5 NAME = Man-Eating Seals of Antiquity
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.
14 # o use make's built-in rules and variables
15 # (this increases performance and avoids hard-to-debug behaviour);
16 # o print "Entering directory ...";
17 MAKEFLAGS += -rR --no-print-directory
19 # Avoid funny character set dependencies
24 export LC_ALL LC_CTYPE LC_COLLATE LC_NUMERIC
26 # We are using a recursive build, so we need to do a little thinking
27 # to get the ordering right.
29 # Most importantly: sub-Makefiles should only ever modify files in
30 # their own directory. If in some directory we have a dependency on
31 # a file in another dir (which doesn't happen often, but it's often
32 # unavoidable when linking the built-in.o targets which finally
33 # turn into vmlinux), we will call a sub make in that other dir, and
34 # after that we are sure that everything which is in that other dir
37 # The only cases where we need to modify files which have global
38 # effects are thus separated out and done before the recursive
39 # descending is started. They are now explicitly listed as the
42 # To put more focus on warnings, be less verbose as default
43 # Use 'make V=1' to see the full commands
45 ifeq ("$(origin V)", "command line")
52 # Call a source code checker (by default, "sparse") as part of the
55 # Use 'make C=1' to enable checking of only re-compiled files.
56 # Use 'make C=2' to enable checking of *all* source files, regardless
57 # of whether they are re-compiled or not.
59 # See the file "Documentation/sparse.txt" for more details, including
60 # where to get the "sparse" utility.
62 ifeq ("$(origin C)", "command line")
63 KBUILD_CHECKSRC = $(C)
65 ifndef KBUILD_CHECKSRC
69 # Use make M=dir to specify directory of external module to build
70 # Old syntax make ... SUBDIRS=$PWD is still supported
71 # Setting the environment variable KBUILD_EXTMOD take precedence
73 KBUILD_EXTMOD ?= $(SUBDIRS)
76 ifeq ("$(origin M)", "command line")
80 # kbuild supports saving output files in a separate directory.
81 # To locate output files in a separate directory two syntaxes are supported.
82 # In both cases the working directory must be the root of the kernel src.
84 # Use "make O=dir/to/store/output/files/"
86 # 2) Set KBUILD_OUTPUT
87 # Set the environment variable KBUILD_OUTPUT to point to the directory
88 # where the output files shall be placed.
89 # export KBUILD_OUTPUT=dir/to/store/output/files/
92 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
96 # KBUILD_SRC is set on invocation of make in OBJ directory
97 # KBUILD_SRC is not intended to be used by the regular user (for now)
100 # OK, Make called in directory where kernel src resides
101 # Do we want to locate output files in a separate directory?
102 ifeq ("$(origin O)", "command line")
103 KBUILD_OUTPUT := $(O)
106 # That's our default target when none is given on the command line
110 # Cancel implicit rules on top Makefile
111 $(CURDIR)/Makefile Makefile: ;
113 ifneq ($(KBUILD_OUTPUT),)
114 # Invoke a second make in the output directory, passing relevant variables
115 # check that the output directory actually exists
116 saved-output := $(KBUILD_OUTPUT)
117 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
118 $(if $(KBUILD_OUTPUT),, \
119 $(error output directory "$(saved-output)" does not exist))
121 PHONY += $(MAKECMDGOALS) sub-make
123 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
127 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
128 KBUILD_SRC=$(CURDIR) \
129 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
130 $(filter-out _all sub-make,$(MAKECMDGOALS))
132 # Leave processing to above invocation of make
134 endif # ifneq ($(KBUILD_OUTPUT),)
135 endif # ifeq ($(KBUILD_SRC),)
137 # We process the rest of the Makefile if this is the final invocation of make
138 ifeq ($(skip-makefile),)
140 # If building an external module we do not care about the all: rule
141 # but instead _all depend on modules
143 ifeq ($(KBUILD_EXTMOD),)
149 srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
154 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
156 export srctree objtree VPATH
159 # SUBARCH tells the usermode build what the underlying arch is. That is set
160 # first, and if a usermode build is happening, the "ARCH=um" on the command
161 # line overrides the setting of ARCH below. If a native build is happening,
162 # then ARCH is assigned, getting whatever value it gets normally, and
163 # SUBARCH is subsequently ignored.
165 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
166 -e s/arm.*/arm/ -e s/sa110/arm/ \
167 -e s/s390x/s390/ -e s/parisc64/parisc/ \
168 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
171 # Cross compiling and selecting different set of gcc/bin-utils
172 # ---------------------------------------------------------------------------
174 # When performing cross compilation for other architectures ARCH shall be set
175 # to the target architecture. (See arch/* for the possibilities).
176 # ARCH can be set during invocation of make:
178 # Another way is to have ARCH set in the environment.
179 # The default ARCH is the host where make is executed.
181 # CROSS_COMPILE specify the prefix used for all executables used
182 # during compilation. Only gcc and related bin-utils executables
183 # are prefixed with $(CROSS_COMPILE).
184 # CROSS_COMPILE can be set on the command line
185 # make CROSS_COMPILE=ia64-linux-
186 # Alternatively CROSS_COMPILE can be set in the environment.
187 # Default value for CROSS_COMPILE is not to prefix executables
188 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
189 export KBUILD_BUILDHOST := $(SUBARCH)
193 # Architecture as present in compile.h
194 UTS_MACHINE := $(ARCH)
197 # Additional ARCH settings for x86
201 ifeq ($(ARCH),x86_64)
205 # Additional ARCH settings for sparc
206 ifeq ($(ARCH),sparc64)
210 # Additional ARCH settings for sh
215 # Where to locate arch specific headers
216 hdr-arch := $(SRCARCH)
218 ifeq ($(ARCH),m68knommu)
222 KCONFIG_CONFIG ?= .config
224 # SHELL used by kbuild
225 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
226 else if [ -x /bin/bash ]; then echo /bin/bash; \
227 else echo sh; fi ; fi)
231 HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
234 # Decide whether to build built-in, modular, or both.
235 # Normally, just do built-in.
240 # If we have only "make modules", don't compile built-in objects.
241 # When we're building modules with modversions, we need to consider
242 # the built-in objects during the descend as well, in order to
243 # make sure the checksums are up to date before we record them.
245 ifeq ($(MAKECMDGOALS),modules)
246 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
249 # If we have "make <whatever> modules", compile modules
250 # in addition to whatever we do anyway.
251 # Just "make" or "make all" shall build modules as well
253 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
257 ifeq ($(MAKECMDGOALS),)
261 export KBUILD_MODULES KBUILD_BUILTIN
262 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
265 # ---------------------------------------------------------------------------
267 # Normally, we echo the whole command before executing it. By making
268 # that echo $($(quiet)$(cmd)), we now have the possibility to set
269 # $(quiet) to choose other forms of output instead, e.g.
271 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
272 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
274 # If $(quiet) is empty, the whole command will be printed.
275 # If it is set to "quiet_", only the short version will be printed.
276 # If it is set to "silent_", nothing will be printed at all, since
277 # the variable $(silent_cmd_cc_o_c) doesn't exist.
279 # A simple variant is to prefix commands with $(Q) - that's useful
280 # for commands that shall be hidden in non-verbose mode.
284 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
285 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
287 ifeq ($(KBUILD_VERBOSE),1)
295 # If the user is running make -s (silent mode), suppress echoing of
298 ifneq ($(findstring s,$(MAKEFLAGS)),)
302 export quiet Q KBUILD_VERBOSE
305 # Look for make include files relative to root of kernel src
306 MAKEFLAGS += --include-dir=$(srctree)
308 # We need some generic definitions (do not try to remake the file).
309 $(srctree)/scripts/Kbuild.include: ;
310 include $(srctree)/scripts/Kbuild.include
312 # Make variables (CC, etc...)
314 AS = $(CROSS_COMPILE)as
315 LD = $(CROSS_COMPILE)ld
316 CC = $(CROSS_COMPILE)gcc
318 AR = $(CROSS_COMPILE)ar
319 NM = $(CROSS_COMPILE)nm
320 STRIP = $(CROSS_COMPILE)strip
321 OBJCOPY = $(CROSS_COMPILE)objcopy
322 OBJDUMP = $(CROSS_COMPILE)objdump
324 GENKSYMS = scripts/genksyms/genksyms
325 INSTALLKERNEL := installkernel
326 DEPMOD = /sbin/depmod
327 KALLSYMS = scripts/kallsyms
331 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
332 -Wbitwise -Wno-return-void $(CF)
334 CFLAGS_MODULE = $(MODFLAGS)
335 AFLAGS_MODULE = $(MODFLAGS)
336 LDFLAGS_MODULE = -T $(srctree)/scripts/module-common.lds
339 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
342 # Use LINUXINCLUDE when you must reference the include/ directory.
343 # Needed to be compatible with the O= option
344 LINUXINCLUDE := -Iinclude \
345 $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
346 -I$(srctree)/arch/$(hdr-arch)/include \
347 -include include/linux/autoconf.h
349 KBUILD_CPPFLAGS := -D__KERNEL__
351 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
352 -fno-strict-aliasing -fno-common \
353 -Werror-implicit-function-declaration \
354 -Wno-format-security \
355 -fno-delete-null-pointer-checks
356 KBUILD_AFLAGS := -D__ASSEMBLY__
358 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
359 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
360 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
362 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
363 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
364 export CPP AR NM STRIP OBJCOPY OBJDUMP
365 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
366 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
368 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
369 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
370 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
372 # When compiling out-of-tree modules, put MODVERDIR in the module
373 # tree rather than in the kernel tree. The kernel tree might
375 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
377 # Files to ignore in find ... statements
379 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
380 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
382 # ===========================================================================
383 # Rules shared between *config targets and build targets
385 # Basic helpers built in scripts/
386 PHONY += scripts_basic
388 $(Q)$(MAKE) $(build)=scripts/basic
389 $(Q)rm -f .tmp_quiet_recordmcount
391 # To avoid any implicit rule to kick in, define an empty command.
392 scripts/basic/%: scripts_basic ;
394 PHONY += outputmakefile
395 # outputmakefile generates a Makefile in the output directory, if using a
396 # separate output directory. This allows convenient use of make in the
399 ifneq ($(KBUILD_SRC),)
400 $(Q)ln -fsn $(srctree) source
401 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
402 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
405 # To make sure we do not include .config for any of the *config targets
406 # catch them early, and hand them over to scripts/kconfig/Makefile
407 # It is allowed to specify more targets when calling make, including
408 # mixing *config targets and build targets.
409 # For example 'make oldconfig all'.
410 # Detect when mixed targets is specified, and make a second invocation
411 # of make so .config is not included in this case either (for *config).
413 no-dot-config-targets := clean mrproper distclean \
414 cscope TAGS tags help %docs check% \
415 include/linux/version.h headers_% \
416 kernelrelease kernelversion
422 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
423 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
428 ifeq ($(KBUILD_EXTMOD),)
429 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
431 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
437 ifeq ($(mixed-targets),1)
438 # ===========================================================================
439 # We're called with mixed targets (*config and build targets).
440 # Handle them one by one.
443 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
446 ifeq ($(config-targets),1)
447 # ===========================================================================
448 # *config targets only - make sure prerequisites are updated, and descend
449 # in scripts/kconfig to make the *config target
451 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
452 # KBUILD_DEFCONFIG may point out an alternative default configuration
453 # used for 'make defconfig'
454 include $(srctree)/arch/$(SRCARCH)/Makefile
455 export KBUILD_DEFCONFIG KBUILD_KCONFIG
457 config: scripts_basic outputmakefile FORCE
458 $(Q)mkdir -p include/linux include/config
459 $(Q)$(MAKE) $(build)=scripts/kconfig $@
461 %config: scripts_basic outputmakefile FORCE
462 $(Q)mkdir -p include/linux include/config
463 $(Q)$(MAKE) $(build)=scripts/kconfig $@
466 # ===========================================================================
467 # Build targets only - this includes vmlinux, arch specific targets, clean
468 # targets and others. In general all targets except *config targets.
470 ifeq ($(KBUILD_EXTMOD),)
471 # Additional helpers built in scripts/
472 # Carefully list dependencies so we do not try to build scripts twice
475 scripts: scripts_basic include/config/auto.conf
476 $(Q)$(MAKE) $(build)=$(@)
478 # Objects we will link into vmlinux / subdirs we need to visit
480 drivers-y := drivers/ sound/ firmware/
484 endif # KBUILD_EXTMOD
486 ifeq ($(dot-config),1)
488 -include include/config/auto.conf
490 ifeq ($(KBUILD_EXTMOD),)
491 # Read in dependencies to all Kconfig* files, make sure to run
492 # oldconfig if changes are detected.
493 -include include/config/auto.conf.cmd
495 # To avoid any implicit rule to kick in, define an empty command
496 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
498 # If .config is newer than include/config/auto.conf, someone tinkered
499 # with it and forgot to run make oldconfig.
500 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
501 # we execute the config step to be sure to catch updated Kconfig files
502 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
503 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
505 # external modules needs include/linux/autoconf.h and include/config/auto.conf
506 # but do not care if they are up-to-date. Use auto.conf to trigger the test
507 PHONY += include/config/auto.conf
509 include/config/auto.conf:
510 $(Q)test -e include/linux/autoconf.h -a -e $@ || ( \
512 echo " ERROR: Kernel configuration is invalid."; \
513 echo " include/linux/autoconf.h or $@ are missing."; \
514 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
518 endif # KBUILD_EXTMOD
521 # Dummy target needed, because used as prerequisite
522 include/config/auto.conf: ;
523 endif # $(dot-config)
525 # The all: target is the default when no target is given on the
527 # This allow a user to issue only 'make' to build a kernel including modules
528 # Defaults vmlinux but it is usually overridden in the arch makefile
531 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
537 include $(srctree)/arch/$(SRCARCH)/Makefile
539 ifneq ($(CONFIG_FRAME_WARN),0)
540 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
543 # Force gcc to behave correct even for buggy distributions
544 ifndef CONFIG_CC_STACKPROTECTOR
545 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
548 ifdef CONFIG_FRAME_POINTER
549 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
551 KBUILD_CFLAGS += -fomit-frame-pointer
554 ifdef CONFIG_DEBUG_INFO
556 KBUILD_AFLAGS += -gdwarf-2
559 ifdef CONFIG_FUNCTION_TRACER
563 # We trigger additional mismatches with less inlining
564 ifdef CONFIG_DEBUG_SECTION_MISMATCH
565 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
568 # arch Makefile may override CC so keep this after arch Makefile is included
569 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
570 CHECKFLAGS += $(NOSTDINC_FLAGS)
572 # warn about C99 declaration after statement
573 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
575 # disable pointer signed / unsigned warnings in gcc 4.0
576 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
578 # disable invalid "can't wrap" optimizations for signed / pointers
579 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
581 # revert to pre-gcc-4.4 behaviour of .eh_frame
582 KBUILD_CFLAGS += $(call cc-option,-fno-dwarf2-cfi-asm)
584 # conserve stack if available
585 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
587 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
588 # But warn user when we do so
590 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
592 ifneq ($(KCPPFLAGS),)
593 $(call warn-assign,CPPFLAGS)
594 KBUILD_CPPFLAGS += $(KCPPFLAGS)
597 $(call warn-assign,AFLAGS)
598 KBUILD_AFLAGS += $(KAFLAGS)
601 $(call warn-assign,CFLAGS)
602 KBUILD_CFLAGS += $(KCFLAGS)
605 # Use --build-id when available.
606 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
607 $(call cc-ldoption, -Wl$(comma)--build-id,))
608 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
609 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
611 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
612 LDFLAGS_vmlinux += $(call ld-option, -X,)
615 # Default kernel image to build when no specific target is given.
616 # KBUILD_IMAGE may be overruled on the command line or
617 # set in the environment
618 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
620 export KBUILD_IMAGE ?= vmlinux
623 # INSTALL_PATH specifies where to place the updated kernel and system map
624 # images. Default is /boot, but you can set it to other values
625 export INSTALL_PATH ?= /boot
628 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
629 # relocations required by build roots. This is not defined in the
630 # makefile but the argument can be passed to make if needed.
633 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
637 # INSTALL_MOD_STRIP, if defined, will cause modules to be
638 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
639 # the default option --strip-debug will be used. Otherwise,
640 # INSTALL_MOD_STRIP will used as the options to the strip command.
642 ifdef INSTALL_MOD_STRIP
643 ifeq ($(INSTALL_MOD_STRIP),1)
644 mod_strip_cmd = $(STRIP) --strip-debug
646 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
647 endif # INSTALL_MOD_STRIP=1
650 endif # INSTALL_MOD_STRIP
654 ifeq ($(KBUILD_EXTMOD),)
655 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
657 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
658 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
659 $(net-y) $(net-m) $(libs-y) $(libs-m)))
661 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
663 $(core-n) $(core-) $(drivers-n) $(drivers-) \
664 $(net-n) $(net-) $(libs-n) $(libs-))))
666 init-y := $(patsubst %/, %/built-in.o, $(init-y))
667 core-y := $(patsubst %/, %/built-in.o, $(core-y))
668 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
669 net-y := $(patsubst %/, %/built-in.o, $(net-y))
670 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
671 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
672 libs-y := $(libs-y1) $(libs-y2)
675 # ---------------------------------------------------------------------------
676 # vmlinux is built from the objects selected by $(vmlinux-init) and
677 # $(vmlinux-main). Most are built-in.o files from top-level directories
678 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
679 # Ordering when linking is important, and $(vmlinux-init) must be first.
684 # +-< $(vmlinux-init)
685 # | +--< init/version.o + more
687 # +--< $(vmlinux-main)
688 # | +--< driver/built-in.o mm/built-in.o + more
690 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
692 # vmlinux version (uname -v) cannot be updated during normal
693 # descending-into-subdirs phase since we do not yet know if we need to
695 # Therefore this step is delayed until just before final link of vmlinux -
696 # except in the kallsyms case where it is done just before adding the
697 # symbols to the kernel.
699 # System.map is generated to document addresses of all kernel symbols
701 vmlinux-init := $(head-y) $(init-y)
702 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
703 vmlinux-all := $(vmlinux-init) $(vmlinux-main)
704 vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
705 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
707 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
708 # May be overridden by arch/$(ARCH)/Makefile
709 quiet_cmd_vmlinux__ ?= LD $@
710 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
711 -T $(vmlinux-lds) $(vmlinux-init) \
712 --start-group $(vmlinux-main) --end-group \
713 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
715 # Generate new vmlinux version
716 quiet_cmd_vmlinux_version = GEN .version
717 cmd_vmlinux_version = set -e; \
718 if [ ! -r .version ]; then \
722 mv .version .old_version; \
723 expr 0$$(cat .old_version) + 1 >.version; \
725 $(MAKE) $(build)=init
727 # Generate System.map
728 quiet_cmd_sysmap = SYSMAP
729 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
732 # If CONFIG_KALLSYMS is set .version is already updated
733 # Generate System.map and verify that the content is consistent
734 # Use + in front of the vmlinux_version rule to silent warning with make -j2
735 # First command is ':' to allow us to use + in front of the rule
736 define rule_vmlinux__
738 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
740 $(call cmd,vmlinux__)
741 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
743 $(Q)$(if $($(quiet)cmd_sysmap), \
744 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
745 $(cmd_sysmap) $@ System.map; \
746 if [ $$? -ne 0 ]; then \
754 ifdef CONFIG_KALLSYMS
755 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
756 # It's a three stage process:
757 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
759 # Running kallsyms on that gives us .tmp_kallsyms1.o with
760 # the right size - vmlinux version (uname -v) is updated during this step
761 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
762 # but due to the added section, some addresses have shifted.
763 # From here, we generate a correct .tmp_kallsyms2.o
764 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
765 # o Verify that the System.map from vmlinux matches the map from
766 # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
767 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
768 # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
769 # temporary bypass to allow the kernel to be built while the
770 # maintainers work out what went wrong with kallsyms.
772 ifdef CONFIG_KALLSYMS_EXTRA_PASS
778 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
780 define verify_kallsyms
781 $(Q)$(if $($(quiet)cmd_sysmap), \
782 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
783 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
784 $(Q)cmp -s System.map .tmp_System.map || \
785 (echo Inconsistent kallsyms data; \
786 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
787 rm .tmp_kallsyms* ; /bin/false )
790 # Update vmlinux version before link
791 # Use + in front of this rule to silent warning about make -j1
792 # First command is ':' to allow us to use + in front of this rule
793 cmd_ksym_ld = $(cmd_vmlinux__)
796 +$(call cmd,vmlinux_version)
797 $(call cmd,vmlinux__)
798 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
801 # Generate .S file with all kernel symbols
802 quiet_cmd_kallsyms = KSYM $@
803 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
804 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
806 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
807 $(call if_changed_dep,as_o_S)
809 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
812 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
813 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
814 $(call if_changed_rule,ksym_ld)
816 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
817 $(call if_changed,vmlinux__)
819 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
820 $(call if_changed,vmlinux__)
822 # Needs to visit scripts/ before $(KALLSYMS) can be used.
823 $(KALLSYMS): scripts ;
825 # Generate some data for debugging strange kallsyms problems
826 debug_kallsyms: .tmp_map$(last_kallsyms)
828 .tmp_map%: .tmp_vmlinux% FORCE
829 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
835 endif # ifdef CONFIG_KALLSYMS
837 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
838 # relevant sections renamed as per the linker script.
839 quiet_cmd_vmlinux-modpost = LD $@
840 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
841 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
842 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
843 define rule_vmlinux-modpost
845 +$(call cmd,vmlinux-modpost)
846 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
847 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
850 # vmlinux image - including updated kernel symbols
851 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
852 ifdef CONFIG_HEADERS_CHECK
853 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
856 $(Q)$(MAKE) $(build)=samples
858 ifdef CONFIG_BUILD_DOCSRC
859 $(Q)$(MAKE) $(build)=Documentation
861 $(call vmlinux-modpost)
862 $(call if_changed_rule,vmlinux__)
863 $(Q)rm -f .old_version
865 # build vmlinux.o first to catch section mismatch errors early
866 ifdef CONFIG_KALLSYMS
867 .tmp_vmlinux1: vmlinux.o
870 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
871 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
872 $(call if_changed_rule,vmlinux-modpost)
874 # The actual objects are generated when descending,
875 # make sure no implicit rule kicks in
876 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
878 # Handle descending into subdirectories listed in $(vmlinux-dirs)
879 # Preset locale variables to speed up the build process. Limit locale
880 # tweaks to this spot to avoid wrong language settings when running
881 # make menuconfig etc.
882 # Error messages still appears in the original language
884 PHONY += $(vmlinux-dirs)
885 $(vmlinux-dirs): prepare scripts
886 $(Q)$(MAKE) $(build)=$@
888 # Build the kernel release string
890 # The KERNELRELEASE value built here is stored in the file
891 # include/config/kernel.release, and is used when executing several
892 # make targets, such as "make install" or "make modules_install."
894 # The eventual kernel release string consists of the following fields,
895 # shown in a hierarchical format to show how smaller parts are concatenated
896 # to form the larger and final value, with values coming from places like
897 # the Makefile, kernel config options, make command line options and/or
898 # SCM tag information.
902 # $(PATCHLEVEL) eg, 6
904 # $(EXTRAVERSION) eg, -rc6
907 # localversion* (files without backups, containing '~')
908 # $(CONFIG_LOCALVERSION) (from kernel config setting)
909 # $(localver-auto) (only if CONFIG_LOCALVERSION_AUTO is set)
910 # ./scripts/setlocalversion (SCM tag, if one exists)
911 # $(LOCALVERSION) (from make command line if provided)
913 # Note how the final $(localver-auto) string is included *only* if the
914 # kernel config option CONFIG_LOCALVERSION_AUTO is selected. Also, at the
915 # moment, only git is supported but other SCMs can edit the script
916 # scripts/setlocalversion and add the appropriate checks as needed.
918 pattern = ".*/localversion[^~]*"
919 string = $(shell cat /dev/null \
920 `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
922 localver = $(subst $(space),, $(string) \
923 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
925 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
926 # and if the SCM is know a tag from the SCM is appended.
927 # The appended tag is determined by the SCM used.
929 # .scmversion is used when generating rpm packages so we do not loose
930 # the version information from the SCM when we do the build of the kernel
931 # from the copied source
932 ifdef CONFIG_LOCALVERSION_AUTO
934 ifeq ($(wildcard .scmversion),)
935 _localver-auto = $(shell $(CONFIG_SHELL) \
936 $(srctree)/scripts/setlocalversion $(srctree))
938 _localver-auto = $(shell cat .scmversion 2> /dev/null)
941 localver-auto = $(LOCALVERSION)$(_localver-auto)
944 localver-full = $(localver)$(localver-auto)
946 # Store (new) KERNELRELASE string in include/config/kernel.release
947 kernelrelease = $(KERNELVERSION)$(localver-full)
948 include/config/kernel.release: include/config/auto.conf FORCE
950 $(Q)echo $(kernelrelease) > $@
953 # Things we need to do before we recursively start building the kernel
954 # or the modules are listed in "prepare".
955 # A multi level approach is used. prepareN is processed before prepareN-1.
956 # archprepare is used in arch Makefiles and when processed asm symlink,
957 # version.h and scripts_basic is processed / created.
959 # Listed in dependency order
960 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
962 # prepare3 is used to check if we are building in a separate output directory,
964 # 1) Check that make has not been executed in the kernel src $(srctree)
965 # 2) Create the include2 directory, used for the second asm symlink
966 prepare3: include/config/kernel.release
967 ifneq ($(KBUILD_SRC),)
968 @$(kecho) ' Using $(srctree) as source for kernel'
969 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
970 echo " $(srctree) is not clean, please run 'make mrproper'";\
971 echo " in the '$(srctree)' directory.";\
974 $(Q)if [ ! -d include2 ]; then \
976 ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm; \
980 # prepare2 creates a makefile if using a separate output directory
981 prepare2: prepare3 outputmakefile
983 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
984 include/asm include/config/auto.conf
987 archprepare: prepare1 scripts_basic
989 prepare0: archprepare FORCE
990 $(Q)$(MAKE) $(build)=.
991 $(Q)$(MAKE) $(build)=. missing-syscalls
993 # All the preparing..
996 # The asm symlink changes when $(ARCH) changes.
997 # Detect this and ask user to run make mrproper
998 # If asm is a stale symlink (point to dir that does not exist) remove it
1001 if [ -L include/asm ]; then \
1002 asmlink=`readlink include/asm | cut -d '-' -f 2`; \
1003 if [ "$$asmlink" != "$(SRCARCH)" ]; then \
1004 echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
1005 echo " set ARCH or save .config and run 'make mrproper' to fix it"; \
1008 test -e $$asmlink || rm include/asm; \
1009 elif [ -d include/asm ]; then \
1010 echo "ERROR: $@ is a directory but a symlink was expected";\
1015 # We create the target directory of the symlink if it does
1016 # not exist so the test in check-symlink works and we have a
1017 # directory for generated filesas used by some architectures.
1018 define create-symlink
1019 if [ ! -L include/asm ]; then \
1020 $(kecho) ' SYMLINK $@ -> include/asm-$(SRCARCH)'; \
1021 if [ ! -d include/asm-$(SRCARCH) ]; then \
1022 mkdir -p include/asm-$(SRCARCH); \
1024 ln -fsn asm-$(SRCARCH) $@; \
1029 $(Q)$(check-symlink)
1030 $(Q)$(create-symlink)
1032 # Generate some files
1033 # ---------------------------------------------------------------------------
1035 # KERNELRELEASE can change from a few different places, meaning version.h
1036 # needs to be updated, so this check is forced on all builds
1039 define filechk_utsrelease.h
1040 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1041 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1044 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1047 define filechk_version.h
1048 (echo \#define LINUX_VERSION_CODE $(shell \
1049 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1050 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1053 include/linux/version.h: $(srctree)/Makefile FORCE
1054 $(call filechk,version.h)
1056 include/linux/utsrelease.h: include/config/kernel.release FORCE
1057 $(call filechk,utsrelease.h)
1061 $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
1063 # ---------------------------------------------------------------------------
1067 @echo '*** Warning: make $@ is unnecessary now.'
1069 # ---------------------------------------------------------------------------
1071 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1072 export INSTALL_FW_PATH
1074 PHONY += firmware_install
1075 firmware_install: FORCE
1076 @mkdir -p $(objtree)/firmware
1077 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1079 # ---------------------------------------------------------------------------
1082 #Default location for installed headers
1083 export INSTALL_HDR_PATH = $(objtree)/usr
1085 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1086 # Find out where the Kbuild file is located to support
1087 # arch/$(ARCH)/include/asm
1089 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild), \
1090 arch/$(hdr-arch)/include/asm, include/asm-$(hdr-arch)))
1092 # If we do an all arch process set dst to asm-$(hdr-arch)
1093 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1096 __headers: include/linux/version.h scripts_basic FORCE
1097 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1099 PHONY += headers_install_all
1100 headers_install_all:
1101 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1103 PHONY += headers_install
1104 headers_install: __headers
1105 $(if $(wildcard $(srctree)/$(hdr-dir)/Kbuild),, \
1106 $(error Headers not exportable for the $(SRCARCH) architecture))
1107 $(Q)$(MAKE) $(hdr-inst)=include
1108 $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst)
1110 PHONY += headers_check_all
1111 headers_check_all: headers_install_all
1112 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1114 PHONY += headers_check
1115 headers_check: headers_install
1116 $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1117 $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst) HDRCHECK=1
1119 # ---------------------------------------------------------------------------
1122 ifdef CONFIG_MODULES
1124 # By default, build modules as well
1130 # A module can be listed more than once in obj-m resulting in
1131 # duplicate lines in modules.order files. Those are removed
1132 # using awk while concatenating to the final file.
1135 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1136 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1137 @$(kecho) ' Building modules, stage 2.';
1138 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1139 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1142 # Target to prepare building external modules
1143 PHONY += modules_prepare
1144 modules_prepare: prepare scripts
1146 # Target to install modules
1147 PHONY += modules_install
1148 modules_install: _modinst_ _modinst_post
1152 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1153 echo "Warning: you may need to install module-init-tools"; \
1154 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1157 @rm -rf $(MODLIB)/kernel
1158 @rm -f $(MODLIB)/source
1159 @mkdir -p $(MODLIB)/kernel
1160 @ln -s $(srctree) $(MODLIB)/source
1161 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1162 rm -f $(MODLIB)/build ; \
1163 ln -s $(objtree) $(MODLIB)/build ; \
1165 @cp -f $(objtree)/modules.order $(MODLIB)/
1166 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1168 # This depmod is only for convenience to give the initial
1169 # boot a modules.dep even before / is mounted read-write. However the
1170 # boot script depmod is the master version.
1171 PHONY += _modinst_post
1172 _modinst_post: _modinst_
1173 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1176 else # CONFIG_MODULES
1178 # Modules not configured
1179 # ---------------------------------------------------------------------------
1181 modules modules_install: FORCE
1183 @echo "The present kernel configuration has modules disabled."
1184 @echo "Type 'make config' and enable loadable module support."
1185 @echo "Then build a kernel with module support enabled."
1189 endif # CONFIG_MODULES
1192 # Cleaning is done on three levels.
1193 # make clean Delete most generated files
1194 # Leave enough to build external modules
1195 # make mrproper Delete the current configuration, and all generated files
1196 # make distclean Remove editor backup files, patch leftover files and the like
1198 # Directories & files removed with 'make clean'
1199 CLEAN_DIRS += $(MODVERDIR)
1200 CLEAN_FILES += vmlinux System.map \
1201 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1203 # Directories & files removed with 'make mrproper'
1204 MRPROPER_DIRS += include/config include2 usr/include include/generated
1205 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1206 include/linux/autoconf.h include/linux/version.h \
1207 include/linux/utsrelease.h \
1208 include/linux/bounds.h include/asm*/asm-offsets.h \
1209 Module.symvers Module.markers tags TAGS cscope*
1211 # clean - Delete most, but leave enough to build external modules
1213 clean: rm-dirs := $(CLEAN_DIRS)
1214 clean: rm-files := $(CLEAN_FILES)
1215 clean-dirs := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1217 PHONY += $(clean-dirs) clean archclean
1219 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1221 clean: archclean $(clean-dirs)
1224 @find . $(RCS_FIND_IGNORE) \
1225 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1226 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1227 -o -name '*.symtypes' -o -name 'modules.order' \
1228 -o -name 'Module.markers' -o -name '.tmp_*.o.*' \
1229 -o -name '*.gcno' \) -type f -print | xargs rm -f
1231 # mrproper - Delete all generated files, including .config
1233 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1234 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1235 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1237 PHONY += $(mrproper-dirs) mrproper archmrproper
1239 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1241 mrproper: clean archmrproper $(mrproper-dirs)
1250 @find $(srctree) $(RCS_FIND_IGNORE) \
1251 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1252 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1253 -o -name '.*.rej' -o -size 0 \
1254 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1255 -type f -print | xargs rm -f
1258 # Packaging of the kernel to various formats
1259 # ---------------------------------------------------------------------------
1260 # rpm target kept for backward compatibility
1261 package-dir := $(srctree)/scripts/package
1263 %pkg: include/config/kernel.release FORCE
1264 $(Q)$(MAKE) $(build)=$(package-dir) $@
1265 rpm: include/config/kernel.release FORCE
1266 $(Q)$(MAKE) $(build)=$(package-dir) $@
1269 # Brief documentation of the typical targets used
1270 # ---------------------------------------------------------------------------
1272 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1273 boards := $(notdir $(boards))
1274 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1275 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1278 @echo 'Cleaning targets:'
1279 @echo ' clean - Remove most generated files but keep the config and'
1280 @echo ' enough build support to build external modules'
1281 @echo ' mrproper - Remove all generated files + config + various backup files'
1282 @echo ' distclean - mrproper + remove editor backup and patch files'
1284 @echo 'Configuration targets:'
1285 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1287 @echo 'Other generic targets:'
1288 @echo ' all - Build all targets marked with [*]'
1289 @echo '* vmlinux - Build the bare kernel'
1290 @echo '* modules - Build all modules'
1291 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1292 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1293 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1294 @echo ' dir/ - Build all files in dir and below'
1295 @echo ' dir/file.[ois] - Build specified target only'
1296 @echo ' dir/file.ko - Build module including final link'
1297 @echo ' modules_prepare - Set up for building external modules'
1298 @echo ' tags/TAGS - Generate tags file for editors'
1299 @echo ' cscope - Generate cscope index'
1300 @echo ' kernelrelease - Output the release version string'
1301 @echo ' kernelversion - Output the version stored in Makefile'
1302 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1303 echo ' (default: $(INSTALL_HDR_PATH))'; \
1305 @echo 'Static analysers'
1306 @echo ' checkstack - Generate a list of stack hogs'
1307 @echo ' namespacecheck - Name space analysis on compiled kernel'
1308 @echo ' versioncheck - Sanity check on version.h usage'
1309 @echo ' includecheck - Check for duplicate included header files'
1310 @echo ' export_report - List the usages of all exported symbols'
1311 @echo ' headers_check - Sanity check on exported headers'
1312 @echo ' headerdep - Detect inclusion cycles in headers'; \
1314 @echo 'Kernel packaging:'
1315 @$(MAKE) $(build)=$(package-dir) help
1317 @echo 'Documentation targets:'
1318 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1320 @echo 'Architecture specific targets ($(SRCARCH)):'
1321 @$(if $(archhelp),$(archhelp),\
1322 echo ' No architecture specific help defined for $(SRCARCH)')
1325 $(foreach b, $(boards), \
1326 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1328 @$(if $(board-dirs), \
1329 $(foreach b, $(board-dirs), \
1330 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1331 printf " %-16s - Show all of the above\\n" help-boards; \
1334 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1335 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1336 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1337 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1338 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1340 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1341 @echo 'For further info see the ./README file'
1344 help-board-dirs := $(addprefix help-,$(board-dirs))
1346 help-boards: $(help-board-dirs)
1348 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1350 $(help-board-dirs): help-%:
1351 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1352 @$(if $(boards-per-dir), \
1353 $(foreach b, $(boards-per-dir), \
1354 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1358 # Documentation targets
1359 # ---------------------------------------------------------------------------
1360 %docs: scripts_basic FORCE
1361 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1363 else # KBUILD_EXTMOD
1366 # External module support.
1367 # When building external modules the kernel used as basis is considered
1368 # read-only, and no consistency checks are made and the make
1369 # system is not used on the basis kernel. If updates are required
1370 # in the basis kernel ordinary make commands (without M=...) must
1373 # The following are the only valid targets when building external
1375 # make M=dir clean Delete all automatically generated files
1376 # make M=dir modules Make all modules in specified dir
1377 # make M=dir Same as 'make M=dir modules'
1378 # make M=dir modules_install
1379 # Install the modules built in the module directory
1380 # Assumes install directory is already created
1382 # We are always building modules
1384 PHONY += crmodverdir
1388 PHONY += $(objtree)/Module.symvers
1389 $(objtree)/Module.symvers:
1390 @test -e $(objtree)/Module.symvers || ( \
1392 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1393 echo " is missing; modules will have no dependencies and modversions."; \
1396 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1397 PHONY += $(module-dirs) modules
1398 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1399 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1401 modules: $(module-dirs)
1402 @$(kecho) ' Building modules, stage 2.';
1403 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1405 PHONY += modules_install
1406 modules_install: _emodinst_ _emodinst_post
1408 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1411 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1412 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1414 PHONY += _emodinst_post
1415 _emodinst_post: _emodinst_
1418 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1420 PHONY += $(clean-dirs) clean
1422 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1424 clean: rm-dirs := $(MODVERDIR)
1425 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers \
1426 $(KBUILD_EXTMOD)/Module.markers \
1427 $(KBUILD_EXTMOD)/modules.order
1428 clean: $(clean-dirs)
1431 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1432 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1433 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1434 -o -name '*.gcno' \) -type f -print | xargs rm -f
1437 @echo ' Building external modules.'
1438 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1440 @echo ' modules - default target, build the module(s)'
1441 @echo ' modules_install - install the module'
1442 @echo ' clean - remove generated files in module directory only'
1446 PHONY += prepare scripts
1449 endif # KBUILD_EXTMOD
1451 # Generate tags for editors
1452 # ---------------------------------------------------------------------------
1453 quiet_cmd_tags = GEN $@
1454 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1456 tags TAGS cscope: FORCE
1459 # Scripts to check various things for consistency
1460 # ---------------------------------------------------------------------------
1463 find * $(RCS_FIND_IGNORE) \
1464 -name '*.[hcS]' -type f -print | sort \
1465 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1468 find * $(RCS_FIND_IGNORE) \
1469 -name '*.[hcS]' -type f -print | sort \
1470 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1473 $(PERL) $(srctree)/scripts/namespace.pl
1476 $(PERL) $(srctree)/scripts/export_report.pl
1478 endif #ifeq ($(config-targets),1)
1479 endif #ifeq ($(mixed-targets),1)
1481 PHONY += checkstack kernelrelease kernelversion
1483 # UML needs a little special treatment here. It wants to use the host
1484 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1485 # else wants $(ARCH), including people doing cross-builds, which means
1486 # that $(SUBARCH) doesn't work here.
1488 CHECKSTACK_ARCH := $(SUBARCH)
1490 CHECKSTACK_ARCH := $(ARCH)
1493 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1494 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1497 $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1498 $(error kernelrelease not valid - run 'make prepare' to update it))
1500 @echo $(KERNELVERSION)
1503 # ---------------------------------------------------------------------------
1504 # Single targets are compatible with:
1505 # - build with mixed source and output
1506 # - build with separate output dir 'make O=...'
1507 # - external modules
1509 # target-dir => where to store outputfile
1510 # build-dir => directory in kernel source tree to use
1512 ifeq ($(KBUILD_EXTMOD),)
1513 build-dir = $(patsubst %/,%,$(dir $@))
1514 target-dir = $(dir $@)
1516 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1517 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1518 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1521 %.s: %.c prepare scripts FORCE
1522 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1523 %.i: %.c prepare scripts FORCE
1524 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1525 %.o: %.c prepare scripts FORCE
1526 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1527 %.lst: %.c prepare scripts FORCE
1528 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1529 %.s: %.S prepare scripts FORCE
1530 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1531 %.o: %.S prepare scripts FORCE
1532 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1533 %.symtypes: %.c prepare scripts FORCE
1534 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1537 /: prepare scripts FORCE
1539 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1540 $(build)=$(build-dir)
1541 %/: prepare scripts FORCE
1543 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1544 $(build)=$(build-dir)
1545 %.ko: prepare scripts FORCE
1547 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1548 $(build)=$(build-dir) $(@:.ko=.o)
1549 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1551 # FIXME Should go into a make.lib or something
1552 # ===========================================================================
1554 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1555 cmd_rmdirs = rm -rf $(rm-dirs)
1557 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1558 cmd_rmfiles = rm -f $(rm-files)
1560 # Run depmod only if we have System.map and depmod is executable
1561 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1563 if [ -r System.map -a -x $(DEPMOD) ]; then \
1564 $(DEPMOD) -ae -F System.map \
1565 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) ) \
1569 # Create temporary dir for module support files
1570 # clean it up only when building all modules
1571 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1572 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1574 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1575 $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1576 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1578 quiet_cmd_as_o_S = AS $@
1579 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1581 # read all saved command lines
1583 targets := $(wildcard $(sort $(targets)))
1584 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1586 ifneq ($(cmd_files),)
1587 $(cmd_files): ; # Do not try to update included dependency files
1588 include $(cmd_files)
1591 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1593 # $(Q)$(MAKE) $(clean)=dir
1594 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1596 endif # skip-makefile
1601 # Declare the contents of the .PHONY variable as phony. We keep that
1602 # information in a variable so we can use it in if_changed and friends.