Root/Makefile

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

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