blob: 188c3b6b3fa9ac33fbe9fba2417365eae23585d6 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001VERSION = 2
2PATCHLEVEL = 6
Linus Torvaldsc9927c22007-10-23 20:50:57 -07003SUBLEVEL = 24
4EXTRAVERSION = -rc1
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/ \
Paul Mundt236b1952007-11-02 12:22:47 +0900171 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
172 -e s/sh[234].*/sh/ )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
174# Cross compiling and selecting different set of gcc/bin-utils
175# ---------------------------------------------------------------------------
176#
177# When performing cross compilation for other architectures ARCH shall be set
178# to the target architecture. (See arch/* for the possibilities).
179# ARCH can be set during invocation of make:
180# make ARCH=ia64
181# Another way is to have ARCH set in the environment.
182# The default ARCH is the host where make is executed.
183
184# CROSS_COMPILE specify the prefix used for all executables used
185# during compilation. Only gcc and related bin-utils executables
186# are prefixed with $(CROSS_COMPILE).
187# CROSS_COMPILE can be set on the command line
188# make CROSS_COMPILE=ia64-linux-
189# Alternatively CROSS_COMPILE can be set in the environment.
190# Default value for CROSS_COMPILE is not to prefix executables
191# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
192
193ARCH ?= $(SUBARCH)
194CROSS_COMPILE ?=
195
196# Architecture as present in compile.h
Thomas Gleixner6752ed92007-10-11 11:11:36 +0200197UTS_MACHINE := $(ARCH)
198SRCARCH := $(ARCH)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199
Sam Ravnborg74b469f2007-10-25 19:42:04 +0200200# for i386 and x86_64 we use SRCARCH equal to x86
201SRCARCH := $(if $(filter x86_64 i386,$(SRCARCH)),x86,$(SRCARCH))
202
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700203KCONFIG_CONFIG ?= .config
204
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205# SHELL used by kbuild
206CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
207 else if [ -x /bin/bash ]; then echo /bin/bash; \
208 else echo sh; fi ; fi)
209
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200210HOSTCC = gcc
211HOSTCXX = g++
212HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
213HOSTCXXFLAGS = -O2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200215# Decide whether to build built-in, modular, or both.
216# Normally, just do built-in.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
218KBUILD_MODULES :=
219KBUILD_BUILTIN := 1
220
221# If we have only "make modules", don't compile built-in objects.
222# When we're building modules with modversions, we need to consider
223# the built-in objects during the descend as well, in order to
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200224# make sure the checksums are up to date before we record them.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
226ifeq ($(MAKECMDGOALS),modules)
227 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
228endif
229
230# If we have "make <whatever> modules", compile modules
231# in addition to whatever we do anyway.
232# Just "make" or "make all" shall build modules as well
233
234ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
235 KBUILD_MODULES := 1
236endif
237
238ifeq ($(MAKECMDGOALS),)
239 KBUILD_MODULES := 1
240endif
241
Sam Ravnborge579d352005-07-27 08:10:10 +0200242export KBUILD_MODULES KBUILD_BUILTIN
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
244
245# Beautify output
246# ---------------------------------------------------------------------------
247#
248# Normally, we echo the whole command before executing it. By making
249# that echo $($(quiet)$(cmd)), we now have the possibility to set
250# $(quiet) to choose other forms of output instead, e.g.
251#
252# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
253# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
254#
255# If $(quiet) is empty, the whole command will be printed.
256# If it is set to "quiet_", only the short version will be printed.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200257# If it is set to "silent_", nothing will be printed at all, since
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258# the variable $(silent_cmd_cc_o_c) doesn't exist.
259#
Adrian Bunka58a4142006-01-10 00:08:17 +0100260# A simple variant is to prefix commands with $(Q) - that's useful
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261# for commands that shall be hidden in non-verbose mode.
262#
263# $(Q)ln $@ :<
264#
265# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
266# If KBUILD_VERBOSE equals 1 then the above command is displayed.
267
268ifeq ($(KBUILD_VERBOSE),1)
269 quiet =
270 Q =
271else
272 quiet=quiet_
273 Q = @
274endif
275
276# If the user is running make -s (silent mode), suppress echoing of
277# commands
278
279ifneq ($(findstring s,$(MAKEFLAGS)),)
280 quiet=silent_
281endif
282
283export quiet Q KBUILD_VERBOSE
284
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285
286# Look for make include files relative to root of kernel src
287MAKEFLAGS += --include-dir=$(srctree)
288
Oleg Verych15964862006-12-10 02:18:40 -0800289# We need some generic definitions.
290include $(srctree)/scripts/Kbuild.include
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291
292# Make variables (CC, etc...)
293
294AS = $(CROSS_COMPILE)as
295LD = $(CROSS_COMPILE)ld
296CC = $(CROSS_COMPILE)gcc
297CPP = $(CC) -E
298AR = $(CROSS_COMPILE)ar
299NM = $(CROSS_COMPILE)nm
300STRIP = $(CROSS_COMPILE)strip
301OBJCOPY = $(CROSS_COMPILE)objcopy
302OBJDUMP = $(CROSS_COMPILE)objdump
303AWK = awk
304GENKSYMS = scripts/genksyms/genksyms
305DEPMOD = /sbin/depmod
306KALLSYMS = scripts/kallsyms
307PERL = perl
308CHECK = sparse
309
Al Viroaf4ca452005-10-21 02:55:38 -0400310CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311MODFLAGS = -DMODULE
312CFLAGS_MODULE = $(MODFLAGS)
313AFLAGS_MODULE = $(MODFLAGS)
Roland McGrath114f5152007-07-23 01:12:08 -0700314LDFLAGS_MODULE =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315CFLAGS_KERNEL =
316AFLAGS_KERNEL =
317
318
319# Use LINUXINCLUDE when you must reference the include/ directory.
320# Needed to be compatible with the O= option
321LINUXINCLUDE := -Iinclude \
Russell King2dd34b42005-10-30 22:42:11 +0100322 $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
Zachary Amsdene623a3b2005-11-07 15:27:51 -0800323 -include include/linux/autoconf.h
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324
Sam Ravnborg06c50402007-10-15 22:17:25 +0200325KBUILD_CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200327KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
Dave Jones94bed2a2007-07-15 23:41:38 -0700328 -fno-strict-aliasing -fno-common \
329 -Werror-implicit-function-declaration
Sam Ravnborg222d3942007-10-15 21:59:31 +0200330KBUILD_AFLAGS := -D__ASSEMBLY__
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700332# Read KERNELRELEASE from include/config/kernel.release (if it exists)
333KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
Sam Ravnborg2244cbd2006-01-16 12:12:12 +0100334KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
Sam Ravnborgcb584552006-01-09 21:20:34 +0100335
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200336export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
Thomas Gleixner6752ed92007-10-11 11:11:36 +0200337export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200338export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
339export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340
Sam Ravnborg06c50402007-10-15 22:17:25 +0200341export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200342export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
Sam Ravnborg222d3942007-10-15 21:59:31 +0200343export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344
345# When compiling out-of-tree modules, put MODVERDIR in the module
346# tree rather than in the kernel tree. The kernel tree might
347# even be read-only.
348export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
349
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350# Files to ignore in find ... statements
351
Trond Myklebust406119f2005-10-27 14:46:53 -0400352RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
353export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354
355# ===========================================================================
356# Rules shared between *config targets and build targets
357
358# Basic helpers built in scripts/
Paul Smith4f193362006-03-05 17:14:10 -0500359PHONY += scripts_basic
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360scripts_basic:
361 $(Q)$(MAKE) $(build)=scripts/basic
362
Jan Beulichcd05e6b2005-09-06 11:47:04 +0200363# To avoid any implicit rule to kick in, define an empty command.
364scripts/basic/%: scripts_basic ;
365
Paul Smith4f193362006-03-05 17:14:10 -0500366PHONY += outputmakefile
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200367# outputmakefile generates a Makefile in the output directory, if using a
368# separate output directory. This allows convenient use of make in the
369# output directory.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370outputmakefile:
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200371ifneq ($(KBUILD_SRC),)
372 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
373 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
374endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375
376# To make sure we do not include .config for any of the *config targets
377# catch them early, and hand them over to scripts/kconfig/Makefile
378# It is allowed to specify more targets when calling make, including
379# mixing *config targets and build targets.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200380# For example 'make oldconfig all'.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381# Detect when mixed targets is specified, and make a second invocation
382# of make so .config is not included in this case either (for *config).
383
Roman Zippel3eb3c742007-01-10 14:45:28 +0100384no-dot-config-targets := clean mrproper distclean \
Roman Zippelc30a02e2006-06-08 22:12:50 -0700385 cscope TAGS tags help %docs check% \
Roman Zippel3eb3c742007-01-10 14:45:28 +0100386 include/linux/version.h headers_% \
387 kernelrelease kernelversion
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388
389config-targets := 0
390mixed-targets := 0
391dot-config := 1
392
393ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
394 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
395 dot-config := 0
396 endif
397endif
398
399ifeq ($(KBUILD_EXTMOD),)
400 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
401 config-targets := 1
402 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
403 mixed-targets := 1
404 endif
405 endif
406endif
407
408ifeq ($(mixed-targets),1)
409# ===========================================================================
410# We're called with mixed targets (*config and build targets).
411# Handle them one by one.
412
413%:: FORCE
414 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
415
416else
417ifeq ($(config-targets),1)
418# ===========================================================================
419# *config targets only - make sure prerequisites are updated, and descend
420# in scripts/kconfig to make the *config target
421
422# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
423# KBUILD_DEFCONFIG may point out an alternative default configuration
424# used for 'make defconfig'
Sam Ravnborg74b469f2007-10-25 19:42:04 +0200425include $(srctree)/arch/$(SRCARCH)/Makefile
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426export KBUILD_DEFCONFIG
427
Jan Beulichcd05e6b2005-09-06 11:47:04 +0200428config %config: scripts_basic outputmakefile FORCE
Roman Zippelc955cca2006-06-08 22:12:39 -0700429 $(Q)mkdir -p include/linux include/config
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 $(Q)$(MAKE) $(build)=scripts/kconfig $@
431
432else
433# ===========================================================================
434# Build targets only - this includes vmlinux, arch specific targets, clean
435# targets and others. In general all targets except *config targets.
436
437ifeq ($(KBUILD_EXTMOD),)
438# Additional helpers built in scripts/
439# Carefully list dependencies so we do not try to build scripts twice
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200440# in parallel
Paul Smith4f193362006-03-05 17:14:10 -0500441PHONY += scripts
Roman Zippel2e3646e2006-06-08 22:12:42 -0700442scripts: scripts_basic include/config/auto.conf
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 $(Q)$(MAKE) $(build)=$(@)
444
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445# Objects we will link into vmlinux / subdirs we need to visit
446init-y := init/
447drivers-y := drivers/ sound/
448net-y := net/
449libs-y := lib/
450core-y := usr/
451endif # KBUILD_EXTMOD
452
453ifeq ($(dot-config),1)
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200454# Read in config
455-include include/config/auto.conf
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200457ifeq ($(KBUILD_EXTMOD),)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458# Read in dependencies to all Kconfig* files, make sure to run
459# oldconfig if changes are detected.
Roman Zippelc955cca2006-06-08 22:12:39 -0700460-include include/config/auto.conf.cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462# To avoid any implicit rule to kick in, define an empty command
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700463$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464
Roman Zippelc955cca2006-06-08 22:12:39 -0700465# If .config is newer than include/config/auto.conf, someone tinkered
Sam Ravnborg752625c2005-12-26 23:34:03 +0100466# with it and forgot to run make oldconfig.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200467# if auto.conf.cmd is missing then we are probably in a cleaned tree so
Sam Ravnborg752625c2005-12-26 23:34:03 +0100468# we execute the config step to be sure to catch updated Kconfig files
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700469include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
471else
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200472# external modules needs include/linux/autoconf.h and include/config/auto.conf
473# but do not care if they are up-to-date. Use auto.conf to trigger the test
474PHONY += include/config/auto.conf
475
476include/config/auto.conf:
477 $(Q)test -e include/linux/autoconf.h -a -e $@ || ( \
478 echo; \
479 echo " ERROR: Kernel configuration is invalid."; \
480 echo " include/linux/autoconf.h or $@ are missing."; \
481 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
482 echo; \
483 /bin/false)
484
485endif # KBUILD_EXTMOD
Roman Zippelc955cca2006-06-08 22:12:39 -0700486
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487else
488# Dummy target needed, because used as prerequisite
Roman Zippelc955cca2006-06-08 22:12:39 -0700489include/config/auto.conf: ;
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200490endif # $(dot-config)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491
492# The all: target is the default when no target is given on the
493# command line.
494# This allow a user to issue only 'make' to build a kernel including modules
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200495# Defaults vmlinux but it is usually overridden in the arch makefile
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496all: vmlinux
497
498ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200499KBUILD_CFLAGS += -Os
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500else
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200501KBUILD_CFLAGS += -O2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502endif
503
Sam Ravnborg74b469f2007-10-25 19:42:04 +0200504include $(srctree)/arch/$(SRCARCH)/Makefile
Sam Ravnborgc9eca0b2006-08-16 21:14:08 +0200505
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506ifdef CONFIG_FRAME_POINTER
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200507KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508else
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200509KBUILD_CFLAGS += -fomit-frame-pointer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510endif
511
512ifdef CONFIG_DEBUG_INFO
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200513KBUILD_CFLAGS += -g
Sam Ravnborg222d3942007-10-15 21:59:31 +0200514KBUILD_AFLAGS += -gdwarf-2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515endif
516
Sam Ravnborgc9eca0b2006-08-16 21:14:08 +0200517# Force gcc to behave correct even for buggy distributions
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200518KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519
Sam Ravnborge8e69932005-04-30 16:51:42 -0700520# arch Makefile may override CC so keep this after arch Makefile is included
Rik van Riele8f5bdb2005-05-16 21:53:46 -0700521NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
Sam Ravnborge8e69932005-04-30 16:51:42 -0700522CHECKFLAGS += $(NOSTDINC_FLAGS)
523
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524# warn about C99 declaration after statement
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200525KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200527# disable pointer signed / unsigned warnings in gcc 4.0
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200528KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529
Sam Ravnborg06c50402007-10-15 22:17:25 +0200530# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
531KBUILD_CPPFLAGS += $(CPPFLAGS)
532KBUILD_AFLAGS += $(AFLAGS)
533KBUILD_CFLAGS += $(CFLAGS)
Sam Ravnborg52bcc332007-10-15 22:03:58 +0200534
Roland McGrath18991192007-07-19 01:48:40 -0700535# Use --build-id when available.
536LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
537 $(call ld-option, -Wl$(comma)--build-id,))
538LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
539LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
540
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541# Default kernel image to build when no specific target is given.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200542# KBUILD_IMAGE may be overruled on the command line or
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543# set in the environment
544# Also any assignments in arch/$(ARCH)/Makefile take precedence over
545# this default value
546export KBUILD_IMAGE ?= vmlinux
547
548#
549# INSTALL_PATH specifies where to place the updated kernel and system map
550# images. Default is /boot, but you can set it to other values
551export INSTALL_PATH ?= /boot
552
553#
554# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
555# relocations required by build roots. This is not defined in the
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200556# makefile but the argument can be passed to make if needed.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557#
558
Sam Ravnborgdf9df032006-01-16 12:46:07 +0100559MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560export MODLIB
561
Theodore Ts'oac031f22006-06-21 20:53:09 -0400562#
563# INSTALL_MOD_STRIP, if defined, will cause modules to be
564# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
565# the default option --strip-debug will be used. Otherwise,
566# INSTALL_MOD_STRIP will used as the options to the strip command.
567
568ifdef INSTALL_MOD_STRIP
569ifeq ($(INSTALL_MOD_STRIP),1)
Andreas Schwabe3402212006-07-05 18:57:48 +0200570mod_strip_cmd = $(STRIP) --strip-debug
Theodore Ts'oac031f22006-06-21 20:53:09 -0400571else
572mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
573endif # INSTALL_MOD_STRIP=1
574else
575mod_strip_cmd = true
576endif # INSTALL_MOD_STRIP
577export mod_strip_cmd
578
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579
580ifeq ($(KBUILD_EXTMOD),)
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100581core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582
583vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
584 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
585 $(net-y) $(net-m) $(libs-y) $(libs-m)))
586
587vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
588 $(init-n) $(init-) \
589 $(core-n) $(core-) $(drivers-n) $(drivers-) \
590 $(net-n) $(net-) $(libs-n) $(libs-))))
591
592init-y := $(patsubst %/, %/built-in.o, $(init-y))
593core-y := $(patsubst %/, %/built-in.o, $(core-y))
594drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
595net-y := $(patsubst %/, %/built-in.o, $(net-y))
596libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
597libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
598libs-y := $(libs-y1) $(libs-y2)
599
600# Build vmlinux
601# ---------------------------------------------------------------------------
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200602# vmlinux is built from the objects selected by $(vmlinux-init) and
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603# $(vmlinux-main). Most are built-in.o files from top-level directories
Uwe Zeisberger24625662006-10-05 16:24:45 +0200604# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605# Ordering when linking is important, and $(vmlinux-init) must be first.
606#
607# vmlinux
608# ^
609# |
610# +-< $(vmlinux-init)
611# | +--< init/version.o + more
612# |
613# +--< $(vmlinux-main)
614# | +--< driver/built-in.o mm/built-in.o + more
615# |
616# +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
617#
618# vmlinux version (uname -v) cannot be updated during normal
619# descending-into-subdirs phase since we do not yet know if we need to
620# update vmlinux.
621# Therefore this step is delayed until just before final link of vmlinux -
622# except in the kallsyms case where it is done just before adding the
623# symbols to the kernel.
624#
625# System.map is generated to document addresses of all kernel symbols
626
627vmlinux-init := $(head-y) $(init-y)
628vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
629vmlinux-all := $(vmlinux-init) $(vmlinux-main)
Thomas Gleixner6752ed92007-10-11 11:11:36 +0200630vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
Sam Ravnborg85bd2fd2007-02-26 15:33:52 +0100631export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632
633# Rule to link vmlinux - also used during CONFIG_KALLSYMS
634# May be overridden by arch/$(ARCH)/Makefile
635quiet_cmd_vmlinux__ ?= LD $@
636 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
637 -T $(vmlinux-lds) $(vmlinux-init) \
638 --start-group $(vmlinux-main) --end-group \
Sam Ravnborg741f98f2007-07-17 10:54:06 +0200639 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640
641# Generate new vmlinux version
642quiet_cmd_vmlinux_version = GEN .version
643 cmd_vmlinux_version = set -e; \
Jan Beulich4e25d8b2005-09-08 17:07:35 +0200644 if [ ! -r .version ]; then \
645 rm -f .version; \
646 echo 1 >.version; \
647 else \
648 mv .version .old_version; \
649 expr 0$$(cat .old_version) + 1 >.version; \
650 fi; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 $(MAKE) $(build)=init
652
653# Generate System.map
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200654quiet_cmd_sysmap = SYSMAP
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
656
657# Link of vmlinux
658# If CONFIG_KALLSYMS is set .version is already updated
659# Generate System.map and verify that the content is consistent
Mark Rustad39ca3712005-10-17 16:43:34 -0700660# Use + in front of the vmlinux_version rule to silent warning with make -j2
661# First command is ':' to allow us to use + in front of the rule
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662define rule_vmlinux__
Mark Rustad39ca3712005-10-17 16:43:34 -0700663 :
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
665
666 $(call cmd,vmlinux__)
667 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
668
Sam Ravnborg46352812006-08-08 21:41:18 +0200669 $(Q)$(if $($(quiet)cmd_sysmap), \
670 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
671 $(cmd_sysmap) $@ System.map; \
672 if [ $$? -ne 0 ]; then \
673 rm -f $@; \
674 /bin/false; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 fi;
676 $(verify_kallsyms)
677endef
678
679
680ifdef CONFIG_KALLSYMS
681# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
682# It's a three stage process:
683# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
684# empty
685# Running kallsyms on that gives us .tmp_kallsyms1.o with
686# the right size - vmlinux version (uname -v) is updated during this step
687# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
688# but due to the added section, some addresses have shifted.
689# From here, we generate a correct .tmp_kallsyms2.o
690# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
691# o Verify that the System.map from vmlinux matches the map from
692# .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
693# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
694# .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
695# temporary bypass to allow the kernel to be built while the
696# maintainers work out what went wrong with kallsyms.
697
698ifdef CONFIG_KALLSYMS_EXTRA_PASS
699last_kallsyms := 3
700else
701last_kallsyms := 2
702endif
703
704kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
705
706define verify_kallsyms
Sam Ravnborg46352812006-08-08 21:41:18 +0200707 $(Q)$(if $($(quiet)cmd_sysmap), \
708 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
Sam Ravnborg46352812006-08-08 21:41:18 +0200710 $(Q)cmp -s System.map .tmp_System.map || \
711 (echo Inconsistent kallsyms data; \
712 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 rm .tmp_kallsyms* ; /bin/false )
714endef
715
716# Update vmlinux version before link
717# Use + in front of this rule to silent warning about make -j1
Sam Ravnborg72ba47c2005-07-27 11:39:37 +0200718# First command is ':' to allow us to use + in front of this rule
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719cmd_ksym_ld = $(cmd_vmlinux__)
720define rule_ksym_ld
Sam Ravnborg72ba47c2005-07-27 11:39:37 +0200721 :
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 +$(call cmd,vmlinux_version)
723 $(call cmd,vmlinux__)
724 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
725endef
726
727# Generate .S file with all kernel symbols
728quiet_cmd_kallsyms = KSYM $@
729 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
730 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
731
732.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
733 $(call if_changed_dep,as_o_S)
734
735.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
736 $(call cmd,kallsyms)
737
738# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
739.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
740 $(call if_changed_rule,ksym_ld)
741
742.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
743 $(call if_changed,vmlinux__)
744
745.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
746 $(call if_changed,vmlinux__)
747
748# Needs to visit scripts/ before $(KALLSYMS) can be used.
749$(KALLSYMS): scripts ;
750
Sam Ravnborg33bc25e2005-07-14 20:19:08 +0000751# Generate some data for debugging strange kallsyms problems
752debug_kallsyms: .tmp_map$(last_kallsyms)
753
754.tmp_map%: .tmp_vmlinux% FORCE
755 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
756
757.tmp_map3: .tmp_map2
758
759.tmp_map2: .tmp_map1
760
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761endif # ifdef CONFIG_KALLSYMS
762
Sam Ravnborg741f98f2007-07-17 10:54:06 +0200763# Do modpost on a prelinked vmlinux. The finally linked vmlinux has
764# relevant sections renamed as per the linker script.
765quiet_cmd_vmlinux-modpost = LD $@
766 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
767 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
768 $(filter-out $(vmlinux-init) $(vmlinux-main) $(vmlinux-lds) FORCE ,$^)
769define rule_vmlinux-modpost
770 :
771 +$(call cmd,vmlinux-modpost)
772 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
773 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
774endef
775
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776# vmlinux image - including updated kernel symbols
Sam Ravnborg741f98f2007-07-17 10:54:06 +0200777vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) vmlinux.o FORCE
David Woodhouse0f836e52006-10-11 01:21:43 -0700778ifdef CONFIG_HEADERS_CHECK
David Woodhouse0e7af8d042006-10-13 16:04:23 +0100779 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
David Woodhouse0f836e52006-10-11 01:21:43 -0700780endif
Mathieu Desnoyers267c4022007-10-18 23:41:07 -0700781ifdef CONFIG_SAMPLES
782 $(Q)$(MAKE) $(build)=samples
783endif
Sam Ravnborg741f98f2007-07-17 10:54:06 +0200784 $(call vmlinux-modpost)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 $(call if_changed_rule,vmlinux__)
Jan Beulich4e25d8b2005-09-08 17:07:35 +0200786 $(Q)rm -f .old_version
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787
Sam Ravnborg741f98f2007-07-17 10:54:06 +0200788vmlinux.o: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
789 $(call if_changed_rule,vmlinux-modpost)
790
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791# The actual objects are generated when descending,
792# make sure no implicit rule kicks in
793$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
794
795# Handle descending into subdirectories listed in $(vmlinux-dirs)
796# Preset locale variables to speed up the build process. Limit locale
797# tweaks to this spot to avoid wrong language settings when running
798# make menuconfig etc.
799# Error messages still appears in the original language
800
Paul Smith4f193362006-03-05 17:14:10 -0500801PHONY += $(vmlinux-dirs)
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200802$(vmlinux-dirs): prepare scripts
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803 $(Q)$(MAKE) $(build)=$@
804
Sam Ravnborgcb584552006-01-09 21:20:34 +0100805# Build the kernel release string
Sam Ravnborgcb584552006-01-09 21:20:34 +0100806#
Robert P. J. Day1ef98852006-09-12 12:38:19 -0400807# The KERNELRELEASE value built here is stored in the file
808# include/config/kernel.release, and is used when executing several
809# make targets, such as "make install" or "make modules_install."
810#
811# The eventual kernel release string consists of the following fields,
812# shown in a hierarchical format to show how smaller parts are concatenated
813# to form the larger and final value, with values coming from places like
814# the Makefile, kernel config options, make command line options and/or
815# SCM tag information.
816#
817# $(KERNELVERSION)
818# $(VERSION) eg, 2
819# $(PATCHLEVEL) eg, 6
820# $(SUBLEVEL) eg, 18
821# $(EXTRAVERSION) eg, -rc6
822# $(localver-full)
823# $(localver)
Oleg Verych76c32952007-02-06 02:18:22 +0100824# localversion* (files without backups, containing '~')
Robert P. J. Day1ef98852006-09-12 12:38:19 -0400825# $(CONFIG_LOCALVERSION) (from kernel config setting)
826# $(localver-auto) (only if CONFIG_LOCALVERSION_AUTO is set)
827# ./scripts/setlocalversion (SCM tag, if one exists)
828# $(LOCALVERSION) (from make command line if provided)
829#
830# Note how the final $(localver-auto) string is included *only* if the
831# kernel config option CONFIG_LOCALVERSION_AUTO is selected. Also, at the
832# moment, only git is supported but other SCMs can edit the script
833# scripts/setlocalversion and add the appropriate checks as needed.
Sam Ravnborgcb584552006-01-09 21:20:34 +0100834
Oleg Verych76c32952007-02-06 02:18:22 +0100835pattern = ".*/localversion[^~]*"
836string = $(shell cat /dev/null \
Linus Torvaldsfd19e442007-02-12 15:05:15 -0800837 `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
Sam Ravnborgcb584552006-01-09 21:20:34 +0100838
Oleg Verych76c32952007-02-06 02:18:22 +0100839localver = $(subst $(space),, $(string) \
840 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200841
Sam Ravnborgcb584552006-01-09 21:20:34 +0100842# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
843# and if the SCM is know a tag from the SCM is appended.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200844# The appended tag is determined by the SCM used.
Sam Ravnborgcb584552006-01-09 21:20:34 +0100845#
846# Currently, only git is supported.
847# Other SCMs can edit scripts/setlocalversion and add the appropriate
848# checks as needed.
849ifdef CONFIG_LOCALVERSION_AUTO
850 _localver-auto = $(shell $(CONFIG_SHELL) \
851 $(srctree)/scripts/setlocalversion $(srctree))
852 localver-auto = $(LOCALVERSION)$(_localver-auto)
853endif
854
855localver-full = $(localver)$(localver-auto)
856
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700857# Store (new) KERNELRELASE string in include/config/kernel.release
Sam Ravnborg2244cbd2006-01-16 12:12:12 +0100858kernelrelease = $(KERNELVERSION)$(localver-full)
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700859include/config/kernel.release: include/config/auto.conf FORCE
Sam Ravnborg2244cbd2006-01-16 12:12:12 +0100860 $(Q)rm -f $@
861 $(Q)echo $(kernelrelease) > $@
Sam Ravnborgcb584552006-01-09 21:20:34 +0100862
863
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864# Things we need to do before we recursively start building the kernel
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200865# or the modules are listed in "prepare".
866# A multi level approach is used. prepareN is processed before prepareN-1.
867# archprepare is used in arch Makefiles and when processed asm symlink,
868# version.h and scripts_basic is processed / created.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200870# Listed in dependency order
Paul Smith4f193362006-03-05 17:14:10 -0500871PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200872
Sam Ravnborg86feeaa2005-09-09 19:28:28 +0200873# prepare3 is used to check if we are building in a separate output directory,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874# and if so do:
875# 1) Check that make has not been executed in the kernel src $(srctree)
876# 2) Create the include2 directory, used for the second asm symlink
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700877prepare3: include/config/kernel.release
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878ifneq ($(KBUILD_SRC),)
879 @echo ' Using $(srctree) as source for kernel'
Roman Zippelc955cca2006-06-08 22:12:39 -0700880 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 echo " $(srctree) is not clean, please run 'make mrproper'";\
882 echo " in the '$(srctree)' directory.";\
883 /bin/false; \
884 fi;
885 $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
Thomas Gleixner96a388d2007-10-11 11:20:03 +0200886 $(Q)ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887endif
888
Sam Ravnborg86feeaa2005-09-09 19:28:28 +0200889# prepare2 creates a makefile if using a separate output directory
890prepare2: prepare3 outputmakefile
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891
Roman Zippel3eb3c742007-01-10 14:45:28 +0100892prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
893 include/asm include/config/auto.conf
Sam Ravnborg7bb9d092007-10-19 22:20:02 +0200894 $(cmd_crmodverdir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200896archprepare: prepare1 scripts_basic
897
898prepare0: archprepare FORCE
Sam Ravnborg8d36a622005-09-10 21:05:36 +0200899 $(Q)$(MAKE) $(build)=.
Sam Ravnborgc53aeca2007-03-27 22:50:29 +0200900 $(Q)$(MAKE) $(build)=. missing-syscalls
Sam Ravnborg86feeaa2005-09-09 19:28:28 +0200901
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902# All the preparing..
Robert P. J. Dayd395efb2007-02-14 00:33:01 -0800903prepare: prepare0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200905# Leave this as default for preprocessing vmlinux.lds.S, which is now
906# done in arch/$(ARCH)/kernel/Makefile
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907
908export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
909
Sam Ravnborgfc333b22007-10-17 23:30:14 +0200910# The asm symlink changes when $(ARCH) changes.
911# Detect this and ask user to run make mrproper
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912
Sam Ravnborgfc333b22007-10-17 23:30:14 +0200913include/asm: FORCE
914 $(Q)set -e; asmlink=`readlink include/asm | cut -d '-' -f 2`; \
915 if [ -L include/asm ]; then \
916 if [ "$$asmlink" != "$(SRCARCH)" ]; then \
917 echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
918 echo " set ARCH or save .config and run 'make mrproper' to fix it"; \
919 exit 1; \
920 fi; \
921 else \
922 echo ' SYMLINK $@ -> include/asm-$(SRCARCH)'; \
923 if [ ! -d include ]; then \
924 mkdir -p include; \
925 fi; \
926 ln -fsn asm-$(SRCARCH) $@; \
927 fi
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929# Generate some files
930# ---------------------------------------------------------------------------
931
932# KERNELRELEASE can change from a few different places, meaning version.h
933# needs to be updated, so this check is forced on all builds
934
935uts_len := 64
Sam Ravnborg63104ee2006-07-03 23:30:54 +0200936define filechk_utsrelease.h
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
Sam Ravnborg63104ee2006-07-03 23:30:54 +0200938 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
939 exit 1; \
940 fi; \
941 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942endef
943
Sam Ravnborg63104ee2006-07-03 23:30:54 +0200944define filechk_version.h
945 (echo \#define LINUX_VERSION_CODE $(shell \
946 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
947 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
948endef
949
950include/linux/version.h: $(srctree)/Makefile FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 $(call filechk,version.h)
952
Sam Ravnborg63104ee2006-07-03 23:30:54 +0200953include/linux/utsrelease.h: include/config/kernel.release FORCE
954 $(call filechk,utsrelease.h)
955
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956# ---------------------------------------------------------------------------
957
Paul Smith4f193362006-03-05 17:14:10 -0500958PHONY += depend dep
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959depend dep:
960 @echo '*** Warning: make $@ is unnecessary now.'
961
962# ---------------------------------------------------------------------------
David Woodhouse8d730cf2006-06-18 11:58:39 +0100963# Kernel headers
David Woodhouse1ab7a1f2006-09-16 12:15:55 -0700964INSTALL_HDR_PATH=$(objtree)/usr
David Woodhouse8d730cf2006-06-18 11:58:39 +0100965export INSTALL_HDR_PATH
966
Thomas Gleixner96a388d2007-10-11 11:20:03 +0200967HDRFILTER=generic i386 x86_64
968HDRARCHES=$(filter-out $(HDRFILTER),$(patsubst $(srctree)/include/asm-%/Kbuild,%,$(wildcard $(srctree)/include/asm-*/Kbuild)))
David Woodhouse6d716272006-09-24 22:16:03 +0100969
970PHONY += headers_install_all
Roman Zippel3eb3c742007-01-10 14:45:28 +0100971headers_install_all: include/linux/version.h scripts_basic FORCE
Linus Torvalds398477d2006-09-24 14:55:52 -0700972 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
David Woodhouse6d716272006-09-24 22:16:03 +0100973 $(Q)for arch in $(HDRARCHES); do \
Linus Torvalds398477d2006-09-24 14:55:52 -0700974 $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch ;\
David Woodhouse6d716272006-09-24 22:16:03 +0100975 done
976
David Woodhouse8d730cf2006-06-18 11:58:39 +0100977PHONY += headers_install
Roman Zippel3eb3c742007-01-10 14:45:28 +0100978headers_install: include/linux/version.h scripts_basic FORCE
Thomas Gleixner96a388d2007-10-11 11:20:03 +0200979 @if [ ! -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
980 echo '*** Error: Headers not exportable for this architecture ($(SRCARCH))'; \
David Woodhousef17b7ba2006-09-21 09:01:45 +0100981 exit 1 ; fi
Sam Ravnborg07aea3a2006-07-23 20:47:50 +0200982 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
Thomas Gleixner96a388d2007-10-11 11:20:03 +0200983 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include
David Woodhouse8d730cf2006-06-18 11:58:39 +0100984
Mike Frysinger1f857122007-02-14 00:33:02 -0800985PHONY += headers_check_all
986headers_check_all: headers_install_all
987 $(Q)for arch in $(HDRARCHES); do \
988 $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch HDRCHECK=1 ;\
989 done
990
David Woodhouse68475352006-06-18 12:02:10 +0100991PHONY += headers_check
992headers_check: headers_install
Thomas Gleixner96a388d2007-10-11 11:20:03 +0200993 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include HDRCHECK=1
David Woodhouse68475352006-06-18 12:02:10 +0100994
David Woodhouse8d730cf2006-06-18 11:58:39 +0100995# ---------------------------------------------------------------------------
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996# Modules
997
998ifdef CONFIG_MODULES
999
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001000# By default, build modules as well
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001
1002all: modules
1003
1004# Build modules
1005
Paul Smith4f193362006-03-05 17:14:10 -05001006PHONY += modules
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1008 @echo ' Building modules, stage 2.';
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001009 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010
1011
1012# Target to prepare building external modules
Paul Smith4f193362006-03-05 17:14:10 -05001013PHONY += modules_prepare
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001014modules_prepare: prepare scripts
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015
1016# Target to install modules
Paul Smith4f193362006-03-05 17:14:10 -05001017PHONY += modules_install
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018modules_install: _modinst_ _modinst_post
1019
Paul Smith4f193362006-03-05 17:14:10 -05001020PHONY += _modinst_
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021_modinst_:
Tom Rinice454d42005-07-15 07:56:36 -07001022 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023 echo "Warning: you may need to install module-init-tools"; \
1024 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1025 sleep 1; \
1026 fi
1027 @rm -rf $(MODLIB)/kernel
1028 @rm -f $(MODLIB)/source
1029 @mkdir -p $(MODLIB)/kernel
1030 @ln -s $(srctree) $(MODLIB)/source
1031 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1032 rm -f $(MODLIB)/build ; \
1033 ln -s $(objtree) $(MODLIB)/build ; \
1034 fi
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001035 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001037# This depmod is only for convenience to give the initial
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038# boot a modules.dep even before / is mounted read-write. However the
1039# boot script depmod is the master version.
Paul Smith4f193362006-03-05 17:14:10 -05001040PHONY += _modinst_post
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041_modinst_post: _modinst_
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001042 $(call cmd,depmod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043
1044else # CONFIG_MODULES
1045
1046# Modules not configured
1047# ---------------------------------------------------------------------------
1048
1049modules modules_install: FORCE
1050 @echo
1051 @echo "The present kernel configuration has modules disabled."
1052 @echo "Type 'make config' and enable loadable module support."
1053 @echo "Then build a kernel with module support enabled."
1054 @echo
1055 @exit 1
1056
1057endif # CONFIG_MODULES
1058
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059###
1060# Cleaning is done on three levels.
1061# make clean Delete most generated files
1062# Leave enough to build external modules
1063# make mrproper Delete the current configuration, and all generated files
1064# make distclean Remove editor backup files, patch leftover files and the like
1065
1066# Directories & files removed with 'make clean'
1067CLEAN_DIRS += $(MODVERDIR)
1068CLEAN_FILES += vmlinux System.map \
1069 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1070
1071# Directories & files removed with 'make mrproper'
David Woodhouse1ab7a1f2006-09-16 12:15:55 -07001072MRPROPER_DIRS += include/config include2 usr/include
Tore Anderson50aa88e2006-01-07 15:34:40 +01001073MRPROPER_FILES += .config .config.old include/asm .version .old_version \
Roman Zippel3eb3c742007-01-10 14:45:28 +01001074 include/linux/autoconf.h include/linux/version.h \
1075 include/linux/utsrelease.h \
Roman Zippelf1d28fb2006-06-08 22:12:43 -07001076 Module.symvers tags TAGS cscope*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077
1078# clean - Delete most, but leave enough to build external modules
1079#
1080clean: rm-dirs := $(CLEAN_DIRS)
1081clean: rm-files := $(CLEAN_FILES)
Sam Ravnborg86feeaa2005-09-09 19:28:28 +02001082clean-dirs := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083
Paul Smith4f193362006-03-05 17:14:10 -05001084PHONY += $(clean-dirs) clean archclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085$(clean-dirs):
1086 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1087
1088clean: archclean $(clean-dirs)
1089 $(call cmd,rmdirs)
1090 $(call cmd,rmfiles)
1091 @find . $(RCS_FIND_IGNORE) \
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001092 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
Andreas Gruenbacher15fde672006-05-09 20:37:30 +02001093 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1094 -o -name '*.symtypes' \) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095 -type f -print | xargs rm -f
1096
1097# mrproper - Delete all generated files, including .config
1098#
1099mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1100mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1101mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1102
Paul Smith4f193362006-03-05 17:14:10 -05001103PHONY += $(mrproper-dirs) mrproper archmrproper
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104$(mrproper-dirs):
1105 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1106
1107mrproper: clean archmrproper $(mrproper-dirs)
1108 $(call cmd,rmdirs)
1109 $(call cmd,rmfiles)
1110
1111# distclean
1112#
Paul Smith4f193362006-03-05 17:14:10 -05001113PHONY += distclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114
1115distclean: mrproper
1116 @find $(srctree) $(RCS_FIND_IGNORE) \
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001117 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001118 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001119 -o -name '.*.rej' -o -size 0 \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1121 -type f -print | xargs rm -f
1122
1123
1124# Packaging of the kernel to various formats
1125# ---------------------------------------------------------------------------
1126# rpm target kept for backward compatibility
1127package-dir := $(srctree)/scripts/package
1128
Zach Brown031ecc62006-06-08 22:12:37 -07001129%pkg: include/config/kernel.release FORCE
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001130 $(Q)$(MAKE) $(build)=$(package-dir) $@
Zach Brown031ecc62006-06-08 22:12:37 -07001131rpm: include/config/kernel.release FORCE
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001132 $(Q)$(MAKE) $(build)=$(package-dir) $@
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133
1134
1135# Brief documentation of the typical targets used
1136# ---------------------------------------------------------------------------
1137
1138boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1139boards := $(notdir $(boards))
1140
1141help:
1142 @echo 'Cleaning targets:'
Samuel Tardieu5ea084e2006-12-12 19:09:40 +01001143 @echo ' clean - Remove most generated files but keep the config and'
Jesper Juhl5cc8d242006-09-24 14:01:08 +02001144 @echo ' enough build support to build external modules'
Samuel Tardieu5ea084e2006-12-12 19:09:40 +01001145 @echo ' mrproper - Remove all generated files + config + various backup files'
Jesper Juhl5cc8d242006-09-24 14:01:08 +02001146 @echo ' distclean - mrproper + remove editor backup and patch files'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147 @echo ''
1148 @echo 'Configuration targets:'
1149 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1150 @echo ''
1151 @echo 'Other generic targets:'
1152 @echo ' all - Build all targets marked with [*]'
1153 @echo '* vmlinux - Build the bare kernel'
1154 @echo '* modules - Build all modules'
Bodo Eggert9cc5d742005-11-23 20:11:34 +01001155 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001156 @echo ' dir/ - Build all files in dir and below'
1157 @echo ' dir/file.[ois] - Build specified target only'
Sam Ravnborg155ad602005-07-07 17:56:08 -07001158 @echo ' dir/file.ko - Build module including final link'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001159 @echo ' rpm - Build a kernel as an RPM package'
1160 @echo ' tags/TAGS - Generate tags file for editors'
1161 @echo ' cscope - Generate cscope index'
Zach Brown6d128842005-09-07 12:08:23 -07001162 @echo ' kernelrelease - Output the release version string'
Sam Ravnborgcb584552006-01-09 21:20:34 +01001163 @echo ' kernelversion - Output the version stored in Makefile'
Thomas Gleixner91e034e2007-10-11 17:53:52 +02001164 @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
David Woodhousef17b7ba2006-09-21 09:01:45 +01001165 echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
Geert Uytterhoeven59df3232007-01-29 13:47:01 +01001166 echo ' (default: $(INSTALL_HDR_PATH))'; \
David Woodhousef17b7ba2006-09-21 09:01:45 +01001167 fi
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168 @echo ''
1169 @echo 'Static analysers'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170 @echo ' checkstack - Generate a list of stack hogs'
1171 @echo ' namespacecheck - Name space analysis on compiled kernel'
Adrian Bunk295ac052007-08-24 23:04:56 +02001172 @echo ' export_report - List the usages of all exported symbols'
Thomas Gleixner91e034e2007-10-11 17:53:52 +02001173 @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
David Woodhousef17b7ba2006-09-21 09:01:45 +01001174 echo ' headers_check - Sanity check on exported headers'; \
1175 fi
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176 @echo ''
1177 @echo 'Kernel packaging:'
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001178 @$(MAKE) $(build)=$(package-dir) help
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 @echo ''
1180 @echo 'Documentation targets:'
1181 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1182 @echo ''
1183 @echo 'Architecture specific targets ($(ARCH)):'
1184 @$(if $(archhelp),$(archhelp),\
1185 echo ' No architecture specific help defined for $(ARCH)')
1186 @echo ''
1187 @$(if $(boards), \
1188 $(foreach b, $(boards), \
1189 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1190 echo '')
1191
1192 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
Sam Ravnborg45d506b2006-08-08 21:35:14 +02001193 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
Dustin Kirkland701842e2006-05-23 15:57:23 -05001195 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1196 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197 @echo ''
1198 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1199 @echo 'For further info see the ./README file'
1200
1201
1202# Documentation targets
1203# ---------------------------------------------------------------------------
1204%docs: scripts_basic FORCE
1205 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1206
1207else # KBUILD_EXTMOD
1208
1209###
1210# External module support.
1211# When building external modules the kernel used as basis is considered
1212# read-only, and no consistency checks are made and the make
1213# system is not used on the basis kernel. If updates are required
1214# in the basis kernel ordinary make commands (without M=...) must
1215# be used.
1216#
1217# The following are the only valid targets when building external
1218# modules.
1219# make M=dir clean Delete all automatically generated files
1220# make M=dir modules Make all modules in specified dir
1221# make M=dir Same as 'make M=dir modules'
1222# make M=dir modules_install
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001223# Install the modules built in the module directory
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224# Assumes install directory is already created
1225
1226# We are always building modules
1227KBUILD_MODULES := 1
Paul Smith4f193362006-03-05 17:14:10 -05001228PHONY += crmodverdir
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229crmodverdir:
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001230 $(cmd_crmodverdir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231
Paul Smith4f193362006-03-05 17:14:10 -05001232PHONY += $(objtree)/Module.symvers
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233$(objtree)/Module.symvers:
1234 @test -e $(objtree)/Module.symvers || ( \
1235 echo; \
1236 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1237 echo " is missing; modules will have no dependencies and modversions."; \
1238 echo )
1239
1240module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
Paul Smith4f193362006-03-05 17:14:10 -05001241PHONY += $(module-dirs) modules
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242$(module-dirs): crmodverdir $(objtree)/Module.symvers
1243 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1244
1245modules: $(module-dirs)
1246 @echo ' Building modules, stage 2.';
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001247 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248
Paul Smith4f193362006-03-05 17:14:10 -05001249PHONY += modules_install
Sam Ravnborga67dc212006-01-28 23:51:57 +01001250modules_install: _emodinst_ _emodinst_post
Adrian Bunke6304662006-02-14 15:58:15 +01001251
Paul Smith4f193362006-03-05 17:14:10 -05001252install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1253PHONY += _emodinst_
Sam Ravnborga67dc212006-01-28 23:51:57 +01001254_emodinst_:
Sam Ravnborga67dc212006-01-28 23:51:57 +01001255 $(Q)mkdir -p $(MODLIB)/$(install-dir)
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001256 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
Linus Torvalds1da177e2005-04-16 15:20:36 -07001257
Paul Smith4f193362006-03-05 17:14:10 -05001258PHONY += _emodinst_post
Sam Ravnborga67dc212006-01-28 23:51:57 +01001259_emodinst_post: _emodinst_
1260 $(call cmd,depmod)
1261
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1263
Paul Smith4f193362006-03-05 17:14:10 -05001264PHONY += $(clean-dirs) clean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001265$(clean-dirs):
1266 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1267
1268clean: rm-dirs := $(MODVERDIR)
Mike Frysingerc34114f2007-07-31 19:45:34 -04001269clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270clean: $(clean-dirs)
1271 $(call cmd,rmdirs)
Mike Frysingerc34114f2007-07-31 19:45:34 -04001272 $(call cmd,rmfiles)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001274 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1276 -type f -print | xargs rm -f
1277
1278help:
1279 @echo ' Building external modules.'
1280 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1281 @echo ''
1282 @echo ' modules - default target, build the module(s)'
1283 @echo ' modules_install - install the module'
1284 @echo ' clean - remove generated files in module directory only'
1285 @echo ''
Sam Ravnborg06300b22006-01-25 07:13:18 +01001286
1287# Dummies...
Paul Smith4f193362006-03-05 17:14:10 -05001288PHONY += prepare scripts
Sam Ravnborg06300b22006-01-25 07:13:18 +01001289prepare: ;
1290scripts: ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291endif # KBUILD_EXTMOD
1292
1293# Generate tags for editors
1294# ---------------------------------------------------------------------------
1295
1296#We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1297#(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1298#Adding $(srctree) adds about 20M on i386 to the size of the output file!
1299
George Anzingerf182ae62005-07-07 17:56:06 -07001300ifeq ($(src),$(obj))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301__srctree =
1302else
1303__srctree = $(srctree)/
1304endif
1305
Paolo 'Blaisorblade' Giarrusso2ab23c92005-11-13 16:07:00 -08001306ifeq ($(ALLSOURCE_ARCHS),)
1307ifeq ($(ARCH),um)
1308ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1309else
Thomas Gleixner2eb4c952007-10-11 11:11:38 +02001310ALLINCLUDE_ARCHS := $(SRCARCH)
Paolo 'Blaisorblade' Giarrusso2ab23c92005-11-13 16:07:00 -08001311endif
1312else
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001313#Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behavour.
Paolo 'Blaisorblade' Giarrusso2ab23c92005-11-13 16:07:00 -08001314ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1315endif
1316
Thomas Gleixner2eb4c952007-10-11 11:11:38 +02001317# Take care of arch/x86
1318ifeq ($(ARCH), $(SRCARCH))
Ian Campbella0674e82005-06-23 11:25:54 +01001319ALLSOURCE_ARCHS := $(ARCH)
Thomas Gleixner2eb4c952007-10-11 11:11:38 +02001320else
1321ALLSOURCE_ARCHS := $(ARCH) $(SRCARCH)
1322endif
Ian Campbella0674e82005-06-23 11:25:54 +01001323
Masatake YAMATOe838db62006-06-22 12:21:20 +09001324define find-sources
Yinghai Luf8bea582007-10-16 00:28:06 -07001325 ( for arch in $(ALLSOURCE_ARCHS) ; do \
1326 find $(__srctree)arch/$${arch} $(RCS_FIND_IGNORE) \
Masatake YAMATOe838db62006-06-22 12:21:20 +09001327 -name $1 -print; \
Ian Campbella0674e82005-06-23 11:25:54 +01001328 done ; \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329 find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
Masatake YAMATOe838db62006-06-22 12:21:20 +09001330 -name $1 -print; \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331 find $(__srctree)include $(RCS_FIND_IGNORE) \
1332 \( -name config -o -name 'asm-*' \) -prune \
Masatake YAMATOe838db62006-06-22 12:21:20 +09001333 -o -name $1 -print; \
Yinghai Luf8bea582007-10-16 00:28:06 -07001334 for arch in $(ALLINCLUDE_ARCHS) ; do \
1335 find $(__srctree)include/asm-$${arch} $(RCS_FIND_IGNORE) \
Masatake YAMATOe838db62006-06-22 12:21:20 +09001336 -name $1 -print; \
Ian Campbella0674e82005-06-23 11:25:54 +01001337 done ; \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338 find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
Don Mullisdd7e54a2007-01-04 10:14:52 -08001339 -name $1 -print; \
1340 find $(__srctree) $(RCS_FIND_IGNORE) \
Yinghai Lu37ab7a22007-10-17 16:43:39 -07001341 \( -name include -o -name arch -o -name '.tmp_*' \) -prune -o \
Don Mullisdd7e54a2007-01-04 10:14:52 -08001342 -name $1 -print; \
1343 )
Masatake YAMATOe838db62006-06-22 12:21:20 +09001344endef
1345
1346define all-sources
1347 $(call find-sources,'*.[chS]')
1348endef
1349define all-kconfigs
1350 $(call find-sources,'Kconfig*')
1351endef
1352define all-defconfigs
1353 $(call find-sources,'defconfig')
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354endef
1355
Aron Griffisda7c0402006-09-21 00:27:02 -04001356define xtags
1357 if $1 --version 2>&1 | grep -iq exuberant; then \
1358 $(all-sources) | xargs $1 -a \
1359 -I __initdata,__exitdata,__acquires,__releases \
1360 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
Aneesh Kumar K.V91b943e2006-10-17 00:10:32 -07001361 --extra=+f --c-kinds=+px \
Aneesh Kumar K.Va412c172007-07-09 11:43:57 -07001362 --regex-asm='/^ENTRY\(([^)]*)\).*/\1/'; \
Aron Griffisda7c0402006-09-21 00:27:02 -04001363 $(all-kconfigs) | xargs $1 -a \
1364 --langdef=kconfig \
1365 --language-force=kconfig \
1366 --regex-kconfig='/^[[:blank:]]*config[[:blank:]]+([[:alnum:]_]+)/\1/'; \
David Gibson18e39912006-10-04 02:15:32 -07001367 $(all-defconfigs) | xargs -r $1 -a \
Aron Griffisda7c0402006-09-21 00:27:02 -04001368 --langdef=dotconfig \
1369 --language-force=dotconfig \
1370 --regex-dotconfig='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'; \
1371 elif $1 --version 2>&1 | grep -iq emacs; then \
1372 $(all-sources) | xargs $1 -a; \
1373 $(all-kconfigs) | xargs $1 -a \
1374 --regex='/^[ \t]*config[ \t]+\([a-zA-Z0-9_]+\)/\1/'; \
David Gibson18e39912006-10-04 02:15:32 -07001375 $(all-defconfigs) | xargs -r $1 -a \
Aron Griffisda7c0402006-09-21 00:27:02 -04001376 --regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'; \
1377 else \
1378 $(all-sources) | xargs $1 -a; \
1379 fi
1380endef
1381
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382quiet_cmd_cscope-file = FILELST cscope.files
Karl Hegbloomacbef452005-06-19 00:50:47 -07001383 cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384
1385quiet_cmd_cscope = MAKE cscope.out
Karl Hegbloomacbef452005-06-19 00:50:47 -07001386 cmd_cscope = cscope -b
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387
1388cscope: FORCE
1389 $(call cmd,cscope-file)
1390 $(call cmd,cscope)
1391
1392quiet_cmd_TAGS = MAKE $@
Sam Ravnborg66d609e2005-07-28 23:11:34 +02001393define cmd_TAGS
1394 rm -f $@; \
Aron Griffisda7c0402006-09-21 00:27:02 -04001395 $(call xtags,etags)
Sam Ravnborg66d609e2005-07-28 23:11:34 +02001396endef
Linus Torvalds1da177e2005-04-16 15:20:36 -07001397
Sam Ravnborg66d609e2005-07-28 23:11:34 +02001398TAGS: FORCE
1399 $(call cmd,TAGS)
1400
Linus Torvalds1da177e2005-04-16 15:20:36 -07001401quiet_cmd_tags = MAKE $@
1402define cmd_tags
1403 rm -f $@; \
Aron Griffisda7c0402006-09-21 00:27:02 -04001404 $(call xtags,ctags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405endef
1406
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407tags: FORCE
1408 $(call cmd,tags)
1409
1410
1411# Scripts to check various things for consistency
1412# ---------------------------------------------------------------------------
1413
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414includecheck:
1415 find * $(RCS_FIND_IGNORE) \
1416 -name '*.[hcS]' -type f -print | sort \
1417 | xargs $(PERL) -w scripts/checkincludes.pl
1418
1419versioncheck:
1420 find * $(RCS_FIND_IGNORE) \
1421 -name '*.[hcS]' -type f -print | sort \
1422 | xargs $(PERL) -w scripts/checkversion.pl
1423
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424namespacecheck:
1425 $(PERL) $(srctree)/scripts/namespace.pl
1426
Adrian Bunk295ac052007-08-24 23:04:56 +02001427export_report:
1428 $(PERL) $(srctree)/scripts/export_report.pl
1429
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430endif #ifeq ($(config-targets),1)
1431endif #ifeq ($(mixed-targets),1)
1432
Roman Zippelc30a02e2006-06-08 22:12:50 -07001433PHONY += checkstack kernelrelease kernelversion
Jeff Dikee3ccf6e2006-09-27 01:50:37 -07001434
Jeff Dike011e3a92006-12-13 00:34:12 -08001435# UML needs a little special treatment here. It wants to use the host
1436# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1437# else wants $(ARCH), including people doing cross-builds, which means
1438# that $(SUBARCH) doesn't work here.
1439ifeq ($(ARCH), um)
1440CHECKSTACK_ARCH := $(SUBARCH)
1441else
1442CHECKSTACK_ARCH := $(ARCH)
1443endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444checkstack:
1445 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
Jeff Dike011e3a92006-12-13 00:34:12 -08001446 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001447
1448kernelrelease:
Roman Zippelf1d28fb2006-06-08 22:12:43 -07001449 $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1450 $(error kernelrelease not valid - run 'make prepare' to update it))
Sam Ravnborgcb584552006-01-09 21:20:34 +01001451kernelversion:
Sam Ravnborg2244cbd2006-01-16 12:12:12 +01001452 @echo $(KERNELVERSION)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453
Sam Ravnborg06300b22006-01-25 07:13:18 +01001454# Single targets
1455# ---------------------------------------------------------------------------
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001456# Single targets are compatible with:
1457# - build whith mixed source and output
1458# - build with separate output dir 'make O=...'
1459# - external modules
1460#
1461# target-dir => where to store outputfile
1462# build-dir => directory in kernel source tree to use
Sam Ravnborg06300b22006-01-25 07:13:18 +01001463
Sam Ravnborg06300b22006-01-25 07:13:18 +01001464ifeq ($(KBUILD_EXTMOD),)
Sam Ravnborgaa360872006-04-06 08:25:31 +02001465 build-dir = $(patsubst %/,%,$(dir $@))
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001466 target-dir = $(dir $@)
Sam Ravnborg06300b22006-01-25 07:13:18 +01001467else
1468 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001469 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1470 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
Sam Ravnborg06300b22006-01-25 07:13:18 +01001471endif
1472
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001473%.s: %.c prepare scripts FORCE
1474 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1475%.i: %.c prepare scripts FORCE
1476 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1477%.o: %.c prepare scripts FORCE
1478 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1479%.lst: %.c prepare scripts FORCE
1480 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1481%.s: %.S prepare scripts FORCE
1482 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1483%.o: %.S prepare scripts FORCE
1484 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
Andreas Gruenbacher15fde672006-05-09 20:37:30 +02001485%.symtypes: %.c prepare scripts FORCE
1486 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001487
1488# Modules
1489/ %/: prepare scripts FORCE
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001490 $(cmd_crmodverdir)
Sam Ravnborg06300b22006-01-25 07:13:18 +01001491 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001492 $(build)=$(build-dir)
1493%.ko: prepare scripts FORCE
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001494 $(cmd_crmodverdir)
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
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001508# Run depmod only is we have System.map and depmod is executable
1509# and we build for the host arch
1510quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1511 cmd_depmod = \
Sam Ravnborgd8d2e782007-10-22 11:30:45 +02001512 if [ -r System.map -a -x $(DEPMOD) ]; then \
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001513 $(DEPMOD) -ae -F System.map \
1514 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) -r) \
1515 $(KERNELRELEASE); \
1516 fi
1517
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001518# Create temporary dir for module support files
Sam Ravnborgab19f872007-10-22 11:23:07 +02001519# clean it up only when building all modules
1520cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1521 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001522
Sam Ravnborg222d3942007-10-15 21:59:31 +02001523a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
Sam Ravnborg06c50402007-10-15 22:17:25 +02001524 $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \
Sam Ravnborg5e8d7802006-07-01 09:58:02 +02001525 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001526
1527quiet_cmd_as_o_S = AS $@
1528cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1529
1530# read all saved command lines
1531
1532targets := $(wildcard $(sort $(targets)))
1533cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1534
1535ifneq ($(cmd_files),)
1536 $(cmd_files): ; # Do not try to update included dependency files
1537 include $(cmd_files)
1538endif
1539
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1541# Usage:
1542# $(Q)$(MAKE) $(clean)=dir
1543clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1544
Linus Torvalds1da177e2005-04-16 15:20:36 -07001545endif # skip-makefile
1546
Paul Smith4f193362006-03-05 17:14:10 -05001547PHONY += FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548FORCE:
Paul Smith4f193362006-03-05 17:14:10 -05001549
Oleg Verych15964862006-12-10 02:18:40 -08001550# Cancel implicit rules on top Makefile, `-rR' will apply to sub-makes.
1551Makefile: ;
Paul Smith4f193362006-03-05 17:14:10 -05001552
1553# Declare the contents of the .PHONY variable as phony. We keep that
1554# information in a variable se we can use it in if_changed and friends.
1555.PHONY: $(PHONY)