8 # To see a list of typical targets execute "make help"
9 # More info can be located in ./README
10 # Comments in this file are targeted only to the developer, do not
11 # expect to learn how to build the kernel reading this file.
13 # o Do not use make's built-in rules and variables
14 # (this increases performance and avoids hard-to-debug behaviour);
15 # o Look for make include files relative to root of kernel src
16 MAKEFLAGS
+= -rR
--include-dir
=$(CURDIR
)
18 # Avoid funny character set dependencies
22 export LC_COLLATE LC_NUMERIC
24 # Avoid interference with shell env settings
27 # We are using a recursive build, so we need to do a little thinking
28 # to get the ordering right.
30 # Most importantly: sub-Makefiles should only ever modify files in
31 # their own directory. If in some directory we have a dependency on
32 # a file in another dir (which doesn't happen often, but it's often
33 # unavoidable when linking the built-in.o targets which finally
34 # turn into vmlinux), we will call a sub make in that other dir, and
35 # after that we are sure that everything which is in that other dir
38 # The only cases where we need to modify files which have global
39 # effects are thus separated out and done before the recursive
40 # descending is started. They are now explicitly listed as the
44 # ---------------------------------------------------------------------------
46 # Normally, we echo the whole command before executing it. By making
47 # that echo $($(quiet)$(cmd)), we now have the possibility to set
48 # $(quiet) to choose other forms of output instead, e.g.
50 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
51 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
53 # If $(quiet) is empty, the whole command will be printed.
54 # If it is set to "quiet_", only the short version will be printed.
55 # If it is set to "silent_", nothing will be printed at all, since
56 # the variable $(silent_cmd_cc_o_c) doesn't exist.
58 # A simple variant is to prefix commands with $(Q) - that's useful
59 # for commands that shall be hidden in non-verbose mode.
63 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
64 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
66 # To put more focus on warnings, be less verbose as default
67 # Use 'make V=1' to see the full commands
69 ifeq ("$(origin V)", "command line")
76 ifeq ($(KBUILD_VERBOSE
),1)
84 # If the user is running make -s (silent mode), suppress echoing of
87 ifneq ($(filter 4.
%,$(MAKE_VERSION
)),) # make-4
88 ifneq ($(filter %s
,$(firstword x
$(MAKEFLAGS
))),)
92 ifneq ($(filter s
% -s
%,$(MAKEFLAGS
)),)
97 export quiet Q KBUILD_VERBOSE
99 # kbuild supports saving output files in a separate directory.
100 # To locate output files in a separate directory two syntaxes are supported.
101 # In both cases the working directory must be the root of the kernel src.
103 # Use "make O=dir/to/store/output/files/"
105 # 2) Set KBUILD_OUTPUT
106 # Set the environment variable KBUILD_OUTPUT to point to the directory
107 # where the output files shall be placed.
108 # export KBUILD_OUTPUT=dir/to/store/output/files/
111 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
114 # KBUILD_SRC is set on invocation of make in OBJ directory
115 # KBUILD_SRC is not intended to be used by the regular user (for now)
116 ifeq ($(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 # That's our default target when none is given on the command line
128 # Cancel implicit rules on top Makefile
129 $(CURDIR
)/Makefile Makefile
: ;
131 ifneq ($(words $(subst :, ,$(CURDIR
))), 1)
132 $(error main directory cannot contain spaces nor colons
)
135 ifneq ($(KBUILD_OUTPUT
),)
136 # Invoke a second make in the output directory, passing relevant variables
137 # check that the output directory actually exists
138 saved-output
:= $(KBUILD_OUTPUT
)
139 KBUILD_OUTPUT
:= $(shell mkdir
-p
$(KBUILD_OUTPUT
) && cd
$(KBUILD_OUTPUT
) \
141 $(if
$(KBUILD_OUTPUT
),, \
142 $(error failed to create output directory
"$(saved-output)"))
144 PHONY
+= $(MAKECMDGOALS
) sub-make
146 $(filter-out _all sub-make
$(CURDIR
)/Makefile
, $(MAKECMDGOALS
)) _all
: sub-make
150 $(Q
)$(MAKE
) -C
$(KBUILD_OUTPUT
) KBUILD_SRC
=$(CURDIR
) \
151 -f
$(CURDIR
)/Makefile
$(filter-out _all sub-make
,$(MAKECMDGOALS
))
153 # Leave processing to above invocation of make
155 endif # ifneq ($(KBUILD_OUTPUT),)
156 endif # ifeq ($(KBUILD_SRC),)
158 # We process the rest of the Makefile if this is the final invocation of make
159 ifeq ($(skip-makefile
),)
161 # Do not print "Entering directory ...",
162 # but we want to display it when entering to the output directory
163 # so that IDEs/editors are able to understand relative filenames.
164 MAKEFLAGS
+= --no-print-directory
166 # Call a source code checker (by default, "sparse") as part of the
169 # Use 'make C=1' to enable checking of only re-compiled files.
170 # Use 'make C=2' to enable checking of *all* source files, regardless
171 # of whether they are re-compiled or not.
173 # See the file "Documentation/sparse.txt" for more details, including
174 # where to get the "sparse" utility.
176 ifeq ("$(origin C)", "command line")
177 KBUILD_CHECKSRC
= $(C
)
179 ifndef KBUILD_CHECKSRC
183 # Use make M=dir to specify directory of external module to build
184 # Old syntax make ... SUBDIRS=$PWD is still supported
185 # Setting the environment variable KBUILD_EXTMOD take precedence
187 KBUILD_EXTMOD ?
= $(SUBDIRS
)
190 ifeq ("$(origin M)", "command line")
191 KBUILD_EXTMOD
:= $(M
)
194 # If building an external module we do not care about the all: rule
195 # but instead _all depend on modules
197 ifeq ($(KBUILD_EXTMOD
),)
203 ifeq ($(KBUILD_SRC
),)
204 # building in the source tree
207 ifeq ($(KBUILD_SRC
)/,$(dir $(CURDIR
)))
208 # building in a subdirectory of the source tree
211 srctree
:= $(KBUILD_SRC
)
218 VPATH
:= $(srctree
)$(if
$(KBUILD_EXTMOD
),:$(KBUILD_EXTMOD
))
220 export srctree objtree VPATH
222 # SUBARCH tells the usermode build what the underlying arch is. That is set
223 # first, and if a usermode build is happening, the "ARCH=um" on the command
224 # line overrides the setting of ARCH below. If a native build is happening,
225 # then ARCH is assigned, getting whatever value it gets normally, and
226 # SUBARCH is subsequently ignored.
228 SUBARCH
:= $(shell uname
-m | sed
-e s
/i
.86/x86
/ -e s
/x86_64
/x86
/ \
229 -e s
/sun4u
/sparc64
/ \
230 -e s
/arm.
*/arm
/ -e s
/sa110
/arm
/ \
231 -e s
/s390x
/s390
/ -e s
/parisc64
/parisc
/ \
232 -e s
/ppc.
*/powerpc
/ -e s
/mips.
*/mips
/ \
233 -e s
/sh
[234].
*/sh
/ -e s
/aarch64.
*/arm64
/ )
235 # Cross compiling and selecting different set of gcc/bin-utils
236 # ---------------------------------------------------------------------------
238 # When performing cross compilation for other architectures ARCH shall be set
239 # to the target architecture. (See arch/* for the possibilities).
240 # ARCH can be set during invocation of make:
242 # Another way is to have ARCH set in the environment.
243 # The default ARCH is the host where make is executed.
245 # CROSS_COMPILE specify the prefix used for all executables used
246 # during compilation. Only gcc and related bin-utils executables
247 # are prefixed with $(CROSS_COMPILE).
248 # CROSS_COMPILE can be set on the command line
249 # make CROSS_COMPILE=ia64-linux-
250 # Alternatively CROSS_COMPILE can be set in the environment.
251 # A third alternative is to store a setting in .config so that plain
252 # "make" in the configured kernel build directory always uses that.
253 # Default value for CROSS_COMPILE is not to prefix executables
254 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
256 CROSS_COMPILE ?
= $(CONFIG_CROSS_COMPILE
:"%"=%)
258 # Architecture as present in compile.h
259 UTS_MACHINE
:= $(ARCH
)
262 # Additional ARCH settings for x86
266 ifeq ($(ARCH
),x86_64
)
270 # Additional ARCH settings for sparc
271 ifeq ($(ARCH
),sparc32
)
274 ifeq ($(ARCH
),sparc64
)
278 # Additional ARCH settings for sh
283 # Additional ARCH settings for tile
284 ifeq ($(ARCH
),tilepro
)
287 ifeq ($(ARCH
),tilegx
)
291 # Where to locate arch specific headers
292 hdr-arch
:= $(SRCARCH
)
294 KCONFIG_CONFIG ?
= .config
295 export KCONFIG_CONFIG
297 # SHELL used by kbuild
298 CONFIG_SHELL
:= $(shell if
[ -x
"$$BASH" ]; then echo
$$BASH; \
299 else if
[ -x
/bin
/bash
]; then echo
/bin
/bash
; \
300 else echo sh
; fi
; fi
)
304 HOSTCFLAGS
= -Wall
-Wmissing-prototypes
-Wstrict-prototypes
-O2
-fomit-frame-pointer
-std
=gnu89
307 ifeq ($(shell $(HOSTCC
) -v
2>&1 | grep
-c
"clang version"), 1)
308 HOSTCFLAGS
+= -Wno-unused-value
-Wno-unused-parameter \
309 -Wno-missing-field-initializers
-fno-delete-null-pointer-checks
312 # Decide whether to build built-in, modular, or both.
313 # Normally, just do built-in.
318 # If we have only "make modules", don't compile built-in objects.
319 # When we're building modules with modversions, we need to consider
320 # the built-in objects during the descend as well, in order to
321 # make sure the checksums are up to date before we record them.
323 ifeq ($(MAKECMDGOALS
),modules
)
324 KBUILD_BUILTIN
:= $(if
$(CONFIG_MODVERSIONS
),1)
327 # If we have "make <whatever> modules", compile modules
328 # in addition to whatever we do anyway.
329 # Just "make" or "make all" shall build modules as well
331 ifneq ($(filter all _all modules
,$(MAKECMDGOALS
)),)
335 ifeq ($(MAKECMDGOALS
),)
339 export KBUILD_MODULES KBUILD_BUILTIN
340 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
342 # We need some generic definitions (do not try to remake the file).
343 scripts
/Kbuild.
include: ;
344 include scripts
/Kbuild.
include
346 # Make variables (CC, etc...)
347 AS
= $(CROSS_COMPILE
)as
348 LD
= $(CROSS_COMPILE
)ld
349 CC
= $(CROSS_COMPILE
)gcc
351 AR
= $(CROSS_COMPILE
)ar
352 NM
= $(CROSS_COMPILE
)nm
353 STRIP
= $(CROSS_COMPILE
)strip
354 OBJCOPY
= $(CROSS_COMPILE
)objcopy
355 OBJDUMP
= $(CROSS_COMPILE
)objdump
357 GENKSYMS
= scripts
/genksyms
/genksyms
358 INSTALLKERNEL
:= installkernel
359 DEPMOD
= /sbin
/depmod
364 CHECKFLAGS
:= -D__linux__
-Dlinux
-D__STDC__
-Dunix
-D__unix__ \
365 -Wbitwise
-Wno-return-void
$(CF
)
373 CFLAGS_GCOV
= -fprofile-arcs
-ftest-coverage
-fno-tree-loop-im
-Wno-maybe-uninitialized
374 CFLAGS_KCOV
:= $(call cc-option
,-fsanitize-coverage
=trace-pc
,)
376 # Prefer linux-backports-modules
377 ifneq ($(KBUILD_SRC
),)
378 ifneq ($(shell if
test -e
$(KBUILD_OUTPUT
)/ubuntu-build
; then echo yes
; fi
),yes
)
379 UBUNTUINCLUDE
:= -I
/usr
/src
/linux-headers-lbm-
$(KERNELRELEASE
)
383 # Use USERINCLUDE when you must reference the UAPI directories only.
385 -I
$(srctree
)/arch
/$(hdr-arch
)/include/uapi \
386 -I
$(objtree
)/arch
/$(hdr-arch
)/include/generated
/uapi \
387 -I
$(srctree
)/include/uapi \
388 -I
$(objtree
)/include/generated
/uapi \
389 -include $(srctree
)/include/linux
/kconfig.h
391 # Use LINUXINCLUDE when you must reference the include/ directory.
392 # Needed to be compatible with the O= option
395 -I
$(srctree
)/arch
/$(hdr-arch
)/include \
396 -I
$(objtree
)/arch
/$(hdr-arch
)/include/generated
/uapi \
397 -I
$(objtree
)/arch
/$(hdr-arch
)/include/generated \
398 $(if
$(KBUILD_SRC
), -I
$(srctree
)/include) \
401 LINUXINCLUDE
+= $(filter-out $(LINUXINCLUDE
),$(USERINCLUDE
))
403 # UBUNTU: Include our third party driver stuff too
404 LINUXINCLUDE
+= -Iubuntu
/include $(if
$(KBUILD_SRC
),-I
$(srctree
)/ubuntu
/include)
406 KBUILD_CPPFLAGS
:= -D__KERNEL__
408 KBUILD_CFLAGS
:= -Wall
-Wundef
-Wstrict-prototypes
-Wno-trigraphs \
409 -fno-strict-aliasing
-fno-common \
410 -Werror-implicit-function-declaration \
411 -Wno-format-security \
412 -std
=gnu89
$(call cc-option
,-fno-PIE
)
415 KBUILD_AFLAGS_KERNEL
:=
416 KBUILD_CFLAGS_KERNEL
:=
417 KBUILD_AFLAGS
:= -D__ASSEMBLY__
$(call cc-option
,-fno-PIE
)
418 KBUILD_AFLAGS_MODULE
:= -DMODULE
419 KBUILD_CFLAGS_MODULE
:= -DMODULE
420 KBUILD_LDFLAGS_MODULE
:= -T
$(srctree
)/scripts
/module-common.lds
422 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
423 KERNELRELEASE
= $(shell cat
include/config
/kernel.release
2> /dev
/null
)
424 KERNELVERSION
= $(VERSION
)$(if
$(PATCHLEVEL
),.
$(PATCHLEVEL
)$(if
$(SUBLEVEL
),.
$(SUBLEVEL
)))$(EXTRAVERSION
)
426 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
427 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
428 export CPP AR NM STRIP OBJCOPY OBJDUMP
429 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
430 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
432 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
433 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
434 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
435 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
436 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
437 export KBUILD_ARFLAGS
439 # When compiling out-of-tree modules, put MODVERDIR in the module
440 # tree rather than in the kernel tree. The kernel tree might
442 export MODVERDIR
:= $(if
$(KBUILD_EXTMOD
),$(firstword $(KBUILD_EXTMOD
))/).tmp_versions
444 # Files to ignore in find ... statements
446 export RCS_FIND_IGNORE
:= \
( -name SCCS
-o
-name BitKeeper
-o
-name .svn
-o \
447 -name CVS
-o
-name .
pc -o
-name .hg
-o
-name .git \
) \
449 export RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn \
450 --exclude CVS
--exclude .
pc --exclude .hg
--exclude .git
452 # ===========================================================================
453 # Rules shared between *config targets and build targets
455 # Basic helpers built in scripts/
456 PHONY
+= scripts_basic
458 $(Q
)$(MAKE
) $(build
)=scripts
/basic
459 $(Q
)rm -f .tmp_quiet_recordmcount
461 # To avoid any implicit rule to kick in, define an empty command.
462 scripts
/basic
/%: scripts_basic
;
464 PHONY
+= outputmakefile
465 # outputmakefile generates a Makefile in the output directory, if using a
466 # separate output directory. This allows convenient use of make in the
469 ifneq ($(KBUILD_SRC
),)
470 $(Q
)ln
-fsn
$(srctree
) source
471 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/mkmakefile \
472 $(srctree
) $(objtree
) $(VERSION
) $(PATCHLEVEL
)
475 # Support for using generic headers in asm-generic
478 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.asm-generic \
479 src
=asm obj
=arch
/$(SRCARCH
)/include/generated
/asm
480 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.asm-generic \
481 src
=uapi
/asm obj
=arch
/$(SRCARCH
)/include/generated
/uapi
/asm
483 # To make sure we do not include .config for any of the *config targets
484 # catch them early, and hand them over to scripts/kconfig/Makefile
485 # It is allowed to specify more targets when calling make, including
486 # mixing *config targets and build targets.
487 # For example 'make oldconfig all'.
488 # Detect when mixed targets is specified, and make a second invocation
489 # of make so .config is not included in this case either (for *config).
491 version_h
:= include/generated
/uapi
/linux
/version.h
492 old_version_h
:= include/linux
/version.h
494 no-dot-config-targets
:= clean mrproper
distclean \
495 cscope gtags TAGS
tags help
% %docs
check% coccicheck \
496 $(version_h
) headers_
% archheaders archscripts \
497 kernelversion
%src-pkg
503 ifneq ($(filter $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
504 ifeq ($(filter-out $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
509 ifeq ($(KBUILD_EXTMOD
),)
510 ifneq ($(filter config
%config
,$(MAKECMDGOALS
)),)
512 ifneq ($(words $(MAKECMDGOALS
)),1)
517 # install and module_install need also be processed one by one
518 ifneq ($(filter install,$(MAKECMDGOALS
)),)
519 ifneq ($(filter modules_install
,$(MAKECMDGOALS
)),)
524 ifeq ($(mixed-targets
),1)
525 # ===========================================================================
526 # We're called with mixed targets (*config and build targets).
527 # Handle them one by one.
529 PHONY
+= $(MAKECMDGOALS
) __build_one_by_one
531 $(filter-out __build_one_by_one
, $(MAKECMDGOALS
)): __build_one_by_one
536 for i in
$(MAKECMDGOALS
); do \
537 $(MAKE
) -f
$(srctree
)/Makefile
$$i; \
541 ifeq ($(config-targets
),1)
542 # ===========================================================================
543 # *config targets only - make sure prerequisites are updated, and descend
544 # in scripts/kconfig to make the *config target
546 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
547 # KBUILD_DEFCONFIG may point out an alternative default configuration
548 # used for 'make defconfig'
549 include arch
/$(SRCARCH
)/Makefile
550 export KBUILD_DEFCONFIG KBUILD_KCONFIG
552 config
: scripts_basic outputmakefile FORCE
553 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
555 %config
: scripts_basic outputmakefile FORCE
556 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
559 # ===========================================================================
560 # Build targets only - this includes vmlinux, arch specific targets, clean
561 # targets and others. In general all targets except *config targets.
563 ifeq ($(KBUILD_EXTMOD
),)
564 # Additional helpers built in scripts/
565 # Carefully list dependencies so we do not try to build scripts twice
568 scripts
: scripts_basic
include/config
/auto.conf
include/config
/tristate.conf \
569 asm-generic gcc-plugins
570 $(Q
)$(MAKE
) $(build
)=$(@
)
572 # Objects we will link into vmlinux / subdirs we need to visit
574 drivers-y
:= drivers
/ sound
/ firmware
/ ubuntu
/
579 endif # KBUILD_EXTMOD
581 ifeq ($(dot-config
),1)
583 -include include/config
/auto.conf
585 ifeq ($(KBUILD_EXTMOD
),)
586 # Read in dependencies to all Kconfig* files, make sure to run
587 # oldconfig if changes are detected.
588 -include include/config
/auto.conf.cmd
590 # To avoid any implicit rule to kick in, define an empty command
591 $(KCONFIG_CONFIG
) include/config
/auto.conf.cmd
: ;
593 # If .config is newer than include/config/auto.conf, someone tinkered
594 # with it and forgot to run make oldconfig.
595 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
596 # we execute the config step to be sure to catch updated Kconfig files
597 include/config
/%.conf
: $(KCONFIG_CONFIG
) include/config
/auto.conf.cmd
598 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile silentoldconfig
600 # external modules needs include/generated/autoconf.h and include/config/auto.conf
601 # but do not care if they are up-to-date. Use auto.conf to trigger the test
602 PHONY
+= include/config
/auto.conf
604 include/config
/auto.conf
:
605 $(Q
)test -e
include/generated
/autoconf.h
-a
-e
$@ ||
( \
607 echo
>&2 " ERROR: Kernel configuration is invalid."; \
608 echo
>&2 " include/generated/autoconf.h or $@ are missing.";\
609 echo
>&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
613 endif # KBUILD_EXTMOD
616 # Dummy target needed, because used as prerequisite
617 include/config
/auto.conf
: ;
618 endif # $(dot-config)
620 # For the kernel to actually contain only the needed exported symbols,
621 # we have to build modules as well to determine what those symbols are.
622 # (this can be evaluated only once include/config/auto.conf has been included)
623 ifdef CONFIG_TRIM_UNUSED_KSYMS
627 # The all: target is the default when no target is given on the
629 # This allow a user to issue only 'make' to build a kernel including modules
630 # Defaults to vmlinux, but the arch makefile usually adds further targets
633 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
634 # values of the respective KBUILD_* variables
638 include arch
/$(SRCARCH
)/Makefile
640 KBUILD_CFLAGS
+= $(call cc-option
,-fno-delete-null-pointer-checks
,)
641 KBUILD_CFLAGS
+= $(call cc-disable-warning
,frame-address
,)
643 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
644 KBUILD_CFLAGS
+= $(call cc-option
,-ffunction-sections
,)
645 KBUILD_CFLAGS
+= $(call cc-option
,-fdata-sections
,)
648 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
649 KBUILD_CFLAGS
+= -Os
$(call cc-disable-warning
,maybe-uninitialized
,)
651 ifdef CONFIG_PROFILE_ALL_BRANCHES
652 KBUILD_CFLAGS
+= -O2
$(call cc-disable-warning
,maybe-uninitialized
,)
658 KBUILD_CFLAGS
+= $(call cc-ifversion
, -lt
, 0409, \
659 $(call cc-disable-warning
,maybe-uninitialized
,))
661 # Tell gcc to never replace conditional load with a non-conditional one
662 KBUILD_CFLAGS
+= $(call cc-option
,--param
=allow-store-data-races
=0)
664 include scripts
/Makefile.gcc-plugins
666 ifdef CONFIG_READABLE_ASM
667 # Disable optimizations that make assembler listings hard to read.
668 # reorder blocks reorders the control in the function
669 # ipa clone creates specialized cloned functions
670 # partial inlining inlines only parts of functions
671 KBUILD_CFLAGS
+= $(call cc-option
,-fno-reorder-blocks
,) \
672 $(call cc-option
,-fno-ipa-cp-clone
,) \
673 $(call cc-option
,-fno-partial-inlining
)
676 ifneq ($(CONFIG_FRAME_WARN
),0)
677 KBUILD_CFLAGS
+= $(call cc-option
,-Wframe-larger-than
=${CONFIG_FRAME_WARN})
680 # This selects the stack protector compiler flag. Testing it is delayed
681 # until after .config has been reprocessed, in the prepare-compiler-check
683 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
684 stackp-flag
:= -fstack-protector
685 stackp-name
:= REGULAR
687 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
688 stackp-flag
:= -fstack-protector-strong
689 stackp-name
:= STRONG
691 # Force off for distro compilers that enable stack protector by default.
692 stackp-flag
:= $(call cc-option
, -fno-stack-protector
)
695 # Find arch-specific stack protector compiler sanity-checking script.
696 ifdef CONFIG_CC_STACKPROTECTOR
697 stackp-path
:= $(srctree
)/scripts
/gcc-
$(SRCARCH
)_
$(BITS
)-has-stack-protector.sh
698 stackp-check
:= $(wildcard $(stackp-path
))
700 KBUILD_CFLAGS
+= $(stackp-flag
)
702 ifeq ($(cc-name
),clang
)
703 KBUILD_CPPFLAGS
+= $(call cc-option
,-Qunused-arguments
,)
704 KBUILD_CPPFLAGS
+= $(call cc-option
,-Wno-unknown-warning-option
,)
705 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-variable
)
706 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-invalid-specifier
)
707 KBUILD_CFLAGS
+= $(call cc-disable-warning
, gnu
)
708 # Quiet clang warning: comparison of unsigned expression < 0 is always false
709 KBUILD_CFLAGS
+= $(call cc-disable-warning
, tautological-compare
)
710 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
711 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
712 # See modpost pattern 2
713 KBUILD_CFLAGS
+= $(call cc-option
, -mno-global-merge
,)
714 KBUILD_CFLAGS
+= $(call cc-option
, -fcatch-undefined-behavior
)
717 # These warnings generated too much noise in a regular build.
718 # Use make W=1 to enable them (see scripts/Makefile.build)
719 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-but-set-variable
)
720 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-const-variable
)
723 ifdef CONFIG_FRAME_POINTER
724 KBUILD_CFLAGS
+= -fno-omit-frame-pointer
-fno-optimize-sibling-calls
726 # Some targets (ARM with Thumb2, for example), can't be built with frame
727 # pointers. For those, we don't have FUNCTION_TRACER automatically
728 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
729 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
730 # -fomit-frame-pointer with FUNCTION_TRACER.
731 ifndef CONFIG_FUNCTION_TRACER
732 KBUILD_CFLAGS
+= -fomit-frame-pointer
736 KBUILD_CFLAGS
+= $(call cc-option
, -fno-var-tracking-assignments
)
738 ifdef CONFIG_DEBUG_INFO
739 ifdef CONFIG_DEBUG_INFO_SPLIT
740 KBUILD_CFLAGS
+= $(call cc-option
, -gsplit-dwarf
, -g
)
744 KBUILD_AFLAGS
+= -Wa
,-gdwarf-2
746 ifdef CONFIG_DEBUG_INFO_DWARF4
747 KBUILD_CFLAGS
+= $(call cc-option
, -gdwarf-4
,)
750 ifdef CONFIG_DEBUG_INFO_REDUCED
751 KBUILD_CFLAGS
+= $(call cc-option
, -femit-struct-debug-baseonly
) \
752 $(call cc-option
,-fno-var-tracking
)
755 ifdef CONFIG_FUNCTION_TRACER
756 ifndef CC_FLAGS_FTRACE
757 CC_FLAGS_FTRACE
:= -pg
759 export CC_FLAGS_FTRACE
760 ifdef CONFIG_HAVE_FENTRY
761 CC_USING_FENTRY
:= $(call cc-option
, -mfentry
-DCC_USING_FENTRY
)
763 KBUILD_CFLAGS
+= $(CC_FLAGS_FTRACE
) $(CC_USING_FENTRY
)
764 KBUILD_AFLAGS
+= $(CC_USING_FENTRY
)
765 ifdef CONFIG_DYNAMIC_FTRACE
766 ifdef CONFIG_HAVE_C_RECORDMCOUNT
767 BUILD_C_RECORDMCOUNT
:= y
768 export BUILD_C_RECORDMCOUNT
773 # We trigger additional mismatches with less inlining
774 ifdef CONFIG_DEBUG_SECTION_MISMATCH
775 KBUILD_CFLAGS
+= $(call cc-option
, -fno-inline-functions-called-once
)
778 # arch Makefile may override CC so keep this after arch Makefile is included
779 NOSTDINC_FLAGS
+= -nostdinc
-isystem
$(shell $(CC
) -print-file-name
=include)
780 CHECKFLAGS
+= $(NOSTDINC_FLAGS
)
782 # warn about C99 declaration after statement
783 KBUILD_CFLAGS
+= $(call cc-option
,-Wdeclaration-after-statement
,)
785 # disable pointer signed / unsigned warnings in gcc 4.0
786 KBUILD_CFLAGS
+= $(call cc-disable-warning
, pointer-sign
)
788 # disable invalid "can't wrap" optimizations for signed / pointers
789 KBUILD_CFLAGS
+= $(call cc-option
,-fno-strict-overflow
)
791 # conserve stack if available
792 KBUILD_CFLAGS
+= $(call cc-option
,-fconserve-stack
)
794 # disallow errors like 'EXPORT_GPL(foo);' with missing header
795 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=implicit-int
)
797 # require functions to have arguments in prototypes, not empty 'int foo()'
798 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=strict-prototypes
)
800 # Prohibit date/time macros, which would make the build non-deterministic
801 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=date-time
)
803 # enforce correct pointer usage
804 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=incompatible-pointer-types
)
806 # use the deterministic mode of AR if available
807 KBUILD_ARFLAGS
:= $(call ar-option
,D
)
809 # check for 'asm goto'
810 ifeq ($(shell $(CONFIG_SHELL
) $(srctree
)/scripts
/gcc-goto.sh
$(CC
) $(KBUILD_CFLAGS
)), y
)
811 KBUILD_CFLAGS
+= -DCC_HAVE_ASM_GOTO
812 KBUILD_AFLAGS
+= -DCC_HAVE_ASM_GOTO
815 include scripts
/Makefile.kasan
816 include scripts
/Makefile.extrawarn
817 include scripts
/Makefile.ubsan
819 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
821 KBUILD_CPPFLAGS
+= $(ARCH_CPPFLAGS
) $(KCPPFLAGS
)
822 KBUILD_AFLAGS
+= $(ARCH_AFLAGS
) $(KAFLAGS
)
823 KBUILD_CFLAGS
+= $(ARCH_CFLAGS
) $(KCFLAGS
)
825 # Use --build-id when available.
826 LDFLAGS_BUILD_ID
= $(patsubst -Wl
$(comma
)%,%,\
827 $(call cc-ldoption
, -Wl
$(comma
)--build-id
,))
828 KBUILD_LDFLAGS_MODULE
+= $(LDFLAGS_BUILD_ID
)
829 LDFLAGS_vmlinux
+= $(LDFLAGS_BUILD_ID
)
831 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
832 LDFLAGS_vmlinux
+= $(call ld-option
, --gc-sections
,)
835 ifeq ($(CONFIG_STRIP_ASM_SYMS
),y
)
836 LDFLAGS_vmlinux
+= $(call ld-option
, -X
,)
839 # Default kernel image to build when no specific target is given.
840 # KBUILD_IMAGE may be overruled on the command line or
841 # set in the environment
842 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
844 export KBUILD_IMAGE ?
= vmlinux
847 # INSTALL_PATH specifies where to place the updated kernel and system map
848 # images. Default is /boot, but you can set it to other values
849 export INSTALL_PATH ?
= /boot
852 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
853 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
854 # an argument if needed. Otherwise it defaults to the kernel install path
856 export INSTALL_DTBS_PATH ?
= $(INSTALL_PATH
)/dtbs
/$(KERNELRELEASE
)
859 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
860 # relocations required by build roots. This is not defined in the
861 # makefile but the argument can be passed to make if needed.
864 MODLIB
= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
868 # INSTALL_MOD_STRIP, if defined, will cause modules to be
869 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
870 # the default option --strip-debug will be used. Otherwise,
871 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
873 ifdef INSTALL_MOD_STRIP
874 ifeq ($(INSTALL_MOD_STRIP
),1)
875 mod_strip_cmd
= $(STRIP
) --strip-debug
877 mod_strip_cmd
= $(STRIP
) $(INSTALL_MOD_STRIP
)
878 endif # INSTALL_MOD_STRIP=1
881 endif # INSTALL_MOD_STRIP
884 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
885 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
886 # or CONFIG_MODULE_COMPRESS_XZ.
888 mod_compress_cmd
= true
889 ifdef CONFIG_MODULE_COMPRESS
890 ifdef CONFIG_MODULE_COMPRESS_GZIP
891 mod_compress_cmd
= gzip
-n
-f
892 endif # CONFIG_MODULE_COMPRESS_GZIP
893 ifdef CONFIG_MODULE_COMPRESS_XZ
894 mod_compress_cmd
= xz
-f
895 endif # CONFIG_MODULE_COMPRESS_XZ
896 endif # CONFIG_MODULE_COMPRESS
897 export mod_compress_cmd
899 # Select initial ramdisk compression format, default is gzip(1).
900 # This shall be used by the dracut(8) tool while creating an initramfs image.
902 INITRD_COMPRESS-y
:= gzip
903 INITRD_COMPRESS-
$(CONFIG_RD_BZIP2
) := bzip2
904 INITRD_COMPRESS-
$(CONFIG_RD_LZMA
) := lzma
905 INITRD_COMPRESS-
$(CONFIG_RD_XZ
) := xz
906 INITRD_COMPRESS-
$(CONFIG_RD_LZO
) := lzo
907 INITRD_COMPRESS-
$(CONFIG_RD_LZ4
) := lz4
908 # do not export INITRD_COMPRESS, since we didn't actually
909 # choose a sane default compression above.
910 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
912 ifdef CONFIG_MODULE_SIG_ALL
913 $(eval
$(call config_filename
,MODULE_SIG_KEY
))
915 mod_sign_cmd
= scripts
/sign-file
$(CONFIG_MODULE_SIG_HASH
) $(MODULE_SIG_KEY_SRCPREFIX
)$(CONFIG_MODULE_SIG_KEY
) certs
/signing_key.x509
922 ifeq ($(KBUILD_EXTMOD
),)
923 core-y
+= kernel
/ certs
/ mm
/ fs
/ ipc
/ security
/ crypto
/ block
/
925 vmlinux-dirs
:= $(patsubst %/,%,$(filter %/, $(init-y
) $(init-m
) \
926 $(core-y
) $(core-m
) $(drivers-y
) $(drivers-m
) \
927 $(net-y
) $(net-m
) $(libs-y
) $(libs-m
) $(virt-y
)))
929 vmlinux-alldirs
:= $(sort $(vmlinux-dirs
) $(patsubst %/,%,$(filter %/, \
930 $(init-
) $(core-
) $(drivers-
) $(net-
) $(libs-
) $(virt-
))))
932 init-y
:= $(patsubst %/, %/built-in.o
, $(init-y
))
933 core-y
:= $(patsubst %/, %/built-in.o
, $(core-y
))
934 drivers-y
:= $(patsubst %/, %/built-in.o
, $(drivers-y
))
935 net-y
:= $(patsubst %/, %/built-in.o
, $(net-y
))
936 libs-y1
:= $(patsubst %/, %/lib.a
, $(libs-y
))
937 libs-y2
:= $(patsubst %/, %/built-in.o
, $(libs-y
))
938 libs-y
:= $(libs-y1
) $(libs-y2
)
939 virt-y
:= $(patsubst %/, %/built-in.o
, $(virt-y
))
941 # Externally visible symbols (used by link-vmlinux.sh)
942 export KBUILD_VMLINUX_INIT
:= $(head-y
) $(init-y
)
943 export KBUILD_VMLINUX_MAIN
:= $(core-y
) $(libs-y
) $(drivers-y
) $(net-y
) $(virt-y
)
944 export KBUILD_LDS
:= arch
/$(SRCARCH
)/kernel
/vmlinux.lds
945 export LDFLAGS_vmlinux
946 # used by scripts/pacmage/Makefile
947 export KBUILD_ALLDIRS
:= $(sort $(filter-out arch
/%,$(vmlinux-alldirs
)) arch Documentation
include samples scripts tools
)
949 vmlinux-deps
:= $(KBUILD_LDS
) $(KBUILD_VMLINUX_INIT
) $(KBUILD_VMLINUX_MAIN
)
951 # Include targets which we want to execute sequentially if the rest of the
952 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
953 # evaluated more than once.
954 PHONY
+= vmlinux_prereq
955 vmlinux_prereq
: $(vmlinux-deps
) FORCE
956 ifdef CONFIG_HEADERS_CHECK
957 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile headers_check
959 ifdef CONFIG_GDB_SCRIPTS
960 $(Q
)ln
-fsn
`cd $(srctree) && /bin/pwd`/scripts
/gdb
/vmlinux-gdb.py
962 ifdef CONFIG_TRIM_UNUSED_KSYMS
963 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/adjust_autoksyms.sh \
964 "$(MAKE) -f $(srctree)/Makefile vmlinux"
967 # standalone target for easier testing
968 include/generated
/autoksyms.h
: FORCE
969 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/adjust_autoksyms.sh true
971 ARCH_POSTLINK
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/Makefile.postlink
)
973 # Final link of vmlinux with optional arch pass after final link
975 $(CONFIG_SHELL
) $< $(LD
) $(LDFLAGS
) $(LDFLAGS_vmlinux
) ; \
976 $(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) $@
, true
)
978 vmlinux
: scripts
/link-vmlinux.sh vmlinux_prereq
$(vmlinux-deps
) FORCE
979 +$(call if_changed
,link-vmlinux
)
981 # Build samples along the rest of the kernel
983 vmlinux-dirs
+= samples
986 # The actual objects are generated when descending,
987 # make sure no implicit rule kicks in
988 $(sort $(vmlinux-deps
)): $(vmlinux-dirs
) ;
990 # Handle descending into subdirectories listed in $(vmlinux-dirs)
991 # Preset locale variables to speed up the build process. Limit locale
992 # tweaks to this spot to avoid wrong language settings when running
993 # make menuconfig etc.
994 # Error messages still appears in the original language
996 PHONY
+= $(vmlinux-dirs
)
997 $(vmlinux-dirs
): prepare scripts
998 $(Q
)$(MAKE
) $(build
)=$@
1000 define filechk_kernel.release
1001 echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1004 # Store (new) KERNELRELEASE string in include/config/kernel.release
1005 include/config
/kernel.release
: include/config
/auto.conf FORCE
1006 $(call filechk
,kernel.release
)
1009 # Things we need to do before we recursively start building the kernel
1010 # or the modules are listed in "prepare".
1011 # A multi level approach is used. prepareN is processed before prepareN-1.
1012 # archprepare is used in arch Makefiles and when processed asm symlink,
1013 # version.h and scripts_basic is processed / created.
1015 # Listed in dependency order
1016 PHONY
+= prepare archprepare prepare0 prepare1 prepare2 prepare3
1018 # prepare3 is used to check if we are building in a separate output directory,
1020 # 1) Check that make has not been executed in the kernel src $(srctree)
1021 prepare3
: include/config
/kernel.release
1022 ifneq ($(KBUILD_SRC
),)
1023 @
$(kecho
) ' Using $(srctree) as source for kernel'
1024 $(Q
)if
[ -f
$(srctree
)/.config
-o
-d
$(srctree
)/include/config
]; then \
1025 echo
>&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1026 echo
>&2 " in the '$(srctree)' directory.";\
1031 # prepare2 creates a makefile if using a separate output directory.
1032 # From this point forward, .config has been reprocessed, so any rules
1033 # that need to depend on updated CONFIG_* values can be checked here.
1034 prepare2
: prepare3 prepare-compiler-check outputmakefile asm-generic
1036 prepare1
: prepare2
$(version_h
) include/generated
/utsrelease.h \
1037 include/config
/auto.conf
1040 archprepare
: archheaders archscripts prepare1 scripts_basic
1042 prepare0
: archprepare gcc-plugins
1043 $(Q
)$(MAKE
) $(build
)=.
1045 # All the preparing..
1046 prepare
: prepare0 prepare-objtool
1048 ifdef CONFIG_STACK_VALIDATION
1049 has_libelf
:= $(call try-run
,\
1050 echo
"int main() {}" |
$(HOSTCC
) -xc
-o
/dev
/null
-lelf
-,1,0)
1051 ifeq ($(has_libelf
),1)
1052 objtool_target
:= tools
/objtool FORCE
1054 $(warning
"Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
1055 SKIP_STACK_VALIDATION
:= 1
1056 export SKIP_STACK_VALIDATION
1060 PHONY
+= prepare-objtool
1061 prepare-objtool
: $(objtool_target
)
1063 # Check for CONFIG flags that require compiler support. Abort the build
1064 # after .config has been processed, but before the kernel build starts.
1066 # For security-sensitive CONFIG options, we don't want to fallback and/or
1067 # silently change which compiler flags will be used, since that leads to
1068 # producing kernels with different security feature characteristics
1069 # depending on the compiler used. (For example, "But I selected
1070 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1071 PHONY
+= prepare-compiler-check
1072 prepare-compiler-check
: FORCE
1073 # Make sure compiler supports requested stack protector flag.
1075 ifeq ($(call cc-option
, $(stackp-flag
)),)
1076 @echo Cannot use CONFIG_CC_STACKPROTECTOR_
$(stackp-name
): \
1077 $(stackp-flag
) not supported by compiler
>&2 && exit
1
1080 # Make sure compiler does not have buggy stack-protector support.
1082 ifneq ($(shell $(CONFIG_SHELL
) $(stackp-check
) $(CC
) $(KBUILD_CPPFLAGS
) $(biarch
)),y
)
1083 @echo Cannot use CONFIG_CC_STACKPROTECTOR_
$(stackp-name
): \
1084 $(stackp-flag
) available but compiler is broken
>&2 && exit
1
1089 # Generate some files
1090 # ---------------------------------------------------------------------------
1092 # KERNELRELEASE can change from a few different places, meaning version.h
1093 # needs to be updated, so this check is forced on all builds
1096 define filechk_utsrelease.h
1097 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
1098 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1101 (echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1104 define filechk_version.h
1105 (echo \
#define LINUX_VERSION_CODE $(shell \
1106 expr
$(VERSION
) \
* 65536 + 0$(PATCHLEVEL
) \
* 256 + 0$(SUBLEVEL
)); \
1107 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1110 $(version_h
): $(srctree
)/Makefile FORCE
1111 $(call filechk
,version.h
)
1112 $(Q
)rm -f
$(old_version_h
)
1114 include/generated
/utsrelease.h
: include/config
/kernel.release FORCE
1115 $(call filechk
,utsrelease.h
)
1119 $(Q
)find
$(srctree
)/include/ -name
'*.h' | xargs
--max-args
1 \
1120 $(srctree
)/scripts
/headerdep.pl
-I
$(srctree
)/include
1122 # ---------------------------------------------------------------------------
1124 INSTALL_FW_PATH
=$(INSTALL_MOD_PATH
)/lib
/firmware
1125 export INSTALL_FW_PATH
1127 PHONY
+= firmware_install
1129 @mkdir
-p
$(objtree
)/firmware
1130 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.fwinst obj
=firmware __fw_install
1132 # ---------------------------------------------------------------------------
1135 #Default location for installed headers
1136 export INSTALL_HDR_PATH
= $(objtree
)/usr
1138 # If we do an all arch process set dst to asm-$(hdr-arch)
1139 hdr-dst
= $(if
$(KBUILD_HEADERS
), dst
=include/asm-
$(hdr-arch
), dst
=include/asm
)
1141 PHONY
+= archheaders
1144 PHONY
+= archscripts
1148 __headers
: $(version_h
) scripts_basic asm-generic archheaders archscripts
1149 $(Q
)$(MAKE
) $(build
)=scripts build_unifdef
1151 PHONY
+= headers_install_all
1152 headers_install_all
:
1153 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
install
1155 PHONY
+= headers_install
1156 headers_install
: __headers
1157 $(if
$(wildcard $(srctree
)/arch
/$(hdr-arch
)/include/uapi
/asm
/Kbuild
),, \
1158 $(error Headers not exportable for the
$(SRCARCH
) architecture
))
1159 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi
1160 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(hdr-arch
)/include/uapi
/asm
$(hdr-dst
)
1161 $(Q
)$(MAKE
) $(hdr-inst
)=ubuntu
/include dst
=include oldheaders
=
1163 PHONY
+= headers_check_all
1164 headers_check_all
: headers_install_all
1165 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
check
1167 PHONY
+= headers_check
1168 headers_check
: headers_install
1169 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi HDRCHECK
=1
1170 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(hdr-arch
)/include/uapi
/asm
$(hdr-dst
) HDRCHECK
=1
1171 $(Q
)$(MAKE
) $(hdr-inst
)=ubuntu
/include dst
=include oldheaders
= HDRCHECK
=1
1173 # ---------------------------------------------------------------------------
1178 $(Q
)$(MAKE
) -C tools
/testing
/selftests run_tests
1181 $(Q
)$(MAKE
) -C tools
/testing
/selftests
clean
1183 PHONY
+= kselftest-merge
1185 $(if
$(wildcard $(objtree
)/.config
),, $(error No .config exists
, config your kernel first
!))
1186 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/kconfig
/merge_config.sh \
1187 -m
$(objtree
)/.config \
1188 $(srctree
)/tools
/testing
/selftests
/*/config
1189 +$(Q
)$(MAKE
) -f
$(srctree
)/Makefile olddefconfig
1191 # ---------------------------------------------------------------------------
1194 ifdef CONFIG_MODULES
1196 # By default, build modules as well
1202 # A module can be listed more than once in obj-m resulting in
1203 # duplicate lines in modules.order files. Those are removed
1204 # using awk while concatenating to the final file.
1207 modules
: $(vmlinux-dirs
) $(if
$(KBUILD_BUILTIN
),vmlinux
) modules.builtin
1208 $(Q
)$(AWK
) '!x[$$0]++' $(vmlinux-dirs
:%=$(objtree
)/%/modules.order
) > $(objtree
)/modules.order
1209 @
$(kecho
) ' Building modules, stage 2.';
1210 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1211 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.fwinst obj
=firmware __fw_modbuild
1213 modules.builtin
: $(vmlinux-dirs
:%=%/modules.builtin
)
1214 $(Q
)$(AWK
) '!x[$$0]++' $^
> $(objtree
)/modules.builtin
1216 %/modules.builtin
: include/config
/auto.conf
1217 $(Q
)$(MAKE
) $(modbuiltin
)=$*
1220 # Target to prepare building external modules
1221 PHONY
+= modules_prepare
1222 modules_prepare
: prepare scripts
1224 # Target to install modules
1225 PHONY
+= modules_install
1226 modules_install
: _modinst_ _modinst_post
1230 @
rm -rf
$(MODLIB
)/kernel
1231 @
rm -f
$(MODLIB
)/source
1232 @mkdir
-p
$(MODLIB
)/kernel
1233 @ln
-s
`cd $(srctree) && /bin/pwd` $(MODLIB
)/source
1234 @if
[ ! $(objtree
) -ef
$(MODLIB
)/build
]; then \
1235 rm -f
$(MODLIB
)/build
; \
1236 ln
-s
$(CURDIR
) $(MODLIB
)/build
; \
1238 @cp
-f
$(objtree
)/modules.order
$(MODLIB
)/
1239 @cp
-f
$(objtree
)/modules.builtin
$(MODLIB
)/
1240 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1242 # This depmod is only for convenience to give the initial
1243 # boot a modules.dep even before / is mounted read-write. However the
1244 # boot script depmod is the master version.
1245 PHONY
+= _modinst_post
1246 _modinst_post
: _modinst_
1247 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.fwinst obj
=firmware __fw_modinst
1250 ifeq ($(CONFIG_MODULE_SIG
), y
)
1251 PHONY
+= modules_sign
1253 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modsign
1256 else # CONFIG_MODULES
1258 # Modules not configured
1259 # ---------------------------------------------------------------------------
1261 PHONY
+= modules modules_install
1262 modules modules_install
:
1264 @echo
>&2 "The present kernel configuration has modules disabled."
1265 @echo
>&2 "Type 'make config' and enable loadable module support."
1266 @echo
>&2 "Then build a kernel with module support enabled."
1270 endif # CONFIG_MODULES
1273 # Cleaning is done on three levels.
1274 # make clean Delete most generated files
1275 # Leave enough to build external modules
1276 # make mrproper Delete the current configuration, and all generated files
1277 # make distclean Remove editor backup files, patch leftover files and the like
1279 # Directories & files removed with 'make clean'
1280 CLEAN_DIRS
+= $(MODVERDIR
)
1282 # Directories & files removed with 'make mrproper'
1283 MRPROPER_DIRS
+= include/config usr
/include include/generated \
1284 arch
/*/include/generated .tmp_objdiff
1285 MRPROPER_FILES
+= .config .config.old .version .old_version \
1286 Module.symvers
tags TAGS cscope
* GPATH GTAGS GRTAGS GSYMS \
1287 signing_key.pem signing_key.priv signing_key.x509 \
1288 x509.genkey extra_certificates signing_key.x509.keyid \
1289 signing_key.x509.signer vmlinux-gdb.py
1291 # clean - Delete most, but leave enough to build external modules
1293 clean: rm-dirs
:= $(CLEAN_DIRS
)
1294 clean: rm-files
:= $(CLEAN_FILES
)
1295 clean-dirs
:= $(addprefix _clean_
, .
$(vmlinux-alldirs
) Documentation samples
)
1297 PHONY
+= $(clean-dirs
) clean archclean vmlinuxclean
1299 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1302 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/link-vmlinux.sh
clean
1303 $(Q
)$(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) clean)
1305 clean: archclean vmlinuxclean
1307 # mrproper - Delete all generated files, including .config
1309 mrproper
: rm-dirs
:= $(wildcard $(MRPROPER_DIRS
))
1310 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
1311 mrproper-dirs
:= $(addprefix _mrproper_
,Documentation
/DocBook scripts
)
1313 PHONY
+= $(mrproper-dirs
) mrproper archmrproper
1315 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
1317 mrproper
: clean archmrproper
$(mrproper-dirs
)
1326 @find
$(srctree
) $(RCS_FIND_IGNORE
) \
1327 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
1328 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'.*.orig' \
1329 -o
-name
'.*.rej' -o
-name
'*%' -o
-name
'core' \
) \
1330 -type f
-print | xargs
rm -f
1333 # Packaging of the kernel to various formats
1334 # ---------------------------------------------------------------------------
1335 # rpm target kept for backward compatibility
1336 package-dir
:= scripts
/package
1339 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1340 %pkg
: include/config
/kernel.release FORCE
1341 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1342 rpm
: include/config
/kernel.release FORCE
1343 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1346 # Brief documentation of the typical targets used
1347 # ---------------------------------------------------------------------------
1349 boards
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*_defconfig
)
1350 boards
:= $(sort $(notdir $(boards
)))
1351 board-dirs
:= $(dir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*/*_defconfig
))
1352 board-dirs
:= $(sort $(notdir $(board-dirs
:/=)))
1356 @echo
'Cleaning targets:'
1357 @echo
' clean - Remove most generated files but keep the config and'
1358 @echo
' enough build support to build external modules'
1359 @echo
' mrproper - Remove all generated files + config + various backup files'
1360 @echo
' distclean - mrproper + remove editor backup and patch files'
1362 @echo
'Configuration targets:'
1363 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
1365 @echo
'Other generic targets:'
1366 @echo
' all - Build all targets marked with [*]'
1367 @echo
'* vmlinux - Build the bare kernel'
1368 @echo
'* modules - Build all modules'
1369 @echo
' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1370 @echo
' firmware_install- Install all firmware to INSTALL_FW_PATH'
1371 @echo
' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1372 @echo
' dir/ - Build all files in dir and below'
1373 @echo
' dir/file.[ois] - Build specified target only'
1374 @echo
' dir/file.lst - Build specified mixed source/assembly target only'
1375 @echo
' (requires a recent binutils and recent build (System.map))'
1376 @echo
' dir/file.ko - Build module including final link'
1377 @echo
' modules_prepare - Set up for building external modules'
1378 @echo
' tags/TAGS - Generate tags file for editors'
1379 @echo
' cscope - Generate cscope index'
1380 @echo
' gtags - Generate GNU GLOBAL index'
1381 @echo
' kernelrelease - Output the release version string (use with make -s)'
1382 @echo
' kernelversion - Output the version stored in Makefile (use with make -s)'
1383 @echo
' image_name - Output the image name (use with make -s)'
1384 @echo
' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1385 echo
' (default: $(INSTALL_HDR_PATH))'; \
1387 @echo
'Static analysers'
1388 @echo
' checkstack - Generate a list of stack hogs'
1389 @echo
' namespacecheck - Name space analysis on compiled kernel'
1390 @echo
' versioncheck - Sanity check on version.h usage'
1391 @echo
' includecheck - Check for duplicate included header files'
1392 @echo
' export_report - List the usages of all exported symbols'
1393 @echo
' headers_check - Sanity check on exported headers'
1394 @echo
' headerdep - Detect inclusion cycles in headers'
1395 @
$(MAKE
) -f
$(srctree
)/scripts
/Makefile.help checker-help
1397 @echo
'Kernel selftest'
1398 @echo
' kselftest - Build and run kernel selftest (run as root)'
1399 @echo
' Build, install, and boot kernel before'
1400 @echo
' running kselftest on it'
1401 @echo
' kselftest-clean - Remove all generated kselftest files'
1402 @echo
' kselftest-merge - Merge all the config dependencies of kselftest to existed'
1405 @echo
'Kernel packaging:'
1406 @
$(MAKE
) $(build
)=$(package-dir
) help
1408 @echo
'Documentation targets:'
1409 @
$(MAKE
) -f
$(srctree
)/Documentation
/Makefile.sphinx dochelp
1411 @
$(MAKE
) -f
$(srctree
)/Documentation
/DocBook
/Makefile dochelp
1413 @echo
'Architecture specific targets ($(SRCARCH)):'
1414 @
$(if
$(archhelp
),$(archhelp
),\
1415 echo
' No architecture specific help defined for $(SRCARCH)')
1418 $(foreach b
, $(boards
), \
1419 printf
" %-24s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
1421 @
$(if
$(board-dirs
), \
1422 $(foreach b
, $(board-dirs
), \
1423 printf
" %-16s - Show %s-specific targets\\n" help-
$(b
) $(b
);) \
1424 printf
" %-16s - Show all of the above\\n" help-boards
; \
1427 @echo
' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1428 @echo
' make V=2 [targets] 2 => give reason for rebuild of target'
1429 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
1430 @echo
' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1431 @echo
' make C=2 [targets] Force check of all c source with $$CHECK'
1432 @echo
' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1433 @echo
' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1434 @echo
' 1: warnings which may be relevant and do not occur too often'
1435 @echo
' 2: warnings which occur quite often but may still be relevant'
1436 @echo
' 3: more obscure warnings, can most likely be ignored'
1437 @echo
' Multiple levels can be combined with W=12 or W=123'
1439 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
1440 @echo
'For further info see the ./README file'
1443 help-board-dirs
:= $(addprefix help-
,$(board-dirs
))
1445 help-boards
: $(help-board-dirs
)
1447 boards-per-dir
= $(sort $(notdir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/$*/*_defconfig
)))
1449 $(help-board-dirs
): help-
%:
1450 @echo
'Architecture specific targets ($(SRCARCH) $*):'
1451 @
$(if
$(boards-per-dir
), \
1452 $(foreach b
, $(boards-per-dir
), \
1453 printf
" %-24s - Build for %s\\n" $*/$(b
) $(subst _defconfig
,,$(b
));) \
1457 # Documentation targets
1458 # ---------------------------------------------------------------------------
1459 DOC_TARGETS
:= xmldocs sgmldocs psdocs latexdocs pdfdocs htmldocs mandocs installmandocs epubdocs cleandocs
1460 PHONY
+= $(DOC_TARGETS
)
1461 $(DOC_TARGETS
): scripts_basic FORCE
1462 $(Q
)$(MAKE
) $(build
)=scripts build_docproc build_check-lc_ctype
1463 $(Q
)$(MAKE
) $(build
)=Documentation
-f
$(srctree
)/Documentation
/Makefile.sphinx
$@
1464 $(Q
)$(MAKE
) $(build
)=Documentation
/DocBook
$@
1466 else # KBUILD_EXTMOD
1469 # External module support.
1470 # When building external modules the kernel used as basis is considered
1471 # read-only, and no consistency checks are made and the make
1472 # system is not used on the basis kernel. If updates are required
1473 # in the basis kernel ordinary make commands (without M=...) must
1476 # The following are the only valid targets when building external
1478 # make M=dir clean Delete all automatically generated files
1479 # make M=dir modules Make all modules in specified dir
1480 # make M=dir Same as 'make M=dir modules'
1481 # make M=dir modules_install
1482 # Install the modules built in the module directory
1483 # Assumes install directory is already created
1485 # We are always building modules
1487 PHONY
+= crmodverdir
1491 PHONY
+= $(objtree
)/Module.symvers
1492 $(objtree
)/Module.symvers
:
1493 @
test -e
$(objtree
)/Module.symvers ||
( \
1495 echo
" WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1496 echo
" is missing; modules will have no dependencies and modversions."; \
1499 module-dirs
:= $(addprefix _module_
,$(KBUILD_EXTMOD
))
1500 PHONY
+= $(module-dirs
) modules
1501 $(module-dirs
): crmodverdir
$(objtree
)/Module.symvers
1502 $(Q
)$(MAKE
) $(build
)=$(patsubst _module_
%,%,$@
)
1504 modules
: $(module-dirs
)
1505 @
$(kecho
) ' Building modules, stage 2.';
1506 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1508 PHONY
+= modules_install
1509 modules_install
: _emodinst_ _emodinst_post
1511 install-dir
:= $(if
$(INSTALL_MOD_DIR
),$(INSTALL_MOD_DIR
),extra
)
1514 $(Q
)mkdir
-p
$(MODLIB
)/$(install-dir
)
1515 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1517 PHONY
+= _emodinst_post
1518 _emodinst_post
: _emodinst_
1521 clean-dirs
:= $(addprefix _clean_
,$(KBUILD_EXTMOD
))
1523 PHONY
+= $(clean-dirs
) clean
1525 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1527 clean: rm-dirs
:= $(MODVERDIR
)
1528 clean: rm-files
:= $(KBUILD_EXTMOD
)/Module.symvers
1532 @echo
' Building external modules.'
1533 @echo
' Syntax: make -C path/to/kernel/src M=$$PWD target'
1535 @echo
' modules - default target, build the module(s)'
1536 @echo
' modules_install - install the module'
1537 @echo
' clean - remove generated files in module directory only'
1541 PHONY
+= prepare scripts
1544 endif # KBUILD_EXTMOD
1546 clean: $(clean-dirs
)
1549 @find
$(if
$(KBUILD_EXTMOD
), $(KBUILD_EXTMOD
), .
) $(RCS_FIND_IGNORE
) \
1550 \
( -name
'*.[oas]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
1554 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
1555 -o
-name
'*.symtypes' -o
-name
'modules.order' \
1556 -o
-name modules.builtin
-o
-name
'.tmp_*.o.*' \
1557 -o
-name
'*.c.[012]*.*' \
1558 -o
-name
'*.gcno' \
) -type f
-print | xargs
rm -f
1560 # Generate tags for editors
1561 # ---------------------------------------------------------------------------
1562 quiet_cmd_tags
= GEN
$@
1563 cmd_tags
= $(CONFIG_SHELL
) $(srctree
)/scripts
/tags.sh
$@
1565 tags TAGS cscope gtags
: FORCE
1568 # Scripts to check various things for consistency
1569 # ---------------------------------------------------------------------------
1571 PHONY
+= includecheck versioncheck coccicheck namespacecheck export_report
1574 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1575 -name
'*.[hcS]' -type f
-print |
sort \
1576 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkincludes.pl
1579 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1580 -name
'*.[hcS]' -type f
-print |
sort \
1581 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkversion.pl
1584 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/$@
1587 $(PERL
) $(srctree
)/scripts
/namespace.pl
1590 $(PERL
) $(srctree
)/scripts
/export_report.pl
1592 endif #ifeq ($(config-targets),1)
1593 endif #ifeq ($(mixed-targets),1)
1595 PHONY
+= checkstack kernelrelease kernelversion image_name
1597 # UML needs a little special treatment here. It wants to use the host
1598 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1599 # else wants $(ARCH), including people doing cross-builds, which means
1600 # that $(SUBARCH) doesn't work here.
1602 CHECKSTACK_ARCH
:= $(SUBARCH
)
1604 CHECKSTACK_ARCH
:= $(ARCH
)
1607 $(OBJDUMP
) -d vmlinux
$$(find .
-name
'*.ko') | \
1608 $(PERL
) $(src
)/scripts
/checkstack.pl
$(CHECKSTACK_ARCH
)
1611 @echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1614 @echo
$(KERNELVERSION
)
1617 @echo
$(KBUILD_IMAGE
)
1619 # Clear a bunch of variables before executing the submake
1621 $(Q
)mkdir
-p
$(objtree
)/tools
1622 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(filter --j% -j,$(MAKEFLAGS))" O
=$(shell cd
$(objtree
) && /bin
/pwd
) subdir
=tools
-C
$(src
)/tools
/
1625 $(Q
)mkdir
-p
$(objtree
)/tools
1626 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(filter --j% -j,$(MAKEFLAGS))" O
=$(shell cd
$(objtree
) && /bin
/pwd
) subdir
=tools
-C
$(src
)/tools
/ $*
1629 # ---------------------------------------------------------------------------
1630 # Single targets are compatible with:
1631 # - build with mixed source and output
1632 # - build with separate output dir 'make O=...'
1633 # - external modules
1635 # target-dir => where to store outputfile
1636 # build-dir => directory in kernel source tree to use
1638 ifeq ($(KBUILD_EXTMOD
),)
1639 build-dir
= $(patsubst %/,%,$(dir $@
))
1640 target-dir
= $(dir $@
)
1642 zap-slash
=$(filter-out .
,$(patsubst %/,%,$(dir $@
)))
1643 build-dir
= $(KBUILD_EXTMOD
)$(if
$(zap-slash
),/$(zap-slash
))
1644 target-dir
= $(if
$(KBUILD_EXTMOD
),$(dir $<),$(dir $@
))
1647 %.s
: %.c prepare scripts FORCE
1648 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1649 %.i
: %.c prepare scripts FORCE
1650 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1651 %.o
: %.c prepare scripts FORCE
1652 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1653 %.lst
: %.c prepare scripts FORCE
1654 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1655 %.s
: %.S prepare scripts FORCE
1656 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1657 %.o
: %.S prepare scripts FORCE
1658 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1659 %.symtypes
: %.c prepare scripts FORCE
1660 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1663 /: prepare scripts FORCE
1665 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1666 $(build
)=$(build-dir
)
1667 # Make sure the latest headers are built for Documentation
1668 Documentation
/ samples
/: headers_install
1669 %/: prepare scripts FORCE
1671 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1672 $(build
)=$(build-dir
)
1673 %.ko
: prepare scripts FORCE
1675 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1676 $(build
)=$(build-dir
) $(@
:.ko
=.o
)
1677 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1679 # FIXME Should go into a make.lib or something
1680 # ===========================================================================
1682 quiet_cmd_rmdirs
= $(if
$(wildcard $(rm-dirs
)),CLEAN
$(wildcard $(rm-dirs
)))
1683 cmd_rmdirs
= rm -rf
$(rm-dirs
)
1685 quiet_cmd_rmfiles
= $(if
$(wildcard $(rm-files
)),CLEAN
$(wildcard $(rm-files
)))
1686 cmd_rmfiles
= rm -f
$(rm-files
)
1688 # Run depmod only if we have System.map and depmod is executable
1689 quiet_cmd_depmod
= DEPMOD
$(KERNELRELEASE
)
1690 cmd_depmod
= $(CONFIG_SHELL
) $(srctree
)/scripts
/depmod.sh
$(DEPMOD
) \
1691 $(KERNELRELEASE
) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1693 # Create temporary dir for module support files
1694 # clean it up only when building all modules
1695 cmd_crmodverdir
= $(Q
)mkdir
-p
$(MODVERDIR
) \
1696 $(if
$(KBUILD_MODULES
),; rm -f
$(MODVERDIR
)/*)
1698 # read all saved command lines
1700 targets
:= $(wildcard $(sort $(targets
)))
1701 cmd_files
:= $(wildcard .
*.cmd
$(foreach f
,$(targets
),$(dir $(f
)).
$(notdir $(f
)).cmd
))
1703 ifneq ($(cmd_files
),)
1704 $(cmd_files
): ; # Do not try to update included dependency files
1705 include $(cmd_files
)
1708 endif # skip-makefile
1713 # Declare the contents of the .PHONY variable as phony. We keep that
1714 # information in a variable so we can use it in if_changed and friends.