xref: /openbmc/linux/Makefile (revision c0c74acb)
1VERSION = 4
2PATCHLEVEL = 11
3SUBLEVEL = 0
4EXTRAVERSION =
5NAME = Fearless Coyote
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# o Do not use make's built-in rules and variables
14#   (this increases performance and avoids hard-to-debug behaviour);
15# o Look for make include files relative to root of kernel src
16MAKEFLAGS += -rR --include-dir=$(CURDIR)
17
18# Avoid funny character set dependencies
19unexport LC_ALL
20LC_COLLATE=C
21LC_NUMERIC=C
22export LC_COLLATE LC_NUMERIC
23
24# Avoid interference with shell env settings
25unexport GREP_OPTIONS
26
27# We are using a recursive build, so we need to do a little thinking
28# to get the ordering right.
29#
30# Most importantly: sub-Makefiles should only ever modify files in
31# their own directory. If in some directory we have a dependency on
32# a file in another dir (which doesn't happen often, but it's often
33# unavoidable when linking the built-in.o targets which finally
34# turn into vmlinux), we will call a sub make in that other dir, and
35# after that we are sure that everything which is in that other dir
36# is now up to date.
37#
38# The only cases where we need to modify files which have global
39# effects are thus separated out and done before the recursive
40# descending is started. They are now explicitly listed as the
41# prepare rule.
42
43# Beautify output
44# ---------------------------------------------------------------------------
45#
46# Normally, we echo the whole command before executing it. By making
47# that echo $($(quiet)$(cmd)), we now have the possibility to set
48# $(quiet) to choose other forms of output instead, e.g.
49#
50#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
51#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
52#
53# If $(quiet) is empty, the whole command will be printed.
54# If it is set to "quiet_", only the short version will be printed.
55# If it is set to "silent_", nothing will be printed at all, since
56# the variable $(silent_cmd_cc_o_c) doesn't exist.
57#
58# A simple variant is to prefix commands with $(Q) - that's useful
59# for commands that shall be hidden in non-verbose mode.
60#
61#	$(Q)ln $@ :<
62#
63# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
64# If KBUILD_VERBOSE equals 1 then the above command is displayed.
65#
66# To put more focus on warnings, be less verbose as default
67# Use 'make V=1' to see the full commands
68
69ifeq ("$(origin V)", "command line")
70  KBUILD_VERBOSE = $(V)
71endif
72ifndef KBUILD_VERBOSE
73  KBUILD_VERBOSE = 0
74endif
75
76ifeq ($(KBUILD_VERBOSE),1)
77  quiet =
78  Q =
79else
80  quiet=quiet_
81  Q = @
82endif
83
84# If the user is running make -s (silent mode), suppress echoing of
85# commands
86
87ifneq ($(filter 4.%,$(MAKE_VERSION)),)	# make-4
88ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
89  quiet=silent_
90  tools_silent=s
91endif
92else					# make-3.8x
93ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
94  quiet=silent_
95  tools_silent=-s
96endif
97endif
98
99export quiet Q KBUILD_VERBOSE
100
101# kbuild supports saving output files in a separate directory.
102# To locate output files in a separate directory two syntaxes are supported.
103# In both cases the working directory must be the root of the kernel src.
104# 1) O=
105# Use "make O=dir/to/store/output/files/"
106#
107# 2) Set KBUILD_OUTPUT
108# Set the environment variable KBUILD_OUTPUT to point to the directory
109# where the output files shall be placed.
110# export KBUILD_OUTPUT=dir/to/store/output/files/
111# make
112#
113# The O= assignment takes precedence over the KBUILD_OUTPUT environment
114# variable.
115
116# KBUILD_SRC is set on invocation of make in OBJ directory
117# KBUILD_SRC is not intended to be used by the regular user (for now)
118ifeq ($(KBUILD_SRC),)
119
120# OK, Make called in directory where kernel src resides
121# Do we want to locate output files in a separate directory?
122ifeq ("$(origin O)", "command line")
123  KBUILD_OUTPUT := $(O)
124endif
125
126# That's our default target when none is given on the command line
127PHONY := _all
128_all:
129
130# Cancel implicit rules on top Makefile
131$(CURDIR)/Makefile Makefile: ;
132
133ifneq ($(words $(subst :, ,$(CURDIR))), 1)
134  $(error main directory cannot contain spaces nor colons)
135endif
136
137ifneq ($(KBUILD_OUTPUT),)
138# Invoke a second make in the output directory, passing relevant variables
139# check that the output directory actually exists
140saved-output := $(KBUILD_OUTPUT)
141KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
142								&& /bin/pwd)
143$(if $(KBUILD_OUTPUT),, \
144     $(error failed to create output directory "$(saved-output)"))
145
146PHONY += $(MAKECMDGOALS) sub-make
147
148$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
149	@:
150
151sub-make:
152	$(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
153	-f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
154
155# Leave processing to above invocation of make
156skip-makefile := 1
157endif # ifneq ($(KBUILD_OUTPUT),)
158endif # ifeq ($(KBUILD_SRC),)
159
160# We process the rest of the Makefile if this is the final invocation of make
161ifeq ($(skip-makefile),)
162
163# Do not print "Entering directory ...",
164# but we want to display it when entering to the output directory
165# so that IDEs/editors are able to understand relative filenames.
166MAKEFLAGS += --no-print-directory
167
168# Call a source code checker (by default, "sparse") as part of the
169# C compilation.
170#
171# Use 'make C=1' to enable checking of only re-compiled files.
172# Use 'make C=2' to enable checking of *all* source files, regardless
173# of whether they are re-compiled or not.
174#
175# See the file "Documentation/sparse.txt" for more details, including
176# where to get the "sparse" utility.
177
178ifeq ("$(origin C)", "command line")
179  KBUILD_CHECKSRC = $(C)
180endif
181ifndef KBUILD_CHECKSRC
182  KBUILD_CHECKSRC = 0
183endif
184
185# Use make M=dir to specify directory of external module to build
186# Old syntax make ... SUBDIRS=$PWD is still supported
187# Setting the environment variable KBUILD_EXTMOD take precedence
188ifdef SUBDIRS
189  KBUILD_EXTMOD ?= $(SUBDIRS)
190endif
191
192ifeq ("$(origin M)", "command line")
193  KBUILD_EXTMOD := $(M)
194endif
195
196# If building an external module we do not care about the all: rule
197# but instead _all depend on modules
198PHONY += all
199ifeq ($(KBUILD_EXTMOD),)
200_all: all
201else
202_all: modules
203endif
204
205ifeq ($(KBUILD_SRC),)
206        # building in the source tree
207        srctree := .
208else
209        ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
210                # building in a subdirectory of the source tree
211                srctree := ..
212        else
213                srctree := $(KBUILD_SRC)
214        endif
215endif
216objtree		:= .
217src		:= $(srctree)
218obj		:= $(objtree)
219
220VPATH		:= $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
221
222export srctree objtree VPATH
223
224# SUBARCH tells the usermode build what the underlying arch is.  That is set
225# first, and if a usermode build is happening, the "ARCH=um" on the command
226# line overrides the setting of ARCH below.  If a native build is happening,
227# then ARCH is assigned, getting whatever value it gets normally, and
228# SUBARCH is subsequently ignored.
229
230SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
231				  -e s/sun4u/sparc64/ \
232				  -e s/arm.*/arm/ -e s/sa110/arm/ \
233				  -e s/s390x/s390/ -e s/parisc64/parisc/ \
234				  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
235				  -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
236
237# Cross compiling and selecting different set of gcc/bin-utils
238# ---------------------------------------------------------------------------
239#
240# When performing cross compilation for other architectures ARCH shall be set
241# to the target architecture. (See arch/* for the possibilities).
242# ARCH can be set during invocation of make:
243# make ARCH=ia64
244# Another way is to have ARCH set in the environment.
245# The default ARCH is the host where make is executed.
246
247# CROSS_COMPILE specify the prefix used for all executables used
248# during compilation. Only gcc and related bin-utils executables
249# are prefixed with $(CROSS_COMPILE).
250# CROSS_COMPILE can be set on the command line
251# make CROSS_COMPILE=ia64-linux-
252# Alternatively CROSS_COMPILE can be set in the environment.
253# A third alternative is to store a setting in .config so that plain
254# "make" in the configured kernel build directory always uses that.
255# Default value for CROSS_COMPILE is not to prefix executables
256# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
257ARCH		?= $(SUBARCH)
258CROSS_COMPILE	?= $(CONFIG_CROSS_COMPILE:"%"=%)
259
260# Architecture as present in compile.h
261UTS_MACHINE 	:= $(ARCH)
262SRCARCH 	:= $(ARCH)
263
264# Additional ARCH settings for x86
265ifeq ($(ARCH),i386)
266        SRCARCH := x86
267endif
268ifeq ($(ARCH),x86_64)
269        SRCARCH := x86
270endif
271
272# Additional ARCH settings for sparc
273ifeq ($(ARCH),sparc32)
274       SRCARCH := sparc
275endif
276ifeq ($(ARCH),sparc64)
277       SRCARCH := sparc
278endif
279
280# Additional ARCH settings for sh
281ifeq ($(ARCH),sh64)
282       SRCARCH := sh
283endif
284
285# Additional ARCH settings for tile
286ifeq ($(ARCH),tilepro)
287       SRCARCH := tile
288endif
289ifeq ($(ARCH),tilegx)
290       SRCARCH := tile
291endif
292
293# Where to locate arch specific headers
294hdr-arch  := $(SRCARCH)
295
296KCONFIG_CONFIG	?= .config
297export KCONFIG_CONFIG
298
299# SHELL used by kbuild
300CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
301	  else if [ -x /bin/bash ]; then echo /bin/bash; \
302	  else echo sh; fi ; fi)
303
304HOSTCC       = gcc
305HOSTCXX      = g++
306HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
307HOSTCXXFLAGS = -O2
308
309ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
310HOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
311		-Wno-missing-field-initializers -fno-delete-null-pointer-checks
312endif
313
314# Decide whether to build built-in, modular, or both.
315# Normally, just do built-in.
316
317KBUILD_MODULES :=
318KBUILD_BUILTIN := 1
319
320# If we have only "make modules", don't compile built-in objects.
321# When we're building modules with modversions, we need to consider
322# the built-in objects during the descend as well, in order to
323# make sure the checksums are up to date before we record them.
324
325ifeq ($(MAKECMDGOALS),modules)
326  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
327endif
328
329# If we have "make <whatever> modules", compile modules
330# in addition to whatever we do anyway.
331# Just "make" or "make all" shall build modules as well
332
333ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
334  KBUILD_MODULES := 1
335endif
336
337ifeq ($(MAKECMDGOALS),)
338  KBUILD_MODULES := 1
339endif
340
341export KBUILD_MODULES KBUILD_BUILTIN
342export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
343
344# We need some generic definitions (do not try to remake the file).
345scripts/Kbuild.include: ;
346include scripts/Kbuild.include
347
348# Make variables (CC, etc...)
349AS		= $(CROSS_COMPILE)as
350LD		= $(CROSS_COMPILE)ld
351CC		= $(CROSS_COMPILE)gcc
352CPP		= $(CC) -E
353AR		= $(CROSS_COMPILE)ar
354NM		= $(CROSS_COMPILE)nm
355STRIP		= $(CROSS_COMPILE)strip
356OBJCOPY		= $(CROSS_COMPILE)objcopy
357OBJDUMP		= $(CROSS_COMPILE)objdump
358AWK		= awk
359GENKSYMS	= scripts/genksyms/genksyms
360INSTALLKERNEL  := installkernel
361DEPMOD		= /sbin/depmod
362PERL		= perl
363PYTHON		= python
364CHECK		= sparse
365
366CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
367		  -Wbitwise -Wno-return-void $(CF)
368NOSTDINC_FLAGS  =
369CFLAGS_MODULE   =
370AFLAGS_MODULE   =
371LDFLAGS_MODULE  =
372CFLAGS_KERNEL	=
373AFLAGS_KERNEL	=
374LDFLAGS_vmlinux =
375CFLAGS_GCOV	:= -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
376CFLAGS_KCOV	:= $(call cc-option,-fsanitize-coverage=trace-pc,)
377
378
379# Use USERINCLUDE when you must reference the UAPI directories only.
380USERINCLUDE    := \
381		-I$(srctree)/arch/$(hdr-arch)/include/uapi \
382		-I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
383		-I$(srctree)/include/uapi \
384		-I$(objtree)/include/generated/uapi \
385                -include $(srctree)/include/linux/kconfig.h
386
387# Use LINUXINCLUDE when you must reference the include/ directory.
388# Needed to be compatible with the O= option
389LINUXINCLUDE    := \
390		-I$(srctree)/arch/$(hdr-arch)/include \
391		-I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
392		-I$(objtree)/arch/$(hdr-arch)/include/generated \
393		$(if $(KBUILD_SRC), -I$(srctree)/include) \
394		-I$(objtree)/include
395
396LINUXINCLUDE	+= $(filter-out $(LINUXINCLUDE),$(USERINCLUDE))
397
398KBUILD_CPPFLAGS := -D__KERNEL__
399
400KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
401		   -fno-strict-aliasing -fno-common \
402		   -Werror-implicit-function-declaration \
403		   -Wno-format-security \
404		   -std=gnu89 $(call cc-option,-fno-PIE)
405
406
407KBUILD_AFLAGS_KERNEL :=
408KBUILD_CFLAGS_KERNEL :=
409KBUILD_AFLAGS   := -D__ASSEMBLY__ $(call cc-option,-fno-PIE)
410KBUILD_AFLAGS_MODULE  := -DMODULE
411KBUILD_CFLAGS_MODULE  := -DMODULE
412KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
413
414# Read KERNELRELEASE from include/config/kernel.release (if it exists)
415KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
416KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
417
418export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
419export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
420export CPP AR NM STRIP OBJCOPY OBJDUMP
421export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
422export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
423
424export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
425export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
426export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
427export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
428export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
429export KBUILD_ARFLAGS
430
431# When compiling out-of-tree modules, put MODVERDIR in the module
432# tree rather than in the kernel tree. The kernel tree might
433# even be read-only.
434export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
435
436# Files to ignore in find ... statements
437
438export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
439			  -name CVS -o -name .pc -o -name .hg -o -name .git \) \
440			  -prune -o
441export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
442			 --exclude CVS --exclude .pc --exclude .hg --exclude .git
443
444# ===========================================================================
445# Rules shared between *config targets and build targets
446
447# Basic helpers built in scripts/
448PHONY += scripts_basic
449scripts_basic:
450	$(Q)$(MAKE) $(build)=scripts/basic
451	$(Q)rm -f .tmp_quiet_recordmcount
452
453# To avoid any implicit rule to kick in, define an empty command.
454scripts/basic/%: scripts_basic ;
455
456PHONY += outputmakefile
457# outputmakefile generates a Makefile in the output directory, if using a
458# separate output directory. This allows convenient use of make in the
459# output directory.
460outputmakefile:
461ifneq ($(KBUILD_SRC),)
462	$(Q)ln -fsn $(srctree) source
463	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
464	    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
465endif
466
467# Support for using generic headers in asm-generic
468PHONY += asm-generic
469asm-generic:
470	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
471	            src=asm obj=arch/$(SRCARCH)/include/generated/asm
472	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
473	            src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
474
475# To make sure we do not include .config for any of the *config targets
476# catch them early, and hand them over to scripts/kconfig/Makefile
477# It is allowed to specify more targets when calling make, including
478# mixing *config targets and build targets.
479# For example 'make oldconfig all'.
480# Detect when mixed targets is specified, and make a second invocation
481# of make so .config is not included in this case either (for *config).
482
483version_h := include/generated/uapi/linux/version.h
484old_version_h := include/linux/version.h
485
486no-dot-config-targets := clean mrproper distclean \
487			 cscope gtags TAGS tags help% %docs check% coccicheck \
488			 $(version_h) headers_% archheaders archscripts \
489			 kernelversion %src-pkg
490
491config-targets := 0
492mixed-targets  := 0
493dot-config     := 1
494
495ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
496	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
497		dot-config := 0
498	endif
499endif
500
501ifeq ($(KBUILD_EXTMOD),)
502        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
503                config-targets := 1
504                ifneq ($(words $(MAKECMDGOALS)),1)
505                        mixed-targets := 1
506                endif
507        endif
508endif
509# install and module_install need also be processed one by one
510ifneq ($(filter install,$(MAKECMDGOALS)),)
511        ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
512	        mixed-targets := 1
513        endif
514endif
515
516ifeq ($(mixed-targets),1)
517# ===========================================================================
518# We're called with mixed targets (*config and build targets).
519# Handle them one by one.
520
521PHONY += $(MAKECMDGOALS) __build_one_by_one
522
523$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
524	@:
525
526__build_one_by_one:
527	$(Q)set -e; \
528	for i in $(MAKECMDGOALS); do \
529		$(MAKE) -f $(srctree)/Makefile $$i; \
530	done
531
532else
533ifeq ($(config-targets),1)
534# ===========================================================================
535# *config targets only - make sure prerequisites are updated, and descend
536# in scripts/kconfig to make the *config target
537
538# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
539# KBUILD_DEFCONFIG may point out an alternative default configuration
540# used for 'make defconfig'
541include arch/$(SRCARCH)/Makefile
542export KBUILD_DEFCONFIG KBUILD_KCONFIG
543
544config: scripts_basic outputmakefile FORCE
545	$(Q)$(MAKE) $(build)=scripts/kconfig $@
546
547%config: scripts_basic outputmakefile FORCE
548	$(Q)$(MAKE) $(build)=scripts/kconfig $@
549
550else
551# ===========================================================================
552# Build targets only - this includes vmlinux, arch specific targets, clean
553# targets and others. In general all targets except *config targets.
554
555ifeq ($(KBUILD_EXTMOD),)
556# Additional helpers built in scripts/
557# Carefully list dependencies so we do not try to build scripts twice
558# in parallel
559PHONY += scripts
560scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
561	 asm-generic gcc-plugins
562	$(Q)$(MAKE) $(build)=$(@)
563
564# Objects we will link into vmlinux / subdirs we need to visit
565init-y		:= init/
566drivers-y	:= drivers/ sound/ firmware/
567net-y		:= net/
568libs-y		:= lib/
569core-y		:= usr/
570virt-y		:= virt/
571endif # KBUILD_EXTMOD
572
573ifeq ($(dot-config),1)
574# Read in config
575-include include/config/auto.conf
576
577ifeq ($(KBUILD_EXTMOD),)
578# Read in dependencies to all Kconfig* files, make sure to run
579# oldconfig if changes are detected.
580-include include/config/auto.conf.cmd
581
582# To avoid any implicit rule to kick in, define an empty command
583$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
584
585# If .config is newer than include/config/auto.conf, someone tinkered
586# with it and forgot to run make oldconfig.
587# if auto.conf.cmd is missing then we are probably in a cleaned tree so
588# we execute the config step to be sure to catch updated Kconfig files
589include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
590	$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
591else
592# external modules needs include/generated/autoconf.h and include/config/auto.conf
593# but do not care if they are up-to-date. Use auto.conf to trigger the test
594PHONY += include/config/auto.conf
595
596include/config/auto.conf:
597	$(Q)test -e include/generated/autoconf.h -a -e $@ || (		\
598	echo >&2;							\
599	echo >&2 "  ERROR: Kernel configuration is invalid.";		\
600	echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
601	echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";	\
602	echo >&2 ;							\
603	/bin/false)
604
605endif # KBUILD_EXTMOD
606
607else
608# Dummy target needed, because used as prerequisite
609include/config/auto.conf: ;
610endif # $(dot-config)
611
612# For the kernel to actually contain only the needed exported symbols,
613# we have to build modules as well to determine what those symbols are.
614# (this can be evaluated only once include/config/auto.conf has been included)
615ifdef CONFIG_TRIM_UNUSED_KSYMS
616  KBUILD_MODULES := 1
617endif
618
619# The all: target is the default when no target is given on the
620# command line.
621# This allow a user to issue only 'make' to build a kernel including modules
622# Defaults to vmlinux, but the arch makefile usually adds further targets
623all: vmlinux
624
625# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
626# values of the respective KBUILD_* variables
627ARCH_CPPFLAGS :=
628ARCH_AFLAGS :=
629ARCH_CFLAGS :=
630include arch/$(SRCARCH)/Makefile
631
632KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
633KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
634
635ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
636KBUILD_CFLAGS	+= $(call cc-option,-ffunction-sections,)
637KBUILD_CFLAGS	+= $(call cc-option,-fdata-sections,)
638endif
639
640ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
641KBUILD_CFLAGS	+= -Os $(call cc-disable-warning,maybe-uninitialized,)
642else
643ifdef CONFIG_PROFILE_ALL_BRANCHES
644KBUILD_CFLAGS	+= -O2 $(call cc-disable-warning,maybe-uninitialized,)
645else
646KBUILD_CFLAGS   += -O2
647endif
648endif
649
650KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
651			$(call cc-disable-warning,maybe-uninitialized,))
652
653# Tell gcc to never replace conditional load with a non-conditional one
654KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)
655
656# check for 'asm goto'
657ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
658	KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
659	KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
660endif
661
662include scripts/Makefile.gcc-plugins
663
664ifdef CONFIG_READABLE_ASM
665# Disable optimizations that make assembler listings hard to read.
666# reorder blocks reorders the control in the function
667# ipa clone creates specialized cloned functions
668# partial inlining inlines only parts of functions
669KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
670                 $(call cc-option,-fno-ipa-cp-clone,) \
671                 $(call cc-option,-fno-partial-inlining)
672endif
673
674ifneq ($(CONFIG_FRAME_WARN),0)
675KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
676endif
677
678# This selects the stack protector compiler flag. Testing it is delayed
679# until after .config has been reprocessed, in the prepare-compiler-check
680# target.
681ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
682  stackp-flag := -fstack-protector
683  stackp-name := REGULAR
684else
685ifdef CONFIG_CC_STACKPROTECTOR_STRONG
686  stackp-flag := -fstack-protector-strong
687  stackp-name := STRONG
688else
689  # Force off for distro compilers that enable stack protector by default.
690  stackp-flag := $(call cc-option, -fno-stack-protector)
691endif
692endif
693# Find arch-specific stack protector compiler sanity-checking script.
694ifdef CONFIG_CC_STACKPROTECTOR
695  stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
696  stackp-check := $(wildcard $(stackp-path))
697endif
698KBUILD_CFLAGS += $(stackp-flag)
699
700ifeq ($(cc-name),clang)
701KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
702KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
703KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
704KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
705KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
706# Quiet clang warning: comparison of unsigned expression < 0 is always false
707KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
708# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
709# source of a reference will be _MergedGlobals and not on of the whitelisted names.
710# See modpost pattern 2
711KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
712KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
713else
714
715# These warnings generated too much noise in a regular build.
716# Use make W=1 to enable them (see scripts/Makefile.build)
717KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
718KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
719endif
720
721ifdef CONFIG_FRAME_POINTER
722KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
723else
724# Some targets (ARM with Thumb2, for example), can't be built with frame
725# pointers.  For those, we don't have FUNCTION_TRACER automatically
726# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
727# incompatible with -fomit-frame-pointer with current GCC, so we don't use
728# -fomit-frame-pointer with FUNCTION_TRACER.
729ifndef CONFIG_FUNCTION_TRACER
730KBUILD_CFLAGS	+= -fomit-frame-pointer
731endif
732endif
733
734KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
735
736ifdef CONFIG_DEBUG_INFO
737ifdef CONFIG_DEBUG_INFO_SPLIT
738KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
739else
740KBUILD_CFLAGS	+= -g
741endif
742KBUILD_AFLAGS	+= -Wa,-gdwarf-2
743endif
744ifdef CONFIG_DEBUG_INFO_DWARF4
745KBUILD_CFLAGS	+= $(call cc-option, -gdwarf-4,)
746endif
747
748ifdef CONFIG_DEBUG_INFO_REDUCED
749KBUILD_CFLAGS 	+= $(call cc-option, -femit-struct-debug-baseonly) \
750		   $(call cc-option,-fno-var-tracking)
751endif
752
753ifdef CONFIG_FUNCTION_TRACER
754ifndef CC_FLAGS_FTRACE
755CC_FLAGS_FTRACE := -pg
756endif
757export CC_FLAGS_FTRACE
758ifdef CONFIG_HAVE_FENTRY
759CC_USING_FENTRY	:= $(call cc-option, -mfentry -DCC_USING_FENTRY)
760endif
761KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
762KBUILD_AFLAGS	+= $(CC_USING_FENTRY)
763ifdef CONFIG_DYNAMIC_FTRACE
764	ifdef CONFIG_HAVE_C_RECORDMCOUNT
765		BUILD_C_RECORDMCOUNT := y
766		export BUILD_C_RECORDMCOUNT
767	endif
768endif
769endif
770
771# We trigger additional mismatches with less inlining
772ifdef CONFIG_DEBUG_SECTION_MISMATCH
773KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
774endif
775
776# arch Makefile may override CC so keep this after arch Makefile is included
777NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
778CHECKFLAGS     += $(NOSTDINC_FLAGS)
779
780# warn about C99 declaration after statement
781KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
782
783# disable pointer signed / unsigned warnings in gcc 4.0
784KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
785
786# disable invalid "can't wrap" optimizations for signed / pointers
787KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
788
789# conserve stack if available
790KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
791
792# disallow errors like 'EXPORT_GPL(foo);' with missing header
793KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
794
795# require functions to have arguments in prototypes, not empty 'int foo()'
796KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
797
798# Prohibit date/time macros, which would make the build non-deterministic
799KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
800
801# enforce correct pointer usage
802KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
803
804# use the deterministic mode of AR if available
805KBUILD_ARFLAGS := $(call ar-option,D)
806
807include scripts/Makefile.kasan
808include scripts/Makefile.extrawarn
809include scripts/Makefile.ubsan
810
811# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
812# last assignments
813KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
814KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
815KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
816
817# Use --build-id when available.
818LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
819			      $(call cc-ldoption, -Wl$(comma)--build-id,))
820KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
821LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
822
823ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
824LDFLAGS_vmlinux	+= $(call ld-option, --gc-sections,)
825endif
826
827ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
828LDFLAGS_vmlinux	+= $(call ld-option, -X,)
829endif
830
831# Default kernel image to build when no specific target is given.
832# KBUILD_IMAGE may be overruled on the command line or
833# set in the environment
834# Also any assignments in arch/$(ARCH)/Makefile take precedence over
835# this default value
836export KBUILD_IMAGE ?= vmlinux
837
838#
839# INSTALL_PATH specifies where to place the updated kernel and system map
840# images. Default is /boot, but you can set it to other values
841export	INSTALL_PATH ?= /boot
842
843#
844# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
845# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
846# an argument if needed. Otherwise it defaults to the kernel install path
847#
848export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
849
850#
851# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
852# relocations required by build roots.  This is not defined in the
853# makefile but the argument can be passed to make if needed.
854#
855
856MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
857export MODLIB
858
859#
860# INSTALL_MOD_STRIP, if defined, will cause modules to be
861# stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
862# the default option --strip-debug will be used.  Otherwise,
863# INSTALL_MOD_STRIP value will be used as the options to the strip command.
864
865ifdef INSTALL_MOD_STRIP
866ifeq ($(INSTALL_MOD_STRIP),1)
867mod_strip_cmd = $(STRIP) --strip-debug
868else
869mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
870endif # INSTALL_MOD_STRIP=1
871else
872mod_strip_cmd = true
873endif # INSTALL_MOD_STRIP
874export mod_strip_cmd
875
876# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
877# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
878# or CONFIG_MODULE_COMPRESS_XZ.
879
880mod_compress_cmd = true
881ifdef CONFIG_MODULE_COMPRESS
882  ifdef CONFIG_MODULE_COMPRESS_GZIP
883    mod_compress_cmd = gzip -n -f
884  endif # CONFIG_MODULE_COMPRESS_GZIP
885  ifdef CONFIG_MODULE_COMPRESS_XZ
886    mod_compress_cmd = xz -f
887  endif # CONFIG_MODULE_COMPRESS_XZ
888endif # CONFIG_MODULE_COMPRESS
889export mod_compress_cmd
890
891# Select initial ramdisk compression format, default is gzip(1).
892# This shall be used by the dracut(8) tool while creating an initramfs image.
893#
894INITRD_COMPRESS-y                  := gzip
895INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
896INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
897INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
898INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
899INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
900# do not export INITRD_COMPRESS, since we didn't actually
901# choose a sane default compression above.
902# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
903
904ifdef CONFIG_MODULE_SIG_ALL
905$(eval $(call config_filename,MODULE_SIG_KEY))
906
907mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
908else
909mod_sign_cmd = true
910endif
911export mod_sign_cmd
912
913ifdef CONFIG_STACK_VALIDATION
914  has_libelf := $(call try-run,\
915		echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
916  ifeq ($(has_libelf),1)
917    objtool_target := tools/objtool FORCE
918  else
919    $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
920    SKIP_STACK_VALIDATION := 1
921    export SKIP_STACK_VALIDATION
922  endif
923endif
924
925
926ifeq ($(KBUILD_EXTMOD),)
927core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
928
929vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
930		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
931		     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
932
933vmlinux-alldirs	:= $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
934		     $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
935
936init-y		:= $(patsubst %/, %/built-in.o, $(init-y))
937core-y		:= $(patsubst %/, %/built-in.o, $(core-y))
938drivers-y	:= $(patsubst %/, %/built-in.o, $(drivers-y))
939net-y		:= $(patsubst %/, %/built-in.o, $(net-y))
940libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
941libs-y2		:= $(patsubst %/, %/built-in.o, $(libs-y))
942libs-y		:= $(libs-y1) $(libs-y2)
943virt-y		:= $(patsubst %/, %/built-in.o, $(virt-y))
944
945# Externally visible symbols (used by link-vmlinux.sh)
946export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
947export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
948export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
949export LDFLAGS_vmlinux
950# used by scripts/pacmage/Makefile
951export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
952
953vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
954
955# Include targets which we want to execute sequentially if the rest of the
956# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
957# evaluated more than once.
958PHONY += vmlinux_prereq
959vmlinux_prereq: $(vmlinux-deps) FORCE
960ifdef CONFIG_HEADERS_CHECK
961	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
962endif
963ifdef CONFIG_GDB_SCRIPTS
964	$(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
965endif
966ifdef CONFIG_TRIM_UNUSED_KSYMS
967	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
968	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
969endif
970
971# standalone target for easier testing
972include/generated/autoksyms.h: FORCE
973	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
974
975ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
976
977# Final link of vmlinux with optional arch pass after final link
978    cmd_link-vmlinux =                                                 \
979	$(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;       \
980	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
981
982vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
983	+$(call if_changed,link-vmlinux)
984
985# Build samples along the rest of the kernel
986ifdef CONFIG_SAMPLES
987vmlinux-dirs += samples
988endif
989
990# The actual objects are generated when descending,
991# make sure no implicit rule kicks in
992$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
993
994# Handle descending into subdirectories listed in $(vmlinux-dirs)
995# Preset locale variables to speed up the build process. Limit locale
996# tweaks to this spot to avoid wrong language settings when running
997# make menuconfig etc.
998# Error messages still appears in the original language
999
1000PHONY += $(vmlinux-dirs)
1001$(vmlinux-dirs): prepare scripts
1002	$(Q)$(MAKE) $(build)=$@
1003
1004define filechk_kernel.release
1005	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1006endef
1007
1008# Store (new) KERNELRELEASE string in include/config/kernel.release
1009include/config/kernel.release: include/config/auto.conf FORCE
1010	$(call filechk,kernel.release)
1011
1012
1013# Things we need to do before we recursively start building the kernel
1014# or the modules are listed in "prepare".
1015# A multi level approach is used. prepareN is processed before prepareN-1.
1016# archprepare is used in arch Makefiles and when processed asm symlink,
1017# version.h and scripts_basic is processed / created.
1018
1019# Listed in dependency order
1020PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1021
1022# prepare3 is used to check if we are building in a separate output directory,
1023# and if so do:
1024# 1) Check that make has not been executed in the kernel src $(srctree)
1025prepare3: include/config/kernel.release
1026ifneq ($(KBUILD_SRC),)
1027	@$(kecho) '  Using $(srctree) as source for kernel'
1028	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1029		echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1030		echo >&2 "  in the '$(srctree)' directory.";\
1031		/bin/false; \
1032	fi;
1033endif
1034
1035# prepare2 creates a makefile if using a separate output directory.
1036# From this point forward, .config has been reprocessed, so any rules
1037# that need to depend on updated CONFIG_* values can be checked here.
1038prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1039
1040prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1041                   include/config/auto.conf
1042	$(cmd_crmodverdir)
1043
1044archprepare: archheaders archscripts prepare1 scripts_basic
1045
1046prepare0: archprepare gcc-plugins
1047	$(Q)$(MAKE) $(build)=.
1048
1049# All the preparing..
1050prepare: prepare0 prepare-objtool
1051
1052PHONY += prepare-objtool
1053prepare-objtool: $(objtool_target)
1054
1055# Check for CONFIG flags that require compiler support. Abort the build
1056# after .config has been processed, but before the kernel build starts.
1057#
1058# For security-sensitive CONFIG options, we don't want to fallback and/or
1059# silently change which compiler flags will be used, since that leads to
1060# producing kernels with different security feature characteristics
1061# depending on the compiler used. (For example, "But I selected
1062# CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1063PHONY += prepare-compiler-check
1064prepare-compiler-check: FORCE
1065# Make sure compiler supports requested stack protector flag.
1066ifdef stackp-name
1067  ifeq ($(call cc-option, $(stackp-flag)),)
1068	@echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1069		  $(stackp-flag) not supported by compiler >&2 && exit 1
1070  endif
1071endif
1072# Make sure compiler does not have buggy stack-protector support.
1073ifdef stackp-check
1074  ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1075	@echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1076                  $(stackp-flag) available but compiler is broken >&2 && exit 1
1077  endif
1078endif
1079	@:
1080
1081# Generate some files
1082# ---------------------------------------------------------------------------
1083
1084# KERNELRELEASE can change from a few different places, meaning version.h
1085# needs to be updated, so this check is forced on all builds
1086
1087uts_len := 64
1088define filechk_utsrelease.h
1089	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1090	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1091	  exit 1;                                                         \
1092	fi;                                                               \
1093	(echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1094endef
1095
1096define filechk_version.h
1097	(echo \#define LINUX_VERSION_CODE $(shell                         \
1098	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1099	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1100endef
1101
1102$(version_h): $(srctree)/Makefile FORCE
1103	$(call filechk,version.h)
1104	$(Q)rm -f $(old_version_h)
1105
1106include/generated/utsrelease.h: include/config/kernel.release FORCE
1107	$(call filechk,utsrelease.h)
1108
1109PHONY += headerdep
1110headerdep:
1111	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1112	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1113
1114# ---------------------------------------------------------------------------
1115# Firmware install
1116INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1117export INSTALL_FW_PATH
1118
1119PHONY += firmware_install
1120firmware_install:
1121	@mkdir -p $(objtree)/firmware
1122	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1123
1124# ---------------------------------------------------------------------------
1125# Kernel headers
1126
1127#Default location for installed headers
1128export INSTALL_HDR_PATH = $(objtree)/usr
1129
1130# If we do an all arch process set dst to asm-$(hdr-arch)
1131hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1132
1133PHONY += archheaders
1134archheaders:
1135
1136PHONY += archscripts
1137archscripts:
1138
1139PHONY += __headers
1140__headers: $(version_h) scripts_basic asm-generic archheaders archscripts
1141	$(Q)$(MAKE) $(build)=scripts build_unifdef
1142
1143PHONY += headers_install_all
1144headers_install_all:
1145	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1146
1147PHONY += headers_install
1148headers_install: __headers
1149	$(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1150	  $(error Headers not exportable for the $(SRCARCH) architecture))
1151	$(Q)$(MAKE) $(hdr-inst)=include/uapi
1152	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1153
1154PHONY += headers_check_all
1155headers_check_all: headers_install_all
1156	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1157
1158PHONY += headers_check
1159headers_check: headers_install
1160	$(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1161	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1162
1163# ---------------------------------------------------------------------------
1164# Kernel selftest
1165
1166PHONY += kselftest
1167kselftest:
1168	$(Q)$(MAKE) -C tools/testing/selftests run_tests
1169
1170kselftest-clean:
1171	$(Q)$(MAKE) -C tools/testing/selftests clean
1172
1173PHONY += kselftest-merge
1174kselftest-merge:
1175	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1176	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1177		-m $(objtree)/.config \
1178		$(srctree)/tools/testing/selftests/*/config
1179	+$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1180
1181# ---------------------------------------------------------------------------
1182# Modules
1183
1184ifdef CONFIG_MODULES
1185
1186# By default, build modules as well
1187
1188all: modules
1189
1190# Build modules
1191#
1192# A module can be listed more than once in obj-m resulting in
1193# duplicate lines in modules.order files.  Those are removed
1194# using awk while concatenating to the final file.
1195
1196PHONY += modules
1197modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1198	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1199	@$(kecho) '  Building modules, stage 2.';
1200	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1201	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1202
1203modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1204	$(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1205
1206%/modules.builtin: include/config/auto.conf
1207	$(Q)$(MAKE) $(modbuiltin)=$*
1208
1209
1210# Target to prepare building external modules
1211PHONY += modules_prepare
1212modules_prepare: prepare scripts
1213
1214# Target to install modules
1215PHONY += modules_install
1216modules_install: _modinst_ _modinst_post
1217
1218PHONY += _modinst_
1219_modinst_:
1220	@rm -rf $(MODLIB)/kernel
1221	@rm -f $(MODLIB)/source
1222	@mkdir -p $(MODLIB)/kernel
1223	@ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1224	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1225		rm -f $(MODLIB)/build ; \
1226		ln -s $(CURDIR) $(MODLIB)/build ; \
1227	fi
1228	@cp -f $(objtree)/modules.order $(MODLIB)/
1229	@cp -f $(objtree)/modules.builtin $(MODLIB)/
1230	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1231
1232# This depmod is only for convenience to give the initial
1233# boot a modules.dep even before / is mounted read-write.  However the
1234# boot script depmod is the master version.
1235PHONY += _modinst_post
1236_modinst_post: _modinst_
1237	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1238	$(call cmd,depmod)
1239
1240ifeq ($(CONFIG_MODULE_SIG), y)
1241PHONY += modules_sign
1242modules_sign:
1243	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1244endif
1245
1246else # CONFIG_MODULES
1247
1248# Modules not configured
1249# ---------------------------------------------------------------------------
1250
1251PHONY += modules modules_install
1252modules modules_install:
1253	@echo >&2
1254	@echo >&2 "The present kernel configuration has modules disabled."
1255	@echo >&2 "Type 'make config' and enable loadable module support."
1256	@echo >&2 "Then build a kernel with module support enabled."
1257	@echo >&2
1258	@exit 1
1259
1260endif # CONFIG_MODULES
1261
1262###
1263# Cleaning is done on three levels.
1264# make clean     Delete most generated files
1265#                Leave enough to build external modules
1266# make mrproper  Delete the current configuration, and all generated files
1267# make distclean Remove editor backup files, patch leftover files and the like
1268
1269# Directories & files removed with 'make clean'
1270CLEAN_DIRS  += $(MODVERDIR)
1271
1272# Directories & files removed with 'make mrproper'
1273MRPROPER_DIRS  += include/config usr/include include/generated          \
1274		  arch/*/include/generated .tmp_objdiff
1275MRPROPER_FILES += .config .config.old .version .old_version \
1276		  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1277		  signing_key.pem signing_key.priv signing_key.x509	\
1278		  x509.genkey extra_certificates signing_key.x509.keyid	\
1279		  signing_key.x509.signer vmlinux-gdb.py
1280
1281# clean - Delete most, but leave enough to build external modules
1282#
1283clean: rm-dirs  := $(CLEAN_DIRS)
1284clean: rm-files := $(CLEAN_FILES)
1285clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1286
1287PHONY += $(clean-dirs) clean archclean vmlinuxclean
1288$(clean-dirs):
1289	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1290
1291vmlinuxclean:
1292	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1293	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1294
1295clean: archclean vmlinuxclean
1296
1297# mrproper - Delete all generated files, including .config
1298#
1299mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1300mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1301mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1302
1303PHONY += $(mrproper-dirs) mrproper archmrproper
1304$(mrproper-dirs):
1305	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1306
1307mrproper: clean archmrproper $(mrproper-dirs)
1308	$(call cmd,rmdirs)
1309	$(call cmd,rmfiles)
1310
1311# distclean
1312#
1313PHONY += distclean
1314
1315distclean: mrproper
1316	@find $(srctree) $(RCS_FIND_IGNORE) \
1317		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1318		-o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1319		-o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
1320		-type f -print | xargs rm -f
1321
1322
1323# Packaging of the kernel to various formats
1324# ---------------------------------------------------------------------------
1325# rpm target kept for backward compatibility
1326package-dir	:= scripts/package
1327
1328%src-pkg: FORCE
1329	$(Q)$(MAKE) $(build)=$(package-dir) $@
1330%pkg: include/config/kernel.release FORCE
1331	$(Q)$(MAKE) $(build)=$(package-dir) $@
1332rpm: include/config/kernel.release FORCE
1333	$(Q)$(MAKE) $(build)=$(package-dir) $@
1334
1335
1336# Brief documentation of the typical targets used
1337# ---------------------------------------------------------------------------
1338
1339boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1340boards := $(sort $(notdir $(boards)))
1341board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1342board-dirs := $(sort $(notdir $(board-dirs:/=)))
1343
1344PHONY += help
1345help:
1346	@echo  'Cleaning targets:'
1347	@echo  '  clean		  - Remove most generated files but keep the config and'
1348	@echo  '                    enough build support to build external modules'
1349	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1350	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
1351	@echo  ''
1352	@echo  'Configuration targets:'
1353	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1354	@echo  ''
1355	@echo  'Other generic targets:'
1356	@echo  '  all		  - Build all targets marked with [*]'
1357	@echo  '* vmlinux	  - Build the bare kernel'
1358	@echo  '* modules	  - Build all modules'
1359	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1360	@echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1361	@echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1362	@echo  '  dir/            - Build all files in dir and below'
1363	@echo  '  dir/file.[ois]  - Build specified target only'
1364	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1365	@echo  '                    (requires a recent binutils and recent build (System.map))'
1366	@echo  '  dir/file.ko     - Build module including final link'
1367	@echo  '  modules_prepare - Set up for building external modules'
1368	@echo  '  tags/TAGS	  - Generate tags file for editors'
1369	@echo  '  cscope	  - Generate cscope index'
1370	@echo  '  gtags           - Generate GNU GLOBAL index'
1371	@echo  '  kernelrelease	  - Output the release version string (use with make -s)'
1372	@echo  '  kernelversion	  - Output the version stored in Makefile (use with make -s)'
1373	@echo  '  image_name	  - Output the image name (use with make -s)'
1374	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1375	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1376	 echo  ''
1377	@echo  'Static analysers'
1378	@echo  '  checkstack      - Generate a list of stack hogs'
1379	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1380	@echo  '  versioncheck    - Sanity check on version.h usage'
1381	@echo  '  includecheck    - Check for duplicate included header files'
1382	@echo  '  export_report   - List the usages of all exported symbols'
1383	@echo  '  headers_check   - Sanity check on exported headers'
1384	@echo  '  headerdep       - Detect inclusion cycles in headers'
1385	@$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1386	@echo  ''
1387	@echo  'Kernel selftest'
1388	@echo  '  kselftest       - Build and run kernel selftest (run as root)'
1389	@echo  '                    Build, install, and boot kernel before'
1390	@echo  '                    running kselftest on it'
1391	@echo  '  kselftest-clean - Remove all generated kselftest files'
1392	@echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existed'
1393	@echo  '                    .config.'
1394	@echo  ''
1395	@echo  'Kernel packaging:'
1396	@$(MAKE) $(build)=$(package-dir) help
1397	@echo  ''
1398	@echo  'Documentation targets:'
1399	@$(MAKE) -f $(srctree)/Documentation/Makefile.sphinx dochelp
1400	@echo  ''
1401	@$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1402	@echo  ''
1403	@echo  'Architecture specific targets ($(SRCARCH)):'
1404	@$(if $(archhelp),$(archhelp),\
1405		echo '  No architecture specific help defined for $(SRCARCH)')
1406	@echo  ''
1407	@$(if $(boards), \
1408		$(foreach b, $(boards), \
1409		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1410		echo '')
1411	@$(if $(board-dirs), \
1412		$(foreach b, $(board-dirs), \
1413		printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1414		printf "  %-16s - Show all of the above\\n" help-boards; \
1415		echo '')
1416
1417	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1418	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1419	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1420	@echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1421	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1422	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1423	@echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1424	@echo  '		1: warnings which may be relevant and do not occur too often'
1425	@echo  '		2: warnings which occur quite often but may still be relevant'
1426	@echo  '		3: more obscure warnings, can most likely be ignored'
1427	@echo  '		Multiple levels can be combined with W=12 or W=123'
1428	@echo  ''
1429	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
1430	@echo  'For further info see the ./README file'
1431
1432
1433help-board-dirs := $(addprefix help-,$(board-dirs))
1434
1435help-boards: $(help-board-dirs)
1436
1437boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1438
1439$(help-board-dirs): help-%:
1440	@echo  'Architecture specific targets ($(SRCARCH) $*):'
1441	@$(if $(boards-per-dir), \
1442		$(foreach b, $(boards-per-dir), \
1443		printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1444		echo '')
1445
1446
1447# Documentation targets
1448# ---------------------------------------------------------------------------
1449DOC_TARGETS := xmldocs sgmldocs psdocs latexdocs pdfdocs htmldocs mandocs installmandocs epubdocs cleandocs linkcheckdocs
1450PHONY += $(DOC_TARGETS)
1451$(DOC_TARGETS): scripts_basic FORCE
1452	$(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1453	$(Q)$(MAKE) $(build)=Documentation -f $(srctree)/Documentation/Makefile.sphinx $@
1454	$(Q)$(MAKE) $(build)=Documentation/DocBook $@
1455
1456else # KBUILD_EXTMOD
1457
1458###
1459# External module support.
1460# When building external modules the kernel used as basis is considered
1461# read-only, and no consistency checks are made and the make
1462# system is not used on the basis kernel. If updates are required
1463# in the basis kernel ordinary make commands (without M=...) must
1464# be used.
1465#
1466# The following are the only valid targets when building external
1467# modules.
1468# make M=dir clean     Delete all automatically generated files
1469# make M=dir modules   Make all modules in specified dir
1470# make M=dir	       Same as 'make M=dir modules'
1471# make M=dir modules_install
1472#                      Install the modules built in the module directory
1473#                      Assumes install directory is already created
1474
1475# We are always building modules
1476KBUILD_MODULES := 1
1477PHONY += crmodverdir
1478crmodverdir:
1479	$(cmd_crmodverdir)
1480
1481PHONY += $(objtree)/Module.symvers
1482$(objtree)/Module.symvers:
1483	@test -e $(objtree)/Module.symvers || ( \
1484	echo; \
1485	echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1486	echo "           is missing; modules will have no dependencies and modversions."; \
1487	echo )
1488
1489module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1490PHONY += $(module-dirs) modules
1491$(module-dirs): crmodverdir $(objtree)/Module.symvers
1492	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1493
1494modules: $(module-dirs)
1495	@$(kecho) '  Building modules, stage 2.';
1496	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1497
1498PHONY += modules_install
1499modules_install: _emodinst_ _emodinst_post
1500
1501install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1502PHONY += _emodinst_
1503_emodinst_:
1504	$(Q)mkdir -p $(MODLIB)/$(install-dir)
1505	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1506
1507PHONY += _emodinst_post
1508_emodinst_post: _emodinst_
1509	$(call cmd,depmod)
1510
1511clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1512
1513PHONY += $(clean-dirs) clean
1514$(clean-dirs):
1515	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1516
1517clean:	rm-dirs := $(MODVERDIR)
1518clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1519
1520PHONY += help
1521help:
1522	@echo  '  Building external modules.'
1523	@echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1524	@echo  ''
1525	@echo  '  modules         - default target, build the module(s)'
1526	@echo  '  modules_install - install the module'
1527	@echo  '  clean           - remove generated files in module directory only'
1528	@echo  ''
1529
1530# Dummies...
1531PHONY += prepare scripts
1532prepare: ;
1533scripts: ;
1534endif # KBUILD_EXTMOD
1535
1536clean: $(clean-dirs)
1537	$(call cmd,rmdirs)
1538	$(call cmd,rmfiles)
1539	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1540		\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1541		-o -name '*.ko.*' \
1542		-o -name '*.dwo'  \
1543		-o -name '*.su'  \
1544		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1545		-o -name '*.symtypes' -o -name 'modules.order' \
1546		-o -name modules.builtin -o -name '.tmp_*.o.*' \
1547		-o -name '*.c.[012]*.*' \
1548		-o -name '*.gcno' \) -type f -print | xargs rm -f
1549
1550# Generate tags for editors
1551# ---------------------------------------------------------------------------
1552quiet_cmd_tags = GEN     $@
1553      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1554
1555tags TAGS cscope gtags: FORCE
1556	$(call cmd,tags)
1557
1558# Scripts to check various things for consistency
1559# ---------------------------------------------------------------------------
1560
1561PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1562
1563includecheck:
1564	find $(srctree)/* $(RCS_FIND_IGNORE) \
1565		-name '*.[hcS]' -type f -print | sort \
1566		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1567
1568versioncheck:
1569	find $(srctree)/* $(RCS_FIND_IGNORE) \
1570		-name '*.[hcS]' -type f -print | sort \
1571		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1572
1573coccicheck:
1574	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1575
1576namespacecheck:
1577	$(PERL) $(srctree)/scripts/namespace.pl
1578
1579export_report:
1580	$(PERL) $(srctree)/scripts/export_report.pl
1581
1582endif #ifeq ($(config-targets),1)
1583endif #ifeq ($(mixed-targets),1)
1584
1585PHONY += checkstack kernelrelease kernelversion image_name
1586
1587# UML needs a little special treatment here.  It wants to use the host
1588# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1589# else wants $(ARCH), including people doing cross-builds, which means
1590# that $(SUBARCH) doesn't work here.
1591ifeq ($(ARCH), um)
1592CHECKSTACK_ARCH := $(SUBARCH)
1593else
1594CHECKSTACK_ARCH := $(ARCH)
1595endif
1596checkstack:
1597	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1598	$(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1599
1600kernelrelease:
1601	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1602
1603kernelversion:
1604	@echo $(KERNELVERSION)
1605
1606image_name:
1607	@echo $(KBUILD_IMAGE)
1608
1609# Clear a bunch of variables before executing the submake
1610tools/: FORCE
1611	$(Q)mkdir -p $(objtree)/tools
1612	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1613
1614tools/%: FORCE
1615	$(Q)mkdir -p $(objtree)/tools
1616	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1617
1618# Single targets
1619# ---------------------------------------------------------------------------
1620# Single targets are compatible with:
1621# - build with mixed source and output
1622# - build with separate output dir 'make O=...'
1623# - external modules
1624#
1625#  target-dir => where to store outputfile
1626#  build-dir  => directory in kernel source tree to use
1627
1628ifeq ($(KBUILD_EXTMOD),)
1629        build-dir  = $(patsubst %/,%,$(dir $@))
1630        target-dir = $(dir $@)
1631else
1632        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1633        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1634        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1635endif
1636
1637%.s: %.c prepare scripts FORCE
1638	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1639%.i: %.c prepare scripts FORCE
1640	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1641%.o: %.c prepare scripts FORCE
1642	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1643%.lst: %.c prepare scripts FORCE
1644	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1645%.s: %.S prepare scripts FORCE
1646	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1647%.o: %.S prepare scripts FORCE
1648	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1649%.symtypes: %.c prepare scripts FORCE
1650	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1651
1652# Modules
1653/: prepare scripts FORCE
1654	$(cmd_crmodverdir)
1655	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1656	$(build)=$(build-dir)
1657# Make sure the latest headers are built for Documentation
1658Documentation/ samples/: headers_install
1659%/: prepare scripts FORCE
1660	$(cmd_crmodverdir)
1661	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1662	$(build)=$(build-dir)
1663%.ko: prepare scripts FORCE
1664	$(cmd_crmodverdir)
1665	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1666	$(build)=$(build-dir) $(@:.ko=.o)
1667	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1668
1669# FIXME Should go into a make.lib or something
1670# ===========================================================================
1671
1672quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1673      cmd_rmdirs = rm -rf $(rm-dirs)
1674
1675quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1676      cmd_rmfiles = rm -f $(rm-files)
1677
1678# Run depmod only if we have System.map and depmod is executable
1679quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1680      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1681                   $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1682
1683# Create temporary dir for module support files
1684# clean it up only when building all modules
1685cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1686                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1687
1688# read all saved command lines
1689
1690targets := $(wildcard $(sort $(targets)))
1691cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1692
1693ifneq ($(cmd_files),)
1694  $(cmd_files): ;	# Do not try to update included dependency files
1695  include $(cmd_files)
1696endif
1697
1698endif	# skip-makefile
1699
1700PHONY += FORCE
1701FORCE:
1702
1703# Declare the contents of the .PHONY variable as phony.  We keep that
1704# information in a variable so we can use it in if_changed and friends.
1705.PHONY: $(PHONY)
1706