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1	VERSION = 3
2	PATCHLEVEL = 6
3	SUBLEVEL = 0
4	EXTRAVERSION =
5	NAME = Terrified Chipmunk
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 := $(O)
103	endif
104
105	ifeq ("$(origin W)", "command line")
106	export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
107	endif
108
109	# That's our default target when none is given on the command line
110	PHONY := _all
111	_all:
112
113	# Cancel implicit rules on top Makefile
114	$(CURDIR)/Makefile Makefile: ;
115
116	ifneq ($(KBUILD_OUTPUT),)
117	# Invoke a second make in the output directory, passing relevant variables
118	# check that the output directory actually exists
119	saved-output := $(KBUILD_OUTPUT)
120	KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
121	$(if $(KBUILD_OUTPUT),, \
122	$(error output directory "$(saved-output)" does not exist))
123
124	PHONY += $(MAKECMDGOALS) sub-make
125
126	$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
127	$(Q)@:
128
129	sub-make: FORCE
130	$(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
131	KBUILD_SRC=$(CURDIR) \
132	KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
133	$(filter-out _all sub-make,$(MAKECMDGOALS))
134
135	# Leave processing to above invocation of make
136	skip-makefile := 1
137	endif # ifneq ($(KBUILD_OUTPUT),)
138	endif # ifeq ($(KBUILD_SRC),)
139
140	# We process the rest of the Makefile if this is the final invocation of make
141	ifeq ($(skip-makefile),)
142
143	# If building an external module we do not care about the all: rule
144	# but instead _all depend on modules
145	PHONY += all
146	ifeq ($(KBUILD_EXTMOD),)
147	_all: all
148	else
149	_all: modules
150	endif
151
152	srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
153	objtree := $(CURDIR)
154	src := $(srctree)
155	obj := $(objtree)
156
157	VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
158
159	export srctree objtree VPATH
160
161
162	# SUBARCH tells the usermode build what the underlying arch is. That is set
163	# first, and if a usermode build is happening, the "ARCH=um" on the command
164	# line overrides the setting of ARCH below. If a native build is happening,
165	# then ARCH is assigned, getting whatever value it gets normally, and
166	# SUBARCH is subsequently ignored.
167
168	SUBARCH := $(shell uname -m \| sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
169	-e s/arm.*/arm/ -e s/sa110/arm/ \
170	-e s/s390x/s390/ -e s/parisc64/parisc/ \
171	-e s/ppc./powerpc/ -e s/mips./mips/ \
172	-e s/sh[234].*/sh/ )
173
174	# Cross compiling and selecting different set of gcc/bin-utils
175	# ---------------------------------------------------------------------------
176	#
177	# When performing cross compilation for other architectures ARCH shall be set
178	# to the target architecture. (See arch/* for the possibilities).
179	# ARCH can be set during invocation of make:
180	# make ARCH=ia64
181	# Another way is to have ARCH set in the environment.
182	# The default ARCH is the host where make is executed.
183
184	# CROSS_COMPILE specify the prefix used for all executables used
185	# during compilation. Only gcc and related bin-utils executables
186	# are prefixed with $(CROSS_COMPILE).
187	# CROSS_COMPILE can be set on the command line
188	# make CROSS_COMPILE=ia64-linux-
189	# Alternatively CROSS_COMPILE can be set in the environment.
190	# A third alternative is to store a setting in .config so that plain
191	# "make" in the configured kernel build directory always uses that.
192	# Default value for CROSS_COMPILE is not to prefix executables
193	# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
194	export KBUILD_BUILDHOST := $(SUBARCH)
195	ARCH ?= $(SUBARCH)
196	CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
197
198	# Architecture as present in compile.h
199	UTS_MACHINE := $(ARCH)
200	SRCARCH := $(ARCH)
201
202	# Additional ARCH settings for x86
203	ifeq ($(ARCH),i386)
204	SRCARCH := x86
205	endif
206	ifeq ($(ARCH),x86_64)
207	SRCARCH := x86
208	endif
209
210	# Additional ARCH settings for sparc
211	ifeq ($(ARCH),sparc32)
212	SRCARCH := sparc
213	endif
214	ifeq ($(ARCH),sparc64)
215	SRCARCH := sparc
216	endif
217
218	# Additional ARCH settings for sh
219	ifeq ($(ARCH),sh64)
220	SRCARCH := sh
221	endif
222
223	# Additional ARCH settings for tile
224	ifeq ($(ARCH),tilepro)
225	SRCARCH := tile
226	endif
227	ifeq ($(ARCH),tilegx)
228	SRCARCH := tile
229	endif
230
231	# Where to locate arch specific headers
232	hdr-arch := $(SRCARCH)
233
234	KCONFIG_CONFIG ?= .config
235	export KCONFIG_CONFIG
236
237	# SHELL used by kbuild
238	CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
239	else if [ -x /bin/bash ]; then echo /bin/bash; \
240	else echo sh; fi ; fi)
241
242	HOSTCC = gcc
243	HOSTCXX = g++
244	HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
245	HOSTCXXFLAGS = -O2
246
247	# Decide whether to build built-in, modular, or both.
248	# Normally, just do built-in.
249
250	KBUILD_MODULES :=
251	KBUILD_BUILTIN := 1
252
253	# If we have only "make modules", don't compile built-in objects.
254	# When we're building modules with modversions, we need to consider
255	# the built-in objects during the descend as well, in order to
256	# make sure the checksums are up to date before we record them.
257
258	ifeq ($(MAKECMDGOALS),modules)
259	KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
260	endif
261
262	# If we have "make <whatever> modules", compile modules
263	# in addition to whatever we do anyway.
264	# Just "make" or "make all" shall build modules as well
265
266	ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
267	KBUILD_MODULES := 1
268	endif
269
270	ifeq ($(MAKECMDGOALS),)
271	KBUILD_MODULES := 1
272	endif
273
274	export KBUILD_MODULES KBUILD_BUILTIN
275	export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
276
277	# Beautify output
278	# ---------------------------------------------------------------------------
279	#
280	# Normally, we echo the whole command before executing it. By making
281	# that echo $($(quiet)$(cmd)), we now have the possibility to set
282	# $(quiet) to choose other forms of output instead, e.g.
283	#
284	# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
285	# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
286	#
287	# If $(quiet) is empty, the whole command will be printed.
288	# If it is set to "quiet_", only the short version will be printed.
289	# If it is set to "silent_", nothing will be printed at all, since
290	# the variable $(silent_cmd_cc_o_c) doesn't exist.
291	#
292	# A simple variant is to prefix commands with $(Q) - that's useful
293	# for commands that shall be hidden in non-verbose mode.
294	#
295	# $(Q)ln $@ :<
296	#
297	# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
298	# If KBUILD_VERBOSE equals 1 then the above command is displayed.
299
300	ifeq ($(KBUILD_VERBOSE),1)
301	quiet =
302	Q =
303	else
304	quiet=quiet_
305	Q = @
306	endif
307
308	# If the user is running make -s (silent mode), suppress echoing of
309	# commands
310
311	ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
312	quiet=silent_
313	endif
314
315	export quiet Q KBUILD_VERBOSE
316
317
318	# Look for make include files relative to root of kernel src
319	MAKEFLAGS += --include-dir=$(srctree)
320
321	# We need some generic definitions (do not try to remake the file).
322	$(srctree)/scripts/Kbuild.include: ;
323	include $(srctree)/scripts/Kbuild.include
324
325	# Make variables (CC, etc...)
326
327	AS = $(CROSS_COMPILE)as
328	LD = $(CROSS_COMPILE)ld
329	CC = $(CROSS_COMPILE)gcc
330	CPP = $(CC) -E
331	AR = $(CROSS_COMPILE)ar
332	NM = $(CROSS_COMPILE)nm
333	STRIP = $(CROSS_COMPILE)strip
334	OBJCOPY = $(CROSS_COMPILE)objcopy
335	OBJDUMP = $(CROSS_COMPILE)objdump
336	AWK = awk
337	GENKSYMS = scripts/genksyms/genksyms
338	INSTALLKERNEL := installkernel
339	DEPMOD = /sbin/depmod
340	PERL = perl
341	CHECK = sparse
342
343	CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
344	-Wbitwise -Wno-return-void $(CF)
345	CFLAGS_MODULE =
346	AFLAGS_MODULE =
347	LDFLAGS_MODULE =
348	CFLAGS_KERNEL =
349	AFLAGS_KERNEL =
350	CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
351
352
353	# Use LINUXINCLUDE when you must reference the include/ directory.
354	# Needed to be compatible with the O= option
355	LINUXINCLUDE := -I$(srctree)/arch/$(hdr-arch)/include \
356	-Iarch/$(hdr-arch)/include/generated -Iinclude \
357	$(if $(KBUILD_SRC), -I$(srctree)/include) \
358	-include $(srctree)/include/linux/kconfig.h
359
360	KBUILD_CPPFLAGS := -D__KERNEL__
361
362	KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
363	-fno-strict-aliasing -fno-common \
364	-Werror-implicit-function-declaration \
365	-Wno-format-security \
366	-fno-delete-null-pointer-checks
367	KBUILD_AFLAGS_KERNEL :=
368	KBUILD_CFLAGS_KERNEL :=
369	KBUILD_AFLAGS := -D__ASSEMBLY__
370	KBUILD_AFLAGS_MODULE := -DMODULE
371	KBUILD_CFLAGS_MODULE := -DMODULE
372	KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
373
374	# Read KERNELRELEASE from include/config/kernel.release (if it exists)
375	KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
376	KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
377
378	export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
379	export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
380	export CPP AR NM STRIP OBJCOPY OBJDUMP
381	export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
382	export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
383
384	export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
385	export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
386	export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
387	export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
388	export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
389	export KBUILD_ARFLAGS
390
391	# When compiling out-of-tree modules, put MODVERDIR in the module
392	# tree rather than in the kernel tree. The kernel tree might
393	# even be read-only.
394	export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
395
396	# Files to ignore in find ... statements
397
398	RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \
399	-o -name .pc -o -name .hg -o -name .git \) -prune -o
400	export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
401	--exclude CVS --exclude .pc --exclude .hg --exclude .git
402
403	# ===========================================================================
404	# Rules shared between *config targets and build targets
405
406	# Basic helpers built in scripts/
407	PHONY += scripts_basic
408	scripts_basic:
409	$(Q)$(MAKE) $(build)=scripts/basic
410	$(Q)rm -f .tmp_quiet_recordmcount
411
412	# To avoid any implicit rule to kick in, define an empty command.
413	scripts/basic/%: scripts_basic ;
414
415	PHONY += outputmakefile
416	# outputmakefile generates a Makefile in the output directory, if using a
417	# separate output directory. This allows convenient use of make in the
418	# output directory.
419	outputmakefile:
420	ifneq ($(KBUILD_SRC),)
421	$(Q)ln -fsn $(srctree) source
422	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
423	$(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
424	endif
425
426	# Support for using generic headers in asm-generic
427	PHONY += asm-generic
428	asm-generic:
429	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
430	obj=arch/$(SRCARCH)/include/generated/asm
431
432	# To make sure we do not include .config for any of the *config targets
433	# catch them early, and hand them over to scripts/kconfig/Makefile
434	# It is allowed to specify more targets when calling make, including
435	# mixing *config targets and build targets.
436	# For example 'make oldconfig all'.
437	# Detect when mixed targets is specified, and make a second invocation
438	# of make so .config is not included in this case either (for *config).
439
440	no-dot-config-targets := clean mrproper distclean \
441	cscope gtags TAGS tags help %docs check% coccicheck \
442	include/linux/version.h headers_% archheaders archscripts \
443	kernelversion %src-pkg
444
445	config-targets := 0
446	mixed-targets := 0
447	dot-config := 1
448
449	ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
450	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
451	dot-config := 0
452	endif
453	endif
454
455	ifeq ($(KBUILD_EXTMOD),)
456	ifneq ($(filter config %config,$(MAKECMDGOALS)),)
457	config-targets := 1
458	ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
459	mixed-targets := 1
460	endif
461	endif
462	endif
463
464	ifeq ($(mixed-targets),1)
465	# ===========================================================================
466	# We're called with mixed targets (*config and build targets).
467	# Handle them one by one.
468
469	%:: FORCE
470	$(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
471
472	else
473	ifeq ($(config-targets),1)
474	# ===========================================================================
475	# *config targets only - make sure prerequisites are updated, and descend
476	# in scripts/kconfig to make the *config target
477
478	# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
479	# KBUILD_DEFCONFIG may point out an alternative default configuration
480	# used for 'make defconfig'
481	include $(srctree)/arch/$(SRCARCH)/Makefile
482	export KBUILD_DEFCONFIG KBUILD_KCONFIG
483
484	config: scripts_basic outputmakefile FORCE
485	$(Q)mkdir -p include/linux include/config
486	$(Q)$(MAKE) $(build)=scripts/kconfig $@
487
488	%config: scripts_basic outputmakefile FORCE
489	$(Q)mkdir -p include/linux include/config
490	$(Q)$(MAKE) $(build)=scripts/kconfig $@
491
492	else
493	# ===========================================================================
494	# Build targets only - this includes vmlinux, arch specific targets, clean
495	# targets and others. In general all targets except *config targets.
496
497	ifeq ($(KBUILD_EXTMOD),)
498	# Additional helpers built in scripts/
499	# Carefully list dependencies so we do not try to build scripts twice
500	# in parallel
501	PHONY += scripts
502	scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
503	$(Q)$(MAKE) $(build)=$(@)
504
505	# Objects we will link into vmlinux / subdirs we need to visit
506	init-y := init/
507	drivers-y := drivers/ sound/ firmware/
508	net-y := net/
509	libs-y := lib/
510	core-y := usr/
511	endif # KBUILD_EXTMOD
512
513	ifeq ($(dot-config),1)
514	# Read in config
515	-include include/config/auto.conf
516
517	ifeq ($(KBUILD_EXTMOD),)
518	# Read in dependencies to all Kconfig* files, make sure to run
519	# oldconfig if changes are detected.
520	-include include/config/auto.conf.cmd
521
522	# To avoid any implicit rule to kick in, define an empty command
523	$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
524
525	# If .config is newer than include/config/auto.conf, someone tinkered
526	# with it and forgot to run make oldconfig.
527	# if auto.conf.cmd is missing then we are probably in a cleaned tree so
528	# we execute the config step to be sure to catch updated Kconfig files
529	include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
530	$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
531	else
532	# external modules needs include/generated/autoconf.h and include/config/auto.conf
533	# but do not care if they are up-to-date. Use auto.conf to trigger the test
534	PHONY += include/config/auto.conf
535
536	include/config/auto.conf:
537	$(Q)test -e include/generated/autoconf.h -a -e $@ \|\| ( \
538	echo >&2; \
539	echo >&2 " ERROR: Kernel configuration is invalid."; \
540	echo >&2 " include/generated/autoconf.h or $@ are missing.";\
541	echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
542	echo >&2 ; \
543	/bin/false)
544
545	endif # KBUILD_EXTMOD
546
547	else
548	# Dummy target needed, because used as prerequisite
549	include/config/auto.conf: ;
550	endif # $(dot-config)
551
552	# The all: target is the default when no target is given on the
553	# command line.
554	# This allow a user to issue only 'make' to build a kernel including modules
555	# Defaults to vmlinux, but the arch makefile usually adds further targets
556	all: vmlinux
557
558	ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
559	KBUILD_CFLAGS += -Os
560	else
561	KBUILD_CFLAGS += -O2
562	endif
563
564	include $(srctree)/arch/$(SRCARCH)/Makefile
565
566	ifdef CONFIG_READABLE_ASM
567	# Disable optimizations that make assembler listings hard to read.
568	# reorder blocks reorders the control in the function
569	# ipa clone creates specialized cloned functions
570	# partial inlining inlines only parts of functions
571	KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
572	$(call cc-option,-fno-ipa-cp-clone,) \
573	$(call cc-option,-fno-partial-inlining)
574	endif
575
576	ifneq ($(CONFIG_FRAME_WARN),0)
577	KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
578	endif
579
580	# Force gcc to behave correct even for buggy distributions
581	ifndef CONFIG_CC_STACKPROTECTOR
582	KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
583	endif
584
585	# This warning generated too much noise in a regular build.
586	# Use make W=1 to enable this warning (see scripts/Makefile.build)
587	KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
588
589	ifdef CONFIG_FRAME_POINTER
590	KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
591	else
592	# Some targets (ARM with Thumb2, for example), can't be built with frame
593	# pointers. For those, we don't have FUNCTION_TRACER automatically
594	# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
595	# incompatible with -fomit-frame-pointer with current GCC, so we don't use
596	# -fomit-frame-pointer with FUNCTION_TRACER.
597	ifndef CONFIG_FUNCTION_TRACER
598	KBUILD_CFLAGS += -fomit-frame-pointer
599	endif
600	endif
601
602	ifdef CONFIG_DEBUG_INFO
603	KBUILD_CFLAGS += -g
604	KBUILD_AFLAGS += -gdwarf-2
605	endif
606
607	ifdef CONFIG_DEBUG_INFO_REDUCED
608	KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly)
609	endif
610
611	ifdef CONFIG_FUNCTION_TRACER
612	KBUILD_CFLAGS += -pg
613	ifdef CONFIG_DYNAMIC_FTRACE
614	ifdef CONFIG_HAVE_C_RECORDMCOUNT
615	BUILD_C_RECORDMCOUNT := y
616	export BUILD_C_RECORDMCOUNT
617	endif
618	endif
619	endif
620
621	# We trigger additional mismatches with less inlining
622	ifdef CONFIG_DEBUG_SECTION_MISMATCH
623	KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
624	endif
625
626	# arch Makefile may override CC so keep this after arch Makefile is included
627	NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
628	CHECKFLAGS += $(NOSTDINC_FLAGS)
629
630	# warn about C99 declaration after statement
631	KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
632
633	# disable pointer signed / unsigned warnings in gcc 4.0
634	KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
635
636	# disable invalid "can't wrap" optimizations for signed / pointers
637	KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
638
639	# conserve stack if available
640	KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
641
642	# use the deterministic mode of AR if available
643	KBUILD_ARFLAGS := $(call ar-option,D)
644
645	# check for 'asm goto'
646	ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
647	KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
648	endif
649
650	# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
651	# But warn user when we do so
652	warn-assign = \
653	$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
654
655	ifneq ($(KCPPFLAGS),)
656	$(call warn-assign,CPPFLAGS)
657	KBUILD_CPPFLAGS += $(KCPPFLAGS)
658	endif
659	ifneq ($(KAFLAGS),)
660	$(call warn-assign,AFLAGS)
661	KBUILD_AFLAGS += $(KAFLAGS)
662	endif
663	ifneq ($(KCFLAGS),)
664	$(call warn-assign,CFLAGS)
665	KBUILD_CFLAGS += $(KCFLAGS)
666	endif
667
668	# Use --build-id when available.
669	LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
670	$(call cc-ldoption, -Wl$(comma)--build-id,))
671	KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
672	LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
673
674	ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
675	LDFLAGS_vmlinux += $(call ld-option, -X,)
676	endif
677
678	# Default kernel image to build when no specific target is given.
679	# KBUILD_IMAGE may be overruled on the command line or
680	# set in the environment
681	# Also any assignments in arch/$(ARCH)/Makefile take precedence over
682	# this default value
683	export KBUILD_IMAGE ?= vmlinux
684
685	#
686	# INSTALL_PATH specifies where to place the updated kernel and system map
687	# images. Default is /boot, but you can set it to other values
688	export INSTALL_PATH ?= /boot
689
690	#
691	# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
692	# relocations required by build roots. This is not defined in the
693	# makefile but the argument can be passed to make if needed.
694	#
695
696	MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
697	export MODLIB
698
699	#
700	# INSTALL_MOD_STRIP, if defined, will cause modules to be
701	# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
702	# the default option --strip-debug will be used. Otherwise,
703	# INSTALL_MOD_STRIP value will be used as the options to the strip command.
704
705	ifdef INSTALL_MOD_STRIP
706	ifeq ($(INSTALL_MOD_STRIP),1)
707	mod_strip_cmd = $(STRIP) --strip-debug
708	else
709	mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
710	endif # INSTALL_MOD_STRIP=1
711	else
712	mod_strip_cmd = true
713	endif # INSTALL_MOD_STRIP
714	export mod_strip_cmd
715
716
717	ifeq ($(KBUILD_EXTMOD),)
718	core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
719
720	vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
721	$(core-y) $(core-m) $(drivers-y) $(drivers-m) \
722	$(net-y) $(net-m) $(libs-y) $(libs-m)))
723
724	vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
725	$(init-n) $(init-) \
726	$(core-n) $(core-) $(drivers-n) $(drivers-) \
727	$(net-n) $(net-) $(libs-n) $(libs-))))
728
729	init-y := $(patsubst %/, %/built-in.o, $(init-y))
730	core-y := $(patsubst %/, %/built-in.o, $(core-y))
731	drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
732	net-y := $(patsubst %/, %/built-in.o, $(net-y))
733	libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
734	libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
735	libs-y := $(libs-y1) $(libs-y2)
736
737	# Externally visible symbols (used by link-vmlinux.sh)
738	export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
739	export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
740	export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
741	export LDFLAGS_vmlinux
742
743	vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
744
745	# Final link of vmlinux
746	cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
747	quiet_cmd_link-vmlinux = LINK $@
748
749	# Include targets which we want to
750	# execute if the rest of the kernel build went well.
751	vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
752	ifdef CONFIG_HEADERS_CHECK
753	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
754	endif
755	ifdef CONFIG_SAMPLES
756	$(Q)$(MAKE) $(build)=samples
757	endif
758	ifdef CONFIG_BUILD_DOCSRC
759	$(Q)$(MAKE) $(build)=Documentation
760	endif
761	+$(call if_changed,link-vmlinux)
762
763	# The actual objects are generated when descending,
764	# make sure no implicit rule kicks in
765	$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
766
767	# Handle descending into subdirectories listed in $(vmlinux-dirs)
768	# Preset locale variables to speed up the build process. Limit locale
769	# tweaks to this spot to avoid wrong language settings when running
770	# make menuconfig etc.
771	# Error messages still appears in the original language
772
773	PHONY += $(vmlinux-dirs)
774	$(vmlinux-dirs): prepare scripts
775	$(Q)$(MAKE) $(build)=$@
776
777	# Store (new) KERNELRELASE string in include/config/kernel.release
778	include/config/kernel.release: include/config/auto.conf FORCE
779	$(Q)rm -f $@
780	$(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
781
782
783	# Things we need to do before we recursively start building the kernel
784	# or the modules are listed in "prepare".
785	# A multi level approach is used. prepareN is processed before prepareN-1.
786	# archprepare is used in arch Makefiles and when processed asm symlink,
787	# version.h and scripts_basic is processed / created.
788
789	# Listed in dependency order
790	PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
791
792	# prepare3 is used to check if we are building in a separate output directory,
793	# and if so do:
794	# 1) Check that make has not been executed in the kernel src $(srctree)
795	prepare3: include/config/kernel.release
796	ifneq ($(KBUILD_SRC),)
797	@$(kecho) ' Using $(srctree) as source for kernel'
798	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
799	echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
800	echo >&2 " in the '$(srctree)' directory.";\
801	/bin/false; \
802	fi;
803	endif
804
805	# prepare2 creates a makefile if using a separate output directory
806	prepare2: prepare3 outputmakefile asm-generic
807
808	prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
809	include/config/auto.conf
810	$(cmd_crmodverdir)
811
812	archprepare: archheaders archscripts prepare1 scripts_basic
813
814	prepare0: archprepare FORCE
815	$(Q)$(MAKE) $(build)=.
816
817	# All the preparing..
818	prepare: prepare0
819
820	# Generate some files
821	# ---------------------------------------------------------------------------
822
823	# KERNELRELEASE can change from a few different places, meaning version.h
824	# needs to be updated, so this check is forced on all builds
825
826	uts_len := 64
827	define filechk_utsrelease.h
828	if [ `echo -n "$(KERNELRELEASE)" \| wc -c ` -gt $(uts_len) ]; then \
829	echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
830	exit 1; \
831	fi; \
832	(echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
833	endef
834
835	define filechk_version.h
836	(echo \#define LINUX_VERSION_CODE $(shell \
837	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
838	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
839	endef
840
841	include/linux/version.h: $(srctree)/Makefile FORCE
842	$(call filechk,version.h)
843
844	include/generated/utsrelease.h: include/config/kernel.release FORCE
845	$(call filechk,utsrelease.h)
846
847	PHONY += headerdep
848	headerdep:
849	$(Q)find $(srctree)/include/ -name '*.h' \| xargs --max-args 1 \
850	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
851
852	# ---------------------------------------------------------------------------
853
854	PHONY += depend dep
855	depend dep:
856	@echo '*** Warning: make $@ is unnecessary now.'
857
858	# ---------------------------------------------------------------------------
859	# Firmware install
860	INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
861	export INSTALL_FW_PATH
862
863	PHONY += firmware_install
864	firmware_install: FORCE
865	@mkdir -p $(objtree)/firmware
866	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
867
868	# ---------------------------------------------------------------------------
869	# Kernel headers
870
871	#Default location for installed headers
872	export INSTALL_HDR_PATH = $(objtree)/usr
873
874	hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
875
876	# If we do an all arch process set dst to asm-$(hdr-arch)
877	hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
878
879	PHONY += archheaders
880	archheaders:
881
882	PHONY += archscripts
883	archscripts:
884
885	PHONY += __headers
886	__headers: include/linux/version.h scripts_basic asm-generic archheaders archscripts FORCE
887	$(Q)$(MAKE) $(build)=scripts build_unifdef
888
889	PHONY += headers_install_all
890	headers_install_all:
891	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
892
893	PHONY += headers_install
894	headers_install: __headers
895	$(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
896	$(error Headers not exportable for the $(SRCARCH) architecture))
897	$(Q)$(MAKE) $(hdr-inst)=include
898	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
899
900	PHONY += headers_check_all
901	headers_check_all: headers_install_all
902	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
903
904	PHONY += headers_check
905	headers_check: headers_install
906	$(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
907	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
908
909	# ---------------------------------------------------------------------------
910	# Modules
911
912	ifdef CONFIG_MODULES
913
914	# By default, build modules as well
915
916	all: modules
917
918	# Build modules
919	#
920	# A module can be listed more than once in obj-m resulting in
921	# duplicate lines in modules.order files. Those are removed
922	# using awk while concatenating to the final file.
923
924	PHONY += modules
925	modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
926	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
927	@$(kecho) ' Building modules, stage 2.';
928	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
929	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
930
931	modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
932	$(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
933
934	%/modules.builtin: include/config/auto.conf
935	$(Q)$(MAKE) $(modbuiltin)=$*
936
937
938	# Target to prepare building external modules
939	PHONY += modules_prepare
940	modules_prepare: prepare scripts
941
942	# Target to install modules
943	PHONY += modules_install
944	modules_install: _modinst_ _modinst_post
945
946	PHONY += _modinst_
947	_modinst_:
948	@rm -rf $(MODLIB)/kernel
949	@rm -f $(MODLIB)/source
950	@mkdir -p $(MODLIB)/kernel
951	@ln -s $(srctree) $(MODLIB)/source
952	@if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
953	rm -f $(MODLIB)/build ; \
954	ln -s $(objtree) $(MODLIB)/build ; \
955	fi
956	@cp -f $(objtree)/modules.order $(MODLIB)/
957	@cp -f $(objtree)/modules.builtin $(MODLIB)/
958	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
959
960	# This depmod is only for convenience to give the initial
961	# boot a modules.dep even before / is mounted read-write. However the
962	# boot script depmod is the master version.
963	PHONY += _modinst_post
964	_modinst_post: _modinst_
965	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
966	$(call cmd,depmod)
967
968	else # CONFIG_MODULES
969
970	# Modules not configured
971	# ---------------------------------------------------------------------------
972
973	modules modules_install: FORCE
974	@echo >&2
975	@echo >&2 "The present kernel configuration has modules disabled."
976	@echo >&2 "Type 'make config' and enable loadable module support."
977	@echo >&2 "Then build a kernel with module support enabled."
978	@echo >&2
979	@exit 1
980
981	endif # CONFIG_MODULES
982
983	###
984	# Cleaning is done on three levels.
985	# make clean Delete most generated files
986	# Leave enough to build external modules
987	# make mrproper Delete the current configuration, and all generated files
988	# make distclean Remove editor backup files, patch leftover files and the like
989
990	# Directories & files removed with 'make clean'
991	CLEAN_DIRS += $(MODVERDIR)
992
993	# Directories & files removed with 'make mrproper'
994	MRPROPER_DIRS += include/config usr/include include/generated \
995	arch/*/include/generated
996	MRPROPER_FILES += .config .config.old .version .old_version \
997	include/linux/version.h \
998	Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
999
1000	# clean - Delete most, but leave enough to build external modules
1001	#
1002	clean: rm-dirs := $(CLEAN_DIRS)
1003	clean: rm-files := $(CLEAN_FILES)
1004	clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1005
1006	PHONY += $(clean-dirs) clean archclean
1007	$(clean-dirs):
1008	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1009
1010	clean: archclean
1011
1012	# mrproper - Delete all generated files, including .config
1013	#
1014	mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1015	mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1016	mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1017
1018	PHONY += $(mrproper-dirs) mrproper archmrproper
1019	$(mrproper-dirs):
1020	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1021
1022	mrproper: clean archmrproper $(mrproper-dirs)
1023	$(call cmd,rmdirs)
1024	$(call cmd,rmfiles)
1025
1026	# distclean
1027	#
1028	PHONY += distclean
1029
1030	distclean: mrproper
1031	@find $(srctree) $(RCS_FIND_IGNORE) \
1032	\( -name '.orig' -o -name '.rej' -o -name '*~' \
1033	-o -name '.bak' -o -name '##' -o -name '.*.orig' \
1034	-o -name '.*.rej' \
1035	-o -name '%' -o -name '..cmd' -o -name 'core' \) \
1036	-type f -print \| xargs rm -f
1037
1038
1039	# Packaging of the kernel to various formats
1040	# ---------------------------------------------------------------------------
1041	# rpm target kept for backward compatibility
1042	package-dir := $(srctree)/scripts/package
1043
1044	%src-pkg: FORCE
1045	$(Q)$(MAKE) $(build)=$(package-dir) $@
1046	%pkg: include/config/kernel.release FORCE
1047	$(Q)$(MAKE) $(build)=$(package-dir) $@
1048	rpm: include/config/kernel.release FORCE
1049	$(Q)$(MAKE) $(build)=$(package-dir) $@
1050
1051
1052	# Brief documentation of the typical targets used
1053	# ---------------------------------------------------------------------------
1054
1055	boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1056	boards := $(notdir $(boards))
1057	board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs//_defconfig))
1058	board-dirs := $(sort $(notdir $(board-dirs:/=)))
1059
1060	help:
1061	@echo 'Cleaning targets:'
1062	@echo ' clean - Remove most generated files but keep the config and'
1063	@echo ' enough build support to build external modules'
1064	@echo ' mrproper - Remove all generated files + config + various backup files'
1065	@echo ' distclean - mrproper + remove editor backup and patch files'
1066	@echo ''
1067	@echo 'Configuration targets:'
1068	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1069	@echo ''
1070	@echo 'Other generic targets:'
1071	@echo ' all - Build all targets marked with [*]'
1072	@echo '* vmlinux - Build the bare kernel'
1073	@echo '* modules - Build all modules'
1074	@echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1075	@echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1076	@echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1077	@echo ' dir/ - Build all files in dir and below'
1078	@echo ' dir/file.[oisS] - Build specified target only'
1079	@echo ' dir/file.lst - Build specified mixed source/assembly target only'
1080	@echo ' (requires a recent binutils and recent build (System.map))'
1081	@echo ' dir/file.ko - Build module including final link'
1082	@echo ' modules_prepare - Set up for building external modules'
1083	@echo ' tags/TAGS - Generate tags file for editors'
1084	@echo ' cscope - Generate cscope index'
1085	@echo ' gtags - Generate GNU GLOBAL index'
1086	@echo ' kernelrelease - Output the release version string'
1087	@echo ' kernelversion - Output the version stored in Makefile'
1088	@echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1089	echo ' (default: $(INSTALL_HDR_PATH))'; \
1090	echo ''
1091	@echo 'Static analysers'
1092	@echo ' checkstack - Generate a list of stack hogs'
1093	@echo ' namespacecheck - Name space analysis on compiled kernel'
1094	@echo ' versioncheck - Sanity check on version.h usage'
1095	@echo ' includecheck - Check for duplicate included header files'
1096	@echo ' export_report - List the usages of all exported symbols'
1097	@echo ' headers_check - Sanity check on exported headers'
1098	@echo ' headerdep - Detect inclusion cycles in headers'
1099	@$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1100	@echo ''
1101	@echo 'Kernel packaging:'
1102	@$(MAKE) $(build)=$(package-dir) help
1103	@echo ''
1104	@echo 'Documentation targets:'
1105	@$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1106	@echo ''
1107	@echo 'Architecture specific targets ($(SRCARCH)):'
1108	@$(if $(archhelp),$(archhelp),\
1109	echo ' No architecture specific help defined for $(SRCARCH)')
1110	@echo ''
1111	@$(if $(boards), \
1112	$(foreach b, $(boards), \
1113	printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1114	echo '')
1115	@$(if $(board-dirs), \
1116	$(foreach b, $(board-dirs), \
1117	printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1118	printf " %-16s - Show all of the above\\n" help-boards; \
1119	echo '')
1120
1121	@echo ' make V=0\|1 [targets] 0 => quiet build (default), 1 => verbose build'
1122	@echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1123	@echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1124	@echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1125	@echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1126	@echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1127	@echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1128	@echo ' 1: warnings which may be relevant and do not occur too often'
1129	@echo ' 2: warnings which occur quite often but may still be relevant'
1130	@echo ' 3: more obscure warnings, can most likely be ignored'
1131	@echo ' Multiple levels can be combined with W=12 or W=123'
1132	@echo ''
1133	@echo 'Execute "make" or "make all" to build all targets marked with [*] '
1134	@echo 'For further info see the ./README file'
1135
1136
1137	help-board-dirs := $(addprefix help-,$(board-dirs))
1138
1139	help-boards: $(help-board-dirs)
1140
1141	boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$/_defconfig))
1142
1143	$(help-board-dirs): help-%:
1144	@echo 'Architecture specific targets ($(SRCARCH) $*):'
1145	@$(if $(boards-per-dir), \
1146	$(foreach b, $(boards-per-dir), \
1147	printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1148	echo '')
1149
1150
1151	# Documentation targets
1152	# ---------------------------------------------------------------------------
1153	%docs: scripts_basic FORCE
1154	$(Q)$(MAKE) $(build)=scripts build_docproc
1155	$(Q)$(MAKE) $(build)=Documentation/DocBook $@
1156
1157	else # KBUILD_EXTMOD
1158
1159	###
1160	# External module support.
1161	# When building external modules the kernel used as basis is considered
1162	# read-only, and no consistency checks are made and the make
1163	# system is not used on the basis kernel. If updates are required
1164	# in the basis kernel ordinary make commands (without M=...) must
1165	# be used.
1166	#
1167	# The following are the only valid targets when building external
1168	# modules.
1169	# make M=dir clean Delete all automatically generated files
1170	# make M=dir modules Make all modules in specified dir
1171	# make M=dir Same as 'make M=dir modules'
1172	# make M=dir modules_install
1173	# Install the modules built in the module directory
1174	# Assumes install directory is already created
1175
1176	# We are always building modules
1177	KBUILD_MODULES := 1
1178	PHONY += crmodverdir
1179	crmodverdir:
1180	$(cmd_crmodverdir)
1181
1182	PHONY += $(objtree)/Module.symvers
1183	$(objtree)/Module.symvers:
1184	@test -e $(objtree)/Module.symvers \|\| ( \
1185	echo; \
1186	echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1187	echo " is missing; modules will have no dependencies and modversions."; \
1188	echo )
1189
1190	module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1191	PHONY += $(module-dirs) modules
1192	$(module-dirs): crmodverdir $(objtree)/Module.symvers
1193	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1194
1195	modules: $(module-dirs)
1196	@$(kecho) ' Building modules, stage 2.';
1197	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1198
1199	PHONY += modules_install
1200	modules_install: _emodinst_ _emodinst_post
1201
1202	install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1203	PHONY += _emodinst_
1204	_emodinst_:
1205	$(Q)mkdir -p $(MODLIB)/$(install-dir)
1206	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1207
1208	PHONY += _emodinst_post
1209	_emodinst_post: _emodinst_
1210	$(call cmd,depmod)
1211
1212	clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1213
1214	PHONY += $(clean-dirs) clean
1215	$(clean-dirs):
1216	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1217
1218	clean: rm-dirs := $(MODVERDIR)
1219	clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1220
1221	help:
1222	@echo ' Building external modules.'
1223	@echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1224	@echo ''
1225	@echo ' modules - default target, build the module(s)'
1226	@echo ' modules_install - install the module'
1227	@echo ' clean - remove generated files in module directory only'
1228	@echo ''
1229
1230	# Dummies...
1231	PHONY += prepare scripts
1232	prepare: ;
1233	scripts: ;
1234	endif # KBUILD_EXTMOD
1235
1236	clean: $(clean-dirs)
1237	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1238	$(call cmd,rmdirs)
1239	$(call cmd,rmfiles)
1240	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1241	\( -name '.[oas]' -o -name '.ko' -o -name '.*.cmd' \
1242	-o -name '..d' -o -name '..tmp' -o -name '*.mod.c' \
1243	-o -name '*.symtypes' -o -name 'modules.order' \
1244	-o -name modules.builtin -o -name '.tmp_.o.' \
1245	-o -name '*.gcno' \) -type f -print \| xargs rm -f
1246
1247	# Generate tags for editors
1248	# ---------------------------------------------------------------------------
1249	quiet_cmd_tags = GEN $@
1250	cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1251
1252	tags TAGS cscope gtags: FORCE
1253	$(call cmd,tags)
1254
1255	# Scripts to check various things for consistency
1256	# ---------------------------------------------------------------------------
1257
1258	PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1259
1260	includecheck:
1261	find $(srctree)/* $(RCS_FIND_IGNORE) \
1262	-name '*.[hcS]' -type f -print \| sort \
1263	\| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1264
1265	versioncheck:
1266	find $(srctree)/* $(RCS_FIND_IGNORE) \
1267	-name '*.[hcS]' -type f -print \| sort \
1268	\| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1269
1270	coccicheck:
1271	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1272
1273	namespacecheck:
1274	$(PERL) $(srctree)/scripts/namespace.pl
1275
1276	export_report:
1277	$(PERL) $(srctree)/scripts/export_report.pl
1278
1279	endif #ifeq ($(config-targets),1)
1280	endif #ifeq ($(mixed-targets),1)
1281
1282	PHONY += checkstack kernelrelease kernelversion
1283
1284	# UML needs a little special treatment here. It wants to use the host
1285	# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1286	# else wants $(ARCH), including people doing cross-builds, which means
1287	# that $(SUBARCH) doesn't work here.
1288	ifeq ($(ARCH), um)
1289	CHECKSTACK_ARCH := $(SUBARCH)
1290	else
1291	CHECKSTACK_ARCH := $(ARCH)
1292	endif
1293	checkstack:
1294	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') \| \
1295	$(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1296
1297	kernelrelease:
1298	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1299
1300	kernelversion:
1301	@echo $(KERNELVERSION)
1302
1303	# Clear a bunch of variables before executing the submake
1304	tools/: FORCE
1305	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS= -C $(src)/tools/
1306
1307	tools/%: FORCE
1308	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS= -C $(src)/tools/ $*
1309
1310	# Single targets
1311	# ---------------------------------------------------------------------------
1312	# Single targets are compatible with:
1313	# - build with mixed source and output
1314	# - build with separate output dir 'make O=...'
1315	# - external modules
1316	#
1317	# target-dir => where to store outputfile
1318	# build-dir => directory in kernel source tree to use
1319
1320	ifeq ($(KBUILD_EXTMOD),)
1321	build-dir = $(patsubst %/,%,$(dir $@))
1322	target-dir = $(dir $@)
1323	else
1324	zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1325	build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1326	target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1327	endif
1328
1329	%.s: %.c prepare scripts FORCE
1330	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1331	%.i: %.c prepare scripts FORCE
1332	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1333	%.o: %.c prepare scripts FORCE
1334	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1335	%.lst: %.c prepare scripts FORCE
1336	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1337	%.s: %.S prepare scripts FORCE
1338	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1339	%.o: %.S prepare scripts FORCE
1340	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1341	%.symtypes: %.c prepare scripts FORCE
1342	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1343
1344	# Modules
1345	/: prepare scripts FORCE
1346	$(cmd_crmodverdir)
1347	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1348	$(build)=$(build-dir)
1349	%/: prepare scripts FORCE
1350	$(cmd_crmodverdir)
1351	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1352	$(build)=$(build-dir)
1353	%.ko: prepare scripts FORCE
1354	$(cmd_crmodverdir)
1355	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1356	$(build)=$(build-dir) $(@:.ko=.o)
1357	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1358
1359	# FIXME Should go into a make.lib or something
1360	# ===========================================================================
1361
1362	quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1363	cmd_rmdirs = rm -rf $(rm-dirs)
1364
1365	quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1366	cmd_rmfiles = rm -f $(rm-files)
1367
1368	# Run depmod only if we have System.map and depmod is executable
1369	quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1370	cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1371	$(KERNELRELEASE)
1372
1373	# Create temporary dir for module support files
1374	# clean it up only when building all modules
1375	cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1376	$(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1377
1378	# read all saved command lines
1379
1380	targets := $(wildcard $(sort $(targets)))
1381	cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1382
1383	ifneq ($(cmd_files),)
1384	$(cmd_files): ; # Do not try to update included dependency files
1385	include $(cmd_files)
1386	endif
1387
1388	# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1389	# Usage:
1390	# $(Q)$(MAKE) $(clean)=dir
1391	clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1392
1393	endif # skip-makefile
1394
1395	PHONY += FORCE
1396	FORCE:
1397
1398	# Declare the contents of the .PHONY variable as phony. We keep that
1399	# information in a variable so we can use it in if_changed and friends.
1400	.PHONY: $(PHONY)
1401

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