blob: 1216c94a544433ea3261db2039458034fce370c2 [file] [log] [blame]
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001VERSION = 1
Denys Vlasenko9d286a02021-08-19 15:06:57 +02002PATCHLEVEL = 35
Denis Vlasenkoa883fa42006-12-13 23:52:32 +00003SUBLEVEL = 0
Denys Vlasenko9d286a02021-08-19 15:06:57 +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),)
Denys Vlasenko1ef3ce92017-07-19 17:56:56 +0200181SUBARCH := $(shell echo $(CROSS_COMPILE) | cut -d- -f1 | sed 's:^.*/::g')
Denis Vlasenkob8e653b2008-06-02 04:51:29 +0000182else
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
Ron Yorstonaf694a42018-11-18 07:40:40 +0000364gen_build_files: $(wildcard $(srctree)/*/*.c) $(wildcard $(srctree)/*/*/*.c) $(wildcard $(srctree)/embed/*)
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
Michael Olbrich43dd0062018-04-12 10:36:54 +0200371applets_dir: scripts_basic gen_build_files include/config/MARKER
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/ \
Denys Vlasenkoab77e812017-08-18 19:15:29 +0200473 klibc-utils/ \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000474 e2fsprogs/ \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000475 editors/ \
476 findutils/ \
477 init/ \
478 libbb/ \
479 libpwdgrp/ \
480 loginutils/ \
Denis Vlasenkob9d572a2008-11-06 23:41:38 +0000481 mailutils/ \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000482 miscutils/ \
483 modutils/ \
484 networking/ \
485 networking/libiproute/ \
486 networking/udhcp/ \
Denis Vlasenko68444b92008-02-22 22:24:48 +0000487 printutils/ \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000488 procps/ \
489 runit/ \
Denis Vlasenkod46d3c22007-02-06 19:28:50 +0000490 selinux/ \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000491 shell/ \
492 sysklogd/ \
493 util-linux/ \
Denis Vlasenkode7684a2008-02-18 21:08:49 +0000494 util-linux/volume_id/ \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000495
496endif # KBUILD_EXTMOD
497
498ifeq ($(dot-config),1)
Bernhard Reutner-Fischerdf100942006-03-13 19:04:00 +0000499# In this section, we need .config
Eric Andersen7daa0762004-10-08 07:46:08 +0000500
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000501# Read in dependencies to all Kconfig* files, make sure to run
502# oldconfig if changes are detected.
503-include .kconfig.d
Bernhard Reutner-Fischer5c071bc2005-10-05 07:40:46 +0000504
Denis Vlasenko8bf7bb82006-10-05 17:42:55 +0000505-include .config
Bernhard Reutner-Fischer7ca61b62006-01-15 14:04:57 +0000506
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000507# If .config needs to be updated, it will be done via the dependency
508# that autoconf has on .config.
509# To avoid any implicit rule to kick in, define an empty command
510.config .kconfig.d: ;
Bernhard Reutner-Fischer5d261262006-03-01 22:54:48 +0000511
Thomas Petazzonie9a25ac2017-07-14 23:08:38 +0200512-include $(srctree)/arch/$(ARCH)/Makefile
513
Denis Vlasenkob54b2082006-10-27 09:05:40 +0000514# Now we can define CFLAGS etc according to .config
515include $(srctree)/Makefile.flags
516
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000517# If .config is newer than include/autoconf.h, someone tinkered
518# with it and forgot to run make oldconfig.
519# If kconfig.d is missing then we are probarly in a cleaned tree so
520# we execute the config step to be sure to catch updated Kconfig files
Denys Vlasenko8d444492010-06-25 13:56:28 +0200521include/autoconf.h: .kconfig.d .config $(wildcard $(srctree)/*/*.c) $(wildcard $(srctree)/*/*/*.c) | gen_build_files
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000522 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
Bernhard Reutner-Fischerdf100942006-03-13 19:04:00 +0000523
Denys Vlasenko5c296de2010-07-03 14:28:35 +0200524include/usage.h: gen_build_files
525
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000526else
527# Dummy target needed, because used as prerequisite
528include/autoconf.h: ;
Bernhard Reutner-Fischer08c5a172006-01-25 15:58:04 +0000529endif
530
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000531# The all: target is the default when no target is given on the
532# command line.
533# This allow a user to issue only 'make' to build a kernel including modules
Mike Frysinger757ed502007-03-17 06:26:51 +0000534# Defaults busybox but it is usually overridden in the arch makefile
Bernhard Reutner-Fischera28a05b2008-08-21 21:15:28 +0000535all: busybox doc
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000536
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000537# arch Makefile may override CC so keep this after arch Makefile is included
538#bbox# NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
539CHECKFLAGS += $(NOSTDINC_FLAGS)
540
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000541# Default kernel image to build when no specific target is given.
542# KBUILD_IMAGE may be overruled on the commandline or
543# set in the environment
544# Also any assignments in arch/$(ARCH)/Makefile take precedence over
545# this default value
546export KBUILD_IMAGE ?= busybox
547
548#
549# INSTALL_PATH specifies where to place the updated kernel and system map
550# images. Default is /boot, but you can set it to other values
551export INSTALL_PATH ?= /boot
552
553#
554# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
555# relocations required by build roots. This is not defined in the
Maninder Singh97c64912015-05-25 13:46:36 +0200556# makefile but the argument can be passed to make if needed.
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000557#
558
559MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
560export MODLIB
561
562
563ifeq ($(KBUILD_EXTMOD),)
564busybox-dirs := $(patsubst %/,%,$(filter %/, $(core-y) $(core-m) $(libs-y) $(libs-m)))
565
566busybox-alldirs := $(sort $(busybox-dirs) $(patsubst %/,%,$(filter %/, \
567 $(core-n) $(core-) $(libs-n) $(libs-) \
568 )))
569
570core-y := $(patsubst %/, %/built-in.o, $(core-y))
571libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
572libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
573libs-y := $(libs-y1) $(libs-y2)
574
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000575# Build busybox
576# ---------------------------------------------------------------------------
577# busybox is build from the objects selected by $(busybox-init) and
578# $(busybox-main). Most are built-in.o files from top-level directories
579# in the kernel tree, others are specified in arch/$(ARCH)Makefile.
580# Ordering when linking is important, and $(busybox-init) must be first.
581#
582# busybox
583# ^
584# |
585# +-< $(busybox-init)
586# | +--< init/version.o + more
587# |
588# +--< $(busybox-main)
589# | +--< driver/built-in.o mm/built-in.o + more
590# |
591# +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
592#
593# busybox version (uname -v) cannot be updated during normal
594# descending-into-subdirs phase since we do not yet know if we need to
595# update busybox.
596# Therefore this step is delayed until just before final link of busybox -
597# except in the kallsyms case where it is done just before adding the
598# symbols to the kernel.
599#
600# System.map is generated to document addresses of all kernel symbols
601
602busybox-all := $(core-y) $(libs-y)
603
604# Rule to link busybox - also used during CONFIG_KALLSYMS
605# May be overridden by arch/$(ARCH)/Makefile
606quiet_cmd_busybox__ ?= LINK $@
Denis Vlasenko32404742007-10-07 17:05:22 +0000607 cmd_busybox__ ?= $(srctree)/scripts/trylink \
608 "$@" \
609 "$(CC)" \
Denis Vlasenko1da86d22008-06-04 11:28:24 +0000610 "$(CFLAGS) $(CFLAGS_busybox)" \
Denis Vlasenko32404742007-10-07 17:05:22 +0000611 "$(LDFLAGS) $(EXTRA_LDFLAGS)" \
612 "$(core-y)" \
613 "$(libs-y)" \
Denys Vlasenkoe6a2f4c2016-04-21 16:26:30 +0200614 "$(LDLIBS)" \
Denys Vlasenko1f9ed022021-02-23 23:09:49 +0100615 "$(CONFIG_EXTRA_LDLIBS)" \
Denys Vlasenkod7b502c2016-04-21 23:52:35 +0200616 && $(srctree)/scripts/generate_BUFSIZ.sh --post include/common_bufsiz.h
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000617
618# Generate System.map
Denis Vlasenkof7996f32007-01-11 17:20:00 +0000619quiet_cmd_sysmap = SYSMAP
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000620 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
621
622# Link of busybox
623# If CONFIG_KALLSYMS is set .version is already updated
624# Generate System.map and verify that the content is consistent
625# Use + in front of the busybox_version rule to silent warning with make -j2
626# First command is ':' to allow us to use + in front of the rule
627define rule_busybox__
628 :
629 $(call cmd,busybox__)
630 $(Q)echo 'cmd_$@ := $(cmd_busybox__)' > $(@D)/.$(@F).cmd
631endef
632
633
634ifdef CONFIG_KALLSYMS
635# Generate section listing all symbols and add it into busybox $(kallsyms.o)
636# It's a three stage process:
637# o .tmp_busybox1 has all symbols and sections, but __kallsyms is
638# empty
639# Running kallsyms on that gives us .tmp_kallsyms1.o with
640# the right size - busybox version (uname -v) is updated during this step
641# o .tmp_busybox2 now has a __kallsyms section of the right size,
642# but due to the added section, some addresses have shifted.
643# From here, we generate a correct .tmp_kallsyms2.o
644# o The correct .tmp_kallsyms2.o is linked into the final busybox.
645# o Verify that the System.map from busybox matches the map from
646# .tmp_busybox2, just in case we did not generate kallsyms correctly.
647# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
648# .tmp_busybox3 and .tmp_kallsyms3.o. This is only meant as a
649# temporary bypass to allow the kernel to be built while the
650# maintainers work out what went wrong with kallsyms.
651
652ifdef CONFIG_KALLSYMS_EXTRA_PASS
653last_kallsyms := 3
654else
655last_kallsyms := 2
Bernhard Reutner-Fischer7ca61b62006-01-15 14:04:57 +0000656endif
Bernhard Reutner-Fischer7ca61b62006-01-15 14:04:57 +0000657
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000658kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
Bernhard Reutner-Fischer7ca61b62006-01-15 14:04:57 +0000659
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000660define verify_kallsyms
661 $(Q)$(if $($(quiet)cmd_sysmap), \
662 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
663 $(cmd_sysmap) .tmp_busybox$(last_kallsyms) .tmp_System.map
664 $(Q)cmp -s System.map .tmp_System.map || \
665 (echo Inconsistent kallsyms data; \
666 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
667 rm .tmp_kallsyms* ; /bin/false )
668endef
669
670# Update busybox version before link
671# Use + in front of this rule to silent warning about make -j1
672# First command is ':' to allow us to use + in front of this rule
673cmd_ksym_ld = $(cmd_busybox__)
674define rule_ksym_ld
Denis Vlasenkof7996f32007-01-11 17:20:00 +0000675 :
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000676 +$(call cmd,busybox_version)
677 $(call cmd,busybox__)
678 $(Q)echo 'cmd_$@ := $(cmd_busybox__)' > $(@D)/.$(@F).cmd
679endef
680
681# Generate .S file with all kernel symbols
682quiet_cmd_kallsyms = KSYM $@
683 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
684 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
685
686.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
687 $(call if_changed_dep,as_o_S)
688
689.tmp_kallsyms%.S: .tmp_busybox% $(KALLSYMS)
690 $(call cmd,kallsyms)
691
692# .tmp_busybox1 must be complete except kallsyms, so update busybox version
693.tmp_busybox1: $(busybox-lds) $(busybox-all) FORCE
694 $(call if_changed_rule,ksym_ld)
695
696.tmp_busybox2: $(busybox-lds) $(busybox-all) .tmp_kallsyms1.o FORCE
697 $(call if_changed,busybox__)
698
699.tmp_busybox3: $(busybox-lds) $(busybox-all) .tmp_kallsyms2.o FORCE
700 $(call if_changed,busybox__)
701
702# Needs to visit scripts/ before $(KALLSYMS) can be used.
703$(KALLSYMS): scripts ;
704
705# Generate some data for debugging strange kallsyms problems
706debug_kallsyms: .tmp_map$(last_kallsyms)
707
708.tmp_map%: .tmp_busybox% FORCE
709 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
710
711.tmp_map3: .tmp_map2
712
713.tmp_map2: .tmp_map1
714
715endif # ifdef CONFIG_KALLSYMS
716
717# busybox image - including updated kernel symbols
718busybox_unstripped: $(busybox-all) FORCE
719 $(call if_changed_rule,busybox__)
720 $(Q)rm -f .old_version
Bernhard Reutner-Fischercfc5d862006-03-02 09:44:32 +0000721
722busybox: busybox_unstripped
Mike Frysinger5b5bcf22007-06-19 15:58:02 +0000723ifeq ($(SKIP_STRIP),y)
724 $(Q)cp $< $@
725else
Denis Vlasenko4e33e072006-10-16 18:24:57 +0000726 $(Q)$(STRIP) -s --remove-section=.note --remove-section=.comment \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000727 busybox_unstripped -o $@
Denis Vlasenkocc3f20b2008-06-23 22:31:52 +0000728# strip is confused by PIE executable and does not set exec bits
729 $(Q)chmod a+x $@
Mike Frysinger5b5bcf22007-06-19 15:58:02 +0000730endif
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000731
Denis Vlasenkof7996f32007-01-11 17:20:00 +0000732# The actual objects are generated when descending,
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000733# make sure no implicit rule kicks in
734$(sort $(busybox-all)): $(busybox-dirs) ;
Mike Frysinger586ea612006-04-21 01:18:07 +0000735
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000736# Handle descending into subdirectories listed in $(busybox-dirs)
737# Preset locale variables to speed up the build process. Limit locale
738# tweaks to this spot to avoid wrong language settings when running
739# make menuconfig etc.
740# Error messages still appears in the original language
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000741
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000742PHONY += $(busybox-dirs)
743$(busybox-dirs): prepare scripts
744 $(Q)$(MAKE) $(build)=$@
745
746# Build the kernel release string
747# The KERNELRELEASE is stored in a file named .kernelrelease
748# to be used when executing for example make install or make modules_install
749#
750# Take the contents of any files called localversion* and the config
751# variable CONFIG_LOCALVERSION and append them to KERNELRELEASE.
752# LOCALVERSION from the command line override all of this
753
754nullstring :=
755space := $(nullstring) # end of line
756
757___localver = $(objtree)/localversion* $(srctree)/localversion*
758__localver = $(sort $(wildcard $(___localver)))
759# skip backup files (containing '~')
760_localver = $(foreach f, $(__localver), $(if $(findstring ~, $(f)),,$(f)))
761
762localver = $(subst $(space),, \
763 $(shell cat /dev/null $(_localver)) \
764 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
Denis Vlasenkof7996f32007-01-11 17:20:00 +0000765
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000766# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
767# and if the SCM is know a tag from the SCM is appended.
768# The appended tag is determinded by the SCM used.
769#
770# Currently, only git is supported.
771# Other SCMs can edit scripts/setlocalversion and add the appropriate
772# checks as needed.
Mike Frysinger534b8d02008-02-07 22:44:27 +0000773ifdef _BB_DISABLED_CONFIG_LOCALVERSION_AUTO
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000774 _localver-auto = $(shell $(CONFIG_SHELL) \
775 $(srctree)/scripts/setlocalversion $(srctree))
776 localver-auto = $(LOCALVERSION)$(_localver-auto)
Eric Andersen13879102004-08-26 23:13:00 +0000777endif
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000778
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000779localver-full = $(localver)$(localver-auto)
Eric Andersen1f30a412002-04-13 13:39:48 +0000780
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000781# Store (new) KERNELRELASE string in .kernelrelease
782kernelrelease = $(KERNELVERSION)$(localver-full)
783.kernelrelease: FORCE
784 $(Q)rm -f $@
785 $(Q)echo $(kernelrelease) > $@
Eric Andersenbdfd0d72001-10-24 05:00:29 +0000786
Rob Landleyd9872aa2006-05-27 21:24:16 +0000787
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000788# Things we need to do before we recursively start building the kernel
789# or the modules are listed in "prepare".
790# A multi level approach is used. prepareN is processed before prepareN-1.
791# archprepare is used in arch Makefiles and when processed asm symlink,
792# version.h and scripts_basic is processed / created.
Rob Landleyd9872aa2006-05-27 21:24:16 +0000793
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000794# Listed in dependency order
795PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
Rob Landley16890752005-09-02 00:41:53 +0000796
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000797# prepare-all is deprecated, use prepare as valid replacement
798PHONY += prepare-all
Rob Landleyd9872aa2006-05-27 21:24:16 +0000799
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000800# prepare3 is used to check if we are building in a separate output directory,
801# and if so do:
802# 1) Check that make has not been executed in the kernel src $(srctree)
803# 2) Create the include2 directory, used for the second asm symlink
804prepare3: .kernelrelease
805ifneq ($(KBUILD_SRC),)
Denis Vlasenkoff65cd42007-08-12 20:59:07 +0000806 @echo ' Using $(srctree) as source for busybox'
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000807 $(Q)if [ -f $(srctree)/.config ]; then \
808 echo " $(srctree) is not clean, please run 'make mrproper'";\
809 echo " in the '$(srctree)' directory.";\
810 /bin/false; \
Bernhard Reutner-Fischerdf100942006-03-13 19:04:00 +0000811 fi;
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000812 $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
813 $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
814endif
Eric Andersen85208e22002-04-12 12:05:57 +0000815
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000816# prepare2 creates a makefile if using a separate output directory
817prepare2: prepare3 outputmakefile
Eric Andersencc8ed391999-10-05 16:24:54 +0000818
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000819prepare1: prepare2 include/config/MARKER
820ifneq ($(KBUILD_MODULES),)
821 $(Q)mkdir -p $(MODVERDIR)
822 $(Q)rm -f $(MODVERDIR)/*
823endif
Eric Andersencc8ed391999-10-05 16:24:54 +0000824
Denys Vlasenkob24c1132009-11-24 22:23:21 +0100825archprepare: prepare1 scripts_basic applets_dir
Mark Whitleydd23b8b2000-07-10 23:00:47 +0000826
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000827prepare0: archprepare FORCE
828 $(Q)$(MAKE) $(build)=.
Matt Kraai4e05da82001-11-19 19:47:56 +0000829
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000830# All the preparing..
831prepare prepare-all: prepare0
Bernhard Reutner-Fischerfa61ca72006-06-16 17:19:39 +0000832
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000833# Leave this as default for preprocessing busybox.lds.S, which is now
834# done in arch/$(ARCH)/kernel/Makefile
835
836export CPPFLAGS_busybox.lds += -P -C -U$(ARCH)
837
838# FIXME: The asm symlink changes when $(ARCH) changes. That's
839# hard to detect, but I suppose "make mrproper" is a good idea
840# before switching between archs anyway.
841
842#bbox# include/asm:
843#bbox# @echo ' SYMLINK $@ -> include/asm-$(ARCH)'
844#bbox# $(Q)if [ ! -d include ]; then mkdir -p include; fi;
845#bbox# @ln -fsn asm-$(ARCH) $@
846
847# Split autoconf.h into include/linux/config/*
Mike Frysingerd514ba22006-12-31 11:46:19 +0000848quiet_cmd_gen_bbconfigopts = GEN include/bbconfigopts.h
Denys Vlasenko9ce07e72010-08-29 14:36:11 +0200849 cmd_gen_bbconfigopts = $(srctree)/scripts/mkconfigs include/bbconfigopts.h include/bbconfigopts_bz2.h
Denys Vlasenkoe6a2f4c2016-04-21 16:26:30 +0200850quiet_cmd_gen_common_bufsiz = GEN include/common_bufsiz.h
851 cmd_gen_common_bufsiz = $(srctree)/scripts/generate_BUFSIZ.sh include/common_bufsiz.h
Mike Frysingerd514ba22006-12-31 11:46:19 +0000852quiet_cmd_split_autoconf = SPLIT include/autoconf.h -> include/config/*
853 cmd_split_autoconf = scripts/basic/split-include include/autoconf.h include/config
Denys Vlasenko4f2ef4a2018-11-01 09:53:25 +0100854quiet_cmd_gen_embedded_scripts = GEN include/embedded_scripts.h
Ron Yorston37788982018-11-17 17:48:14 +0000855 cmd_gen_embedded_scripts = $(srctree)/scripts/embedded_scripts include/embedded_scripts.h $(srctree)/embed $(srctree)/applets_sh
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000856#bbox# piggybacked generation of few .h files
Ron Yorston7b42f8f2018-11-21 10:11:01 +0000857include/config/MARKER: scripts/basic/split-include include/autoconf.h $(wildcard $(srctree)/embed/*) $(wildcard $(srctree)/applets_sh/*) $(srctree)/scripts/embedded_scripts
Mike Frysingerd514ba22006-12-31 11:46:19 +0000858 $(call cmd,split_autoconf)
859 $(call cmd,gen_bbconfigopts)
Denys Vlasenkoe6a2f4c2016-04-21 16:26:30 +0200860 $(call cmd,gen_common_bufsiz)
Denys Vlasenko4f2ef4a2018-11-01 09:53:25 +0100861 $(call cmd,gen_embedded_scripts)
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000862 @touch $@
863
864# Generate some files
865# ---------------------------------------------------------------------------
866
867# KERNELRELEASE can change from a few different places, meaning version.h
868# needs to be updated, so this check is forced on all builds
869
870uts_len := 64
871
872define filechk_version.h
873 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
874 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
875 exit 1; \
876 fi; \
877 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
878 echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
879 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
880 )
881endef
882
883# ---------------------------------------------------------------------------
884
885PHONY += depend dep
886depend dep:
887 @echo '*** Warning: make $@ is unnecessary now.'
888
889# ---------------------------------------------------------------------------
890# Modules
891
Mike Frysinger61160dd2008-01-27 09:41:24 +0000892ifdef _BB_DISABLED_CONFIG_MODULES
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000893
894# By default, build modules as well
895
896all: modules
897
898# Build modules
899
900PHONY += modules
901modules: $(busybox-dirs) $(if $(KBUILD_BUILTIN),busybox)
902 @echo ' Building modules, stage 2.';
903 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
Bernhard Reutner-Fischerfa61ca72006-06-16 17:19:39 +0000904
Bernhard Reutner-Fischer07a79e72006-03-09 09:03:37 +0000905
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000906# Target to prepare building external modules
907PHONY += modules_prepare
908modules_prepare: prepare scripts
Bernhard Reutner-Fischerdf100942006-03-13 19:04:00 +0000909
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000910# Target to install modules
911PHONY += modules_install
912modules_install: _modinst_ _modinst_post
913
914PHONY += _modinst_
915_modinst_:
916 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
917 echo "Warning: you may need to install module-init-tools"; \
918 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
919 sleep 1; \
920 fi
921 @rm -rf $(MODLIB)/kernel
922 @rm -f $(MODLIB)/source
923 @mkdir -p $(MODLIB)/kernel
924 @ln -s $(srctree) $(MODLIB)/source
925 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
926 rm -f $(MODLIB)/build ; \
927 ln -s $(objtree) $(MODLIB)/build ; \
928 fi
929 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
930
931# If System.map exists, run depmod. This deliberately does not have a
932# dependency on System.map since that would run the dependency tree on
933# busybox. This depmod is only for convenience to give the initial
934# boot a modules.dep even before / is mounted read-write. However the
935# boot script depmod is the master version.
936ifeq "$(strip $(INSTALL_MOD_PATH))" ""
937depmod_opts :=
938else
939depmod_opts := -b $(INSTALL_MOD_PATH) -r
940endif
941PHONY += _modinst_post
942_modinst_post: _modinst_
943 if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
944
945else # CONFIG_MODULES
946
947# Modules not configured
948# ---------------------------------------------------------------------------
949
950modules modules_install: FORCE
951 @echo
Denis Vlasenkoeb98be02006-11-30 22:40:32 +0000952 @echo "The present busybox configuration has modules disabled."
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000953 @echo "Type 'make config' and enable loadable module support."
954 @echo "Then build a kernel with module support enabled."
955 @echo
956 @exit 1
957
958endif # CONFIG_MODULES
959
960###
961# Cleaning is done on three levels.
962# make clean Delete most generated files
963# Leave enough to build external modules
964# make mrproper Delete the current configuration, and all generated files
965# make distclean Remove editor backup files, patch leftover files and the like
966
967# Directories & files removed with 'make clean'
Denis Vlasenko2b68c8f2008-07-20 18:37:54 +0000968CLEAN_DIRS += $(MODVERDIR) _install 0_lib
969CLEAN_FILES += busybox busybox_unstripped* busybox.links \
970 System.map .kernelrelease \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000971 .tmp_kallsyms* .tmp_version .tmp_busybox* .tmp_System.map
972
973# Directories & files removed with 'make mrproper'
974MRPROPER_DIRS += include/config include2
975MRPROPER_FILES += .config .config.old include/asm .version .old_version \
Denys Vlasenkod488f5e2011-06-07 10:01:58 +0200976 include/NUM_APPLETS.h \
Denys Vlasenkoe6a2f4c2016-04-21 16:26:30 +0200977 include/common_bufsiz.h \
Denis Vlasenko8bf7bb82006-10-05 17:42:55 +0000978 include/autoconf.h \
979 include/bbconfigopts.h \
Denys Vlasenkod488f5e2011-06-07 10:01:58 +0200980 include/bbconfigopts_bz2.h \
Denys Vlasenko4f2ef4a2018-11-01 09:53:25 +0100981 include/embedded_scripts.h \
Denis Vlasenko8bf7bb82006-10-05 17:42:55 +0000982 include/usage_compressed.h \
Denis Vlasenko1aa7e472007-11-28 06:49:03 +0000983 include/applet_tables.h \
Denys Vlasenkod488f5e2011-06-07 10:01:58 +0200984 include/applets.h \
985 include/usage.h \
Denis Vlasenko1aa7e472007-11-28 06:49:03 +0000986 applets/usage \
Denis Vlasenko2b68c8f2008-07-20 18:37:54 +0000987 .kernelrelease Module.symvers tags TAGS cscope* \
988 busybox_old
Denis Vlasenko7d219aa2006-10-05 10:17:08 +0000989
990# clean - Delete most, but leave enough to build external modules
991#
992clean: rm-dirs := $(CLEAN_DIRS)
993clean: rm-files := $(CLEAN_FILES)
994clean-dirs := $(addprefix _clean_,$(srctree) $(busybox-alldirs))
995
996PHONY += $(clean-dirs) clean archclean
997$(clean-dirs):
998 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
999
1000clean: archclean $(clean-dirs)
1001 $(call cmd,rmdirs)
1002 $(call cmd,rmfiles)
1003 @find . $(RCS_FIND_IGNORE) \
Denis Vlasenko52ec4b92008-07-12 23:02:43 +00001004 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001005 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1006 -type f -print | xargs rm -f
1007
Bernhard Reutner-Fischer8eeaa742008-08-21 13:47:20 +00001008PHONY += doc-clean
1009doc-clean: rm-files := docs/busybox.pod \
Denys Vlasenko17fc33d2010-10-24 03:46:16 +02001010 docs/BusyBox.html docs/busybox.1 docs/BusyBox.txt
Bernhard Reutner-Fischer8eeaa742008-08-21 13:47:20 +00001011doc-clean:
1012 $(call cmd,rmfiles)
1013
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001014# mrproper - Delete all generated files, including .config
1015#
1016mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1017mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
Denis Vlasenko8bf7bb82006-10-05 17:42:55 +00001018mrproper-dirs := $(addprefix _mrproper_,scripts)
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001019
1020PHONY += $(mrproper-dirs) mrproper archmrproper
1021$(mrproper-dirs):
1022 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1023
1024mrproper: clean archmrproper $(mrproper-dirs)
1025 $(call cmd,rmdirs)
1026 $(call cmd,rmfiles)
Chris Rees12caabf2010-11-30 09:41:39 +01001027 @find . -name Config.src | sed 's/.src$$/.in/' | xargs -r rm -f
1028 @find . -name Kbuild.src | sed 's/.src$$//' | xargs -r rm -f
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001029
1030# distclean
1031#
1032PHONY += distclean
1033
1034distclean: mrproper
1035 @find $(srctree) $(RCS_FIND_IGNORE) \
Denis Vlasenko52ec4b92008-07-12 23:02:43 +00001036 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001037 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
Denis Vlasenko52ec4b92008-07-12 23:02:43 +00001038 -o -name '.*.rej' -o -name '*.tmp' -o -size 0 \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001039 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1040 -type f -print | xargs rm -f
1041
1042
1043# Packaging of the kernel to various formats
1044# ---------------------------------------------------------------------------
1045# rpm target kept for backward compatibility
1046package-dir := $(srctree)/scripts/package
1047
1048%pkg: FORCE
1049 $(Q)$(MAKE) $(build)=$(package-dir) $@
1050rpm: FORCE
1051 $(Q)$(MAKE) $(build)=$(package-dir) $@
1052
1053
1054# Brief documentation of the typical targets used
1055# ---------------------------------------------------------------------------
1056
Daniel Fandrich126f2b22011-07-08 07:59:16 +02001057boards := $(wildcard $(srctree)/configs/*_defconfig)
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001058boards := $(notdir $(boards))
1059
Denis Vlasenko14aa9f72006-10-31 23:03:09 +00001060-include $(srctree)/Makefile.help
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001061
1062# Documentation targets
1063# ---------------------------------------------------------------------------
1064%docs: scripts_basic FORCE
1065 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1066
1067else # KBUILD_EXTMOD
1068
1069###
1070# External module support.
1071# When building external modules the kernel used as basis is considered
1072# read-only, and no consistency checks are made and the make
1073# system is not used on the basis kernel. If updates are required
1074# in the basis kernel ordinary make commands (without M=...) must
1075# be used.
1076#
1077# The following are the only valid targets when building external
1078# modules.
1079# make M=dir clean Delete all automatically generated files
1080# make M=dir modules Make all modules in specified dir
1081# make M=dir Same as 'make M=dir modules'
1082# make M=dir modules_install
1083# Install the modules build in the module directory
1084# Assumes install directory is already created
1085
1086# We are always building modules
1087KBUILD_MODULES := 1
1088PHONY += crmodverdir
1089crmodverdir:
1090 $(Q)mkdir -p $(MODVERDIR)
1091 $(Q)rm -f $(MODVERDIR)/*
1092
1093PHONY += $(objtree)/Module.symvers
1094$(objtree)/Module.symvers:
1095 @test -e $(objtree)/Module.symvers || ( \
1096 echo; \
1097 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1098 echo " is missing; modules will have no dependencies and modversions."; \
1099 echo )
1100
1101module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1102PHONY += $(module-dirs) modules
1103$(module-dirs): crmodverdir $(objtree)/Module.symvers
1104 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1105
1106modules: $(module-dirs)
1107 @echo ' Building modules, stage 2.';
1108 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1109
1110PHONY += modules_install
1111modules_install: _emodinst_ _emodinst_post
1112
1113install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1114PHONY += _emodinst_
1115_emodinst_:
1116 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1117 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
1118
1119# Run depmod only is we have System.map and depmod is executable
1120quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1121 cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \
1122 $(DEPMOD) -ae -F System.map \
1123 $(if $(strip $(INSTALL_MOD_PATH)), \
1124 -b $(INSTALL_MOD_PATH) -r) \
1125 $(KERNELRELEASE); \
1126 fi
1127
1128PHONY += _emodinst_post
1129_emodinst_post: _emodinst_
1130 $(call cmd,depmod)
1131
1132clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1133
1134PHONY += $(clean-dirs) clean
1135$(clean-dirs):
1136 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1137
1138clean: rm-dirs := $(MODVERDIR)
1139clean: $(clean-dirs)
1140 $(call cmd,rmdirs)
1141 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
Denis Vlasenko52ec4b92008-07-12 23:02:43 +00001142 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001143 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1144 -type f -print | xargs rm -f
1145
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001146# Dummies...
1147PHONY += prepare scripts
1148prepare: ;
1149scripts: ;
1150endif # KBUILD_EXTMOD
1151
1152# Generate tags for editors
1153# ---------------------------------------------------------------------------
1154
1155#We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1156#(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1157#Adding $(srctree) adds about 20M on i386 to the size of the output file!
1158
1159ifeq ($(src),$(obj))
1160__srctree =
1161else
1162__srctree = $(srctree)/
1163endif
1164
1165ifeq ($(ALLSOURCE_ARCHS),)
1166ifeq ($(ARCH),um)
1167ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1168else
1169ALLINCLUDE_ARCHS := $(ARCH)
1170endif
1171else
1172#Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1173ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1174endif
1175
1176ALLSOURCE_ARCHS := $(ARCH)
1177
1178define all-sources
Bartosz Golaszewski6c19d352014-12-17 17:58:23 +01001179 ( find -regex '.*\.[ch]$$' )
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001180endef
1181
1182quiet_cmd_cscope-file = FILELST cscope.files
1183 cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1184
1185quiet_cmd_cscope = MAKE cscope.out
1186 cmd_cscope = cscope -b
1187
1188cscope: FORCE
1189 $(call cmd,cscope-file)
1190 $(call cmd,cscope)
1191
1192quiet_cmd_TAGS = MAKE $@
1193define cmd_TAGS
1194 rm -f $@; \
1195 ETAGSF=`etags --version | grep -i exuberant >/dev/null && \
1196 echo "-I __initdata,__exitdata,__acquires,__releases \
1197 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1198 --extra=+f --c-kinds=+px"`; \
1199 $(all-sources) | xargs etags $$ETAGSF -a
1200endef
1201
1202TAGS: FORCE
1203 $(call cmd,TAGS)
1204
1205
1206quiet_cmd_tags = MAKE $@
1207define cmd_tags
1208 rm -f $@; \
1209 CTAGSF=`ctags --version | grep -i exuberant >/dev/null && \
1210 echo "-I __initdata,__exitdata,__acquires,__releases \
1211 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1212 --extra=+f --c-kinds=+px"`; \
1213 $(all-sources) | xargs ctags $$CTAGSF -a
1214endef
1215
1216tags: FORCE
1217 $(call cmd,tags)
1218
1219
1220# Scripts to check various things for consistency
1221# ---------------------------------------------------------------------------
1222
1223includecheck:
1224 find * $(RCS_FIND_IGNORE) \
1225 -name '*.[hcS]' -type f -print | sort \
1226 | xargs $(PERL) -w scripts/checkincludes.pl
1227
1228versioncheck:
1229 find * $(RCS_FIND_IGNORE) \
1230 -name '*.[hcS]' -type f -print | sort \
1231 | xargs $(PERL) -w scripts/checkversion.pl
1232
1233namespacecheck:
1234 $(PERL) $(srctree)/scripts/namespace.pl
1235
1236endif #ifeq ($(config-targets),1)
1237endif #ifeq ($(mixed-targets),1)
1238
1239PHONY += checkstack
1240checkstack:
1241 $(OBJDUMP) -d busybox $$(find . -name '*.ko') | \
1242 $(PERL) $(src)/scripts/checkstack.pl $(ARCH)
1243
1244kernelrelease:
1245 $(if $(wildcard .kernelrelease), $(Q)echo $(KERNELRELEASE), \
1246 $(error kernelrelease not valid - run 'make *config' to update it))
1247kernelversion:
1248 @echo $(KERNELVERSION)
1249
1250# Single targets
1251# ---------------------------------------------------------------------------
1252# Single targets are compatible with:
1253# - build whith mixed source and output
1254# - build with separate output dir 'make O=...'
1255# - external modules
1256#
1257# target-dir => where to store outputfile
1258# build-dir => directory in kernel source tree to use
1259
1260ifeq ($(KBUILD_EXTMOD),)
1261 build-dir = $(patsubst %/,%,$(dir $@))
1262 target-dir = $(dir $@)
1263else
1264 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1265 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1266 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1267endif
1268
1269%.s: %.c prepare scripts FORCE
1270 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1271%.i: %.c prepare scripts FORCE
1272 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1273%.o: %.c prepare scripts FORCE
1274 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1275%.lst: %.c prepare scripts FORCE
1276 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1277%.s: %.S prepare scripts FORCE
1278 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1279%.o: %.S prepare scripts FORCE
1280 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1281
1282# Modules
Denys Vlasenkoadbe3b52010-08-22 09:28:46 +02001283%/: prepare scripts FORCE
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001284 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1285 $(build)=$(build-dir)
Denys Vlasenkoadbe3b52010-08-22 09:28:46 +02001286/: prepare scripts FORCE
1287 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1288 $(build)=$(build-dir)
1289
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001290%.ko: prepare scripts FORCE
1291 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1292 $(build)=$(build-dir) $(@:.ko=.o)
1293 $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
1294
Denis Vlasenkof7996f32007-01-11 17:20:00 +00001295# FIXME Should go into a make.lib or something
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001296# ===========================================================================
1297
1298quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1299 cmd_rmdirs = rm -rf $(rm-dirs)
1300
1301quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1302 cmd_rmfiles = rm -f $(rm-files)
1303
1304
1305a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1306 $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1307 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
1308
1309quiet_cmd_as_o_S = AS $@
1310cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1311
1312# read all saved command lines
1313
1314targets := $(wildcard $(sort $(targets)))
1315cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1316
1317ifneq ($(cmd_files),)
1318 $(cmd_files): ; # Do not try to update included dependency files
1319 include $(cmd_files)
1320endif
1321
1322# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1323# Usage:
1324# $(Q)$(MAKE) $(clean)=dir
1325clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1326
1327endif # skip-makefile
1328
1329PHONY += FORCE
1330FORCE:
1331
Denis Vlasenko14aa9f72006-10-31 23:03:09 +00001332-include $(srctree)/Makefile.custom
Denis Vlasenko7d219aa2006-10-05 10:17:08 +00001333
1334# Declare the contents of the .PHONY variable as phony. We keep that
1335# information in a variable se we can use it in if_changed and friends.
1336.PHONY: $(PHONY)