blob: 7466de60ddc7ab98c66c7a28f3cd4a502f465411 [file] [log] [blame]
Linus Torvaldsc517d832015-02-22 18:21:14 -08001VERSION = 4
Linus Torvaldsf55532a2016-03-26 16:03:24 -07002PATCHLEVEL = 6
Linus Torvalds55922c92011-05-29 17:43:36 -07003SUBLEVEL = 0
Linus Torvalds04974df2016-05-01 15:52:31 -07004EXTRAVERSION = -rc6
5NAME = Charred Weasel
Linus Torvalds1da177e2005-04-16 15:20:36 -07006
7# *DOCUMENTATION*
8# To see a list of typical targets execute "make help"
9# More info can be located in ./README
10# Comments in this file are targeted only to the developer, do not
11# expect to learn how to build the kernel reading this file.
12
Masahiro Yamadaa436bb72015-03-27 20:43:36 +090013# o Do not use make's built-in rules and variables
14# (this increases performance and avoids hard-to-debug behaviour);
15# o Look for make include files relative to root of kernel src
16MAKEFLAGS += -rR --include-dir=$(CURDIR)
Linus Torvalds1da177e2005-04-16 15:20:36 -070017
H. Peter Anvinc0513462009-12-17 06:56:11 -080018# Avoid funny character set dependencies
H. Peter Anvin06b5dc62009-12-17 15:51:37 -080019unexport LC_ALL
H. Peter Anvinc0513462009-12-17 06:56:11 -080020LC_COLLATE=C
21LC_NUMERIC=C
Michal Marek07105202010-01-08 12:25:37 +010022export LC_COLLATE LC_NUMERIC
H. Peter Anvinc0513462009-12-17 06:56:11 -080023
Borislav Petkovab7474e2013-11-11 15:27:43 +010024# Avoid interference with shell env settings
25unexport GREP_OPTIONS
26
Linus Torvalds1da177e2005-04-16 15:20:36 -070027# We are using a recursive build, so we need to do a little thinking
28# to get the ordering right.
29#
30# Most importantly: sub-Makefiles should only ever modify files in
31# their own directory. If in some directory we have a dependency on
32# a file in another dir (which doesn't happen often, but it's often
33# unavoidable when linking the built-in.o targets which finally
34# turn into vmlinux), we will call a sub make in that other dir, and
35# after that we are sure that everything which is in that other dir
36# is now up to date.
37#
38# The only cases where we need to modify files which have global
39# effects are thus separated out and done before the recursive
40# descending is started. They are now explicitly listed as the
41# prepare rule.
42
Michal Marek066b7ed2014-07-04 14:29:30 +020043# Beautify output
44# ---------------------------------------------------------------------------
45#
46# Normally, we echo the whole command before executing it. By making
47# that echo $($(quiet)$(cmd)), we now have the possibility to set
48# $(quiet) to choose other forms of output instead, e.g.
49#
50# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
51# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
52#
53# If $(quiet) is empty, the whole command will be printed.
54# If it is set to "quiet_", only the short version will be printed.
55# If it is set to "silent_", nothing will be printed at all, since
56# the variable $(silent_cmd_cc_o_c) doesn't exist.
57#
58# A simple variant is to prefix commands with $(Q) - that's useful
59# for commands that shall be hidden in non-verbose mode.
60#
61# $(Q)ln $@ :<
62#
63# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
64# If KBUILD_VERBOSE equals 1 then the above command is displayed.
65#
Linus Torvalds1da177e2005-04-16 15:20:36 -070066# To put more focus on warnings, be less verbose as default
67# Use 'make V=1' to see the full commands
68
Cheng Renquanb8b06182009-05-26 16:03:07 +080069ifeq ("$(origin V)", "command line")
70 KBUILD_VERBOSE = $(V)
Linus Torvalds1da177e2005-04-16 15:20:36 -070071endif
72ifndef KBUILD_VERBOSE
73 KBUILD_VERBOSE = 0
74endif
75
Michal Marek066b7ed2014-07-04 14:29:30 +020076ifeq ($(KBUILD_VERBOSE),1)
77 quiet =
78 Q =
79else
80 quiet=quiet_
81 Q = @
82endif
83
84# If the user is running make -s (silent mode), suppress echoing of
85# commands
86
87ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
88ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
89 quiet=silent_
90endif
91else # make-3.8x
92ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
93 quiet=silent_
94endif
95endif
96
97export quiet Q KBUILD_VERBOSE
98
Linus Torvalds1da177e2005-04-16 15:20:36 -070099# kbuild supports saving output files in a separate directory.
100# To locate output files in a separate directory two syntaxes are supported.
101# In both cases the working directory must be the root of the kernel src.
102# 1) O=
103# Use "make O=dir/to/store/output/files/"
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200104#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105# 2) Set KBUILD_OUTPUT
106# Set the environment variable KBUILD_OUTPUT to point to the directory
107# where the output files shall be placed.
108# export KBUILD_OUTPUT=dir/to/store/output/files/
109# make
110#
111# The O= assignment takes precedence over the KBUILD_OUTPUT environment
112# variable.
113
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114# KBUILD_SRC is set on invocation of make in OBJ directory
115# KBUILD_SRC is not intended to be used by the regular user (for now)
116ifeq ($(KBUILD_SRC),)
117
118# OK, Make called in directory where kernel src resides
119# Do we want to locate output files in a separate directory?
Cheng Renquanb8b06182009-05-26 16:03:07 +0800120ifeq ("$(origin O)", "command line")
121 KBUILD_OUTPUT := $(O)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122endif
123
124# That's our default target when none is given on the command line
Paul Smith4f193362006-03-05 17:14:10 -0500125PHONY := _all
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126_all:
127
Sam Ravnborg1cacc9a2007-12-06 22:20:11 +0100128# Cancel implicit rules on top Makefile
129$(CURDIR)/Makefile Makefile: ;
130
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131ifneq ($(KBUILD_OUTPUT),)
132# Invoke a second make in the output directory, passing relevant variables
133# check that the output directory actually exists
134saved-output := $(KBUILD_OUTPUT)
Masahiro Yamada1c9e70a2014-03-31 16:41:36 +0900135KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
136 && /bin/pwd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137$(if $(KBUILD_OUTPUT),, \
Masahiro Yamada1c9e70a2014-03-31 16:41:36 +0900138 $(error failed to create output directory "$(saved-output)"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139
Milton Miller0b357862007-09-21 18:09:02 -0500140PHONY += $(MAKECMDGOALS) sub-make
141
Sam Ravnborg1cacc9a2007-12-06 22:20:11 +0100142$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
Charles Keepax16f89092012-10-15 13:49:12 +0100143 @:
Milton Miller0b357862007-09-21 18:09:02 -0500144
145sub-make: FORCE
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 ($(skip-makefile),)
156
Masahiro Yamada7ff52572014-09-09 20:02:22 +0900157# Do not print "Entering directory ...",
158# but we want to display it when entering to the output directory
159# so that IDEs/editors are able to understand relative filenames.
160MAKEFLAGS += --no-print-directory
161
Masahiro Yamadaaa55c8e2014-09-09 20:02:24 +0900162# Call a source code checker (by default, "sparse") as part of the
163# C compilation.
164#
165# Use 'make C=1' to enable checking of only re-compiled files.
166# Use 'make C=2' to enable checking of *all* source files, regardless
167# of whether they are re-compiled or not.
168#
169# See the file "Documentation/sparse.txt" for more details, including
170# where to get the "sparse" utility.
171
172ifeq ("$(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
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200298HOSTCC = gcc
299HOSTCXX = g++
Kirill A. Shutemov51b97e32014-10-20 12:23:12 +0300300HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200301HOSTCXXFLAGS = -O2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302
Behan Webster61163ef2013-09-03 22:27:23 -0400303ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
304HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
305 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
306endif
307
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200308# Decide whether to build built-in, modular, or both.
309# Normally, just do built-in.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310
311KBUILD_MODULES :=
312KBUILD_BUILTIN := 1
313
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +0900314# If we have only "make modules", don't compile built-in objects.
315# When we're building modules with modversions, we need to consider
316# the built-in objects during the descend as well, in order to
317# make sure the checksums are up to date before we record them.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318
319ifeq ($(MAKECMDGOALS),modules)
320 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
321endif
322
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +0900323# If we have "make <whatever> modules", compile modules
324# in addition to whatever we do anyway.
325# Just "make" or "make all" shall build modules as well
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
327ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
328 KBUILD_MODULES := 1
329endif
330
331ifeq ($(MAKECMDGOALS),)
332 KBUILD_MODULES := 1
333endif
334
Sam Ravnborge579d352005-07-27 08:10:10 +0200335export KBUILD_MODULES KBUILD_BUILTIN
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
337
Sam Ravnborg1cacc9a2007-12-06 22:20:11 +0100338# We need some generic definitions (do not try to remake the file).
Masahiro Yamadaa436bb72015-03-27 20:43:36 +0900339scripts/Kbuild.include: ;
340include scripts/Kbuild.include
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341
342# Make variables (CC, etc...)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343AS = $(CROSS_COMPILE)as
344LD = $(CROSS_COMPILE)ld
345CC = $(CROSS_COMPILE)gcc
346CPP = $(CC) -E
347AR = $(CROSS_COMPILE)ar
348NM = $(CROSS_COMPILE)nm
349STRIP = $(CROSS_COMPILE)strip
350OBJCOPY = $(CROSS_COMPILE)objcopy
351OBJDUMP = $(CROSS_COMPILE)objdump
352AWK = awk
353GENKSYMS = scripts/genksyms/genksyms
Sam Ravnborgcaa27b62009-07-20 21:37:11 +0200354INSTALLKERNEL := installkernel
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355DEPMOD = /sbin/depmod
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356PERL = perl
Masahiro Yamada011bf122014-07-18 13:40:11 +0900357PYTHON = python
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358CHECK = sparse
359
Hannes Eder80a7d1d92008-12-27 22:38:44 +0100360CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
361 -Wbitwise -Wno-return-void $(CF)
Sam Ravnborg65881692010-07-28 17:33:09 +0200362CFLAGS_MODULE =
363AFLAGS_MODULE =
364LDFLAGS_MODULE =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365CFLAGS_KERNEL =
366AFLAGS_KERNEL =
Peter Oberparleiter2521f2c2009-06-17 16:28:08 -0700367CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
Dmitry Vyukov5c9a8752016-03-22 14:27:30 -0700368CFLAGS_KCOV = -fsanitize-coverage=trace-pc
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369
370
David Howellsabbf1592012-10-02 18:01:26 +0100371# Use USERINCLUDE when you must reference the UAPI directories only.
372USERINCLUDE := \
373 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
374 -Iarch/$(hdr-arch)/include/generated/uapi \
375 -I$(srctree)/include/uapi \
376 -Iinclude/generated/uapi \
377 -include $(srctree)/include/linux/kconfig.h
378
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379# Use LINUXINCLUDE when you must reference the include/ directory.
380# Needed to be compatible with the O= option
David Howellsabbf1592012-10-02 18:01:26 +0100381LINUXINCLUDE := \
382 -I$(srctree)/arch/$(hdr-arch)/include \
Michal Marek90ac0862015-01-08 16:16:39 +0100383 -Iarch/$(hdr-arch)/include/generated/uapi \
David Howellsabbf1592012-10-02 18:01:26 +0100384 -Iarch/$(hdr-arch)/include/generated \
385 $(if $(KBUILD_SRC), -I$(srctree)/include) \
386 -Iinclude \
387 $(USERINCLUDE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388
Sam Ravnborgd8672b42008-11-21 21:50:02 +0100389KBUILD_CPPFLAGS := -D__KERNEL__
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200391KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
Dave Jones94bed2a2007-07-15 23:41:38 -0700392 -fno-strict-aliasing -fno-common \
Floris Kraaka8735822009-06-15 08:54:02 +0300393 -Werror-implicit-function-declaration \
Kirill A. Shutemov51b97e32014-10-20 12:23:12 +0300394 -Wno-format-security \
395 -std=gnu89
Geert Uytterhoevena1c48bb2014-05-27 09:54:12 +0200396
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200397KBUILD_AFLAGS_KERNEL :=
398KBUILD_CFLAGS_KERNEL :=
Sam Ravnborg222d3942007-10-15 21:59:31 +0200399KBUILD_AFLAGS := -D__ASSEMBLY__
Sam Ravnborg65881692010-07-28 17:33:09 +0200400KBUILD_AFLAGS_MODULE := -DMODULE
401KBUILD_CFLAGS_MODULE := -DMODULE
402KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700404# Read KERNELRELEASE from include/config/kernel.release (if it exists)
405KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
Michal Marekcacd54e2011-05-30 13:36:07 +0200406KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
Sam Ravnborgcb584552006-01-09 21:20:34 +0100407
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200408export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
Sam Ravnborg80ef88d2007-11-17 15:37:31 +0100409export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
Sam Ravnborgcaa27b62009-07-20 21:37:11 +0200410export CPP AR NM STRIP OBJCOPY OBJDUMP
Masahiro Yamada011bf122014-07-18 13:40:11 +0900411export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200412export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413
Sam Ravnborg06c50402007-10-15 22:17:25 +0200414export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
Dmitry Vyukov5c9a8752016-03-22 14:27:30 -0700415export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
Sam Ravnborg222d3942007-10-15 21:59:31 +0200416export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
Sam Ravnborg65881692010-07-28 17:33:09 +0200417export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200418export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
Michal Marek40df7592011-04-20 13:45:30 +0200419export KBUILD_ARFLAGS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420
421# When compiling out-of-tree modules, put MODVERDIR in the module
422# tree rather than in the kernel tree. The kernel tree might
423# even be read-only.
424export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
425
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426# Files to ignore in find ... statements
427
Prarit Bhargavaae63b2d2014-02-06 07:51:42 -0500428export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
429 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
430 -prune -o
Jesper Juhl450c6072012-02-16 22:49:15 +0100431export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
432 --exclude CVS --exclude .pc --exclude .hg --exclude .git
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433
434# ===========================================================================
435# Rules shared between *config targets and build targets
436
437# Basic helpers built in scripts/
Paul Smith4f193362006-03-05 17:14:10 -0500438PHONY += scripts_basic
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439scripts_basic:
440 $(Q)$(MAKE) $(build)=scripts/basic
Steven Rostedt638adb02009-11-17 10:48:25 -0500441 $(Q)rm -f .tmp_quiet_recordmcount
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442
Jan Beulichcd05e6b2005-09-06 11:47:04 +0200443# To avoid any implicit rule to kick in, define an empty command.
444scripts/basic/%: scripts_basic ;
445
Paul Smith4f193362006-03-05 17:14:10 -0500446PHONY += outputmakefile
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200447# outputmakefile generates a Makefile in the output directory, if using a
448# separate output directory. This allows convenient use of make in the
449# output directory.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450outputmakefile:
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200451ifneq ($(KBUILD_SRC),)
Andi Kleen92979992009-01-10 04:56:13 +0100452 $(Q)ln -fsn $(srctree) source
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200453 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
454 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
455endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456
Sam Ravnborgd8ecc5c2011-04-27 22:29:49 +0200457# Support for using generic headers in asm-generic
458PHONY += asm-generic
459asm-generic:
460 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
Catalin Marinas3c5994c2012-10-17 12:25:44 +0100461 src=asm obj=arch/$(SRCARCH)/include/generated/asm
462 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
463 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
Sam Ravnborgd8ecc5c2011-04-27 22:29:49 +0200464
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465# To make sure we do not include .config for any of the *config targets
466# catch them early, and hand them over to scripts/kconfig/Makefile
467# It is allowed to specify more targets when calling make, including
468# mixing *config targets and build targets.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200469# For example 'make oldconfig all'.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470# Detect when mixed targets is specified, and make a second invocation
471# of make so .config is not included in this case either (for *config).
472
David Howells10b63952012-10-02 18:01:57 +0100473version_h := include/generated/uapi/linux/version.h
Michal Marek223c24a2014-11-27 16:13:17 +0100474old_version_h := include/linux/version.h
David Howellsd183e6f2012-10-02 18:01:56 +0100475
Roman Zippel3eb3c742007-01-10 14:45:28 +0100476no-dot-config-targets := clean mrproper distclean \
Michal Marekfbae4d52014-11-28 13:31:43 +0100477 cscope gtags TAGS tags help% %docs check% coccicheck \
David Howellsd183e6f2012-10-02 18:01:56 +0100478 $(version_h) headers_% archheaders archscripts \
Linus Torvalds4aed2fd2010-08-06 09:30:52 -0700479 kernelversion %src-pkg
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480
481config-targets := 0
482mixed-targets := 0
483dot-config := 1
484
485ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
486 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
487 dot-config := 0
488 endif
489endif
490
491ifeq ($(KBUILD_EXTMOD),)
492 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
493 config-targets := 1
Masahiro Yamadad0d38cd2014-12-11 19:12:34 +0900494 ifneq ($(words $(MAKECMDGOALS)),1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 mixed-targets := 1
496 endif
497 endif
498endif
Michal Mareka85a41e2015-12-10 15:53:06 +0100499# install and module_install need also be processed one by one
500ifneq ($(filter install,$(MAKECMDGOALS)),)
501 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
502 mixed-targets := 1
503 endif
504endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505
506ifeq ($(mixed-targets),1)
507# ===========================================================================
508# We're called with mixed targets (*config and build targets).
509# Handle them one by one.
510
Masahiro Yamada9319f452014-04-09 15:51:35 +0900511PHONY += $(MAKECMDGOALS) __build_one_by_one
512
513$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
514 @:
515
516__build_one_by_one:
517 $(Q)set -e; \
518 for i in $(MAKECMDGOALS); do \
519 $(MAKE) -f $(srctree)/Makefile $$i; \
520 done
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
522else
523ifeq ($(config-targets),1)
524# ===========================================================================
525# *config targets only - make sure prerequisites are updated, and descend
526# in scripts/kconfig to make the *config target
527
528# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
529# KBUILD_DEFCONFIG may point out an alternative default configuration
530# used for 'make defconfig'
Masahiro Yamadaa436bb72015-03-27 20:43:36 +0900531include arch/$(SRCARCH)/Makefile
Al Viro61bee202008-08-25 04:51:27 -0400532export KBUILD_DEFCONFIG KBUILD_KCONFIG
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533
Sam Ravnborg31110eb2008-12-13 23:00:45 +0100534config: scripts_basic outputmakefile FORCE
Sam Ravnborg31110eb2008-12-13 23:00:45 +0100535 $(Q)$(MAKE) $(build)=scripts/kconfig $@
536
537%config: scripts_basic outputmakefile FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 $(Q)$(MAKE) $(build)=scripts/kconfig $@
539
540else
541# ===========================================================================
542# Build targets only - this includes vmlinux, arch specific targets, clean
543# targets and others. In general all targets except *config targets.
544
545ifeq ($(KBUILD_EXTMOD),)
546# Additional helpers built in scripts/
547# Carefully list dependencies so we do not try to build scripts twice
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200548# in parallel
Paul Smith4f193362006-03-05 17:14:10 -0500549PHONY += scripts
Andreas Schwaba54292f2013-04-09 19:57:00 +0200550scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
551 asm-generic
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 $(Q)$(MAKE) $(build)=$(@)
553
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554# Objects we will link into vmlinux / subdirs we need to visit
555init-y := init/
David Woodhouse4d2acfb2008-05-23 13:58:12 +0100556drivers-y := drivers/ sound/ firmware/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557net-y := net/
558libs-y := lib/
559core-y := usr/
Feng Wu37d9fe42015-09-22 16:47:29 +0800560virt-y := virt/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561endif # KBUILD_EXTMOD
562
563ifeq ($(dot-config),1)
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200564# Read in config
565-include include/config/auto.conf
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200567ifeq ($(KBUILD_EXTMOD),)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568# Read in dependencies to all Kconfig* files, make sure to run
569# oldconfig if changes are detected.
Roman Zippelc955cca2006-06-08 22:12:39 -0700570-include include/config/auto.conf.cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572# To avoid any implicit rule to kick in, define an empty command
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700573$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574
Roman Zippelc955cca2006-06-08 22:12:39 -0700575# If .config is newer than include/config/auto.conf, someone tinkered
Sam Ravnborg752625c2005-12-26 23:34:03 +0100576# with it and forgot to run make oldconfig.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200577# if auto.conf.cmd is missing then we are probably in a cleaned tree so
Sam Ravnborg752625c2005-12-26 23:34:03 +0100578# we execute the config step to be sure to catch updated Kconfig files
Michal Marekbc081dd2009-12-07 16:38:33 +0100579include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
581else
Sam Ravnborg264a2682009-10-18 00:49:24 +0200582# external modules needs include/generated/autoconf.h and include/config/auto.conf
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200583# but do not care if they are up-to-date. Use auto.conf to trigger the test
584PHONY += include/config/auto.conf
585
586include/config/auto.conf:
Sam Ravnborg264a2682009-10-18 00:49:24 +0200587 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
Michal Marek5369f552012-07-07 23:04:40 +0200588 echo >&2; \
589 echo >&2 " ERROR: Kernel configuration is invalid."; \
590 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
591 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
592 echo >&2 ; \
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200593 /bin/false)
594
595endif # KBUILD_EXTMOD
Roman Zippelc955cca2006-06-08 22:12:39 -0700596
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597else
598# Dummy target needed, because used as prerequisite
Roman Zippelc955cca2006-06-08 22:12:39 -0700599include/config/auto.conf: ;
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200600endif # $(dot-config)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601
602# The all: target is the default when no target is given on the
603# command line.
604# This allow a user to issue only 'make' to build a kernel including modules
Michal Marekc8447162010-06-03 10:54:58 +0200605# Defaults to vmlinux, but the arch makefile usually adds further targets
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606all: vmlinux
607
Michal Marek6dd3f132015-07-16 18:23:53 +0200608# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
609# values of the respective KBUILD_* variables
610ARCH_CPPFLAGS :=
611ARCH_AFLAGS :=
612ARCH_CFLAGS :=
Masahiro Yamadaa436bb72015-03-27 20:43:36 +0900613include arch/$(SRCARCH)/Makefile
Geert Uytterhoevena1c48bb2014-05-27 09:54:12 +0200614
615KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
616
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
Arnd Bergmanne74fc972013-02-15 21:23:58 +0100618KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619else
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200620KBUILD_CFLAGS += -O2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621endif
622
Jiri Kosina69102312014-08-06 16:08:43 -0700623# Tell gcc to never replace conditional load with a non-conditional one
624KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
625
Andi Kleen1873e872012-03-28 11:51:18 -0700626ifdef CONFIG_READABLE_ASM
627# Disable optimizations that make assembler listings hard to read.
628# reorder blocks reorders the control in the function
629# ipa clone creates specialized cloned functions
630# partial inlining inlines only parts of functions
631KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
632 $(call cc-option,-fno-ipa-cp-clone,) \
633 $(call cc-option,-fno-partial-inlining)
634endif
635
Mike Frysinger08f67462009-06-04 16:29:08 -0700636ifneq ($(CONFIG_FRAME_WARN),0)
Andi Kleen35bb5b12008-02-22 15:15:03 +0100637KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
638endif
639
Kees Cook19952a92013-12-19 11:35:58 -0800640# Handle stack protector mode.
Kees Cook13324292014-08-06 16:03:31 -0700641#
642# Since kbuild can potentially perform two passes (first with the old
643# .config values and then with updated .config values), we cannot error out
644# if a desired compiler option is unsupported. If we were to error, kbuild
645# could never get to the second pass and actually notice that we changed
646# the option to something that was supported.
647#
648# Additionally, we don't want to fallback and/or silently change which compiler
649# flags will be used, since that leads to producing kernels with different
650# security feature characteristics depending on the compiler used. ("But I
651# selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
652#
653# The middle ground is to warn here so that the failed option is obvious, but
654# to let the build fail with bad compiler flags so that we can't produce a
655# kernel when there is a CONFIG and compiler mismatch.
656#
Kees Cook87796572013-12-19 11:35:59 -0800657ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
Kees Cook19952a92013-12-19 11:35:58 -0800658 stackp-flag := -fstack-protector
659 ifeq ($(call cc-option, $(stackp-flag)),)
Jan Beulich6c15b322014-02-25 15:01:48 -0800660 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
Fathi Boudra27b2a492014-02-25 15:01:46 -0800661 -fstack-protector not supported by compiler)
Kees Cook19952a92013-12-19 11:35:58 -0800662 endif
Jan Beulich6c15b322014-02-25 15:01:48 -0800663else
664ifdef CONFIG_CC_STACKPROTECTOR_STRONG
Kees Cook87796572013-12-19 11:35:59 -0800665 stackp-flag := -fstack-protector-strong
666 ifeq ($(call cc-option, $(stackp-flag)),)
667 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
668 -fstack-protector-strong not supported by compiler)
669 endif
Kees Cook19952a92013-12-19 11:35:58 -0800670else
671 # Force off for distro compilers that enable stack protector by default.
672 stackp-flag := $(call cc-option, -fno-stack-protector)
Tejun Heo5d707e92009-02-09 22:17:39 +0900673endif
Jan Beulich6c15b322014-02-25 15:01:48 -0800674endif
Kees Cook19952a92013-12-19 11:35:58 -0800675KBUILD_CFLAGS += $(stackp-flag)
Sam Ravnborge06b8b92008-02-13 22:43:28 +0100676
Dmitry Vyukov5c9a8752016-03-22 14:27:30 -0700677ifdef CONFIG_KCOV
678 ifeq ($(call cc-option, $(CFLAGS_KCOV)),)
679 $(warning Cannot use CONFIG_KCOV: \
680 -fsanitize-coverage=trace-pc is not supported by compiler)
681 CFLAGS_KCOV =
682 endif
683endif
684
Michal Marek5631d9c2015-08-19 17:36:41 +0200685ifeq ($(cc-name),clang)
Behan Webster61163ef2013-09-03 22:27:23 -0400686KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
687KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
688KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
689KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
690KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
691# Quiet clang warning: comparison of unsigned expression < 0 is always false
692KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
693# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
694# source of a reference will be _MergedGlobals and not on of the whitelisted names.
695# See modpost pattern 2
696KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
Behan Webster26ea6bb2014-07-31 21:08:25 -0700697KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
Behan Webster61163ef2013-09-03 22:27:23 -0400698else
699
Dave Jonesaf0e5d52011-04-21 17:28:13 -0400700# This warning generated too much noise in a regular build.
701# Use make W=1 to enable this warning (see scripts/Makefile.build)
Michal Marek8417da6f2011-05-02 12:51:15 +0200702KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
Behan Webster61163ef2013-09-03 22:27:23 -0400703endif
Dave Jonesaf0e5d52011-04-21 17:28:13 -0400704
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705ifdef CONFIG_FRAME_POINTER
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200706KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707else
Rabin Vincent7e9501f2010-08-10 19:20:53 +0100708# Some targets (ARM with Thumb2, for example), can't be built with frame
709# pointers. For those, we don't have FUNCTION_TRACER automatically
710# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
711# incompatible with -fomit-frame-pointer with current GCC, so we don't use
712# -fomit-frame-pointer with FUNCTION_TRACER.
713ifndef CONFIG_FUNCTION_TRACER
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200714KBUILD_CFLAGS += -fomit-frame-pointer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715endif
Rabin Vincent7e9501f2010-08-10 19:20:53 +0100716endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717
Linus Torvalds2062afb2014-07-26 14:52:01 -0700718KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
719
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720ifdef CONFIG_DEBUG_INFO
Andi Kleen866ced92014-07-30 20:50:18 +0200721ifdef CONFIG_DEBUG_INFO_SPLIT
722KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
723else
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200724KBUILD_CFLAGS += -g
Andi Kleen866ced92014-07-30 20:50:18 +0200725endif
Behan Webster22883282014-02-14 15:19:17 -0800726KBUILD_AFLAGS += -Wa,-gdwarf-2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727endif
Andi Kleenbfaf2dd2014-07-30 20:50:19 +0200728ifdef CONFIG_DEBUG_INFO_DWARF4
729KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
730endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731
Andi Kleend6f4ceb2010-07-14 15:43:52 +0200732ifdef CONFIG_DEBUG_INFO_REDUCED
Andi Kleene82c4bb2013-02-07 13:58:40 -0800733KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
734 $(call cc-option,-fno-var-tracking)
Andi Kleend6f4ceb2010-07-14 15:43:52 +0200735endif
736
Steven Rostedt606576c2008-10-06 19:06:12 -0400737ifdef CONFIG_FUNCTION_TRACER
Heiko Carstensc0a80c02015-01-09 13:06:33 +0100738ifndef CC_FLAGS_FTRACE
739CC_FLAGS_FTRACE := -pg
740endif
741export CC_FLAGS_FTRACE
Steven Rostedta2546fa2011-02-09 13:15:59 -0500742ifdef CONFIG_HAVE_FENTRY
743CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
744endif
Heiko Carstensc0a80c02015-01-09 13:06:33 +0100745KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
Steven Rostedta2546fa2011-02-09 13:15:59 -0500746KBUILD_AFLAGS += $(CC_USING_FENTRY)
Steven Rostedt72441cb2010-10-13 17:12:30 -0400747ifdef CONFIG_DYNAMIC_FTRACE
Steven Rostedtcf4db252010-10-14 23:32:44 -0400748 ifdef CONFIG_HAVE_C_RECORDMCOUNT
Steven Rostedt72441cb2010-10-13 17:12:30 -0400749 BUILD_C_RECORDMCOUNT := y
750 export BUILD_C_RECORDMCOUNT
751 endif
752endif
Arnaldo Carvalho de Melo16444a82008-05-12 21:20:42 +0200753endif
754
Sam Ravnborg91341d42008-01-21 21:31:44 +0100755# We trigger additional mismatches with less inlining
756ifdef CONFIG_DEBUG_SECTION_MISMATCH
757KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
758endif
759
Sam Ravnborge8e69932005-04-30 16:51:42 -0700760# arch Makefile may override CC so keep this after arch Makefile is included
Rik van Riele8f5bdb02005-05-16 21:53:46 -0700761NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
Sam Ravnborge8e69932005-04-30 16:51:42 -0700762CHECKFLAGS += $(NOSTDINC_FLAGS)
763
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764# warn about C99 declaration after statement
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200765KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200767# disable pointer signed / unsigned warnings in gcc 4.0
Michal Marek8417da6f2011-05-02 12:51:15 +0200768KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769
Kirill Smelkovfe8d0a42009-04-09 15:34:34 +0400770# disable invalid "can't wrap" optimizations for signed / pointers
Linus Torvaldsa1378022009-07-12 11:25:04 -0700771KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
Linus Torvaldsd0115552009-03-19 15:53:19 -0700772
Andi Kleen8f7f5c92009-09-18 12:49:37 -0700773# conserve stack if available
774KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
775
Sergei Trofimovich80970472013-09-13 14:51:40 -0700776# disallow errors like 'EXPORT_GPL(foo);' with missing header
777KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
778
779# require functions to have arguments in prototypes, not empty 'int foo()'
780KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
781
Josh Triplettfe7c36c2013-12-23 13:56:06 -0800782# Prohibit date/time macros, which would make the build non-deterministic
783KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
784
Daniel Wagnerea8daa72016-03-08 09:29:09 +0100785# enforce correct pointer usage
786KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
787
Michal Marek40df7592011-04-20 13:45:30 +0200788# use the deterministic mode of AR if available
789KBUILD_ARFLAGS := $(call ar-option,D)
790
Jason Baronbf5438fc2010-09-17 11:09:00 -0400791# check for 'asm goto'
792ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
793 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
Anton Blanchardc0ccf6f2015-04-09 13:51:31 +1000794 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
Jason Baronbf5438fc2010-09-17 11:09:00 -0400795endif
796
Masahiro Yamadaa436bb72015-03-27 20:43:36 +0900797include scripts/Makefile.kasan
798include scripts/Makefile.extrawarn
Andrey Ryabininc6d30852016-01-20 15:00:55 -0800799include scripts/Makefile.ubsan
Masahiro Yamadaa86fe352014-04-14 18:27:10 +0900800
Michal Marek61754c12015-07-01 17:19:30 +0200801# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
802# last assignments
803KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
804KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
805KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
Sam Ravnborg52bcc332007-10-15 22:03:58 +0200806
Roland McGrath18991192007-07-19 01:48:40 -0700807# Use --build-id when available.
808LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
Sam Ravnborgf86fd302009-09-19 10:14:33 +0200809 $(call cc-ldoption, -Wl$(comma)--build-id,))
Sam Ravnborg65881692010-07-28 17:33:09 +0200810KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
Roland McGrath18991192007-07-19 01:48:40 -0700811LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
812
David Howells5d7d18f2009-03-04 11:59:07 -0800813ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
Andi Kleend79a2712009-09-16 22:36:55 +0200814LDFLAGS_vmlinux += $(call ld-option, -X,)
David Howells5d7d18f2009-03-04 11:59:07 -0800815endif
816
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817# Default kernel image to build when no specific target is given.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200818# KBUILD_IMAGE may be overruled on the command line or
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819# set in the environment
820# Also any assignments in arch/$(ARCH)/Makefile take precedence over
821# this default value
822export KBUILD_IMAGE ?= vmlinux
823
824#
825# INSTALL_PATH specifies where to place the updated kernel and system map
826# images. Default is /boot, but you can set it to other values
827export INSTALL_PATH ?= /boot
828
829#
Jason Cooperf4d4ffc2013-12-01 23:56:28 +0000830# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
831# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
832# an argument if needed. Otherwise it defaults to the kernel install path
833#
834export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
835
836#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
838# relocations required by build roots. This is not defined in the
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200839# makefile but the argument can be passed to make if needed.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840#
841
Sam Ravnborgdf9df032006-01-16 12:46:07 +0100842MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843export MODLIB
844
Theodore Ts'oac031f22006-06-21 20:53:09 -0400845#
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +0900846# INSTALL_MOD_STRIP, if defined, will cause modules to be
847# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
848# the default option --strip-debug will be used. Otherwise,
849# INSTALL_MOD_STRIP value will be used as the options to the strip command.
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100850
Theodore Ts'oac031f22006-06-21 20:53:09 -0400851ifdef INSTALL_MOD_STRIP
852ifeq ($(INSTALL_MOD_STRIP),1)
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100853mod_strip_cmd = $(STRIP) --strip-debug
Theodore Ts'oac031f22006-06-21 20:53:09 -0400854else
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100855mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
Theodore Ts'oac031f22006-06-21 20:53:09 -0400856endif # INSTALL_MOD_STRIP=1
857else
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100858mod_strip_cmd = true
Theodore Ts'oac031f22006-06-21 20:53:09 -0400859endif # INSTALL_MOD_STRIP
860export mod_strip_cmd
861
Bertrand Jacquinbeb50df2014-08-27 20:31:56 +0930862# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
863# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
864# or CONFIG_MODULE_COMPRESS_XZ.
865
866mod_compress_cmd = true
867ifdef CONFIG_MODULE_COMPRESS
868 ifdef CONFIG_MODULE_COMPRESS_GZIP
Jason A. Donenfeld3d1450d2015-07-07 20:26:07 +0200869 mod_compress_cmd = gzip -n -f
Bertrand Jacquinbeb50df2014-08-27 20:31:56 +0930870 endif # CONFIG_MODULE_COMPRESS_GZIP
871 ifdef CONFIG_MODULE_COMPRESS_XZ
Jason A. Donenfeld3d1450d2015-07-07 20:26:07 +0200872 mod_compress_cmd = xz -f
Bertrand Jacquinbeb50df2014-08-27 20:31:56 +0930873 endif # CONFIG_MODULE_COMPRESS_XZ
874endif # CONFIG_MODULE_COMPRESS
875export mod_compress_cmd
876
P J P1bf49dd2013-11-12 15:11:44 -0800877# Select initial ramdisk compression format, default is gzip(1).
878# This shall be used by the dracut(8) tool while creating an initramfs image.
879#
Jan Beulich7ac18152013-12-18 17:08:57 -0800880INITRD_COMPRESS-y := gzip
881INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
882INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
883INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
884INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
885INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
Linus Torvaldsb7000ad2013-12-20 16:52:45 -0800886# do not export INITRD_COMPRESS, since we didn't actually
887# choose a sane default compression above.
888# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889
Michal Marekd9d8d7e2013-01-25 13:41:31 +1030890ifdef CONFIG_MODULE_SIG_ALL
David Woodhouse3ee550f2015-08-14 16:17:16 +0100891$(eval $(call config_filename,MODULE_SIG_KEY))
892
893mod_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 +1030894else
895mod_sign_cmd = true
896endif
897export mod_sign_cmd
898
899
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900ifeq ($(KBUILD_EXTMOD),)
David Howellscfc411e2015-08-14 15:20:41 +0100901core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902
903vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
904 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
Feng Wu37d9fe42015-09-22 16:47:29 +0800905 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906
907vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
Feng Wu37d9fe42015-09-22 16:47:29 +0800908 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909
910init-y := $(patsubst %/, %/built-in.o, $(init-y))
911core-y := $(patsubst %/, %/built-in.o, $(core-y))
912drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
913net-y := $(patsubst %/, %/built-in.o, $(net-y))
914libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
915libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
916libs-y := $(libs-y1) $(libs-y2)
Feng Wu37d9fe42015-09-22 16:47:29 +0800917virt-y := $(patsubst %/, %/built-in.o, $(virt-y))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200919# Externally visible symbols (used by link-vmlinux.sh)
Sam Ravnborg95698572012-05-05 10:18:40 +0200920export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
Feng Wu37d9fe42015-09-22 16:47:29 +0800921export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
Sam Ravnborg95698572012-05-05 10:18:40 +0200922export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200923export LDFLAGS_vmlinux
Michal Marek6615d6c2013-04-12 14:12:50 +0200924# used by scripts/pacmage/Makefile
Feng Wu37d9fe42015-09-22 16:47:29 +0800925export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200927vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200929# Final link of vmlinux
930 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
931quiet_cmd_link-vmlinux = LINK $@
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200933# Include targets which we want to
934# execute if the rest of the kernel build went well.
935vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
David Woodhouse0f836e5f2006-10-11 01:21:43 -0700936ifdef CONFIG_HEADERS_CHECK
David Woodhouse0e7af8d042006-10-13 16:04:23 +0100937 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
David Woodhouse0f836e5f2006-10-11 01:21:43 -0700938endif
Mathieu Desnoyers267c4022007-10-18 23:41:07 -0700939ifdef CONFIG_SAMPLES
940 $(Q)$(MAKE) $(build)=samples
941endif
Randy Dunlap3794f3e2008-08-12 15:09:06 -0700942ifdef CONFIG_BUILD_DOCSRC
943 $(Q)$(MAKE) $(build)=Documentation
944endif
Jan Kiszka3ee7b3f2015-02-17 13:46:36 -0800945ifdef CONFIG_GDB_SCRIPTS
946 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
947endif
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200948 +$(call if_changed,link-vmlinux)
Sam Ravnborg741f98f2007-07-17 10:54:06 +0200949
Masahiro Yamada38385f82014-04-28 16:26:18 +0900950# The actual objects are generated when descending,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951# make sure no implicit rule kicks in
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200952$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953
954# Handle descending into subdirectories listed in $(vmlinux-dirs)
955# Preset locale variables to speed up the build process. Limit locale
956# tweaks to this spot to avoid wrong language settings when running
957# make menuconfig etc.
958# Error messages still appears in the original language
959
Paul Smith4f193362006-03-05 17:14:10 -0500960PHONY += $(vmlinux-dirs)
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200961$(vmlinux-dirs): prepare scripts
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962 $(Q)$(MAKE) $(build)=$@
963
Michal Marek0d0e7712013-07-11 15:34:51 +0200964define filechk_kernel.release
965 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
966endef
967
Geert Uytterhoeven83a35e32013-06-28 11:27:31 +0200968# Store (new) KERNELRELEASE string in include/config/kernel.release
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700969include/config/kernel.release: include/config/auto.conf FORCE
Michal Marek0d0e7712013-07-11 15:34:51 +0200970 $(call filechk,kernel.release)
Sam Ravnborgcb584552006-01-09 21:20:34 +0100971
972
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973# Things we need to do before we recursively start building the kernel
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200974# or the modules are listed in "prepare".
975# A multi level approach is used. prepareN is processed before prepareN-1.
976# archprepare is used in arch Makefiles and when processed asm symlink,
977# version.h and scripts_basic is processed / created.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200979# Listed in dependency order
Paul Smith4f193362006-03-05 17:14:10 -0500980PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200981
Sam Ravnborg86feeaa2005-09-09 19:28:28 +0200982# prepare3 is used to check if we are building in a separate output directory,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983# and if so do:
984# 1) Check that make has not been executed in the kernel src $(srctree)
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700985prepare3: include/config/kernel.release
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986ifneq ($(KBUILD_SRC),)
Mike Frysingerfd54f502008-11-06 03:31:35 -0500987 @$(kecho) ' Using $(srctree) as source for kernel'
Roman Zippelc955cca2006-06-08 22:12:39 -0700988 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
Michal Marek5369f552012-07-07 23:04:40 +0200989 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
990 echo >&2 " in the '$(srctree)' directory.";\
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991 /bin/false; \
992 fi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993endif
994
Sam Ravnborg86feeaa2005-09-09 19:28:28 +0200995# prepare2 creates a makefile if using a separate output directory
Sam Ravnborgd8ecc5c2011-04-27 22:29:49 +0200996prepare2: prepare3 outputmakefile asm-generic
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997
David Howellsd183e6f2012-10-02 18:01:56 +0100998prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
Sam Ravnborgf7f16b72009-10-18 00:00:43 +0200999 include/config/auto.conf
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001000 $(cmd_crmodverdir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001
H. Peter Anvin6520fe52012-05-08 21:22:24 +03001002archprepare: archheaders archscripts prepare1 scripts_basic
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001003
1004prepare0: archprepare FORCE
Sam Ravnborg8d36a622005-09-10 21:05:36 +02001005 $(Q)$(MAKE) $(build)=.
Sam Ravnborg86feeaa2005-09-09 19:28:28 +02001006
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007# All the preparing..
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -06001008prepare: prepare0 prepare-objtool
1009
Josh Poimboeuf3b27a0c2016-03-03 11:39:30 -06001010ifdef CONFIG_STACK_VALIDATION
Steven Rostedtc2bb9e32016-04-20 11:32:35 -04001011 has_libelf := $(call try-run,\
1012 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
Josh Poimboeuf3b27a0c2016-03-03 11:39:30 -06001013 ifeq ($(has_libelf),1)
1014 objtool_target := tools/objtool FORCE
1015 else
1016 $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev or elfutils-libelf-devel")
1017 SKIP_STACK_VALIDATION := 1
1018 export SKIP_STACK_VALIDATION
1019 endif
1020endif
1021
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -06001022PHONY += prepare-objtool
Josh Poimboeuf3b27a0c2016-03-03 11:39:30 -06001023prepare-objtool: $(objtool_target)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025# Generate some files
1026# ---------------------------------------------------------------------------
1027
1028# KERNELRELEASE can change from a few different places, meaning version.h
1029# needs to be updated, so this check is forced on all builds
1030
1031uts_len := 64
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001032define filechk_utsrelease.h
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001034 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1035 exit 1; \
1036 fi; \
1037 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038endef
1039
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001040define filechk_version.h
Jesper Juhl450c6072012-02-16 22:49:15 +01001041 (echo \#define LINUX_VERSION_CODE $(shell \
1042 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001043 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1044endef
1045
David Howellsd183e6f2012-10-02 18:01:56 +01001046$(version_h): $(srctree)/Makefile FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047 $(call filechk,version.h)
Michal Marek223c24a2014-11-27 16:13:17 +01001048 $(Q)rm -f $(old_version_h)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049
Sam Ravnborg273b2812009-10-18 00:52:28 +02001050include/generated/utsrelease.h: include/config/kernel.release FORCE
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001051 $(call filechk,utsrelease.h)
1052
Vegard Nossum179efcb2008-12-16 12:33:43 +01001053PHONY += headerdep
1054headerdep:
Peter Foley9663d982011-04-26 17:17:11 -04001055 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1056 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
Vegard Nossum179efcb2008-12-16 12:33:43 +01001057
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058# ---------------------------------------------------------------------------
David Woodhouse88ecf812008-05-29 11:01:51 +03001059# Firmware install
1060INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1061export INSTALL_FW_PATH
1062
1063PHONY += firmware_install
1064firmware_install: FORCE
1065 @mkdir -p $(objtree)/firmware
1066 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1067
1068# ---------------------------------------------------------------------------
David Woodhouse8d730cf2006-06-18 11:58:39 +01001069# Kernel headers
David Woodhouse8d730cf2006-06-18 11:58:39 +01001070
Sam Ravnborge6883b12008-06-05 16:43:46 +02001071#Default location for installed headers
1072export INSTALL_HDR_PATH = $(objtree)/usr
1073
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001074# If we do an all arch process set dst to asm-$(hdr-arch)
1075hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
Sam Ravnborge6883b12008-06-05 16:43:46 +02001076
H. Peter Anvin052ad272011-11-17 13:17:35 -08001077PHONY += archheaders
1078archheaders:
1079
H. Peter Anvin6520fe52012-05-08 21:22:24 +03001080PHONY += archscripts
1081archscripts:
1082
Sam Ravnborge6883b12008-06-05 16:43:46 +02001083PHONY += __headers
David Howellsd183e6f2012-10-02 18:01:56 +01001084__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
Mike Waychisone1b702c2011-03-14 23:34:25 -07001085 $(Q)$(MAKE) $(build)=scripts build_unifdef
David Woodhouse6d716272006-09-24 22:16:03 +01001086
1087PHONY += headers_install_all
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001088headers_install_all:
1089 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
David Woodhouse6d716272006-09-24 22:16:03 +01001090
David Woodhouse8d730cf2006-06-18 11:58:39 +01001091PHONY += headers_install
Sam Ravnborge6883b12008-06-05 16:43:46 +02001092headers_install: __headers
David Howells10b63952012-10-02 18:01:57 +01001093 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1094 $(error Headers not exportable for the $(SRCARCH) architecture))
1095 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1096 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
David Woodhouse8d730cf2006-06-18 11:58:39 +01001097
Mike Frysinger1f857122007-02-14 00:33:02 -08001098PHONY += headers_check_all
1099headers_check_all: headers_install_all
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001100 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
Mike Frysinger1f857122007-02-14 00:33:02 -08001101
David Woodhouse68475352006-06-18 12:02:10 +01001102PHONY += headers_check
1103headers_check: headers_install
David Howells10b63952012-10-02 18:01:57 +01001104 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1105 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
David Woodhouse68475352006-06-18 12:02:10 +01001106
David Woodhouse8d730cf2006-06-18 11:58:39 +01001107# ---------------------------------------------------------------------------
Shuah Khan5a5da782014-08-07 13:07:46 -06001108# Kernel selftest
1109
1110PHONY += kselftest
1111kselftest:
1112 $(Q)$(MAKE) -C tools/testing/selftests run_tests
1113
Wang Longdcb825a2015-10-08 02:41:18 +00001114kselftest-clean:
1115 $(Q)$(MAKE) -C tools/testing/selftests clean
1116
Bamvor Jian Zhang3d6dee72016-01-08 15:27:34 +08001117PHONY += kselftest-merge
1118kselftest-merge:
1119 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1120 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1121 -m $(objtree)/.config \
1122 $(srctree)/tools/testing/selftests/*/config
1123 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1124
Shuah Khan5a5da782014-08-07 13:07:46 -06001125# ---------------------------------------------------------------------------
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126# Modules
1127
1128ifdef CONFIG_MODULES
1129
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001130# By default, build modules as well
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131
Michal Marek73d13932010-03-10 12:28:58 +01001132all: modules
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +09001134# Build modules
Tejun Heo551559e2007-12-07 21:04:30 +09001135#
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +09001136# A module can be listed more than once in obj-m resulting in
1137# duplicate lines in modules.order files. Those are removed
1138# using awk while concatenating to the final file.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139
Paul Smith4f193362006-03-05 17:14:10 -05001140PHONY += modules
Michal Marek2da30e72010-06-07 22:22:12 +02001141modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
Tejun Heo551559e2007-12-07 21:04:30 +09001142 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
Mike Frysingerfd54f502008-11-06 03:31:35 -05001143 @$(kecho) ' Building modules, stage 2.';
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001144 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
David Woodhouse44463f72008-07-25 14:17:19 -04001145 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146
Michal Mareka6c36632010-03-08 10:07:12 +01001147modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1148 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1149
Michal Marek73d13932010-03-10 12:28:58 +01001150%/modules.builtin: include/config/auto.conf
Michal Mareka6c36632010-03-08 10:07:12 +01001151 $(Q)$(MAKE) $(modbuiltin)=$*
1152
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153
1154# Target to prepare building external modules
Paul Smith4f193362006-03-05 17:14:10 -05001155PHONY += modules_prepare
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001156modules_prepare: prepare scripts
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157
1158# Target to install modules
Paul Smith4f193362006-03-05 17:14:10 -05001159PHONY += modules_install
Linus Torvalds1da177e2005-04-16 15:20:36 -07001160modules_install: _modinst_ _modinst_post
1161
Paul Smith4f193362006-03-05 17:14:10 -05001162PHONY += _modinst_
Michal Marek2da30e72010-06-07 22:22:12 +02001163_modinst_:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164 @rm -rf $(MODLIB)/kernel
1165 @rm -f $(MODLIB)/source
1166 @mkdir -p $(MODLIB)/kernel
Michal Marek890676c2014-04-25 17:36:14 +02001167 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1169 rm -f $(MODLIB)/build ; \
Michal Marek7e1c0472014-04-25 17:29:45 +02001170 ln -s $(CURDIR) $(MODLIB)/build ; \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171 fi
Tejun Heo551559e2007-12-07 21:04:30 +09001172 @cp -f $(objtree)/modules.order $(MODLIB)/
Michal Marekbc081dd2009-12-07 16:38:33 +01001173 @cp -f $(objtree)/modules.builtin $(MODLIB)/
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001174 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001176# This depmod is only for convenience to give the initial
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177# boot a modules.dep even before / is mounted read-write. However the
1178# boot script depmod is the master version.
Paul Smith4f193362006-03-05 17:14:10 -05001179PHONY += _modinst_post
Linus Torvalds6d128e12013-07-10 19:02:51 -07001180_modinst_post: _modinst_
David Woodhouse88ecf812008-05-29 11:01:51 +03001181 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001182 $(call cmd,depmod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183
Josh Boyerd890f512012-11-05 09:09:24 +10301184ifeq ($(CONFIG_MODULE_SIG), y)
1185PHONY += modules_sign
1186modules_sign:
1187 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1188endif
1189
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190else # CONFIG_MODULES
1191
1192# Modules not configured
1193# ---------------------------------------------------------------------------
1194
1195modules modules_install: FORCE
Michal Marek5369f552012-07-07 23:04:40 +02001196 @echo >&2
1197 @echo >&2 "The present kernel configuration has modules disabled."
1198 @echo >&2 "Type 'make config' and enable loadable module support."
1199 @echo >&2 "Then build a kernel with module support enabled."
1200 @echo >&2
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201 @exit 1
1202
1203endif # CONFIG_MODULES
1204
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205###
1206# Cleaning is done on three levels.
1207# make clean Delete most generated files
1208# Leave enough to build external modules
1209# make mrproper Delete the current configuration, and all generated files
1210# make distclean Remove editor backup files, patch leftover files and the like
1211
1212# Directories & files removed with 'make clean'
1213CLEAN_DIRS += $(MODVERDIR)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214
1215# Directories & files removed with 'make mrproper'
Sam Ravnborgd8ecc5c2011-04-27 22:29:49 +02001216MRPROPER_DIRS += include/config usr/include include/generated \
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +09001217 arch/*/include/generated .tmp_objdiff
Masahiro Yamadac22bd32c2015-01-08 17:29:38 +09001218MRPROPER_FILES += .config .config.old .version .old_version \
Rusty Russelld5b71932012-10-02 14:35:24 +09301219 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
David Woodhousefb117942015-07-20 21:16:30 +01001220 signing_key.pem signing_key.priv signing_key.x509 \
1221 x509.genkey extra_certificates signing_key.x509.keyid \
Jan Kiszka3ee7b3f2015-02-17 13:46:36 -08001222 signing_key.x509.signer vmlinux-gdb.py
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223
1224# clean - Delete most, but leave enough to build external modules
1225#
1226clean: rm-dirs := $(CLEAN_DIRS)
1227clean: rm-files := $(CLEAN_FILES)
Gerard Snitselaarfb68d4b2012-02-04 02:55:59 -07001228clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229
Pawel Mollbd1ee802012-10-29 11:23:02 +00001230PHONY += $(clean-dirs) clean archclean vmlinuxclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231$(clean-dirs):
1232 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1233
Pawel Mollbd1ee802012-10-29 11:23:02 +00001234vmlinuxclean:
1235 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1236
1237clean: archclean vmlinuxclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238
1239# mrproper - Delete all generated files, including .config
1240#
1241mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1242mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1243mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1244
Paul Smith4f193362006-03-05 17:14:10 -05001245PHONY += $(mrproper-dirs) mrproper archmrproper
Linus Torvalds1da177e2005-04-16 15:20:36 -07001246$(mrproper-dirs):
1247 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1248
1249mrproper: clean archmrproper $(mrproper-dirs)
1250 $(call cmd,rmdirs)
1251 $(call cmd,rmfiles)
1252
1253# distclean
1254#
Paul Smith4f193362006-03-05 17:14:10 -05001255PHONY += distclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256
1257distclean: mrproper
1258 @find $(srctree) $(RCS_FIND_IGNORE) \
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001259 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
Masahiro Yamadaa03fcb502014-03-28 16:36:12 +09001261 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262 -type f -print | xargs rm -f
1263
1264
1265# Packaging of the kernel to various formats
1266# ---------------------------------------------------------------------------
1267# rpm target kept for backward compatibility
Michal Marekc79624c2014-07-04 22:53:52 +02001268package-dir := scripts/package
Linus Torvalds1da177e2005-04-16 15:20:36 -07001269
Arnaldo Carvalho de Melobafb6742010-06-07 07:44:25 -03001270%src-pkg: FORCE
1271 $(Q)$(MAKE) $(build)=$(package-dir) $@
Zach Brown031ecc62006-06-08 22:12:37 -07001272%pkg: include/config/kernel.release FORCE
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001273 $(Q)$(MAKE) $(build)=$(package-dir) $@
Zach Brown031ecc62006-06-08 22:12:37 -07001274rpm: include/config/kernel.release FORCE
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001275 $(Q)$(MAKE) $(build)=$(package-dir) $@
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276
1277
1278# Brief documentation of the typical targets used
1279# ---------------------------------------------------------------------------
1280
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001281boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
Konstantin Khlebnikova1e7b7b2014-10-28 17:18:20 +04001282boards := $(sort $(notdir $(boards)))
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001283board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1284board-dirs := $(sort $(notdir $(board-dirs:/=)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001285
1286help:
1287 @echo 'Cleaning targets:'
Samuel Tardieu5ea084e2006-12-12 19:09:40 +01001288 @echo ' clean - Remove most generated files but keep the config and'
Jesper Juhl5cc8d242006-09-24 14:01:08 +02001289 @echo ' enough build support to build external modules'
Samuel Tardieu5ea084e2006-12-12 19:09:40 +01001290 @echo ' mrproper - Remove all generated files + config + various backup files'
Jesper Juhl5cc8d242006-09-24 14:01:08 +02001291 @echo ' distclean - mrproper + remove editor backup and patch files'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292 @echo ''
1293 @echo 'Configuration targets:'
1294 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1295 @echo ''
1296 @echo 'Other generic targets:'
1297 @echo ' all - Build all targets marked with [*]'
1298 @echo '* vmlinux - Build the bare kernel'
1299 @echo '* modules - Build all modules'
Bodo Eggert9cc5d742005-11-23 20:11:34 +01001300 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
David Woodhouse88ecf812008-05-29 11:01:51 +03001301 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1302 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303 @echo ' dir/ - Build all files in dir and below'
Wang YanQing40ab87a2015-12-11 00:35:19 +08001304 @echo ' dir/file.[ois] - Build specified target only'
Joe Perches62718972010-01-13 09:31:44 -08001305 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1306 @echo ' (requires a recent binutils and recent build (System.map))'
Sam Ravnborg155ad602005-07-07 17:56:08 -07001307 @echo ' dir/file.ko - Build module including final link'
Robert P. J. Dayc4d5ee62009-04-24 12:35:23 -04001308 @echo ' modules_prepare - Set up for building external modules'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309 @echo ' tags/TAGS - Generate tags file for editors'
1310 @echo ' cscope - Generate cscope index'
Jianbin Kangf4ed1002011-01-14 20:07:05 +08001311 @echo ' gtags - Generate GNU GLOBAL index'
Michal Marek3f1d9a62014-07-11 15:57:24 +02001312 @echo ' kernelrelease - Output the release version string (use with make -s)'
1313 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1314 @echo ' image_name - Output the image name (use with make -s)'
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001315 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
Geert Uytterhoeven59df3232007-01-29 13:47:01 +01001316 echo ' (default: $(INSTALL_HDR_PATH))'; \
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001317 echo ''
Linus Torvalds1da177e2005-04-16 15:20:36 -07001318 @echo 'Static analysers'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319 @echo ' checkstack - Generate a list of stack hogs'
1320 @echo ' namespacecheck - Name space analysis on compiled kernel'
Sam Ravnborgaa025e72007-11-14 21:34:55 +01001321 @echo ' versioncheck - Sanity check on version.h usage'
Randy Dunlapec2d9872007-11-04 12:01:55 -08001322 @echo ' includecheck - Check for duplicate included header files'
Adrian Bunk295ac052007-08-24 23:04:56 +02001323 @echo ' export_report - List the usages of all exported symbols'
Vegard Nossum179efcb2008-12-16 12:33:43 +01001324 @echo ' headers_check - Sanity check on exported headers'
Nicolas Palix74425ee2010-06-06 17:15:01 +02001325 @echo ' headerdep - Detect inclusion cycles in headers'
1326 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1327 @echo ''
Shuah Khan5a5da782014-08-07 13:07:46 -06001328 @echo 'Kernel selftest'
1329 @echo ' kselftest - Build and run kernel selftest (run as root)'
1330 @echo ' Build, install, and boot kernel before'
1331 @echo ' running kselftest on it'
Wang Longdcb825a2015-10-08 02:41:18 +00001332 @echo ' kselftest-clean - Remove all generated kselftest files'
Bamvor Jian Zhang3d6dee72016-01-08 15:27:34 +08001333 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existed'
1334 @echo ' .config.'
Shuah Khan5a5da782014-08-07 13:07:46 -06001335 @echo ''
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336 @echo 'Kernel packaging:'
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001337 @$(MAKE) $(build)=$(package-dir) help
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338 @echo ''
1339 @echo 'Documentation targets:'
1340 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1341 @echo ''
Andres Salomon01dee182008-04-25 22:34:58 -04001342 @echo 'Architecture specific targets ($(SRCARCH)):'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343 @$(if $(archhelp),$(archhelp),\
Andres Salomon01dee182008-04-25 22:34:58 -04001344 echo ' No architecture specific help defined for $(SRCARCH)')
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345 @echo ''
1346 @$(if $(boards), \
1347 $(foreach b, $(boards), \
1348 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1349 echo '')
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001350 @$(if $(board-dirs), \
1351 $(foreach b, $(board-dirs), \
1352 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1353 printf " %-16s - Show all of the above\\n" help-boards; \
1354 echo '')
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355
1356 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
Sam Ravnborg45d506b2006-08-08 21:35:14 +02001357 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001358 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
Dustin Kirkland701842e2006-05-23 15:57:23 -05001359 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1360 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
Ingo Molnaraf07ce32011-06-16 13:26:23 +02001361 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
Sam Ravnborg28bc20d2011-04-27 22:15:27 +02001362 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1363 @echo ' 1: warnings which may be relevant and do not occur too often'
1364 @echo ' 2: warnings which occur quite often but may still be relevant'
1365 @echo ' 3: more obscure warnings, can most likely be ignored'
Michal Mareka6de5532011-04-29 14:45:31 +02001366 @echo ' Multiple levels can be combined with W=12 or W=123'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367 @echo ''
1368 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1369 @echo 'For further info see the ./README file'
1370
1371
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001372help-board-dirs := $(addprefix help-,$(board-dirs))
1373
1374help-boards: $(help-board-dirs)
1375
Michal Marekfbae4d52014-11-28 13:31:43 +01001376boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001377
1378$(help-board-dirs): help-%:
1379 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1380 @$(if $(boards-per-dir), \
1381 $(foreach b, $(boards-per-dir), \
1382 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1383 echo '')
1384
1385
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386# Documentation targets
1387# ---------------------------------------------------------------------------
1388%docs: scripts_basic FORCE
Ben Hutchingsb479bfd2015-09-28 01:09:52 +01001389 $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1391
1392else # KBUILD_EXTMOD
1393
1394###
1395# External module support.
1396# When building external modules the kernel used as basis is considered
1397# read-only, and no consistency checks are made and the make
1398# system is not used on the basis kernel. If updates are required
1399# in the basis kernel ordinary make commands (without M=...) must
1400# be used.
1401#
1402# The following are the only valid targets when building external
1403# modules.
1404# make M=dir clean Delete all automatically generated files
1405# make M=dir modules Make all modules in specified dir
1406# make M=dir Same as 'make M=dir modules'
1407# make M=dir modules_install
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001408# Install the modules built in the module directory
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409# Assumes install directory is already created
1410
1411# We are always building modules
1412KBUILD_MODULES := 1
Paul Smith4f193362006-03-05 17:14:10 -05001413PHONY += crmodverdir
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414crmodverdir:
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001415 $(cmd_crmodverdir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416
Paul Smith4f193362006-03-05 17:14:10 -05001417PHONY += $(objtree)/Module.symvers
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418$(objtree)/Module.symvers:
1419 @test -e $(objtree)/Module.symvers || ( \
1420 echo; \
1421 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1422 echo " is missing; modules will have no dependencies and modversions."; \
1423 echo )
1424
1425module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
Paul Smith4f193362006-03-05 17:14:10 -05001426PHONY += $(module-dirs) modules
Linus Torvalds1da177e2005-04-16 15:20:36 -07001427$(module-dirs): crmodverdir $(objtree)/Module.symvers
1428 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1429
1430modules: $(module-dirs)
Mike Frysingerfd54f502008-11-06 03:31:35 -05001431 @$(kecho) ' Building modules, stage 2.';
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001432 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433
Paul Smith4f193362006-03-05 17:14:10 -05001434PHONY += modules_install
Sam Ravnborga67dc212006-01-28 23:51:57 +01001435modules_install: _emodinst_ _emodinst_post
Adrian Bunke6304662006-02-14 15:58:15 +01001436
Paul Smith4f193362006-03-05 17:14:10 -05001437install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1438PHONY += _emodinst_
Sam Ravnborga67dc212006-01-28 23:51:57 +01001439_emodinst_:
Sam Ravnborga67dc212006-01-28 23:51:57 +01001440 $(Q)mkdir -p $(MODLIB)/$(install-dir)
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001441 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442
Paul Smith4f193362006-03-05 17:14:10 -05001443PHONY += _emodinst_post
Sam Ravnborga67dc212006-01-28 23:51:57 +01001444_emodinst_post: _emodinst_
1445 $(call cmd,depmod)
1446
Linus Torvalds1da177e2005-04-16 15:20:36 -07001447clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1448
Paul Smith4f193362006-03-05 17:14:10 -05001449PHONY += $(clean-dirs) clean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001450$(clean-dirs):
1451 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1452
1453clean: rm-dirs := $(MODVERDIR)
Michal Marek88d7be02010-09-06 12:00:08 +02001454clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455
1456help:
1457 @echo ' Building external modules.'
1458 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1459 @echo ''
1460 @echo ' modules - default target, build the module(s)'
1461 @echo ' modules_install - install the module'
1462 @echo ' clean - remove generated files in module directory only'
1463 @echo ''
Sam Ravnborg06300b22006-01-25 07:13:18 +01001464
1465# Dummies...
Paul Smith4f193362006-03-05 17:14:10 -05001466PHONY += prepare scripts
Sam Ravnborg06300b22006-01-25 07:13:18 +01001467prepare: ;
1468scripts: ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001469endif # KBUILD_EXTMOD
1470
Michal Marek88d7be02010-09-06 12:00:08 +02001471clean: $(clean-dirs)
1472 $(call cmd,rmdirs)
1473 $(call cmd,rmfiles)
Kevin Cernekee43f67c92011-05-10 15:47:16 -07001474 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
Michal Marek88d7be02010-09-06 12:00:08 +02001475 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
David Howellsaddbcdb2012-09-26 10:09:50 +01001476 -o -name '*.ko.*' \
Andi Kleen866ced92014-07-30 20:50:18 +02001477 -o -name '*.dwo' \
Rasmus Villemoesd523b252015-08-20 11:53:29 +02001478 -o -name '*.su' \
Michal Marek88d7be02010-09-06 12:00:08 +02001479 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1480 -o -name '*.symtypes' -o -name 'modules.order' \
1481 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1482 -o -name '*.gcno' \) -type f -print | xargs rm -f
1483
Linus Torvalds1da177e2005-04-16 15:20:36 -07001484# Generate tags for editors
1485# ---------------------------------------------------------------------------
Sam Ravnborga680eed2008-12-03 22:24:13 +01001486quiet_cmd_tags = GEN $@
1487 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
Linus Torvalds1da177e2005-04-16 15:20:36 -07001488
Jianbin Kangf4ed1002011-01-14 20:07:05 +08001489tags TAGS cscope gtags: FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490 $(call cmd,tags)
1491
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492# Scripts to check various things for consistency
1493# ---------------------------------------------------------------------------
1494
Peter Foley279f3dd2011-04-26 17:15:01 -04001495PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1496
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497includecheck:
Peter Foley436f8762011-04-26 17:18:29 -04001498 find $(srctree)/* $(RCS_FIND_IGNORE) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001499 -name '*.[hcS]' -type f -print | sort \
Geert Uytterhoeven80007432007-11-05 11:51:44 +01001500 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
Linus Torvalds1da177e2005-04-16 15:20:36 -07001501
1502versioncheck:
Peter Foley2ee2d292011-04-26 17:19:28 -04001503 find $(srctree)/* $(RCS_FIND_IGNORE) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504 -name '*.[hcS]' -type f -print | sort \
Geert Uytterhoeven80007432007-11-05 11:51:44 +01001505 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
Linus Torvalds1da177e2005-04-16 15:20:36 -07001506
Nicolas Palix74425ee2010-06-06 17:15:01 +02001507coccicheck:
1508 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1509
Linus Torvalds1da177e2005-04-16 15:20:36 -07001510namespacecheck:
1511 $(PERL) $(srctree)/scripts/namespace.pl
1512
Adrian Bunk295ac052007-08-24 23:04:56 +02001513export_report:
1514 $(PERL) $(srctree)/scripts/export_report.pl
1515
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516endif #ifeq ($(config-targets),1)
1517endif #ifeq ($(mixed-targets),1)
1518
Mike Marciniszync398ff02013-06-24 08:48:37 -04001519PHONY += checkstack kernelrelease kernelversion image_name
Jeff Dikee3ccf6e2006-09-27 01:50:37 -07001520
Jeff Dike011e3a92006-12-13 00:34:12 -08001521# UML needs a little special treatment here. It wants to use the host
1522# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1523# else wants $(ARCH), including people doing cross-builds, which means
1524# that $(SUBARCH) doesn't work here.
1525ifeq ($(ARCH), um)
1526CHECKSTACK_ARCH := $(SUBARCH)
1527else
1528CHECKSTACK_ARCH := $(ARCH)
1529endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001530checkstack:
1531 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
Jeff Dike011e3a92006-12-13 00:34:12 -08001532 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001533
Amerigo Wang7b8ea532010-08-20 05:36:06 -04001534kernelrelease:
1535 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
Amerigo Wang01ab1782010-06-28 10:45:21 +08001536
Sam Ravnborgcb584552006-01-09 21:20:34 +01001537kernelversion:
Sam Ravnborg2244cbd2006-01-16 12:12:12 +01001538 @echo $(KERNELVERSION)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001539
Mike Marciniszync398ff02013-06-24 08:48:37 -04001540image_name:
1541 @echo $(KBUILD_IMAGE)
1542
Borislav Petkovea01fa92012-04-11 18:36:18 +02001543# Clear a bunch of variables before executing the submake
1544tools/: FORCE
David Howellsbf351822012-11-05 21:02:08 +00001545 $(Q)mkdir -p $(objtree)/tools
Josh Poimboeufe17cf3a2016-03-03 08:53:43 -06001546 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
Borislav Petkovea01fa92012-04-11 18:36:18 +02001547
1548tools/%: FORCE
David Howellsbf351822012-11-05 21:02:08 +00001549 $(Q)mkdir -p $(objtree)/tools
Josh Poimboeufe17cf3a2016-03-03 08:53:43 -06001550 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
Borislav Petkovea01fa92012-04-11 18:36:18 +02001551
Sam Ravnborg06300b22006-01-25 07:13:18 +01001552# Single targets
1553# ---------------------------------------------------------------------------
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001554# Single targets are compatible with:
Robert P. J. Daye1b85132008-02-03 15:14:02 +02001555# - build with mixed source and output
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001556# - build with separate output dir 'make O=...'
1557# - external modules
1558#
1559# target-dir => where to store outputfile
1560# build-dir => directory in kernel source tree to use
Sam Ravnborg06300b22006-01-25 07:13:18 +01001561
Sam Ravnborg06300b22006-01-25 07:13:18 +01001562ifeq ($(KBUILD_EXTMOD),)
Sam Ravnborgaa360872006-04-06 08:25:31 +02001563 build-dir = $(patsubst %/,%,$(dir $@))
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001564 target-dir = $(dir $@)
Sam Ravnborg06300b22006-01-25 07:13:18 +01001565else
1566 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001567 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1568 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
Sam Ravnborg06300b22006-01-25 07:13:18 +01001569endif
1570
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001571%.s: %.c prepare scripts FORCE
1572 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1573%.i: %.c prepare scripts FORCE
1574 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1575%.o: %.c prepare scripts FORCE
1576 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1577%.lst: %.c prepare scripts FORCE
1578 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1579%.s: %.S prepare scripts FORCE
1580 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1581%.o: %.S prepare scripts FORCE
1582 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
Andreas Gruenbacher15fde672006-05-09 20:37:30 +02001583%.symtypes: %.c prepare scripts FORCE
1584 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001585
1586# Modules
Sam Ravnborg31110eb2008-12-13 23:00:45 +01001587/: prepare scripts FORCE
1588 $(cmd_crmodverdir)
1589 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1590 $(build)=$(build-dir)
Peter Foley8e2faea2014-09-25 11:23:58 -07001591# Make sure the latest headers are built for Documentation
1592Documentation/: headers_install
Sam Ravnborg31110eb2008-12-13 23:00:45 +01001593%/: prepare scripts FORCE
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001594 $(cmd_crmodverdir)
Sam Ravnborg06300b22006-01-25 07:13:18 +01001595 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001596 $(build)=$(build-dir)
1597%.ko: prepare scripts FORCE
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001598 $(cmd_crmodverdir)
Sam Ravnborg06300b22006-01-25 07:13:18 +01001599 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001600 $(build)=$(build-dir) $(@:.ko=.o)
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001601 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
Sam Ravnborg06300b22006-01-25 07:13:18 +01001602
Masahiro Yamada38385f82014-04-28 16:26:18 +09001603# FIXME Should go into a make.lib or something
Linus Torvalds1da177e2005-04-16 15:20:36 -07001604# ===========================================================================
1605
1606quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1607 cmd_rmdirs = rm -rf $(rm-dirs)
1608
1609quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1610 cmd_rmfiles = rm -f $(rm-files)
1611
Uwe Kleine-Königbc3c26f2008-04-21 22:53:56 +00001612# Run depmod only if we have System.map and depmod is executable
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001613quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
Michal Marek569658d2011-06-15 22:15:47 +02001614 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
Rusty Russellb92021b2013-03-15 15:04:17 +10301615 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001616
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001617# Create temporary dir for module support files
Sam Ravnborgab19f872007-10-22 11:23:07 +02001618# clean it up only when building all modules
1619cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1620 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001621
Linus Torvalds1da177e2005-04-16 15:20:36 -07001622# read all saved command lines
1623
1624targets := $(wildcard $(sort $(targets)))
1625cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1626
1627ifneq ($(cmd_files),)
1628 $(cmd_files): ; # Do not try to update included dependency files
1629 include $(cmd_files)
1630endif
1631
Linus Torvalds1da177e2005-04-16 15:20:36 -07001632endif # skip-makefile
1633
Paul Smith4f193362006-03-05 17:14:10 -05001634PHONY += FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001635FORCE:
Paul Smith4f193362006-03-05 17:14:10 -05001636
Paul Smith4f193362006-03-05 17:14:10 -05001637# Declare the contents of the .PHONY variable as phony. We keep that
Kirill Smelkovfe8d0a42009-04-09 15:34:34 +04001638# information in a variable so we can use it in if_changed and friends.
Paul Smith4f193362006-03-05 17:14:10 -05001639.PHONY: $(PHONY)