1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 10 4SUBLEVEL = 97 5EXTRAVERSION = 6NAME = Dare mighty things 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$(if $(filter __%, $(MAKECMDGOALS)), \ 15 $(error targets prefixed with '__' are only for internal use)) 16 17# That's our default target when none is given on the command line 18PHONY := __all 19__all: 20 21# We are using a recursive build, so we need to do a little thinking 22# to get the ordering right. 23# 24# Most importantly: sub-Makefiles should only ever modify files in 25# their own directory. If in some directory we have a dependency on 26# a file in another dir (which doesn't happen often, but it's often 27# unavoidable when linking the built-in.a targets which finally 28# turn into vmlinux), we will call a sub make in that other dir, and 29# after that we are sure that everything which is in that other dir 30# is now up to date. 31# 32# The only cases where we need to modify files which have global 33# effects are thus separated out and done before the recursive 34# descending is started. They are now explicitly listed as the 35# prepare rule. 36 37ifneq ($(sub_make_done),1) 38 39# Do not use make's built-in rules and variables 40# (this increases performance and avoids hard-to-debug behaviour) 41MAKEFLAGS += -rR 42 43# Avoid funny character set dependencies 44unexport LC_ALL 45LC_COLLATE=C 46LC_NUMERIC=C 47export LC_COLLATE LC_NUMERIC 48 49# Avoid interference with shell env settings 50unexport GREP_OPTIONS 51 52# Beautify output 53# --------------------------------------------------------------------------- 54# 55# Normally, we echo the whole command before executing it. By making 56# that echo $($(quiet)$(cmd)), we now have the possibility to set 57# $(quiet) to choose other forms of output instead, e.g. 58# 59# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 60# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 61# 62# If $(quiet) is empty, the whole command will be printed. 63# If it is set to "quiet_", only the short version will be printed. 64# If it is set to "silent_", nothing will be printed at all, since 65# the variable $(silent_cmd_cc_o_c) doesn't exist. 66# 67# A simple variant is to prefix commands with $(Q) - that's useful 68# for commands that shall be hidden in non-verbose mode. 69# 70# $(Q)ln $@ :< 71# 72# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 73# If KBUILD_VERBOSE equals 1 then the above command is displayed. 74# If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt. 75# 76# To put more focus on warnings, be less verbose as default 77# Use 'make V=1' to see the full commands 78 79ifeq ("$(origin V)", "command line") 80 KBUILD_VERBOSE = $(V) 81endif 82ifndef KBUILD_VERBOSE 83 KBUILD_VERBOSE = 0 84endif 85 86ifeq ($(KBUILD_VERBOSE),1) 87 quiet = 88 Q = 89else 90 quiet=quiet_ 91 Q = @ 92endif 93 94# If the user is running make -s (silent mode), suppress echoing of 95# commands 96 97ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 98 quiet=silent_ 99endif 100 101export quiet Q KBUILD_VERBOSE 102 103# Kbuild will save output files in the current working directory. 104# This does not need to match to the root of the kernel source tree. 105# 106# For example, you can do this: 107# 108# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 109# 110# If you want to save output files in a different location, there are 111# two syntaxes to specify it. 112# 113# 1) O= 114# Use "make O=dir/to/store/output/files/" 115# 116# 2) Set KBUILD_OUTPUT 117# Set the environment variable KBUILD_OUTPUT to point to the output directory. 118# export KBUILD_OUTPUT=dir/to/store/output/files/; make 119# 120# The O= assignment takes precedence over the KBUILD_OUTPUT environment 121# variable. 122 123# Do we want to change the working directory? 124ifeq ("$(origin O)", "command line") 125 KBUILD_OUTPUT := $(O) 126endif 127 128ifneq ($(KBUILD_OUTPUT),) 129# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 130# expand a shell special character '~'. We use a somewhat tedious way here. 131abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 132$(if $(abs_objtree),, \ 133 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 134 135# $(realpath ...) resolves symlinks 136abs_objtree := $(realpath $(abs_objtree)) 137else 138abs_objtree := $(CURDIR) 139endif # ifneq ($(KBUILD_OUTPUT),) 140 141ifeq ($(abs_objtree),$(CURDIR)) 142# Suppress "Entering directory ..." unless we are changing the work directory. 143MAKEFLAGS += --no-print-directory 144else 145need-sub-make := 1 146endif 147 148abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST)))) 149 150ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 151$(error source directory cannot contain spaces or colons) 152endif 153 154ifneq ($(abs_srctree),$(abs_objtree)) 155# Look for make include files relative to root of kernel src 156# 157# This does not become effective immediately because MAKEFLAGS is re-parsed 158# once after the Makefile is read. We need to invoke sub-make. 159MAKEFLAGS += --include-dir=$(abs_srctree) 160need-sub-make := 1 161endif 162 163this-makefile := $(lastword $(MAKEFILE_LIST)) 164 165ifneq ($(filter 3.%,$(MAKE_VERSION)),) 166# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 167# We need to invoke sub-make to avoid implicit rules in the top Makefile. 168need-sub-make := 1 169# Cancel implicit rules for this Makefile. 170$(this-makefile): ; 171endif 172 173export abs_srctree abs_objtree 174export sub_make_done := 1 175 176ifeq ($(need-sub-make),1) 177 178PHONY += $(MAKECMDGOALS) __sub-make 179 180$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 181 @: 182 183# Invoke a second make in the output directory, passing relevant variables 184__sub-make: 185 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 186 187endif # need-sub-make 188endif # sub_make_done 189 190# We process the rest of the Makefile if this is the final invocation of make 191ifeq ($(need-sub-make),) 192 193# Do not print "Entering directory ...", 194# but we want to display it when entering to the output directory 195# so that IDEs/editors are able to understand relative filenames. 196MAKEFLAGS += --no-print-directory 197 198# Call a source code checker (by default, "sparse") as part of the 199# C compilation. 200# 201# Use 'make C=1' to enable checking of only re-compiled files. 202# Use 'make C=2' to enable checking of *all* source files, regardless 203# of whether they are re-compiled or not. 204# 205# See the file "Documentation/dev-tools/sparse.rst" for more details, 206# including where to get the "sparse" utility. 207 208ifeq ("$(origin C)", "command line") 209 KBUILD_CHECKSRC = $(C) 210endif 211ifndef KBUILD_CHECKSRC 212 KBUILD_CHECKSRC = 0 213endif 214 215# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 216# directory of external module to build. Setting M= takes precedence. 217ifeq ("$(origin M)", "command line") 218 KBUILD_EXTMOD := $(M) 219endif 220 221$(if $(word 2, $(KBUILD_EXTMOD)), \ 222 $(error building multiple external modules is not supported)) 223 224export KBUILD_CHECKSRC KBUILD_EXTMOD 225 226extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 227 228ifeq ($(abs_srctree),$(abs_objtree)) 229 # building in the source tree 230 srctree := . 231 building_out_of_srctree := 232else 233 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 234 # building in a subdirectory of the source tree 235 srctree := .. 236 else 237 srctree := $(abs_srctree) 238 endif 239 building_out_of_srctree := 1 240endif 241 242ifneq ($(KBUILD_ABS_SRCTREE),) 243srctree := $(abs_srctree) 244endif 245 246objtree := . 247VPATH := $(srctree) 248 249export building_out_of_srctree srctree objtree VPATH 250 251# To make sure we do not include .config for any of the *config targets 252# catch them early, and hand them over to scripts/kconfig/Makefile 253# It is allowed to specify more targets when calling make, including 254# mixing *config targets and build targets. 255# For example 'make oldconfig all'. 256# Detect when mixed targets is specified, and make a second invocation 257# of make so .config is not included in this case either (for *config). 258 259version_h := include/generated/uapi/linux/version.h 260old_version_h := include/linux/version.h 261 262clean-targets := %clean mrproper cleandocs 263no-dot-config-targets := $(clean-targets) \ 264 cscope gtags TAGS tags help% %docs check% coccicheck \ 265 $(version_h) headers headers_% archheaders archscripts \ 266 %asm-generic kernelversion %src-pkg dt_binding_check \ 267 outputmakefile 268no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \ 269 image_name 270single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ 271 272config-build := 273mixed-build := 274need-config := 1 275may-sync-config := 1 276single-build := 277 278ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 279 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 280 need-config := 281 endif 282endif 283 284ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 285 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 286 may-sync-config := 287 endif 288endif 289 290ifneq ($(KBUILD_EXTMOD),) 291 may-sync-config := 292endif 293 294ifeq ($(KBUILD_EXTMOD),) 295 ifneq ($(filter %config,$(MAKECMDGOALS)),) 296 config-build := 1 297 ifneq ($(words $(MAKECMDGOALS)),1) 298 mixed-build := 1 299 endif 300 endif 301endif 302 303# We cannot build single targets and the others at the same time 304ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 305 single-build := 1 306 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 307 mixed-build := 1 308 endif 309endif 310 311# For "make -j clean all", "make -j mrproper defconfig all", etc. 312ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 313 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 314 mixed-build := 1 315 endif 316endif 317 318# install and modules_install need also be processed one by one 319ifneq ($(filter install,$(MAKECMDGOALS)),) 320 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 321 mixed-build := 1 322 endif 323endif 324 325ifdef mixed-build 326# =========================================================================== 327# We're called with mixed targets (*config and build targets). 328# Handle them one by one. 329 330PHONY += $(MAKECMDGOALS) __build_one_by_one 331 332$(MAKECMDGOALS): __build_one_by_one 333 @: 334 335__build_one_by_one: 336 $(Q)set -e; \ 337 for i in $(MAKECMDGOALS); do \ 338 $(MAKE) -f $(srctree)/Makefile $$i; \ 339 done 340 341else # !mixed-build 342 343include scripts/Kbuild.include 344 345# Read KERNELRELEASE from include/config/kernel.release (if it exists) 346KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 347KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 348export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 349 350include scripts/subarch.include 351 352# Cross compiling and selecting different set of gcc/bin-utils 353# --------------------------------------------------------------------------- 354# 355# When performing cross compilation for other architectures ARCH shall be set 356# to the target architecture. (See arch/* for the possibilities). 357# ARCH can be set during invocation of make: 358# make ARCH=ia64 359# Another way is to have ARCH set in the environment. 360# The default ARCH is the host where make is executed. 361 362# CROSS_COMPILE specify the prefix used for all executables used 363# during compilation. Only gcc and related bin-utils executables 364# are prefixed with $(CROSS_COMPILE). 365# CROSS_COMPILE can be set on the command line 366# make CROSS_COMPILE=ia64-linux- 367# Alternatively CROSS_COMPILE can be set in the environment. 368# Default value for CROSS_COMPILE is not to prefix executables 369# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 370ARCH ?= $(SUBARCH) 371 372# Architecture as present in compile.h 373UTS_MACHINE := $(ARCH) 374SRCARCH := $(ARCH) 375 376# Additional ARCH settings for x86 377ifeq ($(ARCH),i386) 378 SRCARCH := x86 379endif 380ifeq ($(ARCH),x86_64) 381 SRCARCH := x86 382endif 383 384# Additional ARCH settings for sparc 385ifeq ($(ARCH),sparc32) 386 SRCARCH := sparc 387endif 388ifeq ($(ARCH),sparc64) 389 SRCARCH := sparc 390endif 391 392# Additional ARCH settings for sh 393ifeq ($(ARCH),sh64) 394 SRCARCH := sh 395endif 396 397KCONFIG_CONFIG ?= .config 398export KCONFIG_CONFIG 399 400# Default file for 'make defconfig'. This may be overridden by arch-Makefile. 401export KBUILD_DEFCONFIG := defconfig 402 403# SHELL used by kbuild 404CONFIG_SHELL := sh 405 406HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 407HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 408HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 409 410ifneq ($(LLVM),) 411HOSTCC = clang 412HOSTCXX = clang++ 413else 414HOSTCC = gcc 415HOSTCXX = g++ 416endif 417 418export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 419 -O2 -fomit-frame-pointer -std=gnu89 420export KBUILD_USERLDFLAGS := 421 422KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 423KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 424KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 425KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 426 427# Make variables (CC, etc...) 428CPP = $(CC) -E 429CCACHE = ccache 430ifneq ($(LLVM),) 431CC = $(CCACHE) clang 432LD = ld.lld 433AR = llvm-ar 434NM = llvm-nm 435OBJCOPY = llvm-objcopy 436OBJDUMP = llvm-objdump 437READELF = llvm-readelf 438STRIP = llvm-strip 439else 440CC = $(CCACHE) $(CROSS_COMPILE)gcc 441LD = $(CROSS_COMPILE)ld 442AR = $(CROSS_COMPILE)ar 443NM = $(CROSS_COMPILE)nm 444OBJCOPY = $(CROSS_COMPILE)objcopy 445OBJDUMP = $(CROSS_COMPILE)objdump 446READELF = $(CROSS_COMPILE)readelf 447STRIP = $(CROSS_COMPILE)strip 448endif 449PAHOLE = pahole 450RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 451LEX = flex 452YACC = bison 453AWK = awk 454INSTALLKERNEL := installkernel 455DEPMOD = depmod 456PERL = perl 457PYTHON = python 458PYTHON3 = python3 459CHECK = sparse 460BASH = bash 461KGZIP = gzip 462KBZIP2 = bzip2 463KLZOP = lzop 464LZMA = lzma 465LZ4 = lz4c 466XZ = xz 467ZSTD = zstd 468 469CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 470 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 471NOSTDINC_FLAGS := 472CFLAGS_MODULE = 473AFLAGS_MODULE = 474LDFLAGS_MODULE = 475CFLAGS_KERNEL = 476AFLAGS_KERNEL = 477LDFLAGS_vmlinux = 478 479# Use USERINCLUDE when you must reference the UAPI directories only. 480USERINCLUDE := \ 481 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 482 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 483 -I$(srctree)/include/uapi \ 484 -I$(objtree)/include/generated/uapi \ 485 -include $(srctree)/include/linux/kconfig.h 486 487# Use LINUXINCLUDE when you must reference the include/ directory. 488# Needed to be compatible with the O= option 489LINUXINCLUDE := \ 490 -I$(srctree)/arch/$(SRCARCH)/include \ 491 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 492 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 493 -I$(objtree)/include \ 494 $(USERINCLUDE) 495 496KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 497KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 498 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 499 -Werror=implicit-function-declaration -Werror=implicit-int \ 500 -Werror=return-type -Wno-format-security \ 501 -std=gnu89 502KBUILD_CPPFLAGS := -D__KERNEL__ 503KBUILD_AFLAGS_KERNEL := 504KBUILD_CFLAGS_KERNEL := 505KBUILD_AFLAGS_MODULE := -DMODULE 506KBUILD_CFLAGS_MODULE := -DMODULE 507KBUILD_LDFLAGS_MODULE := 508KBUILD_LDFLAGS := 509CLANG_FLAGS := 510 511export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 512export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 513export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 514export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 515export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 516 517export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 518export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 519export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 520export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 521export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 522 523# Files to ignore in find ... statements 524 525export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 526 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 527 -prune -o 528export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 529 --exclude CVS --exclude .pc --exclude .hg --exclude .git 530 531# =========================================================================== 532# Rules shared between *config targets and build targets 533 534# Basic helpers built in scripts/basic/ 535PHONY += scripts_basic 536scripts_basic: 537 $(Q)$(MAKE) $(build)=scripts/basic 538 $(Q)rm -f .tmp_quiet_recordmcount 539 540PHONY += outputmakefile 541# Before starting out-of-tree build, make sure the source tree is clean. 542# outputmakefile generates a Makefile in the output directory, if using a 543# separate output directory. This allows convenient use of make in the 544# output directory. 545# At the same time when output Makefile generated, generate .gitignore to 546# ignore whole output directory 547outputmakefile: 548ifdef building_out_of_srctree 549 $(Q)if [ -f $(srctree)/.config -o \ 550 -d $(srctree)/include/config -o \ 551 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 552 echo >&2 "***"; \ 553 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 554 echo >&2 "*** in $(abs_srctree)";\ 555 echo >&2 "***"; \ 556 false; \ 557 fi 558 $(Q)ln -fsn $(srctree) source 559 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 560 $(Q)test -e .gitignore || \ 561 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 562endif 563 564ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),) 565ifneq ($(CROSS_COMPILE),) 566CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) 567GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 568CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE)) 569GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) 570endif 571ifneq ($(GCC_TOOLCHAIN),) 572CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) 573endif 574ifneq ($(LLVM_IAS),1) 575CLANG_FLAGS += -no-integrated-as 576endif 577CLANG_FLAGS += -Werror=unknown-warning-option 578KBUILD_CFLAGS += $(CLANG_FLAGS) 579KBUILD_AFLAGS += $(CLANG_FLAGS) 580export CLANG_FLAGS 581endif 582 583# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 584# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 585# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 586# and from include/config/auto.conf.cmd to detect the compiler upgrade. 587CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1) 588 589ifdef config-build 590# =========================================================================== 591# *config targets only - make sure prerequisites are updated, and descend 592# in scripts/kconfig to make the *config target 593 594# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 595# KBUILD_DEFCONFIG may point out an alternative default configuration 596# used for 'make defconfig' 597include arch/$(SRCARCH)/Makefile 598export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 599 600config: outputmakefile scripts_basic FORCE 601 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 602 603%config: outputmakefile scripts_basic FORCE 604 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 605 606else #!config-build 607# =========================================================================== 608# Build targets only - this includes vmlinux, arch specific targets, clean 609# targets and others. In general all targets except *config targets. 610 611# If building an external module we do not care about the all: rule 612# but instead __all depend on modules 613PHONY += all 614ifeq ($(KBUILD_EXTMOD),) 615__all: all 616else 617__all: modules 618endif 619 620# Decide whether to build built-in, modular, or both. 621# Normally, just do built-in. 622 623KBUILD_MODULES := 624KBUILD_BUILTIN := 1 625 626# If we have only "make modules", don't compile built-in objects. 627ifeq ($(MAKECMDGOALS),modules) 628 KBUILD_BUILTIN := 629endif 630 631# If we have "make <whatever> modules", compile modules 632# in addition to whatever we do anyway. 633# Just "make" or "make all" shall build modules as well 634 635ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 636 KBUILD_MODULES := 1 637endif 638 639ifeq ($(MAKECMDGOALS),) 640 KBUILD_MODULES := 1 641endif 642 643export KBUILD_MODULES KBUILD_BUILTIN 644 645ifdef need-config 646include include/config/auto.conf 647endif 648 649ifeq ($(KBUILD_EXTMOD),) 650# Objects we will link into vmlinux / subdirs we need to visit 651core-y := init/ usr/ 652drivers-y := drivers/ sound/ 653drivers-$(CONFIG_SAMPLES) += samples/ 654drivers-y += net/ virt/ 655libs-y := lib/ 656endif # KBUILD_EXTMOD 657 658# The all: target is the default when no target is given on the 659# command line. 660# This allow a user to issue only 'make' to build a kernel including modules 661# Defaults to vmlinux, but the arch makefile usually adds further targets 662all: vmlinux 663 664CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 665 $(call cc-option,-fno-tree-loop-im) \ 666 $(call cc-disable-warning,maybe-uninitialized,) 667export CFLAGS_GCOV 668 669# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 670ifdef CONFIG_FUNCTION_TRACER 671 CC_FLAGS_FTRACE := -pg 672endif 673 674ifdef CONFIG_CC_IS_GCC 675RETPOLINE_CFLAGS := $(call cc-option,-mindirect-branch=thunk-extern -mindirect-branch-register) 676RETPOLINE_VDSO_CFLAGS := $(call cc-option,-mindirect-branch=thunk-inline -mindirect-branch-register) 677endif 678ifdef CONFIG_CC_IS_CLANG 679RETPOLINE_CFLAGS := -mretpoline-external-thunk 680RETPOLINE_VDSO_CFLAGS := -mretpoline 681endif 682 683ifdef CONFIG_RETHUNK 684RETHUNK_CFLAGS := -mfunction-return=thunk-extern 685RETPOLINE_CFLAGS += $(RETHUNK_CFLAGS) 686endif 687 688export RETPOLINE_CFLAGS 689export RETPOLINE_VDSO_CFLAGS 690 691include arch/$(SRCARCH)/Makefile 692 693ifdef need-config 694ifdef may-sync-config 695# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 696# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 697# because some architectures define CROSS_COMPILE there. 698include include/config/auto.conf.cmd 699 700$(KCONFIG_CONFIG): 701 @echo >&2 '***' 702 @echo >&2 '*** Configuration file "$@" not found!' 703 @echo >&2 '***' 704 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 705 @echo >&2 '*** "make menuconfig" or "make xconfig").' 706 @echo >&2 '***' 707 @/bin/false 708 709# The actual configuration files used during the build are stored in 710# include/generated/ and include/config/. Update them if .config is newer than 711# include/config/auto.conf (which mirrors .config). 712# 713# This exploits the 'multi-target pattern rule' trick. 714# The syncconfig should be executed only once to make all the targets. 715# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 716# 717# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 718# so you cannot notice that Kconfig is waiting for the user input. 719%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 720 $(Q)$(kecho) " SYNC $@" 721 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 722else # !may-sync-config 723# External modules and some install targets need include/generated/autoconf.h 724# and include/config/auto.conf but do not care if they are up-to-date. 725# Use auto.conf to trigger the test 726PHONY += include/config/auto.conf 727 728include/config/auto.conf: 729 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 730 echo >&2; \ 731 echo >&2 " ERROR: Kernel configuration is invalid."; \ 732 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 733 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 734 echo >&2 ; \ 735 /bin/false) 736 737endif # may-sync-config 738endif # need-config 739 740KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 741KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 742KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 743KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 744KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 745 746ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 747KBUILD_CFLAGS += -O2 748else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 749KBUILD_CFLAGS += -O3 750else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 751KBUILD_CFLAGS += -Os 752endif 753 754# Tell gcc to never replace conditional load with a non-conditional one 755KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 756KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 757 758ifdef CONFIG_READABLE_ASM 759# Disable optimizations that make assembler listings hard to read. 760# reorder blocks reorders the control in the function 761# ipa clone creates specialized cloned functions 762# partial inlining inlines only parts of functions 763KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 764 $(call cc-option,-fno-ipa-cp-clone,) \ 765 $(call cc-option,-fno-partial-inlining) 766endif 767 768ifneq ($(CONFIG_FRAME_WARN),0) 769KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 770endif 771 772stackp-flags-y := -fno-stack-protector 773stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 774stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 775 776KBUILD_CFLAGS += $(stackp-flags-y) 777 778ifdef CONFIG_CC_IS_CLANG 779KBUILD_CPPFLAGS += -Qunused-arguments 780KBUILD_CFLAGS += -Wno-format-invalid-specifier 781KBUILD_CFLAGS += -Wno-gnu 782# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 783# source of a reference will be _MergedGlobals and not on of the whitelisted names. 784# See modpost pattern 2 785KBUILD_CFLAGS += -mno-global-merge 786else 787 788# Warn about unmarked fall-throughs in switch statement. 789# Disabled for clang while comment to attribute conversion happens and 790# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed. 791KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,) 792endif 793 794# These warnings generated too much noise in a regular build. 795# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 796KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 797 798KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 799ifdef CONFIG_FRAME_POINTER 800KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 801else 802# Some targets (ARM with Thumb2, for example), can't be built with frame 803# pointers. For those, we don't have FUNCTION_TRACER automatically 804# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 805# incompatible with -fomit-frame-pointer with current GCC, so we don't use 806# -fomit-frame-pointer with FUNCTION_TRACER. 807ifndef CONFIG_FUNCTION_TRACER 808KBUILD_CFLAGS += -fomit-frame-pointer 809endif 810endif 811 812# Initialize all stack variables with a 0xAA pattern. 813ifdef CONFIG_INIT_STACK_ALL_PATTERN 814KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 815endif 816 817# Initialize all stack variables with a zero value. 818ifdef CONFIG_INIT_STACK_ALL_ZERO 819# Future support for zero initialization is still being debated, see 820# https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being 821# renamed or dropped. 822KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 823KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 824endif 825 826DEBUG_CFLAGS := 827 828# Workaround for GCC versions < 5.0 829# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801 830ifdef CONFIG_CC_IS_GCC 831DEBUG_CFLAGS += $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments)) 832endif 833 834ifdef CONFIG_DEBUG_INFO 835 836ifdef CONFIG_DEBUG_INFO_SPLIT 837DEBUG_CFLAGS += -gsplit-dwarf 838else 839DEBUG_CFLAGS += -g 840endif 841 842ifneq ($(LLVM_IAS),1) 843KBUILD_AFLAGS += -Wa,-gdwarf-2 844endif 845 846ifdef CONFIG_DEBUG_INFO_DWARF4 847DEBUG_CFLAGS += -gdwarf-4 848endif 849 850ifdef CONFIG_DEBUG_INFO_REDUCED 851DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 852 $(call cc-option,-fno-var-tracking) 853endif 854 855ifdef CONFIG_DEBUG_INFO_COMPRESSED 856DEBUG_CFLAGS += -gz=zlib 857KBUILD_AFLAGS += -gz=zlib 858KBUILD_LDFLAGS += --compress-debug-sections=zlib 859endif 860 861endif # CONFIG_DEBUG_INFO 862 863KBUILD_CFLAGS += $(DEBUG_CFLAGS) 864export DEBUG_CFLAGS 865 866ifdef CONFIG_FUNCTION_TRACER 867ifdef CONFIG_FTRACE_MCOUNT_USE_CC 868 CC_FLAGS_FTRACE += -mrecord-mcount 869 ifdef CONFIG_HAVE_NOP_MCOUNT 870 ifeq ($(call cc-option-yn, -mnop-mcount),y) 871 CC_FLAGS_FTRACE += -mnop-mcount 872 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 873 endif 874 endif 875endif 876ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 877 ifdef CONFIG_HAVE_C_RECORDMCOUNT 878 BUILD_C_RECORDMCOUNT := y 879 export BUILD_C_RECORDMCOUNT 880 endif 881endif 882ifdef CONFIG_HAVE_FENTRY 883 ifeq ($(call cc-option-yn, -mfentry),y) 884 CC_FLAGS_FTRACE += -mfentry 885 CC_FLAGS_USING += -DCC_USING_FENTRY 886 endif 887endif 888export CC_FLAGS_FTRACE 889KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 890KBUILD_AFLAGS += $(CC_FLAGS_USING) 891endif 892 893# We trigger additional mismatches with less inlining 894ifdef CONFIG_DEBUG_SECTION_MISMATCH 895KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 896endif 897 898ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 899KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 900LDFLAGS_vmlinux += --gc-sections 901endif 902 903ifdef CONFIG_SHADOW_CALL_STACK 904CC_FLAGS_SCS := -fsanitize=shadow-call-stack 905KBUILD_CFLAGS += $(CC_FLAGS_SCS) 906export CC_FLAGS_SCS 907endif 908 909ifdef CONFIG_LTO_CLANG 910ifdef CONFIG_LTO_CLANG_THIN 911CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 912KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod-prefix).thinlto-cache 913else 914CC_FLAGS_LTO := -flto 915endif 916CC_FLAGS_LTO += -fvisibility=hidden 917 918# Limit inlining across translation units to reduce binary size 919KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 920endif 921 922ifdef CONFIG_LTO 923KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 924KBUILD_AFLAGS += -fno-lto 925export CC_FLAGS_LTO 926endif 927 928ifdef CONFIG_CFI_CLANG 929CC_FLAGS_CFI := -fsanitize=cfi \ 930 -fsanitize-cfi-cross-dso \ 931 -fno-sanitize-cfi-canonical-jump-tables \ 932 -fno-sanitize-trap=cfi \ 933 -fno-sanitize-blacklist 934 935ifdef CONFIG_CFI_PERMISSIVE 936CC_FLAGS_CFI += -fsanitize-recover=cfi 937endif 938 939# If LTO flags are filtered out, we must also filter out CFI. 940CC_FLAGS_LTO += $(CC_FLAGS_CFI) 941KBUILD_CFLAGS += $(CC_FLAGS_CFI) 942export CC_FLAGS_CFI 943endif 944 945ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B 946KBUILD_CFLAGS += -falign-functions=32 947endif 948 949# arch Makefile may override CC so keep this after arch Makefile is included 950NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 951 952# warn about C99 declaration after statement 953KBUILD_CFLAGS += -Wdeclaration-after-statement 954 955# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 956KBUILD_CFLAGS += -Wvla 957 958# disable pointer signed / unsigned warnings in gcc 4.0 959KBUILD_CFLAGS += -Wno-pointer-sign 960 961# disable stringop warnings in gcc 8+ 962KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 963 964# We'll want to enable this eventually, but it's not going away for 5.7 at least 965KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 966KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) 967KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 968 969# Another good warning that we'll want to enable eventually 970KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 971 972# Enabled with W=2, disabled by default as noisy 973KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized) 974 975# disable invalid "can't wrap" optimizations for signed / pointers 976KBUILD_CFLAGS += -fno-strict-overflow 977 978# Make sure -fstack-check isn't enabled (like gentoo apparently did) 979KBUILD_CFLAGS += -fno-stack-check 980 981# conserve stack if available 982KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 983 984# Prohibit date/time macros, which would make the build non-deterministic 985KBUILD_CFLAGS += -Werror=date-time 986 987# enforce correct pointer usage 988KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 989 990# Require designated initializers for all marked structures 991KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 992 993# change __FILE__ to the relative path from the srctree 994KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 995 996# include additional Makefiles when needed 997include-y := scripts/Makefile.extrawarn 998include-$(CONFIG_KASAN) += scripts/Makefile.kasan 999include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1000include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1001include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1002include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1003 1004include $(addprefix $(srctree)/, $(include-y)) 1005 1006# scripts/Makefile.gcc-plugins is intentionally included last. 1007# Do not add $(call cc-option,...) below this line. When you build the kernel 1008# from the clean source tree, the GCC plugins do not exist at this point. 1009 1010# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 1011KBUILD_CPPFLAGS += $(KCPPFLAGS) 1012KBUILD_AFLAGS += $(KAFLAGS) 1013KBUILD_CFLAGS += $(KCFLAGS) 1014 1015KBUILD_LDFLAGS_MODULE += --build-id=sha1 1016LDFLAGS_vmlinux += --build-id=sha1 1017 1018ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1019LDFLAGS_vmlinux += $(call ld-option, -X,) 1020endif 1021 1022ifeq ($(CONFIG_RELR),y) 1023LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags 1024endif 1025 1026# We never want expected sections to be placed heuristically by the 1027# linker. All sections should be explicitly named in the linker script. 1028ifdef CONFIG_LD_ORPHAN_WARN 1029LDFLAGS_vmlinux += --orphan-handling=warn 1030endif 1031 1032# Align the bit size of userspace programs with the kernel 1033KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1034KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1035 1036# make the checker run with the right architecture 1037CHECKFLAGS += --arch=$(ARCH) 1038 1039# insure the checker run with the right endianness 1040CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1041 1042# the checker needs the correct machine size 1043CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1044 1045# Default kernel image to build when no specific target is given. 1046# KBUILD_IMAGE may be overruled on the command line or 1047# set in the environment 1048# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1049# this default value 1050export KBUILD_IMAGE ?= vmlinux 1051 1052# 1053# INSTALL_PATH specifies where to place the updated kernel and system map 1054# images. Default is /boot, but you can set it to other values 1055export INSTALL_PATH ?= /boot 1056 1057# 1058# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1059# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1060# an argument if needed. Otherwise it defaults to the kernel install path 1061# 1062export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1063 1064# 1065# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1066# relocations required by build roots. This is not defined in the 1067# makefile but the argument can be passed to make if needed. 1068# 1069 1070MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1071export MODLIB 1072 1073# 1074# INSTALL_MOD_STRIP, if defined, will cause modules to be 1075# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 1076# the default option --strip-debug will be used. Otherwise, 1077# INSTALL_MOD_STRIP value will be used as the options to the strip command. 1078 1079ifdef INSTALL_MOD_STRIP 1080ifeq ($(INSTALL_MOD_STRIP),1) 1081mod_strip_cmd = $(STRIP) --strip-debug 1082else 1083mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 1084endif # INSTALL_MOD_STRIP=1 1085else 1086mod_strip_cmd = true 1087endif # INSTALL_MOD_STRIP 1088export mod_strip_cmd 1089 1090# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 1091# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 1092# or CONFIG_MODULE_COMPRESS_XZ. 1093 1094mod_compress_cmd = true 1095ifdef CONFIG_MODULE_COMPRESS 1096 ifdef CONFIG_MODULE_COMPRESS_GZIP 1097 mod_compress_cmd = $(KGZIP) -n -f 1098 endif # CONFIG_MODULE_COMPRESS_GZIP 1099 ifdef CONFIG_MODULE_COMPRESS_XZ 1100 mod_compress_cmd = $(XZ) -f 1101 endif # CONFIG_MODULE_COMPRESS_XZ 1102endif # CONFIG_MODULE_COMPRESS 1103export mod_compress_cmd 1104 1105ifdef CONFIG_MODULE_SIG_ALL 1106$(eval $(call config_filename,MODULE_SIG_KEY)) 1107 1108mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 1109else 1110mod_sign_cmd = true 1111endif 1112export mod_sign_cmd 1113 1114HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 1115 1116has_libelf = $(call try-run,\ 1117 echo "int main() {}" | $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 1118 1119ifdef CONFIG_STACK_VALIDATION 1120 ifeq ($(has_libelf),1) 1121 objtool_target := tools/objtool FORCE 1122 else 1123 SKIP_STACK_VALIDATION := 1 1124 export SKIP_STACK_VALIDATION 1125 endif 1126endif 1127 1128PHONY += resolve_btfids_clean 1129 1130resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1131 1132# tools/bpf/resolve_btfids directory might not exist 1133# in output directory, skip its clean in that case 1134resolve_btfids_clean: 1135ifneq ($(wildcard $(resolve_btfids_O)),) 1136 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1137endif 1138 1139ifdef CONFIG_BPF 1140ifdef CONFIG_DEBUG_INFO_BTF 1141 ifeq ($(has_libelf),1) 1142 resolve_btfids_target := tools/bpf/resolve_btfids FORCE 1143 else 1144 ERROR_RESOLVE_BTFIDS := 1 1145 endif 1146endif # CONFIG_DEBUG_INFO_BTF 1147endif # CONFIG_BPF 1148 1149PHONY += prepare0 1150 1151export MODORDER := $(extmod-prefix)modules.order 1152export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps 1153 1154ifeq ($(KBUILD_EXTMOD),) 1155core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 1156 1157vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1158 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1159 $(libs-y) $(libs-m))) 1160 1161vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1162 $(patsubst %/,%,$(filter %/, $(core-) \ 1163 $(drivers-) $(libs-)))) 1164 1165subdir-modorder := $(addsuffix modules.order,$(filter %/, \ 1166 $(core-y) $(core-m) $(libs-y) $(libs-m) \ 1167 $(drivers-y) $(drivers-m))) 1168 1169build-dirs := $(vmlinux-dirs) 1170clean-dirs := $(vmlinux-alldirs) 1171 1172# Externally visible symbols (used by link-vmlinux.sh) 1173KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1174KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1175ifdef CONFIG_MODULES 1176KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1177KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1178else 1179KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1180endif 1181KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1182 1183export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1184export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1185# used by scripts/Makefile.package 1186export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1187 1188vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1189 1190# Recurse until adjust_autoksyms.sh is satisfied 1191PHONY += autoksyms_recursive 1192ifdef CONFIG_TRIM_UNUSED_KSYMS 1193# For the kernel to actually contain only the needed exported symbols, 1194# we have to build modules as well to determine what those symbols are. 1195# (this can be evaluated only once include/config/auto.conf has been included) 1196KBUILD_MODULES := 1 1197 1198autoksyms_recursive: descend modules.order 1199 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1200 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1201endif 1202 1203autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1204 1205quiet_cmd_autoksyms_h = GEN $@ 1206 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1207 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1208 1209$(autoksyms_h): 1210 $(call cmd,autoksyms_h) 1211 1212ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1213 1214# Final link of vmlinux with optional arch pass after final link 1215cmd_link-vmlinux = \ 1216 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \ 1217 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1218 1219vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1220 +$(call if_changed,link-vmlinux) 1221 1222targets := vmlinux 1223 1224# The actual objects are generated when descending, 1225# make sure no implicit rule kicks in 1226$(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1227 1228filechk_kernel.release = \ 1229 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1230 1231# Store (new) KERNELRELEASE string in include/config/kernel.release 1232include/config/kernel.release: FORCE 1233 $(call filechk,kernel.release) 1234 1235# Additional helpers built in scripts/ 1236# Carefully list dependencies so we do not try to build scripts twice 1237# in parallel 1238PHONY += scripts 1239scripts: scripts_basic scripts_dtc 1240 $(Q)$(MAKE) $(build)=$(@) 1241 1242# Things we need to do before we recursively start building the kernel 1243# or the modules are listed in "prepare". 1244# A multi level approach is used. prepareN is processed before prepareN-1. 1245# archprepare is used in arch Makefiles and when processed asm symlink, 1246# version.h and scripts_basic is processed / created. 1247 1248PHONY += prepare archprepare 1249 1250archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1251 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1252 include/generated/autoconf.h 1253 1254prepare0: archprepare 1255 $(Q)$(MAKE) $(build)=scripts/mod 1256 $(Q)$(MAKE) $(build)=. 1257 1258# All the preparing.. 1259prepare: prepare0 prepare-objtool prepare-resolve_btfids 1260 1261# Support for using generic headers in asm-generic 1262asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1263 1264PHONY += asm-generic uapi-asm-generic 1265asm-generic: uapi-asm-generic 1266 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1267 generic=include/asm-generic 1268uapi-asm-generic: 1269 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1270 generic=include/uapi/asm-generic 1271 1272PHONY += prepare-objtool prepare-resolve_btfids 1273prepare-objtool: $(objtool_target) 1274ifeq ($(SKIP_STACK_VALIDATION),1) 1275ifdef CONFIG_UNWINDER_ORC 1276 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1277 @false 1278else 1279 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1280endif 1281endif 1282 1283prepare-resolve_btfids: $(resolve_btfids_target) 1284ifeq ($(ERROR_RESOLVE_BTFIDS),1) 1285 @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1286 @false 1287endif 1288# Generate some files 1289# --------------------------------------------------------------------------- 1290 1291# KERNELRELEASE can change from a few different places, meaning version.h 1292# needs to be updated, so this check is forced on all builds 1293 1294uts_len := 64 1295define filechk_utsrelease.h 1296 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1297 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1298 exit 1; \ 1299 fi; \ 1300 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1301endef 1302 1303define filechk_version.h 1304 if [ $(SUBLEVEL) -gt 255 ]; then \ 1305 echo \#define LINUX_VERSION_CODE $(shell \ 1306 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1307 else \ 1308 echo \#define LINUX_VERSION_CODE $(shell \ 1309 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1310 fi; \ 1311 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1312 ((c) > 255 ? 255 : (c)))' 1313endef 1314 1315$(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0) 1316$(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0) 1317$(version_h): FORCE 1318 $(call filechk,version.h) 1319 $(Q)rm -f $(old_version_h) 1320 1321include/generated/utsrelease.h: include/config/kernel.release FORCE 1322 $(call filechk,utsrelease.h) 1323 1324PHONY += headerdep 1325headerdep: 1326 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1327 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1328 1329# --------------------------------------------------------------------------- 1330# Kernel headers 1331 1332#Default location for installed headers 1333export INSTALL_HDR_PATH = $(objtree)/usr 1334 1335quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1336 cmd_headers_install = \ 1337 mkdir -p $(INSTALL_HDR_PATH); \ 1338 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1339 usr/include $(INSTALL_HDR_PATH) 1340 1341PHONY += headers_install 1342headers_install: headers 1343 $(call cmd,headers_install) 1344 1345PHONY += archheaders archscripts 1346 1347hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1348 1349PHONY += headers 1350headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1351 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1352 $(error Headers not exportable for the $(SRCARCH) architecture)) 1353 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1354 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1355 1356# Deprecated. It is no-op now. 1357PHONY += headers_check 1358headers_check: 1359 @: 1360 1361ifdef CONFIG_HEADERS_INSTALL 1362prepare: headers 1363endif 1364 1365PHONY += scripts_unifdef 1366scripts_unifdef: scripts_basic 1367 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1368 1369# --------------------------------------------------------------------------- 1370# Kernel selftest 1371 1372PHONY += kselftest 1373kselftest: 1374 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1375 1376kselftest-%: FORCE 1377 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1378 1379PHONY += kselftest-merge 1380kselftest-merge: 1381 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1382 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1383 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1384 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1385 1386# --------------------------------------------------------------------------- 1387# Devicetree files 1388 1389ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1390dtstree := arch/$(SRCARCH)/boot/dts 1391endif 1392 1393ifneq ($(dtstree),) 1394 1395%.dtb: include/config/kernel.release scripts_dtc 1396 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1397 1398PHONY += dtbs dtbs_install dtbs_check 1399dtbs: include/config/kernel.release scripts_dtc 1400 $(Q)$(MAKE) $(build)=$(dtstree) 1401 1402ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1403export CHECK_DTBS=y 1404dtbs: dt_binding_check 1405endif 1406 1407dtbs_check: dtbs 1408 1409dtbs_install: 1410 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1411 1412ifdef CONFIG_OF_EARLY_FLATTREE 1413all: dtbs 1414endif 1415 1416endif 1417 1418PHONY += scripts_dtc 1419scripts_dtc: scripts_basic 1420 $(Q)$(MAKE) $(build)=scripts/dtc 1421 1422ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1423export CHECK_DT_BINDING=y 1424endif 1425 1426PHONY += dt_binding_check 1427dt_binding_check: scripts_dtc 1428 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1429 1430# --------------------------------------------------------------------------- 1431# Modules 1432 1433ifdef CONFIG_MODULES 1434 1435# By default, build modules as well 1436 1437all: modules 1438 1439# When we're building modules with modversions, we need to consider 1440# the built-in objects during the descend as well, in order to 1441# make sure the checksums are up to date before we record them. 1442ifdef CONFIG_MODVERSIONS 1443 KBUILD_BUILTIN := 1 1444endif 1445 1446# Build modules 1447# 1448# A module can be listed more than once in obj-m resulting in 1449# duplicate lines in modules.order files. Those are removed 1450# using awk while concatenating to the final file. 1451 1452PHONY += modules 1453modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare 1454 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1455 1456PHONY += modules_check 1457modules_check: modules.order 1458 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1459 1460cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1461 1462modules.order: $(subdir-modorder) FORCE 1463 $(call if_changed,modules_order) 1464 1465targets += modules.order 1466 1467# Target to prepare building external modules 1468PHONY += modules_prepare 1469modules_prepare: prepare 1470 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1471 1472# Target to install modules 1473PHONY += modules_install 1474modules_install: _modinst_ _modinst_post 1475 1476PHONY += _modinst_ 1477_modinst_: 1478 @rm -rf $(MODLIB)/kernel 1479 @rm -f $(MODLIB)/source 1480 @mkdir -p $(MODLIB)/kernel 1481 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1482 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1483 rm -f $(MODLIB)/build ; \ 1484 ln -s $(CURDIR) $(MODLIB)/build ; \ 1485 fi 1486 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1487 @cp -f modules.builtin $(MODLIB)/ 1488 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1489 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1490 1491# This depmod is only for convenience to give the initial 1492# boot a modules.dep even before / is mounted read-write. However the 1493# boot script depmod is the master version. 1494PHONY += _modinst_post 1495_modinst_post: _modinst_ 1496 $(call cmd,depmod) 1497 1498ifeq ($(CONFIG_MODULE_SIG), y) 1499PHONY += modules_sign 1500modules_sign: 1501 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1502endif 1503 1504else # CONFIG_MODULES 1505 1506# Modules not configured 1507# --------------------------------------------------------------------------- 1508 1509PHONY += modules modules_install 1510modules modules_install: 1511 @echo >&2 1512 @echo >&2 "The present kernel configuration has modules disabled." 1513 @echo >&2 "Type 'make config' and enable loadable module support." 1514 @echo >&2 "Then build a kernel with module support enabled." 1515 @echo >&2 1516 @exit 1 1517 1518endif # CONFIG_MODULES 1519 1520### 1521# Cleaning is done on three levels. 1522# make clean Delete most generated files 1523# Leave enough to build external modules 1524# make mrproper Delete the current configuration, and all generated files 1525# make distclean Remove editor backup files, patch leftover files and the like 1526 1527# Directories & files removed with 'make clean' 1528CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ 1529 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1530 compile_commands.json .thinlto-cache 1531 1532# Directories & files removed with 'make mrproper' 1533MRPROPER_FILES += include/config include/generated \ 1534 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1535 debian snap tar-install \ 1536 .config .config.old .version \ 1537 Module.symvers \ 1538 signing_key.pem signing_key.priv signing_key.x509 \ 1539 x509.genkey extra_certificates signing_key.x509.keyid \ 1540 signing_key.x509.signer vmlinux-gdb.py \ 1541 *.spec 1542 1543# Directories & files removed with 'make distclean' 1544DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS 1545 1546# clean - Delete most, but leave enough to build external modules 1547# 1548clean: rm-files := $(CLEAN_FILES) 1549 1550PHONY += archclean vmlinuxclean 1551 1552vmlinuxclean: 1553 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1554 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1555 1556clean: archclean vmlinuxclean resolve_btfids_clean 1557 1558# mrproper - Delete all generated files, including .config 1559# 1560mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1561mrproper-dirs := $(addprefix _mrproper_,scripts) 1562 1563PHONY += $(mrproper-dirs) mrproper 1564$(mrproper-dirs): 1565 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1566 1567mrproper: clean $(mrproper-dirs) 1568 $(call cmd,rmfiles) 1569 1570# distclean 1571# 1572distclean: rm-files := $(wildcard $(DISTCLEAN_FILES)) 1573 1574PHONY += distclean 1575 1576distclean: mrproper 1577 $(call cmd,rmfiles) 1578 @find $(srctree) $(RCS_FIND_IGNORE) \ 1579 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1580 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1581 -o -name 'core' \) \ 1582 -type f -print | xargs rm -f 1583 1584 1585# Packaging of the kernel to various formats 1586# --------------------------------------------------------------------------- 1587 1588%src-pkg: FORCE 1589 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1590%pkg: include/config/kernel.release FORCE 1591 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1592 1593# Brief documentation of the typical targets used 1594# --------------------------------------------------------------------------- 1595 1596boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1597boards := $(sort $(notdir $(boards))) 1598board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1599board-dirs := $(sort $(notdir $(board-dirs:/=))) 1600 1601PHONY += help 1602help: 1603 @echo 'Cleaning targets:' 1604 @echo ' clean - Remove most generated files but keep the config and' 1605 @echo ' enough build support to build external modules' 1606 @echo ' mrproper - Remove all generated files + config + various backup files' 1607 @echo ' distclean - mrproper + remove editor backup and patch files' 1608 @echo '' 1609 @echo 'Configuration targets:' 1610 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1611 @echo '' 1612 @echo 'Other generic targets:' 1613 @echo ' all - Build all targets marked with [*]' 1614 @echo '* vmlinux - Build the bare kernel' 1615 @echo '* modules - Build all modules' 1616 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1617 @echo ' dir/ - Build all files in dir and below' 1618 @echo ' dir/file.[ois] - Build specified target only' 1619 @echo ' dir/file.ll - Build the LLVM assembly file' 1620 @echo ' (requires compiler support for LLVM assembly generation)' 1621 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1622 @echo ' (requires a recent binutils and recent build (System.map))' 1623 @echo ' dir/file.ko - Build module including final link' 1624 @echo ' modules_prepare - Set up for building external modules' 1625 @echo ' tags/TAGS - Generate tags file for editors' 1626 @echo ' cscope - Generate cscope index' 1627 @echo ' gtags - Generate GNU GLOBAL index' 1628 @echo ' kernelrelease - Output the release version string (use with make -s)' 1629 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1630 @echo ' image_name - Output the image name (use with make -s)' 1631 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1632 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1633 echo '' 1634 @echo 'Static analysers:' 1635 @echo ' checkstack - Generate a list of stack hogs' 1636 @echo ' versioncheck - Sanity check on version.h usage' 1637 @echo ' includecheck - Check for duplicate included header files' 1638 @echo ' export_report - List the usages of all exported symbols' 1639 @echo ' headerdep - Detect inclusion cycles in headers' 1640 @echo ' coccicheck - Check with Coccinelle' 1641 @echo ' clang-analyzer - Check with clang static analyzer' 1642 @echo ' clang-tidy - Check with clang-tidy' 1643 @echo '' 1644 @echo 'Tools:' 1645 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1646 @echo '' 1647 @echo 'Kernel selftest:' 1648 @echo ' kselftest - Build and run kernel selftest' 1649 @echo ' Build, install, and boot kernel before' 1650 @echo ' running kselftest on it' 1651 @echo ' Run as root for full coverage' 1652 @echo ' kselftest-all - Build kernel selftest' 1653 @echo ' kselftest-install - Build and install kernel selftest' 1654 @echo ' kselftest-clean - Remove all generated kselftest files' 1655 @echo ' kselftest-merge - Merge all the config dependencies of' 1656 @echo ' kselftest to existing .config.' 1657 @echo '' 1658 @$(if $(dtstree), \ 1659 echo 'Devicetree:'; \ 1660 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1661 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1662 echo ' dt_binding_check - Validate device tree binding documents'; \ 1663 echo ' dtbs_check - Validate device tree source files';\ 1664 echo '') 1665 1666 @echo 'Userspace tools targets:' 1667 @echo ' use "make tools/help"' 1668 @echo ' or "cd tools; make help"' 1669 @echo '' 1670 @echo 'Kernel packaging:' 1671 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1672 @echo '' 1673 @echo 'Documentation targets:' 1674 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1675 @echo '' 1676 @echo 'Architecture specific targets ($(SRCARCH)):' 1677 @$(if $(archhelp),$(archhelp),\ 1678 echo ' No architecture specific help defined for $(SRCARCH)') 1679 @echo '' 1680 @$(if $(boards), \ 1681 $(foreach b, $(boards), \ 1682 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1683 echo '') 1684 @$(if $(board-dirs), \ 1685 $(foreach b, $(board-dirs), \ 1686 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1687 printf " %-16s - Show all of the above\\n" help-boards; \ 1688 echo '') 1689 1690 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1691 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1692 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1693 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1694 @echo ' (sparse by default)' 1695 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1696 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1697 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1698 @echo ' 1: warnings which may be relevant and do not occur too often' 1699 @echo ' 2: warnings which occur quite often but may still be relevant' 1700 @echo ' 3: more obscure warnings, can most likely be ignored' 1701 @echo ' Multiple levels can be combined with W=12 or W=123' 1702 @echo '' 1703 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1704 @echo 'For further info see the ./README file' 1705 1706 1707help-board-dirs := $(addprefix help-,$(board-dirs)) 1708 1709help-boards: $(help-board-dirs) 1710 1711boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1712 1713$(help-board-dirs): help-%: 1714 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1715 @$(if $(boards-per-dir), \ 1716 $(foreach b, $(boards-per-dir), \ 1717 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1718 echo '') 1719 1720 1721# Documentation targets 1722# --------------------------------------------------------------------------- 1723DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1724 linkcheckdocs dochelp refcheckdocs 1725PHONY += $(DOC_TARGETS) 1726$(DOC_TARGETS): 1727 $(Q)$(MAKE) $(build)=Documentation $@ 1728 1729# Misc 1730# --------------------------------------------------------------------------- 1731 1732PHONY += scripts_gdb 1733scripts_gdb: prepare0 1734 $(Q)$(MAKE) $(build)=scripts/gdb 1735 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1736 1737ifdef CONFIG_GDB_SCRIPTS 1738all: scripts_gdb 1739endif 1740 1741else # KBUILD_EXTMOD 1742 1743### 1744# External module support. 1745# When building external modules the kernel used as basis is considered 1746# read-only, and no consistency checks are made and the make 1747# system is not used on the basis kernel. If updates are required 1748# in the basis kernel ordinary make commands (without M=...) must 1749# be used. 1750# 1751# The following are the only valid targets when building external 1752# modules. 1753# make M=dir clean Delete all automatically generated files 1754# make M=dir modules Make all modules in specified dir 1755# make M=dir Same as 'make M=dir modules' 1756# make M=dir modules_install 1757# Install the modules built in the module directory 1758# Assumes install directory is already created 1759 1760# We are always building only modules. 1761KBUILD_BUILTIN := 1762KBUILD_MODULES := 1 1763 1764build-dirs := $(KBUILD_EXTMOD) 1765PHONY += modules 1766modules: $(MODORDER) 1767 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1768 1769$(MODORDER): descend 1770 @: 1771 1772PHONY += modules_install 1773modules_install: _emodinst_ _emodinst_post 1774 1775install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1776PHONY += _emodinst_ 1777_emodinst_: 1778 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1779 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1780 1781PHONY += _emodinst_post 1782_emodinst_post: _emodinst_ 1783 $(call cmd,depmod) 1784 1785compile_commands.json: $(extmod-prefix)compile_commands.json 1786PHONY += compile_commands.json 1787 1788clean-dirs := $(KBUILD_EXTMOD) 1789clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1790 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1791 1792PHONY += help 1793help: 1794 @echo ' Building external modules.' 1795 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1796 @echo '' 1797 @echo ' modules - default target, build the module(s)' 1798 @echo ' modules_install - install the module' 1799 @echo ' clean - remove generated files in module directory only' 1800 @echo '' 1801 1802# no-op for external module builds 1803PHONY += prepare modules_prepare 1804 1805endif # KBUILD_EXTMOD 1806 1807# Single targets 1808# --------------------------------------------------------------------------- 1809# To build individual files in subdirectories, you can do like this: 1810# 1811# make foo/bar/baz.s 1812# 1813# The supported suffixes for single-target are listed in 'single-targets' 1814# 1815# To build only under specific subdirectories, you can do like this: 1816# 1817# make foo/bar/baz/ 1818 1819ifdef single-build 1820 1821# .ko is special because modpost is needed 1822single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1823single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1824 1825$(single-ko): single_modpost 1826 @: 1827$(single-no-ko): descend 1828 @: 1829 1830ifeq ($(KBUILD_EXTMOD),) 1831# For the single build of in-tree modules, use a temporary file to avoid 1832# the situation of modules_install installing an invalid modules.order. 1833MODORDER := .modules.tmp 1834endif 1835 1836PHONY += single_modpost 1837single_modpost: $(single-no-ko) modules_prepare 1838 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER) 1839 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1840 1841KBUILD_MODULES := 1 1842 1843export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko)) 1844 1845# trim unrelated directories 1846build-dirs := $(foreach d, $(build-dirs), \ 1847 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1848 1849endif 1850 1851ifndef CONFIG_MODULES 1852KBUILD_MODULES := 1853endif 1854 1855# Handle descending into subdirectories listed in $(build-dirs) 1856# Preset locale variables to speed up the build process. Limit locale 1857# tweaks to this spot to avoid wrong language settings when running 1858# make menuconfig etc. 1859# Error messages still appears in the original language 1860PHONY += descend $(build-dirs) 1861descend: $(build-dirs) 1862$(build-dirs): prepare 1863 $(Q)$(MAKE) $(build)=$@ \ 1864 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ 1865 need-builtin=1 need-modorder=1 1866 1867clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1868PHONY += $(clean-dirs) clean 1869$(clean-dirs): 1870 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1871 1872clean: $(clean-dirs) 1873 $(call cmd,rmfiles) 1874 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1875 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1876 -o -name '*.ko.*' \ 1877 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1878 -o -name '*.dwo' -o -name '*.lst' \ 1879 -o -name '*.su' -o -name '*.mod' \ 1880 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1881 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1882 -o -name '*.asn1.[ch]' \ 1883 -o -name '*.symtypes' -o -name 'modules.order' \ 1884 -o -name '.tmp_*.o.*' \ 1885 -o -name '*.c.[012]*.*' \ 1886 -o -name '*.ll' \ 1887 -o -name '*.gcno' \ 1888 -o -name '*.*.symversions' \) -type f -print | xargs rm -f 1889 1890# Generate tags for editors 1891# --------------------------------------------------------------------------- 1892quiet_cmd_tags = GEN $@ 1893 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1894 1895tags TAGS cscope gtags: FORCE 1896 $(call cmd,tags) 1897 1898# Script to generate missing namespace dependencies 1899# --------------------------------------------------------------------------- 1900 1901PHONY += nsdeps 1902nsdeps: export KBUILD_NSDEPS=1 1903nsdeps: modules 1904 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1905 1906# Clang Tooling 1907# --------------------------------------------------------------------------- 1908 1909quiet_cmd_gen_compile_commands = GEN $@ 1910 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1911 1912$(extmod-prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1913 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \ 1914 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1915 $(call if_changed,gen_compile_commands) 1916 1917targets += $(extmod-prefix)compile_commands.json 1918 1919PHONY += clang-tidy clang-analyzer 1920 1921ifdef CONFIG_CC_IS_CLANG 1922quiet_cmd_clang_tools = CHECK $< 1923 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1924 1925clang-tidy clang-analyzer: $(extmod-prefix)compile_commands.json 1926 $(call cmd,clang_tools) 1927else 1928clang-tidy clang-analyzer: 1929 @echo "$@ requires CC=clang" >&2 1930 @false 1931endif 1932 1933# Scripts to check various things for consistency 1934# --------------------------------------------------------------------------- 1935 1936PHONY += includecheck versioncheck coccicheck export_report 1937 1938includecheck: 1939 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1940 -name '*.[hcS]' -type f -print | sort \ 1941 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1942 1943versioncheck: 1944 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1945 -name '*.[hcS]' -type f -print | sort \ 1946 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1947 1948coccicheck: 1949 $(Q)$(BASH) $(srctree)/scripts/$@ 1950 1951export_report: 1952 $(PERL) $(srctree)/scripts/export_report.pl 1953 1954PHONY += checkstack kernelrelease kernelversion image_name 1955 1956# UML needs a little special treatment here. It wants to use the host 1957# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1958# else wants $(ARCH), including people doing cross-builds, which means 1959# that $(SUBARCH) doesn't work here. 1960ifeq ($(ARCH), um) 1961CHECKSTACK_ARCH := $(SUBARCH) 1962else 1963CHECKSTACK_ARCH := $(ARCH) 1964endif 1965checkstack: 1966 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1967 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1968 1969kernelrelease: 1970 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1971 1972kernelversion: 1973 @echo $(KERNELVERSION) 1974 1975image_name: 1976 @echo $(KBUILD_IMAGE) 1977 1978# Clear a bunch of variables before executing the submake 1979 1980ifeq ($(quiet),silent_) 1981tools_silent=s 1982endif 1983 1984tools/: FORCE 1985 $(Q)mkdir -p $(objtree)/tools 1986 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1987 1988tools/%: FORCE 1989 $(Q)mkdir -p $(objtree)/tools 1990 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1991 1992quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1993 cmd_rmfiles = rm -rf $(rm-files) 1994 1995# Run depmod only if we have System.map and depmod is executable 1996quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1997 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1998 $(KERNELRELEASE) 1999 2000# read saved command lines for existing targets 2001existing-targets := $(wildcard $(sort $(targets))) 2002 2003-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2004 2005endif # config-build 2006endif # mixed-build 2007endif # need-sub-make 2008 2009PHONY += FORCE 2010FORCE: 2011 2012# Declare the contents of the PHONY variable as phony. We keep that 2013# information in a variable so we can use it in if_changed and friends. 2014.PHONY: $(PHONY) 2015