1 # SPDX-License-Identifier: GPL-2.0
9 # To see a list of typical targets execute "make help"
10 # More info can be located in ./README
11 # Comments in this file are targeted only to the developer, do not
12 # expect to learn how to build the kernel reading this file.
14 # That's our default target when none is given on the command line
18 # We are using a recursive build, so we need to do a little thinking
19 # to get the ordering right.
21 # Most importantly: sub-Makefiles should only ever modify files in
22 # their own directory. If in some directory we have a dependency on
23 # a file in another dir (which doesn't happen often, but it's often
24 # unavoidable when linking the built-in.a targets which finally
25 # turn into vmlinux), we will call a sub make in that other dir, and
26 # after that we are sure that everything which is in that other dir
29 # The only cases where we need to modify files which have global
30 # effects are thus separated out and done before the recursive
31 # descending is started. They are now explicitly listed as the
34 ifneq ($(sub-make-done
),1)
36 # Do not use make's built-in rules and variables
37 # (this increases performance and avoids hard-to-debug behaviour)
40 # 'MAKEFLAGS += -rR' does not become immediately effective for old
41 # GNU Make versions. Cancel implicit rules for this Makefile.
42 $(lastword
$(MAKEFILE_LIST
)): ;
44 # Avoid funny character set dependencies
48 export LC_COLLATE LC_NUMERIC
50 # Avoid interference with shell env settings
54 # ---------------------------------------------------------------------------
56 # Normally, we echo the whole command before executing it. By making
57 # that echo $($(quiet)$(cmd)), we now have the possibility to set
58 # $(quiet) to choose other forms of output instead, e.g.
60 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
61 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
63 # If $(quiet) is empty, the whole command will be printed.
64 # If it is set to "quiet_", only the short version will be printed.
65 # If it is set to "silent_", nothing will be printed at all, since
66 # the variable $(silent_cmd_cc_o_c) doesn't exist.
68 # A simple variant is to prefix commands with $(Q) - that's useful
69 # for commands that shall be hidden in non-verbose mode.
73 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
74 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
76 # To put more focus on warnings, be less verbose as default
77 # Use 'make V=1' to see the full commands
79 ifeq ("$(origin V)", "command line")
86 ifeq ($(KBUILD_VERBOSE
),1)
94 # If the user is running make -s (silent mode), suppress echoing of
97 ifneq ($(findstring s
,$(filter-out --%,$(MAKEFLAGS
))),)
101 export quiet Q KBUILD_VERBOSE
103 # kbuild supports saving output files in a separate directory.
104 # To locate output files in a separate directory two syntaxes are supported.
105 # In both cases the working directory must be the root of the kernel src.
107 # Use "make O=dir/to/store/output/files/"
109 # 2) Set KBUILD_OUTPUT
110 # Set the environment variable KBUILD_OUTPUT to point to the directory
111 # where the output files shall be placed.
112 # export KBUILD_OUTPUT=dir/to/store/output/files/
115 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
118 # KBUILD_SRC is not intended to be used by the regular user (for now),
119 # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
121 # OK, Make called in directory where kernel src resides
122 # Do we want to locate output files in a separate directory?
123 ifeq ("$(origin O)", "command line")
124 KBUILD_OUTPUT
:= $(O
)
127 ifneq ($(words $(subst :, ,$(CURDIR
))), 1)
128 $(error main directory cannot contain spaces nor colons
)
131 ifneq ($(KBUILD_OUTPUT
),)
132 # check that the output directory actually exists
133 saved-output
:= $(KBUILD_OUTPUT
)
134 KBUILD_OUTPUT
:= $(shell mkdir
-p
$(KBUILD_OUTPUT
) && cd
$(KBUILD_OUTPUT
) \
136 $(if
$(KBUILD_OUTPUT
),, \
137 $(error failed to create output directory
"$(saved-output)"))
139 # Look for make include files relative to root of kernel src
141 # This does not become effective immediately because MAKEFLAGS is re-parsed
142 # once after the Makefile is read. It is OK since we are going to invoke
144 MAKEFLAGS
+= --include-dir
=$(CURDIR
)
148 # Do not print "Entering directory ..." at all for in-tree build.
149 MAKEFLAGS
+= --no-print-directory
151 endif # ifneq ($(KBUILD_OUTPUT),)
153 PHONY
+= $(MAKECMDGOALS
) sub-make
155 $(filter-out _all sub-make
$(CURDIR
)/Makefile
, $(MAKECMDGOALS
)) _all
: sub-make
158 # Invoke a second make in the output directory, passing relevant variables
160 $(Q
)$(MAKE
) sub-make-done
=1 \
161 $(if
$(KBUILD_OUTPUT
),-C
$(KBUILD_OUTPUT
) KBUILD_SRC
=$(CURDIR
)) \
162 -f
$(CURDIR
)/Makefile
$(filter-out _all sub-make
,$(MAKECMDGOALS
))
165 # We process the rest of the Makefile if this is the final invocation of make
167 # Do not print "Entering directory ...",
168 # but we want to display it when entering to the output directory
169 # so that IDEs/editors are able to understand relative filenames.
170 MAKEFLAGS
+= --no-print-directory
172 # Call a source code checker (by default, "sparse") as part of the
175 # Use 'make C=1' to enable checking of only re-compiled files.
176 # Use 'make C=2' to enable checking of *all* source files, regardless
177 # of whether they are re-compiled or not.
179 # See the file "Documentation/dev-tools/sparse.rst" for more details,
180 # including where to get the "sparse" utility.
182 ifeq ("$(origin C)", "command line")
183 KBUILD_CHECKSRC
= $(C
)
185 ifndef KBUILD_CHECKSRC
189 # Use make M=dir to specify directory of external module to build
190 # Old syntax make ... SUBDIRS=$PWD is still supported
191 # Setting the environment variable KBUILD_EXTMOD take precedence
193 $(warning
================= WARNING
================)
194 $(warning
'SUBDIRS' will be removed after Linux
5.3)
195 $(warning Please use
'M=' or
'KBUILD_EXTMOD' instead
)
196 $(warning
==========================================)
197 KBUILD_EXTMOD ?
= $(SUBDIRS
)
200 ifeq ("$(origin M)", "command line")
201 KBUILD_EXTMOD
:= $(M
)
204 ifeq ($(KBUILD_SRC
),)
205 # building in the source tree
208 ifeq ($(KBUILD_SRC
)/,$(dir $(CURDIR
)))
209 # building in a subdirectory of the source tree
212 srctree
:= $(KBUILD_SRC
)
216 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
224 export srctree objtree VPATH
226 # To make sure we do not include .config for any of the *config targets
227 # catch them early, and hand them over to scripts/kconfig/Makefile
228 # It is allowed to specify more targets when calling make, including
229 # mixing *config targets and build targets.
230 # For example 'make oldconfig all'.
231 # Detect when mixed targets is specified, and make a second invocation
232 # of make so .config is not included in this case either (for *config).
234 version_h
:= include/generated
/uapi
/linux
/version.h
235 old_version_h
:= include/linux
/version.h
237 clean-targets
:= %clean mrproper cleandocs
238 no-dot-config-targets
:= $(clean-targets
) \
239 cscope gtags TAGS
tags help
% %docs
check% coccicheck \
240 $(version_h
) headers_
% archheaders archscripts \
241 %asm-generic kernelversion
%src-pkg
242 no-sync-config-targets
:= $(no-dot-config-targets
) install %install \
250 ifneq ($(filter $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
251 ifeq ($(filter-out $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
256 ifneq ($(filter $(no-sync-config-targets
), $(MAKECMDGOALS
)),)
257 ifeq ($(filter-out $(no-sync-config-targets
), $(MAKECMDGOALS
)),)
262 ifneq ($(KBUILD_EXTMOD
),)
266 ifeq ($(KBUILD_EXTMOD
),)
267 ifneq ($(filter config
%config
,$(MAKECMDGOALS
)),)
269 ifneq ($(words $(MAKECMDGOALS
)),1)
275 # For "make -j clean all", "make -j mrproper defconfig all", etc.
276 ifneq ($(filter $(clean-targets
),$(MAKECMDGOALS
)),)
277 ifneq ($(filter-out $(clean-targets
),$(MAKECMDGOALS
)),)
282 # install and modules_install need also be processed one by one
283 ifneq ($(filter install,$(MAKECMDGOALS
)),)
284 ifneq ($(filter modules_install
,$(MAKECMDGOALS
)),)
289 ifeq ($(mixed-targets
),1)
290 # ===========================================================================
291 # We're called with mixed targets (*config and build targets).
292 # Handle them one by one.
294 PHONY
+= $(MAKECMDGOALS
) __build_one_by_one
296 $(filter-out __build_one_by_one
, $(MAKECMDGOALS
)): __build_one_by_one
301 for i in
$(MAKECMDGOALS
); do \
302 $(MAKE
) -f
$(srctree
)/Makefile
$$i; \
307 include scripts
/Kbuild.
include
309 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
310 KERNELRELEASE
= $(shell cat
include/config
/kernel.release
2> /dev
/null
)
311 KERNELVERSION
= $(VERSION
)$(if
$(PATCHLEVEL
),.
$(PATCHLEVEL
)$(if
$(SUBLEVEL
),.
$(SUBLEVEL
)))$(EXTRAVERSION
)
312 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
314 include scripts
/subarch.
include
316 # Cross compiling and selecting different set of gcc/bin-utils
317 # ---------------------------------------------------------------------------
319 # When performing cross compilation for other architectures ARCH shall be set
320 # to the target architecture. (See arch/* for the possibilities).
321 # ARCH can be set during invocation of make:
323 # Another way is to have ARCH set in the environment.
324 # The default ARCH is the host where make is executed.
326 # CROSS_COMPILE specify the prefix used for all executables used
327 # during compilation. Only gcc and related bin-utils executables
328 # are prefixed with $(CROSS_COMPILE).
329 # CROSS_COMPILE can be set on the command line
330 # make CROSS_COMPILE=ia64-linux-
331 # Alternatively CROSS_COMPILE can be set in the environment.
332 # Default value for CROSS_COMPILE is not to prefix executables
333 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
336 # Architecture as present in compile.h
337 UTS_MACHINE
:= $(ARCH
)
340 # Additional ARCH settings for x86
344 ifeq ($(ARCH
),x86_64
)
348 # Additional ARCH settings for sparc
349 ifeq ($(ARCH
),sparc32
)
352 ifeq ($(ARCH
),sparc64
)
356 # Additional ARCH settings for sh
361 KCONFIG_CONFIG ?
= .config
362 export KCONFIG_CONFIG
364 # SHELL used by kbuild
365 CONFIG_SHELL
:= $(shell if
[ -x
"$$BASH" ]; then echo
$$BASH; \
366 else if
[ -x
/bin
/bash
]; then echo
/bin
/bash
; \
367 else echo sh
; fi
; fi
)
369 HOST_LFS_CFLAGS
:= $(shell getconf LFS_CFLAGS
2>/dev
/null
)
370 HOST_LFS_LDFLAGS
:= $(shell getconf LFS_LDFLAGS
2>/dev
/null
)
371 HOST_LFS_LIBS
:= $(shell getconf LFS_LIBS
2>/dev
/null
)
375 KBUILD_HOSTCFLAGS
:= -Wall
-Wmissing-prototypes
-Wstrict-prototypes
-O2 \
376 -fomit-frame-pointer
-std
=gnu89
$(HOST_LFS_CFLAGS
) \
378 KBUILD_HOSTCXXFLAGS
:= -O2
$(HOST_LFS_CFLAGS
) $(HOSTCXXFLAGS
)
379 KBUILD_HOSTLDFLAGS
:= $(HOST_LFS_LDFLAGS
) $(HOSTLDFLAGS
)
380 KBUILD_HOSTLDLIBS
:= $(HOST_LFS_LIBS
) $(HOSTLDLIBS
)
382 # Make variables (CC, etc...)
383 AS
= $(CROSS_COMPILE
)as
384 LD
= $(CROSS_COMPILE
)ld
385 CC
= $(CROSS_COMPILE
)gcc
387 AR
= $(CROSS_COMPILE
)ar
388 NM
= $(CROSS_COMPILE
)nm
389 STRIP
= $(CROSS_COMPILE
)strip
390 OBJCOPY
= $(CROSS_COMPILE
)objcopy
391 OBJDUMP
= $(CROSS_COMPILE
)objdump
395 INSTALLKERNEL
:= installkernel
396 DEPMOD
= /sbin
/depmod
403 CHECKFLAGS
:= -D__linux__
-Dlinux
-D__STDC__
-Dunix
-D__unix__ \
404 -Wbitwise
-Wno-return-void
-Wno-unknown-attribute
$(CF
)
413 # Use USERINCLUDE when you must reference the UAPI directories only.
415 -I
$(srctree
)/arch
/$(SRCARCH
)/include/uapi \
416 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated
/uapi \
417 -I
$(srctree
)/include/uapi \
418 -I
$(objtree
)/include/generated
/uapi \
419 -include $(srctree
)/include/linux
/kconfig.h
421 # Use LINUXINCLUDE when you must reference the include/ directory.
422 # Needed to be compatible with the O= option
424 -I
$(srctree
)/arch
/$(SRCARCH
)/include \
425 -I
$(objtree
)/arch
/$(SRCARCH
)/include/generated \
426 $(if
$(KBUILD_SRC
), -I
$(srctree
)/include) \
427 -I
$(objtree
)/include \
430 KBUILD_AFLAGS
:= -D__ASSEMBLY__
-fno-PIE
431 KBUILD_CFLAGS
:= -Wall
-Wundef
-Werror
=strict-prototypes
-Wno-trigraphs \
432 -fno-strict-aliasing
-fno-common
-fshort-wchar
-fno-PIE \
433 -Werror
=implicit-function-declaration
-Werror
=implicit-int \
434 -Wno-format-security \
436 KBUILD_CPPFLAGS
:= -D__KERNEL__
437 KBUILD_AFLAGS_KERNEL
:=
438 KBUILD_CFLAGS_KERNEL
:=
439 KBUILD_AFLAGS_MODULE
:= -DMODULE
440 KBUILD_CFLAGS_MODULE
:= -DMODULE
441 KBUILD_LDFLAGS_MODULE
:= -T
$(srctree
)/scripts
/module-common.lds
443 GCC_PLUGINS_CFLAGS
:=
445 export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
446 export CPP AR NM STRIP OBJCOPY OBJDUMP KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
447 export MAKE LEX YACC AWK INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
448 export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
450 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
451 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
452 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
453 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
454 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
455 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
456 export KBUILD_ARFLAGS
458 # When compiling out-of-tree modules, put MODVERDIR in the module
459 # tree rather than in the kernel tree. The kernel tree might
461 export MODVERDIR
:= $(if
$(KBUILD_EXTMOD
),$(firstword $(KBUILD_EXTMOD
))/).tmp_versions
463 # Files to ignore in find ... statements
465 export RCS_FIND_IGNORE
:= \
( -name SCCS
-o
-name BitKeeper
-o
-name .svn
-o \
466 -name CVS
-o
-name .
pc -o
-name .hg
-o
-name .git \
) \
468 export RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn \
469 --exclude CVS
--exclude .
pc --exclude .hg
--exclude .git
471 # ===========================================================================
472 # Rules shared between *config targets and build targets
474 # Basic helpers built in scripts/basic/
475 PHONY
+= scripts_basic
477 $(Q
)$(MAKE
) $(build
)=scripts
/basic
478 $(Q
)rm -f .tmp_quiet_recordmcount
480 PHONY
+= outputmakefile
481 # outputmakefile generates a Makefile in the output directory, if using a
482 # separate output directory. This allows convenient use of make in the
484 # At the same time when output Makefile generated, generate .gitignore to
485 # ignore whole output directory
487 ifneq ($(KBUILD_SRC
),)
488 $(Q
)ln
-fsn
$(srctree
) source
489 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/mkmakefile
$(srctree
)
490 $(Q
){ echo
"# this is build directory, ignore it"; echo
"*"; } > .gitignore
493 ifneq ($(shell $(CC
) --version
2>&1 | head
-n
1 | grep clang
),)
494 ifneq ($(CROSS_COMPILE
),)
495 CLANG_FLAGS
:= --target
=$(notdir $(CROSS_COMPILE
:%-=%))
496 GCC_TOOLCHAIN_DIR
:= $(dir $(shell which
$(CROSS_COMPILE
)elfedit
))
497 CLANG_FLAGS
+= --prefix=$(GCC_TOOLCHAIN_DIR
)
498 GCC_TOOLCHAIN
:= $(realpath
$(GCC_TOOLCHAIN_DIR
)/..
)
500 ifneq ($(GCC_TOOLCHAIN
),)
501 CLANG_FLAGS
+= --gcc-toolchain
=$(GCC_TOOLCHAIN
)
503 CLANG_FLAGS
+= -no-integrated-as
504 KBUILD_CFLAGS
+= $(CLANG_FLAGS
)
505 KBUILD_AFLAGS
+= $(CLANG_FLAGS
)
509 RETPOLINE_CFLAGS_GCC
:= -mindirect-branch
=thunk-extern
-mindirect-branch-register
510 RETPOLINE_VDSO_CFLAGS_GCC
:= -mindirect-branch
=thunk-inline
-mindirect-branch-register
511 RETPOLINE_CFLAGS_CLANG
:= -mretpoline-external-thunk
512 RETPOLINE_VDSO_CFLAGS_CLANG
:= -mretpoline
513 RETPOLINE_CFLAGS
:= $(call cc-option
,$(RETPOLINE_CFLAGS_GCC
),$(call cc-option
,$(RETPOLINE_CFLAGS_CLANG
)))
514 RETPOLINE_VDSO_CFLAGS
:= $(call cc-option
,$(RETPOLINE_VDSO_CFLAGS_GCC
),$(call cc-option
,$(RETPOLINE_VDSO_CFLAGS_CLANG
)))
515 export RETPOLINE_CFLAGS
516 export RETPOLINE_VDSO_CFLAGS
518 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
519 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
520 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
521 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
522 CC_VERSION_TEXT
= $(shell $(CC
) --version | head
-n
1)
524 ifeq ($(config-targets
),1)
525 # ===========================================================================
526 # *config targets only - make sure prerequisites are updated, and descend
527 # in scripts/kconfig to make the *config target
529 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
530 # KBUILD_DEFCONFIG may point out an alternative default configuration
531 # used for 'make defconfig'
532 include arch
/$(SRCARCH
)/Makefile
533 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
535 config
: scripts_basic outputmakefile FORCE
536 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
538 %config
: scripts_basic outputmakefile FORCE
539 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
542 # ===========================================================================
543 # Build targets only - this includes vmlinux, arch specific targets, clean
544 # targets and others. In general all targets except *config targets.
546 # If building an external module we do not care about the all: rule
547 # but instead _all depend on modules
549 ifeq ($(KBUILD_EXTMOD
),)
555 # Decide whether to build built-in, modular, or both.
556 # Normally, just do built-in.
561 # If we have only "make modules", don't compile built-in objects.
562 # When we're building modules with modversions, we need to consider
563 # the built-in objects during the descend as well, in order to
564 # make sure the checksums are up to date before we record them.
566 ifeq ($(MAKECMDGOALS
),modules
)
567 KBUILD_BUILTIN
:= $(if
$(CONFIG_MODVERSIONS
),1)
570 # If we have "make <whatever> modules", compile modules
571 # in addition to whatever we do anyway.
572 # Just "make" or "make all" shall build modules as well
574 ifneq ($(filter all _all modules
,$(MAKECMDGOALS
)),)
578 ifeq ($(MAKECMDGOALS
),)
582 export KBUILD_MODULES KBUILD_BUILTIN
584 ifeq ($(KBUILD_EXTMOD
),)
585 # Objects we will link into vmlinux / subdirs we need to visit
587 drivers-y
:= drivers
/ sound
/
592 endif # KBUILD_EXTMOD
594 ifeq ($(dot-config
),1)
595 include include/config
/auto.conf
598 # The all: target is the default when no target is given on the
600 # This allow a user to issue only 'make' to build a kernel including modules
601 # Defaults to vmlinux, but the arch makefile usually adds further targets
604 CFLAGS_GCOV
:= -fprofile-arcs
-ftest-coverage \
605 $(call cc-option
,-fno-tree-loop-im
) \
606 $(call cc-disable-warning
,maybe-uninitialized
,)
609 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
610 ifdef CONFIG_FUNCTION_TRACER
611 CC_FLAGS_FTRACE
:= -pg
614 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
615 # values of the respective KBUILD_* variables
619 include arch
/$(SRCARCH
)/Makefile
621 ifeq ($(dot-config
),1)
622 ifeq ($(may-sync-config
),1)
623 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
624 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
625 # because some architectures define CROSS_COMPILE there.
626 -include include/config
/auto.conf.cmd
630 @echo
>&2 '*** Configuration file "$@" not found!'
632 @echo
>&2 '*** Please run some configurator (e.g. "make oldconfig" or'
633 @echo
>&2 '*** "make menuconfig" or "make xconfig").'
637 # The actual configuration files used during the build are stored in
638 # include/generated/ and include/config/. Update them if .config is newer than
639 # include/config/auto.conf (which mirrors .config).
641 # This exploits the 'multi-target pattern rule' trick.
642 # The syncconfig should be executed only once to make all the targets.
643 %/auto.conf
%/auto.conf.cmd
%/tristate.conf
: $(KCONFIG_CONFIG
)
644 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile syncconfig
646 # External modules and some install targets need include/generated/autoconf.h
647 # and include/config/auto.conf but do not care if they are up-to-date.
648 # Use auto.conf to trigger the test
649 PHONY
+= include/config
/auto.conf
651 include/config
/auto.conf
:
652 $(Q
)test -e
include/generated
/autoconf.h
-a
-e
$@ ||
( \
654 echo
>&2 " ERROR: Kernel configuration is invalid."; \
655 echo
>&2 " include/generated/autoconf.h or $@ are missing.";\
656 echo
>&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
660 endif # may-sync-config
661 endif # $(dot-config)
663 KBUILD_CFLAGS
+= $(call cc-option
,-fno-delete-null-pointer-checks
,)
664 KBUILD_CFLAGS
+= $(call cc-disable-warning
,frame-address
,)
665 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-truncation
)
666 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-overflow
)
667 KBUILD_CFLAGS
+= $(call cc-disable-warning
, int-in-bool-context
)
669 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
670 KBUILD_CFLAGS
+= $(call cc-option
,-Oz
,-Os
)
675 ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
676 KBUILD_CFLAGS
+= -Wno-maybe-uninitialized
679 # Tell gcc to never replace conditional load with a non-conditional one
680 KBUILD_CFLAGS
+= $(call cc-option
,--param
=allow-store-data-races
=0)
682 include scripts
/Makefile.kcov
683 include scripts
/Makefile.gcc-plugins
685 ifdef CONFIG_READABLE_ASM
686 # Disable optimizations that make assembler listings hard to read.
687 # reorder blocks reorders the control in the function
688 # ipa clone creates specialized cloned functions
689 # partial inlining inlines only parts of functions
690 KBUILD_CFLAGS
+= $(call cc-option
,-fno-reorder-blocks
,) \
691 $(call cc-option
,-fno-ipa-cp-clone
,) \
692 $(call cc-option
,-fno-partial-inlining
)
695 ifneq ($(CONFIG_FRAME_WARN
),0)
696 KBUILD_CFLAGS
+= $(call cc-option
,-Wframe-larger-than
=${CONFIG_FRAME_WARN})
699 stackp-flags-
$(CONFIG_CC_HAS_STACKPROTECTOR_NONE
) := -fno-stack-protector
700 stackp-flags-
$(CONFIG_STACKPROTECTOR
) := -fstack-protector
701 stackp-flags-
$(CONFIG_STACKPROTECTOR_STRONG
) := -fstack-protector-strong
703 KBUILD_CFLAGS
+= $(stackp-flags-y
)
705 ifdef CONFIG_CC_IS_CLANG
706 KBUILD_CPPFLAGS
+= $(call cc-option
,-Qunused-arguments
,)
707 KBUILD_CFLAGS
+= $(call cc-disable-warning
, format-invalid-specifier
)
708 KBUILD_CFLAGS
+= $(call cc-disable-warning
, gnu
)
709 KBUILD_CFLAGS
+= $(call cc-disable-warning
, address-of-packed-member
)
710 # Quiet clang warning: comparison of unsigned expression < 0 is always false
711 KBUILD_CFLAGS
+= $(call cc-disable-warning
, tautological-compare
)
712 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
713 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
714 # See modpost pattern 2
715 KBUILD_CFLAGS
+= $(call cc-option
, -mno-global-merge
,)
716 KBUILD_CFLAGS
+= $(call cc-option
, -fcatch-undefined-behavior
)
719 # These warnings generated too much noise in a regular build.
720 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
721 KBUILD_CFLAGS
+= -Wno-unused-but-set-variable
724 KBUILD_CFLAGS
+= $(call cc-disable-warning
, unused-const-variable
)
725 ifdef CONFIG_FRAME_POINTER
726 KBUILD_CFLAGS
+= -fno-omit-frame-pointer
-fno-optimize-sibling-calls
728 # Some targets (ARM with Thumb2, for example), can't be built with frame
729 # pointers. For those, we don't have FUNCTION_TRACER automatically
730 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
731 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
732 # -fomit-frame-pointer with FUNCTION_TRACER.
733 ifndef CONFIG_FUNCTION_TRACER
734 KBUILD_CFLAGS
+= -fomit-frame-pointer
738 DEBUG_CFLAGS
:= $(call cc-option
, -fno-var-tracking-assignments
)
740 ifdef CONFIG_DEBUG_INFO
741 ifdef CONFIG_DEBUG_INFO_SPLIT
742 DEBUG_CFLAGS
+= -gsplit-dwarf
746 KBUILD_AFLAGS
+= -Wa
,-gdwarf-2
748 ifdef CONFIG_DEBUG_INFO_DWARF4
749 DEBUG_CFLAGS
+= -gdwarf-4
752 ifdef CONFIG_DEBUG_INFO_REDUCED
753 DEBUG_CFLAGS
+= $(call cc-option
, -femit-struct-debug-baseonly
) \
754 $(call cc-option
,-fno-var-tracking
)
757 KBUILD_CFLAGS
+= $(DEBUG_CFLAGS
)
760 ifdef CONFIG_FUNCTION_TRACER
761 ifdef CONFIG_FTRACE_MCOUNT_RECORD
762 # gcc 5 supports generating the mcount tables directly
763 ifeq ($(call cc-option-yn
,-mrecord-mcount
),y
)
764 CC_FLAGS_FTRACE
+= -mrecord-mcount
765 export CC_USING_RECORD_MCOUNT
:= 1
767 ifdef CONFIG_HAVE_NOP_MCOUNT
768 ifeq ($(call cc-option-yn
, -mnop-mcount
),y
)
769 CC_FLAGS_FTRACE
+= -mnop-mcount
770 CC_FLAGS_USING
+= -DCC_USING_NOP_MCOUNT
774 ifdef CONFIG_HAVE_FENTRY
775 ifeq ($(call cc-option-yn
, -mfentry
),y
)
776 CC_FLAGS_FTRACE
+= -mfentry
777 CC_FLAGS_USING
+= -DCC_USING_FENTRY
780 export CC_FLAGS_FTRACE
781 KBUILD_CFLAGS
+= $(CC_FLAGS_FTRACE
) $(CC_FLAGS_USING
)
782 KBUILD_AFLAGS
+= $(CC_FLAGS_USING
)
783 ifdef CONFIG_DYNAMIC_FTRACE
784 ifdef CONFIG_HAVE_C_RECORDMCOUNT
785 BUILD_C_RECORDMCOUNT
:= y
786 export BUILD_C_RECORDMCOUNT
791 # We trigger additional mismatches with less inlining
792 ifdef CONFIG_DEBUG_SECTION_MISMATCH
793 KBUILD_CFLAGS
+= $(call cc-option
, -fno-inline-functions-called-once
)
796 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
797 KBUILD_CFLAGS_KERNEL
+= -ffunction-sections
-fdata-sections
798 LDFLAGS_vmlinux
+= --gc-sections
801 # arch Makefile may override CC so keep this after arch Makefile is included
802 NOSTDINC_FLAGS
+= -nostdinc
-isystem
$(shell $(CC
) -print-file-name
=include)
804 # warn about C99 declaration after statement
805 KBUILD_CFLAGS
+= -Wdeclaration-after-statement
807 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
808 KBUILD_CFLAGS
+= $(call cc-option
,-Wvla
)
810 # disable pointer signed / unsigned warnings in gcc 4.0
811 KBUILD_CFLAGS
+= -Wno-pointer-sign
813 # disable stringop warnings in gcc 8+
814 KBUILD_CFLAGS
+= $(call cc-disable-warning
, stringop-truncation
)
816 # disable invalid "can't wrap" optimizations for signed / pointers
817 KBUILD_CFLAGS
+= $(call cc-option
,-fno-strict-overflow
)
819 # clang sets -fmerge-all-constants by default as optimization, but this
820 # is non-conforming behavior for C and in fact breaks the kernel, so we
821 # need to disable it here generally.
822 KBUILD_CFLAGS
+= $(call cc-option
,-fno-merge-all-constants
)
824 # for gcc -fno-merge-all-constants disables everything, but it is fine
825 # to have actual conforming behavior enabled.
826 KBUILD_CFLAGS
+= $(call cc-option
,-fmerge-constants
)
828 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
829 KBUILD_CFLAGS
+= $(call cc-option
,-fno-stack-check
,)
831 # conserve stack if available
832 KBUILD_CFLAGS
+= $(call cc-option
,-fconserve-stack
)
834 # Prohibit date/time macros, which would make the build non-deterministic
835 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=date-time
)
837 # enforce correct pointer usage
838 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=incompatible-pointer-types
)
840 # Require designated initializers for all marked structures
841 KBUILD_CFLAGS
+= $(call cc-option
,-Werror
=designated-init
)
843 # change __FILE__ to the relative path from the srctree
844 KBUILD_CFLAGS
+= $(call cc-option
,-fmacro-prefix-map
=$(srctree
)/=)
846 # use the deterministic mode of AR if available
847 KBUILD_ARFLAGS
:= $(call ar-option
,D
)
849 include scripts
/Makefile.kasan
850 include scripts
/Makefile.extrawarn
851 include scripts
/Makefile.ubsan
853 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
855 KBUILD_CPPFLAGS
+= $(ARCH_CPPFLAGS
) $(KCPPFLAGS
)
856 KBUILD_AFLAGS
+= $(ARCH_AFLAGS
) $(KAFLAGS
)
857 KBUILD_CFLAGS
+= $(ARCH_CFLAGS
) $(KCFLAGS
)
859 # Use --build-id when available.
860 LDFLAGS_BUILD_ID
:= $(call ld-option
, --build-id
)
861 KBUILD_LDFLAGS_MODULE
+= $(LDFLAGS_BUILD_ID
)
862 LDFLAGS_vmlinux
+= $(LDFLAGS_BUILD_ID
)
864 ifeq ($(CONFIG_STRIP_ASM_SYMS
),y
)
865 LDFLAGS_vmlinux
+= $(call ld-option
, -X
,)
868 # insure the checker run with the right endianness
869 CHECKFLAGS
+= $(if
$(CONFIG_CPU_BIG_ENDIAN
),-mbig-endian
,-mlittle-endian
)
871 # the checker needs the correct machine size
872 CHECKFLAGS
+= $(if
$(CONFIG_64BIT
),-m64
,-m32
)
874 # Default kernel image to build when no specific target is given.
875 # KBUILD_IMAGE may be overruled on the command line or
876 # set in the environment
877 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
879 export KBUILD_IMAGE ?
= vmlinux
882 # INSTALL_PATH specifies where to place the updated kernel and system map
883 # images. Default is /boot, but you can set it to other values
884 export INSTALL_PATH ?
= /boot
887 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
888 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
889 # an argument if needed. Otherwise it defaults to the kernel install path
891 export INSTALL_DTBS_PATH ?
= $(INSTALL_PATH
)/dtbs
/$(KERNELRELEASE
)
894 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
895 # relocations required by build roots. This is not defined in the
896 # makefile but the argument can be passed to make if needed.
899 MODLIB
= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
903 # INSTALL_MOD_STRIP, if defined, will cause modules to be
904 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
905 # the default option --strip-debug will be used. Otherwise,
906 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
908 ifdef INSTALL_MOD_STRIP
909 ifeq ($(INSTALL_MOD_STRIP
),1)
910 mod_strip_cmd
= $(STRIP
) --strip-debug
912 mod_strip_cmd
= $(STRIP
) $(INSTALL_MOD_STRIP
)
913 endif # INSTALL_MOD_STRIP=1
916 endif # INSTALL_MOD_STRIP
919 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
920 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
921 # or CONFIG_MODULE_COMPRESS_XZ.
923 mod_compress_cmd
= true
924 ifdef CONFIG_MODULE_COMPRESS
925 ifdef CONFIG_MODULE_COMPRESS_GZIP
926 mod_compress_cmd
= gzip
-n
-f
927 endif # CONFIG_MODULE_COMPRESS_GZIP
928 ifdef CONFIG_MODULE_COMPRESS_XZ
929 mod_compress_cmd
= xz
-f
930 endif # CONFIG_MODULE_COMPRESS_XZ
931 endif # CONFIG_MODULE_COMPRESS
932 export mod_compress_cmd
934 ifdef CONFIG_MODULE_SIG_ALL
935 $(eval
$(call config_filename
,MODULE_SIG_KEY
))
937 mod_sign_cmd
= scripts
/sign-file
$(CONFIG_MODULE_SIG_HASH
) $(MODULE_SIG_KEY_SRCPREFIX
)$(CONFIG_MODULE_SIG_KEY
) certs
/signing_key.x509
943 ifdef CONFIG_STACK_VALIDATION
944 has_libelf
:= $(call try-run
,\
945 echo
"int main() {}" |
$(HOSTCC
) -xc
-o
/dev
/null
-lelf
-,1,0)
946 ifeq ($(has_libelf
),1)
947 objtool_target
:= tools
/objtool FORCE
949 SKIP_STACK_VALIDATION
:= 1
950 export SKIP_STACK_VALIDATION
956 ifeq ($(KBUILD_EXTMOD
),)
957 core-y
+= kernel
/ certs
/ mm
/ fs
/ ipc
/ security
/ crypto
/ block
/
959 vmlinux-dirs
:= $(patsubst %/,%,$(filter %/, $(init-y
) $(init-m
) \
960 $(core-y
) $(core-m
) $(drivers-y
) $(drivers-m
) \
961 $(net-y
) $(net-m
) $(libs-y
) $(libs-m
) $(virt-y
)))
963 vmlinux-alldirs
:= $(sort $(vmlinux-dirs
) $(patsubst %/,%,$(filter %/, \
964 $(init-
) $(core-
) $(drivers-
) $(net-
) $(libs-
) $(virt-
))))
966 init-y
:= $(patsubst %/, %/built-in.a
, $(init-y
))
967 core-y
:= $(patsubst %/, %/built-in.a
, $(core-y
))
968 drivers-y
:= $(patsubst %/, %/built-in.a
, $(drivers-y
))
969 net-y
:= $(patsubst %/, %/built-in.a
, $(net-y
))
970 libs-y1
:= $(patsubst %/, %/lib.a
, $(libs-y
))
971 libs-y2
:= $(patsubst %/, %/built-in.a
, $(filter-out %.a
, $(libs-y
)))
972 virt-y
:= $(patsubst %/, %/built-in.a
, $(virt-y
))
974 # Externally visible symbols (used by link-vmlinux.sh)
975 export KBUILD_VMLINUX_OBJS
:= $(head-y
) $(init-y
) $(core-y
) $(libs-y2
) \
976 $(drivers-y
) $(net-y
) $(virt-y
)
977 export KBUILD_VMLINUX_LIBS
:= $(libs-y1
)
978 export KBUILD_LDS
:= arch
/$(SRCARCH
)/kernel
/vmlinux.lds
979 export LDFLAGS_vmlinux
980 # used by scripts/package/Makefile
981 export KBUILD_ALLDIRS
:= $(sort $(filter-out arch
/%,$(vmlinux-alldirs
)) arch Documentation
include samples scripts tools
)
983 vmlinux-deps
:= $(KBUILD_LDS
) $(KBUILD_VMLINUX_OBJS
) $(KBUILD_VMLINUX_LIBS
)
985 # Recurse until adjust_autoksyms.sh is satisfied
986 PHONY
+= autoksyms_recursive
987 autoksyms_recursive
: $(vmlinux-deps
)
988 ifdef CONFIG_TRIM_UNUSED_KSYMS
989 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/adjust_autoksyms.sh \
990 "$(MAKE) -f $(srctree)/Makefile vmlinux"
993 # For the kernel to actually contain only the needed exported symbols,
994 # we have to build modules as well to determine what those symbols are.
995 # (this can be evaluated only once include/config/auto.conf has been included)
996 ifdef CONFIG_TRIM_UNUSED_KSYMS
1000 autoksyms_h
:= $(if
$(CONFIG_TRIM_UNUSED_KSYMS
), include/generated
/autoksyms.h
)
1003 $(Q
)mkdir
-p
$(dir $@
)
1006 ARCH_POSTLINK
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/Makefile.postlink
)
1008 # Final link of vmlinux with optional arch pass after final link
1009 cmd_link-vmlinux
= \
1010 $(CONFIG_SHELL
) $< $(LD
) $(KBUILD_LDFLAGS
) $(LDFLAGS_vmlinux
) ; \
1011 $(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) $@
, true
)
1013 vmlinux
: scripts
/link-vmlinux.sh autoksyms_recursive
$(vmlinux-deps
) FORCE
1014 +$(call if_changed
,link-vmlinux
)
1018 # Build samples along the rest of the kernel. This needs headers_install.
1019 ifdef CONFIG_SAMPLES
1020 vmlinux-dirs
+= samples
1021 samples
: headers_install
1024 # The actual objects are generated when descending,
1025 # make sure no implicit rule kicks in
1026 $(sort $(vmlinux-deps
)): $(vmlinux-dirs
) ;
1028 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1029 # Preset locale variables to speed up the build process. Limit locale
1030 # tweaks to this spot to avoid wrong language settings when running
1031 # make menuconfig etc.
1032 # Error messages still appears in the original language
1034 PHONY
+= $(vmlinux-dirs
)
1035 $(vmlinux-dirs
): prepare
1036 $(Q
)$(MAKE
) $(build
)=$@ need-builtin
=1
1038 filechk_kernel.release
= \
1039 echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1041 # Store (new) KERNELRELEASE string in include/config/kernel.release
1042 include/config
/kernel.release
: $(srctree
)/Makefile FORCE
1043 $(call filechk
,kernel.release
)
1045 # Additional helpers built in scripts/
1046 # Carefully list dependencies so we do not try to build scripts twice
1049 scripts
: scripts_basic scripts_dtc
1050 $(Q
)$(MAKE
) $(build
)=$(@
)
1052 # Things we need to do before we recursively start building the kernel
1053 # or the modules are listed in "prepare".
1054 # A multi level approach is used. prepareN is processed before prepareN-1.
1055 # archprepare is used in arch Makefiles and when processed asm symlink,
1056 # version.h and scripts_basic is processed / created.
1058 PHONY
+= prepare archprepare prepare1 prepare3
1060 # prepare3 is used to check if we are building in a separate output directory,
1062 # 1) Check that make has not been executed in the kernel src $(srctree)
1063 prepare3
: include/config
/kernel.release
1064 ifneq ($(KBUILD_SRC
),)
1065 @
$(kecho
) ' Using $(srctree) as source for kernel'
1066 $(Q
)if
[ -f
$(srctree
)/.config
-o
-d
$(srctree
)/include/config
]; then \
1067 echo
>&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1068 echo
>&2 " in the '$(srctree)' directory.";\
1073 prepare1
: prepare3 outputmakefile asm-generic
$(version_h
) $(autoksyms_h
) \
1074 include/generated
/utsrelease.h
1077 archprepare
: archheaders archscripts prepare1 scripts
1079 prepare0
: archprepare
1080 $(Q
)$(MAKE
) $(build
)=scripts
/mod
1081 $(Q
)$(MAKE
) $(build
)=.
1083 # All the preparing..
1084 prepare
: prepare0 prepare-objtool
1086 # Support for using generic headers in asm-generic
1087 asm-generic
:= -f
$(srctree
)/scripts
/Makefile.asm-generic obj
1089 PHONY
+= asm-generic uapi-asm-generic
1090 asm-generic
: uapi-asm-generic
1091 $(Q
)$(MAKE
) $(asm-generic
)=arch
/$(SRCARCH
)/include/generated
/asm
1093 $(Q
)$(MAKE
) $(asm-generic
)=arch
/$(SRCARCH
)/include/generated
/uapi
/asm
1095 PHONY
+= prepare-objtool
1096 prepare-objtool
: $(objtool_target
)
1097 ifeq ($(SKIP_STACK_VALIDATION
),1)
1098 ifdef CONFIG_UNWINDER_ORC
1099 @echo
"error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1102 @echo
"warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1106 # Generate some files
1107 # ---------------------------------------------------------------------------
1109 # KERNELRELEASE can change from a few different places, meaning version.h
1110 # needs to be updated, so this check is forced on all builds
1113 define filechk_utsrelease.h
1114 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
1115 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1118 echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\"
1121 define filechk_version.h
1122 echo \
#define LINUX_VERSION_CODE $(shell \
1123 expr
$(VERSION
) \
* 65536 + 0$(PATCHLEVEL
) \
* 256 + 0$(SUBLEVEL
)); \
1124 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1128 $(call filechk
,version.h
)
1129 $(Q
)rm -f
$(old_version_h
)
1131 include/generated
/utsrelease.h
: include/config
/kernel.release FORCE
1132 $(call filechk
,utsrelease.h
)
1136 $(Q
)find
$(srctree
)/include/ -name
'*.h' | xargs
--max-args
1 \
1137 $(srctree
)/scripts
/headerdep.pl
-I
$(srctree
)/include
1139 # ---------------------------------------------------------------------------
1142 #Default location for installed headers
1143 export INSTALL_HDR_PATH
= $(objtree
)/usr
1145 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1146 hdr-dst
= $(if
$(KBUILD_HEADERS
), dst
=include/arch-
$(SRCARCH
), dst
=include)
1148 PHONY
+= archheaders archscripts
1151 __headers
: $(version_h
) scripts_basic uapi-asm-generic archheaders archscripts
1152 $(Q
)$(MAKE
) $(build
)=scripts build_unifdef
1154 PHONY
+= headers_install_all
1155 headers_install_all
:
1156 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
install
1158 PHONY
+= headers_install
1159 headers_install
: __headers
1160 $(if
$(wildcard $(srctree
)/arch
/$(SRCARCH
)/include/uapi
/asm
/Kbuild
),, \
1161 $(error Headers not exportable for the
$(SRCARCH
) architecture
))
1162 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi dst
=include
1163 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(SRCARCH
)/include/uapi
$(hdr-dst
)
1165 PHONY
+= headers_check_all
1166 headers_check_all
: headers_install_all
1167 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
check
1169 PHONY
+= headers_check
1170 headers_check
: headers_install
1171 $(Q
)$(MAKE
) $(hdr-inst
)=include/uapi dst
=include HDRCHECK
=1
1172 $(Q
)$(MAKE
) $(hdr-inst
)=arch
/$(SRCARCH
)/include/uapi
$(hdr-dst
) HDRCHECK
=1
1174 ifdef CONFIG_HEADERS_CHECK
1178 # ---------------------------------------------------------------------------
1183 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests run_tests
1185 PHONY
+= kselftest-clean
1187 $(Q
)$(MAKE
) -C
$(srctree
)/tools
/testing
/selftests
clean
1189 PHONY
+= kselftest-merge
1191 $(if
$(wildcard $(objtree
)/.config
),, $(error No .config exists
, config your kernel first
!))
1192 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/kconfig
/merge_config.sh \
1193 -m
$(objtree
)/.config \
1194 $(srctree
)/tools
/testing
/selftests
/*/config
1195 +$(Q
)$(MAKE
) -f
$(srctree
)/Makefile olddefconfig
1197 # ---------------------------------------------------------------------------
1200 ifneq ($(wildcard $(srctree
)/arch
/$(SRCARCH
)/boot
/dts
/),)
1201 dtstree
:= arch
/$(SRCARCH
)/boot
/dts
1206 %.dtb
: prepare3 scripts_dtc
1207 $(Q
)$(MAKE
) $(build
)=$(dtstree
) $(dtstree
)/$@
1209 PHONY
+= dtbs dtbs_install dt_binding_check
1210 dtbs dtbs_check
: prepare3 scripts_dtc
1211 $(Q
)$(MAKE
) $(build
)=$(dtstree
)
1213 dtbs_check
: export CHECK_DTBS
=1
1214 dtbs_check
: dt_binding_check
1217 $(Q
)$(MAKE
) $(dtbinst
)=$(dtstree
)
1219 ifdef CONFIG_OF_EARLY_FLATTREE
1225 PHONY
+= scripts_dtc
1226 scripts_dtc
: scripts_basic
1227 $(Q
)$(MAKE
) $(build
)=scripts
/dtc
1229 dt_binding_check
: scripts_dtc
1230 $(Q
)$(MAKE
) $(build
)=Documentation
/devicetree
/bindings
1232 # ---------------------------------------------------------------------------
1235 ifdef CONFIG_MODULES
1237 # By default, build modules as well
1243 # A module can be listed more than once in obj-m resulting in
1244 # duplicate lines in modules.order files. Those are removed
1245 # using awk while concatenating to the final file.
1248 modules
: $(vmlinux-dirs
) $(if
$(KBUILD_BUILTIN
),vmlinux
) modules.builtin
1249 $(Q
)$(AWK
) '!x[$$0]++' $(vmlinux-dirs
:%=$(objtree
)/%/modules.order
) > $(objtree
)/modules.order
1250 @
$(kecho
) ' Building modules, stage 2.';
1251 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1253 modules.builtin
: $(vmlinux-dirs
:%=%/modules.builtin
)
1254 $(Q
)$(AWK
) '!x[$$0]++' $^
> $(objtree
)/modules.builtin
1256 %/modules.builtin
: include/config
/auto.conf
include/config
/tristate.conf
1257 $(Q
)$(MAKE
) $(modbuiltin
)=$*
1260 # Target to prepare building external modules
1261 PHONY
+= modules_prepare
1262 modules_prepare
: prepare
1264 # Target to install modules
1265 PHONY
+= modules_install
1266 modules_install
: _modinst_ _modinst_post
1270 @
rm -rf
$(MODLIB
)/kernel
1271 @
rm -f
$(MODLIB
)/source
1272 @mkdir
-p
$(MODLIB
)/kernel
1273 @ln
-s
$(abspath
$(srctree
)) $(MODLIB
)/source
1274 @if
[ ! $(objtree
) -ef
$(MODLIB
)/build
]; then \
1275 rm -f
$(MODLIB
)/build
; \
1276 ln
-s
$(CURDIR
) $(MODLIB
)/build
; \
1278 @cp
-f
$(objtree
)/modules.order
$(MODLIB
)/
1279 @cp
-f
$(objtree
)/modules.builtin
$(MODLIB
)/
1280 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1282 # This depmod is only for convenience to give the initial
1283 # boot a modules.dep even before / is mounted read-write. However the
1284 # boot script depmod is the master version.
1285 PHONY
+= _modinst_post
1286 _modinst_post
: _modinst_
1289 ifeq ($(CONFIG_MODULE_SIG
), y
)
1290 PHONY
+= modules_sign
1292 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modsign
1295 else # CONFIG_MODULES
1297 # Modules not configured
1298 # ---------------------------------------------------------------------------
1300 PHONY
+= modules modules_install
1301 modules modules_install
:
1303 @echo
>&2 "The present kernel configuration has modules disabled."
1304 @echo
>&2 "Type 'make config' and enable loadable module support."
1305 @echo
>&2 "Then build a kernel with module support enabled."
1309 endif # CONFIG_MODULES
1312 # Cleaning is done on three levels.
1313 # make clean Delete most generated files
1314 # Leave enough to build external modules
1315 # make mrproper Delete the current configuration, and all generated files
1316 # make distclean Remove editor backup files, patch leftover files and the like
1318 # Directories & files removed with 'make clean'
1319 CLEAN_DIRS
+= $(MODVERDIR
) include/ksym
1321 # Directories & files removed with 'make mrproper'
1322 MRPROPER_DIRS
+= include/config usr
/include include/generated \
1323 arch
/*/include/generated .tmp_objdiff
1324 MRPROPER_FILES
+= .config .config.old .version \
1325 Module.symvers
tags TAGS cscope
* GPATH GTAGS GRTAGS GSYMS \
1326 signing_key.pem signing_key.priv signing_key.x509 \
1327 x509.genkey extra_certificates signing_key.x509.keyid \
1328 signing_key.x509.signer vmlinux-gdb.py
1330 # clean - Delete most, but leave enough to build external modules
1332 clean: rm-dirs
:= $(CLEAN_DIRS
)
1333 clean: rm-files
:= $(CLEAN_FILES
)
1334 clean-dirs
:= $(addprefix _clean_
, .
$(vmlinux-alldirs
) Documentation samples
)
1336 PHONY
+= $(clean-dirs
) clean archclean vmlinuxclean
1338 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1341 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/link-vmlinux.sh
clean
1342 $(Q
)$(if
$(ARCH_POSTLINK
), $(MAKE
) -f
$(ARCH_POSTLINK
) clean)
1344 clean: archclean vmlinuxclean
1346 # mrproper - Delete all generated files, including .config
1348 mrproper
: rm-dirs
:= $(wildcard $(MRPROPER_DIRS
))
1349 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
1350 mrproper-dirs
:= $(addprefix _mrproper_
,scripts
)
1352 PHONY
+= $(mrproper-dirs
) mrproper
1354 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
1356 mrproper
: clean $(mrproper-dirs
)
1365 @find
$(srctree
) $(RCS_FIND_IGNORE
) \
1366 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
1367 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'*%' \
1368 -o
-name
'core' \
) \
1369 -type f
-print | xargs
rm -f
1372 # Packaging of the kernel to various formats
1373 # ---------------------------------------------------------------------------
1374 package-dir
:= scripts
/package
1377 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1378 %pkg
: include/config
/kernel.release FORCE
1379 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1382 # Brief documentation of the typical targets used
1383 # ---------------------------------------------------------------------------
1385 boards
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*_defconfig
)
1386 boards
:= $(sort $(notdir $(boards
)))
1387 board-dirs
:= $(dir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*/*_defconfig
))
1388 board-dirs
:= $(sort $(notdir $(board-dirs
:/=)))
1392 @echo
'Cleaning targets:'
1393 @echo
' clean - Remove most generated files but keep the config and'
1394 @echo
' enough build support to build external modules'
1395 @echo
' mrproper - Remove all generated files + config + various backup files'
1396 @echo
' distclean - mrproper + remove editor backup and patch files'
1398 @echo
'Configuration targets:'
1399 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
1401 @echo
'Other generic targets:'
1402 @echo
' all - Build all targets marked with [*]'
1403 @echo
'* vmlinux - Build the bare kernel'
1404 @echo
'* modules - Build all modules'
1405 @echo
' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1406 @echo
' dir/ - Build all files in dir and below'
1407 @echo
' dir/file.[ois] - Build specified target only'
1408 @echo
' dir/file.ll - Build the LLVM assembly file'
1409 @echo
' (requires compiler support for LLVM assembly generation)'
1410 @echo
' dir/file.lst - Build specified mixed source/assembly target only'
1411 @echo
' (requires a recent binutils and recent build (System.map))'
1412 @echo
' dir/file.ko - Build module including final link'
1413 @echo
' modules_prepare - Set up for building external modules'
1414 @echo
' tags/TAGS - Generate tags file for editors'
1415 @echo
' cscope - Generate cscope index'
1416 @echo
' gtags - Generate GNU GLOBAL index'
1417 @echo
' kernelrelease - Output the release version string (use with make -s)'
1418 @echo
' kernelversion - Output the version stored in Makefile (use with make -s)'
1419 @echo
' image_name - Output the image name (use with make -s)'
1420 @echo
' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1421 echo
' (default: $(INSTALL_HDR_PATH))'; \
1423 @echo
'Static analysers:'
1424 @echo
' checkstack - Generate a list of stack hogs'
1425 @echo
' namespacecheck - Name space analysis on compiled kernel'
1426 @echo
' versioncheck - Sanity check on version.h usage'
1427 @echo
' includecheck - Check for duplicate included header files'
1428 @echo
' export_report - List the usages of all exported symbols'
1429 @echo
' headers_check - Sanity check on exported headers'
1430 @echo
' headerdep - Detect inclusion cycles in headers'
1431 @echo
' coccicheck - Check with Coccinelle'
1433 @echo
'Kernel selftest:'
1434 @echo
' kselftest - Build and run kernel selftest (run as root)'
1435 @echo
' Build, install, and boot kernel before'
1436 @echo
' running kselftest on it'
1437 @echo
' kselftest-clean - Remove all generated kselftest files'
1438 @echo
' kselftest-merge - Merge all the config dependencies of kselftest to existing'
1442 echo
'Devicetree:'; \
1443 echo
'* dtbs - Build device tree blobs for enabled boards'; \
1444 echo
' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1447 @echo
'Userspace tools targets:'
1448 @echo
' use "make tools/help"'
1449 @echo
' or "cd tools; make help"'
1451 @echo
'Kernel packaging:'
1452 @
$(MAKE
) $(build
)=$(package-dir
) help
1454 @echo
'Documentation targets:'
1455 @
$(MAKE
) -f
$(srctree
)/Documentation
/Makefile dochelp
1457 @echo
'Architecture specific targets ($(SRCARCH)):'
1458 @
$(if
$(archhelp
),$(archhelp
),\
1459 echo
' No architecture specific help defined for $(SRCARCH)')
1462 $(foreach b
, $(boards
), \
1463 printf
" %-24s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
1465 @
$(if
$(board-dirs
), \
1466 $(foreach b
, $(board-dirs
), \
1467 printf
" %-16s - Show %s-specific targets\\n" help-
$(b
) $(b
);) \
1468 printf
" %-16s - Show all of the above\\n" help-boards
; \
1471 @echo
' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1472 @echo
' make V=2 [targets] 2 => give reason for rebuild of target'
1473 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
1474 @echo
' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1475 @echo
' make C=2 [targets] Force check of all c source with $$CHECK'
1476 @echo
' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1477 @echo
' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1478 @echo
' 1: warnings which may be relevant and do not occur too often'
1479 @echo
' 2: warnings which occur quite often but may still be relevant'
1480 @echo
' 3: more obscure warnings, can most likely be ignored'
1481 @echo
' Multiple levels can be combined with W=12 or W=123'
1483 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
1484 @echo
'For further info see the ./README file'
1487 help-board-dirs
:= $(addprefix help-
,$(board-dirs
))
1489 help-boards
: $(help-board-dirs
)
1491 boards-per-dir
= $(sort $(notdir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/$*/*_defconfig
)))
1493 $(help-board-dirs
): help-
%:
1494 @echo
'Architecture specific targets ($(SRCARCH) $*):'
1495 @
$(if
$(boards-per-dir
), \
1496 $(foreach b
, $(boards-per-dir
), \
1497 printf
" %-24s - Build for %s\\n" $*/$(b
) $(subst _defconfig
,,$(b
));) \
1501 # Documentation targets
1502 # ---------------------------------------------------------------------------
1503 DOC_TARGETS
:= xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1504 linkcheckdocs dochelp refcheckdocs
1505 PHONY
+= $(DOC_TARGETS
)
1506 $(DOC_TARGETS
): scripts_basic FORCE
1507 $(Q
)$(MAKE
) $(build
)=Documentation
$@
1510 # ---------------------------------------------------------------------------
1512 PHONY
+= scripts_gdb
1513 scripts_gdb
: prepare
1514 $(Q
)$(MAKE
) $(build
)=scripts
/gdb
1515 $(Q
)ln
-fsn
$(abspath
$(srctree
)/scripts
/gdb
/vmlinux-gdb.py
)
1517 ifdef CONFIG_GDB_SCRIPTS
1521 else # KBUILD_EXTMOD
1524 # External module support.
1525 # When building external modules the kernel used as basis is considered
1526 # read-only, and no consistency checks are made and the make
1527 # system is not used on the basis kernel. If updates are required
1528 # in the basis kernel ordinary make commands (without M=...) must
1531 # The following are the only valid targets when building external
1533 # make M=dir clean Delete all automatically generated files
1534 # make M=dir modules Make all modules in specified dir
1535 # make M=dir Same as 'make M=dir modules'
1536 # make M=dir modules_install
1537 # Install the modules built in the module directory
1538 # Assumes install directory is already created
1540 # We are always building modules
1543 PHONY
+= $(objtree
)/Module.symvers
1544 $(objtree
)/Module.symvers
:
1545 @
test -e
$(objtree
)/Module.symvers ||
( \
1547 echo
" WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1548 echo
" is missing; modules will have no dependencies and modversions."; \
1551 module-dirs
:= $(addprefix _module_
,$(KBUILD_EXTMOD
))
1552 PHONY
+= $(module-dirs
) modules
1553 $(module-dirs
): prepare
$(objtree
)/Module.symvers
1554 $(Q
)$(MAKE
) $(build
)=$(patsubst _module_
%,%,$@
)
1556 modules
: $(module-dirs
)
1557 @
$(kecho
) ' Building modules, stage 2.';
1558 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1560 PHONY
+= modules_install
1561 modules_install
: _emodinst_ _emodinst_post
1563 install-dir
:= $(if
$(INSTALL_MOD_DIR
),$(INSTALL_MOD_DIR
),extra
)
1566 $(Q
)mkdir
-p
$(MODLIB
)/$(install-dir
)
1567 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1569 PHONY
+= _emodinst_post
1570 _emodinst_post
: _emodinst_
1573 clean-dirs
:= $(addprefix _clean_
,$(KBUILD_EXTMOD
))
1575 PHONY
+= $(clean-dirs
) clean
1577 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1579 clean: rm-dirs
:= $(MODVERDIR
)
1580 clean: rm-files
:= $(KBUILD_EXTMOD
)/Module.symvers
1584 @echo
' Building external modules.'
1585 @echo
' Syntax: make -C path/to/kernel/src M=$$PWD target'
1587 @echo
' modules - default target, build the module(s)'
1588 @echo
' modules_install - install the module'
1589 @echo
' clean - remove generated files in module directory only'
1595 endif # KBUILD_EXTMOD
1597 clean: $(clean-dirs
)
1600 @find
$(if
$(KBUILD_EXTMOD
), $(KBUILD_EXTMOD
), .
) $(RCS_FIND_IGNORE
) \
1601 \
( -name
'*.[aios]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
1603 -o
-name
'*.dtb' -o
-name
'*.dtb.S' -o
-name
'*.dt.yaml' \
1604 -o
-name
'*.dwo' -o
-name
'*.lst' \
1606 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
1607 -o
-name
'*.lex.c' -o
-name
'*.tab.[ch]' \
1608 -o
-name
'*.asn1.[ch]' \
1609 -o
-name
'*.symtypes' -o
-name
'modules.order' \
1610 -o
-name modules.builtin
-o
-name
'.tmp_*.o.*' \
1611 -o
-name
'*.c.[012]*.*' \
1613 -o
-name
'*.gcno' \
) -type f
-print | xargs
rm -f
1615 # Generate tags for editors
1616 # ---------------------------------------------------------------------------
1617 quiet_cmd_tags
= GEN
$@
1618 cmd_tags
= $(CONFIG_SHELL
) $(srctree
)/scripts
/tags.sh
$@
1620 tags TAGS cscope gtags
: FORCE
1623 # Scripts to check various things for consistency
1624 # ---------------------------------------------------------------------------
1626 PHONY
+= includecheck versioncheck coccicheck namespacecheck export_report
1629 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1630 -name
'*.[hcS]' -type f
-print |
sort \
1631 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkincludes.pl
1634 find
$(srctree
)/* $(RCS_FIND_IGNORE
) \
1635 -name
'*.[hcS]' -type f
-print |
sort \
1636 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkversion.pl
1639 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/$@
1642 $(PERL
) $(srctree
)/scripts
/namespace.pl
1645 $(PERL
) $(srctree
)/scripts
/export_report.pl
1647 PHONY
+= checkstack kernelrelease kernelversion image_name
1649 # UML needs a little special treatment here. It wants to use the host
1650 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1651 # else wants $(ARCH), including people doing cross-builds, which means
1652 # that $(SUBARCH) doesn't work here.
1654 CHECKSTACK_ARCH
:= $(SUBARCH
)
1656 CHECKSTACK_ARCH
:= $(ARCH
)
1659 $(OBJDUMP
) -d vmlinux
$$(find .
-name
'*.ko') | \
1660 $(PERL
) $(src
)/scripts
/checkstack.pl
$(CHECKSTACK_ARCH
)
1663 @echo
"$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1666 @echo
$(KERNELVERSION
)
1669 @echo
$(KBUILD_IMAGE
)
1671 # Clear a bunch of variables before executing the submake
1673 ifeq ($(quiet
),silent_
)
1678 $(Q
)mkdir
-p
$(objtree
)/tools
1679 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(src
)/tools
/
1682 $(Q
)mkdir
-p
$(objtree
)/tools
1683 $(Q
)$(MAKE
) LDFLAGS
= MAKEFLAGS
="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O
=$(abspath
$(objtree
)) subdir
=tools
-C
$(src
)/tools
/ $*
1686 # ---------------------------------------------------------------------------
1687 # Single targets are compatible with:
1688 # - build with mixed source and output
1689 # - build with separate output dir 'make O=...'
1690 # - external modules
1692 # target-dir => where to store outputfile
1693 # build-dir => directory in kernel source tree to use
1695 build-target
= $(if
$(KBUILD_EXTMOD
), $(KBUILD_EXTMOD
)/)$@
1696 build-dir
= $(patsubst %/,%,$(dir $(build-target
)))
1699 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(build-target
)
1701 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(build-target
)
1702 %.lst
: prepare FORCE
1703 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(build-target
)
1705 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(build-target
)
1707 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(build-target
)
1708 %.symtypes
: prepare FORCE
1709 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(build-target
)
1711 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1717 # Make sure the latest headers are built for Documentation
1718 Documentation
/ samples
/: headers_install
1720 $(Q
)$(MAKE
) KBUILD_MODULES
=1 $(build
)=$(build-dir
)
1722 # FIXME Should go into a make.lib or something
1723 # ===========================================================================
1725 quiet_cmd_rmdirs
= $(if
$(wildcard $(rm-dirs
)),CLEAN
$(wildcard $(rm-dirs
)))
1726 cmd_rmdirs
= rm -rf
$(rm-dirs
)
1728 quiet_cmd_rmfiles
= $(if
$(wildcard $(rm-files
)),CLEAN
$(wildcard $(rm-files
)))
1729 cmd_rmfiles
= rm -f
$(rm-files
)
1731 # Run depmod only if we have System.map and depmod is executable
1732 quiet_cmd_depmod
= DEPMOD
$(KERNELRELEASE
)
1733 cmd_depmod
= $(CONFIG_SHELL
) $(srctree
)/scripts
/depmod.sh
$(DEPMOD
) \
1736 # Create temporary dir for module support files
1737 # clean it up only when building all modules
1738 cmd_crmodverdir
= $(Q
)mkdir
-p
$(MODVERDIR
) \
1739 $(if
$(KBUILD_MODULES
),; rm -f
$(MODVERDIR
)/*)
1741 # read saved command lines for existing targets
1742 existing-targets
:= $(wildcard $(sort $(targets
)))
1744 -include $(foreach f
,$(existing-targets
),$(dir $(f
)).
$(notdir $(f
)).cmd
)
1746 endif # ifeq ($(config-targets),1)
1747 endif # ifeq ($(mixed-targets),1)
1748 endif # sub-make-done
1753 # Declare the contents of the PHONY variable as phony. We keep that
1754 # information in a variable so we can use it in if_changed and friends.