1# SPDX-License-Identifier: GPL-2.0 2VERSION = 4 3PATCHLEVEL = 17 4SUBLEVEL = 0 5EXTRAVERSION = -rc3 6NAME = Fearless Coyote 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 $(version_h) headers_% archheaders archscripts \ 227 kernelversion %src-pkg 228 229config-targets := 0 230mixed-targets := 0 231dot-config := 1 232 233ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 234 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 235 dot-config := 0 236 endif 237endif 238 239ifeq ($(KBUILD_EXTMOD),) 240 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 241 config-targets := 1 242 ifneq ($(words $(MAKECMDGOALS)),1) 243 mixed-targets := 1 244 endif 245 endif 246endif 247 248# For "make -j clean all", "make -j mrproper defconfig all", etc. 249ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 250 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 251 mixed-targets := 1 252 endif 253endif 254 255# install and modules_install need also be processed one by one 256ifneq ($(filter install,$(MAKECMDGOALS)),) 257 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 258 mixed-targets := 1 259 endif 260endif 261 262ifeq ($(mixed-targets),1) 263# =========================================================================== 264# We're called with mixed targets (*config and build targets). 265# Handle them one by one. 266 267PHONY += $(MAKECMDGOALS) __build_one_by_one 268 269$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 270 @: 271 272__build_one_by_one: 273 $(Q)set -e; \ 274 for i in $(MAKECMDGOALS); do \ 275 $(MAKE) -f $(srctree)/Makefile $$i; \ 276 done 277 278else 279 280# We need some generic definitions (do not try to remake the file). 281scripts/Kbuild.include: ; 282include scripts/Kbuild.include 283 284# Read KERNELRELEASE from include/config/kernel.release (if it exists) 285KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 286KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 287export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 288 289# SUBARCH tells the usermode build what the underlying arch is. That is set 290# first, and if a usermode build is happening, the "ARCH=um" on the command 291# line overrides the setting of ARCH below. If a native build is happening, 292# then ARCH is assigned, getting whatever value it gets normally, and 293# SUBARCH is subsequently ignored. 294 295SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \ 296 -e s/sun4u/sparc64/ \ 297 -e s/arm.*/arm/ -e s/sa110/arm/ \ 298 -e s/s390x/s390/ -e s/parisc64/parisc/ \ 299 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \ 300 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \ 301 -e s/riscv.*/riscv/) 302 303# Cross compiling and selecting different set of gcc/bin-utils 304# --------------------------------------------------------------------------- 305# 306# When performing cross compilation for other architectures ARCH shall be set 307# to the target architecture. (See arch/* for the possibilities). 308# ARCH can be set during invocation of make: 309# make ARCH=ia64 310# Another way is to have ARCH set in the environment. 311# The default ARCH is the host where make is executed. 312 313# CROSS_COMPILE specify the prefix used for all executables used 314# during compilation. Only gcc and related bin-utils executables 315# are prefixed with $(CROSS_COMPILE). 316# CROSS_COMPILE can be set on the command line 317# make CROSS_COMPILE=ia64-linux- 318# Alternatively CROSS_COMPILE can be set in the environment. 319# A third alternative is to store a setting in .config so that plain 320# "make" in the configured kernel build directory always uses that. 321# Default value for CROSS_COMPILE is not to prefix executables 322# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 323ARCH ?= $(SUBARCH) 324CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%) 325 326# Architecture as present in compile.h 327UTS_MACHINE := $(ARCH) 328SRCARCH := $(ARCH) 329 330# Additional ARCH settings for x86 331ifeq ($(ARCH),i386) 332 SRCARCH := x86 333endif 334ifeq ($(ARCH),x86_64) 335 SRCARCH := x86 336endif 337 338# Additional ARCH settings for sparc 339ifeq ($(ARCH),sparc32) 340 SRCARCH := sparc 341endif 342ifeq ($(ARCH),sparc64) 343 SRCARCH := sparc 344endif 345 346# Additional ARCH settings for sh 347ifeq ($(ARCH),sh64) 348 SRCARCH := sh 349endif 350 351KCONFIG_CONFIG ?= .config 352export KCONFIG_CONFIG 353 354# SHELL used by kbuild 355CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 356 else if [ -x /bin/bash ]; then echo /bin/bash; \ 357 else echo sh; fi ; fi) 358 359HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS) 360HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS) 361HOST_LFS_LIBS := $(shell getconf LFS_LIBS) 362 363HOSTCC = gcc 364HOSTCXX = g++ 365HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \ 366 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) 367HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) 368HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) 369HOST_LOADLIBES := $(HOST_LFS_LIBS) 370 371# Make variables (CC, etc...) 372AS = $(CROSS_COMPILE)as 373LD = $(CROSS_COMPILE)ld 374CC = $(CROSS_COMPILE)gcc 375CPP = $(CC) -E 376AR = $(CROSS_COMPILE)ar 377NM = $(CROSS_COMPILE)nm 378STRIP = $(CROSS_COMPILE)strip 379OBJCOPY = $(CROSS_COMPILE)objcopy 380OBJDUMP = $(CROSS_COMPILE)objdump 381LEX = flex 382YACC = bison 383AWK = awk 384GENKSYMS = scripts/genksyms/genksyms 385INSTALLKERNEL := installkernel 386DEPMOD = /sbin/depmod 387PERL = perl 388PYTHON = python 389PYTHON2 = python2 390PYTHON3 = python3 391CHECK = sparse 392 393CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 394 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 395NOSTDINC_FLAGS = 396CFLAGS_MODULE = 397AFLAGS_MODULE = 398LDFLAGS_MODULE = 399CFLAGS_KERNEL = 400AFLAGS_KERNEL = 401LDFLAGS_vmlinux = 402 403# Use USERINCLUDE when you must reference the UAPI directories only. 404USERINCLUDE := \ 405 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 406 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 407 -I$(srctree)/include/uapi \ 408 -I$(objtree)/include/generated/uapi \ 409 -include $(srctree)/include/linux/kconfig.h 410 411# Use LINUXINCLUDE when you must reference the include/ directory. 412# Needed to be compatible with the O= option 413LINUXINCLUDE := \ 414 -I$(srctree)/arch/$(SRCARCH)/include \ 415 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 416 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 417 -I$(objtree)/include \ 418 $(USERINCLUDE) 419 420KBUILD_AFLAGS := -D__ASSEMBLY__ 421KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 422 -fno-strict-aliasing -fno-common -fshort-wchar \ 423 -Werror-implicit-function-declaration \ 424 -Wno-format-security \ 425 -std=gnu89 426KBUILD_CPPFLAGS := -D__KERNEL__ 427KBUILD_AFLAGS_KERNEL := 428KBUILD_CFLAGS_KERNEL := 429KBUILD_AFLAGS_MODULE := -DMODULE 430KBUILD_CFLAGS_MODULE := -DMODULE 431KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 432LDFLAGS := 433GCC_PLUGINS_CFLAGS := 434 435export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC 436export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES 437export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE 438export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 439 440export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 441export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 442export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN 443export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 444export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 445export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 446export KBUILD_ARFLAGS 447 448# When compiling out-of-tree modules, put MODVERDIR in the module 449# tree rather than in the kernel tree. The kernel tree might 450# even be read-only. 451export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 452 453# Files to ignore in find ... statements 454 455export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 456 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 457 -prune -o 458export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 459 --exclude CVS --exclude .pc --exclude .hg --exclude .git 460 461# =========================================================================== 462# Rules shared between *config targets and build targets 463 464# Basic helpers built in scripts/basic/ 465PHONY += scripts_basic 466scripts_basic: 467 $(Q)$(MAKE) $(build)=scripts/basic 468 $(Q)rm -f .tmp_quiet_recordmcount 469 470# To avoid any implicit rule to kick in, define an empty command. 471scripts/basic/%: scripts_basic ; 472 473PHONY += outputmakefile 474# outputmakefile generates a Makefile in the output directory, if using a 475# separate output directory. This allows convenient use of make in the 476# output directory. 477outputmakefile: 478ifneq ($(KBUILD_SRC),) 479 $(Q)ln -fsn $(srctree) source 480 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 481 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 482endif 483 484ifeq ($(cc-name),clang) 485ifneq ($(CROSS_COMPILE),) 486CLANG_TARGET := --target=$(notdir $(CROSS_COMPILE:%-=%)) 487GCC_TOOLCHAIN := $(realpath $(dir $(shell which $(LD)))/..) 488endif 489ifneq ($(GCC_TOOLCHAIN),) 490CLANG_GCC_TC := --gcc-toolchain=$(GCC_TOOLCHAIN) 491endif 492KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 493KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 494KBUILD_CFLAGS += $(call cc-option, -no-integrated-as) 495KBUILD_AFLAGS += $(call cc-option, -no-integrated-as) 496endif 497 498RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 499RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 500RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 501export RETPOLINE_CFLAGS 502 503# check for 'asm goto' 504ifeq ($(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y) 505 CC_HAVE_ASM_GOTO := 1 506 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 507 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO 508endif 509 510ifeq ($(config-targets),1) 511# =========================================================================== 512# *config targets only - make sure prerequisites are updated, and descend 513# in scripts/kconfig to make the *config target 514 515# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 516# KBUILD_DEFCONFIG may point out an alternative default configuration 517# used for 'make defconfig' 518include arch/$(SRCARCH)/Makefile 519export KBUILD_DEFCONFIG KBUILD_KCONFIG 520 521config: scripts_basic outputmakefile FORCE 522 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 523 524%config: scripts_basic outputmakefile FORCE 525 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 526 527else 528# =========================================================================== 529# Build targets only - this includes vmlinux, arch specific targets, clean 530# targets and others. In general all targets except *config targets. 531 532# If building an external module we do not care about the all: rule 533# but instead _all depend on modules 534PHONY += all 535ifeq ($(KBUILD_EXTMOD),) 536_all: all 537else 538_all: modules 539endif 540 541# Decide whether to build built-in, modular, or both. 542# Normally, just do built-in. 543 544KBUILD_MODULES := 545KBUILD_BUILTIN := 1 546 547# If we have only "make modules", don't compile built-in objects. 548# When we're building modules with modversions, we need to consider 549# the built-in objects during the descend as well, in order to 550# make sure the checksums are up to date before we record them. 551 552ifeq ($(MAKECMDGOALS),modules) 553 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 554endif 555 556# If we have "make <whatever> modules", compile modules 557# in addition to whatever we do anyway. 558# Just "make" or "make all" shall build modules as well 559 560ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 561 KBUILD_MODULES := 1 562endif 563 564ifeq ($(MAKECMDGOALS),) 565 KBUILD_MODULES := 1 566endif 567 568export KBUILD_MODULES KBUILD_BUILTIN 569 570ifeq ($(KBUILD_EXTMOD),) 571# Objects we will link into vmlinux / subdirs we need to visit 572init-y := init/ 573drivers-y := drivers/ sound/ firmware/ 574net-y := net/ 575libs-y := lib/ 576core-y := usr/ 577virt-y := virt/ 578endif # KBUILD_EXTMOD 579 580ifeq ($(dot-config),1) 581# Read in config 582-include include/config/auto.conf 583 584ifeq ($(KBUILD_EXTMOD),) 585# Read in dependencies to all Kconfig* files, make sure to run 586# oldconfig if changes are detected. 587-include include/config/auto.conf.cmd 588 589# To avoid any implicit rule to kick in, define an empty command 590$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 591 592# The actual configuration files used during the build are stored in 593# include/generated/ and include/config/. Update them if .config is newer than 594# include/config/auto.conf (which mirrors .config). 595include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 596 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 597else 598# external modules needs include/generated/autoconf.h and include/config/auto.conf 599# but do not care if they are up-to-date. Use auto.conf to trigger the test 600PHONY += include/config/auto.conf 601 602include/config/auto.conf: 603 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 604 echo >&2; \ 605 echo >&2 " ERROR: Kernel configuration is invalid."; \ 606 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 607 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 608 echo >&2 ; \ 609 /bin/false) 610 611endif # KBUILD_EXTMOD 612 613else 614# Dummy target needed, because used as prerequisite 615include/config/auto.conf: ; 616endif # $(dot-config) 617 618# The all: target is the default when no target is given on the 619# command line. 620# This allow a user to issue only 'make' to build a kernel including modules 621# Defaults to vmlinux, but the arch makefile usually adds further targets 622all: vmlinux 623 624KBUILD_CFLAGS += $(call cc-option,-fno-PIE) 625KBUILD_AFLAGS += $(call cc-option,-fno-PIE) 626CFLAGS_GCOV := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,) 627export CFLAGS_GCOV CFLAGS_KCOV 628 629# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 630# values of the respective KBUILD_* variables 631ARCH_CPPFLAGS := 632ARCH_AFLAGS := 633ARCH_CFLAGS := 634include arch/$(SRCARCH)/Makefile 635 636KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 637KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 638KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 639KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 640KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context) 641 642ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 643KBUILD_CFLAGS += $(call cc-option,-Oz,-Os) 644KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,) 645else 646ifdef CONFIG_PROFILE_ALL_BRANCHES 647KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,) 648else 649KBUILD_CFLAGS += -O2 650endif 651endif 652 653KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \ 654 $(call cc-disable-warning,maybe-uninitialized,)) 655 656# Tell gcc to never replace conditional load with a non-conditional one 657KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 658 659include scripts/Makefile.kcov 660include scripts/Makefile.gcc-plugins 661 662ifdef CONFIG_READABLE_ASM 663# Disable optimizations that make assembler listings hard to read. 664# reorder blocks reorders the control in the function 665# ipa clone creates specialized cloned functions 666# partial inlining inlines only parts of functions 667KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 668 $(call cc-option,-fno-ipa-cp-clone,) \ 669 $(call cc-option,-fno-partial-inlining) 670endif 671 672ifneq ($(CONFIG_FRAME_WARN),0) 673KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 674endif 675 676# This selects the stack protector compiler flag. Testing it is delayed 677# until after .config has been reprocessed, in the prepare-compiler-check 678# target. 679ifdef CONFIG_CC_STACKPROTECTOR_AUTO 680 stackp-flag := $(call cc-option,-fstack-protector-strong,$(call cc-option,-fstack-protector)) 681 stackp-name := AUTO 682else 683ifdef CONFIG_CC_STACKPROTECTOR_REGULAR 684 stackp-flag := -fstack-protector 685 stackp-name := REGULAR 686else 687ifdef CONFIG_CC_STACKPROTECTOR_STRONG 688 stackp-flag := -fstack-protector-strong 689 stackp-name := STRONG 690else 691 # If either there is no stack protector for this architecture or 692 # CONFIG_CC_STACKPROTECTOR_NONE is selected, we're done, and $(stackp-name) 693 # is empty, skipping all remaining stack protector tests. 694 # 695 # Force off for distro compilers that enable stack protector by default. 696 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector) 697endif 698endif 699endif 700# Find arch-specific stack protector compiler sanity-checking script. 701ifdef stackp-name 702ifneq ($(stackp-flag),) 703 stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh 704 stackp-check := $(wildcard $(stackp-path)) 705 # If the wildcard test matches a test script, run it to check functionality. 706 ifdef stackp-check 707 ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y) 708 stackp-broken := y 709 endif 710 endif 711 ifndef stackp-broken 712 # If the stack protector is functional, enable code that depends on it. 713 KBUILD_CPPFLAGS += -DCONFIG_CC_STACKPROTECTOR 714 # Either we've already detected the flag (for AUTO) or we'll fail the 715 # build in the prepare-compiler-check rule (for specific flag). 716 KBUILD_CFLAGS += $(stackp-flag) 717 else 718 # We have to make sure stack protector is unconditionally disabled if 719 # the compiler is broken (in case we're going to continue the build in 720 # AUTO mode). 721 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector) 722 endif 723endif 724endif 725 726ifeq ($(cc-name),clang) 727KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 728KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 729KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 730KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 731# Quiet clang warning: comparison of unsigned expression < 0 is always false 732KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 733# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 734# source of a reference will be _MergedGlobals and not on of the whitelisted names. 735# See modpost pattern 2 736KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 737KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 738else 739 740# These warnings generated too much noise in a regular build. 741# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 742KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 743endif 744 745KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 746ifdef CONFIG_FRAME_POINTER 747KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 748else 749# Some targets (ARM with Thumb2, for example), can't be built with frame 750# pointers. For those, we don't have FUNCTION_TRACER automatically 751# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 752# incompatible with -fomit-frame-pointer with current GCC, so we don't use 753# -fomit-frame-pointer with FUNCTION_TRACER. 754ifndef CONFIG_FUNCTION_TRACER 755KBUILD_CFLAGS += -fomit-frame-pointer 756endif 757endif 758 759KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 760 761ifdef CONFIG_DEBUG_INFO 762ifdef CONFIG_DEBUG_INFO_SPLIT 763KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 764else 765KBUILD_CFLAGS += -g 766endif 767KBUILD_AFLAGS += -Wa,-gdwarf-2 768endif 769ifdef CONFIG_DEBUG_INFO_DWARF4 770KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 771endif 772 773ifdef CONFIG_DEBUG_INFO_REDUCED 774KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 775 $(call cc-option,-fno-var-tracking) 776endif 777 778ifdef CONFIG_FUNCTION_TRACER 779ifndef CC_FLAGS_FTRACE 780CC_FLAGS_FTRACE := -pg 781endif 782export CC_FLAGS_FTRACE 783ifdef CONFIG_HAVE_FENTRY 784CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 785endif 786KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY) 787KBUILD_AFLAGS += $(CC_USING_FENTRY) 788ifdef CONFIG_DYNAMIC_FTRACE 789 ifdef CONFIG_HAVE_C_RECORDMCOUNT 790 BUILD_C_RECORDMCOUNT := y 791 export BUILD_C_RECORDMCOUNT 792 endif 793endif 794endif 795 796# We trigger additional mismatches with less inlining 797ifdef CONFIG_DEBUG_SECTION_MISMATCH 798KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 799endif 800 801ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 802KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,) 803KBUILD_CFLAGS += $(call cc-option,-fdata-sections,) 804endif 805 806# arch Makefile may override CC so keep this after arch Makefile is included 807NOSTDINC_FLAGS += -nostdinc -isystem $(call shell-cached,$(CC) -print-file-name=include) 808CHECKFLAGS += $(NOSTDINC_FLAGS) 809 810# warn about C99 declaration after statement 811KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 812 813# disable pointer signed / unsigned warnings in gcc 4.0 814KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 815 816# disable invalid "can't wrap" optimizations for signed / pointers 817KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 818 819# clang sets -fmerge-all-constants by default as optimization, but this 820# is non-conforming behavior for C and in fact breaks the kernel, so we 821# need to disable it here generally. 822KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 823 824# for gcc -fno-merge-all-constants disables everything, but it is fine 825# to have actual conforming behavior enabled. 826KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 827 828# Make sure -fstack-check isn't enabled (like gentoo apparently did) 829KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 830 831# conserve stack if available 832KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 833 834# disallow errors like 'EXPORT_GPL(foo);' with missing header 835KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 836 837# require functions to have arguments in prototypes, not empty 'int foo()' 838KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 839 840# Prohibit date/time macros, which would make the build non-deterministic 841KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 842 843# enforce correct pointer usage 844KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 845 846# Require designated initializers for all marked structures 847KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 848 849# change __FILE__ to the relative path from the srctree 850KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 851 852# use the deterministic mode of AR if available 853KBUILD_ARFLAGS := $(call ar-option,D) 854 855include scripts/Makefile.kasan 856include scripts/Makefile.extrawarn 857include scripts/Makefile.ubsan 858 859# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 860# last assignments 861KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 862KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 863KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 864 865# Use --build-id when available. 866LDFLAGS_BUILD_ID := $(call ld-option, --build-id) 867KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 868LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 869 870ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 871LDFLAGS_vmlinux += $(call ld-option, --gc-sections,) 872endif 873 874ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 875LDFLAGS_vmlinux += $(call ld-option, -X,) 876endif 877 878# Default kernel image to build when no specific target is given. 879# KBUILD_IMAGE may be overruled on the command line or 880# set in the environment 881# Also any assignments in arch/$(ARCH)/Makefile take precedence over 882# this default value 883export KBUILD_IMAGE ?= vmlinux 884 885# 886# INSTALL_PATH specifies where to place the updated kernel and system map 887# images. Default is /boot, but you can set it to other values 888export INSTALL_PATH ?= /boot 889 890# 891# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 892# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 893# an argument if needed. Otherwise it defaults to the kernel install path 894# 895export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 896 897# 898# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 899# relocations required by build roots. This is not defined in the 900# makefile but the argument can be passed to make if needed. 901# 902 903MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 904export MODLIB 905 906# 907# INSTALL_MOD_STRIP, if defined, will cause modules to be 908# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 909# the default option --strip-debug will be used. Otherwise, 910# INSTALL_MOD_STRIP value will be used as the options to the strip command. 911 912ifdef INSTALL_MOD_STRIP 913ifeq ($(INSTALL_MOD_STRIP),1) 914mod_strip_cmd = $(STRIP) --strip-debug 915else 916mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 917endif # INSTALL_MOD_STRIP=1 918else 919mod_strip_cmd = true 920endif # INSTALL_MOD_STRIP 921export mod_strip_cmd 922 923# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 924# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 925# or CONFIG_MODULE_COMPRESS_XZ. 926 927mod_compress_cmd = true 928ifdef CONFIG_MODULE_COMPRESS 929 ifdef CONFIG_MODULE_COMPRESS_GZIP 930 mod_compress_cmd = gzip -n -f 931 endif # CONFIG_MODULE_COMPRESS_GZIP 932 ifdef CONFIG_MODULE_COMPRESS_XZ 933 mod_compress_cmd = xz -f 934 endif # CONFIG_MODULE_COMPRESS_XZ 935endif # CONFIG_MODULE_COMPRESS 936export mod_compress_cmd 937 938# Select initial ramdisk compression format, default is gzip(1). 939# This shall be used by the dracut(8) tool while creating an initramfs image. 940# 941INITRD_COMPRESS-y := gzip 942INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 943INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 944INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 945INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 946INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 947# do not export INITRD_COMPRESS, since we didn't actually 948# choose a sane default compression above. 949# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 950 951ifdef CONFIG_MODULE_SIG_ALL 952$(eval $(call config_filename,MODULE_SIG_KEY)) 953 954mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 955else 956mod_sign_cmd = true 957endif 958export mod_sign_cmd 959 960ifdef CONFIG_STACK_VALIDATION 961 has_libelf := $(call try-run,\ 962 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0) 963 ifeq ($(has_libelf),1) 964 objtool_target := tools/objtool FORCE 965 else 966 ifdef CONFIG_UNWINDER_ORC 967 $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 968 else 969 $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 970 endif 971 SKIP_STACK_VALIDATION := 1 972 export SKIP_STACK_VALIDATION 973 endif 974endif 975 976 977ifeq ($(KBUILD_EXTMOD),) 978core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 979 980vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 981 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 982 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 983 984vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 985 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-)))) 986 987init-y := $(patsubst %/, %/built-in.a, $(init-y)) 988core-y := $(patsubst %/, %/built-in.a, $(core-y)) 989drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y)) 990net-y := $(patsubst %/, %/built-in.a, $(net-y)) 991libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 992libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y))) 993virt-y := $(patsubst %/, %/built-in.a, $(virt-y)) 994 995# Externally visible symbols (used by link-vmlinux.sh) 996export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 997export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y) 998export KBUILD_VMLINUX_LIBS := $(libs-y1) 999export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1000export LDFLAGS_vmlinux 1001# used by scripts/package/Makefile 1002export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) 1003 1004vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS) 1005 1006# Recurse until adjust_autoksyms.sh is satisfied 1007PHONY += autoksyms_recursive 1008autoksyms_recursive: $(vmlinux-deps) 1009ifdef CONFIG_TRIM_UNUSED_KSYMS 1010 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1011 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1012endif 1013 1014# For the kernel to actually contain only the needed exported symbols, 1015# we have to build modules as well to determine what those symbols are. 1016# (this can be evaluated only once include/config/auto.conf has been included) 1017ifdef CONFIG_TRIM_UNUSED_KSYMS 1018 KBUILD_MODULES := 1 1019endif 1020 1021autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1022 1023$(autoksyms_h): 1024 $(Q)mkdir -p $(dir $@) 1025 $(Q)touch $@ 1026 1027ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1028 1029# Final link of vmlinux with optional arch pass after final link 1030cmd_link-vmlinux = \ 1031 $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1032 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1033 1034vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1035ifdef CONFIG_HEADERS_CHECK 1036 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 1037endif 1038ifdef CONFIG_GDB_SCRIPTS 1039 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1040endif 1041 +$(call if_changed,link-vmlinux) 1042 1043# Build samples along the rest of the kernel 1044ifdef CONFIG_SAMPLES 1045vmlinux-dirs += samples 1046endif 1047 1048# The actual objects are generated when descending, 1049# make sure no implicit rule kicks in 1050$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 1051 1052# Handle descending into subdirectories listed in $(vmlinux-dirs) 1053# Preset locale variables to speed up the build process. Limit locale 1054# tweaks to this spot to avoid wrong language settings when running 1055# make menuconfig etc. 1056# Error messages still appears in the original language 1057 1058PHONY += $(vmlinux-dirs) 1059$(vmlinux-dirs): prepare scripts 1060 $(Q)$(MAKE) $(build)=$@ need-builtin=1 1061 1062define filechk_kernel.release 1063 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1064endef 1065 1066# Store (new) KERNELRELEASE string in include/config/kernel.release 1067include/config/kernel.release: include/config/auto.conf FORCE 1068 $(call filechk,kernel.release) 1069 1070# Additional helpers built in scripts/ 1071# Carefully list dependencies so we do not try to build scripts twice 1072# in parallel 1073PHONY += scripts 1074scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \ 1075 asm-generic gcc-plugins $(autoksyms_h) 1076 $(Q)$(MAKE) $(build)=$(@) 1077 1078# Things we need to do before we recursively start building the kernel 1079# or the modules are listed in "prepare". 1080# A multi level approach is used. prepareN is processed before prepareN-1. 1081# archprepare is used in arch Makefiles and when processed asm symlink, 1082# version.h and scripts_basic is processed / created. 1083 1084# Listed in dependency order 1085PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 1086 1087# prepare3 is used to check if we are building in a separate output directory, 1088# and if so do: 1089# 1) Check that make has not been executed in the kernel src $(srctree) 1090prepare3: include/config/kernel.release 1091ifneq ($(KBUILD_SRC),) 1092 @$(kecho) ' Using $(srctree) as source for kernel' 1093 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 1094 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 1095 echo >&2 " in the '$(srctree)' directory.";\ 1096 /bin/false; \ 1097 fi; 1098endif 1099 1100# prepare2 creates a makefile if using a separate output directory. 1101# From this point forward, .config has been reprocessed, so any rules 1102# that need to depend on updated CONFIG_* values can be checked here. 1103prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic 1104 1105prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1106 include/config/auto.conf 1107 $(cmd_crmodverdir) 1108 1109archprepare: archheaders archscripts prepare1 scripts_basic 1110 1111prepare0: archprepare gcc-plugins 1112 $(Q)$(MAKE) $(build)=. 1113 1114# All the preparing.. 1115prepare: prepare0 prepare-objtool 1116 1117# Support for using generic headers in asm-generic 1118PHONY += asm-generic uapi-asm-generic 1119asm-generic: uapi-asm-generic 1120 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1121 src=asm obj=arch/$(SRCARCH)/include/generated/asm 1122uapi-asm-generic: 1123 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1124 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 1125 1126PHONY += prepare-objtool 1127prepare-objtool: $(objtool_target) 1128 1129# Check for CONFIG flags that require compiler support. Abort the build 1130# after .config has been processed, but before the kernel build starts. 1131# 1132# For security-sensitive CONFIG options, we don't want to fallback and/or 1133# silently change which compiler flags will be used, since that leads to 1134# producing kernels with different security feature characteristics 1135# depending on the compiler used. (For example, "But I selected 1136# CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!") 1137PHONY += prepare-compiler-check 1138prepare-compiler-check: FORCE 1139# Make sure compiler supports requested stack protector flag. 1140ifdef stackp-name 1141 # Warn about CONFIG_CC_STACKPROTECTOR_AUTO having found no option. 1142 ifeq ($(stackp-flag),) 1143 @echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1144 Compiler does not support any known stack-protector >&2 1145 else 1146 # Fail if specifically requested stack protector is missing. 1147 ifeq ($(call cc-option, $(stackp-flag)),) 1148 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1149 $(stackp-flag) not supported by compiler >&2 && exit 1 1150 endif 1151 endif 1152endif 1153# Make sure compiler does not have buggy stack-protector support. If a 1154# specific stack-protector was requested, fail the build, otherwise warn. 1155ifdef stackp-broken 1156 ifeq ($(stackp-name),AUTO) 1157 @echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1158 $(stackp-flag) available but compiler is broken: disabling >&2 1159 else 1160 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1161 $(stackp-flag) available but compiler is broken >&2 && exit 1 1162 endif 1163endif 1164 @: 1165 1166# Generate some files 1167# --------------------------------------------------------------------------- 1168 1169# KERNELRELEASE can change from a few different places, meaning version.h 1170# needs to be updated, so this check is forced on all builds 1171 1172uts_len := 64 1173define filechk_utsrelease.h 1174 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1175 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1176 exit 1; \ 1177 fi; \ 1178 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 1179endef 1180 1181define filechk_version.h 1182 (echo \#define LINUX_VERSION_CODE $(shell \ 1183 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1184 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1185endef 1186 1187$(version_h): $(srctree)/Makefile FORCE 1188 $(call filechk,version.h) 1189 $(Q)rm -f $(old_version_h) 1190 1191include/generated/utsrelease.h: include/config/kernel.release FORCE 1192 $(call filechk,utsrelease.h) 1193 1194PHONY += headerdep 1195headerdep: 1196 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1197 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1198 1199# --------------------------------------------------------------------------- 1200# Kernel headers 1201 1202#Default location for installed headers 1203export INSTALL_HDR_PATH = $(objtree)/usr 1204 1205# If we do an all arch process set dst to include/arch-$(SRCARCH) 1206hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include) 1207 1208PHONY += archheaders 1209archheaders: 1210 1211PHONY += archscripts 1212archscripts: 1213 1214PHONY += __headers 1215__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts 1216 $(Q)$(MAKE) $(build)=scripts build_unifdef 1217 1218PHONY += headers_install_all 1219headers_install_all: 1220 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1221 1222PHONY += headers_install 1223headers_install: __headers 1224 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1225 $(error Headers not exportable for the $(SRCARCH) architecture)) 1226 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include 1227 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) 1228 1229PHONY += headers_check_all 1230headers_check_all: headers_install_all 1231 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1232 1233PHONY += headers_check 1234headers_check: headers_install 1235 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1 1236 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1 1237 1238# --------------------------------------------------------------------------- 1239# Kernel selftest 1240 1241PHONY += kselftest 1242kselftest: 1243 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1244 1245PHONY += kselftest-clean 1246kselftest-clean: 1247 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean 1248 1249PHONY += kselftest-merge 1250kselftest-merge: 1251 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1252 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \ 1253 -m $(objtree)/.config \ 1254 $(srctree)/tools/testing/selftests/*/config 1255 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1256 1257# --------------------------------------------------------------------------- 1258# Modules 1259 1260ifdef CONFIG_MODULES 1261 1262# By default, build modules as well 1263 1264all: modules 1265 1266# Build modules 1267# 1268# A module can be listed more than once in obj-m resulting in 1269# duplicate lines in modules.order files. Those are removed 1270# using awk while concatenating to the final file. 1271 1272PHONY += modules 1273modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1274 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1275 @$(kecho) ' Building modules, stage 2.'; 1276 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1277 1278modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1279 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1280 1281%/modules.builtin: include/config/auto.conf 1282 $(Q)$(MAKE) $(modbuiltin)=$* 1283 1284 1285# Target to prepare building external modules 1286PHONY += modules_prepare 1287modules_prepare: prepare scripts 1288 1289# Target to install modules 1290PHONY += modules_install 1291modules_install: _modinst_ _modinst_post 1292 1293PHONY += _modinst_ 1294_modinst_: 1295 @rm -rf $(MODLIB)/kernel 1296 @rm -f $(MODLIB)/source 1297 @mkdir -p $(MODLIB)/kernel 1298 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1299 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1300 rm -f $(MODLIB)/build ; \ 1301 ln -s $(CURDIR) $(MODLIB)/build ; \ 1302 fi 1303 @cp -f $(objtree)/modules.order $(MODLIB)/ 1304 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1305 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1306 1307# This depmod is only for convenience to give the initial 1308# boot a modules.dep even before / is mounted read-write. However the 1309# boot script depmod is the master version. 1310PHONY += _modinst_post 1311_modinst_post: _modinst_ 1312 $(call cmd,depmod) 1313 1314ifeq ($(CONFIG_MODULE_SIG), y) 1315PHONY += modules_sign 1316modules_sign: 1317 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1318endif 1319 1320else # CONFIG_MODULES 1321 1322# Modules not configured 1323# --------------------------------------------------------------------------- 1324 1325PHONY += modules modules_install 1326modules modules_install: 1327 @echo >&2 1328 @echo >&2 "The present kernel configuration has modules disabled." 1329 @echo >&2 "Type 'make config' and enable loadable module support." 1330 @echo >&2 "Then build a kernel with module support enabled." 1331 @echo >&2 1332 @exit 1 1333 1334endif # CONFIG_MODULES 1335 1336### 1337# Cleaning is done on three levels. 1338# make clean Delete most generated files 1339# Leave enough to build external modules 1340# make mrproper Delete the current configuration, and all generated files 1341# make distclean Remove editor backup files, patch leftover files and the like 1342 1343# Directories & files removed with 'make clean' 1344CLEAN_DIRS += $(MODVERDIR) include/ksym 1345 1346# Directories & files removed with 'make mrproper' 1347MRPROPER_DIRS += include/config usr/include include/generated \ 1348 arch/*/include/generated .tmp_objdiff 1349MRPROPER_FILES += .config .config.old .version \ 1350 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1351 signing_key.pem signing_key.priv signing_key.x509 \ 1352 x509.genkey extra_certificates signing_key.x509.keyid \ 1353 signing_key.x509.signer vmlinux-gdb.py 1354 1355# clean - Delete most, but leave enough to build external modules 1356# 1357clean: rm-dirs := $(CLEAN_DIRS) 1358clean: rm-files := $(CLEAN_FILES) 1359clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1360 1361PHONY += $(clean-dirs) clean archclean vmlinuxclean 1362$(clean-dirs): 1363 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1364 1365vmlinuxclean: 1366 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1367 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1368 1369clean: archclean vmlinuxclean 1370 1371# mrproper - Delete all generated files, including .config 1372# 1373mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1374mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1375mrproper-dirs := $(addprefix _mrproper_,scripts) 1376 1377PHONY += $(mrproper-dirs) mrproper archmrproper 1378$(mrproper-dirs): 1379 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1380 1381mrproper: clean archmrproper $(mrproper-dirs) 1382 $(call cmd,rmdirs) 1383 $(call cmd,rmfiles) 1384 1385# distclean 1386# 1387PHONY += distclean 1388 1389distclean: mrproper 1390 @find $(srctree) $(RCS_FIND_IGNORE) \ 1391 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1392 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1393 -o -name 'core' \) \ 1394 -type f -print | xargs rm -f 1395 1396 1397# Packaging of the kernel to various formats 1398# --------------------------------------------------------------------------- 1399# rpm target kept for backward compatibility 1400package-dir := scripts/package 1401 1402%src-pkg: FORCE 1403 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1404%pkg: include/config/kernel.release FORCE 1405 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1406rpm: rpm-pkg 1407 @echo " WARNING: \"rpm\" target will be removed after Linux 4.18" 1408 @echo " Please use \"rpm-pkg\" instead." 1409 1410 1411# Brief documentation of the typical targets used 1412# --------------------------------------------------------------------------- 1413 1414boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1415boards := $(sort $(notdir $(boards))) 1416board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1417board-dirs := $(sort $(notdir $(board-dirs:/=))) 1418 1419PHONY += help 1420help: 1421 @echo 'Cleaning targets:' 1422 @echo ' clean - Remove most generated files but keep the config and' 1423 @echo ' enough build support to build external modules' 1424 @echo ' mrproper - Remove all generated files + config + various backup files' 1425 @echo ' distclean - mrproper + remove editor backup and patch files' 1426 @echo '' 1427 @echo 'Configuration targets:' 1428 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1429 @echo '' 1430 @echo 'Other generic targets:' 1431 @echo ' all - Build all targets marked with [*]' 1432 @echo '* vmlinux - Build the bare kernel' 1433 @echo '* modules - Build all modules' 1434 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1435 @echo ' dir/ - Build all files in dir and below' 1436 @echo ' dir/file.[ois] - Build specified target only' 1437 @echo ' dir/file.ll - Build the LLVM assembly file' 1438 @echo ' (requires compiler support for LLVM assembly generation)' 1439 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1440 @echo ' (requires a recent binutils and recent build (System.map))' 1441 @echo ' dir/file.ko - Build module including final link' 1442 @echo ' modules_prepare - Set up for building external modules' 1443 @echo ' tags/TAGS - Generate tags file for editors' 1444 @echo ' cscope - Generate cscope index' 1445 @echo ' gtags - Generate GNU GLOBAL index' 1446 @echo ' kernelrelease - Output the release version string (use with make -s)' 1447 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1448 @echo ' image_name - Output the image name (use with make -s)' 1449 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1450 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1451 echo '' 1452 @echo 'Static analysers:' 1453 @echo ' checkstack - Generate a list of stack hogs' 1454 @echo ' namespacecheck - Name space analysis on compiled kernel' 1455 @echo ' versioncheck - Sanity check on version.h usage' 1456 @echo ' includecheck - Check for duplicate included header files' 1457 @echo ' export_report - List the usages of all exported symbols' 1458 @echo ' headers_check - Sanity check on exported headers' 1459 @echo ' headerdep - Detect inclusion cycles in headers' 1460 @echo ' coccicheck - Check with Coccinelle' 1461 @echo '' 1462 @echo 'Kernel selftest:' 1463 @echo ' kselftest - Build and run kernel selftest (run as root)' 1464 @echo ' Build, install, and boot kernel before' 1465 @echo ' running kselftest on it' 1466 @echo ' kselftest-clean - Remove all generated kselftest files' 1467 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' 1468 @echo ' .config.' 1469 @echo '' 1470 @echo 'Userspace tools targets:' 1471 @echo ' use "make tools/help"' 1472 @echo ' or "cd tools; make help"' 1473 @echo '' 1474 @echo 'Kernel packaging:' 1475 @$(MAKE) $(build)=$(package-dir) help 1476 @echo '' 1477 @echo 'Documentation targets:' 1478 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1479 @echo '' 1480 @echo 'Architecture specific targets ($(SRCARCH)):' 1481 @$(if $(archhelp),$(archhelp),\ 1482 echo ' No architecture specific help defined for $(SRCARCH)') 1483 @echo '' 1484 @$(if $(boards), \ 1485 $(foreach b, $(boards), \ 1486 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1487 echo '') 1488 @$(if $(board-dirs), \ 1489 $(foreach b, $(board-dirs), \ 1490 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1491 printf " %-16s - Show all of the above\\n" help-boards; \ 1492 echo '') 1493 1494 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1495 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1496 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1497 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' 1498 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1499 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1500 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1501 @echo ' 1: warnings which may be relevant and do not occur too often' 1502 @echo ' 2: warnings which occur quite often but may still be relevant' 1503 @echo ' 3: more obscure warnings, can most likely be ignored' 1504 @echo ' Multiple levels can be combined with W=12 or W=123' 1505 @echo '' 1506 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1507 @echo 'For further info see the ./README file' 1508 1509 1510help-board-dirs := $(addprefix help-,$(board-dirs)) 1511 1512help-boards: $(help-board-dirs) 1513 1514boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1515 1516$(help-board-dirs): help-%: 1517 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1518 @$(if $(boards-per-dir), \ 1519 $(foreach b, $(boards-per-dir), \ 1520 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1521 echo '') 1522 1523 1524# Documentation targets 1525# --------------------------------------------------------------------------- 1526DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1527 linkcheckdocs dochelp refcheckdocs 1528PHONY += $(DOC_TARGETS) 1529$(DOC_TARGETS): scripts_basic FORCE 1530 $(Q)$(MAKE) $(build)=Documentation $@ 1531 1532else # KBUILD_EXTMOD 1533 1534### 1535# External module support. 1536# When building external modules the kernel used as basis is considered 1537# read-only, and no consistency checks are made and the make 1538# system is not used on the basis kernel. If updates are required 1539# in the basis kernel ordinary make commands (without M=...) must 1540# be used. 1541# 1542# The following are the only valid targets when building external 1543# modules. 1544# make M=dir clean Delete all automatically generated files 1545# make M=dir modules Make all modules in specified dir 1546# make M=dir Same as 'make M=dir modules' 1547# make M=dir modules_install 1548# Install the modules built in the module directory 1549# Assumes install directory is already created 1550 1551# We are always building modules 1552KBUILD_MODULES := 1 1553PHONY += crmodverdir 1554crmodverdir: 1555 $(cmd_crmodverdir) 1556 1557PHONY += $(objtree)/Module.symvers 1558$(objtree)/Module.symvers: 1559 @test -e $(objtree)/Module.symvers || ( \ 1560 echo; \ 1561 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1562 echo " is missing; modules will have no dependencies and modversions."; \ 1563 echo ) 1564 1565module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1566PHONY += $(module-dirs) modules 1567$(module-dirs): crmodverdir $(objtree)/Module.symvers 1568 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1569 1570modules: $(module-dirs) 1571 @$(kecho) ' Building modules, stage 2.'; 1572 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1573 1574PHONY += modules_install 1575modules_install: _emodinst_ _emodinst_post 1576 1577install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1578PHONY += _emodinst_ 1579_emodinst_: 1580 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1581 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1582 1583PHONY += _emodinst_post 1584_emodinst_post: _emodinst_ 1585 $(call cmd,depmod) 1586 1587clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1588 1589PHONY += $(clean-dirs) clean 1590$(clean-dirs): 1591 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1592 1593clean: rm-dirs := $(MODVERDIR) 1594clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1595 1596PHONY += help 1597help: 1598 @echo ' Building external modules.' 1599 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1600 @echo '' 1601 @echo ' modules - default target, build the module(s)' 1602 @echo ' modules_install - install the module' 1603 @echo ' clean - remove generated files in module directory only' 1604 @echo '' 1605 1606# Dummies... 1607PHONY += prepare scripts 1608prepare: ; 1609scripts: ; 1610endif # KBUILD_EXTMOD 1611 1612clean: $(clean-dirs) 1613 $(call cmd,rmdirs) 1614 $(call cmd,rmfiles) 1615 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1616 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1617 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \ 1618 -o -name '*.dwo' -o -name '*.lst' \ 1619 -o -name '*.su' \ 1620 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1621 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1622 -o -name '*.asn1.[ch]' \ 1623 -o -name '*.symtypes' -o -name 'modules.order' \ 1624 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1625 -o -name .cache.mk \ 1626 -o -name '*.c.[012]*.*' \ 1627 -o -name '*.ll' \ 1628 -o -name '*.gcno' \) -type f -print | xargs rm -f 1629 1630# Generate tags for editors 1631# --------------------------------------------------------------------------- 1632quiet_cmd_tags = GEN $@ 1633 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1634 1635tags TAGS cscope gtags: FORCE 1636 $(call cmd,tags) 1637 1638# Scripts to check various things for consistency 1639# --------------------------------------------------------------------------- 1640 1641PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1642 1643includecheck: 1644 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1645 -name '*.[hcS]' -type f -print | sort \ 1646 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1647 1648versioncheck: 1649 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1650 -name '*.[hcS]' -type f -print | sort \ 1651 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1652 1653coccicheck: 1654 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1655 1656namespacecheck: 1657 $(PERL) $(srctree)/scripts/namespace.pl 1658 1659export_report: 1660 $(PERL) $(srctree)/scripts/export_report.pl 1661 1662endif #ifeq ($(config-targets),1) 1663endif #ifeq ($(mixed-targets),1) 1664 1665PHONY += checkstack kernelrelease kernelversion image_name 1666 1667# UML needs a little special treatment here. It wants to use the host 1668# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1669# else wants $(ARCH), including people doing cross-builds, which means 1670# that $(SUBARCH) doesn't work here. 1671ifeq ($(ARCH), um) 1672CHECKSTACK_ARCH := $(SUBARCH) 1673else 1674CHECKSTACK_ARCH := $(ARCH) 1675endif 1676checkstack: 1677 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1678 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1679 1680kernelrelease: 1681 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1682 1683kernelversion: 1684 @echo $(KERNELVERSION) 1685 1686image_name: 1687 @echo $(KBUILD_IMAGE) 1688 1689# Clear a bunch of variables before executing the submake 1690tools/: FORCE 1691 $(Q)mkdir -p $(objtree)/tools 1692 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ 1693 1694tools/%: FORCE 1695 $(Q)mkdir -p $(objtree)/tools 1696 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $* 1697 1698# Single targets 1699# --------------------------------------------------------------------------- 1700# Single targets are compatible with: 1701# - build with mixed source and output 1702# - build with separate output dir 'make O=...' 1703# - external modules 1704# 1705# target-dir => where to store outputfile 1706# build-dir => directory in kernel source tree to use 1707 1708ifeq ($(KBUILD_EXTMOD),) 1709 build-dir = $(patsubst %/,%,$(dir $@)) 1710 target-dir = $(dir $@) 1711else 1712 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1713 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1714 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1715endif 1716 1717%.s: %.c prepare scripts FORCE 1718 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1719%.i: %.c prepare scripts FORCE 1720 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1721%.o: %.c prepare scripts FORCE 1722 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1723%.lst: %.c prepare scripts FORCE 1724 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1725%.s: %.S prepare scripts FORCE 1726 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1727%.o: %.S prepare scripts FORCE 1728 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1729%.symtypes: %.c prepare scripts FORCE 1730 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1731%.ll: %.c prepare scripts FORCE 1732 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1733 1734# Modules 1735/: prepare scripts FORCE 1736 $(cmd_crmodverdir) 1737 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1738 $(build)=$(build-dir) 1739# Make sure the latest headers are built for Documentation 1740Documentation/ samples/: headers_install 1741%/: prepare scripts FORCE 1742 $(cmd_crmodverdir) 1743 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1744 $(build)=$(build-dir) 1745%.ko: prepare scripts FORCE 1746 $(cmd_crmodverdir) 1747 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1748 $(build)=$(build-dir) $(@:.ko=.o) 1749 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1750 1751# FIXME Should go into a make.lib or something 1752# =========================================================================== 1753 1754quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1755 cmd_rmdirs = rm -rf $(rm-dirs) 1756 1757quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1758 cmd_rmfiles = rm -f $(rm-files) 1759 1760# Run depmod only if we have System.map and depmod is executable 1761quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1762 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1763 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))" 1764 1765# Create temporary dir for module support files 1766# clean it up only when building all modules 1767cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1768 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1769 1770# read all saved command lines 1771 1772cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd)) 1773 1774ifneq ($(cmd_files),) 1775 $(cmd_files): ; # Do not try to update included dependency files 1776 include $(cmd_files) 1777endif 1778 1779endif # skip-makefile 1780 1781PHONY += FORCE 1782FORCE: 1783 1784# Declare the contents of the .PHONY variable as phony. We keep that 1785# information in a variable so we can use it in if_changed and friends. 1786.PHONY: $(PHONY) 1787