xref: /openbmc/linux/Makefile (revision a2fb4d78)
1VERSION = 3
2PATCHLEVEL = 14
3SUBLEVEL = 0
4EXTRAVERSION = -rc7
5NAME = Shuffling Zombie Juror
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# Avoid interference with shell env settings
26unexport GREP_OPTIONS
27
28# We are using a recursive build, so we need to do a little thinking
29# to get the ordering right.
30#
31# Most importantly: sub-Makefiles should only ever modify files in
32# their own directory. If in some directory we have a dependency on
33# a file in another dir (which doesn't happen often, but it's often
34# unavoidable when linking the built-in.o targets which finally
35# turn into vmlinux), we will call a sub make in that other dir, and
36# after that we are sure that everything which is in that other dir
37# is now up to date.
38#
39# The only cases where we need to modify files which have global
40# effects are thus separated out and done before the recursive
41# descending is started. They are now explicitly listed as the
42# prepare rule.
43
44# To put more focus on warnings, be less verbose as default
45# Use 'make V=1' to see the full commands
46
47ifeq ("$(origin V)", "command line")
48  KBUILD_VERBOSE = $(V)
49endif
50ifndef KBUILD_VERBOSE
51  KBUILD_VERBOSE = 0
52endif
53
54# Call a source code checker (by default, "sparse") as part of the
55# C compilation.
56#
57# Use 'make C=1' to enable checking of only re-compiled files.
58# Use 'make C=2' to enable checking of *all* source files, regardless
59# of whether they are re-compiled or not.
60#
61# See the file "Documentation/sparse.txt" for more details, including
62# where to get the "sparse" utility.
63
64ifeq ("$(origin C)", "command line")
65  KBUILD_CHECKSRC = $(C)
66endif
67ifndef KBUILD_CHECKSRC
68  KBUILD_CHECKSRC = 0
69endif
70
71# Use make M=dir to specify directory of external module to build
72# Old syntax make ... SUBDIRS=$PWD is still supported
73# Setting the environment variable KBUILD_EXTMOD take precedence
74ifdef SUBDIRS
75  KBUILD_EXTMOD ?= $(SUBDIRS)
76endif
77
78ifeq ("$(origin M)", "command line")
79  KBUILD_EXTMOD := $(M)
80endif
81
82# kbuild supports saving output files in a separate directory.
83# To locate output files in a separate directory two syntaxes are supported.
84# In both cases the working directory must be the root of the kernel src.
85# 1) O=
86# Use "make O=dir/to/store/output/files/"
87#
88# 2) Set KBUILD_OUTPUT
89# Set the environment variable KBUILD_OUTPUT to point to the directory
90# where the output files shall be placed.
91# export KBUILD_OUTPUT=dir/to/store/output/files/
92# make
93#
94# The O= assignment takes precedence over the KBUILD_OUTPUT environment
95# variable.
96
97
98# KBUILD_SRC is set on invocation of make in OBJ directory
99# KBUILD_SRC is not intended to be used by the regular user (for now)
100ifeq ($(KBUILD_SRC),)
101
102# OK, Make called in directory where kernel src resides
103# Do we want to locate output files in a separate directory?
104ifeq ("$(origin O)", "command line")
105  KBUILD_OUTPUT := $(O)
106endif
107
108ifeq ("$(origin W)", "command line")
109  export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
110endif
111
112# That's our default target when none is given on the command line
113PHONY := _all
114_all:
115
116# Cancel implicit rules on top Makefile
117$(CURDIR)/Makefile Makefile: ;
118
119ifneq ($(KBUILD_OUTPUT),)
120# Invoke a second make in the output directory, passing relevant variables
121# check that the output directory actually exists
122saved-output := $(KBUILD_OUTPUT)
123KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
124$(if $(KBUILD_OUTPUT),, \
125     $(error output directory "$(saved-output)" does not exist))
126
127PHONY += $(MAKECMDGOALS) sub-make
128
129$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
130	@:
131
132sub-make: FORCE
133	$(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
134	KBUILD_SRC=$(CURDIR) \
135	KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
136	$(filter-out _all sub-make,$(MAKECMDGOALS))
137
138# Leave processing to above invocation of make
139skip-makefile := 1
140endif # ifneq ($(KBUILD_OUTPUT),)
141endif # ifeq ($(KBUILD_SRC),)
142
143# We process the rest of the Makefile if this is the final invocation of make
144ifeq ($(skip-makefile),)
145
146# If building an external module we do not care about the all: rule
147# but instead _all depend on modules
148PHONY += all
149ifeq ($(KBUILD_EXTMOD),)
150_all: all
151else
152_all: modules
153endif
154
155srctree		:= $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
156objtree		:= $(CURDIR)
157src		:= $(srctree)
158obj		:= $(objtree)
159
160VPATH		:= $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
161
162export srctree objtree VPATH
163
164
165# SUBARCH tells the usermode build what the underlying arch is.  That is set
166# first, and if a usermode build is happening, the "ARCH=um" on the command
167# line overrides the setting of ARCH below.  If a native build is happening,
168# then ARCH is assigned, getting whatever value it gets normally, and
169# SUBARCH is subsequently ignored.
170
171SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
172				  -e s/sun4u/sparc64/ \
173				  -e s/arm.*/arm/ -e s/sa110/arm/ \
174				  -e s/s390x/s390/ -e s/parisc64/parisc/ \
175				  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
176				  -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
177
178# Cross compiling and selecting different set of gcc/bin-utils
179# ---------------------------------------------------------------------------
180#
181# When performing cross compilation for other architectures ARCH shall be set
182# to the target architecture. (See arch/* for the possibilities).
183# ARCH can be set during invocation of make:
184# make ARCH=ia64
185# Another way is to have ARCH set in the environment.
186# The default ARCH is the host where make is executed.
187
188# CROSS_COMPILE specify the prefix used for all executables used
189# during compilation. Only gcc and related bin-utils executables
190# are prefixed with $(CROSS_COMPILE).
191# CROSS_COMPILE can be set on the command line
192# make CROSS_COMPILE=ia64-linux-
193# Alternatively CROSS_COMPILE can be set in the environment.
194# A third alternative is to store a setting in .config so that plain
195# "make" in the configured kernel build directory always uses that.
196# Default value for CROSS_COMPILE is not to prefix executables
197# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
198ARCH		?= $(SUBARCH)
199CROSS_COMPILE	?= $(CONFIG_CROSS_COMPILE:"%"=%)
200
201# Architecture as present in compile.h
202UTS_MACHINE 	:= $(ARCH)
203SRCARCH 	:= $(ARCH)
204
205# Additional ARCH settings for x86
206ifeq ($(ARCH),i386)
207        SRCARCH := x86
208endif
209ifeq ($(ARCH),x86_64)
210        SRCARCH := x86
211endif
212
213# Additional ARCH settings for sparc
214ifeq ($(ARCH),sparc32)
215       SRCARCH := sparc
216endif
217ifeq ($(ARCH),sparc64)
218       SRCARCH := sparc
219endif
220
221# Additional ARCH settings for sh
222ifeq ($(ARCH),sh64)
223       SRCARCH := sh
224endif
225
226# Additional ARCH settings for tile
227ifeq ($(ARCH),tilepro)
228       SRCARCH := tile
229endif
230ifeq ($(ARCH),tilegx)
231       SRCARCH := tile
232endif
233
234# Where to locate arch specific headers
235hdr-arch  := $(SRCARCH)
236
237KCONFIG_CONFIG	?= .config
238export KCONFIG_CONFIG
239
240# SHELL used by kbuild
241CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
242	  else if [ -x /bin/bash ]; then echo /bin/bash; \
243	  else echo sh; fi ; fi)
244
245HOSTCC       = gcc
246HOSTCXX      = g++
247HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
248HOSTCXXFLAGS = -O2
249
250# Decide whether to build built-in, modular, or both.
251# Normally, just do built-in.
252
253KBUILD_MODULES :=
254KBUILD_BUILTIN := 1
255
256#	If we have only "make modules", don't compile built-in objects.
257#	When we're building modules with modversions, we need to consider
258#	the built-in objects during the descend as well, in order to
259#	make sure the checksums are up to date before we record them.
260
261ifeq ($(MAKECMDGOALS),modules)
262  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
263endif
264
265#	If we have "make <whatever> modules", compile modules
266#	in addition to whatever we do anyway.
267#	Just "make" or "make all" shall build modules as well
268
269ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
270  KBUILD_MODULES := 1
271endif
272
273ifeq ($(MAKECMDGOALS),)
274  KBUILD_MODULES := 1
275endif
276
277export KBUILD_MODULES KBUILD_BUILTIN
278export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
279
280# Beautify output
281# ---------------------------------------------------------------------------
282#
283# Normally, we echo the whole command before executing it. By making
284# that echo $($(quiet)$(cmd)), we now have the possibility to set
285# $(quiet) to choose other forms of output instead, e.g.
286#
287#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
288#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
289#
290# If $(quiet) is empty, the whole command will be printed.
291# If it is set to "quiet_", only the short version will be printed.
292# If it is set to "silent_", nothing will be printed at all, since
293# the variable $(silent_cmd_cc_o_c) doesn't exist.
294#
295# A simple variant is to prefix commands with $(Q) - that's useful
296# for commands that shall be hidden in non-verbose mode.
297#
298#	$(Q)ln $@ :<
299#
300# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
301# If KBUILD_VERBOSE equals 1 then the above command is displayed.
302
303ifeq ($(KBUILD_VERBOSE),1)
304  quiet =
305  Q =
306else
307  quiet=quiet_
308  Q = @
309endif
310
311# If the user is running make -s (silent mode), suppress echoing of
312# commands
313
314ifneq ($(filter 4.%,$(MAKE_VERSION)),)	# make-4
315ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
316  quiet=silent_
317endif
318else					# make-3.8x
319ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
320  quiet=silent_
321endif
322endif
323
324export quiet Q KBUILD_VERBOSE
325
326
327# Look for make include files relative to root of kernel src
328MAKEFLAGS += --include-dir=$(srctree)
329
330# We need some generic definitions (do not try to remake the file).
331$(srctree)/scripts/Kbuild.include: ;
332include $(srctree)/scripts/Kbuild.include
333
334# Make variables (CC, etc...)
335
336AS		= $(CROSS_COMPILE)as
337LD		= $(CROSS_COMPILE)ld
338CC		= $(CROSS_COMPILE)gcc
339CPP		= $(CC) -E
340AR		= $(CROSS_COMPILE)ar
341NM		= $(CROSS_COMPILE)nm
342STRIP		= $(CROSS_COMPILE)strip
343OBJCOPY		= $(CROSS_COMPILE)objcopy
344OBJDUMP		= $(CROSS_COMPILE)objdump
345AWK		= awk
346GENKSYMS	= scripts/genksyms/genksyms
347INSTALLKERNEL  := installkernel
348DEPMOD		= /sbin/depmod
349PERL		= perl
350CHECK		= sparse
351
352CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
353		  -Wbitwise -Wno-return-void $(CF)
354CFLAGS_MODULE   =
355AFLAGS_MODULE   =
356LDFLAGS_MODULE  =
357CFLAGS_KERNEL	=
358AFLAGS_KERNEL	=
359CFLAGS_GCOV	= -fprofile-arcs -ftest-coverage
360
361
362# Use USERINCLUDE when you must reference the UAPI directories only.
363USERINCLUDE    := \
364		-I$(srctree)/arch/$(hdr-arch)/include/uapi \
365		-Iarch/$(hdr-arch)/include/generated/uapi \
366		-I$(srctree)/include/uapi \
367		-Iinclude/generated/uapi \
368                -include $(srctree)/include/linux/kconfig.h
369
370# Use LINUXINCLUDE when you must reference the include/ directory.
371# Needed to be compatible with the O= option
372LINUXINCLUDE    := \
373		-I$(srctree)/arch/$(hdr-arch)/include \
374		-Iarch/$(hdr-arch)/include/generated \
375		$(if $(KBUILD_SRC), -I$(srctree)/include) \
376		-Iinclude \
377		$(USERINCLUDE)
378
379KBUILD_CPPFLAGS := -D__KERNEL__
380
381KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
382		   -fno-strict-aliasing -fno-common \
383		   -Werror-implicit-function-declaration \
384		   -Wno-format-security \
385		   -fno-delete-null-pointer-checks
386KBUILD_AFLAGS_KERNEL :=
387KBUILD_CFLAGS_KERNEL :=
388KBUILD_AFLAGS   := -D__ASSEMBLY__
389KBUILD_AFLAGS_MODULE  := -DMODULE
390KBUILD_CFLAGS_MODULE  := -DMODULE
391KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
392
393# Read KERNELRELEASE from include/config/kernel.release (if it exists)
394KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
395KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
396
397export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
398export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
399export CPP AR NM STRIP OBJCOPY OBJDUMP
400export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
401export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
402
403export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
404export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
405export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
406export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
407export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
408export KBUILD_ARFLAGS
409
410# When compiling out-of-tree modules, put MODVERDIR in the module
411# tree rather than in the kernel tree. The kernel tree might
412# even be read-only.
413export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
414
415# Files to ignore in find ... statements
416
417RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \
418		   -o -name .pc -o -name .hg -o -name .git \) -prune -o
419export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
420			 --exclude CVS --exclude .pc --exclude .hg --exclude .git
421
422# ===========================================================================
423# Rules shared between *config targets and build targets
424
425# Basic helpers built in scripts/
426PHONY += scripts_basic
427scripts_basic:
428	$(Q)$(MAKE) $(build)=scripts/basic
429	$(Q)rm -f .tmp_quiet_recordmcount
430
431# To avoid any implicit rule to kick in, define an empty command.
432scripts/basic/%: scripts_basic ;
433
434PHONY += outputmakefile
435# outputmakefile generates a Makefile in the output directory, if using a
436# separate output directory. This allows convenient use of make in the
437# output directory.
438outputmakefile:
439ifneq ($(KBUILD_SRC),)
440	$(Q)ln -fsn $(srctree) source
441	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
442	    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
443endif
444
445# Support for using generic headers in asm-generic
446PHONY += asm-generic
447asm-generic:
448	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
449	            src=asm obj=arch/$(SRCARCH)/include/generated/asm
450	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
451	            src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
452
453# To make sure we do not include .config for any of the *config targets
454# catch them early, and hand them over to scripts/kconfig/Makefile
455# It is allowed to specify more targets when calling make, including
456# mixing *config targets and build targets.
457# For example 'make oldconfig all'.
458# Detect when mixed targets is specified, and make a second invocation
459# of make so .config is not included in this case either (for *config).
460
461version_h := include/generated/uapi/linux/version.h
462
463no-dot-config-targets := clean mrproper distclean \
464			 cscope gtags TAGS tags help %docs check% coccicheck \
465			 $(version_h) headers_% archheaders archscripts \
466			 kernelversion %src-pkg
467
468config-targets := 0
469mixed-targets  := 0
470dot-config     := 1
471
472ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
473	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
474		dot-config := 0
475	endif
476endif
477
478ifeq ($(KBUILD_EXTMOD),)
479        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
480                config-targets := 1
481                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
482                        mixed-targets := 1
483                endif
484        endif
485endif
486
487ifeq ($(mixed-targets),1)
488# ===========================================================================
489# We're called with mixed targets (*config and build targets).
490# Handle them one by one.
491
492%:: FORCE
493	$(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
494
495else
496ifeq ($(config-targets),1)
497# ===========================================================================
498# *config targets only - make sure prerequisites are updated, and descend
499# in scripts/kconfig to make the *config target
500
501# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
502# KBUILD_DEFCONFIG may point out an alternative default configuration
503# used for 'make defconfig'
504include $(srctree)/arch/$(SRCARCH)/Makefile
505export KBUILD_DEFCONFIG KBUILD_KCONFIG
506
507config: scripts_basic outputmakefile FORCE
508	$(Q)mkdir -p include/linux include/config
509	$(Q)$(MAKE) $(build)=scripts/kconfig $@
510
511%config: scripts_basic outputmakefile FORCE
512	$(Q)mkdir -p include/linux include/config
513	$(Q)$(MAKE) $(build)=scripts/kconfig $@
514
515else
516# ===========================================================================
517# Build targets only - this includes vmlinux, arch specific targets, clean
518# targets and others. In general all targets except *config targets.
519
520ifeq ($(KBUILD_EXTMOD),)
521# Additional helpers built in scripts/
522# Carefully list dependencies so we do not try to build scripts twice
523# in parallel
524PHONY += scripts
525scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
526	 asm-generic
527	$(Q)$(MAKE) $(build)=$(@)
528
529# Objects we will link into vmlinux / subdirs we need to visit
530init-y		:= init/
531drivers-y	:= drivers/ sound/ firmware/
532net-y		:= net/
533libs-y		:= lib/
534core-y		:= usr/
535endif # KBUILD_EXTMOD
536
537ifeq ($(dot-config),1)
538# Read in config
539-include include/config/auto.conf
540
541ifeq ($(KBUILD_EXTMOD),)
542# Read in dependencies to all Kconfig* files, make sure to run
543# oldconfig if changes are detected.
544-include include/config/auto.conf.cmd
545
546# To avoid any implicit rule to kick in, define an empty command
547$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
548
549# If .config is newer than include/config/auto.conf, someone tinkered
550# with it and forgot to run make oldconfig.
551# if auto.conf.cmd is missing then we are probably in a cleaned tree so
552# we execute the config step to be sure to catch updated Kconfig files
553include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
554	$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
555else
556# external modules needs include/generated/autoconf.h and include/config/auto.conf
557# but do not care if they are up-to-date. Use auto.conf to trigger the test
558PHONY += include/config/auto.conf
559
560include/config/auto.conf:
561	$(Q)test -e include/generated/autoconf.h -a -e $@ || (		\
562	echo >&2;							\
563	echo >&2 "  ERROR: Kernel configuration is invalid.";		\
564	echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
565	echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";	\
566	echo >&2 ;							\
567	/bin/false)
568
569endif # KBUILD_EXTMOD
570
571else
572# Dummy target needed, because used as prerequisite
573include/config/auto.conf: ;
574endif # $(dot-config)
575
576# The all: target is the default when no target is given on the
577# command line.
578# This allow a user to issue only 'make' to build a kernel including modules
579# Defaults to vmlinux, but the arch makefile usually adds further targets
580all: vmlinux
581
582ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
583KBUILD_CFLAGS	+= -Os $(call cc-disable-warning,maybe-uninitialized,)
584else
585KBUILD_CFLAGS	+= -O2
586endif
587
588include $(srctree)/arch/$(SRCARCH)/Makefile
589
590ifdef CONFIG_READABLE_ASM
591# Disable optimizations that make assembler listings hard to read.
592# reorder blocks reorders the control in the function
593# ipa clone creates specialized cloned functions
594# partial inlining inlines only parts of functions
595KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
596                 $(call cc-option,-fno-ipa-cp-clone,) \
597                 $(call cc-option,-fno-partial-inlining)
598endif
599
600ifneq ($(CONFIG_FRAME_WARN),0)
601KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
602endif
603
604# Handle stack protector mode.
605ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
606  stackp-flag := -fstack-protector
607  ifeq ($(call cc-option, $(stackp-flag)),)
608    $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
609             -fstack-protector not supported by compiler)
610  endif
611else
612ifdef CONFIG_CC_STACKPROTECTOR_STRONG
613  stackp-flag := -fstack-protector-strong
614  ifeq ($(call cc-option, $(stackp-flag)),)
615    $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
616	      -fstack-protector-strong not supported by compiler)
617  endif
618else
619  # Force off for distro compilers that enable stack protector by default.
620  stackp-flag := $(call cc-option, -fno-stack-protector)
621endif
622endif
623KBUILD_CFLAGS += $(stackp-flag)
624
625# This warning generated too much noise in a regular build.
626# Use make W=1 to enable this warning (see scripts/Makefile.build)
627KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
628
629ifdef CONFIG_FRAME_POINTER
630KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
631else
632# Some targets (ARM with Thumb2, for example), can't be built with frame
633# pointers.  For those, we don't have FUNCTION_TRACER automatically
634# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
635# incompatible with -fomit-frame-pointer with current GCC, so we don't use
636# -fomit-frame-pointer with FUNCTION_TRACER.
637ifndef CONFIG_FUNCTION_TRACER
638KBUILD_CFLAGS	+= -fomit-frame-pointer
639endif
640endif
641
642ifdef CONFIG_DEBUG_INFO
643KBUILD_CFLAGS	+= -g
644KBUILD_AFLAGS	+= -Wa,--gdwarf-2
645endif
646
647ifdef CONFIG_DEBUG_INFO_REDUCED
648KBUILD_CFLAGS 	+= $(call cc-option, -femit-struct-debug-baseonly) \
649		   $(call cc-option,-fno-var-tracking)
650endif
651
652ifdef CONFIG_FUNCTION_TRACER
653ifdef CONFIG_HAVE_FENTRY
654CC_USING_FENTRY	:= $(call cc-option, -mfentry -DCC_USING_FENTRY)
655endif
656KBUILD_CFLAGS	+= -pg $(CC_USING_FENTRY)
657KBUILD_AFLAGS	+= $(CC_USING_FENTRY)
658ifdef CONFIG_DYNAMIC_FTRACE
659	ifdef CONFIG_HAVE_C_RECORDMCOUNT
660		BUILD_C_RECORDMCOUNT := y
661		export BUILD_C_RECORDMCOUNT
662	endif
663endif
664endif
665
666# We trigger additional mismatches with less inlining
667ifdef CONFIG_DEBUG_SECTION_MISMATCH
668KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
669endif
670
671# arch Makefile may override CC so keep this after arch Makefile is included
672NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
673CHECKFLAGS     += $(NOSTDINC_FLAGS)
674
675# warn about C99 declaration after statement
676KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
677
678# disable pointer signed / unsigned warnings in gcc 4.0
679KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
680
681# disable invalid "can't wrap" optimizations for signed / pointers
682KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
683
684# conserve stack if available
685KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
686
687# disallow errors like 'EXPORT_GPL(foo);' with missing header
688KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
689
690# require functions to have arguments in prototypes, not empty 'int foo()'
691KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
692
693# Prohibit date/time macros, which would make the build non-deterministic
694KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
695
696# use the deterministic mode of AR if available
697KBUILD_ARFLAGS := $(call ar-option,D)
698
699# check for 'asm goto'
700ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
701	KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
702endif
703
704# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
705KBUILD_CPPFLAGS += $(KCPPFLAGS)
706KBUILD_AFLAGS += $(KAFLAGS)
707KBUILD_CFLAGS += $(KCFLAGS)
708
709# Use --build-id when available.
710LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
711			      $(call cc-ldoption, -Wl$(comma)--build-id,))
712KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
713LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
714
715ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
716LDFLAGS_vmlinux	+= $(call ld-option, -X,)
717endif
718
719# Default kernel image to build when no specific target is given.
720# KBUILD_IMAGE may be overruled on the command line or
721# set in the environment
722# Also any assignments in arch/$(ARCH)/Makefile take precedence over
723# this default value
724export KBUILD_IMAGE ?= vmlinux
725
726#
727# INSTALL_PATH specifies where to place the updated kernel and system map
728# images. Default is /boot, but you can set it to other values
729export	INSTALL_PATH ?= /boot
730
731#
732# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
733# relocations required by build roots.  This is not defined in the
734# makefile but the argument can be passed to make if needed.
735#
736
737MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
738export MODLIB
739
740#
741#  INSTALL_MOD_STRIP, if defined, will cause modules to be
742#  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
743#  the default option --strip-debug will be used.  Otherwise,
744#  INSTALL_MOD_STRIP value will be used as the options to the strip command.
745
746ifdef INSTALL_MOD_STRIP
747ifeq ($(INSTALL_MOD_STRIP),1)
748mod_strip_cmd = $(STRIP) --strip-debug
749else
750mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
751endif # INSTALL_MOD_STRIP=1
752else
753mod_strip_cmd = true
754endif # INSTALL_MOD_STRIP
755export mod_strip_cmd
756
757# Select initial ramdisk compression format, default is gzip(1).
758# This shall be used by the dracut(8) tool while creating an initramfs image.
759#
760INITRD_COMPRESS-y                  := gzip
761INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
762INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
763INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
764INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
765INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
766# do not export INITRD_COMPRESS, since we didn't actually
767# choose a sane default compression above.
768# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
769
770ifdef CONFIG_MODULE_SIG_ALL
771MODSECKEY = ./signing_key.priv
772MODPUBKEY = ./signing_key.x509
773export MODPUBKEY
774mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
775else
776mod_sign_cmd = true
777endif
778export mod_sign_cmd
779
780
781ifeq ($(KBUILD_EXTMOD),)
782core-y		+= kernel/ mm/ fs/ ipc/ security/ crypto/ block/
783
784vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
785		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
786		     $(net-y) $(net-m) $(libs-y) $(libs-m)))
787
788vmlinux-alldirs	:= $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
789		     $(init-n) $(init-) \
790		     $(core-n) $(core-) $(drivers-n) $(drivers-) \
791		     $(net-n)  $(net-)  $(libs-n)    $(libs-))))
792
793init-y		:= $(patsubst %/, %/built-in.o, $(init-y))
794core-y		:= $(patsubst %/, %/built-in.o, $(core-y))
795drivers-y	:= $(patsubst %/, %/built-in.o, $(drivers-y))
796net-y		:= $(patsubst %/, %/built-in.o, $(net-y))
797libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
798libs-y2		:= $(patsubst %/, %/built-in.o, $(libs-y))
799libs-y		:= $(libs-y1) $(libs-y2)
800
801# Externally visible symbols (used by link-vmlinux.sh)
802export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
803export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
804export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
805export LDFLAGS_vmlinux
806# used by scripts/pacmage/Makefile
807export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
808
809vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
810
811# Final link of vmlinux
812      cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
813quiet_cmd_link-vmlinux = LINK    $@
814
815# Include targets which we want to
816# execute if the rest of the kernel build went well.
817vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
818ifdef CONFIG_HEADERS_CHECK
819	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
820endif
821ifdef CONFIG_SAMPLES
822	$(Q)$(MAKE) $(build)=samples
823endif
824ifdef CONFIG_BUILD_DOCSRC
825	$(Q)$(MAKE) $(build)=Documentation
826endif
827	+$(call if_changed,link-vmlinux)
828
829# The actual objects are generated when descending,
830# make sure no implicit rule kicks in
831$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
832
833# Handle descending into subdirectories listed in $(vmlinux-dirs)
834# Preset locale variables to speed up the build process. Limit locale
835# tweaks to this spot to avoid wrong language settings when running
836# make menuconfig etc.
837# Error messages still appears in the original language
838
839PHONY += $(vmlinux-dirs)
840$(vmlinux-dirs): prepare scripts
841	$(Q)$(MAKE) $(build)=$@
842
843define filechk_kernel.release
844	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
845endef
846
847# Store (new) KERNELRELEASE string in include/config/kernel.release
848include/config/kernel.release: include/config/auto.conf FORCE
849	$(call filechk,kernel.release)
850
851
852# Things we need to do before we recursively start building the kernel
853# or the modules are listed in "prepare".
854# A multi level approach is used. prepareN is processed before prepareN-1.
855# archprepare is used in arch Makefiles and when processed asm symlink,
856# version.h and scripts_basic is processed / created.
857
858# Listed in dependency order
859PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
860
861# prepare3 is used to check if we are building in a separate output directory,
862# and if so do:
863# 1) Check that make has not been executed in the kernel src $(srctree)
864prepare3: include/config/kernel.release
865ifneq ($(KBUILD_SRC),)
866	@$(kecho) '  Using $(srctree) as source for kernel'
867	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
868		echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
869		echo >&2 "  in the '$(srctree)' directory.";\
870		/bin/false; \
871	fi;
872endif
873
874# prepare2 creates a makefile if using a separate output directory
875prepare2: prepare3 outputmakefile asm-generic
876
877prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
878                   include/config/auto.conf
879	$(cmd_crmodverdir)
880
881archprepare: archheaders archscripts prepare1 scripts_basic
882
883prepare0: archprepare FORCE
884	$(Q)$(MAKE) $(build)=.
885
886# All the preparing..
887prepare: prepare0
888
889# Generate some files
890# ---------------------------------------------------------------------------
891
892# KERNELRELEASE can change from a few different places, meaning version.h
893# needs to be updated, so this check is forced on all builds
894
895uts_len := 64
896define filechk_utsrelease.h
897	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
898	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
899	  exit 1;                                                         \
900	fi;                                                               \
901	(echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
902endef
903
904define filechk_version.h
905	(echo \#define LINUX_VERSION_CODE $(shell                         \
906	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
907	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
908endef
909
910$(version_h): $(srctree)/Makefile FORCE
911	$(call filechk,version.h)
912
913include/generated/utsrelease.h: include/config/kernel.release FORCE
914	$(call filechk,utsrelease.h)
915
916PHONY += headerdep
917headerdep:
918	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
919	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
920
921# ---------------------------------------------------------------------------
922
923PHONY += depend dep
924depend dep:
925	@echo '*** Warning: make $@ is unnecessary now.'
926
927# ---------------------------------------------------------------------------
928# Firmware install
929INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
930export INSTALL_FW_PATH
931
932PHONY += firmware_install
933firmware_install: FORCE
934	@mkdir -p $(objtree)/firmware
935	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
936
937# ---------------------------------------------------------------------------
938# Kernel headers
939
940#Default location for installed headers
941export INSTALL_HDR_PATH = $(objtree)/usr
942
943hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
944
945# If we do an all arch process set dst to asm-$(hdr-arch)
946hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
947
948PHONY += archheaders
949archheaders:
950
951PHONY += archscripts
952archscripts:
953
954PHONY += __headers
955__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
956	$(Q)$(MAKE) $(build)=scripts build_unifdef
957
958PHONY += headers_install_all
959headers_install_all:
960	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
961
962PHONY += headers_install
963headers_install: __headers
964	$(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
965	  $(error Headers not exportable for the $(SRCARCH) architecture))
966	$(Q)$(MAKE) $(hdr-inst)=include/uapi
967	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
968
969PHONY += headers_check_all
970headers_check_all: headers_install_all
971	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
972
973PHONY += headers_check
974headers_check: headers_install
975	$(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
976	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
977
978# ---------------------------------------------------------------------------
979# Modules
980
981ifdef CONFIG_MODULES
982
983# By default, build modules as well
984
985all: modules
986
987#	Build modules
988#
989#	A module can be listed more than once in obj-m resulting in
990#	duplicate lines in modules.order files.  Those are removed
991#	using awk while concatenating to the final file.
992
993PHONY += modules
994modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
995	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
996	@$(kecho) '  Building modules, stage 2.';
997	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
998	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
999
1000modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1001	$(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1002
1003%/modules.builtin: include/config/auto.conf
1004	$(Q)$(MAKE) $(modbuiltin)=$*
1005
1006
1007# Target to prepare building external modules
1008PHONY += modules_prepare
1009modules_prepare: prepare scripts
1010
1011# Target to install modules
1012PHONY += modules_install
1013modules_install: _modinst_ _modinst_post
1014
1015PHONY += _modinst_
1016_modinst_:
1017	@rm -rf $(MODLIB)/kernel
1018	@rm -f $(MODLIB)/source
1019	@mkdir -p $(MODLIB)/kernel
1020	@ln -s $(srctree) $(MODLIB)/source
1021	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1022		rm -f $(MODLIB)/build ; \
1023		ln -s $(objtree) $(MODLIB)/build ; \
1024	fi
1025	@cp -f $(objtree)/modules.order $(MODLIB)/
1026	@cp -f $(objtree)/modules.builtin $(MODLIB)/
1027	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1028
1029# This depmod is only for convenience to give the initial
1030# boot a modules.dep even before / is mounted read-write.  However the
1031# boot script depmod is the master version.
1032PHONY += _modinst_post
1033_modinst_post: _modinst_
1034	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1035	$(call cmd,depmod)
1036
1037ifeq ($(CONFIG_MODULE_SIG), y)
1038PHONY += modules_sign
1039modules_sign:
1040	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1041endif
1042
1043else # CONFIG_MODULES
1044
1045# Modules not configured
1046# ---------------------------------------------------------------------------
1047
1048modules modules_install: FORCE
1049	@echo >&2
1050	@echo >&2 "The present kernel configuration has modules disabled."
1051	@echo >&2 "Type 'make config' and enable loadable module support."
1052	@echo >&2 "Then build a kernel with module support enabled."
1053	@echo >&2
1054	@exit 1
1055
1056endif # CONFIG_MODULES
1057
1058###
1059# Cleaning is done on three levels.
1060# make clean     Delete most generated files
1061#                Leave enough to build external modules
1062# make mrproper  Delete the current configuration, and all generated files
1063# make distclean Remove editor backup files, patch leftover files and the like
1064
1065# Directories & files removed with 'make clean'
1066CLEAN_DIRS  += $(MODVERDIR)
1067
1068# Directories & files removed with 'make mrproper'
1069MRPROPER_DIRS  += include/config usr/include include/generated          \
1070                  arch/*/include/generated
1071MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1072		  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1073		  signing_key.priv signing_key.x509 x509.genkey		\
1074		  extra_certificates signing_key.x509.keyid		\
1075		  signing_key.x509.signer
1076
1077# clean - Delete most, but leave enough to build external modules
1078#
1079clean: rm-dirs  := $(CLEAN_DIRS)
1080clean: rm-files := $(CLEAN_FILES)
1081clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1082
1083PHONY += $(clean-dirs) clean archclean vmlinuxclean
1084$(clean-dirs):
1085	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1086
1087vmlinuxclean:
1088	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1089
1090clean: archclean vmlinuxclean
1091
1092# mrproper - Delete all generated files, including .config
1093#
1094mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1095mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1096mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1097
1098PHONY += $(mrproper-dirs) mrproper archmrproper
1099$(mrproper-dirs):
1100	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1101
1102mrproper: clean archmrproper $(mrproper-dirs)
1103	$(call cmd,rmdirs)
1104	$(call cmd,rmfiles)
1105
1106# distclean
1107#
1108PHONY += distclean
1109
1110distclean: mrproper
1111	@find $(srctree) $(RCS_FIND_IGNORE) \
1112		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1113		-o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1114		-o -name '.*.rej' \
1115		-o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1116		-type f -print | xargs rm -f
1117
1118
1119# Packaging of the kernel to various formats
1120# ---------------------------------------------------------------------------
1121# rpm target kept for backward compatibility
1122package-dir	:= $(srctree)/scripts/package
1123
1124%src-pkg: FORCE
1125	$(Q)$(MAKE) $(build)=$(package-dir) $@
1126%pkg: include/config/kernel.release FORCE
1127	$(Q)$(MAKE) $(build)=$(package-dir) $@
1128rpm: include/config/kernel.release FORCE
1129	$(Q)$(MAKE) $(build)=$(package-dir) $@
1130
1131
1132# Brief documentation of the typical targets used
1133# ---------------------------------------------------------------------------
1134
1135boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1136boards := $(notdir $(boards))
1137board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1138board-dirs := $(sort $(notdir $(board-dirs:/=)))
1139
1140help:
1141	@echo  'Cleaning targets:'
1142	@echo  '  clean		  - Remove most generated files but keep the config and'
1143	@echo  '                    enough build support to build external modules'
1144	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1145	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
1146	@echo  ''
1147	@echo  'Configuration targets:'
1148	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1149	@echo  ''
1150	@echo  'Other generic targets:'
1151	@echo  '  all		  - Build all targets marked with [*]'
1152	@echo  '* vmlinux	  - Build the bare kernel'
1153	@echo  '* modules	  - Build all modules'
1154	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1155	@echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1156	@echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1157	@echo  '  dir/            - Build all files in dir and below'
1158	@echo  '  dir/file.[oisS] - Build specified target only'
1159	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1160	@echo  '                    (requires a recent binutils and recent build (System.map))'
1161	@echo  '  dir/file.ko     - Build module including final link'
1162	@echo  '  modules_prepare - Set up for building external modules'
1163	@echo  '  tags/TAGS	  - Generate tags file for editors'
1164	@echo  '  cscope	  - Generate cscope index'
1165	@echo  '  gtags           - Generate GNU GLOBAL index'
1166	@echo  '  kernelrelease	  - Output the release version string'
1167	@echo  '  kernelversion	  - Output the version stored in Makefile'
1168	@echo  '  image_name	  - Output the image name'
1169	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1170	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1171	 echo  ''
1172	@echo  'Static analysers'
1173	@echo  '  checkstack      - Generate a list of stack hogs'
1174	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1175	@echo  '  versioncheck    - Sanity check on version.h usage'
1176	@echo  '  includecheck    - Check for duplicate included header files'
1177	@echo  '  export_report   - List the usages of all exported symbols'
1178	@echo  '  headers_check   - Sanity check on exported headers'
1179	@echo  '  headerdep       - Detect inclusion cycles in headers'
1180	@$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1181	@echo  ''
1182	@echo  'Kernel packaging:'
1183	@$(MAKE) $(build)=$(package-dir) help
1184	@echo  ''
1185	@echo  'Documentation targets:'
1186	@$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1187	@echo  ''
1188	@echo  'Architecture specific targets ($(SRCARCH)):'
1189	@$(if $(archhelp),$(archhelp),\
1190		echo '  No architecture specific help defined for $(SRCARCH)')
1191	@echo  ''
1192	@$(if $(boards), \
1193		$(foreach b, $(boards), \
1194		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1195		echo '')
1196	@$(if $(board-dirs), \
1197		$(foreach b, $(board-dirs), \
1198		printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1199		printf "  %-16s - Show all of the above\\n" help-boards; \
1200		echo '')
1201
1202	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1203	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1204	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1205	@echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1206	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1207	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1208	@echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1209	@echo  '		1: warnings which may be relevant and do not occur too often'
1210	@echo  '		2: warnings which occur quite often but may still be relevant'
1211	@echo  '		3: more obscure warnings, can most likely be ignored'
1212	@echo  '		Multiple levels can be combined with W=12 or W=123'
1213	@echo  ''
1214	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
1215	@echo  'For further info see the ./README file'
1216
1217
1218help-board-dirs := $(addprefix help-,$(board-dirs))
1219
1220help-boards: $(help-board-dirs)
1221
1222boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1223
1224$(help-board-dirs): help-%:
1225	@echo  'Architecture specific targets ($(SRCARCH) $*):'
1226	@$(if $(boards-per-dir), \
1227		$(foreach b, $(boards-per-dir), \
1228		printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1229		echo '')
1230
1231
1232# Documentation targets
1233# ---------------------------------------------------------------------------
1234%docs: scripts_basic FORCE
1235	$(Q)$(MAKE) $(build)=scripts build_docproc
1236	$(Q)$(MAKE) $(build)=Documentation/DocBook $@
1237
1238else # KBUILD_EXTMOD
1239
1240###
1241# External module support.
1242# When building external modules the kernel used as basis is considered
1243# read-only, and no consistency checks are made and the make
1244# system is not used on the basis kernel. If updates are required
1245# in the basis kernel ordinary make commands (without M=...) must
1246# be used.
1247#
1248# The following are the only valid targets when building external
1249# modules.
1250# make M=dir clean     Delete all automatically generated files
1251# make M=dir modules   Make all modules in specified dir
1252# make M=dir	       Same as 'make M=dir modules'
1253# make M=dir modules_install
1254#                      Install the modules built in the module directory
1255#                      Assumes install directory is already created
1256
1257# We are always building modules
1258KBUILD_MODULES := 1
1259PHONY += crmodverdir
1260crmodverdir:
1261	$(cmd_crmodverdir)
1262
1263PHONY += $(objtree)/Module.symvers
1264$(objtree)/Module.symvers:
1265	@test -e $(objtree)/Module.symvers || ( \
1266	echo; \
1267	echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1268	echo "           is missing; modules will have no dependencies and modversions."; \
1269	echo )
1270
1271module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1272PHONY += $(module-dirs) modules
1273$(module-dirs): crmodverdir $(objtree)/Module.symvers
1274	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1275
1276modules: $(module-dirs)
1277	@$(kecho) '  Building modules, stage 2.';
1278	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1279
1280PHONY += modules_install
1281modules_install: _emodinst_ _emodinst_post
1282
1283install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1284PHONY += _emodinst_
1285_emodinst_:
1286	$(Q)mkdir -p $(MODLIB)/$(install-dir)
1287	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1288
1289PHONY += _emodinst_post
1290_emodinst_post: _emodinst_
1291	$(call cmd,depmod)
1292
1293clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1294
1295PHONY += $(clean-dirs) clean
1296$(clean-dirs):
1297	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1298
1299clean:	rm-dirs := $(MODVERDIR)
1300clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1301
1302help:
1303	@echo  '  Building external modules.'
1304	@echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1305	@echo  ''
1306	@echo  '  modules         - default target, build the module(s)'
1307	@echo  '  modules_install - install the module'
1308	@echo  '  clean           - remove generated files in module directory only'
1309	@echo  ''
1310
1311# Dummies...
1312PHONY += prepare scripts
1313prepare: ;
1314scripts: ;
1315endif # KBUILD_EXTMOD
1316
1317clean: $(clean-dirs)
1318	$(call cmd,rmdirs)
1319	$(call cmd,rmfiles)
1320	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1321		\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1322		-o -name '*.ko.*' \
1323		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1324		-o -name '*.symtypes' -o -name 'modules.order' \
1325		-o -name modules.builtin -o -name '.tmp_*.o.*' \
1326		-o -name '*.gcno' \) -type f -print | xargs rm -f
1327
1328# Generate tags for editors
1329# ---------------------------------------------------------------------------
1330quiet_cmd_tags = GEN     $@
1331      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1332
1333tags TAGS cscope gtags: FORCE
1334	$(call cmd,tags)
1335
1336# Scripts to check various things for consistency
1337# ---------------------------------------------------------------------------
1338
1339PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1340
1341includecheck:
1342	find $(srctree)/* $(RCS_FIND_IGNORE) \
1343		-name '*.[hcS]' -type f -print | sort \
1344		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1345
1346versioncheck:
1347	find $(srctree)/* $(RCS_FIND_IGNORE) \
1348		-name '*.[hcS]' -type f -print | sort \
1349		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1350
1351coccicheck:
1352	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1353
1354namespacecheck:
1355	$(PERL) $(srctree)/scripts/namespace.pl
1356
1357export_report:
1358	$(PERL) $(srctree)/scripts/export_report.pl
1359
1360endif #ifeq ($(config-targets),1)
1361endif #ifeq ($(mixed-targets),1)
1362
1363PHONY += checkstack kernelrelease kernelversion image_name
1364
1365# UML needs a little special treatment here.  It wants to use the host
1366# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1367# else wants $(ARCH), including people doing cross-builds, which means
1368# that $(SUBARCH) doesn't work here.
1369ifeq ($(ARCH), um)
1370CHECKSTACK_ARCH := $(SUBARCH)
1371else
1372CHECKSTACK_ARCH := $(ARCH)
1373endif
1374checkstack:
1375	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1376	$(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1377
1378kernelrelease:
1379	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1380
1381kernelversion:
1382	@echo $(KERNELVERSION)
1383
1384image_name:
1385	@echo $(KBUILD_IMAGE)
1386
1387# Clear a bunch of variables before executing the submake
1388tools/: FORCE
1389	$(Q)mkdir -p $(objtree)/tools
1390	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1391
1392tools/%: FORCE
1393	$(Q)mkdir -p $(objtree)/tools
1394	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1395
1396# Single targets
1397# ---------------------------------------------------------------------------
1398# Single targets are compatible with:
1399# - build with mixed source and output
1400# - build with separate output dir 'make O=...'
1401# - external modules
1402#
1403#  target-dir => where to store outputfile
1404#  build-dir  => directory in kernel source tree to use
1405
1406ifeq ($(KBUILD_EXTMOD),)
1407        build-dir  = $(patsubst %/,%,$(dir $@))
1408        target-dir = $(dir $@)
1409else
1410        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1411        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1412        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1413endif
1414
1415%.s: %.c prepare scripts FORCE
1416	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1417%.i: %.c prepare scripts FORCE
1418	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1419%.o: %.c prepare scripts FORCE
1420	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1421%.lst: %.c prepare scripts FORCE
1422	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1423%.s: %.S prepare scripts FORCE
1424	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1425%.o: %.S prepare scripts FORCE
1426	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1427%.symtypes: %.c prepare scripts FORCE
1428	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1429
1430# Modules
1431/: prepare scripts FORCE
1432	$(cmd_crmodverdir)
1433	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1434	$(build)=$(build-dir)
1435%/: prepare scripts FORCE
1436	$(cmd_crmodverdir)
1437	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1438	$(build)=$(build-dir)
1439%.ko: prepare scripts FORCE
1440	$(cmd_crmodverdir)
1441	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1442	$(build)=$(build-dir) $(@:.ko=.o)
1443	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1444
1445# FIXME Should go into a make.lib or something
1446# ===========================================================================
1447
1448quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1449      cmd_rmdirs = rm -rf $(rm-dirs)
1450
1451quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1452      cmd_rmfiles = rm -f $(rm-files)
1453
1454# Run depmod only if we have System.map and depmod is executable
1455quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1456      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1457                   $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1458
1459# Create temporary dir for module support files
1460# clean it up only when building all modules
1461cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1462                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1463
1464# read all saved command lines
1465
1466targets := $(wildcard $(sort $(targets)))
1467cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1468
1469ifneq ($(cmd_files),)
1470  $(cmd_files): ;	# Do not try to update included dependency files
1471  include $(cmd_files)
1472endif
1473
1474# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1475# Usage:
1476# $(Q)$(MAKE) $(clean)=dir
1477clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1478
1479endif	# skip-makefile
1480
1481PHONY += FORCE
1482FORCE:
1483
1484# Declare the contents of the .PHONY variable as phony.  We keep that
1485# information in a variable so we can use it in if_changed and friends.
1486.PHONY: $(PHONY)
1487