xref: /openbmc/linux/Makefile (revision cd5d5810)
1VERSION = 3
2PATCHLEVEL = 12
3SUBLEVEL = 0
4EXTRAVERSION = -rc7
5NAME = One Giant Leap for Frogkind
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 ...";
17MAKEFLAGS += -rR --no-print-directory
18
19# Avoid funny character set dependencies
20unexport LC_ALL
21LC_COLLATE=C
22LC_NUMERIC=C
23export 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
44ifeq ("$(origin V)", "command line")
45  KBUILD_VERBOSE = $(V)
46endif
47ifndef KBUILD_VERBOSE
48  KBUILD_VERBOSE = 0
49endif
50
51# Call a source code checker (by default, "sparse") as part of the
52# C compilation.
53#
54# Use 'make C=1' to enable checking of only re-compiled files.
55# Use 'make C=2' to enable checking of *all* source files, regardless
56# of whether they are re-compiled or not.
57#
58# See the file "Documentation/sparse.txt" for more details, including
59# where to get the "sparse" utility.
60
61ifeq ("$(origin C)", "command line")
62  KBUILD_CHECKSRC = $(C)
63endif
64ifndef KBUILD_CHECKSRC
65  KBUILD_CHECKSRC = 0
66endif
67
68# Use make M=dir to specify directory of external module to build
69# Old syntax make ... SUBDIRS=$PWD is still supported
70# Setting the environment variable KBUILD_EXTMOD take precedence
71ifdef SUBDIRS
72  KBUILD_EXTMOD ?= $(SUBDIRS)
73endif
74
75ifeq ("$(origin M)", "command line")
76  KBUILD_EXTMOD := $(M)
77endif
78
79# kbuild supports saving output files in a separate directory.
80# To locate output files in a separate directory two syntaxes are supported.
81# In both cases the working directory must be the root of the kernel src.
82# 1) O=
83# Use "make O=dir/to/store/output/files/"
84#
85# 2) Set KBUILD_OUTPUT
86# Set the environment variable KBUILD_OUTPUT to point to the directory
87# where the output files shall be placed.
88# export KBUILD_OUTPUT=dir/to/store/output/files/
89# make
90#
91# The O= assignment takes precedence over the KBUILD_OUTPUT environment
92# variable.
93
94
95# KBUILD_SRC is set on invocation of make in OBJ directory
96# KBUILD_SRC is not intended to be used by the regular user (for now)
97ifeq ($(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?
101ifeq ("$(origin O)", "command line")
102  KBUILD_OUTPUT := $(O)
103endif
104
105ifeq ("$(origin W)", "command line")
106  export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
107endif
108
109# That's our default target when none is given on the command line
110PHONY := _all
111_all:
112
113# Cancel implicit rules on top Makefile
114$(CURDIR)/Makefile Makefile: ;
115
116ifneq ($(KBUILD_OUTPUT),)
117# Invoke a second make in the output directory, passing relevant variables
118# check that the output directory actually exists
119saved-output := $(KBUILD_OUTPUT)
120KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
121$(if $(KBUILD_OUTPUT),, \
122     $(error output directory "$(saved-output)" does not exist))
123
124PHONY += $(MAKECMDGOALS) sub-make
125
126$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
127	@:
128
129sub-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
136skip-makefile := 1
137endif # ifneq ($(KBUILD_OUTPUT),)
138endif # ifeq ($(KBUILD_SRC),)
139
140# We process the rest of the Makefile if this is the final invocation of make
141ifeq ($(skip-makefile),)
142
143# If building an external module we do not care about the all: rule
144# but instead _all depend on modules
145PHONY += all
146ifeq ($(KBUILD_EXTMOD),)
147_all: all
148else
149_all: modules
150endif
151
152srctree		:= $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
153objtree		:= $(CURDIR)
154src		:= $(srctree)
155obj		:= $(objtree)
156
157VPATH		:= $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
158
159export 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
168SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
169				  -e s/sun4u/sparc64/ \
170				  -e s/arm.*/arm/ -e s/sa110/arm/ \
171				  -e s/s390x/s390/ -e s/parisc64/parisc/ \
172				  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
173				  -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
174
175# Cross compiling and selecting different set of gcc/bin-utils
176# ---------------------------------------------------------------------------
177#
178# When performing cross compilation for other architectures ARCH shall be set
179# to the target architecture. (See arch/* for the possibilities).
180# ARCH can be set during invocation of make:
181# make ARCH=ia64
182# Another way is to have ARCH set in the environment.
183# The default ARCH is the host where make is executed.
184
185# CROSS_COMPILE specify the prefix used for all executables used
186# during compilation. Only gcc and related bin-utils executables
187# are prefixed with $(CROSS_COMPILE).
188# CROSS_COMPILE can be set on the command line
189# make CROSS_COMPILE=ia64-linux-
190# Alternatively CROSS_COMPILE can be set in the environment.
191# A third alternative is to store a setting in .config so that plain
192# "make" in the configured kernel build directory always uses that.
193# Default value for CROSS_COMPILE is not to prefix executables
194# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
195ARCH		?= $(SUBARCH)
196CROSS_COMPILE	?= $(CONFIG_CROSS_COMPILE:"%"=%)
197
198# Architecture as present in compile.h
199UTS_MACHINE 	:= $(ARCH)
200SRCARCH 	:= $(ARCH)
201
202# Additional ARCH settings for x86
203ifeq ($(ARCH),i386)
204        SRCARCH := x86
205endif
206ifeq ($(ARCH),x86_64)
207        SRCARCH := x86
208endif
209
210# Additional ARCH settings for sparc
211ifeq ($(ARCH),sparc32)
212       SRCARCH := sparc
213endif
214ifeq ($(ARCH),sparc64)
215       SRCARCH := sparc
216endif
217
218# Additional ARCH settings for sh
219ifeq ($(ARCH),sh64)
220       SRCARCH := sh
221endif
222
223# Additional ARCH settings for tile
224ifeq ($(ARCH),tilepro)
225       SRCARCH := tile
226endif
227ifeq ($(ARCH),tilegx)
228       SRCARCH := tile
229endif
230
231# Where to locate arch specific headers
232hdr-arch  := $(SRCARCH)
233
234KCONFIG_CONFIG	?= .config
235export KCONFIG_CONFIG
236
237# SHELL used by kbuild
238CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
239	  else if [ -x /bin/bash ]; then echo /bin/bash; \
240	  else echo sh; fi ; fi)
241
242HOSTCC       = gcc
243HOSTCXX      = g++
244HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
245HOSTCXXFLAGS = -O2
246
247# Decide whether to build built-in, modular, or both.
248# Normally, just do built-in.
249
250KBUILD_MODULES :=
251KBUILD_BUILTIN := 1
252
253#	If we have only "make modules", don't compile built-in objects.
254#	When we're building modules with modversions, we need to consider
255#	the built-in objects during the descend as well, in order to
256#	make sure the checksums are up to date before we record them.
257
258ifeq ($(MAKECMDGOALS),modules)
259  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
260endif
261
262#	If we have "make <whatever> modules", compile modules
263#	in addition to whatever we do anyway.
264#	Just "make" or "make all" shall build modules as well
265
266ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
267  KBUILD_MODULES := 1
268endif
269
270ifeq ($(MAKECMDGOALS),)
271  KBUILD_MODULES := 1
272endif
273
274export KBUILD_MODULES KBUILD_BUILTIN
275export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
276
277# Beautify output
278# ---------------------------------------------------------------------------
279#
280# Normally, we echo the whole command before executing it. By making
281# that echo $($(quiet)$(cmd)), we now have the possibility to set
282# $(quiet) to choose other forms of output instead, e.g.
283#
284#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
285#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
286#
287# If $(quiet) is empty, the whole command will be printed.
288# If it is set to "quiet_", only the short version will be printed.
289# If it is set to "silent_", nothing will be printed at all, since
290# the variable $(silent_cmd_cc_o_c) doesn't exist.
291#
292# A simple variant is to prefix commands with $(Q) - that's useful
293# for commands that shall be hidden in non-verbose mode.
294#
295#	$(Q)ln $@ :<
296#
297# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
298# If KBUILD_VERBOSE equals 1 then the above command is displayed.
299
300ifeq ($(KBUILD_VERBOSE),1)
301  quiet =
302  Q =
303else
304  quiet=quiet_
305  Q = @
306endif
307
308# If the user is running make -s (silent mode), suppress echoing of
309# commands
310
311ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
312  quiet=silent_
313endif
314
315export quiet Q KBUILD_VERBOSE
316
317
318# Look for make include files relative to root of kernel src
319MAKEFLAGS += --include-dir=$(srctree)
320
321# We need some generic definitions (do not try to remake the file).
322$(srctree)/scripts/Kbuild.include: ;
323include $(srctree)/scripts/Kbuild.include
324
325# Make variables (CC, etc...)
326
327AS		= $(CROSS_COMPILE)as
328LD		= $(CROSS_COMPILE)ld
329CC		= $(CROSS_COMPILE)gcc
330CPP		= $(CC) -E
331AR		= $(CROSS_COMPILE)ar
332NM		= $(CROSS_COMPILE)nm
333STRIP		= $(CROSS_COMPILE)strip
334OBJCOPY		= $(CROSS_COMPILE)objcopy
335OBJDUMP		= $(CROSS_COMPILE)objdump
336AWK		= awk
337GENKSYMS	= scripts/genksyms/genksyms
338INSTALLKERNEL  := installkernel
339DEPMOD		= /sbin/depmod
340PERL		= perl
341CHECK		= sparse
342
343CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
344		  -Wbitwise -Wno-return-void $(CF)
345CFLAGS_MODULE   =
346AFLAGS_MODULE   =
347LDFLAGS_MODULE  =
348CFLAGS_KERNEL	=
349AFLAGS_KERNEL	=
350CFLAGS_GCOV	= -fprofile-arcs -ftest-coverage
351
352
353# Use USERINCLUDE when you must reference the UAPI directories only.
354USERINCLUDE    := \
355		-I$(srctree)/arch/$(hdr-arch)/include/uapi \
356		-Iarch/$(hdr-arch)/include/generated/uapi \
357		-I$(srctree)/include/uapi \
358		-Iinclude/generated/uapi \
359                -include $(srctree)/include/linux/kconfig.h
360
361# Use LINUXINCLUDE when you must reference the include/ directory.
362# Needed to be compatible with the O= option
363LINUXINCLUDE    := \
364		-I$(srctree)/arch/$(hdr-arch)/include \
365		-Iarch/$(hdr-arch)/include/generated \
366		$(if $(KBUILD_SRC), -I$(srctree)/include) \
367		-Iinclude \
368		$(USERINCLUDE)
369
370KBUILD_CPPFLAGS := -D__KERNEL__
371
372KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
373		   -fno-strict-aliasing -fno-common \
374		   -Werror-implicit-function-declaration \
375		   -Wno-format-security \
376		   -fno-delete-null-pointer-checks
377KBUILD_AFLAGS_KERNEL :=
378KBUILD_CFLAGS_KERNEL :=
379KBUILD_AFLAGS   := -D__ASSEMBLY__
380KBUILD_AFLAGS_MODULE  := -DMODULE
381KBUILD_CFLAGS_MODULE  := -DMODULE
382KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
383
384# Read KERNELRELEASE from include/config/kernel.release (if it exists)
385KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
386KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
387
388export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
389export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
390export CPP AR NM STRIP OBJCOPY OBJDUMP
391export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
392export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
393
394export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
395export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
396export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
397export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
398export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
399export KBUILD_ARFLAGS
400
401# When compiling out-of-tree modules, put MODVERDIR in the module
402# tree rather than in the kernel tree. The kernel tree might
403# even be read-only.
404export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
405
406# Files to ignore in find ... statements
407
408RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \
409		   -o -name .pc -o -name .hg -o -name .git \) -prune -o
410export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
411			 --exclude CVS --exclude .pc --exclude .hg --exclude .git
412
413# ===========================================================================
414# Rules shared between *config targets and build targets
415
416# Basic helpers built in scripts/
417PHONY += scripts_basic
418scripts_basic:
419	$(Q)$(MAKE) $(build)=scripts/basic
420	$(Q)rm -f .tmp_quiet_recordmcount
421
422# To avoid any implicit rule to kick in, define an empty command.
423scripts/basic/%: scripts_basic ;
424
425PHONY += outputmakefile
426# outputmakefile generates a Makefile in the output directory, if using a
427# separate output directory. This allows convenient use of make in the
428# output directory.
429outputmakefile:
430ifneq ($(KBUILD_SRC),)
431	$(Q)ln -fsn $(srctree) source
432	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
433	    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
434endif
435
436# Support for using generic headers in asm-generic
437PHONY += asm-generic
438asm-generic:
439	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
440	            src=asm obj=arch/$(SRCARCH)/include/generated/asm
441	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
442	            src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
443
444# To make sure we do not include .config for any of the *config targets
445# catch them early, and hand them over to scripts/kconfig/Makefile
446# It is allowed to specify more targets when calling make, including
447# mixing *config targets and build targets.
448# For example 'make oldconfig all'.
449# Detect when mixed targets is specified, and make a second invocation
450# of make so .config is not included in this case either (for *config).
451
452version_h := include/generated/uapi/linux/version.h
453
454no-dot-config-targets := clean mrproper distclean \
455			 cscope gtags TAGS tags help %docs check% coccicheck \
456			 $(version_h) headers_% archheaders archscripts \
457			 kernelversion %src-pkg
458
459config-targets := 0
460mixed-targets  := 0
461dot-config     := 1
462
463ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
464	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
465		dot-config := 0
466	endif
467endif
468
469ifeq ($(KBUILD_EXTMOD),)
470        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
471                config-targets := 1
472                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
473                        mixed-targets := 1
474                endif
475        endif
476endif
477
478ifeq ($(mixed-targets),1)
479# ===========================================================================
480# We're called with mixed targets (*config and build targets).
481# Handle them one by one.
482
483%:: FORCE
484	$(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
485
486else
487ifeq ($(config-targets),1)
488# ===========================================================================
489# *config targets only - make sure prerequisites are updated, and descend
490# in scripts/kconfig to make the *config target
491
492# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
493# KBUILD_DEFCONFIG may point out an alternative default configuration
494# used for 'make defconfig'
495include $(srctree)/arch/$(SRCARCH)/Makefile
496export KBUILD_DEFCONFIG KBUILD_KCONFIG
497
498config: scripts_basic outputmakefile FORCE
499	$(Q)mkdir -p include/linux include/config
500	$(Q)$(MAKE) $(build)=scripts/kconfig $@
501
502%config: scripts_basic outputmakefile FORCE
503	$(Q)mkdir -p include/linux include/config
504	$(Q)$(MAKE) $(build)=scripts/kconfig $@
505
506else
507# ===========================================================================
508# Build targets only - this includes vmlinux, arch specific targets, clean
509# targets and others. In general all targets except *config targets.
510
511ifeq ($(KBUILD_EXTMOD),)
512# Additional helpers built in scripts/
513# Carefully list dependencies so we do not try to build scripts twice
514# in parallel
515PHONY += scripts
516scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
517	 asm-generic
518	$(Q)$(MAKE) $(build)=$(@)
519
520# Objects we will link into vmlinux / subdirs we need to visit
521init-y		:= init/
522drivers-y	:= drivers/ sound/ firmware/
523net-y		:= net/
524libs-y		:= lib/
525core-y		:= usr/
526endif # KBUILD_EXTMOD
527
528ifeq ($(dot-config),1)
529# Read in config
530-include include/config/auto.conf
531
532ifeq ($(KBUILD_EXTMOD),)
533# Read in dependencies to all Kconfig* files, make sure to run
534# oldconfig if changes are detected.
535-include include/config/auto.conf.cmd
536
537# To avoid any implicit rule to kick in, define an empty command
538$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
539
540# If .config is newer than include/config/auto.conf, someone tinkered
541# with it and forgot to run make oldconfig.
542# if auto.conf.cmd is missing then we are probably in a cleaned tree so
543# we execute the config step to be sure to catch updated Kconfig files
544include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
545	$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
546else
547# external modules needs include/generated/autoconf.h and include/config/auto.conf
548# but do not care if they are up-to-date. Use auto.conf to trigger the test
549PHONY += include/config/auto.conf
550
551include/config/auto.conf:
552	$(Q)test -e include/generated/autoconf.h -a -e $@ || (		\
553	echo >&2;							\
554	echo >&2 "  ERROR: Kernel configuration is invalid.";		\
555	echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
556	echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";	\
557	echo >&2 ;							\
558	/bin/false)
559
560endif # KBUILD_EXTMOD
561
562else
563# Dummy target needed, because used as prerequisite
564include/config/auto.conf: ;
565endif # $(dot-config)
566
567# The all: target is the default when no target is given on the
568# command line.
569# This allow a user to issue only 'make' to build a kernel including modules
570# Defaults to vmlinux, but the arch makefile usually adds further targets
571all: vmlinux
572
573ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
574KBUILD_CFLAGS	+= -Os $(call cc-disable-warning,maybe-uninitialized,)
575else
576KBUILD_CFLAGS	+= -O2
577endif
578
579include $(srctree)/arch/$(SRCARCH)/Makefile
580
581ifdef CONFIG_READABLE_ASM
582# Disable optimizations that make assembler listings hard to read.
583# reorder blocks reorders the control in the function
584# ipa clone creates specialized cloned functions
585# partial inlining inlines only parts of functions
586KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
587                 $(call cc-option,-fno-ipa-cp-clone,) \
588                 $(call cc-option,-fno-partial-inlining)
589endif
590
591ifneq ($(CONFIG_FRAME_WARN),0)
592KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
593endif
594
595# Force gcc to behave correct even for buggy distributions
596ifndef CONFIG_CC_STACKPROTECTOR
597KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
598endif
599
600# This warning generated too much noise in a regular build.
601# Use make W=1 to enable this warning (see scripts/Makefile.build)
602KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
603
604ifdef CONFIG_FRAME_POINTER
605KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
606else
607# Some targets (ARM with Thumb2, for example), can't be built with frame
608# pointers.  For those, we don't have FUNCTION_TRACER automatically
609# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
610# incompatible with -fomit-frame-pointer with current GCC, so we don't use
611# -fomit-frame-pointer with FUNCTION_TRACER.
612ifndef CONFIG_FUNCTION_TRACER
613KBUILD_CFLAGS	+= -fomit-frame-pointer
614endif
615endif
616
617ifdef CONFIG_DEBUG_INFO
618KBUILD_CFLAGS	+= -g
619KBUILD_AFLAGS	+= -gdwarf-2
620endif
621
622ifdef CONFIG_DEBUG_INFO_REDUCED
623KBUILD_CFLAGS 	+= $(call cc-option, -femit-struct-debug-baseonly) \
624		   $(call cc-option,-fno-var-tracking)
625endif
626
627ifdef CONFIG_FUNCTION_TRACER
628ifdef CONFIG_HAVE_FENTRY
629CC_USING_FENTRY	:= $(call cc-option, -mfentry -DCC_USING_FENTRY)
630endif
631KBUILD_CFLAGS	+= -pg $(CC_USING_FENTRY)
632KBUILD_AFLAGS	+= $(CC_USING_FENTRY)
633ifdef CONFIG_DYNAMIC_FTRACE
634	ifdef CONFIG_HAVE_C_RECORDMCOUNT
635		BUILD_C_RECORDMCOUNT := y
636		export BUILD_C_RECORDMCOUNT
637	endif
638endif
639endif
640
641# We trigger additional mismatches with less inlining
642ifdef CONFIG_DEBUG_SECTION_MISMATCH
643KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
644endif
645
646# arch Makefile may override CC so keep this after arch Makefile is included
647NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
648CHECKFLAGS     += $(NOSTDINC_FLAGS)
649
650# warn about C99 declaration after statement
651KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
652
653# disable pointer signed / unsigned warnings in gcc 4.0
654KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
655
656# disable invalid "can't wrap" optimizations for signed / pointers
657KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
658
659# conserve stack if available
660KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
661
662# use the deterministic mode of AR if available
663KBUILD_ARFLAGS := $(call ar-option,D)
664
665# check for 'asm goto'
666ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
667	KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
668endif
669
670# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
671KBUILD_CPPFLAGS += $(KCPPFLAGS)
672KBUILD_AFLAGS += $(KAFLAGS)
673KBUILD_CFLAGS += $(KCFLAGS)
674
675# Use --build-id when available.
676LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
677			      $(call cc-ldoption, -Wl$(comma)--build-id,))
678KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
679LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
680
681ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
682LDFLAGS_vmlinux	+= $(call ld-option, -X,)
683endif
684
685# Default kernel image to build when no specific target is given.
686# KBUILD_IMAGE may be overruled on the command line or
687# set in the environment
688# Also any assignments in arch/$(ARCH)/Makefile take precedence over
689# this default value
690export KBUILD_IMAGE ?= vmlinux
691
692#
693# INSTALL_PATH specifies where to place the updated kernel and system map
694# images. Default is /boot, but you can set it to other values
695export	INSTALL_PATH ?= /boot
696
697#
698# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
699# relocations required by build roots.  This is not defined in the
700# makefile but the argument can be passed to make if needed.
701#
702
703MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
704export MODLIB
705
706#
707#  INSTALL_MOD_STRIP, if defined, will cause modules to be
708#  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
709#  the default option --strip-debug will be used.  Otherwise,
710#  INSTALL_MOD_STRIP value will be used as the options to the strip command.
711
712ifdef INSTALL_MOD_STRIP
713ifeq ($(INSTALL_MOD_STRIP),1)
714mod_strip_cmd = $(STRIP) --strip-debug
715else
716mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
717endif # INSTALL_MOD_STRIP=1
718else
719mod_strip_cmd = true
720endif # INSTALL_MOD_STRIP
721export mod_strip_cmd
722
723
724ifdef CONFIG_MODULE_SIG_ALL
725MODSECKEY = ./signing_key.priv
726MODPUBKEY = ./signing_key.x509
727export MODPUBKEY
728mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
729else
730mod_sign_cmd = true
731endif
732export mod_sign_cmd
733
734
735ifeq ($(KBUILD_EXTMOD),)
736core-y		+= kernel/ mm/ fs/ ipc/ security/ crypto/ block/
737
738vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
739		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
740		     $(net-y) $(net-m) $(libs-y) $(libs-m)))
741
742vmlinux-alldirs	:= $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
743		     $(init-n) $(init-) \
744		     $(core-n) $(core-) $(drivers-n) $(drivers-) \
745		     $(net-n)  $(net-)  $(libs-n)    $(libs-))))
746
747init-y		:= $(patsubst %/, %/built-in.o, $(init-y))
748core-y		:= $(patsubst %/, %/built-in.o, $(core-y))
749drivers-y	:= $(patsubst %/, %/built-in.o, $(drivers-y))
750net-y		:= $(patsubst %/, %/built-in.o, $(net-y))
751libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
752libs-y2		:= $(patsubst %/, %/built-in.o, $(libs-y))
753libs-y		:= $(libs-y1) $(libs-y2)
754
755# Externally visible symbols (used by link-vmlinux.sh)
756export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
757export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
758export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
759export LDFLAGS_vmlinux
760# used by scripts/pacmage/Makefile
761export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
762
763vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
764
765# Final link of vmlinux
766      cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
767quiet_cmd_link-vmlinux = LINK    $@
768
769# Include targets which we want to
770# execute if the rest of the kernel build went well.
771vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
772ifdef CONFIG_HEADERS_CHECK
773	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
774endif
775ifdef CONFIG_SAMPLES
776	$(Q)$(MAKE) $(build)=samples
777endif
778ifdef CONFIG_BUILD_DOCSRC
779	$(Q)$(MAKE) $(build)=Documentation
780endif
781	+$(call if_changed,link-vmlinux)
782
783# The actual objects are generated when descending,
784# make sure no implicit rule kicks in
785$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
786
787# Handle descending into subdirectories listed in $(vmlinux-dirs)
788# Preset locale variables to speed up the build process. Limit locale
789# tweaks to this spot to avoid wrong language settings when running
790# make menuconfig etc.
791# Error messages still appears in the original language
792
793PHONY += $(vmlinux-dirs)
794$(vmlinux-dirs): prepare scripts
795	$(Q)$(MAKE) $(build)=$@
796
797define filechk_kernel.release
798	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
799endef
800
801# Store (new) KERNELRELEASE string in include/config/kernel.release
802include/config/kernel.release: include/config/auto.conf FORCE
803	$(call filechk,kernel.release)
804
805
806# Things we need to do before we recursively start building the kernel
807# or the modules are listed in "prepare".
808# A multi level approach is used. prepareN is processed before prepareN-1.
809# archprepare is used in arch Makefiles and when processed asm symlink,
810# version.h and scripts_basic is processed / created.
811
812# Listed in dependency order
813PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
814
815# prepare3 is used to check if we are building in a separate output directory,
816# and if so do:
817# 1) Check that make has not been executed in the kernel src $(srctree)
818prepare3: include/config/kernel.release
819ifneq ($(KBUILD_SRC),)
820	@$(kecho) '  Using $(srctree) as source for kernel'
821	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
822		echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
823		echo >&2 "  in the '$(srctree)' directory.";\
824		/bin/false; \
825	fi;
826endif
827
828# prepare2 creates a makefile if using a separate output directory
829prepare2: prepare3 outputmakefile asm-generic
830
831prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
832                   include/config/auto.conf
833	$(cmd_crmodverdir)
834
835archprepare: archheaders archscripts prepare1 scripts_basic
836
837prepare0: archprepare FORCE
838	$(Q)$(MAKE) $(build)=.
839
840# All the preparing..
841prepare: prepare0
842
843# Generate some files
844# ---------------------------------------------------------------------------
845
846# KERNELRELEASE can change from a few different places, meaning version.h
847# needs to be updated, so this check is forced on all builds
848
849uts_len := 64
850define filechk_utsrelease.h
851	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
852	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
853	  exit 1;                                                         \
854	fi;                                                               \
855	(echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
856endef
857
858define filechk_version.h
859	(echo \#define LINUX_VERSION_CODE $(shell                         \
860	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
861	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
862endef
863
864$(version_h): $(srctree)/Makefile FORCE
865	$(call filechk,version.h)
866
867include/generated/utsrelease.h: include/config/kernel.release FORCE
868	$(call filechk,utsrelease.h)
869
870PHONY += headerdep
871headerdep:
872	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
873	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
874
875# ---------------------------------------------------------------------------
876
877PHONY += depend dep
878depend dep:
879	@echo '*** Warning: make $@ is unnecessary now.'
880
881# ---------------------------------------------------------------------------
882# Firmware install
883INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
884export INSTALL_FW_PATH
885
886PHONY += firmware_install
887firmware_install: FORCE
888	@mkdir -p $(objtree)/firmware
889	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
890
891# ---------------------------------------------------------------------------
892# Kernel headers
893
894#Default location for installed headers
895export INSTALL_HDR_PATH = $(objtree)/usr
896
897hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
898
899# If we do an all arch process set dst to asm-$(hdr-arch)
900hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
901
902PHONY += archheaders
903archheaders:
904
905PHONY += archscripts
906archscripts:
907
908PHONY += __headers
909__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
910	$(Q)$(MAKE) $(build)=scripts build_unifdef
911
912PHONY += headers_install_all
913headers_install_all:
914	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
915
916PHONY += headers_install
917headers_install: __headers
918	$(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
919	  $(error Headers not exportable for the $(SRCARCH) architecture))
920	$(Q)$(MAKE) $(hdr-inst)=include/uapi
921	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
922
923PHONY += headers_check_all
924headers_check_all: headers_install_all
925	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
926
927PHONY += headers_check
928headers_check: headers_install
929	$(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
930	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
931
932# ---------------------------------------------------------------------------
933# Modules
934
935ifdef CONFIG_MODULES
936
937# By default, build modules as well
938
939all: modules
940
941#	Build modules
942#
943#	A module can be listed more than once in obj-m resulting in
944#	duplicate lines in modules.order files.  Those are removed
945#	using awk while concatenating to the final file.
946
947PHONY += modules
948modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
949	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
950	@$(kecho) '  Building modules, stage 2.';
951	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
952	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
953
954modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
955	$(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
956
957%/modules.builtin: include/config/auto.conf
958	$(Q)$(MAKE) $(modbuiltin)=$*
959
960
961# Target to prepare building external modules
962PHONY += modules_prepare
963modules_prepare: prepare scripts
964
965# Target to install modules
966PHONY += modules_install
967modules_install: _modinst_ _modinst_post
968
969PHONY += _modinst_
970_modinst_:
971	@rm -rf $(MODLIB)/kernel
972	@rm -f $(MODLIB)/source
973	@mkdir -p $(MODLIB)/kernel
974	@ln -s $(srctree) $(MODLIB)/source
975	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
976		rm -f $(MODLIB)/build ; \
977		ln -s $(objtree) $(MODLIB)/build ; \
978	fi
979	@cp -f $(objtree)/modules.order $(MODLIB)/
980	@cp -f $(objtree)/modules.builtin $(MODLIB)/
981	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
982
983# This depmod is only for convenience to give the initial
984# boot a modules.dep even before / is mounted read-write.  However the
985# boot script depmod is the master version.
986PHONY += _modinst_post
987_modinst_post: _modinst_
988	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
989	$(call cmd,depmod)
990
991ifeq ($(CONFIG_MODULE_SIG), y)
992PHONY += modules_sign
993modules_sign:
994	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
995endif
996
997else # CONFIG_MODULES
998
999# Modules not configured
1000# ---------------------------------------------------------------------------
1001
1002modules modules_install: FORCE
1003	@echo >&2
1004	@echo >&2 "The present kernel configuration has modules disabled."
1005	@echo >&2 "Type 'make config' and enable loadable module support."
1006	@echo >&2 "Then build a kernel with module support enabled."
1007	@echo >&2
1008	@exit 1
1009
1010endif # CONFIG_MODULES
1011
1012###
1013# Cleaning is done on three levels.
1014# make clean     Delete most generated files
1015#                Leave enough to build external modules
1016# make mrproper  Delete the current configuration, and all generated files
1017# make distclean Remove editor backup files, patch leftover files and the like
1018
1019# Directories & files removed with 'make clean'
1020CLEAN_DIRS  += $(MODVERDIR)
1021
1022# Directories & files removed with 'make mrproper'
1023MRPROPER_DIRS  += include/config usr/include include/generated          \
1024                  arch/*/include/generated
1025MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1026		  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1027		  signing_key.priv signing_key.x509 x509.genkey		\
1028		  extra_certificates signing_key.x509.keyid		\
1029		  signing_key.x509.signer
1030
1031# clean - Delete most, but leave enough to build external modules
1032#
1033clean: rm-dirs  := $(CLEAN_DIRS)
1034clean: rm-files := $(CLEAN_FILES)
1035clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1036
1037PHONY += $(clean-dirs) clean archclean vmlinuxclean
1038$(clean-dirs):
1039	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1040
1041vmlinuxclean:
1042	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1043
1044clean: archclean vmlinuxclean
1045
1046# mrproper - Delete all generated files, including .config
1047#
1048mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1049mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1050mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1051
1052PHONY += $(mrproper-dirs) mrproper archmrproper
1053$(mrproper-dirs):
1054	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1055
1056mrproper: clean archmrproper $(mrproper-dirs)
1057	$(call cmd,rmdirs)
1058	$(call cmd,rmfiles)
1059
1060# distclean
1061#
1062PHONY += distclean
1063
1064distclean: mrproper
1065	@find $(srctree) $(RCS_FIND_IGNORE) \
1066		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1067		-o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1068		-o -name '.*.rej' \
1069		-o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1070		-type f -print | xargs rm -f
1071
1072
1073# Packaging of the kernel to various formats
1074# ---------------------------------------------------------------------------
1075# rpm target kept for backward compatibility
1076package-dir	:= $(srctree)/scripts/package
1077
1078%src-pkg: FORCE
1079	$(Q)$(MAKE) $(build)=$(package-dir) $@
1080%pkg: include/config/kernel.release FORCE
1081	$(Q)$(MAKE) $(build)=$(package-dir) $@
1082rpm: include/config/kernel.release FORCE
1083	$(Q)$(MAKE) $(build)=$(package-dir) $@
1084
1085
1086# Brief documentation of the typical targets used
1087# ---------------------------------------------------------------------------
1088
1089boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1090boards := $(notdir $(boards))
1091board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1092board-dirs := $(sort $(notdir $(board-dirs:/=)))
1093
1094help:
1095	@echo  'Cleaning targets:'
1096	@echo  '  clean		  - Remove most generated files but keep the config and'
1097	@echo  '                    enough build support to build external modules'
1098	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1099	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
1100	@echo  ''
1101	@echo  'Configuration targets:'
1102	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1103	@echo  ''
1104	@echo  'Other generic targets:'
1105	@echo  '  all		  - Build all targets marked with [*]'
1106	@echo  '* vmlinux	  - Build the bare kernel'
1107	@echo  '* modules	  - Build all modules'
1108	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1109	@echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1110	@echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1111	@echo  '  dir/            - Build all files in dir and below'
1112	@echo  '  dir/file.[oisS] - Build specified target only'
1113	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1114	@echo  '                    (requires a recent binutils and recent build (System.map))'
1115	@echo  '  dir/file.ko     - Build module including final link'
1116	@echo  '  modules_prepare - Set up for building external modules'
1117	@echo  '  tags/TAGS	  - Generate tags file for editors'
1118	@echo  '  cscope	  - Generate cscope index'
1119	@echo  '  gtags           - Generate GNU GLOBAL index'
1120	@echo  '  kernelrelease	  - Output the release version string'
1121	@echo  '  kernelversion	  - Output the version stored in Makefile'
1122	@echo  '  image_name	  - Output the image name'
1123	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1124	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1125	 echo  ''
1126	@echo  'Static analysers'
1127	@echo  '  checkstack      - Generate a list of stack hogs'
1128	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1129	@echo  '  versioncheck    - Sanity check on version.h usage'
1130	@echo  '  includecheck    - Check for duplicate included header files'
1131	@echo  '  export_report   - List the usages of all exported symbols'
1132	@echo  '  headers_check   - Sanity check on exported headers'
1133	@echo  '  headerdep       - Detect inclusion cycles in headers'
1134	@$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1135	@echo  ''
1136	@echo  'Kernel packaging:'
1137	@$(MAKE) $(build)=$(package-dir) help
1138	@echo  ''
1139	@echo  'Documentation targets:'
1140	@$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1141	@echo  ''
1142	@echo  'Architecture specific targets ($(SRCARCH)):'
1143	@$(if $(archhelp),$(archhelp),\
1144		echo '  No architecture specific help defined for $(SRCARCH)')
1145	@echo  ''
1146	@$(if $(boards), \
1147		$(foreach b, $(boards), \
1148		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1149		echo '')
1150	@$(if $(board-dirs), \
1151		$(foreach b, $(board-dirs), \
1152		printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1153		printf "  %-16s - Show all of the above\\n" help-boards; \
1154		echo '')
1155
1156	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1157	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1158	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1159	@echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1160	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1161	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1162	@echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1163	@echo  '		1: warnings which may be relevant and do not occur too often'
1164	@echo  '		2: warnings which occur quite often but may still be relevant'
1165	@echo  '		3: more obscure warnings, can most likely be ignored'
1166	@echo  '		Multiple levels can be combined with W=12 or W=123'
1167	@echo  ''
1168	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
1169	@echo  'For further info see the ./README file'
1170
1171
1172help-board-dirs := $(addprefix help-,$(board-dirs))
1173
1174help-boards: $(help-board-dirs)
1175
1176boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1177
1178$(help-board-dirs): help-%:
1179	@echo  'Architecture specific targets ($(SRCARCH) $*):'
1180	@$(if $(boards-per-dir), \
1181		$(foreach b, $(boards-per-dir), \
1182		printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1183		echo '')
1184
1185
1186# Documentation targets
1187# ---------------------------------------------------------------------------
1188%docs: scripts_basic FORCE
1189	$(Q)$(MAKE) $(build)=scripts build_docproc
1190	$(Q)$(MAKE) $(build)=Documentation/DocBook $@
1191
1192else # KBUILD_EXTMOD
1193
1194###
1195# External module support.
1196# When building external modules the kernel used as basis is considered
1197# read-only, and no consistency checks are made and the make
1198# system is not used on the basis kernel. If updates are required
1199# in the basis kernel ordinary make commands (without M=...) must
1200# be used.
1201#
1202# The following are the only valid targets when building external
1203# modules.
1204# make M=dir clean     Delete all automatically generated files
1205# make M=dir modules   Make all modules in specified dir
1206# make M=dir	       Same as 'make M=dir modules'
1207# make M=dir modules_install
1208#                      Install the modules built in the module directory
1209#                      Assumes install directory is already created
1210
1211# We are always building modules
1212KBUILD_MODULES := 1
1213PHONY += crmodverdir
1214crmodverdir:
1215	$(cmd_crmodverdir)
1216
1217PHONY += $(objtree)/Module.symvers
1218$(objtree)/Module.symvers:
1219	@test -e $(objtree)/Module.symvers || ( \
1220	echo; \
1221	echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1222	echo "           is missing; modules will have no dependencies and modversions."; \
1223	echo )
1224
1225module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1226PHONY += $(module-dirs) modules
1227$(module-dirs): crmodverdir $(objtree)/Module.symvers
1228	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1229
1230modules: $(module-dirs)
1231	@$(kecho) '  Building modules, stage 2.';
1232	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1233
1234PHONY += modules_install
1235modules_install: _emodinst_ _emodinst_post
1236
1237install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1238PHONY += _emodinst_
1239_emodinst_:
1240	$(Q)mkdir -p $(MODLIB)/$(install-dir)
1241	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1242
1243PHONY += _emodinst_post
1244_emodinst_post: _emodinst_
1245	$(call cmd,depmod)
1246
1247clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1248
1249PHONY += $(clean-dirs) clean
1250$(clean-dirs):
1251	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1252
1253clean:	rm-dirs := $(MODVERDIR)
1254clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1255
1256help:
1257	@echo  '  Building external modules.'
1258	@echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1259	@echo  ''
1260	@echo  '  modules         - default target, build the module(s)'
1261	@echo  '  modules_install - install the module'
1262	@echo  '  clean           - remove generated files in module directory only'
1263	@echo  ''
1264
1265# Dummies...
1266PHONY += prepare scripts
1267prepare: ;
1268scripts: ;
1269endif # KBUILD_EXTMOD
1270
1271clean: $(clean-dirs)
1272	$(call cmd,rmdirs)
1273	$(call cmd,rmfiles)
1274	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1275		\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1276		-o -name '*.ko.*' \
1277		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1278		-o -name '*.symtypes' -o -name 'modules.order' \
1279		-o -name modules.builtin -o -name '.tmp_*.o.*' \
1280		-o -name '*.gcno' \) -type f -print | xargs rm -f
1281
1282# Generate tags for editors
1283# ---------------------------------------------------------------------------
1284quiet_cmd_tags = GEN     $@
1285      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1286
1287tags TAGS cscope gtags: FORCE
1288	$(call cmd,tags)
1289
1290# Scripts to check various things for consistency
1291# ---------------------------------------------------------------------------
1292
1293PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1294
1295includecheck:
1296	find $(srctree)/* $(RCS_FIND_IGNORE) \
1297		-name '*.[hcS]' -type f -print | sort \
1298		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1299
1300versioncheck:
1301	find $(srctree)/* $(RCS_FIND_IGNORE) \
1302		-name '*.[hcS]' -type f -print | sort \
1303		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1304
1305coccicheck:
1306	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1307
1308namespacecheck:
1309	$(PERL) $(srctree)/scripts/namespace.pl
1310
1311export_report:
1312	$(PERL) $(srctree)/scripts/export_report.pl
1313
1314endif #ifeq ($(config-targets),1)
1315endif #ifeq ($(mixed-targets),1)
1316
1317PHONY += checkstack kernelrelease kernelversion image_name
1318
1319# UML needs a little special treatment here.  It wants to use the host
1320# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1321# else wants $(ARCH), including people doing cross-builds, which means
1322# that $(SUBARCH) doesn't work here.
1323ifeq ($(ARCH), um)
1324CHECKSTACK_ARCH := $(SUBARCH)
1325else
1326CHECKSTACK_ARCH := $(ARCH)
1327endif
1328checkstack:
1329	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1330	$(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1331
1332kernelrelease:
1333	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1334
1335kernelversion:
1336	@echo $(KERNELVERSION)
1337
1338image_name:
1339	@echo $(KBUILD_IMAGE)
1340
1341# Clear a bunch of variables before executing the submake
1342tools/: FORCE
1343	$(Q)mkdir -p $(objtree)/tools
1344	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1345
1346tools/%: FORCE
1347	$(Q)mkdir -p $(objtree)/tools
1348	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1349
1350# Single targets
1351# ---------------------------------------------------------------------------
1352# Single targets are compatible with:
1353# - build with mixed source and output
1354# - build with separate output dir 'make O=...'
1355# - external modules
1356#
1357#  target-dir => where to store outputfile
1358#  build-dir  => directory in kernel source tree to use
1359
1360ifeq ($(KBUILD_EXTMOD),)
1361        build-dir  = $(patsubst %/,%,$(dir $@))
1362        target-dir = $(dir $@)
1363else
1364        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1365        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1366        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1367endif
1368
1369%.s: %.c prepare scripts FORCE
1370	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1371%.i: %.c prepare scripts FORCE
1372	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1373%.o: %.c prepare scripts FORCE
1374	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1375%.lst: %.c prepare scripts FORCE
1376	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1377%.s: %.S prepare scripts FORCE
1378	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1379%.o: %.S prepare scripts FORCE
1380	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1381%.symtypes: %.c prepare scripts FORCE
1382	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1383
1384# Modules
1385/: prepare scripts FORCE
1386	$(cmd_crmodverdir)
1387	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1388	$(build)=$(build-dir)
1389%/: prepare scripts FORCE
1390	$(cmd_crmodverdir)
1391	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1392	$(build)=$(build-dir)
1393%.ko: prepare scripts FORCE
1394	$(cmd_crmodverdir)
1395	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1396	$(build)=$(build-dir) $(@:.ko=.o)
1397	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1398
1399# FIXME Should go into a make.lib or something
1400# ===========================================================================
1401
1402quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1403      cmd_rmdirs = rm -rf $(rm-dirs)
1404
1405quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1406      cmd_rmfiles = rm -f $(rm-files)
1407
1408# Run depmod only if we have System.map and depmod is executable
1409quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1410      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1411                   $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1412
1413# Create temporary dir for module support files
1414# clean it up only when building all modules
1415cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1416                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1417
1418# read all saved command lines
1419
1420targets := $(wildcard $(sort $(targets)))
1421cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1422
1423ifneq ($(cmd_files),)
1424  $(cmd_files): ;	# Do not try to update included dependency files
1425  include $(cmd_files)
1426endif
1427
1428# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1429# Usage:
1430# $(Q)$(MAKE) $(clean)=dir
1431clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1432
1433endif	# skip-makefile
1434
1435PHONY += FORCE
1436FORCE:
1437
1438# Declare the contents of the .PHONY variable as phony.  We keep that
1439# information in a variable so we can use it in if_changed and friends.
1440.PHONY: $(PHONY)
1441