5 NAME
= Blurry Fish Butt
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 $(CURDIR
)/Makefile Makefile
: ;
131 ifneq ($(KBUILD_OUTPUT
),)
132 # Invoke a second make in the output directory, passing relevant variables
133 # check that the output directory actually exists
134 saved-output
:= $(KBUILD_OUTPUT
)
135 KBUILD_OUTPUT
:= $(shell mkdir
-p
$(KBUILD_OUTPUT
) && cd
$(KBUILD_OUTPUT
) \
137 $(if
$(KBUILD_OUTPUT
),, \
138 $(error failed to create output directory
"$(saved-output)"))
140 PHONY
+= $(MAKECMDGOALS
) sub-make
142 $(filter-out _all sub-make
$(CURDIR
)/Makefile
, $(MAKECMDGOALS
)) _all
: sub-make
146 $(Q
)$(MAKE
) -C
$(KBUILD_OUTPUT
) KBUILD_SRC
=$(CURDIR
) \
147 -f
$(CURDIR
)/Makefile
$(filter-out _all sub-make
,$(MAKECMDGOALS
))
149 # Leave processing to above invocation of make
151 endif # ifneq ($(KBUILD_OUTPUT),)
152 endif # ifeq ($(KBUILD_SRC),)
154 # We process the rest of the Makefile if this is the final invocation of make
155 ifeq ($(skip-makefile
),)
157 # Do not print "Entering directory ...",
158 # but we want to display it when entering to the output directory
159 # so that IDEs/editors are able to understand relative filenames.
160 MAKEFLAGS
+= --no-print-directory
162 # Call a source code checker (by default, "sparse") as part of the
165 # Use 'make C=1' to enable checking of only re-compiled files.
166 # Use 'make C=2' to enable checking of *all* source files, regardless
167 # of whether they are re-compiled or not.
169 # See the file "Documentation/sparse.txt" for more details, including
170 # where to get the "sparse" utility.
172 ifeq ("$(origin C)", "command line")
173 KBUILD_CHECKSRC
= $(C
)
175 ifndef KBUILD_CHECKSRC
179 # Use make M=dir to specify directory of external module to build
180 # Old syntax make ... SUBDIRS=$PWD is still supported
181 # Setting the environment variable KBUILD_EXTMOD take precedence
183 KBUILD_EXTMOD ?
= $(SUBDIRS
)
186 ifeq ("$(origin M)", "command line")
187 KBUILD_EXTMOD
:= $(M
)
190 # If building an external module we do not care about the all: rule
191 # but instead _all depend on modules
193 ifeq ($(KBUILD_EXTMOD
),)
199 ifeq ($(KBUILD_SRC
),)
200 # building in the source tree
203 ifeq ($(KBUILD_SRC
)/,$(dir $(CURDIR
)))
204 # building in a subdirectory of the source tree
207 srctree
:= $(KBUILD_SRC
)
214 VPATH
:= $(srctree
)$(if
$(KBUILD_EXTMOD
),:$(KBUILD_EXTMOD
))
216 export srctree objtree VPATH
218 # SUBARCH tells the usermode build what the underlying arch is. That is set
219 # first, and if a usermode build is happening, the "ARCH=um" on the command
220 # line overrides the setting of ARCH below. If a native build is happening,
221 # then ARCH is assigned, getting whatever value it gets normally, and
222 # SUBARCH is subsequently ignored.
224 SUBARCH
:= $(shell uname
-m | sed
-e s
/i
.86/x86
/ -e s
/x86_64
/x86
/ \
225 -e s
/sun4u
/sparc64
/ \
226 -e s
/arm.
*/arm
/ -e s
/sa110
/arm
/ \
227 -e s
/s390x
/s390
/ -e s
/parisc64
/parisc
/ \
228 -e s
/ppc.
*/powerpc
/ -e s
/mips.
*/mips
/ \
229 -e s
/sh
[234].
*/sh
/ -e s
/aarch64.
*/arm64
/ )
231 # Cross compiling and selecting different set of gcc/bin-utils
232 # ---------------------------------------------------------------------------
234 # When performing cross compilation for other architectures ARCH shall be set
235 # to the target architecture. (See arch/* for the possibilities).
236 # ARCH can be set during invocation of make:
238 # Another way is to have ARCH set in the environment.
239 # The default ARCH is the host where make is executed.
241 # CROSS_COMPILE specify the prefix used for all executables used
242 # during compilation. Only gcc and related bin-utils executables
243 # are prefixed with $(CROSS_COMPILE).
244 # CROSS_COMPILE can be set on the command line
245 # make CROSS_COMPILE=ia64-linux-
246 # Alternatively CROSS_COMPILE can be set in the environment.
247 # A third alternative is to store a setting in .config so that plain
248 # "make" in the configured kernel build directory always uses that.
249 # Default value for CROSS_COMPILE is not to prefix executables
250 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
252 CROSS_COMPILE ?
= $(CONFIG_CROSS_COMPILE
:"%"=%)
254 # Architecture as present in compile.h
255 UTS_MACHINE
:= $(ARCH
)
258 # Additional ARCH settings for x86
262 ifeq ($(ARCH
),x86_64
)
266 # Additional ARCH settings for sparc
267 ifeq ($(ARCH
),sparc32
)
270 ifeq ($(ARCH
),sparc64
)
274 # Additional ARCH settings for sh
279 # Additional ARCH settings for tile
280 ifeq ($(ARCH
),tilepro
)
283 ifeq ($(ARCH
),tilegx
)
287 # Where to locate arch specific headers
288 hdr-arch
:= $(SRCARCH
)
290 KCONFIG_CONFIG ?
= .config
291 export KCONFIG_CONFIG
293 # SHELL used by kbuild
294 CONFIG_SHELL
:= $(shell if
[ -x
"$$BASH" ]; then echo
$$BASH; \
295 else if
[ -x
/bin
/bash
]; then echo
/bin
/bash
; \
296 else echo sh
; fi
; fi
)
300 HOSTCFLAGS
= -Wall
-Wmissing-prototypes
-Wstrict-prototypes
-O2
-fomit-frame-pointer
-std
=gnu89
303 ifeq ($(shell $(HOSTCC
) -v
2>&1 | grep
-c
"clang version"), 1)
304 HOSTCFLAGS
+= -Wno-unused-value
-Wno-unused-parameter \
305 -Wno-missing-field-initializers
-fno-delete-null-pointer-checks
308 # Decide whether to build built-in, modular, or both.
309 # Normally, just do built-in.
314 # If we have only "make modules", don't compile built-in objects.
315 # When we're building modules with modversions, we need to consider
316 # the built-in objects during the descend as well, in order to
317 # make sure the checksums are up to date before we record them.
319 ifeq ($(MAKECMDGOALS
),modules
)
320 KBUILD_BUILTIN
:= $(if
$(CONFIG_MODVERSIONS
),1)
323 # If we have "make <whatever> modules", compile modules
324 # in addition to whatever we do anyway.
325 # Just "make" or "make all" shall build modules as well
327 ifneq ($(filter all _all modules
,$(MAKECMDGOALS
)),)
331 ifeq ($(MAKECMDGOALS
),)
335 export KBUILD_MODULES KBUILD_BUILTIN
336 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
338 # We need some generic definitions (do not try to remake the file).
339 scripts
/Kbuild.
include: ;
340 include scripts
/Kbuild.
include
342 # Make variables (CC, etc...)
343 AS
= $(CROSS_COMPILE
)as
344 LD
= $(CROSS_COMPILE
)ld
345 CC
= $(CROSS_COMPILE
)gcc
347 AR
= $(CROSS_COMPILE
)ar
348 NM
= $(CROSS_COMPILE
)nm
349 STRIP
= $(CROSS_COMPILE
)strip
350 OBJCOPY
= $(CROSS_COMPILE
)objcopy
351 OBJDUMP
= $(CROSS_COMPILE
)objdump
353 GENKSYMS
= scripts
/genksyms
/genksyms
354 INSTALLKERNEL
:= installkernel
355 DEPMOD
= /sbin
/depmod
360 CHECKFLAGS
:= -D__linux__
-Dlinux
-D__STDC__
-Dunix
-D__unix__ \
361 -Wbitwise
-Wno-return-void
$(CF
)
367 CFLAGS_GCOV
= -fprofile-arcs
-ftest-coverage
370 # Use USERINCLUDE when you must reference the UAPI directories only.
372 -I
$(srctree
)/arch
/$(hdr-arch
)/include/uapi \
373 -Iarch
/$(hdr-arch
)/include/generated
/uapi \
374 -I
$(srctree
)/include/uapi \
375 -Iinclude
/generated
/uapi \
376 -include $(srctree
)/include/linux
/kconfig.h
378 # Use LINUXINCLUDE when you must reference the include/ directory.
379 # Needed to be compatible with the O= option
381 -I
$(srctree
)/arch
/$(hdr-arch
)/include \
382 -Iarch
/$(hdr-arch
)/include/generated
/uapi \
383 -Iarch
/$(hdr-arch
)/include/generated \
384 $(if
$(KBUILD_SRC
), -I
$(srctree
)/include) \
388 KBUILD_CPPFLAGS
:= -D__KERNEL__
390 KBUILD_CFLAGS
:= -Wall
-Wundef
-Wstrict-prototypes
-Wno-trigraphs \
391 -fno-strict-aliasing
-fno-common \
392 -Werror-implicit-function-declaration \
393 -Wno-format-security \
396 KBUILD_AFLAGS_KERNEL
:=
397 KBUILD_CFLAGS_KERNEL
:=
398 KBUILD_AFLAGS
:= -D__ASSEMBLY__
399 KBUILD_AFLAGS_MODULE
:= -DMODULE
400 KBUILD_CFLAGS_MODULE
:= -DMODULE
401 KBUILD_LDFLAGS_MODULE
:= -T
$(srctree
)/scripts
/module-common.lds
403 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
404 KERNELRELEASE
= $(shell cat
include/config
/kernel.release
2> /dev
/null
)
405 KERNELVERSION
= $(VERSION
)$(if
$(PATCHLEVEL
),.
$(PATCHLEVEL
)$(if
$(SUBLEVEL
),.
$(SUBLEVEL
)))$(EXTRAVERSION
)
407 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
408 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
409 export CPP AR NM STRIP OBJCOPY OBJDUMP
410 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
411 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
413 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
414 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KASAN
415 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
416 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
417 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
418 export KBUILD_ARFLAGS
420 # When compiling out-of-tree modules, put MODVERDIR in the module
421 # tree rather than in the kernel tree. The kernel tree might
423 export MODVERDIR
:= $(if
$(KBUILD_EXTMOD
),$(firstword $(KBUILD_EXTMOD
))/).tmp_versions
425 # Files to ignore in find ... statements
427 export RCS_FIND_IGNORE
:= \
( -name SCCS
-o
-name BitKeeper
-o
-name .svn
-o \
428 -name CVS
-o
-name .
pc -o
-name .hg
-o
-name .git \
) \
430 export RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn \
431 --exclude CVS
--exclude .
pc --exclude .hg
--exclude .git
433 # ===========================================================================
434 # Rules shared between *config targets and build targets
436 # Basic helpers built in scripts/
437 PHONY
+= scripts_basic
439 $(Q
)$(MAKE
) $(build
)=scripts
/basic
440 $(Q
)rm -f .tmp_quiet_recordmcount
442 # To avoid any implicit rule to kick in, define an empty command.
443 scripts
/basic
/%: scripts_basic
;
445 PHONY
+= outputmakefile
446 # outputmakefile generates a Makefile in the output directory, if using a
447 # separate output directory. This allows convenient use of make in the
450 ifneq ($(KBUILD_SRC
),)
451 $(Q
)ln
-fsn
$(srctree
) source
452 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/mkmakefile \
453 $(srctree
) $(objtree
) $(VERSION
) $(PATCHLEVEL
)
456 # Support for using generic headers in asm-generic
459 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.asm-generic \
460 src
=asm obj
=arch
/$(SRCARCH
)/include/generated
/asm
461 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.asm-generic \
462 src
=uapi
/asm obj
=arch
/$(SRCARCH
)/include/generated
/uapi
/asm
464 # To make sure we do not include .config for any of the *config targets
465 # catch them early, and hand them over to scripts/kconfig/Makefile
466 # It is allowed to specify more targets when calling make, including
467 # mixing *config targets and build targets.
468 # For example 'make oldconfig all'.
469 # Detect when mixed targets is specified, and make a second invocation
470 # of make so .config is not included in this case either (for *config).
472 version_h
:= include/generated
/uapi
/linux
/version.h
473 old_version_h
:= include/linux
/version.h
475 no-dot-config-targets
:= clean mrproper
distclean \
476 cscope gtags TAGS
tags help
% %docs
check% coccicheck \
477 $(version_h
) headers_
% archheaders archscripts \
478 kernelversion
%src-pkg
484 ifneq ($(filter $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
485 ifeq ($(filter-out $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
490 ifeq ($(KBUILD_EXTMOD
),)
491 ifneq ($(filter config
%config
,$(MAKECMDGOALS
)),)
493 ifneq ($(words $(MAKECMDGOALS
)),1)
499 ifeq ($(mixed-targets
),1)
500 # ===========================================================================
501 # We're called with mixed targets (*config and build targets).
502 # Handle them one by one.
504 PHONY
+= $(MAKECMDGOALS
) __build_one_by_one
506 $(filter-out __build_one_by_one
, $(MAKECMDGOALS
)): __build_one_by_one
511 for i in
$(MAKECMDGOALS
); do \
512 $(MAKE
) -f
$(srctree
)/Makefile
$$i; \
516 ifeq ($(config-targets
),1)
517 # ===========================================================================
518 # *config targets only - make sure prerequisites are updated, and descend
519 # in scripts/kconfig to make the *config target
521 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
522 # KBUILD_DEFCONFIG may point out an alternative default configuration
523 # used for 'make defconfig'
524 include arch
/$(SRCARCH
)/Makefile
525 export KBUILD_DEFCONFIG KBUILD_KCONFIG
527 config
: scripts_basic outputmakefile FORCE
528 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
530 %config
: scripts_basic outputmakefile FORCE
531 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
534 # ===========================================================================
535 # Build targets only - this includes vmlinux, arch specific targets, clean
536 # targets and others. In general all targets except *config targets.
538 ifeq ($(KBUILD_EXTMOD
),)
539 # Additional helpers built in scripts/
540 # Carefully list dependencies so we do not try to build scripts twice
543 scripts
: scripts_basic
include/config
/auto.conf
include/config
/tristate.conf \
545 $(Q
)$(MAKE
) $(build
)=$(@
)
547 # Objects we will link into vmlinux / subdirs we need to visit
549 drivers-y
:= drivers
/ sound
/ firmware
/
554 endif # KBUILD_EXTMOD
556 ifeq ($(dot-config
),1)
558 -include include/config
/auto.conf
560 ifeq ($(KBUILD_EXTMOD
),)
561 # Read in dependencies to all Kconfig* files, make sure to run
562 # oldconfig if changes are detected.
563 -include include/config
/auto.conf.cmd
565 # To avoid any implicit rule to kick in, define an empty command
566 $(KCONFIG_CONFIG
) include/config
/auto.conf.cmd
: ;
568 # If .config is newer than include/config/auto.conf, someone tinkered
569 # with it and forgot to run make oldconfig.
570 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
571 # we execute the config step to be sure to catch updated Kconfig files
572 include/config
/%.conf
: $(KCONFIG_CONFIG
) include/config
/auto.conf.cmd
573 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile silentoldconfig
575 # external modules needs include/generated/autoconf.h and include/config/auto.conf
576 # but do not care if they are up-to-date. Use auto.conf to trigger the test
577 PHONY
+= include/config
/auto.conf
579 include/config
/auto.conf
:
580 $(Q
)test -e
include/generated
/autoconf.h
-a
-e
$@ ||
( \
582 echo
>&2 " ERROR: Kernel configuration is invalid."; \
583 echo
>&2 " include/generated/autoconf.h or $@ are missing.";\
584 echo
>&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
588 endif # KBUILD_EXTMOD
591 # Dummy target needed, because used as prerequisite
592 include/config
/auto.conf
: ;
593 endif # $(dot-config)
595 # The all: target is the default when no target is given on the
597 # This allow a user to issue only 'make' to build a kernel including modules
598 # Defaults to vmlinux, but the arch makefile usually adds further targets
601 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
602 # values of the respective KBUILD_* variables
606 include arch
/$(SRCARCH
)/Makefile
608 KBUILD_CFLAGS
+= $(call cc-option
,-fno-delete-null-pointer-checks
,)
610 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
611 KBUILD_CFLAGS
+= -Os
$(call cc-disable-warning
,maybe-uninitialized
,)
616 # Tell gcc to never replace conditional load with a non-conditional one
617 KBUILD_CFLAGS
+= $(call cc-option
,--param
=allow-store-data-races
=0)
619 ifdef CONFIG_READABLE_ASM
620 # Disable optimizations that make assembler listings hard to read.
621 # reorder blocks reorders the control in the function
622 # ipa clone creates specialized cloned functions
623 # partial inlining inlines only parts of functions
624 KBUILD_CFLAGS
+= $(call cc-option
,-fno-reorder-blocks
,) \
625 $(call cc-option
,-fno-ipa-cp-clone
,) \
626 $(call cc-option
,-fno-partial-inlining
)
629 ifneq ($(CONFIG_FRAME_WARN
),0)
630 KBUILD_CFLAGS
+= $(call cc-option
,-Wframe-larger-than
=${CONFIG_FRAME_WARN})
633 # Handle stack protector mode.
635 # Since kbuild can potentially perform two passes (first with the old
636 # .config values and then with updated .config values), we cannot error out
637 # if a desired compiler option is unsupported. If we were to error, kbuild
638 # could never get to the second pass and actually notice that we changed
639 # the option to something that was supported.
641 # Additionally, we don't want to fallback and/or silently change which compiler
642 # flags will be used, since that leads to producing kernels with different
643 # security feature characteristics depending on the compiler used. ("But I
644 # selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
646 # The middle ground is to warn here so that the failed option is obvious, but
647 # to let the build fail with bad compiler flags so that we can't produce a
648 # kernel when there is a CONFIG and compiler mismatch.
650 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
651 stackp-flag
:= -fstack-protector
652 ifeq ($(call cc-option
, $(stackp-flag
)),)
653 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR
: \
654 -fstack-protector not supported by compiler
)
657 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
658 stackp-flag
:= -fstack-protector-strong
659 ifeq ($(call cc-option
, $(stackp-flag
)),)
660 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG
: \
661 -fstack-protector-strong not supported by compiler
)
664 # Force off for distro compilers that enable stack protector by default.
665 stackp-flag
:= $(call cc-option
, -fno-stack-protector
)
668 KBUILD_CFLAGS
+= $(stackp-flag
)
670 ifeq ($(cc-name
),clang
)
671 KBUILD_CPPFLAGS
+= $(call cc-option
,-Qunused-arguments
,)
672 KBUILD_CPPFLAGS
+= $(call cc-option
,-Wno-unknown-warning-option
,)
673 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-variable
)
674 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-invalid-specifier
)
675 KBUILD_CFLAGS
+= $(call cc-disable-warning
, gnu
)
676 # Quiet clang warning: comparison of unsigned expression < 0 is always false
677 KBUILD_CFLAGS
+= $(call cc-disable-warning
, tautological-compare
)
678 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
679 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
680 # See modpost pattern 2
681 KBUILD_CFLAGS
+= $(call cc-option
, -mno-global-merge
,)
682 KBUILD_CFLAGS
+= $(call cc-option
, -fcatch-undefined-behavior
)
685 # This warning generated too much noise in a regular build.
686 # Use make W=1 to enable this warning (see scripts/Makefile.build)
687 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-but-set-variable
)
690 ifdef CONFIG_FRAME_POINTER
691 KBUILD_CFLAGS
+= -fno-omit-frame-pointer
-fno-optimize-sibling-calls
693 # Some targets (ARM with Thumb2, for example), can't be built with frame
694 # pointers. For those, we don't have FUNCTION_TRACER automatically
695 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
696 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
697 # -fomit-frame-pointer with FUNCTION_TRACER.
698 ifndef CONFIG_FUNCTION_TRACER
699 KBUILD_CFLAGS
+= -fomit-frame-pointer
703 KBUILD_CFLAGS
+= $(call cc-option
, -fno-var-tracking-assignments
)
705 ifdef CONFIG_DEBUG_INFO
706 ifdef CONFIG_DEBUG_INFO_SPLIT
707 KBUILD_CFLAGS
+= $(call cc-option
, -gsplit-dwarf
, -g
)
711 KBUILD_AFLAGS
+= -Wa
,-gdwarf-2
713 ifdef CONFIG_DEBUG_INFO_DWARF4
714 KBUILD_CFLAGS
+= $(call cc-option
, -gdwarf-4
,)
717 ifdef CONFIG_DEBUG_INFO_REDUCED
718 KBUILD_CFLAGS
+= $(call cc-option
, -femit-struct-debug-baseonly
) \
719 $(call cc-option
,-fno-var-tracking
)
722 ifdef CONFIG_FUNCTION_TRACER
723 ifndef CC_FLAGS_FTRACE
724 CC_FLAGS_FTRACE
:= -pg
726 export CC_FLAGS_FTRACE
727 ifdef CONFIG_HAVE_FENTRY
728 CC_USING_FENTRY
:= $(call cc-option
, -mfentry
-DCC_USING_FENTRY
)
730 KBUILD_CFLAGS
+= $(CC_FLAGS_FTRACE
) $(CC_USING_FENTRY
)
731 KBUILD_AFLAGS
+= $(CC_USING_FENTRY
)
732 ifdef CONFIG_DYNAMIC_FTRACE
733 ifdef CONFIG_HAVE_C_RECORDMCOUNT
734 BUILD_C_RECORDMCOUNT
:= y
735 export BUILD_C_RECORDMCOUNT
740 # We trigger additional mismatches with less inlining
741 ifdef CONFIG_DEBUG_SECTION_MISMATCH
742 KBUILD_CFLAGS
+= $(call cc-option
, -fno-inline-functions-called-once
)
745 # arch Makefile may override CC so keep this after arch Makefile is included
746 NOSTDINC_FLAGS
+= -nostdinc
-isystem
$(shell $(CC
) -print-file-name
=include)
747 CHECKFLAGS
+= $(NOSTDINC_FLAGS
)
749 # warn about C99 declaration after statement
750 KBUILD_CFLAGS
+= $(call cc-option
,-Wdeclaration-after-statement
,)
752 # disable pointer signed / unsigned warnings in gcc 4.0
753 KBUILD_CFLAGS
+= $(call cc-disable-warning
, pointer-sign
)
755 # disable invalid "can't wrap" optimizations for signed / pointers
756 KBUILD_CFLAGS
+= $(call cc-option
,-fno-strict-overflow
)
758 # conserve stack if available
759 KBUILD_CFLAGS
+= $(call cc-option
,-fconserve-stack
)
761 # disallow errors like 'EXPORT_GPL(foo);' with missing header
762 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=implicit-int
)
764 # require functions to have arguments in prototypes, not empty 'int foo()'
765 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=strict-prototypes
)
767 # Prohibit date/time macros, which would make the build non-deterministic
768 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=date-time
)
770 # use the deterministic mode of AR if available
771 KBUILD_ARFLAGS
:= $(call ar-option
,D
)
773 # check for 'asm goto'
774 ifeq ($(shell $(CONFIG_SHELL
) $(srctree
)/scripts
/gcc-goto.sh
$(CC
)), y
)
775 KBUILD_CFLAGS
+= -DCC_HAVE_ASM_GOTO
776 KBUILD_AFLAGS
+= -DCC_HAVE_ASM_GOTO
779 include scripts
/Makefile.kasan
780 include scripts
/Makefile.extrawarn
782 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
784 KBUILD_CPPFLAGS
+= $(ARCH_CPPFLAGS
) $(KCPPFLAGS
)
785 KBUILD_AFLAGS
+= $(ARCH_AFLAGS
) $(KAFLAGS
)
786 KBUILD_CFLAGS
+= $(ARCH_CFLAGS
) $(KCFLAGS
)
788 # Use --build-id when available.
789 LDFLAGS_BUILD_ID
= $(patsubst -Wl
$(comma
)%,%,\
790 $(call cc-ldoption
, -Wl
$(comma
)--build-id
,))
791 KBUILD_LDFLAGS_MODULE
+= $(LDFLAGS_BUILD_ID
)
792 LDFLAGS_vmlinux
+= $(LDFLAGS_BUILD_ID
)
794 ifeq ($(CONFIG_STRIP_ASM_SYMS
),y
)
795 LDFLAGS_vmlinux
+= $(call ld-option
, -X
,)
798 # Default kernel image to build when no specific target is given.
799 # KBUILD_IMAGE may be overruled on the command line or
800 # set in the environment
801 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
803 export KBUILD_IMAGE ?
= vmlinux
806 # INSTALL_PATH specifies where to place the updated kernel and system map
807 # images. Default is /boot, but you can set it to other values
808 export INSTALL_PATH ?
= /boot
811 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
812 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
813 # an argument if needed. Otherwise it defaults to the kernel install path
815 export INSTALL_DTBS_PATH ?
= $(INSTALL_PATH
)/dtbs
/$(KERNELRELEASE
)
818 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
819 # relocations required by build roots. This is not defined in the
820 # makefile but the argument can be passed to make if needed.
823 MODLIB
= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
827 # INSTALL_MOD_STRIP, if defined, will cause modules to be
828 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
829 # the default option --strip-debug will be used. Otherwise,
830 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
832 ifdef INSTALL_MOD_STRIP
833 ifeq ($(INSTALL_MOD_STRIP
),1)
834 mod_strip_cmd
= $(STRIP
) --strip-debug
836 mod_strip_cmd
= $(STRIP
) $(INSTALL_MOD_STRIP
)
837 endif # INSTALL_MOD_STRIP=1
840 endif # INSTALL_MOD_STRIP
843 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
844 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
845 # or CONFIG_MODULE_COMPRESS_XZ.
847 mod_compress_cmd
= true
848 ifdef CONFIG_MODULE_COMPRESS
849 ifdef CONFIG_MODULE_COMPRESS_GZIP
850 mod_compress_cmd
= gzip
-n
-f
851 endif # CONFIG_MODULE_COMPRESS_GZIP
852 ifdef CONFIG_MODULE_COMPRESS_XZ
853 mod_compress_cmd
= xz
-f
854 endif # CONFIG_MODULE_COMPRESS_XZ
855 endif # CONFIG_MODULE_COMPRESS
856 export mod_compress_cmd
858 # Select initial ramdisk compression format, default is gzip(1).
859 # This shall be used by the dracut(8) tool while creating an initramfs image.
861 INITRD_COMPRESS-y
:= gzip
862 INITRD_COMPRESS-
$(CONFIG_RD_BZIP2
) := bzip2
863 INITRD_COMPRESS-
$(CONFIG_RD_LZMA
) := lzma
864 INITRD_COMPRESS-
$(CONFIG_RD_XZ
) := xz
865 INITRD_COMPRESS-
$(CONFIG_RD_LZO
) := lzo
866 INITRD_COMPRESS-
$(CONFIG_RD_LZ4
) := lz4
867 # do not export INITRD_COMPRESS, since we didn't actually
868 # choose a sane default compression above.
869 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
871 ifdef CONFIG_MODULE_SIG_ALL
872 $(eval
$(call config_filename
,MODULE_SIG_KEY
))
874 mod_sign_cmd
= scripts
/sign-file
$(CONFIG_MODULE_SIG_HASH
) $(MODULE_SIG_KEY_SRCPREFIX
)$(CONFIG_MODULE_SIG_KEY
) certs
/signing_key.x509
881 ifeq ($(KBUILD_EXTMOD
),)
882 core-y
+= kernel
/ certs
/ mm
/ fs
/ ipc
/ security
/ crypto
/ block
/
884 vmlinux-dirs
:= $(patsubst %/,%,$(filter %/, $(init-y
) $(init-m
) \
885 $(core-y
) $(core-m
) $(drivers-y
) $(drivers-m
) \
886 $(net-y
) $(net-m
) $(libs-y
) $(libs-m
) $(virt-y
)))
888 vmlinux-alldirs
:= $(sort $(vmlinux-dirs
) $(patsubst %/,%,$(filter %/, \
889 $(init-
) $(core-
) $(drivers-
) $(net-
) $(libs-
) $(virt-
))))
891 init-y
:= $(patsubst %/, %/built-in.o
, $(init-y
))
892 core-y
:= $(patsubst %/, %/built-in.o
, $(core-y
))
893 drivers-y
:= $(patsubst %/, %/built-in.o
, $(drivers-y
))
894 net-y
:= $(patsubst %/, %/built-in.o
, $(net-y
))
895 libs-y1
:= $(patsubst %/, %/lib.a
, $(libs-y
))
896 libs-y2
:= $(patsubst %/, %/built-in.o
, $(libs-y
))
897 libs-y
:= $(libs-y1
) $(libs-y2
)
898 virt-y
:= $(patsubst %/, %/built-in.o
, $(virt-y
))
900 # Externally visible symbols (used by link-vmlinux.sh)
901 export KBUILD_VMLINUX_INIT
:= $(head-y
) $(init-y
)
902 export KBUILD_VMLINUX_MAIN
:= $(core-y
) $(libs-y
) $(drivers-y
) $(net-y
) $(virt-y
)
903 export KBUILD_LDS
:= arch
/$(SRCARCH
)/kernel
/vmlinux.lds
904 export LDFLAGS_vmlinux
905 # used by scripts/pacmage/Makefile
906 export KBUILD_ALLDIRS
:= $(sort $(filter-out arch
/%,$(vmlinux-alldirs
)) arch Documentation
include samples scripts tools
)
908 vmlinux-deps
:= $(KBUILD_LDS
) $(KBUILD_VMLINUX_INIT
) $(KBUILD_VMLINUX_MAIN
)
910 # Final link of vmlinux
911 cmd_link-vmlinux
= $(CONFIG_SHELL
) $< $(LD
) $(LDFLAGS
) $(LDFLAGS_vmlinux
)
912 quiet_cmd_link-vmlinux
= LINK
$@
914 # Include targets which we want to
915 # execute if the rest of the kernel build went well.
916 vmlinux
: scripts
/link-vmlinux.sh
$(vmlinux-deps
) FORCE
917 ifdef CONFIG_HEADERS_CHECK
918 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile headers_check
921 $(Q
)$(MAKE
) $(build
)=samples
923 ifdef CONFIG_BUILD_DOCSRC
924 $(Q
)$(MAKE
) $(build
)=Documentation
926 ifdef CONFIG_GDB_SCRIPTS
927 $(Q
)ln
-fsn
`cd $(srctree) && /bin/pwd`/scripts
/gdb
/vmlinux-gdb.py
929 +$(call if_changed
,link-vmlinux
)
931 # The actual objects are generated when descending,
932 # make sure no implicit rule kicks in
933 $(sort $(vmlinux-deps
)): $(vmlinux-dirs
) ;
935 # Handle descending into subdirectories listed in $(vmlinux-dirs)
936 # Preset locale variables to speed up the build process. Limit locale
937 # tweaks to this spot to avoid wrong language settings when running
938 # make menuconfig etc.
939 # Error messages still appears in the original language
941 PHONY
+= $(vmlinux-dirs
)
942 $(vmlinux-dirs
): prepare scripts
943 $(Q
)$(MAKE
) $(build
)=$@
945 define filechk_kernel.release
946 echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
949 # Store (new) KERNELRELEASE string in include/config/kernel.release
950 include/config
/kernel.release
: include/config
/auto.conf FORCE
951 $(call filechk
,kernel.release
)
954 # Things we need to do before we recursively start building the kernel
955 # or the modules are listed in "prepare".
956 # A multi level approach is used. prepareN is processed before prepareN-1.
957 # archprepare is used in arch Makefiles and when processed asm symlink,
958 # version.h and scripts_basic is processed / created.
960 # Listed in dependency order
961 PHONY
+= prepare archprepare prepare0 prepare1 prepare2 prepare3
963 # prepare3 is used to check if we are building in a separate output directory,
965 # 1) Check that make has not been executed in the kernel src $(srctree)
966 prepare3
: include/config
/kernel.release
967 ifneq ($(KBUILD_SRC
),)
968 @
$(kecho
) ' Using $(srctree) as source for kernel'
969 $(Q
)if
[ -f
$(srctree
)/.config
-o
-d
$(srctree
)/include/config
]; then \
970 echo
>&2 " $(srctree) is not clean, please run 'make mrproper'"; \
971 echo
>&2 " in the '$(srctree)' directory.";\
976 # prepare2 creates a makefile if using a separate output directory
977 prepare2
: prepare3 outputmakefile asm-generic
979 prepare1
: prepare2
$(version_h
) include/generated
/utsrelease.h \
980 include/config
/auto.conf
983 archprepare
: archheaders archscripts prepare1 scripts_basic
985 prepare0
: archprepare FORCE
986 $(Q
)$(MAKE
) $(build
)=.
988 # All the preparing..
991 # Generate some files
992 # ---------------------------------------------------------------------------
994 # KERNELRELEASE can change from a few different places, meaning version.h
995 # needs to be updated, so this check is forced on all builds
998 define filechk_utsrelease.h
999 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
1000 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1003 (echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1006 define filechk_version.h
1007 (echo \
#define LINUX_VERSION_CODE $(shell \
1008 expr
$(VERSION
) \
* 65536 + 0$(PATCHLEVEL
) \
* 256 + 0$(SUBLEVEL
)); \
1009 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1012 $(version_h
): $(srctree
)/Makefile FORCE
1013 $(call filechk
,version.h
)
1014 $(Q
)rm -f
$(old_version_h
)
1016 include/generated
/utsrelease.h
: include/config
/kernel.release FORCE
1017 $(call filechk
,utsrelease.h
)
1021 $(Q
)find
$(srctree
)/include/ -name
'*.h' | xargs
--max-args
1 \
1022 $(srctree
)/scripts
/headerdep.pl
-I
$(srctree
)/include
1024 # ---------------------------------------------------------------------------
1026 INSTALL_FW_PATH
=$(INSTALL_MOD_PATH
)/lib
/firmware
1027 export INSTALL_FW_PATH
1029 PHONY
+= firmware_install
1030 firmware_install
: FORCE
1031 @mkdir
-p
$(objtree
)/firmware
1032 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.fwinst obj
=firmware __fw_install
1034 # ---------------------------------------------------------------------------
1037 #Default location for installed headers
1038 export INSTALL_HDR_PATH
= $(objtree
)/usr
1040 # If we do an all arch process set dst to asm-$(hdr-arch)
1041 hdr-dst
= $(if
$(KBUILD_HEADERS
), dst
=include/asm-
$(hdr-arch
), dst
=include/asm
)
1043 PHONY
+= archheaders
1046 PHONY
+= archscripts
1050 __headers
: $(version_h
) scripts_basic asm-generic archheaders archscripts FORCE
1051 $(Q
)$(MAKE
) $(build
)=scripts build_unifdef
1053 PHONY
+= headers_install_all
1054 headers_install_all
:
1055 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
install
1057 PHONY
+= headers_install
1058 headers_install
: __headers
1059 $(if
$(wildcard $(srctree
)/arch
/$(hdr-arch
)/include/uapi
/asm
/Kbuild
),, \
1060 $(error Headers not exportable for the
$(SRCARCH
) architecture
))
1061 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi
1062 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(hdr-arch
)/include/uapi
/asm
$(hdr-dst
)
1064 PHONY
+= headers_check_all
1065 headers_check_all
: headers_install_all
1066 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
check
1068 PHONY
+= headers_check
1069 headers_check
: headers_install
1070 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi HDRCHECK
=1
1071 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(hdr-arch
)/include/uapi
/asm
$(hdr-dst
) HDRCHECK
=1
1073 # ---------------------------------------------------------------------------
1078 $(Q
)$(MAKE
) -C tools
/testing
/selftests run_tests
1081 $(Q
)$(MAKE
) -C tools
/testing
/selftests
clean
1083 # ---------------------------------------------------------------------------
1086 ifdef CONFIG_MODULES
1088 # By default, build modules as well
1094 # A module can be listed more than once in obj-m resulting in
1095 # duplicate lines in modules.order files. Those are removed
1096 # using awk while concatenating to the final file.
1099 modules
: $(vmlinux-dirs
) $(if
$(KBUILD_BUILTIN
),vmlinux
) modules.builtin
1100 $(Q
)$(AWK
) '!x[$$0]++' $(vmlinux-dirs
:%=$(objtree
)/%/modules.order
) > $(objtree
)/modules.order
1101 @
$(kecho
) ' Building modules, stage 2.';
1102 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1103 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.fwinst obj
=firmware __fw_modbuild
1105 modules.builtin
: $(vmlinux-dirs
:%=%/modules.builtin
)
1106 $(Q
)$(AWK
) '!x[$$0]++' $^
> $(objtree
)/modules.builtin
1108 %/modules.builtin
: include/config
/auto.conf
1109 $(Q
)$(MAKE
) $(modbuiltin
)=$*
1112 # Target to prepare building external modules
1113 PHONY
+= modules_prepare
1114 modules_prepare
: prepare scripts
1116 # Target to install modules
1117 PHONY
+= modules_install
1118 modules_install
: _modinst_ _modinst_post
1122 @
rm -rf
$(MODLIB
)/kernel
1123 @
rm -f
$(MODLIB
)/source
1124 @mkdir
-p
$(MODLIB
)/kernel
1125 @ln
-s
`cd $(srctree) && /bin/pwd` $(MODLIB
)/source
1126 @if
[ ! $(objtree
) -ef
$(MODLIB
)/build
]; then \
1127 rm -f
$(MODLIB
)/build
; \
1128 ln
-s
$(CURDIR
) $(MODLIB
)/build
; \
1130 @cp
-f
$(objtree
)/modules.order
$(MODLIB
)/
1131 @cp
-f
$(objtree
)/modules.builtin
$(MODLIB
)/
1132 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1134 # This depmod is only for convenience to give the initial
1135 # boot a modules.dep even before / is mounted read-write. However the
1136 # boot script depmod is the master version.
1137 PHONY
+= _modinst_post
1138 _modinst_post
: _modinst_
1139 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.fwinst obj
=firmware __fw_modinst
1142 ifeq ($(CONFIG_MODULE_SIG
), y
)
1143 PHONY
+= modules_sign
1145 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modsign
1148 else # CONFIG_MODULES
1150 # Modules not configured
1151 # ---------------------------------------------------------------------------
1153 modules modules_install
: FORCE
1155 @echo
>&2 "The present kernel configuration has modules disabled."
1156 @echo
>&2 "Type 'make config' and enable loadable module support."
1157 @echo
>&2 "Then build a kernel with module support enabled."
1161 endif # CONFIG_MODULES
1164 # Cleaning is done on three levels.
1165 # make clean Delete most generated files
1166 # Leave enough to build external modules
1167 # make mrproper Delete the current configuration, and all generated files
1168 # make distclean Remove editor backup files, patch leftover files and the like
1170 # Directories & files removed with 'make clean'
1171 CLEAN_DIRS
+= $(MODVERDIR
)
1173 # Directories & files removed with 'make mrproper'
1174 MRPROPER_DIRS
+= include/config usr
/include include/generated \
1175 arch
/*/include/generated .tmp_objdiff
1176 MRPROPER_FILES
+= .config .config.old .version .old_version \
1177 Module.symvers
tags TAGS cscope
* GPATH GTAGS GRTAGS GSYMS \
1178 signing_key.pem signing_key.priv signing_key.x509 \
1179 x509.genkey extra_certificates signing_key.x509.keyid \
1180 signing_key.x509.signer vmlinux-gdb.py
1182 # clean - Delete most, but leave enough to build external modules
1184 clean: rm-dirs
:= $(CLEAN_DIRS
)
1185 clean: rm-files
:= $(CLEAN_FILES
)
1186 clean-dirs
:= $(addprefix _clean_
, .
$(vmlinux-alldirs
) Documentation samples
)
1188 PHONY
+= $(clean-dirs
) clean archclean vmlinuxclean
1190 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1193 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/link-vmlinux.sh
clean
1195 clean: archclean vmlinuxclean
1197 # mrproper - Delete all generated files, including .config
1199 mrproper
: rm-dirs
:= $(wildcard $(MRPROPER_DIRS
))
1200 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
1201 mrproper-dirs
:= $(addprefix _mrproper_
,Documentation
/DocBook scripts
)
1203 PHONY
+= $(mrproper-dirs
) mrproper archmrproper
1205 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
1207 mrproper
: clean archmrproper
$(mrproper-dirs
)
1216 @find
$(srctree
) $(RCS_FIND_IGNORE
) \
1217 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
1218 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'.*.orig' \
1219 -o
-name
'.*.rej' -o
-name
'*%' -o
-name
'core' \
) \
1220 -type f
-print | xargs
rm -f
1223 # Packaging of the kernel to various formats
1224 # ---------------------------------------------------------------------------
1225 # rpm target kept for backward compatibility
1226 package-dir
:= scripts
/package
1229 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1230 %pkg
: include/config
/kernel.release FORCE
1231 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1232 rpm
: include/config
/kernel.release FORCE
1233 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1236 # Brief documentation of the typical targets used
1237 # ---------------------------------------------------------------------------
1239 boards
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*_defconfig
)
1240 boards
:= $(sort $(notdir $(boards
)))
1241 board-dirs
:= $(dir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*/*_defconfig
))
1242 board-dirs
:= $(sort $(notdir $(board-dirs
:/=)))
1245 @echo
'Cleaning targets:'
1246 @echo
' clean - Remove most generated files but keep the config and'
1247 @echo
' enough build support to build external modules'
1248 @echo
' mrproper - Remove all generated files + config + various backup files'
1249 @echo
' distclean - mrproper + remove editor backup and patch files'
1251 @echo
'Configuration targets:'
1252 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
1254 @echo
'Other generic targets:'
1255 @echo
' all - Build all targets marked with [*]'
1256 @echo
'* vmlinux - Build the bare kernel'
1257 @echo
'* modules - Build all modules'
1258 @echo
' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1259 @echo
' firmware_install- Install all firmware to INSTALL_FW_PATH'
1260 @echo
' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1261 @echo
' dir/ - Build all files in dir and below'
1262 @echo
' dir/file.[oisS] - Build specified target only'
1263 @echo
' dir/file.lst - Build specified mixed source/assembly target only'
1264 @echo
' (requires a recent binutils and recent build (System.map))'
1265 @echo
' dir/file.ko - Build module including final link'
1266 @echo
' modules_prepare - Set up for building external modules'
1267 @echo
' tags/TAGS - Generate tags file for editors'
1268 @echo
' cscope - Generate cscope index'
1269 @echo
' gtags - Generate GNU GLOBAL index'
1270 @echo
' kernelrelease - Output the release version string (use with make -s)'
1271 @echo
' kernelversion - Output the version stored in Makefile (use with make -s)'
1272 @echo
' image_name - Output the image name (use with make -s)'
1273 @echo
' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1274 echo
' (default: $(INSTALL_HDR_PATH))'; \
1276 @echo
'Static analysers'
1277 @echo
' checkstack - Generate a list of stack hogs'
1278 @echo
' namespacecheck - Name space analysis on compiled kernel'
1279 @echo
' versioncheck - Sanity check on version.h usage'
1280 @echo
' includecheck - Check for duplicate included header files'
1281 @echo
' export_report - List the usages of all exported symbols'
1282 @echo
' headers_check - Sanity check on exported headers'
1283 @echo
' headerdep - Detect inclusion cycles in headers'
1284 @
$(MAKE
) -f
$(srctree
)/scripts
/Makefile.help checker-help
1286 @echo
'Kernel selftest'
1287 @echo
' kselftest - Build and run kernel selftest (run as root)'
1288 @echo
' Build, install, and boot kernel before'
1289 @echo
' running kselftest on it'
1290 @echo
' kselftest-clean - Remove all generated kselftest files'
1292 @echo
'Kernel packaging:'
1293 @
$(MAKE
) $(build
)=$(package-dir
) help
1295 @echo
'Documentation targets:'
1296 @
$(MAKE
) -f
$(srctree
)/Documentation
/DocBook
/Makefile dochelp
1298 @echo
'Architecture specific targets ($(SRCARCH)):'
1299 @
$(if
$(archhelp
),$(archhelp
),\
1300 echo
' No architecture specific help defined for $(SRCARCH)')
1303 $(foreach b
, $(boards
), \
1304 printf
" %-24s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
1306 @
$(if
$(board-dirs
), \
1307 $(foreach b
, $(board-dirs
), \
1308 printf
" %-16s - Show %s-specific targets\\n" help-
$(b
) $(b
);) \
1309 printf
" %-16s - Show all of the above\\n" help-boards
; \
1312 @echo
' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1313 @echo
' make V=2 [targets] 2 => give reason for rebuild of target'
1314 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
1315 @echo
' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1316 @echo
' make C=2 [targets] Force check of all c source with $$CHECK'
1317 @echo
' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1318 @echo
' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1319 @echo
' 1: warnings which may be relevant and do not occur too often'
1320 @echo
' 2: warnings which occur quite often but may still be relevant'
1321 @echo
' 3: more obscure warnings, can most likely be ignored'
1322 @echo
' Multiple levels can be combined with W=12 or W=123'
1324 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
1325 @echo
'For further info see the ./README file'
1328 help-board-dirs
:= $(addprefix help-
,$(board-dirs
))
1330 help-boards
: $(help-board-dirs
)
1332 boards-per-dir
= $(sort $(notdir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/$*/*_defconfig
)))
1334 $(help-board-dirs
): help-
%:
1335 @echo
'Architecture specific targets ($(SRCARCH) $*):'
1336 @
$(if
$(boards-per-dir
), \
1337 $(foreach b
, $(boards-per-dir
), \
1338 printf
" %-24s - Build for %s\\n" $*/$(b
) $(subst _defconfig
,,$(b
));) \
1342 # Documentation targets
1343 # ---------------------------------------------------------------------------
1344 %docs
: scripts_basic FORCE
1345 $(Q
)$(MAKE
) $(build
)=scripts build_docproc build_check-lc_ctype
1346 $(Q
)$(MAKE
) $(build
)=Documentation
/DocBook
$@
1348 else # KBUILD_EXTMOD
1351 # External module support.
1352 # When building external modules the kernel used as basis is considered
1353 # read-only, and no consistency checks are made and the make
1354 # system is not used on the basis kernel. If updates are required
1355 # in the basis kernel ordinary make commands (without M=...) must
1358 # The following are the only valid targets when building external
1360 # make M=dir clean Delete all automatically generated files
1361 # make M=dir modules Make all modules in specified dir
1362 # make M=dir Same as 'make M=dir modules'
1363 # make M=dir modules_install
1364 # Install the modules built in the module directory
1365 # Assumes install directory is already created
1367 # We are always building modules
1369 PHONY
+= crmodverdir
1373 PHONY
+= $(objtree
)/Module.symvers
1374 $(objtree
)/Module.symvers
:
1375 @
test -e
$(objtree
)/Module.symvers ||
( \
1377 echo
" WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1378 echo
" is missing; modules will have no dependencies and modversions."; \
1381 module-dirs
:= $(addprefix _module_
,$(KBUILD_EXTMOD
))
1382 PHONY
+= $(module-dirs
) modules
1383 $(module-dirs
): crmodverdir
$(objtree
)/Module.symvers
1384 $(Q
)$(MAKE
) $(build
)=$(patsubst _module_
%,%,$@
)
1386 modules
: $(module-dirs
)
1387 @
$(kecho
) ' Building modules, stage 2.';
1388 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1390 PHONY
+= modules_install
1391 modules_install
: _emodinst_ _emodinst_post
1393 install-dir
:= $(if
$(INSTALL_MOD_DIR
),$(INSTALL_MOD_DIR
),extra
)
1396 $(Q
)mkdir
-p
$(MODLIB
)/$(install-dir
)
1397 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1399 PHONY
+= _emodinst_post
1400 _emodinst_post
: _emodinst_
1403 clean-dirs
:= $(addprefix _clean_
,$(KBUILD_EXTMOD
))
1405 PHONY
+= $(clean-dirs
) clean
1407 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1409 clean: rm-dirs
:= $(MODVERDIR
)
1410 clean: rm-files
:= $(KBUILD_EXTMOD
)/Module.symvers
1413 @echo
' Building external modules.'
1414 @echo
' Syntax: make -C path/to/kernel/src M=$$PWD target'
1416 @echo
' modules - default target, build the module(s)'
1417 @echo
' modules_install - install the module'
1418 @echo
' clean - remove generated files in module directory only'
1422 PHONY
+= prepare scripts
1425 endif # KBUILD_EXTMOD
1427 clean: $(clean-dirs
)
1430 @find
$(if
$(KBUILD_EXTMOD
), $(KBUILD_EXTMOD
), .
) $(RCS_FIND_IGNORE
) \
1431 \
( -name
'*.[oas]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
1435 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
1436 -o
-name
'*.symtypes' -o
-name
'modules.order' \
1437 -o
-name modules.builtin
-o
-name
'.tmp_*.o.*' \
1438 -o
-name
'*.gcno' \
) -type f
-print | xargs
rm -f
1440 # Generate tags for editors
1441 # ---------------------------------------------------------------------------
1442 quiet_cmd_tags
= GEN
$@
1443 cmd_tags
= $(CONFIG_SHELL
) $(srctree
)/scripts
/tags.sh
$@
1445 tags TAGS cscope gtags
: FORCE
1448 # Scripts to check various things for consistency
1449 # ---------------------------------------------------------------------------
1451 PHONY
+= includecheck versioncheck coccicheck namespacecheck export_report
1454 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1455 -name
'*.[hcS]' -type f
-print |
sort \
1456 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkincludes.pl
1459 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1460 -name
'*.[hcS]' -type f
-print |
sort \
1461 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkversion.pl
1464 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/$@
1467 $(PERL
) $(srctree
)/scripts
/namespace.pl
1470 $(PERL
) $(srctree
)/scripts
/export_report.pl
1472 endif #ifeq ($(config-targets),1)
1473 endif #ifeq ($(mixed-targets),1)
1475 PHONY
+= checkstack kernelrelease kernelversion image_name
1477 # UML needs a little special treatment here. It wants to use the host
1478 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1479 # else wants $(ARCH), including people doing cross-builds, which means
1480 # that $(SUBARCH) doesn't work here.
1482 CHECKSTACK_ARCH
:= $(SUBARCH
)
1484 CHECKSTACK_ARCH
:= $(ARCH
)
1487 $(OBJDUMP
) -d vmlinux
$$(find .
-name
'*.ko') | \
1488 $(PERL
) $(src
)/scripts
/checkstack.pl
$(CHECKSTACK_ARCH
)
1491 @echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1494 @echo
$(KERNELVERSION
)
1497 @echo
$(KBUILD_IMAGE
)
1499 # Clear a bunch of variables before executing the submake
1501 $(Q
)mkdir
-p
$(objtree
)/tools
1502 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(filter --j% -j,$(MAKEFLAGS))" O
=$(O
) subdir
=tools
-C
$(src
)/tools
/
1505 $(Q
)mkdir
-p
$(objtree
)/tools
1506 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(filter --j% -j,$(MAKEFLAGS))" O
=$(O
) subdir
=tools
-C
$(src
)/tools
/ $*
1509 # ---------------------------------------------------------------------------
1510 # Single targets are compatible with:
1511 # - build with mixed source and output
1512 # - build with separate output dir 'make O=...'
1513 # - external modules
1515 # target-dir => where to store outputfile
1516 # build-dir => directory in kernel source tree to use
1518 ifeq ($(KBUILD_EXTMOD
),)
1519 build-dir
= $(patsubst %/,%,$(dir $@
))
1520 target-dir
= $(dir $@
)
1522 zap-slash
=$(filter-out .
,$(patsubst %/,%,$(dir $@
)))
1523 build-dir
= $(KBUILD_EXTMOD
)$(if
$(zap-slash
),/$(zap-slash
))
1524 target-dir
= $(if
$(KBUILD_EXTMOD
),$(dir $<),$(dir $@
))
1527 %.s
: %.c prepare scripts FORCE
1528 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1529 %.i
: %.c prepare scripts FORCE
1530 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1531 %.o
: %.c prepare scripts FORCE
1532 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1533 %.lst
: %.c prepare scripts FORCE
1534 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1535 %.s
: %.S prepare scripts FORCE
1536 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1537 %.o
: %.S prepare scripts FORCE
1538 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1539 %.symtypes
: %.c prepare scripts FORCE
1540 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1543 /: prepare scripts FORCE
1545 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1546 $(build
)=$(build-dir
)
1547 # Make sure the latest headers are built for Documentation
1548 Documentation
/: headers_install
1549 %/: prepare scripts FORCE
1551 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1552 $(build
)=$(build-dir
)
1553 %.ko
: prepare scripts FORCE
1555 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1556 $(build
)=$(build-dir
) $(@
:.ko
=.o
)
1557 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1559 # FIXME Should go into a make.lib or something
1560 # ===========================================================================
1562 quiet_cmd_rmdirs
= $(if
$(wildcard $(rm-dirs
)),CLEAN
$(wildcard $(rm-dirs
)))
1563 cmd_rmdirs
= rm -rf
$(rm-dirs
)
1565 quiet_cmd_rmfiles
= $(if
$(wildcard $(rm-files
)),CLEAN
$(wildcard $(rm-files
)))
1566 cmd_rmfiles
= rm -f
$(rm-files
)
1568 # Run depmod only if we have System.map and depmod is executable
1569 quiet_cmd_depmod
= DEPMOD
$(KERNELRELEASE
)
1570 cmd_depmod
= $(CONFIG_SHELL
) $(srctree
)/scripts
/depmod.sh
$(DEPMOD
) \
1571 $(KERNELRELEASE
) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1573 # Create temporary dir for module support files
1574 # clean it up only when building all modules
1575 cmd_crmodverdir
= $(Q
)mkdir
-p
$(MODVERDIR
) \
1576 $(if
$(KBUILD_MODULES
),; rm -f
$(MODVERDIR
)/*)
1578 # read all saved command lines
1580 targets
:= $(wildcard $(sort $(targets
)))
1581 cmd_files
:= $(wildcard .
*.cmd
$(foreach f
,$(targets
),$(dir $(f
)).
$(notdir $(f
)).cmd
))
1583 ifneq ($(cmd_files
),)
1584 $(cmd_files
): ; # Do not try to update included dependency files
1585 include $(cmd_files
)
1588 endif # skip-makefile
1593 # Declare the contents of the .PHONY variable as phony. We keep that
1594 # information in a variable so we can use it in if_changed and friends.