5 NAME
= Psychotic Stoned Sheep
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
,)
377 # Use USERINCLUDE when you must reference the UAPI directories only.
379 -I
$(srctree
)/arch
/$(hdr-arch
)/include/uapi \
380 -I
$(objtree
)/arch
/$(hdr-arch
)/include/generated
/uapi \
381 -I
$(srctree
)/include/uapi \
382 -I
$(objtree
)/include/generated
/uapi \
383 -include $(srctree
)/include/linux
/kconfig.h
385 # Use LINUXINCLUDE when you must reference the include/ directory.
386 # Needed to be compatible with the O= option
388 -I
$(srctree
)/arch
/$(hdr-arch
)/include \
389 -I
$(objtree
)/arch
/$(hdr-arch
)/include/generated
/uapi \
390 -I
$(objtree
)/arch
/$(hdr-arch
)/include/generated \
391 $(if
$(KBUILD_SRC
), -I
$(srctree
)/include) \
394 LINUXINCLUDE
+= $(filter-out $(LINUXINCLUDE
),$(USERINCLUDE
))
396 KBUILD_CPPFLAGS
:= -D__KERNEL__
398 KBUILD_CFLAGS
:= -Wall
-Wundef
-Wstrict-prototypes
-Wno-trigraphs \
399 -fno-strict-aliasing
-fno-common \
400 -Werror-implicit-function-declaration \
401 -Wno-format-security \
402 -std
=gnu89
$(call cc-option
,-fno-PIE
)
405 KBUILD_AFLAGS_KERNEL
:=
406 KBUILD_CFLAGS_KERNEL
:=
407 KBUILD_AFLAGS
:= -D__ASSEMBLY__
$(call cc-option
,-fno-PIE
)
408 KBUILD_AFLAGS_MODULE
:= -DMODULE
409 KBUILD_CFLAGS_MODULE
:= -DMODULE
410 KBUILD_LDFLAGS_MODULE
:= -T
$(srctree
)/scripts
/module-common.lds
412 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
413 KERNELRELEASE
= $(shell cat
include/config
/kernel.release
2> /dev
/null
)
414 KERNELVERSION
= $(VERSION
)$(if
$(PATCHLEVEL
),.
$(PATCHLEVEL
)$(if
$(SUBLEVEL
),.
$(SUBLEVEL
)))$(EXTRAVERSION
)
416 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
417 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
418 export CPP AR NM STRIP OBJCOPY OBJDUMP
419 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
420 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
422 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
423 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
424 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
425 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
426 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
427 export KBUILD_ARFLAGS
429 # When compiling out-of-tree modules, put MODVERDIR in the module
430 # tree rather than in the kernel tree. The kernel tree might
432 export MODVERDIR
:= $(if
$(KBUILD_EXTMOD
),$(firstword $(KBUILD_EXTMOD
))/).tmp_versions
434 # Files to ignore in find ... statements
436 export RCS_FIND_IGNORE
:= \
( -name SCCS
-o
-name BitKeeper
-o
-name .svn
-o \
437 -name CVS
-o
-name .
pc -o
-name .hg
-o
-name .git \
) \
439 export RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn \
440 --exclude CVS
--exclude .
pc --exclude .hg
--exclude .git
442 # ===========================================================================
443 # Rules shared between *config targets and build targets
445 # Basic helpers built in scripts/
446 PHONY
+= scripts_basic
448 $(Q
)$(MAKE
) $(build
)=scripts
/basic
449 $(Q
)rm -f .tmp_quiet_recordmcount
451 # To avoid any implicit rule to kick in, define an empty command.
452 scripts
/basic
/%: scripts_basic
;
454 PHONY
+= outputmakefile
455 # outputmakefile generates a Makefile in the output directory, if using a
456 # separate output directory. This allows convenient use of make in the
459 ifneq ($(KBUILD_SRC
),)
460 $(Q
)ln
-fsn
$(srctree
) source
461 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/mkmakefile \
462 $(srctree
) $(objtree
) $(VERSION
) $(PATCHLEVEL
)
465 # Support for using generic headers in asm-generic
468 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.asm-generic \
469 src
=asm obj
=arch
/$(SRCARCH
)/include/generated
/asm
470 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.asm-generic \
471 src
=uapi
/asm obj
=arch
/$(SRCARCH
)/include/generated
/uapi
/asm
473 # To make sure we do not include .config for any of the *config targets
474 # catch them early, and hand them over to scripts/kconfig/Makefile
475 # It is allowed to specify more targets when calling make, including
476 # mixing *config targets and build targets.
477 # For example 'make oldconfig all'.
478 # Detect when mixed targets is specified, and make a second invocation
479 # of make so .config is not included in this case either (for *config).
481 version_h
:= include/generated
/uapi
/linux
/version.h
482 old_version_h
:= include/linux
/version.h
484 no-dot-config-targets
:= clean mrproper
distclean \
485 cscope gtags TAGS
tags help
% %docs
check% coccicheck \
486 $(version_h
) headers_
% archheaders archscripts \
487 kernelversion
%src-pkg
493 ifneq ($(filter $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
494 ifeq ($(filter-out $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
499 ifeq ($(KBUILD_EXTMOD
),)
500 ifneq ($(filter config
%config
,$(MAKECMDGOALS
)),)
502 ifneq ($(words $(MAKECMDGOALS
)),1)
507 # install and module_install need also be processed one by one
508 ifneq ($(filter install,$(MAKECMDGOALS
)),)
509 ifneq ($(filter modules_install
,$(MAKECMDGOALS
)),)
514 ifeq ($(mixed-targets
),1)
515 # ===========================================================================
516 # We're called with mixed targets (*config and build targets).
517 # Handle them one by one.
519 PHONY
+= $(MAKECMDGOALS
) __build_one_by_one
521 $(filter-out __build_one_by_one
, $(MAKECMDGOALS
)): __build_one_by_one
526 for i in
$(MAKECMDGOALS
); do \
527 $(MAKE
) -f
$(srctree
)/Makefile
$$i; \
531 ifeq ($(config-targets
),1)
532 # ===========================================================================
533 # *config targets only - make sure prerequisites are updated, and descend
534 # in scripts/kconfig to make the *config target
536 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
537 # KBUILD_DEFCONFIG may point out an alternative default configuration
538 # used for 'make defconfig'
539 include arch
/$(SRCARCH
)/Makefile
540 export KBUILD_DEFCONFIG KBUILD_KCONFIG
542 config
: scripts_basic outputmakefile FORCE
543 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
545 %config
: scripts_basic outputmakefile FORCE
546 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
549 # ===========================================================================
550 # Build targets only - this includes vmlinux, arch specific targets, clean
551 # targets and others. In general all targets except *config targets.
553 ifeq ($(KBUILD_EXTMOD
),)
554 # Additional helpers built in scripts/
555 # Carefully list dependencies so we do not try to build scripts twice
558 scripts
: scripts_basic
include/config
/auto.conf
include/config
/tristate.conf \
559 asm-generic gcc-plugins
560 $(Q
)$(MAKE
) $(build
)=$(@
)
562 # Objects we will link into vmlinux / subdirs we need to visit
564 drivers-y
:= drivers
/ sound
/ firmware
/
569 endif # KBUILD_EXTMOD
571 ifeq ($(dot-config
),1)
573 -include include/config
/auto.conf
575 ifeq ($(KBUILD_EXTMOD
),)
576 # Read in dependencies to all Kconfig* files, make sure to run
577 # oldconfig if changes are detected.
578 -include include/config
/auto.conf.cmd
580 # To avoid any implicit rule to kick in, define an empty command
581 $(KCONFIG_CONFIG
) include/config
/auto.conf.cmd
: ;
583 # If .config is newer than include/config/auto.conf, someone tinkered
584 # with it and forgot to run make oldconfig.
585 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
586 # we execute the config step to be sure to catch updated Kconfig files
587 include/config
/%.conf
: $(KCONFIG_CONFIG
) include/config
/auto.conf.cmd
588 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile silentoldconfig
590 # external modules needs include/generated/autoconf.h and include/config/auto.conf
591 # but do not care if they are up-to-date. Use auto.conf to trigger the test
592 PHONY
+= include/config
/auto.conf
594 include/config
/auto.conf
:
595 $(Q
)test -e
include/generated
/autoconf.h
-a
-e
$@ ||
( \
597 echo
>&2 " ERROR: Kernel configuration is invalid."; \
598 echo
>&2 " include/generated/autoconf.h or $@ are missing.";\
599 echo
>&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
603 endif # KBUILD_EXTMOD
606 # Dummy target needed, because used as prerequisite
607 include/config
/auto.conf
: ;
608 endif # $(dot-config)
610 # The all: target is the default when no target is given on the
612 # This allow a user to issue only 'make' to build a kernel including modules
613 # Defaults to vmlinux, but the arch makefile usually adds further targets
616 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
617 # values of the respective KBUILD_* variables
621 include arch
/$(SRCARCH
)/Makefile
623 KBUILD_CFLAGS
+= $(call cc-option
,-fno-delete-null-pointer-checks
,)
624 KBUILD_CFLAGS
+= $(call cc-disable-warning
,frame-address
,)
626 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
627 KBUILD_CFLAGS
+= $(call cc-option
,-ffunction-sections
,)
628 KBUILD_CFLAGS
+= $(call cc-option
,-fdata-sections
,)
631 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
632 KBUILD_CFLAGS
+= -Os
$(call cc-disable-warning
,maybe-uninitialized
,)
634 ifdef CONFIG_PROFILE_ALL_BRANCHES
635 KBUILD_CFLAGS
+= -O2
$(call cc-disable-warning
,maybe-uninitialized
,)
641 KBUILD_CFLAGS
+= $(call cc-ifversion
, -lt
, 0409, \
642 $(call cc-disable-warning
,maybe-uninitialized
,))
644 # Tell gcc to never replace conditional load with a non-conditional one
645 KBUILD_CFLAGS
+= $(call cc-option
,--param
=allow-store-data-races
=0)
647 include scripts
/Makefile.gcc-plugins
649 ifdef CONFIG_READABLE_ASM
650 # Disable optimizations that make assembler listings hard to read.
651 # reorder blocks reorders the control in the function
652 # ipa clone creates specialized cloned functions
653 # partial inlining inlines only parts of functions
654 KBUILD_CFLAGS
+= $(call cc-option
,-fno-reorder-blocks
,) \
655 $(call cc-option
,-fno-ipa-cp-clone
,) \
656 $(call cc-option
,-fno-partial-inlining
)
659 ifneq ($(CONFIG_FRAME_WARN
),0)
660 KBUILD_CFLAGS
+= $(call cc-option
,-Wframe-larger-than
=${CONFIG_FRAME_WARN})
663 # This selects the stack protector compiler flag. Testing it is delayed
664 # until after .config has been reprocessed, in the prepare-compiler-check
666 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
667 stackp-flag
:= -fstack-protector
668 stackp-name
:= REGULAR
670 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
671 stackp-flag
:= -fstack-protector-strong
672 stackp-name
:= STRONG
674 # Force off for distro compilers that enable stack protector by default.
675 stackp-flag
:= $(call cc-option
, -fno-stack-protector
)
678 # Find arch-specific stack protector compiler sanity-checking script.
679 ifdef CONFIG_CC_STACKPROTECTOR
680 stackp-path
:= $(srctree
)/scripts
/gcc-
$(SRCARCH
)_
$(BITS
)-has-stack-protector.sh
681 stackp-check
:= $(wildcard $(stackp-path
))
683 KBUILD_CFLAGS
+= $(stackp-flag
)
685 ifeq ($(cc-name
),clang
)
686 KBUILD_CPPFLAGS
+= $(call cc-option
,-Qunused-arguments
,)
687 KBUILD_CPPFLAGS
+= $(call cc-option
,-Wno-unknown-warning-option
,)
688 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-variable
)
689 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-invalid-specifier
)
690 KBUILD_CFLAGS
+= $(call cc-disable-warning
, gnu
)
691 # Quiet clang warning: comparison of unsigned expression < 0 is always false
692 KBUILD_CFLAGS
+= $(call cc-disable-warning
, tautological-compare
)
693 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
694 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
695 # See modpost pattern 2
696 KBUILD_CFLAGS
+= $(call cc-option
, -mno-global-merge
,)
697 KBUILD_CFLAGS
+= $(call cc-option
, -fcatch-undefined-behavior
)
700 # These warnings generated too much noise in a regular build.
701 # Use make W=1 to enable them (see scripts/Makefile.build)
702 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-but-set-variable
)
703 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-const-variable
)
706 ifdef CONFIG_FRAME_POINTER
707 KBUILD_CFLAGS
+= -fno-omit-frame-pointer
-fno-optimize-sibling-calls
709 # Some targets (ARM with Thumb2, for example), can't be built with frame
710 # pointers. For those, we don't have FUNCTION_TRACER automatically
711 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
712 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
713 # -fomit-frame-pointer with FUNCTION_TRACER.
714 ifndef CONFIG_FUNCTION_TRACER
715 KBUILD_CFLAGS
+= -fomit-frame-pointer
719 KBUILD_CFLAGS
+= $(call cc-option
, -fno-var-tracking-assignments
)
721 ifdef CONFIG_DEBUG_INFO
722 ifdef CONFIG_DEBUG_INFO_SPLIT
723 KBUILD_CFLAGS
+= $(call cc-option
, -gsplit-dwarf
, -g
)
727 KBUILD_AFLAGS
+= -Wa
,-gdwarf-2
729 ifdef CONFIG_DEBUG_INFO_DWARF4
730 KBUILD_CFLAGS
+= $(call cc-option
, -gdwarf-4
,)
733 ifdef CONFIG_DEBUG_INFO_REDUCED
734 KBUILD_CFLAGS
+= $(call cc-option
, -femit-struct-debug-baseonly
) \
735 $(call cc-option
,-fno-var-tracking
)
738 ifdef CONFIG_FUNCTION_TRACER
739 ifndef CC_FLAGS_FTRACE
740 CC_FLAGS_FTRACE
:= -pg
742 export CC_FLAGS_FTRACE
743 ifdef CONFIG_HAVE_FENTRY
744 CC_USING_FENTRY
:= $(call cc-option
, -mfentry
-DCC_USING_FENTRY
)
746 KBUILD_CFLAGS
+= $(CC_FLAGS_FTRACE
) $(CC_USING_FENTRY
)
747 KBUILD_AFLAGS
+= $(CC_USING_FENTRY
)
748 ifdef CONFIG_DYNAMIC_FTRACE
749 ifdef CONFIG_HAVE_C_RECORDMCOUNT
750 BUILD_C_RECORDMCOUNT
:= y
751 export BUILD_C_RECORDMCOUNT
756 # We trigger additional mismatches with less inlining
757 ifdef CONFIG_DEBUG_SECTION_MISMATCH
758 KBUILD_CFLAGS
+= $(call cc-option
, -fno-inline-functions-called-once
)
761 # arch Makefile may override CC so keep this after arch Makefile is included
762 NOSTDINC_FLAGS
+= -nostdinc
-isystem
$(shell $(CC
) -print-file-name
=include)
763 CHECKFLAGS
+= $(NOSTDINC_FLAGS
)
765 # warn about C99 declaration after statement
766 KBUILD_CFLAGS
+= $(call cc-option
,-Wdeclaration-after-statement
,)
768 # disable pointer signed / unsigned warnings in gcc 4.0
769 KBUILD_CFLAGS
+= $(call cc-disable-warning
, pointer-sign
)
771 # disable invalid "can't wrap" optimizations for signed / pointers
772 KBUILD_CFLAGS
+= $(call cc-option
,-fno-strict-overflow
)
774 # conserve stack if available
775 KBUILD_CFLAGS
+= $(call cc-option
,-fconserve-stack
)
777 # disallow errors like 'EXPORT_GPL(foo);' with missing header
778 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=implicit-int
)
780 # require functions to have arguments in prototypes, not empty 'int foo()'
781 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=strict-prototypes
)
783 # Prohibit date/time macros, which would make the build non-deterministic
784 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=date-time
)
786 # enforce correct pointer usage
787 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=incompatible-pointer-types
)
789 # use the deterministic mode of AR if available
790 KBUILD_ARFLAGS
:= $(call ar-option
,D
)
792 # check for 'asm goto'
793 ifeq ($(shell $(CONFIG_SHELL
) $(srctree
)/scripts
/gcc-goto.sh
$(CC
)), y
)
794 KBUILD_CFLAGS
+= -DCC_HAVE_ASM_GOTO
795 KBUILD_AFLAGS
+= -DCC_HAVE_ASM_GOTO
798 include scripts
/Makefile.kasan
799 include scripts
/Makefile.extrawarn
800 include scripts
/Makefile.ubsan
802 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
804 KBUILD_CPPFLAGS
+= $(ARCH_CPPFLAGS
) $(KCPPFLAGS
)
805 KBUILD_AFLAGS
+= $(ARCH_AFLAGS
) $(KAFLAGS
)
806 KBUILD_CFLAGS
+= $(ARCH_CFLAGS
) $(KCFLAGS
)
808 # Use --build-id when available.
809 LDFLAGS_BUILD_ID
= $(patsubst -Wl
$(comma
)%,%,\
810 $(call cc-ldoption
, -Wl
$(comma
)--build-id
,))
811 KBUILD_LDFLAGS_MODULE
+= $(LDFLAGS_BUILD_ID
)
812 LDFLAGS_vmlinux
+= $(LDFLAGS_BUILD_ID
)
814 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
815 LDFLAGS_vmlinux
+= $(call ld-option
, --gc-sections
,)
818 ifeq ($(CONFIG_STRIP_ASM_SYMS
),y
)
819 LDFLAGS_vmlinux
+= $(call ld-option
, -X
,)
822 # Default kernel image to build when no specific target is given.
823 # KBUILD_IMAGE may be overruled on the command line or
824 # set in the environment
825 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
827 export KBUILD_IMAGE ?
= vmlinux
830 # INSTALL_PATH specifies where to place the updated kernel and system map
831 # images. Default is /boot, but you can set it to other values
832 export INSTALL_PATH ?
= /boot
835 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
836 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
837 # an argument if needed. Otherwise it defaults to the kernel install path
839 export INSTALL_DTBS_PATH ?
= $(INSTALL_PATH
)/dtbs
/$(KERNELRELEASE
)
842 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
843 # relocations required by build roots. This is not defined in the
844 # makefile but the argument can be passed to make if needed.
847 MODLIB
= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
851 # INSTALL_MOD_STRIP, if defined, will cause modules to be
852 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
853 # the default option --strip-debug will be used. Otherwise,
854 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
856 ifdef INSTALL_MOD_STRIP
857 ifeq ($(INSTALL_MOD_STRIP
),1)
858 mod_strip_cmd
= $(STRIP
) --strip-debug
860 mod_strip_cmd
= $(STRIP
) $(INSTALL_MOD_STRIP
)
861 endif # INSTALL_MOD_STRIP=1
864 endif # INSTALL_MOD_STRIP
867 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
868 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
869 # or CONFIG_MODULE_COMPRESS_XZ.
871 mod_compress_cmd
= true
872 ifdef CONFIG_MODULE_COMPRESS
873 ifdef CONFIG_MODULE_COMPRESS_GZIP
874 mod_compress_cmd
= gzip
-n
-f
875 endif # CONFIG_MODULE_COMPRESS_GZIP
876 ifdef CONFIG_MODULE_COMPRESS_XZ
877 mod_compress_cmd
= xz
-f
878 endif # CONFIG_MODULE_COMPRESS_XZ
879 endif # CONFIG_MODULE_COMPRESS
880 export mod_compress_cmd
882 # Select initial ramdisk compression format, default is gzip(1).
883 # This shall be used by the dracut(8) tool while creating an initramfs image.
885 INITRD_COMPRESS-y
:= gzip
886 INITRD_COMPRESS-
$(CONFIG_RD_BZIP2
) := bzip2
887 INITRD_COMPRESS-
$(CONFIG_RD_LZMA
) := lzma
888 INITRD_COMPRESS-
$(CONFIG_RD_XZ
) := xz
889 INITRD_COMPRESS-
$(CONFIG_RD_LZO
) := lzo
890 INITRD_COMPRESS-
$(CONFIG_RD_LZ4
) := lz4
891 # do not export INITRD_COMPRESS, since we didn't actually
892 # choose a sane default compression above.
893 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
895 ifdef CONFIG_MODULE_SIG_ALL
896 $(eval
$(call config_filename
,MODULE_SIG_KEY
))
898 mod_sign_cmd
= scripts
/sign-file
$(CONFIG_MODULE_SIG_HASH
) $(MODULE_SIG_KEY_SRCPREFIX
)$(CONFIG_MODULE_SIG_KEY
) certs
/signing_key.x509
905 ifeq ($(KBUILD_EXTMOD
),)
906 core-y
+= kernel
/ certs
/ mm
/ fs
/ ipc
/ security
/ crypto
/ block
/
908 vmlinux-dirs
:= $(patsubst %/,%,$(filter %/, $(init-y
) $(init-m
) \
909 $(core-y
) $(core-m
) $(drivers-y
) $(drivers-m
) \
910 $(net-y
) $(net-m
) $(libs-y
) $(libs-m
) $(virt-y
)))
912 vmlinux-alldirs
:= $(sort $(vmlinux-dirs
) $(patsubst %/,%,$(filter %/, \
913 $(init-
) $(core-
) $(drivers-
) $(net-
) $(libs-
) $(virt-
))))
915 init-y
:= $(patsubst %/, %/built-in.o
, $(init-y
))
916 core-y
:= $(patsubst %/, %/built-in.o
, $(core-y
))
917 drivers-y
:= $(patsubst %/, %/built-in.o
, $(drivers-y
))
918 net-y
:= $(patsubst %/, %/built-in.o
, $(net-y
))
919 libs-y1
:= $(patsubst %/, %/lib.a
, $(libs-y
))
920 libs-y2
:= $(patsubst %/, %/built-in.o
, $(libs-y
))
921 libs-y
:= $(libs-y1
) $(libs-y2
)
922 virt-y
:= $(patsubst %/, %/built-in.o
, $(virt-y
))
924 # Externally visible symbols (used by link-vmlinux.sh)
925 export KBUILD_VMLINUX_INIT
:= $(head-y
) $(init-y
)
926 export KBUILD_VMLINUX_MAIN
:= $(core-y
) $(libs-y
) $(drivers-y
) $(net-y
) $(virt-y
)
927 export KBUILD_LDS
:= arch
/$(SRCARCH
)/kernel
/vmlinux.lds
928 export LDFLAGS_vmlinux
929 # used by scripts/pacmage/Makefile
930 export KBUILD_ALLDIRS
:= $(sort $(filter-out arch
/%,$(vmlinux-alldirs
)) arch Documentation
include samples scripts tools
)
932 vmlinux-deps
:= $(KBUILD_LDS
) $(KBUILD_VMLINUX_INIT
) $(KBUILD_VMLINUX_MAIN
)
934 # Include targets which we want to execute sequentially if the rest of the
935 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
936 # evaluated more than once.
937 PHONY
+= vmlinux_prereq
938 vmlinux_prereq
: $(vmlinux-deps
) FORCE
939 ifdef CONFIG_HEADERS_CHECK
940 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile headers_check
942 ifdef CONFIG_GDB_SCRIPTS
943 $(Q
)ln
-fsn
`cd $(srctree) && /bin/pwd`/scripts
/gdb
/vmlinux-gdb.py
945 ifdef CONFIG_TRIM_UNUSED_KSYMS
946 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/adjust_autoksyms.sh \
947 "$(MAKE) KBUILD_MODULES=1 -f $(srctree)/Makefile vmlinux_prereq"
950 # standalone target for easier testing
951 include/generated
/autoksyms.h
: FORCE
952 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/adjust_autoksyms.sh true
954 ARCH_POSTLINK
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/Makefile.postlink
)
956 # Final link of vmlinux with optional arch pass after final link
958 $(CONFIG_SHELL
) $< $(LD
) $(LDFLAGS
) $(LDFLAGS_vmlinux
) ; \
959 $(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) $@
, true
)
961 vmlinux
: scripts
/link-vmlinux.sh vmlinux_prereq
$(vmlinux-deps
) FORCE
962 +$(call if_changed
,link-vmlinux
)
964 # Build samples along the rest of the kernel
966 vmlinux-dirs
+= samples
969 # The actual objects are generated when descending,
970 # make sure no implicit rule kicks in
971 $(sort $(vmlinux-deps
)): $(vmlinux-dirs
) ;
973 # Handle descending into subdirectories listed in $(vmlinux-dirs)
974 # Preset locale variables to speed up the build process. Limit locale
975 # tweaks to this spot to avoid wrong language settings when running
976 # make menuconfig etc.
977 # Error messages still appears in the original language
979 PHONY
+= $(vmlinux-dirs
)
980 $(vmlinux-dirs
): prepare scripts
981 $(Q
)$(MAKE
) $(build
)=$@
983 define filechk_kernel.release
984 echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
987 # Store (new) KERNELRELEASE string in include/config/kernel.release
988 include/config
/kernel.release
: include/config
/auto.conf FORCE
989 $(call filechk
,kernel.release
)
992 # Things we need to do before we recursively start building the kernel
993 # or the modules are listed in "prepare".
994 # A multi level approach is used. prepareN is processed before prepareN-1.
995 # archprepare is used in arch Makefiles and when processed asm symlink,
996 # version.h and scripts_basic is processed / created.
998 # Listed in dependency order
999 PHONY
+= prepare archprepare prepare0 prepare1 prepare2 prepare3
1001 # prepare3 is used to check if we are building in a separate output directory,
1003 # 1) Check that make has not been executed in the kernel src $(srctree)
1004 prepare3
: include/config
/kernel.release
1005 ifneq ($(KBUILD_SRC
),)
1006 @
$(kecho
) ' Using $(srctree) as source for kernel'
1007 $(Q
)if
[ -f
$(srctree
)/.config
-o
-d
$(srctree
)/include/config
]; then \
1008 echo
>&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1009 echo
>&2 " in the '$(srctree)' directory.";\
1014 # prepare2 creates a makefile if using a separate output directory.
1015 # From this point forward, .config has been reprocessed, so any rules
1016 # that need to depend on updated CONFIG_* values can be checked here.
1017 prepare2
: prepare3 prepare-compiler-check outputmakefile asm-generic
1019 prepare1
: prepare2
$(version_h
) include/generated
/utsrelease.h \
1020 include/config
/auto.conf
1022 $(Q
)test -e
include/generated
/autoksyms.h || \
1023 touch
include/generated
/autoksyms.h
1025 archprepare
: archheaders archscripts prepare1 scripts_basic
1027 prepare0
: archprepare gcc-plugins
1028 $(Q
)$(MAKE
) $(build
)=.
1030 # All the preparing..
1031 prepare
: prepare0 prepare-objtool
1033 ifdef CONFIG_STACK_VALIDATION
1034 has_libelf
:= $(call try-run
,\
1035 echo
"int main() {}" |
$(HOSTCC
) -xc
-o
/dev
/null
-lelf
-,1,0)
1036 ifeq ($(has_libelf
),1)
1037 objtool_target
:= tools
/objtool FORCE
1039 $(warning
"Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
1040 SKIP_STACK_VALIDATION
:= 1
1041 export SKIP_STACK_VALIDATION
1045 PHONY
+= prepare-objtool
1046 prepare-objtool
: $(objtool_target
)
1048 # Check for CONFIG flags that require compiler support. Abort the build
1049 # after .config has been processed, but before the kernel build starts.
1051 # For security-sensitive CONFIG options, we don't want to fallback and/or
1052 # silently change which compiler flags will be used, since that leads to
1053 # producing kernels with different security feature characteristics
1054 # depending on the compiler used. (For example, "But I selected
1055 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1056 PHONY
+= prepare-compiler-check
1057 prepare-compiler-check
: FORCE
1058 # Make sure compiler supports requested stack protector flag.
1060 ifeq ($(call cc-option
, $(stackp-flag
)),)
1061 @echo Cannot use CONFIG_CC_STACKPROTECTOR_
$(stackp-name
): \
1062 $(stackp-flag
) not supported by compiler
>&2 && exit
1
1065 # Make sure compiler does not have buggy stack-protector support.
1067 ifneq ($(shell $(CONFIG_SHELL
) $(stackp-check
) $(CC
) $(KBUILD_CPPFLAGS
) $(biarch
)),y
)
1068 @echo Cannot use CONFIG_CC_STACKPROTECTOR_
$(stackp-name
): \
1069 $(stackp-flag
) available but compiler is broken
>&2 && exit
1
1074 # Generate some files
1075 # ---------------------------------------------------------------------------
1077 # KERNELRELEASE can change from a few different places, meaning version.h
1078 # needs to be updated, so this check is forced on all builds
1081 define filechk_utsrelease.h
1082 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
1083 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1086 (echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1089 define filechk_version.h
1090 (echo \
#define LINUX_VERSION_CODE $(shell \
1091 expr
$(VERSION
) \
* 65536 + 0$(PATCHLEVEL
) \
* 256 + 0$(SUBLEVEL
)); \
1092 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1095 $(version_h
): $(srctree
)/Makefile FORCE
1096 $(call filechk
,version.h
)
1097 $(Q
)rm -f
$(old_version_h
)
1099 include/generated
/utsrelease.h
: include/config
/kernel.release FORCE
1100 $(call filechk
,utsrelease.h
)
1104 $(Q
)find
$(srctree
)/include/ -name
'*.h' | xargs
--max-args
1 \
1105 $(srctree
)/scripts
/headerdep.pl
-I
$(srctree
)/include
1107 # ---------------------------------------------------------------------------
1109 INSTALL_FW_PATH
=$(INSTALL_MOD_PATH
)/lib
/firmware
1110 export INSTALL_FW_PATH
1112 PHONY
+= firmware_install
1114 @mkdir
-p
$(objtree
)/firmware
1115 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.fwinst obj
=firmware __fw_install
1117 # ---------------------------------------------------------------------------
1120 #Default location for installed headers
1121 export INSTALL_HDR_PATH
= $(objtree
)/usr
1123 # If we do an all arch process set dst to asm-$(hdr-arch)
1124 hdr-dst
= $(if
$(KBUILD_HEADERS
), dst
=include/asm-
$(hdr-arch
), dst
=include/asm
)
1126 PHONY
+= archheaders
1129 PHONY
+= archscripts
1133 __headers
: $(version_h
) scripts_basic asm-generic archheaders archscripts
1134 $(Q
)$(MAKE
) $(build
)=scripts build_unifdef
1136 PHONY
+= headers_install_all
1137 headers_install_all
:
1138 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
install
1140 PHONY
+= headers_install
1141 headers_install
: __headers
1142 $(if
$(wildcard $(srctree
)/arch
/$(hdr-arch
)/include/uapi
/asm
/Kbuild
),, \
1143 $(error Headers not exportable for the
$(SRCARCH
) architecture
))
1144 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi
1145 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(hdr-arch
)/include/uapi
/asm
$(hdr-dst
)
1147 PHONY
+= headers_check_all
1148 headers_check_all
: headers_install_all
1149 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
check
1151 PHONY
+= headers_check
1152 headers_check
: headers_install
1153 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi HDRCHECK
=1
1154 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(hdr-arch
)/include/uapi
/asm
$(hdr-dst
) HDRCHECK
=1
1156 # ---------------------------------------------------------------------------
1161 $(Q
)$(MAKE
) -C tools
/testing
/selftests run_tests
1164 $(Q
)$(MAKE
) -C tools
/testing
/selftests
clean
1166 PHONY
+= kselftest-merge
1168 $(if
$(wildcard $(objtree
)/.config
),, $(error No .config exists
, config your kernel first
!))
1169 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/kconfig
/merge_config.sh \
1170 -m
$(objtree
)/.config \
1171 $(srctree
)/tools
/testing
/selftests
/*/config
1172 +$(Q
)$(MAKE
) -f
$(srctree
)/Makefile olddefconfig
1174 # ---------------------------------------------------------------------------
1177 ifdef CONFIG_MODULES
1179 # By default, build modules as well
1185 # A module can be listed more than once in obj-m resulting in
1186 # duplicate lines in modules.order files. Those are removed
1187 # using awk while concatenating to the final file.
1190 modules
: $(vmlinux-dirs
) $(if
$(KBUILD_BUILTIN
),vmlinux
) modules.builtin
1191 $(Q
)$(AWK
) '!x[$$0]++' $(vmlinux-dirs
:%=$(objtree
)/%/modules.order
) > $(objtree
)/modules.order
1192 @
$(kecho
) ' Building modules, stage 2.';
1193 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1194 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.fwinst obj
=firmware __fw_modbuild
1196 modules.builtin
: $(vmlinux-dirs
:%=%/modules.builtin
)
1197 $(Q
)$(AWK
) '!x[$$0]++' $^
> $(objtree
)/modules.builtin
1199 %/modules.builtin
: include/config
/auto.conf
1200 $(Q
)$(MAKE
) $(modbuiltin
)=$*
1203 # Target to prepare building external modules
1204 PHONY
+= modules_prepare
1205 modules_prepare
: prepare scripts
1207 # Target to install modules
1208 PHONY
+= modules_install
1209 modules_install
: _modinst_ _modinst_post
1213 @
rm -rf
$(MODLIB
)/kernel
1214 @
rm -f
$(MODLIB
)/source
1215 @mkdir
-p
$(MODLIB
)/kernel
1216 @ln
-s
`cd $(srctree) && /bin/pwd` $(MODLIB
)/source
1217 @if
[ ! $(objtree
) -ef
$(MODLIB
)/build
]; then \
1218 rm -f
$(MODLIB
)/build
; \
1219 ln
-s
$(CURDIR
) $(MODLIB
)/build
; \
1221 @cp
-f
$(objtree
)/modules.order
$(MODLIB
)/
1222 @cp
-f
$(objtree
)/modules.builtin
$(MODLIB
)/
1223 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1225 # This depmod is only for convenience to give the initial
1226 # boot a modules.dep even before / is mounted read-write. However the
1227 # boot script depmod is the master version.
1228 PHONY
+= _modinst_post
1229 _modinst_post
: _modinst_
1230 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.fwinst obj
=firmware __fw_modinst
1233 ifeq ($(CONFIG_MODULE_SIG
), y
)
1234 PHONY
+= modules_sign
1236 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modsign
1239 else # CONFIG_MODULES
1241 # Modules not configured
1242 # ---------------------------------------------------------------------------
1244 PHONY
+= modules modules_install
1245 modules modules_install
:
1247 @echo
>&2 "The present kernel configuration has modules disabled."
1248 @echo
>&2 "Type 'make config' and enable loadable module support."
1249 @echo
>&2 "Then build a kernel with module support enabled."
1253 endif # CONFIG_MODULES
1256 # Cleaning is done on three levels.
1257 # make clean Delete most generated files
1258 # Leave enough to build external modules
1259 # make mrproper Delete the current configuration, and all generated files
1260 # make distclean Remove editor backup files, patch leftover files and the like
1262 # Directories & files removed with 'make clean'
1263 CLEAN_DIRS
+= $(MODVERDIR
)
1265 # Directories & files removed with 'make mrproper'
1266 MRPROPER_DIRS
+= include/config usr
/include include/generated \
1267 arch
/*/include/generated .tmp_objdiff
1268 MRPROPER_FILES
+= .config .config.old .version .old_version \
1269 Module.symvers
tags TAGS cscope
* GPATH GTAGS GRTAGS GSYMS \
1270 signing_key.pem signing_key.priv signing_key.x509 \
1271 x509.genkey extra_certificates signing_key.x509.keyid \
1272 signing_key.x509.signer vmlinux-gdb.py
1274 # clean - Delete most, but leave enough to build external modules
1276 clean: rm-dirs
:= $(CLEAN_DIRS
)
1277 clean: rm-files
:= $(CLEAN_FILES
)
1278 clean-dirs
:= $(addprefix _clean_
, .
$(vmlinux-alldirs
) Documentation samples
)
1280 PHONY
+= $(clean-dirs
) clean archclean vmlinuxclean
1282 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1285 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/link-vmlinux.sh
clean
1286 $(Q
)$(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) clean)
1288 clean: archclean vmlinuxclean
1290 # mrproper - Delete all generated files, including .config
1292 mrproper
: rm-dirs
:= $(wildcard $(MRPROPER_DIRS
))
1293 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
1294 mrproper-dirs
:= $(addprefix _mrproper_
,Documentation
/DocBook scripts
)
1296 PHONY
+= $(mrproper-dirs
) mrproper archmrproper
1298 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
1300 mrproper
: clean archmrproper
$(mrproper-dirs
)
1309 @find
$(srctree
) $(RCS_FIND_IGNORE
) \
1310 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
1311 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'.*.orig' \
1312 -o
-name
'.*.rej' -o
-name
'*%' -o
-name
'core' \
) \
1313 -type f
-print | xargs
rm -f
1316 # Packaging of the kernel to various formats
1317 # ---------------------------------------------------------------------------
1318 # rpm target kept for backward compatibility
1319 package-dir
:= scripts
/package
1322 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1323 %pkg
: include/config
/kernel.release FORCE
1324 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1325 rpm
: include/config
/kernel.release FORCE
1326 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1329 # Brief documentation of the typical targets used
1330 # ---------------------------------------------------------------------------
1332 boards
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*_defconfig
)
1333 boards
:= $(sort $(notdir $(boards
)))
1334 board-dirs
:= $(dir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*/*_defconfig
))
1335 board-dirs
:= $(sort $(notdir $(board-dirs
:/=)))
1339 @echo
'Cleaning targets:'
1340 @echo
' clean - Remove most generated files but keep the config and'
1341 @echo
' enough build support to build external modules'
1342 @echo
' mrproper - Remove all generated files + config + various backup files'
1343 @echo
' distclean - mrproper + remove editor backup and patch files'
1345 @echo
'Configuration targets:'
1346 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
1348 @echo
'Other generic targets:'
1349 @echo
' all - Build all targets marked with [*]'
1350 @echo
'* vmlinux - Build the bare kernel'
1351 @echo
'* modules - Build all modules'
1352 @echo
' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1353 @echo
' firmware_install- Install all firmware to INSTALL_FW_PATH'
1354 @echo
' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1355 @echo
' dir/ - Build all files in dir and below'
1356 @echo
' dir/file.[ois] - Build specified target only'
1357 @echo
' dir/file.lst - Build specified mixed source/assembly target only'
1358 @echo
' (requires a recent binutils and recent build (System.map))'
1359 @echo
' dir/file.ko - Build module including final link'
1360 @echo
' modules_prepare - Set up for building external modules'
1361 @echo
' tags/TAGS - Generate tags file for editors'
1362 @echo
' cscope - Generate cscope index'
1363 @echo
' gtags - Generate GNU GLOBAL index'
1364 @echo
' kernelrelease - Output the release version string (use with make -s)'
1365 @echo
' kernelversion - Output the version stored in Makefile (use with make -s)'
1366 @echo
' image_name - Output the image name (use with make -s)'
1367 @echo
' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1368 echo
' (default: $(INSTALL_HDR_PATH))'; \
1370 @echo
'Static analysers'
1371 @echo
' checkstack - Generate a list of stack hogs'
1372 @echo
' namespacecheck - Name space analysis on compiled kernel'
1373 @echo
' versioncheck - Sanity check on version.h usage'
1374 @echo
' includecheck - Check for duplicate included header files'
1375 @echo
' export_report - List the usages of all exported symbols'
1376 @echo
' headers_check - Sanity check on exported headers'
1377 @echo
' headerdep - Detect inclusion cycles in headers'
1378 @
$(MAKE
) -f
$(srctree
)/scripts
/Makefile.help checker-help
1380 @echo
'Kernel selftest'
1381 @echo
' kselftest - Build and run kernel selftest (run as root)'
1382 @echo
' Build, install, and boot kernel before'
1383 @echo
' running kselftest on it'
1384 @echo
' kselftest-clean - Remove all generated kselftest files'
1385 @echo
' kselftest-merge - Merge all the config dependencies of kselftest to existed'
1388 @echo
'Kernel packaging:'
1389 @
$(MAKE
) $(build
)=$(package-dir
) help
1391 @echo
'Documentation targets:'
1392 @
$(MAKE
) -f
$(srctree
)/Documentation
/Makefile.sphinx dochelp
1394 @
$(MAKE
) -f
$(srctree
)/Documentation
/DocBook
/Makefile dochelp
1396 @echo
'Architecture specific targets ($(SRCARCH)):'
1397 @
$(if
$(archhelp
),$(archhelp
),\
1398 echo
' No architecture specific help defined for $(SRCARCH)')
1401 $(foreach b
, $(boards
), \
1402 printf
" %-24s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
1404 @
$(if
$(board-dirs
), \
1405 $(foreach b
, $(board-dirs
), \
1406 printf
" %-16s - Show %s-specific targets\\n" help-
$(b
) $(b
);) \
1407 printf
" %-16s - Show all of the above\\n" help-boards
; \
1410 @echo
' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1411 @echo
' make V=2 [targets] 2 => give reason for rebuild of target'
1412 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
1413 @echo
' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1414 @echo
' make C=2 [targets] Force check of all c source with $$CHECK'
1415 @echo
' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1416 @echo
' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1417 @echo
' 1: warnings which may be relevant and do not occur too often'
1418 @echo
' 2: warnings which occur quite often but may still be relevant'
1419 @echo
' 3: more obscure warnings, can most likely be ignored'
1420 @echo
' Multiple levels can be combined with W=12 or W=123'
1422 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
1423 @echo
'For further info see the ./README file'
1426 help-board-dirs
:= $(addprefix help-
,$(board-dirs
))
1428 help-boards
: $(help-board-dirs
)
1430 boards-per-dir
= $(sort $(notdir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/$*/*_defconfig
)))
1432 $(help-board-dirs
): help-
%:
1433 @echo
'Architecture specific targets ($(SRCARCH) $*):'
1434 @
$(if
$(boards-per-dir
), \
1435 $(foreach b
, $(boards-per-dir
), \
1436 printf
" %-24s - Build for %s\\n" $*/$(b
) $(subst _defconfig
,,$(b
));) \
1440 # Documentation targets
1441 # ---------------------------------------------------------------------------
1442 DOC_TARGETS
:= xmldocs sgmldocs psdocs latexdocs pdfdocs htmldocs mandocs installmandocs epubdocs cleandocs
1443 PHONY
+= $(DOC_TARGETS
)
1444 $(DOC_TARGETS
): scripts_basic FORCE
1445 $(Q
)$(MAKE
) $(build
)=scripts build_docproc build_check-lc_ctype
1446 $(Q
)$(MAKE
) $(build
)=Documentation
-f
$(srctree
)/Documentation
/Makefile.sphinx
$@
1447 $(Q
)$(MAKE
) $(build
)=Documentation
/DocBook
$@
1449 else # KBUILD_EXTMOD
1452 # External module support.
1453 # When building external modules the kernel used as basis is considered
1454 # read-only, and no consistency checks are made and the make
1455 # system is not used on the basis kernel. If updates are required
1456 # in the basis kernel ordinary make commands (without M=...) must
1459 # The following are the only valid targets when building external
1461 # make M=dir clean Delete all automatically generated files
1462 # make M=dir modules Make all modules in specified dir
1463 # make M=dir Same as 'make M=dir modules'
1464 # make M=dir modules_install
1465 # Install the modules built in the module directory
1466 # Assumes install directory is already created
1468 # We are always building modules
1470 PHONY
+= crmodverdir
1474 PHONY
+= $(objtree
)/Module.symvers
1475 $(objtree
)/Module.symvers
:
1476 @
test -e
$(objtree
)/Module.symvers ||
( \
1478 echo
" WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1479 echo
" is missing; modules will have no dependencies and modversions."; \
1482 module-dirs
:= $(addprefix _module_
,$(KBUILD_EXTMOD
))
1483 PHONY
+= $(module-dirs
) modules
1484 $(module-dirs
): crmodverdir
$(objtree
)/Module.symvers
1485 $(Q
)$(MAKE
) $(build
)=$(patsubst _module_
%,%,$@
)
1487 modules
: $(module-dirs
)
1488 @
$(kecho
) ' Building modules, stage 2.';
1489 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1491 PHONY
+= modules_install
1492 modules_install
: _emodinst_ _emodinst_post
1494 install-dir
:= $(if
$(INSTALL_MOD_DIR
),$(INSTALL_MOD_DIR
),extra
)
1497 $(Q
)mkdir
-p
$(MODLIB
)/$(install-dir
)
1498 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1500 PHONY
+= _emodinst_post
1501 _emodinst_post
: _emodinst_
1504 clean-dirs
:= $(addprefix _clean_
,$(KBUILD_EXTMOD
))
1506 PHONY
+= $(clean-dirs
) clean
1508 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1510 clean: rm-dirs
:= $(MODVERDIR
)
1511 clean: rm-files
:= $(KBUILD_EXTMOD
)/Module.symvers
1515 @echo
' Building external modules.'
1516 @echo
' Syntax: make -C path/to/kernel/src M=$$PWD target'
1518 @echo
' modules - default target, build the module(s)'
1519 @echo
' modules_install - install the module'
1520 @echo
' clean - remove generated files in module directory only'
1524 PHONY
+= prepare scripts
1527 endif # KBUILD_EXTMOD
1529 clean: $(clean-dirs
)
1532 @find
$(if
$(KBUILD_EXTMOD
), $(KBUILD_EXTMOD
), .
) $(RCS_FIND_IGNORE
) \
1533 \
( -name
'*.[oas]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
1537 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
1538 -o
-name
'*.symtypes' -o
-name
'modules.order' \
1539 -o
-name modules.builtin
-o
-name
'.tmp_*.o.*' \
1540 -o
-name
'*.c.[012]*.*' \
1541 -o
-name
'*.gcno' \
) -type f
-print | xargs
rm -f
1543 # Generate tags for editors
1544 # ---------------------------------------------------------------------------
1545 quiet_cmd_tags
= GEN
$@
1546 cmd_tags
= $(CONFIG_SHELL
) $(srctree
)/scripts
/tags.sh
$@
1548 tags TAGS cscope gtags
: FORCE
1551 # Scripts to check various things for consistency
1552 # ---------------------------------------------------------------------------
1554 PHONY
+= includecheck versioncheck coccicheck namespacecheck export_report
1557 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1558 -name
'*.[hcS]' -type f
-print |
sort \
1559 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkincludes.pl
1562 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1563 -name
'*.[hcS]' -type f
-print |
sort \
1564 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkversion.pl
1567 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/$@
1570 $(PERL
) $(srctree
)/scripts
/namespace.pl
1573 $(PERL
) $(srctree
)/scripts
/export_report.pl
1575 endif #ifeq ($(config-targets),1)
1576 endif #ifeq ($(mixed-targets),1)
1578 PHONY
+= checkstack kernelrelease kernelversion image_name
1580 # UML needs a little special treatment here. It wants to use the host
1581 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1582 # else wants $(ARCH), including people doing cross-builds, which means
1583 # that $(SUBARCH) doesn't work here.
1585 CHECKSTACK_ARCH
:= $(SUBARCH
)
1587 CHECKSTACK_ARCH
:= $(ARCH
)
1590 $(OBJDUMP
) -d vmlinux
$$(find .
-name
'*.ko') | \
1591 $(PERL
) $(src
)/scripts
/checkstack.pl
$(CHECKSTACK_ARCH
)
1594 @echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1597 @echo
$(KERNELVERSION
)
1600 @echo
$(KBUILD_IMAGE
)
1602 # Clear a bunch of variables before executing the submake
1604 $(Q
)mkdir
-p
$(objtree
)/tools
1605 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(filter --j% -j,$(MAKEFLAGS))" O
=$(shell cd
$(objtree
) && /bin
/pwd
) subdir
=tools
-C
$(src
)/tools
/
1608 $(Q
)mkdir
-p
$(objtree
)/tools
1609 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(filter --j% -j,$(MAKEFLAGS))" O
=$(shell cd
$(objtree
) && /bin
/pwd
) subdir
=tools
-C
$(src
)/tools
/ $*
1612 # ---------------------------------------------------------------------------
1613 # Single targets are compatible with:
1614 # - build with mixed source and output
1615 # - build with separate output dir 'make O=...'
1616 # - external modules
1618 # target-dir => where to store outputfile
1619 # build-dir => directory in kernel source tree to use
1621 ifeq ($(KBUILD_EXTMOD
),)
1622 build-dir
= $(patsubst %/,%,$(dir $@
))
1623 target-dir
= $(dir $@
)
1625 zap-slash
=$(filter-out .
,$(patsubst %/,%,$(dir $@
)))
1626 build-dir
= $(KBUILD_EXTMOD
)$(if
$(zap-slash
),/$(zap-slash
))
1627 target-dir
= $(if
$(KBUILD_EXTMOD
),$(dir $<),$(dir $@
))
1630 %.s
: %.c prepare scripts FORCE
1631 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1632 %.i
: %.c prepare scripts FORCE
1633 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1634 %.o
: %.c prepare scripts FORCE
1635 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1636 %.lst
: %.c prepare scripts FORCE
1637 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1638 %.s
: %.S prepare scripts FORCE
1639 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1640 %.o
: %.S prepare scripts FORCE
1641 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1642 %.symtypes
: %.c prepare scripts FORCE
1643 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1646 /: prepare scripts FORCE
1648 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1649 $(build
)=$(build-dir
)
1650 # Make sure the latest headers are built for Documentation
1651 Documentation
/ samples
/: headers_install
1652 %/: prepare scripts FORCE
1654 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1655 $(build
)=$(build-dir
)
1656 %.ko
: prepare scripts FORCE
1658 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1659 $(build
)=$(build-dir
) $(@
:.ko
=.o
)
1660 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1662 # FIXME Should go into a make.lib or something
1663 # ===========================================================================
1665 quiet_cmd_rmdirs
= $(if
$(wildcard $(rm-dirs
)),CLEAN
$(wildcard $(rm-dirs
)))
1666 cmd_rmdirs
= rm -rf
$(rm-dirs
)
1668 quiet_cmd_rmfiles
= $(if
$(wildcard $(rm-files
)),CLEAN
$(wildcard $(rm-files
)))
1669 cmd_rmfiles
= rm -f
$(rm-files
)
1671 # Run depmod only if we have System.map and depmod is executable
1672 quiet_cmd_depmod
= DEPMOD
$(KERNELRELEASE
)
1673 cmd_depmod
= $(CONFIG_SHELL
) $(srctree
)/scripts
/depmod.sh
$(DEPMOD
) \
1674 $(KERNELRELEASE
) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1676 # Create temporary dir for module support files
1677 # clean it up only when building all modules
1678 cmd_crmodverdir
= $(Q
)mkdir
-p
$(MODVERDIR
) \
1679 $(if
$(KBUILD_MODULES
),; rm -f
$(MODVERDIR
)/*)
1681 # read all saved command lines
1683 targets
:= $(wildcard $(sort $(targets
)))
1684 cmd_files
:= $(wildcard .
*.cmd
$(foreach f
,$(targets
),$(dir $(f
)).
$(notdir $(f
)).cmd
))
1686 ifneq ($(cmd_files
),)
1687 $(cmd_files
): ; # Do not try to update included dependency files
1688 include $(cmd_files
)
1691 endif # skip-makefile
1696 # Declare the contents of the .PHONY variable as phony. We keep that
1697 # information in a variable so we can use it in if_changed and friends.