Root/Makefile

1VERSION = 3
2PATCHLEVEL = 13
3SUBLEVEL = 0
4EXTRAVERSION =
5NAME = One Giant Leap for Frogkind
6
7# *DOCUMENTATION*
8# To see a list of typical targets execute "make help"
9# More info can be located in ./README
10# Comments in this file are targeted only to the developer, do not
11# expect to learn how to build the kernel reading this file.
12
13# Do not:
14# o use make's built-in rules and variables
15# (this increases performance and avoids hard-to-debug behaviour);
16# o print "Entering directory ...";
17MAKEFLAGS += -rR --no-print-directory
18
19# Avoid funny character set dependencies
20unexport LC_ALL
21LC_COLLATE=C
22LC_NUMERIC=C
23export LC_COLLATE LC_NUMERIC
24
25# Avoid interference with shell env settings
26unexport GREP_OPTIONS
27
28# We are using a recursive build, so we need to do a little thinking
29# to get the ordering right.
30#
31# Most importantly: sub-Makefiles should only ever modify files in
32# their own directory. If in some directory we have a dependency on
33# a file in another dir (which doesn't happen often, but it's often
34# unavoidable when linking the built-in.o targets which finally
35# turn into vmlinux), we will call a sub make in that other dir, and
36# after that we are sure that everything which is in that other dir
37# is now up to date.
38#
39# The only cases where we need to modify files which have global
40# effects are thus separated out and done before the recursive
41# descending is started. They are now explicitly listed as the
42# prepare rule.
43
44# To put more focus on warnings, be less verbose as default
45# Use 'make V=1' to see the full commands
46
47ifeq ("$(origin V)", "command line")
48  KBUILD_VERBOSE = $(V)
49endif
50ifndef KBUILD_VERBOSE
51  KBUILD_VERBOSE = 0
52endif
53
54# Call a source code checker (by default, "sparse") as part of the
55# C compilation.
56#
57# Use 'make C=1' to enable checking of only re-compiled files.
58# Use 'make C=2' to enable checking of *all* source files, regardless
59# of whether they are re-compiled or not.
60#
61# See the file "Documentation/sparse.txt" for more details, including
62# where to get the "sparse" utility.
63
64ifeq ("$(origin C)", "command line")
65  KBUILD_CHECKSRC = $(C)
66endif
67ifndef KBUILD_CHECKSRC
68  KBUILD_CHECKSRC = 0
69endif
70
71# Use make M=dir to specify directory of external module to build
72# Old syntax make ... SUBDIRS=$PWD is still supported
73# Setting the environment variable KBUILD_EXTMOD take precedence
74ifdef SUBDIRS
75  KBUILD_EXTMOD ?= $(SUBDIRS)
76endif
77
78ifeq ("$(origin M)", "command line")
79  KBUILD_EXTMOD := $(M)
80endif
81
82# kbuild supports saving output files in a separate directory.
83# To locate output files in a separate directory two syntaxes are supported.
84# In both cases the working directory must be the root of the kernel src.
85# 1) O=
86# Use "make O=dir/to/store/output/files/"
87#
88# 2) Set KBUILD_OUTPUT
89# Set the environment variable KBUILD_OUTPUT to point to the directory
90# where the output files shall be placed.
91# export KBUILD_OUTPUT=dir/to/store/output/files/
92# make
93#
94# The O= assignment takes precedence over the KBUILD_OUTPUT environment
95# variable.
96
97
98# KBUILD_SRC is set on invocation of make in OBJ directory
99# KBUILD_SRC is not intended to be used by the regular user (for now)
100ifeq ($(KBUILD_SRC),)
101
102# OK, Make called in directory where kernel src resides
103# Do we want to locate output files in a separate directory?
104ifeq ("$(origin O)", "command line")
105  KBUILD_OUTPUT := $(O)
106endif
107
108ifeq ("$(origin W)", "command line")
109  export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
110endif
111
112# That's our default target when none is given on the command line
113PHONY := _all
114_all:
115
116# Cancel implicit rules on top Makefile
117$(CURDIR)/Makefile Makefile: ;
118
119ifneq ($(KBUILD_OUTPUT),)
120# Invoke a second make in the output directory, passing relevant variables
121# check that the output directory actually exists
122saved-output := $(KBUILD_OUTPUT)
123KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
124$(if $(KBUILD_OUTPUT),, \
125     $(error output directory "$(saved-output)" does not exist))
126
127PHONY += $(MAKECMDGOALS) sub-make
128
129$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
130    @:
131
132sub-make: FORCE
133    $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
134    KBUILD_SRC=$(CURDIR) \
135    KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
136    $(filter-out _all sub-make,$(MAKECMDGOALS))
137
138# Leave processing to above invocation of make
139skip-makefile := 1
140endif # ifneq ($(KBUILD_OUTPUT),)
141endif # ifeq ($(KBUILD_SRC),)
142
143# We process the rest of the Makefile if this is the final invocation of make
144ifeq ($(skip-makefile),)
145
146# If building an external module we do not care about the all: rule
147# but instead _all depend on modules
148PHONY += all
149ifeq ($(KBUILD_EXTMOD),)
150_all: all
151else
152_all: modules
153endif
154
155srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
156objtree := $(CURDIR)
157src := $(srctree)
158obj := $(objtree)
159
160VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
161
162export srctree objtree VPATH
163
164
165# SUBARCH tells the usermode build what the underlying arch is. That is set
166# first, and if a usermode build is happening, the "ARCH=um" on the command
167# line overrides the setting of ARCH below. If a native build is happening,
168# then ARCH is assigned, getting whatever value it gets normally, and
169# SUBARCH is subsequently ignored.
170
171SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
172                  -e s/sun4u/sparc64/ \
173                  -e s/arm.*/arm/ -e s/sa110/arm/ \
174                  -e s/s390x/s390/ -e s/parisc64/parisc/ \
175                  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
176                  -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
177
178# Cross compiling and selecting different set of gcc/bin-utils
179# ---------------------------------------------------------------------------
180#
181# When performing cross compilation for other architectures ARCH shall be set
182# to the target architecture. (See arch/* for the possibilities).
183# ARCH can be set during invocation of make:
184# make ARCH=ia64
185# Another way is to have ARCH set in the environment.
186# The default ARCH is the host where make is executed.
187
188# CROSS_COMPILE specify the prefix used for all executables used
189# during compilation. Only gcc and related bin-utils executables
190# are prefixed with $(CROSS_COMPILE).
191# CROSS_COMPILE can be set on the command line
192# make CROSS_COMPILE=ia64-linux-
193# Alternatively CROSS_COMPILE can be set in the environment.
194# A third alternative is to store a setting in .config so that plain
195# "make" in the configured kernel build directory always uses that.
196# Default value for CROSS_COMPILE is not to prefix executables
197# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
198ARCH ?= $(SUBARCH)
199CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
200
201# Architecture as present in compile.h
202UTS_MACHINE := $(ARCH)
203SRCARCH := $(ARCH)
204
205# Additional ARCH settings for x86
206ifeq ($(ARCH),i386)
207        SRCARCH := x86
208endif
209ifeq ($(ARCH),x86_64)
210        SRCARCH := x86
211endif
212
213# Additional ARCH settings for sparc
214ifeq ($(ARCH),sparc32)
215       SRCARCH := sparc
216endif
217ifeq ($(ARCH),sparc64)
218       SRCARCH := sparc
219endif
220
221# Additional ARCH settings for sh
222ifeq ($(ARCH),sh64)
223       SRCARCH := sh
224endif
225
226# Additional ARCH settings for tile
227ifeq ($(ARCH),tilepro)
228       SRCARCH := tile
229endif
230ifeq ($(ARCH),tilegx)
231       SRCARCH := tile
232endif
233
234# Where to locate arch specific headers
235hdr-arch := $(SRCARCH)
236
237KCONFIG_CONFIG ?= .config
238export KCONFIG_CONFIG
239
240# SHELL used by kbuild
241CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
242      else if [ -x /bin/bash ]; then echo /bin/bash; \
243      else echo sh; fi ; fi)
244
245HOSTCC = gcc
246HOSTCXX = g++
247HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
248HOSTCXXFLAGS = -O2
249
250# Decide whether to build built-in, modular, or both.
251# Normally, just do built-in.
252
253KBUILD_MODULES :=
254KBUILD_BUILTIN := 1
255
256# If we have only "make modules", don't compile built-in objects.
257# When we're building modules with modversions, we need to consider
258# the built-in objects during the descend as well, in order to
259# make sure the checksums are up to date before we record them.
260
261ifeq ($(MAKECMDGOALS),modules)
262  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
263endif
264
265# If we have "make <whatever> modules", compile modules
266# in addition to whatever we do anyway.
267# Just "make" or "make all" shall build modules as well
268
269ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
270  KBUILD_MODULES := 1
271endif
272
273ifeq ($(MAKECMDGOALS),)
274  KBUILD_MODULES := 1
275endif
276
277export KBUILD_MODULES KBUILD_BUILTIN
278export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
279
280# Beautify output
281# ---------------------------------------------------------------------------
282#
283# Normally, we echo the whole command before executing it. By making
284# that echo $($(quiet)$(cmd)), we now have the possibility to set
285# $(quiet) to choose other forms of output instead, e.g.
286#
287# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
288# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
289#
290# If $(quiet) is empty, the whole command will be printed.
291# If it is set to "quiet_", only the short version will be printed.
292# If it is set to "silent_", nothing will be printed at all, since
293# the variable $(silent_cmd_cc_o_c) doesn't exist.
294#
295# A simple variant is to prefix commands with $(Q) - that's useful
296# for commands that shall be hidden in non-verbose mode.
297#
298# $(Q)ln $@ :<
299#
300# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
301# If KBUILD_VERBOSE equals 1 then the above command is displayed.
302
303ifeq ($(KBUILD_VERBOSE),1)
304  quiet =
305  Q =
306else
307  quiet=quiet_
308  Q = @
309endif
310
311# If the user is running make -s (silent mode), suppress echoing of
312# commands
313
314ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
315  quiet=silent_
316endif
317
318export quiet Q KBUILD_VERBOSE
319
320
321# Look for make include files relative to root of kernel src
322MAKEFLAGS += --include-dir=$(srctree)
323
324# We need some generic definitions (do not try to remake the file).
325$(srctree)/scripts/Kbuild.include: ;
326include $(srctree)/scripts/Kbuild.include
327
328# Make variables (CC, etc...)
329
330AS = $(CROSS_COMPILE)as
331LD = $(CROSS_COMPILE)ld
332CC = $(CROSS_COMPILE)gcc
333CPP = $(CC) -E
334AR = $(CROSS_COMPILE)ar
335NM = $(CROSS_COMPILE)nm
336STRIP = $(CROSS_COMPILE)strip
337OBJCOPY = $(CROSS_COMPILE)objcopy
338OBJDUMP = $(CROSS_COMPILE)objdump
339AWK = awk
340GENKSYMS = scripts/genksyms/genksyms
341INSTALLKERNEL := installkernel
342DEPMOD = /sbin/depmod
343PERL = perl
344CHECK = sparse
345
346CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
347          -Wbitwise -Wno-return-void $(CF)
348CFLAGS_MODULE =
349AFLAGS_MODULE =
350LDFLAGS_MODULE =
351CFLAGS_KERNEL =
352AFLAGS_KERNEL =
353CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
354
355
356# Use USERINCLUDE when you must reference the UAPI directories only.
357USERINCLUDE := \
358        -I$(srctree)/arch/$(hdr-arch)/include/uapi \
359        -Iarch/$(hdr-arch)/include/generated/uapi \
360        -I$(srctree)/include/uapi \
361        -Iinclude/generated/uapi \
362                -include $(srctree)/include/linux/kconfig.h
363
364# Use LINUXINCLUDE when you must reference the include/ directory.
365# Needed to be compatible with the O= option
366LINUXINCLUDE := \
367        -I$(srctree)/arch/$(hdr-arch)/include \
368        -Iarch/$(hdr-arch)/include/generated \
369        $(if $(KBUILD_SRC), -I$(srctree)/include) \
370        -Iinclude \
371        $(USERINCLUDE)
372
373KBUILD_CPPFLAGS := -D__KERNEL__
374
375KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
376           -fno-strict-aliasing -fno-common \
377           -Werror-implicit-function-declaration \
378           -Wno-format-security \
379           -fno-delete-null-pointer-checks
380KBUILD_AFLAGS_KERNEL :=
381KBUILD_CFLAGS_KERNEL :=
382KBUILD_AFLAGS := -D__ASSEMBLY__
383KBUILD_AFLAGS_MODULE := -DMODULE
384KBUILD_CFLAGS_MODULE := -DMODULE
385KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
386
387# Read KERNELRELEASE from include/config/kernel.release (if it exists)
388KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
389KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
390
391export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
392export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
393export CPP AR NM STRIP OBJCOPY OBJDUMP
394export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
395export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
396
397export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
398export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
399export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
400export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
401export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
402export KBUILD_ARFLAGS
403
404# When compiling out-of-tree modules, put MODVERDIR in the module
405# tree rather than in the kernel tree. The kernel tree might
406# even be read-only.
407export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
408
409# Files to ignore in find ... statements
410
411RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \
412           -o -name .pc -o -name .hg -o -name .git \) -prune -o
413export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
414             --exclude CVS --exclude .pc --exclude .hg --exclude .git
415
416# ===========================================================================
417# Rules shared between *config targets and build targets
418
419# Basic helpers built in scripts/
420PHONY += scripts_basic
421scripts_basic:
422    $(Q)$(MAKE) $(build)=scripts/basic
423    $(Q)rm -f .tmp_quiet_recordmcount
424
425# To avoid any implicit rule to kick in, define an empty command.
426scripts/basic/%: scripts_basic ;
427
428PHONY += outputmakefile
429# outputmakefile generates a Makefile in the output directory, if using a
430# separate output directory. This allows convenient use of make in the
431# output directory.
432outputmakefile:
433ifneq ($(KBUILD_SRC),)
434    $(Q)ln -fsn $(srctree) source
435    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
436        $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
437endif
438
439# Support for using generic headers in asm-generic
440PHONY += asm-generic
441asm-generic:
442    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
443                src=asm obj=arch/$(SRCARCH)/include/generated/asm
444    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
445                src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
446
447# To make sure we do not include .config for any of the *config targets
448# catch them early, and hand them over to scripts/kconfig/Makefile
449# It is allowed to specify more targets when calling make, including
450# mixing *config targets and build targets.
451# For example 'make oldconfig all'.
452# Detect when mixed targets is specified, and make a second invocation
453# of make so .config is not included in this case either (for *config).
454
455version_h := include/generated/uapi/linux/version.h
456
457no-dot-config-targets := clean mrproper distclean \
458             cscope gtags TAGS tags help %docs check% coccicheck \
459             $(version_h) headers_% archheaders archscripts \
460             kernelversion %src-pkg
461
462config-targets := 0
463mixed-targets := 0
464dot-config := 1
465
466ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
467    ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
468        dot-config := 0
469    endif
470endif
471
472ifeq ($(KBUILD_EXTMOD),)
473        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
474                config-targets := 1
475                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
476                        mixed-targets := 1
477                endif
478        endif
479endif
480
481ifeq ($(mixed-targets),1)
482# ===========================================================================
483# We're called with mixed targets (*config and build targets).
484# Handle them one by one.
485
486%:: FORCE
487    $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
488
489else
490ifeq ($(config-targets),1)
491# ===========================================================================
492# *config targets only - make sure prerequisites are updated, and descend
493# in scripts/kconfig to make the *config target
494
495# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
496# KBUILD_DEFCONFIG may point out an alternative default configuration
497# used for 'make defconfig'
498include $(srctree)/arch/$(SRCARCH)/Makefile
499export KBUILD_DEFCONFIG KBUILD_KCONFIG
500
501config: scripts_basic outputmakefile FORCE
502    $(Q)mkdir -p include/linux include/config
503    $(Q)$(MAKE) $(build)=scripts/kconfig $@
504
505%config: scripts_basic outputmakefile FORCE
506    $(Q)mkdir -p include/linux include/config
507    $(Q)$(MAKE) $(build)=scripts/kconfig $@
508
509else
510# ===========================================================================
511# Build targets only - this includes vmlinux, arch specific targets, clean
512# targets and others. In general all targets except *config targets.
513
514ifeq ($(KBUILD_EXTMOD),)
515# Additional helpers built in scripts/
516# Carefully list dependencies so we do not try to build scripts twice
517# in parallel
518PHONY += scripts
519scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
520     asm-generic
521    $(Q)$(MAKE) $(build)=$(@)
522
523# Objects we will link into vmlinux / subdirs we need to visit
524init-y := init/
525drivers-y := drivers/ sound/ firmware/
526net-y := net/
527libs-y := lib/
528core-y := usr/
529endif # KBUILD_EXTMOD
530
531ifeq ($(dot-config),1)
532# Read in config
533-include include/config/auto.conf
534
535ifeq ($(KBUILD_EXTMOD),)
536# Read in dependencies to all Kconfig* files, make sure to run
537# oldconfig if changes are detected.
538-include include/config/auto.conf.cmd
539
540# To avoid any implicit rule to kick in, define an empty command
541$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
542
543# If .config is newer than include/config/auto.conf, someone tinkered
544# with it and forgot to run make oldconfig.
545# if auto.conf.cmd is missing then we are probably in a cleaned tree so
546# we execute the config step to be sure to catch updated Kconfig files
547include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
548    $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
549else
550# external modules needs include/generated/autoconf.h and include/config/auto.conf
551# but do not care if they are up-to-date. Use auto.conf to trigger the test
552PHONY += include/config/auto.conf
553
554include/config/auto.conf:
555    $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
556    echo >&2; \
557    echo >&2 " ERROR: Kernel configuration is invalid."; \
558    echo >&2 " include/generated/autoconf.h or $@ are missing.";\
559    echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
560    echo >&2 ; \
561    /bin/false)
562
563endif # KBUILD_EXTMOD
564
565else
566# Dummy target needed, because used as prerequisite
567include/config/auto.conf: ;
568endif # $(dot-config)
569
570# The all: target is the default when no target is given on the
571# command line.
572# This allow a user to issue only 'make' to build a kernel including modules
573# Defaults to vmlinux, but the arch makefile usually adds further targets
574all: vmlinux
575
576ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
577KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
578else
579KBUILD_CFLAGS += -O2
580endif
581
582include $(srctree)/arch/$(SRCARCH)/Makefile
583
584ifdef CONFIG_READABLE_ASM
585# Disable optimizations that make assembler listings hard to read.
586# reorder blocks reorders the control in the function
587# ipa clone creates specialized cloned functions
588# partial inlining inlines only parts of functions
589KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
590                 $(call cc-option,-fno-ipa-cp-clone,) \
591                 $(call cc-option,-fno-partial-inlining)
592endif
593
594ifneq ($(CONFIG_FRAME_WARN),0)
595KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
596endif
597
598# Force gcc to behave correct even for buggy distributions
599ifndef CONFIG_CC_STACKPROTECTOR
600KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
601endif
602
603# This warning generated too much noise in a regular build.
604# Use make W=1 to enable this warning (see scripts/Makefile.build)
605KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
606
607ifdef CONFIG_FRAME_POINTER
608KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
609else
610# Some targets (ARM with Thumb2, for example), can't be built with frame
611# pointers. For those, we don't have FUNCTION_TRACER automatically
612# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
613# incompatible with -fomit-frame-pointer with current GCC, so we don't use
614# -fomit-frame-pointer with FUNCTION_TRACER.
615ifndef CONFIG_FUNCTION_TRACER
616KBUILD_CFLAGS += -fomit-frame-pointer
617endif
618endif
619
620ifdef CONFIG_DEBUG_INFO
621KBUILD_CFLAGS += -g
622KBUILD_AFLAGS += -gdwarf-2
623endif
624
625ifdef CONFIG_DEBUG_INFO_REDUCED
626KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
627           $(call cc-option,-fno-var-tracking)
628endif
629
630ifdef CONFIG_FUNCTION_TRACER
631ifdef CONFIG_HAVE_FENTRY
632CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
633endif
634KBUILD_CFLAGS += -pg $(CC_USING_FENTRY)
635KBUILD_AFLAGS += $(CC_USING_FENTRY)
636ifdef CONFIG_DYNAMIC_FTRACE
637    ifdef CONFIG_HAVE_C_RECORDMCOUNT
638        BUILD_C_RECORDMCOUNT := y
639        export BUILD_C_RECORDMCOUNT
640    endif
641endif
642endif
643
644# We trigger additional mismatches with less inlining
645ifdef CONFIG_DEBUG_SECTION_MISMATCH
646KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
647endif
648
649# arch Makefile may override CC so keep this after arch Makefile is included
650NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
651CHECKFLAGS += $(NOSTDINC_FLAGS)
652
653# warn about C99 declaration after statement
654KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
655
656# disable pointer signed / unsigned warnings in gcc 4.0
657KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
658
659# disable invalid "can't wrap" optimizations for signed / pointers
660KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
661
662# conserve stack if available
663KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
664
665# disallow errors like 'EXPORT_GPL(foo);' with missing header
666KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
667
668# require functions to have arguments in prototypes, not empty 'int foo()'
669KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
670
671# use the deterministic mode of AR if available
672KBUILD_ARFLAGS := $(call ar-option,D)
673
674# check for 'asm goto'
675ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
676    KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
677endif
678
679# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
680KBUILD_CPPFLAGS += $(KCPPFLAGS)
681KBUILD_AFLAGS += $(KAFLAGS)
682KBUILD_CFLAGS += $(KCFLAGS)
683
684# Use --build-id when available.
685LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
686                  $(call cc-ldoption, -Wl$(comma)--build-id,))
687KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
688LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
689
690ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
691LDFLAGS_vmlinux += $(call ld-option, -X,)
692endif
693
694# Default kernel image to build when no specific target is given.
695# KBUILD_IMAGE may be overruled on the command line or
696# set in the environment
697# Also any assignments in arch/$(ARCH)/Makefile take precedence over
698# this default value
699export KBUILD_IMAGE ?= vmlinux
700
701#
702# INSTALL_PATH specifies where to place the updated kernel and system map
703# images. Default is /boot, but you can set it to other values
704export INSTALL_PATH ?= /boot
705
706#
707# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
708# relocations required by build roots. This is not defined in the
709# makefile but the argument can be passed to make if needed.
710#
711
712MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
713export MODLIB
714
715#
716# INSTALL_MOD_STRIP, if defined, will cause modules to be
717# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
718# the default option --strip-debug will be used. Otherwise,
719# INSTALL_MOD_STRIP value will be used as the options to the strip command.
720
721ifdef INSTALL_MOD_STRIP
722ifeq ($(INSTALL_MOD_STRIP),1)
723mod_strip_cmd = $(STRIP) --strip-debug
724else
725mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
726endif # INSTALL_MOD_STRIP=1
727else
728mod_strip_cmd = true
729endif # INSTALL_MOD_STRIP
730export mod_strip_cmd
731
732# Select initial ramdisk compression format, default is gzip(1).
733# This shall be used by the dracut(8) tool while creating an initramfs image.
734#
735INITRD_COMPRESS-y := gzip
736INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
737INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
738INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
739INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
740INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
741# do not export INITRD_COMPRESS, since we didn't actually
742# choose a sane default compression above.
743# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
744
745ifdef CONFIG_MODULE_SIG_ALL
746MODSECKEY = ./signing_key.priv
747MODPUBKEY = ./signing_key.x509
748export MODPUBKEY
749mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
750else
751mod_sign_cmd = true
752endif
753export mod_sign_cmd
754
755
756ifeq ($(KBUILD_EXTMOD),)
757core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
758
759vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
760             $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
761             $(net-y) $(net-m) $(libs-y) $(libs-m)))
762
763vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
764             $(init-n) $(init-) \
765             $(core-n) $(core-) $(drivers-n) $(drivers-) \
766             $(net-n) $(net-) $(libs-n) $(libs-))))
767
768init-y := $(patsubst %/, %/built-in.o, $(init-y))
769core-y := $(patsubst %/, %/built-in.o, $(core-y))
770drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
771net-y := $(patsubst %/, %/built-in.o, $(net-y))
772libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
773libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
774libs-y := $(libs-y1) $(libs-y2)
775
776# Externally visible symbols (used by link-vmlinux.sh)
777export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
778export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
779export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
780export LDFLAGS_vmlinux
781# used by scripts/pacmage/Makefile
782export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
783
784vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
785
786# Final link of vmlinux
787      cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
788quiet_cmd_link-vmlinux = LINK $@
789
790# Include targets which we want to
791# execute if the rest of the kernel build went well.
792vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
793ifdef CONFIG_HEADERS_CHECK
794    $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
795endif
796ifdef CONFIG_SAMPLES
797    $(Q)$(MAKE) $(build)=samples
798endif
799ifdef CONFIG_BUILD_DOCSRC
800    $(Q)$(MAKE) $(build)=Documentation
801endif
802    +$(call if_changed,link-vmlinux)
803
804# The actual objects are generated when descending,
805# make sure no implicit rule kicks in
806$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
807
808# Handle descending into subdirectories listed in $(vmlinux-dirs)
809# Preset locale variables to speed up the build process. Limit locale
810# tweaks to this spot to avoid wrong language settings when running
811# make menuconfig etc.
812# Error messages still appears in the original language
813
814PHONY += $(vmlinux-dirs)
815$(vmlinux-dirs): prepare scripts
816    $(Q)$(MAKE) $(build)=$@
817
818define filechk_kernel.release
819    echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
820endef
821
822# Store (new) KERNELRELEASE string in include/config/kernel.release
823include/config/kernel.release: include/config/auto.conf FORCE
824    $(call filechk,kernel.release)
825
826
827# Things we need to do before we recursively start building the kernel
828# or the modules are listed in "prepare".
829# A multi level approach is used. prepareN is processed before prepareN-1.
830# archprepare is used in arch Makefiles and when processed asm symlink,
831# version.h and scripts_basic is processed / created.
832
833# Listed in dependency order
834PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
835
836# prepare3 is used to check if we are building in a separate output directory,
837# and if so do:
838# 1) Check that make has not been executed in the kernel src $(srctree)
839prepare3: include/config/kernel.release
840ifneq ($(KBUILD_SRC),)
841    @$(kecho) ' Using $(srctree) as source for kernel'
842    $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
843        echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
844        echo >&2 " in the '$(srctree)' directory.";\
845        /bin/false; \
846    fi;
847endif
848
849# prepare2 creates a makefile if using a separate output directory
850prepare2: prepare3 outputmakefile asm-generic
851
852prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
853                   include/config/auto.conf
854    $(cmd_crmodverdir)
855
856archprepare: archheaders archscripts prepare1 scripts_basic
857
858prepare0: archprepare FORCE
859    $(Q)$(MAKE) $(build)=.
860
861# All the preparing..
862prepare: prepare0
863
864# Generate some files
865# ---------------------------------------------------------------------------
866
867# KERNELRELEASE can change from a few different places, meaning version.h
868# needs to be updated, so this check is forced on all builds
869
870uts_len := 64
871define filechk_utsrelease.h
872    if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
873      echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
874      exit 1; \
875    fi; \
876    (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
877endef
878
879define filechk_version.h
880    (echo \#define LINUX_VERSION_CODE $(shell \
881    expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
882    echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
883endef
884
885$(version_h): $(srctree)/Makefile FORCE
886    $(call filechk,version.h)
887
888include/generated/utsrelease.h: include/config/kernel.release FORCE
889    $(call filechk,utsrelease.h)
890
891PHONY += headerdep
892headerdep:
893    $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
894    $(srctree)/scripts/headerdep.pl -I$(srctree)/include
895
896# ---------------------------------------------------------------------------
897
898PHONY += depend dep
899depend dep:
900    @echo '*** Warning: make $@ is unnecessary now.'
901
902# ---------------------------------------------------------------------------
903# Firmware install
904INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
905export INSTALL_FW_PATH
906
907PHONY += firmware_install
908firmware_install: FORCE
909    @mkdir -p $(objtree)/firmware
910    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
911
912# ---------------------------------------------------------------------------
913# Kernel headers
914
915#Default location for installed headers
916export INSTALL_HDR_PATH = $(objtree)/usr
917
918hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
919
920# If we do an all arch process set dst to asm-$(hdr-arch)
921hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
922
923PHONY += archheaders
924archheaders:
925
926PHONY += archscripts
927archscripts:
928
929PHONY += __headers
930__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
931    $(Q)$(MAKE) $(build)=scripts build_unifdef
932
933PHONY += headers_install_all
934headers_install_all:
935    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
936
937PHONY += headers_install
938headers_install: __headers
939    $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
940      $(error Headers not exportable for the $(SRCARCH) architecture))
941    $(Q)$(MAKE) $(hdr-inst)=include/uapi
942    $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
943
944PHONY += headers_check_all
945headers_check_all: headers_install_all
946    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
947
948PHONY += headers_check
949headers_check: headers_install
950    $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
951    $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
952
953# ---------------------------------------------------------------------------
954# Modules
955
956ifdef CONFIG_MODULES
957
958# By default, build modules as well
959
960all: modules
961
962# Build modules
963#
964# A module can be listed more than once in obj-m resulting in
965# duplicate lines in modules.order files. Those are removed
966# using awk while concatenating to the final file.
967
968PHONY += modules
969modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
970    $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
971    @$(kecho) ' Building modules, stage 2.';
972    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
973    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
974
975modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
976    $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
977
978%/modules.builtin: include/config/auto.conf
979    $(Q)$(MAKE) $(modbuiltin)=$*
980
981
982# Target to prepare building external modules
983PHONY += modules_prepare
984modules_prepare: prepare scripts
985
986# Target to install modules
987PHONY += modules_install
988modules_install: _modinst_ _modinst_post
989
990PHONY += _modinst_
991_modinst_:
992    @rm -rf $(MODLIB)/kernel
993    @rm -f $(MODLIB)/source
994    @mkdir -p $(MODLIB)/kernel
995    @ln -s $(srctree) $(MODLIB)/source
996    @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
997        rm -f $(MODLIB)/build ; \
998        ln -s $(objtree) $(MODLIB)/build ; \
999    fi
1000    @cp -f $(objtree)/modules.order $(MODLIB)/
1001    @cp -f $(objtree)/modules.builtin $(MODLIB)/
1002    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1003
1004# This depmod is only for convenience to give the initial
1005# boot a modules.dep even before / is mounted read-write. However the
1006# boot script depmod is the master version.
1007PHONY += _modinst_post
1008_modinst_post: _modinst_
1009    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1010    $(call cmd,depmod)
1011
1012ifeq ($(CONFIG_MODULE_SIG), y)
1013PHONY += modules_sign
1014modules_sign:
1015    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1016endif
1017
1018else # CONFIG_MODULES
1019
1020# Modules not configured
1021# ---------------------------------------------------------------------------
1022
1023modules modules_install: FORCE
1024    @echo >&2
1025    @echo >&2 "The present kernel configuration has modules disabled."
1026    @echo >&2 "Type 'make config' and enable loadable module support."
1027    @echo >&2 "Then build a kernel with module support enabled."
1028    @echo >&2
1029    @exit 1
1030
1031endif # CONFIG_MODULES
1032
1033###
1034# Cleaning is done on three levels.
1035# make clean Delete most generated files
1036# Leave enough to build external modules
1037# make mrproper Delete the current configuration, and all generated files
1038# make distclean Remove editor backup files, patch leftover files and the like
1039
1040# Directories & files removed with 'make clean'
1041CLEAN_DIRS += $(MODVERDIR)
1042
1043# Directories & files removed with 'make mrproper'
1044MRPROPER_DIRS += include/config usr/include include/generated \
1045                  arch/*/include/generated
1046MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1047          Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1048          signing_key.priv signing_key.x509 x509.genkey \
1049          extra_certificates signing_key.x509.keyid \
1050          signing_key.x509.signer
1051
1052# clean - Delete most, but leave enough to build external modules
1053#
1054clean: rm-dirs := $(CLEAN_DIRS)
1055clean: rm-files := $(CLEAN_FILES)
1056clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1057
1058PHONY += $(clean-dirs) clean archclean vmlinuxclean
1059$(clean-dirs):
1060    $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1061
1062vmlinuxclean:
1063    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1064
1065clean: archclean vmlinuxclean
1066
1067# mrproper - Delete all generated files, including .config
1068#
1069mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1070mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1071mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1072
1073PHONY += $(mrproper-dirs) mrproper archmrproper
1074$(mrproper-dirs):
1075    $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1076
1077mrproper: clean archmrproper $(mrproper-dirs)
1078    $(call cmd,rmdirs)
1079    $(call cmd,rmfiles)
1080
1081# distclean
1082#
1083PHONY += distclean
1084
1085distclean: mrproper
1086    @find $(srctree) $(RCS_FIND_IGNORE) \
1087        \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1088        -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1089        -o -name '.*.rej' \
1090        -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1091        -type f -print | xargs rm -f
1092
1093
1094# Packaging of the kernel to various formats
1095# ---------------------------------------------------------------------------
1096# rpm target kept for backward compatibility
1097package-dir := $(srctree)/scripts/package
1098
1099%src-pkg: FORCE
1100    $(Q)$(MAKE) $(build)=$(package-dir) $@
1101%pkg: include/config/kernel.release FORCE
1102    $(Q)$(MAKE) $(build)=$(package-dir) $@
1103rpm: include/config/kernel.release FORCE
1104    $(Q)$(MAKE) $(build)=$(package-dir) $@
1105
1106
1107# Brief documentation of the typical targets used
1108# ---------------------------------------------------------------------------
1109
1110boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1111boards := $(notdir $(boards))
1112board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1113board-dirs := $(sort $(notdir $(board-dirs:/=)))
1114
1115help:
1116    @echo 'Cleaning targets:'
1117    @echo ' clean - Remove most generated files but keep the config and'
1118    @echo ' enough build support to build external modules'
1119    @echo ' mrproper - Remove all generated files + config + various backup files'
1120    @echo ' distclean - mrproper + remove editor backup and patch files'
1121    @echo ''
1122    @echo 'Configuration targets:'
1123    @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1124    @echo ''
1125    @echo 'Other generic targets:'
1126    @echo ' all - Build all targets marked with [*]'
1127    @echo '* vmlinux - Build the bare kernel'
1128    @echo '* modules - Build all modules'
1129    @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1130    @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1131    @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1132    @echo ' dir/ - Build all files in dir and below'
1133    @echo ' dir/file.[oisS] - Build specified target only'
1134    @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1135    @echo ' (requires a recent binutils and recent build (System.map))'
1136    @echo ' dir/file.ko - Build module including final link'
1137    @echo ' modules_prepare - Set up for building external modules'
1138    @echo ' tags/TAGS - Generate tags file for editors'
1139    @echo ' cscope - Generate cscope index'
1140    @echo ' gtags - Generate GNU GLOBAL index'
1141    @echo ' kernelrelease - Output the release version string'
1142    @echo ' kernelversion - Output the version stored in Makefile'
1143    @echo ' image_name - Output the image name'
1144    @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1145     echo ' (default: $(INSTALL_HDR_PATH))'; \
1146     echo ''
1147    @echo 'Static analysers'
1148    @echo ' checkstack - Generate a list of stack hogs'
1149    @echo ' namespacecheck - Name space analysis on compiled kernel'
1150    @echo ' versioncheck - Sanity check on version.h usage'
1151    @echo ' includecheck - Check for duplicate included header files'
1152    @echo ' export_report - List the usages of all exported symbols'
1153    @echo ' headers_check - Sanity check on exported headers'
1154    @echo ' headerdep - Detect inclusion cycles in headers'
1155    @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1156    @echo ''
1157    @echo 'Kernel packaging:'
1158    @$(MAKE) $(build)=$(package-dir) help
1159    @echo ''
1160    @echo 'Documentation targets:'
1161    @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1162    @echo ''
1163    @echo 'Architecture specific targets ($(SRCARCH)):'
1164    @$(if $(archhelp),$(archhelp),\
1165        echo ' No architecture specific help defined for $(SRCARCH)')
1166    @echo ''
1167    @$(if $(boards), \
1168        $(foreach b, $(boards), \
1169        printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1170        echo '')
1171    @$(if $(board-dirs), \
1172        $(foreach b, $(board-dirs), \
1173        printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1174        printf " %-16s - Show all of the above\\n" help-boards; \
1175        echo '')
1176
1177    @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1178    @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1179    @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1180    @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1181    @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1182    @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1183    @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1184    @echo ' 1: warnings which may be relevant and do not occur too often'
1185    @echo ' 2: warnings which occur quite often but may still be relevant'
1186    @echo ' 3: more obscure warnings, can most likely be ignored'
1187    @echo ' Multiple levels can be combined with W=12 or W=123'
1188    @echo ''
1189    @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1190    @echo 'For further info see the ./README file'
1191
1192
1193help-board-dirs := $(addprefix help-,$(board-dirs))
1194
1195help-boards: $(help-board-dirs)
1196
1197boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1198
1199$(help-board-dirs): help-%:
1200    @echo 'Architecture specific targets ($(SRCARCH) $*):'
1201    @$(if $(boards-per-dir), \
1202        $(foreach b, $(boards-per-dir), \
1203        printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1204        echo '')
1205
1206
1207# Documentation targets
1208# ---------------------------------------------------------------------------
1209%docs: scripts_basic FORCE
1210    $(Q)$(MAKE) $(build)=scripts build_docproc
1211    $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1212
1213else # KBUILD_EXTMOD
1214
1215###
1216# External module support.
1217# When building external modules the kernel used as basis is considered
1218# read-only, and no consistency checks are made and the make
1219# system is not used on the basis kernel. If updates are required
1220# in the basis kernel ordinary make commands (without M=...) must
1221# be used.
1222#
1223# The following are the only valid targets when building external
1224# modules.
1225# make M=dir clean Delete all automatically generated files
1226# make M=dir modules Make all modules in specified dir
1227# make M=dir Same as 'make M=dir modules'
1228# make M=dir modules_install
1229# Install the modules built in the module directory
1230# Assumes install directory is already created
1231
1232# We are always building modules
1233KBUILD_MODULES := 1
1234PHONY += crmodverdir
1235crmodverdir:
1236    $(cmd_crmodverdir)
1237
1238PHONY += $(objtree)/Module.symvers
1239$(objtree)/Module.symvers:
1240    @test -e $(objtree)/Module.symvers || ( \
1241    echo; \
1242    echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1243    echo " is missing; modules will have no dependencies and modversions."; \
1244    echo )
1245
1246module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1247PHONY += $(module-dirs) modules
1248$(module-dirs): crmodverdir $(objtree)/Module.symvers
1249    $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1250
1251modules: $(module-dirs)
1252    @$(kecho) ' Building modules, stage 2.';
1253    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1254
1255PHONY += modules_install
1256modules_install: _emodinst_ _emodinst_post
1257
1258install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1259PHONY += _emodinst_
1260_emodinst_:
1261    $(Q)mkdir -p $(MODLIB)/$(install-dir)
1262    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1263
1264PHONY += _emodinst_post
1265_emodinst_post: _emodinst_
1266    $(call cmd,depmod)
1267
1268clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1269
1270PHONY += $(clean-dirs) clean
1271$(clean-dirs):
1272    $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1273
1274clean: rm-dirs := $(MODVERDIR)
1275clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1276
1277help:
1278    @echo ' Building external modules.'
1279    @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1280    @echo ''
1281    @echo ' modules - default target, build the module(s)'
1282    @echo ' modules_install - install the module'
1283    @echo ' clean - remove generated files in module directory only'
1284    @echo ''
1285
1286# Dummies...
1287PHONY += prepare scripts
1288prepare: ;
1289scripts: ;
1290endif # KBUILD_EXTMOD
1291
1292clean: $(clean-dirs)
1293    $(call cmd,rmdirs)
1294    $(call cmd,rmfiles)
1295    @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1296        \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1297        -o -name '*.ko.*' \
1298        -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1299        -o -name '*.symtypes' -o -name 'modules.order' \
1300        -o -name modules.builtin -o -name '.tmp_*.o.*' \
1301        -o -name '*.gcno' \) -type f -print | xargs rm -f
1302
1303# Generate tags for editors
1304# ---------------------------------------------------------------------------
1305quiet_cmd_tags = GEN $@
1306      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1307
1308tags TAGS cscope gtags: FORCE
1309    $(call cmd,tags)
1310
1311# Scripts to check various things for consistency
1312# ---------------------------------------------------------------------------
1313
1314PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1315
1316includecheck:
1317    find $(srctree)/* $(RCS_FIND_IGNORE) \
1318        -name '*.[hcS]' -type f -print | sort \
1319        | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1320
1321versioncheck:
1322    find $(srctree)/* $(RCS_FIND_IGNORE) \
1323        -name '*.[hcS]' -type f -print | sort \
1324        | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1325
1326coccicheck:
1327    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1328
1329namespacecheck:
1330    $(PERL) $(srctree)/scripts/namespace.pl
1331
1332export_report:
1333    $(PERL) $(srctree)/scripts/export_report.pl
1334
1335endif #ifeq ($(config-targets),1)
1336endif #ifeq ($(mixed-targets),1)
1337
1338PHONY += checkstack kernelrelease kernelversion image_name
1339
1340# UML needs a little special treatment here. It wants to use the host
1341# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1342# else wants $(ARCH), including people doing cross-builds, which means
1343# that $(SUBARCH) doesn't work here.
1344ifeq ($(ARCH), um)
1345CHECKSTACK_ARCH := $(SUBARCH)
1346else
1347CHECKSTACK_ARCH := $(ARCH)
1348endif
1349checkstack:
1350    $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1351    $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1352
1353kernelrelease:
1354    @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1355
1356kernelversion:
1357    @echo $(KERNELVERSION)
1358
1359image_name:
1360    @echo $(KBUILD_IMAGE)
1361
1362# Clear a bunch of variables before executing the submake
1363tools/: FORCE
1364    $(Q)mkdir -p $(objtree)/tools
1365    $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1366
1367tools/%: FORCE
1368    $(Q)mkdir -p $(objtree)/tools
1369    $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1370
1371# Single targets
1372# ---------------------------------------------------------------------------
1373# Single targets are compatible with:
1374# - build with mixed source and output
1375# - build with separate output dir 'make O=...'
1376# - external modules
1377#
1378# target-dir => where to store outputfile
1379# build-dir => directory in kernel source tree to use
1380
1381ifeq ($(KBUILD_EXTMOD),)
1382        build-dir = $(patsubst %/,%,$(dir $@))
1383        target-dir = $(dir $@)
1384else
1385        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1386        build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1387        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1388endif
1389
1390%.s: %.c prepare scripts FORCE
1391    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1392%.i: %.c prepare scripts FORCE
1393    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1394%.o: %.c prepare scripts FORCE
1395    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1396%.lst: %.c prepare scripts FORCE
1397    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1398%.s: %.S prepare scripts FORCE
1399    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1400%.o: %.S prepare scripts FORCE
1401    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1402%.symtypes: %.c prepare scripts FORCE
1403    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1404
1405# Modules
1406/: prepare scripts FORCE
1407    $(cmd_crmodverdir)
1408    $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1409    $(build)=$(build-dir)
1410%/: prepare scripts FORCE
1411    $(cmd_crmodverdir)
1412    $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1413    $(build)=$(build-dir)
1414%.ko: prepare scripts FORCE
1415    $(cmd_crmodverdir)
1416    $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1417    $(build)=$(build-dir) $(@:.ko=.o)
1418    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1419
1420# FIXME Should go into a make.lib or something
1421# ===========================================================================
1422
1423quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1424      cmd_rmdirs = rm -rf $(rm-dirs)
1425
1426quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1427      cmd_rmfiles = rm -f $(rm-files)
1428
1429# Run depmod only if we have System.map and depmod is executable
1430quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1431      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1432                   $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1433
1434# Create temporary dir for module support files
1435# clean it up only when building all modules
1436cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1437                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1438
1439# read all saved command lines
1440
1441targets := $(wildcard $(sort $(targets)))
1442cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1443
1444ifneq ($(cmd_files),)
1445  $(cmd_files): ; # Do not try to update included dependency files
1446  include $(cmd_files)
1447endif
1448
1449# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1450# Usage:
1451# $(Q)$(MAKE) $(clean)=dir
1452clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1453
1454endif # skip-makefile
1455
1456PHONY += FORCE
1457FORCE:
1458
1459# Declare the contents of the .PHONY variable as phony. We keep that
1460# information in a variable so we can use it in if_changed and friends.
1461.PHONY: $(PHONY)
1462

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