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
= $(C
)
175 ifndef KBUILD_CHECKSRC
179 # Call message checker as part of the C compilation
181 # Use 'make D=1' to enable checking
182 # Use 'make D=2' to create the message catalog
185 ifeq ("$(origin D)", "command line")
186 KBUILD_KMSG_CHECK
= $(D
)
189 ifndef KBUILD_KMSG_CHECK
190 KBUILD_KMSG_CHECK
= 0
193 # Use make M=dir to specify directory of external module to build
194 # Old syntax make ... SUBDIRS=$PWD is still supported
195 # Setting the environment variable KBUILD_EXTMOD take precedence
197 KBUILD_EXTMOD ?
= $(SUBDIRS
)
200 ifeq ("$(origin M)", "command line")
201 KBUILD_EXTMOD
:= $(M
)
204 ifeq ($(KBUILD_SRC
),)
205 # building in the source tree
208 ifeq ($(KBUILD_SRC
)/,$(dir $(CURDIR
)))
209 # building in a subdirectory of the source tree
212 srctree
:= $(KBUILD_SRC
)
216 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
222 VPATH
:= $(srctree
)$(if
$(KBUILD_EXTMOD
),:$(KBUILD_EXTMOD
))
224 export srctree objtree VPATH
226 # To make sure we do not include .config for any of the *config targets
227 # catch them early, and hand them over to scripts/kconfig/Makefile
228 # It is allowed to specify more targets when calling make, including
229 # mixing *config targets and build targets.
230 # For example 'make oldconfig all'.
231 # Detect when mixed targets is specified, and make a second invocation
232 # of make so .config is not included in this case either (for *config).
234 version_h
:= include/generated
/uapi
/linux
/version.h
235 old_version_h
:= include/linux
/version.h
237 no-dot-config-targets
:= clean mrproper
distclean \
238 cscope gtags TAGS
tags help
% %docs
check% coccicheck \
239 $(version_h
) headers_
% archheaders archscripts \
240 kernelversion
%src-pkg
241 no-sync-config-targets
:= $(no-dot-config-targets
) install %install
248 ifneq ($(filter $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
249 ifeq ($(filter-out $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
254 ifneq ($(filter $(no-sync-config-targets
), $(MAKECMDGOALS
)),)
255 ifeq ($(filter-out $(no-sync-config-targets
), $(MAKECMDGOALS
)),)
260 ifneq ($(KBUILD_EXTMOD
),)
264 ifeq ($(KBUILD_EXTMOD
),)
265 ifneq ($(filter config
%config
,$(MAKECMDGOALS
)),)
267 ifneq ($(words $(MAKECMDGOALS
)),1)
272 # install and modules_install need also be processed one by one
273 ifneq ($(filter install,$(MAKECMDGOALS
)),)
274 ifneq ($(filter modules_install
,$(MAKECMDGOALS
)),)
279 ifeq ($(mixed-targets
),1)
280 # ===========================================================================
281 # We're called with mixed targets (*config and build targets).
282 # Handle them one by one.
284 PHONY
+= $(MAKECMDGOALS
) __build_one_by_one
286 $(filter-out __build_one_by_one
, $(MAKECMDGOALS
)): __build_one_by_one
291 for i in
$(MAKECMDGOALS
); do \
292 $(MAKE
) -f
$(srctree
)/Makefile
$$i; \
297 # We need some generic definitions (do not try to remake the file).
298 scripts
/Kbuild.
include: ;
299 include scripts
/Kbuild.
include
301 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
302 KERNELRELEASE
= $(shell cat
include/config
/kernel.release
2> /dev
/null
)
303 KERNELVERSION
= $(VERSION
)$(if
$(PATCHLEVEL
),.
$(PATCHLEVEL
)$(if
$(SUBLEVEL
),.
$(SUBLEVEL
)))$(EXTRAVERSION
)
304 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
306 include scripts
/subarch.
include
308 # Cross compiling and selecting different set of gcc/bin-utils
309 # ---------------------------------------------------------------------------
311 # When performing cross compilation for other architectures ARCH shall be set
312 # to the target architecture. (See arch/* for the possibilities).
313 # ARCH can be set during invocation of make:
315 # Another way is to have ARCH set in the environment.
316 # The default ARCH is the host where make is executed.
318 # CROSS_COMPILE specify the prefix used for all executables used
319 # during compilation. Only gcc and related bin-utils executables
320 # are prefixed with $(CROSS_COMPILE).
321 # CROSS_COMPILE can be set on the command line
322 # make CROSS_COMPILE=ia64-linux-
323 # Alternatively CROSS_COMPILE can be set in the environment.
324 # A third alternative is to store a setting in .config so that plain
325 # "make" in the configured kernel build directory always uses that.
326 # Default value for CROSS_COMPILE is not to prefix executables
327 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
329 CROSS_COMPILE ?
= $(CONFIG_CROSS_COMPILE
:"%"=%)
331 # Architecture as present in compile.h
332 UTS_MACHINE
:= $(ARCH
)
335 # Additional ARCH settings for x86
339 ifeq ($(ARCH
),x86_64
)
343 # Additional ARCH settings for sparc
344 ifeq ($(ARCH
),sparc32
)
347 ifeq ($(ARCH
),sparc64
)
351 # Additional ARCH settings for sh
356 # Additional ARCH settings for tile
357 ifeq ($(ARCH
),tilepro
)
360 ifeq ($(ARCH
),tilegx
)
364 KCONFIG_CONFIG ?
= .config
365 export KCONFIG_CONFIG
367 # SHELL used by kbuild
368 CONFIG_SHELL
:= $(shell if
[ -x
"$$BASH" ]; then echo
$$BASH; \
369 else if
[ -x
/bin
/bash
]; then echo
/bin
/bash
; \
370 else echo sh
; fi
; fi
)
372 HOST_LFS_CFLAGS
:= $(shell getconf LFS_CFLAGS
2>/dev
/null
)
373 HOST_LFS_LDFLAGS
:= $(shell getconf LFS_LDFLAGS
2>/dev
/null
)
374 HOST_LFS_LIBS
:= $(shell getconf LFS_LIBS
2>/dev
/null
)
378 HOSTCFLAGS
:= -Wall
-Wmissing-prototypes
-Wstrict-prototypes
-O2 \
379 -fomit-frame-pointer
-std
=gnu89
$(HOST_LFS_CFLAGS
)
380 HOSTCXXFLAGS
:= -O2
$(HOST_LFS_CFLAGS
)
381 HOSTLDFLAGS
:= $(HOST_LFS_LDFLAGS
)
382 HOST_LOADLIBES
:= $(HOST_LFS_LIBS
)
384 # Make variables (CC, etc...)
385 AS
= $(CROSS_COMPILE
)as
386 LD
= $(CROSS_COMPILE
)ld
387 CC
= $(CROSS_COMPILE
)gcc
389 AR
= $(CROSS_COMPILE
)ar
390 NM
= $(CROSS_COMPILE
)nm
391 STRIP
= $(CROSS_COMPILE
)strip
392 OBJCOPY
= $(CROSS_COMPILE
)objcopy
393 OBJDUMP
= $(CROSS_COMPILE
)objdump
395 GENKSYMS
= scripts
/genksyms
/genksyms
396 INSTALLKERNEL
:= installkernel
397 DEPMOD
= /sbin
/depmod
402 CHECKFLAGS
:= -D__linux__
-Dlinux
-D__STDC__
-Dunix
-D__unix__ \
403 -Wbitwise
-Wno-return-void
$(CF
)
404 KMSG_CHECK
= $(srctree
)/scripts
/kmsg-doc
413 # Prefer linux-backports-modules
414 ifneq ($(KBUILD_SRC
),)
415 ifneq ($(shell if
test -e
$(KBUILD_OUTPUT
)/ubuntu-build
; then echo yes
; fi
),yes
)
416 UBUNTUINCLUDE
:= -I
/usr
/src
/linux-headers-lbm-
$(KERNELRELEASE
)
420 # Use USERINCLUDE when you must reference the UAPI directories only.
422 -I
$(srctree
)/arch
/$(SRCARCH
)/include/uapi \
423 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated
/uapi \
424 -I
$(srctree
)/include/uapi \
425 -I
$(objtree
)/include/generated
/uapi \
426 -include $(srctree
)/include/linux
/kconfig.h
428 # Use LINUXINCLUDE when you must reference the include/ directory.
429 # Needed to be compatible with the O= option
432 -I
$(srctree
)/arch
/$(SRCARCH
)/include \
433 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated \
434 $(if
$(KBUILD_SRC
), -I
$(srctree
)/include) \
435 -I
$(objtree
)/include \
438 # UBUNTU: Include our third party driver stuff too
439 LINUXINCLUDE
+= -Iubuntu
/include $(if
$(KBUILD_SRC
),-I
$(srctree
)/ubuntu
/include)
441 KBUILD_AFLAGS
:= -D__ASSEMBLY__
442 KBUILD_CFLAGS
:= -Wall
-Wundef
-Wstrict-prototypes
-Wno-trigraphs \
443 -fno-strict-aliasing
-fno-common
-fshort-wchar \
444 -Werror-implicit-function-declaration \
445 -Wno-format-security \
447 KBUILD_CPPFLAGS
:= -D__KERNEL__
448 KBUILD_AFLAGS_KERNEL
:=
449 KBUILD_CFLAGS_KERNEL
:=
450 KBUILD_AFLAGS_MODULE
:= -DMODULE
451 KBUILD_CFLAGS_MODULE
:= -DMODULE
452 KBUILD_LDFLAGS_MODULE
:= -T
$(srctree
)/scripts
/module-common.lds
453 GCC_PLUGINS_CFLAGS
:=
456 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
457 export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
458 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
459 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
461 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
462 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
463 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
464 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
465 export KBUILD_KMSG_CHECK KMSG_CHECK
466 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
467 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
468 export KBUILD_ARFLAGS
470 # When compiling out-of-tree modules, put MODVERDIR in the module
471 # tree rather than in the kernel tree. The kernel tree might
473 export MODVERDIR
:= $(if
$(KBUILD_EXTMOD
),$(firstword $(KBUILD_EXTMOD
))/).tmp_versions
475 # Files to ignore in find ... statements
477 export RCS_FIND_IGNORE
:= \
( -name SCCS
-o
-name BitKeeper
-o
-name .svn
-o \
478 -name CVS
-o
-name .
pc -o
-name .hg
-o
-name .git \
) \
480 export RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn \
481 --exclude CVS
--exclude .
pc --exclude .hg
--exclude .git
483 # ===========================================================================
484 # Rules shared between *config targets and build targets
486 # Basic helpers built in scripts/basic/
487 PHONY
+= scripts_basic
489 $(Q
)$(MAKE
) $(build
)=scripts
/basic
490 $(Q
)rm -f .tmp_quiet_recordmcount
492 # To avoid any implicit rule to kick in, define an empty command.
493 scripts
/basic
/%: scripts_basic
;
495 PHONY
+= outputmakefile
496 # outputmakefile generates a Makefile in the output directory, if using a
497 # separate output directory. This allows convenient use of make in the
500 ifneq ($(KBUILD_SRC
),)
501 $(Q
)ln
-fsn
$(srctree
) source
502 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/mkmakefile \
503 $(srctree
) $(objtree
) $(VERSION
) $(PATCHLEVEL
)
506 ifeq ($(cc-name
),clang
)
507 ifneq ($(CROSS_COMPILE
),)
508 CLANG_FLAGS
+= --target
=$(notdir $(CROSS_COMPILE
:%-=%))
509 GCC_TOOLCHAIN_DIR
:= $(dir $(shell which
$(CROSS_COMPILE
)elfedit
))
510 CLANG_FLAGS
+= --prefix=$(GCC_TOOLCHAIN_DIR
)
511 GCC_TOOLCHAIN
:= $(realpath
$(GCC_TOOLCHAIN_DIR
)/..
)
513 ifneq ($(GCC_TOOLCHAIN
),)
514 CLANG_FLAGS
+= --gcc-toolchain
=$(GCC_TOOLCHAIN
)
516 CLANG_FLAGS
+= -no-integrated-as
517 CLANG_FLAGS
+= -Werror
=unknown-warning-option
518 KBUILD_CFLAGS
+= $(CLANG_FLAGS
)
519 KBUILD_AFLAGS
+= $(CLANG_FLAGS
)
523 RETPOLINE_CFLAGS_GCC
:= -mindirect-branch
=thunk-extern
-mindirect-branch-register
524 RETPOLINE_VDSO_CFLAGS_GCC
:= -mindirect-branch
=thunk-inline
-mindirect-branch-register
525 RETPOLINE_CFLAGS_CLANG
:= -mretpoline-external-thunk
526 RETPOLINE_VDSO_CFLAGS_CLANG
:= -mretpoline
527 RETPOLINE_CFLAGS
:= $(call cc-option
,$(RETPOLINE_CFLAGS_GCC
),$(call cc-option
,$(RETPOLINE_CFLAGS_CLANG
)))
528 RETPOLINE_VDSO_CFLAGS
:= $(call cc-option
,$(RETPOLINE_VDSO_CFLAGS_GCC
),$(call cc-option
,$(RETPOLINE_VDSO_CFLAGS_CLANG
)))
529 export RETPOLINE_CFLAGS
530 export RETPOLINE_VDSO_CFLAGS
532 ifeq ($(config-targets
),1)
533 # ===========================================================================
534 # *config targets only - make sure prerequisites are updated, and descend
535 # in scripts/kconfig to make the *config target
537 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
538 # KBUILD_DEFCONFIG may point out an alternative default configuration
539 # used for 'make defconfig'
540 include arch
/$(SRCARCH
)/Makefile
541 export KBUILD_DEFCONFIG KBUILD_KCONFIG
543 config
: scripts_basic outputmakefile FORCE
544 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
546 %config
: scripts_basic outputmakefile FORCE
547 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
550 # ===========================================================================
551 # Build targets only - this includes vmlinux, arch specific targets, clean
552 # targets and others. In general all targets except *config targets.
554 # If building an external module we do not care about the all: rule
555 # but instead _all depend on modules
557 ifeq ($(KBUILD_EXTMOD
),)
563 # Decide whether to build built-in, modular, or both.
564 # Normally, just do built-in.
569 # If we have only "make modules", don't compile built-in objects.
570 # When we're building modules with modversions, we need to consider
571 # the built-in objects during the descend as well, in order to
572 # make sure the checksums are up to date before we record them.
574 ifeq ($(MAKECMDGOALS
),modules
)
575 KBUILD_BUILTIN
:= $(if
$(CONFIG_MODVERSIONS
),1)
578 # If we have "make <whatever> modules", compile modules
579 # in addition to whatever we do anyway.
580 # Just "make" or "make all" shall build modules as well
582 ifneq ($(filter all _all modules
,$(MAKECMDGOALS
)),)
586 ifeq ($(MAKECMDGOALS
),)
590 export KBUILD_MODULES KBUILD_BUILTIN
592 ifeq ($(KBUILD_EXTMOD
),)
593 # Additional helpers built in scripts/
594 # Carefully list dependencies so we do not try to build scripts twice
597 scripts
: scripts_basic
include/config
/auto.conf
include/config
/tristate.conf \
598 asm-generic gcc-plugins
599 $(Q
)$(MAKE
) $(build
)=$(@
)
601 # Objects we will link into vmlinux / subdirs we need to visit
603 drivers-y
:= drivers
/ sound
/ firmware
/ ubuntu
/
608 endif # KBUILD_EXTMOD
610 ifeq ($(dot-config
),1)
612 -include include/config
/auto.conf
614 ifeq ($(may-sync-config
),1)
615 # Read in dependencies to all Kconfig* files, make sure to run
616 # oldconfig if changes are detected.
617 -include include/config
/auto.conf.cmd
619 # To avoid any implicit rule to kick in, define an empty command
622 # If .config is newer than include/config/auto.conf, someone tinkered
623 # with it and forgot to run make oldconfig.
624 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
625 # we execute the config step to be sure to catch updated Kconfig files
627 # This exploits the 'multi-target pattern rule' trick.
628 # The syncconfig should be executed only once to make all the targets.
629 %/auto.conf
%/auto.conf.cmd
%/tristate.conf
: $(KCONFIG_CONFIG
)
630 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile silentoldconfig
632 # External modules and some install targets need include/generated/autoconf.h
633 # and include/config/auto.conf but do not care if they are up-to-date.
634 # Use auto.conf to trigger the test
635 PHONY
+= include/config
/auto.conf
637 include/config
/auto.conf
:
638 $(Q
)test -e
include/generated
/autoconf.h
-a
-e
$@ ||
( \
640 echo
>&2 " ERROR: Kernel configuration is invalid."; \
641 echo
>&2 " include/generated/autoconf.h or $@ are missing.";\
642 echo
>&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
646 endif # may-sync-config
649 # Dummy target needed, because used as prerequisite
650 include/config
/auto.conf
: ;
651 endif # $(dot-config)
653 # For the kernel to actually contain only the needed exported symbols,
654 # we have to build modules as well to determine what those symbols are.
655 # (this can be evaluated only once include/config/auto.conf has been included)
656 ifdef CONFIG_TRIM_UNUSED_KSYMS
660 # The all: target is the default when no target is given on the
662 # This allow a user to issue only 'make' to build a kernel including modules
663 # Defaults to vmlinux, but the arch makefile usually adds further targets
666 KBUILD_CFLAGS
+= $(call cc-option
,-fno-PIE
)
667 KBUILD_AFLAGS
+= $(call cc-option
,-fno-PIE
)
668 CFLAGS_GCOV
:= -fprofile-arcs
-ftest-coverage
-fno-tree-loop-im
$(call cc-disable-warning
,maybe-uninitialized
,)
669 export CFLAGS_GCOV CFLAGS_KCOV
671 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
672 # values of the respective KBUILD_* variables
676 include arch
/$(SRCARCH
)/Makefile
678 KBUILD_CFLAGS
+= $(call cc-option
,-fno-delete-null-pointer-checks
,)
679 KBUILD_CFLAGS
+= $(call cc-disable-warning
,frame-address
,)
680 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-truncation
)
681 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-overflow
)
682 KBUILD_CFLAGS
+= $(call cc-disable-warning
, int-in-bool-context
)
683 KBUILD_CFLAGS
+= $(call cc-disable-warning
, address-of-packed-member
)
684 KBUILD_CFLAGS
+= $(call cc-disable-warning
, attribute-alias
)
686 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
687 KBUILD_CFLAGS
+= -Os
$(call cc-disable-warning
,maybe-uninitialized
,)
689 ifdef CONFIG_PROFILE_ALL_BRANCHES
690 KBUILD_CFLAGS
+= -O2
$(call cc-disable-warning
,maybe-uninitialized
,)
696 KBUILD_CFLAGS
+= $(call cc-ifversion
, -lt
, 0409, \
697 $(call cc-disable-warning
,maybe-uninitialized
,))
699 # Tell gcc to never replace conditional load with a non-conditional one
700 KBUILD_CFLAGS
+= $(call cc-option
,--param
=allow-store-data-races
=0)
702 # check for 'asm goto'
703 ifeq ($(call shell-cached
,$(CONFIG_SHELL
) $(srctree
)/scripts
/gcc-goto.sh
$(CC
) $(KBUILD_CFLAGS
)), y
)
704 KBUILD_CFLAGS
+= -DCC_HAVE_ASM_GOTO
705 KBUILD_AFLAGS
+= -DCC_HAVE_ASM_GOTO
708 include scripts
/Makefile.kcov
709 include scripts
/Makefile.gcc-plugins
711 ifdef CONFIG_READABLE_ASM
712 # Disable optimizations that make assembler listings hard to read.
713 # reorder blocks reorders the control in the function
714 # ipa clone creates specialized cloned functions
715 # partial inlining inlines only parts of functions
716 KBUILD_CFLAGS
+= $(call cc-option
,-fno-reorder-blocks
,) \
717 $(call cc-option
,-fno-ipa-cp-clone
,) \
718 $(call cc-option
,-fno-partial-inlining
)
721 ifneq ($(CONFIG_FRAME_WARN
),0)
722 KBUILD_CFLAGS
+= $(call cc-option
,-Wframe-larger-than
=${CONFIG_FRAME_WARN})
725 # This selects the stack protector compiler flag. Testing it is delayed
726 # until after .config has been reprocessed, in the prepare-compiler-check
728 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
729 stackp-flag
:= -fstack-protector
730 stackp-name
:= REGULAR
732 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
733 stackp-flag
:= -fstack-protector-strong
734 stackp-name
:= STRONG
736 # Force off for distro compilers that enable stack protector by default.
737 stackp-flag
:= $(call cc-option
, -fno-stack-protector
)
740 # Find arch-specific stack protector compiler sanity-checking script.
741 ifdef CONFIG_CC_STACKPROTECTOR
742 stackp-path
:= $(srctree
)/scripts
/gcc-
$(SRCARCH
)_
$(BITS
)-has-stack-protector.sh
743 stackp-check
:= $(wildcard $(stackp-path
))
745 KBUILD_CFLAGS
+= $(stackp-flag
)
747 ifeq ($(cc-name
),clang
)
748 KBUILD_CPPFLAGS
+= $(call cc-option
,-Qunused-arguments
,)
749 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-invalid-specifier
)
750 KBUILD_CFLAGS
+= $(call cc-disable-warning
, gnu
)
751 # Quiet clang warning: comparison of unsigned expression < 0 is always false
752 KBUILD_CFLAGS
+= $(call cc-disable-warning
, tautological-compare
)
753 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
754 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
755 # See modpost pattern 2
756 KBUILD_CFLAGS
+= $(call cc-option
, -mno-global-merge
,)
757 KBUILD_CFLAGS
+= $(call cc-option
, -fcatch-undefined-behavior
)
760 # These warnings generated too much noise in a regular build.
761 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
762 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-but-set-variable
)
765 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-const-variable
)
766 ifdef CONFIG_FRAME_POINTER
767 KBUILD_CFLAGS
+= -fno-omit-frame-pointer
-fno-optimize-sibling-calls
769 # Some targets (ARM with Thumb2, for example), can't be built with frame
770 # pointers. For those, we don't have FUNCTION_TRACER automatically
771 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
772 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
773 # -fomit-frame-pointer with FUNCTION_TRACER.
774 ifndef CONFIG_FUNCTION_TRACER
775 KBUILD_CFLAGS
+= -fomit-frame-pointer
779 KBUILD_CFLAGS
+= $(call cc-option
, -fno-var-tracking-assignments
)
781 ifdef CONFIG_DEBUG_INFO
782 ifdef CONFIG_DEBUG_INFO_SPLIT
783 KBUILD_CFLAGS
+= $(call cc-option
, -gsplit-dwarf
, -g
)
787 KBUILD_AFLAGS
+= -Wa
,-gdwarf-2
789 ifdef CONFIG_DEBUG_INFO_DWARF4
790 KBUILD_CFLAGS
+= $(call cc-option
, -gdwarf-4
,)
793 ifdef CONFIG_DEBUG_INFO_REDUCED
794 KBUILD_CFLAGS
+= $(call cc-option
, -femit-struct-debug-baseonly
) \
795 $(call cc-option
,-fno-var-tracking
)
798 ifdef CONFIG_FUNCTION_TRACER
799 ifndef CC_FLAGS_FTRACE
800 CC_FLAGS_FTRACE
:= -pg
802 export CC_FLAGS_FTRACE
803 ifdef CONFIG_HAVE_FENTRY
804 CC_USING_FENTRY
:= $(call cc-option
, -mfentry
-DCC_USING_FENTRY
)
806 KBUILD_CFLAGS
+= $(CC_FLAGS_FTRACE
) $(CC_USING_FENTRY
)
807 KBUILD_AFLAGS
+= $(CC_USING_FENTRY
)
808 ifdef CONFIG_DYNAMIC_FTRACE
809 ifdef CONFIG_HAVE_C_RECORDMCOUNT
810 BUILD_C_RECORDMCOUNT
:= y
811 export BUILD_C_RECORDMCOUNT
816 # We trigger additional mismatches with less inlining
817 ifdef CONFIG_DEBUG_SECTION_MISMATCH
818 KBUILD_CFLAGS
+= $(call cc-option
, -fno-inline-functions-called-once
)
821 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
822 KBUILD_CFLAGS
+= $(call cc-option
,-ffunction-sections
,)
823 KBUILD_CFLAGS
+= $(call cc-option
,-fdata-sections
,)
826 # arch Makefile may override CC so keep this after arch Makefile is included
827 NOSTDINC_FLAGS
+= -nostdinc
-isystem
$(call shell-cached
,$(CC
) -print-file-name
=include)
828 CHECKFLAGS
+= $(NOSTDINC_FLAGS
)
830 # warn about C99 declaration after statement
831 KBUILD_CFLAGS
+= $(call cc-option
,-Wdeclaration-after-statement
,)
833 # disable pointer signed / unsigned warnings in gcc 4.0
834 KBUILD_CFLAGS
+= $(call cc-disable-warning
, pointer-sign
)
836 # disable stringop warnings in gcc 8+
837 KBUILD_CFLAGS
+= $(call cc-disable-warning
, stringop-truncation
)
839 # disable invalid "can't wrap" optimizations for signed / pointers
840 KBUILD_CFLAGS
+= $(call cc-option
,-fno-strict-overflow
)
842 # clang sets -fmerge-all-constants by default as optimization, but this
843 # is non-conforming behavior for C and in fact breaks the kernel, so we
844 # need to disable it here generally.
845 KBUILD_CFLAGS
+= $(call cc-option
,-fno-merge-all-constants
)
847 # for gcc -fno-merge-all-constants disables everything, but it is fine
848 # to have actual conforming behavior enabled.
849 KBUILD_CFLAGS
+= $(call cc-option
,-fmerge-constants
)
851 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
852 KBUILD_CFLAGS
+= $(call cc-option
,-fno-stack-check
,)
854 # conserve stack if available
855 KBUILD_CFLAGS
+= $(call cc-option
,-fconserve-stack
)
857 # disallow errors like 'EXPORT_GPL(foo);' with missing header
858 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=implicit-int
)
860 # require functions to have arguments in prototypes, not empty 'int foo()'
861 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=strict-prototypes
)
863 # Prohibit date/time macros, which would make the build non-deterministic
864 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=date-time
)
866 # enforce correct pointer usage
867 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=incompatible-pointer-types
)
869 # Require designated initializers for all marked structures
870 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=designated-init
)
872 # ensure -fcf-protection is disabled when using retpoline as it is
873 # incompatible with -mindirect-branch=thunk-extern
874 ifdef CONFIG_RETPOLINE
875 KBUILD_CFLAGS
+= $(call cc-option
,-fcf-protection
=none
)
878 # use the deterministic mode of AR if available
879 KBUILD_ARFLAGS
:= $(call ar-option
,D
)
881 include scripts
/Makefile.kasan
882 include scripts
/Makefile.extrawarn
883 include scripts
/Makefile.ubsan
885 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
887 KBUILD_CPPFLAGS
+= $(ARCH_CPPFLAGS
) $(KCPPFLAGS
)
888 KBUILD_AFLAGS
+= $(ARCH_AFLAGS
) $(KAFLAGS
)
889 KBUILD_CFLAGS
+= $(ARCH_CFLAGS
) $(KCFLAGS
)
891 # Use --build-id when available.
892 LDFLAGS_BUILD_ID
:= $(patsubst -Wl
$(comma
)%,%,\
893 $(call cc-ldoption
, -Wl
$(comma
)--build-id
,))
894 KBUILD_LDFLAGS_MODULE
+= $(LDFLAGS_BUILD_ID
)
895 LDFLAGS_vmlinux
+= $(LDFLAGS_BUILD_ID
)
897 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
898 LDFLAGS_vmlinux
+= $(call ld-option
, --gc-sections
,)
901 ifeq ($(CONFIG_STRIP_ASM_SYMS
),y
)
902 LDFLAGS_vmlinux
+= $(call ld-option
, -X
,)
905 # Default kernel image to build when no specific target is given.
906 # KBUILD_IMAGE may be overruled on the command line or
907 # set in the environment
908 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
910 export KBUILD_IMAGE ?
= vmlinux
913 # INSTALL_PATH specifies where to place the updated kernel and system map
914 # images. Default is /boot, but you can set it to other values
915 export INSTALL_PATH ?
= /boot
918 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
919 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
920 # an argument if needed. Otherwise it defaults to the kernel install path
922 export INSTALL_DTBS_PATH ?
= $(INSTALL_PATH
)/dtbs
/$(KERNELRELEASE
)
925 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
926 # relocations required by build roots. This is not defined in the
927 # makefile but the argument can be passed to make if needed.
930 MODLIB
= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
934 # INSTALL_MOD_STRIP, if defined, will cause modules to be
935 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
936 # the default option --strip-debug will be used. Otherwise,
937 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
939 ifdef INSTALL_MOD_STRIP
940 ifeq ($(INSTALL_MOD_STRIP
),1)
941 mod_strip_cmd
= $(STRIP
) --strip-debug
943 mod_strip_cmd
= $(STRIP
) $(INSTALL_MOD_STRIP
)
944 endif # INSTALL_MOD_STRIP=1
947 endif # INSTALL_MOD_STRIP
950 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
951 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
952 # or CONFIG_MODULE_COMPRESS_XZ.
954 mod_compress_cmd
= true
955 ifdef CONFIG_MODULE_COMPRESS
956 ifdef CONFIG_MODULE_COMPRESS_GZIP
957 mod_compress_cmd
= gzip
-n
-f
958 endif # CONFIG_MODULE_COMPRESS_GZIP
959 ifdef CONFIG_MODULE_COMPRESS_XZ
960 mod_compress_cmd
= xz
-f
961 endif # CONFIG_MODULE_COMPRESS_XZ
962 endif # CONFIG_MODULE_COMPRESS
963 export mod_compress_cmd
965 # Select initial ramdisk compression format, default is gzip(1).
966 # This shall be used by the dracut(8) tool while creating an initramfs image.
968 INITRD_COMPRESS-y
:= gzip
969 INITRD_COMPRESS-
$(CONFIG_RD_BZIP2
) := bzip2
970 INITRD_COMPRESS-
$(CONFIG_RD_LZMA
) := lzma
971 INITRD_COMPRESS-
$(CONFIG_RD_XZ
) := xz
972 INITRD_COMPRESS-
$(CONFIG_RD_LZO
) := lzo
973 INITRD_COMPRESS-
$(CONFIG_RD_LZ4
) := lz4
974 # do not export INITRD_COMPRESS, since we didn't actually
975 # choose a sane default compression above.
976 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
978 ifdef CONFIG_MODULE_SIG_ALL
979 $(eval
$(call config_filename
,MODULE_SIG_KEY
))
981 mod_sign_cmd
= scripts
/sign-file
$(CONFIG_MODULE_SIG_HASH
) $(MODULE_SIG_KEY_SRCPREFIX
)$(CONFIG_MODULE_SIG_KEY
) certs
/signing_key.x509
987 HOST_LIBELF_LIBS
= $(shell pkg-config libelf
--libs
2>/dev
/null || echo
-lelf
)
989 ifdef CONFIG_STACK_VALIDATION
990 has_libelf
:= $(call try-run
,\
991 echo
"int main() {}" |
$(HOSTCC
) -xc
-o
/dev
/null
$(HOST_LIBELF_LIBS
) -,1,0)
992 ifeq ($(has_libelf
),1)
993 objtool_target
:= tools
/objtool FORCE
995 SKIP_STACK_VALIDATION
:= 1
996 export SKIP_STACK_VALIDATION
1001 ifeq ($(KBUILD_EXTMOD
),)
1002 core-y
+= kernel
/ certs
/ mm
/ fs
/ ipc
/ security
/ crypto
/ block
/
1004 vmlinux-dirs
:= $(patsubst %/,%,$(filter %/, $(init-y
) $(init-m
) \
1005 $(core-y
) $(core-m
) $(drivers-y
) $(drivers-m
) \
1006 $(net-y
) $(net-m
) $(libs-y
) $(libs-m
) $(virt-y
)))
1008 vmlinux-alldirs
:= $(sort $(vmlinux-dirs
) $(patsubst %/,%,$(filter %/, \
1009 $(init-
) $(core-
) $(drivers-
) $(net-
) $(libs-
) $(virt-
))))
1011 init-y
:= $(patsubst %/, %/built-in.o
, $(init-y
))
1012 core-y
:= $(patsubst %/, %/built-in.o
, $(core-y
))
1013 drivers-y
:= $(patsubst %/, %/built-in.o
, $(drivers-y
))
1014 net-y
:= $(patsubst %/, %/built-in.o
, $(net-y
))
1015 libs-y1
:= $(patsubst %/, %/lib.a
, $(libs-y
))
1016 libs-y2
:= $(filter-out %.a
, $(patsubst %/, %/built-in.o
, $(libs-y
)))
1017 virt-y
:= $(patsubst %/, %/built-in.o
, $(virt-y
))
1019 # Externally visible symbols (used by link-vmlinux.sh)
1020 export KBUILD_VMLINUX_INIT
:= $(head-y
) $(init-y
)
1021 export KBUILD_VMLINUX_MAIN
:= $(core-y
) $(libs-y2
) $(drivers-y
) $(net-y
) $(virt-y
)
1022 export KBUILD_VMLINUX_LIBS
:= $(libs-y1
)
1023 export KBUILD_LDS
:= arch
/$(SRCARCH
)/kernel
/vmlinux.lds
1024 export LDFLAGS_vmlinux
1025 # used by scripts/package/Makefile
1026 export KBUILD_ALLDIRS
:= $(sort $(filter-out arch
/%,$(vmlinux-alldirs
)) arch Documentation
include samples scripts tools
)
1028 vmlinux-deps
:= $(KBUILD_LDS
) $(KBUILD_VMLINUX_INIT
) $(KBUILD_VMLINUX_MAIN
) $(KBUILD_VMLINUX_LIBS
)
1030 # Include targets which we want to execute sequentially if the rest of the
1031 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
1032 # evaluated more than once.
1033 PHONY
+= vmlinux_prereq
1034 vmlinux_prereq
: $(vmlinux-deps
) FORCE
1035 ifdef CONFIG_HEADERS_CHECK
1036 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile headers_check
1038 ifdef CONFIG_GDB_SCRIPTS
1039 $(Q
)ln
-fsn
$(abspath
$(srctree
)/scripts
/gdb
/vmlinux-gdb.py
)
1041 ifdef CONFIG_TRIM_UNUSED_KSYMS
1042 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/adjust_autoksyms.sh \
1043 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1046 # standalone target for easier testing
1047 include/generated
/autoksyms.h
: FORCE
1048 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/adjust_autoksyms.sh true
1050 ARCH_POSTLINK
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/Makefile.postlink
)
1052 # Final link of vmlinux with optional arch pass after final link
1053 cmd_link-vmlinux
= \
1054 $(CONFIG_SHELL
) $< $(LD
) $(LDFLAGS
) $(LDFLAGS_vmlinux
) ; \
1055 $(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) $@
, true
)
1057 vmlinux
: scripts
/link-vmlinux.sh vmlinux_prereq
$(vmlinux-deps
) FORCE
1058 +$(call if_changed
,link-vmlinux
)
1060 # Build samples along the rest of the kernel
1061 ifdef CONFIG_SAMPLES
1062 vmlinux-dirs
+= samples
1065 # The actual objects are generated when descending,
1066 # make sure no implicit rule kicks in
1067 $(sort $(vmlinux-deps
)): $(vmlinux-dirs
) ;
1069 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1070 # Preset locale variables to speed up the build process. Limit locale
1071 # tweaks to this spot to avoid wrong language settings when running
1072 # make menuconfig etc.
1073 # Error messages still appears in the original language
1075 PHONY
+= $(vmlinux-dirs
)
1076 $(vmlinux-dirs
): prepare scripts
1077 $(Q
)$(MAKE
) $(build
)=$@ need-builtin
=1
1079 define filechk_kernel.release
1080 echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1083 # Store (new) KERNELRELEASE string in include/config/kernel.release
1084 include/config
/kernel.release
: include/config
/auto.conf FORCE
1085 $(call filechk
,kernel.release
)
1088 # Things we need to do before we recursively start building the kernel
1089 # or the modules are listed in "prepare".
1090 # A multi level approach is used. prepareN is processed before prepareN-1.
1091 # archprepare is used in arch Makefiles and when processed asm symlink,
1092 # version.h and scripts_basic is processed / created.
1094 # Listed in dependency order
1095 PHONY
+= prepare archprepare prepare0 prepare1 prepare2 prepare3
1097 # prepare3 is used to check if we are building in a separate output directory,
1099 # 1) Check that make has not been executed in the kernel src $(srctree)
1100 prepare3
: include/config
/kernel.release
1101 ifneq ($(KBUILD_SRC
),)
1102 @
$(kecho
) ' Using $(srctree) as source for kernel'
1103 $(Q
)if
[ -f
$(srctree
)/.config
-o
-d
$(srctree
)/include/config
]; then \
1104 echo
>&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1105 echo
>&2 " in the '$(srctree)' directory.";\
1110 # prepare2 creates a makefile if using a separate output directory.
1111 # From this point forward, .config has been reprocessed, so any rules
1112 # that need to depend on updated CONFIG_* values can be checked here.
1113 prepare2
: prepare3 prepare-compiler-check outputmakefile asm-generic
1115 prepare1
: prepare2
$(version_h
) include/generated
/utsrelease.h \
1116 include/config
/auto.conf
1119 archprepare
: archheaders archscripts prepare1 scripts_basic
1121 prepare0
: archprepare gcc-plugins
1122 $(Q
)$(MAKE
) $(build
)=.
1124 # All the preparing..
1125 prepare
: prepare0 prepare-objtool
1127 # Support for using generic headers in asm-generic
1128 PHONY
+= asm-generic uapi-asm-generic
1129 asm-generic
: uapi-asm-generic
1130 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.asm-generic \
1131 src
=asm obj
=arch
/$(SRCARCH
)/include/generated
/asm
1133 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.asm-generic \
1134 src
=uapi
/asm obj
=arch
/$(SRCARCH
)/include/generated
/uapi
/asm
1136 PHONY
+= prepare-objtool
1137 prepare-objtool
: $(objtool_target
)
1138 ifeq ($(SKIP_STACK_VALIDATION
),1)
1139 ifdef CONFIG_UNWINDER_ORC
1140 @echo
"error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1143 @echo
"warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1147 # Check for CONFIG flags that require compiler support. Abort the build
1148 # after .config has been processed, but before the kernel build starts.
1150 # For security-sensitive CONFIG options, we don't want to fallback and/or
1151 # silently change which compiler flags will be used, since that leads to
1152 # producing kernels with different security feature characteristics
1153 # depending on the compiler used. (For example, "But I selected
1154 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1155 PHONY
+= prepare-compiler-check
1156 prepare-compiler-check
: FORCE
1157 # Make sure compiler supports requested stack protector flag.
1159 ifeq ($(call cc-option
, $(stackp-flag
)),)
1160 @echo Cannot use CONFIG_CC_STACKPROTECTOR_
$(stackp-name
): \
1161 $(stackp-flag
) not supported by compiler
>&2 && exit
1
1164 # Make sure compiler does not have buggy stack-protector support.
1166 ifneq ($(shell $(CONFIG_SHELL
) $(stackp-check
) $(CC
) $(KBUILD_CPPFLAGS
) $(biarch
)),y
)
1167 @echo Cannot use CONFIG_CC_STACKPROTECTOR_
$(stackp-name
): \
1168 $(stackp-flag
) available but compiler is broken
>&2 && exit
1
1173 # Generate some files
1174 # ---------------------------------------------------------------------------
1176 # KERNELRELEASE can change from a few different places, meaning version.h
1177 # needs to be updated, so this check is forced on all builds
1180 define filechk_utsrelease.h
1181 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
1182 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1185 (echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1188 define filechk_version.h
1189 (echo \
#define LINUX_VERSION_CODE $(shell \
1190 expr
$(VERSION
) \
* 65536 + 0$(PATCHLEVEL
) \
* 256 + 0$(SUBLEVEL
)); \
1191 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1194 $(version_h
): $(srctree
)/Makefile FORCE
1195 $(call filechk
,version.h
)
1196 $(Q
)rm -f
$(old_version_h
)
1198 include/generated
/utsrelease.h
: include/config
/kernel.release FORCE
1199 $(call filechk
,utsrelease.h
)
1203 $(Q
)find
$(srctree
)/include/ -name
'*.h' | xargs
--max-args
1 \
1204 $(srctree
)/scripts
/headerdep.pl
-I
$(srctree
)/include
1206 # ---------------------------------------------------------------------------
1209 #Default location for installed headers
1210 export INSTALL_HDR_PATH
= $(objtree
)/usr
1212 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1213 hdr-dst
= $(if
$(KBUILD_HEADERS
), dst
=include/arch-
$(SRCARCH
), dst
=include)
1215 PHONY
+= archheaders
1218 PHONY
+= archscripts
1222 __headers
: $(version_h
) scripts_basic uapi-asm-generic archheaders archscripts
1223 $(Q
)$(MAKE
) $(build
)=scripts build_unifdef
1225 PHONY
+= headers_install_all
1226 headers_install_all
:
1227 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
install
1229 PHONY
+= headers_install
1230 headers_install
: __headers
1231 $(if
$(wildcard $(srctree
)/arch
/$(SRCARCH
)/include/uapi
/asm
/Kbuild
),, \
1232 $(error Headers not exportable for the
$(SRCARCH
) architecture
))
1233 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi dst
=include
1234 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(SRCARCH
)/include/uapi
$(hdr-dst
)
1235 $(Q
)$(MAKE
) $(hdr-inst
)=ubuntu
/include dst
=include oldheaders
=
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
1245 $(Q
)$(MAKE
) $(hdr-inst
)=ubuntu
/include dst
=include oldheaders
= HDRCHECK
=1
1247 # ---------------------------------------------------------------------------
1252 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests run_tests
1254 PHONY
+= kselftest-clean
1256 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests
clean
1258 PHONY
+= kselftest-merge
1260 $(if
$(wildcard $(objtree
)/.config
),, $(error No .config exists
, config your kernel first
!))
1261 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/kconfig
/merge_config.sh \
1262 -m
$(objtree
)/.config \
1263 $(srctree
)/tools
/testing
/selftests
/*/config
1264 +$(Q
)$(MAKE
) -f
$(srctree
)/Makefile olddefconfig
1266 # ---------------------------------------------------------------------------
1269 ifdef CONFIG_MODULES
1271 # By default, build modules as well
1277 # A module can be listed more than once in obj-m resulting in
1278 # duplicate lines in modules.order files. Those are removed
1279 # using awk while concatenating to the final file.
1282 modules
: $(vmlinux-dirs
) $(if
$(KBUILD_BUILTIN
),vmlinux
) modules.builtin
1283 $(Q
)$(AWK
) '!x[$$0]++' $(vmlinux-dirs
:%=$(objtree
)/%/modules.order
) > $(objtree
)/modules.order
1284 @
$(kecho
) ' Building modules, stage 2.';
1285 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1287 modules.builtin
: $(vmlinux-dirs
:%=%/modules.builtin
)
1288 $(Q
)$(AWK
) '!x[$$0]++' $^
> $(objtree
)/modules.builtin
1290 %/modules.builtin
: include/config
/auto.conf
1291 $(Q
)$(MAKE
) $(modbuiltin
)=$*
1294 # Target to prepare building external modules
1295 PHONY
+= modules_prepare
1296 modules_prepare
: prepare scripts
1298 # Target to install modules
1299 PHONY
+= modules_install
1300 modules_install
: _modinst_ _modinst_post
1304 @
rm -rf
$(MODLIB
)/kernel
1305 @
rm -f
$(MODLIB
)/source
1306 @mkdir
-p
$(MODLIB
)/kernel
1307 @ln
-s
$(abspath
$(srctree
)) $(MODLIB
)/source
1308 @if
[ ! $(objtree
) -ef
$(MODLIB
)/build
]; then \
1309 rm -f
$(MODLIB
)/build
; \
1310 ln
-s
$(CURDIR
) $(MODLIB
)/build
; \
1312 @cp
-f
$(objtree
)/modules.order
$(MODLIB
)/
1313 @cp
-f
$(objtree
)/modules.builtin
$(MODLIB
)/
1314 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1316 # This depmod is only for convenience to give the initial
1317 # boot a modules.dep even before / is mounted read-write. However the
1318 # boot script depmod is the master version.
1319 PHONY
+= _modinst_post
1320 _modinst_post
: _modinst_
1323 ifeq ($(CONFIG_MODULE_SIG
), y
)
1324 PHONY
+= modules_sign
1326 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modsign
1329 else # CONFIG_MODULES
1331 # Modules not configured
1332 # ---------------------------------------------------------------------------
1334 PHONY
+= modules modules_install
1335 modules modules_install
:
1337 @echo
>&2 "The present kernel configuration has modules disabled."
1338 @echo
>&2 "Type 'make config' and enable loadable module support."
1339 @echo
>&2 "Then build a kernel with module support enabled."
1343 endif # CONFIG_MODULES
1346 # Cleaning is done on three levels.
1347 # make clean Delete most generated files
1348 # Leave enough to build external modules
1349 # make mrproper Delete the current configuration, and all generated files
1350 # make distclean Remove editor backup files, patch leftover files and the like
1352 # Directories & files removed with 'make clean'
1353 CLEAN_DIRS
+= $(MODVERDIR
)
1355 # Directories & files removed with 'make mrproper'
1356 MRPROPER_DIRS
+= include/config usr
/include include/generated \
1357 arch
/*/include/generated .tmp_objdiff
1358 MRPROPER_FILES
+= .config .config.old .version \
1359 Module.symvers
tags TAGS cscope
* GPATH GTAGS GRTAGS GSYMS \
1360 signing_key.pem signing_key.priv signing_key.x509 \
1361 x509.genkey extra_certificates signing_key.x509.keyid \
1362 signing_key.x509.signer vmlinux-gdb.py
1364 # clean - Delete most, but leave enough to build external modules
1366 clean: rm-dirs
:= $(CLEAN_DIRS
)
1367 clean: rm-files
:= $(CLEAN_FILES
)
1368 clean-dirs
:= $(addprefix _clean_
, .
$(vmlinux-alldirs
) Documentation samples
)
1370 PHONY
+= $(clean-dirs
) clean archclean vmlinuxclean
1372 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1375 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/link-vmlinux.sh
clean
1376 $(Q
)$(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) clean)
1378 clean: archclean vmlinuxclean
1380 # mrproper - Delete all generated files, including .config
1382 mrproper
: rm-dirs
:= $(wildcard $(MRPROPER_DIRS
))
1383 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
1384 mrproper-dirs
:= $(addprefix _mrproper_
,scripts
)
1386 PHONY
+= $(mrproper-dirs
) mrproper archmrproper
1388 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
1390 mrproper
: clean archmrproper
$(mrproper-dirs
)
1399 @find
$(srctree
) $(RCS_FIND_IGNORE
) \
1400 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
1401 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'*%' \
1402 -o
-name
'core' \
) \
1403 -type f
-print | xargs
rm -f
1406 # Packaging of the kernel to various formats
1407 # ---------------------------------------------------------------------------
1408 # rpm target kept for backward compatibility
1409 package-dir
:= scripts
/package
1412 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1413 %pkg
: include/config
/kernel.release FORCE
1414 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1416 @echo
" WARNING: \"rpm\" target will be removed after Linux 4.18"
1417 @echo
" Please use \"rpm-pkg\" instead."
1420 # Brief documentation of the typical targets used
1421 # ---------------------------------------------------------------------------
1423 boards
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*_defconfig
)
1424 boards
:= $(sort $(notdir $(boards
)))
1425 board-dirs
:= $(dir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*/*_defconfig
))
1426 board-dirs
:= $(sort $(notdir $(board-dirs
:/=)))
1430 @echo
'Cleaning targets:'
1431 @echo
' clean - Remove most generated files but keep the config and'
1432 @echo
' enough build support to build external modules'
1433 @echo
' mrproper - Remove all generated files + config + various backup files'
1434 @echo
' distclean - mrproper + remove editor backup and patch files'
1436 @echo
'Configuration targets:'
1437 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
1439 @echo
'Other generic targets:'
1440 @echo
' all - Build all targets marked with [*]'
1441 @echo
'* vmlinux - Build the bare kernel'
1442 @echo
'* modules - Build all modules'
1443 @echo
' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1444 @echo
' dir/ - Build all files in dir and below'
1445 @echo
' dir/file.[ois] - Build specified target only'
1446 @echo
' dir/file.ll - Build the LLVM assembly file'
1447 @echo
' (requires compiler support for LLVM assembly generation)'
1448 @echo
' dir/file.lst - Build specified mixed source/assembly target only'
1449 @echo
' (requires a recent binutils and recent build (System.map))'
1450 @echo
' dir/file.ko - Build module including final link'
1451 @echo
' modules_prepare - Set up for building external modules'
1452 @echo
' tags/TAGS - Generate tags file for editors'
1453 @echo
' cscope - Generate cscope index'
1454 @echo
' gtags - Generate GNU GLOBAL index'
1455 @echo
' kernelrelease - Output the release version string (use with make -s)'
1456 @echo
' kernelversion - Output the version stored in Makefile (use with make -s)'
1457 @echo
' image_name - Output the image name (use with make -s)'
1458 @echo
' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1459 echo
' (default: $(INSTALL_HDR_PATH))'; \
1461 @echo
'Static analysers:'
1462 @echo
' checkstack - Generate a list of stack hogs'
1463 @echo
' namespacecheck - Name space analysis on compiled kernel'
1464 @echo
' versioncheck - Sanity check on version.h usage'
1465 @echo
' includecheck - Check for duplicate included header files'
1466 @echo
' export_report - List the usages of all exported symbols'
1467 @echo
' headers_check - Sanity check on exported headers'
1468 @echo
' headerdep - Detect inclusion cycles in headers'
1469 @echo
' coccicheck - Check with Coccinelle'
1471 @echo
'Kernel selftest:'
1472 @echo
' kselftest - Build and run kernel selftest (run as root)'
1473 @echo
' Build, install, and boot kernel before'
1474 @echo
' running kselftest on it'
1475 @echo
' kselftest-clean - Remove all generated kselftest files'
1476 @echo
' kselftest-merge - Merge all the config dependencies of kselftest to existing'
1479 @echo
'Userspace tools targets:'
1480 @echo
' use "make tools/help"'
1481 @echo
' or "cd tools; make help"'
1483 @echo
'Kernel packaging:'
1484 @
$(MAKE
) $(build
)=$(package-dir
) help
1486 @echo
'Documentation targets:'
1487 @
$(MAKE
) -f
$(srctree
)/Documentation
/Makefile dochelp
1489 @echo
'Architecture specific targets ($(SRCARCH)):'
1490 @
$(if
$(archhelp
),$(archhelp
),\
1491 echo
' No architecture specific help defined for $(SRCARCH)')
1494 $(foreach b
, $(boards
), \
1495 printf
" %-24s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
1497 @
$(if
$(board-dirs
), \
1498 $(foreach b
, $(board-dirs
), \
1499 printf
" %-16s - Show %s-specific targets\\n" help-
$(b
) $(b
);) \
1500 printf
" %-16s - Show all of the above\\n" help-boards
; \
1503 @echo
' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1504 @echo
' make V=2 [targets] 2 => give reason for rebuild of target'
1505 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
1506 @echo
' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1507 @echo
' make C=2 [targets] Force check of all c source with $$CHECK'
1508 @echo
' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1509 @echo
' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1510 @echo
' 1: warnings which may be relevant and do not occur too often'
1511 @echo
' 2: warnings which occur quite often but may still be relevant'
1512 @echo
' 3: more obscure warnings, can most likely be ignored'
1513 @echo
' Multiple levels can be combined with W=12 or W=123'
1515 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
1516 @echo
'For further info see the ./README file'
1519 help-board-dirs
:= $(addprefix help-
,$(board-dirs
))
1521 help-boards
: $(help-board-dirs
)
1523 boards-per-dir
= $(sort $(notdir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/$*/*_defconfig
)))
1525 $(help-board-dirs
): help-
%:
1526 @echo
'Architecture specific targets ($(SRCARCH) $*):'
1527 @
$(if
$(boards-per-dir
), \
1528 $(foreach b
, $(boards-per-dir
), \
1529 printf
" %-24s - Build for %s\\n" $*/$(b
) $(subst _defconfig
,,$(b
));) \
1533 # Documentation targets
1534 # ---------------------------------------------------------------------------
1535 DOC_TARGETS
:= xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1536 linkcheckdocs dochelp refcheckdocs
1537 PHONY
+= $(DOC_TARGETS
)
1538 $(DOC_TARGETS
): scripts_basic FORCE
1539 $(Q
)$(MAKE
) $(build
)=Documentation
$@
1541 else # KBUILD_EXTMOD
1544 # External module support.
1545 # When building external modules the kernel used as basis is considered
1546 # read-only, and no consistency checks are made and the make
1547 # system is not used on the basis kernel. If updates are required
1548 # in the basis kernel ordinary make commands (without M=...) must
1551 # The following are the only valid targets when building external
1553 # make M=dir clean Delete all automatically generated files
1554 # make M=dir modules Make all modules in specified dir
1555 # make M=dir Same as 'make M=dir modules'
1556 # make M=dir modules_install
1557 # Install the modules built in the module directory
1558 # Assumes install directory is already created
1560 # We are always building modules
1562 PHONY
+= crmodverdir
1566 PHONY
+= $(objtree
)/Module.symvers
1567 $(objtree
)/Module.symvers
:
1568 @
test -e
$(objtree
)/Module.symvers ||
( \
1570 echo
" WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1571 echo
" is missing; modules will have no dependencies and modversions."; \
1574 module-dirs
:= $(addprefix _module_
,$(KBUILD_EXTMOD
))
1575 PHONY
+= $(module-dirs
) modules
1576 $(module-dirs
): crmodverdir
$(objtree
)/Module.symvers
1577 $(Q
)$(MAKE
) $(build
)=$(patsubst _module_
%,%,$@
)
1579 modules
: $(module-dirs
)
1580 @
$(kecho
) ' Building modules, stage 2.';
1581 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1583 PHONY
+= modules_install
1584 modules_install
: _emodinst_ _emodinst_post
1586 install-dir
:= $(if
$(INSTALL_MOD_DIR
),$(INSTALL_MOD_DIR
),extra
)
1589 $(Q
)mkdir
-p
$(MODLIB
)/$(install-dir
)
1590 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1592 PHONY
+= _emodinst_post
1593 _emodinst_post
: _emodinst_
1596 clean-dirs
:= $(addprefix _clean_
,$(KBUILD_EXTMOD
))
1598 PHONY
+= $(clean-dirs
) clean
1600 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1602 clean: rm-dirs
:= $(MODVERDIR
)
1603 clean: rm-files
:= $(KBUILD_EXTMOD
)/Module.symvers
1607 @echo
' Building external modules.'
1608 @echo
' Syntax: make -C path/to/kernel/src M=$$PWD target'
1610 @echo
' modules - default target, build the module(s)'
1611 @echo
' modules_install - install the module'
1612 @echo
' clean - remove generated files in module directory only'
1616 PHONY
+= prepare scripts
1619 endif # KBUILD_EXTMOD
1621 clean: $(clean-dirs
)
1624 @find
$(if
$(KBUILD_EXTMOD
), $(KBUILD_EXTMOD
), .
) $(RCS_FIND_IGNORE
) \
1625 \
( -name
'*.[aios]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
1626 -o
-name
'*.ko.*' -o
-name
'*.dtb' -o
-name
'*.dtb.S' \
1627 -o
-name
'*.dwo' -o
-name
'*.lst' \
1629 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
1630 -o
-name
'*.symtypes' -o
-name
'modules.order' \
1631 -o
-name modules.builtin
-o
-name
'.tmp_*.o.*' \
1632 -o
-name .cache.mk \
1633 -o
-name
'*.c.[012]*.*' \
1635 -o
-name
'*.gcno' \
) -type f
-print | xargs
rm -f
1637 # Generate tags for editors
1638 # ---------------------------------------------------------------------------
1639 quiet_cmd_tags
= GEN
$@
1640 cmd_tags
= $(CONFIG_SHELL
) $(srctree
)/scripts
/tags.sh
$@
1642 tags TAGS cscope gtags
: FORCE
1645 # Scripts to check various things for consistency
1646 # ---------------------------------------------------------------------------
1648 PHONY
+= includecheck versioncheck coccicheck namespacecheck export_report
1651 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1652 -name
'*.[hcS]' -type f
-print |
sort \
1653 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkincludes.pl
1656 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1657 -name
'*.[hcS]' -type f
-print |
sort \
1658 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkversion.pl
1661 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/$@
1664 $(PERL
) $(srctree
)/scripts
/namespace.pl
1667 $(PERL
) $(srctree
)/scripts
/export_report.pl
1669 endif #ifeq ($(config-targets),1)
1670 endif #ifeq ($(mixed-targets),1)
1672 PHONY
+= checkstack kernelrelease kernelversion image_name
1674 # UML needs a little special treatment here. It wants to use the host
1675 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1676 # else wants $(ARCH), including people doing cross-builds, which means
1677 # that $(SUBARCH) doesn't work here.
1679 CHECKSTACK_ARCH
:= $(SUBARCH
)
1681 CHECKSTACK_ARCH
:= $(ARCH
)
1684 $(OBJDUMP
) -d vmlinux
$$(find .
-name
'*.ko') | \
1685 $(PERL
) $(src
)/scripts
/checkstack.pl
$(CHECKSTACK_ARCH
)
1688 @echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1691 @echo
$(KERNELVERSION
)
1694 @echo
$(KBUILD_IMAGE
)
1696 # Clear a bunch of variables before executing the submake
1698 $(Q
)mkdir
-p
$(objtree
)/tools
1699 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(src
)/tools
/
1702 $(Q
)mkdir
-p
$(objtree
)/tools
1703 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(src
)/tools
/ $*
1706 # ---------------------------------------------------------------------------
1707 # Single targets are compatible with:
1708 # - build with mixed source and output
1709 # - build with separate output dir 'make O=...'
1710 # - external modules
1712 # target-dir => where to store outputfile
1713 # build-dir => directory in kernel source tree to use
1715 ifeq ($(KBUILD_EXTMOD
),)
1716 build-dir
= $(patsubst %/,%,$(dir $@
))
1717 target-dir
= $(dir $@
)
1719 zap-slash
=$(filter-out .
,$(patsubst %/,%,$(dir $@
)))
1720 build-dir
= $(KBUILD_EXTMOD
)$(if
$(zap-slash
),/$(zap-slash
))
1721 target-dir
= $(if
$(KBUILD_EXTMOD
),$(dir $<),$(dir $@
))
1724 %.s
: %.c prepare scripts FORCE
1725 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1726 %.i
: %.c prepare scripts FORCE
1727 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1728 %.o
: %.c prepare scripts FORCE
1729 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1730 %.lst
: %.c prepare scripts FORCE
1731 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1732 %.s
: %.S prepare scripts FORCE
1733 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1734 %.o
: %.S prepare scripts FORCE
1735 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1736 %.symtypes
: %.c prepare scripts FORCE
1737 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1738 %.ll
: %.c prepare scripts FORCE
1739 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1742 /: prepare scripts FORCE
1744 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1745 $(build
)=$(build-dir
)
1746 # Make sure the latest headers are built for Documentation
1747 Documentation
/ samples
/: headers_install
1748 %/: prepare scripts FORCE
1750 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1751 $(build
)=$(build-dir
)
1752 %.ko
: prepare scripts FORCE
1754 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1755 $(build
)=$(build-dir
) $(@
:.ko
=.o
)
1756 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1758 # FIXME Should go into a make.lib or something
1759 # ===========================================================================
1761 quiet_cmd_rmdirs
= $(if
$(wildcard $(rm-dirs
)),CLEAN
$(wildcard $(rm-dirs
)))
1762 cmd_rmdirs
= rm -rf
$(rm-dirs
)
1764 quiet_cmd_rmfiles
= $(if
$(wildcard $(rm-files
)),CLEAN
$(wildcard $(rm-files
)))
1765 cmd_rmfiles
= rm -f
$(rm-files
)
1767 # Run depmod only if we have System.map and depmod is executable
1768 quiet_cmd_depmod
= DEPMOD
$(KERNELRELEASE
)
1769 cmd_depmod
= $(CONFIG_SHELL
) $(srctree
)/scripts
/depmod.sh
$(DEPMOD
) \
1770 $(KERNELRELEASE
) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1772 # Create temporary dir for module support files
1773 # clean it up only when building all modules
1774 cmd_crmodverdir
= $(Q
)mkdir
-p
$(MODVERDIR
) \
1775 $(if
$(KBUILD_MODULES
),; rm -f
$(MODVERDIR
)/*)
1777 # read all saved command lines
1779 cmd_files
:= $(wildcard .
*.cmd
$(foreach f
,$(sort $(targets
)),$(dir $(f
)).
$(notdir $(f
)).cmd
))
1781 ifneq ($(cmd_files
),)
1782 $(cmd_files
): ; # Do not try to update included dependency files
1783 include $(cmd_files
)
1786 endif # skip-makefile
1791 # Declare the contents of the .PHONY variable as phony. We keep that
1792 # information in a variable so we can use it in if_changed and friends.