1# SPDX-License-Identifier: GPL-2.0 2VERSION = 4 3PATCHLEVEL = 19 4SUBLEVEL = 0 5EXTRAVERSION = -rc1 6NAME = Merciless Moray 7 8# *DOCUMENTATION* 9# To see a list of typical targets execute "make help" 10# More info can be located in ./README 11# Comments in this file are targeted only to the developer, do not 12# expect to learn how to build the kernel reading this file. 13 14# That's our default target when none is given on the command line 15PHONY := _all 16_all: 17 18# o Do not use make's built-in rules and variables 19# (this increases performance and avoids hard-to-debug behaviour); 20# o Look for make include files relative to root of kernel src 21MAKEFLAGS += -rR --include-dir=$(CURDIR) 22 23# Avoid funny character set dependencies 24unexport LC_ALL 25LC_COLLATE=C 26LC_NUMERIC=C 27export LC_COLLATE LC_NUMERIC 28 29# Avoid interference with shell env settings 30unexport GREP_OPTIONS 31 32# We are using a recursive build, so we need to do a little thinking 33# to get the ordering right. 34# 35# Most importantly: sub-Makefiles should only ever modify files in 36# their own directory. If in some directory we have a dependency on 37# a file in another dir (which doesn't happen often, but it's often 38# unavoidable when linking the built-in.a targets which finally 39# turn into vmlinux), we will call a sub make in that other dir, and 40# after that we are sure that everything which is in that other dir 41# is now up to date. 42# 43# The only cases where we need to modify files which have global 44# effects are thus separated out and done before the recursive 45# descending is started. They are now explicitly listed as the 46# prepare rule. 47 48# Beautify output 49# --------------------------------------------------------------------------- 50# 51# Normally, we echo the whole command before executing it. By making 52# that echo $($(quiet)$(cmd)), we now have the possibility to set 53# $(quiet) to choose other forms of output instead, e.g. 54# 55# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 56# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 57# 58# If $(quiet) is empty, the whole command will be printed. 59# If it is set to "quiet_", only the short version will be printed. 60# If it is set to "silent_", nothing will be printed at all, since 61# the variable $(silent_cmd_cc_o_c) doesn't exist. 62# 63# A simple variant is to prefix commands with $(Q) - that's useful 64# for commands that shall be hidden in non-verbose mode. 65# 66# $(Q)ln $@ :< 67# 68# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 69# If KBUILD_VERBOSE equals 1 then the above command is displayed. 70# 71# To put more focus on warnings, be less verbose as default 72# Use 'make V=1' to see the full commands 73 74ifeq ("$(origin V)", "command line") 75 KBUILD_VERBOSE = $(V) 76endif 77ifndef KBUILD_VERBOSE 78 KBUILD_VERBOSE = 0 79endif 80 81ifeq ($(KBUILD_VERBOSE),1) 82 quiet = 83 Q = 84else 85 quiet=quiet_ 86 Q = @ 87endif 88 89# If the user is running make -s (silent mode), suppress echoing of 90# commands 91 92ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 93 quiet=silent_ 94 tools_silent=s 95endif 96 97export quiet Q KBUILD_VERBOSE 98 99# kbuild supports saving output files in a separate directory. 100# To locate output files in a separate directory two syntaxes are supported. 101# In both cases the working directory must be the root of the kernel src. 102# 1) O= 103# Use "make O=dir/to/store/output/files/" 104# 105# 2) Set KBUILD_OUTPUT 106# Set the environment variable KBUILD_OUTPUT to point to the directory 107# where the output files shall be placed. 108# export KBUILD_OUTPUT=dir/to/store/output/files/ 109# make 110# 111# The O= assignment takes precedence over the KBUILD_OUTPUT environment 112# variable. 113 114# KBUILD_SRC is not intended to be used by the regular user (for now), 115# it is set on invocation of make with KBUILD_OUTPUT or O= specified. 116ifeq ($(KBUILD_SRC),) 117 118# OK, Make called in directory where kernel src resides 119# Do we want to locate output files in a separate directory? 120ifeq ("$(origin O)", "command line") 121 KBUILD_OUTPUT := $(O) 122endif 123 124# Cancel implicit rules on top Makefile 125$(CURDIR)/Makefile Makefile: ; 126 127ifneq ($(words $(subst :, ,$(CURDIR))), 1) 128 $(error main directory cannot contain spaces nor colons) 129endif 130 131ifneq ($(KBUILD_OUTPUT),) 132# check that the output directory actually exists 133saved-output := $(KBUILD_OUTPUT) 134KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \ 135 && pwd) 136$(if $(KBUILD_OUTPUT),, \ 137 $(error failed to create output directory "$(saved-output)")) 138 139PHONY += $(MAKECMDGOALS) sub-make 140 141$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make 142 @: 143 144# Invoke a second make in the output directory, passing relevant variables 145sub-make: 146 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \ 147 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS)) 148 149# Leave processing to above invocation of make 150skip-makefile := 1 151endif # ifneq ($(KBUILD_OUTPUT),) 152endif # ifeq ($(KBUILD_SRC),) 153 154# We process the rest of the Makefile if this is the final invocation of make 155ifeq ($(skip-makefile),) 156 157# Do not print "Entering directory ...", 158# but we want to display it when entering to the output directory 159# so that IDEs/editors are able to understand relative filenames. 160MAKEFLAGS += --no-print-directory 161 162# Call a source code checker (by default, "sparse") as part of the 163# C compilation. 164# 165# Use 'make C=1' to enable checking of only re-compiled files. 166# Use 'make C=2' to enable checking of *all* source files, regardless 167# of whether they are re-compiled or not. 168# 169# See the file "Documentation/dev-tools/sparse.rst" for more details, 170# including where to get the "sparse" utility. 171 172ifeq ("$(origin C)", "command line") 173 KBUILD_CHECKSRC = $(C) 174endif 175ifndef KBUILD_CHECKSRC 176 KBUILD_CHECKSRC = 0 177endif 178 179# Use make M=dir to specify directory of external module to build 180# Old syntax make ... SUBDIRS=$PWD is still supported 181# Setting the environment variable KBUILD_EXTMOD take precedence 182ifdef SUBDIRS 183 KBUILD_EXTMOD ?= $(SUBDIRS) 184endif 185 186ifeq ("$(origin M)", "command line") 187 KBUILD_EXTMOD := $(M) 188endif 189 190ifeq ($(KBUILD_SRC),) 191 # building in the source tree 192 srctree := . 193else 194 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR))) 195 # building in a subdirectory of the source tree 196 srctree := .. 197 else 198 srctree := $(KBUILD_SRC) 199 endif 200endif 201 202export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC 203 204objtree := . 205src := $(srctree) 206obj := $(objtree) 207 208VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD)) 209 210export srctree objtree VPATH 211 212# To make sure we do not include .config for any of the *config targets 213# catch them early, and hand them over to scripts/kconfig/Makefile 214# It is allowed to specify more targets when calling make, including 215# mixing *config targets and build targets. 216# For example 'make oldconfig all'. 217# Detect when mixed targets is specified, and make a second invocation 218# of make so .config is not included in this case either (for *config). 219 220version_h := include/generated/uapi/linux/version.h 221old_version_h := include/linux/version.h 222 223clean-targets := %clean mrproper cleandocs 224no-dot-config-targets := $(clean-targets) \ 225 cscope gtags TAGS tags help% %docs check% coccicheck \ 226 $(version_h) headers_% archheaders archscripts \ 227 %asm-generic kernelversion %src-pkg 228no-sync-config-targets := $(no-dot-config-targets) install %install \ 229 kernelrelease 230 231config-targets := 0 232mixed-targets := 0 233dot-config := 1 234may-sync-config := 1 235 236ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 237 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 238 dot-config := 0 239 endif 240endif 241 242ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 243 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 244 may-sync-config := 0 245 endif 246endif 247 248ifneq ($(KBUILD_EXTMOD),) 249 may-sync-config := 0 250endif 251 252ifeq ($(KBUILD_EXTMOD),) 253 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 254 config-targets := 1 255 ifneq ($(words $(MAKECMDGOALS)),1) 256 mixed-targets := 1 257 endif 258 endif 259endif 260 261# For "make -j clean all", "make -j mrproper defconfig all", etc. 262ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 263 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 264 mixed-targets := 1 265 endif 266endif 267 268# install and modules_install need also be processed one by one 269ifneq ($(filter install,$(MAKECMDGOALS)),) 270 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 271 mixed-targets := 1 272 endif 273endif 274 275ifeq ($(mixed-targets),1) 276# =========================================================================== 277# We're called with mixed targets (*config and build targets). 278# Handle them one by one. 279 280PHONY += $(MAKECMDGOALS) __build_one_by_one 281 282$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 283 @: 284 285__build_one_by_one: 286 $(Q)set -e; \ 287 for i in $(MAKECMDGOALS); do \ 288 $(MAKE) -f $(srctree)/Makefile $$i; \ 289 done 290 291else 292 293# We need some generic definitions (do not try to remake the file). 294scripts/Kbuild.include: ; 295include scripts/Kbuild.include 296 297# Read KERNELRELEASE from include/config/kernel.release (if it exists) 298KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 299KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 300export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 301 302include scripts/subarch.include 303 304# Cross compiling and selecting different set of gcc/bin-utils 305# --------------------------------------------------------------------------- 306# 307# When performing cross compilation for other architectures ARCH shall be set 308# to the target architecture. (See arch/* for the possibilities). 309# ARCH can be set during invocation of make: 310# make ARCH=ia64 311# Another way is to have ARCH set in the environment. 312# The default ARCH is the host where make is executed. 313 314# CROSS_COMPILE specify the prefix used for all executables used 315# during compilation. Only gcc and related bin-utils executables 316# are prefixed with $(CROSS_COMPILE). 317# CROSS_COMPILE can be set on the command line 318# make CROSS_COMPILE=ia64-linux- 319# Alternatively CROSS_COMPILE can be set in the environment. 320# Default value for CROSS_COMPILE is not to prefix executables 321# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 322ARCH ?= $(SUBARCH) 323 324# Architecture as present in compile.h 325UTS_MACHINE := $(ARCH) 326SRCARCH := $(ARCH) 327 328# Additional ARCH settings for x86 329ifeq ($(ARCH),i386) 330 SRCARCH := x86 331endif 332ifeq ($(ARCH),x86_64) 333 SRCARCH := x86 334endif 335 336# Additional ARCH settings for sparc 337ifeq ($(ARCH),sparc32) 338 SRCARCH := sparc 339endif 340ifeq ($(ARCH),sparc64) 341 SRCARCH := sparc 342endif 343 344# Additional ARCH settings for sh 345ifeq ($(ARCH),sh64) 346 SRCARCH := sh 347endif 348 349KCONFIG_CONFIG ?= .config 350export KCONFIG_CONFIG 351 352# SHELL used by kbuild 353CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 354 else if [ -x /bin/bash ]; then echo /bin/bash; \ 355 else echo sh; fi ; fi) 356 357HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 358HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 359HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 360 361HOSTCC = gcc 362HOSTCXX = g++ 363KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \ 364 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \ 365 $(HOSTCFLAGS) 366KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 367KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 368KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 369 370# Make variables (CC, etc...) 371AS = $(CROSS_COMPILE)as 372LD = $(CROSS_COMPILE)ld 373CC = $(CROSS_COMPILE)gcc 374CPP = $(CC) -E 375AR = $(CROSS_COMPILE)ar 376NM = $(CROSS_COMPILE)nm 377STRIP = $(CROSS_COMPILE)strip 378OBJCOPY = $(CROSS_COMPILE)objcopy 379OBJDUMP = $(CROSS_COMPILE)objdump 380LEX = flex 381YACC = bison 382AWK = awk 383GENKSYMS = scripts/genksyms/genksyms 384INSTALLKERNEL := installkernel 385DEPMOD = /sbin/depmod 386PERL = perl 387PYTHON = python 388PYTHON2 = python2 389PYTHON3 = python3 390CHECK = sparse 391 392CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 393 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 394NOSTDINC_FLAGS = 395CFLAGS_MODULE = 396AFLAGS_MODULE = 397LDFLAGS_MODULE = 398CFLAGS_KERNEL = 399AFLAGS_KERNEL = 400LDFLAGS_vmlinux = 401 402# Use USERINCLUDE when you must reference the UAPI directories only. 403USERINCLUDE := \ 404 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 405 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 406 -I$(srctree)/include/uapi \ 407 -I$(objtree)/include/generated/uapi \ 408 -include $(srctree)/include/linux/kconfig.h 409 410# Use LINUXINCLUDE when you must reference the include/ directory. 411# Needed to be compatible with the O= option 412LINUXINCLUDE := \ 413 -I$(srctree)/arch/$(SRCARCH)/include \ 414 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 415 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 416 -I$(objtree)/include \ 417 $(USERINCLUDE) 418 419KBUILD_AFLAGS := -D__ASSEMBLY__ 420KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 421 -fno-strict-aliasing -fno-common -fshort-wchar \ 422 -Werror-implicit-function-declaration \ 423 -Wno-format-security \ 424 -std=gnu89 425KBUILD_CPPFLAGS := -D__KERNEL__ 426KBUILD_AFLAGS_KERNEL := 427KBUILD_CFLAGS_KERNEL := 428KBUILD_AFLAGS_MODULE := -DMODULE 429KBUILD_CFLAGS_MODULE := -DMODULE 430KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 431KBUILD_LDFLAGS := 432GCC_PLUGINS_CFLAGS := 433 434export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC 435export CPP AR NM STRIP OBJCOPY OBJDUMP KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS 436export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE 437export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 438 439export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 440export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 441export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN 442export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 443export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 444export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 445export KBUILD_ARFLAGS 446 447# When compiling out-of-tree modules, put MODVERDIR in the module 448# tree rather than in the kernel tree. The kernel tree might 449# even be read-only. 450export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 451 452# Files to ignore in find ... statements 453 454export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 455 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 456 -prune -o 457export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 458 --exclude CVS --exclude .pc --exclude .hg --exclude .git 459 460# =========================================================================== 461# Rules shared between *config targets and build targets 462 463# Basic helpers built in scripts/basic/ 464PHONY += scripts_basic 465scripts_basic: 466 $(Q)$(MAKE) $(build)=scripts/basic 467 $(Q)rm -f .tmp_quiet_recordmcount 468 469# To avoid any implicit rule to kick in, define an empty command. 470scripts/basic/%: scripts_basic ; 471 472PHONY += outputmakefile 473# outputmakefile generates a Makefile in the output directory, if using a 474# separate output directory. This allows convenient use of make in the 475# output directory. 476outputmakefile: 477ifneq ($(KBUILD_SRC),) 478 $(Q)ln -fsn $(srctree) source 479 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 480 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 481endif 482 483ifeq ($(cc-name),clang) 484ifneq ($(CROSS_COMPILE),) 485CLANG_TARGET := --target=$(notdir $(CROSS_COMPILE:%-=%)) 486GCC_TOOLCHAIN := $(realpath $(dir $(shell which $(LD)))/..) 487endif 488ifneq ($(GCC_TOOLCHAIN),) 489CLANG_GCC_TC := --gcc-toolchain=$(GCC_TOOLCHAIN) 490endif 491KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 492KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 493KBUILD_CFLAGS += $(call cc-option, -no-integrated-as) 494KBUILD_AFLAGS += $(call cc-option, -no-integrated-as) 495endif 496 497RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 498RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 499RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 500RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 501RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 502RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 503export RETPOLINE_CFLAGS 504export RETPOLINE_VDSO_CFLAGS 505 506KBUILD_CFLAGS += $(call cc-option,-fno-PIE) 507KBUILD_AFLAGS += $(call cc-option,-fno-PIE) 508 509# check for 'asm goto' 510ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y) 511 CC_HAVE_ASM_GOTO := 1 512 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 513 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO 514endif 515 516# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 517# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 518# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 519# and from include/config/auto.conf.cmd to detect the compiler upgrade. 520CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1) 521 522ifeq ($(config-targets),1) 523# =========================================================================== 524# *config targets only - make sure prerequisites are updated, and descend 525# in scripts/kconfig to make the *config target 526 527# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 528# KBUILD_DEFCONFIG may point out an alternative default configuration 529# used for 'make defconfig' 530include arch/$(SRCARCH)/Makefile 531export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 532 533config: scripts_basic outputmakefile FORCE 534 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 535 536%config: scripts_basic outputmakefile FORCE 537 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 538 539else 540# =========================================================================== 541# Build targets only - this includes vmlinux, arch specific targets, clean 542# targets and others. In general all targets except *config targets. 543 544# If building an external module we do not care about the all: rule 545# but instead _all depend on modules 546PHONY += all 547ifeq ($(KBUILD_EXTMOD),) 548_all: all 549else 550_all: modules 551endif 552 553# Decide whether to build built-in, modular, or both. 554# Normally, just do built-in. 555 556KBUILD_MODULES := 557KBUILD_BUILTIN := 1 558 559# If we have only "make modules", don't compile built-in objects. 560# When we're building modules with modversions, we need to consider 561# the built-in objects during the descend as well, in order to 562# make sure the checksums are up to date before we record them. 563 564ifeq ($(MAKECMDGOALS),modules) 565 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 566endif 567 568# If we have "make <whatever> modules", compile modules 569# in addition to whatever we do anyway. 570# Just "make" or "make all" shall build modules as well 571 572ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 573 KBUILD_MODULES := 1 574endif 575 576ifeq ($(MAKECMDGOALS),) 577 KBUILD_MODULES := 1 578endif 579 580export KBUILD_MODULES KBUILD_BUILTIN 581 582ifeq ($(KBUILD_EXTMOD),) 583# Objects we will link into vmlinux / subdirs we need to visit 584init-y := init/ 585drivers-y := drivers/ sound/ firmware/ 586net-y := net/ 587libs-y := lib/ 588core-y := usr/ 589virt-y := virt/ 590endif # KBUILD_EXTMOD 591 592ifeq ($(dot-config),1) 593include include/config/auto.conf 594endif 595 596# The all: target is the default when no target is given on the 597# command line. 598# This allow a user to issue only 'make' to build a kernel including modules 599# Defaults to vmlinux, but the arch makefile usually adds further targets 600all: vmlinux 601 602CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 603 $(call cc-option,-fno-tree-loop-im) \ 604 $(call cc-disable-warning,maybe-uninitialized,) 605export CFLAGS_GCOV 606 607# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 608# values of the respective KBUILD_* variables 609ARCH_CPPFLAGS := 610ARCH_AFLAGS := 611ARCH_CFLAGS := 612include arch/$(SRCARCH)/Makefile 613 614ifeq ($(dot-config),1) 615ifeq ($(may-sync-config),1) 616# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 617# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 618# because some architectures define CROSS_COMPILE there. 619-include include/config/auto.conf.cmd 620 621# To avoid any implicit rule to kick in, define an empty command 622$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 623 624# The actual configuration files used during the build are stored in 625# include/generated/ and include/config/. Update them if .config is newer than 626# include/config/auto.conf (which mirrors .config). 627include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 628 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 629else 630# External modules and some install targets need include/generated/autoconf.h 631# and include/config/auto.conf but do not care if they are up-to-date. 632# Use auto.conf to trigger the test 633PHONY += include/config/auto.conf 634 635include/config/auto.conf: 636 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 637 echo >&2; \ 638 echo >&2 " ERROR: Kernel configuration is invalid."; \ 639 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 640 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 641 echo >&2 ; \ 642 /bin/false) 643 644endif # may-sync-config 645endif # $(dot-config) 646 647KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 648KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 649KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 650KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 651KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context) 652 653ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 654KBUILD_CFLAGS += $(call cc-option,-Oz,-Os) 655KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,) 656else 657ifdef CONFIG_PROFILE_ALL_BRANCHES 658KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,) 659else 660KBUILD_CFLAGS += -O2 661endif 662endif 663 664KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \ 665 $(call cc-disable-warning,maybe-uninitialized,)) 666 667# Tell gcc to never replace conditional load with a non-conditional one 668KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 669 670include scripts/Makefile.kcov 671include scripts/Makefile.gcc-plugins 672 673ifdef CONFIG_READABLE_ASM 674# Disable optimizations that make assembler listings hard to read. 675# reorder blocks reorders the control in the function 676# ipa clone creates specialized cloned functions 677# partial inlining inlines only parts of functions 678KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 679 $(call cc-option,-fno-ipa-cp-clone,) \ 680 $(call cc-option,-fno-partial-inlining) 681endif 682 683ifneq ($(CONFIG_FRAME_WARN),0) 684KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 685endif 686 687stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector 688stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 689stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 690 691KBUILD_CFLAGS += $(stackp-flags-y) 692 693ifeq ($(cc-name),clang) 694KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 695KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 696KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 697KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 698# Quiet clang warning: comparison of unsigned expression < 0 is always false 699KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 700# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 701# source of a reference will be _MergedGlobals and not on of the whitelisted names. 702# See modpost pattern 2 703KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 704KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 705else 706 707# These warnings generated too much noise in a regular build. 708# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 709KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 710endif 711 712KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 713ifdef CONFIG_FRAME_POINTER 714KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 715else 716# Some targets (ARM with Thumb2, for example), can't be built with frame 717# pointers. For those, we don't have FUNCTION_TRACER automatically 718# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 719# incompatible with -fomit-frame-pointer with current GCC, so we don't use 720# -fomit-frame-pointer with FUNCTION_TRACER. 721ifndef CONFIG_FUNCTION_TRACER 722KBUILD_CFLAGS += -fomit-frame-pointer 723endif 724endif 725 726KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 727 728ifdef CONFIG_DEBUG_INFO 729ifdef CONFIG_DEBUG_INFO_SPLIT 730KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 731else 732KBUILD_CFLAGS += -g 733endif 734KBUILD_AFLAGS += -Wa,-gdwarf-2 735endif 736ifdef CONFIG_DEBUG_INFO_DWARF4 737KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 738endif 739 740ifdef CONFIG_DEBUG_INFO_REDUCED 741KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 742 $(call cc-option,-fno-var-tracking) 743endif 744 745ifdef CONFIG_FUNCTION_TRACER 746ifndef CC_FLAGS_FTRACE 747CC_FLAGS_FTRACE := -pg 748endif 749ifdef CONFIG_FTRACE_MCOUNT_RECORD 750 # gcc 5 supports generating the mcount tables directly 751 ifeq ($(call cc-option-yn,-mrecord-mcount),y) 752 CC_FLAGS_FTRACE += -mrecord-mcount 753 export CC_USING_RECORD_MCOUNT := 1 754 endif 755 ifdef CONFIG_HAVE_NOP_MCOUNT 756 ifeq ($(call cc-option-yn, -mnop-mcount),y) 757 CC_FLAGS_FTRACE += -mnop-mcount 758 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 759 endif 760 endif 761endif 762ifdef CONFIG_HAVE_FENTRY 763 ifeq ($(call cc-option-yn, -mfentry),y) 764 CC_FLAGS_FTRACE += -mfentry 765 CC_FLAGS_USING += -DCC_USING_FENTRY 766 endif 767endif 768export CC_FLAGS_FTRACE 769KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 770KBUILD_AFLAGS += $(CC_FLAGS_USING) 771ifdef CONFIG_DYNAMIC_FTRACE 772 ifdef CONFIG_HAVE_C_RECORDMCOUNT 773 BUILD_C_RECORDMCOUNT := y 774 export BUILD_C_RECORDMCOUNT 775 endif 776endif 777endif 778 779# We trigger additional mismatches with less inlining 780ifdef CONFIG_DEBUG_SECTION_MISMATCH 781KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 782endif 783 784ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 785KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 786LDFLAGS_vmlinux += --gc-sections 787endif 788 789# arch Makefile may override CC so keep this after arch Makefile is included 790NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 791 792# warn about C99 declaration after statement 793KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 794 795# disable pointer signed / unsigned warnings in gcc 4.0 796KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 797 798# disable invalid "can't wrap" optimizations for signed / pointers 799KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 800 801# clang sets -fmerge-all-constants by default as optimization, but this 802# is non-conforming behavior for C and in fact breaks the kernel, so we 803# need to disable it here generally. 804KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 805 806# for gcc -fno-merge-all-constants disables everything, but it is fine 807# to have actual conforming behavior enabled. 808KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 809 810# Make sure -fstack-check isn't enabled (like gentoo apparently did) 811KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 812 813# conserve stack if available 814KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 815 816# disallow errors like 'EXPORT_GPL(foo);' with missing header 817KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 818 819# require functions to have arguments in prototypes, not empty 'int foo()' 820KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 821 822# Prohibit date/time macros, which would make the build non-deterministic 823KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 824 825# enforce correct pointer usage 826KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 827 828# Require designated initializers for all marked structures 829KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 830 831# change __FILE__ to the relative path from the srctree 832KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 833 834# use the deterministic mode of AR if available 835KBUILD_ARFLAGS := $(call ar-option,D) 836 837include scripts/Makefile.kasan 838include scripts/Makefile.extrawarn 839include scripts/Makefile.ubsan 840 841# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 842# last assignments 843KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 844KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 845KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 846 847# Use --build-id when available. 848LDFLAGS_BUILD_ID := $(call ld-option, --build-id) 849KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 850LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 851 852ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 853LDFLAGS_vmlinux += $(call ld-option, -X,) 854endif 855 856# insure the checker run with the right endianness 857CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 858 859# the checker needs the correct machine size 860CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 861 862# Default kernel image to build when no specific target is given. 863# KBUILD_IMAGE may be overruled on the command line or 864# set in the environment 865# Also any assignments in arch/$(ARCH)/Makefile take precedence over 866# this default value 867export KBUILD_IMAGE ?= vmlinux 868 869# 870# INSTALL_PATH specifies where to place the updated kernel and system map 871# images. Default is /boot, but you can set it to other values 872export INSTALL_PATH ?= /boot 873 874# 875# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 876# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 877# an argument if needed. Otherwise it defaults to the kernel install path 878# 879export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 880 881# 882# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 883# relocations required by build roots. This is not defined in the 884# makefile but the argument can be passed to make if needed. 885# 886 887MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 888export MODLIB 889 890# 891# INSTALL_MOD_STRIP, if defined, will cause modules to be 892# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 893# the default option --strip-debug will be used. Otherwise, 894# INSTALL_MOD_STRIP value will be used as the options to the strip command. 895 896ifdef INSTALL_MOD_STRIP 897ifeq ($(INSTALL_MOD_STRIP),1) 898mod_strip_cmd = $(STRIP) --strip-debug 899else 900mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 901endif # INSTALL_MOD_STRIP=1 902else 903mod_strip_cmd = true 904endif # INSTALL_MOD_STRIP 905export mod_strip_cmd 906 907# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 908# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 909# or CONFIG_MODULE_COMPRESS_XZ. 910 911mod_compress_cmd = true 912ifdef CONFIG_MODULE_COMPRESS 913 ifdef CONFIG_MODULE_COMPRESS_GZIP 914 mod_compress_cmd = gzip -n -f 915 endif # CONFIG_MODULE_COMPRESS_GZIP 916 ifdef CONFIG_MODULE_COMPRESS_XZ 917 mod_compress_cmd = xz -f 918 endif # CONFIG_MODULE_COMPRESS_XZ 919endif # CONFIG_MODULE_COMPRESS 920export mod_compress_cmd 921 922# Select initial ramdisk compression format, default is gzip(1). 923# This shall be used by the dracut(8) tool while creating an initramfs image. 924# 925INITRD_COMPRESS-y := gzip 926INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 927INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 928INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 929INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 930INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 931# do not export INITRD_COMPRESS, since we didn't actually 932# choose a sane default compression above. 933# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 934 935ifdef CONFIG_MODULE_SIG_ALL 936$(eval $(call config_filename,MODULE_SIG_KEY)) 937 938mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 939else 940mod_sign_cmd = true 941endif 942export mod_sign_cmd 943 944ifdef CONFIG_STACK_VALIDATION 945 has_libelf := $(call try-run,\ 946 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0) 947 ifeq ($(has_libelf),1) 948 objtool_target := tools/objtool FORCE 949 else 950 ifdef CONFIG_UNWINDER_ORC 951 $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 952 else 953 $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 954 endif 955 SKIP_STACK_VALIDATION := 1 956 export SKIP_STACK_VALIDATION 957 endif 958endif 959 960 961ifeq ($(KBUILD_EXTMOD),) 962core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 963 964vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 965 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 966 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 967 968vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 969 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-)))) 970 971init-y := $(patsubst %/, %/built-in.a, $(init-y)) 972core-y := $(patsubst %/, %/built-in.a, $(core-y)) 973drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y)) 974net-y := $(patsubst %/, %/built-in.a, $(net-y)) 975libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 976libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y))) 977virt-y := $(patsubst %/, %/built-in.a, $(virt-y)) 978 979# Externally visible symbols (used by link-vmlinux.sh) 980export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 981export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y) 982export KBUILD_VMLINUX_LIBS := $(libs-y1) 983export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 984export LDFLAGS_vmlinux 985# used by scripts/package/Makefile 986export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) 987 988vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS) 989 990# Recurse until adjust_autoksyms.sh is satisfied 991PHONY += autoksyms_recursive 992autoksyms_recursive: $(vmlinux-deps) 993ifdef CONFIG_TRIM_UNUSED_KSYMS 994 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 995 "$(MAKE) -f $(srctree)/Makefile vmlinux" 996endif 997 998# For the kernel to actually contain only the needed exported symbols, 999# we have to build modules as well to determine what those symbols are. 1000# (this can be evaluated only once include/config/auto.conf has been included) 1001ifdef CONFIG_TRIM_UNUSED_KSYMS 1002 KBUILD_MODULES := 1 1003endif 1004 1005autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1006 1007$(autoksyms_h): 1008 $(Q)mkdir -p $(dir $@) 1009 $(Q)touch $@ 1010 1011ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1012 1013# Final link of vmlinux with optional arch pass after final link 1014cmd_link-vmlinux = \ 1015 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1016 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1017 1018vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1019ifdef CONFIG_HEADERS_CHECK 1020 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 1021endif 1022ifdef CONFIG_GDB_SCRIPTS 1023 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1024endif 1025 +$(call if_changed,link-vmlinux) 1026 1027# Build samples along the rest of the kernel. This needs headers_install. 1028ifdef CONFIG_SAMPLES 1029vmlinux-dirs += samples 1030samples: headers_install 1031endif 1032 1033# The actual objects are generated when descending, 1034# make sure no implicit rule kicks in 1035$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 1036 1037# Handle descending into subdirectories listed in $(vmlinux-dirs) 1038# Preset locale variables to speed up the build process. Limit locale 1039# tweaks to this spot to avoid wrong language settings when running 1040# make menuconfig etc. 1041# Error messages still appears in the original language 1042 1043PHONY += $(vmlinux-dirs) 1044$(vmlinux-dirs): prepare scripts 1045 $(Q)$(MAKE) $(build)=$@ need-builtin=1 1046 1047define filechk_kernel.release 1048 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1049endef 1050 1051# Store (new) KERNELRELEASE string in include/config/kernel.release 1052include/config/kernel.release: $(srctree)/Makefile FORCE 1053 $(call filechk,kernel.release) 1054 1055# Additional helpers built in scripts/ 1056# Carefully list dependencies so we do not try to build scripts twice 1057# in parallel 1058PHONY += scripts 1059scripts: scripts_basic asm-generic gcc-plugins $(autoksyms_h) 1060 $(Q)$(MAKE) $(build)=$(@) 1061 1062# Things we need to do before we recursively start building the kernel 1063# or the modules are listed in "prepare". 1064# A multi level approach is used. prepareN is processed before prepareN-1. 1065# archprepare is used in arch Makefiles and when processed asm symlink, 1066# version.h and scripts_basic is processed / created. 1067 1068# Listed in dependency order 1069PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 1070 1071# prepare3 is used to check if we are building in a separate output directory, 1072# and if so do: 1073# 1) Check that make has not been executed in the kernel src $(srctree) 1074prepare3: include/config/kernel.release 1075ifneq ($(KBUILD_SRC),) 1076 @$(kecho) ' Using $(srctree) as source for kernel' 1077 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 1078 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 1079 echo >&2 " in the '$(srctree)' directory.";\ 1080 /bin/false; \ 1081 fi; 1082endif 1083 1084# prepare2 creates a makefile if using a separate output directory. 1085# From this point forward, .config has been reprocessed, so any rules 1086# that need to depend on updated CONFIG_* values can be checked here. 1087prepare2: prepare3 outputmakefile asm-generic 1088 1089prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h 1090 $(cmd_crmodverdir) 1091 1092archprepare: archheaders archscripts prepare1 scripts_basic 1093 1094prepare0: archprepare gcc-plugins 1095 $(Q)$(MAKE) $(build)=. 1096 1097# All the preparing.. 1098prepare: prepare0 prepare-objtool 1099 1100# Support for using generic headers in asm-generic 1101PHONY += asm-generic uapi-asm-generic 1102asm-generic: uapi-asm-generic 1103 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1104 src=asm obj=arch/$(SRCARCH)/include/generated/asm 1105uapi-asm-generic: 1106 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1107 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 1108 1109PHONY += prepare-objtool 1110prepare-objtool: $(objtool_target) 1111 1112# Generate some files 1113# --------------------------------------------------------------------------- 1114 1115# KERNELRELEASE can change from a few different places, meaning version.h 1116# needs to be updated, so this check is forced on all builds 1117 1118uts_len := 64 1119define filechk_utsrelease.h 1120 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1121 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1122 exit 1; \ 1123 fi; \ 1124 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 1125endef 1126 1127define filechk_version.h 1128 (echo \#define LINUX_VERSION_CODE $(shell \ 1129 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1130 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1131endef 1132 1133$(version_h): FORCE 1134 $(call filechk,version.h) 1135 $(Q)rm -f $(old_version_h) 1136 1137include/generated/utsrelease.h: include/config/kernel.release FORCE 1138 $(call filechk,utsrelease.h) 1139 1140PHONY += headerdep 1141headerdep: 1142 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1143 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1144 1145# --------------------------------------------------------------------------- 1146# Kernel headers 1147 1148#Default location for installed headers 1149export INSTALL_HDR_PATH = $(objtree)/usr 1150 1151# If we do an all arch process set dst to include/arch-$(SRCARCH) 1152hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include) 1153 1154PHONY += archheaders 1155archheaders: 1156 1157PHONY += archscripts 1158archscripts: 1159 1160PHONY += __headers 1161__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts 1162 $(Q)$(MAKE) $(build)=scripts build_unifdef 1163 1164PHONY += headers_install_all 1165headers_install_all: 1166 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1167 1168PHONY += headers_install 1169headers_install: __headers 1170 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1171 $(error Headers not exportable for the $(SRCARCH) architecture)) 1172 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include 1173 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) 1174 1175PHONY += headers_check_all 1176headers_check_all: headers_install_all 1177 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1178 1179PHONY += headers_check 1180headers_check: headers_install 1181 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1 1182 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1 1183 1184# --------------------------------------------------------------------------- 1185# Kernel selftest 1186 1187PHONY += kselftest 1188kselftest: 1189 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1190 1191PHONY += kselftest-clean 1192kselftest-clean: 1193 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean 1194 1195PHONY += kselftest-merge 1196kselftest-merge: 1197 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1198 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \ 1199 -m $(objtree)/.config \ 1200 $(srctree)/tools/testing/selftests/*/config 1201 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1202 1203# --------------------------------------------------------------------------- 1204# Modules 1205 1206ifdef CONFIG_MODULES 1207 1208# By default, build modules as well 1209 1210all: modules 1211 1212# Build modules 1213# 1214# A module can be listed more than once in obj-m resulting in 1215# duplicate lines in modules.order files. Those are removed 1216# using awk while concatenating to the final file. 1217 1218PHONY += modules 1219modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1220 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1221 @$(kecho) ' Building modules, stage 2.'; 1222 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1223 1224modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1225 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1226 1227%/modules.builtin: include/config/auto.conf include/config/tristate.conf 1228 $(Q)$(MAKE) $(modbuiltin)=$* 1229 1230 1231# Target to prepare building external modules 1232PHONY += modules_prepare 1233modules_prepare: prepare scripts 1234 1235# Target to install modules 1236PHONY += modules_install 1237modules_install: _modinst_ _modinst_post 1238 1239PHONY += _modinst_ 1240_modinst_: 1241 @rm -rf $(MODLIB)/kernel 1242 @rm -f $(MODLIB)/source 1243 @mkdir -p $(MODLIB)/kernel 1244 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1245 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1246 rm -f $(MODLIB)/build ; \ 1247 ln -s $(CURDIR) $(MODLIB)/build ; \ 1248 fi 1249 @cp -f $(objtree)/modules.order $(MODLIB)/ 1250 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1251 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1252 1253# This depmod is only for convenience to give the initial 1254# boot a modules.dep even before / is mounted read-write. However the 1255# boot script depmod is the master version. 1256PHONY += _modinst_post 1257_modinst_post: _modinst_ 1258 $(call cmd,depmod) 1259 1260ifeq ($(CONFIG_MODULE_SIG), y) 1261PHONY += modules_sign 1262modules_sign: 1263 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1264endif 1265 1266else # CONFIG_MODULES 1267 1268# Modules not configured 1269# --------------------------------------------------------------------------- 1270 1271PHONY += modules modules_install 1272modules modules_install: 1273 @echo >&2 1274 @echo >&2 "The present kernel configuration has modules disabled." 1275 @echo >&2 "Type 'make config' and enable loadable module support." 1276 @echo >&2 "Then build a kernel with module support enabled." 1277 @echo >&2 1278 @exit 1 1279 1280endif # CONFIG_MODULES 1281 1282### 1283# Cleaning is done on three levels. 1284# make clean Delete most generated files 1285# Leave enough to build external modules 1286# make mrproper Delete the current configuration, and all generated files 1287# make distclean Remove editor backup files, patch leftover files and the like 1288 1289# Directories & files removed with 'make clean' 1290CLEAN_DIRS += $(MODVERDIR) include/ksym 1291 1292# Directories & files removed with 'make mrproper' 1293MRPROPER_DIRS += include/config usr/include include/generated \ 1294 arch/*/include/generated .tmp_objdiff 1295MRPROPER_FILES += .config .config.old .version \ 1296 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1297 signing_key.pem signing_key.priv signing_key.x509 \ 1298 x509.genkey extra_certificates signing_key.x509.keyid \ 1299 signing_key.x509.signer vmlinux-gdb.py 1300 1301# clean - Delete most, but leave enough to build external modules 1302# 1303clean: rm-dirs := $(CLEAN_DIRS) 1304clean: rm-files := $(CLEAN_FILES) 1305clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1306 1307PHONY += $(clean-dirs) clean archclean vmlinuxclean 1308$(clean-dirs): 1309 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1310 1311vmlinuxclean: 1312 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1313 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1314 1315clean: archclean vmlinuxclean 1316 1317# mrproper - Delete all generated files, including .config 1318# 1319mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1320mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1321mrproper-dirs := $(addprefix _mrproper_,scripts) 1322 1323PHONY += $(mrproper-dirs) mrproper archmrproper 1324$(mrproper-dirs): 1325 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1326 1327mrproper: clean archmrproper $(mrproper-dirs) 1328 $(call cmd,rmdirs) 1329 $(call cmd,rmfiles) 1330 1331# distclean 1332# 1333PHONY += distclean 1334 1335distclean: mrproper 1336 @find $(srctree) $(RCS_FIND_IGNORE) \ 1337 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1338 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1339 -o -name 'core' \) \ 1340 -type f -print | xargs rm -f 1341 1342 1343# Packaging of the kernel to various formats 1344# --------------------------------------------------------------------------- 1345package-dir := scripts/package 1346 1347%src-pkg: FORCE 1348 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1349%pkg: include/config/kernel.release FORCE 1350 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1351 1352 1353# Brief documentation of the typical targets used 1354# --------------------------------------------------------------------------- 1355 1356boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1357boards := $(sort $(notdir $(boards))) 1358board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1359board-dirs := $(sort $(notdir $(board-dirs:/=))) 1360 1361PHONY += help 1362help: 1363 @echo 'Cleaning targets:' 1364 @echo ' clean - Remove most generated files but keep the config and' 1365 @echo ' enough build support to build external modules' 1366 @echo ' mrproper - Remove all generated files + config + various backup files' 1367 @echo ' distclean - mrproper + remove editor backup and patch files' 1368 @echo '' 1369 @echo 'Configuration targets:' 1370 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1371 @echo '' 1372 @echo 'Other generic targets:' 1373 @echo ' all - Build all targets marked with [*]' 1374 @echo '* vmlinux - Build the bare kernel' 1375 @echo '* modules - Build all modules' 1376 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1377 @echo ' dir/ - Build all files in dir and below' 1378 @echo ' dir/file.[ois] - Build specified target only' 1379 @echo ' dir/file.ll - Build the LLVM assembly file' 1380 @echo ' (requires compiler support for LLVM assembly generation)' 1381 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1382 @echo ' (requires a recent binutils and recent build (System.map))' 1383 @echo ' dir/file.ko - Build module including final link' 1384 @echo ' modules_prepare - Set up for building external modules' 1385 @echo ' tags/TAGS - Generate tags file for editors' 1386 @echo ' cscope - Generate cscope index' 1387 @echo ' gtags - Generate GNU GLOBAL index' 1388 @echo ' kernelrelease - Output the release version string (use with make -s)' 1389 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1390 @echo ' image_name - Output the image name (use with make -s)' 1391 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1392 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1393 echo '' 1394 @echo 'Static analysers:' 1395 @echo ' checkstack - Generate a list of stack hogs' 1396 @echo ' namespacecheck - Name space analysis on compiled kernel' 1397 @echo ' versioncheck - Sanity check on version.h usage' 1398 @echo ' includecheck - Check for duplicate included header files' 1399 @echo ' export_report - List the usages of all exported symbols' 1400 @echo ' headers_check - Sanity check on exported headers' 1401 @echo ' headerdep - Detect inclusion cycles in headers' 1402 @echo ' coccicheck - Check with Coccinelle' 1403 @echo '' 1404 @echo 'Kernel selftest:' 1405 @echo ' kselftest - Build and run kernel selftest (run as root)' 1406 @echo ' Build, install, and boot kernel before' 1407 @echo ' running kselftest on it' 1408 @echo ' kselftest-clean - Remove all generated kselftest files' 1409 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' 1410 @echo ' .config.' 1411 @echo '' 1412 @echo 'Userspace tools targets:' 1413 @echo ' use "make tools/help"' 1414 @echo ' or "cd tools; make help"' 1415 @echo '' 1416 @echo 'Kernel packaging:' 1417 @$(MAKE) $(build)=$(package-dir) help 1418 @echo '' 1419 @echo 'Documentation targets:' 1420 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1421 @echo '' 1422 @echo 'Architecture specific targets ($(SRCARCH)):' 1423 @$(if $(archhelp),$(archhelp),\ 1424 echo ' No architecture specific help defined for $(SRCARCH)') 1425 @echo '' 1426 @$(if $(boards), \ 1427 $(foreach b, $(boards), \ 1428 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1429 echo '') 1430 @$(if $(board-dirs), \ 1431 $(foreach b, $(board-dirs), \ 1432 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1433 printf " %-16s - Show all of the above\\n" help-boards; \ 1434 echo '') 1435 1436 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1437 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1438 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1439 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' 1440 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1441 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1442 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1443 @echo ' 1: warnings which may be relevant and do not occur too often' 1444 @echo ' 2: warnings which occur quite often but may still be relevant' 1445 @echo ' 3: more obscure warnings, can most likely be ignored' 1446 @echo ' Multiple levels can be combined with W=12 or W=123' 1447 @echo '' 1448 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1449 @echo 'For further info see the ./README file' 1450 1451 1452help-board-dirs := $(addprefix help-,$(board-dirs)) 1453 1454help-boards: $(help-board-dirs) 1455 1456boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1457 1458$(help-board-dirs): help-%: 1459 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1460 @$(if $(boards-per-dir), \ 1461 $(foreach b, $(boards-per-dir), \ 1462 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1463 echo '') 1464 1465 1466# Documentation targets 1467# --------------------------------------------------------------------------- 1468DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1469 linkcheckdocs dochelp refcheckdocs 1470PHONY += $(DOC_TARGETS) 1471$(DOC_TARGETS): scripts_basic FORCE 1472 $(Q)$(MAKE) $(build)=Documentation $@ 1473 1474else # KBUILD_EXTMOD 1475 1476### 1477# External module support. 1478# When building external modules the kernel used as basis is considered 1479# read-only, and no consistency checks are made and the make 1480# system is not used on the basis kernel. If updates are required 1481# in the basis kernel ordinary make commands (without M=...) must 1482# be used. 1483# 1484# The following are the only valid targets when building external 1485# modules. 1486# make M=dir clean Delete all automatically generated files 1487# make M=dir modules Make all modules in specified dir 1488# make M=dir Same as 'make M=dir modules' 1489# make M=dir modules_install 1490# Install the modules built in the module directory 1491# Assumes install directory is already created 1492 1493# We are always building modules 1494KBUILD_MODULES := 1 1495PHONY += crmodverdir 1496crmodverdir: 1497 $(cmd_crmodverdir) 1498 1499PHONY += $(objtree)/Module.symvers 1500$(objtree)/Module.symvers: 1501 @test -e $(objtree)/Module.symvers || ( \ 1502 echo; \ 1503 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1504 echo " is missing; modules will have no dependencies and modversions."; \ 1505 echo ) 1506 1507module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1508PHONY += $(module-dirs) modules 1509$(module-dirs): crmodverdir $(objtree)/Module.symvers 1510 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1511 1512modules: $(module-dirs) 1513 @$(kecho) ' Building modules, stage 2.'; 1514 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1515 1516PHONY += modules_install 1517modules_install: _emodinst_ _emodinst_post 1518 1519install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1520PHONY += _emodinst_ 1521_emodinst_: 1522 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1523 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1524 1525PHONY += _emodinst_post 1526_emodinst_post: _emodinst_ 1527 $(call cmd,depmod) 1528 1529clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1530 1531PHONY += $(clean-dirs) clean 1532$(clean-dirs): 1533 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1534 1535clean: rm-dirs := $(MODVERDIR) 1536clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1537 1538PHONY += help 1539help: 1540 @echo ' Building external modules.' 1541 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1542 @echo '' 1543 @echo ' modules - default target, build the module(s)' 1544 @echo ' modules_install - install the module' 1545 @echo ' clean - remove generated files in module directory only' 1546 @echo '' 1547 1548# Dummies... 1549PHONY += prepare scripts 1550prepare: ; 1551scripts: ; 1552endif # KBUILD_EXTMOD 1553 1554clean: $(clean-dirs) 1555 $(call cmd,rmdirs) 1556 $(call cmd,rmfiles) 1557 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1558 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1559 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \ 1560 -o -name '*.dwo' -o -name '*.lst' \ 1561 -o -name '*.su' \ 1562 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1563 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1564 -o -name '*.asn1.[ch]' \ 1565 -o -name '*.symtypes' -o -name 'modules.order' \ 1566 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1567 -o -name '*.c.[012]*.*' \ 1568 -o -name '*.ll' \ 1569 -o -name '*.gcno' \) -type f -print | xargs rm -f 1570 1571# Generate tags for editors 1572# --------------------------------------------------------------------------- 1573quiet_cmd_tags = GEN $@ 1574 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1575 1576tags TAGS cscope gtags: FORCE 1577 $(call cmd,tags) 1578 1579# Scripts to check various things for consistency 1580# --------------------------------------------------------------------------- 1581 1582PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1583 1584includecheck: 1585 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1586 -name '*.[hcS]' -type f -print | sort \ 1587 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1588 1589versioncheck: 1590 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1591 -name '*.[hcS]' -type f -print | sort \ 1592 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1593 1594coccicheck: 1595 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1596 1597namespacecheck: 1598 $(PERL) $(srctree)/scripts/namespace.pl 1599 1600export_report: 1601 $(PERL) $(srctree)/scripts/export_report.pl 1602 1603endif #ifeq ($(config-targets),1) 1604endif #ifeq ($(mixed-targets),1) 1605 1606PHONY += checkstack kernelrelease kernelversion image_name 1607 1608# UML needs a little special treatment here. It wants to use the host 1609# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1610# else wants $(ARCH), including people doing cross-builds, which means 1611# that $(SUBARCH) doesn't work here. 1612ifeq ($(ARCH), um) 1613CHECKSTACK_ARCH := $(SUBARCH) 1614else 1615CHECKSTACK_ARCH := $(ARCH) 1616endif 1617checkstack: 1618 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1619 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1620 1621kernelrelease: 1622 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1623 1624kernelversion: 1625 @echo $(KERNELVERSION) 1626 1627image_name: 1628 @echo $(KBUILD_IMAGE) 1629 1630# Clear a bunch of variables before executing the submake 1631tools/: FORCE 1632 $(Q)mkdir -p $(objtree)/tools 1633 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ 1634 1635tools/%: FORCE 1636 $(Q)mkdir -p $(objtree)/tools 1637 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $* 1638 1639# Single targets 1640# --------------------------------------------------------------------------- 1641# Single targets are compatible with: 1642# - build with mixed source and output 1643# - build with separate output dir 'make O=...' 1644# - external modules 1645# 1646# target-dir => where to store outputfile 1647# build-dir => directory in kernel source tree to use 1648 1649ifeq ($(KBUILD_EXTMOD),) 1650 build-dir = $(patsubst %/,%,$(dir $@)) 1651 target-dir = $(dir $@) 1652else 1653 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1654 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1655 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1656endif 1657 1658%.s: %.c prepare scripts FORCE 1659 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1660%.i: %.c prepare scripts FORCE 1661 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1662%.o: %.c prepare scripts FORCE 1663 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1664%.lst: %.c prepare scripts FORCE 1665 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1666%.s: %.S prepare scripts FORCE 1667 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1668%.o: %.S prepare scripts FORCE 1669 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1670%.symtypes: %.c prepare scripts FORCE 1671 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1672%.ll: %.c prepare scripts FORCE 1673 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1674 1675# Modules 1676/: prepare scripts FORCE 1677 $(cmd_crmodverdir) 1678 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1679 $(build)=$(build-dir) 1680# Make sure the latest headers are built for Documentation 1681Documentation/ samples/: headers_install 1682%/: prepare scripts FORCE 1683 $(cmd_crmodverdir) 1684 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1685 $(build)=$(build-dir) 1686%.ko: prepare scripts FORCE 1687 $(cmd_crmodverdir) 1688 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1689 $(build)=$(build-dir) $(@:.ko=.o) 1690 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1691 1692# FIXME Should go into a make.lib or something 1693# =========================================================================== 1694 1695quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1696 cmd_rmdirs = rm -rf $(rm-dirs) 1697 1698quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1699 cmd_rmfiles = rm -f $(rm-files) 1700 1701# Run depmod only if we have System.map and depmod is executable 1702quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1703 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1704 $(KERNELRELEASE) 1705 1706# Create temporary dir for module support files 1707# clean it up only when building all modules 1708cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1709 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1710 1711# read all saved command lines 1712 1713cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd)) 1714 1715ifneq ($(cmd_files),) 1716 $(cmd_files): ; # Do not try to update included dependency files 1717 include $(cmd_files) 1718endif 1719 1720endif # skip-makefile 1721 1722PHONY += FORCE 1723FORCE: 1724 1725# Declare the contents of the PHONY variable as phony. We keep that 1726# information in a variable so we can use it in if_changed and friends. 1727.PHONY: $(PHONY) 1728