xref: /openbmc/linux/Makefile (revision 1491eaf9)
1VERSION = 4
2PATCHLEVEL = 8
3SUBLEVEL = 0
4EXTRAVERSION =
5NAME = Psychotic Stoned Sheep
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$(MAKEFLAGS))),)
89  quiet=silent_
90endif
91else					# make-3.8x
92ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
93  quiet=silent_
94endif
95endif
96
97export quiet Q KBUILD_VERBOSE
98
99# kbuild supports saving output files in a separate directory.
100# To locate output files in a separate directory two syntaxes are supported.
101# In both cases the working directory must be the root of the kernel src.
102# 1) O=
103# Use "make O=dir/to/store/output/files/"
104#
105# 2) Set KBUILD_OUTPUT
106# Set the environment variable KBUILD_OUTPUT to point to the directory
107# where the output files shall be placed.
108# export KBUILD_OUTPUT=dir/to/store/output/files/
109# make
110#
111# The O= assignment takes precedence over the KBUILD_OUTPUT environment
112# variable.
113
114# KBUILD_SRC is set on invocation of make in OBJ directory
115# KBUILD_SRC is not intended to be used by the regular user (for now)
116ifeq ($(KBUILD_SRC),)
117
118# OK, Make called in directory where kernel src resides
119# Do we want to locate output files in a separate directory?
120ifeq ("$(origin O)", "command line")
121  KBUILD_OUTPUT := $(O)
122endif
123
124# That's our default target when none is given on the command line
125PHONY := _all
126_all:
127
128# Cancel implicit rules on top Makefile
129$(CURDIR)/Makefile Makefile: ;
130
131ifneq ($(words $(subst :, ,$(CURDIR))), 1)
132  $(error main directory cannot contain spaces nor colons)
133endif
134
135ifneq ($(KBUILD_OUTPUT),)
136# Invoke a second make in the output directory, passing relevant variables
137# check that the output directory actually exists
138saved-output := $(KBUILD_OUTPUT)
139KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
140								&& /bin/pwd)
141$(if $(KBUILD_OUTPUT),, \
142     $(error failed to create output directory "$(saved-output)"))
143
144PHONY += $(MAKECMDGOALS) sub-make
145
146$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
147	@:
148
149sub-make:
150	$(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
151	-f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
152
153# Leave processing to above invocation of make
154skip-makefile := 1
155endif # ifneq ($(KBUILD_OUTPUT),)
156endif # ifeq ($(KBUILD_SRC),)
157
158# We process the rest of the Makefile if this is the final invocation of make
159ifeq ($(skip-makefile),)
160
161# Do not print "Entering directory ...",
162# but we want to display it when entering to the output directory
163# so that IDEs/editors are able to understand relative filenames.
164MAKEFLAGS += --no-print-directory
165
166# Call a source code checker (by default, "sparse") as part of the
167# C compilation.
168#
169# Use 'make C=1' to enable checking of only re-compiled files.
170# Use 'make C=2' to enable checking of *all* source files, regardless
171# of whether they are re-compiled or not.
172#
173# See the file "Documentation/sparse.txt" for more details, including
174# where to get the "sparse" utility.
175
176ifeq ("$(origin C)", "command line")
177  KBUILD_CHECKSRC = $(C)
178endif
179ifndef KBUILD_CHECKSRC
180  KBUILD_CHECKSRC = 0
181endif
182
183# Use make M=dir to specify directory of external module to build
184# Old syntax make ... SUBDIRS=$PWD is still supported
185# Setting the environment variable KBUILD_EXTMOD take precedence
186ifdef SUBDIRS
187  KBUILD_EXTMOD ?= $(SUBDIRS)
188endif
189
190ifeq ("$(origin M)", "command line")
191  KBUILD_EXTMOD := $(M)
192endif
193
194# If building an external module we do not care about the all: rule
195# but instead _all depend on modules
196PHONY += all
197ifeq ($(KBUILD_EXTMOD),)
198_all: all
199else
200_all: modules
201endif
202
203ifeq ($(KBUILD_SRC),)
204        # building in the source tree
205        srctree := .
206else
207        ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
208                # building in a subdirectory of the source tree
209                srctree := ..
210        else
211                srctree := $(KBUILD_SRC)
212        endif
213endif
214objtree		:= .
215src		:= $(srctree)
216obj		:= $(objtree)
217
218VPATH		:= $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
219
220export srctree objtree VPATH
221
222# SUBARCH tells the usermode build what the underlying arch is.  That is set
223# first, and if a usermode build is happening, the "ARCH=um" on the command
224# line overrides the setting of ARCH below.  If a native build is happening,
225# then ARCH is assigned, getting whatever value it gets normally, and
226# SUBARCH is subsequently ignored.
227
228SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
229				  -e s/sun4u/sparc64/ \
230				  -e s/arm.*/arm/ -e s/sa110/arm/ \
231				  -e s/s390x/s390/ -e s/parisc64/parisc/ \
232				  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
233				  -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
234
235# Cross compiling and selecting different set of gcc/bin-utils
236# ---------------------------------------------------------------------------
237#
238# When performing cross compilation for other architectures ARCH shall be set
239# to the target architecture. (See arch/* for the possibilities).
240# ARCH can be set during invocation of make:
241# make ARCH=ia64
242# Another way is to have ARCH set in the environment.
243# The default ARCH is the host where make is executed.
244
245# CROSS_COMPILE specify the prefix used for all executables used
246# during compilation. Only gcc and related bin-utils executables
247# are prefixed with $(CROSS_COMPILE).
248# CROSS_COMPILE can be set on the command line
249# make CROSS_COMPILE=ia64-linux-
250# Alternatively CROSS_COMPILE can be set in the environment.
251# A third alternative is to store a setting in .config so that plain
252# "make" in the configured kernel build directory always uses that.
253# Default value for CROSS_COMPILE is not to prefix executables
254# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
255ARCH		?= $(SUBARCH)
256CROSS_COMPILE	?= $(CONFIG_CROSS_COMPILE:"%"=%)
257
258# Architecture as present in compile.h
259UTS_MACHINE 	:= $(ARCH)
260SRCARCH 	:= $(ARCH)
261
262# Additional ARCH settings for x86
263ifeq ($(ARCH),i386)
264        SRCARCH := x86
265endif
266ifeq ($(ARCH),x86_64)
267        SRCARCH := x86
268endif
269
270# Additional ARCH settings for sparc
271ifeq ($(ARCH),sparc32)
272       SRCARCH := sparc
273endif
274ifeq ($(ARCH),sparc64)
275       SRCARCH := sparc
276endif
277
278# Additional ARCH settings for sh
279ifeq ($(ARCH),sh64)
280       SRCARCH := sh
281endif
282
283# Additional ARCH settings for tile
284ifeq ($(ARCH),tilepro)
285       SRCARCH := tile
286endif
287ifeq ($(ARCH),tilegx)
288       SRCARCH := tile
289endif
290
291# Where to locate arch specific headers
292hdr-arch  := $(SRCARCH)
293
294KCONFIG_CONFIG	?= .config
295export KCONFIG_CONFIG
296
297# SHELL used by kbuild
298CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
299	  else if [ -x /bin/bash ]; then echo /bin/bash; \
300	  else echo sh; fi ; fi)
301
302HOSTCC       = gcc
303HOSTCXX      = g++
304HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
305HOSTCXXFLAGS = -O2
306
307ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
308HOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
309		-Wno-missing-field-initializers -fno-delete-null-pointer-checks
310endif
311
312# Decide whether to build built-in, modular, or both.
313# Normally, just do built-in.
314
315KBUILD_MODULES :=
316KBUILD_BUILTIN := 1
317
318# If we have only "make modules", don't compile built-in objects.
319# When we're building modules with modversions, we need to consider
320# the built-in objects during the descend as well, in order to
321# make sure the checksums are up to date before we record them.
322
323ifeq ($(MAKECMDGOALS),modules)
324  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
325endif
326
327# If we have "make <whatever> modules", compile modules
328# in addition to whatever we do anyway.
329# Just "make" or "make all" shall build modules as well
330
331ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
332  KBUILD_MODULES := 1
333endif
334
335ifeq ($(MAKECMDGOALS),)
336  KBUILD_MODULES := 1
337endif
338
339export KBUILD_MODULES KBUILD_BUILTIN
340export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
341
342# We need some generic definitions (do not try to remake the file).
343scripts/Kbuild.include: ;
344include scripts/Kbuild.include
345
346# Make variables (CC, etc...)
347AS		= $(CROSS_COMPILE)as
348LD		= $(CROSS_COMPILE)ld
349CC		= $(CROSS_COMPILE)gcc
350CPP		= $(CC) -E
351AR		= $(CROSS_COMPILE)ar
352NM		= $(CROSS_COMPILE)nm
353STRIP		= $(CROSS_COMPILE)strip
354OBJCOPY		= $(CROSS_COMPILE)objcopy
355OBJDUMP		= $(CROSS_COMPILE)objdump
356AWK		= awk
357GENKSYMS	= scripts/genksyms/genksyms
358INSTALLKERNEL  := installkernel
359DEPMOD		= /sbin/depmod
360PERL		= perl
361PYTHON		= python
362CHECK		= sparse
363
364CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
365		  -Wbitwise -Wno-return-void $(CF)
366NOSTDINC_FLAGS  =
367CFLAGS_MODULE   =
368AFLAGS_MODULE   =
369LDFLAGS_MODULE  =
370CFLAGS_KERNEL	=
371AFLAGS_KERNEL	=
372LDFLAGS_vmlinux =
373CFLAGS_GCOV	= -fprofile-arcs -ftest-coverage -fno-tree-loop-im
374CFLAGS_KCOV	:= $(call cc-option,-fsanitize-coverage=trace-pc,)
375
376
377# Use USERINCLUDE when you must reference the UAPI directories only.
378USERINCLUDE    := \
379		-I$(srctree)/arch/$(hdr-arch)/include/uapi \
380		-I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
381		-I$(srctree)/include/uapi \
382		-I$(objtree)/include/generated/uapi \
383                -include $(srctree)/include/linux/kconfig.h
384
385# Use LINUXINCLUDE when you must reference the include/ directory.
386# Needed to be compatible with the O= option
387LINUXINCLUDE    := \
388		-I$(srctree)/arch/$(hdr-arch)/include \
389		-I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
390		-I$(objtree)/arch/$(hdr-arch)/include/generated \
391		$(if $(KBUILD_SRC), -I$(srctree)/include) \
392		-I$(objtree)/include
393
394LINUXINCLUDE	+= $(filter-out $(LINUXINCLUDE),$(USERINCLUDE))
395
396KBUILD_CPPFLAGS := -D__KERNEL__
397
398KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
399		   -fno-strict-aliasing -fno-common \
400		   -Werror-implicit-function-declaration \
401		   -Wno-format-security \
402		   -std=gnu89
403
404KBUILD_AFLAGS_KERNEL :=
405KBUILD_CFLAGS_KERNEL :=
406KBUILD_AFLAGS   := -D__ASSEMBLY__
407KBUILD_AFLAGS_MODULE  := -DMODULE
408KBUILD_CFLAGS_MODULE  := -DMODULE
409KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
410
411# Read KERNELRELEASE from include/config/kernel.release (if it exists)
412KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
413KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
414
415export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
416export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
417export CPP AR NM STRIP OBJCOPY OBJDUMP
418export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
419export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
420
421export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
422export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
423export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
424export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
425export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
426export KBUILD_ARFLAGS
427
428# When compiling out-of-tree modules, put MODVERDIR in the module
429# tree rather than in the kernel tree. The kernel tree might
430# even be read-only.
431export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
432
433# Files to ignore in find ... statements
434
435export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
436			  -name CVS -o -name .pc -o -name .hg -o -name .git \) \
437			  -prune -o
438export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
439			 --exclude CVS --exclude .pc --exclude .hg --exclude .git
440
441# ===========================================================================
442# Rules shared between *config targets and build targets
443
444# Basic helpers built in scripts/
445PHONY += scripts_basic
446scripts_basic:
447	$(Q)$(MAKE) $(build)=scripts/basic
448	$(Q)rm -f .tmp_quiet_recordmcount
449
450# To avoid any implicit rule to kick in, define an empty command.
451scripts/basic/%: scripts_basic ;
452
453PHONY += outputmakefile
454# outputmakefile generates a Makefile in the output directory, if using a
455# separate output directory. This allows convenient use of make in the
456# output directory.
457outputmakefile:
458ifneq ($(KBUILD_SRC),)
459	$(Q)ln -fsn $(srctree) source
460	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
461	    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
462endif
463
464# Support for using generic headers in asm-generic
465PHONY += asm-generic
466asm-generic:
467	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
468	            src=asm obj=arch/$(SRCARCH)/include/generated/asm
469	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
470	            src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
471
472# To make sure we do not include .config for any of the *config targets
473# catch them early, and hand them over to scripts/kconfig/Makefile
474# It is allowed to specify more targets when calling make, including
475# mixing *config targets and build targets.
476# For example 'make oldconfig all'.
477# Detect when mixed targets is specified, and make a second invocation
478# of make so .config is not included in this case either (for *config).
479
480version_h := include/generated/uapi/linux/version.h
481old_version_h := include/linux/version.h
482
483no-dot-config-targets := clean mrproper distclean \
484			 cscope gtags TAGS tags help% %docs check% coccicheck \
485			 $(version_h) headers_% archheaders archscripts \
486			 kernelversion %src-pkg
487
488config-targets := 0
489mixed-targets  := 0
490dot-config     := 1
491
492ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
493	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
494		dot-config := 0
495	endif
496endif
497
498ifeq ($(KBUILD_EXTMOD),)
499        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
500                config-targets := 1
501                ifneq ($(words $(MAKECMDGOALS)),1)
502                        mixed-targets := 1
503                endif
504        endif
505endif
506# install and module_install need also be processed one by one
507ifneq ($(filter install,$(MAKECMDGOALS)),)
508        ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
509	        mixed-targets := 1
510        endif
511endif
512
513ifeq ($(mixed-targets),1)
514# ===========================================================================
515# We're called with mixed targets (*config and build targets).
516# Handle them one by one.
517
518PHONY += $(MAKECMDGOALS) __build_one_by_one
519
520$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
521	@:
522
523__build_one_by_one:
524	$(Q)set -e; \
525	for i in $(MAKECMDGOALS); do \
526		$(MAKE) -f $(srctree)/Makefile $$i; \
527	done
528
529else
530ifeq ($(config-targets),1)
531# ===========================================================================
532# *config targets only - make sure prerequisites are updated, and descend
533# in scripts/kconfig to make the *config target
534
535# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
536# KBUILD_DEFCONFIG may point out an alternative default configuration
537# used for 'make defconfig'
538include arch/$(SRCARCH)/Makefile
539export KBUILD_DEFCONFIG KBUILD_KCONFIG
540
541config: scripts_basic outputmakefile FORCE
542	$(Q)$(MAKE) $(build)=scripts/kconfig $@
543
544%config: scripts_basic outputmakefile FORCE
545	$(Q)$(MAKE) $(build)=scripts/kconfig $@
546
547else
548# ===========================================================================
549# Build targets only - this includes vmlinux, arch specific targets, clean
550# targets and others. In general all targets except *config targets.
551
552ifeq ($(KBUILD_EXTMOD),)
553# Additional helpers built in scripts/
554# Carefully list dependencies so we do not try to build scripts twice
555# in parallel
556PHONY += scripts
557scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
558	 asm-generic gcc-plugins
559	$(Q)$(MAKE) $(build)=$(@)
560
561# Objects we will link into vmlinux / subdirs we need to visit
562init-y		:= init/
563drivers-y	:= drivers/ sound/ firmware/
564net-y		:= net/
565libs-y		:= lib/
566core-y		:= usr/
567virt-y		:= virt/
568endif # KBUILD_EXTMOD
569
570ifeq ($(dot-config),1)
571# Read in config
572-include include/config/auto.conf
573
574ifeq ($(KBUILD_EXTMOD),)
575# Read in dependencies to all Kconfig* files, make sure to run
576# oldconfig if changes are detected.
577-include include/config/auto.conf.cmd
578
579# To avoid any implicit rule to kick in, define an empty command
580$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
581
582# If .config is newer than include/config/auto.conf, someone tinkered
583# with it and forgot to run make oldconfig.
584# if auto.conf.cmd is missing then we are probably in a cleaned tree so
585# we execute the config step to be sure to catch updated Kconfig files
586include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
587	$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
588else
589# external modules needs include/generated/autoconf.h and include/config/auto.conf
590# but do not care if they are up-to-date. Use auto.conf to trigger the test
591PHONY += include/config/auto.conf
592
593include/config/auto.conf:
594	$(Q)test -e include/generated/autoconf.h -a -e $@ || (		\
595	echo >&2;							\
596	echo >&2 "  ERROR: Kernel configuration is invalid.";		\
597	echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
598	echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";	\
599	echo >&2 ;							\
600	/bin/false)
601
602endif # KBUILD_EXTMOD
603
604else
605# Dummy target needed, because used as prerequisite
606include/config/auto.conf: ;
607endif # $(dot-config)
608
609# The all: target is the default when no target is given on the
610# command line.
611# This allow a user to issue only 'make' to build a kernel including modules
612# Defaults to vmlinux, but the arch makefile usually adds further targets
613all: vmlinux
614
615# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
616# values of the respective KBUILD_* variables
617ARCH_CPPFLAGS :=
618ARCH_AFLAGS :=
619ARCH_CFLAGS :=
620include arch/$(SRCARCH)/Makefile
621
622KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
623KBUILD_CFLAGS	+= $(call cc-disable-warning,maybe-uninitialized,)
624
625ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
626KBUILD_CFLAGS	+= -Os
627else
628ifdef CONFIG_PROFILE_ALL_BRANCHES
629KBUILD_CFLAGS	+= -O2
630else
631KBUILD_CFLAGS   += -O2
632endif
633endif
634
635# Tell gcc to never replace conditional load with a non-conditional one
636KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)
637
638include scripts/Makefile.gcc-plugins
639
640ifdef CONFIG_READABLE_ASM
641# Disable optimizations that make assembler listings hard to read.
642# reorder blocks reorders the control in the function
643# ipa clone creates specialized cloned functions
644# partial inlining inlines only parts of functions
645KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
646                 $(call cc-option,-fno-ipa-cp-clone,) \
647                 $(call cc-option,-fno-partial-inlining)
648endif
649
650ifneq ($(CONFIG_FRAME_WARN),0)
651KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
652endif
653
654# This selects the stack protector compiler flag. Testing it is delayed
655# until after .config has been reprocessed, in the prepare-compiler-check
656# target.
657ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
658  stackp-flag := -fstack-protector
659  stackp-name := REGULAR
660else
661ifdef CONFIG_CC_STACKPROTECTOR_STRONG
662  stackp-flag := -fstack-protector-strong
663  stackp-name := STRONG
664else
665  # Force off for distro compilers that enable stack protector by default.
666  stackp-flag := $(call cc-option, -fno-stack-protector)
667endif
668endif
669# Find arch-specific stack protector compiler sanity-checking script.
670ifdef CONFIG_CC_STACKPROTECTOR
671  stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
672  stackp-check := $(wildcard $(stackp-path))
673endif
674KBUILD_CFLAGS += $(stackp-flag)
675
676ifeq ($(cc-name),clang)
677KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
678KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
679KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
680KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
681KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
682# Quiet clang warning: comparison of unsigned expression < 0 is always false
683KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
684# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
685# source of a reference will be _MergedGlobals and not on of the whitelisted names.
686# See modpost pattern 2
687KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
688KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
689else
690
691# These warnings generated too much noise in a regular build.
692# Use make W=1 to enable them (see scripts/Makefile.build)
693KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
694KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
695endif
696
697ifdef CONFIG_FRAME_POINTER
698KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
699else
700# Some targets (ARM with Thumb2, for example), can't be built with frame
701# pointers.  For those, we don't have FUNCTION_TRACER automatically
702# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
703# incompatible with -fomit-frame-pointer with current GCC, so we don't use
704# -fomit-frame-pointer with FUNCTION_TRACER.
705ifndef CONFIG_FUNCTION_TRACER
706KBUILD_CFLAGS	+= -fomit-frame-pointer
707endif
708endif
709
710KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
711
712ifdef CONFIG_DEBUG_INFO
713ifdef CONFIG_DEBUG_INFO_SPLIT
714KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
715else
716KBUILD_CFLAGS	+= -g
717endif
718KBUILD_AFLAGS	+= -Wa,-gdwarf-2
719endif
720ifdef CONFIG_DEBUG_INFO_DWARF4
721KBUILD_CFLAGS	+= $(call cc-option, -gdwarf-4,)
722endif
723
724ifdef CONFIG_DEBUG_INFO_REDUCED
725KBUILD_CFLAGS 	+= $(call cc-option, -femit-struct-debug-baseonly) \
726		   $(call cc-option,-fno-var-tracking)
727endif
728
729ifdef CONFIG_FUNCTION_TRACER
730ifndef CC_FLAGS_FTRACE
731CC_FLAGS_FTRACE := -pg
732endif
733export CC_FLAGS_FTRACE
734ifdef CONFIG_HAVE_FENTRY
735CC_USING_FENTRY	:= $(call cc-option, -mfentry -DCC_USING_FENTRY)
736endif
737KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
738KBUILD_AFLAGS	+= $(CC_USING_FENTRY)
739ifdef CONFIG_DYNAMIC_FTRACE
740	ifdef CONFIG_HAVE_C_RECORDMCOUNT
741		BUILD_C_RECORDMCOUNT := y
742		export BUILD_C_RECORDMCOUNT
743	endif
744endif
745endif
746
747# We trigger additional mismatches with less inlining
748ifdef CONFIG_DEBUG_SECTION_MISMATCH
749KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
750endif
751
752# arch Makefile may override CC so keep this after arch Makefile is included
753NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
754CHECKFLAGS     += $(NOSTDINC_FLAGS)
755
756# warn about C99 declaration after statement
757KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
758
759# disable pointer signed / unsigned warnings in gcc 4.0
760KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
761
762# disable invalid "can't wrap" optimizations for signed / pointers
763KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
764
765# conserve stack if available
766KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
767
768# disallow errors like 'EXPORT_GPL(foo);' with missing header
769KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
770
771# require functions to have arguments in prototypes, not empty 'int foo()'
772KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
773
774# Prohibit date/time macros, which would make the build non-deterministic
775KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
776
777# enforce correct pointer usage
778KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
779
780# use the deterministic mode of AR if available
781KBUILD_ARFLAGS := $(call ar-option,D)
782
783# check for 'asm goto'
784ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
785	KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
786	KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
787endif
788
789include scripts/Makefile.kasan
790include scripts/Makefile.extrawarn
791include scripts/Makefile.ubsan
792
793# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
794# last assignments
795KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
796KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
797KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
798
799# Use --build-id when available.
800LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
801			      $(call cc-ldoption, -Wl$(comma)--build-id,))
802KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
803LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
804
805ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
806LDFLAGS_vmlinux	+= $(call ld-option, -X,)
807endif
808
809# Default kernel image to build when no specific target is given.
810# KBUILD_IMAGE may be overruled on the command line or
811# set in the environment
812# Also any assignments in arch/$(ARCH)/Makefile take precedence over
813# this default value
814export KBUILD_IMAGE ?= vmlinux
815
816#
817# INSTALL_PATH specifies where to place the updated kernel and system map
818# images. Default is /boot, but you can set it to other values
819export	INSTALL_PATH ?= /boot
820
821#
822# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
823# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
824# an argument if needed. Otherwise it defaults to the kernel install path
825#
826export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
827
828#
829# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
830# relocations required by build roots.  This is not defined in the
831# makefile but the argument can be passed to make if needed.
832#
833
834MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
835export MODLIB
836
837#
838# INSTALL_MOD_STRIP, if defined, will cause modules to be
839# stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
840# the default option --strip-debug will be used.  Otherwise,
841# INSTALL_MOD_STRIP value will be used as the options to the strip command.
842
843ifdef INSTALL_MOD_STRIP
844ifeq ($(INSTALL_MOD_STRIP),1)
845mod_strip_cmd = $(STRIP) --strip-debug
846else
847mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
848endif # INSTALL_MOD_STRIP=1
849else
850mod_strip_cmd = true
851endif # INSTALL_MOD_STRIP
852export mod_strip_cmd
853
854# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
855# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
856# or CONFIG_MODULE_COMPRESS_XZ.
857
858mod_compress_cmd = true
859ifdef CONFIG_MODULE_COMPRESS
860  ifdef CONFIG_MODULE_COMPRESS_GZIP
861    mod_compress_cmd = gzip -n -f
862  endif # CONFIG_MODULE_COMPRESS_GZIP
863  ifdef CONFIG_MODULE_COMPRESS_XZ
864    mod_compress_cmd = xz -f
865  endif # CONFIG_MODULE_COMPRESS_XZ
866endif # CONFIG_MODULE_COMPRESS
867export mod_compress_cmd
868
869# Select initial ramdisk compression format, default is gzip(1).
870# This shall be used by the dracut(8) tool while creating an initramfs image.
871#
872INITRD_COMPRESS-y                  := gzip
873INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
874INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
875INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
876INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
877INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
878# do not export INITRD_COMPRESS, since we didn't actually
879# choose a sane default compression above.
880# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
881
882ifdef CONFIG_MODULE_SIG_ALL
883$(eval $(call config_filename,MODULE_SIG_KEY))
884
885mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
886else
887mod_sign_cmd = true
888endif
889export mod_sign_cmd
890
891
892ifeq ($(KBUILD_EXTMOD),)
893core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
894
895vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
896		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
897		     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
898
899vmlinux-alldirs	:= $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
900		     $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
901
902init-y		:= $(patsubst %/, %/built-in.o, $(init-y))
903core-y		:= $(patsubst %/, %/built-in.o, $(core-y))
904drivers-y	:= $(patsubst %/, %/built-in.o, $(drivers-y))
905net-y		:= $(patsubst %/, %/built-in.o, $(net-y))
906libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
907libs-y2		:= $(patsubst %/, %/built-in.o, $(libs-y))
908libs-y		:= $(libs-y1) $(libs-y2)
909virt-y		:= $(patsubst %/, %/built-in.o, $(virt-y))
910
911# Externally visible symbols (used by link-vmlinux.sh)
912export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
913export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
914export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
915export LDFLAGS_vmlinux
916# used by scripts/pacmage/Makefile
917export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
918
919vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
920
921# Include targets which we want to execute sequentially if the rest of the
922# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
923# evaluated more than once.
924PHONY += vmlinux_prereq
925vmlinux_prereq: $(vmlinux-deps) FORCE
926ifdef CONFIG_HEADERS_CHECK
927	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
928endif
929ifdef CONFIG_BUILD_DOCSRC
930	$(Q)$(MAKE) $(build)=Documentation
931endif
932ifdef CONFIG_GDB_SCRIPTS
933	$(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
934endif
935ifdef CONFIG_TRIM_UNUSED_KSYMS
936	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
937	  "$(MAKE) KBUILD_MODULES=1 -f $(srctree)/Makefile vmlinux_prereq"
938endif
939
940# standalone target for easier testing
941include/generated/autoksyms.h: FORCE
942	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
943
944# Final link of vmlinux
945      cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
946quiet_cmd_link-vmlinux = LINK    $@
947
948vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
949	+$(call if_changed,link-vmlinux)
950
951# Build samples along the rest of the kernel
952ifdef CONFIG_SAMPLES
953vmlinux-dirs += samples
954endif
955
956# The actual objects are generated when descending,
957# make sure no implicit rule kicks in
958$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
959
960# Handle descending into subdirectories listed in $(vmlinux-dirs)
961# Preset locale variables to speed up the build process. Limit locale
962# tweaks to this spot to avoid wrong language settings when running
963# make menuconfig etc.
964# Error messages still appears in the original language
965
966PHONY += $(vmlinux-dirs)
967$(vmlinux-dirs): prepare scripts
968	$(Q)$(MAKE) $(build)=$@
969
970define filechk_kernel.release
971	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
972endef
973
974# Store (new) KERNELRELEASE string in include/config/kernel.release
975include/config/kernel.release: include/config/auto.conf FORCE
976	$(call filechk,kernel.release)
977
978
979# Things we need to do before we recursively start building the kernel
980# or the modules are listed in "prepare".
981# A multi level approach is used. prepareN is processed before prepareN-1.
982# archprepare is used in arch Makefiles and when processed asm symlink,
983# version.h and scripts_basic is processed / created.
984
985# Listed in dependency order
986PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
987
988# prepare3 is used to check if we are building in a separate output directory,
989# and if so do:
990# 1) Check that make has not been executed in the kernel src $(srctree)
991prepare3: include/config/kernel.release
992ifneq ($(KBUILD_SRC),)
993	@$(kecho) '  Using $(srctree) as source for kernel'
994	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
995		echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
996		echo >&2 "  in the '$(srctree)' directory.";\
997		/bin/false; \
998	fi;
999endif
1000
1001# prepare2 creates a makefile if using a separate output directory.
1002# From this point forward, .config has been reprocessed, so any rules
1003# that need to depend on updated CONFIG_* values can be checked here.
1004prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1005
1006prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1007                   include/config/auto.conf
1008	$(cmd_crmodverdir)
1009	$(Q)test -e include/generated/autoksyms.h || \
1010	    touch   include/generated/autoksyms.h
1011
1012archprepare: archheaders archscripts prepare1 scripts_basic
1013
1014prepare0: archprepare gcc-plugins
1015	$(Q)$(MAKE) $(build)=.
1016
1017# All the preparing..
1018prepare: prepare0 prepare-objtool
1019
1020ifdef CONFIG_STACK_VALIDATION
1021  has_libelf := $(call try-run,\
1022		echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
1023  ifeq ($(has_libelf),1)
1024    objtool_target := tools/objtool FORCE
1025  else
1026    $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
1027    SKIP_STACK_VALIDATION := 1
1028    export SKIP_STACK_VALIDATION
1029  endif
1030endif
1031
1032PHONY += prepare-objtool
1033prepare-objtool: $(objtool_target)
1034
1035# Check for CONFIG flags that require compiler support. Abort the build
1036# after .config has been processed, but before the kernel build starts.
1037#
1038# For security-sensitive CONFIG options, we don't want to fallback and/or
1039# silently change which compiler flags will be used, since that leads to
1040# producing kernels with different security feature characteristics
1041# depending on the compiler used. (For example, "But I selected
1042# CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1043PHONY += prepare-compiler-check
1044prepare-compiler-check: FORCE
1045# Make sure compiler supports requested stack protector flag.
1046ifdef stackp-name
1047  ifeq ($(call cc-option, $(stackp-flag)),)
1048	@echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1049		  $(stackp-flag) not supported by compiler >&2 && exit 1
1050  endif
1051endif
1052# Make sure compiler does not have buggy stack-protector support.
1053ifdef stackp-check
1054  ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1055	@echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1056                  $(stackp-flag) available but compiler is broken >&2 && exit 1
1057  endif
1058endif
1059	@:
1060
1061# Generate some files
1062# ---------------------------------------------------------------------------
1063
1064# KERNELRELEASE can change from a few different places, meaning version.h
1065# needs to be updated, so this check is forced on all builds
1066
1067uts_len := 64
1068define filechk_utsrelease.h
1069	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1070	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1071	  exit 1;                                                         \
1072	fi;                                                               \
1073	(echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1074endef
1075
1076define filechk_version.h
1077	(echo \#define LINUX_VERSION_CODE $(shell                         \
1078	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1079	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1080endef
1081
1082$(version_h): $(srctree)/Makefile FORCE
1083	$(call filechk,version.h)
1084	$(Q)rm -f $(old_version_h)
1085
1086include/generated/utsrelease.h: include/config/kernel.release FORCE
1087	$(call filechk,utsrelease.h)
1088
1089PHONY += headerdep
1090headerdep:
1091	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1092	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1093
1094# ---------------------------------------------------------------------------
1095# Firmware install
1096INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1097export INSTALL_FW_PATH
1098
1099PHONY += firmware_install
1100firmware_install:
1101	@mkdir -p $(objtree)/firmware
1102	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1103
1104# ---------------------------------------------------------------------------
1105# Kernel headers
1106
1107#Default location for installed headers
1108export INSTALL_HDR_PATH = $(objtree)/usr
1109
1110# If we do an all arch process set dst to asm-$(hdr-arch)
1111hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1112
1113PHONY += archheaders
1114archheaders:
1115
1116PHONY += archscripts
1117archscripts:
1118
1119PHONY += __headers
1120__headers: $(version_h) scripts_basic asm-generic archheaders archscripts
1121	$(Q)$(MAKE) $(build)=scripts build_unifdef
1122
1123PHONY += headers_install_all
1124headers_install_all:
1125	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1126
1127PHONY += headers_install
1128headers_install: __headers
1129	$(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1130	  $(error Headers not exportable for the $(SRCARCH) architecture))
1131	$(Q)$(MAKE) $(hdr-inst)=include/uapi
1132	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1133
1134PHONY += headers_check_all
1135headers_check_all: headers_install_all
1136	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1137
1138PHONY += headers_check
1139headers_check: headers_install
1140	$(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1141	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1142
1143# ---------------------------------------------------------------------------
1144# Kernel selftest
1145
1146PHONY += kselftest
1147kselftest:
1148	$(Q)$(MAKE) -C tools/testing/selftests run_tests
1149
1150kselftest-clean:
1151	$(Q)$(MAKE) -C tools/testing/selftests clean
1152
1153PHONY += kselftest-merge
1154kselftest-merge:
1155	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1156	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1157		-m $(objtree)/.config \
1158		$(srctree)/tools/testing/selftests/*/config
1159	+$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1160
1161# ---------------------------------------------------------------------------
1162# Modules
1163
1164ifdef CONFIG_MODULES
1165
1166# By default, build modules as well
1167
1168all: modules
1169
1170# Build modules
1171#
1172# A module can be listed more than once in obj-m resulting in
1173# duplicate lines in modules.order files.  Those are removed
1174# using awk while concatenating to the final file.
1175
1176PHONY += modules
1177modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1178	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1179	@$(kecho) '  Building modules, stage 2.';
1180	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1181	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1182
1183modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1184	$(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1185
1186%/modules.builtin: include/config/auto.conf
1187	$(Q)$(MAKE) $(modbuiltin)=$*
1188
1189
1190# Target to prepare building external modules
1191PHONY += modules_prepare
1192modules_prepare: prepare scripts
1193
1194# Target to install modules
1195PHONY += modules_install
1196modules_install: _modinst_ _modinst_post
1197
1198PHONY += _modinst_
1199_modinst_:
1200	@rm -rf $(MODLIB)/kernel
1201	@rm -f $(MODLIB)/source
1202	@mkdir -p $(MODLIB)/kernel
1203	@ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1204	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1205		rm -f $(MODLIB)/build ; \
1206		ln -s $(CURDIR) $(MODLIB)/build ; \
1207	fi
1208	@cp -f $(objtree)/modules.order $(MODLIB)/
1209	@cp -f $(objtree)/modules.builtin $(MODLIB)/
1210	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1211
1212# This depmod is only for convenience to give the initial
1213# boot a modules.dep even before / is mounted read-write.  However the
1214# boot script depmod is the master version.
1215PHONY += _modinst_post
1216_modinst_post: _modinst_
1217	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1218	$(call cmd,depmod)
1219
1220ifeq ($(CONFIG_MODULE_SIG), y)
1221PHONY += modules_sign
1222modules_sign:
1223	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1224endif
1225
1226else # CONFIG_MODULES
1227
1228# Modules not configured
1229# ---------------------------------------------------------------------------
1230
1231PHONY += modules modules_install
1232modules modules_install:
1233	@echo >&2
1234	@echo >&2 "The present kernel configuration has modules disabled."
1235	@echo >&2 "Type 'make config' and enable loadable module support."
1236	@echo >&2 "Then build a kernel with module support enabled."
1237	@echo >&2
1238	@exit 1
1239
1240endif # CONFIG_MODULES
1241
1242###
1243# Cleaning is done on three levels.
1244# make clean     Delete most generated files
1245#                Leave enough to build external modules
1246# make mrproper  Delete the current configuration, and all generated files
1247# make distclean Remove editor backup files, patch leftover files and the like
1248
1249# Directories & files removed with 'make clean'
1250CLEAN_DIRS  += $(MODVERDIR)
1251
1252# Directories & files removed with 'make mrproper'
1253MRPROPER_DIRS  += include/config usr/include include/generated          \
1254		  arch/*/include/generated .tmp_objdiff
1255MRPROPER_FILES += .config .config.old .version .old_version \
1256		  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1257		  signing_key.pem signing_key.priv signing_key.x509	\
1258		  x509.genkey extra_certificates signing_key.x509.keyid	\
1259		  signing_key.x509.signer vmlinux-gdb.py
1260
1261# clean - Delete most, but leave enough to build external modules
1262#
1263clean: rm-dirs  := $(CLEAN_DIRS)
1264clean: rm-files := $(CLEAN_FILES)
1265clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1266
1267PHONY += $(clean-dirs) clean archclean vmlinuxclean
1268$(clean-dirs):
1269	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1270
1271vmlinuxclean:
1272	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1273
1274clean: archclean vmlinuxclean
1275
1276# mrproper - Delete all generated files, including .config
1277#
1278mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1279mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1280mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1281
1282PHONY += $(mrproper-dirs) mrproper archmrproper
1283$(mrproper-dirs):
1284	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1285
1286mrproper: clean archmrproper $(mrproper-dirs)
1287	$(call cmd,rmdirs)
1288	$(call cmd,rmfiles)
1289
1290# distclean
1291#
1292PHONY += distclean
1293
1294distclean: mrproper
1295	@find $(srctree) $(RCS_FIND_IGNORE) \
1296		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1297		-o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1298		-o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
1299		-type f -print | xargs rm -f
1300
1301
1302# Packaging of the kernel to various formats
1303# ---------------------------------------------------------------------------
1304# rpm target kept for backward compatibility
1305package-dir	:= scripts/package
1306
1307%src-pkg: FORCE
1308	$(Q)$(MAKE) $(build)=$(package-dir) $@
1309%pkg: include/config/kernel.release FORCE
1310	$(Q)$(MAKE) $(build)=$(package-dir) $@
1311rpm: include/config/kernel.release FORCE
1312	$(Q)$(MAKE) $(build)=$(package-dir) $@
1313
1314
1315# Brief documentation of the typical targets used
1316# ---------------------------------------------------------------------------
1317
1318boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1319boards := $(sort $(notdir $(boards)))
1320board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1321board-dirs := $(sort $(notdir $(board-dirs:/=)))
1322
1323PHONY += help
1324help:
1325	@echo  'Cleaning targets:'
1326	@echo  '  clean		  - Remove most generated files but keep the config and'
1327	@echo  '                    enough build support to build external modules'
1328	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1329	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
1330	@echo  ''
1331	@echo  'Configuration targets:'
1332	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1333	@echo  ''
1334	@echo  'Other generic targets:'
1335	@echo  '  all		  - Build all targets marked with [*]'
1336	@echo  '* vmlinux	  - Build the bare kernel'
1337	@echo  '* modules	  - Build all modules'
1338	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1339	@echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1340	@echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1341	@echo  '  dir/            - Build all files in dir and below'
1342	@echo  '  dir/file.[ois]  - Build specified target only'
1343	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1344	@echo  '                    (requires a recent binutils and recent build (System.map))'
1345	@echo  '  dir/file.ko     - Build module including final link'
1346	@echo  '  modules_prepare - Set up for building external modules'
1347	@echo  '  tags/TAGS	  - Generate tags file for editors'
1348	@echo  '  cscope	  - Generate cscope index'
1349	@echo  '  gtags           - Generate GNU GLOBAL index'
1350	@echo  '  kernelrelease	  - Output the release version string (use with make -s)'
1351	@echo  '  kernelversion	  - Output the version stored in Makefile (use with make -s)'
1352	@echo  '  image_name	  - Output the image name (use with make -s)'
1353	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1354	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1355	 echo  ''
1356	@echo  'Static analysers'
1357	@echo  '  checkstack      - Generate a list of stack hogs'
1358	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1359	@echo  '  versioncheck    - Sanity check on version.h usage'
1360	@echo  '  includecheck    - Check for duplicate included header files'
1361	@echo  '  export_report   - List the usages of all exported symbols'
1362	@echo  '  headers_check   - Sanity check on exported headers'
1363	@echo  '  headerdep       - Detect inclusion cycles in headers'
1364	@$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1365	@echo  ''
1366	@echo  'Kernel selftest'
1367	@echo  '  kselftest       - Build and run kernel selftest (run as root)'
1368	@echo  '                    Build, install, and boot kernel before'
1369	@echo  '                    running kselftest on it'
1370	@echo  '  kselftest-clean - Remove all generated kselftest files'
1371	@echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existed'
1372	@echo  '                    .config.'
1373	@echo  ''
1374	@echo  'Kernel packaging:'
1375	@$(MAKE) $(build)=$(package-dir) help
1376	@echo  ''
1377	@echo  'Documentation targets:'
1378	@$(MAKE) -f $(srctree)/Documentation/Makefile.sphinx dochelp
1379	@echo  ''
1380	@$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1381	@echo  ''
1382	@echo  'Architecture specific targets ($(SRCARCH)):'
1383	@$(if $(archhelp),$(archhelp),\
1384		echo '  No architecture specific help defined for $(SRCARCH)')
1385	@echo  ''
1386	@$(if $(boards), \
1387		$(foreach b, $(boards), \
1388		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1389		echo '')
1390	@$(if $(board-dirs), \
1391		$(foreach b, $(board-dirs), \
1392		printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1393		printf "  %-16s - Show all of the above\\n" help-boards; \
1394		echo '')
1395
1396	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1397	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1398	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1399	@echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1400	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1401	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1402	@echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1403	@echo  '		1: warnings which may be relevant and do not occur too often'
1404	@echo  '		2: warnings which occur quite often but may still be relevant'
1405	@echo  '		3: more obscure warnings, can most likely be ignored'
1406	@echo  '		Multiple levels can be combined with W=12 or W=123'
1407	@echo  ''
1408	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
1409	@echo  'For further info see the ./README file'
1410
1411
1412help-board-dirs := $(addprefix help-,$(board-dirs))
1413
1414help-boards: $(help-board-dirs)
1415
1416boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1417
1418$(help-board-dirs): help-%:
1419	@echo  'Architecture specific targets ($(SRCARCH) $*):'
1420	@$(if $(boards-per-dir), \
1421		$(foreach b, $(boards-per-dir), \
1422		printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1423		echo '')
1424
1425
1426# Documentation targets
1427# ---------------------------------------------------------------------------
1428DOC_TARGETS := xmldocs sgmldocs psdocs pdfdocs htmldocs mandocs installmandocs epubdocs cleandocs
1429PHONY += $(DOC_TARGETS)
1430$(DOC_TARGETS): scripts_basic FORCE
1431	$(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1432	$(Q)$(MAKE) $(build)=Documentation -f $(srctree)/Documentation/Makefile.sphinx $@
1433	$(Q)$(MAKE) $(build)=Documentation/DocBook $@
1434
1435else # KBUILD_EXTMOD
1436
1437###
1438# External module support.
1439# When building external modules the kernel used as basis is considered
1440# read-only, and no consistency checks are made and the make
1441# system is not used on the basis kernel. If updates are required
1442# in the basis kernel ordinary make commands (without M=...) must
1443# be used.
1444#
1445# The following are the only valid targets when building external
1446# modules.
1447# make M=dir clean     Delete all automatically generated files
1448# make M=dir modules   Make all modules in specified dir
1449# make M=dir	       Same as 'make M=dir modules'
1450# make M=dir modules_install
1451#                      Install the modules built in the module directory
1452#                      Assumes install directory is already created
1453
1454# We are always building modules
1455KBUILD_MODULES := 1
1456PHONY += crmodverdir
1457crmodverdir:
1458	$(cmd_crmodverdir)
1459
1460PHONY += $(objtree)/Module.symvers
1461$(objtree)/Module.symvers:
1462	@test -e $(objtree)/Module.symvers || ( \
1463	echo; \
1464	echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1465	echo "           is missing; modules will have no dependencies and modversions."; \
1466	echo )
1467
1468module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1469PHONY += $(module-dirs) modules
1470$(module-dirs): crmodverdir $(objtree)/Module.symvers
1471	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1472
1473modules: $(module-dirs)
1474	@$(kecho) '  Building modules, stage 2.';
1475	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1476
1477PHONY += modules_install
1478modules_install: _emodinst_ _emodinst_post
1479
1480install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1481PHONY += _emodinst_
1482_emodinst_:
1483	$(Q)mkdir -p $(MODLIB)/$(install-dir)
1484	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1485
1486PHONY += _emodinst_post
1487_emodinst_post: _emodinst_
1488	$(call cmd,depmod)
1489
1490clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1491
1492PHONY += $(clean-dirs) clean
1493$(clean-dirs):
1494	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1495
1496clean:	rm-dirs := $(MODVERDIR)
1497clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1498
1499PHONY += help
1500help:
1501	@echo  '  Building external modules.'
1502	@echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1503	@echo  ''
1504	@echo  '  modules         - default target, build the module(s)'
1505	@echo  '  modules_install - install the module'
1506	@echo  '  clean           - remove generated files in module directory only'
1507	@echo  ''
1508
1509# Dummies...
1510PHONY += prepare scripts
1511prepare: ;
1512scripts: ;
1513endif # KBUILD_EXTMOD
1514
1515clean: $(clean-dirs)
1516	$(call cmd,rmdirs)
1517	$(call cmd,rmfiles)
1518	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1519		\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1520		-o -name '*.ko.*' \
1521		-o -name '*.dwo'  \
1522		-o -name '*.su'  \
1523		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1524		-o -name '*.symtypes' -o -name 'modules.order' \
1525		-o -name modules.builtin -o -name '.tmp_*.o.*' \
1526		-o -name '*.c.[012]*.*' \
1527		-o -name '*.gcno' \) -type f -print | xargs rm -f
1528
1529# Generate tags for editors
1530# ---------------------------------------------------------------------------
1531quiet_cmd_tags = GEN     $@
1532      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1533
1534tags TAGS cscope gtags: FORCE
1535	$(call cmd,tags)
1536
1537# Scripts to check various things for consistency
1538# ---------------------------------------------------------------------------
1539
1540PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1541
1542includecheck:
1543	find $(srctree)/* $(RCS_FIND_IGNORE) \
1544		-name '*.[hcS]' -type f -print | sort \
1545		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1546
1547versioncheck:
1548	find $(srctree)/* $(RCS_FIND_IGNORE) \
1549		-name '*.[hcS]' -type f -print | sort \
1550		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1551
1552coccicheck:
1553	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1554
1555namespacecheck:
1556	$(PERL) $(srctree)/scripts/namespace.pl
1557
1558export_report:
1559	$(PERL) $(srctree)/scripts/export_report.pl
1560
1561endif #ifeq ($(config-targets),1)
1562endif #ifeq ($(mixed-targets),1)
1563
1564PHONY += checkstack kernelrelease kernelversion image_name
1565
1566# UML needs a little special treatment here.  It wants to use the host
1567# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1568# else wants $(ARCH), including people doing cross-builds, which means
1569# that $(SUBARCH) doesn't work here.
1570ifeq ($(ARCH), um)
1571CHECKSTACK_ARCH := $(SUBARCH)
1572else
1573CHECKSTACK_ARCH := $(ARCH)
1574endif
1575checkstack:
1576	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1577	$(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1578
1579kernelrelease:
1580	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1581
1582kernelversion:
1583	@echo $(KERNELVERSION)
1584
1585image_name:
1586	@echo $(KBUILD_IMAGE)
1587
1588# Clear a bunch of variables before executing the submake
1589tools/: FORCE
1590	$(Q)mkdir -p $(objtree)/tools
1591	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1592
1593tools/%: FORCE
1594	$(Q)mkdir -p $(objtree)/tools
1595	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1596
1597# Single targets
1598# ---------------------------------------------------------------------------
1599# Single targets are compatible with:
1600# - build with mixed source and output
1601# - build with separate output dir 'make O=...'
1602# - external modules
1603#
1604#  target-dir => where to store outputfile
1605#  build-dir  => directory in kernel source tree to use
1606
1607ifeq ($(KBUILD_EXTMOD),)
1608        build-dir  = $(patsubst %/,%,$(dir $@))
1609        target-dir = $(dir $@)
1610else
1611        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1612        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1613        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1614endif
1615
1616%.s: %.c prepare scripts FORCE
1617	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1618%.i: %.c prepare scripts FORCE
1619	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1620%.o: %.c prepare scripts FORCE
1621	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1622%.lst: %.c prepare scripts FORCE
1623	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1624%.s: %.S prepare scripts FORCE
1625	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1626%.o: %.S prepare scripts FORCE
1627	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1628%.symtypes: %.c prepare scripts FORCE
1629	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1630
1631# Modules
1632/: prepare scripts FORCE
1633	$(cmd_crmodverdir)
1634	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1635	$(build)=$(build-dir)
1636# Make sure the latest headers are built for Documentation
1637Documentation/ samples/: headers_install
1638%/: prepare scripts FORCE
1639	$(cmd_crmodverdir)
1640	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1641	$(build)=$(build-dir)
1642%.ko: prepare scripts FORCE
1643	$(cmd_crmodverdir)
1644	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1645	$(build)=$(build-dir) $(@:.ko=.o)
1646	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1647
1648# FIXME Should go into a make.lib or something
1649# ===========================================================================
1650
1651quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1652      cmd_rmdirs = rm -rf $(rm-dirs)
1653
1654quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1655      cmd_rmfiles = rm -f $(rm-files)
1656
1657# Run depmod only if we have System.map and depmod is executable
1658quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1659      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1660                   $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1661
1662# Create temporary dir for module support files
1663# clean it up only when building all modules
1664cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1665                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1666
1667# read all saved command lines
1668
1669targets := $(wildcard $(sort $(targets)))
1670cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1671
1672ifneq ($(cmd_files),)
1673  $(cmd_files): ;	# Do not try to update included dependency files
1674  include $(cmd_files)
1675endif
1676
1677endif	# skip-makefile
1678
1679PHONY += FORCE
1680FORCE:
1681
1682# Declare the contents of the .PHONY variable as phony.  We keep that
1683# information in a variable so we can use it in if_changed and friends.
1684.PHONY: $(PHONY)
1685