1# SPDX-License-Identifier: GPL-2.0 2VERSION = 4 3PATCHLEVEL = 17 4SUBLEVEL = 0 5EXTRAVERSION = -rc7 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) 287UNAME_RELEASE := $(shell uname --release) 288export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION UNAME_RELEASE 289 290# SUBARCH tells the usermode build what the underlying arch is. That is set 291# first, and if a usermode build is happening, the "ARCH=um" on the command 292# line overrides the setting of ARCH below. If a native build is happening, 293# then ARCH is assigned, getting whatever value it gets normally, and 294# SUBARCH is subsequently ignored. 295 296SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \ 297 -e s/sun4u/sparc64/ \ 298 -e s/arm.*/arm/ -e s/sa110/arm/ \ 299 -e s/s390x/s390/ -e s/parisc64/parisc/ \ 300 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \ 301 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \ 302 -e s/riscv.*/riscv/) 303 304# Cross compiling and selecting different set of gcc/bin-utils 305# --------------------------------------------------------------------------- 306# 307# When performing cross compilation for other architectures ARCH shall be set 308# to the target architecture. (See arch/* for the possibilities). 309# ARCH can be set during invocation of make: 310# make ARCH=ia64 311# Another way is to have ARCH set in the environment. 312# The default ARCH is the host where make is executed. 313 314# CROSS_COMPILE specify the prefix used for all executables used 315# during compilation. Only gcc and related bin-utils executables 316# are prefixed with $(CROSS_COMPILE). 317# CROSS_COMPILE can be set on the command line 318# make CROSS_COMPILE=ia64-linux- 319# Alternatively CROSS_COMPILE can be set in the environment. 320# Default value for CROSS_COMPILE is not to prefix executables 321# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 322ARCH ?= $(SUBARCH) 323 324# Architecture as present in compile.h 325UTS_MACHINE := $(ARCH) 326SRCARCH := $(ARCH) 327 328# Additional ARCH settings for x86 329ifeq ($(ARCH),i386) 330 SRCARCH := x86 331endif 332ifeq ($(ARCH),x86_64) 333 SRCARCH := x86 334endif 335 336# Additional ARCH settings for sparc 337ifeq ($(ARCH),sparc32) 338 SRCARCH := sparc 339endif 340ifeq ($(ARCH),sparc64) 341 SRCARCH := sparc 342endif 343 344# Additional ARCH settings for sh 345ifeq ($(ARCH),sh64) 346 SRCARCH := sh 347endif 348 349KCONFIG_CONFIG ?= .config 350export KCONFIG_CONFIG 351 352# SHELL used by kbuild 353CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 354 else if [ -x /bin/bash ]; then echo /bin/bash; \ 355 else echo sh; fi ; fi) 356 357HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS) 358HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS) 359HOST_LFS_LIBS := $(shell getconf LFS_LIBS) 360 361HOSTCC = gcc 362HOSTCXX = g++ 363HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \ 364 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) 365HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) 366HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) 367HOST_LOADLIBES := $(HOST_LFS_LIBS) 368 369# Make variables (CC, etc...) 370AS = $(CROSS_COMPILE)as 371LD = $(CROSS_COMPILE)ld 372CC = $(CROSS_COMPILE)gcc 373CPP = $(CC) -E 374AR = $(CROSS_COMPILE)ar 375NM = $(CROSS_COMPILE)nm 376STRIP = $(CROSS_COMPILE)strip 377OBJCOPY = $(CROSS_COMPILE)objcopy 378OBJDUMP = $(CROSS_COMPILE)objdump 379LEX = flex 380YACC = bison 381AWK = awk 382GENKSYMS = scripts/genksyms/genksyms 383INSTALLKERNEL := installkernel 384DEPMOD = /sbin/depmod 385PERL = perl 386PYTHON = python 387PYTHON2 = python2 388PYTHON3 = python3 389CHECK = sparse 390 391CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 392 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 393NOSTDINC_FLAGS = 394CFLAGS_MODULE = 395AFLAGS_MODULE = 396LDFLAGS_MODULE = 397CFLAGS_KERNEL = 398AFLAGS_KERNEL = 399LDFLAGS_vmlinux = 400 401# Use USERINCLUDE when you must reference the UAPI directories only. 402USERINCLUDE := \ 403 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 404 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 405 -I$(srctree)/include/uapi \ 406 -I$(objtree)/include/generated/uapi \ 407 -include $(srctree)/include/linux/kconfig.h 408 409# Use LINUXINCLUDE when you must reference the include/ directory. 410# Needed to be compatible with the O= option 411LINUXINCLUDE := \ 412 -I$(srctree)/arch/$(SRCARCH)/include \ 413 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 414 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 415 -I$(objtree)/include \ 416 $(USERINCLUDE) 417 418KBUILD_AFLAGS := -D__ASSEMBLY__ 419KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 420 -fno-strict-aliasing -fno-common -fshort-wchar \ 421 -Werror-implicit-function-declaration \ 422 -Wno-format-security \ 423 -std=gnu89 424KBUILD_CPPFLAGS := -D__KERNEL__ 425KBUILD_AFLAGS_KERNEL := 426KBUILD_CFLAGS_KERNEL := 427KBUILD_AFLAGS_MODULE := -DMODULE 428KBUILD_CFLAGS_MODULE := -DMODULE 429KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 430LDFLAGS := 431GCC_PLUGINS_CFLAGS := 432 433export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC 434export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES 435export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE 436export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 437 438export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 439export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 440export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN 441export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 442export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 443export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 444export KBUILD_ARFLAGS 445 446# When compiling out-of-tree modules, put MODVERDIR in the module 447# tree rather than in the kernel tree. The kernel tree might 448# even be read-only. 449export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 450 451# Files to ignore in find ... statements 452 453export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 454 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 455 -prune -o 456export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 457 --exclude CVS --exclude .pc --exclude .hg --exclude .git 458 459# =========================================================================== 460# Rules shared between *config targets and build targets 461 462# Basic helpers built in scripts/basic/ 463PHONY += scripts_basic 464scripts_basic: 465 $(Q)$(MAKE) $(build)=scripts/basic 466 $(Q)rm -f .tmp_quiet_recordmcount 467 468# To avoid any implicit rule to kick in, define an empty command. 469scripts/basic/%: scripts_basic ; 470 471PHONY += outputmakefile 472# outputmakefile generates a Makefile in the output directory, if using a 473# separate output directory. This allows convenient use of make in the 474# output directory. 475outputmakefile: 476ifneq ($(KBUILD_SRC),) 477 $(Q)ln -fsn $(srctree) source 478 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 479 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 480endif 481 482ifeq ($(cc-name),clang) 483ifneq ($(CROSS_COMPILE),) 484CLANG_TARGET := --target=$(notdir $(CROSS_COMPILE:%-=%)) 485GCC_TOOLCHAIN := $(realpath $(dir $(shell which $(LD)))/..) 486endif 487ifneq ($(GCC_TOOLCHAIN),) 488CLANG_GCC_TC := --gcc-toolchain=$(GCC_TOOLCHAIN) 489endif 490KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 491KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 492KBUILD_CFLAGS += $(call cc-option, -no-integrated-as) 493KBUILD_AFLAGS += $(call cc-option, -no-integrated-as) 494endif 495 496RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 497RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 498RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 499export RETPOLINE_CFLAGS 500 501KBUILD_CFLAGS += $(call cc-option,-fno-PIE) 502KBUILD_AFLAGS += $(call cc-option,-fno-PIE) 503 504# check for 'asm goto' 505ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y) 506 CC_HAVE_ASM_GOTO := 1 507 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 508 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO 509endif 510 511ifeq ($(config-targets),1) 512# =========================================================================== 513# *config targets only - make sure prerequisites are updated, and descend 514# in scripts/kconfig to make the *config target 515 516# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 517# KBUILD_DEFCONFIG may point out an alternative default configuration 518# used for 'make defconfig' 519include arch/$(SRCARCH)/Makefile 520export KBUILD_DEFCONFIG KBUILD_KCONFIG 521 522config: scripts_basic outputmakefile FORCE 523 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 524 525%config: scripts_basic outputmakefile FORCE 526 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 527 528else 529# =========================================================================== 530# Build targets only - this includes vmlinux, arch specific targets, clean 531# targets and others. In general all targets except *config targets. 532 533# If building an external module we do not care about the all: rule 534# but instead _all depend on modules 535PHONY += all 536ifeq ($(KBUILD_EXTMOD),) 537_all: all 538else 539_all: modules 540endif 541 542# Decide whether to build built-in, modular, or both. 543# Normally, just do built-in. 544 545KBUILD_MODULES := 546KBUILD_BUILTIN := 1 547 548# If we have only "make modules", don't compile built-in objects. 549# When we're building modules with modversions, we need to consider 550# the built-in objects during the descend as well, in order to 551# make sure the checksums are up to date before we record them. 552 553ifeq ($(MAKECMDGOALS),modules) 554 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 555endif 556 557# If we have "make <whatever> modules", compile modules 558# in addition to whatever we do anyway. 559# Just "make" or "make all" shall build modules as well 560 561ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 562 KBUILD_MODULES := 1 563endif 564 565ifeq ($(MAKECMDGOALS),) 566 KBUILD_MODULES := 1 567endif 568 569export KBUILD_MODULES KBUILD_BUILTIN 570 571ifeq ($(KBUILD_EXTMOD),) 572# Objects we will link into vmlinux / subdirs we need to visit 573init-y := init/ 574drivers-y := drivers/ sound/ firmware/ 575net-y := net/ 576libs-y := lib/ 577core-y := usr/ 578virt-y := virt/ 579endif # KBUILD_EXTMOD 580 581ifeq ($(dot-config),1) 582# Read in config 583-include include/config/auto.conf 584 585ifeq ($(KBUILD_EXTMOD),) 586# Read in dependencies to all Kconfig* files, make sure to run 587# oldconfig if changes are detected. 588-include include/config/auto.conf.cmd 589 590# To avoid any implicit rule to kick in, define an empty command 591$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 592 593# The actual configuration files used during the build are stored in 594# include/generated/ and include/config/. Update them if .config is newer than 595# include/config/auto.conf (which mirrors .config). 596include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 597 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 598else 599# external modules needs include/generated/autoconf.h and include/config/auto.conf 600# but do not care if they are up-to-date. Use auto.conf to trigger the test 601PHONY += include/config/auto.conf 602 603include/config/auto.conf: 604 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 605 echo >&2; \ 606 echo >&2 " ERROR: Kernel configuration is invalid."; \ 607 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 608 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 609 echo >&2 ; \ 610 /bin/false) 611 612endif # KBUILD_EXTMOD 613 614else 615# Dummy target needed, because used as prerequisite 616include/config/auto.conf: ; 617endif # $(dot-config) 618 619# The all: target is the default when no target is given on the 620# command line. 621# This allow a user to issue only 'make' to build a kernel including modules 622# Defaults to vmlinux, but the arch makefile usually adds further targets 623all: vmlinux 624 625CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 626 $(call cc-option,-fno-tree-loop-im) \ 627 $(call cc-disable-warning,maybe-uninitialized,) 628export CFLAGS_GCOV CFLAGS_KCOV 629 630# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 631# values of the respective KBUILD_* variables 632ARCH_CPPFLAGS := 633ARCH_AFLAGS := 634ARCH_CFLAGS := 635include arch/$(SRCARCH)/Makefile 636 637KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 638KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 639KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 640KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 641KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context) 642 643ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 644KBUILD_CFLAGS += $(call cc-option,-Oz,-Os) 645KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,) 646else 647ifdef CONFIG_PROFILE_ALL_BRANCHES 648KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,) 649else 650KBUILD_CFLAGS += -O2 651endif 652endif 653 654KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \ 655 $(call cc-disable-warning,maybe-uninitialized,)) 656 657# Tell gcc to never replace conditional load with a non-conditional one 658KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 659 660include scripts/Makefile.kcov 661include scripts/Makefile.gcc-plugins 662 663ifdef CONFIG_READABLE_ASM 664# Disable optimizations that make assembler listings hard to read. 665# reorder blocks reorders the control in the function 666# ipa clone creates specialized cloned functions 667# partial inlining inlines only parts of functions 668KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 669 $(call cc-option,-fno-ipa-cp-clone,) \ 670 $(call cc-option,-fno-partial-inlining) 671endif 672 673ifneq ($(CONFIG_FRAME_WARN),0) 674KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 675endif 676 677# This selects the stack protector compiler flag. Testing it is delayed 678# until after .config has been reprocessed, in the prepare-compiler-check 679# target. 680ifdef CONFIG_CC_STACKPROTECTOR_AUTO 681 stackp-flag := $(call cc-option,-fstack-protector-strong,$(call cc-option,-fstack-protector)) 682 stackp-name := AUTO 683else 684ifdef CONFIG_CC_STACKPROTECTOR_REGULAR 685 stackp-flag := -fstack-protector 686 stackp-name := REGULAR 687else 688ifdef CONFIG_CC_STACKPROTECTOR_STRONG 689 stackp-flag := -fstack-protector-strong 690 stackp-name := STRONG 691else 692 # If either there is no stack protector for this architecture or 693 # CONFIG_CC_STACKPROTECTOR_NONE is selected, we're done, and $(stackp-name) 694 # is empty, skipping all remaining stack protector tests. 695 # 696 # Force off for distro compilers that enable stack protector by default. 697 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector) 698endif 699endif 700endif 701# Find arch-specific stack protector compiler sanity-checking script. 702ifdef stackp-name 703ifneq ($(stackp-flag),) 704 stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh 705 stackp-check := $(wildcard $(stackp-path)) 706 # If the wildcard test matches a test script, run it to check functionality. 707 ifdef stackp-check 708 ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y) 709 stackp-broken := y 710 endif 711 endif 712 ifndef stackp-broken 713 # If the stack protector is functional, enable code that depends on it. 714 KBUILD_CPPFLAGS += -DCONFIG_CC_STACKPROTECTOR 715 # Either we've already detected the flag (for AUTO) or we'll fail the 716 # build in the prepare-compiler-check rule (for specific flag). 717 KBUILD_CFLAGS += $(stackp-flag) 718 else 719 # We have to make sure stack protector is unconditionally disabled if 720 # the compiler is broken (in case we're going to continue the build in 721 # AUTO mode). 722 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector) 723 endif 724endif 725endif 726 727ifeq ($(cc-name),clang) 728KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 729KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 730KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 731KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 732# Quiet clang warning: comparison of unsigned expression < 0 is always false 733KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 734# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 735# source of a reference will be _MergedGlobals and not on of the whitelisted names. 736# See modpost pattern 2 737KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 738KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 739else 740 741# These warnings generated too much noise in a regular build. 742# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 743KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 744endif 745 746KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 747ifdef CONFIG_FRAME_POINTER 748KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 749else 750# Some targets (ARM with Thumb2, for example), can't be built with frame 751# pointers. For those, we don't have FUNCTION_TRACER automatically 752# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 753# incompatible with -fomit-frame-pointer with current GCC, so we don't use 754# -fomit-frame-pointer with FUNCTION_TRACER. 755ifndef CONFIG_FUNCTION_TRACER 756KBUILD_CFLAGS += -fomit-frame-pointer 757endif 758endif 759 760KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 761 762ifdef CONFIG_DEBUG_INFO 763ifdef CONFIG_DEBUG_INFO_SPLIT 764KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 765else 766KBUILD_CFLAGS += -g 767endif 768KBUILD_AFLAGS += -Wa,-gdwarf-2 769endif 770ifdef CONFIG_DEBUG_INFO_DWARF4 771KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 772endif 773 774ifdef CONFIG_DEBUG_INFO_REDUCED 775KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 776 $(call cc-option,-fno-var-tracking) 777endif 778 779ifdef CONFIG_FUNCTION_TRACER 780ifndef CC_FLAGS_FTRACE 781CC_FLAGS_FTRACE := -pg 782endif 783export CC_FLAGS_FTRACE 784ifdef CONFIG_HAVE_FENTRY 785CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 786endif 787KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY) 788KBUILD_AFLAGS += $(CC_USING_FENTRY) 789ifdef CONFIG_DYNAMIC_FTRACE 790 ifdef CONFIG_HAVE_C_RECORDMCOUNT 791 BUILD_C_RECORDMCOUNT := y 792 export BUILD_C_RECORDMCOUNT 793 endif 794endif 795endif 796 797# We trigger additional mismatches with less inlining 798ifdef CONFIG_DEBUG_SECTION_MISMATCH 799KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 800endif 801 802ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 803KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,) 804KBUILD_CFLAGS += $(call cc-option,-fdata-sections,) 805endif 806 807# arch Makefile may override CC so keep this after arch Makefile is included 808NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 809CHECKFLAGS += $(NOSTDINC_FLAGS) 810 811# warn about C99 declaration after statement 812KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 813 814# disable pointer signed / unsigned warnings in gcc 4.0 815KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 816 817# disable invalid "can't wrap" optimizations for signed / pointers 818KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 819 820# clang sets -fmerge-all-constants by default as optimization, but this 821# is non-conforming behavior for C and in fact breaks the kernel, so we 822# need to disable it here generally. 823KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 824 825# for gcc -fno-merge-all-constants disables everything, but it is fine 826# to have actual conforming behavior enabled. 827KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 828 829# Make sure -fstack-check isn't enabled (like gentoo apparently did) 830KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 831 832# conserve stack if available 833KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 834 835# disallow errors like 'EXPORT_GPL(foo);' with missing header 836KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 837 838# require functions to have arguments in prototypes, not empty 'int foo()' 839KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 840 841# Prohibit date/time macros, which would make the build non-deterministic 842KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 843 844# enforce correct pointer usage 845KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 846 847# Require designated initializers for all marked structures 848KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 849 850# change __FILE__ to the relative path from the srctree 851KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 852 853# use the deterministic mode of AR if available 854KBUILD_ARFLAGS := $(call ar-option,D) 855 856include scripts/Makefile.kasan 857include scripts/Makefile.extrawarn 858include scripts/Makefile.ubsan 859 860# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 861# last assignments 862KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 863KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 864KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 865 866# Use --build-id when available. 867LDFLAGS_BUILD_ID := $(call ld-option, --build-id) 868KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 869LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 870 871ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 872LDFLAGS_vmlinux += $(call ld-option, --gc-sections,) 873endif 874 875ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 876LDFLAGS_vmlinux += $(call ld-option, -X,) 877endif 878 879# Default kernel image to build when no specific target is given. 880# KBUILD_IMAGE may be overruled on the command line or 881# set in the environment 882# Also any assignments in arch/$(ARCH)/Makefile take precedence over 883# this default value 884export KBUILD_IMAGE ?= vmlinux 885 886# 887# INSTALL_PATH specifies where to place the updated kernel and system map 888# images. Default is /boot, but you can set it to other values 889export INSTALL_PATH ?= /boot 890 891# 892# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 893# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 894# an argument if needed. Otherwise it defaults to the kernel install path 895# 896export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 897 898# 899# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 900# relocations required by build roots. This is not defined in the 901# makefile but the argument can be passed to make if needed. 902# 903 904MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 905export MODLIB 906 907# 908# INSTALL_MOD_STRIP, if defined, will cause modules to be 909# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 910# the default option --strip-debug will be used. Otherwise, 911# INSTALL_MOD_STRIP value will be used as the options to the strip command. 912 913ifdef INSTALL_MOD_STRIP 914ifeq ($(INSTALL_MOD_STRIP),1) 915mod_strip_cmd = $(STRIP) --strip-debug 916else 917mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 918endif # INSTALL_MOD_STRIP=1 919else 920mod_strip_cmd = true 921endif # INSTALL_MOD_STRIP 922export mod_strip_cmd 923 924# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 925# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 926# or CONFIG_MODULE_COMPRESS_XZ. 927 928mod_compress_cmd = true 929ifdef CONFIG_MODULE_COMPRESS 930 ifdef CONFIG_MODULE_COMPRESS_GZIP 931 mod_compress_cmd = gzip -n -f 932 endif # CONFIG_MODULE_COMPRESS_GZIP 933 ifdef CONFIG_MODULE_COMPRESS_XZ 934 mod_compress_cmd = xz -f 935 endif # CONFIG_MODULE_COMPRESS_XZ 936endif # CONFIG_MODULE_COMPRESS 937export mod_compress_cmd 938 939# Select initial ramdisk compression format, default is gzip(1). 940# This shall be used by the dracut(8) tool while creating an initramfs image. 941# 942INITRD_COMPRESS-y := gzip 943INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 944INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 945INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 946INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 947INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 948# do not export INITRD_COMPRESS, since we didn't actually 949# choose a sane default compression above. 950# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 951 952ifdef CONFIG_MODULE_SIG_ALL 953$(eval $(call config_filename,MODULE_SIG_KEY)) 954 955mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 956else 957mod_sign_cmd = true 958endif 959export mod_sign_cmd 960 961ifdef CONFIG_STACK_VALIDATION 962 has_libelf := $(call try-run,\ 963 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0) 964 ifeq ($(has_libelf),1) 965 objtool_target := tools/objtool FORCE 966 else 967 ifdef CONFIG_UNWINDER_ORC 968 $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 969 else 970 $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 971 endif 972 SKIP_STACK_VALIDATION := 1 973 export SKIP_STACK_VALIDATION 974 endif 975endif 976 977 978ifeq ($(KBUILD_EXTMOD),) 979core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 980 981vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 982 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 983 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 984 985vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 986 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-)))) 987 988init-y := $(patsubst %/, %/built-in.a, $(init-y)) 989core-y := $(patsubst %/, %/built-in.a, $(core-y)) 990drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y)) 991net-y := $(patsubst %/, %/built-in.a, $(net-y)) 992libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 993libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y))) 994virt-y := $(patsubst %/, %/built-in.a, $(virt-y)) 995 996# Externally visible symbols (used by link-vmlinux.sh) 997export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 998export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y) 999export KBUILD_VMLINUX_LIBS := $(libs-y1) 1000export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1001export LDFLAGS_vmlinux 1002# used by scripts/package/Makefile 1003export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) 1004 1005vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS) 1006 1007# Recurse until adjust_autoksyms.sh is satisfied 1008PHONY += autoksyms_recursive 1009autoksyms_recursive: $(vmlinux-deps) 1010ifdef CONFIG_TRIM_UNUSED_KSYMS 1011 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1012 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1013endif 1014 1015# For the kernel to actually contain only the needed exported symbols, 1016# we have to build modules as well to determine what those symbols are. 1017# (this can be evaluated only once include/config/auto.conf has been included) 1018ifdef CONFIG_TRIM_UNUSED_KSYMS 1019 KBUILD_MODULES := 1 1020endif 1021 1022autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1023 1024$(autoksyms_h): 1025 $(Q)mkdir -p $(dir $@) 1026 $(Q)touch $@ 1027 1028ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1029 1030# Final link of vmlinux with optional arch pass after final link 1031cmd_link-vmlinux = \ 1032 $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1033 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1034 1035vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1036ifdef CONFIG_HEADERS_CHECK 1037 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 1038endif 1039ifdef CONFIG_GDB_SCRIPTS 1040 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1041endif 1042 +$(call if_changed,link-vmlinux) 1043 1044# Build samples along the rest of the kernel 1045ifdef CONFIG_SAMPLES 1046vmlinux-dirs += samples 1047endif 1048 1049# The actual objects are generated when descending, 1050# make sure no implicit rule kicks in 1051$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 1052 1053# Handle descending into subdirectories listed in $(vmlinux-dirs) 1054# Preset locale variables to speed up the build process. Limit locale 1055# tweaks to this spot to avoid wrong language settings when running 1056# make menuconfig etc. 1057# Error messages still appears in the original language 1058 1059PHONY += $(vmlinux-dirs) 1060$(vmlinux-dirs): prepare scripts 1061 $(Q)$(MAKE) $(build)=$@ need-builtin=1 1062 1063define filechk_kernel.release 1064 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1065endef 1066 1067# Store (new) KERNELRELEASE string in include/config/kernel.release 1068include/config/kernel.release: include/config/auto.conf FORCE 1069 $(call filechk,kernel.release) 1070 1071# Additional helpers built in scripts/ 1072# Carefully list dependencies so we do not try to build scripts twice 1073# in parallel 1074PHONY += scripts 1075scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \ 1076 asm-generic gcc-plugins $(autoksyms_h) 1077 $(Q)$(MAKE) $(build)=$(@) 1078 1079# Things we need to do before we recursively start building the kernel 1080# or the modules are listed in "prepare". 1081# A multi level approach is used. prepareN is processed before prepareN-1. 1082# archprepare is used in arch Makefiles and when processed asm symlink, 1083# version.h and scripts_basic is processed / created. 1084 1085# Listed in dependency order 1086PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 1087 1088# prepare3 is used to check if we are building in a separate output directory, 1089# and if so do: 1090# 1) Check that make has not been executed in the kernel src $(srctree) 1091prepare3: include/config/kernel.release 1092ifneq ($(KBUILD_SRC),) 1093 @$(kecho) ' Using $(srctree) as source for kernel' 1094 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 1095 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 1096 echo >&2 " in the '$(srctree)' directory.";\ 1097 /bin/false; \ 1098 fi; 1099endif 1100 1101# prepare2 creates a makefile if using a separate output directory. 1102# From this point forward, .config has been reprocessed, so any rules 1103# that need to depend on updated CONFIG_* values can be checked here. 1104prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic 1105 1106prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1107 include/config/auto.conf 1108 $(cmd_crmodverdir) 1109 1110archprepare: archheaders archscripts prepare1 scripts_basic 1111 1112prepare0: archprepare gcc-plugins 1113 $(Q)$(MAKE) $(build)=. 1114 1115# All the preparing.. 1116prepare: prepare0 prepare-objtool 1117 1118# Support for using generic headers in asm-generic 1119PHONY += asm-generic uapi-asm-generic 1120asm-generic: uapi-asm-generic 1121 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1122 src=asm obj=arch/$(SRCARCH)/include/generated/asm 1123uapi-asm-generic: 1124 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1125 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 1126 1127PHONY += prepare-objtool 1128prepare-objtool: $(objtool_target) 1129 1130# Check for CONFIG flags that require compiler support. Abort the build 1131# after .config has been processed, but before the kernel build starts. 1132# 1133# For security-sensitive CONFIG options, we don't want to fallback and/or 1134# silently change which compiler flags will be used, since that leads to 1135# producing kernels with different security feature characteristics 1136# depending on the compiler used. (For example, "But I selected 1137# CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!") 1138PHONY += prepare-compiler-check 1139prepare-compiler-check: FORCE 1140# Make sure compiler supports requested stack protector flag. 1141ifdef stackp-name 1142 # Warn about CONFIG_CC_STACKPROTECTOR_AUTO having found no option. 1143 ifeq ($(stackp-flag),) 1144 @echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1145 Compiler does not support any known stack-protector >&2 1146 else 1147 # Fail if specifically requested stack protector is missing. 1148 ifeq ($(call cc-option, $(stackp-flag)),) 1149 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1150 $(stackp-flag) not supported by compiler >&2 && exit 1 1151 endif 1152 endif 1153endif 1154# Make sure compiler does not have buggy stack-protector support. If a 1155# specific stack-protector was requested, fail the build, otherwise warn. 1156ifdef stackp-broken 1157 ifeq ($(stackp-name),AUTO) 1158 @echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1159 $(stackp-flag) available but compiler is broken: disabling >&2 1160 else 1161 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1162 $(stackp-flag) available but compiler is broken >&2 && exit 1 1163 endif 1164endif 1165 @: 1166 1167# Generate some files 1168# --------------------------------------------------------------------------- 1169 1170# KERNELRELEASE can change from a few different places, meaning version.h 1171# needs to be updated, so this check is forced on all builds 1172 1173uts_len := 64 1174define filechk_utsrelease.h 1175 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1176 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1177 exit 1; \ 1178 fi; \ 1179 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 1180endef 1181 1182define filechk_version.h 1183 (echo \#define LINUX_VERSION_CODE $(shell \ 1184 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1185 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1186endef 1187 1188$(version_h): $(srctree)/Makefile FORCE 1189 $(call filechk,version.h) 1190 $(Q)rm -f $(old_version_h) 1191 1192include/generated/utsrelease.h: include/config/kernel.release FORCE 1193 $(call filechk,utsrelease.h) 1194 1195PHONY += headerdep 1196headerdep: 1197 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1198 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1199 1200# --------------------------------------------------------------------------- 1201# Kernel headers 1202 1203#Default location for installed headers 1204export INSTALL_HDR_PATH = $(objtree)/usr 1205 1206# If we do an all arch process set dst to include/arch-$(SRCARCH) 1207hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include) 1208 1209PHONY += archheaders 1210archheaders: 1211 1212PHONY += archscripts 1213archscripts: 1214 1215PHONY += __headers 1216__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts 1217 $(Q)$(MAKE) $(build)=scripts build_unifdef 1218 1219PHONY += headers_install_all 1220headers_install_all: 1221 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1222 1223PHONY += headers_install 1224headers_install: __headers 1225 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1226 $(error Headers not exportable for the $(SRCARCH) architecture)) 1227 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include 1228 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) 1229 1230PHONY += headers_check_all 1231headers_check_all: headers_install_all 1232 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1233 1234PHONY += headers_check 1235headers_check: headers_install 1236 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1 1237 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1 1238 1239# --------------------------------------------------------------------------- 1240# Kernel selftest 1241 1242PHONY += kselftest 1243kselftest: 1244 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1245 1246PHONY += kselftest-clean 1247kselftest-clean: 1248 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean 1249 1250PHONY += kselftest-merge 1251kselftest-merge: 1252 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1253 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \ 1254 -m $(objtree)/.config \ 1255 $(srctree)/tools/testing/selftests/*/config 1256 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1257 1258# --------------------------------------------------------------------------- 1259# Modules 1260 1261ifdef CONFIG_MODULES 1262 1263# By default, build modules as well 1264 1265all: modules 1266 1267# Build modules 1268# 1269# A module can be listed more than once in obj-m resulting in 1270# duplicate lines in modules.order files. Those are removed 1271# using awk while concatenating to the final file. 1272 1273PHONY += modules 1274modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1275 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1276 @$(kecho) ' Building modules, stage 2.'; 1277 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1278 1279modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1280 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1281 1282%/modules.builtin: include/config/auto.conf 1283 $(Q)$(MAKE) $(modbuiltin)=$* 1284 1285 1286# Target to prepare building external modules 1287PHONY += modules_prepare 1288modules_prepare: prepare scripts 1289 1290# Target to install modules 1291PHONY += modules_install 1292modules_install: _modinst_ _modinst_post 1293 1294PHONY += _modinst_ 1295_modinst_: 1296 @rm -rf $(MODLIB)/kernel 1297 @rm -f $(MODLIB)/source 1298 @mkdir -p $(MODLIB)/kernel 1299 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1300 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1301 rm -f $(MODLIB)/build ; \ 1302 ln -s $(CURDIR) $(MODLIB)/build ; \ 1303 fi 1304 @cp -f $(objtree)/modules.order $(MODLIB)/ 1305 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1306 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1307 1308# This depmod is only for convenience to give the initial 1309# boot a modules.dep even before / is mounted read-write. However the 1310# boot script depmod is the master version. 1311PHONY += _modinst_post 1312_modinst_post: _modinst_ 1313 $(call cmd,depmod) 1314 1315ifeq ($(CONFIG_MODULE_SIG), y) 1316PHONY += modules_sign 1317modules_sign: 1318 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1319endif 1320 1321else # CONFIG_MODULES 1322 1323# Modules not configured 1324# --------------------------------------------------------------------------- 1325 1326PHONY += modules modules_install 1327modules modules_install: 1328 @echo >&2 1329 @echo >&2 "The present kernel configuration has modules disabled." 1330 @echo >&2 "Type 'make config' and enable loadable module support." 1331 @echo >&2 "Then build a kernel with module support enabled." 1332 @echo >&2 1333 @exit 1 1334 1335endif # CONFIG_MODULES 1336 1337### 1338# Cleaning is done on three levels. 1339# make clean Delete most generated files 1340# Leave enough to build external modules 1341# make mrproper Delete the current configuration, and all generated files 1342# make distclean Remove editor backup files, patch leftover files and the like 1343 1344# Directories & files removed with 'make clean' 1345CLEAN_DIRS += $(MODVERDIR) include/ksym 1346 1347# Directories & files removed with 'make mrproper' 1348MRPROPER_DIRS += include/config usr/include include/generated \ 1349 arch/*/include/generated .tmp_objdiff 1350MRPROPER_FILES += .config .config.old .version \ 1351 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1352 signing_key.pem signing_key.priv signing_key.x509 \ 1353 x509.genkey extra_certificates signing_key.x509.keyid \ 1354 signing_key.x509.signer vmlinux-gdb.py 1355 1356# clean - Delete most, but leave enough to build external modules 1357# 1358clean: rm-dirs := $(CLEAN_DIRS) 1359clean: rm-files := $(CLEAN_FILES) 1360clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1361 1362PHONY += $(clean-dirs) clean archclean vmlinuxclean 1363$(clean-dirs): 1364 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1365 1366vmlinuxclean: 1367 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1368 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1369 1370clean: archclean vmlinuxclean 1371 1372# mrproper - Delete all generated files, including .config 1373# 1374mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1375mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1376mrproper-dirs := $(addprefix _mrproper_,scripts) 1377 1378PHONY += $(mrproper-dirs) mrproper archmrproper 1379$(mrproper-dirs): 1380 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1381 1382mrproper: clean archmrproper $(mrproper-dirs) 1383 $(call cmd,rmdirs) 1384 $(call cmd,rmfiles) 1385 1386# distclean 1387# 1388PHONY += distclean 1389 1390distclean: mrproper 1391 @find $(srctree) $(RCS_FIND_IGNORE) \ 1392 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1393 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1394 -o -name 'core' \) \ 1395 -type f -print | xargs rm -f 1396 1397 1398# Packaging of the kernel to various formats 1399# --------------------------------------------------------------------------- 1400# rpm target kept for backward compatibility 1401package-dir := scripts/package 1402 1403%src-pkg: FORCE 1404 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1405%pkg: include/config/kernel.release FORCE 1406 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1407rpm: rpm-pkg 1408 @echo " WARNING: \"rpm\" target will be removed after Linux 4.18" 1409 @echo " Please use \"rpm-pkg\" instead." 1410 1411 1412# Brief documentation of the typical targets used 1413# --------------------------------------------------------------------------- 1414 1415boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1416boards := $(sort $(notdir $(boards))) 1417board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1418board-dirs := $(sort $(notdir $(board-dirs:/=))) 1419 1420PHONY += help 1421help: 1422 @echo 'Cleaning targets:' 1423 @echo ' clean - Remove most generated files but keep the config and' 1424 @echo ' enough build support to build external modules' 1425 @echo ' mrproper - Remove all generated files + config + various backup files' 1426 @echo ' distclean - mrproper + remove editor backup and patch files' 1427 @echo '' 1428 @echo 'Configuration targets:' 1429 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1430 @echo '' 1431 @echo 'Other generic targets:' 1432 @echo ' all - Build all targets marked with [*]' 1433 @echo '* vmlinux - Build the bare kernel' 1434 @echo '* modules - Build all modules' 1435 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1436 @echo ' dir/ - Build all files in dir and below' 1437 @echo ' dir/file.[ois] - Build specified target only' 1438 @echo ' dir/file.ll - Build the LLVM assembly file' 1439 @echo ' (requires compiler support for LLVM assembly generation)' 1440 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1441 @echo ' (requires a recent binutils and recent build (System.map))' 1442 @echo ' dir/file.ko - Build module including final link' 1443 @echo ' modules_prepare - Set up for building external modules' 1444 @echo ' tags/TAGS - Generate tags file for editors' 1445 @echo ' cscope - Generate cscope index' 1446 @echo ' gtags - Generate GNU GLOBAL index' 1447 @echo ' kernelrelease - Output the release version string (use with make -s)' 1448 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1449 @echo ' image_name - Output the image name (use with make -s)' 1450 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1451 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1452 echo '' 1453 @echo 'Static analysers:' 1454 @echo ' checkstack - Generate a list of stack hogs' 1455 @echo ' namespacecheck - Name space analysis on compiled kernel' 1456 @echo ' versioncheck - Sanity check on version.h usage' 1457 @echo ' includecheck - Check for duplicate included header files' 1458 @echo ' export_report - List the usages of all exported symbols' 1459 @echo ' headers_check - Sanity check on exported headers' 1460 @echo ' headerdep - Detect inclusion cycles in headers' 1461 @echo ' coccicheck - Check with Coccinelle' 1462 @echo '' 1463 @echo 'Kernel selftest:' 1464 @echo ' kselftest - Build and run kernel selftest (run as root)' 1465 @echo ' Build, install, and boot kernel before' 1466 @echo ' running kselftest on it' 1467 @echo ' kselftest-clean - Remove all generated kselftest files' 1468 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' 1469 @echo ' .config.' 1470 @echo '' 1471 @echo 'Userspace tools targets:' 1472 @echo ' use "make tools/help"' 1473 @echo ' or "cd tools; make help"' 1474 @echo '' 1475 @echo 'Kernel packaging:' 1476 @$(MAKE) $(build)=$(package-dir) help 1477 @echo '' 1478 @echo 'Documentation targets:' 1479 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1480 @echo '' 1481 @echo 'Architecture specific targets ($(SRCARCH)):' 1482 @$(if $(archhelp),$(archhelp),\ 1483 echo ' No architecture specific help defined for $(SRCARCH)') 1484 @echo '' 1485 @$(if $(boards), \ 1486 $(foreach b, $(boards), \ 1487 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1488 echo '') 1489 @$(if $(board-dirs), \ 1490 $(foreach b, $(board-dirs), \ 1491 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1492 printf " %-16s - Show all of the above\\n" help-boards; \ 1493 echo '') 1494 1495 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1496 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1497 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1498 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' 1499 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1500 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1501 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1502 @echo ' 1: warnings which may be relevant and do not occur too often' 1503 @echo ' 2: warnings which occur quite often but may still be relevant' 1504 @echo ' 3: more obscure warnings, can most likely be ignored' 1505 @echo ' Multiple levels can be combined with W=12 or W=123' 1506 @echo '' 1507 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1508 @echo 'For further info see the ./README file' 1509 1510 1511help-board-dirs := $(addprefix help-,$(board-dirs)) 1512 1513help-boards: $(help-board-dirs) 1514 1515boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1516 1517$(help-board-dirs): help-%: 1518 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1519 @$(if $(boards-per-dir), \ 1520 $(foreach b, $(boards-per-dir), \ 1521 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1522 echo '') 1523 1524 1525# Documentation targets 1526# --------------------------------------------------------------------------- 1527DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1528 linkcheckdocs dochelp refcheckdocs 1529PHONY += $(DOC_TARGETS) 1530$(DOC_TARGETS): scripts_basic FORCE 1531 $(Q)$(MAKE) $(build)=Documentation $@ 1532 1533else # KBUILD_EXTMOD 1534 1535### 1536# External module support. 1537# When building external modules the kernel used as basis is considered 1538# read-only, and no consistency checks are made and the make 1539# system is not used on the basis kernel. If updates are required 1540# in the basis kernel ordinary make commands (without M=...) must 1541# be used. 1542# 1543# The following are the only valid targets when building external 1544# modules. 1545# make M=dir clean Delete all automatically generated files 1546# make M=dir modules Make all modules in specified dir 1547# make M=dir Same as 'make M=dir modules' 1548# make M=dir modules_install 1549# Install the modules built in the module directory 1550# Assumes install directory is already created 1551 1552# We are always building modules 1553KBUILD_MODULES := 1 1554PHONY += crmodverdir 1555crmodverdir: 1556 $(cmd_crmodverdir) 1557 1558PHONY += $(objtree)/Module.symvers 1559$(objtree)/Module.symvers: 1560 @test -e $(objtree)/Module.symvers || ( \ 1561 echo; \ 1562 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1563 echo " is missing; modules will have no dependencies and modversions."; \ 1564 echo ) 1565 1566module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1567PHONY += $(module-dirs) modules 1568$(module-dirs): crmodverdir $(objtree)/Module.symvers 1569 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1570 1571modules: $(module-dirs) 1572 @$(kecho) ' Building modules, stage 2.'; 1573 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1574 1575PHONY += modules_install 1576modules_install: _emodinst_ _emodinst_post 1577 1578install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1579PHONY += _emodinst_ 1580_emodinst_: 1581 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1582 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1583 1584PHONY += _emodinst_post 1585_emodinst_post: _emodinst_ 1586 $(call cmd,depmod) 1587 1588clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1589 1590PHONY += $(clean-dirs) clean 1591$(clean-dirs): 1592 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1593 1594clean: rm-dirs := $(MODVERDIR) 1595clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1596 1597PHONY += help 1598help: 1599 @echo ' Building external modules.' 1600 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1601 @echo '' 1602 @echo ' modules - default target, build the module(s)' 1603 @echo ' modules_install - install the module' 1604 @echo ' clean - remove generated files in module directory only' 1605 @echo '' 1606 1607# Dummies... 1608PHONY += prepare scripts 1609prepare: ; 1610scripts: ; 1611endif # KBUILD_EXTMOD 1612 1613clean: $(clean-dirs) 1614 $(call cmd,rmdirs) 1615 $(call cmd,rmfiles) 1616 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1617 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1618 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \ 1619 -o -name '*.dwo' -o -name '*.lst' \ 1620 -o -name '*.su' \ 1621 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1622 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1623 -o -name '*.asn1.[ch]' \ 1624 -o -name '*.symtypes' -o -name 'modules.order' \ 1625 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1626 -o -name '*.c.[012]*.*' \ 1627 -o -name '*.ll' \ 1628 -o -name '*.gcno' \) -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