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Linus Torvalds1da177e2005-04-16 15:20:36 -07001VERSION = 2
2PATCHLEVEL = 6
Linus Torvaldsf695baf2007-07-22 13:41:00 -07003SUBLEVEL = 23
Linus Torvaldsbbf25010f2007-10-09 13:31:38 -07004EXTRAVERSION =
Linus Torvalds81cfe792007-09-19 16:01:13 -07005NAME = Arr Matey! A Hairy Bilge Rat!
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
Oleg Verych15964862006-12-10 02:18:40 -080013# Do not:
14# o use make's built-in rules and variables
15# (this increases performance and avoid hard-to-debug behavour);
16# o print "Entering directory ...";
17MAKEFLAGS += -rR --no-print-directory
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
19# We are using a recursive build, so we need to do a little thinking
20# to get the ordering right.
21#
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.
29#
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.
34
35# To put more focus on warnings, be less verbose as default
36# Use 'make V=1' to see the full commands
37
38ifdef V
39 ifeq ("$(origin V)", "command line")
40 KBUILD_VERBOSE = $(V)
41 endif
42endif
43ifndef KBUILD_VERBOSE
44 KBUILD_VERBOSE = 0
45endif
46
Robert P. J. Day1c7bafe2006-09-13 07:57:50 -040047# Call a source code checker (by default, "sparse") as part of the
48# C compilation.
49#
50# Use 'make C=1' to enable checking of only re-compiled files.
51# Use 'make C=2' to enable checking of *all* source files, regardless
52# of whether they are re-compiled or not.
53#
54# See the file "Documentation/sparse.txt" for more details, including
55# where to get the "sparse" utility.
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
57ifdef C
58 ifeq ("$(origin C)", "command line")
59 KBUILD_CHECKSRC = $(C)
60 endif
61endif
62ifndef KBUILD_CHECKSRC
63 KBUILD_CHECKSRC = 0
64endif
65
66# Use make M=dir to specify directory of external module to build
67# Old syntax make ... SUBDIRS=$PWD is still supported
68# Setting the environment variable KBUILD_EXTMOD take precedence
69ifdef SUBDIRS
70 KBUILD_EXTMOD ?= $(SUBDIRS)
71endif
72ifdef M
73 ifeq ("$(origin M)", "command line")
74 KBUILD_EXTMOD := $(M)
75 endif
76endif
77
78
79# kbuild supports saving output files in a separate directory.
80# To locate output files in a separate directory two syntaxes are supported.
81# In both cases the working directory must be the root of the kernel src.
82# 1) O=
83# Use "make O=dir/to/store/output/files/"
Sam Ravnborg070b98b2006-06-25 00:07:55 +020084#
Linus Torvalds1da177e2005-04-16 15:20:36 -070085# 2) Set KBUILD_OUTPUT
86# Set the environment variable KBUILD_OUTPUT to point to the directory
87# where the output files shall be placed.
88# export KBUILD_OUTPUT=dir/to/store/output/files/
89# make
90#
91# The O= assignment takes precedence over the KBUILD_OUTPUT environment
92# variable.
93
94
95# KBUILD_SRC is set on invocation of make in OBJ directory
96# KBUILD_SRC is not intended to be used by the regular user (for now)
97ifeq ($(KBUILD_SRC),)
98
99# OK, Make called in directory where kernel src resides
100# Do we want to locate output files in a separate directory?
101ifdef O
102 ifeq ("$(origin O)", "command line")
103 KBUILD_OUTPUT := $(O)
104 endif
105endif
106
107# That's our default target when none is given on the command line
Paul Smith4f193362006-03-05 17:14:10 -0500108PHONY := _all
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109_all:
110
111ifneq ($(KBUILD_OUTPUT),)
112# Invoke a second make in the output directory, passing relevant variables
113# check that the output directory actually exists
114saved-output := $(KBUILD_OUTPUT)
115KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
116$(if $(KBUILD_OUTPUT),, \
117 $(error output directory "$(saved-output)" does not exist))
Sam Ravnborg4f1127e2007-09-26 19:38:44 +0200118# Check that OUTPUT directory is not the same as where we have kernel src
119$(if $(filter-out $(KBUILD_OUTPUT),$(shell /bin/pwd)),, \
120 $(error Output directory (O=...) specifies kernel src dir))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
Milton Miller0b357862007-09-21 18:09:02 -0500122PHONY += $(MAKECMDGOALS) sub-make
123
124$(filter-out _all sub-make,$(MAKECMDGOALS)) _all: sub-make
125 $(Q)@:
126
127sub-make: FORCE
Sam Ravnborg23a45e22005-07-27 09:12:07 +0200128 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
129 KBUILD_SRC=$(CURDIR) \
Milton Miller0b357862007-09-21 18:09:02 -0500130 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
131 $(filter-out _all sub-make,$(MAKECMDGOALS))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
133# Leave processing to above invocation of make
134skip-makefile := 1
135endif # ifneq ($(KBUILD_OUTPUT),)
136endif # ifeq ($(KBUILD_SRC),)
137
138# We process the rest of the Makefile if this is the final invocation of make
139ifeq ($(skip-makefile),)
140
141# If building an external module we do not care about the all: rule
142# but instead _all depend on modules
Paul Smith4f193362006-03-05 17:14:10 -0500143PHONY += all
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144ifeq ($(KBUILD_EXTMOD),)
145_all: all
146else
147_all: modules
148endif
149
150srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
151TOPDIR := $(srctree)
152# FIXME - TOPDIR is obsolete, use srctree/objtree
153objtree := $(CURDIR)
154src := $(srctree)
155obj := $(objtree)
156
Mattia Dongili0f558c32006-02-19 13:50:37 +0100157VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
159export srctree objtree VPATH TOPDIR
160
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
162# SUBARCH tells the usermode build what the underlying arch is. That is set
163# first, and if a usermode build is happening, the "ARCH=um" on the command
164# line overrides the setting of ARCH below. If a native build is happening,
165# then ARCH is assigned, getting whatever value it gets normally, and
166# SUBARCH is subsequently ignored.
167
168SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
169 -e s/arm.*/arm/ -e s/sa110/arm/ \
Linus Torvalds39990b52005-11-11 14:27:32 -0800170 -e s/s390x/s390/ -e s/parisc64/parisc/ \
Martin Michlmayr89992572006-01-28 18:38:15 +0000171 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172
173# Cross compiling and selecting different set of gcc/bin-utils
174# ---------------------------------------------------------------------------
175#
176# When performing cross compilation for other architectures ARCH shall be set
177# to the target architecture. (See arch/* for the possibilities).
178# ARCH can be set during invocation of make:
179# make ARCH=ia64
180# Another way is to have ARCH set in the environment.
181# The default ARCH is the host where make is executed.
182
183# CROSS_COMPILE specify the prefix used for all executables used
184# during compilation. Only gcc and related bin-utils executables
185# are prefixed with $(CROSS_COMPILE).
186# CROSS_COMPILE can be set on the command line
187# make CROSS_COMPILE=ia64-linux-
188# Alternatively CROSS_COMPILE can be set in the environment.
189# Default value for CROSS_COMPILE is not to prefix executables
190# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
191
192ARCH ?= $(SUBARCH)
193CROSS_COMPILE ?=
194
195# Architecture as present in compile.h
Thomas Gleixner6752ed92007-10-11 11:11:36 +0200196UTS_MACHINE := $(ARCH)
197SRCARCH := $(ARCH)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700199KCONFIG_CONFIG ?= .config
200
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201# SHELL used by kbuild
202CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
203 else if [ -x /bin/bash ]; then echo /bin/bash; \
204 else echo sh; fi ; fi)
205
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200206HOSTCC = gcc
207HOSTCXX = g++
208HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
209HOSTCXXFLAGS = -O2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200211# Decide whether to build built-in, modular, or both.
212# Normally, just do built-in.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213
214KBUILD_MODULES :=
215KBUILD_BUILTIN := 1
216
217# If we have only "make modules", don't compile built-in objects.
218# When we're building modules with modversions, we need to consider
219# the built-in objects during the descend as well, in order to
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200220# make sure the checksums are up to date before we record them.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221
222ifeq ($(MAKECMDGOALS),modules)
223 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
224endif
225
226# If we have "make <whatever> modules", compile modules
227# in addition to whatever we do anyway.
228# Just "make" or "make all" shall build modules as well
229
230ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
231 KBUILD_MODULES := 1
232endif
233
234ifeq ($(MAKECMDGOALS),)
235 KBUILD_MODULES := 1
236endif
237
Sam Ravnborge579d352005-07-27 08:10:10 +0200238export KBUILD_MODULES KBUILD_BUILTIN
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
240
241# Beautify output
242# ---------------------------------------------------------------------------
243#
244# Normally, we echo the whole command before executing it. By making
245# that echo $($(quiet)$(cmd)), we now have the possibility to set
246# $(quiet) to choose other forms of output instead, e.g.
247#
248# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
249# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
250#
251# If $(quiet) is empty, the whole command will be printed.
252# If it is set to "quiet_", only the short version will be printed.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200253# If it is set to "silent_", nothing will be printed at all, since
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254# the variable $(silent_cmd_cc_o_c) doesn't exist.
255#
Adrian Bunka58a4142006-01-10 00:08:17 +0100256# A simple variant is to prefix commands with $(Q) - that's useful
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257# for commands that shall be hidden in non-verbose mode.
258#
259# $(Q)ln $@ :<
260#
261# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
262# If KBUILD_VERBOSE equals 1 then the above command is displayed.
263
264ifeq ($(KBUILD_VERBOSE),1)
265 quiet =
266 Q =
267else
268 quiet=quiet_
269 Q = @
270endif
271
272# If the user is running make -s (silent mode), suppress echoing of
273# commands
274
275ifneq ($(findstring s,$(MAKEFLAGS)),)
276 quiet=silent_
277endif
278
279export quiet Q KBUILD_VERBOSE
280
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281
282# Look for make include files relative to root of kernel src
283MAKEFLAGS += --include-dir=$(srctree)
284
Oleg Verych15964862006-12-10 02:18:40 -0800285# We need some generic definitions.
286include $(srctree)/scripts/Kbuild.include
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287
288# Make variables (CC, etc...)
289
290AS = $(CROSS_COMPILE)as
291LD = $(CROSS_COMPILE)ld
292CC = $(CROSS_COMPILE)gcc
293CPP = $(CC) -E
294AR = $(CROSS_COMPILE)ar
295NM = $(CROSS_COMPILE)nm
296STRIP = $(CROSS_COMPILE)strip
297OBJCOPY = $(CROSS_COMPILE)objcopy
298OBJDUMP = $(CROSS_COMPILE)objdump
299AWK = awk
300GENKSYMS = scripts/genksyms/genksyms
301DEPMOD = /sbin/depmod
302KALLSYMS = scripts/kallsyms
303PERL = perl
304CHECK = sparse
305
Al Viroaf4ca452005-10-21 02:55:38 -0400306CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307MODFLAGS = -DMODULE
308CFLAGS_MODULE = $(MODFLAGS)
309AFLAGS_MODULE = $(MODFLAGS)
Roland McGrath114f5152007-07-23 01:12:08 -0700310LDFLAGS_MODULE =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311CFLAGS_KERNEL =
312AFLAGS_KERNEL =
313
314
315# Use LINUXINCLUDE when you must reference the include/ directory.
316# Needed to be compatible with the O= option
317LINUXINCLUDE := -Iinclude \
Russell King2dd34b42005-10-30 22:42:11 +0100318 $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
Zachary Amsdene623a3b2005-11-07 15:27:51 -0800319 -include include/linux/autoconf.h
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320
321CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE)
322
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200323KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
Dave Jones94bed2a2007-07-15 23:41:38 -0700324 -fno-strict-aliasing -fno-common \
325 -Werror-implicit-function-declaration
Sam Ravnborg222d3942007-10-15 21:59:31 +0200326KBUILD_AFLAGS := -D__ASSEMBLY__
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700328# Read KERNELRELEASE from include/config/kernel.release (if it exists)
329KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
Sam Ravnborg2244cbd2006-01-16 12:12:12 +0100330KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
Sam Ravnborgcb584552006-01-09 21:20:34 +0100331
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200332export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
Thomas Gleixner6752ed92007-10-11 11:11:36 +0200333export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200334export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
335export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336
337export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200338export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
Sam Ravnborg222d3942007-10-15 21:59:31 +0200339export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340
341# When compiling out-of-tree modules, put MODVERDIR in the module
342# tree rather than in the kernel tree. The kernel tree might
343# even be read-only.
344export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
345
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346# Files to ignore in find ... statements
347
Trond Myklebust406119f2005-10-27 14:46:53 -0400348RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
349export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350
351# ===========================================================================
352# Rules shared between *config targets and build targets
353
354# Basic helpers built in scripts/
Paul Smith4f193362006-03-05 17:14:10 -0500355PHONY += scripts_basic
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356scripts_basic:
357 $(Q)$(MAKE) $(build)=scripts/basic
358
Jan Beulichcd05e6b2005-09-06 11:47:04 +0200359# To avoid any implicit rule to kick in, define an empty command.
360scripts/basic/%: scripts_basic ;
361
Paul Smith4f193362006-03-05 17:14:10 -0500362PHONY += outputmakefile
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200363# outputmakefile generates a Makefile in the output directory, if using a
364# separate output directory. This allows convenient use of make in the
365# output directory.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366outputmakefile:
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200367ifneq ($(KBUILD_SRC),)
368 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
369 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
370endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371
372# To make sure we do not include .config for any of the *config targets
373# catch them early, and hand them over to scripts/kconfig/Makefile
374# It is allowed to specify more targets when calling make, including
375# mixing *config targets and build targets.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200376# For example 'make oldconfig all'.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377# Detect when mixed targets is specified, and make a second invocation
378# of make so .config is not included in this case either (for *config).
379
Roman Zippel3eb3c742007-01-10 14:45:28 +0100380no-dot-config-targets := clean mrproper distclean \
Roman Zippelc30a02e2006-06-08 22:12:50 -0700381 cscope TAGS tags help %docs check% \
Roman Zippel3eb3c742007-01-10 14:45:28 +0100382 include/linux/version.h headers_% \
383 kernelrelease kernelversion
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384
385config-targets := 0
386mixed-targets := 0
387dot-config := 1
388
389ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
390 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
391 dot-config := 0
392 endif
393endif
394
395ifeq ($(KBUILD_EXTMOD),)
396 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
397 config-targets := 1
398 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
399 mixed-targets := 1
400 endif
401 endif
402endif
403
404ifeq ($(mixed-targets),1)
405# ===========================================================================
406# We're called with mixed targets (*config and build targets).
407# Handle them one by one.
408
409%:: FORCE
410 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
411
412else
413ifeq ($(config-targets),1)
414# ===========================================================================
415# *config targets only - make sure prerequisites are updated, and descend
416# in scripts/kconfig to make the *config target
417
418# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
419# KBUILD_DEFCONFIG may point out an alternative default configuration
420# used for 'make defconfig'
421include $(srctree)/arch/$(ARCH)/Makefile
422export KBUILD_DEFCONFIG
423
Jan Beulichcd05e6b2005-09-06 11:47:04 +0200424config %config: scripts_basic outputmakefile FORCE
Roman Zippelc955cca2006-06-08 22:12:39 -0700425 $(Q)mkdir -p include/linux include/config
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 $(Q)$(MAKE) $(build)=scripts/kconfig $@
427
428else
429# ===========================================================================
430# Build targets only - this includes vmlinux, arch specific targets, clean
431# targets and others. In general all targets except *config targets.
432
433ifeq ($(KBUILD_EXTMOD),)
434# Additional helpers built in scripts/
435# Carefully list dependencies so we do not try to build scripts twice
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200436# in parallel
Paul Smith4f193362006-03-05 17:14:10 -0500437PHONY += scripts
Roman Zippel2e3646e2006-06-08 22:12:42 -0700438scripts: scripts_basic include/config/auto.conf
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 $(Q)$(MAKE) $(build)=$(@)
440
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441# Objects we will link into vmlinux / subdirs we need to visit
442init-y := init/
443drivers-y := drivers/ sound/
444net-y := net/
445libs-y := lib/
446core-y := usr/
447endif # KBUILD_EXTMOD
448
449ifeq ($(dot-config),1)
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200450# Read in config
451-include include/config/auto.conf
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200453ifeq ($(KBUILD_EXTMOD),)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454# Read in dependencies to all Kconfig* files, make sure to run
455# oldconfig if changes are detected.
Roman Zippelc955cca2006-06-08 22:12:39 -0700456-include include/config/auto.conf.cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458# To avoid any implicit rule to kick in, define an empty command
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700459$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460
Roman Zippelc955cca2006-06-08 22:12:39 -0700461# If .config is newer than include/config/auto.conf, someone tinkered
Sam Ravnborg752625c2005-12-26 23:34:03 +0100462# with it and forgot to run make oldconfig.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200463# if auto.conf.cmd is missing then we are probably in a cleaned tree so
Sam Ravnborg752625c2005-12-26 23:34:03 +0100464# we execute the config step to be sure to catch updated Kconfig files
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700465include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
467else
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200468# external modules needs include/linux/autoconf.h and include/config/auto.conf
469# but do not care if they are up-to-date. Use auto.conf to trigger the test
470PHONY += include/config/auto.conf
471
472include/config/auto.conf:
473 $(Q)test -e include/linux/autoconf.h -a -e $@ || ( \
474 echo; \
475 echo " ERROR: Kernel configuration is invalid."; \
476 echo " include/linux/autoconf.h or $@ are missing."; \
477 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
478 echo; \
479 /bin/false)
480
481endif # KBUILD_EXTMOD
Roman Zippelc955cca2006-06-08 22:12:39 -0700482
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483else
484# Dummy target needed, because used as prerequisite
Roman Zippelc955cca2006-06-08 22:12:39 -0700485include/config/auto.conf: ;
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200486endif # $(dot-config)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487
488# The all: target is the default when no target is given on the
489# command line.
490# This allow a user to issue only 'make' to build a kernel including modules
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200491# Defaults vmlinux but it is usually overridden in the arch makefile
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492all: vmlinux
493
494ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200495KBUILD_CFLAGS += -Os
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496else
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200497KBUILD_CFLAGS += -O2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498endif
499
Sam Ravnborgc9eca0b2006-08-16 21:14:08 +0200500include $(srctree)/arch/$(ARCH)/Makefile
501
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502ifdef CONFIG_FRAME_POINTER
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200503KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504else
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200505KBUILD_CFLAGS += -fomit-frame-pointer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506endif
507
508ifdef CONFIG_DEBUG_INFO
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200509KBUILD_CFLAGS += -g
Sam Ravnborg222d3942007-10-15 21:59:31 +0200510KBUILD_AFLAGS += -gdwarf-2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511endif
512
Sam Ravnborgc9eca0b2006-08-16 21:14:08 +0200513# Force gcc to behave correct even for buggy distributions
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200514KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515
Sam Ravnborge8e69932005-04-30 16:51:42 -0700516# arch Makefile may override CC so keep this after arch Makefile is included
Rik van Riele8f5bdb02005-05-16 21:53:46 -0700517NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
Sam Ravnborge8e69932005-04-30 16:51:42 -0700518CHECKFLAGS += $(NOSTDINC_FLAGS)
519
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520# warn about C99 declaration after statement
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200521KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200523# disable pointer signed / unsigned warnings in gcc 4.0
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200524KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525
Sam Ravnborg52bcc332007-10-15 22:03:58 +0200526# Add user supplied AFLAGS and CFLAGS as the last assignments
527KBUILD_AFLAGS += $(AFLAGS)
528KBUILD_CFLAGS += $(CFLAGS)
529
Roland McGrath18991192007-07-19 01:48:40 -0700530# Use --build-id when available.
531LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
532 $(call ld-option, -Wl$(comma)--build-id,))
533LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
534LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
535
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536# Default kernel image to build when no specific target is given.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200537# KBUILD_IMAGE may be overruled on the command line or
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538# set in the environment
539# Also any assignments in arch/$(ARCH)/Makefile take precedence over
540# this default value
541export KBUILD_IMAGE ?= vmlinux
542
543#
544# INSTALL_PATH specifies where to place the updated kernel and system map
545# images. Default is /boot, but you can set it to other values
546export INSTALL_PATH ?= /boot
547
548#
549# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
550# relocations required by build roots. This is not defined in the
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200551# makefile but the argument can be passed to make if needed.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552#
553
Sam Ravnborgdf9df032006-01-16 12:46:07 +0100554MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555export MODLIB
556
Theodore Ts'oac031f22006-06-21 20:53:09 -0400557#
558# INSTALL_MOD_STRIP, if defined, will cause modules to be
559# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
560# the default option --strip-debug will be used. Otherwise,
561# INSTALL_MOD_STRIP will used as the options to the strip command.
562
563ifdef INSTALL_MOD_STRIP
564ifeq ($(INSTALL_MOD_STRIP),1)
Andreas Schwabe3402212006-07-05 18:57:48 +0200565mod_strip_cmd = $(STRIP) --strip-debug
Theodore Ts'oac031f22006-06-21 20:53:09 -0400566else
567mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
568endif # INSTALL_MOD_STRIP=1
569else
570mod_strip_cmd = true
571endif # INSTALL_MOD_STRIP
572export mod_strip_cmd
573
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574
575ifeq ($(KBUILD_EXTMOD),)
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100576core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577
578vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
579 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
580 $(net-y) $(net-m) $(libs-y) $(libs-m)))
581
582vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
583 $(init-n) $(init-) \
584 $(core-n) $(core-) $(drivers-n) $(drivers-) \
585 $(net-n) $(net-) $(libs-n) $(libs-))))
586
587init-y := $(patsubst %/, %/built-in.o, $(init-y))
588core-y := $(patsubst %/, %/built-in.o, $(core-y))
589drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
590net-y := $(patsubst %/, %/built-in.o, $(net-y))
591libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
592libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
593libs-y := $(libs-y1) $(libs-y2)
594
595# Build vmlinux
596# ---------------------------------------------------------------------------
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200597# vmlinux is built from the objects selected by $(vmlinux-init) and
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598# $(vmlinux-main). Most are built-in.o files from top-level directories
Uwe Zeisberger24625662006-10-05 16:24:45 +0200599# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600# Ordering when linking is important, and $(vmlinux-init) must be first.
601#
602# vmlinux
603# ^
604# |
605# +-< $(vmlinux-init)
606# | +--< init/version.o + more
607# |
608# +--< $(vmlinux-main)
609# | +--< driver/built-in.o mm/built-in.o + more
610# |
611# +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
612#
613# vmlinux version (uname -v) cannot be updated during normal
614# descending-into-subdirs phase since we do not yet know if we need to
615# update vmlinux.
616# Therefore this step is delayed until just before final link of vmlinux -
617# except in the kallsyms case where it is done just before adding the
618# symbols to the kernel.
619#
620# System.map is generated to document addresses of all kernel symbols
621
622vmlinux-init := $(head-y) $(init-y)
623vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
624vmlinux-all := $(vmlinux-init) $(vmlinux-main)
Thomas Gleixner6752ed92007-10-11 11:11:36 +0200625vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
Sam Ravnborg85bd2fd2007-02-26 15:33:52 +0100626export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627
628# Rule to link vmlinux - also used during CONFIG_KALLSYMS
629# May be overridden by arch/$(ARCH)/Makefile
630quiet_cmd_vmlinux__ ?= LD $@
631 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
632 -T $(vmlinux-lds) $(vmlinux-init) \
633 --start-group $(vmlinux-main) --end-group \
Sam Ravnborg741f98f2007-07-17 10:54:06 +0200634 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635
636# Generate new vmlinux version
637quiet_cmd_vmlinux_version = GEN .version
638 cmd_vmlinux_version = set -e; \
Jan Beulich4e25d8b2005-09-08 17:07:35 +0200639 if [ ! -r .version ]; then \
640 rm -f .version; \
641 echo 1 >.version; \
642 else \
643 mv .version .old_version; \
644 expr 0$$(cat .old_version) + 1 >.version; \
645 fi; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 $(MAKE) $(build)=init
647
648# Generate System.map
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200649quiet_cmd_sysmap = SYSMAP
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
651
652# Link of vmlinux
653# If CONFIG_KALLSYMS is set .version is already updated
654# Generate System.map and verify that the content is consistent
Mark Rustad39ca3712005-10-17 16:43:34 -0700655# Use + in front of the vmlinux_version rule to silent warning with make -j2
656# First command is ':' to allow us to use + in front of the rule
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657define rule_vmlinux__
Mark Rustad39ca3712005-10-17 16:43:34 -0700658 :
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
660
661 $(call cmd,vmlinux__)
662 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
663
Sam Ravnborg46352812006-08-08 21:41:18 +0200664 $(Q)$(if $($(quiet)cmd_sysmap), \
665 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
666 $(cmd_sysmap) $@ System.map; \
667 if [ $$? -ne 0 ]; then \
668 rm -f $@; \
669 /bin/false; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670 fi;
671 $(verify_kallsyms)
672endef
673
674
675ifdef CONFIG_KALLSYMS
676# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
677# It's a three stage process:
678# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
679# empty
680# Running kallsyms on that gives us .tmp_kallsyms1.o with
681# the right size - vmlinux version (uname -v) is updated during this step
682# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
683# but due to the added section, some addresses have shifted.
684# From here, we generate a correct .tmp_kallsyms2.o
685# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
686# o Verify that the System.map from vmlinux matches the map from
687# .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
688# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
689# .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
690# temporary bypass to allow the kernel to be built while the
691# maintainers work out what went wrong with kallsyms.
692
693ifdef CONFIG_KALLSYMS_EXTRA_PASS
694last_kallsyms := 3
695else
696last_kallsyms := 2
697endif
698
699kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
700
701define verify_kallsyms
Sam Ravnborg46352812006-08-08 21:41:18 +0200702 $(Q)$(if $($(quiet)cmd_sysmap), \
703 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
Sam Ravnborg46352812006-08-08 21:41:18 +0200705 $(Q)cmp -s System.map .tmp_System.map || \
706 (echo Inconsistent kallsyms data; \
707 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 rm .tmp_kallsyms* ; /bin/false )
709endef
710
711# Update vmlinux version before link
712# Use + in front of this rule to silent warning about make -j1
Sam Ravnborg72ba47c2005-07-27 11:39:37 +0200713# First command is ':' to allow us to use + in front of this rule
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714cmd_ksym_ld = $(cmd_vmlinux__)
715define rule_ksym_ld
Sam Ravnborg72ba47c2005-07-27 11:39:37 +0200716 :
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 +$(call cmd,vmlinux_version)
718 $(call cmd,vmlinux__)
719 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
720endef
721
722# Generate .S file with all kernel symbols
723quiet_cmd_kallsyms = KSYM $@
724 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
725 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
726
727.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
728 $(call if_changed_dep,as_o_S)
729
730.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
731 $(call cmd,kallsyms)
732
733# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
734.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
735 $(call if_changed_rule,ksym_ld)
736
737.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
738 $(call if_changed,vmlinux__)
739
740.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
741 $(call if_changed,vmlinux__)
742
743# Needs to visit scripts/ before $(KALLSYMS) can be used.
744$(KALLSYMS): scripts ;
745
Sam Ravnborg33bc25e2005-07-14 20:19:08 +0000746# Generate some data for debugging strange kallsyms problems
747debug_kallsyms: .tmp_map$(last_kallsyms)
748
749.tmp_map%: .tmp_vmlinux% FORCE
750 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
751
752.tmp_map3: .tmp_map2
753
754.tmp_map2: .tmp_map1
755
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756endif # ifdef CONFIG_KALLSYMS
757
Sam Ravnborg741f98f2007-07-17 10:54:06 +0200758# Do modpost on a prelinked vmlinux. The finally linked vmlinux has
759# relevant sections renamed as per the linker script.
760quiet_cmd_vmlinux-modpost = LD $@
761 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
762 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
763 $(filter-out $(vmlinux-init) $(vmlinux-main) $(vmlinux-lds) FORCE ,$^)
764define rule_vmlinux-modpost
765 :
766 +$(call cmd,vmlinux-modpost)
767 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
768 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
769endef
770
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771# vmlinux image - including updated kernel symbols
Sam Ravnborg741f98f2007-07-17 10:54:06 +0200772vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) vmlinux.o FORCE
David Woodhouse0f836e52006-10-11 01:21:43 -0700773ifdef CONFIG_HEADERS_CHECK
David Woodhouse0e7af8d042006-10-13 16:04:23 +0100774 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
David Woodhouse0f836e52006-10-11 01:21:43 -0700775endif
Sam Ravnborg741f98f2007-07-17 10:54:06 +0200776 $(call vmlinux-modpost)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777 $(call if_changed_rule,vmlinux__)
Jan Beulich4e25d8b2005-09-08 17:07:35 +0200778 $(Q)rm -f .old_version
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779
Sam Ravnborg741f98f2007-07-17 10:54:06 +0200780vmlinux.o: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
781 $(call if_changed_rule,vmlinux-modpost)
782
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783# The actual objects are generated when descending,
784# make sure no implicit rule kicks in
785$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
786
787# Handle descending into subdirectories listed in $(vmlinux-dirs)
788# Preset locale variables to speed up the build process. Limit locale
789# tweaks to this spot to avoid wrong language settings when running
790# make menuconfig etc.
791# Error messages still appears in the original language
792
Paul Smith4f193362006-03-05 17:14:10 -0500793PHONY += $(vmlinux-dirs)
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200794$(vmlinux-dirs): prepare scripts
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 $(Q)$(MAKE) $(build)=$@
796
Sam Ravnborgcb584552006-01-09 21:20:34 +0100797# Build the kernel release string
Sam Ravnborgcb584552006-01-09 21:20:34 +0100798#
Robert P. J. Day1ef98852006-09-12 12:38:19 -0400799# The KERNELRELEASE value built here is stored in the file
800# include/config/kernel.release, and is used when executing several
801# make targets, such as "make install" or "make modules_install."
802#
803# The eventual kernel release string consists of the following fields,
804# shown in a hierarchical format to show how smaller parts are concatenated
805# to form the larger and final value, with values coming from places like
806# the Makefile, kernel config options, make command line options and/or
807# SCM tag information.
808#
809# $(KERNELVERSION)
810# $(VERSION) eg, 2
811# $(PATCHLEVEL) eg, 6
812# $(SUBLEVEL) eg, 18
813# $(EXTRAVERSION) eg, -rc6
814# $(localver-full)
815# $(localver)
Oleg Verych76c32952007-02-06 02:18:22 +0100816# localversion* (files without backups, containing '~')
Robert P. J. Day1ef98852006-09-12 12:38:19 -0400817# $(CONFIG_LOCALVERSION) (from kernel config setting)
818# $(localver-auto) (only if CONFIG_LOCALVERSION_AUTO is set)
819# ./scripts/setlocalversion (SCM tag, if one exists)
820# $(LOCALVERSION) (from make command line if provided)
821#
822# Note how the final $(localver-auto) string is included *only* if the
823# kernel config option CONFIG_LOCALVERSION_AUTO is selected. Also, at the
824# moment, only git is supported but other SCMs can edit the script
825# scripts/setlocalversion and add the appropriate checks as needed.
Sam Ravnborgcb584552006-01-09 21:20:34 +0100826
Oleg Verych76c32952007-02-06 02:18:22 +0100827pattern = ".*/localversion[^~]*"
828string = $(shell cat /dev/null \
Linus Torvaldsfd19e442007-02-12 15:05:15 -0800829 `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
Sam Ravnborgcb584552006-01-09 21:20:34 +0100830
Oleg Verych76c32952007-02-06 02:18:22 +0100831localver = $(subst $(space),, $(string) \
832 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200833
Sam Ravnborgcb584552006-01-09 21:20:34 +0100834# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
835# and if the SCM is know a tag from the SCM is appended.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200836# The appended tag is determined by the SCM used.
Sam Ravnborgcb584552006-01-09 21:20:34 +0100837#
838# Currently, only git is supported.
839# Other SCMs can edit scripts/setlocalversion and add the appropriate
840# checks as needed.
841ifdef CONFIG_LOCALVERSION_AUTO
842 _localver-auto = $(shell $(CONFIG_SHELL) \
843 $(srctree)/scripts/setlocalversion $(srctree))
844 localver-auto = $(LOCALVERSION)$(_localver-auto)
845endif
846
847localver-full = $(localver)$(localver-auto)
848
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700849# Store (new) KERNELRELASE string in include/config/kernel.release
Sam Ravnborg2244cbd2006-01-16 12:12:12 +0100850kernelrelease = $(KERNELVERSION)$(localver-full)
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700851include/config/kernel.release: include/config/auto.conf FORCE
Sam Ravnborg2244cbd2006-01-16 12:12:12 +0100852 $(Q)rm -f $@
853 $(Q)echo $(kernelrelease) > $@
Sam Ravnborgcb584552006-01-09 21:20:34 +0100854
855
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856# Things we need to do before we recursively start building the kernel
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200857# or the modules are listed in "prepare".
858# A multi level approach is used. prepareN is processed before prepareN-1.
859# archprepare is used in arch Makefiles and when processed asm symlink,
860# version.h and scripts_basic is processed / created.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200862# Listed in dependency order
Paul Smith4f193362006-03-05 17:14:10 -0500863PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200864
Sam Ravnborg86feeaa2005-09-09 19:28:28 +0200865# prepare3 is used to check if we are building in a separate output directory,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866# and if so do:
867# 1) Check that make has not been executed in the kernel src $(srctree)
868# 2) Create the include2 directory, used for the second asm symlink
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700869prepare3: include/config/kernel.release
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870ifneq ($(KBUILD_SRC),)
871 @echo ' Using $(srctree) as source for kernel'
Roman Zippelc955cca2006-06-08 22:12:39 -0700872 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873 echo " $(srctree) is not clean, please run 'make mrproper'";\
874 echo " in the '$(srctree)' directory.";\
875 /bin/false; \
876 fi;
877 $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
Thomas Gleixner96a388d2007-10-11 11:20:03 +0200878 $(Q)ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879endif
880
Sam Ravnborg86feeaa2005-09-09 19:28:28 +0200881# prepare2 creates a makefile if using a separate output directory
882prepare2: prepare3 outputmakefile
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883
Roman Zippel3eb3c742007-01-10 14:45:28 +0100884prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
885 include/asm include/config/auto.conf
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886ifneq ($(KBUILD_MODULES),)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 $(Q)mkdir -p $(MODVERDIR)
Pavel Roskinfca1dff2006-04-24 15:55:27 -0400888 $(Q)rm -f $(MODVERDIR)/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889endif
890
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200891archprepare: prepare1 scripts_basic
892
893prepare0: archprepare FORCE
Sam Ravnborg8d36a622005-09-10 21:05:36 +0200894 $(Q)$(MAKE) $(build)=.
Sam Ravnborgc53aeca2007-03-27 22:50:29 +0200895 $(Q)$(MAKE) $(build)=. missing-syscalls
Sam Ravnborg86feeaa2005-09-09 19:28:28 +0200896
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897# All the preparing..
Robert P. J. Dayd395efb2007-02-14 00:33:01 -0800898prepare: prepare0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200900# Leave this as default for preprocessing vmlinux.lds.S, which is now
901# done in arch/$(ARCH)/kernel/Makefile
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902
903export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
904
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200905# FIXME: The asm symlink changes when $(ARCH) changes. That's
906# hard to detect, but I suppose "make mrproper" is a good idea
907# before switching between archs anyway.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908
909include/asm:
Thomas Gleixner96a388d2007-10-11 11:20:03 +0200910 @echo ' SYMLINK $@ -> include/asm-$(SRCARCH)'
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911 $(Q)if [ ! -d include ]; then mkdir -p include; fi;
Thomas Gleixner96a388d2007-10-11 11:20:03 +0200912 @ln -fsn asm-$(SRCARCH) $@
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914# Generate some files
915# ---------------------------------------------------------------------------
916
917# KERNELRELEASE can change from a few different places, meaning version.h
918# needs to be updated, so this check is forced on all builds
919
920uts_len := 64
Sam Ravnborg63104ee2006-07-03 23:30:54 +0200921define filechk_utsrelease.h
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
Sam Ravnborg63104ee2006-07-03 23:30:54 +0200923 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
924 exit 1; \
925 fi; \
926 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927endef
928
Sam Ravnborg63104ee2006-07-03 23:30:54 +0200929define filechk_version.h
930 (echo \#define LINUX_VERSION_CODE $(shell \
931 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
932 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
933endef
934
935include/linux/version.h: $(srctree)/Makefile FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936 $(call filechk,version.h)
937
Sam Ravnborg63104ee2006-07-03 23:30:54 +0200938include/linux/utsrelease.h: include/config/kernel.release FORCE
939 $(call filechk,utsrelease.h)
940
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941# ---------------------------------------------------------------------------
942
Paul Smith4f193362006-03-05 17:14:10 -0500943PHONY += depend dep
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944depend dep:
945 @echo '*** Warning: make $@ is unnecessary now.'
946
947# ---------------------------------------------------------------------------
David Woodhouse8d730cf2006-06-18 11:58:39 +0100948# Kernel headers
David Woodhouse1ab7a1f2006-09-16 12:15:55 -0700949INSTALL_HDR_PATH=$(objtree)/usr
David Woodhouse8d730cf2006-06-18 11:58:39 +0100950export INSTALL_HDR_PATH
951
Thomas Gleixner96a388d2007-10-11 11:20:03 +0200952HDRFILTER=generic i386 x86_64
953HDRARCHES=$(filter-out $(HDRFILTER),$(patsubst $(srctree)/include/asm-%/Kbuild,%,$(wildcard $(srctree)/include/asm-*/Kbuild)))
David Woodhouse6d716272006-09-24 22:16:03 +0100954
955PHONY += headers_install_all
Roman Zippel3eb3c742007-01-10 14:45:28 +0100956headers_install_all: include/linux/version.h scripts_basic FORCE
Linus Torvalds398477d2006-09-24 14:55:52 -0700957 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
David Woodhouse6d716272006-09-24 22:16:03 +0100958 $(Q)for arch in $(HDRARCHES); do \
Linus Torvalds398477d2006-09-24 14:55:52 -0700959 $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch ;\
David Woodhouse6d716272006-09-24 22:16:03 +0100960 done
961
David Woodhouse8d730cf2006-06-18 11:58:39 +0100962PHONY += headers_install
Roman Zippel3eb3c742007-01-10 14:45:28 +0100963headers_install: include/linux/version.h scripts_basic FORCE
Thomas Gleixner96a388d2007-10-11 11:20:03 +0200964 @if [ ! -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
965 echo '*** Error: Headers not exportable for this architecture ($(SRCARCH))'; \
David Woodhousef17b7ba2006-09-21 09:01:45 +0100966 exit 1 ; fi
Sam Ravnborg07aea3a2006-07-23 20:47:50 +0200967 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
Thomas Gleixner96a388d2007-10-11 11:20:03 +0200968 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include
David Woodhouse8d730cf2006-06-18 11:58:39 +0100969
Mike Frysinger1f857122007-02-14 00:33:02 -0800970PHONY += headers_check_all
971headers_check_all: headers_install_all
972 $(Q)for arch in $(HDRARCHES); do \
973 $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch HDRCHECK=1 ;\
974 done
975
David Woodhouse68475352006-06-18 12:02:10 +0100976PHONY += headers_check
977headers_check: headers_install
Thomas Gleixner96a388d2007-10-11 11:20:03 +0200978 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include HDRCHECK=1
David Woodhouse68475352006-06-18 12:02:10 +0100979
David Woodhouse8d730cf2006-06-18 11:58:39 +0100980# ---------------------------------------------------------------------------
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981# Modules
982
983ifdef CONFIG_MODULES
984
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200985# By default, build modules as well
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986
987all: modules
988
989# Build modules
990
Paul Smith4f193362006-03-05 17:14:10 -0500991PHONY += modules
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
993 @echo ' Building modules, stage 2.';
Sam Ravnborgb805aa02006-08-08 21:36:08 +0200994 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995
996
997# Target to prepare building external modules
Paul Smith4f193362006-03-05 17:14:10 -0500998PHONY += modules_prepare
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200999modules_prepare: prepare scripts
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000
1001# Target to install modules
Paul Smith4f193362006-03-05 17:14:10 -05001002PHONY += modules_install
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003modules_install: _modinst_ _modinst_post
1004
Paul Smith4f193362006-03-05 17:14:10 -05001005PHONY += _modinst_
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006_modinst_:
Tom Rinice454d42005-07-15 07:56:36 -07001007 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008 echo "Warning: you may need to install module-init-tools"; \
1009 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1010 sleep 1; \
1011 fi
1012 @rm -rf $(MODLIB)/kernel
1013 @rm -f $(MODLIB)/source
1014 @mkdir -p $(MODLIB)/kernel
1015 @ln -s $(srctree) $(MODLIB)/source
1016 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1017 rm -f $(MODLIB)/build ; \
1018 ln -s $(objtree) $(MODLIB)/build ; \
1019 fi
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001020 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021
1022# If System.map exists, run depmod. This deliberately does not have a
1023# dependency on System.map since that would run the dependency tree on
1024# vmlinux. This depmod is only for convenience to give the initial
1025# boot a modules.dep even before / is mounted read-write. However the
1026# boot script depmod is the master version.
1027ifeq "$(strip $(INSTALL_MOD_PATH))" ""
1028depmod_opts :=
1029else
1030depmod_opts := -b $(INSTALL_MOD_PATH) -r
1031endif
Paul Smith4f193362006-03-05 17:14:10 -05001032PHONY += _modinst_post
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033_modinst_post: _modinst_
1034 if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
1035
1036else # CONFIG_MODULES
1037
1038# Modules not configured
1039# ---------------------------------------------------------------------------
1040
1041modules modules_install: FORCE
1042 @echo
1043 @echo "The present kernel configuration has modules disabled."
1044 @echo "Type 'make config' and enable loadable module support."
1045 @echo "Then build a kernel with module support enabled."
1046 @echo
1047 @exit 1
1048
1049endif # CONFIG_MODULES
1050
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051###
1052# Cleaning is done on three levels.
1053# make clean Delete most generated files
1054# Leave enough to build external modules
1055# make mrproper Delete the current configuration, and all generated files
1056# make distclean Remove editor backup files, patch leftover files and the like
1057
1058# Directories & files removed with 'make clean'
1059CLEAN_DIRS += $(MODVERDIR)
1060CLEAN_FILES += vmlinux System.map \
1061 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1062
1063# Directories & files removed with 'make mrproper'
David Woodhouse1ab7a1f2006-09-16 12:15:55 -07001064MRPROPER_DIRS += include/config include2 usr/include
Tore Anderson50aa88e2006-01-07 15:34:40 +01001065MRPROPER_FILES += .config .config.old include/asm .version .old_version \
Roman Zippel3eb3c742007-01-10 14:45:28 +01001066 include/linux/autoconf.h include/linux/version.h \
1067 include/linux/utsrelease.h \
Roman Zippelf1d28fb2006-06-08 22:12:43 -07001068 Module.symvers tags TAGS cscope*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069
1070# clean - Delete most, but leave enough to build external modules
1071#
1072clean: rm-dirs := $(CLEAN_DIRS)
1073clean: rm-files := $(CLEAN_FILES)
Sam Ravnborg86feeaa2005-09-09 19:28:28 +02001074clean-dirs := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075
Paul Smith4f193362006-03-05 17:14:10 -05001076PHONY += $(clean-dirs) clean archclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077$(clean-dirs):
1078 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1079
1080clean: archclean $(clean-dirs)
1081 $(call cmd,rmdirs)
1082 $(call cmd,rmfiles)
1083 @find . $(RCS_FIND_IGNORE) \
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001084 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
Andreas Gruenbacher15fde672006-05-09 20:37:30 +02001085 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1086 -o -name '*.symtypes' \) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087 -type f -print | xargs rm -f
1088
1089# mrproper - Delete all generated files, including .config
1090#
1091mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1092mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1093mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1094
Paul Smith4f193362006-03-05 17:14:10 -05001095PHONY += $(mrproper-dirs) mrproper archmrproper
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096$(mrproper-dirs):
1097 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1098
1099mrproper: clean archmrproper $(mrproper-dirs)
1100 $(call cmd,rmdirs)
1101 $(call cmd,rmfiles)
1102
1103# distclean
1104#
Paul Smith4f193362006-03-05 17:14:10 -05001105PHONY += distclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106
1107distclean: mrproper
1108 @find $(srctree) $(RCS_FIND_IGNORE) \
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001109 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001111 -o -name '.*.rej' -o -size 0 \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1113 -type f -print | xargs rm -f
1114
1115
1116# Packaging of the kernel to various formats
1117# ---------------------------------------------------------------------------
1118# rpm target kept for backward compatibility
1119package-dir := $(srctree)/scripts/package
1120
Zach Brown031ecc62006-06-08 22:12:37 -07001121%pkg: include/config/kernel.release FORCE
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001122 $(Q)$(MAKE) $(build)=$(package-dir) $@
Zach Brown031ecc62006-06-08 22:12:37 -07001123rpm: include/config/kernel.release FORCE
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001124 $(Q)$(MAKE) $(build)=$(package-dir) $@
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125
1126
1127# Brief documentation of the typical targets used
1128# ---------------------------------------------------------------------------
1129
1130boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1131boards := $(notdir $(boards))
1132
1133help:
1134 @echo 'Cleaning targets:'
Samuel Tardieu5ea084e2006-12-12 19:09:40 +01001135 @echo ' clean - Remove most generated files but keep the config and'
Jesper Juhl5cc8d242006-09-24 14:01:08 +02001136 @echo ' enough build support to build external modules'
Samuel Tardieu5ea084e2006-12-12 19:09:40 +01001137 @echo ' mrproper - Remove all generated files + config + various backup files'
Jesper Juhl5cc8d242006-09-24 14:01:08 +02001138 @echo ' distclean - mrproper + remove editor backup and patch files'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139 @echo ''
1140 @echo 'Configuration targets:'
1141 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1142 @echo ''
1143 @echo 'Other generic targets:'
1144 @echo ' all - Build all targets marked with [*]'
1145 @echo '* vmlinux - Build the bare kernel'
1146 @echo '* modules - Build all modules'
Bodo Eggert9cc5d742005-11-23 20:11:34 +01001147 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148 @echo ' dir/ - Build all files in dir and below'
1149 @echo ' dir/file.[ois] - Build specified target only'
Sam Ravnborg155ad602005-07-07 17:56:08 -07001150 @echo ' dir/file.ko - Build module including final link'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151 @echo ' rpm - Build a kernel as an RPM package'
1152 @echo ' tags/TAGS - Generate tags file for editors'
1153 @echo ' cscope - Generate cscope index'
Zach Brown6d128842005-09-07 12:08:23 -07001154 @echo ' kernelrelease - Output the release version string'
Sam Ravnborgcb584552006-01-09 21:20:34 +01001155 @echo ' kernelversion - Output the version stored in Makefile'
Thomas Gleixner91e034e2007-10-11 17:53:52 +02001156 @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
David Woodhousef17b7ba2006-09-21 09:01:45 +01001157 echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
Geert Uytterhoeven59df3232007-01-29 13:47:01 +01001158 echo ' (default: $(INSTALL_HDR_PATH))'; \
David Woodhousef17b7ba2006-09-21 09:01:45 +01001159 fi
Linus Torvalds1da177e2005-04-16 15:20:36 -07001160 @echo ''
1161 @echo 'Static analysers'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162 @echo ' checkstack - Generate a list of stack hogs'
1163 @echo ' namespacecheck - Name space analysis on compiled kernel'
Adrian Bunk295ac052007-08-24 23:04:56 +02001164 @echo ' export_report - List the usages of all exported symbols'
Thomas Gleixner91e034e2007-10-11 17:53:52 +02001165 @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
David Woodhousef17b7ba2006-09-21 09:01:45 +01001166 echo ' headers_check - Sanity check on exported headers'; \
1167 fi
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168 @echo ''
1169 @echo 'Kernel packaging:'
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001170 @$(MAKE) $(build)=$(package-dir) help
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171 @echo ''
1172 @echo 'Documentation targets:'
1173 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1174 @echo ''
1175 @echo 'Architecture specific targets ($(ARCH)):'
1176 @$(if $(archhelp),$(archhelp),\
1177 echo ' No architecture specific help defined for $(ARCH)')
1178 @echo ''
1179 @$(if $(boards), \
1180 $(foreach b, $(boards), \
1181 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1182 echo '')
1183
1184 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
Sam Ravnborg45d506b2006-08-08 21:35:14 +02001185 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
Dustin Kirkland701842e2006-05-23 15:57:23 -05001187 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1188 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001189 @echo ''
1190 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1191 @echo 'For further info see the ./README file'
1192
1193
1194# Documentation targets
1195# ---------------------------------------------------------------------------
1196%docs: scripts_basic FORCE
1197 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1198
1199else # KBUILD_EXTMOD
1200
1201###
1202# External module support.
1203# When building external modules the kernel used as basis is considered
1204# read-only, and no consistency checks are made and the make
1205# system is not used on the basis kernel. If updates are required
1206# in the basis kernel ordinary make commands (without M=...) must
1207# be used.
1208#
1209# The following are the only valid targets when building external
1210# modules.
1211# make M=dir clean Delete all automatically generated files
1212# make M=dir modules Make all modules in specified dir
1213# make M=dir Same as 'make M=dir modules'
1214# make M=dir modules_install
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001215# Install the modules built in the module directory
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216# Assumes install directory is already created
1217
1218# We are always building modules
1219KBUILD_MODULES := 1
Paul Smith4f193362006-03-05 17:14:10 -05001220PHONY += crmodverdir
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221crmodverdir:
1222 $(Q)mkdir -p $(MODVERDIR)
Pavel Roskinfca1dff2006-04-24 15:55:27 -04001223 $(Q)rm -f $(MODVERDIR)/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224
Paul Smith4f193362006-03-05 17:14:10 -05001225PHONY += $(objtree)/Module.symvers
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226$(objtree)/Module.symvers:
1227 @test -e $(objtree)/Module.symvers || ( \
1228 echo; \
1229 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1230 echo " is missing; modules will have no dependencies and modversions."; \
1231 echo )
1232
1233module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
Paul Smith4f193362006-03-05 17:14:10 -05001234PHONY += $(module-dirs) modules
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235$(module-dirs): crmodverdir $(objtree)/Module.symvers
1236 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1237
1238modules: $(module-dirs)
1239 @echo ' Building modules, stage 2.';
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001240 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241
Paul Smith4f193362006-03-05 17:14:10 -05001242PHONY += modules_install
Sam Ravnborga67dc212006-01-28 23:51:57 +01001243modules_install: _emodinst_ _emodinst_post
Adrian Bunke6304662006-02-14 15:58:15 +01001244
Paul Smith4f193362006-03-05 17:14:10 -05001245install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1246PHONY += _emodinst_
Sam Ravnborga67dc212006-01-28 23:51:57 +01001247_emodinst_:
Sam Ravnborga67dc212006-01-28 23:51:57 +01001248 $(Q)mkdir -p $(MODLIB)/$(install-dir)
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001249 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250
Sam Ravnborga67dc212006-01-28 23:51:57 +01001251# Run depmod only is we have System.map and depmod is executable
1252quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1253 cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \
1254 $(DEPMOD) -ae -F System.map \
1255 $(if $(strip $(INSTALL_MOD_PATH)), \
1256 -b $(INSTALL_MOD_PATH) -r) \
1257 $(KERNELRELEASE); \
1258 fi
1259
Paul Smith4f193362006-03-05 17:14:10 -05001260PHONY += _emodinst_post
Sam Ravnborga67dc212006-01-28 23:51:57 +01001261_emodinst_post: _emodinst_
1262 $(call cmd,depmod)
1263
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1265
Paul Smith4f193362006-03-05 17:14:10 -05001266PHONY += $(clean-dirs) clean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267$(clean-dirs):
1268 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1269
1270clean: rm-dirs := $(MODVERDIR)
Mike Frysingerc34114f2007-07-31 19:45:34 -04001271clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272clean: $(clean-dirs)
1273 $(call cmd,rmdirs)
Mike Frysingerc34114f2007-07-31 19:45:34 -04001274 $(call cmd,rmfiles)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001276 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1278 -type f -print | xargs rm -f
1279
1280help:
1281 @echo ' Building external modules.'
1282 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1283 @echo ''
1284 @echo ' modules - default target, build the module(s)'
1285 @echo ' modules_install - install the module'
1286 @echo ' clean - remove generated files in module directory only'
1287 @echo ''
Sam Ravnborg06300b22006-01-25 07:13:18 +01001288
1289# Dummies...
Paul Smith4f193362006-03-05 17:14:10 -05001290PHONY += prepare scripts
Sam Ravnborg06300b22006-01-25 07:13:18 +01001291prepare: ;
1292scripts: ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001293endif # KBUILD_EXTMOD
1294
1295# Generate tags for editors
1296# ---------------------------------------------------------------------------
1297
1298#We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1299#(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1300#Adding $(srctree) adds about 20M on i386 to the size of the output file!
1301
George Anzingerf182ae62005-07-07 17:56:06 -07001302ifeq ($(src),$(obj))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303__srctree =
1304else
1305__srctree = $(srctree)/
1306endif
1307
Paolo 'Blaisorblade' Giarrusso2ab23c92005-11-13 16:07:00 -08001308ifeq ($(ALLSOURCE_ARCHS),)
1309ifeq ($(ARCH),um)
1310ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1311else
Thomas Gleixner2eb4c952007-10-11 11:11:38 +02001312ALLINCLUDE_ARCHS := $(SRCARCH)
Paolo 'Blaisorblade' Giarrusso2ab23c92005-11-13 16:07:00 -08001313endif
1314else
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001315#Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behavour.
Paolo 'Blaisorblade' Giarrusso2ab23c92005-11-13 16:07:00 -08001316ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1317endif
1318
Thomas Gleixner2eb4c952007-10-11 11:11:38 +02001319# Take care of arch/x86
1320ifeq ($(ARCH), $(SRCARCH))
Ian Campbella0674e82005-06-23 11:25:54 +01001321ALLSOURCE_ARCHS := $(ARCH)
Thomas Gleixner2eb4c952007-10-11 11:11:38 +02001322else
1323ALLSOURCE_ARCHS := $(ARCH) $(SRCARCH)
1324endif
Ian Campbella0674e82005-06-23 11:25:54 +01001325
Masatake YAMATOe838db62006-06-22 12:21:20 +09001326define find-sources
Don Mullisdd7e54a2007-01-04 10:14:52 -08001327 ( for ARCH in $(ALLSOURCE_ARCHS) ; do \
Thomas Gleixner2eb4c952007-10-11 11:11:38 +02001328 find $(__srctree)arch/$${SRCARCH} $(RCS_FIND_IGNORE) \
Masatake YAMATOe838db62006-06-22 12:21:20 +09001329 -name $1 -print; \
Ian Campbella0674e82005-06-23 11:25:54 +01001330 done ; \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331 find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
Masatake YAMATOe838db62006-06-22 12:21:20 +09001332 -name $1 -print; \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333 find $(__srctree)include $(RCS_FIND_IGNORE) \
1334 \( -name config -o -name 'asm-*' \) -prune \
Masatake YAMATOe838db62006-06-22 12:21:20 +09001335 -o -name $1 -print; \
Paolo 'Blaisorblade' Giarrusso2ab23c92005-11-13 16:07:00 -08001336 for ARCH in $(ALLINCLUDE_ARCHS) ; do \
Thomas Gleixner2eb4c952007-10-11 11:11:38 +02001337 find $(__srctree)include/asm-$${SRCARCH} $(RCS_FIND_IGNORE) \
Masatake YAMATOe838db62006-06-22 12:21:20 +09001338 -name $1 -print; \
Ian Campbella0674e82005-06-23 11:25:54 +01001339 done ; \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340 find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
Don Mullisdd7e54a2007-01-04 10:14:52 -08001341 -name $1 -print; \
1342 find $(__srctree) $(RCS_FIND_IGNORE) \
1343 \( -name include -o -name arch \) -prune -o \
1344 -name $1 -print; \
1345 )
Masatake YAMATOe838db62006-06-22 12:21:20 +09001346endef
1347
1348define all-sources
1349 $(call find-sources,'*.[chS]')
1350endef
1351define all-kconfigs
1352 $(call find-sources,'Kconfig*')
1353endef
1354define all-defconfigs
1355 $(call find-sources,'defconfig')
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356endef
1357
Aron Griffisda7c0402006-09-21 00:27:02 -04001358define xtags
1359 if $1 --version 2>&1 | grep -iq exuberant; then \
1360 $(all-sources) | xargs $1 -a \
1361 -I __initdata,__exitdata,__acquires,__releases \
1362 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
Aneesh Kumar K.V91b943e2006-10-17 00:10:32 -07001363 --extra=+f --c-kinds=+px \
Aneesh Kumar K.Va412c172007-07-09 11:43:57 -07001364 --regex-asm='/^ENTRY\(([^)]*)\).*/\1/'; \
Aron Griffisda7c0402006-09-21 00:27:02 -04001365 $(all-kconfigs) | xargs $1 -a \
1366 --langdef=kconfig \
1367 --language-force=kconfig \
1368 --regex-kconfig='/^[[:blank:]]*config[[:blank:]]+([[:alnum:]_]+)/\1/'; \
David Gibson18e39912006-10-04 02:15:32 -07001369 $(all-defconfigs) | xargs -r $1 -a \
Aron Griffisda7c0402006-09-21 00:27:02 -04001370 --langdef=dotconfig \
1371 --language-force=dotconfig \
1372 --regex-dotconfig='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'; \
1373 elif $1 --version 2>&1 | grep -iq emacs; then \
1374 $(all-sources) | xargs $1 -a; \
1375 $(all-kconfigs) | xargs $1 -a \
1376 --regex='/^[ \t]*config[ \t]+\([a-zA-Z0-9_]+\)/\1/'; \
David Gibson18e39912006-10-04 02:15:32 -07001377 $(all-defconfigs) | xargs -r $1 -a \
Aron Griffisda7c0402006-09-21 00:27:02 -04001378 --regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'; \
1379 else \
1380 $(all-sources) | xargs $1 -a; \
1381 fi
1382endef
1383
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384quiet_cmd_cscope-file = FILELST cscope.files
Karl Hegbloomacbef452005-06-19 00:50:47 -07001385 cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386
1387quiet_cmd_cscope = MAKE cscope.out
Karl Hegbloomacbef452005-06-19 00:50:47 -07001388 cmd_cscope = cscope -b
Linus Torvalds1da177e2005-04-16 15:20:36 -07001389
1390cscope: FORCE
1391 $(call cmd,cscope-file)
1392 $(call cmd,cscope)
1393
1394quiet_cmd_TAGS = MAKE $@
Sam Ravnborg66d609e2005-07-28 23:11:34 +02001395define cmd_TAGS
1396 rm -f $@; \
Aron Griffisda7c0402006-09-21 00:27:02 -04001397 $(call xtags,etags)
Sam Ravnborg66d609e2005-07-28 23:11:34 +02001398endef
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399
Sam Ravnborg66d609e2005-07-28 23:11:34 +02001400TAGS: FORCE
1401 $(call cmd,TAGS)
1402
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403quiet_cmd_tags = MAKE $@
1404define cmd_tags
1405 rm -f $@; \
Aron Griffisda7c0402006-09-21 00:27:02 -04001406 $(call xtags,ctags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407endef
1408
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409tags: FORCE
1410 $(call cmd,tags)
1411
1412
1413# Scripts to check various things for consistency
1414# ---------------------------------------------------------------------------
1415
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416includecheck:
1417 find * $(RCS_FIND_IGNORE) \
1418 -name '*.[hcS]' -type f -print | sort \
1419 | xargs $(PERL) -w scripts/checkincludes.pl
1420
1421versioncheck:
1422 find * $(RCS_FIND_IGNORE) \
1423 -name '*.[hcS]' -type f -print | sort \
1424 | xargs $(PERL) -w scripts/checkversion.pl
1425
Linus Torvalds1da177e2005-04-16 15:20:36 -07001426namespacecheck:
1427 $(PERL) $(srctree)/scripts/namespace.pl
1428
Adrian Bunk295ac052007-08-24 23:04:56 +02001429export_report:
1430 $(PERL) $(srctree)/scripts/export_report.pl
1431
Linus Torvalds1da177e2005-04-16 15:20:36 -07001432endif #ifeq ($(config-targets),1)
1433endif #ifeq ($(mixed-targets),1)
1434
Roman Zippelc30a02e2006-06-08 22:12:50 -07001435PHONY += checkstack kernelrelease kernelversion
Jeff Dikee3ccf6e2006-09-27 01:50:37 -07001436
Jeff Dike011e3a92006-12-13 00:34:12 -08001437# UML needs a little special treatment here. It wants to use the host
1438# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1439# else wants $(ARCH), including people doing cross-builds, which means
1440# that $(SUBARCH) doesn't work here.
1441ifeq ($(ARCH), um)
1442CHECKSTACK_ARCH := $(SUBARCH)
1443else
1444CHECKSTACK_ARCH := $(ARCH)
1445endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001446checkstack:
1447 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
Jeff Dike011e3a92006-12-13 00:34:12 -08001448 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001449
1450kernelrelease:
Roman Zippelf1d28fb2006-06-08 22:12:43 -07001451 $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1452 $(error kernelrelease not valid - run 'make prepare' to update it))
Sam Ravnborgcb584552006-01-09 21:20:34 +01001453kernelversion:
Sam Ravnborg2244cbd2006-01-16 12:12:12 +01001454 @echo $(KERNELVERSION)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455
Sam Ravnborg06300b22006-01-25 07:13:18 +01001456# Single targets
1457# ---------------------------------------------------------------------------
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001458# Single targets are compatible with:
1459# - build whith mixed source and output
1460# - build with separate output dir 'make O=...'
1461# - external modules
1462#
1463# target-dir => where to store outputfile
1464# build-dir => directory in kernel source tree to use
Sam Ravnborg06300b22006-01-25 07:13:18 +01001465
Sam Ravnborg06300b22006-01-25 07:13:18 +01001466ifeq ($(KBUILD_EXTMOD),)
Sam Ravnborgaa360872006-04-06 08:25:31 +02001467 build-dir = $(patsubst %/,%,$(dir $@))
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001468 target-dir = $(dir $@)
Sam Ravnborg06300b22006-01-25 07:13:18 +01001469else
1470 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001471 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1472 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
Sam Ravnborg06300b22006-01-25 07:13:18 +01001473endif
1474
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001475%.s: %.c prepare scripts FORCE
1476 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1477%.i: %.c prepare scripts FORCE
1478 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1479%.o: %.c prepare scripts FORCE
1480 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1481%.lst: %.c prepare scripts FORCE
1482 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1483%.s: %.S prepare scripts FORCE
1484 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1485%.o: %.S prepare scripts FORCE
1486 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
Andreas Gruenbacher15fde672006-05-09 20:37:30 +02001487%.symtypes: %.c prepare scripts FORCE
1488 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001489
1490# Modules
1491/ %/: prepare scripts FORCE
Sam Ravnborg06300b22006-01-25 07:13:18 +01001492 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001493 $(build)=$(build-dir)
1494%.ko: prepare scripts FORCE
Sam Ravnborg06300b22006-01-25 07:13:18 +01001495 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001496 $(build)=$(build-dir) $(@:.ko=.o)
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001497 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
Sam Ravnborg06300b22006-01-25 07:13:18 +01001498
Linus Torvalds1da177e2005-04-16 15:20:36 -07001499# FIXME Should go into a make.lib or something
1500# ===========================================================================
1501
1502quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1503 cmd_rmdirs = rm -rf $(rm-dirs)
1504
1505quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1506 cmd_rmfiles = rm -f $(rm-files)
1507
1508
Sam Ravnborg222d3942007-10-15 21:59:31 +02001509a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001510 $(NOSTDINC_FLAGS) $(CPPFLAGS) \
Sam Ravnborg5e8d7802006-07-01 09:58:02 +02001511 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001512
1513quiet_cmd_as_o_S = AS $@
1514cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1515
1516# read all saved command lines
1517
1518targets := $(wildcard $(sort $(targets)))
1519cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1520
1521ifneq ($(cmd_files),)
1522 $(cmd_files): ; # Do not try to update included dependency files
1523 include $(cmd_files)
1524endif
1525
Linus Torvalds1da177e2005-04-16 15:20:36 -07001526# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1527# Usage:
1528# $(Q)$(MAKE) $(clean)=dir
1529clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1530
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531endif # skip-makefile
1532
Paul Smith4f193362006-03-05 17:14:10 -05001533PHONY += FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001534FORCE:
Paul Smith4f193362006-03-05 17:14:10 -05001535
Oleg Verych15964862006-12-10 02:18:40 -08001536# Cancel implicit rules on top Makefile, `-rR' will apply to sub-makes.
1537Makefile: ;
Paul Smith4f193362006-03-05 17:14:10 -05001538
1539# Declare the contents of the .PHONY variable as phony. We keep that
1540# information in a variable se we can use it in if_changed and friends.
1541.PHONY: $(PHONY)