xref: /linux/Makefile (revision 137e95906e294913fab02162e8a1948ade49acb5)
1FRED=42
2VERSION = 2
3PATCHLEVEL = 6
4SUBLEVEL = 26
5EXTRAVERSION = -rc8
6NAME = Rotary Wombat
7
8# *DOCUMENTATION*
9# To see a list of typical targets execute "make help"
10# More info can be located in ./README
11# Comments in this file are targeted only to the developer, do not
12# expect to learn how to build the kernel reading this file.
13
14# Do not:
15# o  use make's built-in rules and variables
16#    (this increases performance and avoids hard-to-debug behaviour);
17# o  print "Entering directory ...";
18MAKEFLAGS += -rR --no-print-directory
19
20# We are using a recursive build, so we need to do a little thinking
21# to get the ordering right.
22#
23# Most importantly: sub-Makefiles should only ever modify files in
24# their own directory. If in some directory we have a dependency on
25# a file in another dir (which doesn't happen often, but it's often
26# unavoidable when linking the built-in.o targets which finally
27# turn into vmlinux), we will call a sub make in that other dir, and
28# after that we are sure that everything which is in that other dir
29# is now up to date.
30#
31# The only cases where we need to modify files which have global
32# effects are thus separated out and done before the recursive
33# descending is started. They are now explicitly listed as the
34# prepare rule.
35
36# To put more focus on warnings, be less verbose as default
37# Use 'make V=1' to see the full commands
38
39ifdef V
40  ifeq ("$(origin V)", "command line")
41    KBUILD_VERBOSE = $(V)
42  endif
43endif
44ifndef KBUILD_VERBOSE
45  KBUILD_VERBOSE = 0
46endif
47
48# Call a source code checker (by default, "sparse") as part of the
49# C compilation.
50#
51# Use 'make C=1' to enable checking of only re-compiled files.
52# Use 'make C=2' to enable checking of *all* source files, regardless
53# of whether they are re-compiled or not.
54#
55# See the file "Documentation/sparse.txt" for more details, including
56# where to get the "sparse" utility.
57
58ifdef C
59  ifeq ("$(origin C)", "command line")
60    KBUILD_CHECKSRC = $(C)
61  endif
62endif
63ifndef KBUILD_CHECKSRC
64  KBUILD_CHECKSRC = 0
65endif
66
67# Use make M=dir to specify directory of external module to build
68# Old syntax make ... SUBDIRS=$PWD is still supported
69# Setting the environment variable KBUILD_EXTMOD take precedence
70ifdef SUBDIRS
71  KBUILD_EXTMOD ?= $(SUBDIRS)
72endif
73ifdef M
74  ifeq ("$(origin M)", "command line")
75    KBUILD_EXTMOD := $(M)
76  endif
77endif
78
79
80# kbuild supports saving output files in a separate directory.
81# To locate output files in a separate directory two syntaxes are supported.
82# In both cases the working directory must be the root of the kernel src.
83# 1) O=
84# Use "make O=dir/to/store/output/files/"
85#
86# 2) Set KBUILD_OUTPUT
87# Set the environment variable KBUILD_OUTPUT to point to the directory
88# where the output files shall be placed.
89# export KBUILD_OUTPUT=dir/to/store/output/files/
90# make
91#
92# The O= assignment takes precedence over the KBUILD_OUTPUT environment
93# variable.
94
95
96# KBUILD_SRC is set on invocation of make in OBJ directory
97# KBUILD_SRC is not intended to be used by the regular user (for now)
98ifeq ($(KBUILD_SRC),)
99
100# OK, Make called in directory where kernel src resides
101# Do we want to locate output files in a separate directory?
102ifdef O
103  ifeq ("$(origin O)", "command line")
104    KBUILD_OUTPUT := $(O)
105  endif
106endif
107
108# That's our default target when none is given on the command line
109PHONY := _all
110_all:
111
112# Cancel implicit rules on top Makefile
113$(CURDIR)/Makefile Makefile: ;
114
115ifneq ($(KBUILD_OUTPUT),)
116# Invoke a second make in the output directory, passing relevant variables
117# check that the output directory actually exists
118saved-output := $(KBUILD_OUTPUT)
119KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
120$(if $(KBUILD_OUTPUT),, \
121     $(error output directory "$(saved-output)" does not exist))
122
123PHONY += $(MAKECMDGOALS) sub-make
124
125$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
126	$(Q)@:
127
128sub-make: FORCE
129	$(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
130	KBUILD_SRC=$(CURDIR) \
131	KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
132	$(filter-out _all sub-make,$(MAKECMDGOALS))
133
134# Leave processing to above invocation of make
135skip-makefile := 1
136endif # ifneq ($(KBUILD_OUTPUT),)
137endif # ifeq ($(KBUILD_SRC),)
138
139# We process the rest of the Makefile if this is the final invocation of make
140ifeq ($(skip-makefile),)
141
142# If building an external module we do not care about the all: rule
143# but instead _all depend on modules
144PHONY += all
145ifeq ($(KBUILD_EXTMOD),)
146_all: all
147else
148_all: modules
149endif
150
151srctree		:= $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
152TOPDIR		:= $(srctree)
153# FIXME - TOPDIR is obsolete, use srctree/objtree
154objtree		:= $(CURDIR)
155src		:= $(srctree)
156obj		:= $(objtree)
157
158VPATH		:= $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
159
160export srctree objtree VPATH TOPDIR
161
162
163# SUBARCH tells the usermode build what the underlying arch is.  That is set
164# first, and if a usermode build is happening, the "ARCH=um" on the command
165# line overrides the setting of ARCH below.  If a native build is happening,
166# then ARCH is assigned, getting whatever value it gets normally, and
167# SUBARCH is subsequently ignored.
168
169SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
170				  -e s/arm.*/arm/ -e s/sa110/arm/ \
171				  -e s/s390x/s390/ -e s/parisc64/parisc/ \
172				  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
173				  -e s/sh.*/sh/ )
174
175# Cross compiling and selecting different set of gcc/bin-utils
176# ---------------------------------------------------------------------------
177#
178# When performing cross compilation for other architectures ARCH shall be set
179# to the target architecture. (See arch/* for the possibilities).
180# ARCH can be set during invocation of make:
181# make ARCH=ia64
182# Another way is to have ARCH set in the environment.
183# The default ARCH is the host where make is executed.
184
185# CROSS_COMPILE specify the prefix used for all executables used
186# during compilation. Only gcc and related bin-utils executables
187# are prefixed with $(CROSS_COMPILE).
188# CROSS_COMPILE can be set on the command line
189# make CROSS_COMPILE=ia64-linux-
190# Alternatively CROSS_COMPILE can be set in the environment.
191# Default value for CROSS_COMPILE is not to prefix executables
192# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
193export KBUILD_BUILDHOST := $(SUBARCH)
194ARCH		?= $(SUBARCH)
195CROSS_COMPILE	?=
196
197# Architecture as present in compile.h
198UTS_MACHINE 	:= $(ARCH)
199SRCARCH 	:= $(ARCH)
200
201# Additional ARCH settings for x86
202ifeq ($(ARCH),i386)
203        SRCARCH := x86
204endif
205ifeq ($(ARCH),x86_64)
206        SRCARCH := x86
207endif
208
209KCONFIG_CONFIG	?= .config
210
211# SHELL used by kbuild
212CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
213	  else if [ -x /bin/bash ]; then echo /bin/bash; \
214	  else echo sh; fi ; fi)
215
216HOSTCC       = gcc
217HOSTCXX      = g++
218HOSTCFLAGS   = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
219HOSTCXXFLAGS = -O2
220
221# Decide whether to build built-in, modular, or both.
222# Normally, just do built-in.
223
224KBUILD_MODULES :=
225KBUILD_BUILTIN := 1
226
227#	If we have only "make modules", don't compile built-in objects.
228#	When we're building modules with modversions, we need to consider
229#	the built-in objects during the descend as well, in order to
230#	make sure the checksums are up to date before we record them.
231
232ifeq ($(MAKECMDGOALS),modules)
233  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
234endif
235
236#	If we have "make <whatever> modules", compile modules
237#	in addition to whatever we do anyway.
238#	Just "make" or "make all" shall build modules as well
239
240ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
241  KBUILD_MODULES := 1
242endif
243
244ifeq ($(MAKECMDGOALS),)
245  KBUILD_MODULES := 1
246endif
247
248export KBUILD_MODULES KBUILD_BUILTIN
249export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
250
251# Beautify output
252# ---------------------------------------------------------------------------
253#
254# Normally, we echo the whole command before executing it. By making
255# that echo $($(quiet)$(cmd)), we now have the possibility to set
256# $(quiet) to choose other forms of output instead, e.g.
257#
258#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
259#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
260#
261# If $(quiet) is empty, the whole command will be printed.
262# If it is set to "quiet_", only the short version will be printed.
263# If it is set to "silent_", nothing will be printed at all, since
264# the variable $(silent_cmd_cc_o_c) doesn't exist.
265#
266# A simple variant is to prefix commands with $(Q) - that's useful
267# for commands that shall be hidden in non-verbose mode.
268#
269#	$(Q)ln $@ :<
270#
271# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
272# If KBUILD_VERBOSE equals 1 then the above command is displayed.
273
274ifeq ($(KBUILD_VERBOSE),1)
275  quiet =
276  Q =
277else
278  quiet=quiet_
279  Q = @
280endif
281
282# If the user is running make -s (silent mode), suppress echoing of
283# commands
284
285ifneq ($(findstring s,$(MAKEFLAGS)),)
286  quiet=silent_
287endif
288
289export quiet Q KBUILD_VERBOSE
290
291
292# Look for make include files relative to root of kernel src
293MAKEFLAGS += --include-dir=$(srctree)
294
295# We need some generic definitions (do not try to remake the file).
296$(srctree)/scripts/Kbuild.include: ;
297include $(srctree)/scripts/Kbuild.include
298
299# Make variables (CC, etc...)
300
301AS		= $(CROSS_COMPILE)as
302LD		= $(CROSS_COMPILE)ld
303CC		= $(CROSS_COMPILE)gcc
304CPP		= $(CC) -E
305AR		= $(CROSS_COMPILE)ar
306NM		= $(CROSS_COMPILE)nm
307STRIP		= $(CROSS_COMPILE)strip
308OBJCOPY		= $(CROSS_COMPILE)objcopy
309OBJDUMP		= $(CROSS_COMPILE)objdump
310AWK		= awk
311GENKSYMS	= scripts/genksyms/genksyms
312DEPMOD		= /sbin/depmod
313KALLSYMS	= scripts/kallsyms
314PERL		= perl
315CHECK		= sparse
316
317CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
318MODFLAGS	= -DMODULE
319CFLAGS_MODULE   = $(MODFLAGS)
320AFLAGS_MODULE   = $(MODFLAGS)
321LDFLAGS_MODULE  =
322CFLAGS_KERNEL	=
323AFLAGS_KERNEL	=
324
325
326# Use LINUXINCLUDE when you must reference the include/ directory.
327# Needed to be compatible with the O= option
328LINUXINCLUDE    := -Iinclude \
329                   $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
330		   -include include/linux/autoconf.h
331
332KBUILD_CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE)
333
334KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
335		   -fno-strict-aliasing -fno-common \
336		   -Werror-implicit-function-declaration
337KBUILD_AFLAGS   := -D__ASSEMBLY__
338
339# Read KERNELRELEASE from include/config/kernel.release (if it exists)
340KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
341KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
342
343export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
344export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
345export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
346export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
347
348export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
349export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
350export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
351
352# When compiling out-of-tree modules, put MODVERDIR in the module
353# tree rather than in the kernel tree. The kernel tree might
354# even be read-only.
355export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
356
357# Files to ignore in find ... statements
358
359RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
360export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
361
362# ===========================================================================
363# Rules shared between *config targets and build targets
364
365# Basic helpers built in scripts/
366PHONY += scripts_basic
367scripts_basic:
368	$(Q)$(MAKE) $(build)=scripts/basic
369
370# To avoid any implicit rule to kick in, define an empty command.
371scripts/basic/%: scripts_basic ;
372
373PHONY += outputmakefile
374# outputmakefile generates a Makefile in the output directory, if using a
375# separate output directory. This allows convenient use of make in the
376# output directory.
377outputmakefile:
378ifneq ($(KBUILD_SRC),)
379	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
380	    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
381endif
382
383# To make sure we do not include .config for any of the *config targets
384# catch them early, and hand them over to scripts/kconfig/Makefile
385# It is allowed to specify more targets when calling make, including
386# mixing *config targets and build targets.
387# For example 'make oldconfig all'.
388# Detect when mixed targets is specified, and make a second invocation
389# of make so .config is not included in this case either (for *config).
390
391no-dot-config-targets := clean mrproper distclean \
392			 cscope TAGS tags help %docs check% \
393			 include/linux/version.h headers_% \
394			 kernelrelease kernelversion
395
396config-targets := 0
397mixed-targets  := 0
398dot-config     := 1
399
400ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
401	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
402		dot-config := 0
403	endif
404endif
405
406ifeq ($(KBUILD_EXTMOD),)
407        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
408                config-targets := 1
409                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
410                        mixed-targets := 1
411                endif
412        endif
413endif
414
415ifeq ($(mixed-targets),1)
416# ===========================================================================
417# We're called with mixed targets (*config and build targets).
418# Handle them one by one.
419
420%:: FORCE
421	$(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
422
423else
424ifeq ($(config-targets),1)
425# ===========================================================================
426# *config targets only - make sure prerequisites are updated, and descend
427# in scripts/kconfig to make the *config target
428
429# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
430# KBUILD_DEFCONFIG may point out an alternative default configuration
431# used for 'make defconfig'
432include $(srctree)/arch/$(SRCARCH)/Makefile
433export KBUILD_DEFCONFIG
434
435config %config: scripts_basic outputmakefile FORCE
436	$(Q)mkdir -p include/linux include/config
437	$(Q)$(MAKE) $(build)=scripts/kconfig $@
438
439else
440# ===========================================================================
441# Build targets only - this includes vmlinux, arch specific targets, clean
442# targets and others. In general all targets except *config targets.
443
444ifeq ($(KBUILD_EXTMOD),)
445# Additional helpers built in scripts/
446# Carefully list dependencies so we do not try to build scripts twice
447# in parallel
448PHONY += scripts
449scripts: scripts_basic include/config/auto.conf
450	$(Q)$(MAKE) $(build)=$(@)
451
452# Objects we will link into vmlinux / subdirs we need to visit
453init-y		:= init/
454drivers-y	:= drivers/ sound/
455net-y		:= net/
456libs-y		:= lib/
457core-y		:= usr/
458endif # KBUILD_EXTMOD
459
460ifeq ($(dot-config),1)
461# Read in config
462-include include/config/auto.conf
463
464ifeq ($(KBUILD_EXTMOD),)
465# Read in dependencies to all Kconfig* files, make sure to run
466# oldconfig if changes are detected.
467-include include/config/auto.conf.cmd
468
469# To avoid any implicit rule to kick in, define an empty command
470$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
471
472# If .config is newer than include/config/auto.conf, someone tinkered
473# with it and forgot to run make oldconfig.
474# if auto.conf.cmd is missing then we are probably in a cleaned tree so
475# we execute the config step to be sure to catch updated Kconfig files
476include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
477	$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
478else
479# external modules needs include/linux/autoconf.h and include/config/auto.conf
480# but do not care if they are up-to-date. Use auto.conf to trigger the test
481PHONY += include/config/auto.conf
482
483include/config/auto.conf:
484	$(Q)test -e include/linux/autoconf.h -a -e $@ || (		\
485	echo;								\
486	echo "  ERROR: Kernel configuration is invalid.";		\
487	echo "         include/linux/autoconf.h or $@ are missing.";	\
488	echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";	\
489	echo;								\
490	/bin/false)
491
492endif # KBUILD_EXTMOD
493
494else
495# Dummy target needed, because used as prerequisite
496include/config/auto.conf: ;
497endif # $(dot-config)
498
499# The all: target is the default when no target is given on the
500# command line.
501# This allow a user to issue only 'make' to build a kernel including modules
502# Defaults vmlinux but it is usually overridden in the arch makefile
503all: vmlinux
504
505ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
506KBUILD_CFLAGS	+= -Os
507else
508KBUILD_CFLAGS	+= -O2
509endif
510
511ifneq (CONFIG_FRAME_WARN,0)
512KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
513endif
514
515# Force gcc to behave correct even for buggy distributions
516# Arch Makefiles may override this setting
517KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
518
519include $(srctree)/arch/$(SRCARCH)/Makefile
520
521ifdef CONFIG_FRAME_POINTER
522KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
523else
524KBUILD_CFLAGS	+= -fomit-frame-pointer
525endif
526
527ifdef CONFIG_DEBUG_INFO
528KBUILD_CFLAGS	+= -g
529KBUILD_AFLAGS	+= -gdwarf-2
530endif
531
532# We trigger additional mismatches with less inlining
533ifdef CONFIG_DEBUG_SECTION_MISMATCH
534KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
535endif
536
537# arch Makefile may override CC so keep this after arch Makefile is included
538NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
539CHECKFLAGS     += $(NOSTDINC_FLAGS)
540
541# warn about C99 declaration after statement
542KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
543
544# disable pointer signed / unsigned warnings in gcc 4.0
545KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
546
547# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
548# But warn user when we do so
549warn-assign = \
550$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
551
552ifneq ($(KCPPFLAGS),)
553        $(call warn-assign,CPPFLAGS)
554        KBUILD_CPPFLAGS += $(KCPPFLAGS)
555endif
556ifneq ($(KAFLAGS),)
557        $(call warn-assign,AFLAGS)
558        KBUILD_AFLAGS += $(KAFLAGS)
559endif
560ifneq ($(KCFLAGS),)
561        $(call warn-assign,CFLAGS)
562        KBUILD_CFLAGS += $(KCFLAGS)
563endif
564
565# Use --build-id when available.
566LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
567			      $(call ld-option, -Wl$(comma)--build-id,))
568LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
569LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
570
571# Default kernel image to build when no specific target is given.
572# KBUILD_IMAGE may be overruled on the command line or
573# set in the environment
574# Also any assignments in arch/$(ARCH)/Makefile take precedence over
575# this default value
576export KBUILD_IMAGE ?= vmlinux
577
578#
579# INSTALL_PATH specifies where to place the updated kernel and system map
580# images. Default is /boot, but you can set it to other values
581export	INSTALL_PATH ?= /boot
582
583#
584# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
585# relocations required by build roots.  This is not defined in the
586# makefile but the argument can be passed to make if needed.
587#
588
589MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
590export MODLIB
591
592#
593#  INSTALL_MOD_STRIP, if defined, will cause modules to be
594#  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
595#  the default option --strip-debug will be used.  Otherwise,
596#  INSTALL_MOD_STRIP will used as the options to the strip command.
597
598ifdef INSTALL_MOD_STRIP
599ifeq ($(INSTALL_MOD_STRIP),1)
600mod_strip_cmd = $(STRIP) --strip-debug
601else
602mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
603endif # INSTALL_MOD_STRIP=1
604else
605mod_strip_cmd = true
606endif # INSTALL_MOD_STRIP
607export mod_strip_cmd
608
609
610ifeq ($(KBUILD_EXTMOD),)
611core-y		+= kernel/ mm/ fs/ ipc/ security/ crypto/ block/
612
613vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
614		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
615		     $(net-y) $(net-m) $(libs-y) $(libs-m)))
616
617vmlinux-alldirs	:= $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
618		     $(init-n) $(init-) \
619		     $(core-n) $(core-) $(drivers-n) $(drivers-) \
620		     $(net-n)  $(net-)  $(libs-n)    $(libs-))))
621
622init-y		:= $(patsubst %/, %/built-in.o, $(init-y))
623core-y		:= $(patsubst %/, %/built-in.o, $(core-y))
624drivers-y	:= $(patsubst %/, %/built-in.o, $(drivers-y))
625net-y		:= $(patsubst %/, %/built-in.o, $(net-y))
626libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
627libs-y2		:= $(patsubst %/, %/built-in.o, $(libs-y))
628libs-y		:= $(libs-y1) $(libs-y2)
629
630# Build vmlinux
631# ---------------------------------------------------------------------------
632# vmlinux is built from the objects selected by $(vmlinux-init) and
633# $(vmlinux-main). Most are built-in.o files from top-level directories
634# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
635# Ordering when linking is important, and $(vmlinux-init) must be first.
636#
637# vmlinux
638#   ^
639#   |
640#   +-< $(vmlinux-init)
641#   |   +--< init/version.o + more
642#   |
643#   +--< $(vmlinux-main)
644#   |    +--< driver/built-in.o mm/built-in.o + more
645#   |
646#   +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
647#
648# vmlinux version (uname -v) cannot be updated during normal
649# descending-into-subdirs phase since we do not yet know if we need to
650# update vmlinux.
651# Therefore this step is delayed until just before final link of vmlinux -
652# except in the kallsyms case where it is done just before adding the
653# symbols to the kernel.
654#
655# System.map is generated to document addresses of all kernel symbols
656
657vmlinux-init := $(head-y) $(init-y)
658vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
659vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
660vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
661export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
662
663# Rule to link vmlinux - also used during CONFIG_KALLSYMS
664# May be overridden by arch/$(ARCH)/Makefile
665quiet_cmd_vmlinux__ ?= LD      $@
666      cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
667      -T $(vmlinux-lds) $(vmlinux-init)                          \
668      --start-group $(vmlinux-main) --end-group                  \
669      $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
670
671# Generate new vmlinux version
672quiet_cmd_vmlinux_version = GEN     .version
673      cmd_vmlinux_version = set -e;                     \
674	if [ ! -r .version ]; then			\
675	  rm -f .version;				\
676	  echo 1 >.version;				\
677	else						\
678	  mv .version .old_version;			\
679	  expr 0$$(cat .old_version) + 1 >.version;	\
680	fi;						\
681	$(MAKE) $(build)=init
682
683# Generate System.map
684quiet_cmd_sysmap = SYSMAP
685      cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
686
687# Link of vmlinux
688# If CONFIG_KALLSYMS is set .version is already updated
689# Generate System.map and verify that the content is consistent
690# Use + in front of the vmlinux_version rule to silent warning with make -j2
691# First command is ':' to allow us to use + in front of the rule
692define rule_vmlinux__
693	:
694	$(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
695
696	$(call cmd,vmlinux__)
697	$(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
698
699	$(Q)$(if $($(quiet)cmd_sysmap),                                      \
700	  echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
701	$(cmd_sysmap) $@ System.map;                                         \
702	if [ $$? -ne 0 ]; then                                               \
703		rm -f $@;                                                    \
704		/bin/false;                                                  \
705	fi;
706	$(verify_kallsyms)
707endef
708
709
710ifdef CONFIG_KALLSYMS
711# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
712# It's a three stage process:
713# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
714#   empty
715#   Running kallsyms on that gives us .tmp_kallsyms1.o with
716#   the right size - vmlinux version (uname -v) is updated during this step
717# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
718#   but due to the added section, some addresses have shifted.
719#   From here, we generate a correct .tmp_kallsyms2.o
720# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
721# o Verify that the System.map from vmlinux matches the map from
722#   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
723# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
724#   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
725#   temporary bypass to allow the kernel to be built while the
726#   maintainers work out what went wrong with kallsyms.
727
728ifdef CONFIG_KALLSYMS_EXTRA_PASS
729last_kallsyms := 3
730else
731last_kallsyms := 2
732endif
733
734kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
735
736define verify_kallsyms
737	$(Q)$(if $($(quiet)cmd_sysmap),                                      \
738	  echo '  $($(quiet)cmd_sysmap)  .tmp_System.map' &&)                \
739	  $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
740	$(Q)cmp -s System.map .tmp_System.map ||                             \
741		(echo Inconsistent kallsyms data;                            \
742		 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
743		 rm .tmp_kallsyms* ; /bin/false )
744endef
745
746# Update vmlinux version before link
747# Use + in front of this rule to silent warning about make -j1
748# First command is ':' to allow us to use + in front of this rule
749cmd_ksym_ld = $(cmd_vmlinux__)
750define rule_ksym_ld
751	:
752	+$(call cmd,vmlinux_version)
753	$(call cmd,vmlinux__)
754	$(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
755endef
756
757# Generate .S file with all kernel symbols
758quiet_cmd_kallsyms = KSYM    $@
759      cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
760                     $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
761
762.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
763	$(call if_changed_dep,as_o_S)
764
765.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
766	$(call cmd,kallsyms)
767
768# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
769.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
770	$(call if_changed_rule,ksym_ld)
771
772.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
773	$(call if_changed,vmlinux__)
774
775.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
776	$(call if_changed,vmlinux__)
777
778# Needs to visit scripts/ before $(KALLSYMS) can be used.
779$(KALLSYMS): scripts ;
780
781# Generate some data for debugging strange kallsyms problems
782debug_kallsyms: .tmp_map$(last_kallsyms)
783
784.tmp_map%: .tmp_vmlinux% FORCE
785	($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
786
787.tmp_map3: .tmp_map2
788
789.tmp_map2: .tmp_map1
790
791endif # ifdef CONFIG_KALLSYMS
792
793# Do modpost on a prelinked vmlinux. The finally linked vmlinux has
794# relevant sections renamed as per the linker script.
795quiet_cmd_vmlinux-modpost = LD      $@
796      cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@                          \
797	 $(vmlinux-init) --start-group $(vmlinux-main) --end-group             \
798	 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
799define rule_vmlinux-modpost
800	:
801	+$(call cmd,vmlinux-modpost)
802	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
803	$(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
804endef
805
806# vmlinux image - including updated kernel symbols
807vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
808ifdef CONFIG_HEADERS_CHECK
809	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
810endif
811ifdef CONFIG_SAMPLES
812	$(Q)$(MAKE) $(build)=samples
813endif
814	$(call vmlinux-modpost)
815	$(call if_changed_rule,vmlinux__)
816	$(Q)rm -f .old_version
817
818# build vmlinux.o first to catch section mismatch errors early
819ifdef CONFIG_KALLSYMS
820.tmp_vmlinux1: vmlinux.o
821endif
822
823modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
824vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
825	$(call if_changed_rule,vmlinux-modpost)
826
827# The actual objects are generated when descending,
828# make sure no implicit rule kicks in
829$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
830
831# Handle descending into subdirectories listed in $(vmlinux-dirs)
832# Preset locale variables to speed up the build process. Limit locale
833# tweaks to this spot to avoid wrong language settings when running
834# make menuconfig etc.
835# Error messages still appears in the original language
836
837PHONY += $(vmlinux-dirs)
838$(vmlinux-dirs): prepare scripts
839	$(Q)$(MAKE) $(build)=$@
840
841# Build the kernel release string
842#
843# The KERNELRELEASE value built here is stored in the file
844# include/config/kernel.release, and is used when executing several
845# make targets, such as "make install" or "make modules_install."
846#
847# The eventual kernel release string consists of the following fields,
848# shown in a hierarchical format to show how smaller parts are concatenated
849# to form the larger and final value, with values coming from places like
850# the Makefile, kernel config options, make command line options and/or
851# SCM tag information.
852#
853#	$(KERNELVERSION)
854#	  $(VERSION)			eg, 2
855#	  $(PATCHLEVEL)			eg, 6
856#	  $(SUBLEVEL)			eg, 18
857#	  $(EXTRAVERSION)		eg, -rc6
858#	$(localver-full)
859#	  $(localver)
860#	    localversion*		(files without backups, containing '~')
861#	    $(CONFIG_LOCALVERSION)	(from kernel config setting)
862#	  $(localver-auto)		(only if CONFIG_LOCALVERSION_AUTO is set)
863#	    ./scripts/setlocalversion	(SCM tag, if one exists)
864#	    $(LOCALVERSION)		(from make command line if provided)
865#
866#  Note how the final $(localver-auto) string is included *only* if the
867# kernel config option CONFIG_LOCALVERSION_AUTO is selected.  Also, at the
868# moment, only git is supported but other SCMs can edit the script
869# scripts/setlocalversion and add the appropriate checks as needed.
870
871pattern = ".*/localversion[^~]*"
872string  = $(shell cat /dev/null \
873	   `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
874
875localver = $(subst $(space),, $(string) \
876			      $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
877
878# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
879# and if the SCM is know a tag from the SCM is appended.
880# The appended tag is determined by the SCM used.
881#
882# Currently, only git is supported.
883# Other SCMs can edit scripts/setlocalversion and add the appropriate
884# checks as needed.
885ifdef CONFIG_LOCALVERSION_AUTO
886	_localver-auto = $(shell $(CONFIG_SHELL) \
887	                  $(srctree)/scripts/setlocalversion $(srctree))
888	localver-auto  = $(LOCALVERSION)$(_localver-auto)
889endif
890
891localver-full = $(localver)$(localver-auto)
892
893# Store (new) KERNELRELASE string in include/config/kernel.release
894kernelrelease = $(KERNELVERSION)$(localver-full)
895include/config/kernel.release: include/config/auto.conf FORCE
896	$(Q)rm -f $@
897	$(Q)echo $(kernelrelease) > $@
898
899
900# Things we need to do before we recursively start building the kernel
901# or the modules are listed in "prepare".
902# A multi level approach is used. prepareN is processed before prepareN-1.
903# archprepare is used in arch Makefiles and when processed asm symlink,
904# version.h and scripts_basic is processed / created.
905
906# Listed in dependency order
907PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
908
909# prepare3 is used to check if we are building in a separate output directory,
910# and if so do:
911# 1) Check that make has not been executed in the kernel src $(srctree)
912# 2) Create the include2 directory, used for the second asm symlink
913prepare3: include/config/kernel.release
914ifneq ($(KBUILD_SRC),)
915	@echo '  Using $(srctree) as source for kernel'
916	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
917		echo "  $(srctree) is not clean, please run 'make mrproper'";\
918		echo "  in the '$(srctree)' directory.";\
919		/bin/false; \
920	fi;
921	$(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
922	$(Q)ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm
923endif
924
925# prepare2 creates a makefile if using a separate output directory
926prepare2: prepare3 outputmakefile
927
928prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
929                   include/asm include/config/auto.conf
930	$(cmd_crmodverdir)
931
932archprepare: prepare1 scripts_basic
933
934prepare0: archprepare FORCE
935	$(Q)$(MAKE) $(build)=.
936	$(Q)$(MAKE) $(build)=. missing-syscalls
937
938# All the preparing..
939prepare: prepare0
940
941# Leave this as default for preprocessing vmlinux.lds.S, which is now
942# done in arch/$(ARCH)/kernel/Makefile
943
944export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
945
946# The asm symlink changes when $(ARCH) changes.
947# Detect this and ask user to run make mrproper
948
949include/asm: FORCE
950	$(Q)set -e; asmlink=`readlink include/asm | cut -d '-' -f 2`;   \
951	if [ -L include/asm ]; then                                     \
952		if [ "$$asmlink" != "$(SRCARCH)" ]; then                \
953			echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
954			echo "       set ARCH or save .config and run 'make mrproper' to fix it";             \
955			exit 1;                                         \
956		fi;                                                     \
957	else                                                            \
958		echo '  SYMLINK $@ -> include/asm-$(SRCARCH)';          \
959		if [ ! -d include ]; then                               \
960			mkdir -p include;                               \
961		fi;                                                     \
962		ln -fsn asm-$(SRCARCH) $@;                              \
963	fi
964
965# Generate some files
966# ---------------------------------------------------------------------------
967
968# KERNELRELEASE can change from a few different places, meaning version.h
969# needs to be updated, so this check is forced on all builds
970
971uts_len := 64
972define filechk_utsrelease.h
973	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
974	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
975	  exit 1;                                                         \
976	fi;                                                               \
977	(echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
978endef
979
980define filechk_version.h
981	(echo \#define LINUX_VERSION_CODE $(shell                             \
982	expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
983	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
984endef
985
986include/linux/version.h: $(srctree)/Makefile FORCE
987	$(call filechk,version.h)
988
989include/linux/utsrelease.h: include/config/kernel.release FORCE
990	$(call filechk,utsrelease.h)
991
992# ---------------------------------------------------------------------------
993
994PHONY += depend dep
995depend dep:
996	@echo '*** Warning: make $@ is unnecessary now.'
997
998# ---------------------------------------------------------------------------
999# Kernel headers
1000INSTALL_HDR_PATH=$(objtree)/usr
1001export INSTALL_HDR_PATH
1002
1003HDRFILTER=generic i386 x86_64
1004HDRARCHES=$(filter-out $(HDRFILTER),$(patsubst $(srctree)/include/asm-%/Kbuild,%,$(wildcard $(srctree)/include/asm-*/Kbuild)))
1005
1006PHONY += headers_install_all
1007headers_install_all: include/linux/version.h scripts_basic FORCE
1008	$(Q)$(MAKE) $(build)=scripts scripts/unifdef
1009	$(Q)for arch in $(HDRARCHES); do \
1010	 $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch ;\
1011	 done
1012
1013PHONY += headers_install
1014headers_install: include/linux/version.h scripts_basic FORCE
1015	@if [ ! -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1016	  echo '*** Error: Headers not exportable for this architecture ($(SRCARCH))'; \
1017	  exit 1 ; fi
1018	$(Q)$(MAKE) $(build)=scripts scripts/unifdef
1019	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include
1020
1021PHONY += headers_check_all
1022headers_check_all: headers_install_all
1023	$(Q)for arch in $(HDRARCHES); do \
1024	 $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch HDRCHECK=1 ;\
1025	 done
1026
1027PHONY += headers_check
1028headers_check: headers_install
1029	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include HDRCHECK=1
1030
1031# ---------------------------------------------------------------------------
1032# Modules
1033
1034ifdef CONFIG_MODULES
1035
1036# By default, build modules as well
1037
1038all: modules
1039
1040#	Build modules
1041#
1042#	A module can be listed more than once in obj-m resulting in
1043#	duplicate lines in modules.order files.  Those are removed
1044#	using awk while concatenating to the final file.
1045
1046PHONY += modules
1047modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1048	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1049	@echo '  Building modules, stage 2.';
1050	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1051
1052
1053# Target to prepare building external modules
1054PHONY += modules_prepare
1055modules_prepare: prepare scripts
1056
1057# Target to install modules
1058PHONY += modules_install
1059modules_install: _modinst_ _modinst_post
1060
1061PHONY += _modinst_
1062_modinst_:
1063	@if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1064		echo "Warning: you may need to install module-init-tools"; \
1065		echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1066		sleep 1; \
1067	fi
1068	@rm -rf $(MODLIB)/kernel
1069	@rm -f $(MODLIB)/source
1070	@mkdir -p $(MODLIB)/kernel
1071	@ln -s $(srctree) $(MODLIB)/source
1072	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1073		rm -f $(MODLIB)/build ; \
1074		ln -s $(objtree) $(MODLIB)/build ; \
1075	fi
1076	@cp -f $(objtree)/modules.order $(MODLIB)/
1077	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1078
1079# This depmod is only for convenience to give the initial
1080# boot a modules.dep even before / is mounted read-write.  However the
1081# boot script depmod is the master version.
1082PHONY += _modinst_post
1083_modinst_post: _modinst_
1084	$(call cmd,depmod)
1085
1086else # CONFIG_MODULES
1087
1088# Modules not configured
1089# ---------------------------------------------------------------------------
1090
1091modules modules_install: FORCE
1092	@echo
1093	@echo "The present kernel configuration has modules disabled."
1094	@echo "Type 'make config' and enable loadable module support."
1095	@echo "Then build a kernel with module support enabled."
1096	@echo
1097	@exit 1
1098
1099endif # CONFIG_MODULES
1100
1101###
1102# Cleaning is done on three levels.
1103# make clean     Delete most generated files
1104#                Leave enough to build external modules
1105# make mrproper  Delete the current configuration, and all generated files
1106# make distclean Remove editor backup files, patch leftover files and the like
1107
1108# Directories & files removed with 'make clean'
1109CLEAN_DIRS  += $(MODVERDIR)
1110CLEAN_FILES +=	vmlinux System.map \
1111                .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1112
1113# Directories & files removed with 'make mrproper'
1114MRPROPER_DIRS  += include/config include2 usr/include
1115MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1116                  include/linux/autoconf.h include/linux/version.h      \
1117                  include/linux/utsrelease.h                            \
1118                  include/linux/bounds.h include/asm*/asm-offsets.h     \
1119		  Module.symvers tags TAGS cscope*
1120
1121# clean - Delete most, but leave enough to build external modules
1122#
1123clean: rm-dirs  := $(CLEAN_DIRS)
1124clean: rm-files := $(CLEAN_FILES)
1125clean-dirs      := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
1126
1127PHONY += $(clean-dirs) clean archclean
1128$(clean-dirs):
1129	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1130
1131clean: archclean $(clean-dirs)
1132	$(call cmd,rmdirs)
1133	$(call cmd,rmfiles)
1134	@find . $(RCS_FIND_IGNORE) \
1135		\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1136		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1137		-o -name '*.symtypes' -o -name 'modules.order' \) \
1138		-type f -print | xargs rm -f
1139
1140# mrproper - Delete all generated files, including .config
1141#
1142mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1143mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1144mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1145
1146PHONY += $(mrproper-dirs) mrproper archmrproper
1147$(mrproper-dirs):
1148	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1149
1150mrproper: clean archmrproper $(mrproper-dirs)
1151	$(call cmd,rmdirs)
1152	$(call cmd,rmfiles)
1153
1154# distclean
1155#
1156PHONY += distclean
1157
1158distclean: mrproper
1159	@find $(srctree) $(RCS_FIND_IGNORE) \
1160		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1161		-o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1162		-o -name '.*.rej' -o -size 0 \
1163		-o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1164		-type f -print | xargs rm -f
1165
1166
1167# Packaging of the kernel to various formats
1168# ---------------------------------------------------------------------------
1169# rpm target kept for backward compatibility
1170package-dir	:= $(srctree)/scripts/package
1171
1172%pkg: include/config/kernel.release FORCE
1173	$(Q)$(MAKE) $(build)=$(package-dir) $@
1174rpm: include/config/kernel.release FORCE
1175	$(Q)$(MAKE) $(build)=$(package-dir) $@
1176
1177
1178# Brief documentation of the typical targets used
1179# ---------------------------------------------------------------------------
1180
1181boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1182boards := $(notdir $(boards))
1183board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1184board-dirs := $(sort $(notdir $(board-dirs:/=)))
1185
1186help:
1187	@echo  'Cleaning targets:'
1188	@echo  '  clean		  - Remove most generated files but keep the config and'
1189	@echo  '                    enough build support to build external modules'
1190	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1191	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
1192	@echo  ''
1193	@echo  'Configuration targets:'
1194	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1195	@echo  ''
1196	@echo  'Other generic targets:'
1197	@echo  '  all		  - Build all targets marked with [*]'
1198	@echo  '* vmlinux	  - Build the bare kernel'
1199	@echo  '* modules	  - Build all modules'
1200	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1201	@echo  '  dir/            - Build all files in dir and below'
1202	@echo  '  dir/file.[ois]  - Build specified target only'
1203	@echo  '  dir/file.ko     - Build module including final link'
1204	@echo  '  prepare         - Set up for building external modules'
1205	@echo  '  tags/TAGS	  - Generate tags file for editors'
1206	@echo  '  cscope	  - Generate cscope index'
1207	@echo  '  kernelrelease	  - Output the release version string'
1208	@echo  '  kernelversion	  - Output the version stored in Makefile'
1209	@if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1210	 echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1211	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1212	 fi
1213	@echo  ''
1214	@echo  'Static analysers'
1215	@echo  '  checkstack      - Generate a list of stack hogs'
1216	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1217	@echo  '  versioncheck    - Sanity check on version.h usage'
1218	@echo  '  includecheck    - Check for duplicate included header files'
1219	@echo  '  export_report   - List the usages of all exported symbols'
1220	@if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1221	 echo  '  headers_check   - Sanity check on exported headers'; \
1222	 fi
1223	@echo  ''
1224	@echo  'Kernel packaging:'
1225	@$(MAKE) $(build)=$(package-dir) help
1226	@echo  ''
1227	@echo  'Documentation targets:'
1228	@$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1229	@echo  ''
1230	@echo  'Architecture specific targets ($(SRCARCH)):'
1231	@$(if $(archhelp),$(archhelp),\
1232		echo '  No architecture specific help defined for $(SRCARCH)')
1233	@echo  ''
1234	@$(if $(boards), \
1235		$(foreach b, $(boards), \
1236		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1237		echo '')
1238	@$(if $(board-dirs), \
1239		$(foreach b, $(board-dirs), \
1240		printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1241		printf "  %-16s - Show all of the above\\n" help-boards; \
1242		echo '')
1243
1244	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1245	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1246	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1247	@echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1248	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1249	@echo  ''
1250	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
1251	@echo  'For further info see the ./README file'
1252
1253
1254help-board-dirs := $(addprefix help-,$(board-dirs))
1255
1256help-boards: $(help-board-dirs)
1257
1258boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1259
1260$(help-board-dirs): help-%:
1261	@echo  'Architecture specific targets ($(SRCARCH) $*):'
1262	@$(if $(boards-per-dir), \
1263		$(foreach b, $(boards-per-dir), \
1264		printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1265		echo '')
1266
1267
1268# Documentation targets
1269# ---------------------------------------------------------------------------
1270%docs: scripts_basic FORCE
1271	$(Q)$(MAKE) $(build)=Documentation/DocBook $@
1272
1273else # KBUILD_EXTMOD
1274
1275###
1276# External module support.
1277# When building external modules the kernel used as basis is considered
1278# read-only, and no consistency checks are made and the make
1279# system is not used on the basis kernel. If updates are required
1280# in the basis kernel ordinary make commands (without M=...) must
1281# be used.
1282#
1283# The following are the only valid targets when building external
1284# modules.
1285# make M=dir clean     Delete all automatically generated files
1286# make M=dir modules   Make all modules in specified dir
1287# make M=dir	       Same as 'make M=dir modules'
1288# make M=dir modules_install
1289#                      Install the modules built in the module directory
1290#                      Assumes install directory is already created
1291
1292# We are always building modules
1293KBUILD_MODULES := 1
1294PHONY += crmodverdir
1295crmodverdir:
1296	$(cmd_crmodverdir)
1297
1298PHONY += $(objtree)/Module.symvers
1299$(objtree)/Module.symvers:
1300	@test -e $(objtree)/Module.symvers || ( \
1301	echo; \
1302	echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1303	echo "           is missing; modules will have no dependencies and modversions."; \
1304	echo )
1305
1306module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1307PHONY += $(module-dirs) modules
1308$(module-dirs): crmodverdir $(objtree)/Module.symvers
1309	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1310
1311modules: $(module-dirs)
1312	@echo '  Building modules, stage 2.';
1313	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1314
1315PHONY += modules_install
1316modules_install: _emodinst_ _emodinst_post
1317
1318install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1319PHONY += _emodinst_
1320_emodinst_:
1321	$(Q)mkdir -p $(MODLIB)/$(install-dir)
1322	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1323
1324PHONY += _emodinst_post
1325_emodinst_post: _emodinst_
1326	$(call cmd,depmod)
1327
1328clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1329
1330PHONY += $(clean-dirs) clean
1331$(clean-dirs):
1332	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1333
1334clean:	rm-dirs := $(MODVERDIR)
1335clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1336clean: $(clean-dirs)
1337	$(call cmd,rmdirs)
1338	$(call cmd,rmfiles)
1339	@find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1340		\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1341		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1342		-type f -print | xargs rm -f
1343
1344help:
1345	@echo  '  Building external modules.'
1346	@echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1347	@echo  ''
1348	@echo  '  modules         - default target, build the module(s)'
1349	@echo  '  modules_install - install the module'
1350	@echo  '  clean           - remove generated files in module directory only'
1351	@echo  ''
1352
1353# Dummies...
1354PHONY += prepare scripts
1355prepare: ;
1356scripts: ;
1357endif # KBUILD_EXTMOD
1358
1359# Generate tags for editors
1360# ---------------------------------------------------------------------------
1361
1362#We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1363#(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1364#Adding $(srctree) adds about 20M on i386 to the size of the output file!
1365
1366ifeq ($(src),$(obj))
1367__srctree =
1368else
1369__srctree = $(srctree)/
1370endif
1371
1372ifeq ($(ALLSOURCE_ARCHS),)
1373ifeq ($(ARCH),um)
1374ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1375else
1376ALLINCLUDE_ARCHS := $(SRCARCH)
1377endif
1378else
1379#Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1380ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1381endif
1382
1383ALLSOURCE_ARCHS := $(SRCARCH)
1384
1385define find-sources
1386        ( for arch in $(ALLSOURCE_ARCHS) ; do \
1387	       find $(__srctree)arch/$${arch} $(RCS_FIND_IGNORE) \
1388	            -name $1 -print; \
1389	  done ; \
1390	  find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1391	       -name $1 -print; \
1392	  find $(__srctree)include $(RCS_FIND_IGNORE) \
1393	       \( -name config -o -name 'asm-*' \) -prune \
1394	       -o -name $1 -print; \
1395	  for arch in $(ALLINCLUDE_ARCHS) ; do \
1396	       find $(__srctree)include/asm-$${arch} $(RCS_FIND_IGNORE) \
1397	            -name $1 -print; \
1398	  done ; \
1399	  find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1400	       -name $1 -print; \
1401	  find $(__srctree) $(RCS_FIND_IGNORE) \
1402	       \( -name include -o -name arch -o -name '.tmp_*' \) -prune -o \
1403	       -name $1 -print; \
1404	  )
1405endef
1406
1407define all-sources
1408	$(call find-sources,'*.[chS]')
1409endef
1410define all-kconfigs
1411	$(call find-sources,'Kconfig*')
1412endef
1413define all-defconfigs
1414	$(call find-sources,'defconfig')
1415endef
1416
1417define xtags
1418	if $1 --version 2>&1 | grep -iq exuberant; then \
1419	    $(all-sources) | xargs $1 -a \
1420		-I __initdata,__exitdata,__acquires,__releases \
1421		-I __read_mostly,____cacheline_aligned,____cacheline_aligned_in_smp,____cacheline_internodealigned_in_smp \
1422		-I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1423		--extra=+f --c-kinds=+px \
1424		--regex-asm='/^ENTRY\(([^)]*)\).*/\1/'; \
1425	    $(all-kconfigs) | xargs $1 -a \
1426		--langdef=kconfig \
1427		--language-force=kconfig \
1428		--regex-kconfig='/^[[:blank:]]*(menu|)config[[:blank:]]+([[:alnum:]_]+)/\2/'; \
1429	    $(all-defconfigs) | xargs -r $1 -a \
1430		--langdef=dotconfig \
1431		--language-force=dotconfig \
1432		--regex-dotconfig='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'; \
1433	elif $1 --version 2>&1 | grep -iq emacs; then \
1434	    $(all-sources) | xargs $1 -a; \
1435	    $(all-kconfigs) | xargs $1 -a \
1436		--regex='/^[ \t]*\(\(menu\)*config\)[ \t]+\([a-zA-Z0-9_]+\)/\3/'; \
1437	    $(all-defconfigs) | xargs -r $1 -a \
1438		--regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'; \
1439	else \
1440	    $(all-sources) | xargs $1 -a; \
1441	fi
1442endef
1443
1444quiet_cmd_cscope-file = FILELST cscope.files
1445      cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1446
1447quiet_cmd_cscope = MAKE    cscope.out
1448      cmd_cscope = cscope -b
1449
1450cscope: FORCE
1451	$(call cmd,cscope-file)
1452	$(call cmd,cscope)
1453
1454quiet_cmd_TAGS = MAKE   $@
1455define cmd_TAGS
1456	rm -f $@; \
1457	$(call xtags,etags)
1458endef
1459
1460TAGS: FORCE
1461	$(call cmd,TAGS)
1462
1463quiet_cmd_tags = MAKE   $@
1464define cmd_tags
1465	rm -f $@; \
1466	$(call xtags,ctags)
1467endef
1468
1469tags: FORCE
1470	$(call cmd,tags)
1471
1472
1473# Scripts to check various things for consistency
1474# ---------------------------------------------------------------------------
1475
1476includecheck:
1477	find * $(RCS_FIND_IGNORE) \
1478		-name '*.[hcS]' -type f -print | sort \
1479		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1480
1481versioncheck:
1482	find * $(RCS_FIND_IGNORE) \
1483		-name '*.[hcS]' -type f -print | sort \
1484		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1485
1486namespacecheck:
1487	$(PERL) $(srctree)/scripts/namespace.pl
1488
1489export_report:
1490	$(PERL) $(srctree)/scripts/export_report.pl
1491
1492endif #ifeq ($(config-targets),1)
1493endif #ifeq ($(mixed-targets),1)
1494
1495PHONY += checkstack kernelrelease kernelversion
1496
1497# UML needs a little special treatment here.  It wants to use the host
1498# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1499# else wants $(ARCH), including people doing cross-builds, which means
1500# that $(SUBARCH) doesn't work here.
1501ifeq ($(ARCH), um)
1502CHECKSTACK_ARCH := $(SUBARCH)
1503else
1504CHECKSTACK_ARCH := $(ARCH)
1505endif
1506checkstack:
1507	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1508	$(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1509
1510kernelrelease:
1511	$(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1512	$(error kernelrelease not valid - run 'make prepare' to update it))
1513kernelversion:
1514	@echo $(KERNELVERSION)
1515
1516# Single targets
1517# ---------------------------------------------------------------------------
1518# Single targets are compatible with:
1519# - build with mixed source and output
1520# - build with separate output dir 'make O=...'
1521# - external modules
1522#
1523#  target-dir => where to store outputfile
1524#  build-dir  => directory in kernel source tree to use
1525
1526ifeq ($(KBUILD_EXTMOD),)
1527        build-dir  = $(patsubst %/,%,$(dir $@))
1528        target-dir = $(dir $@)
1529else
1530        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1531        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1532        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1533endif
1534
1535%.s: %.c prepare scripts FORCE
1536	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1537%.i: %.c prepare scripts FORCE
1538	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1539%.o: %.c prepare scripts FORCE
1540	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1541%.lst: %.c prepare scripts FORCE
1542	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1543%.s: %.S prepare scripts FORCE
1544	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1545%.o: %.S prepare scripts FORCE
1546	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1547%.symtypes: %.c prepare scripts FORCE
1548	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1549
1550# Modules
1551/ %/: prepare scripts FORCE
1552	$(cmd_crmodverdir)
1553	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1554	$(build)=$(build-dir)
1555%.ko: prepare scripts FORCE
1556	$(cmd_crmodverdir)
1557	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1558	$(build)=$(build-dir) $(@:.ko=.o)
1559	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1560
1561# FIXME Should go into a make.lib or something
1562# ===========================================================================
1563
1564quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1565      cmd_rmdirs = rm -rf $(rm-dirs)
1566
1567quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1568      cmd_rmfiles = rm -f $(rm-files)
1569
1570# Run depmod only if we have System.map and depmod is executable
1571quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1572      cmd_depmod = \
1573	if [ -r System.map -a -x $(DEPMOD) ]; then                              \
1574		$(DEPMOD) -ae -F System.map                                     \
1575		$(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) -r)   \
1576		$(KERNELRELEASE);                                               \
1577	fi
1578
1579# Create temporary dir for module support files
1580# clean it up only when building all modules
1581cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1582                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1583
1584a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1585	  $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \
1586	  $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1587
1588quiet_cmd_as_o_S = AS      $@
1589cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
1590
1591# read all saved command lines
1592
1593targets := $(wildcard $(sort $(targets)))
1594cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1595
1596ifneq ($(cmd_files),)
1597  $(cmd_files): ;	# Do not try to update included dependency files
1598  include $(cmd_files)
1599endif
1600
1601# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1602# Usage:
1603# $(Q)$(MAKE) $(clean)=dir
1604clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1605
1606endif	# skip-makefile
1607
1608PHONY += FORCE
1609FORCE:
1610
1611# Declare the contents of the .PHONY variable as phony.  We keep that
1612# information in a variable se we can use it in if_changed and friends.
1613.PHONY: $(PHONY)
1614