1# SPDX-License-Identifier: GPL-2.0 2VERSION = 4 3PATCHLEVEL = 17 4SUBLEVEL = 0 5EXTRAVERSION = 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 $(version_h) headers_% archheaders archscripts \ 227 kernelversion %src-pkg 228 229config-targets := 0 230mixed-targets := 0 231dot-config := 1 232 233ifneq ($(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 503KBUILD_CFLAGS += $(call cc-option,-fno-PIE) 504KBUILD_AFLAGS += $(call cc-option,-fno-PIE) 505 506# check for 'asm goto' 507ifeq ($(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y) 508 CC_HAVE_ASM_GOTO := 1 509 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 510 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO 511endif 512 513ifeq ($(config-targets),1) 514# =========================================================================== 515# *config targets only - make sure prerequisites are updated, and descend 516# in scripts/kconfig to make the *config target 517 518# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 519# KBUILD_DEFCONFIG may point out an alternative default configuration 520# used for 'make defconfig' 521include arch/$(SRCARCH)/Makefile 522export KBUILD_DEFCONFIG KBUILD_KCONFIG 523 524config: scripts_basic outputmakefile FORCE 525 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 526 527%config: scripts_basic outputmakefile FORCE 528 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 529 530else 531# =========================================================================== 532# Build targets only - this includes vmlinux, arch specific targets, clean 533# targets and others. In general all targets except *config targets. 534 535# If building an external module we do not care about the all: rule 536# but instead _all depend on modules 537PHONY += all 538ifeq ($(KBUILD_EXTMOD),) 539_all: all 540else 541_all: modules 542endif 543 544# Decide whether to build built-in, modular, or both. 545# Normally, just do built-in. 546 547KBUILD_MODULES := 548KBUILD_BUILTIN := 1 549 550# If we have only "make modules", don't compile built-in objects. 551# When we're building modules with modversions, we need to consider 552# the built-in objects during the descend as well, in order to 553# make sure the checksums are up to date before we record them. 554 555ifeq ($(MAKECMDGOALS),modules) 556 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 557endif 558 559# If we have "make <whatever> modules", compile modules 560# in addition to whatever we do anyway. 561# Just "make" or "make all" shall build modules as well 562 563ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 564 KBUILD_MODULES := 1 565endif 566 567ifeq ($(MAKECMDGOALS),) 568 KBUILD_MODULES := 1 569endif 570 571export KBUILD_MODULES KBUILD_BUILTIN 572 573ifeq ($(KBUILD_EXTMOD),) 574# Objects we will link into vmlinux / subdirs we need to visit 575init-y := init/ 576drivers-y := drivers/ sound/ firmware/ 577net-y := net/ 578libs-y := lib/ 579core-y := usr/ 580virt-y := virt/ 581endif # KBUILD_EXTMOD 582 583ifeq ($(dot-config),1) 584# Read in config 585-include include/config/auto.conf 586 587ifeq ($(KBUILD_EXTMOD),) 588# Read in dependencies to all Kconfig* files, make sure to run 589# oldconfig if changes are detected. 590-include include/config/auto.conf.cmd 591 592# To avoid any implicit rule to kick in, define an empty command 593$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 594 595# The actual configuration files used during the build are stored in 596# include/generated/ and include/config/. Update them if .config is newer than 597# include/config/auto.conf (which mirrors .config). 598include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 599 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 600else 601# external modules needs include/generated/autoconf.h and include/config/auto.conf 602# but do not care if they are up-to-date. Use auto.conf to trigger the test 603PHONY += include/config/auto.conf 604 605include/config/auto.conf: 606 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 607 echo >&2; \ 608 echo >&2 " ERROR: Kernel configuration is invalid."; \ 609 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 610 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 611 echo >&2 ; \ 612 /bin/false) 613 614endif # KBUILD_EXTMOD 615 616else 617# Dummy target needed, because used as prerequisite 618include/config/auto.conf: ; 619endif # $(dot-config) 620 621# The all: target is the default when no target is given on the 622# command line. 623# This allow a user to issue only 'make' to build a kernel including modules 624# Defaults to vmlinux, but the arch makefile usually adds further targets 625all: vmlinux 626 627CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 628 $(call cc-option,-fno-tree-loop-im) \ 629 $(call cc-disable-warning,maybe-uninitialized,) 630export CFLAGS_GCOV CFLAGS_KCOV 631 632# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 633# values of the respective KBUILD_* variables 634ARCH_CPPFLAGS := 635ARCH_AFLAGS := 636ARCH_CFLAGS := 637include arch/$(SRCARCH)/Makefile 638 639KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 640KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 641KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 642KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 643KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context) 644 645ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 646KBUILD_CFLAGS += $(call cc-option,-Oz,-Os) 647KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,) 648else 649ifdef CONFIG_PROFILE_ALL_BRANCHES 650KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,) 651else 652KBUILD_CFLAGS += -O2 653endif 654endif 655 656KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \ 657 $(call cc-disable-warning,maybe-uninitialized,)) 658 659# Tell gcc to never replace conditional load with a non-conditional one 660KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 661 662include scripts/Makefile.kcov 663include scripts/Makefile.gcc-plugins 664 665ifdef CONFIG_READABLE_ASM 666# Disable optimizations that make assembler listings hard to read. 667# reorder blocks reorders the control in the function 668# ipa clone creates specialized cloned functions 669# partial inlining inlines only parts of functions 670KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 671 $(call cc-option,-fno-ipa-cp-clone,) \ 672 $(call cc-option,-fno-partial-inlining) 673endif 674 675ifneq ($(CONFIG_FRAME_WARN),0) 676KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 677endif 678 679# This selects the stack protector compiler flag. Testing it is delayed 680# until after .config has been reprocessed, in the prepare-compiler-check 681# target. 682ifdef CONFIG_CC_STACKPROTECTOR_AUTO 683 stackp-flag := $(call cc-option,-fstack-protector-strong,$(call cc-option,-fstack-protector)) 684 stackp-name := AUTO 685else 686ifdef CONFIG_CC_STACKPROTECTOR_REGULAR 687 stackp-flag := -fstack-protector 688 stackp-name := REGULAR 689else 690ifdef CONFIG_CC_STACKPROTECTOR_STRONG 691 stackp-flag := -fstack-protector-strong 692 stackp-name := STRONG 693else 694 # If either there is no stack protector for this architecture or 695 # CONFIG_CC_STACKPROTECTOR_NONE is selected, we're done, and $(stackp-name) 696 # is empty, skipping all remaining stack protector tests. 697 # 698 # Force off for distro compilers that enable stack protector by default. 699 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector) 700endif 701endif 702endif 703# Find arch-specific stack protector compiler sanity-checking script. 704ifdef stackp-name 705ifneq ($(stackp-flag),) 706 stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh 707 stackp-check := $(wildcard $(stackp-path)) 708 # If the wildcard test matches a test script, run it to check functionality. 709 ifdef stackp-check 710 ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y) 711 stackp-broken := y 712 endif 713 endif 714 ifndef stackp-broken 715 # If the stack protector is functional, enable code that depends on it. 716 KBUILD_CPPFLAGS += -DCONFIG_CC_STACKPROTECTOR 717 # Either we've already detected the flag (for AUTO) or we'll fail the 718 # build in the prepare-compiler-check rule (for specific flag). 719 KBUILD_CFLAGS += $(stackp-flag) 720 else 721 # We have to make sure stack protector is unconditionally disabled if 722 # the compiler is broken (in case we're going to continue the build in 723 # AUTO mode). 724 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector) 725 endif 726endif 727endif 728 729ifeq ($(cc-name),clang) 730KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 731KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 732KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 733KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 734# Quiet clang warning: comparison of unsigned expression < 0 is always false 735KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 736# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 737# source of a reference will be _MergedGlobals and not on of the whitelisted names. 738# See modpost pattern 2 739KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 740KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 741else 742 743# These warnings generated too much noise in a regular build. 744# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 745KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 746endif 747 748KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 749ifdef CONFIG_FRAME_POINTER 750KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 751else 752# Some targets (ARM with Thumb2, for example), can't be built with frame 753# pointers. For those, we don't have FUNCTION_TRACER automatically 754# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 755# incompatible with -fomit-frame-pointer with current GCC, so we don't use 756# -fomit-frame-pointer with FUNCTION_TRACER. 757ifndef CONFIG_FUNCTION_TRACER 758KBUILD_CFLAGS += -fomit-frame-pointer 759endif 760endif 761 762KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 763 764ifdef CONFIG_DEBUG_INFO 765ifdef CONFIG_DEBUG_INFO_SPLIT 766KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 767else 768KBUILD_CFLAGS += -g 769endif 770KBUILD_AFLAGS += -Wa,-gdwarf-2 771endif 772ifdef CONFIG_DEBUG_INFO_DWARF4 773KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 774endif 775 776ifdef CONFIG_DEBUG_INFO_REDUCED 777KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 778 $(call cc-option,-fno-var-tracking) 779endif 780 781ifdef CONFIG_FUNCTION_TRACER 782ifndef CC_FLAGS_FTRACE 783CC_FLAGS_FTRACE := -pg 784endif 785export CC_FLAGS_FTRACE 786ifdef CONFIG_HAVE_FENTRY 787CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 788endif 789KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY) 790KBUILD_AFLAGS += $(CC_USING_FENTRY) 791ifdef CONFIG_DYNAMIC_FTRACE 792 ifdef CONFIG_HAVE_C_RECORDMCOUNT 793 BUILD_C_RECORDMCOUNT := y 794 export BUILD_C_RECORDMCOUNT 795 endif 796endif 797endif 798 799# We trigger additional mismatches with less inlining 800ifdef CONFIG_DEBUG_SECTION_MISMATCH 801KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 802endif 803 804ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 805KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,) 806KBUILD_CFLAGS += $(call cc-option,-fdata-sections,) 807endif 808 809# arch Makefile may override CC so keep this after arch Makefile is included 810NOSTDINC_FLAGS += -nostdinc -isystem $(call shell-cached,$(CC) -print-file-name=include) 811CHECKFLAGS += $(NOSTDINC_FLAGS) 812 813# warn about C99 declaration after statement 814KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 815 816# disable pointer signed / unsigned warnings in gcc 4.0 817KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 818 819# disable invalid "can't wrap" optimizations for signed / pointers 820KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 821 822# clang sets -fmerge-all-constants by default as optimization, but this 823# is non-conforming behavior for C and in fact breaks the kernel, so we 824# need to disable it here generally. 825KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 826 827# for gcc -fno-merge-all-constants disables everything, but it is fine 828# to have actual conforming behavior enabled. 829KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 830 831# Make sure -fstack-check isn't enabled (like gentoo apparently did) 832KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 833 834# conserve stack if available 835KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 836 837# disallow errors like 'EXPORT_GPL(foo);' with missing header 838KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 839 840# require functions to have arguments in prototypes, not empty 'int foo()' 841KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 842 843# Prohibit date/time macros, which would make the build non-deterministic 844KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 845 846# enforce correct pointer usage 847KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 848 849# Require designated initializers for all marked structures 850KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 851 852# change __FILE__ to the relative path from the srctree 853KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 854 855# use the deterministic mode of AR if available 856KBUILD_ARFLAGS := $(call ar-option,D) 857 858include scripts/Makefile.kasan 859include scripts/Makefile.extrawarn 860include scripts/Makefile.ubsan 861 862# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 863# last assignments 864KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 865KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 866KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 867 868# Use --build-id when available. 869LDFLAGS_BUILD_ID := $(call ld-option, --build-id) 870KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 871LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 872 873ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 874LDFLAGS_vmlinux += $(call ld-option, --gc-sections,) 875endif 876 877ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 878LDFLAGS_vmlinux += $(call ld-option, -X,) 879endif 880 881# Default kernel image to build when no specific target is given. 882# KBUILD_IMAGE may be overruled on the command line or 883# set in the environment 884# Also any assignments in arch/$(ARCH)/Makefile take precedence over 885# this default value 886export KBUILD_IMAGE ?= vmlinux 887 888# 889# INSTALL_PATH specifies where to place the updated kernel and system map 890# images. Default is /boot, but you can set it to other values 891export INSTALL_PATH ?= /boot 892 893# 894# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 895# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 896# an argument if needed. Otherwise it defaults to the kernel install path 897# 898export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 899 900# 901# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 902# relocations required by build roots. This is not defined in the 903# makefile but the argument can be passed to make if needed. 904# 905 906MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 907export MODLIB 908 909# 910# INSTALL_MOD_STRIP, if defined, will cause modules to be 911# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 912# the default option --strip-debug will be used. Otherwise, 913# INSTALL_MOD_STRIP value will be used as the options to the strip command. 914 915ifdef INSTALL_MOD_STRIP 916ifeq ($(INSTALL_MOD_STRIP),1) 917mod_strip_cmd = $(STRIP) --strip-debug 918else 919mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 920endif # INSTALL_MOD_STRIP=1 921else 922mod_strip_cmd = true 923endif # INSTALL_MOD_STRIP 924export mod_strip_cmd 925 926# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 927# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 928# or CONFIG_MODULE_COMPRESS_XZ. 929 930mod_compress_cmd = true 931ifdef CONFIG_MODULE_COMPRESS 932 ifdef CONFIG_MODULE_COMPRESS_GZIP 933 mod_compress_cmd = gzip -n -f 934 endif # CONFIG_MODULE_COMPRESS_GZIP 935 ifdef CONFIG_MODULE_COMPRESS_XZ 936 mod_compress_cmd = xz -f 937 endif # CONFIG_MODULE_COMPRESS_XZ 938endif # CONFIG_MODULE_COMPRESS 939export mod_compress_cmd 940 941# Select initial ramdisk compression format, default is gzip(1). 942# This shall be used by the dracut(8) tool while creating an initramfs image. 943# 944INITRD_COMPRESS-y := gzip 945INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 946INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 947INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 948INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 949INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 950# do not export INITRD_COMPRESS, since we didn't actually 951# choose a sane default compression above. 952# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 953 954ifdef CONFIG_MODULE_SIG_ALL 955$(eval $(call config_filename,MODULE_SIG_KEY)) 956 957mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 958else 959mod_sign_cmd = true 960endif 961export mod_sign_cmd 962 963ifdef CONFIG_STACK_VALIDATION 964 has_libelf := $(call try-run,\ 965 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0) 966 ifeq ($(has_libelf),1) 967 objtool_target := tools/objtool FORCE 968 else 969 ifdef CONFIG_UNWINDER_ORC 970 $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 971 else 972 $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 973 endif 974 SKIP_STACK_VALIDATION := 1 975 export SKIP_STACK_VALIDATION 976 endif 977endif 978 979 980ifeq ($(KBUILD_EXTMOD),) 981core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 982 983vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 984 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 985 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 986 987vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 988 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-)))) 989 990init-y := $(patsubst %/, %/built-in.a, $(init-y)) 991core-y := $(patsubst %/, %/built-in.a, $(core-y)) 992drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y)) 993net-y := $(patsubst %/, %/built-in.a, $(net-y)) 994libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 995libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y))) 996virt-y := $(patsubst %/, %/built-in.a, $(virt-y)) 997 998# Externally visible symbols (used by link-vmlinux.sh) 999export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 1000export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y) 1001export KBUILD_VMLINUX_LIBS := $(libs-y1) 1002export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1003export LDFLAGS_vmlinux 1004# used by scripts/package/Makefile 1005export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) 1006 1007vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS) 1008 1009# Recurse until adjust_autoksyms.sh is satisfied 1010PHONY += autoksyms_recursive 1011autoksyms_recursive: $(vmlinux-deps) 1012ifdef CONFIG_TRIM_UNUSED_KSYMS 1013 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1014 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1015endif 1016 1017# For the kernel to actually contain only the needed exported symbols, 1018# we have to build modules as well to determine what those symbols are. 1019# (this can be evaluated only once include/config/auto.conf has been included) 1020ifdef CONFIG_TRIM_UNUSED_KSYMS 1021 KBUILD_MODULES := 1 1022endif 1023 1024autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1025 1026$(autoksyms_h): 1027 $(Q)mkdir -p $(dir $@) 1028 $(Q)touch $@ 1029 1030ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1031 1032# Final link of vmlinux with optional arch pass after final link 1033cmd_link-vmlinux = \ 1034 $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1035 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1036 1037vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1038ifdef CONFIG_HEADERS_CHECK 1039 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 1040endif 1041ifdef CONFIG_GDB_SCRIPTS 1042 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1043endif 1044 +$(call if_changed,link-vmlinux) 1045 1046# Build samples along the rest of the kernel 1047ifdef CONFIG_SAMPLES 1048vmlinux-dirs += samples 1049endif 1050 1051# The actual objects are generated when descending, 1052# make sure no implicit rule kicks in 1053$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 1054 1055# Handle descending into subdirectories listed in $(vmlinux-dirs) 1056# Preset locale variables to speed up the build process. Limit locale 1057# tweaks to this spot to avoid wrong language settings when running 1058# make menuconfig etc. 1059# Error messages still appears in the original language 1060 1061PHONY += $(vmlinux-dirs) 1062$(vmlinux-dirs): prepare scripts 1063 $(Q)$(MAKE) $(build)=$@ need-builtin=1 1064 1065define filechk_kernel.release 1066 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1067endef 1068 1069# Store (new) KERNELRELEASE string in include/config/kernel.release 1070include/config/kernel.release: include/config/auto.conf FORCE 1071 $(call filechk,kernel.release) 1072 1073# Additional helpers built in scripts/ 1074# Carefully list dependencies so we do not try to build scripts twice 1075# in parallel 1076PHONY += scripts 1077scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \ 1078 asm-generic gcc-plugins $(autoksyms_h) 1079 $(Q)$(MAKE) $(build)=$(@) 1080 1081# Things we need to do before we recursively start building the kernel 1082# or the modules are listed in "prepare". 1083# A multi level approach is used. prepareN is processed before prepareN-1. 1084# archprepare is used in arch Makefiles and when processed asm symlink, 1085# version.h and scripts_basic is processed / created. 1086 1087# Listed in dependency order 1088PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 1089 1090# prepare3 is used to check if we are building in a separate output directory, 1091# and if so do: 1092# 1) Check that make has not been executed in the kernel src $(srctree) 1093prepare3: include/config/kernel.release 1094ifneq ($(KBUILD_SRC),) 1095 @$(kecho) ' Using $(srctree) as source for kernel' 1096 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 1097 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 1098 echo >&2 " in the '$(srctree)' directory.";\ 1099 /bin/false; \ 1100 fi; 1101endif 1102 1103# prepare2 creates a makefile if using a separate output directory. 1104# From this point forward, .config has been reprocessed, so any rules 1105# that need to depend on updated CONFIG_* values can be checked here. 1106prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic 1107 1108prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1109 include/config/auto.conf 1110 $(cmd_crmodverdir) 1111 1112archprepare: archheaders archscripts prepare1 scripts_basic 1113 1114prepare0: archprepare gcc-plugins 1115 $(Q)$(MAKE) $(build)=. 1116 1117# All the preparing.. 1118prepare: prepare0 prepare-objtool 1119 1120# Support for using generic headers in asm-generic 1121PHONY += asm-generic uapi-asm-generic 1122asm-generic: uapi-asm-generic 1123 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1124 src=asm obj=arch/$(SRCARCH)/include/generated/asm 1125uapi-asm-generic: 1126 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1127 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 1128 1129PHONY += prepare-objtool 1130prepare-objtool: $(objtool_target) 1131 1132# Check for CONFIG flags that require compiler support. Abort the build 1133# after .config has been processed, but before the kernel build starts. 1134# 1135# For security-sensitive CONFIG options, we don't want to fallback and/or 1136# silently change which compiler flags will be used, since that leads to 1137# producing kernels with different security feature characteristics 1138# depending on the compiler used. (For example, "But I selected 1139# CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!") 1140PHONY += prepare-compiler-check 1141prepare-compiler-check: FORCE 1142# Make sure compiler supports requested stack protector flag. 1143ifdef stackp-name 1144 # Warn about CONFIG_CC_STACKPROTECTOR_AUTO having found no option. 1145 ifeq ($(stackp-flag),) 1146 @echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1147 Compiler does not support any known stack-protector >&2 1148 else 1149 # Fail if specifically requested stack protector is missing. 1150 ifeq ($(call cc-option, $(stackp-flag)),) 1151 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1152 $(stackp-flag) not supported by compiler >&2 && exit 1 1153 endif 1154 endif 1155endif 1156# Make sure compiler does not have buggy stack-protector support. If a 1157# specific stack-protector was requested, fail the build, otherwise warn. 1158ifdef stackp-broken 1159 ifeq ($(stackp-name),AUTO) 1160 @echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1161 $(stackp-flag) available but compiler is broken: disabling >&2 1162 else 1163 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1164 $(stackp-flag) available but compiler is broken >&2 && exit 1 1165 endif 1166endif 1167 @: 1168 1169# Generate some files 1170# --------------------------------------------------------------------------- 1171 1172# KERNELRELEASE can change from a few different places, meaning version.h 1173# needs to be updated, so this check is forced on all builds 1174 1175uts_len := 64 1176define filechk_utsrelease.h 1177 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1178 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1179 exit 1; \ 1180 fi; \ 1181 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 1182endef 1183 1184define filechk_version.h 1185 (echo \#define LINUX_VERSION_CODE $(shell \ 1186 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1187 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1188endef 1189 1190$(version_h): $(srctree)/Makefile FORCE 1191 $(call filechk,version.h) 1192 $(Q)rm -f $(old_version_h) 1193 1194include/generated/utsrelease.h: include/config/kernel.release FORCE 1195 $(call filechk,utsrelease.h) 1196 1197PHONY += headerdep 1198headerdep: 1199 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1200 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1201 1202# --------------------------------------------------------------------------- 1203# Kernel headers 1204 1205#Default location for installed headers 1206export INSTALL_HDR_PATH = $(objtree)/usr 1207 1208# If we do an all arch process set dst to include/arch-$(SRCARCH) 1209hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include) 1210 1211PHONY += archheaders 1212archheaders: 1213 1214PHONY += archscripts 1215archscripts: 1216 1217PHONY += __headers 1218__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts 1219 $(Q)$(MAKE) $(build)=scripts build_unifdef 1220 1221PHONY += headers_install_all 1222headers_install_all: 1223 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1224 1225PHONY += headers_install 1226headers_install: __headers 1227 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1228 $(error Headers not exportable for the $(SRCARCH) architecture)) 1229 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include 1230 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) 1231 1232PHONY += headers_check_all 1233headers_check_all: headers_install_all 1234 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1235 1236PHONY += headers_check 1237headers_check: headers_install 1238 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1 1239 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1 1240 1241# --------------------------------------------------------------------------- 1242# Kernel selftest 1243 1244PHONY += kselftest 1245kselftest: 1246 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1247 1248PHONY += kselftest-clean 1249kselftest-clean: 1250 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean 1251 1252PHONY += kselftest-merge 1253kselftest-merge: 1254 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1255 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \ 1256 -m $(objtree)/.config \ 1257 $(srctree)/tools/testing/selftests/*/config 1258 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1259 1260# --------------------------------------------------------------------------- 1261# Modules 1262 1263ifdef CONFIG_MODULES 1264 1265# By default, build modules as well 1266 1267all: modules 1268 1269# Build modules 1270# 1271# A module can be listed more than once in obj-m resulting in 1272# duplicate lines in modules.order files. Those are removed 1273# using awk while concatenating to the final file. 1274 1275PHONY += modules 1276modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1277 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1278 @$(kecho) ' Building modules, stage 2.'; 1279 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1280 1281modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1282 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1283 1284%/modules.builtin: include/config/auto.conf 1285 $(Q)$(MAKE) $(modbuiltin)=$* 1286 1287 1288# Target to prepare building external modules 1289PHONY += modules_prepare 1290modules_prepare: prepare scripts 1291 1292# Target to install modules 1293PHONY += modules_install 1294modules_install: _modinst_ _modinst_post 1295 1296PHONY += _modinst_ 1297_modinst_: 1298 @rm -rf $(MODLIB)/kernel 1299 @rm -f $(MODLIB)/source 1300 @mkdir -p $(MODLIB)/kernel 1301 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1302 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1303 rm -f $(MODLIB)/build ; \ 1304 ln -s $(CURDIR) $(MODLIB)/build ; \ 1305 fi 1306 @cp -f $(objtree)/modules.order $(MODLIB)/ 1307 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1308 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1309 1310# This depmod is only for convenience to give the initial 1311# boot a modules.dep even before / is mounted read-write. However the 1312# boot script depmod is the master version. 1313PHONY += _modinst_post 1314_modinst_post: _modinst_ 1315 $(call cmd,depmod) 1316 1317ifeq ($(CONFIG_MODULE_SIG), y) 1318PHONY += modules_sign 1319modules_sign: 1320 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1321endif 1322 1323else # CONFIG_MODULES 1324 1325# Modules not configured 1326# --------------------------------------------------------------------------- 1327 1328PHONY += modules modules_install 1329modules modules_install: 1330 @echo >&2 1331 @echo >&2 "The present kernel configuration has modules disabled." 1332 @echo >&2 "Type 'make config' and enable loadable module support." 1333 @echo >&2 "Then build a kernel with module support enabled." 1334 @echo >&2 1335 @exit 1 1336 1337endif # CONFIG_MODULES 1338 1339### 1340# Cleaning is done on three levels. 1341# make clean Delete most generated files 1342# Leave enough to build external modules 1343# make mrproper Delete the current configuration, and all generated files 1344# make distclean Remove editor backup files, patch leftover files and the like 1345 1346# Directories & files removed with 'make clean' 1347CLEAN_DIRS += $(MODVERDIR) include/ksym 1348 1349# Directories & files removed with 'make mrproper' 1350MRPROPER_DIRS += include/config usr/include include/generated \ 1351 arch/*/include/generated .tmp_objdiff 1352MRPROPER_FILES += .config .config.old .version \ 1353 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1354 signing_key.pem signing_key.priv signing_key.x509 \ 1355 x509.genkey extra_certificates signing_key.x509.keyid \ 1356 signing_key.x509.signer vmlinux-gdb.py 1357 1358# clean - Delete most, but leave enough to build external modules 1359# 1360clean: rm-dirs := $(CLEAN_DIRS) 1361clean: rm-files := $(CLEAN_FILES) 1362clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1363 1364PHONY += $(clean-dirs) clean archclean vmlinuxclean 1365$(clean-dirs): 1366 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1367 1368vmlinuxclean: 1369 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1370 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1371 1372clean: archclean vmlinuxclean 1373 1374# mrproper - Delete all generated files, including .config 1375# 1376mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1377mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1378mrproper-dirs := $(addprefix _mrproper_,scripts) 1379 1380PHONY += $(mrproper-dirs) mrproper archmrproper 1381$(mrproper-dirs): 1382 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1383 1384mrproper: clean archmrproper $(mrproper-dirs) 1385 $(call cmd,rmdirs) 1386 $(call cmd,rmfiles) 1387 1388# distclean 1389# 1390PHONY += distclean 1391 1392distclean: mrproper 1393 @find $(srctree) $(RCS_FIND_IGNORE) \ 1394 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1395 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1396 -o -name 'core' \) \ 1397 -type f -print | xargs rm -f 1398 1399 1400# Packaging of the kernel to various formats 1401# --------------------------------------------------------------------------- 1402# rpm target kept for backward compatibility 1403package-dir := scripts/package 1404 1405%src-pkg: FORCE 1406 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1407%pkg: include/config/kernel.release FORCE 1408 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1409rpm: rpm-pkg 1410 @echo " WARNING: \"rpm\" target will be removed after Linux 4.18" 1411 @echo " Please use \"rpm-pkg\" instead." 1412 1413 1414# Brief documentation of the typical targets used 1415# --------------------------------------------------------------------------- 1416 1417boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1418boards := $(sort $(notdir $(boards))) 1419board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1420board-dirs := $(sort $(notdir $(board-dirs:/=))) 1421 1422PHONY += help 1423help: 1424 @echo 'Cleaning targets:' 1425 @echo ' clean - Remove most generated files but keep the config and' 1426 @echo ' enough build support to build external modules' 1427 @echo ' mrproper - Remove all generated files + config + various backup files' 1428 @echo ' distclean - mrproper + remove editor backup and patch files' 1429 @echo '' 1430 @echo 'Configuration targets:' 1431 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1432 @echo '' 1433 @echo 'Other generic targets:' 1434 @echo ' all - Build all targets marked with [*]' 1435 @echo '* vmlinux - Build the bare kernel' 1436 @echo '* modules - Build all modules' 1437 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1438 @echo ' dir/ - Build all files in dir and below' 1439 @echo ' dir/file.[ois] - Build specified target only' 1440 @echo ' dir/file.ll - Build the LLVM assembly file' 1441 @echo ' (requires compiler support for LLVM assembly generation)' 1442 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1443 @echo ' (requires a recent binutils and recent build (System.map))' 1444 @echo ' dir/file.ko - Build module including final link' 1445 @echo ' modules_prepare - Set up for building external modules' 1446 @echo ' tags/TAGS - Generate tags file for editors' 1447 @echo ' cscope - Generate cscope index' 1448 @echo ' gtags - Generate GNU GLOBAL index' 1449 @echo ' kernelrelease - Output the release version string (use with make -s)' 1450 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1451 @echo ' image_name - Output the image name (use with make -s)' 1452 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1453 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1454 echo '' 1455 @echo 'Static analysers:' 1456 @echo ' checkstack - Generate a list of stack hogs' 1457 @echo ' namespacecheck - Name space analysis on compiled kernel' 1458 @echo ' versioncheck - Sanity check on version.h usage' 1459 @echo ' includecheck - Check for duplicate included header files' 1460 @echo ' export_report - List the usages of all exported symbols' 1461 @echo ' headers_check - Sanity check on exported headers' 1462 @echo ' headerdep - Detect inclusion cycles in headers' 1463 @echo ' coccicheck - Check with Coccinelle' 1464 @echo '' 1465 @echo 'Kernel selftest:' 1466 @echo ' kselftest - Build and run kernel selftest (run as root)' 1467 @echo ' Build, install, and boot kernel before' 1468 @echo ' running kselftest on it' 1469 @echo ' kselftest-clean - Remove all generated kselftest files' 1470 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' 1471 @echo ' .config.' 1472 @echo '' 1473 @echo 'Userspace tools targets:' 1474 @echo ' use "make tools/help"' 1475 @echo ' or "cd tools; make help"' 1476 @echo '' 1477 @echo 'Kernel packaging:' 1478 @$(MAKE) $(build)=$(package-dir) help 1479 @echo '' 1480 @echo 'Documentation targets:' 1481 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1482 @echo '' 1483 @echo 'Architecture specific targets ($(SRCARCH)):' 1484 @$(if $(archhelp),$(archhelp),\ 1485 echo ' No architecture specific help defined for $(SRCARCH)') 1486 @echo '' 1487 @$(if $(boards), \ 1488 $(foreach b, $(boards), \ 1489 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1490 echo '') 1491 @$(if $(board-dirs), \ 1492 $(foreach b, $(board-dirs), \ 1493 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1494 printf " %-16s - Show all of the above\\n" help-boards; \ 1495 echo '') 1496 1497 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1498 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1499 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1500 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' 1501 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1502 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1503 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1504 @echo ' 1: warnings which may be relevant and do not occur too often' 1505 @echo ' 2: warnings which occur quite often but may still be relevant' 1506 @echo ' 3: more obscure warnings, can most likely be ignored' 1507 @echo ' Multiple levels can be combined with W=12 or W=123' 1508 @echo '' 1509 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1510 @echo 'For further info see the ./README file' 1511 1512 1513help-board-dirs := $(addprefix help-,$(board-dirs)) 1514 1515help-boards: $(help-board-dirs) 1516 1517boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1518 1519$(help-board-dirs): help-%: 1520 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1521 @$(if $(boards-per-dir), \ 1522 $(foreach b, $(boards-per-dir), \ 1523 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1524 echo '') 1525 1526 1527# Documentation targets 1528# --------------------------------------------------------------------------- 1529DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1530 linkcheckdocs dochelp refcheckdocs 1531PHONY += $(DOC_TARGETS) 1532$(DOC_TARGETS): scripts_basic FORCE 1533 $(Q)$(MAKE) $(build)=Documentation $@ 1534 1535else # KBUILD_EXTMOD 1536 1537### 1538# External module support. 1539# When building external modules the kernel used as basis is considered 1540# read-only, and no consistency checks are made and the make 1541# system is not used on the basis kernel. If updates are required 1542# in the basis kernel ordinary make commands (without M=...) must 1543# be used. 1544# 1545# The following are the only valid targets when building external 1546# modules. 1547# make M=dir clean Delete all automatically generated files 1548# make M=dir modules Make all modules in specified dir 1549# make M=dir Same as 'make M=dir modules' 1550# make M=dir modules_install 1551# Install the modules built in the module directory 1552# Assumes install directory is already created 1553 1554# We are always building modules 1555KBUILD_MODULES := 1 1556PHONY += crmodverdir 1557crmodverdir: 1558 $(cmd_crmodverdir) 1559 1560PHONY += $(objtree)/Module.symvers 1561$(objtree)/Module.symvers: 1562 @test -e $(objtree)/Module.symvers || ( \ 1563 echo; \ 1564 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1565 echo " is missing; modules will have no dependencies and modversions."; \ 1566 echo ) 1567 1568module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1569PHONY += $(module-dirs) modules 1570$(module-dirs): crmodverdir $(objtree)/Module.symvers 1571 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1572 1573modules: $(module-dirs) 1574 @$(kecho) ' Building modules, stage 2.'; 1575 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1576 1577PHONY += modules_install 1578modules_install: _emodinst_ _emodinst_post 1579 1580install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1581PHONY += _emodinst_ 1582_emodinst_: 1583 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1584 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1585 1586PHONY += _emodinst_post 1587_emodinst_post: _emodinst_ 1588 $(call cmd,depmod) 1589 1590clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1591 1592PHONY += $(clean-dirs) clean 1593$(clean-dirs): 1594 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1595 1596clean: rm-dirs := $(MODVERDIR) 1597clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1598 1599PHONY += help 1600help: 1601 @echo ' Building external modules.' 1602 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1603 @echo '' 1604 @echo ' modules - default target, build the module(s)' 1605 @echo ' modules_install - install the module' 1606 @echo ' clean - remove generated files in module directory only' 1607 @echo '' 1608 1609# Dummies... 1610PHONY += prepare scripts 1611prepare: ; 1612scripts: ; 1613endif # KBUILD_EXTMOD 1614 1615clean: $(clean-dirs) 1616 $(call cmd,rmdirs) 1617 $(call cmd,rmfiles) 1618 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1619 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1620 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \ 1621 -o -name '*.dwo' -o -name '*.lst' \ 1622 -o -name '*.su' \ 1623 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1624 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1625 -o -name '*.asn1.[ch]' \ 1626 -o -name '*.symtypes' -o -name 'modules.order' \ 1627 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1628 -o -name .cache.mk \ 1629 -o -name '*.c.[012]*.*' \ 1630 -o -name '*.ll' \ 1631 -o -name '*.gcno' \) -type f -print | xargs rm -f 1632 1633# Generate tags for editors 1634# --------------------------------------------------------------------------- 1635quiet_cmd_tags = GEN $@ 1636 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1637 1638tags TAGS cscope gtags: FORCE 1639 $(call cmd,tags) 1640 1641# Scripts to check various things for consistency 1642# --------------------------------------------------------------------------- 1643 1644PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1645 1646includecheck: 1647 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1648 -name '*.[hcS]' -type f -print | sort \ 1649 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1650 1651versioncheck: 1652 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1653 -name '*.[hcS]' -type f -print | sort \ 1654 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1655 1656coccicheck: 1657 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1658 1659namespacecheck: 1660 $(PERL) $(srctree)/scripts/namespace.pl 1661 1662export_report: 1663 $(PERL) $(srctree)/scripts/export_report.pl 1664 1665endif #ifeq ($(config-targets),1) 1666endif #ifeq ($(mixed-targets),1) 1667 1668PHONY += checkstack kernelrelease kernelversion image_name 1669 1670# UML needs a little special treatment here. It wants to use the host 1671# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1672# else wants $(ARCH), including people doing cross-builds, which means 1673# that $(SUBARCH) doesn't work here. 1674ifeq ($(ARCH), um) 1675CHECKSTACK_ARCH := $(SUBARCH) 1676else 1677CHECKSTACK_ARCH := $(ARCH) 1678endif 1679checkstack: 1680 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1681 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1682 1683kernelrelease: 1684 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1685 1686kernelversion: 1687 @echo $(KERNELVERSION) 1688 1689image_name: 1690 @echo $(KBUILD_IMAGE) 1691 1692# Clear a bunch of variables before executing the submake 1693tools/: FORCE 1694 $(Q)mkdir -p $(objtree)/tools 1695 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ 1696 1697tools/%: FORCE 1698 $(Q)mkdir -p $(objtree)/tools 1699 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $* 1700 1701# Single targets 1702# --------------------------------------------------------------------------- 1703# Single targets are compatible with: 1704# - build with mixed source and output 1705# - build with separate output dir 'make O=...' 1706# - external modules 1707# 1708# target-dir => where to store outputfile 1709# build-dir => directory in kernel source tree to use 1710 1711ifeq ($(KBUILD_EXTMOD),) 1712 build-dir = $(patsubst %/,%,$(dir $@)) 1713 target-dir = $(dir $@) 1714else 1715 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1716 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1717 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1718endif 1719 1720%.s: %.c prepare scripts FORCE 1721 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1722%.i: %.c prepare scripts FORCE 1723 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1724%.o: %.c prepare scripts FORCE 1725 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1726%.lst: %.c prepare scripts FORCE 1727 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1728%.s: %.S prepare scripts FORCE 1729 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1730%.o: %.S prepare scripts FORCE 1731 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1732%.symtypes: %.c prepare scripts FORCE 1733 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1734%.ll: %.c prepare scripts FORCE 1735 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1736 1737# Modules 1738/: prepare scripts FORCE 1739 $(cmd_crmodverdir) 1740 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1741 $(build)=$(build-dir) 1742# Make sure the latest headers are built for Documentation 1743Documentation/ samples/: headers_install 1744%/: prepare scripts FORCE 1745 $(cmd_crmodverdir) 1746 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1747 $(build)=$(build-dir) 1748%.ko: prepare scripts FORCE 1749 $(cmd_crmodverdir) 1750 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1751 $(build)=$(build-dir) $(@:.ko=.o) 1752 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1753 1754# FIXME Should go into a make.lib or something 1755# =========================================================================== 1756 1757quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1758 cmd_rmdirs = rm -rf $(rm-dirs) 1759 1760quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1761 cmd_rmfiles = rm -f $(rm-files) 1762 1763# Run depmod only if we have System.map and depmod is executable 1764quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1765 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1766 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))" 1767 1768# Create temporary dir for module support files 1769# clean it up only when building all modules 1770cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1771 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1772 1773# read all saved command lines 1774 1775cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd)) 1776 1777ifneq ($(cmd_files),) 1778 $(cmd_files): ; # Do not try to update included dependency files 1779 include $(cmd_files) 1780endif 1781 1782endif # skip-makefile 1783 1784PHONY += FORCE 1785FORCE: 1786 1787# Declare the contents of the .PHONY variable as phony. We keep that 1788# information in a variable so we can use it in if_changed and friends. 1789.PHONY: $(PHONY) 1790