blob: 51ed29502c5fbe4b77c9e6fc217cf10c75da0b81 [file] [log] [blame]
Linus Torvaldsc517d832015-02-22 18:21:14 -08001VERSION = 4
Linus Torvaldsf55532a2016-03-26 16:03:24 -07002PATCHLEVEL = 6
Linus Torvalds55922c92011-05-29 17:43:36 -07003SUBLEVEL = 0
Linus Torvaldsf55532a2016-03-26 16:03:24 -07004EXTRAVERSION = -rc1
Linus Torvalds25cb62b2015-10-11 11:09:45 -07005NAME = Blurry Fish Butt
Linus Torvalds1da177e2005-04-16 15:20:36 -07006
7# *DOCUMENTATION*
8# To see a list of typical targets execute "make help"
9# More info can be located in ./README
10# Comments in this file are targeted only to the developer, do not
11# expect to learn how to build the kernel reading this file.
12
Masahiro Yamadaa436bb72015-03-27 20:43:36 +090013# o Do not use make's built-in rules and variables
14# (this increases performance and avoids hard-to-debug behaviour);
15# o Look for make include files relative to root of kernel src
16MAKEFLAGS += -rR --include-dir=$(CURDIR)
Linus Torvalds1da177e2005-04-16 15:20:36 -070017
H. Peter Anvinc0513462009-12-17 06:56:11 -080018# Avoid funny character set dependencies
H. Peter Anvin06b5dc62009-12-17 15:51:37 -080019unexport LC_ALL
H. Peter Anvinc0513462009-12-17 06:56:11 -080020LC_COLLATE=C
21LC_NUMERIC=C
Michal Marek07105202010-01-08 12:25:37 +010022export LC_COLLATE LC_NUMERIC
H. Peter Anvinc0513462009-12-17 06:56:11 -080023
Borislav Petkovab7474e2013-11-11 15:27:43 +010024# Avoid interference with shell env settings
25unexport GREP_OPTIONS
26
Linus Torvalds1da177e2005-04-16 15:20:36 -070027# We are using a recursive build, so we need to do a little thinking
28# to get the ordering right.
29#
30# Most importantly: sub-Makefiles should only ever modify files in
31# their own directory. If in some directory we have a dependency on
32# a file in another dir (which doesn't happen often, but it's often
33# unavoidable when linking the built-in.o targets which finally
34# turn into vmlinux), we will call a sub make in that other dir, and
35# after that we are sure that everything which is in that other dir
36# is now up to date.
37#
38# The only cases where we need to modify files which have global
39# effects are thus separated out and done before the recursive
40# descending is started. They are now explicitly listed as the
41# prepare rule.
42
Michal Marek066b7ed2014-07-04 14:29:30 +020043# Beautify output
44# ---------------------------------------------------------------------------
45#
46# Normally, we echo the whole command before executing it. By making
47# that echo $($(quiet)$(cmd)), we now have the possibility to set
48# $(quiet) to choose other forms of output instead, e.g.
49#
50# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
51# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
52#
53# If $(quiet) is empty, the whole command will be printed.
54# If it is set to "quiet_", only the short version will be printed.
55# If it is set to "silent_", nothing will be printed at all, since
56# the variable $(silent_cmd_cc_o_c) doesn't exist.
57#
58# A simple variant is to prefix commands with $(Q) - that's useful
59# for commands that shall be hidden in non-verbose mode.
60#
61# $(Q)ln $@ :<
62#
63# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
64# If KBUILD_VERBOSE equals 1 then the above command is displayed.
65#
Linus Torvalds1da177e2005-04-16 15:20:36 -070066# To put more focus on warnings, be less verbose as default
67# Use 'make V=1' to see the full commands
68
Cheng Renquanb8b06182009-05-26 16:03:07 +080069ifeq ("$(origin V)", "command line")
70 KBUILD_VERBOSE = $(V)
Linus Torvalds1da177e2005-04-16 15:20:36 -070071endif
72ifndef KBUILD_VERBOSE
73 KBUILD_VERBOSE = 0
74endif
75
Michal Marek066b7ed2014-07-04 14:29:30 +020076ifeq ($(KBUILD_VERBOSE),1)
77 quiet =
78 Q =
79else
80 quiet=quiet_
81 Q = @
82endif
83
84# If the user is running make -s (silent mode), suppress echoing of
85# commands
86
87ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
88ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
89 quiet=silent_
90endif
91else # make-3.8x
92ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
93 quiet=silent_
94endif
95endif
96
97export quiet Q KBUILD_VERBOSE
98
Linus Torvalds1da177e2005-04-16 15:20:36 -070099# kbuild supports saving output files in a separate directory.
100# To locate output files in a separate directory two syntaxes are supported.
101# In both cases the working directory must be the root of the kernel src.
102# 1) O=
103# Use "make O=dir/to/store/output/files/"
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200104#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105# 2) Set KBUILD_OUTPUT
106# Set the environment variable KBUILD_OUTPUT to point to the directory
107# where the output files shall be placed.
108# export KBUILD_OUTPUT=dir/to/store/output/files/
109# make
110#
111# The O= assignment takes precedence over the KBUILD_OUTPUT environment
112# variable.
113
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114# KBUILD_SRC is set on invocation of make in OBJ directory
115# KBUILD_SRC is not intended to be used by the regular user (for now)
116ifeq ($(KBUILD_SRC),)
117
118# OK, Make called in directory where kernel src resides
119# Do we want to locate output files in a separate directory?
Cheng Renquanb8b06182009-05-26 16:03:07 +0800120ifeq ("$(origin O)", "command line")
121 KBUILD_OUTPUT := $(O)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122endif
123
124# That's our default target when none is given on the command line
Paul Smith4f193362006-03-05 17:14:10 -0500125PHONY := _all
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126_all:
127
Sam Ravnborg1cacc9a2007-12-06 22:20:11 +0100128# Cancel implicit rules on top Makefile
129$(CURDIR)/Makefile Makefile: ;
130
Robert Jarzmik51193b72016-04-02 21:38:53 +0200131ifneq ($(words $(subst :, ,$(CURDIR))), 1)
132 $(error main directory cannot contain spaces nor colons)
133endif
134
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135ifneq ($(KBUILD_OUTPUT),)
136# Invoke a second make in the output directory, passing relevant variables
137# check that the output directory actually exists
138saved-output := $(KBUILD_OUTPUT)
Masahiro Yamada1c9e70a2014-03-31 16:41:36 +0900139KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
140 && /bin/pwd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141$(if $(KBUILD_OUTPUT),, \
Masahiro Yamada1c9e70a2014-03-31 16:41:36 +0900142 $(error failed to create output directory "$(saved-output)"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
Milton Miller0b357862007-09-21 18:09:02 -0500144PHONY += $(MAKECMDGOALS) sub-make
145
Sam Ravnborg1cacc9a2007-12-06 22:20:11 +0100146$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
Charles Keepax16f89092012-10-15 13:49:12 +0100147 @:
Milton Miller0b357862007-09-21 18:09:02 -0500148
Masahiro Yamada2e8d6962016-03-13 09:13:55 +0900149sub-make:
Masahiro Yamada745a2542014-09-09 20:02:23 +0900150 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
Masahiro Yamadaaa55c8e2014-09-09 20:02:24 +0900151 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152
153# Leave processing to above invocation of make
154skip-makefile := 1
155endif # ifneq ($(KBUILD_OUTPUT),)
156endif # ifeq ($(KBUILD_SRC),)
157
158# We process the rest of the Makefile if this is the final invocation of make
159ifeq ($(skip-makefile),)
160
Masahiro Yamada7ff52572014-09-09 20:02:22 +0900161# Do not print "Entering directory ...",
162# but we want to display it when entering to the output directory
163# so that IDEs/editors are able to understand relative filenames.
164MAKEFLAGS += --no-print-directory
165
Masahiro Yamadaaa55c8e2014-09-09 20:02:24 +0900166# Call a source code checker (by default, "sparse") as part of the
167# C compilation.
168#
169# Use 'make C=1' to enable checking of only re-compiled files.
170# Use 'make C=2' to enable checking of *all* source files, regardless
171# of whether they are re-compiled or not.
172#
173# See the file "Documentation/sparse.txt" for more details, including
174# where to get the "sparse" utility.
175
176ifeq ("$(origin C)", "command line")
177 KBUILD_CHECKSRC = $(C)
178endif
179ifndef KBUILD_CHECKSRC
180 KBUILD_CHECKSRC = 0
181endif
182
183# Use make M=dir to specify directory of external module to build
184# Old syntax make ... SUBDIRS=$PWD is still supported
185# Setting the environment variable KBUILD_EXTMOD take precedence
186ifdef SUBDIRS
187 KBUILD_EXTMOD ?= $(SUBDIRS)
188endif
189
190ifeq ("$(origin M)", "command line")
191 KBUILD_EXTMOD := $(M)
192endif
193
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194# If building an external module we do not care about the all: rule
195# but instead _all depend on modules
Paul Smith4f193362006-03-05 17:14:10 -0500196PHONY += all
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197ifeq ($(KBUILD_EXTMOD),)
198_all: all
199else
200_all: modules
201endif
202
Michal Marek9da07632014-04-25 23:25:18 +0200203ifeq ($(KBUILD_SRC),)
204 # building in the source tree
205 srctree := .
206else
207 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
208 # building in a subdirectory of the source tree
209 srctree := ..
210 else
211 srctree := $(KBUILD_SRC)
212 endif
213endif
Michal Marek7e1c0472014-04-25 17:29:45 +0200214objtree := .
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215src := $(srctree)
216obj := $(objtree)
217
Mattia Dongili0f558c32006-02-19 13:50:37 +0100218VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219
Amerigo Wang11294232009-06-19 03:40:26 -0400220export srctree objtree VPATH
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222# SUBARCH tells the usermode build what the underlying arch is. That is set
223# first, and if a usermode build is happening, the "ARCH=um" on the command
224# line overrides the setting of ARCH below. If a native build is happening,
Masahiro Yamada38385f82014-04-28 16:26:18 +0900225# then ARCH is assigned, getting whatever value it gets normally, and
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226# SUBARCH is subsequently ignored.
227
David Woodhouseffee0de2012-12-20 21:51:55 +0000228SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
229 -e s/sun4u/sparc64/ \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 -e s/arm.*/arm/ -e s/sa110/arm/ \
Linus Torvalds39990b52005-11-11 14:27:32 -0800231 -e s/s390x/s390/ -e s/parisc64/parisc/ \
Paul Mundt236b1952007-11-02 12:22:47 +0900232 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
Will Deaconf1b99392013-01-18 19:00:47 +0000233 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
235# Cross compiling and selecting different set of gcc/bin-utils
236# ---------------------------------------------------------------------------
237#
238# When performing cross compilation for other architectures ARCH shall be set
239# to the target architecture. (See arch/* for the possibilities).
240# ARCH can be set during invocation of make:
241# make ARCH=ia64
242# Another way is to have ARCH set in the environment.
243# The default ARCH is the host where make is executed.
244
245# CROSS_COMPILE specify the prefix used for all executables used
246# during compilation. Only gcc and related bin-utils executables
247# are prefixed with $(CROSS_COMPILE).
248# CROSS_COMPILE can be set on the command line
249# make CROSS_COMPILE=ia64-linux-
250# Alternatively CROSS_COMPILE can be set in the environment.
Roland McGrath84336462009-12-21 16:24:06 -0800251# A third alternative is to store a setting in .config so that plain
252# "make" in the configured kernel build directory always uses that.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253# Default value for CROSS_COMPILE is not to prefix executables
254# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
Sam Ravnborg2331d1a2009-10-11 23:22:58 +0200255ARCH ?= $(SUBARCH)
Roland McGrath84336462009-12-21 16:24:06 -0800256CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
258# Architecture as present in compile.h
Thomas Gleixner6752ed92007-10-11 11:11:36 +0200259UTS_MACHINE := $(ARCH)
260SRCARCH := $(ARCH)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261
Sam Ravnborgd746d642007-11-12 20:14:19 +0100262# Additional ARCH settings for x86
263ifeq ($(ARCH),i386)
264 SRCARCH := x86
265endif
266ifeq ($(ARCH),x86_64)
267 SRCARCH := x86
268endif
Sam Ravnborg74b469f2007-10-25 19:42:04 +0200269
Sam Ravnborg5e538792008-12-02 23:17:12 -0800270# Additional ARCH settings for sparc
Namhyung Kime69f58c2010-10-25 05:48:23 +0000271ifeq ($(ARCH),sparc32)
272 SRCARCH := sparc
273endif
Sam Ravnborga439fe52008-07-27 23:00:59 +0200274ifeq ($(ARCH),sparc64)
Sam Ravnborg5e538792008-12-02 23:17:12 -0800275 SRCARCH := sparc
Sam Ravnborga439fe52008-07-27 23:00:59 +0200276endif
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +0200277
Paul Mundt3cc000b2009-04-11 08:39:27 +0900278# Additional ARCH settings for sh
279ifeq ($(ARCH),sh64)
280 SRCARCH := sh
281endif
282
Chris Metcalf18aecc22011-05-04 14:38:26 -0400283# Additional ARCH settings for tile
Chris Metcalf6738d322011-05-25 15:24:00 -0400284ifeq ($(ARCH),tilepro)
285 SRCARCH := tile
286endif
Chris Metcalf18aecc22011-05-04 14:38:26 -0400287ifeq ($(ARCH),tilegx)
288 SRCARCH := tile
289endif
290
Sam Ravnborg5e538792008-12-02 23:17:12 -0800291# Where to locate arch specific headers
292hdr-arch := $(SRCARCH)
293
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700294KCONFIG_CONFIG ?= .config
Ben Gardiner41263fc2010-12-14 11:39:44 -0500295export KCONFIG_CONFIG
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700296
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297# SHELL used by kbuild
298CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
299 else if [ -x /bin/bash ]; then echo /bin/bash; \
300 else echo sh; fi ; fi)
301
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200302HOSTCC = gcc
303HOSTCXX = g++
Kirill A. Shutemov51b97e32014-10-20 12:23:12 +0300304HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200305HOSTCXXFLAGS = -O2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306
Behan Webster61163ef2013-09-03 22:27:23 -0400307ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
308HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
309 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
310endif
311
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200312# Decide whether to build built-in, modular, or both.
313# Normally, just do built-in.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
315KBUILD_MODULES :=
316KBUILD_BUILTIN := 1
317
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +0900318# If we have only "make modules", don't compile built-in objects.
319# When we're building modules with modversions, we need to consider
320# the built-in objects during the descend as well, in order to
321# make sure the checksums are up to date before we record them.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322
323ifeq ($(MAKECMDGOALS),modules)
324 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
325endif
326
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +0900327# If we have "make <whatever> modules", compile modules
328# in addition to whatever we do anyway.
329# Just "make" or "make all" shall build modules as well
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330
331ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
332 KBUILD_MODULES := 1
333endif
334
335ifeq ($(MAKECMDGOALS),)
336 KBUILD_MODULES := 1
337endif
338
Sam Ravnborge579d352005-07-27 08:10:10 +0200339export KBUILD_MODULES KBUILD_BUILTIN
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
341
Sam Ravnborg1cacc9a2007-12-06 22:20:11 +0100342# We need some generic definitions (do not try to remake the file).
Masahiro Yamadaa436bb72015-03-27 20:43:36 +0900343scripts/Kbuild.include: ;
344include scripts/Kbuild.include
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345
346# Make variables (CC, etc...)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347AS = $(CROSS_COMPILE)as
348LD = $(CROSS_COMPILE)ld
349CC = $(CROSS_COMPILE)gcc
350CPP = $(CC) -E
351AR = $(CROSS_COMPILE)ar
352NM = $(CROSS_COMPILE)nm
353STRIP = $(CROSS_COMPILE)strip
354OBJCOPY = $(CROSS_COMPILE)objcopy
355OBJDUMP = $(CROSS_COMPILE)objdump
356AWK = awk
357GENKSYMS = scripts/genksyms/genksyms
Sam Ravnborgcaa27b62009-07-20 21:37:11 +0200358INSTALLKERNEL := installkernel
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359DEPMOD = /sbin/depmod
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360PERL = perl
Masahiro Yamada011bf122014-07-18 13:40:11 +0900361PYTHON = python
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362CHECK = sparse
363
Hannes Eder80a7d1d2008-12-27 22:38:44 +0100364CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
365 -Wbitwise -Wno-return-void $(CF)
Sam Ravnborg65881692010-07-28 17:33:09 +0200366CFLAGS_MODULE =
367AFLAGS_MODULE =
368LDFLAGS_MODULE =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369CFLAGS_KERNEL =
370AFLAGS_KERNEL =
Arnd Bergmanne72e2df2016-04-25 17:35:31 +0200371CFLAGS_GCOV = -fprofile-arcs -ftest-coverage -fno-tree-loop-im -Wno-maybe-uninitialized
Dmitry Vyukov5c9a8752016-03-22 14:27:30 -0700372CFLAGS_KCOV = -fsanitize-coverage=trace-pc
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373
374
David Howellsabbf1592012-10-02 18:01:26 +0100375# Use USERINCLUDE when you must reference the UAPI directories only.
376USERINCLUDE := \
377 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
378 -Iarch/$(hdr-arch)/include/generated/uapi \
379 -I$(srctree)/include/uapi \
380 -Iinclude/generated/uapi \
381 -include $(srctree)/include/linux/kconfig.h
382
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383# Use LINUXINCLUDE when you must reference the include/ directory.
384# Needed to be compatible with the O= option
David Howellsabbf1592012-10-02 18:01:26 +0100385LINUXINCLUDE := \
386 -I$(srctree)/arch/$(hdr-arch)/include \
Michal Marek90ac0862015-01-08 16:16:39 +0100387 -Iarch/$(hdr-arch)/include/generated/uapi \
David Howellsabbf1592012-10-02 18:01:26 +0100388 -Iarch/$(hdr-arch)/include/generated \
389 $(if $(KBUILD_SRC), -I$(srctree)/include) \
390 -Iinclude \
391 $(USERINCLUDE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392
Sam Ravnborgd8672b42008-11-21 21:50:02 +0100393KBUILD_CPPFLAGS := -D__KERNEL__
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200395KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
Dave Jones94bed2a2007-07-15 23:41:38 -0700396 -fno-strict-aliasing -fno-common \
Floris Kraaka8735822009-06-15 08:54:02 +0300397 -Werror-implicit-function-declaration \
Kirill A. Shutemov51b97e32014-10-20 12:23:12 +0300398 -Wno-format-security \
399 -std=gnu89
Geert Uytterhoevena1c48bb2014-05-27 09:54:12 +0200400
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200401KBUILD_AFLAGS_KERNEL :=
402KBUILD_CFLAGS_KERNEL :=
Sam Ravnborg222d3942007-10-15 21:59:31 +0200403KBUILD_AFLAGS := -D__ASSEMBLY__
Sam Ravnborg65881692010-07-28 17:33:09 +0200404KBUILD_AFLAGS_MODULE := -DMODULE
405KBUILD_CFLAGS_MODULE := -DMODULE
406KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700408# Read KERNELRELEASE from include/config/kernel.release (if it exists)
409KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
Michal Marekcacd54e2011-05-30 13:36:07 +0200410KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
Sam Ravnborgcb584552006-01-09 21:20:34 +0100411
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200412export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
Sam Ravnborg80ef88d2007-11-17 15:37:31 +0100413export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
Sam Ravnborgcaa27b62009-07-20 21:37:11 +0200414export CPP AR NM STRIP OBJCOPY OBJDUMP
Masahiro Yamada011bf122014-07-18 13:40:11 +0900415export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200416export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417
Sam Ravnborg06c50402007-10-15 22:17:25 +0200418export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
Dmitry Vyukov5c9a8752016-03-22 14:27:30 -0700419export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
Sam Ravnborg222d3942007-10-15 21:59:31 +0200420export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
Sam Ravnborg65881692010-07-28 17:33:09 +0200421export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200422export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
Michal Marek40df7592011-04-20 13:45:30 +0200423export KBUILD_ARFLAGS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424
425# When compiling out-of-tree modules, put MODVERDIR in the module
426# tree rather than in the kernel tree. The kernel tree might
427# even be read-only.
428export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
429
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430# Files to ignore in find ... statements
431
Prarit Bhargavaae63b2d2014-02-06 07:51:42 -0500432export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
433 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
434 -prune -o
Jesper Juhl450c6072012-02-16 22:49:15 +0100435export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
436 --exclude CVS --exclude .pc --exclude .hg --exclude .git
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437
438# ===========================================================================
439# Rules shared between *config targets and build targets
440
441# Basic helpers built in scripts/
Paul Smith4f193362006-03-05 17:14:10 -0500442PHONY += scripts_basic
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443scripts_basic:
444 $(Q)$(MAKE) $(build)=scripts/basic
Steven Rostedt638adb02009-11-17 10:48:25 -0500445 $(Q)rm -f .tmp_quiet_recordmcount
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446
Jan Beulichcd05e6b2005-09-06 11:47:04 +0200447# To avoid any implicit rule to kick in, define an empty command.
448scripts/basic/%: scripts_basic ;
449
Paul Smith4f193362006-03-05 17:14:10 -0500450PHONY += outputmakefile
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200451# outputmakefile generates a Makefile in the output directory, if using a
452# separate output directory. This allows convenient use of make in the
453# output directory.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454outputmakefile:
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200455ifneq ($(KBUILD_SRC),)
Andi Kleen92979992009-01-10 04:56:13 +0100456 $(Q)ln -fsn $(srctree) source
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200457 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
458 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
459endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460
Sam Ravnborgd8ecc5c2011-04-27 22:29:49 +0200461# Support for using generic headers in asm-generic
462PHONY += asm-generic
463asm-generic:
464 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
Catalin Marinas3c5994c2012-10-17 12:25:44 +0100465 src=asm obj=arch/$(SRCARCH)/include/generated/asm
466 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
467 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
Sam Ravnborgd8ecc5c2011-04-27 22:29:49 +0200468
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469# To make sure we do not include .config for any of the *config targets
470# catch them early, and hand them over to scripts/kconfig/Makefile
471# It is allowed to specify more targets when calling make, including
472# mixing *config targets and build targets.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200473# For example 'make oldconfig all'.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474# Detect when mixed targets is specified, and make a second invocation
475# of make so .config is not included in this case either (for *config).
476
David Howells10b63952012-10-02 18:01:57 +0100477version_h := include/generated/uapi/linux/version.h
Michal Marek223c24a2014-11-27 16:13:17 +0100478old_version_h := include/linux/version.h
David Howellsd183e6f2012-10-02 18:01:56 +0100479
Roman Zippel3eb3c742007-01-10 14:45:28 +0100480no-dot-config-targets := clean mrproper distclean \
Michal Marekfbae4d52014-11-28 13:31:43 +0100481 cscope gtags TAGS tags help% %docs check% coccicheck \
David Howellsd183e6f2012-10-02 18:01:56 +0100482 $(version_h) headers_% archheaders archscripts \
Linus Torvalds4aed2fd2010-08-06 09:30:52 -0700483 kernelversion %src-pkg
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484
485config-targets := 0
486mixed-targets := 0
487dot-config := 1
488
489ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
490 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
491 dot-config := 0
492 endif
493endif
494
495ifeq ($(KBUILD_EXTMOD),)
496 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
497 config-targets := 1
Masahiro Yamadad0d38cd2014-12-11 19:12:34 +0900498 ifneq ($(words $(MAKECMDGOALS)),1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 mixed-targets := 1
500 endif
501 endif
502endif
Michal Mareka85a41e2015-12-10 15:53:06 +0100503# install and module_install need also be processed one by one
504ifneq ($(filter install,$(MAKECMDGOALS)),)
505 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
506 mixed-targets := 1
507 endif
508endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509
510ifeq ($(mixed-targets),1)
511# ===========================================================================
512# We're called with mixed targets (*config and build targets).
513# Handle them one by one.
514
Masahiro Yamada9319f452014-04-09 15:51:35 +0900515PHONY += $(MAKECMDGOALS) __build_one_by_one
516
517$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
518 @:
519
520__build_one_by_one:
521 $(Q)set -e; \
522 for i in $(MAKECMDGOALS); do \
523 $(MAKE) -f $(srctree)/Makefile $$i; \
524 done
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525
526else
527ifeq ($(config-targets),1)
528# ===========================================================================
529# *config targets only - make sure prerequisites are updated, and descend
530# in scripts/kconfig to make the *config target
531
532# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
533# KBUILD_DEFCONFIG may point out an alternative default configuration
534# used for 'make defconfig'
Masahiro Yamadaa436bb72015-03-27 20:43:36 +0900535include arch/$(SRCARCH)/Makefile
Al Viro61bee202008-08-25 04:51:27 -0400536export KBUILD_DEFCONFIG KBUILD_KCONFIG
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537
Sam Ravnborg31110eb2008-12-13 23:00:45 +0100538config: scripts_basic outputmakefile FORCE
Sam Ravnborg31110eb2008-12-13 23:00:45 +0100539 $(Q)$(MAKE) $(build)=scripts/kconfig $@
540
541%config: scripts_basic outputmakefile FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 $(Q)$(MAKE) $(build)=scripts/kconfig $@
543
544else
545# ===========================================================================
546# Build targets only - this includes vmlinux, arch specific targets, clean
547# targets and others. In general all targets except *config targets.
548
549ifeq ($(KBUILD_EXTMOD),)
550# Additional helpers built in scripts/
551# Carefully list dependencies so we do not try to build scripts twice
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200552# in parallel
Paul Smith4f193362006-03-05 17:14:10 -0500553PHONY += scripts
Andreas Schwaba54292f2013-04-09 19:57:00 +0200554scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
555 asm-generic
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 $(Q)$(MAKE) $(build)=$(@)
557
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558# Objects we will link into vmlinux / subdirs we need to visit
559init-y := init/
David Woodhouse4d2acfb2008-05-23 13:58:12 +0100560drivers-y := drivers/ sound/ firmware/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561net-y := net/
562libs-y := lib/
563core-y := usr/
Feng Wu37d9fe42015-09-22 16:47:29 +0800564virt-y := virt/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565endif # KBUILD_EXTMOD
566
567ifeq ($(dot-config),1)
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200568# Read in config
569-include include/config/auto.conf
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200571ifeq ($(KBUILD_EXTMOD),)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572# Read in dependencies to all Kconfig* files, make sure to run
573# oldconfig if changes are detected.
Roman Zippelc955cca2006-06-08 22:12:39 -0700574-include include/config/auto.conf.cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576# To avoid any implicit rule to kick in, define an empty command
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700577$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578
Roman Zippelc955cca2006-06-08 22:12:39 -0700579# If .config is newer than include/config/auto.conf, someone tinkered
Sam Ravnborg752625c2005-12-26 23:34:03 +0100580# with it and forgot to run make oldconfig.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200581# if auto.conf.cmd is missing then we are probably in a cleaned tree so
Sam Ravnborg752625c2005-12-26 23:34:03 +0100582# we execute the config step to be sure to catch updated Kconfig files
Michal Marekbc081dd2009-12-07 16:38:33 +0100583include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
585else
Sam Ravnborg264a2682009-10-18 00:49:24 +0200586# external modules needs include/generated/autoconf.h and include/config/auto.conf
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200587# but do not care if they are up-to-date. Use auto.conf to trigger the test
588PHONY += include/config/auto.conf
589
590include/config/auto.conf:
Sam Ravnborg264a2682009-10-18 00:49:24 +0200591 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
Michal Marek5369f552012-07-07 23:04:40 +0200592 echo >&2; \
593 echo >&2 " ERROR: Kernel configuration is invalid."; \
594 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
595 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
596 echo >&2 ; \
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200597 /bin/false)
598
599endif # KBUILD_EXTMOD
Roman Zippelc955cca2006-06-08 22:12:39 -0700600
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601else
602# Dummy target needed, because used as prerequisite
Roman Zippelc955cca2006-06-08 22:12:39 -0700603include/config/auto.conf: ;
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200604endif # $(dot-config)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605
606# The all: target is the default when no target is given on the
607# command line.
608# This allow a user to issue only 'make' to build a kernel including modules
Michal Marekc8447162010-06-03 10:54:58 +0200609# Defaults to vmlinux, but the arch makefile usually adds further targets
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610all: vmlinux
611
Michal Marek6dd3f132015-07-16 18:23:53 +0200612# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
613# values of the respective KBUILD_* variables
614ARCH_CPPFLAGS :=
615ARCH_AFLAGS :=
616ARCH_CFLAGS :=
Masahiro Yamadaa436bb72015-03-27 20:43:36 +0900617include arch/$(SRCARCH)/Makefile
Geert Uytterhoevena1c48bb2014-05-27 09:54:12 +0200618
619KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
620
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
Arnd Bergmanne74fc972013-02-15 21:23:58 +0100622KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623else
Arnd Bergmann815eb712016-04-25 17:35:28 +0200624ifdef CONFIG_PROFILE_ALL_BRANCHES
625KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,)
626else
627KBUILD_CFLAGS += -O2
628endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629endif
630
Jiri Kosina69102312014-08-06 16:08:43 -0700631# Tell gcc to never replace conditional load with a non-conditional one
632KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
633
Andi Kleen1873e872012-03-28 11:51:18 -0700634ifdef CONFIG_READABLE_ASM
635# Disable optimizations that make assembler listings hard to read.
636# reorder blocks reorders the control in the function
637# ipa clone creates specialized cloned functions
638# partial inlining inlines only parts of functions
639KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
640 $(call cc-option,-fno-ipa-cp-clone,) \
641 $(call cc-option,-fno-partial-inlining)
642endif
643
Mike Frysinger08f67462009-06-04 16:29:08 -0700644ifneq ($(CONFIG_FRAME_WARN),0)
Andi Kleen35bb5b12008-02-22 15:15:03 +0100645KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
646endif
647
Kees Cook19952a92013-12-19 11:35:58 -0800648# Handle stack protector mode.
Kees Cook13324292014-08-06 16:03:31 -0700649#
650# Since kbuild can potentially perform two passes (first with the old
651# .config values and then with updated .config values), we cannot error out
652# if a desired compiler option is unsupported. If we were to error, kbuild
653# could never get to the second pass and actually notice that we changed
654# the option to something that was supported.
655#
656# Additionally, we don't want to fallback and/or silently change which compiler
657# flags will be used, since that leads to producing kernels with different
658# security feature characteristics depending on the compiler used. ("But I
659# selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
660#
661# The middle ground is to warn here so that the failed option is obvious, but
662# to let the build fail with bad compiler flags so that we can't produce a
663# kernel when there is a CONFIG and compiler mismatch.
664#
Kees Cook87796572013-12-19 11:35:59 -0800665ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
Kees Cook19952a92013-12-19 11:35:58 -0800666 stackp-flag := -fstack-protector
667 ifeq ($(call cc-option, $(stackp-flag)),)
Jan Beulich6c15b322014-02-25 15:01:48 -0800668 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
Fathi Boudra27b2a492014-02-25 15:01:46 -0800669 -fstack-protector not supported by compiler)
Kees Cook19952a92013-12-19 11:35:58 -0800670 endif
Jan Beulich6c15b322014-02-25 15:01:48 -0800671else
672ifdef CONFIG_CC_STACKPROTECTOR_STRONG
Kees Cook87796572013-12-19 11:35:59 -0800673 stackp-flag := -fstack-protector-strong
674 ifeq ($(call cc-option, $(stackp-flag)),)
675 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
676 -fstack-protector-strong not supported by compiler)
677 endif
Kees Cook19952a92013-12-19 11:35:58 -0800678else
679 # Force off for distro compilers that enable stack protector by default.
680 stackp-flag := $(call cc-option, -fno-stack-protector)
Tejun Heo5d707e92009-02-09 22:17:39 +0900681endif
Jan Beulich6c15b322014-02-25 15:01:48 -0800682endif
Kees Cook19952a92013-12-19 11:35:58 -0800683KBUILD_CFLAGS += $(stackp-flag)
Sam Ravnborge06b8b92008-02-13 22:43:28 +0100684
Dmitry Vyukov5c9a8752016-03-22 14:27:30 -0700685ifdef CONFIG_KCOV
686 ifeq ($(call cc-option, $(CFLAGS_KCOV)),)
687 $(warning Cannot use CONFIG_KCOV: \
688 -fsanitize-coverage=trace-pc is not supported by compiler)
689 CFLAGS_KCOV =
690 endif
691endif
692
Michal Marek5631d9c2015-08-19 17:36:41 +0200693ifeq ($(cc-name),clang)
Behan Webster61163ef2013-09-03 22:27:23 -0400694KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
695KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
696KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
697KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
698KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
699# Quiet clang warning: comparison of unsigned expression < 0 is always false
700KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
701# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
702# source of a reference will be _MergedGlobals and not on of the whitelisted names.
703# See modpost pattern 2
704KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
Behan Webster26ea6bb2014-07-31 21:08:25 -0700705KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
Behan Webster61163ef2013-09-03 22:27:23 -0400706else
707
Dave Jonesaf0e5d52011-04-21 17:28:13 -0400708# This warning generated too much noise in a regular build.
709# Use make W=1 to enable this warning (see scripts/Makefile.build)
Michal Marek8417da6f2011-05-02 12:51:15 +0200710KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
Behan Webster61163ef2013-09-03 22:27:23 -0400711endif
Dave Jonesaf0e5d52011-04-21 17:28:13 -0400712
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713ifdef CONFIG_FRAME_POINTER
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200714KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715else
Rabin Vincent7e9501f2010-08-10 19:20:53 +0100716# Some targets (ARM with Thumb2, for example), can't be built with frame
717# pointers. For those, we don't have FUNCTION_TRACER automatically
718# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
719# incompatible with -fomit-frame-pointer with current GCC, so we don't use
720# -fomit-frame-pointer with FUNCTION_TRACER.
721ifndef CONFIG_FUNCTION_TRACER
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200722KBUILD_CFLAGS += -fomit-frame-pointer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723endif
Rabin Vincent7e9501f2010-08-10 19:20:53 +0100724endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725
Linus Torvalds2062afb2014-07-26 14:52:01 -0700726KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
727
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728ifdef CONFIG_DEBUG_INFO
Andi Kleen866ced92014-07-30 20:50:18 +0200729ifdef CONFIG_DEBUG_INFO_SPLIT
730KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
731else
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200732KBUILD_CFLAGS += -g
Andi Kleen866ced92014-07-30 20:50:18 +0200733endif
Behan Webster22883282014-02-14 15:19:17 -0800734KBUILD_AFLAGS += -Wa,-gdwarf-2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735endif
Andi Kleenbfaf2dd2014-07-30 20:50:19 +0200736ifdef CONFIG_DEBUG_INFO_DWARF4
737KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
738endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739
Andi Kleend6f4ceb2010-07-14 15:43:52 +0200740ifdef CONFIG_DEBUG_INFO_REDUCED
Andi Kleene82c4bb2013-02-07 13:58:40 -0800741KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
742 $(call cc-option,-fno-var-tracking)
Andi Kleend6f4ceb2010-07-14 15:43:52 +0200743endif
744
Steven Rostedt606576c2008-10-06 19:06:12 -0400745ifdef CONFIG_FUNCTION_TRACER
Heiko Carstensc0a80c02015-01-09 13:06:33 +0100746ifndef CC_FLAGS_FTRACE
747CC_FLAGS_FTRACE := -pg
748endif
749export CC_FLAGS_FTRACE
Steven Rostedta2546fa2011-02-09 13:15:59 -0500750ifdef CONFIG_HAVE_FENTRY
751CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
752endif
Heiko Carstensc0a80c02015-01-09 13:06:33 +0100753KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
Steven Rostedta2546fa2011-02-09 13:15:59 -0500754KBUILD_AFLAGS += $(CC_USING_FENTRY)
Steven Rostedt72441cb2010-10-13 17:12:30 -0400755ifdef CONFIG_DYNAMIC_FTRACE
Steven Rostedtcf4db252010-10-14 23:32:44 -0400756 ifdef CONFIG_HAVE_C_RECORDMCOUNT
Steven Rostedt72441cb2010-10-13 17:12:30 -0400757 BUILD_C_RECORDMCOUNT := y
758 export BUILD_C_RECORDMCOUNT
759 endif
760endif
Arnaldo Carvalho de Melo16444a82008-05-12 21:20:42 +0200761endif
762
Sam Ravnborg91341d42008-01-21 21:31:44 +0100763# We trigger additional mismatches with less inlining
764ifdef CONFIG_DEBUG_SECTION_MISMATCH
765KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
766endif
767
Sam Ravnborge8e69932005-04-30 16:51:42 -0700768# arch Makefile may override CC so keep this after arch Makefile is included
Rik van Riele8f5bdb02005-05-16 21:53:46 -0700769NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
Sam Ravnborge8e69932005-04-30 16:51:42 -0700770CHECKFLAGS += $(NOSTDINC_FLAGS)
771
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772# warn about C99 declaration after statement
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200773KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200775# disable pointer signed / unsigned warnings in gcc 4.0
Michal Marek8417da6f2011-05-02 12:51:15 +0200776KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777
Kirill Smelkovfe8d0a42009-04-09 15:34:34 +0400778# disable invalid "can't wrap" optimizations for signed / pointers
Linus Torvaldsa1378022009-07-12 11:25:04 -0700779KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
Linus Torvaldsd0115552009-03-19 15:53:19 -0700780
Andi Kleen8f7f5c92009-09-18 12:49:37 -0700781# conserve stack if available
782KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
783
Sergei Trofimovich80970472013-09-13 14:51:40 -0700784# disallow errors like 'EXPORT_GPL(foo);' with missing header
785KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
786
787# require functions to have arguments in prototypes, not empty 'int foo()'
788KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
789
Josh Triplettfe7c36c2013-12-23 13:56:06 -0800790# Prohibit date/time macros, which would make the build non-deterministic
791KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
792
Daniel Wagnerea8daa72016-03-08 09:29:09 +0100793# enforce correct pointer usage
794KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
795
Michal Marek40df7592011-04-20 13:45:30 +0200796# use the deterministic mode of AR if available
797KBUILD_ARFLAGS := $(call ar-option,D)
798
Jason Baronbf5438fc2010-09-17 11:09:00 -0400799# check for 'asm goto'
800ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
801 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
Anton Blanchardc0ccf6f2015-04-09 13:51:31 +1000802 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
Jason Baronbf5438fc2010-09-17 11:09:00 -0400803endif
804
Masahiro Yamadaa436bb72015-03-27 20:43:36 +0900805include scripts/Makefile.kasan
806include scripts/Makefile.extrawarn
Andrey Ryabininc6d30852016-01-20 15:00:55 -0800807include scripts/Makefile.ubsan
Masahiro Yamadaa86fe352014-04-14 18:27:10 +0900808
Michal Marek61754c12015-07-01 17:19:30 +0200809# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
810# last assignments
811KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
812KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
813KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
Sam Ravnborg52bcc332007-10-15 22:03:58 +0200814
Roland McGrath18991192007-07-19 01:48:40 -0700815# Use --build-id when available.
816LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
Sam Ravnborgf86fd302009-09-19 10:14:33 +0200817 $(call cc-ldoption, -Wl$(comma)--build-id,))
Sam Ravnborg65881692010-07-28 17:33:09 +0200818KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
Roland McGrath18991192007-07-19 01:48:40 -0700819LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
820
David Howells5d7d18f2009-03-04 11:59:07 -0800821ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
Andi Kleend79a2712009-09-16 22:36:55 +0200822LDFLAGS_vmlinux += $(call ld-option, -X,)
David Howells5d7d18f2009-03-04 11:59:07 -0800823endif
824
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825# Default kernel image to build when no specific target is given.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200826# KBUILD_IMAGE may be overruled on the command line or
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827# set in the environment
828# Also any assignments in arch/$(ARCH)/Makefile take precedence over
829# this default value
830export KBUILD_IMAGE ?= vmlinux
831
832#
833# INSTALL_PATH specifies where to place the updated kernel and system map
834# images. Default is /boot, but you can set it to other values
835export INSTALL_PATH ?= /boot
836
837#
Jason Cooperf4d4ffc2013-12-01 23:56:28 +0000838# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
839# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
840# an argument if needed. Otherwise it defaults to the kernel install path
841#
842export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
843
844#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
846# relocations required by build roots. This is not defined in the
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200847# makefile but the argument can be passed to make if needed.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848#
849
Sam Ravnborgdf9df032006-01-16 12:46:07 +0100850MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851export MODLIB
852
Theodore Ts'oac031f22006-06-21 20:53:09 -0400853#
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +0900854# INSTALL_MOD_STRIP, if defined, will cause modules to be
855# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
856# the default option --strip-debug will be used. Otherwise,
857# INSTALL_MOD_STRIP value will be used as the options to the strip command.
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100858
Theodore Ts'oac031f22006-06-21 20:53:09 -0400859ifdef INSTALL_MOD_STRIP
860ifeq ($(INSTALL_MOD_STRIP),1)
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100861mod_strip_cmd = $(STRIP) --strip-debug
Theodore Ts'oac031f22006-06-21 20:53:09 -0400862else
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100863mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
Theodore Ts'oac031f22006-06-21 20:53:09 -0400864endif # INSTALL_MOD_STRIP=1
865else
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100866mod_strip_cmd = true
Theodore Ts'oac031f22006-06-21 20:53:09 -0400867endif # INSTALL_MOD_STRIP
868export mod_strip_cmd
869
Bertrand Jacquinbeb50df2014-08-27 20:31:56 +0930870# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
871# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
872# or CONFIG_MODULE_COMPRESS_XZ.
873
874mod_compress_cmd = true
875ifdef CONFIG_MODULE_COMPRESS
876 ifdef CONFIG_MODULE_COMPRESS_GZIP
Jason A. Donenfeld3d1450d2015-07-07 20:26:07 +0200877 mod_compress_cmd = gzip -n -f
Bertrand Jacquinbeb50df2014-08-27 20:31:56 +0930878 endif # CONFIG_MODULE_COMPRESS_GZIP
879 ifdef CONFIG_MODULE_COMPRESS_XZ
Jason A. Donenfeld3d1450d2015-07-07 20:26:07 +0200880 mod_compress_cmd = xz -f
Bertrand Jacquinbeb50df2014-08-27 20:31:56 +0930881 endif # CONFIG_MODULE_COMPRESS_XZ
882endif # CONFIG_MODULE_COMPRESS
883export mod_compress_cmd
884
P J P1bf49dd2013-11-12 15:11:44 -0800885# Select initial ramdisk compression format, default is gzip(1).
886# This shall be used by the dracut(8) tool while creating an initramfs image.
887#
Jan Beulich7ac18152013-12-18 17:08:57 -0800888INITRD_COMPRESS-y := gzip
889INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
890INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
891INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
892INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
893INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
Linus Torvaldsb7000ad2013-12-20 16:52:45 -0800894# do not export INITRD_COMPRESS, since we didn't actually
895# choose a sane default compression above.
896# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897
Michal Marekd9d8d7e2013-01-25 13:41:31 +1030898ifdef CONFIG_MODULE_SIG_ALL
David Woodhouse3ee550f2015-08-14 16:17:16 +0100899$(eval $(call config_filename,MODULE_SIG_KEY))
900
901mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
Rusty Russelle2a666d2012-10-19 11:53:15 +1030902else
903mod_sign_cmd = true
904endif
905export mod_sign_cmd
906
907
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908ifeq ($(KBUILD_EXTMOD),)
David Howellscfc411e2015-08-14 15:20:41 +0100909core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910
911vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
912 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
Feng Wu37d9fe42015-09-22 16:47:29 +0800913 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914
915vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
Feng Wu37d9fe42015-09-22 16:47:29 +0800916 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917
918init-y := $(patsubst %/, %/built-in.o, $(init-y))
919core-y := $(patsubst %/, %/built-in.o, $(core-y))
920drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
921net-y := $(patsubst %/, %/built-in.o, $(net-y))
922libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
923libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
924libs-y := $(libs-y1) $(libs-y2)
Feng Wu37d9fe42015-09-22 16:47:29 +0800925virt-y := $(patsubst %/, %/built-in.o, $(virt-y))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200927# Externally visible symbols (used by link-vmlinux.sh)
Sam Ravnborg95698572012-05-05 10:18:40 +0200928export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
Feng Wu37d9fe42015-09-22 16:47:29 +0800929export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
Sam Ravnborg95698572012-05-05 10:18:40 +0200930export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200931export LDFLAGS_vmlinux
Michal Marek6615d6c2013-04-12 14:12:50 +0200932# used by scripts/pacmage/Makefile
Feng Wu37d9fe42015-09-22 16:47:29 +0800933export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200935vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936
Nicolas Pitre2441e782016-04-22 15:25:00 -0400937# Include targets which we want to execute sequentially if the rest of the
938# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
939# evaluated more than once.
940PHONY += vmlinux_prereq
941vmlinux_prereq: $(vmlinux-deps) FORCE
David Woodhouse0f836e5f2006-10-11 01:21:43 -0700942ifdef CONFIG_HEADERS_CHECK
David Woodhouse0e7af8d042006-10-13 16:04:23 +0100943 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
David Woodhouse0f836e5f2006-10-11 01:21:43 -0700944endif
Randy Dunlap3794f3e2008-08-12 15:09:06 -0700945ifdef CONFIG_BUILD_DOCSRC
946 $(Q)$(MAKE) $(build)=Documentation
947endif
Jan Kiszka3ee7b3f2015-02-17 13:46:36 -0800948ifdef CONFIG_GDB_SCRIPTS
949 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
950endif
Nicolas Pitre2441e782016-04-22 15:25:00 -0400951ifdef CONFIG_TRIM_UNUSED_KSYMS
Nicolas Ferreba79d402016-04-25 17:55:08 +0200952 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
Nicolas Pitre2441e782016-04-22 15:25:00 -0400953 "$(MAKE) KBUILD_MODULES=1 -f $(srctree)/Makefile vmlinux_prereq"
954endif
Nicolas Pitre23121ca2016-01-26 21:50:18 -0500955
956# standalone target for easier testing
957include/generated/autoksyms.h: FORCE
Nicolas Ferreba79d402016-04-25 17:55:08 +0200958 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
Nicolas Pitre23121ca2016-01-26 21:50:18 -0500959
Nicolas Pitre2441e782016-04-22 15:25:00 -0400960# Final link of vmlinux
961 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
962quiet_cmd_link-vmlinux = LINK $@
963
Nicolas Pitreedf69472016-04-26 16:48:44 -0400964vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
Nicolas Pitre2441e782016-04-22 15:25:00 -0400965 +$(call if_changed,link-vmlinux)
966
Nicolas Pitredd924782016-02-28 22:00:00 -0500967# Build samples along the rest of the kernel
968ifdef CONFIG_SAMPLES
969vmlinux-dirs += samples
970endif
971
Masahiro Yamada38385f82014-04-28 16:26:18 +0900972# The actual objects are generated when descending,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973# make sure no implicit rule kicks in
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200974$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975
976# Handle descending into subdirectories listed in $(vmlinux-dirs)
977# Preset locale variables to speed up the build process. Limit locale
978# tweaks to this spot to avoid wrong language settings when running
979# make menuconfig etc.
980# Error messages still appears in the original language
981
Paul Smith4f193362006-03-05 17:14:10 -0500982PHONY += $(vmlinux-dirs)
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200983$(vmlinux-dirs): prepare scripts
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 $(Q)$(MAKE) $(build)=$@
985
Michal Marek0d0e7712013-07-11 15:34:51 +0200986define filechk_kernel.release
987 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
988endef
989
Geert Uytterhoeven83a35e32013-06-28 11:27:31 +0200990# Store (new) KERNELRELEASE string in include/config/kernel.release
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700991include/config/kernel.release: include/config/auto.conf FORCE
Michal Marek0d0e7712013-07-11 15:34:51 +0200992 $(call filechk,kernel.release)
Sam Ravnborgcb584552006-01-09 21:20:34 +0100993
994
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995# Things we need to do before we recursively start building the kernel
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200996# or the modules are listed in "prepare".
997# A multi level approach is used. prepareN is processed before prepareN-1.
998# archprepare is used in arch Makefiles and when processed asm symlink,
999# version.h and scripts_basic is processed / created.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001001# Listed in dependency order
Paul Smith4f193362006-03-05 17:14:10 -05001002PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001003
Sam Ravnborg86feeaa2005-09-09 19:28:28 +02001004# prepare3 is used to check if we are building in a separate output directory,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005# and if so do:
1006# 1) Check that make has not been executed in the kernel src $(srctree)
Roman Zippelf1d28fb2006-06-08 22:12:43 -07001007prepare3: include/config/kernel.release
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008ifneq ($(KBUILD_SRC),)
Mike Frysingerfd54f502008-11-06 03:31:35 -05001009 @$(kecho) ' Using $(srctree) as source for kernel'
Roman Zippelc955cca2006-06-08 22:12:39 -07001010 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
Michal Marek5369f552012-07-07 23:04:40 +02001011 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1012 echo >&2 " in the '$(srctree)' directory.";\
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013 /bin/false; \
1014 fi;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015endif
1016
Sam Ravnborg86feeaa2005-09-09 19:28:28 +02001017# prepare2 creates a makefile if using a separate output directory
Sam Ravnborgd8ecc5c2011-04-27 22:29:49 +02001018prepare2: prepare3 outputmakefile asm-generic
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019
David Howellsd183e6f2012-10-02 18:01:56 +01001020prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
Sam Ravnborgf7f16b72009-10-18 00:00:43 +02001021 include/config/auto.conf
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001022 $(cmd_crmodverdir)
Nicolas Pitref2355412016-01-22 01:32:26 -05001023 $(Q)test -e include/generated/autoksyms.h || \
1024 touch include/generated/autoksyms.h
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025
H. Peter Anvin6520fe52012-05-08 21:22:24 +03001026archprepare: archheaders archscripts prepare1 scripts_basic
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001027
Masahiro Yamada2e8d6962016-03-13 09:13:55 +09001028prepare0: archprepare
Sam Ravnborg8d36a622005-09-10 21:05:36 +02001029 $(Q)$(MAKE) $(build)=.
Sam Ravnborg86feeaa2005-09-09 19:28:28 +02001030
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031# All the preparing..
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -06001032prepare: prepare0 prepare-objtool
1033
Josh Poimboeuf3b27a0c2016-03-03 11:39:30 -06001034ifdef CONFIG_STACK_VALIDATION
1035 has_libelf := $(shell echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf - &> /dev/null && echo 1 || echo 0)
1036 ifeq ($(has_libelf),1)
1037 objtool_target := tools/objtool FORCE
1038 else
1039 $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev or elfutils-libelf-devel")
1040 SKIP_STACK_VALIDATION := 1
1041 export SKIP_STACK_VALIDATION
1042 endif
1043endif
1044
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -06001045PHONY += prepare-objtool
Josh Poimboeuf3b27a0c2016-03-03 11:39:30 -06001046prepare-objtool: $(objtool_target)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048# Generate some files
1049# ---------------------------------------------------------------------------
1050
1051# KERNELRELEASE can change from a few different places, meaning version.h
1052# needs to be updated, so this check is forced on all builds
1053
1054uts_len := 64
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001055define filechk_utsrelease.h
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001057 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1058 exit 1; \
1059 fi; \
1060 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061endef
1062
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001063define filechk_version.h
Jesper Juhl450c6072012-02-16 22:49:15 +01001064 (echo \#define LINUX_VERSION_CODE $(shell \
1065 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001066 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1067endef
1068
David Howellsd183e6f2012-10-02 18:01:56 +01001069$(version_h): $(srctree)/Makefile FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070 $(call filechk,version.h)
Michal Marek223c24a2014-11-27 16:13:17 +01001071 $(Q)rm -f $(old_version_h)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072
Sam Ravnborg273b2812009-10-18 00:52:28 +02001073include/generated/utsrelease.h: include/config/kernel.release FORCE
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001074 $(call filechk,utsrelease.h)
1075
Vegard Nossum179efcb2008-12-16 12:33:43 +01001076PHONY += headerdep
1077headerdep:
Peter Foley9663d982011-04-26 17:17:11 -04001078 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1079 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
Vegard Nossum179efcb2008-12-16 12:33:43 +01001080
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081# ---------------------------------------------------------------------------
David Woodhouse88ecf812008-05-29 11:01:51 +03001082# Firmware install
1083INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1084export INSTALL_FW_PATH
1085
1086PHONY += firmware_install
Masahiro Yamada2e8d6962016-03-13 09:13:55 +09001087firmware_install:
David Woodhouse88ecf812008-05-29 11:01:51 +03001088 @mkdir -p $(objtree)/firmware
1089 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1090
1091# ---------------------------------------------------------------------------
David Woodhouse8d730cf2006-06-18 11:58:39 +01001092# Kernel headers
David Woodhouse8d730cf2006-06-18 11:58:39 +01001093
Sam Ravnborge6883b12008-06-05 16:43:46 +02001094#Default location for installed headers
1095export INSTALL_HDR_PATH = $(objtree)/usr
1096
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001097# If we do an all arch process set dst to asm-$(hdr-arch)
1098hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
Sam Ravnborge6883b12008-06-05 16:43:46 +02001099
H. Peter Anvin052ad272011-11-17 13:17:35 -08001100PHONY += archheaders
1101archheaders:
1102
H. Peter Anvin6520fe52012-05-08 21:22:24 +03001103PHONY += archscripts
1104archscripts:
1105
Sam Ravnborge6883b12008-06-05 16:43:46 +02001106PHONY += __headers
Masahiro Yamada2e8d6962016-03-13 09:13:55 +09001107__headers: $(version_h) scripts_basic asm-generic archheaders archscripts
Mike Waychisone1b702c2011-03-14 23:34:25 -07001108 $(Q)$(MAKE) $(build)=scripts build_unifdef
David Woodhouse6d716272006-09-24 22:16:03 +01001109
1110PHONY += headers_install_all
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001111headers_install_all:
1112 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
David Woodhouse6d716272006-09-24 22:16:03 +01001113
David Woodhouse8d730cf2006-06-18 11:58:39 +01001114PHONY += headers_install
Sam Ravnborge6883b12008-06-05 16:43:46 +02001115headers_install: __headers
David Howells10b63952012-10-02 18:01:57 +01001116 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1117 $(error Headers not exportable for the $(SRCARCH) architecture))
1118 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1119 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
David Woodhouse8d730cf2006-06-18 11:58:39 +01001120
Mike Frysinger1f857122007-02-14 00:33:02 -08001121PHONY += headers_check_all
1122headers_check_all: headers_install_all
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001123 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
Mike Frysinger1f857122007-02-14 00:33:02 -08001124
David Woodhouse68475352006-06-18 12:02:10 +01001125PHONY += headers_check
1126headers_check: headers_install
David Howells10b63952012-10-02 18:01:57 +01001127 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1128 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
David Woodhouse68475352006-06-18 12:02:10 +01001129
David Woodhouse8d730cf2006-06-18 11:58:39 +01001130# ---------------------------------------------------------------------------
Shuah Khan5a5da782014-08-07 13:07:46 -06001131# Kernel selftest
1132
1133PHONY += kselftest
1134kselftest:
1135 $(Q)$(MAKE) -C tools/testing/selftests run_tests
1136
Wang Longdcb825a2015-10-08 02:41:18 +00001137kselftest-clean:
1138 $(Q)$(MAKE) -C tools/testing/selftests clean
1139
Bamvor Jian Zhang3d6dee72016-01-08 15:27:34 +08001140PHONY += kselftest-merge
1141kselftest-merge:
1142 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1143 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1144 -m $(objtree)/.config \
1145 $(srctree)/tools/testing/selftests/*/config
1146 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1147
Shuah Khan5a5da782014-08-07 13:07:46 -06001148# ---------------------------------------------------------------------------
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149# Modules
1150
1151ifdef CONFIG_MODULES
1152
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001153# By default, build modules as well
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154
Michal Marek73d13932010-03-10 12:28:58 +01001155all: modules
Linus Torvalds1da177e2005-04-16 15:20:36 -07001156
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +09001157# Build modules
Tejun Heo551559e2007-12-07 21:04:30 +09001158#
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +09001159# A module can be listed more than once in obj-m resulting in
1160# duplicate lines in modules.order files. Those are removed
1161# using awk while concatenating to the final file.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162
Paul Smith4f193362006-03-05 17:14:10 -05001163PHONY += modules
Michal Marek2da30e72010-06-07 22:22:12 +02001164modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
Tejun Heo551559e2007-12-07 21:04:30 +09001165 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
Mike Frysingerfd54f502008-11-06 03:31:35 -05001166 @$(kecho) ' Building modules, stage 2.';
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001167 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
David Woodhouse44463f72008-07-25 14:17:19 -04001168 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169
Michal Mareka6c36632010-03-08 10:07:12 +01001170modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1171 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1172
Michal Marek73d13932010-03-10 12:28:58 +01001173%/modules.builtin: include/config/auto.conf
Michal Mareka6c36632010-03-08 10:07:12 +01001174 $(Q)$(MAKE) $(modbuiltin)=$*
1175
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176
1177# Target to prepare building external modules
Paul Smith4f193362006-03-05 17:14:10 -05001178PHONY += modules_prepare
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001179modules_prepare: prepare scripts
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180
1181# Target to install modules
Paul Smith4f193362006-03-05 17:14:10 -05001182PHONY += modules_install
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183modules_install: _modinst_ _modinst_post
1184
Paul Smith4f193362006-03-05 17:14:10 -05001185PHONY += _modinst_
Michal Marek2da30e72010-06-07 22:22:12 +02001186_modinst_:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187 @rm -rf $(MODLIB)/kernel
1188 @rm -f $(MODLIB)/source
1189 @mkdir -p $(MODLIB)/kernel
Michal Marek890676c2014-04-25 17:36:14 +02001190 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1192 rm -f $(MODLIB)/build ; \
Michal Marek7e1c0472014-04-25 17:29:45 +02001193 ln -s $(CURDIR) $(MODLIB)/build ; \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194 fi
Tejun Heo551559e2007-12-07 21:04:30 +09001195 @cp -f $(objtree)/modules.order $(MODLIB)/
Michal Marekbc081dd2009-12-07 16:38:33 +01001196 @cp -f $(objtree)/modules.builtin $(MODLIB)/
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001197 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001199# This depmod is only for convenience to give the initial
Linus Torvalds1da177e2005-04-16 15:20:36 -07001200# boot a modules.dep even before / is mounted read-write. However the
1201# boot script depmod is the master version.
Paul Smith4f193362006-03-05 17:14:10 -05001202PHONY += _modinst_post
Linus Torvalds6d128e12013-07-10 19:02:51 -07001203_modinst_post: _modinst_
David Woodhouse88ecf812008-05-29 11:01:51 +03001204 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001205 $(call cmd,depmod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206
Josh Boyerd890f512012-11-05 09:09:24 +10301207ifeq ($(CONFIG_MODULE_SIG), y)
1208PHONY += modules_sign
1209modules_sign:
1210 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1211endif
1212
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213else # CONFIG_MODULES
1214
1215# Modules not configured
1216# ---------------------------------------------------------------------------
1217
Masahiro Yamada612e47c2016-03-13 09:39:22 +09001218PHONY += modules modules_install
1219modules modules_install:
Michal Marek5369f552012-07-07 23:04:40 +02001220 @echo >&2
1221 @echo >&2 "The present kernel configuration has modules disabled."
1222 @echo >&2 "Type 'make config' and enable loadable module support."
1223 @echo >&2 "Then build a kernel with module support enabled."
1224 @echo >&2
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225 @exit 1
1226
1227endif # CONFIG_MODULES
1228
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229###
1230# Cleaning is done on three levels.
1231# make clean Delete most generated files
1232# Leave enough to build external modules
1233# make mrproper Delete the current configuration, and all generated files
1234# make distclean Remove editor backup files, patch leftover files and the like
1235
1236# Directories & files removed with 'make clean'
1237CLEAN_DIRS += $(MODVERDIR)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238
1239# Directories & files removed with 'make mrproper'
Sam Ravnborgd8ecc5c2011-04-27 22:29:49 +02001240MRPROPER_DIRS += include/config usr/include include/generated \
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +09001241 arch/*/include/generated .tmp_objdiff
Masahiro Yamadac22bd32c2015-01-08 17:29:38 +09001242MRPROPER_FILES += .config .config.old .version .old_version \
Rusty Russelld5b71932012-10-02 14:35:24 +09301243 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
David Woodhousefb117942015-07-20 21:16:30 +01001244 signing_key.pem signing_key.priv signing_key.x509 \
1245 x509.genkey extra_certificates signing_key.x509.keyid \
Jan Kiszka3ee7b3f2015-02-17 13:46:36 -08001246 signing_key.x509.signer vmlinux-gdb.py
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247
1248# clean - Delete most, but leave enough to build external modules
1249#
1250clean: rm-dirs := $(CLEAN_DIRS)
1251clean: rm-files := $(CLEAN_FILES)
Gerard Snitselaarfb68d4b2012-02-04 02:55:59 -07001252clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253
Pawel Mollbd1ee802012-10-29 11:23:02 +00001254PHONY += $(clean-dirs) clean archclean vmlinuxclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255$(clean-dirs):
1256 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1257
Pawel Mollbd1ee802012-10-29 11:23:02 +00001258vmlinuxclean:
1259 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1260
1261clean: archclean vmlinuxclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262
1263# mrproper - Delete all generated files, including .config
1264#
1265mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1266mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1267mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1268
Paul Smith4f193362006-03-05 17:14:10 -05001269PHONY += $(mrproper-dirs) mrproper archmrproper
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270$(mrproper-dirs):
1271 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1272
1273mrproper: clean archmrproper $(mrproper-dirs)
1274 $(call cmd,rmdirs)
1275 $(call cmd,rmfiles)
1276
1277# distclean
1278#
Paul Smith4f193362006-03-05 17:14:10 -05001279PHONY += distclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001280
1281distclean: mrproper
1282 @find $(srctree) $(RCS_FIND_IGNORE) \
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001283 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
Masahiro Yamadaa03fcb502014-03-28 16:36:12 +09001285 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286 -type f -print | xargs rm -f
1287
1288
1289# Packaging of the kernel to various formats
1290# ---------------------------------------------------------------------------
1291# rpm target kept for backward compatibility
Michal Marekc79624c2014-07-04 22:53:52 +02001292package-dir := scripts/package
Linus Torvalds1da177e2005-04-16 15:20:36 -07001293
Arnaldo Carvalho de Melobafb6742010-06-07 07:44:25 -03001294%src-pkg: FORCE
1295 $(Q)$(MAKE) $(build)=$(package-dir) $@
Zach Brown031ecc62006-06-08 22:12:37 -07001296%pkg: include/config/kernel.release FORCE
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001297 $(Q)$(MAKE) $(build)=$(package-dir) $@
Zach Brown031ecc62006-06-08 22:12:37 -07001298rpm: include/config/kernel.release FORCE
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001299 $(Q)$(MAKE) $(build)=$(package-dir) $@
Linus Torvalds1da177e2005-04-16 15:20:36 -07001300
1301
1302# Brief documentation of the typical targets used
1303# ---------------------------------------------------------------------------
1304
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001305boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
Konstantin Khlebnikova1e7b7b2014-10-28 17:18:20 +04001306boards := $(sort $(notdir $(boards)))
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001307board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1308board-dirs := $(sort $(notdir $(board-dirs:/=)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309
Masahiro Yamadafe69b422016-03-13 09:39:55 +09001310PHONY += help
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311help:
1312 @echo 'Cleaning targets:'
Samuel Tardieu5ea084e2006-12-12 19:09:40 +01001313 @echo ' clean - Remove most generated files but keep the config and'
Jesper Juhl5cc8d242006-09-24 14:01:08 +02001314 @echo ' enough build support to build external modules'
Samuel Tardieu5ea084e2006-12-12 19:09:40 +01001315 @echo ' mrproper - Remove all generated files + config + various backup files'
Jesper Juhl5cc8d242006-09-24 14:01:08 +02001316 @echo ' distclean - mrproper + remove editor backup and patch files'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001317 @echo ''
1318 @echo 'Configuration targets:'
1319 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1320 @echo ''
1321 @echo 'Other generic targets:'
1322 @echo ' all - Build all targets marked with [*]'
1323 @echo '* vmlinux - Build the bare kernel'
1324 @echo '* modules - Build all modules'
Bodo Eggert9cc5d742005-11-23 20:11:34 +01001325 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
David Woodhouse88ecf812008-05-29 11:01:51 +03001326 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1327 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001328 @echo ' dir/ - Build all files in dir and below'
Wang YanQing40ab87a2015-12-11 00:35:19 +08001329 @echo ' dir/file.[ois] - Build specified target only'
Joe Perches62718972010-01-13 09:31:44 -08001330 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1331 @echo ' (requires a recent binutils and recent build (System.map))'
Sam Ravnborg155ad602005-07-07 17:56:08 -07001332 @echo ' dir/file.ko - Build module including final link'
Robert P. J. Dayc4d5ee62009-04-24 12:35:23 -04001333 @echo ' modules_prepare - Set up for building external modules'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334 @echo ' tags/TAGS - Generate tags file for editors'
1335 @echo ' cscope - Generate cscope index'
Jianbin Kangf4ed1002011-01-14 20:07:05 +08001336 @echo ' gtags - Generate GNU GLOBAL index'
Michal Marek3f1d9a62014-07-11 15:57:24 +02001337 @echo ' kernelrelease - Output the release version string (use with make -s)'
1338 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1339 @echo ' image_name - Output the image name (use with make -s)'
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001340 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
Geert Uytterhoeven59df3232007-01-29 13:47:01 +01001341 echo ' (default: $(INSTALL_HDR_PATH))'; \
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001342 echo ''
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343 @echo 'Static analysers'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344 @echo ' checkstack - Generate a list of stack hogs'
1345 @echo ' namespacecheck - Name space analysis on compiled kernel'
Sam Ravnborgaa025e72007-11-14 21:34:55 +01001346 @echo ' versioncheck - Sanity check on version.h usage'
Randy Dunlapec2d9872007-11-04 12:01:55 -08001347 @echo ' includecheck - Check for duplicate included header files'
Adrian Bunk295ac052007-08-24 23:04:56 +02001348 @echo ' export_report - List the usages of all exported symbols'
Vegard Nossum179efcb2008-12-16 12:33:43 +01001349 @echo ' headers_check - Sanity check on exported headers'
Nicolas Palix74425ee2010-06-06 17:15:01 +02001350 @echo ' headerdep - Detect inclusion cycles in headers'
1351 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1352 @echo ''
Shuah Khan5a5da782014-08-07 13:07:46 -06001353 @echo 'Kernel selftest'
1354 @echo ' kselftest - Build and run kernel selftest (run as root)'
1355 @echo ' Build, install, and boot kernel before'
1356 @echo ' running kselftest on it'
Wang Longdcb825a2015-10-08 02:41:18 +00001357 @echo ' kselftest-clean - Remove all generated kselftest files'
Bamvor Jian Zhang3d6dee72016-01-08 15:27:34 +08001358 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existed'
1359 @echo ' .config.'
Shuah Khan5a5da782014-08-07 13:07:46 -06001360 @echo ''
Linus Torvalds1da177e2005-04-16 15:20:36 -07001361 @echo 'Kernel packaging:'
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001362 @$(MAKE) $(build)=$(package-dir) help
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363 @echo ''
1364 @echo 'Documentation targets:'
1365 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1366 @echo ''
Andres Salomon01dee182008-04-25 22:34:58 -04001367 @echo 'Architecture specific targets ($(SRCARCH)):'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368 @$(if $(archhelp),$(archhelp),\
Andres Salomon01dee182008-04-25 22:34:58 -04001369 echo ' No architecture specific help defined for $(SRCARCH)')
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370 @echo ''
1371 @$(if $(boards), \
1372 $(foreach b, $(boards), \
1373 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1374 echo '')
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001375 @$(if $(board-dirs), \
1376 $(foreach b, $(board-dirs), \
1377 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1378 printf " %-16s - Show all of the above\\n" help-boards; \
1379 echo '')
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380
1381 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
Sam Ravnborg45d506b2006-08-08 21:35:14 +02001382 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001383 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
Dustin Kirkland701842e2006-05-23 15:57:23 -05001384 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1385 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
Ingo Molnaraf07ce32011-06-16 13:26:23 +02001386 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
Sam Ravnborg28bc20d2011-04-27 22:15:27 +02001387 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1388 @echo ' 1: warnings which may be relevant and do not occur too often'
1389 @echo ' 2: warnings which occur quite often but may still be relevant'
1390 @echo ' 3: more obscure warnings, can most likely be ignored'
Michal Mareka6de5532011-04-29 14:45:31 +02001391 @echo ' Multiple levels can be combined with W=12 or W=123'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001392 @echo ''
1393 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1394 @echo 'For further info see the ./README file'
1395
1396
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001397help-board-dirs := $(addprefix help-,$(board-dirs))
1398
1399help-boards: $(help-board-dirs)
1400
Michal Marekfbae4d52014-11-28 13:31:43 +01001401boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001402
1403$(help-board-dirs): help-%:
1404 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1405 @$(if $(boards-per-dir), \
1406 $(foreach b, $(boards-per-dir), \
1407 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1408 echo '')
1409
1410
Linus Torvalds1da177e2005-04-16 15:20:36 -07001411# Documentation targets
1412# ---------------------------------------------------------------------------
1413%docs: scripts_basic FORCE
Ben Hutchingsb479bfd2015-09-28 01:09:52 +01001414 $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
Linus Torvalds1da177e2005-04-16 15:20:36 -07001415 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1416
1417else # KBUILD_EXTMOD
1418
1419###
1420# External module support.
1421# When building external modules the kernel used as basis is considered
1422# read-only, and no consistency checks are made and the make
1423# system is not used on the basis kernel. If updates are required
1424# in the basis kernel ordinary make commands (without M=...) must
1425# be used.
1426#
1427# The following are the only valid targets when building external
1428# modules.
1429# make M=dir clean Delete all automatically generated files
1430# make M=dir modules Make all modules in specified dir
1431# make M=dir Same as 'make M=dir modules'
1432# make M=dir modules_install
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001433# Install the modules built in the module directory
Linus Torvalds1da177e2005-04-16 15:20:36 -07001434# Assumes install directory is already created
1435
1436# We are always building modules
1437KBUILD_MODULES := 1
Paul Smith4f193362006-03-05 17:14:10 -05001438PHONY += crmodverdir
Linus Torvalds1da177e2005-04-16 15:20:36 -07001439crmodverdir:
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001440 $(cmd_crmodverdir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001441
Paul Smith4f193362006-03-05 17:14:10 -05001442PHONY += $(objtree)/Module.symvers
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443$(objtree)/Module.symvers:
1444 @test -e $(objtree)/Module.symvers || ( \
1445 echo; \
1446 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1447 echo " is missing; modules will have no dependencies and modversions."; \
1448 echo )
1449
1450module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
Paul Smith4f193362006-03-05 17:14:10 -05001451PHONY += $(module-dirs) modules
Linus Torvalds1da177e2005-04-16 15:20:36 -07001452$(module-dirs): crmodverdir $(objtree)/Module.symvers
1453 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1454
1455modules: $(module-dirs)
Mike Frysingerfd54f502008-11-06 03:31:35 -05001456 @$(kecho) ' Building modules, stage 2.';
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001457 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
Linus Torvalds1da177e2005-04-16 15:20:36 -07001458
Paul Smith4f193362006-03-05 17:14:10 -05001459PHONY += modules_install
Sam Ravnborga67dc212006-01-28 23:51:57 +01001460modules_install: _emodinst_ _emodinst_post
Adrian Bunke6304662006-02-14 15:58:15 +01001461
Paul Smith4f193362006-03-05 17:14:10 -05001462install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1463PHONY += _emodinst_
Sam Ravnborga67dc212006-01-28 23:51:57 +01001464_emodinst_:
Sam Ravnborga67dc212006-01-28 23:51:57 +01001465 $(Q)mkdir -p $(MODLIB)/$(install-dir)
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001466 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467
Paul Smith4f193362006-03-05 17:14:10 -05001468PHONY += _emodinst_post
Sam Ravnborga67dc212006-01-28 23:51:57 +01001469_emodinst_post: _emodinst_
1470 $(call cmd,depmod)
1471
Linus Torvalds1da177e2005-04-16 15:20:36 -07001472clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1473
Paul Smith4f193362006-03-05 17:14:10 -05001474PHONY += $(clean-dirs) clean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001475$(clean-dirs):
1476 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1477
1478clean: rm-dirs := $(MODVERDIR)
Michal Marek88d7be02010-09-06 12:00:08 +02001479clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480
Masahiro Yamadafe69b422016-03-13 09:39:55 +09001481PHONY += help
Linus Torvalds1da177e2005-04-16 15:20:36 -07001482help:
1483 @echo ' Building external modules.'
1484 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1485 @echo ''
1486 @echo ' modules - default target, build the module(s)'
1487 @echo ' modules_install - install the module'
1488 @echo ' clean - remove generated files in module directory only'
1489 @echo ''
Sam Ravnborg06300b22006-01-25 07:13:18 +01001490
1491# Dummies...
Paul Smith4f193362006-03-05 17:14:10 -05001492PHONY += prepare scripts
Sam Ravnborg06300b22006-01-25 07:13:18 +01001493prepare: ;
1494scripts: ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001495endif # KBUILD_EXTMOD
1496
Michal Marek88d7be02010-09-06 12:00:08 +02001497clean: $(clean-dirs)
1498 $(call cmd,rmdirs)
1499 $(call cmd,rmfiles)
Kevin Cernekee43f67c92011-05-10 15:47:16 -07001500 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
Michal Marek88d7be02010-09-06 12:00:08 +02001501 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
David Howellsaddbcdb2012-09-26 10:09:50 +01001502 -o -name '*.ko.*' \
Andi Kleen866ced92014-07-30 20:50:18 +02001503 -o -name '*.dwo' \
Rasmus Villemoesd523b252015-08-20 11:53:29 +02001504 -o -name '*.su' \
Michal Marek88d7be02010-09-06 12:00:08 +02001505 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1506 -o -name '*.symtypes' -o -name 'modules.order' \
1507 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1508 -o -name '*.gcno' \) -type f -print | xargs rm -f
1509
Linus Torvalds1da177e2005-04-16 15:20:36 -07001510# Generate tags for editors
1511# ---------------------------------------------------------------------------
Sam Ravnborga680eed2008-12-03 22:24:13 +01001512quiet_cmd_tags = GEN $@
1513 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
Linus Torvalds1da177e2005-04-16 15:20:36 -07001514
Jianbin Kangf4ed1002011-01-14 20:07:05 +08001515tags TAGS cscope gtags: FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516 $(call cmd,tags)
1517
Linus Torvalds1da177e2005-04-16 15:20:36 -07001518# Scripts to check various things for consistency
1519# ---------------------------------------------------------------------------
1520
Peter Foley279f3dd2011-04-26 17:15:01 -04001521PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1522
Linus Torvalds1da177e2005-04-16 15:20:36 -07001523includecheck:
Peter Foley436f8762011-04-26 17:18:29 -04001524 find $(srctree)/* $(RCS_FIND_IGNORE) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001525 -name '*.[hcS]' -type f -print | sort \
Geert Uytterhoeven80007432007-11-05 11:51:44 +01001526 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527
1528versioncheck:
Peter Foley2ee2d292011-04-26 17:19:28 -04001529 find $(srctree)/* $(RCS_FIND_IGNORE) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001530 -name '*.[hcS]' -type f -print | sort \
Geert Uytterhoeven80007432007-11-05 11:51:44 +01001531 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532
Nicolas Palix74425ee2010-06-06 17:15:01 +02001533coccicheck:
1534 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1535
Linus Torvalds1da177e2005-04-16 15:20:36 -07001536namespacecheck:
1537 $(PERL) $(srctree)/scripts/namespace.pl
1538
Adrian Bunk295ac052007-08-24 23:04:56 +02001539export_report:
1540 $(PERL) $(srctree)/scripts/export_report.pl
1541
Linus Torvalds1da177e2005-04-16 15:20:36 -07001542endif #ifeq ($(config-targets),1)
1543endif #ifeq ($(mixed-targets),1)
1544
Mike Marciniszync398ff02013-06-24 08:48:37 -04001545PHONY += checkstack kernelrelease kernelversion image_name
Jeff Dikee3ccf6e2006-09-27 01:50:37 -07001546
Jeff Dike011e3a92006-12-13 00:34:12 -08001547# UML needs a little special treatment here. It wants to use the host
1548# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1549# else wants $(ARCH), including people doing cross-builds, which means
1550# that $(SUBARCH) doesn't work here.
1551ifeq ($(ARCH), um)
1552CHECKSTACK_ARCH := $(SUBARCH)
1553else
1554CHECKSTACK_ARCH := $(ARCH)
1555endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001556checkstack:
1557 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
Jeff Dike011e3a92006-12-13 00:34:12 -08001558 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001559
Amerigo Wang7b8ea532010-08-20 05:36:06 -04001560kernelrelease:
1561 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
Amerigo Wang01ab1782010-06-28 10:45:21 +08001562
Sam Ravnborgcb584552006-01-09 21:20:34 +01001563kernelversion:
Sam Ravnborg2244cbd2006-01-16 12:12:12 +01001564 @echo $(KERNELVERSION)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565
Mike Marciniszync398ff02013-06-24 08:48:37 -04001566image_name:
1567 @echo $(KBUILD_IMAGE)
1568
Borislav Petkovea01fa92012-04-11 18:36:18 +02001569# Clear a bunch of variables before executing the submake
1570tools/: FORCE
David Howellsbf351822012-11-05 21:02:08 +00001571 $(Q)mkdir -p $(objtree)/tools
Josh Poimboeufe17cf3a2016-03-03 08:53:43 -06001572 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
Borislav Petkovea01fa92012-04-11 18:36:18 +02001573
1574tools/%: FORCE
David Howellsbf351822012-11-05 21:02:08 +00001575 $(Q)mkdir -p $(objtree)/tools
Josh Poimboeufe17cf3a2016-03-03 08:53:43 -06001576 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
Borislav Petkovea01fa92012-04-11 18:36:18 +02001577
Sam Ravnborg06300b22006-01-25 07:13:18 +01001578# Single targets
1579# ---------------------------------------------------------------------------
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001580# Single targets are compatible with:
Robert P. J. Daye1b85132008-02-03 15:14:02 +02001581# - build with mixed source and output
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001582# - build with separate output dir 'make O=...'
1583# - external modules
1584#
1585# target-dir => where to store outputfile
1586# build-dir => directory in kernel source tree to use
Sam Ravnborg06300b22006-01-25 07:13:18 +01001587
Sam Ravnborg06300b22006-01-25 07:13:18 +01001588ifeq ($(KBUILD_EXTMOD),)
Sam Ravnborgaa360872006-04-06 08:25:31 +02001589 build-dir = $(patsubst %/,%,$(dir $@))
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001590 target-dir = $(dir $@)
Sam Ravnborg06300b22006-01-25 07:13:18 +01001591else
1592 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001593 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1594 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
Sam Ravnborg06300b22006-01-25 07:13:18 +01001595endif
1596
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001597%.s: %.c prepare scripts FORCE
1598 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1599%.i: %.c prepare scripts FORCE
1600 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1601%.o: %.c prepare scripts FORCE
1602 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1603%.lst: %.c prepare scripts FORCE
1604 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1605%.s: %.S prepare scripts FORCE
1606 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1607%.o: %.S prepare scripts FORCE
1608 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
Andreas Gruenbacher15fde672006-05-09 20:37:30 +02001609%.symtypes: %.c prepare scripts FORCE
1610 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001611
1612# Modules
Sam Ravnborg31110eb2008-12-13 23:00:45 +01001613/: prepare scripts FORCE
1614 $(cmd_crmodverdir)
1615 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1616 $(build)=$(build-dir)
Peter Foley8e2faea2014-09-25 11:23:58 -07001617# Make sure the latest headers are built for Documentation
1618Documentation/: headers_install
Sam Ravnborg31110eb2008-12-13 23:00:45 +01001619%/: prepare scripts FORCE
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001620 $(cmd_crmodverdir)
Sam Ravnborg06300b22006-01-25 07:13:18 +01001621 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001622 $(build)=$(build-dir)
1623%.ko: prepare scripts FORCE
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001624 $(cmd_crmodverdir)
Sam Ravnborg06300b22006-01-25 07:13:18 +01001625 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001626 $(build)=$(build-dir) $(@:.ko=.o)
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001627 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
Sam Ravnborg06300b22006-01-25 07:13:18 +01001628
Masahiro Yamada38385f82014-04-28 16:26:18 +09001629# FIXME Should go into a make.lib or something
Linus Torvalds1da177e2005-04-16 15:20:36 -07001630# ===========================================================================
1631
1632quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1633 cmd_rmdirs = rm -rf $(rm-dirs)
1634
1635quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1636 cmd_rmfiles = rm -f $(rm-files)
1637
Uwe Kleine-Königbc3c26f2008-04-21 22:53:56 +00001638# Run depmod only if we have System.map and depmod is executable
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001639quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
Michal Marek569658d2011-06-15 22:15:47 +02001640 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
Rusty Russellb92021b2013-03-15 15:04:17 +10301641 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001642
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001643# Create temporary dir for module support files
Sam Ravnborgab19f872007-10-22 11:23:07 +02001644# clean it up only when building all modules
1645cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1646 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001647
Linus Torvalds1da177e2005-04-16 15:20:36 -07001648# read all saved command lines
1649
1650targets := $(wildcard $(sort $(targets)))
1651cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1652
1653ifneq ($(cmd_files),)
1654 $(cmd_files): ; # Do not try to update included dependency files
1655 include $(cmd_files)
1656endif
1657
Linus Torvalds1da177e2005-04-16 15:20:36 -07001658endif # skip-makefile
1659
Paul Smith4f193362006-03-05 17:14:10 -05001660PHONY += FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001661FORCE:
Paul Smith4f193362006-03-05 17:14:10 -05001662
Paul Smith4f193362006-03-05 17:14:10 -05001663# Declare the contents of the .PHONY variable as phony. We keep that
Kirill Smelkovfe8d0a42009-04-09 15:34:34 +04001664# information in a variable so we can use it in if_changed and friends.
Paul Smith4f193362006-03-05 17:14:10 -05001665.PHONY: $(PHONY)