1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 10 4SUBLEVEL = 165 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 469PAHOLE_FLAGS = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh) 470 471CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 472 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 473NOSTDINC_FLAGS := 474CFLAGS_MODULE = 475AFLAGS_MODULE = 476LDFLAGS_MODULE = 477CFLAGS_KERNEL = 478AFLAGS_KERNEL = 479LDFLAGS_vmlinux = 480 481# Use USERINCLUDE when you must reference the UAPI directories only. 482USERINCLUDE := \ 483 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 484 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 485 -I$(srctree)/include/uapi \ 486 -I$(objtree)/include/generated/uapi \ 487 -include $(srctree)/include/linux/kconfig.h 488 489# Use LINUXINCLUDE when you must reference the include/ directory. 490# Needed to be compatible with the O= option 491LINUXINCLUDE := \ 492 -I$(srctree)/arch/$(SRCARCH)/include \ 493 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 494 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 495 -I$(objtree)/include \ 496 $(USERINCLUDE) 497 498KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 499KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 500 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 501 -Werror=implicit-function-declaration -Werror=implicit-int \ 502 -Werror=return-type -Wno-format-security \ 503 -std=gnu89 504KBUILD_CPPFLAGS := -D__KERNEL__ 505KBUILD_AFLAGS_KERNEL := 506KBUILD_CFLAGS_KERNEL := 507KBUILD_AFLAGS_MODULE := -DMODULE 508KBUILD_CFLAGS_MODULE := -DMODULE 509KBUILD_LDFLAGS_MODULE := 510KBUILD_LDFLAGS := 511CLANG_FLAGS := 512 513export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 514export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 515export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 516export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 517export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 518 519export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 520export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 521export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 522export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 523export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 524export PAHOLE_FLAGS 525 526# Files to ignore in find ... statements 527 528export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 529 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 530 -prune -o 531export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 532 --exclude CVS --exclude .pc --exclude .hg --exclude .git 533 534# =========================================================================== 535# Rules shared between *config targets and build targets 536 537# Basic helpers built in scripts/basic/ 538PHONY += scripts_basic 539scripts_basic: 540 $(Q)$(MAKE) $(build)=scripts/basic 541 $(Q)rm -f .tmp_quiet_recordmcount 542 543PHONY += outputmakefile 544# Before starting out-of-tree build, make sure the source tree is clean. 545# outputmakefile generates a Makefile in the output directory, if using a 546# separate output directory. This allows convenient use of make in the 547# output directory. 548# At the same time when output Makefile generated, generate .gitignore to 549# ignore whole output directory 550outputmakefile: 551ifdef building_out_of_srctree 552 $(Q)if [ -f $(srctree)/.config -o \ 553 -d $(srctree)/include/config -o \ 554 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 555 echo >&2 "***"; \ 556 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 557 echo >&2 "*** in $(abs_srctree)";\ 558 echo >&2 "***"; \ 559 false; \ 560 fi 561 $(Q)ln -fsn $(srctree) source 562 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 563 $(Q)test -e .gitignore || \ 564 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 565endif 566 567ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),) 568ifneq ($(CROSS_COMPILE),) 569CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) 570GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 571CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE)) 572GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) 573endif 574ifneq ($(GCC_TOOLCHAIN),) 575CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) 576endif 577ifneq ($(LLVM_IAS),1) 578CLANG_FLAGS += -no-integrated-as 579endif 580CLANG_FLAGS += -Werror=unknown-warning-option 581KBUILD_CFLAGS += $(CLANG_FLAGS) 582KBUILD_AFLAGS += $(CLANG_FLAGS) 583export CLANG_FLAGS 584endif 585 586# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 587# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 588# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 589# and from include/config/auto.conf.cmd to detect the compiler upgrade. 590CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1) 591 592ifdef config-build 593# =========================================================================== 594# *config targets only - make sure prerequisites are updated, and descend 595# in scripts/kconfig to make the *config target 596 597# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 598# KBUILD_DEFCONFIG may point out an alternative default configuration 599# used for 'make defconfig' 600include arch/$(SRCARCH)/Makefile 601export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 602 603config: outputmakefile scripts_basic FORCE 604 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 605 606%config: outputmakefile scripts_basic FORCE 607 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 608 609else #!config-build 610# =========================================================================== 611# Build targets only - this includes vmlinux, arch specific targets, clean 612# targets and others. In general all targets except *config targets. 613 614# If building an external module we do not care about the all: rule 615# but instead __all depend on modules 616PHONY += all 617ifeq ($(KBUILD_EXTMOD),) 618__all: all 619else 620__all: modules 621endif 622 623# Decide whether to build built-in, modular, or both. 624# Normally, just do built-in. 625 626KBUILD_MODULES := 627KBUILD_BUILTIN := 1 628 629# If we have only "make modules", don't compile built-in objects. 630ifeq ($(MAKECMDGOALS),modules) 631 KBUILD_BUILTIN := 632endif 633 634# If we have "make <whatever> modules", compile modules 635# in addition to whatever we do anyway. 636# Just "make" or "make all" shall build modules as well 637 638ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 639 KBUILD_MODULES := 1 640endif 641 642ifeq ($(MAKECMDGOALS),) 643 KBUILD_MODULES := 1 644endif 645 646export KBUILD_MODULES KBUILD_BUILTIN 647 648ifdef need-config 649include include/config/auto.conf 650endif 651 652ifeq ($(KBUILD_EXTMOD),) 653# Objects we will link into vmlinux / subdirs we need to visit 654core-y := init/ usr/ 655drivers-y := drivers/ sound/ 656drivers-$(CONFIG_SAMPLES) += samples/ 657drivers-y += net/ virt/ 658libs-y := lib/ 659vendor-$(CONFIG_OHOS_VENDOR) := vendor/ 660endif # KBUILD_EXTMOD 661 662# The all: target is the default when no target is given on the 663# command line. 664# This allow a user to issue only 'make' to build a kernel including modules 665# Defaults to vmlinux, but the arch makefile usually adds further targets 666all: vmlinux 667 668CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 669 $(call cc-option,-fno-tree-loop-im) \ 670 $(call cc-disable-warning,maybe-uninitialized,) 671export CFLAGS_GCOV 672 673# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 674ifdef CONFIG_FUNCTION_TRACER 675 CC_FLAGS_FTRACE := -pg 676endif 677 678ifdef CONFIG_CC_IS_GCC 679RETPOLINE_CFLAGS := $(call cc-option,-mindirect-branch=thunk-extern -mindirect-branch-register) 680RETPOLINE_CFLAGS += $(call cc-option,-mindirect-branch-cs-prefix) 681RETPOLINE_VDSO_CFLAGS := $(call cc-option,-mindirect-branch=thunk-inline -mindirect-branch-register) 682endif 683ifdef CONFIG_CC_IS_CLANG 684RETPOLINE_CFLAGS := -mretpoline-external-thunk 685RETPOLINE_VDSO_CFLAGS := -mretpoline 686endif 687 688ifdef CONFIG_RETHUNK 689RETHUNK_CFLAGS := -mfunction-return=thunk-extern 690RETPOLINE_CFLAGS += $(RETHUNK_CFLAGS) 691endif 692 693export RETPOLINE_CFLAGS 694export RETPOLINE_VDSO_CFLAGS 695 696include arch/$(SRCARCH)/Makefile 697 698ifdef need-config 699ifdef may-sync-config 700# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 701# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 702# because some architectures define CROSS_COMPILE there. 703include include/config/auto.conf.cmd 704 705$(KCONFIG_CONFIG): 706 @echo >&2 '***' 707 @echo >&2 '*** Configuration file "$@" not found!' 708 @echo >&2 '***' 709 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 710 @echo >&2 '*** "make menuconfig" or "make xconfig").' 711 @echo >&2 '***' 712 @/bin/false 713 714# The actual configuration files used during the build are stored in 715# include/generated/ and include/config/. Update them if .config is newer than 716# include/config/auto.conf (which mirrors .config). 717# 718# This exploits the 'multi-target pattern rule' trick. 719# The syncconfig should be executed only once to make all the targets. 720# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 721# 722# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 723# so you cannot notice that Kconfig is waiting for the user input. 724%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 725 $(Q)$(kecho) " SYNC $@" 726 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 727else # !may-sync-config 728# External modules and some install targets need include/generated/autoconf.h 729# and include/config/auto.conf but do not care if they are up-to-date. 730# Use auto.conf to trigger the test 731PHONY += include/config/auto.conf 732 733include/config/auto.conf: 734 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 735 echo >&2; \ 736 echo >&2 " ERROR: Kernel configuration is invalid."; \ 737 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 738 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 739 echo >&2 ; \ 740 /bin/false) 741 742endif # may-sync-config 743endif # need-config 744 745KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 746KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 747KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 748KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 749KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 750 751ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 752KBUILD_CFLAGS += -O2 753else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 754KBUILD_CFLAGS += -O3 755else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 756KBUILD_CFLAGS += -Os 757endif 758 759# Tell gcc to never replace conditional load with a non-conditional one 760KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 761KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 762 763ifdef CONFIG_READABLE_ASM 764# Disable optimizations that make assembler listings hard to read. 765# reorder blocks reorders the control in the function 766# ipa clone creates specialized cloned functions 767# partial inlining inlines only parts of functions 768KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 769 $(call cc-option,-fno-ipa-cp-clone,) \ 770 $(call cc-option,-fno-partial-inlining) 771endif 772 773ifneq ($(CONFIG_FRAME_WARN),0) 774KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 775endif 776 777stackp-flags-y := -fno-stack-protector 778stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 779stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 780 781KBUILD_CFLAGS += $(stackp-flags-y) 782 783ifdef CONFIG_CC_IS_CLANG 784KBUILD_CPPFLAGS += -Qunused-arguments 785KBUILD_CFLAGS += -Wno-format-invalid-specifier 786KBUILD_CFLAGS += -Wno-gnu 787# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 788# source of a reference will be _MergedGlobals and not on of the whitelisted names. 789# See modpost pattern 2 790KBUILD_CFLAGS += -mno-global-merge 791else 792 793# Warn about unmarked fall-throughs in switch statement. 794# Disabled for clang while comment to attribute conversion happens and 795# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed. 796KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,) 797endif 798 799# These warnings generated too much noise in a regular build. 800# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 801KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 802 803KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 804ifdef CONFIG_FRAME_POINTER 805KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 806else 807# Some targets (ARM with Thumb2, for example), can't be built with frame 808# pointers. For those, we don't have FUNCTION_TRACER automatically 809# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 810# incompatible with -fomit-frame-pointer with current GCC, so we don't use 811# -fomit-frame-pointer with FUNCTION_TRACER. 812ifndef CONFIG_FUNCTION_TRACER 813KBUILD_CFLAGS += -fomit-frame-pointer 814endif 815endif 816 817# Initialize all stack variables with a 0xAA pattern. 818ifdef CONFIG_INIT_STACK_ALL_PATTERN 819KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 820endif 821 822# Initialize all stack variables with a zero value. 823ifdef CONFIG_INIT_STACK_ALL_ZERO 824KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 825ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 826# https://github.com/llvm/llvm-project/issues/44842 827KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 828endif 829endif 830 831DEBUG_CFLAGS := 832 833# Workaround for GCC versions < 5.0 834# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801 835ifdef CONFIG_CC_IS_GCC 836DEBUG_CFLAGS += $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments)) 837endif 838 839ifdef CONFIG_DEBUG_INFO 840 841ifdef CONFIG_DEBUG_INFO_SPLIT 842DEBUG_CFLAGS += -gsplit-dwarf 843else 844DEBUG_CFLAGS += -g 845endif 846 847ifeq ($(LLVM_IAS),1) 848KBUILD_AFLAGS += -g 849else 850KBUILD_AFLAGS += -Wa,-gdwarf-2 851endif 852 853ifdef CONFIG_DEBUG_INFO_DWARF4 854DEBUG_CFLAGS += -gdwarf-4 855endif 856 857ifdef CONFIG_DEBUG_INFO_REDUCED 858DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 859 $(call cc-option,-fno-var-tracking) 860endif 861 862ifdef CONFIG_DEBUG_INFO_COMPRESSED 863DEBUG_CFLAGS += -gz=zlib 864KBUILD_AFLAGS += -gz=zlib 865KBUILD_LDFLAGS += --compress-debug-sections=zlib 866endif 867 868endif # CONFIG_DEBUG_INFO 869 870KBUILD_CFLAGS += $(DEBUG_CFLAGS) 871export DEBUG_CFLAGS 872 873ifdef CONFIG_FUNCTION_TRACER 874ifdef CONFIG_FTRACE_MCOUNT_USE_CC 875 CC_FLAGS_FTRACE += -mrecord-mcount 876 ifdef CONFIG_HAVE_NOP_MCOUNT 877 ifeq ($(call cc-option-yn, -mnop-mcount),y) 878 CC_FLAGS_FTRACE += -mnop-mcount 879 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 880 endif 881 endif 882endif 883ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 884 ifdef CONFIG_HAVE_C_RECORDMCOUNT 885 BUILD_C_RECORDMCOUNT := y 886 export BUILD_C_RECORDMCOUNT 887 endif 888endif 889ifdef CONFIG_HAVE_FENTRY 890 ifeq ($(call cc-option-yn, -mfentry),y) 891 CC_FLAGS_FTRACE += -mfentry 892 CC_FLAGS_USING += -DCC_USING_FENTRY 893 endif 894endif 895export CC_FLAGS_FTRACE 896KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 897KBUILD_AFLAGS += $(CC_FLAGS_USING) 898endif 899 900# We trigger additional mismatches with less inlining 901ifdef CONFIG_DEBUG_SECTION_MISMATCH 902KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 903endif 904 905ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 906KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 907LDFLAGS_vmlinux += --gc-sections 908endif 909 910ifdef CONFIG_SHADOW_CALL_STACK 911CC_FLAGS_SCS := -fsanitize=shadow-call-stack 912KBUILD_CFLAGS += $(CC_FLAGS_SCS) 913export CC_FLAGS_SCS 914endif 915 916ifdef CONFIG_LTO_CLANG 917ifdef CONFIG_LTO_CLANG_THIN 918CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 919KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod-prefix).thinlto-cache 920else 921CC_FLAGS_LTO := -flto 922endif 923CC_FLAGS_LTO += -fvisibility=hidden 924 925# Limit inlining across translation units to reduce binary size 926KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 927endif 928 929ifdef CONFIG_LTO 930KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 931KBUILD_AFLAGS += -fno-lto 932export CC_FLAGS_LTO 933endif 934 935ifdef CONFIG_CFI_CLANG 936CC_FLAGS_CFI := -fsanitize=cfi \ 937 -fsanitize-cfi-cross-dso \ 938 -fno-sanitize-cfi-canonical-jump-tables \ 939 -fno-sanitize-trap=cfi \ 940 -fno-sanitize-blacklist 941 942ifdef CONFIG_CFI_PERMISSIVE 943CC_FLAGS_CFI += -fsanitize-recover=cfi 944endif 945 946# If LTO flags are filtered out, we must also filter out CFI. 947CC_FLAGS_LTO += $(CC_FLAGS_CFI) 948KBUILD_CFLAGS += $(CC_FLAGS_CFI) 949export CC_FLAGS_CFI 950endif 951 952ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B 953KBUILD_CFLAGS += -falign-functions=32 954endif 955 956# arch Makefile may override CC so keep this after arch Makefile is included 957NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 958 959# warn about C99 declaration after statement 960KBUILD_CFLAGS += -Wdeclaration-after-statement 961 962# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 963KBUILD_CFLAGS += -Wvla 964 965# disable pointer signed / unsigned warnings in gcc 4.0 966KBUILD_CFLAGS += -Wno-pointer-sign 967 968# disable stringop warnings in gcc 8+ 969KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 970 971# We'll want to enable this eventually, but it's not going away for 5.7 at least 972KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 973KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) 974KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 975 976# Another good warning that we'll want to enable eventually 977KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 978 979# Enabled with W=2, disabled by default as noisy 980KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized) 981 982# disable invalid "can't wrap" optimizations for signed / pointers 983KBUILD_CFLAGS += -fno-strict-overflow 984 985# Make sure -fstack-check isn't enabled (like gentoo apparently did) 986KBUILD_CFLAGS += -fno-stack-check 987 988# conserve stack if available 989KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 990 991# Prohibit date/time macros, which would make the build non-deterministic 992KBUILD_CFLAGS += -Werror=date-time 993 994# enforce correct pointer usage 995KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 996 997# Require designated initializers for all marked structures 998KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 999 1000# change __FILE__ to the relative path from the srctree 1001KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1002 1003# include additional Makefiles when needed 1004include-y := scripts/Makefile.extrawarn 1005include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1006include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1007include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1008include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1009include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1010 1011include $(addprefix $(srctree)/, $(include-y)) 1012 1013# scripts/Makefile.gcc-plugins is intentionally included last. 1014# Do not add $(call cc-option,...) below this line. When you build the kernel 1015# from the clean source tree, the GCC plugins do not exist at this point. 1016 1017# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 1018KBUILD_CPPFLAGS += $(KCPPFLAGS) 1019KBUILD_AFLAGS += $(KAFLAGS) 1020KBUILD_CFLAGS += $(KCFLAGS) 1021 1022KBUILD_LDFLAGS_MODULE += --build-id=sha1 1023LDFLAGS_vmlinux += --build-id=sha1 1024 1025KBUILD_LDFLAGS += -z noexecstack 1026KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1027 1028ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1029LDFLAGS_vmlinux += $(call ld-option, -X,) 1030endif 1031 1032ifeq ($(CONFIG_RELR),y) 1033LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags 1034endif 1035 1036# We never want expected sections to be placed heuristically by the 1037# linker. All sections should be explicitly named in the linker script. 1038ifdef CONFIG_LD_ORPHAN_WARN 1039LDFLAGS_vmlinux += --orphan-handling=warn 1040endif 1041 1042# Align the bit size of userspace programs with the kernel 1043KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1044KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1045 1046# make the checker run with the right architecture 1047CHECKFLAGS += --arch=$(ARCH) 1048 1049# insure the checker run with the right endianness 1050CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1051 1052# the checker needs the correct machine size 1053CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1054 1055# Default kernel image to build when no specific target is given. 1056# KBUILD_IMAGE may be overruled on the command line or 1057# set in the environment 1058# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1059# this default value 1060export KBUILD_IMAGE ?= vmlinux 1061 1062# 1063# INSTALL_PATH specifies where to place the updated kernel and system map 1064# images. Default is /boot, but you can set it to other values 1065export INSTALL_PATH ?= /boot 1066 1067# 1068# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1069# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1070# an argument if needed. Otherwise it defaults to the kernel install path 1071# 1072export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1073 1074# 1075# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1076# relocations required by build roots. This is not defined in the 1077# makefile but the argument can be passed to make if needed. 1078# 1079 1080MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1081export MODLIB 1082 1083# 1084# INSTALL_MOD_STRIP, if defined, will cause modules to be 1085# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 1086# the default option --strip-debug will be used. Otherwise, 1087# INSTALL_MOD_STRIP value will be used as the options to the strip command. 1088 1089ifdef INSTALL_MOD_STRIP 1090ifeq ($(INSTALL_MOD_STRIP),1) 1091mod_strip_cmd = $(STRIP) --strip-debug 1092else 1093mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 1094endif # INSTALL_MOD_STRIP=1 1095else 1096mod_strip_cmd = true 1097endif # INSTALL_MOD_STRIP 1098export mod_strip_cmd 1099 1100# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 1101# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 1102# or CONFIG_MODULE_COMPRESS_XZ. 1103 1104mod_compress_cmd = true 1105ifdef CONFIG_MODULE_COMPRESS 1106 ifdef CONFIG_MODULE_COMPRESS_GZIP 1107 mod_compress_cmd = $(KGZIP) -n -f 1108 endif # CONFIG_MODULE_COMPRESS_GZIP 1109 ifdef CONFIG_MODULE_COMPRESS_XZ 1110 mod_compress_cmd = $(XZ) -f 1111 endif # CONFIG_MODULE_COMPRESS_XZ 1112endif # CONFIG_MODULE_COMPRESS 1113export mod_compress_cmd 1114 1115ifdef CONFIG_MODULE_SIG_ALL 1116$(eval $(call config_filename,MODULE_SIG_KEY)) 1117 1118mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 1119else 1120mod_sign_cmd = true 1121endif 1122export mod_sign_cmd 1123 1124HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 1125 1126has_libelf = $(call try-run,\ 1127 echo "int main() {}" | $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 1128 1129ifdef CONFIG_STACK_VALIDATION 1130 ifeq ($(has_libelf),1) 1131 objtool_target := tools/objtool FORCE 1132 else 1133 SKIP_STACK_VALIDATION := 1 1134 export SKIP_STACK_VALIDATION 1135 endif 1136endif 1137 1138PHONY += resolve_btfids_clean 1139 1140resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1141 1142# tools/bpf/resolve_btfids directory might not exist 1143# in output directory, skip its clean in that case 1144resolve_btfids_clean: 1145ifneq ($(wildcard $(resolve_btfids_O)),) 1146 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1147endif 1148 1149ifdef CONFIG_BPF 1150ifdef CONFIG_DEBUG_INFO_BTF 1151 ifeq ($(has_libelf),1) 1152 resolve_btfids_target := tools/bpf/resolve_btfids FORCE 1153 else 1154 ERROR_RESOLVE_BTFIDS := 1 1155 endif 1156endif # CONFIG_DEBUG_INFO_BTF 1157endif # CONFIG_BPF 1158 1159PHONY += prepare0 1160 1161export MODORDER := $(extmod-prefix)modules.order 1162export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps 1163 1164ifeq ($(KBUILD_EXTMOD),) 1165core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ io_uring/ 1166 1167vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1168 $(core-y) $(core-m) $(drivers-y) $(drivers-m) $(vendor-y) \ 1169 $(libs-y) $(libs-m))) 1170 1171vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1172 $(patsubst %/,%,$(filter %/, $(core-) \ 1173 $(drivers-) $(vendor-) $(libs-)))) 1174 1175build-dirs := $(vmlinux-dirs) 1176clean-dirs := $(vmlinux-alldirs) 1177 1178subdir-modorder := $(addsuffix /modules.order, $(build-dirs)) 1179 1180# Externally visible symbols (used by link-vmlinux.sh) 1181KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1182KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1183ifdef CONFIG_MODULES 1184KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1185KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1186else 1187KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1188endif 1189KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1190KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(vendor-y)) 1191 1192export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1193export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1194# used by scripts/Makefile.package 1195export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1196 1197vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1198 1199# Recurse until adjust_autoksyms.sh is satisfied 1200PHONY += autoksyms_recursive 1201ifdef CONFIG_TRIM_UNUSED_KSYMS 1202# For the kernel to actually contain only the needed exported symbols, 1203# we have to build modules as well to determine what those symbols are. 1204# (this can be evaluated only once include/config/auto.conf has been included) 1205KBUILD_MODULES := 1 1206 1207autoksyms_recursive: descend modules.order 1208 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1209 "$(MAKE) -f $(srctree)/Makefile autoksyms_recursive" 1210endif 1211 1212autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1213 1214quiet_cmd_autoksyms_h = GEN $@ 1215 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1216 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1217 1218$(autoksyms_h): 1219 $(call cmd,autoksyms_h) 1220 1221ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1222 1223# Final link of vmlinux with optional arch pass after final link 1224cmd_link-vmlinux = \ 1225 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \ 1226 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1227 1228vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1229 +$(call if_changed,link-vmlinux) 1230 1231targets := vmlinux 1232 1233# The actual objects are generated when descending, 1234# make sure no implicit rule kicks in 1235$(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1236 1237filechk_kernel.release = \ 1238 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1239 1240# Store (new) KERNELRELEASE string in include/config/kernel.release 1241include/config/kernel.release: FORCE 1242 $(call filechk,kernel.release) 1243 1244# Additional helpers built in scripts/ 1245# Carefully list dependencies so we do not try to build scripts twice 1246# in parallel 1247PHONY += scripts 1248scripts: scripts_basic scripts_dtc 1249 $(Q)$(MAKE) $(build)=$(@) 1250 1251# Things we need to do before we recursively start building the kernel 1252# or the modules are listed in "prepare". 1253# A multi level approach is used. prepareN is processed before prepareN-1. 1254# archprepare is used in arch Makefiles and when processed asm symlink, 1255# version.h and scripts_basic is processed / created. 1256 1257PHONY += prepare archprepare 1258 1259archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1260 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1261 include/generated/autoconf.h 1262 1263prepare0: archprepare 1264 $(Q)$(MAKE) $(build)=scripts/mod 1265 $(Q)$(MAKE) $(build)=. 1266 1267# All the preparing.. 1268prepare: prepare0 prepare-objtool prepare-resolve_btfids 1269 1270# Support for using generic headers in asm-generic 1271asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1272 1273PHONY += asm-generic uapi-asm-generic 1274asm-generic: uapi-asm-generic 1275 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1276 generic=include/asm-generic 1277uapi-asm-generic: 1278 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1279 generic=include/uapi/asm-generic 1280 1281PHONY += prepare-objtool prepare-resolve_btfids 1282prepare-objtool: $(objtool_target) 1283ifeq ($(SKIP_STACK_VALIDATION),1) 1284ifdef CONFIG_UNWINDER_ORC 1285 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1286 @false 1287else 1288 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1289endif 1290endif 1291 1292prepare-resolve_btfids: $(resolve_btfids_target) 1293ifeq ($(ERROR_RESOLVE_BTFIDS),1) 1294 @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1295 @false 1296endif 1297# Generate some files 1298# --------------------------------------------------------------------------- 1299 1300# KERNELRELEASE can change from a few different places, meaning version.h 1301# needs to be updated, so this check is forced on all builds 1302 1303uts_len := 64 1304define filechk_utsrelease.h 1305 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1306 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1307 exit 1; \ 1308 fi; \ 1309 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1310endef 1311 1312define filechk_version.h 1313 if [ $(SUBLEVEL) -gt 255 ]; then \ 1314 echo \#define LINUX_VERSION_CODE $(shell \ 1315 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1316 else \ 1317 echo \#define LINUX_VERSION_CODE $(shell \ 1318 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1319 fi; \ 1320 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1321 ((c) > 255 ? 255 : (c)))' 1322endef 1323 1324$(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0) 1325$(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0) 1326$(version_h): FORCE 1327 $(call filechk,version.h) 1328 $(Q)rm -f $(old_version_h) 1329 1330include/generated/utsrelease.h: include/config/kernel.release FORCE 1331 $(call filechk,utsrelease.h) 1332 1333PHONY += headerdep 1334headerdep: 1335 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1336 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1337 1338# --------------------------------------------------------------------------- 1339# Kernel headers 1340 1341#Default location for installed headers 1342export INSTALL_HDR_PATH = $(objtree)/usr 1343 1344quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1345 cmd_headers_install = \ 1346 mkdir -p $(INSTALL_HDR_PATH); \ 1347 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1348 usr/include $(INSTALL_HDR_PATH) 1349 1350PHONY += headers_install 1351headers_install: headers 1352 $(call cmd,headers_install) 1353 1354PHONY += archheaders archscripts 1355 1356hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1357 1358PHONY += headers 1359headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1360 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1361 $(error Headers not exportable for the $(SRCARCH) architecture)) 1362 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1363 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1364 1365# Deprecated. It is no-op now. 1366PHONY += headers_check 1367headers_check: 1368 @: 1369 1370ifdef CONFIG_HEADERS_INSTALL 1371prepare: headers 1372endif 1373 1374PHONY += scripts_unifdef 1375scripts_unifdef: scripts_basic 1376 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1377 1378# --------------------------------------------------------------------------- 1379# Kernel selftest 1380 1381PHONY += kselftest 1382kselftest: 1383 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1384 1385kselftest-%: FORCE 1386 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1387 1388PHONY += kselftest-merge 1389kselftest-merge: 1390 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1391 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1392 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1393 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1394 1395# --------------------------------------------------------------------------- 1396# Devicetree files 1397 1398ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1399dtstree := arch/$(SRCARCH)/boot/dts 1400endif 1401 1402ifneq ($(dtstree),) 1403 1404%.dtb: include/config/kernel.release scripts_dtc 1405 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1406 1407PHONY += dtbs dtbs_install dtbs_check 1408dtbs: include/config/kernel.release scripts_dtc 1409 $(Q)$(MAKE) $(build)=$(dtstree) 1410 1411ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1412export CHECK_DTBS=y 1413dtbs: dt_binding_check 1414endif 1415 1416dtbs_check: dtbs 1417 1418dtbs_install: 1419 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1420 1421ifdef CONFIG_OF_EARLY_FLATTREE 1422all: dtbs 1423endif 1424 1425endif 1426 1427PHONY += scripts_dtc 1428scripts_dtc: scripts_basic 1429 $(Q)$(MAKE) $(build)=scripts/dtc 1430 1431ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1432export CHECK_DT_BINDING=y 1433endif 1434 1435PHONY += dt_binding_check 1436dt_binding_check: scripts_dtc 1437 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1438 1439# --------------------------------------------------------------------------- 1440# Modules 1441 1442ifdef CONFIG_MODULES 1443 1444# By default, build modules as well 1445 1446all: modules 1447 1448# When we're building modules with modversions, we need to consider 1449# the built-in objects during the descend as well, in order to 1450# make sure the checksums are up to date before we record them. 1451ifdef CONFIG_MODVERSIONS 1452 KBUILD_BUILTIN := 1 1453endif 1454 1455# Build modules 1456# 1457# A module can be listed more than once in obj-m resulting in 1458# duplicate lines in modules.order files. Those are removed 1459# using awk while concatenating to the final file. 1460 1461PHONY += modules 1462modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare 1463 1464PHONY += modules_check 1465modules_check: modules.order 1466 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1467 1468cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1469 1470modules.order: $(subdir-modorder) FORCE 1471 $(call if_changed,modules_order) 1472 1473targets += modules.order 1474 1475# Target to prepare building external modules 1476PHONY += modules_prepare 1477modules_prepare: prepare 1478 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1479 1480modules_install: __modinst_pre 1481PHONY += __modinst_pre 1482__modinst_pre: 1483 @rm -rf $(MODLIB)/kernel 1484 @rm -f $(MODLIB)/source 1485 @mkdir -p $(MODLIB)/kernel 1486 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1487 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1488 rm -f $(MODLIB)/build ; \ 1489 ln -s $(CURDIR) $(MODLIB)/build ; \ 1490 fi 1491 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1492 @cp -f modules.builtin $(MODLIB)/ 1493 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1494 1495ifeq ($(CONFIG_MODULE_SIG), y) 1496PHONY += modules_sign 1497modules_sign: 1498 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1499endif 1500 1501endif # CONFIG_MODULES 1502 1503### 1504# Cleaning is done on three levels. 1505# make clean Delete most generated files 1506# Leave enough to build external modules 1507# make mrproper Delete the current configuration, and all generated files 1508# make distclean Remove editor backup files, patch leftover files and the like 1509 1510# Directories & files removed with 'make clean' 1511CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ 1512 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1513 compile_commands.json .thinlto-cache 1514 1515# Directories & files removed with 'make mrproper' 1516MRPROPER_FILES += include/config include/generated \ 1517 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1518 debian snap tar-install \ 1519 .config .config.old .version \ 1520 Module.symvers \ 1521 signing_key.pem signing_key.priv signing_key.x509 \ 1522 x509.genkey extra_certificates signing_key.x509.keyid \ 1523 signing_key.x509.signer vmlinux-gdb.py \ 1524 *.spec 1525 1526# Directories & files removed with 'make distclean' 1527DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS 1528 1529# clean - Delete most, but leave enough to build external modules 1530# 1531clean: rm-files := $(CLEAN_FILES) 1532 1533PHONY += archclean vmlinuxclean 1534 1535vmlinuxclean: 1536 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1537 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1538 1539clean: archclean vmlinuxclean resolve_btfids_clean 1540 1541# mrproper - Delete all generated files, including .config 1542# 1543mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1544mrproper-dirs := $(addprefix _mrproper_,scripts) 1545 1546PHONY += $(mrproper-dirs) mrproper 1547$(mrproper-dirs): 1548 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1549 1550mrproper: clean $(mrproper-dirs) 1551 $(call cmd,rmfiles) 1552 1553# distclean 1554# 1555distclean: rm-files := $(wildcard $(DISTCLEAN_FILES)) 1556 1557PHONY += distclean 1558 1559distclean: mrproper 1560 $(call cmd,rmfiles) 1561 @find $(srctree) $(RCS_FIND_IGNORE) \ 1562 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1563 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1564 -o -name 'core' \) \ 1565 -type f -print | xargs rm -f 1566 1567 1568# Packaging of the kernel to various formats 1569# --------------------------------------------------------------------------- 1570 1571%src-pkg: FORCE 1572 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1573%pkg: include/config/kernel.release FORCE 1574 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1575 1576# Brief documentation of the typical targets used 1577# --------------------------------------------------------------------------- 1578 1579boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1580boards := $(sort $(notdir $(boards))) 1581board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1582board-dirs := $(sort $(notdir $(board-dirs:/=))) 1583 1584PHONY += help 1585help: 1586 @echo 'Cleaning targets:' 1587 @echo ' clean - Remove most generated files but keep the config and' 1588 @echo ' enough build support to build external modules' 1589 @echo ' mrproper - Remove all generated files + config + various backup files' 1590 @echo ' distclean - mrproper + remove editor backup and patch files' 1591 @echo '' 1592 @echo 'Configuration targets:' 1593 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1594 @echo '' 1595 @echo 'Other generic targets:' 1596 @echo ' all - Build all targets marked with [*]' 1597 @echo '* vmlinux - Build the bare kernel' 1598 @echo '* modules - Build all modules' 1599 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1600 @echo ' dir/ - Build all files in dir and below' 1601 @echo ' dir/file.[ois] - Build specified target only' 1602 @echo ' dir/file.ll - Build the LLVM assembly file' 1603 @echo ' (requires compiler support for LLVM assembly generation)' 1604 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1605 @echo ' (requires a recent binutils and recent build (System.map))' 1606 @echo ' dir/file.ko - Build module including final link' 1607 @echo ' modules_prepare - Set up for building external modules' 1608 @echo ' tags/TAGS - Generate tags file for editors' 1609 @echo ' cscope - Generate cscope index' 1610 @echo ' gtags - Generate GNU GLOBAL index' 1611 @echo ' kernelrelease - Output the release version string (use with make -s)' 1612 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1613 @echo ' image_name - Output the image name (use with make -s)' 1614 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1615 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1616 echo '' 1617 @echo 'Static analysers:' 1618 @echo ' checkstack - Generate a list of stack hogs' 1619 @echo ' versioncheck - Sanity check on version.h usage' 1620 @echo ' includecheck - Check for duplicate included header files' 1621 @echo ' export_report - List the usages of all exported symbols' 1622 @echo ' headerdep - Detect inclusion cycles in headers' 1623 @echo ' coccicheck - Check with Coccinelle' 1624 @echo ' clang-analyzer - Check with clang static analyzer' 1625 @echo ' clang-tidy - Check with clang-tidy' 1626 @echo '' 1627 @echo 'Tools:' 1628 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1629 @echo '' 1630 @echo 'Kernel selftest:' 1631 @echo ' kselftest - Build and run kernel selftest' 1632 @echo ' Build, install, and boot kernel before' 1633 @echo ' running kselftest on it' 1634 @echo ' Run as root for full coverage' 1635 @echo ' kselftest-all - Build kernel selftest' 1636 @echo ' kselftest-install - Build and install kernel selftest' 1637 @echo ' kselftest-clean - Remove all generated kselftest files' 1638 @echo ' kselftest-merge - Merge all the config dependencies of' 1639 @echo ' kselftest to existing .config.' 1640 @echo '' 1641 @$(if $(dtstree), \ 1642 echo 'Devicetree:'; \ 1643 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1644 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1645 echo ' dt_binding_check - Validate device tree binding documents'; \ 1646 echo ' dtbs_check - Validate device tree source files';\ 1647 echo '') 1648 1649 @echo 'Userspace tools targets:' 1650 @echo ' use "make tools/help"' 1651 @echo ' or "cd tools; make help"' 1652 @echo '' 1653 @echo 'Kernel packaging:' 1654 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1655 @echo '' 1656 @echo 'Documentation targets:' 1657 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1658 @echo '' 1659 @echo 'Architecture specific targets ($(SRCARCH)):' 1660 @$(if $(archhelp),$(archhelp),\ 1661 echo ' No architecture specific help defined for $(SRCARCH)') 1662 @echo '' 1663 @$(if $(boards), \ 1664 $(foreach b, $(boards), \ 1665 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1666 echo '') 1667 @$(if $(board-dirs), \ 1668 $(foreach b, $(board-dirs), \ 1669 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1670 printf " %-16s - Show all of the above\\n" help-boards; \ 1671 echo '') 1672 1673 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1674 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1675 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1676 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1677 @echo ' (sparse by default)' 1678 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1679 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1680 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1681 @echo ' 1: warnings which may be relevant and do not occur too often' 1682 @echo ' 2: warnings which occur quite often but may still be relevant' 1683 @echo ' 3: more obscure warnings, can most likely be ignored' 1684 @echo ' Multiple levels can be combined with W=12 or W=123' 1685 @echo '' 1686 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1687 @echo 'For further info see the ./README file' 1688 1689 1690help-board-dirs := $(addprefix help-,$(board-dirs)) 1691 1692help-boards: $(help-board-dirs) 1693 1694boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1695 1696$(help-board-dirs): help-%: 1697 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1698 @$(if $(boards-per-dir), \ 1699 $(foreach b, $(boards-per-dir), \ 1700 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1701 echo '') 1702 1703 1704# Documentation targets 1705# --------------------------------------------------------------------------- 1706DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1707 linkcheckdocs dochelp refcheckdocs 1708PHONY += $(DOC_TARGETS) 1709$(DOC_TARGETS): 1710 $(Q)$(MAKE) $(build)=Documentation $@ 1711 1712# Misc 1713# --------------------------------------------------------------------------- 1714 1715PHONY += scripts_gdb 1716scripts_gdb: prepare0 1717 $(Q)$(MAKE) $(build)=scripts/gdb 1718 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1719 1720ifdef CONFIG_GDB_SCRIPTS 1721all: scripts_gdb 1722endif 1723 1724else # KBUILD_EXTMOD 1725 1726### 1727# External module support. 1728# When building external modules the kernel used as basis is considered 1729# read-only, and no consistency checks are made and the make 1730# system is not used on the basis kernel. If updates are required 1731# in the basis kernel ordinary make commands (without M=...) must 1732# be used. 1733# 1734# The following are the only valid targets when building external 1735# modules. 1736# make M=dir clean Delete all automatically generated files 1737# make M=dir modules Make all modules in specified dir 1738# make M=dir Same as 'make M=dir modules' 1739# make M=dir modules_install 1740# Install the modules built in the module directory 1741# Assumes install directory is already created 1742 1743# We are always building only modules. 1744KBUILD_BUILTIN := 1745KBUILD_MODULES := 1 1746 1747build-dirs := $(KBUILD_EXTMOD) 1748$(MODORDER): descend 1749 @: 1750 1751compile_commands.json: $(extmod-prefix)compile_commands.json 1752PHONY += compile_commands.json 1753 1754clean-dirs := $(KBUILD_EXTMOD) 1755clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1756 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1757 1758PHONY += help 1759help: 1760 @echo ' Building external modules.' 1761 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1762 @echo '' 1763 @echo ' modules - default target, build the module(s)' 1764 @echo ' modules_install - install the module' 1765 @echo ' clean - remove generated files in module directory only' 1766 @echo '' 1767 1768# no-op for external module builds 1769PHONY += prepare modules_prepare 1770 1771endif # KBUILD_EXTMOD 1772 1773# --------------------------------------------------------------------------- 1774# Modules 1775 1776PHONY += modules modules_install 1777 1778ifdef CONFIG_MODULES 1779 1780modules: $(MODORDER) 1781 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1782 1783quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1784 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1785 $(KERNELRELEASE) 1786 1787modules_install: 1788 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1789 $(call cmd,depmod) 1790 1791else # CONFIG_MODULES 1792 1793# Modules not configured 1794# --------------------------------------------------------------------------- 1795 1796modules modules_install: 1797 @echo >&2 '***' 1798 @echo >&2 '*** The present kernel configuration has modules disabled.' 1799 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.' 1800 @echo >&2 '*** to enable CONFIG_MODULES.' 1801 @echo >&2 '***' 1802 @exit 1 1803 1804KBUILD_MODULES := 1805 1806endif # CONFIG_MODULES 1807 1808# Single targets 1809# --------------------------------------------------------------------------- 1810# To build individual files in subdirectories, you can do like this: 1811# 1812# make foo/bar/baz.s 1813# 1814# The supported suffixes for single-target are listed in 'single-targets' 1815# 1816# To build only under specific subdirectories, you can do like this: 1817# 1818# make foo/bar/baz/ 1819 1820ifdef single-build 1821 1822# .ko is special because modpost is needed 1823single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1824single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1825 1826$(single-ko): single_modpost 1827 @: 1828$(single-no-ko): descend 1829 @: 1830 1831# Remove MODORDER when done because it is not the real one. 1832PHONY += single_modpost 1833single_modpost: $(single-no-ko) modules_prepare 1834 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER) 1835 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1836 $(Q)rm -f $(MODORDER) 1837 1838export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko)) 1839 1840# trim unrelated directories 1841build-dirs := $(foreach d, $(build-dirs), \ 1842 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1843 1844endif 1845 1846# Handle descending into subdirectories listed in $(build-dirs) 1847# Preset locale variables to speed up the build process. Limit locale 1848# tweaks to this spot to avoid wrong language settings when running 1849# make menuconfig etc. 1850# Error messages still appears in the original language 1851PHONY += descend $(build-dirs) 1852descend: $(build-dirs) 1853$(build-dirs): prepare 1854 $(Q)$(MAKE) $(build)=$@ \ 1855 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ 1856 need-builtin=1 need-modorder=1 1857 1858clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1859PHONY += $(clean-dirs) clean 1860$(clean-dirs): 1861 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1862 1863clean: $(clean-dirs) 1864 $(call cmd,rmfiles) 1865 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1866 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1867 -o -name '*.ko.*' \ 1868 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1869 -o -name '*.dwo' -o -name '*.lst' \ 1870 -o -name '*.su' -o -name '*.mod' \ 1871 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1872 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1873 -o -name '*.asn1.[ch]' \ 1874 -o -name '*.symtypes' -o -name 'modules.order' \ 1875 -o -name '.tmp_*.o.*' \ 1876 -o -name '*.c.[012]*.*' \ 1877 -o -name '*.ll' \ 1878 -o -name '*.gcno' \ 1879 -o -name '*.*.symversions' \) -type f -print | xargs rm -f 1880 1881# Generate tags for editors 1882# --------------------------------------------------------------------------- 1883quiet_cmd_tags = GEN $@ 1884 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1885 1886tags TAGS cscope gtags: FORCE 1887 $(call cmd,tags) 1888 1889# Script to generate missing namespace dependencies 1890# --------------------------------------------------------------------------- 1891 1892PHONY += nsdeps 1893nsdeps: export KBUILD_NSDEPS=1 1894nsdeps: modules 1895 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1896 1897# Clang Tooling 1898# --------------------------------------------------------------------------- 1899 1900quiet_cmd_gen_compile_commands = GEN $@ 1901 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1902 1903$(extmod-prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1904 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \ 1905 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1906 $(call if_changed,gen_compile_commands) 1907 1908targets += $(extmod-prefix)compile_commands.json 1909 1910PHONY += clang-tidy clang-analyzer 1911 1912ifdef CONFIG_CC_IS_CLANG 1913quiet_cmd_clang_tools = CHECK $< 1914 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1915 1916clang-tidy clang-analyzer: $(extmod-prefix)compile_commands.json 1917 $(call cmd,clang_tools) 1918else 1919clang-tidy clang-analyzer: 1920 @echo "$@ requires CC=clang" >&2 1921 @false 1922endif 1923 1924# Scripts to check various things for consistency 1925# --------------------------------------------------------------------------- 1926 1927PHONY += includecheck versioncheck coccicheck export_report 1928 1929includecheck: 1930 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1931 -name '*.[hcS]' -type f -print | sort \ 1932 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1933 1934versioncheck: 1935 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1936 -name '*.[hcS]' -type f -print | sort \ 1937 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1938 1939coccicheck: 1940 $(Q)$(BASH) $(srctree)/scripts/$@ 1941 1942export_report: 1943 $(PERL) $(srctree)/scripts/export_report.pl 1944 1945PHONY += checkstack kernelrelease kernelversion image_name 1946 1947# UML needs a little special treatment here. It wants to use the host 1948# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1949# else wants $(ARCH), including people doing cross-builds, which means 1950# that $(SUBARCH) doesn't work here. 1951ifeq ($(ARCH), um) 1952CHECKSTACK_ARCH := $(SUBARCH) 1953else 1954CHECKSTACK_ARCH := $(ARCH) 1955endif 1956checkstack: 1957 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1958 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1959 1960kernelrelease: 1961 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1962 1963kernelversion: 1964 @echo $(KERNELVERSION) 1965 1966image_name: 1967 @echo $(KBUILD_IMAGE) 1968 1969# Clear a bunch of variables before executing the submake 1970 1971ifeq ($(quiet),silent_) 1972tools_silent=s 1973endif 1974 1975tools/: FORCE 1976 $(Q)mkdir -p $(objtree)/tools 1977 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1978 1979tools/%: FORCE 1980 $(Q)mkdir -p $(objtree)/tools 1981 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1982 1983quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1984 cmd_rmfiles = rm -rf $(rm-files) 1985 1986# read saved command lines for existing targets 1987existing-targets := $(wildcard $(sort $(targets))) 1988 1989-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1990 1991endif # config-build 1992endif # mixed-build 1993endif # need-sub-make 1994 1995PHONY += FORCE 1996FORCE: 1997 1998# Declare the contents of the PHONY variable as phony. We keep that 1999# information in a variable so we can use it in if_changed and friends. 2000.PHONY: $(PHONY) 2001