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

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