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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 Torvaldsbb176f62017-10-23 06:49:47 -04005EXTRAVERSION = -rc6
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 := $(KBUILD_OUTPUT)
Masahiro Yamada8e9b4662017-08-20 15:04:11 +0900134$(shell [ -d $(KBUILD_OUTPUT) ] || mkdir -p $(KBUILD_OUTPUT))
135KBUILD_OUTPUT := $(realpath $(KBUILD_OUTPUT))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136$(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/ \
Will Deaconf1b99392013-01-18 19:00:47 +0000229 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
231# Cross compiling and selecting different set of gcc/bin-utils
232# ---------------------------------------------------------------------------
233#
234# When performing cross compilation for other architectures ARCH shall be set
235# to the target architecture. (See arch/* for the possibilities).
236# ARCH can be set during invocation of make:
237# make ARCH=ia64
238# Another way is to have ARCH set in the environment.
239# The default ARCH is the host where make is executed.
240
241# CROSS_COMPILE specify the prefix used for all executables used
242# during compilation. Only gcc and related bin-utils executables
243# are prefixed with $(CROSS_COMPILE).
244# CROSS_COMPILE can be set on the command line
245# make CROSS_COMPILE=ia64-linux-
246# Alternatively CROSS_COMPILE can be set in the environment.
Roland McGrath84336462009-12-21 16:24:06 -0800247# A third alternative is to store a setting in .config so that plain
248# "make" in the configured kernel build directory always uses that.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249# Default value for CROSS_COMPILE is not to prefix executables
250# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
Sam Ravnborg2331d1a2009-10-11 23:22:58 +0200251ARCH ?= $(SUBARCH)
Roland McGrath84336462009-12-21 16:24:06 -0800252CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253
254# Architecture as present in compile.h
Thomas Gleixner6752ed92007-10-11 11:11:36 +0200255UTS_MACHINE := $(ARCH)
256SRCARCH := $(ARCH)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
Sam Ravnborgd746d642007-11-12 20:14:19 +0100258# Additional ARCH settings for x86
259ifeq ($(ARCH),i386)
260 SRCARCH := x86
261endif
262ifeq ($(ARCH),x86_64)
263 SRCARCH := x86
264endif
Sam Ravnborg74b469f2007-10-25 19:42:04 +0200265
Sam Ravnborg5e538792008-12-02 23:17:12 -0800266# Additional ARCH settings for sparc
Namhyung Kime69f58c2010-10-25 05:48:23 +0000267ifeq ($(ARCH),sparc32)
268 SRCARCH := sparc
269endif
Sam Ravnborga439fe52008-07-27 23:00:59 +0200270ifeq ($(ARCH),sparc64)
Sam Ravnborg5e538792008-12-02 23:17:12 -0800271 SRCARCH := sparc
Sam Ravnborga439fe52008-07-27 23:00:59 +0200272endif
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +0200273
Paul Mundt3cc000b2009-04-11 08:39:27 +0900274# Additional ARCH settings for sh
275ifeq ($(ARCH),sh64)
276 SRCARCH := sh
277endif
278
Chris Metcalf18aecc22011-05-04 14:38:26 -0400279# Additional ARCH settings for tile
Chris Metcalf6738d322011-05-25 15:24:00 -0400280ifeq ($(ARCH),tilepro)
281 SRCARCH := tile
282endif
Chris Metcalf18aecc22011-05-04 14:38:26 -0400283ifeq ($(ARCH),tilegx)
284 SRCARCH := tile
285endif
286
Sam Ravnborg5e538792008-12-02 23:17:12 -0800287# Where to locate arch specific headers
288hdr-arch := $(SRCARCH)
289
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700290KCONFIG_CONFIG ?= .config
Ben Gardiner41263fc2010-12-14 11:39:44 -0500291export KCONFIG_CONFIG
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700292
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293# SHELL used by kbuild
294CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
295 else if [ -x /bin/bash ]; then echo /bin/bash; \
296 else echo sh; fi ; fi)
297
Uwe Kleine-Königd7f14c62017-07-09 20:02:36 +0200298HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS)
299HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS)
300HOST_LFS_LIBS := $(shell getconf LFS_LIBS)
301
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200302HOSTCC = gcc
303HOSTCXX = g++
Uwe Kleine-Königd7f14c62017-07-09 20:02:36 +0200304HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
305 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS)
306HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)
307HOSTLDFLAGS := $(HOST_LFS_LDFLAGS)
308HOST_LOADLIBES := $(HOST_LFS_LIBS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309
Behan Webster61163ef2013-09-03 22:27:23 -0400310ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
311HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
312 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
313endif
314
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200315# Decide whether to build built-in, modular, or both.
316# Normally, just do built-in.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317
318KBUILD_MODULES :=
319KBUILD_BUILTIN := 1
320
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +0900321# If we have only "make modules", don't compile built-in objects.
322# When we're building modules with modversions, we need to consider
323# the built-in objects during the descend as well, in order to
324# make sure the checksums are up to date before we record them.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325
326ifeq ($(MAKECMDGOALS),modules)
327 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
328endif
329
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +0900330# If we have "make <whatever> modules", compile modules
331# in addition to whatever we do anyway.
332# Just "make" or "make all" shall build modules as well
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333
334ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
335 KBUILD_MODULES := 1
336endif
337
338ifeq ($(MAKECMDGOALS),)
339 KBUILD_MODULES := 1
340endif
341
Sam Ravnborge579d352005-07-27 08:10:10 +0200342export KBUILD_MODULES KBUILD_BUILTIN
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
344
Sam Ravnborg1cacc9a2007-12-06 22:20:11 +0100345# We need some generic definitions (do not try to remake the file).
Masahiro Yamadaa436bb72015-03-27 20:43:36 +0900346scripts/Kbuild.include: ;
347include scripts/Kbuild.include
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348
349# Make variables (CC, etc...)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350AS = $(CROSS_COMPILE)as
351LD = $(CROSS_COMPILE)ld
352CC = $(CROSS_COMPILE)gcc
353CPP = $(CC) -E
354AR = $(CROSS_COMPILE)ar
355NM = $(CROSS_COMPILE)nm
356STRIP = $(CROSS_COMPILE)strip
357OBJCOPY = $(CROSS_COMPILE)objcopy
358OBJDUMP = $(CROSS_COMPILE)objdump
359AWK = awk
360GENKSYMS = scripts/genksyms/genksyms
Sam Ravnborgcaa27b62009-07-20 21:37:11 +0200361INSTALLKERNEL := installkernel
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362DEPMOD = /sbin/depmod
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363PERL = perl
Masahiro Yamada011bf122014-07-18 13:40:11 +0900364PYTHON = python
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365CHECK = sparse
366
Hannes Eder80a7d1d2008-12-27 22:38:44 +0100367CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
368 -Wbitwise -Wno-return-void $(CF)
Michal Marekb36fad62016-06-07 11:57:02 +0200369NOSTDINC_FLAGS =
Sam Ravnborg65881692010-07-28 17:33:09 +0200370CFLAGS_MODULE =
371AFLAGS_MODULE =
372LDFLAGS_MODULE =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373CFLAGS_KERNEL =
374AFLAGS_KERNEL =
Michal Marekb36fad62016-06-07 11:57:02 +0200375LDFLAGS_vmlinux =
Arnd Bergmannb334e192017-01-13 16:40:01 +0100376CFLAGS_GCOV := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
Emese Revfy543c37c2016-05-24 00:11:37 +0200377CFLAGS_KCOV := $(call cc-option,-fsanitize-coverage=trace-pc,)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378
379
David Howellsabbf1592012-10-02 18:01:26 +0100380# Use USERINCLUDE when you must reference the UAPI directories only.
381USERINCLUDE := \
382 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
Arnd Bergmann3308b282016-06-15 17:45:45 +0200383 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
David Howellsabbf1592012-10-02 18:01:26 +0100384 -I$(srctree)/include/uapi \
Arnd Bergmann3308b282016-06-15 17:45:45 +0200385 -I$(objtree)/include/generated/uapi \
David Howellsabbf1592012-10-02 18:01:26 +0100386 -include $(srctree)/include/linux/kconfig.h
387
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388# Use LINUXINCLUDE when you must reference the include/ directory.
389# Needed to be compatible with the O= option
David Howellsabbf1592012-10-02 18:01:26 +0100390LINUXINCLUDE := \
391 -I$(srctree)/arch/$(hdr-arch)/include \
Arnd Bergmann3308b282016-06-15 17:45:45 +0200392 -I$(objtree)/arch/$(hdr-arch)/include/generated \
David Howellsabbf1592012-10-02 18:01:26 +0100393 $(if $(KBUILD_SRC), -I$(srctree)/include) \
Masahiro Yamadaf8224f72017-06-06 16:15:28 +0900394 -I$(objtree)/include \
395 $(USERINCLUDE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396
Sam Ravnborgd8672b42008-11-21 21:50:02 +0100397KBUILD_CPPFLAGS := -D__KERNEL__
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200399KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
Arnd Bergmann8c970232017-07-26 15:36:23 +0200400 -fno-strict-aliasing -fno-common -fshort-wchar \
Floris Kraaka8735822009-06-15 08:54:02 +0300401 -Werror-implicit-function-declaration \
Kirill A. Shutemov51b97e32014-10-20 12:23:12 +0300402 -Wno-format-security \
Borislav Petkovc6a38552016-11-14 19:41:31 +0100403 -std=gnu89 $(call cc-option,-fno-PIE)
404
Geert Uytterhoevena1c48bb2014-05-27 09:54:12 +0200405
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200406KBUILD_AFLAGS_KERNEL :=
407KBUILD_CFLAGS_KERNEL :=
Borislav Petkovc6a38552016-11-14 19:41:31 +0100408KBUILD_AFLAGS := -D__ASSEMBLY__ $(call cc-option,-fno-PIE)
Sam Ravnborg65881692010-07-28 17:33:09 +0200409KBUILD_AFLAGS_MODULE := -DMODULE
410KBUILD_CFLAGS_MODULE := -DMODULE
411KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700413# Read KERNELRELEASE from include/config/kernel.release (if it exists)
414KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
Michal Marekcacd54e2011-05-30 13:36:07 +0200415KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
Sam Ravnborgcb584552006-01-09 21:20:34 +0100416
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200417export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
Sam Ravnborg80ef88d2007-11-17 15:37:31 +0100418export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
Uwe Kleine-Königd7f14c62017-07-09 20:02:36 +0200419export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
Masahiro Yamada011bf122014-07-18 13:40:11 +0900420export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200421export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422
Sam Ravnborg06c50402007-10-15 22:17:25 +0200423export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
Dmitry Vyukov5c9a8752016-03-22 14:27:30 -0700424export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
Sam Ravnborg222d3942007-10-15 21:59:31 +0200425export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
Sam Ravnborg65881692010-07-28 17:33:09 +0200426export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200427export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
Michal Marek40df7592011-04-20 13:45:30 +0200428export KBUILD_ARFLAGS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429
430# When compiling out-of-tree modules, put MODVERDIR in the module
431# tree rather than in the kernel tree. The kernel tree might
432# even be read-only.
433export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
434
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435# Files to ignore in find ... statements
436
Prarit Bhargavaae63b2d2014-02-06 07:51:42 -0500437export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
438 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
439 -prune -o
Jesper Juhl450c6072012-02-16 22:49:15 +0100440export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
441 --exclude CVS --exclude .pc --exclude .hg --exclude .git
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442
443# ===========================================================================
444# Rules shared between *config targets and build targets
445
Cao jin312a3d02017-08-02 10:31:06 +0800446# Basic helpers built in scripts/basic/
Paul Smith4f193362006-03-05 17:14:10 -0500447PHONY += scripts_basic
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448scripts_basic:
449 $(Q)$(MAKE) $(build)=scripts/basic
Steven Rostedt638adb02009-11-17 10:48:25 -0500450 $(Q)rm -f .tmp_quiet_recordmcount
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451
Jan Beulichcd05e6b2005-09-06 11:47:04 +0200452# To avoid any implicit rule to kick in, define an empty command.
453scripts/basic/%: scripts_basic ;
454
Paul Smith4f193362006-03-05 17:14:10 -0500455PHONY += outputmakefile
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200456# outputmakefile generates a Makefile in the output directory, if using a
457# separate output directory. This allows convenient use of make in the
458# output directory.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459outputmakefile:
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200460ifneq ($(KBUILD_SRC),)
Andi Kleen92979992009-01-10 04:56:13 +0100461 $(Q)ln -fsn $(srctree) source
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200462 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
463 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
464endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465
Sam Ravnborgd8ecc5c2011-04-27 22:29:49 +0200466# Support for using generic headers in asm-generic
Masahiro Yamadaa9d9a402017-07-10 03:32:59 +0900467PHONY += asm-generic uapi-asm-generic
468asm-generic: uapi-asm-generic
Sam Ravnborgd8ecc5c2011-04-27 22:29:49 +0200469 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
Catalin Marinas3c5994c2012-10-17 12:25:44 +0100470 src=asm obj=arch/$(SRCARCH)/include/generated/asm
Masahiro Yamadaa9d9a402017-07-10 03:32:59 +0900471uapi-asm-generic:
Catalin Marinas3c5994c2012-10-17 12:25:44 +0100472 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
473 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
Sam Ravnborgd8ecc5c2011-04-27 22:29:49 +0200474
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475# To make sure we do not include .config for any of the *config targets
476# catch them early, and hand them over to scripts/kconfig/Makefile
477# It is allowed to specify more targets when calling make, including
478# mixing *config targets and build targets.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200479# For example 'make oldconfig all'.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480# Detect when mixed targets is specified, and make a second invocation
481# of make so .config is not included in this case either (for *config).
482
David Howells10b63952012-10-02 18:01:57 +0100483version_h := include/generated/uapi/linux/version.h
Michal Marek223c24a2014-11-27 16:13:17 +0100484old_version_h := include/linux/version.h
David Howellsd183e6f2012-10-02 18:01:56 +0100485
Roman Zippel3eb3c742007-01-10 14:45:28 +0100486no-dot-config-targets := clean mrproper distclean \
Michal Marekfbae4d52014-11-28 13:31:43 +0100487 cscope gtags TAGS tags help% %docs check% coccicheck \
David Howellsd183e6f2012-10-02 18:01:56 +0100488 $(version_h) headers_% archheaders archscripts \
Linus Torvalds4aed2fd2010-08-06 09:30:52 -0700489 kernelversion %src-pkg
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490
491config-targets := 0
492mixed-targets := 0
493dot-config := 1
494
495ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
496 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
497 dot-config := 0
498 endif
499endif
500
501ifeq ($(KBUILD_EXTMOD),)
502 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
503 config-targets := 1
Masahiro Yamadad0d38cd2014-12-11 19:12:34 +0900504 ifneq ($(words $(MAKECMDGOALS)),1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 mixed-targets := 1
506 endif
507 endif
508endif
Cao jin312a3d02017-08-02 10:31:06 +0800509# install and modules_install need also be processed one by one
Michal Mareka85a41e2015-12-10 15:53:06 +0100510ifneq ($(filter install,$(MAKECMDGOALS)),)
511 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
512 mixed-targets := 1
513 endif
514endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515
516ifeq ($(mixed-targets),1)
517# ===========================================================================
518# We're called with mixed targets (*config and build targets).
519# Handle them one by one.
520
Masahiro Yamada9319f452014-04-09 15:51:35 +0900521PHONY += $(MAKECMDGOALS) __build_one_by_one
522
523$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
524 @:
525
526__build_one_by_one:
527 $(Q)set -e; \
528 for i in $(MAKECMDGOALS); do \
529 $(MAKE) -f $(srctree)/Makefile $$i; \
530 done
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531
532else
533ifeq ($(config-targets),1)
534# ===========================================================================
535# *config targets only - make sure prerequisites are updated, and descend
536# in scripts/kconfig to make the *config target
537
538# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
539# KBUILD_DEFCONFIG may point out an alternative default configuration
540# used for 'make defconfig'
Masahiro Yamadaa436bb72015-03-27 20:43:36 +0900541include arch/$(SRCARCH)/Makefile
Al Viro61bee202008-08-25 04:51:27 -0400542export KBUILD_DEFCONFIG KBUILD_KCONFIG
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543
Sam Ravnborg31110eb2008-12-13 23:00:45 +0100544config: scripts_basic outputmakefile FORCE
Sam Ravnborg31110eb2008-12-13 23:00:45 +0100545 $(Q)$(MAKE) $(build)=scripts/kconfig $@
546
547%config: scripts_basic outputmakefile FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 $(Q)$(MAKE) $(build)=scripts/kconfig $@
549
550else
551# ===========================================================================
552# Build targets only - this includes vmlinux, arch specific targets, clean
553# targets and others. In general all targets except *config targets.
554
555ifeq ($(KBUILD_EXTMOD),)
556# Additional helpers built in scripts/
557# Carefully list dependencies so we do not try to build scripts twice
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200558# in parallel
Paul Smith4f193362006-03-05 17:14:10 -0500559PHONY += scripts
Andreas Schwaba54292f2013-04-09 19:57:00 +0200560scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
Emese Revfy6b90bd42016-05-24 00:09:38 +0200561 asm-generic gcc-plugins
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 $(Q)$(MAKE) $(build)=$(@)
563
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564# Objects we will link into vmlinux / subdirs we need to visit
565init-y := init/
Markus Trippelsdorfdf85b2d2017-09-16 11:01:16 +0200566drivers-y := drivers/ sound/ firmware/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567net-y := net/
568libs-y := lib/
569core-y := usr/
Feng Wu37d9fe42015-09-22 16:47:29 +0800570virt-y := virt/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571endif # KBUILD_EXTMOD
572
573ifeq ($(dot-config),1)
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200574# Read in config
575-include include/config/auto.conf
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200577ifeq ($(KBUILD_EXTMOD),)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578# Read in dependencies to all Kconfig* files, make sure to run
579# oldconfig if changes are detected.
Roman Zippelc955cca2006-06-08 22:12:39 -0700580-include include/config/auto.conf.cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582# To avoid any implicit rule to kick in, define an empty command
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700583$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584
Roman Zippelc955cca2006-06-08 22:12:39 -0700585# If .config is newer than include/config/auto.conf, someone tinkered
Sam Ravnborg752625c2005-12-26 23:34:03 +0100586# with it and forgot to run make oldconfig.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200587# if auto.conf.cmd is missing then we are probably in a cleaned tree so
Sam Ravnborg752625c2005-12-26 23:34:03 +0100588# we execute the config step to be sure to catch updated Kconfig files
Michal Marekbc081dd2009-12-07 16:38:33 +0100589include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
591else
Sam Ravnborg264a2682009-10-18 00:49:24 +0200592# external modules needs include/generated/autoconf.h and include/config/auto.conf
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200593# but do not care if they are up-to-date. Use auto.conf to trigger the test
594PHONY += include/config/auto.conf
595
596include/config/auto.conf:
Sam Ravnborg264a2682009-10-18 00:49:24 +0200597 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
Michal Marek5369f552012-07-07 23:04:40 +0200598 echo >&2; \
599 echo >&2 " ERROR: Kernel configuration is invalid."; \
600 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
601 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
602 echo >&2 ; \
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200603 /bin/false)
604
605endif # KBUILD_EXTMOD
Roman Zippelc955cca2006-06-08 22:12:39 -0700606
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607else
608# Dummy target needed, because used as prerequisite
Roman Zippelc955cca2006-06-08 22:12:39 -0700609include/config/auto.conf: ;
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200610endif # $(dot-config)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611
Nicolas Pitre86556392016-12-02 15:11:50 -0500612# For the kernel to actually contain only the needed exported symbols,
613# we have to build modules as well to determine what those symbols are.
614# (this can be evaluated only once include/config/auto.conf has been included)
615ifdef CONFIG_TRIM_UNUSED_KSYMS
616 KBUILD_MODULES := 1
617endif
618
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619# The all: target is the default when no target is given on the
620# command line.
621# This allow a user to issue only 'make' to build a kernel including modules
Michal Marekc8447162010-06-03 10:54:58 +0200622# Defaults to vmlinux, but the arch makefile usually adds further targets
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623all: vmlinux
624
Michal Marek6dd3f132015-07-16 18:23:53 +0200625# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
626# values of the respective KBUILD_* variables
627ARCH_CPPFLAGS :=
628ARCH_AFLAGS :=
629ARCH_CFLAGS :=
Masahiro Yamadaa436bb72015-03-27 20:43:36 +0900630include arch/$(SRCARCH)/Makefile
Geert Uytterhoevena1c48bb2014-05-27 09:54:12 +0200631
632KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
Linus Torvaldsef6000b2016-10-12 10:23:41 -0700633KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
Linus Torvaldsbd664f62017-07-12 19:25:47 -0700634KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
635KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
636KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context)
Geert Uytterhoevena1c48bb2014-05-27 09:54:12 +0200637
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
Behan Webster6748cb32017-03-27 18:19:09 -0700639KBUILD_CFLAGS += $(call cc-option,-Oz,-Os)
640KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641else
Arnd Bergmann815eb712016-04-25 17:35:28 +0200642ifdef CONFIG_PROFILE_ALL_BRANCHES
Arnd Bergmanna76bcf52016-11-10 17:44:44 +0100643KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,)
Arnd Bergmann815eb712016-04-25 17:35:28 +0200644else
645KBUILD_CFLAGS += -O2
646endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647endif
648
Arnd Bergmanna76bcf52016-11-10 17:44:44 +0100649KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
650 $(call cc-disable-warning,maybe-uninitialized,))
651
Jiri Kosina69102312014-08-06 16:08:43 -0700652# Tell gcc to never replace conditional load with a non-conditional one
653KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
654
Gleb Fotengauer-Malinovskiy7292ae32017-03-20 20:15:53 +0300655# check for 'asm goto'
656ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
657 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
658 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
659endif
660
Emese Revfy6b90bd42016-05-24 00:09:38 +0200661include scripts/Makefile.gcc-plugins
662
Andi Kleen1873e872012-03-28 11:51:18 -0700663ifdef CONFIG_READABLE_ASM
664# Disable optimizations that make assembler listings hard to read.
665# reorder blocks reorders the control in the function
666# ipa clone creates specialized cloned functions
667# partial inlining inlines only parts of functions
668KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
669 $(call cc-option,-fno-ipa-cp-clone,) \
670 $(call cc-option,-fno-partial-inlining)
671endif
672
Mike Frysinger08f67462009-06-04 16:29:08 -0700673ifneq ($(CONFIG_FRAME_WARN),0)
Andi Kleen35bb5b12008-02-22 15:15:03 +0100674KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
675endif
676
Kees Cookc965b102016-07-26 15:21:17 -0700677# This selects the stack protector compiler flag. Testing it is delayed
678# until after .config has been reprocessed, in the prepare-compiler-check
679# target.
Kees Cook87796572013-12-19 11:35:59 -0800680ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
Kees Cook19952a92013-12-19 11:35:58 -0800681 stackp-flag := -fstack-protector
Kees Cookc965b102016-07-26 15:21:17 -0700682 stackp-name := REGULAR
Jan Beulich6c15b322014-02-25 15:01:48 -0800683else
684ifdef CONFIG_CC_STACKPROTECTOR_STRONG
Kees Cook87796572013-12-19 11:35:59 -0800685 stackp-flag := -fstack-protector-strong
Kees Cookc965b102016-07-26 15:21:17 -0700686 stackp-name := STRONG
Kees Cook19952a92013-12-19 11:35:58 -0800687else
688 # Force off for distro compilers that enable stack protector by default.
689 stackp-flag := $(call cc-option, -fno-stack-protector)
Tejun Heo5d707e92009-02-09 22:17:39 +0900690endif
Jan Beulich6c15b322014-02-25 15:01:48 -0800691endif
Kees Cookc965b102016-07-26 15:21:17 -0700692# Find arch-specific stack protector compiler sanity-checking script.
693ifdef CONFIG_CC_STACKPROTECTOR
Kees Cook228d96c2016-07-26 14:26:20 -0700694 stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
695 stackp-check := $(wildcard $(stackp-path))
Kees Cookc965b102016-07-26 15:21:17 -0700696endif
Kees Cook19952a92013-12-19 11:35:58 -0800697KBUILD_CFLAGS += $(stackp-flag)
Sam Ravnborge06b8b92008-02-13 22:43:28 +0100698
Michal Marek5631d9c2015-08-19 17:36:41 +0200699ifeq ($(cc-name),clang)
Behan Webster785f11a2017-04-21 11:20:01 -0700700ifneq ($(CROSS_COMPILE),)
701CLANG_TARGET := -target $(notdir $(CROSS_COMPILE:%-=%))
702GCC_TOOLCHAIN := $(realpath $(dir $(shell which $(LD)))/..)
703endif
704ifneq ($(GCC_TOOLCHAIN),)
705CLANG_GCC_TC := -gcc-toolchain $(GCC_TOOLCHAIN)
706endif
707KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
708KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
Behan Webster61163ef2013-09-03 22:27:23 -0400709KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
Behan Webster61163ef2013-09-03 22:27:23 -0400710KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
711KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
712KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
Matthias Kaehlckebfb38982017-04-21 14:39:30 -0700713KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
Behan Webster61163ef2013-09-03 22:27:23 -0400714# Quiet clang warning: comparison of unsigned expression < 0 is always false
715KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
716# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
717# source of a reference will be _MergedGlobals and not on of the whitelisted names.
718# See modpost pattern 2
719KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
Behan Webster26ea6bb2014-07-31 21:08:25 -0700720KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
Michael Davidsona37c45c2017-04-25 15:47:35 -0700721KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
722KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
Behan Webster61163ef2013-09-03 22:27:23 -0400723else
724
Arnd Bergmannc9c68372016-05-10 23:30:01 +0200725# These warnings generated too much noise in a regular build.
Seung-Woo Kim35288e32017-03-10 11:01:00 +0900726# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
Michal Marek8417da6f2011-05-02 12:51:15 +0200727KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
Arnd Bergmannc9c68372016-05-10 23:30:01 +0200728KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
Behan Webster61163ef2013-09-03 22:27:23 -0400729endif
Dave Jonesaf0e5d52011-04-21 17:28:13 -0400730
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731ifdef CONFIG_FRAME_POINTER
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200732KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733else
Rabin Vincent7e9501f2010-08-10 19:20:53 +0100734# Some targets (ARM with Thumb2, for example), can't be built with frame
735# pointers. For those, we don't have FUNCTION_TRACER automatically
736# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
737# incompatible with -fomit-frame-pointer with current GCC, so we don't use
738# -fomit-frame-pointer with FUNCTION_TRACER.
739ifndef CONFIG_FUNCTION_TRACER
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200740KBUILD_CFLAGS += -fomit-frame-pointer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741endif
Rabin Vincent7e9501f2010-08-10 19:20:53 +0100742endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743
Linus Torvalds2062afb2014-07-26 14:52:01 -0700744KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
745
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746ifdef CONFIG_DEBUG_INFO
Andi Kleen866ced92014-07-30 20:50:18 +0200747ifdef CONFIG_DEBUG_INFO_SPLIT
748KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
749else
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200750KBUILD_CFLAGS += -g
Andi Kleen866ced92014-07-30 20:50:18 +0200751endif
Behan Webster22883282014-02-14 15:19:17 -0800752KBUILD_AFLAGS += -Wa,-gdwarf-2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753endif
Andi Kleenbfaf2dd2014-07-30 20:50:19 +0200754ifdef CONFIG_DEBUG_INFO_DWARF4
755KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
756endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757
Andi Kleend6f4ceb2010-07-14 15:43:52 +0200758ifdef CONFIG_DEBUG_INFO_REDUCED
Andi Kleene82c4bb2013-02-07 13:58:40 -0800759KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
760 $(call cc-option,-fno-var-tracking)
Andi Kleend6f4ceb2010-07-14 15:43:52 +0200761endif
762
Steven Rostedt606576c2008-10-06 19:06:12 -0400763ifdef CONFIG_FUNCTION_TRACER
Heiko Carstensc0a80c02015-01-09 13:06:33 +0100764ifndef CC_FLAGS_FTRACE
765CC_FLAGS_FTRACE := -pg
766endif
767export CC_FLAGS_FTRACE
Steven Rostedta2546fa2011-02-09 13:15:59 -0500768ifdef CONFIG_HAVE_FENTRY
769CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
770endif
Heiko Carstensc0a80c02015-01-09 13:06:33 +0100771KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
Steven Rostedta2546fa2011-02-09 13:15:59 -0500772KBUILD_AFLAGS += $(CC_USING_FENTRY)
Steven Rostedt72441cb2010-10-13 17:12:30 -0400773ifdef CONFIG_DYNAMIC_FTRACE
Steven Rostedtcf4db252010-10-14 23:32:44 -0400774 ifdef CONFIG_HAVE_C_RECORDMCOUNT
Steven Rostedt72441cb2010-10-13 17:12:30 -0400775 BUILD_C_RECORDMCOUNT := y
776 export BUILD_C_RECORDMCOUNT
777 endif
778endif
Arnaldo Carvalho de Melo16444a82008-05-12 21:20:42 +0200779endif
780
Sam Ravnborg91341d42008-01-21 21:31:44 +0100781# We trigger additional mismatches with less inlining
782ifdef CONFIG_DEBUG_SECTION_MISMATCH
783KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
784endif
785
Masahiro Yamada90ad4052017-04-14 15:17:26 +0900786ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
787KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,)
788KBUILD_CFLAGS += $(call cc-option,-fdata-sections,)
789endif
790
Sam Ravnborge8e69932005-04-30 16:51:42 -0700791# arch Makefile may override CC so keep this after arch Makefile is included
Rik van Riele8f5bdb02005-05-16 21:53:46 -0700792NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
Sam Ravnborge8e69932005-04-30 16:51:42 -0700793CHECKFLAGS += $(NOSTDINC_FLAGS)
794
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795# warn about C99 declaration after statement
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200796KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200798# disable pointer signed / unsigned warnings in gcc 4.0
Michal Marek8417da6f2011-05-02 12:51:15 +0200799KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800
Kirill Smelkovfe8d0a42009-04-09 15:34:34 +0400801# disable invalid "can't wrap" optimizations for signed / pointers
Linus Torvaldsa1378022009-07-12 11:25:04 -0700802KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
Linus Torvaldsd0115552009-03-19 15:53:19 -0700803
Andi Kleen8f7f5c92009-09-18 12:49:37 -0700804# conserve stack if available
805KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
806
Sergei Trofimovich80970472013-09-13 14:51:40 -0700807# disallow errors like 'EXPORT_GPL(foo);' with missing header
808KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
809
810# require functions to have arguments in prototypes, not empty 'int foo()'
811KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
812
Josh Triplettfe7c36c2013-12-23 13:56:06 -0800813# Prohibit date/time macros, which would make the build non-deterministic
814KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
815
Daniel Wagnerea8daa72016-03-08 09:29:09 +0100816# enforce correct pointer usage
817KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
818
Kees Cookc834f0e2017-03-20 17:14:11 -0700819# Require designated initializers for all marked structures
820KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
821
Michal Marek40df7592011-04-20 13:45:30 +0200822# use the deterministic mode of AR if available
823KBUILD_ARFLAGS := $(call ar-option,D)
824
Masahiro Yamadaa436bb72015-03-27 20:43:36 +0900825include scripts/Makefile.kasan
826include scripts/Makefile.extrawarn
Andrey Ryabininc6d30852016-01-20 15:00:55 -0800827include scripts/Makefile.ubsan
Masahiro Yamadaa86fe352014-04-14 18:27:10 +0900828
Michal Marek61754c12015-07-01 17:19:30 +0200829# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
830# last assignments
831KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
832KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
833KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
Sam Ravnborg52bcc332007-10-15 22:03:58 +0200834
Roland McGrath18991192007-07-19 01:48:40 -0700835# Use --build-id when available.
Rabin Vincentbd743702017-04-30 18:16:00 +0200836LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\
Sam Ravnborgf86fd302009-09-19 10:14:33 +0200837 $(call cc-ldoption, -Wl$(comma)--build-id,))
Sam Ravnborg65881692010-07-28 17:33:09 +0200838KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
Roland McGrath18991192007-07-19 01:48:40 -0700839LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
840
Nicholas Pigginb67067f2016-08-24 22:29:20 +1000841ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
842LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
843endif
844
David Howells5d7d18f2009-03-04 11:59:07 -0800845ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
Andi Kleend79a2712009-09-16 22:36:55 +0200846LDFLAGS_vmlinux += $(call ld-option, -X,)
David Howells5d7d18f2009-03-04 11:59:07 -0800847endif
848
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849# Default kernel image to build when no specific target is given.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200850# KBUILD_IMAGE may be overruled on the command line or
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851# set in the environment
852# Also any assignments in arch/$(ARCH)/Makefile take precedence over
853# this default value
854export KBUILD_IMAGE ?= vmlinux
855
856#
857# INSTALL_PATH specifies where to place the updated kernel and system map
858# images. Default is /boot, but you can set it to other values
859export INSTALL_PATH ?= /boot
860
861#
Jason Cooperf4d4ffc2013-12-01 23:56:28 +0000862# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
863# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
864# an argument if needed. Otherwise it defaults to the kernel install path
865#
866export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
867
868#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
870# relocations required by build roots. This is not defined in the
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200871# makefile but the argument can be passed to make if needed.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872#
873
Sam Ravnborgdf9df032006-01-16 12:46:07 +0100874MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875export MODLIB
876
Theodore Ts'oac031f22006-06-21 20:53:09 -0400877#
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +0900878# INSTALL_MOD_STRIP, if defined, will cause modules to be
879# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
880# the default option --strip-debug will be used. Otherwise,
881# INSTALL_MOD_STRIP value will be used as the options to the strip command.
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100882
Theodore Ts'oac031f22006-06-21 20:53:09 -0400883ifdef INSTALL_MOD_STRIP
884ifeq ($(INSTALL_MOD_STRIP),1)
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100885mod_strip_cmd = $(STRIP) --strip-debug
Theodore Ts'oac031f22006-06-21 20:53:09 -0400886else
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100887mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
Theodore Ts'oac031f22006-06-21 20:53:09 -0400888endif # INSTALL_MOD_STRIP=1
889else
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100890mod_strip_cmd = true
Theodore Ts'oac031f22006-06-21 20:53:09 -0400891endif # INSTALL_MOD_STRIP
892export mod_strip_cmd
893
Bertrand Jacquinbeb50df2014-08-27 20:31:56 +0930894# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
895# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
896# or CONFIG_MODULE_COMPRESS_XZ.
897
898mod_compress_cmd = true
899ifdef CONFIG_MODULE_COMPRESS
900 ifdef CONFIG_MODULE_COMPRESS_GZIP
Jason A. Donenfeld3d1450d2015-07-07 20:26:07 +0200901 mod_compress_cmd = gzip -n -f
Bertrand Jacquinbeb50df2014-08-27 20:31:56 +0930902 endif # CONFIG_MODULE_COMPRESS_GZIP
903 ifdef CONFIG_MODULE_COMPRESS_XZ
Jason A. Donenfeld3d1450d2015-07-07 20:26:07 +0200904 mod_compress_cmd = xz -f
Bertrand Jacquinbeb50df2014-08-27 20:31:56 +0930905 endif # CONFIG_MODULE_COMPRESS_XZ
906endif # CONFIG_MODULE_COMPRESS
907export mod_compress_cmd
908
P J P1bf49dd2013-11-12 15:11:44 -0800909# Select initial ramdisk compression format, default is gzip(1).
910# This shall be used by the dracut(8) tool while creating an initramfs image.
911#
Jan Beulich7ac18152013-12-18 17:08:57 -0800912INITRD_COMPRESS-y := gzip
913INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
914INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
915INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
916INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
917INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
Linus Torvaldsb7000ad2013-12-20 16:52:45 -0800918# do not export INITRD_COMPRESS, since we didn't actually
919# choose a sane default compression above.
920# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921
Michal Marekd9d8d7e2013-01-25 13:41:31 +1030922ifdef CONFIG_MODULE_SIG_ALL
David Woodhouse3ee550f2015-08-14 16:17:16 +0100923$(eval $(call config_filename,MODULE_SIG_KEY))
924
925mod_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 +1030926else
927mod_sign_cmd = true
928endif
929export mod_sign_cmd
930
Josh Poimboeuf9f0c18a2017-02-15 12:21:17 -0600931ifdef CONFIG_STACK_VALIDATION
932 has_libelf := $(call try-run,\
933 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
934 ifeq ($(has_libelf),1)
935 objtool_target := tools/objtool FORCE
936 else
Josh Poimboeuf3dd40cb2017-10-03 20:10:36 -0500937 ifdef CONFIG_ORC_UNWINDER
938 $(error "Cannot generate ORC metadata for CONFIG_ORC_UNWINDER=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
939 else
940 $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
941 endif
Josh Poimboeuf9f0c18a2017-02-15 12:21:17 -0600942 SKIP_STACK_VALIDATION := 1
943 export SKIP_STACK_VALIDATION
944 endif
945endif
946
Rusty Russelle2a666d2012-10-19 11:53:15 +1030947
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948ifeq ($(KBUILD_EXTMOD),)
David Howellscfc411e2015-08-14 15:20:41 +0100949core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950
951vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
952 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
Feng Wu37d9fe42015-09-22 16:47:29 +0800953 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954
955vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
Feng Wu37d9fe42015-09-22 16:47:29 +0800956 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957
958init-y := $(patsubst %/, %/built-in.o, $(init-y))
959core-y := $(patsubst %/, %/built-in.o, $(core-y))
960drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
961net-y := $(patsubst %/, %/built-in.o, $(net-y))
962libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
Nicholas Piggin3a166fc2017-06-20 01:52:05 +1000963libs-y2 := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y)))
Feng Wu37d9fe42015-09-22 16:47:29 +0800964virt-y := $(patsubst %/, %/built-in.o, $(virt-y))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200966# Externally visible symbols (used by link-vmlinux.sh)
Sam Ravnborg95698572012-05-05 10:18:40 +0200967export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
Nicholas Piggin3a166fc2017-06-20 01:52:05 +1000968export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
969export KBUILD_VMLINUX_LIBS := $(libs-y1)
Sam Ravnborg95698572012-05-05 10:18:40 +0200970export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200971export LDFLAGS_vmlinux
Cao jin312a3d02017-08-02 10:31:06 +0800972# used by scripts/package/Makefile
Feng Wu37d9fe42015-09-22 16:47:29 +0800973export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974
Nicholas Piggin3a166fc2017-06-20 01:52:05 +1000975vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976
Nicolas Pitre2441e782016-04-22 15:25:00 -0400977# Include targets which we want to execute sequentially if the rest of the
978# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
979# evaluated more than once.
980PHONY += vmlinux_prereq
981vmlinux_prereq: $(vmlinux-deps) FORCE
David Woodhouse0f836e5f2006-10-11 01:21:43 -0700982ifdef CONFIG_HEADERS_CHECK
David Woodhouse0e7af8d042006-10-13 16:04:23 +0100983 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
David Woodhouse0f836e5f2006-10-11 01:21:43 -0700984endif
Jan Kiszka3ee7b3f2015-02-17 13:46:36 -0800985ifdef CONFIG_GDB_SCRIPTS
Masahiro Yamada8e9b4662017-08-20 15:04:11 +0900986 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
Jan Kiszka3ee7b3f2015-02-17 13:46:36 -0800987endif
Nicolas Pitre2441e782016-04-22 15:25:00 -0400988ifdef CONFIG_TRIM_UNUSED_KSYMS
Nicolas Ferreba79d402016-04-25 17:55:08 +0200989 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
Nicolas Pitre86556392016-12-02 15:11:50 -0500990 "$(MAKE) -f $(srctree)/Makefile vmlinux"
Nicolas Pitre2441e782016-04-22 15:25:00 -0400991endif
Nicolas Pitre23121ca2016-01-26 21:50:18 -0500992
993# standalone target for easier testing
994include/generated/autoksyms.h: FORCE
Nicolas Ferreba79d402016-04-25 17:55:08 +0200995 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
Nicolas Pitre23121ca2016-01-26 21:50:18 -0500996
Nicholas Pigginfbe6e372016-08-24 22:29:21 +1000997ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
998
999# Final link of vmlinux with optional arch pass after final link
Cao jin312a3d02017-08-02 10:31:06 +08001000cmd_link-vmlinux = \
1001 $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ; \
Nicholas Pigginfbe6e372016-08-24 22:29:21 +10001002 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
Nicolas Pitre2441e782016-04-22 15:25:00 -04001003
Nicolas Pitreedf69472016-04-26 16:48:44 -04001004vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +02001005 +$(call if_changed,link-vmlinux)
Sam Ravnborg741f98f2007-07-17 10:54:06 +02001006
Nicolas Pitredd924782016-02-28 22:00:00 -05001007# Build samples along the rest of the kernel
1008ifdef CONFIG_SAMPLES
1009vmlinux-dirs += samples
1010endif
1011
Masahiro Yamada38385f82014-04-28 16:26:18 +09001012# The actual objects are generated when descending,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013# make sure no implicit rule kicks in
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +02001014$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015
1016# Handle descending into subdirectories listed in $(vmlinux-dirs)
1017# Preset locale variables to speed up the build process. Limit locale
1018# tweaks to this spot to avoid wrong language settings when running
1019# make menuconfig etc.
1020# Error messages still appears in the original language
1021
Paul Smith4f193362006-03-05 17:14:10 -05001022PHONY += $(vmlinux-dirs)
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001023$(vmlinux-dirs): prepare scripts
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024 $(Q)$(MAKE) $(build)=$@
1025
Michal Marek0d0e7712013-07-11 15:34:51 +02001026define filechk_kernel.release
1027 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1028endef
1029
Geert Uytterhoeven83a35e32013-06-28 11:27:31 +02001030# Store (new) KERNELRELEASE string in include/config/kernel.release
Roman Zippelf1d28fb2006-06-08 22:12:43 -07001031include/config/kernel.release: include/config/auto.conf FORCE
Michal Marek0d0e7712013-07-11 15:34:51 +02001032 $(call filechk,kernel.release)
Sam Ravnborgcb584552006-01-09 21:20:34 +01001033
1034
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035# Things we need to do before we recursively start building the kernel
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001036# or the modules are listed in "prepare".
1037# A multi level approach is used. prepareN is processed before prepareN-1.
1038# archprepare is used in arch Makefiles and when processed asm symlink,
1039# version.h and scripts_basic is processed / created.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001041# Listed in dependency order
Paul Smith4f193362006-03-05 17:14:10 -05001042PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001043
Sam Ravnborg86feeaa2005-09-09 19:28:28 +02001044# prepare3 is used to check if we are building in a separate output directory,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045# and if so do:
1046# 1) Check that make has not been executed in the kernel src $(srctree)
Roman Zippelf1d28fb2006-06-08 22:12:43 -07001047prepare3: include/config/kernel.release
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048ifneq ($(KBUILD_SRC),)
Mike Frysingerfd54f502008-11-06 03:31:35 -05001049 @$(kecho) ' Using $(srctree) as source for kernel'
Roman Zippelc955cca2006-06-08 22:12:39 -07001050 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
Michal Marek5369f552012-07-07 23:04:40 +02001051 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1052 echo >&2 " in the '$(srctree)' directory.";\
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 /bin/false; \
1054 fi;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055endif
1056
Kees Cookc965b102016-07-26 15:21:17 -07001057# prepare2 creates a makefile if using a separate output directory.
1058# From this point forward, .config has been reprocessed, so any rules
1059# that need to depend on updated CONFIG_* values can be checked here.
1060prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061
David Howellsd183e6f2012-10-02 18:01:56 +01001062prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
Sam Ravnborgf7f16b72009-10-18 00:00:43 +02001063 include/config/auto.conf
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001064 $(cmd_crmodverdir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065
H. Peter Anvin6520fe52012-05-08 21:22:24 +03001066archprepare: archheaders archscripts prepare1 scripts_basic
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001067
Emese Revfy6b90bd42016-05-24 00:09:38 +02001068prepare0: archprepare gcc-plugins
Sam Ravnborg8d36a622005-09-10 21:05:36 +02001069 $(Q)$(MAKE) $(build)=.
Sam Ravnborg86feeaa2005-09-09 19:28:28 +02001070
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071# All the preparing..
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -06001072prepare: prepare0 prepare-objtool
1073
1074PHONY += prepare-objtool
Josh Poimboeuf3b27a0c2016-03-03 11:39:30 -06001075prepare-objtool: $(objtool_target)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076
Kees Cookc965b102016-07-26 15:21:17 -07001077# Check for CONFIG flags that require compiler support. Abort the build
1078# after .config has been processed, but before the kernel build starts.
1079#
1080# For security-sensitive CONFIG options, we don't want to fallback and/or
1081# silently change which compiler flags will be used, since that leads to
1082# producing kernels with different security feature characteristics
1083# depending on the compiler used. (For example, "But I selected
1084# CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1085PHONY += prepare-compiler-check
1086prepare-compiler-check: FORCE
1087# Make sure compiler supports requested stack protector flag.
1088ifdef stackp-name
1089 ifeq ($(call cc-option, $(stackp-flag)),)
1090 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1091 $(stackp-flag) not supported by compiler >&2 && exit 1
1092 endif
1093endif
1094# Make sure compiler does not have buggy stack-protector support.
1095ifdef stackp-check
1096 ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1097 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1098 $(stackp-flag) available but compiler is broken >&2 && exit 1
1099 endif
1100endif
1101 @:
1102
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103# Generate some files
1104# ---------------------------------------------------------------------------
1105
1106# KERNELRELEASE can change from a few different places, meaning version.h
1107# needs to be updated, so this check is forced on all builds
1108
1109uts_len := 64
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001110define filechk_utsrelease.h
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001112 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1113 exit 1; \
1114 fi; \
1115 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116endef
1117
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001118define filechk_version.h
Jesper Juhl450c6072012-02-16 22:49:15 +01001119 (echo \#define LINUX_VERSION_CODE $(shell \
1120 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001121 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1122endef
1123
David Howellsd183e6f2012-10-02 18:01:56 +01001124$(version_h): $(srctree)/Makefile FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125 $(call filechk,version.h)
Michal Marek223c24a2014-11-27 16:13:17 +01001126 $(Q)rm -f $(old_version_h)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127
Sam Ravnborg273b2812009-10-18 00:52:28 +02001128include/generated/utsrelease.h: include/config/kernel.release FORCE
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001129 $(call filechk,utsrelease.h)
1130
Vegard Nossum179efcb2008-12-16 12:33:43 +01001131PHONY += headerdep
1132headerdep:
Peter Foley9663d982011-04-26 17:17:11 -04001133 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1134 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
Vegard Nossum179efcb2008-12-16 12:33:43 +01001135
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136# ---------------------------------------------------------------------------
David Woodhouse8d730cf2006-06-18 11:58:39 +01001137# Kernel headers
David Woodhouse8d730cf2006-06-18 11:58:39 +01001138
Sam Ravnborge6883b12008-06-05 16:43:46 +02001139#Default location for installed headers
1140export INSTALL_HDR_PATH = $(objtree)/usr
1141
Masahiro Yamada0f042ee2017-07-10 03:32:34 +09001142# If we do an all arch process set dst to include/arch-$(hdr-arch)
Nicolas Dichtel61562f92017-03-27 14:20:16 +02001143hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(hdr-arch), dst=include)
Sam Ravnborge6883b12008-06-05 16:43:46 +02001144
H. Peter Anvin052ad272011-11-17 13:17:35 -08001145PHONY += archheaders
1146archheaders:
1147
H. Peter Anvin6520fe52012-05-08 21:22:24 +03001148PHONY += archscripts
1149archscripts:
1150
Sam Ravnborge6883b12008-06-05 16:43:46 +02001151PHONY += __headers
Masahiro Yamadaa9d9a402017-07-10 03:32:59 +09001152__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
Mike Waychisone1b702c2011-03-14 23:34:25 -07001153 $(Q)$(MAKE) $(build)=scripts build_unifdef
David Woodhouse6d716272006-09-24 22:16:03 +01001154
1155PHONY += headers_install_all
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001156headers_install_all:
1157 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
David Woodhouse6d716272006-09-24 22:16:03 +01001158
David Woodhouse8d730cf2006-06-18 11:58:39 +01001159PHONY += headers_install
Sam Ravnborge6883b12008-06-05 16:43:46 +02001160headers_install: __headers
David Howells10b63952012-10-02 18:01:57 +01001161 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1162 $(error Headers not exportable for the $(SRCARCH) architecture))
Masahiro Yamadaa8ff49a2017-07-10 03:32:35 +09001163 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
Nicolas Dichtel61562f92017-03-27 14:20:16 +02001164 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi $(hdr-dst)
David Woodhouse8d730cf2006-06-18 11:58:39 +01001165
Mike Frysinger1f857122007-02-14 00:33:02 -08001166PHONY += headers_check_all
1167headers_check_all: headers_install_all
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001168 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
Mike Frysinger1f857122007-02-14 00:33:02 -08001169
David Woodhouse68475352006-06-18 12:02:10 +01001170PHONY += headers_check
1171headers_check: headers_install
Masahiro Yamadaa8ff49a2017-07-10 03:32:35 +09001172 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
Masahiro Yamada05d8cba2017-05-16 14:15:03 +09001173 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi $(hdr-dst) HDRCHECK=1
David Woodhouse68475352006-06-18 12:02:10 +01001174
David Woodhouse8d730cf2006-06-18 11:58:39 +01001175# ---------------------------------------------------------------------------
Shuah Khan5a5da782014-08-07 13:07:46 -06001176# Kernel selftest
1177
1178PHONY += kselftest
1179kselftest:
Shuah Khan2bc84522017-09-06 16:44:35 -06001180 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
Shuah Khan5a5da782014-08-07 13:07:46 -06001181
Shuah Khan801d2e92017-08-18 15:54:41 -06001182PHONY += kselftest-clean
Wang Longdcb825a2015-10-08 02:41:18 +00001183kselftest-clean:
Shuah Khan2bc84522017-09-06 16:44:35 -06001184 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
Wang Longdcb825a2015-10-08 02:41:18 +00001185
Bamvor Jian Zhang3d6dee72016-01-08 15:27:34 +08001186PHONY += kselftest-merge
1187kselftest-merge:
1188 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1189 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1190 -m $(objtree)/.config \
1191 $(srctree)/tools/testing/selftests/*/config
1192 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1193
Shuah Khan5a5da782014-08-07 13:07:46 -06001194# ---------------------------------------------------------------------------
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195# Modules
1196
1197ifdef CONFIG_MODULES
1198
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001199# By default, build modules as well
Linus Torvalds1da177e2005-04-16 15:20:36 -07001200
Michal Marek73d13932010-03-10 12:28:58 +01001201all: modules
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +09001203# Build modules
Tejun Heo551559e2007-12-07 21:04:30 +09001204#
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +09001205# A module can be listed more than once in obj-m resulting in
1206# duplicate lines in modules.order files. Those are removed
1207# using awk while concatenating to the final file.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001208
Paul Smith4f193362006-03-05 17:14:10 -05001209PHONY += modules
Michal Marek2da30e72010-06-07 22:22:12 +02001210modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
Tejun Heo551559e2007-12-07 21:04:30 +09001211 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
Mike Frysingerfd54f502008-11-06 03:31:35 -05001212 @$(kecho) ' Building modules, stage 2.';
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001213 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214
Michal Mareka6c36632010-03-08 10:07:12 +01001215modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1216 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1217
Michal Marek73d13932010-03-10 12:28:58 +01001218%/modules.builtin: include/config/auto.conf
Michal Mareka6c36632010-03-08 10:07:12 +01001219 $(Q)$(MAKE) $(modbuiltin)=$*
1220
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221
1222# Target to prepare building external modules
Paul Smith4f193362006-03-05 17:14:10 -05001223PHONY += modules_prepare
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001224modules_prepare: prepare scripts
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225
1226# Target to install modules
Paul Smith4f193362006-03-05 17:14:10 -05001227PHONY += modules_install
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228modules_install: _modinst_ _modinst_post
1229
Paul Smith4f193362006-03-05 17:14:10 -05001230PHONY += _modinst_
Michal Marek2da30e72010-06-07 22:22:12 +02001231_modinst_:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232 @rm -rf $(MODLIB)/kernel
1233 @rm -f $(MODLIB)/source
1234 @mkdir -p $(MODLIB)/kernel
Masahiro Yamada8e9b4662017-08-20 15:04:11 +09001235 @ln -s $(abspath $(srctree)) $(MODLIB)/source
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1237 rm -f $(MODLIB)/build ; \
Michal Marek7e1c0472014-04-25 17:29:45 +02001238 ln -s $(CURDIR) $(MODLIB)/build ; \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239 fi
Tejun Heo551559e2007-12-07 21:04:30 +09001240 @cp -f $(objtree)/modules.order $(MODLIB)/
Michal Marekbc081dd2009-12-07 16:38:33 +01001241 @cp -f $(objtree)/modules.builtin $(MODLIB)/
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001242 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001244# This depmod is only for convenience to give the initial
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245# boot a modules.dep even before / is mounted read-write. However the
1246# boot script depmod is the master version.
Paul Smith4f193362006-03-05 17:14:10 -05001247PHONY += _modinst_post
Linus Torvalds6d128e12013-07-10 19:02:51 -07001248_modinst_post: _modinst_
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001249 $(call cmd,depmod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250
Josh Boyerd890f512012-11-05 09:09:24 +10301251ifeq ($(CONFIG_MODULE_SIG), y)
1252PHONY += modules_sign
1253modules_sign:
1254 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1255endif
1256
Linus Torvalds1da177e2005-04-16 15:20:36 -07001257else # CONFIG_MODULES
1258
1259# Modules not configured
1260# ---------------------------------------------------------------------------
1261
Masahiro Yamada612e47c2016-03-13 09:39:22 +09001262PHONY += modules modules_install
1263modules modules_install:
Michal Marek5369f552012-07-07 23:04:40 +02001264 @echo >&2
1265 @echo >&2 "The present kernel configuration has modules disabled."
1266 @echo >&2 "Type 'make config' and enable loadable module support."
1267 @echo >&2 "Then build a kernel with module support enabled."
1268 @echo >&2
Linus Torvalds1da177e2005-04-16 15:20:36 -07001269 @exit 1
1270
1271endif # CONFIG_MODULES
1272
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273###
1274# Cleaning is done on three levels.
1275# make clean Delete most generated files
1276# Leave enough to build external modules
1277# make mrproper Delete the current configuration, and all generated files
1278# make distclean Remove editor backup files, patch leftover files and the like
1279
1280# Directories & files removed with 'make clean'
1281CLEAN_DIRS += $(MODVERDIR)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001282
1283# Directories & files removed with 'make mrproper'
Sam Ravnborgd8ecc5c2011-04-27 22:29:49 +02001284MRPROPER_DIRS += include/config usr/include include/generated \
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +09001285 arch/*/include/generated .tmp_objdiff
Masahiro Yamadac22bd32c2015-01-08 17:29:38 +09001286MRPROPER_FILES += .config .config.old .version .old_version \
Rusty Russelld5b71932012-10-02 14:35:24 +09301287 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
David Woodhousefb117942015-07-20 21:16:30 +01001288 signing_key.pem signing_key.priv signing_key.x509 \
1289 x509.genkey extra_certificates signing_key.x509.keyid \
Jan Kiszka3ee7b3f2015-02-17 13:46:36 -08001290 signing_key.x509.signer vmlinux-gdb.py
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291
1292# clean - Delete most, but leave enough to build external modules
1293#
1294clean: rm-dirs := $(CLEAN_DIRS)
1295clean: rm-files := $(CLEAN_FILES)
Gerard Snitselaarfb68d4b2012-02-04 02:55:59 -07001296clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297
Pawel Mollbd1ee802012-10-29 11:23:02 +00001298PHONY += $(clean-dirs) clean archclean vmlinuxclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299$(clean-dirs):
1300 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1301
Pawel Mollbd1ee802012-10-29 11:23:02 +00001302vmlinuxclean:
1303 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
Nicholas Pigginfbe6e372016-08-24 22:29:21 +10001304 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
Pawel Mollbd1ee802012-10-29 11:23:02 +00001305
1306clean: archclean vmlinuxclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307
1308# mrproper - Delete all generated files, including .config
1309#
1310mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1311mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
Mauro Carvalho Chehabcb43fb52017-05-14 11:50:01 -03001312mrproper-dirs := $(addprefix _mrproper_,scripts)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313
Paul Smith4f193362006-03-05 17:14:10 -05001314PHONY += $(mrproper-dirs) mrproper archmrproper
Linus Torvalds1da177e2005-04-16 15:20:36 -07001315$(mrproper-dirs):
1316 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1317
1318mrproper: clean archmrproper $(mrproper-dirs)
1319 $(call cmd,rmdirs)
1320 $(call cmd,rmfiles)
1321
1322# distclean
1323#
Paul Smith4f193362006-03-05 17:14:10 -05001324PHONY += distclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325
1326distclean: mrproper
1327 @find $(srctree) $(RCS_FIND_IGNORE) \
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001328 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
Masahiro Yamadaf78271d2017-01-22 23:02:32 +09001329 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1330 -o -name 'core' \) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331 -type f -print | xargs rm -f
1332
1333
1334# Packaging of the kernel to various formats
1335# ---------------------------------------------------------------------------
1336# rpm target kept for backward compatibility
Michal Marekc79624c2014-07-04 22:53:52 +02001337package-dir := scripts/package
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338
Arnaldo Carvalho de Melobafb6742010-06-07 07:44:25 -03001339%src-pkg: FORCE
1340 $(Q)$(MAKE) $(build)=$(package-dir) $@
Zach Brown031ecc62006-06-08 22:12:37 -07001341%pkg: include/config/kernel.release FORCE
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001342 $(Q)$(MAKE) $(build)=$(package-dir) $@
Zach Brown031ecc62006-06-08 22:12:37 -07001343rpm: include/config/kernel.release FORCE
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001344 $(Q)$(MAKE) $(build)=$(package-dir) $@
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345
1346
1347# Brief documentation of the typical targets used
1348# ---------------------------------------------------------------------------
1349
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001350boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
Konstantin Khlebnikova1e7b7b2014-10-28 17:18:20 +04001351boards := $(sort $(notdir $(boards)))
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001352board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1353board-dirs := $(sort $(notdir $(board-dirs:/=)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354
Masahiro Yamadafe69b422016-03-13 09:39:55 +09001355PHONY += help
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356help:
1357 @echo 'Cleaning targets:'
Samuel Tardieu5ea084e2006-12-12 19:09:40 +01001358 @echo ' clean - Remove most generated files but keep the config and'
Jesper Juhl5cc8d242006-09-24 14:01:08 +02001359 @echo ' enough build support to build external modules'
Samuel Tardieu5ea084e2006-12-12 19:09:40 +01001360 @echo ' mrproper - Remove all generated files + config + various backup files'
Jesper Juhl5cc8d242006-09-24 14:01:08 +02001361 @echo ' distclean - mrproper + remove editor backup and patch files'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362 @echo ''
1363 @echo 'Configuration targets:'
1364 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1365 @echo ''
1366 @echo 'Other generic targets:'
1367 @echo ' all - Build all targets marked with [*]'
1368 @echo '* vmlinux - Build the bare kernel'
1369 @echo '* modules - Build all modules'
Bodo Eggert9cc5d742005-11-23 20:11:34 +01001370 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371 @echo ' dir/ - Build all files in dir and below'
Wang YanQing40ab87a2015-12-11 00:35:19 +08001372 @echo ' dir/file.[ois] - Build specified target only'
Vinícius Tinti433db3e2017-04-24 13:04:58 -07001373 @echo ' dir/file.ll - Build the LLVM assembly file'
1374 @echo ' (requires compiler support for LLVM assembly generation)'
Joe Perches62718972010-01-13 09:31:44 -08001375 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1376 @echo ' (requires a recent binutils and recent build (System.map))'
Sam Ravnborg155ad602005-07-07 17:56:08 -07001377 @echo ' dir/file.ko - Build module including final link'
Robert P. J. Dayc4d5ee62009-04-24 12:35:23 -04001378 @echo ' modules_prepare - Set up for building external modules'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379 @echo ' tags/TAGS - Generate tags file for editors'
1380 @echo ' cscope - Generate cscope index'
Jianbin Kangf4ed1002011-01-14 20:07:05 +08001381 @echo ' gtags - Generate GNU GLOBAL index'
Michal Marek3f1d9a62014-07-11 15:57:24 +02001382 @echo ' kernelrelease - Output the release version string (use with make -s)'
1383 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1384 @echo ' image_name - Output the image name (use with make -s)'
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001385 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
Geert Uytterhoeven59df3232007-01-29 13:47:01 +01001386 echo ' (default: $(INSTALL_HDR_PATH))'; \
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001387 echo ''
Randy Dunlap31b8cc82017-05-08 15:55:08 -07001388 @echo 'Static analysers:'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001389 @echo ' checkstack - Generate a list of stack hogs'
1390 @echo ' namespacecheck - Name space analysis on compiled kernel'
Sam Ravnborgaa025e72007-11-14 21:34:55 +01001391 @echo ' versioncheck - Sanity check on version.h usage'
Randy Dunlapec2d9872007-11-04 12:01:55 -08001392 @echo ' includecheck - Check for duplicate included header files'
Adrian Bunk295ac052007-08-24 23:04:56 +02001393 @echo ' export_report - List the usages of all exported symbols'
Vegard Nossum179efcb2008-12-16 12:33:43 +01001394 @echo ' headers_check - Sanity check on exported headers'
Nicolas Palix74425ee2010-06-06 17:15:01 +02001395 @echo ' headerdep - Detect inclusion cycles in headers'
1396 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1397 @echo ''
Randy Dunlap31b8cc82017-05-08 15:55:08 -07001398 @echo 'Kernel selftest:'
Shuah Khan5a5da782014-08-07 13:07:46 -06001399 @echo ' kselftest - Build and run kernel selftest (run as root)'
1400 @echo ' Build, install, and boot kernel before'
1401 @echo ' running kselftest on it'
Wang Longdcb825a2015-10-08 02:41:18 +00001402 @echo ' kselftest-clean - Remove all generated kselftest files'
Bamvor Jian Zhang3d6dee72016-01-08 15:27:34 +08001403 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existed'
1404 @echo ' .config.'
Shuah Khan5a5da782014-08-07 13:07:46 -06001405 @echo ''
Randy Dunlap31b8cc82017-05-08 15:55:08 -07001406 @echo 'Userspace tools targets:'
1407 @echo ' use "make tools/help"'
1408 @echo ' or "cd tools; make help"'
1409 @echo ''
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410 @echo 'Kernel packaging:'
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001411 @$(MAKE) $(build)=$(package-dir) help
Linus Torvalds1da177e2005-04-16 15:20:36 -07001412 @echo ''
1413 @echo 'Documentation targets:'
Mauro Carvalho Chehabcb43fb52017-05-14 11:50:01 -03001414 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
Linus Torvalds1da177e2005-04-16 15:20:36 -07001415 @echo ''
Andres Salomon01dee182008-04-25 22:34:58 -04001416 @echo 'Architecture specific targets ($(SRCARCH)):'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417 @$(if $(archhelp),$(archhelp),\
Andres Salomon01dee182008-04-25 22:34:58 -04001418 echo ' No architecture specific help defined for $(SRCARCH)')
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419 @echo ''
1420 @$(if $(boards), \
1421 $(foreach b, $(boards), \
1422 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1423 echo '')
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001424 @$(if $(board-dirs), \
1425 $(foreach b, $(board-dirs), \
1426 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1427 printf " %-16s - Show all of the above\\n" help-boards; \
1428 echo '')
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429
1430 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
Sam Ravnborg45d506b2006-08-08 21:35:14 +02001431 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001432 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
Cao jin9ba26a72017-06-06 17:07:53 +08001433 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)'
Dustin Kirkland701842e2006-05-23 15:57:23 -05001434 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
Ingo Molnaraf07ce32011-06-16 13:26:23 +02001435 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
Sam Ravnborg28bc20d2011-04-27 22:15:27 +02001436 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1437 @echo ' 1: warnings which may be relevant and do not occur too often'
1438 @echo ' 2: warnings which occur quite often but may still be relevant'
1439 @echo ' 3: more obscure warnings, can most likely be ignored'
Michal Mareka6de5532011-04-29 14:45:31 +02001440 @echo ' Multiple levels can be combined with W=12 or W=123'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001441 @echo ''
1442 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1443 @echo 'For further info see the ./README file'
1444
1445
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001446help-board-dirs := $(addprefix help-,$(board-dirs))
1447
1448help-boards: $(help-board-dirs)
1449
Michal Marekfbae4d52014-11-28 13:31:43 +01001450boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001451
1452$(help-board-dirs): help-%:
1453 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1454 @$(if $(boards-per-dir), \
1455 $(foreach b, $(boards-per-dir), \
1456 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1457 echo '')
1458
1459
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460# Documentation targets
1461# ---------------------------------------------------------------------------
Mauro Carvalho Chehab18afab82017-07-17 18:46:35 -03001462DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs linkcheckdocs
Jani Nikula22cba312016-05-19 15:14:05 +03001463PHONY += $(DOC_TARGETS)
1464$(DOC_TARGETS): scripts_basic FORCE
Mauro Carvalho Chehabcb43fb52017-05-14 11:50:01 -03001465 $(Q)$(MAKE) $(build)=Documentation $@
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466
1467else # KBUILD_EXTMOD
1468
1469###
1470# External module support.
1471# When building external modules the kernel used as basis is considered
1472# read-only, and no consistency checks are made and the make
1473# system is not used on the basis kernel. If updates are required
1474# in the basis kernel ordinary make commands (without M=...) must
1475# be used.
1476#
1477# The following are the only valid targets when building external
1478# modules.
1479# make M=dir clean Delete all automatically generated files
1480# make M=dir modules Make all modules in specified dir
1481# make M=dir Same as 'make M=dir modules'
1482# make M=dir modules_install
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001483# Install the modules built in the module directory
Linus Torvalds1da177e2005-04-16 15:20:36 -07001484# Assumes install directory is already created
1485
1486# We are always building modules
1487KBUILD_MODULES := 1
Paul Smith4f193362006-03-05 17:14:10 -05001488PHONY += crmodverdir
Linus Torvalds1da177e2005-04-16 15:20:36 -07001489crmodverdir:
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001490 $(cmd_crmodverdir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491
Paul Smith4f193362006-03-05 17:14:10 -05001492PHONY += $(objtree)/Module.symvers
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493$(objtree)/Module.symvers:
1494 @test -e $(objtree)/Module.symvers || ( \
1495 echo; \
1496 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1497 echo " is missing; modules will have no dependencies and modversions."; \
1498 echo )
1499
1500module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
Paul Smith4f193362006-03-05 17:14:10 -05001501PHONY += $(module-dirs) modules
Linus Torvalds1da177e2005-04-16 15:20:36 -07001502$(module-dirs): crmodverdir $(objtree)/Module.symvers
1503 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1504
1505modules: $(module-dirs)
Mike Frysingerfd54f502008-11-06 03:31:35 -05001506 @$(kecho) ' Building modules, stage 2.';
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001507 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508
Paul Smith4f193362006-03-05 17:14:10 -05001509PHONY += modules_install
Sam Ravnborga67dc212006-01-28 23:51:57 +01001510modules_install: _emodinst_ _emodinst_post
Adrian Bunke6304662006-02-14 15:58:15 +01001511
Paul Smith4f193362006-03-05 17:14:10 -05001512install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1513PHONY += _emodinst_
Sam Ravnborga67dc212006-01-28 23:51:57 +01001514_emodinst_:
Sam Ravnborga67dc212006-01-28 23:51:57 +01001515 $(Q)mkdir -p $(MODLIB)/$(install-dir)
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001516 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517
Paul Smith4f193362006-03-05 17:14:10 -05001518PHONY += _emodinst_post
Sam Ravnborga67dc212006-01-28 23:51:57 +01001519_emodinst_post: _emodinst_
1520 $(call cmd,depmod)
1521
Linus Torvalds1da177e2005-04-16 15:20:36 -07001522clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1523
Paul Smith4f193362006-03-05 17:14:10 -05001524PHONY += $(clean-dirs) clean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001525$(clean-dirs):
1526 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1527
1528clean: rm-dirs := $(MODVERDIR)
Michal Marek88d7be02010-09-06 12:00:08 +02001529clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
Linus Torvalds1da177e2005-04-16 15:20:36 -07001530
Masahiro Yamadafe69b422016-03-13 09:39:55 +09001531PHONY += help
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532help:
1533 @echo ' Building external modules.'
1534 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1535 @echo ''
1536 @echo ' modules - default target, build the module(s)'
1537 @echo ' modules_install - install the module'
1538 @echo ' clean - remove generated files in module directory only'
1539 @echo ''
Sam Ravnborg06300b22006-01-25 07:13:18 +01001540
1541# Dummies...
Paul Smith4f193362006-03-05 17:14:10 -05001542PHONY += prepare scripts
Sam Ravnborg06300b22006-01-25 07:13:18 +01001543prepare: ;
1544scripts: ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001545endif # KBUILD_EXTMOD
1546
Michal Marek88d7be02010-09-06 12:00:08 +02001547clean: $(clean-dirs)
1548 $(call cmd,rmdirs)
1549 $(call cmd,rmfiles)
Kevin Cernekee43f67c92011-05-10 15:47:16 -07001550 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
Michal Marek88d7be02010-09-06 12:00:08 +02001551 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
David Howellsaddbcdb2012-09-26 10:09:50 +01001552 -o -name '*.ko.*' \
Andi Kleen866ced92014-07-30 20:50:18 +02001553 -o -name '*.dwo' \
Rasmus Villemoesd523b252015-08-20 11:53:29 +02001554 -o -name '*.su' \
Michal Marek88d7be02010-09-06 12:00:08 +02001555 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1556 -o -name '*.symtypes' -o -name 'modules.order' \
1557 -o -name modules.builtin -o -name '.tmp_*.o.*' \
Emese Revfy6b90bd42016-05-24 00:09:38 +02001558 -o -name '*.c.[012]*.*' \
Vinícius Tinti433db3e2017-04-24 13:04:58 -07001559 -o -name '*.ll' \
Michal Marek88d7be02010-09-06 12:00:08 +02001560 -o -name '*.gcno' \) -type f -print | xargs rm -f
1561
Linus Torvalds1da177e2005-04-16 15:20:36 -07001562# Generate tags for editors
1563# ---------------------------------------------------------------------------
Sam Ravnborga680eed2008-12-03 22:24:13 +01001564quiet_cmd_tags = GEN $@
1565 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
Linus Torvalds1da177e2005-04-16 15:20:36 -07001566
Jianbin Kangf4ed1002011-01-14 20:07:05 +08001567tags TAGS cscope gtags: FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001568 $(call cmd,tags)
1569
Linus Torvalds1da177e2005-04-16 15:20:36 -07001570# Scripts to check various things for consistency
1571# ---------------------------------------------------------------------------
1572
Peter Foley279f3dd2011-04-26 17:15:01 -04001573PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1574
Linus Torvalds1da177e2005-04-16 15:20:36 -07001575includecheck:
Peter Foley436f8762011-04-26 17:18:29 -04001576 find $(srctree)/* $(RCS_FIND_IGNORE) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001577 -name '*.[hcS]' -type f -print | sort \
Geert Uytterhoeven80007432007-11-05 11:51:44 +01001578 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
Linus Torvalds1da177e2005-04-16 15:20:36 -07001579
1580versioncheck:
Peter Foley2ee2d292011-04-26 17:19:28 -04001581 find $(srctree)/* $(RCS_FIND_IGNORE) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001582 -name '*.[hcS]' -type f -print | sort \
Geert Uytterhoeven80007432007-11-05 11:51:44 +01001583 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
Linus Torvalds1da177e2005-04-16 15:20:36 -07001584
Nicolas Palix74425ee2010-06-06 17:15:01 +02001585coccicheck:
1586 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1587
Linus Torvalds1da177e2005-04-16 15:20:36 -07001588namespacecheck:
1589 $(PERL) $(srctree)/scripts/namespace.pl
1590
Adrian Bunk295ac052007-08-24 23:04:56 +02001591export_report:
1592 $(PERL) $(srctree)/scripts/export_report.pl
1593
Linus Torvalds1da177e2005-04-16 15:20:36 -07001594endif #ifeq ($(config-targets),1)
1595endif #ifeq ($(mixed-targets),1)
1596
Mike Marciniszync398ff02013-06-24 08:48:37 -04001597PHONY += checkstack kernelrelease kernelversion image_name
Jeff Dikee3ccf6e2006-09-27 01:50:37 -07001598
Jeff Dike011e3a92006-12-13 00:34:12 -08001599# UML needs a little special treatment here. It wants to use the host
1600# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1601# else wants $(ARCH), including people doing cross-builds, which means
1602# that $(SUBARCH) doesn't work here.
1603ifeq ($(ARCH), um)
1604CHECKSTACK_ARCH := $(SUBARCH)
1605else
1606CHECKSTACK_ARCH := $(ARCH)
1607endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001608checkstack:
1609 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
Jeff Dike011e3a92006-12-13 00:34:12 -08001610 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001611
Amerigo Wang7b8ea532010-08-20 05:36:06 -04001612kernelrelease:
1613 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
Amerigo Wang01ab1782010-06-28 10:45:21 +08001614
Sam Ravnborgcb584552006-01-09 21:20:34 +01001615kernelversion:
Sam Ravnborg2244cbd2006-01-16 12:12:12 +01001616 @echo $(KERNELVERSION)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001617
Mike Marciniszync398ff02013-06-24 08:48:37 -04001618image_name:
1619 @echo $(KBUILD_IMAGE)
1620
Borislav Petkovea01fa92012-04-11 18:36:18 +02001621# Clear a bunch of variables before executing the submake
1622tools/: FORCE
David Howellsbf351822012-11-05 21:02:08 +00001623 $(Q)mkdir -p $(objtree)/tools
Masahiro Yamada8e9b4662017-08-20 15:04:11 +09001624 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
Borislav Petkovea01fa92012-04-11 18:36:18 +02001625
1626tools/%: FORCE
David Howellsbf351822012-11-05 21:02:08 +00001627 $(Q)mkdir -p $(objtree)/tools
Masahiro Yamada8e9b4662017-08-20 15:04:11 +09001628 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
Borislav Petkovea01fa92012-04-11 18:36:18 +02001629
Sam Ravnborg06300b22006-01-25 07:13:18 +01001630# Single targets
1631# ---------------------------------------------------------------------------
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001632# Single targets are compatible with:
Robert P. J. Daye1b85132008-02-03 15:14:02 +02001633# - build with mixed source and output
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001634# - build with separate output dir 'make O=...'
1635# - external modules
1636#
1637# target-dir => where to store outputfile
1638# build-dir => directory in kernel source tree to use
Sam Ravnborg06300b22006-01-25 07:13:18 +01001639
Sam Ravnborg06300b22006-01-25 07:13:18 +01001640ifeq ($(KBUILD_EXTMOD),)
Sam Ravnborgaa360872006-04-06 08:25:31 +02001641 build-dir = $(patsubst %/,%,$(dir $@))
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001642 target-dir = $(dir $@)
Sam Ravnborg06300b22006-01-25 07:13:18 +01001643else
1644 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001645 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1646 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
Sam Ravnborg06300b22006-01-25 07:13:18 +01001647endif
1648
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001649%.s: %.c prepare scripts FORCE
1650 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1651%.i: %.c prepare scripts FORCE
1652 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1653%.o: %.c prepare scripts FORCE
1654 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1655%.lst: %.c prepare scripts FORCE
1656 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1657%.s: %.S prepare scripts FORCE
1658 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1659%.o: %.S prepare scripts FORCE
1660 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
Andreas Gruenbacher15fde672006-05-09 20:37:30 +02001661%.symtypes: %.c prepare scripts FORCE
1662 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
Vinícius Tinti433db3e2017-04-24 13:04:58 -07001663%.ll: %.c prepare scripts FORCE
1664 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001665
1666# Modules
Sam Ravnborg31110eb2008-12-13 23:00:45 +01001667/: prepare scripts FORCE
1668 $(cmd_crmodverdir)
1669 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1670 $(build)=$(build-dir)
Peter Foley8e2faea2014-09-25 11:23:58 -07001671# Make sure the latest headers are built for Documentation
Arnd Bergmannddea05f2016-07-04 16:39:35 +02001672Documentation/ samples/: headers_install
Sam Ravnborg31110eb2008-12-13 23:00:45 +01001673%/: prepare scripts FORCE
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001674 $(cmd_crmodverdir)
Sam Ravnborg06300b22006-01-25 07:13:18 +01001675 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001676 $(build)=$(build-dir)
1677%.ko: prepare scripts FORCE
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001678 $(cmd_crmodverdir)
Sam Ravnborg06300b22006-01-25 07:13:18 +01001679 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001680 $(build)=$(build-dir) $(@:.ko=.o)
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001681 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
Sam Ravnborg06300b22006-01-25 07:13:18 +01001682
Masahiro Yamada38385f82014-04-28 16:26:18 +09001683# FIXME Should go into a make.lib or something
Linus Torvalds1da177e2005-04-16 15:20:36 -07001684# ===========================================================================
1685
1686quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1687 cmd_rmdirs = rm -rf $(rm-dirs)
1688
1689quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1690 cmd_rmfiles = rm -f $(rm-files)
1691
Uwe Kleine-Königbc3c26f2008-04-21 22:53:56 +00001692# Run depmod only if we have System.map and depmod is executable
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001693quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
Michal Marek569658d2011-06-15 22:15:47 +02001694 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
Rusty Russellb92021b2013-03-15 15:04:17 +10301695 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001696
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001697# Create temporary dir for module support files
Sam Ravnborgab19f872007-10-22 11:23:07 +02001698# clean it up only when building all modules
1699cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1700 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001701
Linus Torvalds1da177e2005-04-16 15:20:36 -07001702# read all saved command lines
1703
1704targets := $(wildcard $(sort $(targets)))
1705cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1706
1707ifneq ($(cmd_files),)
1708 $(cmd_files): ; # Do not try to update included dependency files
1709 include $(cmd_files)
1710endif
1711
Linus Torvalds1da177e2005-04-16 15:20:36 -07001712endif # skip-makefile
1713
Paul Smith4f193362006-03-05 17:14:10 -05001714PHONY += FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001715FORCE:
Paul Smith4f193362006-03-05 17:14:10 -05001716
Paul Smith4f193362006-03-05 17:14:10 -05001717# Declare the contents of the .PHONY variable as phony. We keep that
Kirill Smelkovfe8d0a42009-04-09 15:34:34 +04001718# information in a variable so we can use it in if_changed and friends.
Paul Smith4f193362006-03-05 17:14:10 -05001719.PHONY: $(PHONY)