Makefile revision b2441318
1b2441318SGreg Kroah-Hartman# SPDX-License-Identifier: GPL-2.0
2c517d838SLinus TorvaldsVERSION = 4
32bd6bf03SLinus TorvaldsPATCHLEVEL = 14
455922c9dSLinus TorvaldsSUBLEVEL = 0
5bb176f67SLinus TorvaldsEXTRAVERSION = -rc6
6566cf877SLinus TorvaldsNAME = Fearless Coyote
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
14a436bb7bSMasahiro Yamada# o Do not use make's built-in rules and variables
15a436bb7bSMasahiro Yamada#   (this increases performance and avoids hard-to-debug behaviour);
16a436bb7bSMasahiro Yamada# o Look for make include files relative to root of kernel src
17a436bb7bSMasahiro YamadaMAKEFLAGS += -rR --include-dir=$(CURDIR)
181da177e4SLinus Torvalds
19c051346bSH. Peter Anvin# Avoid funny character set dependencies
2006b5dc64SH. Peter Anvinunexport LC_ALL
21c051346bSH. Peter AnvinLC_COLLATE=C
22c051346bSH. Peter AnvinLC_NUMERIC=C
2307105202SMichal Marekexport LC_COLLATE LC_NUMERIC
24c051346bSH. Peter Anvin
25ab7474eaSBorislav Petkov# Avoid interference with shell env settings
26ab7474eaSBorislav Petkovunexport GREP_OPTIONS
27ab7474eaSBorislav Petkov
281da177e4SLinus Torvalds# We are using a recursive build, so we need to do a little thinking
291da177e4SLinus Torvalds# to get the ordering right.
301da177e4SLinus Torvalds#
311da177e4SLinus Torvalds# Most importantly: sub-Makefiles should only ever modify files in
321da177e4SLinus Torvalds# their own directory. If in some directory we have a dependency on
331da177e4SLinus Torvalds# a file in another dir (which doesn't happen often, but it's often
341da177e4SLinus Torvalds# unavoidable when linking the built-in.o targets which finally
351da177e4SLinus Torvalds# turn into vmlinux), we will call a sub make in that other dir, and
361da177e4SLinus Torvalds# after that we are sure that everything which is in that other dir
371da177e4SLinus Torvalds# is now up to date.
381da177e4SLinus Torvalds#
391da177e4SLinus Torvalds# The only cases where we need to modify files which have global
401da177e4SLinus Torvalds# effects are thus separated out and done before the recursive
411da177e4SLinus Torvalds# descending is started. They are now explicitly listed as the
421da177e4SLinus Torvalds# prepare rule.
431da177e4SLinus Torvalds
44066b7ed9SMichal Marek# Beautify output
45066b7ed9SMichal Marek# ---------------------------------------------------------------------------
46066b7ed9SMichal Marek#
47066b7ed9SMichal Marek# Normally, we echo the whole command before executing it. By making
48066b7ed9SMichal Marek# that echo $($(quiet)$(cmd)), we now have the possibility to set
49066b7ed9SMichal Marek# $(quiet) to choose other forms of output instead, e.g.
50066b7ed9SMichal Marek#
51066b7ed9SMichal Marek#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
52066b7ed9SMichal Marek#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
53066b7ed9SMichal Marek#
54066b7ed9SMichal Marek# If $(quiet) is empty, the whole command will be printed.
55066b7ed9SMichal Marek# If it is set to "quiet_", only the short version will be printed.
56066b7ed9SMichal Marek# If it is set to "silent_", nothing will be printed at all, since
57066b7ed9SMichal Marek# the variable $(silent_cmd_cc_o_c) doesn't exist.
58066b7ed9SMichal Marek#
59066b7ed9SMichal Marek# A simple variant is to prefix commands with $(Q) - that's useful
60066b7ed9SMichal Marek# for commands that shall be hidden in non-verbose mode.
61066b7ed9SMichal Marek#
62066b7ed9SMichal Marek#	$(Q)ln $@ :<
63066b7ed9SMichal Marek#
64066b7ed9SMichal Marek# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
65066b7ed9SMichal Marek# If KBUILD_VERBOSE equals 1 then the above command is displayed.
66066b7ed9SMichal Marek#
671da177e4SLinus Torvalds# To put more focus on warnings, be less verbose as default
681da177e4SLinus Torvalds# Use 'make V=1' to see the full commands
691da177e4SLinus Torvalds
70b8b0618cSCheng Renquanifeq ("$(origin V)", "command line")
71b8b0618cSCheng Renquan  KBUILD_VERBOSE = $(V)
721da177e4SLinus Torvaldsendif
731da177e4SLinus Torvaldsifndef KBUILD_VERBOSE
741da177e4SLinus Torvalds  KBUILD_VERBOSE = 0
751da177e4SLinus Torvaldsendif
761da177e4SLinus Torvalds
77066b7ed9SMichal Marekifeq ($(KBUILD_VERBOSE),1)
78066b7ed9SMichal Marek  quiet =
79066b7ed9SMichal Marek  Q =
80066b7ed9SMichal Marekelse
81066b7ed9SMichal Marek  quiet=quiet_
82066b7ed9SMichal Marek  Q = @
83066b7ed9SMichal Marekendif
84066b7ed9SMichal Marek
85066b7ed9SMichal Marek# If the user is running make -s (silent mode), suppress echoing of
86066b7ed9SMichal Marek# commands
87066b7ed9SMichal Marek
886f0fa58eSMasahiro Yamadaifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
89066b7ed9SMichal Marek  quiet=silent_
90e572d088SJosh Poimboeuf  tools_silent=s
91066b7ed9SMichal Marekendif
92066b7ed9SMichal Marek
93066b7ed9SMichal Marekexport quiet Q KBUILD_VERBOSE
94066b7ed9SMichal Marek
951da177e4SLinus Torvalds# kbuild supports saving output files in a separate directory.
961da177e4SLinus Torvalds# To locate output files in a separate directory two syntaxes are supported.
971da177e4SLinus Torvalds# In both cases the working directory must be the root of the kernel src.
981da177e4SLinus Torvalds# 1) O=
991da177e4SLinus Torvalds# Use "make O=dir/to/store/output/files/"
100070b98bfSSam Ravnborg#
1011da177e4SLinus Torvalds# 2) Set KBUILD_OUTPUT
1021da177e4SLinus Torvalds# Set the environment variable KBUILD_OUTPUT to point to the directory
1031da177e4SLinus Torvalds# where the output files shall be placed.
1041da177e4SLinus Torvalds# export KBUILD_OUTPUT=dir/to/store/output/files/
1051da177e4SLinus Torvalds# make
1061da177e4SLinus Torvalds#
1071da177e4SLinus Torvalds# The O= assignment takes precedence over the KBUILD_OUTPUT environment
1081da177e4SLinus Torvalds# variable.
1091da177e4SLinus Torvalds
110c4e6fff1SCao jin# KBUILD_SRC is not intended to be used by the regular user (for now),
111c4e6fff1SCao jin# it is set on invocation of make with KBUILD_OUTPUT or O= specified.
1121da177e4SLinus Torvaldsifeq ($(KBUILD_SRC),)
1131da177e4SLinus Torvalds
1141da177e4SLinus Torvalds# OK, Make called in directory where kernel src resides
1151da177e4SLinus Torvalds# Do we want to locate output files in a separate directory?
116b8b0618cSCheng Renquanifeq ("$(origin O)", "command line")
117b8b0618cSCheng Renquan  KBUILD_OUTPUT := $(O)
1181da177e4SLinus Torvaldsendif
1191da177e4SLinus Torvalds
1201da177e4SLinus Torvalds# That's our default target when none is given on the command line
1214f193362SPaul SmithPHONY := _all
1221da177e4SLinus Torvalds_all:
1231da177e4SLinus Torvalds
1241cacc9abSSam Ravnborg# Cancel implicit rules on top Makefile
1251cacc9abSSam Ravnborg$(CURDIR)/Makefile Makefile: ;
1261cacc9abSSam Ravnborg
12751193b76SRobert Jarzmikifneq ($(words $(subst :, ,$(CURDIR))), 1)
12851193b76SRobert Jarzmik  $(error main directory cannot contain spaces nor colons)
12951193b76SRobert Jarzmikendif
13051193b76SRobert Jarzmik
1311da177e4SLinus Torvaldsifneq ($(KBUILD_OUTPUT),)
1321da177e4SLinus Torvalds# check that the output directory actually exists
1331da177e4SLinus Torvaldssaved-output := $(KBUILD_OUTPUT)
1348e9b4667SMasahiro Yamada$(shell [ -d $(KBUILD_OUTPUT) ] || mkdir -p $(KBUILD_OUTPUT))
1358e9b4667SMasahiro YamadaKBUILD_OUTPUT := $(realpath $(KBUILD_OUTPUT))
1361da177e4SLinus Torvalds$(if $(KBUILD_OUTPUT),, \
1371c9e70a5SMasahiro Yamada     $(error failed to create output directory "$(saved-output)"))
1381da177e4SLinus Torvalds
1390b35786dSMilton MillerPHONY += $(MAKECMDGOALS) sub-make
1400b35786dSMilton Miller
1411cacc9abSSam Ravnborg$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
14216f89098SCharles Keepax	@:
1430b35786dSMilton Miller
144c4e6fff1SCao jin# Invoke a second make in the output directory, passing relevant variables
1452e8d696bSMasahiro Yamadasub-make:
146745a2543SMasahiro Yamada	$(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
147aa55c8e2SMasahiro Yamada	-f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
1481da177e4SLinus Torvalds
1491da177e4SLinus Torvalds# Leave processing to above invocation of make
1501da177e4SLinus Torvaldsskip-makefile := 1
1511da177e4SLinus Torvaldsendif # ifneq ($(KBUILD_OUTPUT),)
1521da177e4SLinus Torvaldsendif # ifeq ($(KBUILD_SRC),)
1531da177e4SLinus Torvalds
1541da177e4SLinus Torvalds# We process the rest of the Makefile if this is the final invocation of make
1551da177e4SLinus Torvaldsifeq ($(skip-makefile),)
1561da177e4SLinus Torvalds
1577ff52571SMasahiro Yamada# Do not print "Entering directory ...",
1587ff52571SMasahiro Yamada# but we want to display it when entering to the output directory
1597ff52571SMasahiro Yamada# so that IDEs/editors are able to understand relative filenames.
1607ff52571SMasahiro YamadaMAKEFLAGS += --no-print-directory
1617ff52571SMasahiro Yamada
162aa55c8e2SMasahiro Yamada# Call a source code checker (by default, "sparse") as part of the
163aa55c8e2SMasahiro Yamada# C compilation.
164aa55c8e2SMasahiro Yamada#
165aa55c8e2SMasahiro Yamada# Use 'make C=1' to enable checking of only re-compiled files.
166aa55c8e2SMasahiro Yamada# Use 'make C=2' to enable checking of *all* source files, regardless
167aa55c8e2SMasahiro Yamada# of whether they are re-compiled or not.
168aa55c8e2SMasahiro Yamada#
169036db11cSCao jin# See the file "Documentation/dev-tools/sparse.rst" for more details,
170036db11cSCao jin# including where to get the "sparse" utility.
171aa55c8e2SMasahiro Yamada
172aa55c8e2SMasahiro Yamadaifeq ("$(origin C)", "command line")
173aa55c8e2SMasahiro Yamada  KBUILD_CHECKSRC = $(C)
174aa55c8e2SMasahiro Yamadaendif
175aa55c8e2SMasahiro Yamadaifndef KBUILD_CHECKSRC
176aa55c8e2SMasahiro Yamada  KBUILD_CHECKSRC = 0
177aa55c8e2SMasahiro Yamadaendif
178aa55c8e2SMasahiro Yamada
179aa55c8e2SMasahiro Yamada# Use make M=dir to specify directory of external module to build
180aa55c8e2SMasahiro Yamada# Old syntax make ... SUBDIRS=$PWD is still supported
181aa55c8e2SMasahiro Yamada# Setting the environment variable KBUILD_EXTMOD take precedence
182aa55c8e2SMasahiro Yamadaifdef SUBDIRS
183aa55c8e2SMasahiro Yamada  KBUILD_EXTMOD ?= $(SUBDIRS)
184aa55c8e2SMasahiro Yamadaendif
185aa55c8e2SMasahiro Yamada
186aa55c8e2SMasahiro Yamadaifeq ("$(origin M)", "command line")
187aa55c8e2SMasahiro Yamada  KBUILD_EXTMOD := $(M)
188aa55c8e2SMasahiro Yamadaendif
189aa55c8e2SMasahiro Yamada
1901da177e4SLinus Torvalds# If building an external module we do not care about the all: rule
1911da177e4SLinus Torvalds# but instead _all depend on modules
1924f193362SPaul SmithPHONY += all
1931da177e4SLinus Torvaldsifeq ($(KBUILD_EXTMOD),)
1941da177e4SLinus Torvalds_all: all
1951da177e4SLinus Torvaldselse
1961da177e4SLinus Torvalds_all: modules
1971da177e4SLinus Torvaldsendif
1981da177e4SLinus Torvalds
1999da0763bSMichal Marekifeq ($(KBUILD_SRC),)
2009da0763bSMichal Marek        # building in the source tree
2019da0763bSMichal Marek        srctree := .
2029da0763bSMichal Marekelse
2039da0763bSMichal Marek        ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
2049da0763bSMichal Marek                # building in a subdirectory of the source tree
2059da0763bSMichal Marek                srctree := ..
2069da0763bSMichal Marek        else
2079da0763bSMichal Marek                srctree := $(KBUILD_SRC)
2089da0763bSMichal Marek        endif
2099da0763bSMichal Marekendif
2107e1c0477SMichal Marekobjtree		:= .
2111da177e4SLinus Torvaldssrc		:= $(srctree)
2121da177e4SLinus Torvaldsobj		:= $(objtree)
2131da177e4SLinus Torvalds
2140f558c33SMattia DongiliVPATH		:= $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
2151da177e4SLinus Torvalds
21611294235SAmerigo Wangexport srctree objtree VPATH
2171da177e4SLinus Torvalds
2181da177e4SLinus Torvalds# SUBARCH tells the usermode build what the underlying arch is.  That is set
2191da177e4SLinus Torvalds# first, and if a usermode build is happening, the "ARCH=um" on the command
2201da177e4SLinus Torvalds# line overrides the setting of ARCH below.  If a native build is happening,
22138385f8fSMasahiro Yamada# then ARCH is assigned, getting whatever value it gets normally, and
2221da177e4SLinus Torvalds# SUBARCH is subsequently ignored.
2231da177e4SLinus Torvalds
224ffee0de4SDavid WoodhouseSUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
225ffee0de4SDavid Woodhouse				  -e s/sun4u/sparc64/ \
2261da177e4SLinus Torvalds				  -e s/arm.*/arm/ -e s/sa110/arm/ \
22739990b5eSLinus Torvalds				  -e s/s390x/s390/ -e s/parisc64/parisc/ \
228236b1957SPaul Mundt				  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
229f1b99392SWill Deacon				  -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
2301da177e4SLinus Torvalds
2311da177e4SLinus Torvalds# Cross compiling and selecting different set of gcc/bin-utils
2321da177e4SLinus Torvalds# ---------------------------------------------------------------------------
2331da177e4SLinus Torvalds#
2341da177e4SLinus Torvalds# When performing cross compilation for other architectures ARCH shall be set
2351da177e4SLinus Torvalds# to the target architecture. (See arch/* for the possibilities).
2361da177e4SLinus Torvalds# ARCH can be set during invocation of make:
2371da177e4SLinus Torvalds# make ARCH=ia64
2381da177e4SLinus Torvalds# Another way is to have ARCH set in the environment.
2391da177e4SLinus Torvalds# The default ARCH is the host where make is executed.
2401da177e4SLinus Torvalds
2411da177e4SLinus Torvalds# CROSS_COMPILE specify the prefix used for all executables used
2421da177e4SLinus Torvalds# during compilation. Only gcc and related bin-utils executables
2431da177e4SLinus Torvalds# are prefixed with $(CROSS_COMPILE).
2441da177e4SLinus Torvalds# CROSS_COMPILE can be set on the command line
2451da177e4SLinus Torvalds# make CROSS_COMPILE=ia64-linux-
2461da177e4SLinus Torvalds# Alternatively CROSS_COMPILE can be set in the environment.
24784336466SRoland McGrath# A third alternative is to store a setting in .config so that plain
24884336466SRoland McGrath# "make" in the configured kernel build directory always uses that.
2491da177e4SLinus Torvalds# Default value for CROSS_COMPILE is not to prefix executables
2501da177e4SLinus Torvalds# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
2512331d1a6SSam RavnborgARCH		?= $(SUBARCH)
25284336466SRoland McGrathCROSS_COMPILE	?= $(CONFIG_CROSS_COMPILE:"%"=%)
2531da177e4SLinus Torvalds
2541da177e4SLinus Torvalds# Architecture as present in compile.h
2556752ed90SThomas GleixnerUTS_MACHINE 	:= $(ARCH)
2566752ed90SThomas GleixnerSRCARCH 	:= $(ARCH)
2571da177e4SLinus Torvalds
258d746d647SSam Ravnborg# Additional ARCH settings for x86
259d746d647SSam Ravnborgifeq ($(ARCH),i386)
260d746d647SSam Ravnborg        SRCARCH := x86
261d746d647SSam Ravnborgendif
262d746d647SSam Ravnborgifeq ($(ARCH),x86_64)
263d746d647SSam Ravnborg        SRCARCH := x86
264d746d647SSam Ravnborgendif
26574b469f2SSam Ravnborg
2665e538790SSam Ravnborg# Additional ARCH settings for sparc
267e69f58c0SNamhyung Kimifeq ($(ARCH),sparc32)
268e69f58c0SNamhyung Kim       SRCARCH := sparc
269e69f58c0SNamhyung Kimendif
270a439fe51SSam Ravnborgifeq ($(ARCH),sparc64)
2715e538790SSam Ravnborg       SRCARCH := sparc
272a439fe51SSam Ravnborgendif
2732fb9b1bdSSam Ravnborg
2743cc000b5SPaul Mundt# Additional ARCH settings for sh
2753cc000b5SPaul Mundtifeq ($(ARCH),sh64)
2763cc000b5SPaul Mundt       SRCARCH := sh
2773cc000b5SPaul Mundtendif
2783cc000b5SPaul Mundt
27918aecc2bSChris Metcalf# Additional ARCH settings for tile
2806738d321SChris Metcalfifeq ($(ARCH),tilepro)
2816738d321SChris Metcalf       SRCARCH := tile
2826738d321SChris Metcalfendif
28318aecc2bSChris Metcalfifeq ($(ARCH),tilegx)
28418aecc2bSChris Metcalf       SRCARCH := tile
28518aecc2bSChris Metcalfendif
28618aecc2bSChris Metcalf
2875e538790SSam Ravnborg# Where to locate arch specific headers
2885e538790SSam Ravnborghdr-arch  := $(SRCARCH)
2895e538790SSam Ravnborg
29014cdd3c4SRoman ZippelKCONFIG_CONFIG	?= .config
29141263fc6SBen Gardinerexport KCONFIG_CONFIG
29214cdd3c4SRoman Zippel
2931da177e4SLinus Torvalds# SHELL used by kbuild
2941da177e4SLinus TorvaldsCONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
2951da177e4SLinus Torvalds	  else if [ -x /bin/bash ]; then echo /bin/bash; \
2961da177e4SLinus Torvalds	  else echo sh; fi ; fi)
2971da177e4SLinus Torvalds
298d7f14c66SUwe Kleine-KönigHOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS)
299d7f14c66SUwe Kleine-KönigHOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS)
300d7f14c66SUwe Kleine-KönigHOST_LFS_LIBS := $(shell getconf LFS_LIBS)
301d7f14c66SUwe Kleine-König
302070b98bfSSam RavnborgHOSTCC       = gcc
303070b98bfSSam RavnborgHOSTCXX      = g++
304d7f14c66SUwe Kleine-KönigHOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
305d7f14c66SUwe Kleine-König		-fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS)
306d7f14c66SUwe Kleine-KönigHOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)
307d7f14c66SUwe Kleine-KönigHOSTLDFLAGS  := $(HOST_LFS_LDFLAGS)
308d7f14c66SUwe Kleine-KönigHOST_LOADLIBES := $(HOST_LFS_LIBS)
3091da177e4SLinus Torvalds
31061163efaSBehan Websterifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
31161163efaSBehan WebsterHOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
31261163efaSBehan Webster		-Wno-missing-field-initializers -fno-delete-null-pointer-checks
31361163efaSBehan Websterendif
31461163efaSBehan Webster
315070b98bfSSam Ravnborg# Decide whether to build built-in, modular, or both.
316070b98bfSSam Ravnborg# Normally, just do built-in.
3171da177e4SLinus Torvalds
3181da177e4SLinus TorvaldsKBUILD_MODULES :=
3191da177e4SLinus TorvaldsKBUILD_BUILTIN := 1
3201da177e4SLinus Torvalds
3213fbb43dfSMasahiro Yamada# If we have only "make modules", don't compile built-in objects.
3223fbb43dfSMasahiro Yamada# When we're building modules with modversions, we need to consider
3233fbb43dfSMasahiro Yamada# the built-in objects during the descend as well, in order to
3243fbb43dfSMasahiro Yamada# make sure the checksums are up to date before we record them.
3251da177e4SLinus Torvalds
3261da177e4SLinus Torvaldsifeq ($(MAKECMDGOALS),modules)
3271da177e4SLinus Torvalds  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
3281da177e4SLinus Torvaldsendif
3291da177e4SLinus Torvalds
3303fbb43dfSMasahiro Yamada# If we have "make <whatever> modules", compile modules
3313fbb43dfSMasahiro Yamada# in addition to whatever we do anyway.
3323fbb43dfSMasahiro Yamada# Just "make" or "make all" shall build modules as well
3331da177e4SLinus Torvalds
3341da177e4SLinus Torvaldsifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
3351da177e4SLinus Torvalds  KBUILD_MODULES := 1
3361da177e4SLinus Torvaldsendif
3371da177e4SLinus Torvalds
3381da177e4SLinus Torvaldsifeq ($(MAKECMDGOALS),)
3391da177e4SLinus Torvalds  KBUILD_MODULES := 1
3401da177e4SLinus Torvaldsendif
3411da177e4SLinus Torvalds
342e579d351SSam Ravnborgexport KBUILD_MODULES KBUILD_BUILTIN
3431da177e4SLinus Torvaldsexport KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
3441da177e4SLinus Torvalds
3451cacc9abSSam Ravnborg# We need some generic definitions (do not try to remake the file).
346a436bb7bSMasahiro Yamadascripts/Kbuild.include: ;
347a436bb7bSMasahiro Yamadainclude scripts/Kbuild.include
3481da177e4SLinus Torvalds
3491da177e4SLinus Torvalds# Make variables (CC, etc...)
3501da177e4SLinus TorvaldsAS		= $(CROSS_COMPILE)as
3511da177e4SLinus TorvaldsLD		= $(CROSS_COMPILE)ld
3521da177e4SLinus TorvaldsCC		= $(CROSS_COMPILE)gcc
3531da177e4SLinus TorvaldsCPP		= $(CC) -E
3541da177e4SLinus TorvaldsAR		= $(CROSS_COMPILE)ar
3551da177e4SLinus TorvaldsNM		= $(CROSS_COMPILE)nm
3561da177e4SLinus TorvaldsSTRIP		= $(CROSS_COMPILE)strip
3571da177e4SLinus TorvaldsOBJCOPY		= $(CROSS_COMPILE)objcopy
3581da177e4SLinus TorvaldsOBJDUMP		= $(CROSS_COMPILE)objdump
3591da177e4SLinus TorvaldsAWK		= awk
3601da177e4SLinus TorvaldsGENKSYMS	= scripts/genksyms/genksyms
361caa27b66SSam RavnborgINSTALLKERNEL  := installkernel
3621da177e4SLinus TorvaldsDEPMOD		= /sbin/depmod
3631da177e4SLinus TorvaldsPERL		= perl
364011bf125SMasahiro YamadaPYTHON		= python
3651da177e4SLinus TorvaldsCHECK		= sparse
3661da177e4SLinus Torvalds
36780a7d1d9SHannes EderCHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
36880a7d1d9SHannes Eder		  -Wbitwise -Wno-return-void $(CF)
369b36fad65SMichal MarekNOSTDINC_FLAGS  =
3706588169dSSam RavnborgCFLAGS_MODULE   =
3716588169dSSam RavnborgAFLAGS_MODULE   =
3726588169dSSam RavnborgLDFLAGS_MODULE  =
3731da177e4SLinus TorvaldsCFLAGS_KERNEL	=
3741da177e4SLinus TorvaldsAFLAGS_KERNEL	=
375b36fad65SMichal MarekLDFLAGS_vmlinux =
376b334e19aSArnd BergmannCFLAGS_GCOV	:= -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
377543c37cbSEmese RevfyCFLAGS_KCOV	:= $(call cc-option,-fsanitize-coverage=trace-pc,)
3781da177e4SLinus Torvalds
3791da177e4SLinus Torvalds
380abbf1590SDavid Howells# Use USERINCLUDE when you must reference the UAPI directories only.
381abbf1590SDavid HowellsUSERINCLUDE    := \
382abbf1590SDavid Howells		-I$(srctree)/arch/$(hdr-arch)/include/uapi \
3833308b285SArnd Bergmann		-I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
384abbf1590SDavid Howells		-I$(srctree)/include/uapi \
3853308b285SArnd Bergmann		-I$(objtree)/include/generated/uapi \
386abbf1590SDavid Howells                -include $(srctree)/include/linux/kconfig.h
387abbf1590SDavid Howells
3881da177e4SLinus Torvalds# Use LINUXINCLUDE when you must reference the include/ directory.
3891da177e4SLinus Torvalds# Needed to be compatible with the O= option
390abbf1590SDavid HowellsLINUXINCLUDE    := \
391abbf1590SDavid Howells		-I$(srctree)/arch/$(hdr-arch)/include \
3923308b285SArnd Bergmann		-I$(objtree)/arch/$(hdr-arch)/include/generated \
393abbf1590SDavid Howells		$(if $(KBUILD_SRC), -I$(srctree)/include) \
394f8224f7fSMasahiro Yamada		-I$(objtree)/include \
395f8224f7fSMasahiro Yamada		$(USERINCLUDE)
3961da177e4SLinus Torvalds
397d8672b40SSam RavnborgKBUILD_CPPFLAGS := -D__KERNEL__
3981da177e4SLinus Torvalds
399a0f97e06SSam RavnborgKBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
4008c97023cSArnd Bergmann		   -fno-strict-aliasing -fno-common -fshort-wchar \
401a8735821SFloris Kraak		   -Werror-implicit-function-declaration \
40251b97e35SKirill A. Shutemov		   -Wno-format-security \
403c6a38553SBorislav Petkov		   -std=gnu89 $(call cc-option,-fno-PIE)
404c6a38553SBorislav Petkov
405a1c48bb1SGeert Uytterhoeven
40680c00ba9SSam RavnborgKBUILD_AFLAGS_KERNEL :=
40780c00ba9SSam RavnborgKBUILD_CFLAGS_KERNEL :=
408c6a38553SBorislav PetkovKBUILD_AFLAGS   := -D__ASSEMBLY__ $(call cc-option,-fno-PIE)
4096588169dSSam RavnborgKBUILD_AFLAGS_MODULE  := -DMODULE
4106588169dSSam RavnborgKBUILD_CFLAGS_MODULE  := -DMODULE
4116588169dSSam RavnborgKBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
4121da177e4SLinus Torvalds
413f1d28fb0SRoman Zippel# Read KERNELRELEASE from include/config/kernel.release (if it exists)
414f1d28fb0SRoman ZippelKERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
415cacd54efSMichal MarekKERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
416cb58455cSSam Ravnborg
417070b98bfSSam Ravnborgexport VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
41880ef88d6SSam Ravnborgexport ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
419d7f14c66SUwe Kleine-Königexport CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
420011bf125SMasahiro Yamadaexport MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
421070b98bfSSam Ravnborgexport HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
4221da177e4SLinus Torvalds
42306c5040cSSam Ravnborgexport KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
4245c9a8750SDmitry Vyukovexport KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
425222d394dSSam Ravnborgexport KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
4266588169dSSam Ravnborgexport KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
42780c00ba9SSam Ravnborgexport KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
42840df759eSMichal Marekexport KBUILD_ARFLAGS
4291da177e4SLinus Torvalds
4301da177e4SLinus Torvalds# When compiling out-of-tree modules, put MODVERDIR in the module
4311da177e4SLinus Torvalds# tree rather than in the kernel tree. The kernel tree might
4321da177e4SLinus Torvalds# even be read-only.
4331da177e4SLinus Torvaldsexport MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
4341da177e4SLinus Torvalds
4351da177e4SLinus Torvalds# Files to ignore in find ... statements
4361da177e4SLinus Torvalds
437ae63b2d7SPrarit Bhargavaexport RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
438ae63b2d7SPrarit Bhargava			  -name CVS -o -name .pc -o -name .hg -o -name .git \) \
439ae63b2d7SPrarit Bhargava			  -prune -o
440450c6076SJesper Juhlexport RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
441450c6076SJesper Juhl			 --exclude CVS --exclude .pc --exclude .hg --exclude .git
4421da177e4SLinus Torvalds
4431da177e4SLinus Torvalds# ===========================================================================
4441da177e4SLinus Torvalds# Rules shared between *config targets and build targets
4451da177e4SLinus Torvalds
446312a3d09SCao jin# Basic helpers built in scripts/basic/
4474f193362SPaul SmithPHONY += scripts_basic
4481da177e4SLinus Torvaldsscripts_basic:
4491da177e4SLinus Torvalds	$(Q)$(MAKE) $(build)=scripts/basic
450638adb05SSteven Rostedt	$(Q)rm -f .tmp_quiet_recordmcount
4511da177e4SLinus Torvalds
452cd05e6bdSJan Beulich# To avoid any implicit rule to kick in, define an empty command.
453cd05e6bdSJan Beulichscripts/basic/%: scripts_basic ;
454cd05e6bdSJan Beulich
4554f193362SPaul SmithPHONY += outputmakefile
456fd5f0cd6SJan Beulich# outputmakefile generates a Makefile in the output directory, if using a
457fd5f0cd6SJan Beulich# separate output directory. This allows convenient use of make in the
458fd5f0cd6SJan Beulich# output directory.
4591da177e4SLinus Torvaldsoutputmakefile:
460fd5f0cd6SJan Beulichifneq ($(KBUILD_SRC),)
46192979997SAndi Kleen	$(Q)ln -fsn $(srctree) source
462fd5f0cd6SJan Beulich	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
463fd5f0cd6SJan Beulich	    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
464fd5f0cd6SJan Beulichendif
4651da177e4SLinus Torvalds
466d8ecc5cdSSam Ravnborg# Support for using generic headers in asm-generic
467a9d9a400SMasahiro YamadaPHONY += asm-generic uapi-asm-generic
468a9d9a400SMasahiro Yamadaasm-generic: uapi-asm-generic
469d8ecc5cdSSam Ravnborg	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
4703c5994c8SCatalin Marinas	            src=asm obj=arch/$(SRCARCH)/include/generated/asm
471a9d9a400SMasahiro Yamadauapi-asm-generic:
4723c5994c8SCatalin Marinas	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
4733c5994c8SCatalin Marinas	            src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
474d8ecc5cdSSam Ravnborg
4751da177e4SLinus Torvalds# To make sure we do not include .config for any of the *config targets
4761da177e4SLinus Torvalds# catch them early, and hand them over to scripts/kconfig/Makefile
4771da177e4SLinus Torvalds# It is allowed to specify more targets when calling make, including
4781da177e4SLinus Torvalds# mixing *config targets and build targets.
479070b98bfSSam Ravnborg# For example 'make oldconfig all'.
4801da177e4SLinus Torvalds# Detect when mixed targets is specified, and make a second invocation
4811da177e4SLinus Torvalds# of make so .config is not included in this case either (for *config).
4821da177e4SLinus Torvalds
48310b63956SDavid Howellsversion_h := include/generated/uapi/linux/version.h
484223c24a7SMichal Marekold_version_h := include/linux/version.h
485d183e6f5SDavid Howells
4863eb3c740SRoman Zippelno-dot-config-targets := clean mrproper distclean \
487fbae4d58SMichal Marek			 cscope gtags TAGS tags help% %docs check% coccicheck \
488d183e6f5SDavid Howells			 $(version_h) headers_% archheaders archscripts \
4894aed2fd8SLinus Torvalds			 kernelversion %src-pkg
4901da177e4SLinus Torvalds
4911da177e4SLinus Torvaldsconfig-targets := 0
4921da177e4SLinus Torvaldsmixed-targets  := 0
4931da177e4SLinus Torvaldsdot-config     := 1
4941da177e4SLinus Torvalds
4951da177e4SLinus Torvaldsifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
4961da177e4SLinus Torvalds	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
4971da177e4SLinus Torvalds		dot-config := 0
4981da177e4SLinus Torvalds	endif
4991da177e4SLinus Torvaldsendif
5001da177e4SLinus Torvalds
5011da177e4SLinus Torvaldsifeq ($(KBUILD_EXTMOD),)
5021da177e4SLinus Torvalds        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
5031da177e4SLinus Torvalds                config-targets := 1
504