1 b2441318SGreg Kroah-Hartman# SPDX-License-Identifier: GPL-2.0 2 bfeffd15SLinus TorvaldsVERSION = 5 3 54ecb8f7SLinus TorvaldsPATCHLEVEL = 4 4 55922c9dSLinus TorvaldsSUBLEVEL = 0 5 *d6d5df1dSLinus TorvaldsEXTRAVERSION = -rc5 6 *d6d5df1dSLinus TorvaldsNAME = Kleptomaniac Octopus 7 1da177e4SLinus Torvalds 8 1da177e4SLinus Torvalds# *DOCUMENTATION* 9 1da177e4SLinus Torvalds# To see a list of typical targets execute "make help" 10 1da177e4SLinus Torvalds# More info can be located in ./README 11 1da177e4SLinus Torvalds# Comments in this file are targeted only to the developer, do not 12 1da177e4SLinus Torvalds# expect to learn how to build the kernel reading this file. 13 1da177e4SLinus Torvalds 14 ba634eceSMasahiro Yamada# That's our default target when none is given on the command line 15 ba634eceSMasahiro YamadaPHONY := _all 16 ba634eceSMasahiro Yamada_all: 17 ba634eceSMasahiro Yamada 18 1da177e4SLinus Torvalds# We are using a recursive build, so we need to do a little thinking 19 1da177e4SLinus Torvalds# to get the ordering right. 20 1da177e4SLinus Torvalds# 21 1da177e4SLinus Torvalds# Most importantly: sub-Makefiles should only ever modify files in 22 1da177e4SLinus Torvalds# their own directory. If in some directory we have a dependency on 23 1da177e4SLinus Torvalds# a file in another dir (which doesn't happen often, but it's often 24 f49821eeSNicholas Piggin# unavoidable when linking the built-in.a targets which finally 25 1da177e4SLinus Torvalds# turn into vmlinux), we will call a sub make in that other dir, and 26 1da177e4SLinus Torvalds# after that we are sure that everything which is in that other dir 27 1da177e4SLinus Torvalds# is now up to date. 28 1da177e4SLinus Torvalds# 29 1da177e4SLinus Torvalds# The only cases where we need to modify files which have global 30 1da177e4SLinus Torvalds# effects are thus separated out and done before the recursive 31 1da177e4SLinus Torvalds# descending is started. They are now explicitly listed as the 32 1da177e4SLinus Torvalds# prepare rule. 33 1da177e4SLinus Torvalds 34 221cc2d2SMasahiro Yamadaifneq ($(sub_make_done),1) 35 3812b8c5SMasahiro Yamada 36 3812b8c5SMasahiro Yamada# Do not use make's built-in rules and variables 37 3812b8c5SMasahiro Yamada# (this increases performance and avoids hard-to-debug behaviour) 38 3812b8c5SMasahiro YamadaMAKEFLAGS += -rR 39 3812b8c5SMasahiro Yamada 40 3812b8c5SMasahiro Yamada# Avoid funny character set dependencies 41 3812b8c5SMasahiro Yamadaunexport LC_ALL 42 3812b8c5SMasahiro YamadaLC_COLLATE=C 43 3812b8c5SMasahiro YamadaLC_NUMERIC=C 44 3812b8c5SMasahiro Yamadaexport LC_COLLATE LC_NUMERIC 45 3812b8c5SMasahiro Yamada 46 3812b8c5SMasahiro Yamada# Avoid interference with shell env settings 47 3812b8c5SMasahiro Yamadaunexport GREP_OPTIONS 48 3812b8c5SMasahiro Yamada 49 066b7ed9SMichal Marek# Beautify output 50 066b7ed9SMichal Marek# --------------------------------------------------------------------------- 51 066b7ed9SMichal Marek# 52 066b7ed9SMichal Marek# Normally, we echo the whole command before executing it. By making 53 066b7ed9SMichal Marek# that echo $($(quiet)$(cmd)), we now have the possibility to set 54 066b7ed9SMichal Marek# $(quiet) to choose other forms of output instead, e.g. 55 066b7ed9SMichal Marek# 56 066b7ed9SMichal Marek# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 57 066b7ed9SMichal Marek# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 58 066b7ed9SMichal Marek# 59 066b7ed9SMichal Marek# If $(quiet) is empty, the whole command will be printed. 60 066b7ed9SMichal Marek# If it is set to "quiet_", only the short version will be printed. 61 066b7ed9SMichal Marek# If it is set to "silent_", nothing will be printed at all, since 62 066b7ed9SMichal Marek# the variable $(silent_cmd_cc_o_c) doesn't exist. 63 066b7ed9SMichal Marek# 64 066b7ed9SMichal Marek# A simple variant is to prefix commands with $(Q) - that's useful 65 066b7ed9SMichal Marek# for commands that shall be hidden in non-verbose mode. 66 066b7ed9SMichal Marek# 67 066b7ed9SMichal Marek# $(Q)ln $@ :< 68 066b7ed9SMichal Marek# 69 066b7ed9SMichal Marek# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 70 066b7ed9SMichal Marek# If KBUILD_VERBOSE equals 1 then the above command is displayed. 71 066b7ed9SMichal Marek# 72 1da177e4SLinus Torvalds# To put more focus on warnings, be less verbose as default 73 1da177e4SLinus Torvalds# Use 'make V=1' to see the full commands 74 1da177e4SLinus Torvalds 75 1da177e4SLinus Torvaldsifeq ("$(origin V)", "command line") 76 1da177e4SLinus Torvalds KBUILD_VERBOSE = $(V) 77 1da177e4SLinus Torvaldsendif 78 1da177e4SLinus Torvaldsifndef KBUILD_VERBOSE 79 1da177e4SLinus Torvalds KBUILD_VERBOSE = 0 80 1da177e4SLinus Torvaldsendif 81 1da177e4SLinus Torvalds 82 066b7ed9SMichal Marekifeq ($(KBUILD_VERBOSE),1) 83 066b7ed9SMichal Marek quiet = 84 066b7ed9SMichal Marek Q = 85 066b7ed9SMichal Marekelse 86 066b7ed9SMichal Marek quiet=quiet_ 87 066b7ed9SMichal Marek Q = @ 88 066b7ed9SMichal Marekendif 89 066b7ed9SMichal Marek 90 066b7ed9SMichal Marek# If the user is running make -s (silent mode), suppress echoing of 91 066b7ed9SMichal Marek# commands 92 066b7ed9SMichal Marek 93 6f0fa58eSMasahiro Yamadaifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 94 066b7ed9SMichal Marek quiet=silent_ 95 066b7ed9SMichal Marekendif 96 066b7ed9SMichal Marek 97 066b7ed9SMichal Marekexport quiet Q KBUILD_VERBOSE 98 066b7ed9SMichal Marek 99 25b146c5SMasahiro Yamada# Kbuild will save output files in the current working directory. 100 25b146c5SMasahiro Yamada# This does not need to match to the root of the kernel source tree. 101 25b146c5SMasahiro Yamada# 102 25b146c5SMasahiro Yamada# For example, you can do this: 103 25b146c5SMasahiro Yamada# 104 25b146c5SMasahiro Yamada# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 105 25b146c5SMasahiro Yamada# 106 25b146c5SMasahiro Yamada# If you want to save output files in a different location, there are 107 25b146c5SMasahiro Yamada# two syntaxes to specify it. 108 25b146c5SMasahiro Yamada# 109 1da177e4SLinus Torvalds# 1) O= 110 1da177e4SLinus Torvalds# Use "make O=dir/to/store/output/files/" 111 1da177e4SLinus Torvalds# 112 1da177e4SLinus Torvalds# 2) Set KBUILD_OUTPUT 113 25b146c5SMasahiro Yamada# Set the environment variable KBUILD_OUTPUT to point to the output directory. 114 25b146c5SMasahiro Yamada# export KBUILD_OUTPUT=dir/to/store/output/files/; make 115 1da177e4SLinus Torvalds# 116 1da177e4SLinus Torvalds# The O= assignment takes precedence over the KBUILD_OUTPUT environment 117 1da177e4SLinus Torvalds# variable. 118 1da177e4SLinus Torvalds 119 25b146c5SMasahiro Yamada# Do we want to change the working directory? 120 1da177e4SLinus Torvaldsifeq ("$(origin O)", "command line") 121 1da177e4SLinus Torvalds KBUILD_OUTPUT := $(O) 122 1da177e4SLinus Torvaldsendif 123 1da177e4SLinus Torvalds 124 25b146c5SMasahiro Yamadaifneq ($(KBUILD_OUTPUT),) 125 25b146c5SMasahiro Yamada# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 126 25b146c5SMasahiro Yamada# expand a shell special character '~'. We use a somewhat tedious way here. 127 25b146c5SMasahiro Yamadaabs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 128 25b146c5SMasahiro Yamada$(if $(abs_objtree),, \ 129 25b146c5SMasahiro Yamada $(error failed to create output directory "$(KBUILD_OUTPUT)")) 130 25b146c5SMasahiro Yamada 131 25b146c5SMasahiro Yamada# $(realpath ...) resolves symlinks 132 25b146c5SMasahiro Yamadaabs_objtree := $(realpath $(abs_objtree)) 133 25b146c5SMasahiro Yamadaelse 134 25b146c5SMasahiro Yamadaabs_objtree := $(CURDIR) 135 25b146c5SMasahiro Yamadaendif # ifneq ($(KBUILD_OUTPUT),) 136 25b146c5SMasahiro Yamada 137 25b146c5SMasahiro Yamadaifeq ($(abs_objtree),$(CURDIR)) 138 25b146c5SMasahiro Yamada# Suppress "Entering directory ..." unless we are changing the work directory. 139 25b146c5SMasahiro YamadaMAKEFLAGS += --no-print-directory 140 25b146c5SMasahiro Yamadaelse 141 25b146c5SMasahiro Yamadaneed-sub-make := 1 142 51193b76SRobert Jarzmikendif 143 51193b76SRobert Jarzmik 144 25b146c5SMasahiro Yamadaabs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST)))) 145 1da177e4SLinus Torvalds 146 25b146c5SMasahiro Yamadaifneq ($(words $(subst :, ,$(abs_srctree))), 1) 147 25b146c5SMasahiro Yamada$(error source directory cannot contain spaces or colons) 148 25b146c5SMasahiro Yamadaendif 149 25b146c5SMasahiro Yamada 150 25b146c5SMasahiro Yamadaifneq ($(abs_srctree),$(abs_objtree)) 151 80463f1bSMasahiro Yamada# Look for make include files relative to root of kernel src 152 80463f1bSMasahiro Yamada# 153 80463f1bSMasahiro Yamada# This does not become effective immediately because MAKEFLAGS is re-parsed 154 25b146c5SMasahiro Yamada# once after the Makefile is read. We need to invoke sub-make. 155 25b146c5SMasahiro YamadaMAKEFLAGS += --include-dir=$(abs_srctree) 156 688931a5SMasahiro Yamadaneed-sub-make := 1 157 25b146c5SMasahiro Yamadaendif 158 3812b8c5SMasahiro Yamada 159 688931a5SMasahiro Yamadaifneq ($(filter 3.%,$(MAKE_VERSION)),) 160 688931a5SMasahiro Yamada# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 161 688931a5SMasahiro Yamada# We need to invoke sub-make to avoid implicit rules in the top Makefile. 162 688931a5SMasahiro Yamadaneed-sub-make := 1 163 688931a5SMasahiro Yamada# Cancel implicit rules for this Makefile. 164 688931a5SMasahiro Yamada$(lastword $(MAKEFILE_LIST)): ; 165 688931a5SMasahiro Yamadaendif 166 688931a5SMasahiro Yamada 167 25b146c5SMasahiro Yamadaexport abs_srctree abs_objtree 168 221cc2d2SMasahiro Yamadaexport sub_make_done := 1 169 221cc2d2SMasahiro Yamada 170 688931a5SMasahiro Yamadaifeq ($(need-sub-make),1) 171 688931a5SMasahiro Yamada 172 0b35786dSMilton MillerPHONY += $(MAKECMDGOALS) sub-make 173 0b35786dSMilton Miller 174 0209987fSMasahiro Yamada$(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make 175 16f89098SCharles Keepax @: 176 0b35786dSMilton Miller 177 c4e6fff1SCao jin# Invoke a second make in the output directory, passing relevant variables 178 2e8d696bSMasahiro Yamadasub-make: 179 25b146c5SMasahiro Yamada $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 180 1da177e4SLinus Torvalds 181 688931a5SMasahiro Yamadaendif # need-sub-make 182 221cc2d2SMasahiro Yamadaendif # sub_make_done 183 688931a5SMasahiro Yamada 184 1da177e4SLinus Torvalds# We process the rest of the Makefile if this is the final invocation of make 185 688931a5SMasahiro Yamadaifeq ($(need-sub-make),) 186 1da177e4SLinus Torvalds 187 7ff52571SMasahiro Yamada# Do not print "Entering directory ...", 188 7ff52571SMasahiro Yamada# but we want to display it when entering to the output directory 189 7ff52571SMasahiro Yamada# so that IDEs/editors are able to understand relative filenames. 190 7ff52571SMasahiro YamadaMAKEFLAGS += --no-print-directory 191 7ff52571SMasahiro Yamada 192 aa55c8e2SMasahiro Yamada# Call a source code checker (by default, "sparse") as part of the 193 aa55c8e2SMasahiro Yamada# C compilation. 194 aa55c8e2SMasahiro Yamada# 195 aa55c8e2SMasahiro Yamada# Use 'make C=1' to enable checking of only re-compiled files. 196 aa55c8e2SMasahiro Yamada# Use 'make C=2' to enable checking of *all* source files, regardless 197 aa55c8e2SMasahiro Yamada# of whether they are re-compiled or not. 198 aa55c8e2SMasahiro Yamada# 199 036db11cSCao jin# See the file "Documentation/dev-tools/sparse.rst" for more details, 200 036db11cSCao jin# including where to get the "sparse" utility. 201 aa55c8e2SMasahiro Yamada 202 aa55c8e2SMasahiro Yamadaifeq ("$(origin C)", "command line") 203 aa55c8e2SMasahiro Yamada KBUILD_CHECKSRC = $(C) 204 aa55c8e2SMasahiro Yamadaendif 205 aa55c8e2SMasahiro Yamadaifndef KBUILD_CHECKSRC 206 aa55c8e2SMasahiro Yamada KBUILD_CHECKSRC = 0 207 aa55c8e2SMasahiro Yamadaendif 208 aa55c8e2SMasahiro Yamada 209 7e35b425SMasahiro Yamada# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 210 7e35b425SMasahiro Yamada# directory of external module to build. Setting M= takes precedence. 211 aa55c8e2SMasahiro Yamadaifeq ("$(origin M)", "command line") 212 aa55c8e2SMasahiro Yamada KBUILD_EXTMOD := $(M) 213 aa55c8e2SMasahiro Yamadaendif 214 aa55c8e2SMasahiro Yamada 215 051f278eSMasahiro Yamadaexport KBUILD_CHECKSRC KBUILD_EXTMOD 216 051f278eSMasahiro Yamada 217 394053f4SMasahiro Yamadaextmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 218 394053f4SMasahiro Yamada 219 25b146c5SMasahiro Yamadaifeq ($(abs_srctree),$(abs_objtree)) 220 9da0763bSMichal Marek # building in the source tree 221 9da0763bSMichal Marek srctree := . 222 051f278eSMasahiro Yamada building_out_of_srctree := 223 9da0763bSMichal Marekelse 224 25b146c5SMasahiro Yamada ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 225 9da0763bSMichal Marek # building in a subdirectory of the source tree 226 9da0763bSMichal Marek srctree := .. 227 9da0763bSMichal Marek else 228 25b146c5SMasahiro Yamada srctree := $(abs_srctree) 229 9da0763bSMichal Marek endif 230 051f278eSMasahiro Yamada building_out_of_srctree := 1 231 9da0763bSMichal Marekendif 232 2c1f4f12SMasahiro Yamada 233 95fd3f87SMasahiro Yamadaifneq ($(KBUILD_ABS_SRCTREE),) 234 95fd3f87SMasahiro Yamadasrctree := $(abs_srctree) 235 95fd3f87SMasahiro Yamadaendif 236 2c1f4f12SMasahiro Yamada 237 7e1c0477SMichal Marekobjtree := . 238 6b12de69SMasahiro YamadaVPATH := $(srctree) 239 1da177e4SLinus Torvalds 240 051f278eSMasahiro Yamadaexport building_out_of_srctree srctree objtree VPATH 241 1da177e4SLinus Torvalds 242 2c1f4f12SMasahiro Yamada# To make sure we do not include .config for any of the *config targets 243 2c1f4f12SMasahiro Yamada# catch them early, and hand them over to scripts/kconfig/Makefile 244 2c1f4f12SMasahiro Yamada# It is allowed to specify more targets when calling make, including 245 2c1f4f12SMasahiro Yamada# mixing *config targets and build targets. 246 2c1f4f12SMasahiro Yamada# For example 'make oldconfig all'. 247 2c1f4f12SMasahiro Yamada# Detect when mixed targets is specified, and make a second invocation 248 2c1f4f12SMasahiro Yamada# of make so .config is not included in this case either (for *config). 249 2c1f4f12SMasahiro Yamada 250 2c1f4f12SMasahiro Yamadaversion_h := include/generated/uapi/linux/version.h 251 2c1f4f12SMasahiro Yamadaold_version_h := include/linux/version.h 252 2c1f4f12SMasahiro Yamada 253 22340a06SMasahiro Yamadaclean-targets := %clean mrproper cleandocs 254 22340a06SMasahiro Yamadano-dot-config-targets := $(clean-targets) \ 255 2c1f4f12SMasahiro Yamada cscope gtags TAGS tags help% %docs check% coccicheck \ 256 59b2bd05SMasahiro Yamada $(version_h) headers headers_% archheaders archscripts \ 257 63e31a67SMasahiro Yamada %asm-generic kernelversion %src-pkg 258 a29d4d8cSMasahiro Yamadano-sync-config-targets := $(no-dot-config-targets) install %install \ 259 a29d4d8cSMasahiro Yamada kernelrelease 260 394053f4SMasahiro Yamadasingle-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ 261 2c1f4f12SMasahiro Yamada 262 2042b548SMasahiro Yamadaconfig-build := 263 2042b548SMasahiro Yamadamixed-build := 264 2042b548SMasahiro Yamadaneed-config := 1 265 d7942413SMasahiro Yamadamay-sync-config := 1 266 394053f4SMasahiro Yamadasingle-build := 267 2c1f4f12SMasahiro Yamada 268 2c1f4f12SMasahiro Yamadaifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 269 2c1f4f12SMasahiro Yamada ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 270 2042b548SMasahiro Yamada need-config := 271 2c1f4f12SMasahiro Yamada endif 272 2c1f4f12SMasahiro Yamadaendif 273 2c1f4f12SMasahiro Yamada 274 d7942413SMasahiro Yamadaifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 275 d7942413SMasahiro Yamada ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 276 2042b548SMasahiro Yamada may-sync-config := 277 d7942413SMasahiro Yamada endif 278 d7942413SMasahiro Yamadaendif 279 d7942413SMasahiro Yamada 280 d7942413SMasahiro Yamadaifneq ($(KBUILD_EXTMOD),) 281 2042b548SMasahiro Yamada may-sync-config := 282 d7942413SMasahiro Yamadaendif 283 d7942413SMasahiro Yamada 284 2c1f4f12SMasahiro Yamadaifeq ($(KBUILD_EXTMOD),) 285 2c1f4f12SMasahiro Yamada ifneq ($(filter config %config,$(MAKECMDGOALS)),) 286 2042b548SMasahiro Yamada config-build := 1 287 2c1f4f12SMasahiro Yamada ifneq ($(words $(MAKECMDGOALS)),1) 288 2042b548SMasahiro Yamada mixed-build := 1 289 2c1f4f12SMasahiro Yamada endif 290 2c1f4f12SMasahiro Yamada endif 291 2c1f4f12SMasahiro Yamadaendif 292 22340a06SMasahiro Yamada 293 394053f4SMasahiro Yamada# We cannot build single targets and the others at the same time 294 394053f4SMasahiro Yamadaifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 295 394053f4SMasahiro Yamada single-build := 1 296 394053f4SMasahiro Yamada ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 297 394053f4SMasahiro Yamada mixed-build := 1 298 394053f4SMasahiro Yamada endif 299 394053f4SMasahiro Yamadaendif 300 394053f4SMasahiro Yamada 301 22340a06SMasahiro Yamada# For "make -j clean all", "make -j mrproper defconfig all", etc. 302 22340a06SMasahiro Yamadaifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 303 22340a06SMasahiro Yamada ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 304 2042b548SMasahiro Yamada mixed-build := 1 305 22340a06SMasahiro Yamada endif 306 22340a06SMasahiro Yamadaendif 307 22340a06SMasahiro Yamada 308 2c1f4f12SMasahiro Yamada# install and modules_install need also be processed one by one 309 2c1f4f12SMasahiro Yamadaifneq ($(filter install,$(MAKECMDGOALS)),) 310 2c1f4f12SMasahiro Yamada ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 311 2042b548SMasahiro Yamada mixed-build := 1 312 2c1f4f12SMasahiro Yamada endif 313 2c1f4f12SMasahiro Yamadaendif 314 2c1f4f12SMasahiro Yamada 315 2042b548SMasahiro Yamadaifdef mixed-build 316 2c1f4f12SMasahiro Yamada# =========================================================================== 317 2c1f4f12SMasahiro Yamada# We're called with mixed targets (*config and build targets). 318 2c1f4f12SMasahiro Yamada# Handle them one by one. 319 2c1f4f12SMasahiro Yamada 320 2c1f4f12SMasahiro YamadaPHONY += $(MAKECMDGOALS) __build_one_by_one 321 2c1f4f12SMasahiro Yamada 322 2c1f4f12SMasahiro Yamada$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 323 2c1f4f12SMasahiro Yamada @: 324 2c1f4f12SMasahiro Yamada 325 2c1f4f12SMasahiro Yamada__build_one_by_one: 326 2c1f4f12SMasahiro Yamada $(Q)set -e; \ 327 2c1f4f12SMasahiro Yamada for i in $(MAKECMDGOALS); do \ 328 2c1f4f12SMasahiro Yamada $(MAKE) -f $(srctree)/Makefile $$i; \ 329 2c1f4f12SMasahiro Yamada done 330 2c1f4f12SMasahiro Yamada 331 2042b548SMasahiro Yamadaelse # !mixed-build 332 2c1f4f12SMasahiro Yamada 333 2c1f4f12SMasahiro Yamadainclude scripts/Kbuild.include 334 2c1f4f12SMasahiro Yamada 335 2c1f4f12SMasahiro Yamada# Read KERNELRELEASE from include/config/kernel.release (if it exists) 336 2c1f4f12SMasahiro YamadaKERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 337 2c1f4f12SMasahiro YamadaKERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 338 2c1f4f12SMasahiro Yamadaexport VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 339 2c1f4f12SMasahiro Yamada 340 b2d35fa5SAnders Roxellinclude scripts/subarch.include 341 1da177e4SLinus Torvalds 342 1da177e4SLinus Torvalds# Cross compiling and selecting different set of gcc/bin-utils 343 1da177e4SLinus Torvalds# --------------------------------------------------------------------------- 344 1da177e4SLinus Torvalds# 345 1da177e4SLinus Torvalds# When performing cross compilation for other architectures ARCH shall be set 346 1da177e4SLinus Torvalds# to the target architecture. (See arch/* for the possibilities). 347 1da177e4SLinus Torvalds# ARCH can be set during invocation of make: 348 1da177e4SLinus Torvalds# make ARCH=ia64 349 1da177e4SLinus Torvalds# Another way is to have ARCH set in the environment. 350 1da177e4SLinus Torvalds# The default ARCH is the host where make is executed. 351 1da177e4SLinus Torvalds 352 1da177e4SLinus Torvalds# CROSS_COMPILE specify the prefix used for all executables used 353 1da177e4SLinus Torvalds# during compilation. Only gcc and related bin-utils executables 354 1da177e4SLinus Torvalds# are prefixed with $(CROSS_COMPILE). 355 1da177e4SLinus Torvalds# CROSS_COMPILE can be set on the command line 356 1da177e4SLinus Torvalds# make CROSS_COMPILE=ia64-linux- 357 1da177e4SLinus Torvalds# Alternatively CROSS_COMPILE can be set in the environment. 358 1da177e4SLinus Torvalds# Default value for CROSS_COMPILE is not to prefix executables 359 1da177e4SLinus Torvalds# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 360 2331d1a6SSam RavnborgARCH ?= $(SUBARCH) 361 1da177e4SLinus Torvalds 362 1da177e4SLinus Torvalds# Architecture as present in compile.h 363 1da177e4SLinus TorvaldsUTS_MACHINE := $(ARCH) 364 6752ed90SThomas GleixnerSRCARCH := $(ARCH) 365 1da177e4SLinus Torvalds 366 d746d647SSam Ravnborg# Additional ARCH settings for x86 367 d746d647SSam Ravnborgifeq ($(ARCH),i386) 368 d746d647SSam Ravnborg SRCARCH := x86 369 d746d647SSam Ravnborgendif 370 d746d647SSam Ravnborgifeq ($(ARCH),x86_64) 371 d746d647SSam Ravnborg SRCARCH := x86 372 d746d647SSam Ravnborgendif 373 74b469f2SSam Ravnborg 374 5e538790SSam Ravnborg# Additional ARCH settings for sparc 375 e69f58c0SNamhyung Kimifeq ($(ARCH),sparc32) 376 e69f58c0SNamhyung Kim SRCARCH := sparc 377 e69f58c0SNamhyung Kimendif 378 a439fe51SSam Ravnborgifeq ($(ARCH),sparc64) 379 5e538790SSam Ravnborg SRCARCH := sparc 380 a439fe51SSam Ravnborgendif 381 2fb9b1bdSSam Ravnborg 382 3cc000b5SPaul Mundt# Additional ARCH settings for sh 383 3cc000b5SPaul Mundtifeq ($(ARCH),sh64) 384 3cc000b5SPaul Mundt SRCARCH := sh 385 3cc000b5SPaul Mundtendif 386 3cc000b5SPaul Mundt 387 14cdd3c4SRoman ZippelKCONFIG_CONFIG ?= .config 388 41263fc6SBen Gardinerexport KCONFIG_CONFIG 389 14cdd3c4SRoman Zippel 390 1da177e4SLinus Torvalds# SHELL used by kbuild 391 858805b3SMasahiro YamadaCONFIG_SHELL := sh 392 1da177e4SLinus Torvalds 393 6d79a7b4SMasahiro YamadaHOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 394 6d79a7b4SMasahiro YamadaHOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 395 6d79a7b4SMasahiro YamadaHOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 396 d7f14c66SUwe Kleine-König 397 1da177e4SLinus TorvaldsHOSTCC = gcc 398 1da177e4SLinus TorvaldsHOSTCXX = g++ 399 96f14fe7SLaura AbbottKBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \ 400 f92d19e0SLaura Abbott -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \ 401 f92d19e0SLaura Abbott $(HOSTCFLAGS) 402 f92d19e0SLaura AbbottKBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 403 f92d19e0SLaura AbbottKBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 404 f92d19e0SLaura AbbottKBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 405 1da177e4SLinus Torvalds 406 1da177e4SLinus Torvalds# Make variables (CC, etc...) 407 1da177e4SLinus TorvaldsAS = $(CROSS_COMPILE)as 408 1da177e4SLinus TorvaldsLD = $(CROSS_COMPILE)ld 409 1da177e4SLinus TorvaldsCC = $(CROSS_COMPILE)gcc 410 1da177e4SLinus TorvaldsCPP = $(CC) -E 411 1da177e4SLinus TorvaldsAR = $(CROSS_COMPILE)ar 412 1da177e4SLinus TorvaldsNM = $(CROSS_COMPILE)nm 413 1da177e4SLinus TorvaldsSTRIP = $(CROSS_COMPILE)strip 414 1da177e4SLinus TorvaldsOBJCOPY = $(CROSS_COMPILE)objcopy 415 1da177e4SLinus TorvaldsOBJDUMP = $(CROSS_COMPILE)objdump 416 7bac9870SVasily GorbikOBJSIZE = $(CROSS_COMPILE)size 417 e83b9f55SAndrii NakryikoPAHOLE = pahole 418 73a4f6dbSMasahiro YamadaLEX = flex 419 73a4f6dbSMasahiro YamadaYACC = bison 420 1da177e4SLinus TorvaldsAWK = awk 421 caa27b66SSam RavnborgINSTALLKERNEL := installkernel 422 1da177e4SLinus TorvaldsDEPMOD = /sbin/depmod 423 1da177e4SLinus TorvaldsPERL = perl 424 011bf125SMasahiro YamadaPYTHON = python 425 e9781b52SMasahiro YamadaPYTHON2 = python2 426 e9781b52SMasahiro YamadaPYTHON3 = python3 427 1da177e4SLinus TorvaldsCHECK = sparse 428 858805b3SMasahiro YamadaBASH = bash 429 1da177e4SLinus Torvalds 430 80a7d1d9SHannes EderCHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 431 6c49f359SLuc Van Oostenryck -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 432 0c22be07SDouglas AndersonNOSTDINC_FLAGS := 433 6588169dSSam RavnborgCFLAGS_MODULE = 434 6588169dSSam RavnborgAFLAGS_MODULE = 435 6588169dSSam RavnborgLDFLAGS_MODULE = 436 1da177e4SLinus TorvaldsCFLAGS_KERNEL = 437 1da177e4SLinus TorvaldsAFLAGS_KERNEL = 438 b36fad65SMichal MarekLDFLAGS_vmlinux = 439 1da177e4SLinus Torvalds 440 abbf1590SDavid Howells# Use USERINCLUDE when you must reference the UAPI directories only. 441 abbf1590SDavid HowellsUSERINCLUDE := \ 442 9d022c54SMasahiro Yamada -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 443 9d022c54SMasahiro Yamada -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 444 abbf1590SDavid Howells -I$(srctree)/include/uapi \ 445 3308b285SArnd Bergmann -I$(objtree)/include/generated/uapi \ 446 abbf1590SDavid Howells -include $(srctree)/include/linux/kconfig.h 447 abbf1590SDavid Howells 448 1da177e4SLinus Torvalds# Use LINUXINCLUDE when you must reference the include/ directory. 449 1da177e4SLinus Torvalds# Needed to be compatible with the O= option 450 abbf1590SDavid HowellsLINUXINCLUDE := \ 451 9d022c54SMasahiro Yamada -I$(srctree)/arch/$(SRCARCH)/include \ 452 9d022c54SMasahiro Yamada -I$(objtree)/arch/$(SRCARCH)/include/generated \ 453 051f278eSMasahiro Yamada $(if $(building_out_of_srctree),-I$(srctree)/include) \ 454 f8224f7fSMasahiro Yamada -I$(objtree)/include \ 455 f8224f7fSMasahiro Yamada $(USERINCLUDE) 456 1da177e4SLinus Torvalds 457 42a92bccSMasahiro YamadaKBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 458 eeb5687aSMasahiro YamadaKBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 459 42a92bccSMasahiro Yamada -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 460 b89f25eaSLuc Van Oostenryck -Werror=implicit-function-declaration -Werror=implicit-int \ 461 51b97e35SKirill A. Shutemov -Wno-format-security \ 462 433dc2ebSMasahiro Yamada -std=gnu89 463 433dc2ebSMasahiro YamadaKBUILD_CPPFLAGS := -D__KERNEL__ 464 80c00ba9SSam RavnborgKBUILD_AFLAGS_KERNEL := 465 80c00ba9SSam RavnborgKBUILD_CFLAGS_KERNEL := 466 6588169dSSam RavnborgKBUILD_AFLAGS_MODULE := -DMODULE 467 6588169dSSam RavnborgKBUILD_CFLAGS_MODULE := -DMODULE 468 10df0638SMasahiro YamadaKBUILD_LDFLAGS_MODULE := 469 10df0638SMasahiro Yamadaexport KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds 470 d503ac53SMasahiro YamadaKBUILD_LDFLAGS := 471 433dc2ebSMasahiro YamadaGCC_PLUGINS_CFLAGS := 472 5241ab4cSMasahiro YamadaCLANG_FLAGS := 473 1da177e4SLinus Torvalds 474 858805b3SMasahiro Yamadaexport ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC 475 7bac9870SVasily Gorbikexport CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE PAHOLE LEX YACC AWK INSTALLKERNEL 476 7bac9870SVasily Gorbikexport PERL PYTHON PYTHON2 PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 477 7bac9870SVasily Gorbikexport KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 478 1da177e4SLinus Torvalds 479 d503ac53SMasahiro Yamadaexport KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 480 0e410e15SAndrey Konovalovexport KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 481 0e410e15SAndrey Konovalovexport CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN 482 222d394dSSam Ravnborgexport KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 483 6588169dSSam Ravnborgexport KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 484 80c00ba9SSam Ravnborgexport KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 485 1da177e4SLinus Torvalds 486 1da177e4SLinus Torvalds# Files to ignore in find ... statements 487 1da177e4SLinus Torvalds 488 ae63b2d7SPrarit Bhargavaexport RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 489 ae63b2d7SPrarit Bhargava -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 490 ae63b2d7SPrarit Bhargava -prune -o 491 450c6076SJesper Juhlexport RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 492 450c6076SJesper Juhl --exclude CVS --exclude .pc --exclude .hg --exclude .git 493 1da177e4SLinus Torvalds 494 1da177e4SLinus Torvalds# =========================================================================== 495 1da177e4SLinus Torvalds# Rules shared between *config targets and build targets 496 1da177e4SLinus Torvalds 497 312a3d09SCao jin# Basic helpers built in scripts/basic/ 498 4f193362SPaul SmithPHONY += scripts_basic 499 1da177e4SLinus Torvaldsscripts_basic: 500 1da177e4SLinus Torvalds $(Q)$(MAKE) $(build)=scripts/basic 501 638adb05SSteven Rostedt $(Q)rm -f .tmp_quiet_recordmcount 502 1da177e4SLinus Torvalds 503 4f193362SPaul SmithPHONY += outputmakefile 504 e8e83a23SMasahiro Yamada# Before starting out-of-tree build, make sure the source tree is clean. 505 fd5f0cd6SJan Beulich# outputmakefile generates a Makefile in the output directory, if using a 506 fd5f0cd6SJan Beulich# separate output directory. This allows convenient use of make in the 507 fd5f0cd6SJan Beulich# output directory. 508 3a51ff34SVladimir Kondratiev# At the same time when output Makefile generated, generate .gitignore to 509 3a51ff34SVladimir Kondratiev# ignore whole output directory 510 1da177e4SLinus Torvaldsoutputmakefile: 511 051f278eSMasahiro Yamadaifdef building_out_of_srctree 512 e8e83a23SMasahiro Yamada $(Q)if [ -f $(srctree)/.config -o \ 513 e8e83a23SMasahiro Yamada -d $(srctree)/include/config -o \ 514 e8e83a23SMasahiro Yamada -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 515 e8e83a23SMasahiro Yamada echo >&2 "***"; \ 516 e8e83a23SMasahiro Yamada echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 517 e8e83a23SMasahiro Yamada echo >&2 "*** in $(abs_srctree)";\ 518 e8e83a23SMasahiro Yamada echo >&2 "***"; \ 519 e8e83a23SMasahiro Yamada false; \ 520 e8e83a23SMasahiro Yamada fi 521 92979997SAndi Kleen $(Q)ln -fsn $(srctree) source 522 4fd61277SMasahiro Yamada $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 523 156e7cbbSMasahiro Yamada $(Q)test -e .gitignore || \ 524 156e7cbbSMasahiro Yamada { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 525 fd5f0cd6SJan Beulichendif 526 1da177e4SLinus Torvalds 527 99516742SMasahiro Yamadaifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),) 528 ae6b289aSChris Friesifneq ($(CROSS_COMPILE),) 529 5241ab4cSMasahiro YamadaCLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) 530 ad15006cSNick DesaulniersGCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 531 238bcbc4SMasahiro YamadaCLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR) 532 ef8c4ed9SStefan AgnerGCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) 533 ae6b289aSChris Friesendif 534 ae6b289aSChris Friesifneq ($(GCC_TOOLCHAIN),) 535 238bcbc4SMasahiro YamadaCLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) 536 ae6b289aSChris Friesendif 537 876a0600SNathan Chancellorifeq ($(shell $(AS) --version 2>&1 | head -n 1 | grep clang),) 538 238bcbc4SMasahiro YamadaCLANG_FLAGS += -no-integrated-as 539 876a0600SNathan Chancellorendif 540 589834b3SNathan ChancellorCLANG_FLAGS += -Werror=unknown-warning-option 541 238bcbc4SMasahiro YamadaKBUILD_CFLAGS += $(CLANG_FLAGS) 542 238bcbc4SMasahiro YamadaKBUILD_AFLAGS += $(CLANG_FLAGS) 543 3bd98050SJoel Stanleyexport CLANG_FLAGS 544 ae6b289aSChris Friesendif 545 ae6b289aSChris Fries 546 315bab4eSMasahiro Yamada# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 547 315bab4eSMasahiro Yamada# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 548 315bab4eSMasahiro Yamada# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 549 315bab4eSMasahiro Yamada# and from include/config/auto.conf.cmd to detect the compiler upgrade. 550 902a6898SMasahiro YamadaCC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1) 551 315bab4eSMasahiro Yamada 552 2042b548SMasahiro Yamadaifdef config-build 553 1da177e4SLinus Torvalds# =========================================================================== 554 1da177e4SLinus Torvalds# *config targets only - make sure prerequisites are updated, and descend 555 1da177e4SLinus Torvalds# in scripts/kconfig to make the *config target 556 1da177e4SLinus Torvalds 557 1da177e4SLinus Torvalds# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 558 1da177e4SLinus Torvalds# KBUILD_DEFCONFIG may point out an alternative default configuration 559 1da177e4SLinus Torvalds# used for 'make defconfig' 560 a436bb7bSMasahiro Yamadainclude arch/$(SRCARCH)/Makefile 561 315bab4eSMasahiro Yamadaexport KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 562 1da177e4SLinus Torvalds 563 36de077bSMasahiro Yamadaconfig: outputmakefile scripts_basic FORCE 564 31110ebbSSam Ravnborg $(Q)$(MAKE) $(build)=scripts/kconfig $@ 565 31110ebbSSam Ravnborg 566 36de077bSMasahiro Yamada%config: outputmakefile scripts_basic FORCE 567 1da177e4SLinus Torvalds $(Q)$(MAKE) $(build)=scripts/kconfig $@ 568 1da177e4SLinus Torvalds 569 2042b548SMasahiro Yamadaelse #!config-build 570 1da177e4SLinus Torvalds# =========================================================================== 571 1da177e4SLinus Torvalds# Build targets only - this includes vmlinux, arch specific targets, clean 572 1da177e4SLinus Torvalds# targets and others. In general all targets except *config targets. 573 1da177e4SLinus Torvalds 574 2c1f4f12SMasahiro Yamada# If building an external module we do not care about the all: rule 575 2c1f4f12SMasahiro Yamada# but instead _all depend on modules 576 2c1f4f12SMasahiro YamadaPHONY += all 577 2c1f4f12SMasahiro Yamadaifeq ($(KBUILD_EXTMOD),) 578 2c1f4f12SMasahiro Yamada_all: all 579 2c1f4f12SMasahiro Yamadaelse 580 2c1f4f12SMasahiro Yamada_all: modules 581 2c1f4f12SMasahiro Yamadaendif 582 2c1f4f12SMasahiro Yamada 583 2c1f4f12SMasahiro Yamada# Decide whether to build built-in, modular, or both. 584 2c1f4f12SMasahiro Yamada# Normally, just do built-in. 585 2c1f4f12SMasahiro Yamada 586 2c1f4f12SMasahiro YamadaKBUILD_MODULES := 587 2c1f4f12SMasahiro YamadaKBUILD_BUILTIN := 1 588 2c1f4f12SMasahiro Yamada 589 2c1f4f12SMasahiro Yamada# If we have only "make modules", don't compile built-in objects. 590 2c1f4f12SMasahiro Yamada# When we're building modules with modversions, we need to consider 591 2c1f4f12SMasahiro Yamada# the built-in objects during the descend as well, in order to 592 2c1f4f12SMasahiro Yamada# make sure the checksums are up to date before we record them. 593 2c1f4f12SMasahiro Yamada 594 2c1f4f12SMasahiro Yamadaifeq ($(MAKECMDGOALS),modules) 595 2c1f4f12SMasahiro Yamada KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 596 2c1f4f12SMasahiro Yamadaendif 597 2c1f4f12SMasahiro Yamada 598 2c1f4f12SMasahiro Yamada# If we have "make <whatever> modules", compile modules 599 2c1f4f12SMasahiro Yamada# in addition to whatever we do anyway. 600 2c1f4f12SMasahiro Yamada# Just "make" or "make all" shall build modules as well 601 2c1f4f12SMasahiro Yamada 602 d85103acSMasahiro Yamadaifneq ($(filter all _all modules nsdeps,$(MAKECMDGOALS)),) 603 2c1f4f12SMasahiro Yamada KBUILD_MODULES := 1 604 2c1f4f12SMasahiro Yamadaendif 605 2c1f4f12SMasahiro Yamada 606 2c1f4f12SMasahiro Yamadaifeq ($(MAKECMDGOALS),) 607 2c1f4f12SMasahiro Yamada KBUILD_MODULES := 1 608 2c1f4f12SMasahiro Yamadaendif 609 2c1f4f12SMasahiro Yamada 610 2c1f4f12SMasahiro Yamadaexport KBUILD_MODULES KBUILD_BUILTIN 611 2c1f4f12SMasahiro Yamada 612 2042b548SMasahiro Yamadaifdef need-config 613 d93a18f2SMasahiro Yamadainclude include/config/auto.conf 614 d93a18f2SMasahiro Yamadaendif 615 d93a18f2SMasahiro Yamada 616 1da177e4SLinus Torvaldsifeq ($(KBUILD_EXTMOD),) 617 1da177e4SLinus Torvalds# Objects we will link into vmlinux / subdirs we need to visit 618 1da177e4SLinus Torvaldsinit-y := init/ 619 f96182e9SMasahiro Yamadadrivers-y := drivers/ sound/ 620 d93a18f2SMasahiro Yamadadrivers-$(CONFIG_SAMPLES) += samples/ 621 43c78d88SMasahiro Yamadadrivers-$(CONFIG_KERNEL_HEADER_TEST) += include/ 622 1da177e4SLinus Torvaldsnet-y := net/ 623 1da177e4SLinus Torvaldslibs-y := lib/ 624 1da177e4SLinus Torvaldscore-y := usr/ 625 37d9fe47SFeng Wuvirt-y := virt/ 626 1da177e4SLinus Torvaldsendif # KBUILD_EXTMOD 627 1da177e4SLinus Torvalds 628 315bab4eSMasahiro Yamada# The all: target is the default when no target is given on the 629 315bab4eSMasahiro Yamada# command line. 630 315bab4eSMasahiro Yamada# This allow a user to issue only 'make' to build a kernel including modules 631 315bab4eSMasahiro Yamada# Defaults to vmlinux, but the arch makefile usually adds further targets 632 315bab4eSMasahiro Yamadaall: vmlinux 633 315bab4eSMasahiro Yamada 634 315bab4eSMasahiro YamadaCFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 635 315bab4eSMasahiro Yamada $(call cc-option,-fno-tree-loop-im) \ 636 315bab4eSMasahiro Yamada $(call cc-disable-warning,maybe-uninitialized,) 637 5aadfdebSMasahiro Yamadaexport CFLAGS_GCOV 638 315bab4eSMasahiro Yamada 639 b1f4ff74SPaulo Zanoni# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 640 b1f4ff74SPaulo Zanoniifdef CONFIG_FUNCTION_TRACER 641 b1f4ff74SPaulo Zanoni CC_FLAGS_FTRACE := -pg 642 b1f4ff74SPaulo Zanoniendif 643 b1f4ff74SPaulo Zanoni 644 669e06b1SMasahiro YamadaRETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 645 669e06b1SMasahiro YamadaRETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 646 669e06b1SMasahiro YamadaRETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 647 669e06b1SMasahiro YamadaRETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 648 669e06b1SMasahiro YamadaRETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 649 669e06b1SMasahiro YamadaRETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 650 669e06b1SMasahiro Yamadaexport RETPOLINE_CFLAGS 651 669e06b1SMasahiro Yamadaexport RETPOLINE_VDSO_CFLAGS 652 669e06b1SMasahiro Yamada 653 315bab4eSMasahiro Yamadainclude arch/$(SRCARCH)/Makefile 654 315bab4eSMasahiro Yamada 655 2042b548SMasahiro Yamadaifdef need-config 656 2042b548SMasahiro Yamadaifdef may-sync-config 657 315bab4eSMasahiro Yamada# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 658 315bab4eSMasahiro Yamada# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 659 315bab4eSMasahiro Yamada# because some architectures define CROSS_COMPILE there. 660 d2f8ae0eSMasahiro Yamadainclude include/config/auto.conf.cmd 661 1da177e4SLinus Torvalds 662 05850719SMasahiro Yamada$(KCONFIG_CONFIG): 663 05850719SMasahiro Yamada @echo >&2 '***' 664 05850719SMasahiro Yamada @echo >&2 '*** Configuration file "$@" not found!' 665 05850719SMasahiro Yamada @echo >&2 '***' 666 05850719SMasahiro Yamada @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 667 05850719SMasahiro Yamada @echo >&2 '*** "make menuconfig" or "make xconfig").' 668 05850719SMasahiro Yamada @echo >&2 '***' 669 05850719SMasahiro Yamada @/bin/false 670 1da177e4SLinus Torvalds 671 61277981SUlf Magnusson# The actual configuration files used during the build are stored in 672 61277981SUlf Magnusson# include/generated/ and include/config/. Update them if .config is newer than 673 61277981SUlf Magnusson# include/config/auto.conf (which mirrors .config). 674 9390dff6SMasahiro Yamada# 675 9390dff6SMasahiro Yamada# This exploits the 'multi-target pattern rule' trick. 676 9390dff6SMasahiro Yamada# The syncconfig should be executed only once to make all the targets. 677 9390dff6SMasahiro Yamada%/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG) 678 911a91c3SMasahiro Yamada $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 679 2042b548SMasahiro Yamadaelse # !may-sync-config 680 d7942413SMasahiro Yamada# External modules and some install targets need include/generated/autoconf.h 681 d7942413SMasahiro Yamada# and include/config/auto.conf but do not care if they are up-to-date. 682 d7942413SMasahiro Yamada# Use auto.conf to trigger the test 683 9ee4e336SSam RavnborgPHONY += include/config/auto.conf 684 9ee4e336SSam Ravnborg 685 9ee4e336SSam Ravnborginclude/config/auto.conf: 686 264a2683SSam Ravnborg $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 687 5369f550SMichal Marek echo >&2; \ 688 5369f550SMichal Marek echo >&2 " ERROR: Kernel configuration is invalid."; \ 689 5369f550SMichal Marek echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 690 5369f550SMichal Marek echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 691 5369f550SMichal Marek echo >&2 ; \ 692 9ee4e336SSam Ravnborg /bin/false) 693 9ee4e336SSam Ravnborg 694 d7942413SMasahiro Yamadaendif # may-sync-config 695 2042b548SMasahiro Yamadaendif # need-config 696 1da177e4SLinus Torvalds 697 a1c48bb1SGeert UytterhoevenKBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 698 ef6000b4SLinus TorvaldsKBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 699 bd664f6bSLinus TorvaldsKBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 700 bd664f6bSLinus TorvaldsKBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 701 6f303d60SLinus TorvaldsKBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 702 a1c48bb1SGeert Uytterhoeven 703 15f5db60SMasahiro Yamadaifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 704 a0f97e06SSam RavnborgKBUILD_CFLAGS += -O2 705 15f5db60SMasahiro Yamadaelse ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 706 15f5db60SMasahiro YamadaKBUILD_CFLAGS += -O3 707 15f5db60SMasahiro Yamadaelse ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 708 15f5db60SMasahiro YamadaKBUILD_CFLAGS += -Os 709 1da177e4SLinus Torvaldsendif 710 1da177e4SLinus Torvalds 711 b303c6dfSMasahiro Yamadaifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED 712 b303c6dfSMasahiro YamadaKBUILD_CFLAGS += -Wno-maybe-uninitialized 713 b303c6dfSMasahiro Yamadaendif 714 a76bcf55SArnd Bergmann 715 69102311SJiri Kosina# Tell gcc to never replace conditional load with a non-conditional one 716 69102311SJiri KosinaKBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 717 69102311SJiri Kosina 718 d677a4d6SVictor Chibotaruinclude scripts/Makefile.kcov 719 6b90bd4bSEmese Revfyinclude scripts/Makefile.gcc-plugins 720 6b90bd4bSEmese Revfy 721 1873e870SAndi Kleenifdef CONFIG_READABLE_ASM 722 1873e870SAndi Kleen# Disable optimizations that make assembler listings hard to read. 723 1873e870SAndi Kleen# reorder blocks reorders the control in the function 724 1873e870SAndi Kleen# ipa clone creates specialized cloned functions 725 1873e870SAndi Kleen# partial inlining inlines only parts of functions 726 1873e870SAndi KleenKBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 727 1873e870SAndi Kleen $(call cc-option,-fno-ipa-cp-clone,) \ 728 1873e870SAndi Kleen $(call cc-option,-fno-partial-inlining) 729 1873e870SAndi Kleenendif 730 1873e870SAndi Kleen 731 08f67461SMike Frysingerifneq ($(CONFIG_FRAME_WARN),0) 732 35bb5b1eSAndi KleenKBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 733 35bb5b1eSAndi Kleenendif 734 35bb5b1eSAndi Kleen 735 2a61f474SMasahiro Yamadastackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector 736 050e9baaSLinus Torvaldsstackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 737 050e9baaSLinus Torvaldsstackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 738 2a61f474SMasahiro Yamada 739 2a61f474SMasahiro YamadaKBUILD_CFLAGS += $(stackp-flags-y) 740 e06b8b98SSam Ravnborg 741 076f421dSMasahiro Yamadaifdef CONFIG_CC_IS_CLANG 742 a1494304SMasahiro YamadaKBUILD_CPPFLAGS += -Qunused-arguments 743 a1494304SMasahiro YamadaKBUILD_CFLAGS += -Wno-format-invalid-specifier 744 a1494304SMasahiro YamadaKBUILD_CFLAGS += -Wno-gnu 745 cfe17c9bSMasahiro Yamada# Quiet clang warning: comparison of unsigned expression < 0 is always false 746 a1494304SMasahiro YamadaKBUILD_CFLAGS += -Wno-tautological-compare 747 cfe17c9bSMasahiro Yamada# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 748 cfe17c9bSMasahiro Yamada# source of a reference will be _MergedGlobals and not on of the whitelisted names. 749 cfe17c9bSMasahiro Yamada# See modpost pattern 2 750 a1494304SMasahiro YamadaKBUILD_CFLAGS += -mno-global-merge 751 cfe17c9bSMasahiro Yamadaelse 752 cfe17c9bSMasahiro Yamada 753 cfe17c9bSMasahiro Yamada# These warnings generated too much noise in a regular build. 754 cfe17c9bSMasahiro Yamada# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 755 9df3e7a7SMasahiro YamadaKBUILD_CFLAGS += -Wno-unused-but-set-variable 756 e2079e93SNathan Chancellor 757 e2079e93SNathan Chancellor# Warn about unmarked fall-throughs in switch statement. 758 e2079e93SNathan Chancellor# Disabled for clang while comment to attribute conversion happens and 759 e2079e93SNathan Chancellor# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed. 760 e2079e93SNathan ChancellorKBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,) 761 cfe17c9bSMasahiro Yamadaendif 762 cfe17c9bSMasahiro Yamada 763 0a5f4176SSodagudi PrasadKBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 764 1da177e4SLinus Torvaldsifdef CONFIG_FRAME_POINTER 765 a0f97e06SSam RavnborgKBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 766 1da177e4SLinus Torvaldselse 767 7e9501fdSRabin Vincent# Some targets (ARM with Thumb2, for example), can't be built with frame 768 7e9501fdSRabin Vincent# pointers. For those, we don't have FUNCTION_TRACER automatically 769 7e9501fdSRabin Vincent# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 770 7e9501fdSRabin Vincent# incompatible with -fomit-frame-pointer with current GCC, so we don't use 771 7e9501fdSRabin Vincent# -fomit-frame-pointer with FUNCTION_TRACER. 772 7e9501fdSRabin Vincentifndef CONFIG_FUNCTION_TRACER 773 a0f97e06SSam RavnborgKBUILD_CFLAGS += -fomit-frame-pointer 774 1da177e4SLinus Torvaldsendif 775 7e9501fdSRabin Vincentendif 776 1da177e4SLinus Torvalds 777 709a972eSKees Cook# Initialize all stack variables with a pattern, if desired. 778 709a972eSKees Cookifdef CONFIG_INIT_STACK_ALL 779 709a972eSKees CookKBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 780 709a972eSKees Cookendif 781 709a972eSKees Cook 782 1e88e415SMasahiro YamadaDEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments) 783 2062afb4SLinus Torvalds 784 1da177e4SLinus Torvaldsifdef CONFIG_DEBUG_INFO 785 866ced95SAndi Kleenifdef CONFIG_DEBUG_INFO_SPLIT 786 9d937444SMasahiro YamadaDEBUG_CFLAGS += -gsplit-dwarf 787 866ced95SAndi Kleenelse 788 1e88e415SMasahiro YamadaDEBUG_CFLAGS += -g 789 866ced95SAndi Kleenendif 790 2288328cSBehan WebsterKBUILD_AFLAGS += -Wa,-gdwarf-2 791 1da177e4SLinus Torvaldsendif 792 bfaf2dd3SAndi Kleenifdef CONFIG_DEBUG_INFO_DWARF4 793 9d937444SMasahiro YamadaDEBUG_CFLAGS += -gdwarf-4 794 bfaf2dd3SAndi Kleenendif 795 1da177e4SLinus Torvalds 796 d6f4ceb7SAndi Kleenifdef CONFIG_DEBUG_INFO_REDUCED 797 1e88e415SMasahiro YamadaDEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 798 e82c4bb8SAndi Kleen $(call cc-option,-fno-var-tracking) 799 d6f4ceb7SAndi Kleenendif 800 d6f4ceb7SAndi Kleen 801 1e88e415SMasahiro YamadaKBUILD_CFLAGS += $(DEBUG_CFLAGS) 802 1e88e415SMasahiro Yamadaexport DEBUG_CFLAGS 803 1e88e415SMasahiro Yamada 804 606576ceSSteven Rostedtifdef CONFIG_FUNCTION_TRACER 805 07d04081SVasily Gorbikifdef CONFIG_FTRACE_MCOUNT_RECORD 806 07d04081SVasily Gorbik # gcc 5 supports generating the mcount tables directly 807 07d04081SVasily Gorbik ifeq ($(call cc-option-yn,-mrecord-mcount),y) 808 07d04081SVasily Gorbik CC_FLAGS_FTRACE += -mrecord-mcount 809 07d04081SVasily Gorbik export CC_USING_RECORD_MCOUNT := 1 810 a2546faeSSteven Rostedt endif 811 2f4df001SVasily Gorbik ifdef CONFIG_HAVE_NOP_MCOUNT 812 2f4df001SVasily Gorbik ifeq ($(call cc-option-yn, -mnop-mcount),y) 813 2f4df001SVasily Gorbik CC_FLAGS_FTRACE += -mnop-mcount 814 2f4df001SVasily Gorbik CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 815 2f4df001SVasily Gorbik endif 816 2f4df001SVasily Gorbik endif 817 07d04081SVasily Gorbikendif 818 a2546faeSSteven Rostedtifdef CONFIG_HAVE_FENTRY 819 f28bc3c3SVasily Gorbik ifeq ($(call cc-option-yn, -mfentry),y) 820 f28bc3c3SVasily Gorbik CC_FLAGS_FTRACE += -mfentry 821 f28bc3c3SVasily Gorbik CC_FLAGS_USING += -DCC_USING_FENTRY 822 a2546faeSSteven Rostedt endif 823 f28bc3c3SVasily Gorbikendif 824 f28bc3c3SVasily Gorbikexport CC_FLAGS_FTRACE 825 f28bc3c3SVasily GorbikKBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 826 f28bc3c3SVasily GorbikKBUILD_AFLAGS += $(CC_FLAGS_USING) 827 72441cb1SSteven Rostedtifdef CONFIG_DYNAMIC_FTRACE 828 cf4db259SSteven Rostedt ifdef CONFIG_HAVE_C_RECORDMCOUNT 829 72441cb1SSteven Rostedt BUILD_C_RECORDMCOUNT := y 830 72441cb1SSteven Rostedt export BUILD_C_RECORDMCOUNT 831 72441cb1SSteven Rostedt endif 832 72441cb1SSteven Rostedtendif 833 16444a8aSArnaldo Carvalho de Meloendif 834 16444a8aSArnaldo Carvalho de Melo 835 91341d4bSSam Ravnborg# We trigger additional mismatches with less inlining 836 91341d4bSSam Ravnborgifdef CONFIG_DEBUG_SECTION_MISMATCH 837 91341d4bSSam RavnborgKBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 838 91341d4bSSam Ravnborgendif 839 91341d4bSSam Ravnborg 840 90ad4052SMasahiro Yamadaifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 841 e85d1d65SMasahiro YamadaKBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 842 e85d1d65SMasahiro YamadaLDFLAGS_vmlinux += --gc-sections 843 90ad4052SMasahiro Yamadaendif 844 90ad4052SMasahiro Yamada 845 43bd3a95SMiroslav Benesifdef CONFIG_LIVEPATCH 846 43bd3a95SMiroslav BenesKBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone) 847 43bd3a95SMiroslav Benesendif 848 43bd3a95SMiroslav Benes 849 e8e69931SSam Ravnborg# arch Makefile may override CC so keep this after arch Makefile is included 850 e08d6de4SMasahiro YamadaNOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 851 e8e69931SSam Ravnborg 852 1da177e4SLinus Torvalds# warn about C99 declaration after statement 853 a33e7ae2SMasahiro YamadaKBUILD_CFLAGS += -Wdeclaration-after-statement 854 1da177e4SLinus Torvalds 855 0bb95f80SKees Cook# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 856 8289f913SMasahiro YamadaKBUILD_CFLAGS += -Wvla 857 0bb95f80SKees Cook 858 070b98bfSSam Ravnborg# disable pointer signed / unsigned warnings in gcc 4.0 859 fb073a4bSMasahiro YamadaKBUILD_CFLAGS += -Wno-pointer-sign 860 1da177e4SLinus Torvalds 861 217c3e01SStephen Rothwell# disable stringop warnings in gcc 8+ 862 217c3e01SStephen RothwellKBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 863 217c3e01SStephen Rothwell 864 fe8d0a41SKirill Smelkov# disable invalid "can't wrap" optimizations for signed / pointers 865 a137802eSLinus TorvaldsKBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 866 d0115552SLinus Torvalds 867 87e0d4f0SDaniel Borkmann# clang sets -fmerge-all-constants by default as optimization, but this 868 87e0d4f0SDaniel Borkmann# is non-conforming behavior for C and in fact breaks the kernel, so we 869 87e0d4f0SDaniel Borkmann# need to disable it here generally. 870 87e0d4f0SDaniel BorkmannKBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 871 87e0d4f0SDaniel Borkmann 872 87e0d4f0SDaniel Borkmann# for gcc -fno-merge-all-constants disables everything, but it is fine 873 87e0d4f0SDaniel Borkmann# to have actual conforming behavior enabled. 874 87e0d4f0SDaniel BorkmannKBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 875 87e0d4f0SDaniel Borkmann 876 3ce120b1SLinus Torvalds# Make sure -fstack-check isn't enabled (like gentoo apparently did) 877 3ce120b1SLinus TorvaldsKBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 878 3ce120b1SLinus Torvalds 879 8f7f5c9fSAndi Kleen# conserve stack if available 880 8f7f5c9fSAndi KleenKBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 881 8f7f5c9fSAndi Kleen 882 fe7c36c7SJosh Triplett# Prohibit date/time macros, which would make the build non-deterministic 883 fe7c36c7SJosh TriplettKBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 884 fe7c36c7SJosh Triplett 885 ea8daa7bSDaniel Wagner# enforce correct pointer usage 886 ea8daa7bSDaniel WagnerKBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 887 ea8daa7bSDaniel Wagner 888 c834f0e8SKees Cook# Require designated initializers for all marked structures 889 c834f0e8SKees CookKBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 890 c834f0e8SKees Cook 891 a73619a8SMasahiro Yamada# change __FILE__ to the relative path from the srctree 892 a73619a8SMasahiro YamadaKBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 893 a73619a8SMasahiro Yamada 894 29be86d7SSeth Forshee# ensure -fcf-protection is disabled when using retpoline as it is 895 29be86d7SSeth Forshee# incompatible with -mindirect-branch=thunk-extern 896 29be86d7SSeth Forsheeifdef CONFIG_RETPOLINE 897 29be86d7SSeth ForsheeKBUILD_CFLAGS += $(call cc-option,-fcf-protection=none) 898 29be86d7SSeth Forsheeendif 899 29be86d7SSeth Forshee 900 a436bb7bSMasahiro Yamadainclude scripts/Makefile.kasan 901 a436bb7bSMasahiro Yamadainclude scripts/Makefile.extrawarn 902 c6d30853SAndrey Ryabinininclude scripts/Makefile.ubsan 903 a86fe353SMasahiro Yamada 904 8cc7af75SMasahiro Yamada# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 905 8cc7af75SMasahiro YamadaKBUILD_CPPFLAGS += $(KCPPFLAGS) 906 8cc7af75SMasahiro YamadaKBUILD_AFLAGS += $(KAFLAGS) 907 8cc7af75SMasahiro YamadaKBUILD_CFLAGS += $(KCFLAGS) 908 52bcc330SSam Ravnborg 909 89ff7131SMasahiro YamadaKBUILD_LDFLAGS_MODULE += --build-id 910 89ff7131SMasahiro YamadaLDFLAGS_vmlinux += --build-id 911 18991197SRoland McGrath 912 5d7d18f5SDavid Howellsifeq ($(CONFIG_STRIP_ASM_SYMS),y) 913 d79a2719SAndi KleenLDFLAGS_vmlinux += $(call ld-option, -X,) 914 5d7d18f5SDavid Howellsendif 915 5d7d18f5SDavid Howells 916 5cf896fbSPeter Collingbourneifeq ($(CONFIG_RELR),y) 917 5cf896fbSPeter CollingbourneLDFLAGS_vmlinux += --pack-dyn-relocs=relr 918 5cf896fbSPeter Collingbourneendif 919 5cf896fbSPeter Collingbourne 920 14516765SLuc Van Oostenryck# insure the checker run with the right endianness 921 14516765SLuc Van OostenryckCHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 922 14516765SLuc Van Oostenryck 923 1f2f01b1SLuc Van Oostenryck# the checker needs the correct machine size 924 1f2f01b1SLuc Van OostenryckCHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 925 1f2f01b1SLuc Van Oostenryck 926 1da177e4SLinus Torvalds# Default kernel image to build when no specific target is given. 927 1da177e4SLinus Torvalds# KBUILD_IMAGE may be overruled on the command line or 928 1da177e4SLinus Torvalds# set in the environment 929 1da177e4SLinus Torvalds# Also any assignments in arch/$(ARCH)/Makefile take precedence over 930 1da177e4SLinus Torvalds# this default value 931 1da177e4SLinus Torvaldsexport KBUILD_IMAGE ?= vmlinux 932 1da177e4SLinus Torvalds 933 1da177e4SLinus Torvalds# 934 1da177e4SLinus Torvalds# INSTALL_PATH specifies where to place the updated kernel and system map 935 1da177e4SLinus Torvalds# images. Default is /boot, but you can set it to other values 936 1da177e4SLinus Torvaldsexport INSTALL_PATH ?= /boot 937 1da177e4SLinus Torvalds 938 1da177e4SLinus Torvalds# 939 f4d4ffc0SJason Cooper# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 940 f4d4ffc0SJason Cooper# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 941 f4d4ffc0SJason Cooper# an argument if needed. Otherwise it defaults to the kernel install path 942 f4d4ffc0SJason Cooper# 943 f4d4ffc0SJason Cooperexport INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 944 f4d4ffc0SJason Cooper 945 f4d4ffc0SJason Cooper# 946 1da177e4SLinus Torvalds# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 947 1da177e4SLinus Torvalds# relocations required by build roots. This is not defined in the 948 070b98bfSSam Ravnborg# makefile but the argument can be passed to make if needed. 949 1da177e4SLinus Torvalds# 950 1da177e4SLinus Torvalds 951 df9df036SSam RavnborgMODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 952 1da177e4SLinus Torvaldsexport MODLIB 953 1da177e4SLinus Torvalds 954 ac031f26STheodore Ts'o# 955 2ea03891SSam Ravnborg# INSTALL_MOD_STRIP, if defined, will cause modules to be 956 2ea03891SSam Ravnborg# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 957 2ea03891SSam Ravnborg# the default option --strip-debug will be used. Otherwise, 958 177b241dSGilles Espinasse# INSTALL_MOD_STRIP value will be used as the options to the strip command. 959 2ea03891SSam Ravnborg 960 ac031f26STheodore Ts'oifdef INSTALL_MOD_STRIP 961 ac031f26STheodore Ts'oifeq ($(INSTALL_MOD_STRIP),1) 962 2ea03891SSam Ravnborgmod_strip_cmd = $(STRIP) --strip-debug 963 ac031f26STheodore Ts'oelse 964 2ea03891SSam Ravnborgmod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 965 ac031f26STheodore Ts'oendif # INSTALL_MOD_STRIP=1 966 ac031f26STheodore Ts'oelse 967 2ea03891SSam Ravnborgmod_strip_cmd = true 968 ac031f26STheodore Ts'oendif # INSTALL_MOD_STRIP 969 ac031f26STheodore Ts'oexport mod_strip_cmd 970 ac031f26STheodore Ts'o 971 beb50df3SBertrand Jacquin# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 972 beb50df3SBertrand Jacquin# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 973 beb50df3SBertrand Jacquin# or CONFIG_MODULE_COMPRESS_XZ. 974 beb50df3SBertrand Jacquin 975 beb50df3SBertrand Jacquinmod_compress_cmd = true 976 beb50df3SBertrand Jacquinifdef CONFIG_MODULE_COMPRESS 977 beb50df3SBertrand Jacquin ifdef CONFIG_MODULE_COMPRESS_GZIP 978 3d1450d5SJason A. Donenfeld mod_compress_cmd = gzip -n -f 979 beb50df3SBertrand Jacquin endif # CONFIG_MODULE_COMPRESS_GZIP 980 beb50df3SBertrand Jacquin ifdef CONFIG_MODULE_COMPRESS_XZ 981 3d1450d5SJason A. Donenfeld mod_compress_cmd = xz -f 982 beb50df3SBertrand Jacquin endif # CONFIG_MODULE_COMPRESS_XZ 983 beb50df3SBertrand Jacquinendif # CONFIG_MODULE_COMPRESS 984 beb50df3SBertrand Jacquinexport mod_compress_cmd 985 beb50df3SBertrand Jacquin 986 d9d8d7edSMichal Marekifdef CONFIG_MODULE_SIG_ALL 987 3ee550f1SDavid Woodhouse$(eval $(call config_filename,MODULE_SIG_KEY)) 988 3ee550f1SDavid Woodhouse 989 3ee550f1SDavid Woodhousemod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 990 e2a666d5SRusty Russellelse 991 e2a666d5SRusty Russellmod_sign_cmd = true 992 e2a666d5SRusty Russellendif 993 e2a666d5SRusty Russellexport mod_sign_cmd 994 e2a666d5SRusty Russell 995 056d28d1SRolf Eike BeerHOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 996 056d28d1SRolf Eike Beer 997 9f0c18aeSJosh Poimboeufifdef CONFIG_STACK_VALIDATION 998 9f0c18aeSJosh Poimboeuf has_libelf := $(call try-run,\ 999 056d28d1SRolf Eike Beer echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 1000 9f0c18aeSJosh Poimboeuf ifeq ($(has_libelf),1) 1001 9f0c18aeSJosh Poimboeuf objtool_target := tools/objtool FORCE 1002 9f0c18aeSJosh Poimboeuf else 1003 9f0c18aeSJosh Poimboeuf SKIP_STACK_VALIDATION := 1 1004 9f0c18aeSJosh Poimboeuf export SKIP_STACK_VALIDATION 1005 9f0c18aeSJosh Poimboeuf endif 1006 9f0c18aeSJosh Poimboeufendif 1007 9f0c18aeSJosh Poimboeuf 1008 e00d8880SMasahiro YamadaPHONY += prepare0 1009 e2a666d5SRusty Russell 1010 394053f4SMasahiro Yamadaexport MODORDER := $(extmod-prefix)modules.order 1011 47801c97SMasahiro Yamada 1012 1da177e4SLinus Torvaldsifeq ($(KBUILD_EXTMOD),) 1013 cfc411e7SDavid Howellscore-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 1014 1da177e4SLinus Torvalds 1015 1da177e4SLinus Torvaldsvmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 1016 1da177e4SLinus Torvalds $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1017 37d9fe47SFeng Wu $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 1018 1da177e4SLinus Torvalds 1019 1eaca4b9SMasahiro Yamadavmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1020 1eaca4b9SMasahiro Yamada $(patsubst %/,%,$(filter %/, $(init-) $(core-) \ 1021 1eaca4b9SMasahiro Yamada $(drivers-) $(net-) $(libs-) $(virt-)))) 1022 1da177e4SLinus Torvalds 1023 c99f3918SMasahiro Yamadabuild-dirs := $(vmlinux-dirs) 1024 76cd306dSMasahiro Yamadaclean-dirs := $(vmlinux-alldirs) 1025 c99f3918SMasahiro Yamada 1026 f49821eeSNicholas Piggininit-y := $(patsubst %/, %/built-in.a, $(init-y)) 1027 f49821eeSNicholas Piggincore-y := $(patsubst %/, %/built-in.a, $(core-y)) 1028 f49821eeSNicholas Piggindrivers-y := $(patsubst %/, %/built-in.a, $(drivers-y)) 1029 f49821eeSNicholas Pigginnet-y := $(patsubst %/, %/built-in.a, $(net-y)) 1030 1da177e4SLinus Torvaldslibs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 1031 f49821eeSNicholas Pigginlibs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y))) 1032 f49821eeSNicholas Pigginvirt-y := $(patsubst %/, %/built-in.a, $(virt-y)) 1033 1da177e4SLinus Torvalds 1034 1f2bfbd0SSam Ravnborg# Externally visible symbols (used by link-vmlinux.sh) 1035 d151e971SMasahiro Yamadaexport KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \ 1036 d151e971SMasahiro Yamada $(drivers-y) $(net-y) $(virt-y) 1037 3a166fc2SNicholas Pigginexport KBUILD_VMLINUX_LIBS := $(libs-y1) 1038 95698570SSam Ravnborgexport KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1039 1f2bfbd0SSam Ravnborgexport LDFLAGS_vmlinux 1040 85f0ae7eSMasahiro Yamada# used by scripts/Makefile.package 1041 233c741dSMasahiro Yamadaexport KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1042 1da177e4SLinus Torvalds 1043 d151e971SMasahiro Yamadavmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1044 1da177e4SLinus Torvalds 1045 3fdc7d3fSMasahiro Yamada# Recurse until adjust_autoksyms.sh is satisfied 1046 3fdc7d3fSMasahiro YamadaPHONY += autoksyms_recursive 1047 2441e78bSNicolas Pitreifdef CONFIG_TRIM_UNUSED_KSYMS 1048 c99f3918SMasahiro Yamadaautoksyms_recursive: descend modules.order 1049 ba79d401SNicolas Ferre $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1050 86556392SNicolas Pitre "$(MAKE) -f $(srctree)/Makefile vmlinux" 1051 2441e78bSNicolas Pitreendif 1052 23121ca2SNicolas Pitre 1053 1f50b80aSMasahiro Yamada# For the kernel to actually contain only the needed exported symbols, 1054 1f50b80aSMasahiro Yamada# we have to build modules as well to determine what those symbols are. 1055 1f50b80aSMasahiro Yamada# (this can be evaluated only once include/config/auto.conf has been included) 1056 1f50b80aSMasahiro Yamadaifdef CONFIG_TRIM_UNUSED_KSYMS 1057 1f50b80aSMasahiro Yamada KBUILD_MODULES := 1 1058 1f50b80aSMasahiro Yamadaendif 1059 1f50b80aSMasahiro Yamada 1060 07a422bbSMasahiro Yamadaautoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1061 07a422bbSMasahiro Yamada 1062 07a422bbSMasahiro Yamada$(autoksyms_h): 1063 07a422bbSMasahiro Yamada $(Q)mkdir -p $(dir $@) 1064 07a422bbSMasahiro Yamada $(Q)touch $@ 1065 23121ca2SNicolas Pitre 1066 fbe6e37dSNicholas PigginARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1067 fbe6e37dSNicholas Piggin 1068 fbe6e37dSNicholas Piggin# Final link of vmlinux with optional arch pass after final link 1069 fbe6e37dSNicholas Piggincmd_link-vmlinux = \ 1070 d503ac53SMasahiro Yamada $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1071 fbe6e37dSNicholas Piggin $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1072 2441e78bSNicolas Pitre 1073 3fdc7d3fSMasahiro Yamadavmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1074 1f2bfbd0SSam Ravnborg +$(call if_changed,link-vmlinux) 1075 741f98feSSam Ravnborg 1076 392885eeSMasahiro Yamadatargets := vmlinux 1077 392885eeSMasahiro Yamada 1078 1da177e4SLinus Torvalds# The actual objects are generated when descending, 1079 1da177e4SLinus Torvalds# make sure no implicit rule kicks in 1080 c99f3918SMasahiro Yamada$(sort $(vmlinux-deps)): descend ; 1081 1da177e4SLinus Torvalds 1082 ba97df45SMasahiro Yamadafilechk_kernel.release = \ 1083 0d0e7718SMichal Marek echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1084 0d0e7718SMichal Marek 1085 83a35e36SGeert Uytterhoeven# Store (new) KERNELRELEASE string in include/config/kernel.release 1086 24512795SMasahiro Yamadainclude/config/kernel.release: FORCE 1087 0d0e7718SMichal Marek $(call filechk,kernel.release) 1088 cb58455cSSam Ravnborg 1089 d8821622SMasahiro Yamada# Additional helpers built in scripts/ 1090 d8821622SMasahiro Yamada# Carefully list dependencies so we do not try to build scripts twice 1091 d8821622SMasahiro Yamada# in parallel 1092 d8821622SMasahiro YamadaPHONY += scripts 1093 60df1aeeSMasahiro Yamadascripts: scripts_basic scripts_dtc 1094 d8821622SMasahiro Yamada $(Q)$(MAKE) $(build)=$(@) 1095 cb58455cSSam Ravnborg 1096 1da177e4SLinus Torvalds# Things we need to do before we recursively start building the kernel 1097 5bb78269SSam Ravnborg# or the modules are listed in "prepare". 1098 5bb78269SSam Ravnborg# A multi level approach is used. prepareN is processed before prepareN-1. 1099 5bb78269SSam Ravnborg# archprepare is used in arch Makefiles and when processed asm symlink, 1100 5bb78269SSam Ravnborg# version.h and scripts_basic is processed / created. 1101 1da177e4SLinus Torvalds 1102 a5139fb3SMasahiro YamadaPHONY += prepare archprepare 1103 5bb78269SSam Ravnborg 1104 36de077bSMasahiro Yamadaarchprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1105 30527cefSMasahiro Yamada asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h 1106 5bb78269SSam Ravnborg 1107 65bba042SMasahiro Yamadaprepare0: archprepare 1108 60df1aeeSMasahiro Yamada $(Q)$(MAKE) $(build)=scripts/mod 1109 8d36a623SSam Ravnborg $(Q)$(MAKE) $(build)=. 1110 86feeaa8SSam Ravnborg 1111 1da177e4SLinus Torvalds# All the preparing.. 1112 b9ab5ebbSJosh Poimboeufprepare: prepare0 prepare-objtool 1113 b9ab5ebbSJosh Poimboeuf 1114 2c1f4f12SMasahiro Yamada# Support for using generic headers in asm-generic 1115 7d0e5c20SMasahiro Yamadaasm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1116 7d0e5c20SMasahiro Yamada 1117 2c1f4f12SMasahiro YamadaPHONY += asm-generic uapi-asm-generic 1118 2c1f4f12SMasahiro Yamadaasm-generic: uapi-asm-generic 1119 037fc336SMasahiro Yamada $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1120 037fc336SMasahiro Yamada generic=include/asm-generic 1121 2c1f4f12SMasahiro Yamadauapi-asm-generic: 1122 037fc336SMasahiro Yamada $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1123 037fc336SMasahiro Yamada generic=include/uapi/asm-generic 1124 2c1f4f12SMasahiro Yamada 1125 b9ab5ebbSJosh PoimboeufPHONY += prepare-objtool 1126 3b27a0c8SJosh Poimboeufprepare-objtool: $(objtool_target) 1127 ef7cfd00SMasahiro Yamadaifeq ($(SKIP_STACK_VALIDATION),1) 1128 ef7cfd00SMasahiro Yamadaifdef CONFIG_UNWINDER_ORC 1129 ef7cfd00SMasahiro Yamada @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1130 ef7cfd00SMasahiro Yamada @false 1131 ef7cfd00SMasahiro Yamadaelse 1132 ef7cfd00SMasahiro Yamada @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1133 ef7cfd00SMasahiro Yamadaendif 1134 ef7cfd00SMasahiro Yamadaendif 1135 1da177e4SLinus Torvalds 1136 1da177e4SLinus Torvalds# Generate some files 1137 1da177e4SLinus Torvalds# --------------------------------------------------------------------------- 1138 1da177e4SLinus Torvalds 1139 1da177e4SLinus Torvalds# KERNELRELEASE can change from a few different places, meaning version.h 1140 1da177e4SLinus Torvalds# needs to be updated, so this check is forced on all builds 1141 1da177e4SLinus Torvalds 1142 1da177e4SLinus Torvaldsuts_len := 64 1143 63104eecSSam Ravnborgdefine filechk_utsrelease.h 1144 1da177e4SLinus Torvalds if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1145 1da177e4SLinus Torvalds echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1146 1da177e4SLinus Torvalds exit 1; \ 1147 1da177e4SLinus Torvalds fi; \ 1148 ad774086SMasahiro Yamada echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1149 1da177e4SLinus Torvaldsendef 1150 1da177e4SLinus Torvalds 1151 63104eecSSam Ravnborgdefine filechk_version.h 1152 ad774086SMasahiro Yamada echo \#define LINUX_VERSION_CODE $(shell \ 1153 78d3bb44SMichal Marek expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1154 ad774086SMasahiro Yamada echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))' 1155 63104eecSSam Ravnborgendef 1156 63104eecSSam Ravnborg 1157 43fee2b2SMasahiro Yamada$(version_h): FORCE 1158 1da177e4SLinus Torvalds $(call filechk,version.h) 1159 223c24a7SMichal Marek $(Q)rm -f $(old_version_h) 1160 1da177e4SLinus Torvalds 1161 273b281fSSam Ravnborginclude/generated/utsrelease.h: include/config/kernel.release FORCE 1162 63104eecSSam Ravnborg $(call filechk,utsrelease.h) 1163 63104eecSSam Ravnborg 1164 179efcb4SVegard NossumPHONY += headerdep 1165 179efcb4SVegard Nossumheaderdep: 1166 9663d989SPeter Foley $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1167 9663d989SPeter Foley $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1168 179efcb4SVegard Nossum 1169 1da177e4SLinus Torvalds# --------------------------------------------------------------------------- 1170 8d730cfbSDavid Woodhouse# Kernel headers 1171 8d730cfbSDavid Woodhouse 1172 e6883b18SSam Ravnborg#Default location for installed headers 1173 e6883b18SSam Ravnborgexport INSTALL_HDR_PATH = $(objtree)/usr 1174 e6883b18SSam Ravnborg 1175 59b2bd05SMasahiro Yamadaquiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1176 59b2bd05SMasahiro Yamada cmd_headers_install = \ 1177 59b2bd05SMasahiro Yamada mkdir -p $(INSTALL_HDR_PATH); \ 1178 59b2bd05SMasahiro Yamada rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1179 59b2bd05SMasahiro Yamada usr/include $(INSTALL_HDR_PATH) 1180 6d716275SDavid Woodhouse 1181 8d730cfbSDavid WoodhousePHONY += headers_install 1182 59b2bd05SMasahiro Yamadaheaders_install: headers 1183 59b2bd05SMasahiro Yamada $(call cmd,headers_install) 1184 4f193362SPaul Smith 1185 1da177e4SLinus TorvaldsPHONY += archheaders archscripts 1186 1da177e4SLinus Torvalds 1187 a5bae54cSMasahiro Yamadahdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1188 1da177e4SLinus Torvalds 1189 59b2bd05SMasahiro YamadaPHONY += headers 1190 59b2bd05SMasahiro Yamadaheaders: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1191 9d022c54SMasahiro Yamada $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1192 2fb9b1bdSSam Ravnborg $(error Headers not exportable for the $(SRCARCH) architecture)) 1193 d5470d14SMasahiro Yamada $(Q)$(MAKE) $(hdr-inst)=include/uapi 1194 d5470d14SMasahiro Yamada $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1195 1f85712eSMike Frysinger 1196 68475359SDavid WoodhousePHONY += headers_check 1197 59b2bd05SMasahiro Yamadaheaders_check: headers 1198 d5470d14SMasahiro Yamada $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1 1199 d5470d14SMasahiro Yamada $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi HDRCHECK=1 1200 68475359SDavid Woodhouse 1201 e949f4c2SMasahiro Yamadaifdef CONFIG_HEADERS_INSTALL 1202 59b2bd05SMasahiro Yamadaprepare: headers 1203 e949f4c2SMasahiro Yamadaendif 1204 1da177e4SLinus Torvalds 1205 257edce6SMasahiro Yamadaifdef CONFIG_HEADERS_CHECK 1206 257edce6SMasahiro Yamadaall: headers_check 1207 257edce6SMasahiro Yamadaendif 1208 257edce6SMasahiro Yamada 1209 bdd7714bSMasahiro YamadaPHONY += scripts_unifdef 1210 bdd7714bSMasahiro Yamadascripts_unifdef: scripts_basic 1211 bdd7714bSMasahiro Yamada $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1212 bdd7714bSMasahiro Yamada 1213 1da177e4SLinus Torvalds# --------------------------------------------------------------------------- 1214 5a5da78bSShuah Khan# Kernel selftest 1215 5a5da78bSShuah Khan 1216 5a5da78bSShuah KhanPHONY += kselftest 1217 5a5da78bSShuah Khankselftest: 1218 2bc84526SShuah Khan $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1219 5a5da78bSShuah Khan 1220 17eac6c2SShuah Khankselftest-%: FORCE 1221 17eac6c2SShuah Khan $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1222 dcb825a9SWang Long 1223 3d6dee7aSBamvor Jian ZhangPHONY += kselftest-merge 1224 3d6dee7aSBamvor Jian Zhangkselftest-merge: 1225 3d6dee7aSBamvor Jian Zhang $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1226 6d3db46cSDan Rue $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1227 6d3db46cSDan Rue xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1228 3e4c6948SMasahiro Yamada $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1229 3d6dee7aSBamvor Jian Zhang 1230 5a5da78bSShuah Khan# --------------------------------------------------------------------------- 1231 37c8a5faSRob Herring# Devicetree files 1232 37c8a5faSRob Herring 1233 37c8a5faSRob Herringifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1234 37c8a5faSRob Herringdtstree := arch/$(SRCARCH)/boot/dts 1235 37c8a5faSRob Herringendif 1236 37c8a5faSRob Herring 1237 37c8a5faSRob Herringifneq ($(dtstree),) 1238 37c8a5faSRob Herring 1239 a5139fb3SMasahiro Yamada%.dtb: include/config/kernel.release scripts_dtc 1240 37c8a5faSRob Herring $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1241 37c8a5faSRob Herring 1242 4f0e3a57SRob HerringPHONY += dtbs dtbs_install dt_binding_check 1243 a5139fb3SMasahiro Yamadadtbs dtbs_check: include/config/kernel.release scripts_dtc 1244 37c8a5faSRob Herring $(Q)$(MAKE) $(build)=$(dtstree) 1245 37c8a5faSRob Herring 1246 4f0e3a57SRob Herringdtbs_check: export CHECK_DTBS=1 1247 4f0e3a57SRob Herringdtbs_check: dt_binding_check 1248 4f0e3a57SRob Herring 1249 37c8a5faSRob Herringdtbs_install: 1250 37c8a5faSRob Herring $(Q)$(MAKE) $(dtbinst)=$(dtstree) 1251 37c8a5faSRob Herring 1252 37c8a5faSRob Herringifdef CONFIG_OF_EARLY_FLATTREE 1253 37c8a5faSRob Herringall: dtbs 1254 37c8a5faSRob Herringendif 1255 37c8a5faSRob Herring 1256 37c8a5faSRob Herringendif 1257 37c8a5faSRob Herring 1258 37c8a5faSRob HerringPHONY += scripts_dtc 1259 37c8a5faSRob Herringscripts_dtc: scripts_basic 1260 37c8a5faSRob Herring $(Q)$(MAKE) $(build)=scripts/dtc 1261 37c8a5faSRob Herring 1262 4f0e3a57SRob Herringdt_binding_check: scripts_dtc 1263 4f0e3a57SRob Herring $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1264 4f0e3a57SRob Herring 1265 37c8a5faSRob Herring# --------------------------------------------------------------------------- 1266 1da177e4SLinus Torvalds# Modules 1267 1da177e4SLinus Torvalds 1268 1da177e4SLinus Torvaldsifdef CONFIG_MODULES 1269 1da177e4SLinus Torvalds 1270 1da177e4SLinus Torvalds# By default, build modules as well 1271 1da177e4SLinus Torvalds 1272 73d1393eSMichal Marekall: modules 1273 1da177e4SLinus Torvalds 1274 1da177e4SLinus Torvalds# Build modules 1275 551559e1STejun Heo# 1276 551559e1STejun Heo# A module can be listed more than once in obj-m resulting in 1277 551559e1STejun Heo# duplicate lines in modules.order files. Those are removed 1278 551559e1STejun Heo# using awk while concatenating to the final file. 1279 1da177e4SLinus Torvalds 1280 4f193362SPaul SmithPHONY += modules 1281 68980b47SMasahiro Yamadamodules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order modules.builtin 1282 b805aa0eSSam Ravnborg $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1283 3a48a919SMasahiro Yamada $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh 1284 1da177e4SLinus Torvalds 1285 c99f3918SMasahiro Yamadamodules.order: descend 1286 c99f3918SMasahiro Yamada $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@ 1287 a6c36632SMichal Marek 1288 c99f3918SMasahiro Yamadamodbuiltin-dirs := $(addprefix _modbuiltin_, $(build-dirs)) 1289 a6c36632SMichal Marek 1290 50ef0cdfSMasahiro Yamadamodules.builtin: $(modbuiltin-dirs) 1291 c99f3918SMasahiro Yamada $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@ 1292 1da177e4SLinus Torvalds 1293 50ef0cdfSMasahiro YamadaPHONY += $(modbuiltin-dirs) 1294 50ef0cdfSMasahiro Yamada# tristate.conf is not included from this Makefile. Add it as a prerequisite 1295 50ef0cdfSMasahiro Yamada# here to make it self-healing in case somebody accidentally removes it. 1296 50ef0cdfSMasahiro Yamada$(modbuiltin-dirs): include/config/tristate.conf 1297 50ef0cdfSMasahiro Yamada $(Q)$(MAKE) $(modbuiltin)=$(patsubst _modbuiltin_%,%,$@) 1298 1da177e4SLinus Torvalds 1299 1da177e4SLinus Torvalds# Target to prepare building external modules 1300 4f193362SPaul SmithPHONY += modules_prepare 1301 059bc9fcSMasahiro Yamadamodules_prepare: prepare 1302 1da177e4SLinus Torvalds 1303 1da177e4SLinus Torvalds# Target to install modules 1304 4f193362SPaul SmithPHONY += modules_install 1305 1da177e4SLinus Torvaldsmodules_install: _modinst_ _modinst_post 1306 1da177e4SLinus Torvalds 1307 4f193362SPaul SmithPHONY += _modinst_ 1308 2da30e70SMichal Marek_modinst_: 1309 1da177e4SLinus Torvalds @rm -rf $(MODLIB)/kernel 1310 1da177e4SLinus Torvalds @rm -f $(MODLIB)/source 1311 1da177e4SLinus Torvalds @mkdir -p $(MODLIB)/kernel 1312 8e9b4667SMasahiro Yamada @ln -s $(abspath $(srctree)) $(MODLIB)/source 1313 1da177e4SLinus Torvalds @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1314 1da177e4SLinus Torvalds rm -f $(MODLIB)/build ; \ 1315 7e1c0477SMichal Marek ln -s $(CURDIR) $(MODLIB)/build ; \ 1316 1da177e4SLinus Torvalds fi 1317 1bd9a468SMasahiro Yamada @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1318 1bd9a468SMasahiro Yamada @sed 's:^:kernel/:' modules.builtin > $(MODLIB)/modules.builtin 1319 898490c0SAlexey Gladkov @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1320 b805aa0eSSam Ravnborg $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1321 1da177e4SLinus Torvalds 1322 50a8ec31SSam Ravnborg# This depmod is only for convenience to give the initial 1323 1da177e4SLinus Torvalds# boot a modules.dep even before / is mounted read-write. However the 1324 1da177e4SLinus Torvalds# boot script depmod is the master version. 1325 4f193362SPaul SmithPHONY += _modinst_post 1326 6d128e1eSLinus Torvalds_modinst_post: _modinst_ 1327 50a8ec31SSam Ravnborg $(call cmd,depmod) 1328 1da177e4SLinus Torvalds 1329 d890f510SJosh Boyerifeq ($(CONFIG_MODULE_SIG), y) 1330 d890f510SJosh BoyerPHONY += modules_sign 1331 d890f510SJosh Boyermodules_sign: 1332 d890f510SJosh Boyer $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1333 d890f510SJosh Boyerendif 1334 d890f510SJosh Boyer 1335 1da177e4SLinus Torvaldselse # CONFIG_MODULES 1336 1da177e4SLinus Torvalds 1337 1da177e4SLinus Torvalds# Modules not configured 1338 1da177e4SLinus Torvalds# --------------------------------------------------------------------------- 1339 1da177e4SLinus Torvalds 1340 612e47ceSMasahiro YamadaPHONY += modules modules_install 1341 612e47ceSMasahiro Yamadamodules modules_install: 1342 5369f550SMichal Marek @echo >&2 1343 5369f550SMichal Marek @echo >&2 "The present kernel configuration has modules disabled." 1344 5369f550SMichal Marek @echo >&2 "Type 'make config' and enable loadable module support." 1345 5369f550SMichal Marek @echo >&2 "Then build a kernel with module support enabled." 1346 5369f550SMichal Marek @echo >&2 1347 1da177e4SLinus Torvalds @exit 1 1348 1da177e4SLinus Torvalds 1349 1da177e4SLinus Torvaldsendif # CONFIG_MODULES 1350 1da177e4SLinus Torvalds 1351 1da177e4SLinus Torvalds### 1352 1da177e4SLinus Torvalds# Cleaning is done on three levels. 1353 1da177e4SLinus Torvalds# make clean Delete most generated files 1354 1da177e4SLinus Torvalds# Leave enough to build external modules 1355 1da177e4SLinus Torvalds# make mrproper Delete the current configuration, and all generated files 1356 1da177e4SLinus Torvalds# make distclean Remove editor backup files, patch leftover files and the like 1357 1da177e4SLinus Torvalds 1358 1da177e4SLinus Torvalds# Directories & files removed with 'make clean' 1359 b7dca6ddSMasahiro YamadaCLEAN_DIRS += include/ksym 1360 898490c0SAlexey GladkovCLEAN_FILES += modules.builtin.modinfo 1361 1da177e4SLinus Torvalds 1362 1da177e4SLinus Torvalds# Directories & files removed with 'make mrproper' 1363 d6fc9fcbSMasahiro YamadaMRPROPER_DIRS += include/config include/generated \ 1364 46a63d4bSMasahiro Yamada arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1365 46a63d4bSMasahiro Yamada debian/ snap/ tar-install/ 1366 278ae604SMasahiro YamadaMRPROPER_FILES += .config .config.old .version \ 1367 46457133SMasahiro Yamada Module.symvers \ 1368 fb117949SDavid Woodhouse signing_key.pem signing_key.priv signing_key.x509 \ 1369 fb117949SDavid Woodhouse x509.genkey extra_certificates signing_key.x509.keyid \ 1370 46a63d4bSMasahiro Yamada signing_key.x509.signer vmlinux-gdb.py \ 1371 46a63d4bSMasahiro Yamada *.spec 1372 1da177e4SLinus Torvalds 1373 46457133SMasahiro Yamada# Directories & files removed with 'make distclean' 1374 46457133SMasahiro YamadaDISTCLEAN_DIRS += 1375 46457133SMasahiro YamadaDISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS 1376 46457133SMasahiro Yamada 1377 1da177e4SLinus Torvalds# clean - Delete most, but leave enough to build external modules 1378 1da177e4SLinus Torvalds# 1379 1da177e4SLinus Torvaldsclean: rm-dirs := $(CLEAN_DIRS) 1380 1da177e4SLinus Torvaldsclean: rm-files := $(CLEAN_FILES) 1381 1da177e4SLinus Torvalds 1382 76cd306dSMasahiro YamadaPHONY += archclean vmlinuxclean 1383 1da177e4SLinus Torvalds 1384 bd1ee804SPawel Mollvmlinuxclean: 1385 bd1ee804SPawel Moll $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1386 fbe6e37dSNicholas Piggin $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1387 bd1ee804SPawel Moll 1388 bd1ee804SPawel Mollclean: archclean vmlinuxclean 1389 1da177e4SLinus Torvalds 1390 1da177e4SLinus Torvalds# mrproper - Delete all generated files, including .config 1391 1da177e4SLinus Torvalds# 1392 1da177e4SLinus Torvaldsmrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1393 1da177e4SLinus Torvaldsmrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1394 cb43fb57SMauro Carvalho Chehabmrproper-dirs := $(addprefix _mrproper_,scripts) 1395 1da177e4SLinus Torvalds 1396 b421b8a6SMasahiro YamadaPHONY += $(mrproper-dirs) mrproper 1397 1da177e4SLinus Torvalds$(mrproper-dirs): 1398 1da177e4SLinus Torvalds $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1399 1da177e4SLinus Torvalds 1400 b421b8a6SMasahiro Yamadamrproper: clean $(mrproper-dirs) 1401 1da177e4SLinus Torvalds $(call cmd,rmdirs) 1402 1da177e4SLinus Torvalds $(call cmd,rmfiles) 1403 1da177e4SLinus Torvalds 1404 1da177e4SLinus Torvalds# distclean 1405 1da177e4SLinus Torvalds# 1406 46457133SMasahiro Yamadadistclean: rm-dirs := $(wildcard $(DISTCLEAN_DIRS)) 1407 46457133SMasahiro Yamadadistclean: rm-files := $(wildcard $(DISTCLEAN_FILES)) 1408 46457133SMasahiro Yamada 1409 4f193362SPaul SmithPHONY += distclean 1410 1da177e4SLinus Torvalds 1411 1da177e4SLinus Torvaldsdistclean: mrproper 1412 46457133SMasahiro Yamada $(call cmd,rmdirs) 1413 46457133SMasahiro Yamada $(call cmd,rmfiles) 1414 1da177e4SLinus Torvalds @find $(srctree) $(RCS_FIND_IGNORE) \ 1415 1da177e4SLinus Torvalds \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1416 f78271dfSMasahiro Yamada -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1417 f78271dfSMasahiro Yamada -o -name 'core' \) \ 1418 1da177e4SLinus Torvalds -type f -print | xargs rm -f 1419 1da177e4SLinus Torvalds 1420 1da177e4SLinus Torvalds 1421 1da177e4SLinus Torvalds# Packaging of the kernel to various formats 1422 1da177e4SLinus Torvalds# --------------------------------------------------------------------------- 1423 1da177e4SLinus Torvalds 1424 bafb6747SArnaldo Carvalho de Melo%src-pkg: FORCE 1425 000ec95fSMasahiro Yamada $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1426 031ecc6dSZach Brown%pkg: include/config/kernel.release FORCE 1427 000ec95fSMasahiro Yamada $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1428 1da177e4SLinus Torvalds 1429 1da177e4SLinus Torvalds# Brief documentation of the typical targets used 1430 1da177e4SLinus Torvalds# --------------------------------------------------------------------------- 1431 1da177e4SLinus Torvalds 1432 5dffbe81SSegher Boessenkoolboards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1433 a1e7b7bbSKonstantin Khlebnikovboards := $(sort $(notdir $(boards))) 1434 5dffbe81SSegher Boessenkoolboard-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1435 5dffbe81SSegher Boessenkoolboard-dirs := $(sort $(notdir $(board-dirs:/=))) 1436 1da177e4SLinus Torvalds 1437 fe69b420SMasahiro YamadaPHONY += help 1438 1da177e4SLinus Torvaldshelp: 1439 1da177e4SLinus Torvalds @echo 'Cleaning targets:' 1440 5ea084efSSamuel Tardieu @echo ' clean - Remove most generated files but keep the config and' 1441 5cc8d246SJesper Juhl @echo ' enough build support to build external modules' 1442 5ea084efSSamuel Tardieu @echo ' mrproper - Remove all generated files + config + various backup files' 1443 5cc8d246SJesper Juhl @echo ' distclean - mrproper + remove editor backup and patch files' 1444 1da177e4SLinus Torvalds @echo '' 1445 1da177e4SLinus Torvalds @echo 'Configuration targets:' 1446 1da177e4SLinus Torvalds @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1447 1da177e4SLinus Torvalds @echo '' 1448 1da177e4SLinus Torvalds @echo 'Other generic targets:' 1449 1da177e4SLinus Torvalds @echo ' all - Build all targets marked with [*]' 1450 1da177e4SLinus Torvalds @echo '* vmlinux - Build the bare kernel' 1451 1da177e4SLinus Torvalds @echo '* modules - Build all modules' 1452 9cc5d74cSBodo Eggert @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1453 1da177e4SLinus Torvalds @echo ' dir/ - Build all files in dir and below' 1454 40ab87a4SWang YanQing @echo ' dir/file.[ois] - Build specified target only' 1455 433db3e2SVinÃcius Tinti @echo ' dir/file.ll - Build the LLVM assembly file' 1456 433db3e2SVinÃcius Tinti @echo ' (requires compiler support for LLVM assembly generation)' 1457 62718979SJoe Perches @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1458 62718979SJoe Perches @echo ' (requires a recent binutils and recent build (System.map))' 1459 155ad605SSam Ravnborg @echo ' dir/file.ko - Build module including final link' 1460 c4d5ee67SRobert P. J. Day @echo ' modules_prepare - Set up for building external modules' 1461 1da177e4SLinus Torvalds @echo ' tags/TAGS - Generate tags file for editors' 1462 1da177e4SLinus Torvalds @echo ' cscope - Generate cscope index' 1463 f4ed1009SJianbin Kang @echo ' gtags - Generate GNU GLOBAL index' 1464 3f1d9a6cSMichal Marek @echo ' kernelrelease - Output the release version string (use with make -s)' 1465 3f1d9a6cSMichal Marek @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1466 3f1d9a6cSMichal Marek @echo ' image_name - Output the image name (use with make -s)' 1467 2fb9b1bdSSam Ravnborg @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1468 59df3230SGeert Uytterhoeven echo ' (default: $(INSTALL_HDR_PATH))'; \ 1469 2fb9b1bdSSam Ravnborg echo '' 1470 31b8cc80SRandy Dunlap @echo 'Static analysers:' 1471 1da177e4SLinus Torvalds @echo ' checkstack - Generate a list of stack hogs' 1472 1da177e4SLinus Torvalds @echo ' namespacecheck - Name space analysis on compiled kernel' 1473 aa025e7dSSam Ravnborg @echo ' versioncheck - Sanity check on version.h usage' 1474 ec2d987fSRandy Dunlap @echo ' includecheck - Check for duplicate included header files' 1475 295ac051SAdrian Bunk @echo ' export_report - List the usages of all exported symbols' 1476 179efcb4SVegard Nossum @echo ' headers_check - Sanity check on exported headers' 1477 74425eeeSNicolas Palix @echo ' headerdep - Detect inclusion cycles in headers' 1478 7f855fc8SMasahiro Yamada @echo ' coccicheck - Check with Coccinelle' 1479 74425eeeSNicolas Palix @echo '' 1480 eb8305aeSMatthias Maennich @echo 'Tools:' 1481 eb8305aeSMatthias Maennich @echo ' nsdeps - Generate missing symbol namespace dependencies' 1482 eb8305aeSMatthias Maennich @echo '' 1483 31b8cc80SRandy Dunlap @echo 'Kernel selftest:' 1484 5a5da78bSShuah Khan @echo ' kselftest - Build and run kernel selftest (run as root)' 1485 5a5da78bSShuah Khan @echo ' Build, install, and boot kernel before' 1486 5a5da78bSShuah Khan @echo ' running kselftest on it' 1487 dcb825a9SWang Long @echo ' kselftest-clean - Remove all generated kselftest files' 1488 bbfe63b6SRandy Dunlap @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' 1489 3d6dee7aSBamvor Jian Zhang @echo ' .config.' 1490 5a5da78bSShuah Khan @echo '' 1491 37c8a5faSRob Herring @$(if $(dtstree), \ 1492 37c8a5faSRob Herring echo 'Devicetree:'; \ 1493 37c8a5faSRob Herring echo '* dtbs - Build device tree blobs for enabled boards'; \ 1494 37c8a5faSRob Herring echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1495 7aa8dd91SStephen Boyd echo ' dt_binding_check - Validate device tree binding documents'; \ 1496 7aa8dd91SStephen Boyd echo ' dtbs_check - Validate device tree source files';\ 1497 37c8a5faSRob Herring echo '') 1498 37c8a5faSRob Herring 1499 31b8cc80SRandy Dunlap @echo 'Userspace tools targets:' 1500 31b8cc80SRandy Dunlap @echo ' use "make tools/help"' 1501 31b8cc80SRandy Dunlap @echo ' or "cd tools; make help"' 1502 31b8cc80SRandy Dunlap @echo '' 1503 1da177e4SLinus Torvalds @echo 'Kernel packaging:' 1504 000ec95fSMasahiro Yamada @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1505 1da177e4SLinus Torvalds @echo '' 1506 1da177e4SLinus Torvalds @echo 'Documentation targets:' 1507 cb43fb57SMauro Carvalho Chehab @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1508 1da177e4SLinus Torvalds @echo '' 1509 01dee188SAndres Salomon @echo 'Architecture specific targets ($(SRCARCH)):' 1510 1da177e4SLinus Torvalds @$(if $(archhelp),$(archhelp),\ 1511 01dee188SAndres Salomon echo ' No architecture specific help defined for $(SRCARCH)') 1512 1da177e4SLinus Torvalds @echo '' 1513 1da177e4SLinus Torvalds @$(if $(boards), \ 1514 1da177e4SLinus Torvalds $(foreach b, $(boards), \ 1515 1da177e4SLinus Torvalds printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1516 1da177e4SLinus Torvalds echo '') 1517 5dffbe81SSegher Boessenkool @$(if $(board-dirs), \ 1518 5dffbe81SSegher Boessenkool $(foreach b, $(board-dirs), \ 1519 5dffbe81SSegher Boessenkool printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1520 5dffbe81SSegher Boessenkool printf " %-16s - Show all of the above\\n" help-boards; \ 1521 5dffbe81SSegher Boessenkool echo '') 1522 1da177e4SLinus Torvalds 1523 1da177e4SLinus Torvalds @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1524 45d506bdSSam Ravnborg @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1525 1da177e4SLinus Torvalds @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1526 9ba26a72SCao jin @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' 1527 701842e3SDustin Kirkland @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1528 af07ce3eSIngo Molnar @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1529 e27128dbSMasahiro Yamada @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1530 28bc20dcSSam Ravnborg @echo ' 1: warnings which may be relevant and do not occur too often' 1531 28bc20dcSSam Ravnborg @echo ' 2: warnings which occur quite often but may still be relevant' 1532 28bc20dcSSam Ravnborg @echo ' 3: more obscure warnings, can most likely be ignored' 1533 a6de553dSMichal Marek @echo ' Multiple levels can be combined with W=12 or W=123' 1534 1da177e4SLinus Torvalds @echo '' 1535 1da177e4SLinus Torvalds @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1536 1da177e4SLinus Torvalds @echo 'For further info see the ./README file' 1537 1da177e4SLinus Torvalds 1538 1da177e4SLinus Torvalds 1539 5dffbe81SSegher Boessenkoolhelp-board-dirs := $(addprefix help-,$(board-dirs)) 1540 5dffbe81SSegher Boessenkool 1541 5dffbe81SSegher Boessenkoolhelp-boards: $(help-board-dirs) 1542 5dffbe81SSegher Boessenkool 1543 fbae4d58SMichal Marekboards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1544 5dffbe81SSegher Boessenkool 1545 5dffbe81SSegher Boessenkool$(help-board-dirs): help-%: 1546 5dffbe81SSegher Boessenkool @echo 'Architecture specific targets ($(SRCARCH) $*):' 1547 5dffbe81SSegher Boessenkool @$(if $(boards-per-dir), \ 1548 5dffbe81SSegher Boessenkool $(foreach b, $(boards-per-dir), \ 1549 5dffbe81SSegher Boessenkool printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1550 5dffbe81SSegher Boessenkool echo '') 1551 5dffbe81SSegher Boessenkool 1552 5dffbe81SSegher Boessenkool 1553 1da177e4SLinus Torvalds# Documentation targets 1554 1da177e4SLinus Torvalds# --------------------------------------------------------------------------- 1555 e8939222SJani NikulaDOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1556 e8939222SJani Nikula linkcheckdocs dochelp refcheckdocs 1557 22cba31bSJani NikulaPHONY += $(DOC_TARGETS) 1558 bc7b752aSMasahiro Yamada$(DOC_TARGETS): 1559 cb43fb57SMauro Carvalho Chehab $(Q)$(MAKE) $(build)=Documentation $@ 1560 1da177e4SLinus Torvalds 1561 67274c08SMasahiro Yamada# Misc 1562 67274c08SMasahiro Yamada# --------------------------------------------------------------------------- 1563 67274c08SMasahiro Yamada 1564 67274c08SMasahiro YamadaPHONY += scripts_gdb 1565 7a739ce5SMasahiro Yamadascripts_gdb: prepare0 1566 1e5ff84fSMasahiro Yamada $(Q)$(MAKE) $(build)=scripts/gdb 1567 8d2e5200SMasahiro Yamada $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1568 67274c08SMasahiro Yamada 1569 67274c08SMasahiro Yamadaifdef CONFIG_GDB_SCRIPTS 1570 67274c08SMasahiro Yamadaall: scripts_gdb 1571 67274c08SMasahiro Yamadaendif 1572 67274c08SMasahiro Yamada 1573 1da177e4SLinus Torvaldselse # KBUILD_EXTMOD 1574 1da177e4SLinus Torvalds 1575 1da177e4SLinus Torvalds### 1576 1da177e4SLinus Torvalds# External module support. 1577 1da177e4SLinus Torvalds# When building external modules the kernel used as basis is considered 1578 1da177e4SLinus Torvalds# read-only, and no consistency checks are made and the make 1579 1da177e4SLinus Torvalds# system is not used on the basis kernel. If updates are required 1580 1da177e4SLinus Torvalds# in the basis kernel ordinary make commands (without M=...) must 1581 1da177e4SLinus Torvalds# be used. 1582 1da177e4SLinus Torvalds# 1583 1da177e4SLinus Torvalds# The following are the only valid targets when building external 1584 1da177e4SLinus Torvalds# modules. 1585 1da177e4SLinus Torvalds# make M=dir clean Delete all automatically generated files 1586 1da177e4SLinus Torvalds# make M=dir modules Make all modules in specified dir 1587 1da177e4SLinus Torvalds# make M=dir Same as 'make M=dir modules' 1588 1da177e4SLinus Torvalds# make M=dir modules_install 1589 070b98bfSSam Ravnborg# Install the modules built in the module directory 1590 1da177e4SLinus Torvalds# Assumes install directory is already created 1591 1da177e4SLinus Torvalds 1592 1da177e4SLinus Torvalds# We are always building modules 1593 1da177e4SLinus TorvaldsKBUILD_MODULES := 1 1594 1da177e4SLinus Torvalds 1595 4f193362SPaul SmithPHONY += $(objtree)/Module.symvers 1596 1da177e4SLinus Torvalds$(objtree)/Module.symvers: 1597 1da177e4SLinus Torvalds @test -e $(objtree)/Module.symvers || ( \ 1598 1da177e4SLinus Torvalds echo; \ 1599 1da177e4SLinus Torvalds echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1600 1da177e4SLinus Torvalds echo " is missing; modules will have no dependencies and modversions."; \ 1601 1da177e4SLinus Torvalds echo ) 1602 1da177e4SLinus Torvalds 1603 c99f3918SMasahiro Yamadabuild-dirs := $(KBUILD_EXTMOD) 1604 c99f3918SMasahiro YamadaPHONY += modules 1605 c99f3918SMasahiro Yamadamodules: descend $(objtree)/Module.symvers 1606 b805aa0eSSam Ravnborg $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1607 1da177e4SLinus Torvalds 1608 4f193362SPaul SmithPHONY += modules_install 1609 a67dc21aSSam Ravnborgmodules_install: _emodinst_ _emodinst_post 1610 a67dc21aSSam Ravnborg 1611 a67dc21aSSam Ravnborginstall-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1612 4f193362SPaul SmithPHONY += _emodinst_ 1613 a67dc21aSSam Ravnborg_emodinst_: 1614 a67dc21aSSam Ravnborg $(Q)mkdir -p $(MODLIB)/$(install-dir) 1615 b805aa0eSSam Ravnborg $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1616 1da177e4SLinus Torvalds 1617 4f193362SPaul SmithPHONY += _emodinst_post 1618 a67dc21aSSam Ravnborg_emodinst_post: _emodinst_ 1619 a67dc21aSSam Ravnborg $(call cmd,depmod) 1620 a67dc21aSSam Ravnborg 1621 76cd306dSMasahiro Yamadaclean-dirs := $(KBUILD_EXTMOD) 1622 88d7be03SMichal Marekclean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1623 1da177e4SLinus Torvalds 1624 d4945049SMasahiro YamadaPHONY += / 1625 d4945049SMasahiro Yamada/: 1626 d4945049SMasahiro Yamada @echo >&2 '"$(MAKE) /" is no longer supported. Please use "$(MAKE) ./" instead.' 1627 d4945049SMasahiro Yamada 1628 fe69b420SMasahiro YamadaPHONY += help 1629 1da177e4SLinus Torvaldshelp: 1630 1da177e4SLinus Torvalds @echo ' Building external modules.' 1631 1da177e4SLinus Torvalds @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1632 1da177e4SLinus Torvalds @echo '' 1633 1da177e4SLinus Torvalds @echo ' modules - default target, build the module(s)' 1634 1da177e4SLinus Torvalds @echo ' modules_install - install the module' 1635 1da177e4SLinus Torvalds @echo ' clean - remove generated files in module directory only' 1636 1da177e4SLinus Torvalds @echo '' 1637 06300b21SSam Ravnborg 1638 059bc9fcSMasahiro YamadaPHONY += prepare 1639 1da177e4SLinus Torvaldsendif # KBUILD_EXTMOD 1640 1da177e4SLinus Torvalds 1641 c99f3918SMasahiro Yamada# Handle descending into subdirectories listed in $(build-dirs) 1642 c99f3918SMasahiro Yamada# Preset locale variables to speed up the build process. Limit locale 1643 c99f3918SMasahiro Yamada# tweaks to this spot to avoid wrong language settings when running 1644 c99f3918SMasahiro Yamada# make menuconfig etc. 1645 c99f3918SMasahiro Yamada# Error messages still appears in the original language 1646 c99f3918SMasahiro YamadaPHONY += descend $(build-dirs) 1647 c99f3918SMasahiro Yamadadescend: $(build-dirs) 1648 c99f3918SMasahiro Yamada$(build-dirs): prepare 1649 394053f4SMasahiro Yamada $(Q)$(MAKE) $(build)=$@ single-build=$(single-build) need-builtin=1 need-modorder=1 1650 c99f3918SMasahiro Yamada 1651 76cd306dSMasahiro Yamadaclean-dirs := $(addprefix _clean_, $(clean-dirs)) 1652 76cd306dSMasahiro YamadaPHONY += $(clean-dirs) clean 1653 76cd306dSMasahiro Yamada$(clean-dirs): 1654 76cd306dSMasahiro Yamada $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1655 76cd306dSMasahiro Yamada 1656 88d7be03SMichal Marekclean: $(clean-dirs) 1657 88d7be03SMichal Marek $(call cmd,rmdirs) 1658 88d7be03SMichal Marek $(call cmd,rmfiles) 1659 43f67c98SKevin Cernekee @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1660 ef46d9b3SMasahiro Yamada \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1661 4f0e3a57SRob Herring -o -name '*.ko.*' \ 1662 4f0e3a57SRob Herring -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1663 ef46d9b3SMasahiro Yamada -o -name '*.dwo' -o -name '*.lst' \ 1664 1d082773SMatthias Maennich -o -name '*.su' -o -name '*.mod' -o -name '*.ns_deps' \ 1665 88d7be03SMichal Marek -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1666 9a8dfb39SMasahiro Yamada -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1667 4fa8bc94SMasahiro Yamada -o -name '*.asn1.[ch]' \ 1668 88d7be03SMichal Marek -o -name '*.symtypes' -o -name 'modules.order' \ 1669 88d7be03SMichal Marek -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1670 6b90bd4bSEmese Revfy -o -name '*.c.[012]*.*' \ 1671 433db3e2SVinÃcius Tinti -o -name '*.ll' \ 1672 88d7be03SMichal Marek -o -name '*.gcno' \) -type f -print | xargs rm -f 1673 88d7be03SMichal Marek 1674 1da177e4SLinus Torvalds# Generate tags for editors 1675 1da177e4SLinus Torvalds# --------------------------------------------------------------------------- 1676 a680eedcSSam Ravnborgquiet_cmd_tags = GEN $@ 1677 858805b3SMasahiro Yamada cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1678 1da177e4SLinus Torvalds 1679 f4ed1009SJianbin Kangtags TAGS cscope gtags: FORCE 1680 1da177e4SLinus Torvalds $(call cmd,tags) 1681 1da177e4SLinus Torvalds 1682 eb8305aeSMatthias Maennich# Script to generate missing namespace dependencies 1683 eb8305aeSMatthias Maennich# --------------------------------------------------------------------------- 1684 eb8305aeSMatthias Maennich 1685 eb8305aeSMatthias MaennichPHONY += nsdeps 1686 eb8305aeSMatthias Maennich 1687 eb8305aeSMatthias Maennichnsdeps: modules 1688 eb8305aeSMatthias Maennich $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost nsdeps 1689 eb8305aeSMatthias Maennich $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1690 eb8305aeSMatthias Maennich 1691 1da177e4SLinus Torvalds# Scripts to check various things for consistency 1692 1da177e4SLinus Torvalds# --------------------------------------------------------------------------- 1693 1da177e4SLinus Torvalds 1694 279f3dd3SPeter FoleyPHONY += includecheck versioncheck coccicheck namespacecheck export_report 1695 279f3dd3SPeter Foley 1696 1da177e4SLinus Torvaldsincludecheck: 1697 436f876cSPeter Foley find $(srctree)/* $(RCS_FIND_IGNORE) \ 1698 1da177e4SLinus Torvalds -name '*.[hcS]' -type f -print | sort \ 1699 80007434SGeert Uytterhoeven | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1700 1da177e4SLinus Torvalds 1701 1da177e4SLinus Torvaldsversioncheck: 1702 2ee2d292SPeter Foley find $(srctree)/* $(RCS_FIND_IGNORE) \ 1703 1da177e4SLinus Torvalds -name '*.[hcS]' -type f -print | sort \ 1704 80007434SGeert Uytterhoeven | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1705 1da177e4SLinus Torvalds 1706 74425eeeSNicolas Palixcoccicheck: 1707 858805b3SMasahiro Yamada $(Q)$(BASH) $(srctree)/scripts/$@ 1708 74425eeeSNicolas Palix 1709 1da177e4SLinus Torvaldsnamespacecheck: 1710 1da177e4SLinus Torvalds $(PERL) $(srctree)/scripts/namespace.pl 1711 1da177e4SLinus Torvalds 1712 295ac051SAdrian Bunkexport_report: 1713 295ac051SAdrian Bunk $(PERL) $(srctree)/scripts/export_report.pl 1714 295ac051SAdrian Bunk 1715 c398ff00SMike MarciniszynPHONY += checkstack kernelrelease kernelversion image_name 1716 e3ccf6e3SJeff Dike 1717 011e3a9aSJeff Dike# UML needs a little special treatment here. It wants to use the host 1718 011e3a9aSJeff Dike# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1719 011e3a9aSJeff Dike# else wants $(ARCH), including people doing cross-builds, which means 1720 011e3a9aSJeff Dike# that $(SUBARCH) doesn't work here. 1721 011e3a9aSJeff Dikeifeq ($(ARCH), um) 1722 011e3a9aSJeff DikeCHECKSTACK_ARCH := $(SUBARCH) 1723 011e3a9aSJeff Dikeelse 1724 011e3a9aSJeff DikeCHECKSTACK_ARCH := $(ARCH) 1725 011e3a9aSJeff Dikeendif 1726 1da177e4SLinus Torvaldscheckstack: 1727 1da177e4SLinus Torvalds $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1728 75dd4747SMasahiro Yamada $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1729 1da177e4SLinus Torvalds 1730 7b8ea53dSAmerigo Wangkernelrelease: 1731 7b8ea53dSAmerigo Wang @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1732 01ab1788SAmerigo Wang 1733 cb58455cSSam Ravnborgkernelversion: 1734 2244cbd8SSam Ravnborg @echo $(KERNELVERSION) 1735 1da177e4SLinus Torvalds 1736 c398ff00SMike Marciniszynimage_name: 1737 c398ff00SMike Marciniszyn @echo $(KBUILD_IMAGE) 1738 c398ff00SMike Marciniszyn 1739 ea01fa9fSBorislav Petkov# Clear a bunch of variables before executing the submake 1740 f47a23ceSMasahiro Yamada 1741 f47a23ceSMasahiro Yamadaifeq ($(quiet),silent_) 1742 f47a23ceSMasahiro Yamadatools_silent=s 1743 f47a23ceSMasahiro Yamadaendif 1744 f47a23ceSMasahiro Yamada 1745 ea01fa9fSBorislav Petkovtools/: FORCE 1746 bf35182fSDavid Howells $(Q)mkdir -p $(objtree)/tools 1747 75dd4747SMasahiro Yamada $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1748 ea01fa9fSBorislav Petkov 1749 ea01fa9fSBorislav Petkovtools/%: FORCE 1750 bf35182fSDavid Howells $(Q)mkdir -p $(objtree)/tools 1751 75dd4747SMasahiro Yamada $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1752 ea01fa9fSBorislav Petkov 1753 06300b21SSam Ravnborg# Single targets 1754 06300b21SSam Ravnborg# --------------------------------------------------------------------------- 1755 394053f4SMasahiro Yamada# To build individual files in subdirectories, you can do like this: 1756 bc2546a6SSam Ravnborg# 1757 394053f4SMasahiro Yamada# make foo/bar/baz.s 1758 394053f4SMasahiro Yamada# 1759 394053f4SMasahiro Yamada# The supported suffixes for single-target are listed in 'single-targets' 1760 394053f4SMasahiro Yamada# 1761 394053f4SMasahiro Yamada# To build only under specific subdirectories, you can do like this: 1762 394053f4SMasahiro Yamada# 1763 394053f4SMasahiro Yamada# make foo/bar/baz/ 1764 06300b21SSam Ravnborg 1765 394053f4SMasahiro Yamadaifdef single-build 1766 06300b21SSam Ravnborg 1767 394053f4SMasahiro Yamadasingle-all := $(filter $(single-targets), $(MAKECMDGOALS)) 1768 394053f4SMasahiro Yamada 1769 394053f4SMasahiro Yamada# .ko is special because modpost is needed 1770 394053f4SMasahiro Yamadasingle-ko := $(sort $(filter %.ko, $(single-all))) 1771 394053f4SMasahiro Yamadasingle-no-ko := $(sort $(patsubst %.ko,%.mod, $(single-all))) 1772 394053f4SMasahiro Yamada 1773 394053f4SMasahiro Yamada$(single-ko): single_modpost 1774 394053f4SMasahiro Yamada @: 1775 394053f4SMasahiro Yamada$(single-no-ko): descend 1776 394053f4SMasahiro Yamada @: 1777 394053f4SMasahiro Yamada 1778 47801c97SMasahiro Yamadaifeq ($(KBUILD_EXTMOD),) 1779 394053f4SMasahiro Yamada# For the single build of in-tree modules, use a temporary file to avoid 1780 47801c97SMasahiro Yamada# the situation of modules_install installing an invalid modules.order. 1781 394053f4SMasahiro YamadaMODORDER := .modules.tmp 1782 47801c97SMasahiro Yamadaendif 1783 394053f4SMasahiro Yamada 1784 394053f4SMasahiro YamadaPHONY += single_modpost 1785 394053f4SMasahiro Yamadasingle_modpost: $(single-no-ko) 1786 394053f4SMasahiro Yamada $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER) 1787 47801c97SMasahiro Yamada $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1788 bc2546a6SSam Ravnborg 1789 394053f4SMasahiro YamadaKBUILD_MODULES := 1 1790 6d3c94e4SMasahiro Yamada 1791 394053f4SMasahiro Yamadaexport KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko)) 1792 394053f4SMasahiro Yamada 1793 394053f4SMasahiro Yamadasingle-build = $(if $(filter-out $@/, $(single-no-ko)),1) 1794 394053f4SMasahiro Yamada 1795 394053f4SMasahiro Yamadaendif 1796 06300b21SSam Ravnborg 1797 1da177e4SLinus Torvalds# FIXME Should go into a make.lib or something 1798 1da177e4SLinus Torvalds# =========================================================================== 1799 1da177e4SLinus Torvalds 1800 1da177e4SLinus Torvaldsquiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1801 1da177e4SLinus Torvalds cmd_rmdirs = rm -rf $(rm-dirs) 1802 1da177e4SLinus Torvalds 1803 1da177e4SLinus Torvaldsquiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1804 1da177e4SLinus Torvalds cmd_rmfiles = rm -f $(rm-files) 1805 1da177e4SLinus Torvalds 1806 bc3c26feSUwe Kleine-König# Run depmod only if we have System.map and depmod is executable 1807 50a8ec31SSam Ravnborgquiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1808 569658ddSMichal Marek cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1809 5a144a1aSMasahiro Yamada $(KERNELRELEASE) 1810 50a8ec31SSam Ravnborg 1811 392885eeSMasahiro Yamada# read saved command lines for existing targets 1812 392885eeSMasahiro Yamadaexisting-targets := $(wildcard $(sort $(targets))) 1813 1da177e4SLinus Torvalds 1814 b999923cSMasahiro Yamada-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1815 1da177e4SLinus Torvalds 1816 2042b548SMasahiro Yamadaendif # config-targets 1817 2042b548SMasahiro Yamadaendif # mixed-build 1818 688931a5SMasahiro Yamadaendif # need-sub-make 1819 1da177e4SLinus Torvalds 1820 4f193362SPaul SmithPHONY += FORCE 1821 1da177e4SLinus TorvaldsFORCE: 1822 4f193362SPaul Smith 1823 bd412d81SUlf Magnusson# Declare the contents of the PHONY variable as phony. We keep that 1824 fe8d0a41SKirill Smelkov# information in a variable so we can use it in if_changed and friends. 1825 4f193362SPaul Smith.PHONY: $(PHONY) 1826