blob: dab807805457dcb9b2c532ea658c093449c09f12 [file] [log] [blame]
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001VERSION = 1
Denys Vlasenko966423d2015-10-12 14:33:46 +02002PATCHLEVEL = 25
Denis Vlasenkoa883fa42006-12-13 23:52:32 +00003SUBLEVEL = 0
Denys Vlasenko966423d2015-10-12 14:33:46 +02004EXTRAVERSION = .git
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# Cross compiling and selecting different set of gcc/bin-utils
Bernhard Reutner-Fischer5c071bc2005-10-05 07:40:46 +0000146# ---------------------------------------------------------------------------
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000147#
148# When performing cross compilation for other architectures ARCH shall be set
149# to the target architecture. (See arch/* for the possibilities).
150# ARCH can be set during invocation of make:
151# make ARCH=ia64
152# Another way is to have ARCH set in the environment.
153# The default ARCH is the host where make is executed.
Bernhard Reutner-Fischer5c071bc2005-10-05 07:40:46 +0000154
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000155# CROSS_COMPILE specify the prefix used for all executables used
156# during compilation. Only gcc and related bin-utils executables
157# are prefixed with $(CROSS_COMPILE).
158# CROSS_COMPILE can be set on the command line
159# make CROSS_COMPILE=ia64-linux-
160# Alternatively CROSS_COMPILE can be set in the environment.
161# Default value for CROSS_COMPILE is not to prefix executables
162# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
Bernhard Reutner-Fischer5c071bc2005-10-05 07:40:46 +0000163
Denis Vlasenko630a7f72008-06-02 22:24:34 +0000164CROSS_COMPILE ?=
Denis Vlasenkob8e653b2008-06-02 04:51:29 +0000165# bbox: we may have CONFIG_CROSS_COMPILER_PREFIX in .config,
166# and it has not been included yet... thus using an awkward syntax.
167ifeq ($(CROSS_COMPILE),)
168CROSS_COMPILE := $(shell grep ^CONFIG_CROSS_COMPILER_PREFIX .config 2>/dev/null)
169CROSS_COMPILE := $(subst CONFIG_CROSS_COMPILER_PREFIX=,,$(CROSS_COMPILE))
170CROSS_COMPILE := $(subst ",,$(CROSS_COMPILE))
Bernhard Reutner-Fischera7542dd2009-01-27 18:54:41 +0000171#")
Denis Vlasenkob8e653b2008-06-02 04:51:29 +0000172endif
173
174# SUBARCH tells the usermode build what the underlying arch is. That is set
175# first, and if a usermode build is happening, the "ARCH=um" on the command
176# line overrides the setting of ARCH below. If a native build is happening,
177# then ARCH is assigned, getting whatever value it gets normally, and
178# SUBARCH is subsequently ignored.
179
180ifneq ($(CROSS_COMPILE),)
181SUBARCH := $(shell echo $(CROSS_COMPILE) | cut -d- -f1)
182else
183SUBARCH := $(shell uname -m)
184endif
185SUBARCH := $(shell echo $(SUBARCH) | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
186 -e s/arm.*/arm/ -e s/sa110/arm/ \
187 -e s/s390x/s390/ -e s/parisc64/parisc/ \
188 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ )
189
Denis Vlasenko630a7f72008-06-02 22:24:34 +0000190ARCH ?= $(SUBARCH)
Bernhard Reutner-Fischer5c071bc2005-10-05 07:40:46 +0000191
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000192# Architecture as present in compile.h
193UTS_MACHINE := $(ARCH)
Bernhard Reutner-Fischer5c071bc2005-10-05 07:40:46 +0000194
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000195# SHELL used by kbuild
196CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
197 else if [ -x /bin/bash ]; then echo /bin/bash; \
198 else echo sh; fi ; fi)
Bernhard Reutner-Fischer5c071bc2005-10-05 07:40:46 +0000199
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000200# Decide whether to build built-in, modular, or both.
201# Normally, just do built-in.
Bernhard Reutner-Fischer5c071bc2005-10-05 07:40:46 +0000202
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000203KBUILD_MODULES :=
204KBUILD_BUILTIN := 1
Bernhard Reutner-Fischer5c071bc2005-10-05 07:40:46 +0000205
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000206# If we have only "make modules", don't compile built-in objects.
207# When we're building modules with modversions, we need to consider
208# the built-in objects during the descend as well, in order to
209# make sure the checksums are uptodate before we record them.
Bernhard Reutner-Fischer5c071bc2005-10-05 07:40:46 +0000210
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000211ifeq ($(MAKECMDGOALS),modules)
212 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
213endif
Rob Landleya167ec52006-01-31 02:42:50 +0000214
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000215# If we have "make <whatever> modules", compile modules
216# in addition to whatever we do anyway.
217# Just "make" or "make all" shall build modules as well
218
219ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
220 KBUILD_MODULES := 1
221endif
222
223ifeq ($(MAKECMDGOALS),)
224 KBUILD_MODULES := 1
225endif
226
227export KBUILD_MODULES KBUILD_BUILTIN
228export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
229
230# Beautify output
231# ---------------------------------------------------------------------------
232#
233# Normally, we echo the whole command before executing it. By making
234# that echo $($(quiet)$(cmd)), we now have the possibility to set
235# $(quiet) to choose other forms of output instead, e.g.
236#
237# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
238# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
239#
240# If $(quiet) is empty, the whole command will be printed.
Denis Vlasenkof7996f32007-01-11 17:20:00 +0000241# If it is set to "quiet_", only the short version will be printed.
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000242# If it is set to "silent_", nothing wil be printed at all, since
243# the variable $(silent_cmd_cc_o_c) doesn't exist.
244#
245# A simple variant is to prefix commands with $(Q) - that's useful
246# for commands that shall be hidden in non-verbose mode.
247#
248# $(Q)ln $@ :<
249#
250# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
251# If KBUILD_VERBOSE equals 1 then the above command is displayed.
252
253ifeq ($(KBUILD_VERBOSE),1)
254 quiet =
255 Q =
256else
257 quiet=quiet_
258 Q = @
259endif
260
261# If the user is running make -s (silent mode), suppress echoing of
262# commands
263
264ifneq ($(findstring s,$(MAKEFLAGS)),)
265 quiet=silent_
266endif
267
268export quiet Q KBUILD_VERBOSE
Rob Landleya167ec52006-01-31 02:42:50 +0000269
Bernhard Reutner-Fischerdf100942006-03-13 19:04:00 +0000270
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000271# Look for make include files relative to root of kernel src
272MAKEFLAGS += --include-dir=$(srctree)
Bernhard Reutner-Fischera9d89132005-10-07 18:45:03 +0000273
Bernhard Reutner-Fischeree921392007-06-20 10:01:12 +0000274HOSTCC = gcc
275HOSTCXX = g++
276HOSTCFLAGS :=
277HOSTCXXFLAGS :=
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000278# We need some generic definitions
Denis Vlasenko14aa9f72006-10-31 23:03:09 +0000279include $(srctree)/scripts/Kbuild.include
Bernhard Reutner-Fischere28d1d62006-05-26 13:22:57 +0000280
Bernhard Reutner-Fischeree921392007-06-20 10:01:12 +0000281HOSTCFLAGS += $(call hostcc-option,-Wall -Wstrict-prototypes -O2 -fomit-frame-pointer,)
282HOSTCXXFLAGS += -O2
283
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000284# For maximum performance (+ possibly random breakage, uncomment
285# the following)
Eric Andersen00814662001-04-26 23:29:10 +0000286
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000287MAKEFLAGS += -rR
Bernhard Reutner-Fischerdf100942006-03-13 19:04:00 +0000288
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000289# Make variables (CC, etc...)
290
291AS = $(CROSS_COMPILE)as
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000292CC = $(CROSS_COMPILE)gcc
Bernhard Reutner-Fischere86bd6c2007-01-09 17:36:26 +0000293LD = $(CC) -nostdlib
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000294CPP = $(CC) -E
295AR = $(CROSS_COMPILE)ar
296NM = $(CROSS_COMPILE)nm
297STRIP = $(CROSS_COMPILE)strip
298OBJCOPY = $(CROSS_COMPILE)objcopy
299OBJDUMP = $(CROSS_COMPILE)objdump
Mike Frysinger5694afd2012-10-20 15:01:26 -0400300PKG_CONFIG ?= $(CROSS_COMPILE)pkg-config
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000301AWK = awk
302GENKSYMS = scripts/genksyms/genksyms
303DEPMOD = /sbin/depmod
304KALLSYMS = scripts/kallsyms
305PERL = perl
306CHECK = sparse
307
308CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
309MODFLAGS = -DMODULE
310CFLAGS_MODULE = $(MODFLAGS)
311AFLAGS_MODULE = $(MODFLAGS)
312LDFLAGS_MODULE = -r
313CFLAGS_KERNEL =
314AFLAGS_KERNEL =
315
316
317# Use LINUXINCLUDE when you must reference the include/ directory.
318# Needed to be compatible with the O= option
Mike Frysinger5b6195c2007-01-26 07:14:01 +0000319CFLAGS := $(CFLAGS)
Denis Vlasenko1da86d22008-06-04 11:28:24 +0000320# Added only to final link stage of busybox binary
321CFLAGS_busybox := $(CFLAGS_busybox)
Mike Frysinger5b6195c2007-01-26 07:14:01 +0000322CPPFLAGS := $(CPPFLAGS)
323AFLAGS := $(AFLAGS)
Mike Frysinger52a9db62007-03-30 05:44:15 +0000324LDFLAGS := $(LDFLAGS)
325LDLIBS :=
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000326
327# Read KERNELRELEASE from .kernelrelease (if it exists)
328KERNELRELEASE = $(shell cat .kernelrelease 2> /dev/null)
329KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
330
331export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION \
332 ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
333 CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
Mike Frysinger9020d852007-04-05 21:14:29 +0000334 HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000335
336export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
Denis Vlasenkof7996f32007-01-11 17:20:00 +0000337export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000338export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
Mike Frysinger9020d852007-04-05 21:14:29 +0000339export FLTFLAGS
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000340
341# When compiling out-of-tree modules, put MODVERDIR in the module
342# tree rather than in the kernel tree. The kernel tree might
343# even be read-only.
344export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
345
346# Files to ignore in find ... statements
347
348RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
349export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
350
351# ===========================================================================
352# Rules shared between *config targets and build targets
353
354# Basic helpers built in scripts/
355PHONY += scripts_basic
356scripts_basic:
357 $(Q)$(MAKE) $(build)=scripts/basic
358
359# To avoid any implicit rule to kick in, define an empty command.
360scripts/basic/%: scripts_basic ;
361
Denys Vlasenko6c5bf0d2010-06-06 00:53:45 +0200362# This target generates Kbuild's and Config.in's from *.c files
363PHONY += gen_build_files
Denys Vlasenko8d444492010-06-25 13:56:28 +0200364gen_build_files: $(wildcard $(srctree)/*/*.c) $(wildcard $(srctree)/*/*/*.c)
Denys Vlasenko6c5bf0d2010-06-06 00:53:45 +0200365 $(Q)$(srctree)/scripts/gen_build_files.sh $(srctree) $(objtree)
366
Denys Vlasenkob24c1132009-11-24 22:23:21 +0100367# bbox: we have helpers in applets/
Denys Vlasenko18221502009-11-25 00:22:31 +0100368# we depend on scripts_basic, since scripts/basic/fixdep
369# must be built before any other host prog
Denys Vlasenkob24c1132009-11-24 22:23:21 +0100370PHONY += applets_dir
Denys Vlasenko6c5bf0d2010-06-06 00:53:45 +0200371applets_dir: scripts_basic gen_build_files
Denys Vlasenkob24c1132009-11-24 22:23:21 +0100372 $(Q)$(MAKE) $(build)=applets
373
374applets/%: applets_dir ;
375
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000376PHONY += outputmakefile
377# outputmakefile generates a Makefile in the output directory, if using a
378# separate output directory. This allows convenient use of make in the
379# output directory.
380outputmakefile:
381ifneq ($(KBUILD_SRC),)
382 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
383 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
384endif
385
386# To make sure we do not include .config for any of the *config targets
387# catch them early, and hand them over to scripts/kconfig/Makefile
388# It is allowed to specify more targets when calling make, including
389# mixing *config targets and build targets.
Denis Vlasenkof7996f32007-01-11 17:20:00 +0000390# For example 'make oldconfig all'.
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000391# Detect when mixed targets is specified, and make a second invocation
392# of make so .config is not included in this case either (for *config).
393
394no-dot-config-targets := clean mrproper distclean \
Denis Vlasenkob75a1c32008-04-10 19:59:20 +0000395 cscope TAGS tags help %docs
396#bbox# check% is removed from above
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000397
398config-targets := 0
399mixed-targets := 0
400dot-config := 1
401
402ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
403 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
404 dot-config := 0
405 endif
406endif
407
408ifeq ($(KBUILD_EXTMOD),)
409 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
410 config-targets := 1
411 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
412 mixed-targets := 1
413 endif
414 endif
415endif
416
417ifeq ($(mixed-targets),1)
418# ===========================================================================
419# We're called with mixed targets (*config and build targets).
420# Handle them one by one.
421
422%:: FORCE
423 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
424
425else
426ifeq ($(config-targets),1)
427# ===========================================================================
428# *config targets only - make sure prerequisites are updated, and descend
429# in scripts/kconfig to make the *config target
430
431# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
432# KBUILD_DEFCONFIG may point out an alternative default configuration
433# used for 'make defconfig'
434-include $(srctree)/arch/$(ARCH)/Makefile
435export KBUILD_DEFCONFIG
436
Denys Vlasenkoadbe3b52010-08-22 09:28:46 +0200437config: scripts_basic outputmakefile gen_build_files FORCE
438 $(Q)mkdir -p include
439 $(Q)$(MAKE) $(build)=scripts/kconfig $@
440 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= .kernelrelease
441
442%config: scripts_basic outputmakefile gen_build_files FORCE
Denis Vlasenko665b02c2006-10-11 21:24:42 +0000443 $(Q)mkdir -p include
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000444 $(Q)$(MAKE) $(build)=scripts/kconfig $@
445 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= .kernelrelease
446
447else
448# ===========================================================================
449# Build targets only - this includes busybox, arch specific targets, clean
450# targets and others. In general all targets except *config targets.
451
452ifeq ($(KBUILD_EXTMOD),)
453# Additional helpers built in scripts/
454# Carefully list dependencies so we do not try to build scripts twice
Denys Vlasenko6c5bf0d2010-06-06 00:53:45 +0200455# in parallel
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000456PHONY += scripts
Denys Vlasenko7fb68f12010-05-09 04:22:48 +0200457scripts: gen_build_files scripts_basic include/config/MARKER
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000458 $(Q)$(MAKE) $(build)=$(@)
459
460scripts_basic: include/autoconf.h
461
462# Objects we will link into busybox / subdirs we need to visit
463core-y := \
464 applets/ \
465
466libs-y := \
467 archival/ \
Denys Vlasenko833d4e72010-11-03 02:38:31 +0100468 archival/libarchive/ \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000469 console-tools/ \
470 coreutils/ \
471 coreutils/libcoreutils/ \
472 debianutils/ \
473 e2fsprogs/ \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000474 editors/ \
475 findutils/ \
476 init/ \
477 libbb/ \
478 libpwdgrp/ \
479 loginutils/ \
Denis Vlasenkob9d572a2008-11-06 23:41:38 +0000480 mailutils/ \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000481 miscutils/ \
482 modutils/ \
483 networking/ \
484 networking/libiproute/ \
485 networking/udhcp/ \
Denis Vlasenko68444b92008-02-22 22:24:48 +0000486 printutils/ \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000487 procps/ \
488 runit/ \
Denis Vlasenkod46d3c22007-02-06 19:28:50 +0000489 selinux/ \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000490 shell/ \
491 sysklogd/ \
492 util-linux/ \
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000493 util-linux/volume_id/ \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000494
495endif # KBUILD_EXTMOD
496
497ifeq ($(dot-config),1)
Bernhard Reutner-Fischerdf100942006-03-13 19:04:00 +0000498# In this section, we need .config
Eric Andersen7daa0762004-10-08 07:46:08 +0000499
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000500# Read in dependencies to all Kconfig* files, make sure to run
501# oldconfig if changes are detected.
502-include .kconfig.d
Bernhard Reutner-Fischer5c071bc2005-10-05 07:40:46 +0000503
Denis Vlasenko8bf7bb82006-10-05 17:42:55 +0000504-include .config
Bernhard Reutner-Fischer7ca61b62006-01-15 14:04:57 +0000505
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000506# If .config needs to be updated, it will be done via the dependency
507# that autoconf has on .config.
508# To avoid any implicit rule to kick in, define an empty command
509.config .kconfig.d: ;
Bernhard Reutner-Fischer5d261262006-03-01 22:54:48 +0000510
Denis Vlasenkob54b2082006-10-27 09:05:40 +0000511# Now we can define CFLAGS etc according to .config
512include $(srctree)/Makefile.flags
513
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000514# If .config is newer than include/autoconf.h, someone tinkered
515# with it and forgot to run make oldconfig.
516# If kconfig.d is missing then we are probarly in a cleaned tree so
517# we execute the config step to be sure to catch updated Kconfig files
Denys Vlasenko8d444492010-06-25 13:56:28 +0200518include/autoconf.h: .kconfig.d .config $(wildcard $(srctree)/*/*.c) $(wildcard $(srctree)/*/*/*.c) | gen_build_files
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000519 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
Bernhard Reutner-Fischerdf100942006-03-13 19:04:00 +0000520
Denys Vlasenko5c296de2010-07-03 14:28:35 +0200521include/usage.h: gen_build_files
522
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000523else
524# Dummy target needed, because used as prerequisite
525include/autoconf.h: ;
Bernhard Reutner-Fischer08c5a172006-01-25 15:58:04 +0000526endif
527
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000528# The all: target is the default when no target is given on the
529# command line.
530# This allow a user to issue only 'make' to build a kernel including modules
Mike Frysinger757ed502007-03-17 06:26:51 +0000531# Defaults busybox but it is usually overridden in the arch makefile
Bernhard Reutner-Fischera28a05b2008-08-21 21:15:28 +0000532all: busybox doc
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000533
534-include $(srctree)/arch/$(ARCH)/Makefile
535
536# arch Makefile may override CC so keep this after arch Makefile is included
537#bbox# NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
538CHECKFLAGS += $(NOSTDINC_FLAGS)
539
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000540# Default kernel image to build when no specific target is given.
541# KBUILD_IMAGE may be overruled on the commandline or
542# set in the environment
543# Also any assignments in arch/$(ARCH)/Makefile take precedence over
544# this default value
545export KBUILD_IMAGE ?= busybox
546
547#
548# INSTALL_PATH specifies where to place the updated kernel and system map
549# images. Default is /boot, but you can set it to other values
550export INSTALL_PATH ?= /boot
551
552#
553# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
554# relocations required by build roots. This is not defined in the
Maninder Singh97c64912015-05-25 13:46:36 +0200555# makefile but the argument can be passed to make if needed.
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000556#
557
558MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
559export MODLIB
560
561
562ifeq ($(KBUILD_EXTMOD),)
563busybox-dirs := $(patsubst %/,%,$(filter %/, $(core-y) $(core-m) $(libs-y) $(libs-m)))
564
565busybox-alldirs := $(sort $(busybox-dirs) $(patsubst %/,%,$(filter %/, \
566 $(core-n) $(core-) $(libs-n) $(libs-) \
567 )))
568
569core-y := $(patsubst %/, %/built-in.o, $(core-y))
570libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
571libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
572libs-y := $(libs-y1) $(libs-y2)
573
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000574# Build busybox
575# ---------------------------------------------------------------------------
576# busybox is build from the objects selected by $(busybox-init) and
577# $(busybox-main). Most are built-in.o files from top-level directories
578# in the kernel tree, others are specified in arch/$(ARCH)Makefile.
579# Ordering when linking is important, and $(busybox-init) must be first.
580#
581# busybox
582# ^
583# |
584# +-< $(busybox-init)
585# | +--< init/version.o + more
586# |
587# +--< $(busybox-main)
588# | +--< driver/built-in.o mm/built-in.o + more
589# |
590# +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
591#
592# busybox version (uname -v) cannot be updated during normal
593# descending-into-subdirs phase since we do not yet know if we need to
594# update busybox.
595# Therefore this step is delayed until just before final link of busybox -
596# except in the kallsyms case where it is done just before adding the
597# symbols to the kernel.
598#
599# System.map is generated to document addresses of all kernel symbols
600
601busybox-all := $(core-y) $(libs-y)
602
603# Rule to link busybox - also used during CONFIG_KALLSYMS
604# May be overridden by arch/$(ARCH)/Makefile
605quiet_cmd_busybox__ ?= LINK $@
Denis Vlasenko32404742007-10-07 17:05:22 +0000606 cmd_busybox__ ?= $(srctree)/scripts/trylink \
607 "$@" \
608 "$(CC)" \
Denis Vlasenko1da86d22008-06-04 11:28:24 +0000609 "$(CFLAGS) $(CFLAGS_busybox)" \
Denis Vlasenko32404742007-10-07 17:05:22 +0000610 "$(LDFLAGS) $(EXTRA_LDFLAGS)" \
611 "$(core-y)" \
612 "$(libs-y)" \
613 "$(LDLIBS)"
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000614
615# Generate System.map
Denis Vlasenkof7996f32007-01-11 17:20:00 +0000616quiet_cmd_sysmap = SYSMAP
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000617 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
618
619# Link of busybox
620# If CONFIG_KALLSYMS is set .version is already updated
621# Generate System.map and verify that the content is consistent
622# Use + in front of the busybox_version rule to silent warning with make -j2
623# First command is ':' to allow us to use + in front of the rule
624define rule_busybox__
625 :
626 $(call cmd,busybox__)
627 $(Q)echo 'cmd_$@ := $(cmd_busybox__)' > $(@D)/.$(@F).cmd
628endef
629
630
631ifdef CONFIG_KALLSYMS
632# Generate section listing all symbols and add it into busybox $(kallsyms.o)
633# It's a three stage process:
634# o .tmp_busybox1 has all symbols and sections, but __kallsyms is
635# empty
636# Running kallsyms on that gives us .tmp_kallsyms1.o with
637# the right size - busybox version (uname -v) is updated during this step
638# o .tmp_busybox2 now has a __kallsyms section of the right size,
639# but due to the added section, some addresses have shifted.
640# From here, we generate a correct .tmp_kallsyms2.o
641# o The correct .tmp_kallsyms2.o is linked into the final busybox.
642# o Verify that the System.map from busybox matches the map from
643# .tmp_busybox2, just in case we did not generate kallsyms correctly.
644# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
645# .tmp_busybox3 and .tmp_kallsyms3.o. This is only meant as a
646# temporary bypass to allow the kernel to be built while the
647# maintainers work out what went wrong with kallsyms.
648
649ifdef CONFIG_KALLSYMS_EXTRA_PASS
650last_kallsyms := 3
651else
652last_kallsyms := 2
Bernhard Reutner-Fischer7ca61b62006-01-15 14:04:57 +0000653endif
Bernhard Reutner-Fischer7ca61b62006-01-15 14:04:57 +0000654
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000655kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
Bernhard Reutner-Fischer7ca61b62006-01-15 14:04:57 +0000656
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000657define verify_kallsyms
658 $(Q)$(if $($(quiet)cmd_sysmap), \
659 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
660 $(cmd_sysmap) .tmp_busybox$(last_kallsyms) .tmp_System.map
661 $(Q)cmp -s System.map .tmp_System.map || \
662 (echo Inconsistent kallsyms data; \
663 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
664 rm .tmp_kallsyms* ; /bin/false )
665endef
666
667# Update busybox version before link
668# Use + in front of this rule to silent warning about make -j1
669# First command is ':' to allow us to use + in front of this rule
670cmd_ksym_ld = $(cmd_busybox__)
671define rule_ksym_ld
Denis Vlasenkof7996f32007-01-11 17:20:00 +0000672 :
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000673 +$(call cmd,busybox_version)
674 $(call cmd,busybox__)
675 $(Q)echo 'cmd_$@ := $(cmd_busybox__)' > $(@D)/.$(@F).cmd
676endef
677
678# Generate .S file with all kernel symbols
679quiet_cmd_kallsyms = KSYM $@
680 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
681 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
682
683.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
684 $(call if_changed_dep,as_o_S)
685
686.tmp_kallsyms%.S: .tmp_busybox% $(KALLSYMS)
687 $(call cmd,kallsyms)
688
689# .tmp_busybox1 must be complete except kallsyms, so update busybox version
690.tmp_busybox1: $(busybox-lds) $(busybox-all) FORCE
691 $(call if_changed_rule,ksym_ld)
692
693.tmp_busybox2: $(busybox-lds) $(busybox-all) .tmp_kallsyms1.o FORCE
694 $(call if_changed,busybox__)
695
696.tmp_busybox3: $(busybox-lds) $(busybox-all) .tmp_kallsyms2.o FORCE
697 $(call if_changed,busybox__)
698
699# Needs to visit scripts/ before $(KALLSYMS) can be used.
700$(KALLSYMS): scripts ;
701
702# Generate some data for debugging strange kallsyms problems
703debug_kallsyms: .tmp_map$(last_kallsyms)
704
705.tmp_map%: .tmp_busybox% FORCE
706 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
707
708.tmp_map3: .tmp_map2
709
710.tmp_map2: .tmp_map1
711
712endif # ifdef CONFIG_KALLSYMS
713
714# busybox image - including updated kernel symbols
715busybox_unstripped: $(busybox-all) FORCE
716 $(call if_changed_rule,busybox__)
717 $(Q)rm -f .old_version
Bernhard Reutner-Fischercfc5d862006-03-02 09:44:32 +0000718
719busybox: busybox_unstripped
Mike Frysinger5b5bcf22007-06-19 15:58:02 +0000720ifeq ($(SKIP_STRIP),y)
721 $(Q)cp $< $@
722else
Denis Vlasenko4e33e072006-10-16 18:24:57 +0000723 $(Q)$(STRIP) -s --remove-section=.note --remove-section=.comment \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000724 busybox_unstripped -o $@
Denis Vlasenkocc3f20b2008-06-23 22:31:52 +0000725# strip is confused by PIE executable and does not set exec bits
726 $(Q)chmod a+x $@
Mike Frysinger5b5bcf22007-06-19 15:58:02 +0000727endif
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000728
Denis Vlasenkof7996f32007-01-11 17:20:00 +0000729# The actual objects are generated when descending,
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000730# make sure no implicit rule kicks in
731$(sort $(busybox-all)): $(busybox-dirs) ;
Mike Frysinger586ea612006-04-21 01:18:07 +0000732
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000733# Handle descending into subdirectories listed in $(busybox-dirs)
734# Preset locale variables to speed up the build process. Limit locale
735# tweaks to this spot to avoid wrong language settings when running
736# make menuconfig etc.
737# Error messages still appears in the original language
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000738
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000739PHONY += $(busybox-dirs)
740$(busybox-dirs): prepare scripts
741 $(Q)$(MAKE) $(build)=$@
742
743# Build the kernel release string
744# The KERNELRELEASE is stored in a file named .kernelrelease
745# to be used when executing for example make install or make modules_install
746#
747# Take the contents of any files called localversion* and the config
748# variable CONFIG_LOCALVERSION and append them to KERNELRELEASE.
749# LOCALVERSION from the command line override all of this
750
751nullstring :=
752space := $(nullstring) # end of line
753
754___localver = $(objtree)/localversion* $(srctree)/localversion*
755__localver = $(sort $(wildcard $(___localver)))
756# skip backup files (containing '~')
757_localver = $(foreach f, $(__localver), $(if $(findstring ~, $(f)),,$(f)))
758
759localver = $(subst $(space),, \
760 $(shell cat /dev/null $(_localver)) \
761 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
Denis Vlasenkof7996f32007-01-11 17:20:00 +0000762
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000763# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
764# and if the SCM is know a tag from the SCM is appended.
765# The appended tag is determinded by the SCM used.
766#
767# Currently, only git is supported.
768# Other SCMs can edit scripts/setlocalversion and add the appropriate
769# checks as needed.
Mike Frysinger534b8d02008-02-07 22:44:27 +0000770ifdef _BB_DISABLED_CONFIG_LOCALVERSION_AUTO
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000771 _localver-auto = $(shell $(CONFIG_SHELL) \
772 $(srctree)/scripts/setlocalversion $(srctree))
773 localver-auto = $(LOCALVERSION)$(_localver-auto)
Eric Andersen13879102004-08-26 23:13:00 +0000774endif
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000775
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000776localver-full = $(localver)$(localver-auto)
Eric Andersen1f30a412002-04-13 13:39:48 +0000777
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000778# Store (new) KERNELRELASE string in .kernelrelease
779kernelrelease = $(KERNELVERSION)$(localver-full)
780.kernelrelease: FORCE
781 $(Q)rm -f $@
782 $(Q)echo $(kernelrelease) > $@
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000783
Rob Landleyd9872aa2006-05-27 21:24:16 +0000784
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000785# Things we need to do before we recursively start building the kernel
786# or the modules are listed in "prepare".
787# A multi level approach is used. prepareN is processed before prepareN-1.
788# archprepare is used in arch Makefiles and when processed asm symlink,
789# version.h and scripts_basic is processed / created.
Rob Landleyd9872aa2006-05-27 21:24:16 +0000790
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000791# Listed in dependency order
792PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
Rob Landley16890752005-09-02 00:41:53 +0000793
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000794# prepare-all is deprecated, use prepare as valid replacement
795PHONY += prepare-all
Rob Landleyd9872aa2006-05-27 21:24:16 +0000796
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000797# prepare3 is used to check if we are building in a separate output directory,
798# and if so do:
799# 1) Check that make has not been executed in the kernel src $(srctree)
800# 2) Create the include2 directory, used for the second asm symlink
801prepare3: .kernelrelease
802ifneq ($(KBUILD_SRC),)
Denis Vlasenkoff65cd42007-08-12 20:59:07 +0000803 @echo ' Using $(srctree) as source for busybox'
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000804 $(Q)if [ -f $(srctree)/.config ]; then \
805 echo " $(srctree) is not clean, please run 'make mrproper'";\
806 echo " in the '$(srctree)' directory.";\
807 /bin/false; \
Bernhard Reutner-Fischerdf100942006-03-13 19:04:00 +0000808 fi;
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000809 $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
810 $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
811endif
Eric Andersen85208e22002-04-12 12:05:57 +0000812
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000813# prepare2 creates a makefile if using a separate output directory
814prepare2: prepare3 outputmakefile
Eric Andersencc8ed391999-10-05 16:24:54 +0000815
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000816prepare1: prepare2 include/config/MARKER
817ifneq ($(KBUILD_MODULES),)
818 $(Q)mkdir -p $(MODVERDIR)
819 $(Q)rm -f $(MODVERDIR)/*
820endif
Eric Andersencc8ed391999-10-05 16:24:54 +0000821
Denys Vlasenkob24c1132009-11-24 22:23:21 +0100822archprepare: prepare1 scripts_basic applets_dir
Mark Whitleydd23b8b2000-07-10 23:00:47 +0000823
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000824prepare0: archprepare FORCE
825 $(Q)$(MAKE) $(build)=.
Matt Kraai4e05da82001-11-19 19:47:56 +0000826
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000827# All the preparing..
828prepare prepare-all: prepare0
Bernhard Reutner-Fischerfa61ca72006-06-16 17:19:39 +0000829
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000830# Leave this as default for preprocessing busybox.lds.S, which is now
831# done in arch/$(ARCH)/kernel/Makefile
832
833export CPPFLAGS_busybox.lds += -P -C -U$(ARCH)
834
835# FIXME: The asm symlink changes when $(ARCH) changes. That's
836# hard to detect, but I suppose "make mrproper" is a good idea
837# before switching between archs anyway.
838
839#bbox# include/asm:
840#bbox# @echo ' SYMLINK $@ -> include/asm-$(ARCH)'
841#bbox# $(Q)if [ ! -d include ]; then mkdir -p include; fi;
842#bbox# @ln -fsn asm-$(ARCH) $@
843
844# Split autoconf.h into include/linux/config/*
Mike Frysingerd514ba22006-12-31 11:46:19 +0000845quiet_cmd_gen_bbconfigopts = GEN include/bbconfigopts.h
Denys Vlasenko9ce07e72010-08-29 14:36:11 +0200846 cmd_gen_bbconfigopts = $(srctree)/scripts/mkconfigs include/bbconfigopts.h include/bbconfigopts_bz2.h
Mike Frysingerd514ba22006-12-31 11:46:19 +0000847quiet_cmd_split_autoconf = SPLIT include/autoconf.h -> include/config/*
848 cmd_split_autoconf = scripts/basic/split-include include/autoconf.h include/config
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000849#bbox# piggybacked generation of few .h files
850include/config/MARKER: scripts/basic/split-include include/autoconf.h
Mike Frysingerd514ba22006-12-31 11:46:19 +0000851 $(call cmd,split_autoconf)
852 $(call cmd,gen_bbconfigopts)
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000853 @touch $@
854
855# Generate some files
856# ---------------------------------------------------------------------------
857
858# KERNELRELEASE can change from a few different places, meaning version.h
859# needs to be updated, so this check is forced on all builds
860
861uts_len := 64
862
863define filechk_version.h
864 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
865 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
866 exit 1; \
867 fi; \
868 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
869 echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
870 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
871 )
872endef
873
874# ---------------------------------------------------------------------------
875
876PHONY += depend dep
877depend dep:
878 @echo '*** Warning: make $@ is unnecessary now.'
879
880# ---------------------------------------------------------------------------
881# Modules
882
Mike Frysinger61160dd2008-01-27 09:41:24 +0000883ifdef _BB_DISABLED_CONFIG_MODULES
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000884
885# By default, build modules as well
886
887all: modules
888
889# Build modules
890
891PHONY += modules
892modules: $(busybox-dirs) $(if $(KBUILD_BUILTIN),busybox)
893 @echo ' Building modules, stage 2.';
894 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
Bernhard Reutner-Fischerfa61ca72006-06-16 17:19:39 +0000895
Bernhard Reutner-Fischer07a79e72006-03-09 09:03:37 +0000896
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000897# Target to prepare building external modules
898PHONY += modules_prepare
899modules_prepare: prepare scripts
Bernhard Reutner-Fischerdf100942006-03-13 19:04:00 +0000900
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000901# Target to install modules
902PHONY += modules_install
903modules_install: _modinst_ _modinst_post
904
905PHONY += _modinst_
906_modinst_:
907 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
908 echo "Warning: you may need to install module-init-tools"; \
909 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
910 sleep 1; \
911 fi
912 @rm -rf $(MODLIB)/kernel
913 @rm -f $(MODLIB)/source
914 @mkdir -p $(MODLIB)/kernel
915 @ln -s $(srctree) $(MODLIB)/source
916 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
917 rm -f $(MODLIB)/build ; \
918 ln -s $(objtree) $(MODLIB)/build ; \
919 fi
920 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
921
922# If System.map exists, run depmod. This deliberately does not have a
923# dependency on System.map since that would run the dependency tree on
924# busybox. This depmod is only for convenience to give the initial
925# boot a modules.dep even before / is mounted read-write. However the
926# boot script depmod is the master version.
927ifeq "$(strip $(INSTALL_MOD_PATH))" ""
928depmod_opts :=
929else
930depmod_opts := -b $(INSTALL_MOD_PATH) -r
931endif
932PHONY += _modinst_post
933_modinst_post: _modinst_
934 if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
935
936else # CONFIG_MODULES
937
938# Modules not configured
939# ---------------------------------------------------------------------------
940
941modules modules_install: FORCE
942 @echo
Denis Vlasenkoeb98be02006-11-30 22:40:32 +0000943 @echo "The present busybox configuration has modules disabled."
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000944 @echo "Type 'make config' and enable loadable module support."
945 @echo "Then build a kernel with module support enabled."
946 @echo
947 @exit 1
948
949endif # CONFIG_MODULES
950
951###
952# Cleaning is done on three levels.
953# make clean Delete most generated files
954# Leave enough to build external modules
955# make mrproper Delete the current configuration, and all generated files
956# make distclean Remove editor backup files, patch leftover files and the like
957
958# Directories & files removed with 'make clean'
Denis Vlasenko2b68c8f2008-07-20 18:37:54 +0000959CLEAN_DIRS += $(MODVERDIR) _install 0_lib
960CLEAN_FILES += busybox busybox_unstripped* busybox.links \
961 System.map .kernelrelease \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000962 .tmp_kallsyms* .tmp_version .tmp_busybox* .tmp_System.map
963
964# Directories & files removed with 'make mrproper'
965MRPROPER_DIRS += include/config include2
966MRPROPER_FILES += .config .config.old include/asm .version .old_version \
Denys Vlasenkod488f5e2011-06-07 10:01:58 +0200967 include/NUM_APPLETS.h \
Denis Vlasenko8bf7bb82006-10-05 17:42:55 +0000968 include/autoconf.h \
969 include/bbconfigopts.h \
Denys Vlasenkod488f5e2011-06-07 10:01:58 +0200970 include/bbconfigopts_bz2.h \
Denis Vlasenko8bf7bb82006-10-05 17:42:55 +0000971 include/usage_compressed.h \
Denis Vlasenko1aa7e472007-11-28 06:49:03 +0000972 include/applet_tables.h \
Denys Vlasenkod488f5e2011-06-07 10:01:58 +0200973 include/applets.h \
974 include/usage.h \
Denis Vlasenko1aa7e472007-11-28 06:49:03 +0000975 applets/usage \
Denis Vlasenko2b68c8f2008-07-20 18:37:54 +0000976 .kernelrelease Module.symvers tags TAGS cscope* \
977 busybox_old
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000978
979# clean - Delete most, but leave enough to build external modules
980#
981clean: rm-dirs := $(CLEAN_DIRS)
982clean: rm-files := $(CLEAN_FILES)
983clean-dirs := $(addprefix _clean_,$(srctree) $(busybox-alldirs))
984
985PHONY += $(clean-dirs) clean archclean
986$(clean-dirs):
987 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
988
989clean: archclean $(clean-dirs)
990 $(call cmd,rmdirs)
991 $(call cmd,rmfiles)
992 @find . $(RCS_FIND_IGNORE) \
Denis Vlasenko52ec4b92008-07-12 23:02:43 +0000993 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000994 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
995 -type f -print | xargs rm -f
996
Bernhard Reutner-Fischer8eeaa742008-08-21 13:47:20 +0000997PHONY += doc-clean
998doc-clean: rm-files := docs/busybox.pod \
Denys Vlasenko17fc33d2010-10-24 03:46:16 +0200999 docs/BusyBox.html docs/busybox.1 docs/BusyBox.txt
Bernhard Reutner-Fischer8eeaa742008-08-21 13:47:20 +00001000doc-clean:
1001 $(call cmd,rmfiles)
1002
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001003# mrproper - Delete all generated files, including .config
1004#
1005mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1006mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
Denis Vlasenko8bf7bb82006-10-05 17:42:55 +00001007mrproper-dirs := $(addprefix _mrproper_,scripts)
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001008
1009PHONY += $(mrproper-dirs) mrproper archmrproper
1010$(mrproper-dirs):
1011 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1012
1013mrproper: clean archmrproper $(mrproper-dirs)
1014 $(call cmd,rmdirs)
1015 $(call cmd,rmfiles)
Chris Rees12caabf2010-11-30 09:41:39 +01001016 @find . -name Config.src | sed 's/.src$$/.in/' | xargs -r rm -f
1017 @find . -name Kbuild.src | sed 's/.src$$//' | xargs -r rm -f
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001018
1019# distclean
1020#
1021PHONY += distclean
1022
1023distclean: mrproper
1024 @find $(srctree) $(RCS_FIND_IGNORE) \
Denis Vlasenko52ec4b92008-07-12 23:02:43 +00001025 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001026 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
Denis Vlasenko52ec4b92008-07-12 23:02:43 +00001027 -o -name '.*.rej' -o -name '*.tmp' -o -size 0 \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001028 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1029 -type f -print | xargs rm -f
1030
1031
1032# Packaging of the kernel to various formats
1033# ---------------------------------------------------------------------------
1034# rpm target kept for backward compatibility
1035package-dir := $(srctree)/scripts/package
1036
1037%pkg: FORCE
1038 $(Q)$(MAKE) $(build)=$(package-dir) $@
1039rpm: FORCE
1040 $(Q)$(MAKE) $(build)=$(package-dir) $@
1041
1042
1043# Brief documentation of the typical targets used
1044# ---------------------------------------------------------------------------
1045
Daniel Fandrich126f2b22011-07-08 07:59:16 +02001046boards := $(wildcard $(srctree)/configs/*_defconfig)
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001047boards := $(notdir $(boards))
1048
Denis Vlasenko14aa9f72006-10-31 23:03:09 +00001049-include $(srctree)/Makefile.help
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001050
1051# Documentation targets
1052# ---------------------------------------------------------------------------
1053%docs: scripts_basic FORCE
1054 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1055
1056else # KBUILD_EXTMOD
1057
1058###
1059# External module support.
1060# When building external modules the kernel used as basis is considered
1061# read-only, and no consistency checks are made and the make
1062# system is not used on the basis kernel. If updates are required
1063# in the basis kernel ordinary make commands (without M=...) must
1064# be used.
1065#
1066# The following are the only valid targets when building external
1067# modules.
1068# make M=dir clean Delete all automatically generated files
1069# make M=dir modules Make all modules in specified dir
1070# make M=dir Same as 'make M=dir modules'
1071# make M=dir modules_install
1072# Install the modules build in the module directory
1073# Assumes install directory is already created
1074
1075# We are always building modules
1076KBUILD_MODULES := 1
1077PHONY += crmodverdir
1078crmodverdir:
1079 $(Q)mkdir -p $(MODVERDIR)
1080 $(Q)rm -f $(MODVERDIR)/*
1081
1082PHONY += $(objtree)/Module.symvers
1083$(objtree)/Module.symvers:
1084 @test -e $(objtree)/Module.symvers || ( \
1085 echo; \
1086 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1087 echo " is missing; modules will have no dependencies and modversions."; \
1088 echo )
1089
1090module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1091PHONY += $(module-dirs) modules
1092$(module-dirs): crmodverdir $(objtree)/Module.symvers
1093 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1094
1095modules: $(module-dirs)
1096 @echo ' Building modules, stage 2.';
1097 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1098
1099PHONY += modules_install
1100modules_install: _emodinst_ _emodinst_post
1101
1102install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1103PHONY += _emodinst_
1104_emodinst_:
1105 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1106 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
1107
1108# Run depmod only is we have System.map and depmod is executable
1109quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1110 cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \
1111 $(DEPMOD) -ae -F System.map \
1112 $(if $(strip $(INSTALL_MOD_PATH)), \
1113 -b $(INSTALL_MOD_PATH) -r) \
1114 $(KERNELRELEASE); \
1115 fi
1116
1117PHONY += _emodinst_post
1118_emodinst_post: _emodinst_
1119 $(call cmd,depmod)
1120
1121clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1122
1123PHONY += $(clean-dirs) clean
1124$(clean-dirs):
1125 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1126
1127clean: rm-dirs := $(MODVERDIR)
1128clean: $(clean-dirs)
1129 $(call cmd,rmdirs)
1130 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
Denis Vlasenko52ec4b92008-07-12 23:02:43 +00001131 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001132 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1133 -type f -print | xargs rm -f
1134
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001135# Dummies...
1136PHONY += prepare scripts
1137prepare: ;
1138scripts: ;
1139endif # KBUILD_EXTMOD
1140
1141# Generate tags for editors
1142# ---------------------------------------------------------------------------
1143
1144#We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1145#(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1146#Adding $(srctree) adds about 20M on i386 to the size of the output file!
1147
1148ifeq ($(src),$(obj))
1149__srctree =
1150else
1151__srctree = $(srctree)/
1152endif
1153
1154ifeq ($(ALLSOURCE_ARCHS),)
1155ifeq ($(ARCH),um)
1156ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1157else
1158ALLINCLUDE_ARCHS := $(ARCH)
1159endif
1160else
1161#Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1162ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1163endif
1164
1165ALLSOURCE_ARCHS := $(ARCH)
1166
1167define all-sources
Bartosz Golaszewski6c19d352014-12-17 17:58:23 +01001168 ( find -regex '.*\.[ch]$$' )
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001169endef
1170
1171quiet_cmd_cscope-file = FILELST cscope.files
1172 cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1173
1174quiet_cmd_cscope = MAKE cscope.out
1175 cmd_cscope = cscope -b
1176
1177cscope: FORCE
1178 $(call cmd,cscope-file)
1179 $(call cmd,cscope)
1180
1181quiet_cmd_TAGS = MAKE $@
1182define cmd_TAGS
1183 rm -f $@; \
1184 ETAGSF=`etags --version | grep -i exuberant >/dev/null && \
1185 echo "-I __initdata,__exitdata,__acquires,__releases \
1186 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1187 --extra=+f --c-kinds=+px"`; \
1188 $(all-sources) | xargs etags $$ETAGSF -a
1189endef
1190
1191TAGS: FORCE
1192 $(call cmd,TAGS)
1193
1194
1195quiet_cmd_tags = MAKE $@
1196define cmd_tags
1197 rm -f $@; \
1198 CTAGSF=`ctags --version | grep -i exuberant >/dev/null && \
1199 echo "-I __initdata,__exitdata,__acquires,__releases \
1200 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1201 --extra=+f --c-kinds=+px"`; \
1202 $(all-sources) | xargs ctags $$CTAGSF -a
1203endef
1204
1205tags: FORCE
1206 $(call cmd,tags)
1207
1208
1209# Scripts to check various things for consistency
1210# ---------------------------------------------------------------------------
1211
1212includecheck:
1213 find * $(RCS_FIND_IGNORE) \
1214 -name '*.[hcS]' -type f -print | sort \
1215 | xargs $(PERL) -w scripts/checkincludes.pl
1216
1217versioncheck:
1218 find * $(RCS_FIND_IGNORE) \
1219 -name '*.[hcS]' -type f -print | sort \
1220 | xargs $(PERL) -w scripts/checkversion.pl
1221
1222namespacecheck:
1223 $(PERL) $(srctree)/scripts/namespace.pl
1224
1225endif #ifeq ($(config-targets),1)
1226endif #ifeq ($(mixed-targets),1)
1227
1228PHONY += checkstack
1229checkstack:
1230 $(OBJDUMP) -d busybox $$(find . -name '*.ko') | \
1231 $(PERL) $(src)/scripts/checkstack.pl $(ARCH)
1232
1233kernelrelease:
1234 $(if $(wildcard .kernelrelease), $(Q)echo $(KERNELRELEASE), \
1235 $(error kernelrelease not valid - run 'make *config' to update it))
1236kernelversion:
1237 @echo $(KERNELVERSION)
1238
1239# Single targets
1240# ---------------------------------------------------------------------------
1241# Single targets are compatible with:
1242# - build whith mixed source and output
1243# - build with separate output dir 'make O=...'
1244# - external modules
1245#
1246# target-dir => where to store outputfile
1247# build-dir => directory in kernel source tree to use
1248
1249ifeq ($(KBUILD_EXTMOD),)
1250 build-dir = $(patsubst %/,%,$(dir $@))
1251 target-dir = $(dir $@)
1252else
1253 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1254 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1255 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1256endif
1257
1258%.s: %.c prepare scripts FORCE
1259 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1260%.i: %.c prepare scripts FORCE
1261 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1262%.o: %.c prepare scripts FORCE
1263 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1264%.lst: %.c prepare scripts FORCE
1265 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1266%.s: %.S prepare scripts FORCE
1267 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1268%.o: %.S prepare scripts FORCE
1269 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1270
1271# Modules
Denys Vlasenkoadbe3b52010-08-22 09:28:46 +02001272%/: prepare scripts FORCE
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001273 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1274 $(build)=$(build-dir)
Denys Vlasenkoadbe3b52010-08-22 09:28:46 +02001275/: prepare scripts FORCE
1276 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1277 $(build)=$(build-dir)
1278
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001279%.ko: prepare scripts FORCE
1280 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1281 $(build)=$(build-dir) $(@:.ko=.o)
1282 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1283
Denis Vlasenkof7996f32007-01-11 17:20:00 +00001284# FIXME Should go into a make.lib or something
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001285# ===========================================================================
1286
1287quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1288 cmd_rmdirs = rm -rf $(rm-dirs)
1289
1290quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1291 cmd_rmfiles = rm -f $(rm-files)
1292
1293
1294a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1295 $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1296 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
1297
1298quiet_cmd_as_o_S = AS $@
1299cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1300
1301# read all saved command lines
1302
1303targets := $(wildcard $(sort $(targets)))
1304cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1305
1306ifneq ($(cmd_files),)
1307 $(cmd_files): ; # Do not try to update included dependency files
1308 include $(cmd_files)
1309endif
1310
1311# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1312# Usage:
1313# $(Q)$(MAKE) $(clean)=dir
1314clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1315
1316endif # skip-makefile
1317
1318PHONY += FORCE
1319FORCE:
1320
Denis Vlasenko14aa9f72006-10-31 23:03:09 +00001321-include $(srctree)/Makefile.custom
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001322
1323# Declare the contents of the .PHONY variable as phony. We keep that
1324# information in a variable se we can use it in if_changed and friends.
1325.PHONY: $(PHONY)