projects/linux·blob v2.6.37-rc6 · refs

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1VERSION = 2
2PATCHLEVEL = 6
3SUBLEVEL = 37
4EXTRAVERSION = -rc6
5NAME = Flesh-Eating Bats with Fangs
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 := $(O)
103endif
104
105# That's our default target when none is given on the command line
106PHONY := _all
107_all:
108
109# Cancel implicit rules on top Makefile
110$(CURDIR)/Makefile Makefile: ;
111
112ifneq ($(KBUILD_OUTPUT),)
113# Invoke a second make in the output directory, passing relevant variables
114# check that the output directory actually exists
115saved-output := $(KBUILD_OUTPUT)
116KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
117$(if $(KBUILD_OUTPUT),, \
118 $(error output directory "$(saved-output)" does not exist))
119
120PHONY += $(MAKECMDGOALS) sub-make
121
122$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
123 $(Q)@:
124
125sub-make: FORCE
126 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
127 KBUILD_SRC=$(CURDIR) \
128 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
129 $(filter-out _all sub-make,$(MAKECMDGOALS))
130
131# Leave processing to above invocation of make
132skip-makefile := 1
133endif # ifneq ($(KBUILD_OUTPUT),)
134endif # ifeq ($(KBUILD_SRC),)
135
136# We process the rest of the Makefile if this is the final invocation of make
137ifeq ($(skip-makefile),)
138
139# If building an external module we do not care about the all: rule
140# but instead _all depend on modules
141PHONY += all
142ifeq ($(KBUILD_EXTMOD),)
143_all: all
144else
145_all: modules
146endif
147
148srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
149objtree := $(CURDIR)
150src := $(srctree)
151obj := $(objtree)
152
153VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
154
155export srctree objtree VPATH
156
157
158# SUBARCH tells the usermode build what the underlying arch is. That is set
159# first, and if a usermode build is happening, the "ARCH=um" on the command
160# line overrides the setting of ARCH below. If a native build is happening,
161# then ARCH is assigned, getting whatever value it gets normally, and
162# SUBARCH is subsequently ignored.
163
164SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
165 -e s/arm.*/arm/ -e s/sa110/arm/ \
166 -e s/s390x/s390/ -e s/parisc64/parisc/ \
167 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
168 -e s/sh[234].*/sh/ )
169
170# Cross compiling and selecting different set of gcc/bin-utils
171# ---------------------------------------------------------------------------
172#
173# When performing cross compilation for other architectures ARCH shall be set
174# to the target architecture. (See arch/* for the possibilities).
175# ARCH can be set during invocation of make:
176# make ARCH=ia64
177# Another way is to have ARCH set in the environment.
178# The default ARCH is the host where make is executed.
179
180# CROSS_COMPILE specify the prefix used for all executables used
181# during compilation. Only gcc and related bin-utils executables
182# are prefixed with $(CROSS_COMPILE).
183# CROSS_COMPILE can be set on the command line
184# make CROSS_COMPILE=ia64-linux-
185# Alternatively CROSS_COMPILE can be set in the environment.
186# A third alternative is to store a setting in .config so that plain
187# "make" in the configured kernel build directory always uses that.
188# Default value for CROSS_COMPILE is not to prefix executables
189# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
190export KBUILD_BUILDHOST := $(SUBARCH)
191ARCH ?= $(SUBARCH)
192CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
193
194# Architecture as present in compile.h
195UTS_MACHINE := $(ARCH)
196SRCARCH := $(ARCH)
197
198# Additional ARCH settings for x86
199ifeq ($(ARCH),i386)
200 SRCARCH := x86
201endif
202ifeq ($(ARCH),x86_64)
203 SRCARCH := x86
204endif
205
206# Additional ARCH settings for sparc
207ifeq ($(ARCH),sparc32)
208 SRCARCH := sparc
209endif
210ifeq ($(ARCH),sparc64)
211 SRCARCH := sparc
212endif
213
214# Additional ARCH settings for sh
215ifeq ($(ARCH),sh64)
216 SRCARCH := sh
217endif
218
219# Where to locate arch specific headers
220hdr-arch := $(SRCARCH)
221
222ifeq ($(ARCH),m68knommu)
223 hdr-arch := m68k
224endif
225
226KCONFIG_CONFIG ?= .config
227
228# SHELL used by kbuild
229CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
230 else if [ -x /bin/bash ]; then echo /bin/bash; \
231 else echo sh; fi ; fi)
232
233HOSTCC = gcc
234HOSTCXX = g++
235HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
236HOSTCXXFLAGS = -O2
237
238# Decide whether to build built-in, modular, or both.
239# Normally, just do built-in.
240
241KBUILD_MODULES :=
242KBUILD_BUILTIN := 1
243
244# If we have only "make modules", don't compile built-in objects.
245# When we're building modules with modversions, we need to consider
246# the built-in objects during the descend as well, in order to
247# make sure the checksums are up to date before we record them.
248
249ifeq ($(MAKECMDGOALS),modules)
250 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
251endif
252
253# If we have "make <whatever> modules", compile modules
254# in addition to whatever we do anyway.
255# Just "make" or "make all" shall build modules as well
256
257ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
258 KBUILD_MODULES := 1
259endif
260
261ifeq ($(MAKECMDGOALS),)
262 KBUILD_MODULES := 1
263endif
264
265export KBUILD_MODULES KBUILD_BUILTIN
266export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
267
268# Beautify output
269# ---------------------------------------------------------------------------
270#
271# Normally, we echo the whole command before executing it. By making
272# that echo $($(quiet)$(cmd)), we now have the possibility to set
273# $(quiet) to choose other forms of output instead, e.g.
274#
275# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
276# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
277#
278# If $(quiet) is empty, the whole command will be printed.
279# If it is set to "quiet_", only the short version will be printed.
280# If it is set to "silent_", nothing will be printed at all, since
281# the variable $(silent_cmd_cc_o_c) doesn't exist.
282#
283# A simple variant is to prefix commands with $(Q) - that's useful
284# for commands that shall be hidden in non-verbose mode.
285#
286# $(Q)ln $@ :<
287#
288# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
289# If KBUILD_VERBOSE equals 1 then the above command is displayed.
290
291ifeq ($(KBUILD_VERBOSE),1)
292 quiet =
293 Q =
294else
295 quiet=quiet_
296 Q = @
297endif
298
299# If the user is running make -s (silent mode), suppress echoing of
300# commands
301
302ifneq ($(findstring s,$(MAKEFLAGS)),)
303 quiet=silent_
304endif
305
306export quiet Q KBUILD_VERBOSE
307
308
309# Look for make include files relative to root of kernel src
310MAKEFLAGS += --include-dir=$(srctree)
311
312# We need some generic definitions (do not try to remake the file).
313$(srctree)/scripts/Kbuild.include: ;
314include $(srctree)/scripts/Kbuild.include
315
316# Make variables (CC, etc...)
317
318AS = $(CROSS_COMPILE)as
319LD = $(CROSS_COMPILE)ld
320CC = $(CROSS_COMPILE)gcc
321CPP = $(CC) -E
322AR = $(CROSS_COMPILE)ar
323NM = $(CROSS_COMPILE)nm
324STRIP = $(CROSS_COMPILE)strip
325OBJCOPY = $(CROSS_COMPILE)objcopy
326OBJDUMP = $(CROSS_COMPILE)objdump
327AWK = awk
328GENKSYMS = scripts/genksyms/genksyms
329INSTALLKERNEL := installkernel
330DEPMOD = /sbin/depmod
331KALLSYMS = scripts/kallsyms
332PERL = perl
333CHECK = sparse
334
335CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
336 -Wbitwise -Wno-return-void $(CF)
337CFLAGS_MODULE =
338AFLAGS_MODULE =
339LDFLAGS_MODULE =
340CFLAGS_KERNEL =
341AFLAGS_KERNEL =
342CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
343
344
345# Use LINUXINCLUDE when you must reference the include/ directory.
346# Needed to be compatible with the O= option
347LINUXINCLUDE := -I$(srctree)/arch/$(hdr-arch)/include -Iinclude \
348 $(if $(KBUILD_SRC), -I$(srctree)/include) \
349 -include include/generated/autoconf.h
350
351KBUILD_CPPFLAGS := -D__KERNEL__
352
353KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
354 -fno-strict-aliasing -fno-common \
355 -Werror-implicit-function-declaration \
356 -Wno-format-security \
357 -fno-delete-null-pointer-checks
358KBUILD_AFLAGS_KERNEL :=
359KBUILD_CFLAGS_KERNEL :=
360KBUILD_AFLAGS := -D__ASSEMBLY__
361KBUILD_AFLAGS_MODULE := -DMODULE
362KBUILD_CFLAGS_MODULE := -DMODULE
363KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
364
365# Read KERNELRELEASE from include/config/kernel.release (if it exists)
366KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
367KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
368
369export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
370export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
371export CPP AR NM STRIP OBJCOPY OBJDUMP
372export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
373export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
374
375export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
376export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
377export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
378export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
379export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
380
381# When compiling out-of-tree modules, put MODVERDIR in the module
382# tree rather than in the kernel tree. The kernel tree might
383# even be read-only.
384export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
385
386# Files to ignore in find ... statements
387
388RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
389export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
390
391# ===========================================================================
392# Rules shared between *config targets and build targets
393
394# Basic helpers built in scripts/
395PHONY += scripts_basic
396scripts_basic:
397 $(Q)$(MAKE) $(build)=scripts/basic
398 $(Q)rm -f .tmp_quiet_recordmcount
399
400# To avoid any implicit rule to kick in, define an empty command.
401scripts/basic/%: scripts_basic ;
402
403PHONY += outputmakefile
404# outputmakefile generates a Makefile in the output directory, if using a
405# separate output directory. This allows convenient use of make in the
406# output directory.
407outputmakefile:
408ifneq ($(KBUILD_SRC),)
409 $(Q)ln -fsn $(srctree) source
410 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
411 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
412endif
413
414# To make sure we do not include .config for any of the *config targets
415# catch them early, and hand them over to scripts/kconfig/Makefile
416# It is allowed to specify more targets when calling make, including
417# mixing *config targets and build targets.
418# For example 'make oldconfig all'.
419# Detect when mixed targets is specified, and make a second invocation
420# of make so .config is not included in this case either (for *config).
421
422no-dot-config-targets := clean mrproper distclean \
423 cscope TAGS tags help %docs check% coccicheck \
424 include/linux/version.h headers_% \
425 kernelversion %src-pkg
426
427config-targets := 0
428mixed-targets := 0
429dot-config := 1
430
431ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
432 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
433 dot-config := 0
434 endif
435endif
436
437ifeq ($(KBUILD_EXTMOD),)
438 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
439 config-targets := 1
440 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
441 mixed-targets := 1
442 endif
443 endif
444endif
445
446ifeq ($(mixed-targets),1)
447# ===========================================================================
448# We're called with mixed targets (*config and build targets).
449# Handle them one by one.
450
451%:: FORCE
452 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
453
454else
455ifeq ($(config-targets),1)
456# ===========================================================================
457# *config targets only - make sure prerequisites are updated, and descend
458# in scripts/kconfig to make the *config target
459
460# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
461# KBUILD_DEFCONFIG may point out an alternative default configuration
462# used for 'make defconfig'
463include $(srctree)/arch/$(SRCARCH)/Makefile
464export KBUILD_DEFCONFIG KBUILD_KCONFIG
465
466config: scripts_basic outputmakefile FORCE
467 $(Q)mkdir -p include/linux include/config
468 $(Q)$(MAKE) $(build)=scripts/kconfig $@
469
470%config: scripts_basic outputmakefile FORCE
471 $(Q)mkdir -p include/linux include/config
472 $(Q)$(MAKE) $(build)=scripts/kconfig $@
473
474else
475# ===========================================================================
476# Build targets only - this includes vmlinux, arch specific targets, clean
477# targets and others. In general all targets except *config targets.
478
479ifeq ($(KBUILD_EXTMOD),)
480# Additional helpers built in scripts/
481# Carefully list dependencies so we do not try to build scripts twice
482# in parallel
483PHONY += scripts
484scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
485 $(Q)$(MAKE) $(build)=$(@)
486
487# Objects we will link into vmlinux / subdirs we need to visit
488init-y := init/
489drivers-y := drivers/ sound/ firmware/
490net-y := net/
491libs-y := lib/
492core-y := usr/
493endif # KBUILD_EXTMOD
494
495ifeq ($(dot-config),1)
496# Read in config
497-include include/config/auto.conf
498
499ifeq ($(KBUILD_EXTMOD),)
500# Read in dependencies to all Kconfig* files, make sure to run
501# oldconfig if changes are detected.
502-include include/config/auto.conf.cmd
503
504# To avoid any implicit rule to kick in, define an empty command
505$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
506
507# If .config is newer than include/config/auto.conf, someone tinkered
508# with it and forgot to run make oldconfig.
509# if auto.conf.cmd is missing then we are probably in a cleaned tree so
510# we execute the config step to be sure to catch updated Kconfig files
511include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
512 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
513else
514# external modules needs include/generated/autoconf.h and include/config/auto.conf
515# but do not care if they are up-to-date. Use auto.conf to trigger the test
516PHONY += include/config/auto.conf
517
518include/config/auto.conf:
519 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
520 echo; \
521 echo " ERROR: Kernel configuration is invalid."; \
522 echo " include/generated/autoconf.h or $@ are missing.";\
523 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
524 echo; \
525 /bin/false)
526
527endif # KBUILD_EXTMOD
528
529else
530# Dummy target needed, because used as prerequisite
531include/config/auto.conf: ;
532endif # $(dot-config)
533
534# The all: target is the default when no target is given on the
535# command line.
536# This allow a user to issue only 'make' to build a kernel including modules
537# Defaults to vmlinux, but the arch makefile usually adds further targets
538all: vmlinux
539
540ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
541KBUILD_CFLAGS += -Os
542else
543KBUILD_CFLAGS += -O2
544endif
545
546include $(srctree)/arch/$(SRCARCH)/Makefile
547
548ifneq ($(CONFIG_FRAME_WARN),0)
549KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
550endif
551
552# Force gcc to behave correct even for buggy distributions
553ifndef CONFIG_CC_STACKPROTECTOR
554KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
555endif
556
557ifdef CONFIG_FRAME_POINTER
558KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
559else
560# Some targets (ARM with Thumb2, for example), can't be built with frame
561# pointers. For those, we don't have FUNCTION_TRACER automatically
562# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
563# incompatible with -fomit-frame-pointer with current GCC, so we don't use
564# -fomit-frame-pointer with FUNCTION_TRACER.
565ifndef CONFIG_FUNCTION_TRACER
566KBUILD_CFLAGS += -fomit-frame-pointer
567endif
568endif
569
570ifdef CONFIG_DEBUG_INFO
571KBUILD_CFLAGS += -g
572KBUILD_AFLAGS += -gdwarf-2
573endif
574
575ifdef CONFIG_DEBUG_INFO_REDUCED
576KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly)
577endif
578
579ifdef CONFIG_FUNCTION_TRACER
580KBUILD_CFLAGS += -pg
581ifdef CONFIG_DYNAMIC_FTRACE
582 ifdef CONFIG_HAVE_C_RECORDMCOUNT
583 BUILD_C_RECORDMCOUNT := y
584 export BUILD_C_RECORDMCOUNT
585 endif
586endif
587endif
588
589# We trigger additional mismatches with less inlining
590ifdef CONFIG_DEBUG_SECTION_MISMATCH
591KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
592endif
593
594# arch Makefile may override CC so keep this after arch Makefile is included
595NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
596CHECKFLAGS += $(NOSTDINC_FLAGS)
597
598# warn about C99 declaration after statement
599KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
600
601# disable pointer signed / unsigned warnings in gcc 4.0
602KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
603
604# disable invalid "can't wrap" optimizations for signed / pointers
605KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
606
607# conserve stack if available
608KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
609
610# check for 'asm goto'
611ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
612 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
613endif
614
615# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
616# But warn user when we do so
617warn-assign = \
618$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
619
620ifneq ($(KCPPFLAGS),)
621 $(call warn-assign,CPPFLAGS)
622 KBUILD_CPPFLAGS += $(KCPPFLAGS)
623endif
624ifneq ($(KAFLAGS),)
625 $(call warn-assign,AFLAGS)
626 KBUILD_AFLAGS += $(KAFLAGS)
627endif
628ifneq ($(KCFLAGS),)
629 $(call warn-assign,CFLAGS)
630 KBUILD_CFLAGS += $(KCFLAGS)
631endif
632
633# Use --build-id when available.
634LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
635 $(call cc-ldoption, -Wl$(comma)--build-id,))
636KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
637LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
638
639ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
640LDFLAGS_vmlinux += $(call ld-option, -X,)
641endif
642
643# Default kernel image to build when no specific target is given.
644# KBUILD_IMAGE may be overruled on the command line or
645# set in the environment
646# Also any assignments in arch/$(ARCH)/Makefile take precedence over
647# this default value
648export KBUILD_IMAGE ?= vmlinux
649
650#
651# INSTALL_PATH specifies where to place the updated kernel and system map
652# images. Default is /boot, but you can set it to other values
653export INSTALL_PATH ?= /boot
654
655#
656# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
657# relocations required by build roots. This is not defined in the
658# makefile but the argument can be passed to make if needed.
659#
660
661MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
662export MODLIB
663
664#
665# INSTALL_MOD_STRIP, if defined, will cause modules to be
666# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
667# the default option --strip-debug will be used. Otherwise,
668# INSTALL_MOD_STRIP will used as the options to the strip command.
669
670ifdef INSTALL_MOD_STRIP
671ifeq ($(INSTALL_MOD_STRIP),1)
672mod_strip_cmd = $(STRIP) --strip-debug
673else
674mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
675endif # INSTALL_MOD_STRIP=1
676else
677mod_strip_cmd = true
678endif # INSTALL_MOD_STRIP
679export mod_strip_cmd
680
681
682ifeq ($(KBUILD_EXTMOD),)
683core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
684
685vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
686 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
687 $(net-y) $(net-m) $(libs-y) $(libs-m)))
688
689vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
690 $(init-n) $(init-) \
691 $(core-n) $(core-) $(drivers-n) $(drivers-) \
692 $(net-n) $(net-) $(libs-n) $(libs-))))
693
694init-y := $(patsubst %/, %/built-in.o, $(init-y))
695core-y := $(patsubst %/, %/built-in.o, $(core-y))
696drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
697net-y := $(patsubst %/, %/built-in.o, $(net-y))
698libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
699libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
700libs-y := $(libs-y1) $(libs-y2)
701
702# Build vmlinux
703# ---------------------------------------------------------------------------
704# vmlinux is built from the objects selected by $(vmlinux-init) and
705# $(vmlinux-main). Most are built-in.o files from top-level directories
706# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
707# Ordering when linking is important, and $(vmlinux-init) must be first.
708#
709# vmlinux
710# ^
711# |
712# +-< $(vmlinux-init)
713# | +--< init/version.o + more
714# |
715# +--< $(vmlinux-main)
716# | +--< driver/built-in.o mm/built-in.o + more
717# |
718# +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
719#
720# vmlinux version (uname -v) cannot be updated during normal
721# descending-into-subdirs phase since we do not yet know if we need to
722# update vmlinux.
723# Therefore this step is delayed until just before final link of vmlinux -
724# except in the kallsyms case where it is done just before adding the
725# symbols to the kernel.
726#
727# System.map is generated to document addresses of all kernel symbols
728
729vmlinux-init := $(head-y) $(init-y)
730vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
731vmlinux-all := $(vmlinux-init) $(vmlinux-main)
732vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
733export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
734
735# Rule to link vmlinux - also used during CONFIG_KALLSYMS
736# May be overridden by arch/$(ARCH)/Makefile
737quiet_cmd_vmlinux__ ?= LD $@
738 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
739 -T $(vmlinux-lds) $(vmlinux-init) \
740 --start-group $(vmlinux-main) --end-group \
741 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
742
743# Generate new vmlinux version
744quiet_cmd_vmlinux_version = GEN .version
745 cmd_vmlinux_version = set -e; \
746 if [ ! -r .version ]; then \
747 rm -f .version; \
748 echo 1 >.version; \
749 else \
750 mv .version .old_version; \
751 expr 0$$(cat .old_version) + 1 >.version; \
752 fi; \
753 $(MAKE) $(build)=init
754
755# Generate System.map
756quiet_cmd_sysmap = SYSMAP
757 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
758
759# Link of vmlinux
760# If CONFIG_KALLSYMS is set .version is already updated
761# Generate System.map and verify that the content is consistent
762# Use + in front of the vmlinux_version rule to silent warning with make -j2
763# First command is ':' to allow us to use + in front of the rule
764define rule_vmlinux__
765 :
766 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
767
768 $(call cmd,vmlinux__)
769 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
770
771 $(Q)$(if $($(quiet)cmd_sysmap), \
772 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
773 $(cmd_sysmap) $@ System.map; \
774 if [ $$? -ne 0 ]; then \
775 rm -f $@; \
776 /bin/false; \
777 fi;
778 $(verify_kallsyms)
779endef
780
781
782ifdef CONFIG_KALLSYMS
783# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
784# It's a three stage process:
785# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
786# empty
787# Running kallsyms on that gives us .tmp_kallsyms1.o with
788# the right size - vmlinux version (uname -v) is updated during this step
789# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
790# but due to the added section, some addresses have shifted.
791# From here, we generate a correct .tmp_kallsyms2.o
792# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
793# o Verify that the System.map from vmlinux matches the map from
794# .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
795# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
796# .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
797# temporary bypass to allow the kernel to be built while the
798# maintainers work out what went wrong with kallsyms.
799
800ifdef CONFIG_KALLSYMS_EXTRA_PASS
801last_kallsyms := 3
802else
803last_kallsyms := 2
804endif
805
806kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
807
808define verify_kallsyms
809 $(Q)$(if $($(quiet)cmd_sysmap), \
810 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
811 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
812 $(Q)cmp -s System.map .tmp_System.map || \
813 (echo Inconsistent kallsyms data; \
814 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
815 rm .tmp_kallsyms* ; /bin/false )
816endef
817
818# Update vmlinux version before link
819# Use + in front of this rule to silent warning about make -j1
820# First command is ':' to allow us to use + in front of this rule
821cmd_ksym_ld = $(cmd_vmlinux__)
822define rule_ksym_ld
823 :
824 +$(call cmd,vmlinux_version)
825 $(call cmd,vmlinux__)
826 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
827endef
828
829# Generate .S file with all kernel symbols
830quiet_cmd_kallsyms = KSYM $@
831 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
832 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
833
834.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
835 $(call if_changed_dep,as_o_S)
836
837.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
838 $(call cmd,kallsyms)
839
840# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
841.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
842 $(call if_changed_rule,ksym_ld)
843
844.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
845 $(call if_changed,vmlinux__)
846
847.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
848 $(call if_changed,vmlinux__)
849
850# Needs to visit scripts/ before $(KALLSYMS) can be used.
851$(KALLSYMS): scripts ;
852
853# Generate some data for debugging strange kallsyms problems
854debug_kallsyms: .tmp_map$(last_kallsyms)
855
856.tmp_map%: .tmp_vmlinux% FORCE
857 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
858
859.tmp_map3: .tmp_map2
860
861.tmp_map2: .tmp_map1
862
863endif # ifdef CONFIG_KALLSYMS
864
865# Do modpost on a prelinked vmlinux. The finally linked vmlinux has
866# relevant sections renamed as per the linker script.
867quiet_cmd_vmlinux-modpost = LD $@
868 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
869 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
870 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
871define rule_vmlinux-modpost
872 :
873 +$(call cmd,vmlinux-modpost)
874 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
875 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
876endef
877
878# vmlinux image - including updated kernel symbols
879vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
880ifdef CONFIG_HEADERS_CHECK
881 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
882endif
883ifdef CONFIG_SAMPLES
884 $(Q)$(MAKE) $(build)=samples
885endif
886ifdef CONFIG_BUILD_DOCSRC
887 $(Q)$(MAKE) $(build)=Documentation
888endif
889 $(call vmlinux-modpost)
890 $(call if_changed_rule,vmlinux__)
891 $(Q)rm -f .old_version
892
893# build vmlinux.o first to catch section mismatch errors early
894ifdef CONFIG_KALLSYMS
895.tmp_vmlinux1: vmlinux.o
896endif
897
898modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
899vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
900 $(call if_changed_rule,vmlinux-modpost)
901
902# The actual objects are generated when descending,
903# make sure no implicit rule kicks in
904$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
905
906# Handle descending into subdirectories listed in $(vmlinux-dirs)
907# Preset locale variables to speed up the build process. Limit locale
908# tweaks to this spot to avoid wrong language settings when running
909# make menuconfig etc.
910# Error messages still appears in the original language
911
912PHONY += $(vmlinux-dirs)
913$(vmlinux-dirs): prepare scripts
914 $(Q)$(MAKE) $(build)=$@
915
916# Store (new) KERNELRELASE string in include/config/kernel.release
917include/config/kernel.release: include/config/auto.conf FORCE
918 $(Q)rm -f $@
919 $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
920
921
922# Things we need to do before we recursively start building the kernel
923# or the modules are listed in "prepare".
924# A multi level approach is used. prepareN is processed before prepareN-1.
925# archprepare is used in arch Makefiles and when processed asm symlink,
926# version.h and scripts_basic is processed / created.
927
928# Listed in dependency order
929PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
930
931# prepare3 is used to check if we are building in a separate output directory,
932# and if so do:
933# 1) Check that make has not been executed in the kernel src $(srctree)
934prepare3: include/config/kernel.release
935ifneq ($(KBUILD_SRC),)
936 @$(kecho) ' Using $(srctree) as source for kernel'
937 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
938 echo " $(srctree) is not clean, please run 'make mrproper'";\
939 echo " in the '$(srctree)' directory.";\
940 /bin/false; \
941 fi;
942endif
943
944# prepare2 creates a makefile if using a separate output directory
945prepare2: prepare3 outputmakefile
946
947prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
948 include/config/auto.conf
949 $(cmd_crmodverdir)
950
951archprepare: prepare1 scripts_basic
952
953prepare0: archprepare FORCE
954 $(Q)$(MAKE) $(build)=.
955 $(Q)$(MAKE) $(build)=. missing-syscalls
956
957# All the preparing..
958prepare: prepare0
959
960# Generate some files
961# ---------------------------------------------------------------------------
962
963# KERNELRELEASE can change from a few different places, meaning version.h
964# needs to be updated, so this check is forced on all builds
965
966uts_len := 64
967define filechk_utsrelease.h
968 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
969 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
970 exit 1; \
971 fi; \
972 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
973endef
974
975define filechk_version.h
976 (echo \#define LINUX_VERSION_CODE $(shell \
977 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
978 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
979endef
980
981include/linux/version.h: $(srctree)/Makefile FORCE
982 $(call filechk,version.h)
983
984include/generated/utsrelease.h: include/config/kernel.release FORCE
985 $(call filechk,utsrelease.h)
986
987PHONY += headerdep
988headerdep:
989 $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
990
991# ---------------------------------------------------------------------------
992
993PHONY += depend dep
994depend dep:
995 @echo '*** Warning: make $@ is unnecessary now.'
996
997# ---------------------------------------------------------------------------
998# Firmware install
999INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1000export INSTALL_FW_PATH
1001
1002PHONY += firmware_install
1003firmware_install: FORCE
1004 @mkdir -p $(objtree)/firmware
1005 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1006
1007# ---------------------------------------------------------------------------
1008# Kernel headers
1009
1010#Default location for installed headers
1011export INSTALL_HDR_PATH = $(objtree)/usr
1012
1013hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1014
1015# If we do an all arch process set dst to asm-$(hdr-arch)
1016hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1017
1018PHONY += __headers
1019__headers: include/linux/version.h scripts_basic FORCE
1020 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1021
1022PHONY += headers_install_all
1023headers_install_all:
1024 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1025
1026PHONY += headers_install
1027headers_install: __headers
1028 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1029 $(error Headers not exportable for the $(SRCARCH) architecture))
1030 $(Q)$(MAKE) $(hdr-inst)=include
1031 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1032
1033PHONY += headers_check_all
1034headers_check_all: headers_install_all
1035 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1036
1037PHONY += headers_check
1038headers_check: headers_install
1039 $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1040 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1041
1042# ---------------------------------------------------------------------------
1043# Modules
1044
1045ifdef CONFIG_MODULES
1046
1047# By default, build modules as well
1048
1049all: modules
1050
1051# Build modules
1052#
1053# A module can be listed more than once in obj-m resulting in
1054# duplicate lines in modules.order files. Those are removed
1055# using awk while concatenating to the final file.
1056
1057PHONY += modules
1058modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1059 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1060 @$(kecho) ' Building modules, stage 2.';
1061 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1062 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1063
1064modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1065 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1066
1067%/modules.builtin: include/config/auto.conf
1068 $(Q)$(MAKE) $(modbuiltin)=$*
1069
1070
1071# Target to prepare building external modules
1072PHONY += modules_prepare
1073modules_prepare: prepare scripts
1074
1075# Target to install modules
1076PHONY += modules_install
1077modules_install: _modinst_ _modinst_post
1078
1079PHONY += _modinst_
1080_modinst_:
1081 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1082 echo "Warning: you may need to install module-init-tools"; \
1083 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1084 sleep 1; \
1085 fi
1086 @rm -rf $(MODLIB)/kernel
1087 @rm -f $(MODLIB)/source
1088 @mkdir -p $(MODLIB)/kernel
1089 @ln -s $(srctree) $(MODLIB)/source
1090 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1091 rm -f $(MODLIB)/build ; \
1092 ln -s $(objtree) $(MODLIB)/build ; \
1093 fi
1094 @cp -f $(objtree)/modules.order $(MODLIB)/
1095 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1096 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1097
1098# This depmod is only for convenience to give the initial
1099# boot a modules.dep even before / is mounted read-write. However the
1100# boot script depmod is the master version.
1101PHONY += _modinst_post
1102_modinst_post: _modinst_
1103 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1104 $(call cmd,depmod)
1105
1106else # CONFIG_MODULES
1107
1108# Modules not configured
1109# ---------------------------------------------------------------------------
1110
1111modules modules_install: FORCE
1112 @echo
1113 @echo "The present kernel configuration has modules disabled."
1114 @echo "Type 'make config' and enable loadable module support."
1115 @echo "Then build a kernel with module support enabled."
1116 @echo
1117 @exit 1
1118
1119endif # CONFIG_MODULES
1120
1121###
1122# Cleaning is done on three levels.
1123# make clean Delete most generated files
1124# Leave enough to build external modules
1125# make mrproper Delete the current configuration, and all generated files
1126# make distclean Remove editor backup files, patch leftover files and the like
1127
1128# Directories & files removed with 'make clean'
1129CLEAN_DIRS += $(MODVERDIR)
1130CLEAN_FILES += vmlinux System.map \
1131 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1132
1133# Directories & files removed with 'make mrproper'
1134MRPROPER_DIRS += include/config usr/include include/generated
1135MRPROPER_FILES += .config .config.old .version .old_version \
1136 include/linux/version.h \
1137 Module.symvers tags TAGS cscope*
1138
1139# clean - Delete most, but leave enough to build external modules
1140#
1141clean: rm-dirs := $(CLEAN_DIRS)
1142clean: rm-files := $(CLEAN_FILES)
1143clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation)
1144
1145PHONY += $(clean-dirs) clean archclean
1146$(clean-dirs):
1147 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1148
1149clean: archclean
1150
1151# mrproper - Delete all generated files, including .config
1152#
1153mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1154mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1155mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1156
1157PHONY += $(mrproper-dirs) mrproper archmrproper
1158$(mrproper-dirs):
1159 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1160
1161mrproper: clean archmrproper $(mrproper-dirs)
1162 $(call cmd,rmdirs)
1163 $(call cmd,rmfiles)
1164
1165# distclean
1166#
1167PHONY += distclean
1168
1169distclean: mrproper
1170 @find $(srctree) $(RCS_FIND_IGNORE) \
1171 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1172 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1173 -o -name '.*.rej' -o -size 0 \
1174 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1175 -type f -print | xargs rm -f
1176
1177
1178# Packaging of the kernel to various formats
1179# ---------------------------------------------------------------------------
1180# rpm target kept for backward compatibility
1181package-dir := $(srctree)/scripts/package
1182
1183%src-pkg: FORCE
1184 $(Q)$(MAKE) $(build)=$(package-dir) $@
1185%pkg: include/config/kernel.release FORCE
1186 $(Q)$(MAKE) $(build)=$(package-dir) $@
1187rpm: include/config/kernel.release FORCE
1188 $(Q)$(MAKE) $(build)=$(package-dir) $@
1189
1190
1191# Brief documentation of the typical targets used
1192# ---------------------------------------------------------------------------
1193
1194boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1195boards := $(notdir $(boards))
1196board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1197board-dirs := $(sort $(notdir $(board-dirs:/=)))
1198
1199help:
1200 @echo 'Cleaning targets:'
1201 @echo ' clean - Remove most generated files but keep the config and'
1202 @echo ' enough build support to build external modules'
1203 @echo ' mrproper - Remove all generated files + config + various backup files'
1204 @echo ' distclean - mrproper + remove editor backup and patch files'
1205 @echo ''
1206 @echo 'Configuration targets:'
1207 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1208 @echo ''
1209 @echo 'Other generic targets:'
1210 @echo ' all - Build all targets marked with [*]'
1211 @echo '* vmlinux - Build the bare kernel'
1212 @echo '* modules - Build all modules'
1213 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1214 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1215 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1216 @echo ' dir/ - Build all files in dir and below'
1217 @echo ' dir/file.[oisS] - Build specified target only'
1218 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1219 @echo ' (requires a recent binutils and recent build (System.map))'
1220 @echo ' dir/file.ko - Build module including final link'
1221 @echo ' modules_prepare - Set up for building external modules'
1222 @echo ' tags/TAGS - Generate tags file for editors'
1223 @echo ' cscope - Generate cscope index'
1224 @echo ' kernelrelease - Output the release version string'
1225 @echo ' kernelversion - Output the version stored in Makefile'
1226 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1227 echo ' (default: $(INSTALL_HDR_PATH))'; \
1228 echo ''
1229 @echo 'Static analysers'
1230 @echo ' checkstack - Generate a list of stack hogs'
1231 @echo ' namespacecheck - Name space analysis on compiled kernel'
1232 @echo ' versioncheck - Sanity check on version.h usage'
1233 @echo ' includecheck - Check for duplicate included header files'
1234 @echo ' export_report - List the usages of all exported symbols'
1235 @echo ' headers_check - Sanity check on exported headers'
1236 @echo ' headerdep - Detect inclusion cycles in headers'
1237 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1238 @echo ''
1239 @echo 'Kernel packaging:'
1240 @$(MAKE) $(build)=$(package-dir) help
1241 @echo ''
1242 @echo 'Documentation targets:'
1243 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1244 @echo ''
1245 @echo 'Architecture specific targets ($(SRCARCH)):'
1246 @$(if $(archhelp),$(archhelp),\
1247 echo ' No architecture specific help defined for $(SRCARCH)')
1248 @echo ''
1249 @$(if $(boards), \
1250 $(foreach b, $(boards), \
1251 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1252 echo '')
1253 @$(if $(board-dirs), \
1254 $(foreach b, $(board-dirs), \
1255 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1256 printf " %-16s - Show all of the above\\n" help-boards; \
1257 echo '')
1258
1259 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1260 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1261 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1262 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1263 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1264 @echo ''
1265 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1266 @echo 'For further info see the ./README file'
1267
1268
1269help-board-dirs := $(addprefix help-,$(board-dirs))
1270
1271help-boards: $(help-board-dirs)
1272
1273boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1274
1275$(help-board-dirs): help-%:
1276 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1277 @$(if $(boards-per-dir), \
1278 $(foreach b, $(boards-per-dir), \
1279 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1280 echo '')
1281
1282
1283# Documentation targets
1284# ---------------------------------------------------------------------------
1285%docs: scripts_basic FORCE
1286 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1287
1288else # KBUILD_EXTMOD
1289
1290###
1291# External module support.
1292# When building external modules the kernel used as basis is considered
1293# read-only, and no consistency checks are made and the make
1294# system is not used on the basis kernel. If updates are required
1295# in the basis kernel ordinary make commands (without M=...) must
1296# be used.
1297#
1298# The following are the only valid targets when building external
1299# modules.
1300# make M=dir clean Delete all automatically generated files
1301# make M=dir modules Make all modules in specified dir
1302# make M=dir Same as 'make M=dir modules'
1303# make M=dir modules_install
1304# Install the modules built in the module directory
1305# Assumes install directory is already created
1306
1307# We are always building modules
1308KBUILD_MODULES := 1
1309PHONY += crmodverdir
1310crmodverdir:
1311 $(cmd_crmodverdir)
1312
1313PHONY += $(objtree)/Module.symvers
1314$(objtree)/Module.symvers:
1315 @test -e $(objtree)/Module.symvers || ( \
1316 echo; \
1317 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1318 echo " is missing; modules will have no dependencies and modversions."; \
1319 echo )
1320
1321module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1322PHONY += $(module-dirs) modules
1323$(module-dirs): crmodverdir $(objtree)/Module.symvers
1324 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1325
1326modules: $(module-dirs)
1327 @$(kecho) ' Building modules, stage 2.';
1328 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1329
1330PHONY += modules_install
1331modules_install: _emodinst_ _emodinst_post
1332
1333install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1334PHONY += _emodinst_
1335_emodinst_:
1336 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1337 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1338
1339PHONY += _emodinst_post
1340_emodinst_post: _emodinst_
1341 $(call cmd,depmod)
1342
1343clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1344
1345PHONY += $(clean-dirs) clean
1346$(clean-dirs):
1347 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1348
1349clean: rm-dirs := $(MODVERDIR)
1350clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1351
1352help:
1353 @echo ' Building external modules.'
1354 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1355 @echo ''
1356 @echo ' modules - default target, build the module(s)'
1357 @echo ' modules_install - install the module'
1358 @echo ' clean - remove generated files in module directory only'
1359 @echo ''
1360
1361# Dummies...
1362PHONY += prepare scripts
1363prepare: ;
1364scripts: ;
1365endif # KBUILD_EXTMOD
1366
1367clean: $(clean-dirs)
1368 $(call cmd,rmdirs)
1369 $(call cmd,rmfiles)
1370 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1371 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1372 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1373 -o -name '*.symtypes' -o -name 'modules.order' \
1374 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1375 -o -name '*.gcno' \) -type f -print | xargs rm -f
1376
1377# Generate tags for editors
1378# ---------------------------------------------------------------------------
1379quiet_cmd_tags = GEN $@
1380 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1381
1382tags TAGS cscope: FORCE
1383 $(call cmd,tags)
1384
1385# Scripts to check various things for consistency
1386# ---------------------------------------------------------------------------
1387
1388includecheck:
1389 find * $(RCS_FIND_IGNORE) \
1390 -name '*.[hcS]' -type f -print | sort \
1391 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1392
1393versioncheck:
1394 find * $(RCS_FIND_IGNORE) \
1395 -name '*.[hcS]' -type f -print | sort \
1396 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1397
1398coccicheck:
1399 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1400
1401namespacecheck:
1402 $(PERL) $(srctree)/scripts/namespace.pl
1403
1404export_report:
1405 $(PERL) $(srctree)/scripts/export_report.pl
1406
1407endif #ifeq ($(config-targets),1)
1408endif #ifeq ($(mixed-targets),1)
1409
1410PHONY += checkstack kernelrelease kernelversion
1411
1412# UML needs a little special treatment here. It wants to use the host
1413# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1414# else wants $(ARCH), including people doing cross-builds, which means
1415# that $(SUBARCH) doesn't work here.
1416ifeq ($(ARCH), um)
1417CHECKSTACK_ARCH := $(SUBARCH)
1418else
1419CHECKSTACK_ARCH := $(ARCH)
1420endif
1421checkstack:
1422 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1423 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1424
1425kernelrelease:
1426 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1427
1428kernelversion:
1429 @echo $(KERNELVERSION)
1430
1431# Single targets
1432# ---------------------------------------------------------------------------
1433# Single targets are compatible with:
1434# - build with mixed source and output
1435# - build with separate output dir 'make O=...'
1436# - external modules
1437#
1438# target-dir => where to store outputfile
1439# build-dir => directory in kernel source tree to use
1440
1441ifeq ($(KBUILD_EXTMOD),)
1442 build-dir = $(patsubst %/,%,$(dir $@))
1443 target-dir = $(dir $@)
1444else
1445 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1446 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1447 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1448endif
1449
1450%.s: %.c prepare scripts FORCE
1451 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1452%.i: %.c prepare scripts FORCE
1453 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1454%.o: %.c prepare scripts FORCE
1455 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1456%.lst: %.c prepare scripts FORCE
1457 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1458%.s: %.S prepare scripts FORCE
1459 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1460%.o: %.S prepare scripts FORCE
1461 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1462%.symtypes: %.c prepare scripts FORCE
1463 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1464
1465# Modules
1466/: prepare scripts FORCE
1467 $(cmd_crmodverdir)
1468 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1469 $(build)=$(build-dir)
1470%/: prepare scripts FORCE
1471 $(cmd_crmodverdir)
1472 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1473 $(build)=$(build-dir)
1474%.ko: prepare scripts FORCE
1475 $(cmd_crmodverdir)
1476 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1477 $(build)=$(build-dir) $(@:.ko=.o)
1478 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1479
1480# FIXME Should go into a make.lib or something
1481# ===========================================================================
1482
1483quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1484 cmd_rmdirs = rm -rf $(rm-dirs)
1485
1486quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1487 cmd_rmfiles = rm -f $(rm-files)
1488
1489# Run depmod only if we have System.map and depmod is executable
1490quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1491 cmd_depmod = \
1492 if [ -r System.map -a -x $(DEPMOD) ]; then \
1493 $(DEPMOD) -ae -F System.map \
1494 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) ) \
1495 $(KERNELRELEASE); \
1496 fi
1497
1498# Create temporary dir for module support files
1499# clean it up only when building all modules
1500cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1501 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1502
1503a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1504 $(KBUILD_AFLAGS_KERNEL) \
1505 $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1506 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1507
1508quiet_cmd_as_o_S = AS $@
1509cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1510
1511# read all saved command lines
1512
1513targets := $(wildcard $(sort $(targets)))
1514cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1515
1516ifneq ($(cmd_files),)
1517 $(cmd_files): ; # Do not try to update included dependency files
1518 include $(cmd_files)
1519endif
1520
1521# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1522# Usage:
1523# $(Q)$(MAKE) $(clean)=dir
1524clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1525
1526endif # skip-makefile
1527
1528PHONY += FORCE
1529FORCE:
1530
1531# Declare the contents of the .PHONY variable as phony. We keep that
1532# information in a variable so we can use it in if_changed and friends.
1533.PHONY: $(PHONY)