1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 1 4SUBLEVEL = 0 5EXTRAVERSION = -rc3 6NAME = Shy Crocodile 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# We are using a recursive build, so we need to do a little thinking 19# to get the ordering right. 20# 21# Most importantly: sub-Makefiles should only ever modify files in 22# their own directory. If in some directory we have a dependency on 23# a file in another dir (which doesn't happen often, but it's often 24# unavoidable when linking the built-in.a targets which finally 25# turn into vmlinux), we will call a sub make in that other dir, and 26# after that we are sure that everything which is in that other dir 27# is now up to date. 28# 29# The only cases where we need to modify files which have global 30# effects are thus separated out and done before the recursive 31# descending is started. They are now explicitly listed as the 32# prepare rule. 33 34ifneq ($(sub_make_done),1) 35 36# Do not use make's built-in rules and variables 37# (this increases performance and avoids hard-to-debug behaviour) 38MAKEFLAGS += -rR 39 40# Avoid funny character set dependencies 41unexport LC_ALL 42LC_COLLATE=C 43LC_NUMERIC=C 44export LC_COLLATE LC_NUMERIC 45 46# Avoid interference with shell env settings 47unexport GREP_OPTIONS 48 49# Beautify output 50# --------------------------------------------------------------------------- 51# 52# Normally, we echo the whole command before executing it. By making 53# that echo $($(quiet)$(cmd)), we now have the possibility to set 54# $(quiet) to choose other forms of output instead, e.g. 55# 56# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 57# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 58# 59# If $(quiet) is empty, the whole command will be printed. 60# If it is set to "quiet_", only the short version will be printed. 61# If it is set to "silent_", nothing will be printed at all, since 62# the variable $(silent_cmd_cc_o_c) doesn't exist. 63# 64# A simple variant is to prefix commands with $(Q) - that's useful 65# for commands that shall be hidden in non-verbose mode. 66# 67# $(Q)ln $@ :< 68# 69# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 70# If KBUILD_VERBOSE equals 1 then the above command is displayed. 71# 72# To put more focus on warnings, be less verbose as default 73# Use 'make V=1' to see the full commands 74 75ifeq ("$(origin V)", "command line") 76 KBUILD_VERBOSE = $(V) 77endif 78ifndef KBUILD_VERBOSE 79 KBUILD_VERBOSE = 0 80endif 81 82ifeq ($(KBUILD_VERBOSE),1) 83 quiet = 84 Q = 85else 86 quiet=quiet_ 87 Q = @ 88endif 89 90# If the user is running make -s (silent mode), suppress echoing of 91# commands 92 93ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 94 quiet=silent_ 95endif 96 97export quiet Q KBUILD_VERBOSE 98 99# kbuild supports saving output files in a separate directory. 100# To locate output files in a separate directory two syntaxes are supported. 101# In both cases the working directory must be the root of the kernel src. 102# 1) O= 103# Use "make O=dir/to/store/output/files/" 104# 105# 2) Set KBUILD_OUTPUT 106# Set the environment variable KBUILD_OUTPUT to point to the directory 107# where the output files shall be placed. 108# export KBUILD_OUTPUT=dir/to/store/output/files/ 109# make 110# 111# The O= assignment takes precedence over the KBUILD_OUTPUT environment 112# variable. 113 114# KBUILD_SRC is not intended to be used by the regular user (for now), 115# it is set on invocation of make with KBUILD_OUTPUT or O= specified. 116 117# OK, Make called in directory where kernel src resides 118# Do we want to locate output files in a separate directory? 119ifeq ("$(origin O)", "command line") 120 KBUILD_OUTPUT := $(O) 121endif 122 123ifneq ($(words $(subst :, ,$(CURDIR))), 1) 124 $(error main directory cannot contain spaces nor colons) 125endif 126 127ifneq ($(KBUILD_OUTPUT),) 128# check that the output directory actually exists 129saved-output := $(KBUILD_OUTPUT) 130KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \ 131 && pwd) 132$(if $(KBUILD_OUTPUT),, \ 133 $(error failed to create output directory "$(saved-output)")) 134 135# Look for make include files relative to root of kernel src 136# 137# This does not become effective immediately because MAKEFLAGS is re-parsed 138# once after the Makefile is read. It is OK since we are going to invoke 139# 'sub-make' below. 140MAKEFLAGS += --include-dir=$(CURDIR) 141 142need-sub-make := 1 143else 144 145# Do not print "Entering directory ..." at all for in-tree build. 146MAKEFLAGS += --no-print-directory 147 148endif # ifneq ($(KBUILD_OUTPUT),) 149 150ifneq ($(filter 3.%,$(MAKE_VERSION)),) 151# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 152# We need to invoke sub-make to avoid implicit rules in the top Makefile. 153need-sub-make := 1 154# Cancel implicit rules for this Makefile. 155$(lastword $(MAKEFILE_LIST)): ; 156endif 157 158export sub_make_done := 1 159 160ifeq ($(need-sub-make),1) 161 162PHONY += $(MAKECMDGOALS) sub-make 163 164$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make 165 @: 166 167# Invoke a second make in the output directory, passing relevant variables 168sub-make: 169 $(Q)$(MAKE) \ 170 $(if $(KBUILD_OUTPUT),-C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR)) \ 171 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS)) 172 173endif # need-sub-make 174endif # sub_make_done 175 176# We process the rest of the Makefile if this is the final invocation of make 177ifeq ($(need-sub-make),) 178 179# Do not print "Entering directory ...", 180# but we want to display it when entering to the output directory 181# so that IDEs/editors are able to understand relative filenames. 182MAKEFLAGS += --no-print-directory 183 184# Call a source code checker (by default, "sparse") as part of the 185# C compilation. 186# 187# Use 'make C=1' to enable checking of only re-compiled files. 188# Use 'make C=2' to enable checking of *all* source files, regardless 189# of whether they are re-compiled or not. 190# 191# See the file "Documentation/dev-tools/sparse.rst" for more details, 192# including where to get the "sparse" utility. 193 194ifeq ("$(origin C)", "command line") 195 KBUILD_CHECKSRC = $(C) 196endif 197ifndef KBUILD_CHECKSRC 198 KBUILD_CHECKSRC = 0 199endif 200 201# Use make M=dir to specify directory of external module to build 202# Old syntax make ... SUBDIRS=$PWD is still supported 203# Setting the environment variable KBUILD_EXTMOD take precedence 204ifdef SUBDIRS 205 $(warning ================= WARNING ================) 206 $(warning 'SUBDIRS' will be removed after Linux 5.3) 207 $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead) 208 $(warning ==========================================) 209 KBUILD_EXTMOD ?= $(SUBDIRS) 210endif 211 212ifeq ("$(origin M)", "command line") 213 KBUILD_EXTMOD := $(M) 214endif 215 216ifeq ($(KBUILD_SRC),) 217 # building in the source tree 218 srctree := . 219else 220 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR))) 221 # building in a subdirectory of the source tree 222 srctree := .. 223 else 224 srctree := $(KBUILD_SRC) 225 endif 226endif 227 228export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC 229 230objtree := . 231src := $(srctree) 232obj := $(objtree) 233 234VPATH := $(srctree) 235 236export srctree objtree VPATH 237 238# To make sure we do not include .config for any of the *config targets 239# catch them early, and hand them over to scripts/kconfig/Makefile 240# It is allowed to specify more targets when calling make, including 241# mixing *config targets and build targets. 242# For example 'make oldconfig all'. 243# Detect when mixed targets is specified, and make a second invocation 244# of make so .config is not included in this case either (for *config). 245 246version_h := include/generated/uapi/linux/version.h 247old_version_h := include/linux/version.h 248 249clean-targets := %clean mrproper cleandocs 250no-dot-config-targets := $(clean-targets) \ 251 cscope gtags TAGS tags help% %docs check% coccicheck \ 252 $(version_h) headers_% archheaders archscripts \ 253 %asm-generic kernelversion %src-pkg 254no-sync-config-targets := $(no-dot-config-targets) install %install \ 255 kernelrelease 256 257config-targets := 0 258mixed-targets := 0 259dot-config := 1 260may-sync-config := 1 261 262ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 263 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 264 dot-config := 0 265 endif 266endif 267 268ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 269 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 270 may-sync-config := 0 271 endif 272endif 273 274ifneq ($(KBUILD_EXTMOD),) 275 may-sync-config := 0 276endif 277 278ifeq ($(KBUILD_EXTMOD),) 279 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 280 config-targets := 1 281 ifneq ($(words $(MAKECMDGOALS)),1) 282 mixed-targets := 1 283 endif 284 endif 285endif 286 287# For "make -j clean all", "make -j mrproper defconfig all", etc. 288ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 289 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 290 mixed-targets := 1 291 endif 292endif 293 294# install and modules_install need also be processed one by one 295ifneq ($(filter install,$(MAKECMDGOALS)),) 296 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 297 mixed-targets := 1 298 endif 299endif 300 301ifeq ($(mixed-targets),1) 302# =========================================================================== 303# We're called with mixed targets (*config and build targets). 304# Handle them one by one. 305 306PHONY += $(MAKECMDGOALS) __build_one_by_one 307 308$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 309 @: 310 311__build_one_by_one: 312 $(Q)set -e; \ 313 for i in $(MAKECMDGOALS); do \ 314 $(MAKE) -f $(srctree)/Makefile $$i; \ 315 done 316 317else 318 319include scripts/Kbuild.include 320 321# Read KERNELRELEASE from include/config/kernel.release (if it exists) 322KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 323KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 324export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 325 326include scripts/subarch.include 327 328# Cross compiling and selecting different set of gcc/bin-utils 329# --------------------------------------------------------------------------- 330# 331# When performing cross compilation for other architectures ARCH shall be set 332# to the target architecture. (See arch/* for the possibilities). 333# ARCH can be set during invocation of make: 334# make ARCH=ia64 335# Another way is to have ARCH set in the environment. 336# The default ARCH is the host where make is executed. 337 338# CROSS_COMPILE specify the prefix used for all executables used 339# during compilation. Only gcc and related bin-utils executables 340# are prefixed with $(CROSS_COMPILE). 341# CROSS_COMPILE can be set on the command line 342# make CROSS_COMPILE=ia64-linux- 343# Alternatively CROSS_COMPILE can be set in the environment. 344# Default value for CROSS_COMPILE is not to prefix executables 345# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 346ARCH ?= $(SUBARCH) 347 348# Architecture as present in compile.h 349UTS_MACHINE := $(ARCH) 350SRCARCH := $(ARCH) 351 352# Additional ARCH settings for x86 353ifeq ($(ARCH),i386) 354 SRCARCH := x86 355endif 356ifeq ($(ARCH),x86_64) 357 SRCARCH := x86 358endif 359 360# Additional ARCH settings for sparc 361ifeq ($(ARCH),sparc32) 362 SRCARCH := sparc 363endif 364ifeq ($(ARCH),sparc64) 365 SRCARCH := sparc 366endif 367 368# Additional ARCH settings for sh 369ifeq ($(ARCH),sh64) 370 SRCARCH := sh 371endif 372 373KCONFIG_CONFIG ?= .config 374export KCONFIG_CONFIG 375 376# SHELL used by kbuild 377CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 378 else if [ -x /bin/bash ]; then echo /bin/bash; \ 379 else echo sh; fi ; fi) 380 381HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 382HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 383HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 384 385HOSTCC = gcc 386HOSTCXX = g++ 387KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \ 388 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \ 389 $(HOSTCFLAGS) 390KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 391KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 392KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 393 394# Make variables (CC, etc...) 395AS = $(CROSS_COMPILE)as 396LD = $(CROSS_COMPILE)ld 397CC = $(CROSS_COMPILE)gcc 398CPP = $(CC) -E 399AR = $(CROSS_COMPILE)ar 400NM = $(CROSS_COMPILE)nm 401STRIP = $(CROSS_COMPILE)strip 402OBJCOPY = $(CROSS_COMPILE)objcopy 403OBJDUMP = $(CROSS_COMPILE)objdump 404LEX = flex 405YACC = bison 406AWK = awk 407INSTALLKERNEL := installkernel 408DEPMOD = /sbin/depmod 409PERL = perl 410PYTHON = python 411PYTHON2 = python2 412PYTHON3 = python3 413CHECK = sparse 414 415CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 416 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 417NOSTDINC_FLAGS := 418CFLAGS_MODULE = 419AFLAGS_MODULE = 420LDFLAGS_MODULE = 421CFLAGS_KERNEL = 422AFLAGS_KERNEL = 423LDFLAGS_vmlinux = 424 425# Use USERINCLUDE when you must reference the UAPI directories only. 426USERINCLUDE := \ 427 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 428 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 429 -I$(srctree)/include/uapi \ 430 -I$(objtree)/include/generated/uapi \ 431 -include $(srctree)/include/linux/kconfig.h 432 433# Use LINUXINCLUDE when you must reference the include/ directory. 434# Needed to be compatible with the O= option 435LINUXINCLUDE := \ 436 -I$(srctree)/arch/$(SRCARCH)/include \ 437 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 438 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 439 -I$(objtree)/include \ 440 $(USERINCLUDE) 441 442KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 443KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 444 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 445 -Werror=implicit-function-declaration -Werror=implicit-int \ 446 -Wno-format-security \ 447 -std=gnu89 448KBUILD_CPPFLAGS := -D__KERNEL__ 449KBUILD_AFLAGS_KERNEL := 450KBUILD_CFLAGS_KERNEL := 451KBUILD_AFLAGS_MODULE := -DMODULE 452KBUILD_CFLAGS_MODULE := -DMODULE 453KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 454KBUILD_LDFLAGS := 455GCC_PLUGINS_CFLAGS := 456 457export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC 458export CPP AR NM STRIP OBJCOPY OBJDUMP KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS 459export MAKE LEX YACC AWK INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE 460export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 461 462export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 463export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 464export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN 465export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 466export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 467export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 468export KBUILD_ARFLAGS 469 470# When compiling out-of-tree modules, put MODVERDIR in the module 471# tree rather than in the kernel tree. The kernel tree might 472# even be read-only. 473export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 474 475# Files to ignore in find ... statements 476 477export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 478 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 479 -prune -o 480export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 481 --exclude CVS --exclude .pc --exclude .hg --exclude .git 482 483# =========================================================================== 484# Rules shared between *config targets and build targets 485 486# Basic helpers built in scripts/basic/ 487PHONY += scripts_basic 488scripts_basic: 489 $(Q)$(MAKE) $(build)=scripts/basic 490 $(Q)rm -f .tmp_quiet_recordmcount 491 492PHONY += outputmakefile 493# outputmakefile generates a Makefile in the output directory, if using a 494# separate output directory. This allows convenient use of make in the 495# output directory. 496# At the same time when output Makefile generated, generate .gitignore to 497# ignore whole output directory 498outputmakefile: 499ifneq ($(KBUILD_SRC),) 500 $(Q)ln -fsn $(srctree) source 501 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 502 $(Q)test -e .gitignore || \ 503 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 504endif 505 506ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),) 507ifneq ($(CROSS_COMPILE),) 508CLANG_FLAGS := --target=$(notdir $(CROSS_COMPILE:%-=%)) 509GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 510CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR) 511GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) 512endif 513ifneq ($(GCC_TOOLCHAIN),) 514CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) 515endif 516CLANG_FLAGS += -no-integrated-as 517KBUILD_CFLAGS += $(CLANG_FLAGS) 518KBUILD_AFLAGS += $(CLANG_FLAGS) 519export CLANG_FLAGS 520endif 521 522RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 523RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 524RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 525RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 526RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 527RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 528export RETPOLINE_CFLAGS 529export RETPOLINE_VDSO_CFLAGS 530 531# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 532# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 533# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 534# and from include/config/auto.conf.cmd to detect the compiler upgrade. 535CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1) 536 537ifeq ($(config-targets),1) 538# =========================================================================== 539# *config targets only - make sure prerequisites are updated, and descend 540# in scripts/kconfig to make the *config target 541 542# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 543# KBUILD_DEFCONFIG may point out an alternative default configuration 544# used for 'make defconfig' 545include arch/$(SRCARCH)/Makefile 546export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 547 548config: scripts_basic outputmakefile FORCE 549 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 550 551%config: scripts_basic outputmakefile FORCE 552 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 553 554else 555# =========================================================================== 556# Build targets only - this includes vmlinux, arch specific targets, clean 557# targets and others. In general all targets except *config targets. 558 559# If building an external module we do not care about the all: rule 560# but instead _all depend on modules 561PHONY += all 562ifeq ($(KBUILD_EXTMOD),) 563_all: all 564else 565_all: modules 566endif 567 568# Decide whether to build built-in, modular, or both. 569# Normally, just do built-in. 570 571KBUILD_MODULES := 572KBUILD_BUILTIN := 1 573 574# If we have only "make modules", don't compile built-in objects. 575# When we're building modules with modversions, we need to consider 576# the built-in objects during the descend as well, in order to 577# make sure the checksums are up to date before we record them. 578 579ifeq ($(MAKECMDGOALS),modules) 580 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 581endif 582 583# If we have "make <whatever> modules", compile modules 584# in addition to whatever we do anyway. 585# Just "make" or "make all" shall build modules as well 586 587ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 588 KBUILD_MODULES := 1 589endif 590 591ifeq ($(MAKECMDGOALS),) 592 KBUILD_MODULES := 1 593endif 594 595export KBUILD_MODULES KBUILD_BUILTIN 596 597ifeq ($(KBUILD_EXTMOD),) 598# Objects we will link into vmlinux / subdirs we need to visit 599init-y := init/ 600drivers-y := drivers/ sound/ 601net-y := net/ 602libs-y := lib/ 603core-y := usr/ 604virt-y := virt/ 605endif # KBUILD_EXTMOD 606 607ifeq ($(dot-config),1) 608include include/config/auto.conf 609endif 610 611# The all: target is the default when no target is given on the 612# command line. 613# This allow a user to issue only 'make' to build a kernel including modules 614# Defaults to vmlinux, but the arch makefile usually adds further targets 615all: vmlinux 616 617CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 618 $(call cc-option,-fno-tree-loop-im) \ 619 $(call cc-disable-warning,maybe-uninitialized,) 620export CFLAGS_GCOV 621 622# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 623ifdef CONFIG_FUNCTION_TRACER 624 CC_FLAGS_FTRACE := -pg 625endif 626 627# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 628# values of the respective KBUILD_* variables 629ARCH_CPPFLAGS := 630ARCH_AFLAGS := 631ARCH_CFLAGS := 632include arch/$(SRCARCH)/Makefile 633 634ifeq ($(dot-config),1) 635ifeq ($(may-sync-config),1) 636# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 637# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 638# because some architectures define CROSS_COMPILE there. 639-include include/config/auto.conf.cmd 640 641$(KCONFIG_CONFIG): 642 @echo >&2 '***' 643 @echo >&2 '*** Configuration file "$@" not found!' 644 @echo >&2 '***' 645 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 646 @echo >&2 '*** "make menuconfig" or "make xconfig").' 647 @echo >&2 '***' 648 @/bin/false 649 650# The actual configuration files used during the build are stored in 651# include/generated/ and include/config/. Update them if .config is newer than 652# include/config/auto.conf (which mirrors .config). 653# 654# This exploits the 'multi-target pattern rule' trick. 655# The syncconfig should be executed only once to make all the targets. 656%/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG) 657 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 658else 659# External modules and some install targets need include/generated/autoconf.h 660# and include/config/auto.conf but do not care if they are up-to-date. 661# Use auto.conf to trigger the test 662PHONY += include/config/auto.conf 663 664include/config/auto.conf: 665 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 666 echo >&2; \ 667 echo >&2 " ERROR: Kernel configuration is invalid."; \ 668 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 669 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 670 echo >&2 ; \ 671 /bin/false) 672 673endif # may-sync-config 674endif # $(dot-config) 675 676KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 677KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 678KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 679KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 680KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context) 681 682ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 683KBUILD_CFLAGS += -Os 684else 685KBUILD_CFLAGS += -O2 686endif 687 688ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED 689KBUILD_CFLAGS += -Wno-maybe-uninitialized 690endif 691 692# Tell gcc to never replace conditional load with a non-conditional one 693KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 694 695include scripts/Makefile.kcov 696include scripts/Makefile.gcc-plugins 697 698ifdef CONFIG_READABLE_ASM 699# Disable optimizations that make assembler listings hard to read. 700# reorder blocks reorders the control in the function 701# ipa clone creates specialized cloned functions 702# partial inlining inlines only parts of functions 703KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 704 $(call cc-option,-fno-ipa-cp-clone,) \ 705 $(call cc-option,-fno-partial-inlining) 706endif 707 708ifneq ($(CONFIG_FRAME_WARN),0) 709KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 710endif 711 712stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector 713stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 714stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 715 716KBUILD_CFLAGS += $(stackp-flags-y) 717 718ifdef CONFIG_CC_IS_CLANG 719KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 720KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 721KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 722KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 723# Quiet clang warning: comparison of unsigned expression < 0 is always false 724KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 725# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 726# source of a reference will be _MergedGlobals and not on of the whitelisted names. 727# See modpost pattern 2 728KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 729KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 730else 731 732# These warnings generated too much noise in a regular build. 733# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 734KBUILD_CFLAGS += -Wno-unused-but-set-variable 735endif 736 737KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 738ifdef CONFIG_FRAME_POINTER 739KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 740else 741# Some targets (ARM with Thumb2, for example), can't be built with frame 742# pointers. For those, we don't have FUNCTION_TRACER automatically 743# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 744# incompatible with -fomit-frame-pointer with current GCC, so we don't use 745# -fomit-frame-pointer with FUNCTION_TRACER. 746ifndef CONFIG_FUNCTION_TRACER 747KBUILD_CFLAGS += -fomit-frame-pointer 748endif 749endif 750 751DEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments) 752 753ifdef CONFIG_DEBUG_INFO 754ifdef CONFIG_DEBUG_INFO_SPLIT 755DEBUG_CFLAGS += -gsplit-dwarf 756else 757DEBUG_CFLAGS += -g 758endif 759KBUILD_AFLAGS += -Wa,-gdwarf-2 760endif 761ifdef CONFIG_DEBUG_INFO_DWARF4 762DEBUG_CFLAGS += -gdwarf-4 763endif 764 765ifdef CONFIG_DEBUG_INFO_REDUCED 766DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 767 $(call cc-option,-fno-var-tracking) 768endif 769 770KBUILD_CFLAGS += $(DEBUG_CFLAGS) 771export DEBUG_CFLAGS 772 773ifdef CONFIG_FUNCTION_TRACER 774ifdef CONFIG_FTRACE_MCOUNT_RECORD 775 # gcc 5 supports generating the mcount tables directly 776 ifeq ($(call cc-option-yn,-mrecord-mcount),y) 777 CC_FLAGS_FTRACE += -mrecord-mcount 778 export CC_USING_RECORD_MCOUNT := 1 779 endif 780 ifdef CONFIG_HAVE_NOP_MCOUNT 781 ifeq ($(call cc-option-yn, -mnop-mcount),y) 782 CC_FLAGS_FTRACE += -mnop-mcount 783 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 784 endif 785 endif 786endif 787ifdef CONFIG_HAVE_FENTRY 788 ifeq ($(call cc-option-yn, -mfentry),y) 789 CC_FLAGS_FTRACE += -mfentry 790 CC_FLAGS_USING += -DCC_USING_FENTRY 791 endif 792endif 793export CC_FLAGS_FTRACE 794KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 795KBUILD_AFLAGS += $(CC_FLAGS_USING) 796ifdef CONFIG_DYNAMIC_FTRACE 797 ifdef CONFIG_HAVE_C_RECORDMCOUNT 798 BUILD_C_RECORDMCOUNT := y 799 export BUILD_C_RECORDMCOUNT 800 endif 801endif 802endif 803 804# We trigger additional mismatches with less inlining 805ifdef CONFIG_DEBUG_SECTION_MISMATCH 806KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 807endif 808 809ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 810KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 811LDFLAGS_vmlinux += --gc-sections 812endif 813 814# arch Makefile may override CC so keep this after arch Makefile is included 815NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 816 817# warn about C99 declaration after statement 818KBUILD_CFLAGS += -Wdeclaration-after-statement 819 820# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 821KBUILD_CFLAGS += $(call cc-option,-Wvla) 822 823# disable pointer signed / unsigned warnings in gcc 4.0 824KBUILD_CFLAGS += -Wno-pointer-sign 825 826# disable stringop warnings in gcc 8+ 827KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 828 829# disable invalid "can't wrap" optimizations for signed / pointers 830KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 831 832# clang sets -fmerge-all-constants by default as optimization, but this 833# is non-conforming behavior for C and in fact breaks the kernel, so we 834# need to disable it here generally. 835KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 836 837# for gcc -fno-merge-all-constants disables everything, but it is fine 838# to have actual conforming behavior enabled. 839KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 840 841# Make sure -fstack-check isn't enabled (like gentoo apparently did) 842KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 843 844# conserve stack if available 845KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 846 847# Prohibit date/time macros, which would make the build non-deterministic 848KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 849 850# enforce correct pointer usage 851KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 852 853# Require designated initializers for all marked structures 854KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 855 856# change __FILE__ to the relative path from the srctree 857KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 858 859# use the deterministic mode of AR if available 860KBUILD_ARFLAGS := $(call ar-option,D) 861 862include scripts/Makefile.kasan 863include scripts/Makefile.extrawarn 864include scripts/Makefile.ubsan 865 866# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 867# last assignments 868KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 869KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 870KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 871 872# Use --build-id when available. 873LDFLAGS_BUILD_ID := $(call ld-option, --build-id) 874KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 875LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 876 877ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 878LDFLAGS_vmlinux += $(call ld-option, -X,) 879endif 880 881# insure the checker run with the right endianness 882CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 883 884# the checker needs the correct machine size 885CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 886 887# Default kernel image to build when no specific target is given. 888# KBUILD_IMAGE may be overruled on the command line or 889# set in the environment 890# Also any assignments in arch/$(ARCH)/Makefile take precedence over 891# this default value 892export KBUILD_IMAGE ?= vmlinux 893 894# 895# INSTALL_PATH specifies where to place the updated kernel and system map 896# images. Default is /boot, but you can set it to other values 897export INSTALL_PATH ?= /boot 898 899# 900# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 901# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 902# an argument if needed. Otherwise it defaults to the kernel install path 903# 904export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 905 906# 907# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 908# relocations required by build roots. This is not defined in the 909# makefile but the argument can be passed to make if needed. 910# 911 912MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 913export MODLIB 914 915# 916# INSTALL_MOD_STRIP, if defined, will cause modules to be 917# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 918# the default option --strip-debug will be used. Otherwise, 919# INSTALL_MOD_STRIP value will be used as the options to the strip command. 920 921ifdef INSTALL_MOD_STRIP 922ifeq ($(INSTALL_MOD_STRIP),1) 923mod_strip_cmd = $(STRIP) --strip-debug 924else 925mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 926endif # INSTALL_MOD_STRIP=1 927else 928mod_strip_cmd = true 929endif # INSTALL_MOD_STRIP 930export mod_strip_cmd 931 932# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 933# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 934# or CONFIG_MODULE_COMPRESS_XZ. 935 936mod_compress_cmd = true 937ifdef CONFIG_MODULE_COMPRESS 938 ifdef CONFIG_MODULE_COMPRESS_GZIP 939 mod_compress_cmd = gzip -n -f 940 endif # CONFIG_MODULE_COMPRESS_GZIP 941 ifdef CONFIG_MODULE_COMPRESS_XZ 942 mod_compress_cmd = xz -f 943 endif # CONFIG_MODULE_COMPRESS_XZ 944endif # CONFIG_MODULE_COMPRESS 945export mod_compress_cmd 946 947ifdef CONFIG_MODULE_SIG_ALL 948$(eval $(call config_filename,MODULE_SIG_KEY)) 949 950mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 951else 952mod_sign_cmd = true 953endif 954export mod_sign_cmd 955 956HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 957 958ifdef CONFIG_STACK_VALIDATION 959 has_libelf := $(call try-run,\ 960 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 961 ifeq ($(has_libelf),1) 962 objtool_target := tools/objtool FORCE 963 else 964 SKIP_STACK_VALIDATION := 1 965 export SKIP_STACK_VALIDATION 966 endif 967endif 968 969PHONY += prepare0 970 971ifeq ($(KBUILD_EXTMOD),) 972core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 973 974vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 975 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 976 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 977 978vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 979 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-)))) 980 981init-y := $(patsubst %/, %/built-in.a, $(init-y)) 982core-y := $(patsubst %/, %/built-in.a, $(core-y)) 983drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y)) 984net-y := $(patsubst %/, %/built-in.a, $(net-y)) 985libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 986libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y))) 987virt-y := $(patsubst %/, %/built-in.a, $(virt-y)) 988 989# Externally visible symbols (used by link-vmlinux.sh) 990export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \ 991 $(drivers-y) $(net-y) $(virt-y) 992export KBUILD_VMLINUX_LIBS := $(libs-y1) 993export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 994export LDFLAGS_vmlinux 995# used by scripts/package/Makefile 996export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) 997 998vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 999 1000# Recurse until adjust_autoksyms.sh is satisfied 1001PHONY += autoksyms_recursive 1002autoksyms_recursive: $(vmlinux-deps) 1003ifdef CONFIG_TRIM_UNUSED_KSYMS 1004 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1005 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1006endif 1007 1008# For the kernel to actually contain only the needed exported symbols, 1009# we have to build modules as well to determine what those symbols are. 1010# (this can be evaluated only once include/config/auto.conf has been included) 1011ifdef CONFIG_TRIM_UNUSED_KSYMS 1012 KBUILD_MODULES := 1 1013endif 1014 1015autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1016 1017$(autoksyms_h): 1018 $(Q)mkdir -p $(dir $@) 1019 $(Q)touch $@ 1020 1021ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1022 1023# Final link of vmlinux with optional arch pass after final link 1024cmd_link-vmlinux = \ 1025 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1026 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1027 1028vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1029 +$(call if_changed,link-vmlinux) 1030 1031targets := vmlinux 1032 1033# Build samples along the rest of the kernel. This needs headers_install. 1034ifdef CONFIG_SAMPLES 1035vmlinux-dirs += samples 1036samples: headers_install 1037endif 1038 1039# The actual objects are generated when descending, 1040# make sure no implicit rule kicks in 1041$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 1042 1043# Handle descending into subdirectories listed in $(vmlinux-dirs) 1044# Preset locale variables to speed up the build process. Limit locale 1045# tweaks to this spot to avoid wrong language settings when running 1046# make menuconfig etc. 1047# Error messages still appears in the original language 1048 1049PHONY += $(vmlinux-dirs) 1050$(vmlinux-dirs): prepare 1051 $(Q)$(MAKE) $(build)=$@ need-builtin=1 1052 1053filechk_kernel.release = \ 1054 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1055 1056# Store (new) KERNELRELEASE string in include/config/kernel.release 1057include/config/kernel.release: $(srctree)/Makefile FORCE 1058 $(call filechk,kernel.release) 1059 1060# Additional helpers built in scripts/ 1061# Carefully list dependencies so we do not try to build scripts twice 1062# in parallel 1063PHONY += scripts 1064scripts: scripts_basic scripts_dtc 1065 $(Q)$(MAKE) $(build)=$(@) 1066 1067# Things we need to do before we recursively start building the kernel 1068# or the modules are listed in "prepare". 1069# A multi level approach is used. prepareN is processed before prepareN-1. 1070# archprepare is used in arch Makefiles and when processed asm symlink, 1071# version.h and scripts_basic is processed / created. 1072 1073PHONY += prepare archprepare prepare1 prepare3 1074 1075# prepare3 is used to check if we are building in a separate output directory, 1076# and if so do: 1077# 1) Check that make has not been executed in the kernel src $(srctree) 1078prepare3: include/config/kernel.release 1079ifneq ($(KBUILD_SRC),) 1080 @$(kecho) ' Using $(srctree) as source for kernel' 1081 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 1082 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 1083 echo >&2 " in the '$(srctree)' directory.";\ 1084 /bin/false; \ 1085 fi; 1086endif 1087 1088prepare1: prepare3 outputmakefile asm-generic $(version_h) $(autoksyms_h) \ 1089 include/generated/utsrelease.h 1090 $(cmd_crmodverdir) 1091 1092archprepare: archheaders archscripts prepare1 scripts 1093 1094prepare0: archprepare 1095 $(Q)$(MAKE) $(build)=scripts/mod 1096 $(Q)$(MAKE) $(build)=. 1097 1098# All the preparing.. 1099prepare: prepare0 prepare-objtool 1100 1101# Support for using generic headers in asm-generic 1102asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1103 1104PHONY += asm-generic uapi-asm-generic 1105asm-generic: uapi-asm-generic 1106 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1107 generic=include/asm-generic 1108uapi-asm-generic: 1109 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1110 generic=include/uapi/asm-generic 1111 1112PHONY += prepare-objtool 1113prepare-objtool: $(objtool_target) 1114ifeq ($(SKIP_STACK_VALIDATION),1) 1115ifdef CONFIG_UNWINDER_ORC 1116 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1117 @false 1118else 1119 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1120endif 1121endif 1122 1123# Generate some files 1124# --------------------------------------------------------------------------- 1125 1126# KERNELRELEASE can change from a few different places, meaning version.h 1127# needs to be updated, so this check is forced on all builds 1128 1129uts_len := 64 1130define filechk_utsrelease.h 1131 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1132 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1133 exit 1; \ 1134 fi; \ 1135 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1136endef 1137 1138define filechk_version.h 1139 echo \#define LINUX_VERSION_CODE $(shell \ 1140 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1141 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))' 1142endef 1143 1144$(version_h): FORCE 1145 $(call filechk,version.h) 1146 $(Q)rm -f $(old_version_h) 1147 1148include/generated/utsrelease.h: include/config/kernel.release FORCE 1149 $(call filechk,utsrelease.h) 1150 1151PHONY += headerdep 1152headerdep: 1153 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1154 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1155 1156# --------------------------------------------------------------------------- 1157# Kernel headers 1158 1159#Default location for installed headers 1160export INSTALL_HDR_PATH = $(objtree)/usr 1161 1162# If we do an all arch process set dst to include/arch-$(SRCARCH) 1163hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include) 1164 1165PHONY += archheaders archscripts 1166 1167PHONY += __headers 1168__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts 1169 $(Q)$(MAKE) $(build)=scripts build_unifdef 1170 1171PHONY += headers_install_all 1172headers_install_all: 1173 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1174 1175PHONY += headers_install 1176headers_install: __headers 1177 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1178 $(error Headers not exportable for the $(SRCARCH) architecture)) 1179 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include 1180 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) 1181 1182PHONY += headers_check_all 1183headers_check_all: headers_install_all 1184 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1185 1186PHONY += headers_check 1187headers_check: headers_install 1188 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1 1189 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1 1190 1191ifdef CONFIG_HEADERS_CHECK 1192all: headers_check 1193endif 1194 1195# --------------------------------------------------------------------------- 1196# Kernel selftest 1197 1198PHONY += kselftest 1199kselftest: 1200 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1201 1202PHONY += kselftest-clean 1203kselftest-clean: 1204 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean 1205 1206PHONY += kselftest-merge 1207kselftest-merge: 1208 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1209 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \ 1210 -m $(objtree)/.config \ 1211 $(srctree)/tools/testing/selftests/*/config 1212 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1213 1214# --------------------------------------------------------------------------- 1215# Devicetree files 1216 1217ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1218dtstree := arch/$(SRCARCH)/boot/dts 1219endif 1220 1221ifneq ($(dtstree),) 1222 1223%.dtb: prepare3 scripts_dtc 1224 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1225 1226PHONY += dtbs dtbs_install dt_binding_check 1227dtbs dtbs_check: prepare3 scripts_dtc 1228 $(Q)$(MAKE) $(build)=$(dtstree) 1229 1230dtbs_check: export CHECK_DTBS=1 1231dtbs_check: dt_binding_check 1232 1233dtbs_install: 1234 $(Q)$(MAKE) $(dtbinst)=$(dtstree) 1235 1236ifdef CONFIG_OF_EARLY_FLATTREE 1237all: dtbs 1238endif 1239 1240endif 1241 1242PHONY += scripts_dtc 1243scripts_dtc: scripts_basic 1244 $(Q)$(MAKE) $(build)=scripts/dtc 1245 1246dt_binding_check: scripts_dtc 1247 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1248 1249# --------------------------------------------------------------------------- 1250# Modules 1251 1252ifdef CONFIG_MODULES 1253 1254# By default, build modules as well 1255 1256all: modules 1257 1258# Build modules 1259# 1260# A module can be listed more than once in obj-m resulting in 1261# duplicate lines in modules.order files. Those are removed 1262# using awk while concatenating to the final file. 1263 1264PHONY += modules 1265modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1266 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1267 @$(kecho) ' Building modules, stage 2.'; 1268 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1269 1270modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1271 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1272 1273%/modules.builtin: include/config/auto.conf include/config/tristate.conf 1274 $(Q)$(MAKE) $(modbuiltin)=$* 1275 1276 1277# Target to prepare building external modules 1278PHONY += modules_prepare 1279modules_prepare: prepare 1280 1281# Target to install modules 1282PHONY += modules_install 1283modules_install: _modinst_ _modinst_post 1284 1285PHONY += _modinst_ 1286_modinst_: 1287 @rm -rf $(MODLIB)/kernel 1288 @rm -f $(MODLIB)/source 1289 @mkdir -p $(MODLIB)/kernel 1290 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1291 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1292 rm -f $(MODLIB)/build ; \ 1293 ln -s $(CURDIR) $(MODLIB)/build ; \ 1294 fi 1295 @cp -f $(objtree)/modules.order $(MODLIB)/ 1296 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1297 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1298 1299# This depmod is only for convenience to give the initial 1300# boot a modules.dep even before / is mounted read-write. However the 1301# boot script depmod is the master version. 1302PHONY += _modinst_post 1303_modinst_post: _modinst_ 1304 $(call cmd,depmod) 1305 1306ifeq ($(CONFIG_MODULE_SIG), y) 1307PHONY += modules_sign 1308modules_sign: 1309 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1310endif 1311 1312else # CONFIG_MODULES 1313 1314# Modules not configured 1315# --------------------------------------------------------------------------- 1316 1317PHONY += modules modules_install 1318modules modules_install: 1319 @echo >&2 1320 @echo >&2 "The present kernel configuration has modules disabled." 1321 @echo >&2 "Type 'make config' and enable loadable module support." 1322 @echo >&2 "Then build a kernel with module support enabled." 1323 @echo >&2 1324 @exit 1 1325 1326endif # CONFIG_MODULES 1327 1328### 1329# Cleaning is done on three levels. 1330# make clean Delete most generated files 1331# Leave enough to build external modules 1332# make mrproper Delete the current configuration, and all generated files 1333# make distclean Remove editor backup files, patch leftover files and the like 1334 1335# Directories & files removed with 'make clean' 1336CLEAN_DIRS += $(MODVERDIR) include/ksym 1337 1338# Directories & files removed with 'make mrproper' 1339MRPROPER_DIRS += include/config usr/include include/generated \ 1340 arch/*/include/generated .tmp_objdiff 1341MRPROPER_FILES += .config .config.old .version \ 1342 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1343 signing_key.pem signing_key.priv signing_key.x509 \ 1344 x509.genkey extra_certificates signing_key.x509.keyid \ 1345 signing_key.x509.signer vmlinux-gdb.py 1346 1347# clean - Delete most, but leave enough to build external modules 1348# 1349clean: rm-dirs := $(CLEAN_DIRS) 1350clean: rm-files := $(CLEAN_FILES) 1351clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1352 1353PHONY += $(clean-dirs) clean archclean vmlinuxclean 1354$(clean-dirs): 1355 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1356 1357vmlinuxclean: 1358 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1359 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1360 1361clean: archclean vmlinuxclean 1362 1363# mrproper - Delete all generated files, including .config 1364# 1365mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1366mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1367mrproper-dirs := $(addprefix _mrproper_,scripts) 1368 1369PHONY += $(mrproper-dirs) mrproper 1370$(mrproper-dirs): 1371 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1372 1373mrproper: clean $(mrproper-dirs) 1374 $(call cmd,rmdirs) 1375 $(call cmd,rmfiles) 1376 1377# distclean 1378# 1379PHONY += distclean 1380 1381distclean: mrproper 1382 @find $(srctree) $(RCS_FIND_IGNORE) \ 1383 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1384 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1385 -o -name 'core' \) \ 1386 -type f -print | xargs rm -f 1387 1388 1389# Packaging of the kernel to various formats 1390# --------------------------------------------------------------------------- 1391package-dir := scripts/package 1392 1393%src-pkg: FORCE 1394 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1395%pkg: include/config/kernel.release FORCE 1396 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1397 1398 1399# Brief documentation of the typical targets used 1400# --------------------------------------------------------------------------- 1401 1402boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1403boards := $(sort $(notdir $(boards))) 1404board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1405board-dirs := $(sort $(notdir $(board-dirs:/=))) 1406 1407PHONY += help 1408help: 1409 @echo 'Cleaning targets:' 1410 @echo ' clean - Remove most generated files but keep the config and' 1411 @echo ' enough build support to build external modules' 1412 @echo ' mrproper - Remove all generated files + config + various backup files' 1413 @echo ' distclean - mrproper + remove editor backup and patch files' 1414 @echo '' 1415 @echo 'Configuration targets:' 1416 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1417 @echo '' 1418 @echo 'Other generic targets:' 1419 @echo ' all - Build all targets marked with [*]' 1420 @echo '* vmlinux - Build the bare kernel' 1421 @echo '* modules - Build all modules' 1422 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1423 @echo ' dir/ - Build all files in dir and below' 1424 @echo ' dir/file.[ois] - Build specified target only' 1425 @echo ' dir/file.ll - Build the LLVM assembly file' 1426 @echo ' (requires compiler support for LLVM assembly generation)' 1427 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1428 @echo ' (requires a recent binutils and recent build (System.map))' 1429 @echo ' dir/file.ko - Build module including final link' 1430 @echo ' modules_prepare - Set up for building external modules' 1431 @echo ' tags/TAGS - Generate tags file for editors' 1432 @echo ' cscope - Generate cscope index' 1433 @echo ' gtags - Generate GNU GLOBAL index' 1434 @echo ' kernelrelease - Output the release version string (use with make -s)' 1435 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1436 @echo ' image_name - Output the image name (use with make -s)' 1437 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1438 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1439 echo '' 1440 @echo 'Static analysers:' 1441 @echo ' checkstack - Generate a list of stack hogs' 1442 @echo ' namespacecheck - Name space analysis on compiled kernel' 1443 @echo ' versioncheck - Sanity check on version.h usage' 1444 @echo ' includecheck - Check for duplicate included header files' 1445 @echo ' export_report - List the usages of all exported symbols' 1446 @echo ' headers_check - Sanity check on exported headers' 1447 @echo ' headerdep - Detect inclusion cycles in headers' 1448 @echo ' coccicheck - Check with Coccinelle' 1449 @echo '' 1450 @echo 'Kernel selftest:' 1451 @echo ' kselftest - Build and run kernel selftest (run as root)' 1452 @echo ' Build, install, and boot kernel before' 1453 @echo ' running kselftest on it' 1454 @echo ' kselftest-clean - Remove all generated kselftest files' 1455 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' 1456 @echo ' .config.' 1457 @echo '' 1458 @$(if $(dtstree), \ 1459 echo 'Devicetree:'; \ 1460 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1461 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1462 echo '') 1463 1464 @echo 'Userspace tools targets:' 1465 @echo ' use "make tools/help"' 1466 @echo ' or "cd tools; make help"' 1467 @echo '' 1468 @echo 'Kernel packaging:' 1469 @$(MAKE) $(build)=$(package-dir) help 1470 @echo '' 1471 @echo 'Documentation targets:' 1472 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1473 @echo '' 1474 @echo 'Architecture specific targets ($(SRCARCH)):' 1475 @$(if $(archhelp),$(archhelp),\ 1476 echo ' No architecture specific help defined for $(SRCARCH)') 1477 @echo '' 1478 @$(if $(boards), \ 1479 $(foreach b, $(boards), \ 1480 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1481 echo '') 1482 @$(if $(board-dirs), \ 1483 $(foreach b, $(board-dirs), \ 1484 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1485 printf " %-16s - Show all of the above\\n" help-boards; \ 1486 echo '') 1487 1488 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1489 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1490 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1491 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' 1492 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1493 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1494 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1495 @echo ' 1: warnings which may be relevant and do not occur too often' 1496 @echo ' 2: warnings which occur quite often but may still be relevant' 1497 @echo ' 3: more obscure warnings, can most likely be ignored' 1498 @echo ' Multiple levels can be combined with W=12 or W=123' 1499 @echo '' 1500 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1501 @echo 'For further info see the ./README file' 1502 1503 1504help-board-dirs := $(addprefix help-,$(board-dirs)) 1505 1506help-boards: $(help-board-dirs) 1507 1508boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1509 1510$(help-board-dirs): help-%: 1511 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1512 @$(if $(boards-per-dir), \ 1513 $(foreach b, $(boards-per-dir), \ 1514 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1515 echo '') 1516 1517 1518# Documentation targets 1519# --------------------------------------------------------------------------- 1520DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1521 linkcheckdocs dochelp refcheckdocs 1522PHONY += $(DOC_TARGETS) 1523$(DOC_TARGETS): scripts_basic FORCE 1524 $(Q)$(MAKE) $(build)=Documentation $@ 1525 1526# Misc 1527# --------------------------------------------------------------------------- 1528 1529PHONY += scripts_gdb 1530scripts_gdb: prepare 1531 $(Q)$(MAKE) $(build)=scripts/gdb 1532 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1533 1534ifdef CONFIG_GDB_SCRIPTS 1535all: scripts_gdb 1536endif 1537 1538else # KBUILD_EXTMOD 1539 1540### 1541# External module support. 1542# When building external modules the kernel used as basis is considered 1543# read-only, and no consistency checks are made and the make 1544# system is not used on the basis kernel. If updates are required 1545# in the basis kernel ordinary make commands (without M=...) must 1546# be used. 1547# 1548# The following are the only valid targets when building external 1549# modules. 1550# make M=dir clean Delete all automatically generated files 1551# make M=dir modules Make all modules in specified dir 1552# make M=dir Same as 'make M=dir modules' 1553# make M=dir modules_install 1554# Install the modules built in the module directory 1555# Assumes install directory is already created 1556 1557# We are always building modules 1558KBUILD_MODULES := 1 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): prepare $(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 1609PHONY += prepare 1610prepare: 1611 $(cmd_crmodverdir) 1612endif # KBUILD_EXTMOD 1613 1614clean: $(clean-dirs) 1615 $(call cmd,rmdirs) 1616 $(call cmd,rmfiles) 1617 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1618 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1619 -o -name '*.ko.*' \ 1620 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1621 -o -name '*.dwo' -o -name '*.lst' \ 1622 -o -name '*.su' \ 1623 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1624 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1625 -o -name '*.asn1.[ch]' \ 1626 -o -name '*.symtypes' -o -name 'modules.order' \ 1627 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1628 -o -name '*.c.[012]*.*' \ 1629 -o -name '*.ll' \ 1630 -o -name '*.gcno' \) -type f -print | xargs rm -f 1631 1632# Generate tags for editors 1633# --------------------------------------------------------------------------- 1634quiet_cmd_tags = GEN $@ 1635 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1636 1637tags TAGS cscope gtags: FORCE 1638 $(call cmd,tags) 1639 1640# Scripts to check various things for consistency 1641# --------------------------------------------------------------------------- 1642 1643PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1644 1645includecheck: 1646 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1647 -name '*.[hcS]' -type f -print | sort \ 1648 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1649 1650versioncheck: 1651 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1652 -name '*.[hcS]' -type f -print | sort \ 1653 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1654 1655coccicheck: 1656 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1657 1658namespacecheck: 1659 $(PERL) $(srctree)/scripts/namespace.pl 1660 1661export_report: 1662 $(PERL) $(srctree)/scripts/export_report.pl 1663 1664PHONY += checkstack kernelrelease kernelversion image_name 1665 1666# UML needs a little special treatment here. It wants to use the host 1667# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1668# else wants $(ARCH), including people doing cross-builds, which means 1669# that $(SUBARCH) doesn't work here. 1670ifeq ($(ARCH), um) 1671CHECKSTACK_ARCH := $(SUBARCH) 1672else 1673CHECKSTACK_ARCH := $(ARCH) 1674endif 1675checkstack: 1676 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1677 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1678 1679kernelrelease: 1680 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1681 1682kernelversion: 1683 @echo $(KERNELVERSION) 1684 1685image_name: 1686 @echo $(KBUILD_IMAGE) 1687 1688# Clear a bunch of variables before executing the submake 1689 1690ifeq ($(quiet),silent_) 1691tools_silent=s 1692endif 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 1698tools/%: FORCE 1699 $(Q)mkdir -p $(objtree)/tools 1700 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $* 1701 1702# Single targets 1703# --------------------------------------------------------------------------- 1704# Single targets are compatible with: 1705# - build with mixed source and output 1706# - build with separate output dir 'make O=...' 1707# - external modules 1708# 1709# target-dir => where to store outputfile 1710# build-dir => directory in kernel source tree to use 1711 1712build-target = $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD)/)$@ 1713build-dir = $(patsubst %/,%,$(dir $(build-target))) 1714 1715%.i: prepare FORCE 1716 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) 1717%.ll: prepare FORCE 1718 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) 1719%.lst: prepare FORCE 1720 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) 1721%.o: prepare FORCE 1722 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) 1723%.s: prepare FORCE 1724 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) 1725%.symtypes: prepare FORCE 1726 $(Q)$(MAKE) $(build)=$(build-dir) $(build-target) 1727%.ko: %.o 1728 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1729 1730# Modules 1731PHONY += / 1732/: ./ 1733 1734# Make sure the latest headers are built for Documentation 1735Documentation/ samples/: headers_install 1736%/: prepare FORCE 1737 $(Q)$(MAKE) KBUILD_MODULES=1 $(build)=$(build-dir) 1738 1739# FIXME Should go into a make.lib or something 1740# =========================================================================== 1741 1742quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1743 cmd_rmdirs = rm -rf $(rm-dirs) 1744 1745quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1746 cmd_rmfiles = rm -f $(rm-files) 1747 1748# Run depmod only if we have System.map and depmod is executable 1749quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1750 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1751 $(KERNELRELEASE) 1752 1753# Create temporary dir for module support files 1754# clean it up only when building all modules 1755cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1756 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1757 1758# read saved command lines for existing targets 1759existing-targets := $(wildcard $(sort $(targets))) 1760 1761-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1762 1763endif # ifeq ($(config-targets),1) 1764endif # ifeq ($(mixed-targets),1) 1765endif # need-sub-make 1766 1767PHONY += FORCE 1768FORCE: 1769 1770# Declare the contents of the PHONY variable as phony. We keep that 1771# information in a variable so we can use it in if_changed and friends. 1772.PHONY: $(PHONY) 1773