Root/Makefile

Source at commit 6c17a31f1fc515425221067cb3ece599c09dbc5d created 9 years 4 months ago.
By Werner Almesberger, atusb, atben: moved from spi/ to ieee802154/; renamed atusb to spi_atusb
1VERSION = 2
2PATCHLEVEL = 6
3SUBLEVEL = 38
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),sparc32)
208       SRCARCH := sparc
209endif
210ifeq ($(ARCH),sparc64)
211       SRCARCH := sparc
212endif
213
214# Additional ARCH settings for sh
215ifeq ($(ARCH),sh64)
216       SRCARCH := sh
217endif
218
219# Where to locate arch specific headers
220hdr-arch := $(SRCARCH)
221
222ifeq ($(ARCH),m68knommu)
223       hdr-arch := m68k
224endif
225
226KCONFIG_CONFIG ?= .config
227export KCONFIG_CONFIG
228
229# SHELL used by kbuild
230CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
231      else if [ -x /bin/bash ]; then echo /bin/bash; \
232      else echo sh; fi ; fi)
233
234HOSTCC = gcc
235HOSTCXX = g++
236HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
237HOSTCXXFLAGS = -O2
238
239# Decide whether to build built-in, modular, or both.
240# Normally, just do built-in.
241
242KBUILD_MODULES :=
243KBUILD_BUILTIN := 1
244
245# If we have only "make modules", don't compile built-in objects.
246# When we're building modules with modversions, we need to consider
247# the built-in objects during the descend as well, in order to
248# make sure the checksums are up to date before we record them.
249
250ifeq ($(MAKECMDGOALS),modules)
251  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
252endif
253
254# If we have "make <whatever> modules", compile modules
255# in addition to whatever we do anyway.
256# Just "make" or "make all" shall build modules as well
257
258ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
259  KBUILD_MODULES := 1
260endif
261
262ifeq ($(MAKECMDGOALS),)
263  KBUILD_MODULES := 1
264endif
265
266export KBUILD_MODULES KBUILD_BUILTIN
267export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
268
269# Beautify output
270# ---------------------------------------------------------------------------
271#
272# Normally, we echo the whole command before executing it. By making
273# that echo $($(quiet)$(cmd)), we now have the possibility to set
274# $(quiet) to choose other forms of output instead, e.g.
275#
276# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
277# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
278#
279# If $(quiet) is empty, the whole command will be printed.
280# If it is set to "quiet_", only the short version will be printed.
281# If it is set to "silent_", nothing will be printed at all, since
282# the variable $(silent_cmd_cc_o_c) doesn't exist.
283#
284# A simple variant is to prefix commands with $(Q) - that's useful
285# for commands that shall be hidden in non-verbose mode.
286#
287# $(Q)ln $@ :<
288#
289# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
290# If KBUILD_VERBOSE equals 1 then the above command is displayed.
291
292ifeq ($(KBUILD_VERBOSE),1)
293  quiet =
294  Q =
295else
296  quiet=quiet_
297  Q = @
298endif
299
300# If the user is running make -s (silent mode), suppress echoing of
301# commands
302
303ifneq ($(findstring s,$(MAKEFLAGS)),)
304  quiet=silent_
305endif
306
307export quiet Q KBUILD_VERBOSE
308
309
310# Look for make include files relative to root of kernel src
311MAKEFLAGS += --include-dir=$(srctree)
312
313# We need some generic definitions (do not try to remake the file).
314$(srctree)/scripts/Kbuild.include: ;
315include $(srctree)/scripts/Kbuild.include
316
317# Make variables (CC, etc...)
318
319AS = $(CROSS_COMPILE)as
320LD = $(CROSS_COMPILE)ld
321CC = $(CROSS_COMPILE)gcc
322CPP = $(CC) -E
323AR = $(CROSS_COMPILE)ar
324NM = $(CROSS_COMPILE)nm
325STRIP = $(CROSS_COMPILE)strip
326OBJCOPY = $(CROSS_COMPILE)objcopy
327OBJDUMP = $(CROSS_COMPILE)objdump
328AWK = awk
329GENKSYMS = scripts/genksyms/genksyms
330INSTALLKERNEL := installkernel
331DEPMOD = /sbin/depmod
332KALLSYMS = scripts/kallsyms
333PERL = perl
334CHECK = sparse
335
336CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
337          -Wbitwise -Wno-return-void $(CF)
338CFLAGS_MODULE =
339AFLAGS_MODULE =
340LDFLAGS_MODULE =
341CFLAGS_KERNEL =
342AFLAGS_KERNEL =
343CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
344
345
346# Use LINUXINCLUDE when you must reference the include/ directory.
347# Needed to be compatible with the O= option
348LINUXINCLUDE := -I$(srctree)/arch/$(hdr-arch)/include -Iinclude \
349                   $(if $(KBUILD_SRC), -I$(srctree)/include) \
350                   -include include/generated/autoconf.h
351
352KBUILD_CPPFLAGS := -D__KERNEL__
353
354KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
355           -fno-strict-aliasing -fno-common \
356           -Werror-implicit-function-declaration \
357           -Wno-format-security \
358           -fno-delete-null-pointer-checks
359KBUILD_AFLAGS_KERNEL :=
360KBUILD_CFLAGS_KERNEL :=
361KBUILD_AFLAGS := -D__ASSEMBLY__
362KBUILD_AFLAGS_MODULE := -DMODULE
363KBUILD_CFLAGS_MODULE := -DMODULE
364KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
365
366# Read KERNELRELEASE from include/config/kernel.release (if it exists)
367KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
368KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
369
370export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
371export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
372export CPP AR NM STRIP OBJCOPY OBJDUMP
373export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
374export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
375
376export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
377export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
378export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
379export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
380export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
381
382# When compiling out-of-tree modules, put MODVERDIR in the module
383# tree rather than in the kernel tree. The kernel tree might
384# even be read-only.
385export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
386
387# Files to ignore in find ... statements
388
389RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
390export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
391
392# ===========================================================================
393# Rules shared between *config targets and build targets
394
395# Basic helpers built in scripts/
396PHONY += scripts_basic
397scripts_basic:
398    $(Q)$(MAKE) $(build)=scripts/basic
399    $(Q)rm -f .tmp_quiet_recordmcount
400
401# To avoid any implicit rule to kick in, define an empty command.
402scripts/basic/%: scripts_basic ;
403
404PHONY += outputmakefile
405# outputmakefile generates a Makefile in the output directory, if using a
406# separate output directory. This allows convenient use of make in the
407# output directory.
408outputmakefile:
409ifneq ($(KBUILD_SRC),)
410    $(Q)ln -fsn $(srctree) source
411    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
412        $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
413endif
414
415# To make sure we do not include .config for any of the *config targets
416# catch them early, and hand them over to scripts/kconfig/Makefile
417# It is allowed to specify more targets when calling make, including
418# mixing *config targets and build targets.
419# For example 'make oldconfig all'.
420# Detect when mixed targets is specified, and make a second invocation
421# of make so .config is not included in this case either (for *config).
422
423no-dot-config-targets := clean mrproper distclean \
424             cscope TAGS tags help %docs check% coccicheck \
425             include/linux/version.h headers_% \
426             kernelversion %src-pkg
427
428config-targets := 0
429mixed-targets := 0
430dot-config := 1
431
432ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
433    ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
434        dot-config := 0
435    endif
436endif
437
438ifeq ($(KBUILD_EXTMOD),)
439        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
440                config-targets := 1
441                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
442                        mixed-targets := 1
443                endif
444        endif
445endif
446
447ifeq ($(mixed-targets),1)
448# ===========================================================================
449# We're called with mixed targets (*config and build targets).
450# Handle them one by one.
451
452%:: FORCE
453    $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
454
455else
456ifeq ($(config-targets),1)
457# ===========================================================================
458# *config targets only - make sure prerequisites are updated, and descend
459# in scripts/kconfig to make the *config target
460
461# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
462# KBUILD_DEFCONFIG may point out an alternative default configuration
463# used for 'make defconfig'
464include $(srctree)/arch/$(SRCARCH)/Makefile
465export KBUILD_DEFCONFIG KBUILD_KCONFIG
466
467config: scripts_basic outputmakefile FORCE
468    $(Q)mkdir -p include/linux include/config
469    $(Q)$(MAKE) $(build)=scripts/kconfig $@
470
471%config: scripts_basic outputmakefile FORCE
472    $(Q)mkdir -p include/linux include/config
473    $(Q)$(MAKE) $(build)=scripts/kconfig $@
474
475else
476# ===========================================================================
477# Build targets only - this includes vmlinux, arch specific targets, clean
478# targets and others. In general all targets except *config targets.
479
480ifeq ($(KBUILD_EXTMOD),)
481# Additional helpers built in scripts/
482# Carefully list dependencies so we do not try to build scripts twice
483# in parallel
484PHONY += scripts
485scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
486    $(Q)$(MAKE) $(build)=$(@)
487
488# Objects we will link into vmlinux / subdirs we need to visit
489init-y := init/
490drivers-y := drivers/ sound/ firmware/
491net-y := net/
492libs-y := lib/
493core-y := usr/
494endif # KBUILD_EXTMOD
495
496ifeq ($(dot-config),1)
497# Read in config
498-include include/config/auto.conf
499
500ifeq ($(KBUILD_EXTMOD),)
501# Read in dependencies to all Kconfig* files, make sure to run
502# oldconfig if changes are detected.
503-include include/config/auto.conf.cmd
504
505# To avoid any implicit rule to kick in, define an empty command
506$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
507
508# If .config is newer than include/config/auto.conf, someone tinkered
509# with it and forgot to run make oldconfig.
510# if auto.conf.cmd is missing then we are probably in a cleaned tree so
511# we execute the config step to be sure to catch updated Kconfig files
512include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
513    $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
514else
515# external modules needs include/generated/autoconf.h and include/config/auto.conf
516# but do not care if they are up-to-date. Use auto.conf to trigger the test
517PHONY += include/config/auto.conf
518
519include/config/auto.conf:
520    $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
521    echo; \
522    echo " ERROR: Kernel configuration is invalid."; \
523    echo " include/generated/autoconf.h or $@ are missing.";\
524    echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
525    echo; \
526    /bin/false)
527
528endif # KBUILD_EXTMOD
529
530else
531# Dummy target needed, because used as prerequisite
532include/config/auto.conf: ;
533endif # $(dot-config)
534
535# The all: target is the default when no target is given on the
536# command line.
537# This allow a user to issue only 'make' to build a kernel including modules
538# Defaults to vmlinux, but the arch makefile usually adds further targets
539all: vmlinux
540
541ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
542KBUILD_CFLAGS += -Os
543else
544KBUILD_CFLAGS += -O2
545endif
546
547include $(srctree)/arch/$(SRCARCH)/Makefile
548
549ifneq ($(CONFIG_FRAME_WARN),0)
550KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
551endif
552
553# Force gcc to behave correct even for buggy distributions
554ifndef CONFIG_CC_STACKPROTECTOR
555KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
556endif
557
558ifdef CONFIG_FRAME_POINTER
559KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
560else
561# Some targets (ARM with Thumb2, for example), can't be built with frame
562# pointers. For those, we don't have FUNCTION_TRACER automatically
563# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
564# incompatible with -fomit-frame-pointer with current GCC, so we don't use
565# -fomit-frame-pointer with FUNCTION_TRACER.
566ifndef CONFIG_FUNCTION_TRACER
567KBUILD_CFLAGS += -fomit-frame-pointer
568endif
569endif
570
571ifdef CONFIG_DEBUG_INFO
572KBUILD_CFLAGS += -g
573KBUILD_AFLAGS += -gdwarf-2
574endif
575
576ifdef CONFIG_DEBUG_INFO_REDUCED
577KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly)
578endif
579
580ifdef CONFIG_FUNCTION_TRACER
581KBUILD_CFLAGS += -pg
582ifdef CONFIG_DYNAMIC_FTRACE
583    ifdef CONFIG_HAVE_C_RECORDMCOUNT
584        BUILD_C_RECORDMCOUNT := y
585        export BUILD_C_RECORDMCOUNT
586    endif
587endif
588endif
589
590# We trigger additional mismatches with less inlining
591ifdef CONFIG_DEBUG_SECTION_MISMATCH
592KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
593endif
594
595# arch Makefile may override CC so keep this after arch Makefile is included
596NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
597CHECKFLAGS += $(NOSTDINC_FLAGS)
598
599# warn about C99 declaration after statement
600KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
601
602# disable pointer signed / unsigned warnings in gcc 4.0
603KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
604
605# disable invalid "can't wrap" optimizations for signed / pointers
606KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
607
608# conserve stack if available
609KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
610
611# check for 'asm goto'
612ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
613    KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
614endif
615
616# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
617# But warn user when we do so
618warn-assign = \
619$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
620
621ifneq ($(KCPPFLAGS),)
622        $(call warn-assign,CPPFLAGS)
623        KBUILD_CPPFLAGS += $(KCPPFLAGS)
624endif
625ifneq ($(KAFLAGS),)
626        $(call warn-assign,AFLAGS)
627        KBUILD_AFLAGS += $(KAFLAGS)
628endif
629ifneq ($(KCFLAGS),)
630        $(call warn-assign,CFLAGS)
631        KBUILD_CFLAGS += $(KCFLAGS)
632endif
633
634# Use --build-id when available.
635LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
636                  $(call cc-ldoption, -Wl$(comma)--build-id,))
637KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
638LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
639
640ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
641LDFLAGS_vmlinux += $(call ld-option, -X,)
642endif
643
644# Default kernel image to build when no specific target is given.
645# KBUILD_IMAGE may be overruled on the command line or
646# set in the environment
647# Also any assignments in arch/$(ARCH)/Makefile take precedence over
648# this default value
649export KBUILD_IMAGE ?= vmlinux
650
651#
652# INSTALL_PATH specifies where to place the updated kernel and system map
653# images. Default is /boot, but you can set it to other values
654export INSTALL_PATH ?= /boot
655
656#
657# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
658# relocations required by build roots. This is not defined in the
659# makefile but the argument can be passed to make if needed.
660#
661
662MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
663export MODLIB
664
665#
666# INSTALL_MOD_STRIP, if defined, will cause modules to be
667# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
668# the default option --strip-debug will be used. Otherwise,
669# INSTALL_MOD_STRIP will used as the options to the strip command.
670
671ifdef INSTALL_MOD_STRIP
672ifeq ($(INSTALL_MOD_STRIP),1)
673mod_strip_cmd = $(STRIP) --strip-debug
674else
675mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
676endif # INSTALL_MOD_STRIP=1
677else
678mod_strip_cmd = true
679endif # INSTALL_MOD_STRIP
680export mod_strip_cmd
681
682
683ifeq ($(KBUILD_EXTMOD),)
684core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
685
686vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
687             $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
688             $(net-y) $(net-m) $(libs-y) $(libs-m)))
689
690vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
691             $(init-n) $(init-) \
692             $(core-n) $(core-) $(drivers-n) $(drivers-) \
693             $(net-n) $(net-) $(libs-n) $(libs-))))
694
695init-y := $(patsubst %/, %/built-in.o, $(init-y))
696core-y := $(patsubst %/, %/built-in.o, $(core-y))
697drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
698net-y := $(patsubst %/, %/built-in.o, $(net-y))
699libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
700libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
701libs-y := $(libs-y1) $(libs-y2)
702
703# Build vmlinux
704# ---------------------------------------------------------------------------
705# vmlinux is built from the objects selected by $(vmlinux-init) and
706# $(vmlinux-main). Most are built-in.o files from top-level directories
707# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
708# Ordering when linking is important, and $(vmlinux-init) must be first.
709#
710# vmlinux
711# ^
712# |
713# +-< $(vmlinux-init)
714# | +--< init/version.o + more
715# |
716# +--< $(vmlinux-main)
717# | +--< driver/built-in.o mm/built-in.o + more
718# |
719# +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
720#
721# vmlinux version (uname -v) cannot be updated during normal
722# descending-into-subdirs phase since we do not yet know if we need to
723# update vmlinux.
724# Therefore this step is delayed until just before final link of vmlinux -
725# except in the kallsyms case where it is done just before adding the
726# symbols to the kernel.
727#
728# System.map is generated to document addresses of all kernel symbols
729
730vmlinux-init := $(head-y) $(init-y)
731vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
732vmlinux-all := $(vmlinux-init) $(vmlinux-main)
733vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
734export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
735
736# Rule to link vmlinux - also used during CONFIG_KALLSYMS
737# May be overridden by arch/$(ARCH)/Makefile
738quiet_cmd_vmlinux__ ?= LD $@
739      cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
740      -T $(vmlinux-lds) $(vmlinux-init) \
741      --start-group $(vmlinux-main) --end-group \
742      $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
743
744# Generate new vmlinux version
745quiet_cmd_vmlinux_version = GEN .version
746      cmd_vmlinux_version = set -e; \
747    if [ ! -r .version ]; then \
748      rm -f .version; \
749      echo 1 >.version; \
750    else \
751      mv .version .old_version; \
752      expr 0$$(cat .old_version) + 1 >.version; \
753    fi; \
754    $(MAKE) $(build)=init
755
756# Generate System.map
757quiet_cmd_sysmap = SYSMAP
758      cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
759
760# Link of vmlinux
761# If CONFIG_KALLSYMS is set .version is already updated
762# Generate System.map and verify that the content is consistent
763# Use + in front of the vmlinux_version rule to silent warning with make -j2
764# First command is ':' to allow us to use + in front of the rule
765define rule_vmlinux__
766    :
767    $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
768
769    $(call cmd,vmlinux__)
770    $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
771
772    $(Q)$(if $($(quiet)cmd_sysmap), \
773      echo ' $($(quiet)cmd_sysmap) System.map' &&) \
774    $(cmd_sysmap) $@ System.map; \
775    if [ $$? -ne 0 ]; then \
776        rm -f $@; \
777        /bin/false; \
778    fi;
779    $(verify_kallsyms)
780endef
781
782
783ifdef CONFIG_KALLSYMS
784# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
785# It's a three stage process:
786# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
787# empty
788# Running kallsyms on that gives us .tmp_kallsyms1.o with
789# the right size - vmlinux version (uname -v) is updated during this step
790# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
791# but due to the added section, some addresses have shifted.
792# From here, we generate a correct .tmp_kallsyms2.o
793# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
794# o Verify that the System.map from vmlinux matches the map from
795# .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
796# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
797# .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
798# temporary bypass to allow the kernel to be built while the
799# maintainers work out what went wrong with kallsyms.
800
801ifdef CONFIG_KALLSYMS_EXTRA_PASS
802last_kallsyms := 3
803else
804last_kallsyms := 2
805endif
806
807kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
808
809define verify_kallsyms
810    $(Q)$(if $($(quiet)cmd_sysmap), \
811      echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
812      $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
813    $(Q)cmp -s System.map .tmp_System.map || \
814        (echo Inconsistent kallsyms data; \
815         echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
816         rm .tmp_kallsyms* ; /bin/false )
817endef
818
819# Update vmlinux version before link
820# Use + in front of this rule to silent warning about make -j1
821# First command is ':' to allow us to use + in front of this rule
822cmd_ksym_ld = $(cmd_vmlinux__)
823define rule_ksym_ld
824    :
825    +$(call cmd,vmlinux_version)
826    $(call cmd,vmlinux__)
827    $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
828endef
829
830# Generate .S file with all kernel symbols
831quiet_cmd_kallsyms = KSYM $@
832      cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
833                     $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
834
835.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
836    $(call if_changed_dep,as_o_S)
837
838.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
839    $(call cmd,kallsyms)
840
841# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
842.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
843    $(call if_changed_rule,ksym_ld)
844
845.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
846    $(call if_changed,vmlinux__)
847
848.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
849    $(call if_changed,vmlinux__)
850
851# Needs to visit scripts/ before $(KALLSYMS) can be used.
852$(KALLSYMS): scripts ;
853
854# Generate some data for debugging strange kallsyms problems
855debug_kallsyms: .tmp_map$(last_kallsyms)
856
857.tmp_map%: .tmp_vmlinux% FORCE
858    ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
859
860.tmp_map3: .tmp_map2
861
862.tmp_map2: .tmp_map1
863
864endif # ifdef CONFIG_KALLSYMS
865
866# Do modpost on a prelinked vmlinux. The finally linked vmlinux has
867# relevant sections renamed as per the linker script.
868quiet_cmd_vmlinux-modpost = LD $@
869      cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
870     $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
871     $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
872define rule_vmlinux-modpost
873    :
874    +$(call cmd,vmlinux-modpost)
875    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
876    $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
877endef
878
879# vmlinux image - including updated kernel symbols
880vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
881ifdef CONFIG_HEADERS_CHECK
882    $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
883endif
884ifdef CONFIG_SAMPLES
885    $(Q)$(MAKE) $(build)=samples
886endif
887ifdef CONFIG_BUILD_DOCSRC
888    $(Q)$(MAKE) $(build)=Documentation
889endif
890    $(call vmlinux-modpost)
891    $(call if_changed_rule,vmlinux__)
892    $(Q)rm -f .old_version
893
894# build vmlinux.o first to catch section mismatch errors early
895ifdef CONFIG_KALLSYMS
896.tmp_vmlinux1: vmlinux.o
897endif
898
899modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
900vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
901    $(call if_changed_rule,vmlinux-modpost)
902
903# The actual objects are generated when descending,
904# make sure no implicit rule kicks in
905$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
906
907# Handle descending into subdirectories listed in $(vmlinux-dirs)
908# Preset locale variables to speed up the build process. Limit locale
909# tweaks to this spot to avoid wrong language settings when running
910# make menuconfig etc.
911# Error messages still appears in the original language
912
913PHONY += $(vmlinux-dirs)
914$(vmlinux-dirs): prepare scripts
915    $(Q)$(MAKE) $(build)=$@
916
917# Store (new) KERNELRELASE string in include/config/kernel.release
918include/config/kernel.release: include/config/auto.conf FORCE
919    $(Q)rm -f $@
920    $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
921
922
923# Things we need to do before we recursively start building the kernel
924# or the modules are listed in "prepare".
925# A multi level approach is used. prepareN is processed before prepareN-1.
926# archprepare is used in arch Makefiles and when processed asm symlink,
927# version.h and scripts_basic is processed / created.
928
929# Listed in dependency order
930PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
931
932# prepare3 is used to check if we are building in a separate output directory,
933# and if so do:
934# 1) Check that make has not been executed in the kernel src $(srctree)
935prepare3: include/config/kernel.release
936ifneq ($(KBUILD_SRC),)
937    @$(kecho) ' Using $(srctree) as source for kernel'
938    $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
939        echo " $(srctree) is not clean, please run 'make mrproper'";\
940        echo " in the '$(srctree)' directory.";\
941        /bin/false; \
942    fi;
943endif
944
945# prepare2 creates a makefile if using a separate output directory
946prepare2: prepare3 outputmakefile
947
948prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
949                   include/config/auto.conf
950    $(cmd_crmodverdir)
951
952archprepare: prepare1 scripts_basic
953
954prepare0: archprepare FORCE
955    $(Q)$(MAKE) $(build)=.
956    $(Q)$(MAKE) $(build)=. missing-syscalls
957
958# All the preparing..
959prepare: prepare0
960
961# Generate some files
962# ---------------------------------------------------------------------------
963
964# KERNELRELEASE can change from a few different places, meaning version.h
965# needs to be updated, so this check is forced on all builds
966
967uts_len := 64
968define filechk_utsrelease.h
969    if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
970      echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
971      exit 1; \
972    fi; \
973    (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
974endef
975
976define filechk_version.h
977    (echo \#define LINUX_VERSION_CODE $(shell \
978    expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
979    echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
980endef
981
982include/linux/version.h: $(srctree)/Makefile FORCE
983    $(call filechk,version.h)
984
985include/generated/utsrelease.h: include/config/kernel.release FORCE
986    $(call filechk,utsrelease.h)
987
988PHONY += headerdep
989headerdep:
990    $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
991
992# ---------------------------------------------------------------------------
993
994PHONY += depend dep
995depend dep:
996    @echo '*** Warning: make $@ is unnecessary now.'
997
998# ---------------------------------------------------------------------------
999# Firmware install
1000INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1001export INSTALL_FW_PATH
1002
1003PHONY += firmware_install
1004firmware_install: FORCE
1005    @mkdir -p $(objtree)/firmware
1006    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1007
1008# ---------------------------------------------------------------------------
1009# Kernel headers
1010
1011#Default location for installed headers
1012export INSTALL_HDR_PATH = $(objtree)/usr
1013
1014hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1015
1016# If we do an all arch process set dst to asm-$(hdr-arch)
1017hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1018
1019PHONY += __headers
1020__headers: include/linux/version.h scripts_basic FORCE
1021    $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1022
1023PHONY += headers_install_all
1024headers_install_all:
1025    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1026
1027PHONY += headers_install
1028headers_install: __headers
1029    $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1030    $(error Headers not exportable for the $(SRCARCH) architecture))
1031    $(Q)$(MAKE) $(hdr-inst)=include
1032    $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1033
1034PHONY += headers_check_all
1035headers_check_all: headers_install_all
1036    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1037
1038PHONY += headers_check
1039headers_check: headers_install
1040    $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1041    $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1042
1043# ---------------------------------------------------------------------------
1044# Modules
1045
1046ifdef CONFIG_MODULES
1047
1048# By default, build modules as well
1049
1050all: modules
1051
1052# Build modules
1053#
1054# A module can be listed more than once in obj-m resulting in
1055# duplicate lines in modules.order files. Those are removed
1056# using awk while concatenating to the final file.
1057
1058PHONY += modules
1059modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1060    $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1061    @$(kecho) ' Building modules, stage 2.';
1062    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1063    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1064
1065modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1066    $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1067
1068%/modules.builtin: include/config/auto.conf
1069    $(Q)$(MAKE) $(modbuiltin)=$*
1070
1071
1072# Target to prepare building external modules
1073PHONY += modules_prepare
1074modules_prepare: prepare scripts
1075
1076# Target to install modules
1077PHONY += modules_install
1078modules_install: _modinst_ _modinst_post
1079
1080PHONY += _modinst_
1081_modinst_:
1082    @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1083        echo "Warning: you may need to install module-init-tools"; \
1084        echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1085        sleep 1; \
1086    fi
1087    @rm -rf $(MODLIB)/kernel
1088    @rm -f $(MODLIB)/source
1089    @mkdir -p $(MODLIB)/kernel
1090    @ln -s $(srctree) $(MODLIB)/source
1091    @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1092        rm -f $(MODLIB)/build ; \
1093        ln -s $(objtree) $(MODLIB)/build ; \
1094    fi
1095    @cp -f $(objtree)/modules.order $(MODLIB)/
1096    @cp -f $(objtree)/modules.builtin $(MODLIB)/
1097    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1098
1099# This depmod is only for convenience to give the initial
1100# boot a modules.dep even before / is mounted read-write. However the
1101# boot script depmod is the master version.
1102PHONY += _modinst_post
1103_modinst_post: _modinst_
1104    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1105    $(call cmd,depmod)
1106
1107else # CONFIG_MODULES
1108
1109# Modules not configured
1110# ---------------------------------------------------------------------------
1111
1112modules modules_install: FORCE
1113    @echo
1114    @echo "The present kernel configuration has modules disabled."
1115    @echo "Type 'make config' and enable loadable module support."
1116    @echo "Then build a kernel with module support enabled."
1117    @echo
1118    @exit 1
1119
1120endif # CONFIG_MODULES
1121
1122###
1123# Cleaning is done on three levels.
1124# make clean Delete most generated files
1125# Leave enough to build external modules
1126# make mrproper Delete the current configuration, and all generated files
1127# make distclean Remove editor backup files, patch leftover files and the like
1128
1129# Directories & files removed with 'make clean'
1130CLEAN_DIRS += $(MODVERDIR)
1131CLEAN_FILES += vmlinux System.map \
1132                .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1133
1134# Directories & files removed with 'make mrproper'
1135MRPROPER_DIRS += include/config usr/include include/generated
1136MRPROPER_FILES += .config .config.old .version .old_version \
1137                  include/linux/version.h \
1138          Module.symvers tags TAGS cscope*
1139
1140# clean - Delete most, but leave enough to build external modules
1141#
1142clean: rm-dirs := $(CLEAN_DIRS)
1143clean: rm-files := $(CLEAN_FILES)
1144clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation)
1145
1146PHONY += $(clean-dirs) clean archclean
1147$(clean-dirs):
1148    $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1149
1150clean: archclean
1151
1152# mrproper - Delete all generated files, including .config
1153#
1154mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1155mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1156mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1157
1158PHONY += $(mrproper-dirs) mrproper archmrproper
1159$(mrproper-dirs):
1160    $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1161
1162mrproper: clean archmrproper $(mrproper-dirs)
1163    $(call cmd,rmdirs)
1164    $(call cmd,rmfiles)
1165
1166# distclean
1167#
1168PHONY += distclean
1169
1170distclean: mrproper
1171    @find $(srctree) $(RCS_FIND_IGNORE) \
1172        \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1173        -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1174        -o -name '.*.rej' -o -size 0 \
1175        -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1176        -type f -print | xargs rm -f
1177
1178
1179# Packaging of the kernel to various formats
1180# ---------------------------------------------------------------------------
1181# rpm target kept for backward compatibility
1182package-dir := $(srctree)/scripts/package
1183
1184%src-pkg: FORCE
1185    $(Q)$(MAKE) $(build)=$(package-dir) $@
1186%pkg: include/config/kernel.release FORCE
1187    $(Q)$(MAKE) $(build)=$(package-dir) $@
1188rpm: include/config/kernel.release FORCE
1189    $(Q)$(MAKE) $(build)=$(package-dir) $@
1190
1191
1192# Brief documentation of the typical targets used
1193# ---------------------------------------------------------------------------
1194
1195boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1196boards := $(notdir $(boards))
1197board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1198board-dirs := $(sort $(notdir $(board-dirs:/=)))
1199
1200help:
1201    @echo 'Cleaning targets:'
1202    @echo ' clean - Remove most generated files but keep the config and'
1203    @echo ' enough build support to build external modules'
1204    @echo ' mrproper - Remove all generated files + config + various backup files'
1205    @echo ' distclean - mrproper + remove editor backup and patch files'
1206    @echo ''
1207    @echo 'Configuration targets:'
1208    @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1209    @echo ''
1210    @echo 'Other generic targets:'
1211    @echo ' all - Build all targets marked with [*]'
1212    @echo '* vmlinux - Build the bare kernel'
1213    @echo '* modules - Build all modules'
1214    @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1215    @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1216    @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1217    @echo ' dir/ - Build all files in dir and below'
1218    @echo ' dir/file.[oisS] - Build specified target only'
1219    @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1220    @echo ' (requires a recent binutils and recent build (System.map))'
1221    @echo ' dir/file.ko - Build module including final link'
1222    @echo ' modules_prepare - Set up for building external modules'
1223    @echo ' tags/TAGS - Generate tags file for editors'
1224    @echo ' cscope - Generate cscope index'
1225    @echo ' kernelrelease - Output the release version string'
1226    @echo ' kernelversion - Output the version stored in Makefile'
1227    @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1228     echo ' (default: $(INSTALL_HDR_PATH))'; \
1229     echo ''
1230    @echo 'Static analysers'
1231    @echo ' checkstack - Generate a list of stack hogs'
1232    @echo ' namespacecheck - Name space analysis on compiled kernel'
1233    @echo ' versioncheck - Sanity check on version.h usage'
1234    @echo ' includecheck - Check for duplicate included header files'
1235    @echo ' export_report - List the usages of all exported symbols'
1236    @echo ' headers_check - Sanity check on exported headers'
1237    @echo ' headerdep - Detect inclusion cycles in headers'
1238    @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1239    @echo ''
1240    @echo 'Kernel packaging:'
1241    @$(MAKE) $(build)=$(package-dir) help
1242    @echo ''
1243    @echo 'Documentation targets:'
1244    @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1245    @echo ''
1246    @echo 'Architecture specific targets ($(SRCARCH)):'
1247    @$(if $(archhelp),$(archhelp),\
1248        echo ' No architecture specific help defined for $(SRCARCH)')
1249    @echo ''
1250    @$(if $(boards), \
1251        $(foreach b, $(boards), \
1252        printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1253        echo '')
1254    @$(if $(board-dirs), \
1255        $(foreach b, $(board-dirs), \
1256        printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1257        printf " %-16s - Show all of the above\\n" help-boards; \
1258        echo '')
1259
1260    @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1261    @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1262    @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1263    @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1264    @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1265    @echo ''
1266    @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1267    @echo 'For further info see the ./README file'
1268
1269
1270help-board-dirs := $(addprefix help-,$(board-dirs))
1271
1272help-boards: $(help-board-dirs)
1273
1274boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1275
1276$(help-board-dirs): help-%:
1277    @echo 'Architecture specific targets ($(SRCARCH) $*):'
1278    @$(if $(boards-per-dir), \
1279        $(foreach b, $(boards-per-dir), \
1280        printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1281        echo '')
1282
1283
1284# Documentation targets
1285# ---------------------------------------------------------------------------
1286%docs: scripts_basic FORCE
1287    $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1288
1289else # KBUILD_EXTMOD
1290
1291###
1292# External module support.
1293# When building external modules the kernel used as basis is considered
1294# read-only, and no consistency checks are made and the make
1295# system is not used on the basis kernel. If updates are required
1296# in the basis kernel ordinary make commands (without M=...) must
1297# be used.
1298#
1299# The following are the only valid targets when building external
1300# modules.
1301# make M=dir clean Delete all automatically generated files
1302# make M=dir modules Make all modules in specified dir
1303# make M=dir Same as 'make M=dir modules'
1304# make M=dir modules_install
1305# Install the modules built in the module directory
1306# Assumes install directory is already created
1307
1308# We are always building modules
1309KBUILD_MODULES := 1
1310PHONY += crmodverdir
1311crmodverdir:
1312    $(cmd_crmodverdir)
1313
1314PHONY += $(objtree)/Module.symvers
1315$(objtree)/Module.symvers:
1316    @test -e $(objtree)/Module.symvers || ( \
1317    echo; \
1318    echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1319    echo " is missing; modules will have no dependencies and modversions."; \
1320    echo )
1321
1322module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1323PHONY += $(module-dirs) modules
1324$(module-dirs): crmodverdir $(objtree)/Module.symvers
1325    $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1326
1327modules: $(module-dirs)
1328    @$(kecho) ' Building modules, stage 2.';
1329    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1330
1331PHONY += modules_install
1332modules_install: _emodinst_ _emodinst_post
1333
1334install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1335PHONY += _emodinst_
1336_emodinst_:
1337    $(Q)mkdir -p $(MODLIB)/$(install-dir)
1338    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1339
1340PHONY += _emodinst_post
1341_emodinst_post: _emodinst_
1342    $(call cmd,depmod)
1343
1344clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1345
1346PHONY += $(clean-dirs) clean
1347$(clean-dirs):
1348    $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1349
1350clean: rm-dirs := $(MODVERDIR)
1351clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1352
1353help:
1354    @echo ' Building external modules.'
1355    @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1356    @echo ''
1357    @echo ' modules - default target, build the module(s)'
1358    @echo ' modules_install - install the module'
1359    @echo ' clean - remove generated files in module directory only'
1360    @echo ''
1361
1362# Dummies...
1363PHONY += prepare scripts
1364prepare: ;
1365scripts: ;
1366endif # KBUILD_EXTMOD
1367
1368clean: $(clean-dirs)
1369    $(call cmd,rmdirs)
1370    $(call cmd,rmfiles)
1371    @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1372        \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1373        -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1374        -o -name '*.symtypes' -o -name 'modules.order' \
1375        -o -name modules.builtin -o -name '.tmp_*.o.*' \
1376        -o -name '*.gcno' \) -type f -print | xargs rm -f
1377
1378# Generate tags for editors
1379# ---------------------------------------------------------------------------
1380quiet_cmd_tags = GEN $@
1381      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1382
1383tags TAGS cscope: FORCE
1384    $(call cmd,tags)
1385
1386# Scripts to check various things for consistency
1387# ---------------------------------------------------------------------------
1388
1389includecheck:
1390    find * $(RCS_FIND_IGNORE) \
1391        -name '*.[hcS]' -type f -print | sort \
1392        | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1393
1394versioncheck:
1395    find * $(RCS_FIND_IGNORE) \
1396        -name '*.[hcS]' -type f -print | sort \
1397        | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1398
1399coccicheck:
1400    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1401
1402namespacecheck:
1403    $(PERL) $(srctree)/scripts/namespace.pl
1404
1405export_report:
1406    $(PERL) $(srctree)/scripts/export_report.pl
1407
1408endif #ifeq ($(config-targets),1)
1409endif #ifeq ($(mixed-targets),1)
1410
1411PHONY += checkstack kernelrelease kernelversion
1412
1413# UML needs a little special treatment here. It wants to use the host
1414# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1415# else wants $(ARCH), including people doing cross-builds, which means
1416# that $(SUBARCH) doesn't work here.
1417ifeq ($(ARCH), um)
1418CHECKSTACK_ARCH := $(SUBARCH)
1419else
1420CHECKSTACK_ARCH := $(ARCH)
1421endif
1422checkstack:
1423    $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1424    $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1425
1426kernelrelease:
1427    @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1428
1429kernelversion:
1430    @echo $(KERNELVERSION)
1431
1432# Single targets
1433# ---------------------------------------------------------------------------
1434# Single targets are compatible with:
1435# - build with mixed source and output
1436# - build with separate output dir 'make O=...'
1437# - external modules
1438#
1439# target-dir => where to store outputfile
1440# build-dir => directory in kernel source tree to use
1441
1442ifeq ($(KBUILD_EXTMOD),)
1443        build-dir = $(patsubst %/,%,$(dir $@))
1444        target-dir = $(dir $@)
1445else
1446        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1447        build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1448        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1449endif
1450
1451%.s: %.c prepare scripts FORCE
1452    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1453%.i: %.c prepare scripts FORCE
1454    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1455%.o: %.c prepare scripts FORCE
1456    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1457%.lst: %.c prepare scripts FORCE
1458    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1459%.s: %.S prepare scripts FORCE
1460    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1461%.o: %.S prepare scripts FORCE
1462    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1463%.symtypes: %.c prepare scripts FORCE
1464    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1465
1466# Modules
1467/: prepare scripts FORCE
1468    $(cmd_crmodverdir)
1469    $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1470    $(build)=$(build-dir)
1471%/: prepare scripts FORCE
1472    $(cmd_crmodverdir)
1473    $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1474    $(build)=$(build-dir)
1475%.ko: prepare scripts FORCE
1476    $(cmd_crmodverdir)
1477    $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1478    $(build)=$(build-dir) $(@:.ko=.o)
1479    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1480
1481# FIXME Should go into a make.lib or something
1482# ===========================================================================
1483
1484quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1485      cmd_rmdirs = rm -rf $(rm-dirs)
1486
1487quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1488      cmd_rmfiles = rm -f $(rm-files)
1489
1490# Run depmod only if we have System.map and depmod is executable
1491quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1492      cmd_depmod = \
1493    if [ -r System.map -a -x $(DEPMOD) ]; then \
1494        $(DEPMOD) -ae -F System.map \
1495        $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) ) \
1496        $(KERNELRELEASE); \
1497    fi
1498
1499# Create temporary dir for module support files
1500# clean it up only when building all modules
1501cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1502                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1503
1504a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1505      $(KBUILD_AFLAGS_KERNEL) \
1506      $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1507      $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1508
1509quiet_cmd_as_o_S = AS $@
1510cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1511
1512# read all saved command lines
1513
1514targets := $(wildcard $(sort $(targets)))
1515cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1516
1517ifneq ($(cmd_files),)
1518  $(cmd_files): ; # Do not try to update included dependency files
1519  include $(cmd_files)
1520endif
1521
1522# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1523# Usage:
1524# $(Q)$(MAKE) $(clean)=dir
1525clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1526
1527endif # skip-makefile
1528
1529PHONY += FORCE
1530FORCE:
1531
1532# Declare the contents of the .PHONY variable as phony. We keep that
1533# information in a variable so we can use it in if_changed and friends.
1534.PHONY: $(PHONY)
1535

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