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Linus Torvaldsc517d832015-02-22 18:21:14 -08001VERSION = 4
Linus Torvalds2bd6bf02017-09-16 15:47:51 -07002PATCHLEVEL = 14
Linus Torvalds55922c92011-05-29 17:43:36 -07003SUBLEVEL = 0
Linus Torvalds0b071942017-10-29 13:58:38 -07004EXTRAVERSION = -rc7
Linus Torvalds566cf872017-01-29 14:25:17 -08005NAME = Fearless Coyote
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
Masahiro Yamada6f0fa582017-05-19 20:42:30 +090087ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
Michal Marek066b7ed2014-07-04 14:29:30 +020088 quiet=silent_
Josh Poimboeufe572d082017-01-18 22:16:55 -060089 tools_silent=s
Michal Marek066b7ed2014-07-04 14:29:30 +020090endif
Michal Marek066b7ed2014-07-04 14:29:30 +020091
92export quiet Q KBUILD_VERBOSE
93
Linus Torvalds1da177e2005-04-16 15:20:36 -070094# kbuild supports saving output files in a separate directory.
95# To locate output files in a separate directory two syntaxes are supported.
96# In both cases the working directory must be the root of the kernel src.
97# 1) O=
98# Use "make O=dir/to/store/output/files/"
Sam Ravnborg070b98b2006-06-25 00:07:55 +020099#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100# 2) Set KBUILD_OUTPUT
101# Set the environment variable KBUILD_OUTPUT to point to the directory
102# where the output files shall be placed.
103# export KBUILD_OUTPUT=dir/to/store/output/files/
104# make
105#
106# The O= assignment takes precedence over the KBUILD_OUTPUT environment
107# variable.
108
Cao jinc4e6fff2017-06-30 10:45:43 +0800109# KBUILD_SRC is not intended to be used by the regular user (for now),
110# it is set on invocation of make with KBUILD_OUTPUT or O= specified.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111ifeq ($(KBUILD_SRC),)
112
113# OK, Make called in directory where kernel src resides
114# Do we want to locate output files in a separate directory?
Cheng Renquanb8b06182009-05-26 16:03:07 +0800115ifeq ("$(origin O)", "command line")
116 KBUILD_OUTPUT := $(O)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117endif
118
119# That's our default target when none is given on the command line
Paul Smith4f193362006-03-05 17:14:10 -0500120PHONY := _all
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121_all:
122
Sam Ravnborg1cacc9a2007-12-06 22:20:11 +0100123# Cancel implicit rules on top Makefile
124$(CURDIR)/Makefile Makefile: ;
125
Robert Jarzmik51193b72016-04-02 21:38:53 +0200126ifneq ($(words $(subst :, ,$(CURDIR))), 1)
127 $(error main directory cannot contain spaces nor colons)
128endif
129
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130ifneq ($(KBUILD_OUTPUT),)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131# check that the output directory actually exists
132saved-output := $(KBUILD_OUTPUT)
Masahiro Yamada028568d2017-10-02 17:07:28 +0900133KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
134 && /bin/pwd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135$(if $(KBUILD_OUTPUT),, \
Masahiro Yamada1c9e70a2014-03-31 16:41:36 +0900136 $(error failed to create output directory "$(saved-output)"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
Milton Miller0b357862007-09-21 18:09:02 -0500138PHONY += $(MAKECMDGOALS) sub-make
139
Sam Ravnborg1cacc9a2007-12-06 22:20:11 +0100140$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
Charles Keepax16f89092012-10-15 13:49:12 +0100141 @:
Milton Miller0b357862007-09-21 18:09:02 -0500142
Cao jinc4e6fff2017-06-30 10:45:43 +0800143# Invoke a second make in the output directory, passing relevant variables
Masahiro Yamada2e8d6962016-03-13 09:13:55 +0900144sub-make:
Masahiro Yamada745a2542014-09-09 20:02:23 +0900145 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
Masahiro Yamadaaa55c8e2014-09-09 20:02:24 +0900146 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
148# Leave processing to above invocation of make
149skip-makefile := 1
150endif # ifneq ($(KBUILD_OUTPUT),)
151endif # ifeq ($(KBUILD_SRC),)
152
153# We process the rest of the Makefile if this is the final invocation of make
154ifeq ($(skip-makefile),)
155
Masahiro Yamada7ff52572014-09-09 20:02:22 +0900156# Do not print "Entering directory ...",
157# but we want to display it when entering to the output directory
158# so that IDEs/editors are able to understand relative filenames.
159MAKEFLAGS += --no-print-directory
160
Masahiro Yamadaaa55c8e2014-09-09 20:02:24 +0900161# Call a source code checker (by default, "sparse") as part of the
162# C compilation.
163#
164# Use 'make C=1' to enable checking of only re-compiled files.
165# Use 'make C=2' to enable checking of *all* source files, regardless
166# of whether they are re-compiled or not.
167#
Cao jin036db112017-03-24 17:03:17 +0800168# See the file "Documentation/dev-tools/sparse.rst" for more details,
169# including where to get the "sparse" utility.
Masahiro Yamadaaa55c8e2014-09-09 20:02:24 +0900170
171ifeq ("$(origin C)", "command line")
172 KBUILD_CHECKSRC = $(C)
173endif
174ifndef KBUILD_CHECKSRC
175 KBUILD_CHECKSRC = 0
176endif
177
178# Use make M=dir to specify directory of external module to build
179# Old syntax make ... SUBDIRS=$PWD is still supported
180# Setting the environment variable KBUILD_EXTMOD take precedence
181ifdef SUBDIRS
182 KBUILD_EXTMOD ?= $(SUBDIRS)
183endif
184
185ifeq ("$(origin M)", "command line")
186 KBUILD_EXTMOD := $(M)
187endif
188
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189# If building an external module we do not care about the all: rule
190# but instead _all depend on modules
Paul Smith4f193362006-03-05 17:14:10 -0500191PHONY += all
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192ifeq ($(KBUILD_EXTMOD),)
193_all: all
194else
195_all: modules
196endif
197
Michal Marek9da07632014-04-25 23:25:18 +0200198ifeq ($(KBUILD_SRC),)
199 # building in the source tree
200 srctree := .
201else
202 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
203 # building in a subdirectory of the source tree
204 srctree := ..
205 else
206 srctree := $(KBUILD_SRC)
207 endif
208endif
Michal Marek7e1c0472014-04-25 17:29:45 +0200209objtree := .
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210src := $(srctree)
211obj := $(objtree)
212
Mattia Dongili0f558c32006-02-19 13:50:37 +0100213VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214
Amerigo Wang11294232009-06-19 03:40:26 -0400215export srctree objtree VPATH
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217# SUBARCH tells the usermode build what the underlying arch is. That is set
218# first, and if a usermode build is happening, the "ARCH=um" on the command
219# line overrides the setting of ARCH below. If a native build is happening,
Masahiro Yamada38385f82014-04-28 16:26:18 +0900220# then ARCH is assigned, getting whatever value it gets normally, and
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221# SUBARCH is subsequently ignored.
222
David Woodhouseffee0de2012-12-20 21:51:55 +0000223SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
224 -e s/sun4u/sparc64/ \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 -e s/arm.*/arm/ -e s/sa110/arm/ \
Linus Torvalds39990b52005-11-11 14:27:32 -0800226 -e s/s390x/s390/ -e s/parisc64/parisc/ \
Paul Mundt236b1952007-11-02 12:22:47 +0900227 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
Will Deaconf1b99392013-01-18 19:00:47 +0000228 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229
230# Cross compiling and selecting different set of gcc/bin-utils
231# ---------------------------------------------------------------------------
232#
233# When performing cross compilation for other architectures ARCH shall be set
234# to the target architecture. (See arch/* for the possibilities).
235# ARCH can be set during invocation of make:
236# make ARCH=ia64
237# Another way is to have ARCH set in the environment.
238# The default ARCH is the host where make is executed.
239
240# CROSS_COMPILE specify the prefix used for all executables used
241# during compilation. Only gcc and related bin-utils executables
242# are prefixed with $(CROSS_COMPILE).
243# CROSS_COMPILE can be set on the command line
244# make CROSS_COMPILE=ia64-linux-
245# Alternatively CROSS_COMPILE can be set in the environment.
Roland McGrath84336462009-12-21 16:24:06 -0800246# A third alternative is to store a setting in .config so that plain
247# "make" in the configured kernel build directory always uses that.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248# Default value for CROSS_COMPILE is not to prefix executables
249# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
Sam Ravnborg2331d1a2009-10-11 23:22:58 +0200250ARCH ?= $(SUBARCH)
Roland McGrath84336462009-12-21 16:24:06 -0800251CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252
253# Architecture as present in compile.h
Thomas Gleixner6752ed92007-10-11 11:11:36 +0200254UTS_MACHINE := $(ARCH)
255SRCARCH := $(ARCH)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256
Sam Ravnborgd746d642007-11-12 20:14:19 +0100257# Additional ARCH settings for x86
258ifeq ($(ARCH),i386)
259 SRCARCH := x86
260endif
261ifeq ($(ARCH),x86_64)
262 SRCARCH := x86
263endif
Sam Ravnborg74b469f2007-10-25 19:42:04 +0200264
Sam Ravnborg5e538792008-12-02 23:17:12 -0800265# Additional ARCH settings for sparc
Namhyung Kime69f58c2010-10-25 05:48:23 +0000266ifeq ($(ARCH),sparc32)
267 SRCARCH := sparc
268endif
Sam Ravnborga439fe52008-07-27 23:00:59 +0200269ifeq ($(ARCH),sparc64)
Sam Ravnborg5e538792008-12-02 23:17:12 -0800270 SRCARCH := sparc
Sam Ravnborga439fe52008-07-27 23:00:59 +0200271endif
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +0200272
Paul Mundt3cc000b2009-04-11 08:39:27 +0900273# Additional ARCH settings for sh
274ifeq ($(ARCH),sh64)
275 SRCARCH := sh
276endif
277
Chris Metcalf18aecc22011-05-04 14:38:26 -0400278# Additional ARCH settings for tile
Chris Metcalf6738d322011-05-25 15:24:00 -0400279ifeq ($(ARCH),tilepro)
280 SRCARCH := tile
281endif
Chris Metcalf18aecc22011-05-04 14:38:26 -0400282ifeq ($(ARCH),tilegx)
283 SRCARCH := tile
284endif
285
Sam Ravnborg5e538792008-12-02 23:17:12 -0800286# Where to locate arch specific headers
287hdr-arch := $(SRCARCH)
288
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700289KCONFIG_CONFIG ?= .config
Ben Gardiner41263fc2010-12-14 11:39:44 -0500290export KCONFIG_CONFIG
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700291
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292# SHELL used by kbuild
293CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
294 else if [ -x /bin/bash ]; then echo /bin/bash; \
295 else echo sh; fi ; fi)
296
Uwe Kleine-Königd7f14c62017-07-09 20:02:36 +0200297HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS)
298HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS)
299HOST_LFS_LIBS := $(shell getconf LFS_LIBS)
300
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200301HOSTCC = gcc
302HOSTCXX = g++
Uwe Kleine-Königd7f14c62017-07-09 20:02:36 +0200303HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
304 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS)
305HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)
306HOSTLDFLAGS := $(HOST_LFS_LDFLAGS)
307HOST_LOADLIBES := $(HOST_LFS_LIBS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
Behan Webster61163ef2013-09-03 22:27:23 -0400309ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
310HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
311 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
312endif
313
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200314# Decide whether to build built-in, modular, or both.
315# Normally, just do built-in.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316
317KBUILD_MODULES :=
318KBUILD_BUILTIN := 1
319
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +0900320# If we have only "make modules", don't compile built-in objects.
321# When we're building modules with modversions, we need to consider
322# the built-in objects during the descend as well, in order to
323# make sure the checksums are up to date before we record them.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324
325ifeq ($(MAKECMDGOALS),modules)
326 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
327endif
328
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +0900329# If we have "make <whatever> modules", compile modules
330# in addition to whatever we do anyway.
331# Just "make" or "make all" shall build modules as well
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332
333ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
334 KBUILD_MODULES := 1
335endif
336
337ifeq ($(MAKECMDGOALS),)
338 KBUILD_MODULES := 1
339endif
340
Sam Ravnborge579d352005-07-27 08:10:10 +0200341export KBUILD_MODULES KBUILD_BUILTIN
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
343
Sam Ravnborg1cacc9a2007-12-06 22:20:11 +0100344# We need some generic definitions (do not try to remake the file).
Masahiro Yamadaa436bb72015-03-27 20:43:36 +0900345scripts/Kbuild.include: ;
346include scripts/Kbuild.include
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347
348# Make variables (CC, etc...)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349AS = $(CROSS_COMPILE)as
350LD = $(CROSS_COMPILE)ld
351CC = $(CROSS_COMPILE)gcc
352CPP = $(CC) -E
353AR = $(CROSS_COMPILE)ar
354NM = $(CROSS_COMPILE)nm
355STRIP = $(CROSS_COMPILE)strip
356OBJCOPY = $(CROSS_COMPILE)objcopy
357OBJDUMP = $(CROSS_COMPILE)objdump
358AWK = awk
359GENKSYMS = scripts/genksyms/genksyms
Sam Ravnborgcaa27b62009-07-20 21:37:11 +0200360INSTALLKERNEL := installkernel
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361DEPMOD = /sbin/depmod
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362PERL = perl
Masahiro Yamada011bf122014-07-18 13:40:11 +0900363PYTHON = python
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364CHECK = sparse
365
Hannes Eder80a7d1d2008-12-27 22:38:44 +0100366CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
367 -Wbitwise -Wno-return-void $(CF)
Michal Marekb36fad62016-06-07 11:57:02 +0200368NOSTDINC_FLAGS =
Sam Ravnborg65881692010-07-28 17:33:09 +0200369CFLAGS_MODULE =
370AFLAGS_MODULE =
371LDFLAGS_MODULE =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372CFLAGS_KERNEL =
373AFLAGS_KERNEL =
Michal Marekb36fad62016-06-07 11:57:02 +0200374LDFLAGS_vmlinux =
Arnd Bergmannb334e192017-01-13 16:40:01 +0100375CFLAGS_GCOV := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
Emese Revfy543c37c2016-05-24 00:11:37 +0200376CFLAGS_KCOV := $(call cc-option,-fsanitize-coverage=trace-pc,)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377
378
David Howellsabbf1592012-10-02 18:01:26 +0100379# Use USERINCLUDE when you must reference the UAPI directories only.
380USERINCLUDE := \
381 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
Arnd Bergmann3308b282016-06-15 17:45:45 +0200382 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
David Howellsabbf1592012-10-02 18:01:26 +0100383 -I$(srctree)/include/uapi \
Arnd Bergmann3308b282016-06-15 17:45:45 +0200384 -I$(objtree)/include/generated/uapi \
David Howellsabbf1592012-10-02 18:01:26 +0100385 -include $(srctree)/include/linux/kconfig.h
386
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387# Use LINUXINCLUDE when you must reference the include/ directory.
388# Needed to be compatible with the O= option
David Howellsabbf1592012-10-02 18:01:26 +0100389LINUXINCLUDE := \
390 -I$(srctree)/arch/$(hdr-arch)/include \
Arnd Bergmann3308b282016-06-15 17:45:45 +0200391 -I$(objtree)/arch/$(hdr-arch)/include/generated \
David Howellsabbf1592012-10-02 18:01:26 +0100392 $(if $(KBUILD_SRC), -I$(srctree)/include) \
Masahiro Yamadaf8224f72017-06-06 16:15:28 +0900393 -I$(objtree)/include \
394 $(USERINCLUDE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395
Sam Ravnborgd8672b42008-11-21 21:50:02 +0100396KBUILD_CPPFLAGS := -D__KERNEL__
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200398KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
Arnd Bergmann8c970232017-07-26 15:36:23 +0200399 -fno-strict-aliasing -fno-common -fshort-wchar \
Floris Kraaka8735822009-06-15 08:54:02 +0300400 -Werror-implicit-function-declaration \
Kirill A. Shutemov51b97e32014-10-20 12:23:12 +0300401 -Wno-format-security \
Borislav Petkovc6a38552016-11-14 19:41:31 +0100402 -std=gnu89 $(call cc-option,-fno-PIE)
403
Geert Uytterhoevena1c48bb2014-05-27 09:54:12 +0200404
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200405KBUILD_AFLAGS_KERNEL :=
406KBUILD_CFLAGS_KERNEL :=
Borislav Petkovc6a38552016-11-14 19:41:31 +0100407KBUILD_AFLAGS := -D__ASSEMBLY__ $(call cc-option,-fno-PIE)
Sam Ravnborg65881692010-07-28 17:33:09 +0200408KBUILD_AFLAGS_MODULE := -DMODULE
409KBUILD_CFLAGS_MODULE := -DMODULE
410KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700412# Read KERNELRELEASE from include/config/kernel.release (if it exists)
413KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
Michal Marekcacd54e2011-05-30 13:36:07 +0200414KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
Sam Ravnborgcb584552006-01-09 21:20:34 +0100415
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200416export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
Sam Ravnborg80ef88d2007-11-17 15:37:31 +0100417export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
Uwe Kleine-Königd7f14c62017-07-09 20:02:36 +0200418export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
Masahiro Yamada011bf122014-07-18 13:40:11 +0900419export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200420export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421
Sam Ravnborg06c50402007-10-15 22:17:25 +0200422export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
Dmitry Vyukov5c9a8752016-03-22 14:27:30 -0700423export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
Sam Ravnborg222d3942007-10-15 21:59:31 +0200424export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
Sam Ravnborg65881692010-07-28 17:33:09 +0200425export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200426export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
Michal Marek40df7592011-04-20 13:45:30 +0200427export KBUILD_ARFLAGS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428
429# When compiling out-of-tree modules, put MODVERDIR in the module
430# tree rather than in the kernel tree. The kernel tree might
431# even be read-only.
432export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
433
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434# Files to ignore in find ... statements
435
Prarit Bhargavaae63b2d2014-02-06 07:51:42 -0500436export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
437 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
438 -prune -o
Jesper Juhl450c6072012-02-16 22:49:15 +0100439export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
440 --exclude CVS --exclude .pc --exclude .hg --exclude .git
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441
442# ===========================================================================
443# Rules shared between *config targets and build targets
444
Cao jin312a3d02017-08-02 10:31:06 +0800445# Basic helpers built in scripts/basic/
Paul Smith4f193362006-03-05 17:14:10 -0500446PHONY += scripts_basic
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447scripts_basic:
448 $(Q)$(MAKE) $(build)=scripts/basic
Steven Rostedt638adb02009-11-17 10:48:25 -0500449 $(Q)rm -f .tmp_quiet_recordmcount
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450
Jan Beulichcd05e6b2005-09-06 11:47:04 +0200451# To avoid any implicit rule to kick in, define an empty command.
452scripts/basic/%: scripts_basic ;
453
Paul Smith4f193362006-03-05 17:14:10 -0500454PHONY += outputmakefile
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200455# outputmakefile generates a Makefile in the output directory, if using a
456# separate output directory. This allows convenient use of make in the
457# output directory.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458outputmakefile:
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200459ifneq ($(KBUILD_SRC),)
Andi Kleen92979992009-01-10 04:56:13 +0100460 $(Q)ln -fsn $(srctree) source
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200461 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
462 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
463endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464
Sam Ravnborgd8ecc5c2011-04-27 22:29:49 +0200465# Support for using generic headers in asm-generic
Masahiro Yamadaa9d9a402017-07-10 03:32:59 +0900466PHONY += asm-generic uapi-asm-generic
467asm-generic: uapi-asm-generic
Sam Ravnborgd8ecc5c2011-04-27 22:29:49 +0200468 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
Catalin Marinas3c5994c2012-10-17 12:25:44 +0100469 src=asm obj=arch/$(SRCARCH)/include/generated/asm
Masahiro Yamadaa9d9a402017-07-10 03:32:59 +0900470uapi-asm-generic:
Catalin Marinas3c5994c2012-10-17 12:25:44 +0100471 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
472 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
Sam Ravnborgd8ecc5c2011-04-27 22:29:49 +0200473
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474# To make sure we do not include .config for any of the *config targets
475# catch them early, and hand them over to scripts/kconfig/Makefile
476# It is allowed to specify more targets when calling make, including
477# mixing *config targets and build targets.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200478# For example 'make oldconfig all'.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479# Detect when mixed targets is specified, and make a second invocation
480# of make so .config is not included in this case either (for *config).
481
David Howells10b63952012-10-02 18:01:57 +0100482version_h := include/generated/uapi/linux/version.h
Michal Marek223c24a2014-11-27 16:13:17 +0100483old_version_h := include/linux/version.h
David Howellsd183e6f2012-10-02 18:01:56 +0100484
Roman Zippel3eb3c742007-01-10 14:45:28 +0100485no-dot-config-targets := clean mrproper distclean \
Michal Marekfbae4d52014-11-28 13:31:43 +0100486 cscope gtags TAGS tags help% %docs check% coccicheck \
David Howellsd183e6f2012-10-02 18:01:56 +0100487 $(version_h) headers_% archheaders archscripts \
Linus Torvalds4aed2fd2010-08-06 09:30:52 -0700488 kernelversion %src-pkg
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489
490config-targets := 0
491mixed-targets := 0
492dot-config := 1
493
494ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
495 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
496 dot-config := 0
497 endif
498endif
499
500ifeq ($(KBUILD_EXTMOD),)
501 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
502 config-targets := 1
Masahiro Yamadad0d38cd2014-12-11 19:12:34 +0900503 ifneq ($(words $(MAKECMDGOALS)),1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 mixed-targets := 1
505 endif
506 endif
507endif
Cao jin312a3d02017-08-02 10:31:06 +0800508# install and modules_install need also be processed one by one
Michal Mareka85a41e2015-12-10 15:53:06 +0100509ifneq ($(filter install,$(MAKECMDGOALS)),)
510 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
511 mixed-targets := 1
512 endif
513endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514
515ifeq ($(mixed-targets),1)
516# ===========================================================================
517# We're called with mixed targets (*config and build targets).
518# Handle them one by one.
519
Masahiro Yamada9319f452014-04-09 15:51:35 +0900520PHONY += $(MAKECMDGOALS) __build_one_by_one
521
522$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
523 @:
524
525__build_one_by_one:
526 $(Q)set -e; \
527 for i in $(MAKECMDGOALS); do \
528 $(MAKE) -f $(srctree)/Makefile $$i; \
529 done
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530
531else
532ifeq ($(config-targets),1)
533# ===========================================================================
534# *config targets only - make sure prerequisites are updated, and descend
535# in scripts/kconfig to make the *config target
536
537# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
538# KBUILD_DEFCONFIG may point out an alternative default configuration
539# used for 'make defconfig'
Masahiro Yamadaa436bb72015-03-27 20:43:36 +0900540include arch/$(SRCARCH)/Makefile
Al Viro61bee202008-08-25 04:51:27 -0400541export KBUILD_DEFCONFIG KBUILD_KCONFIG
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542
Sam Ravnborg31110eb2008-12-13 23:00:45 +0100543config: scripts_basic outputmakefile FORCE
Sam Ravnborg31110eb2008-12-13 23:00:45 +0100544 $(Q)$(MAKE) $(build)=scripts/kconfig $@
545
546%config: scripts_basic outputmakefile FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 $(Q)$(MAKE) $(build)=scripts/kconfig $@
548
549else
550# ===========================================================================
551# Build targets only - this includes vmlinux, arch specific targets, clean
552# targets and others. In general all targets except *config targets.
553
554ifeq ($(KBUILD_EXTMOD),)
555# Additional helpers built in scripts/
556# Carefully list dependencies so we do not try to build scripts twice
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200557# in parallel
Paul Smith4f193362006-03-05 17:14:10 -0500558PHONY += scripts
Andreas Schwaba54292f2013-04-09 19:57:00 +0200559scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
Emese Revfy6b90bd42016-05-24 00:09:38 +0200560 asm-generic gcc-plugins
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 $(Q)$(MAKE) $(build)=$(@)
562
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563# Objects we will link into vmlinux / subdirs we need to visit
564init-y := init/
Markus Trippelsdorfdf85b2d2017-09-16 11:01:16 +0200565drivers-y := drivers/ sound/ firmware/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566net-y := net/
567libs-y := lib/
568core-y := usr/
Feng Wu37d9fe42015-09-22 16:47:29 +0800569virt-y := virt/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570endif # KBUILD_EXTMOD
571
572ifeq ($(dot-config),1)
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200573# Read in config
574-include include/config/auto.conf
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200576ifeq ($(KBUILD_EXTMOD),)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577# Read in dependencies to all Kconfig* files, make sure to run
578# oldconfig if changes are detected.
Roman Zippelc955cca2006-06-08 22:12:39 -0700579-include include/config/auto.conf.cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581# To avoid any implicit rule to kick in, define an empty command
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700582$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583
Roman Zippelc955cca2006-06-08 22:12:39 -0700584# If .config is newer than include/config/auto.conf, someone tinkered
Sam Ravnborg752625c2005-12-26 23:34:03 +0100585# with it and forgot to run make oldconfig.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200586# if auto.conf.cmd is missing then we are probably in a cleaned tree so
Sam Ravnborg752625c2005-12-26 23:34:03 +0100587# we execute the config step to be sure to catch updated Kconfig files
Michal Marekbc081dd2009-12-07 16:38:33 +0100588include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
590else
Sam Ravnborg264a2682009-10-18 00:49:24 +0200591# external modules needs include/generated/autoconf.h and include/config/auto.conf
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200592# but do not care if they are up-to-date. Use auto.conf to trigger the test
593PHONY += include/config/auto.conf
594
595include/config/auto.conf:
Sam Ravnborg264a2682009-10-18 00:49:24 +0200596 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
Michal Marek5369f552012-07-07 23:04:40 +0200597 echo >&2; \
598 echo >&2 " ERROR: Kernel configuration is invalid."; \
599 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
600 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
601 echo >&2 ; \
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200602 /bin/false)
603
604endif # KBUILD_EXTMOD
Roman Zippelc955cca2006-06-08 22:12:39 -0700605
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606else
607# Dummy target needed, because used as prerequisite
Roman Zippelc955cca2006-06-08 22:12:39 -0700608include/config/auto.conf: ;
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200609endif # $(dot-config)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610
Nicolas Pitre86556392016-12-02 15:11:50 -0500611# For the kernel to actually contain only the needed exported symbols,
612# we have to build modules as well to determine what those symbols are.
613# (this can be evaluated only once include/config/auto.conf has been included)
614ifdef CONFIG_TRIM_UNUSED_KSYMS
615 KBUILD_MODULES := 1
616endif
617
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618# The all: target is the default when no target is given on the
619# command line.
620# This allow a user to issue only 'make' to build a kernel including modules
Michal Marekc8447162010-06-03 10:54:58 +0200621# Defaults to vmlinux, but the arch makefile usually adds further targets
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622all: vmlinux
623
Michal Marek6dd3f132015-07-16 18:23:53 +0200624# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
625# values of the respective KBUILD_* variables
626ARCH_CPPFLAGS :=
627ARCH_AFLAGS :=
628ARCH_CFLAGS :=
Masahiro Yamadaa436bb72015-03-27 20:43:36 +0900629include arch/$(SRCARCH)/Makefile
Geert Uytterhoevena1c48bb2014-05-27 09:54:12 +0200630
631KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
Linus Torvaldsef6000b2016-10-12 10:23:41 -0700632KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
Linus Torvaldsbd664f62017-07-12 19:25:47 -0700633KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
634KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
635KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context)
Geert Uytterhoevena1c48bb2014-05-27 09:54:12 +0200636
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
Behan Webster6748cb32017-03-27 18:19:09 -0700638KBUILD_CFLAGS += $(call cc-option,-Oz,-Os)
639KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640else
Arnd Bergmann815eb712016-04-25 17:35:28 +0200641ifdef CONFIG_PROFILE_ALL_BRANCHES
Arnd Bergmanna76bcf52016-11-10 17:44:44 +0100642KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,)
Arnd Bergmann815eb712016-04-25 17:35:28 +0200643else
644KBUILD_CFLAGS += -O2
645endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646endif
647
Arnd Bergmanna76bcf52016-11-10 17:44:44 +0100648KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
649 $(call cc-disable-warning,maybe-uninitialized,))
650
Jiri Kosina69102312014-08-06 16:08:43 -0700651# Tell gcc to never replace conditional load with a non-conditional one
652KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
653
Gleb Fotengauer-Malinovskiy7292ae32017-03-20 20:15:53 +0300654# check for 'asm goto'
655ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
656 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
657 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
658endif
659
Emese Revfy6b90bd42016-05-24 00:09:38 +0200660include scripts/Makefile.gcc-plugins
661
Andi Kleen1873e872012-03-28 11:51:18 -0700662ifdef CONFIG_READABLE_ASM
663# Disable optimizations that make assembler listings hard to read.
664# reorder blocks reorders the control in the function
665# ipa clone creates specialized cloned functions
666# partial inlining inlines only parts of functions
667KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
668 $(call cc-option,-fno-ipa-cp-clone,) \
669 $(call cc-option,-fno-partial-inlining)
670endif
671
Mike Frysinger08f67462009-06-04 16:29:08 -0700672ifneq ($(CONFIG_FRAME_WARN),0)
Andi Kleen35bb5b12008-02-22 15:15:03 +0100673KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
674endif
675
Kees Cookc965b102016-07-26 15:21:17 -0700676# This selects the stack protector compiler flag. Testing it is delayed
677# until after .config has been reprocessed, in the prepare-compiler-check
678# target.
Kees Cook87796572013-12-19 11:35:59 -0800679ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
Kees Cook19952a92013-12-19 11:35:58 -0800680 stackp-flag := -fstack-protector
Kees Cookc965b102016-07-26 15:21:17 -0700681 stackp-name := REGULAR
Jan Beulich6c15b322014-02-25 15:01:48 -0800682else
683ifdef CONFIG_CC_STACKPROTECTOR_STRONG
Kees Cook87796572013-12-19 11:35:59 -0800684 stackp-flag := -fstack-protector-strong
Kees Cookc965b102016-07-26 15:21:17 -0700685 stackp-name := STRONG
Kees Cook19952a92013-12-19 11:35:58 -0800686else
687 # Force off for distro compilers that enable stack protector by default.
688 stackp-flag := $(call cc-option, -fno-stack-protector)
Tejun Heo5d707e92009-02-09 22:17:39 +0900689endif
Jan Beulich6c15b322014-02-25 15:01:48 -0800690endif
Kees Cookc965b102016-07-26 15:21:17 -0700691# Find arch-specific stack protector compiler sanity-checking script.
692ifdef CONFIG_CC_STACKPROTECTOR
Kees Cook228d96c2016-07-26 14:26:20 -0700693 stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
694 stackp-check := $(wildcard $(stackp-path))
Kees Cookc965b102016-07-26 15:21:17 -0700695endif
Kees Cook19952a92013-12-19 11:35:58 -0800696KBUILD_CFLAGS += $(stackp-flag)
Sam Ravnborge06b8b92008-02-13 22:43:28 +0100697
Michal Marek5631d9c2015-08-19 17:36:41 +0200698ifeq ($(cc-name),clang)
Behan Webster785f11a2017-04-21 11:20:01 -0700699ifneq ($(CROSS_COMPILE),)
David Linbb3f38c2017-10-20 14:09:13 -0700700CLANG_TARGET := --target=$(notdir $(CROSS_COMPILE:%-=%))
Behan Webster785f11a2017-04-21 11:20:01 -0700701GCC_TOOLCHAIN := $(realpath $(dir $(shell which $(LD)))/..)
702endif
703ifneq ($(GCC_TOOLCHAIN),)
David Linbb3f38c2017-10-20 14:09:13 -0700704CLANG_GCC_TC := --gcc-toolchain=$(GCC_TOOLCHAIN)
Behan Webster785f11a2017-04-21 11:20:01 -0700705endif
706KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
707KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
Behan Webster61163ef2013-09-03 22:27:23 -0400708KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
Behan Webster61163ef2013-09-03 22:27:23 -0400709KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
710KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
711KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
Matthias Kaehlckebfb38982017-04-21 14:39:30 -0700712KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
Behan Webster61163ef2013-09-03 22:27:23 -0400713# Quiet clang warning: comparison of unsigned expression < 0 is always false
714KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
715# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
716# source of a reference will be _MergedGlobals and not on of the whitelisted names.
717# See modpost pattern 2
718KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
Behan Webster26ea6bb2014-07-31 21:08:25 -0700719KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
Michael Davidsona37c45c2017-04-25 15:47:35 -0700720KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
721KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
Behan Webster61163ef2013-09-03 22:27:23 -0400722else
723
Arnd Bergmannc9c68372016-05-10 23:30:01 +0200724# These warnings generated too much noise in a regular build.
Seung-Woo Kim35288e32017-03-10 11:01:00 +0900725# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
Michal Marek8417da6f2011-05-02 12:51:15 +0200726KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
Arnd Bergmannc9c68372016-05-10 23:30:01 +0200727KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
Behan Webster61163ef2013-09-03 22:27:23 -0400728endif
Dave Jonesaf0e5d52011-04-21 17:28:13 -0400729
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730ifdef CONFIG_FRAME_POINTER
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200731KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732else
Rabin Vincent7e9501f2010-08-10 19:20:53 +0100733# Some targets (ARM with Thumb2, for example), can't be built with frame
734# pointers. For those, we don't have FUNCTION_TRACER automatically
735# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
736# incompatible with -fomit-frame-pointer with current GCC, so we don't use
737# -fomit-frame-pointer with FUNCTION_TRACER.
738ifndef CONFIG_FUNCTION_TRACER
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200739KBUILD_CFLAGS += -fomit-frame-pointer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740endif
Rabin Vincent7e9501f2010-08-10 19:20:53 +0100741endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742
Linus Torvalds2062afb2014-07-26 14:52:01 -0700743KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
744
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745ifdef CONFIG_DEBUG_INFO
Andi Kleen866ced92014-07-30 20:50:18 +0200746ifdef CONFIG_DEBUG_INFO_SPLIT
747KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
748else
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200749KBUILD_CFLAGS += -g
Andi Kleen866ced92014-07-30 20:50:18 +0200750endif
Behan Webster22883282014-02-14 15:19:17 -0800751KBUILD_AFLAGS += -Wa,-gdwarf-2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752endif
Andi Kleenbfaf2dd2014-07-30 20:50:19 +0200753ifdef CONFIG_DEBUG_INFO_DWARF4
754KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
755endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756
Andi Kleend6f4ceb2010-07-14 15:43:52 +0200757ifdef CONFIG_DEBUG_INFO_REDUCED
Andi Kleene82c4bb2013-02-07 13:58:40 -0800758KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
759 $(call cc-option,-fno-var-tracking)
Andi Kleend6f4ceb2010-07-14 15:43:52 +0200760endif
761
Steven Rostedt606576c2008-10-06 19:06:12 -0400762ifdef CONFIG_FUNCTION_TRACER
Heiko Carstensc0a80c02015-01-09 13:06:33 +0100763ifndef CC_FLAGS_FTRACE
764CC_FLAGS_FTRACE := -pg
765endif
766export CC_FLAGS_FTRACE
Steven Rostedta2546fa2011-02-09 13:15:59 -0500767ifdef CONFIG_HAVE_FENTRY
768CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
769endif
Heiko Carstensc0a80c02015-01-09 13:06:33 +0100770KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
Steven Rostedta2546fa2011-02-09 13:15:59 -0500771KBUILD_AFLAGS += $(CC_USING_FENTRY)
Steven Rostedt72441cb2010-10-13 17:12:30 -0400772ifdef CONFIG_DYNAMIC_FTRACE
Steven Rostedtcf4db252010-10-14 23:32:44 -0400773 ifdef CONFIG_HAVE_C_RECORDMCOUNT
Steven Rostedt72441cb2010-10-13 17:12:30 -0400774 BUILD_C_RECORDMCOUNT := y
775 export BUILD_C_RECORDMCOUNT
776 endif
777endif
Arnaldo Carvalho de Melo16444a82008-05-12 21:20:42 +0200778endif
779
Sam Ravnborg91341d42008-01-21 21:31:44 +0100780# We trigger additional mismatches with less inlining
781ifdef CONFIG_DEBUG_SECTION_MISMATCH
782KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
783endif
784
Masahiro Yamada90ad4052017-04-14 15:17:26 +0900785ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
786KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,)
787KBUILD_CFLAGS += $(call cc-option,-fdata-sections,)
788endif
789
Sam Ravnborge8e69932005-04-30 16:51:42 -0700790# arch Makefile may override CC so keep this after arch Makefile is included
Rik van Riele8f5bdb02005-05-16 21:53:46 -0700791NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
Sam Ravnborge8e69932005-04-30 16:51:42 -0700792CHECKFLAGS += $(NOSTDINC_FLAGS)
793
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794# warn about C99 declaration after statement
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200795KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200797# disable pointer signed / unsigned warnings in gcc 4.0
Michal Marek8417da6f2011-05-02 12:51:15 +0200798KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799
Kirill Smelkovfe8d0a42009-04-09 15:34:34 +0400800# disable invalid "can't wrap" optimizations for signed / pointers
Linus Torvaldsa1378022009-07-12 11:25:04 -0700801KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
Linus Torvaldsd0115552009-03-19 15:53:19 -0700802
Andi Kleen8f7f5c92009-09-18 12:49:37 -0700803# conserve stack if available
804KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
805
Sergei Trofimovich80970472013-09-13 14:51:40 -0700806# disallow errors like 'EXPORT_GPL(foo);' with missing header
807KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
808
809# require functions to have arguments in prototypes, not empty 'int foo()'
810KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
811
Josh Triplettfe7c36c2013-12-23 13:56:06 -0800812# Prohibit date/time macros, which would make the build non-deterministic
813KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
814
Daniel Wagnerea8daa72016-03-08 09:29:09 +0100815# enforce correct pointer usage
816KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
817
Kees Cookc834f0e2017-03-20 17:14:11 -0700818# Require designated initializers for all marked structures
819KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
820
Michal Marek40df7592011-04-20 13:45:30 +0200821# use the deterministic mode of AR if available
822KBUILD_ARFLAGS := $(call ar-option,D)
823
Masahiro Yamadaa436bb72015-03-27 20:43:36 +0900824include scripts/Makefile.kasan
825include scripts/Makefile.extrawarn
Andrey Ryabininc6d30852016-01-20 15:00:55 -0800826include scripts/Makefile.ubsan
Masahiro Yamadaa86fe352014-04-14 18:27:10 +0900827
Michal Marek61754c12015-07-01 17:19:30 +0200828# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
829# last assignments
830KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
831KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
832KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
Sam Ravnborg52bcc332007-10-15 22:03:58 +0200833
Roland McGrath18991192007-07-19 01:48:40 -0700834# Use --build-id when available.
Rabin Vincentbd743702017-04-30 18:16:00 +0200835LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\
Sam Ravnborgf86fd302009-09-19 10:14:33 +0200836 $(call cc-ldoption, -Wl$(comma)--build-id,))
Sam Ravnborg65881692010-07-28 17:33:09 +0200837KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
Roland McGrath18991192007-07-19 01:48:40 -0700838LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
839
Nicholas Pigginb67067f2016-08-24 22:29:20 +1000840ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
841LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
842endif
843
David Howells5d7d18f2009-03-04 11:59:07 -0800844ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
Andi Kleend79a2712009-09-16 22:36:55 +0200845LDFLAGS_vmlinux += $(call ld-option, -X,)
David Howells5d7d18f2009-03-04 11:59:07 -0800846endif
847
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848# Default kernel image to build when no specific target is given.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200849# KBUILD_IMAGE may be overruled on the command line or
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850# set in the environment
851# Also any assignments in arch/$(ARCH)/Makefile take precedence over
852# this default value
853export KBUILD_IMAGE ?= vmlinux
854
855#
856# INSTALL_PATH specifies where to place the updated kernel and system map
857# images. Default is /boot, but you can set it to other values
858export INSTALL_PATH ?= /boot
859
860#
Jason Cooperf4d4ffc2013-12-01 23:56:28 +0000861# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
862# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
863# an argument if needed. Otherwise it defaults to the kernel install path
864#
865export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
866
867#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
869# relocations required by build roots. This is not defined in the
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200870# makefile but the argument can be passed to make if needed.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871#
872
Sam Ravnborgdf9df032006-01-16 12:46:07 +0100873MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874export MODLIB
875
Theodore Ts'oac031f22006-06-21 20:53:09 -0400876#
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +0900877# INSTALL_MOD_STRIP, if defined, will cause modules to be
878# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
879# the default option --strip-debug will be used. Otherwise,
880# INSTALL_MOD_STRIP value will be used as the options to the strip command.
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100881
Theodore Ts'oac031f22006-06-21 20:53:09 -0400882ifdef INSTALL_MOD_STRIP
883ifeq ($(INSTALL_MOD_STRIP),1)
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100884mod_strip_cmd = $(STRIP) --strip-debug
Theodore Ts'oac031f22006-06-21 20:53:09 -0400885else
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100886mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
Theodore Ts'oac031f22006-06-21 20:53:09 -0400887endif # INSTALL_MOD_STRIP=1
888else
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100889mod_strip_cmd = true
Theodore Ts'oac031f22006-06-21 20:53:09 -0400890endif # INSTALL_MOD_STRIP
891export mod_strip_cmd
892
Bertrand Jacquinbeb50df2014-08-27 20:31:56 +0930893# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
894# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
895# or CONFIG_MODULE_COMPRESS_XZ.
896
897mod_compress_cmd = true
898ifdef CONFIG_MODULE_COMPRESS
899 ifdef CONFIG_MODULE_COMPRESS_GZIP
Jason A. Donenfeld3d1450d2015-07-07 20:26:07 +0200900 mod_compress_cmd = gzip -n -f
Bertrand Jacquinbeb50df2014-08-27 20:31:56 +0930901 endif # CONFIG_MODULE_COMPRESS_GZIP
902 ifdef CONFIG_MODULE_COMPRESS_XZ
Jason A. Donenfeld3d1450d2015-07-07 20:26:07 +0200903 mod_compress_cmd = xz -f
Bertrand Jacquinbeb50df2014-08-27 20:31:56 +0930904 endif # CONFIG_MODULE_COMPRESS_XZ
905endif # CONFIG_MODULE_COMPRESS
906export mod_compress_cmd
907
P J P1bf49dd2013-11-12 15:11:44 -0800908# Select initial ramdisk compression format, default is gzip(1).
909# This shall be used by the dracut(8) tool while creating an initramfs image.
910#
Jan Beulich7ac18152013-12-18 17:08:57 -0800911INITRD_COMPRESS-y := gzip
912INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
913INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
914INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
915INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
916INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
Linus Torvaldsb7000ad2013-12-20 16:52:45 -0800917# do not export INITRD_COMPRESS, since we didn't actually
918# choose a sane default compression above.
919# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920
Michal Marekd9d8d7e2013-01-25 13:41:31 +1030921ifdef CONFIG_MODULE_SIG_ALL
David Woodhouse3ee550f2015-08-14 16:17:16 +0100922$(eval $(call config_filename,MODULE_SIG_KEY))
923
924mod_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 +1030925else
926mod_sign_cmd = true
927endif
928export mod_sign_cmd
929
Josh Poimboeuf9f0c18a2017-02-15 12:21:17 -0600930ifdef CONFIG_STACK_VALIDATION
931 has_libelf := $(call try-run,\
932 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
933 ifeq ($(has_libelf),1)
934 objtool_target := tools/objtool FORCE
935 else
Josh Poimboeuf3dd40cb2017-10-03 20:10:36 -0500936 ifdef CONFIG_ORC_UNWINDER
937 $(error "Cannot generate ORC metadata for CONFIG_ORC_UNWINDER=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
938 else
939 $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
940 endif
Josh Poimboeuf9f0c18a2017-02-15 12:21:17 -0600941 SKIP_STACK_VALIDATION := 1
942 export SKIP_STACK_VALIDATION
943 endif
944endif
945
Rusty Russelle2a666d2012-10-19 11:53:15 +1030946
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947ifeq ($(KBUILD_EXTMOD),)
David Howellscfc411e2015-08-14 15:20:41 +0100948core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949
950vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
951 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
Feng Wu37d9fe42015-09-22 16:47:29 +0800952 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953
954vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
Feng Wu37d9fe42015-09-22 16:47:29 +0800955 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956
957init-y := $(patsubst %/, %/built-in.o, $(init-y))
958core-y := $(patsubst %/, %/built-in.o, $(core-y))
959drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
960net-y := $(patsubst %/, %/built-in.o, $(net-y))
961libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
Nicholas Piggin3a166fc2017-06-20 01:52:05 +1000962libs-y2 := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y)))
Feng Wu37d9fe42015-09-22 16:47:29 +0800963virt-y := $(patsubst %/, %/built-in.o, $(virt-y))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200965# Externally visible symbols (used by link-vmlinux.sh)
Sam Ravnborg95698572012-05-05 10:18:40 +0200966export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
Nicholas Piggin3a166fc2017-06-20 01:52:05 +1000967export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
968export KBUILD_VMLINUX_LIBS := $(libs-y1)
Sam Ravnborg95698572012-05-05 10:18:40 +0200969export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200970export LDFLAGS_vmlinux
Cao jin312a3d02017-08-02 10:31:06 +0800971# used by scripts/package/Makefile
Feng Wu37d9fe42015-09-22 16:47:29 +0800972export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973
Nicholas Piggin3a166fc2017-06-20 01:52:05 +1000974vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975
Nicolas Pitre2441e782016-04-22 15:25:00 -0400976# Include targets which we want to execute sequentially if the rest of the
977# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
978# evaluated more than once.
979PHONY += vmlinux_prereq
980vmlinux_prereq: $(vmlinux-deps) FORCE
David Woodhouse0f836e5f2006-10-11 01:21:43 -0700981ifdef CONFIG_HEADERS_CHECK
David Woodhouse0e7af8d042006-10-13 16:04:23 +0100982 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
David Woodhouse0f836e5f2006-10-11 01:21:43 -0700983endif
Jan Kiszka3ee7b3f2015-02-17 13:46:36 -0800984ifdef CONFIG_GDB_SCRIPTS
Masahiro Yamada8e9b4662017-08-20 15:04:11 +0900985 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
Jan Kiszka3ee7b3f2015-02-17 13:46:36 -0800986endif
Nicolas Pitre2441e782016-04-22 15:25:00 -0400987ifdef CONFIG_TRIM_UNUSED_KSYMS
Nicolas Ferreba79d402016-04-25 17:55:08 +0200988 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
Nicolas Pitre86556392016-12-02 15:11:50 -0500989 "$(MAKE) -f $(srctree)/Makefile vmlinux"
Nicolas Pitre2441e782016-04-22 15:25:00 -0400990endif
Nicolas Pitre23121ca2016-01-26 21:50:18 -0500991
992# standalone target for easier testing
993include/generated/autoksyms.h: FORCE
Nicolas Ferreba79d402016-04-25 17:55:08 +0200994 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
Nicolas Pitre23121ca2016-01-26 21:50:18 -0500995
Nicholas Pigginfbe6e372016-08-24 22:29:21 +1000996ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
997
998# Final link of vmlinux with optional arch pass after final link
Cao jin312a3d02017-08-02 10:31:06 +0800999cmd_link-vmlinux = \
1000 $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ; \
Nicholas Pigginfbe6e372016-08-24 22:29:21 +10001001 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
Nicolas Pitre2441e782016-04-22 15:25:00 -04001002
Nicolas Pitreedf69472016-04-26 16:48:44 -04001003vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +02001004 +$(call if_changed,link-vmlinux)
Sam Ravnborg741f98f2007-07-17 10:54:06 +02001005
Nicolas Pitredd924782016-02-28 22:00:00 -05001006# Build samples along the rest of the kernel
1007ifdef CONFIG_SAMPLES
1008vmlinux-dirs += samples
1009endif
1010
Masahiro Yamada38385f82014-04-28 16:26:18 +09001011# The actual objects are generated when descending,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012# make sure no implicit rule kicks in
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +02001013$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014
1015# Handle descending into subdirectories listed in $(vmlinux-dirs)
1016# Preset locale variables to speed up the build process. Limit locale
1017# tweaks to this spot to avoid wrong language settings when running
1018# make menuconfig etc.
1019# Error messages still appears in the original language
1020
Paul Smith4f193362006-03-05 17:14:10 -05001021PHONY += $(vmlinux-dirs)
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001022$(vmlinux-dirs): prepare scripts
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023 $(Q)$(MAKE) $(build)=$@
1024
Michal Marek0d0e7712013-07-11 15:34:51 +02001025define filechk_kernel.release
1026 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1027endef
1028
Geert Uytterhoeven83a35e32013-06-28 11:27:31 +02001029# Store (new) KERNELRELEASE string in include/config/kernel.release
Roman Zippelf1d28fb2006-06-08 22:12:43 -07001030include/config/kernel.release: include/config/auto.conf FORCE
Michal Marek0d0e7712013-07-11 15:34:51 +02001031 $(call filechk,kernel.release)
Sam Ravnborgcb584552006-01-09 21:20:34 +01001032
1033
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034# Things we need to do before we recursively start building the kernel
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001035# or the modules are listed in "prepare".
1036# A multi level approach is used. prepareN is processed before prepareN-1.
1037# archprepare is used in arch Makefiles and when processed asm symlink,
1038# version.h and scripts_basic is processed / created.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001040# Listed in dependency order
Paul Smith4f193362006-03-05 17:14:10 -05001041PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001042
Sam Ravnborg86feeaa2005-09-09 19:28:28 +02001043# prepare3 is used to check if we are building in a separate output directory,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044# and if so do:
1045# 1) Check that make has not been executed in the kernel src $(srctree)
Roman Zippelf1d28fb2006-06-08 22:12:43 -07001046prepare3: include/config/kernel.release
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047ifneq ($(KBUILD_SRC),)
Mike Frysingerfd54f502008-11-06 03:31:35 -05001048 @$(kecho) ' Using $(srctree) as source for kernel'
Roman Zippelc955cca2006-06-08 22:12:39 -07001049 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
Michal Marek5369f552012-07-07 23:04:40 +02001050 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1051 echo >&2 " in the '$(srctree)' directory.";\
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052 /bin/false; \
1053 fi;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054endif
1055
Kees Cookc965b102016-07-26 15:21:17 -07001056# prepare2 creates a makefile if using a separate output directory.
1057# From this point forward, .config has been reprocessed, so any rules
1058# that need to depend on updated CONFIG_* values can be checked here.
1059prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060
David Howellsd183e6f2012-10-02 18:01:56 +01001061prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
Sam Ravnborgf7f16b72009-10-18 00:00:43 +02001062 include/config/auto.conf
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001063 $(cmd_crmodverdir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064
H. Peter Anvin6520fe52012-05-08 21:22:24 +03001065archprepare: archheaders archscripts prepare1 scripts_basic
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001066
Emese Revfy6b90bd42016-05-24 00:09:38 +02001067prepare0: archprepare gcc-plugins
Sam Ravnborg8d36a622005-09-10 21:05:36 +02001068 $(Q)$(MAKE) $(build)=.
Sam Ravnborg86feeaa2005-09-09 19:28:28 +02001069
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070# All the preparing..
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -06001071prepare: prepare0 prepare-objtool
1072
1073PHONY += prepare-objtool
Josh Poimboeuf3b27a0c2016-03-03 11:39:30 -06001074prepare-objtool: $(objtool_target)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075
Kees Cookc965b102016-07-26 15:21:17 -07001076# Check for CONFIG flags that require compiler support. Abort the build
1077# after .config has been processed, but before the kernel build starts.
1078#
1079# For security-sensitive CONFIG options, we don't want to fallback and/or
1080# silently change which compiler flags will be used, since that leads to
1081# producing kernels with different security feature characteristics
1082# depending on the compiler used. (For example, "But I selected
1083# CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1084PHONY += prepare-compiler-check
1085prepare-compiler-check: FORCE
1086# Make sure compiler supports requested stack protector flag.
1087ifdef stackp-name
1088 ifeq ($(call cc-option, $(stackp-flag)),)
1089 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1090 $(stackp-flag) not supported by compiler >&2 && exit 1
1091 endif
1092endif
1093# Make sure compiler does not have buggy stack-protector support.
1094ifdef stackp-check
1095 ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1096 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1097 $(stackp-flag) available but compiler is broken >&2 && exit 1
1098 endif
1099endif
1100 @:
1101
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102# Generate some files
1103# ---------------------------------------------------------------------------
1104
1105# KERNELRELEASE can change from a few different places, meaning version.h
1106# needs to be updated, so this check is forced on all builds
1107
1108uts_len := 64
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001109define filechk_utsrelease.h
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001111 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1112 exit 1; \
1113 fi; \
1114 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115endef
1116
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001117define filechk_version.h
Jesper Juhl450c6072012-02-16 22:49:15 +01001118 (echo \#define LINUX_VERSION_CODE $(shell \
1119 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001120 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1121endef
1122
David Howellsd183e6f2012-10-02 18:01:56 +01001123$(version_h): $(srctree)/Makefile FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124 $(call filechk,version.h)
Michal Marek223c24a2014-11-27 16:13:17 +01001125 $(Q)rm -f $(old_version_h)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126
Sam Ravnborg273b2812009-10-18 00:52:28 +02001127include/generated/utsrelease.h: include/config/kernel.release FORCE
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001128 $(call filechk,utsrelease.h)
1129
Vegard Nossum179efcb2008-12-16 12:33:43 +01001130PHONY += headerdep
1131headerdep:
Peter Foley9663d982011-04-26 17:17:11 -04001132 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1133 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
Vegard Nossum179efcb2008-12-16 12:33:43 +01001134
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135# ---------------------------------------------------------------------------
David Woodhouse8d730cf2006-06-18 11:58:39 +01001136# Kernel headers
David Woodhouse8d730cf2006-06-18 11:58:39 +01001137
Sam Ravnborge6883b12008-06-05 16:43:46 +02001138#Default location for installed headers
1139export INSTALL_HDR_PATH = $(objtree)/usr
1140
Masahiro Yamada0f042ee2017-07-10 03:32:34 +09001141# If we do an all arch process set dst to include/arch-$(hdr-arch)
Nicolas Dichtel61562f92017-03-27 14:20:16 +02001142hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(hdr-arch), dst=include)
Sam Ravnborge6883b12008-06-05 16:43:46 +02001143
H. Peter Anvin052ad272011-11-17 13:17:35 -08001144PHONY += archheaders
1145archheaders:
1146
H. Peter Anvin6520fe52012-05-08 21:22:24 +03001147PHONY += archscripts
1148archscripts:
1149
Sam Ravnborge6883b12008-06-05 16:43:46 +02001150PHONY += __headers
Masahiro Yamadaa9d9a402017-07-10 03:32:59 +09001151__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
Mike Waychisone1b702c2011-03-14 23:34:25 -07001152 $(Q)$(MAKE) $(build)=scripts build_unifdef
David Woodhouse6d716272006-09-24 22:16:03 +01001153
1154PHONY += headers_install_all
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001155headers_install_all:
1156 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
David Woodhouse6d716272006-09-24 22:16:03 +01001157
David Woodhouse8d730cf2006-06-18 11:58:39 +01001158PHONY += headers_install
Sam Ravnborge6883b12008-06-05 16:43:46 +02001159headers_install: __headers
David Howells10b63952012-10-02 18:01:57 +01001160 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1161 $(error Headers not exportable for the $(SRCARCH) architecture))
Masahiro Yamadaa8ff49a2017-07-10 03:32:35 +09001162 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
Nicolas Dichtel61562f92017-03-27 14:20:16 +02001163 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi $(hdr-dst)
David Woodhouse8d730cf2006-06-18 11:58:39 +01001164
Mike Frysinger1f857122007-02-14 00:33:02 -08001165PHONY += headers_check_all
1166headers_check_all: headers_install_all
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001167 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
Mike Frysinger1f857122007-02-14 00:33:02 -08001168
David Woodhouse68475352006-06-18 12:02:10 +01001169PHONY += headers_check
1170headers_check: headers_install
Masahiro Yamadaa8ff49a2017-07-10 03:32:35 +09001171 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
Masahiro Yamada05d8cba2017-05-16 14:15:03 +09001172 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi $(hdr-dst) HDRCHECK=1
David Woodhouse68475352006-06-18 12:02:10 +01001173
David Woodhouse8d730cf2006-06-18 11:58:39 +01001174# ---------------------------------------------------------------------------
Shuah Khan5a5da782014-08-07 13:07:46 -06001175# Kernel selftest
1176
1177PHONY += kselftest
1178kselftest:
Shuah Khan2bc84522017-09-06 16:44:35 -06001179 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
Shuah Khan5a5da782014-08-07 13:07:46 -06001180
Shuah Khan801d2e92017-08-18 15:54:41 -06001181PHONY += kselftest-clean
Wang Longdcb825a2015-10-08 02:41:18 +00001182kselftest-clean:
Shuah Khan2bc84522017-09-06 16:44:35 -06001183 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
Wang Longdcb825a2015-10-08 02:41:18 +00001184
Bamvor Jian Zhang3d6dee72016-01-08 15:27:34 +08001185PHONY += kselftest-merge
1186kselftest-merge:
1187 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1188 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1189 -m $(objtree)/.config \
1190 $(srctree)/tools/testing/selftests/*/config
1191 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1192
Shuah Khan5a5da782014-08-07 13:07:46 -06001193# ---------------------------------------------------------------------------
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194# Modules
1195
1196ifdef CONFIG_MODULES
1197
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001198# By default, build modules as well
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199
Michal Marek73d13932010-03-10 12:28:58 +01001200all: modules
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +09001202# Build modules
Tejun Heo551559e2007-12-07 21:04:30 +09001203#
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +09001204# A module can be listed more than once in obj-m resulting in
1205# duplicate lines in modules.order files. Those are removed
1206# using awk while concatenating to the final file.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207
Paul Smith4f193362006-03-05 17:14:10 -05001208PHONY += modules
Michal Marek2da30e72010-06-07 22:22:12 +02001209modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
Tejun Heo551559e2007-12-07 21:04:30 +09001210 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
Mike Frysingerfd54f502008-11-06 03:31:35 -05001211 @$(kecho) ' Building modules, stage 2.';
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001212 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213
Michal Mareka6c36632010-03-08 10:07:12 +01001214modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1215 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1216
Michal Marek73d13932010-03-10 12:28:58 +01001217%/modules.builtin: include/config/auto.conf
Michal Mareka6c36632010-03-08 10:07:12 +01001218 $(Q)$(MAKE) $(modbuiltin)=$*
1219
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220
1221# Target to prepare building external modules
Paul Smith4f193362006-03-05 17:14:10 -05001222PHONY += modules_prepare
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001223modules_prepare: prepare scripts
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224
1225# Target to install modules
Paul Smith4f193362006-03-05 17:14:10 -05001226PHONY += modules_install
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227modules_install: _modinst_ _modinst_post
1228
Paul Smith4f193362006-03-05 17:14:10 -05001229PHONY += _modinst_
Michal Marek2da30e72010-06-07 22:22:12 +02001230_modinst_:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231 @rm -rf $(MODLIB)/kernel
1232 @rm -f $(MODLIB)/source
1233 @mkdir -p $(MODLIB)/kernel
Masahiro Yamada8e9b4662017-08-20 15:04:11 +09001234 @ln -s $(abspath $(srctree)) $(MODLIB)/source
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1236 rm -f $(MODLIB)/build ; \
Michal Marek7e1c0472014-04-25 17:29:45 +02001237 ln -s $(CURDIR) $(MODLIB)/build ; \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238 fi
Tejun Heo551559e2007-12-07 21:04:30 +09001239 @cp -f $(objtree)/modules.order $(MODLIB)/
Michal Marekbc081dd2009-12-07 16:38:33 +01001240 @cp -f $(objtree)/modules.builtin $(MODLIB)/
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001241 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001243# This depmod is only for convenience to give the initial
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244# boot a modules.dep even before / is mounted read-write. However the
1245# boot script depmod is the master version.
Paul Smith4f193362006-03-05 17:14:10 -05001246PHONY += _modinst_post
Linus Torvalds6d128e12013-07-10 19:02:51 -07001247_modinst_post: _modinst_
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001248 $(call cmd,depmod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249
Josh Boyerd890f512012-11-05 09:09:24 +10301250ifeq ($(CONFIG_MODULE_SIG), y)
1251PHONY += modules_sign
1252modules_sign:
1253 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1254endif
1255
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256else # CONFIG_MODULES
1257
1258# Modules not configured
1259# ---------------------------------------------------------------------------
1260
Masahiro Yamada612e47c2016-03-13 09:39:22 +09001261PHONY += modules modules_install
1262modules modules_install:
Michal Marek5369f552012-07-07 23:04:40 +02001263 @echo >&2
1264 @echo >&2 "The present kernel configuration has modules disabled."
1265 @echo >&2 "Type 'make config' and enable loadable module support."
1266 @echo >&2 "Then build a kernel with module support enabled."
1267 @echo >&2
Linus Torvalds1da177e2005-04-16 15:20:36 -07001268 @exit 1
1269
1270endif # CONFIG_MODULES
1271
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272###
1273# Cleaning is done on three levels.
1274# make clean Delete most generated files
1275# Leave enough to build external modules
1276# make mrproper Delete the current configuration, and all generated files
1277# make distclean Remove editor backup files, patch leftover files and the like
1278
1279# Directories & files removed with 'make clean'
1280CLEAN_DIRS += $(MODVERDIR)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281
1282# Directories & files removed with 'make mrproper'
Sam Ravnborgd8ecc5c2011-04-27 22:29:49 +02001283MRPROPER_DIRS += include/config usr/include include/generated \
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +09001284 arch/*/include/generated .tmp_objdiff
Masahiro Yamadac22bd32c2015-01-08 17:29:38 +09001285MRPROPER_FILES += .config .config.old .version .old_version \
Rusty Russelld5b71932012-10-02 14:35:24 +09301286 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
David Woodhousefb117942015-07-20 21:16:30 +01001287 signing_key.pem signing_key.priv signing_key.x509 \
1288 x509.genkey extra_certificates signing_key.x509.keyid \
Jan Kiszka3ee7b3f2015-02-17 13:46:36 -08001289 signing_key.x509.signer vmlinux-gdb.py
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290
1291# clean - Delete most, but leave enough to build external modules
1292#
1293clean: rm-dirs := $(CLEAN_DIRS)
1294clean: rm-files := $(CLEAN_FILES)
Gerard Snitselaarfb68d4b2012-02-04 02:55:59 -07001295clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296
Pawel Mollbd1ee802012-10-29 11:23:02 +00001297PHONY += $(clean-dirs) clean archclean vmlinuxclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298$(clean-dirs):
1299 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1300
Pawel Mollbd1ee802012-10-29 11:23:02 +00001301vmlinuxclean:
1302 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
Nicholas Pigginfbe6e372016-08-24 22:29:21 +10001303 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
Pawel Mollbd1ee802012-10-29 11:23:02 +00001304
1305clean: archclean vmlinuxclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306
1307# mrproper - Delete all generated files, including .config
1308#
1309mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1310mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
Mauro Carvalho Chehabcb43fb52017-05-14 11:50:01 -03001311mrproper-dirs := $(addprefix _mrproper_,scripts)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312
Paul Smith4f193362006-03-05 17:14:10 -05001313PHONY += $(mrproper-dirs) mrproper archmrproper
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314$(mrproper-dirs):
1315 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1316
1317mrproper: clean archmrproper $(mrproper-dirs)
1318 $(call cmd,rmdirs)
1319 $(call cmd,rmfiles)
1320
1321# distclean
1322#
Paul Smith4f193362006-03-05 17:14:10 -05001323PHONY += distclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324
1325distclean: mrproper
1326 @find $(srctree) $(RCS_FIND_IGNORE) \
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001327 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
Masahiro Yamadaf78271d2017-01-22 23:02:32 +09001328 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1329 -o -name 'core' \) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330 -type f -print | xargs rm -f
1331
1332
1333# Packaging of the kernel to various formats
1334# ---------------------------------------------------------------------------
1335# rpm target kept for backward compatibility
Michal Marekc79624c2014-07-04 22:53:52 +02001336package-dir := scripts/package
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337
Arnaldo Carvalho de Melobafb6742010-06-07 07:44:25 -03001338%src-pkg: FORCE
1339 $(Q)$(MAKE) $(build)=$(package-dir) $@
Zach Brown031ecc62006-06-08 22:12:37 -07001340%pkg: include/config/kernel.release FORCE
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001341 $(Q)$(MAKE) $(build)=$(package-dir) $@
Zach Brown031ecc62006-06-08 22:12:37 -07001342rpm: include/config/kernel.release FORCE
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001343 $(Q)$(MAKE) $(build)=$(package-dir) $@
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344
1345
1346# Brief documentation of the typical targets used
1347# ---------------------------------------------------------------------------
1348
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001349boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
Konstantin Khlebnikova1e7b7b2014-10-28 17:18:20 +04001350boards := $(sort $(notdir $(boards)))
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001351board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1352board-dirs := $(sort $(notdir $(board-dirs:/=)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353
Masahiro Yamadafe69b422016-03-13 09:39:55 +09001354PHONY += help
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355help:
1356 @echo 'Cleaning targets:'
Samuel Tardieu5ea084e2006-12-12 19:09:40 +01001357 @echo ' clean - Remove most generated files but keep the config and'
Jesper Juhl5cc8d242006-09-24 14:01:08 +02001358 @echo ' enough build support to build external modules'
Samuel Tardieu5ea084e2006-12-12 19:09:40 +01001359 @echo ' mrproper - Remove all generated files + config + various backup files'
Jesper Juhl5cc8d242006-09-24 14:01:08 +02001360 @echo ' distclean - mrproper + remove editor backup and patch files'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001361 @echo ''
1362 @echo 'Configuration targets:'
1363 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1364 @echo ''
1365 @echo 'Other generic targets:'
1366 @echo ' all - Build all targets marked with [*]'
1367 @echo '* vmlinux - Build the bare kernel'
1368 @echo '* modules - Build all modules'
Bodo Eggert9cc5d742005-11-23 20:11:34 +01001369 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370 @echo ' dir/ - Build all files in dir and below'
Wang YanQing40ab87a2015-12-11 00:35:19 +08001371 @echo ' dir/file.[ois] - Build specified target only'
Vinícius Tinti433db3e2017-04-24 13:04:58 -07001372 @echo ' dir/file.ll - Build the LLVM assembly file'
1373 @echo ' (requires compiler support for LLVM assembly generation)'
Joe Perches62718972010-01-13 09:31:44 -08001374 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1375 @echo ' (requires a recent binutils and recent build (System.map))'
Sam Ravnborg155ad602005-07-07 17:56:08 -07001376 @echo ' dir/file.ko - Build module including final link'
Robert P. J. Dayc4d5ee62009-04-24 12:35:23 -04001377 @echo ' modules_prepare - Set up for building external modules'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378 @echo ' tags/TAGS - Generate tags file for editors'
1379 @echo ' cscope - Generate cscope index'
Jianbin Kangf4ed1002011-01-14 20:07:05 +08001380 @echo ' gtags - Generate GNU GLOBAL index'
Michal Marek3f1d9a62014-07-11 15:57:24 +02001381 @echo ' kernelrelease - Output the release version string (use with make -s)'
1382 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1383 @echo ' image_name - Output the image name (use with make -s)'
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001384 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
Geert Uytterhoeven59df3232007-01-29 13:47:01 +01001385 echo ' (default: $(INSTALL_HDR_PATH))'; \
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001386 echo ''
Randy Dunlap31b8cc82017-05-08 15:55:08 -07001387 @echo 'Static analysers:'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388 @echo ' checkstack - Generate a list of stack hogs'
1389 @echo ' namespacecheck - Name space analysis on compiled kernel'
Sam Ravnborgaa025e72007-11-14 21:34:55 +01001390 @echo ' versioncheck - Sanity check on version.h usage'
Randy Dunlapec2d9872007-11-04 12:01:55 -08001391 @echo ' includecheck - Check for duplicate included header files'
Adrian Bunk295ac052007-08-24 23:04:56 +02001392 @echo ' export_report - List the usages of all exported symbols'
Vegard Nossum179efcb2008-12-16 12:33:43 +01001393 @echo ' headers_check - Sanity check on exported headers'
Nicolas Palix74425ee2010-06-06 17:15:01 +02001394 @echo ' headerdep - Detect inclusion cycles in headers'
1395 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1396 @echo ''
Randy Dunlap31b8cc82017-05-08 15:55:08 -07001397 @echo 'Kernel selftest:'
Shuah Khan5a5da782014-08-07 13:07:46 -06001398 @echo ' kselftest - Build and run kernel selftest (run as root)'
1399 @echo ' Build, install, and boot kernel before'
1400 @echo ' running kselftest on it'
Wang Longdcb825a2015-10-08 02:41:18 +00001401 @echo ' kselftest-clean - Remove all generated kselftest files'
Randy Dunlapbbfe63b2017-10-06 17:17:52 -07001402 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing'
Bamvor Jian Zhang3d6dee72016-01-08 15:27:34 +08001403 @echo ' .config.'
Shuah Khan5a5da782014-08-07 13:07:46 -06001404 @echo ''
Randy Dunlap31b8cc82017-05-08 15:55:08 -07001405 @echo 'Userspace tools targets:'
1406 @echo ' use "make tools/help"'
1407 @echo ' or "cd tools; make help"'
1408 @echo ''
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409 @echo 'Kernel packaging:'
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001410 @$(MAKE) $(build)=$(package-dir) help
Linus Torvalds1da177e2005-04-16 15:20:36 -07001411 @echo ''
1412 @echo 'Documentation targets:'
Mauro Carvalho Chehabcb43fb52017-05-14 11:50:01 -03001413 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414 @echo ''
Andres Salomon01dee182008-04-25 22:34:58 -04001415 @echo 'Architecture specific targets ($(SRCARCH)):'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416 @$(if $(archhelp),$(archhelp),\
Andres Salomon01dee182008-04-25 22:34:58 -04001417 echo ' No architecture specific help defined for $(SRCARCH)')
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418 @echo ''
1419 @$(if $(boards), \
1420 $(foreach b, $(boards), \
1421 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1422 echo '')
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001423 @$(if $(board-dirs), \
1424 $(foreach b, $(board-dirs), \
1425 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1426 printf " %-16s - Show all of the above\\n" help-boards; \
1427 echo '')
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428
1429 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
Sam Ravnborg45d506b2006-08-08 21:35:14 +02001430 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001431 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
Cao jin9ba26a72017-06-06 17:07:53 +08001432 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)'
Dustin Kirkland701842e2006-05-23 15:57:23 -05001433 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
Ingo Molnaraf07ce32011-06-16 13:26:23 +02001434 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
Sam Ravnborg28bc20d2011-04-27 22:15:27 +02001435 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1436 @echo ' 1: warnings which may be relevant and do not occur too often'
1437 @echo ' 2: warnings which occur quite often but may still be relevant'
1438 @echo ' 3: more obscure warnings, can most likely be ignored'
Michal Mareka6de5532011-04-29 14:45:31 +02001439 @echo ' Multiple levels can be combined with W=12 or W=123'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001440 @echo ''
1441 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1442 @echo 'For further info see the ./README file'
1443
1444
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001445help-board-dirs := $(addprefix help-,$(board-dirs))
1446
1447help-boards: $(help-board-dirs)
1448
Michal Marekfbae4d52014-11-28 13:31:43 +01001449boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001450
1451$(help-board-dirs): help-%:
1452 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1453 @$(if $(boards-per-dir), \
1454 $(foreach b, $(boards-per-dir), \
1455 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1456 echo '')
1457
1458
Linus Torvalds1da177e2005-04-16 15:20:36 -07001459# Documentation targets
1460# ---------------------------------------------------------------------------
Mauro Carvalho Chehab18afab82017-07-17 18:46:35 -03001461DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs linkcheckdocs
Jani Nikula22cba312016-05-19 15:14:05 +03001462PHONY += $(DOC_TARGETS)
1463$(DOC_TARGETS): scripts_basic FORCE
Mauro Carvalho Chehabcb43fb52017-05-14 11:50:01 -03001464 $(Q)$(MAKE) $(build)=Documentation $@
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465
1466else # KBUILD_EXTMOD
1467
1468###
1469# External module support.
1470# When building external modules the kernel used as basis is considered
1471# read-only, and no consistency checks are made and the make
1472# system is not used on the basis kernel. If updates are required
1473# in the basis kernel ordinary make commands (without M=...) must
1474# be used.
1475#
1476# The following are the only valid targets when building external
1477# modules.
1478# make M=dir clean Delete all automatically generated files
1479# make M=dir modules Make all modules in specified dir
1480# make M=dir Same as 'make M=dir modules'
1481# make M=dir modules_install
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001482# Install the modules built in the module directory
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483# Assumes install directory is already created
1484
1485# We are always building modules
1486KBUILD_MODULES := 1
Paul Smith4f193362006-03-05 17:14:10 -05001487PHONY += crmodverdir
Linus Torvalds1da177e2005-04-16 15:20:36 -07001488crmodverdir:
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001489 $(cmd_crmodverdir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490
Paul Smith4f193362006-03-05 17:14:10 -05001491PHONY += $(objtree)/Module.symvers
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492$(objtree)/Module.symvers:
1493 @test -e $(objtree)/Module.symvers || ( \
1494 echo; \
1495 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1496 echo " is missing; modules will have no dependencies and modversions."; \
1497 echo )
1498
1499module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
Paul Smith4f193362006-03-05 17:14:10 -05001500PHONY += $(module-dirs) modules
Linus Torvalds1da177e2005-04-16 15:20:36 -07001501$(module-dirs): crmodverdir $(objtree)/Module.symvers
1502 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1503
1504modules: $(module-dirs)
Mike Frysingerfd54f502008-11-06 03:31:35 -05001505 @$(kecho) ' Building modules, stage 2.';
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001506 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
Linus Torvalds1da177e2005-04-16 15:20:36 -07001507
Paul Smith4f193362006-03-05 17:14:10 -05001508PHONY += modules_install
Sam Ravnborga67dc212006-01-28 23:51:57 +01001509modules_install: _emodinst_ _emodinst_post
Adrian Bunke6304662006-02-14 15:58:15 +01001510
Paul Smith4f193362006-03-05 17:14:10 -05001511install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1512PHONY += _emodinst_
Sam Ravnborga67dc212006-01-28 23:51:57 +01001513_emodinst_:
Sam Ravnborga67dc212006-01-28 23:51:57 +01001514 $(Q)mkdir -p $(MODLIB)/$(install-dir)
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001515 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516
Paul Smith4f193362006-03-05 17:14:10 -05001517PHONY += _emodinst_post
Sam Ravnborga67dc212006-01-28 23:51:57 +01001518_emodinst_post: _emodinst_
1519 $(call cmd,depmod)
1520
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1522
Paul Smith4f193362006-03-05 17:14:10 -05001523PHONY += $(clean-dirs) clean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001524$(clean-dirs):
1525 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1526
1527clean: rm-dirs := $(MODVERDIR)
Michal Marek88d7be02010-09-06 12:00:08 +02001528clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
Linus Torvalds1da177e2005-04-16 15:20:36 -07001529
Masahiro Yamadafe69b422016-03-13 09:39:55 +09001530PHONY += help
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531help:
1532 @echo ' Building external modules.'
1533 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1534 @echo ''
1535 @echo ' modules - default target, build the module(s)'
1536 @echo ' modules_install - install the module'
1537 @echo ' clean - remove generated files in module directory only'
1538 @echo ''
Sam Ravnborg06300b22006-01-25 07:13:18 +01001539
1540# Dummies...
Paul Smith4f193362006-03-05 17:14:10 -05001541PHONY += prepare scripts
Sam Ravnborg06300b22006-01-25 07:13:18 +01001542prepare: ;
1543scripts: ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001544endif # KBUILD_EXTMOD
1545
Michal Marek88d7be02010-09-06 12:00:08 +02001546clean: $(clean-dirs)
1547 $(call cmd,rmdirs)
1548 $(call cmd,rmfiles)
Kevin Cernekee43f67c92011-05-10 15:47:16 -07001549 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
Michal Marek88d7be02010-09-06 12:00:08 +02001550 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
David Howellsaddbcdb2012-09-26 10:09:50 +01001551 -o -name '*.ko.*' \
Andi Kleen866ced92014-07-30 20:50:18 +02001552 -o -name '*.dwo' \
Rasmus Villemoesd523b252015-08-20 11:53:29 +02001553 -o -name '*.su' \
Michal Marek88d7be02010-09-06 12:00:08 +02001554 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1555 -o -name '*.symtypes' -o -name 'modules.order' \
1556 -o -name modules.builtin -o -name '.tmp_*.o.*' \
Emese Revfy6b90bd42016-05-24 00:09:38 +02001557 -o -name '*.c.[012]*.*' \
Vinícius Tinti433db3e2017-04-24 13:04:58 -07001558 -o -name '*.ll' \
Michal Marek88d7be02010-09-06 12:00:08 +02001559 -o -name '*.gcno' \) -type f -print | xargs rm -f
1560
Linus Torvalds1da177e2005-04-16 15:20:36 -07001561# Generate tags for editors
1562# ---------------------------------------------------------------------------
Sam Ravnborga680eed2008-12-03 22:24:13 +01001563quiet_cmd_tags = GEN $@
1564 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565
Jianbin Kangf4ed1002011-01-14 20:07:05 +08001566tags TAGS cscope gtags: FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001567 $(call cmd,tags)
1568
Linus Torvalds1da177e2005-04-16 15:20:36 -07001569# Scripts to check various things for consistency
1570# ---------------------------------------------------------------------------
1571
Peter Foley279f3dd2011-04-26 17:15:01 -04001572PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1573
Linus Torvalds1da177e2005-04-16 15:20:36 -07001574includecheck:
Peter Foley436f8762011-04-26 17:18:29 -04001575 find $(srctree)/* $(RCS_FIND_IGNORE) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001576 -name '*.[hcS]' -type f -print | sort \
Geert Uytterhoeven80007432007-11-05 11:51:44 +01001577 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
Linus Torvalds1da177e2005-04-16 15:20:36 -07001578
1579versioncheck:
Peter Foley2ee2d292011-04-26 17:19:28 -04001580 find $(srctree)/* $(RCS_FIND_IGNORE) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001581 -name '*.[hcS]' -type f -print | sort \
Geert Uytterhoeven80007432007-11-05 11:51:44 +01001582 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
Linus Torvalds1da177e2005-04-16 15:20:36 -07001583
Nicolas Palix74425ee2010-06-06 17:15:01 +02001584coccicheck:
1585 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1586
Linus Torvalds1da177e2005-04-16 15:20:36 -07001587namespacecheck:
1588 $(PERL) $(srctree)/scripts/namespace.pl
1589
Adrian Bunk295ac052007-08-24 23:04:56 +02001590export_report:
1591 $(PERL) $(srctree)/scripts/export_report.pl
1592
Linus Torvalds1da177e2005-04-16 15:20:36 -07001593endif #ifeq ($(config-targets),1)
1594endif #ifeq ($(mixed-targets),1)
1595
Mike Marciniszync398ff02013-06-24 08:48:37 -04001596PHONY += checkstack kernelrelease kernelversion image_name
Jeff Dikee3ccf6e2006-09-27 01:50:37 -07001597
Jeff Dike011e3a92006-12-13 00:34:12 -08001598# UML needs a little special treatment here. It wants to use the host
1599# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1600# else wants $(ARCH), including people doing cross-builds, which means
1601# that $(SUBARCH) doesn't work here.
1602ifeq ($(ARCH), um)
1603CHECKSTACK_ARCH := $(SUBARCH)
1604else
1605CHECKSTACK_ARCH := $(ARCH)
1606endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001607checkstack:
1608 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
Jeff Dike011e3a92006-12-13 00:34:12 -08001609 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001610
Amerigo Wang7b8ea532010-08-20 05:36:06 -04001611kernelrelease:
1612 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
Amerigo Wang01ab1782010-06-28 10:45:21 +08001613
Sam Ravnborgcb584552006-01-09 21:20:34 +01001614kernelversion:
Sam Ravnborg2244cbd2006-01-16 12:12:12 +01001615 @echo $(KERNELVERSION)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001616
Mike Marciniszync398ff02013-06-24 08:48:37 -04001617image_name:
1618 @echo $(KBUILD_IMAGE)
1619
Borislav Petkovea01fa92012-04-11 18:36:18 +02001620# Clear a bunch of variables before executing the submake
1621tools/: FORCE
David Howellsbf351822012-11-05 21:02:08 +00001622 $(Q)mkdir -p $(objtree)/tools
Masahiro Yamada8e9b4662017-08-20 15:04:11 +09001623 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
Borislav Petkovea01fa92012-04-11 18:36:18 +02001624
1625tools/%: FORCE
David Howellsbf351822012-11-05 21:02:08 +00001626 $(Q)mkdir -p $(objtree)/tools
Masahiro Yamada8e9b4662017-08-20 15:04:11 +09001627 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
Borislav Petkovea01fa92012-04-11 18:36:18 +02001628
Sam Ravnborg06300b22006-01-25 07:13:18 +01001629# Single targets
1630# ---------------------------------------------------------------------------
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001631# Single targets are compatible with:
Robert P. J. Daye1b85132008-02-03 15:14:02 +02001632# - build with mixed source and output
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001633# - build with separate output dir 'make O=...'
1634# - external modules
1635#
1636# target-dir => where to store outputfile
1637# build-dir => directory in kernel source tree to use
Sam Ravnborg06300b22006-01-25 07:13:18 +01001638
Sam Ravnborg06300b22006-01-25 07:13:18 +01001639ifeq ($(KBUILD_EXTMOD),)
Sam Ravnborgaa360872006-04-06 08:25:31 +02001640 build-dir = $(patsubst %/,%,$(dir $@))
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001641 target-dir = $(dir $@)
Sam Ravnborg06300b22006-01-25 07:13:18 +01001642else
1643 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001644 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1645 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
Sam Ravnborg06300b22006-01-25 07:13:18 +01001646endif
1647
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001648%.s: %.c prepare scripts FORCE
1649 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1650%.i: %.c prepare scripts FORCE
1651 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1652%.o: %.c prepare scripts FORCE
1653 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1654%.lst: %.c prepare scripts FORCE
1655 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1656%.s: %.S prepare scripts FORCE
1657 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1658%.o: %.S prepare scripts FORCE
1659 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
Andreas Gruenbacher15fde672006-05-09 20:37:30 +02001660%.symtypes: %.c prepare scripts FORCE
1661 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
Vinícius Tinti433db3e2017-04-24 13:04:58 -07001662%.ll: %.c prepare scripts FORCE
1663 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001664
1665# Modules
Sam Ravnborg31110eb2008-12-13 23:00:45 +01001666/: prepare scripts FORCE
1667 $(cmd_crmodverdir)
1668 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1669 $(build)=$(build-dir)
Peter Foley8e2faea2014-09-25 11:23:58 -07001670# Make sure the latest headers are built for Documentation
Arnd Bergmannddea05f2016-07-04 16:39:35 +02001671Documentation/ samples/: headers_install
Sam Ravnborg31110eb2008-12-13 23:00:45 +01001672%/: prepare scripts FORCE
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001673 $(cmd_crmodverdir)
Sam Ravnborg06300b22006-01-25 07:13:18 +01001674 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001675 $(build)=$(build-dir)
1676%.ko: prepare scripts FORCE
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001677 $(cmd_crmodverdir)
Sam Ravnborg06300b22006-01-25 07:13:18 +01001678 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001679 $(build)=$(build-dir) $(@:.ko=.o)
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001680 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
Sam Ravnborg06300b22006-01-25 07:13:18 +01001681
Masahiro Yamada38385f82014-04-28 16:26:18 +09001682# FIXME Should go into a make.lib or something
Linus Torvalds1da177e2005-04-16 15:20:36 -07001683# ===========================================================================
1684
1685quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1686 cmd_rmdirs = rm -rf $(rm-dirs)
1687
1688quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1689 cmd_rmfiles = rm -f $(rm-files)
1690
Uwe Kleine-Königbc3c26f2008-04-21 22:53:56 +00001691# Run depmod only if we have System.map and depmod is executable
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001692quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
Michal Marek569658d2011-06-15 22:15:47 +02001693 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
Rusty Russellb92021b2013-03-15 15:04:17 +10301694 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001695
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001696# Create temporary dir for module support files
Sam Ravnborgab19f872007-10-22 11:23:07 +02001697# clean it up only when building all modules
1698cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1699 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001700
Linus Torvalds1da177e2005-04-16 15:20:36 -07001701# read all saved command lines
1702
1703targets := $(wildcard $(sort $(targets)))
1704cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1705
1706ifneq ($(cmd_files),)
1707 $(cmd_files): ; # Do not try to update included dependency files
1708 include $(cmd_files)
1709endif
1710
Linus Torvalds1da177e2005-04-16 15:20:36 -07001711endif # skip-makefile
1712
Paul Smith4f193362006-03-05 17:14:10 -05001713PHONY += FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001714FORCE:
Paul Smith4f193362006-03-05 17:14:10 -05001715
Paul Smith4f193362006-03-05 17:14:10 -05001716# Declare the contents of the .PHONY variable as phony. We keep that
Kirill Smelkovfe8d0a42009-04-09 15:34:34 +04001717# information in a variable so we can use it in if_changed and friends.
Paul Smith4f193362006-03-05 17:14:10 -05001718.PHONY: $(PHONY)