xref: /openbmc/linux/Makefile (revision 23febe375d94d55927019467b6ac5fd503d83b2d)
1b2441318SGreg Kroah-Hartman# SPDX-License-Identifier: GPL-2.0
2bfeffd15SLinus TorvaldsVERSION = 5
38f3d9f35SLinus TorvaldsPATCHLEVEL = 7
455922c9dSLinus TorvaldsSUBLEVEL = 0
52ef96a5bSLinus TorvaldsEXTRAVERSION = -rc5
6d6d5df1dSLinus TorvaldsNAME = Kleptomaniac Octopus
71da177e4SLinus Torvalds
81da177e4SLinus Torvalds# *DOCUMENTATION*
91da177e4SLinus Torvalds# To see a list of typical targets execute "make help"
101da177e4SLinus Torvalds# More info can be located in ./README
111da177e4SLinus Torvalds# Comments in this file are targeted only to the developer, do not
121da177e4SLinus Torvalds# expect to learn how to build the kernel reading this file.
131da177e4SLinus Torvalds
14121c2a13SMasahiro Yamada$(if $(filter __%, $(MAKECMDGOALS)), \
15121c2a13SMasahiro Yamada	$(error targets prefixed with '__' are only for internal use))
16121c2a13SMasahiro Yamada
17ba634eceSMasahiro Yamada# That's our default target when none is given on the command line
18121c2a13SMasahiro YamadaPHONY := __all
19121c2a13SMasahiro Yamada__all:
20ba634eceSMasahiro Yamada
211da177e4SLinus Torvalds# We are using a recursive build, so we need to do a little thinking
221da177e4SLinus Torvalds# to get the ordering right.
231da177e4SLinus Torvalds#
241da177e4SLinus Torvalds# Most importantly: sub-Makefiles should only ever modify files in
251da177e4SLinus Torvalds# their own directory. If in some directory we have a dependency on
261da177e4SLinus Torvalds# a file in another dir (which doesn't happen often, but it's often
27f49821eeSNicholas Piggin# unavoidable when linking the built-in.a targets which finally
281da177e4SLinus Torvalds# turn into vmlinux), we will call a sub make in that other dir, and
291da177e4SLinus Torvalds# after that we are sure that everything which is in that other dir
301da177e4SLinus Torvalds# is now up to date.
311da177e4SLinus Torvalds#
321da177e4SLinus Torvalds# The only cases where we need to modify files which have global
331da177e4SLinus Torvalds# effects are thus separated out and done before the recursive
341da177e4SLinus Torvalds# descending is started. They are now explicitly listed as the
351da177e4SLinus Torvalds# prepare rule.
361da177e4SLinus Torvalds
37221cc2d2SMasahiro Yamadaifneq ($(sub_make_done),1)
383812b8c5SMasahiro Yamada
393812b8c5SMasahiro Yamada# Do not use make's built-in rules and variables
403812b8c5SMasahiro Yamada# (this increases performance and avoids hard-to-debug behaviour)
413812b8c5SMasahiro YamadaMAKEFLAGS += -rR
423812b8c5SMasahiro Yamada
433812b8c5SMasahiro Yamada# Avoid funny character set dependencies
443812b8c5SMasahiro Yamadaunexport LC_ALL
453812b8c5SMasahiro YamadaLC_COLLATE=C
463812b8c5SMasahiro YamadaLC_NUMERIC=C
473812b8c5SMasahiro Yamadaexport LC_COLLATE LC_NUMERIC
483812b8c5SMasahiro Yamada
493812b8c5SMasahiro Yamada# Avoid interference with shell env settings
503812b8c5SMasahiro Yamadaunexport GREP_OPTIONS
513812b8c5SMasahiro Yamada
52066b7ed9SMichal Marek# Beautify output
53066b7ed9SMichal Marek# ---------------------------------------------------------------------------
54066b7ed9SMichal Marek#
55066b7ed9SMichal Marek# Normally, we echo the whole command before executing it. By making
56066b7ed9SMichal Marek# that echo $($(quiet)$(cmd)), we now have the possibility to set
57066b7ed9SMichal Marek# $(quiet) to choose other forms of output instead, e.g.
58066b7ed9SMichal Marek#
59066b7ed9SMichal Marek#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
60066b7ed9SMichal Marek#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
61066b7ed9SMichal Marek#
62066b7ed9SMichal Marek# If $(quiet) is empty, the whole command will be printed.
63066b7ed9SMichal Marek# If it is set to "quiet_", only the short version will be printed.
64066b7ed9SMichal Marek# If it is set to "silent_", nothing will be printed at all, since
65066b7ed9SMichal Marek# the variable $(silent_cmd_cc_o_c) doesn't exist.
66066b7ed9SMichal Marek#
67066b7ed9SMichal Marek# A simple variant is to prefix commands with $(Q) - that's useful
68066b7ed9SMichal Marek# for commands that shall be hidden in non-verbose mode.
69066b7ed9SMichal Marek#
70066b7ed9SMichal Marek#	$(Q)ln $@ :<
71066b7ed9SMichal Marek#
72066b7ed9SMichal Marek# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
73066b7ed9SMichal Marek# If KBUILD_VERBOSE equals 1 then the above command is displayed.
74505b12b3SRandy Dunlap# If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
75066b7ed9SMichal Marek#
761da177e4SLinus Torvalds# To put more focus on warnings, be less verbose as default
771da177e4SLinus Torvalds# Use 'make V=1' to see the full commands
781da177e4SLinus Torvalds
791da177e4SLinus Torvaldsifeq ("$(origin V)", "command line")
801da177e4SLinus Torvalds  KBUILD_VERBOSE = $(V)
811da177e4SLinus Torvaldsendif
821da177e4SLinus Torvaldsifndef KBUILD_VERBOSE
831da177e4SLinus Torvalds  KBUILD_VERBOSE = 0
841da177e4SLinus Torvaldsendif
851da177e4SLinus Torvalds
86066b7ed9SMichal Marekifeq ($(KBUILD_VERBOSE),1)
87066b7ed9SMichal Marek  quiet =
88066b7ed9SMichal Marek  Q =
89066b7ed9SMichal Marekelse
90066b7ed9SMichal Marek  quiet=quiet_
91066b7ed9SMichal Marek  Q = @
92066b7ed9SMichal Marekendif
93066b7ed9SMichal Marek
94066b7ed9SMichal Marek# If the user is running make -s (silent mode), suppress echoing of
95066b7ed9SMichal Marek# commands
96066b7ed9SMichal Marek
976f0fa58eSMasahiro Yamadaifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
98066b7ed9SMichal Marek  quiet=silent_
99066b7ed9SMichal Marekendif
100066b7ed9SMichal Marek
101066b7ed9SMichal Marekexport quiet Q KBUILD_VERBOSE
102066b7ed9SMichal Marek
10325b146c5SMasahiro Yamada# Kbuild will save output files in the current working directory.
10425b146c5SMasahiro Yamada# This does not need to match to the root of the kernel source tree.
10525b146c5SMasahiro Yamada#
10625b146c5SMasahiro Yamada# For example, you can do this:
10725b146c5SMasahiro Yamada#
10825b146c5SMasahiro Yamada#  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
10925b146c5SMasahiro Yamada#
11025b146c5SMasahiro Yamada# If you want to save output files in a different location, there are
11125b146c5SMasahiro Yamada# two syntaxes to specify it.
11225b146c5SMasahiro Yamada#
1131da177e4SLinus Torvalds# 1) O=
1141da177e4SLinus Torvalds# Use "make O=dir/to/store/output/files/"
1151da177e4SLinus Torvalds#
1161da177e4SLinus Torvalds# 2) Set KBUILD_OUTPUT
11725b146c5SMasahiro Yamada# Set the environment variable KBUILD_OUTPUT to point to the output directory.
11825b146c5SMasahiro Yamada# export KBUILD_OUTPUT=dir/to/store/output/files/; make
1191da177e4SLinus Torvalds#
1201da177e4SLinus Torvalds# The O= assignment takes precedence over the KBUILD_OUTPUT environment
1211da177e4SLinus Torvalds# variable.
1221da177e4SLinus Torvalds
12325b146c5SMasahiro Yamada# Do we want to change the working directory?
1241da177e4SLinus Torvaldsifeq ("$(origin O)", "command line")
1251da177e4SLinus Torvalds  KBUILD_OUTPUT := $(O)
1261da177e4SLinus Torvaldsendif
1271da177e4SLinus Torvalds
12825b146c5SMasahiro Yamadaifneq ($(KBUILD_OUTPUT),)
12925b146c5SMasahiro Yamada# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
13025b146c5SMasahiro Yamada# expand a shell special character '~'. We use a somewhat tedious way here.
13125b146c5SMasahiro Yamadaabs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
13225b146c5SMasahiro Yamada$(if $(abs_objtree),, \
13325b146c5SMasahiro Yamada     $(error failed to create output directory "$(KBUILD_OUTPUT)"))
13425b146c5SMasahiro Yamada
13525b146c5SMasahiro Yamada# $(realpath ...) resolves symlinks
13625b146c5SMasahiro Yamadaabs_objtree := $(realpath $(abs_objtree))
13725b146c5SMasahiro Yamadaelse
13825b146c5SMasahiro Yamadaabs_objtree := $(CURDIR)
13925b146c5SMasahiro Yamadaendif # ifneq ($(KBUILD_OUTPUT),)
14025b146c5SMasahiro Yamada
14125b146c5SMasahiro Yamadaifeq ($(abs_objtree),$(CURDIR))
14225b146c5SMasahiro Yamada# Suppress "Entering directory ..." unless we are changing the work directory.
14325b146c5SMasahiro YamadaMAKEFLAGS += --no-print-directory
14425b146c5SMasahiro Yamadaelse
14525b146c5SMasahiro Yamadaneed-sub-make := 1
14651193b76SRobert Jarzmikendif
14751193b76SRobert Jarzmik
14825b146c5SMasahiro Yamadaabs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
1491da177e4SLinus Torvalds
15025b146c5SMasahiro Yamadaifneq ($(words $(subst :, ,$(abs_srctree))), 1)
15125b146c5SMasahiro Yamada$(error source directory cannot contain spaces or colons)
15225b146c5SMasahiro Yamadaendif
15325b146c5SMasahiro Yamada
15425b146c5SMasahiro Yamadaifneq ($(abs_srctree),$(abs_objtree))
15580463f1bSMasahiro Yamada# Look for make include files relative to root of kernel src
15680463f1bSMasahiro Yamada#
15780463f1bSMasahiro Yamada# This does not become effective immediately because MAKEFLAGS is re-parsed
15825b146c5SMasahiro Yamada# once after the Makefile is read. We need to invoke sub-make.
15925b146c5SMasahiro YamadaMAKEFLAGS += --include-dir=$(abs_srctree)
160688931a5SMasahiro Yamadaneed-sub-make := 1
16125b146c5SMasahiro Yamadaendif
1623812b8c5SMasahiro Yamada
16393fdddfeSMasahiro Yamadathis-makefile := $(lastword $(MAKEFILE_LIST))
16493fdddfeSMasahiro Yamada
165688931a5SMasahiro Yamadaifneq ($(filter 3.%,$(MAKE_VERSION)),)
166688931a5SMasahiro Yamada# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
167688931a5SMasahiro Yamada# We need to invoke sub-make to avoid implicit rules in the top Makefile.
168688931a5SMasahiro Yamadaneed-sub-make := 1
169688931a5SMasahiro Yamada# Cancel implicit rules for this Makefile.
17093fdddfeSMasahiro Yamada$(this-makefile): ;
171688931a5SMasahiro Yamadaendif
172688931a5SMasahiro Yamada
17325b146c5SMasahiro Yamadaexport abs_srctree abs_objtree
174221cc2d2SMasahiro Yamadaexport sub_make_done := 1
175221cc2d2SMasahiro Yamada
176688931a5SMasahiro Yamadaifeq ($(need-sub-make),1)
177688931a5SMasahiro Yamada
178121c2a13SMasahiro YamadaPHONY += $(MAKECMDGOALS) __sub-make
1790b35786dSMilton Miller
180121c2a13SMasahiro Yamada$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
18116f89098SCharles Keepax	@:
1820b35786dSMilton Miller
183c4e6fff1SCao jin# Invoke a second make in the output directory, passing relevant variables
184121c2a13SMasahiro Yamada__sub-make:
18525b146c5SMasahiro Yamada	$(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
1861da177e4SLinus Torvalds
187688931a5SMasahiro Yamadaendif # need-sub-make
188221cc2d2SMasahiro Yamadaendif # sub_make_done
189688931a5SMasahiro Yamada
1901da177e4SLinus Torvalds# We process the rest of the Makefile if this is the final invocation of make
191688931a5SMasahiro Yamadaifeq ($(need-sub-make),)
1921da177e4SLinus Torvalds
1937ff52571SMasahiro Yamada# Do not print "Entering directory ...",
1947ff52571SMasahiro Yamada# but we want to display it when entering to the output directory
1957ff52571SMasahiro Yamada# so that IDEs/editors are able to understand relative filenames.
1967ff52571SMasahiro YamadaMAKEFLAGS += --no-print-directory
1977ff52571SMasahiro Yamada
198aa55c8e2SMasahiro Yamada# Call a source code checker (by default, "sparse") as part of the
199aa55c8e2SMasahiro Yamada# C compilation.
200aa55c8e2SMasahiro Yamada#
201aa55c8e2SMasahiro Yamada# Use 'make C=1' to enable checking of only re-compiled files.
202aa55c8e2SMasahiro Yamada# Use 'make C=2' to enable checking of *all* source files, regardless
203aa55c8e2SMasahiro Yamada# of whether they are re-compiled or not.
204aa55c8e2SMasahiro Yamada#
205036db11cSCao jin# See the file "Documentation/dev-tools/sparse.rst" for more details,
206036db11cSCao jin# including where to get the "sparse" utility.
207aa55c8e2SMasahiro Yamada
208aa55c8e2SMasahiro Yamadaifeq ("$(origin C)", "command line")
209aa55c8e2SMasahiro Yamada  KBUILD_CHECKSRC = $(C)
210aa55c8e2SMasahiro Yamadaendif
211aa55c8e2SMasahiro Yamadaifndef KBUILD_CHECKSRC
212aa55c8e2SMasahiro Yamada  KBUILD_CHECKSRC = 0
213aa55c8e2SMasahiro Yamadaendif
214aa55c8e2SMasahiro Yamada
2157e35b425SMasahiro Yamada# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
2167e35b425SMasahiro Yamada# directory of external module to build. Setting M= takes precedence.
217aa55c8e2SMasahiro Yamadaifeq ("$(origin M)", "command line")
218aa55c8e2SMasahiro Yamada  KBUILD_EXTMOD := $(M)
219aa55c8e2SMasahiro Yamadaendif
220aa55c8e2SMasahiro Yamada
221e9e81b63SMasahiro Yamada$(if $(word 2, $(KBUILD_EXTMOD)), \
222e9e81b63SMasahiro Yamada	$(error building multiple external modules is not supported))
223e9e81b63SMasahiro Yamada
224051f278eSMasahiro Yamadaexport KBUILD_CHECKSRC KBUILD_EXTMOD
225051f278eSMasahiro Yamada
226394053f4SMasahiro Yamadaextmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
227394053f4SMasahiro Yamada
22825b146c5SMasahiro Yamadaifeq ($(abs_srctree),$(abs_objtree))
2299da0763bSMichal Marek        # building in the source tree
2309da0763bSMichal Marek        srctree := .
231051f278eSMasahiro Yamada	building_out_of_srctree :=
2329da0763bSMichal Marekelse
23325b146c5SMasahiro Yamada        ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
2349da0763bSMichal Marek                # building in a subdirectory of the source tree
2359da0763bSMichal Marek                srctree := ..
2369da0763bSMichal Marek        else
23725b146c5SMasahiro Yamada                srctree := $(abs_srctree)
2389da0763bSMichal Marek        endif
239051f278eSMasahiro Yamada	building_out_of_srctree := 1
2409da0763bSMichal Marekendif
2412c1f4f12SMasahiro Yamada
24295fd3f87SMasahiro Yamadaifneq ($(KBUILD_ABS_SRCTREE),)
24395fd3f87SMasahiro Yamadasrctree := $(abs_srctree)
24495fd3f87SMasahiro Yamadaendif
2452c1f4f12SMasahiro Yamada
2467e1c0477SMichal Marekobjtree		:= .
2476b12de69SMasahiro YamadaVPATH		:= $(srctree)
2481da177e4SLinus Torvalds
249051f278eSMasahiro Yamadaexport building_out_of_srctree srctree objtree VPATH
2501da177e4SLinus Torvalds
2512c1f4f12SMasahiro Yamada# To make sure we do not include .config for any of the *config targets
2522c1f4f12SMasahiro Yamada# catch them early, and hand them over to scripts/kconfig/Makefile
2532c1f4f12SMasahiro Yamada# It is allowed to specify more targets when calling make, including
2542c1f4f12SMasahiro Yamada# mixing *config targets and build targets.
2552c1f4f12SMasahiro Yamada# For example 'make oldconfig all'.
2562c1f4f12SMasahiro Yamada# Detect when mixed targets is specified, and make a second invocation
2572c1f4f12SMasahiro Yamada# of make so .config is not included in this case either (for *config).
2582c1f4f12SMasahiro Yamada
2592c1f4f12SMasahiro Yamadaversion_h := include/generated/uapi/linux/version.h
2602c1f4f12SMasahiro Yamadaold_version_h := include/linux/version.h
2612c1f4f12SMasahiro Yamada
26222340a06SMasahiro Yamadaclean-targets := %clean mrproper cleandocs
26322340a06SMasahiro Yamadano-dot-config-targets := $(clean-targets) \
2642c1f4f12SMasahiro Yamada			 cscope gtags TAGS tags help% %docs check% coccicheck \
26559b2bd05SMasahiro Yamada			 $(version_h) headers headers_% archheaders archscripts \
2664623980dSDavid Engraf			 %asm-generic kernelversion %src-pkg dt_binding_check \
2674623980dSDavid Engraf			 outputmakefile
268a29d4d8cSMasahiro Yamadano-sync-config-targets := $(no-dot-config-targets) install %install \
269a29d4d8cSMasahiro Yamada			   kernelrelease
270394053f4SMasahiro Yamadasingle-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
2712c1f4f12SMasahiro Yamada
2722042b548SMasahiro Yamadaconfig-build	:=
2732042b548SMasahiro Yamadamixed-build	:=
2742042b548SMasahiro Yamadaneed-config	:= 1
275d7942413SMasahiro Yamadamay-sync-config	:= 1
276394053f4SMasahiro Yamadasingle-build	:=
2772c1f4f12SMasahiro Yamada
2782c1f4f12SMasahiro Yamadaifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
2792c1f4f12SMasahiro Yamada	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
2802042b548SMasahiro Yamada		need-config :=
2812c1f4f12SMasahiro Yamada	endif
2822c1f4f12SMasahiro Yamadaendif
2832c1f4f12SMasahiro Yamada
284d7942413SMasahiro Yamadaifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
285d7942413SMasahiro Yamada	ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
2862042b548SMasahiro Yamada		may-sync-config :=
287d7942413SMasahiro Yamada	endif
288d7942413SMasahiro Yamadaendif
289d7942413SMasahiro Yamada
290d7942413SMasahiro Yamadaifneq ($(KBUILD_EXTMOD),)
2912042b548SMasahiro Yamada	may-sync-config :=
292d7942413SMasahiro Yamadaendif
293d7942413SMasahiro Yamada
2942c1f4f12SMasahiro Yamadaifeq ($(KBUILD_EXTMOD),)
2952c1f4f12SMasahiro Yamada        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
2962042b548SMasahiro Yamada		config-build := 1
2972c1f4f12SMasahiro Yamada                ifneq ($(words $(MAKECMDGOALS)),1)
2982042b548SMasahiro Yamada			mixed-build := 1
2992c1f4f12SMasahiro Yamada                endif
3002c1f4f12SMasahiro Yamada        endif
3012c1f4f12SMasahiro Yamadaendif
30222340a06SMasahiro Yamada
303394053f4SMasahiro Yamada# We cannot build single targets and the others at the same time
304394053f4SMasahiro Yamadaifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
305394053f4SMasahiro Yamada	single-build := 1
306394053f4SMasahiro Yamada	ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
307394053f4SMasahiro Yamada		mixed-build := 1
308394053f4SMasahiro Yamada	endif
309394053f4SMasahiro Yamadaendif
310394053f4SMasahiro Yamada
31122340a06SMasahiro Yamada# For "make -j clean all", "make -j mrproper defconfig all", etc.
31222340a06SMasahiro Yamadaifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
31322340a06SMasahiro Yamada        ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
3142042b548SMasahiro Yamada		mixed-build := 1
31522340a06SMasahiro Yamada        endif
31622340a06SMasahiro Yamadaendif
31722340a06SMasahiro Yamada
3182c1f4f12SMasahiro Yamada# install and modules_install need also be processed one by one
3192c1f4f12SMasahiro Yamadaifneq ($(filter install,$(MAKECMDGOALS)),)
3202c1f4f12SMasahiro Yamada        ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
3212042b548SMasahiro Yamada		mixed-build := 1
3222c1f4f12SMasahiro Yamada        endif
3232c1f4f12SMasahiro Yamadaendif
3242c1f4f12SMasahiro Yamada
3252042b548SMasahiro Yamadaifdef mixed-build
3262c1f4f12SMasahiro Yamada# ===========================================================================
3272c1f4f12SMasahiro Yamada# We're called with mixed targets (*config and build targets).
3282c1f4f12SMasahiro Yamada# Handle them one by one.
3292c1f4f12SMasahiro Yamada
3302c1f4f12SMasahiro YamadaPHONY += $(MAKECMDGOALS) __build_one_by_one
3312c1f4f12SMasahiro Yamada
332121c2a13SMasahiro Yamada$(MAKECMDGOALS): __build_one_by_one
3332c1f4f12SMasahiro Yamada	@:
3342c1f4f12SMasahiro Yamada
3352c1f4f12SMasahiro Yamada__build_one_by_one:
3362c1f4f12SMasahiro Yamada	$(Q)set -e; \
3372c1f4f12SMasahiro Yamada	for i in $(MAKECMDGOALS); do \
3382c1f4f12SMasahiro Yamada		$(MAKE) -f $(srctree)/Makefile $$i; \
3392c1f4f12SMasahiro Yamada	done
3402c1f4f12SMasahiro Yamada
3412042b548SMasahiro Yamadaelse # !mixed-build
3422c1f4f12SMasahiro Yamada
3432c1f4f12SMasahiro Yamadainclude scripts/Kbuild.include
3442c1f4f12SMasahiro Yamada
3452c1f4f12SMasahiro Yamada# Read KERNELRELEASE from include/config/kernel.release (if it exists)
3462c1f4f12SMasahiro YamadaKERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
3472c1f4f12SMasahiro YamadaKERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
3482c1f4f12SMasahiro Yamadaexport VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
3492c1f4f12SMasahiro Yamada
350b2d35fa5SAnders Roxellinclude scripts/subarch.include
3511da177e4SLinus Torvalds
3521da177e4SLinus Torvalds# Cross compiling and selecting different set of gcc/bin-utils
3531da177e4SLinus Torvalds# ---------------------------------------------------------------------------
3541da177e4SLinus Torvalds#
3551da177e4SLinus Torvalds# When performing cross compilation for other architectures ARCH shall be set
3561da177e4SLinus Torvalds# to the target architecture. (See arch/* for the possibilities).
3571da177e4SLinus Torvalds# ARCH can be set during invocation of make:
3581da177e4SLinus Torvalds# make ARCH=ia64
3591da177e4SLinus Torvalds# Another way is to have ARCH set in the environment.
3601da177e4SLinus Torvalds# The default ARCH is the host where make is executed.
3611da177e4SLinus Torvalds
3621da177e4SLinus Torvalds# CROSS_COMPILE specify the prefix used for all executables used
3631da177e4SLinus Torvalds# during compilation. Only gcc and related bin-utils executables
3641da177e4SLinus Torvalds# are prefixed with $(CROSS_COMPILE).
3651da177e4SLinus Torvalds# CROSS_COMPILE can be set on the command line
3661da177e4SLinus Torvalds# make CROSS_COMPILE=ia64-linux-
3671da177e4SLinus Torvalds# Alternatively CROSS_COMPILE can be set in the environment.
3681da177e4SLinus Torvalds# Default value for CROSS_COMPILE is not to prefix executables
3691da177e4SLinus Torvalds# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
3702331d1a6SSam RavnborgARCH		?= $(SUBARCH)
3711da177e4SLinus Torvalds
3721da177e4SLinus Torvalds# Architecture as present in compile.h
3731da177e4SLinus TorvaldsUTS_MACHINE 	:= $(ARCH)
3746752ed90SThomas GleixnerSRCARCH 	:= $(ARCH)
3751da177e4SLinus Torvalds
376d746d647SSam Ravnborg# Additional ARCH settings for x86
377d746d647SSam Ravnborgifeq ($(ARCH),i386)
378d746d647SSam Ravnborg        SRCARCH := x86
379d746d647SSam Ravnborgendif
380d746d647SSam Ravnborgifeq ($(ARCH),x86_64)
381d746d647SSam Ravnborg        SRCARCH := x86
382d746d647SSam Ravnborgendif
38374b469f2SSam Ravnborg
3845e538790SSam Ravnborg# Additional ARCH settings for sparc
385e69f58c0SNamhyung Kimifeq ($(ARCH),sparc32)
386e69f58c0SNamhyung Kim       SRCARCH := sparc
387e69f58c0SNamhyung Kimendif
388a439fe51SSam Ravnborgifeq ($(ARCH),sparc64)
3895e538790SSam Ravnborg       SRCARCH := sparc
390a439fe51SSam Ravnborgendif
3912fb9b1bdSSam Ravnborg
3923cc000b5SPaul Mundt# Additional ARCH settings for sh
3933cc000b5SPaul Mundtifeq ($(ARCH),sh64)
3943cc000b5SPaul Mundt       SRCARCH := sh
3953cc000b5SPaul Mundtendif
3963cc000b5SPaul Mundt
39714cdd3c4SRoman ZippelKCONFIG_CONFIG	?= .config
39841263fc6SBen Gardinerexport KCONFIG_CONFIG
39914cdd3c4SRoman Zippel
4002a86f661SMasahiro Yamada# Default file for 'make defconfig'. This may be overridden by arch-Makefile.
4012a86f661SMasahiro Yamadaexport KBUILD_DEFCONFIG := defconfig
4022a86f661SMasahiro Yamada
4031da177e4SLinus Torvalds# SHELL used by kbuild
404858805b3SMasahiro YamadaCONFIG_SHELL := sh
4051da177e4SLinus Torvalds
4066d79a7b4SMasahiro YamadaHOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
4076d79a7b4SMasahiro YamadaHOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
4086d79a7b4SMasahiro YamadaHOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
409d7f14c66SUwe Kleine-König
410a0d1c951SMasahiro Yamadaifneq ($(LLVM),)
411a0d1c951SMasahiro YamadaHOSTCC	= clang
412a0d1c951SMasahiro YamadaHOSTCXX	= clang++
413a0d1c951SMasahiro Yamadaelse
4141da177e4SLinus TorvaldsHOSTCC	= gcc
4151da177e4SLinus TorvaldsHOSTCXX	= g++
416a0d1c951SMasahiro Yamadaendif
4177f3a59dbSMasahiro Yamada
4187f3a59dbSMasahiro Yamadaexport KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
4197f3a59dbSMasahiro Yamada			      -O2 -fomit-frame-pointer -std=gnu89
4207f3a59dbSMasahiro Yamadaexport KBUILD_USERLDFLAGS :=
4217f3a59dbSMasahiro Yamada
4227f3a59dbSMasahiro YamadaKBUILD_HOSTCFLAGS   := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
423735aab1eSMasahiro YamadaKBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
424f92d19e0SLaura AbbottKBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
425f92d19e0SLaura AbbottKBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
4261da177e4SLinus Torvalds
4271da177e4SLinus Torvalds# Make variables (CC, etc...)
4281da177e4SLinus TorvaldsCPP		= $(CC) -E
429a0d1c951SMasahiro Yamadaifneq ($(LLVM),)
430a0d1c951SMasahiro YamadaCC		= clang
431a0d1c951SMasahiro YamadaLD		= ld.lld
432a0d1c951SMasahiro YamadaAR		= llvm-ar
433a0d1c951SMasahiro YamadaNM		= llvm-nm
434a0d1c951SMasahiro YamadaOBJCOPY		= llvm-objcopy
435a0d1c951SMasahiro YamadaOBJDUMP		= llvm-objdump
436a0d1c951SMasahiro YamadaREADELF		= llvm-readelf
437a0d1c951SMasahiro YamadaOBJSIZE		= llvm-size
438a0d1c951SMasahiro YamadaSTRIP		= llvm-strip
439a0d1c951SMasahiro Yamadaelse
440a0d1c951SMasahiro YamadaCC		= $(CROSS_COMPILE)gcc
441a0d1c951SMasahiro YamadaLD		= $(CROSS_COMPILE)ld
4421da177e4SLinus TorvaldsAR		= $(CROSS_COMPILE)ar
4431da177e4SLinus TorvaldsNM		= $(CROSS_COMPILE)nm
4441da177e4SLinus TorvaldsOBJCOPY		= $(CROSS_COMPILE)objcopy
4451da177e4SLinus TorvaldsOBJDUMP		= $(CROSS_COMPILE)objdump
446eefb8c12SDmitry GolovinREADELF		= $(CROSS_COMPILE)readelf
447a0d1c951SMasahiro YamadaOBJSIZE		= $(CROSS_COMPILE)size
448a0d1c951SMasahiro YamadaSTRIP		= $(CROSS_COMPILE)strip
449a0d1c951SMasahiro Yamadaendif
450e83b9f55SAndrii NakryikoPAHOLE		= pahole
45173a4f6dbSMasahiro YamadaLEX		= flex
45273a4f6dbSMasahiro YamadaYACC		= bison
4531da177e4SLinus TorvaldsAWK		= awk
454caa27b66SSam RavnborgINSTALLKERNEL  := installkernel
4551da177e4SLinus TorvaldsDEPMOD		= /sbin/depmod
4561da177e4SLinus TorvaldsPERL		= perl
457011bf125SMasahiro YamadaPYTHON		= python
458e9781b52SMasahiro YamadaPYTHON3		= python3
4591da177e4SLinus TorvaldsCHECK		= sparse
460858805b3SMasahiro YamadaBASH		= bash
4611da177e4SLinus Torvalds
46280a7d1d9SHannes EderCHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
4636c49f359SLuc Van Oostenryck		  -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
4640c22be07SDouglas AndersonNOSTDINC_FLAGS :=
4656588169dSSam RavnborgCFLAGS_MODULE   =
4666588169dSSam RavnborgAFLAGS_MODULE   =
4676588169dSSam RavnborgLDFLAGS_MODULE  =
4681da177e4SLinus TorvaldsCFLAGS_KERNEL	=
4691da177e4SLinus TorvaldsAFLAGS_KERNEL	=
470b36fad65SMichal MarekLDFLAGS_vmlinux =
4711da177e4SLinus Torvalds
472abbf1590SDavid Howells# Use USERINCLUDE when you must reference the UAPI directories only.
473abbf1590SDavid HowellsUSERINCLUDE    := \
4749d022c54SMasahiro Yamada		-I$(srctree)/arch/$(SRCARCH)/include/uapi \
4759d022c54SMasahiro Yamada		-I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
476abbf1590SDavid Howells		-I$(srctree)/include/uapi \
4773308b285SArnd Bergmann		-I$(objtree)/include/generated/uapi \
478abbf1590SDavid Howells                -include $(srctree)/include/linux/kconfig.h
479abbf1590SDavid Howells
4801da177e4SLinus Torvalds# Use LINUXINCLUDE when you must reference the include/ directory.
4811da177e4SLinus Torvalds# Needed to be compatible with the O= option
482abbf1590SDavid HowellsLINUXINCLUDE    := \
4839d022c54SMasahiro Yamada		-I$(srctree)/arch/$(SRCARCH)/include \
4849d022c54SMasahiro Yamada		-I$(objtree)/arch/$(SRCARCH)/include/generated \
485051f278eSMasahiro Yamada		$(if $(building_out_of_srctree),-I$(srctree)/include) \
486f8224f7fSMasahiro Yamada		-I$(objtree)/include \
487f8224f7fSMasahiro Yamada		$(USERINCLUDE)
4881da177e4SLinus Torvalds
48942a92bccSMasahiro YamadaKBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
490eeb5687aSMasahiro YamadaKBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
49142a92bccSMasahiro Yamada		   -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
492b89f25eaSLuc Van Oostenryck		   -Werror=implicit-function-declaration -Werror=implicit-int \
49351b97e35SKirill A. Shutemov		   -Wno-format-security \
494433dc2ebSMasahiro Yamada		   -std=gnu89
495433dc2ebSMasahiro YamadaKBUILD_CPPFLAGS := -D__KERNEL__
49680c00ba9SSam RavnborgKBUILD_AFLAGS_KERNEL :=
49780c00ba9SSam RavnborgKBUILD_CFLAGS_KERNEL :=
4986588169dSSam RavnborgKBUILD_AFLAGS_MODULE  := -DMODULE
4996588169dSSam RavnborgKBUILD_CFLAGS_MODULE  := -DMODULE
50010df0638SMasahiro YamadaKBUILD_LDFLAGS_MODULE :=
50110df0638SMasahiro Yamadaexport KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds
502d503ac53SMasahiro YamadaKBUILD_LDFLAGS :=
503433dc2ebSMasahiro YamadaGCC_PLUGINS_CFLAGS :=
5045241ab4cSMasahiro YamadaCLANG_FLAGS :=
5051da177e4SLinus Torvalds
506aa824e0cSMasahiro Yamadaexport ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
507eefb8c12SDmitry Golovinexport CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE LEX YACC AWK INSTALLKERNEL
50894f7345bSMasahiro Yamadaexport PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
5097bac9870SVasily Gorbikexport KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
5101da177e4SLinus Torvalds
511d503ac53SMasahiro Yamadaexport KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
5120e410e15SAndrey Konovalovexport KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
5130e410e15SAndrey Konovalovexport CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
514222d394dSSam Ravnborgexport KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
5156588169dSSam Ravnborgexport KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
51680c00ba9SSam Ravnborgexport KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
5171da177e4SLinus Torvalds
5181da177e4SLinus Torvalds# Files to ignore in find ... statements
5191da177e4SLinus Torvalds
520ae63b2d7SPrarit Bhargavaexport RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
521ae63b2d7SPrarit Bhargava			  -name CVS -o -name .pc -o -name .hg -o -name .git \) \
522ae63b2d7SPrarit Bhargava			  -prune -o
523450c6076SJesper Juhlexport RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
524450c6076SJesper Juhl			 --exclude CVS --exclude .pc --exclude .hg --exclude .git
5251da177e4SLinus Torvalds
5261da177e4SLinus Torvalds# ===========================================================================
5271da177e4SLinus Torvalds# Rules shared between *config targets and build targets
5281da177e4SLinus Torvalds
529312a3d09SCao jin# Basic helpers built in scripts/basic/
5304f193362SPaul SmithPHONY += scripts_basic
5311da177e4SLinus Torvaldsscripts_basic:
5321da177e4SLinus Torvalds	$(Q)$(MAKE) $(build)=scripts/basic
533638adb05SSteven Rostedt	$(Q)rm -f .tmp_quiet_recordmcount
5341da177e4SLinus Torvalds
5354f193362SPaul SmithPHONY += outputmakefile
536e8e83a23SMasahiro Yamada# Before starting out-of-tree build, make sure the source tree is clean.
537fd5f0cd6SJan Beulich# outputmakefile generates a Makefile in the output directory, if using a
538fd5f0cd6SJan Beulich# separate output directory. This allows convenient use of make in the
539fd5f0cd6SJan Beulich# output directory.
5403a51ff34SVladimir Kondratiev# At the same time when output Makefile generated, generate .gitignore to
5413a51ff34SVladimir Kondratiev# ignore whole output directory
5421da177e4SLinus Torvaldsoutputmakefile:
543051f278eSMasahiro Yamadaifdef building_out_of_srctree
544e8e83a23SMasahiro Yamada	$(Q)if [ -f $(srctree)/.config -o \
545e8e83a23SMasahiro Yamada		 -d $(srctree)/include/config -o \
546e8e83a23SMasahiro Yamada		 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
547e8e83a23SMasahiro Yamada		echo >&2 "***"; \
548e8e83a23SMasahiro Yamada		echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
549e8e83a23SMasahiro Yamada		echo >&2 "*** in $(abs_srctree)";\
550e8e83a23SMasahiro Yamada		echo >&2 "***"; \
551e8e83a23SMasahiro Yamada		false; \
552e8e83a23SMasahiro Yamada	fi
55392979997SAndi Kleen	$(Q)ln -fsn $(srctree) source
5544fd61277SMasahiro Yamada	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
555156e7cbbSMasahiro Yamada	$(Q)test -e .gitignore || \
556156e7cbbSMasahiro Yamada	{ echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
557fd5f0cd6SJan Beulichendif
5581da177e4SLinus Torvalds
55999516742SMasahiro Yamadaifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
560ae6b289aSChris Friesifneq ($(CROSS_COMPILE),)
5615241ab4cSMasahiro YamadaCLANG_FLAGS	+= --target=$(notdir $(CROSS_COMPILE:%-=%))
562ad15006cSNick DesaulniersGCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
563238bcbc4SMasahiro YamadaCLANG_FLAGS	+= --prefix=$(GCC_TOOLCHAIN_DIR)
564ef8c4ed9SStefan AgnerGCC_TOOLCHAIN	:= $(realpath $(GCC_TOOLCHAIN_DIR)/..)
565ae6b289aSChris Friesendif
566ae6b289aSChris Friesifneq ($(GCC_TOOLCHAIN),)
567238bcbc4SMasahiro YamadaCLANG_FLAGS	+= --gcc-toolchain=$(GCC_TOOLCHAIN)
568ae6b289aSChris Friesendif
5697e20e47cSMasahiro Yamadaifneq ($(LLVM_IAS),1)
570238bcbc4SMasahiro YamadaCLANG_FLAGS	+= -no-integrated-as
571876a0600SNathan Chancellorendif
572589834b3SNathan ChancellorCLANG_FLAGS	+= -Werror=unknown-warning-option
573238bcbc4SMasahiro YamadaKBUILD_CFLAGS	+= $(CLANG_FLAGS)
574238bcbc4SMasahiro YamadaKBUILD_AFLAGS	+= $(CLANG_FLAGS)
5753bd98050SJoel Stanleyexport CLANG_FLAGS
576ae6b289aSChris Friesendif
577ae6b289aSChris Fries
578315bab4eSMasahiro Yamada# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
579315bab4eSMasahiro Yamada# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
580315bab4eSMasahiro Yamada# CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
581315bab4eSMasahiro Yamada# and from include/config/auto.conf.cmd to detect the compiler upgrade.
582902a6898SMasahiro YamadaCC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
583315bab4eSMasahiro Yamada
5842042b548SMasahiro Yamadaifdef config-build
5851da177e4SLinus Torvalds# ===========================================================================
5861da177e4SLinus Torvalds# *config targets only - make sure prerequisites are updated, and descend
5871da177e4SLinus Torvalds# in scripts/kconfig to make the *config target
5881da177e4SLinus Torvalds
5891da177e4SLinus Torvalds# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
5901da177e4SLinus Torvalds# KBUILD_DEFCONFIG may point out an alternative default configuration
5911da177e4SLinus Torvalds# used for 'make defconfig'
592a436bb7bSMasahiro Yamadainclude arch/$(SRCARCH)/Makefile
593315bab4eSMasahiro Yamadaexport KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
5941da177e4SLinus Torvalds
59536de077bSMasahiro Yamadaconfig: outputmakefile scripts_basic FORCE
59631110ebbSSam Ravnborg	$(Q)$(MAKE) $(build)=scripts/kconfig $@
59731110ebbSSam Ravnborg
59836de077bSMasahiro Yamada%config: outputmakefile scripts_basic FORCE
5991da177e4SLinus Torvalds	$(Q)$(MAKE) $(build)=scripts/kconfig $@
6001da177e4SLinus Torvalds
6012042b548SMasahiro Yamadaelse #!config-build
6021da177e4SLinus Torvalds# ===========================================================================
6031da177e4SLinus Torvalds# Build targets only - this includes vmlinux, arch specific targets, clean
6041da177e4SLinus Torvalds# targets and others. In general all targets except *config targets.
6051da177e4SLinus Torvalds
6062c1f4f12SMasahiro Yamada# If building an external module we do not care about the all: rule
607121c2a13SMasahiro Yamada# but instead __all depend on modules
6082c1f4f12SMasahiro YamadaPHONY += all
6092c1f4f12SMasahiro Yamadaifeq ($(KBUILD_EXTMOD),)
610121c2a13SMasahiro Yamada__all: all
6112c1f4f12SMasahiro Yamadaelse
612121c2a13SMasahiro Yamada__all: modules
6132c1f4f12SMasahiro Yamadaendif
6142c1f4f12SMasahiro Yamada
6152c1f4f12SMasahiro Yamada# Decide whether to build built-in, modular, or both.
6162c1f4f12SMasahiro Yamada# Normally, just do built-in.
6172c1f4f12SMasahiro Yamada
6182c1f4f12SMasahiro YamadaKBUILD_MODULES :=
6192c1f4f12SMasahiro YamadaKBUILD_BUILTIN := 1
6202c1f4f12SMasahiro Yamada
6212c1f4f12SMasahiro Yamada# If we have only "make modules", don't compile built-in objects.
6222c1f4f12SMasahiro Yamadaifeq ($(MAKECMDGOALS),modules)
6234b50c8c4SMasahiro Yamada  KBUILD_BUILTIN :=
6242c1f4f12SMasahiro Yamadaendif
6252c1f4f12SMasahiro Yamada
6262c1f4f12SMasahiro Yamada# If we have "make <whatever> modules", compile modules
6272c1f4f12SMasahiro Yamada# in addition to whatever we do anyway.
6282c1f4f12SMasahiro Yamada# Just "make" or "make all" shall build modules as well
6292c1f4f12SMasahiro Yamada
630121c2a13SMasahiro Yamadaifneq ($(filter all modules nsdeps,$(MAKECMDGOALS)),)
6312c1f4f12SMasahiro Yamada  KBUILD_MODULES := 1
6322c1f4f12SMasahiro Yamadaendif
6332c1f4f12SMasahiro Yamada
6342c1f4f12SMasahiro Yamadaifeq ($(MAKECMDGOALS),)
6352c1f4f12SMasahiro Yamada  KBUILD_MODULES := 1
6362c1f4f12SMasahiro Yamadaendif
6372c1f4f12SMasahiro Yamada
6382c1f4f12SMasahiro Yamadaexport KBUILD_MODULES KBUILD_BUILTIN
6392c1f4f12SMasahiro Yamada
6402042b548SMasahiro Yamadaifdef need-config
641d93a18f2SMasahiro Yamadainclude include/config/auto.conf
642d93a18f2SMasahiro Yamadaendif
643d93a18f2SMasahiro Yamada
6441da177e4SLinus Torvaldsifeq ($(KBUILD_EXTMOD),)
6451da177e4SLinus Torvalds# Objects we will link into vmlinux / subdirs we need to visit
646*23febe37SMasahiro Yamadacore-y		:= init/ usr/
647f96182e9SMasahiro Yamadadrivers-y	:= drivers/ sound/
648d93a18f2SMasahiro Yamadadrivers-$(CONFIG_SAMPLES) += samples/
6491da177e4SLinus Torvaldsnet-y		:= net/
6501da177e4SLinus Torvaldslibs-y		:= lib/
65137d9fe47SFeng Wuvirt-y		:= virt/
6521da177e4SLinus Torvaldsendif # KBUILD_EXTMOD
6531da177e4SLinus Torvalds
654315bab4eSMasahiro Yamada# The all: target is the default when no target is given on the
655315bab4eSMasahiro Yamada# command line.
656315bab4eSMasahiro Yamada# This allow a user to issue only 'make' to build a kernel including modules
657315bab4eSMasahiro Yamada# Defaults to vmlinux, but the arch makefile usually adds further targets
658315bab4eSMasahiro Yamadaall: vmlinux
659315bab4eSMasahiro Yamada
660315bab4eSMasahiro YamadaCFLAGS_GCOV	:= -fprofile-arcs -ftest-coverage \
661315bab4eSMasahiro Yamada	$(call cc-option,-fno-tree-loop-im) \
662315bab4eSMasahiro Yamada	$(call cc-disable-warning,maybe-uninitialized,)
6635aadfdebSMasahiro Yamadaexport CFLAGS_GCOV
664315bab4eSMasahiro Yamada
665b1f4ff74SPaulo Zanoni# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
666b1f4ff74SPaulo Zanoniifdef CONFIG_FUNCTION_TRACER
667b1f4ff74SPaulo Zanoni  CC_FLAGS_FTRACE := -pg
668b1f4ff74SPaulo Zanoniendif
669b1f4ff74SPaulo Zanoni
670669e06b1SMasahiro YamadaRETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
671669e06b1SMasahiro YamadaRETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
672669e06b1SMasahiro YamadaRETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
673669e06b1SMasahiro YamadaRETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
674669e06b1SMasahiro YamadaRETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
675669e06b1SMasahiro YamadaRETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
676669e06b1SMasahiro Yamadaexport RETPOLINE_CFLAGS
677669e06b1SMasahiro Yamadaexport RETPOLINE_VDSO_CFLAGS
678669e06b1SMasahiro Yamada
679315bab4eSMasahiro Yamadainclude arch/$(SRCARCH)/Makefile
680315bab4eSMasahiro Yamada
6812042b548SMasahiro Yamadaifdef need-config
6822042b548SMasahiro Yamadaifdef may-sync-config
683315bab4eSMasahiro Yamada# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
684315bab4eSMasahiro Yamada# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
685315bab4eSMasahiro Yamada# because some architectures define CROSS_COMPILE there.
686d2f8ae0eSMasahiro Yamadainclude include/config/auto.conf.cmd
6871da177e4SLinus Torvalds
68805850719SMasahiro Yamada$(KCONFIG_CONFIG):
68905850719SMasahiro Yamada	@echo >&2 '***'
69005850719SMasahiro Yamada	@echo >&2 '*** Configuration file "$@" not found!'
69105850719SMasahiro Yamada	@echo >&2 '***'
69205850719SMasahiro Yamada	@echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
69305850719SMasahiro Yamada	@echo >&2 '*** "make menuconfig" or "make xconfig").'
69405850719SMasahiro Yamada	@echo >&2 '***'
69505850719SMasahiro Yamada	@/bin/false
6961da177e4SLinus Torvalds
69761277981SUlf Magnusson# The actual configuration files used during the build are stored in
69861277981SUlf Magnusson# include/generated/ and include/config/. Update them if .config is newer than
69961277981SUlf Magnusson# include/config/auto.conf (which mirrors .config).
7009390dff6SMasahiro Yamada#
7019390dff6SMasahiro Yamada# This exploits the 'multi-target pattern rule' trick.
7029390dff6SMasahiro Yamada# The syncconfig should be executed only once to make all the targets.
703f463c351SMasahiro Yamada# (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
7043044dd05SMasahiro Yamada%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
705911a91c3SMasahiro Yamada	$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
7062042b548SMasahiro Yamadaelse # !may-sync-config
707d7942413SMasahiro Yamada# External modules and some install targets need include/generated/autoconf.h
708d7942413SMasahiro Yamada# and include/config/auto.conf but do not care if they are up-to-date.
709d7942413SMasahiro Yamada# Use auto.conf to trigger the test
7109ee4e336SSam RavnborgPHONY += include/config/auto.conf
7119ee4e336SSam Ravnborg
7129ee4e336SSam Ravnborginclude/config/auto.conf:
713264a2683SSam Ravnborg	$(Q)test -e include/generated/autoconf.h -a -e $@ || (		\
7145369f550SMichal Marek	echo >&2;							\
7155369f550SMichal Marek	echo >&2 "  ERROR: Kernel configuration is invalid.";		\
7165369f550SMichal Marek	echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
7175369f550SMichal Marek	echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";	\
7185369f550SMichal Marek	echo >&2 ;							\
7199ee4e336SSam Ravnborg	/bin/false)
7209ee4e336SSam Ravnborg
721d7942413SMasahiro Yamadaendif # may-sync-config
7222042b548SMasahiro Yamadaendif # need-config
7231da177e4SLinus Torvalds
724a1c48bb1SGeert UytterhoevenKBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
725ef6000b4SLinus TorvaldsKBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
726bd664f6bSLinus TorvaldsKBUILD_CFLAGS	+= $(call cc-disable-warning, format-truncation)
727bd664f6bSLinus TorvaldsKBUILD_CFLAGS	+= $(call cc-disable-warning, format-overflow)
7286f303d60SLinus TorvaldsKBUILD_CFLAGS	+= $(call cc-disable-warning, address-of-packed-member)
729a1c48bb1SGeert Uytterhoeven
73015f5db60SMasahiro Yamadaifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
731a0f97e06SSam RavnborgKBUILD_CFLAGS += -O2
73215f5db60SMasahiro Yamadaelse ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
73315f5db60SMasahiro YamadaKBUILD_CFLAGS += -O3
73415f5db60SMasahiro Yamadaelse ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
73515f5db60SMasahiro YamadaKBUILD_CFLAGS += -Os
7361da177e4SLinus Torvaldsendif
7371da177e4SLinus Torvalds
73869102311SJiri Kosina# Tell gcc to never replace conditional load with a non-conditional one
73969102311SJiri KosinaKBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)
740b1112139SSergei TrofimovichKBUILD_CFLAGS	+= $(call cc-option,-fno-allow-store-data-races)
74169102311SJiri Kosina
742d677a4d6SVictor Chibotaruinclude scripts/Makefile.kcov
7436b90bd4bSEmese Revfyinclude scripts/Makefile.gcc-plugins
7446b90bd4bSEmese Revfy
7451873e870SAndi Kleenifdef CONFIG_READABLE_ASM
7461873e870SAndi Kleen# Disable optimizations that make assembler listings hard to read.
7471873e870SAndi Kleen# reorder blocks reorders the control in the function
7481873e870SAndi Kleen# ipa clone creates specialized cloned functions
7491873e870SAndi Kleen# partial inlining inlines only parts of functions
7501873e870SAndi KleenKBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
7511873e870SAndi Kleen                 $(call cc-option,-fno-ipa-cp-clone,) \
7521873e870SAndi Kleen                 $(call cc-option,-fno-partial-inlining)
7531873e870SAndi Kleenendif
7541873e870SAndi Kleen
75508f67461SMike Frysingerifneq ($(CONFIG_FRAME_WARN),0)
756a83e4ca2SMasahiro YamadaKBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
75735bb5b1eSAndi Kleenendif
75835bb5b1eSAndi Kleen
7592a61f474SMasahiro Yamadastackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
760050e9baaSLinus Torvaldsstackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
761050e9baaSLinus Torvaldsstackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
7622a61f474SMasahiro Yamada
7632a61f474SMasahiro YamadaKBUILD_CFLAGS += $(stackp-flags-y)
764e06b8b98SSam Ravnborg
765076f421dSMasahiro Yamadaifdef CONFIG_CC_IS_CLANG
766a1494304SMasahiro YamadaKBUILD_CPPFLAGS += -Qunused-arguments
767a1494304SMasahiro YamadaKBUILD_CFLAGS += -Wno-format-invalid-specifier
768a1494304SMasahiro YamadaKBUILD_CFLAGS += -Wno-gnu
769cfe17c9bSMasahiro Yamada# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
770cfe17c9bSMasahiro Yamada# source of a reference will be _MergedGlobals and not on of the whitelisted names.
771cfe17c9bSMasahiro Yamada# See modpost pattern 2
772a1494304SMasahiro YamadaKBUILD_CFLAGS += -mno-global-merge
773cfe17c9bSMasahiro Yamadaelse
774cfe17c9bSMasahiro Yamada
775cfe17c9bSMasahiro Yamada# These warnings generated too much noise in a regular build.
776cfe17c9bSMasahiro Yamada# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
7779df3e7a7SMasahiro YamadaKBUILD_CFLAGS += -Wno-unused-but-set-variable
778e2079e93SNathan Chancellor
779e2079e93SNathan Chancellor# Warn about unmarked fall-throughs in switch statement.
780e2079e93SNathan Chancellor# Disabled for clang while comment to attribute conversion happens and
781e2079e93SNathan Chancellor# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
782e2079e93SNathan ChancellorKBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
783cfe17c9bSMasahiro Yamadaendif
784cfe17c9bSMasahiro Yamada
7850a5f4176SSodagudi PrasadKBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
7861da177e4SLinus Torvaldsifdef CONFIG_FRAME_POINTER
787a0f97e06SSam RavnborgKBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
7881da177e4SLinus Torvaldselse
7897e9501fdSRabin Vincent# Some targets (ARM with Thumb2, for example), can't be built with frame
7907e9501fdSRabin Vincent# pointers.  For those, we don't have FUNCTION_TRACER automatically
7917e9501fdSRabin Vincent# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
7927e9501fdSRabin Vincent# incompatible with -fomit-frame-pointer with current GCC, so we don't use
7937e9501fdSRabin Vincent# -fomit-frame-pointer with FUNCTION_TRACER.
7947e9501fdSRabin Vincentifndef CONFIG_FUNCTION_TRACER
795a0f97e06SSam RavnborgKBUILD_CFLAGS	+= -fomit-frame-pointer
7961da177e4SLinus Torvaldsendif
7977e9501fdSRabin Vincentendif
7981da177e4SLinus Torvalds
799709a972eSKees Cook# Initialize all stack variables with a pattern, if desired.
800709a972eSKees Cookifdef CONFIG_INIT_STACK_ALL
801709a972eSKees CookKBUILD_CFLAGS	+= -ftrivial-auto-var-init=pattern
802709a972eSKees Cookendif
803709a972eSKees Cook
8041e88e415SMasahiro YamadaDEBUG_CFLAGS	:= $(call cc-option, -fno-var-tracking-assignments)
8052062afb4SLinus Torvalds
8061da177e4SLinus Torvaldsifdef CONFIG_DEBUG_INFO
807866ced95SAndi Kleenifdef CONFIG_DEBUG_INFO_SPLIT
8089d937444SMasahiro YamadaDEBUG_CFLAGS	+= -gsplit-dwarf
809866ced95SAndi Kleenelse
8101e88e415SMasahiro YamadaDEBUG_CFLAGS	+= -g
811866ced95SAndi Kleenendif
8122288328cSBehan WebsterKBUILD_AFLAGS	+= -Wa,-gdwarf-2
8131da177e4SLinus Torvaldsendif
814bfaf2dd3SAndi Kleenifdef CONFIG_DEBUG_INFO_DWARF4
8159d937444SMasahiro YamadaDEBUG_CFLAGS	+= -gdwarf-4
816bfaf2dd3SAndi Kleenendif
8171da177e4SLinus Torvalds
818d6f4ceb7SAndi Kleenifdef CONFIG_DEBUG_INFO_REDUCED
8191e88e415SMasahiro YamadaDEBUG_CFLAGS	+= $(call cc-option, -femit-struct-debug-baseonly) \
820e82c4bb8SAndi Kleen		   $(call cc-option,-fno-var-tracking)
821d6f4ceb7SAndi Kleenendif
822d6f4ceb7SAndi Kleen
82310e68b02SNick Desaulniersifdef CONFIG_DEBUG_INFO_COMPRESSED
82410e68b02SNick DesaulniersDEBUG_CFLAGS	+= -gz=zlib
82510e68b02SNick DesaulniersKBUILD_AFLAGS	+= -Wa,--compress-debug-sections=zlib
82610e68b02SNick DesaulniersKBUILD_LDFLAGS	+= --compress-debug-sections=zlib
82710e68b02SNick Desaulniersendif
82810e68b02SNick Desaulniers
8291e88e415SMasahiro YamadaKBUILD_CFLAGS += $(DEBUG_CFLAGS)
8301e88e415SMasahiro Yamadaexport DEBUG_CFLAGS
8311e88e415SMasahiro Yamada
832606576ceSSteven Rostedtifdef CONFIG_FUNCTION_TRACER
83307d04081SVasily Gorbikifdef CONFIG_FTRACE_MCOUNT_RECORD
83407d04081SVasily Gorbik  # gcc 5 supports generating the mcount tables directly
83507d04081SVasily Gorbik  ifeq ($(call cc-option-yn,-mrecord-mcount),y)
83607d04081SVasily Gorbik    CC_FLAGS_FTRACE	+= -mrecord-mcount
83707d04081SVasily Gorbik    export CC_USING_RECORD_MCOUNT := 1
838a2546faeSSteven Rostedt  endif
8392f4df001SVasily Gorbik  ifdef CONFIG_HAVE_NOP_MCOUNT
8402f4df001SVasily Gorbik    ifeq ($(call cc-option-yn, -mnop-mcount),y)
8412f4df001SVasily Gorbik      CC_FLAGS_FTRACE	+= -mnop-mcount
8422f4df001SVasily Gorbik      CC_FLAGS_USING	+= -DCC_USING_NOP_MCOUNT
8432f4df001SVasily Gorbik    endif
8442f4df001SVasily Gorbik  endif
84507d04081SVasily Gorbikendif
846a2546faeSSteven Rostedtifdef CONFIG_HAVE_FENTRY
847f28bc3c3SVasily Gorbik  ifeq ($(call cc-option-yn, -mfentry),y)
848f28bc3c3SVasily Gorbik    CC_FLAGS_FTRACE	+= -mfentry
849f28bc3c3SVasily Gorbik    CC_FLAGS_USING	+= -DCC_USING_FENTRY
850a2546faeSSteven Rostedt  endif
851f28bc3c3SVasily Gorbikendif
852f28bc3c3SVasily Gorbikexport CC_FLAGS_FTRACE
853f28bc3c3SVasily GorbikKBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
854f28bc3c3SVasily GorbikKBUILD_AFLAGS	+= $(CC_FLAGS_USING)
85572441cb1SSteven Rostedtifdef CONFIG_DYNAMIC_FTRACE
856cf4db259SSteven Rostedt	ifdef CONFIG_HAVE_C_RECORDMCOUNT
85772441cb1SSteven Rostedt		BUILD_C_RECORDMCOUNT := y
85872441cb1SSteven Rostedt		export BUILD_C_RECORDMCOUNT
85972441cb1SSteven Rostedt	endif
86072441cb1SSteven Rostedtendif
86116444a8aSArnaldo Carvalho de Meloendif
86216444a8aSArnaldo Carvalho de Melo
86391341d4bSSam Ravnborg# We trigger additional mismatches with less inlining
86491341d4bSSam Ravnborgifdef CONFIG_DEBUG_SECTION_MISMATCH
86591341d4bSSam RavnborgKBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
86691341d4bSSam Ravnborgendif
86791341d4bSSam Ravnborg
86890ad4052SMasahiro Yamadaifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
869e85d1d65SMasahiro YamadaKBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
870e85d1d65SMasahiro YamadaLDFLAGS_vmlinux += --gc-sections
87190ad4052SMasahiro Yamadaendif
87290ad4052SMasahiro Yamada
87343bd3a95SMiroslav Benesifdef CONFIG_LIVEPATCH
87443bd3a95SMiroslav BenesKBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
87543bd3a95SMiroslav Benesendif
87643bd3a95SMiroslav Benes
877e8e69931SSam Ravnborg# arch Makefile may override CC so keep this after arch Makefile is included
878e08d6de4SMasahiro YamadaNOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
879e8e69931SSam Ravnborg
8801da177e4SLinus Torvalds# warn about C99 declaration after statement
881a33e7ae2SMasahiro YamadaKBUILD_CFLAGS += -Wdeclaration-after-statement
8821da177e4SLinus Torvalds
8830bb95f80SKees Cook# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
8848289f913SMasahiro YamadaKBUILD_CFLAGS += -Wvla
8850bb95f80SKees Cook
886070b98bfSSam Ravnborg# disable pointer signed / unsigned warnings in gcc 4.0
887fb073a4bSMasahiro YamadaKBUILD_CFLAGS += -Wno-pointer-sign
8881da177e4SLinus Torvalds
889217c3e01SStephen Rothwell# disable stringop warnings in gcc 8+
890217c3e01SStephen RothwellKBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
891217c3e01SStephen Rothwell
8925c45de21SLinus Torvalds# We'll want to enable this eventually, but it's not going away for 5.7 at least
8935c45de21SLinus TorvaldsKBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
89444720996SLinus TorvaldsKBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
8955a76021cSLinus TorvaldsKBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
8965c45de21SLinus Torvalds
897adc71920SLinus Torvalds# Another good warning that we'll want to enable eventually
898adc71920SLinus TorvaldsKBUILD_CFLAGS += $(call cc-disable-warning, restrict)
899adc71920SLinus Torvalds
90078a5255fSLinus Torvalds# Enabled with W=2, disabled by default as noisy
90178a5255fSLinus TorvaldsKBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
90278a5255fSLinus Torvalds
903fe8d0a41SKirill Smelkov# disable invalid "can't wrap" optimizations for signed / pointers
904a137802eSLinus TorvaldsKBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
905d0115552SLinus Torvalds
90687e0d4f0SDaniel Borkmann# clang sets -fmerge-all-constants by default as optimization, but this
90787e0d4f0SDaniel Borkmann# is non-conforming behavior for C and in fact breaks the kernel, so we
90887e0d4f0SDaniel Borkmann# need to disable it here generally.
90987e0d4f0SDaniel BorkmannKBUILD_CFLAGS	+= $(call cc-option,-fno-merge-all-constants)
91087e0d4f0SDaniel Borkmann
91187e0d4f0SDaniel Borkmann# for gcc -fno-merge-all-constants disables everything, but it is fine
91287e0d4f0SDaniel Borkmann# to have actual conforming behavior enabled.
91387e0d4f0SDaniel BorkmannKBUILD_CFLAGS	+= $(call cc-option,-fmerge-constants)
91487e0d4f0SDaniel Borkmann
9153ce120b1SLinus Torvalds# Make sure -fstack-check isn't enabled (like gentoo apparently did)
9163ce120b1SLinus TorvaldsKBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
9173ce120b1SLinus Torvalds
9188f7f5c9fSAndi Kleen# conserve stack if available
9198f7f5c9fSAndi KleenKBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
9208f7f5c9fSAndi Kleen
921fe7c36c7SJosh Triplett# Prohibit date/time macros, which would make the build non-deterministic
922fe7c36c7SJosh TriplettKBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
923fe7c36c7SJosh Triplett
924ea8daa7bSDaniel Wagner# enforce correct pointer usage
925ea8daa7bSDaniel WagnerKBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
926ea8daa7bSDaniel Wagner
927c834f0e8SKees Cook# Require designated initializers for all marked structures
928c834f0e8SKees CookKBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
929c834f0e8SKees Cook
930a73619a8SMasahiro Yamada# change __FILE__ to the relative path from the srctree
931a73619a8SMasahiro YamadaKBUILD_CFLAGS	+= $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
932a73619a8SMasahiro Yamada
93329be86d7SSeth Forshee# ensure -fcf-protection is disabled when using retpoline as it is
93429be86d7SSeth Forshee# incompatible with -mindirect-branch=thunk-extern
93529be86d7SSeth Forsheeifdef CONFIG_RETPOLINE
93629be86d7SSeth ForsheeKBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
93729be86d7SSeth Forsheeendif
93829be86d7SSeth Forshee
939a436bb7bSMasahiro Yamadainclude scripts/Makefile.kasan
940a436bb7bSMasahiro Yamadainclude scripts/Makefile.extrawarn
941c6d30853SAndrey Ryabinininclude scripts/Makefile.ubsan
942a86fe353SMasahiro Yamada
9438cc7af75SMasahiro Yamada# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
9448cc7af75SMasahiro YamadaKBUILD_CPPFLAGS += $(KCPPFLAGS)
9458cc7af75SMasahiro YamadaKBUILD_AFLAGS   += $(KAFLAGS)
9468cc7af75SMasahiro YamadaKBUILD_CFLAGS   += $(KCFLAGS)
94752bcc330SSam Ravnborg
94889ff7131SMasahiro YamadaKBUILD_LDFLAGS_MODULE += --build-id
94989ff7131SMasahiro YamadaLDFLAGS_vmlinux += --build-id
95018991197SRoland McGrath
9515d7d18f5SDavid Howellsifeq ($(CONFIG_STRIP_ASM_SYMS),y)
952d79a2719SAndi KleenLDFLAGS_vmlinux	+= $(call ld-option, -X,)
9535d7d18f5SDavid Howellsendif
9545d7d18f5SDavid Howells
9555cf896fbSPeter Collingbourneifeq ($(CONFIG_RELR),y)
9565cf896fbSPeter CollingbourneLDFLAGS_vmlinux	+= --pack-dyn-relocs=relr
9575cf896fbSPeter Collingbourneendif
9585cf896fbSPeter Collingbourne
9597f3a59dbSMasahiro Yamada# Align the bit size of userspace programs with the kernel
9607f3a59dbSMasahiro YamadaKBUILD_USERCFLAGS  += $(filter -m32 -m64, $(KBUILD_CFLAGS))
9617f3a59dbSMasahiro YamadaKBUILD_USERLDFLAGS += $(filter -m32 -m64, $(KBUILD_CFLAGS))
9627f3a59dbSMasahiro Yamada
96380591e61SLuc Van Oostenryck# make the checker run with the right architecture
96480591e61SLuc Van OostenryckCHECKFLAGS += --arch=$(ARCH)
96580591e61SLuc Van Oostenryck
96614516765SLuc Van Oostenryck# insure the checker run with the right endianness
96714516765SLuc Van OostenryckCHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
96814516765SLuc Van Oostenryck
9691f2f01b1SLuc Van Oostenryck# the checker needs the correct machine size
9701f2f01b1SLuc Van OostenryckCHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
9711f2f01b1SLuc Van Oostenryck
9721da177e4SLinus Torvalds# Default kernel image to build when no specific target is given.
9731da177e4SLinus Torvalds# KBUILD_IMAGE may be overruled on the command line or
9741da177e4SLinus Torvalds# set in the environment
9751da177e4SLinus Torvalds# Also any assignments in arch/$(ARCH)/Makefile take precedence over
9761da177e4SLinus Torvalds# this default value
9771da177e4SLinus Torvaldsexport KBUILD_IMAGE ?= vmlinux
9781da177e4SLinus Torvalds
9791da177e4SLinus Torvalds#
9801da177e4SLinus Torvalds# INSTALL_PATH specifies where to place the updated kernel and system map
9811da177e4SLinus Torvalds# images. Default is /boot, but you can set it to other values
9821da177e4SLinus Torvaldsexport	INSTALL_PATH ?= /boot
9831da177e4SLinus Torvalds
9841da177e4SLinus Torvalds#
985f4d4ffc0SJason Cooper# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
986f4d4ffc0SJason Cooper# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
987f4d4ffc0SJason Cooper# an argument if needed. Otherwise it defaults to the kernel install path
988f4d4ffc0SJason Cooper#
989f4d4ffc0SJason Cooperexport INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
990f4d4ffc0SJason Cooper
991f4d4ffc0SJason Cooper#
9921da177e4SLinus Torvalds# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
9931da177e4SLinus Torvalds# relocations required by build roots.  This is not defined in the
994070b98bfSSam Ravnborg# makefile but the argument can be passed to make if needed.
9951da177e4SLinus Torvalds#
9961da177e4SLinus Torvalds
997df9df036SSam RavnborgMODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
9981da177e4SLinus Torvaldsexport MODLIB
9991da177e4SLinus Torvalds
1000ac031f26STheodore Ts'o#
10012ea03891SSam Ravnborg# INSTALL_MOD_STRIP, if defined, will cause modules to be
10022ea03891SSam Ravnborg# stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
10032ea03891SSam Ravnborg# the default option --strip-debug will be used.  Otherwise,
1004177b241dSGilles Espinasse# INSTALL_MOD_STRIP value will be used as the options to the strip command.
10052ea03891SSam Ravnborg
1006ac031f26STheodore Ts'oifdef INSTALL_MOD_STRIP
1007ac031f26STheodore Ts'oifeq ($(INSTALL_MOD_STRIP),1)
10082ea03891SSam Ravnborgmod_strip_cmd = $(STRIP) --strip-debug
1009ac031f26STheodore Ts'oelse
10102ea03891SSam Ravnborgmod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
1011ac031f26STheodore Ts'oendif # INSTALL_MOD_STRIP=1
1012ac031f26STheodore Ts'oelse
10132ea03891SSam Ravnborgmod_strip_cmd = true
1014ac031f26STheodore Ts'oendif # INSTALL_MOD_STRIP
1015ac031f26STheodore Ts'oexport mod_strip_cmd
1016ac031f26STheodore Ts'o
1017beb50df3SBertrand Jacquin# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
1018beb50df3SBertrand Jacquin# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
1019beb50df3SBertrand Jacquin# or CONFIG_MODULE_COMPRESS_XZ.
1020beb50df3SBertrand Jacquin
1021beb50df3SBertrand Jacquinmod_compress_cmd = true
1022beb50df3SBertrand Jacquinifdef CONFIG_MODULE_COMPRESS
1023beb50df3SBertrand Jacquin  ifdef CONFIG_MODULE_COMPRESS_GZIP
10243d1450d5SJason A. Donenfeld    mod_compress_cmd = gzip -n -f
1025beb50df3SBertrand Jacquin  endif # CONFIG_MODULE_COMPRESS_GZIP
1026beb50df3SBertrand Jacquin  ifdef CONFIG_MODULE_COMPRESS_XZ
10273d1450d5SJason A. Donenfeld    mod_compress_cmd = xz -f
1028beb50df3SBertrand Jacquin  endif # CONFIG_MODULE_COMPRESS_XZ
1029beb50df3SBertrand Jacquinendif # CONFIG_MODULE_COMPRESS
1030beb50df3SBertrand Jacquinexport mod_compress_cmd
1031beb50df3SBertrand Jacquin
1032d9d8d7edSMichal Marekifdef CONFIG_MODULE_SIG_ALL
10333ee550f1SDavid Woodhouse$(eval $(call config_filename,MODULE_SIG_KEY))
10343ee550f1SDavid Woodhouse
10353ee550f1SDavid Woodhousemod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
1036e2a666d5SRusty Russellelse
1037e2a666d5SRusty Russellmod_sign_cmd = true
1038e2a666d5SRusty Russellendif
1039e2a666d5SRusty Russellexport mod_sign_cmd
1040e2a666d5SRusty Russell
1041056d28d1SRolf Eike BeerHOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
1042056d28d1SRolf Eike Beer
10439f0c18aeSJosh Poimboeufifdef CONFIG_STACK_VALIDATION
10449f0c18aeSJosh Poimboeuf  has_libelf := $(call try-run,\
1045056d28d1SRolf Eike Beer		echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
10469f0c18aeSJosh Poimboeuf  ifeq ($(has_libelf),1)
10479f0c18aeSJosh Poimboeuf    objtool_target := tools/objtool FORCE
10489f0c18aeSJosh Poimboeuf  else
10499f0c18aeSJosh Poimboeuf    SKIP_STACK_VALIDATION := 1
10509f0c18aeSJosh Poimboeuf    export SKIP_STACK_VALIDATION
10519f0c18aeSJosh Poimboeuf  endif
10529f0c18aeSJosh Poimboeufendif
10539f0c18aeSJosh Poimboeuf
1054e00d8880SMasahiro YamadaPHONY += prepare0
1055e2a666d5SRusty Russell
1056394053f4SMasahiro Yamadaexport MODORDER := $(extmod-prefix)modules.order
1057bc35d4bdSMasahiro Yamadaexport MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
105847801c97SMasahiro Yamada
10591da177e4SLinus Torvaldsifeq ($(KBUILD_EXTMOD),)
1060cfc411e7SDavid Howellscore-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
10611da177e4SLinus Torvalds
1062*23febe37SMasahiro Yamadavmlinux-dirs	:= $(patsubst %/,%,$(filter %/, \
10631da177e4SLinus Torvalds		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
106437d9fe47SFeng Wu		     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
10651da177e4SLinus Torvalds
10661eaca4b9SMasahiro Yamadavmlinux-alldirs	:= $(sort $(vmlinux-dirs) Documentation \
1067*23febe37SMasahiro Yamada		     $(patsubst %/,%,$(filter %/, $(core-) \
10681eaca4b9SMasahiro Yamada			$(drivers-) $(net-) $(libs-) $(virt-))))
10691da177e4SLinus Torvalds
1070c99f3918SMasahiro Yamadabuild-dirs	:= $(vmlinux-dirs)
107176cd306dSMasahiro Yamadaclean-dirs	:= $(vmlinux-alldirs)
1072c99f3918SMasahiro Yamada
1073f49821eeSNicholas Piggincore-y		:= $(patsubst %/, %/built-in.a, $(core-y))
1074f49821eeSNicholas Piggindrivers-y	:= $(patsubst %/, %/built-in.a, $(drivers-y))
1075f49821eeSNicholas Pigginnet-y		:= $(patsubst %/, %/built-in.a, $(net-y))
10767273ad2bSMasahiro Yamadalibs-y2		:= $(patsubst %/, %/built-in.a, $(filter %/, $(libs-y)))
10777273ad2bSMasahiro Yamadaifdef CONFIG_MODULES
10787273ad2bSMasahiro Yamadalibs-y1		:= $(filter-out %/, $(libs-y))
10797273ad2bSMasahiro Yamadalibs-y2		+= $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
10807273ad2bSMasahiro Yamadaelse
10811da177e4SLinus Torvaldslibs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
10827273ad2bSMasahiro Yamadaendif
1083f49821eeSNicholas Pigginvirt-y		:= $(patsubst %/, %/built-in.a, $(virt-y))
10841da177e4SLinus Torvalds
10851f2bfbd0SSam Ravnborg# Externally visible symbols (used by link-vmlinux.sh)
1086*23febe37SMasahiro Yamadaexport KBUILD_VMLINUX_OBJS := $(head-y) $(core-y) $(libs-y2) \
1087d151e971SMasahiro Yamada			      $(drivers-y) $(net-y) $(virt-y)
10883a166fc2SNicholas Pigginexport KBUILD_VMLINUX_LIBS := $(libs-y1)
108995698570SSam Ravnborgexport KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
10901f2bfbd0SSam Ravnborgexport LDFLAGS_vmlinux
109185f0ae7eSMasahiro Yamada# used by scripts/Makefile.package
1092233c741dSMasahiro Yamadaexport KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
10931da177e4SLinus Torvalds
1094d151e971SMasahiro Yamadavmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
10951da177e4SLinus Torvalds
10963fdc7d3fSMasahiro Yamada# Recurse until adjust_autoksyms.sh is satisfied
10973fdc7d3fSMasahiro YamadaPHONY += autoksyms_recursive
10982441e78bSNicolas Pitreifdef CONFIG_TRIM_UNUSED_KSYMS
10991f50b80aSMasahiro Yamada# For the kernel to actually contain only the needed exported symbols,
11001f50b80aSMasahiro Yamada# we have to build modules as well to determine what those symbols are.
11011f50b80aSMasahiro Yamada# (this can be evaluated only once include/config/auto.conf has been included)
11021f50b80aSMasahiro YamadaKBUILD_MODULES := 1
1103fb2d99beSMasahiro Yamada
1104fb2d99beSMasahiro Yamadaautoksyms_recursive: descend modules.order
1105fb2d99beSMasahiro Yamada	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1106fb2d99beSMasahiro Yamada	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
11071f50b80aSMasahiro Yamadaendif
11081f50b80aSMasahiro Yamada
110907a422bbSMasahiro Yamadaautoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
111007a422bbSMasahiro Yamada
111188694cffSQuentin Perretquiet_cmd_autoksyms_h = GEN     $@
111288694cffSQuentin Perret      cmd_autoksyms_h = mkdir -p $(dir $@); \
111388694cffSQuentin Perret			$(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
111488694cffSQuentin Perret
111507a422bbSMasahiro Yamada$(autoksyms_h):
111688694cffSQuentin Perret	$(call cmd,autoksyms_h)
111723121ca2SNicolas Pitre
1118fbe6e37dSNicholas PigginARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1119fbe6e37dSNicholas Piggin
1120fbe6e37dSNicholas Piggin# Final link of vmlinux with optional arch pass after final link
1121fbe6e37dSNicholas Piggincmd_link-vmlinux =                                                 \
1122d503ac53SMasahiro Yamada	$(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1123fbe6e37dSNicholas Piggin	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
11242441e78bSNicolas Pitre
11253fdc7d3fSMasahiro Yamadavmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
11261f2bfbd0SSam Ravnborg	+$(call if_changed,link-vmlinux)
1127741f98feSSam Ravnborg
1128392885eeSMasahiro Yamadatargets := vmlinux
1129392885eeSMasahiro Yamada
11301da177e4SLinus Torvalds# The actual objects are generated when descending,
11311da177e4SLinus Torvalds# make sure no implicit rule kicks in
1132c99f3918SMasahiro Yamada$(sort $(vmlinux-deps)): descend ;
11331da177e4SLinus Torvalds
1134ba97df45SMasahiro Yamadafilechk_kernel.release = \
11350d0e7718SMichal Marek	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
11360d0e7718SMichal Marek
113783a35e36SGeert Uytterhoeven# Store (new) KERNELRELEASE string in include/config/kernel.release
113824512795SMasahiro Yamadainclude/config/kernel.release: FORCE
11390d0e7718SMichal Marek	$(call filechk,kernel.release)
1140cb58455cSSam Ravnborg
1141d8821622SMasahiro Yamada# Additional helpers built in scripts/
1142d8821622SMasahiro Yamada# Carefully list dependencies so we do not try to build scripts twice
1143d8821622SMasahiro Yamada# in parallel
1144d8821622SMasahiro YamadaPHONY += scripts
114560df1aeeSMasahiro Yamadascripts: scripts_basic scripts_dtc
1146d8821622SMasahiro Yamada	$(Q)$(MAKE) $(build)=$(@)
1147cb58455cSSam Ravnborg
11481da177e4SLinus Torvalds# Things we need to do before we recursively start building the kernel
11495bb78269SSam Ravnborg# or the modules are listed in "prepare".
11505bb78269SSam Ravnborg# A multi level approach is used. prepareN is processed before prepareN-1.
11515bb78269SSam Ravnborg# archprepare is used in arch Makefiles and when processed asm symlink,
11525bb78269SSam Ravnborg# version.h and scripts_basic is processed / created.
11531da177e4SLinus Torvalds
1154a5139fb3SMasahiro YamadaPHONY += prepare archprepare
11555bb78269SSam Ravnborg
115636de077bSMasahiro Yamadaarchprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
11573044dd05SMasahiro Yamada	asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
11583044dd05SMasahiro Yamada	include/generated/autoconf.h
11595bb78269SSam Ravnborg
116065bba042SMasahiro Yamadaprepare0: archprepare
116160df1aeeSMasahiro Yamada	$(Q)$(MAKE) $(build)=scripts/mod
11628d36a623SSam Ravnborg	$(Q)$(MAKE) $(build)=.
116386feeaa8SSam Ravnborg
11641da177e4SLinus Torvalds# All the preparing..
1165b9ab5ebbSJosh Poimboeufprepare: prepare0 prepare-objtool
1166b9ab5ebbSJosh Poimboeuf
11672c1f4f12SMasahiro Yamada# Support for using generic headers in asm-generic
11687d0e5c20SMasahiro Yamadaasm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
11697d0e5c20SMasahiro Yamada
11702c1f4f12SMasahiro YamadaPHONY += asm-generic uapi-asm-generic
11712c1f4f12SMasahiro Yamadaasm-generic: uapi-asm-generic
1172037fc336SMasahiro Yamada	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1173037fc336SMasahiro Yamada	generic=include/asm-generic
11742c1f4f12SMasahiro Yamadauapi-asm-generic:
1175037fc336SMasahiro Yamada	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1176037fc336SMasahiro Yamada	generic=include/uapi/asm-generic
11772c1f4f12SMasahiro Yamada
1178b9ab5ebbSJosh PoimboeufPHONY += prepare-objtool
11793b27a0c8SJosh Poimboeufprepare-objtool: $(objtool_target)
1180ef7cfd00SMasahiro Yamadaifeq ($(SKIP_STACK_VALIDATION),1)
1181ef7cfd00SMasahiro Yamadaifdef CONFIG_UNWINDER_ORC
1182ef7cfd00SMasahiro Yamada	@echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1183ef7cfd00SMasahiro Yamada	@false
1184ef7cfd00SMasahiro Yamadaelse
1185ef7cfd00SMasahiro Yamada	@echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1186ef7cfd00SMasahiro Yamadaendif
1187ef7cfd00SMasahiro Yamadaendif
11881da177e4SLinus Torvalds
11891da177e4SLinus Torvalds# Generate some files
11901da177e4SLinus Torvalds# ---------------------------------------------------------------------------
11911da177e4SLinus Torvalds
11921da177e4SLinus Torvalds# KERNELRELEASE can change from a few different places, meaning version.h
11931da177e4SLinus Torvalds# needs to be updated, so this check is forced on all builds
11941da177e4SLinus Torvalds
11951da177e4SLinus Torvaldsuts_len := 64
119663104eecSSam Ravnborgdefine filechk_utsrelease.h
11971da177e4SLinus Torvalds	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
11981da177e4SLinus Torvalds	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
11991da177e4SLinus Torvalds	  exit 1;                                                         \
12001da177e4SLinus Torvalds	fi;                                                               \
1201ad774086SMasahiro Yamada	echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
12021da177e4SLinus Torvaldsendef
12031da177e4SLinus Torvalds
120463104eecSSam Ravnborgdefine filechk_version.h
1205ad774086SMasahiro Yamada	echo \#define LINUX_VERSION_CODE $(shell                         \
120678d3bb44SMichal Marek	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1207ad774086SMasahiro Yamada	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
120863104eecSSam Ravnborgendef
120963104eecSSam Ravnborg
121043fee2b2SMasahiro Yamada$(version_h): FORCE
12111da177e4SLinus Torvalds	$(call filechk,version.h)
1212223c24a7SMichal Marek	$(Q)rm -f $(old_version_h)
12131da177e4SLinus Torvalds
1214273b281fSSam Ravnborginclude/generated/utsrelease.h: include/config/kernel.release FORCE
121563104eecSSam Ravnborg	$(call filechk,utsrelease.h)
121663104eecSSam Ravnborg
1217179efcb4SVegard NossumPHONY += headerdep
1218179efcb4SVegard Nossumheaderdep:
12199663d989SPeter Foley	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
12209663d989SPeter Foley	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1221179efcb4SVegard Nossum
12221da177e4SLinus Torvalds# ---------------------------------------------------------------------------
12238d730cfbSDavid Woodhouse# Kernel headers
12248d730cfbSDavid Woodhouse
1225e6883b18SSam Ravnborg#Default location for installed headers
1226e6883b18SSam Ravnborgexport INSTALL_HDR_PATH = $(objtree)/usr
1227e6883b18SSam Ravnborg
122859b2bd05SMasahiro Yamadaquiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
122959b2bd05SMasahiro Yamada      cmd_headers_install = \
123059b2bd05SMasahiro Yamada	mkdir -p $(INSTALL_HDR_PATH); \
123159b2bd05SMasahiro Yamada	rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
123259b2bd05SMasahiro Yamada	usr/include $(INSTALL_HDR_PATH)
12336d716275SDavid Woodhouse
12348d730cfbSDavid WoodhousePHONY += headers_install
123559b2bd05SMasahiro Yamadaheaders_install: headers
123659b2bd05SMasahiro Yamada	$(call cmd,headers_install)
12374f193362SPaul Smith
12381da177e4SLinus TorvaldsPHONY += archheaders archscripts
12391da177e4SLinus Torvalds
1240a5bae54cSMasahiro Yamadahdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
12411da177e4SLinus Torvalds
124259b2bd05SMasahiro YamadaPHONY += headers
124359b2bd05SMasahiro Yamadaheaders: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
12449d022c54SMasahiro Yamada	$(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
12452fb9b1bdSSam Ravnborg	  $(error Headers not exportable for the $(SRCARCH) architecture))
1246d5470d14SMasahiro Yamada	$(Q)$(MAKE) $(hdr-inst)=include/uapi
1247d5470d14SMasahiro Yamada	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
12481f85712eSMike Frysinger
12497ecaf069SMasahiro Yamada# Deprecated. It is no-op now.
125068475359SDavid WoodhousePHONY += headers_check
12517ecaf069SMasahiro Yamadaheaders_check:
12527ecaf069SMasahiro Yamada	@:
125368475359SDavid Woodhouse
1254e949f4c2SMasahiro Yamadaifdef CONFIG_HEADERS_INSTALL
125559b2bd05SMasahiro Yamadaprepare: headers
1256e949f4c2SMasahiro Yamadaendif
12571da177e4SLinus Torvalds
1258bdd7714bSMasahiro YamadaPHONY += scripts_unifdef
1259bdd7714bSMasahiro Yamadascripts_unifdef: scripts_basic
1260bdd7714bSMasahiro Yamada	$(Q)$(MAKE) $(build)=scripts scripts/unifdef
1261bdd7714bSMasahiro Yamada
12621da177e4SLinus Torvalds# ---------------------------------------------------------------------------
12635a5da78bSShuah Khan# Kernel selftest
12645a5da78bSShuah Khan
12655a5da78bSShuah KhanPHONY += kselftest
12665a5da78bSShuah Khankselftest:
12672bc84526SShuah Khan	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
12685a5da78bSShuah Khan
126917eac6c2SShuah Khankselftest-%: FORCE
127017eac6c2SShuah Khan	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1271dcb825a9SWang Long
12723d6dee7aSBamvor Jian ZhangPHONY += kselftest-merge
12733d6dee7aSBamvor Jian Zhangkselftest-merge:
12743d6dee7aSBamvor Jian Zhang	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
12756d3db46cSDan Rue	$(Q)find $(srctree)/tools/testing/selftests -name config | \
12766d3db46cSDan Rue		xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
12773e4c6948SMasahiro Yamada	$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
12783d6dee7aSBamvor Jian Zhang
12795a5da78bSShuah Khan# ---------------------------------------------------------------------------
128037c8a5faSRob Herring# Devicetree files
128137c8a5faSRob Herring
128237c8a5faSRob Herringifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
128337c8a5faSRob Herringdtstree := arch/$(SRCARCH)/boot/dts
128437c8a5faSRob Herringendif
128537c8a5faSRob Herring
128637c8a5faSRob Herringifneq ($(dtstree),)
128737c8a5faSRob Herring
1288a5139fb3SMasahiro Yamada%.dtb: include/config/kernel.release scripts_dtc
128937c8a5faSRob Herring	$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
129037c8a5faSRob Herring
1291c473a8d0SMasahiro YamadaPHONY += dtbs dtbs_install dtbs_check
1292b5154bf6SMasahiro Yamadadtbs: include/config/kernel.release scripts_dtc
129337c8a5faSRob Herring	$(Q)$(MAKE) $(build)=$(dtstree)
129437c8a5faSRob Herring
1295b5154bf6SMasahiro Yamadaifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1296e10c4321SMasahiro Yamadaexport CHECK_DTBS=y
1297b5154bf6SMasahiro Yamadadtbs: dt_binding_check
1298b5154bf6SMasahiro Yamadaendif
1299b5154bf6SMasahiro Yamada
1300b5154bf6SMasahiro Yamadadtbs_check: dtbs
13014f0e3a57SRob Herring
130237c8a5faSRob Herringdtbs_install:
13032431f22aSMasahiro Yamada	$(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
130437c8a5faSRob Herring
130537c8a5faSRob Herringifdef CONFIG_OF_EARLY_FLATTREE
130637c8a5faSRob Herringall: dtbs
130737c8a5faSRob Herringendif
130837c8a5faSRob Herring
130937c8a5faSRob Herringendif
131037c8a5faSRob Herring
131137c8a5faSRob HerringPHONY += scripts_dtc
131237c8a5faSRob Herringscripts_dtc: scripts_basic
131337c8a5faSRob Herring	$(Q)$(MAKE) $(build)=scripts/dtc
131437c8a5faSRob Herring
1315e10c4321SMasahiro Yamadaifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1316e10c4321SMasahiro Yamadaexport CHECK_DT_BINDING=y
1317e10c4321SMasahiro Yamadaendif
1318e10c4321SMasahiro Yamada
1319c473a8d0SMasahiro YamadaPHONY += dt_binding_check
13204f0e3a57SRob Herringdt_binding_check: scripts_dtc
13214f0e3a57SRob Herring	$(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
13224f0e3a57SRob Herring
132337c8a5faSRob Herring# ---------------------------------------------------------------------------
13241da177e4SLinus Torvalds# Modules
13251da177e4SLinus Torvalds
13261da177e4SLinus Torvaldsifdef CONFIG_MODULES
13271da177e4SLinus Torvalds
13281da177e4SLinus Torvalds# By default, build modules as well
13291da177e4SLinus Torvalds
133073d1393eSMichal Marekall: modules
13311da177e4SLinus Torvalds
13324b50c8c4SMasahiro Yamada# When we're building modules with modversions, we need to consider
13334b50c8c4SMasahiro Yamada# the built-in objects during the descend as well, in order to
13344b50c8c4SMasahiro Yamada# make sure the checksums are up to date before we record them.
13354b50c8c4SMasahiro Yamadaifdef CONFIG_MODVERSIONS
13364b50c8c4SMasahiro Yamada  KBUILD_BUILTIN := 1
13374b50c8c4SMasahiro Yamadaendif
13384b50c8c4SMasahiro Yamada
13391da177e4SLinus Torvalds# Build modules
1340551559e1STejun Heo#
1341551559e1STejun Heo# A module can be listed more than once in obj-m resulting in
1342551559e1STejun Heo# duplicate lines in modules.order files.  Those are removed
1343551559e1STejun Heo# using awk while concatenating to the final file.
13441da177e4SLinus Torvalds
13454f193362SPaul SmithPHONY += modules
13468451791dSMasahiro Yamadamodules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check
1347b805aa0eSSam Ravnborg	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
13488451791dSMasahiro Yamada
13498451791dSMasahiro YamadaPHONY += modules_check
13508451791dSMasahiro Yamadamodules_check: modules.order
13518451791dSMasahiro Yamada	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
13521da177e4SLinus Torvalds
1353c99f3918SMasahiro Yamadamodules.order: descend
1354c99f3918SMasahiro Yamada	$(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
1355a6c36632SMichal Marek
13561da177e4SLinus Torvalds# Target to prepare building external modules
13574f193362SPaul SmithPHONY += modules_prepare
1358059bc9fcSMasahiro Yamadamodules_prepare: prepare
13591da177e4SLinus Torvalds
13601da177e4SLinus Torvalds# Target to install modules
13614f193362SPaul SmithPHONY += modules_install
13621da177e4SLinus Torvaldsmodules_install: _modinst_ _modinst_post
13631da177e4SLinus Torvalds
13644f193362SPaul SmithPHONY += _modinst_
13652da30e70SMichal Marek_modinst_:
13661da177e4SLinus Torvalds	@rm -rf $(MODLIB)/kernel
13671da177e4SLinus Torvalds	@rm -f $(MODLIB)/source
13681da177e4SLinus Torvalds	@mkdir -p $(MODLIB)/kernel
13698e9b4667SMasahiro Yamada	@ln -s $(abspath $(srctree)) $(MODLIB)/source
13701da177e4SLinus Torvalds	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
13711da177e4SLinus Torvalds		rm -f $(MODLIB)/build ; \
13727e1c0477SMichal Marek		ln -s $(CURDIR) $(MODLIB)/build ; \
13731da177e4SLinus Torvalds	fi
13741bd9a468SMasahiro Yamada	@sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
13758b41fc44SMasahiro Yamada	@cp -f modules.builtin $(MODLIB)/
1376898490c0SAlexey Gladkov	@cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1377b805aa0eSSam Ravnborg	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
13781da177e4SLinus Torvalds
137950a8ec31SSam Ravnborg# This depmod is only for convenience to give the initial
13801da177e4SLinus Torvalds# boot a modules.dep even before / is mounted read-write.  However the
13811da177e4SLinus Torvalds# boot script depmod is the master version.
13824f193362SPaul SmithPHONY += _modinst_post
13836d128e1eSLinus Torvalds_modinst_post: _modinst_
138450a8ec31SSam Ravnborg	$(call cmd,depmod)
13851da177e4SLinus Torvalds
1386d890f510SJosh Boyerifeq ($(CONFIG_MODULE_SIG), y)
1387d890f510SJosh BoyerPHONY += modules_sign
1388d890f510SJosh Boyermodules_sign:
1389d890f510SJosh Boyer	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1390d890f510SJosh Boyerendif
1391d890f510SJosh Boyer
13921da177e4SLinus Torvaldselse # CONFIG_MODULES
13931da177e4SLinus Torvalds
13941da177e4SLinus Torvalds# Modules not configured
13951da177e4SLinus Torvalds# ---------------------------------------------------------------------------
13961da177e4SLinus Torvalds
1397612e47ceSMasahiro YamadaPHONY += modules modules_install
1398612e47ceSMasahiro Yamadamodules modules_install:
13995369f550SMichal Marek	@echo >&2
14005369f550SMichal Marek	@echo >&2 "The present kernel configuration has modules disabled."
14015369f550SMichal Marek	@echo >&2 "Type 'make config' and enable loadable module support."
14025369f550SMichal Marek	@echo >&2 "Then build a kernel with module support enabled."
14035369f550SMichal Marek	@echo >&2
14041da177e4SLinus Torvalds	@exit 1
14051da177e4SLinus Torvalds
14061da177e4SLinus Torvaldsendif # CONFIG_MODULES
14071da177e4SLinus Torvalds
14081da177e4SLinus Torvalds###
14091da177e4SLinus Torvalds# Cleaning is done on three levels.
14101da177e4SLinus Torvalds# make clean     Delete most generated files
14111da177e4SLinus Torvalds#                Leave enough to build external modules
14121da177e4SLinus Torvalds# make mrproper  Delete the current configuration, and all generated files
14131da177e4SLinus Torvalds# make distclean Remove editor backup files, patch leftover files and the like
14141da177e4SLinus Torvalds
14151da177e4SLinus Torvalds# Directories & files removed with 'make clean'
14160663c68cSMasahiro YamadaCLEAN_FILES += include/ksym \
14170663c68cSMasahiro Yamada	       modules.builtin modules.builtin.modinfo modules.nsdeps
14181da177e4SLinus Torvalds
14191da177e4SLinus Torvalds# Directories & files removed with 'make mrproper'
14200663c68cSMasahiro YamadaMRPROPER_FILES += include/config include/generated          \
142146a63d4bSMasahiro Yamada		  arch/$(SRCARCH)/include/generated .tmp_objdiff \
14220663c68cSMasahiro Yamada		  debian snap tar-install \
14230663c68cSMasahiro Yamada		  .config .config.old .version \
142446457133SMasahiro Yamada		  Module.symvers \
1425fb117949SDavid Woodhouse		  signing_key.pem signing_key.priv signing_key.x509	\
1426fb117949SDavid Woodhouse		  x509.genkey extra_certificates signing_key.x509.keyid	\
142746a63d4bSMasahiro Yamada		  signing_key.x509.signer vmlinux-gdb.py \
142846a63d4bSMasahiro Yamada		  *.spec
14291da177e4SLinus Torvalds
143046457133SMasahiro Yamada# Directories & files removed with 'make distclean'
143146457133SMasahiro YamadaDISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
143246457133SMasahiro Yamada
14331da177e4SLinus Torvalds# clean - Delete most, but leave enough to build external modules
14341da177e4SLinus Torvalds#
14351da177e4SLinus Torvaldsclean: rm-files := $(CLEAN_FILES)
14361da177e4SLinus Torvalds
143776cd306dSMasahiro YamadaPHONY += archclean vmlinuxclean
14381da177e4SLinus Torvalds
1439bd1ee804SPawel Mollvmlinuxclean:
1440bd1ee804SPawel Moll	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1441fbe6e37dSNicholas Piggin	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1442bd1ee804SPawel Moll
1443bd1ee804SPawel Mollclean: archclean vmlinuxclean
14441da177e4SLinus Torvalds
14451da177e4SLinus Torvalds# mrproper - Delete all generated files, including .config
14461da177e4SLinus Torvalds#
14471da177e4SLinus Torvaldsmrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1448cb43fb57SMauro Carvalho Chehabmrproper-dirs      := $(addprefix _mrproper_,scripts)
14491da177e4SLinus Torvalds
1450b421b8a6SMasahiro YamadaPHONY += $(mrproper-dirs) mrproper
14511da177e4SLinus Torvalds$(mrproper-dirs):
14521da177e4SLinus Torvalds	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
14531da177e4SLinus Torvalds
1454b421b8a6SMasahiro Yamadamrproper: clean $(mrproper-dirs)
14551da177e4SLinus Torvalds	$(call cmd,rmfiles)
14561da177e4SLinus Torvalds
14571da177e4SLinus Torvalds# distclean
14581da177e4SLinus Torvalds#
145946457133SMasahiro Yamadadistclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
146046457133SMasahiro Yamada
14614f193362SPaul SmithPHONY += distclean
14621da177e4SLinus Torvalds
14631da177e4SLinus Torvaldsdistclean: mrproper
146446457133SMasahiro Yamada	$(call cmd,rmfiles)
14651da177e4SLinus Torvalds	@find $(srctree) $(RCS_FIND_IGNORE) \
14661da177e4SLinus Torvalds		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1467f78271dfSMasahiro Yamada		-o -name '*.bak' -o -name '#*#' -o -name '*%' \
1468f78271dfSMasahiro Yamada		-o -name 'core' \) \
14691da177e4SLinus Torvalds		-type f -print | xargs rm -f
14701da177e4SLinus Torvalds
14711da177e4SLinus Torvalds
14721da177e4SLinus Torvalds# Packaging of the kernel to various formats
14731da177e4SLinus Torvalds# ---------------------------------------------------------------------------
14741da177e4SLinus Torvalds
1475bafb6747SArnaldo Carvalho de Melo%src-pkg: FORCE
1476000ec95fSMasahiro Yamada	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1477031ecc6dSZach Brown%pkg: include/config/kernel.release FORCE
1478000ec95fSMasahiro Yamada	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
14791da177e4SLinus Torvalds
14801da177e4SLinus Torvalds# Brief documentation of the typical targets used
14811da177e4SLinus Torvalds# ---------------------------------------------------------------------------
14821da177e4SLinus Torvalds
14835dffbe81SSegher Boessenkoolboards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1484a1e7b7bbSKonstantin Khlebnikovboards := $(sort $(notdir $(boards)))
14855dffbe81SSegher Boessenkoolboard-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
14865dffbe81SSegher Boessenkoolboard-dirs := $(sort $(notdir $(board-dirs:/=)))
14871da177e4SLinus Torvalds
1488fe69b420SMasahiro YamadaPHONY += help
14891da177e4SLinus Torvaldshelp:
14901da177e4SLinus Torvalds	@echo  'Cleaning targets:'
14915ea084efSSamuel Tardieu	@echo  '  clean		  - Remove most generated files but keep the config and'
14925cc8d246SJesper Juhl	@echo  '                    enough build support to build external modules'
14935ea084efSSamuel Tardieu	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
14945cc8d246SJesper Juhl	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
14951da177e4SLinus Torvalds	@echo  ''
14961da177e4SLinus Torvalds	@echo  'Configuration targets:'
14971da177e4SLinus Torvalds	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
14981da177e4SLinus Torvalds	@echo  ''
14991da177e4SLinus Torvalds	@echo  'Other generic targets:'
15001da177e4SLinus Torvalds	@echo  '  all		  - Build all targets marked with [*]'
15011da177e4SLinus Torvalds	@echo  '* vmlinux	  - Build the bare kernel'
15021da177e4SLinus Torvalds	@echo  '* modules	  - Build all modules'
15039cc5d74cSBodo Eggert	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
15041da177e4SLinus Torvalds	@echo  '  dir/            - Build all files in dir and below'
150540ab87a4SWang YanQing	@echo  '  dir/file.[ois]  - Build specified target only'
1506433db3e2SVinícius Tinti	@echo  '  dir/file.ll     - Build the LLVM assembly file'
1507433db3e2SVinícius Tinti	@echo  '                    (requires compiler support for LLVM assembly generation)'
150862718979SJoe Perches	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
150962718979SJoe Perches	@echo  '                    (requires a recent binutils and recent build (System.map))'
1510155ad605SSam Ravnborg	@echo  '  dir/file.ko     - Build module including final link'
1511c4d5ee67SRobert P. J. Day	@echo  '  modules_prepare - Set up for building external modules'
15121da177e4SLinus Torvalds	@echo  '  tags/TAGS	  - Generate tags file for editors'
15131da177e4SLinus Torvalds	@echo  '  cscope	  - Generate cscope index'
1514f4ed1009SJianbin Kang	@echo  '  gtags           - Generate GNU GLOBAL index'
15153f1d9a6cSMichal Marek	@echo  '  kernelrelease	  - Output the release version string (use with make -s)'
15163f1d9a6cSMichal Marek	@echo  '  kernelversion	  - Output the version stored in Makefile (use with make -s)'
15173f1d9a6cSMichal Marek	@echo  '  image_name	  - Output the image name (use with make -s)'
15182fb9b1bdSSam Ravnborg	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
151959df3230SGeert Uytterhoeven	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
15202fb9b1bdSSam Ravnborg	 echo  ''
152131b8cc80SRandy Dunlap	@echo  'Static analysers:'
15221da177e4SLinus Torvalds	@echo  '  checkstack      - Generate a list of stack hogs'
15231da177e4SLinus Torvalds	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1524aa025e7dSSam Ravnborg	@echo  '  versioncheck    - Sanity check on version.h usage'
1525ec2d987fSRandy Dunlap	@echo  '  includecheck    - Check for duplicate included header files'
1526295ac051SAdrian Bunk	@echo  '  export_report   - List the usages of all exported symbols'
152774425eeeSNicolas Palix	@echo  '  headerdep       - Detect inclusion cycles in headers'
15287f855fc8SMasahiro Yamada	@echo  '  coccicheck      - Check with Coccinelle'
152974425eeeSNicolas Palix	@echo  ''
1530eb8305aeSMatthias Maennich	@echo  'Tools:'
1531eb8305aeSMatthias Maennich	@echo  '  nsdeps          - Generate missing symbol namespace dependencies'
1532eb8305aeSMatthias Maennich	@echo  ''
153331b8cc80SRandy Dunlap	@echo  'Kernel selftest:'
1534e51d8dacSShuah Khan	@echo  '  kselftest         - Build and run kernel selftest'
15355a5da78bSShuah Khan	@echo  '                      Build, install, and boot kernel before'
15365a5da78bSShuah Khan	@echo  '                      running kselftest on it'
1537e51d8dacSShuah Khan	@echo  '                      Run as root for full coverage'
1538e51d8dacSShuah Khan	@echo  '  kselftest-all     - Build kernel selftest'
1539e51d8dacSShuah Khan	@echo  '  kselftest-install - Build and install kernel selftest'
1540dcb825a9SWang Long	@echo  '  kselftest-clean   - Remove all generated kselftest files'
1541e51d8dacSShuah Khan	@echo  '  kselftest-merge   - Merge all the config dependencies of'
1542e51d8dacSShuah Khan	@echo  '		      kselftest to existing .config.'
15435a5da78bSShuah Khan	@echo  ''
154437c8a5faSRob Herring	@$(if $(dtstree), \
154537c8a5faSRob Herring		echo 'Devicetree:'; \
154637c8a5faSRob Herring		echo '* dtbs             - Build device tree blobs for enabled boards'; \
154737c8a5faSRob Herring		echo '  dtbs_install     - Install dtbs to $(INSTALL_DTBS_PATH)'; \
15487aa8dd91SStephen Boyd		echo '  dt_binding_check - Validate device tree binding documents'; \
15497aa8dd91SStephen Boyd		echo '  dtbs_check       - Validate device tree source files';\
155037c8a5faSRob Herring		echo '')
155137c8a5faSRob Herring
155231b8cc80SRandy Dunlap	@echo 'Userspace tools targets:'
155331b8cc80SRandy Dunlap	@echo '  use "make tools/help"'
155431b8cc80SRandy Dunlap	@echo '  or  "cd tools; make help"'
155531b8cc80SRandy Dunlap	@echo  ''
15561da177e4SLinus Torvalds	@echo  'Kernel packaging:'
1557000ec95fSMasahiro Yamada	@$(MAKE) -f $(srctree)/scripts/Makefile.package help
15581da177e4SLinus Torvalds	@echo  ''
15591da177e4SLinus Torvalds	@echo  'Documentation targets:'
1560cb43fb57SMauro Carvalho Chehab	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
15611da177e4SLinus Torvalds	@echo  ''
156201dee188SAndres Salomon	@echo  'Architecture specific targets ($(SRCARCH)):'
15631da177e4SLinus Torvalds	@$(if $(archhelp),$(archhelp),\
156401dee188SAndres Salomon		echo '  No architecture specific help defined for $(SRCARCH)')
15651da177e4SLinus Torvalds	@echo  ''
15661da177e4SLinus Torvalds	@$(if $(boards), \
15671da177e4SLinus Torvalds		$(foreach b, $(boards), \
15684234448bSGeert Uytterhoeven		printf "  %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
15691da177e4SLinus Torvalds		echo '')
15705dffbe81SSegher Boessenkool	@$(if $(board-dirs), \
15715dffbe81SSegher Boessenkool		$(foreach b, $(board-dirs), \
15725dffbe81SSegher Boessenkool		printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
15735dffbe81SSegher Boessenkool		printf "  %-16s - Show all of the above\\n" help-boards; \
15745dffbe81SSegher Boessenkool		echo '')
15751da177e4SLinus Torvalds
15761da177e4SLinus Torvalds	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
157745d506bdSSam Ravnborg	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
15781da177e4SLinus Torvalds	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1579a64c0440SGeert Uytterhoeven	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK'
1580a64c0440SGeert Uytterhoeven	@echo  '                       (sparse by default)'
1581701842e3SDustin Kirkland	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1582af07ce3eSIngo Molnar	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1583e27128dbSMasahiro Yamada	@echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3 where'
158428bc20dcSSam Ravnborg	@echo  '		1: warnings which may be relevant and do not occur too often'
158528bc20dcSSam Ravnborg	@echo  '		2: warnings which occur quite often but may still be relevant'
158628bc20dcSSam Ravnborg	@echo  '		3: more obscure warnings, can most likely be ignored'
1587a6de553dSMichal Marek	@echo  '		Multiple levels can be combined with W=12 or W=123'
15881da177e4SLinus Torvalds	@echo  ''
15891da177e4SLinus Torvalds	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
15901da177e4SLinus Torvalds	@echo  'For further info see the ./README file'
15911da177e4SLinus Torvalds
15921da177e4SLinus Torvalds
15935dffbe81SSegher Boessenkoolhelp-board-dirs := $(addprefix help-,$(board-dirs))
15945dffbe81SSegher Boessenkool
15955dffbe81SSegher Boessenkoolhelp-boards: $(help-board-dirs)
15965dffbe81SSegher Boessenkool
1597fbae4d58SMichal Marekboards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
15985dffbe81SSegher Boessenkool
15995dffbe81SSegher Boessenkool$(help-board-dirs): help-%:
16005dffbe81SSegher Boessenkool	@echo  'Architecture specific targets ($(SRCARCH) $*):'
16015dffbe81SSegher Boessenkool	@$(if $(boards-per-dir), \
16025dffbe81SSegher Boessenkool		$(foreach b, $(boards-per-dir), \
16035dffbe81SSegher Boessenkool		printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
16045dffbe81SSegher Boessenkool		echo '')
16055dffbe81SSegher Boessenkool
16065dffbe81SSegher Boessenkool
16071da177e4SLinus Torvalds# Documentation targets
16081da177e4SLinus Torvalds# ---------------------------------------------------------------------------
1609e8939222SJani NikulaDOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1610e8939222SJani Nikula	       linkcheckdocs dochelp refcheckdocs
161122cba31bSJani NikulaPHONY += $(DOC_TARGETS)
1612bc7b752aSMasahiro Yamada$(DOC_TARGETS):
1613cb43fb57SMauro Carvalho Chehab	$(Q)$(MAKE) $(build)=Documentation $@
16141da177e4SLinus Torvalds
161567274c08SMasahiro Yamada# Misc
161667274c08SMasahiro Yamada# ---------------------------------------------------------------------------
161767274c08SMasahiro Yamada
161867274c08SMasahiro YamadaPHONY += scripts_gdb
16197a739ce5SMasahiro Yamadascripts_gdb: prepare0
16201e5ff84fSMasahiro Yamada	$(Q)$(MAKE) $(build)=scripts/gdb
16218d2e5200SMasahiro Yamada	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
162267274c08SMasahiro Yamada
162367274c08SMasahiro Yamadaifdef CONFIG_GDB_SCRIPTS
162467274c08SMasahiro Yamadaall: scripts_gdb
162567274c08SMasahiro Yamadaendif
162667274c08SMasahiro Yamada
16271da177e4SLinus Torvaldselse # KBUILD_EXTMOD
16281da177e4SLinus Torvalds
16291da177e4SLinus Torvalds###
16301da177e4SLinus Torvalds# External module support.
16311da177e4SLinus Torvalds# When building external modules the kernel used as basis is considered
16321da177e4SLinus Torvalds# read-only, and no consistency checks are made and the make
16331da177e4SLinus Torvalds# system is not used on the basis kernel. If updates are required
16341da177e4SLinus Torvalds# in the basis kernel ordinary make commands (without M=...) must
16351da177e4SLinus Torvalds# be used.
16361da177e4SLinus Torvalds#
16371da177e4SLinus Torvalds# The following are the only valid targets when building external
16381da177e4SLinus Torvalds# modules.
16391da177e4SLinus Torvalds# make M=dir clean     Delete all automatically generated files
16401da177e4SLinus Torvalds# make M=dir modules   Make all modules in specified dir
16411da177e4SLinus Torvalds# make M=dir	       Same as 'make M=dir modules'
16421da177e4SLinus Torvalds# make M=dir modules_install
1643070b98bfSSam Ravnborg#                      Install the modules built in the module directory
16441da177e4SLinus Torvalds#                      Assumes install directory is already created
16451da177e4SLinus Torvalds
16461da177e4SLinus Torvalds# We are always building modules
16471da177e4SLinus TorvaldsKBUILD_MODULES := 1
16481da177e4SLinus Torvalds
16494f193362SPaul SmithPHONY += $(objtree)/Module.symvers
16501da177e4SLinus Torvalds$(objtree)/Module.symvers:
16511da177e4SLinus Torvalds	@test -e $(objtree)/Module.symvers || ( \
16521da177e4SLinus Torvalds	echo; \
16531da177e4SLinus Torvalds	echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
16541da177e4SLinus Torvalds	echo "           is missing; modules will have no dependencies and modversions."; \
16551da177e4SLinus Torvalds	echo )
16561da177e4SLinus Torvalds
1657c99f3918SMasahiro Yamadabuild-dirs := $(KBUILD_EXTMOD)
1658c99f3918SMasahiro YamadaPHONY += modules
1659c99f3918SMasahiro Yamadamodules: descend $(objtree)/Module.symvers
1660b805aa0eSSam Ravnborg	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
16611da177e4SLinus Torvalds
16624f193362SPaul SmithPHONY += modules_install
1663a67dc21aSSam Ravnborgmodules_install: _emodinst_ _emodinst_post
1664a67dc21aSSam Ravnborg
1665a67dc21aSSam Ravnborginstall-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
16664f193362SPaul SmithPHONY += _emodinst_
1667a67dc21aSSam Ravnborg_emodinst_:
1668a67dc21aSSam Ravnborg	$(Q)mkdir -p $(MODLIB)/$(install-dir)
1669b805aa0eSSam Ravnborg	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
16701da177e4SLinus Torvalds
16714f193362SPaul SmithPHONY += _emodinst_post
1672a67dc21aSSam Ravnborg_emodinst_post: _emodinst_
1673a67dc21aSSam Ravnborg	$(call cmd,depmod)
1674a67dc21aSSam Ravnborg
167576cd306dSMasahiro Yamadaclean-dirs := $(KBUILD_EXTMOD)
1676bc35d4bdSMasahiro Yamadaclean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps
16771da177e4SLinus Torvalds
1678fe69b420SMasahiro YamadaPHONY += help
16791da177e4SLinus Torvaldshelp:
16801da177e4SLinus Torvalds	@echo  '  Building external modules.'
16811da177e4SLinus Torvalds	@echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
16821da177e4SLinus Torvalds	@echo  ''
16831da177e4SLinus Torvalds	@echo  '  modules         - default target, build the module(s)'
16841da177e4SLinus Torvalds	@echo  '  modules_install - install the module'
16851da177e4SLinus Torvalds	@echo  '  clean           - remove generated files in module directory only'
16861da177e4SLinus Torvalds	@echo  ''
168706300b21SSam Ravnborg
1688059bc9fcSMasahiro YamadaPHONY += prepare
16891da177e4SLinus Torvaldsendif # KBUILD_EXTMOD
16901da177e4SLinus Torvalds
1691b1fbfcb4SMasahiro Yamada# Single targets
1692b1fbfcb4SMasahiro Yamada# ---------------------------------------------------------------------------
1693b1fbfcb4SMasahiro Yamada# To build individual files in subdirectories, you can do like this:
1694b1fbfcb4SMasahiro Yamada#
1695b1fbfcb4SMasahiro Yamada#   make foo/bar/baz.s
1696b1fbfcb4SMasahiro Yamada#
1697b1fbfcb4SMasahiro Yamada# The supported suffixes for single-target are listed in 'single-targets'
1698b1fbfcb4SMasahiro Yamada#
1699b1fbfcb4SMasahiro Yamada# To build only under specific subdirectories, you can do like this:
1700b1fbfcb4SMasahiro Yamada#
1701b1fbfcb4SMasahiro Yamada#   make foo/bar/baz/
1702b1fbfcb4SMasahiro Yamada
1703b1fbfcb4SMasahiro Yamadaifdef single-build
1704b1fbfcb4SMasahiro Yamada
1705b1fbfcb4SMasahiro Yamada# .ko is special because modpost is needed
1706b1fbfcb4SMasahiro Yamadasingle-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1707b1fbfcb4SMasahiro Yamadasingle-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1708b1fbfcb4SMasahiro Yamada
1709b1fbfcb4SMasahiro Yamada$(single-ko): single_modpost
1710b1fbfcb4SMasahiro Yamada	@:
1711b1fbfcb4SMasahiro Yamada$(single-no-ko): descend
1712b1fbfcb4SMasahiro Yamada	@:
1713b1fbfcb4SMasahiro Yamada
1714b1fbfcb4SMasahiro Yamadaifeq ($(KBUILD_EXTMOD),)
1715b1fbfcb4SMasahiro Yamada# For the single build of in-tree modules, use a temporary file to avoid
1716b1fbfcb4SMasahiro Yamada# the situation of modules_install installing an invalid modules.order.
1717b1fbfcb4SMasahiro YamadaMODORDER := .modules.tmp
1718b1fbfcb4SMasahiro Yamadaendif
1719b1fbfcb4SMasahiro Yamada
1720b1fbfcb4SMasahiro YamadaPHONY += single_modpost
1721b1fbfcb4SMasahiro Yamadasingle_modpost: $(single-no-ko)
1722b1fbfcb4SMasahiro Yamada	$(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1723b1fbfcb4SMasahiro Yamada	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1724b1fbfcb4SMasahiro Yamada
1725b1fbfcb4SMasahiro YamadaKBUILD_MODULES := 1
1726b1fbfcb4SMasahiro Yamada
1727b1fbfcb4SMasahiro Yamadaexport KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
1728b1fbfcb4SMasahiro Yamada
1729b1fbfcb4SMasahiro Yamada# trim unrelated directories
1730b1fbfcb4SMasahiro Yamadabuild-dirs := $(foreach d, $(build-dirs), \
1731b1fbfcb4SMasahiro Yamada			$(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1732b1fbfcb4SMasahiro Yamada
1733b1fbfcb4SMasahiro Yamadaendif
1734b1fbfcb4SMasahiro Yamada
1735b480fec9SMasahiro Yamadaifndef CONFIG_MODULES
1736b480fec9SMasahiro YamadaKBUILD_MODULES :=
1737b480fec9SMasahiro Yamadaendif
1738b480fec9SMasahiro Yamada
1739c99f3918SMasahiro Yamada# Handle descending into subdirectories listed in $(build-dirs)
1740c99f3918SMasahiro Yamada# Preset locale variables to speed up the build process. Limit locale
1741c99f3918SMasahiro Yamada# tweaks to this spot to avoid wrong language settings when running
1742c99f3918SMasahiro Yamada# make menuconfig etc.
1743c99f3918SMasahiro Yamada# Error messages still appears in the original language
1744c99f3918SMasahiro YamadaPHONY += descend $(build-dirs)
1745c99f3918SMasahiro Yamadadescend: $(build-dirs)
1746c99f3918SMasahiro Yamada$(build-dirs): prepare
1747b1fbfcb4SMasahiro Yamada	$(Q)$(MAKE) $(build)=$@ \
1748f566e1fbSMasahiro Yamada	single-build=$(if $(filter-out $@/, $(filter $@/%, $(single-no-ko))),1) \
1749b1fbfcb4SMasahiro Yamada	need-builtin=1 need-modorder=1
1750c99f3918SMasahiro Yamada
175176cd306dSMasahiro Yamadaclean-dirs := $(addprefix _clean_, $(clean-dirs))
175276cd306dSMasahiro YamadaPHONY += $(clean-dirs) clean
175376cd306dSMasahiro Yamada$(clean-dirs):
175476cd306dSMasahiro Yamada	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
175576cd306dSMasahiro Yamada
175688d7be03SMichal Marekclean: $(clean-dirs)
175788d7be03SMichal Marek	$(call cmd,rmfiles)
175843f67c98SKevin Cernekee	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1759ef46d9b3SMasahiro Yamada		\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
17604f0e3a57SRob Herring		-o -name '*.ko.*' \
17614f0e3a57SRob Herring		-o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1762ef46d9b3SMasahiro Yamada		-o -name '*.dwo' -o -name '*.lst' \
1763bbc55bdeSMasahiro Yamada		-o -name '*.su' -o -name '*.mod' \
176488d7be03SMichal Marek		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
17659a8dfb39SMasahiro Yamada		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
17664fa8bc94SMasahiro Yamada		-o -name '*.asn1.[ch]' \
176788d7be03SMichal Marek		-o -name '*.symtypes' -o -name 'modules.order' \
17688b41fc44SMasahiro Yamada		-o -name '.tmp_*.o.*' \
17696b90bd4bSEmese Revfy		-o -name '*.c.[012]*.*' \
1770433db3e2SVinícius Tinti		-o -name '*.ll' \
177188d7be03SMichal Marek		-o -name '*.gcno' \) -type f -print | xargs rm -f
177288d7be03SMichal Marek
17731da177e4SLinus Torvalds# Generate tags for editors
17741da177e4SLinus Torvalds# ---------------------------------------------------------------------------
1775a680eedcSSam Ravnborgquiet_cmd_tags = GEN     $@
1776858805b3SMasahiro Yamada      cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
17771da177e4SLinus Torvalds
1778f4ed1009SJianbin Kangtags TAGS cscope gtags: FORCE
17791da177e4SLinus Torvalds	$(call cmd,tags)
17801da177e4SLinus Torvalds
1781eb8305aeSMatthias Maennich# Script to generate missing namespace dependencies
1782eb8305aeSMatthias Maennich# ---------------------------------------------------------------------------
1783eb8305aeSMatthias Maennich
1784eb8305aeSMatthias MaennichPHONY += nsdeps
1785bff9c62bSMasahiro Yamadansdeps: export KBUILD_NSDEPS=1
1786eb8305aeSMatthias Maennichnsdeps: modules
1787bff9c62bSMasahiro Yamada	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1788eb8305aeSMatthias Maennich
17891da177e4SLinus Torvalds# Scripts to check various things for consistency
17901da177e4SLinus Torvalds# ---------------------------------------------------------------------------
17911da177e4SLinus Torvalds
1792279f3dd3SPeter FoleyPHONY += includecheck versioncheck coccicheck namespacecheck export_report
1793279f3dd3SPeter Foley
17941da177e4SLinus Torvaldsincludecheck:
1795436f876cSPeter Foley	find $(srctree)/* $(RCS_FIND_IGNORE) \
17961da177e4SLinus Torvalds		-name '*.[hcS]' -type f -print | sort \
179780007434SGeert Uytterhoeven		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
17981da177e4SLinus Torvalds
17991da177e4SLinus Torvaldsversioncheck:
18002ee2d292SPeter Foley	find $(srctree)/* $(RCS_FIND_IGNORE) \
18011da177e4SLinus Torvalds		-name '*.[hcS]' -type f -print | sort \
180280007434SGeert Uytterhoeven		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
18031da177e4SLinus Torvalds
180474425eeeSNicolas Palixcoccicheck:
1805858805b3SMasahiro Yamada	$(Q)$(BASH) $(srctree)/scripts/$@
180674425eeeSNicolas Palix
18071da177e4SLinus Torvaldsnamespacecheck:
18081da177e4SLinus Torvalds	$(PERL) $(srctree)/scripts/namespace.pl
18091da177e4SLinus Torvalds
1810295ac051SAdrian Bunkexport_report:
1811295ac051SAdrian Bunk	$(PERL) $(srctree)/scripts/export_report.pl
1812295ac051SAdrian Bunk
1813c398ff00SMike MarciniszynPHONY += checkstack kernelrelease kernelversion image_name
1814e3ccf6e3SJeff Dike
1815011e3a9aSJeff Dike# UML needs a little special treatment here.  It wants to use the host
1816011e3a9aSJeff Dike# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1817011e3a9aSJeff Dike# else wants $(ARCH), including people doing cross-builds, which means
1818011e3a9aSJeff Dike# that $(SUBARCH) doesn't work here.
1819011e3a9aSJeff Dikeifeq ($(ARCH), um)
1820011e3a9aSJeff DikeCHECKSTACK_ARCH := $(SUBARCH)
1821011e3a9aSJeff Dikeelse
1822011e3a9aSJeff DikeCHECKSTACK_ARCH := $(ARCH)
1823011e3a9aSJeff Dikeendif
18241da177e4SLinus Torvaldscheckstack:
18251da177e4SLinus Torvalds	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
182675dd4747SMasahiro Yamada	$(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
18271da177e4SLinus Torvalds
18287b8ea53dSAmerigo Wangkernelrelease:
18297b8ea53dSAmerigo Wang	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
183001ab1788SAmerigo Wang
1831cb58455cSSam Ravnborgkernelversion:
18322244cbd8SSam Ravnborg	@echo $(KERNELVERSION)
18331da177e4SLinus Torvalds
1834c398ff00SMike Marciniszynimage_name:
1835c398ff00SMike Marciniszyn	@echo $(KBUILD_IMAGE)
1836c398ff00SMike Marciniszyn
1837ea01fa9fSBorislav Petkov# Clear a bunch of variables before executing the submake
1838f47a23ceSMasahiro Yamada
1839f47a23ceSMasahiro Yamadaifeq ($(quiet),silent_)
1840f47a23ceSMasahiro Yamadatools_silent=s
1841f47a23ceSMasahiro Yamadaendif
1842f47a23ceSMasahiro Yamada
1843ea01fa9fSBorislav Petkovtools/: FORCE
1844bf35182fSDavid Howells	$(Q)mkdir -p $(objtree)/tools
184575dd4747SMasahiro Yamada	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1846ea01fa9fSBorislav Petkov
1847ea01fa9fSBorislav Petkovtools/%: FORCE
1848bf35182fSDavid Howells	$(Q)mkdir -p $(objtree)/tools
184975dd4747SMasahiro Yamada	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1850ea01fa9fSBorislav Petkov
18511da177e4SLinus Torvaldsquiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
18520663c68cSMasahiro Yamada      cmd_rmfiles = rm -rf $(rm-files)
18531da177e4SLinus Torvalds
1854bc3c26feSUwe Kleine-König# Run depmod only if we have System.map and depmod is executable
185550a8ec31SSam Ravnborgquiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1856569658ddSMichal Marek      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
18575a144a1aSMasahiro Yamada                   $(KERNELRELEASE)
185850a8ec31SSam Ravnborg
1859392885eeSMasahiro Yamada# read saved command lines for existing targets
1860392885eeSMasahiro Yamadaexisting-targets := $(wildcard $(sort $(targets)))
18611da177e4SLinus Torvalds
1862b999923cSMasahiro Yamada-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
18631da177e4SLinus Torvalds
186446b7c492SSZ Lin (林上智)endif # config-build
18652042b548SMasahiro Yamadaendif # mixed-build
1866688931a5SMasahiro Yamadaendif # need-sub-make
18671da177e4SLinus Torvalds
18684f193362SPaul SmithPHONY += FORCE
18691da177e4SLinus TorvaldsFORCE:
18704f193362SPaul Smith
1871bd412d81SUlf Magnusson# Declare the contents of the PHONY variable as phony.  We keep that
1872fe8d0a41SKirill Smelkov# information in a variable so we can use it in if_changed and friends.
18734f193362SPaul Smith.PHONY: $(PHONY)
1874