udf: Try harder when looking for VAT inode
[linux-2.6/mini2440.git] / Makefile
blob72b531554cb972471e5395e63b92e1f3f215f55e
1 VERSION = 2
2 PATCHLEVEL = 6
3 SUBLEVEL = 31
4 EXTRAVERSION = .9
5 NAME = Man-Eating Seals of Antiquity
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 # Do not:
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 # We are using a recursive build, so we need to do a little thinking
20 # to get the ordering right.
22 # Most importantly: sub-Makefiles should only ever modify files in
23 # their own directory. If in some directory we have a dependency on
24 # a file in another dir (which doesn't happen often, but it's often
25 # unavoidable when linking the built-in.o targets which finally
26 # turn into vmlinux), we will call a sub make in that other dir, and
27 # after that we are sure that everything which is in that other dir
28 # is now up to date.
30 # The only cases where we need to modify files which have global
31 # effects are thus separated out and done before the recursive
32 # descending is started. They are now explicitly listed as the
33 # prepare rule.
35 # To put more focus on warnings, be less verbose as default
36 # Use 'make V=1' to see the full commands
38 ifeq ("$(origin V)", "command line")
39 KBUILD_VERBOSE = $(V)
40 endif
41 ifndef KBUILD_VERBOSE
42 KBUILD_VERBOSE = 0
43 endif
45 # Call a source code checker (by default, "sparse") as part of the
46 # C compilation.
48 # Use 'make C=1' to enable checking of only re-compiled files.
49 # Use 'make C=2' to enable checking of *all* source files, regardless
50 # of whether they are re-compiled or not.
52 # See the file "Documentation/sparse.txt" for more details, including
53 # where to get the "sparse" utility.
55 ifeq ("$(origin C)", "command line")
56 KBUILD_CHECKSRC = $(C)
57 endif
58 ifndef KBUILD_CHECKSRC
59 KBUILD_CHECKSRC = 0
60 endif
62 # Use make M=dir to specify directory of external module to build
63 # Old syntax make ... SUBDIRS=$PWD is still supported
64 # Setting the environment variable KBUILD_EXTMOD take precedence
65 ifdef SUBDIRS
66 KBUILD_EXTMOD ?= $(SUBDIRS)
67 endif
69 ifeq ("$(origin M)", "command line")
70 KBUILD_EXTMOD := $(M)
71 endif
73 # kbuild supports saving output files in a separate directory.
74 # To locate output files in a separate directory two syntaxes are supported.
75 # In both cases the working directory must be the root of the kernel src.
76 # 1) O=
77 # Use "make O=dir/to/store/output/files/"
79 # 2) Set KBUILD_OUTPUT
80 # Set the environment variable KBUILD_OUTPUT to point to the directory
81 # where the output files shall be placed.
82 # export KBUILD_OUTPUT=dir/to/store/output/files/
83 # make
85 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
86 # variable.
89 # KBUILD_SRC is set on invocation of make in OBJ directory
90 # KBUILD_SRC is not intended to be used by the regular user (for now)
91 ifeq ($(KBUILD_SRC),)
93 # OK, Make called in directory where kernel src resides
94 # Do we want to locate output files in a separate directory?
95 ifeq ("$(origin O)", "command line")
96 KBUILD_OUTPUT := $(O)
97 endif
99 # That's our default target when none is given on the command line
100 PHONY := _all
101 _all:
103 # Cancel implicit rules on top Makefile
104 $(CURDIR)/Makefile Makefile: ;
106 ifneq ($(KBUILD_OUTPUT),)
107 # Invoke a second make in the output directory, passing relevant variables
108 # check that the output directory actually exists
109 saved-output := $(KBUILD_OUTPUT)
110 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
111 $(if $(KBUILD_OUTPUT),, \
112 $(error output directory "$(saved-output)" does not exist))
114 PHONY += $(MAKECMDGOALS) sub-make
116 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
117 $(Q)@:
119 sub-make: FORCE
120 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
121 KBUILD_SRC=$(CURDIR) \
122 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
123 $(filter-out _all sub-make,$(MAKECMDGOALS))
125 # Leave processing to above invocation of make
126 skip-makefile := 1
127 endif # ifneq ($(KBUILD_OUTPUT),)
128 endif # ifeq ($(KBUILD_SRC),)
130 # We process the rest of the Makefile if this is the final invocation of make
131 ifeq ($(skip-makefile),)
133 # If building an external module we do not care about the all: rule
134 # but instead _all depend on modules
135 PHONY += all
136 ifeq ($(KBUILD_EXTMOD),)
137 _all: all
138 else
139 _all: modules
140 endif
142 srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
143 objtree := $(CURDIR)
144 src := $(srctree)
145 obj := $(objtree)
147 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
149 export srctree objtree VPATH
152 # SUBARCH tells the usermode build what the underlying arch is. That is set
153 # first, and if a usermode build is happening, the "ARCH=um" on the command
154 # line overrides the setting of ARCH below. If a native build is happening,
155 # then ARCH is assigned, getting whatever value it gets normally, and
156 # SUBARCH is subsequently ignored.
158 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
159 -e s/arm.*/arm/ -e s/sa110/arm/ \
160 -e s/s390x/s390/ -e s/parisc64/parisc/ \
161 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
162 -e s/sh[234].*/sh/ )
164 # Cross compiling and selecting different set of gcc/bin-utils
165 # ---------------------------------------------------------------------------
167 # When performing cross compilation for other architectures ARCH shall be set
168 # to the target architecture. (See arch/* for the possibilities).
169 # ARCH can be set during invocation of make:
170 # make ARCH=ia64
171 # Another way is to have ARCH set in the environment.
172 # The default ARCH is the host where make is executed.
174 # CROSS_COMPILE specify the prefix used for all executables used
175 # during compilation. Only gcc and related bin-utils executables
176 # are prefixed with $(CROSS_COMPILE).
177 # CROSS_COMPILE can be set on the command line
178 # make CROSS_COMPILE=ia64-linux-
179 # Alternatively CROSS_COMPILE can be set in the environment.
180 # Default value for CROSS_COMPILE is not to prefix executables
181 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
182 export KBUILD_BUILDHOST := $(SUBARCH)
183 ARCH ?= $(SUBARCH)
184 CROSS_COMPILE ?=
186 # Architecture as present in compile.h
187 UTS_MACHINE := $(ARCH)
188 SRCARCH := $(ARCH)
190 # Additional ARCH settings for x86
191 ifeq ($(ARCH),i386)
192 SRCARCH := x86
193 endif
194 ifeq ($(ARCH),x86_64)
195 SRCARCH := x86
196 endif
198 # Additional ARCH settings for sparc
199 ifeq ($(ARCH),sparc64)
200 SRCARCH := sparc
201 endif
203 # Additional ARCH settings for sh
204 ifeq ($(ARCH),sh64)
205 SRCARCH := sh
206 endif
208 # Where to locate arch specific headers
209 hdr-arch := $(SRCARCH)
211 ifeq ($(ARCH),m68knommu)
212 hdr-arch := m68k
213 endif
215 KCONFIG_CONFIG ?= .config
217 # SHELL used by kbuild
218 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
219 else if [ -x /bin/bash ]; then echo /bin/bash; \
220 else echo sh; fi ; fi)
222 HOSTCC = gcc
223 HOSTCXX = g++
224 HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
225 HOSTCXXFLAGS = -O2
227 # Decide whether to build built-in, modular, or both.
228 # Normally, just do built-in.
230 KBUILD_MODULES :=
231 KBUILD_BUILTIN := 1
233 # If we have only "make modules", don't compile built-in objects.
234 # When we're building modules with modversions, we need to consider
235 # the built-in objects during the descend as well, in order to
236 # make sure the checksums are up to date before we record them.
238 ifeq ($(MAKECMDGOALS),modules)
239 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
240 endif
242 # If we have "make <whatever> modules", compile modules
243 # in addition to whatever we do anyway.
244 # Just "make" or "make all" shall build modules as well
246 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
247 KBUILD_MODULES := 1
248 endif
250 ifeq ($(MAKECMDGOALS),)
251 KBUILD_MODULES := 1
252 endif
254 export KBUILD_MODULES KBUILD_BUILTIN
255 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
257 # Beautify output
258 # ---------------------------------------------------------------------------
260 # Normally, we echo the whole command before executing it. By making
261 # that echo $($(quiet)$(cmd)), we now have the possibility to set
262 # $(quiet) to choose other forms of output instead, e.g.
264 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
265 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
267 # If $(quiet) is empty, the whole command will be printed.
268 # If it is set to "quiet_", only the short version will be printed.
269 # If it is set to "silent_", nothing will be printed at all, since
270 # the variable $(silent_cmd_cc_o_c) doesn't exist.
272 # A simple variant is to prefix commands with $(Q) - that's useful
273 # for commands that shall be hidden in non-verbose mode.
275 # $(Q)ln $@ :<
277 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
278 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
280 ifeq ($(KBUILD_VERBOSE),1)
281 quiet =
283 else
284 quiet=quiet_
285 Q = @
286 endif
288 # If the user is running make -s (silent mode), suppress echoing of
289 # commands
291 ifneq ($(findstring s,$(MAKEFLAGS)),)
292 quiet=silent_
293 endif
295 export quiet Q KBUILD_VERBOSE
298 # Look for make include files relative to root of kernel src
299 MAKEFLAGS += --include-dir=$(srctree)
301 # We need some generic definitions (do not try to remake the file).
302 $(srctree)/scripts/Kbuild.include: ;
303 include $(srctree)/scripts/Kbuild.include
305 # Make variables (CC, etc...)
307 AS = $(CROSS_COMPILE)as
308 LD = $(CROSS_COMPILE)ld
309 CC = $(CROSS_COMPILE)gcc
310 CPP = $(CC) -E
311 AR = $(CROSS_COMPILE)ar
312 NM = $(CROSS_COMPILE)nm
313 STRIP = $(CROSS_COMPILE)strip
314 OBJCOPY = $(CROSS_COMPILE)objcopy
315 OBJDUMP = $(CROSS_COMPILE)objdump
316 AWK = awk
317 GENKSYMS = scripts/genksyms/genksyms
318 DEPMOD = /sbin/depmod
319 KALLSYMS = scripts/kallsyms
320 PERL = perl
321 CHECK = sparse
323 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
324 -Wbitwise -Wno-return-void $(CF)
325 MODFLAGS = -DMODULE
326 CFLAGS_MODULE = $(MODFLAGS)
327 AFLAGS_MODULE = $(MODFLAGS)
328 LDFLAGS_MODULE =
329 CFLAGS_KERNEL =
330 AFLAGS_KERNEL =
331 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
334 # Use LINUXINCLUDE when you must reference the include/ directory.
335 # Needed to be compatible with the O= option
336 LINUXINCLUDE := -Iinclude \
337 $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
338 -I$(srctree)/arch/$(hdr-arch)/include \
339 -include include/linux/autoconf.h
341 KBUILD_CPPFLAGS := -D__KERNEL__
343 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
344 -fno-strict-aliasing -fno-common \
345 -Werror-implicit-function-declaration \
346 -Wno-format-security \
347 -fno-delete-null-pointer-checks
348 KBUILD_AFLAGS := -D__ASSEMBLY__
350 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
351 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
352 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
354 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
355 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
356 export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
357 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
359 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
360 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
361 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
363 # When compiling out-of-tree modules, put MODVERDIR in the module
364 # tree rather than in the kernel tree. The kernel tree might
365 # even be read-only.
366 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
368 # Files to ignore in find ... statements
370 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
371 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
373 # ===========================================================================
374 # Rules shared between *config targets and build targets
376 # Basic helpers built in scripts/
377 PHONY += scripts_basic
378 scripts_basic:
379 $(Q)$(MAKE) $(build)=scripts/basic
381 # To avoid any implicit rule to kick in, define an empty command.
382 scripts/basic/%: scripts_basic ;
384 PHONY += outputmakefile
385 # outputmakefile generates a Makefile in the output directory, if using a
386 # separate output directory. This allows convenient use of make in the
387 # output directory.
388 outputmakefile:
389 ifneq ($(KBUILD_SRC),)
390 $(Q)ln -fsn $(srctree) source
391 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
392 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
393 endif
395 # To make sure we do not include .config for any of the *config targets
396 # catch them early, and hand them over to scripts/kconfig/Makefile
397 # It is allowed to specify more targets when calling make, including
398 # mixing *config targets and build targets.
399 # For example 'make oldconfig all'.
400 # Detect when mixed targets is specified, and make a second invocation
401 # of make so .config is not included in this case either (for *config).
403 no-dot-config-targets := clean mrproper distclean \
404 cscope TAGS tags help %docs check% \
405 include/linux/version.h headers_% \
406 kernelrelease kernelversion
408 config-targets := 0
409 mixed-targets := 0
410 dot-config := 1
412 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
413 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
414 dot-config := 0
415 endif
416 endif
418 ifeq ($(KBUILD_EXTMOD),)
419 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
420 config-targets := 1
421 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
422 mixed-targets := 1
423 endif
424 endif
425 endif
427 ifeq ($(mixed-targets),1)
428 # ===========================================================================
429 # We're called with mixed targets (*config and build targets).
430 # Handle them one by one.
432 %:: FORCE
433 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
435 else
436 ifeq ($(config-targets),1)
437 # ===========================================================================
438 # *config targets only - make sure prerequisites are updated, and descend
439 # in scripts/kconfig to make the *config target
441 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
442 # KBUILD_DEFCONFIG may point out an alternative default configuration
443 # used for 'make defconfig'
444 include $(srctree)/arch/$(SRCARCH)/Makefile
445 export KBUILD_DEFCONFIG KBUILD_KCONFIG
447 config: scripts_basic outputmakefile FORCE
448 $(Q)mkdir -p include/linux include/config
449 $(Q)$(MAKE) $(build)=scripts/kconfig $@
451 %config: scripts_basic outputmakefile FORCE
452 $(Q)mkdir -p include/linux include/config
453 $(Q)$(MAKE) $(build)=scripts/kconfig $@
455 else
456 # ===========================================================================
457 # Build targets only - this includes vmlinux, arch specific targets, clean
458 # targets and others. In general all targets except *config targets.
460 ifeq ($(KBUILD_EXTMOD),)
461 # Additional helpers built in scripts/
462 # Carefully list dependencies so we do not try to build scripts twice
463 # in parallel
464 PHONY += scripts
465 scripts: scripts_basic include/config/auto.conf
466 $(Q)$(MAKE) $(build)=$(@)
468 # Objects we will link into vmlinux / subdirs we need to visit
469 init-y := init/
470 drivers-y := drivers/ sound/ firmware/
471 net-y := net/
472 libs-y := lib/
473 core-y := usr/
474 endif # KBUILD_EXTMOD
476 ifeq ($(dot-config),1)
477 # Read in config
478 -include include/config/auto.conf
480 ifeq ($(KBUILD_EXTMOD),)
481 # Read in dependencies to all Kconfig* files, make sure to run
482 # oldconfig if changes are detected.
483 -include include/config/auto.conf.cmd
485 # To avoid any implicit rule to kick in, define an empty command
486 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
488 # If .config is newer than include/config/auto.conf, someone tinkered
489 # with it and forgot to run make oldconfig.
490 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
491 # we execute the config step to be sure to catch updated Kconfig files
492 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
493 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
494 else
495 # external modules needs include/linux/autoconf.h and include/config/auto.conf
496 # but do not care if they are up-to-date. Use auto.conf to trigger the test
497 PHONY += include/config/auto.conf
499 include/config/auto.conf:
500 $(Q)test -e include/linux/autoconf.h -a -e $@ || ( \
501 echo; \
502 echo " ERROR: Kernel configuration is invalid."; \
503 echo " include/linux/autoconf.h or $@ are missing."; \
504 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
505 echo; \
506 /bin/false)
508 endif # KBUILD_EXTMOD
510 else
511 # Dummy target needed, because used as prerequisite
512 include/config/auto.conf: ;
513 endif # $(dot-config)
515 # The all: target is the default when no target is given on the
516 # command line.
517 # This allow a user to issue only 'make' to build a kernel including modules
518 # Defaults vmlinux but it is usually overridden in the arch makefile
519 all: vmlinux
521 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
522 KBUILD_CFLAGS += -Os
523 else
524 KBUILD_CFLAGS += -O2
525 endif
527 include $(srctree)/arch/$(SRCARCH)/Makefile
529 ifneq ($(CONFIG_FRAME_WARN),0)
530 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
531 endif
533 # Force gcc to behave correct even for buggy distributions
534 ifndef CONFIG_CC_STACKPROTECTOR
535 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
536 endif
538 ifdef CONFIG_FRAME_POINTER
539 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
540 else
541 KBUILD_CFLAGS += -fomit-frame-pointer
542 endif
544 ifdef CONFIG_DEBUG_INFO
545 KBUILD_CFLAGS += -g
546 KBUILD_AFLAGS += -gdwarf-2
547 endif
549 ifdef CONFIG_FUNCTION_TRACER
550 KBUILD_CFLAGS += -pg
551 endif
553 # We trigger additional mismatches with less inlining
554 ifdef CONFIG_DEBUG_SECTION_MISMATCH
555 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
556 endif
558 # arch Makefile may override CC so keep this after arch Makefile is included
559 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
560 CHECKFLAGS += $(NOSTDINC_FLAGS)
562 # warn about C99 declaration after statement
563 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
565 # disable pointer signed / unsigned warnings in gcc 4.0
566 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
568 # disable invalid "can't wrap" optimizations for signed / pointers
569 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
571 # revert to pre-gcc-4.4 behaviour of .eh_frame
572 KBUILD_CFLAGS += $(call cc-option,-fno-dwarf2-cfi-asm)
574 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
575 # But warn user when we do so
576 warn-assign = \
577 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
579 ifneq ($(KCPPFLAGS),)
580 $(call warn-assign,CPPFLAGS)
581 KBUILD_CPPFLAGS += $(KCPPFLAGS)
582 endif
583 ifneq ($(KAFLAGS),)
584 $(call warn-assign,AFLAGS)
585 KBUILD_AFLAGS += $(KAFLAGS)
586 endif
587 ifneq ($(KCFLAGS),)
588 $(call warn-assign,CFLAGS)
589 KBUILD_CFLAGS += $(KCFLAGS)
590 endif
592 # Use --build-id when available.
593 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
594 $(call ld-option, -Wl$(comma)--build-id,))
595 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
596 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
598 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
599 LDFLAGS_vmlinux += -X
600 endif
602 # Default kernel image to build when no specific target is given.
603 # KBUILD_IMAGE may be overruled on the command line or
604 # set in the environment
605 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
606 # this default value
607 export KBUILD_IMAGE ?= vmlinux
610 # INSTALL_PATH specifies where to place the updated kernel and system map
611 # images. Default is /boot, but you can set it to other values
612 export INSTALL_PATH ?= /boot
615 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
616 # relocations required by build roots. This is not defined in the
617 # makefile but the argument can be passed to make if needed.
620 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
621 export MODLIB
624 # INSTALL_MOD_STRIP, if defined, will cause modules to be
625 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
626 # the default option --strip-debug will be used. Otherwise,
627 # INSTALL_MOD_STRIP will used as the options to the strip command.
629 ifdef INSTALL_MOD_STRIP
630 ifeq ($(INSTALL_MOD_STRIP),1)
631 mod_strip_cmd = $(STRIP) --strip-debug
632 else
633 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
634 endif # INSTALL_MOD_STRIP=1
635 else
636 mod_strip_cmd = true
637 endif # INSTALL_MOD_STRIP
638 export mod_strip_cmd
641 ifeq ($(KBUILD_EXTMOD),)
642 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
644 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
645 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
646 $(net-y) $(net-m) $(libs-y) $(libs-m)))
648 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
649 $(init-n) $(init-) \
650 $(core-n) $(core-) $(drivers-n) $(drivers-) \
651 $(net-n) $(net-) $(libs-n) $(libs-))))
653 init-y := $(patsubst %/, %/built-in.o, $(init-y))
654 core-y := $(patsubst %/, %/built-in.o, $(core-y))
655 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
656 net-y := $(patsubst %/, %/built-in.o, $(net-y))
657 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
658 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
659 libs-y := $(libs-y1) $(libs-y2)
661 # Build vmlinux
662 # ---------------------------------------------------------------------------
663 # vmlinux is built from the objects selected by $(vmlinux-init) and
664 # $(vmlinux-main). Most are built-in.o files from top-level directories
665 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
666 # Ordering when linking is important, and $(vmlinux-init) must be first.
668 # vmlinux
671 # +-< $(vmlinux-init)
672 # | +--< init/version.o + more
674 # +--< $(vmlinux-main)
675 # | +--< driver/built-in.o mm/built-in.o + more
677 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
679 # vmlinux version (uname -v) cannot be updated during normal
680 # descending-into-subdirs phase since we do not yet know if we need to
681 # update vmlinux.
682 # Therefore this step is delayed until just before final link of vmlinux -
683 # except in the kallsyms case where it is done just before adding the
684 # symbols to the kernel.
686 # System.map is generated to document addresses of all kernel symbols
688 vmlinux-init := $(head-y) $(init-y)
689 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
690 vmlinux-all := $(vmlinux-init) $(vmlinux-main)
691 vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
692 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
694 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
695 # May be overridden by arch/$(ARCH)/Makefile
696 quiet_cmd_vmlinux__ ?= LD $@
697 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
698 -T $(vmlinux-lds) $(vmlinux-init) \
699 --start-group $(vmlinux-main) --end-group \
700 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
702 # Generate new vmlinux version
703 quiet_cmd_vmlinux_version = GEN .version
704 cmd_vmlinux_version = set -e; \
705 if [ ! -r .version ]; then \
706 rm -f .version; \
707 echo 1 >.version; \
708 else \
709 mv .version .old_version; \
710 expr 0$$(cat .old_version) + 1 >.version; \
711 fi; \
712 $(MAKE) $(build)=init
714 # Generate System.map
715 quiet_cmd_sysmap = SYSMAP
716 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
718 # Link of vmlinux
719 # If CONFIG_KALLSYMS is set .version is already updated
720 # Generate System.map and verify that the content is consistent
721 # Use + in front of the vmlinux_version rule to silent warning with make -j2
722 # First command is ':' to allow us to use + in front of the rule
723 define rule_vmlinux__
725 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
727 $(call cmd,vmlinux__)
728 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
730 $(Q)$(if $($(quiet)cmd_sysmap), \
731 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
732 $(cmd_sysmap) $@ System.map; \
733 if [ $$? -ne 0 ]; then \
734 rm -f $@; \
735 /bin/false; \
737 $(verify_kallsyms)
738 endef
741 ifdef CONFIG_KALLSYMS
742 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
743 # It's a three stage process:
744 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
745 # empty
746 # Running kallsyms on that gives us .tmp_kallsyms1.o with
747 # the right size - vmlinux version (uname -v) is updated during this step
748 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
749 # but due to the added section, some addresses have shifted.
750 # From here, we generate a correct .tmp_kallsyms2.o
751 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
752 # o Verify that the System.map from vmlinux matches the map from
753 # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
754 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
755 # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
756 # temporary bypass to allow the kernel to be built while the
757 # maintainers work out what went wrong with kallsyms.
759 ifdef CONFIG_KALLSYMS_EXTRA_PASS
760 last_kallsyms := 3
761 else
762 last_kallsyms := 2
763 endif
765 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
767 define verify_kallsyms
768 $(Q)$(if $($(quiet)cmd_sysmap), \
769 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
770 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
771 $(Q)cmp -s System.map .tmp_System.map || \
772 (echo Inconsistent kallsyms data; \
773 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
774 rm .tmp_kallsyms* ; /bin/false )
775 endef
777 # Update vmlinux version before link
778 # Use + in front of this rule to silent warning about make -j1
779 # First command is ':' to allow us to use + in front of this rule
780 cmd_ksym_ld = $(cmd_vmlinux__)
781 define rule_ksym_ld
783 +$(call cmd,vmlinux_version)
784 $(call cmd,vmlinux__)
785 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
786 endef
788 # Generate .S file with all kernel symbols
789 quiet_cmd_kallsyms = KSYM $@
790 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
791 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
793 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
794 $(call if_changed_dep,as_o_S)
796 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
797 $(call cmd,kallsyms)
799 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
800 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
801 $(call if_changed_rule,ksym_ld)
803 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
804 $(call if_changed,vmlinux__)
806 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
807 $(call if_changed,vmlinux__)
809 # Needs to visit scripts/ before $(KALLSYMS) can be used.
810 $(KALLSYMS): scripts ;
812 # Generate some data for debugging strange kallsyms problems
813 debug_kallsyms: .tmp_map$(last_kallsyms)
815 .tmp_map%: .tmp_vmlinux% FORCE
816 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
818 .tmp_map3: .tmp_map2
820 .tmp_map2: .tmp_map1
822 endif # ifdef CONFIG_KALLSYMS
824 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
825 # relevant sections renamed as per the linker script.
826 quiet_cmd_vmlinux-modpost = LD $@
827 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
828 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
829 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
830 define rule_vmlinux-modpost
832 +$(call cmd,vmlinux-modpost)
833 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
834 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
835 endef
837 # vmlinux image - including updated kernel symbols
838 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
839 ifdef CONFIG_HEADERS_CHECK
840 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
841 endif
842 ifdef CONFIG_SAMPLES
843 $(Q)$(MAKE) $(build)=samples
844 endif
845 ifdef CONFIG_BUILD_DOCSRC
846 $(Q)$(MAKE) $(build)=Documentation
847 endif
848 $(call vmlinux-modpost)
849 $(call if_changed_rule,vmlinux__)
850 $(Q)rm -f .old_version
852 # build vmlinux.o first to catch section mismatch errors early
853 ifdef CONFIG_KALLSYMS
854 .tmp_vmlinux1: vmlinux.o
855 endif
857 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
858 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
859 $(call if_changed_rule,vmlinux-modpost)
861 # The actual objects are generated when descending,
862 # make sure no implicit rule kicks in
863 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
865 # Handle descending into subdirectories listed in $(vmlinux-dirs)
866 # Preset locale variables to speed up the build process. Limit locale
867 # tweaks to this spot to avoid wrong language settings when running
868 # make menuconfig etc.
869 # Error messages still appears in the original language
871 PHONY += $(vmlinux-dirs)
872 $(vmlinux-dirs): prepare scripts
873 $(Q)$(MAKE) $(build)=$@
875 # Build the kernel release string
877 # The KERNELRELEASE value built here is stored in the file
878 # include/config/kernel.release, and is used when executing several
879 # make targets, such as "make install" or "make modules_install."
881 # The eventual kernel release string consists of the following fields,
882 # shown in a hierarchical format to show how smaller parts are concatenated
883 # to form the larger and final value, with values coming from places like
884 # the Makefile, kernel config options, make command line options and/or
885 # SCM tag information.
887 # $(KERNELVERSION)
888 # $(VERSION) eg, 2
889 # $(PATCHLEVEL) eg, 6
890 # $(SUBLEVEL) eg, 18
891 # $(EXTRAVERSION) eg, -rc6
892 # $(localver-full)
893 # $(localver)
894 # localversion* (files without backups, containing '~')
895 # $(CONFIG_LOCALVERSION) (from kernel config setting)
896 # $(localver-auto) (only if CONFIG_LOCALVERSION_AUTO is set)
897 # ./scripts/setlocalversion (SCM tag, if one exists)
898 # $(LOCALVERSION) (from make command line if provided)
900 # Note how the final $(localver-auto) string is included *only* if the
901 # kernel config option CONFIG_LOCALVERSION_AUTO is selected. Also, at the
902 # moment, only git is supported but other SCMs can edit the script
903 # scripts/setlocalversion and add the appropriate checks as needed.
905 pattern = ".*/localversion[^~]*"
906 string = $(shell cat /dev/null \
907 `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
909 localver = $(subst $(space),, $(string) \
910 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
912 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
913 # and if the SCM is know a tag from the SCM is appended.
914 # The appended tag is determined by the SCM used.
916 # .scmversion is used when generating rpm packages so we do not loose
917 # the version information from the SCM when we do the build of the kernel
918 # from the copied source
919 ifdef CONFIG_LOCALVERSION_AUTO
921 ifeq ($(wildcard .scmversion),)
922 _localver-auto = $(shell $(CONFIG_SHELL) \
923 $(srctree)/scripts/setlocalversion $(srctree))
924 else
925 _localver-auto = $(shell cat .scmversion 2> /dev/null)
926 endif
928 localver-auto = $(LOCALVERSION)$(_localver-auto)
929 endif
931 localver-full = $(localver)$(localver-auto)
933 # Store (new) KERNELRELASE string in include/config/kernel.release
934 kernelrelease = $(KERNELVERSION)$(localver-full)
935 include/config/kernel.release: include/config/auto.conf FORCE
936 $(Q)rm -f $@
937 $(Q)echo $(kernelrelease) > $@
940 # Things we need to do before we recursively start building the kernel
941 # or the modules are listed in "prepare".
942 # A multi level approach is used. prepareN is processed before prepareN-1.
943 # archprepare is used in arch Makefiles and when processed asm symlink,
944 # version.h and scripts_basic is processed / created.
946 # Listed in dependency order
947 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
949 # prepare3 is used to check if we are building in a separate output directory,
950 # and if so do:
951 # 1) Check that make has not been executed in the kernel src $(srctree)
952 # 2) Create the include2 directory, used for the second asm symlink
953 prepare3: include/config/kernel.release
954 ifneq ($(KBUILD_SRC),)
955 @$(kecho) ' Using $(srctree) as source for kernel'
956 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
957 echo " $(srctree) is not clean, please run 'make mrproper'";\
958 echo " in the '$(srctree)' directory.";\
959 /bin/false; \
961 $(Q)if [ ! -d include2 ]; then \
962 mkdir -p include2; \
963 ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm; \
965 endif
967 # prepare2 creates a makefile if using a separate output directory
968 prepare2: prepare3 outputmakefile
970 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
971 include/asm include/config/auto.conf
972 $(cmd_crmodverdir)
974 archprepare: prepare1 scripts_basic
976 prepare0: archprepare FORCE
977 $(Q)$(MAKE) $(build)=.
978 $(Q)$(MAKE) $(build)=. missing-syscalls
980 # All the preparing..
981 prepare: prepare0
983 # The asm symlink changes when $(ARCH) changes.
984 # Detect this and ask user to run make mrproper
985 # If asm is a stale symlink (point to dir that does not exist) remove it
986 define check-symlink
987 set -e; \
988 if [ -L include/asm ]; then \
989 asmlink=`readlink include/asm | cut -d '-' -f 2`; \
990 if [ "$$asmlink" != "$(SRCARCH)" ]; then \
991 echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
992 echo " set ARCH or save .config and run 'make mrproper' to fix it"; \
993 exit 1; \
994 fi; \
995 test -e $$asmlink || rm include/asm; \
996 elif [ -d include/asm ]; then \
997 echo "ERROR: $@ is a directory but a symlink was expected";\
998 exit 1; \
1000 endef
1002 # We create the target directory of the symlink if it does
1003 # not exist so the test in check-symlink works and we have a
1004 # directory for generated filesas used by some architectures.
1005 define create-symlink
1006 if [ ! -L include/asm ]; then \
1007 $(kecho) ' SYMLINK $@ -> include/asm-$(SRCARCH)'; \
1008 if [ ! -d include/asm-$(SRCARCH) ]; then \
1009 mkdir -p include/asm-$(SRCARCH); \
1010 fi; \
1011 ln -fsn asm-$(SRCARCH) $@; \
1013 endef
1015 include/asm: FORCE
1016 $(Q)$(check-symlink)
1017 $(Q)$(create-symlink)
1019 # Generate some files
1020 # ---------------------------------------------------------------------------
1022 # KERNELRELEASE can change from a few different places, meaning version.h
1023 # needs to be updated, so this check is forced on all builds
1025 uts_len := 64
1026 define filechk_utsrelease.h
1027 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1028 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1029 exit 1; \
1030 fi; \
1031 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1032 endef
1034 define filechk_version.h
1035 (echo \#define LINUX_VERSION_CODE $(shell \
1036 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1037 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1038 endef
1040 include/linux/version.h: $(srctree)/Makefile FORCE
1041 $(call filechk,version.h)
1043 include/linux/utsrelease.h: include/config/kernel.release FORCE
1044 $(call filechk,utsrelease.h)
1046 PHONY += headerdep
1047 headerdep:
1048 $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
1050 # ---------------------------------------------------------------------------
1052 PHONY += depend dep
1053 depend dep:
1054 @echo '*** Warning: make $@ is unnecessary now.'
1056 # ---------------------------------------------------------------------------
1057 # Firmware install
1058 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1059 export INSTALL_FW_PATH
1061 PHONY += firmware_install
1062 firmware_install: FORCE
1063 @mkdir -p $(objtree)/firmware
1064 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1066 # ---------------------------------------------------------------------------
1067 # Kernel headers
1069 #Default location for installed headers
1070 export INSTALL_HDR_PATH = $(objtree)/usr
1072 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1073 # Find out where the Kbuild file is located to support
1074 # arch/$(ARCH)/include/asm
1075 hdr-dir = $(strip \
1076 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild), \
1077 arch/$(hdr-arch)/include/asm, include/asm-$(hdr-arch)))
1079 # If we do an all arch process set dst to asm-$(hdr-arch)
1080 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1082 PHONY += __headers
1083 __headers: include/linux/version.h scripts_basic FORCE
1084 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1086 PHONY += headers_install_all
1087 headers_install_all:
1088 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1090 PHONY += headers_install
1091 headers_install: __headers
1092 $(if $(wildcard $(srctree)/$(hdr-dir)/Kbuild),, \
1093 $(error Headers not exportable for the $(SRCARCH) architecture))
1094 $(Q)$(MAKE) $(hdr-inst)=include
1095 $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst)
1097 PHONY += headers_check_all
1098 headers_check_all: headers_install_all
1099 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1101 PHONY += headers_check
1102 headers_check: headers_install
1103 $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1104 $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst) HDRCHECK=1
1106 # ---------------------------------------------------------------------------
1107 # Modules
1109 ifdef CONFIG_MODULES
1111 # By default, build modules as well
1113 all: modules
1115 # Build modules
1117 # A module can be listed more than once in obj-m resulting in
1118 # duplicate lines in modules.order files. Those are removed
1119 # using awk while concatenating to the final file.
1121 PHONY += modules
1122 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1123 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1124 @$(kecho) ' Building modules, stage 2.';
1125 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1126 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1129 # Target to prepare building external modules
1130 PHONY += modules_prepare
1131 modules_prepare: prepare scripts
1133 # Target to install modules
1134 PHONY += modules_install
1135 modules_install: _modinst_ _modinst_post
1137 PHONY += _modinst_
1138 _modinst_:
1139 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1140 echo "Warning: you may need to install module-init-tools"; \
1141 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1142 sleep 1; \
1144 @rm -rf $(MODLIB)/kernel
1145 @rm -f $(MODLIB)/source
1146 @mkdir -p $(MODLIB)/kernel
1147 @ln -s $(srctree) $(MODLIB)/source
1148 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1149 rm -f $(MODLIB)/build ; \
1150 ln -s $(objtree) $(MODLIB)/build ; \
1152 @cp -f $(objtree)/modules.order $(MODLIB)/
1153 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1155 # This depmod is only for convenience to give the initial
1156 # boot a modules.dep even before / is mounted read-write. However the
1157 # boot script depmod is the master version.
1158 PHONY += _modinst_post
1159 _modinst_post: _modinst_
1160 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1161 $(call cmd,depmod)
1163 else # CONFIG_MODULES
1165 # Modules not configured
1166 # ---------------------------------------------------------------------------
1168 modules modules_install: FORCE
1169 @echo
1170 @echo "The present kernel configuration has modules disabled."
1171 @echo "Type 'make config' and enable loadable module support."
1172 @echo "Then build a kernel with module support enabled."
1173 @echo
1174 @exit 1
1176 endif # CONFIG_MODULES
1179 # Cleaning is done on three levels.
1180 # make clean Delete most generated files
1181 # Leave enough to build external modules
1182 # make mrproper Delete the current configuration, and all generated files
1183 # make distclean Remove editor backup files, patch leftover files and the like
1185 # Directories & files removed with 'make clean'
1186 CLEAN_DIRS += $(MODVERDIR)
1187 CLEAN_FILES += vmlinux System.map \
1188 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1190 # Directories & files removed with 'make mrproper'
1191 MRPROPER_DIRS += include/config include2 usr/include include/generated
1192 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1193 include/linux/autoconf.h include/linux/version.h \
1194 include/linux/utsrelease.h \
1195 include/linux/bounds.h include/asm*/asm-offsets.h \
1196 Module.symvers Module.markers tags TAGS cscope*
1198 # clean - Delete most, but leave enough to build external modules
1200 clean: rm-dirs := $(CLEAN_DIRS)
1201 clean: rm-files := $(CLEAN_FILES)
1202 clean-dirs := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1204 PHONY += $(clean-dirs) clean archclean
1205 $(clean-dirs):
1206 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1208 clean: archclean $(clean-dirs)
1209 $(call cmd,rmdirs)
1210 $(call cmd,rmfiles)
1211 @find . $(RCS_FIND_IGNORE) \
1212 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1213 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1214 -o -name '*.symtypes' -o -name 'modules.order' \
1215 -o -name 'Module.markers' -o -name '.tmp_*.o.*' \
1216 -o -name '*.gcno' \) -type f -print | xargs rm -f
1218 # mrproper - Delete all generated files, including .config
1220 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1221 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1222 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1224 PHONY += $(mrproper-dirs) mrproper archmrproper
1225 $(mrproper-dirs):
1226 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1228 mrproper: clean archmrproper $(mrproper-dirs)
1229 $(call cmd,rmdirs)
1230 $(call cmd,rmfiles)
1232 # distclean
1234 PHONY += distclean
1236 distclean: mrproper
1237 @find $(srctree) $(RCS_FIND_IGNORE) \
1238 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1239 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1240 -o -name '.*.rej' -o -size 0 \
1241 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1242 -type f -print | xargs rm -f
1245 # Packaging of the kernel to various formats
1246 # ---------------------------------------------------------------------------
1247 # rpm target kept for backward compatibility
1248 package-dir := $(srctree)/scripts/package
1250 %pkg: include/config/kernel.release FORCE
1251 $(Q)$(MAKE) $(build)=$(package-dir) $@
1252 rpm: include/config/kernel.release FORCE
1253 $(Q)$(MAKE) $(build)=$(package-dir) $@
1256 # Brief documentation of the typical targets used
1257 # ---------------------------------------------------------------------------
1259 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1260 boards := $(notdir $(boards))
1261 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1262 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1264 help:
1265 @echo 'Cleaning targets:'
1266 @echo ' clean - Remove most generated files but keep the config and'
1267 @echo ' enough build support to build external modules'
1268 @echo ' mrproper - Remove all generated files + config + various backup files'
1269 @echo ' distclean - mrproper + remove editor backup and patch files'
1270 @echo ''
1271 @echo 'Configuration targets:'
1272 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1273 @echo ''
1274 @echo 'Other generic targets:'
1275 @echo ' all - Build all targets marked with [*]'
1276 @echo '* vmlinux - Build the bare kernel'
1277 @echo '* modules - Build all modules'
1278 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1279 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1280 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1281 @echo ' dir/ - Build all files in dir and below'
1282 @echo ' dir/file.[ois] - Build specified target only'
1283 @echo ' dir/file.ko - Build module including final link'
1284 @echo ' modules_prepare - Set up for building external modules'
1285 @echo ' tags/TAGS - Generate tags file for editors'
1286 @echo ' cscope - Generate cscope index'
1287 @echo ' kernelrelease - Output the release version string'
1288 @echo ' kernelversion - Output the version stored in Makefile'
1289 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1290 echo ' (default: $(INSTALL_HDR_PATH))'; \
1291 echo ''
1292 @echo 'Static analysers'
1293 @echo ' checkstack - Generate a list of stack hogs'
1294 @echo ' namespacecheck - Name space analysis on compiled kernel'
1295 @echo ' versioncheck - Sanity check on version.h usage'
1296 @echo ' includecheck - Check for duplicate included header files'
1297 @echo ' export_report - List the usages of all exported symbols'
1298 @echo ' headers_check - Sanity check on exported headers'
1299 @echo ' headerdep - Detect inclusion cycles in headers'; \
1300 echo ''
1301 @echo 'Kernel packaging:'
1302 @$(MAKE) $(build)=$(package-dir) help
1303 @echo ''
1304 @echo 'Documentation targets:'
1305 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1306 @echo ''
1307 @echo 'Architecture specific targets ($(SRCARCH)):'
1308 @$(if $(archhelp),$(archhelp),\
1309 echo ' No architecture specific help defined for $(SRCARCH)')
1310 @echo ''
1311 @$(if $(boards), \
1312 $(foreach b, $(boards), \
1313 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1314 echo '')
1315 @$(if $(board-dirs), \
1316 $(foreach b, $(board-dirs), \
1317 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1318 printf " %-16s - Show all of the above\\n" help-boards; \
1319 echo '')
1321 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1322 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1323 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1324 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1325 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1326 @echo ''
1327 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1328 @echo 'For further info see the ./README file'
1331 help-board-dirs := $(addprefix help-,$(board-dirs))
1333 help-boards: $(help-board-dirs)
1335 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1337 $(help-board-dirs): help-%:
1338 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1339 @$(if $(boards-per-dir), \
1340 $(foreach b, $(boards-per-dir), \
1341 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1342 echo '')
1345 # Documentation targets
1346 # ---------------------------------------------------------------------------
1347 %docs: scripts_basic FORCE
1348 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1350 else # KBUILD_EXTMOD
1353 # External module support.
1354 # When building external modules the kernel used as basis is considered
1355 # read-only, and no consistency checks are made and the make
1356 # system is not used on the basis kernel. If updates are required
1357 # in the basis kernel ordinary make commands (without M=...) must
1358 # be used.
1360 # The following are the only valid targets when building external
1361 # modules.
1362 # make M=dir clean Delete all automatically generated files
1363 # make M=dir modules Make all modules in specified dir
1364 # make M=dir Same as 'make M=dir modules'
1365 # make M=dir modules_install
1366 # Install the modules built in the module directory
1367 # Assumes install directory is already created
1369 # We are always building modules
1370 KBUILD_MODULES := 1
1371 PHONY += crmodverdir
1372 crmodverdir:
1373 $(cmd_crmodverdir)
1375 PHONY += $(objtree)/Module.symvers
1376 $(objtree)/Module.symvers:
1377 @test -e $(objtree)/Module.symvers || ( \
1378 echo; \
1379 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1380 echo " is missing; modules will have no dependencies and modversions."; \
1381 echo )
1383 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1384 PHONY += $(module-dirs) modules
1385 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1386 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1388 modules: $(module-dirs)
1389 @$(kecho) ' Building modules, stage 2.';
1390 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1392 PHONY += modules_install
1393 modules_install: _emodinst_ _emodinst_post
1395 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1396 PHONY += _emodinst_
1397 _emodinst_:
1398 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1399 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1401 PHONY += _emodinst_post
1402 _emodinst_post: _emodinst_
1403 $(call cmd,depmod)
1405 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1407 PHONY += $(clean-dirs) clean
1408 $(clean-dirs):
1409 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1411 clean: rm-dirs := $(MODVERDIR)
1412 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers \
1413 $(KBUILD_EXTMOD)/Module.markers \
1414 $(KBUILD_EXTMOD)/modules.order
1415 clean: $(clean-dirs)
1416 $(call cmd,rmdirs)
1417 $(call cmd,rmfiles)
1418 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1419 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1420 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1421 -o -name '*.gcno' \) -type f -print | xargs rm -f
1423 help:
1424 @echo ' Building external modules.'
1425 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1426 @echo ''
1427 @echo ' modules - default target, build the module(s)'
1428 @echo ' modules_install - install the module'
1429 @echo ' clean - remove generated files in module directory only'
1430 @echo ''
1432 # Dummies...
1433 PHONY += prepare scripts
1434 prepare: ;
1435 scripts: ;
1436 endif # KBUILD_EXTMOD
1438 # Generate tags for editors
1439 # ---------------------------------------------------------------------------
1440 quiet_cmd_tags = GEN $@
1441 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1443 tags TAGS cscope: FORCE
1444 $(call cmd,tags)
1446 # Scripts to check various things for consistency
1447 # ---------------------------------------------------------------------------
1449 includecheck:
1450 find * $(RCS_FIND_IGNORE) \
1451 -name '*.[hcS]' -type f -print | sort \
1452 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1454 versioncheck:
1455 find * $(RCS_FIND_IGNORE) \
1456 -name '*.[hcS]' -type f -print | sort \
1457 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1459 namespacecheck:
1460 $(PERL) $(srctree)/scripts/namespace.pl
1462 export_report:
1463 $(PERL) $(srctree)/scripts/export_report.pl
1465 endif #ifeq ($(config-targets),1)
1466 endif #ifeq ($(mixed-targets),1)
1468 PHONY += checkstack kernelrelease kernelversion
1470 # UML needs a little special treatment here. It wants to use the host
1471 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1472 # else wants $(ARCH), including people doing cross-builds, which means
1473 # that $(SUBARCH) doesn't work here.
1474 ifeq ($(ARCH), um)
1475 CHECKSTACK_ARCH := $(SUBARCH)
1476 else
1477 CHECKSTACK_ARCH := $(ARCH)
1478 endif
1479 checkstack:
1480 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1481 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1483 kernelrelease:
1484 $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1485 $(error kernelrelease not valid - run 'make prepare' to update it))
1486 kernelversion:
1487 @echo $(KERNELVERSION)
1489 # Single targets
1490 # ---------------------------------------------------------------------------
1491 # Single targets are compatible with:
1492 # - build with mixed source and output
1493 # - build with separate output dir 'make O=...'
1494 # - external modules
1496 # target-dir => where to store outputfile
1497 # build-dir => directory in kernel source tree to use
1499 ifeq ($(KBUILD_EXTMOD),)
1500 build-dir = $(patsubst %/,%,$(dir $@))
1501 target-dir = $(dir $@)
1502 else
1503 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1504 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1505 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1506 endif
1508 %.s: %.c prepare scripts FORCE
1509 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1510 %.i: %.c prepare scripts FORCE
1511 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1512 %.o: %.c prepare scripts FORCE
1513 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1514 %.lst: %.c prepare scripts FORCE
1515 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1516 %.s: %.S prepare scripts FORCE
1517 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1518 %.o: %.S prepare scripts FORCE
1519 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1520 %.symtypes: %.c prepare scripts FORCE
1521 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1523 # Modules
1524 /: prepare scripts FORCE
1525 $(cmd_crmodverdir)
1526 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1527 $(build)=$(build-dir)
1528 %/: prepare scripts FORCE
1529 $(cmd_crmodverdir)
1530 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1531 $(build)=$(build-dir)
1532 %.ko: prepare scripts FORCE
1533 $(cmd_crmodverdir)
1534 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1535 $(build)=$(build-dir) $(@:.ko=.o)
1536 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1538 # FIXME Should go into a make.lib or something
1539 # ===========================================================================
1541 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1542 cmd_rmdirs = rm -rf $(rm-dirs)
1544 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1545 cmd_rmfiles = rm -f $(rm-files)
1547 # Run depmod only if we have System.map and depmod is executable
1548 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1549 cmd_depmod = \
1550 if [ -r System.map -a -x $(DEPMOD) ]; then \
1551 $(DEPMOD) -ae -F System.map \
1552 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) ) \
1553 $(KERNELRELEASE); \
1556 # Create temporary dir for module support files
1557 # clean it up only when building all modules
1558 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1559 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1561 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1562 $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1563 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1565 quiet_cmd_as_o_S = AS $@
1566 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1568 # read all saved command lines
1570 targets := $(wildcard $(sort $(targets)))
1571 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1573 ifneq ($(cmd_files),)
1574 $(cmd_files): ; # Do not try to update included dependency files
1575 include $(cmd_files)
1576 endif
1578 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1579 # Usage:
1580 # $(Q)$(MAKE) $(clean)=dir
1581 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1583 endif # skip-makefile
1585 PHONY += FORCE
1586 FORCE:
1588 # Declare the contents of the .PHONY variable as phony. We keep that
1589 # information in a variable so we can use it in if_changed and friends.
1590 .PHONY: $(PHONY)