros, which would make the build non-deterministic
844 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=date-time
)
846 # enforce correct pointer usage
847 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=incompatible-pointer-types
)
849 # Require designated initializers for all marked structures
850 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=designated-init
)
852 # use the deterministic mode of AR if available
853 KBUILD_ARFLAGS
:= $(call ar-option
,D
)
855 include scripts
/Makefile.kasan
856 include scripts
/Makefile.extrawarn
857 include scripts
/Makefile.ubsan
859 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
861 KBUILD_CPPFLAGS
+= $(ARCH_CPPFLAGS
) $(KCPPFLAGS
)
862 KBUILD_AFLAGS
+= $(ARCH_AFLAGS
) $(KAFLAGS
)
863 KBUILD_CFLAGS
+= $(ARCH_CFLAGS
) $(KCFLAGS
)
865 # Use --build-id when available.
866 LDFLAGS_BUILD_ID
:= $(call ld-option
, --build-id
)
867 KBUILD_LDFLAGS_MODULE
+= $(LDFLAGS_BUILD_ID
)
868 LDFLAGS_vmlinux
+= $(LDFLAGS_BUILD_ID
)
870 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
871 LDFLAGS_vmlinux
+= $(call ld-option
, --gc-sections
,)
874 ifeq ($(CONFIG_STRIP_ASM_SYMS
),y
)
875 LDFLAGS_vmlinux
+= $(call ld-option
, -X
,)
878 # Default kernel image to build when no specific target is given.
879 # KBUILD_IMAGE may be overruled on the command line or
880 # set in the environment
881 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
883 export KBUILD_IMAGE ?
= vmlinux
886 # INSTALL_PATH specifies where to place the updated kernel and system map
887 # images. Default is /boot, but you can set it to other values
888 export INSTALL_PATH ?
= /boot
891 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
892 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
893 # an argument if needed. Otherwise it defaults to the kernel install path
895 export INSTALL_DTBS_PATH ?
= $(INSTALL_PATH
)/dtbs
/$(KERNELRELEASE
)
898 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
899 # relocations required by build roots. This is not defined in the
900 # makefile but the argument can be passed to make if needed.
903 MODLIB
= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
907 # INSTALL_MOD_STRIP, if defined, will cause modules to be
908 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
909 # the default option --strip-debug will be used. Otherwise,
910 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
912 ifdef INSTALL_MOD_STRIP
913 ifeq ($(INSTALL_MOD_STRIP
),1)
914 mod_strip_cmd
= $(STRIP
) --strip-debug
916 mod_strip_cmd
= $(STRIP
) $(INSTALL_MOD_STRIP
)
917 endif # INSTALL_MOD_STRIP=1
920 endif # INSTALL_MOD_STRIP
923 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
924 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
925 # or CONFIG_MODULE_COMPRESS_XZ.
927 mod_compress_cmd
= true
928 ifdef CONFIG_MODULE_COMPRESS
929 ifdef CONFIG_MODULE_COMPRESS_GZIP
930 mod_compress_cmd
= gzip
-n
-f
931 endif # CONFIG_MODULE_COMPRESS_GZIP
932 ifdef CONFIG_MODULE_COMPRESS_XZ
933 mod_compress_cmd
= xz
-f
934 endif # CONFIG_MODULE_COMPRESS_XZ
935 endif # CONFIG_MODULE_COMPRESS
936 export mod_compress_cmd
938 # Select initial ramdisk compression format, default is gzip(1).
939 # This shall be used by the dracut(8) tool while creating an initramfs image.
941 INITRD_COMPRESS-y
:= gzip
942 INITRD_COMPRESS-
$(CONFIG_RD_BZIP2
) := bzip2
943 INITRD_COMPRESS-
$(CONFIG_RD_LZMA
) := lzma
944 INITRD_COMPRESS-
$(CONFIG_RD_XZ
) := xz
945 INITRD_COMPRESS-
$(CONFIG_RD_LZO
) := lzo
946 INITRD_COMPRESS-
$(CONFIG_RD_LZ4
) := lz4
947 # do not export INITRD_COMPRESS, since we didn't actually
948 # choose a sane default compression above.
949 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
951 ifdef CONFIG_MODULE_SIG_ALL
952 $(eval
$(call config_filename
,MODULE_SIG_KEY
))
954 mod_sign_cmd
= scripts
/sign-file
$(CONFIG_MODULE_SIG_HASH
) $(MODULE_SIG_KEY_SRCPREFIX
)$(CONFIG_MODULE_SIG_KEY
) certs
/signing_key.x509
960 ifdef CONFIG_STACK_VALIDATION
961 has_libelf
:= $(call try-run
,\
962 echo
"int main() {}" |
$(HOSTCC
) -xc
-o
/dev
/null
-lelf
-,1,0)
963 ifeq ($(has_libelf
),1)
964 objtool_target
:= tools
/objtool FORCE
966 ifdef CONFIG_UNWINDER_ORC
967 $(error
"Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
969 $(warning
"Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
971 SKIP_STACK_VALIDATION
:= 1
972 export SKIP_STACK_VALIDATION
977 ifeq ($(KBUILD_EXTMOD
),)
978 core-y
+= kernel
/ certs
/ mm
/ fs
/ ipc
/ security
/ crypto
/ block
/
980 vmlinux-dirs
:= $(patsubst %/,%,$(filter %/, $(init-y
) $(init-m
) \
981 $(core-y
) $(core-m
) $(drivers-y
) $(drivers-m
) \
982 $(net-y
) $(net-m
) $(libs-y
) $(libs-m
) $(virt-y
)))
984 vmlinux-alldirs
:= $(sort $(vmlinux-dirs
) $(patsubst %/,%,$(filter %/, \
985 $(init-
) $(core-
) $(drivers-
) $(net-
) $(libs-
) $(virt-
))))
987 init-y
:= $(patsubst %/, %/built-in.o
, $(init-y
))
988 core-y
:= $(patsubst %/, %/built-in.o
, $(core-y
))
989 drivers-y
:= $(patsubst %/, %/built-in.o
, $(drivers-y
))
990 net-y
:= $(patsubst %/, %/built-in.o
, $(net-y
))
991 libs-y1
:= $(patsubst %/, %/lib.a
, $(libs-y
))
992 libs-y2
:= $(filter-out %.a
, $(patsubst %/, %/built-in.o
, $(libs-y
)))
993 virt-y
:= $(patsubst %/, %/built-in.o
, $(virt-y
))
995 # Externally visible symbols (used by link-vmlinux.sh)
996 export KBUILD_VMLINUX_INIT
:= $(head-y
) $(init-y
)
997 export KBUILD_VMLINUX_MAIN
:= $(core-y
) $(libs-y2
) $(drivers-y
) $(net-y
) $(virt-y
)
998 export KBUILD_VMLINUX_LIBS
:= $(libs-y1
)
999 export KBUILD_LDS
:= arch
/$(SRCARCH
)/kernel
/vmlinux.lds
1000 export LDFLAGS_vmlinux
1001 # used by scripts/package/Makefile
1002 export KBUILD_ALLDIRS
:= $(sort $(filter-out arch
/%,$(vmlinux-alldirs
)) arch Documentation
include samples scripts tools
)
1004 vmlinux-deps
:= $(KBUILD_LDS
) $(KBUILD_VMLINUX_INIT
) $(KBUILD_VMLINUX_MAIN
) $(KBUILD_VMLINUX_LIBS
)
1006 # Include targets which we want to execute sequentially if the rest of the
1007 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
1008 # evaluated more than once.
1009 PHONY
+= vmlinux_prereq
1010 vmlinux_prereq
: $(vmlinux-deps
) FORCE
1011 ifdef CONFIG_HEADERS_CHECK
1012 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile headers_check
1014 ifdef CONFIG_GDB_SCRIPTS
1015 $(Q
)ln
-fsn
$(abspath
$(srctree
)/scripts
/gdb
/vmlinux-gdb.py
)
1017 ifdef CONFIG_TRIM_UNUSED_KSYMS
1018 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/adjust_autoksyms.sh \
1019 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1022 # standalone target for easier testing
1023 include/generated
/autoksyms.h
: FORCE
1024 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/adjust_autoksyms.sh true
1026 ARCH_POSTLINK
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/Makefile.postlink
)
1028 # Final link of vmlinux with optional arch pass after final link
1029 cmd_link-vmlinux
= \
1030 $(CONFIG_SHELL
) $< $(LD
) $(LDFLAGS
) $(LDFLAGS_vmlinux
) ; \
1031 $(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) $@
, true
)
1033 vmlinux
: scripts
/link-vmlinux.sh vmlinux_prereq
$(vmlinux-deps
) FORCE
1034 +$(call if_changed
,link-vmlinux
)
1036 # Build samples along the rest of the kernel
1037 ifdef CONFIG_SAMPLES
1038 vmlinux-dirs
+= samples
1041 # The actual objects are generated when descending,
1042 # make sure no implicit rule kicks in
1043 $(sort $(vmlinux-deps
)): $(vmlinux-dirs
) ;
1045 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1046 # Preset locale variables to speed up the build process. Limit locale
1047 # tweaks to this spot to avoid wrong language settings when running
1048 # make menuconfig etc.
1049 # Error messages still appears in the original language
1051 PHONY
+= $(vmlinux-dirs
)
1052 $(vmlinux-dirs
): prepare scripts
1053 $(Q
)$(MAKE
) $(build
)=$@ need-builtin
=1
1055 define filechk_kernel.release
1056 echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1059 # Store (new) KERNELRELEASE string in include/config/kernel.release
1060 include/config
/kernel.release
: include/config
/auto.conf FORCE
1061 $(call filechk
,kernel.release
)
1064 # Things we need to do before we recursively start building the kernel
1065 # or the modules are listed in "prepare".
1066 # A multi level approach is used. prepareN is processed before prepareN-1.
1067 # archprepare is used in arch Makefiles and when processed asm symlink,
1068 # version.h and scripts_basic is processed / created.
1070 # Listed in dependency order
1071 PHONY
+= prepare archprepare prepare0 prepare1 prepare2 prepare3
1073 # prepare3 is used to check if we are building in a separate output directory,
1075 # 1) Check that make has not been executed in the kernel src $(srctree)
1076 prepare3
: include/config
/kernel.release
1077 ifneq ($(KBUILD_SRC
),)
1078 @
$(kecho
) ' Using $(srctree) as source for kernel'
1079 $(Q
)if
[ -f
$(srctree
)/.config
-o
-d
$(srctree
)/include/config
]; then \
1080 echo
>&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1081 echo
>&2 " in the '$(srctree)' directory.";\
1086 # prepare2 creates a makefile if using a separate output directory.
1087 # From this point forward, .config has been reprocessed, so any rules
1088 # that need to depend on updated CONFIG_* values can be checked here.
1089 prepare2
: prepare3 prepare-compiler-check outputmakefile asm-generic
1091 prepare1
: prepare2
$(version_h
) include/generated
/utsrelease.h \
1092 include/config
/auto.conf
1095 archprepare
: archheaders archscripts prepare1 scripts_basic
1097 prepare0
: archprepare gcc-plugins
1098 $(Q
)$(MAKE
) $(build
)=.
1100 # All the preparing..
1101 prepare
: prepare0 prepare-objtool
1103 # Support for using generic headers in asm-generic
1104 PHONY
+= asm-generic uapi-asm-generic
1105 asm-generic
: uapi-asm-generic
1106 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.asm-generic \
1107 src
=asm obj
=arch
/$(SRCARCH
)/include/generated
/asm
1109 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.asm-generic \
1110 src
=uapi
/asm obj
=arch
/$(SRCARCH
)/include/generated
/uapi
/asm
1112 PHONY
+= prepare-objtool
1113 prepare-objtool
: $(objtool_target
)
1115 # Check for CONFIG flags that require compiler support. Abort the build
1116 # after .config has been processed, but before the kernel build starts.
1118 # For security-sensitive CONFIG options, we don't want to fallback and/or
1119 # silently change which compiler flags will be used, since that leads to
1120 # producing kernels with different security feature characteristics
1121 # depending on the compiler used. (For example, "But I selected
1122 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1123 PHONY
+= prepare-compiler-check
1124 prepare-compiler-check
: FORCE
1125 # Make sure compiler supports requested stack protector flag.
1127 # Warn about CONFIG_CC_STACKPROTECTOR_AUTO having found no option.
1128 ifeq ($(stackp-flag
),)
1129 @echo CONFIG_CC_STACKPROTECTOR_
$(stackp-name
): \
1130 Compiler does not support any known stack-protector
>&2
1132 # Fail if specifically requested stack protector is missing.
1133 ifeq ($(call cc-option
, $(stackp-flag
)),)
1134 @echo Cannot use CONFIG_CC_STACKPROTECTOR_
$(stackp-name
): \
1135 $(stackp-flag
) not supported by compiler
>&2 && exit
1
1139 # Make sure compiler does not have buggy stack-protector support. If a
1140 # specific stack-protector was requested, fail the build, otherwise warn.
1142 ifeq ($(stackp-name
),AUTO
)
1143 @echo CONFIG_CC_STACKPROTECTOR_
$(stackp-name
): \
1144 $(stackp-flag
) available but compiler is broken
: disabling
>&2
1146 @echo Cannot use CONFIG_CC_STACKPROTECTOR_
$(stackp-name
): \
1147 $(stackp-flag
) available but compiler is broken
>&2 && exit
1
1152 # Generate some files
1153 # ---------------------------------------------------------------------------
1155 # KERNELRELEASE can change from a few different places, meaning version.h
1156 # needs to be updated, so this check is forced on all builds
1159 define filechk_utsrelease.h
1160 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
1161 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1164 (echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1167 define filechk_version.h
1168 (echo \
#define LINUX_VERSION_CODE $(shell \
1169 expr
$(VERSION
) \
* 65536 + 0$(PATCHLEVEL
) \
* 256 + 0$(SUBLEVEL
)); \
1170 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1173 $(version_h
): $(srctree
)/Makefile FORCE
1174 $(call filechk
,version.h
)
1175 $(Q
)rm -f
$(old_version_h
)
1177 include/generated
/utsrelease.h
: include/config
/kernel.release FORCE
1178 $(call filechk
,utsrelease.h
)
1182 $(Q
)find
$(srctree
)/include/ -name
'*.h' | xargs
--max-args
1 \
1183 $(srctree
)/scripts
/headerdep.pl
-I
$(srctree
)/include
1185 # ---------------------------------------------------------------------------
1188 #Default location for installed headers
1189 export INSTALL_HDR_PATH
= $(objtree
)/usr
1191 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1192 hdr-dst
= $(if
$(KBUILD_HEADERS
), dst
=include/arch-
$(SRCARCH
), dst
=include)
1194 PHONY
+= archheaders
1197 PHONY
+= archscripts
1201 __headers
: $(version_h
) scripts_basic uapi-asm-generic archheaders archscripts
1202 $(Q
)$(MAKE
) $(build
)=scripts build_unifdef
1204 PHONY
+= headers_install_all
1205 headers_install_all
:
1206 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
install
1208 PHONY
+= headers_install
1209 headers_install
: __headers
1210 $(if
$(wildcard $(srctree
)/arch
/$(SRCARCH
)/include/uapi
/asm
/Kbuild
),, \
1211 $(error Headers not exportable for the
$(SRCARCH
) architecture
))
1212 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi dst
=include
1213 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(SRCARCH
)/include/uapi
$(hdr-dst
)
1215 PHONY
+= headers_check_all
1216 headers_check_all
: headers_install_all
1217 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
check
1219 PHONY
+= headers_check
1220 headers_check
: headers_install
1221 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi dst
=include HDRCHECK
=1
1222 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(SRCARCH
)/include/uapi
$(hdr-dst
) HDRCHECK
=1
1224 # ---------------------------------------------------------------------------
1229 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests run_tests
1231 PHONY
+= kselftest-clean
1233 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests
clean
1235 PHONY
+= kselftest-merge
1237 $(if
$(wildcard $(objtree
)/.config
),, $(error No .config exists
, config your kernel first
!))
1238 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/kconfig
/merge_config.sh \
1239 -m
$(objtree
)/.config \
1240 $(srctree
)/tools
/testing
/selftests
/*/config
1241 +$(Q
)$(MAKE
) -f
$(srctree
)/Makefile olddefconfig
1243 # ---------------------------------------------------------------------------
1246 ifdef CONFIG_MODULES
1248 # By default, build modules as well
1254 # A module can be listed more than once in obj-m resulting in
1255 # duplicate lines in modules.order files. Those are removed
1256 # using awk while concatenating to the final file.
1259 modules
: $(vmlinux-dirs
) $(if
$(KBUILD_BUILTIN
),vmlinux
) modules.builtin
1260 $(Q
)$(AWK
) '!x[$$0]++' $(vmlinux-dirs
:%=$(objtree
)/%/modules.order
) > $(objtree
)/modules.order
1261 @
$(kecho
) ' Building modules, stage 2.';
1262 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1264 modules.builtin
: $(vmlinux-dirs
:%=%/modules.builtin
)
1265 $(Q
)$(AWK
) '!x[$$0]++' $^
> $(objtree
)/modules.builtin
1267 %/modules.builtin
: include/config
/auto.conf
1268 $(Q
)$(MAKE
) $(modbuiltin
)=$*
1271 # Target to prepare building external modules
1272 PHONY
+= modules_prepare
1273 modules_prepare
: prepare scripts
1275 # Target to install modules
1276 PHONY
+= modules_install
1277 modules_install
: _modinst_ _modinst_post
1281 @
rm -rf
$(MODLIB
)/kernel
1282 @
rm -f
$(MODLIB
)/source
1283 @mkdir
-p
$(MODLIB
)/kernel
1284 @ln
-s
$(abspath
$(srctree
)) $(MODLIB
)/source
1285 @if
[ ! $(objtree
) -ef
$(MODLIB
)/build
]; then \
1286 rm -f
$(MODLIB
)/build
; \
1287 ln
-s
$(CURDIR
) $(MODLIB
)/build
; \
1289 @cp
-f
$(objtree
)/modules.order
$(MODLIB
)/
1290 @cp
-f
$(objtree
)/modules.builtin
$(MODLIB
)/
1291 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1293 # This depmod is only for convenience to give the initial
1294 # boot a modules.dep even before / is mounted read-write. However the
1295 # boot script depmod is the master version.
1296 PHONY
+= _modinst_post
1297 _modinst_post
: _modinst_
1300 ifeq ($(CONFIG_MODULE_SIG
), y
)
1301 PHONY
+= modules_sign
1303 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modsign
1306 else # CONFIG_MODULES
1308 # Modules not configured
1309 # ---------------------------------------------------------------------------
1311 PHONY
+= modules modules_install
1312 modules modules_install
:
1314 @echo
>&2 "The present kernel configuration has modules disabled."
1315 @echo
>&2 "Type 'make config' and enable loadable module support."
1316 @echo
>&2 "Then build a kernel with module support enabled."
1320 endif # CONFIG_MODULES
1323 # Cleaning is done on three levels.
1324 # make clean Delete most generated files
1325 # Leave enough to build external modules
1326 # make mrproper Delete the current configuration, and all generated files
1327 # make distclean Remove editor backup files, patch leftover files and the like
1329 # Directories & files removed with 'make clean'
1330 CLEAN_DIRS
+= $(MODVERDIR
)
1332 # Directories & files removed with 'make mrproper'
1333 MRPROPER_DIRS
+= include/config usr
/include include/generated \
1334 arch
/*/include/generated .tmp_objdiff
1335 MRPROPER_FILES
+= .config .config.old .version \
1336 Module.symvers
tags TAGS cscope
* GPATH GTAGS GRTAGS GSYMS \
1337 signing_key.pem signing_key.priv signing_key.x509 \
1338 x509.genkey extra_certificates signing_key.x509.keyid \
1339 signing_key.x509.signer vmlinux-gdb.py
1341 # clean - Delete most, but leave enough to build external modules
1343 clean: rm-dirs
:= $(CLEAN_DIRS
)
1344 clean: rm-files
:= $(CLEAN_FILES
)
1345 clean-dirs
:= $(addprefix _clean_
, .
$(vmlinux-alldirs
) Documentation samples
)
1347 PHONY
+= $(clean-dirs
) clean archclean vmlinuxclean
1349 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1352 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/link-vmlinux.sh
clean
1353 $(Q
)$(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) clean)
1355 clean: archclean vmlinuxclean
1357 # mrproper - Delete all generated files, including .config
1359 mrproper
: rm-dirs
:= $(wildcard $(MRPROPER_DIRS
))
1360 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
1361 mrproper-dirs
:= $(addprefix _mrproper_
,scripts
)
1363 PHONY
+= $(mrproper-dirs
) mrproper archmrproper
1365 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
1367 mrproper
: clean archmrproper
$(mrproper-dirs
)
1376 @find
$(srctree
) $(RCS_FIND_IGNORE
) \
1377 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
1378 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'*%' \
1379 -o
-name
'core' \
) \
1380 -type f
-print | xargs
rm -f
1383 # Packaging of the kernel to various formats
1384 # ---------------------------------------------------------------------------
1385 # rpm target kept for backward compatibility
1386 package-dir
:= scripts
/package
1389 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1390 %pkg
: include/config
/kernel.release FORCE
1391 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1393 @echo
" WARNING: \"rpm\" target will be removed after Linux 4.18"
1394 @echo
" Please use \"rpm-pkg\" instead."
1397 # Brief documentation of the typical targets used
1398 # ---------------------------------------------------------------------------
1400 boards
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*_defconfig
)
1401 boards
:= $(sort $(notdir $(boards
)))
1402 board-dirs
:= $(dir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*/*_defconfig
))
1403 board-dirs
:= $(sort $(notdir $(board-dirs
:/=)))
1407 @echo
'Cleaning targets:'
1408 @echo
' clean - Remove most generated files but keep the config and'
1409 @echo
' enough build support to build external modules'
1410 @echo
' mrproper - Remove all generated files + config + various backup files'
1411 @echo
' distclean - mrproper + remove editor backup and patch files'
1413 @echo
'Configuration targets:'
1414 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
1416 @echo
'Other generic targets:'
1417 @echo
' all - Build all targets marked with [*]'
1418 @echo
'* vmlinux - Build the bare kernel'
1419 @echo
'* modules - Build all modules'
1420 @echo
' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1421 @echo
' dir/ - Build all files in dir and below'
1422 @echo
' dir/file.[ois] - Build specified target only'
1423 @echo
' dir/file.ll - Build the LLVM assembly file'
1424 @echo
' (requires compiler support for LLVM assembly generation)'
1425 @echo
' dir/file.lst - Build specified mixed source/assembly target only'
1426 @echo
' (requires a recent binutils and recent build (System.map))'
1427 @echo
' dir/file.ko - Build module including final link'
1428 @echo
' modules_prepare - Set up for building external modules'
1429 @echo
' tags/TAGS - Generate tags file for editors'
1430 @echo
' cscope - Generate cscope index'
1431 @echo
' gtags - Generate GNU GLOBAL index'
1432 @echo
' kernelrelease - Output the release version string (use with make -s)'
1433 @echo
' kernelversion - Output the version stored in Makefile (use with make -s)'
1434 @echo
' image_name - Output the image name (use with make -s)'
1435 @echo
' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1436 echo
' (default: $(INSTALL_HDR_PATH))'; \
1438 @echo
'Static analysers:'
1439 @echo
' checkstack - Generate a list of stack hogs'
1440 @echo
' namespacecheck - Name space analysis on compiled kernel'
1441 @echo
' versioncheck - Sanity check on version.h usage'
1442 @echo
' includecheck - Check for duplicate included header files'
1443 @echo
' export_report - List the usages of all exported symbols'
1444 @echo
' headers_check - Sanity check on exported headers'
1445 @echo
' headerdep - Detect inclusion cycles in headers'
1446 @echo
' coccicheck - Check with Coccinelle'
1448 @echo
'Kernel selftest:'
1449 @echo
' kselftest - Build and run kernel selftest (run as root)'
1450 @echo
' Build, install, and boot kernel before'
1451 @echo
' running kselftest on it'
1452 @echo
' kselftest-clean - Remove all generated kselftest files'
1453 @echo
' kselftest-merge - Merge all the config dependencies of kselftest to existing'
1456 @echo
'Userspace tools targets:'
1457 @echo
' use "make tools/help"'
1458 @echo
' or "cd tools; make help"'
1460 @echo
'Kernel packaging:'
1461 @
$(MAKE
) $(build
)=$(package-dir
) help
1463 @echo
'Documentation targets:'
1464 @
$(MAKE
) -f
$(srctree
)/Documentation
/Makefile dochelp
1466 @echo
'Architecture specific targets ($(SRCARCH)):'
1467 @
$(if
$(archhelp
),$(archhelp
),\
1468 echo
' No architecture specific help defined for $(SRCARCH)')
1471 $(foreach b
, $(boards
), \
1472 printf
" %-24s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
1474 @
$(if
$(board-dirs
), \
1475 $(foreach b
, $(board-dirs
), \
1476 printf
" %-16s - Show %s-specific targets\\n" help-
$(b
) $(b
);) \
1477 printf
" %-16s - Show all of the above\\n" help-boards
; \
1480 @echo
' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1481 @echo
' make V=2 [targets] 2 => give reason for rebuild of target'
1482 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
1483 @echo
' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1484 @echo
' make C=2 [targets] Force check of all c source with $$CHECK'
1485 @echo
' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1486 @echo
' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1487 @echo
' 1: warnings which may be relevant and do not occur too often'
1488 @echo
' 2: warnings which occur quite often but may still be relevant'
1489 @echo
' 3: more obscure warnings, can most likely be ignored'
1490 @echo
' Multiple levels can be combined with W=12 or W=123'
1492 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
1493 @echo
'For further info see the ./README file'
1496 help-board-dirs
:= $(addprefix help-
,$(board-dirs
))
1498 help-boards
: $(help-board-dirs
)
1500 boards-per-dir
= $(sort $(notdir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/$*/*_defconfig
)))
1502 $(help-board-dirs
): help-
%:
1503 @echo
'Architecture specific targets ($(SRCARCH) $*):'
1504 @
$(if
$(boards-per-dir
), \
1505 $(foreach b
, $(boards-per-dir
), \
1506 printf
" %-24s - Build for %s\\n" $*/$(b
) $(subst _defconfig
,,$(b
));) \
1510 # Documentation targets
1511 # ---------------------------------------------------------------------------
1512 DOC_TARGETS
:= xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1513 linkcheckdocs dochelp refcheckdocs
1514 PHONY
+= $(DOC_TARGETS
)
1515 $(DOC_TARGETS
): scripts_basic FORCE
1516 $(Q
)$(MAKE
) $(build
)=Documentation
$@
1518 else # KBUILD_EXTMOD
1521 # External module support.
1522 # When building external modules the kernel used as basis is considered
1523 # read-only, and no consistency checks are made and the make
1524 # system is not used on the basis kernel. If updates are required
1525 # in the basis kernel ordinary make commands (without M=...) must
1528 # The following are the only valid targets when building external
1530 # make M=dir clean Delete all automatically generated files
1531 # make M=dir modules Make all modules in specified dir
1532 # make M=dir Same as 'make M=dir modules'
1533 # make M=dir modules_install
1534 # Install the modules built in the module directory
1535 # Assumes install directory is already created
1537 # We are always building modules
1539 PHONY
+= crmodverdir
1543 PHONY
+= $(objtree
)/Module.symvers
1544 $(objtree
)/Module.symvers
:
1545 @
test -e
$(objtree
)/Module.symvers ||
( \
1547 echo
" WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1548 echo
" is missing; modules will have no dependencies and modversions."; \
1551 module-dirs
:= $(addprefix _module_
,$(KBUILD_EXTMOD
))
1552 PHONY
+= $(module-dirs
) modules
1553 $(module-dirs
): crmodverdir
$(objtree
)/Module.symvers
1554 $(Q
)$(MAKE
) $(build
)=$(patsubst _module_
%,%,$@
)
1556 modules
: $(module-dirs
)
1557 @
$(kecho
) ' Building modules, stage 2.';
1558 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1560 PHONY
+= modules_install
1561 modules_install
: _emodinst_ _emodinst_post
1563 install-dir
:= $(if
$(INSTALL_MOD_DIR
),$(INSTALL_MOD_DIR
),extra
)
1566 $(Q
)mkdir
-p
$(MODLIB
)/$(install-dir
)
1567 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1569 PHONY
+= _emodinst_post
1570 _emodinst_post
: _emodinst_
1573 clean-dirs
:= $(addprefix _clean_
,$(KBUILD_EXTMOD
))
1575 PHONY
+= $(clean-dirs
) clean
1577 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1579 clean: rm-dirs
:= $(MODVERDIR
)
1580 clean: rm-files
:= $(KBUILD_EXTMOD
)/Module.symvers
1584 @echo
' Building external modules.'
1585 @echo
' Syntax: make -C path/to/kernel/src M=$$PWD target'
1587 @echo
' modules - default target, build the module(s)'
1588 @echo
' modules_install - install the module'
1589 @echo
' clean - remove generated files in module directory only'
1593 PHONY
+= prepare scripts
1596 endif # KBUILD_EXTMOD
1598 clean: $(clean-dirs
)
1601 @find
$(if
$(KBUILD_EXTMOD
), $(KBUILD_EXTMOD
), .
) $(RCS_FIND_IGNORE
) \
1602 \
( -name
'*.[aios]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
1603 -o
-name
'*.ko.*' -o
-name
'*.dtb' -o
-name
'*.dtb.S' \
1604 -o
-name
'*.dwo' -o
-name
'*.lst' \
1606 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
1607 -o
-name
'*.symtypes' -o
-name
'modules.order' \
1608 -o
-name modules.builtin
-o
-name
'.tmp_*.o.*' \
1609 -o
-name .cache.mk \
1610 -o
-name
'*.c.[012]*.*' \
1612 -o
-name
'*.gcno' \
) -type f
-print | xargs
rm -f
1614 # Generate tags for editors
1615 # ---------------------------------------------------------------------------
1616 quiet_cmd_tags
= GEN
$@
1617 cmd_tags
= $(CONFIG_SHELL
) $(srctree
)/scripts
/tags.sh
$@
1619 tags TAGS cscope gtags
: FORCE
1622 # Scripts to check various things for consistency
1623 # ---------------------------------------------------------------------------
1625 PHONY
+= includecheck versioncheck coccicheck namespacecheck export_report
1628 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1629 -name
'*.[hcS]' -type f
-print |
sort \
1630 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkincludes.pl
1633 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1634 -name
'*.[hcS]' -type f
-print |
sort \
1635 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkversion.pl
1638 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/$@
1641 $(PERL
) $(srctree
)/scripts
/namespace.pl
1644 $(PERL
) $(srctree
)/scripts
/export_report.pl
1646 endif #ifeq ($(config-targets),1)
1647 endif #ifeq ($(mixed-targets),1)
1649 PHONY
+= checkstack kernelrelease kernelversion image_name
1651 # UML needs a little special treatment here. It wants to use the host
1652 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1653 # else wants $(ARCH), including people doing cross-builds, which means
1654 # that $(SUBARCH) doesn't work here.
1656 CHECKSTACK_ARCH
:= $(SUBARCH
)
1658 CHECKSTACK_ARCH
:= $(ARCH
)
1661 $(OBJDUMP
) -d vmlinux
$$(find .
-name
'*.ko') | \
1662 $(PERL
) $(src
)/scripts
/checkstack.pl
$(CHECKSTACK_ARCH
)
1665 @echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1668 @echo
$(KERNELVERSION
)
1671 @echo
$(KBUILD_IMAGE
)
1673 # Clear a bunch of variables before executing the submake
1675 $(Q
)mkdir
-p
$(objtree
)/tools
1676 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(src
)/tools
/
1679 $(Q
)mkdir
-p
$(objtree
)/tools
1680 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(src
)/tools
/ $*
1683 # ---------------------------------------------------------------------------
1684 # Single targets are compatible with:
1685 # - build with mixed source and output
1686 # - build with separate output dir 'make O=...'
1687 # - external modules
1689 # target-dir => where to store outputfile
1690 # build-dir => directory in kernel source tree to use
1692 ifeq ($(KBUILD_EXTMOD
),)
1693 build-dir
= $(patsubst %/,%,$(dir $@
))
1694 target-dir
= $(dir $@
)
1696 zap-slash
=$(filter-out .
,$(patsubst %/,%,$(dir $@
)))
1697 build-dir
= $(KBUILD_EXTMOD
)$(if
$(zap-slash
),/$(zap-slash
))
1698 target-dir
= $(if
$(KBUILD_EXTMOD
),$(dir $<),$(dir $@
))
1701 %.s
: %.c prepare scripts FORCE
1702 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1703 %.i
: %.c prepare scripts FORCE
1704 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1705 %.o
: %.c prepare scripts FORCE
1706 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1707 %.lst
: %.c prepare scripts FORCE
1708 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1709 %.s
: %.S prepare scripts FORCE
1710 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1711 %.o
: %.S prepare scripts FORCE
1712 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1713 %.symtypes
: %.c prepare scripts FORCE
1714 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1715 %.ll
: %.c prepare scripts FORCE
1716 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1719 /: prepare scripts FORCE
1721 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1722 $(build
)=$(build-dir
)
1723 # Make sure the latest headers are built for Documentation
1724 Documentation
/ samples
/: headers_install
1725 %/: prepare scripts FORCE
1727 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1728 $(build
)=$(build-dir
)
1729 %.ko
: prepare scripts FORCE
1731 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1732 $(build
)=$(build-dir
) $(@
:.ko
=.o
)
1733 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1735 # FIXME Should go into a make.lib or something
1736 # ===========================================================================
1738 quiet_cmd_rmdirs
= $(if
$(wildcard $(rm-dirs
)),CLEAN
$(wildcard $(rm-dirs
)))
1739 cmd_rmdirs
= rm -rf
$(rm-dirs
)
1741 quiet_cmd_rmfiles
= $(if
$(wildcard $(rm-files
)),CLEAN
$(wildcard $(rm-files
)))
1742 cmd_rmfiles
= rm -f
$(rm-files
)
1744 # Run depmod only if we have System.map and depmod is executable
1745 quiet_cmd_depmod
= DEPMOD
$(KERNELRELEASE
)
1746 cmd_depmod
= $(CONFIG_SHELL
) $(srctree
)/scripts
/depmod.sh
$(DEPMOD
) \
1747 $(KERNELRELEASE
) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1749 # Create temporary dir for module support files
1750 # clean it up only when building all modules
1751 cmd_crmodverdir
= $(Q
)mkdir
-p
$(MODVERDIR
) \
1752 $(if
$(KBUILD_MODULES
),; rm -f
$(MODVERDIR
)/*)
1754 # read all saved command lines
1756 cmd_files
:= $(wildcard .
*.cmd
$(foreach f
,$(sort $(targets
)),$(dir $(f
)).
$(notdir $(f
)).cmd
))
1758 ifneq ($(cmd_files
),)
1759 $(cmd_files
): ; # Do not try to update included dependency files
1760 include $(cmd_files
)
1763 endif # skip-makefile
1768 # Declare the contents of the .PHONY variable as phony. We keep that
1769 # information in a variable so we can use it in if_changed and friends.