blob: fb93350cf6456c89649aff15a99efae74eca5cb8 [file] [log] [blame]
Linus Torvalds55922c92011-05-29 17:43:36 -07001VERSION = 3
Linus Torvalds97bf6af2014-12-20 17:08:50 -08002PATCHLEVEL = 19
Linus Torvalds55922c92011-05-29 17:43:36 -07003SUBLEVEL = 0
Linus Torvaldsec6f34e2015-01-18 18:02:20 +12004EXTRAVERSION = -rc5
Linus Torvalds0df1f242014-11-02 15:01:51 -08005NAME = Diseased Newt
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 Yamada7ff52572014-09-09 20:02:22 +090013# Do not use make's built-in rules and variables
14# (this increases performance and avoids hard-to-debug behaviour);
15MAKEFLAGS += -rR
Linus Torvalds1da177e2005-04-16 15:20:36 -070016
H. Peter Anvinc0513462009-12-17 06:56:11 -080017# Avoid funny character set dependencies
H. Peter Anvin06b5dc62009-12-17 15:51:37 -080018unexport LC_ALL
H. Peter Anvinc0513462009-12-17 06:56:11 -080019LC_COLLATE=C
20LC_NUMERIC=C
Michal Marek07105202010-01-08 12:25:37 +010021export LC_COLLATE LC_NUMERIC
H. Peter Anvinc0513462009-12-17 06:56:11 -080022
Borislav Petkovab7474e2013-11-11 15:27:43 +010023# Avoid interference with shell env settings
24unexport GREP_OPTIONS
25
Linus Torvalds1da177e2005-04-16 15:20:36 -070026# We are using a recursive build, so we need to do a little thinking
27# to get the ordering right.
28#
29# Most importantly: sub-Makefiles should only ever modify files in
30# their own directory. If in some directory we have a dependency on
31# a file in another dir (which doesn't happen often, but it's often
32# unavoidable when linking the built-in.o targets which finally
33# turn into vmlinux), we will call a sub make in that other dir, and
34# after that we are sure that everything which is in that other dir
35# is now up to date.
36#
37# The only cases where we need to modify files which have global
38# effects are thus separated out and done before the recursive
39# descending is started. They are now explicitly listed as the
40# prepare rule.
41
Michal Marek066b7ed2014-07-04 14:29:30 +020042# Beautify output
43# ---------------------------------------------------------------------------
44#
45# Normally, we echo the whole command before executing it. By making
46# that echo $($(quiet)$(cmd)), we now have the possibility to set
47# $(quiet) to choose other forms of output instead, e.g.
48#
49# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
50# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
51#
52# If $(quiet) is empty, the whole command will be printed.
53# If it is set to "quiet_", only the short version will be printed.
54# If it is set to "silent_", nothing will be printed at all, since
55# the variable $(silent_cmd_cc_o_c) doesn't exist.
56#
57# A simple variant is to prefix commands with $(Q) - that's useful
58# for commands that shall be hidden in non-verbose mode.
59#
60# $(Q)ln $@ :<
61#
62# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
63# If KBUILD_VERBOSE equals 1 then the above command is displayed.
64#
Linus Torvalds1da177e2005-04-16 15:20:36 -070065# To put more focus on warnings, be less verbose as default
66# Use 'make V=1' to see the full commands
67
Cheng Renquanb8b06182009-05-26 16:03:07 +080068ifeq ("$(origin V)", "command line")
69 KBUILD_VERBOSE = $(V)
Linus Torvalds1da177e2005-04-16 15:20:36 -070070endif
71ifndef KBUILD_VERBOSE
72 KBUILD_VERBOSE = 0
73endif
74
Michal Marek066b7ed2014-07-04 14:29:30 +020075ifeq ($(KBUILD_VERBOSE),1)
76 quiet =
77 Q =
78else
79 quiet=quiet_
80 Q = @
81endif
82
83# If the user is running make -s (silent mode), suppress echoing of
84# commands
85
86ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
87ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
88 quiet=silent_
89endif
90else # make-3.8x
91ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
92 quiet=silent_
93endif
94endif
95
96export quiet Q KBUILD_VERBOSE
97
Linus Torvalds1da177e2005-04-16 15:20:36 -070098# kbuild supports saving output files in a separate directory.
99# To locate output files in a separate directory two syntaxes are supported.
100# In both cases the working directory must be the root of the kernel src.
101# 1) O=
102# Use "make O=dir/to/store/output/files/"
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200103#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104# 2) Set KBUILD_OUTPUT
105# Set the environment variable KBUILD_OUTPUT to point to the directory
106# where the output files shall be placed.
107# export KBUILD_OUTPUT=dir/to/store/output/files/
108# make
109#
110# The O= assignment takes precedence over the KBUILD_OUTPUT environment
111# variable.
112
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113# KBUILD_SRC is set on invocation of make in OBJ directory
114# KBUILD_SRC is not intended to be used by the regular user (for now)
115ifeq ($(KBUILD_SRC),)
116
117# OK, Make called in directory where kernel src resides
118# Do we want to locate output files in a separate directory?
Cheng Renquanb8b06182009-05-26 16:03:07 +0800119ifeq ("$(origin O)", "command line")
120 KBUILD_OUTPUT := $(O)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121endif
122
123# That's our default target when none is given on the command line
Paul Smith4f193362006-03-05 17:14:10 -0500124PHONY := _all
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125_all:
126
Sam Ravnborg1cacc9a2007-12-06 22:20:11 +0100127# Cancel implicit rules on top Makefile
128$(CURDIR)/Makefile Makefile: ;
129
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130ifneq ($(KBUILD_OUTPUT),)
131# Invoke a second make in the output directory, passing relevant variables
132# check that the output directory actually exists
133saved-output := $(KBUILD_OUTPUT)
Masahiro Yamada1c9e70a2014-03-31 16:41:36 +0900134KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
135 && /bin/pwd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136$(if $(KBUILD_OUTPUT),, \
Masahiro Yamada1c9e70a2014-03-31 16:41:36 +0900137 $(error failed to create output directory "$(saved-output)"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
Milton Miller0b357862007-09-21 18:09:02 -0500139PHONY += $(MAKECMDGOALS) sub-make
140
Sam Ravnborg1cacc9a2007-12-06 22:20:11 +0100141$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
Charles Keepax16f89092012-10-15 13:49:12 +0100142 @:
Milton Miller0b357862007-09-21 18:09:02 -0500143
144sub-make: FORCE
Masahiro Yamada745a2542014-09-09 20:02:23 +0900145 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
Masahiro Yamadaaa55c8e2014-09-09 20:02:24 +0900146 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
148# Leave processing to above invocation of make
149skip-makefile := 1
150endif # ifneq ($(KBUILD_OUTPUT),)
151endif # ifeq ($(KBUILD_SRC),)
152
153# We process the rest of the Makefile if this is the final invocation of make
154ifeq ($(skip-makefile),)
155
Masahiro Yamada7ff52572014-09-09 20:02:22 +0900156# Do not print "Entering directory ...",
157# but we want to display it when entering to the output directory
158# so that IDEs/editors are able to understand relative filenames.
159MAKEFLAGS += --no-print-directory
160
Masahiro Yamadaaa55c8e2014-09-09 20:02:24 +0900161# Call a source code checker (by default, "sparse") as part of the
162# C compilation.
163#
164# Use 'make C=1' to enable checking of only re-compiled files.
165# Use 'make C=2' to enable checking of *all* source files, regardless
166# of whether they are re-compiled or not.
167#
168# See the file "Documentation/sparse.txt" for more details, including
169# where to get the "sparse" utility.
170
171ifeq ("$(origin C)", "command line")
172 KBUILD_CHECKSRC = $(C)
173endif
174ifndef KBUILD_CHECKSRC
175 KBUILD_CHECKSRC = 0
176endif
177
178# Use make M=dir to specify directory of external module to build
179# Old syntax make ... SUBDIRS=$PWD is still supported
180# Setting the environment variable KBUILD_EXTMOD take precedence
181ifdef SUBDIRS
182 KBUILD_EXTMOD ?= $(SUBDIRS)
183endif
184
185ifeq ("$(origin M)", "command line")
186 KBUILD_EXTMOD := $(M)
187endif
188
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189# If building an external module we do not care about the all: rule
190# but instead _all depend on modules
Paul Smith4f193362006-03-05 17:14:10 -0500191PHONY += all
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192ifeq ($(KBUILD_EXTMOD),)
193_all: all
194else
195_all: modules
196endif
197
Michal Marek9da07632014-04-25 23:25:18 +0200198ifeq ($(KBUILD_SRC),)
199 # building in the source tree
200 srctree := .
201else
202 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
203 # building in a subdirectory of the source tree
204 srctree := ..
205 else
206 srctree := $(KBUILD_SRC)
207 endif
208endif
Michal Marek7e1c0472014-04-25 17:29:45 +0200209objtree := .
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210src := $(srctree)
211obj := $(objtree)
212
Mattia Dongili0f558c32006-02-19 13:50:37 +0100213VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214
Amerigo Wang11294232009-06-19 03:40:26 -0400215export srctree objtree VPATH
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
218# 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
Behan Webster61163ef2013-09-03 22:27:23 -0400338ifneq ($(CC),)
339ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1)
340COMPILER := clang
341else
342COMPILER := gcc
343endif
344export COMPILER
345endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346
347# Look for make include files relative to root of kernel src
348MAKEFLAGS += --include-dir=$(srctree)
349
Sam Ravnborg1cacc9a2007-12-06 22:20:11 +0100350# We need some generic definitions (do not try to remake the file).
351$(srctree)/scripts/Kbuild.include: ;
Oleg Verych15964862006-12-10 02:18:40 -0800352include $(srctree)/scripts/Kbuild.include
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353
354# Make variables (CC, etc...)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355AS = $(CROSS_COMPILE)as
356LD = $(CROSS_COMPILE)ld
357CC = $(CROSS_COMPILE)gcc
358CPP = $(CC) -E
359AR = $(CROSS_COMPILE)ar
360NM = $(CROSS_COMPILE)nm
361STRIP = $(CROSS_COMPILE)strip
362OBJCOPY = $(CROSS_COMPILE)objcopy
363OBJDUMP = $(CROSS_COMPILE)objdump
364AWK = awk
365GENKSYMS = scripts/genksyms/genksyms
Sam Ravnborgcaa27b62009-07-20 21:37:11 +0200366INSTALLKERNEL := installkernel
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367DEPMOD = /sbin/depmod
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368PERL = perl
Masahiro Yamada011bf122014-07-18 13:40:11 +0900369PYTHON = python
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370CHECK = sparse
371
Hannes Eder80a7d1d92008-12-27 22:38:44 +0100372CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
373 -Wbitwise -Wno-return-void $(CF)
Sam Ravnborg65881692010-07-28 17:33:09 +0200374CFLAGS_MODULE =
375AFLAGS_MODULE =
376LDFLAGS_MODULE =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377CFLAGS_KERNEL =
378AFLAGS_KERNEL =
Peter Oberparleiter2521f2c2009-06-17 16:28:08 -0700379CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380
381
David Howellsabbf1592012-10-02 18:01:26 +0100382# Use USERINCLUDE when you must reference the UAPI directories only.
383USERINCLUDE := \
384 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
385 -Iarch/$(hdr-arch)/include/generated/uapi \
386 -I$(srctree)/include/uapi \
387 -Iinclude/generated/uapi \
388 -include $(srctree)/include/linux/kconfig.h
389
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390# Use LINUXINCLUDE when you must reference the include/ directory.
391# Needed to be compatible with the O= option
David Howellsabbf1592012-10-02 18:01:26 +0100392LINUXINCLUDE := \
393 -I$(srctree)/arch/$(hdr-arch)/include \
Michal Marek90ac0862015-01-08 16:16:39 +0100394 -Iarch/$(hdr-arch)/include/generated/uapi \
David Howellsabbf1592012-10-02 18:01:26 +0100395 -Iarch/$(hdr-arch)/include/generated \
396 $(if $(KBUILD_SRC), -I$(srctree)/include) \
397 -Iinclude \
398 $(USERINCLUDE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399
Sam Ravnborgd8672b42008-11-21 21:50:02 +0100400KBUILD_CPPFLAGS := -D__KERNEL__
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200402KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
Dave Jones94bed2a2007-07-15 23:41:38 -0700403 -fno-strict-aliasing -fno-common \
Floris Kraaka8735822009-06-15 08:54:02 +0300404 -Werror-implicit-function-declaration \
Kirill A. Shutemov51b97e32014-10-20 12:23:12 +0300405 -Wno-format-security \
406 -std=gnu89
Geert Uytterhoevena1c48bb2014-05-27 09:54:12 +0200407
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200408KBUILD_AFLAGS_KERNEL :=
409KBUILD_CFLAGS_KERNEL :=
Sam Ravnborg222d3942007-10-15 21:59:31 +0200410KBUILD_AFLAGS := -D__ASSEMBLY__
Sam Ravnborg65881692010-07-28 17:33:09 +0200411KBUILD_AFLAGS_MODULE := -DMODULE
412KBUILD_CFLAGS_MODULE := -DMODULE
413KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700415# Read KERNELRELEASE from include/config/kernel.release (if it exists)
416KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
Michal Marekcacd54e2011-05-30 13:36:07 +0200417KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
Sam Ravnborgcb584552006-01-09 21:20:34 +0100418
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200419export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
Sam Ravnborg80ef88d2007-11-17 15:37:31 +0100420export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
Sam Ravnborgcaa27b62009-07-20 21:37:11 +0200421export CPP AR NM STRIP OBJCOPY OBJDUMP
Masahiro Yamada011bf122014-07-18 13:40:11 +0900422export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200423export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424
Sam Ravnborg06c50402007-10-15 22:17:25 +0200425export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
Peter Oberparleiter2521f2c2009-06-17 16:28:08 -0700426export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
Sam Ravnborg222d3942007-10-15 21:59:31 +0200427export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
Sam Ravnborg65881692010-07-28 17:33:09 +0200428export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200429export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
Michal Marek40df7592011-04-20 13:45:30 +0200430export KBUILD_ARFLAGS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431
432# When compiling out-of-tree modules, put MODVERDIR in the module
433# tree rather than in the kernel tree. The kernel tree might
434# even be read-only.
435export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
436
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437# Files to ignore in find ... statements
438
Prarit Bhargavaae63b2d2014-02-06 07:51:42 -0500439export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
440 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
441 -prune -o
Jesper Juhl450c6072012-02-16 22:49:15 +0100442export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
443 --exclude CVS --exclude .pc --exclude .hg --exclude .git
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444
445# ===========================================================================
446# Rules shared between *config targets and build targets
447
448# Basic helpers built in scripts/
Paul Smith4f193362006-03-05 17:14:10 -0500449PHONY += scripts_basic
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450scripts_basic:
451 $(Q)$(MAKE) $(build)=scripts/basic
Steven Rostedt638adb02009-11-17 10:48:25 -0500452 $(Q)rm -f .tmp_quiet_recordmcount
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453
Jan Beulichcd05e6b2005-09-06 11:47:04 +0200454# To avoid any implicit rule to kick in, define an empty command.
455scripts/basic/%: scripts_basic ;
456
Paul Smith4f193362006-03-05 17:14:10 -0500457PHONY += outputmakefile
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200458# outputmakefile generates a Makefile in the output directory, if using a
459# separate output directory. This allows convenient use of make in the
460# output directory.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461outputmakefile:
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200462ifneq ($(KBUILD_SRC),)
Andi Kleen92979992009-01-10 04:56:13 +0100463 $(Q)ln -fsn $(srctree) source
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200464 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
465 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
466endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467
Sam Ravnborgd8ecc5c2011-04-27 22:29:49 +0200468# Support for using generic headers in asm-generic
469PHONY += asm-generic
470asm-generic:
471 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
Catalin Marinas3c5994c2012-10-17 12:25:44 +0100472 src=asm obj=arch/$(SRCARCH)/include/generated/asm
473 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
474 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
Sam Ravnborgd8ecc5c2011-04-27 22:29:49 +0200475
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476# To make sure we do not include .config for any of the *config targets
477# catch them early, and hand them over to scripts/kconfig/Makefile
478# It is allowed to specify more targets when calling make, including
479# mixing *config targets and build targets.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200480# For example 'make oldconfig all'.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481# Detect when mixed targets is specified, and make a second invocation
482# of make so .config is not included in this case either (for *config).
483
David Howells10b63952012-10-02 18:01:57 +0100484version_h := include/generated/uapi/linux/version.h
Michal Marek223c24a2014-11-27 16:13:17 +0100485old_version_h := include/linux/version.h
David Howellsd183e6f2012-10-02 18:01:56 +0100486
Roman Zippel3eb3c742007-01-10 14:45:28 +0100487no-dot-config-targets := clean mrproper distclean \
Michal Marekfbae4d52014-11-28 13:31:43 +0100488 cscope gtags TAGS tags help% %docs check% coccicheck \
David Howellsd183e6f2012-10-02 18:01:56 +0100489 $(version_h) headers_% archheaders archscripts \
Linus Torvalds4aed2fd2010-08-06 09:30:52 -0700490 kernelversion %src-pkg
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491
492config-targets := 0
493mixed-targets := 0
494dot-config := 1
495
496ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
497 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
498 dot-config := 0
499 endif
500endif
501
502ifeq ($(KBUILD_EXTMOD),)
503 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
504 config-targets := 1
505 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
506 mixed-targets := 1
507 endif
508 endif
509endif
510
511ifeq ($(mixed-targets),1)
512# ===========================================================================
513# We're called with mixed targets (*config and build targets).
514# Handle them one by one.
515
Masahiro Yamada9319f452014-04-09 15:51:35 +0900516PHONY += $(MAKECMDGOALS) __build_one_by_one
517
518$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
519 @:
520
521__build_one_by_one:
522 $(Q)set -e; \
523 for i in $(MAKECMDGOALS); do \
524 $(MAKE) -f $(srctree)/Makefile $$i; \
525 done
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526
527else
528ifeq ($(config-targets),1)
529# ===========================================================================
530# *config targets only - make sure prerequisites are updated, and descend
531# in scripts/kconfig to make the *config target
532
533# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
534# KBUILD_DEFCONFIG may point out an alternative default configuration
535# used for 'make defconfig'
Sam Ravnborg74b469f2007-10-25 19:42:04 +0200536include $(srctree)/arch/$(SRCARCH)/Makefile
Al Viro61bee202008-08-25 04:51:27 -0400537export KBUILD_DEFCONFIG KBUILD_KCONFIG
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538
Sam Ravnborg31110eb2008-12-13 23:00:45 +0100539config: scripts_basic outputmakefile FORCE
Sam Ravnborg31110eb2008-12-13 23:00:45 +0100540 $(Q)$(MAKE) $(build)=scripts/kconfig $@
541
542%config: scripts_basic outputmakefile FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 $(Q)$(MAKE) $(build)=scripts/kconfig $@
544
545else
546# ===========================================================================
547# Build targets only - this includes vmlinux, arch specific targets, clean
548# targets and others. In general all targets except *config targets.
549
550ifeq ($(KBUILD_EXTMOD),)
551# Additional helpers built in scripts/
552# Carefully list dependencies so we do not try to build scripts twice
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200553# in parallel
Paul Smith4f193362006-03-05 17:14:10 -0500554PHONY += scripts
Andreas Schwaba54292f2013-04-09 19:57:00 +0200555scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
556 asm-generic
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 $(Q)$(MAKE) $(build)=$(@)
558
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559# Objects we will link into vmlinux / subdirs we need to visit
560init-y := init/
David Woodhouse4d2acfb2008-05-23 13:58:12 +0100561drivers-y := drivers/ sound/ firmware/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562net-y := net/
563libs-y := lib/
564core-y := usr/
565endif # KBUILD_EXTMOD
566
567ifeq ($(dot-config),1)
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200568# Read in config
569-include include/config/auto.conf
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200571ifeq ($(KBUILD_EXTMOD),)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572# Read in dependencies to all Kconfig* files, make sure to run
573# oldconfig if changes are detected.
Roman Zippelc955cca2006-06-08 22:12:39 -0700574-include include/config/auto.conf.cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576# To avoid any implicit rule to kick in, define an empty command
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700577$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578
Roman Zippelc955cca2006-06-08 22:12:39 -0700579# If .config is newer than include/config/auto.conf, someone tinkered
Sam Ravnborg752625c2005-12-26 23:34:03 +0100580# with it and forgot to run make oldconfig.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200581# if auto.conf.cmd is missing then we are probably in a cleaned tree so
Sam Ravnborg752625c2005-12-26 23:34:03 +0100582# we execute the config step to be sure to catch updated Kconfig files
Michal Marekbc081dd2009-12-07 16:38:33 +0100583include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
585else
Sam Ravnborg264a2682009-10-18 00:49:24 +0200586# external modules needs include/generated/autoconf.h and include/config/auto.conf
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200587# but do not care if they are up-to-date. Use auto.conf to trigger the test
588PHONY += include/config/auto.conf
589
590include/config/auto.conf:
Sam Ravnborg264a2682009-10-18 00:49:24 +0200591 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
Michal Marek5369f552012-07-07 23:04:40 +0200592 echo >&2; \
593 echo >&2 " ERROR: Kernel configuration is invalid."; \
594 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
595 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
596 echo >&2 ; \
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200597 /bin/false)
598
599endif # KBUILD_EXTMOD
Roman Zippelc955cca2006-06-08 22:12:39 -0700600
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601else
602# Dummy target needed, because used as prerequisite
Roman Zippelc955cca2006-06-08 22:12:39 -0700603include/config/auto.conf: ;
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200604endif # $(dot-config)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605
606# The all: target is the default when no target is given on the
607# command line.
608# This allow a user to issue only 'make' to build a kernel including modules
Michal Marekc8447162010-06-03 10:54:58 +0200609# Defaults to vmlinux, but the arch makefile usually adds further targets
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610all: vmlinux
611
Geert Uytterhoevena1c48bb2014-05-27 09:54:12 +0200612include $(srctree)/arch/$(SRCARCH)/Makefile
613
614KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
615
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
Arnd Bergmanne74fc972013-02-15 21:23:58 +0100617KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618else
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200619KBUILD_CFLAGS += -O2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620endif
621
Jiri Kosina69102312014-08-06 16:08:43 -0700622# Tell gcc to never replace conditional load with a non-conditional one
623KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
624
Andi Kleen1873e872012-03-28 11:51:18 -0700625ifdef CONFIG_READABLE_ASM
626# Disable optimizations that make assembler listings hard to read.
627# reorder blocks reorders the control in the function
628# ipa clone creates specialized cloned functions
629# partial inlining inlines only parts of functions
630KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
631 $(call cc-option,-fno-ipa-cp-clone,) \
632 $(call cc-option,-fno-partial-inlining)
633endif
634
Mike Frysinger08f67462009-06-04 16:29:08 -0700635ifneq ($(CONFIG_FRAME_WARN),0)
Andi Kleen35bb5b12008-02-22 15:15:03 +0100636KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
637endif
638
Kees Cook19952a92013-12-19 11:35:58 -0800639# Handle stack protector mode.
Kees Cook13324292014-08-06 16:03:31 -0700640#
641# Since kbuild can potentially perform two passes (first with the old
642# .config values and then with updated .config values), we cannot error out
643# if a desired compiler option is unsupported. If we were to error, kbuild
644# could never get to the second pass and actually notice that we changed
645# the option to something that was supported.
646#
647# Additionally, we don't want to fallback and/or silently change which compiler
648# flags will be used, since that leads to producing kernels with different
649# security feature characteristics depending on the compiler used. ("But I
650# selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
651#
652# The middle ground is to warn here so that the failed option is obvious, but
653# to let the build fail with bad compiler flags so that we can't produce a
654# kernel when there is a CONFIG and compiler mismatch.
655#
Kees Cook87796572013-12-19 11:35:59 -0800656ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
Kees Cook19952a92013-12-19 11:35:58 -0800657 stackp-flag := -fstack-protector
658 ifeq ($(call cc-option, $(stackp-flag)),)
Jan Beulich6c15b322014-02-25 15:01:48 -0800659 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
Fathi Boudra27b2a492014-02-25 15:01:46 -0800660 -fstack-protector not supported by compiler)
Kees Cook19952a92013-12-19 11:35:58 -0800661 endif
Jan Beulich6c15b322014-02-25 15:01:48 -0800662else
663ifdef CONFIG_CC_STACKPROTECTOR_STRONG
Kees Cook87796572013-12-19 11:35:59 -0800664 stackp-flag := -fstack-protector-strong
665 ifeq ($(call cc-option, $(stackp-flag)),)
666 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
667 -fstack-protector-strong not supported by compiler)
668 endif
Kees Cook19952a92013-12-19 11:35:58 -0800669else
670 # Force off for distro compilers that enable stack protector by default.
671 stackp-flag := $(call cc-option, -fno-stack-protector)
Tejun Heo5d707e92009-02-09 22:17:39 +0900672endif
Jan Beulich6c15b322014-02-25 15:01:48 -0800673endif
Kees Cook19952a92013-12-19 11:35:58 -0800674KBUILD_CFLAGS += $(stackp-flag)
Sam Ravnborge06b8b92008-02-13 22:43:28 +0100675
Behan Webster61163ef2013-09-03 22:27:23 -0400676ifeq ($(COMPILER),clang)
677KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
678KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
679KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
680KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
681KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
682# Quiet clang warning: comparison of unsigned expression < 0 is always false
683KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
684# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
685# source of a reference will be _MergedGlobals and not on of the whitelisted names.
686# See modpost pattern 2
687KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
Behan Webster26ea6bb2014-07-31 21:08:25 -0700688KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
Behan Webster61163ef2013-09-03 22:27:23 -0400689else
690
Dave Jonesaf0e5d52011-04-21 17:28:13 -0400691# This warning generated too much noise in a regular build.
692# Use make W=1 to enable this warning (see scripts/Makefile.build)
Michal Marek8417da6f2011-05-02 12:51:15 +0200693KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
Behan Webster61163ef2013-09-03 22:27:23 -0400694endif
Dave Jonesaf0e5d52011-04-21 17:28:13 -0400695
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696ifdef CONFIG_FRAME_POINTER
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200697KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698else
Rabin Vincent7e9501f2010-08-10 19:20:53 +0100699# Some targets (ARM with Thumb2, for example), can't be built with frame
700# pointers. For those, we don't have FUNCTION_TRACER automatically
701# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
702# incompatible with -fomit-frame-pointer with current GCC, so we don't use
703# -fomit-frame-pointer with FUNCTION_TRACER.
704ifndef CONFIG_FUNCTION_TRACER
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200705KBUILD_CFLAGS += -fomit-frame-pointer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706endif
Rabin Vincent7e9501f2010-08-10 19:20:53 +0100707endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708
Linus Torvalds2062afb2014-07-26 14:52:01 -0700709KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
710
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711ifdef CONFIG_DEBUG_INFO
Andi Kleen866ced92014-07-30 20:50:18 +0200712ifdef CONFIG_DEBUG_INFO_SPLIT
713KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
714else
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200715KBUILD_CFLAGS += -g
Andi Kleen866ced92014-07-30 20:50:18 +0200716endif
Behan Webster22883282014-02-14 15:19:17 -0800717KBUILD_AFLAGS += -Wa,-gdwarf-2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718endif
Andi Kleenbfaf2dd2014-07-30 20:50:19 +0200719ifdef CONFIG_DEBUG_INFO_DWARF4
720KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
721endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722
Andi Kleend6f4ceb2010-07-14 15:43:52 +0200723ifdef CONFIG_DEBUG_INFO_REDUCED
Andi Kleene82c4bb2013-02-07 13:58:40 -0800724KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
725 $(call cc-option,-fno-var-tracking)
Andi Kleend6f4ceb2010-07-14 15:43:52 +0200726endif
727
Steven Rostedt606576c2008-10-06 19:06:12 -0400728ifdef CONFIG_FUNCTION_TRACER
Steven Rostedta2546fa2011-02-09 13:15:59 -0500729ifdef CONFIG_HAVE_FENTRY
730CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
731endif
732KBUILD_CFLAGS += -pg $(CC_USING_FENTRY)
733KBUILD_AFLAGS += $(CC_USING_FENTRY)
Steven Rostedt72441cb2010-10-13 17:12:30 -0400734ifdef CONFIG_DYNAMIC_FTRACE
Steven Rostedtcf4db252010-10-14 23:32:44 -0400735 ifdef CONFIG_HAVE_C_RECORDMCOUNT
Steven Rostedt72441cb2010-10-13 17:12:30 -0400736 BUILD_C_RECORDMCOUNT := y
737 export BUILD_C_RECORDMCOUNT
738 endif
739endif
Arnaldo Carvalho de Melo16444a82008-05-12 21:20:42 +0200740endif
741
Sam Ravnborg91341d42008-01-21 21:31:44 +0100742# We trigger additional mismatches with less inlining
743ifdef CONFIG_DEBUG_SECTION_MISMATCH
744KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
745endif
746
Sam Ravnborge8e69932005-04-30 16:51:42 -0700747# arch Makefile may override CC so keep this after arch Makefile is included
Rik van Riele8f5bdb02005-05-16 21:53:46 -0700748NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
Sam Ravnborge8e69932005-04-30 16:51:42 -0700749CHECKFLAGS += $(NOSTDINC_FLAGS)
750
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751# warn about C99 declaration after statement
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200752KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200754# disable pointer signed / unsigned warnings in gcc 4.0
Michal Marek8417da6f2011-05-02 12:51:15 +0200755KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756
Kirill Smelkovfe8d0a42009-04-09 15:34:34 +0400757# disable invalid "can't wrap" optimizations for signed / pointers
Linus Torvaldsa1378022009-07-12 11:25:04 -0700758KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
Linus Torvaldsd0115552009-03-19 15:53:19 -0700759
Andi Kleen8f7f5c92009-09-18 12:49:37 -0700760# conserve stack if available
761KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
762
Sergei Trofimovich80970472013-09-13 14:51:40 -0700763# disallow errors like 'EXPORT_GPL(foo);' with missing header
764KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
765
766# require functions to have arguments in prototypes, not empty 'int foo()'
767KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
768
Josh Triplettfe7c36c2013-12-23 13:56:06 -0800769# Prohibit date/time macros, which would make the build non-deterministic
770KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
771
Michal Marek40df7592011-04-20 13:45:30 +0200772# use the deterministic mode of AR if available
773KBUILD_ARFLAGS := $(call ar-option,D)
774
Jason Baronbf5438fc2010-09-17 11:09:00 -0400775# check for 'asm goto'
776ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
777 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
778endif
779
Masahiro Yamadaa86fe352014-04-14 18:27:10 +0900780include $(srctree)/scripts/Makefile.extrawarn
781
Sam Ravnborg06c50402007-10-15 22:17:25 +0200782# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
Ozan Çağlayan70cfe022012-08-14 19:00:54 +0300783KBUILD_CPPFLAGS += $(KCPPFLAGS)
784KBUILD_AFLAGS += $(KAFLAGS)
785KBUILD_CFLAGS += $(KCFLAGS)
Sam Ravnborg52bcc332007-10-15 22:03:58 +0200786
Roland McGrath18991192007-07-19 01:48:40 -0700787# Use --build-id when available.
788LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
Sam Ravnborgf86fd302009-09-19 10:14:33 +0200789 $(call cc-ldoption, -Wl$(comma)--build-id,))
Sam Ravnborg65881692010-07-28 17:33:09 +0200790KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
Roland McGrath18991192007-07-19 01:48:40 -0700791LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
792
David Howells5d7d18f2009-03-04 11:59:07 -0800793ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
Andi Kleend79a2712009-09-16 22:36:55 +0200794LDFLAGS_vmlinux += $(call ld-option, -X,)
David Howells5d7d18f2009-03-04 11:59:07 -0800795endif
796
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797# Default kernel image to build when no specific target is given.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200798# KBUILD_IMAGE may be overruled on the command line or
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799# set in the environment
800# Also any assignments in arch/$(ARCH)/Makefile take precedence over
801# this default value
802export KBUILD_IMAGE ?= vmlinux
803
804#
805# INSTALL_PATH specifies where to place the updated kernel and system map
806# images. Default is /boot, but you can set it to other values
807export INSTALL_PATH ?= /boot
808
809#
Jason Cooperf4d4ffc2013-12-01 23:56:28 +0000810# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
811# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
812# an argument if needed. Otherwise it defaults to the kernel install path
813#
814export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
815
816#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
818# relocations required by build roots. This is not defined in the
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200819# makefile but the argument can be passed to make if needed.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820#
821
Sam Ravnborgdf9df032006-01-16 12:46:07 +0100822MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823export MODLIB
824
Theodore Ts'oac031f22006-06-21 20:53:09 -0400825#
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +0900826# INSTALL_MOD_STRIP, if defined, will cause modules to be
827# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
828# the default option --strip-debug will be used. Otherwise,
829# INSTALL_MOD_STRIP value will be used as the options to the strip command.
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100830
Theodore Ts'oac031f22006-06-21 20:53:09 -0400831ifdef INSTALL_MOD_STRIP
832ifeq ($(INSTALL_MOD_STRIP),1)
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100833mod_strip_cmd = $(STRIP) --strip-debug
Theodore Ts'oac031f22006-06-21 20:53:09 -0400834else
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100835mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
Theodore Ts'oac031f22006-06-21 20:53:09 -0400836endif # INSTALL_MOD_STRIP=1
837else
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100838mod_strip_cmd = true
Theodore Ts'oac031f22006-06-21 20:53:09 -0400839endif # INSTALL_MOD_STRIP
840export mod_strip_cmd
841
Bertrand Jacquinbeb50df2014-08-27 20:31:56 +0930842# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
843# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
844# or CONFIG_MODULE_COMPRESS_XZ.
845
846mod_compress_cmd = true
847ifdef CONFIG_MODULE_COMPRESS
848 ifdef CONFIG_MODULE_COMPRESS_GZIP
849 mod_compress_cmd = gzip -n
850 endif # CONFIG_MODULE_COMPRESS_GZIP
851 ifdef CONFIG_MODULE_COMPRESS_XZ
852 mod_compress_cmd = xz
853 endif # CONFIG_MODULE_COMPRESS_XZ
854endif # CONFIG_MODULE_COMPRESS
855export mod_compress_cmd
856
P J P1bf49dd2013-11-12 15:11:44 -0800857# Select initial ramdisk compression format, default is gzip(1).
858# This shall be used by the dracut(8) tool while creating an initramfs image.
859#
Jan Beulich7ac18152013-12-18 17:08:57 -0800860INITRD_COMPRESS-y := gzip
861INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
862INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
863INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
864INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
865INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
Linus Torvaldsb7000ad2013-12-20 16:52:45 -0800866# do not export INITRD_COMPRESS, since we didn't actually
867# choose a sane default compression above.
868# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869
Michal Marekd9d8d7e2013-01-25 13:41:31 +1030870ifdef CONFIG_MODULE_SIG_ALL
Rusty Russelle2a666d2012-10-19 11:53:15 +1030871MODSECKEY = ./signing_key.priv
872MODPUBKEY = ./signing_key.x509
873export MODPUBKEY
Michal Marek4bc94102013-01-25 13:41:12 +1030874mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
Rusty Russelle2a666d2012-10-19 11:53:15 +1030875else
876mod_sign_cmd = true
877endif
878export mod_sign_cmd
879
880
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881ifeq ($(KBUILD_EXTMOD),)
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100882core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883
884vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
885 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
886 $(net-y) $(net-m) $(libs-y) $(libs-m)))
887
888vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
Michal Marek30142232014-10-02 15:27:07 +0200889 $(init-) $(core-) $(drivers-) $(net-) $(libs-))))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890
891init-y := $(patsubst %/, %/built-in.o, $(init-y))
892core-y := $(patsubst %/, %/built-in.o, $(core-y))
893drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
894net-y := $(patsubst %/, %/built-in.o, $(net-y))
895libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
896libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
897libs-y := $(libs-y1) $(libs-y2)
898
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200899# Externally visible symbols (used by link-vmlinux.sh)
Sam Ravnborg95698572012-05-05 10:18:40 +0200900export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
901export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
902export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200903export LDFLAGS_vmlinux
Michal Marek6615d6c2013-04-12 14:12:50 +0200904# used by scripts/pacmage/Makefile
905export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200907vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200909# Final link of vmlinux
910 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
911quiet_cmd_link-vmlinux = LINK $@
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200913# Include targets which we want to
914# execute if the rest of the kernel build went well.
915vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
David Woodhouse0f836e5f2006-10-11 01:21:43 -0700916ifdef CONFIG_HEADERS_CHECK
David Woodhouse0e7af8d042006-10-13 16:04:23 +0100917 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
David Woodhouse0f836e5f2006-10-11 01:21:43 -0700918endif
Mathieu Desnoyers267c4022007-10-18 23:41:07 -0700919ifdef CONFIG_SAMPLES
920 $(Q)$(MAKE) $(build)=samples
921endif
Randy Dunlap3794f3e2008-08-12 15:09:06 -0700922ifdef CONFIG_BUILD_DOCSRC
923 $(Q)$(MAKE) $(build)=Documentation
924endif
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200925 +$(call if_changed,link-vmlinux)
Sam Ravnborg741f98f2007-07-17 10:54:06 +0200926
Masahiro Yamada38385f82014-04-28 16:26:18 +0900927# The actual objects are generated when descending,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928# make sure no implicit rule kicks in
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200929$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930
931# Handle descending into subdirectories listed in $(vmlinux-dirs)
932# Preset locale variables to speed up the build process. Limit locale
933# tweaks to this spot to avoid wrong language settings when running
934# make menuconfig etc.
935# Error messages still appears in the original language
936
Paul Smith4f193362006-03-05 17:14:10 -0500937PHONY += $(vmlinux-dirs)
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200938$(vmlinux-dirs): prepare scripts
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939 $(Q)$(MAKE) $(build)=$@
940
Michal Marek0d0e7712013-07-11 15:34:51 +0200941define filechk_kernel.release
942 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
943endef
944
Geert Uytterhoeven83a35e32013-06-28 11:27:31 +0200945# Store (new) KERNELRELEASE string in include/config/kernel.release
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700946include/config/kernel.release: include/config/auto.conf FORCE
Michal Marek0d0e7712013-07-11 15:34:51 +0200947 $(call filechk,kernel.release)
Sam Ravnborgcb584552006-01-09 21:20:34 +0100948
949
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950# Things we need to do before we recursively start building the kernel
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200951# or the modules are listed in "prepare".
952# A multi level approach is used. prepareN is processed before prepareN-1.
953# archprepare is used in arch Makefiles and when processed asm symlink,
954# version.h and scripts_basic is processed / created.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200956# Listed in dependency order
Paul Smith4f193362006-03-05 17:14:10 -0500957PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200958
Sam Ravnborg86feeaa2005-09-09 19:28:28 +0200959# prepare3 is used to check if we are building in a separate output directory,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960# and if so do:
961# 1) Check that make has not been executed in the kernel src $(srctree)
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700962prepare3: include/config/kernel.release
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963ifneq ($(KBUILD_SRC),)
Mike Frysingerfd54f502008-11-06 03:31:35 -0500964 @$(kecho) ' Using $(srctree) as source for kernel'
Roman Zippelc955cca2006-06-08 22:12:39 -0700965 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
Michal Marek5369f552012-07-07 23:04:40 +0200966 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
967 echo >&2 " in the '$(srctree)' directory.";\
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968 /bin/false; \
969 fi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970endif
971
Sam Ravnborg86feeaa2005-09-09 19:28:28 +0200972# prepare2 creates a makefile if using a separate output directory
Sam Ravnborgd8ecc5c2011-04-27 22:29:49 +0200973prepare2: prepare3 outputmakefile asm-generic
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974
David Howellsd183e6f2012-10-02 18:01:56 +0100975prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
Sam Ravnborgf7f16b72009-10-18 00:00:43 +0200976 include/config/auto.conf
Sam Ravnborg7bb9d092007-10-19 22:20:02 +0200977 $(cmd_crmodverdir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978
H. Peter Anvin6520fe52012-05-08 21:22:24 +0300979archprepare: archheaders archscripts prepare1 scripts_basic
Sam Ravnborg5bb78262005-09-11 22:30:22 +0200980
981prepare0: archprepare FORCE
Sam Ravnborg8d36a622005-09-10 21:05:36 +0200982 $(Q)$(MAKE) $(build)=.
Sam Ravnborg86feeaa2005-09-09 19:28:28 +0200983
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984# All the preparing..
Robert P. J. Dayd395efb2007-02-14 00:33:01 -0800985prepare: prepare0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987# Generate some files
988# ---------------------------------------------------------------------------
989
990# KERNELRELEASE can change from a few different places, meaning version.h
991# needs to be updated, so this check is forced on all builds
992
993uts_len := 64
Sam Ravnborg63104ee2006-07-03 23:30:54 +0200994define filechk_utsrelease.h
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
Sam Ravnborg63104ee2006-07-03 23:30:54 +0200996 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
997 exit 1; \
998 fi; \
999 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000endef
1001
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001002define filechk_version.h
Jesper Juhl450c6072012-02-16 22:49:15 +01001003 (echo \#define LINUX_VERSION_CODE $(shell \
1004 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001005 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1006endef
1007
David Howellsd183e6f2012-10-02 18:01:56 +01001008$(version_h): $(srctree)/Makefile FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009 $(call filechk,version.h)
Michal Marek223c24a2014-11-27 16:13:17 +01001010 $(Q)rm -f $(old_version_h)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011
Sam Ravnborg273b2812009-10-18 00:52:28 +02001012include/generated/utsrelease.h: include/config/kernel.release FORCE
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001013 $(call filechk,utsrelease.h)
1014
Vegard Nossum179efcb2008-12-16 12:33:43 +01001015PHONY += headerdep
1016headerdep:
Peter Foley9663d982011-04-26 17:17:11 -04001017 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1018 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
Vegard Nossum179efcb2008-12-16 12:33:43 +01001019
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020# ---------------------------------------------------------------------------
1021
Paul Smith4f193362006-03-05 17:14:10 -05001022PHONY += depend dep
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023depend dep:
1024 @echo '*** Warning: make $@ is unnecessary now.'
1025
1026# ---------------------------------------------------------------------------
David Woodhouse88ecf812008-05-29 11:01:51 +03001027# Firmware install
1028INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1029export INSTALL_FW_PATH
1030
1031PHONY += firmware_install
1032firmware_install: FORCE
1033 @mkdir -p $(objtree)/firmware
1034 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1035
1036# ---------------------------------------------------------------------------
David Woodhouse8d730cf2006-06-18 11:58:39 +01001037# Kernel headers
David Woodhouse8d730cf2006-06-18 11:58:39 +01001038
Sam Ravnborge6883b12008-06-05 16:43:46 +02001039#Default location for installed headers
1040export INSTALL_HDR_PATH = $(objtree)/usr
1041
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001042# If we do an all arch process set dst to asm-$(hdr-arch)
1043hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
Sam Ravnborge6883b12008-06-05 16:43:46 +02001044
H. Peter Anvin052ad272011-11-17 13:17:35 -08001045PHONY += archheaders
1046archheaders:
1047
H. Peter Anvin6520fe52012-05-08 21:22:24 +03001048PHONY += archscripts
1049archscripts:
1050
Sam Ravnborge6883b12008-06-05 16:43:46 +02001051PHONY += __headers
David Howellsd183e6f2012-10-02 18:01:56 +01001052__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
Mike Waychisone1b702c2011-03-14 23:34:25 -07001053 $(Q)$(MAKE) $(build)=scripts build_unifdef
David Woodhouse6d716272006-09-24 22:16:03 +01001054
1055PHONY += headers_install_all
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001056headers_install_all:
1057 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
David Woodhouse6d716272006-09-24 22:16:03 +01001058
David Woodhouse8d730cf2006-06-18 11:58:39 +01001059PHONY += headers_install
Sam Ravnborge6883b12008-06-05 16:43:46 +02001060headers_install: __headers
David Howells10b63952012-10-02 18:01:57 +01001061 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1062 $(error Headers not exportable for the $(SRCARCH) architecture))
1063 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1064 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
David Woodhouse8d730cf2006-06-18 11:58:39 +01001065
Mike Frysinger1f857122007-02-14 00:33:02 -08001066PHONY += headers_check_all
1067headers_check_all: headers_install_all
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001068 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
Mike Frysinger1f857122007-02-14 00:33:02 -08001069
David Woodhouse68475352006-06-18 12:02:10 +01001070PHONY += headers_check
1071headers_check: headers_install
David Howells10b63952012-10-02 18:01:57 +01001072 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1073 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
David Woodhouse68475352006-06-18 12:02:10 +01001074
David Woodhouse8d730cf2006-06-18 11:58:39 +01001075# ---------------------------------------------------------------------------
Shuah Khan5a5da782014-08-07 13:07:46 -06001076# Kernel selftest
1077
1078PHONY += kselftest
1079kselftest:
1080 $(Q)$(MAKE) -C tools/testing/selftests run_tests
1081
1082# ---------------------------------------------------------------------------
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083# Modules
1084
1085ifdef CONFIG_MODULES
1086
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001087# By default, build modules as well
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088
Michal Marek73d13932010-03-10 12:28:58 +01001089all: modules
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +09001091# Build modules
Tejun Heo551559e2007-12-07 21:04:30 +09001092#
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +09001093# A module can be listed more than once in obj-m resulting in
1094# duplicate lines in modules.order files. Those are removed
1095# using awk while concatenating to the final file.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096
Paul Smith4f193362006-03-05 17:14:10 -05001097PHONY += modules
Michal Marek2da30e72010-06-07 22:22:12 +02001098modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
Tejun Heo551559e2007-12-07 21:04:30 +09001099 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
Mike Frysingerfd54f502008-11-06 03:31:35 -05001100 @$(kecho) ' Building modules, stage 2.';
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001101 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
David Woodhouse44463f72008-07-25 14:17:19 -04001102 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103
Michal Mareka6c36632010-03-08 10:07:12 +01001104modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1105 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1106
Michal Marek73d13932010-03-10 12:28:58 +01001107%/modules.builtin: include/config/auto.conf
Michal Mareka6c36632010-03-08 10:07:12 +01001108 $(Q)$(MAKE) $(modbuiltin)=$*
1109
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110
1111# Target to prepare building external modules
Paul Smith4f193362006-03-05 17:14:10 -05001112PHONY += modules_prepare
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001113modules_prepare: prepare scripts
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114
1115# Target to install modules
Paul Smith4f193362006-03-05 17:14:10 -05001116PHONY += modules_install
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117modules_install: _modinst_ _modinst_post
1118
Paul Smith4f193362006-03-05 17:14:10 -05001119PHONY += _modinst_
Michal Marek2da30e72010-06-07 22:22:12 +02001120_modinst_:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121 @rm -rf $(MODLIB)/kernel
1122 @rm -f $(MODLIB)/source
1123 @mkdir -p $(MODLIB)/kernel
Michal Marek890676c2014-04-25 17:36:14 +02001124 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1126 rm -f $(MODLIB)/build ; \
Michal Marek7e1c0472014-04-25 17:29:45 +02001127 ln -s $(CURDIR) $(MODLIB)/build ; \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128 fi
Tejun Heo551559e2007-12-07 21:04:30 +09001129 @cp -f $(objtree)/modules.order $(MODLIB)/
Michal Marekbc081dd2009-12-07 16:38:33 +01001130 @cp -f $(objtree)/modules.builtin $(MODLIB)/
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001131 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001133# This depmod is only for convenience to give the initial
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134# boot a modules.dep even before / is mounted read-write. However the
1135# boot script depmod is the master version.
Paul Smith4f193362006-03-05 17:14:10 -05001136PHONY += _modinst_post
Linus Torvalds6d128e12013-07-10 19:02:51 -07001137_modinst_post: _modinst_
David Woodhouse88ecf812008-05-29 11:01:51 +03001138 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001139 $(call cmd,depmod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140
Josh Boyerd890f512012-11-05 09:09:24 +10301141ifeq ($(CONFIG_MODULE_SIG), y)
1142PHONY += modules_sign
1143modules_sign:
1144 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1145endif
1146
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147else # CONFIG_MODULES
1148
1149# Modules not configured
1150# ---------------------------------------------------------------------------
1151
1152modules modules_install: FORCE
Michal Marek5369f552012-07-07 23:04:40 +02001153 @echo >&2
1154 @echo >&2 "The present kernel configuration has modules disabled."
1155 @echo >&2 "Type 'make config' and enable loadable module support."
1156 @echo >&2 "Then build a kernel with module support enabled."
1157 @echo >&2
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158 @exit 1
1159
1160endif # CONFIG_MODULES
1161
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162###
1163# Cleaning is done on three levels.
1164# make clean Delete most generated files
1165# Leave enough to build external modules
1166# make mrproper Delete the current configuration, and all generated files
1167# make distclean Remove editor backup files, patch leftover files and the like
1168
1169# Directories & files removed with 'make clean'
1170CLEAN_DIRS += $(MODVERDIR)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171
1172# Directories & files removed with 'make mrproper'
Sam Ravnborgd8ecc5c2011-04-27 22:29:49 +02001173MRPROPER_DIRS += include/config usr/include include/generated \
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +09001174 arch/*/include/generated .tmp_objdiff
David Howellsd183e6f2012-10-02 18:01:56 +01001175MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
Rusty Russelld5b71932012-10-02 14:35:24 +09301176 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1177 signing_key.priv signing_key.x509 x509.genkey \
1178 extra_certificates signing_key.x509.keyid \
Michal Marek223c24a2014-11-27 16:13:17 +01001179 signing_key.x509.signer
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180
1181# clean - Delete most, but leave enough to build external modules
1182#
1183clean: rm-dirs := $(CLEAN_DIRS)
1184clean: rm-files := $(CLEAN_FILES)
Gerard Snitselaarfb68d4b2012-02-04 02:55:59 -07001185clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186
Pawel Mollbd1ee802012-10-29 11:23:02 +00001187PHONY += $(clean-dirs) clean archclean vmlinuxclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188$(clean-dirs):
1189 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1190
Pawel Mollbd1ee802012-10-29 11:23:02 +00001191vmlinuxclean:
1192 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1193
1194clean: archclean vmlinuxclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195
1196# mrproper - Delete all generated files, including .config
1197#
1198mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1199mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1200mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1201
Paul Smith4f193362006-03-05 17:14:10 -05001202PHONY += $(mrproper-dirs) mrproper archmrproper
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203$(mrproper-dirs):
1204 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1205
1206mrproper: clean archmrproper $(mrproper-dirs)
1207 $(call cmd,rmdirs)
1208 $(call cmd,rmfiles)
1209
1210# distclean
1211#
Paul Smith4f193362006-03-05 17:14:10 -05001212PHONY += distclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213
1214distclean: mrproper
1215 @find $(srctree) $(RCS_FIND_IGNORE) \
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001216 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
Masahiro Yamadaa03fcb502014-03-28 16:36:12 +09001218 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219 -type f -print | xargs rm -f
1220
1221
1222# Packaging of the kernel to various formats
1223# ---------------------------------------------------------------------------
1224# rpm target kept for backward compatibility
Michal Marekc79624c2014-07-04 22:53:52 +02001225package-dir := scripts/package
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226
Arnaldo Carvalho de Melobafb6742010-06-07 07:44:25 -03001227%src-pkg: FORCE
1228 $(Q)$(MAKE) $(build)=$(package-dir) $@
Zach Brown031ecc62006-06-08 22:12:37 -07001229%pkg: include/config/kernel.release FORCE
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001230 $(Q)$(MAKE) $(build)=$(package-dir) $@
Zach Brown031ecc62006-06-08 22:12:37 -07001231rpm: include/config/kernel.release FORCE
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001232 $(Q)$(MAKE) $(build)=$(package-dir) $@
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233
1234
1235# Brief documentation of the typical targets used
1236# ---------------------------------------------------------------------------
1237
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001238boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
Konstantin Khlebnikova1e7b7b2014-10-28 17:18:20 +04001239boards := $(sort $(notdir $(boards)))
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001240board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1241board-dirs := $(sort $(notdir $(board-dirs:/=)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242
1243help:
1244 @echo 'Cleaning targets:'
Samuel Tardieu5ea084e2006-12-12 19:09:40 +01001245 @echo ' clean - Remove most generated files but keep the config and'
Jesper Juhl5cc8d242006-09-24 14:01:08 +02001246 @echo ' enough build support to build external modules'
Samuel Tardieu5ea084e2006-12-12 19:09:40 +01001247 @echo ' mrproper - Remove all generated files + config + various backup files'
Jesper Juhl5cc8d242006-09-24 14:01:08 +02001248 @echo ' distclean - mrproper + remove editor backup and patch files'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249 @echo ''
1250 @echo 'Configuration targets:'
1251 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1252 @echo ''
1253 @echo 'Other generic targets:'
1254 @echo ' all - Build all targets marked with [*]'
1255 @echo '* vmlinux - Build the bare kernel'
1256 @echo '* modules - Build all modules'
Bodo Eggert9cc5d742005-11-23 20:11:34 +01001257 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
David Woodhouse88ecf812008-05-29 11:01:51 +03001258 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1259 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260 @echo ' dir/ - Build all files in dir and below'
Joe Perches62718972010-01-13 09:31:44 -08001261 @echo ' dir/file.[oisS] - Build specified target only'
1262 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1263 @echo ' (requires a recent binutils and recent build (System.map))'
Sam Ravnborg155ad602005-07-07 17:56:08 -07001264 @echo ' dir/file.ko - Build module including final link'
Robert P. J. Dayc4d5ee62009-04-24 12:35:23 -04001265 @echo ' modules_prepare - Set up for building external modules'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266 @echo ' tags/TAGS - Generate tags file for editors'
1267 @echo ' cscope - Generate cscope index'
Jianbin Kangf4ed1002011-01-14 20:07:05 +08001268 @echo ' gtags - Generate GNU GLOBAL index'
Michal Marek3f1d9a62014-07-11 15:57:24 +02001269 @echo ' kernelrelease - Output the release version string (use with make -s)'
1270 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1271 @echo ' image_name - Output the image name (use with make -s)'
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001272 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
Geert Uytterhoeven59df3232007-01-29 13:47:01 +01001273 echo ' (default: $(INSTALL_HDR_PATH))'; \
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001274 echo ''
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275 @echo 'Static analysers'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276 @echo ' checkstack - Generate a list of stack hogs'
1277 @echo ' namespacecheck - Name space analysis on compiled kernel'
Sam Ravnborgaa025e72007-11-14 21:34:55 +01001278 @echo ' versioncheck - Sanity check on version.h usage'
Randy Dunlapec2d9872007-11-04 12:01:55 -08001279 @echo ' includecheck - Check for duplicate included header files'
Adrian Bunk295ac052007-08-24 23:04:56 +02001280 @echo ' export_report - List the usages of all exported symbols'
Vegard Nossum179efcb2008-12-16 12:33:43 +01001281 @echo ' headers_check - Sanity check on exported headers'
Nicolas Palix74425ee2010-06-06 17:15:01 +02001282 @echo ' headerdep - Detect inclusion cycles in headers'
1283 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1284 @echo ''
Shuah Khan5a5da782014-08-07 13:07:46 -06001285 @echo 'Kernel selftest'
1286 @echo ' kselftest - Build and run kernel selftest (run as root)'
1287 @echo ' Build, install, and boot kernel before'
1288 @echo ' running kselftest on it'
1289 @echo ''
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290 @echo 'Kernel packaging:'
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001291 @$(MAKE) $(build)=$(package-dir) help
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292 @echo ''
1293 @echo 'Documentation targets:'
1294 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1295 @echo ''
Andres Salomon01dee182008-04-25 22:34:58 -04001296 @echo 'Architecture specific targets ($(SRCARCH)):'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297 @$(if $(archhelp),$(archhelp),\
Andres Salomon01dee182008-04-25 22:34:58 -04001298 echo ' No architecture specific help defined for $(SRCARCH)')
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299 @echo ''
1300 @$(if $(boards), \
1301 $(foreach b, $(boards), \
1302 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1303 echo '')
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001304 @$(if $(board-dirs), \
1305 $(foreach b, $(board-dirs), \
1306 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1307 printf " %-16s - Show all of the above\\n" help-boards; \
1308 echo '')
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309
1310 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
Sam Ravnborg45d506b2006-08-08 21:35:14 +02001311 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
Dustin Kirkland701842e2006-05-23 15:57:23 -05001313 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1314 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
Ingo Molnaraf07ce32011-06-16 13:26:23 +02001315 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
Sam Ravnborg28bc20d2011-04-27 22:15:27 +02001316 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1317 @echo ' 1: warnings which may be relevant and do not occur too often'
1318 @echo ' 2: warnings which occur quite often but may still be relevant'
1319 @echo ' 3: more obscure warnings, can most likely be ignored'
Michal Mareka6de5532011-04-29 14:45:31 +02001320 @echo ' Multiple levels can be combined with W=12 or W=123'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321 @echo ''
1322 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1323 @echo 'For further info see the ./README file'
1324
1325
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001326help-board-dirs := $(addprefix help-,$(board-dirs))
1327
1328help-boards: $(help-board-dirs)
1329
Michal Marekfbae4d52014-11-28 13:31:43 +01001330boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001331
1332$(help-board-dirs): help-%:
1333 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1334 @$(if $(boards-per-dir), \
1335 $(foreach b, $(boards-per-dir), \
1336 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1337 echo '')
1338
1339
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340# Documentation targets
1341# ---------------------------------------------------------------------------
1342%docs: scripts_basic FORCE
Peter Foleybffd2022011-05-02 22:48:03 +02001343 $(Q)$(MAKE) $(build)=scripts build_docproc
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1345
1346else # KBUILD_EXTMOD
1347
1348###
1349# External module support.
1350# When building external modules the kernel used as basis is considered
1351# read-only, and no consistency checks are made and the make
1352# system is not used on the basis kernel. If updates are required
1353# in the basis kernel ordinary make commands (without M=...) must
1354# be used.
1355#
1356# The following are the only valid targets when building external
1357# modules.
1358# make M=dir clean Delete all automatically generated files
1359# make M=dir modules Make all modules in specified dir
1360# make M=dir Same as 'make M=dir modules'
1361# make M=dir modules_install
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001362# Install the modules built in the module directory
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363# Assumes install directory is already created
1364
1365# We are always building modules
1366KBUILD_MODULES := 1
Paul Smith4f193362006-03-05 17:14:10 -05001367PHONY += crmodverdir
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368crmodverdir:
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001369 $(cmd_crmodverdir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370
Paul Smith4f193362006-03-05 17:14:10 -05001371PHONY += $(objtree)/Module.symvers
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372$(objtree)/Module.symvers:
1373 @test -e $(objtree)/Module.symvers || ( \
1374 echo; \
1375 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1376 echo " is missing; modules will have no dependencies and modversions."; \
1377 echo )
1378
1379module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
Paul Smith4f193362006-03-05 17:14:10 -05001380PHONY += $(module-dirs) modules
Linus Torvalds1da177e2005-04-16 15:20:36 -07001381$(module-dirs): crmodverdir $(objtree)/Module.symvers
1382 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1383
1384modules: $(module-dirs)
Mike Frysingerfd54f502008-11-06 03:31:35 -05001385 @$(kecho) ' Building modules, stage 2.';
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001386 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387
Paul Smith4f193362006-03-05 17:14:10 -05001388PHONY += modules_install
Sam Ravnborga67dc212006-01-28 23:51:57 +01001389modules_install: _emodinst_ _emodinst_post
Adrian Bunke6304662006-02-14 15:58:15 +01001390
Paul Smith4f193362006-03-05 17:14:10 -05001391install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1392PHONY += _emodinst_
Sam Ravnborga67dc212006-01-28 23:51:57 +01001393_emodinst_:
Sam Ravnborga67dc212006-01-28 23:51:57 +01001394 $(Q)mkdir -p $(MODLIB)/$(install-dir)
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001395 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396
Paul Smith4f193362006-03-05 17:14:10 -05001397PHONY += _emodinst_post
Sam Ravnborga67dc212006-01-28 23:51:57 +01001398_emodinst_post: _emodinst_
1399 $(call cmd,depmod)
1400
Linus Torvalds1da177e2005-04-16 15:20:36 -07001401clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1402
Paul Smith4f193362006-03-05 17:14:10 -05001403PHONY += $(clean-dirs) clean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001404$(clean-dirs):
1405 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1406
1407clean: rm-dirs := $(MODVERDIR)
Michal Marek88d7be02010-09-06 12:00:08 +02001408clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409
1410help:
1411 @echo ' Building external modules.'
1412 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1413 @echo ''
1414 @echo ' modules - default target, build the module(s)'
1415 @echo ' modules_install - install the module'
1416 @echo ' clean - remove generated files in module directory only'
1417 @echo ''
Sam Ravnborg06300b22006-01-25 07:13:18 +01001418
1419# Dummies...
Paul Smith4f193362006-03-05 17:14:10 -05001420PHONY += prepare scripts
Sam Ravnborg06300b22006-01-25 07:13:18 +01001421prepare: ;
1422scripts: ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423endif # KBUILD_EXTMOD
1424
Michal Marek88d7be02010-09-06 12:00:08 +02001425clean: $(clean-dirs)
1426 $(call cmd,rmdirs)
1427 $(call cmd,rmfiles)
Kevin Cernekee43f67c92011-05-10 15:47:16 -07001428 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
Michal Marek88d7be02010-09-06 12:00:08 +02001429 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
David Howellsaddbcdb2012-09-26 10:09:50 +01001430 -o -name '*.ko.*' \
Andi Kleen866ced92014-07-30 20:50:18 +02001431 -o -name '*.dwo' \
Michal Marek88d7be02010-09-06 12:00:08 +02001432 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1433 -o -name '*.symtypes' -o -name 'modules.order' \
1434 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1435 -o -name '*.gcno' \) -type f -print | xargs rm -f
1436
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437# Generate tags for editors
1438# ---------------------------------------------------------------------------
Sam Ravnborga680eed2008-12-03 22:24:13 +01001439quiet_cmd_tags = GEN $@
1440 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
Linus Torvalds1da177e2005-04-16 15:20:36 -07001441
Jianbin Kangf4ed1002011-01-14 20:07:05 +08001442tags TAGS cscope gtags: FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443 $(call cmd,tags)
1444
Linus Torvalds1da177e2005-04-16 15:20:36 -07001445# Scripts to check various things for consistency
1446# ---------------------------------------------------------------------------
1447
Peter Foley279f3dd2011-04-26 17:15:01 -04001448PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1449
Linus Torvalds1da177e2005-04-16 15:20:36 -07001450includecheck:
Peter Foley436f8762011-04-26 17:18:29 -04001451 find $(srctree)/* $(RCS_FIND_IGNORE) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001452 -name '*.[hcS]' -type f -print | sort \
Geert Uytterhoeven80007432007-11-05 11:51:44 +01001453 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
Linus Torvalds1da177e2005-04-16 15:20:36 -07001454
1455versioncheck:
Peter Foley2ee2d292011-04-26 17:19:28 -04001456 find $(srctree)/* $(RCS_FIND_IGNORE) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457 -name '*.[hcS]' -type f -print | sort \
Geert Uytterhoeven80007432007-11-05 11:51:44 +01001458 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
Linus Torvalds1da177e2005-04-16 15:20:36 -07001459
Nicolas Palix74425ee2010-06-06 17:15:01 +02001460coccicheck:
1461 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1462
Linus Torvalds1da177e2005-04-16 15:20:36 -07001463namespacecheck:
1464 $(PERL) $(srctree)/scripts/namespace.pl
1465
Adrian Bunk295ac052007-08-24 23:04:56 +02001466export_report:
1467 $(PERL) $(srctree)/scripts/export_report.pl
1468
Linus Torvalds1da177e2005-04-16 15:20:36 -07001469endif #ifeq ($(config-targets),1)
1470endif #ifeq ($(mixed-targets),1)
1471
Mike Marciniszync398ff02013-06-24 08:48:37 -04001472PHONY += checkstack kernelrelease kernelversion image_name
Jeff Dikee3ccf6e2006-09-27 01:50:37 -07001473
Jeff Dike011e3a92006-12-13 00:34:12 -08001474# UML needs a little special treatment here. It wants to use the host
1475# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1476# else wants $(ARCH), including people doing cross-builds, which means
1477# that $(SUBARCH) doesn't work here.
1478ifeq ($(ARCH), um)
1479CHECKSTACK_ARCH := $(SUBARCH)
1480else
1481CHECKSTACK_ARCH := $(ARCH)
1482endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483checkstack:
1484 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
Jeff Dike011e3a92006-12-13 00:34:12 -08001485 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486
Amerigo Wang7b8ea532010-08-20 05:36:06 -04001487kernelrelease:
1488 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
Amerigo Wang01ab1782010-06-28 10:45:21 +08001489
Sam Ravnborgcb584552006-01-09 21:20:34 +01001490kernelversion:
Sam Ravnborg2244cbd2006-01-16 12:12:12 +01001491 @echo $(KERNELVERSION)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492
Mike Marciniszync398ff02013-06-24 08:48:37 -04001493image_name:
1494 @echo $(KBUILD_IMAGE)
1495
Borislav Petkovea01fa92012-04-11 18:36:18 +02001496# Clear a bunch of variables before executing the submake
1497tools/: FORCE
David Howellsbf351822012-11-05 21:02:08 +00001498 $(Q)mkdir -p $(objtree)/tools
Borislav Petkova50e4332013-02-20 16:32:28 +01001499 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
Borislav Petkovea01fa92012-04-11 18:36:18 +02001500
1501tools/%: FORCE
David Howellsbf351822012-11-05 21:02:08 +00001502 $(Q)mkdir -p $(objtree)/tools
Borislav Petkova50e4332013-02-20 16:32:28 +01001503 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
Borislav Petkovea01fa92012-04-11 18:36:18 +02001504
Sam Ravnborg06300b22006-01-25 07:13:18 +01001505# Single targets
1506# ---------------------------------------------------------------------------
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001507# Single targets are compatible with:
Robert P. J. Daye1b85132008-02-03 15:14:02 +02001508# - build with mixed source and output
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001509# - build with separate output dir 'make O=...'
1510# - external modules
1511#
1512# target-dir => where to store outputfile
1513# build-dir => directory in kernel source tree to use
Sam Ravnborg06300b22006-01-25 07:13:18 +01001514
Sam Ravnborg06300b22006-01-25 07:13:18 +01001515ifeq ($(KBUILD_EXTMOD),)
Sam Ravnborgaa360872006-04-06 08:25:31 +02001516 build-dir = $(patsubst %/,%,$(dir $@))
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001517 target-dir = $(dir $@)
Sam Ravnborg06300b22006-01-25 07:13:18 +01001518else
1519 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001520 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1521 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
Sam Ravnborg06300b22006-01-25 07:13:18 +01001522endif
1523
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001524%.s: %.c prepare scripts FORCE
1525 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1526%.i: %.c prepare scripts FORCE
1527 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1528%.o: %.c prepare scripts FORCE
1529 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1530%.lst: %.c prepare scripts FORCE
1531 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1532%.s: %.S prepare scripts FORCE
1533 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1534%.o: %.S prepare scripts FORCE
1535 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
Andreas Gruenbacher15fde672006-05-09 20:37:30 +02001536%.symtypes: %.c prepare scripts FORCE
1537 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001538
1539# Modules
Sam Ravnborg31110eb2008-12-13 23:00:45 +01001540/: prepare scripts FORCE
1541 $(cmd_crmodverdir)
1542 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1543 $(build)=$(build-dir)
Peter Foley8e2faea2014-09-25 11:23:58 -07001544# Make sure the latest headers are built for Documentation
1545Documentation/: headers_install
Sam Ravnborg31110eb2008-12-13 23:00:45 +01001546%/: prepare scripts FORCE
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001547 $(cmd_crmodverdir)
Sam Ravnborg06300b22006-01-25 07:13:18 +01001548 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001549 $(build)=$(build-dir)
1550%.ko: prepare scripts FORCE
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001551 $(cmd_crmodverdir)
Sam Ravnborg06300b22006-01-25 07:13:18 +01001552 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001553 $(build)=$(build-dir) $(@:.ko=.o)
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001554 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
Sam Ravnborg06300b22006-01-25 07:13:18 +01001555
Masahiro Yamada38385f82014-04-28 16:26:18 +09001556# FIXME Should go into a make.lib or something
Linus Torvalds1da177e2005-04-16 15:20:36 -07001557# ===========================================================================
1558
1559quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1560 cmd_rmdirs = rm -rf $(rm-dirs)
1561
1562quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1563 cmd_rmfiles = rm -f $(rm-files)
1564
Uwe Kleine-Königbc3c26f2008-04-21 22:53:56 +00001565# Run depmod only if we have System.map and depmod is executable
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001566quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
Michal Marek569658d2011-06-15 22:15:47 +02001567 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
Rusty Russellb92021b2013-03-15 15:04:17 +10301568 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001569
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001570# Create temporary dir for module support files
Sam Ravnborgab19f872007-10-22 11:23:07 +02001571# clean it up only when building all modules
1572cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1573 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001574
Linus Torvalds1da177e2005-04-16 15:20:36 -07001575# read all saved command lines
1576
1577targets := $(wildcard $(sort $(targets)))
1578cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1579
1580ifneq ($(cmd_files),)
1581 $(cmd_files): ; # Do not try to update included dependency files
1582 include $(cmd_files)
1583endif
1584
Linus Torvalds1da177e2005-04-16 15:20:36 -07001585endif # skip-makefile
1586
Paul Smith4f193362006-03-05 17:14:10 -05001587PHONY += FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001588FORCE:
Paul Smith4f193362006-03-05 17:14:10 -05001589
Paul Smith4f193362006-03-05 17:14:10 -05001590# Declare the contents of the .PHONY variable as phony. We keep that
Kirill Smelkovfe8d0a42009-04-09 15:34:34 +04001591# information in a variable so we can use it in if_changed and friends.
Paul Smith4f193362006-03-05 17:14:10 -05001592.PHONY: $(PHONY)