Root/Makefile

1VERSION = 3
2PATCHLEVEL = 9
3SUBLEVEL = 0
4EXTRAVERSION =
5NAME = Unicycling Gorilla
6
7# *DOCUMENTATION*
8# To see a list of typical targets execute "make help"
9# More info can be located in ./README
10# Comments in this file are targeted only to the developer, do not
11# expect to learn how to build the kernel reading this file.
12
13# Do not:
14# o use make's built-in rules and variables
15# (this increases performance and avoids hard-to-debug behaviour);
16# o print "Entering directory ...";
17MAKEFLAGS += -rR --no-print-directory
18
19# Avoid funny character set dependencies
20unexport LC_ALL
21LC_COLLATE=C
22LC_NUMERIC=C
23export LC_COLLATE LC_NUMERIC
24
25# We are using a recursive build, so we need to do a little thinking
26# to get the ordering right.
27#
28# Most importantly: sub-Makefiles should only ever modify files in
29# their own directory. If in some directory we have a dependency on
30# a file in another dir (which doesn't happen often, but it's often
31# unavoidable when linking the built-in.o targets which finally
32# turn into vmlinux), we will call a sub make in that other dir, and
33# after that we are sure that everything which is in that other dir
34# is now up to date.
35#
36# The only cases where we need to modify files which have global
37# effects are thus separated out and done before the recursive
38# descending is started. They are now explicitly listed as the
39# prepare rule.
40
41# To put more focus on warnings, be less verbose as default
42# Use 'make V=1' to see the full commands
43
44ifeq ("$(origin V)", "command line")
45  KBUILD_VERBOSE = $(V)
46endif
47ifndef KBUILD_VERBOSE
48  KBUILD_VERBOSE = 0
49endif
50
51# Call a source code checker (by default, "sparse") as part of the
52# C compilation.
53#
54# Use 'make C=1' to enable checking of only re-compiled files.
55# Use 'make C=2' to enable checking of *all* source files, regardless
56# of whether they are re-compiled or not.
57#
58# See the file "Documentation/sparse.txt" for more details, including
59# where to get the "sparse" utility.
60
61ifeq ("$(origin C)", "command line")
62  KBUILD_CHECKSRC = $(C)
63endif
64ifndef KBUILD_CHECKSRC
65  KBUILD_CHECKSRC = 0
66endif
67
68# Use make M=dir to specify directory of external module to build
69# Old syntax make ... SUBDIRS=$PWD is still supported
70# Setting the environment variable KBUILD_EXTMOD take precedence
71ifdef SUBDIRS
72  KBUILD_EXTMOD ?= $(SUBDIRS)
73endif
74
75ifeq ("$(origin M)", "command line")
76  KBUILD_EXTMOD := $(M)
77endif
78
79# kbuild supports saving output files in a separate directory.
80# To locate output files in a separate directory two syntaxes are supported.
81# In both cases the working directory must be the root of the kernel src.
82# 1) O=
83# Use "make O=dir/to/store/output/files/"
84#
85# 2) Set KBUILD_OUTPUT
86# Set the environment variable KBUILD_OUTPUT to point to the directory
87# where the output files shall be placed.
88# export KBUILD_OUTPUT=dir/to/store/output/files/
89# make
90#
91# The O= assignment takes precedence over the KBUILD_OUTPUT environment
92# variable.
93
94
95# KBUILD_SRC is set on invocation of make in OBJ directory
96# KBUILD_SRC is not intended to be used by the regular user (for now)
97ifeq ($(KBUILD_SRC),)
98
99# OK, Make called in directory where kernel src resides
100# Do we want to locate output files in a separate directory?
101ifeq ("$(origin O)", "command line")
102  KBUILD_OUTPUT := $(O)
103endif
104
105ifeq ("$(origin W)", "command line")
106  export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
107endif
108
109# That's our default target when none is given on the command line
110PHONY := _all
111_all:
112
113# Cancel implicit rules on top Makefile
114$(CURDIR)/Makefile Makefile: ;
115
116ifneq ($(KBUILD_OUTPUT),)
117# Invoke a second make in the output directory, passing relevant variables
118# check that the output directory actually exists
119saved-output := $(KBUILD_OUTPUT)
120KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
121$(if $(KBUILD_OUTPUT),, \
122     $(error output directory "$(saved-output)" does not exist))
123
124PHONY += $(MAKECMDGOALS) sub-make
125
126$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
127    @:
128
129sub-make: FORCE
130    $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
131    KBUILD_SRC=$(CURDIR) \
132    KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
133    $(filter-out _all sub-make,$(MAKECMDGOALS))
134
135# Leave processing to above invocation of make
136skip-makefile := 1
137endif # ifneq ($(KBUILD_OUTPUT),)
138endif # ifeq ($(KBUILD_SRC),)
139
140# We process the rest of the Makefile if this is the final invocation of make
141ifeq ($(skip-makefile),)
142
143# If building an external module we do not care about the all: rule
144# but instead _all depend on modules
145PHONY += all
146ifeq ($(KBUILD_EXTMOD),)
147_all: all
148else
149_all: modules
150endif
151
152srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
153objtree := $(CURDIR)
154src := $(srctree)
155obj := $(objtree)
156
157VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
158
159export srctree objtree VPATH
160
161
162# SUBARCH tells the usermode build what the underlying arch is. That is set
163# first, and if a usermode build is happening, the "ARCH=um" on the command
164# line overrides the setting of ARCH below. If a native build is happening,
165# then ARCH is assigned, getting whatever value it gets normally, and
166# SUBARCH is subsequently ignored.
167
168SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
169                  -e s/sun4u/sparc64/ \
170                  -e s/arm.*/arm/ -e s/sa110/arm/ \
171                  -e s/s390x/s390/ -e s/parisc64/parisc/ \
172                  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
173                  -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
174
175# Cross compiling and selecting different set of gcc/bin-utils
176# ---------------------------------------------------------------------------
177#
178# When performing cross compilation for other architectures ARCH shall be set
179# to the target architecture. (See arch/* for the possibilities).
180# ARCH can be set during invocation of make:
181# make ARCH=ia64
182# Another way is to have ARCH set in the environment.
183# The default ARCH is the host where make is executed.
184
185# CROSS_COMPILE specify the prefix used for all executables used
186# during compilation. Only gcc and related bin-utils executables
187# are prefixed with $(CROSS_COMPILE).
188# CROSS_COMPILE can be set on the command line
189# make CROSS_COMPILE=ia64-linux-
190# Alternatively CROSS_COMPILE can be set in the environment.
191# A third alternative is to store a setting in .config so that plain
192# "make" in the configured kernel build directory always uses that.
193# Default value for CROSS_COMPILE is not to prefix executables
194# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
195ARCH ?= $(SUBARCH)
196CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
197
198# Architecture as present in compile.h
199UTS_MACHINE := $(ARCH)
200SRCARCH := $(ARCH)
201
202# Additional ARCH settings for x86
203ifeq ($(ARCH),i386)
204        SRCARCH := x86
205endif
206ifeq ($(ARCH),x86_64)
207        SRCARCH := x86
208endif
209
210# Additional ARCH settings for sparc
211ifeq ($(ARCH),sparc32)
212       SRCARCH := sparc
213endif
214ifeq ($(ARCH),sparc64)
215       SRCARCH := sparc
216endif
217
218# Additional ARCH settings for sh
219ifeq ($(ARCH),sh64)
220       SRCARCH := sh
221endif
222
223# Additional ARCH settings for tile
224ifeq ($(ARCH),tilepro)
225       SRCARCH := tile
226endif
227ifeq ($(ARCH),tilegx)
228       SRCARCH := tile
229endif
230
231# Where to locate arch specific headers
232hdr-arch := $(SRCARCH)
233
234KCONFIG_CONFIG ?= .config
235export KCONFIG_CONFIG
236
237# SHELL used by kbuild
238CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
239      else if [ -x /bin/bash ]; then echo /bin/bash; \
240      else echo sh; fi ; fi)
241
242HOSTCC = gcc
243HOSTCXX = g++
244HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
245HOSTCXXFLAGS = -O2
246
247# Decide whether to build built-in, modular, or both.
248# Normally, just do built-in.
249
250KBUILD_MODULES :=
251KBUILD_BUILTIN := 1
252
253# If we have only "make modules", don't compile built-in objects.
254# When we're building modules with modversions, we need to consider
255# the built-in objects during the descend as well, in order to
256# make sure the checksums are up to date before we record them.
257
258ifeq ($(MAKECMDGOALS),modules)
259  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
260endif
261
262# If we have "make <whatever> modules", compile modules
263# in addition to whatever we do anyway.
264# Just "make" or "make all" shall build modules as well
265
266ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
267  KBUILD_MODULES := 1
268endif
269
270ifeq ($(MAKECMDGOALS),)
271  KBUILD_MODULES := 1
272endif
273
274export KBUILD_MODULES KBUILD_BUILTIN
275export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
276
277# Beautify output
278# ---------------------------------------------------------------------------
279#
280# Normally, we echo the whole command before executing it. By making
281# that echo $($(quiet)$(cmd)), we now have the possibility to set
282# $(quiet) to choose other forms of output instead, e.g.
283#
284# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
285# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
286#
287# If $(quiet) is empty, the whole command will be printed.
288# If it is set to "quiet_", only the short version will be printed.
289# If it is set to "silent_", nothing will be printed at all, since
290# the variable $(silent_cmd_cc_o_c) doesn't exist.
291#
292# A simple variant is to prefix commands with $(Q) - that's useful
293# for commands that shall be hidden in non-verbose mode.
294#
295# $(Q)ln $@ :<
296#
297# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
298# If KBUILD_VERBOSE equals 1 then the above command is displayed.
299
300ifeq ($(KBUILD_VERBOSE),1)
301  quiet =
302  Q =
303else
304  quiet=quiet_
305  Q = @
306endif
307
308# If the user is running make -s (silent mode), suppress echoing of
309# commands
310
311ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
312  quiet=silent_
313endif
314
315export quiet Q KBUILD_VERBOSE
316
317
318# Look for make include files relative to root of kernel src
319MAKEFLAGS += --include-dir=$(srctree)
320
321# We need some generic definitions (do not try to remake the file).
322$(srctree)/scripts/Kbuild.include: ;
323include $(srctree)/scripts/Kbuild.include
324
325# Make variables (CC, etc...)
326
327AS = $(CROSS_COMPILE)as
328LD = $(CROSS_COMPILE)ld
329CC = $(CROSS_COMPILE)gcc
330CPP = $(CC) -E
331AR = $(CROSS_COMPILE)ar
332NM = $(CROSS_COMPILE)nm
333STRIP = $(CROSS_COMPILE)strip
334OBJCOPY = $(CROSS_COMPILE)objcopy
335OBJDUMP = $(CROSS_COMPILE)objdump
336AWK = awk
337GENKSYMS = scripts/genksyms/genksyms
338INSTALLKERNEL := installkernel
339DEPMOD = /sbin/depmod
340PERL = perl
341CHECK = sparse
342
343CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
344          -Wbitwise -Wno-return-void $(CF)
345CFLAGS_MODULE =
346AFLAGS_MODULE =
347LDFLAGS_MODULE =
348CFLAGS_KERNEL =
349AFLAGS_KERNEL =
350CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
351
352
353# Use USERINCLUDE when you must reference the UAPI directories only.
354USERINCLUDE := \
355        -I$(srctree)/arch/$(hdr-arch)/include/uapi \
356        -Iarch/$(hdr-arch)/include/generated/uapi \
357        -I$(srctree)/include/uapi \
358        -Iinclude/generated/uapi \
359                -include $(srctree)/include/linux/kconfig.h
360
361# Use LINUXINCLUDE when you must reference the include/ directory.
362# Needed to be compatible with the O= option
363LINUXINCLUDE := \
364        -I$(srctree)/arch/$(hdr-arch)/include \
365        -Iarch/$(hdr-arch)/include/generated \
366        $(if $(KBUILD_SRC), -I$(srctree)/include) \
367        -Iinclude \
368        $(USERINCLUDE)
369
370KBUILD_CPPFLAGS := -D__KERNEL__
371
372KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
373           -fno-strict-aliasing -fno-common \
374           -Werror-implicit-function-declaration \
375           -Wno-format-security \
376           -fno-delete-null-pointer-checks
377KBUILD_AFLAGS_KERNEL :=
378KBUILD_CFLAGS_KERNEL :=
379KBUILD_AFLAGS := -D__ASSEMBLY__
380KBUILD_AFLAGS_MODULE := -DMODULE
381KBUILD_CFLAGS_MODULE := -DMODULE
382KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
383
384# Read KERNELRELEASE from include/config/kernel.release (if it exists)
385KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
386KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
387
388export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
389export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
390export CPP AR NM STRIP OBJCOPY OBJDUMP
391export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
392export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
393
394export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
395export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
396export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
397export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
398export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
399export KBUILD_ARFLAGS
400
401# When compiling out-of-tree modules, put MODVERDIR in the module
402# tree rather than in the kernel tree. The kernel tree might
403# even be read-only.
404export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
405
406# Files to ignore in find ... statements
407
408RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \
409           -o -name .pc -o -name .hg -o -name .git \) -prune -o
410export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
411             --exclude CVS --exclude .pc --exclude .hg --exclude .git
412
413# ===========================================================================
414# Rules shared between *config targets and build targets
415
416# Basic helpers built in scripts/
417PHONY += scripts_basic
418scripts_basic:
419    $(Q)$(MAKE) $(build)=scripts/basic
420    $(Q)rm -f .tmp_quiet_recordmcount
421
422# To avoid any implicit rule to kick in, define an empty command.
423scripts/basic/%: scripts_basic ;
424
425PHONY += outputmakefile
426# outputmakefile generates a Makefile in the output directory, if using a
427# separate output directory. This allows convenient use of make in the
428# output directory.
429outputmakefile:
430ifneq ($(KBUILD_SRC),)
431    $(Q)ln -fsn $(srctree) source
432    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
433        $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
434endif
435
436# Support for using generic headers in asm-generic
437PHONY += asm-generic
438asm-generic:
439    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
440                src=asm obj=arch/$(SRCARCH)/include/generated/asm
441    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
442                src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
443
444# To make sure we do not include .config for any of the *config targets
445# catch them early, and hand them over to scripts/kconfig/Makefile
446# It is allowed to specify more targets when calling make, including
447# mixing *config targets and build targets.
448# For example 'make oldconfig all'.
449# Detect when mixed targets is specified, and make a second invocation
450# of make so .config is not included in this case either (for *config).
451
452version_h := include/generated/uapi/linux/version.h
453
454no-dot-config-targets := clean mrproper distclean \
455             cscope gtags TAGS tags help %docs check% coccicheck \
456             $(version_h) headers_% archheaders archscripts \
457             kernelversion %src-pkg
458
459config-targets := 0
460mixed-targets := 0
461dot-config := 1
462
463ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
464    ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
465        dot-config := 0
466    endif
467endif
468
469ifeq ($(KBUILD_EXTMOD),)
470        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
471                config-targets := 1
472                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
473                        mixed-targets := 1
474                endif
475        endif
476endif
477
478ifeq ($(mixed-targets),1)
479# ===========================================================================
480# We're called with mixed targets (*config and build targets).
481# Handle them one by one.
482
483%:: FORCE
484    $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
485
486else
487ifeq ($(config-targets),1)
488# ===========================================================================
489# *config targets only - make sure prerequisites are updated, and descend
490# in scripts/kconfig to make the *config target
491
492# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
493# KBUILD_DEFCONFIG may point out an alternative default configuration
494# used for 'make defconfig'
495include $(srctree)/arch/$(SRCARCH)/Makefile
496export KBUILD_DEFCONFIG KBUILD_KCONFIG
497
498config: scripts_basic outputmakefile FORCE
499    $(Q)mkdir -p include/linux include/config
500    $(Q)$(MAKE) $(build)=scripts/kconfig $@
501
502%config: scripts_basic outputmakefile FORCE
503    $(Q)mkdir -p include/linux include/config
504    $(Q)$(MAKE) $(build)=scripts/kconfig $@
505
506else
507# ===========================================================================
508# Build targets only - this includes vmlinux, arch specific targets, clean
509# targets and others. In general all targets except *config targets.
510
511ifeq ($(KBUILD_EXTMOD),)
512# Additional helpers built in scripts/
513# Carefully list dependencies so we do not try to build scripts twice
514# in parallel
515PHONY += scripts
516scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
517     asm-generic
518    $(Q)$(MAKE) $(build)=$(@)
519
520# Objects we will link into vmlinux / subdirs we need to visit
521init-y := init/
522drivers-y := drivers/ sound/ firmware/
523net-y := net/
524libs-y := lib/
525core-y := usr/
526endif # KBUILD_EXTMOD
527
528ifeq ($(dot-config),1)
529# Read in config
530-include include/config/auto.conf
531
532ifeq ($(KBUILD_EXTMOD),)
533# Read in dependencies to all Kconfig* files, make sure to run
534# oldconfig if changes are detected.
535-include include/config/auto.conf.cmd
536
537# To avoid any implicit rule to kick in, define an empty command
538$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
539
540# If .config is newer than include/config/auto.conf, someone tinkered
541# with it and forgot to run make oldconfig.
542# if auto.conf.cmd is missing then we are probably in a cleaned tree so
543# we execute the config step to be sure to catch updated Kconfig files
544include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
545    $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
546else
547# external modules needs include/generated/autoconf.h and include/config/auto.conf
548# but do not care if they are up-to-date. Use auto.conf to trigger the test
549PHONY += include/config/auto.conf
550
551include/config/auto.conf:
552    $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
553    echo >&2; \
554    echo >&2 " ERROR: Kernel configuration is invalid."; \
555    echo >&2 " include/generated/autoconf.h or $@ are missing.";\
556    echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
557    echo >&2 ; \
558    /bin/false)
559
560endif # KBUILD_EXTMOD
561
562else
563# Dummy target needed, because used as prerequisite
564include/config/auto.conf: ;
565endif # $(dot-config)
566
567# The all: target is the default when no target is given on the
568# command line.
569# This allow a user to issue only 'make' to build a kernel including modules
570# Defaults to vmlinux, but the arch makefile usually adds further targets
571all: vmlinux
572
573ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
574KBUILD_CFLAGS += -Os
575else
576KBUILD_CFLAGS += -O2
577endif
578
579include $(srctree)/arch/$(SRCARCH)/Makefile
580
581ifdef CONFIG_READABLE_ASM
582# Disable optimizations that make assembler listings hard to read.
583# reorder blocks reorders the control in the function
584# ipa clone creates specialized cloned functions
585# partial inlining inlines only parts of functions
586KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
587                 $(call cc-option,-fno-ipa-cp-clone,) \
588                 $(call cc-option,-fno-partial-inlining)
589endif
590
591ifneq ($(CONFIG_FRAME_WARN),0)
592KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
593endif
594
595# Force gcc to behave correct even for buggy distributions
596ifndef CONFIG_CC_STACKPROTECTOR
597KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
598endif
599
600# This warning generated too much noise in a regular build.
601# Use make W=1 to enable this warning (see scripts/Makefile.build)
602KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
603
604ifdef CONFIG_FRAME_POINTER
605KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
606else
607# Some targets (ARM with Thumb2, for example), can't be built with frame
608# pointers. For those, we don't have FUNCTION_TRACER automatically
609# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
610# incompatible with -fomit-frame-pointer with current GCC, so we don't use
611# -fomit-frame-pointer with FUNCTION_TRACER.
612ifndef CONFIG_FUNCTION_TRACER
613KBUILD_CFLAGS += -fomit-frame-pointer
614endif
615endif
616
617ifdef CONFIG_DEBUG_INFO
618KBUILD_CFLAGS += -g
619KBUILD_AFLAGS += -gdwarf-2
620endif
621
622ifdef CONFIG_DEBUG_INFO_REDUCED
623KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
624           $(call cc-option,-fno-var-tracking)
625endif
626
627ifdef CONFIG_FUNCTION_TRACER
628ifdef CONFIG_HAVE_FENTRY
629CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
630endif
631KBUILD_CFLAGS += -pg $(CC_USING_FENTRY)
632KBUILD_AFLAGS += $(CC_USING_FENTRY)
633ifdef CONFIG_DYNAMIC_FTRACE
634    ifdef CONFIG_HAVE_C_RECORDMCOUNT
635        BUILD_C_RECORDMCOUNT := y
636        export BUILD_C_RECORDMCOUNT
637    endif
638endif
639endif
640
641# We trigger additional mismatches with less inlining
642ifdef CONFIG_DEBUG_SECTION_MISMATCH
643KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
644endif
645
646# arch Makefile may override CC so keep this after arch Makefile is included
647NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
648CHECKFLAGS += $(NOSTDINC_FLAGS)
649
650# warn about C99 declaration after statement
651KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
652
653# disable pointer signed / unsigned warnings in gcc 4.0
654KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
655
656# disable invalid "can't wrap" optimizations for signed / pointers
657KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
658
659# conserve stack if available
660KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
661
662# use the deterministic mode of AR if available
663KBUILD_ARFLAGS := $(call ar-option,D)
664
665# check for 'asm goto'
666ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
667    KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
668endif
669
670# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
671KBUILD_CPPFLAGS += $(KCPPFLAGS)
672KBUILD_AFLAGS += $(KAFLAGS)
673KBUILD_CFLAGS += $(KCFLAGS)
674
675# Use --build-id when available.
676LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
677                  $(call cc-ldoption, -Wl$(comma)--build-id,))
678KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
679LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
680
681ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
682LDFLAGS_vmlinux += $(call ld-option, -X,)
683endif
684
685# Default kernel image to build when no specific target is given.
686# KBUILD_IMAGE may be overruled on the command line or
687# set in the environment
688# Also any assignments in arch/$(ARCH)/Makefile take precedence over
689# this default value
690export KBUILD_IMAGE ?= vmlinux
691
692#
693# INSTALL_PATH specifies where to place the updated kernel and system map
694# images. Default is /boot, but you can set it to other values
695export INSTALL_PATH ?= /boot
696
697#
698# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
699# relocations required by build roots. This is not defined in the
700# makefile but the argument can be passed to make if needed.
701#
702
703MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
704export MODLIB
705
706#
707# INSTALL_MOD_STRIP, if defined, will cause modules to be
708# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
709# the default option --strip-debug will be used. Otherwise,
710# INSTALL_MOD_STRIP value will be used as the options to the strip command.
711
712ifdef INSTALL_MOD_STRIP
713ifeq ($(INSTALL_MOD_STRIP),1)
714mod_strip_cmd = $(STRIP) --strip-debug
715else
716mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
717endif # INSTALL_MOD_STRIP=1
718else
719mod_strip_cmd = true
720endif # INSTALL_MOD_STRIP
721export mod_strip_cmd
722
723
724ifdef CONFIG_MODULE_SIG_ALL
725MODSECKEY = ./signing_key.priv
726MODPUBKEY = ./signing_key.x509
727export MODPUBKEY
728mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
729else
730mod_sign_cmd = true
731endif
732export mod_sign_cmd
733
734
735ifeq ($(KBUILD_EXTMOD),)
736core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
737
738vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
739             $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
740             $(net-y) $(net-m) $(libs-y) $(libs-m)))
741
742vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
743             $(init-n) $(init-) \
744             $(core-n) $(core-) $(drivers-n) $(drivers-) \
745             $(net-n) $(net-) $(libs-n) $(libs-))))
746
747init-y := $(patsubst %/, %/built-in.o, $(init-y))
748core-y := $(patsubst %/, %/built-in.o, $(core-y))
749drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
750net-y := $(patsubst %/, %/built-in.o, $(net-y))
751libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
752libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
753libs-y := $(libs-y1) $(libs-y2)
754
755# Externally visible symbols (used by link-vmlinux.sh)
756export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
757export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
758export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
759export LDFLAGS_vmlinux
760
761vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
762
763# Final link of vmlinux
764      cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
765quiet_cmd_link-vmlinux = LINK $@
766
767# Include targets which we want to
768# execute if the rest of the kernel build went well.
769vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
770ifdef CONFIG_HEADERS_CHECK
771    $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
772endif
773ifdef CONFIG_SAMPLES
774    $(Q)$(MAKE) $(build)=samples
775endif
776ifdef CONFIG_BUILD_DOCSRC
777    $(Q)$(MAKE) $(build)=Documentation
778endif
779    +$(call if_changed,link-vmlinux)
780
781# The actual objects are generated when descending,
782# make sure no implicit rule kicks in
783$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
784
785# Handle descending into subdirectories listed in $(vmlinux-dirs)
786# Preset locale variables to speed up the build process. Limit locale
787# tweaks to this spot to avoid wrong language settings when running
788# make menuconfig etc.
789# Error messages still appears in the original language
790
791PHONY += $(vmlinux-dirs)
792$(vmlinux-dirs): prepare scripts
793    $(Q)$(MAKE) $(build)=$@
794
795# Store (new) KERNELRELASE string in include/config/kernel.release
796include/config/kernel.release: include/config/auto.conf FORCE
797    $(Q)rm -f $@
798    $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
799
800
801# Things we need to do before we recursively start building the kernel
802# or the modules are listed in "prepare".
803# A multi level approach is used. prepareN is processed before prepareN-1.
804# archprepare is used in arch Makefiles and when processed asm symlink,
805# version.h and scripts_basic is processed / created.
806
807# Listed in dependency order
808PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
809
810# prepare3 is used to check if we are building in a separate output directory,
811# and if so do:
812# 1) Check that make has not been executed in the kernel src $(srctree)
813prepare3: include/config/kernel.release
814ifneq ($(KBUILD_SRC),)
815    @$(kecho) ' Using $(srctree) as source for kernel'
816    $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
817        echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
818        echo >&2 " in the '$(srctree)' directory.";\
819        /bin/false; \
820    fi;
821endif
822
823# prepare2 creates a makefile if using a separate output directory
824prepare2: prepare3 outputmakefile asm-generic
825
826prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
827                   include/config/auto.conf
828    $(cmd_crmodverdir)
829
830archprepare: archheaders archscripts prepare1 scripts_basic
831
832prepare0: archprepare FORCE
833    $(Q)$(MAKE) $(build)=.
834
835# All the preparing..
836prepare: prepare0
837
838# Generate some files
839# ---------------------------------------------------------------------------
840
841# KERNELRELEASE can change from a few different places, meaning version.h
842# needs to be updated, so this check is forced on all builds
843
844uts_len := 64
845define filechk_utsrelease.h
846    if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
847      echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
848      exit 1; \
849    fi; \
850    (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
851endef
852
853define filechk_version.h
854    (echo \#define LINUX_VERSION_CODE $(shell \
855    expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
856    echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
857endef
858
859$(version_h): $(srctree)/Makefile FORCE
860    $(call filechk,version.h)
861
862include/generated/utsrelease.h: include/config/kernel.release FORCE
863    $(call filechk,utsrelease.h)
864
865PHONY += headerdep
866headerdep:
867    $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
868    $(srctree)/scripts/headerdep.pl -I$(srctree)/include
869
870# ---------------------------------------------------------------------------
871
872PHONY += depend dep
873depend dep:
874    @echo '*** Warning: make $@ is unnecessary now.'
875
876# ---------------------------------------------------------------------------
877# Firmware install
878INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
879export INSTALL_FW_PATH
880
881PHONY += firmware_install
882firmware_install: FORCE
883    @mkdir -p $(objtree)/firmware
884    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
885
886# ---------------------------------------------------------------------------
887# Kernel headers
888
889#Default location for installed headers
890export INSTALL_HDR_PATH = $(objtree)/usr
891
892hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
893
894# If we do an all arch process set dst to asm-$(hdr-arch)
895hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
896
897PHONY += archheaders
898archheaders:
899
900PHONY += archscripts
901archscripts:
902
903PHONY += __headers
904__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
905    $(Q)$(MAKE) $(build)=scripts build_unifdef
906
907PHONY += headers_install_all
908headers_install_all:
909    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
910
911PHONY += headers_install
912headers_install: __headers
913    $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
914      $(error Headers not exportable for the $(SRCARCH) architecture))
915    $(Q)$(MAKE) $(hdr-inst)=include/uapi
916    $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
917
918PHONY += headers_check_all
919headers_check_all: headers_install_all
920    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
921
922PHONY += headers_check
923headers_check: headers_install
924    $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
925    $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
926
927# ---------------------------------------------------------------------------
928# Modules
929
930ifdef CONFIG_MODULES
931
932# By default, build modules as well
933
934all: modules
935
936# Build modules
937#
938# A module can be listed more than once in obj-m resulting in
939# duplicate lines in modules.order files. Those are removed
940# using awk while concatenating to the final file.
941
942PHONY += modules
943modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
944    $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
945    @$(kecho) ' Building modules, stage 2.';
946    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
947    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
948
949modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
950    $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
951
952%/modules.builtin: include/config/auto.conf
953    $(Q)$(MAKE) $(modbuiltin)=$*
954
955
956# Target to prepare building external modules
957PHONY += modules_prepare
958modules_prepare: prepare scripts
959
960# Target to install modules
961PHONY += modules_install
962modules_install: _modinst_ _modinst_post
963
964PHONY += _modinst_
965_modinst_:
966    @rm -rf $(MODLIB)/kernel
967    @rm -f $(MODLIB)/source
968    @mkdir -p $(MODLIB)/kernel
969    @ln -s $(srctree) $(MODLIB)/source
970    @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
971        rm -f $(MODLIB)/build ; \
972        ln -s $(objtree) $(MODLIB)/build ; \
973    fi
974    @cp -f $(objtree)/modules.order $(MODLIB)/
975    @cp -f $(objtree)/modules.builtin $(MODLIB)/
976    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
977
978# This depmod is only for convenience to give the initial
979# boot a modules.dep even before / is mounted read-write. However the
980# boot script depmod is the master version.
981PHONY += _modinst_post
982_modinst_post: _modinst_
983    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
984    $(call cmd,depmod)
985
986ifeq ($(CONFIG_MODULE_SIG), y)
987PHONY += modules_sign
988modules_sign:
989    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
990endif
991
992else # CONFIG_MODULES
993
994# Modules not configured
995# ---------------------------------------------------------------------------
996
997modules modules_install: FORCE
998    @echo >&2
999    @echo >&2 "The present kernel configuration has modules disabled."
1000    @echo >&2 "Type 'make config' and enable loadable module support."
1001    @echo >&2 "Then build a kernel with module support enabled."
1002    @echo >&2
1003    @exit 1
1004
1005endif # CONFIG_MODULES
1006
1007###
1008# Cleaning is done on three levels.
1009# make clean Delete most generated files
1010# Leave enough to build external modules
1011# make mrproper Delete the current configuration, and all generated files
1012# make distclean Remove editor backup files, patch leftover files and the like
1013
1014# Directories & files removed with 'make clean'
1015CLEAN_DIRS += $(MODVERDIR)
1016
1017# Directories & files removed with 'make mrproper'
1018MRPROPER_DIRS += include/config usr/include include/generated \
1019                  arch/*/include/generated
1020MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1021          Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1022          signing_key.priv signing_key.x509 x509.genkey \
1023          extra_certificates signing_key.x509.keyid \
1024          signing_key.x509.signer
1025
1026# clean - Delete most, but leave enough to build external modules
1027#
1028clean: rm-dirs := $(CLEAN_DIRS)
1029clean: rm-files := $(CLEAN_FILES)
1030clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1031
1032PHONY += $(clean-dirs) clean archclean vmlinuxclean
1033$(clean-dirs):
1034    $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1035
1036vmlinuxclean:
1037    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1038
1039clean: archclean vmlinuxclean
1040
1041# mrproper - Delete all generated files, including .config
1042#
1043mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1044mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1045mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1046
1047PHONY += $(mrproper-dirs) mrproper archmrproper
1048$(mrproper-dirs):
1049    $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1050
1051mrproper: clean archmrproper $(mrproper-dirs)
1052    $(call cmd,rmdirs)
1053    $(call cmd,rmfiles)
1054
1055# distclean
1056#
1057PHONY += distclean
1058
1059distclean: mrproper
1060    @find $(srctree) $(RCS_FIND_IGNORE) \
1061        \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1062        -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1063        -o -name '.*.rej' \
1064        -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1065        -type f -print | xargs rm -f
1066
1067
1068# Packaging of the kernel to various formats
1069# ---------------------------------------------------------------------------
1070# rpm target kept for backward compatibility
1071package-dir := $(srctree)/scripts/package
1072
1073%src-pkg: FORCE
1074    $(Q)$(MAKE) $(build)=$(package-dir) $@
1075%pkg: include/config/kernel.release FORCE
1076    $(Q)$(MAKE) $(build)=$(package-dir) $@
1077rpm: include/config/kernel.release FORCE
1078    $(Q)$(MAKE) $(build)=$(package-dir) $@
1079
1080
1081# Brief documentation of the typical targets used
1082# ---------------------------------------------------------------------------
1083
1084boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1085boards := $(notdir $(boards))
1086board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1087board-dirs := $(sort $(notdir $(board-dirs:/=)))
1088
1089help:
1090    @echo 'Cleaning targets:'
1091    @echo ' clean - Remove most generated files but keep the config and'
1092    @echo ' enough build support to build external modules'
1093    @echo ' mrproper - Remove all generated files + config + various backup files'
1094    @echo ' distclean - mrproper + remove editor backup and patch files'
1095    @echo ''
1096    @echo 'Configuration targets:'
1097    @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1098    @echo ''
1099    @echo 'Other generic targets:'
1100    @echo ' all - Build all targets marked with [*]'
1101    @echo '* vmlinux - Build the bare kernel'
1102    @echo '* modules - Build all modules'
1103    @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1104    @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1105    @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1106    @echo ' dir/ - Build all files in dir and below'
1107    @echo ' dir/file.[oisS] - Build specified target only'
1108    @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1109    @echo ' (requires a recent binutils and recent build (System.map))'
1110    @echo ' dir/file.ko - Build module including final link'
1111    @echo ' modules_prepare - Set up for building external modules'
1112    @echo ' tags/TAGS - Generate tags file for editors'
1113    @echo ' cscope - Generate cscope index'
1114    @echo ' gtags - Generate GNU GLOBAL index'
1115    @echo ' kernelrelease - Output the release version string'
1116    @echo ' kernelversion - Output the version stored in Makefile'
1117    @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1118     echo ' (default: $(INSTALL_HDR_PATH))'; \
1119     echo ''
1120    @echo 'Static analysers'
1121    @echo ' checkstack - Generate a list of stack hogs'
1122    @echo ' namespacecheck - Name space analysis on compiled kernel'
1123    @echo ' versioncheck - Sanity check on version.h usage'
1124    @echo ' includecheck - Check for duplicate included header files'
1125    @echo ' export_report - List the usages of all exported symbols'
1126    @echo ' headers_check - Sanity check on exported headers'
1127    @echo ' headerdep - Detect inclusion cycles in headers'
1128    @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1129    @echo ''
1130    @echo 'Kernel packaging:'
1131    @$(MAKE) $(build)=$(package-dir) help
1132    @echo ''
1133    @echo 'Documentation targets:'
1134    @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1135    @echo ''
1136    @echo 'Architecture specific targets ($(SRCARCH)):'
1137    @$(if $(archhelp),$(archhelp),\
1138        echo ' No architecture specific help defined for $(SRCARCH)')
1139    @echo ''
1140    @$(if $(boards), \
1141        $(foreach b, $(boards), \
1142        printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1143        echo '')
1144    @$(if $(board-dirs), \
1145        $(foreach b, $(board-dirs), \
1146        printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1147        printf " %-16s - Show all of the above\\n" help-boards; \
1148        echo '')
1149
1150    @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1151    @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1152    @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1153    @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1154    @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1155    @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1156    @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1157    @echo ' 1: warnings which may be relevant and do not occur too often'
1158    @echo ' 2: warnings which occur quite often but may still be relevant'
1159    @echo ' 3: more obscure warnings, can most likely be ignored'
1160    @echo ' Multiple levels can be combined with W=12 or W=123'
1161    @echo ''
1162    @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1163    @echo 'For further info see the ./README file'
1164
1165
1166help-board-dirs := $(addprefix help-,$(board-dirs))
1167
1168help-boards: $(help-board-dirs)
1169
1170boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1171
1172$(help-board-dirs): help-%:
1173    @echo 'Architecture specific targets ($(SRCARCH) $*):'
1174    @$(if $(boards-per-dir), \
1175        $(foreach b, $(boards-per-dir), \
1176        printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1177        echo '')
1178
1179
1180# Documentation targets
1181# ---------------------------------------------------------------------------
1182%docs: scripts_basic FORCE
1183    $(Q)$(MAKE) $(build)=scripts build_docproc
1184    $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1185
1186else # KBUILD_EXTMOD
1187
1188###
1189# External module support.
1190# When building external modules the kernel used as basis is considered
1191# read-only, and no consistency checks are made and the make
1192# system is not used on the basis kernel. If updates are required
1193# in the basis kernel ordinary make commands (without M=...) must
1194# be used.
1195#
1196# The following are the only valid targets when building external
1197# modules.
1198# make M=dir clean Delete all automatically generated files
1199# make M=dir modules Make all modules in specified dir
1200# make M=dir Same as 'make M=dir modules'
1201# make M=dir modules_install
1202# Install the modules built in the module directory
1203# Assumes install directory is already created
1204
1205# We are always building modules
1206KBUILD_MODULES := 1
1207PHONY += crmodverdir
1208crmodverdir:
1209    $(cmd_crmodverdir)
1210
1211PHONY += $(objtree)/Module.symvers
1212$(objtree)/Module.symvers:
1213    @test -e $(objtree)/Module.symvers || ( \
1214    echo; \
1215    echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1216    echo " is missing; modules will have no dependencies and modversions."; \
1217    echo )
1218
1219module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1220PHONY += $(module-dirs) modules
1221$(module-dirs): crmodverdir $(objtree)/Module.symvers
1222    $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1223
1224modules: $(module-dirs)
1225    @$(kecho) ' Building modules, stage 2.';
1226    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1227
1228PHONY += modules_install
1229modules_install: _emodinst_ _emodinst_post
1230
1231install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1232PHONY += _emodinst_
1233_emodinst_:
1234    $(Q)mkdir -p $(MODLIB)/$(install-dir)
1235    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1236
1237PHONY += _emodinst_post
1238_emodinst_post: _emodinst_
1239    $(call cmd,depmod)
1240
1241clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1242
1243PHONY += $(clean-dirs) clean
1244$(clean-dirs):
1245    $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1246
1247clean: rm-dirs := $(MODVERDIR)
1248clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1249
1250help:
1251    @echo ' Building external modules.'
1252    @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1253    @echo ''
1254    @echo ' modules - default target, build the module(s)'
1255    @echo ' modules_install - install the module'
1256    @echo ' clean - remove generated files in module directory only'
1257    @echo ''
1258
1259# Dummies...
1260PHONY += prepare scripts
1261prepare: ;
1262scripts: ;
1263endif # KBUILD_EXTMOD
1264
1265clean: $(clean-dirs)
1266    $(call cmd,rmdirs)
1267    $(call cmd,rmfiles)
1268    @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1269        \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1270        -o -name '*.ko.*' \
1271        -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1272        -o -name '*.symtypes' -o -name 'modules.order' \
1273        -o -name modules.builtin -o -name '.tmp_*.o.*' \
1274        -o -name '*.gcno' \) -type f -print | xargs rm -f
1275
1276# Generate tags for editors
1277# ---------------------------------------------------------------------------
1278quiet_cmd_tags = GEN $@
1279      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1280
1281tags TAGS cscope gtags: FORCE
1282    $(call cmd,tags)
1283
1284# Scripts to check various things for consistency
1285# ---------------------------------------------------------------------------
1286
1287PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1288
1289includecheck:
1290    find $(srctree)/* $(RCS_FIND_IGNORE) \
1291        -name '*.[hcS]' -type f -print | sort \
1292        | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1293
1294versioncheck:
1295    find $(srctree)/* $(RCS_FIND_IGNORE) \
1296        -name '*.[hcS]' -type f -print | sort \
1297        | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1298
1299coccicheck:
1300    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1301
1302namespacecheck:
1303    $(PERL) $(srctree)/scripts/namespace.pl
1304
1305export_report:
1306    $(PERL) $(srctree)/scripts/export_report.pl
1307
1308endif #ifeq ($(config-targets),1)
1309endif #ifeq ($(mixed-targets),1)
1310
1311PHONY += checkstack kernelrelease kernelversion
1312
1313# UML needs a little special treatment here. It wants to use the host
1314# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1315# else wants $(ARCH), including people doing cross-builds, which means
1316# that $(SUBARCH) doesn't work here.
1317ifeq ($(ARCH), um)
1318CHECKSTACK_ARCH := $(SUBARCH)
1319else
1320CHECKSTACK_ARCH := $(ARCH)
1321endif
1322checkstack:
1323    $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1324    $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1325
1326kernelrelease:
1327    @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1328
1329kernelversion:
1330    @echo $(KERNELVERSION)
1331
1332# Clear a bunch of variables before executing the submake
1333tools/: FORCE
1334    $(Q)mkdir -p $(objtree)/tools
1335    $(Q)$(MAKE) LDFLAGS= MAKEFLAGS= O=$(objtree) subdir=tools -C $(src)/tools/
1336
1337tools/%: FORCE
1338    $(Q)mkdir -p $(objtree)/tools
1339    $(Q)$(MAKE) LDFLAGS= MAKEFLAGS= O=$(objtree) subdir=tools -C $(src)/tools/ $*
1340
1341# Single targets
1342# ---------------------------------------------------------------------------
1343# Single targets are compatible with:
1344# - build with mixed source and output
1345# - build with separate output dir 'make O=...'
1346# - external modules
1347#
1348# target-dir => where to store outputfile
1349# build-dir => directory in kernel source tree to use
1350
1351ifeq ($(KBUILD_EXTMOD),)
1352        build-dir = $(patsubst %/,%,$(dir $@))
1353        target-dir = $(dir $@)
1354else
1355        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1356        build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1357        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1358endif
1359
1360%.s: %.c prepare scripts FORCE
1361    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1362%.i: %.c prepare scripts FORCE
1363    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1364%.o: %.c prepare scripts FORCE
1365    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1366%.lst: %.c prepare scripts FORCE
1367    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1368%.s: %.S prepare scripts FORCE
1369    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1370%.o: %.S prepare scripts FORCE
1371    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1372%.symtypes: %.c prepare scripts FORCE
1373    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1374
1375# Modules
1376/: prepare scripts FORCE
1377    $(cmd_crmodverdir)
1378    $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1379    $(build)=$(build-dir)
1380%/: prepare scripts FORCE
1381    $(cmd_crmodverdir)
1382    $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1383    $(build)=$(build-dir)
1384%.ko: prepare scripts FORCE
1385    $(cmd_crmodverdir)
1386    $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1387    $(build)=$(build-dir) $(@:.ko=.o)
1388    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1389
1390# FIXME Should go into a make.lib or something
1391# ===========================================================================
1392
1393quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1394      cmd_rmdirs = rm -rf $(rm-dirs)
1395
1396quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1397      cmd_rmfiles = rm -f $(rm-files)
1398
1399# Run depmod only if we have System.map and depmod is executable
1400quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1401      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1402                   $(KERNELRELEASE) "$(patsubst "%",%,$(CONFIG_SYMBOL_PREFIX))"
1403
1404# Create temporary dir for module support files
1405# clean it up only when building all modules
1406cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1407                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1408
1409# read all saved command lines
1410
1411targets := $(wildcard $(sort $(targets)))
1412cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1413
1414ifneq ($(cmd_files),)
1415  $(cmd_files): ; # Do not try to update included dependency files
1416  include $(cmd_files)
1417endif
1418
1419# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1420# Usage:
1421# $(Q)$(MAKE) $(clean)=dir
1422clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1423
1424endif # skip-makefile
1425
1426PHONY += FORCE
1427FORCE:
1428
1429# Declare the contents of the .PHONY variable as phony. We keep that
1430# information in a variable so we can use it in if_changed and friends.
1431.PHONY: $(PHONY)
1432

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