blob: 6808e7d0fb1f6518979052cfa3b8a64df9f07f22 [file] [log] [blame]
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001VERSION = 1
Denis Vlasenko66dc9062007-08-24 11:05:49 +00002PATCHLEVEL = 8
Denis Vlasenkoa883fa42006-12-13 23:52:32 +00003SUBLEVEL = 0
Denis Vlasenkodd6e1f02007-06-02 12:54:09 +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/ \
455
456endif # KBUILD_EXTMOD
457
458ifeq ($(dot-config),1)
Bernhard Reutner-Fischerdf100942006-03-13 19:04:00 +0000459# In this section, we need .config
Eric Andersen7daa0762004-10-08 07:46:08 +0000460
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000461# Read in dependencies to all Kconfig* files, make sure to run
462# oldconfig if changes are detected.
463-include .kconfig.d
Bernhard Reutner-Fischer5c071bc2005-10-05 07:40:46 +0000464
Denis Vlasenko8bf7bb82006-10-05 17:42:55 +0000465-include .config
Bernhard Reutner-Fischer7ca61b62006-01-15 14:04:57 +0000466
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000467# If .config needs to be updated, it will be done via the dependency
468# that autoconf has on .config.
469# To avoid any implicit rule to kick in, define an empty command
470.config .kconfig.d: ;
Bernhard Reutner-Fischer5d261262006-03-01 22:54:48 +0000471
Denis Vlasenkob54b2082006-10-27 09:05:40 +0000472# Now we can define CFLAGS etc according to .config
473include $(srctree)/Makefile.flags
474
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000475# If .config is newer than include/autoconf.h, someone tinkered
476# with it and forgot to run make oldconfig.
477# If kconfig.d is missing then we are probarly in a cleaned tree so
478# we execute the config step to be sure to catch updated Kconfig files
479include/autoconf.h: .kconfig.d .config
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000480 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
Bernhard Reutner-Fischerdf100942006-03-13 19:04:00 +0000481
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000482else
483# Dummy target needed, because used as prerequisite
484include/autoconf.h: ;
Bernhard Reutner-Fischer08c5a172006-01-25 15:58:04 +0000485endif
486
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000487# The all: target is the default when no target is given on the
488# command line.
489# This allow a user to issue only 'make' to build a kernel including modules
Mike Frysinger757ed502007-03-17 06:26:51 +0000490# Defaults busybox but it is usually overridden in the arch makefile
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000491all: busybox
492
493-include $(srctree)/arch/$(ARCH)/Makefile
494
495# arch Makefile may override CC so keep this after arch Makefile is included
496#bbox# NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
497CHECKFLAGS += $(NOSTDINC_FLAGS)
498
499# warn about C99 declaration after statement
500CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
501
502# disable pointer signedness warnings in gcc 4.0
503CFLAGS += $(call cc-option,-Wno-pointer-sign,)
504
505# Default kernel image to build when no specific target is given.
506# KBUILD_IMAGE may be overruled on the commandline or
507# set in the environment
508# Also any assignments in arch/$(ARCH)/Makefile take precedence over
509# this default value
510export KBUILD_IMAGE ?= busybox
511
512#
513# INSTALL_PATH specifies where to place the updated kernel and system map
514# images. Default is /boot, but you can set it to other values
515export INSTALL_PATH ?= /boot
516
517#
518# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
519# relocations required by build roots. This is not defined in the
520# makefile but the arguement can be passed to make if needed.
521#
522
523MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
524export MODLIB
525
526
527ifeq ($(KBUILD_EXTMOD),)
528busybox-dirs := $(patsubst %/,%,$(filter %/, $(core-y) $(core-m) $(libs-y) $(libs-m)))
529
530busybox-alldirs := $(sort $(busybox-dirs) $(patsubst %/,%,$(filter %/, \
531 $(core-n) $(core-) $(libs-n) $(libs-) \
532 )))
533
534core-y := $(patsubst %/, %/built-in.o, $(core-y))
535libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
536libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
537libs-y := $(libs-y1) $(libs-y2)
538
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000539# Build busybox
540# ---------------------------------------------------------------------------
541# busybox is build from the objects selected by $(busybox-init) and
542# $(busybox-main). Most are built-in.o files from top-level directories
543# in the kernel tree, others are specified in arch/$(ARCH)Makefile.
544# Ordering when linking is important, and $(busybox-init) must be first.
545#
546# busybox
547# ^
548# |
549# +-< $(busybox-init)
550# | +--< init/version.o + more
551# |
552# +--< $(busybox-main)
553# | +--< driver/built-in.o mm/built-in.o + more
554# |
555# +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
556#
557# busybox version (uname -v) cannot be updated during normal
558# descending-into-subdirs phase since we do not yet know if we need to
559# update busybox.
560# Therefore this step is delayed until just before final link of busybox -
561# except in the kallsyms case where it is done just before adding the
562# symbols to the kernel.
563#
564# System.map is generated to document addresses of all kernel symbols
565
566busybox-all := $(core-y) $(libs-y)
567
568# Rule to link busybox - also used during CONFIG_KALLSYMS
569# May be overridden by arch/$(ARCH)/Makefile
570quiet_cmd_busybox__ ?= LINK $@
Denis Vlasenko32404742007-10-07 17:05:22 +0000571 cmd_busybox__ ?= $(srctree)/scripts/trylink \
572 "$@" \
573 "$(CC)" \
574 "$(LDFLAGS) $(EXTRA_LDFLAGS)" \
575 "$(core-y)" \
576 "$(libs-y)" \
577 "$(LDLIBS)"
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000578
579# Generate System.map
Denis Vlasenkof7996f32007-01-11 17:20:00 +0000580quiet_cmd_sysmap = SYSMAP
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000581 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 = $(cmd_busybox__)
635define rule_ksym_ld
Denis Vlasenkof7996f32007-01-11 17:20:00 +0000636 :
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000637 +$(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 $(Q)rm -f .old_version
Bernhard Reutner-Fischercfc5d862006-03-02 09:44:32 +0000682
683busybox: busybox_unstripped
Mike Frysinger5b5bcf22007-06-19 15:58:02 +0000684ifeq ($(SKIP_STRIP),y)
685 $(Q)cp $< $@
686else
Denis Vlasenko4e33e072006-10-16 18:24:57 +0000687 $(Q)$(STRIP) -s --remove-section=.note --remove-section=.comment \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000688 busybox_unstripped -o $@
Mike Frysinger5b5bcf22007-06-19 15:58:02 +0000689endif
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000690
Denis Vlasenkof7996f32007-01-11 17:20:00 +0000691# The actual objects are generated when descending,
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000692# make sure no implicit rule kicks in
693$(sort $(busybox-all)): $(busybox-dirs) ;
Mike Frysinger586ea612006-04-21 01:18:07 +0000694
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000695# Handle descending into subdirectories listed in $(busybox-dirs)
696# Preset locale variables to speed up the build process. Limit locale
697# tweaks to this spot to avoid wrong language settings when running
698# make menuconfig etc.
699# Error messages still appears in the original language
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000700
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000701PHONY += $(busybox-dirs)
702$(busybox-dirs): prepare scripts
703 $(Q)$(MAKE) $(build)=$@
704
705# Build the kernel release string
706# The KERNELRELEASE is stored in a file named .kernelrelease
707# to be used when executing for example make install or make modules_install
708#
709# Take the contents of any files called localversion* and the config
710# variable CONFIG_LOCALVERSION and append them to KERNELRELEASE.
711# LOCALVERSION from the command line override all of this
712
713nullstring :=
714space := $(nullstring) # end of line
715
716___localver = $(objtree)/localversion* $(srctree)/localversion*
717__localver = $(sort $(wildcard $(___localver)))
718# skip backup files (containing '~')
719_localver = $(foreach f, $(__localver), $(if $(findstring ~, $(f)),,$(f)))
720
721localver = $(subst $(space),, \
722 $(shell cat /dev/null $(_localver)) \
723 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
Denis Vlasenkof7996f32007-01-11 17:20:00 +0000724
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000725# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
726# and if the SCM is know a tag from the SCM is appended.
727# The appended tag is determinded by the SCM used.
728#
729# Currently, only git is supported.
730# Other SCMs can edit scripts/setlocalversion and add the appropriate
731# checks as needed.
732ifdef CONFIG_LOCALVERSION_AUTO
733 _localver-auto = $(shell $(CONFIG_SHELL) \
734 $(srctree)/scripts/setlocalversion $(srctree))
735 localver-auto = $(LOCALVERSION)$(_localver-auto)
Eric Andersen13879102004-08-26 23:13:00 +0000736endif
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000737
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000738localver-full = $(localver)$(localver-auto)
Eric Andersen1f30a412002-04-13 13:39:48 +0000739
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000740# Store (new) KERNELRELASE string in .kernelrelease
741kernelrelease = $(KERNELVERSION)$(localver-full)
742.kernelrelease: FORCE
743 $(Q)rm -f $@
744 $(Q)echo $(kernelrelease) > $@
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000745
Rob Landleyd9872aa2006-05-27 21:24:16 +0000746
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000747# Things we need to do before we recursively start building the kernel
748# or the modules are listed in "prepare".
749# A multi level approach is used. prepareN is processed before prepareN-1.
750# archprepare is used in arch Makefiles and when processed asm symlink,
751# version.h and scripts_basic is processed / created.
Rob Landleyd9872aa2006-05-27 21:24:16 +0000752
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000753# Listed in dependency order
754PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
Rob Landley16890752005-09-02 00:41:53 +0000755
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000756# prepare-all is deprecated, use prepare as valid replacement
757PHONY += prepare-all
Rob Landleyd9872aa2006-05-27 21:24:16 +0000758
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000759# prepare3 is used to check if we are building in a separate output directory,
760# and if so do:
761# 1) Check that make has not been executed in the kernel src $(srctree)
762# 2) Create the include2 directory, used for the second asm symlink
763prepare3: .kernelrelease
764ifneq ($(KBUILD_SRC),)
Denis Vlasenkoff65cd42007-08-12 20:59:07 +0000765 @echo ' Using $(srctree) as source for busybox'
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000766 $(Q)if [ -f $(srctree)/.config ]; then \
767 echo " $(srctree) is not clean, please run 'make mrproper'";\
768 echo " in the '$(srctree)' directory.";\
769 /bin/false; \
Bernhard Reutner-Fischerdf100942006-03-13 19:04:00 +0000770 fi;
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000771 $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
772 $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
773endif
Eric Andersen85208e22002-04-12 12:05:57 +0000774
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000775# prepare2 creates a makefile if using a separate output directory
776prepare2: prepare3 outputmakefile
Eric Andersencc8ed391999-10-05 16:24:54 +0000777
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000778prepare1: prepare2 include/config/MARKER
779ifneq ($(KBUILD_MODULES),)
780 $(Q)mkdir -p $(MODVERDIR)
781 $(Q)rm -f $(MODVERDIR)/*
782endif
Eric Andersencc8ed391999-10-05 16:24:54 +0000783
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000784archprepare: prepare1 scripts_basic
Mark Whitleydd23b8b2000-07-10 23:00:47 +0000785
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000786prepare0: archprepare FORCE
787 $(Q)$(MAKE) $(build)=.
Matt Kraai4e05da82001-11-19 19:47:56 +0000788
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000789# All the preparing..
790prepare prepare-all: prepare0
Bernhard Reutner-Fischerfa61ca72006-06-16 17:19:39 +0000791
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000792# Leave this as default for preprocessing busybox.lds.S, which is now
793# done in arch/$(ARCH)/kernel/Makefile
794
795export CPPFLAGS_busybox.lds += -P -C -U$(ARCH)
796
797# FIXME: The asm symlink changes when $(ARCH) changes. That's
798# hard to detect, but I suppose "make mrproper" is a good idea
799# before switching between archs anyway.
800
801#bbox# include/asm:
802#bbox# @echo ' SYMLINK $@ -> include/asm-$(ARCH)'
803#bbox# $(Q)if [ ! -d include ]; then mkdir -p include; fi;
804#bbox# @ln -fsn asm-$(ARCH) $@
805
806# Split autoconf.h into include/linux/config/*
Mike Frysingerd514ba22006-12-31 11:46:19 +0000807quiet_cmd_gen_bbconfigopts = GEN include/bbconfigopts.h
808 cmd_gen_bbconfigopts = $(srctree)/scripts/mkconfigs > include/bbconfigopts.h
809quiet_cmd_split_autoconf = SPLIT include/autoconf.h -> include/config/*
810 cmd_split_autoconf = scripts/basic/split-include include/autoconf.h include/config
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000811#bbox# piggybacked generation of few .h files
812include/config/MARKER: scripts/basic/split-include include/autoconf.h
Mike Frysingerd514ba22006-12-31 11:46:19 +0000813 $(call cmd,split_autoconf)
814 $(call cmd,gen_bbconfigopts)
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000815 @touch $@
816
817# Generate some files
818# ---------------------------------------------------------------------------
819
820# KERNELRELEASE can change from a few different places, meaning version.h
821# needs to be updated, so this check is forced on all builds
822
823uts_len := 64
824
825define filechk_version.h
826 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
827 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
828 exit 1; \
829 fi; \
830 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
831 echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
832 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
833 )
834endef
835
836# ---------------------------------------------------------------------------
837
838PHONY += depend dep
839depend dep:
840 @echo '*** Warning: make $@ is unnecessary now.'
841
842# ---------------------------------------------------------------------------
843# Modules
844
845ifdef CONFIG_MODULES
846
847# By default, build modules as well
848
849all: modules
850
851# Build modules
852
853PHONY += modules
854modules: $(busybox-dirs) $(if $(KBUILD_BUILTIN),busybox)
855 @echo ' Building modules, stage 2.';
856 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
Bernhard Reutner-Fischerfa61ca72006-06-16 17:19:39 +0000857
Bernhard Reutner-Fischer07a79e72006-03-09 09:03:37 +0000858
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000859# Target to prepare building external modules
860PHONY += modules_prepare
861modules_prepare: prepare scripts
Bernhard Reutner-Fischerdf100942006-03-13 19:04:00 +0000862
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000863# Target to install modules
864PHONY += modules_install
865modules_install: _modinst_ _modinst_post
866
867PHONY += _modinst_
868_modinst_:
869 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
870 echo "Warning: you may need to install module-init-tools"; \
871 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
872 sleep 1; \
873 fi
874 @rm -rf $(MODLIB)/kernel
875 @rm -f $(MODLIB)/source
876 @mkdir -p $(MODLIB)/kernel
877 @ln -s $(srctree) $(MODLIB)/source
878 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
879 rm -f $(MODLIB)/build ; \
880 ln -s $(objtree) $(MODLIB)/build ; \
881 fi
882 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
883
884# If System.map exists, run depmod. This deliberately does not have a
885# dependency on System.map since that would run the dependency tree on
886# busybox. This depmod is only for convenience to give the initial
887# boot a modules.dep even before / is mounted read-write. However the
888# boot script depmod is the master version.
889ifeq "$(strip $(INSTALL_MOD_PATH))" ""
890depmod_opts :=
891else
892depmod_opts := -b $(INSTALL_MOD_PATH) -r
893endif
894PHONY += _modinst_post
895_modinst_post: _modinst_
896 if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
897
898else # CONFIG_MODULES
899
900# Modules not configured
901# ---------------------------------------------------------------------------
902
903modules modules_install: FORCE
904 @echo
Denis Vlasenkoeb98be02006-11-30 22:40:32 +0000905 @echo "The present busybox configuration has modules disabled."
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000906 @echo "Type 'make config' and enable loadable module support."
907 @echo "Then build a kernel with module support enabled."
908 @echo
909 @exit 1
910
911endif # CONFIG_MODULES
912
913###
914# Cleaning is done on three levels.
915# make clean Delete most generated files
916# Leave enough to build external modules
917# make mrproper Delete the current configuration, and all generated files
918# make distclean Remove editor backup files, patch leftover files and the like
919
920# Directories & files removed with 'make clean'
921CLEAN_DIRS += $(MODVERDIR)
Denis Vlasenko41e1dc32007-03-18 21:45:21 +0000922CLEAN_FILES += busybox* System.map .kernelrelease \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000923 .tmp_kallsyms* .tmp_version .tmp_busybox* .tmp_System.map
924
925# Directories & files removed with 'make mrproper'
926MRPROPER_DIRS += include/config include2
927MRPROPER_FILES += .config .config.old include/asm .version .old_version \
Denis Vlasenko8bf7bb82006-10-05 17:42:55 +0000928 include/autoconf.h \
929 include/bbconfigopts.h \
930 include/usage_compressed.h \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000931 .kernelrelease Module.symvers tags TAGS cscope*
932
933# clean - Delete most, but leave enough to build external modules
934#
935clean: rm-dirs := $(CLEAN_DIRS)
936clean: rm-files := $(CLEAN_FILES)
937clean-dirs := $(addprefix _clean_,$(srctree) $(busybox-alldirs))
938
939PHONY += $(clean-dirs) clean archclean
940$(clean-dirs):
941 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
942
943clean: archclean $(clean-dirs)
944 $(call cmd,rmdirs)
945 $(call cmd,rmfiles)
946 @find . $(RCS_FIND_IGNORE) \
947 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
948 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
949 -type f -print | xargs rm -f
950
951# mrproper - Delete all generated files, including .config
952#
953mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
954mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
Denis Vlasenko8bf7bb82006-10-05 17:42:55 +0000955mrproper-dirs := $(addprefix _mrproper_,scripts)
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000956
957PHONY += $(mrproper-dirs) mrproper archmrproper
958$(mrproper-dirs):
959 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
960
961mrproper: clean archmrproper $(mrproper-dirs)
962 $(call cmd,rmdirs)
963 $(call cmd,rmfiles)
964
965# distclean
966#
967PHONY += distclean
968
969distclean: mrproper
970 @find $(srctree) $(RCS_FIND_IGNORE) \
971 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
972 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
Denis Vlasenkoe9fd69c2007-10-08 22:16:14 +0000973 -o -name '.*.rej' -o -name '*.tmp' -o -size 0 \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000974 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
975 -type f -print | xargs rm -f
976
977
978# Packaging of the kernel to various formats
979# ---------------------------------------------------------------------------
980# rpm target kept for backward compatibility
981package-dir := $(srctree)/scripts/package
982
983%pkg: FORCE
984 $(Q)$(MAKE) $(build)=$(package-dir) $@
985rpm: FORCE
986 $(Q)$(MAKE) $(build)=$(package-dir) $@
987
988
989# Brief documentation of the typical targets used
990# ---------------------------------------------------------------------------
991
992boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
993boards := $(notdir $(boards))
994
Denis Vlasenko14aa9f72006-10-31 23:03:09 +0000995-include $(srctree)/Makefile.help
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000996
997# Documentation targets
998# ---------------------------------------------------------------------------
999%docs: scripts_basic FORCE
1000 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1001
1002else # KBUILD_EXTMOD
1003
1004###
1005# External module support.
1006# When building external modules the kernel used as basis is considered
1007# read-only, and no consistency checks are made and the make
1008# system is not used on the basis kernel. If updates are required
1009# in the basis kernel ordinary make commands (without M=...) must
1010# be used.
1011#
1012# The following are the only valid targets when building external
1013# modules.
1014# make M=dir clean Delete all automatically generated files
1015# make M=dir modules Make all modules in specified dir
1016# make M=dir Same as 'make M=dir modules'
1017# make M=dir modules_install
1018# Install the modules build in the module directory
1019# Assumes install directory is already created
1020
1021# We are always building modules
1022KBUILD_MODULES := 1
1023PHONY += crmodverdir
1024crmodverdir:
1025 $(Q)mkdir -p $(MODVERDIR)
1026 $(Q)rm -f $(MODVERDIR)/*
1027
1028PHONY += $(objtree)/Module.symvers
1029$(objtree)/Module.symvers:
1030 @test -e $(objtree)/Module.symvers || ( \
1031 echo; \
1032 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1033 echo " is missing; modules will have no dependencies and modversions."; \
1034 echo )
1035
1036module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1037PHONY += $(module-dirs) modules
1038$(module-dirs): crmodverdir $(objtree)/Module.symvers
1039 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1040
1041modules: $(module-dirs)
1042 @echo ' Building modules, stage 2.';
1043 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1044
1045PHONY += modules_install
1046modules_install: _emodinst_ _emodinst_post
1047
1048install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1049PHONY += _emodinst_
1050_emodinst_:
1051 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1052 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
1053
1054# Run depmod only is we have System.map and depmod is executable
1055quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1056 cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \
1057 $(DEPMOD) -ae -F System.map \
1058 $(if $(strip $(INSTALL_MOD_PATH)), \
1059 -b $(INSTALL_MOD_PATH) -r) \
1060 $(KERNELRELEASE); \
1061 fi
1062
1063PHONY += _emodinst_post
1064_emodinst_post: _emodinst_
1065 $(call cmd,depmod)
1066
1067clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1068
1069PHONY += $(clean-dirs) clean
1070$(clean-dirs):
1071 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1072
1073clean: rm-dirs := $(MODVERDIR)
1074clean: $(clean-dirs)
1075 $(call cmd,rmdirs)
1076 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1077 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1078 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1079 -type f -print | xargs rm -f
1080
1081help:
1082 @echo ' Building external modules.'
1083 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1084 @echo ''
1085 @echo ' modules - default target, build the module(s)'
1086 @echo ' modules_install - install the module'
1087 @echo ' clean - remove generated files in module directory only'
1088 @echo ''
1089
1090# Dummies...
1091PHONY += prepare scripts
1092prepare: ;
1093scripts: ;
1094endif # KBUILD_EXTMOD
1095
1096# Generate tags for editors
1097# ---------------------------------------------------------------------------
1098
1099#We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1100#(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1101#Adding $(srctree) adds about 20M on i386 to the size of the output file!
1102
1103ifeq ($(src),$(obj))
1104__srctree =
1105else
1106__srctree = $(srctree)/
1107endif
1108
1109ifeq ($(ALLSOURCE_ARCHS),)
1110ifeq ($(ARCH),um)
1111ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1112else
1113ALLINCLUDE_ARCHS := $(ARCH)
1114endif
1115else
1116#Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1117ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1118endif
1119
1120ALLSOURCE_ARCHS := $(ARCH)
1121
1122define all-sources
1123 ( find $(__srctree) $(RCS_FIND_IGNORE) \
1124 \( -name include -o -name arch \) -prune -o \
1125 -name '*.[chS]' -print; \
1126 for ARCH in $(ALLSOURCE_ARCHS) ; do \
1127 find $(__srctree)arch/$${ARCH} $(RCS_FIND_IGNORE) \
1128 -name '*.[chS]' -print; \
1129 done ; \
1130 find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1131 -name '*.[chS]' -print; \
1132 find $(__srctree)include $(RCS_FIND_IGNORE) \
1133 \( -name config -o -name 'asm-*' \) -prune \
1134 -o -name '*.[chS]' -print; \
1135 for ARCH in $(ALLINCLUDE_ARCHS) ; do \
1136 find $(__srctree)include/asm-$${ARCH} $(RCS_FIND_IGNORE) \
1137 -name '*.[chS]' -print; \
1138 done ; \
1139 find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1140 -name '*.[chS]' -print )
1141endef
1142
1143quiet_cmd_cscope-file = FILELST cscope.files
1144 cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1145
1146quiet_cmd_cscope = MAKE cscope.out
1147 cmd_cscope = cscope -b
1148
1149cscope: FORCE
1150 $(call cmd,cscope-file)
1151 $(call cmd,cscope)
1152
1153quiet_cmd_TAGS = MAKE $@
1154define cmd_TAGS
1155 rm -f $@; \
1156 ETAGSF=`etags --version | grep -i exuberant >/dev/null && \
1157 echo "-I __initdata,__exitdata,__acquires,__releases \
1158 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1159 --extra=+f --c-kinds=+px"`; \
1160 $(all-sources) | xargs etags $$ETAGSF -a
1161endef
1162
1163TAGS: FORCE
1164 $(call cmd,TAGS)
1165
1166
1167quiet_cmd_tags = MAKE $@
1168define cmd_tags
1169 rm -f $@; \
1170 CTAGSF=`ctags --version | grep -i exuberant >/dev/null && \
1171 echo "-I __initdata,__exitdata,__acquires,__releases \
1172 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1173 --extra=+f --c-kinds=+px"`; \
1174 $(all-sources) | xargs ctags $$CTAGSF -a
1175endef
1176
1177tags: FORCE
1178 $(call cmd,tags)
1179
1180
1181# Scripts to check various things for consistency
1182# ---------------------------------------------------------------------------
1183
1184includecheck:
1185 find * $(RCS_FIND_IGNORE) \
1186 -name '*.[hcS]' -type f -print | sort \
1187 | xargs $(PERL) -w scripts/checkincludes.pl
1188
1189versioncheck:
1190 find * $(RCS_FIND_IGNORE) \
1191 -name '*.[hcS]' -type f -print | sort \
1192 | xargs $(PERL) -w scripts/checkversion.pl
1193
1194namespacecheck:
1195 $(PERL) $(srctree)/scripts/namespace.pl
1196
1197endif #ifeq ($(config-targets),1)
1198endif #ifeq ($(mixed-targets),1)
1199
1200PHONY += checkstack
1201checkstack:
1202 $(OBJDUMP) -d busybox $$(find . -name '*.ko') | \
1203 $(PERL) $(src)/scripts/checkstack.pl $(ARCH)
1204
1205kernelrelease:
1206 $(if $(wildcard .kernelrelease), $(Q)echo $(KERNELRELEASE), \
1207 $(error kernelrelease not valid - run 'make *config' to update it))
1208kernelversion:
1209 @echo $(KERNELVERSION)
1210
1211# Single targets
1212# ---------------------------------------------------------------------------
1213# Single targets are compatible with:
1214# - build whith mixed source and output
1215# - build with separate output dir 'make O=...'
1216# - external modules
1217#
1218# target-dir => where to store outputfile
1219# build-dir => directory in kernel source tree to use
1220
1221ifeq ($(KBUILD_EXTMOD),)
1222 build-dir = $(patsubst %/,%,$(dir $@))
1223 target-dir = $(dir $@)
1224else
1225 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1226 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1227 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1228endif
1229
1230%.s: %.c prepare scripts FORCE
1231 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1232%.i: %.c prepare scripts FORCE
1233 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1234%.o: %.c prepare scripts FORCE
1235 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1236%.lst: %.c prepare scripts FORCE
1237 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1238%.s: %.S prepare scripts FORCE
1239 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1240%.o: %.S prepare scripts FORCE
1241 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1242
1243# Modules
1244/ %/: prepare scripts FORCE
1245 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1246 $(build)=$(build-dir)
1247%.ko: prepare scripts FORCE
1248 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1249 $(build)=$(build-dir) $(@:.ko=.o)
1250 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1251
Denis Vlasenkof7996f32007-01-11 17:20:00 +00001252# FIXME Should go into a make.lib or something
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001253# ===========================================================================
1254
1255quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1256 cmd_rmdirs = rm -rf $(rm-dirs)
1257
1258quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1259 cmd_rmfiles = rm -f $(rm-files)
1260
1261
1262a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1263 $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1264 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
1265
1266quiet_cmd_as_o_S = AS $@
1267cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1268
1269# read all saved command lines
1270
1271targets := $(wildcard $(sort $(targets)))
1272cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1273
1274ifneq ($(cmd_files),)
1275 $(cmd_files): ; # Do not try to update included dependency files
1276 include $(cmd_files)
1277endif
1278
1279# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1280# Usage:
1281# $(Q)$(MAKE) $(clean)=dir
1282clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1283
1284endif # skip-makefile
1285
1286PHONY += FORCE
1287FORCE:
1288
Denis Vlasenko14aa9f72006-10-31 23:03:09 +00001289-include $(srctree)/Makefile.custom
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001290
1291# Declare the contents of the .PHONY variable as phony. We keep that
1292# information in a variable se we can use it in if_changed and friends.
1293.PHONY: $(PHONY)