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1	VERSION = 2
2	PATCHLEVEL = 6
3	SUBLEVEL = 37
4	EXTRAVERSION =
5	NAME = Flesh-Eating Bats with Fangs
6
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:
14	# o use make's built-in rules and variables
15	# (this increases performance and avoids hard-to-debug behaviour);
16	# o print "Entering directory ...";
17	MAKEFLAGS += -rR --no-print-directory
18
19	# Avoid funny character set dependencies
20	unexport LC_ALL
21	LC_COLLATE=C
22	LC_NUMERIC=C
23	export LC_COLLATE LC_NUMERIC
24
25	# We are using a recursive build, so we need to do a little thinking
26	# to get the ordering right.
27	#
28	# Most importantly: sub-Makefiles should only ever modify files in
29	# their own directory. If in some directory we have a dependency on
30	# a file in another dir (which doesn't happen often, but it's often
31	# unavoidable when linking the built-in.o targets which finally
32	# turn into vmlinux), we will call a sub make in that other dir, and
33	# after that we are sure that everything which is in that other dir
34	# is now up to date.
35	#
36	# The only cases where we need to modify files which have global
37	# effects are thus separated out and done before the recursive
38	# descending is started. They are now explicitly listed as the
39	# prepare rule.
40
41	# To put more focus on warnings, be less verbose as default
42	# Use 'make V=1' to see the full commands
43
44	ifeq ("$(origin V)", "command line")
45	KBUILD_VERBOSE = $(V)
46	endif
47	ifndef KBUILD_VERBOSE
48	KBUILD_VERBOSE = 0
49	endif
50
51	# Call a source code checker (by default, "sparse") as part of the
52	# C compilation.
53	#
54	# Use 'make C=1' to enable checking of only re-compiled files.
55	# Use 'make C=2' to enable checking of all source files, regardless
56	# of whether they are re-compiled or not.
57	#
58	# See the file "Documentation/sparse.txt" for more details, including
59	# where to get the "sparse" utility.
60
61	ifeq ("$(origin C)", "command line")
62	KBUILD_CHECKSRC = $(C)
63	endif
64	ifndef KBUILD_CHECKSRC
65	KBUILD_CHECKSRC = 0
66	endif
67
68	# Use make M=dir to specify directory of external module to build
69	# Old syntax make ... SUBDIRS=$PWD is still supported
70	# Setting the environment variable KBUILD_EXTMOD take precedence
71	ifdef SUBDIRS
72	KBUILD_EXTMOD ?= $(SUBDIRS)
73	endif
74
75	ifeq ("$(origin M)", "command line")
76	KBUILD_EXTMOD := $(M)
77	endif
78
79	# kbuild supports saving output files in a separate directory.
80	# To locate output files in a separate directory two syntaxes are supported.
81	# In both cases the working directory must be the root of the kernel src.
82	# 1) O=
83	# Use "make O=dir/to/store/output/files/"
84	#
85	# 2) Set KBUILD_OUTPUT
86	# Set the environment variable KBUILD_OUTPUT to point to the directory
87	# where the output files shall be placed.
88	# export KBUILD_OUTPUT=dir/to/store/output/files/
89	# make
90	#
91	# The O= assignment takes precedence over the KBUILD_OUTPUT environment
92	# variable.
93
94
95	# KBUILD_SRC is set on invocation of make in OBJ directory
96	# KBUILD_SRC is not intended to be used by the regular user (for now)
97	ifeq ($(KBUILD_SRC),)
98
99	# OK, Make called in directory where kernel src resides
100	# Do we want to locate output files in a separate directory?
101	ifeq ("$(origin O)", "command line")
102	KBUILD_OUTPUT := $(O)
103	endif
104
105	# That's our default target when none is given on the command line
106	PHONY := _all
107	_all:
108
109	# Cancel implicit rules on top Makefile
110	$(CURDIR)/Makefile Makefile: ;
111
112	ifneq ($(KBUILD_OUTPUT),)
113	# Invoke a second make in the output directory, passing relevant variables
114	# check that the output directory actually exists
115	saved-output := $(KBUILD_OUTPUT)
116	KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
117	$(if $(KBUILD_OUTPUT),, \
118	$(error output directory "$(saved-output)" does not exist))
119
120	PHONY += $(MAKECMDGOALS) sub-make
121
122	$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
123	$(Q)@:
124
125	sub-make: FORCE
126	$(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
127	KBUILD_SRC=$(CURDIR) \
128	KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
129	$(filter-out _all sub-make,$(MAKECMDGOALS))
130
131	# Leave processing to above invocation of make
132	skip-makefile := 1
133	endif # ifneq ($(KBUILD_OUTPUT),)
134	endif # ifeq ($(KBUILD_SRC),)
135
136	# We process the rest of the Makefile if this is the final invocation of make
137	ifeq ($(skip-makefile),)
138
139	# If building an external module we do not care about the all: rule
140	# but instead _all depend on modules
141	PHONY += all
142	ifeq ($(KBUILD_EXTMOD),)
143	_all: all
144	else
145	_all: modules
146	endif
147
148	srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
149	objtree := $(CURDIR)
150	src := $(srctree)
151	obj := $(objtree)
152
153	VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
154
155	export srctree objtree VPATH
156
157
158	# SUBARCH tells the usermode build what the underlying arch is. That is set
159	# first, and if a usermode build is happening, the "ARCH=um" on the command
160	# line overrides the setting of ARCH below. If a native build is happening,
161	# then ARCH is assigned, getting whatever value it gets normally, and
162	# SUBARCH is subsequently ignored.
163
164	SUBARCH := $(shell uname -m \| sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
165	-e s/arm.*/arm/ -e s/sa110/arm/ \
166	-e s/s390x/s390/ -e s/parisc64/parisc/ \
167	-e s/ppc./powerpc/ -e s/mips./mips/ \
168	-e s/sh[234].*/sh/ )
169
170	# Cross compiling and selecting different set of gcc/bin-utils
171	# ---------------------------------------------------------------------------
172	#
173	# When performing cross compilation for other architectures ARCH shall be set
174	# to the target architecture. (See arch/* for the possibilities).
175	# ARCH can be set during invocation of make:
176	# make ARCH=ia64
177	# Another way is to have ARCH set in the environment.
178	# The default ARCH is the host where make is executed.
179
180	# CROSS_COMPILE specify the prefix used for all executables used
181	# during compilation. Only gcc and related bin-utils executables
182	# are prefixed with $(CROSS_COMPILE).
183	# CROSS_COMPILE can be set on the command line
184	# make CROSS_COMPILE=ia64-linux-
185	# Alternatively CROSS_COMPILE can be set in the environment.
186	# A third alternative is to store a setting in .config so that plain
187	# "make" in the configured kernel build directory always uses that.
188	# Default value for CROSS_COMPILE is not to prefix executables
189	# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
190	export KBUILD_BUILDHOST := $(SUBARCH)
191	ARCH ?= $(SUBARCH)
192	CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
193
194	# Architecture as present in compile.h
195	UTS_MACHINE := $(ARCH)
196	SRCARCH := $(ARCH)
197
198	# Additional ARCH settings for x86
199	ifeq ($(ARCH),i386)
200	SRCARCH := x86
201	endif
202	ifeq ($(ARCH),x86_64)
203	SRCARCH := x86
204	endif
205
206	# Additional ARCH settings for sparc
207	ifeq ($(ARCH),sparc32)
208	SRCARCH := sparc
209	endif
210	ifeq ($(ARCH),sparc64)
211	SRCARCH := sparc
212	endif
213
214	# Additional ARCH settings for sh
215	ifeq ($(ARCH),sh64)
216	SRCARCH := sh
217	endif
218
219	# Where to locate arch specific headers
220	hdr-arch := $(SRCARCH)
221
222	ifeq ($(ARCH),m68knommu)
223	hdr-arch := m68k
224	endif
225
226	KCONFIG_CONFIG ?= .config
227
228	# SHELL used by kbuild
229	CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
230	else if [ -x /bin/bash ]; then echo /bin/bash; \
231	else echo sh; fi ; fi)
232
233	HOSTCC = gcc
234	HOSTCXX = g++
235	HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
236	HOSTCXXFLAGS = -O2
237
238	# Decide whether to build built-in, modular, or both.
239	# Normally, just do built-in.
240
241	KBUILD_MODULES :=
242	KBUILD_BUILTIN := 1
243
244	# If we have only "make modules", don't compile built-in objects.
245	# When we're building modules with modversions, we need to consider
246	# the built-in objects during the descend as well, in order to
247	# make sure the checksums are up to date before we record them.
248
249	ifeq ($(MAKECMDGOALS),modules)
250	KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
251	endif
252
253	# If we have "make <whatever> modules", compile modules
254	# in addition to whatever we do anyway.
255	# Just "make" or "make all" shall build modules as well
256
257	ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
258	KBUILD_MODULES := 1
259	endif
260
261	ifeq ($(MAKECMDGOALS),)
262	KBUILD_MODULES := 1
263	endif
264
265	export KBUILD_MODULES KBUILD_BUILTIN
266	export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
267
268	# Beautify output
269	# ---------------------------------------------------------------------------
270	#
271	# Normally, we echo the whole command before executing it. By making
272	# that echo $($(quiet)$(cmd)), we now have the possibility to set
273	# $(quiet) to choose other forms of output instead, e.g.
274	#
275	# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
276	# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
277	#
278	# If $(quiet) is empty, the whole command will be printed.
279	# If it is set to "quiet_", only the short version will be printed.
280	# If it is set to "silent_", nothing will be printed at all, since
281	# the variable $(silent_cmd_cc_o_c) doesn't exist.
282	#
283	# A simple variant is to prefix commands with $(Q) - that's useful
284	# for commands that shall be hidden in non-verbose mode.
285	#
286	# $(Q)ln $@ :<
287	#
288	# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
289	# If KBUILD_VERBOSE equals 1 then the above command is displayed.
290
291	ifeq ($(KBUILD_VERBOSE),1)
292	quiet =
293	Q =
294	else
295	quiet=quiet_
296	Q = @
297	endif
298
299	# If the user is running make -s (silent mode), suppress echoing of
300	# commands
301
302	ifneq ($(findstring s,$(MAKEFLAGS)),)
303	quiet=silent_
304	endif
305
306	export quiet Q KBUILD_VERBOSE
307
308
309	# Look for make include files relative to root of kernel src
310	MAKEFLAGS += --include-dir=$(srctree)
311
312	# We need some generic definitions (do not try to remake the file).
313	$(srctree)/scripts/Kbuild.include: ;
314	include $(srctree)/scripts/Kbuild.include
315
316	# Make variables (CC, etc...)
317
318	AS = $(CROSS_COMPILE)as
319	LD = $(CROSS_COMPILE)ld
320	CC = $(CROSS_COMPILE)gcc
321	CPP = $(CC) -E
322	AR = $(CROSS_COMPILE)ar
323	NM = $(CROSS_COMPILE)nm
324	STRIP = $(CROSS_COMPILE)strip
325	OBJCOPY = $(CROSS_COMPILE)objcopy
326	OBJDUMP = $(CROSS_COMPILE)objdump
327	AWK = awk
328	GENKSYMS = scripts/genksyms/genksyms
329	INSTALLKERNEL := installkernel
330	DEPMOD = /sbin/depmod
331	KALLSYMS = scripts/kallsyms
332	PERL = perl
333	CHECK = sparse
334
335	CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
336	-Wbitwise -Wno-return-void $(CF)
337	CFLAGS_MODULE =
338	AFLAGS_MODULE =
339	LDFLAGS_MODULE =
340	CFLAGS_KERNEL =
341	AFLAGS_KERNEL =
342	CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
343
344
345	# Use LINUXINCLUDE when you must reference the include/ directory.
346	# Needed to be compatible with the O= option
347	LINUXINCLUDE := -I$(srctree)/arch/$(hdr-arch)/include -Iinclude \
348	$(if $(KBUILD_SRC), -I$(srctree)/include) \
349	-include include/generated/autoconf.h
350
351	KBUILD_CPPFLAGS := -D__KERNEL__
352
353	KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
354	-fno-strict-aliasing -fno-common \
355	-Werror-implicit-function-declaration \
356	-Wno-format-security \
357	-fno-delete-null-pointer-checks
358	KBUILD_AFLAGS_KERNEL :=
359	KBUILD_CFLAGS_KERNEL :=
360	KBUILD_AFLAGS := -D__ASSEMBLY__
361	KBUILD_AFLAGS_MODULE := -DMODULE
362	KBUILD_CFLAGS_MODULE := -DMODULE
363	KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
364
365	# Read KERNELRELEASE from include/config/kernel.release (if it exists)
366	KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
367	KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
368
369	export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
370	export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
371	export CPP AR NM STRIP OBJCOPY OBJDUMP
372	export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
373	export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
374
375	export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
376	export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
377	export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
378	export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
379	export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
380
381	# When compiling out-of-tree modules, put MODVERDIR in the module
382	# tree rather than in the kernel tree. The kernel tree might
383	# even be read-only.
384	export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
385
386	# Files to ignore in find ... statements
387
388	RCS_FIND_IGNORE := $ -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git $ -prune -o
389	export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
390
391	# ===========================================================================
392	# Rules shared between *config targets and build targets
393
394	# Basic helpers built in scripts/
395	PHONY += scripts_basic
396	scripts_basic:
397	$(Q)$(MAKE) $(build)=scripts/basic
398	$(Q)rm -f .tmp_quiet_recordmcount
399
400	# To avoid any implicit rule to kick in, define an empty command.
401	scripts/basic/%: scripts_basic ;
402
403	PHONY += outputmakefile
404	# outputmakefile generates a Makefile in the output directory, if using a
405	# separate output directory. This allows convenient use of make in the
406	# output directory.
407	outputmakefile:
408	ifneq ($(KBUILD_SRC),)
409	$(Q)ln -fsn $(srctree) source
410	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
411	$(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
412	endif
413
414	# To make sure we do not include .config for any of the *config targets
415	# catch them early, and hand them over to scripts/kconfig/Makefile
416	# It is allowed to specify more targets when calling make, including
417	# mixing *config targets and build targets.
418	# For example 'make oldconfig all'.
419	# Detect when mixed targets is specified, and make a second invocation
420	# of make so .config is not included in this case either (for *config).
421
422	no-dot-config-targets := clean mrproper distclean \
423	cscope TAGS tags help %docs check% coccicheck \
424	include/linux/version.h headers_% \
425	kernelversion %src-pkg
426
427	config-targets := 0
428	mixed-targets := 0
429	dot-config := 1
430
431	ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
432	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
433	dot-config := 0
434	endif
435	endif
436
437	ifeq ($(KBUILD_EXTMOD),)
438	ifneq ($(filter config %config,$(MAKECMDGOALS)),)
439	config-targets := 1
440	ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
441	mixed-targets := 1
442	endif
443	endif
444	endif
445
446	ifeq ($(mixed-targets),1)
447	# ===========================================================================
448	# We're called with mixed targets (*config and build targets).
449	# Handle them one by one.
450
451	%:: FORCE
452	$(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
453
454	else
455	ifeq ($(config-targets),1)
456	# ===========================================================================
457	# *config targets only - make sure prerequisites are updated, and descend
458	# in scripts/kconfig to make the *config target
459
460	# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
461	# KBUILD_DEFCONFIG may point out an alternative default configuration
462	# used for 'make defconfig'
463	include $(srctree)/arch/$(SRCARCH)/Makefile
464	export KBUILD_DEFCONFIG KBUILD_KCONFIG
465
466	config: scripts_basic outputmakefile FORCE
467	$(Q)mkdir -p include/linux include/config
468	$(Q)$(MAKE) $(build)=scripts/kconfig $@
469
470	%config: scripts_basic outputmakefile FORCE
471	$(Q)mkdir -p include/linux include/config
472	$(Q)$(MAKE) $(build)=scripts/kconfig $@
473
474	else
475	# ===========================================================================
476	# Build targets only - this includes vmlinux, arch specific targets, clean
477	# targets and others. In general all targets except *config targets.
478
479	ifeq ($(KBUILD_EXTMOD),)
480	# Additional helpers built in scripts/
481	# Carefully list dependencies so we do not try to build scripts twice
482	# in parallel
483	PHONY += scripts
484	scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
485	$(Q)$(MAKE) $(build)=$(@)
486
487	# Objects we will link into vmlinux / subdirs we need to visit
488	init-y := init/
489	drivers-y := drivers/ sound/ firmware/
490	net-y := net/
491	libs-y := lib/
492	core-y := usr/
493	endif # KBUILD_EXTMOD
494
495	ifeq ($(dot-config),1)
496	# Read in config
497	-include include/config/auto.conf
498
499	ifeq ($(KBUILD_EXTMOD),)
500	# Read in dependencies to all Kconfig* files, make sure to run
501	# oldconfig if changes are detected.
502	-include include/config/auto.conf.cmd
503
504	# To avoid any implicit rule to kick in, define an empty command
505	$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
506
507	# If .config is newer than include/config/auto.conf, someone tinkered
508	# with it and forgot to run make oldconfig.
509	# if auto.conf.cmd is missing then we are probably in a cleaned tree so
510	# we execute the config step to be sure to catch updated Kconfig files
511	include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
512	$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
513	else
514	# external modules needs include/generated/autoconf.h and include/config/auto.conf
515	# but do not care if they are up-to-date. Use auto.conf to trigger the test
516	PHONY += include/config/auto.conf
517
518	include/config/auto.conf:
519	$(Q)test -e include/generated/autoconf.h -a -e $@ \|\| ( \
520	echo; \
521	echo " ERROR: Kernel configuration is invalid."; \
522	echo " include/generated/autoconf.h or $@ are missing.";\
523	echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
524	echo; \
525	/bin/false)
526
527	endif # KBUILD_EXTMOD
528
529	else
530	# Dummy target needed, because used as prerequisite
531	include/config/auto.conf: ;
532	endif # $(dot-config)
533
534	# The all: target is the default when no target is given on the
535	# command line.
536	# This allow a user to issue only 'make' to build a kernel including modules
537	# Defaults to vmlinux, but the arch makefile usually adds further targets
538	all: vmlinux
539
540	ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
541	KBUILD_CFLAGS += -Os
542	else
543	KBUILD_CFLAGS += -O2
544	endif
545
546	include $(srctree)/arch/$(SRCARCH)/Makefile
547
548	ifneq ($(CONFIG_FRAME_WARN),0)
549	KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
550	endif
551
552	# Force gcc to behave correct even for buggy distributions
553	ifndef CONFIG_CC_STACKPROTECTOR
554	KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
555	endif
556
557	ifdef CONFIG_FRAME_POINTER
558	KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
559	else
560	# Some targets (ARM with Thumb2, for example), can't be built with frame
561	# pointers. For those, we don't have FUNCTION_TRACER automatically
562	# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
563	# incompatible with -fomit-frame-pointer with current GCC, so we don't use
564	# -fomit-frame-pointer with FUNCTION_TRACER.
565	ifndef CONFIG_FUNCTION_TRACER
566	KBUILD_CFLAGS += -fomit-frame-pointer
567	endif
568	endif
569
570	ifdef CONFIG_DEBUG_INFO
571	KBUILD_CFLAGS += -g
572	KBUILD_AFLAGS += -gdwarf-2
573	endif
574
575	ifdef CONFIG_DEBUG_INFO_REDUCED
576	KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly)
577	endif
578
579	ifdef CONFIG_FUNCTION_TRACER
580	KBUILD_CFLAGS += -pg
581	ifdef CONFIG_DYNAMIC_FTRACE
582	ifdef CONFIG_HAVE_C_RECORDMCOUNT
583	BUILD_C_RECORDMCOUNT := y
584	export BUILD_C_RECORDMCOUNT
585	endif
586	endif
587	endif
588
589	# We trigger additional mismatches with less inlining
590	ifdef CONFIG_DEBUG_SECTION_MISMATCH
591	KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
592	endif
593
594	# arch Makefile may override CC so keep this after arch Makefile is included
595	NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
596	CHECKFLAGS += $(NOSTDINC_FLAGS)
597
598	# warn about C99 declaration after statement
599	KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
600
601	# disable pointer signed / unsigned warnings in gcc 4.0
602	KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
603
604	# disable invalid "can't wrap" optimizations for signed / pointers
605	KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
606
607	# conserve stack if available
608	KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
609
610	# check for 'asm goto'
611	ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
612	KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
613	endif
614
615	# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
616	# But warn user when we do so
617	warn-assign = \
618	$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
619
620	ifneq ($(KCPPFLAGS),)
621	$(call warn-assign,CPPFLAGS)
622	KBUILD_CPPFLAGS += $(KCPPFLAGS)
623	endif
624	ifneq ($(KAFLAGS),)
625	$(call warn-assign,AFLAGS)
626	KBUILD_AFLAGS += $(KAFLAGS)
627	endif
628	ifneq ($(KCFLAGS),)
629	$(call warn-assign,CFLAGS)
630	KBUILD_CFLAGS += $(KCFLAGS)
631	endif
632
633	# Use --build-id when available.
634	LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
635	$(call cc-ldoption, -Wl$(comma)--build-id,))
636	KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
637	LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
638
639	ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
640	LDFLAGS_vmlinux += $(call ld-option, -X,)
641	endif
642
643	# Default kernel image to build when no specific target is given.
644	# KBUILD_IMAGE may be overruled on the command line or
645	# set in the environment
646	# Also any assignments in arch/$(ARCH)/Makefile take precedence over
647	# this default value
648	export KBUILD_IMAGE ?= vmlinux
649
650	#
651	# INSTALL_PATH specifies where to place the updated kernel and system map
652	# images. Default is /boot, but you can set it to other values
653	export INSTALL_PATH ?= /boot
654
655	#
656	# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
657	# relocations required by build roots. This is not defined in the
658	# makefile but the argument can be passed to make if needed.
659	#
660
661	MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
662	export MODLIB
663
664	#
665	# INSTALL_MOD_STRIP, if defined, will cause modules to be
666	# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
667	# the default option --strip-debug will be used. Otherwise,
668	# INSTALL_MOD_STRIP will used as the options to the strip command.
669
670	ifdef INSTALL_MOD_STRIP
671	ifeq ($(INSTALL_MOD_STRIP),1)
672	mod_strip_cmd = $(STRIP) --strip-debug
673	else
674	mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
675	endif # INSTALL_MOD_STRIP=1
676	else
677	mod_strip_cmd = true
678	endif # INSTALL_MOD_STRIP
679	export mod_strip_cmd
680
681
682	ifeq ($(KBUILD_EXTMOD),)
683	core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
684
685	vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
686	$(core-y) $(core-m) $(drivers-y) $(drivers-m) \
687	$(net-y) $(net-m) $(libs-y) $(libs-m)))
688
689	vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
690	$(init-n) $(init-) \
691	$(core-n) $(core-) $(drivers-n) $(drivers-) \
692	$(net-n) $(net-) $(libs-n) $(libs-))))
693
694	init-y := $(patsubst %/, %/built-in.o, $(init-y))
695	core-y := $(patsubst %/, %/built-in.o, $(core-y))
696	drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
697	net-y := $(patsubst %/, %/built-in.o, $(net-y))
698	libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
699	libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
700	libs-y := $(libs-y1) $(libs-y2)
701
702	# Build vmlinux
703	# ---------------------------------------------------------------------------
704	# vmlinux is built from the objects selected by $(vmlinux-init) and
705	# $(vmlinux-main). Most are built-in.o files from top-level directories
706	# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
707	# Ordering when linking is important, and $(vmlinux-init) must be first.
708	#
709	# vmlinux
710	# ^
711	# \|
712	# +-< $(vmlinux-init)
713	# \| +--< init/version.o + more
714	# \|
715	# +--< $(vmlinux-main)
716	# \| +--< driver/built-in.o mm/built-in.o + more
717	# \|
718	# +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
719	#
720	# vmlinux version (uname -v) cannot be updated during normal
721	# descending-into-subdirs phase since we do not yet know if we need to
722	# update vmlinux.
723	# Therefore this step is delayed until just before final link of vmlinux -
724	# except in the kallsyms case where it is done just before adding the
725	# symbols to the kernel.
726	#
727	# System.map is generated to document addresses of all kernel symbols
728
729	vmlinux-init := $(head-y) $(init-y)
730	vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
731	vmlinux-all := $(vmlinux-init) $(vmlinux-main)
732	vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
733	export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
734
735	# Rule to link vmlinux - also used during CONFIG_KALLSYMS
736	# May be overridden by arch/$(ARCH)/Makefile
737	quiet_cmd_vmlinux__ ?= LD $@
738	cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
739	-T $(vmlinux-lds) $(vmlinux-init) \
740	--start-group $(vmlinux-main) --end-group \
741	$(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
742
743	# Generate new vmlinux version
744	quiet_cmd_vmlinux_version = GEN .version
745	cmd_vmlinux_version = set -e; \
746	if [ ! -r .version ]; then \
747	rm -f .version; \
748	echo 1 >.version; \
749	else \
750	mv .version .old_version; \
751	expr 0$$(cat .old_version) + 1 >.version; \
752	fi; \
753	$(MAKE) $(build)=init
754
755	# Generate System.map
756	quiet_cmd_sysmap = SYSMAP
757	cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
758
759	# Link of vmlinux
760	# If CONFIG_KALLSYMS is set .version is already updated
761	# Generate System.map and verify that the content is consistent
762	# Use + in front of the vmlinux_version rule to silent warning with make -j2
763	# First command is ':' to allow us to use + in front of the rule
764	define rule_vmlinux__
765	:
766	$(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
767
768	$(call cmd,vmlinux__)
769	$(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
770
771	$(Q)$(if $($(quiet)cmd_sysmap), \
772	echo ' $($(quiet)cmd_sysmap) System.map' &&) \
773	$(cmd_sysmap) $@ System.map; \
774	if [ $$? -ne 0 ]; then \
775	rm -f $@; \
776	/bin/false; \
777	fi;
778	$(verify_kallsyms)
779	endef
780
781
782	ifdef CONFIG_KALLSYMS
783	# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
784	# It's a three stage process:
785	# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
786	# empty
787	# Running kallsyms on that gives us .tmp_kallsyms1.o with
788	# the right size - vmlinux version (uname -v) is updated during this step
789	# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
790	# but due to the added section, some addresses have shifted.
791	# From here, we generate a correct .tmp_kallsyms2.o
792	# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
793	# o Verify that the System.map from vmlinux matches the map from
794	# .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
795	# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
796	# .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
797	# temporary bypass to allow the kernel to be built while the
798	# maintainers work out what went wrong with kallsyms.
799
800	ifdef CONFIG_KALLSYMS_EXTRA_PASS
801	last_kallsyms := 3
802	else
803	last_kallsyms := 2
804	endif
805
806	kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
807
808	define verify_kallsyms
809	$(Q)$(if $($(quiet)cmd_sysmap), \
810	echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
811	$(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
812	$(Q)cmp -s System.map .tmp_System.map \|\| \
813	(echo Inconsistent kallsyms data; \
814	echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
815	rm .tmp_kallsyms* ; /bin/false )
816	endef
817
818	# Update vmlinux version before link
819	# Use + in front of this rule to silent warning about make -j1
820	# First command is ':' to allow us to use + in front of this rule
821	cmd_ksym_ld = $(cmd_vmlinux__)
822	define rule_ksym_ld
823	:
824	+$(call cmd,vmlinux_version)
825	$(call cmd,vmlinux__)
826	$(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
827	endef
828
829	# Generate .S file with all kernel symbols
830	quiet_cmd_kallsyms = KSYM $@
831	cmd_kallsyms = $(NM) -n $< \| $(KALLSYMS) \
832	$(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
833
834	.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
835	$(call if_changed_dep,as_o_S)
836
837	.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
838	$(call cmd,kallsyms)
839
840	# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
841	.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
842	$(call if_changed_rule,ksym_ld)
843
844	.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
845	$(call if_changed,vmlinux__)
846
847	.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
848	$(call if_changed,vmlinux__)
849
850	# Needs to visit scripts/ before $(KALLSYMS) can be used.
851	$(KALLSYMS): scripts ;
852
853	# Generate some data for debugging strange kallsyms problems
854	debug_kallsyms: .tmp_map$(last_kallsyms)
855
856	.tmp_map%: .tmp_vmlinux% FORCE
857	($(OBJDUMP) -h $< \| $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) \| sort > $@
858
859	.tmp_map3: .tmp_map2
860
861	.tmp_map2: .tmp_map1
862
863	endif # ifdef CONFIG_KALLSYMS
864
865	# Do modpost on a prelinked vmlinux. The finally linked vmlinux has
866	# relevant sections renamed as per the linker script.
867	quiet_cmd_vmlinux-modpost = LD $@
868	cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
869	$(vmlinux-init) --start-group $(vmlinux-main) --end-group \
870	$(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
871	define rule_vmlinux-modpost
872	:
873	+$(call cmd,vmlinux-modpost)
874	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
875	$(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
876	endef
877
878	# vmlinux image - including updated kernel symbols
879	vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
880	ifdef CONFIG_HEADERS_CHECK
881	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
882	endif
883	ifdef CONFIG_SAMPLES
884	$(Q)$(MAKE) $(build)=samples
885	endif
886	ifdef CONFIG_BUILD_DOCSRC
887	$(Q)$(MAKE) $(build)=Documentation
888	endif
889	$(call vmlinux-modpost)
890	$(call if_changed_rule,vmlinux__)
891	$(Q)rm -f .old_version
892
893	# build vmlinux.o first to catch section mismatch errors early
894	ifdef CONFIG_KALLSYMS
895	.tmp_vmlinux1: vmlinux.o
896	endif
897
898	modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
899	vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
900	$(call if_changed_rule,vmlinux-modpost)
901
902	# The actual objects are generated when descending,
903	# make sure no implicit rule kicks in
904	$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
905
906	# Handle descending into subdirectories listed in $(vmlinux-dirs)
907	# Preset locale variables to speed up the build process. Limit locale
908	# tweaks to this spot to avoid wrong language settings when running
909	# make menuconfig etc.
910	# Error messages still appears in the original language
911
912	PHONY += $(vmlinux-dirs)
913	$(vmlinux-dirs): prepare scripts
914	$(Q)$(MAKE) $(build)=$@
915
916	# Store (new) KERNELRELASE string in include/config/kernel.release
917	include/config/kernel.release: include/config/auto.conf FORCE
918	$(Q)rm -f $@
919	$(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
920
921
922	# Things we need to do before we recursively start building the kernel
923	# or the modules are listed in "prepare".
924	# A multi level approach is used. prepareN is processed before prepareN-1.
925	# archprepare is used in arch Makefiles and when processed asm symlink,
926	# version.h and scripts_basic is processed / created.
927
928	# Listed in dependency order
929	PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
930
931	# prepare3 is used to check if we are building in a separate output directory,
932	# and if so do:
933	# 1) Check that make has not been executed in the kernel src $(srctree)
934	prepare3: include/config/kernel.release
935	ifneq ($(KBUILD_SRC),)
936	@$(kecho) ' Using $(srctree) as source for kernel'
937	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
938	echo " $(srctree) is not clean, please run 'make mrproper'";\
939	echo " in the '$(srctree)' directory.";\
940	/bin/false; \
941	fi;
942	endif
943
944	# prepare2 creates a makefile if using a separate output directory
945	prepare2: prepare3 outputmakefile
946
947	prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
948	include/config/auto.conf
949	$(cmd_crmodverdir)
950
951	archprepare: prepare1 scripts_basic
952
953	prepare0: archprepare FORCE
954	$(Q)$(MAKE) $(build)=.
955	$(Q)$(MAKE) $(build)=. missing-syscalls
956
957	# All the preparing..
958	prepare: prepare0
959
960	# Generate some files
961	# ---------------------------------------------------------------------------
962
963	# KERNELRELEASE can change from a few different places, meaning version.h
964	# needs to be updated, so this check is forced on all builds
965
966	uts_len := 64
967	define filechk_utsrelease.h
968	if [ `echo -n "$(KERNELRELEASE)" \| wc -c ` -gt $(uts_len) ]; then \
969	echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
970	exit 1; \
971	fi; \
972	(echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
973	endef
974
975	define filechk_version.h
976	(echo \#define LINUX_VERSION_CODE $(shell \
977	expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
978	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
979	endef
980
981	include/linux/version.h: $(srctree)/Makefile FORCE
982	$(call filechk,version.h)
983
984	include/generated/utsrelease.h: include/config/kernel.release FORCE
985	$(call filechk,utsrelease.h)
986
987	PHONY += headerdep
988	headerdep:
989	$(Q)find include/ -name '*.h' \| xargs --max-args 1 scripts/headerdep.pl
990
991	# ---------------------------------------------------------------------------
992
993	PHONY += depend dep
994	depend dep:
995	@echo '*** Warning: make $@ is unnecessary now.'
996
997	# ---------------------------------------------------------------------------
998	# Firmware install
999	INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1000	export INSTALL_FW_PATH
1001
1002	PHONY += firmware_install
1003	firmware_install: FORCE
1004	@mkdir -p $(objtree)/firmware
1005	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1006
1007	# ---------------------------------------------------------------------------
1008	# Kernel headers
1009
1010	#Default location for installed headers
1011	export INSTALL_HDR_PATH = $(objtree)/usr
1012
1013	hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1014
1015	# If we do an all arch process set dst to asm-$(hdr-arch)
1016	hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1017
1018	PHONY += __headers
1019	__headers: include/linux/version.h scripts_basic FORCE
1020	$(Q)$(MAKE) $(build)=scripts scripts/unifdef
1021
1022	PHONY += headers_install_all
1023	headers_install_all:
1024	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1025
1026	PHONY += headers_install
1027	headers_install: __headers
1028	$(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1029	$(error Headers not exportable for the $(SRCARCH) architecture))
1030	$(Q)$(MAKE) $(hdr-inst)=include
1031	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1032
1033	PHONY += headers_check_all
1034	headers_check_all: headers_install_all
1035	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1036
1037	PHONY += headers_check
1038	headers_check: headers_install
1039	$(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1040	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1041
1042	# ---------------------------------------------------------------------------
1043	# Modules
1044
1045	ifdef CONFIG_MODULES
1046
1047	# By default, build modules as well
1048
1049	all: modules
1050
1051	# Build modules
1052	#
1053	# A module can be listed more than once in obj-m resulting in
1054	# duplicate lines in modules.order files. Those are removed
1055	# using awk while concatenating to the final file.
1056
1057	PHONY += modules
1058	modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1059	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1060	@$(kecho) ' Building modules, stage 2.';
1061	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1062	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1063
1064	modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1065	$(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1066
1067	%/modules.builtin: include/config/auto.conf
1068	$(Q)$(MAKE) $(modbuiltin)=$*
1069
1070
1071	# Target to prepare building external modules
1072	PHONY += modules_prepare
1073	modules_prepare: prepare scripts
1074
1075	# Target to install modules
1076	PHONY += modules_install
1077	modules_install: _modinst_ _modinst_post
1078
1079	PHONY += _modinst_
1080	_modinst_:
1081	@if [ -z "`$(DEPMOD) -V 2>/dev/null \| grep module-init-tools`" ]; then \
1082	echo "Warning: you may need to install module-init-tools"; \
1083	echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1084	sleep 1; \
1085	fi
1086	@rm -rf $(MODLIB)/kernel
1087	@rm -f $(MODLIB)/source
1088	@mkdir -p $(MODLIB)/kernel
1089	@ln -s $(srctree) $(MODLIB)/source
1090	@if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1091	rm -f $(MODLIB)/build ; \
1092	ln -s $(objtree) $(MODLIB)/build ; \
1093	fi
1094	@cp -f $(objtree)/modules.order $(MODLIB)/
1095	@cp -f $(objtree)/modules.builtin $(MODLIB)/
1096	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1097
1098	# This depmod is only for convenience to give the initial
1099	# boot a modules.dep even before / is mounted read-write. However the
1100	# boot script depmod is the master version.
1101	PHONY += _modinst_post
1102	_modinst_post: _modinst_
1103	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1104	$(call cmd,depmod)
1105
1106	else # CONFIG_MODULES
1107
1108	# Modules not configured
1109	# ---------------------------------------------------------------------------
1110
1111	modules modules_install: FORCE
1112	@echo
1113	@echo "The present kernel configuration has modules disabled."
1114	@echo "Type 'make config' and enable loadable module support."
1115	@echo "Then build a kernel with module support enabled."
1116	@echo
1117	@exit 1
1118
1119	endif # CONFIG_MODULES
1120
1121	###
1122	# Cleaning is done on three levels.
1123	# make clean Delete most generated files
1124	# Leave enough to build external modules
1125	# make mrproper Delete the current configuration, and all generated files
1126	# make distclean Remove editor backup files, patch leftover files and the like
1127
1128	# Directories & files removed with 'make clean'
1129	CLEAN_DIRS += $(MODVERDIR)
1130	CLEAN_FILES += vmlinux System.map \
1131	.tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1132
1133	# Directories & files removed with 'make mrproper'
1134	MRPROPER_DIRS += include/config usr/include include/generated
1135	MRPROPER_FILES += .config .config.old .version .old_version \
1136	include/linux/version.h \
1137	Module.symvers tags TAGS cscope*
1138
1139	# clean - Delete most, but leave enough to build external modules
1140	#
1141	clean: rm-dirs := $(CLEAN_DIRS)
1142	clean: rm-files := $(CLEAN_FILES)
1143	clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation)
1144
1145	PHONY += $(clean-dirs) clean archclean
1146	$(clean-dirs):
1147	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1148
1149	clean: archclean
1150
1151	# mrproper - Delete all generated files, including .config
1152	#
1153	mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1154	mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1155	mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1156
1157	PHONY += $(mrproper-dirs) mrproper archmrproper
1158	$(mrproper-dirs):
1159	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1160
1161	mrproper: clean archmrproper $(mrproper-dirs)
1162	$(call cmd,rmdirs)
1163	$(call cmd,rmfiles)
1164
1165	# distclean
1166	#
1167	PHONY += distclean
1168
1169	distclean: mrproper
1170	@find $(srctree) $(RCS_FIND_IGNORE) \
1171	\( -name '.orig' -o -name '.rej' -o -name '*~' \
1172	-o -name '.bak' -o -name '##' -o -name '.*.orig' \
1173	-o -name '.*.rej' -o -size 0 \
1174	-o -name '%' -o -name '..cmd' -o -name 'core' \) \
1175	-type f -print \| xargs rm -f
1176
1177
1178	# Packaging of the kernel to various formats
1179	# ---------------------------------------------------------------------------
1180	# rpm target kept for backward compatibility
1181	package-dir := $(srctree)/scripts/package
1182
1183	%src-pkg: FORCE
1184	$(Q)$(MAKE) $(build)=$(package-dir) $@
1185	%pkg: include/config/kernel.release FORCE
1186	$(Q)$(MAKE) $(build)=$(package-dir) $@
1187	rpm: include/config/kernel.release FORCE
1188	$(Q)$(MAKE) $(build)=$(package-dir) $@
1189
1190
1191	# Brief documentation of the typical targets used
1192	# ---------------------------------------------------------------------------
1193
1194	boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1195	boards := $(notdir $(boards))
1196	board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs//_defconfig))
1197	board-dirs := $(sort $(notdir $(board-dirs:/=)))
1198
1199	help:
1200	@echo 'Cleaning targets:'
1201	@echo ' clean - Remove most generated files but keep the config and'
1202	@echo ' enough build support to build external modules'
1203	@echo ' mrproper - Remove all generated files + config + various backup files'
1204	@echo ' distclean - mrproper + remove editor backup and patch files'
1205	@echo ''
1206	@echo 'Configuration targets:'
1207	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1208	@echo ''
1209	@echo 'Other generic targets:'
1210	@echo ' all - Build all targets marked with [*]'
1211	@echo '* vmlinux - Build the bare kernel'
1212	@echo '* modules - Build all modules'
1213	@echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1214	@echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1215	@echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1216	@echo ' dir/ - Build all files in dir and below'
1217	@echo ' dir/file.[oisS] - Build specified target only'
1218	@echo ' dir/file.lst - Build specified mixed source/assembly target only'
1219	@echo ' (requires a recent binutils and recent build (System.map))'
1220	@echo ' dir/file.ko - Build module including final link'
1221	@echo ' modules_prepare - Set up for building external modules'
1222	@echo ' tags/TAGS - Generate tags file for editors'
1223	@echo ' cscope - Generate cscope index'
1224	@echo ' kernelrelease - Output the release version string'
1225	@echo ' kernelversion - Output the version stored in Makefile'
1226	@echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1227	echo ' (default: $(INSTALL_HDR_PATH))'; \
1228	echo ''
1229	@echo 'Static analysers'
1230	@echo ' checkstack - Generate a list of stack hogs'
1231	@echo ' namespacecheck - Name space analysis on compiled kernel'
1232	@echo ' versioncheck - Sanity check on version.h usage'
1233	@echo ' includecheck - Check for duplicate included header files'
1234	@echo ' export_report - List the usages of all exported symbols'
1235	@echo ' headers_check - Sanity check on exported headers'
1236	@echo ' headerdep - Detect inclusion cycles in headers'
1237	@$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1238	@echo ''
1239	@echo 'Kernel packaging:'
1240	@$(MAKE) $(build)=$(package-dir) help
1241	@echo ''
1242	@echo 'Documentation targets:'
1243	@$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1244	@echo ''
1245	@echo 'Architecture specific targets ($(SRCARCH)):'
1246	@$(if $(archhelp),$(archhelp),\
1247	echo ' No architecture specific help defined for $(SRCARCH)')
1248	@echo ''
1249	@$(if $(boards), \
1250	$(foreach b, $(boards), \
1251	printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1252	echo '')
1253	@$(if $(board-dirs), \
1254	$(foreach b, $(board-dirs), \
1255	printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1256	printf " %-16s - Show all of the above\\n" help-boards; \
1257	echo '')
1258
1259	@echo ' make V=0\|1 [targets] 0 => quiet build (default), 1 => verbose build'
1260	@echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1261	@echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1262	@echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1263	@echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1264	@echo ''
1265	@echo 'Execute "make" or "make all" to build all targets marked with [*] '
1266	@echo 'For further info see the ./README file'
1267
1268
1269	help-board-dirs := $(addprefix help-,$(board-dirs))
1270
1271	help-boards: $(help-board-dirs)
1272
1273	boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$/_defconfig))
1274
1275	$(help-board-dirs): help-%:
1276	@echo 'Architecture specific targets ($(SRCARCH) $*):'
1277	@$(if $(boards-per-dir), \
1278	$(foreach b, $(boards-per-dir), \
1279	printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1280	echo '')
1281
1282
1283	# Documentation targets
1284	# ---------------------------------------------------------------------------
1285	%docs: scripts_basic FORCE
1286	$(Q)$(MAKE) $(build)=Documentation/DocBook $@
1287
1288	else # KBUILD_EXTMOD
1289
1290	###
1291	# External module support.
1292	# When building external modules the kernel used as basis is considered
1293	# read-only, and no consistency checks are made and the make
1294	# system is not used on the basis kernel. If updates are required
1295	# in the basis kernel ordinary make commands (without M=...) must
1296	# be used.
1297	#
1298	# The following are the only valid targets when building external
1299	# modules.
1300	# make M=dir clean Delete all automatically generated files
1301	# make M=dir modules Make all modules in specified dir
1302	# make M=dir Same as 'make M=dir modules'
1303	# make M=dir modules_install
1304	# Install the modules built in the module directory
1305	# Assumes install directory is already created
1306
1307	# We are always building modules
1308	KBUILD_MODULES := 1
1309	PHONY += crmodverdir
1310	crmodverdir:
1311	$(cmd_crmodverdir)
1312
1313	PHONY += $(objtree)/Module.symvers
1314	$(objtree)/Module.symvers:
1315	@test -e $(objtree)/Module.symvers \|\| ( \
1316	echo; \
1317	echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1318	echo " is missing; modules will have no dependencies and modversions."; \
1319	echo )
1320
1321	module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1322	PHONY += $(module-dirs) modules
1323	$(module-dirs): crmodverdir $(objtree)/Module.symvers
1324	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1325
1326	modules: $(module-dirs)
1327	@$(kecho) ' Building modules, stage 2.';
1328	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1329
1330	PHONY += modules_install
1331	modules_install: _emodinst_ _emodinst_post
1332
1333	install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1334	PHONY += _emodinst_
1335	_emodinst_:
1336	$(Q)mkdir -p $(MODLIB)/$(install-dir)
1337	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1338
1339	PHONY += _emodinst_post
1340	_emodinst_post: _emodinst_
1341	$(call cmd,depmod)
1342
1343	clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1344
1345	PHONY += $(clean-dirs) clean
1346	$(clean-dirs):
1347	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1348
1349	clean: rm-dirs := $(MODVERDIR)
1350	clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1351
1352	help:
1353	@echo ' Building external modules.'
1354	@echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1355	@echo ''
1356	@echo ' modules - default target, build the module(s)'
1357	@echo ' modules_install - install the module'
1358	@echo ' clean - remove generated files in module directory only'
1359	@echo ''
1360
1361	# Dummies...
1362	PHONY += prepare scripts
1363	prepare: ;
1364	scripts: ;
1365	endif # KBUILD_EXTMOD
1366
1367	clean: $(clean-dirs)
1368	$(call cmd,rmdirs)
1369	$(call cmd,rmfiles)
1370	@find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1371	\( -name '.[oas]' -o -name '.ko' -o -name '.*.cmd' \
1372	-o -name '..d' -o -name '..tmp' -o -name '*.mod.c' \
1373	-o -name '*.symtypes' -o -name 'modules.order' \
1374	-o -name modules.builtin -o -name '.tmp_.o.' \
1375	-o -name '*.gcno' \) -type f -print \| xargs rm -f
1376
1377	# Generate tags for editors
1378	# ---------------------------------------------------------------------------
1379	quiet_cmd_tags = GEN $@
1380	cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1381
1382	tags TAGS cscope: FORCE
1383	$(call cmd,tags)
1384
1385	# Scripts to check various things for consistency
1386	# ---------------------------------------------------------------------------
1387
1388	includecheck:
1389	find * $(RCS_FIND_IGNORE) \
1390	-name '*.[hcS]' -type f -print \| sort \
1391	\| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1392
1393	versioncheck:
1394	find * $(RCS_FIND_IGNORE) \
1395	-name '*.[hcS]' -type f -print \| sort \
1396	\| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1397
1398	coccicheck:
1399	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1400
1401	namespacecheck:
1402	$(PERL) $(srctree)/scripts/namespace.pl
1403
1404	export_report:
1405	$(PERL) $(srctree)/scripts/export_report.pl
1406
1407	endif #ifeq ($(config-targets),1)
1408	endif #ifeq ($(mixed-targets),1)
1409
1410	PHONY += checkstack kernelrelease kernelversion
1411
1412	# UML needs a little special treatment here. It wants to use the host
1413	# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1414	# else wants $(ARCH), including people doing cross-builds, which means
1415	# that $(SUBARCH) doesn't work here.
1416	ifeq ($(ARCH), um)
1417	CHECKSTACK_ARCH := $(SUBARCH)
1418	else
1419	CHECKSTACK_ARCH := $(ARCH)
1420	endif
1421	checkstack:
1422	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') \| \
1423	$(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1424
1425	kernelrelease:
1426	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1427
1428	kernelversion:
1429	@echo $(KERNELVERSION)
1430
1431	# Single targets
1432	# ---------------------------------------------------------------------------
1433	# Single targets are compatible with:
1434	# - build with mixed source and output
1435	# - build with separate output dir 'make O=...'
1436	# - external modules
1437	#
1438	# target-dir => where to store outputfile
1439	# build-dir => directory in kernel source tree to use
1440
1441	ifeq ($(KBUILD_EXTMOD),)
1442	build-dir = $(patsubst %/,%,$(dir $@))
1443	target-dir = $(dir $@)
1444	else
1445	zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1446	build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1447	target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1448	endif
1449
1450	%.s: %.c prepare scripts FORCE
1451	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1452	%.i: %.c prepare scripts FORCE
1453	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1454	%.o: %.c prepare scripts FORCE
1455	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1456	%.lst: %.c prepare scripts FORCE
1457	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1458	%.s: %.S prepare scripts FORCE
1459	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1460	%.o: %.S prepare scripts FORCE
1461	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1462	%.symtypes: %.c prepare scripts FORCE
1463	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1464
1465	# Modules
1466	/: prepare scripts FORCE
1467	$(cmd_crmodverdir)
1468	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1469	$(build)=$(build-dir)
1470	%/: prepare scripts FORCE
1471	$(cmd_crmodverdir)
1472	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1473	$(build)=$(build-dir)
1474	%.ko: prepare scripts FORCE
1475	$(cmd_crmodverdir)
1476	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1477	$(build)=$(build-dir) $(@:.ko=.o)
1478	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1479
1480	# FIXME Should go into a make.lib or something
1481	# ===========================================================================
1482
1483	quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1484	cmd_rmdirs = rm -rf $(rm-dirs)
1485
1486	quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1487	cmd_rmfiles = rm -f $(rm-files)
1488
1489	# Run depmod only if we have System.map and depmod is executable
1490	quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1491	cmd_depmod = \
1492	if [ -r System.map -a -x $(DEPMOD) ]; then \
1493	$(DEPMOD) -ae -F System.map \
1494	$(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) ) \
1495	$(KERNELRELEASE); \
1496	fi
1497
1498	# Create temporary dir for module support files
1499	# clean it up only when building all modules
1500	cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1501	$(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1502
1503	a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1504	$(KBUILD_AFLAGS_KERNEL) \
1505	$(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1506	$(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1507
1508	quiet_cmd_as_o_S = AS $@
1509	cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1510
1511	# read all saved command lines
1512
1513	targets := $(wildcard $(sort $(targets)))
1514	cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1515
1516	ifneq ($(cmd_files),)
1517	$(cmd_files): ; # Do not try to update included dependency files
1518	include $(cmd_files)
1519	endif
1520
1521	# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1522	# Usage:
1523	# $(Q)$(MAKE) $(clean)=dir
1524	clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1525
1526	endif # skip-makefile
1527
1528	PHONY += FORCE
1529	FORCE:
1530
1531	# Declare the contents of the .PHONY variable as phony. We keep that
1532	# information in a variable so we can use it in if_changed and friends.
1533	.PHONY: $(PHONY)
1534

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