blob: 077f5abf22ff0d0871fb958983ec8e9450a92b45 [file] [log] [blame]
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001VERSION = 1
2PATCHLEVEL = 2
3SUBLEVEL = 1
4EXTRAVERSION = .svn
Denis Vlasenkoda8f43f2006-10-09 19:47:38 +00005NAME = Unnamed
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00006
7# *DOCUMENTATION*
8# To see a list of typical targets execute "make help"
9# More info can be located in ./README
10# Comments in this file are targeted only to the developer, do not
11# expect to learn how to build the kernel reading this file.
12
13# Do not print "Entering directory ..."
14MAKEFLAGS += --no-print-directory
15
16# We are using a recursive build, so we need to do a little thinking
17# to get the ordering right.
Eric Andersenc4996011999-10-20 22:08:37 +000018#
Denis Vlasenko7d219aa2006-10-05 10:17:08 +000019# Most importantly: sub-Makefiles should only ever modify files in
20# their own directory. If in some directory we have a dependency on
21# a file in another dir (which doesn't happen often, but it's often
22# unavoidable when linking the built-in.o targets which finally
23# turn into busybox), we will call a sub make in that other dir, and
24# after that we are sure that everything which is in that other dir
25# is now up to date.
Erik Andersen9ffdaa62000-02-11 21:55:04 +000026#
Denis Vlasenko7d219aa2006-10-05 10:17:08 +000027# The only cases where we need to modify files which have global
28# effects are thus separated out and done before the recursive
29# descending is started. They are now explicitly listed as the
30# prepare rule.
Eric Andersenc4996011999-10-20 22:08:37 +000031
Denis Vlasenko7d219aa2006-10-05 10:17:08 +000032# To put more focus on warnings, be less verbose as default
33# Use 'make V=1' to see the full commands
Rob Landleyd9872aa2006-05-27 21:24:16 +000034
Bernhard Reutner-Fischer7b8ff222006-06-13 14:20:17 +000035ifdef V
36 ifeq ("$(origin V)", "command line")
Denis Vlasenko7d219aa2006-10-05 10:17:08 +000037 KBUILD_VERBOSE = $(V)
Bernhard Reutner-Fischer7b8ff222006-06-13 14:20:17 +000038 endif
39endif
Denis Vlasenko7d219aa2006-10-05 10:17:08 +000040ifndef KBUILD_VERBOSE
41 KBUILD_VERBOSE = 0
42endif
43
44# Call sparse as part of compilation of C files
45# Use 'make C=1' to enable sparse checking
46
47ifdef C
48 ifeq ("$(origin C)", "command line")
49 KBUILD_CHECKSRC = $(C)
50 endif
51endif
52ifndef KBUILD_CHECKSRC
53 KBUILD_CHECKSRC = 0
54endif
55
56# Use make M=dir to specify directory of external module to build
57# Old syntax make ... SUBDIRS=$PWD is still supported
58# Setting the environment variable KBUILD_EXTMOD take precedence
59ifdef SUBDIRS
60 KBUILD_EXTMOD ?= $(SUBDIRS)
61endif
62ifdef M
63 ifeq ("$(origin M)", "command line")
64 KBUILD_EXTMOD := $(M)
Bernhard Reutner-Fischer7b8ff222006-06-13 14:20:17 +000065 endif
66endif
67
Denis Vlasenko7d219aa2006-10-05 10:17:08 +000068
69# kbuild supports saving output files in a separate directory.
70# To locate output files in a separate directory two syntaxes are supported.
71# In both cases the working directory must be the root of the kernel src.
72# 1) O=
73# Use "make O=dir/to/store/output/files/"
74#
75# 2) Set KBUILD_OUTPUT
76# Set the environment variable KBUILD_OUTPUT to point to the directory
77# where the output files shall be placed.
78# export KBUILD_OUTPUT=dir/to/store/output/files/
79# make
80#
81# The O= assignment takes precedence over the KBUILD_OUTPUT environment
82# variable.
83
84
85# KBUILD_SRC is set on invocation of make in OBJ directory
86# KBUILD_SRC is not intended to be used by the regular user (for now)
87ifeq ($(KBUILD_SRC),)
88
89# OK, Make called in directory where kernel src resides
90# Do we want to locate output files in a separate directory?
91ifdef O
92 ifeq ("$(origin O)", "command line")
93 KBUILD_OUTPUT := $(O)
94 endif
Eric Andersen7daa0762004-10-08 07:46:08 +000095endif
96
Denis Vlasenko7d219aa2006-10-05 10:17:08 +000097# That's our default target when none is given on the command line
98PHONY := _all
99_all:
Bernhard Reutner-Fischer5d261262006-03-01 22:54:48 +0000100
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000101ifneq ($(KBUILD_OUTPUT),)
Bernhard Reutner-Fischerdf100942006-03-13 19:04:00 +0000102# Invoke a second make in the output directory, passing relevant variables
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000103# check that the output directory actually exists
104saved-output := $(KBUILD_OUTPUT)
105KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
106$(if $(KBUILD_OUTPUT),, \
Eric Andersen7daa0762004-10-08 07:46:08 +0000107 $(error output directory "$(saved-output)" does not exist))
108
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000109PHONY += $(MAKECMDGOALS)
Eric Andersen7daa0762004-10-08 07:46:08 +0000110
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000111$(filter-out _all,$(MAKECMDGOALS)) _all:
112 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
113 KBUILD_SRC=$(CURDIR) \
114 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile $@
Eric Andersen7daa0762004-10-08 07:46:08 +0000115
Bernhard Reutner-Fischerdf100942006-03-13 19:04:00 +0000116# Leave processing to above invocation of make
117skip-makefile := 1
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000118endif # ifneq ($(KBUILD_OUTPUT),)
119endif # ifeq ($(KBUILD_SRC),)
Eric Andersen7daa0762004-10-08 07:46:08 +0000120
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000121# We process the rest of the Makefile if this is the final invocation of make
Bernhard Reutner-Fischerdf100942006-03-13 19:04:00 +0000122ifeq ($(skip-makefile),)
Eric Andersen7daa0762004-10-08 07:46:08 +0000123
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000124# If building an external module we do not care about the all: rule
125# but instead _all depend on modules
126PHONY += all
127ifeq ($(KBUILD_EXTMOD),)
Bernhard Reutner-Fischerdf100942006-03-13 19:04:00 +0000128_all: all
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000129else
130_all: modules
131endif
Glenn L McGrath6376b582003-09-24 15:48:29 +0000132
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000133srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
134TOPDIR := $(srctree)
135# FIXME - TOPDIR is obsolete, use srctree/objtree
136objtree := $(CURDIR)
137src := $(srctree)
138obj := $(objtree)
139
140VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
141
142export srctree objtree VPATH TOPDIR
Bernhard Reutner-Fischer4d635252005-10-07 10:53:15 +0000143
Bernhard Reutner-Fischerdf100942006-03-13 19:04:00 +0000144
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000145# SUBARCH tells the usermode build what the underlying arch is. That is set
146# first, and if a usermode build is happening, the "ARCH=um" on the command
147# line overrides the setting of ARCH below. If a native build is happening,
148# then ARCH is assigned, getting whatever value it gets normally, and
149# SUBARCH is subsequently ignored.
Bernhard Reutner-Fischer07a79e72006-03-09 09:03:37 +0000150
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000151SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
152 -e s/arm.*/arm/ -e s/sa110/arm/ \
153 -e s/s390x/s390/ -e s/parisc64/parisc/ \
154 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ )
Bernhard Reutner-Fischer5c071bc2005-10-05 07:40:46 +0000155
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000156# Cross compiling and selecting different set of gcc/bin-utils
Bernhard Reutner-Fischer5c071bc2005-10-05 07:40:46 +0000157# ---------------------------------------------------------------------------
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000158#
159# When performing cross compilation for other architectures ARCH shall be set
160# to the target architecture. (See arch/* for the possibilities).
161# ARCH can be set during invocation of make:
162# make ARCH=ia64
163# Another way is to have ARCH set in the environment.
164# The default ARCH is the host where make is executed.
Bernhard Reutner-Fischer5c071bc2005-10-05 07:40:46 +0000165
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000166# CROSS_COMPILE specify the prefix used for all executables used
167# during compilation. Only gcc and related bin-utils executables
168# are prefixed with $(CROSS_COMPILE).
169# CROSS_COMPILE can be set on the command line
170# make CROSS_COMPILE=ia64-linux-
171# Alternatively CROSS_COMPILE can be set in the environment.
172# Default value for CROSS_COMPILE is not to prefix executables
173# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
Bernhard Reutner-Fischer5c071bc2005-10-05 07:40:46 +0000174
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000175ARCH ?= $(SUBARCH)
176CROSS_COMPILE ?=
Bernhard Reutner-Fischer5c071bc2005-10-05 07:40:46 +0000177
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000178# Architecture as present in compile.h
179UTS_MACHINE := $(ARCH)
Bernhard Reutner-Fischer5c071bc2005-10-05 07:40:46 +0000180
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000181# SHELL used by kbuild
182CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
183 else if [ -x /bin/bash ]; then echo /bin/bash; \
184 else echo sh; fi ; fi)
Bernhard Reutner-Fischer5c071bc2005-10-05 07:40:46 +0000185
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000186HOSTCC = gcc
187HOSTCXX = g++
188HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
189HOSTCXXFLAGS = -O2
Bernhard Reutner-Fischer5c071bc2005-10-05 07:40:46 +0000190
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000191# Decide whether to build built-in, modular, or both.
192# Normally, just do built-in.
Bernhard Reutner-Fischer5c071bc2005-10-05 07:40:46 +0000193
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000194KBUILD_MODULES :=
195KBUILD_BUILTIN := 1
Bernhard Reutner-Fischer5c071bc2005-10-05 07:40:46 +0000196
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000197# If we have only "make modules", don't compile built-in objects.
198# When we're building modules with modversions, we need to consider
199# the built-in objects during the descend as well, in order to
200# make sure the checksums are uptodate before we record them.
Bernhard Reutner-Fischer5c071bc2005-10-05 07:40:46 +0000201
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000202ifeq ($(MAKECMDGOALS),modules)
203 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
204endif
Rob Landleya167ec52006-01-31 02:42:50 +0000205
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000206# If we have "make <whatever> modules", compile modules
207# in addition to whatever we do anyway.
208# Just "make" or "make all" shall build modules as well
209
210ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
211 KBUILD_MODULES := 1
212endif
213
214ifeq ($(MAKECMDGOALS),)
215 KBUILD_MODULES := 1
216endif
217
218export KBUILD_MODULES KBUILD_BUILTIN
219export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
220
221# Beautify output
222# ---------------------------------------------------------------------------
223#
224# Normally, we echo the whole command before executing it. By making
225# that echo $($(quiet)$(cmd)), we now have the possibility to set
226# $(quiet) to choose other forms of output instead, e.g.
227#
228# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
229# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
230#
231# If $(quiet) is empty, the whole command will be printed.
232# If it is set to "quiet_", only the short version will be printed.
233# If it is set to "silent_", nothing wil be printed at all, since
234# the variable $(silent_cmd_cc_o_c) doesn't exist.
235#
236# A simple variant is to prefix commands with $(Q) - that's useful
237# for commands that shall be hidden in non-verbose mode.
238#
239# $(Q)ln $@ :<
240#
241# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
242# If KBUILD_VERBOSE equals 1 then the above command is displayed.
243
244ifeq ($(KBUILD_VERBOSE),1)
245 quiet =
246 Q =
247else
248 quiet=quiet_
249 Q = @
250endif
251
252# If the user is running make -s (silent mode), suppress echoing of
253# commands
254
255ifneq ($(findstring s,$(MAKEFLAGS)),)
256 quiet=silent_
257endif
258
259export quiet Q KBUILD_VERBOSE
Rob Landleya167ec52006-01-31 02:42:50 +0000260
Bernhard Reutner-Fischerdf100942006-03-13 19:04:00 +0000261
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000262# Look for make include files relative to root of kernel src
263MAKEFLAGS += --include-dir=$(srctree)
Bernhard Reutner-Fischera9d89132005-10-07 18:45:03 +0000264
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000265# We need some generic definitions
266include $(srctree)/scripts/Kbuild.include
Bernhard Reutner-Fischere28d1d62006-05-26 13:22:57 +0000267
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000268# For maximum performance (+ possibly random breakage, uncomment
269# the following)
Eric Andersen00814662001-04-26 23:29:10 +0000270
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000271MAKEFLAGS += -rR
Bernhard Reutner-Fischerdf100942006-03-13 19:04:00 +0000272
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000273# Make variables (CC, etc...)
274
275AS = $(CROSS_COMPILE)as
276LD = $(CROSS_COMPILE)ld
277CC = $(CROSS_COMPILE)gcc
278CPP = $(CC) -E
279AR = $(CROSS_COMPILE)ar
280NM = $(CROSS_COMPILE)nm
281STRIP = $(CROSS_COMPILE)strip
282OBJCOPY = $(CROSS_COMPILE)objcopy
283OBJDUMP = $(CROSS_COMPILE)objdump
284AWK = awk
285GENKSYMS = scripts/genksyms/genksyms
286DEPMOD = /sbin/depmod
287KALLSYMS = scripts/kallsyms
288PERL = perl
289CHECK = sparse
290
291CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
292MODFLAGS = -DMODULE
293CFLAGS_MODULE = $(MODFLAGS)
294AFLAGS_MODULE = $(MODFLAGS)
295LDFLAGS_MODULE = -r
296CFLAGS_KERNEL =
297AFLAGS_KERNEL =
298
299
300# Use LINUXINCLUDE when you must reference the include/ directory.
301# Needed to be compatible with the O= option
302CFLAGS :=
303CPPFLAGS :=
304AFLAGS :=
305include $(srctree)/Makefile.flags
306
307# Read KERNELRELEASE from .kernelrelease (if it exists)
308KERNELRELEASE = $(shell cat .kernelrelease 2> /dev/null)
309KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
310
311export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION \
312 ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
313 CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
314 HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
315
316export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
317export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
318export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
319
320# When compiling out-of-tree modules, put MODVERDIR in the module
321# tree rather than in the kernel tree. The kernel tree might
322# even be read-only.
323export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
324
325# Files to ignore in find ... statements
326
327RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
328export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
329
330# ===========================================================================
331# Rules shared between *config targets and build targets
332
333# Basic helpers built in scripts/
334PHONY += scripts_basic
335scripts_basic:
336 $(Q)$(MAKE) $(build)=scripts/basic
337
338# To avoid any implicit rule to kick in, define an empty command.
339scripts/basic/%: scripts_basic ;
340
341PHONY += outputmakefile
342# outputmakefile generates a Makefile in the output directory, if using a
343# separate output directory. This allows convenient use of make in the
344# output directory.
345outputmakefile:
346ifneq ($(KBUILD_SRC),)
347 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
348 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
349endif
350
351# To make sure we do not include .config for any of the *config targets
352# catch them early, and hand them over to scripts/kconfig/Makefile
353# It is allowed to specify more targets when calling make, including
354# mixing *config targets and build targets.
355# For example 'make oldconfig all'.
356# Detect when mixed targets is specified, and make a second invocation
357# of make so .config is not included in this case either (for *config).
358
359no-dot-config-targets := clean mrproper distclean \
360 cscope TAGS tags help %docs check%
361
362config-targets := 0
363mixed-targets := 0
364dot-config := 1
365
366ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
367 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
368 dot-config := 0
369 endif
370endif
371
372ifeq ($(KBUILD_EXTMOD),)
373 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
374 config-targets := 1
375 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
376 mixed-targets := 1
377 endif
378 endif
379endif
380
381ifeq ($(mixed-targets),1)
382# ===========================================================================
383# We're called with mixed targets (*config and build targets).
384# Handle them one by one.
385
386%:: FORCE
387 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
388
389else
390ifeq ($(config-targets),1)
391# ===========================================================================
392# *config targets only - make sure prerequisites are updated, and descend
393# in scripts/kconfig to make the *config target
394
395# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
396# KBUILD_DEFCONFIG may point out an alternative default configuration
397# used for 'make defconfig'
398-include $(srctree)/arch/$(ARCH)/Makefile
399export KBUILD_DEFCONFIG
400
401config %config: scripts_basic outputmakefile FORCE
Denis Vlasenko665b02c2006-10-11 21:24:42 +0000402 $(Q)mkdir -p include
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000403 $(Q)$(MAKE) $(build)=scripts/kconfig $@
404 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= .kernelrelease
405
406else
407# ===========================================================================
408# Build targets only - this includes busybox, arch specific targets, clean
409# targets and others. In general all targets except *config targets.
410
411ifeq ($(KBUILD_EXTMOD),)
412# Additional helpers built in scripts/
413# Carefully list dependencies so we do not try to build scripts twice
414# in parrallel
415PHONY += scripts
416scripts: scripts_basic include/config/MARKER
417 $(Q)$(MAKE) $(build)=$(@)
418
419scripts_basic: include/autoconf.h
420
421# Objects we will link into busybox / subdirs we need to visit
422core-y := \
423 applets/ \
424
425libs-y := \
426 archival/ \
427 archival/libunarchive/ \
428 console-tools/ \
429 coreutils/ \
430 coreutils/libcoreutils/ \
431 debianutils/ \
432 e2fsprogs/ \
433 e2fsprogs/blkid/ \
434 e2fsprogs/e2p/ \
435 e2fsprogs/ext2fs/ \
436 e2fsprogs/uuid/ \
437 editors/ \
438 findutils/ \
439 init/ \
440 libbb/ \
441 libpwdgrp/ \
442 loginutils/ \
443 miscutils/ \
444 modutils/ \
445 networking/ \
446 networking/libiproute/ \
447 networking/udhcp/ \
448 procps/ \
449 runit/ \
450 shell/ \
451 sysklogd/ \
452 util-linux/ \
453
454endif # KBUILD_EXTMOD
455
456ifeq ($(dot-config),1)
Bernhard Reutner-Fischerdf100942006-03-13 19:04:00 +0000457# In this section, we need .config
Eric Andersen7daa0762004-10-08 07:46:08 +0000458
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000459# Read in dependencies to all Kconfig* files, make sure to run
460# oldconfig if changes are detected.
461-include .kconfig.d
Bernhard Reutner-Fischer5c071bc2005-10-05 07:40:46 +0000462
Denis Vlasenko8bf7bb82006-10-05 17:42:55 +0000463-include .config
Bernhard Reutner-Fischer7ca61b62006-01-15 14:04:57 +0000464
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000465# If .config needs to be updated, it will be done via the dependency
466# that autoconf has on .config.
467# To avoid any implicit rule to kick in, define an empty command
468.config .kconfig.d: ;
Bernhard Reutner-Fischer5d261262006-03-01 22:54:48 +0000469
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000470# If .config is newer than include/autoconf.h, someone tinkered
471# with it and forgot to run make oldconfig.
472# If kconfig.d is missing then we are probarly in a cleaned tree so
473# we execute the config step to be sure to catch updated Kconfig files
474include/autoconf.h: .kconfig.d .config
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000475 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
Bernhard Reutner-Fischerdf100942006-03-13 19:04:00 +0000476
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000477else
478# Dummy target needed, because used as prerequisite
479include/autoconf.h: ;
Bernhard Reutner-Fischer08c5a172006-01-25 15:58:04 +0000480endif
481
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000482# The all: target is the default when no target is given on the
483# command line.
484# This allow a user to issue only 'make' to build a kernel including modules
485# Defaults busybox but it is usually overriden in the arch makefile
486all: busybox
487
488-include $(srctree)/arch/$(ARCH)/Makefile
489
490# arch Makefile may override CC so keep this after arch Makefile is included
491#bbox# NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
492CHECKFLAGS += $(NOSTDINC_FLAGS)
493
494# warn about C99 declaration after statement
495CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
496
497# disable pointer signedness warnings in gcc 4.0
498CFLAGS += $(call cc-option,-Wno-pointer-sign,)
499
500# Default kernel image to build when no specific target is given.
501# KBUILD_IMAGE may be overruled on the commandline or
502# set in the environment
503# Also any assignments in arch/$(ARCH)/Makefile take precedence over
504# this default value
505export KBUILD_IMAGE ?= busybox
506
507#
508# INSTALL_PATH specifies where to place the updated kernel and system map
509# images. Default is /boot, but you can set it to other values
510export INSTALL_PATH ?= /boot
511
512#
513# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
514# relocations required by build roots. This is not defined in the
515# makefile but the arguement can be passed to make if needed.
516#
517
518MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
519export MODLIB
520
521
522ifeq ($(KBUILD_EXTMOD),)
523busybox-dirs := $(patsubst %/,%,$(filter %/, $(core-y) $(core-m) $(libs-y) $(libs-m)))
524
525busybox-alldirs := $(sort $(busybox-dirs) $(patsubst %/,%,$(filter %/, \
526 $(core-n) $(core-) $(libs-n) $(libs-) \
527 )))
528
529core-y := $(patsubst %/, %/built-in.o, $(core-y))
530libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
531libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
532libs-y := $(libs-y1) $(libs-y2)
533
534
535# Build busybox
536# ---------------------------------------------------------------------------
537# busybox is build from the objects selected by $(busybox-init) and
538# $(busybox-main). Most are built-in.o files from top-level directories
539# in the kernel tree, others are specified in arch/$(ARCH)Makefile.
540# Ordering when linking is important, and $(busybox-init) must be first.
541#
542# busybox
543# ^
544# |
545# +-< $(busybox-init)
546# | +--< init/version.o + more
547# |
548# +--< $(busybox-main)
549# | +--< driver/built-in.o mm/built-in.o + more
550# |
551# +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
552#
553# busybox version (uname -v) cannot be updated during normal
554# descending-into-subdirs phase since we do not yet know if we need to
555# update busybox.
556# Therefore this step is delayed until just before final link of busybox -
557# except in the kallsyms case where it is done just before adding the
558# symbols to the kernel.
559#
560# System.map is generated to document addresses of all kernel symbols
561
562busybox-all := $(core-y) $(libs-y)
563
564# Rule to link busybox - also used during CONFIG_KALLSYMS
565# May be overridden by arch/$(ARCH)/Makefile
566quiet_cmd_busybox__ ?= LINK $@
Denis Vlasenkocba9ef52006-10-10 21:00:47 +0000567ifdef CONFIG_STATIC
568 cmd_busybox__ ?= $(srctree)/scripts/trylink $(CC) \
569 -static \
570 -o $@ \
571 -Wl,--warn-common -Wl,--sort-common -Wl,--gc-sections \
572 -Wl,--start-group $(busybox-all) -Wl,--end-group
573else
Denis Vlasenko18684092006-10-05 17:11:08 +0000574 cmd_busybox__ ?= $(srctree)/scripts/trylink $(CC) -o $@ \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000575 -Wl,--warn-common -Wl,--sort-common -Wl,--gc-sections \
Denis Vlasenkocba9ef52006-10-10 21:00:47 +0000576 -Wl,--start-group $(busybox-all) -Wl,--end-group
577endif
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000578
579# Generate System.map
580quiet_cmd_sysmap = SYSMAP
581 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
582
583# Link of busybox
584# If CONFIG_KALLSYMS is set .version is already updated
585# Generate System.map and verify that the content is consistent
586# Use + in front of the busybox_version rule to silent warning with make -j2
587# First command is ':' to allow us to use + in front of the rule
588define rule_busybox__
589 :
590 $(call cmd,busybox__)
591 $(Q)echo 'cmd_$@ := $(cmd_busybox__)' > $(@D)/.$(@F).cmd
592endef
593
594
595ifdef CONFIG_KALLSYMS
596# Generate section listing all symbols and add it into busybox $(kallsyms.o)
597# It's a three stage process:
598# o .tmp_busybox1 has all symbols and sections, but __kallsyms is
599# empty
600# Running kallsyms on that gives us .tmp_kallsyms1.o with
601# the right size - busybox version (uname -v) is updated during this step
602# o .tmp_busybox2 now has a __kallsyms section of the right size,
603# but due to the added section, some addresses have shifted.
604# From here, we generate a correct .tmp_kallsyms2.o
605# o The correct .tmp_kallsyms2.o is linked into the final busybox.
606# o Verify that the System.map from busybox matches the map from
607# .tmp_busybox2, just in case we did not generate kallsyms correctly.
608# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
609# .tmp_busybox3 and .tmp_kallsyms3.o. This is only meant as a
610# temporary bypass to allow the kernel to be built while the
611# maintainers work out what went wrong with kallsyms.
612
613ifdef CONFIG_KALLSYMS_EXTRA_PASS
614last_kallsyms := 3
615else
616last_kallsyms := 2
Bernhard Reutner-Fischer7ca61b62006-01-15 14:04:57 +0000617endif
Bernhard Reutner-Fischer7ca61b62006-01-15 14:04:57 +0000618
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000619kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
Bernhard Reutner-Fischer7ca61b62006-01-15 14:04:57 +0000620
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000621define verify_kallsyms
622 $(Q)$(if $($(quiet)cmd_sysmap), \
623 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
624 $(cmd_sysmap) .tmp_busybox$(last_kallsyms) .tmp_System.map
625 $(Q)cmp -s System.map .tmp_System.map || \
626 (echo Inconsistent kallsyms data; \
627 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
628 rm .tmp_kallsyms* ; /bin/false )
629endef
630
631# Update busybox version before link
632# Use + in front of this rule to silent warning about make -j1
633# First command is ':' to allow us to use + in front of this rule
634cmd_ksym_ld = $(cmd_busybox__)
635define rule_ksym_ld
636 :
637 +$(call cmd,busybox_version)
638 $(call cmd,busybox__)
639 $(Q)echo 'cmd_$@ := $(cmd_busybox__)' > $(@D)/.$(@F).cmd
640endef
641
642# Generate .S file with all kernel symbols
643quiet_cmd_kallsyms = KSYM $@
644 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
645 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
646
647.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
648 $(call if_changed_dep,as_o_S)
649
650.tmp_kallsyms%.S: .tmp_busybox% $(KALLSYMS)
651 $(call cmd,kallsyms)
652
653# .tmp_busybox1 must be complete except kallsyms, so update busybox version
654.tmp_busybox1: $(busybox-lds) $(busybox-all) FORCE
655 $(call if_changed_rule,ksym_ld)
656
657.tmp_busybox2: $(busybox-lds) $(busybox-all) .tmp_kallsyms1.o FORCE
658 $(call if_changed,busybox__)
659
660.tmp_busybox3: $(busybox-lds) $(busybox-all) .tmp_kallsyms2.o FORCE
661 $(call if_changed,busybox__)
662
663# Needs to visit scripts/ before $(KALLSYMS) can be used.
664$(KALLSYMS): scripts ;
665
666# Generate some data for debugging strange kallsyms problems
667debug_kallsyms: .tmp_map$(last_kallsyms)
668
669.tmp_map%: .tmp_busybox% FORCE
670 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
671
672.tmp_map3: .tmp_map2
673
674.tmp_map2: .tmp_map1
675
676endif # ifdef CONFIG_KALLSYMS
677
678# busybox image - including updated kernel symbols
679busybox_unstripped: $(busybox-all) FORCE
680 $(call if_changed_rule,busybox__)
681 $(Q)rm -f .old_version
Bernhard Reutner-Fischercfc5d862006-03-02 09:44:32 +0000682
683busybox: busybox_unstripped
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000684 $(Q)strip -s --remove-section=.note --remove-section=.comment \
685 busybox_unstripped -o $@
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000686
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000687# The actual objects are generated when descending,
688# make sure no implicit rule kicks in
689$(sort $(busybox-all)): $(busybox-dirs) ;
Mike Frysinger586ea612006-04-21 01:18:07 +0000690
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000691# Handle descending into subdirectories listed in $(busybox-dirs)
692# Preset locale variables to speed up the build process. Limit locale
693# tweaks to this spot to avoid wrong language settings when running
694# make menuconfig etc.
695# Error messages still appears in the original language
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000696
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000697PHONY += $(busybox-dirs)
698$(busybox-dirs): prepare scripts
699 $(Q)$(MAKE) $(build)=$@
700
701# Build the kernel release string
702# The KERNELRELEASE is stored in a file named .kernelrelease
703# to be used when executing for example make install or make modules_install
704#
705# Take the contents of any files called localversion* and the config
706# variable CONFIG_LOCALVERSION and append them to KERNELRELEASE.
707# LOCALVERSION from the command line override all of this
708
709nullstring :=
710space := $(nullstring) # end of line
711
712___localver = $(objtree)/localversion* $(srctree)/localversion*
713__localver = $(sort $(wildcard $(___localver)))
714# skip backup files (containing '~')
715_localver = $(foreach f, $(__localver), $(if $(findstring ~, $(f)),,$(f)))
716
717localver = $(subst $(space),, \
718 $(shell cat /dev/null $(_localver)) \
719 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
720
721# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
722# and if the SCM is know a tag from the SCM is appended.
723# The appended tag is determinded by the SCM used.
724#
725# Currently, only git is supported.
726# Other SCMs can edit scripts/setlocalversion and add the appropriate
727# checks as needed.
728ifdef CONFIG_LOCALVERSION_AUTO
729 _localver-auto = $(shell $(CONFIG_SHELL) \
730 $(srctree)/scripts/setlocalversion $(srctree))
731 localver-auto = $(LOCALVERSION)$(_localver-auto)
Eric Andersen13879102004-08-26 23:13:00 +0000732endif
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000733
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000734localver-full = $(localver)$(localver-auto)
Eric Andersen1f30a412002-04-13 13:39:48 +0000735
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000736# Store (new) KERNELRELASE string in .kernelrelease
737kernelrelease = $(KERNELVERSION)$(localver-full)
738.kernelrelease: FORCE
739 $(Q)rm -f $@
740 $(Q)echo $(kernelrelease) > $@
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000741
Rob Landleyd9872aa2006-05-27 21:24:16 +0000742
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000743# Things we need to do before we recursively start building the kernel
744# or the modules are listed in "prepare".
745# A multi level approach is used. prepareN is processed before prepareN-1.
746# archprepare is used in arch Makefiles and when processed asm symlink,
747# version.h and scripts_basic is processed / created.
Rob Landleyd9872aa2006-05-27 21:24:16 +0000748
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000749# Listed in dependency order
750PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
Rob Landley16890752005-09-02 00:41:53 +0000751
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000752# prepare-all is deprecated, use prepare as valid replacement
753PHONY += prepare-all
Rob Landleyd9872aa2006-05-27 21:24:16 +0000754
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000755# prepare3 is used to check if we are building in a separate output directory,
756# and if so do:
757# 1) Check that make has not been executed in the kernel src $(srctree)
758# 2) Create the include2 directory, used for the second asm symlink
759prepare3: .kernelrelease
760ifneq ($(KBUILD_SRC),)
761 @echo ' Using $(srctree) as source for kernel'
762 $(Q)if [ -f $(srctree)/.config ]; then \
763 echo " $(srctree) is not clean, please run 'make mrproper'";\
764 echo " in the '$(srctree)' directory.";\
765 /bin/false; \
Bernhard Reutner-Fischerdf100942006-03-13 19:04:00 +0000766 fi;
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000767 $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
768 $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
769endif
Eric Andersen85208e22002-04-12 12:05:57 +0000770
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000771# prepare2 creates a makefile if using a separate output directory
772prepare2: prepare3 outputmakefile
Eric Andersencc8ed391999-10-05 16:24:54 +0000773
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000774prepare1: prepare2 include/config/MARKER
775ifneq ($(KBUILD_MODULES),)
776 $(Q)mkdir -p $(MODVERDIR)
777 $(Q)rm -f $(MODVERDIR)/*
778endif
Eric Andersencc8ed391999-10-05 16:24:54 +0000779
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000780archprepare: prepare1 scripts_basic
Mark Whitleydd23b8b2000-07-10 23:00:47 +0000781
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000782prepare0: archprepare FORCE
783 $(Q)$(MAKE) $(build)=.
Matt Kraai4e05da82001-11-19 19:47:56 +0000784
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000785# All the preparing..
786prepare prepare-all: prepare0
Bernhard Reutner-Fischerfa61ca72006-06-16 17:19:39 +0000787
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000788# Leave this as default for preprocessing busybox.lds.S, which is now
789# done in arch/$(ARCH)/kernel/Makefile
790
791export CPPFLAGS_busybox.lds += -P -C -U$(ARCH)
792
793# FIXME: The asm symlink changes when $(ARCH) changes. That's
794# hard to detect, but I suppose "make mrproper" is a good idea
795# before switching between archs anyway.
796
797#bbox# include/asm:
798#bbox# @echo ' SYMLINK $@ -> include/asm-$(ARCH)'
799#bbox# $(Q)if [ ! -d include ]; then mkdir -p include; fi;
800#bbox# @ln -fsn asm-$(ARCH) $@
801
802# Split autoconf.h into include/linux/config/*
803#bbox# piggybacked generation of few .h files
804include/config/MARKER: scripts/basic/split-include include/autoconf.h
805 @echo ' SPLIT include/autoconf.h -> include/config/*'
806 @scripts/basic/split-include include/autoconf.h include/config
807 @echo ' GEN include/bbconfigopts.h'
Denis Vlasenko18684092006-10-05 17:11:08 +0000808 @$(srctree)/scripts/mkconfigs >include/bbconfigopts.h
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000809 @$(MAKE) $(build)=scripts
810 @echo ' GEN include/usage_compressed.h'
Denis Vlasenko18684092006-10-05 17:11:08 +0000811 @$(srctree)/scripts/usage_compressed include/usage_compressed.h scripts
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000812 @touch $@
813
814# Generate some files
815# ---------------------------------------------------------------------------
816
817# KERNELRELEASE can change from a few different places, meaning version.h
818# needs to be updated, so this check is forced on all builds
819
820uts_len := 64
821
822define filechk_version.h
823 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
824 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
825 exit 1; \
826 fi; \
827 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
828 echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
829 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
830 )
831endef
832
833# ---------------------------------------------------------------------------
834
835PHONY += depend dep
836depend dep:
837 @echo '*** Warning: make $@ is unnecessary now.'
838
839# ---------------------------------------------------------------------------
840# Modules
841
842ifdef CONFIG_MODULES
843
844# By default, build modules as well
845
846all: modules
847
848# Build modules
849
850PHONY += modules
851modules: $(busybox-dirs) $(if $(KBUILD_BUILTIN),busybox)
852 @echo ' Building modules, stage 2.';
853 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
Bernhard Reutner-Fischerfa61ca72006-06-16 17:19:39 +0000854
Bernhard Reutner-Fischer07a79e72006-03-09 09:03:37 +0000855
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000856# Target to prepare building external modules
857PHONY += modules_prepare
858modules_prepare: prepare scripts
Bernhard Reutner-Fischerdf100942006-03-13 19:04:00 +0000859
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000860# Target to install modules
861PHONY += modules_install
862modules_install: _modinst_ _modinst_post
863
864PHONY += _modinst_
865_modinst_:
866 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
867 echo "Warning: you may need to install module-init-tools"; \
868 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
869 sleep 1; \
870 fi
871 @rm -rf $(MODLIB)/kernel
872 @rm -f $(MODLIB)/source
873 @mkdir -p $(MODLIB)/kernel
874 @ln -s $(srctree) $(MODLIB)/source
875 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
876 rm -f $(MODLIB)/build ; \
877 ln -s $(objtree) $(MODLIB)/build ; \
878 fi
879 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
880
881# If System.map exists, run depmod. This deliberately does not have a
882# dependency on System.map since that would run the dependency tree on
883# busybox. This depmod is only for convenience to give the initial
884# boot a modules.dep even before / is mounted read-write. However the
885# boot script depmod is the master version.
886ifeq "$(strip $(INSTALL_MOD_PATH))" ""
887depmod_opts :=
888else
889depmod_opts := -b $(INSTALL_MOD_PATH) -r
890endif
891PHONY += _modinst_post
892_modinst_post: _modinst_
893 if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
894
895else # CONFIG_MODULES
896
897# Modules not configured
898# ---------------------------------------------------------------------------
899
900modules modules_install: FORCE
901 @echo
902 @echo "The present kernel configuration has modules disabled."
903 @echo "Type 'make config' and enable loadable module support."
904 @echo "Then build a kernel with module support enabled."
905 @echo
906 @exit 1
907
908endif # CONFIG_MODULES
909
910###
911# Cleaning is done on three levels.
912# make clean Delete most generated files
913# Leave enough to build external modules
914# make mrproper Delete the current configuration, and all generated files
915# make distclean Remove editor backup files, patch leftover files and the like
916
917# Directories & files removed with 'make clean'
918CLEAN_DIRS += $(MODVERDIR)
Denis Vlasenko8bf7bb82006-10-05 17:42:55 +0000919CLEAN_FILES += busybox* System.map \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000920 .tmp_kallsyms* .tmp_version .tmp_busybox* .tmp_System.map
921
922# Directories & files removed with 'make mrproper'
923MRPROPER_DIRS += include/config include2
924MRPROPER_FILES += .config .config.old include/asm .version .old_version \
Denis Vlasenko8bf7bb82006-10-05 17:42:55 +0000925 include/autoconf.h \
926 include/bbconfigopts.h \
927 include/usage_compressed.h \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000928 .kernelrelease Module.symvers tags TAGS cscope*
929
930# clean - Delete most, but leave enough to build external modules
931#
932clean: rm-dirs := $(CLEAN_DIRS)
933clean: rm-files := $(CLEAN_FILES)
934clean-dirs := $(addprefix _clean_,$(srctree) $(busybox-alldirs))
935
936PHONY += $(clean-dirs) clean archclean
937$(clean-dirs):
938 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
939
940clean: archclean $(clean-dirs)
941 $(call cmd,rmdirs)
942 $(call cmd,rmfiles)
943 @find . $(RCS_FIND_IGNORE) \
944 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
945 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
946 -type f -print | xargs rm -f
947
948# mrproper - Delete all generated files, including .config
949#
950mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
951mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
Denis Vlasenko8bf7bb82006-10-05 17:42:55 +0000952mrproper-dirs := $(addprefix _mrproper_,scripts)
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000953
954PHONY += $(mrproper-dirs) mrproper archmrproper
955$(mrproper-dirs):
956 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
957
958mrproper: clean archmrproper $(mrproper-dirs)
959 $(call cmd,rmdirs)
960 $(call cmd,rmfiles)
961
962# distclean
963#
964PHONY += distclean
965
966distclean: mrproper
967 @find $(srctree) $(RCS_FIND_IGNORE) \
968 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
969 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
970 -o -name '.*.rej' -o -size 0 \
971 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
972 -type f -print | xargs rm -f
973
974
975# Packaging of the kernel to various formats
976# ---------------------------------------------------------------------------
977# rpm target kept for backward compatibility
978package-dir := $(srctree)/scripts/package
979
980%pkg: FORCE
981 $(Q)$(MAKE) $(build)=$(package-dir) $@
982rpm: FORCE
983 $(Q)$(MAKE) $(build)=$(package-dir) $@
984
985
986# Brief documentation of the typical targets used
987# ---------------------------------------------------------------------------
988
989boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
990boards := $(notdir $(boards))
991
992-include Makefile.help
993
994# Documentation targets
995# ---------------------------------------------------------------------------
996%docs: scripts_basic FORCE
997 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
998
999else # KBUILD_EXTMOD
1000
1001###
1002# External module support.
1003# When building external modules the kernel used as basis is considered
1004# read-only, and no consistency checks are made and the make
1005# system is not used on the basis kernel. If updates are required
1006# in the basis kernel ordinary make commands (without M=...) must
1007# be used.
1008#
1009# The following are the only valid targets when building external
1010# modules.
1011# make M=dir clean Delete all automatically generated files
1012# make M=dir modules Make all modules in specified dir
1013# make M=dir Same as 'make M=dir modules'
1014# make M=dir modules_install
1015# Install the modules build in the module directory
1016# Assumes install directory is already created
1017
1018# We are always building modules
1019KBUILD_MODULES := 1
1020PHONY += crmodverdir
1021crmodverdir:
1022 $(Q)mkdir -p $(MODVERDIR)
1023 $(Q)rm -f $(MODVERDIR)/*
1024
1025PHONY += $(objtree)/Module.symvers
1026$(objtree)/Module.symvers:
1027 @test -e $(objtree)/Module.symvers || ( \
1028 echo; \
1029 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1030 echo " is missing; modules will have no dependencies and modversions."; \
1031 echo )
1032
1033module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1034PHONY += $(module-dirs) modules
1035$(module-dirs): crmodverdir $(objtree)/Module.symvers
1036 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1037
1038modules: $(module-dirs)
1039 @echo ' Building modules, stage 2.';
1040 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1041
1042PHONY += modules_install
1043modules_install: _emodinst_ _emodinst_post
1044
1045install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1046PHONY += _emodinst_
1047_emodinst_:
1048 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1049 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
1050
1051# Run depmod only is we have System.map and depmod is executable
1052quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1053 cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \
1054 $(DEPMOD) -ae -F System.map \
1055 $(if $(strip $(INSTALL_MOD_PATH)), \
1056 -b $(INSTALL_MOD_PATH) -r) \
1057 $(KERNELRELEASE); \
1058 fi
1059
1060PHONY += _emodinst_post
1061_emodinst_post: _emodinst_
1062 $(call cmd,depmod)
1063
1064clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1065
1066PHONY += $(clean-dirs) clean
1067$(clean-dirs):
1068 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1069
1070clean: rm-dirs := $(MODVERDIR)
1071clean: $(clean-dirs)
1072 $(call cmd,rmdirs)
1073 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1074 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1075 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1076 -type f -print | xargs rm -f
1077
1078help:
1079 @echo ' Building external modules.'
1080 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1081 @echo ''
1082 @echo ' modules - default target, build the module(s)'
1083 @echo ' modules_install - install the module'
1084 @echo ' clean - remove generated files in module directory only'
1085 @echo ''
1086
1087# Dummies...
1088PHONY += prepare scripts
1089prepare: ;
1090scripts: ;
1091endif # KBUILD_EXTMOD
1092
1093# Generate tags for editors
1094# ---------------------------------------------------------------------------
1095
1096#We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1097#(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1098#Adding $(srctree) adds about 20M on i386 to the size of the output file!
1099
1100ifeq ($(src),$(obj))
1101__srctree =
1102else
1103__srctree = $(srctree)/
1104endif
1105
1106ifeq ($(ALLSOURCE_ARCHS),)
1107ifeq ($(ARCH),um)
1108ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1109else
1110ALLINCLUDE_ARCHS := $(ARCH)
1111endif
1112else
1113#Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1114ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1115endif
1116
1117ALLSOURCE_ARCHS := $(ARCH)
1118
1119define all-sources
1120 ( find $(__srctree) $(RCS_FIND_IGNORE) \
1121 \( -name include -o -name arch \) -prune -o \
1122 -name '*.[chS]' -print; \
1123 for ARCH in $(ALLSOURCE_ARCHS) ; do \
1124 find $(__srctree)arch/$${ARCH} $(RCS_FIND_IGNORE) \
1125 -name '*.[chS]' -print; \
1126 done ; \
1127 find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1128 -name '*.[chS]' -print; \
1129 find $(__srctree)include $(RCS_FIND_IGNORE) \
1130 \( -name config -o -name 'asm-*' \) -prune \
1131 -o -name '*.[chS]' -print; \
1132 for ARCH in $(ALLINCLUDE_ARCHS) ; do \
1133 find $(__srctree)include/asm-$${ARCH} $(RCS_FIND_IGNORE) \
1134 -name '*.[chS]' -print; \
1135 done ; \
1136 find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1137 -name '*.[chS]' -print )
1138endef
1139
1140quiet_cmd_cscope-file = FILELST cscope.files
1141 cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1142
1143quiet_cmd_cscope = MAKE cscope.out
1144 cmd_cscope = cscope -b
1145
1146cscope: FORCE
1147 $(call cmd,cscope-file)
1148 $(call cmd,cscope)
1149
1150quiet_cmd_TAGS = MAKE $@
1151define cmd_TAGS
1152 rm -f $@; \
1153 ETAGSF=`etags --version | grep -i exuberant >/dev/null && \
1154 echo "-I __initdata,__exitdata,__acquires,__releases \
1155 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1156 --extra=+f --c-kinds=+px"`; \
1157 $(all-sources) | xargs etags $$ETAGSF -a
1158endef
1159
1160TAGS: FORCE
1161 $(call cmd,TAGS)
1162
1163
1164quiet_cmd_tags = MAKE $@
1165define cmd_tags
1166 rm -f $@; \
1167 CTAGSF=`ctags --version | grep -i exuberant >/dev/null && \
1168 echo "-I __initdata,__exitdata,__acquires,__releases \
1169 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1170 --extra=+f --c-kinds=+px"`; \
1171 $(all-sources) | xargs ctags $$CTAGSF -a
1172endef
1173
1174tags: FORCE
1175 $(call cmd,tags)
1176
1177
1178# Scripts to check various things for consistency
1179# ---------------------------------------------------------------------------
1180
1181includecheck:
1182 find * $(RCS_FIND_IGNORE) \
1183 -name '*.[hcS]' -type f -print | sort \
1184 | xargs $(PERL) -w scripts/checkincludes.pl
1185
1186versioncheck:
1187 find * $(RCS_FIND_IGNORE) \
1188 -name '*.[hcS]' -type f -print | sort \
1189 | xargs $(PERL) -w scripts/checkversion.pl
1190
1191namespacecheck:
1192 $(PERL) $(srctree)/scripts/namespace.pl
1193
1194endif #ifeq ($(config-targets),1)
1195endif #ifeq ($(mixed-targets),1)
1196
1197PHONY += checkstack
1198checkstack:
1199 $(OBJDUMP) -d busybox $$(find . -name '*.ko') | \
1200 $(PERL) $(src)/scripts/checkstack.pl $(ARCH)
1201
1202kernelrelease:
1203 $(if $(wildcard .kernelrelease), $(Q)echo $(KERNELRELEASE), \
1204 $(error kernelrelease not valid - run 'make *config' to update it))
1205kernelversion:
1206 @echo $(KERNELVERSION)
1207
1208# Single targets
1209# ---------------------------------------------------------------------------
1210# Single targets are compatible with:
1211# - build whith mixed source and output
1212# - build with separate output dir 'make O=...'
1213# - external modules
1214#
1215# target-dir => where to store outputfile
1216# build-dir => directory in kernel source tree to use
1217
1218ifeq ($(KBUILD_EXTMOD),)
1219 build-dir = $(patsubst %/,%,$(dir $@))
1220 target-dir = $(dir $@)
1221else
1222 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1223 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1224 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1225endif
1226
1227%.s: %.c prepare scripts FORCE
1228 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1229%.i: %.c prepare scripts FORCE
1230 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1231%.o: %.c prepare scripts FORCE
1232 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1233%.lst: %.c prepare scripts FORCE
1234 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1235%.s: %.S prepare scripts FORCE
1236 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1237%.o: %.S prepare scripts FORCE
1238 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1239
1240# Modules
1241/ %/: prepare scripts FORCE
1242 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1243 $(build)=$(build-dir)
1244%.ko: prepare scripts FORCE
1245 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1246 $(build)=$(build-dir) $(@:.ko=.o)
1247 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1248
1249# FIXME Should go into a make.lib or something
1250# ===========================================================================
1251
1252quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1253 cmd_rmdirs = rm -rf $(rm-dirs)
1254
1255quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1256 cmd_rmfiles = rm -f $(rm-files)
1257
1258
1259a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1260 $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1261 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
1262
1263quiet_cmd_as_o_S = AS $@
1264cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1265
1266# read all saved command lines
1267
1268targets := $(wildcard $(sort $(targets)))
1269cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1270
1271ifneq ($(cmd_files),)
1272 $(cmd_files): ; # Do not try to update included dependency files
1273 include $(cmd_files)
1274endif
1275
1276# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1277# Usage:
1278# $(Q)$(MAKE) $(clean)=dir
1279clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1280
1281endif # skip-makefile
1282
1283PHONY += FORCE
1284FORCE:
1285
1286-include Makefile.custom
1287
1288# Declare the contents of the .PHONY variable as phony. We keep that
1289# information in a variable se we can use it in if_changed and friends.
1290.PHONY: $(PHONY)