Root/Makefile

1VERSION = 2
2PATCHLEVEL = 6
3SUBLEVEL = 36
4EXTRAVERSION =
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),sparc64)
208       SRCARCH := sparc
209endif
210
211# Additional ARCH settings for sh
212ifeq ($(ARCH),sh64)
213       SRCARCH := sh
214endif
215
216# Where to locate arch specific headers
217hdr-arch := $(SRCARCH)
218
219ifeq ($(ARCH),m68knommu)
220       hdr-arch := m68k
221endif
222
223KCONFIG_CONFIG ?= .config
224
225# SHELL used by kbuild
226CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
227      else if [ -x /bin/bash ]; then echo /bin/bash; \
228      else echo sh; fi ; fi)
229
230HOSTCC = gcc
231HOSTCXX = g++
232HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
233HOSTCXXFLAGS = -O2
234
235# Decide whether to build built-in, modular, or both.
236# Normally, just do built-in.
237
238KBUILD_MODULES :=
239KBUILD_BUILTIN := 1
240
241# If we have only "make modules", don't compile built-in objects.
242# When we're building modules with modversions, we need to consider
243# the built-in objects during the descend as well, in order to
244# make sure the checksums are up to date before we record them.
245
246ifeq ($(MAKECMDGOALS),modules)
247  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
248endif
249
250# If we have "make <whatever> modules", compile modules
251# in addition to whatever we do anyway.
252# Just "make" or "make all" shall build modules as well
253
254ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
255  KBUILD_MODULES := 1
256endif
257
258ifeq ($(MAKECMDGOALS),)
259  KBUILD_MODULES := 1
260endif
261
262export KBUILD_MODULES KBUILD_BUILTIN
263export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
264
265# Beautify output
266# ---------------------------------------------------------------------------
267#
268# Normally, we echo the whole command before executing it. By making
269# that echo $($(quiet)$(cmd)), we now have the possibility to set
270# $(quiet) to choose other forms of output instead, e.g.
271#
272# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
273# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
274#
275# If $(quiet) is empty, the whole command will be printed.
276# If it is set to "quiet_", only the short version will be printed.
277# If it is set to "silent_", nothing will be printed at all, since
278# the variable $(silent_cmd_cc_o_c) doesn't exist.
279#
280# A simple variant is to prefix commands with $(Q) - that's useful
281# for commands that shall be hidden in non-verbose mode.
282#
283# $(Q)ln $@ :<
284#
285# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
286# If KBUILD_VERBOSE equals 1 then the above command is displayed.
287
288ifeq ($(KBUILD_VERBOSE),1)
289  quiet =
290  Q =
291else
292  quiet=quiet_
293  Q = @
294endif
295
296# If the user is running make -s (silent mode), suppress echoing of
297# commands
298
299ifneq ($(findstring s,$(MAKEFLAGS)),)
300  quiet=silent_
301endif
302
303export quiet Q KBUILD_VERBOSE
304
305
306# Look for make include files relative to root of kernel src
307MAKEFLAGS += --include-dir=$(srctree)
308
309# We need some generic definitions (do not try to remake the file).
310$(srctree)/scripts/Kbuild.include: ;
311include $(srctree)/scripts/Kbuild.include
312
313# Make variables (CC, etc...)
314
315AS = $(CROSS_COMPILE)as
316LD = $(CROSS_COMPILE)ld
317CC = $(CROSS_COMPILE)gcc
318CPP = $(CC) -E
319AR = $(CROSS_COMPILE)ar
320NM = $(CROSS_COMPILE)nm
321STRIP = $(CROSS_COMPILE)strip
322OBJCOPY = $(CROSS_COMPILE)objcopy
323OBJDUMP = $(CROSS_COMPILE)objdump
324AWK = awk
325GENKSYMS = scripts/genksyms/genksyms
326INSTALLKERNEL := installkernel
327DEPMOD = /sbin/depmod
328KALLSYMS = scripts/kallsyms
329PERL = perl
330CHECK = sparse
331
332CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
333          -Wbitwise -Wno-return-void $(CF)
334CFLAGS_MODULE =
335AFLAGS_MODULE =
336LDFLAGS_MODULE =
337CFLAGS_KERNEL =
338AFLAGS_KERNEL =
339CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
340
341
342# Use LINUXINCLUDE when you must reference the include/ directory.
343# Needed to be compatible with the O= option
344LINUXINCLUDE := -I$(srctree)/arch/$(hdr-arch)/include -Iinclude \
345                   $(if $(KBUILD_SRC), -I$(srctree)/include) \
346                   -include include/generated/autoconf.h
347
348KBUILD_CPPFLAGS := -D__KERNEL__
349
350KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
351           -fno-strict-aliasing -fno-common \
352           -Werror-implicit-function-declaration \
353           -Wno-format-security \
354           -fno-delete-null-pointer-checks
355KBUILD_AFLAGS_KERNEL :=
356KBUILD_CFLAGS_KERNEL :=
357KBUILD_AFLAGS := -D__ASSEMBLY__
358KBUILD_AFLAGS_MODULE := -DMODULE
359KBUILD_CFLAGS_MODULE := -DMODULE
360KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
361
362# Read KERNELRELEASE from include/config/kernel.release (if it exists)
363KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
364KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
365
366export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
367export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
368export CPP AR NM STRIP OBJCOPY OBJDUMP
369export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
370export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
371
372export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
373export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
374export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
375export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
376export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
377
378# When compiling out-of-tree modules, put MODVERDIR in the module
379# tree rather than in the kernel tree. The kernel tree might
380# even be read-only.
381export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
382
383# Files to ignore in find ... statements
384
385RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
386export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
387
388# ===========================================================================
389# Rules shared between *config targets and build targets
390
391# Basic helpers built in scripts/
392PHONY += scripts_basic
393scripts_basic:
394    $(Q)$(MAKE) $(build)=scripts/basic
395    $(Q)rm -f .tmp_quiet_recordmcount
396
397# To avoid any implicit rule to kick in, define an empty command.
398scripts/basic/%: scripts_basic ;
399
400PHONY += outputmakefile
401# outputmakefile generates a Makefile in the output directory, if using a
402# separate output directory. This allows convenient use of make in the
403# output directory.
404outputmakefile:
405ifneq ($(KBUILD_SRC),)
406    $(Q)ln -fsn $(srctree) source
407    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
408        $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
409endif
410
411# To make sure we do not include .config for any of the *config targets
412# catch them early, and hand them over to scripts/kconfig/Makefile
413# It is allowed to specify more targets when calling make, including
414# mixing *config targets and build targets.
415# For example 'make oldconfig all'.
416# Detect when mixed targets is specified, and make a second invocation
417# of make so .config is not included in this case either (for *config).
418
419no-dot-config-targets := clean mrproper distclean \
420             cscope TAGS tags help %docs check% coccicheck \
421             include/linux/version.h headers_% \
422             kernelversion %src-pkg
423
424config-targets := 0
425mixed-targets := 0
426dot-config := 1
427
428ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
429    ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
430        dot-config := 0
431    endif
432endif
433
434ifeq ($(KBUILD_EXTMOD),)
435        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
436                config-targets := 1
437                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
438                        mixed-targets := 1
439                endif
440        endif
441endif
442
443ifeq ($(mixed-targets),1)
444# ===========================================================================
445# We're called with mixed targets (*config and build targets).
446# Handle them one by one.
447
448%:: FORCE
449    $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
450
451else
452ifeq ($(config-targets),1)
453# ===========================================================================
454# *config targets only - make sure prerequisites are updated, and descend
455# in scripts/kconfig to make the *config target
456
457# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
458# KBUILD_DEFCONFIG may point out an alternative default configuration
459# used for 'make defconfig'
460include $(srctree)/arch/$(SRCARCH)/Makefile
461export KBUILD_DEFCONFIG KBUILD_KCONFIG
462
463config: scripts_basic outputmakefile FORCE
464    $(Q)mkdir -p include/linux include/config
465    $(Q)$(MAKE) $(build)=scripts/kconfig $@
466
467%config: scripts_basic outputmakefile FORCE
468    $(Q)mkdir -p include/linux include/config
469    $(Q)$(MAKE) $(build)=scripts/kconfig $@
470
471else
472# ===========================================================================
473# Build targets only - this includes vmlinux, arch specific targets, clean
474# targets and others. In general all targets except *config targets.
475
476ifeq ($(KBUILD_EXTMOD),)
477# Additional helpers built in scripts/
478# Carefully list dependencies so we do not try to build scripts twice
479# in parallel
480PHONY += scripts
481scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
482    $(Q)$(MAKE) $(build)=$(@)
483
484# Objects we will link into vmlinux / subdirs we need to visit
485init-y := init/
486drivers-y := drivers/ sound/ firmware/
487net-y := net/
488libs-y := lib/
489core-y := usr/
490endif # KBUILD_EXTMOD
491
492ifeq ($(dot-config),1)
493# Read in config
494-include include/config/auto.conf
495
496ifeq ($(KBUILD_EXTMOD),)
497# Read in dependencies to all Kconfig* files, make sure to run
498# oldconfig if changes are detected.
499-include include/config/auto.conf.cmd
500
501# To avoid any implicit rule to kick in, define an empty command
502$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
503
504# If .config is newer than include/config/auto.conf, someone tinkered
505# with it and forgot to run make oldconfig.
506# if auto.conf.cmd is missing then we are probably in a cleaned tree so
507# we execute the config step to be sure to catch updated Kconfig files
508include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
509    $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
510else
511# external modules needs include/generated/autoconf.h and include/config/auto.conf
512# but do not care if they are up-to-date. Use auto.conf to trigger the test
513PHONY += include/config/auto.conf
514
515include/config/auto.conf:
516    $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
517    echo; \
518    echo " ERROR: Kernel configuration is invalid."; \
519    echo " include/generated/autoconf.h or $@ are missing.";\
520    echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
521    echo; \
522    /bin/false)
523
524endif # KBUILD_EXTMOD
525
526else
527# Dummy target needed, because used as prerequisite
528include/config/auto.conf: ;
529endif # $(dot-config)
530
531# The all: target is the default when no target is given on the
532# command line.
533# This allow a user to issue only 'make' to build a kernel including modules
534# Defaults to vmlinux, but the arch makefile usually adds further targets
535all: vmlinux
536
537ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
538KBUILD_CFLAGS += -Os
539else
540KBUILD_CFLAGS += -O2
541endif
542
543include $(srctree)/arch/$(SRCARCH)/Makefile
544
545ifneq ($(CONFIG_FRAME_WARN),0)
546KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
547endif
548
549# Force gcc to behave correct even for buggy distributions
550ifndef CONFIG_CC_STACKPROTECTOR
551KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
552endif
553
554ifdef CONFIG_FRAME_POINTER
555KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
556else
557KBUILD_CFLAGS += -fomit-frame-pointer
558endif
559
560ifdef CONFIG_DEBUG_INFO
561KBUILD_CFLAGS += -g
562KBUILD_AFLAGS += -gdwarf-2
563endif
564
565ifdef CONFIG_DEBUG_INFO_REDUCED
566KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly)
567endif
568
569ifdef CONFIG_FUNCTION_TRACER
570KBUILD_CFLAGS += -pg
571endif
572
573# We trigger additional mismatches with less inlining
574ifdef CONFIG_DEBUG_SECTION_MISMATCH
575KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
576endif
577
578# arch Makefile may override CC so keep this after arch Makefile is included
579NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
580CHECKFLAGS += $(NOSTDINC_FLAGS)
581
582# warn about C99 declaration after statement
583KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
584
585# disable pointer signed / unsigned warnings in gcc 4.0
586KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
587
588# disable invalid "can't wrap" optimizations for signed / pointers
589KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
590
591# conserve stack if available
592KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
593
594# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
595# But warn user when we do so
596warn-assign = \
597$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
598
599ifneq ($(KCPPFLAGS),)
600        $(call warn-assign,CPPFLAGS)
601        KBUILD_CPPFLAGS += $(KCPPFLAGS)
602endif
603ifneq ($(KAFLAGS),)
604        $(call warn-assign,AFLAGS)
605        KBUILD_AFLAGS += $(KAFLAGS)
606endif
607ifneq ($(KCFLAGS),)
608        $(call warn-assign,CFLAGS)
609        KBUILD_CFLAGS += $(KCFLAGS)
610endif
611
612# Use --build-id when available.
613LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
614                  $(call cc-ldoption, -Wl$(comma)--build-id,))
615KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
616LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
617
618ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
619LDFLAGS_vmlinux += $(call ld-option, -X,)
620endif
621
622# Default kernel image to build when no specific target is given.
623# KBUILD_IMAGE may be overruled on the command line or
624# set in the environment
625# Also any assignments in arch/$(ARCH)/Makefile take precedence over
626# this default value
627export KBUILD_IMAGE ?= vmlinux
628
629#
630# INSTALL_PATH specifies where to place the updated kernel and system map
631# images. Default is /boot, but you can set it to other values
632export INSTALL_PATH ?= /boot
633
634#
635# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
636# relocations required by build roots. This is not defined in the
637# makefile but the argument can be passed to make if needed.
638#
639
640MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
641export MODLIB
642
643#
644# INSTALL_MOD_STRIP, if defined, will cause modules to be
645# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
646# the default option --strip-debug will be used. Otherwise,
647# INSTALL_MOD_STRIP will used as the options to the strip command.
648
649ifdef INSTALL_MOD_STRIP
650ifeq ($(INSTALL_MOD_STRIP),1)
651mod_strip_cmd = $(STRIP) --strip-debug
652else
653mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
654endif # INSTALL_MOD_STRIP=1
655else
656mod_strip_cmd = true
657endif # INSTALL_MOD_STRIP
658export mod_strip_cmd
659
660
661ifeq ($(KBUILD_EXTMOD),)
662core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
663
664vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
665             $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
666             $(net-y) $(net-m) $(libs-y) $(libs-m)))
667
668vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
669             $(init-n) $(init-) \
670             $(core-n) $(core-) $(drivers-n) $(drivers-) \
671             $(net-n) $(net-) $(libs-n) $(libs-))))
672
673init-y := $(patsubst %/, %/built-in.o, $(init-y))
674core-y := $(patsubst %/, %/built-in.o, $(core-y))
675drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
676net-y := $(patsubst %/, %/built-in.o, $(net-y))
677libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
678libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
679libs-y := $(libs-y1) $(libs-y2)
680
681# Build vmlinux
682# ---------------------------------------------------------------------------
683# vmlinux is built from the objects selected by $(vmlinux-init) and
684# $(vmlinux-main). Most are built-in.o files from top-level directories
685# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
686# Ordering when linking is important, and $(vmlinux-init) must be first.
687#
688# vmlinux
689# ^
690# |
691# +-< $(vmlinux-init)
692# | +--< init/version.o + more
693# |
694# +--< $(vmlinux-main)
695# | +--< driver/built-in.o mm/built-in.o + more
696# |
697# +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
698#
699# vmlinux version (uname -v) cannot be updated during normal
700# descending-into-subdirs phase since we do not yet know if we need to
701# update vmlinux.
702# Therefore this step is delayed until just before final link of vmlinux -
703# except in the kallsyms case where it is done just before adding the
704# symbols to the kernel.
705#
706# System.map is generated to document addresses of all kernel symbols
707
708vmlinux-init := $(head-y) $(init-y)
709vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
710vmlinux-all := $(vmlinux-init) $(vmlinux-main)
711vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
712export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
713
714# Rule to link vmlinux - also used during CONFIG_KALLSYMS
715# May be overridden by arch/$(ARCH)/Makefile
716quiet_cmd_vmlinux__ ?= LD $@
717      cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
718      -T $(vmlinux-lds) $(vmlinux-init) \
719      --start-group $(vmlinux-main) --end-group \
720      $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
721
722# Generate new vmlinux version
723quiet_cmd_vmlinux_version = GEN .version
724      cmd_vmlinux_version = set -e; \
725    if [ ! -r .version ]; then \
726      rm -f .version; \
727      echo 1 >.version; \
728    else \
729      mv .version .old_version; \
730      expr 0$$(cat .old_version) + 1 >.version; \
731    fi; \
732    $(MAKE) $(build)=init
733
734# Generate System.map
735quiet_cmd_sysmap = SYSMAP
736      cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
737
738# Link of vmlinux
739# If CONFIG_KALLSYMS is set .version is already updated
740# Generate System.map and verify that the content is consistent
741# Use + in front of the vmlinux_version rule to silent warning with make -j2
742# First command is ':' to allow us to use + in front of the rule
743define rule_vmlinux__
744    :
745    $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
746
747    $(call cmd,vmlinux__)
748    $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
749
750    $(Q)$(if $($(quiet)cmd_sysmap), \
751      echo ' $($(quiet)cmd_sysmap) System.map' &&) \
752    $(cmd_sysmap) $@ System.map; \
753    if [ $$? -ne 0 ]; then \
754        rm -f $@; \
755        /bin/false; \
756    fi;
757    $(verify_kallsyms)
758endef
759
760
761ifdef CONFIG_KALLSYMS
762# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
763# It's a three stage process:
764# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
765# empty
766# Running kallsyms on that gives us .tmp_kallsyms1.o with
767# the right size - vmlinux version (uname -v) is updated during this step
768# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
769# but due to the added section, some addresses have shifted.
770# From here, we generate a correct .tmp_kallsyms2.o
771# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
772# o Verify that the System.map from vmlinux matches the map from
773# .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
774# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
775# .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
776# temporary bypass to allow the kernel to be built while the
777# maintainers work out what went wrong with kallsyms.
778
779ifdef CONFIG_KALLSYMS_EXTRA_PASS
780last_kallsyms := 3
781else
782last_kallsyms := 2
783endif
784
785kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
786
787define verify_kallsyms
788    $(Q)$(if $($(quiet)cmd_sysmap), \
789      echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
790      $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
791    $(Q)cmp -s System.map .tmp_System.map || \
792        (echo Inconsistent kallsyms data; \
793         echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
794         rm .tmp_kallsyms* ; /bin/false )
795endef
796
797# Update vmlinux version before link
798# Use + in front of this rule to silent warning about make -j1
799# First command is ':' to allow us to use + in front of this rule
800cmd_ksym_ld = $(cmd_vmlinux__)
801define rule_ksym_ld
802    :
803    +$(call cmd,vmlinux_version)
804    $(call cmd,vmlinux__)
805    $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
806endef
807
808# Generate .S file with all kernel symbols
809quiet_cmd_kallsyms = KSYM $@
810      cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
811                     $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
812
813.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
814    $(call if_changed_dep,as_o_S)
815
816.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
817    $(call cmd,kallsyms)
818
819# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
820.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
821    $(call if_changed_rule,ksym_ld)
822
823.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
824    $(call if_changed,vmlinux__)
825
826.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
827    $(call if_changed,vmlinux__)
828
829# Needs to visit scripts/ before $(KALLSYMS) can be used.
830$(KALLSYMS): scripts ;
831
832# Generate some data for debugging strange kallsyms problems
833debug_kallsyms: .tmp_map$(last_kallsyms)
834
835.tmp_map%: .tmp_vmlinux% FORCE
836    ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
837
838.tmp_map3: .tmp_map2
839
840.tmp_map2: .tmp_map1
841
842endif # ifdef CONFIG_KALLSYMS
843
844# Do modpost on a prelinked vmlinux. The finally linked vmlinux has
845# relevant sections renamed as per the linker script.
846quiet_cmd_vmlinux-modpost = LD $@
847      cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
848     $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
849     $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
850define rule_vmlinux-modpost
851    :
852    +$(call cmd,vmlinux-modpost)
853    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
854    $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
855endef
856
857# vmlinux image - including updated kernel symbols
858vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
859ifdef CONFIG_HEADERS_CHECK
860    $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
861endif
862ifdef CONFIG_SAMPLES
863    $(Q)$(MAKE) $(build)=samples
864endif
865ifdef CONFIG_BUILD_DOCSRC
866    $(Q)$(MAKE) $(build)=Documentation
867endif
868    $(call vmlinux-modpost)
869    $(call if_changed_rule,vmlinux__)
870    $(Q)rm -f .old_version
871
872# build vmlinux.o first to catch section mismatch errors early
873ifdef CONFIG_KALLSYMS
874.tmp_vmlinux1: vmlinux.o
875endif
876
877modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
878vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
879    $(call if_changed_rule,vmlinux-modpost)
880
881# The actual objects are generated when descending,
882# make sure no implicit rule kicks in
883$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
884
885# Handle descending into subdirectories listed in $(vmlinux-dirs)
886# Preset locale variables to speed up the build process. Limit locale
887# tweaks to this spot to avoid wrong language settings when running
888# make menuconfig etc.
889# Error messages still appears in the original language
890
891PHONY += $(vmlinux-dirs)
892$(vmlinux-dirs): prepare scripts
893    $(Q)$(MAKE) $(build)=$@
894
895# Store (new) KERNELRELASE string in include/config/kernel.release
896include/config/kernel.release: include/config/auto.conf FORCE
897    $(Q)rm -f $@
898    $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
899
900
901# Things we need to do before we recursively start building the kernel
902# or the modules are listed in "prepare".
903# A multi level approach is used. prepareN is processed before prepareN-1.
904# archprepare is used in arch Makefiles and when processed asm symlink,
905# version.h and scripts_basic is processed / created.
906
907# Listed in dependency order
908PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
909
910# prepare3 is used to check if we are building in a separate output directory,
911# and if so do:
912# 1) Check that make has not been executed in the kernel src $(srctree)
913prepare3: include/config/kernel.release
914ifneq ($(KBUILD_SRC),)
915    @$(kecho) ' 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;
921endif
922
923# prepare2 creates a makefile if using a separate output directory
924prepare2: prepare3 outputmakefile
925
926prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
927                   include/config/auto.conf
928    $(cmd_crmodverdir)
929
930archprepare: prepare1 scripts_basic
931
932prepare0: archprepare FORCE
933    $(Q)$(MAKE) $(build)=.
934    $(Q)$(MAKE) $(build)=. missing-syscalls
935
936# All the preparing..
937prepare: prepare0
938
939# Generate some files
940# ---------------------------------------------------------------------------
941
942# KERNELRELEASE can change from a few different places, meaning version.h
943# needs to be updated, so this check is forced on all builds
944
945uts_len := 64
946define filechk_utsrelease.h
947    if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
948      echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
949      exit 1; \
950    fi; \
951    (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
952endef
953
954define filechk_version.h
955    (echo \#define LINUX_VERSION_CODE $(shell \
956    expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
957    echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
958endef
959
960include/linux/version.h: $(srctree)/Makefile FORCE
961    $(call filechk,version.h)
962
963include/generated/utsrelease.h: include/config/kernel.release FORCE
964    $(call filechk,utsrelease.h)
965
966PHONY += headerdep
967headerdep:
968    $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
969
970# ---------------------------------------------------------------------------
971
972PHONY += depend dep
973depend dep:
974    @echo '*** Warning: make $@ is unnecessary now.'
975
976# ---------------------------------------------------------------------------
977# Firmware install
978INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
979export INSTALL_FW_PATH
980
981PHONY += firmware_install
982firmware_install: FORCE
983    @mkdir -p $(objtree)/firmware
984    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
985
986# ---------------------------------------------------------------------------
987# Kernel headers
988
989#Default location for installed headers
990export INSTALL_HDR_PATH = $(objtree)/usr
991
992hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
993
994# If we do an all arch process set dst to asm-$(hdr-arch)
995hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
996
997PHONY += __headers
998__headers: include/linux/version.h scripts_basic FORCE
999    $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1000
1001PHONY += headers_install_all
1002headers_install_all:
1003    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1004
1005PHONY += headers_install
1006headers_install: __headers
1007    $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1008    $(error Headers not exportable for the $(SRCARCH) architecture))
1009    $(Q)$(MAKE) $(hdr-inst)=include
1010    $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1011
1012PHONY += headers_check_all
1013headers_check_all: headers_install_all
1014    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1015
1016PHONY += headers_check
1017headers_check: headers_install
1018    $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1019    $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1020
1021# ---------------------------------------------------------------------------
1022# Modules
1023
1024ifdef CONFIG_MODULES
1025
1026# By default, build modules as well
1027
1028all: modules
1029
1030# Build modules
1031#
1032# A module can be listed more than once in obj-m resulting in
1033# duplicate lines in modules.order files. Those are removed
1034# using awk while concatenating to the final file.
1035
1036PHONY += modules
1037modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1038    $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1039    @$(kecho) ' Building modules, stage 2.';
1040    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1041    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1042
1043modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1044    $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1045
1046%/modules.builtin: include/config/auto.conf
1047    $(Q)$(MAKE) $(modbuiltin)=$*
1048
1049
1050# Target to prepare building external modules
1051PHONY += modules_prepare
1052modules_prepare: prepare scripts
1053
1054# Target to install modules
1055PHONY += modules_install
1056modules_install: _modinst_ _modinst_post
1057
1058PHONY += _modinst_
1059_modinst_:
1060    @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1061        echo "Warning: you may need to install module-init-tools"; \
1062        echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1063        sleep 1; \
1064    fi
1065    @rm -rf $(MODLIB)/kernel
1066    @rm -f $(MODLIB)/source
1067    @mkdir -p $(MODLIB)/kernel
1068    @ln -s $(srctree) $(MODLIB)/source
1069    @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1070        rm -f $(MODLIB)/build ; \
1071        ln -s $(objtree) $(MODLIB)/build ; \
1072    fi
1073    @cp -f $(objtree)/modules.order $(MODLIB)/
1074    @cp -f $(objtree)/modules.builtin $(MODLIB)/
1075    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1076
1077# This depmod is only for convenience to give the initial
1078# boot a modules.dep even before / is mounted read-write. However the
1079# boot script depmod is the master version.
1080PHONY += _modinst_post
1081_modinst_post: _modinst_
1082    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1083    $(call cmd,depmod)
1084
1085else # CONFIG_MODULES
1086
1087# Modules not configured
1088# ---------------------------------------------------------------------------
1089
1090modules modules_install: FORCE
1091    @echo
1092    @echo "The present kernel configuration has modules disabled."
1093    @echo "Type 'make config' and enable loadable module support."
1094    @echo "Then build a kernel with module support enabled."
1095    @echo
1096    @exit 1
1097
1098endif # CONFIG_MODULES
1099
1100###
1101# Cleaning is done on three levels.
1102# make clean Delete most generated files
1103# Leave enough to build external modules
1104# make mrproper Delete the current configuration, and all generated files
1105# make distclean Remove editor backup files, patch leftover files and the like
1106
1107# Directories & files removed with 'make clean'
1108CLEAN_DIRS += $(MODVERDIR)
1109CLEAN_FILES += vmlinux System.map \
1110                .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1111
1112# Directories & files removed with 'make mrproper'
1113MRPROPER_DIRS += include/config usr/include include/generated
1114MRPROPER_FILES += .config .config.old .version .old_version \
1115                  include/linux/version.h \
1116          Module.symvers tags TAGS cscope*
1117
1118# clean - Delete most, but leave enough to build external modules
1119#
1120clean: rm-dirs := $(CLEAN_DIRS)
1121clean: rm-files := $(CLEAN_FILES)
1122clean-dirs := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1123
1124PHONY += $(clean-dirs) clean archclean
1125$(clean-dirs):
1126    $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1127
1128clean: archclean $(clean-dirs)
1129    $(call cmd,rmdirs)
1130    $(call cmd,rmfiles)
1131    @find . $(RCS_FIND_IGNORE) \
1132        \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1133        -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1134        -o -name '*.symtypes' -o -name 'modules.order' \
1135        -o -name modules.builtin -o -name '.tmp_*.o.*' \
1136        -o -name '*.gcno' \) -type f -print | xargs rm -f
1137
1138# mrproper - Delete all generated files, including .config
1139#
1140mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1141mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1142mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1143
1144PHONY += $(mrproper-dirs) mrproper archmrproper
1145$(mrproper-dirs):
1146    $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1147
1148mrproper: clean archmrproper $(mrproper-dirs)
1149    $(call cmd,rmdirs)
1150    $(call cmd,rmfiles)
1151
1152# distclean
1153#
1154PHONY += distclean
1155
1156distclean: mrproper
1157    @find $(srctree) $(RCS_FIND_IGNORE) \
1158        \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1159        -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1160        -o -name '.*.rej' -o -size 0 \
1161        -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1162        -type f -print | xargs rm -f
1163
1164
1165# Packaging of the kernel to various formats
1166# ---------------------------------------------------------------------------
1167# rpm target kept for backward compatibility
1168package-dir := $(srctree)/scripts/package
1169
1170%src-pkg: FORCE
1171    $(Q)$(MAKE) $(build)=$(package-dir) $@
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 ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1202    @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1203    @echo ' dir/ - Build all files in dir and below'
1204    @echo ' dir/file.[oisS] - Build specified target only'
1205    @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1206    @echo ' (requires a recent binutils and recent build (System.map))'
1207    @echo ' dir/file.ko - Build module including final link'
1208    @echo ' modules_prepare - Set up for building external modules'
1209    @echo ' tags/TAGS - Generate tags file for editors'
1210    @echo ' cscope - Generate cscope index'
1211    @echo ' kernelrelease - Output the release version string'
1212    @echo ' kernelversion - Output the version stored in Makefile'
1213    @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1214     echo ' (default: $(INSTALL_HDR_PATH))'; \
1215     echo ''
1216    @echo 'Static analysers'
1217    @echo ' checkstack - Generate a list of stack hogs'
1218    @echo ' namespacecheck - Name space analysis on compiled kernel'
1219    @echo ' versioncheck - Sanity check on version.h usage'
1220    @echo ' includecheck - Check for duplicate included header files'
1221    @echo ' export_report - List the usages of all exported symbols'
1222    @echo ' headers_check - Sanity check on exported headers'
1223    @echo ' headerdep - Detect inclusion cycles in headers'
1224    @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1225    @echo ''
1226    @echo 'Kernel packaging:'
1227    @$(MAKE) $(build)=$(package-dir) help
1228    @echo ''
1229    @echo 'Documentation targets:'
1230    @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1231    @echo ''
1232    @echo 'Architecture specific targets ($(SRCARCH)):'
1233    @$(if $(archhelp),$(archhelp),\
1234        echo ' No architecture specific help defined for $(SRCARCH)')
1235    @echo ''
1236    @$(if $(boards), \
1237        $(foreach b, $(boards), \
1238        printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1239        echo '')
1240    @$(if $(board-dirs), \
1241        $(foreach b, $(board-dirs), \
1242        printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1243        printf " %-16s - Show all of the above\\n" help-boards; \
1244        echo '')
1245
1246    @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1247    @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1248    @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1249    @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1250    @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1251    @echo ''
1252    @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1253    @echo 'For further info see the ./README file'
1254
1255
1256help-board-dirs := $(addprefix help-,$(board-dirs))
1257
1258help-boards: $(help-board-dirs)
1259
1260boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1261
1262$(help-board-dirs): help-%:
1263    @echo 'Architecture specific targets ($(SRCARCH) $*):'
1264    @$(if $(boards-per-dir), \
1265        $(foreach b, $(boards-per-dir), \
1266        printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1267        echo '')
1268
1269
1270# Documentation targets
1271# ---------------------------------------------------------------------------
1272%docs: scripts_basic FORCE
1273    $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1274
1275else # KBUILD_EXTMOD
1276
1277###
1278# External module support.
1279# When building external modules the kernel used as basis is considered
1280# read-only, and no consistency checks are made and the make
1281# system is not used on the basis kernel. If updates are required
1282# in the basis kernel ordinary make commands (without M=...) must
1283# be used.
1284#
1285# The following are the only valid targets when building external
1286# modules.
1287# make M=dir clean Delete all automatically generated files
1288# make M=dir modules Make all modules in specified dir
1289# make M=dir Same as 'make M=dir modules'
1290# make M=dir modules_install
1291# Install the modules built in the module directory
1292# Assumes install directory is already created
1293
1294# We are always building modules
1295KBUILD_MODULES := 1
1296PHONY += crmodverdir
1297crmodverdir:
1298    $(cmd_crmodverdir)
1299
1300PHONY += $(objtree)/Module.symvers
1301$(objtree)/Module.symvers:
1302    @test -e $(objtree)/Module.symvers || ( \
1303    echo; \
1304    echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1305    echo " is missing; modules will have no dependencies and modversions."; \
1306    echo )
1307
1308module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1309PHONY += $(module-dirs) modules
1310$(module-dirs): crmodverdir $(objtree)/Module.symvers
1311    $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1312
1313modules: $(module-dirs)
1314    @$(kecho) ' Building modules, stage 2.';
1315    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1316
1317PHONY += modules_install
1318modules_install: _emodinst_ _emodinst_post
1319
1320install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1321PHONY += _emodinst_
1322_emodinst_:
1323    $(Q)mkdir -p $(MODLIB)/$(install-dir)
1324    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1325
1326PHONY += _emodinst_post
1327_emodinst_post: _emodinst_
1328    $(call cmd,depmod)
1329
1330clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1331
1332PHONY += $(clean-dirs) clean
1333$(clean-dirs):
1334    $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1335
1336clean: rm-dirs := $(MODVERDIR)
1337clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers \
1338                   $(KBUILD_EXTMOD)/modules.order \
1339                   $(KBUILD_EXTMOD)/modules.builtin
1340clean: $(clean-dirs)
1341    $(call cmd,rmdirs)
1342    $(call cmd,rmfiles)
1343    @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1344        \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1345        -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1346        -o -name '*.gcno' \) -type f -print | xargs rm -f
1347
1348help:
1349    @echo ' Building external modules.'
1350    @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1351    @echo ''
1352    @echo ' modules - default target, build the module(s)'
1353    @echo ' modules_install - install the module'
1354    @echo ' clean - remove generated files in module directory only'
1355    @echo ''
1356
1357# Dummies...
1358PHONY += prepare scripts
1359prepare: ;
1360scripts: ;
1361endif # KBUILD_EXTMOD
1362
1363# Generate tags for editors
1364# ---------------------------------------------------------------------------
1365quiet_cmd_tags = GEN $@
1366      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1367
1368tags TAGS cscope: FORCE
1369    $(call cmd,tags)
1370
1371# Scripts to check various things for consistency
1372# ---------------------------------------------------------------------------
1373
1374includecheck:
1375    find * $(RCS_FIND_IGNORE) \
1376        -name '*.[hcS]' -type f -print | sort \
1377        | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1378
1379versioncheck:
1380    find * $(RCS_FIND_IGNORE) \
1381        -name '*.[hcS]' -type f -print | sort \
1382        | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1383
1384coccicheck:
1385    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1386
1387namespacecheck:
1388    $(PERL) $(srctree)/scripts/namespace.pl
1389
1390export_report:
1391    $(PERL) $(srctree)/scripts/export_report.pl
1392
1393endif #ifeq ($(config-targets),1)
1394endif #ifeq ($(mixed-targets),1)
1395
1396PHONY += checkstack kernelrelease kernelversion
1397
1398# UML needs a little special treatment here. It wants to use the host
1399# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1400# else wants $(ARCH), including people doing cross-builds, which means
1401# that $(SUBARCH) doesn't work here.
1402ifeq ($(ARCH), um)
1403CHECKSTACK_ARCH := $(SUBARCH)
1404else
1405CHECKSTACK_ARCH := $(ARCH)
1406endif
1407checkstack:
1408    $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1409    $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1410
1411kernelrelease:
1412    @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1413
1414kernelversion:
1415    @echo $(KERNELVERSION)
1416
1417# Single targets
1418# ---------------------------------------------------------------------------
1419# Single targets are compatible with:
1420# - build with mixed source and output
1421# - build with separate output dir 'make O=...'
1422# - external modules
1423#
1424# target-dir => where to store outputfile
1425# build-dir => directory in kernel source tree to use
1426
1427ifeq ($(KBUILD_EXTMOD),)
1428        build-dir = $(patsubst %/,%,$(dir $@))
1429        target-dir = $(dir $@)
1430else
1431        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1432        build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1433        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1434endif
1435
1436%.s: %.c prepare scripts FORCE
1437    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1438%.i: %.c prepare scripts FORCE
1439    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1440%.o: %.c prepare scripts FORCE
1441    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1442%.lst: %.c prepare scripts FORCE
1443    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1444%.s: %.S prepare scripts FORCE
1445    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1446%.o: %.S prepare scripts FORCE
1447    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1448%.symtypes: %.c prepare scripts FORCE
1449    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1450
1451# Modules
1452/: prepare scripts FORCE
1453    $(cmd_crmodverdir)
1454    $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1455    $(build)=$(build-dir)
1456%/: prepare scripts FORCE
1457    $(cmd_crmodverdir)
1458    $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1459    $(build)=$(build-dir)
1460%.ko: prepare scripts FORCE
1461    $(cmd_crmodverdir)
1462    $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1463    $(build)=$(build-dir) $(@:.ko=.o)
1464    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1465
1466# FIXME Should go into a make.lib or something
1467# ===========================================================================
1468
1469quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1470      cmd_rmdirs = rm -rf $(rm-dirs)
1471
1472quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1473      cmd_rmfiles = rm -f $(rm-files)
1474
1475# Run depmod only if we have System.map and depmod is executable
1476quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1477      cmd_depmod = \
1478    if [ -r System.map -a -x $(DEPMOD) ]; then \
1479        $(DEPMOD) -ae -F System.map \
1480        $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) ) \
1481        $(KERNELRELEASE); \
1482    fi
1483
1484# Create temporary dir for module support files
1485# clean it up only when building all modules
1486cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1487                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1488
1489a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1490      $(KBUILD_AFLAGS_KERNEL) \
1491      $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1492      $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1493
1494quiet_cmd_as_o_S = AS $@
1495cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1496
1497# read all saved command lines
1498
1499targets := $(wildcard $(sort $(targets)))
1500cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1501
1502ifneq ($(cmd_files),)
1503  $(cmd_files): ; # Do not try to update included dependency files
1504  include $(cmd_files)
1505endif
1506
1507# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1508# Usage:
1509# $(Q)$(MAKE) $(clean)=dir
1510clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1511
1512endif # skip-makefile
1513
1514PHONY += FORCE
1515FORCE:
1516
1517# Declare the contents of the .PHONY variable as phony. We keep that
1518# information in a variable so we can use it in if_changed and friends.
1519.PHONY: $(PHONY)
1520

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