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Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001# SPDX-License-Identifier: GPL-2.0
Linus Torvaldsc517d832015-02-22 18:21:14 -08002VERSION = 4
Linus Torvalds2bd6bf02017-09-16 15:47:51 -07003PATCHLEVEL = 14
Linus Torvalds55922c92011-05-29 17:43:36 -07004SUBLEVEL = 0
Linus Torvaldsbebc6082017-11-12 10:46:13 -08005EXTRAVERSION =
Linus Torvalds566cf872017-01-29 14:25:17 -08006NAME = Fearless Coyote
Linus Torvalds1da177e2005-04-16 15:20:36 -07007
8# *DOCUMENTATION*
9# To see a list of typical targets execute "make help"
10# More info can be located in ./README
11# Comments in this file are targeted only to the developer, do not
12# expect to learn how to build the kernel reading this file.
13
Masahiro Yamadaa436bb72015-03-27 20:43:36 +090014# o Do not use make's built-in rules and variables
15# (this increases performance and avoids hard-to-debug behaviour);
16# o Look for make include files relative to root of kernel src
17MAKEFLAGS += -rR --include-dir=$(CURDIR)
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
H. Peter Anvinc0513462009-12-17 06:56:11 -080019# Avoid funny character set dependencies
H. Peter Anvin06b5dc62009-12-17 15:51:37 -080020unexport LC_ALL
H. Peter Anvinc0513462009-12-17 06:56:11 -080021LC_COLLATE=C
22LC_NUMERIC=C
Michal Marek07105202010-01-08 12:25:37 +010023export LC_COLLATE LC_NUMERIC
H. Peter Anvinc0513462009-12-17 06:56:11 -080024
Borislav Petkovab7474e2013-11-11 15:27:43 +010025# Avoid interference with shell env settings
26unexport GREP_OPTIONS
27
Linus Torvalds1da177e2005-04-16 15:20:36 -070028# We are using a recursive build, so we need to do a little thinking
29# to get the ordering right.
30#
31# Most importantly: sub-Makefiles should only ever modify files in
32# their own directory. If in some directory we have a dependency on
33# a file in another dir (which doesn't happen often, but it's often
34# unavoidable when linking the built-in.o targets which finally
35# turn into vmlinux), we will call a sub make in that other dir, and
36# after that we are sure that everything which is in that other dir
37# is now up to date.
38#
39# The only cases where we need to modify files which have global
40# effects are thus separated out and done before the recursive
41# descending is started. They are now explicitly listed as the
42# prepare rule.
43
Michal Marek066b7ed2014-07-04 14:29:30 +020044# Beautify output
45# ---------------------------------------------------------------------------
46#
47# Normally, we echo the whole command before executing it. By making
48# that echo $($(quiet)$(cmd)), we now have the possibility to set
49# $(quiet) to choose other forms of output instead, e.g.
50#
51# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
52# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
53#
54# If $(quiet) is empty, the whole command will be printed.
55# If it is set to "quiet_", only the short version will be printed.
56# If it is set to "silent_", nothing will be printed at all, since
57# the variable $(silent_cmd_cc_o_c) doesn't exist.
58#
59# A simple variant is to prefix commands with $(Q) - that's useful
60# for commands that shall be hidden in non-verbose mode.
61#
62# $(Q)ln $@ :<
63#
64# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
65# If KBUILD_VERBOSE equals 1 then the above command is displayed.
66#
Linus Torvalds1da177e2005-04-16 15:20:36 -070067# To put more focus on warnings, be less verbose as default
68# Use 'make V=1' to see the full commands
69
Cheng Renquanb8b06182009-05-26 16:03:07 +080070ifeq ("$(origin V)", "command line")
71 KBUILD_VERBOSE = $(V)
Linus Torvalds1da177e2005-04-16 15:20:36 -070072endif
73ifndef KBUILD_VERBOSE
74 KBUILD_VERBOSE = 0
75endif
76
Michal Marek066b7ed2014-07-04 14:29:30 +020077ifeq ($(KBUILD_VERBOSE),1)
78 quiet =
79 Q =
80else
81 quiet=quiet_
82 Q = @
83endif
84
85# If the user is running make -s (silent mode), suppress echoing of
86# commands
87
Masahiro Yamada6f0fa582017-05-19 20:42:30 +090088ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
Michal Marek066b7ed2014-07-04 14:29:30 +020089 quiet=silent_
Josh Poimboeufe572d082017-01-18 22:16:55 -060090 tools_silent=s
Michal Marek066b7ed2014-07-04 14:29:30 +020091endif
Michal Marek066b7ed2014-07-04 14:29:30 +020092
93export quiet Q KBUILD_VERBOSE
94
Linus Torvalds1da177e2005-04-16 15:20:36 -070095# kbuild supports saving output files in a separate directory.
96# To locate output files in a separate directory two syntaxes are supported.
97# In both cases the working directory must be the root of the kernel src.
98# 1) O=
99# Use "make O=dir/to/store/output/files/"
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200100#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101# 2) Set KBUILD_OUTPUT
102# Set the environment variable KBUILD_OUTPUT to point to the directory
103# where the output files shall be placed.
104# export KBUILD_OUTPUT=dir/to/store/output/files/
105# make
106#
107# The O= assignment takes precedence over the KBUILD_OUTPUT environment
108# variable.
109
Cao jinc4e6fff2017-06-30 10:45:43 +0800110# KBUILD_SRC is not intended to be used by the regular user (for now),
111# it is set on invocation of make with KBUILD_OUTPUT or O= specified.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112ifeq ($(KBUILD_SRC),)
113
114# OK, Make called in directory where kernel src resides
115# Do we want to locate output files in a separate directory?
Cheng Renquanb8b06182009-05-26 16:03:07 +0800116ifeq ("$(origin O)", "command line")
117 KBUILD_OUTPUT := $(O)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118endif
119
120# That's our default target when none is given on the command line
Paul Smith4f193362006-03-05 17:14:10 -0500121PHONY := _all
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122_all:
123
Sam Ravnborg1cacc9a2007-12-06 22:20:11 +0100124# Cancel implicit rules on top Makefile
125$(CURDIR)/Makefile Makefile: ;
126
Robert Jarzmik51193b72016-04-02 21:38:53 +0200127ifneq ($(words $(subst :, ,$(CURDIR))), 1)
128 $(error main directory cannot contain spaces nor colons)
129endif
130
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131ifneq ($(KBUILD_OUTPUT),)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132# check that the output directory actually exists
133saved-output := $(KBUILD_OUTPUT)
Masahiro Yamada028568d2017-10-02 17:07:28 +0900134KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
135 && /bin/pwd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136$(if $(KBUILD_OUTPUT),, \
Masahiro Yamada1c9e70a2014-03-31 16:41:36 +0900137 $(error failed to create output directory "$(saved-output)"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
Milton Miller0b357862007-09-21 18:09:02 -0500139PHONY += $(MAKECMDGOALS) sub-make
140
Sam Ravnborg1cacc9a2007-12-06 22:20:11 +0100141$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
Charles Keepax16f89092012-10-15 13:49:12 +0100142 @:
Milton Miller0b357862007-09-21 18:09:02 -0500143
Cao jinc4e6fff2017-06-30 10:45:43 +0800144# Invoke a second make in the output directory, passing relevant variables
Masahiro Yamada2e8d6962016-03-13 09:13:55 +0900145sub-make:
Masahiro Yamada745a2542014-09-09 20:02:23 +0900146 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
Masahiro Yamadaaa55c8e2014-09-09 20:02:24 +0900147 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
149# Leave processing to above invocation of make
150skip-makefile := 1
151endif # ifneq ($(KBUILD_OUTPUT),)
152endif # ifeq ($(KBUILD_SRC),)
153
154# We process the rest of the Makefile if this is the final invocation of make
155ifeq ($(skip-makefile),)
156
Masahiro Yamada7ff52572014-09-09 20:02:22 +0900157# Do not print "Entering directory ...",
158# but we want to display it when entering to the output directory
159# so that IDEs/editors are able to understand relative filenames.
160MAKEFLAGS += --no-print-directory
161
Masahiro Yamadaaa55c8e2014-09-09 20:02:24 +0900162# Call a source code checker (by default, "sparse") as part of the
163# C compilation.
164#
165# Use 'make C=1' to enable checking of only re-compiled files.
166# Use 'make C=2' to enable checking of *all* source files, regardless
167# of whether they are re-compiled or not.
168#
Cao jin036db112017-03-24 17:03:17 +0800169# See the file "Documentation/dev-tools/sparse.rst" for more details,
170# including where to get the "sparse" utility.
Masahiro Yamadaaa55c8e2014-09-09 20:02:24 +0900171
172ifeq ("$(origin C)", "command line")
173 KBUILD_CHECKSRC = $(C)
174endif
175ifndef KBUILD_CHECKSRC
176 KBUILD_CHECKSRC = 0
177endif
178
179# Use make M=dir to specify directory of external module to build
180# Old syntax make ... SUBDIRS=$PWD is still supported
181# Setting the environment variable KBUILD_EXTMOD take precedence
182ifdef SUBDIRS
183 KBUILD_EXTMOD ?= $(SUBDIRS)
184endif
185
186ifeq ("$(origin M)", "command line")
187 KBUILD_EXTMOD := $(M)
188endif
189
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190# If building an external module we do not care about the all: rule
191# but instead _all depend on modules
Paul Smith4f193362006-03-05 17:14:10 -0500192PHONY += all
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193ifeq ($(KBUILD_EXTMOD),)
194_all: all
195else
196_all: modules
197endif
198
Michal Marek9da07632014-04-25 23:25:18 +0200199ifeq ($(KBUILD_SRC),)
200 # building in the source tree
201 srctree := .
202else
203 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
204 # building in a subdirectory of the source tree
205 srctree := ..
206 else
207 srctree := $(KBUILD_SRC)
208 endif
209endif
Michal Marek7e1c0472014-04-25 17:29:45 +0200210objtree := .
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211src := $(srctree)
212obj := $(objtree)
213
Mattia Dongili0f558c32006-02-19 13:50:37 +0100214VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
Amerigo Wang11294232009-06-19 03:40:26 -0400216export srctree objtree VPATH
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218# SUBARCH tells the usermode build what the underlying arch is. That is set
219# first, and if a usermode build is happening, the "ARCH=um" on the command
220# line overrides the setting of ARCH below. If a native build is happening,
Masahiro Yamada38385f82014-04-28 16:26:18 +0900221# then ARCH is assigned, getting whatever value it gets normally, and
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222# SUBARCH is subsequently ignored.
223
David Woodhouseffee0de2012-12-20 21:51:55 +0000224SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
225 -e s/sun4u/sparc64/ \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 -e s/arm.*/arm/ -e s/sa110/arm/ \
Linus Torvalds39990b52005-11-11 14:27:32 -0800227 -e s/s390x/s390/ -e s/parisc64/parisc/ \
Paul Mundt236b1952007-11-02 12:22:47 +0900228 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
Palmer Dabbeltfbe934d2017-07-10 18:08:08 -0700229 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \
230 -e s/riscv.*/riscv/)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231
232# Cross compiling and selecting different set of gcc/bin-utils
233# ---------------------------------------------------------------------------
234#
235# When performing cross compilation for other architectures ARCH shall be set
236# to the target architecture. (See arch/* for the possibilities).
237# ARCH can be set during invocation of make:
238# make ARCH=ia64
239# Another way is to have ARCH set in the environment.
240# The default ARCH is the host where make is executed.
241
242# CROSS_COMPILE specify the prefix used for all executables used
243# during compilation. Only gcc and related bin-utils executables
244# are prefixed with $(CROSS_COMPILE).
245# CROSS_COMPILE can be set on the command line
246# make CROSS_COMPILE=ia64-linux-
247# Alternatively CROSS_COMPILE can be set in the environment.
Roland McGrath84336462009-12-21 16:24:06 -0800248# A third alternative is to store a setting in .config so that plain
249# "make" in the configured kernel build directory always uses that.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250# Default value for CROSS_COMPILE is not to prefix executables
251# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
Sam Ravnborg2331d1a2009-10-11 23:22:58 +0200252ARCH ?= $(SUBARCH)
Roland McGrath84336462009-12-21 16:24:06 -0800253CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254
255# Architecture as present in compile.h
Thomas Gleixner6752ed92007-10-11 11:11:36 +0200256UTS_MACHINE := $(ARCH)
257SRCARCH := $(ARCH)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258
Sam Ravnborgd746d642007-11-12 20:14:19 +0100259# Additional ARCH settings for x86
260ifeq ($(ARCH),i386)
261 SRCARCH := x86
262endif
263ifeq ($(ARCH),x86_64)
264 SRCARCH := x86
265endif
Sam Ravnborg74b469f2007-10-25 19:42:04 +0200266
Sam Ravnborg5e538792008-12-02 23:17:12 -0800267# Additional ARCH settings for sparc
Namhyung Kime69f58c2010-10-25 05:48:23 +0000268ifeq ($(ARCH),sparc32)
269 SRCARCH := sparc
270endif
Sam Ravnborga439fe52008-07-27 23:00:59 +0200271ifeq ($(ARCH),sparc64)
Sam Ravnborg5e538792008-12-02 23:17:12 -0800272 SRCARCH := sparc
Sam Ravnborga439fe52008-07-27 23:00:59 +0200273endif
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +0200274
Paul Mundt3cc000b2009-04-11 08:39:27 +0900275# Additional ARCH settings for sh
276ifeq ($(ARCH),sh64)
277 SRCARCH := sh
278endif
279
Chris Metcalf18aecc22011-05-04 14:38:26 -0400280# Additional ARCH settings for tile
Chris Metcalf6738d322011-05-25 15:24:00 -0400281ifeq ($(ARCH),tilepro)
282 SRCARCH := tile
283endif
Chris Metcalf18aecc22011-05-04 14:38:26 -0400284ifeq ($(ARCH),tilegx)
285 SRCARCH := tile
286endif
287
Sam Ravnborg5e538792008-12-02 23:17:12 -0800288# Where to locate arch specific headers
289hdr-arch := $(SRCARCH)
290
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700291KCONFIG_CONFIG ?= .config
Ben Gardiner41263fc2010-12-14 11:39:44 -0500292export KCONFIG_CONFIG
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700293
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294# SHELL used by kbuild
295CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
296 else if [ -x /bin/bash ]; then echo /bin/bash; \
297 else echo sh; fi ; fi)
298
Uwe Kleine-Königd7f14c62017-07-09 20:02:36 +0200299HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS)
300HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS)
301HOST_LFS_LIBS := $(shell getconf LFS_LIBS)
302
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200303HOSTCC = gcc
304HOSTCXX = g++
Uwe Kleine-Königd7f14c62017-07-09 20:02:36 +0200305HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
306 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS)
307HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)
308HOSTLDFLAGS := $(HOST_LFS_LDFLAGS)
309HOST_LOADLIBES := $(HOST_LFS_LIBS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310
Behan Webster61163ef2013-09-03 22:27:23 -0400311ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
312HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
313 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
314endif
315
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200316# Decide whether to build built-in, modular, or both.
317# Normally, just do built-in.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318
319KBUILD_MODULES :=
320KBUILD_BUILTIN := 1
321
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +0900322# If we have only "make modules", don't compile built-in objects.
323# When we're building modules with modversions, we need to consider
324# the built-in objects during the descend as well, in order to
325# make sure the checksums are up to date before we record them.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
327ifeq ($(MAKECMDGOALS),modules)
328 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
329endif
330
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +0900331# If we have "make <whatever> modules", compile modules
332# in addition to whatever we do anyway.
333# Just "make" or "make all" shall build modules as well
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334
335ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
336 KBUILD_MODULES := 1
337endif
338
339ifeq ($(MAKECMDGOALS),)
340 KBUILD_MODULES := 1
341endif
342
Sam Ravnborge579d352005-07-27 08:10:10 +0200343export KBUILD_MODULES KBUILD_BUILTIN
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
345
Sam Ravnborg1cacc9a2007-12-06 22:20:11 +0100346# We need some generic definitions (do not try to remake the file).
Masahiro Yamadaa436bb72015-03-27 20:43:36 +0900347scripts/Kbuild.include: ;
348include scripts/Kbuild.include
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349
350# Make variables (CC, etc...)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351AS = $(CROSS_COMPILE)as
352LD = $(CROSS_COMPILE)ld
353CC = $(CROSS_COMPILE)gcc
354CPP = $(CC) -E
355AR = $(CROSS_COMPILE)ar
356NM = $(CROSS_COMPILE)nm
357STRIP = $(CROSS_COMPILE)strip
358OBJCOPY = $(CROSS_COMPILE)objcopy
359OBJDUMP = $(CROSS_COMPILE)objdump
360AWK = awk
361GENKSYMS = scripts/genksyms/genksyms
Sam Ravnborgcaa27b62009-07-20 21:37:11 +0200362INSTALLKERNEL := installkernel
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363DEPMOD = /sbin/depmod
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364PERL = perl
Masahiro Yamada011bf122014-07-18 13:40:11 +0900365PYTHON = python
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366CHECK = sparse
367
Hannes Eder80a7d1d2008-12-27 22:38:44 +0100368CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
369 -Wbitwise -Wno-return-void $(CF)
Michal Marekb36fad62016-06-07 11:57:02 +0200370NOSTDINC_FLAGS =
Sam Ravnborg65881692010-07-28 17:33:09 +0200371CFLAGS_MODULE =
372AFLAGS_MODULE =
373LDFLAGS_MODULE =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374CFLAGS_KERNEL =
375AFLAGS_KERNEL =
Michal Marekb36fad62016-06-07 11:57:02 +0200376LDFLAGS_vmlinux =
Arnd Bergmannb334e192017-01-13 16:40:01 +0100377CFLAGS_GCOV := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
Emese Revfy543c37c2016-05-24 00:11:37 +0200378CFLAGS_KCOV := $(call cc-option,-fsanitize-coverage=trace-pc,)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379
380
David Howellsabbf1592012-10-02 18:01:26 +0100381# Use USERINCLUDE when you must reference the UAPI directories only.
382USERINCLUDE := \
383 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
Arnd Bergmann3308b282016-06-15 17:45:45 +0200384 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
David Howellsabbf1592012-10-02 18:01:26 +0100385 -I$(srctree)/include/uapi \
Arnd Bergmann3308b282016-06-15 17:45:45 +0200386 -I$(objtree)/include/generated/uapi \
David Howellsabbf1592012-10-02 18:01:26 +0100387 -include $(srctree)/include/linux/kconfig.h
388
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389# Use LINUXINCLUDE when you must reference the include/ directory.
390# Needed to be compatible with the O= option
David Howellsabbf1592012-10-02 18:01:26 +0100391LINUXINCLUDE := \
392 -I$(srctree)/arch/$(hdr-arch)/include \
Arnd Bergmann3308b282016-06-15 17:45:45 +0200393 -I$(objtree)/arch/$(hdr-arch)/include/generated \
David Howellsabbf1592012-10-02 18:01:26 +0100394 $(if $(KBUILD_SRC), -I$(srctree)/include) \
Masahiro Yamadaf8224f72017-06-06 16:15:28 +0900395 -I$(objtree)/include \
396 $(USERINCLUDE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397
Sam Ravnborgd8672b42008-11-21 21:50:02 +0100398KBUILD_CPPFLAGS := -D__KERNEL__
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200400KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
Arnd Bergmann8c970232017-07-26 15:36:23 +0200401 -fno-strict-aliasing -fno-common -fshort-wchar \
Floris Kraaka8735822009-06-15 08:54:02 +0300402 -Werror-implicit-function-declaration \
Kirill A. Shutemov51b97e32014-10-20 12:23:12 +0300403 -Wno-format-security \
Borislav Petkovc6a38552016-11-14 19:41:31 +0100404 -std=gnu89 $(call cc-option,-fno-PIE)
405
Geert Uytterhoevena1c48bb2014-05-27 09:54:12 +0200406
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200407KBUILD_AFLAGS_KERNEL :=
408KBUILD_CFLAGS_KERNEL :=
Borislav Petkovc6a38552016-11-14 19:41:31 +0100409KBUILD_AFLAGS := -D__ASSEMBLY__ $(call cc-option,-fno-PIE)
Sam Ravnborg65881692010-07-28 17:33:09 +0200410KBUILD_AFLAGS_MODULE := -DMODULE
411KBUILD_CFLAGS_MODULE := -DMODULE
412KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700414# Read KERNELRELEASE from include/config/kernel.release (if it exists)
415KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
Michal Marekcacd54e2011-05-30 13:36:07 +0200416KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
Sam Ravnborgcb584552006-01-09 21:20:34 +0100417
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200418export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
Sam Ravnborg80ef88d2007-11-17 15:37:31 +0100419export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
Uwe Kleine-Königd7f14c62017-07-09 20:02:36 +0200420export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
Masahiro Yamada011bf122014-07-18 13:40:11 +0900421export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200422export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423
Sam Ravnborg06c50402007-10-15 22:17:25 +0200424export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
Dmitry Vyukov5c9a8752016-03-22 14:27:30 -0700425export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
Sam Ravnborg222d3942007-10-15 21:59:31 +0200426export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
Sam Ravnborg65881692010-07-28 17:33:09 +0200427export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200428export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
Michal Marek40df7592011-04-20 13:45:30 +0200429export KBUILD_ARFLAGS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430
431# When compiling out-of-tree modules, put MODVERDIR in the module
432# tree rather than in the kernel tree. The kernel tree might
433# even be read-only.
434export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
435
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436# Files to ignore in find ... statements
437
Prarit Bhargavaae63b2d2014-02-06 07:51:42 -0500438export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
439 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
440 -prune -o
Jesper Juhl450c6072012-02-16 22:49:15 +0100441export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
442 --exclude CVS --exclude .pc --exclude .hg --exclude .git
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443
444# ===========================================================================
445# Rules shared between *config targets and build targets
446
Cao jin312a3d02017-08-02 10:31:06 +0800447# Basic helpers built in scripts/basic/
Paul Smith4f193362006-03-05 17:14:10 -0500448PHONY += scripts_basic
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449scripts_basic:
450 $(Q)$(MAKE) $(build)=scripts/basic
Steven Rostedt638adb02009-11-17 10:48:25 -0500451 $(Q)rm -f .tmp_quiet_recordmcount
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452
Jan Beulichcd05e6b2005-09-06 11:47:04 +0200453# To avoid any implicit rule to kick in, define an empty command.
454scripts/basic/%: scripts_basic ;
455
Paul Smith4f193362006-03-05 17:14:10 -0500456PHONY += outputmakefile
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200457# outputmakefile generates a Makefile in the output directory, if using a
458# separate output directory. This allows convenient use of make in the
459# output directory.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460outputmakefile:
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200461ifneq ($(KBUILD_SRC),)
Andi Kleen92979992009-01-10 04:56:13 +0100462 $(Q)ln -fsn $(srctree) source
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200463 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
464 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
465endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466
Sam Ravnborgd8ecc5c2011-04-27 22:29:49 +0200467# Support for using generic headers in asm-generic
Masahiro Yamadaa9d9a402017-07-10 03:32:59 +0900468PHONY += asm-generic uapi-asm-generic
469asm-generic: uapi-asm-generic
Sam Ravnborgd8ecc5c2011-04-27 22:29:49 +0200470 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
Catalin Marinas3c5994c2012-10-17 12:25:44 +0100471 src=asm obj=arch/$(SRCARCH)/include/generated/asm
Masahiro Yamadaa9d9a402017-07-10 03:32:59 +0900472uapi-asm-generic:
Catalin Marinas3c5994c2012-10-17 12:25:44 +0100473 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
474 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
Sam Ravnborgd8ecc5c2011-04-27 22:29:49 +0200475
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476# To make sure we do not include .config for any of the *config targets
477# catch them early, and hand them over to scripts/kconfig/Makefile
478# It is allowed to specify more targets when calling make, including
479# mixing *config targets and build targets.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200480# For example 'make oldconfig all'.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481# Detect when mixed targets is specified, and make a second invocation
482# of make so .config is not included in this case either (for *config).
483
David Howells10b63952012-10-02 18:01:57 +0100484version_h := include/generated/uapi/linux/version.h
Michal Marek223c24a2014-11-27 16:13:17 +0100485old_version_h := include/linux/version.h
David Howellsd183e6f2012-10-02 18:01:56 +0100486
Roman Zippel3eb3c742007-01-10 14:45:28 +0100487no-dot-config-targets := clean mrproper distclean \
Michal Marekfbae4d52014-11-28 13:31:43 +0100488 cscope gtags TAGS tags help% %docs check% coccicheck \
David Howellsd183e6f2012-10-02 18:01:56 +0100489 $(version_h) headers_% archheaders archscripts \
Linus Torvalds4aed2fd2010-08-06 09:30:52 -0700490 kernelversion %src-pkg
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491
492config-targets := 0
493mixed-targets := 0
494dot-config := 1
495
496ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
497 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
498 dot-config := 0
499 endif
500endif
501
502ifeq ($(KBUILD_EXTMOD),)
503 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
504 config-targets := 1
Masahiro Yamadad0d38cd2014-12-11 19:12:34 +0900505 ifneq ($(words $(MAKECMDGOALS)),1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 mixed-targets := 1
507 endif
508 endif
509endif
Cao jin312a3d02017-08-02 10:31:06 +0800510# install and modules_install need also be processed one by one
Michal Mareka85a41e2015-12-10 15:53:06 +0100511ifneq ($(filter install,$(MAKECMDGOALS)),)
512 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
513 mixed-targets := 1
514 endif
515endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516
517ifeq ($(mixed-targets),1)
518# ===========================================================================
519# We're called with mixed targets (*config and build targets).
520# Handle them one by one.
521
Masahiro Yamada9319f452014-04-09 15:51:35 +0900522PHONY += $(MAKECMDGOALS) __build_one_by_one
523
524$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
525 @:
526
527__build_one_by_one:
528 $(Q)set -e; \
529 for i in $(MAKECMDGOALS); do \
530 $(MAKE) -f $(srctree)/Makefile $$i; \
531 done
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532
533else
534ifeq ($(config-targets),1)
535# ===========================================================================
536# *config targets only - make sure prerequisites are updated, and descend
537# in scripts/kconfig to make the *config target
538
539# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
540# KBUILD_DEFCONFIG may point out an alternative default configuration
541# used for 'make defconfig'
Masahiro Yamadaa436bb72015-03-27 20:43:36 +0900542include arch/$(SRCARCH)/Makefile
Al Viro61bee202008-08-25 04:51:27 -0400543export KBUILD_DEFCONFIG KBUILD_KCONFIG
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544
Sam Ravnborg31110eb2008-12-13 23:00:45 +0100545config: scripts_basic outputmakefile FORCE
Sam Ravnborg31110eb2008-12-13 23:00:45 +0100546 $(Q)$(MAKE) $(build)=scripts/kconfig $@
547
548%config: scripts_basic outputmakefile FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 $(Q)$(MAKE) $(build)=scripts/kconfig $@
550
551else
552# ===========================================================================
553# Build targets only - this includes vmlinux, arch specific targets, clean
554# targets and others. In general all targets except *config targets.
555
556ifeq ($(KBUILD_EXTMOD),)
557# Additional helpers built in scripts/
558# Carefully list dependencies so we do not try to build scripts twice
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200559# in parallel
Paul Smith4f193362006-03-05 17:14:10 -0500560PHONY += scripts
Andreas Schwaba54292f2013-04-09 19:57:00 +0200561scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
Emese Revfy6b90bd42016-05-24 00:09:38 +0200562 asm-generic gcc-plugins
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 $(Q)$(MAKE) $(build)=$(@)
564
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565# Objects we will link into vmlinux / subdirs we need to visit
566init-y := init/
Markus Trippelsdorfdf85b2d2017-09-16 11:01:16 +0200567drivers-y := drivers/ sound/ firmware/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568net-y := net/
569libs-y := lib/
570core-y := usr/
Feng Wu37d9fe42015-09-22 16:47:29 +0800571virt-y := virt/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572endif # KBUILD_EXTMOD
573
574ifeq ($(dot-config),1)
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200575# Read in config
576-include include/config/auto.conf
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200578ifeq ($(KBUILD_EXTMOD),)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579# Read in dependencies to all Kconfig* files, make sure to run
580# oldconfig if changes are detected.
Roman Zippelc955cca2006-06-08 22:12:39 -0700581-include include/config/auto.conf.cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583# To avoid any implicit rule to kick in, define an empty command
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700584$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585
Roman Zippelc955cca2006-06-08 22:12:39 -0700586# If .config is newer than include/config/auto.conf, someone tinkered
Sam Ravnborg752625c2005-12-26 23:34:03 +0100587# with it and forgot to run make oldconfig.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200588# if auto.conf.cmd is missing then we are probably in a cleaned tree so
Sam Ravnborg752625c2005-12-26 23:34:03 +0100589# we execute the config step to be sure to catch updated Kconfig files
Michal Marekbc081dd2009-12-07 16:38:33 +0100590include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
592else
Sam Ravnborg264a2682009-10-18 00:49:24 +0200593# external modules needs include/generated/autoconf.h and include/config/auto.conf
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200594# but do not care if they are up-to-date. Use auto.conf to trigger the test
595PHONY += include/config/auto.conf
596
597include/config/auto.conf:
Sam Ravnborg264a2682009-10-18 00:49:24 +0200598 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
Michal Marek5369f552012-07-07 23:04:40 +0200599 echo >&2; \
600 echo >&2 " ERROR: Kernel configuration is invalid."; \
601 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
602 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
603 echo >&2 ; \
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200604 /bin/false)
605
606endif # KBUILD_EXTMOD
Roman Zippelc955cca2006-06-08 22:12:39 -0700607
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608else
609# Dummy target needed, because used as prerequisite
Roman Zippelc955cca2006-06-08 22:12:39 -0700610include/config/auto.conf: ;
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200611endif # $(dot-config)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612
Nicolas Pitre86556392016-12-02 15:11:50 -0500613# For the kernel to actually contain only the needed exported symbols,
614# we have to build modules as well to determine what those symbols are.
615# (this can be evaluated only once include/config/auto.conf has been included)
616ifdef CONFIG_TRIM_UNUSED_KSYMS
617 KBUILD_MODULES := 1
618endif
619
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620# The all: target is the default when no target is given on the
621# command line.
622# This allow a user to issue only 'make' to build a kernel including modules
Michal Marekc8447162010-06-03 10:54:58 +0200623# Defaults to vmlinux, but the arch makefile usually adds further targets
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624all: vmlinux
625
Michal Marek6dd3f132015-07-16 18:23:53 +0200626# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
627# values of the respective KBUILD_* variables
628ARCH_CPPFLAGS :=
629ARCH_AFLAGS :=
630ARCH_CFLAGS :=
Masahiro Yamadaa436bb72015-03-27 20:43:36 +0900631include arch/$(SRCARCH)/Makefile
Geert Uytterhoevena1c48bb2014-05-27 09:54:12 +0200632
633KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
Linus Torvaldsef6000b2016-10-12 10:23:41 -0700634KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
Linus Torvaldsbd664f62017-07-12 19:25:47 -0700635KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
636KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
637KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context)
Geert Uytterhoevena1c48bb2014-05-27 09:54:12 +0200638
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
Behan Webster6748cb32017-03-27 18:19:09 -0700640KBUILD_CFLAGS += $(call cc-option,-Oz,-Os)
641KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642else
Arnd Bergmann815eb712016-04-25 17:35:28 +0200643ifdef CONFIG_PROFILE_ALL_BRANCHES
Arnd Bergmanna76bcf52016-11-10 17:44:44 +0100644KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,)
Arnd Bergmann815eb712016-04-25 17:35:28 +0200645else
646KBUILD_CFLAGS += -O2
647endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648endif
649
Arnd Bergmanna76bcf52016-11-10 17:44:44 +0100650KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
651 $(call cc-disable-warning,maybe-uninitialized,))
652
Jiri Kosina69102312014-08-06 16:08:43 -0700653# Tell gcc to never replace conditional load with a non-conditional one
654KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
655
Gleb Fotengauer-Malinovskiy7292ae32017-03-20 20:15:53 +0300656# check for 'asm goto'
657ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
658 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
659 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
660endif
661
Emese Revfy6b90bd42016-05-24 00:09:38 +0200662include scripts/Makefile.gcc-plugins
663
Andi Kleen1873e872012-03-28 11:51:18 -0700664ifdef CONFIG_READABLE_ASM
665# Disable optimizations that make assembler listings hard to read.
666# reorder blocks reorders the control in the function
667# ipa clone creates specialized cloned functions
668# partial inlining inlines only parts of functions
669KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
670 $(call cc-option,-fno-ipa-cp-clone,) \
671 $(call cc-option,-fno-partial-inlining)
672endif
673
Mike Frysinger08f67462009-06-04 16:29:08 -0700674ifneq ($(CONFIG_FRAME_WARN),0)
Andi Kleen35bb5b12008-02-22 15:15:03 +0100675KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
676endif
677
Kees Cookc965b102016-07-26 15:21:17 -0700678# This selects the stack protector compiler flag. Testing it is delayed
679# until after .config has been reprocessed, in the prepare-compiler-check
680# target.
Kees Cook87796572013-12-19 11:35:59 -0800681ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
Kees Cook19952a92013-12-19 11:35:58 -0800682 stackp-flag := -fstack-protector
Kees Cookc965b102016-07-26 15:21:17 -0700683 stackp-name := REGULAR
Jan Beulich6c15b322014-02-25 15:01:48 -0800684else
685ifdef CONFIG_CC_STACKPROTECTOR_STRONG
Kees Cook87796572013-12-19 11:35:59 -0800686 stackp-flag := -fstack-protector-strong
Kees Cookc965b102016-07-26 15:21:17 -0700687 stackp-name := STRONG
Kees Cook19952a92013-12-19 11:35:58 -0800688else
689 # Force off for distro compilers that enable stack protector by default.
690 stackp-flag := $(call cc-option, -fno-stack-protector)
Tejun Heo5d707e92009-02-09 22:17:39 +0900691endif
Jan Beulich6c15b322014-02-25 15:01:48 -0800692endif
Kees Cookc965b102016-07-26 15:21:17 -0700693# Find arch-specific stack protector compiler sanity-checking script.
694ifdef CONFIG_CC_STACKPROTECTOR
Kees Cook228d96c2016-07-26 14:26:20 -0700695 stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
696 stackp-check := $(wildcard $(stackp-path))
Kees Cookc965b102016-07-26 15:21:17 -0700697endif
Kees Cook19952a92013-12-19 11:35:58 -0800698KBUILD_CFLAGS += $(stackp-flag)
Sam Ravnborge06b8b92008-02-13 22:43:28 +0100699
Michal Marek5631d9c2015-08-19 17:36:41 +0200700ifeq ($(cc-name),clang)
Behan Webster785f11a2017-04-21 11:20:01 -0700701ifneq ($(CROSS_COMPILE),)
David Linbb3f38c2017-10-20 14:09:13 -0700702CLANG_TARGET := --target=$(notdir $(CROSS_COMPILE:%-=%))
Behan Webster785f11a2017-04-21 11:20:01 -0700703GCC_TOOLCHAIN := $(realpath $(dir $(shell which $(LD)))/..)
704endif
705ifneq ($(GCC_TOOLCHAIN),)
David Linbb3f38c2017-10-20 14:09:13 -0700706CLANG_GCC_TC := --gcc-toolchain=$(GCC_TOOLCHAIN)
Behan Webster785f11a2017-04-21 11:20:01 -0700707endif
708KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
709KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
Behan Webster61163ef2013-09-03 22:27:23 -0400710KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
Behan Webster61163ef2013-09-03 22:27:23 -0400711KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
712KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
713KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
Matthias Kaehlckebfb38982017-04-21 14:39:30 -0700714KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
Behan Webster61163ef2013-09-03 22:27:23 -0400715# Quiet clang warning: comparison of unsigned expression < 0 is always false
716KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
717# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
718# source of a reference will be _MergedGlobals and not on of the whitelisted names.
719# See modpost pattern 2
720KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
Behan Webster26ea6bb2014-07-31 21:08:25 -0700721KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
Michael Davidsona37c45c2017-04-25 15:47:35 -0700722KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
723KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
Behan Webster61163ef2013-09-03 22:27:23 -0400724else
725
Arnd Bergmannc9c68372016-05-10 23:30:01 +0200726# These warnings generated too much noise in a regular build.
Seung-Woo Kim35288e32017-03-10 11:01:00 +0900727# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
Michal Marek8417da6f2011-05-02 12:51:15 +0200728KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
Arnd Bergmannc9c68372016-05-10 23:30:01 +0200729KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
Behan Webster61163ef2013-09-03 22:27:23 -0400730endif
Dave Jonesaf0e5d52011-04-21 17:28:13 -0400731
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732ifdef CONFIG_FRAME_POINTER
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200733KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734else
Rabin Vincent7e9501f2010-08-10 19:20:53 +0100735# Some targets (ARM with Thumb2, for example), can't be built with frame
736# pointers. For those, we don't have FUNCTION_TRACER automatically
737# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
738# incompatible with -fomit-frame-pointer with current GCC, so we don't use
739# -fomit-frame-pointer with FUNCTION_TRACER.
740ifndef CONFIG_FUNCTION_TRACER
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200741KBUILD_CFLAGS += -fomit-frame-pointer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742endif
Rabin Vincent7e9501f2010-08-10 19:20:53 +0100743endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744
Linus Torvalds2062afb2014-07-26 14:52:01 -0700745KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
746
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747ifdef CONFIG_DEBUG_INFO
Andi Kleen866ced92014-07-30 20:50:18 +0200748ifdef CONFIG_DEBUG_INFO_SPLIT
749KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
750else
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200751KBUILD_CFLAGS += -g
Andi Kleen866ced92014-07-30 20:50:18 +0200752endif
Behan Webster22883282014-02-14 15:19:17 -0800753KBUILD_AFLAGS += -Wa,-gdwarf-2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754endif
Andi Kleenbfaf2dd2014-07-30 20:50:19 +0200755ifdef CONFIG_DEBUG_INFO_DWARF4
756KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
757endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758
Andi Kleend6f4ceb2010-07-14 15:43:52 +0200759ifdef CONFIG_DEBUG_INFO_REDUCED
Andi Kleene82c4bb2013-02-07 13:58:40 -0800760KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
761 $(call cc-option,-fno-var-tracking)
Andi Kleend6f4ceb2010-07-14 15:43:52 +0200762endif
763
Steven Rostedt606576c2008-10-06 19:06:12 -0400764ifdef CONFIG_FUNCTION_TRACER
Heiko Carstensc0a80c02015-01-09 13:06:33 +0100765ifndef CC_FLAGS_FTRACE
766CC_FLAGS_FTRACE := -pg
767endif
768export CC_FLAGS_FTRACE
Steven Rostedta2546fa2011-02-09 13:15:59 -0500769ifdef CONFIG_HAVE_FENTRY
770CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
771endif
Heiko Carstensc0a80c02015-01-09 13:06:33 +0100772KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
Steven Rostedta2546fa2011-02-09 13:15:59 -0500773KBUILD_AFLAGS += $(CC_USING_FENTRY)
Steven Rostedt72441cb2010-10-13 17:12:30 -0400774ifdef CONFIG_DYNAMIC_FTRACE
Steven Rostedtcf4db252010-10-14 23:32:44 -0400775 ifdef CONFIG_HAVE_C_RECORDMCOUNT
Steven Rostedt72441cb2010-10-13 17:12:30 -0400776 BUILD_C_RECORDMCOUNT := y
777 export BUILD_C_RECORDMCOUNT
778 endif
779endif
Arnaldo Carvalho de Melo16444a82008-05-12 21:20:42 +0200780endif
781
Sam Ravnborg91341d42008-01-21 21:31:44 +0100782# We trigger additional mismatches with less inlining
783ifdef CONFIG_DEBUG_SECTION_MISMATCH
784KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
785endif
786
Masahiro Yamada90ad4052017-04-14 15:17:26 +0900787ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
788KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,)
789KBUILD_CFLAGS += $(call cc-option,-fdata-sections,)
790endif
791
Sam Ravnborge8e69932005-04-30 16:51:42 -0700792# arch Makefile may override CC so keep this after arch Makefile is included
Rik van Riele8f5bdb02005-05-16 21:53:46 -0700793NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
Sam Ravnborge8e69932005-04-30 16:51:42 -0700794CHECKFLAGS += $(NOSTDINC_FLAGS)
795
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796# warn about C99 declaration after statement
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200797KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200799# disable pointer signed / unsigned warnings in gcc 4.0
Michal Marek8417da6f2011-05-02 12:51:15 +0200800KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801
Kirill Smelkovfe8d0a42009-04-09 15:34:34 +0400802# disable invalid "can't wrap" optimizations for signed / pointers
Linus Torvaldsa1378022009-07-12 11:25:04 -0700803KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
Linus Torvaldsd0115552009-03-19 15:53:19 -0700804
Andi Kleen8f7f5c92009-09-18 12:49:37 -0700805# conserve stack if available
806KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
807
Sergei Trofimovich80970472013-09-13 14:51:40 -0700808# disallow errors like 'EXPORT_GPL(foo);' with missing header
809KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
810
811# require functions to have arguments in prototypes, not empty 'int foo()'
812KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
813
Josh Triplettfe7c36c2013-12-23 13:56:06 -0800814# Prohibit date/time macros, which would make the build non-deterministic
815KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
816
Daniel Wagnerea8daa72016-03-08 09:29:09 +0100817# enforce correct pointer usage
818KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
819
Kees Cookc834f0e2017-03-20 17:14:11 -0700820# Require designated initializers for all marked structures
821KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
822
Michal Marek40df7592011-04-20 13:45:30 +0200823# use the deterministic mode of AR if available
824KBUILD_ARFLAGS := $(call ar-option,D)
825
Masahiro Yamadaa436bb72015-03-27 20:43:36 +0900826include scripts/Makefile.kasan
827include scripts/Makefile.extrawarn
Andrey Ryabininc6d30852016-01-20 15:00:55 -0800828include scripts/Makefile.ubsan
Masahiro Yamadaa86fe352014-04-14 18:27:10 +0900829
Michal Marek61754c12015-07-01 17:19:30 +0200830# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
831# last assignments
832KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
833KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
834KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
Sam Ravnborg52bcc332007-10-15 22:03:58 +0200835
Roland McGrath18991192007-07-19 01:48:40 -0700836# Use --build-id when available.
Rabin Vincentbd743702017-04-30 18:16:00 +0200837LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\
Sam Ravnborgf86fd302009-09-19 10:14:33 +0200838 $(call cc-ldoption, -Wl$(comma)--build-id,))
Sam Ravnborg65881692010-07-28 17:33:09 +0200839KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
Roland McGrath18991192007-07-19 01:48:40 -0700840LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
841
Nicholas Pigginb67067f2016-08-24 22:29:20 +1000842ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
843LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
844endif
845
David Howells5d7d18f2009-03-04 11:59:07 -0800846ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
Andi Kleend79a2712009-09-16 22:36:55 +0200847LDFLAGS_vmlinux += $(call ld-option, -X,)
David Howells5d7d18f2009-03-04 11:59:07 -0800848endif
849
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850# Default kernel image to build when no specific target is given.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200851# KBUILD_IMAGE may be overruled on the command line or
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852# set in the environment
853# Also any assignments in arch/$(ARCH)/Makefile take precedence over
854# this default value
855export KBUILD_IMAGE ?= vmlinux
856
857#
858# INSTALL_PATH specifies where to place the updated kernel and system map
859# images. Default is /boot, but you can set it to other values
860export INSTALL_PATH ?= /boot
861
862#
Jason Cooperf4d4ffc2013-12-01 23:56:28 +0000863# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
864# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
865# an argument if needed. Otherwise it defaults to the kernel install path
866#
867export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
868
869#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
871# relocations required by build roots. This is not defined in the
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200872# makefile but the argument can be passed to make if needed.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873#
874
Sam Ravnborgdf9df032006-01-16 12:46:07 +0100875MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876export MODLIB
877
Theodore Ts'oac031f22006-06-21 20:53:09 -0400878#
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +0900879# INSTALL_MOD_STRIP, if defined, will cause modules to be
880# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
881# the default option --strip-debug will be used. Otherwise,
882# INSTALL_MOD_STRIP value will be used as the options to the strip command.
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100883
Theodore Ts'oac031f22006-06-21 20:53:09 -0400884ifdef INSTALL_MOD_STRIP
885ifeq ($(INSTALL_MOD_STRIP),1)
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100886mod_strip_cmd = $(STRIP) --strip-debug
Theodore Ts'oac031f22006-06-21 20:53:09 -0400887else
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100888mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
Theodore Ts'oac031f22006-06-21 20:53:09 -0400889endif # INSTALL_MOD_STRIP=1
890else
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100891mod_strip_cmd = true
Theodore Ts'oac031f22006-06-21 20:53:09 -0400892endif # INSTALL_MOD_STRIP
893export mod_strip_cmd
894
Bertrand Jacquinbeb50df2014-08-27 20:31:56 +0930895# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
896# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
897# or CONFIG_MODULE_COMPRESS_XZ.
898
899mod_compress_cmd = true
900ifdef CONFIG_MODULE_COMPRESS
901 ifdef CONFIG_MODULE_COMPRESS_GZIP
Jason A. Donenfeld3d1450d2015-07-07 20:26:07 +0200902 mod_compress_cmd = gzip -n -f
Bertrand Jacquinbeb50df2014-08-27 20:31:56 +0930903 endif # CONFIG_MODULE_COMPRESS_GZIP
904 ifdef CONFIG_MODULE_COMPRESS_XZ
Jason A. Donenfeld3d1450d2015-07-07 20:26:07 +0200905 mod_compress_cmd = xz -f
Bertrand Jacquinbeb50df2014-08-27 20:31:56 +0930906 endif # CONFIG_MODULE_COMPRESS_XZ
907endif # CONFIG_MODULE_COMPRESS
908export mod_compress_cmd
909
P J P1bf49dd2013-11-12 15:11:44 -0800910# Select initial ramdisk compression format, default is gzip(1).
911# This shall be used by the dracut(8) tool while creating an initramfs image.
912#
Jan Beulich7ac18152013-12-18 17:08:57 -0800913INITRD_COMPRESS-y := gzip
914INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
915INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
916INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
917INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
918INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
Linus Torvaldsb7000ad2013-12-20 16:52:45 -0800919# do not export INITRD_COMPRESS, since we didn't actually
920# choose a sane default compression above.
921# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922
Michal Marekd9d8d7e2013-01-25 13:41:31 +1030923ifdef CONFIG_MODULE_SIG_ALL
David Woodhouse3ee550f2015-08-14 16:17:16 +0100924$(eval $(call config_filename,MODULE_SIG_KEY))
925
926mod_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 +1030927else
928mod_sign_cmd = true
929endif
930export mod_sign_cmd
931
Josh Poimboeuf9f0c18a2017-02-15 12:21:17 -0600932ifdef CONFIG_STACK_VALIDATION
933 has_libelf := $(call try-run,\
934 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
935 ifeq ($(has_libelf),1)
936 objtool_target := tools/objtool FORCE
937 else
Josh Poimboeuf11af8472017-10-13 15:02:00 -0500938 ifdef CONFIG_UNWINDER_ORC
939 $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
Josh Poimboeuf3dd40cb2017-10-03 20:10:36 -0500940 else
941 $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
942 endif
Josh Poimboeuf9f0c18a2017-02-15 12:21:17 -0600943 SKIP_STACK_VALIDATION := 1
944 export SKIP_STACK_VALIDATION
945 endif
946endif
947
Rusty Russelle2a666d2012-10-19 11:53:15 +1030948
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949ifeq ($(KBUILD_EXTMOD),)
David Howellscfc411e2015-08-14 15:20:41 +0100950core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951
952vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
953 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
Feng Wu37d9fe42015-09-22 16:47:29 +0800954 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955
956vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
Feng Wu37d9fe42015-09-22 16:47:29 +0800957 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958
959init-y := $(patsubst %/, %/built-in.o, $(init-y))
960core-y := $(patsubst %/, %/built-in.o, $(core-y))
961drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
962net-y := $(patsubst %/, %/built-in.o, $(net-y))
963libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
Nicholas Piggin3a166fc2017-06-20 01:52:05 +1000964libs-y2 := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y)))
Feng Wu37d9fe42015-09-22 16:47:29 +0800965virt-y := $(patsubst %/, %/built-in.o, $(virt-y))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200967# Externally visible symbols (used by link-vmlinux.sh)
Sam Ravnborg95698572012-05-05 10:18:40 +0200968export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
Nicholas Piggin3a166fc2017-06-20 01:52:05 +1000969export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
970export KBUILD_VMLINUX_LIBS := $(libs-y1)
Sam Ravnborg95698572012-05-05 10:18:40 +0200971export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200972export LDFLAGS_vmlinux
Cao jin312a3d02017-08-02 10:31:06 +0800973# used by scripts/package/Makefile
Feng Wu37d9fe42015-09-22 16:47:29 +0800974export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975
Nicholas Piggin3a166fc2017-06-20 01:52:05 +1000976vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977
Nicolas Pitre2441e782016-04-22 15:25:00 -0400978# Include targets which we want to execute sequentially if the rest of the
979# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
980# evaluated more than once.
981PHONY += vmlinux_prereq
982vmlinux_prereq: $(vmlinux-deps) FORCE
David Woodhouse0f836e5f2006-10-11 01:21:43 -0700983ifdef CONFIG_HEADERS_CHECK
David Woodhouse0e7af8d042006-10-13 16:04:23 +0100984 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
David Woodhouse0f836e5f2006-10-11 01:21:43 -0700985endif
Jan Kiszka3ee7b3f2015-02-17 13:46:36 -0800986ifdef CONFIG_GDB_SCRIPTS
Masahiro Yamada8e9b4662017-08-20 15:04:11 +0900987 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
Jan Kiszka3ee7b3f2015-02-17 13:46:36 -0800988endif
Nicolas Pitre2441e782016-04-22 15:25:00 -0400989ifdef CONFIG_TRIM_UNUSED_KSYMS
Nicolas Ferreba79d402016-04-25 17:55:08 +0200990 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
Nicolas Pitre86556392016-12-02 15:11:50 -0500991 "$(MAKE) -f $(srctree)/Makefile vmlinux"
Nicolas Pitre2441e782016-04-22 15:25:00 -0400992endif
Nicolas Pitre23121ca2016-01-26 21:50:18 -0500993
994# standalone target for easier testing
995include/generated/autoksyms.h: FORCE
Nicolas Ferreba79d402016-04-25 17:55:08 +0200996 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
Nicolas Pitre23121ca2016-01-26 21:50:18 -0500997
Nicholas Pigginfbe6e372016-08-24 22:29:21 +1000998ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
999
1000# Final link of vmlinux with optional arch pass after final link
Cao jin312a3d02017-08-02 10:31:06 +08001001cmd_link-vmlinux = \
1002 $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ; \
Nicholas Pigginfbe6e372016-08-24 22:29:21 +10001003 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
Nicolas Pitre2441e782016-04-22 15:25:00 -04001004
Nicolas Pitreedf69472016-04-26 16:48:44 -04001005vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +02001006 +$(call if_changed,link-vmlinux)
Sam Ravnborg741f98f2007-07-17 10:54:06 +02001007
Nicolas Pitredd924782016-02-28 22:00:00 -05001008# Build samples along the rest of the kernel
1009ifdef CONFIG_SAMPLES
1010vmlinux-dirs += samples
1011endif
1012
Masahiro Yamada38385f82014-04-28 16:26:18 +09001013# The actual objects are generated when descending,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014# make sure no implicit rule kicks in
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +02001015$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016
1017# Handle descending into subdirectories listed in $(vmlinux-dirs)
1018# Preset locale variables to speed up the build process. Limit locale
1019# tweaks to this spot to avoid wrong language settings when running
1020# make menuconfig etc.
1021# Error messages still appears in the original language
1022
Paul Smith4f193362006-03-05 17:14:10 -05001023PHONY += $(vmlinux-dirs)
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001024$(vmlinux-dirs): prepare scripts
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025 $(Q)$(MAKE) $(build)=$@
1026
Michal Marek0d0e7712013-07-11 15:34:51 +02001027define filechk_kernel.release
1028 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1029endef
1030
Geert Uytterhoeven83a35e32013-06-28 11:27:31 +02001031# Store (new) KERNELRELEASE string in include/config/kernel.release
Roman Zippelf1d28fb2006-06-08 22:12:43 -07001032include/config/kernel.release: include/config/auto.conf FORCE
Michal Marek0d0e7712013-07-11 15:34:51 +02001033 $(call filechk,kernel.release)
Sam Ravnborgcb584552006-01-09 21:20:34 +01001034
1035
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036# Things we need to do before we recursively start building the kernel
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001037# or the modules are listed in "prepare".
1038# A multi level approach is used. prepareN is processed before prepareN-1.
1039# archprepare is used in arch Makefiles and when processed asm symlink,
1040# version.h and scripts_basic is processed / created.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001042# Listed in dependency order
Paul Smith4f193362006-03-05 17:14:10 -05001043PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001044
Sam Ravnborg86feeaa2005-09-09 19:28:28 +02001045# prepare3 is used to check if we are building in a separate output directory,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046# and if so do:
1047# 1) Check that make has not been executed in the kernel src $(srctree)
Roman Zippelf1d28fb2006-06-08 22:12:43 -07001048prepare3: include/config/kernel.release
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049ifneq ($(KBUILD_SRC),)
Mike Frysingerfd54f502008-11-06 03:31:35 -05001050 @$(kecho) ' Using $(srctree) as source for kernel'
Roman Zippelc955cca2006-06-08 22:12:39 -07001051 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
Michal Marek5369f552012-07-07 23:04:40 +02001052 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1053 echo >&2 " in the '$(srctree)' directory.";\
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054 /bin/false; \
1055 fi;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056endif
1057
Kees Cookc965b102016-07-26 15:21:17 -07001058# prepare2 creates a makefile if using a separate output directory.
1059# From this point forward, .config has been reprocessed, so any rules
1060# that need to depend on updated CONFIG_* values can be checked here.
1061prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062
David Howellsd183e6f2012-10-02 18:01:56 +01001063prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
Sam Ravnborgf7f16b72009-10-18 00:00:43 +02001064 include/config/auto.conf
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001065 $(cmd_crmodverdir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066
H. Peter Anvin6520fe52012-05-08 21:22:24 +03001067archprepare: archheaders archscripts prepare1 scripts_basic
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001068
Emese Revfy6b90bd42016-05-24 00:09:38 +02001069prepare0: archprepare gcc-plugins
Sam Ravnborg8d36a622005-09-10 21:05:36 +02001070 $(Q)$(MAKE) $(build)=.
Sam Ravnborg86feeaa2005-09-09 19:28:28 +02001071
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072# All the preparing..
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -06001073prepare: prepare0 prepare-objtool
1074
1075PHONY += prepare-objtool
Josh Poimboeuf3b27a0c2016-03-03 11:39:30 -06001076prepare-objtool: $(objtool_target)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077
Kees Cookc965b102016-07-26 15:21:17 -07001078# Check for CONFIG flags that require compiler support. Abort the build
1079# after .config has been processed, but before the kernel build starts.
1080#
1081# For security-sensitive CONFIG options, we don't want to fallback and/or
1082# silently change which compiler flags will be used, since that leads to
1083# producing kernels with different security feature characteristics
1084# depending on the compiler used. (For example, "But I selected
1085# CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1086PHONY += prepare-compiler-check
1087prepare-compiler-check: FORCE
1088# Make sure compiler supports requested stack protector flag.
1089ifdef stackp-name
1090 ifeq ($(call cc-option, $(stackp-flag)),)
1091 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1092 $(stackp-flag) not supported by compiler >&2 && exit 1
1093 endif
1094endif
1095# Make sure compiler does not have buggy stack-protector support.
1096ifdef stackp-check
1097 ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1098 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1099 $(stackp-flag) available but compiler is broken >&2 && exit 1
1100 endif
1101endif
1102 @:
1103
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104# Generate some files
1105# ---------------------------------------------------------------------------
1106
1107# KERNELRELEASE can change from a few different places, meaning version.h
1108# needs to be updated, so this check is forced on all builds
1109
1110uts_len := 64
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001111define filechk_utsrelease.h
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001113 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1114 exit 1; \
1115 fi; \
1116 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117endef
1118
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001119define filechk_version.h
Jesper Juhl450c6072012-02-16 22:49:15 +01001120 (echo \#define LINUX_VERSION_CODE $(shell \
1121 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001122 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1123endef
1124
David Howellsd183e6f2012-10-02 18:01:56 +01001125$(version_h): $(srctree)/Makefile FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126 $(call filechk,version.h)
Michal Marek223c24a2014-11-27 16:13:17 +01001127 $(Q)rm -f $(old_version_h)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128
Sam Ravnborg273b2812009-10-18 00:52:28 +02001129include/generated/utsrelease.h: include/config/kernel.release FORCE
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001130 $(call filechk,utsrelease.h)
1131
Vegard Nossum179efcb2008-12-16 12:33:43 +01001132PHONY += headerdep
1133headerdep:
Peter Foley9663d982011-04-26 17:17:11 -04001134 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1135 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
Vegard Nossum179efcb2008-12-16 12:33:43 +01001136
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137# ---------------------------------------------------------------------------
David Woodhouse8d730cf2006-06-18 11:58:39 +01001138# Kernel headers
David Woodhouse8d730cf2006-06-18 11:58:39 +01001139
Sam Ravnborge6883b12008-06-05 16:43:46 +02001140#Default location for installed headers
1141export INSTALL_HDR_PATH = $(objtree)/usr
1142
Masahiro Yamada0f042ee2017-07-10 03:32:34 +09001143# If we do an all arch process set dst to include/arch-$(hdr-arch)
Nicolas Dichtel61562f92017-03-27 14:20:16 +02001144hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(hdr-arch), dst=include)
Sam Ravnborge6883b12008-06-05 16:43:46 +02001145
H. Peter Anvin052ad272011-11-17 13:17:35 -08001146PHONY += archheaders
1147archheaders:
1148
H. Peter Anvin6520fe52012-05-08 21:22:24 +03001149PHONY += archscripts
1150archscripts:
1151
Sam Ravnborge6883b12008-06-05 16:43:46 +02001152PHONY += __headers
Masahiro Yamadaa9d9a402017-07-10 03:32:59 +09001153__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
Mike Waychisone1b702c2011-03-14 23:34:25 -07001154 $(Q)$(MAKE) $(build)=scripts build_unifdef
David Woodhouse6d716272006-09-24 22:16:03 +01001155
1156PHONY += headers_install_all
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001157headers_install_all:
1158 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
David Woodhouse6d716272006-09-24 22:16:03 +01001159
David Woodhouse8d730cf2006-06-18 11:58:39 +01001160PHONY += headers_install
Sam Ravnborge6883b12008-06-05 16:43:46 +02001161headers_install: __headers
David Howells10b63952012-10-02 18:01:57 +01001162 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1163 $(error Headers not exportable for the $(SRCARCH) architecture))
Masahiro Yamadaa8ff49a2017-07-10 03:32:35 +09001164 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
Nicolas Dichtel61562f92017-03-27 14:20:16 +02001165 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi $(hdr-dst)
David Woodhouse8d730cf2006-06-18 11:58:39 +01001166
Mike Frysinger1f857122007-02-14 00:33:02 -08001167PHONY += headers_check_all
1168headers_check_all: headers_install_all
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001169 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
Mike Frysinger1f857122007-02-14 00:33:02 -08001170
David Woodhouse68475352006-06-18 12:02:10 +01001171PHONY += headers_check
1172headers_check: headers_install
Masahiro Yamadaa8ff49a2017-07-10 03:32:35 +09001173 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
Masahiro Yamada05d8cba2017-05-16 14:15:03 +09001174 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi $(hdr-dst) HDRCHECK=1
David Woodhouse68475352006-06-18 12:02:10 +01001175
David Woodhouse8d730cf2006-06-18 11:58:39 +01001176# ---------------------------------------------------------------------------
Shuah Khan5a5da782014-08-07 13:07:46 -06001177# Kernel selftest
1178
1179PHONY += kselftest
1180kselftest:
Shuah Khan2bc84522017-09-06 16:44:35 -06001181 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
Shuah Khan5a5da782014-08-07 13:07:46 -06001182
Shuah Khan801d2e92017-08-18 15:54:41 -06001183PHONY += kselftest-clean
Wang Longdcb825a2015-10-08 02:41:18 +00001184kselftest-clean:
Shuah Khan2bc84522017-09-06 16:44:35 -06001185 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
Wang Longdcb825a2015-10-08 02:41:18 +00001186
Bamvor Jian Zhang3d6dee72016-01-08 15:27:34 +08001187PHONY += kselftest-merge
1188kselftest-merge:
1189 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1190 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1191 -m $(objtree)/.config \
1192 $(srctree)/tools/testing/selftests/*/config
1193 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1194
Shuah Khan5a5da782014-08-07 13:07:46 -06001195# ---------------------------------------------------------------------------
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196# Modules
1197
1198ifdef CONFIG_MODULES
1199
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001200# By default, build modules as well
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201
Michal Marek73d13932010-03-10 12:28:58 +01001202all: modules
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +09001204# Build modules
Tejun Heo551559e2007-12-07 21:04:30 +09001205#
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +09001206# A module can be listed more than once in obj-m resulting in
1207# duplicate lines in modules.order files. Those are removed
1208# using awk while concatenating to the final file.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209
Paul Smith4f193362006-03-05 17:14:10 -05001210PHONY += modules
Michal Marek2da30e72010-06-07 22:22:12 +02001211modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
Tejun Heo551559e2007-12-07 21:04:30 +09001212 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
Mike Frysingerfd54f502008-11-06 03:31:35 -05001213 @$(kecho) ' Building modules, stage 2.';
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001214 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
Linus Torvalds1da177e2005-04-16 15:20:36 -07001215
Michal Mareka6c36632010-03-08 10:07:12 +01001216modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1217 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1218
Michal Marek73d13932010-03-10 12:28:58 +01001219%/modules.builtin: include/config/auto.conf
Michal Mareka6c36632010-03-08 10:07:12 +01001220 $(Q)$(MAKE) $(modbuiltin)=$*
1221
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222
1223# Target to prepare building external modules
Paul Smith4f193362006-03-05 17:14:10 -05001224PHONY += modules_prepare
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001225modules_prepare: prepare scripts
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226
1227# Target to install modules
Paul Smith4f193362006-03-05 17:14:10 -05001228PHONY += modules_install
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229modules_install: _modinst_ _modinst_post
1230
Paul Smith4f193362006-03-05 17:14:10 -05001231PHONY += _modinst_
Michal Marek2da30e72010-06-07 22:22:12 +02001232_modinst_:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233 @rm -rf $(MODLIB)/kernel
1234 @rm -f $(MODLIB)/source
1235 @mkdir -p $(MODLIB)/kernel
Masahiro Yamada8e9b4662017-08-20 15:04:11 +09001236 @ln -s $(abspath $(srctree)) $(MODLIB)/source
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1238 rm -f $(MODLIB)/build ; \
Michal Marek7e1c0472014-04-25 17:29:45 +02001239 ln -s $(CURDIR) $(MODLIB)/build ; \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240 fi
Tejun Heo551559e2007-12-07 21:04:30 +09001241 @cp -f $(objtree)/modules.order $(MODLIB)/
Michal Marekbc081dd2009-12-07 16:38:33 +01001242 @cp -f $(objtree)/modules.builtin $(MODLIB)/
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001243 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001245# This depmod is only for convenience to give the initial
Linus Torvalds1da177e2005-04-16 15:20:36 -07001246# boot a modules.dep even before / is mounted read-write. However the
1247# boot script depmod is the master version.
Paul Smith4f193362006-03-05 17:14:10 -05001248PHONY += _modinst_post
Linus Torvalds6d128e12013-07-10 19:02:51 -07001249_modinst_post: _modinst_
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001250 $(call cmd,depmod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001251
Josh Boyerd890f512012-11-05 09:09:24 +10301252ifeq ($(CONFIG_MODULE_SIG), y)
1253PHONY += modules_sign
1254modules_sign:
1255 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1256endif
1257
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258else # CONFIG_MODULES
1259
1260# Modules not configured
1261# ---------------------------------------------------------------------------
1262
Masahiro Yamada612e47c2016-03-13 09:39:22 +09001263PHONY += modules modules_install
1264modules modules_install:
Michal Marek5369f552012-07-07 23:04:40 +02001265 @echo >&2
1266 @echo >&2 "The present kernel configuration has modules disabled."
1267 @echo >&2 "Type 'make config' and enable loadable module support."
1268 @echo >&2 "Then build a kernel with module support enabled."
1269 @echo >&2
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270 @exit 1
1271
1272endif # CONFIG_MODULES
1273
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274###
1275# Cleaning is done on three levels.
1276# make clean Delete most generated files
1277# Leave enough to build external modules
1278# make mrproper Delete the current configuration, and all generated files
1279# make distclean Remove editor backup files, patch leftover files and the like
1280
1281# Directories & files removed with 'make clean'
1282CLEAN_DIRS += $(MODVERDIR)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283
1284# Directories & files removed with 'make mrproper'
Sam Ravnborgd8ecc5c2011-04-27 22:29:49 +02001285MRPROPER_DIRS += include/config usr/include include/generated \
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +09001286 arch/*/include/generated .tmp_objdiff
Masahiro Yamadac22bd32c2015-01-08 17:29:38 +09001287MRPROPER_FILES += .config .config.old .version .old_version \
Rusty Russelld5b71932012-10-02 14:35:24 +09301288 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
David Woodhousefb117942015-07-20 21:16:30 +01001289 signing_key.pem signing_key.priv signing_key.x509 \
1290 x509.genkey extra_certificates signing_key.x509.keyid \
Jan Kiszka3ee7b3f2015-02-17 13:46:36 -08001291 signing_key.x509.signer vmlinux-gdb.py
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292
1293# clean - Delete most, but leave enough to build external modules
1294#
1295clean: rm-dirs := $(CLEAN_DIRS)
1296clean: rm-files := $(CLEAN_FILES)
Gerard Snitselaarfb68d4b2012-02-04 02:55:59 -07001297clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298
Pawel Mollbd1ee802012-10-29 11:23:02 +00001299PHONY += $(clean-dirs) clean archclean vmlinuxclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001300$(clean-dirs):
1301 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1302
Pawel Mollbd1ee802012-10-29 11:23:02 +00001303vmlinuxclean:
1304 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
Nicholas Pigginfbe6e372016-08-24 22:29:21 +10001305 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
Pawel Mollbd1ee802012-10-29 11:23:02 +00001306
1307clean: archclean vmlinuxclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001308
1309# mrproper - Delete all generated files, including .config
1310#
1311mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1312mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
Mauro Carvalho Chehabcb43fb52017-05-14 11:50:01 -03001313mrproper-dirs := $(addprefix _mrproper_,scripts)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314
Paul Smith4f193362006-03-05 17:14:10 -05001315PHONY += $(mrproper-dirs) mrproper archmrproper
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316$(mrproper-dirs):
1317 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1318
1319mrproper: clean archmrproper $(mrproper-dirs)
1320 $(call cmd,rmdirs)
1321 $(call cmd,rmfiles)
1322
1323# distclean
1324#
Paul Smith4f193362006-03-05 17:14:10 -05001325PHONY += distclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001326
1327distclean: mrproper
1328 @find $(srctree) $(RCS_FIND_IGNORE) \
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001329 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
Masahiro Yamadaf78271d2017-01-22 23:02:32 +09001330 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1331 -o -name 'core' \) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332 -type f -print | xargs rm -f
1333
1334
1335# Packaging of the kernel to various formats
1336# ---------------------------------------------------------------------------
1337# rpm target kept for backward compatibility
Michal Marekc79624c2014-07-04 22:53:52 +02001338package-dir := scripts/package
Linus Torvalds1da177e2005-04-16 15:20:36 -07001339
Arnaldo Carvalho de Melobafb6742010-06-07 07:44:25 -03001340%src-pkg: FORCE
1341 $(Q)$(MAKE) $(build)=$(package-dir) $@
Zach Brown031ecc62006-06-08 22:12:37 -07001342%pkg: include/config/kernel.release FORCE
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001343 $(Q)$(MAKE) $(build)=$(package-dir) $@
Zach Brown031ecc62006-06-08 22:12:37 -07001344rpm: include/config/kernel.release FORCE
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001345 $(Q)$(MAKE) $(build)=$(package-dir) $@
Linus Torvalds1da177e2005-04-16 15:20:36 -07001346
1347
1348# Brief documentation of the typical targets used
1349# ---------------------------------------------------------------------------
1350
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001351boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
Konstantin Khlebnikova1e7b7b2014-10-28 17:18:20 +04001352boards := $(sort $(notdir $(boards)))
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001353board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1354board-dirs := $(sort $(notdir $(board-dirs:/=)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355
Masahiro Yamadafe69b422016-03-13 09:39:55 +09001356PHONY += help
Linus Torvalds1da177e2005-04-16 15:20:36 -07001357help:
1358 @echo 'Cleaning targets:'
Samuel Tardieu5ea084e2006-12-12 19:09:40 +01001359 @echo ' clean - Remove most generated files but keep the config and'
Jesper Juhl5cc8d242006-09-24 14:01:08 +02001360 @echo ' enough build support to build external modules'
Samuel Tardieu5ea084e2006-12-12 19:09:40 +01001361 @echo ' mrproper - Remove all generated files + config + various backup files'
Jesper Juhl5cc8d242006-09-24 14:01:08 +02001362 @echo ' distclean - mrproper + remove editor backup and patch files'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363 @echo ''
1364 @echo 'Configuration targets:'
1365 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1366 @echo ''
1367 @echo 'Other generic targets:'
1368 @echo ' all - Build all targets marked with [*]'
1369 @echo '* vmlinux - Build the bare kernel'
1370 @echo '* modules - Build all modules'
Bodo Eggert9cc5d742005-11-23 20:11:34 +01001371 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372 @echo ' dir/ - Build all files in dir and below'
Wang YanQing40ab87a42015-12-11 00:35:19 +08001373 @echo ' dir/file.[ois] - Build specified target only'
Vinícius Tinti433db3e2017-04-24 13:04:58 -07001374 @echo ' dir/file.ll - Build the LLVM assembly file'
1375 @echo ' (requires compiler support for LLVM assembly generation)'
Joe Perches62718972010-01-13 09:31:44 -08001376 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1377 @echo ' (requires a recent binutils and recent build (System.map))'
Sam Ravnborg155ad602005-07-07 17:56:08 -07001378 @echo ' dir/file.ko - Build module including final link'
Robert P. J. Dayc4d5ee62009-04-24 12:35:23 -04001379 @echo ' modules_prepare - Set up for building external modules'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380 @echo ' tags/TAGS - Generate tags file for editors'
1381 @echo ' cscope - Generate cscope index'
Jianbin Kangf4ed1002011-01-14 20:07:05 +08001382 @echo ' gtags - Generate GNU GLOBAL index'
Michal Marek3f1d9a62014-07-11 15:57:24 +02001383 @echo ' kernelrelease - Output the release version string (use with make -s)'
1384 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1385 @echo ' image_name - Output the image name (use with make -s)'
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001386 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
Geert Uytterhoeven59df3232007-01-29 13:47:01 +01001387 echo ' (default: $(INSTALL_HDR_PATH))'; \
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001388 echo ''
Randy Dunlap31b8cc82017-05-08 15:55:08 -07001389 @echo 'Static analysers:'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390 @echo ' checkstack - Generate a list of stack hogs'
1391 @echo ' namespacecheck - Name space analysis on compiled kernel'
Sam Ravnborgaa025e72007-11-14 21:34:55 +01001392 @echo ' versioncheck - Sanity check on version.h usage'
Randy Dunlapec2d9872007-11-04 12:01:55 -08001393 @echo ' includecheck - Check for duplicate included header files'
Adrian Bunk295ac052007-08-24 23:04:56 +02001394 @echo ' export_report - List the usages of all exported symbols'
Vegard Nossum179efcb2008-12-16 12:33:43 +01001395 @echo ' headers_check - Sanity check on exported headers'
Nicolas Palix74425ee2010-06-06 17:15:01 +02001396 @echo ' headerdep - Detect inclusion cycles in headers'
1397 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1398 @echo ''
Randy Dunlap31b8cc82017-05-08 15:55:08 -07001399 @echo 'Kernel selftest:'
Shuah Khan5a5da782014-08-07 13:07:46 -06001400 @echo ' kselftest - Build and run kernel selftest (run as root)'
1401 @echo ' Build, install, and boot kernel before'
1402 @echo ' running kselftest on it'
Wang Longdcb825a2015-10-08 02:41:18 +00001403 @echo ' kselftest-clean - Remove all generated kselftest files'
Randy Dunlapbbfe63b62017-10-06 17:17:52 -07001404 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing'
Bamvor Jian Zhang3d6dee72016-01-08 15:27:34 +08001405 @echo ' .config.'
Shuah Khan5a5da782014-08-07 13:07:46 -06001406 @echo ''
Randy Dunlap31b8cc82017-05-08 15:55:08 -07001407 @echo 'Userspace tools targets:'
1408 @echo ' use "make tools/help"'
1409 @echo ' or "cd tools; make help"'
1410 @echo ''
Linus Torvalds1da177e2005-04-16 15:20:36 -07001411 @echo 'Kernel packaging:'
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001412 @$(MAKE) $(build)=$(package-dir) help
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413 @echo ''
1414 @echo 'Documentation targets:'
Mauro Carvalho Chehabcb43fb52017-05-14 11:50:01 -03001415 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416 @echo ''
Andres Salomon01dee182008-04-25 22:34:58 -04001417 @echo 'Architecture specific targets ($(SRCARCH)):'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418 @$(if $(archhelp),$(archhelp),\
Andres Salomon01dee182008-04-25 22:34:58 -04001419 echo ' No architecture specific help defined for $(SRCARCH)')
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420 @echo ''
1421 @$(if $(boards), \
1422 $(foreach b, $(boards), \
1423 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1424 echo '')
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001425 @$(if $(board-dirs), \
1426 $(foreach b, $(board-dirs), \
1427 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1428 printf " %-16s - Show all of the above\\n" help-boards; \
1429 echo '')
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430
1431 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
Sam Ravnborg45d506b2006-08-08 21:35:14 +02001432 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
Cao jin9ba26a72017-06-06 17:07:53 +08001434 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)'
Dustin Kirkland701842e2006-05-23 15:57:23 -05001435 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
Ingo Molnaraf07ce32011-06-16 13:26:23 +02001436 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
Sam Ravnborg28bc20d2011-04-27 22:15:27 +02001437 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1438 @echo ' 1: warnings which may be relevant and do not occur too often'
1439 @echo ' 2: warnings which occur quite often but may still be relevant'
1440 @echo ' 3: more obscure warnings, can most likely be ignored'
Michal Mareka6de5532011-04-29 14:45:31 +02001441 @echo ' Multiple levels can be combined with W=12 or W=123'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442 @echo ''
1443 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1444 @echo 'For further info see the ./README file'
1445
1446
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001447help-board-dirs := $(addprefix help-,$(board-dirs))
1448
1449help-boards: $(help-board-dirs)
1450
Michal Marekfbae4d52014-11-28 13:31:43 +01001451boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001452
1453$(help-board-dirs): help-%:
1454 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1455 @$(if $(boards-per-dir), \
1456 $(foreach b, $(boards-per-dir), \
1457 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1458 echo '')
1459
1460
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461# Documentation targets
1462# ---------------------------------------------------------------------------
Jani Nikulae8939222017-10-09 18:26:15 +03001463DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1464 linkcheckdocs dochelp refcheckdocs
Jani Nikula22cba312016-05-19 15:14:05 +03001465PHONY += $(DOC_TARGETS)
1466$(DOC_TARGETS): scripts_basic FORCE
Mauro Carvalho Chehabcb43fb52017-05-14 11:50:01 -03001467 $(Q)$(MAKE) $(build)=Documentation $@
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468
1469else # KBUILD_EXTMOD
1470
1471###
1472# External module support.
1473# When building external modules the kernel used as basis is considered
1474# read-only, and no consistency checks are made and the make
1475# system is not used on the basis kernel. If updates are required
1476# in the basis kernel ordinary make commands (without M=...) must
1477# be used.
1478#
1479# The following are the only valid targets when building external
1480# modules.
1481# make M=dir clean Delete all automatically generated files
1482# make M=dir modules Make all modules in specified dir
1483# make M=dir Same as 'make M=dir modules'
1484# make M=dir modules_install
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001485# Install the modules built in the module directory
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486# Assumes install directory is already created
1487
1488# We are always building modules
1489KBUILD_MODULES := 1
Paul Smith4f193362006-03-05 17:14:10 -05001490PHONY += crmodverdir
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491crmodverdir:
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001492 $(cmd_crmodverdir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493
Paul Smith4f193362006-03-05 17:14:10 -05001494PHONY += $(objtree)/Module.symvers
Linus Torvalds1da177e2005-04-16 15:20:36 -07001495$(objtree)/Module.symvers:
1496 @test -e $(objtree)/Module.symvers || ( \
1497 echo; \
1498 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1499 echo " is missing; modules will have no dependencies and modversions."; \
1500 echo )
1501
1502module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
Paul Smith4f193362006-03-05 17:14:10 -05001503PHONY += $(module-dirs) modules
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504$(module-dirs): crmodverdir $(objtree)/Module.symvers
1505 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1506
1507modules: $(module-dirs)
Mike Frysingerfd54f502008-11-06 03:31:35 -05001508 @$(kecho) ' Building modules, stage 2.';
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001509 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
Linus Torvalds1da177e2005-04-16 15:20:36 -07001510
Paul Smith4f193362006-03-05 17:14:10 -05001511PHONY += modules_install
Sam Ravnborga67dc212006-01-28 23:51:57 +01001512modules_install: _emodinst_ _emodinst_post
Adrian Bunke6304662006-02-14 15:58:15 +01001513
Paul Smith4f193362006-03-05 17:14:10 -05001514install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1515PHONY += _emodinst_
Sam Ravnborga67dc212006-01-28 23:51:57 +01001516_emodinst_:
Sam Ravnborga67dc212006-01-28 23:51:57 +01001517 $(Q)mkdir -p $(MODLIB)/$(install-dir)
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001518 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
Linus Torvalds1da177e2005-04-16 15:20:36 -07001519
Paul Smith4f193362006-03-05 17:14:10 -05001520PHONY += _emodinst_post
Sam Ravnborga67dc212006-01-28 23:51:57 +01001521_emodinst_post: _emodinst_
1522 $(call cmd,depmod)
1523
Linus Torvalds1da177e2005-04-16 15:20:36 -07001524clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1525
Paul Smith4f193362006-03-05 17:14:10 -05001526PHONY += $(clean-dirs) clean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527$(clean-dirs):
1528 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1529
1530clean: rm-dirs := $(MODVERDIR)
Michal Marek88d7be02010-09-06 12:00:08 +02001531clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532
Masahiro Yamadafe69b422016-03-13 09:39:55 +09001533PHONY += help
Linus Torvalds1da177e2005-04-16 15:20:36 -07001534help:
1535 @echo ' Building external modules.'
1536 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1537 @echo ''
1538 @echo ' modules - default target, build the module(s)'
1539 @echo ' modules_install - install the module'
1540 @echo ' clean - remove generated files in module directory only'
1541 @echo ''
Sam Ravnborg06300b22006-01-25 07:13:18 +01001542
1543# Dummies...
Paul Smith4f193362006-03-05 17:14:10 -05001544PHONY += prepare scripts
Sam Ravnborg06300b22006-01-25 07:13:18 +01001545prepare: ;
1546scripts: ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001547endif # KBUILD_EXTMOD
1548
Michal Marek88d7be02010-09-06 12:00:08 +02001549clean: $(clean-dirs)
1550 $(call cmd,rmdirs)
1551 $(call cmd,rmfiles)
Kevin Cernekee43f67c92011-05-10 15:47:16 -07001552 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
Michal Marek88d7be02010-09-06 12:00:08 +02001553 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
Masahiro Yamada74ce1892017-11-02 11:51:25 +09001554 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
Andi Kleen866ced92014-07-30 20:50:18 +02001555 -o -name '*.dwo' \
Rasmus Villemoesd523b252015-08-20 11:53:29 +02001556 -o -name '*.su' \
Michal Marek88d7be02010-09-06 12:00:08 +02001557 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1558 -o -name '*.symtypes' -o -name 'modules.order' \
1559 -o -name modules.builtin -o -name '.tmp_*.o.*' \
Emese Revfy6b90bd42016-05-24 00:09:38 +02001560 -o -name '*.c.[012]*.*' \
Vinícius Tinti433db3e2017-04-24 13:04:58 -07001561 -o -name '*.ll' \
Michal Marek88d7be02010-09-06 12:00:08 +02001562 -o -name '*.gcno' \) -type f -print | xargs rm -f
1563
Linus Torvalds1da177e2005-04-16 15:20:36 -07001564# Generate tags for editors
1565# ---------------------------------------------------------------------------
Sam Ravnborga680eed2008-12-03 22:24:13 +01001566quiet_cmd_tags = GEN $@
1567 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
Linus Torvalds1da177e2005-04-16 15:20:36 -07001568
Jianbin Kangf4ed1002011-01-14 20:07:05 +08001569tags TAGS cscope gtags: FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001570 $(call cmd,tags)
1571
Linus Torvalds1da177e2005-04-16 15:20:36 -07001572# Scripts to check various things for consistency
1573# ---------------------------------------------------------------------------
1574
Peter Foley279f3dd2011-04-26 17:15:01 -04001575PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1576
Linus Torvalds1da177e2005-04-16 15:20:36 -07001577includecheck:
Peter Foley436f8762011-04-26 17:18:29 -04001578 find $(srctree)/* $(RCS_FIND_IGNORE) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001579 -name '*.[hcS]' -type f -print | sort \
Geert Uytterhoeven80007432007-11-05 11:51:44 +01001580 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
Linus Torvalds1da177e2005-04-16 15:20:36 -07001581
1582versioncheck:
Peter Foley2ee2d292011-04-26 17:19:28 -04001583 find $(srctree)/* $(RCS_FIND_IGNORE) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001584 -name '*.[hcS]' -type f -print | sort \
Geert Uytterhoeven80007432007-11-05 11:51:44 +01001585 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
Linus Torvalds1da177e2005-04-16 15:20:36 -07001586
Nicolas Palix74425ee2010-06-06 17:15:01 +02001587coccicheck:
1588 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1589
Linus Torvalds1da177e2005-04-16 15:20:36 -07001590namespacecheck:
1591 $(PERL) $(srctree)/scripts/namespace.pl
1592
Adrian Bunk295ac052007-08-24 23:04:56 +02001593export_report:
1594 $(PERL) $(srctree)/scripts/export_report.pl
1595
Linus Torvalds1da177e2005-04-16 15:20:36 -07001596endif #ifeq ($(config-targets),1)
1597endif #ifeq ($(mixed-targets),1)
1598
Mike Marciniszync398ff02013-06-24 08:48:37 -04001599PHONY += checkstack kernelrelease kernelversion image_name
Jeff Dikee3ccf6e2006-09-27 01:50:37 -07001600
Jeff Dike011e3a92006-12-13 00:34:12 -08001601# UML needs a little special treatment here. It wants to use the host
1602# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1603# else wants $(ARCH), including people doing cross-builds, which means
1604# that $(SUBARCH) doesn't work here.
1605ifeq ($(ARCH), um)
1606CHECKSTACK_ARCH := $(SUBARCH)
1607else
1608CHECKSTACK_ARCH := $(ARCH)
1609endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001610checkstack:
1611 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
Jeff Dike011e3a92006-12-13 00:34:12 -08001612 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001613
Amerigo Wang7b8ea532010-08-20 05:36:06 -04001614kernelrelease:
1615 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
Amerigo Wang01ab1782010-06-28 10:45:21 +08001616
Sam Ravnborgcb584552006-01-09 21:20:34 +01001617kernelversion:
Sam Ravnborg2244cbd2006-01-16 12:12:12 +01001618 @echo $(KERNELVERSION)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001619
Mike Marciniszync398ff02013-06-24 08:48:37 -04001620image_name:
1621 @echo $(KBUILD_IMAGE)
1622
Borislav Petkovea01fa92012-04-11 18:36:18 +02001623# Clear a bunch of variables before executing the submake
1624tools/: FORCE
David Howellsbf351822012-11-05 21:02:08 +00001625 $(Q)mkdir -p $(objtree)/tools
Masahiro Yamada8e9b4662017-08-20 15:04:11 +09001626 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
Borislav Petkovea01fa92012-04-11 18:36:18 +02001627
1628tools/%: FORCE
David Howellsbf351822012-11-05 21:02:08 +00001629 $(Q)mkdir -p $(objtree)/tools
Masahiro Yamada8e9b4662017-08-20 15:04:11 +09001630 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
Borislav Petkovea01fa92012-04-11 18:36:18 +02001631
Sam Ravnborg06300b22006-01-25 07:13:18 +01001632# Single targets
1633# ---------------------------------------------------------------------------
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001634# Single targets are compatible with:
Robert P. J. Daye1b85132008-02-03 15:14:02 +02001635# - build with mixed source and output
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001636# - build with separate output dir 'make O=...'
1637# - external modules
1638#
1639# target-dir => where to store outputfile
1640# build-dir => directory in kernel source tree to use
Sam Ravnborg06300b22006-01-25 07:13:18 +01001641
Sam Ravnborg06300b22006-01-25 07:13:18 +01001642ifeq ($(KBUILD_EXTMOD),)
Sam Ravnborgaa360872006-04-06 08:25:31 +02001643 build-dir = $(patsubst %/,%,$(dir $@))
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001644 target-dir = $(dir $@)
Sam Ravnborg06300b22006-01-25 07:13:18 +01001645else
1646 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001647 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1648 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
Sam Ravnborg06300b22006-01-25 07:13:18 +01001649endif
1650
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001651%.s: %.c prepare scripts FORCE
1652 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1653%.i: %.c prepare scripts FORCE
1654 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1655%.o: %.c prepare scripts FORCE
1656 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1657%.lst: %.c prepare scripts FORCE
1658 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1659%.s: %.S prepare scripts FORCE
1660 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1661%.o: %.S prepare scripts FORCE
1662 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
Andreas Gruenbacher15fde672006-05-09 20:37:30 +02001663%.symtypes: %.c prepare scripts FORCE
1664 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
Vinícius Tinti433db3e2017-04-24 13:04:58 -07001665%.ll: %.c prepare scripts FORCE
1666 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001667
1668# Modules
Sam Ravnborg31110eb2008-12-13 23:00:45 +01001669/: prepare scripts FORCE
1670 $(cmd_crmodverdir)
1671 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1672 $(build)=$(build-dir)
Peter Foley8e2faea2014-09-25 11:23:58 -07001673# Make sure the latest headers are built for Documentation
Arnd Bergmannddea05f2016-07-04 16:39:35 +02001674Documentation/ samples/: headers_install
Sam Ravnborg31110eb2008-12-13 23:00:45 +01001675%/: prepare scripts FORCE
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001676 $(cmd_crmodverdir)
Sam Ravnborg06300b22006-01-25 07:13:18 +01001677 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001678 $(build)=$(build-dir)
1679%.ko: prepare scripts FORCE
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001680 $(cmd_crmodverdir)
Sam Ravnborg06300b22006-01-25 07:13:18 +01001681 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001682 $(build)=$(build-dir) $(@:.ko=.o)
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001683 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
Sam Ravnborg06300b22006-01-25 07:13:18 +01001684
Masahiro Yamada38385f82014-04-28 16:26:18 +09001685# FIXME Should go into a make.lib or something
Linus Torvalds1da177e2005-04-16 15:20:36 -07001686# ===========================================================================
1687
1688quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1689 cmd_rmdirs = rm -rf $(rm-dirs)
1690
1691quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1692 cmd_rmfiles = rm -f $(rm-files)
1693
Uwe Kleine-Königbc3c26f2008-04-21 22:53:56 +00001694# Run depmod only if we have System.map and depmod is executable
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001695quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
Michal Marek569658d2011-06-15 22:15:47 +02001696 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
Rusty Russellb92021b2013-03-15 15:04:17 +10301697 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001698
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001699# Create temporary dir for module support files
Sam Ravnborgab19f872007-10-22 11:23:07 +02001700# clean it up only when building all modules
1701cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1702 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001703
Linus Torvalds1da177e2005-04-16 15:20:36 -07001704# read all saved command lines
1705
1706targets := $(wildcard $(sort $(targets)))
1707cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1708
1709ifneq ($(cmd_files),)
1710 $(cmd_files): ; # Do not try to update included dependency files
1711 include $(cmd_files)
1712endif
1713
Linus Torvalds1da177e2005-04-16 15:20:36 -07001714endif # skip-makefile
1715
Paul Smith4f193362006-03-05 17:14:10 -05001716PHONY += FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001717FORCE:
Paul Smith4f193362006-03-05 17:14:10 -05001718
Paul Smith4f193362006-03-05 17:14:10 -05001719# Declare the contents of the .PHONY variable as phony. We keep that
Kirill Smelkovfe8d0a42009-04-09 15:34:34 +04001720# information in a variable so we can use it in if_changed and friends.
Paul Smith4f193362006-03-05 17:14:10 -05001721.PHONY: $(PHONY)