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Linus Torvalds1da177e2005-04-16 15:20:36 -07001VERSION = 2
2PATCHLEVEL = 6
Linus Torvalds6246b612006-04-02 20:22:10 -07003SUBLEVEL = 17
Linus Torvalds1def6302006-06-05 17:57:02 -07004EXTRAVERSION =-rc6
5NAME=Crazed Snow-Weasel
Linus Torvalds1da177e2005-04-16 15:20:36 -07006
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.
12
13# Do not print "Entering directory ..."
14MAKEFLAGS += --no-print-directory
15
16# We are using a recursive build, so we need to do a little thinking
17# to get the ordering right.
18#
19# Most importantly: sub-Makefiles should only ever modify files in
20# their own directory. If in some directory we have a dependency on
21# a file in another dir (which doesn't happen often, but it's often
22# unavoidable when linking the built-in.o targets which finally
23# turn into vmlinux), we will call a sub make in that other dir, and
24# after that we are sure that everything which is in that other dir
25# is now up to date.
26#
27# The only cases where we need to modify files which have global
28# effects are thus separated out and done before the recursive
29# descending is started. They are now explicitly listed as the
30# prepare rule.
31
32# To put more focus on warnings, be less verbose as default
33# Use 'make V=1' to see the full commands
34
35ifdef V
36 ifeq ("$(origin V)", "command line")
37 KBUILD_VERBOSE = $(V)
38 endif
39endif
40ifndef KBUILD_VERBOSE
41 KBUILD_VERBOSE = 0
42endif
43
44# Call sparse as part of compilation of C files
45# Use 'make C=1' to enable sparse checking
46
47ifdef C
48 ifeq ("$(origin C)", "command line")
49 KBUILD_CHECKSRC = $(C)
50 endif
51endif
52ifndef KBUILD_CHECKSRC
53 KBUILD_CHECKSRC = 0
54endif
55
56# Use make M=dir to specify directory of external module to build
57# Old syntax make ... SUBDIRS=$PWD is still supported
58# Setting the environment variable KBUILD_EXTMOD take precedence
59ifdef SUBDIRS
60 KBUILD_EXTMOD ?= $(SUBDIRS)
61endif
62ifdef M
63 ifeq ("$(origin M)", "command line")
64 KBUILD_EXTMOD := $(M)
65 endif
66endif
67
68
69# kbuild supports saving output files in a separate directory.
70# To locate output files in a separate directory two syntaxes are supported.
71# In both cases the working directory must be the root of the kernel src.
72# 1) O=
73# Use "make O=dir/to/store/output/files/"
74#
75# 2) Set KBUILD_OUTPUT
76# Set the environment variable KBUILD_OUTPUT to point to the directory
77# where the output files shall be placed.
78# export KBUILD_OUTPUT=dir/to/store/output/files/
79# make
80#
81# The O= assignment takes precedence over the KBUILD_OUTPUT environment
82# variable.
83
84
85# KBUILD_SRC is set on invocation of make in OBJ directory
86# KBUILD_SRC is not intended to be used by the regular user (for now)
87ifeq ($(KBUILD_SRC),)
88
89# OK, Make called in directory where kernel src resides
90# Do we want to locate output files in a separate directory?
91ifdef O
92 ifeq ("$(origin O)", "command line")
93 KBUILD_OUTPUT := $(O)
94 endif
95endif
96
97# That's our default target when none is given on the command line
Paul Smith4f193362006-03-05 17:14:10 -050098PHONY := _all
Linus Torvalds1da177e2005-04-16 15:20:36 -070099_all:
100
101ifneq ($(KBUILD_OUTPUT),)
102# Invoke a second make in the output directory, passing relevant variables
103# check that the output directory actually exists
104saved-output := $(KBUILD_OUTPUT)
105KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
106$(if $(KBUILD_OUTPUT),, \
107 $(error output directory "$(saved-output)" does not exist))
108
Paul Smith4f193362006-03-05 17:14:10 -0500109PHONY += $(MAKECMDGOALS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
Benjamin LaHaise36cbbe52006-02-15 15:17:35 -0800111$(filter-out _all,$(MAKECMDGOALS)) _all:
Sam Ravnborg23a45e22005-07-27 09:12:07 +0200112 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
113 KBUILD_SRC=$(CURDIR) \
Benjamin LaHaise36cbbe52006-02-15 15:17:35 -0800114 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile $@
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115
116# Leave processing to above invocation of make
117skip-makefile := 1
118endif # ifneq ($(KBUILD_OUTPUT),)
119endif # ifeq ($(KBUILD_SRC),)
120
121# We process the rest of the Makefile if this is the final invocation of make
122ifeq ($(skip-makefile),)
123
124# If building an external module we do not care about the all: rule
125# but instead _all depend on modules
Paul Smith4f193362006-03-05 17:14:10 -0500126PHONY += all
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127ifeq ($(KBUILD_EXTMOD),)
128_all: all
129else
130_all: modules
131endif
132
133srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
134TOPDIR := $(srctree)
135# FIXME - TOPDIR is obsolete, use srctree/objtree
136objtree := $(CURDIR)
137src := $(srctree)
138obj := $(objtree)
139
Mattia Dongili0f558c32006-02-19 13:50:37 +0100140VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
142export srctree objtree VPATH TOPDIR
143
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144
145# SUBARCH tells the usermode build what the underlying arch is. That is set
146# first, and if a usermode build is happening, the "ARCH=um" on the command
147# line overrides the setting of ARCH below. If a native build is happening,
148# then ARCH is assigned, getting whatever value it gets normally, and
149# SUBARCH is subsequently ignored.
150
151SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
152 -e s/arm.*/arm/ -e s/sa110/arm/ \
Linus Torvalds39990b52005-11-11 14:27:32 -0800153 -e s/s390x/s390/ -e s/parisc64/parisc/ \
Martin Michlmayr89992572006-01-28 18:38:15 +0000154 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
156# Cross compiling and selecting different set of gcc/bin-utils
157# ---------------------------------------------------------------------------
158#
159# When performing cross compilation for other architectures ARCH shall be set
160# to the target architecture. (See arch/* for the possibilities).
161# ARCH can be set during invocation of make:
162# make ARCH=ia64
163# Another way is to have ARCH set in the environment.
164# The default ARCH is the host where make is executed.
165
166# CROSS_COMPILE specify the prefix used for all executables used
167# during compilation. Only gcc and related bin-utils executables
168# are prefixed with $(CROSS_COMPILE).
169# CROSS_COMPILE can be set on the command line
170# make CROSS_COMPILE=ia64-linux-
171# Alternatively CROSS_COMPILE can be set in the environment.
172# Default value for CROSS_COMPILE is not to prefix executables
173# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
174
175ARCH ?= $(SUBARCH)
176CROSS_COMPILE ?=
177
178# Architecture as present in compile.h
179UTS_MACHINE := $(ARCH)
180
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700181KCONFIG_CONFIG ?= .config
182
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183# SHELL used by kbuild
184CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
185 else if [ -x /bin/bash ]; then echo /bin/bash; \
186 else echo sh; fi ; fi)
187
188HOSTCC = gcc
189HOSTCXX = g++
190HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
191HOSTCXXFLAGS = -O2
192
193# Decide whether to build built-in, modular, or both.
194# Normally, just do built-in.
195
196KBUILD_MODULES :=
197KBUILD_BUILTIN := 1
198
199# If we have only "make modules", don't compile built-in objects.
200# When we're building modules with modversions, we need to consider
201# the built-in objects during the descend as well, in order to
202# make sure the checksums are uptodate before we record them.
203
204ifeq ($(MAKECMDGOALS),modules)
205 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
206endif
207
208# If we have "make <whatever> modules", compile modules
209# in addition to whatever we do anyway.
210# Just "make" or "make all" shall build modules as well
211
212ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
213 KBUILD_MODULES := 1
214endif
215
216ifeq ($(MAKECMDGOALS),)
217 KBUILD_MODULES := 1
218endif
219
Sam Ravnborge579d352005-07-27 08:10:10 +0200220export KBUILD_MODULES KBUILD_BUILTIN
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
222
223# Beautify output
224# ---------------------------------------------------------------------------
225#
226# Normally, we echo the whole command before executing it. By making
227# that echo $($(quiet)$(cmd)), we now have the possibility to set
228# $(quiet) to choose other forms of output instead, e.g.
229#
230# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
231# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
232#
233# If $(quiet) is empty, the whole command will be printed.
234# If it is set to "quiet_", only the short version will be printed.
235# If it is set to "silent_", nothing wil be printed at all, since
236# the variable $(silent_cmd_cc_o_c) doesn't exist.
237#
Adrian Bunka58a4142006-01-10 00:08:17 +0100238# A simple variant is to prefix commands with $(Q) - that's useful
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239# for commands that shall be hidden in non-verbose mode.
240#
241# $(Q)ln $@ :<
242#
243# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
244# If KBUILD_VERBOSE equals 1 then the above command is displayed.
245
246ifeq ($(KBUILD_VERBOSE),1)
247 quiet =
248 Q =
249else
250 quiet=quiet_
251 Q = @
252endif
253
254# If the user is running make -s (silent mode), suppress echoing of
255# commands
256
257ifneq ($(findstring s,$(MAKEFLAGS)),)
258 quiet=silent_
259endif
260
261export quiet Q KBUILD_VERBOSE
262
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263
264# Look for make include files relative to root of kernel src
265MAKEFLAGS += --include-dir=$(srctree)
266
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000267# We need some generic definitions
Sam Ravnborg2a691472005-07-25 20:26:04 +0000268include $(srctree)/scripts/Kbuild.include
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000269
Sam Ravnborg566f81c2006-06-10 09:15:27 +0200270# Do not use make's built-in rules and variables
271# This increases performance and avoid hard-to-debug behaviour
272MAKEFLAGS += -rR
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273
274# Make variables (CC, etc...)
275
276AS = $(CROSS_COMPILE)as
277LD = $(CROSS_COMPILE)ld
278CC = $(CROSS_COMPILE)gcc
279CPP = $(CC) -E
280AR = $(CROSS_COMPILE)ar
281NM = $(CROSS_COMPILE)nm
282STRIP = $(CROSS_COMPILE)strip
283OBJCOPY = $(CROSS_COMPILE)objcopy
284OBJDUMP = $(CROSS_COMPILE)objdump
285AWK = awk
286GENKSYMS = scripts/genksyms/genksyms
287DEPMOD = /sbin/depmod
288KALLSYMS = scripts/kallsyms
289PERL = perl
290CHECK = sparse
291
Al Viroaf4ca452005-10-21 02:55:38 -0400292CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293MODFLAGS = -DMODULE
294CFLAGS_MODULE = $(MODFLAGS)
295AFLAGS_MODULE = $(MODFLAGS)
296LDFLAGS_MODULE = -r
297CFLAGS_KERNEL =
298AFLAGS_KERNEL =
299
300
301# Use LINUXINCLUDE when you must reference the include/ directory.
302# Needed to be compatible with the O= option
303LINUXINCLUDE := -Iinclude \
Russell King2dd34b42005-10-30 22:42:11 +0100304 $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
Zachary Amsdene623a3b2005-11-07 15:27:51 -0800305 -include include/linux/autoconf.h
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306
307CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE)
308
Olaf Hering3c521e02005-07-21 21:02:09 +0200309CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
Andi Kleen6edfba12006-03-25 16:29:49 +0100310 -fno-strict-aliasing -fno-common
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311AFLAGS := -D__ASSEMBLY__
312
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700313# Read KERNELRELEASE from include/config/kernel.release (if it exists)
314KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
Sam Ravnborg2244cbd2006-01-16 12:12:12 +0100315KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
Sam Ravnborgcb584552006-01-09 21:20:34 +0100316
Sam Ravnborg2244cbd2006-01-16 12:12:12 +0100317export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
319 CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
320 HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
321
322export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
323export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
324export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
325
326# When compiling out-of-tree modules, put MODVERDIR in the module
327# tree rather than in the kernel tree. The kernel tree might
328# even be read-only.
329export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
330
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331# Files to ignore in find ... statements
332
Trond Myklebust406119f2005-10-27 14:46:53 -0400333RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
334export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
336# ===========================================================================
337# Rules shared between *config targets and build targets
338
339# Basic helpers built in scripts/
Paul Smith4f193362006-03-05 17:14:10 -0500340PHONY += scripts_basic
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341scripts_basic:
342 $(Q)$(MAKE) $(build)=scripts/basic
343
Jan Beulichcd05e6b2005-09-06 11:47:04 +0200344# To avoid any implicit rule to kick in, define an empty command.
345scripts/basic/%: scripts_basic ;
346
Paul Smith4f193362006-03-05 17:14:10 -0500347PHONY += outputmakefile
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200348# outputmakefile generates a Makefile in the output directory, if using a
349# separate output directory. This allows convenient use of make in the
350# output directory.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351outputmakefile:
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200352ifneq ($(KBUILD_SRC),)
353 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
354 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
355endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356
357# To make sure we do not include .config for any of the *config targets
358# catch them early, and hand them over to scripts/kconfig/Makefile
359# It is allowed to specify more targets when calling make, including
360# mixing *config targets and build targets.
361# For example 'make oldconfig all'.
362# Detect when mixed targets is specified, and make a second invocation
363# of make so .config is not included in this case either (for *config).
364
365no-dot-config-targets := clean mrproper distclean \
Roman Zippelc30a02e2006-06-08 22:12:50 -0700366 cscope TAGS tags help %docs check% \
367 kernelrelease kernelversion
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368
369config-targets := 0
370mixed-targets := 0
371dot-config := 1
372
373ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
374 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
375 dot-config := 0
376 endif
377endif
378
379ifeq ($(KBUILD_EXTMOD),)
380 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
381 config-targets := 1
382 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
383 mixed-targets := 1
384 endif
385 endif
386endif
387
388ifeq ($(mixed-targets),1)
389# ===========================================================================
390# We're called with mixed targets (*config and build targets).
391# Handle them one by one.
392
393%:: FORCE
394 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
395
396else
397ifeq ($(config-targets),1)
398# ===========================================================================
399# *config targets only - make sure prerequisites are updated, and descend
400# in scripts/kconfig to make the *config target
401
402# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
403# KBUILD_DEFCONFIG may point out an alternative default configuration
404# used for 'make defconfig'
405include $(srctree)/arch/$(ARCH)/Makefile
406export KBUILD_DEFCONFIG
407
Jan Beulichcd05e6b2005-09-06 11:47:04 +0200408config %config: scripts_basic outputmakefile FORCE
Roman Zippelc955cca2006-06-08 22:12:39 -0700409 $(Q)mkdir -p include/linux include/config
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 $(Q)$(MAKE) $(build)=scripts/kconfig $@
411
412else
413# ===========================================================================
414# Build targets only - this includes vmlinux, arch specific targets, clean
415# targets and others. In general all targets except *config targets.
416
417ifeq ($(KBUILD_EXTMOD),)
418# Additional helpers built in scripts/
419# Carefully list dependencies so we do not try to build scripts twice
420# in parrallel
Paul Smith4f193362006-03-05 17:14:10 -0500421PHONY += scripts
Roman Zippel2e3646e2006-06-08 22:12:42 -0700422scripts: scripts_basic include/config/auto.conf
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 $(Q)$(MAKE) $(build)=$(@)
424
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425# Objects we will link into vmlinux / subdirs we need to visit
426init-y := init/
427drivers-y := drivers/ sound/
428net-y := net/
429libs-y := lib/
430core-y := usr/
431endif # KBUILD_EXTMOD
432
433ifeq ($(dot-config),1)
434# In this section, we need .config
435
436# Read in dependencies to all Kconfig* files, make sure to run
437# oldconfig if changes are detected.
Roman Zippelc955cca2006-06-08 22:12:39 -0700438-include include/config/auto.conf.cmd
439-include include/config/auto.conf
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441# To avoid any implicit rule to kick in, define an empty command
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700442$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443
Roman Zippelc955cca2006-06-08 22:12:39 -0700444# If .config is newer than include/config/auto.conf, someone tinkered
Sam Ravnborg752625c2005-12-26 23:34:03 +0100445# with it and forgot to run make oldconfig.
Roman Zippelc955cca2006-06-08 22:12:39 -0700446# if auto.conf.cmd is missing then we are probarly in a cleaned tree so
Sam Ravnborg752625c2005-12-26 23:34:03 +0100447# we execute the config step to be sure to catch updated Kconfig files
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700448include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
Roman Zippel3041e472006-06-18 21:09:09 -0700449ifeq ($(KBUILD_EXTMOD),)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
Roman Zippel3041e472006-06-18 21:09:09 -0700451else
452 $(error kernel configuration not valid - run 'make prepare' in $(srctree) to update it)
453endif
Roman Zippelc955cca2006-06-08 22:12:39 -0700454
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455else
456# Dummy target needed, because used as prerequisite
Roman Zippelc955cca2006-06-08 22:12:39 -0700457include/config/auto.conf: ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458endif
459
460# The all: target is the default when no target is given on the
461# command line.
462# This allow a user to issue only 'make' to build a kernel including modules
463# Defaults vmlinux but it is usually overriden in the arch makefile
464all: vmlinux
465
466ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
467CFLAGS += -Os
468else
469CFLAGS += -O2
470endif
471
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472ifdef CONFIG_FRAME_POINTER
Matthias Urlichs0030cbf2005-06-23 00:10:05 -0700473CFLAGS += -fno-omit-frame-pointer $(call cc-option,-fno-optimize-sibling-calls,)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474else
475CFLAGS += -fomit-frame-pointer
476endif
477
Jan Beulich604bf5a2006-03-24 03:16:19 -0800478ifdef CONFIG_UNWIND_INFO
479CFLAGS += -fasynchronous-unwind-tables
480endif
481
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482ifdef CONFIG_DEBUG_INFO
483CFLAGS += -g
484endif
485
486include $(srctree)/arch/$(ARCH)/Makefile
487
Sam Ravnborge8e69932005-04-30 16:51:42 -0700488# arch Makefile may override CC so keep this after arch Makefile is included
Rik van Riele8f5bdb2005-05-16 21:53:46 -0700489NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
Sam Ravnborge8e69932005-04-30 16:51:42 -0700490CHECKFLAGS += $(NOSTDINC_FLAGS)
491
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492# warn about C99 declaration after statement
493CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
494
495# disable pointer signedness warnings in gcc 4.0
496CFLAGS += $(call cc-option,-Wno-pointer-sign,)
497
498# Default kernel image to build when no specific target is given.
499# KBUILD_IMAGE may be overruled on the commandline or
500# set in the environment
501# Also any assignments in arch/$(ARCH)/Makefile take precedence over
502# this default value
503export KBUILD_IMAGE ?= vmlinux
504
505#
506# INSTALL_PATH specifies where to place the updated kernel and system map
507# images. Default is /boot, but you can set it to other values
508export INSTALL_PATH ?= /boot
509
510#
511# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
512# relocations required by build roots. This is not defined in the
513# makefile but the arguement can be passed to make if needed.
514#
515
Sam Ravnborgdf9df032006-01-16 12:46:07 +0100516MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517export MODLIB
518
Theodore Ts'oac031f22006-06-21 20:53:09 -0400519#
520# INSTALL_MOD_STRIP, if defined, will cause modules to be
521# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
522# the default option --strip-debug will be used. Otherwise,
523# INSTALL_MOD_STRIP will used as the options to the strip command.
524
525ifdef INSTALL_MOD_STRIP
526ifeq ($(INSTALL_MOD_STRIP),1)
527mod_strip_cmd = $STRIP) --strip-debug
528else
529mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
530endif # INSTALL_MOD_STRIP=1
531else
532mod_strip_cmd = true
533endif # INSTALL_MOD_STRIP
534export mod_strip_cmd
535
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536
537ifeq ($(KBUILD_EXTMOD),)
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100538core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539
540vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
541 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
542 $(net-y) $(net-m) $(libs-y) $(libs-m)))
543
544vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
545 $(init-n) $(init-) \
546 $(core-n) $(core-) $(drivers-n) $(drivers-) \
547 $(net-n) $(net-) $(libs-n) $(libs-))))
548
549init-y := $(patsubst %/, %/built-in.o, $(init-y))
550core-y := $(patsubst %/, %/built-in.o, $(core-y))
551drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
552net-y := $(patsubst %/, %/built-in.o, $(net-y))
553libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
554libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
555libs-y := $(libs-y1) $(libs-y2)
556
557# Build vmlinux
558# ---------------------------------------------------------------------------
559# vmlinux is build from the objects selected by $(vmlinux-init) and
560# $(vmlinux-main). Most are built-in.o files from top-level directories
561# in the kernel tree, others are specified in arch/$(ARCH)Makefile.
562# Ordering when linking is important, and $(vmlinux-init) must be first.
563#
564# vmlinux
565# ^
566# |
567# +-< $(vmlinux-init)
568# | +--< init/version.o + more
569# |
570# +--< $(vmlinux-main)
571# | +--< driver/built-in.o mm/built-in.o + more
572# |
573# +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
574#
575# vmlinux version (uname -v) cannot be updated during normal
576# descending-into-subdirs phase since we do not yet know if we need to
577# update vmlinux.
578# Therefore this step is delayed until just before final link of vmlinux -
579# except in the kallsyms case where it is done just before adding the
580# symbols to the kernel.
581#
582# System.map is generated to document addresses of all kernel symbols
583
584vmlinux-init := $(head-y) $(init-y)
585vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
586vmlinux-all := $(vmlinux-init) $(vmlinux-main)
587vmlinux-lds := arch/$(ARCH)/kernel/vmlinux.lds
588
589# Rule to link vmlinux - also used during CONFIG_KALLSYMS
590# May be overridden by arch/$(ARCH)/Makefile
591quiet_cmd_vmlinux__ ?= LD $@
592 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
593 -T $(vmlinux-lds) $(vmlinux-init) \
594 --start-group $(vmlinux-main) --end-group \
595 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
596
597# Generate new vmlinux version
598quiet_cmd_vmlinux_version = GEN .version
599 cmd_vmlinux_version = set -e; \
Jan Beulich4e25d8b2005-09-08 17:07:35 +0200600 if [ ! -r .version ]; then \
601 rm -f .version; \
602 echo 1 >.version; \
603 else \
604 mv .version .old_version; \
605 expr 0$$(cat .old_version) + 1 >.version; \
606 fi; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 $(MAKE) $(build)=init
608
609# Generate System.map
610quiet_cmd_sysmap = SYSMAP
611 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
612
613# Link of vmlinux
614# If CONFIG_KALLSYMS is set .version is already updated
615# Generate System.map and verify that the content is consistent
Mark Rustad39ca3712005-10-17 16:43:34 -0700616# Use + in front of the vmlinux_version rule to silent warning with make -j2
617# First command is ':' to allow us to use + in front of the rule
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618define rule_vmlinux__
Mark Rustad39ca3712005-10-17 16:43:34 -0700619 :
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
621
622 $(call cmd,vmlinux__)
623 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
624
625 $(Q)$(if $($(quiet)cmd_sysmap), \
626 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
627 $(cmd_sysmap) $@ System.map; \
628 if [ $$? -ne 0 ]; then \
629 rm -f $@; \
630 /bin/false; \
631 fi;
632 $(verify_kallsyms)
633endef
634
635
636ifdef CONFIG_KALLSYMS
637# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
638# It's a three stage process:
639# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
640# empty
641# Running kallsyms on that gives us .tmp_kallsyms1.o with
642# the right size - vmlinux version (uname -v) is updated during this step
643# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
644# but due to the added section, some addresses have shifted.
645# From here, we generate a correct .tmp_kallsyms2.o
646# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
647# o Verify that the System.map from vmlinux matches the map from
648# .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
649# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
650# .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
651# temporary bypass to allow the kernel to be built while the
652# maintainers work out what went wrong with kallsyms.
653
654ifdef CONFIG_KALLSYMS_EXTRA_PASS
655last_kallsyms := 3
656else
657last_kallsyms := 2
658endif
659
660kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
661
662define verify_kallsyms
663 $(Q)$(if $($(quiet)cmd_sysmap), \
664 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
665 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
666 $(Q)cmp -s System.map .tmp_System.map || \
667 (echo Inconsistent kallsyms data; \
668 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
669 rm .tmp_kallsyms* ; /bin/false )
670endef
671
672# Update vmlinux version before link
673# Use + in front of this rule to silent warning about make -j1
Sam Ravnborg72ba47c2005-07-27 11:39:37 +0200674# First command is ':' to allow us to use + in front of this rule
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675cmd_ksym_ld = $(cmd_vmlinux__)
676define rule_ksym_ld
Sam Ravnborg72ba47c2005-07-27 11:39:37 +0200677 :
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 +$(call cmd,vmlinux_version)
679 $(call cmd,vmlinux__)
680 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
681endef
682
683# Generate .S file with all kernel symbols
684quiet_cmd_kallsyms = KSYM $@
685 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
686 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
687
688.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
689 $(call if_changed_dep,as_o_S)
690
691.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
692 $(call cmd,kallsyms)
693
694# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
695.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
696 $(call if_changed_rule,ksym_ld)
697
698.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
699 $(call if_changed,vmlinux__)
700
701.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
702 $(call if_changed,vmlinux__)
703
704# Needs to visit scripts/ before $(KALLSYMS) can be used.
705$(KALLSYMS): scripts ;
706
Sam Ravnborg33bc25e2005-07-14 20:19:08 +0000707# Generate some data for debugging strange kallsyms problems
708debug_kallsyms: .tmp_map$(last_kallsyms)
709
710.tmp_map%: .tmp_vmlinux% FORCE
711 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
712
713.tmp_map3: .tmp_map2
714
715.tmp_map2: .tmp_map1
716
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717endif # ifdef CONFIG_KALLSYMS
718
719# vmlinux image - including updated kernel symbols
720vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
721 $(call if_changed_rule,vmlinux__)
Jan Beulich4e25d8b2005-09-08 17:07:35 +0200722 $(Q)rm -f .old_version
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723
724# The actual objects are generated when descending,
725# make sure no implicit rule kicks in
726$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
727
728# Handle descending into subdirectories listed in $(vmlinux-dirs)
729# Preset locale variables to speed up the build process. Limit locale
730# tweaks to this spot to avoid wrong language settings when running
731# make menuconfig etc.
732# Error messages still appears in the original language
733
Paul Smith4f193362006-03-05 17:14:10 -0500734PHONY += $(vmlinux-dirs)
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200735$(vmlinux-dirs): prepare scripts
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 $(Q)$(MAKE) $(build)=$@
737
Sam Ravnborgcb584552006-01-09 21:20:34 +0100738# Build the kernel release string
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700739# The KERNELRELEASE is stored in a file named include/config/kernel.release
Sam Ravnborgcb584552006-01-09 21:20:34 +0100740# to be used when executing for example make install or make modules_install
741#
742# Take the contents of any files called localversion* and the config
743# variable CONFIG_LOCALVERSION and append them to KERNELRELEASE.
744# LOCALVERSION from the command line override all of this
745
746nullstring :=
747space := $(nullstring) # end of line
748
749___localver = $(objtree)/localversion* $(srctree)/localversion*
750__localver = $(sort $(wildcard $(___localver)))
751# skip backup files (containing '~')
752_localver = $(foreach f, $(__localver), $(if $(findstring ~, $(f)),,$(f)))
753
754localver = $(subst $(space),, \
755 $(shell cat /dev/null $(_localver)) \
756 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
757
758# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
759# and if the SCM is know a tag from the SCM is appended.
760# The appended tag is determinded by the SCM used.
761#
762# Currently, only git is supported.
763# Other SCMs can edit scripts/setlocalversion and add the appropriate
764# checks as needed.
765ifdef CONFIG_LOCALVERSION_AUTO
766 _localver-auto = $(shell $(CONFIG_SHELL) \
767 $(srctree)/scripts/setlocalversion $(srctree))
768 localver-auto = $(LOCALVERSION)$(_localver-auto)
769endif
770
771localver-full = $(localver)$(localver-auto)
772
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700773# Store (new) KERNELRELASE string in include/config/kernel.release
Sam Ravnborg2244cbd2006-01-16 12:12:12 +0100774kernelrelease = $(KERNELVERSION)$(localver-full)
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700775include/config/kernel.release: include/config/auto.conf FORCE
Sam Ravnborg2244cbd2006-01-16 12:12:12 +0100776 $(Q)rm -f $@
777 $(Q)echo $(kernelrelease) > $@
Sam Ravnborgcb584552006-01-09 21:20:34 +0100778
779
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780# Things we need to do before we recursively start building the kernel
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200781# or the modules are listed in "prepare".
782# A multi level approach is used. prepareN is processed before prepareN-1.
783# archprepare is used in arch Makefiles and when processed asm symlink,
784# version.h and scripts_basic is processed / created.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200786# Listed in dependency order
Paul Smith4f193362006-03-05 17:14:10 -0500787PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200788
789# prepare-all is deprecated, use prepare as valid replacement
Paul Smith4f193362006-03-05 17:14:10 -0500790PHONY += prepare-all
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791
Sam Ravnborg86feeaa2005-09-09 19:28:28 +0200792# prepare3 is used to check if we are building in a separate output directory,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793# and if so do:
794# 1) Check that make has not been executed in the kernel src $(srctree)
795# 2) Create the include2 directory, used for the second asm symlink
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700796prepare3: include/config/kernel.release
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797ifneq ($(KBUILD_SRC),)
798 @echo ' Using $(srctree) as source for kernel'
Roman Zippelc955cca2006-06-08 22:12:39 -0700799 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 echo " $(srctree) is not clean, please run 'make mrproper'";\
801 echo " in the '$(srctree)' directory.";\
802 /bin/false; \
803 fi;
804 $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
805 $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
806endif
807
Sam Ravnborg86feeaa2005-09-09 19:28:28 +0200808# prepare2 creates a makefile if using a separate output directory
809prepare2: prepare3 outputmakefile
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810
Sam Ravnborg86feeaa2005-09-09 19:28:28 +0200811prepare1: prepare2 include/linux/version.h include/asm \
Roman Zippel2e3646e2006-06-08 22:12:42 -0700812 include/config/auto.conf
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813ifneq ($(KBUILD_MODULES),)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814 $(Q)mkdir -p $(MODVERDIR)
Pavel Roskinfca1dff2006-04-24 15:55:27 -0400815 $(Q)rm -f $(MODVERDIR)/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816endif
817
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200818archprepare: prepare1 scripts_basic
819
820prepare0: archprepare FORCE
Sam Ravnborg8d36a622005-09-10 21:05:36 +0200821 $(Q)$(MAKE) $(build)=.
Sam Ravnborg86feeaa2005-09-09 19:28:28 +0200822
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823# All the preparing..
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200824prepare prepare-all: prepare0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825
826# Leave this as default for preprocessing vmlinux.lds.S, which is now
827# done in arch/$(ARCH)/kernel/Makefile
828
829export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
830
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831# FIXME: The asm symlink changes when $(ARCH) changes. That's
832# hard to detect, but I suppose "make mrproper" is a good idea
833# before switching between archs anyway.
834
835include/asm:
836 @echo ' SYMLINK $@ -> include/asm-$(ARCH)'
837 $(Q)if [ ! -d include ]; then mkdir -p include; fi;
838 @ln -fsn asm-$(ARCH) $@
839
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840# Generate some files
841# ---------------------------------------------------------------------------
842
843# KERNELRELEASE can change from a few different places, meaning version.h
844# needs to be updated, so this check is forced on all builds
845
846uts_len := 64
847
848define filechk_version.h
849 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
850 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
851 exit 1; \
852 fi; \
853 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
854 echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
855 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
856 )
857endef
858
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700859include/linux/version.h: $(srctree)/Makefile include/config/kernel.release FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 $(call filechk,version.h)
861
862# ---------------------------------------------------------------------------
863
Paul Smith4f193362006-03-05 17:14:10 -0500864PHONY += depend dep
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865depend dep:
866 @echo '*** Warning: make $@ is unnecessary now.'
867
868# ---------------------------------------------------------------------------
869# Modules
870
871ifdef CONFIG_MODULES
872
873# By default, build modules as well
874
875all: modules
876
877# Build modules
878
Paul Smith4f193362006-03-05 17:14:10 -0500879PHONY += modules
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
881 @echo ' Building modules, stage 2.';
882 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
883
884
885# Target to prepare building external modules
Paul Smith4f193362006-03-05 17:14:10 -0500886PHONY += modules_prepare
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200887modules_prepare: prepare scripts
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888
889# Target to install modules
Paul Smith4f193362006-03-05 17:14:10 -0500890PHONY += modules_install
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891modules_install: _modinst_ _modinst_post
892
Paul Smith4f193362006-03-05 17:14:10 -0500893PHONY += _modinst_
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894_modinst_:
Tom Rinice454d42005-07-15 07:56:36 -0700895 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 echo "Warning: you may need to install module-init-tools"; \
897 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
898 sleep 1; \
899 fi
900 @rm -rf $(MODLIB)/kernel
901 @rm -f $(MODLIB)/source
902 @mkdir -p $(MODLIB)/kernel
903 @ln -s $(srctree) $(MODLIB)/source
904 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
905 rm -f $(MODLIB)/build ; \
906 ln -s $(objtree) $(MODLIB)/build ; \
907 fi
908 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
909
910# If System.map exists, run depmod. This deliberately does not have a
911# dependency on System.map since that would run the dependency tree on
912# vmlinux. This depmod is only for convenience to give the initial
913# boot a modules.dep even before / is mounted read-write. However the
914# boot script depmod is the master version.
915ifeq "$(strip $(INSTALL_MOD_PATH))" ""
916depmod_opts :=
917else
918depmod_opts := -b $(INSTALL_MOD_PATH) -r
919endif
Paul Smith4f193362006-03-05 17:14:10 -0500920PHONY += _modinst_post
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921_modinst_post: _modinst_
922 if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
923
924else # CONFIG_MODULES
925
926# Modules not configured
927# ---------------------------------------------------------------------------
928
929modules modules_install: FORCE
930 @echo
931 @echo "The present kernel configuration has modules disabled."
932 @echo "Type 'make config' and enable loadable module support."
933 @echo "Then build a kernel with module support enabled."
934 @echo
935 @exit 1
936
937endif # CONFIG_MODULES
938
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939###
940# Cleaning is done on three levels.
941# make clean Delete most generated files
942# Leave enough to build external modules
943# make mrproper Delete the current configuration, and all generated files
944# make distclean Remove editor backup files, patch leftover files and the like
945
946# Directories & files removed with 'make clean'
947CLEAN_DIRS += $(MODVERDIR)
948CLEAN_FILES += vmlinux System.map \
949 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
950
951# Directories & files removed with 'make mrproper'
952MRPROPER_DIRS += include/config include2
Tore Anderson50aa88e2006-01-07 15:34:40 +0100953MRPROPER_FILES += .config .config.old include/asm .version .old_version \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954 include/linux/autoconf.h include/linux/version.h \
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700955 Module.symvers tags TAGS cscope*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956
957# clean - Delete most, but leave enough to build external modules
958#
959clean: rm-dirs := $(CLEAN_DIRS)
960clean: rm-files := $(CLEAN_FILES)
Sam Ravnborg86feeaa2005-09-09 19:28:28 +0200961clean-dirs := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962
Paul Smith4f193362006-03-05 17:14:10 -0500963PHONY += $(clean-dirs) clean archclean
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964$(clean-dirs):
965 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
966
967clean: archclean $(clean-dirs)
968 $(call cmd,rmdirs)
969 $(call cmd,rmfiles)
970 @find . $(RCS_FIND_IGNORE) \
971 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
972 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
973 -type f -print | xargs rm -f
974
975# mrproper - Delete all generated files, including .config
976#
977mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
978mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
979mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
980
Paul Smith4f193362006-03-05 17:14:10 -0500981PHONY += $(mrproper-dirs) mrproper archmrproper
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982$(mrproper-dirs):
983 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
984
985mrproper: clean archmrproper $(mrproper-dirs)
986 $(call cmd,rmdirs)
987 $(call cmd,rmfiles)
988
989# distclean
990#
Paul Smith4f193362006-03-05 17:14:10 -0500991PHONY += distclean
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992
993distclean: mrproper
994 @find $(srctree) $(RCS_FIND_IGNORE) \
995 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
996 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
997 -o -name '.*.rej' -o -size 0 \
998 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
999 -type f -print | xargs rm -f
1000
1001
1002# Packaging of the kernel to various formats
1003# ---------------------------------------------------------------------------
1004# rpm target kept for backward compatibility
1005package-dir := $(srctree)/scripts/package
1006
Zach Brown031ecc62006-06-08 22:12:37 -07001007%pkg: include/config/kernel.release FORCE
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001008 $(Q)$(MAKE) $(build)=$(package-dir) $@
Zach Brown031ecc62006-06-08 22:12:37 -07001009rpm: include/config/kernel.release FORCE
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001010 $(Q)$(MAKE) $(build)=$(package-dir) $@
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011
1012
1013# Brief documentation of the typical targets used
1014# ---------------------------------------------------------------------------
1015
1016boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1017boards := $(notdir $(boards))
1018
1019help:
1020 @echo 'Cleaning targets:'
1021 @echo ' clean - remove most generated files but keep the config'
1022 @echo ' mrproper - remove all generated files + config + various backup files'
1023 @echo ''
1024 @echo 'Configuration targets:'
1025 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1026 @echo ''
1027 @echo 'Other generic targets:'
1028 @echo ' all - Build all targets marked with [*]'
1029 @echo '* vmlinux - Build the bare kernel'
1030 @echo '* modules - Build all modules'
Bodo Eggert9cc5d742005-11-23 20:11:34 +01001031 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032 @echo ' dir/ - Build all files in dir and below'
1033 @echo ' dir/file.[ois] - Build specified target only'
Sam Ravnborg155ad602005-07-07 17:56:08 -07001034 @echo ' dir/file.ko - Build module including final link'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035 @echo ' rpm - Build a kernel as an RPM package'
1036 @echo ' tags/TAGS - Generate tags file for editors'
1037 @echo ' cscope - Generate cscope index'
Zach Brown6d128842005-09-07 12:08:23 -07001038 @echo ' kernelrelease - Output the release version string'
Sam Ravnborgcb584552006-01-09 21:20:34 +01001039 @echo ' kernelversion - Output the version stored in Makefile'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040 @echo ''
1041 @echo 'Static analysers'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 @echo ' checkstack - Generate a list of stack hogs'
1043 @echo ' namespacecheck - Name space analysis on compiled kernel'
1044 @echo ''
1045 @echo 'Kernel packaging:'
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001046 @$(MAKE) $(build)=$(package-dir) help
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047 @echo ''
1048 @echo 'Documentation targets:'
1049 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1050 @echo ''
1051 @echo 'Architecture specific targets ($(ARCH)):'
1052 @$(if $(archhelp),$(archhelp),\
1053 echo ' No architecture specific help defined for $(ARCH)')
1054 @echo ''
1055 @$(if $(boards), \
1056 $(foreach b, $(boards), \
1057 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1058 echo '')
1059
1060 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1061 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1062 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse)'
1063 @echo ' make C=2 [targets] Force check of all c source with $$CHECK (sparse)'
1064 @echo ''
1065 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1066 @echo 'For further info see the ./README file'
1067
1068
1069# Documentation targets
1070# ---------------------------------------------------------------------------
1071%docs: scripts_basic FORCE
1072 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1073
1074else # KBUILD_EXTMOD
1075
1076###
1077# External module support.
1078# When building external modules the kernel used as basis is considered
1079# read-only, and no consistency checks are made and the make
1080# system is not used on the basis kernel. If updates are required
1081# in the basis kernel ordinary make commands (without M=...) must
1082# be used.
1083#
1084# The following are the only valid targets when building external
1085# modules.
1086# make M=dir clean Delete all automatically generated files
1087# make M=dir modules Make all modules in specified dir
1088# make M=dir Same as 'make M=dir modules'
1089# make M=dir modules_install
1090# Install the modules build in the module directory
1091# Assumes install directory is already created
1092
1093# We are always building modules
1094KBUILD_MODULES := 1
Paul Smith4f193362006-03-05 17:14:10 -05001095PHONY += crmodverdir
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096crmodverdir:
1097 $(Q)mkdir -p $(MODVERDIR)
Pavel Roskinfca1dff2006-04-24 15:55:27 -04001098 $(Q)rm -f $(MODVERDIR)/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099
Paul Smith4f193362006-03-05 17:14:10 -05001100PHONY += $(objtree)/Module.symvers
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101$(objtree)/Module.symvers:
1102 @test -e $(objtree)/Module.symvers || ( \
1103 echo; \
1104 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1105 echo " is missing; modules will have no dependencies and modversions."; \
1106 echo )
1107
1108module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
Paul Smith4f193362006-03-05 17:14:10 -05001109PHONY += $(module-dirs) modules
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110$(module-dirs): crmodverdir $(objtree)/Module.symvers
1111 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1112
1113modules: $(module-dirs)
1114 @echo ' Building modules, stage 2.';
1115 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1116
Paul Smith4f193362006-03-05 17:14:10 -05001117PHONY += modules_install
Sam Ravnborga67dc212006-01-28 23:51:57 +01001118modules_install: _emodinst_ _emodinst_post
Adrian Bunke6304662006-02-14 15:58:15 +01001119
Paul Smith4f193362006-03-05 17:14:10 -05001120install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1121PHONY += _emodinst_
Sam Ravnborga67dc212006-01-28 23:51:57 +01001122_emodinst_:
Sam Ravnborga67dc212006-01-28 23:51:57 +01001123 $(Q)mkdir -p $(MODLIB)/$(install-dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
1125
Sam Ravnborga67dc212006-01-28 23:51:57 +01001126# Run depmod only is we have System.map and depmod is executable
1127quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1128 cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \
1129 $(DEPMOD) -ae -F System.map \
1130 $(if $(strip $(INSTALL_MOD_PATH)), \
1131 -b $(INSTALL_MOD_PATH) -r) \
1132 $(KERNELRELEASE); \
1133 fi
1134
Paul Smith4f193362006-03-05 17:14:10 -05001135PHONY += _emodinst_post
Sam Ravnborga67dc212006-01-28 23:51:57 +01001136_emodinst_post: _emodinst_
1137 $(call cmd,depmod)
1138
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1140
Paul Smith4f193362006-03-05 17:14:10 -05001141PHONY += $(clean-dirs) clean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142$(clean-dirs):
1143 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1144
1145clean: rm-dirs := $(MODVERDIR)
1146clean: $(clean-dirs)
1147 $(call cmd,rmdirs)
1148 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1149 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1150 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1151 -type f -print | xargs rm -f
1152
1153help:
1154 @echo ' Building external modules.'
1155 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1156 @echo ''
1157 @echo ' modules - default target, build the module(s)'
1158 @echo ' modules_install - install the module'
1159 @echo ' clean - remove generated files in module directory only'
1160 @echo ''
Sam Ravnborg06300b22006-01-25 07:13:18 +01001161
1162# Dummies...
Paul Smith4f193362006-03-05 17:14:10 -05001163PHONY += prepare scripts
Sam Ravnborg06300b22006-01-25 07:13:18 +01001164prepare: ;
1165scripts: ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166endif # KBUILD_EXTMOD
1167
1168# Generate tags for editors
1169# ---------------------------------------------------------------------------
1170
1171#We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1172#(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1173#Adding $(srctree) adds about 20M on i386 to the size of the output file!
1174
George Anzingerf182ae62005-07-07 17:56:06 -07001175ifeq ($(src),$(obj))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176__srctree =
1177else
1178__srctree = $(srctree)/
1179endif
1180
Paolo 'Blaisorblade' Giarrusso2ab23c92005-11-13 16:07:00 -08001181ifeq ($(ALLSOURCE_ARCHS),)
1182ifeq ($(ARCH),um)
1183ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1184else
1185ALLINCLUDE_ARCHS := $(ARCH)
1186endif
1187else
1188#Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1189ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1190endif
1191
Ian Campbella0674e82005-06-23 11:25:54 +01001192ALLSOURCE_ARCHS := $(ARCH)
1193
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194define all-sources
1195 ( find $(__srctree) $(RCS_FIND_IGNORE) \
1196 \( -name include -o -name arch \) -prune -o \
1197 -name '*.[chS]' -print; \
Ian Campbella0674e82005-06-23 11:25:54 +01001198 for ARCH in $(ALLSOURCE_ARCHS) ; do \
1199 find $(__srctree)arch/$${ARCH} $(RCS_FIND_IGNORE) \
1200 -name '*.[chS]' -print; \
1201 done ; \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202 find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1203 -name '*.[chS]' -print; \
1204 find $(__srctree)include $(RCS_FIND_IGNORE) \
1205 \( -name config -o -name 'asm-*' \) -prune \
1206 -o -name '*.[chS]' -print; \
Paolo 'Blaisorblade' Giarrusso2ab23c92005-11-13 16:07:00 -08001207 for ARCH in $(ALLINCLUDE_ARCHS) ; do \
Ian Campbella0674e82005-06-23 11:25:54 +01001208 find $(__srctree)include/asm-$${ARCH} $(RCS_FIND_IGNORE) \
1209 -name '*.[chS]' -print; \
1210 done ; \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211 find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1212 -name '*.[chS]' -print )
1213endef
1214
1215quiet_cmd_cscope-file = FILELST cscope.files
Karl Hegbloomacbef452005-06-19 00:50:47 -07001216 cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217
1218quiet_cmd_cscope = MAKE cscope.out
Karl Hegbloomacbef452005-06-19 00:50:47 -07001219 cmd_cscope = cscope -b
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220
1221cscope: FORCE
1222 $(call cmd,cscope-file)
1223 $(call cmd,cscope)
1224
1225quiet_cmd_TAGS = MAKE $@
Sam Ravnborg66d609e2005-07-28 23:11:34 +02001226define cmd_TAGS
1227 rm -f $@; \
Samuel Thibault54e08a22005-12-26 02:47:18 +01001228 ETAGSF=`etags --version | grep -i exuberant >/dev/null && \
1229 echo "-I __initdata,__exitdata,__acquires,__releases \
1230 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1231 --extra=+f --c-kinds=+px"`; \
John Kacurf6333eb2005-10-29 00:25:13 -04001232 $(all-sources) | xargs etags $$ETAGSF -a
Sam Ravnborg66d609e2005-07-28 23:11:34 +02001233endef
Linus Torvalds1da177e2005-04-16 15:20:36 -07001234
Sam Ravnborg66d609e2005-07-28 23:11:34 +02001235TAGS: FORCE
1236 $(call cmd,TAGS)
1237
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238
1239quiet_cmd_tags = MAKE $@
1240define cmd_tags
1241 rm -f $@; \
Samuel Thibault54e08a22005-12-26 02:47:18 +01001242 CTAGSF=`ctags --version | grep -i exuberant >/dev/null && \
1243 echo "-I __initdata,__exitdata,__acquires,__releases \
1244 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1245 --extra=+f --c-kinds=+px"`; \
John Kacurf6333eb2005-10-29 00:25:13 -04001246 $(all-sources) | xargs ctags $$CTAGSF -a
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247endef
1248
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249tags: FORCE
1250 $(call cmd,tags)
1251
1252
1253# Scripts to check various things for consistency
1254# ---------------------------------------------------------------------------
1255
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256includecheck:
1257 find * $(RCS_FIND_IGNORE) \
1258 -name '*.[hcS]' -type f -print | sort \
1259 | xargs $(PERL) -w scripts/checkincludes.pl
1260
1261versioncheck:
1262 find * $(RCS_FIND_IGNORE) \
1263 -name '*.[hcS]' -type f -print | sort \
1264 | xargs $(PERL) -w scripts/checkversion.pl
1265
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266namespacecheck:
1267 $(PERL) $(srctree)/scripts/namespace.pl
1268
1269endif #ifeq ($(config-targets),1)
1270endif #ifeq ($(mixed-targets),1)
1271
Roman Zippelc30a02e2006-06-08 22:12:50 -07001272PHONY += checkstack kernelrelease kernelversion
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273checkstack:
1274 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1275 $(PERL) $(src)/scripts/checkstack.pl $(ARCH)
1276
1277kernelrelease:
Roman Zippelf1d28fb2006-06-08 22:12:43 -07001278 $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1279 $(error kernelrelease not valid - run 'make prepare' to update it))
Sam Ravnborgcb584552006-01-09 21:20:34 +01001280kernelversion:
Sam Ravnborg2244cbd2006-01-16 12:12:12 +01001281 @echo $(KERNELVERSION)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001282
Sam Ravnborg06300b22006-01-25 07:13:18 +01001283# Single targets
1284# ---------------------------------------------------------------------------
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001285# Single targets are compatible with:
1286# - build whith mixed source and output
1287# - build with separate output dir 'make O=...'
1288# - external modules
1289#
1290# target-dir => where to store outputfile
1291# build-dir => directory in kernel source tree to use
Sam Ravnborg06300b22006-01-25 07:13:18 +01001292
Sam Ravnborg06300b22006-01-25 07:13:18 +01001293ifeq ($(KBUILD_EXTMOD),)
Sam Ravnborgaa360872006-04-06 08:25:31 +02001294 build-dir = $(patsubst %/,%,$(dir $@))
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001295 target-dir = $(dir $@)
Sam Ravnborg06300b22006-01-25 07:13:18 +01001296else
1297 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001298 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1299 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
Sam Ravnborg06300b22006-01-25 07:13:18 +01001300endif
1301
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001302%.s: %.c prepare scripts FORCE
1303 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1304%.i: %.c prepare scripts FORCE
1305 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1306%.o: %.c prepare scripts FORCE
1307 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1308%.lst: %.c prepare scripts FORCE
1309 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1310%.s: %.S prepare scripts FORCE
1311 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1312%.o: %.S prepare scripts FORCE
1313 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1314
1315# Modules
1316/ %/: prepare scripts FORCE
Sam Ravnborg06300b22006-01-25 07:13:18 +01001317 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001318 $(build)=$(build-dir)
1319%.ko: prepare scripts FORCE
Sam Ravnborg06300b22006-01-25 07:13:18 +01001320 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001321 $(build)=$(build-dir) $(@:.ko=.o)
Sam Ravnborg06300b22006-01-25 07:13:18 +01001322 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1323
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324# FIXME Should go into a make.lib or something
1325# ===========================================================================
1326
1327quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1328 cmd_rmdirs = rm -rf $(rm-dirs)
1329
1330quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1331 cmd_rmfiles = rm -f $(rm-files)
1332
1333
1334a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1335 $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1336 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
1337
1338quiet_cmd_as_o_S = AS $@
1339cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1340
1341# read all saved command lines
1342
1343targets := $(wildcard $(sort $(targets)))
1344cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1345
1346ifneq ($(cmd_files),)
1347 $(cmd_files): ; # Do not try to update included dependency files
1348 include $(cmd_files)
1349endif
1350
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1352# Usage:
1353# $(Q)$(MAKE) $(clean)=dir
1354clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1355
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356endif # skip-makefile
1357
Paul Smith4f193362006-03-05 17:14:10 -05001358PHONY += FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359FORCE:
Paul Smith4f193362006-03-05 17:14:10 -05001360
1361
1362# Declare the contents of the .PHONY variable as phony. We keep that
1363# information in a variable se we can use it in if_changed and friends.
1364.PHONY: $(PHONY)