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source: src/linux/universal/linux-3.2/Makefile @ 18510

Last change on this file since 18510 was 18510, checked in by BrainSlayer, 16 months ago
reduce size a little bit
File size: 52.2 KB

Line
1	VERSION = 3
2	PATCHLEVEL = 2
3	SUBLEVEL = 6
4	EXTRAVERSION =
5	NAME = Saber-toothed Squirrel
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	ifeq ($(ARCH),armeb)
168	ARCH := arm
169	endif
170	ifeq ($(ARCH),mipsel)
171	ARCH=mips
172	endif
173
174	SUBARCH := $(ARCH)
175
176	# Cross compiling and selecting different set of gcc/bin-utils
177	# ---------------------------------------------------------------------------
178	#
179	# When performing cross compilation for other architectures ARCH shall be set
180	# to the target architecture. (See arch/* for the possibilities).
181	# ARCH can be set during invocation of make:
182	# make ARCH=ia64
183	# Another way is to have ARCH set in the environment.
184	# The default ARCH is the host where make is executed.
185
186	# CROSS_COMPILE specify the prefix used for all executables used
187	# during compilation. Only gcc and related bin-utils executables
188	# are prefixed with $(CROSS_COMPILE).
189	# CROSS_COMPILE can be set on the command line
190	# make CROSS_COMPILE=ia64-linux-
191	# Alternatively CROSS_COMPILE can be set in the environment.
192	# A third alternative is to store a setting in .config so that plain
193	# "make" in the configured kernel build directory always uses that.
194	# Default value for CROSS_COMPILE is not to prefix executables
195	# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
196	export KBUILD_BUILDHOST := $(SUBARCH)
197	ARCH ?= $(SUBARCH)
198	CROSS_COMPILE ?= ccache $(CONFIG_CROSS_COMPILE:"%"=%)
199
200	# Architecture as present in compile.h
201	UTS_MACHINE := $(ARCH)
202	SRCARCH := $(ARCH)
203
204	# Additional ARCH settings for x86
205	ifeq ($(ARCH),i386)
206	SRCARCH := x86
207	endif
208	ifeq ($(ARCH),x86_64)
209	SRCARCH := x86
210	endif
211
212	# Additional ARCH settings for sparc
213	ifeq ($(ARCH),sparc32)
214	SRCARCH := sparc
215	endif
216	ifeq ($(ARCH),sparc64)
217	SRCARCH := sparc
218	endif
219
220	# Additional ARCH settings for sh
221	ifeq ($(ARCH),sh64)
222	SRCARCH := sh
223	endif
224
225	# Additional ARCH settings for tile
226	ifeq ($(ARCH),tilepro)
227	SRCARCH := tile
228	endif
229	ifeq ($(ARCH),tilegx)
230	SRCARCH := tile
231	endif
232
233	# Where to locate arch specific headers
234	hdr-arch := $(SRCARCH)
235
236	ifeq ($(ARCH),m68knommu)
237	hdr-arch := m68k
238	endif
239
240	KCONFIG_CONFIG ?= .config
241	export KCONFIG_CONFIG
242
243	# SHELL used by kbuild
244	CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
245	else if [ -x /bin/bash ]; then echo /bin/bash; \
246	else echo sh; fi ; fi)
247
248	HOSTCC = gcc
249	HOSTCXX = g++
250	HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
251	HOSTCXXFLAGS = -O2
252
253	# Decide whether to build built-in, modular, or both.
254	# Normally, just do built-in.
255
256	KBUILD_MODULES :=
257	KBUILD_BUILTIN := 1
258
259	# If we have only "make modules", don't compile built-in objects.
260	# When we're building modules with modversions, we need to consider
261	# the built-in objects during the descend as well, in order to
262	# make sure the checksums are up to date before we record them.
263
264	ifeq ($(MAKECMDGOALS),modules)
265	KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
266	endif
267
268	# If we have "make <whatever> modules", compile modules
269	# in addition to whatever we do anyway.
270	# Just "make" or "make all" shall build modules as well
271
272	ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
273	KBUILD_MODULES := 1
274	endif
275
276	ifeq ($(MAKECMDGOALS),)
277	KBUILD_MODULES := 1
278	endif
279
280	export KBUILD_MODULES KBUILD_BUILTIN
281	export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
282
283	# Beautify output
284	# ---------------------------------------------------------------------------
285	#
286	# Normally, we echo the whole command before executing it. By making
287	# that echo $($(quiet)$(cmd)), we now have the possibility to set
288	# $(quiet) to choose other forms of output instead, e.g.
289	#
290	# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
291	# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
292	#
293	# If $(quiet) is empty, the whole command will be printed.
294	# If it is set to "quiet_", only the short version will be printed.
295	# If it is set to "silent_", nothing will be printed at all, since
296	# the variable $(silent_cmd_cc_o_c) doesn't exist.
297	#
298	# A simple variant is to prefix commands with $(Q) - that's useful
299	# for commands that shall be hidden in non-verbose mode.
300	#
301	# $(Q)ln $@ :<
302	#
303	# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
304	# If KBUILD_VERBOSE equals 1 then the above command is displayed.
305
306	ifeq ($(KBUILD_VERBOSE),1)
307	quiet =
308	Q =
309	else
310	quiet=quiet_
311	Q = @
312	endif
313
314	# If the user is running make -s (silent mode), suppress echoing of
315	# commands
316
317	ifneq ($(findstring s,$(MAKEFLAGS)),)
318	quiet=silent_
319	endif
320
321	export quiet Q KBUILD_VERBOSE
322
323
324	# Look for make include files relative to root of kernel src
325	MAKEFLAGS += --include-dir=$(srctree)
326
327	# We need some generic definitions (do not try to remake the file).
328	$(srctree)/scripts/Kbuild.include: ;
329	include $(srctree)/scripts/Kbuild.include
330
331	# Make variables (CC, etc...)
332
333	AS = $(CROSS_COMPILE)as
334	LD = $(CROSS_COMPILE)ld
335	CC = $(CROSS_COMPILE)gcc
336	CPP = $(CC) -E
337	AR = $(CROSS_COMPILE)ar
338	NM = $(CROSS_COMPILE)nm
339	STRIP = $(CROSS_COMPILE)strip
340	OBJCOPY = $(CROSS_COMPILE)objcopy
341	OBJDUMP = $(CROSS_COMPILE)objdump
342	AWK = awk
343	GENKSYMS = scripts/genksyms/genksyms
344	INSTALLKERNEL := installkernel
345	DEPMOD = /sbin/depmod
346	KALLSYMS = scripts/kallsyms
347	PERL = perl
348	CHECK = sparse
349
350	CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
351	-Wbitwise -Wno-return-void $(CF)
352	CFLAGS_MODULE =
353	AFLAGS_MODULE =
354	LDFLAGS_MODULE =
355	CFLAGS_KERNEL =
356	AFLAGS_KERNEL =
357	CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
358
359
360	# Use LINUXINCLUDE when you must reference the include/ directory.
361	# Needed to be compatible with the O= option
362	LINUXINCLUDE := -I$(srctree)/arch/$(hdr-arch)/include \
363	-Iarch/$(hdr-arch)/include/generated -Iinclude \
364	$(if $(KBUILD_SRC), -I$(srctree)/include) \
365	-include $(srctree)/include/linux/kconfig.h
366
367	KBUILD_CPPFLAGS := -D__KERNEL__
368
369	KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
370	-fno-strict-aliasing -fno-common \
371	-Werror-implicit-function-declaration \
372	-Wno-format-security \
373	-fno-delete-null-pointer-checks
374	KBUILD_AFLAGS_KERNEL :=
375	KBUILD_CFLAGS_KERNEL :=
376	KBUILD_AFLAGS := -D__ASSEMBLY__
377	KBUILD_AFLAGS_MODULE := -DMODULE
378	KBUILD_CFLAGS_MODULE := -DMODULE
379	KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds -s
380	KBUILD_LDFLAGS_MODULE_PREREQ :=
381
382	# Read KERNELRELEASE from include/config/kernel.release (if it exists)
383	KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
384	KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
385
386	export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
387	export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
388	export CPP AR NM STRIP OBJCOPY OBJDUMP
389	export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
390	export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE KBUILD_LDFLAGS_MODULE_PREREQ CHECK CHECKFLAGS
391
392	export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
393	export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
394	export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
395	export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
396	export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
397	export KBUILD_ARFLAGS
398
399	# When compiling out-of-tree modules, put MODVERDIR in the module
400	# tree rather than in the kernel tree. The kernel tree might
401	# even be read-only.
402	export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
403
404	# Files to ignore in find ... statements
405
406	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
407	export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
408
409	# ===========================================================================
410	# Rules shared between *config targets and build targets
411
412	# Basic helpers built in scripts/
413	PHONY += scripts_basic
414	scripts_basic:
415	$(Q)$(MAKE) $(build)=scripts/basic
416	$(Q)rm -f .tmp_quiet_recordmcount
417
418	# To avoid any implicit rule to kick in, define an empty command.
419	scripts/basic/%: scripts_basic ;
420
421	PHONY += outputmakefile
422	# outputmakefile generates a Makefile in the output directory, if using a
423	# separate output directory. This allows convenient use of make in the
424	# output directory.
425	outputmakefile:
426	ifneq ($(KBUILD_SRC),)
427	$(Q)ln -fsn $(srctree) source
428	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
429	$(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
430	endif
431
432	# Support for using generic headers in asm-generic
433	PHONY += asm-generic
434	asm-generic:
435	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
436	obj=arch/$(SRCARCH)/include/generated/asm
437
438	# To make sure we do not include .config for any of the *config targets
439	# catch them early, and hand them over to scripts/kconfig/Makefile
440	# It is allowed to specify more targets when calling make, including
441	# mixing *config targets and build targets.
442	# For example 'make oldconfig all'.
443	# Detect when mixed targets is specified, and make a second invocation
444	# of make so .config is not included in this case either (for *config).
445
446	no-dot-config-targets := clean mrproper distclean \
447	cscope gtags TAGS tags help %docs check% coccicheck \
448	include/linux/version.h headers_% \
449	kernelversion %src-pkg
450
451	config-targets := 0
452	mixed-targets := 0
453	dot-config := 1
454
455	ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
456	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
457	dot-config := 0
458	endif
459	endif
460
461	ifeq ($(KBUILD_EXTMOD),)
462	ifneq ($(filter config %config,$(MAKECMDGOALS)),)
463	config-targets := 1
464	ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
465	mixed-targets := 1
466	endif
467	endif
468	endif
469
470	ifeq ($(mixed-targets),1)
471	# ===========================================================================
472	# We're called with mixed targets (*config and build targets).
473	# Handle them one by one.
474
475	%:: FORCE
476	$(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
477
478	else
479	ifeq ($(config-targets),1)
480	# ===========================================================================
481	# *config targets only - make sure prerequisites are updated, and descend
482	# in scripts/kconfig to make the *config target
483
484	# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
485	# KBUILD_DEFCONFIG may point out an alternative default configuration
486	# used for 'make defconfig'
487	include $(srctree)/arch/$(SRCARCH)/Makefile
488	export KBUILD_DEFCONFIG KBUILD_KCONFIG
489
490	config: scripts_basic outputmakefile FORCE
491	$(Q)mkdir -p include/linux include/config
492	$(Q)$(MAKE) $(build)=scripts/kconfig $@
493
494	%config: scripts_basic outputmakefile FORCE
495	$(Q)mkdir -p include/linux include/config
496	$(Q)$(MAKE) $(build)=scripts/kconfig $@
497
498	else
499	# ===========================================================================
500	# Build targets only - this includes vmlinux, arch specific targets, clean
501	# targets and others. In general all targets except *config targets.
502
503	ifeq ($(KBUILD_EXTMOD),)
504	# Additional helpers built in scripts/
505	# Carefully list dependencies so we do not try to build scripts twice
506	# in parallel
507	PHONY += scripts
508	scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
509	$(Q)$(MAKE) $(build)=$(@)
510
511	# Objects we will link into vmlinux / subdirs we need to visit
512	init-y := init/
513	drivers-y := drivers/ sound/ firmware/
514	net-y := net/
515	libs-y := lib/
516	core-y := usr/
517	endif # KBUILD_EXTMOD
518
519	ifeq ($(dot-config),1)
520	# Read in config
521	-include include/config/auto.conf
522
523	ifeq ($(KBUILD_EXTMOD),)
524	# Read in dependencies to all Kconfig* files, make sure to run
525	# oldconfig if changes are detected.
526	-include include/config/auto.conf.cmd
527
528	# To avoid any implicit rule to kick in, define an empty command
529	$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
530
531	# If .config is newer than include/config/auto.conf, someone tinkered
532	# with it and forgot to run make oldconfig.
533	# if auto.conf.cmd is missing then we are probably in a cleaned tree so
534	# we execute the config step to be sure to catch updated Kconfig files
535	include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
536	$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
537	else
538	# external modules needs include/generated/autoconf.h and include/config/auto.conf
539	# but do not care if they are up-to-date. Use auto.conf to trigger the test
540	PHONY += include/config/auto.conf
541
542	include/config/auto.conf:
543	$(Q)test -e include/generated/autoconf.h -a -e $@ \|\| ( \
544	echo; \
545	echo " ERROR: Kernel configuration is invalid."; \
546	echo " include/generated/autoconf.h or $@ are missing.";\
547	echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
548	echo; \
549	/bin/false)
550
551	endif # KBUILD_EXTMOD
552
553	else
554	# Dummy target needed, because used as prerequisite
555	include/config/auto.conf: ;
556	endif # $(dot-config)
557
558	# The all: target is the default when no target is given on the
559	# command line.
560	# This allow a user to issue only 'make' to build a kernel including modules
561	# Defaults to vmlinux, but the arch makefile usually adds further targets
562	all: vmlinux
563
564	ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
565	KBUILD_CFLAGS += -Os -fno-caller-saves
566	else
567	KBUILD_CFLAGS += -O2 -fno-reorder-blocks -fno-tree-ch -fno-caller-saves
568	endif
569
570	include $(srctree)/arch/$(SRCARCH)/Makefile
571
572	ifneq ($(CONFIG_FRAME_WARN),0)
573	KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
574	endif
575
576	# Force gcc to behave correct even for buggy distributions
577	ifndef CONFIG_CC_STACKPROTECTOR
578	KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
579	endif
580
581	# This warning generated too much noise in a regular build.
582	# Use make W=1 to enable this warning (see scripts/Makefile.build)
583	KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
584
585	ifdef CONFIG_FRAME_POINTER
586	KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
587	else
588	# Some targets (ARM with Thumb2, for example), can't be built with frame
589	# pointers. For those, we don't have FUNCTION_TRACER automatically
590	# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
591	# incompatible with -fomit-frame-pointer with current GCC, so we don't use
592	# -fomit-frame-pointer with FUNCTION_TRACER.
593	ifndef CONFIG_FUNCTION_TRACER
594	KBUILD_CFLAGS += -fomit-frame-pointer
595	endif
596	endif
597
598	ifdef CONFIG_DEBUG_INFO
599	KBUILD_CFLAGS += -g
600	KBUILD_AFLAGS += -gdwarf-2
601	endif
602
603	ifdef CONFIG_DEBUG_INFO_REDUCED
604	KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly)
605	endif
606
607	ifdef CONFIG_FUNCTION_TRACER
608	KBUILD_CFLAGS += -pg
609	ifdef CONFIG_DYNAMIC_FTRACE
610	ifdef CONFIG_HAVE_C_RECORDMCOUNT
611	BUILD_C_RECORDMCOUNT := y
612	export BUILD_C_RECORDMCOUNT
613	endif
614	endif
615	endif
616
617	# We trigger additional mismatches with less inlining
618	ifdef CONFIG_DEBUG_SECTION_MISMATCH
619	KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
620	endif
621
622	# arch Makefile may override CC so keep this after arch Makefile is included
623	NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
624	CHECKFLAGS += $(NOSTDINC_FLAGS)
625
626	# improve gcc optimization
627	CFLAGS += $(call cc-option,-funit-at-a-time,)
628
629	# warn about C99 declaration after statement
630	KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
631
632	# disable pointer signed / unsigned warnings in gcc 4.0
633	KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
634
635	# disable invalid "can't wrap" optimizations for signed / pointers
636	KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
637
638	# conserve stack if available
639	KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
640
641	# use the deterministic mode of AR if available
642	KBUILD_ARFLAGS := $(call ar-option,D)
643
644	# check for 'asm goto'
645	ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
646	KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
647	endif
648
649	# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
650	# But warn user when we do so
651	warn-assign = \
652	$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
653
654	ifneq ($(KCPPFLAGS),)
655	$(call warn-assign,CPPFLAGS)
656	KBUILD_CPPFLAGS += $(KCPPFLAGS)
657	endif
658	ifneq ($(KAFLAGS),)
659	$(call warn-assign,AFLAGS)
660	KBUILD_AFLAGS += $(KAFLAGS)
661	endif
662	ifneq ($(KCFLAGS),)
663	$(call warn-assign,CFLAGS)
664	KBUILD_CFLAGS += $(KCFLAGS)
665	endif
666
667	# Use --build-id when available.
668	LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
669	$(call cc-ldoption, -Wl$(comma)--build-id,))
670	KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
671	LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
672
673	ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
674	LDFLAGS_vmlinux += $(call ld-option, -X,)
675	endif
676
677	# Default kernel image to build when no specific target is given.
678	# KBUILD_IMAGE may be overruled on the command line or
679	# set in the environment
680	# Also any assignments in arch/$(ARCH)/Makefile take precedence over
681	# this default value
682	export KBUILD_IMAGE ?= vmlinux
683
684	#
685	# INSTALL_PATH specifies where to place the updated kernel and system map
686	# images. Default is /boot, but you can set it to other values
687	export INSTALL_PATH ?= /boot
688
689	#
690	# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
691	# relocations required by build roots. This is not defined in the
692	# makefile but the argument can be passed to make if needed.
693	#
694
695	MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
696	export MODLIB
697
698	#
699	# INSTALL_MOD_STRIP, if defined, will cause modules to be
700	# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
701	# the default option --strip-debug will be used. Otherwise,
702	# INSTALL_MOD_STRIP value will be used as the options to the strip command.
703
704	ifdef INSTALL_MOD_STRIP
705	ifeq ($(INSTALL_MOD_STRIP),1)
706	mod_strip_cmd = $(STRIP) --strip-debug
707	else
708	mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
709	endif # INSTALL_MOD_STRIP=1
710	else
711	mod_strip_cmd = true
712	endif # INSTALL_MOD_STRIP
713	export mod_strip_cmd
714
715
716	ifeq ($(KBUILD_EXTMOD),)
717	core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
718
719	vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
720	$(core-y) $(core-m) $(drivers-y) $(drivers-m) \
721	$(net-y) $(net-m) $(libs-y) $(libs-m)))
722
723	vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
724	$(init-n) $(init-) \
725	$(core-n) $(core-) $(drivers-n) $(drivers-) \
726	$(net-n) $(net-) $(libs-n) $(libs-))))
727
728	init-y := $(patsubst %/, %/built-in.o, $(init-y))
729	core-y := $(patsubst %/, %/built-in.o, $(core-y))
730	drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
731	net-y := $(patsubst %/, %/built-in.o, $(net-y))
732	libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
733	libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
734	libs-y := $(libs-y1) $(libs-y2)
735
736	# Build vmlinux
737	# ---------------------------------------------------------------------------
738	# vmlinux is built from the objects selected by $(vmlinux-init) and
739	# $(vmlinux-main). Most are built-in.o files from top-level directories
740	# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
741	# Ordering when linking is important, and $(vmlinux-init) must be first.
742	#
743	# vmlinux
744	# ^
745	# \|
746	# +-< $(vmlinux-init)
747	# \| +--< init/version.o + more
748	# \|
749	# +--< $(vmlinux-main)
750	# \| +--< driver/built-in.o mm/built-in.o + more
751	# \|
752	# +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
753	#
754	# vmlinux version (uname -v) cannot be updated during normal
755	# descending-into-subdirs phase since we do not yet know if we need to
756	# update vmlinux.
757	# Therefore this step is delayed until just before final link of vmlinux -
758	# except in the kallsyms case where it is done just before adding the
759	# symbols to the kernel.
760	#
761	# System.map is generated to document addresses of all kernel symbols
762
763	vmlinux-init := $(head-y) $(init-y)
764	vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
765	vmlinux-all := $(vmlinux-init) $(vmlinux-main)
766	vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
767	export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
768
769	# Rule to link vmlinux - also used during CONFIG_KALLSYMS
770	# May be overridden by arch/$(ARCH)/Makefile
771	quiet_cmd_vmlinux__ ?= LD $@
772	cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
773	-T $(vmlinux-lds) $(vmlinux-init) \
774	--start-group $(vmlinux-main) --end-group \
775	$(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
776
777	# Generate new vmlinux version
778	quiet_cmd_vmlinux_version = GEN .version
779	cmd_vmlinux_version = set -e; \
780	if [ ! -r .version ]; then \
781	rm -f .version; \
782	echo 1 >.version; \
783	else \
784	mv .version .old_version; \
785	expr 0$$(cat .old_version) + 1 >.version; \
786	fi; \
787	$(MAKE) $(build)=init
788
789	# Generate System.map
790	quiet_cmd_sysmap = SYSMAP
791	cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
792
793	# Link of vmlinux
794	# If CONFIG_KALLSYMS is set .version is already updated
795	# Generate System.map and verify that the content is consistent
796	# Use + in front of the vmlinux_version rule to silent warning with make -j2
797	# First command is ':' to allow us to use + in front of the rule
798	define rule_vmlinux__
799	:
800	$(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
801
802	$(call cmd,vmlinux__)
803	$(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
804
805	$(Q)$(if $($(quiet)cmd_sysmap), \
806	echo ' $($(quiet)cmd_sysmap) System.map' &&) \
807	$(cmd_sysmap) $@ System.map; \
808	if [ $$? -ne 0 ]; then \
809	rm -f $@; \
810	/bin/false; \
811	fi;
812	$(verify_kallsyms)
813	endef
814
815
816	ifdef CONFIG_KALLSYMS
817	# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
818	# It's a three stage process:
819	# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
820	# empty
821	# Running kallsyms on that gives us .tmp_kallsyms1.o with
822	# the right size - vmlinux version (uname -v) is updated during this step
823	# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
824	# but due to the added section, some addresses have shifted.
825	# From here, we generate a correct .tmp_kallsyms2.o
826	# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
827	# o Verify that the System.map from vmlinux matches the map from
828	# .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
829	# o If 'make KALLSYMS_EXTRA_PASS=1" was used, do an extra pass using
830	# .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
831	# temporary bypass to allow the kernel to be built while the
832	# maintainers work out what went wrong with kallsyms.
833
834	last_kallsyms := 2
835
836	ifdef KALLSYMS_EXTRA_PASS
837	ifneq ($(KALLSYMS_EXTRA_PASS),0)
838	last_kallsyms := 3
839	endif
840	endif
841
842	kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
843
844	define verify_kallsyms
845	$(Q)$(if $($(quiet)cmd_sysmap), \
846	echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
847	$(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
848	$(Q)cmp -s System.map .tmp_System.map \|\| \
849	(echo Inconsistent kallsyms data; \
850	echo This is a bug - please report about it; \
851	echo Try "make KALLSYMS_EXTRA_PASS=1" as a workaround; \
852	rm .tmp_kallsyms* ; /bin/false )
853	endef
854
855	# Update vmlinux version before link
856	# Use + in front of this rule to silent warning about make -j1
857	# First command is ':' to allow us to use + in front of this rule
858	cmd_ksym_ld = $(cmd_vmlinux__)
859	define rule_ksym_ld
860	:
861	+$(call cmd,vmlinux_version)
862	$(call cmd,vmlinux__)
863	$(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
864	endef
865
866	# Generate .S file with all kernel symbols
867	quiet_cmd_kallsyms = KSYM $@
868	cmd_kallsyms = $(NM) -n $< \| $(KALLSYMS) \
869	$(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
870
871	.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
872	$(call if_changed_dep,as_o_S)
873
874	.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
875	$(call cmd,kallsyms)
876
877	# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
878	.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
879	$(call if_changed_rule,ksym_ld)
880
881	.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
882	$(call if_changed,vmlinux__)
883
884	.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
885	$(call if_changed,vmlinux__)
886
887	# Needs to visit scripts/ before $(KALLSYMS) can be used.
888	$(KALLSYMS): scripts ;
889
890	# Generate some data for debugging strange kallsyms problems
891	debug_kallsyms: .tmp_map$(last_kallsyms)
892
893	.tmp_map%: .tmp_vmlinux% FORCE
894	($(OBJDUMP) -h $< \| $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) \| sort > $@
895
896	.tmp_map3: .tmp_map2
897
898	.tmp_map2: .tmp_map1
899
900	endif # ifdef CONFIG_KALLSYMS
901
902	# Do modpost on a prelinked vmlinux. The finally linked vmlinux has
903	# relevant sections renamed as per the linker script.
904	quiet_cmd_vmlinux-modpost = LD $@
905	cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
906	$(vmlinux-init) --start-group $(vmlinux-main) --end-group \
907	$(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
908	define rule_vmlinux-modpost
909	:
910	+$(call cmd,vmlinux-modpost)
911	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
912	$(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
913	endef
914
915	# vmlinux image - including updated kernel symbols
916	vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
917	ifdef CONFIG_HEADERS_CHECK
918	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
919	endif
920	ifdef CONFIG_SAMPLES
921	$(Q)$(MAKE) $(build)=samples
922	endif
923	ifdef CONFIG_BUILD_DOCSRC
924	$(Q)$(MAKE) $(build)=Documentation
925	endif
926	$(call vmlinux-modpost)
927	$(call if_changed_rule,vmlinux__)
928	$(Q)rm -f .old_version
929
930	# build vmlinux.o first to catch section mismatch errors early
931	ifdef CONFIG_KALLSYMS
932	.tmp_vmlinux1: vmlinux.o
933	endif
934
935	modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
936	vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
937	$(call if_changed_rule,vmlinux-modpost)
938
939	# The actual objects are generated when descending,
940	# make sure no implicit rule kicks in
941	$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
942
943	# Handle descending into subdirectories listed in $(vmlinux-dirs)
944	# Preset locale variables to speed up the build process. Limit locale
945	# tweaks to this spot to avoid wrong language settings when running
946	# make menuconfig etc.
947	# Error messages still appears in the original language
948
949	PHONY += $(vmlinux-dirs)
950	$(vmlinux-dirs): prepare scripts
951	$(Q)$(MAKE) $(build)=$@
952
953	# Store (new) KERNELRELASE string in include/config/kernel.release
954	include/config/kernel.release: include/config/auto.conf FORCE
955	$(Q)rm -f $@
956	$(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
957
958
959	# Things we need to do before we recursively start building the kernel
960	# or the modules are listed in "prepare".
961	# A multi level approach is used. prepareN is processed before prepareN-1.
962	# archprepare is used in arch Makefiles and when processed asm symlink,
963	# version.h and scripts_basic is processed / created.
964
965	# Listed in dependency order
966	PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
967
968	# prepare3 is used to check if we are building in a separate output directory,
969	# and if so do:
970	# 1) Check that make has not been executed in the kernel src $(srctree)
971	prepare3: include/config/kernel.release
972	ifneq ($(KBUILD_SRC),)
973	@$(kecho) ' Using $(srctree) as source for kernel'
974	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
975	echo " $(srctree) is not clean, please run 'make mrproper'";\
976	echo " in the '$(srctree)' directory.";\
977	/bin/false; \
978	fi;
979	endif
980
981	# prepare2 creates a makefile if using a separate output directory
982	prepare2: prepare3 outputmakefile asm-generic
983
984	prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
985	include/config/auto.conf
986	$(cmd_crmodverdir)
987
988	archprepare: prepare1 scripts_basic
989
990	prepare0: archprepare FORCE
991	$(Q)$(MAKE) $(build)=.
992
993	# All the preparing..
994	prepare: prepare0
995
996	# Generate some files
997	# ---------------------------------------------------------------------------
998
999	# KERNELRELEASE can change from a few different places, meaning version.h
1000	# needs to be updated, so this check is forced on all builds
1001
1002	uts_len := 64
1003	define filechk_utsrelease.h
1004	if [ `echo -n "$(KERNELRELEASE)" \| wc -c ` -gt $(uts_len) ]; then \
1005	echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1006	exit 1; \
1007	fi; \
1008	(echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1009	endef
1010
1011	define filechk_version.h
1012	(echo \#define LINUX_VERSION_CODE $(shell \
1013	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1014	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1015	endef
1016
1017	include/linux/version.h: $(srctree)/Makefile FORCE
1018	$(call filechk,version.h)
1019
1020	include/generated/utsrelease.h: include/config/kernel.release FORCE
1021	$(call filechk,utsrelease.h)
1022
1023	PHONY += headerdep
1024	headerdep:
1025	$(Q)find $(srctree)/include/ -name '*.h' \| xargs --max-args 1 \
1026	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1027
1028	# ---------------------------------------------------------------------------
1029
1030	PHONY += depend dep
1031	depend dep:
1032	@echo '*** Warning: make $@ is unnecessary now.'
1033
1034	# ---------------------------------------------------------------------------
1035	# Firmware install
1036	INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1037	export INSTALL_FW_PATH
1038
1039	PHONY += firmware_install
1040	firmware_install: FORCE
1041	@mkdir -p $(objtree)/firmware
1042	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1043
1044	# ---------------------------------------------------------------------------
1045	# Kernel headers
1046
1047	#Default location for installed headers
1048	export INSTALL_HDR_PATH = $(objtree)/usr
1049
1050	hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1051
1052	# If we do an all arch process set dst to asm-$(hdr-arch)
1053	hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1054
1055	PHONY += __headers
1056	__headers: include/linux/version.h scripts_basic asm-generic FORCE
1057	$(Q)$(MAKE) $(build)=scripts build_unifdef
1058
1059	PHONY += headers_install_all
1060	headers_install_all:
1061	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1062
1063	PHONY += headers_install
1064	headers_install: __headers
1065	$(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1066	$(error Headers not exportable for the $(SRCARCH) architecture))
1067	$(Q)$(MAKE) $(hdr-inst)=include
1068	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1069
1070	PHONY += headers_check_all
1071	headers_check_all: headers_install_all
1072	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1073
1074	PHONY += headers_check
1075	headers_check: headers_install
1076	$(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1077	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1078
1079	# ---------------------------------------------------------------------------
1080	# Modules
1081
1082	ifdef CONFIG_MODULES
1083
1084	# By default, build modules as well
1085
1086	all: modules
1087
1088	# Build modules
1089	#
1090	# A module can be listed more than once in obj-m resulting in
1091	# duplicate lines in modules.order files. Those are removed
1092	# using awk while concatenating to the final file.
1093
1094	PHONY += modules
1095	modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1096	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1097	@$(kecho) ' Building modules, stage 2.';
1098	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1099	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1100
1101	modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1102	$(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1103
1104	%/modules.builtin: include/config/auto.conf
1105	$(Q)$(MAKE) $(modbuiltin)=$*
1106
1107
1108	# Target to prepare building external modules
1109	PHONY += modules_prepare
1110	modules_prepare: prepare scripts
1111
1112	# Target to install modules
1113	PHONY += modules_install
1114	modules_install: _modinst_ _modinst_post
1115
1116	PHONY += _modinst_
1117	_modinst_:
1118	@rm -rf $(MODLIB)/kernel
1119	@rm -f $(MODLIB)/source
1120	@mkdir -p $(MODLIB)/kernel
1121	@ln -s $(srctree) $(MODLIB)/source
1122	@if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1123	rm -f $(MODLIB)/build ; \
1124	ln -s $(objtree) $(MODLIB)/build ; \
1125	fi
1126	@cp -f $(objtree)/modules.order $(MODLIB)/
1127	@cp -f $(objtree)/modules.builtin $(MODLIB)/
1128	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1129
1130	# This depmod is only for convenience to give the initial
1131	# boot a modules.dep even before / is mounted read-write. However the
1132	# boot script depmod is the master version.
1133	PHONY += _modinst_post
1134	_modinst_post: _modinst_
1135	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1136	$(call cmd,depmod)
1137
1138	else # CONFIG_MODULES
1139
1140	# Modules not configured
1141	# ---------------------------------------------------------------------------
1142
1143	modules modules_install: FORCE
1144	@echo
1145	@echo "The present kernel configuration has modules disabled."
1146	@echo "Type 'make config' and enable loadable module support."
1147	@echo "Then build a kernel with module support enabled."
1148	@echo
1149	@exit 1
1150
1151	endif # CONFIG_MODULES
1152
1153	###
1154	# Cleaning is done on three levels.
1155	# make clean Delete most generated files
1156	# Leave enough to build external modules
1157	# make mrproper Delete the current configuration, and all generated files
1158	# make distclean Remove editor backup files, patch leftover files and the like
1159
1160	# Directories & files removed with 'make clean'
1161	CLEAN_DIRS += $(MODVERDIR)
1162	CLEAN_FILES += vmlinux System.map \
1163	.tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1164
1165	# Directories & files removed with 'make mrproper'
1166	MRPROPER_DIRS += include/config usr/include include/generated \
1167	arch/*/include/generated
1168	MRPROPER_FILES += .config .config.old .version .old_version \
1169	include/linux/version.h \
1170	Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1171
1172	# clean - Delete most, but leave enough to build external modules
1173	#
1174	clean: rm-dirs := $(CLEAN_DIRS)
1175	clean: rm-files := $(CLEAN_FILES)
1176	clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation)
1177
1178	PHONY += $(clean-dirs) clean archclean
1179	$(clean-dirs):
1180	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1181
1182	clean: archclean
1183
1184	# mrproper - Delete all generated files, including .config
1185	#
1186	mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1187	mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1188	mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1189
1190	PHONY += $(mrproper-dirs) mrproper archmrproper
1191	$(mrproper-dirs):
1192	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1193
1194	mrproper: clean archmrproper $(mrproper-dirs)
1195	$(call cmd,rmdirs)
1196	$(call cmd,rmfiles)
1197
1198	# distclean
1199	#
1200	PHONY += distclean
1201
1202	distclean: mrproper
1203	@find $(srctree) $(RCS_FIND_IGNORE) \
1204	\( -name '.orig' -o -name '.rej' -o -name '*~' \
1205	-o -name '.bak' -o -name '##' -o -name '.*.orig' \
1206	-o -name '.*.rej' \
1207	-o -name '%' -o -name '..cmd' -o -name 'core' \) \
1208	-type f -print \| xargs rm -f
1209
1210
1211	# Packaging of the kernel to various formats
1212	# ---------------------------------------------------------------------------
1213	# rpm target kept for backward compatibility
1214	package-dir := $(srctree)/scripts/package
1215
1216	%src-pkg: FORCE
1217	$(Q)$(MAKE) $(build)=$(package-dir) $@
1218	%pkg: include/config/kernel.release FORCE
1219	$(Q)$(MAKE) $(build)=$(package-dir) $@
1220	rpm: include/config/kernel.release FORCE
1221	$(Q)$(MAKE) $(build)=$(package-dir) $@
1222
1223
1224	# Brief documentation of the typical targets used
1225	# ---------------------------------------------------------------------------
1226
1227	boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1228	boards := $(notdir $(boards))
1229	board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs//_defconfig))
1230	board-dirs := $(sort $(notdir $(board-dirs:/=)))
1231
1232	help:
1233	@echo 'Cleaning targets:'
1234	@echo ' clean - Remove most generated files but keep the config and'
1235	@echo ' enough build support to build external modules'
1236	@echo ' mrproper - Remove all generated files + config + various backup files'
1237	@echo ' distclean - mrproper + remove editor backup and patch files'
1238	@echo ''
1239	@echo 'Configuration targets:'
1240	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1241	@echo ''
1242	@echo 'Other generic targets:'
1243	@echo ' all - Build all targets marked with [*]'
1244	@echo '* vmlinux - Build the bare kernel'
1245	@echo '* modules - Build all modules'
1246	@echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1247	@echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1248	@echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1249	@echo ' dir/ - Build all files in dir and below'
1250	@echo ' dir/file.[oisS] - Build specified target only'
1251	@echo ' dir/file.lst - Build specified mixed source/assembly target only'
1252	@echo ' (requires a recent binutils and recent build (System.map))'
1253	@echo ' dir/file.ko - Build module including final link'
1254	@echo ' modules_prepare - Set up for building external modules'
1255	@echo ' tags/TAGS - Generate tags file for editors'
1256	@echo ' cscope - Generate cscope index'
1257	@echo ' gtags - Generate GNU GLOBAL index'
1258	@echo ' kernelrelease - Output the release version string'
1259	@echo ' kernelversion - Output the version stored in Makefile'
1260	@echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1261	echo ' (default: $(INSTALL_HDR_PATH))'; \
1262	echo ''
1263	@echo 'Static analysers'
1264	@echo ' checkstack - Generate a list of stack hogs'
1265	@echo ' namespacecheck - Name space analysis on compiled kernel'
1266	@echo ' versioncheck - Sanity check on version.h usage'
1267	@echo ' includecheck - Check for duplicate included header files'
1268	@echo ' export_report - List the usages of all exported symbols'
1269	@echo ' headers_check - Sanity check on exported headers'
1270	@echo ' headerdep - Detect inclusion cycles in headers'
1271	@$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1272	@echo ''
1273	@echo 'Kernel packaging:'
1274	@$(MAKE) $(build)=$(package-dir) help
1275	@echo ''
1276	@echo 'Documentation targets:'
1277	@$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1278	@echo ''
1279	@echo 'Architecture specific targets ($(SRCARCH)):'
1280	@$(if $(archhelp),$(archhelp),\
1281	echo ' No architecture specific help defined for $(SRCARCH)')
1282	@echo ''
1283	@$(if $(boards), \
1284	$(foreach b, $(boards), \
1285	printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1286	echo '')
1287	@$(if $(board-dirs), \
1288	$(foreach b, $(board-dirs), \
1289	printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1290	printf " %-16s - Show all of the above\\n" help-boards; \
1291	echo '')
1292
1293	@echo ' make V=0\|1 [targets] 0 => quiet build (default), 1 => verbose build'
1294	@echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1295	@echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1296	@echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1297	@echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1298	@echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1299	@echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1300	@echo ' 1: warnings which may be relevant and do not occur too often'
1301	@echo ' 2: warnings which occur quite often but may still be relevant'
1302	@echo ' 3: more obscure warnings, can most likely be ignored'
1303	@echo ' Multiple levels can be combined with W=12 or W=123'
1304	@echo ''
1305	@echo 'Execute "make" or "make all" to build all targets marked with [*] '
1306	@echo 'For further info see the ./README file'
1307
1308
1309	help-board-dirs := $(addprefix help-,$(board-dirs))
1310
1311	help-boards: $(help-board-dirs)
1312
1313	boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$/_defconfig))
1314
1315	$(help-board-dirs): help-%:
1316	@echo 'Architecture specific targets ($(SRCARCH) $*):'
1317	@$(if $(boards-per-dir), \
1318	$(foreach b, $(boards-per-dir), \
1319	printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1320	echo '')
1321
1322
1323	# Documentation targets
1324	# ---------------------------------------------------------------------------
1325	%docs: scripts_basic FORCE
1326	$(Q)$(MAKE) $(build)=scripts build_docproc
1327	$(Q)$(MAKE) $(build)=Documentation/DocBook $@
1328
1329	else # KBUILD_EXTMOD
1330
1331	###
1332	# External module support.
1333	# When building external modules the kernel used as basis is considered
1334	# read-only, and no consistency checks are made and the make
1335	# system is not used on the basis kernel. If updates are required
1336	# in the basis kernel ordinary make commands (without M=...) must
1337	# be used.
1338	#
1339	# The following are the only valid targets when building external
1340	# modules.
1341	# make M=dir clean Delete all automatically generated files
1342	# make M=dir modules Make all modules in specified dir
1343	# make M=dir Same as 'make M=dir modules'
1344	# make M=dir modules_install
1345	# Install the modules built in the module directory
1346	# Assumes install directory is already created
1347
1348	# We are always building modules
1349	KBUILD_MODULES := 1
1350	PHONY += crmodverdir
1351	crmodverdir:
1352	$(cmd_crmodverdir)
1353
1354	PHONY += $(objtree)/Module.symvers
1355	$(objtree)/Module.symvers:
1356	@test -e $(objtree)/Module.symvers \|\| ( \
1357	echo; \
1358	echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1359	echo " is missing; modules will have no dependencies and modversions."; \
1360	echo )
1361
1362	module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1363	PHONY += $(module-dirs) modules
1364	$(module-dirs): crmodverdir $(objtree)/Module.symvers
1365	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1366
1367	modules: $(module-dirs)
1368	@$(kecho) ' Building modules, stage 2.';
1369	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1370
1371	PHONY += modules_install
1372	modules_install: _emodinst_ _emodinst_post
1373
1374	install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1375	PHONY += _emodinst_
1376	_emodinst_:
1377	$(Q)mkdir -p $(MODLIB)/$(install-dir)
1378	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1379
1380	PHONY += _emodinst_post
1381	_emodinst_post: _emodinst_
1382	$(call cmd,depmod)
1383
1384	clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1385
1386	PHONY += $(clean-dirs) clean
1387	$(clean-dirs):
1388	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1389
1390	clean: rm-dirs := $(MODVERDIR)
1391	clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1392
1393	help:
1394	@echo ' Building external modules.'
1395	@echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1396	@echo ''
1397	@echo ' modules - default target, build the module(s)'
1398	@echo ' modules_install - install the module'
1399	@echo ' clean - remove generated files in module directory only'
1400	@echo ''
1401
1402	# Dummies...
1403	PHONY += prepare scripts
1404	prepare: ;
1405	scripts: ;
1406	endif # KBUILD_EXTMOD
1407
1408	clean: $(clean-dirs)
1409	$(call cmd,rmdirs)
1410	$(call cmd,rmfiles)
1411	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1412	\( -name '.[oa]' -o -name '.ko' -o -name '.*.cmd' \
1413	-o -name '..d' -o -name '..tmp' -o -name '*.mod.c' \
1414	-o -name '*.symtypes' -o -name 'modules.order' \
1415	-o -name modules.builtin -o -name '.tmp_.o.' \
1416	-o -name '*.gcno' \) -type f -print \| xargs rm -f
1417
1418	# Generate tags for editors
1419	# ---------------------------------------------------------------------------
1420	quiet_cmd_tags = GEN $@
1421	cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1422
1423	tags TAGS cscope gtags: FORCE
1424	$(call cmd,tags)
1425
1426	# Scripts to check various things for consistency
1427	# ---------------------------------------------------------------------------
1428
1429	PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1430
1431	includecheck:
1432	find $(srctree)/* $(RCS_FIND_IGNORE) \
1433	-name '*.[hcS]' -type f -print \| sort \
1434	\| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1435
1436	versioncheck:
1437	find $(srctree)/* $(RCS_FIND_IGNORE) \
1438	-name '*.[hcS]' -type f -print \| sort \
1439	\| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1440
1441	coccicheck:
1442	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1443
1444	namespacecheck:
1445	$(PERL) $(srctree)/scripts/namespace.pl
1446
1447	export_report:
1448	$(PERL) $(srctree)/scripts/export_report.pl
1449
1450	endif #ifeq ($(config-targets),1)
1451	endif #ifeq ($(mixed-targets),1)
1452
1453	PHONY += checkstack kernelrelease kernelversion
1454
1455	# UML needs a little special treatment here. It wants to use the host
1456	# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1457	# else wants $(ARCH), including people doing cross-builds, which means
1458	# that $(SUBARCH) doesn't work here.
1459	ifeq ($(ARCH), um)
1460	CHECKSTACK_ARCH := $(SUBARCH)
1461	else
1462	CHECKSTACK_ARCH := $(ARCH)
1463	endif
1464	checkstack:
1465	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') \| \
1466	$(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1467
1468	kernelrelease:
1469	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1470
1471	kernelversion:
1472	@echo $(KERNELVERSION)
1473
1474	# Single targets
1475	# ---------------------------------------------------------------------------
1476	# Single targets are compatible with:
1477	# - build with mixed source and output
1478	# - build with separate output dir 'make O=...'
1479	# - external modules
1480	#
1481	# target-dir => where to store outputfile
1482	# build-dir => directory in kernel source tree to use
1483
1484	ifeq ($(KBUILD_EXTMOD),)
1485	build-dir = $(patsubst %/,%,$(dir $@))
1486	target-dir = $(dir $@)
1487	else
1488	zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1489	build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1490	target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1491	endif
1492
1493	%.s: %.c prepare scripts FORCE
1494	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1495	%.i: %.c prepare scripts FORCE
1496	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1497	%.o: %.c prepare scripts FORCE
1498	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1499	%.lst: %.c prepare scripts FORCE
1500	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1501	%.s: %.S prepare scripts FORCE
1502	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1503	%.o: %.S prepare scripts FORCE
1504	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1505	%.symtypes: %.c prepare scripts FORCE
1506	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1507
1508	# Modules
1509	/: prepare scripts FORCE
1510	$(cmd_crmodverdir)
1511	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1512	$(build)=$(build-dir)
1513	%/: prepare scripts FORCE
1514	$(cmd_crmodverdir)
1515	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1516	$(build)=$(build-dir)
1517	%.ko: prepare scripts FORCE
1518	$(cmd_crmodverdir)
1519	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1520	$(build)=$(build-dir) $(@:.ko=.o)
1521	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1522
1523	# FIXME Should go into a make.lib or something
1524	# ===========================================================================
1525
1526	quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1527	cmd_rmdirs = rm -rf $(rm-dirs)
1528
1529	quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1530	cmd_rmfiles = rm -f $(rm-files)
1531
1532	# Run depmod only if we have System.map and depmod is executable
1533	quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1534	cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1535	$(KERNELRELEASE)
1536
1537	# Create temporary dir for module support files
1538	# clean it up only when building all modules
1539	cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1540	$(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1541
1542	a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1543	$(KBUILD_AFLAGS_KERNEL) \
1544	$(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1545	$(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1546
1547	quiet_cmd_as_o_S = AS $@
1548	cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1549
1550	# read all saved command lines
1551
1552	targets := $(wildcard $(sort $(targets)))
1553	cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1554
1555	ifneq ($(cmd_files),)
1556	$(cmd_files): ; # Do not try to update included dependency files
1557	include $(cmd_files)
1558	endif
1559
1560	# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1561	# Usage:
1562	# $(Q)$(MAKE) $(clean)=dir
1563	clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1564
1565	endif # skip-makefile
1566
1567	PHONY += FORCE
1568	FORCE:
1569
1570	# Declare the contents of the .PHONY variable as phony. We keep that
1571	# information in a variable so we can use it in if_changed and friends.
1572	.PHONY: $(PHONY)

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