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 # We are using a recursive build, so we need to do a little thinking
19 # to get the ordering right.
21 # Most importantly: sub-Makefiles should only ever modify files in
22 # their own directory. If in some directory we have a dependency on
23 # a file in another dir (which doesn't happen often, but it's often
24 # unavoidable when linking the built-in.a targets which finally
25 # turn into vmlinux), we will call a sub make in that other dir, and
26 # after that we are sure that everything which is in that other dir
29 # The only cases where we need to modify files which have global
30 # effects are thus separated out and done before the recursive
31 # descending is started. They are now explicitly listed as the
34 # Ugly workaround for Debian make-kpkg:
35 # make-kpkg directly includes the top Makefile of Linux kernel. In such a case,
36 # skip sub-make to support debian_* targets in ruleset/kernel_version.mk, but
37 # displays warning to discourage such abusage.
38 ifneq ($(word 2, $(MAKEFILE_LIST
)),)
39 $(warning Do not
include top Makefile of Linux Kernel
)
44 ifneq ($(sub-make-done
),1)
46 # Do not use make's built-in rules and variables
47 # (this increases performance and avoids hard-to-debug behaviour)
50 # 'MAKEFLAGS += -rR' does not become immediately effective for old
51 # GNU Make versions. Cancel implicit rules for this Makefile.
52 $(lastword
$(MAKEFILE_LIST
)): ;
54 # Avoid funny character set dependencies
58 export LC_COLLATE LC_NUMERIC
60 # Avoid interference with shell env settings
64 # ---------------------------------------------------------------------------
66 # Normally, we echo the whole command before executing it. By making
67 # that echo $($(quiet)$(cmd)), we now have the possibility to set
68 # $(quiet) to choose other forms of output instead, e.g.
70 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
71 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
73 # If $(quiet) is empty, the whole command will be printed.
74 # If it is set to "quiet_", only the short version will be printed.
75 # If it is set to "silent_", nothing will be printed at all, since
76 # the variable $(silent_cmd_cc_o_c) doesn't exist.
78 # A simple variant is to prefix commands with $(Q) - that's useful
79 # for commands that shall be hidden in non-verbose mode.
83 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
84 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
86 # To put more focus on warnings, be less verbose as default
87 # Use 'make V=1' to see the full commands
89 ifeq ("$(origin V)", "command line")
96 ifeq ($(KBUILD_VERBOSE
),1)
104 # If the user is running make -s (silent mode), suppress echoing of
107 ifneq ($(findstring s
,$(filter-out --%,$(MAKEFLAGS
))),)
111 export quiet Q KBUILD_VERBOSE
113 # kbuild supports saving output files in a separate directory.
114 # To locate output files in a separate directory two syntaxes are supported.
115 # In both cases the working directory must be the root of the kernel src.
117 # Use "make O=dir/to/store/output/files/"
119 # 2) Set KBUILD_OUTPUT
120 # Set the environment variable KBUILD_OUTPUT to point to the directory
121 # where the output files shall be placed.
122 # export KBUILD_OUTPUT=dir/to/store/output/files/
125 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
128 # KBUILD_SRC is not intended to be used by the regular user (for now),
129 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
131 # OK, Make called in directory where kernel src resides
132 # Do we want to locate output files in a separate directory?
133 ifeq ("$(origin O)", "command line")
134 KBUILD_OUTPUT
:= $(O
)
137 ifneq ($(words $(subst :, ,$(CURDIR
))), 1)
138 $(error main directory cannot contain spaces nor colons
)
141 ifneq ($(KBUILD_OUTPUT
),)
142 # check that the output directory actually exists
143 saved-output
:= $(KBUILD_OUTPUT
)
144 KBUILD_OUTPUT
:= $(shell mkdir
-p
$(KBUILD_OUTPUT
) && cd
$(KBUILD_OUTPUT
) \
146 $(if
$(KBUILD_OUTPUT
),, \
147 $(error failed to create output directory
"$(saved-output)"))
149 # Look for make include files relative to root of kernel src
151 # This does not become effective immediately because MAKEFLAGS is re-parsed
152 # once after the Makefile is read. It is OK since we are going to invoke
154 MAKEFLAGS
+= --include-dir
=$(CURDIR
)
158 # Do not print "Entering directory ..." at all for in-tree build.
159 MAKEFLAGS
+= --no-print-directory
161 endif # ifneq ($(KBUILD_OUTPUT),)
163 PHONY
+= $(MAKECMDGOALS
) sub-make
165 $(filter-out _all sub-make
$(CURDIR
)/Makefile
, $(MAKECMDGOALS
)) _all
: sub-make
168 # Invoke a second make in the output directory, passing relevant variables
170 $(Q
)$(MAKE
) sub-make-done
=1 \
171 $(if
$(KBUILD_OUTPUT
),-C
$(KBUILD_OUTPUT
) KBUILD_SRC
=$(CURDIR
)) \
172 -f
$(CURDIR
)/Makefile
$(filter-out _all sub-make
,$(MAKECMDGOALS
))
175 # We process the rest of the Makefile if this is the final invocation of make
177 # Do not print "Entering directory ...",
178 # but we want to display it when entering to the output directory
179 # so that IDEs/editors are able to understand relative filenames.
180 MAKEFLAGS
+= --no-print-directory
182 # Call a source code checker (by default, "sparse") as part of the
185 # Use 'make C=1' to enable checking of only re-compiled files.
186 # Use 'make C=2' to enable checking of *all* source files, regardless
187 # of whether they are re-compiled or not.
189 # See the file "Documentation/dev-tools/sparse.rst" for more details,
190 # including where to get the "sparse" utility.
192 ifeq ("$(origin C)", "command line")
193 KBUILD_CHECKSRC
= $(C
)
195 ifndef KBUILD_CHECKSRC
199 # Use make M=dir to specify directory of external module to build
200 # Old syntax make ... SUBDIRS=$PWD is still supported
201 # Setting the environment variable KBUILD_EXTMOD take precedence
203 $(warning
================= WARNING
================)
204 $(warning
'SUBDIRS' will be removed after Linux
5.3)
205 $(warning Please use
'M=' or
'KBUILD_EXTMOD' instead
)
206 $(warning
==========================================)
207 KBUILD_EXTMOD ?
= $(SUBDIRS
)
210 ifeq ("$(origin M)", "command line")
211 KBUILD_EXTMOD
:= $(M
)
214 ifeq ($(KBUILD_SRC
),)
215 # building in the source tree
218 ifeq ($(KBUILD_SRC
)/,$(dir $(CURDIR
)))
219 # building in a subdirectory of the source tree
222 srctree
:= $(KBUILD_SRC
)
226 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
234 export srctree objtree VPATH
236 # To make sure we do not include .config for any of the *config targets
237 # catch them early, and hand them over to scripts/kconfig/Makefile
238 # It is allowed to specify more targets when calling make, including
239 # mixing *config targets and build targets.
240 # For example 'make oldconfig all'.
241 # Detect when mixed targets is specified, and make a second invocation
242 # of make so .config is not included in this case either (for *config).
244 version_h
:= include/generated
/uapi
/linux
/version.h
245 old_version_h
:= include/linux
/version.h
247 clean-targets
:= %clean mrproper cleandocs
248 no-dot-config-targets
:= $(clean-targets
) \
249 cscope gtags TAGS
tags help
% %docs
check% coccicheck \
250 $(version_h
) headers_
% archheaders archscripts \
251 %asm-generic kernelversion
%src-pkg
252 no-sync-config-targets
:= $(no-dot-config-targets
) install %install \
260 ifneq ($(filter $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
261 ifeq ($(filter-out $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
266 ifneq ($(filter $(no-sync-config-targets
), $(MAKECMDGOALS
)),)
267 ifeq ($(filter-out $(no-sync-config-targets
), $(MAKECMDGOALS
)),)
272 ifneq ($(KBUILD_EXTMOD
),)
276 ifeq ($(KBUILD_EXTMOD
),)
277 ifneq ($(filter config
%config
,$(MAKECMDGOALS
)),)
279 ifneq ($(words $(MAKECMDGOALS
)),1)
285 # For "make -j clean all", "make -j mrproper defconfig all", etc.
286 ifneq ($(filter $(clean-targets
),$(MAKECMDGOALS
)),)
287 ifneq ($(filter-out $(clean-targets
),$(MAKECMDGOALS
)),)
292 # install and modules_install need also be processed one by one
293 ifneq ($(filter install,$(MAKECMDGOALS
)),)
294 ifneq ($(filter modules_install
,$(MAKECMDGOALS
)),)
299 ifeq ($(mixed-targets
),1)
300 # ===========================================================================
301 # We're called with mixed targets (*config and build targets).
302 # Handle them one by one.
304 PHONY
+= $(MAKECMDGOALS
) __build_one_by_one
306 $(filter-out __build_one_by_one
, $(MAKECMDGOALS
)): __build_one_by_one
311 for i in
$(MAKECMDGOALS
); do \
312 $(MAKE
) -f
$(srctree
)/Makefile
$$i; \
317 include scripts
/Kbuild.
include
319 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
320 KERNELRELEASE
= $(shell cat
include/config
/kernel.release
2> /dev
/null
)
321 KERNELVERSION
= $(VERSION
)$(if
$(PATCHLEVEL
),.
$(PATCHLEVEL
)$(if
$(SUBLEVEL
),.
$(SUBLEVEL
)))$(EXTRAVERSION
)
322 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
324 include scripts
/subarch.
include
326 # Cross compiling and selecting different set of gcc/bin-utils
327 # ---------------------------------------------------------------------------
329 # When performing cross compilation for other architectures ARCH shall be set
330 # to the target architecture. (See arch/* for the possibilities).
331 # ARCH can be set during invocation of make:
333 # Another way is to have ARCH set in the environment.
334 # The default ARCH is the host where make is executed.
336 # CROSS_COMPILE specify the prefix used for all executables used
337 # during compilation. Only gcc and related bin-utils executables
338 # are prefixed with $(CROSS_COMPILE).
339 # CROSS_COMPILE can be set on the command line
340 # make CROSS_COMPILE=ia64-linux-
341 # Alternatively CROSS_COMPILE can be set in the environment.
342 # Default value for CROSS_COMPILE is not to prefix executables
343 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
346 # Architecture as present in compile.h
347 UTS_MACHINE
:= $(ARCH
)
350 # Additional ARCH settings for x86
354 ifeq ($(ARCH
),x86_64
)
358 # Additional ARCH settings for sparc
359 ifeq ($(ARCH
),sparc32
)
362 ifeq ($(ARCH
),sparc64
)
366 # Additional ARCH settings for sh
371 KCONFIG_CONFIG ?
= .config
372 export KCONFIG_CONFIG
374 # SHELL used by kbuild
375 CONFIG_SHELL
:= $(shell if
[ -x
"$$BASH" ]; then echo
$$BASH; \
376 else if
[ -x
/bin
/bash
]; then echo
/bin
/bash
; \
377 else echo sh
; fi
; fi
)
379 HOST_LFS_CFLAGS
:= $(shell getconf LFS_CFLAGS
2>/dev
/null
)
380 HOST_LFS_LDFLAGS
:= $(shell getconf LFS_LDFLAGS
2>/dev
/null
)
381 HOST_LFS_LIBS
:= $(shell getconf LFS_LIBS
2>/dev
/null
)
385 KBUILD_HOSTCFLAGS
:= -Wall
-Wmissing-prototypes
-Wstrict-prototypes
-O2 \
386 -fomit-frame-pointer
-std
=gnu89
$(HOST_LFS_CFLAGS
) \
388 KBUILD_HOSTCXXFLAGS
:= -O2
$(HOST_LFS_CFLAGS
) $(HOSTCXXFLAGS
)
389 KBUILD_HOSTLDFLAGS
:= $(HOST_LFS_LDFLAGS
) $(HOSTLDFLAGS
)
390 KBUILD_HOSTLDLIBS
:= $(HOST_LFS_LIBS
) $(HOSTLDLIBS
)
392 # Make variables (CC, etc...)
393 AS
= $(CROSS_COMPILE
)as
394 LD
= $(CROSS_COMPILE
)ld
395 CC
= $(CROSS_COMPILE
)gcc
397 AR
= $(CROSS_COMPILE
)ar
398 NM
= $(CROSS_COMPILE
)nm
399 STRIP
= $(CROSS_COMPILE
)strip
400 OBJCOPY
= $(CROSS_COMPILE
)objcopy
401 OBJDUMP
= $(CROSS_COMPILE
)objdump
406 INSTALLKERNEL
:= installkernel
407 DEPMOD
= /sbin
/depmod
414 CHECKFLAGS
:= -D__linux__
-Dlinux
-D__STDC__
-Dunix
-D__unix__ \
415 -Wbitwise
-Wno-return-void
-Wno-unknown-attribute
$(CF
)
424 # Use USERINCLUDE when you must reference the UAPI directories only.
426 -I
$(srctree
)/arch
/$(SRCARCH
)/include/uapi \
427 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated
/uapi \
428 -I
$(srctree
)/include/uapi \
429 -I
$(objtree
)/include/generated
/uapi \
430 -include $(srctree
)/include/linux
/kconfig.h
432 # Use LINUXINCLUDE when you must reference the include/ directory.
433 # Needed to be compatible with the O= option
435 -I
$(srctree
)/arch
/$(SRCARCH
)/include \
436 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated \
437 $(if
$(KBUILD_SRC
), -I
$(srctree
)/include) \
438 -I
$(objtree
)/include \
441 KBUILD_AFLAGS
:= -D__ASSEMBLY__
-fno-PIE
442 KBUILD_CFLAGS
:= -Wall
-Wundef
-Werror
=strict-prototypes
-Wno-trigraphs \
443 -fno-strict-aliasing
-fno-common
-fshort-wchar
-fno-PIE \
444 -Werror
=implicit-function-declaration
-Werror
=implicit-int \
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
454 GCC_PLUGINS_CFLAGS
:=
456 export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
457 export CPP AR NM STRIP OBJCOPY OBJDUMP PAHOLE KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
458 export MAKE LEX YACC AWK INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
459 export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
461 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_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_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
466 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
467 export KBUILD_ARFLAGS
469 # When compiling out-of-tree modules, put MODVERDIR in the module
470 # tree rather than in the kernel tree. The kernel tree might
472 export MODVERDIR
:= $(if
$(KBUILD_EXTMOD
),$(firstword $(KBUILD_EXTMOD
))/).tmp_versions
474 # Files to ignore in find ... statements
476 export RCS_FIND_IGNORE
:= \
( -name SCCS
-o
-name BitKeeper
-o
-name .svn
-o \
477 -name CVS
-o
-name .
pc -o
-name .hg
-o
-name .git \
) \
479 export RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn \
480 --exclude CVS
--exclude .
pc --exclude .hg
--exclude .git
482 # ===========================================================================
483 # Rules shared between *config targets and build targets
485 # Basic helpers built in scripts/basic/
486 PHONY
+= scripts_basic
488 $(Q
)$(MAKE
) $(build
)=scripts
/basic
489 $(Q
)rm -f .tmp_quiet_recordmcount
491 PHONY
+= outputmakefile
492 # outputmakefile generates a Makefile in the output directory, if using a
493 # separate output directory. This allows convenient use of make in the
495 # At the same time when output Makefile generated, generate .gitignore to
496 # ignore whole output directory
498 ifneq ($(KBUILD_SRC
),)
499 $(Q
)ln
-fsn
$(srctree
) source
500 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/mkmakefile
$(srctree
)
501 $(Q
){ echo
"# this is build directory, ignore it"; echo
"*"; } > .gitignore
504 ifneq ($(shell $(CC
) --version
2>&1 | head
-n
1 | grep clang
),)
505 ifneq ($(CROSS_COMPILE
),)
506 CLANG_FLAGS
:= --target
=$(notdir $(CROSS_COMPILE
:%-=%))
507 GCC_TOOLCHAIN_DIR
:= $(dir $(shell which
$(CROSS_COMPILE
)elfedit
))
508 CLANG_FLAGS
+= --prefix=$(GCC_TOOLCHAIN_DIR
)
509 GCC_TOOLCHAIN
:= $(realpath
$(GCC_TOOLCHAIN_DIR
)/..
)
511 ifneq ($(GCC_TOOLCHAIN
),)
512 CLANG_FLAGS
+= --gcc-toolchain
=$(GCC_TOOLCHAIN
)
514 CLANG_FLAGS
+= -no-integrated-as
515 KBUILD_CFLAGS
+= $(CLANG_FLAGS
)
516 KBUILD_AFLAGS
+= $(CLANG_FLAGS
)
520 RETPOLINE_CFLAGS_GCC
:= -mindirect-branch
=thunk-extern
-mindirect-branch-register
521 RETPOLINE_VDSO_CFLAGS_GCC
:= -mindirect-branch
=thunk-inline
-mindirect-branch-register
522 RETPOLINE_CFLAGS_CLANG
:= -mretpoline-external-thunk
523 RETPOLINE_VDSO_CFLAGS_CLANG
:= -mretpoline
524 RETPOLINE_CFLAGS
:= $(call cc-option
,$(RETPOLINE_CFLAGS_GCC
),$(call cc-option
,$(RETPOLINE_CFLAGS_CLANG
)))
525 RETPOLINE_VDSO_CFLAGS
:= $(call cc-option
,$(RETPOLINE_VDSO_CFLAGS_GCC
),$(call cc-option
,$(RETPOLINE_VDSO_CFLAGS_CLANG
)))
526 export RETPOLINE_CFLAGS
527 export RETPOLINE_VDSO_CFLAGS
529 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
530 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
531 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
532 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
533 CC_VERSION_TEXT
= $(shell $(CC
) --version | head
-n
1)
535 ifeq ($(config-targets
),1)
536 # ===========================================================================
537 # *config targets only - make sure prerequisites are updated, and descend
538 # in scripts/kconfig to make the *config target
540 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
541 # KBUILD_DEFCONFIG may point out an alternative default configuration
542 # used for 'make defconfig'
543 include arch
/$(SRCARCH
)/Makefile
544 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
546 config
: scripts_basic outputmakefile FORCE
547 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
549 %config
: scripts_basic outputmakefile FORCE
550 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
553 # ===========================================================================
554 # Build targets only - this includes vmlinux, arch specific targets, clean
555 # targets and others. In general all targets except *config targets.
557 # If building an external module we do not care about the all: rule
558 # but instead _all depend on modules
560 ifeq ($(KBUILD_EXTMOD
),)
566 # Decide whether to build built-in, modular, or both.
567 # Normally, just do built-in.
572 # If we have only "make modules", don't compile built-in objects.
573 # When we're building modules with modversions, we need to consider
574 # the built-in objects during the descend as well, in order to
575 # make sure the checksums are up to date before we record them.
577 ifeq ($(MAKECMDGOALS
),modules
)
578 KBUILD_BUILTIN
:= $(if
$(CONFIG_MODVERSIONS
),1)
581 # If we have "make <whatever> modules", compile modules
582 # in addition to whatever we do anyway.
583 # Just "make" or "make all" shall build modules as well
585 ifneq ($(filter all _all modules
,$(MAKECMDGOALS
)),)
589 ifeq ($(MAKECMDGOALS
),)
593 export KBUILD_MODULES KBUILD_BUILTIN
595 ifeq ($(KBUILD_EXTMOD
),)
596 # Objects we will link into vmlinux / subdirs we need to visit
598 drivers-y
:= drivers
/ sound
/
603 endif # KBUILD_EXTMOD
605 ifeq ($(dot-config
),1)
606 include include/config
/auto.conf
609 # The all: target is the default when no target is given on the
611 # This allow a user to issue only 'make' to build a kernel including modules
612 # Defaults to vmlinux, but the arch makefile usually adds further targets
615 CFLAGS_GCOV
:= -fprofile-arcs
-ftest-coverage \
616 $(call cc-option
,-fno-tree-loop-im
) \
617 $(call cc-disable-warning
,maybe-uninitialized
,)
620 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
621 ifdef CONFIG_FUNCTION_TRACER
622 CC_FLAGS_FTRACE
:= -pg
625 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
626 # values of the respective KBUILD_* variables
630 include arch
/$(SRCARCH
)/Makefile
632 ifeq ($(dot-config
),1)
633 ifeq ($(may-sync-config
),1)
634 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
635 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
636 # because some architectures define CROSS_COMPILE there.
637 -include include/config
/auto.conf.cmd
641 @echo
>&2 '*** Configuration file "$@" not found!'
643 @echo
>&2 '*** Please run some configurator (e.g. "make oldconfig" or'
644 @echo
>&2 '*** "make menuconfig" or "make xconfig").'
648 # The actual configuration files used during the build are stored in
649 # include/generated/ and include/config/. Update them if .config is newer than
650 # include/config/auto.conf (which mirrors .config).
652 # This exploits the 'multi-target pattern rule' trick.
653 # The syncconfig should be executed only once to make all the targets.
654 %/auto.conf
%/auto.conf.cmd
%/tristate.conf
: $(KCONFIG_CONFIG
)
655 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile syncconfig
657 # External modules and some install targets need include/generated/autoconf.h
658 # and include/config/auto.conf but do not care if they are up-to-date.
659 # Use auto.conf to trigger the test
660 PHONY
+= include/config
/auto.conf
662 include/config
/auto.conf
:
663 $(Q
)test -e
include/generated
/autoconf.h
-a
-e
$@ ||
( \
665 echo
>&2 " ERROR: Kernel configuration is invalid."; \
666 echo
>&2 " include/generated/autoconf.h or $@ are missing.";\
667 echo
>&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
671 endif # may-sync-config
672 endif # $(dot-config)
674 KBUILD_CFLAGS
+= $(call cc-option
,-fno-delete-null-pointer-checks
,)
675 KBUILD_CFLAGS
+= $(call cc-disable-warning
,frame-address
,)
676 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-truncation
)
677 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-overflow
)
678 KBUILD_CFLAGS
+= $(call cc-disable-warning
, int-in-bool-context
)
680 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
681 KBUILD_CFLAGS
+= $(call cc-option
,-Oz
,-Os
)
686 ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
687 KBUILD_CFLAGS
+= -Wno-maybe-uninitialized
690 # Tell gcc to never replace conditional load with a non-conditional one
691 KBUILD_CFLAGS
+= $(call cc-option
,--param
=allow-store-data-races
=0)
693 include scripts
/Makefile.kcov
694 include scripts
/Makefile.gcc-plugins
696 ifdef CONFIG_READABLE_ASM
697 # Disable optimizations that make assembler listings hard to read.
698 # reorder blocks reorders the control in the function
699 # ipa clone creates specialized cloned functions
700 # partial inlining inlines only parts of functions
701 KBUILD_CFLAGS
+= $(call cc-option
,-fno-reorder-blocks
,) \
702 $(call cc-option
,-fno-ipa-cp-clone
,) \
703 $(call cc-option
,-fno-partial-inlining
)
706 ifneq ($(CONFIG_FRAME_WARN
),0)
707 KBUILD_CFLAGS
+= $(call cc-option
,-Wframe-larger-than
=${CONFIG_FRAME_WARN})
710 stackp-flags-
$(CONFIG_CC_HAS_STACKPROTECTOR_NONE
) := -fno-stack-protector
711 stackp-flags-
$(CONFIG_STACKPROTECTOR
) := -fstack-protector
712 stackp-flags-
$(CONFIG_STACKPROTECTOR_STRONG
) := -fstack-protector-strong
714 KBUILD_CFLAGS
+= $(stackp-flags-y
)
716 ifdef CONFIG_CC_IS_CLANG
717 KBUILD_CPPFLAGS
+= $(call cc-option
,-Qunused-arguments
,)
718 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-invalid-specifier
)
719 KBUILD_CFLAGS
+= $(call cc-disable-warning
, gnu
)
720 KBUILD_CFLAGS
+= $(call cc-disable-warning
, address-of-packed-member
)
721 # Quiet clang warning: comparison of unsigned expression < 0 is always false
722 KBUILD_CFLAGS
+= $(call cc-disable-warning
, tautological-compare
)
723 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
724 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
725 # See modpost pattern 2
726 KBUILD_CFLAGS
+= $(call cc-option
, -mno-global-merge
,)
727 KBUILD_CFLAGS
+= $(call cc-option
, -fcatch-undefined-behavior
)
730 # These warnings generated too much noise in a regular build.
731 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
732 KBUILD_CFLAGS
+= -Wno-unused-but-set-variable
735 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-const-variable
)
736 ifdef CONFIG_FRAME_POINTER
737 KBUILD_CFLAGS
+= -fno-omit-frame-pointer
-fno-optimize-sibling-calls
739 # Some targets (ARM with Thumb2, for example), can't be built with frame
740 # pointers. For those, we don't have FUNCTION_TRACER automatically
741 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
742 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
743 # -fomit-frame-pointer with FUNCTION_TRACER.
744 ifndef CONFIG_FUNCTION_TRACER
745 KBUILD_CFLAGS
+= -fomit-frame-pointer
749 DEBUG_CFLAGS
:= $(call cc-option
, -fno-var-tracking-assignments
)
751 ifdef CONFIG_DEBUG_INFO
752 ifdef CONFIG_DEBUG_INFO_SPLIT
753 DEBUG_CFLAGS
+= -gsplit-dwarf
757 KBUILD_AFLAGS
+= -Wa
,-gdwarf-2
759 ifdef CONFIG_DEBUG_INFO_DWARF4
760 DEBUG_CFLAGS
+= -gdwarf-4
763 ifdef CONFIG_DEBUG_INFO_REDUCED
764 DEBUG_CFLAGS
+= $(call cc-option
, -femit-struct-debug-baseonly
) \
765 $(call cc-option
,-fno-var-tracking
)
768 KBUILD_CFLAGS
+= $(DEBUG_CFLAGS
)
771 ifdef CONFIG_FUNCTION_TRACER
772 ifdef CONFIG_FTRACE_MCOUNT_RECORD
773 # gcc 5 supports generating the mcount tables directly
774 ifeq ($(call cc-option-yn
,-mrecord-mcount
),y
)
775 CC_FLAGS_FTRACE
+= -mrecord-mcount
776 export CC_USING_RECORD_MCOUNT
:= 1
778 ifdef CONFIG_HAVE_NOP_MCOUNT
779 ifeq ($(call cc-option-yn
, -mnop-mcount
),y
)
780 CC_FLAGS_FTRACE
+= -mnop-mcount
781 CC_FLAGS_USING
+= -DCC_USING_NOP_MCOUNT
785 ifdef CONFIG_HAVE_FENTRY
786 ifeq ($(call cc-option-yn
, -mfentry
),y
)
787 CC_FLAGS_FTRACE
+= -mfentry
788 CC_FLAGS_USING
+= -DCC_USING_FENTRY
791 export CC_FLAGS_FTRACE
792 KBUILD_CFLAGS
+= $(CC_FLAGS_FTRACE
) $(CC_FLAGS_USING
)
793 KBUILD_AFLAGS
+= $(CC_FLAGS_USING
)
794 ifdef CONFIG_DYNAMIC_FTRACE
795 ifdef CONFIG_HAVE_C_RECORDMCOUNT
796 BUILD_C_RECORDMCOUNT
:= y
797 export BUILD_C_RECORDMCOUNT
802 # We trigger additional mismatches with less inlining
803 ifdef CONFIG_DEBUG_SECTION_MISMATCH
804 KBUILD_CFLAGS
+= $(call cc-option
, -fno-inline-functions-called-once
)
807 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
808 KBUILD_CFLAGS_KERNEL
+= -ffunction-sections
-fdata-sections
809 LDFLAGS_vmlinux
+= --gc-sections
812 # arch Makefile may override CC so keep this after arch Makefile is included
813 NOSTDINC_FLAGS
+= -nostdinc
-isystem
$(shell $(CC
) -print-file-name
=include)
815 # warn about C99 declaration after statement
816 KBUILD_CFLAGS
+= -Wdeclaration-after-statement
818 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
819 KBUILD_CFLAGS
+= $(call cc-option
,-Wvla
)
821 # disable pointer signed / unsigned warnings in gcc 4.0
822 KBUILD_CFLAGS
+= -Wno-pointer-sign
824 # disable stringop warnings in gcc 8+
825 KBUILD_CFLAGS
+= $(call cc-disable-warning
, stringop-truncation
)
827 # disable invalid "can't wrap" optimizations for signed / pointers
828 KBUILD_CFLAGS
+= $(call cc-option
,-fno-strict-overflow
)
830 # clang sets -fmerge-all-constants by default as optimization, but this
831 # is non-conforming behavior for C and in fact breaks the kernel, so we
832 # need to disable it here generally.
833 KBUILD_CFLAGS
+= $(call cc-option
,-fno-merge-all-constants
)
835 # for gcc -fno-merge-all-constants disables everything, but it is fine
836 # to have actual conforming behavior enabled.
837 KBUILD_CFLAGS
+= $(call cc-option
,-fmerge-constants
)
839 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
840 KBUILD_CFLAGS
+= $(call cc-option
,-fno-stack-check
,)
842 # conserve stack if available
843 KBUILD_CFLAGS
+= $(call cc-option
,-fconserve-stack
)
845 # Prohibit date/time macros, which would make the build non-deterministic
846 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=date-time
)
848 # enforce correct pointer usage
849 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=incompatible-pointer-types
)
851 # Require designated initializers for all marked structures
852 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=designated-init
)
854 # change __FILE__ to the relative path from the srctree
855 KBUILD_CFLAGS
+= $(call cc-option
,-fmacro-prefix-map
=$(srctree
)/=)
857 # use the deterministic mode of AR if available
858 KBUILD_ARFLAGS
:= $(call ar-option
,D
)
860 include scripts
/Makefile.kasan
861 include scripts
/Makefile.extrawarn
862 include scripts
/Makefile.ubsan
864 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
866 KBUILD_CPPFLAGS
+= $(ARCH_CPPFLAGS
) $(KCPPFLAGS
)
867 KBUILD_AFLAGS
+= $(ARCH_AFLAGS
) $(KAFLAGS
)
868 KBUILD_CFLAGS
+= $(ARCH_CFLAGS
) $(KCFLAGS
)
870 # Use --build-id when available.
871 LDFLAGS_BUILD_ID
:= $(call ld-option
, --build-id
)
872 KBUILD_LDFLAGS_MODULE
+= $(LDFLAGS_BUILD_ID
)
873 LDFLAGS_vmlinux
+= $(LDFLAGS_BUILD_ID
)
875 ifeq ($(CONFIG_STRIP_ASM_SYMS
),y
)
876 LDFLAGS_vmlinux
+= $(call ld-option
, -X
,)
879 # insure the checker run with the right endianness
880 CHECKFLAGS
+= $(if
$(CONFIG_CPU_BIG_ENDIAN
),-mbig-endian
,-mlittle-endian
)
882 # the checker needs the correct machine size
883 CHECKFLAGS
+= $(if
$(CONFIG_64BIT
),-m64
,-m32
)
885 # Default kernel image to build when no specific target is given.
886 # KBUILD_IMAGE may be overruled on the command line or
887 # set in the environment
888 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
890 export KBUILD_IMAGE ?
= vmlinux
893 # INSTALL_PATH specifies where to place the updated kernel and system map
894 # images. Default is /boot, but you can set it to other values
895 export INSTALL_PATH ?
= /boot
898 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
899 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
900 # an argument if needed. Otherwise it defaults to the kernel install path
902 export INSTALL_DTBS_PATH ?
= $(INSTALL_PATH
)/dtbs
/$(KERNELRELEASE
)
905 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
906 # relocations required by build roots. This is not defined in the
907 # makefile but the argument can be passed to make if needed.
910 MODLIB
= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
914 # INSTALL_MOD_STRIP, if defined, will cause modules to be
915 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
916 # the default option --strip-debug will be used. Otherwise,
917 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
919 ifdef INSTALL_MOD_STRIP
920 ifeq ($(INSTALL_MOD_STRIP
),1)
921 mod_strip_cmd
= $(STRIP
) --strip-debug
923 mod_strip_cmd
= $(STRIP
) $(INSTALL_MOD_STRIP
)
924 endif # INSTALL_MOD_STRIP=1
927 endif # INSTALL_MOD_STRIP
930 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
931 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
932 # or CONFIG_MODULE_COMPRESS_XZ.
934 mod_compress_cmd
= true
935 ifdef CONFIG_MODULE_COMPRESS
936 ifdef CONFIG_MODULE_COMPRESS_GZIP
937 mod_compress_cmd
= gzip
-n
-f
938 endif # CONFIG_MODULE_COMPRESS_GZIP
939 ifdef CONFIG_MODULE_COMPRESS_XZ
940 mod_compress_cmd
= xz
-f
941 endif # CONFIG_MODULE_COMPRESS_XZ
942 endif # CONFIG_MODULE_COMPRESS
943 export mod_compress_cmd
945 ifdef CONFIG_MODULE_SIG_ALL
946 $(eval
$(call config_filename
,MODULE_SIG_KEY
))
948 mod_sign_cmd
= scripts
/sign-file
$(CONFIG_MODULE_SIG_HASH
) $(MODULE_SIG_KEY_SRCPREFIX
)$(CONFIG_MODULE_SIG_KEY
) certs
/signing_key.x509
954 ifdef CONFIG_STACK_VALIDATION
955 has_libelf
:= $(call try-run
,\
956 echo
"int main() {}" |
$(HOSTCC
) -xc
-o
/dev
/null
-lelf
-,1,0)
957 ifeq ($(has_libelf
),1)
958 objtool_target
:= tools
/objtool FORCE
960 SKIP_STACK_VALIDATION
:= 1
961 export SKIP_STACK_VALIDATION
967 ifeq ($(KBUILD_EXTMOD
),)
968 core-y
+= kernel
/ certs
/ mm
/ fs
/ ipc
/ security
/ crypto
/ block
/
970 vmlinux-dirs
:= $(patsubst %/,%,$(filter %/, $(init-y
) $(init-m
) \
971 $(core-y
) $(core-m
) $(drivers-y
) $(drivers-m
) \
972 $(net-y
) $(net-m
) $(libs-y
) $(libs-m
) $(virt-y
)))
974 vmlinux-alldirs
:= $(sort $(vmlinux-dirs
) $(patsubst %/,%,$(filter %/, \
975 $(init-
) $(core-
) $(drivers-
) $(net-
) $(libs-
) $(virt-
))))
977 init-y
:= $(patsubst %/, %/built-in.a
, $(init-y
))
978 core-y
:= $(patsubst %/, %/built-in.a
, $(core-y
))
979 drivers-y
:= $(patsubst %/, %/built-in.a
, $(drivers-y
))
980 net-y
:= $(patsubst %/, %/built-in.a
, $(net-y
))
981 libs-y1
:= $(patsubst %/, %/lib.a
, $(libs-y
))
982 libs-y2
:= $(patsubst %/, %/built-in.a
, $(filter-out %.a
, $(libs-y
)))
983 virt-y
:= $(patsubst %/, %/built-in.a
, $(virt-y
))
985 # Externally visible symbols (used by link-vmlinux.sh)
986 export KBUILD_VMLINUX_OBJS
:= $(head-y
) $(init-y
) $(core-y
) $(libs-y2
) \
987 $(drivers-y
) $(net-y
) $(virt-y
)
988 export KBUILD_VMLINUX_LIBS
:= $(libs-y1
)
989 export KBUILD_LDS
:= arch
/$(SRCARCH
)/kernel
/vmlinux.lds
990 export LDFLAGS_vmlinux
991 # used by scripts/package/Makefile
992 export KBUILD_ALLDIRS
:= $(sort $(filter-out arch
/%,$(vmlinux-alldirs
)) arch Documentation
include samples scripts tools
)
994 vmlinux-deps
:= $(KBUILD_LDS
) $(KBUILD_VMLINUX_OBJS
) $(KBUILD_VMLINUX_LIBS
)
996 # Recurse until adjust_autoksyms.sh is satisfied
997 PHONY
+= autoksyms_recursive
998 autoksyms_recursive
: $(vmlinux-deps
)
999 ifdef CONFIG_TRIM_UNUSED_KSYMS
1000 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/adjust_autoksyms.sh \
1001 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1004 # For the kernel to actually contain only the needed exported symbols,
1005 # we have to build modules as well to determine what those symbols are.
1006 # (this can be evaluated only once include/config/auto.conf has been included)
1007 ifdef CONFIG_TRIM_UNUSED_KSYMS
1011 autoksyms_h
:= $(if
$(CONFIG_TRIM_UNUSED_KSYMS
), include/generated
/autoksyms.h
)
1014 $(Q
)mkdir
-p
$(dir $@
)
1017 ARCH_POSTLINK
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/Makefile.postlink
)
1019 # Final link of vmlinux with optional arch pass after final link
1020 cmd_link-vmlinux
= \
1021 $(CONFIG_SHELL
) $< $(LD
) $(KBUILD_LDFLAGS
) $(LDFLAGS_vmlinux
) ; \
1022 $(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) $@
, true
)
1024 vmlinux
: scripts
/link-vmlinux.sh autoksyms_recursive
$(vmlinux-deps
) FORCE
1025 +$(call if_changed
,link-vmlinux
)
1029 # Build samples along the rest of the kernel. This needs headers_install.
1030 ifdef CONFIG_SAMPLES
1031 vmlinux-dirs
+= samples
1032 samples
: headers_install
1035 # The actual objects are generated when descending,
1036 # make sure no implicit rule kicks in
1037 $(sort $(vmlinux-deps
)): $(vmlinux-dirs
) ;
1039 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1040 # Preset locale variables to speed up the build process. Limit locale
1041 # tweaks to this spot to avoid wrong language settings when running
1042 # make menuconfig etc.
1043 # Error messages still appears in the original language
1045 PHONY
+= $(vmlinux-dirs
)
1046 $(vmlinux-dirs
): prepare
1047 $(Q
)$(MAKE
) $(build
)=$@ need-builtin
=1
1049 filechk_kernel.release
= \
1050 echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1052 # Store (new) KERNELRELEASE string in include/config/kernel.release
1053 include/config
/kernel.release
: $(srctree
)/Makefile FORCE
1054 $(call filechk
,kernel.release
)
1056 # Additional helpers built in scripts/
1057 # Carefully list dependencies so we do not try to build scripts twice
1060 scripts
: scripts_basic scripts_dtc
1061 $(Q
)$(MAKE
) $(build
)=$(@
)
1063 # Things we need to do before we recursively start building the kernel
1064 # or the modules are listed in "prepare".
1065 # A multi level approach is used. prepareN is processed before prepareN-1.
1066 # archprepare is used in arch Makefiles and when processed asm symlink,
1067 # version.h and scripts_basic is processed / created.
1069 PHONY
+= prepare archprepare prepare1 prepare3
1071 # prepare3 is used to check if we are building in a separate output directory,
1073 # 1) Check that make has not been executed in the kernel src $(srctree)
1074 prepare3
: include/config
/kernel.release
1075 ifneq ($(KBUILD_SRC
),)
1076 @
$(kecho
) ' Using $(srctree) as source for kernel'
1077 $(Q
)if
[ -f
$(srctree
)/.config
-o
-d
$(srctree
)/include/config
]; then \
1078 echo
>&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1079 echo
>&2 " in the '$(srctree)' directory.";\
1084 prepare1
: prepare3 outputmakefile asm-generic
$(version_h
) $(autoksyms_h
) \
1085 include/generated
/utsrelease.h
1088 archprepare
: archheaders archscripts prepare1 scripts
1090 prepare0
: archprepare
1091 $(Q
)$(MAKE
) $(build
)=scripts
/mod
1092 $(Q
)$(MAKE
) $(build
)=.
1094 # All the preparing..
1095 prepare
: prepare0 prepare-objtool
1097 # Support for using generic headers in asm-generic
1098 asm-generic
:= -f
$(srctree
)/scripts
/Makefile.asm-generic obj
1100 PHONY
+= asm-generic uapi-asm-generic
1101 asm-generic
: uapi-asm-generic
1102 $(Q
)$(MAKE
) $(asm-generic
)=arch
/$(SRCARCH
)/include/generated
/asm \
1103 generic
=include/asm-generic
1105 $(Q
)$(MAKE
) $(asm-generic
)=arch
/$(SRCARCH
)/include/generated
/uapi
/asm \
1106 generic
=include/uapi
/asm-generic
1108 PHONY
+= prepare-objtool
1109 prepare-objtool
: $(objtool_target
)
1110 ifeq ($(SKIP_STACK_VALIDATION
),1)
1111 ifdef CONFIG_UNWINDER_ORC
1112 @echo
"error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1115 @echo
"warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1119 # Generate some files
1120 # ---------------------------------------------------------------------------
1122 # KERNELRELEASE can change from a few different places, meaning version.h
1123 # needs to be updated, so this check is forced on all builds
1126 define filechk_utsrelease.h
1127 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
1128 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1131 echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\"
1134 define filechk_version.h
1135 echo \
#define LINUX_VERSION_CODE $(shell \
1136 expr
$(VERSION
) \
* 65536 + 0$(PATCHLEVEL
) \
* 256 + 0$(SUBLEVEL
)); \
1137 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1141 $(call filechk
,version.h
)
1142 $(Q
)rm -f
$(old_version_h
)
1144 include/generated
/utsrelease.h
: include/config
/kernel.release FORCE
1145 $(call filechk
,utsrelease.h
)
1149 $(Q
)find
$(srctree
)/include/ -name
'*.h' | xargs
--max-args
1 \
1150 $(srctree
)/scripts
/headerdep.pl
-I
$(srctree
)/include
1152 # ---------------------------------------------------------------------------
1155 #Default location for installed headers
1156 export INSTALL_HDR_PATH
= $(objtree
)/usr
1158 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1159 hdr-dst
= $(if
$(KBUILD_HEADERS
), dst
=include/arch-
$(SRCARCH
), dst
=include)
1161 PHONY
+= archheaders archscripts
1164 __headers
: $(version_h
) scripts_basic uapi-asm-generic archheaders archscripts
1165 $(Q
)$(MAKE
) $(build
)=scripts build_unifdef
1167 PHONY
+= headers_install_all
1168 headers_install_all
:
1169 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
install
1171 PHONY
+= headers_install
1172 headers_install
: __headers
1173 $(if
$(wildcard $(srctree
)/arch
/$(SRCARCH
)/include/uapi
/asm
/Kbuild
),, \
1174 $(error Headers not exportable for the
$(SRCARCH
) architecture
))
1175 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi dst
=include
1176 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(SRCARCH
)/include/uapi
$(hdr-dst
)
1178 PHONY
+= headers_check_all
1179 headers_check_all
: headers_install_all
1180 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
check
1182 PHONY
+= headers_check
1183 headers_check
: headers_install
1184 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi dst
=include HDRCHECK
=1
1185 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(SRCARCH
)/include/uapi
$(hdr-dst
) HDRCHECK
=1
1187 ifdef CONFIG_HEADERS_CHECK
1191 # ---------------------------------------------------------------------------
1196 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests run_tests
1198 PHONY
+= kselftest-clean
1200 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests
clean
1202 PHONY
+= kselftest-merge
1204 $(if
$(wildcard $(objtree
)/.config
),, $(error No .config exists
, config your kernel first
!))
1205 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/kconfig
/merge_config.sh \
1206 -m
$(objtree
)/.config \
1207 $(srctree
)/tools
/testing
/selftests
/*/config
1208 +$(Q
)$(MAKE
) -f
$(srctree
)/Makefile olddefconfig
1210 # ---------------------------------------------------------------------------
1213 ifneq ($(wildcard $(srctree
)/arch
/$(SRCARCH
)/boot
/dts
/),)
1214 dtstree
:= arch
/$(SRCARCH
)/boot
/dts
1219 %.dtb
: prepare3 scripts_dtc
1220 $(Q
)$(MAKE
) $(build
)=$(dtstree
) $(dtstree
)/$@
1222 PHONY
+= dtbs dtbs_install dt_binding_check
1223 dtbs dtbs_check
: prepare3 scripts_dtc
1224 $(Q
)$(MAKE
) $(build
)=$(dtstree
)
1226 dtbs_check
: export CHECK_DTBS
=1
1227 dtbs_check
: dt_binding_check
1230 $(Q
)$(MAKE
) $(dtbinst
)=$(dtstree
)
1232 ifdef CONFIG_OF_EARLY_FLATTREE
1238 PHONY
+= scripts_dtc
1239 scripts_dtc
: scripts_basic
1240 $(Q
)$(MAKE
) $(build
)=scripts
/dtc
1242 dt_binding_check
: scripts_dtc
1243 $(Q
)$(MAKE
) $(build
)=Documentation
/devicetree
/bindings
1245 # ---------------------------------------------------------------------------
1248 ifdef CONFIG_MODULES
1250 # By default, build modules as well
1256 # A module can be listed more than once in obj-m resulting in
1257 # duplicate lines in modules.order files. Those are removed
1258 # using awk while concatenating to the final file.
1261 modules
: $(vmlinux-dirs
) $(if
$(KBUILD_BUILTIN
),vmlinux
) modules.builtin
1262 $(Q
)$(AWK
) '!x[$$0]++' $(vmlinux-dirs
:%=$(objtree
)/%/modules.order
) > $(objtree
)/modules.order
1263 @
$(kecho
) ' Building modules, stage 2.';
1264 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1266 modules.builtin
: $(vmlinux-dirs
:%=%/modules.builtin
)
1267 $(Q
)$(AWK
) '!x[$$0]++' $^
> $(objtree
)/modules.builtin
1269 %/modules.builtin
: include/config
/auto.conf
include/config
/tristate.conf
1270 $(Q
)$(MAKE
) $(modbuiltin
)=$*
1273 # Target to prepare building external modules
1274 PHONY
+= modules_prepare
1275 modules_prepare
: prepare
1277 # Target to install modules
1278 PHONY
+= modules_install
1279 modules_install
: _modinst_ _modinst_post
1283 @
rm -rf
$(MODLIB
)/kernel
1284 @
rm -f
$(MODLIB
)/source
1285 @mkdir
-p
$(MODLIB
)/kernel
1286 @ln
-s
$(abspath
$(srctree
)) $(MODLIB
)/source
1287 @if
[ ! $(objtree
) -ef
$(MODLIB
)/build
]; then \
1288 rm -f
$(MODLIB
)/build
; \
1289 ln
-s
$(CURDIR
) $(MODLIB
)/build
; \
1291 @cp
-f
$(objtree
)/modules.order
$(MODLIB
)/
1292 @cp
-f
$(objtree
)/modules.builtin
$(MODLIB
)/
1293 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1295 # This depmod is only for convenience to give the initial
1296 # boot a modules.dep even before / is mounted read-write. However the
1297 # boot script depmod is the master version.
1298 PHONY
+= _modinst_post
1299 _modinst_post
: _modinst_
1302 ifeq ($(CONFIG_MODULE_SIG
), y
)
1303 PHONY
+= modules_sign
1305 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modsign
1308 else # CONFIG_MODULES
1310 # Modules not configured
1311 # ---------------------------------------------------------------------------
1313 PHONY
+= modules modules_install
1314 modules modules_install
:
1316 @echo
>&2 "The present kernel configuration has modules disabled."
1317 @echo
>&2 "Type 'make config' and enable loadable module support."
1318 @echo
>&2 "Then build a kernel with module support enabled."
1322 endif # CONFIG_MODULES
1325 # Cleaning is done on three levels.
1326 # make clean Delete most generated files
1327 # Leave enough to build external modules
1328 # make mrproper Delete the current configuration, and all generated files
1329 # make distclean Remove editor backup files, patch leftover files and the like
1331 # Directories & files removed with 'make clean'
1332 CLEAN_DIRS
+= $(MODVERDIR
) include/ksym
1334 # Directories & files removed with 'make mrproper'
1335 MRPROPER_DIRS
+= include/config usr
/include include/generated \
1336 arch
/*/include/generated .tmp_objdiff
1337 MRPROPER_FILES
+= .config .config.old .version \
1338 Module.symvers
tags TAGS cscope
* GPATH GTAGS GRTAGS GSYMS \
1339 signing_key.pem signing_key.priv signing_key.x509 \
1340 x509.genkey extra_certificates signing_key.x509.keyid \
1341 signing_key.x509.signer vmlinux-gdb.py
1343 # clean - Delete most, but leave enough to build external modules
1345 clean: rm-dirs
:= $(CLEAN_DIRS
)
1346 clean: rm-files
:= $(CLEAN_FILES
)
1347 clean-dirs
:= $(addprefix _clean_
, .
$(vmlinux-alldirs
) Documentation samples
)
1349 PHONY
+= $(clean-dirs
) clean archclean vmlinuxclean
1351 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1354 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/link-vmlinux.sh
clean
1355 $(Q
)$(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) clean)
1357 clean: archclean vmlinuxclean
1359 # mrproper - Delete all generated files, including .config
1361 mrproper
: rm-dirs
:= $(wildcard $(MRPROPER_DIRS
))
1362 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
1363 mrproper-dirs
:= $(addprefix _mrproper_
,scripts
)
1365 PHONY
+= $(mrproper-dirs
) mrproper
1367 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
1369 mrproper
: clean $(mrproper-dirs
)
1378 @find
$(srctree
) $(RCS_FIND_IGNORE
) \
1379 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
1380 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'*%' \
1381 -o
-name
'core' \
) \
1382 -type f
-print | xargs
rm -f
1385 # Packaging of the kernel to various formats
1386 # ---------------------------------------------------------------------------
1387 package-dir
:= scripts
/package
1390 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1391 %pkg
: include/config
/kernel.release FORCE
1392 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1395 # Brief documentation of the typical targets used
1396 # ---------------------------------------------------------------------------
1398 boards
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*_defconfig
)
1399 boards
:= $(sort $(notdir $(boards
)))
1400 board-dirs
:= $(dir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*/*_defconfig
))
1401 board-dirs
:= $(sort $(notdir $(board-dirs
:/=)))
1405 @echo
'Cleaning targets:'
1406 @echo
' clean - Remove most generated files but keep the config and'
1407 @echo
' enough build support to build external modules'
1408 @echo
' mrproper - Remove all generated files + config + various backup files'
1409 @echo
' distclean - mrproper + remove editor backup and patch files'
1411 @echo
'Configuration targets:'
1412 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
1414 @echo
'Other generic targets:'
1415 @echo
' all - Build all targets marked with [*]'
1416 @echo
'* vmlinux - Build the bare kernel'
1417 @echo
'* modules - Build all modules'
1418 @echo
' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1419 @echo
' dir/ - Build all files in dir and below'
1420 @echo
' dir/file.[ois] - Build specified target only'
1421 @echo
' dir/file.ll - Build the LLVM assembly file'
1422 @echo
' (requires compiler support for LLVM assembly generation)'
1423 @echo
' dir/file.lst - Build specified mixed source/assembly target only'
1424 @echo
' (requires a recent binutils and recent build (System.map))'
1425 @echo
' dir/file.ko - Build module including final link'
1426 @echo
' modules_prepare - Set up for building external modules'
1427 @echo
' tags/TAGS - Generate tags file for editors'
1428 @echo
' cscope - Generate cscope index'
1429 @echo
' gtags - Generate GNU GLOBAL index'
1430 @echo
' kernelrelease - Output the release version string (use with make -s)'
1431 @echo
' kernelversion - Output the version stored in Makefile (use with make -s)'
1432 @echo
' image_name - Output the image name (use with make -s)'
1433 @echo
' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1434 echo
' (default: $(INSTALL_HDR_PATH))'; \
1436 @echo
'Static analysers:'
1437 @echo
' checkstack - Generate a list of stack hogs'
1438 @echo
' namespacecheck - Name space analysis on compiled kernel'
1439 @echo
' versioncheck - Sanity check on version.h usage'
1440 @echo
' includecheck - Check for duplicate included header files'
1441 @echo
' export_report - List the usages of all exported symbols'
1442 @echo
' headers_check - Sanity check on exported headers'
1443 @echo
' headerdep - Detect inclusion cycles in headers'
1444 @echo
' coccicheck - Check with Coccinelle'
1446 @echo
'Kernel selftest:'
1447 @echo
' kselftest - Build and run kernel selftest (run as root)'
1448 @echo
' Build, install, and boot kernel before'
1449 @echo
' running kselftest on it'
1450 @echo
' kselftest-clean - Remove all generated kselftest files'
1451 @echo
' kselftest-merge - Merge all the config dependencies of kselftest to existing'
1455 echo
'Devicetree:'; \
1456 echo
'* dtbs - Build device tree blobs for enabled boards'; \
1457 echo
' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1460 @echo
'Userspace tools targets:'
1461 @echo
' use "make tools/help"'
1462 @echo
' or "cd tools; make help"'
1464 @echo
'Kernel packaging:'
1465 @
$(MAKE
) $(build
)=$(package-dir
) help
1467 @echo
'Documentation targets:'
1468 @
$(MAKE
) -f
$(srctree
)/Documentation
/Makefile dochelp
1470 @echo
'Architecture specific targets ($(SRCARCH)):'
1471 @
$(if
$(archhelp
),$(archhelp
),\
1472 echo
' No architecture specific help defined for $(SRCARCH)')
1475 $(foreach b
, $(boards
), \
1476 printf
" %-24s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
1478 @
$(if
$(board-dirs
), \
1479 $(foreach b
, $(board-dirs
), \
1480 printf
" %-16s - Show %s-specific targets\\n" help-
$(b
) $(b
);) \
1481 printf
" %-16s - Show all of the above\\n" help-boards
; \
1484 @echo
' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1485 @echo
' make V=2 [targets] 2 => give reason for rebuild of target'
1486 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
1487 @echo
' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1488 @echo
' make C=2 [targets] Force check of all c source with $$CHECK'
1489 @echo
' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1490 @echo
' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1491 @echo
' 1: warnings which may be relevant and do not occur too often'
1492 @echo
' 2: warnings which occur quite often but may still be relevant'
1493 @echo
' 3: more obscure warnings, can most likely be ignored'
1494 @echo
' Multiple levels can be combined with W=12 or W=123'
1496 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
1497 @echo
'For further info see the ./README file'
1500 help-board-dirs
:= $(addprefix help-
,$(board-dirs
))
1502 help-boards
: $(help-board-dirs
)
1504 boards-per-dir
= $(sort $(notdir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/$*/*_defconfig
)))
1506 $(help-board-dirs
): help-
%:
1507 @echo
'Architecture specific targets ($(SRCARCH) $*):'
1508 @
$(if
$(boards-per-dir
), \
1509 $(foreach b
, $(boards-per-dir
), \
1510 printf
" %-24s - Build for %s\\n" $*/$(b
) $(subst _defconfig
,,$(b
));) \
1514 # Documentation targets
1515 # ---------------------------------------------------------------------------
1516 DOC_TARGETS
:= xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1517 linkcheckdocs dochelp refcheckdocs
1518 PHONY
+= $(DOC_TARGETS
)
1519 $(DOC_TARGETS
): scripts_basic FORCE
1520 $(Q
)$(MAKE
) $(build
)=Documentation
$@
1523 # ---------------------------------------------------------------------------
1525 PHONY
+= scripts_gdb
1526 scripts_gdb
: prepare
1527 $(Q
)$(MAKE
) $(build
)=scripts
/gdb
1528 $(Q
)ln
-fsn
$(abspath
$(srctree
)/scripts
/gdb
/vmlinux-gdb.py
)
1530 ifdef CONFIG_GDB_SCRIPTS
1534 else # KBUILD_EXTMOD
1537 # External module support.
1538 # When building external modules the kernel used as basis is considered
1539 # read-only, and no consistency checks are made and the make
1540 # system is not used on the basis kernel. If updates are required
1541 # in the basis kernel ordinary make commands (without M=...) must
1544 # The following are the only valid targets when building external
1546 # make M=dir clean Delete all automatically generated files
1547 # make M=dir modules Make all modules in specified dir
1548 # make M=dir Same as 'make M=dir modules'
1549 # make M=dir modules_install
1550 # Install the modules built in the module directory
1551 # Assumes install directory is already created
1553 # We are always building modules
1556 PHONY
+= $(objtree
)/Module.symvers
1557 $(objtree
)/Module.symvers
:
1558 @
test -e
$(objtree
)/Module.symvers ||
( \
1560 echo
" WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1561 echo
" is missing; modules will have no dependencies and modversions."; \
1564 module-dirs
:= $(addprefix _module_
,$(KBUILD_EXTMOD
))
1565 PHONY
+= $(module-dirs
) modules
1566 $(module-dirs
): prepare
$(objtree
)/Module.symvers
1567 $(Q
)$(MAKE
) $(build
)=$(patsubst _module_
%,%,$@
)
1569 modules
: $(module-dirs
)
1570 @
$(kecho
) ' Building modules, stage 2.';
1571 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1573 PHONY
+= modules_install
1574 modules_install
: _emodinst_ _emodinst_post
1576 install-dir
:= $(if
$(INSTALL_MOD_DIR
),$(INSTALL_MOD_DIR
),extra
)
1579 $(Q
)mkdir
-p
$(MODLIB
)/$(install-dir
)
1580 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1582 PHONY
+= _emodinst_post
1583 _emodinst_post
: _emodinst_
1586 clean-dirs
:= $(addprefix _clean_
,$(KBUILD_EXTMOD
))
1588 PHONY
+= $(clean-dirs
) clean
1590 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1592 clean: rm-dirs
:= $(MODVERDIR
)
1593 clean: rm-files
:= $(KBUILD_EXTMOD
)/Module.symvers
1597 @echo
' Building external modules.'
1598 @echo
' Syntax: make -C path/to/kernel/src M=$$PWD target'
1600 @echo
' modules - default target, build the module(s)'
1601 @echo
' modules_install - install the module'
1602 @echo
' clean - remove generated files in module directory only'
1608 endif # KBUILD_EXTMOD
1610 clean: $(clean-dirs
)
1613 @find
$(if
$(KBUILD_EXTMOD
), $(KBUILD_EXTMOD
), .
) $(RCS_FIND_IGNORE
) \
1614 \
( -name
'*.[aios]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
1616 -o
-name
'*.dtb' -o
-name
'*.dtb.S' -o
-name
'*.dt.yaml' \
1617 -o
-name
'*.dwo' -o
-name
'*.lst' \
1619 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
1620 -o
-name
'*.lex.c' -o
-name
'*.tab.[ch]' \
1621 -o
-name
'*.asn1.[ch]' \
1622 -o
-name
'*.symtypes' -o
-name
'modules.order' \
1623 -o
-name modules.builtin
-o
-name
'.tmp_*.o.*' \
1624 -o
-name
'*.c.[012]*.*' \
1626 -o
-name
'*.gcno' \
) -type f
-print | xargs
rm -f
1628 # Generate tags for editors
1629 # ---------------------------------------------------------------------------
1630 quiet_cmd_tags
= GEN
$@
1631 cmd_tags
= $(CONFIG_SHELL
) $(srctree
)/scripts
/tags.sh
$@
1633 tags TAGS cscope gtags
: FORCE
1636 # Scripts to check various things for consistency
1637 # ---------------------------------------------------------------------------
1639 PHONY
+= includecheck versioncheck coccicheck namespacecheck export_report
1642 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1643 -name
'*.[hcS]' -type f
-print |
sort \
1644 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkincludes.pl
1647 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1648 -name
'*.[hcS]' -type f
-print |
sort \
1649 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkversion.pl
1652 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/$@
1655 $(PERL
) $(srctree
)/scripts
/namespace.pl
1658 $(PERL
) $(srctree
)/scripts
/export_report.pl
1660 PHONY
+= checkstack kernelrelease kernelversion image_name
1662 # UML needs a little special treatment here. It wants to use the host
1663 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1664 # else wants $(ARCH), including people doing cross-builds, which means
1665 # that $(SUBARCH) doesn't work here.
1667 CHECKSTACK_ARCH
:= $(SUBARCH
)
1669 CHECKSTACK_ARCH
:= $(ARCH
)
1672 $(OBJDUMP
) -d vmlinux
$$(find .
-name
'*.ko') | \
1673 $(PERL
) $(src
)/scripts
/checkstack.pl
$(CHECKSTACK_ARCH
)
1676 @echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1679 @echo
$(KERNELVERSION
)
1682 @echo
$(KBUILD_IMAGE
)
1684 # Clear a bunch of variables before executing the submake
1686 ifeq ($(quiet
),silent_
)
1691 $(Q
)mkdir
-p
$(objtree
)/tools
1692 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(src
)/tools
/
1695 $(Q
)mkdir
-p
$(objtree
)/tools
1696 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(src
)/tools
/ $*
1699 # ---------------------------------------------------------------------------
1700 # Single targets are compatible with:
1701 # - build with mixed source and output
1702 # - build with separate output dir 'make O=...'
1703 # - external modules
1705 # target-dir => where to store outputfile
1706 # build-dir => directory in kernel source tree to use
1708 build-target
= $(if
$(KBUILD_EXTMOD
), $(KBUILD_EXTMOD
)/)$@
1709 build-dir
= $(patsubst %/,%,$(dir $(build-target
)))
1712 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(build-target
)
1714 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(build-target
)
1715 %.lst
: prepare FORCE
1716 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(build-target
)
1718 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(build-target
)
1720 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(build-target
)
1721 %.symtypes
: prepare FORCE
1722 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(build-target
)
1724 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1730 # Make sure the latest headers are built for Documentation
1731 Documentation
/ samples
/: headers_install
1733 $(Q
)$(MAKE
) KBUILD_MODULES
=1 $(build
)=$(build-dir
)
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
) \
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 saved command lines for existing targets
1755 existing-targets
:= $(wildcard $(sort $(targets
)))
1757 -include $(foreach f
,$(existing-targets
),$(dir $(f
)).
$(notdir $(f
)).cmd
)
1759 endif # ifeq ($(config-targets),1)
1760 endif # ifeq ($(mixed-targets),1)
1761 endif # sub-make-done
1766 # Declare the contents of the PHONY variable as phony. We keep that
1767 # information in a variable so we can use it in if_changed and friends.