bpf: add bpf_jit_limit knob to restrict unpriv allocations
[linux/fpc-iii.git] / Makefile
blob4fdc9d984f80b9c58191f088301f459bf8fee280
1 VERSION = 4
2 PATCHLEVEL = 9
3 SUBLEVEL = 189
4 EXTRAVERSION =
5 NAME = Roaring Lionus
7 # *DOCUMENTATION*
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
19 unexport LC_ALL
20 LC_COLLATE=C
21 LC_NUMERIC=C
22 export LC_COLLATE LC_NUMERIC
24 # Avoid interference with shell env settings
25 unexport GREP_OPTIONS
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
36 # is now up to date.
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
41 # prepare rule.
43 # Beautify output
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.
61 # $(Q)ln $@ :<
63 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
64 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
66 # To put more focus on warnings, be less verbose as default
67 # Use 'make V=1' to see the full commands
69 ifeq ("$(origin V)", "command line")
70 KBUILD_VERBOSE = $(V)
71 endif
72 ifndef KBUILD_VERBOSE
73 KBUILD_VERBOSE = 0
74 endif
76 ifeq ($(KBUILD_VERBOSE),1)
77 quiet =
78 Q =
79 else
80 quiet=quiet_
81 Q = @
82 endif
84 # If the user is running make -s (silent mode), suppress echoing of
85 # commands
87 ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
88 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
89 quiet=silent_
90 tools_silent=s
91 endif
92 else # make-3.8x
93 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
94 quiet=silent_
95 tools_silent=-s
96 endif
97 endif
99 export quiet Q KBUILD_VERBOSE
101 # kbuild supports saving output files in a separate directory.
102 # To locate output files in a separate directory two syntaxes are supported.
103 # In both cases the working directory must be the root of the kernel src.
104 # 1) O=
105 # Use "make O=dir/to/store/output/files/"
107 # 2) Set KBUILD_OUTPUT
108 # Set the environment variable KBUILD_OUTPUT to point to the directory
109 # where the output files shall be placed.
110 # export KBUILD_OUTPUT=dir/to/store/output/files/
111 # make
113 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
114 # variable.
116 # KBUILD_SRC is set on invocation of make in OBJ directory
117 # KBUILD_SRC is not intended to be used by the regular user (for now)
118 ifeq ($(KBUILD_SRC),)
120 # OK, Make called in directory where kernel src resides
121 # Do we want to locate output files in a separate directory?
122 ifeq ("$(origin O)", "command line")
123 KBUILD_OUTPUT := $(O)
124 endif
126 # That's our default target when none is given on the command line
127 PHONY := _all
128 _all:
130 # Cancel implicit rules on top Makefile
131 $(CURDIR)/Makefile Makefile: ;
133 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
134 $(error main directory cannot contain spaces nor colons)
135 endif
137 ifneq ($(KBUILD_OUTPUT),)
138 # Invoke a second make in the output directory, passing relevant variables
139 # check that the output directory actually exists
140 saved-output := $(KBUILD_OUTPUT)
141 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
142 && /bin/pwd)
143 $(if $(KBUILD_OUTPUT),, \
144 $(error failed to create output directory "$(saved-output)"))
146 PHONY += $(MAKECMDGOALS) sub-make
148 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
151 sub-make:
152 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
153 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
155 # Leave processing to above invocation of make
156 skip-makefile := 1
157 endif # ifneq ($(KBUILD_OUTPUT),)
158 endif # ifeq ($(KBUILD_SRC),)
160 # We process the rest of the Makefile if this is the final invocation of make
161 ifeq ($(skip-makefile),)
163 # Do not print "Entering directory ...",
164 # but we want to display it when entering to the output directory
165 # so that IDEs/editors are able to understand relative filenames.
166 MAKEFLAGS += --no-print-directory
168 # Call a source code checker (by default, "sparse") as part of the
169 # C compilation.
171 # Use 'make C=1' to enable checking of only re-compiled files.
172 # Use 'make C=2' to enable checking of *all* source files, regardless
173 # of whether they are re-compiled or not.
175 # See the file "Documentation/sparse.txt" for more details, including
176 # where to get the "sparse" utility.
178 ifeq ("$(origin C)", "command line")
179 KBUILD_CHECKSRC = $(C)
180 endif
181 ifndef KBUILD_CHECKSRC
182 KBUILD_CHECKSRC = 0
183 endif
185 # Use make M=dir to specify directory of external module to build
186 # Old syntax make ... SUBDIRS=$PWD is still supported
187 # Setting the environment variable KBUILD_EXTMOD take precedence
188 ifdef SUBDIRS
189 KBUILD_EXTMOD ?= $(SUBDIRS)
190 endif
192 ifeq ("$(origin M)", "command line")
193 KBUILD_EXTMOD := $(M)
194 endif
196 # If building an external module we do not care about the all: rule
197 # but instead _all depend on modules
198 PHONY += all
199 ifeq ($(KBUILD_EXTMOD),)
200 _all: all
201 else
202 _all: modules
203 endif
205 ifeq ($(KBUILD_SRC),)
206 # building in the source tree
207 srctree := .
208 else
209 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
210 # building in a subdirectory of the source tree
211 srctree := ..
212 else
213 srctree := $(KBUILD_SRC)
214 endif
215 endif
216 objtree := .
217 src := $(srctree)
218 obj := $(objtree)
220 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
222 export srctree objtree VPATH
224 # SUBARCH tells the usermode build what the underlying arch is. That is set
225 # first, and if a usermode build is happening, the "ARCH=um" on the command
226 # line overrides the setting of ARCH below. If a native build is happening,
227 # then ARCH is assigned, getting whatever value it gets normally, and
228 # SUBARCH is subsequently ignored.
230 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
231 -e s/sun4u/sparc64/ \
232 -e s/arm.*/arm/ -e s/sa110/arm/ \
233 -e s/s390x/s390/ -e s/parisc64/parisc/ \
234 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
235 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
237 # Cross compiling and selecting different set of gcc/bin-utils
238 # ---------------------------------------------------------------------------
240 # When performing cross compilation for other architectures ARCH shall be set
241 # to the target architecture. (See arch/* for the possibilities).
242 # ARCH can be set during invocation of make:
243 # make ARCH=ia64
244 # Another way is to have ARCH set in the environment.
245 # The default ARCH is the host where make is executed.
247 # CROSS_COMPILE specify the prefix used for all executables used
248 # during compilation. Only gcc and related bin-utils executables
249 # are prefixed with $(CROSS_COMPILE).
250 # CROSS_COMPILE can be set on the command line
251 # make CROSS_COMPILE=ia64-linux-
252 # Alternatively CROSS_COMPILE can be set in the environment.
253 # A third alternative is to store a setting in .config so that plain
254 # "make" in the configured kernel build directory always uses that.
255 # Default value for CROSS_COMPILE is not to prefix executables
256 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
257 ARCH ?= $(SUBARCH)
258 CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
260 # Architecture as present in compile.h
261 UTS_MACHINE := $(ARCH)
262 SRCARCH := $(ARCH)
264 # Additional ARCH settings for x86
265 ifeq ($(ARCH),i386)
266 SRCARCH := x86
267 endif
268 ifeq ($(ARCH),x86_64)
269 SRCARCH := x86
270 endif
272 # Additional ARCH settings for sparc
273 ifeq ($(ARCH),sparc32)
274 SRCARCH := sparc
275 endif
276 ifeq ($(ARCH),sparc64)
277 SRCARCH := sparc
278 endif
280 # Additional ARCH settings for sh
281 ifeq ($(ARCH),sh64)
282 SRCARCH := sh
283 endif
285 # Additional ARCH settings for tile
286 ifeq ($(ARCH),tilepro)
287 SRCARCH := tile
288 endif
289 ifeq ($(ARCH),tilegx)
290 SRCARCH := tile
291 endif
293 # Where to locate arch specific headers
294 hdr-arch := $(SRCARCH)
296 KCONFIG_CONFIG ?= .config
297 export KCONFIG_CONFIG
299 # SHELL used by kbuild
300 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
301 else if [ -x /bin/bash ]; then echo /bin/bash; \
302 else echo sh; fi ; fi)
304 HOSTCC = gcc
305 HOSTCXX = g++
306 HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
307 HOSTCXXFLAGS = -O2
309 # Decide whether to build built-in, modular, or both.
310 # Normally, just do built-in.
312 KBUILD_MODULES :=
313 KBUILD_BUILTIN := 1
315 # If we have only "make modules", don't compile built-in objects.
316 # When we're building modules with modversions, we need to consider
317 # the built-in objects during the descend as well, in order to
318 # make sure the checksums are up to date before we record them.
320 ifeq ($(MAKECMDGOALS),modules)
321 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
322 endif
324 # If we have "make <whatever> modules", compile modules
325 # in addition to whatever we do anyway.
326 # Just "make" or "make all" shall build modules as well
328 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
329 KBUILD_MODULES := 1
330 endif
332 ifeq ($(MAKECMDGOALS),)
333 KBUILD_MODULES := 1
334 endif
336 export KBUILD_MODULES KBUILD_BUILTIN
337 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
339 # We need some generic definitions (do not try to remake the file).
340 scripts/Kbuild.include: ;
341 include scripts/Kbuild.include
343 # Make variables (CC, etc...)
344 AS = $(CROSS_COMPILE)as
345 LD = $(CROSS_COMPILE)ld
346 CC = $(CROSS_COMPILE)gcc
347 CPP = $(CC) -E
348 AR = $(CROSS_COMPILE)ar
349 NM = $(CROSS_COMPILE)nm
350 STRIP = $(CROSS_COMPILE)strip
351 OBJCOPY = $(CROSS_COMPILE)objcopy
352 OBJDUMP = $(CROSS_COMPILE)objdump
353 AWK = awk
354 GENKSYMS = scripts/genksyms/genksyms
355 INSTALLKERNEL := installkernel
356 DEPMOD = /sbin/depmod
357 PERL = perl
358 PYTHON = python
359 CHECK = sparse
361 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
362 -Wbitwise -Wno-return-void $(CF)
363 NOSTDINC_FLAGS =
364 CFLAGS_MODULE =
365 AFLAGS_MODULE =
366 LDFLAGS_MODULE =
367 CFLAGS_KERNEL =
368 AFLAGS_KERNEL =
369 LDFLAGS_vmlinux =
371 # Use USERINCLUDE when you must reference the UAPI directories only.
372 USERINCLUDE := \
373 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
374 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
375 -I$(srctree)/include/uapi \
376 -I$(objtree)/include/generated/uapi \
377 -include $(srctree)/include/linux/kconfig.h
379 # Use LINUXINCLUDE when you must reference the include/ directory.
380 # Needed to be compatible with the O= option
381 LINUXINCLUDE := \
382 -I$(srctree)/arch/$(hdr-arch)/include \
383 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
384 -I$(objtree)/arch/$(hdr-arch)/include/generated \
385 $(if $(KBUILD_SRC), -I$(srctree)/include) \
386 -I$(objtree)/include
388 LINUXINCLUDE += $(filter-out $(LINUXINCLUDE),$(USERINCLUDE))
390 KBUILD_AFLAGS := -D__ASSEMBLY__
391 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
392 -fno-strict-aliasing -fno-common -fshort-wchar \
393 -Werror-implicit-function-declaration \
394 -Wno-format-security \
395 -std=gnu89
396 KBUILD_CPPFLAGS := -D__KERNEL__
397 KBUILD_AFLAGS_KERNEL :=
398 KBUILD_CFLAGS_KERNEL :=
399 KBUILD_AFLAGS_MODULE := -DMODULE
400 KBUILD_CFLAGS_MODULE := -DMODULE
401 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
402 GCC_PLUGINS_CFLAGS :=
403 CLANG_FLAGS :=
405 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
406 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
407 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
409 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
410 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
411 export CPP AR NM STRIP OBJCOPY OBJDUMP
412 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
413 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
415 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
416 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
417 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
418 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
419 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
420 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
421 export KBUILD_ARFLAGS
423 # When compiling out-of-tree modules, put MODVERDIR in the module
424 # tree rather than in the kernel tree. The kernel tree might
425 # even be read-only.
426 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
428 # Files to ignore in find ... statements
430 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
431 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
432 -prune -o
433 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
434 --exclude CVS --exclude .pc --exclude .hg --exclude .git
436 # ===========================================================================
437 # Rules shared between *config targets and build targets
439 # Basic helpers built in scripts/
440 PHONY += scripts_basic
441 scripts_basic:
442 $(Q)$(MAKE) $(build)=scripts/basic
443 $(Q)rm -f .tmp_quiet_recordmcount
445 # To avoid any implicit rule to kick in, define an empty command.
446 scripts/basic/%: scripts_basic ;
448 PHONY += outputmakefile
449 # outputmakefile generates a Makefile in the output directory, if using a
450 # separate output directory. This allows convenient use of make in the
451 # output directory.
452 outputmakefile:
453 ifneq ($(KBUILD_SRC),)
454 $(Q)ln -fsn $(srctree) source
455 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
456 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
457 endif
459 # Support for using generic headers in asm-generic
460 PHONY += asm-generic
461 asm-generic:
462 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
463 src=asm obj=arch/$(SRCARCH)/include/generated/asm
464 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
465 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
467 # To make sure we do not include .config for any of the *config targets
468 # catch them early, and hand them over to scripts/kconfig/Makefile
469 # It is allowed to specify more targets when calling make, including
470 # mixing *config targets and build targets.
471 # For example 'make oldconfig all'.
472 # Detect when mixed targets is specified, and make a second invocation
473 # of make so .config is not included in this case either (for *config).
475 version_h := include/generated/uapi/linux/version.h
476 old_version_h := include/linux/version.h
478 no-dot-config-targets := clean mrproper distclean \
479 cscope gtags TAGS tags help% %docs check% coccicheck \
480 $(version_h) headers_% archheaders archscripts \
481 kernelversion %src-pkg
483 config-targets := 0
484 mixed-targets := 0
485 dot-config := 1
487 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
488 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
489 dot-config := 0
490 endif
491 endif
493 ifeq ($(KBUILD_EXTMOD),)
494 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
495 config-targets := 1
496 ifneq ($(words $(MAKECMDGOALS)),1)
497 mixed-targets := 1
498 endif
499 endif
500 endif
501 # install and module_install need also be processed one by one
502 ifneq ($(filter install,$(MAKECMDGOALS)),)
503 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
504 mixed-targets := 1
505 endif
506 endif
508 ifeq ($(cc-name),clang)
509 ifneq ($(CROSS_COMPILE),)
510 CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
511 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
512 CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)
513 GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
514 endif
515 ifneq ($(GCC_TOOLCHAIN),)
516 CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
517 endif
518 CLANG_FLAGS += -no-integrated-as
519 CLANG_FLAGS += -Werror=unknown-warning-option
520 KBUILD_CFLAGS += $(CLANG_FLAGS)
521 KBUILD_AFLAGS += $(CLANG_FLAGS)
522 endif
525 ifeq ($(mixed-targets),1)
526 # ===========================================================================
527 # We're called with mixed targets (*config and build targets).
528 # Handle them one by one.
530 PHONY += $(MAKECMDGOALS) __build_one_by_one
532 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
535 __build_one_by_one:
536 $(Q)set -e; \
537 for i in $(MAKECMDGOALS); do \
538 $(MAKE) -f $(srctree)/Makefile $$i; \
539 done
541 else
542 ifeq ($(config-targets),1)
543 # ===========================================================================
544 # *config targets only - make sure prerequisites are updated, and descend
545 # in scripts/kconfig to make the *config target
547 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
548 # KBUILD_DEFCONFIG may point out an alternative default configuration
549 # used for 'make defconfig'
550 include arch/$(SRCARCH)/Makefile
551 export KBUILD_DEFCONFIG KBUILD_KCONFIG
553 config: scripts_basic outputmakefile FORCE
554 $(Q)$(MAKE) $(build)=scripts/kconfig $@
556 %config: scripts_basic outputmakefile FORCE
557 $(Q)$(MAKE) $(build)=scripts/kconfig $@
559 else
560 # ===========================================================================
561 # Build targets only - this includes vmlinux, arch specific targets, clean
562 # targets and others. In general all targets except *config targets.
564 ifeq ($(KBUILD_EXTMOD),)
565 # Additional helpers built in scripts/
566 # Carefully list dependencies so we do not try to build scripts twice
567 # in parallel
568 PHONY += scripts
569 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
570 asm-generic gcc-plugins
571 $(Q)$(MAKE) $(build)=$(@)
573 # Objects we will link into vmlinux / subdirs we need to visit
574 init-y := init/
575 drivers-y := drivers/ sound/ firmware/
576 net-y := net/
577 libs-y := lib/
578 core-y := usr/
579 virt-y := virt/
580 endif # KBUILD_EXTMOD
582 ifeq ($(dot-config),1)
583 # Read in config
584 -include include/config/auto.conf
586 ifeq ($(KBUILD_EXTMOD),)
587 # Read in dependencies to all Kconfig* files, make sure to run
588 # oldconfig if changes are detected.
589 -include include/config/auto.conf.cmd
591 # To avoid any implicit rule to kick in, define an empty command
592 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
594 # If .config is newer than include/config/auto.conf, someone tinkered
595 # with it and forgot to run make oldconfig.
596 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
597 # we execute the config step to be sure to catch updated Kconfig files
598 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
599 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
600 else
601 # external modules needs include/generated/autoconf.h and include/config/auto.conf
602 # but do not care if they are up-to-date. Use auto.conf to trigger the test
603 PHONY += include/config/auto.conf
605 include/config/auto.conf:
606 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
607 echo >&2; \
608 echo >&2 " ERROR: Kernel configuration is invalid."; \
609 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
610 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
611 echo >&2 ; \
612 /bin/false)
614 endif # KBUILD_EXTMOD
616 else
617 # Dummy target needed, because used as prerequisite
618 include/config/auto.conf: ;
619 endif # $(dot-config)
621 # For the kernel to actually contain only the needed exported symbols,
622 # we have to build modules as well to determine what those symbols are.
623 # (this can be evaluated only once include/config/auto.conf has been included)
624 ifdef CONFIG_TRIM_UNUSED_KSYMS
625 KBUILD_MODULES := 1
626 endif
628 # The all: target is the default when no target is given on the
629 # command line.
630 # This allow a user to issue only 'make' to build a kernel including modules
631 # Defaults to vmlinux, but the arch makefile usually adds further targets
632 all: vmlinux
634 KBUILD_CFLAGS += $(call cc-option,-fno-PIE)
635 KBUILD_AFLAGS += $(call cc-option,-fno-PIE)
636 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
637 CFLAGS_KCOV := $(call cc-option,-fsanitize-coverage=trace-pc,)
638 export CFLAGS_GCOV CFLAGS_KCOV
640 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
641 # values of the respective KBUILD_* variables
642 ARCH_CPPFLAGS :=
643 ARCH_AFLAGS :=
644 ARCH_CFLAGS :=
645 include arch/$(SRCARCH)/Makefile
647 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
648 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
649 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
650 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
651 KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context)
652 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
653 KBUILD_CFLAGS += $(call cc-disable-warning, attribute-alias)
655 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
656 KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,)
657 KBUILD_CFLAGS += $(call cc-option,-fdata-sections,)
658 endif
660 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
661 KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
662 else
663 ifdef CONFIG_PROFILE_ALL_BRANCHES
664 KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,)
665 else
666 KBUILD_CFLAGS += -O2
667 endif
668 endif
670 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
671 $(call cc-disable-warning,maybe-uninitialized,))
673 # Tell gcc to never replace conditional load with a non-conditional one
674 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
676 # check for 'asm goto'
677 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
678 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
679 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
680 endif
682 include scripts/Makefile.gcc-plugins
684 ifdef CONFIG_READABLE_ASM
685 # Disable optimizations that make assembler listings hard to read.
686 # reorder blocks reorders the control in the function
687 # ipa clone creates specialized cloned functions
688 # partial inlining inlines only parts of functions
689 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
690 $(call cc-option,-fno-ipa-cp-clone,) \
691 $(call cc-option,-fno-partial-inlining)
692 endif
694 ifneq ($(CONFIG_FRAME_WARN),0)
695 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
696 endif
698 # This selects the stack protector compiler flag. Testing it is delayed
699 # until after .config has been reprocessed, in the prepare-compiler-check
700 # target.
701 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
702 stackp-flag := -fstack-protector
703 stackp-name := REGULAR
704 else
705 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
706 stackp-flag := -fstack-protector-strong
707 stackp-name := STRONG
708 else
709 # Force off for distro compilers that enable stack protector by default.
710 stackp-flag := $(call cc-option, -fno-stack-protector)
711 endif
712 endif
713 # Find arch-specific stack protector compiler sanity-checking script.
714 ifdef CONFIG_CC_STACKPROTECTOR
715 stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
716 stackp-check := $(wildcard $(stackp-path))
717 endif
718 KBUILD_CFLAGS += $(stackp-flag)
720 ifeq ($(cc-name),clang)
721 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
722 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
723 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
724 # Quiet clang warning: comparison of unsigned expression < 0 is always false
725 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
726 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
727 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
728 # See modpost pattern 2
729 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
730 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
731 else
733 # These warnings generated too much noise in a regular build.
734 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
735 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
736 endif
738 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
739 ifdef CONFIG_FRAME_POINTER
740 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
741 else
742 # Some targets (ARM with Thumb2, for example), can't be built with frame
743 # pointers. For those, we don't have FUNCTION_TRACER automatically
744 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
745 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
746 # -fomit-frame-pointer with FUNCTION_TRACER.
747 ifndef CONFIG_FUNCTION_TRACER
748 KBUILD_CFLAGS += -fomit-frame-pointer
749 endif
750 endif
752 KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
754 ifdef CONFIG_DEBUG_INFO
755 ifdef CONFIG_DEBUG_INFO_SPLIT
756 KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
757 else
758 KBUILD_CFLAGS += -g
759 endif
760 KBUILD_AFLAGS += -Wa,-gdwarf-2
761 endif
762 ifdef CONFIG_DEBUG_INFO_DWARF4
763 KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
764 endif
766 ifdef CONFIG_DEBUG_INFO_REDUCED
767 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
768 $(call cc-option,-fno-var-tracking)
769 endif
771 ifdef CONFIG_FUNCTION_TRACER
772 ifndef CC_FLAGS_FTRACE
773 CC_FLAGS_FTRACE := -pg
774 endif
775 export CC_FLAGS_FTRACE
776 ifdef CONFIG_HAVE_FENTRY
777 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
778 endif
779 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
780 KBUILD_AFLAGS += $(CC_USING_FENTRY)
781 ifdef CONFIG_DYNAMIC_FTRACE
782 ifdef CONFIG_HAVE_C_RECORDMCOUNT
783 BUILD_C_RECORDMCOUNT := y
784 export BUILD_C_RECORDMCOUNT
785 endif
786 endif
787 endif
789 # We trigger additional mismatches with less inlining
790 ifdef CONFIG_DEBUG_SECTION_MISMATCH
791 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
792 endif
794 # arch Makefile may override CC so keep this after arch Makefile is included
795 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
796 CHECKFLAGS += $(NOSTDINC_FLAGS)
798 # warn about C99 declaration after statement
799 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
801 # disable pointer signed / unsigned warnings in gcc 4.0
802 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
804 # disable stringop warnings in gcc 8+
805 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
807 # disable invalid "can't wrap" optimizations for signed / pointers
808 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
810 # clang sets -fmerge-all-constants by default as optimization, but this
811 # is non-conforming behavior for C and in fact breaks the kernel, so we
812 # need to disable it here generally.
813 KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants)
815 # for gcc -fno-merge-all-constants disables everything, but it is fine
816 # to have actual conforming behavior enabled.
817 KBUILD_CFLAGS += $(call cc-option,-fmerge-constants)
819 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
820 KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,)
822 # conserve stack if available
823 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
825 # disallow errors like 'EXPORT_GPL(foo);' with missing header
826 KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
828 # require functions to have arguments in prototypes, not empty 'int foo()'
829 KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
831 # Prohibit date/time macros, which would make the build non-deterministic
832 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
834 # enforce correct pointer usage
835 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
837 # use the deterministic mode of AR if available
838 KBUILD_ARFLAGS := $(call ar-option,D)
840 include scripts/Makefile.kasan
841 include scripts/Makefile.extrawarn
842 include scripts/Makefile.ubsan
844 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
845 # last assignments
846 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
847 KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
848 KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
850 # Use --build-id when available.
851 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
852 $(call cc-ldoption, -Wl$(comma)--build-id,))
853 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
854 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
856 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
857 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
858 endif
860 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
861 LDFLAGS_vmlinux += $(call ld-option, -X,)
862 endif
864 # Default kernel image to build when no specific target is given.
865 # KBUILD_IMAGE may be overruled on the command line or
866 # set in the environment
867 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
868 # this default value
869 export KBUILD_IMAGE ?= vmlinux
872 # INSTALL_PATH specifies where to place the updated kernel and system map
873 # images. Default is /boot, but you can set it to other values
874 export INSTALL_PATH ?= /boot
877 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
878 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
879 # an argument if needed. Otherwise it defaults to the kernel install path
881 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
884 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
885 # relocations required by build roots. This is not defined in the
886 # makefile but the argument can be passed to make if needed.
889 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
890 export MODLIB
893 # INSTALL_MOD_STRIP, if defined, will cause modules to be
894 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
895 # the default option --strip-debug will be used. Otherwise,
896 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
898 ifdef INSTALL_MOD_STRIP
899 ifeq ($(INSTALL_MOD_STRIP),1)
900 mod_strip_cmd = $(STRIP) --strip-debug
901 else
902 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
903 endif # INSTALL_MOD_STRIP=1
904 else
905 mod_strip_cmd = true
906 endif # INSTALL_MOD_STRIP
907 export mod_strip_cmd
909 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
910 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
911 # or CONFIG_MODULE_COMPRESS_XZ.
913 mod_compress_cmd = true
914 ifdef CONFIG_MODULE_COMPRESS
915 ifdef CONFIG_MODULE_COMPRESS_GZIP
916 mod_compress_cmd = gzip -n -f
917 endif # CONFIG_MODULE_COMPRESS_GZIP
918 ifdef CONFIG_MODULE_COMPRESS_XZ
919 mod_compress_cmd = xz -f
920 endif # CONFIG_MODULE_COMPRESS_XZ
921 endif # CONFIG_MODULE_COMPRESS
922 export mod_compress_cmd
924 # Select initial ramdisk compression format, default is gzip(1).
925 # This shall be used by the dracut(8) tool while creating an initramfs image.
927 INITRD_COMPRESS-y := gzip
928 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
929 INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
930 INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
931 INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
932 INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
933 # do not export INITRD_COMPRESS, since we didn't actually
934 # choose a sane default compression above.
935 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
937 ifdef CONFIG_MODULE_SIG_ALL
938 $(eval $(call config_filename,MODULE_SIG_KEY))
940 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
941 else
942 mod_sign_cmd = true
943 endif
944 export mod_sign_cmd
947 ifeq ($(KBUILD_EXTMOD),)
948 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
950 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
951 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
952 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
954 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
955 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
957 init-y := $(patsubst %/, %/built-in.o, $(init-y))
958 core-y := $(patsubst %/, %/built-in.o, $(core-y))
959 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
960 net-y := $(patsubst %/, %/built-in.o, $(net-y))
961 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
962 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
963 libs-y := $(libs-y1) $(libs-y2)
964 virt-y := $(patsubst %/, %/built-in.o, $(virt-y))
966 # Externally visible symbols (used by link-vmlinux.sh)
967 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
968 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
969 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
970 export LDFLAGS_vmlinux
971 # used by scripts/pacmage/Makefile
972 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
974 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
976 # Include targets which we want to execute sequentially if the rest of the
977 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
978 # evaluated more than once.
979 PHONY += vmlinux_prereq
980 vmlinux_prereq: $(vmlinux-deps) FORCE
981 ifdef CONFIG_HEADERS_CHECK
982 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
983 endif
984 ifdef CONFIG_GDB_SCRIPTS
985 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
986 endif
987 ifdef CONFIG_TRIM_UNUSED_KSYMS
988 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
989 "$(MAKE) -f $(srctree)/Makefile vmlinux"
990 endif
992 # standalone target for easier testing
993 include/generated/autoksyms.h: FORCE
994 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
996 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
998 # Final link of vmlinux with optional arch pass after final link
999 cmd_link-vmlinux = \
1000 $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ; \
1001 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1003 vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
1004 +$(call if_changed,link-vmlinux)
1006 # Build samples along the rest of the kernel
1007 ifdef CONFIG_SAMPLES
1008 vmlinux-dirs += samples
1009 endif
1011 # The actual objects are generated when descending,
1012 # make sure no implicit rule kicks in
1013 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1015 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1016 # Preset locale variables to speed up the build process. Limit locale
1017 # tweaks to this spot to avoid wrong language settings when running
1018 # make menuconfig etc.
1019 # Error messages still appears in the original language
1021 PHONY += $(vmlinux-dirs)
1022 $(vmlinux-dirs): prepare scripts
1023 $(Q)$(MAKE) $(build)=$@
1025 define filechk_kernel.release
1026 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1027 endef
1029 # Store (new) KERNELRELEASE string in include/config/kernel.release
1030 include/config/kernel.release: include/config/auto.conf FORCE
1031 $(call filechk,kernel.release)
1034 # Things we need to do before we recursively start building the kernel
1035 # or the modules are listed in "prepare".
1036 # A multi level approach is used. prepareN is processed before prepareN-1.
1037 # archprepare is used in arch Makefiles and when processed asm symlink,
1038 # version.h and scripts_basic is processed / created.
1040 # Listed in dependency order
1041 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1043 # prepare3 is used to check if we are building in a separate output directory,
1044 # and if so do:
1045 # 1) Check that make has not been executed in the kernel src $(srctree)
1046 prepare3: include/config/kernel.release
1047 ifneq ($(KBUILD_SRC),)
1048 @$(kecho) ' Using $(srctree) as source for kernel'
1049 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1050 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1051 echo >&2 " in the '$(srctree)' directory.";\
1052 /bin/false; \
1054 endif
1056 # prepare2 creates a makefile if using a separate output directory.
1057 # From this point forward, .config has been reprocessed, so any rules
1058 # that need to depend on updated CONFIG_* values can be checked here.
1059 prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1061 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1062 include/config/auto.conf
1063 $(cmd_crmodverdir)
1065 archprepare: archheaders archscripts prepare1 scripts_basic
1067 prepare0: archprepare gcc-plugins
1068 $(Q)$(MAKE) $(build)=.
1070 # All the preparing..
1071 prepare: prepare0 prepare-objtool
1073 ifdef CONFIG_STACK_VALIDATION
1074 has_libelf := $(call try-run,\
1075 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
1076 ifeq ($(has_libelf),1)
1077 objtool_target := tools/objtool FORCE
1078 else
1079 $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
1080 SKIP_STACK_VALIDATION := 1
1081 export SKIP_STACK_VALIDATION
1082 endif
1083 endif
1085 PHONY += prepare-objtool
1086 prepare-objtool: $(objtool_target)
1088 # Check for CONFIG flags that require compiler support. Abort the build
1089 # after .config has been processed, but before the kernel build starts.
1091 # For security-sensitive CONFIG options, we don't want to fallback and/or
1092 # silently change which compiler flags will be used, since that leads to
1093 # producing kernels with different security feature characteristics
1094 # depending on the compiler used. (For example, "But I selected
1095 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1096 PHONY += prepare-compiler-check
1097 prepare-compiler-check: FORCE
1098 # Make sure compiler supports requested stack protector flag.
1099 ifdef stackp-name
1100 ifeq ($(call cc-option, $(stackp-flag)),)
1101 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1102 $(stackp-flag) not supported by compiler >&2 && exit 1
1103 endif
1104 endif
1105 # Make sure compiler does not have buggy stack-protector support.
1106 ifdef stackp-check
1107 ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1108 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1109 $(stackp-flag) available but compiler is broken >&2 && exit 1
1110 endif
1111 endif
1114 # Generate some files
1115 # ---------------------------------------------------------------------------
1117 # KERNELRELEASE can change from a few different places, meaning version.h
1118 # needs to be updated, so this check is forced on all builds
1120 uts_len := 64
1121 define filechk_utsrelease.h
1122 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1123 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1124 exit 1; \
1125 fi; \
1126 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1127 endef
1129 define filechk_version.h
1130 (echo \#define LINUX_VERSION_CODE $(shell \
1131 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1132 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1133 endef
1135 $(version_h): $(srctree)/Makefile FORCE
1136 $(call filechk,version.h)
1137 $(Q)rm -f $(old_version_h)
1139 include/generated/utsrelease.h: include/config/kernel.release FORCE
1140 $(call filechk,utsrelease.h)
1142 PHONY += headerdep
1143 headerdep:
1144 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1145 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1147 # ---------------------------------------------------------------------------
1148 # Firmware install
1149 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1150 export INSTALL_FW_PATH
1152 PHONY += firmware_install
1153 firmware_install:
1154 @mkdir -p $(objtree)/firmware
1155 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1157 # ---------------------------------------------------------------------------
1158 # Kernel headers
1160 #Default location for installed headers
1161 export INSTALL_HDR_PATH = $(objtree)/usr
1163 # If we do an all arch process set dst to asm-$(hdr-arch)
1164 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1166 PHONY += archheaders
1167 archheaders:
1169 PHONY += archscripts
1170 archscripts:
1172 PHONY += __headers
1173 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts
1174 $(Q)$(MAKE) $(build)=scripts build_unifdef
1176 PHONY += headers_install_all
1177 headers_install_all:
1178 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1180 PHONY += headers_install
1181 headers_install: __headers
1182 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1183 $(error Headers not exportable for the $(SRCARCH) architecture))
1184 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1185 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1187 PHONY += headers_check_all
1188 headers_check_all: headers_install_all
1189 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1191 PHONY += headers_check
1192 headers_check: headers_install
1193 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1194 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1196 # ---------------------------------------------------------------------------
1197 # Kernel selftest
1199 PHONY += kselftest
1200 kselftest:
1201 $(Q)$(MAKE) -C tools/testing/selftests run_tests
1203 kselftest-clean:
1204 $(Q)$(MAKE) -C tools/testing/selftests clean
1206 PHONY += kselftest-merge
1207 kselftest-merge:
1208 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1209 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1210 -m $(objtree)/.config \
1211 $(srctree)/tools/testing/selftests/*/config
1212 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1214 # ---------------------------------------------------------------------------
1215 # Modules
1217 ifdef CONFIG_MODULES
1219 # By default, build modules as well
1221 all: modules
1223 # Build modules
1225 # A module can be listed more than once in obj-m resulting in
1226 # duplicate lines in modules.order files. Those are removed
1227 # using awk while concatenating to the final file.
1229 PHONY += modules
1230 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1231 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1232 @$(kecho) ' Building modules, stage 2.';
1233 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1234 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1236 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1237 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1239 %/modules.builtin: include/config/auto.conf
1240 $(Q)$(MAKE) $(modbuiltin)=$*
1243 # Target to prepare building external modules
1244 PHONY += modules_prepare
1245 modules_prepare: prepare scripts
1247 # Target to install modules
1248 PHONY += modules_install
1249 modules_install: _modinst_ _modinst_post
1251 PHONY += _modinst_
1252 _modinst_:
1253 @rm -rf $(MODLIB)/kernel
1254 @rm -f $(MODLIB)/source
1255 @mkdir -p $(MODLIB)/kernel
1256 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1257 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1258 rm -f $(MODLIB)/build ; \
1259 ln -s $(CURDIR) $(MODLIB)/build ; \
1261 @cp -f $(objtree)/modules.order $(MODLIB)/
1262 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1263 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1265 # This depmod is only for convenience to give the initial
1266 # boot a modules.dep even before / is mounted read-write. However the
1267 # boot script depmod is the master version.
1268 PHONY += _modinst_post
1269 _modinst_post: _modinst_
1270 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1271 $(call cmd,depmod)
1273 ifeq ($(CONFIG_MODULE_SIG), y)
1274 PHONY += modules_sign
1275 modules_sign:
1276 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1277 endif
1279 else # CONFIG_MODULES
1281 # Modules not configured
1282 # ---------------------------------------------------------------------------
1284 PHONY += modules modules_install
1285 modules modules_install:
1286 @echo >&2
1287 @echo >&2 "The present kernel configuration has modules disabled."
1288 @echo >&2 "Type 'make config' and enable loadable module support."
1289 @echo >&2 "Then build a kernel with module support enabled."
1290 @echo >&2
1291 @exit 1
1293 endif # CONFIG_MODULES
1296 # Cleaning is done on three levels.
1297 # make clean Delete most generated files
1298 # Leave enough to build external modules
1299 # make mrproper Delete the current configuration, and all generated files
1300 # make distclean Remove editor backup files, patch leftover files and the like
1302 # Directories & files removed with 'make clean'
1303 CLEAN_DIRS += $(MODVERDIR)
1305 # Directories & files removed with 'make mrproper'
1306 MRPROPER_DIRS += include/config usr/include include/generated \
1307 arch/*/include/generated .tmp_objdiff
1308 MRPROPER_FILES += .config .config.old .version .old_version \
1309 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1310 signing_key.pem signing_key.priv signing_key.x509 \
1311 x509.genkey extra_certificates signing_key.x509.keyid \
1312 signing_key.x509.signer vmlinux-gdb.py
1314 # clean - Delete most, but leave enough to build external modules
1316 clean: rm-dirs := $(CLEAN_DIRS)
1317 clean: rm-files := $(CLEAN_FILES)
1318 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1320 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1321 $(clean-dirs):
1322 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1324 vmlinuxclean:
1325 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1326 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1328 clean: archclean vmlinuxclean
1330 # mrproper - Delete all generated files, including .config
1332 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1333 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1334 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1336 PHONY += $(mrproper-dirs) mrproper archmrproper
1337 $(mrproper-dirs):
1338 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1340 mrproper: clean archmrproper $(mrproper-dirs)
1341 $(call cmd,rmdirs)
1342 $(call cmd,rmfiles)
1344 # distclean
1346 PHONY += distclean
1348 distclean: mrproper
1349 @find $(srctree) $(RCS_FIND_IGNORE) \
1350 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1351 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1352 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
1353 -type f -print | xargs rm -f
1356 # Packaging of the kernel to various formats
1357 # ---------------------------------------------------------------------------
1358 # rpm target kept for backward compatibility
1359 package-dir := scripts/package
1361 %src-pkg: FORCE
1362 $(Q)$(MAKE) $(build)=$(package-dir) $@
1363 %pkg: include/config/kernel.release FORCE
1364 $(Q)$(MAKE) $(build)=$(package-dir) $@
1365 rpm: include/config/kernel.release FORCE
1366 $(Q)$(MAKE) $(build)=$(package-dir) $@
1369 # Brief documentation of the typical targets used
1370 # ---------------------------------------------------------------------------
1372 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1373 boards := $(sort $(notdir $(boards)))
1374 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1375 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1377 PHONY += help
1378 help:
1379 @echo 'Cleaning targets:'
1380 @echo ' clean - Remove most generated files but keep the config and'
1381 @echo ' enough build support to build external modules'
1382 @echo ' mrproper - Remove all generated files + config + various backup files'
1383 @echo ' distclean - mrproper + remove editor backup and patch files'
1384 @echo ''
1385 @echo 'Configuration targets:'
1386 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1387 @echo ''
1388 @echo 'Other generic targets:'
1389 @echo ' all - Build all targets marked with [*]'
1390 @echo '* vmlinux - Build the bare kernel'
1391 @echo '* modules - Build all modules'
1392 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1393 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1394 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1395 @echo ' dir/ - Build all files in dir and below'
1396 @echo ' dir/file.[ois] - Build specified target only'
1397 @echo ' dir/file.ll - Build the LLVM assembly file'
1398 @echo ' (requires compiler support for LLVM assembly generation)'
1399 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1400 @echo ' (requires a recent binutils and recent build (System.map))'
1401 @echo ' dir/file.ko - Build module including final link'
1402 @echo ' modules_prepare - Set up for building external modules'
1403 @echo ' tags/TAGS - Generate tags file for editors'
1404 @echo ' cscope - Generate cscope index'
1405 @echo ' gtags - Generate GNU GLOBAL index'
1406 @echo ' kernelrelease - Output the release version string (use with make -s)'
1407 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1408 @echo ' image_name - Output the image name (use with make -s)'
1409 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1410 echo ' (default: $(INSTALL_HDR_PATH))'; \
1411 echo ''
1412 @echo 'Static analysers'
1413 @echo ' checkstack - Generate a list of stack hogs'
1414 @echo ' namespacecheck - Name space analysis on compiled kernel'
1415 @echo ' versioncheck - Sanity check on version.h usage'
1416 @echo ' includecheck - Check for duplicate included header files'
1417 @echo ' export_report - List the usages of all exported symbols'
1418 @echo ' headers_check - Sanity check on exported headers'
1419 @echo ' headerdep - Detect inclusion cycles in headers'
1420 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1421 @echo ''
1422 @echo 'Kernel selftest'
1423 @echo ' kselftest - Build and run kernel selftest (run as root)'
1424 @echo ' Build, install, and boot kernel before'
1425 @echo ' running kselftest on it'
1426 @echo ' kselftest-clean - Remove all generated kselftest files'
1427 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existed'
1428 @echo ' .config.'
1429 @echo ''
1430 @echo 'Kernel packaging:'
1431 @$(MAKE) $(build)=$(package-dir) help
1432 @echo ''
1433 @echo 'Documentation targets:'
1434 @$(MAKE) -f $(srctree)/Documentation/Makefile.sphinx dochelp
1435 @echo ''
1436 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1437 @echo ''
1438 @echo 'Architecture specific targets ($(SRCARCH)):'
1439 @$(if $(archhelp),$(archhelp),\
1440 echo ' No architecture specific help defined for $(SRCARCH)')
1441 @echo ''
1442 @$(if $(boards), \
1443 $(foreach b, $(boards), \
1444 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1445 echo '')
1446 @$(if $(board-dirs), \
1447 $(foreach b, $(board-dirs), \
1448 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1449 printf " %-16s - Show all of the above\\n" help-boards; \
1450 echo '')
1452 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1453 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1454 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1455 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1456 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1457 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1458 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1459 @echo ' 1: warnings which may be relevant and do not occur too often'
1460 @echo ' 2: warnings which occur quite often but may still be relevant'
1461 @echo ' 3: more obscure warnings, can most likely be ignored'
1462 @echo ' Multiple levels can be combined with W=12 or W=123'
1463 @echo ''
1464 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1465 @echo 'For further info see the ./README file'
1468 help-board-dirs := $(addprefix help-,$(board-dirs))
1470 help-boards: $(help-board-dirs)
1472 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1474 $(help-board-dirs): help-%:
1475 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1476 @$(if $(boards-per-dir), \
1477 $(foreach b, $(boards-per-dir), \
1478 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1479 echo '')
1482 # Documentation targets
1483 # ---------------------------------------------------------------------------
1484 DOC_TARGETS := xmldocs sgmldocs psdocs latexdocs pdfdocs htmldocs mandocs installmandocs epubdocs cleandocs
1485 PHONY += $(DOC_TARGETS)
1486 $(DOC_TARGETS): scripts_basic FORCE
1487 $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1488 $(Q)$(MAKE) $(build)=Documentation -f $(srctree)/Documentation/Makefile.sphinx $@
1489 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1491 else # KBUILD_EXTMOD
1494 # External module support.
1495 # When building external modules the kernel used as basis is considered
1496 # read-only, and no consistency checks are made and the make
1497 # system is not used on the basis kernel. If updates are required
1498 # in the basis kernel ordinary make commands (without M=...) must
1499 # be used.
1501 # The following are the only valid targets when building external
1502 # modules.
1503 # make M=dir clean Delete all automatically generated files
1504 # make M=dir modules Make all modules in specified dir
1505 # make M=dir Same as 'make M=dir modules'
1506 # make M=dir modules_install
1507 # Install the modules built in the module directory
1508 # Assumes install directory is already created
1510 # We are always building modules
1511 KBUILD_MODULES := 1
1512 PHONY += crmodverdir
1513 crmodverdir:
1514 $(cmd_crmodverdir)
1516 PHONY += $(objtree)/Module.symvers
1517 $(objtree)/Module.symvers:
1518 @test -e $(objtree)/Module.symvers || ( \
1519 echo; \
1520 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1521 echo " is missing; modules will have no dependencies and modversions."; \
1522 echo )
1524 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1525 PHONY += $(module-dirs) modules
1526 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1527 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1529 modules: $(module-dirs)
1530 @$(kecho) ' Building modules, stage 2.';
1531 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1533 PHONY += modules_install
1534 modules_install: _emodinst_ _emodinst_post
1536 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1537 PHONY += _emodinst_
1538 _emodinst_:
1539 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1540 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1542 PHONY += _emodinst_post
1543 _emodinst_post: _emodinst_
1544 $(call cmd,depmod)
1546 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1548 PHONY += $(clean-dirs) clean
1549 $(clean-dirs):
1550 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1552 clean: rm-dirs := $(MODVERDIR)
1553 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1555 PHONY += help
1556 help:
1557 @echo ' Building external modules.'
1558 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1559 @echo ''
1560 @echo ' modules - default target, build the module(s)'
1561 @echo ' modules_install - install the module'
1562 @echo ' clean - remove generated files in module directory only'
1563 @echo ''
1565 # Dummies...
1566 PHONY += prepare scripts
1567 prepare: ;
1568 scripts: ;
1569 endif # KBUILD_EXTMOD
1571 clean: $(clean-dirs)
1572 $(call cmd,rmdirs)
1573 $(call cmd,rmfiles)
1574 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1575 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1576 -o -name '*.ko.*' \
1577 -o -name '*.dwo' \
1578 -o -name '*.su' \
1579 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1580 -o -name '*.symtypes' -o -name 'modules.order' \
1581 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1582 -o -name '*.c.[012]*.*' \
1583 -o -name '*.ll' \
1584 -o -name '*.gcno' \) -type f -print | xargs rm -f
1586 # Generate tags for editors
1587 # ---------------------------------------------------------------------------
1588 quiet_cmd_tags = GEN $@
1589 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1591 tags TAGS cscope gtags: FORCE
1592 $(call cmd,tags)
1594 # Scripts to check various things for consistency
1595 # ---------------------------------------------------------------------------
1597 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1599 includecheck:
1600 find $(srctree)/* $(RCS_FIND_IGNORE) \
1601 -name '*.[hcS]' -type f -print | sort \
1602 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1604 versioncheck:
1605 find $(srctree)/* $(RCS_FIND_IGNORE) \
1606 -name '*.[hcS]' -type f -print | sort \
1607 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1609 coccicheck:
1610 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1612 namespacecheck:
1613 $(PERL) $(srctree)/scripts/namespace.pl
1615 export_report:
1616 $(PERL) $(srctree)/scripts/export_report.pl
1618 endif #ifeq ($(config-targets),1)
1619 endif #ifeq ($(mixed-targets),1)
1621 PHONY += checkstack kernelrelease kernelversion image_name
1623 # UML needs a little special treatment here. It wants to use the host
1624 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1625 # else wants $(ARCH), including people doing cross-builds, which means
1626 # that $(SUBARCH) doesn't work here.
1627 ifeq ($(ARCH), um)
1628 CHECKSTACK_ARCH := $(SUBARCH)
1629 else
1630 CHECKSTACK_ARCH := $(ARCH)
1631 endif
1632 checkstack:
1633 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1634 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1636 kernelrelease:
1637 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1639 kernelversion:
1640 @echo $(KERNELVERSION)
1642 image_name:
1643 @echo $(KBUILD_IMAGE)
1645 # Clear a bunch of variables before executing the submake
1646 tools/: FORCE
1647 $(Q)mkdir -p $(objtree)/tools
1648 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1650 tools/%: FORCE
1651 $(Q)mkdir -p $(objtree)/tools
1652 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1654 # Single targets
1655 # ---------------------------------------------------------------------------
1656 # Single targets are compatible with:
1657 # - build with mixed source and output
1658 # - build with separate output dir 'make O=...'
1659 # - external modules
1661 # target-dir => where to store outputfile
1662 # build-dir => directory in kernel source tree to use
1664 ifeq ($(KBUILD_EXTMOD),)
1665 build-dir = $(patsubst %/,%,$(dir $@))
1666 target-dir = $(dir $@)
1667 else
1668 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1669 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1670 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1671 endif
1673 %.s: %.c prepare scripts FORCE
1674 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1675 %.i: %.c prepare scripts FORCE
1676 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1677 %.o: %.c prepare scripts FORCE
1678 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1679 %.lst: %.c prepare scripts FORCE
1680 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1681 %.s: %.S prepare scripts FORCE
1682 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1683 %.o: %.S prepare scripts FORCE
1684 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1685 %.symtypes: %.c prepare scripts FORCE
1686 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1687 %.ll: %.c prepare scripts FORCE
1688 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1690 # Modules
1691 /: prepare scripts FORCE
1692 $(cmd_crmodverdir)
1693 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1694 $(build)=$(build-dir)
1695 # Make sure the latest headers are built for Documentation
1696 Documentation/ samples/: headers_install
1697 %/: prepare scripts FORCE
1698 $(cmd_crmodverdir)
1699 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1700 $(build)=$(build-dir)
1701 %.ko: prepare scripts FORCE
1702 $(cmd_crmodverdir)
1703 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1704 $(build)=$(build-dir) $(@:.ko=.o)
1705 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1707 # FIXME Should go into a make.lib or something
1708 # ===========================================================================
1710 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1711 cmd_rmdirs = rm -rf $(rm-dirs)
1713 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1714 cmd_rmfiles = rm -f $(rm-files)
1716 # Run depmod only if we have System.map and depmod is executable
1717 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1718 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1719 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1721 # Create temporary dir for module support files
1722 # clean it up only when building all modules
1723 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1724 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1726 # read all saved command lines
1728 targets := $(wildcard $(sort $(targets)))
1729 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1731 ifneq ($(cmd_files),)
1732 $(cmd_files): ; # Do not try to update included dependency files
1733 include $(cmd_files)
1734 endif
1736 endif # skip-makefile
1738 PHONY += FORCE
1739 FORCE:
1741 # Declare the contents of the .PHONY variable as phony. We keep that
1742 # information in a variable so we can use it in if_changed and friends.
1743 .PHONY: $(PHONY)