blob: 0ad6e8d9b0b3a04ed3d087bf3edd70fa5298146d [file] [log] [blame]
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))
Paul Smith4f193362006-03-05 17:14:10 -0500121PHONY += $(MAKECMDGOALS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
Benjamin LaHaise36cbbe52006-02-15 15:17:35 -0800123$(filter-out _all,$(MAKECMDGOALS)) _all:
Sam Ravnborg23a45e22005-07-27 09:12:07 +0200124 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
125 KBUILD_SRC=$(CURDIR) \
Benjamin LaHaise36cbbe52006-02-15 15:17:35 -0800126 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile $@
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
128# Leave processing to above invocation of make
129skip-makefile := 1
130endif # ifneq ($(KBUILD_OUTPUT),)
131endif # ifeq ($(KBUILD_SRC),)
132
133# We process the rest of the Makefile if this is the final invocation of make
134ifeq ($(skip-makefile),)
135
136# If building an external module we do not care about the all: rule
137# but instead _all depend on modules
Paul Smith4f193362006-03-05 17:14:10 -0500138PHONY += all
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139ifeq ($(KBUILD_EXTMOD),)
140_all: all
141else
142_all: modules
143endif
144
145srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
146TOPDIR := $(srctree)
147# FIXME - TOPDIR is obsolete, use srctree/objtree
148objtree := $(CURDIR)
149src := $(srctree)
150obj := $(objtree)
151
Mattia Dongili0f558c32006-02-19 13:50:37 +0100152VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
154export srctree objtree VPATH TOPDIR
155
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156
157# SUBARCH tells the usermode build what the underlying arch is. That is set
158# first, and if a usermode build is happening, the "ARCH=um" on the command
159# line overrides the setting of ARCH below. If a native build is happening,
160# then ARCH is assigned, getting whatever value it gets normally, and
161# SUBARCH is subsequently ignored.
162
163SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
164 -e s/arm.*/arm/ -e s/sa110/arm/ \
Linus Torvalds39990b52005-11-11 14:27:32 -0800165 -e s/s390x/s390/ -e s/parisc64/parisc/ \
Martin Michlmayr89992572006-01-28 18:38:15 +0000166 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167
168# Cross compiling and selecting different set of gcc/bin-utils
169# ---------------------------------------------------------------------------
170#
171# When performing cross compilation for other architectures ARCH shall be set
172# to the target architecture. (See arch/* for the possibilities).
173# ARCH can be set during invocation of make:
174# make ARCH=ia64
175# Another way is to have ARCH set in the environment.
176# The default ARCH is the host where make is executed.
177
178# CROSS_COMPILE specify the prefix used for all executables used
179# during compilation. Only gcc and related bin-utils executables
180# are prefixed with $(CROSS_COMPILE).
181# CROSS_COMPILE can be set on the command line
182# make CROSS_COMPILE=ia64-linux-
183# Alternatively CROSS_COMPILE can be set in the environment.
184# Default value for CROSS_COMPILE is not to prefix executables
185# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
186
187ARCH ?= $(SUBARCH)
188CROSS_COMPILE ?=
189
190# Architecture as present in compile.h
Thomas Gleixner6752ed92007-10-11 11:11:36 +0200191UTS_MACHINE := $(ARCH)
192SRCARCH := $(ARCH)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700194KCONFIG_CONFIG ?= .config
195
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196# SHELL used by kbuild
197CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
198 else if [ -x /bin/bash ]; then echo /bin/bash; \
199 else echo sh; fi ; fi)
200
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200201HOSTCC = gcc
202HOSTCXX = g++
203HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
204HOSTCXXFLAGS = -O2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200206# Decide whether to build built-in, modular, or both.
207# Normally, just do built-in.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208
209KBUILD_MODULES :=
210KBUILD_BUILTIN := 1
211
212# If we have only "make modules", don't compile built-in objects.
213# When we're building modules with modversions, we need to consider
214# the built-in objects during the descend as well, in order to
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200215# make sure the checksums are up to date before we record them.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216
217ifeq ($(MAKECMDGOALS),modules)
218 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
219endif
220
221# If we have "make <whatever> modules", compile modules
222# in addition to whatever we do anyway.
223# Just "make" or "make all" shall build modules as well
224
225ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
226 KBUILD_MODULES := 1
227endif
228
229ifeq ($(MAKECMDGOALS),)
230 KBUILD_MODULES := 1
231endif
232
Sam Ravnborge579d352005-07-27 08:10:10 +0200233export KBUILD_MODULES KBUILD_BUILTIN
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
235
236# Beautify output
237# ---------------------------------------------------------------------------
238#
239# Normally, we echo the whole command before executing it. By making
240# that echo $($(quiet)$(cmd)), we now have the possibility to set
241# $(quiet) to choose other forms of output instead, e.g.
242#
243# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
244# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
245#
246# If $(quiet) is empty, the whole command will be printed.
247# If it is set to "quiet_", only the short version will be printed.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200248# If it is set to "silent_", nothing will be printed at all, since
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249# the variable $(silent_cmd_cc_o_c) doesn't exist.
250#
Adrian Bunka58a4142006-01-10 00:08:17 +0100251# A simple variant is to prefix commands with $(Q) - that's useful
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252# for commands that shall be hidden in non-verbose mode.
253#
254# $(Q)ln $@ :<
255#
256# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
257# If KBUILD_VERBOSE equals 1 then the above command is displayed.
258
259ifeq ($(KBUILD_VERBOSE),1)
260 quiet =
261 Q =
262else
263 quiet=quiet_
264 Q = @
265endif
266
267# If the user is running make -s (silent mode), suppress echoing of
268# commands
269
270ifneq ($(findstring s,$(MAKEFLAGS)),)
271 quiet=silent_
272endif
273
274export quiet Q KBUILD_VERBOSE
275
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276
277# Look for make include files relative to root of kernel src
278MAKEFLAGS += --include-dir=$(srctree)
279
Oleg Verych15964862006-12-10 02:18:40 -0800280# We need some generic definitions.
281include $(srctree)/scripts/Kbuild.include
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282
283# Make variables (CC, etc...)
284
285AS = $(CROSS_COMPILE)as
286LD = $(CROSS_COMPILE)ld
287CC = $(CROSS_COMPILE)gcc
288CPP = $(CC) -E
289AR = $(CROSS_COMPILE)ar
290NM = $(CROSS_COMPILE)nm
291STRIP = $(CROSS_COMPILE)strip
292OBJCOPY = $(CROSS_COMPILE)objcopy
293OBJDUMP = $(CROSS_COMPILE)objdump
294AWK = awk
295GENKSYMS = scripts/genksyms/genksyms
296DEPMOD = /sbin/depmod
297KALLSYMS = scripts/kallsyms
298PERL = perl
299CHECK = sparse
300
Al Viroaf4ca452005-10-21 02:55:38 -0400301CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302MODFLAGS = -DMODULE
303CFLAGS_MODULE = $(MODFLAGS)
304AFLAGS_MODULE = $(MODFLAGS)
Roland McGrath114f5152007-07-23 01:12:08 -0700305LDFLAGS_MODULE =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306CFLAGS_KERNEL =
307AFLAGS_KERNEL =
308
309
310# Use LINUXINCLUDE when you must reference the include/ directory.
311# Needed to be compatible with the O= option
312LINUXINCLUDE := -Iinclude \
Russell King2dd34b42005-10-30 22:42:11 +0100313 $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
Zachary Amsdene623a3b2005-11-07 15:27:51 -0800314 -include include/linux/autoconf.h
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315
316CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE)
317
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200318CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
Dave Jones94bed2a2007-07-15 23:41:38 -0700319 -fno-strict-aliasing -fno-common \
320 -Werror-implicit-function-declaration
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200321AFLAGS := -D__ASSEMBLY__
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700323# Read KERNELRELEASE from include/config/kernel.release (if it exists)
324KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
Sam Ravnborg2244cbd2006-01-16 12:12:12 +0100325KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
Sam Ravnborgcb584552006-01-09 21:20:34 +0100326
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200327export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
Thomas Gleixner6752ed92007-10-11 11:11:36 +0200328export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200329export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
330export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331
332export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200333export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
335
336# When compiling out-of-tree modules, put MODVERDIR in the module
337# tree rather than in the kernel tree. The kernel tree might
338# even be read-only.
339export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
340
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341# Files to ignore in find ... statements
342
Trond Myklebust406119f2005-10-27 14:46:53 -0400343RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
344export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345
346# ===========================================================================
347# Rules shared between *config targets and build targets
348
349# Basic helpers built in scripts/
Paul Smith4f193362006-03-05 17:14:10 -0500350PHONY += scripts_basic
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351scripts_basic:
352 $(Q)$(MAKE) $(build)=scripts/basic
353
Jan Beulichcd05e6b2005-09-06 11:47:04 +0200354# To avoid any implicit rule to kick in, define an empty command.
355scripts/basic/%: scripts_basic ;
356
Paul Smith4f193362006-03-05 17:14:10 -0500357PHONY += outputmakefile
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200358# outputmakefile generates a Makefile in the output directory, if using a
359# separate output directory. This allows convenient use of make in the
360# output directory.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361outputmakefile:
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200362ifneq ($(KBUILD_SRC),)
363 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
364 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
365endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366
367# To make sure we do not include .config for any of the *config targets
368# catch them early, and hand them over to scripts/kconfig/Makefile
369# It is allowed to specify more targets when calling make, including
370# mixing *config targets and build targets.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200371# For example 'make oldconfig all'.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372# Detect when mixed targets is specified, and make a second invocation
373# of make so .config is not included in this case either (for *config).
374
Roman Zippel3eb3c742007-01-10 14:45:28 +0100375no-dot-config-targets := clean mrproper distclean \
Roman Zippelc30a02e2006-06-08 22:12:50 -0700376 cscope TAGS tags help %docs check% \
Roman Zippel3eb3c742007-01-10 14:45:28 +0100377 include/linux/version.h headers_% \
378 kernelrelease kernelversion
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379
380config-targets := 0
381mixed-targets := 0
382dot-config := 1
383
384ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
385 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
386 dot-config := 0
387 endif
388endif
389
390ifeq ($(KBUILD_EXTMOD),)
391 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
392 config-targets := 1
393 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
394 mixed-targets := 1
395 endif
396 endif
397endif
398
399ifeq ($(mixed-targets),1)
400# ===========================================================================
401# We're called with mixed targets (*config and build targets).
402# Handle them one by one.
403
404%:: FORCE
405 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
406
407else
408ifeq ($(config-targets),1)
409# ===========================================================================
410# *config targets only - make sure prerequisites are updated, and descend
411# in scripts/kconfig to make the *config target
412
413# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
414# KBUILD_DEFCONFIG may point out an alternative default configuration
415# used for 'make defconfig'
416include $(srctree)/arch/$(ARCH)/Makefile
417export KBUILD_DEFCONFIG
418
Jan Beulichcd05e6b2005-09-06 11:47:04 +0200419config %config: scripts_basic outputmakefile FORCE
Roman Zippelc955cca2006-06-08 22:12:39 -0700420 $(Q)mkdir -p include/linux include/config
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 $(Q)$(MAKE) $(build)=scripts/kconfig $@
422
423else
424# ===========================================================================
425# Build targets only - this includes vmlinux, arch specific targets, clean
426# targets and others. In general all targets except *config targets.
427
428ifeq ($(KBUILD_EXTMOD),)
429# Additional helpers built in scripts/
430# Carefully list dependencies so we do not try to build scripts twice
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200431# in parallel
Paul Smith4f193362006-03-05 17:14:10 -0500432PHONY += scripts
Roman Zippel2e3646e2006-06-08 22:12:42 -0700433scripts: scripts_basic include/config/auto.conf
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 $(Q)$(MAKE) $(build)=$(@)
435
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436# Objects we will link into vmlinux / subdirs we need to visit
437init-y := init/
438drivers-y := drivers/ sound/
439net-y := net/
440libs-y := lib/
441core-y := usr/
442endif # KBUILD_EXTMOD
443
444ifeq ($(dot-config),1)
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200445# Read in config
446-include include/config/auto.conf
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200448ifeq ($(KBUILD_EXTMOD),)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449# Read in dependencies to all Kconfig* files, make sure to run
450# oldconfig if changes are detected.
Roman Zippelc955cca2006-06-08 22:12:39 -0700451-include include/config/auto.conf.cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453# To avoid any implicit rule to kick in, define an empty command
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700454$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455
Roman Zippelc955cca2006-06-08 22:12:39 -0700456# If .config is newer than include/config/auto.conf, someone tinkered
Sam Ravnborg752625c2005-12-26 23:34:03 +0100457# with it and forgot to run make oldconfig.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200458# if auto.conf.cmd is missing then we are probably in a cleaned tree so
Sam Ravnborg752625c2005-12-26 23:34:03 +0100459# we execute the config step to be sure to catch updated Kconfig files
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700460include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
462else
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200463# external modules needs include/linux/autoconf.h and include/config/auto.conf
464# but do not care if they are up-to-date. Use auto.conf to trigger the test
465PHONY += include/config/auto.conf
466
467include/config/auto.conf:
468 $(Q)test -e include/linux/autoconf.h -a -e $@ || ( \
469 echo; \
470 echo " ERROR: Kernel configuration is invalid."; \
471 echo " include/linux/autoconf.h or $@ are missing."; \
472 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
473 echo; \
474 /bin/false)
475
476endif # KBUILD_EXTMOD
Roman Zippelc955cca2006-06-08 22:12:39 -0700477
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478else
479# Dummy target needed, because used as prerequisite
Roman Zippelc955cca2006-06-08 22:12:39 -0700480include/config/auto.conf: ;
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200481endif # $(dot-config)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482
483# The all: target is the default when no target is given on the
484# command line.
485# This allow a user to issue only 'make' to build a kernel including modules
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200486# Defaults vmlinux but it is usually overridden in the arch makefile
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487all: vmlinux
488
489ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
490CFLAGS += -Os
491else
492CFLAGS += -O2
493endif
494
Sam Ravnborgc9eca0b2006-08-16 21:14:08 +0200495include $(srctree)/arch/$(ARCH)/Makefile
496
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497ifdef CONFIG_FRAME_POINTER
Adrian Bunkaf332aa2007-07-13 06:18:47 +0200498CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499else
500CFLAGS += -fomit-frame-pointer
501endif
502
503ifdef CONFIG_DEBUG_INFO
504CFLAGS += -g
Roland McGrathcf851aa2007-09-28 20:51:58 +0200505AFLAGS += -gdwarf-2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506endif
507
Sam Ravnborgc9eca0b2006-08-16 21:14:08 +0200508# Force gcc to behave correct even for buggy distributions
509CFLAGS += $(call cc-option, -fno-stack-protector)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510
Sam Ravnborge8e69932005-04-30 16:51:42 -0700511# arch Makefile may override CC so keep this after arch Makefile is included
Rik van Riele8f5bdb02005-05-16 21:53:46 -0700512NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
Sam Ravnborge8e69932005-04-30 16:51:42 -0700513CHECKFLAGS += $(NOSTDINC_FLAGS)
514
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515# warn about C99 declaration after statement
516CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
517
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200518# disable pointer signed / unsigned warnings in gcc 4.0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519CFLAGS += $(call cc-option,-Wno-pointer-sign,)
520
Roland McGrath18991192007-07-19 01:48:40 -0700521# Use --build-id when available.
522LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
523 $(call ld-option, -Wl$(comma)--build-id,))
524LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
525LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
526
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527# Default kernel image to build when no specific target is given.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200528# KBUILD_IMAGE may be overruled on the command line or
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529# set in the environment
530# Also any assignments in arch/$(ARCH)/Makefile take precedence over
531# this default value
532export KBUILD_IMAGE ?= vmlinux
533
534#
535# INSTALL_PATH specifies where to place the updated kernel and system map
536# images. Default is /boot, but you can set it to other values
537export INSTALL_PATH ?= /boot
538
539#
540# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
541# relocations required by build roots. This is not defined in the
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200542# makefile but the argument can be passed to make if needed.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543#
544
Sam Ravnborgdf9df032006-01-16 12:46:07 +0100545MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546export MODLIB
547
Theodore Ts'oac031f22006-06-21 20:53:09 -0400548#
549# INSTALL_MOD_STRIP, if defined, will cause modules to be
550# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
551# the default option --strip-debug will be used. Otherwise,
552# INSTALL_MOD_STRIP will used as the options to the strip command.
553
554ifdef INSTALL_MOD_STRIP
555ifeq ($(INSTALL_MOD_STRIP),1)
Andreas Schwabe3402212006-07-05 18:57:48 +0200556mod_strip_cmd = $(STRIP) --strip-debug
Theodore Ts'oac031f22006-06-21 20:53:09 -0400557else
558mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
559endif # INSTALL_MOD_STRIP=1
560else
561mod_strip_cmd = true
562endif # INSTALL_MOD_STRIP
563export mod_strip_cmd
564
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565
566ifeq ($(KBUILD_EXTMOD),)
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100567core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568
569vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
570 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
571 $(net-y) $(net-m) $(libs-y) $(libs-m)))
572
573vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
574 $(init-n) $(init-) \
575 $(core-n) $(core-) $(drivers-n) $(drivers-) \
576 $(net-n) $(net-) $(libs-n) $(libs-))))
577
578init-y := $(patsubst %/, %/built-in.o, $(init-y))
579core-y := $(patsubst %/, %/built-in.o, $(core-y))
580drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
581net-y := $(patsubst %/, %/built-in.o, $(net-y))
582libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
583libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
584libs-y := $(libs-y1) $(libs-y2)
585
586# Build vmlinux
587# ---------------------------------------------------------------------------
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200588# vmlinux is built from the objects selected by $(vmlinux-init) and
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589# $(vmlinux-main). Most are built-in.o files from top-level directories
Uwe Zeisberger24625662006-10-05 16:24:45 +0200590# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591# Ordering when linking is important, and $(vmlinux-init) must be first.
592#
593# vmlinux
594# ^
595# |
596# +-< $(vmlinux-init)
597# | +--< init/version.o + more
598# |
599# +--< $(vmlinux-main)
600# | +--< driver/built-in.o mm/built-in.o + more
601# |
602# +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
603#
604# vmlinux version (uname -v) cannot be updated during normal
605# descending-into-subdirs phase since we do not yet know if we need to
606# update vmlinux.
607# Therefore this step is delayed until just before final link of vmlinux -
608# except in the kallsyms case where it is done just before adding the
609# symbols to the kernel.
610#
611# System.map is generated to document addresses of all kernel symbols
612
613vmlinux-init := $(head-y) $(init-y)
614vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
615vmlinux-all := $(vmlinux-init) $(vmlinux-main)
Thomas Gleixner6752ed92007-10-11 11:11:36 +0200616vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
Sam Ravnborg85bd2fd2007-02-26 15:33:52 +0100617export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618
619# Rule to link vmlinux - also used during CONFIG_KALLSYMS
620# May be overridden by arch/$(ARCH)/Makefile
621quiet_cmd_vmlinux__ ?= LD $@
622 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
623 -T $(vmlinux-lds) $(vmlinux-init) \
624 --start-group $(vmlinux-main) --end-group \
Sam Ravnborg741f98f2007-07-17 10:54:06 +0200625 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626
627# Generate new vmlinux version
628quiet_cmd_vmlinux_version = GEN .version
629 cmd_vmlinux_version = set -e; \
Jan Beulich4e25d8b2005-09-08 17:07:35 +0200630 if [ ! -r .version ]; then \
631 rm -f .version; \
632 echo 1 >.version; \
633 else \
634 mv .version .old_version; \
635 expr 0$$(cat .old_version) + 1 >.version; \
636 fi; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 $(MAKE) $(build)=init
638
639# Generate System.map
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200640quiet_cmd_sysmap = SYSMAP
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
642
643# Link of vmlinux
644# If CONFIG_KALLSYMS is set .version is already updated
645# Generate System.map and verify that the content is consistent
Mark Rustad39ca3712005-10-17 16:43:34 -0700646# Use + in front of the vmlinux_version rule to silent warning with make -j2
647# First command is ':' to allow us to use + in front of the rule
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648define rule_vmlinux__
Mark Rustad39ca3712005-10-17 16:43:34 -0700649 :
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
651
652 $(call cmd,vmlinux__)
653 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
654
Sam Ravnborg46352812006-08-08 21:41:18 +0200655 $(Q)$(if $($(quiet)cmd_sysmap), \
656 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
657 $(cmd_sysmap) $@ System.map; \
658 if [ $$? -ne 0 ]; then \
659 rm -f $@; \
660 /bin/false; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 fi;
662 $(verify_kallsyms)
663endef
664
665
666ifdef CONFIG_KALLSYMS
667# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
668# It's a three stage process:
669# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
670# empty
671# Running kallsyms on that gives us .tmp_kallsyms1.o with
672# the right size - vmlinux version (uname -v) is updated during this step
673# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
674# but due to the added section, some addresses have shifted.
675# From here, we generate a correct .tmp_kallsyms2.o
676# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
677# o Verify that the System.map from vmlinux matches the map from
678# .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
679# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
680# .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
681# temporary bypass to allow the kernel to be built while the
682# maintainers work out what went wrong with kallsyms.
683
684ifdef CONFIG_KALLSYMS_EXTRA_PASS
685last_kallsyms := 3
686else
687last_kallsyms := 2
688endif
689
690kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
691
692define verify_kallsyms
Sam Ravnborg46352812006-08-08 21:41:18 +0200693 $(Q)$(if $($(quiet)cmd_sysmap), \
694 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
Sam Ravnborg46352812006-08-08 21:41:18 +0200696 $(Q)cmp -s System.map .tmp_System.map || \
697 (echo Inconsistent kallsyms data; \
698 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 rm .tmp_kallsyms* ; /bin/false )
700endef
701
702# Update vmlinux version before link
703# Use + in front of this rule to silent warning about make -j1
Sam Ravnborg72ba47c2005-07-27 11:39:37 +0200704# First command is ':' to allow us to use + in front of this rule
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705cmd_ksym_ld = $(cmd_vmlinux__)
706define rule_ksym_ld
Sam Ravnborg72ba47c2005-07-27 11:39:37 +0200707 :
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 +$(call cmd,vmlinux_version)
709 $(call cmd,vmlinux__)
710 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
711endef
712
713# Generate .S file with all kernel symbols
714quiet_cmd_kallsyms = KSYM $@
715 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
716 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
717
718.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
719 $(call if_changed_dep,as_o_S)
720
721.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
722 $(call cmd,kallsyms)
723
724# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
725.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
726 $(call if_changed_rule,ksym_ld)
727
728.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
729 $(call if_changed,vmlinux__)
730
731.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
732 $(call if_changed,vmlinux__)
733
734# Needs to visit scripts/ before $(KALLSYMS) can be used.
735$(KALLSYMS): scripts ;
736
Sam Ravnborg33bc25e2005-07-14 20:19:08 +0000737# Generate some data for debugging strange kallsyms problems
738debug_kallsyms: .tmp_map$(last_kallsyms)
739
740.tmp_map%: .tmp_vmlinux% FORCE
741 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
742
743.tmp_map3: .tmp_map2
744
745.tmp_map2: .tmp_map1
746
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747endif # ifdef CONFIG_KALLSYMS
748
Sam Ravnborg741f98f2007-07-17 10:54:06 +0200749# Do modpost on a prelinked vmlinux. The finally linked vmlinux has
750# relevant sections renamed as per the linker script.
751quiet_cmd_vmlinux-modpost = LD $@
752 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
753 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
754 $(filter-out $(vmlinux-init) $(vmlinux-main) $(vmlinux-lds) FORCE ,$^)
755define rule_vmlinux-modpost
756 :
757 +$(call cmd,vmlinux-modpost)
758 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
759 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
760endef
761
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762# vmlinux image - including updated kernel symbols
Sam Ravnborg741f98f2007-07-17 10:54:06 +0200763vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) vmlinux.o FORCE
David Woodhouse0f836e5f2006-10-11 01:21:43 -0700764ifdef CONFIG_HEADERS_CHECK
David Woodhouse0e7af8d042006-10-13 16:04:23 +0100765 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
David Woodhouse0f836e5f2006-10-11 01:21:43 -0700766endif
Sam Ravnborg741f98f2007-07-17 10:54:06 +0200767 $(call vmlinux-modpost)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 $(call if_changed_rule,vmlinux__)
Jan Beulich4e25d8b2005-09-08 17:07:35 +0200769 $(Q)rm -f .old_version
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770
Sam Ravnborg741f98f2007-07-17 10:54:06 +0200771vmlinux.o: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
772 $(call if_changed_rule,vmlinux-modpost)
773
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774# The actual objects are generated when descending,
775# make sure no implicit rule kicks in
776$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
777
778# Handle descending into subdirectories listed in $(vmlinux-dirs)
779# Preset locale variables to speed up the build process. Limit locale
780# tweaks to this spot to avoid wrong language settings when running
781# make menuconfig etc.
782# Error messages still appears in the original language
783
Paul Smith4f193362006-03-05 17:14:10 -0500784PHONY += $(vmlinux-dirs)
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200785$(vmlinux-dirs): prepare scripts
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 $(Q)$(MAKE) $(build)=$@
787
Sam Ravnborgcb584552006-01-09 21:20:34 +0100788# Build the kernel release string
Sam Ravnborgcb584552006-01-09 21:20:34 +0100789#
Robert P. J. Day1ef988562006-09-12 12:38:19 -0400790# The KERNELRELEASE value built here is stored in the file
791# include/config/kernel.release, and is used when executing several
792# make targets, such as "make install" or "make modules_install."
793#
794# The eventual kernel release string consists of the following fields,
795# shown in a hierarchical format to show how smaller parts are concatenated
796# to form the larger and final value, with values coming from places like
797# the Makefile, kernel config options, make command line options and/or
798# SCM tag information.
799#
800# $(KERNELVERSION)
801# $(VERSION) eg, 2
802# $(PATCHLEVEL) eg, 6
803# $(SUBLEVEL) eg, 18
804# $(EXTRAVERSION) eg, -rc6
805# $(localver-full)
806# $(localver)
Oleg Verych76c32952007-02-06 02:18:22 +0100807# localversion* (files without backups, containing '~')
Robert P. J. Day1ef988562006-09-12 12:38:19 -0400808# $(CONFIG_LOCALVERSION) (from kernel config setting)
809# $(localver-auto) (only if CONFIG_LOCALVERSION_AUTO is set)
810# ./scripts/setlocalversion (SCM tag, if one exists)
811# $(LOCALVERSION) (from make command line if provided)
812#
813# Note how the final $(localver-auto) string is included *only* if the
814# kernel config option CONFIG_LOCALVERSION_AUTO is selected. Also, at the
815# moment, only git is supported but other SCMs can edit the script
816# scripts/setlocalversion and add the appropriate checks as needed.
Sam Ravnborgcb584552006-01-09 21:20:34 +0100817
Oleg Verych76c32952007-02-06 02:18:22 +0100818pattern = ".*/localversion[^~]*"
819string = $(shell cat /dev/null \
Linus Torvaldsfd19e442007-02-12 15:05:15 -0800820 `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
Sam Ravnborgcb584552006-01-09 21:20:34 +0100821
Oleg Verych76c32952007-02-06 02:18:22 +0100822localver = $(subst $(space),, $(string) \
823 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200824
Sam Ravnborgcb584552006-01-09 21:20:34 +0100825# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
826# and if the SCM is know a tag from the SCM is appended.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200827# The appended tag is determined by the SCM used.
Sam Ravnborgcb584552006-01-09 21:20:34 +0100828#
829# Currently, only git is supported.
830# Other SCMs can edit scripts/setlocalversion and add the appropriate
831# checks as needed.
832ifdef CONFIG_LOCALVERSION_AUTO
833 _localver-auto = $(shell $(CONFIG_SHELL) \
834 $(srctree)/scripts/setlocalversion $(srctree))
835 localver-auto = $(LOCALVERSION)$(_localver-auto)
836endif
837
838localver-full = $(localver)$(localver-auto)
839
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700840# Store (new) KERNELRELASE string in include/config/kernel.release
Sam Ravnborg2244cbd2006-01-16 12:12:12 +0100841kernelrelease = $(KERNELVERSION)$(localver-full)
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700842include/config/kernel.release: include/config/auto.conf FORCE
Sam Ravnborg2244cbd2006-01-16 12:12:12 +0100843 $(Q)rm -f $@
844 $(Q)echo $(kernelrelease) > $@
Sam Ravnborgcb584552006-01-09 21:20:34 +0100845
846
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847# Things we need to do before we recursively start building the kernel
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200848# or the modules are listed in "prepare".
849# A multi level approach is used. prepareN is processed before prepareN-1.
850# archprepare is used in arch Makefiles and when processed asm symlink,
851# version.h and scripts_basic is processed / created.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200853# Listed in dependency order
Paul Smith4f193362006-03-05 17:14:10 -0500854PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200855
Sam Ravnborg86feeaa2005-09-09 19:28:28 +0200856# prepare3 is used to check if we are building in a separate output directory,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857# and if so do:
858# 1) Check that make has not been executed in the kernel src $(srctree)
859# 2) Create the include2 directory, used for the second asm symlink
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700860prepare3: include/config/kernel.release
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861ifneq ($(KBUILD_SRC),)
862 @echo ' Using $(srctree) as source for kernel'
Roman Zippelc955cca2006-06-08 22:12:39 -0700863 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864 echo " $(srctree) is not clean, please run 'make mrproper'";\
865 echo " in the '$(srctree)' directory.";\
866 /bin/false; \
867 fi;
868 $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
Thomas Gleixner96a388d2007-10-11 11:20:03 +0200869 $(Q)ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870endif
871
Sam Ravnborg86feeaa2005-09-09 19:28:28 +0200872# prepare2 creates a makefile if using a separate output directory
873prepare2: prepare3 outputmakefile
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874
Roman Zippel3eb3c742007-01-10 14:45:28 +0100875prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
876 include/asm include/config/auto.conf
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877ifneq ($(KBUILD_MODULES),)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878 $(Q)mkdir -p $(MODVERDIR)
Pavel Roskinfca1dff2006-04-24 15:55:27 -0400879 $(Q)rm -f $(MODVERDIR)/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880endif
881
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200882archprepare: prepare1 scripts_basic
883
884prepare0: archprepare FORCE
Sam Ravnborg8d36a622005-09-10 21:05:36 +0200885 $(Q)$(MAKE) $(build)=.
Sam Ravnborgc53aeca2007-03-27 22:50:29 +0200886 $(Q)$(MAKE) $(build)=. missing-syscalls
Sam Ravnborg86feeaa2005-09-09 19:28:28 +0200887
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888# All the preparing..
Robert P. J. Dayd395efb2007-02-14 00:33:01 -0800889prepare: prepare0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200891# Leave this as default for preprocessing vmlinux.lds.S, which is now
892# done in arch/$(ARCH)/kernel/Makefile
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893
894export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
895
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200896# FIXME: The asm symlink changes when $(ARCH) changes. That's
897# hard to detect, but I suppose "make mrproper" is a good idea
898# before switching between archs anyway.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899
900include/asm:
Thomas Gleixner96a388d2007-10-11 11:20:03 +0200901 @echo ' SYMLINK $@ -> include/asm-$(SRCARCH)'
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 $(Q)if [ ! -d include ]; then mkdir -p include; fi;
Thomas Gleixner96a388d2007-10-11 11:20:03 +0200903 @ln -fsn asm-$(SRCARCH) $@
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905# Generate some files
906# ---------------------------------------------------------------------------
907
908# KERNELRELEASE can change from a few different places, meaning version.h
909# needs to be updated, so this check is forced on all builds
910
911uts_len := 64
Sam Ravnborg63104ee2006-07-03 23:30:54 +0200912define filechk_utsrelease.h
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
Sam Ravnborg63104ee2006-07-03 23:30:54 +0200914 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
915 exit 1; \
916 fi; \
917 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918endef
919
Sam Ravnborg63104ee2006-07-03 23:30:54 +0200920define filechk_version.h
921 (echo \#define LINUX_VERSION_CODE $(shell \
922 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
923 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
924endef
925
926include/linux/version.h: $(srctree)/Makefile FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927 $(call filechk,version.h)
928
Sam Ravnborg63104ee2006-07-03 23:30:54 +0200929include/linux/utsrelease.h: include/config/kernel.release FORCE
930 $(call filechk,utsrelease.h)
931
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932# ---------------------------------------------------------------------------
933
Paul Smith4f193362006-03-05 17:14:10 -0500934PHONY += depend dep
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935depend dep:
936 @echo '*** Warning: make $@ is unnecessary now.'
937
938# ---------------------------------------------------------------------------
David Woodhouse8d730cf2006-06-18 11:58:39 +0100939# Kernel headers
David Woodhouse1ab7a1f32006-09-16 12:15:55 -0700940INSTALL_HDR_PATH=$(objtree)/usr
David Woodhouse8d730cf2006-06-18 11:58:39 +0100941export INSTALL_HDR_PATH
942
Thomas Gleixner96a388d2007-10-11 11:20:03 +0200943HDRFILTER=generic i386 x86_64
944HDRARCHES=$(filter-out $(HDRFILTER),$(patsubst $(srctree)/include/asm-%/Kbuild,%,$(wildcard $(srctree)/include/asm-*/Kbuild)))
David Woodhouse6d716272006-09-24 22:16:03 +0100945
946PHONY += headers_install_all
Roman Zippel3eb3c742007-01-10 14:45:28 +0100947headers_install_all: include/linux/version.h scripts_basic FORCE
Linus Torvalds398477d2006-09-24 14:55:52 -0700948 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
David Woodhouse6d716272006-09-24 22:16:03 +0100949 $(Q)for arch in $(HDRARCHES); do \
Linus Torvalds398477d2006-09-24 14:55:52 -0700950 $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch ;\
David Woodhouse6d716272006-09-24 22:16:03 +0100951 done
952
David Woodhouse8d730cf2006-06-18 11:58:39 +0100953PHONY += headers_install
Roman Zippel3eb3c742007-01-10 14:45:28 +0100954headers_install: include/linux/version.h scripts_basic FORCE
Thomas Gleixner96a388d2007-10-11 11:20:03 +0200955 @if [ ! -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
956 echo '*** Error: Headers not exportable for this architecture ($(SRCARCH))'; \
David Woodhousef17b7ba2006-09-21 09:01:45 +0100957 exit 1 ; fi
Sam Ravnborg07aea3a2006-07-23 20:47:50 +0200958 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
Thomas Gleixner96a388d2007-10-11 11:20:03 +0200959 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include
David Woodhouse8d730cf2006-06-18 11:58:39 +0100960
Mike Frysinger1f857122007-02-14 00:33:02 -0800961PHONY += headers_check_all
962headers_check_all: headers_install_all
963 $(Q)for arch in $(HDRARCHES); do \
964 $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch HDRCHECK=1 ;\
965 done
966
David Woodhouse68475352006-06-18 12:02:10 +0100967PHONY += headers_check
968headers_check: headers_install
Thomas Gleixner96a388d2007-10-11 11:20:03 +0200969 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include HDRCHECK=1
David Woodhouse68475352006-06-18 12:02:10 +0100970
David Woodhouse8d730cf2006-06-18 11:58:39 +0100971# ---------------------------------------------------------------------------
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972# Modules
973
974ifdef CONFIG_MODULES
975
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200976# By default, build modules as well
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977
978all: modules
979
980# Build modules
981
Paul Smith4f193362006-03-05 17:14:10 -0500982PHONY += modules
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
984 @echo ' Building modules, stage 2.';
Sam Ravnborgb805aa02006-08-08 21:36:08 +0200985 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986
987
988# Target to prepare building external modules
Paul Smith4f193362006-03-05 17:14:10 -0500989PHONY += modules_prepare
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200990modules_prepare: prepare scripts
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991
992# Target to install modules
Paul Smith4f193362006-03-05 17:14:10 -0500993PHONY += modules_install
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994modules_install: _modinst_ _modinst_post
995
Paul Smith4f193362006-03-05 17:14:10 -0500996PHONY += _modinst_
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997_modinst_:
Tom Rinice454d42005-07-15 07:56:36 -0700998 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999 echo "Warning: you may need to install module-init-tools"; \
1000 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1001 sleep 1; \
1002 fi
1003 @rm -rf $(MODLIB)/kernel
1004 @rm -f $(MODLIB)/source
1005 @mkdir -p $(MODLIB)/kernel
1006 @ln -s $(srctree) $(MODLIB)/source
1007 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1008 rm -f $(MODLIB)/build ; \
1009 ln -s $(objtree) $(MODLIB)/build ; \
1010 fi
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001011 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012
1013# If System.map exists, run depmod. This deliberately does not have a
1014# dependency on System.map since that would run the dependency tree on
1015# vmlinux. This depmod is only for convenience to give the initial
1016# boot a modules.dep even before / is mounted read-write. However the
1017# boot script depmod is the master version.
1018ifeq "$(strip $(INSTALL_MOD_PATH))" ""
1019depmod_opts :=
1020else
1021depmod_opts := -b $(INSTALL_MOD_PATH) -r
1022endif
Paul Smith4f193362006-03-05 17:14:10 -05001023PHONY += _modinst_post
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024_modinst_post: _modinst_
1025 if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
1026
1027else # CONFIG_MODULES
1028
1029# Modules not configured
1030# ---------------------------------------------------------------------------
1031
1032modules modules_install: FORCE
1033 @echo
1034 @echo "The present kernel configuration has modules disabled."
1035 @echo "Type 'make config' and enable loadable module support."
1036 @echo "Then build a kernel with module support enabled."
1037 @echo
1038 @exit 1
1039
1040endif # CONFIG_MODULES
1041
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042###
1043# Cleaning is done on three levels.
1044# make clean Delete most generated files
1045# Leave enough to build external modules
1046# make mrproper Delete the current configuration, and all generated files
1047# make distclean Remove editor backup files, patch leftover files and the like
1048
1049# Directories & files removed with 'make clean'
1050CLEAN_DIRS += $(MODVERDIR)
1051CLEAN_FILES += vmlinux System.map \
1052 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1053
1054# Directories & files removed with 'make mrproper'
David Woodhouse1ab7a1f32006-09-16 12:15:55 -07001055MRPROPER_DIRS += include/config include2 usr/include
Tore Anderson50aa88e2006-01-07 15:34:40 +01001056MRPROPER_FILES += .config .config.old include/asm .version .old_version \
Roman Zippel3eb3c742007-01-10 14:45:28 +01001057 include/linux/autoconf.h include/linux/version.h \
1058 include/linux/utsrelease.h \
Roman Zippelf1d28fb2006-06-08 22:12:43 -07001059 Module.symvers tags TAGS cscope*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060
1061# clean - Delete most, but leave enough to build external modules
1062#
1063clean: rm-dirs := $(CLEAN_DIRS)
1064clean: rm-files := $(CLEAN_FILES)
Sam Ravnborg86feeaa2005-09-09 19:28:28 +02001065clean-dirs := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066
Paul Smith4f193362006-03-05 17:14:10 -05001067PHONY += $(clean-dirs) clean archclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068$(clean-dirs):
1069 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1070
1071clean: archclean $(clean-dirs)
1072 $(call cmd,rmdirs)
1073 $(call cmd,rmfiles)
1074 @find . $(RCS_FIND_IGNORE) \
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001075 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
Andreas Gruenbacher15fde672006-05-09 20:37:30 +02001076 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1077 -o -name '*.symtypes' \) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078 -type f -print | xargs rm -f
1079
1080# mrproper - Delete all generated files, including .config
1081#
1082mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1083mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1084mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1085
Paul Smith4f193362006-03-05 17:14:10 -05001086PHONY += $(mrproper-dirs) mrproper archmrproper
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087$(mrproper-dirs):
1088 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1089
1090mrproper: clean archmrproper $(mrproper-dirs)
1091 $(call cmd,rmdirs)
1092 $(call cmd,rmfiles)
1093
1094# distclean
1095#
Paul Smith4f193362006-03-05 17:14:10 -05001096PHONY += distclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097
1098distclean: mrproper
1099 @find $(srctree) $(RCS_FIND_IGNORE) \
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001100 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001102 -o -name '.*.rej' -o -size 0 \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1104 -type f -print | xargs rm -f
1105
1106
1107# Packaging of the kernel to various formats
1108# ---------------------------------------------------------------------------
1109# rpm target kept for backward compatibility
1110package-dir := $(srctree)/scripts/package
1111
Zach Brown031ecc62006-06-08 22:12:37 -07001112%pkg: include/config/kernel.release FORCE
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001113 $(Q)$(MAKE) $(build)=$(package-dir) $@
Zach Brown031ecc62006-06-08 22:12:37 -07001114rpm: include/config/kernel.release FORCE
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001115 $(Q)$(MAKE) $(build)=$(package-dir) $@
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116
1117
1118# Brief documentation of the typical targets used
1119# ---------------------------------------------------------------------------
1120
1121boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1122boards := $(notdir $(boards))
1123
1124help:
1125 @echo 'Cleaning targets:'
Samuel Tardieu5ea084e2006-12-12 19:09:40 +01001126 @echo ' clean - Remove most generated files but keep the config and'
Jesper Juhl5cc8d242006-09-24 14:01:08 +02001127 @echo ' enough build support to build external modules'
Samuel Tardieu5ea084e2006-12-12 19:09:40 +01001128 @echo ' mrproper - Remove all generated files + config + various backup files'
Jesper Juhl5cc8d242006-09-24 14:01:08 +02001129 @echo ' distclean - mrproper + remove editor backup and patch files'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130 @echo ''
1131 @echo 'Configuration targets:'
1132 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1133 @echo ''
1134 @echo 'Other generic targets:'
1135 @echo ' all - Build all targets marked with [*]'
1136 @echo '* vmlinux - Build the bare kernel'
1137 @echo '* modules - Build all modules'
Bodo Eggert9cc5d742005-11-23 20:11:34 +01001138 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139 @echo ' dir/ - Build all files in dir and below'
1140 @echo ' dir/file.[ois] - Build specified target only'
Sam Ravnborg155ad602005-07-07 17:56:08 -07001141 @echo ' dir/file.ko - Build module including final link'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142 @echo ' rpm - Build a kernel as an RPM package'
1143 @echo ' tags/TAGS - Generate tags file for editors'
1144 @echo ' cscope - Generate cscope index'
Zach Brown6d128842005-09-07 12:08:23 -07001145 @echo ' kernelrelease - Output the release version string'
Sam Ravnborgcb584552006-01-09 21:20:34 +01001146 @echo ' kernelversion - Output the version stored in Makefile'
Thomas Gleixner91e034e2007-10-11 17:53:52 +02001147 @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
David Woodhousef17b7ba2006-09-21 09:01:45 +01001148 echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
Geert Uytterhoeven59df3232007-01-29 13:47:01 +01001149 echo ' (default: $(INSTALL_HDR_PATH))'; \
David Woodhousef17b7ba2006-09-21 09:01:45 +01001150 fi
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151 @echo ''
1152 @echo 'Static analysers'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153 @echo ' checkstack - Generate a list of stack hogs'
1154 @echo ' namespacecheck - Name space analysis on compiled kernel'
Thomas Gleixner91e034e2007-10-11 17:53:52 +02001155 @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
David Woodhousef17b7ba2006-09-21 09:01:45 +01001156 echo ' headers_check - Sanity check on exported headers'; \
1157 fi
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158 @echo ''
1159 @echo 'Kernel packaging:'
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001160 @$(MAKE) $(build)=$(package-dir) help
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161 @echo ''
1162 @echo 'Documentation targets:'
1163 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1164 @echo ''
1165 @echo 'Architecture specific targets ($(ARCH)):'
1166 @$(if $(archhelp),$(archhelp),\
1167 echo ' No architecture specific help defined for $(ARCH)')
1168 @echo ''
1169 @$(if $(boards), \
1170 $(foreach b, $(boards), \
1171 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1172 echo '')
1173
1174 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
Sam Ravnborg45d506b2006-08-08 21:35:14 +02001175 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
Dustin Kirkland701842e2006-05-23 15:57:23 -05001177 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1178 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 @echo ''
1180 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1181 @echo 'For further info see the ./README file'
1182
1183
1184# Documentation targets
1185# ---------------------------------------------------------------------------
1186%docs: scripts_basic FORCE
1187 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1188
1189else # KBUILD_EXTMOD
1190
1191###
1192# External module support.
1193# When building external modules the kernel used as basis is considered
1194# read-only, and no consistency checks are made and the make
1195# system is not used on the basis kernel. If updates are required
1196# in the basis kernel ordinary make commands (without M=...) must
1197# be used.
1198#
1199# The following are the only valid targets when building external
1200# modules.
1201# make M=dir clean Delete all automatically generated files
1202# make M=dir modules Make all modules in specified dir
1203# make M=dir Same as 'make M=dir modules'
1204# make M=dir modules_install
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001205# Install the modules built in the module directory
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206# Assumes install directory is already created
1207
1208# We are always building modules
1209KBUILD_MODULES := 1
Paul Smith4f193362006-03-05 17:14:10 -05001210PHONY += crmodverdir
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211crmodverdir:
1212 $(Q)mkdir -p $(MODVERDIR)
Pavel Roskinfca1dff2006-04-24 15:55:27 -04001213 $(Q)rm -f $(MODVERDIR)/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214
Paul Smith4f193362006-03-05 17:14:10 -05001215PHONY += $(objtree)/Module.symvers
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216$(objtree)/Module.symvers:
1217 @test -e $(objtree)/Module.symvers || ( \
1218 echo; \
1219 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1220 echo " is missing; modules will have no dependencies and modversions."; \
1221 echo )
1222
1223module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
Paul Smith4f193362006-03-05 17:14:10 -05001224PHONY += $(module-dirs) modules
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225$(module-dirs): crmodverdir $(objtree)/Module.symvers
1226 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1227
1228modules: $(module-dirs)
1229 @echo ' Building modules, stage 2.';
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001230 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231
Paul Smith4f193362006-03-05 17:14:10 -05001232PHONY += modules_install
Sam Ravnborga67dc212006-01-28 23:51:57 +01001233modules_install: _emodinst_ _emodinst_post
Adrian Bunke6304662006-02-14 15:58:15 +01001234
Paul Smith4f193362006-03-05 17:14:10 -05001235install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1236PHONY += _emodinst_
Sam Ravnborga67dc212006-01-28 23:51:57 +01001237_emodinst_:
Sam Ravnborga67dc212006-01-28 23:51:57 +01001238 $(Q)mkdir -p $(MODLIB)/$(install-dir)
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001239 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240
Sam Ravnborga67dc212006-01-28 23:51:57 +01001241# Run depmod only is we have System.map and depmod is executable
1242quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1243 cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \
1244 $(DEPMOD) -ae -F System.map \
1245 $(if $(strip $(INSTALL_MOD_PATH)), \
1246 -b $(INSTALL_MOD_PATH) -r) \
1247 $(KERNELRELEASE); \
1248 fi
1249
Paul Smith4f193362006-03-05 17:14:10 -05001250PHONY += _emodinst_post
Sam Ravnborga67dc212006-01-28 23:51:57 +01001251_emodinst_post: _emodinst_
1252 $(call cmd,depmod)
1253
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1255
Paul Smith4f193362006-03-05 17:14:10 -05001256PHONY += $(clean-dirs) clean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001257$(clean-dirs):
1258 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1259
1260clean: rm-dirs := $(MODVERDIR)
Mike Frysingerc34114f2007-07-31 19:45:34 -04001261clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262clean: $(clean-dirs)
1263 $(call cmd,rmdirs)
Mike Frysingerc34114f2007-07-31 19:45:34 -04001264 $(call cmd,rmfiles)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001265 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001266 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1268 -type f -print | xargs rm -f
1269
1270help:
1271 @echo ' Building external modules.'
1272 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1273 @echo ''
1274 @echo ' modules - default target, build the module(s)'
1275 @echo ' modules_install - install the module'
1276 @echo ' clean - remove generated files in module directory only'
1277 @echo ''
Sam Ravnborg06300b22006-01-25 07:13:18 +01001278
1279# Dummies...
Paul Smith4f193362006-03-05 17:14:10 -05001280PHONY += prepare scripts
Sam Ravnborg06300b22006-01-25 07:13:18 +01001281prepare: ;
1282scripts: ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283endif # KBUILD_EXTMOD
1284
1285# Generate tags for editors
1286# ---------------------------------------------------------------------------
1287
1288#We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1289#(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1290#Adding $(srctree) adds about 20M on i386 to the size of the output file!
1291
George Anzingerf182ae62005-07-07 17:56:06 -07001292ifeq ($(src),$(obj))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001293__srctree =
1294else
1295__srctree = $(srctree)/
1296endif
1297
Paolo 'Blaisorblade' Giarrusso2ab23c92005-11-13 16:07:00 -08001298ifeq ($(ALLSOURCE_ARCHS),)
1299ifeq ($(ARCH),um)
1300ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1301else
Thomas Gleixner2eb4c952007-10-11 11:11:38 +02001302ALLINCLUDE_ARCHS := $(SRCARCH)
Paolo 'Blaisorblade' Giarrusso2ab23c92005-11-13 16:07:00 -08001303endif
1304else
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001305#Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behavour.
Paolo 'Blaisorblade' Giarrusso2ab23c92005-11-13 16:07:00 -08001306ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1307endif
1308
Thomas Gleixner2eb4c952007-10-11 11:11:38 +02001309# Take care of arch/x86
1310ifeq ($(ARCH), $(SRCARCH))
Ian Campbella0674e82005-06-23 11:25:54 +01001311ALLSOURCE_ARCHS := $(ARCH)
Thomas Gleixner2eb4c952007-10-11 11:11:38 +02001312else
1313ALLSOURCE_ARCHS := $(ARCH) $(SRCARCH)
1314endif
Ian Campbella0674e82005-06-23 11:25:54 +01001315
Masatake YAMATOe838db62006-06-22 12:21:20 +09001316define find-sources
Don Mullisdd7e54a2007-01-04 10:14:52 -08001317 ( for ARCH in $(ALLSOURCE_ARCHS) ; do \
Thomas Gleixner2eb4c952007-10-11 11:11:38 +02001318 find $(__srctree)arch/$${SRCARCH} $(RCS_FIND_IGNORE) \
Masatake YAMATOe838db62006-06-22 12:21:20 +09001319 -name $1 -print; \
Ian Campbella0674e82005-06-23 11:25:54 +01001320 done ; \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321 find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
Masatake YAMATOe838db62006-06-22 12:21:20 +09001322 -name $1 -print; \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323 find $(__srctree)include $(RCS_FIND_IGNORE) \
1324 \( -name config -o -name 'asm-*' \) -prune \
Masatake YAMATOe838db62006-06-22 12:21:20 +09001325 -o -name $1 -print; \
Paolo 'Blaisorblade' Giarrusso2ab23c92005-11-13 16:07:00 -08001326 for ARCH in $(ALLINCLUDE_ARCHS) ; do \
Thomas Gleixner2eb4c952007-10-11 11:11:38 +02001327 find $(__srctree)include/asm-$${SRCARCH} $(RCS_FIND_IGNORE) \
Masatake YAMATOe838db62006-06-22 12:21:20 +09001328 -name $1 -print; \
Ian Campbella0674e82005-06-23 11:25:54 +01001329 done ; \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330 find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
Don Mullisdd7e54a2007-01-04 10:14:52 -08001331 -name $1 -print; \
1332 find $(__srctree) $(RCS_FIND_IGNORE) \
1333 \( -name include -o -name arch \) -prune -o \
1334 -name $1 -print; \
1335 )
Masatake YAMATOe838db62006-06-22 12:21:20 +09001336endef
1337
1338define all-sources
1339 $(call find-sources,'*.[chS]')
1340endef
1341define all-kconfigs
1342 $(call find-sources,'Kconfig*')
1343endef
1344define all-defconfigs
1345 $(call find-sources,'defconfig')
Linus Torvalds1da177e2005-04-16 15:20:36 -07001346endef
1347
Aron Griffisda7c0402006-09-21 00:27:02 -04001348define xtags
1349 if $1 --version 2>&1 | grep -iq exuberant; then \
1350 $(all-sources) | xargs $1 -a \
1351 -I __initdata,__exitdata,__acquires,__releases \
1352 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
Aneesh Kumar K.V91b943e2006-10-17 00:10:32 -07001353 --extra=+f --c-kinds=+px \
Aneesh Kumar K.Va412c172007-07-09 11:43:57 -07001354 --regex-asm='/^ENTRY\(([^)]*)\).*/\1/'; \
Aron Griffisda7c0402006-09-21 00:27:02 -04001355 $(all-kconfigs) | xargs $1 -a \
1356 --langdef=kconfig \
1357 --language-force=kconfig \
1358 --regex-kconfig='/^[[:blank:]]*config[[:blank:]]+([[:alnum:]_]+)/\1/'; \
David Gibson18e39912006-10-04 02:15:32 -07001359 $(all-defconfigs) | xargs -r $1 -a \
Aron Griffisda7c0402006-09-21 00:27:02 -04001360 --langdef=dotconfig \
1361 --language-force=dotconfig \
1362 --regex-dotconfig='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'; \
1363 elif $1 --version 2>&1 | grep -iq emacs; then \
1364 $(all-sources) | xargs $1 -a; \
1365 $(all-kconfigs) | xargs $1 -a \
1366 --regex='/^[ \t]*config[ \t]+\([a-zA-Z0-9_]+\)/\1/'; \
David Gibson18e39912006-10-04 02:15:32 -07001367 $(all-defconfigs) | xargs -r $1 -a \
Aron Griffisda7c0402006-09-21 00:27:02 -04001368 --regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'; \
1369 else \
1370 $(all-sources) | xargs $1 -a; \
1371 fi
1372endef
1373
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374quiet_cmd_cscope-file = FILELST cscope.files
Karl Hegbloomacbef452005-06-19 00:50:47 -07001375 cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376
1377quiet_cmd_cscope = MAKE cscope.out
Karl Hegbloomacbef452005-06-19 00:50:47 -07001378 cmd_cscope = cscope -b
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379
1380cscope: FORCE
1381 $(call cmd,cscope-file)
1382 $(call cmd,cscope)
1383
1384quiet_cmd_TAGS = MAKE $@
Sam Ravnborg66d609e2005-07-28 23:11:34 +02001385define cmd_TAGS
1386 rm -f $@; \
Aron Griffisda7c0402006-09-21 00:27:02 -04001387 $(call xtags,etags)
Sam Ravnborg66d609e2005-07-28 23:11:34 +02001388endef
Linus Torvalds1da177e2005-04-16 15:20:36 -07001389
Sam Ravnborg66d609e2005-07-28 23:11:34 +02001390TAGS: FORCE
1391 $(call cmd,TAGS)
1392
Linus Torvalds1da177e2005-04-16 15:20:36 -07001393quiet_cmd_tags = MAKE $@
1394define cmd_tags
1395 rm -f $@; \
Aron Griffisda7c0402006-09-21 00:27:02 -04001396 $(call xtags,ctags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001397endef
1398
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399tags: FORCE
1400 $(call cmd,tags)
1401
1402
1403# Scripts to check various things for consistency
1404# ---------------------------------------------------------------------------
1405
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406includecheck:
1407 find * $(RCS_FIND_IGNORE) \
1408 -name '*.[hcS]' -type f -print | sort \
1409 | xargs $(PERL) -w scripts/checkincludes.pl
1410
1411versioncheck:
1412 find * $(RCS_FIND_IGNORE) \
1413 -name '*.[hcS]' -type f -print | sort \
1414 | xargs $(PERL) -w scripts/checkversion.pl
1415
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416namespacecheck:
1417 $(PERL) $(srctree)/scripts/namespace.pl
1418
1419endif #ifeq ($(config-targets),1)
1420endif #ifeq ($(mixed-targets),1)
1421
Roman Zippelc30a02e2006-06-08 22:12:50 -07001422PHONY += checkstack kernelrelease kernelversion
Jeff Dikee3ccf6e2006-09-27 01:50:37 -07001423
Jeff Dike011e3a92006-12-13 00:34:12 -08001424# UML needs a little special treatment here. It wants to use the host
1425# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1426# else wants $(ARCH), including people doing cross-builds, which means
1427# that $(SUBARCH) doesn't work here.
1428ifeq ($(ARCH), um)
1429CHECKSTACK_ARCH := $(SUBARCH)
1430else
1431CHECKSTACK_ARCH := $(ARCH)
1432endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433checkstack:
1434 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
Jeff Dike011e3a92006-12-13 00:34:12 -08001435 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436
1437kernelrelease:
Roman Zippelf1d28fb2006-06-08 22:12:43 -07001438 $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1439 $(error kernelrelease not valid - run 'make prepare' to update it))
Sam Ravnborgcb584552006-01-09 21:20:34 +01001440kernelversion:
Sam Ravnborg2244cbd2006-01-16 12:12:12 +01001441 @echo $(KERNELVERSION)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442
Sam Ravnborg06300b22006-01-25 07:13:18 +01001443# Single targets
1444# ---------------------------------------------------------------------------
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001445# Single targets are compatible with:
1446# - build whith mixed source and output
1447# - build with separate output dir 'make O=...'
1448# - external modules
1449#
1450# target-dir => where to store outputfile
1451# build-dir => directory in kernel source tree to use
Sam Ravnborg06300b22006-01-25 07:13:18 +01001452
Sam Ravnborg06300b22006-01-25 07:13:18 +01001453ifeq ($(KBUILD_EXTMOD),)
Sam Ravnborgaa360872006-04-06 08:25:31 +02001454 build-dir = $(patsubst %/,%,$(dir $@))
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001455 target-dir = $(dir $@)
Sam Ravnborg06300b22006-01-25 07:13:18 +01001456else
1457 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001458 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1459 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
Sam Ravnborg06300b22006-01-25 07:13:18 +01001460endif
1461
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001462%.s: %.c prepare scripts FORCE
1463 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1464%.i: %.c prepare scripts FORCE
1465 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1466%.o: %.c prepare scripts FORCE
1467 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1468%.lst: %.c prepare scripts FORCE
1469 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1470%.s: %.S prepare scripts FORCE
1471 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1472%.o: %.S prepare scripts FORCE
1473 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
Andreas Gruenbacher15fde672006-05-09 20:37:30 +02001474%.symtypes: %.c prepare scripts FORCE
1475 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001476
1477# Modules
1478/ %/: prepare scripts FORCE
Sam Ravnborg06300b22006-01-25 07:13:18 +01001479 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001480 $(build)=$(build-dir)
1481%.ko: prepare scripts FORCE
Sam Ravnborg06300b22006-01-25 07:13:18 +01001482 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001483 $(build)=$(build-dir) $(@:.ko=.o)
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001484 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
Sam Ravnborg06300b22006-01-25 07:13:18 +01001485
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486# FIXME Should go into a make.lib or something
1487# ===========================================================================
1488
1489quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1490 cmd_rmdirs = rm -rf $(rm-dirs)
1491
1492quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1493 cmd_rmfiles = rm -f $(rm-files)
1494
1495
1496a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1497 $(NOSTDINC_FLAGS) $(CPPFLAGS) \
Sam Ravnborg5e8d7802006-07-01 09:58:02 +02001498 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001499
1500quiet_cmd_as_o_S = AS $@
1501cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1502
1503# read all saved command lines
1504
1505targets := $(wildcard $(sort $(targets)))
1506cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1507
1508ifneq ($(cmd_files),)
1509 $(cmd_files): ; # Do not try to update included dependency files
1510 include $(cmd_files)
1511endif
1512
Linus Torvalds1da177e2005-04-16 15:20:36 -07001513# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1514# Usage:
1515# $(Q)$(MAKE) $(clean)=dir
1516clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1517
Linus Torvalds1da177e2005-04-16 15:20:36 -07001518endif # skip-makefile
1519
Paul Smith4f193362006-03-05 17:14:10 -05001520PHONY += FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521FORCE:
Paul Smith4f193362006-03-05 17:14:10 -05001522
Oleg Verych15964862006-12-10 02:18:40 -08001523# Cancel implicit rules on top Makefile, `-rR' will apply to sub-makes.
1524Makefile: ;
Paul Smith4f193362006-03-05 17:14:10 -05001525
1526# Declare the contents of the .PHONY variable as phony. We keep that
1527# information in a variable se we can use it in if_changed and friends.
1528.PHONY: $(PHONY)