blob: 874a3a7f03f3c3547745d59597418cb56dabdd92 [file] [log] [blame]
Linus Torvaldsc517d832015-02-22 18:21:14 -08001VERSION = 4
Linus Torvalds10013542016-10-15 12:17:50 -07002PATCHLEVEL = 9
Greg Kroah-Hartman10a20902020-03-20 09:07:59 +01003SUBLEVEL = 217
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 Kaehlcke00eea2f2017-06-21 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
Behan Websterd06b1822014-09-15 17:10:34 -0700309ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
310HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
311 -Wno-missing-field-initializers
312endif
313
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200314# Decide whether to build built-in, modular, or both.
315# Normally, just do built-in.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316
317KBUILD_MODULES :=
318KBUILD_BUILTIN := 1
319
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +0900320# If we have only "make modules", don't compile built-in objects.
321# When we're building modules with modversions, we need to consider
322# the built-in objects during the descend as well, in order to
323# make sure the checksums are up to date before we record them.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324
325ifeq ($(MAKECMDGOALS),modules)
326 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
327endif
328
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +0900329# If we have "make <whatever> modules", compile modules
330# in addition to whatever we do anyway.
331# Just "make" or "make all" shall build modules as well
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332
333ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
334 KBUILD_MODULES := 1
335endif
336
337ifeq ($(MAKECMDGOALS),)
338 KBUILD_MODULES := 1
339endif
340
Sam Ravnborge579d352005-07-27 08:10:10 +0200341export KBUILD_MODULES KBUILD_BUILTIN
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
343
Sam Ravnborg1cacc9a2007-12-06 22:20:11 +0100344# We need some generic definitions (do not try to remake the file).
Masahiro Yamadaa436bb72015-03-27 20:43:36 +0900345scripts/Kbuild.include: ;
346include scripts/Kbuild.include
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347
348# Make variables (CC, etc...)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349AS = $(CROSS_COMPILE)as
350LD = $(CROSS_COMPILE)ld
Channagoud Kadabi1a82c2b2016-07-01 12:28:20 -0700351REAL_CC = $(CROSS_COMPILE)gcc
Sami Tolvanen475bdd72017-11-28 08:48:49 -0800352LDGOLD = $(CROSS_COMPILE)ld.gold
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353CPP = $(CC) -E
354AR = $(CROSS_COMPILE)ar
355NM = $(CROSS_COMPILE)nm
356STRIP = $(CROSS_COMPILE)strip
357OBJCOPY = $(CROSS_COMPILE)objcopy
358OBJDUMP = $(CROSS_COMPILE)objdump
359AWK = awk
360GENKSYMS = scripts/genksyms/genksyms
Sam Ravnborgcaa27b62009-07-20 21:37:11 +0200361INSTALLKERNEL := installkernel
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362DEPMOD = /sbin/depmod
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363PERL = perl
Masahiro Yamada011bf122014-07-18 13:40:11 +0900364PYTHON = python
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365CHECK = sparse
366
Channagoud Kadabi1a82c2b2016-07-01 12:28:20 -0700367# Use the wrapper for the compiler. This wrapper scans for new
368# warnings and causes the build to stop upon encountering them
Mukesh Ojha844f56e2018-10-12 13:21:32 +0530369CC = $(PYTHON) $(srctree)/scripts/gcc-wrapper.py $(REAL_CC)
Channagoud Kadabi1a82c2b2016-07-01 12:28:20 -0700370
Hannes Eder80a7d1d92008-12-27 22:38:44 +0100371CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
372 -Wbitwise -Wno-return-void $(CF)
Michal Marekb36fad62016-06-07 11:57:02 +0200373NOSTDINC_FLAGS =
Sam Ravnborg65881692010-07-28 17:33:09 +0200374CFLAGS_MODULE =
375AFLAGS_MODULE =
376LDFLAGS_MODULE =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377CFLAGS_KERNEL =
378AFLAGS_KERNEL =
Michal Marekb36fad62016-06-07 11:57:02 +0200379LDFLAGS_vmlinux =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380
David Howellsabbf1592012-10-02 18:01:26 +0100381# Use USERINCLUDE when you must reference the UAPI directories only.
382USERINCLUDE := \
383 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
Arnd Bergmann3308b282016-06-15 17:45:45 +0200384 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
David Howellsabbf1592012-10-02 18:01:26 +0100385 -I$(srctree)/include/uapi \
Arnd Bergmann3308b282016-06-15 17:45:45 +0200386 -I$(objtree)/include/generated/uapi \
David Howellsabbf1592012-10-02 18:01:26 +0100387 -include $(srctree)/include/linux/kconfig.h
388
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389# Use LINUXINCLUDE when you must reference the include/ directory.
390# Needed to be compatible with the O= option
David Howellsabbf1592012-10-02 18:01:26 +0100391LINUXINCLUDE := \
392 -I$(srctree)/arch/$(hdr-arch)/include \
Arnd Bergmann3308b282016-06-15 17:45:45 +0200393 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
394 -I$(objtree)/arch/$(hdr-arch)/include/generated \
David Howellsabbf1592012-10-02 18:01:26 +0100395 $(if $(KBUILD_SRC), -I$(srctree)/include) \
Arnd Bergmann3308b282016-06-15 17:45:45 +0200396 -I$(objtree)/include
Arnd Bergmanndc33db72016-06-15 17:45:44 +0200397
398LINUXINCLUDE += $(filter-out $(LINUXINCLUDE),$(USERINCLUDE))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399
Masahiro Yamada97c66872017-10-12 18:22:25 +0900400KBUILD_AFLAGS := -D__ASSEMBLY__
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200401KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
Arnd Bergmann86e51432017-07-26 15:36:23 +0200402 -fno-strict-aliasing -fno-common -fshort-wchar \
Floris Kraaka8735822009-06-15 08:54:02 +0300403 -Werror-implicit-function-declaration \
Kirill A. Shutemov51b97e32014-10-20 12:23:12 +0300404 -Wno-format-security \
Masahiro Yamada97c66872017-10-12 18:22:25 +0900405 -std=gnu89
406KBUILD_CPPFLAGS := -D__KERNEL__
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200407KBUILD_AFLAGS_KERNEL :=
408KBUILD_CFLAGS_KERNEL :=
Sam Ravnborg65881692010-07-28 17:33:09 +0200409KBUILD_AFLAGS_MODULE := -DMODULE
410KBUILD_CFLAGS_MODULE := -DMODULE
411KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
Masahiro Yamada97c66872017-10-12 18:22:25 +0900412GCC_PLUGINS_CFLAGS :=
Masahiro Yamada757ee022019-07-29 18:15:17 +0900413CLANG_FLAGS :=
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414
Roman Zippelf1d28fb2006-06-08 22:12:43 -0700415# Read KERNELRELEASE from include/config/kernel.release (if it exists)
416KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
Michal Marekcacd54e2011-05-30 13:36:07 +0200417KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
Sam Ravnborgcb584552006-01-09 21:20:34 +0100418
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200419export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
Sam Ravnborg80ef88d2007-11-17 15:37:31 +0100420export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
Sam Ravnborgcaa27b62009-07-20 21:37:11 +0200421export CPP AR NM STRIP OBJCOPY OBJDUMP
Masahiro Yamada011bf122014-07-18 13:40:11 +0900422export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200423export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424
Sam Ravnborg06c50402007-10-15 22:17:25 +0200425export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
Andrey Konovalov76b6f302018-02-06 15:36:00 -0800426export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
427export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
Sam Ravnborg222d3942007-10-15 21:59:31 +0200428export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
Sam Ravnborg65881692010-07-28 17:33:09 +0200429export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200430export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
Michal Marek40df7592011-04-20 13:45:30 +0200431export KBUILD_ARFLAGS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432
433# When compiling out-of-tree modules, put MODVERDIR in the module
434# tree rather than in the kernel tree. The kernel tree might
435# even be read-only.
436export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
437
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438# Files to ignore in find ... statements
439
Prarit Bhargavaae63b2d2014-02-06 07:51:42 -0500440export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
441 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
442 -prune -o
Jesper Juhl450c6072012-02-16 22:49:15 +0100443export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
444 --exclude CVS --exclude .pc --exclude .hg --exclude .git
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445
446# ===========================================================================
447# Rules shared between *config targets and build targets
448
449# Basic helpers built in scripts/
Paul Smith4f193362006-03-05 17:14:10 -0500450PHONY += scripts_basic
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451scripts_basic:
452 $(Q)$(MAKE) $(build)=scripts/basic
Steven Rostedt638adb02009-11-17 10:48:25 -0500453 $(Q)rm -f .tmp_quiet_recordmcount
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454
Jan Beulichcd05e6b2005-09-06 11:47:04 +0200455# To avoid any implicit rule to kick in, define an empty command.
456scripts/basic/%: scripts_basic ;
457
Paul Smith4f193362006-03-05 17:14:10 -0500458PHONY += outputmakefile
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200459# outputmakefile generates a Makefile in the output directory, if using a
460# separate output directory. This allows convenient use of make in the
461# output directory.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462outputmakefile:
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200463ifneq ($(KBUILD_SRC),)
Andi Kleen92979992009-01-10 04:56:13 +0100464 $(Q)ln -fsn $(srctree) source
Jan Beulichfd5f0cd2006-05-02 12:33:20 +0200465 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
466 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
467endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468
Sam Ravnborgd8ecc5c2011-04-27 22:29:49 +0200469# Support for using generic headers in asm-generic
470PHONY += asm-generic
471asm-generic:
472 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
Catalin Marinas3c5994c2012-10-17 12:25:44 +0100473 src=asm obj=arch/$(SRCARCH)/include/generated/asm
474 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
475 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
Sam Ravnborgd8ecc5c2011-04-27 22:29:49 +0200476
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477# To make sure we do not include .config for any of the *config targets
478# catch them early, and hand them over to scripts/kconfig/Makefile
479# It is allowed to specify more targets when calling make, including
480# mixing *config targets and build targets.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200481# For example 'make oldconfig all'.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482# Detect when mixed targets is specified, and make a second invocation
483# of make so .config is not included in this case either (for *config).
484
David Howells10b63952012-10-02 18:01:57 +0100485version_h := include/generated/uapi/linux/version.h
Michal Marek223c24a2014-11-27 16:13:17 +0100486old_version_h := include/linux/version.h
David Howellsd183e6f2012-10-02 18:01:56 +0100487
Roman Zippel3eb3c742007-01-10 14:45:28 +0100488no-dot-config-targets := clean mrproper distclean \
Michal Marekfbae4d52014-11-28 13:31:43 +0100489 cscope gtags TAGS tags help% %docs check% coccicheck \
David Howellsd183e6f2012-10-02 18:01:56 +0100490 $(version_h) headers_% archheaders archscripts \
Linus Torvalds4aed2fd2010-08-06 09:30:52 -0700491 kernelversion %src-pkg
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492
493config-targets := 0
494mixed-targets := 0
495dot-config := 1
496
497ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
498 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
499 dot-config := 0
500 endif
501endif
502
503ifeq ($(KBUILD_EXTMOD),)
504 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
505 config-targets := 1
Masahiro Yamadad0d38cd2014-12-11 19:12:34 +0900506 ifneq ($(words $(MAKECMDGOALS)),1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 mixed-targets := 1
508 endif
509 endif
510endif
Michal Mareka85a41e2015-12-10 15:53:06 +0100511# install and module_install need also be processed one by one
512ifneq ($(filter install,$(MAKECMDGOALS)),)
513 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
514 mixed-targets := 1
515 endif
516endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517
Chris Fries740f1402018-12-03 11:56:19 -0800518ifeq ($(cc-name),clang)
519ifneq ($(CROSS_COMPILE),)
Nathan Chancellor5d68df32019-04-17 10:52:26 -0700520CLANG_TRIPLE ?= $(CROSS_COMPILE)
Greg Kroah-Hartmand4fff2d2019-08-06 18:39:35 +0200521CLANG_FLAGS += --target=$(notdir $(CLANG_TRIPLE:%-=%))
Nathan Chancellor5d68df32019-04-17 10:52:26 -0700522ifeq ($(shell $(srctree)/scripts/clang-android.sh $(CC) $(CLANG_FLAGS)), y)
523$(error "Clang with Android --target detected. Did you specify CLANG_TRIPLE?")
524endif
Nick Desaulniers1347aa22019-02-11 11:30:04 -0800525GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
Masahiro Yamada8ff3c2e2018-11-06 12:04:55 +0900526CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)
Nathan Chancellorb6268052018-12-14 20:24:28 -0700527GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
Chris Fries740f1402018-12-03 11:56:19 -0800528endif
529ifneq ($(GCC_TOOLCHAIN),)
Masahiro Yamada8ff3c2e2018-11-06 12:04:55 +0900530CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
Chris Fries740f1402018-12-03 11:56:19 -0800531endif
Chris Fries740f1402018-12-03 11:56:19 -0800532KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
533KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
534KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
535KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
536KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
Artem Borisov93fb3692018-12-07 11:20:28 +0400537KBUILD_CFLAGS += $(call cc-disable-warning, duplicate-decl-specifier)
Prasad Sodagudia5c48662017-10-02 15:19:57 -0700538KBUILD_CFLAGS += -Wno-undefined-optimized
539KBUILD_CFLAGS += -Wno-tautological-constant-out-of-range-compare
Prasad Sodagudi882d3492018-09-13 18:05:11 -0700540KBUILD_CFLAGS += $(call cc-option, -Wno-sometimes-uninitialized)
Behan Websterd06b1822014-09-15 17:10:34 -0700541KBUILD_CFLAGS += -Wno-asm-operand-widths
542KBUILD_CFLAGS += -Wno-initializer-overrides
543KBUILD_CFLAGS += -fno-builtin
Prasad Sodagudia5c48662017-10-02 15:19:57 -0700544
Chris Fries740f1402018-12-03 11:56:19 -0800545# Quiet clang warning: comparison of unsigned expression < 0 is always false
Behan Websterd06b1822014-09-15 17:10:34 -0700546
Chris Fries740f1402018-12-03 11:56:19 -0800547KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
548# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
549# source of a reference will be _MergedGlobals and not on of the whitelisted names.
550# See modpost pattern 2
551KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
552KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
Masahiro Yamada8ff3c2e2018-11-06 12:04:55 +0900553CLANG_FLAGS += -no-integrated-as
Nathan Chancellor7caebf62019-06-11 11:43:31 -0700554CLANG_FLAGS += -Werror=unknown-warning-option
Masahiro Yamada8ff3c2e2018-11-06 12:04:55 +0900555KBUILD_CFLAGS += $(CLANG_FLAGS)
556KBUILD_AFLAGS += $(CLANG_FLAGS)
Chris Fries740f1402018-12-03 11:56:19 -0800557else
558
Behan Websterd06b1822014-09-15 17:10:34 -0700559KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
Chris Fries740f1402018-12-03 11:56:19 -0800560# These warnings generated too much noise in a regular build.
561# Use make W=1 to enable them (see scripts/Makefile.build)
562KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
563KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
564endif
565
566
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567ifeq ($(mixed-targets),1)
568# ===========================================================================
569# We're called with mixed targets (*config and build targets).
570# Handle them one by one.
571
Masahiro Yamada9319f452014-04-09 15:51:35 +0900572PHONY += $(MAKECMDGOALS) __build_one_by_one
573
574$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
575 @:
576
577__build_one_by_one:
578 $(Q)set -e; \
579 for i in $(MAKECMDGOALS); do \
580 $(MAKE) -f $(srctree)/Makefile $$i; \
581 done
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582
583else
584ifeq ($(config-targets),1)
585# ===========================================================================
586# *config targets only - make sure prerequisites are updated, and descend
587# in scripts/kconfig to make the *config target
588
589# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
590# KBUILD_DEFCONFIG may point out an alternative default configuration
591# used for 'make defconfig'
Masahiro Yamadaa436bb72015-03-27 20:43:36 +0900592include arch/$(SRCARCH)/Makefile
Al Viro61bee202008-08-25 04:51:27 -0400593export KBUILD_DEFCONFIG KBUILD_KCONFIG
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594
Sam Ravnborg31110eb2008-12-13 23:00:45 +0100595config: scripts_basic outputmakefile FORCE
Sam Ravnborg31110eb2008-12-13 23:00:45 +0100596 $(Q)$(MAKE) $(build)=scripts/kconfig $@
597
598%config: scripts_basic outputmakefile FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 $(Q)$(MAKE) $(build)=scripts/kconfig $@
600
601else
602# ===========================================================================
603# Build targets only - this includes vmlinux, arch specific targets, clean
604# targets and others. In general all targets except *config targets.
605
606ifeq ($(KBUILD_EXTMOD),)
607# Additional helpers built in scripts/
608# Carefully list dependencies so we do not try to build scripts twice
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200609# in parallel
Paul Smith4f193362006-03-05 17:14:10 -0500610PHONY += scripts
Andreas Schwaba54292f2013-04-09 19:57:00 +0200611scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
Emese Revfy6b90bd42016-05-24 00:09:38 +0200612 asm-generic gcc-plugins
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613 $(Q)$(MAKE) $(build)=$(@)
614
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615# Objects we will link into vmlinux / subdirs we need to visit
616init-y := init/
Bryan Huntsman5df1dce2016-08-02 22:36:01 -0700617drivers-y := drivers/ sound/ firmware/ techpack/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618net-y := net/
619libs-y := lib/
620core-y := usr/
Feng Wu37d9fe42015-09-22 16:47:29 +0800621virt-y := virt/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622endif # KBUILD_EXTMOD
623
624ifeq ($(dot-config),1)
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200625# Read in config
626-include include/config/auto.conf
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200628ifeq ($(KBUILD_EXTMOD),)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629# Read in dependencies to all Kconfig* files, make sure to run
630# oldconfig if changes are detected.
Roman Zippelc955cca2006-06-08 22:12:39 -0700631-include include/config/auto.conf.cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633# To avoid any implicit rule to kick in, define an empty command
Roman Zippel14cdd3c2006-06-08 22:12:51 -0700634$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635
Roman Zippelc955cca2006-06-08 22:12:39 -0700636# If .config is newer than include/config/auto.conf, someone tinkered
Sam Ravnborg752625c2005-12-26 23:34:03 +0100637# with it and forgot to run make oldconfig.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200638# if auto.conf.cmd is missing then we are probably in a cleaned tree so
Sam Ravnborg752625c2005-12-26 23:34:03 +0100639# we execute the config step to be sure to catch updated Kconfig files
Michal Marekbc081dd2009-12-07 16:38:33 +0100640include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
642else
Sam Ravnborg264a2682009-10-18 00:49:24 +0200643# external modules needs include/generated/autoconf.h and include/config/auto.conf
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200644# but do not care if they are up-to-date. Use auto.conf to trigger the test
645PHONY += include/config/auto.conf
646
647include/config/auto.conf:
Sam Ravnborg264a2682009-10-18 00:49:24 +0200648 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
Michal Marek5369f552012-07-07 23:04:40 +0200649 echo >&2; \
650 echo >&2 " ERROR: Kernel configuration is invalid."; \
651 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
652 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
653 echo >&2 ; \
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200654 /bin/false)
655
656endif # KBUILD_EXTMOD
Roman Zippelc955cca2006-06-08 22:12:39 -0700657
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658else
659# Dummy target needed, because used as prerequisite
Roman Zippelc955cca2006-06-08 22:12:39 -0700660include/config/auto.conf: ;
Sam Ravnborg9ee4e332006-08-07 21:01:36 +0200661endif # $(dot-config)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662
Nicolas Pitre86556392016-12-02 15:11:50 -0500663# For the kernel to actually contain only the needed exported symbols,
664# we have to build modules as well to determine what those symbols are.
665# (this can be evaluated only once include/config/auto.conf has been included)
666ifdef CONFIG_TRIM_UNUSED_KSYMS
667 KBUILD_MODULES := 1
668endif
669
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670# The all: target is the default when no target is given on the
671# command line.
672# This allow a user to issue only 'make' to build a kernel including modules
Michal Marekc8447162010-06-03 10:54:58 +0200673# Defaults to vmlinux, but the arch makefile usually adds further targets
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674all: vmlinux
675
Masahiro Yamada97c66872017-10-12 18:22:25 +0900676KBUILD_CFLAGS += $(call cc-option,-fno-PIE)
677KBUILD_AFLAGS += $(call cc-option,-fno-PIE)
Nick Desaulniers8d921692018-04-26 14:28:07 -0700678CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \
679 $(call cc-option,-fno-tree-loop-im) \
680 $(call cc-disable-warning,maybe-uninitialized,)
Masahiro Yamada97c66872017-10-12 18:22:25 +0900681CFLAGS_KCOV := $(call cc-option,-fsanitize-coverage=trace-pc,)
682export CFLAGS_GCOV CFLAGS_KCOV
683
Sami Tolvanen475bdd72017-11-28 08:48:49 -0800684# Make toolchain changes before including arch/$(SRCARCH)/Makefile to ensure
685# ar/cc/ld-* macros return correct values.
686ifdef CONFIG_LTO_CLANG
687# use GNU gold with LLVMgold for LTO linking, and LD for vmlinux_link
688LDFINAL_vmlinux := $(LD)
689LD := $(LDGOLD)
690LDFLAGS += -plugin LLVMgold.so
691# use llvm-ar for building symbol tables from IR files, and llvm-dis instead
692# of objdump for processing symbol versions and exports
693LLVM_AR := llvm-ar
694LLVM_DIS := llvm-dis
695export LLVM_AR LLVM_DIS
696endif
697
Michal Marek6dd3f132015-07-16 18:23:53 +0200698# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
699# values of the respective KBUILD_* variables
700ARCH_CPPFLAGS :=
701ARCH_AFLAGS :=
702ARCH_CFLAGS :=
Masahiro Yamadaa436bb72015-03-27 20:43:36 +0900703include arch/$(SRCARCH)/Makefile
Geert Uytterhoevena1c48bb2014-05-27 09:54:12 +0200704
705KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
Linus Torvaldsef6000b2016-10-12 10:23:41 -0700706KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
Linus Torvalds78fbe212017-07-12 19:25:47 -0700707KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
708KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
709KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context)
Linus Torvalds7601d812019-05-01 11:05:41 -0700710KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
Arnd Bergmannb1a1d9b2018-07-26 10:13:22 +0200711KBUILD_CFLAGS += $(call cc-disable-warning, attribute-alias)
Geert Uytterhoevena1c48bb2014-05-27 09:54:12 +0200712
Nicholas Pigginb67067f2016-08-24 22:29:20 +1000713ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
714KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,)
715KBUILD_CFLAGS += $(call cc-option,-fdata-sections,)
716endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717
Sami Tolvanen475bdd72017-11-28 08:48:49 -0800718ifdef CONFIG_LTO_CLANG
719lto-clang-flags := -flto -fvisibility=hidden
720
721# allow disabling only clang LTO where needed
722DISABLE_LTO_CLANG := -fno-lto -fvisibility=default
723export DISABLE_LTO_CLANG
724endif
725
726ifdef CONFIG_LTO
727lto-flags := $(lto-clang-flags)
728KBUILD_CFLAGS += $(lto-flags)
729
730DISABLE_LTO := $(DISABLE_LTO_CLANG)
731export DISABLE_LTO
732
733# LDFINAL_vmlinux and LDFLAGS_FINAL_vmlinux can be set to override
734# the linker and flags for vmlinux_link.
735export LDFINAL_vmlinux LDFLAGS_FINAL_vmlinux
736endif
737
Sami Tolvanen00a195e2017-05-11 15:03:36 -0700738ifdef CONFIG_CFI_CLANG
Nathan Chancellorfc67a892019-04-09 10:46:35 -0700739cfi-clang-flags += -fsanitize=cfi $(call cc-option, -fsplit-lto-unit)
Sami Tolvanen00a195e2017-05-11 15:03:36 -0700740DISABLE_CFI_CLANG := -fno-sanitize=cfi
741ifdef CONFIG_MODULES
742cfi-clang-flags += -fsanitize-cfi-cross-dso
743DISABLE_CFI_CLANG += -fno-sanitize-cfi-cross-dso
744endif
745ifdef CONFIG_CFI_PERMISSIVE
746cfi-clang-flags += -fsanitize-recover=cfi -fno-sanitize-trap=cfi
747endif
748
749# also disable CFI when LTO is disabled
750DISABLE_LTO_CLANG += $(DISABLE_CFI_CLANG)
751# allow disabling only clang CFI where needed
752export DISABLE_CFI_CLANG
753endif
754
755ifdef CONFIG_CFI
756# cfi-flags are re-tested in prepare-compiler-check
757cfi-flags := $(cfi-clang-flags)
758KBUILD_CFLAGS += $(cfi-flags)
759
760DISABLE_CFI := $(DISABLE_CFI_CLANG)
761DISABLE_LTO += $(DISABLE_CFI)
762export DISABLE_CFI
763endif
764
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
Matthias Kaehlcke69505772019-04-23 12:04:25 -0700766KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767else
Arnd Bergmann815eb712016-04-25 17:35:28 +0200768ifdef CONFIG_PROFILE_ALL_BRANCHES
Arnd Bergmanna76bcf52016-11-10 17:44:44 +0100769KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,)
Arnd Bergmann815eb712016-04-25 17:35:28 +0200770else
771KBUILD_CFLAGS += -O2
772endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773endif
774
Arnd Bergmanna76bcf52016-11-10 17:44:44 +0100775KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
776 $(call cc-disable-warning,maybe-uninitialized,))
777
Jiri Kosina69102312014-08-06 16:08:43 -0700778# Tell gcc to never replace conditional load with a non-conditional one
779KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
780
Gleb Fotengauer-Malinovskiy21eaaa72017-03-20 20:15:53 +0300781# check for 'asm goto'
782ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
783 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
784 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
785endif
786
Emese Revfy6b90bd42016-05-24 00:09:38 +0200787include scripts/Makefile.gcc-plugins
788
Andi Kleen1873e872012-03-28 11:51:18 -0700789ifdef CONFIG_READABLE_ASM
790# Disable optimizations that make assembler listings hard to read.
791# reorder blocks reorders the control in the function
792# ipa clone creates specialized cloned functions
793# partial inlining inlines only parts of functions
794KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
795 $(call cc-option,-fno-ipa-cp-clone,) \
796 $(call cc-option,-fno-partial-inlining)
797endif
798
Mike Frysinger08f67462009-06-04 16:29:08 -0700799ifneq ($(CONFIG_FRAME_WARN),0)
Andi Kleen35bb5b12008-02-22 15:15:03 +0100800KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
801endif
802
Kees Cookc965b102016-07-26 15:21:17 -0700803# This selects the stack protector compiler flag. Testing it is delayed
804# until after .config has been reprocessed, in the prepare-compiler-check
805# target.
Kees Cook87796572013-12-19 11:35:59 -0800806ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
Kees Cook19952a92013-12-19 11:35:58 -0800807 stackp-flag := -fstack-protector
Kees Cookc965b102016-07-26 15:21:17 -0700808 stackp-name := REGULAR
Jan Beulich6c15b322014-02-25 15:01:48 -0800809else
810ifdef CONFIG_CC_STACKPROTECTOR_STRONG
Kees Cook87796572013-12-19 11:35:59 -0800811 stackp-flag := -fstack-protector-strong
Kees Cookc965b102016-07-26 15:21:17 -0700812 stackp-name := STRONG
Kees Cook19952a92013-12-19 11:35:58 -0800813else
814 # Force off for distro compilers that enable stack protector by default.
815 stackp-flag := $(call cc-option, -fno-stack-protector)
Tejun Heo5d707e92009-02-09 22:17:39 +0900816endif
Jan Beulich6c15b322014-02-25 15:01:48 -0800817endif
Kees Cookc965b102016-07-26 15:21:17 -0700818# Find arch-specific stack protector compiler sanity-checking script.
819ifdef CONFIG_CC_STACKPROTECTOR
Kees Cook228d96c2016-07-26 14:26:20 -0700820 stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
821 stackp-check := $(wildcard $(stackp-path))
Kees Cookc965b102016-07-26 15:21:17 -0700822endif
Kees Cook19952a92013-12-19 11:35:58 -0800823KBUILD_CFLAGS += $(stackp-flag)
Sam Ravnborge06b8b92008-02-13 22:43:28 +0100824
Masahiro Yamadab098b022017-11-27 21:15:13 +0900825ifeq ($(cc-name),clang)
826KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
Masahiro Yamadab098b022017-11-27 21:15:13 +0900827KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
828KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
Greg Kroah-Hartman9df256d2019-02-27 11:31:43 +0100829KBUILD_CFLAGS += $(call cc-disable-warning, duplicate-decl-specifier)
Masahiro Yamadab098b022017-11-27 21:15:13 +0900830# Quiet clang warning: comparison of unsigned expression < 0 is always false
831KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
832# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
833# source of a reference will be _MergedGlobals and not on of the whitelisted names.
834# See modpost pattern 2
835KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
836KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
Masahiro Yamadab098b022017-11-27 21:15:13 +0900837else
838
839# These warnings generated too much noise in a regular build.
840# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
841KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
Masahiro Yamadab098b022017-11-27 21:15:13 +0900842endif
843
Sodagudi Prasad9362c082018-02-06 15:46:51 -0800844KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845ifdef CONFIG_FRAME_POINTER
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200846KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847else
Rabin Vincent7e9501f2010-08-10 19:20:53 +0100848# Some targets (ARM with Thumb2, for example), can't be built with frame
849# pointers. For those, we don't have FUNCTION_TRACER automatically
850# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
851# incompatible with -fomit-frame-pointer with current GCC, so we don't use
852# -fomit-frame-pointer with FUNCTION_TRACER.
853ifndef CONFIG_FUNCTION_TRACER
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200854KBUILD_CFLAGS += -fomit-frame-pointer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855endif
Rabin Vincent7e9501f2010-08-10 19:20:53 +0100856endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857
Linus Torvalds2062afb2014-07-26 14:52:01 -0700858KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
859
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860ifdef CONFIG_DEBUG_INFO
Andi Kleen866ced92014-07-30 20:50:18 +0200861ifdef CONFIG_DEBUG_INFO_SPLIT
862KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
863else
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200864KBUILD_CFLAGS += -g
Andi Kleen866ced92014-07-30 20:50:18 +0200865endif
Behan Webster22883282014-02-14 15:19:17 -0800866KBUILD_AFLAGS += -Wa,-gdwarf-2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867endif
Andi Kleenbfaf2dd2014-07-30 20:50:19 +0200868ifdef CONFIG_DEBUG_INFO_DWARF4
869KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
870endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871
Andi Kleend6f4ceb2010-07-14 15:43:52 +0200872ifdef CONFIG_DEBUG_INFO_REDUCED
Andi Kleene82c4bb2013-02-07 13:58:40 -0800873KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
874 $(call cc-option,-fno-var-tracking)
Andi Kleend6f4ceb2010-07-14 15:43:52 +0200875endif
876
Steven Rostedt606576c2008-10-06 19:06:12 -0400877ifdef CONFIG_FUNCTION_TRACER
Heiko Carstensc0a80c02015-01-09 13:06:33 +0100878ifndef CC_FLAGS_FTRACE
879CC_FLAGS_FTRACE := -pg
880endif
881export CC_FLAGS_FTRACE
Steven Rostedta2546fa2011-02-09 13:15:59 -0500882ifdef CONFIG_HAVE_FENTRY
883CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
884endif
Heiko Carstensc0a80c02015-01-09 13:06:33 +0100885KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
Steven Rostedta2546fa2011-02-09 13:15:59 -0500886KBUILD_AFLAGS += $(CC_USING_FENTRY)
Steven Rostedt72441cb2010-10-13 17:12:30 -0400887ifdef CONFIG_DYNAMIC_FTRACE
Steven Rostedtcf4db252010-10-14 23:32:44 -0400888 ifdef CONFIG_HAVE_C_RECORDMCOUNT
Steven Rostedt72441cb2010-10-13 17:12:30 -0400889 BUILD_C_RECORDMCOUNT := y
890 export BUILD_C_RECORDMCOUNT
891 endif
892endif
Arnaldo Carvalho de Melo16444a82008-05-12 21:20:42 +0200893endif
894
Sam Ravnborg91341d42008-01-21 21:31:44 +0100895# We trigger additional mismatches with less inlining
896ifdef CONFIG_DEBUG_SECTION_MISMATCH
897KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
898endif
899
Sam Ravnborge8e69932005-04-30 16:51:42 -0700900# arch Makefile may override CC so keep this after arch Makefile is included
Rik van Riele8f5bdb02005-05-16 21:53:46 -0700901NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
Sam Ravnborge8e69932005-04-30 16:51:42 -0700902CHECKFLAGS += $(NOSTDINC_FLAGS)
903
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904# warn about C99 declaration after statement
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200905KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200907# disable pointer signed / unsigned warnings in gcc 4.0
Michal Marek8417da6f2011-05-02 12:51:15 +0200908KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909
Stephen Rothwell5e2669c2018-08-31 07:47:28 +1000910# disable stringop warnings in gcc 8+
911KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
912
Kirill Smelkovfe8d0a42009-04-09 15:34:34 +0400913# disable invalid "can't wrap" optimizations for signed / pointers
Linus Torvaldsa1378022009-07-12 11:25:04 -0700914KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
Linus Torvaldsd0115552009-03-19 15:53:19 -0700915
Daniel Borkmann733a4e12018-03-21 01:18:24 +0100916# clang sets -fmerge-all-constants by default as optimization, but this
917# is non-conforming behavior for C and in fact breaks the kernel, so we
918# need to disable it here generally.
919KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants)
920
921# for gcc -fno-merge-all-constants disables everything, but it is fine
922# to have actual conforming behavior enabled.
923KBUILD_CFLAGS += $(call cc-option,-fmerge-constants)
924
Linus Torvaldsb929ccc2017-12-29 17:34:43 -0800925# Make sure -fstack-check isn't enabled (like gentoo apparently did)
926KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,)
927
Andi Kleen8f7f5c92009-09-18 12:49:37 -0700928# conserve stack if available
929KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
930
Sergei Trofimovich80970472013-09-13 14:51:40 -0700931# disallow errors like 'EXPORT_GPL(foo);' with missing header
932KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
933
934# require functions to have arguments in prototypes, not empty 'int foo()'
935KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
936
Josh Triplettfe7c36c2013-12-23 13:56:06 -0800937# Prohibit date/time macros, which would make the build non-deterministic
938KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
939
Daniel Wagnerea8daa72016-03-08 09:29:09 +0100940# enforce correct pointer usage
941KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
942
Kees Cooka250cab2017-03-20 17:14:11 -0700943# Require designated initializers for all marked structures
944KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
945
Masahiro Yamada2e1dff72018-03-30 13:15:26 +0900946# change __FILE__ to the relative path from the srctree
947KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
948
Seth Forshee0446b032019-07-17 11:06:26 -0500949# ensure -fcf-protection is disabled when using retpoline as it is
950# incompatible with -mindirect-branch=thunk-extern
951ifdef CONFIG_RETPOLINE
952KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
953endif
954
Michal Marek40df7592011-04-20 13:45:30 +0200955# use the deterministic mode of AR if available
956KBUILD_ARFLAGS := $(call ar-option,D)
957
Masahiro Yamadaa436bb72015-03-27 20:43:36 +0900958include scripts/Makefile.kasan
959include scripts/Makefile.extrawarn
Andrey Ryabininc6d30852016-01-20 15:00:55 -0800960include scripts/Makefile.ubsan
Masahiro Yamadaa86fe352014-04-14 18:27:10 +0900961
Michal Marek61754c12015-07-01 17:19:30 +0200962# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
963# last assignments
964KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
965KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
966KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
Sam Ravnborg52bcc332007-10-15 22:03:58 +0200967
Roland McGrath18991192007-07-19 01:48:40 -0700968# Use --build-id when available.
969LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
Sam Ravnborgf86fd302009-09-19 10:14:33 +0200970 $(call cc-ldoption, -Wl$(comma)--build-id,))
Sam Ravnborg65881692010-07-28 17:33:09 +0200971KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
Roland McGrath18991192007-07-19 01:48:40 -0700972LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
973
Nicholas Pigginb67067f2016-08-24 22:29:20 +1000974ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
975LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
976endif
977
David Howells5d7d18f2009-03-04 11:59:07 -0800978ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
Andi Kleend79a2712009-09-16 22:36:55 +0200979LDFLAGS_vmlinux += $(call ld-option, -X,)
David Howells5d7d18f2009-03-04 11:59:07 -0800980endif
981
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982# Default kernel image to build when no specific target is given.
Sam Ravnborg070b98b2006-06-25 00:07:55 +0200983# KBUILD_IMAGE may be overruled on the command line or
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984# set in the environment
985# Also any assignments in arch/$(ARCH)/Makefile take precedence over
986# this default value
987export KBUILD_IMAGE ?= vmlinux
988
989#
990# INSTALL_PATH specifies where to place the updated kernel and system map
991# images. Default is /boot, but you can set it to other values
992export INSTALL_PATH ?= /boot
993
994#
Jason Cooperf4d4ffc2013-12-01 23:56:28 +0000995# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
996# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
997# an argument if needed. Otherwise it defaults to the kernel install path
998#
999export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1000
1001#
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1003# relocations required by build roots. This is not defined in the
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001004# makefile but the argument can be passed to make if needed.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005#
1006
Sam Ravnborgdf9df032006-01-16 12:46:07 +01001007MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008export MODLIB
1009
Theodore Ts'oac031f22006-06-21 20:53:09 -04001010#
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +09001011# INSTALL_MOD_STRIP, if defined, will cause modules to be
1012# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
1013# the default option --strip-debug will be used. Otherwise,
1014# INSTALL_MOD_STRIP value will be used as the options to the strip command.
Sam Ravnborg2ea03892009-01-14 21:38:20 +01001015
Theodore Ts'oac031f22006-06-21 20:53:09 -04001016ifdef INSTALL_MOD_STRIP
1017ifeq ($(INSTALL_MOD_STRIP),1)
Sam Ravnborg2ea03892009-01-14 21:38:20 +01001018mod_strip_cmd = $(STRIP) --strip-debug
Theodore Ts'oac031f22006-06-21 20:53:09 -04001019else
Sam Ravnborg2ea03892009-01-14 21:38:20 +01001020mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
Theodore Ts'oac031f22006-06-21 20:53:09 -04001021endif # INSTALL_MOD_STRIP=1
1022else
Sam Ravnborg2ea03892009-01-14 21:38:20 +01001023mod_strip_cmd = true
Theodore Ts'oac031f22006-06-21 20:53:09 -04001024endif # INSTALL_MOD_STRIP
1025export mod_strip_cmd
1026
Bertrand Jacquinbeb50df2014-08-27 20:31:56 +09301027# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
1028# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
1029# or CONFIG_MODULE_COMPRESS_XZ.
1030
1031mod_compress_cmd = true
1032ifdef CONFIG_MODULE_COMPRESS
1033 ifdef CONFIG_MODULE_COMPRESS_GZIP
Jason A. Donenfeld3d1450d2015-07-07 20:26:07 +02001034 mod_compress_cmd = gzip -n -f
Bertrand Jacquinbeb50df2014-08-27 20:31:56 +09301035 endif # CONFIG_MODULE_COMPRESS_GZIP
1036 ifdef CONFIG_MODULE_COMPRESS_XZ
Jason A. Donenfeld3d1450d2015-07-07 20:26:07 +02001037 mod_compress_cmd = xz -f
Bertrand Jacquinbeb50df2014-08-27 20:31:56 +09301038 endif # CONFIG_MODULE_COMPRESS_XZ
1039endif # CONFIG_MODULE_COMPRESS
1040export mod_compress_cmd
1041
P J P1bf49dd2013-11-12 15:11:44 -08001042# Select initial ramdisk compression format, default is gzip(1).
1043# This shall be used by the dracut(8) tool while creating an initramfs image.
1044#
Jan Beulich7ac18152013-12-18 17:08:57 -08001045INITRD_COMPRESS-y := gzip
1046INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
1047INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
1048INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
1049INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
1050INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
Linus Torvaldsb7000ad2013-12-20 16:52:45 -08001051# do not export INITRD_COMPRESS, since we didn't actually
1052# choose a sane default compression above.
1053# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054
Michal Marekd9d8d7e2013-01-25 13:41:31 +10301055ifdef CONFIG_MODULE_SIG_ALL
David Woodhouse3ee550f2015-08-14 16:17:16 +01001056$(eval $(call config_filename,MODULE_SIG_KEY))
1057
1058mod_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 +10301059else
1060mod_sign_cmd = true
1061endif
1062export mod_sign_cmd
1063
1064
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065ifeq ($(KBUILD_EXTMOD),)
David Howellscfc411e2015-08-14 15:20:41 +01001066core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067
1068vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
1069 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
Feng Wu37d9fe42015-09-22 16:47:29 +08001070 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071
1072vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
Feng Wu37d9fe42015-09-22 16:47:29 +08001073 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074
1075init-y := $(patsubst %/, %/built-in.o, $(init-y))
1076core-y := $(patsubst %/, %/built-in.o, $(core-y))
1077drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
1078net-y := $(patsubst %/, %/built-in.o, $(net-y))
1079libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
1080libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
1081libs-y := $(libs-y1) $(libs-y2)
Feng Wu37d9fe42015-09-22 16:47:29 +08001082virt-y := $(patsubst %/, %/built-in.o, $(virt-y))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +02001084# Externally visible symbols (used by link-vmlinux.sh)
Sam Ravnborg95698572012-05-05 10:18:40 +02001085export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
Feng Wu37d9fe42015-09-22 16:47:29 +08001086export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
Sam Ravnborg95698572012-05-05 10:18:40 +02001087export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +02001088export LDFLAGS_vmlinux
Michal Marek6615d6c2013-04-12 14:12:50 +02001089# used by scripts/pacmage/Makefile
Feng Wu37d9fe42015-09-22 16:47:29 +08001090export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +02001092vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093
Nicolas Pitre2441e782016-04-22 15:25:00 -04001094# Include targets which we want to execute sequentially if the rest of the
1095# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
1096# evaluated more than once.
1097PHONY += vmlinux_prereq
1098vmlinux_prereq: $(vmlinux-deps) FORCE
David Woodhouse0f836e5f2006-10-11 01:21:43 -07001099ifdef CONFIG_HEADERS_CHECK
David Woodhouse0e7af8d042006-10-13 16:04:23 +01001100 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
David Woodhouse0f836e5f2006-10-11 01:21:43 -07001101endif
Jan Kiszka3ee7b3f2015-02-17 13:46:36 -08001102ifdef CONFIG_GDB_SCRIPTS
1103 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
1104endif
Nicolas Pitre2441e782016-04-22 15:25:00 -04001105ifdef CONFIG_TRIM_UNUSED_KSYMS
Nicolas Ferreba79d402016-04-25 17:55:08 +02001106 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
Nicolas Pitre86556392016-12-02 15:11:50 -05001107 "$(MAKE) -f $(srctree)/Makefile vmlinux"
Nicolas Pitre2441e782016-04-22 15:25:00 -04001108endif
Nicolas Pitre23121ca2016-01-26 21:50:18 -05001109
1110# standalone target for easier testing
1111include/generated/autoksyms.h: FORCE
Nicolas Ferreba79d402016-04-25 17:55:08 +02001112 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
Nicolas Pitre23121ca2016-01-26 21:50:18 -05001113
Nicholas Pigginfbe6e372016-08-24 22:29:21 +10001114ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1115
1116# Final link of vmlinux with optional arch pass after final link
1117 cmd_link-vmlinux = \
1118 $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ; \
1119 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
Nicolas Pitre2441e782016-04-22 15:25:00 -04001120
Nicolas Pitreedf69472016-04-26 16:48:44 -04001121vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +02001122 +$(call if_changed,link-vmlinux)
Sam Ravnborg741f98f2007-07-17 10:54:06 +02001123
Nicolas Pitredd924782016-02-28 22:00:00 -05001124# Build samples along the rest of the kernel
1125ifdef CONFIG_SAMPLES
1126vmlinux-dirs += samples
1127endif
1128
Masahiro Yamada38385f82014-04-28 16:26:18 +09001129# The actual objects are generated when descending,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130# make sure no implicit rule kicks in
Sam Ravnborg1f2bfbd2012-05-05 10:18:41 +02001131$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132
1133# Handle descending into subdirectories listed in $(vmlinux-dirs)
1134# Preset locale variables to speed up the build process. Limit locale
1135# tweaks to this spot to avoid wrong language settings when running
1136# make menuconfig etc.
1137# Error messages still appears in the original language
1138
Paul Smith4f193362006-03-05 17:14:10 -05001139PHONY += $(vmlinux-dirs)
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001140$(vmlinux-dirs): prepare scripts
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141 $(Q)$(MAKE) $(build)=$@
1142
Michal Marek0d0e7712013-07-11 15:34:51 +02001143define filechk_kernel.release
1144 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1145endef
1146
Geert Uytterhoeven83a35e32013-06-28 11:27:31 +02001147# Store (new) KERNELRELEASE string in include/config/kernel.release
Roman Zippelf1d28fb2006-06-08 22:12:43 -07001148include/config/kernel.release: include/config/auto.conf FORCE
Michal Marek0d0e7712013-07-11 15:34:51 +02001149 $(call filechk,kernel.release)
Sam Ravnborgcb584552006-01-09 21:20:34 +01001150
1151
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152# Things we need to do before we recursively start building the kernel
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001153# or the modules are listed in "prepare".
1154# A multi level approach is used. prepareN is processed before prepareN-1.
1155# archprepare is used in arch Makefiles and when processed asm symlink,
1156# version.h and scripts_basic is processed / created.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001158# Listed in dependency order
Paul Smith4f193362006-03-05 17:14:10 -05001159PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001160
Sam Ravnborg86feeaa2005-09-09 19:28:28 +02001161# prepare3 is used to check if we are building in a separate output directory,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162# and if so do:
1163# 1) Check that make has not been executed in the kernel src $(srctree)
Roman Zippelf1d28fb2006-06-08 22:12:43 -07001164prepare3: include/config/kernel.release
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165ifneq ($(KBUILD_SRC),)
Mike Frysingerfd54f502008-11-06 03:31:35 -05001166 @$(kecho) ' Using $(srctree) as source for kernel'
Roman Zippelc955cca2006-06-08 22:12:39 -07001167 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
Michal Marek5369f552012-07-07 23:04:40 +02001168 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1169 echo >&2 " in the '$(srctree)' directory.";\
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170 /bin/false; \
1171 fi;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172endif
1173
Kees Cookc965b102016-07-26 15:21:17 -07001174# prepare2 creates a makefile if using a separate output directory.
1175# From this point forward, .config has been reprocessed, so any rules
1176# that need to depend on updated CONFIG_* values can be checked here.
1177prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178
David Howellsd183e6f2012-10-02 18:01:56 +01001179prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
Sam Ravnborgf7f16b72009-10-18 00:00:43 +02001180 include/config/auto.conf
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001181 $(cmd_crmodverdir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182
H. Peter Anvin6520fe52012-05-08 21:22:24 +03001183archprepare: archheaders archscripts prepare1 scripts_basic
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001184
Emese Revfy6b90bd42016-05-24 00:09:38 +02001185prepare0: archprepare gcc-plugins
Sam Ravnborg8d36a622005-09-10 21:05:36 +02001186 $(Q)$(MAKE) $(build)=.
Sam Ravnborg86feeaa2005-09-09 19:28:28 +02001187
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188# All the preparing..
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -06001189prepare: prepare0 prepare-objtool
1190
Josh Poimboeuf3b27a0c2016-03-03 11:39:30 -06001191ifdef CONFIG_STACK_VALIDATION
Steven Rostedtc2bb9e32016-04-20 11:32:35 -04001192 has_libelf := $(call try-run,\
1193 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
Josh Poimboeuf3b27a0c2016-03-03 11:39:30 -06001194 ifeq ($(has_libelf),1)
1195 objtool_target := tools/objtool FORCE
1196 else
Jean Delvareb573d802016-06-16 10:54:20 +02001197 $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
Josh Poimboeuf3b27a0c2016-03-03 11:39:30 -06001198 SKIP_STACK_VALIDATION := 1
1199 export SKIP_STACK_VALIDATION
1200 endif
1201endif
1202
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -06001203PHONY += prepare-objtool
Josh Poimboeuf3b27a0c2016-03-03 11:39:30 -06001204prepare-objtool: $(objtool_target)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205
Kees Cookc965b102016-07-26 15:21:17 -07001206# Check for CONFIG flags that require compiler support. Abort the build
1207# after .config has been processed, but before the kernel build starts.
1208#
1209# For security-sensitive CONFIG options, we don't want to fallback and/or
1210# silently change which compiler flags will be used, since that leads to
1211# producing kernels with different security feature characteristics
1212# depending on the compiler used. (For example, "But I selected
1213# CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1214PHONY += prepare-compiler-check
1215prepare-compiler-check: FORCE
Sami Tolvanen475bdd72017-11-28 08:48:49 -08001216# Make sure we're using a supported toolchain with LTO_CLANG
1217ifdef CONFIG_LTO_CLANG
1218 ifneq ($(call clang-ifversion, -ge, 0500, y), y)
1219 @echo Cannot use CONFIG_LTO_CLANG: requires clang 5.0 or later >&2 && exit 1
1220 endif
1221 ifneq ($(call gold-ifversion, -ge, 112000000, y), y)
1222 @echo Cannot use CONFIG_LTO_CLANG: requires GNU gold 1.12 or later >&2 && exit 1
1223 endif
1224endif
1225# Make sure compiler supports LTO flags
1226ifdef lto-flags
1227 ifeq ($(call cc-option, $(lto-flags)),)
1228 @echo Cannot use CONFIG_LTO: $(lto-flags) not supported by compiler \
1229 >&2 && exit 1
1230 endif
1231endif
Kees Cookc965b102016-07-26 15:21:17 -07001232# Make sure compiler supports requested stack protector flag.
1233ifdef stackp-name
1234 ifeq ($(call cc-option, $(stackp-flag)),)
1235 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1236 $(stackp-flag) not supported by compiler >&2 && exit 1
1237 endif
1238endif
1239# Make sure compiler does not have buggy stack-protector support.
1240ifdef stackp-check
1241 ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1242 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1243 $(stackp-flag) available but compiler is broken >&2 && exit 1
1244 endif
1245endif
Sami Tolvanen00a195e2017-05-11 15:03:36 -07001246ifdef cfi-flags
1247 ifeq ($(call cc-option, $(cfi-flags)),)
1248 @echo Cannot use CONFIG_CFI: $(cfi-flags) not supported by compiler >&2 && exit 1
1249 endif
1250endif
Kees Cookc965b102016-07-26 15:21:17 -07001251 @:
1252
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253# Generate some files
1254# ---------------------------------------------------------------------------
1255
1256# KERNELRELEASE can change from a few different places, meaning version.h
1257# needs to be updated, so this check is forced on all builds
1258
1259uts_len := 64
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001260define filechk_utsrelease.h
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001262 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1263 exit 1; \
1264 fi; \
1265 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266endef
1267
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001268define filechk_version.h
Jesper Juhl450c6072012-02-16 22:49:15 +01001269 (echo \#define LINUX_VERSION_CODE $(shell \
1270 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001271 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1272endef
1273
David Howellsd183e6f2012-10-02 18:01:56 +01001274$(version_h): $(srctree)/Makefile FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275 $(call filechk,version.h)
Michal Marek223c24a2014-11-27 16:13:17 +01001276 $(Q)rm -f $(old_version_h)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277
Sam Ravnborg273b2812009-10-18 00:52:28 +02001278include/generated/utsrelease.h: include/config/kernel.release FORCE
Sam Ravnborg63104ee2006-07-03 23:30:54 +02001279 $(call filechk,utsrelease.h)
1280
Vegard Nossum179efcb2008-12-16 12:33:43 +01001281PHONY += headerdep
1282headerdep:
Peter Foley9663d982011-04-26 17:17:11 -04001283 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1284 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
Vegard Nossum179efcb2008-12-16 12:33:43 +01001285
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286# ---------------------------------------------------------------------------
David Woodhouse88ecf812008-05-29 11:01:51 +03001287# Firmware install
1288INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1289export INSTALL_FW_PATH
1290
1291PHONY += firmware_install
Masahiro Yamada2e8d6962016-03-13 09:13:55 +09001292firmware_install:
David Woodhouse88ecf812008-05-29 11:01:51 +03001293 @mkdir -p $(objtree)/firmware
1294 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1295
1296# ---------------------------------------------------------------------------
David Woodhouse8d730cf2006-06-18 11:58:39 +01001297# Kernel headers
David Woodhouse8d730cf2006-06-18 11:58:39 +01001298
Sam Ravnborge6883b12008-06-05 16:43:46 +02001299#Default location for installed headers
1300export INSTALL_HDR_PATH = $(objtree)/usr
1301
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001302# If we do an all arch process set dst to asm-$(hdr-arch)
Nicolas Dichtel365052f2017-03-27 14:20:16 +02001303hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(hdr-arch), dst=include)
Sam Ravnborge6883b12008-06-05 16:43:46 +02001304
H. Peter Anvin052ad272011-11-17 13:17:35 -08001305PHONY += archheaders
1306archheaders:
1307
H. Peter Anvin6520fe52012-05-08 21:22:24 +03001308PHONY += archscripts
1309archscripts:
1310
Sam Ravnborge6883b12008-06-05 16:43:46 +02001311PHONY += __headers
Masahiro Yamada2e8d6962016-03-13 09:13:55 +09001312__headers: $(version_h) scripts_basic asm-generic archheaders archscripts
Mike Waychisone1b702c2011-03-14 23:34:25 -07001313 $(Q)$(MAKE) $(build)=scripts build_unifdef
David Woodhouse6d716272006-09-24 22:16:03 +01001314
1315PHONY += headers_install_all
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001316headers_install_all:
1317 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
David Woodhouse6d716272006-09-24 22:16:03 +01001318
David Woodhouse8d730cf2006-06-18 11:58:39 +01001319PHONY += headers_install
Sam Ravnborge6883b12008-06-05 16:43:46 +02001320headers_install: __headers
David Howells10b63952012-10-02 18:01:57 +01001321 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1322 $(error Headers not exportable for the $(SRCARCH) architecture))
1323 $(Q)$(MAKE) $(hdr-inst)=include/uapi
Nicolas Dichtel365052f2017-03-27 14:20:16 +02001324 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi $(hdr-dst)
Bryan Huntsman5df1dce2016-08-02 22:36:01 -07001325 $(Q)$(MAKE) $(hdr-inst)=techpack
David Woodhouse8d730cf2006-06-18 11:58:39 +01001326
Mike Frysinger1f857122007-02-14 00:33:02 -08001327PHONY += headers_check_all
1328headers_check_all: headers_install_all
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001329 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
Mike Frysinger1f857122007-02-14 00:33:02 -08001330
David Woodhouse68475352006-06-18 12:02:10 +01001331PHONY += headers_check
1332headers_check: headers_install
David Howells10b63952012-10-02 18:01:57 +01001333 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
Masahiro Yamada59b85962017-05-16 14:15:03 +09001334 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi $(hdr-dst) HDRCHECK=1
Bryan Huntsman5df1dce2016-08-02 22:36:01 -07001335 $(Q)$(MAKE) $(hdr-inst)=techpack HDRCHECK=1
David Woodhouse68475352006-06-18 12:02:10 +01001336
David Woodhouse8d730cf2006-06-18 11:58:39 +01001337# ---------------------------------------------------------------------------
Shuah Khan5a5da782014-08-07 13:07:46 -06001338# Kernel selftest
1339
1340PHONY += kselftest
1341kselftest:
1342 $(Q)$(MAKE) -C tools/testing/selftests run_tests
1343
Wang Longdcb825a2015-10-08 02:41:18 +00001344kselftest-clean:
1345 $(Q)$(MAKE) -C tools/testing/selftests clean
1346
Bamvor Jian Zhang3d6dee72016-01-08 15:27:34 +08001347PHONY += kselftest-merge
1348kselftest-merge:
1349 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1350 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1351 -m $(objtree)/.config \
1352 $(srctree)/tools/testing/selftests/*/config
1353 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1354
Shuah Khan5a5da782014-08-07 13:07:46 -06001355# ---------------------------------------------------------------------------
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356# Modules
1357
1358ifdef CONFIG_MODULES
1359
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001360# By default, build modules as well
Linus Torvalds1da177e2005-04-16 15:20:36 -07001361
Michal Marek73d13932010-03-10 12:28:58 +01001362all: modules
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +09001364# Build modules
Tejun Heo551559e2007-12-07 21:04:30 +09001365#
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +09001366# A module can be listed more than once in obj-m resulting in
1367# duplicate lines in modules.order files. Those are removed
1368# using awk while concatenating to the final file.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369
Paul Smith4f193362006-03-05 17:14:10 -05001370PHONY += modules
Michal Marek2da30e72010-06-07 22:22:12 +02001371modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
Tejun Heo551559e2007-12-07 21:04:30 +09001372 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
Mike Frysingerfd54f502008-11-06 03:31:35 -05001373 @$(kecho) ' Building modules, stage 2.';
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001374 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
David Woodhouse44463f72008-07-25 14:17:19 -04001375 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376
Michal Mareka6c36632010-03-08 10:07:12 +01001377modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1378 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1379
Michal Marek73d13932010-03-10 12:28:58 +01001380%/modules.builtin: include/config/auto.conf
Michal Mareka6c36632010-03-08 10:07:12 +01001381 $(Q)$(MAKE) $(modbuiltin)=$*
1382
Linus Torvalds1da177e2005-04-16 15:20:36 -07001383
1384# Target to prepare building external modules
Paul Smith4f193362006-03-05 17:14:10 -05001385PHONY += modules_prepare
Sam Ravnborg5bb78262005-09-11 22:30:22 +02001386modules_prepare: prepare scripts
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387
1388# Target to install modules
Paul Smith4f193362006-03-05 17:14:10 -05001389PHONY += modules_install
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390modules_install: _modinst_ _modinst_post
1391
Paul Smith4f193362006-03-05 17:14:10 -05001392PHONY += _modinst_
Michal Marek2da30e72010-06-07 22:22:12 +02001393_modinst_:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001394 @rm -rf $(MODLIB)/kernel
1395 @rm -f $(MODLIB)/source
1396 @mkdir -p $(MODLIB)/kernel
Michal Marek890676c2014-04-25 17:36:14 +02001397 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1399 rm -f $(MODLIB)/build ; \
Michal Marek7e1c0472014-04-25 17:29:45 +02001400 ln -s $(CURDIR) $(MODLIB)/build ; \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001401 fi
Tejun Heo551559e2007-12-07 21:04:30 +09001402 @cp -f $(objtree)/modules.order $(MODLIB)/
Michal Marekbc081dd2009-12-07 16:38:33 +01001403 @cp -f $(objtree)/modules.builtin $(MODLIB)/
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001404 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001406# This depmod is only for convenience to give the initial
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407# boot a modules.dep even before / is mounted read-write. However the
1408# boot script depmod is the master version.
Paul Smith4f193362006-03-05 17:14:10 -05001409PHONY += _modinst_post
Linus Torvalds6d128e12013-07-10 19:02:51 -07001410_modinst_post: _modinst_
David Woodhouse88ecf812008-05-29 11:01:51 +03001411 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001412 $(call cmd,depmod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413
Josh Boyerd890f512012-11-05 09:09:24 +10301414ifeq ($(CONFIG_MODULE_SIG), y)
1415PHONY += modules_sign
1416modules_sign:
1417 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1418endif
1419
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420else # CONFIG_MODULES
1421
1422# Modules not configured
1423# ---------------------------------------------------------------------------
1424
Masahiro Yamada612e47c2016-03-13 09:39:22 +09001425PHONY += modules modules_install
1426modules modules_install:
Michal Marek5369f552012-07-07 23:04:40 +02001427 @echo >&2
1428 @echo >&2 "The present kernel configuration has modules disabled."
1429 @echo >&2 "Type 'make config' and enable loadable module support."
1430 @echo >&2 "Then build a kernel with module support enabled."
1431 @echo >&2
Linus Torvalds1da177e2005-04-16 15:20:36 -07001432 @exit 1
1433
1434endif # CONFIG_MODULES
1435
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436###
1437# Cleaning is done on three levels.
1438# make clean Delete most generated files
1439# Leave enough to build external modules
1440# make mrproper Delete the current configuration, and all generated files
1441# make distclean Remove editor backup files, patch leftover files and the like
1442
1443# Directories & files removed with 'make clean'
1444CLEAN_DIRS += $(MODVERDIR)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001445
1446# Directories & files removed with 'make mrproper'
Sam Ravnborgd8ecc5c2011-04-27 22:29:49 +02001447MRPROPER_DIRS += include/config usr/include include/generated \
Masahiro Yamada3fbb43d2014-04-28 16:32:43 +09001448 arch/*/include/generated .tmp_objdiff
Masahiro Yamadac22bd32c2015-01-08 17:29:38 +09001449MRPROPER_FILES += .config .config.old .version .old_version \
Rusty Russelld5b71932012-10-02 14:35:24 +09301450 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
David Woodhousefb117942015-07-20 21:16:30 +01001451 signing_key.pem signing_key.priv signing_key.x509 \
1452 x509.genkey extra_certificates signing_key.x509.keyid \
Jan Kiszka3ee7b3f2015-02-17 13:46:36 -08001453 signing_key.x509.signer vmlinux-gdb.py
Linus Torvalds1da177e2005-04-16 15:20:36 -07001454
1455# clean - Delete most, but leave enough to build external modules
1456#
1457clean: rm-dirs := $(CLEAN_DIRS)
1458clean: rm-files := $(CLEAN_FILES)
Gerard Snitselaarfb68d4b2012-02-04 02:55:59 -07001459clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460
Pawel Mollbd1ee802012-10-29 11:23:02 +00001461PHONY += $(clean-dirs) clean archclean vmlinuxclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001462$(clean-dirs):
1463 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1464
Pawel Mollbd1ee802012-10-29 11:23:02 +00001465vmlinuxclean:
1466 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
Nicholas Pigginfbe6e372016-08-24 22:29:21 +10001467 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
Pawel Mollbd1ee802012-10-29 11:23:02 +00001468
1469clean: archclean vmlinuxclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001470
1471# mrproper - Delete all generated files, including .config
1472#
1473mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1474mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1475mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1476
Paul Smith4f193362006-03-05 17:14:10 -05001477PHONY += $(mrproper-dirs) mrproper archmrproper
Linus Torvalds1da177e2005-04-16 15:20:36 -07001478$(mrproper-dirs):
1479 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1480
1481mrproper: clean archmrproper $(mrproper-dirs)
1482 $(call cmd,rmdirs)
1483 $(call cmd,rmfiles)
1484
1485# distclean
1486#
Paul Smith4f193362006-03-05 17:14:10 -05001487PHONY += distclean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001488
1489distclean: mrproper
1490 @find $(srctree) $(RCS_FIND_IGNORE) \
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001491 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
Masahiro Yamadaa03fcb502014-03-28 16:36:12 +09001493 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001494 -type f -print | xargs rm -f
1495
1496
1497# Packaging of the kernel to various formats
1498# ---------------------------------------------------------------------------
1499# rpm target kept for backward compatibility
Michal Marekc79624c2014-07-04 22:53:52 +02001500package-dir := scripts/package
Linus Torvalds1da177e2005-04-16 15:20:36 -07001501
Arnaldo Carvalho de Melobafb6742010-06-07 07:44:25 -03001502%src-pkg: FORCE
1503 $(Q)$(MAKE) $(build)=$(package-dir) $@
Zach Brown031ecc62006-06-08 22:12:37 -07001504%pkg: include/config/kernel.release FORCE
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001505 $(Q)$(MAKE) $(build)=$(package-dir) $@
Zach Brown031ecc62006-06-08 22:12:37 -07001506rpm: include/config/kernel.release FORCE
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001507 $(Q)$(MAKE) $(build)=$(package-dir) $@
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508
1509
1510# Brief documentation of the typical targets used
1511# ---------------------------------------------------------------------------
1512
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001513boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
Konstantin Khlebnikova1e7b7b2014-10-28 17:18:20 +04001514boards := $(sort $(notdir $(boards)))
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001515board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1516board-dirs := $(sort $(notdir $(board-dirs:/=)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517
Masahiro Yamadafe69b422016-03-13 09:39:55 +09001518PHONY += help
Linus Torvalds1da177e2005-04-16 15:20:36 -07001519help:
1520 @echo 'Cleaning targets:'
Samuel Tardieu5ea084e2006-12-12 19:09:40 +01001521 @echo ' clean - Remove most generated files but keep the config and'
Jesper Juhl5cc8d242006-09-24 14:01:08 +02001522 @echo ' enough build support to build external modules'
Samuel Tardieu5ea084e2006-12-12 19:09:40 +01001523 @echo ' mrproper - Remove all generated files + config + various backup files'
Jesper Juhl5cc8d242006-09-24 14:01:08 +02001524 @echo ' distclean - mrproper + remove editor backup and patch files'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001525 @echo ''
1526 @echo 'Configuration targets:'
1527 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1528 @echo ''
1529 @echo 'Other generic targets:'
1530 @echo ' all - Build all targets marked with [*]'
1531 @echo '* vmlinux - Build the bare kernel'
1532 @echo '* modules - Build all modules'
Bodo Eggert9cc5d742005-11-23 20:11:34 +01001533 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
David Woodhouse88ecf812008-05-29 11:01:51 +03001534 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1535 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001536 @echo ' dir/ - Build all files in dir and below'
Wang YanQing40ab87a2015-12-11 00:35:19 +08001537 @echo ' dir/file.[ois] - Build specified target only'
Vinícius Tinti30c02b62017-04-24 13:04:58 -07001538 @echo ' dir/file.ll - Build the LLVM assembly file'
1539 @echo ' (requires compiler support for LLVM assembly generation)'
Joe Perches62718972010-01-13 09:31:44 -08001540 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1541 @echo ' (requires a recent binutils and recent build (System.map))'
Sam Ravnborg155ad602005-07-07 17:56:08 -07001542 @echo ' dir/file.ko - Build module including final link'
Robert P. J. Dayc4d5ee62009-04-24 12:35:23 -04001543 @echo ' modules_prepare - Set up for building external modules'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001544 @echo ' tags/TAGS - Generate tags file for editors'
1545 @echo ' cscope - Generate cscope index'
Jianbin Kangf4ed1002011-01-14 20:07:05 +08001546 @echo ' gtags - Generate GNU GLOBAL index'
Michal Marek3f1d9a62014-07-11 15:57:24 +02001547 @echo ' kernelrelease - Output the release version string (use with make -s)'
1548 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1549 @echo ' image_name - Output the image name (use with make -s)'
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001550 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
Geert Uytterhoeven59df3232007-01-29 13:47:01 +01001551 echo ' (default: $(INSTALL_HDR_PATH))'; \
Sam Ravnborg2fb9b1b2008-06-21 00:24:17 +02001552 echo ''
Linus Torvalds1da177e2005-04-16 15:20:36 -07001553 @echo 'Static analysers'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001554 @echo ' checkstack - Generate a list of stack hogs'
1555 @echo ' namespacecheck - Name space analysis on compiled kernel'
Sam Ravnborgaa025e72007-11-14 21:34:55 +01001556 @echo ' versioncheck - Sanity check on version.h usage'
Randy Dunlapec2d9872007-11-04 12:01:55 -08001557 @echo ' includecheck - Check for duplicate included header files'
Adrian Bunk295ac052007-08-24 23:04:56 +02001558 @echo ' export_report - List the usages of all exported symbols'
Vegard Nossum179efcb2008-12-16 12:33:43 +01001559 @echo ' headers_check - Sanity check on exported headers'
Nicolas Palix74425ee2010-06-06 17:15:01 +02001560 @echo ' headerdep - Detect inclusion cycles in headers'
1561 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1562 @echo ''
Shuah Khan5a5da782014-08-07 13:07:46 -06001563 @echo 'Kernel selftest'
1564 @echo ' kselftest - Build and run kernel selftest (run as root)'
1565 @echo ' Build, install, and boot kernel before'
1566 @echo ' running kselftest on it'
Wang Longdcb825a2015-10-08 02:41:18 +00001567 @echo ' kselftest-clean - Remove all generated kselftest files'
Bamvor Jian Zhang3d6dee72016-01-08 15:27:34 +08001568 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existed'
1569 @echo ' .config.'
Shuah Khan5a5da782014-08-07 13:07:46 -06001570 @echo ''
Linus Torvalds1da177e2005-04-16 15:20:36 -07001571 @echo 'Kernel packaging:'
Sam Ravnborg6c2133e2006-03-21 07:22:35 +01001572 @$(MAKE) $(build)=$(package-dir) help
Linus Torvalds1da177e2005-04-16 15:20:36 -07001573 @echo ''
1574 @echo 'Documentation targets:'
Jani Nikulaebc88ef2016-06-22 15:41:48 +03001575 @$(MAKE) -f $(srctree)/Documentation/Makefile.sphinx dochelp
1576 @echo ''
Linus Torvalds1da177e2005-04-16 15:20:36 -07001577 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1578 @echo ''
Andres Salomon01dee182008-04-25 22:34:58 -04001579 @echo 'Architecture specific targets ($(SRCARCH)):'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001580 @$(if $(archhelp),$(archhelp),\
Andres Salomon01dee182008-04-25 22:34:58 -04001581 echo ' No architecture specific help defined for $(SRCARCH)')
Linus Torvalds1da177e2005-04-16 15:20:36 -07001582 @echo ''
1583 @$(if $(boards), \
1584 $(foreach b, $(boards), \
1585 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1586 echo '')
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001587 @$(if $(board-dirs), \
1588 $(foreach b, $(board-dirs), \
1589 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1590 printf " %-16s - Show all of the above\\n" help-boards; \
1591 echo '')
Linus Torvalds1da177e2005-04-16 15:20:36 -07001592
1593 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
Sam Ravnborg45d506b2006-08-08 21:35:14 +02001594 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001595 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
Dustin Kirkland701842e2006-05-23 15:57:23 -05001596 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1597 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
Ingo Molnaraf07ce32011-06-16 13:26:23 +02001598 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
Sam Ravnborg28bc20d2011-04-27 22:15:27 +02001599 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1600 @echo ' 1: warnings which may be relevant and do not occur too often'
1601 @echo ' 2: warnings which occur quite often but may still be relevant'
1602 @echo ' 3: more obscure warnings, can most likely be ignored'
Michal Mareka6de5532011-04-29 14:45:31 +02001603 @echo ' Multiple levels can be combined with W=12 or W=123'
Linus Torvalds1da177e2005-04-16 15:20:36 -07001604 @echo ''
1605 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1606 @echo 'For further info see the ./README file'
1607
1608
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001609help-board-dirs := $(addprefix help-,$(board-dirs))
1610
1611help-boards: $(help-board-dirs)
1612
Michal Marekfbae4d52014-11-28 13:31:43 +01001613boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
Segher Boessenkool5dffbe82008-04-06 22:16:07 +02001614
1615$(help-board-dirs): help-%:
1616 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1617 @$(if $(boards-per-dir), \
1618 $(foreach b, $(boards-per-dir), \
1619 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1620 echo '')
1621
1622
Linus Torvalds1da177e2005-04-16 15:20:36 -07001623# Documentation targets
1624# ---------------------------------------------------------------------------
Mauro Carvalho Chehabd5651272016-08-18 11:53:39 -03001625DOC_TARGETS := xmldocs sgmldocs psdocs latexdocs pdfdocs htmldocs mandocs installmandocs epubdocs cleandocs
Jani Nikula22cba312016-05-19 15:14:05 +03001626PHONY += $(DOC_TARGETS)
1627$(DOC_TARGETS): scripts_basic FORCE
Ben Hutchingsb479bfd2015-09-28 01:09:52 +01001628 $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
Jani Nikula22cba312016-05-19 15:14:05 +03001629 $(Q)$(MAKE) $(build)=Documentation -f $(srctree)/Documentation/Makefile.sphinx $@
Linus Torvalds1da177e2005-04-16 15:20:36 -07001630 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1631
1632else # KBUILD_EXTMOD
1633
1634###
1635# External module support.
1636# When building external modules the kernel used as basis is considered
1637# read-only, and no consistency checks are made and the make
1638# system is not used on the basis kernel. If updates are required
1639# in the basis kernel ordinary make commands (without M=...) must
1640# be used.
1641#
1642# The following are the only valid targets when building external
1643# modules.
1644# make M=dir clean Delete all automatically generated files
1645# make M=dir modules Make all modules in specified dir
1646# make M=dir Same as 'make M=dir modules'
1647# make M=dir modules_install
Sam Ravnborg070b98b2006-06-25 00:07:55 +02001648# Install the modules built in the module directory
Linus Torvalds1da177e2005-04-16 15:20:36 -07001649# Assumes install directory is already created
1650
1651# We are always building modules
1652KBUILD_MODULES := 1
Linus Torvalds1da177e2005-04-16 15:20:36 -07001653
Paul Smith4f193362006-03-05 17:14:10 -05001654PHONY += $(objtree)/Module.symvers
Linus Torvalds1da177e2005-04-16 15:20:36 -07001655$(objtree)/Module.symvers:
1656 @test -e $(objtree)/Module.symvers || ( \
1657 echo; \
1658 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1659 echo " is missing; modules will have no dependencies and modversions."; \
1660 echo )
1661
1662module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
Paul Smith4f193362006-03-05 17:14:10 -05001663PHONY += $(module-dirs) modules
Masahiro Yamadab1335cd2018-11-22 08:11:54 +09001664$(module-dirs): prepare $(objtree)/Module.symvers
Linus Torvalds1da177e2005-04-16 15:20:36 -07001665 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1666
1667modules: $(module-dirs)
Mike Frysingerfd54f502008-11-06 03:31:35 -05001668 @$(kecho) ' Building modules, stage 2.';
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001669 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
Linus Torvalds1da177e2005-04-16 15:20:36 -07001670
Paul Smith4f193362006-03-05 17:14:10 -05001671PHONY += modules_install
Sam Ravnborga67dc212006-01-28 23:51:57 +01001672modules_install: _emodinst_ _emodinst_post
Adrian Bunke6304662006-02-14 15:58:15 +01001673
Paul Smith4f193362006-03-05 17:14:10 -05001674install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1675PHONY += _emodinst_
Sam Ravnborga67dc212006-01-28 23:51:57 +01001676_emodinst_:
Sam Ravnborga67dc212006-01-28 23:51:57 +01001677 $(Q)mkdir -p $(MODLIB)/$(install-dir)
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001678 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
Linus Torvalds1da177e2005-04-16 15:20:36 -07001679
Paul Smith4f193362006-03-05 17:14:10 -05001680PHONY += _emodinst_post
Sam Ravnborga67dc212006-01-28 23:51:57 +01001681_emodinst_post: _emodinst_
1682 $(call cmd,depmod)
1683
Linus Torvalds1da177e2005-04-16 15:20:36 -07001684clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1685
Paul Smith4f193362006-03-05 17:14:10 -05001686PHONY += $(clean-dirs) clean
Linus Torvalds1da177e2005-04-16 15:20:36 -07001687$(clean-dirs):
1688 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1689
1690clean: rm-dirs := $(MODVERDIR)
Michal Marek88d7be02010-09-06 12:00:08 +02001691clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
Linus Torvalds1da177e2005-04-16 15:20:36 -07001692
Masahiro Yamadafe69b422016-03-13 09:39:55 +09001693PHONY += help
Linus Torvalds1da177e2005-04-16 15:20:36 -07001694help:
1695 @echo ' Building external modules.'
1696 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1697 @echo ''
1698 @echo ' modules - default target, build the module(s)'
1699 @echo ' modules_install - install the module'
1700 @echo ' clean - remove generated files in module directory only'
1701 @echo ''
Sam Ravnborg06300b22006-01-25 07:13:18 +01001702
1703# Dummies...
Paul Smith4f193362006-03-05 17:14:10 -05001704PHONY += prepare scripts
Masahiro Yamadab1335cd2018-11-22 08:11:54 +09001705prepare:
1706 $(cmd_crmodverdir)
Sam Ravnborg06300b22006-01-25 07:13:18 +01001707scripts: ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001708endif # KBUILD_EXTMOD
1709
Michal Marek88d7be02010-09-06 12:00:08 +02001710clean: $(clean-dirs)
1711 $(call cmd,rmdirs)
1712 $(call cmd,rmfiles)
Kevin Cernekee43f67c92011-05-10 15:47:16 -07001713 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
Michal Marek88d7be02010-09-06 12:00:08 +02001714 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
David Howellsaddbcdb2012-09-26 10:09:50 +01001715 -o -name '*.ko.*' \
Andi Kleen866ced92014-07-30 20:50:18 +02001716 -o -name '*.dwo' \
Rasmus Villemoesd523b252015-08-20 11:53:29 +02001717 -o -name '*.su' \
Michal Marek88d7be02010-09-06 12:00:08 +02001718 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1719 -o -name '*.symtypes' -o -name 'modules.order' \
1720 -o -name modules.builtin -o -name '.tmp_*.o.*' \
Emese Revfy6b90bd42016-05-24 00:09:38 +02001721 -o -name '*.c.[012]*.*' \
Vinícius Tinti30c02b62017-04-24 13:04:58 -07001722 -o -name '*.ll' \
Sami Tolvanen475bdd72017-11-28 08:48:49 -08001723 -o -name '*.gcno' \
1724 -o -name '*.*.symversions' \) -type f -print | xargs rm -f
Michal Marek88d7be02010-09-06 12:00:08 +02001725
Linus Torvalds1da177e2005-04-16 15:20:36 -07001726# Generate tags for editors
1727# ---------------------------------------------------------------------------
Sam Ravnborga680eed2008-12-03 22:24:13 +01001728quiet_cmd_tags = GEN $@
1729 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
Linus Torvalds1da177e2005-04-16 15:20:36 -07001730
Jianbin Kangf4ed1002011-01-14 20:07:05 +08001731tags TAGS cscope gtags: FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001732 $(call cmd,tags)
1733
Linus Torvalds1da177e2005-04-16 15:20:36 -07001734# Scripts to check various things for consistency
1735# ---------------------------------------------------------------------------
1736
Peter Foley279f3dd2011-04-26 17:15:01 -04001737PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1738
Linus Torvalds1da177e2005-04-16 15:20:36 -07001739includecheck:
Peter Foley436f8762011-04-26 17:18:29 -04001740 find $(srctree)/* $(RCS_FIND_IGNORE) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001741 -name '*.[hcS]' -type f -print | sort \
Geert Uytterhoeven80007432007-11-05 11:51:44 +01001742 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
Linus Torvalds1da177e2005-04-16 15:20:36 -07001743
1744versioncheck:
Peter Foley2ee2d292011-04-26 17:19:28 -04001745 find $(srctree)/* $(RCS_FIND_IGNORE) \
Linus Torvalds1da177e2005-04-16 15:20:36 -07001746 -name '*.[hcS]' -type f -print | sort \
Geert Uytterhoeven80007432007-11-05 11:51:44 +01001747 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
Linus Torvalds1da177e2005-04-16 15:20:36 -07001748
Nicolas Palix74425ee2010-06-06 17:15:01 +02001749coccicheck:
1750 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1751
Linus Torvalds1da177e2005-04-16 15:20:36 -07001752namespacecheck:
1753 $(PERL) $(srctree)/scripts/namespace.pl
1754
Adrian Bunk295ac052007-08-24 23:04:56 +02001755export_report:
1756 $(PERL) $(srctree)/scripts/export_report.pl
1757
Linus Torvalds1da177e2005-04-16 15:20:36 -07001758endif #ifeq ($(config-targets),1)
1759endif #ifeq ($(mixed-targets),1)
1760
Mike Marciniszync398ff02013-06-24 08:48:37 -04001761PHONY += checkstack kernelrelease kernelversion image_name
Jeff Dikee3ccf6e2006-09-27 01:50:37 -07001762
Jeff Dike011e3a92006-12-13 00:34:12 -08001763# UML needs a little special treatment here. It wants to use the host
1764# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1765# else wants $(ARCH), including people doing cross-builds, which means
1766# that $(SUBARCH) doesn't work here.
1767ifeq ($(ARCH), um)
1768CHECKSTACK_ARCH := $(SUBARCH)
1769else
1770CHECKSTACK_ARCH := $(ARCH)
1771endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001772checkstack:
1773 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
Jeff Dike011e3a92006-12-13 00:34:12 -08001774 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001775
Amerigo Wang7b8ea532010-08-20 05:36:06 -04001776kernelrelease:
1777 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
Amerigo Wang01ab1782010-06-28 10:45:21 +08001778
Sam Ravnborgcb584552006-01-09 21:20:34 +01001779kernelversion:
Sam Ravnborg2244cbd2006-01-16 12:12:12 +01001780 @echo $(KERNELVERSION)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001781
Mike Marciniszync398ff02013-06-24 08:48:37 -04001782image_name:
1783 @echo $(KBUILD_IMAGE)
1784
Borislav Petkovea01fa92012-04-11 18:36:18 +02001785# Clear a bunch of variables before executing the submake
1786tools/: FORCE
David Howellsbf351822012-11-05 21:02:08 +00001787 $(Q)mkdir -p $(objtree)/tools
Josh Poimboeufafdfe5f2017-01-18 22:16:55 -06001788 $(Q)$(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 +02001789
1790tools/%: FORCE
David Howellsbf351822012-11-05 21:02:08 +00001791 $(Q)mkdir -p $(objtree)/tools
Josh Poimboeufafdfe5f2017-01-18 22:16:55 -06001792 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
Borislav Petkovea01fa92012-04-11 18:36:18 +02001793
Sam Ravnborg06300b22006-01-25 07:13:18 +01001794# Single targets
1795# ---------------------------------------------------------------------------
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001796# Single targets are compatible with:
Robert P. J. Daye1b85132008-02-03 15:14:02 +02001797# - build with mixed source and output
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001798# - build with separate output dir 'make O=...'
1799# - external modules
1800#
1801# target-dir => where to store outputfile
1802# build-dir => directory in kernel source tree to use
Sam Ravnborg06300b22006-01-25 07:13:18 +01001803
Sam Ravnborg06300b22006-01-25 07:13:18 +01001804ifeq ($(KBUILD_EXTMOD),)
Sam Ravnborgaa360872006-04-06 08:25:31 +02001805 build-dir = $(patsubst %/,%,$(dir $@))
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001806 target-dir = $(dir $@)
Sam Ravnborg06300b22006-01-25 07:13:18 +01001807else
1808 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001809 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1810 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
Sam Ravnborg06300b22006-01-25 07:13:18 +01001811endif
1812
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001813%.s: %.c prepare scripts FORCE
1814 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1815%.i: %.c prepare scripts FORCE
1816 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1817%.o: %.c prepare scripts FORCE
1818 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1819%.lst: %.c prepare scripts FORCE
1820 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1821%.s: %.S prepare scripts FORCE
1822 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1823%.o: %.S prepare scripts FORCE
1824 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
Andreas Gruenbacher15fde672006-05-09 20:37:30 +02001825%.symtypes: %.c prepare scripts FORCE
1826 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
Vinícius Tinti30c02b62017-04-24 13:04:58 -07001827%.ll: %.c prepare scripts FORCE
1828 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001829
1830# Modules
Sam Ravnborg31110eb2008-12-13 23:00:45 +01001831/: prepare scripts FORCE
Sam Ravnborg31110eb2008-12-13 23:00:45 +01001832 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1833 $(build)=$(build-dir)
Peter Foley8e2faea2014-09-25 11:23:58 -07001834# Make sure the latest headers are built for Documentation
Arnd Bergmannddea05f2016-07-04 16:39:35 +02001835Documentation/ samples/: headers_install
Sam Ravnborg31110eb2008-12-13 23:00:45 +01001836%/: prepare scripts FORCE
Sam Ravnborg06300b22006-01-25 07:13:18 +01001837 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001838 $(build)=$(build-dir)
1839%.ko: prepare scripts FORCE
Sam Ravnborg06300b22006-01-25 07:13:18 +01001840 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
Sam Ravnborgbc2546a2006-04-05 12:57:21 +02001841 $(build)=$(build-dir) $(@:.ko=.o)
Sam Ravnborgb805aa02006-08-08 21:36:08 +02001842 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
Sam Ravnborg06300b22006-01-25 07:13:18 +01001843
Masahiro Yamada38385f82014-04-28 16:26:18 +09001844# FIXME Should go into a make.lib or something
Linus Torvalds1da177e2005-04-16 15:20:36 -07001845# ===========================================================================
1846
1847quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1848 cmd_rmdirs = rm -rf $(rm-dirs)
1849
1850quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1851 cmd_rmfiles = rm -f $(rm-files)
1852
Uwe Kleine-Königbc3c26f2008-04-21 22:53:56 +00001853# Run depmod only if we have System.map and depmod is executable
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001854quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
Michal Marek569658d2011-06-15 22:15:47 +02001855 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
Rusty Russellb92021b2013-03-15 15:04:17 +10301856 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
Sam Ravnborg50a8ec32007-10-18 21:24:21 +02001857
Sam Ravnborg7bb9d092007-10-19 22:20:02 +02001858# Create temporary dir for module support files
Sam Ravnborgab19f872007-10-22 11:23:07 +02001859# clean it up only when building all modules
1860cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1861 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001862
Linus Torvalds1da177e2005-04-16 15:20:36 -07001863# read all saved command lines
1864
1865targets := $(wildcard $(sort $(targets)))
1866cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1867
1868ifneq ($(cmd_files),)
1869 $(cmd_files): ; # Do not try to update included dependency files
1870 include $(cmd_files)
1871endif
1872
Linus Torvalds1da177e2005-04-16 15:20:36 -07001873endif # skip-makefile
1874
Paul Smith4f193362006-03-05 17:14:10 -05001875PHONY += FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001876FORCE:
Paul Smith4f193362006-03-05 17:14:10 -05001877
Paul Smith4f193362006-03-05 17:14:10 -05001878# Declare the contents of the .PHONY variable as phony. We keep that
Kirill Smelkovfe8d0a42009-04-09 15:34:34 +04001879# information in a variable so we can use it in if_changed and friends.
Paul Smith4f193362006-03-05 17:14:10 -05001880.PHONY: $(PHONY)