blob: 0f21ccff329c51b0c283c01a4f8e3d2da7146b8d [file] [log] [blame]
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001VERSION = 1
Denis Vlasenko8e5b6f52007-12-24 17:32:22 +00002PATCHLEVEL = 10
Denis Vlasenkoa883fa42006-12-13 23:52:32 +00003SUBLEVEL = 0
Denis Vlasenko8e5b6f52007-12-24 17:32:22 +00004EXTRAVERSION = .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 := $(M)
Bernhard Reutner-Fischer7b8ff222006-06-13 14:20:17 +000065 endif
66endif
67
Denis Vlasenko7d219aa2006-10-05 10:17:08 +000068
69# kbuild supports saving output files in a separate directory.
70# To locate output files in a separate directory two syntaxes are supported.
71# In both cases the working directory must be the root of the kernel src.
72# 1) O=
73# Use "make O=dir/to/store/output/files/"
Denis Vlasenkof7996f32007-01-11 17:20:00 +000074#
Denis Vlasenko7d219aa2006-10-05 10:17:08 +000075# 2) Set KBUILD_OUTPUT
76# Set the environment variable KBUILD_OUTPUT to point to the directory
77# where the output files shall be placed.
78# export KBUILD_OUTPUT=dir/to/store/output/files/
79# make
80#
81# The O= assignment takes precedence over the KBUILD_OUTPUT environment
82# variable.
83
84
85# KBUILD_SRC is set on invocation of make in OBJ directory
86# KBUILD_SRC is not intended to be used by the regular user (for now)
87ifeq ($(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,
Denis Vlasenkof7996f32007-01-11 17:20:00 +0000148# then ARCH is assigned, getting whatever value it gets normally, and
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000149# 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 +0000186# Decide whether to build built-in, modular, or both.
187# Normally, just do built-in.
Bernhard Reutner-Fischer5c071bc2005-10-05 07:40:46 +0000188
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000189KBUILD_MODULES :=
190KBUILD_BUILTIN := 1
Bernhard Reutner-Fischer5c071bc2005-10-05 07:40:46 +0000191
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000192# If we have only "make modules", don't compile built-in objects.
193# When we're building modules with modversions, we need to consider
194# the built-in objects during the descend as well, in order to
195# make sure the checksums are uptodate before we record them.
Bernhard Reutner-Fischer5c071bc2005-10-05 07:40:46 +0000196
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000197ifeq ($(MAKECMDGOALS),modules)
198 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
199endif
Rob Landleya167ec52006-01-31 02:42:50 +0000200
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000201# If we have "make <whatever> modules", compile modules
202# in addition to whatever we do anyway.
203# Just "make" or "make all" shall build modules as well
204
205ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
206 KBUILD_MODULES := 1
207endif
208
209ifeq ($(MAKECMDGOALS),)
210 KBUILD_MODULES := 1
211endif
212
213export KBUILD_MODULES KBUILD_BUILTIN
214export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
215
216# Beautify output
217# ---------------------------------------------------------------------------
218#
219# Normally, we echo the whole command before executing it. By making
220# that echo $($(quiet)$(cmd)), we now have the possibility to set
221# $(quiet) to choose other forms of output instead, e.g.
222#
223# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
224# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
225#
226# If $(quiet) is empty, the whole command will be printed.
Denis Vlasenkof7996f32007-01-11 17:20:00 +0000227# If it is set to "quiet_", only the short version will be printed.
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000228# If it is set to "silent_", nothing wil be printed at all, since
229# the variable $(silent_cmd_cc_o_c) doesn't exist.
230#
231# A simple variant is to prefix commands with $(Q) - that's useful
232# for commands that shall be hidden in non-verbose mode.
233#
234# $(Q)ln $@ :<
235#
236# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
237# If KBUILD_VERBOSE equals 1 then the above command is displayed.
238
239ifeq ($(KBUILD_VERBOSE),1)
240 quiet =
241 Q =
242else
243 quiet=quiet_
244 Q = @
245endif
246
247# If the user is running make -s (silent mode), suppress echoing of
248# commands
249
250ifneq ($(findstring s,$(MAKEFLAGS)),)
251 quiet=silent_
252endif
253
254export quiet Q KBUILD_VERBOSE
Rob Landleya167ec52006-01-31 02:42:50 +0000255
Bernhard Reutner-Fischerdf100942006-03-13 19:04:00 +0000256
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000257# Look for make include files relative to root of kernel src
258MAKEFLAGS += --include-dir=$(srctree)
Bernhard Reutner-Fischera9d89132005-10-07 18:45:03 +0000259
Bernhard Reutner-Fischeree921392007-06-20 10:01:12 +0000260HOSTCC = gcc
261HOSTCXX = g++
262HOSTCFLAGS :=
263HOSTCXXFLAGS :=
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000264# We need some generic definitions
Denis Vlasenko14aa9f72006-10-31 23:03:09 +0000265include $(srctree)/scripts/Kbuild.include
Bernhard Reutner-Fischere28d1d62006-05-26 13:22:57 +0000266
Bernhard Reutner-Fischeree921392007-06-20 10:01:12 +0000267HOSTCFLAGS += $(call hostcc-option,-Wall -Wstrict-prototypes -O2 -fomit-frame-pointer,)
268HOSTCXXFLAGS += -O2
269
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000270# For maximum performance (+ possibly random breakage, uncomment
271# the following)
Eric Andersen00814662001-04-26 23:29:10 +0000272
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000273MAKEFLAGS += -rR
Bernhard Reutner-Fischerdf100942006-03-13 19:04:00 +0000274
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000275# Make variables (CC, etc...)
276
277AS = $(CROSS_COMPILE)as
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000278CC = $(CROSS_COMPILE)gcc
Bernhard Reutner-Fischere86bd6c2007-01-09 17:36:26 +0000279LD = $(CC) -nostdlib
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000280CPP = $(CC) -E
281AR = $(CROSS_COMPILE)ar
282NM = $(CROSS_COMPILE)nm
283STRIP = $(CROSS_COMPILE)strip
284OBJCOPY = $(CROSS_COMPILE)objcopy
285OBJDUMP = $(CROSS_COMPILE)objdump
286AWK = awk
287GENKSYMS = scripts/genksyms/genksyms
288DEPMOD = /sbin/depmod
289KALLSYMS = scripts/kallsyms
290PERL = perl
291CHECK = sparse
292
293CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
294MODFLAGS = -DMODULE
295CFLAGS_MODULE = $(MODFLAGS)
296AFLAGS_MODULE = $(MODFLAGS)
297LDFLAGS_MODULE = -r
298CFLAGS_KERNEL =
299AFLAGS_KERNEL =
300
301
302# Use LINUXINCLUDE when you must reference the include/ directory.
303# Needed to be compatible with the O= option
Mike Frysinger5b6195c2007-01-26 07:14:01 +0000304CFLAGS := $(CFLAGS)
305CPPFLAGS := $(CPPFLAGS)
306AFLAGS := $(AFLAGS)
Mike Frysinger52a9db62007-03-30 05:44:15 +0000307LDFLAGS := $(LDFLAGS)
308LDLIBS :=
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000309
310# Read KERNELRELEASE from .kernelrelease (if it exists)
311KERNELRELEASE = $(shell cat .kernelrelease 2> /dev/null)
312KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
313
314export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION \
315 ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
316 CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
Mike Frysinger9020d852007-04-05 21:14:29 +0000317 HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000318
319export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
Denis Vlasenkof7996f32007-01-11 17:20:00 +0000320export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000321export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
Mike Frysinger9020d852007-04-05 21:14:29 +0000322export FLTFLAGS
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000323
324# When compiling out-of-tree modules, put MODVERDIR in the module
325# tree rather than in the kernel tree. The kernel tree might
326# even be read-only.
327export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
328
329# Files to ignore in find ... statements
330
331RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
332export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
333
334# ===========================================================================
335# Rules shared between *config targets and build targets
336
337# Basic helpers built in scripts/
338PHONY += scripts_basic
339scripts_basic:
340 $(Q)$(MAKE) $(build)=scripts/basic
341
342# To avoid any implicit rule to kick in, define an empty command.
343scripts/basic/%: scripts_basic ;
344
345PHONY += outputmakefile
346# outputmakefile generates a Makefile in the output directory, if using a
347# separate output directory. This allows convenient use of make in the
348# output directory.
349outputmakefile:
350ifneq ($(KBUILD_SRC),)
351 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
352 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
353endif
354
355# To make sure we do not include .config for any of the *config targets
356# catch them early, and hand them over to scripts/kconfig/Makefile
357# It is allowed to specify more targets when calling make, including
358# mixing *config targets and build targets.
Denis Vlasenkof7996f32007-01-11 17:20:00 +0000359# For example 'make oldconfig all'.
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000360# Detect when mixed targets is specified, and make a second invocation
361# of make so .config is not included in this case either (for *config).
362
363no-dot-config-targets := clean mrproper distclean \
364 cscope TAGS tags help %docs check%
365
366config-targets := 0
367mixed-targets := 0
368dot-config := 1
369
370ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
371 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
372 dot-config := 0
373 endif
374endif
375
376ifeq ($(KBUILD_EXTMOD),)
377 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
378 config-targets := 1
379 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
380 mixed-targets := 1
381 endif
382 endif
383endif
384
385ifeq ($(mixed-targets),1)
386# ===========================================================================
387# We're called with mixed targets (*config and build targets).
388# Handle them one by one.
389
390%:: FORCE
391 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
392
393else
394ifeq ($(config-targets),1)
395# ===========================================================================
396# *config targets only - make sure prerequisites are updated, and descend
397# in scripts/kconfig to make the *config target
398
399# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
400# KBUILD_DEFCONFIG may point out an alternative default configuration
401# used for 'make defconfig'
402-include $(srctree)/arch/$(ARCH)/Makefile
403export KBUILD_DEFCONFIG
404
405config %config: scripts_basic outputmakefile FORCE
Denis Vlasenko665b02c2006-10-11 21:24:42 +0000406 $(Q)mkdir -p include
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000407 $(Q)$(MAKE) $(build)=scripts/kconfig $@
408 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= .kernelrelease
409
410else
411# ===========================================================================
412# Build targets only - this includes busybox, arch specific targets, clean
413# targets and others. In general all targets except *config targets.
414
415ifeq ($(KBUILD_EXTMOD),)
416# Additional helpers built in scripts/
417# Carefully list dependencies so we do not try to build scripts twice
418# in parrallel
419PHONY += scripts
420scripts: scripts_basic include/config/MARKER
421 $(Q)$(MAKE) $(build)=$(@)
422
423scripts_basic: include/autoconf.h
424
425# Objects we will link into busybox / subdirs we need to visit
426core-y := \
427 applets/ \
428
429libs-y := \
430 archival/ \
431 archival/libunarchive/ \
432 console-tools/ \
433 coreutils/ \
434 coreutils/libcoreutils/ \
435 debianutils/ \
436 e2fsprogs/ \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000437 editors/ \
438 findutils/ \
439 init/ \
Denis Vlasenko2856dab2007-04-01 01:18:20 +0000440 ipsvd/ \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000441 libbb/ \
442 libpwdgrp/ \
443 loginutils/ \
444 miscutils/ \
445 modutils/ \
446 networking/ \
447 networking/libiproute/ \
448 networking/udhcp/ \
449 procps/ \
450 runit/ \
Denis Vlasenkod46d3c22007-02-06 19:28:50 +0000451 selinux/ \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000452 shell/ \
453 sysklogd/ \
454 util-linux/ \
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000455 util-linux/volume_id/ \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000456
457endif # KBUILD_EXTMOD
458
459ifeq ($(dot-config),1)
Bernhard Reutner-Fischerdf100942006-03-13 19:04:00 +0000460# In this section, we need .config
Eric Andersen7daa0762004-10-08 07:46:08 +0000461
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000462# Read in dependencies to all Kconfig* files, make sure to run
463# oldconfig if changes are detected.
464-include .kconfig.d
Bernhard Reutner-Fischer5c071bc2005-10-05 07:40:46 +0000465
Denis Vlasenko8bf7bb82006-10-05 17:42:55 +0000466-include .config
Bernhard Reutner-Fischer7ca61b62006-01-15 14:04:57 +0000467
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000468# If .config needs to be updated, it will be done via the dependency
469# that autoconf has on .config.
470# To avoid any implicit rule to kick in, define an empty command
471.config .kconfig.d: ;
Bernhard Reutner-Fischer5d261262006-03-01 22:54:48 +0000472
Denis Vlasenkob54b2082006-10-27 09:05:40 +0000473# Now we can define CFLAGS etc according to .config
474include $(srctree)/Makefile.flags
475
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000476# If .config is newer than include/autoconf.h, someone tinkered
477# with it and forgot to run make oldconfig.
478# If kconfig.d is missing then we are probarly in a cleaned tree so
479# we execute the config step to be sure to catch updated Kconfig files
480include/autoconf.h: .kconfig.d .config
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000481 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
Bernhard Reutner-Fischerdf100942006-03-13 19:04:00 +0000482
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000483else
484# Dummy target needed, because used as prerequisite
485include/autoconf.h: ;
Bernhard Reutner-Fischer08c5a172006-01-25 15:58:04 +0000486endif
487
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000488# The all: target is the default when no target is given on the
489# command line.
490# This allow a user to issue only 'make' to build a kernel including modules
Mike Frysinger757ed502007-03-17 06:26:51 +0000491# Defaults busybox but it is usually overridden in the arch makefile
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000492all: busybox
493
494-include $(srctree)/arch/$(ARCH)/Makefile
495
496# arch Makefile may override CC so keep this after arch Makefile is included
497#bbox# NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
498CHECKFLAGS += $(NOSTDINC_FLAGS)
499
500# warn about C99 declaration after statement
501CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
502
503# disable pointer signedness warnings in gcc 4.0
504CFLAGS += $(call cc-option,-Wno-pointer-sign,)
505
506# Default kernel image to build when no specific target is given.
507# KBUILD_IMAGE may be overruled on the commandline or
508# set in the environment
509# Also any assignments in arch/$(ARCH)/Makefile take precedence over
510# this default value
511export KBUILD_IMAGE ?= busybox
512
513#
514# INSTALL_PATH specifies where to place the updated kernel and system map
515# images. Default is /boot, but you can set it to other values
516export INSTALL_PATH ?= /boot
517
518#
519# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
520# relocations required by build roots. This is not defined in the
521# makefile but the arguement can be passed to make if needed.
522#
523
524MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
525export MODLIB
526
527
528ifeq ($(KBUILD_EXTMOD),)
529busybox-dirs := $(patsubst %/,%,$(filter %/, $(core-y) $(core-m) $(libs-y) $(libs-m)))
530
531busybox-alldirs := $(sort $(busybox-dirs) $(patsubst %/,%,$(filter %/, \
532 $(core-n) $(core-) $(libs-n) $(libs-) \
533 )))
534
535core-y := $(patsubst %/, %/built-in.o, $(core-y))
536libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
537libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
538libs-y := $(libs-y1) $(libs-y2)
539
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000540# Build busybox
541# ---------------------------------------------------------------------------
542# busybox is build from the objects selected by $(busybox-init) and
543# $(busybox-main). Most are built-in.o files from top-level directories
544# in the kernel tree, others are specified in arch/$(ARCH)Makefile.
545# Ordering when linking is important, and $(busybox-init) must be first.
546#
547# busybox
548# ^
549# |
550# +-< $(busybox-init)
551# | +--< init/version.o + more
552# |
553# +--< $(busybox-main)
554# | +--< driver/built-in.o mm/built-in.o + more
555# |
556# +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
557#
558# busybox version (uname -v) cannot be updated during normal
559# descending-into-subdirs phase since we do not yet know if we need to
560# update busybox.
561# Therefore this step is delayed until just before final link of busybox -
562# except in the kallsyms case where it is done just before adding the
563# symbols to the kernel.
564#
565# System.map is generated to document addresses of all kernel symbols
566
567busybox-all := $(core-y) $(libs-y)
568
569# Rule to link busybox - also used during CONFIG_KALLSYMS
570# May be overridden by arch/$(ARCH)/Makefile
571quiet_cmd_busybox__ ?= LINK $@
Denis Vlasenko32404742007-10-07 17:05:22 +0000572 cmd_busybox__ ?= $(srctree)/scripts/trylink \
573 "$@" \
574 "$(CC)" \
Denis Vlasenkof1d93ec2008-02-14 12:24:14 +0000575 "$(CFLAGS)" \
Denis Vlasenko32404742007-10-07 17:05:22 +0000576 "$(LDFLAGS) $(EXTRA_LDFLAGS)" \
577 "$(core-y)" \
578 "$(libs-y)" \
579 "$(LDLIBS)"
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000580
581# Generate System.map
Denis Vlasenkof7996f32007-01-11 17:20:00 +0000582quiet_cmd_sysmap = SYSMAP
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000583 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
584
585# Link of busybox
586# If CONFIG_KALLSYMS is set .version is already updated
587# Generate System.map and verify that the content is consistent
588# Use + in front of the busybox_version rule to silent warning with make -j2
589# First command is ':' to allow us to use + in front of the rule
590define rule_busybox__
591 :
592 $(call cmd,busybox__)
593 $(Q)echo 'cmd_$@ := $(cmd_busybox__)' > $(@D)/.$(@F).cmd
594endef
595
596
597ifdef CONFIG_KALLSYMS
598# Generate section listing all symbols and add it into busybox $(kallsyms.o)
599# It's a three stage process:
600# o .tmp_busybox1 has all symbols and sections, but __kallsyms is
601# empty
602# Running kallsyms on that gives us .tmp_kallsyms1.o with
603# the right size - busybox version (uname -v) is updated during this step
604# o .tmp_busybox2 now has a __kallsyms section of the right size,
605# but due to the added section, some addresses have shifted.
606# From here, we generate a correct .tmp_kallsyms2.o
607# o The correct .tmp_kallsyms2.o is linked into the final busybox.
608# o Verify that the System.map from busybox matches the map from
609# .tmp_busybox2, just in case we did not generate kallsyms correctly.
610# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
611# .tmp_busybox3 and .tmp_kallsyms3.o. This is only meant as a
612# temporary bypass to allow the kernel to be built while the
613# maintainers work out what went wrong with kallsyms.
614
615ifdef CONFIG_KALLSYMS_EXTRA_PASS
616last_kallsyms := 3
617else
618last_kallsyms := 2
Bernhard Reutner-Fischer7ca61b62006-01-15 14:04:57 +0000619endif
Bernhard Reutner-Fischer7ca61b62006-01-15 14:04:57 +0000620
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000621kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
Bernhard Reutner-Fischer7ca61b62006-01-15 14:04:57 +0000622
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000623define verify_kallsyms
624 $(Q)$(if $($(quiet)cmd_sysmap), \
625 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
626 $(cmd_sysmap) .tmp_busybox$(last_kallsyms) .tmp_System.map
627 $(Q)cmp -s System.map .tmp_System.map || \
628 (echo Inconsistent kallsyms data; \
629 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
630 rm .tmp_kallsyms* ; /bin/false )
631endef
632
633# Update busybox version before link
634# Use + in front of this rule to silent warning about make -j1
635# First command is ':' to allow us to use + in front of this rule
636cmd_ksym_ld = $(cmd_busybox__)
637define rule_ksym_ld
Denis Vlasenkof7996f32007-01-11 17:20:00 +0000638 :
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000639 +$(call cmd,busybox_version)
640 $(call cmd,busybox__)
641 $(Q)echo 'cmd_$@ := $(cmd_busybox__)' > $(@D)/.$(@F).cmd
642endef
643
644# Generate .S file with all kernel symbols
645quiet_cmd_kallsyms = KSYM $@
646 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
647 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
648
649.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
650 $(call if_changed_dep,as_o_S)
651
652.tmp_kallsyms%.S: .tmp_busybox% $(KALLSYMS)
653 $(call cmd,kallsyms)
654
655# .tmp_busybox1 must be complete except kallsyms, so update busybox version
656.tmp_busybox1: $(busybox-lds) $(busybox-all) FORCE
657 $(call if_changed_rule,ksym_ld)
658
659.tmp_busybox2: $(busybox-lds) $(busybox-all) .tmp_kallsyms1.o FORCE
660 $(call if_changed,busybox__)
661
662.tmp_busybox3: $(busybox-lds) $(busybox-all) .tmp_kallsyms2.o FORCE
663 $(call if_changed,busybox__)
664
665# Needs to visit scripts/ before $(KALLSYMS) can be used.
666$(KALLSYMS): scripts ;
667
668# Generate some data for debugging strange kallsyms problems
669debug_kallsyms: .tmp_map$(last_kallsyms)
670
671.tmp_map%: .tmp_busybox% FORCE
672 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
673
674.tmp_map3: .tmp_map2
675
676.tmp_map2: .tmp_map1
677
678endif # ifdef CONFIG_KALLSYMS
679
680# busybox image - including updated kernel symbols
681busybox_unstripped: $(busybox-all) FORCE
682 $(call if_changed_rule,busybox__)
683 $(Q)rm -f .old_version
Bernhard Reutner-Fischercfc5d862006-03-02 09:44:32 +0000684
685busybox: busybox_unstripped
Mike Frysinger5b5bcf22007-06-19 15:58:02 +0000686ifeq ($(SKIP_STRIP),y)
687 $(Q)cp $< $@
688else
Denis Vlasenko4e33e072006-10-16 18:24:57 +0000689 $(Q)$(STRIP) -s --remove-section=.note --remove-section=.comment \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000690 busybox_unstripped -o $@
Mike Frysinger5b5bcf22007-06-19 15:58:02 +0000691endif
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000692
Denis Vlasenkof7996f32007-01-11 17:20:00 +0000693# The actual objects are generated when descending,
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000694# make sure no implicit rule kicks in
695$(sort $(busybox-all)): $(busybox-dirs) ;
Mike Frysinger586ea612006-04-21 01:18:07 +0000696
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000697# Handle descending into subdirectories listed in $(busybox-dirs)
698# Preset locale variables to speed up the build process. Limit locale
699# tweaks to this spot to avoid wrong language settings when running
700# make menuconfig etc.
701# Error messages still appears in the original language
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000702
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000703PHONY += $(busybox-dirs)
704$(busybox-dirs): prepare scripts
705 $(Q)$(MAKE) $(build)=$@
706
707# Build the kernel release string
708# The KERNELRELEASE is stored in a file named .kernelrelease
709# to be used when executing for example make install or make modules_install
710#
711# Take the contents of any files called localversion* and the config
712# variable CONFIG_LOCALVERSION and append them to KERNELRELEASE.
713# LOCALVERSION from the command line override all of this
714
715nullstring :=
716space := $(nullstring) # end of line
717
718___localver = $(objtree)/localversion* $(srctree)/localversion*
719__localver = $(sort $(wildcard $(___localver)))
720# skip backup files (containing '~')
721_localver = $(foreach f, $(__localver), $(if $(findstring ~, $(f)),,$(f)))
722
723localver = $(subst $(space),, \
724 $(shell cat /dev/null $(_localver)) \
725 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
Denis Vlasenkof7996f32007-01-11 17:20:00 +0000726
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000727# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
728# and if the SCM is know a tag from the SCM is appended.
729# The appended tag is determinded by the SCM used.
730#
731# Currently, only git is supported.
732# Other SCMs can edit scripts/setlocalversion and add the appropriate
733# checks as needed.
Mike Frysinger534b8d02008-02-07 22:44:27 +0000734ifdef _BB_DISABLED_CONFIG_LOCALVERSION_AUTO
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000735 _localver-auto = $(shell $(CONFIG_SHELL) \
736 $(srctree)/scripts/setlocalversion $(srctree))
737 localver-auto = $(LOCALVERSION)$(_localver-auto)
Eric Andersen13879102004-08-26 23:13:00 +0000738endif
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000739
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000740localver-full = $(localver)$(localver-auto)
Eric Andersen1f30a412002-04-13 13:39:48 +0000741
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000742# Store (new) KERNELRELASE string in .kernelrelease
743kernelrelease = $(KERNELVERSION)$(localver-full)
744.kernelrelease: FORCE
745 $(Q)rm -f $@
746 $(Q)echo $(kernelrelease) > $@
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000747
Rob Landleyd9872aa2006-05-27 21:24:16 +0000748
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000749# Things we need to do before we recursively start building the kernel
750# or the modules are listed in "prepare".
751# A multi level approach is used. prepareN is processed before prepareN-1.
752# archprepare is used in arch Makefiles and when processed asm symlink,
753# version.h and scripts_basic is processed / created.
Rob Landleyd9872aa2006-05-27 21:24:16 +0000754
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000755# Listed in dependency order
756PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
Rob Landley16890752005-09-02 00:41:53 +0000757
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000758# prepare-all is deprecated, use prepare as valid replacement
759PHONY += prepare-all
Rob Landleyd9872aa2006-05-27 21:24:16 +0000760
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000761# prepare3 is used to check if we are building in a separate output directory,
762# and if so do:
763# 1) Check that make has not been executed in the kernel src $(srctree)
764# 2) Create the include2 directory, used for the second asm symlink
765prepare3: .kernelrelease
766ifneq ($(KBUILD_SRC),)
Denis Vlasenkoff65cd42007-08-12 20:59:07 +0000767 @echo ' Using $(srctree) as source for busybox'
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000768 $(Q)if [ -f $(srctree)/.config ]; then \
769 echo " $(srctree) is not clean, please run 'make mrproper'";\
770 echo " in the '$(srctree)' directory.";\
771 /bin/false; \
Bernhard Reutner-Fischerdf100942006-03-13 19:04:00 +0000772 fi;
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000773 $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
774 $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
775endif
Eric Andersen85208e22002-04-12 12:05:57 +0000776
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000777# prepare2 creates a makefile if using a separate output directory
778prepare2: prepare3 outputmakefile
Eric Andersencc8ed391999-10-05 16:24:54 +0000779
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000780prepare1: prepare2 include/config/MARKER
781ifneq ($(KBUILD_MODULES),)
782 $(Q)mkdir -p $(MODVERDIR)
783 $(Q)rm -f $(MODVERDIR)/*
784endif
Eric Andersencc8ed391999-10-05 16:24:54 +0000785
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000786archprepare: prepare1 scripts_basic
Mark Whitleydd23b8b2000-07-10 23:00:47 +0000787
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000788prepare0: archprepare FORCE
789 $(Q)$(MAKE) $(build)=.
Matt Kraai4e05da82001-11-19 19:47:56 +0000790
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000791# All the preparing..
792prepare prepare-all: prepare0
Bernhard Reutner-Fischerfa61ca72006-06-16 17:19:39 +0000793
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000794# Leave this as default for preprocessing busybox.lds.S, which is now
795# done in arch/$(ARCH)/kernel/Makefile
796
797export CPPFLAGS_busybox.lds += -P -C -U$(ARCH)
798
799# FIXME: The asm symlink changes when $(ARCH) changes. That's
800# hard to detect, but I suppose "make mrproper" is a good idea
801# before switching between archs anyway.
802
803#bbox# include/asm:
804#bbox# @echo ' SYMLINK $@ -> include/asm-$(ARCH)'
805#bbox# $(Q)if [ ! -d include ]; then mkdir -p include; fi;
806#bbox# @ln -fsn asm-$(ARCH) $@
807
808# Split autoconf.h into include/linux/config/*
Mike Frysingerd514ba22006-12-31 11:46:19 +0000809quiet_cmd_gen_bbconfigopts = GEN include/bbconfigopts.h
810 cmd_gen_bbconfigopts = $(srctree)/scripts/mkconfigs > include/bbconfigopts.h
811quiet_cmd_split_autoconf = SPLIT include/autoconf.h -> include/config/*
812 cmd_split_autoconf = scripts/basic/split-include include/autoconf.h include/config
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000813#bbox# piggybacked generation of few .h files
814include/config/MARKER: scripts/basic/split-include include/autoconf.h
Mike Frysingerd514ba22006-12-31 11:46:19 +0000815 $(call cmd,split_autoconf)
816 $(call cmd,gen_bbconfigopts)
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000817 @touch $@
818
819# Generate some files
820# ---------------------------------------------------------------------------
821
822# KERNELRELEASE can change from a few different places, meaning version.h
823# needs to be updated, so this check is forced on all builds
824
825uts_len := 64
826
827define filechk_version.h
828 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
829 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
830 exit 1; \
831 fi; \
832 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
833 echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
834 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
835 )
836endef
837
838# ---------------------------------------------------------------------------
839
840PHONY += depend dep
841depend dep:
842 @echo '*** Warning: make $@ is unnecessary now.'
843
844# ---------------------------------------------------------------------------
845# Modules
846
Mike Frysinger61160dd2008-01-27 09:41:24 +0000847ifdef _BB_DISABLED_CONFIG_MODULES
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000848
849# By default, build modules as well
850
851all: modules
852
853# Build modules
854
855PHONY += modules
856modules: $(busybox-dirs) $(if $(KBUILD_BUILTIN),busybox)
857 @echo ' Building modules, stage 2.';
858 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
Bernhard Reutner-Fischerfa61ca72006-06-16 17:19:39 +0000859
Bernhard Reutner-Fischer07a79e72006-03-09 09:03:37 +0000860
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000861# Target to prepare building external modules
862PHONY += modules_prepare
863modules_prepare: prepare scripts
Bernhard Reutner-Fischerdf100942006-03-13 19:04:00 +0000864
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000865# Target to install modules
866PHONY += modules_install
867modules_install: _modinst_ _modinst_post
868
869PHONY += _modinst_
870_modinst_:
871 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
872 echo "Warning: you may need to install module-init-tools"; \
873 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
874 sleep 1; \
875 fi
876 @rm -rf $(MODLIB)/kernel
877 @rm -f $(MODLIB)/source
878 @mkdir -p $(MODLIB)/kernel
879 @ln -s $(srctree) $(MODLIB)/source
880 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
881 rm -f $(MODLIB)/build ; \
882 ln -s $(objtree) $(MODLIB)/build ; \
883 fi
884 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
885
886# If System.map exists, run depmod. This deliberately does not have a
887# dependency on System.map since that would run the dependency tree on
888# busybox. This depmod is only for convenience to give the initial
889# boot a modules.dep even before / is mounted read-write. However the
890# boot script depmod is the master version.
891ifeq "$(strip $(INSTALL_MOD_PATH))" ""
892depmod_opts :=
893else
894depmod_opts := -b $(INSTALL_MOD_PATH) -r
895endif
896PHONY += _modinst_post
897_modinst_post: _modinst_
898 if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
899
900else # CONFIG_MODULES
901
902# Modules not configured
903# ---------------------------------------------------------------------------
904
905modules modules_install: FORCE
906 @echo
Denis Vlasenkoeb98be02006-11-30 22:40:32 +0000907 @echo "The present busybox configuration has modules disabled."
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000908 @echo "Type 'make config' and enable loadable module support."
909 @echo "Then build a kernel with module support enabled."
910 @echo
911 @exit 1
912
913endif # CONFIG_MODULES
914
915###
916# Cleaning is done on three levels.
917# make clean Delete most generated files
918# Leave enough to build external modules
919# make mrproper Delete the current configuration, and all generated files
920# make distclean Remove editor backup files, patch leftover files and the like
921
922# Directories & files removed with 'make clean'
923CLEAN_DIRS += $(MODVERDIR)
Denis Vlasenko41e1dc32007-03-18 21:45:21 +0000924CLEAN_FILES += busybox* System.map .kernelrelease \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000925 .tmp_kallsyms* .tmp_version .tmp_busybox* .tmp_System.map
926
927# Directories & files removed with 'make mrproper'
928MRPROPER_DIRS += include/config include2
929MRPROPER_FILES += .config .config.old include/asm .version .old_version \
Denis Vlasenko8bf7bb82006-10-05 17:42:55 +0000930 include/autoconf.h \
931 include/bbconfigopts.h \
932 include/usage_compressed.h \
Denis Vlasenko1aa7e472007-11-28 06:49:03 +0000933 include/applet_tables.h \
934 applets/usage \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000935 .kernelrelease Module.symvers tags TAGS cscope*
936
937# clean - Delete most, but leave enough to build external modules
938#
939clean: rm-dirs := $(CLEAN_DIRS)
940clean: rm-files := $(CLEAN_FILES)
941clean-dirs := $(addprefix _clean_,$(srctree) $(busybox-alldirs))
942
943PHONY += $(clean-dirs) clean archclean
944$(clean-dirs):
945 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
946
947clean: archclean $(clean-dirs)
948 $(call cmd,rmdirs)
949 $(call cmd,rmfiles)
950 @find . $(RCS_FIND_IGNORE) \
951 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
952 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
953 -type f -print | xargs rm -f
954
955# mrproper - Delete all generated files, including .config
956#
957mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
958mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
Denis Vlasenko8bf7bb82006-10-05 17:42:55 +0000959mrproper-dirs := $(addprefix _mrproper_,scripts)
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000960
961PHONY += $(mrproper-dirs) mrproper archmrproper
962$(mrproper-dirs):
963 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
964
965mrproper: clean archmrproper $(mrproper-dirs)
966 $(call cmd,rmdirs)
967 $(call cmd,rmfiles)
968
969# distclean
970#
971PHONY += distclean
972
973distclean: mrproper
974 @find $(srctree) $(RCS_FIND_IGNORE) \
975 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
976 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
Denis Vlasenkoe9fd69c2007-10-08 22:16:14 +0000977 -o -name '.*.rej' -o -name '*.tmp' -o -size 0 \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000978 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
979 -type f -print | xargs rm -f
980
981
982# Packaging of the kernel to various formats
983# ---------------------------------------------------------------------------
984# rpm target kept for backward compatibility
985package-dir := $(srctree)/scripts/package
986
987%pkg: FORCE
988 $(Q)$(MAKE) $(build)=$(package-dir) $@
989rpm: FORCE
990 $(Q)$(MAKE) $(build)=$(package-dir) $@
991
992
993# Brief documentation of the typical targets used
994# ---------------------------------------------------------------------------
995
996boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
997boards := $(notdir $(boards))
998
Denis Vlasenko14aa9f72006-10-31 23:03:09 +0000999-include $(srctree)/Makefile.help
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001000
1001# Documentation targets
1002# ---------------------------------------------------------------------------
1003%docs: scripts_basic FORCE
1004 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1005
1006else # KBUILD_EXTMOD
1007
1008###
1009# External module support.
1010# When building external modules the kernel used as basis is considered
1011# read-only, and no consistency checks are made and the make
1012# system is not used on the basis kernel. If updates are required
1013# in the basis kernel ordinary make commands (without M=...) must
1014# be used.
1015#
1016# The following are the only valid targets when building external
1017# modules.
1018# make M=dir clean Delete all automatically generated files
1019# make M=dir modules Make all modules in specified dir
1020# make M=dir Same as 'make M=dir modules'
1021# make M=dir modules_install
1022# Install the modules build in the module directory
1023# Assumes install directory is already created
1024
1025# We are always building modules
1026KBUILD_MODULES := 1
1027PHONY += crmodverdir
1028crmodverdir:
1029 $(Q)mkdir -p $(MODVERDIR)
1030 $(Q)rm -f $(MODVERDIR)/*
1031
1032PHONY += $(objtree)/Module.symvers
1033$(objtree)/Module.symvers:
1034 @test -e $(objtree)/Module.symvers || ( \
1035 echo; \
1036 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1037 echo " is missing; modules will have no dependencies and modversions."; \
1038 echo )
1039
1040module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1041PHONY += $(module-dirs) modules
1042$(module-dirs): crmodverdir $(objtree)/Module.symvers
1043 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1044
1045modules: $(module-dirs)
1046 @echo ' Building modules, stage 2.';
1047 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1048
1049PHONY += modules_install
1050modules_install: _emodinst_ _emodinst_post
1051
1052install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1053PHONY += _emodinst_
1054_emodinst_:
1055 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1056 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
1057
1058# Run depmod only is we have System.map and depmod is executable
1059quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1060 cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \
1061 $(DEPMOD) -ae -F System.map \
1062 $(if $(strip $(INSTALL_MOD_PATH)), \
1063 -b $(INSTALL_MOD_PATH) -r) \
1064 $(KERNELRELEASE); \
1065 fi
1066
1067PHONY += _emodinst_post
1068_emodinst_post: _emodinst_
1069 $(call cmd,depmod)
1070
1071clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1072
1073PHONY += $(clean-dirs) clean
1074$(clean-dirs):
1075 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1076
1077clean: rm-dirs := $(MODVERDIR)
1078clean: $(clean-dirs)
1079 $(call cmd,rmdirs)
1080 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1081 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1082 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1083 -type f -print | xargs rm -f
1084
1085help:
1086 @echo ' Building external modules.'
1087 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1088 @echo ''
1089 @echo ' modules - default target, build the module(s)'
1090 @echo ' modules_install - install the module'
1091 @echo ' clean - remove generated files in module directory only'
1092 @echo ''
1093
1094# Dummies...
1095PHONY += prepare scripts
1096prepare: ;
1097scripts: ;
1098endif # KBUILD_EXTMOD
1099
1100# Generate tags for editors
1101# ---------------------------------------------------------------------------
1102
1103#We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1104#(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1105#Adding $(srctree) adds about 20M on i386 to the size of the output file!
1106
1107ifeq ($(src),$(obj))
1108__srctree =
1109else
1110__srctree = $(srctree)/
1111endif
1112
1113ifeq ($(ALLSOURCE_ARCHS),)
1114ifeq ($(ARCH),um)
1115ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1116else
1117ALLINCLUDE_ARCHS := $(ARCH)
1118endif
1119else
1120#Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1121ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1122endif
1123
1124ALLSOURCE_ARCHS := $(ARCH)
1125
1126define all-sources
1127 ( find $(__srctree) $(RCS_FIND_IGNORE) \
1128 \( -name include -o -name arch \) -prune -o \
1129 -name '*.[chS]' -print; \
1130 for ARCH in $(ALLSOURCE_ARCHS) ; do \
1131 find $(__srctree)arch/$${ARCH} $(RCS_FIND_IGNORE) \
1132 -name '*.[chS]' -print; \
1133 done ; \
1134 find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1135 -name '*.[chS]' -print; \
1136 find $(__srctree)include $(RCS_FIND_IGNORE) \
1137 \( -name config -o -name 'asm-*' \) -prune \
1138 -o -name '*.[chS]' -print; \
1139 for ARCH in $(ALLINCLUDE_ARCHS) ; do \
1140 find $(__srctree)include/asm-$${ARCH} $(RCS_FIND_IGNORE) \
1141 -name '*.[chS]' -print; \
1142 done ; \
1143 find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1144 -name '*.[chS]' -print )
1145endef
1146
1147quiet_cmd_cscope-file = FILELST cscope.files
1148 cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1149
1150quiet_cmd_cscope = MAKE cscope.out
1151 cmd_cscope = cscope -b
1152
1153cscope: FORCE
1154 $(call cmd,cscope-file)
1155 $(call cmd,cscope)
1156
1157quiet_cmd_TAGS = MAKE $@
1158define cmd_TAGS
1159 rm -f $@; \
1160 ETAGSF=`etags --version | grep -i exuberant >/dev/null && \
1161 echo "-I __initdata,__exitdata,__acquires,__releases \
1162 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1163 --extra=+f --c-kinds=+px"`; \
1164 $(all-sources) | xargs etags $$ETAGSF -a
1165endef
1166
1167TAGS: FORCE
1168 $(call cmd,TAGS)
1169
1170
1171quiet_cmd_tags = MAKE $@
1172define cmd_tags
1173 rm -f $@; \
1174 CTAGSF=`ctags --version | grep -i exuberant >/dev/null && \
1175 echo "-I __initdata,__exitdata,__acquires,__releases \
1176 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1177 --extra=+f --c-kinds=+px"`; \
1178 $(all-sources) | xargs ctags $$CTAGSF -a
1179endef
1180
1181tags: FORCE
1182 $(call cmd,tags)
1183
1184
1185# Scripts to check various things for consistency
1186# ---------------------------------------------------------------------------
1187
1188includecheck:
1189 find * $(RCS_FIND_IGNORE) \
1190 -name '*.[hcS]' -type f -print | sort \
1191 | xargs $(PERL) -w scripts/checkincludes.pl
1192
1193versioncheck:
1194 find * $(RCS_FIND_IGNORE) \
1195 -name '*.[hcS]' -type f -print | sort \
1196 | xargs $(PERL) -w scripts/checkversion.pl
1197
1198namespacecheck:
1199 $(PERL) $(srctree)/scripts/namespace.pl
1200
1201endif #ifeq ($(config-targets),1)
1202endif #ifeq ($(mixed-targets),1)
1203
1204PHONY += checkstack
1205checkstack:
1206 $(OBJDUMP) -d busybox $$(find . -name '*.ko') | \
1207 $(PERL) $(src)/scripts/checkstack.pl $(ARCH)
1208
1209kernelrelease:
1210 $(if $(wildcard .kernelrelease), $(Q)echo $(KERNELRELEASE), \
1211 $(error kernelrelease not valid - run 'make *config' to update it))
1212kernelversion:
1213 @echo $(KERNELVERSION)
1214
1215# Single targets
1216# ---------------------------------------------------------------------------
1217# Single targets are compatible with:
1218# - build whith mixed source and output
1219# - build with separate output dir 'make O=...'
1220# - external modules
1221#
1222# target-dir => where to store outputfile
1223# build-dir => directory in kernel source tree to use
1224
1225ifeq ($(KBUILD_EXTMOD),)
1226 build-dir = $(patsubst %/,%,$(dir $@))
1227 target-dir = $(dir $@)
1228else
1229 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1230 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1231 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1232endif
1233
1234%.s: %.c prepare scripts FORCE
1235 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1236%.i: %.c prepare scripts FORCE
1237 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1238%.o: %.c prepare scripts FORCE
1239 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1240%.lst: %.c prepare scripts FORCE
1241 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1242%.s: %.S prepare scripts FORCE
1243 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1244%.o: %.S prepare scripts FORCE
1245 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1246
1247# Modules
1248/ %/: prepare scripts FORCE
1249 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1250 $(build)=$(build-dir)
1251%.ko: prepare scripts FORCE
1252 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1253 $(build)=$(build-dir) $(@:.ko=.o)
1254 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1255
Denis Vlasenkof7996f32007-01-11 17:20:00 +00001256# FIXME Should go into a make.lib or something
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001257# ===========================================================================
1258
1259quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1260 cmd_rmdirs = rm -rf $(rm-dirs)
1261
1262quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1263 cmd_rmfiles = rm -f $(rm-files)
1264
1265
1266a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1267 $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1268 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
1269
1270quiet_cmd_as_o_S = AS $@
1271cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1272
1273# read all saved command lines
1274
1275targets := $(wildcard $(sort $(targets)))
1276cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1277
1278ifneq ($(cmd_files),)
1279 $(cmd_files): ; # Do not try to update included dependency files
1280 include $(cmd_files)
1281endif
1282
1283# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1284# Usage:
1285# $(Q)$(MAKE) $(clean)=dir
1286clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1287
1288endif # skip-makefile
1289
1290PHONY += FORCE
1291FORCE:
1292
Denis Vlasenko14aa9f72006-10-31 23:03:09 +00001293-include $(srctree)/Makefile.custom
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001294
1295# Declare the contents of the .PHONY variable as phony. We keep that
1296# information in a variable se we can use it in if_changed and friends.
1297.PHONY: $(PHONY)