blob: 4901317d22a0605a13c346c3f0613547dcef7f5e [file] [log] [blame]
Linus Torvaldsc517d832015-02-22 18:21:14 -08001VERSION = 4
Linus Torvalds10013542016-10-15 12:17:50 -07002PATCHLEVEL = 9
Greg Kroah-Hartman270f7912020-05-10 10:28:04 +02003SUBLEVEL = 223
Linus Torvalds69973b82016-12-11 11:17:54 -08004EXTRAVERSION =
5NAME = Roaring Lionus
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$(MAKEFLAGS))),)
89 quiet=silent_
Josh Poimboeufafdfe5f2017-01-18 22:16:55 -060090 tools_silent=s
Michal Marek066b7ed2014-07-04 14:29:30 +020091endif
92else # make-3.8x
93ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
94 quiet=silent_
Josh Poimboeufafdfe5f2017-01-18 22:16:55 -060095 tools_silent=-s
Michal Marek066b7ed2014-07-04 14:29:30 +020096endif
97endif
98
99export quiet Q KBUILD_VERBOSE
100
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101# kbuild supports saving output files in a separate directory.
102# To locate output files in a separate directory two syntaxes are supported.
103# In both cases the working directory must be the root of the kernel src.
104# 1) O=
105# Use "make O=dir/to/store/output/files/"
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200106#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107# 2) Set KBUILD_OUTPUT
108# Set the environment variable KBUILD_OUTPUT to point to the directory
109# where the output files shall be placed.
110# export KBUILD_OUTPUT=dir/to/store/output/files/
111# make
112#
113# The O= assignment takes precedence over the KBUILD_OUTPUT environment
114# variable.
115
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116# KBUILD_SRC is set on invocation of make in OBJ directory
117# KBUILD_SRC is not intended to be used by the regular user (for now)
118ifeq ($(KBUILD_SRC),)
119
120# OK, Make called in directory where kernel src resides
121# Do we want to locate output files in a separate directory?
Cheng Renquanb8b06182009-05-26 16:03:07 +0800122ifeq ("$(origin O)", "command line")
123 KBUILD_OUTPUT := $(O)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124endif
125
126# That's our default target when none is given on the command line
Paul Smith4f193362006-03-05 17:14:10 -0500127PHONY := _all
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128_all:
129
Sam Ravnborg1cacc9a2007-12-06 22:20:11 +0100130# Cancel implicit rules on top Makefile
131$(CURDIR)/Makefile Makefile: ;
132
Robert Jarzmik51193b72016-04-02 21:38:53 +0200133ifneq ($(words $(subst :, ,$(CURDIR))), 1)
134 $(error main directory cannot contain spaces nor colons)
135endif
136
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137ifneq ($(KBUILD_OUTPUT),)
138# Invoke a second make in the output directory, passing relevant variables
139# check that the output directory actually exists
140saved-output := $(KBUILD_OUTPUT)
Masahiro Yamada1c9e70a2014-03-31 16:41:36 +0900141KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
142 && /bin/pwd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143$(if $(KBUILD_OUTPUT),, \
Masahiro Yamada1c9e70a2014-03-31 16:41:36 +0900144 $(error failed to create output directory "$(saved-output)"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145
Milton Miller0b357862007-09-21 18:09:02 -0500146PHONY += $(MAKECMDGOALS) sub-make
147
Sam Ravnborg1cacc9a2007-12-06 22:20:11 +0100148$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
Charles Keepax16f89092012-10-15 13:49:12 +0100149 @:
Milton Miller0b357862007-09-21 18:09:02 -0500150
Masahiro Yamada2e8d6962016-03-13 09:13:55 +0900151sub-make:
Masahiro Yamada745a2542014-09-09 20:02:23 +0900152 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
Masahiro Yamadaaa55c8e2014-09-09 20:02:24 +0900153 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154
155# Leave processing to above invocation of make
156skip-makefile := 1
157endif # ifneq ($(KBUILD_OUTPUT),)
158endif # ifeq ($(KBUILD_SRC),)
159
160# We process the rest of the Makefile if this is the final invocation of make
161ifeq ($(skip-makefile),)
162
Masahiro Yamada7ff52572014-09-09 20:02:22 +0900163# Do not print "Entering directory ...",
164# but we want to display it when entering to the output directory
165# so that IDEs/editors are able to understand relative filenames.
166MAKEFLAGS += --no-print-directory
167
Masahiro Yamadaaa55c8e2014-09-09 20:02:24 +0900168# Call a source code checker (by default, "sparse") as part of the
169# C compilation.
170#
171# Use 'make C=1' to enable checking of only re-compiled files.
172# Use 'make C=2' to enable checking of *all* source files, regardless
173# of whether they are re-compiled or not.
174#
175# See the file "Documentation/sparse.txt" for more details, including
176# where to get the "sparse" utility.
177
178ifeq ("$(origin C)", "command line")
179 KBUILD_CHECKSRC = $(C)
180endif
181ifndef KBUILD_CHECKSRC
182 KBUILD_CHECKSRC = 0
183endif
184
185# Use make M=dir to specify directory of external module to build
186# Old syntax make ... SUBDIRS=$PWD is still supported
187# Setting the environment variable KBUILD_EXTMOD take precedence
188ifdef SUBDIRS
189 KBUILD_EXTMOD ?= $(SUBDIRS)
190endif
191
192ifeq ("$(origin M)", "command line")
193 KBUILD_EXTMOD := $(M)
194endif
195
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196# If building an external module we do not care about the all: rule
197# but instead _all depend on modules
Paul Smith4f193362006-03-05 17:14:10 -0500198PHONY += all
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199ifeq ($(KBUILD_EXTMOD),)
200_all: all
201else
202_all: modules
203endif
204
Michal Marek9da07632014-04-25 23:25:18 +0200205ifeq ($(KBUILD_SRC),)
206 # building in the source tree
207 srctree := .
208else
209 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
210 # building in a subdirectory of the source tree
211 srctree := ..
212 else
213 srctree := $(KBUILD_SRC)
214 endif
215endif
Michal Marek7e1c0472014-04-25 17:29:45 +0200216objtree := .
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217src := $(srctree)
218obj := $(objtree)
219
Mattia Dongili0f558c32006-02-19 13:50:37 +0100220VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221
Amerigo Wang11294232009-06-19 03:40:26 -0400222export srctree objtree VPATH
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224# SUBARCH tells the usermode build what the underlying arch is. That is set
225# first, and if a usermode build is happening, the "ARCH=um" on the command
226# line overrides the setting of ARCH below. If a native build is happening,
Masahiro Yamada38385f82014-04-28 16:26:18 +0900227# then ARCH is assigned, getting whatever value it gets normally, and
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228# SUBARCH is subsequently ignored.
229
David Woodhouseffee0de2012-12-20 21:51:55 +0000230SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
231 -e s/sun4u/sparc64/ \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 -e s/arm.*/arm/ -e s/sa110/arm/ \
Linus Torvalds39990b52005-11-11 14:27:32 -0800233 -e s/s390x/s390/ -e s/parisc64/parisc/ \
Paul Mundt236b1952007-11-02 12:22:47 +0900234 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
Will Deaconf1b99392013-01-18 19:00:47 +0000235 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236
237# Cross compiling and selecting different set of gcc/bin-utils
238# ---------------------------------------------------------------------------
239#
240# When performing cross compilation for other architectures ARCH shall be set
241# to the target architecture. (See arch/* for the possibilities).
242# ARCH can be set during invocation of make:
243# make ARCH=ia64
244# Another way is to have ARCH set in the environment.
245# The default ARCH is the host where make is executed.
246
247# CROSS_COMPILE specify the prefix used for all executables used
248# during compilation. Only gcc and related bin-utils executables
249# are prefixed with $(CROSS_COMPILE).
250# CROSS_COMPILE can be set on the command line
251# make CROSS_COMPILE=ia64-linux-
252# Alternatively CROSS_COMPILE can be set in the environment.
Roland McGrath84336462009-12-21 16:24:06 -0800253# A third alternative is to store a setting in .config so that plain
254# "make" in the configured kernel build directory always uses that.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255# Default value for CROSS_COMPILE is not to prefix executables
256# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
Sam Ravnborg2331d1a2009-10-11 23:22:58 +0200257ARCH ?= $(SUBARCH)
Roland McGrath84336462009-12-21 16:24:06 -0800258CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259
260# Architecture as present in compile.h
Thomas Gleixner6752ed92007-10-11 11:11:36 +0200261UTS_MACHINE := $(ARCH)
262SRCARCH := $(ARCH)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263
Sam Ravnborgd746d642007-11-12 20:14:19 +0100264# Additional ARCH settings for x86
265ifeq ($(ARCH),i386)
266 SRCARCH := x86
267endif
268ifeq ($(ARCH),x86_64)
269 SRCARCH := x86
270endif
Sam Ravnborg74b469f2007-10-25 19:42:04 +0200271
Sam Ravnborg5e538792008-12-02 23:17:12 -0800272# Additional ARCH settings for sparc
Namhyung Kime69f58c2010-10-25 05:48:23 +0000273ifeq ($(ARCH),sparc32)
274 SRCARCH := sparc
275endif
Sam Ravnborga439fe52008-07-27 23:00:59 +0200276ifeq ($(ARCH),sparc64)
Sam Ravnborg5e538792008-12-02 23:17:12 -0800277 SRCARCH := sparc
Sam Ravnborga439fe52008-07-27 23:00:59 +0200278endif
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +0200279
Paul Mundt3cc000b2009-04-11 08:39:27 +0900280# Additional ARCH settings for sh
281ifeq ($(ARCH),sh64)
282 SRCARCH := sh
283endif
284
Chris Metcalf18aecc22011-05-04 14:38:26 -0400285# Additional ARCH settings for tile
Chris Metcalf6738d322011-05-25 15:24:00 -0400286ifeq ($(ARCH),tilepro)
287 SRCARCH := tile
288endif
Chris Metcalf18aecc22011-05-04 14:38:26 -0400289ifeq ($(ARCH),tilegx)
290 SRCARCH := tile
291endif
292
Sam Ravnborg5e538792008-12-02 23:17:12 -0800293# Where to locate arch specific headers
294hdr-arch := $(SRCARCH)
295
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700296KCONFIG_CONFIG ?= .config
Ben Gardiner41263fc2010-12-14 11:39:44 -0500297export KCONFIG_CONFIG
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700298
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299# SHELL used by kbuild
300CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
301 else if [ -x /bin/bash ]; then echo /bin/bash; \
302 else echo sh; fi ; fi)
303
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200304HOSTCC = gcc
305HOSTCXX = g++
Matthias Kaehlcke0605d5e2017-06-21 16:28:03 -0700306HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200307HOSTCXXFLAGS = -O2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200309# Decide whether to build built-in, modular, or both.
310# Normally, just do built-in.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311
312KBUILD_MODULES :=
313KBUILD_BUILTIN := 1
314
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +0900315# If we have only "make modules", don't compile built-in objects.
316# When we're building modules with modversions, we need to consider
317# the built-in objects during the descend as well, in order to
318# make sure the checksums are up to date before we record them.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319
320ifeq ($(MAKECMDGOALS),modules)
321 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
322endif
323
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +0900324# If we have "make <whatever> modules", compile modules
325# in addition to whatever we do anyway.
326# Just "make" or "make all" shall build modules as well
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327
328ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
329 KBUILD_MODULES := 1
330endif
331
332ifeq ($(MAKECMDGOALS),)
333 KBUILD_MODULES := 1
334endif
335
Sam Ravnborge579d352005-07-27 08:10:10 +0200336export KBUILD_MODULES KBUILD_BUILTIN
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
338
Sam Ravnborg1cacc9a2007-12-06 22:20:11 +0100339# We need some generic definitions (do not try to remake the file).
Masahiro Yamadaa436bb72015-03-27 20:43:36 +0900340scripts/Kbuild.include: ;
341include scripts/Kbuild.include
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342
343# Make variables (CC, etc...)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344AS = $(CROSS_COMPILE)as
345LD = $(CROSS_COMPILE)ld
346CC = $(CROSS_COMPILE)gcc
347CPP = $(CC) -E
348AR = $(CROSS_COMPILE)ar
349NM = $(CROSS_COMPILE)nm
350STRIP = $(CROSS_COMPILE)strip
351OBJCOPY = $(CROSS_COMPILE)objcopy
352OBJDUMP = $(CROSS_COMPILE)objdump
353AWK = awk
354GENKSYMS = scripts/genksyms/genksyms
Sam Ravnborgcaa27b62009-07-20 21:37:11 +0200355INSTALLKERNEL := installkernel
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356DEPMOD = /sbin/depmod
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357PERL = perl
Masahiro Yamada011bf122014-07-18 13:40:11 +0900358PYTHON = python
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359CHECK = sparse
360
Hannes Eder80a7d1d92008-12-27 22:38:44 +0100361CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
362 -Wbitwise -Wno-return-void $(CF)
Michal Marekb36fad62016-06-07 11:57:02 +0200363NOSTDINC_FLAGS =
Sam Ravnborg65881692010-07-28 17:33:09 +0200364CFLAGS_MODULE =
365AFLAGS_MODULE =
366LDFLAGS_MODULE =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367CFLAGS_KERNEL =
368AFLAGS_KERNEL =
Michal Marekb36fad62016-06-07 11:57:02 +0200369LDFLAGS_vmlinux =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370
David Howellsabbf1592012-10-02 18:01:26 +0100371# Use USERINCLUDE when you must reference the UAPI directories only.
372USERINCLUDE := \
373 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
Arnd Bergmann3308b282016-06-15 17:45:45 +0200374 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
David Howellsabbf1592012-10-02 18:01:26 +0100375 -I$(srctree)/include/uapi \
Arnd Bergmann3308b282016-06-15 17:45:45 +0200376 -I$(objtree)/include/generated/uapi \
David Howellsabbf1592012-10-02 18:01:26 +0100377 -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/$(hdr-arch)/include \
Arnd Bergmann3308b282016-06-15 17:45:45 +0200383 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
384 -I$(objtree)/arch/$(hdr-arch)/include/generated \
David Howellsabbf1592012-10-02 18:01:26 +0100385 $(if $(KBUILD_SRC), -I$(srctree)/include) \
Arnd Bergmann3308b282016-06-15 17:45:45 +0200386 -I$(objtree)/include
Arnd Bergmanndc33db72016-06-15 17:45:44 +0200387
388LINUXINCLUDE += $(filter-out $(LINUXINCLUDE),$(USERINCLUDE))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389
Masahiro Yamada97c66872017-10-12 18:22:25 +0900390KBUILD_AFLAGS := -D__ASSEMBLY__
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200391KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
Arnd Bergmann86e51432017-07-26 15:36:23 +0200392 -fno-strict-aliasing -fno-common -fshort-wchar \
Floris Kraaka8735822009-06-15 08:54:02 +0300393 -Werror-implicit-function-declaration \
Kirill A. Shutemov51b97e32014-10-20 12:23:12 +0300394 -Wno-format-security \
Masahiro Yamada97c66872017-10-12 18:22:25 +0900395 -std=gnu89
396KBUILD_CPPFLAGS := -D__KERNEL__
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200397KBUILD_AFLAGS_KERNEL :=
398KBUILD_CFLAGS_KERNEL :=
Sam Ravnborg65881692010-07-28 17:33:09 +0200399KBUILD_AFLAGS_MODULE := -DMODULE
400KBUILD_CFLAGS_MODULE := -DMODULE
401KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
Masahiro Yamada97c66872017-10-12 18:22:25 +0900402GCC_PLUGINS_CFLAGS :=
Masahiro Yamada757ee022019-07-29 18:15:17 +0900403CLANG_FLAGS :=
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700405# Read KERNELRELEASE from include/config/kernel.release (if it exists)
406KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
Michal Marekcacd54e2011-05-30 13:36:07 +0200407KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
Sam Ravnborgcb584552006-01-09 21:20:34 +0100408
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200409export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
Sam Ravnborg80ef88d2007-11-17 15:37:31 +0100410export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
Sam Ravnborgcaa27b62009-07-20 21:37:11 +0200411export CPP AR NM STRIP OBJCOPY OBJDUMP
Masahiro Yamada011bf122014-07-18 13:40:11 +0900412export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200413export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414
Sam Ravnborg06c50402007-10-15 22:17:25 +0200415export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
Andrey Konovalov76b6f302018-02-06 15:36:00 -0800416export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
417export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
Sam Ravnborg222d3942007-10-15 21:59:31 +0200418export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
Sam Ravnborg65881692010-07-28 17:33:09 +0200419export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200420export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
Michal Marek40df7592011-04-20 13:45:30 +0200421export KBUILD_ARFLAGS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422
423# When compiling out-of-tree modules, put MODVERDIR in the module
424# tree rather than in the kernel tree. The kernel tree might
425# even be read-only.
426export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
427
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428# Files to ignore in find ... statements
429
Prarit Bhargavaae63b2d2014-02-06 07:51:42 -0500430export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
431 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
432 -prune -o
Jesper Juhl450c6072012-02-16 22:49:15 +0100433export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
434 --exclude CVS --exclude .pc --exclude .hg --exclude .git
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435
436# ===========================================================================
437# Rules shared between *config targets and build targets
438
439# Basic helpers built in scripts/
Paul Smith4f193362006-03-05 17:14:10 -0500440PHONY += scripts_basic
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441scripts_basic:
442 $(Q)$(MAKE) $(build)=scripts/basic
Steven Rostedt638adb02009-11-17 10:48:25 -0500443 $(Q)rm -f .tmp_quiet_recordmcount
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444
Jan Beulichcd05e6b2005-09-06 11:47:04 +0200445# To avoid any implicit rule to kick in, define an empty command.
446scripts/basic/%: scripts_basic ;
447
Paul Smith4f193362006-03-05 17:14:10 -0500448PHONY += outputmakefile
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200449# outputmakefile generates a Makefile in the output directory, if using a
450# separate output directory. This allows convenient use of make in the
451# output directory.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452outputmakefile:
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200453ifneq ($(KBUILD_SRC),)
Andi Kleen92979992009-01-10 04:56:13 +0100454 $(Q)ln -fsn $(srctree) source
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200455 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
456 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
457endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458
Sam Ravnborgd8ecc5c2011-04-27 22:29:49 +0200459# Support for using generic headers in asm-generic
460PHONY += asm-generic
461asm-generic:
462 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
Catalin Marinas3c5994c2012-10-17 12:25:44 +0100463 src=asm obj=arch/$(SRCARCH)/include/generated/asm
464 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
465 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
Sam Ravnborgd8ecc5c2011-04-27 22:29:49 +0200466
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467# To make sure we do not include .config for any of the *config targets
468# catch them early, and hand them over to scripts/kconfig/Makefile
469# It is allowed to specify more targets when calling make, including
470# mixing *config targets and build targets.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200471# For example 'make oldconfig all'.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472# Detect when mixed targets is specified, and make a second invocation
473# of make so .config is not included in this case either (for *config).
474
David Howells10b63952012-10-02 18:01:57 +0100475version_h := include/generated/uapi/linux/version.h
Michal Marek223c24a2014-11-27 16:13:17 +0100476old_version_h := include/linux/version.h
David Howellsd183e6f2012-10-02 18:01:56 +0100477
Roman Zippel3eb3c742007-01-10 14:45:28 +0100478no-dot-config-targets := clean mrproper distclean \
Michal Marekfbae4d52014-11-28 13:31:43 +0100479 cscope gtags TAGS tags help% %docs check% coccicheck \
David Howellsd183e6f2012-10-02 18:01:56 +0100480 $(version_h) headers_% archheaders archscripts \
Linus Torvalds4aed2fd2010-08-06 09:30:52 -0700481 kernelversion %src-pkg
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482
483config-targets := 0
484mixed-targets := 0
485dot-config := 1
486
487ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
488 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
489 dot-config := 0
490 endif
491endif
492
493ifeq ($(KBUILD_EXTMOD),)
494 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
495 config-targets := 1
Masahiro Yamadad0d38cd2014-12-11 19:12:34 +0900496 ifneq ($(words $(MAKECMDGOALS)),1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 mixed-targets := 1
498 endif
499 endif
500endif
Michal Mareka85a41e2015-12-10 15:53:06 +0100501# install and module_install need also be processed one by one
502ifneq ($(filter install,$(MAKECMDGOALS)),)
503 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
504 mixed-targets := 1
505 endif
506endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507
Chris Fries740f1402018-12-03 11:56:19 -0800508ifeq ($(cc-name),clang)
509ifneq ($(CROSS_COMPILE),)
Masahiro Yamada757ee022019-07-29 18:15:17 +0900510CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
Nick Desaulniers1347aa22019-02-11 11:30:04 -0800511GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
Masahiro Yamada8ff3c2e2018-11-06 12:04:55 +0900512CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)
Stefan Agner4c219af2018-12-05 16:45:26 -0800513GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
Chris Fries740f1402018-12-03 11:56:19 -0800514endif
515ifneq ($(GCC_TOOLCHAIN),)
Masahiro Yamada8ff3c2e2018-11-06 12:04:55 +0900516CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
Chris Fries740f1402018-12-03 11:56:19 -0800517endif
Masahiro Yamada8ff3c2e2018-11-06 12:04:55 +0900518CLANG_FLAGS += -no-integrated-as
Nathan Chancellor7caebf62019-06-11 11:43:31 -0700519CLANG_FLAGS += -Werror=unknown-warning-option
Masahiro Yamada8ff3c2e2018-11-06 12:04:55 +0900520KBUILD_CFLAGS += $(CLANG_FLAGS)
521KBUILD_AFLAGS += $(CLANG_FLAGS)
Chris Fries740f1402018-12-03 11:56:19 -0800522endif
523
524
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525ifeq ($(mixed-targets),1)
526# ===========================================================================
527# We're called with mixed targets (*config and build targets).
528# Handle them one by one.
529
Masahiro Yamada9319f452014-04-09 15:51:35 +0900530PHONY += $(MAKECMDGOALS) __build_one_by_one
531
532$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
533 @:
534
535__build_one_by_one:
536 $(Q)set -e; \
537 for i in $(MAKECMDGOALS); do \
538 $(MAKE) -f $(srctree)/Makefile $$i; \
539 done
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540
541else
542ifeq ($(config-targets),1)
543# ===========================================================================
544# *config targets only - make sure prerequisites are updated, and descend
545# in scripts/kconfig to make the *config target
546
547# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
548# KBUILD_DEFCONFIG may point out an alternative default configuration
549# used for 'make defconfig'
Masahiro Yamadaa436bb72015-03-27 20:43:36 +0900550include arch/$(SRCARCH)/Makefile
Al Viro61bee202008-08-25 04:51:27 -0400551export KBUILD_DEFCONFIG KBUILD_KCONFIG
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552
Sam Ravnborg31110eb2008-12-13 23:00:45 +0100553config: scripts_basic outputmakefile FORCE
Sam Ravnborg31110eb2008-12-13 23:00:45 +0100554 $(Q)$(MAKE) $(build)=scripts/kconfig $@
555
556%config: scripts_basic outputmakefile FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 $(Q)$(MAKE) $(build)=scripts/kconfig $@
558
559else
560# ===========================================================================
561# Build targets only - this includes vmlinux, arch specific targets, clean
562# targets and others. In general all targets except *config targets.
563
564ifeq ($(KBUILD_EXTMOD),)
565# Additional helpers built in scripts/
566# Carefully list dependencies so we do not try to build scripts twice
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200567# in parallel
Paul Smith4f193362006-03-05 17:14:10 -0500568PHONY += scripts
Andreas Schwaba54292f2013-04-09 19:57:00 +0200569scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
Emese Revfy6b90bd42016-05-24 00:09:38 +0200570 asm-generic gcc-plugins
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 $(Q)$(MAKE) $(build)=$(@)
572
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573# Objects we will link into vmlinux / subdirs we need to visit
574init-y := init/
David Woodhouse4d2acfb2008-05-23 13:58:12 +0100575drivers-y := drivers/ sound/ firmware/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576net-y := net/
577libs-y := lib/
578core-y := usr/
Feng Wu37d9fe42015-09-22 16:47:29 +0800579virt-y := virt/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580endif # KBUILD_EXTMOD
581
582ifeq ($(dot-config),1)
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200583# Read in config
584-include include/config/auto.conf
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200586ifeq ($(KBUILD_EXTMOD),)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587# Read in dependencies to all Kconfig* files, make sure to run
588# oldconfig if changes are detected.
Roman Zippelc955cca2006-06-08 22:12:39 -0700589-include include/config/auto.conf.cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591# To avoid any implicit rule to kick in, define an empty command
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700592$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593
Roman Zippelc955cca2006-06-08 22:12:39 -0700594# If .config is newer than include/config/auto.conf, someone tinkered
Sam Ravnborg752625c2005-12-26 23:34:03 +0100595# with it and forgot to run make oldconfig.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200596# if auto.conf.cmd is missing then we are probably in a cleaned tree so
Sam Ravnborg752625c2005-12-26 23:34:03 +0100597# we execute the config step to be sure to catch updated Kconfig files
Michal Marekbc081dd2009-12-07 16:38:33 +0100598include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
600else
Sam Ravnborg264a2682009-10-18 00:49:24 +0200601# external modules needs include/generated/autoconf.h and include/config/auto.conf
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200602# but do not care if they are up-to-date. Use auto.conf to trigger the test
603PHONY += include/config/auto.conf
604
605include/config/auto.conf:
Sam Ravnborg264a2682009-10-18 00:49:24 +0200606 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
Michal Marek5369f552012-07-07 23:04:40 +0200607 echo >&2; \
608 echo >&2 " ERROR: Kernel configuration is invalid."; \
609 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
610 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
611 echo >&2 ; \
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200612 /bin/false)
613
614endif # KBUILD_EXTMOD
Roman Zippelc955cca2006-06-08 22:12:39 -0700615
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616else
617# Dummy target needed, because used as prerequisite
Roman Zippelc955cca2006-06-08 22:12:39 -0700618include/config/auto.conf: ;
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200619endif # $(dot-config)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620
Nicolas Pitre86556392016-12-02 15:11:50 -0500621# For the kernel to actually contain only the needed exported symbols,
622# we have to build modules as well to determine what those symbols are.
623# (this can be evaluated only once include/config/auto.conf has been included)
624ifdef CONFIG_TRIM_UNUSED_KSYMS
625 KBUILD_MODULES := 1
626endif
627
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628# The all: target is the default when no target is given on the
629# command line.
630# This allow a user to issue only 'make' to build a kernel including modules
Michal Marekc8447162010-06-03 10:54:58 +0200631# Defaults to vmlinux, but the arch makefile usually adds further targets
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632all: vmlinux
633
Masahiro Yamada97c66872017-10-12 18:22:25 +0900634KBUILD_CFLAGS += $(call cc-option,-fno-PIE)
635KBUILD_AFLAGS += $(call cc-option,-fno-PIE)
636CFLAGS_GCOV := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
637CFLAGS_KCOV := $(call cc-option,-fsanitize-coverage=trace-pc,)
638export CFLAGS_GCOV CFLAGS_KCOV
639
Michal Marek6dd3f132015-07-16 18:23:53 +0200640# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
641# values of the respective KBUILD_* variables
642ARCH_CPPFLAGS :=
643ARCH_AFLAGS :=
644ARCH_CFLAGS :=
Masahiro Yamadaa436bb72015-03-27 20:43:36 +0900645include arch/$(SRCARCH)/Makefile
Geert Uytterhoevena1c48bb2014-05-27 09:54:12 +0200646
647KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
Linus Torvaldsef6000b2016-10-12 10:23:41 -0700648KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
Linus Torvalds78fbe212017-07-12 19:25:47 -0700649KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
650KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
651KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context)
Linus Torvalds7601d812019-05-01 11:05:41 -0700652KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
Arnd Bergmannb1a1d9b2018-07-26 10:13:22 +0200653KBUILD_CFLAGS += $(call cc-disable-warning, attribute-alias)
Geert Uytterhoevena1c48bb2014-05-27 09:54:12 +0200654
Nicholas Pigginb67067f2016-08-24 22:29:20 +1000655ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
656KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,)
657KBUILD_CFLAGS += $(call cc-option,-fdata-sections,)
658endif
659
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
Masahiro Yamadac0138cf2019-02-21 13:13:38 +0900661KBUILD_CFLAGS += -Os
Arnd Bergmann815eb712016-04-25 17:35:28 +0200662else
663KBUILD_CFLAGS += -O2
664endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665
Jiri Kosina69102312014-08-06 16:08:43 -0700666# Tell gcc to never replace conditional load with a non-conditional one
667KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
668
Gleb Fotengauer-Malinovskiy21eaaa72017-03-20 20:15:53 +0300669# check for 'asm goto'
670ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
671 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
672 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
673endif
674
Emese Revfy6b90bd42016-05-24 00:09:38 +0200675include scripts/Makefile.gcc-plugins
676
Andi Kleen1873e872012-03-28 11:51:18 -0700677ifdef CONFIG_READABLE_ASM
678# Disable optimizations that make assembler listings hard to read.
679# reorder blocks reorders the control in the function
680# ipa clone creates specialized cloned functions
681# partial inlining inlines only parts of functions
682KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
683 $(call cc-option,-fno-ipa-cp-clone,) \
684 $(call cc-option,-fno-partial-inlining)
685endif
686
Mike Frysinger08f67462009-06-04 16:29:08 -0700687ifneq ($(CONFIG_FRAME_WARN),0)
Andi Kleen35bb5b12008-02-22 15:15:03 +0100688KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
689endif
690
Kees Cookc965b102016-07-26 15:21:17 -0700691# This selects the stack protector compiler flag. Testing it is delayed
692# until after .config has been reprocessed, in the prepare-compiler-check
693# target.
Kees Cook87796572013-12-19 11:35:59 -0800694ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
Kees Cook19952a92013-12-19 11:35:58 -0800695 stackp-flag := -fstack-protector
Kees Cookc965b102016-07-26 15:21:17 -0700696 stackp-name := REGULAR
Jan Beulich6c15b322014-02-25 15:01:48 -0800697else
698ifdef CONFIG_CC_STACKPROTECTOR_STRONG
Kees Cook87796572013-12-19 11:35:59 -0800699 stackp-flag := -fstack-protector-strong
Kees Cookc965b102016-07-26 15:21:17 -0700700 stackp-name := STRONG
Kees Cook19952a92013-12-19 11:35:58 -0800701else
702 # Force off for distro compilers that enable stack protector by default.
703 stackp-flag := $(call cc-option, -fno-stack-protector)
Tejun Heo5d707e92009-02-09 22:17:39 +0900704endif
Jan Beulich6c15b322014-02-25 15:01:48 -0800705endif
Kees Cookc965b102016-07-26 15:21:17 -0700706# Find arch-specific stack protector compiler sanity-checking script.
707ifdef CONFIG_CC_STACKPROTECTOR
Kees Cook228d96c2016-07-26 14:26:20 -0700708 stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
709 stackp-check := $(wildcard $(stackp-path))
Kees Cookc965b102016-07-26 15:21:17 -0700710endif
Kees Cook19952a92013-12-19 11:35:58 -0800711KBUILD_CFLAGS += $(stackp-flag)
Sam Ravnborge06b8b92008-02-13 22:43:28 +0100712
Masahiro Yamadab098b022017-11-27 21:15:13 +0900713ifeq ($(cc-name),clang)
714KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
Masahiro Yamadab098b022017-11-27 21:15:13 +0900715KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
716KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
Masahiro Yamadab098b022017-11-27 21:15:13 +0900717# Quiet clang warning: comparison of unsigned expression < 0 is always false
718KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
719# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
720# source of a reference will be _MergedGlobals and not on of the whitelisted names.
721# See modpost pattern 2
722KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
723KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
Masahiro Yamadab098b022017-11-27 21:15:13 +0900724else
725
726# These warnings generated too much noise in a regular build.
727# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
728KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
Masahiro Yamadab098b022017-11-27 21:15:13 +0900729endif
730
Sodagudi Prasad9362c082018-02-06 15:46:51 -0800731KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732ifdef CONFIG_FRAME_POINTER
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200733KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734else
Rabin Vincent7e9501f2010-08-10 19:20:53 +0100735# Some targets (ARM with Thumb2, for example), can't be built with frame
736# pointers. For those, we don't have FUNCTION_TRACER automatically
737# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
738# incompatible with -fomit-frame-pointer with current GCC, so we don't use
739# -fomit-frame-pointer with FUNCTION_TRACER.
740ifndef CONFIG_FUNCTION_TRACER
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200741KBUILD_CFLAGS += -fomit-frame-pointer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742endif
Rabin Vincent7e9501f2010-08-10 19:20:53 +0100743endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744
Linus Torvalds2062afb2014-07-26 14:52:01 -0700745KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
746
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747ifdef CONFIG_DEBUG_INFO
Andi Kleen866ced92014-07-30 20:50:18 +0200748ifdef CONFIG_DEBUG_INFO_SPLIT
749KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
750else
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200751KBUILD_CFLAGS += -g
Andi Kleen866ced92014-07-30 20:50:18 +0200752endif
Behan Webster22883282014-02-14 15:19:17 -0800753KBUILD_AFLAGS += -Wa,-gdwarf-2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754endif
Andi Kleenbfaf2dd2014-07-30 20:50:19 +0200755ifdef CONFIG_DEBUG_INFO_DWARF4
756KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
757endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758
Andi Kleend6f4ceb2010-07-14 15:43:52 +0200759ifdef CONFIG_DEBUG_INFO_REDUCED
Andi Kleene82c4bb2013-02-07 13:58:40 -0800760KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
761 $(call cc-option,-fno-var-tracking)
Andi Kleend6f4ceb2010-07-14 15:43:52 +0200762endif
763
Steven Rostedt606576c2008-10-06 19:06:12 -0400764ifdef CONFIG_FUNCTION_TRACER
Heiko Carstensc0a80c02015-01-09 13:06:33 +0100765ifndef CC_FLAGS_FTRACE
766CC_FLAGS_FTRACE := -pg
767endif
768export CC_FLAGS_FTRACE
Steven Rostedta2546fa2011-02-09 13:15:59 -0500769ifdef CONFIG_HAVE_FENTRY
770CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
771endif
Heiko Carstensc0a80c02015-01-09 13:06:33 +0100772KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
Steven Rostedta2546fa2011-02-09 13:15:59 -0500773KBUILD_AFLAGS += $(CC_USING_FENTRY)
Steven Rostedt72441cb2010-10-13 17:12:30 -0400774ifdef CONFIG_DYNAMIC_FTRACE
Steven Rostedtcf4db252010-10-14 23:32:44 -0400775 ifdef CONFIG_HAVE_C_RECORDMCOUNT
Steven Rostedt72441cb2010-10-13 17:12:30 -0400776 BUILD_C_RECORDMCOUNT := y
777 export BUILD_C_RECORDMCOUNT
778 endif
779endif
Arnaldo Carvalho de Melo16444a82008-05-12 21:20:42 +0200780endif
781
Sam Ravnborg91341d42008-01-21 21:31:44 +0100782# We trigger additional mismatches with less inlining
783ifdef CONFIG_DEBUG_SECTION_MISMATCH
784KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
785endif
786
Sam Ravnborge8e69932005-04-30 16:51:42 -0700787# arch Makefile may override CC so keep this after arch Makefile is included
Rik van Riele8f5bdb02005-05-16 21:53:46 -0700788NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
Sam Ravnborge8e69932005-04-30 16:51:42 -0700789CHECKFLAGS += $(NOSTDINC_FLAGS)
790
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791# warn about C99 declaration after statement
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200792KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200794# disable pointer signed / unsigned warnings in gcc 4.0
Michal Marek8417da6f2011-05-02 12:51:15 +0200795KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796
Stephen Rothwell5e2669c2018-08-31 07:47:28 +1000797# disable stringop warnings in gcc 8+
798KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
799
Linus Torvalds207ad342020-05-09 14:30:29 -0700800# We'll want to enable this eventually, but it's not going away for 5.7 at least
801KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
Linus Torvalds55e8e4b2020-05-09 14:52:44 -0700802KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
Linus Torvalds01d51bb2020-05-09 15:40:52 -0700803KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
Linus Torvalds207ad342020-05-09 14:30:29 -0700804
Linus Torvalds9799d952020-05-09 15:45:21 -0700805# Another good warning that we'll want to enable eventually
806KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
807
Linus Torvaldsce9f4112020-05-09 13:57:10 -0700808# Enabled with W=2, disabled by default as noisy
809KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
810
Kirill Smelkovfe8d0a42009-04-09 15:34:34 +0400811# disable invalid "can't wrap" optimizations for signed / pointers
Linus Torvaldsa1378022009-07-12 11:25:04 -0700812KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
Linus Torvaldsd0115552009-03-19 15:53:19 -0700813
Daniel Borkmann733a4e12018-03-21 01:18:24 +0100814# clang sets -fmerge-all-constants by default as optimization, but this
815# is non-conforming behavior for C and in fact breaks the kernel, so we
816# need to disable it here generally.
817KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants)
818
819# for gcc -fno-merge-all-constants disables everything, but it is fine
820# to have actual conforming behavior enabled.
821KBUILD_CFLAGS += $(call cc-option,-fmerge-constants)
822
Linus Torvaldsb929ccc2017-12-29 17:34:43 -0800823# Make sure -fstack-check isn't enabled (like gentoo apparently did)
824KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,)
825
Andi Kleen8f7f5c92009-09-18 12:49:37 -0700826# conserve stack if available
827KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
828
Sergei Trofimovich80970472013-09-13 14:51:40 -0700829# disallow errors like 'EXPORT_GPL(foo);' with missing header
830KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
831
832# require functions to have arguments in prototypes, not empty 'int foo()'
833KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
834
Josh Triplettfe7c36c2013-12-23 13:56:06 -0800835# Prohibit date/time macros, which would make the build non-deterministic
836KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
837
Daniel Wagnerea8daa72016-03-08 09:29:09 +0100838# enforce correct pointer usage
839KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
840
Kees Cooka250cab2017-03-20 17:14:11 -0700841# Require designated initializers for all marked structures
842KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
843
Masahiro Yamada2e1dff72018-03-30 13:15:26 +0900844# change __FILE__ to the relative path from the srctree
845KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
846
Seth Forshee0446b032019-07-17 11:06:26 -0500847# ensure -fcf-protection is disabled when using retpoline as it is
848# incompatible with -mindirect-branch=thunk-extern
849ifdef CONFIG_RETPOLINE
850KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
851endif
852
Michal Marek40df7592011-04-20 13:45:30 +0200853# use the deterministic mode of AR if available
854KBUILD_ARFLAGS := $(call ar-option,D)
855
Masahiro Yamadaa436bb72015-03-27 20:43:36 +0900856include scripts/Makefile.kasan
857include scripts/Makefile.extrawarn
Andrey Ryabininc6d30852016-01-20 15:00:55 -0800858include scripts/Makefile.ubsan
Masahiro Yamadaa86fe352014-04-14 18:27:10 +0900859
Michal Marek61754c12015-07-01 17:19:30 +0200860# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
861# last assignments
862KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
863KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
864KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
Sam Ravnborg52bcc332007-10-15 22:03:58 +0200865
Roland McGrath18991192007-07-19 01:48:40 -0700866# Use --build-id when available.
867LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
Sam Ravnborgf86fd302009-09-19 10:14:33 +0200868 $(call cc-ldoption, -Wl$(comma)--build-id,))
Sam Ravnborg65881692010-07-28 17:33:09 +0200869KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
Roland McGrath18991192007-07-19 01:48:40 -0700870LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
871
Nicholas Pigginb67067f2016-08-24 22:29:20 +1000872ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
873LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
874endif
875
David Howells5d7d18f2009-03-04 11:59:07 -0800876ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
Andi Kleend79a2712009-09-16 22:36:55 +0200877LDFLAGS_vmlinux += $(call ld-option, -X,)
David Howells5d7d18f2009-03-04 11:59:07 -0800878endif
879
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880# Default kernel image to build when no specific target is given.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200881# KBUILD_IMAGE may be overruled on the command line or
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882# set in the environment
883# Also any assignments in arch/$(ARCH)/Makefile take precedence over
884# this default value
885export KBUILD_IMAGE ?= vmlinux
886
887#
888# INSTALL_PATH specifies where to place the updated kernel and system map
889# images. Default is /boot, but you can set it to other values
890export INSTALL_PATH ?= /boot
891
892#
Jason Cooperf4d4ffc2013-12-01 23:56:28 +0000893# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
894# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
895# an argument if needed. Otherwise it defaults to the kernel install path
896#
897export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
898
899#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
901# relocations required by build roots. This is not defined in the
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200902# makefile but the argument can be passed to make if needed.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903#
904
Sam Ravnborgdf9df032006-01-16 12:46:07 +0100905MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906export MODLIB
907
Theodore Ts'oac031f22006-06-21 20:53:09 -0400908#
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +0900909# INSTALL_MOD_STRIP, if defined, will cause modules to be
910# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
911# the default option --strip-debug will be used. Otherwise,
912# INSTALL_MOD_STRIP value will be used as the options to the strip command.
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100913
Theodore Ts'oac031f22006-06-21 20:53:09 -0400914ifdef INSTALL_MOD_STRIP
915ifeq ($(INSTALL_MOD_STRIP),1)
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100916mod_strip_cmd = $(STRIP) --strip-debug
Theodore Ts'oac031f22006-06-21 20:53:09 -0400917else
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100918mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
Theodore Ts'oac031f22006-06-21 20:53:09 -0400919endif # INSTALL_MOD_STRIP=1
920else
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100921mod_strip_cmd = true
Theodore Ts'oac031f22006-06-21 20:53:09 -0400922endif # INSTALL_MOD_STRIP
923export mod_strip_cmd
924
Bertrand Jacquinbeb50df2014-08-27 20:31:56 +0930925# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
926# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
927# or CONFIG_MODULE_COMPRESS_XZ.
928
929mod_compress_cmd = true
930ifdef CONFIG_MODULE_COMPRESS
931 ifdef CONFIG_MODULE_COMPRESS_GZIP
Jason A. Donenfeld3d1450d2015-07-07 20:26:07 +0200932 mod_compress_cmd = gzip -n -f
Bertrand Jacquinbeb50df2014-08-27 20:31:56 +0930933 endif # CONFIG_MODULE_COMPRESS_GZIP
934 ifdef CONFIG_MODULE_COMPRESS_XZ
Jason A. Donenfeld3d1450d2015-07-07 20:26:07 +0200935 mod_compress_cmd = xz -f
Bertrand Jacquinbeb50df2014-08-27 20:31:56 +0930936 endif # CONFIG_MODULE_COMPRESS_XZ
937endif # CONFIG_MODULE_COMPRESS
938export mod_compress_cmd
939
P J P1bf49dd2013-11-12 15:11:44 -0800940# Select initial ramdisk compression format, default is gzip(1).
941# This shall be used by the dracut(8) tool while creating an initramfs image.
942#
Jan Beulich7ac18152013-12-18 17:08:57 -0800943INITRD_COMPRESS-y := gzip
944INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
945INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
946INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
947INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
948INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
Linus Torvaldsb7000ad2013-12-20 16:52:45 -0800949# do not export INITRD_COMPRESS, since we didn't actually
950# choose a sane default compression above.
951# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952
Michal Marekd9d8d7e2013-01-25 13:41:31 +1030953ifdef CONFIG_MODULE_SIG_ALL
David Woodhouse3ee550f2015-08-14 16:17:16 +0100954$(eval $(call config_filename,MODULE_SIG_KEY))
955
956mod_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 +1030957else
958mod_sign_cmd = true
959endif
960export mod_sign_cmd
961
962
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963ifeq ($(KBUILD_EXTMOD),)
David Howellscfc411e2015-08-14 15:20:41 +0100964core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965
966vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
967 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
Feng Wu37d9fe42015-09-22 16:47:29 +0800968 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969
970vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
Feng Wu37d9fe42015-09-22 16:47:29 +0800971 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972
973init-y := $(patsubst %/, %/built-in.o, $(init-y))
974core-y := $(patsubst %/, %/built-in.o, $(core-y))
975drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
976net-y := $(patsubst %/, %/built-in.o, $(net-y))
977libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
978libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
979libs-y := $(libs-y1) $(libs-y2)
Feng Wu37d9fe42015-09-22 16:47:29 +0800980virt-y := $(patsubst %/, %/built-in.o, $(virt-y))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200982# Externally visible symbols (used by link-vmlinux.sh)
Sam Ravnborg95698572012-05-05 10:18:40 +0200983export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
Feng Wu37d9fe42015-09-22 16:47:29 +0800984export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
Sam Ravnborg95698572012-05-05 10:18:40 +0200985export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200986export LDFLAGS_vmlinux
Michal Marek6615d6c2013-04-12 14:12:50 +0200987# used by scripts/pacmage/Makefile
Feng Wu37d9fe42015-09-22 16:47:29 +0800988export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +0200990vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991
Nicolas Pitre2441e782016-04-22 15:25:00 -0400992# Include targets which we want to execute sequentially if the rest of the
993# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
994# evaluated more than once.
995PHONY += vmlinux_prereq
996vmlinux_prereq: $(vmlinux-deps) FORCE
David Woodhouse0f836e5f2006-10-11 01:21:43 -0700997ifdef CONFIG_HEADERS_CHECK
David Woodhouse0e7af8d042006-10-13 16:04:23 +0100998 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
David Woodhouse0f836e5f2006-10-11 01:21:43 -0700999endif
Jan Kiszka3ee7b3f2015-02-17 13:46:36 -08001000ifdef CONFIG_GDB_SCRIPTS
1001 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
1002endif
Nicolas Pitre2441e782016-04-22 15:25:00 -04001003ifdef CONFIG_TRIM_UNUSED_KSYMS
Nicolas Ferreba79d402016-04-25 17:55:08 +02001004 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
Nicolas Pitre86556392016-12-02 15:11:50 -05001005 "$(MAKE) -f $(srctree)/Makefile vmlinux"
Nicolas Pitre2441e782016-04-22 15:25:00 -04001006endif
Nicolas Pitre23121ca2016-01-26 21:50:18 -05001007
1008# standalone target for easier testing
1009include/generated/autoksyms.h: FORCE
Nicolas Ferreba79d402016-04-25 17:55:08 +02001010 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
Nicolas Pitre23121ca2016-01-26 21:50:18 -05001011
Nicholas Pigginfbe6e372016-08-24 22:29:21 +10001012ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1013
1014# Final link of vmlinux with optional arch pass after final link
1015 cmd_link-vmlinux = \
1016 $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ; \
1017 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
Nicolas Pitre2441e782016-04-22 15:25:00 -04001018
Nicolas Pitreedf69472016-04-26 16:48:44 -04001019vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +02001020 +$(call if_changed,link-vmlinux)
Sam Ravnborg741f98f2007-07-17 10:54:06 +02001021
Nicolas Pitredd924782016-02-28 22:00:00 -05001022# Build samples along the rest of the kernel
1023ifdef CONFIG_SAMPLES
1024vmlinux-dirs += samples
1025endif
1026
Masahiro Yamada38385f82014-04-28 16:26:18 +09001027# The actual objects are generated when descending,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028# make sure no implicit rule kicks in
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +02001029$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030
1031# Handle descending into subdirectories listed in $(vmlinux-dirs)
1032# Preset locale variables to speed up the build process. Limit locale
1033# tweaks to this spot to avoid wrong language settings when running
1034# make menuconfig etc.
1035# Error messages still appears in the original language
1036
Paul Smith4f193362006-03-05 17:14:10 -05001037PHONY += $(vmlinux-dirs)
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001038$(vmlinux-dirs): prepare scripts
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039 $(Q)$(MAKE) $(build)=$@
1040
Michal Marek0d0e7712013-07-11 15:34:51 +02001041define filechk_kernel.release
1042 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1043endef
1044
Geert Uytterhoeven83a35e32013-06-28 11:27:31 +02001045# Store (new) KERNELRELEASE string in include/config/kernel.release
Roman Zippelf1d28fb2006-06-08 22:12:43 -07001046include/config/kernel.release: include/config/auto.conf FORCE
Michal Marek0d0e7712013-07-11 15:34:51 +02001047 $(call filechk,kernel.release)
Sam Ravnborgcb584552006-01-09 21:20:34 +01001048
1049
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050# Things we need to do before we recursively start building the kernel
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001051# or the modules are listed in "prepare".
1052# A multi level approach is used. prepareN is processed before prepareN-1.
1053# archprepare is used in arch Makefiles and when processed asm symlink,
1054# version.h and scripts_basic is processed / created.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001056# Listed in dependency order
Paul Smith4f193362006-03-05 17:14:10 -05001057PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001058
Sam Ravnborg86feeaa2005-09-09 19:28:28 +02001059# prepare3 is used to check if we are building in a separate output directory,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060# and if so do:
1061# 1) Check that make has not been executed in the kernel src $(srctree)
Roman Zippelf1d28fb2006-06-08 22:12:43 -07001062prepare3: include/config/kernel.release
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063ifneq ($(KBUILD_SRC),)
Mike Frysingerfd54f502008-11-06 03:31:35 -05001064 @$(kecho) ' Using $(srctree) as source for kernel'
Roman Zippelc955cca2006-06-08 22:12:39 -07001065 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
Michal Marek5369f552012-07-07 23:04:40 +02001066 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1067 echo >&2 " in the '$(srctree)' directory.";\
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 /bin/false; \
1069 fi;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070endif
1071
Kees Cookc965b102016-07-26 15:21:17 -07001072# prepare2 creates a makefile if using a separate output directory.
1073# From this point forward, .config has been reprocessed, so any rules
1074# that need to depend on updated CONFIG_* values can be checked here.
1075prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076
David Howellsd183e6f2012-10-02 18:01:56 +01001077prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
Sam Ravnborgf7f16b72009-10-18 00:00:43 +02001078 include/config/auto.conf
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001079 $(cmd_crmodverdir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080
H. Peter Anvin6520fe52012-05-08 21:22:24 +03001081archprepare: archheaders archscripts prepare1 scripts_basic
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001082
Emese Revfy6b90bd42016-05-24 00:09:38 +02001083prepare0: archprepare gcc-plugins
Sam Ravnborg8d36a622005-09-10 21:05:36 +02001084 $(Q)$(MAKE) $(build)=.
Sam Ravnborg86feeaa2005-09-09 19:28:28 +02001085
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086# All the preparing..
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -06001087prepare: prepare0 prepare-objtool
1088
Josh Poimboeuf3b27a0c2016-03-03 11:39:30 -06001089ifdef CONFIG_STACK_VALIDATION
Steven Rostedtc2bb9e32016-04-20 11:32:35 -04001090 has_libelf := $(call try-run,\
1091 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
Josh Poimboeuf3b27a0c2016-03-03 11:39:30 -06001092 ifeq ($(has_libelf),1)
1093 objtool_target := tools/objtool FORCE
1094 else
Jean Delvareb573d802016-06-16 10:54:20 +02001095 $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
Josh Poimboeuf3b27a0c2016-03-03 11:39:30 -06001096 SKIP_STACK_VALIDATION := 1
1097 export SKIP_STACK_VALIDATION
1098 endif
1099endif
1100
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -06001101PHONY += prepare-objtool
Josh Poimboeuf3b27a0c2016-03-03 11:39:30 -06001102prepare-objtool: $(objtool_target)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103
Kees Cookc965b102016-07-26 15:21:17 -07001104# Check for CONFIG flags that require compiler support. Abort the build
1105# after .config has been processed, but before the kernel build starts.
1106#
1107# For security-sensitive CONFIG options, we don't want to fallback and/or
1108# silently change which compiler flags will be used, since that leads to
1109# producing kernels with different security feature characteristics
1110# depending on the compiler used. (For example, "But I selected
1111# CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1112PHONY += prepare-compiler-check
1113prepare-compiler-check: FORCE
1114# Make sure compiler supports requested stack protector flag.
1115ifdef stackp-name
1116 ifeq ($(call cc-option, $(stackp-flag)),)
1117 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1118 $(stackp-flag) not supported by compiler >&2 && exit 1
1119 endif
1120endif
1121# Make sure compiler does not have buggy stack-protector support.
1122ifdef stackp-check
1123 ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1124 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1125 $(stackp-flag) available but compiler is broken >&2 && exit 1
1126 endif
1127endif
1128 @:
1129
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130# Generate some files
1131# ---------------------------------------------------------------------------
1132
1133# KERNELRELEASE can change from a few different places, meaning version.h
1134# needs to be updated, so this check is forced on all builds
1135
1136uts_len := 64
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001137define filechk_utsrelease.h
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001139 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1140 exit 1; \
1141 fi; \
1142 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143endef
1144
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001145define filechk_version.h
Jesper Juhl450c6072012-02-16 22:49:15 +01001146 (echo \#define LINUX_VERSION_CODE $(shell \
1147 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001148 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1149endef
1150
David Howellsd183e6f2012-10-02 18:01:56 +01001151$(version_h): $(srctree)/Makefile FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152 $(call filechk,version.h)
Michal Marek223c24a2014-11-27 16:13:17 +01001153 $(Q)rm -f $(old_version_h)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154
Sam Ravnborg273b2812009-10-18 00:52:28 +02001155include/generated/utsrelease.h: include/config/kernel.release FORCE
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001156 $(call filechk,utsrelease.h)
1157
Vegard Nossum179efcb2008-12-16 12:33:43 +01001158PHONY += headerdep
1159headerdep:
Peter Foley9663d982011-04-26 17:17:11 -04001160 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1161 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
Vegard Nossum179efcb2008-12-16 12:33:43 +01001162
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163# ---------------------------------------------------------------------------
David Woodhouse88ecf812008-05-29 11:01:51 +03001164# Firmware install
1165INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1166export INSTALL_FW_PATH
1167
1168PHONY += firmware_install
Masahiro Yamada2e8d6962016-03-13 09:13:55 +09001169firmware_install:
David Woodhouse88ecf812008-05-29 11:01:51 +03001170 @mkdir -p $(objtree)/firmware
1171 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1172
1173# ---------------------------------------------------------------------------
David Woodhouse8d730cf2006-06-18 11:58:39 +01001174# Kernel headers
David Woodhouse8d730cf2006-06-18 11:58:39 +01001175
Sam Ravnborge6883b12008-06-05 16:43:46 +02001176#Default location for installed headers
1177export INSTALL_HDR_PATH = $(objtree)/usr
1178
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001179# If we do an all arch process set dst to asm-$(hdr-arch)
1180hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
Sam Ravnborge6883b12008-06-05 16:43:46 +02001181
H. Peter Anvin052ad272011-11-17 13:17:35 -08001182PHONY += archheaders
1183archheaders:
1184
H. Peter Anvin6520fe52012-05-08 21:22:24 +03001185PHONY += archscripts
1186archscripts:
1187
Sam Ravnborge6883b12008-06-05 16:43:46 +02001188PHONY += __headers
Masahiro Yamada2e8d6962016-03-13 09:13:55 +09001189__headers: $(version_h) scripts_basic asm-generic archheaders archscripts
Mike Waychisone1b702c2011-03-14 23:34:25 -07001190 $(Q)$(MAKE) $(build)=scripts build_unifdef
David Woodhouse6d716272006-09-24 22:16:03 +01001191
1192PHONY += headers_install_all
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001193headers_install_all:
1194 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
David Woodhouse6d716272006-09-24 22:16:03 +01001195
David Woodhouse8d730cf2006-06-18 11:58:39 +01001196PHONY += headers_install
Sam Ravnborge6883b12008-06-05 16:43:46 +02001197headers_install: __headers
David Howells10b63952012-10-02 18:01:57 +01001198 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1199 $(error Headers not exportable for the $(SRCARCH) architecture))
1200 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1201 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
David Woodhouse8d730cf2006-06-18 11:58:39 +01001202
Mike Frysinger1f857122007-02-14 00:33:02 -08001203PHONY += headers_check_all
1204headers_check_all: headers_install_all
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001205 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
Mike Frysinger1f857122007-02-14 00:33:02 -08001206
David Woodhouse68475352006-06-18 12:02:10 +01001207PHONY += headers_check
1208headers_check: headers_install
David Howells10b63952012-10-02 18:01:57 +01001209 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1210 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
David Woodhouse68475352006-06-18 12:02:10 +01001211
David Woodhouse8d730cf2006-06-18 11:58:39 +01001212# ---------------------------------------------------------------------------
Shuah Khan5a5da782014-08-07 13:07:46 -06001213# Kernel selftest
1214
1215PHONY += kselftest
1216kselftest:
1217 $(Q)$(MAKE) -C tools/testing/selftests run_tests
1218
Wang Longdcb825a2015-10-08 02:41:18 +00001219kselftest-clean:
1220 $(Q)$(MAKE) -C tools/testing/selftests clean
1221
Bamvor Jian Zhang3d6dee72016-01-08 15:27:34 +08001222PHONY += kselftest-merge
1223kselftest-merge:
1224 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1225 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1226 -m $(objtree)/.config \
1227 $(srctree)/tools/testing/selftests/*/config
1228 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1229
Shuah Khan5a5da782014-08-07 13:07:46 -06001230# ---------------------------------------------------------------------------
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231# Modules
1232
1233ifdef CONFIG_MODULES
1234
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001235# By default, build modules as well
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236
Michal Marek73d13932010-03-10 12:28:58 +01001237all: modules
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +09001239# Build modules
Tejun Heo551559e2007-12-07 21:04:30 +09001240#
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +09001241# A module can be listed more than once in obj-m resulting in
1242# duplicate lines in modules.order files. Those are removed
1243# using awk while concatenating to the final file.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244
Paul Smith4f193362006-03-05 17:14:10 -05001245PHONY += modules
Michal Marek2da30e72010-06-07 22:22:12 +02001246modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
Tejun Heo551559e2007-12-07 21:04:30 +09001247 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
Mike Frysingerfd54f502008-11-06 03:31:35 -05001248 @$(kecho) ' Building modules, stage 2.';
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001249 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
David Woodhouse44463f72008-07-25 14:17:19 -04001250 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
Linus Torvalds1da177e2005-04-16 15:20:36 -07001251
Michal Mareka6c36632010-03-08 10:07:12 +01001252modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1253 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1254
Michal Marek73d13932010-03-10 12:28:58 +01001255%/modules.builtin: include/config/auto.conf
Michal Mareka6c36632010-03-08 10:07:12 +01001256 $(Q)$(MAKE) $(modbuiltin)=$*
1257
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258
1259# Target to prepare building external modules
Paul Smith4f193362006-03-05 17:14:10 -05001260PHONY += modules_prepare
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001261modules_prepare: prepare scripts
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262
1263# Target to install modules
Paul Smith4f193362006-03-05 17:14:10 -05001264PHONY += modules_install
Linus Torvalds1da177e2005-04-16 15:20:36 -07001265modules_install: _modinst_ _modinst_post
1266
Paul Smith4f193362006-03-05 17:14:10 -05001267PHONY += _modinst_
Michal Marek2da30e72010-06-07 22:22:12 +02001268_modinst_:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001269 @rm -rf $(MODLIB)/kernel
1270 @rm -f $(MODLIB)/source
1271 @mkdir -p $(MODLIB)/kernel
Michal Marek890676c2014-04-25 17:36:14 +02001272 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1274 rm -f $(MODLIB)/build ; \
Michal Marek7e1c0472014-04-25 17:29:45 +02001275 ln -s $(CURDIR) $(MODLIB)/build ; \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276 fi
Tejun Heo551559e2007-12-07 21:04:30 +09001277 @cp -f $(objtree)/modules.order $(MODLIB)/
Michal Marekbc081dd2009-12-07 16:38:33 +01001278 @cp -f $(objtree)/modules.builtin $(MODLIB)/
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001279 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
Linus Torvalds1da177e2005-04-16 15:20:36 -07001280
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001281# This depmod is only for convenience to give the initial
Linus Torvalds1da177e2005-04-16 15:20:36 -07001282# boot a modules.dep even before / is mounted read-write. However the
1283# boot script depmod is the master version.
Paul Smith4f193362006-03-05 17:14:10 -05001284PHONY += _modinst_post
Linus Torvalds6d128e12013-07-10 19:02:51 -07001285_modinst_post: _modinst_
David Woodhouse88ecf812008-05-29 11:01:51 +03001286 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001287 $(call cmd,depmod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288
Josh Boyerd890f512012-11-05 09:09:24 +10301289ifeq ($(CONFIG_MODULE_SIG), y)
1290PHONY += modules_sign
1291modules_sign:
1292 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1293endif
1294
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295else # CONFIG_MODULES
1296
1297# Modules not configured
1298# ---------------------------------------------------------------------------
1299
Masahiro Yamada612e47c2016-03-13 09:39:22 +09001300PHONY += modules modules_install
1301modules modules_install:
Michal Marek5369f552012-07-07 23:04:40 +02001302 @echo >&2
1303 @echo >&2 "The present kernel configuration has modules disabled."
1304 @echo >&2 "Type 'make config' and enable loadable module support."
1305 @echo >&2 "Then build a kernel with module support enabled."
1306 @echo >&2
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307 @exit 1
1308
1309endif # CONFIG_MODULES
1310
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311###
1312# Cleaning is done on three levels.
1313# make clean Delete most generated files
1314# Leave enough to build external modules
1315# make mrproper Delete the current configuration, and all generated files
1316# make distclean Remove editor backup files, patch leftover files and the like
1317
1318# Directories & files removed with 'make clean'
1319CLEAN_DIRS += $(MODVERDIR)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001320
1321# Directories & files removed with 'make mrproper'
Sam Ravnborgd8ecc5c2011-04-27 22:29:49 +02001322MRPROPER_DIRS += include/config usr/include include/generated \
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +09001323 arch/*/include/generated .tmp_objdiff
Masahiro Yamadac22bd32c2015-01-08 17:29:38 +09001324MRPROPER_FILES += .config .config.old .version .old_version \
Rusty Russelld5b71932012-10-02 14:35:24 +09301325 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
David Woodhousefb117942015-07-20 21:16:30 +01001326 signing_key.pem signing_key.priv signing_key.x509 \
1327 x509.genkey extra_certificates signing_key.x509.keyid \
Jan Kiszka3ee7b3f2015-02-17 13:46:36 -08001328 signing_key.x509.signer vmlinux-gdb.py
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329
1330# clean - Delete most, but leave enough to build external modules
1331#
1332clean: rm-dirs := $(CLEAN_DIRS)
1333clean: rm-files := $(CLEAN_FILES)
Gerard Snitselaarfb68d4b2012-02-04 02:55:59 -07001334clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335
Pawel Mollbd1ee802012-10-29 11:23:02 +00001336PHONY += $(clean-dirs) clean archclean vmlinuxclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337$(clean-dirs):
1338 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1339
Pawel Mollbd1ee802012-10-29 11:23:02 +00001340vmlinuxclean:
1341 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
Nicholas Pigginfbe6e372016-08-24 22:29:21 +10001342 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
Pawel Mollbd1ee802012-10-29 11:23:02 +00001343
1344clean: archclean vmlinuxclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345
1346# mrproper - Delete all generated files, including .config
1347#
1348mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1349mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1350mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1351
Paul Smith4f193362006-03-05 17:14:10 -05001352PHONY += $(mrproper-dirs) mrproper archmrproper
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353$(mrproper-dirs):
1354 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1355
1356mrproper: clean archmrproper $(mrproper-dirs)
1357 $(call cmd,rmdirs)
1358 $(call cmd,rmfiles)
1359
1360# distclean
1361#
Paul Smith4f193362006-03-05 17:14:10 -05001362PHONY += distclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363
1364distclean: mrproper
1365 @find $(srctree) $(RCS_FIND_IGNORE) \
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001366 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
Masahiro Yamadaa03fcb502014-03-28 16:36:12 +09001368 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 -type f -print | xargs rm -f
1370
1371
1372# Packaging of the kernel to various formats
1373# ---------------------------------------------------------------------------
1374# rpm target kept for backward compatibility
Michal Marekc79624c2014-07-04 22:53:52 +02001375package-dir := scripts/package
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376
Arnaldo Carvalho de Melobafb6742010-06-07 07:44:25 -03001377%src-pkg: FORCE
1378 $(Q)$(MAKE) $(build)=$(package-dir) $@
Zach Brown031ecc62006-06-08 22:12:37 -07001379%pkg: include/config/kernel.release FORCE
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001380 $(Q)$(MAKE) $(build)=$(package-dir) $@
Zach Brown031ecc62006-06-08 22:12:37 -07001381rpm: include/config/kernel.release FORCE
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001382 $(Q)$(MAKE) $(build)=$(package-dir) $@
Linus Torvalds1da177e2005-04-16 15:20:36 -07001383
1384
1385# Brief documentation of the typical targets used
1386# ---------------------------------------------------------------------------
1387
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001388boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
Konstantin Khlebnikova1e7b7b2014-10-28 17:18:20 +04001389boards := $(sort $(notdir $(boards)))
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001390board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1391board-dirs := $(sort $(notdir $(board-dirs:/=)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001392
Masahiro Yamadafe69b422016-03-13 09:39:55 +09001393PHONY += help
Linus Torvalds1da177e2005-04-16 15:20:36 -07001394help:
1395 @echo 'Cleaning targets:'
Samuel Tardieu5ea084e2006-12-12 19:09:40 +01001396 @echo ' clean - Remove most generated files but keep the config and'
Jesper Juhl5cc8d242006-09-24 14:01:08 +02001397 @echo ' enough build support to build external modules'
Samuel Tardieu5ea084e2006-12-12 19:09:40 +01001398 @echo ' mrproper - Remove all generated files + config + various backup files'
Jesper Juhl5cc8d242006-09-24 14:01:08 +02001399 @echo ' distclean - mrproper + remove editor backup and patch files'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400 @echo ''
1401 @echo 'Configuration targets:'
1402 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1403 @echo ''
1404 @echo 'Other generic targets:'
1405 @echo ' all - Build all targets marked with [*]'
1406 @echo '* vmlinux - Build the bare kernel'
1407 @echo '* modules - Build all modules'
Bodo Eggert9cc5d742005-11-23 20:11:34 +01001408 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
David Woodhouse88ecf812008-05-29 11:01:51 +03001409 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1410 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001411 @echo ' dir/ - Build all files in dir and below'
Wang YanQing40ab87a2015-12-11 00:35:19 +08001412 @echo ' dir/file.[ois] - Build specified target only'
Vinícius Tinti85ab13f2017-04-24 13:04:58 -07001413 @echo ' dir/file.ll - Build the LLVM assembly file'
1414 @echo ' (requires compiler support for LLVM assembly generation)'
Joe Perches62718972010-01-13 09:31:44 -08001415 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1416 @echo ' (requires a recent binutils and recent build (System.map))'
Sam Ravnborg155ad602005-07-07 17:56:08 -07001417 @echo ' dir/file.ko - Build module including final link'
Robert P. J. Dayc4d5ee62009-04-24 12:35:23 -04001418 @echo ' modules_prepare - Set up for building external modules'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419 @echo ' tags/TAGS - Generate tags file for editors'
1420 @echo ' cscope - Generate cscope index'
Jianbin Kangf4ed1002011-01-14 20:07:05 +08001421 @echo ' gtags - Generate GNU GLOBAL index'
Michal Marek3f1d9a62014-07-11 15:57:24 +02001422 @echo ' kernelrelease - Output the release version string (use with make -s)'
1423 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1424 @echo ' image_name - Output the image name (use with make -s)'
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001425 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
Geert Uytterhoeven59df3232007-01-29 13:47:01 +01001426 echo ' (default: $(INSTALL_HDR_PATH))'; \
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001427 echo ''
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428 @echo 'Static analysers'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429 @echo ' checkstack - Generate a list of stack hogs'
1430 @echo ' namespacecheck - Name space analysis on compiled kernel'
Sam Ravnborgaa025e72007-11-14 21:34:55 +01001431 @echo ' versioncheck - Sanity check on version.h usage'
Randy Dunlapec2d9872007-11-04 12:01:55 -08001432 @echo ' includecheck - Check for duplicate included header files'
Adrian Bunk295ac052007-08-24 23:04:56 +02001433 @echo ' export_report - List the usages of all exported symbols'
Vegard Nossum179efcb2008-12-16 12:33:43 +01001434 @echo ' headers_check - Sanity check on exported headers'
Nicolas Palix74425ee2010-06-06 17:15:01 +02001435 @echo ' headerdep - Detect inclusion cycles in headers'
1436 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1437 @echo ''
Shuah Khan5a5da782014-08-07 13:07:46 -06001438 @echo 'Kernel selftest'
1439 @echo ' kselftest - Build and run kernel selftest (run as root)'
1440 @echo ' Build, install, and boot kernel before'
1441 @echo ' running kselftest on it'
Wang Longdcb825a2015-10-08 02:41:18 +00001442 @echo ' kselftest-clean - Remove all generated kselftest files'
Bamvor Jian Zhang3d6dee72016-01-08 15:27:34 +08001443 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existed'
1444 @echo ' .config.'
Shuah Khan5a5da782014-08-07 13:07:46 -06001445 @echo ''
Linus Torvalds1da177e2005-04-16 15:20:36 -07001446 @echo 'Kernel packaging:'
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001447 @$(MAKE) $(build)=$(package-dir) help
Linus Torvalds1da177e2005-04-16 15:20:36 -07001448 @echo ''
1449 @echo 'Documentation targets:'
Jani Nikulaebc88ef2016-06-22 15:41:48 +03001450 @$(MAKE) -f $(srctree)/Documentation/Makefile.sphinx dochelp
1451 @echo ''
Linus Torvalds1da177e2005-04-16 15:20:36 -07001452 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1453 @echo ''
Andres Salomon01dee182008-04-25 22:34:58 -04001454 @echo 'Architecture specific targets ($(SRCARCH)):'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455 @$(if $(archhelp),$(archhelp),\
Andres Salomon01dee182008-04-25 22:34:58 -04001456 echo ' No architecture specific help defined for $(SRCARCH)')
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457 @echo ''
1458 @$(if $(boards), \
1459 $(foreach b, $(boards), \
1460 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1461 echo '')
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001462 @$(if $(board-dirs), \
1463 $(foreach b, $(board-dirs), \
1464 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1465 printf " %-16s - Show all of the above\\n" help-boards; \
1466 echo '')
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467
1468 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
Sam Ravnborg45d506b2006-08-08 21:35:14 +02001469 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001470 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
Dustin Kirkland701842e2006-05-23 15:57:23 -05001471 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1472 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
Ingo Molnaraf07ce32011-06-16 13:26:23 +02001473 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
Sam Ravnborg28bc20d2011-04-27 22:15:27 +02001474 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1475 @echo ' 1: warnings which may be relevant and do not occur too often'
1476 @echo ' 2: warnings which occur quite often but may still be relevant'
1477 @echo ' 3: more obscure warnings, can most likely be ignored'
Michal Mareka6de5532011-04-29 14:45:31 +02001478 @echo ' Multiple levels can be combined with W=12 or W=123'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001479 @echo ''
1480 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1481 @echo 'For further info see the ./README file'
1482
1483
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001484help-board-dirs := $(addprefix help-,$(board-dirs))
1485
1486help-boards: $(help-board-dirs)
1487
Michal Marekfbae4d52014-11-28 13:31:43 +01001488boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001489
1490$(help-board-dirs): help-%:
1491 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1492 @$(if $(boards-per-dir), \
1493 $(foreach b, $(boards-per-dir), \
1494 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1495 echo '')
1496
1497
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498# Documentation targets
1499# ---------------------------------------------------------------------------
Mauro Carvalho Chehabd5651272016-08-18 11:53:39 -03001500DOC_TARGETS := xmldocs sgmldocs psdocs latexdocs pdfdocs htmldocs mandocs installmandocs epubdocs cleandocs
Jani Nikula22cba312016-05-19 15:14:05 +03001501PHONY += $(DOC_TARGETS)
1502$(DOC_TARGETS): scripts_basic FORCE
Ben Hutchingsb479bfd2015-09-28 01:09:52 +01001503 $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
Jani Nikula22cba312016-05-19 15:14:05 +03001504 $(Q)$(MAKE) $(build)=Documentation -f $(srctree)/Documentation/Makefile.sphinx $@
Linus Torvalds1da177e2005-04-16 15:20:36 -07001505 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1506
1507else # KBUILD_EXTMOD
1508
1509###
1510# External module support.
1511# When building external modules the kernel used as basis is considered
1512# read-only, and no consistency checks are made and the make
1513# system is not used on the basis kernel. If updates are required
1514# in the basis kernel ordinary make commands (without M=...) must
1515# be used.
1516#
1517# The following are the only valid targets when building external
1518# modules.
1519# make M=dir clean Delete all automatically generated files
1520# make M=dir modules Make all modules in specified dir
1521# make M=dir Same as 'make M=dir modules'
1522# make M=dir modules_install
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001523# Install the modules built in the module directory
Linus Torvalds1da177e2005-04-16 15:20:36 -07001524# Assumes install directory is already created
1525
1526# We are always building modules
1527KBUILD_MODULES := 1
Linus Torvalds1da177e2005-04-16 15:20:36 -07001528
Paul Smith4f193362006-03-05 17:14:10 -05001529PHONY += $(objtree)/Module.symvers
Linus Torvalds1da177e2005-04-16 15:20:36 -07001530$(objtree)/Module.symvers:
1531 @test -e $(objtree)/Module.symvers || ( \
1532 echo; \
1533 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1534 echo " is missing; modules will have no dependencies and modversions."; \
1535 echo )
1536
1537module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
Paul Smith4f193362006-03-05 17:14:10 -05001538PHONY += $(module-dirs) modules
Masahiro Yamadab1335cd2018-11-22 08:11:54 +09001539$(module-dirs): prepare $(objtree)/Module.symvers
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1541
1542modules: $(module-dirs)
Mike Frysingerfd54f502008-11-06 03:31:35 -05001543 @$(kecho) ' Building modules, stage 2.';
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001544 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
Linus Torvalds1da177e2005-04-16 15:20:36 -07001545
Paul Smith4f193362006-03-05 17:14:10 -05001546PHONY += modules_install
Sam Ravnborga67dc212006-01-28 23:51:57 +01001547modules_install: _emodinst_ _emodinst_post
Adrian Bunke6304662006-02-14 15:58:15 +01001548
Paul Smith4f193362006-03-05 17:14:10 -05001549install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1550PHONY += _emodinst_
Sam Ravnborga67dc212006-01-28 23:51:57 +01001551_emodinst_:
Sam Ravnborga67dc212006-01-28 23:51:57 +01001552 $(Q)mkdir -p $(MODLIB)/$(install-dir)
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001553 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
Linus Torvalds1da177e2005-04-16 15:20:36 -07001554
Paul Smith4f193362006-03-05 17:14:10 -05001555PHONY += _emodinst_post
Sam Ravnborga67dc212006-01-28 23:51:57 +01001556_emodinst_post: _emodinst_
1557 $(call cmd,depmod)
1558
Linus Torvalds1da177e2005-04-16 15:20:36 -07001559clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1560
Paul Smith4f193362006-03-05 17:14:10 -05001561PHONY += $(clean-dirs) clean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001562$(clean-dirs):
1563 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1564
1565clean: rm-dirs := $(MODVERDIR)
Michal Marek88d7be02010-09-06 12:00:08 +02001566clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
Linus Torvalds1da177e2005-04-16 15:20:36 -07001567
Masahiro Yamadafe69b422016-03-13 09:39:55 +09001568PHONY += help
Linus Torvalds1da177e2005-04-16 15:20:36 -07001569help:
1570 @echo ' Building external modules.'
1571 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1572 @echo ''
1573 @echo ' modules - default target, build the module(s)'
1574 @echo ' modules_install - install the module'
1575 @echo ' clean - remove generated files in module directory only'
1576 @echo ''
Sam Ravnborg06300b22006-01-25 07:13:18 +01001577
1578# Dummies...
Paul Smith4f193362006-03-05 17:14:10 -05001579PHONY += prepare scripts
Masahiro Yamadab1335cd2018-11-22 08:11:54 +09001580prepare:
1581 $(cmd_crmodverdir)
Sam Ravnborg06300b22006-01-25 07:13:18 +01001582scripts: ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001583endif # KBUILD_EXTMOD
1584
Michal Marek88d7be02010-09-06 12:00:08 +02001585clean: $(clean-dirs)
1586 $(call cmd,rmdirs)
1587 $(call cmd,rmfiles)
Kevin Cernekee43f67c92011-05-10 15:47:16 -07001588 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
Michal Marek88d7be02010-09-06 12:00:08 +02001589 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
David Howellsaddbcdb2012-09-26 10:09:50 +01001590 -o -name '*.ko.*' \
Andi Kleen866ced92014-07-30 20:50:18 +02001591 -o -name '*.dwo' \
Rasmus Villemoesd523b252015-08-20 11:53:29 +02001592 -o -name '*.su' \
Michal Marek88d7be02010-09-06 12:00:08 +02001593 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1594 -o -name '*.symtypes' -o -name 'modules.order' \
1595 -o -name modules.builtin -o -name '.tmp_*.o.*' \
Emese Revfy6b90bd42016-05-24 00:09:38 +02001596 -o -name '*.c.[012]*.*' \
Vinícius Tinti85ab13f2017-04-24 13:04:58 -07001597 -o -name '*.ll' \
Michal Marek88d7be02010-09-06 12:00:08 +02001598 -o -name '*.gcno' \) -type f -print | xargs rm -f
1599
Linus Torvalds1da177e2005-04-16 15:20:36 -07001600# Generate tags for editors
1601# ---------------------------------------------------------------------------
Sam Ravnborga680eed2008-12-03 22:24:13 +01001602quiet_cmd_tags = GEN $@
1603 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
Linus Torvalds1da177e2005-04-16 15:20:36 -07001604
Jianbin Kangf4ed1002011-01-14 20:07:05 +08001605tags TAGS cscope gtags: FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001606 $(call cmd,tags)
1607
Linus Torvalds1da177e2005-04-16 15:20:36 -07001608# Scripts to check various things for consistency
1609# ---------------------------------------------------------------------------
1610
Peter Foley279f3dd2011-04-26 17:15:01 -04001611PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1612
Linus Torvalds1da177e2005-04-16 15:20:36 -07001613includecheck:
Peter Foley436f8762011-04-26 17:18:29 -04001614 find $(srctree)/* $(RCS_FIND_IGNORE) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001615 -name '*.[hcS]' -type f -print | sort \
Geert Uytterhoeven80007432007-11-05 11:51:44 +01001616 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
Linus Torvalds1da177e2005-04-16 15:20:36 -07001617
1618versioncheck:
Peter Foley2ee2d292011-04-26 17:19:28 -04001619 find $(srctree)/* $(RCS_FIND_IGNORE) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001620 -name '*.[hcS]' -type f -print | sort \
Geert Uytterhoeven80007432007-11-05 11:51:44 +01001621 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
Linus Torvalds1da177e2005-04-16 15:20:36 -07001622
Nicolas Palix74425ee2010-06-06 17:15:01 +02001623coccicheck:
1624 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1625
Linus Torvalds1da177e2005-04-16 15:20:36 -07001626namespacecheck:
1627 $(PERL) $(srctree)/scripts/namespace.pl
1628
Adrian Bunk295ac052007-08-24 23:04:56 +02001629export_report:
1630 $(PERL) $(srctree)/scripts/export_report.pl
1631
Linus Torvalds1da177e2005-04-16 15:20:36 -07001632endif #ifeq ($(config-targets),1)
1633endif #ifeq ($(mixed-targets),1)
1634
Mike Marciniszync398ff02013-06-24 08:48:37 -04001635PHONY += checkstack kernelrelease kernelversion image_name
Jeff Dikee3ccf6e2006-09-27 01:50:37 -07001636
Jeff Dike011e3a92006-12-13 00:34:12 -08001637# UML needs a little special treatment here. It wants to use the host
1638# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1639# else wants $(ARCH), including people doing cross-builds, which means
1640# that $(SUBARCH) doesn't work here.
1641ifeq ($(ARCH), um)
1642CHECKSTACK_ARCH := $(SUBARCH)
1643else
1644CHECKSTACK_ARCH := $(ARCH)
1645endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001646checkstack:
1647 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
Jeff Dike011e3a92006-12-13 00:34:12 -08001648 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001649
Amerigo Wang7b8ea532010-08-20 05:36:06 -04001650kernelrelease:
1651 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
Amerigo Wang01ab1782010-06-28 10:45:21 +08001652
Sam Ravnborgcb584552006-01-09 21:20:34 +01001653kernelversion:
Sam Ravnborg2244cbd2006-01-16 12:12:12 +01001654 @echo $(KERNELVERSION)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001655
Mike Marciniszync398ff02013-06-24 08:48:37 -04001656image_name:
1657 @echo $(KBUILD_IMAGE)
1658
Borislav Petkovea01fa92012-04-11 18:36:18 +02001659# Clear a bunch of variables before executing the submake
1660tools/: FORCE
David Howellsbf351822012-11-05 21:02:08 +00001661 $(Q)mkdir -p $(objtree)/tools
Josh Poimboeufafdfe5f2017-01-18 22:16:55 -06001662 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
Borislav Petkovea01fa92012-04-11 18:36:18 +02001663
1664tools/%: FORCE
David Howellsbf351822012-11-05 21:02:08 +00001665 $(Q)mkdir -p $(objtree)/tools
Josh Poimboeufafdfe5f2017-01-18 22:16:55 -06001666 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
Borislav Petkovea01fa92012-04-11 18:36:18 +02001667
Sam Ravnborg06300b22006-01-25 07:13:18 +01001668# Single targets
1669# ---------------------------------------------------------------------------
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001670# Single targets are compatible with:
Robert P. J. Daye1b85132008-02-03 15:14:02 +02001671# - build with mixed source and output
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001672# - build with separate output dir 'make O=...'
1673# - external modules
1674#
1675# target-dir => where to store outputfile
1676# build-dir => directory in kernel source tree to use
Sam Ravnborg06300b22006-01-25 07:13:18 +01001677
Sam Ravnborg06300b22006-01-25 07:13:18 +01001678ifeq ($(KBUILD_EXTMOD),)
Sam Ravnborgaa360872006-04-06 08:25:31 +02001679 build-dir = $(patsubst %/,%,$(dir $@))
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001680 target-dir = $(dir $@)
Sam Ravnborg06300b22006-01-25 07:13:18 +01001681else
1682 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001683 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1684 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
Sam Ravnborg06300b22006-01-25 07:13:18 +01001685endif
1686
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001687%.s: %.c prepare scripts FORCE
1688 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1689%.i: %.c prepare scripts FORCE
1690 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1691%.o: %.c prepare scripts FORCE
1692 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1693%.lst: %.c prepare scripts FORCE
1694 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1695%.s: %.S prepare scripts FORCE
1696 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1697%.o: %.S prepare scripts FORCE
1698 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
Andreas Gruenbacher15fde672006-05-09 20:37:30 +02001699%.symtypes: %.c prepare scripts FORCE
1700 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
Vinícius Tinti85ab13f2017-04-24 13:04:58 -07001701%.ll: %.c prepare scripts FORCE
1702 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001703
1704# Modules
Sam Ravnborg31110eb2008-12-13 23:00:45 +01001705/: prepare scripts FORCE
Sam Ravnborg31110eb2008-12-13 23:00:45 +01001706 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1707 $(build)=$(build-dir)
Peter Foley8e2faea2014-09-25 11:23:58 -07001708# Make sure the latest headers are built for Documentation
Arnd Bergmannddea05f2016-07-04 16:39:35 +02001709Documentation/ samples/: headers_install
Sam Ravnborg31110eb2008-12-13 23:00:45 +01001710%/: prepare scripts FORCE
Sam Ravnborg06300b22006-01-25 07:13:18 +01001711 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001712 $(build)=$(build-dir)
1713%.ko: prepare scripts FORCE
Sam Ravnborg06300b22006-01-25 07:13:18 +01001714 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001715 $(build)=$(build-dir) $(@:.ko=.o)
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001716 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
Sam Ravnborg06300b22006-01-25 07:13:18 +01001717
Masahiro Yamada38385f82014-04-28 16:26:18 +09001718# FIXME Should go into a make.lib or something
Linus Torvalds1da177e2005-04-16 15:20:36 -07001719# ===========================================================================
1720
1721quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1722 cmd_rmdirs = rm -rf $(rm-dirs)
1723
1724quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1725 cmd_rmfiles = rm -f $(rm-files)
1726
Uwe Kleine-Königbc3c26f2008-04-21 22:53:56 +00001727# Run depmod only if we have System.map and depmod is executable
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001728quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
Michal Marek569658d2011-06-15 22:15:47 +02001729 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
Rusty Russellb92021b2013-03-15 15:04:17 +10301730 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001731
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001732# Create temporary dir for module support files
Sam Ravnborgab19f872007-10-22 11:23:07 +02001733# clean it up only when building all modules
1734cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1735 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001736
Linus Torvalds1da177e2005-04-16 15:20:36 -07001737# read all saved command lines
1738
1739targets := $(wildcard $(sort $(targets)))
1740cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1741
1742ifneq ($(cmd_files),)
1743 $(cmd_files): ; # Do not try to update included dependency files
1744 include $(cmd_files)
1745endif
1746
Linus Torvalds1da177e2005-04-16 15:20:36 -07001747endif # skip-makefile
1748
Paul Smith4f193362006-03-05 17:14:10 -05001749PHONY += FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001750FORCE:
Paul Smith4f193362006-03-05 17:14:10 -05001751
Paul Smith4f193362006-03-05 17:14:10 -05001752# Declare the contents of the .PHONY variable as phony. We keep that
Kirill Smelkovfe8d0a42009-04-09 15:34:34 +04001753# information in a variable so we can use it in if_changed and friends.
Paul Smith4f193362006-03-05 17:14:10 -05001754.PHONY: $(PHONY)