xref: /openbmc/linux/Makefile (revision 7ff52571)
155922c9dSLinus TorvaldsVERSION = 3
27d1311b9SLinus TorvaldsPATCHLEVEL = 17
355922c9dSLinus TorvaldsSUBLEVEL = 0
47d1311b9SLinus TorvaldsEXTRAVERSION = -rc1
538dbfb59SLinus TorvaldsNAME = Shuffling Zombie Juror
61da177e4SLinus Torvalds
71da177e4SLinus Torvalds# *DOCUMENTATION*
81da177e4SLinus Torvalds# To see a list of typical targets execute "make help"
91da177e4SLinus Torvalds# More info can be located in ./README
101da177e4SLinus Torvalds# Comments in this file are targeted only to the developer, do not
111da177e4SLinus Torvalds# expect to learn how to build the kernel reading this file.
121da177e4SLinus Torvalds
13*7ff52571SMasahiro Yamada# Do not use make's built-in rules and variables
14d384e35aSLinus Nilsson# (this increases performance and avoids hard-to-debug behaviour);
15*7ff52571SMasahiro YamadaMAKEFLAGS += -rR
161da177e4SLinus Torvalds
17c051346bSH. Peter Anvin# Avoid funny character set dependencies
1806b5dc64SH. Peter Anvinunexport LC_ALL
19c051346bSH. Peter AnvinLC_COLLATE=C
20c051346bSH. Peter AnvinLC_NUMERIC=C
2107105202SMichal Marekexport LC_COLLATE LC_NUMERIC
22c051346bSH. Peter Anvin
23ab7474eaSBorislav Petkov# Avoid interference with shell env settings
24ab7474eaSBorislav Petkovunexport GREP_OPTIONS
25ab7474eaSBorislav Petkov
261da177e4SLinus Torvalds# We are using a recursive build, so we need to do a little thinking
271da177e4SLinus Torvalds# to get the ordering right.
281da177e4SLinus Torvalds#
291da177e4SLinus Torvalds# Most importantly: sub-Makefiles should only ever modify files in
301da177e4SLinus Torvalds# their own directory. If in some directory we have a dependency on
311da177e4SLinus Torvalds# a file in another dir (which doesn't happen often, but it's often
321da177e4SLinus Torvalds# unavoidable when linking the built-in.o targets which finally
331da177e4SLinus Torvalds# turn into vmlinux), we will call a sub make in that other dir, and
341da177e4SLinus Torvalds# after that we are sure that everything which is in that other dir
351da177e4SLinus Torvalds# is now up to date.
361da177e4SLinus Torvalds#
371da177e4SLinus Torvalds# The only cases where we need to modify files which have global
381da177e4SLinus Torvalds# effects are thus separated out and done before the recursive
391da177e4SLinus Torvalds# descending is started. They are now explicitly listed as the
401da177e4SLinus Torvalds# prepare rule.
411da177e4SLinus Torvalds
42066b7ed9SMichal Marek# Beautify output
43066b7ed9SMichal Marek# ---------------------------------------------------------------------------
44066b7ed9SMichal Marek#
45066b7ed9SMichal Marek# Normally, we echo the whole command before executing it. By making
46066b7ed9SMichal Marek# that echo $($(quiet)$(cmd)), we now have the possibility to set
47066b7ed9SMichal Marek# $(quiet) to choose other forms of output instead, e.g.
48066b7ed9SMichal Marek#
49066b7ed9SMichal Marek#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
50066b7ed9SMichal Marek#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
51066b7ed9SMichal Marek#
52066b7ed9SMichal Marek# If $(quiet) is empty, the whole command will be printed.
53066b7ed9SMichal Marek# If it is set to "quiet_", only the short version will be printed.
54066b7ed9SMichal Marek# If it is set to "silent_", nothing will be printed at all, since
55066b7ed9SMichal Marek# the variable $(silent_cmd_cc_o_c) doesn't exist.
56066b7ed9SMichal Marek#
57066b7ed9SMichal Marek# A simple variant is to prefix commands with $(Q) - that's useful
58066b7ed9SMichal Marek# for commands that shall be hidden in non-verbose mode.
59066b7ed9SMichal Marek#
60066b7ed9SMichal Marek#	$(Q)ln $@ :<
61066b7ed9SMichal Marek#
62066b7ed9SMichal Marek# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
63066b7ed9SMichal Marek# If KBUILD_VERBOSE equals 1 then the above command is displayed.
64066b7ed9SMichal Marek#
651da177e4SLinus Torvalds# To put more focus on warnings, be less verbose as default
661da177e4SLinus Torvalds# Use 'make V=1' to see the full commands
671da177e4SLinus Torvalds
681da177e4SLinus Torvaldsifeq ("$(origin V)", "command line")
691da177e4SLinus Torvalds  KBUILD_VERBOSE = $(V)
701da177e4SLinus Torvaldsendif
711da177e4SLinus Torvaldsifndef KBUILD_VERBOSE
721da177e4SLinus Torvalds  KBUILD_VERBOSE = 0
731da177e4SLinus Torvaldsendif
741da177e4SLinus Torvalds
75066b7ed9SMichal Marekifeq ($(KBUILD_VERBOSE),1)
76066b7ed9SMichal Marek  quiet =
77066b7ed9SMichal Marek  Q =
78066b7ed9SMichal Marekelse
79066b7ed9SMichal Marek  quiet=quiet_
80066b7ed9SMichal Marek  Q = @
81066b7ed9SMichal Marekendif
82066b7ed9SMichal Marek
83066b7ed9SMichal Marek# If the user is running make -s (silent mode), suppress echoing of
84066b7ed9SMichal Marek# commands
85066b7ed9SMichal Marek
86066b7ed9SMichal Marekifneq ($(filter 4.%,$(MAKE_VERSION)),)	# make-4
87066b7ed9SMichal Marekifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
88066b7ed9SMichal Marek  quiet=silent_
89066b7ed9SMichal Marekendif
90066b7ed9SMichal Marekelse					# make-3.8x
91066b7ed9SMichal Marekifneq ($(filter s% -s%,$(MAKEFLAGS)),)
92066b7ed9SMichal Marek  quiet=silent_
93066b7ed9SMichal Marekendif
94066b7ed9SMichal Marekendif
95066b7ed9SMichal Marek
96066b7ed9SMichal Marekexport quiet Q KBUILD_VERBOSE
97066b7ed9SMichal Marek
981c7bafe7SRobert P. J. Day# Call a source code checker (by default, "sparse") as part of the
991c7bafe7SRobert P. J. Day# C compilation.
1001c7bafe7SRobert P. J. Day#
1011c7bafe7SRobert P. J. Day# Use 'make C=1' to enable checking of only re-compiled files.
1021c7bafe7SRobert P. J. Day# Use 'make C=2' to enable checking of *all* source files, regardless
1031c7bafe7SRobert P. J. Day# of whether they are re-compiled or not.
1041c7bafe7SRobert P. J. Day#
1051c7bafe7SRobert P. J. Day# See the file "Documentation/sparse.txt" for more details, including
1061c7bafe7SRobert P. J. Day# where to get the "sparse" utility.
1071da177e4SLinus Torvalds
1081da177e4SLinus Torvaldsifeq ("$(origin C)", "command line")
1091da177e4SLinus Torvalds  KBUILD_CHECKSRC = $(C)
1101da177e4SLinus Torvaldsendif
1111da177e4SLinus Torvaldsifndef KBUILD_CHECKSRC
1121da177e4SLinus Torvalds  KBUILD_CHECKSRC = 0
1131da177e4SLinus Torvaldsendif
1141da177e4SLinus Torvalds
1151da177e4SLinus Torvalds# Use make M=dir to specify directory of external module to build
1161da177e4SLinus Torvalds# Old syntax make ... SUBDIRS=$PWD is still supported
1171da177e4SLinus Torvalds# Setting the environment variable KBUILD_EXTMOD take precedence
1181da177e4SLinus Torvaldsifdef SUBDIRS
1191da177e4SLinus Torvalds  KBUILD_EXTMOD ?= $(SUBDIRS)
1201da177e4SLinus Torvaldsendif
121b8b0618cSCheng Renquan
1221da177e4SLinus Torvaldsifeq ("$(origin M)", "command line")
1231da177e4SLinus Torvalds  KBUILD_EXTMOD := $(M)
1241da177e4SLinus Torvaldsendif
1251da177e4SLinus Torvalds
1261da177e4SLinus Torvalds# kbuild supports saving output files in a separate directory.
1271da177e4SLinus Torvalds# To locate output files in a separate directory two syntaxes are supported.
1281da177e4SLinus Torvalds# In both cases the working directory must be the root of the kernel src.
1291da177e4SLinus Torvalds# 1) O=
1301da177e4SLinus Torvalds# Use "make O=dir/to/store/output/files/"
1311da177e4SLinus Torvalds#
1321da177e4SLinus Torvalds# 2) Set KBUILD_OUTPUT
1331da177e4SLinus Torvalds# Set the environment variable KBUILD_OUTPUT to point to the directory
1341da177e4SLinus Torvalds# where the output files shall be placed.
1351da177e4SLinus Torvalds# export KBUILD_OUTPUT=dir/to/store/output/files/
1361da177e4SLinus Torvalds# make
1371da177e4SLinus Torvalds#
1381da177e4SLinus Torvalds# The O= assignment takes precedence over the KBUILD_OUTPUT environment
1391da177e4SLinus Torvalds# variable.
1401da177e4SLinus Torvalds
1411da177e4SLinus Torvalds
1421da177e4SLinus Torvalds# KBUILD_SRC is set on invocation of make in OBJ directory
1431da177e4SLinus Torvalds# KBUILD_SRC is not intended to be used by the regular user (for now)
1441da177e4SLinus Torvaldsifeq ($(KBUILD_SRC),)
1451da177e4SLinus Torvalds
1461da177e4SLinus Torvalds# OK, Make called in directory where kernel src resides
1471da177e4SLinus Torvalds# Do we want to locate output files in a separate directory?
1481da177e4SLinus Torvaldsifeq ("$(origin O)", "command line")
1491da177e4SLinus Torvalds  KBUILD_OUTPUT := $(O)
1501da177e4SLinus Torvaldsendif
1511da177e4SLinus Torvalds
1521da177e4SLinus Torvalds# That's our default target when none is given on the command line
1534f193362SPaul SmithPHONY := _all
1541da177e4SLinus Torvalds_all:
1551da177e4SLinus Torvalds
1561cacc9abSSam Ravnborg# Cancel implicit rules on top Makefile
1571cacc9abSSam Ravnborg$(CURDIR)/Makefile Makefile: ;
1581cacc9abSSam Ravnborg
1591da177e4SLinus Torvaldsifneq ($(KBUILD_OUTPUT),)
1601da177e4SLinus Torvalds# Invoke a second make in the output directory, passing relevant variables
1611da177e4SLinus Torvalds# check that the output directory actually exists
1621da177e4SLinus Torvaldssaved-output := $(KBUILD_OUTPUT)
1631c9e70a5SMasahiro YamadaKBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
1641c9e70a5SMasahiro Yamada								&& /bin/pwd)
1651da177e4SLinus Torvalds$(if $(KBUILD_OUTPUT),, \
1661c9e70a5SMasahiro Yamada     $(error failed to create output directory "$(saved-output)"))
1671da177e4SLinus Torvalds
1680b35786dSMilton MillerPHONY += $(MAKECMDGOALS) sub-make
1690b35786dSMilton Miller
1701cacc9abSSam Ravnborg$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
17116f89098SCharles Keepax	@:
1720b35786dSMilton Miller
1730b35786dSMilton Millersub-make: FORCE
1741da177e4SLinus Torvalds	$(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
17523a45e2cSSam Ravnborg	KBUILD_SRC=$(CURDIR) \
1760b35786dSMilton Miller	KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
1770b35786dSMilton Miller	$(filter-out _all sub-make,$(MAKECMDGOALS))
1781da177e4SLinus Torvalds
1791da177e4SLinus Torvalds# Leave processing to above invocation of make
1801da177e4SLinus Torvaldsskip-makefile := 1
1811da177e4SLinus Torvaldsendif # ifneq ($(KBUILD_OUTPUT),)
1821da177e4SLinus Torvaldsendif # ifeq ($(KBUILD_SRC),)
1831da177e4SLinus Torvalds
1841da177e4SLinus Torvalds# We process the rest of the Makefile if this is the final invocation of make
1851da177e4SLinus Torvaldsifeq ($(skip-makefile),)
1861da177e4SLinus Torvalds
187*7ff52571SMasahiro Yamada# Do not print "Entering directory ...",
188*7ff52571SMasahiro Yamada# but we want to display it when entering to the output directory
189*7ff52571SMasahiro Yamada# so that IDEs/editors are able to understand relative filenames.
190*7ff52571SMasahiro YamadaMAKEFLAGS += --no-print-directory
191*7ff52571SMasahiro Yamada
1921da177e4SLinus Torvalds# If building an external module we do not care about the all: rule
1931da177e4SLinus Torvalds# but instead _all depend on modules
1944f193362SPaul SmithPHONY += all
1951da177e4SLinus Torvaldsifeq ($(KBUILD_EXTMOD),)
1961da177e4SLinus Torvalds_all: all
1971da177e4SLinus Torvaldselse
1981da177e4SLinus Torvalds_all: modules
1991da177e4SLinus Torvaldsendif
2001da177e4SLinus Torvalds
2019da0763bSMichal Marekifeq ($(KBUILD_SRC),)
2029da0763bSMichal Marek        # building in the source tree
2039da0763bSMichal Marek        srctree := .
2049da0763bSMichal Marekelse
2059da0763bSMichal Marek        ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
2069da0763bSMichal Marek                # building in a subdirectory of the source tree
2079da0763bSMichal Marek                srctree := ..
2089da0763bSMichal Marek        else
2099da0763bSMichal Marek                srctree := $(KBUILD_SRC)
2109da0763bSMichal Marek        endif
2119da0763bSMichal Marekendif
2127e1c0477SMichal Marekobjtree		:= .
2131da177e4SLinus Torvaldssrc		:= $(srctree)
2141da177e4SLinus Torvaldsobj		:= $(objtree)
2151da177e4SLinus Torvalds
2160f558c33SMattia DongiliVPATH		:= $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
2171da177e4SLinus Torvalds
21811294235SAmerigo Wangexport srctree objtree VPATH
2191da177e4SLinus Torvalds
2201da177e4SLinus Torvalds
2211da177e4SLinus Torvalds# SUBARCH tells the usermode build what the underlying arch is.  That is set
2221da177e4SLinus Torvalds# first, and if a usermode build is happening, the "ARCH=um" on the command
2231da177e4SLinus Torvalds# line overrides the setting of ARCH below.  If a native build is happening,
2241da177e4SLinus Torvalds# then ARCH is assigned, getting whatever value it gets normally, and
2251da177e4SLinus Torvalds# SUBARCH is subsequently ignored.
2261da177e4SLinus Torvalds
227ffee0de4SDavid WoodhouseSUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
228ffee0de4SDavid Woodhouse				  -e s/sun4u/sparc64/ \
2291da177e4SLinus Torvalds				  -e s/arm.*/arm/ -e s/sa110/arm/ \
23039990b5eSLinus Torvalds				  -e s/s390x/s390/ -e s/parisc64/parisc/ \
231236b1957SPaul Mundt				  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
232f1b99392SWill Deacon				  -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
2331da177e4SLinus Torvalds
2341da177e4SLinus Torvalds# Cross compiling and selecting different set of gcc/bin-utils
2351da177e4SLinus Torvalds# ---------------------------------------------------------------------------
2361da177e4SLinus Torvalds#
2371da177e4SLinus Torvalds# When performing cross compilation for other architectures ARCH shall be set
2381da177e4SLinus Torvalds# to the target architecture. (See arch/* for the possibilities).
2391da177e4SLinus Torvalds# ARCH can be set during invocation of make:
2401da177e4SLinus Torvalds# make ARCH=ia64
2411da177e4SLinus Torvalds# Another way is to have ARCH set in the environment.
2421da177e4SLinus Torvalds# The default ARCH is the host where make is executed.
2431da177e4SLinus Torvalds
2441da177e4SLinus Torvalds# CROSS_COMPILE specify the prefix used for all executables used
2451da177e4SLinus Torvalds# during compilation. Only gcc and related bin-utils executables
2461da177e4SLinus Torvalds# are prefixed with $(CROSS_COMPILE).
2471da177e4SLinus Torvalds# CROSS_COMPILE can be set on the command line
2481da177e4SLinus Torvalds# make CROSS_COMPILE=ia64-linux-
2491da177e4SLinus Torvalds# Alternatively CROSS_COMPILE can be set in the environment.
25084336466SRoland McGrath# A third alternative is to store a setting in .config so that plain
25184336466SRoland McGrath# "make" in the configured kernel build directory always uses that.
2521da177e4SLinus Torvalds# Default value for CROSS_COMPILE is not to prefix executables
2531da177e4SLinus Torvalds# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
2542331d1a6SSam RavnborgARCH		?= $(SUBARCH)
25584336466SRoland McGrathCROSS_COMPILE	?= $(CONFIG_CROSS_COMPILE:"%"=%)
2561da177e4SLinus Torvalds
2571da177e4SLinus Torvalds# Architecture as present in compile.h
2581da177e4SLinus TorvaldsUTS_MACHINE 	:= $(ARCH)
2596752ed90SThomas GleixnerSRCARCH 	:= $(ARCH)
2601da177e4SLinus Torvalds
261d746d647SSam Ravnborg# Additional ARCH settings for x86
262d746d647SSam Ravnborgifeq ($(ARCH),i386)
263d746d647SSam Ravnborg        SRCARCH := x86
264d746d647SSam Ravnborgendif
265d746d647SSam Ravnborgifeq ($(ARCH),x86_64)
266d746d647SSam Ravnborg        SRCARCH := x86
267d746d647SSam Ravnborgendif
26874b469f2SSam Ravnborg
2695e538790SSam Ravnborg# Additional ARCH settings for sparc
270e69f58c0SNamhyung Kimifeq ($(ARCH),sparc32)
271e69f58c0SNamhyung Kim       SRCARCH := sparc
272e69f58c0SNamhyung Kimendif
273a439fe51SSam Ravnborgifeq ($(ARCH),sparc64)
2745e538790SSam Ravnborg       SRCARCH := sparc
275a439fe51SSam Ravnborgendif
2762fb9b1bdSSam Ravnborg
2773cc000b5SPaul Mundt# Additional ARCH settings for sh
2783cc000b5SPaul Mundtifeq ($(ARCH),sh64)
2793cc000b5SPaul Mundt       SRCARCH := sh
2803cc000b5SPaul Mundtendif
2813cc000b5SPaul Mundt
28218aecc2bSChris Metcalf# Additional ARCH settings for tile
2836738d321SChris Metcalfifeq ($(ARCH),tilepro)
2846738d321SChris Metcalf       SRCARCH := tile
2856738d321SChris Metcalfendif
28618aecc2bSChris Metcalfifeq ($(ARCH),tilegx)
28718aecc2bSChris Metcalf       SRCARCH := tile
28818aecc2bSChris Metcalfendif
28918aecc2bSChris Metcalf
2905e538790SSam Ravnborg# Where to locate arch specific headers
2915e538790SSam Ravnborghdr-arch  := $(SRCARCH)
2925e538790SSam Ravnborg
29314cdd3c4SRoman ZippelKCONFIG_CONFIG	?= .config
29441263fc6SBen Gardinerexport KCONFIG_CONFIG
29514cdd3c4SRoman Zippel
2961da177e4SLinus Torvalds# SHELL used by kbuild
2971da177e4SLinus TorvaldsCONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
2981da177e4SLinus Torvalds	  else if [ -x /bin/bash ]; then echo /bin/bash; \
2991da177e4SLinus Torvalds	  else echo sh; fi ; fi)
3001da177e4SLinus Torvalds
3011da177e4SLinus TorvaldsHOSTCC       = gcc
3021da177e4SLinus TorvaldsHOSTCXX      = g++
30325583d4bSJosh TriplettHOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
3041da177e4SLinus TorvaldsHOSTCXXFLAGS = -O2
3051da177e4SLinus Torvalds
30661163efaSBehan Websterifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
30761163efaSBehan WebsterHOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
30861163efaSBehan Webster		-Wno-missing-field-initializers -fno-delete-null-pointer-checks
30961163efaSBehan Websterendif
31061163efaSBehan Webster
3111da177e4SLinus Torvalds# Decide whether to build built-in, modular, or both.
3121da177e4SLinus Torvalds# Normally, just do built-in.
3131da177e4SLinus Torvalds
3141da177e4SLinus TorvaldsKBUILD_MODULES :=
3151da177e4SLinus TorvaldsKBUILD_BUILTIN := 1
3161da177e4SLinus Torvalds
3171da177e4SLinus Torvalds# If we have only "make modules", don't compile built-in objects.
3181da177e4SLinus Torvalds# When we're building modules with modversions, we need to consider
3191da177e4SLinus Torvalds# the built-in objects during the descend as well, in order to
3201da177e4SLinus Torvalds# make sure the checksums are up to date before we record them.
3211da177e4SLinus Torvalds
3221da177e4SLinus Torvaldsifeq ($(MAKECMDGOALS),modules)
3231da177e4SLinus Torvalds  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
3241da177e4SLinus Torvaldsendif
3251da177e4SLinus Torvalds
3261da177e4SLinus Torvalds# If we have "make <whatever> modules", compile modules
3271da177e4SLinus Torvalds# in addition to whatever we do anyway.
3281da177e4SLinus Torvalds# Just "make" or "make all" shall build modules as well
3291da177e4SLinus Torvalds
3301da177e4SLinus Torvaldsifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
3311da177e4SLinus Torvalds  KBUILD_MODULES := 1
3321da177e4SLinus Torvaldsendif
3331da177e4SLinus Torvalds
3341da177e4SLinus Torvaldsifeq ($(MAKECMDGOALS),)
3351da177e4SLinus Torvalds  KBUILD_MODULES := 1
3361da177e4SLinus Torvaldsendif
3371da177e4SLinus Torvalds
338e579d351SSam Ravnborgexport KBUILD_MODULES KBUILD_BUILTIN
3391da177e4SLinus Torvaldsexport KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
3401da177e4SLinus Torvalds
34161163efaSBehan Websterifneq ($(CC),)
34261163efaSBehan Websterifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1)
34361163efaSBehan WebsterCOMPILER := clang
34461163efaSBehan Websterelse
34561163efaSBehan WebsterCOMPILER := gcc
34661163efaSBehan Websterendif
34761163efaSBehan Websterexport COMPILER
34861163efaSBehan Websterendif
3491da177e4SLinus Torvalds
3501da177e4SLinus Torvalds# Look for make include files relative to root of kernel src
3511da177e4SLinus TorvaldsMAKEFLAGS += --include-dir=$(srctree)
3521da177e4SLinus Torvalds
3531cacc9abSSam Ravnborg# We need some generic definitions (do not try to remake the file).
3541cacc9abSSam Ravnborg$(srctree)/scripts/Kbuild.include: ;
3552a691470SSam Ravnborginclude $(srctree)/scripts/Kbuild.include
3568ec4b4ffSSam Ravnborg
3571da177e4SLinus Torvalds# Make variables (CC, etc...)
3581da177e4SLinus TorvaldsAS		= $(CROSS_COMPILE)as
3591da177e4SLinus TorvaldsLD		= $(CROSS_COMPILE)ld
3601da177e4SLinus TorvaldsCC		= $(CROSS_COMPILE)gcc
3611da177e4SLinus TorvaldsCPP		= $(CC) -E
3621da177e4SLinus TorvaldsAR		= $(CROSS_COMPILE)ar
3631da177e4SLinus TorvaldsNM		= $(CROSS_COMPILE)nm
3641da177e4SLinus TorvaldsSTRIP		= $(CROSS_COMPILE)strip
3651da177e4SLinus TorvaldsOBJCOPY		= $(CROSS_COMPILE)objcopy
3661da177e4SLinus TorvaldsOBJDUMP		= $(CROSS_COMPILE)objdump
3671da177e4SLinus TorvaldsAWK		= awk
3681da177e4SLinus TorvaldsGENKSYMS	= scripts/genksyms/genksyms
369caa27b66SSam RavnborgINSTALLKERNEL  := installkernel
3701da177e4SLinus TorvaldsDEPMOD		= /sbin/depmod
3711da177e4SLinus TorvaldsPERL		= perl
372011bf125SMasahiro YamadaPYTHON		= python
3731da177e4SLinus TorvaldsCHECK		= sparse
3741da177e4SLinus Torvalds
37580a7d1d9SHannes EderCHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
37680a7d1d9SHannes Eder		  -Wbitwise -Wno-return-void $(CF)
3776588169dSSam RavnborgCFLAGS_MODULE   =
3786588169dSSam RavnborgAFLAGS_MODULE   =
3796588169dSSam RavnborgLDFLAGS_MODULE  =
3801da177e4SLinus TorvaldsCFLAGS_KERNEL	=
3811da177e4SLinus TorvaldsAFLAGS_KERNEL	=
3822521f2c2SPeter OberparleiterCFLAGS_GCOV	= -fprofile-arcs -ftest-coverage
3831da177e4SLinus Torvalds
3841da177e4SLinus Torvalds
385abbf1590SDavid Howells# Use USERINCLUDE when you must reference the UAPI directories only.
386abbf1590SDavid HowellsUSERINCLUDE    := \
387abbf1590SDavid Howells		-I$(srctree)/arch/$(hdr-arch)/include/uapi \
388abbf1590SDavid Howells		-Iarch/$(hdr-arch)/include/generated/uapi \
389abbf1590SDavid Howells		-I$(srctree)/include/uapi \
390abbf1590SDavid Howells		-Iinclude/generated/uapi \
391abbf1590SDavid Howells                -include $(srctree)/include/linux/kconfig.h
392abbf1590SDavid Howells
3931da177e4SLinus Torvalds# Use LINUXINCLUDE when you must reference the include/ directory.
3941da177e4SLinus Torvalds# Needed to be compatible with the O= option
395abbf1590SDavid HowellsLINUXINCLUDE    := \
396abbf1590SDavid Howells		-I$(srctree)/arch/$(hdr-arch)/include \
397abbf1590SDavid Howells		-Iarch/$(hdr-arch)/include/generated \
39896f13045SSam Ravnborg		$(if $(KBUILD_SRC), -I$(srctree)/include) \
399abbf1590SDavid Howells		-Iinclude \
400abbf1590SDavid Howells		$(USERINCLUDE)
4011da177e4SLinus Torvalds
402d8672b40SSam RavnborgKBUILD_CPPFLAGS := -D__KERNEL__
4031da177e4SLinus Torvalds
404a0f97e06SSam RavnborgKBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
40594bed2a9SDave Jones		   -fno-strict-aliasing -fno-common \
406a8735821SFloris Kraak		   -Werror-implicit-function-declaration \
407a1c48bb1SGeert Uytterhoeven		   -Wno-format-security
408a1c48bb1SGeert Uytterhoeven
40980c00ba9SSam RavnborgKBUILD_AFLAGS_KERNEL :=
41080c00ba9SSam RavnborgKBUILD_CFLAGS_KERNEL :=
411222d394dSSam RavnborgKBUILD_AFLAGS   := -D__ASSEMBLY__
4126588169dSSam RavnborgKBUILD_AFLAGS_MODULE  := -DMODULE
4136588169dSSam RavnborgKBUILD_CFLAGS_MODULE  := -DMODULE
4146588169dSSam RavnborgKBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
4151da177e4SLinus Torvalds
416f1d28fb0SRoman Zippel# Read KERNELRELEASE from include/config/kernel.release (if it exists)
417f1d28fb0SRoman ZippelKERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
418cacd54efSMichal MarekKERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
419cb58455cSSam Ravnborg
420070b98bfSSam Ravnborgexport VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
42180ef88d6SSam Ravnborgexport ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
422caa27b66SSam Ravnborgexport CPP AR NM STRIP OBJCOPY OBJDUMP
423011bf125SMasahiro Yamadaexport MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
424070b98bfSSam Ravnborgexport HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
4251da177e4SLinus Torvalds
42606c5040cSSam Ravnborgexport KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
4272521f2c2SPeter Oberparleiterexport KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
428222d394dSSam Ravnborgexport KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
4296588169dSSam Ravnborgexport KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
43080c00ba9SSam Ravnborgexport KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
43140df759eSMichal Marekexport KBUILD_ARFLAGS
4321da177e4SLinus Torvalds
4331da177e4SLinus Torvalds# When compiling out-of-tree modules, put MODVERDIR in the module
4341da177e4SLinus Torvalds# tree rather than in the kernel tree. The kernel tree might
4351da177e4SLinus Torvalds# even be read-only.
4361da177e4SLinus Torvaldsexport MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
4371da177e4SLinus Torvalds
4381da177e4SLinus Torvalds# Files to ignore in find ... statements
4391da177e4SLinus Torvalds
440ae63b2d7SPrarit Bhargavaexport RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
441ae63b2d7SPrarit Bhargava			  -name CVS -o -name .pc -o -name .hg -o -name .git \) \
442ae63b2d7SPrarit Bhargava			  -prune -o
443450c6076SJesper Juhlexport RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
444450c6076SJesper Juhl			 --exclude CVS --exclude .pc --exclude .hg --exclude .git
4451da177e4SLinus Torvalds
4461da177e4SLinus Torvalds# ===========================================================================
4471da177e4SLinus Torvalds# Rules shared between *config targets and build targets
4481da177e4SLinus Torvalds
4491da177e4SLinus Torvalds# Basic helpers built in scripts/
4504f193362SPaul SmithPHONY += scripts_basic
4511da177e4SLinus Torvaldsscripts_basic:
4521da177e4SLinus Torvalds	$(Q)$(MAKE) $(build)=scripts/basic
453638adb05SSteven Rostedt	$(Q)rm -f .tmp_quiet_recordmcount
4541da177e4SLinus Torvalds
455cd05e6bdSJan Beulich# To avoid any implicit rule to kick in, define an empty command.
456cd05e6bdSJan Beulichscripts/basic/%: scripts_basic ;
457cd05e6bdSJan Beulich
4584f193362SPaul SmithPHONY += outputmakefile
459fd5f0cd6SJan Beulich# outputmakefile generates a Makefile in the output directory, if using a
460fd5f0cd6SJan Beulich# separate output directory. This allows convenient use of make in the
461fd5f0cd6SJan Beulich# output directory.
4621da177e4SLinus Torvaldsoutputmakefile:
463fd5f0cd6SJan Beulichifneq ($(KBUILD_SRC),)
46492979997SAndi Kleen	$(Q)ln -fsn $(srctree) source
465fd5f0cd6SJan Beulich	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
466fd5f0cd6SJan Beulich	    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
467fd5f0cd6SJan Beulichendif
4681da177e4SLinus Torvalds
469d8ecc5cdSSam Ravnborg# Support for using generic headers in asm-generic
470d8ecc5cdSSam RavnborgPHONY += asm-generic
471d8ecc5cdSSam Ravnborgasm-generic:
472d8ecc5cdSSam Ravnborg	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
4733c5994c8SCatalin Marinas	            src=asm obj=arch/$(SRCARCH)/include/generated/asm
4743c5994c8SCatalin Marinas	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
4753c5994c8SCatalin Marinas	            src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
476d8ecc5cdSSam Ravnborg
4771da177e4SLinus Torvalds# To make sure we do not include .config for any of the *config targets
4781da177e4SLinus Torvalds# catch them early, and hand them over to scripts/kconfig/Makefile
4791da177e4SLinus Torvalds# It is allowed to specify more targets when calling make, including
4801da177e4SLinus Torvalds# mixing *config targets and build targets.
4811da177e4SLinus Torvalds# For example 'make oldconfig all'.
4821da177e4SLinus Torvalds# Detect when mixed targets is specified, and make a second invocation
4831da177e4SLinus Torvalds# of make so .config is not included in this case either (for *config).
4841da177e4SLinus Torvalds
48510b63956SDavid Howellsversion_h := include/generated/uapi/linux/version.h
486d183e6f5SDavid Howells
4873eb3c740SRoman Zippelno-dot-config-targets := clean mrproper distclean \
488f4ed1009SJianbin Kang			 cscope gtags TAGS tags help %docs check% coccicheck \
489d183e6f5SDavid Howells			 $(version_h) headers_% archheaders archscripts \
4904aed2fd8SLinus Torvalds			 kernelversion %src-pkg
4911da177e4SLinus Torvalds
4921da177e4SLinus Torvaldsconfig-targets := 0
4931da177e4SLinus Torvaldsmixed-targets  := 0
4941da177e4SLinus Torvaldsdot-config     := 1
4951da177e4SLinus Torvalds
4961da177e4SLinus Torvaldsifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
4971da177e4SLinus Torvalds	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
4981da177e4SLinus Torvalds		dot-config := 0
4991da177e4SLinus Torvalds	endif
5001da177e4SLinus Torvaldsendif
5011da177e4SLinus Torvalds
5021da177e4SLinus Torvaldsifeq ($(KBUILD_EXTMOD),)
5031da177e4SLinus Torvalds        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
5041da177e4SLinus Torvalds                config-targets := 1
5051da177e4SLinus Torvalds                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
5061da177e4SLinus Torvalds                        mixed-targets := 1
5071da177e4SLinus Torvalds                endif
5081da177e4SLinus Torvalds        endif
5091da177e4SLinus Torvaldsendif
5101da177e4SLinus Torvalds
5111da177e4SLinus Torvaldsifeq ($(mixed-targets),1)
5121da177e4SLinus Torvalds# ===========================================================================
5131da177e4SLinus Torvalds# We're called with mixed targets (*config and build targets).
5141da177e4SLinus Torvalds# Handle them one by one.
5151da177e4SLinus Torvalds
5169319f453SMasahiro YamadaPHONY += $(MAKECMDGOALS) __build_one_by_one
5179319f453SMasahiro Yamada
5189319f453SMasahiro Yamada$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
5199319f453SMasahiro Yamada	@:
5209319f453SMasahiro Yamada
5219319f453SMasahiro Yamada__build_one_by_one:
5229319f453SMasahiro Yamada	$(Q)set -e; \
5239319f453SMasahiro Yamada	for i in $(MAKECMDGOALS); do \
5249319f453SMasahiro Yamada		$(MAKE) -f $(srctree)/Makefile $$i; \
5259319f453SMasahiro Yamada	done
5261da177e4SLinus Torvalds
5271da177e4SLinus Torvaldselse
5281da177e4SLinus Torvaldsifeq ($(config-targets),1)
5291da177e4SLinus Torvalds# ===========================================================================
5301da177e4SLinus Torvalds# *config targets only - make sure prerequisites are updated, and descend
5311da177e4SLinus Torvalds# in scripts/kconfig to make the *config target
5321da177e4SLinus Torvalds
5331da177e4SLinus Torvalds# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
5341da177e4SLinus Torvalds# KBUILD_DEFCONFIG may point out an alternative default configuration
5351da177e4SLinus Torvalds# used for 'make defconfig'
53674b469f2SSam Ravnborginclude $(srctree)/arch/$(SRCARCH)/Makefile
53761bee204SAl Viroexport KBUILD_DEFCONFIG KBUILD_KCONFIG
5381da177e4SLinus Torvalds
53931110ebbSSam Ravnborgconfig: scripts_basic outputmakefile FORCE
54031110ebbSSam Ravnborg	$(Q)$(MAKE) $(build)=scripts/kconfig $@
54131110ebbSSam Ravnborg
54231110ebbSSam Ravnborg%config: scripts_basic outputmakefile FORCE
5431da177e4SLinus Torvalds	$(Q)$(MAKE) $(build)=scripts/kconfig $@
5441da177e4SLinus Torvalds
5451da177e4SLinus Torvaldselse
5461da177e4SLinus Torvalds# ===========================================================================
5471da177e4SLinus Torvalds# Build targets only - this includes vmlinux, arch specific targets, clean
5481da177e4SLinus Torvalds# targets and others. In general all targets except *config targets.
5491da177e4SLinus Torvalds
5501da177e4SLinus Torvaldsifeq ($(KBUILD_EXTMOD),)
5511da177e4SLinus Torvalds# Additional helpers built in scripts/
5521da177e4SLinus Torvalds# Carefully list dependencies so we do not try to build scripts twice
553070b98bfSSam Ravnborg# in parallel
5544f193362SPaul SmithPHONY += scripts
555a54292f5SAndreas Schwabscripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
556a54292f5SAndreas Schwab	 asm-generic
5571da177e4SLinus Torvalds	$(Q)$(MAKE) $(build)=$(@)
5581da177e4SLinus Torvalds
5591da177e4SLinus Torvalds# Objects we will link into vmlinux / subdirs we need to visit
5601da177e4SLinus Torvaldsinit-y		:= init/
5614d2acfbfSDavid Woodhousedrivers-y	:= drivers/ sound/ firmware/
5621da177e4SLinus Torvaldsnet-y		:= net/
5631da177e4SLinus Torvaldslibs-y		:= lib/
5641da177e4SLinus Torvaldscore-y		:= usr/
5651da177e4SLinus Torvaldsendif # KBUILD_EXTMOD
5661da177e4SLinus Torvalds
5671da177e4SLinus Torvaldsifeq ($(dot-config),1)
5689ee4e336SSam Ravnborg# Read in config
5699ee4e336SSam Ravnborg-include include/config/auto.conf
5701da177e4SLinus Torvalds
5719ee4e336SSam Ravnborgifeq ($(KBUILD_EXTMOD),)
5721da177e4SLinus Torvalds# Read in dependencies to all Kconfig* files, make sure to run
5731da177e4SLinus Torvalds# oldconfig if changes are detected.
574c955ccafSRoman Zippel-include include/config/auto.conf.cmd
5751da177e4SLinus Torvalds
5761da177e4SLinus Torvalds# To avoid any implicit rule to kick in, define an empty command
57714cdd3c4SRoman Zippel$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
5781da177e4SLinus Torvalds
579c955ccafSRoman Zippel# If .config is newer than include/config/auto.conf, someone tinkered
580752625cfSSam Ravnborg# with it and forgot to run make oldconfig.
581070b98bfSSam Ravnborg# if auto.conf.cmd is missing then we are probably in a cleaned tree so
582752625cfSSam Ravnborg# we execute the config step to be sure to catch updated Kconfig files
583bc081dd6SMichal Marekinclude/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
5841da177e4SLinus Torvalds	$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
5851da177e4SLinus Torvaldselse
586264a2683SSam Ravnborg# external modules needs include/generated/autoconf.h and include/config/auto.conf
5879ee4e336SSam Ravnborg# but do not care if they are up-to-date. Use auto.conf to trigger the test
5889ee4e336SSam RavnborgPHONY += include/config/auto.conf
5899ee4e336SSam Ravnborg
5909ee4e336SSam Ravnborginclude/config/auto.conf:
591264a2683SSam Ravnborg	$(Q)test -e include/generated/autoconf.h -a -e $@ || (		\
5925369f550SMichal Marek	echo >&2;							\
5935369f550SMichal Marek	echo >&2 "  ERROR: Kernel configuration is invalid.";		\
5945369f550SMichal Marek	echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
5955369f550SMichal Marek	echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";	\
5965369f550SMichal Marek	echo >&2 ;							\
5979ee4e336SSam Ravnborg	/bin/false)
5989ee4e336SSam Ravnborg
5999ee4e336SSam Ravnborgendif # KBUILD_EXTMOD
600c955ccafSRoman Zippel
6011da177e4SLinus Torvaldselse
6021da177e4SLinus Torvalds# Dummy target needed, because used as prerequisite
603c955ccafSRoman Zippelinclude/config/auto.conf: ;
6049ee4e336SSam Ravnborgendif # $(dot-config)
6051da177e4SLinus Torvalds
6061da177e4SLinus Torvalds# The all: target is the default when no target is given on the
6071da177e4SLinus Torvalds# command line.
6081da177e4SLinus Torvalds# This allow a user to issue only 'make' to build a kernel including modules
609c8447161SMichal Marek# Defaults to vmlinux, but the arch makefile usually adds further targets
6101da177e4SLinus Torvaldsall: vmlinux
6111da177e4SLinus Torvalds
612a1c48bb1SGeert Uytterhoeveninclude $(srctree)/arch/$(SRCARCH)/Makefile
613a1c48bb1SGeert Uytterhoeven
614a1c48bb1SGeert UytterhoevenKBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
615a1c48bb1SGeert Uytterhoeven
6161da177e4SLinus Torvaldsifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
617e74fc973SArnd BergmannKBUILD_CFLAGS	+= -Os $(call cc-disable-warning,maybe-uninitialized,)
6181da177e4SLinus Torvaldselse
619a0f97e06SSam RavnborgKBUILD_CFLAGS	+= -O2
6201da177e4SLinus Torvaldsendif
6211da177e4SLinus Torvalds
62269102311SJiri Kosina# Tell gcc to never replace conditional load with a non-conditional one
62369102311SJiri KosinaKBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)
62469102311SJiri Kosina
6251873e870SAndi Kleenifdef CONFIG_READABLE_ASM
6261873e870SAndi Kleen# Disable optimizations that make assembler listings hard to read.
6271873e870SAndi Kleen# reorder blocks reorders the control in the function
6281873e870SAndi Kleen# ipa clone creates specialized cloned functions
6291873e870SAndi Kleen# partial inlining inlines only parts of functions
6301873e870SAndi KleenKBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
6311873e870SAndi Kleen                 $(call cc-option,-fno-ipa-cp-clone,) \
6321873e870SAndi Kleen                 $(call cc-option,-fno-partial-inlining)
6331873e870SAndi Kleenendif
6341873e870SAndi Kleen
63508f67461SMike Frysingerifneq ($(CONFIG_FRAME_WARN),0)
63635bb5b1eSAndi KleenKBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
63735bb5b1eSAndi Kleenendif
63835bb5b1eSAndi Kleen
63919952a92SKees Cook# Handle stack protector mode.
6401332429bSKees Cook#
6411332429bSKees Cook# Since kbuild can potentially perform two passes (first with the old
6421332429bSKees Cook# .config values and then with updated .config values), we cannot error out
6431332429bSKees Cook# if a desired compiler option is unsupported. If we were to error, kbuild
6441332429bSKees Cook# could never get to the second pass and actually notice that we changed
6451332429bSKees Cook# the option to something that was supported.
6461332429bSKees Cook#
6471332429bSKees Cook# Additionally, we don't want to fallback and/or silently change which compiler
6481332429bSKees Cook# flags will be used, since that leads to producing kernels with different
6491332429bSKees Cook# security feature characteristics depending on the compiler used. ("But I
6501332429bSKees Cook# selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
6511332429bSKees Cook#
6521332429bSKees Cook# The middle ground is to warn here so that the failed option is obvious, but
6531332429bSKees Cook# to let the build fail with bad compiler flags so that we can't produce a
6541332429bSKees Cook# kernel when there is a CONFIG and compiler mismatch.
6551332429bSKees Cook#
6568779657dSKees Cookifdef CONFIG_CC_STACKPROTECTOR_REGULAR
65719952a92SKees Cook  stackp-flag := -fstack-protector
65819952a92SKees Cook  ifeq ($(call cc-option, $(stackp-flag)),)
6596c15b327SJan Beulich    $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
66027b2a49aSFathi Boudra             -fstack-protector not supported by compiler)
6615d707e9cSTejun Heo  endif
6626c15b327SJan Beulichelse
6636c15b327SJan Beulichifdef CONFIG_CC_STACKPROTECTOR_STRONG
6648779657dSKees Cook  stackp-flag := -fstack-protector-strong
6658779657dSKees Cook  ifeq ($(call cc-option, $(stackp-flag)),)
6668779657dSKees Cook    $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
6678779657dSKees Cook	      -fstack-protector-strong not supported by compiler)
6688779657dSKees Cook  endif
66919952a92SKees Cookelse
67019952a92SKees Cook  # Force off for distro compilers that enable stack protector by default.
67119952a92SKees Cook  stackp-flag := $(call cc-option, -fno-stack-protector)
67219952a92SKees Cookendif
6736c15b327SJan Beulichendif
67419952a92SKees CookKBUILD_CFLAGS += $(stackp-flag)
675e06b8b98SSam Ravnborg
67661163efaSBehan Websterifeq ($(COMPILER),clang)
67761163efaSBehan WebsterKBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
67861163efaSBehan WebsterKBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
67961163efaSBehan WebsterKBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
68061163efaSBehan WebsterKBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
68161163efaSBehan WebsterKBUILD_CFLAGS += $(call cc-disable-warning, gnu)
68261163efaSBehan Webster# Quiet clang warning: comparison of unsigned expression < 0 is always false
68361163efaSBehan WebsterKBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
68461163efaSBehan Webster# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
68561163efaSBehan Webster# source of a reference will be _MergedGlobals and not on of the whitelisted names.
68661163efaSBehan Webster# See modpost pattern 2
68761163efaSBehan WebsterKBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
68826ea6bb1SBehan WebsterKBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
68961163efaSBehan Websterelse
69061163efaSBehan Webster
691af0e5d56SDave Jones# This warning generated too much noise in a regular build.
692af0e5d56SDave Jones# Use make W=1 to enable this warning (see scripts/Makefile.build)
6938417da6fSMichal MarekKBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
69461163efaSBehan Websterendif
695af0e5d56SDave Jones
6961da177e4SLinus Torvaldsifdef CONFIG_FRAME_POINTER
697a0f97e06SSam RavnborgKBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
6981da177e4SLinus Torvaldselse
6997e9501fdSRabin Vincent# Some targets (ARM with Thumb2, for example), can't be built with frame
7007e9501fdSRabin Vincent# pointers.  For those, we don't have FUNCTION_TRACER automatically
7017e9501fdSRabin Vincent# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
7027e9501fdSRabin Vincent# incompatible with -fomit-frame-pointer with current GCC, so we don't use
7037e9501fdSRabin Vincent# -fomit-frame-pointer with FUNCTION_TRACER.
7047e9501fdSRabin Vincentifndef CONFIG_FUNCTION_TRACER
705a0f97e06SSam RavnborgKBUILD_CFLAGS	+= -fomit-frame-pointer
7061da177e4SLinus Torvaldsendif
7077e9501fdSRabin Vincentendif
7081da177e4SLinus Torvalds
7092062afb4SLinus TorvaldsKBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
7102062afb4SLinus Torvalds
7111da177e4SLinus Torvaldsifdef CONFIG_DEBUG_INFO
712866ced95SAndi Kleenifdef CONFIG_DEBUG_INFO_SPLIT
713866ced95SAndi KleenKBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
714866ced95SAndi Kleenelse
715a0f97e06SSam RavnborgKBUILD_CFLAGS	+= -g
716866ced95SAndi Kleenendif
7172288328cSBehan WebsterKBUILD_AFLAGS	+= -Wa,-gdwarf-2
7181da177e4SLinus Torvaldsendif
719bfaf2dd3SAndi Kleenifdef CONFIG_DEBUG_INFO_DWARF4
720bfaf2dd3SAndi KleenKBUILD_CFLAGS	+= $(call cc-option, -gdwarf-4,)
721bfaf2dd3SAndi Kleenendif
7221da177e4SLinus Torvalds
723d6f4ceb7SAndi Kleenifdef CONFIG_DEBUG_INFO_REDUCED
724e82c4bb8SAndi KleenKBUILD_CFLAGS 	+= $(call cc-option, -femit-struct-debug-baseonly) \
725e82c4bb8SAndi Kleen		   $(call cc-option,-fno-var-tracking)
726d6f4ceb7SAndi Kleenendif
727d6f4ceb7SAndi Kleen
728606576ceSSteven Rostedtifdef CONFIG_FUNCTION_TRACER
729a2546faeSSteven Rostedtifdef CONFIG_HAVE_FENTRY
730a2546faeSSteven RostedtCC_USING_FENTRY	:= $(call cc-option, -mfentry -DCC_USING_FENTRY)
731a2546faeSSteven Rostedtendif
732a2546faeSSteven RostedtKBUILD_CFLAGS	+= -pg $(CC_USING_FENTRY)
733a2546faeSSteven RostedtKBUILD_AFLAGS	+= $(CC_USING_FENTRY)
73472441cb1SSteven Rostedtifdef CONFIG_DYNAMIC_FTRACE
735cf4db259SSteven Rostedt	ifdef CONFIG_HAVE_C_RECORDMCOUNT
73672441cb1SSteven Rostedt		BUILD_C_RECORDMCOUNT := y
73772441cb1SSteven Rostedt		export BUILD_C_RECORDMCOUNT
73872441cb1SSteven Rostedt	endif
73972441cb1SSteven Rostedtendif
74016444a8aSArnaldo Carvalho de Meloendif
74116444a8aSArnaldo Carvalho de Melo
74291341d4bSSam Ravnborg# We trigger additional mismatches with less inlining
74391341d4bSSam Ravnborgifdef CONFIG_DEBUG_SECTION_MISMATCH
74491341d4bSSam RavnborgKBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
74591341d4bSSam Ravnborgendif
74691341d4bSSam Ravnborg
747e8e69931SSam Ravnborg# arch Makefile may override CC so keep this after arch Makefile is included
748e8f5bdb0SRik van RielNOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
749e8e69931SSam RavnborgCHECKFLAGS     += $(NOSTDINC_FLAGS)
750e8e69931SSam Ravnborg
7511da177e4SLinus Torvalds# warn about C99 declaration after statement
752a0f97e06SSam RavnborgKBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
7531da177e4SLinus Torvalds
754070b98bfSSam Ravnborg# disable pointer signed / unsigned warnings in gcc 4.0
7558417da6fSMichal MarekKBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
7561da177e4SLinus Torvalds
757fe8d0a41SKirill Smelkov# disable invalid "can't wrap" optimizations for signed / pointers
758a137802eSLinus TorvaldsKBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
759d0115552SLinus Torvalds
7608f7f5c9fSAndi Kleen# conserve stack if available
7618f7f5c9fSAndi KleenKBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
7628f7f5c9fSAndi Kleen
76380970472SSergei Trofimovich# disallow errors like 'EXPORT_GPL(foo);' with missing header
76480970472SSergei TrofimovichKBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
76580970472SSergei Trofimovich
76680970472SSergei Trofimovich# require functions to have arguments in prototypes, not empty 'int foo()'
76780970472SSergei TrofimovichKBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
76880970472SSergei Trofimovich
769fe7c36c7SJosh Triplett# Prohibit date/time macros, which would make the build non-deterministic
770fe7c36c7SJosh TriplettKBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
771fe7c36c7SJosh Triplett
77240df759eSMichal Marek# use the deterministic mode of AR if available
77340df759eSMichal MarekKBUILD_ARFLAGS := $(call ar-option,D)
77440df759eSMichal Marek
775bf5438fcSJason Baron# check for 'asm goto'
776bf5438fcSJason Baronifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
777bf5438fcSJason Baron	KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
778bf5438fcSJason Baronendif
779bf5438fcSJason Baron
780a86fe353SMasahiro Yamadainclude $(srctree)/scripts/Makefile.extrawarn
781a86fe353SMasahiro Yamada
78206c5040cSSam Ravnborg# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
78369ee0b35SSam RavnborgKBUILD_CPPFLAGS += $(KCPPFLAGS)
78469ee0b35SSam RavnborgKBUILD_AFLAGS += $(KAFLAGS)
78569ee0b35SSam RavnborgKBUILD_CFLAGS += $(KCFLAGS)
78652bcc330SSam Ravnborg
78718991197SRoland McGrath# Use --build-id when available.
78818991197SRoland McGrathLDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
789f86fd306SSam Ravnborg			      $(call cc-ldoption, -Wl$(comma)--build-id,))
7906588169dSSam RavnborgKBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
79118991197SRoland McGrathLDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
79218991197SRoland McGrath
7935d7d18f5SDavid Howellsifeq ($(CONFIG_STRIP_ASM_SYMS),y)
794d79a2719SAndi KleenLDFLAGS_vmlinux	+= $(call ld-option, -X,)
7955d7d18f5SDavid Howellsendif
7965d7d18f5SDavid Howells
7971da177e4SLinus Torvalds# Default kernel image to build when no specific target is given.
7981da177e4SLinus Torvalds# KBUILD_IMAGE may be overruled on the command line or
7991da177e4SLinus Torvalds# set in the environment
8001da177e4SLinus Torvalds# Also any assignments in arch/$(ARCH)/Makefile take precedence over
8011da177e4SLinus Torvalds# this default value
8021da177e4SLinus Torvaldsexport KBUILD_IMAGE ?= vmlinux
8031da177e4SLinus Torvalds
8041da177e4SLinus Torvalds#
8051da177e4SLinus Torvalds# INSTALL_PATH specifies where to place the updated kernel and system map
8061da177e4SLinus Torvalds# images. Default is /boot, but you can set it to other values
8071da177e4SLinus Torvaldsexport	INSTALL_PATH ?= /boot
8081da177e4SLinus Torvalds
8091da177e4SLinus Torvalds#
810f4d4ffc0SJason Cooper# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
811f4d4ffc0SJason Cooper# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
812f4d4ffc0SJason Cooper# an argument if needed. Otherwise it defaults to the kernel install path
813f4d4ffc0SJason Cooper#
814f4d4ffc0SJason Cooperexport INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
815f4d4ffc0SJason Cooper
816f4d4ffc0SJason Cooper#
8171da177e4SLinus Torvalds# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
8181da177e4SLinus Torvalds# relocations required by build roots.  This is not defined in the
819070b98bfSSam Ravnborg# makefile but the argument can be passed to make if needed.
8201da177e4SLinus Torvalds#
8211da177e4SLinus Torvalds
822df9df036SSam RavnborgMODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
8231da177e4SLinus Torvaldsexport MODLIB
8241da177e4SLinus Torvalds
825ac031f26STheodore Ts'o#
8262ea03891SSam Ravnborg# INSTALL_MOD_STRIP, if defined, will cause modules to be
8272ea03891SSam Ravnborg# stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
8282ea03891SSam Ravnborg# the default option --strip-debug will be used.  Otherwise,
829177b241dSGilles Espinasse# INSTALL_MOD_STRIP value will be used as the options to the strip command.
8302ea03891SSam Ravnborg
831ac031f26STheodore Ts'oifdef INSTALL_MOD_STRIP
832ac031f26STheodore Ts'oifeq ($(INSTALL_MOD_STRIP),1)
8332ea03891SSam Ravnborgmod_strip_cmd = $(STRIP) --strip-debug
834ac031f26STheodore Ts'oelse
8352ea03891SSam Ravnborgmod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
836ac031f26STheodore Ts'oendif # INSTALL_MOD_STRIP=1
837ac031f26STheodore Ts'oelse
8382ea03891SSam Ravnborgmod_strip_cmd = true
839ac031f26STheodore Ts'oendif # INSTALL_MOD_STRIP
840ac031f26STheodore Ts'oexport mod_strip_cmd
841ac031f26STheodore Ts'o
8421bf49dd4SP J P# Select initial ramdisk compression format, default is gzip(1).
8431bf49dd4SP J P# This shall be used by the dracut(8) tool while creating an initramfs image.
8441bf49dd4SP J P#
8457ac18156SJan BeulichINITRD_COMPRESS-y                  := gzip
8467ac18156SJan BeulichINITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
8477ac18156SJan BeulichINITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
8487ac18156SJan BeulichINITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
8497ac18156SJan BeulichINITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
8507ac18156SJan BeulichINITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
851b7000adeSLinus Torvalds# do not export INITRD_COMPRESS, since we didn't actually
852b7000adeSLinus Torvalds# choose a sane default compression above.
853b7000adeSLinus Torvalds# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
8541da177e4SLinus Torvalds
855d9d8d7edSMichal Marekifdef CONFIG_MODULE_SIG_ALL
856e2a666d5SRusty RussellMODSECKEY = ./signing_key.priv
857e2a666d5SRusty RussellMODPUBKEY = ./signing_key.x509
858e2a666d5SRusty Russellexport MODPUBKEY
8594bc9410cSMichal Marekmod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
860e2a666d5SRusty Russellelse
861e2a666d5SRusty Russellmod_sign_cmd = true
862e2a666d5SRusty Russellendif
863e2a666d5SRusty Russellexport mod_sign_cmd
864e2a666d5SRusty Russell
865e2a666d5SRusty Russell
8661da177e4SLinus Torvaldsifeq ($(KBUILD_EXTMOD),)
8673a65dfe8SJens Axboecore-y		+= kernel/ mm/ fs/ ipc/ security/ crypto/ block/
8681da177e4SLinus Torvalds
8691da177e4SLinus Torvaldsvmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
8701da177e4SLinus Torvalds		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
8711da177e4SLinus Torvalds		     $(net-y) $(net-m) $(libs-y) $(libs-m)))
8721da177e4SLinus Torvalds
8731da177e4SLinus Torvaldsvmlinux-alldirs	:= $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
8741da177e4SLinus Torvalds		     $(init-n) $(init-) \
8751da177e4SLinus Torvalds		     $(core-n) $(core-) $(drivers-n) $(drivers-) \
8761da177e4SLinus Torvalds		     $(net-n)  $(net-)  $(libs-n)    $(libs-))))
8771da177e4SLinus Torvalds
8781da177e4SLinus Torvaldsinit-y		:= $(patsubst %/, %/built-in.o, $(init-y))
8791da177e4SLinus Torvaldscore-y		:= $(patsubst %/, %/built-in.o, $(core-y))
8801da177e4SLinus Torvaldsdrivers-y	:= $(patsubst %/, %/built-in.o, $(drivers-y))
8811da177e4SLinus Torvaldsnet-y		:= $(patsubst %/, %/built-in.o, $(net-y))
8821da177e4SLinus Torvaldslibs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
8831da177e4SLinus Torvaldslibs-y2		:= $(patsubst %/, %/built-in.o, $(libs-y))
8841da177e4SLinus Torvaldslibs-y		:= $(libs-y1) $(libs-y2)
8851da177e4SLinus Torvalds
8861f2bfbd0SSam Ravnborg# Externally visible symbols (used by link-vmlinux.sh)
88795698570SSam Ravnborgexport KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
88895698570SSam Ravnborgexport KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
88995698570SSam Ravnborgexport KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
8901f2bfbd0SSam Ravnborgexport LDFLAGS_vmlinux
8916615d6c3SMichal Marek# used by scripts/pacmage/Makefile
8926615d6c3SMichal Marekexport KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
8931da177e4SLinus Torvalds
8941f2bfbd0SSam Ravnborgvmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
8951da177e4SLinus Torvalds
8961f2bfbd0SSam Ravnborg# Final link of vmlinux
8971f2bfbd0SSam Ravnborg      cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
8981f2bfbd0SSam Ravnborgquiet_cmd_link-vmlinux = LINK    $@
8991da177e4SLinus Torvalds
9001f2bfbd0SSam Ravnborg# Include targets which we want to
9011f2bfbd0SSam Ravnborg# execute if the rest of the kernel build went well.
9021f2bfbd0SSam Ravnborgvmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
9030f836e5fSDavid Woodhouseifdef CONFIG_HEADERS_CHECK
9040e7af8d0SDavid Woodhouse	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
9050f836e5fSDavid Woodhouseendif
906267c4025SMathieu Desnoyersifdef CONFIG_SAMPLES
907267c4025SMathieu Desnoyers	$(Q)$(MAKE) $(build)=samples
908267c4025SMathieu Desnoyersendif
9093794f3e8SRandy Dunlapifdef CONFIG_BUILD_DOCSRC
9103794f3e8SRandy Dunlap	$(Q)$(MAKE) $(build)=Documentation
9113794f3e8SRandy Dunlapendif
9121f2bfbd0SSam Ravnborg	+$(call if_changed,link-vmlinux)
913741f98feSSam Ravnborg
9141da177e4SLinus Torvalds# The actual objects are generated when descending,
9151da177e4SLinus Torvalds# make sure no implicit rule kicks in
9161f2bfbd0SSam Ravnborg$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
9171da177e4SLinus Torvalds
9181da177e4SLinus Torvalds# Handle descending into subdirectories listed in $(vmlinux-dirs)
9191da177e4SLinus Torvalds# Preset locale variables to speed up the build process. Limit locale
9201da177e4SLinus Torvalds# tweaks to this spot to avoid wrong language settings when running
9211da177e4SLinus Torvalds# make menuconfig etc.
9221da177e4SLinus Torvalds# Error messages still appears in the original language
9231da177e4SLinus Torvalds
9244f193362SPaul SmithPHONY += $(vmlinux-dirs)
9255bb78269SSam Ravnborg$(vmlinux-dirs): prepare scripts
9261da177e4SLinus Torvalds	$(Q)$(MAKE) $(build)=$@
9271da177e4SLinus Torvalds
9280d0e7718SMichal Marekdefine filechk_kernel.release
9290d0e7718SMichal Marek	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
9300d0e7718SMichal Marekendef
9310d0e7718SMichal Marek
93283a35e36SGeert Uytterhoeven# Store (new) KERNELRELEASE string in include/config/kernel.release
933f1d28fb0SRoman Zippelinclude/config/kernel.release: include/config/auto.conf FORCE
9340d0e7718SMichal Marek	$(call filechk,kernel.release)
935cb58455cSSam Ravnborg
936cb58455cSSam Ravnborg
9371da177e4SLinus Torvalds# Things we need to do before we recursively start building the kernel
9385bb78269SSam Ravnborg# or the modules are listed in "prepare".
9395bb78269SSam Ravnborg# A multi level approach is used. prepareN is processed before prepareN-1.
9405bb78269SSam Ravnborg# archprepare is used in arch Makefiles and when processed asm symlink,
9415bb78269SSam Ravnborg# version.h and scripts_basic is processed / created.
9421da177e4SLinus Torvalds
9435bb78269SSam Ravnborg# Listed in dependency order
9444f193362SPaul SmithPHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
9455bb78269SSam Ravnborg
94686feeaa8SSam Ravnborg# prepare3 is used to check if we are building in a separate output directory,
9471da177e4SLinus Torvalds# and if so do:
9481da177e4SLinus Torvalds# 1) Check that make has not been executed in the kernel src $(srctree)
949f1d28fb0SRoman Zippelprepare3: include/config/kernel.release
9501da177e4SLinus Torvaldsifneq ($(KBUILD_SRC),)
951fd54f502SMike Frysinger	@$(kecho) '  Using $(srctree) as source for kernel'
952c955ccafSRoman Zippel	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
9535369f550SMichal Marek		echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
9545369f550SMichal Marek		echo >&2 "  in the '$(srctree)' directory.";\
9551da177e4SLinus Torvalds		/bin/false; \
9561da177e4SLinus Torvalds	fi;
9571da177e4SLinus Torvaldsendif
9581da177e4SLinus Torvalds
95986feeaa8SSam Ravnborg# prepare2 creates a makefile if using a separate output directory
960d8ecc5cdSSam Ravnborgprepare2: prepare3 outputmakefile asm-generic
9611da177e4SLinus Torvalds
962d183e6f5SDavid Howellsprepare1: prepare2 $(version_h) include/generated/utsrelease.h \
963f7f16b77SSam Ravnborg                   include/config/auto.conf
9647bb9d092SSam Ravnborg	$(cmd_crmodverdir)
9651da177e4SLinus Torvalds
9666520fe55SH. Peter Anvinarchprepare: archheaders archscripts prepare1 scripts_basic
9675bb78269SSam Ravnborg
9685bb78269SSam Ravnborgprepare0: archprepare FORCE
9698d36a623SSam Ravnborg	$(Q)$(MAKE) $(build)=.
97086feeaa8SSam Ravnborg
9711da177e4SLinus Torvalds# All the preparing..
972d395efb5SRobert P. J. Dayprepare: prepare0
9731da177e4SLinus Torvalds
9741da177e4SLinus Torvalds# Generate some files
9751da177e4SLinus Torvalds# ---------------------------------------------------------------------------
9761da177e4SLinus Torvalds
9771da177e4SLinus Torvalds# KERNELRELEASE can change from a few different places, meaning version.h
9781da177e4SLinus Torvalds# needs to be updated, so this check is forced on all builds
9791da177e4SLinus Torvalds
9801da177e4SLinus Torvaldsuts_len := 64
98163104eecSSam Ravnborgdefine filechk_utsrelease.h
9821da177e4SLinus Torvalds	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
9831da177e4SLinus Torvalds	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
9841da177e4SLinus Torvalds	  exit 1;                                                         \
9851da177e4SLinus Torvalds	fi;                                                               \
98663104eecSSam Ravnborg	(echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
9871da177e4SLinus Torvaldsendef
9881da177e4SLinus Torvalds
98963104eecSSam Ravnborgdefine filechk_version.h
99063104eecSSam Ravnborg	(echo \#define LINUX_VERSION_CODE $(shell                         \
99178d3bb44SMichal Marek	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
99263104eecSSam Ravnborg	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
99363104eecSSam Ravnborgendef
99463104eecSSam Ravnborg
995d183e6f5SDavid Howells$(version_h): $(srctree)/Makefile FORCE
9961da177e4SLinus Torvalds	$(call filechk,version.h)
9971da177e4SLinus Torvalds
998273b281fSSam Ravnborginclude/generated/utsrelease.h: include/config/kernel.release FORCE
99963104eecSSam Ravnborg	$(call filechk,utsrelease.h)
100063104eecSSam Ravnborg
1001179efcb4SVegard NossumPHONY += headerdep
1002179efcb4SVegard Nossumheaderdep:
10039663d989SPeter Foley	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
10049663d989SPeter Foley	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1005179efcb4SVegard Nossum
10061da177e4SLinus Torvalds# ---------------------------------------------------------------------------
10071da177e4SLinus Torvalds
10084f193362SPaul SmithPHONY += depend dep
10091da177e4SLinus Torvaldsdepend dep:
10101da177e4SLinus Torvalds	@echo '*** Warning: make $@ is unnecessary now.'
10111da177e4SLinus Torvalds
10121da177e4SLinus Torvalds# ---------------------------------------------------------------------------
101388ecf814SDavid Woodhouse# Firmware install
101488ecf814SDavid WoodhouseINSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
101588ecf814SDavid Woodhouseexport INSTALL_FW_PATH
101688ecf814SDavid Woodhouse
101788ecf814SDavid WoodhousePHONY += firmware_install
101888ecf814SDavid Woodhousefirmware_install: FORCE
101988ecf814SDavid Woodhouse	@mkdir -p $(objtree)/firmware
102088ecf814SDavid Woodhouse	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
102188ecf814SDavid Woodhouse
102288ecf814SDavid Woodhouse# ---------------------------------------------------------------------------
10238d730cfbSDavid Woodhouse# Kernel headers
10248d730cfbSDavid Woodhouse
1025e6883b18SSam Ravnborg#Default location for installed headers
1026e6883b18SSam Ravnborgexport INSTALL_HDR_PATH = $(objtree)/usr
1027e6883b18SSam Ravnborg
1028e6883b18SSam Ravnborghdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
10292fb9b1bdSSam Ravnborg
10302fb9b1bdSSam Ravnborg# If we do an all arch process set dst to asm-$(hdr-arch)
10312fb9b1bdSSam Ravnborghdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1032e6883b18SSam Ravnborg
1033052ad274SH. Peter AnvinPHONY += archheaders
1034052ad274SH. Peter Anvinarchheaders:
1035052ad274SH. Peter Anvin
10366520fe55SH. Peter AnvinPHONY += archscripts
10376520fe55SH. Peter Anvinarchscripts:
10386520fe55SH. Peter Anvin
1039e6883b18SSam RavnborgPHONY += __headers
1040d183e6f5SDavid Howells__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1041e1b702cfSMike Waychison	$(Q)$(MAKE) $(build)=scripts build_unifdef
10426d716275SDavid Woodhouse
10436d716275SDavid WoodhousePHONY += headers_install_all
10442fb9b1bdSSam Ravnborgheaders_install_all:
10452fb9b1bdSSam Ravnborg	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
10466d716275SDavid Woodhouse
10478d730cfbSDavid WoodhousePHONY += headers_install
1048e6883b18SSam Ravnborgheaders_install: __headers
104910b63956SDavid Howells	$(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
10502fb9b1bdSSam Ravnborg	  $(error Headers not exportable for the $(SRCARCH) architecture))
105110b63956SDavid Howells	$(Q)$(MAKE) $(hdr-inst)=include/uapi
105210b63956SDavid Howells	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
10538d730cfbSDavid Woodhouse
10541f85712eSMike FrysingerPHONY += headers_check_all
10551f85712eSMike Frysingerheaders_check_all: headers_install_all
10562fb9b1bdSSam Ravnborg	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
10571f85712eSMike Frysinger
105868475359SDavid WoodhousePHONY += headers_check
105968475359SDavid Woodhouseheaders_check: headers_install
106010b63956SDavid Howells	$(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
106110b63956SDavid Howells	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
106268475359SDavid Woodhouse
10638d730cfbSDavid Woodhouse# ---------------------------------------------------------------------------
10645a5da78bSShuah Khan# Kernel selftest
10655a5da78bSShuah Khan
10665a5da78bSShuah KhanPHONY += kselftest
10675a5da78bSShuah Khankselftest:
10685a5da78bSShuah Khan	$(Q)$(MAKE) -C tools/testing/selftests run_tests
10695a5da78bSShuah Khan
10705a5da78bSShuah Khan# ---------------------------------------------------------------------------
10711da177e4SLinus Torvalds# Modules
10721da177e4SLinus Torvalds
10731da177e4SLinus Torvaldsifdef CONFIG_MODULES
10741da177e4SLinus Torvalds
10751da177e4SLinus Torvalds# By default, build modules as well
10761da177e4SLinus Torvalds
107773d1393eSMichal Marekall: modules
10781da177e4SLinus Torvalds
10791da177e4SLinus Torvalds# Build modules
1080551559e1STejun Heo#
1081551559e1STejun Heo# A module can be listed more than once in obj-m resulting in
1082551559e1STejun Heo# duplicate lines in modules.order files.  Those are removed
1083551559e1STejun Heo# using awk while concatenating to the final file.
10841da177e4SLinus Torvalds
10854f193362SPaul SmithPHONY += modules
10862da30e70SMichal Marekmodules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1087551559e1STejun Heo	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1088fd54f502SMike Frysinger	@$(kecho) '  Building modules, stage 2.';
1089b805aa0eSSam Ravnborg	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
109044463f7dSDavid Woodhouse	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
10911da177e4SLinus Torvalds
1092a6c36632SMichal Marekmodules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1093a6c36632SMichal Marek	$(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1094a6c36632SMichal Marek
109573d1393eSMichal Marek%/modules.builtin: include/config/auto.conf
1096a6c36632SMichal Marek	$(Q)$(MAKE) $(modbuiltin)=$*
1097a6c36632SMichal Marek
10981da177e4SLinus Torvalds
10991da177e4SLinus Torvalds# Target to prepare building external modules
11004f193362SPaul SmithPHONY += modules_prepare
11015bb78269SSam Ravnborgmodules_prepare: prepare scripts
11021da177e4SLinus Torvalds
11031da177e4SLinus Torvalds# Target to install modules
11044f193362SPaul SmithPHONY += modules_install
11051da177e4SLinus Torvaldsmodules_install: _modinst_ _modinst_post
11061da177e4SLinus Torvalds
11074f193362SPaul SmithPHONY += _modinst_
11082da30e70SMichal Marek_modinst_:
11091da177e4SLinus Torvalds	@rm -rf $(MODLIB)/kernel
11101da177e4SLinus Torvalds	@rm -f $(MODLIB)/source
11111da177e4SLinus Torvalds	@mkdir -p $(MODLIB)/kernel
1112890676c6SMichal Marek	@ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
11131da177e4SLinus Torvalds	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
11141da177e4SLinus Torvalds		rm -f $(MODLIB)/build ; \
11157e1c0477SMichal Marek		ln -s $(CURDIR) $(MODLIB)/build ; \
11161da177e4SLinus Torvalds	fi
1117551559e1STejun Heo	@cp -f $(objtree)/modules.order $(MODLIB)/
1118bc081dd6SMichal Marek	@cp -f $(objtree)/modules.builtin $(MODLIB)/
1119b805aa0eSSam Ravnborg	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
11201da177e4SLinus Torvalds
112150a8ec31SSam Ravnborg# This depmod is only for convenience to give the initial
11221da177e4SLinus Torvalds# boot a modules.dep even before / is mounted read-write.  However the
11231da177e4SLinus Torvalds# boot script depmod is the master version.
11244f193362SPaul SmithPHONY += _modinst_post
11256d128e1eSLinus Torvalds_modinst_post: _modinst_
112688ecf814SDavid Woodhouse	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
112750a8ec31SSam Ravnborg	$(call cmd,depmod)
11281da177e4SLinus Torvalds
1129d890f510SJosh Boyerifeq ($(CONFIG_MODULE_SIG), y)
1130d890f510SJosh BoyerPHONY += modules_sign
1131d890f510SJosh Boyermodules_sign:
1132d890f510SJosh Boyer	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1133d890f510SJosh Boyerendif
1134d890f510SJosh Boyer
11351da177e4SLinus Torvaldselse # CONFIG_MODULES
11361da177e4SLinus Torvalds
11371da177e4SLinus Torvalds# Modules not configured
11381da177e4SLinus Torvalds# ---------------------------------------------------------------------------
11391da177e4SLinus Torvalds
11401da177e4SLinus Torvaldsmodules modules_install: FORCE
11415369f550SMichal Marek	@echo >&2
11425369f550SMichal Marek	@echo >&2 "The present kernel configuration has modules disabled."
11435369f550SMichal Marek	@echo >&2 "Type 'make config' and enable loadable module support."
11445369f550SMichal Marek	@echo >&2 "Then build a kernel with module support enabled."
11455369f550SMichal Marek	@echo >&2
11461da177e4SLinus Torvalds	@exit 1
11471da177e4SLinus Torvalds
11481da177e4SLinus Torvaldsendif # CONFIG_MODULES
11491da177e4SLinus Torvalds
11501da177e4SLinus Torvalds###
11511da177e4SLinus Torvalds# Cleaning is done on three levels.
11521da177e4SLinus Torvalds# make clean     Delete most generated files
11531da177e4SLinus Torvalds#                Leave enough to build external modules
11541da177e4SLinus Torvalds# make mrproper  Delete the current configuration, and all generated files
11551da177e4SLinus Torvalds# make distclean Remove editor backup files, patch leftover files and the like
11561da177e4SLinus Torvalds
11571da177e4SLinus Torvalds# Directories & files removed with 'make clean'
11581da177e4SLinus TorvaldsCLEAN_DIRS  += $(MODVERDIR)
11591da177e4SLinus Torvalds
11601da177e4SLinus Torvalds# Directories & files removed with 'make mrproper'
1161d8ecc5cdSSam RavnborgMRPROPER_DIRS  += include/config usr/include include/generated          \
116279192ca8SJason Cooper		  arch/*/include/generated .tmp_objdiff
1163d183e6f5SDavid HowellsMRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1164d5b71936SRusty Russell		  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1165d5b71936SRusty Russell		  signing_key.priv signing_key.x509 x509.genkey		\
1166d5b71936SRusty Russell		  extra_certificates signing_key.x509.keyid		\
11679c8cdb71SPaul Gortmaker		  signing_key.x509.signer include/linux/version.h
11681da177e4SLinus Torvalds
11691da177e4SLinus Torvalds# clean - Delete most, but leave enough to build external modules
11701da177e4SLinus Torvalds#
11711da177e4SLinus Torvaldsclean: rm-dirs  := $(CLEAN_DIRS)
11721da177e4SLinus Torvaldsclean: rm-files := $(CLEAN_FILES)
1173fb68d4beSGerard Snitselaarclean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
11741da177e4SLinus Torvalds
1175bd1ee804SPawel MollPHONY += $(clean-dirs) clean archclean vmlinuxclean
11761da177e4SLinus Torvalds$(clean-dirs):
11771da177e4SLinus Torvalds	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
11781da177e4SLinus Torvalds
1179bd1ee804SPawel Mollvmlinuxclean:
1180bd1ee804SPawel Moll	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1181bd1ee804SPawel Moll
1182bd1ee804SPawel Mollclean: archclean vmlinuxclean
11831da177e4SLinus Torvalds
11841da177e4SLinus Torvalds# mrproper - Delete all generated files, including .config
11851da177e4SLinus Torvalds#
11861da177e4SLinus Torvaldsmrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
11871da177e4SLinus Torvaldsmrproper: rm-files := $(wildcard $(MRPROPER_FILES))
11881da177e4SLinus Torvaldsmrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
11891da177e4SLinus Torvalds
11904f193362SPaul SmithPHONY += $(mrproper-dirs) mrproper archmrproper
11911da177e4SLinus Torvalds$(mrproper-dirs):
11921da177e4SLinus Torvalds	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
11931da177e4SLinus Torvalds
11941da177e4SLinus Torvaldsmrproper: clean archmrproper $(mrproper-dirs)
11951da177e4SLinus Torvalds	$(call cmd,rmdirs)
11961da177e4SLinus Torvalds	$(call cmd,rmfiles)
11971da177e4SLinus Torvalds
11981da177e4SLinus Torvalds# distclean
11991da177e4SLinus Torvalds#
12004f193362SPaul SmithPHONY += distclean
12011da177e4SLinus Torvalds
12021da177e4SLinus Torvaldsdistclean: mrproper
12031da177e4SLinus Torvalds	@find $(srctree) $(RCS_FIND_IGNORE) \
12041da177e4SLinus Torvalds		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
12051da177e4SLinus Torvalds		-o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1206a03fcb50SMasahiro Yamada		-o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
12071da177e4SLinus Torvalds		-type f -print | xargs rm -f
12081da177e4SLinus Torvalds
12091da177e4SLinus Torvalds
12101da177e4SLinus Torvalds# Packaging of the kernel to various formats
12111da177e4SLinus Torvalds# ---------------------------------------------------------------------------
12121da177e4SLinus Torvalds# rpm target kept for backward compatibility
1213c79624c1SMichal Marekpackage-dir	:= scripts/package
12141da177e4SLinus Torvalds
1215bafb6747SArnaldo Carvalho de Melo%src-pkg: FORCE
1216bafb6747SArnaldo Carvalho de Melo	$(Q)$(MAKE) $(build)=$(package-dir) $@
1217031ecc6dSZach Brown%pkg: include/config/kernel.release FORCE
12186c2133e1SSam Ravnborg	$(Q)$(MAKE) $(build)=$(package-dir) $@
1219031ecc6dSZach Brownrpm: include/config/kernel.release FORCE
12206c2133e1SSam Ravnborg	$(Q)$(MAKE) $(build)=$(package-dir) $@
12211da177e4SLinus Torvalds
12221da177e4SLinus Torvalds
12231da177e4SLinus Torvalds# Brief documentation of the typical targets used
12241da177e4SLinus Torvalds# ---------------------------------------------------------------------------
12251da177e4SLinus Torvalds
12265dffbe81SSegher Boessenkoolboards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
12271da177e4SLinus Torvaldsboards := $(notdir $(boards))
12285dffbe81SSegher Boessenkoolboard-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
12295dffbe81SSegher Boessenkoolboard-dirs := $(sort $(notdir $(board-dirs:/=)))
12301da177e4SLinus Torvalds
12311da177e4SLinus Torvaldshelp:
12321da177e4SLinus Torvalds	@echo  'Cleaning targets:'
12335ea084efSSamuel Tardieu	@echo  '  clean		  - Remove most generated files but keep the config and'
12345cc8d246SJesper Juhl	@echo  '                    enough build support to build external modules'
12355ea084efSSamuel Tardieu	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
12365cc8d246SJesper Juhl	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
12371da177e4SLinus Torvalds	@echo  ''
12381da177e4SLinus Torvalds	@echo  'Configuration targets:'
12391da177e4SLinus Torvalds	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
12401da177e4SLinus Torvalds	@echo  ''
12411da177e4SLinus Torvalds	@echo  'Other generic targets:'
12421da177e4SLinus Torvalds	@echo  '  all		  - Build all targets marked with [*]'
12431da177e4SLinus Torvalds	@echo  '* vmlinux	  - Build the bare kernel'
12441da177e4SLinus Torvalds	@echo  '* modules	  - Build all modules'
12459cc5d74cSBodo Eggert	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
124688ecf814SDavid Woodhouse	@echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
124788ecf814SDavid Woodhouse	@echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
12481da177e4SLinus Torvalds	@echo  '  dir/            - Build all files in dir and below'
124962718979SJoe Perches	@echo  '  dir/file.[oisS] - Build specified target only'
125062718979SJoe Perches	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
125162718979SJoe Perches	@echo  '                    (requires a recent binutils and recent build (System.map))'
1252155ad605SSam Ravnborg	@echo  '  dir/file.ko     - Build module including final link'
1253c4d5ee67SRobert P. J. Day	@echo  '  modules_prepare - Set up for building external modules'
12541da177e4SLinus Torvalds	@echo  '  tags/TAGS	  - Generate tags file for editors'
12551da177e4SLinus Torvalds	@echo  '  cscope	  - Generate cscope index'
1256f4ed1009SJianbin Kang	@echo  '  gtags           - Generate GNU GLOBAL index'
12573f1d9a6cSMichal Marek	@echo  '  kernelrelease	  - Output the release version string (use with make -s)'
12583f1d9a6cSMichal Marek	@echo  '  kernelversion	  - Output the version stored in Makefile (use with make -s)'
12593f1d9a6cSMichal Marek	@echo  '  image_name	  - Output the image name (use with make -s)'
12602fb9b1bdSSam Ravnborg	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
126159df3230SGeert Uytterhoeven	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
12622fb9b1bdSSam Ravnborg	 echo  ''
12631da177e4SLinus Torvalds	@echo  'Static analysers'
12641da177e4SLinus Torvalds	@echo  '  checkstack      - Generate a list of stack hogs'
12651da177e4SLinus Torvalds	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1266aa025e7dSSam Ravnborg	@echo  '  versioncheck    - Sanity check on version.h usage'
1267ec2d987fSRandy Dunlap	@echo  '  includecheck    - Check for duplicate included header files'
1268295ac051SAdrian Bunk	@echo  '  export_report   - List the usages of all exported symbols'
1269179efcb4SVegard Nossum	@echo  '  headers_check   - Sanity check on exported headers'
127074425eeeSNicolas Palix	@echo  '  headerdep       - Detect inclusion cycles in headers'
127174425eeeSNicolas Palix	@$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
127274425eeeSNicolas Palix	@echo  ''
12735a5da78bSShuah Khan	@echo  'Kernel selftest'
12745a5da78bSShuah Khan	@echo  '  kselftest       - Build and run kernel selftest (run as root)'
12755a5da78bSShuah Khan	@echo  '                    Build, install, and boot kernel before'
12765a5da78bSShuah Khan	@echo  '                    running kselftest on it'
12775a5da78bSShuah Khan	@echo  ''
12781da177e4SLinus Torvalds	@echo  'Kernel packaging:'
12796c2133e1SSam Ravnborg	@$(MAKE) $(build)=$(package-dir) help
12801da177e4SLinus Torvalds	@echo  ''
12811da177e4SLinus Torvalds	@echo  'Documentation targets:'
12821da177e4SLinus Torvalds	@$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
12831da177e4SLinus Torvalds	@echo  ''
128401dee188SAndres Salomon	@echo  'Architecture specific targets ($(SRCARCH)):'
12851da177e4SLinus Torvalds	@$(if $(archhelp),$(archhelp),\
128601dee188SAndres Salomon		echo '  No architecture specific help defined for $(SRCARCH)')
12871da177e4SLinus Torvalds	@echo  ''
12881da177e4SLinus Torvalds	@$(if $(boards), \
12891da177e4SLinus Torvalds		$(foreach b, $(boards), \
12901da177e4SLinus Torvalds		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
12911da177e4SLinus Torvalds		echo '')
12925dffbe81SSegher Boessenkool	@$(if $(board-dirs), \
12935dffbe81SSegher Boessenkool		$(foreach b, $(board-dirs), \
12945dffbe81SSegher Boessenkool		printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
12955dffbe81SSegher Boessenkool		printf "  %-16s - Show all of the above\\n" help-boards; \
12965dffbe81SSegher Boessenkool		echo '')
12971da177e4SLinus Torvalds
12981da177e4SLinus Torvalds	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
129945d506bdSSam Ravnborg	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
13001da177e4SLinus Torvalds	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1301701842e3SDustin Kirkland	@echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1302701842e3SDustin Kirkland	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1303af07ce3eSIngo Molnar	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
130428bc20dcSSam Ravnborg	@echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
130528bc20dcSSam Ravnborg	@echo  '		1: warnings which may be relevant and do not occur too often'
130628bc20dcSSam Ravnborg	@echo  '		2: warnings which occur quite often but may still be relevant'
130728bc20dcSSam Ravnborg	@echo  '		3: more obscure warnings, can most likely be ignored'
1308a6de553dSMichal Marek	@echo  '		Multiple levels can be combined with W=12 or W=123'
13091da177e4SLinus Torvalds	@echo  ''
13101da177e4SLinus Torvalds	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
13111da177e4SLinus Torvalds	@echo  'For further info see the ./README file'
13121da177e4SLinus Torvalds
13131da177e4SLinus Torvalds
13145dffbe81SSegher Boessenkoolhelp-board-dirs := $(addprefix help-,$(board-dirs))
13155dffbe81SSegher Boessenkool
13165dffbe81SSegher Boessenkoolhelp-boards: $(help-board-dirs)
13175dffbe81SSegher Boessenkool
13185dffbe81SSegher Boessenkoolboards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
13195dffbe81SSegher Boessenkool
13205dffbe81SSegher Boessenkool$(help-board-dirs): help-%:
13215dffbe81SSegher Boessenkool	@echo  'Architecture specific targets ($(SRCARCH) $*):'
13225dffbe81SSegher Boessenkool	@$(if $(boards-per-dir), \
13235dffbe81SSegher Boessenkool		$(foreach b, $(boards-per-dir), \
13245dffbe81SSegher Boessenkool		printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
13255dffbe81SSegher Boessenkool		echo '')
13265dffbe81SSegher Boessenkool
13275dffbe81SSegher Boessenkool
13281da177e4SLinus Torvalds# Documentation targets
13291da177e4SLinus Torvalds# ---------------------------------------------------------------------------
13301da177e4SLinus Torvalds%docs: scripts_basic FORCE
1331bffd2020SPeter Foley	$(Q)$(MAKE) $(build)=scripts build_docproc
13321da177e4SLinus Torvalds	$(Q)$(MAKE) $(build)=Documentation/DocBook $@
13331da177e4SLinus Torvalds
13341da177e4SLinus Torvaldselse # KBUILD_EXTMOD
13351da177e4SLinus Torvalds
13361da177e4SLinus Torvalds###
13371da177e4SLinus Torvalds# External module support.
13381da177e4SLinus Torvalds# When building external modules the kernel used as basis is considered
13391da177e4SLinus Torvalds# read-only, and no consistency checks are made and the make
13401da177e4SLinus Torvalds# system is not used on the basis kernel. If updates are required
13411da177e4SLinus Torvalds# in the basis kernel ordinary make commands (without M=...) must
13421da177e4SLinus Torvalds# be used.
13431da177e4SLinus Torvalds#
13441da177e4SLinus Torvalds# The following are the only valid targets when building external
13451da177e4SLinus Torvalds# modules.
13461da177e4SLinus Torvalds# make M=dir clean     Delete all automatically generated files
13471da177e4SLinus Torvalds# make M=dir modules   Make all modules in specified dir
13481da177e4SLinus Torvalds# make M=dir	       Same as 'make M=dir modules'
13491da177e4SLinus Torvalds# make M=dir modules_install
1350070b98bfSSam Ravnborg#                      Install the modules built in the module directory
13511da177e4SLinus Torvalds#                      Assumes install directory is already created
13521da177e4SLinus Torvalds
13531da177e4SLinus Torvalds# We are always building modules
13541da177e4SLinus TorvaldsKBUILD_MODULES := 1
13554f193362SPaul SmithPHONY += crmodverdir
13561da177e4SLinus Torvaldscrmodverdir:
13577bb9d092SSam Ravnborg	$(cmd_crmodverdir)
13581da177e4SLinus Torvalds
13594f193362SPaul SmithPHONY += $(objtree)/Module.symvers
13601da177e4SLinus Torvalds$(objtree)/Module.symvers:
13611da177e4SLinus Torvalds	@test -e $(objtree)/Module.symvers || ( \
13621da177e4SLinus Torvalds	echo; \
13631da177e4SLinus Torvalds	echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
13641da177e4SLinus Torvalds	echo "           is missing; modules will have no dependencies and modversions."; \
13651da177e4SLinus Torvalds	echo )
13661da177e4SLinus Torvalds
13671da177e4SLinus Torvaldsmodule-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
13684f193362SPaul SmithPHONY += $(module-dirs) modules
13691da177e4SLinus Torvalds$(module-dirs): crmodverdir $(objtree)/Module.symvers
13701da177e4SLinus Torvalds	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
13711da177e4SLinus Torvalds
13721da177e4SLinus Torvaldsmodules: $(module-dirs)
1373fd54f502SMike Frysinger	@$(kecho) '  Building modules, stage 2.';
1374b805aa0eSSam Ravnborg	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
13751da177e4SLinus Torvalds
13764f193362SPaul SmithPHONY += modules_install
1377a67dc21aSSam Ravnborgmodules_install: _emodinst_ _emodinst_post
1378a67dc21aSSam Ravnborg
1379a67dc21aSSam Ravnborginstall-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
13804f193362SPaul SmithPHONY += _emodinst_
1381a67dc21aSSam Ravnborg_emodinst_:
1382a67dc21aSSam Ravnborg	$(Q)mkdir -p $(MODLIB)/$(install-dir)
1383b805aa0eSSam Ravnborg	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
13841da177e4SLinus Torvalds
13854f193362SPaul SmithPHONY += _emodinst_post
1386a67dc21aSSam Ravnborg_emodinst_post: _emodinst_
1387a67dc21aSSam Ravnborg	$(call cmd,depmod)
1388a67dc21aSSam Ravnborg
13891da177e4SLinus Torvaldsclean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
13901da177e4SLinus Torvalds
13914f193362SPaul SmithPHONY += $(clean-dirs) clean
13921da177e4SLinus Torvalds$(clean-dirs):
13931da177e4SLinus Torvalds	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
13941da177e4SLinus Torvalds
13951da177e4SLinus Torvaldsclean:	rm-dirs := $(MODVERDIR)
139688d7be03SMichal Marekclean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
13971da177e4SLinus Torvalds
13981da177e4SLinus Torvaldshelp:
13991da177e4SLinus Torvalds	@echo  '  Building external modules.'
14001da177e4SLinus Torvalds	@echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
14011da177e4SLinus Torvalds	@echo  ''
14021da177e4SLinus Torvalds	@echo  '  modules         - default target, build the module(s)'
14031da177e4SLinus Torvalds	@echo  '  modules_install - install the module'
14041da177e4SLinus Torvalds	@echo  '  clean           - remove generated files in module directory only'
14051da177e4SLinus Torvalds	@echo  ''
140606300b21SSam Ravnborg
140706300b21SSam Ravnborg# Dummies...
14084f193362SPaul SmithPHONY += prepare scripts
140906300b21SSam Ravnborgprepare: ;
141006300b21SSam Ravnborgscripts: ;
14111da177e4SLinus Torvaldsendif # KBUILD_EXTMOD
14121da177e4SLinus Torvalds
141388d7be03SMichal Marekclean: $(clean-dirs)
141488d7be03SMichal Marek	$(call cmd,rmdirs)
141588d7be03SMichal Marek	$(call cmd,rmfiles)
141643f67c98SKevin Cernekee	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
141788d7be03SMichal Marek		\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1418addbcdbbSDavid Howells		-o -name '*.ko.*' \
1419866ced95SAndi Kleen		-o -name '*.dwo'  \
142088d7be03SMichal Marek		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
142188d7be03SMichal Marek		-o -name '*.symtypes' -o -name 'modules.order' \
142288d7be03SMichal Marek		-o -name modules.builtin -o -name '.tmp_*.o.*' \
142388d7be03SMichal Marek		-o -name '*.gcno' \) -type f -print | xargs rm -f
142488d7be03SMichal Marek
14251da177e4SLinus Torvalds# Generate tags for editors
14261da177e4SLinus Torvalds# ---------------------------------------------------------------------------
1427a680eedcSSam Ravnborgquiet_cmd_tags = GEN     $@
1428a680eedcSSam Ravnborg      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
14291da177e4SLinus Torvalds
1430f4ed1009SJianbin Kangtags TAGS cscope gtags: FORCE
14311da177e4SLinus Torvalds	$(call cmd,tags)
14321da177e4SLinus Torvalds
14331da177e4SLinus Torvalds# Scripts to check various things for consistency
14341da177e4SLinus Torvalds# ---------------------------------------------------------------------------
14351da177e4SLinus Torvalds
1436279f3dd3SPeter FoleyPHONY += includecheck versioncheck coccicheck namespacecheck export_report
1437279f3dd3SPeter Foley
14381da177e4SLinus Torvaldsincludecheck:
1439436f876cSPeter Foley	find $(srctree)/* $(RCS_FIND_IGNORE) \
14401da177e4SLinus Torvalds		-name '*.[hcS]' -type f -print | sort \
144180007434SGeert Uytterhoeven		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
14421da177e4SLinus Torvalds
14431da177e4SLinus Torvaldsversioncheck:
14442ee2d292SPeter Foley	find $(srctree)/* $(RCS_FIND_IGNORE) \
14451da177e4SLinus Torvalds		-name '*.[hcS]' -type f -print | sort \
144680007434SGeert Uytterhoeven		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
14471da177e4SLinus Torvalds
144874425eeeSNicolas Palixcoccicheck:
144974425eeeSNicolas Palix	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
145074425eeeSNicolas Palix
14511da177e4SLinus Torvaldsnamespacecheck:
14521da177e4SLinus Torvalds	$(PERL) $(srctree)/scripts/namespace.pl
14531da177e4SLinus Torvalds
1454295ac051SAdrian Bunkexport_report:
1455295ac051SAdrian Bunk	$(PERL) $(srctree)/scripts/export_report.pl
1456295ac051SAdrian Bunk
14571da177e4SLinus Torvaldsendif #ifeq ($(config-targets),1)
14581da177e4SLinus Torvaldsendif #ifeq ($(mixed-targets),1)
14591da177e4SLinus Torvalds
1460c398ff00SMike MarciniszynPHONY += checkstack kernelrelease kernelversion image_name
1461e3ccf6e3SJeff Dike
1462011e3a9aSJeff Dike# UML needs a little special treatment here.  It wants to use the host
1463011e3a9aSJeff Dike# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1464011e3a9aSJeff Dike# else wants $(ARCH), including people doing cross-builds, which means
1465011e3a9aSJeff Dike# that $(SUBARCH) doesn't work here.
1466011e3a9aSJeff Dikeifeq ($(ARCH), um)
1467011e3a9aSJeff DikeCHECKSTACK_ARCH := $(SUBARCH)
1468011e3a9aSJeff Dikeelse
1469011e3a9aSJeff DikeCHECKSTACK_ARCH := $(ARCH)
1470011e3a9aSJeff Dikeendif
14711da177e4SLinus Torvaldscheckstack:
14721da177e4SLinus Torvalds	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1473011e3a9aSJeff Dike	$(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
14741da177e4SLinus Torvalds
14757b8ea53dSAmerigo Wangkernelrelease:
14767b8ea53dSAmerigo Wang	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
147701ab1788SAmerigo Wang
1478cb58455cSSam Ravnborgkernelversion:
14792244cbd8SSam Ravnborg	@echo $(KERNELVERSION)
14801da177e4SLinus Torvalds
1481c398ff00SMike Marciniszynimage_name:
1482c398ff00SMike Marciniszyn	@echo $(KBUILD_IMAGE)
1483c398ff00SMike Marciniszyn
1484ea01fa9fSBorislav Petkov# Clear a bunch of variables before executing the submake
1485ea01fa9fSBorislav Petkovtools/: FORCE
1486bf35182fSDavid Howells	$(Q)mkdir -p $(objtree)/tools
1487a50e4333SBorislav Petkov	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1488ea01fa9fSBorislav Petkov
1489ea01fa9fSBorislav Petkovtools/%: FORCE
1490bf35182fSDavid Howells	$(Q)mkdir -p $(objtree)/tools
1491a50e4333SBorislav Petkov	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1492ea01fa9fSBorislav Petkov
149306300b21SSam Ravnborg# Single targets
149406300b21SSam Ravnborg# ---------------------------------------------------------------------------
1495bc2546a6SSam Ravnborg# Single targets are compatible with:
1496e1b8513dSRobert P. J. Day# - build with mixed source and output
1497bc2546a6SSam Ravnborg# - build with separate output dir 'make O=...'
1498bc2546a6SSam Ravnborg# - external modules
1499bc2546a6SSam Ravnborg#
1500bc2546a6SSam Ravnborg#  target-dir => where to store outputfile
1501bc2546a6SSam Ravnborg#  build-dir  => directory in kernel source tree to use
150206300b21SSam Ravnborg
150306300b21SSam Ravnborgifeq ($(KBUILD_EXTMOD),)
1504aa360879SSam Ravnborg        build-dir  = $(patsubst %/,%,$(dir $@))
1505bc2546a6SSam Ravnborg        target-dir = $(dir $@)
150606300b21SSam Ravnborgelse
150706300b21SSam Ravnborg        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1508bc2546a6SSam Ravnborg        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1509bc2546a6SSam Ravnborg        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
151006300b21SSam Ravnborgendif
151106300b21SSam Ravnborg
1512bc2546a6SSam Ravnborg%.s: %.c prepare scripts FORCE
1513bc2546a6SSam Ravnborg	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1514bc2546a6SSam Ravnborg%.i: %.c prepare scripts FORCE
1515bc2546a6SSam Ravnborg	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1516bc2546a6SSam Ravnborg%.o: %.c prepare scripts FORCE
1517bc2546a6SSam Ravnborg	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1518bc2546a6SSam Ravnborg%.lst: %.c prepare scripts FORCE
1519bc2546a6SSam Ravnborg	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1520bc2546a6SSam Ravnborg%.s: %.S prepare scripts FORCE
1521bc2546a6SSam Ravnborg	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1522bc2546a6SSam Ravnborg%.o: %.S prepare scripts FORCE
1523bc2546a6SSam Ravnborg	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
152415fde675SAndreas Gruenbacher%.symtypes: %.c prepare scripts FORCE
152515fde675SAndreas Gruenbacher	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1526bc2546a6SSam Ravnborg
1527bc2546a6SSam Ravnborg# Modules
152831110ebbSSam Ravnborg/: prepare scripts FORCE
152931110ebbSSam Ravnborg	$(cmd_crmodverdir)
153031110ebbSSam Ravnborg	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
153131110ebbSSam Ravnborg	$(build)=$(build-dir)
153231110ebbSSam Ravnborg%/: prepare scripts FORCE
15337bb9d092SSam Ravnborg	$(cmd_crmodverdir)
153406300b21SSam Ravnborg	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1535bc2546a6SSam Ravnborg	$(build)=$(build-dir)
1536bc2546a6SSam Ravnborg%.ko: prepare scripts FORCE
15377bb9d092SSam Ravnborg	$(cmd_crmodverdir)
153806300b21SSam Ravnborg	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1539bc2546a6SSam Ravnborg	$(build)=$(build-dir) $(@:.ko=.o)
1540b805aa0eSSam Ravnborg	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
154106300b21SSam Ravnborg
15421da177e4SLinus Torvalds# FIXME Should go into a make.lib or something
15431da177e4SLinus Torvalds# ===========================================================================
15441da177e4SLinus Torvalds
15451da177e4SLinus Torvaldsquiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
15461da177e4SLinus Torvalds      cmd_rmdirs = rm -rf $(rm-dirs)
15471da177e4SLinus Torvalds
15481da177e4SLinus Torvaldsquiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
15491da177e4SLinus Torvalds      cmd_rmfiles = rm -f $(rm-files)
15501da177e4SLinus Torvalds
1551bc3c26feSUwe Kleine-König# Run depmod only if we have System.map and depmod is executable
155250a8ec31SSam Ravnborgquiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1553569658ddSMichal Marek      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1554b92021b0SRusty Russell                   $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
155550a8ec31SSam Ravnborg
15567bb9d092SSam Ravnborg# Create temporary dir for module support files
1557ab19f879SSam Ravnborg# clean it up only when building all modules
1558ab19f879SSam Ravnborgcmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1559ab19f879SSam Ravnborg                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
15601da177e4SLinus Torvalds
15611da177e4SLinus Torvalds# read all saved command lines
15621da177e4SLinus Torvalds
15631da177e4SLinus Torvaldstargets := $(wildcard $(sort $(targets)))
15641da177e4SLinus Torvaldscmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
15651da177e4SLinus Torvalds
15661da177e4SLinus Torvaldsifneq ($(cmd_files),)
15671da177e4SLinus Torvalds  $(cmd_files): ;	# Do not try to update included dependency files
15681da177e4SLinus Torvalds  include $(cmd_files)
15691da177e4SLinus Torvaldsendif
15701da177e4SLinus Torvalds
15711da177e4SLinus Torvalds# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
15721da177e4SLinus Torvalds# Usage:
15731da177e4SLinus Torvalds# $(Q)$(MAKE) $(clean)=dir
15741da177e4SLinus Torvaldsclean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
15751da177e4SLinus Torvalds
15761da177e4SLinus Torvaldsendif	# skip-makefile
15771da177e4SLinus Torvalds
15784f193362SPaul SmithPHONY += FORCE
15791da177e4SLinus TorvaldsFORCE:
15804f193362SPaul Smith
15814f193362SPaul Smith# Declare the contents of the .PHONY variable as phony.  We keep that
1582fe8d0a41SKirill Smelkov# information in a variable so we can use it in if_changed and friends.
15834f193362SPaul Smith.PHONY: $(PHONY)
1584