1# SPDX-License-Identifier: GPL-2.0 2VERSION = 6 3PATCHLEVEL = 10 4SUBLEVEL = 0 5EXTRAVERSION = -rc7 6NAME = Baby Opossum Posse 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 14ifeq ($(filter output-sync,$(.FEATURES)),) 15$(error GNU Make >= 4.0 is required. Your Make version is $(MAKE_VERSION)) 16endif 17 18$(if $(filter __%, $(MAKECMDGOALS)), \ 19 $(error targets prefixed with '__' are only for internal use)) 20 21# That's our default target when none is given on the command line 22PHONY := __all 23__all: 24 25# We are using a recursive build, so we need to do a little thinking 26# to get the ordering right. 27# 28# Most importantly: sub-Makefiles should only ever modify files in 29# their own directory. If in some directory we have a dependency on 30# a file in another dir (which doesn't happen often, but it's often 31# unavoidable when linking the built-in.a targets which finally 32# turn into vmlinux), we will call a sub make in that other dir, and 33# after that we are sure that everything which is in that other dir 34# is now up to date. 35# 36# The only cases where we need to modify files which have global 37# effects are thus separated out and done before the recursive 38# descending is started. They are now explicitly listed as the 39# prepare rule. 40 41this-makefile := $(lastword $(MAKEFILE_LIST)) 42abs_srctree := $(realpath $(dir $(this-makefile))) 43abs_objtree := $(CURDIR) 44 45ifneq ($(sub_make_done),1) 46 47# Do not use make's built-in rules and variables 48# (this increases performance and avoids hard-to-debug behaviour) 49MAKEFLAGS += -rR 50 51# Avoid funny character set dependencies 52unexport LC_ALL 53LC_COLLATE=C 54LC_NUMERIC=C 55export LC_COLLATE LC_NUMERIC 56 57# Avoid interference with shell env settings 58unexport GREP_OPTIONS 59 60# Beautify output 61# --------------------------------------------------------------------------- 62# 63# Most of build commands in Kbuild start with "cmd_". You can optionally define 64# "quiet_cmd_*". If defined, the short log is printed. Otherwise, no log from 65# that command is printed by default. 66# 67# e.g.) 68# quiet_cmd_depmod = DEPMOD $(MODLIB) 69# cmd_depmod = $(srctree)/scripts/depmod.sh $(DEPMOD) $(KERNELRELEASE) 70# 71# A simple variant is to prefix commands with $(Q) - that's useful 72# for commands that shall be hidden in non-verbose mode. 73# 74# $(Q)$(MAKE) $(build)=scripts/basic 75# 76# If KBUILD_VERBOSE contains 1, the whole command is echoed. 77# If KBUILD_VERBOSE contains 2, the reason for rebuilding is printed. 78# 79# To put more focus on warnings, be less verbose as default 80# Use 'make V=1' to see the full commands 81 82ifeq ("$(origin V)", "command line") 83 KBUILD_VERBOSE = $(V) 84endif 85 86quiet = quiet_ 87Q = @ 88 89ifneq ($(findstring 1, $(KBUILD_VERBOSE)),) 90 quiet = 91 Q = 92endif 93 94# If the user is running make -s (silent mode), suppress echoing of 95# commands 96ifneq ($(findstring s,$(firstword -$(MAKEFLAGS))),) 97quiet=silent_ 98override KBUILD_VERBOSE := 99endif 100 101export quiet Q KBUILD_VERBOSE 102 103# Call a source code checker (by default, "sparse") as part of the 104# C compilation. 105# 106# Use 'make C=1' to enable checking of only re-compiled files. 107# Use 'make C=2' to enable checking of *all* source files, regardless 108# of whether they are re-compiled or not. 109# 110# See the file "Documentation/dev-tools/sparse.rst" for more details, 111# including where to get the "sparse" utility. 112 113ifeq ("$(origin C)", "command line") 114 KBUILD_CHECKSRC = $(C) 115endif 116ifndef KBUILD_CHECKSRC 117 KBUILD_CHECKSRC = 0 118endif 119 120export KBUILD_CHECKSRC 121 122# Enable "clippy" (a linter) as part of the Rust compilation. 123# 124# Use 'make CLIPPY=1' to enable it. 125ifeq ("$(origin CLIPPY)", "command line") 126 KBUILD_CLIPPY := $(CLIPPY) 127endif 128 129export KBUILD_CLIPPY 130 131# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 132# directory of external module to build. Setting M= takes precedence. 133ifeq ("$(origin M)", "command line") 134 KBUILD_EXTMOD := $(M) 135endif 136 137$(if $(word 2, $(KBUILD_EXTMOD)), \ 138 $(error building multiple external modules is not supported)) 139 140$(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \ 141 $(error module directory path cannot contain '$x'))) 142 143# Remove trailing slashes 144ifneq ($(filter %/, $(KBUILD_EXTMOD)),) 145KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) 146endif 147 148export KBUILD_EXTMOD 149 150# backward compatibility 151KBUILD_EXTRA_WARN ?= $(KBUILD_ENABLE_EXTRA_GCC_CHECKS) 152 153ifeq ("$(origin W)", "command line") 154 KBUILD_EXTRA_WARN := $(W) 155endif 156 157export KBUILD_EXTRA_WARN 158 159# Kbuild will save output files in the current working directory. 160# This does not need to match to the root of the kernel source tree. 161# 162# For example, you can do this: 163# 164# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 165# 166# If you want to save output files in a different location, there are 167# two syntaxes to specify it. 168# 169# 1) O= 170# Use "make O=dir/to/store/output/files/" 171# 172# 2) Set KBUILD_OUTPUT 173# Set the environment variable KBUILD_OUTPUT to point to the output directory. 174# export KBUILD_OUTPUT=dir/to/store/output/files/; make 175# 176# The O= assignment takes precedence over the KBUILD_OUTPUT environment 177# variable. 178 179# Do we want to change the working directory? 180ifeq ("$(origin O)", "command line") 181 KBUILD_OUTPUT := $(O) 182endif 183 184ifneq ($(KBUILD_OUTPUT),) 185# $(realpath ...) gets empty if the path does not exist. Run 'mkdir -p' first. 186$(shell mkdir -p "$(KBUILD_OUTPUT)") 187# $(realpath ...) resolves symlinks 188abs_objtree := $(realpath $(KBUILD_OUTPUT)) 189$(if $(abs_objtree),,$(error failed to create output directory "$(KBUILD_OUTPUT)")) 190endif # ifneq ($(KBUILD_OUTPUT),) 191 192ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 193$(error source directory cannot contain spaces or colons) 194endif 195 196export sub_make_done := 1 197 198endif # sub_make_done 199 200ifeq ($(abs_objtree),$(CURDIR)) 201# Suppress "Entering directory ..." if we are at the final work directory. 202no-print-directory := --no-print-directory 203else 204# Recursion to show "Entering directory ..." 205need-sub-make := 1 206endif 207 208ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),) 209# If --no-print-directory is unset, recurse once again to set it. 210# You may end up recursing into __sub-make twice. This is needed due to the 211# behavior change in GNU Make 4.4.1. 212need-sub-make := 1 213endif 214 215ifeq ($(need-sub-make),1) 216 217PHONY += $(MAKECMDGOALS) __sub-make 218 219$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 220 @: 221 222# Invoke a second make in the output directory, passing relevant variables 223__sub-make: 224 $(Q)$(MAKE) $(no-print-directory) -C $(abs_objtree) \ 225 -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 226 227else # need-sub-make 228 229# We process the rest of the Makefile if this is the final invocation of make 230 231ifeq ($(abs_srctree),$(abs_objtree)) 232 # building in the source tree 233 srctree := . 234 building_out_of_srctree := 235else 236 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 237 # building in a subdirectory of the source tree 238 srctree := .. 239 else 240 srctree := $(abs_srctree) 241 endif 242 building_out_of_srctree := 1 243endif 244 245ifneq ($(KBUILD_ABS_SRCTREE),) 246srctree := $(abs_srctree) 247endif 248 249objtree := . 250 251VPATH := 252 253ifeq ($(KBUILD_EXTMOD),) 254ifdef building_out_of_srctree 255VPATH := $(srctree) 256endif 257endif 258 259export building_out_of_srctree srctree objtree VPATH 260 261# To make sure we do not include .config for any of the *config targets 262# catch them early, and hand them over to scripts/kconfig/Makefile 263# It is allowed to specify more targets when calling make, including 264# mixing *config targets and build targets. 265# For example 'make oldconfig all'. 266# Detect when mixed targets is specified, and make a second invocation 267# of make so .config is not included in this case either (for *config). 268 269version_h := include/generated/uapi/linux/version.h 270 271clean-targets := %clean mrproper cleandocs 272no-dot-config-targets := $(clean-targets) \ 273 cscope gtags TAGS tags help% %docs check% coccicheck \ 274 $(version_h) headers headers_% archheaders archscripts \ 275 %asm-generic kernelversion %src-pkg dt_binding_check \ 276 outputmakefile rustavailable rustfmt rustfmtcheck 277no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \ 278 image_name 279single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/ 280 281config-build := 282mixed-build := 283need-config := 1 284may-sync-config := 1 285single-build := 286 287ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 288 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 289 need-config := 290 endif 291endif 292 293ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 294 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 295 may-sync-config := 296 endif 297endif 298 299need-compiler := $(may-sync-config) 300 301ifneq ($(KBUILD_EXTMOD),) 302 may-sync-config := 303endif 304 305ifeq ($(KBUILD_EXTMOD),) 306 ifneq ($(filter %config,$(MAKECMDGOALS)),) 307 config-build := 1 308 ifneq ($(words $(MAKECMDGOALS)),1) 309 mixed-build := 1 310 endif 311 endif 312endif 313 314# We cannot build single targets and the others at the same time 315ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 316 single-build := 1 317 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 318 mixed-build := 1 319 endif 320endif 321 322# For "make -j clean all", "make -j mrproper defconfig all", etc. 323ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 324 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 325 mixed-build := 1 326 endif 327endif 328 329# install and modules_install need also be processed one by one 330ifneq ($(filter install,$(MAKECMDGOALS)),) 331 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 332 mixed-build := 1 333 endif 334endif 335 336ifdef mixed-build 337# =========================================================================== 338# We're called with mixed targets (*config and build targets). 339# Handle them one by one. 340 341PHONY += $(MAKECMDGOALS) __build_one_by_one 342 343$(MAKECMDGOALS): __build_one_by_one 344 @: 345 346__build_one_by_one: 347 $(Q)set -e; \ 348 for i in $(MAKECMDGOALS); do \ 349 $(MAKE) -f $(srctree)/Makefile $$i; \ 350 done 351 352else # !mixed-build 353 354include $(srctree)/scripts/Kbuild.include 355 356# Read KERNELRELEASE from include/config/kernel.release (if it exists) 357KERNELRELEASE = $(call read-file, include/config/kernel.release) 358KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 359export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 360 361include $(srctree)/scripts/subarch.include 362 363# Cross compiling and selecting different set of gcc/bin-utils 364# --------------------------------------------------------------------------- 365# 366# When performing cross compilation for other architectures ARCH shall be set 367# to the target architecture. (See arch/* for the possibilities). 368# ARCH can be set during invocation of make: 369# make ARCH=arm64 370# Another way is to have ARCH set in the environment. 371# The default ARCH is the host where make is executed. 372 373# CROSS_COMPILE specify the prefix used for all executables used 374# during compilation. Only gcc and related bin-utils executables 375# are prefixed with $(CROSS_COMPILE). 376# CROSS_COMPILE can be set on the command line 377# make CROSS_COMPILE=aarch64-linux-gnu- 378# Alternatively CROSS_COMPILE can be set in the environment. 379# Default value for CROSS_COMPILE is not to prefix executables 380# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 381ARCH ?= $(SUBARCH) 382 383# Architecture as present in compile.h 384UTS_MACHINE := $(ARCH) 385SRCARCH := $(ARCH) 386 387# Additional ARCH settings for x86 388ifeq ($(ARCH),i386) 389 SRCARCH := x86 390endif 391ifeq ($(ARCH),x86_64) 392 SRCARCH := x86 393endif 394 395# Additional ARCH settings for sparc 396ifeq ($(ARCH),sparc32) 397 SRCARCH := sparc 398endif 399ifeq ($(ARCH),sparc64) 400 SRCARCH := sparc 401endif 402 403# Additional ARCH settings for parisc 404ifeq ($(ARCH),parisc64) 405 SRCARCH := parisc 406endif 407 408export cross_compiling := 409ifneq ($(SRCARCH),$(SUBARCH)) 410cross_compiling := 1 411endif 412 413KCONFIG_CONFIG ?= .config 414export KCONFIG_CONFIG 415 416# SHELL used by kbuild 417CONFIG_SHELL := sh 418 419HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 420HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 421HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 422 423ifneq ($(LLVM),) 424ifneq ($(filter %/,$(LLVM)),) 425LLVM_PREFIX := $(LLVM) 426else ifneq ($(filter -%,$(LLVM)),) 427LLVM_SUFFIX := $(LLVM) 428endif 429 430HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 431HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 432else 433HOSTCC = gcc 434HOSTCXX = g++ 435endif 436HOSTRUSTC = rustc 437HOSTPKG_CONFIG = pkg-config 438 439KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 440 -O2 -fomit-frame-pointer -std=gnu11 441KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 442KBUILD_USERLDFLAGS := $(USERLDFLAGS) 443 444# These flags apply to all Rust code in the tree, including the kernel and 445# host programs. 446export rust_common_flags := --edition=2021 \ 447 -Zbinary_dep_depinfo=y \ 448 -Dunsafe_op_in_unsafe_fn -Drust_2018_idioms \ 449 -Dunreachable_pub -Dnon_ascii_idents \ 450 -Wmissing_docs \ 451 -Drustdoc::missing_crate_level_docs \ 452 -Dclippy::correctness -Dclippy::style \ 453 -Dclippy::suspicious -Dclippy::complexity \ 454 -Dclippy::perf \ 455 -Dclippy::let_unit_value -Dclippy::mut_mut \ 456 -Dclippy::needless_bitwise_bool \ 457 -Dclippy::needless_continue \ 458 -Dclippy::no_mangle_with_rust_abi \ 459 -Wclippy::dbg_macro 460 461KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 462KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 463KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 464 -Zallow-features= $(HOSTRUSTFLAGS) 465KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 466KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 467 468# Make variables (CC, etc...) 469CPP = $(CC) -E 470ifneq ($(LLVM),) 471CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 472LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 473AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 474NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 475OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 476OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 477READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 478STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 479else 480CC = $(CROSS_COMPILE)gcc 481LD = $(CROSS_COMPILE)ld 482AR = $(CROSS_COMPILE)ar 483NM = $(CROSS_COMPILE)nm 484OBJCOPY = $(CROSS_COMPILE)objcopy 485OBJDUMP = $(CROSS_COMPILE)objdump 486READELF = $(CROSS_COMPILE)readelf 487STRIP = $(CROSS_COMPILE)strip 488endif 489RUSTC = rustc 490RUSTDOC = rustdoc 491RUSTFMT = rustfmt 492CLIPPY_DRIVER = clippy-driver 493BINDGEN = bindgen 494CARGO = cargo 495PAHOLE = pahole 496RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 497LEX = flex 498YACC = bison 499AWK = awk 500INSTALLKERNEL := installkernel 501PERL = perl 502PYTHON3 = python3 503CHECK = sparse 504BASH = bash 505KGZIP = gzip 506KBZIP2 = bzip2 507KLZOP = lzop 508LZMA = lzma 509LZ4 = lz4c 510XZ = xz 511ZSTD = zstd 512 513CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 514 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 515NOSTDINC_FLAGS := 516CFLAGS_MODULE = 517RUSTFLAGS_MODULE = 518AFLAGS_MODULE = 519LDFLAGS_MODULE = 520CFLAGS_KERNEL = 521RUSTFLAGS_KERNEL = 522AFLAGS_KERNEL = 523LDFLAGS_vmlinux = 524 525# Use USERINCLUDE when you must reference the UAPI directories only. 526USERINCLUDE := \ 527 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 528 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 529 -I$(srctree)/include/uapi \ 530 -I$(objtree)/include/generated/uapi \ 531 -include $(srctree)/include/linux/compiler-version.h \ 532 -include $(srctree)/include/linux/kconfig.h 533 534# Use LINUXINCLUDE when you must reference the include/ directory. 535# Needed to be compatible with the O= option 536LINUXINCLUDE := \ 537 -I$(srctree)/arch/$(SRCARCH)/include \ 538 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 539 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 540 -I$(objtree)/include \ 541 $(USERINCLUDE) 542 543KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 544 545KBUILD_CFLAGS := 546KBUILD_CFLAGS += -std=gnu11 547KBUILD_CFLAGS += -fshort-wchar 548KBUILD_CFLAGS += -funsigned-char 549KBUILD_CFLAGS += -fno-common 550KBUILD_CFLAGS += -fno-PIE 551KBUILD_CFLAGS += -fno-strict-aliasing 552 553KBUILD_CPPFLAGS := -D__KERNEL__ 554KBUILD_RUSTFLAGS := $(rust_common_flags) \ 555 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 556 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 557 -Csymbol-mangling-version=v0 \ 558 -Crelocation-model=static \ 559 -Zfunction-sections=n \ 560 -Dclippy::float_arithmetic 561 562KBUILD_AFLAGS_KERNEL := 563KBUILD_CFLAGS_KERNEL := 564KBUILD_RUSTFLAGS_KERNEL := 565KBUILD_AFLAGS_MODULE := -DMODULE 566KBUILD_CFLAGS_MODULE := -DMODULE 567KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 568KBUILD_LDFLAGS_MODULE := 569KBUILD_LDFLAGS := 570CLANG_FLAGS := 571 572ifeq ($(KBUILD_CLIPPY),1) 573 RUSTC_OR_CLIPPY_QUIET := CLIPPY 574 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 575else 576 RUSTC_OR_CLIPPY_QUIET := RUSTC 577 RUSTC_OR_CLIPPY = $(RUSTC) 578endif 579 580ifdef RUST_LIB_SRC 581 export RUST_LIB_SRC 582endif 583 584# Allows the usage of unstable features in stable compilers. 585export RUSTC_BOOTSTRAP := 1 586 587export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 588export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO 589export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 590export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 591export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 592export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 593export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 594export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 595 596export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 597export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 598export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 599export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 600export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 601export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 602 603# Files to ignore in find ... statements 604 605export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 606 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 607 -prune -o 608 609# =========================================================================== 610# Rules shared between *config targets and build targets 611 612# Basic helpers built in scripts/basic/ 613PHONY += scripts_basic 614scripts_basic: 615 $(Q)$(MAKE) $(build)=scripts/basic 616 617PHONY += outputmakefile 618ifdef building_out_of_srctree 619# Before starting out-of-tree build, make sure the source tree is clean. 620# outputmakefile generates a Makefile in the output directory, if using a 621# separate output directory. This allows convenient use of make in the 622# output directory. 623# At the same time when output Makefile generated, generate .gitignore to 624# ignore whole output directory 625 626quiet_cmd_makefile = GEN Makefile 627 cmd_makefile = { \ 628 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 629 echo "include $(srctree)/Makefile"; \ 630 } > Makefile 631 632outputmakefile: 633 @if [ -f $(srctree)/.config -o \ 634 -d $(srctree)/include/config -o \ 635 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 636 echo >&2 "***"; \ 637 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 638 echo >&2 "*** in $(abs_srctree)";\ 639 echo >&2 "***"; \ 640 false; \ 641 fi 642 $(Q)ln -fsn $(srctree) source 643 $(call cmd,makefile) 644 $(Q)test -e .gitignore || \ 645 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 646endif 647 648# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 649# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 650# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 651# and from include/config/auto.conf.cmd to detect the compiler upgrade. 652CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 653 654ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 655include $(srctree)/scripts/Makefile.clang 656endif 657 658# Include this also for config targets because some architectures need 659# cc-cross-prefix to determine CROSS_COMPILE. 660ifdef need-compiler 661include $(srctree)/scripts/Makefile.compiler 662endif 663 664ifdef config-build 665# =========================================================================== 666# *config targets only - make sure prerequisites are updated, and descend 667# in scripts/kconfig to make the *config target 668 669# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 670# KBUILD_DEFCONFIG may point out an alternative default configuration 671# used for 'make defconfig' 672include $(srctree)/arch/$(SRCARCH)/Makefile 673export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 674 675config: outputmakefile scripts_basic FORCE 676 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 677 678%config: outputmakefile scripts_basic FORCE 679 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 680 681else #!config-build 682# =========================================================================== 683# Build targets only - this includes vmlinux, arch-specific targets, clean 684# targets and others. In general all targets except *config targets. 685 686# If building an external module we do not care about the all: rule 687# but instead __all depend on modules 688PHONY += all 689ifeq ($(KBUILD_EXTMOD),) 690__all: all 691else 692__all: modules 693endif 694 695targets := 696 697# Decide whether to build built-in, modular, or both. 698# Normally, just do built-in. 699 700KBUILD_MODULES := 701KBUILD_BUILTIN := 1 702 703# If we have only "make modules", don't compile built-in objects. 704ifeq ($(MAKECMDGOALS),modules) 705 KBUILD_BUILTIN := 706endif 707 708# If we have "make <whatever> modules", compile modules 709# in addition to whatever we do anyway. 710# Just "make" or "make all" shall build modules as well 711 712ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 713 KBUILD_MODULES := 1 714endif 715 716ifeq ($(MAKECMDGOALS),) 717 KBUILD_MODULES := 1 718endif 719 720export KBUILD_MODULES KBUILD_BUILTIN 721 722ifdef need-config 723include include/config/auto.conf 724endif 725 726ifeq ($(KBUILD_EXTMOD),) 727# Objects we will link into vmlinux / subdirs we need to visit 728core-y := 729drivers-y := 730libs-y := lib/ 731endif # KBUILD_EXTMOD 732 733# The all: target is the default when no target is given on the 734# command line. 735# This allow a user to issue only 'make' to build a kernel including modules 736# Defaults to vmlinux, but the arch makefile usually adds further targets 737all: vmlinux 738 739CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 740ifdef CONFIG_CC_IS_GCC 741CFLAGS_GCOV += -fno-tree-loop-im 742endif 743export CFLAGS_GCOV 744 745# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 746ifdef CONFIG_FUNCTION_TRACER 747 CC_FLAGS_FTRACE := -pg 748endif 749 750include $(srctree)/arch/$(SRCARCH)/Makefile 751 752ifdef need-config 753ifdef may-sync-config 754# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 755# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 756# because some architectures define CROSS_COMPILE there. 757include include/config/auto.conf.cmd 758 759$(KCONFIG_CONFIG): 760 @echo >&2 '***' 761 @echo >&2 '*** Configuration file "$@" not found!' 762 @echo >&2 '***' 763 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 764 @echo >&2 '*** "make menuconfig" or "make xconfig").' 765 @echo >&2 '***' 766 @/bin/false 767 768# The actual configuration files used during the build are stored in 769# include/generated/ and include/config/. Update them if .config is newer than 770# include/config/auto.conf (which mirrors .config). 771# 772# This exploits the 'multi-target pattern rule' trick. 773# The syncconfig should be executed only once to make all the targets. 774# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 775# 776# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 777# so you cannot notice that Kconfig is waiting for the user input. 778%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 779 $(Q)$(kecho) " SYNC $@" 780 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 781else # !may-sync-config 782# External modules and some install targets need include/generated/autoconf.h 783# and include/config/auto.conf but do not care if they are up-to-date. 784# Use auto.conf to trigger the test 785PHONY += include/config/auto.conf 786 787include/config/auto.conf: 788 @test -e include/generated/autoconf.h -a -e $@ || ( \ 789 echo >&2; \ 790 echo >&2 " ERROR: Kernel configuration is invalid."; \ 791 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 792 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 793 echo >&2 ; \ 794 /bin/false) 795 796endif # may-sync-config 797endif # need-config 798 799KBUILD_CFLAGS += -fno-delete-null-pointer-checks 800 801ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 802KBUILD_CFLAGS += -O2 803KBUILD_RUSTFLAGS += -Copt-level=2 804else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 805KBUILD_CFLAGS += -Os 806KBUILD_RUSTFLAGS += -Copt-level=s 807endif 808 809# Always set `debug-assertions` and `overflow-checks` because their default 810# depends on `opt-level` and `debug-assertions`, respectively. 811KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 812KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 813 814# Tell gcc to never replace conditional load with a non-conditional one 815ifdef CONFIG_CC_IS_GCC 816# gcc-10 renamed --param=allow-store-data-races=0 to 817# -fno-allow-store-data-races. 818KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 819KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 820endif 821 822ifdef CONFIG_READABLE_ASM 823# Disable optimizations that make assembler listings hard to read. 824# reorder blocks reorders the control in the function 825# ipa clone creates specialized cloned functions 826# partial inlining inlines only parts of functions 827KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 828endif 829 830stackp-flags-y := -fno-stack-protector 831stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 832stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 833 834KBUILD_CFLAGS += $(stackp-flags-y) 835 836KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings 837KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) 838 839ifdef CONFIG_FRAME_POINTER 840KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 841KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 842else 843# Some targets (ARM with Thumb2, for example), can't be built with frame 844# pointers. For those, we don't have FUNCTION_TRACER automatically 845# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 846# incompatible with -fomit-frame-pointer with current GCC, so we don't use 847# -fomit-frame-pointer with FUNCTION_TRACER. 848# In the Rust target specification, "frame-pointer" is set explicitly 849# to "may-omit". 850ifndef CONFIG_FUNCTION_TRACER 851KBUILD_CFLAGS += -fomit-frame-pointer 852endif 853endif 854 855# Initialize all stack variables with a 0xAA pattern. 856ifdef CONFIG_INIT_STACK_ALL_PATTERN 857KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 858endif 859 860# Initialize all stack variables with a zero value. 861ifdef CONFIG_INIT_STACK_ALL_ZERO 862KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 863ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 864# https://github.com/llvm/llvm-project/issues/44842 865CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 866export CC_AUTO_VAR_INIT_ZERO_ENABLER 867KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 868endif 869endif 870 871# While VLAs have been removed, GCC produces unreachable stack probes 872# for the randomize_kstack_offset feature. Disable it for all compilers. 873KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 874 875# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 876ifdef CONFIG_ZERO_CALL_USED_REGS 877KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 878endif 879 880ifdef CONFIG_FUNCTION_TRACER 881ifdef CONFIG_FTRACE_MCOUNT_USE_CC 882 CC_FLAGS_FTRACE += -mrecord-mcount 883 ifdef CONFIG_HAVE_NOP_MCOUNT 884 ifeq ($(call cc-option-yn, -mnop-mcount),y) 885 CC_FLAGS_FTRACE += -mnop-mcount 886 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 887 endif 888 endif 889endif 890ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 891 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 892 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 893 endif 894endif 895ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 896 ifdef CONFIG_HAVE_C_RECORDMCOUNT 897 BUILD_C_RECORDMCOUNT := y 898 export BUILD_C_RECORDMCOUNT 899 endif 900endif 901ifdef CONFIG_HAVE_FENTRY 902 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 903 ifeq ($(call cc-option-yn, -mfentry),y) 904 CC_FLAGS_FTRACE += -mfentry 905 CC_FLAGS_USING += -DCC_USING_FENTRY 906 endif 907endif 908export CC_FLAGS_FTRACE 909KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 910KBUILD_AFLAGS += $(CC_FLAGS_USING) 911endif 912 913# We trigger additional mismatches with less inlining 914ifdef CONFIG_DEBUG_SECTION_MISMATCH 915KBUILD_CFLAGS += -fno-inline-functions-called-once 916endif 917 918# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 919ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 920KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 921KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 922LDFLAGS_vmlinux += --gc-sections 923endif 924 925ifdef CONFIG_SHADOW_CALL_STACK 926ifndef CONFIG_DYNAMIC_SCS 927CC_FLAGS_SCS := -fsanitize=shadow-call-stack 928KBUILD_CFLAGS += $(CC_FLAGS_SCS) 929endif 930export CC_FLAGS_SCS 931endif 932 933ifdef CONFIG_LTO_CLANG 934ifdef CONFIG_LTO_CLANG_THIN 935CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 936else 937CC_FLAGS_LTO := -flto 938endif 939CC_FLAGS_LTO += -fvisibility=hidden 940 941# Limit inlining across translation units to reduce binary size 942KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 943endif 944 945ifdef CONFIG_LTO 946KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 947KBUILD_AFLAGS += -fno-lto 948export CC_FLAGS_LTO 949endif 950 951ifdef CONFIG_CFI_CLANG 952CC_FLAGS_CFI := -fsanitize=kcfi 953KBUILD_CFLAGS += $(CC_FLAGS_CFI) 954export CC_FLAGS_CFI 955endif 956 957# Architectures can define flags to add/remove for floating-point support 958CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT 959export CC_FLAGS_FPU 960export CC_FLAGS_NO_FPU 961 962ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 963# Set the minimal function alignment. Use the newer GCC option 964# -fmin-function-alignment if it is available, or fall back to -falign-funtions. 965# See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. 966ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT 967KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) 968else 969KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 970endif 971endif 972 973# arch Makefile may override CC so keep this after arch Makefile is included 974NOSTDINC_FLAGS += -nostdinc 975 976# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 977# the kernel uses only C99 flexible arrays for dynamically sized trailing 978# arrays. Enforce this for everything that may examine structure sizes and 979# perform bounds checking. 980KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 981 982#Currently, disable -Wstringop-overflow for GCC 11, globally. 983KBUILD_CFLAGS-$(CONFIG_CC_NO_STRINGOP_OVERFLOW) += $(call cc-option, -Wno-stringop-overflow) 984KBUILD_CFLAGS-$(CONFIG_CC_STRINGOP_OVERFLOW) += $(call cc-option, -Wstringop-overflow) 985 986# disable invalid "can't wrap" optimizations for signed / pointers 987KBUILD_CFLAGS += -fno-strict-overflow 988 989# Make sure -fstack-check isn't enabled (like gentoo apparently did) 990KBUILD_CFLAGS += -fno-stack-check 991 992# conserve stack if available 993ifdef CONFIG_CC_IS_GCC 994KBUILD_CFLAGS += -fconserve-stack 995endif 996 997# change __FILE__ to the relative path from the srctree 998KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 999 1000# include additional Makefiles when needed 1001include-y := scripts/Makefile.extrawarn 1002include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1003include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1004include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1005include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1006include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1007include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1008include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1009include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1010include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1011 1012include $(addprefix $(srctree)/, $(include-y)) 1013 1014# scripts/Makefile.gcc-plugins is intentionally included last. 1015# Do not add $(call cc-option,...) below this line. When you build the kernel 1016# from the clean source tree, the GCC plugins do not exist at this point. 1017 1018# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1019KBUILD_CPPFLAGS += $(KCPPFLAGS) 1020KBUILD_AFLAGS += $(KAFLAGS) 1021KBUILD_CFLAGS += $(KCFLAGS) 1022KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1023 1024KBUILD_LDFLAGS_MODULE += --build-id=sha1 1025LDFLAGS_vmlinux += --build-id=sha1 1026 1027KBUILD_LDFLAGS += -z noexecstack 1028ifeq ($(CONFIG_LD_IS_BFD),y) 1029KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1030endif 1031 1032ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1033LDFLAGS_vmlinux += -X 1034endif 1035 1036ifeq ($(CONFIG_RELR),y) 1037# ld.lld before 15 did not support -z pack-relative-relocs. 1038LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1039endif 1040 1041# We never want expected sections to be placed heuristically by the 1042# linker. All sections should be explicitly named in the linker script. 1043ifdef CONFIG_LD_ORPHAN_WARN 1044LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1045endif 1046 1047# Align the bit size of userspace programs with the kernel 1048KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1049KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1050 1051# make the checker run with the right architecture 1052CHECKFLAGS += --arch=$(ARCH) 1053 1054# insure the checker run with the right endianness 1055CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1056 1057# the checker needs the correct machine size 1058CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1059 1060# Default kernel image to build when no specific target is given. 1061# KBUILD_IMAGE may be overruled on the command line or 1062# set in the environment 1063# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1064# this default value 1065export KBUILD_IMAGE ?= vmlinux 1066 1067# 1068# INSTALL_PATH specifies where to place the updated kernel and system map 1069# images. Default is /boot, but you can set it to other values 1070export INSTALL_PATH ?= /boot 1071 1072# 1073# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1074# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1075# an argument if needed. Otherwise it defaults to the kernel install path 1076# 1077export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1078 1079# 1080# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1081# relocations required by build roots. This is not defined in the 1082# makefile but the argument can be passed to make if needed. 1083# 1084 1085MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1086export MODLIB 1087 1088PHONY += prepare0 1089 1090export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1091export MODORDER := $(extmod_prefix)modules.order 1092export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1093 1094ifeq ($(KBUILD_EXTMOD),) 1095 1096build-dir := . 1097clean-dirs := $(sort . Documentation \ 1098 $(patsubst %/,%,$(filter %/, $(core-) \ 1099 $(drivers-) $(libs-)))) 1100 1101export ARCH_CORE := $(core-y) 1102export ARCH_LIB := $(filter %/, $(libs-y)) 1103export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1104# Externally visible symbols (used by link-vmlinux.sh) 1105 1106KBUILD_VMLINUX_OBJS := ./built-in.a 1107ifdef CONFIG_MODULES 1108KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1109KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1110else 1111KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1112endif 1113 1114export KBUILD_VMLINUX_LIBS 1115export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1116 1117ifdef CONFIG_TRIM_UNUSED_KSYMS 1118# For the kernel to actually contain only the needed exported symbols, 1119# we have to build modules as well to determine what those symbols are. 1120KBUILD_MODULES := 1 1121endif 1122 1123# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1124quiet_cmd_ar_vmlinux.a = AR $@ 1125 cmd_ar_vmlinux.a = \ 1126 rm -f $@; \ 1127 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1128 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1129 1130targets += vmlinux.a 1131vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1132 $(call if_changed,ar_vmlinux.a) 1133 1134PHONY += vmlinux_o 1135vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1136 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1137 1138vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1139 @: 1140 1141PHONY += vmlinux 1142# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1143# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1144# unrelated; the decompressors just happen to have the same base name, 1145# arch/*/boot/compressed/vmlinux. 1146# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1147# 1148# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1149# https://savannah.gnu.org/bugs/?61463 1150# For Make > 4.4, the following simple code will work: 1151# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1152vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1153vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1154vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1155 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1156 1157# The actual objects are generated when descending, 1158# make sure no implicit rule kicks in 1159$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1160 1161ifeq ($(origin KERNELRELEASE),file) 1162filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1163else 1164filechk_kernel.release = echo $(KERNELRELEASE) 1165endif 1166 1167# Store (new) KERNELRELEASE string in include/config/kernel.release 1168include/config/kernel.release: FORCE 1169 $(call filechk,kernel.release) 1170 1171# Additional helpers built in scripts/ 1172# Carefully list dependencies so we do not try to build scripts twice 1173# in parallel 1174PHONY += scripts 1175scripts: scripts_basic scripts_dtc 1176 $(Q)$(MAKE) $(build)=$(@) 1177 1178# Things we need to do before we recursively start building the kernel 1179# or the modules are listed in "prepare". 1180# A multi level approach is used. prepareN is processed before prepareN-1. 1181# archprepare is used in arch Makefiles and when processed asm symlink, 1182# version.h and scripts_basic is processed / created. 1183 1184PHONY += prepare archprepare 1185 1186archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1187 asm-generic $(version_h) include/generated/utsrelease.h \ 1188 include/generated/compile.h include/generated/autoconf.h remove-stale-files 1189 1190prepare0: archprepare 1191 $(Q)$(MAKE) $(build)=scripts/mod 1192 $(Q)$(MAKE) $(build)=. prepare 1193 1194# All the preparing.. 1195prepare: prepare0 1196ifdef CONFIG_RUST 1197 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1198 $(Q)$(MAKE) $(build)=rust 1199endif 1200 1201PHONY += remove-stale-files 1202remove-stale-files: 1203 $(Q)$(srctree)/scripts/remove-stale-files 1204 1205# Support for using generic headers in asm-generic 1206asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1207 1208PHONY += asm-generic uapi-asm-generic 1209asm-generic: uapi-asm-generic 1210 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1211 generic=include/asm-generic 1212uapi-asm-generic: 1213 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1214 generic=include/uapi/asm-generic 1215 1216# Generate some files 1217# --------------------------------------------------------------------------- 1218 1219# KERNELRELEASE can change from a few different places, meaning version.h 1220# needs to be updated, so this check is forced on all builds 1221 1222uts_len := 64 1223define filechk_utsrelease.h 1224 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1225 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1226 exit 1; \ 1227 fi; \ 1228 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1229endef 1230 1231define filechk_version.h 1232 if [ $(SUBLEVEL) -gt 255 ]; then \ 1233 echo \#define LINUX_VERSION_CODE $(shell \ 1234 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1235 else \ 1236 echo \#define LINUX_VERSION_CODE $(shell \ 1237 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1238 fi; \ 1239 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1240 ((c) > 255 ? 255 : (c)))'; \ 1241 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1242 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1243 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1244endef 1245 1246$(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1247$(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0) 1248$(version_h): FORCE 1249 $(call filechk,version.h) 1250 1251include/generated/utsrelease.h: include/config/kernel.release FORCE 1252 $(call filechk,utsrelease.h) 1253 1254filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1255 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1256 1257include/generated/compile.h: FORCE 1258 $(call filechk,compile.h) 1259 1260PHONY += headerdep 1261headerdep: 1262 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1263 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1264 1265# --------------------------------------------------------------------------- 1266# Kernel headers 1267 1268#Default location for installed headers 1269export INSTALL_HDR_PATH = $(objtree)/usr 1270 1271quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1272 cmd_headers_install = \ 1273 mkdir -p $(INSTALL_HDR_PATH); \ 1274 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1275 usr/include $(INSTALL_HDR_PATH) 1276 1277PHONY += headers_install 1278headers_install: headers 1279 $(call cmd,headers_install) 1280 1281PHONY += archheaders archscripts 1282 1283hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1284 1285PHONY += headers 1286headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1287 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML)) 1288 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1289 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1290 1291ifdef CONFIG_HEADERS_INSTALL 1292prepare: headers 1293endif 1294 1295PHONY += scripts_unifdef 1296scripts_unifdef: scripts_basic 1297 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1298 1299# --------------------------------------------------------------------------- 1300# Install 1301 1302# Many distributions have the custom install script, /sbin/installkernel. 1303# If DKMS is installed, 'make install' will eventually recurse back 1304# to this Makefile to build and install external modules. 1305# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1306 1307quiet_cmd_install = INSTALL $(INSTALL_PATH) 1308 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1309 1310# --------------------------------------------------------------------------- 1311# vDSO install 1312 1313PHONY += vdso_install 1314vdso_install: export INSTALL_FILES = $(vdso-install-y) 1315vdso_install: 1316 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1317 1318# --------------------------------------------------------------------------- 1319# Tools 1320 1321ifdef CONFIG_OBJTOOL 1322prepare: tools/objtool 1323endif 1324 1325ifdef CONFIG_BPF 1326ifdef CONFIG_DEBUG_INFO_BTF 1327prepare: tools/bpf/resolve_btfids 1328endif 1329endif 1330 1331PHONY += resolve_btfids_clean 1332 1333resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1334 1335# tools/bpf/resolve_btfids directory might not exist 1336# in output directory, skip its clean in that case 1337resolve_btfids_clean: 1338ifneq ($(wildcard $(resolve_btfids_O)),) 1339 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1340endif 1341 1342# Clear a bunch of variables before executing the submake 1343ifeq ($(quiet),silent_) 1344tools_silent=s 1345endif 1346 1347tools/: FORCE 1348 $(Q)mkdir -p $(objtree)/tools 1349 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1350 1351tools/%: FORCE 1352 $(Q)mkdir -p $(objtree)/tools 1353 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1354 1355# --------------------------------------------------------------------------- 1356# Kernel selftest 1357 1358PHONY += kselftest 1359kselftest: headers 1360 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1361 1362kselftest-%: headers FORCE 1363 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1364 1365PHONY += kselftest-merge 1366kselftest-merge: 1367 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1368 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1369 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1370 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1371 1372# --------------------------------------------------------------------------- 1373# Devicetree files 1374 1375ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1376dtstree := arch/$(SRCARCH)/boot/dts 1377endif 1378 1379ifneq ($(dtstree),) 1380 1381%.dtb: dtbs_prepare 1382 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1383 1384%.dtbo: dtbs_prepare 1385 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1386 1387PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1388dtbs: dtbs_prepare 1389 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1 1390 1391# include/config/kernel.release is actually needed when installing DTBs because 1392# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1393# dtbs_install depend on it as dtbs_install may run as root. 1394dtbs_prepare: include/config/kernel.release scripts_dtc 1395 1396ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1397export CHECK_DTBS=y 1398endif 1399 1400ifneq ($(CHECK_DTBS),) 1401dtbs_prepare: dt_binding_schemas 1402endif 1403 1404dtbs_check: dtbs 1405 1406dtbs_install: 1407 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) 1408 1409ifdef CONFIG_OF_EARLY_FLATTREE 1410all: dtbs 1411endif 1412 1413endif 1414 1415PHONY += scripts_dtc 1416scripts_dtc: scripts_basic 1417 $(Q)$(MAKE) $(build)=scripts/dtc 1418 1419ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1420export CHECK_DTBS=y 1421endif 1422 1423PHONY += dt_binding_check dt_binding_schemas 1424dt_binding_check: dt_binding_schemas scripts_dtc 1425 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1426 1427dt_binding_schemas: 1428 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1429 1430PHONY += dt_compatible_check 1431dt_compatible_check: dt_binding_schemas 1432 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1433 1434# --------------------------------------------------------------------------- 1435# Modules 1436 1437ifdef CONFIG_MODULES 1438 1439# By default, build modules as well 1440 1441all: modules 1442 1443# When we're building modules with modversions, we need to consider 1444# the built-in objects during the descend as well, in order to 1445# make sure the checksums are up to date before we record them. 1446ifdef CONFIG_MODVERSIONS 1447 KBUILD_BUILTIN := 1 1448endif 1449 1450# Build modules 1451# 1452 1453# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1454# is an exception. 1455ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1456KBUILD_BUILTIN := 1 1457modules: vmlinux 1458endif 1459 1460modules: modules_prepare 1461 1462# Target to prepare building external modules 1463modules_prepare: prepare 1464 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1465 1466endif # CONFIG_MODULES 1467 1468### 1469# Cleaning is done on three levels. 1470# make clean Delete most generated files 1471# Leave enough to build external modules 1472# make mrproper Delete the current configuration, and all generated files 1473# make distclean Remove editor backup files, patch leftover files and the like 1474 1475# Directories & files removed with 'make clean' 1476CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1477 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1478 compile_commands.json rust/test \ 1479 rust-project.json .vmlinux.objs .vmlinux.export.c 1480 1481# Directories & files removed with 'make mrproper' 1482MRPROPER_FILES += include/config include/generated \ 1483 arch/$(SRCARCH)/include/generated .objdiff \ 1484 debian snap tar-install \ 1485 .config .config.old .version \ 1486 Module.symvers \ 1487 certs/signing_key.pem \ 1488 certs/x509.genkey \ 1489 vmlinux-gdb.py \ 1490 rpmbuild \ 1491 rust/libmacros.so 1492 1493# clean - Delete most, but leave enough to build external modules 1494# 1495clean: private rm-files := $(CLEAN_FILES) 1496 1497PHONY += archclean vmlinuxclean 1498 1499vmlinuxclean: 1500 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1501 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1502 1503clean: archclean vmlinuxclean resolve_btfids_clean 1504 1505# mrproper - Delete all generated files, including .config 1506# 1507mrproper: private rm-files := $(MRPROPER_FILES) 1508mrproper-dirs := $(addprefix _mrproper_,scripts) 1509 1510PHONY += $(mrproper-dirs) mrproper 1511$(mrproper-dirs): 1512 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1513 1514mrproper: clean $(mrproper-dirs) 1515 $(call cmd,rmfiles) 1516 @find . $(RCS_FIND_IGNORE) \ 1517 \( -name '*.rmeta' \) \ 1518 -type f -print | xargs rm -f 1519 1520# distclean 1521# 1522PHONY += distclean 1523 1524distclean: mrproper 1525 @find . $(RCS_FIND_IGNORE) \ 1526 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1527 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1528 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1529 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1530 -type f -print | xargs rm -f 1531 1532 1533# Packaging of the kernel to various formats 1534# --------------------------------------------------------------------------- 1535 1536%src-pkg: FORCE 1537 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1538%pkg: include/config/kernel.release FORCE 1539 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1540 1541# Brief documentation of the typical targets used 1542# --------------------------------------------------------------------------- 1543 1544boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1545boards := $(sort $(notdir $(boards))) 1546board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1547board-dirs := $(sort $(notdir $(board-dirs:/=))) 1548 1549PHONY += help 1550help: 1551 @echo 'Cleaning targets:' 1552 @echo ' clean - Remove most generated files but keep the config and' 1553 @echo ' enough build support to build external modules' 1554 @echo ' mrproper - Remove all generated files + config + various backup files' 1555 @echo ' distclean - mrproper + remove editor backup and patch files' 1556 @echo '' 1557 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1558 @echo '' 1559 @echo 'Other generic targets:' 1560 @echo ' all - Build all targets marked with [*]' 1561 @echo '* vmlinux - Build the bare kernel' 1562 @echo '* modules - Build all modules' 1563 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1564 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1565 @echo ' dir/ - Build all files in dir and below' 1566 @echo ' dir/file.[ois] - Build specified target only' 1567 @echo ' dir/file.ll - Build the LLVM assembly file' 1568 @echo ' (requires compiler support for LLVM assembly generation)' 1569 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1570 @echo ' (requires a recent binutils and recent build (System.map))' 1571 @echo ' dir/file.ko - Build module including final link' 1572 @echo ' modules_prepare - Set up for building external modules' 1573 @echo ' tags/TAGS - Generate tags file for editors' 1574 @echo ' cscope - Generate cscope index' 1575 @echo ' gtags - Generate GNU GLOBAL index' 1576 @echo ' kernelrelease - Output the release version string (use with make -s)' 1577 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1578 @echo ' image_name - Output the image name (use with make -s)' 1579 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1580 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1581 echo '' 1582 @echo 'Static analysers:' 1583 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1584 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1585 @echo ' versioncheck - Sanity check on version.h usage' 1586 @echo ' includecheck - Check for duplicate included header files' 1587 @echo ' export_report - List the usages of all exported symbols' 1588 @echo ' headerdep - Detect inclusion cycles in headers' 1589 @echo ' coccicheck - Check with Coccinelle' 1590 @echo ' clang-analyzer - Check with clang static analyzer' 1591 @echo ' clang-tidy - Check with clang-tidy' 1592 @echo '' 1593 @echo 'Tools:' 1594 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1595 @echo '' 1596 @echo 'Kernel selftest:' 1597 @echo ' kselftest - Build and run kernel selftest' 1598 @echo ' Build, install, and boot kernel before' 1599 @echo ' running kselftest on it' 1600 @echo ' Run as root for full coverage' 1601 @echo ' kselftest-all - Build kernel selftest' 1602 @echo ' kselftest-install - Build and install kernel selftest' 1603 @echo ' kselftest-clean - Remove all generated kselftest files' 1604 @echo ' kselftest-merge - Merge all the config dependencies of' 1605 @echo ' kselftest to existing .config.' 1606 @echo '' 1607 @echo 'Rust targets:' 1608 @echo ' rustavailable - Checks whether the Rust toolchain is' 1609 @echo ' available and, if not, explains why.' 1610 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1611 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1612 @echo ' is formatted, printing a diff otherwise.' 1613 @echo ' rustdoc - Generate Rust documentation' 1614 @echo ' (requires kernel .config)' 1615 @echo ' rusttest - Runs the Rust tests' 1616 @echo ' (requires kernel .config; downloads external repos)' 1617 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1618 @echo ' (requires kernel .config)' 1619 @echo ' dir/file.[os] - Build specified target only' 1620 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1621 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1622 @echo ' The output is not intended to be compilable.' 1623 @echo ' dir/file.ll - Build the LLVM assembly file' 1624 @echo '' 1625 @$(if $(dtstree), \ 1626 echo 'Devicetree:'; \ 1627 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1628 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1629 echo ' dt_binding_check - Validate device tree binding documents and examples'; \ 1630 echo ' dt_binding_schema - Build processed device tree binding schemas'; \ 1631 echo ' dtbs_check - Validate device tree source files';\ 1632 echo '') 1633 1634 @echo 'Userspace tools targets:' 1635 @echo ' use "make tools/help"' 1636 @echo ' or "cd tools; make help"' 1637 @echo '' 1638 @echo 'Kernel packaging:' 1639 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1640 @echo '' 1641 @echo 'Documentation targets:' 1642 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1643 @echo '' 1644 @echo 'Architecture-specific targets ($(SRCARCH)):' 1645 @$(or $(archhelp),\ 1646 echo ' No architecture-specific help defined for $(SRCARCH)') 1647 @echo '' 1648 @$(if $(boards), \ 1649 $(foreach b, $(boards), \ 1650 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1651 echo '') 1652 @$(if $(board-dirs), \ 1653 $(foreach b, $(board-dirs), \ 1654 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1655 printf " %-16s - Show all of the above\\n" help-boards; \ 1656 echo '') 1657 1658 @echo ' make V=n [targets] 1: verbose build' 1659 @echo ' 2: give reason for rebuild of target' 1660 @echo ' V=1 and V=2 can be combined with V=12' 1661 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1662 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1663 @echo ' (sparse by default)' 1664 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1665 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1666 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where' 1667 @echo ' 1: warnings which may be relevant and do not occur too often' 1668 @echo ' 2: warnings which occur quite often but may still be relevant' 1669 @echo ' 3: more obscure warnings, can most likely be ignored' 1670 @echo ' c: extra checks in the configuration stage (Kconfig)' 1671 @echo ' e: warnings are being treated as errors' 1672 @echo ' Multiple levels can be combined with W=12 or W=123' 1673 @$(if $(dtstree), \ 1674 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1675 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1676 ) 1677 @echo '' 1678 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1679 @echo 'For further info see the ./README file' 1680 1681 1682help-board-dirs := $(addprefix help-,$(board-dirs)) 1683 1684help-boards: $(help-board-dirs) 1685 1686boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1687 1688$(help-board-dirs): help-%: 1689 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1690 @$(if $(boards-per-dir), \ 1691 $(foreach b, $(boards-per-dir), \ 1692 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1693 echo '') 1694 1695 1696# Documentation targets 1697# --------------------------------------------------------------------------- 1698DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1699 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs 1700PHONY += $(DOC_TARGETS) 1701$(DOC_TARGETS): 1702 $(Q)$(MAKE) $(build)=Documentation $@ 1703 1704 1705# Rust targets 1706# --------------------------------------------------------------------------- 1707 1708# "Is Rust available?" target 1709PHONY += rustavailable 1710rustavailable: 1711 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1712 1713# Documentation target 1714# 1715# Using the singular to avoid running afoul of `no-dot-config-targets`. 1716PHONY += rustdoc 1717rustdoc: prepare 1718 $(Q)$(MAKE) $(build)=rust $@ 1719 1720# Testing target 1721PHONY += rusttest 1722rusttest: prepare 1723 $(Q)$(MAKE) $(build)=rust $@ 1724 1725# Formatting targets 1726PHONY += rustfmt rustfmtcheck 1727 1728# We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream. 1729# 1730# We match using absolute paths since `find` does not resolve them 1731# when matching, which is a problem when e.g. `srctree` is `..`. 1732# We `grep` afterwards in order to remove the directory entry itself. 1733rustfmt: 1734 $(Q)find $(abs_srctree) -type f -name '*.rs' \ 1735 -o -path $(abs_srctree)/rust/alloc -prune \ 1736 -o -path $(abs_objtree)/rust/test -prune \ 1737 | grep -Fv $(abs_srctree)/rust/alloc \ 1738 | grep -Fv $(abs_objtree)/rust/test \ 1739 | grep -Fv generated \ 1740 | xargs $(RUSTFMT) $(rustfmt_flags) 1741 1742rustfmtcheck: rustfmt_flags = --check 1743rustfmtcheck: rustfmt 1744 1745# Misc 1746# --------------------------------------------------------------------------- 1747 1748PHONY += misc-check 1749misc-check: 1750 $(Q)$(srctree)/scripts/misc-check 1751 1752all: misc-check 1753 1754PHONY += scripts_gdb 1755scripts_gdb: prepare0 1756 $(Q)$(MAKE) $(build)=scripts/gdb 1757 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1758 1759ifdef CONFIG_GDB_SCRIPTS 1760all: scripts_gdb 1761endif 1762 1763else # KBUILD_EXTMOD 1764 1765filechk_kernel.release = echo $(KERNELRELEASE) 1766 1767### 1768# External module support. 1769# When building external modules the kernel used as basis is considered 1770# read-only, and no consistency checks are made and the make 1771# system is not used on the basis kernel. If updates are required 1772# in the basis kernel ordinary make commands (without M=...) must be used. 1773 1774# We are always building only modules. 1775KBUILD_BUILTIN := 1776KBUILD_MODULES := 1 1777 1778build-dir := $(KBUILD_EXTMOD) 1779 1780compile_commands.json: $(extmod_prefix)compile_commands.json 1781PHONY += compile_commands.json 1782 1783clean-dirs := $(KBUILD_EXTMOD) 1784clean: private rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1785 $(KBUILD_EXTMOD)/compile_commands.json 1786 1787PHONY += prepare 1788# now expand this into a simple variable to reduce the cost of shell evaluations 1789prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1790prepare: 1791 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1792 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1793 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1794 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1795 fi 1796 1797PHONY += help 1798help: 1799 @echo ' Building external modules.' 1800 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1801 @echo '' 1802 @echo ' modules - default target, build the module(s)' 1803 @echo ' modules_install - install the module' 1804 @echo ' clean - remove generated files in module directory only' 1805 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 1806 @echo '' 1807 1808ifndef CONFIG_MODULES 1809modules modules_install: __external_modules_error 1810__external_modules_error: 1811 @echo >&2 '***' 1812 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 1813 @echo >&2 '*** You cannot build or install external modules.' 1814 @echo >&2 '***' 1815 @false 1816endif 1817 1818endif # KBUILD_EXTMOD 1819 1820# --------------------------------------------------------------------------- 1821# Modules 1822 1823PHONY += modules modules_install modules_sign modules_prepare 1824 1825modules_install: 1826 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 1827 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 1828 1829ifeq ($(CONFIG_MODULE_SIG),y) 1830# modules_sign is a subset of modules_install. 1831# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1832modules_sign: modules_install 1833 @: 1834else 1835modules_sign: 1836 @echo >&2 '***' 1837 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 1838 @echo >&2 '***' 1839 @false 1840endif 1841 1842ifdef CONFIG_MODULES 1843 1844$(MODORDER): $(build-dir) 1845 @: 1846 1847# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1848# This is solely useful to speed up test compiles. 1849modules: modpost 1850ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1851 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1852endif 1853 1854PHONY += modules_check 1855modules_check: $(MODORDER) 1856 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1857 1858else # CONFIG_MODULES 1859 1860modules: 1861 @: 1862 1863KBUILD_MODULES := 1864 1865endif # CONFIG_MODULES 1866 1867PHONY += modpost 1868modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 1869 $(if $(KBUILD_MODULES), modules_check) 1870 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1871 1872# Single targets 1873# --------------------------------------------------------------------------- 1874# To build individual files in subdirectories, you can do like this: 1875# 1876# make foo/bar/baz.s 1877# 1878# The supported suffixes for single-target are listed in 'single-targets' 1879# 1880# To build only under specific subdirectories, you can do like this: 1881# 1882# make foo/bar/baz/ 1883 1884ifdef single-build 1885 1886# .ko is special because modpost is needed 1887single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1888single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 1889 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 1890 1891$(single-ko): single_modules 1892 @: 1893$(single-no-ko): $(build-dir) 1894 @: 1895 1896# Remove MODORDER when done because it is not the real one. 1897PHONY += single_modules 1898single_modules: $(single-no-ko) modules_prepare 1899 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER) 1900 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1901ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1902 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1903endif 1904 $(Q)rm -f $(MODORDER) 1905 1906single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 1907 1908KBUILD_MODULES := 1 1909 1910endif 1911 1912# Preset locale variables to speed up the build process. Limit locale 1913# tweaks to this spot to avoid wrong language settings when running 1914# make menuconfig etc. 1915# Error messages still appears in the original language 1916PHONY += $(build-dir) 1917$(build-dir): prepare 1918 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 1919 1920clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1921PHONY += $(clean-dirs) clean 1922$(clean-dirs): 1923 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1924 1925clean: $(clean-dirs) 1926 $(call cmd,rmfiles) 1927 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1928 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 1929 -o -name '*.ko.*' \ 1930 -o -name '*.dtb' -o -name '*.dtbo' \ 1931 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 1932 -o -name '*.dt.yaml' -o -name 'dtbs-list' \ 1933 -o -name '*.dwo' -o -name '*.lst' \ 1934 -o -name '*.su' -o -name '*.mod' \ 1935 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1936 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1937 -o -name '*.asn1.[ch]' \ 1938 -o -name '*.symtypes' -o -name 'modules.order' \ 1939 -o -name '*.c.[012]*.*' \ 1940 -o -name '*.ll' \ 1941 -o -name '*.gcno' \ 1942 -o -name '*.*.symversions' \) -type f -print \ 1943 -o -name '.tmp_*' -print \ 1944 | xargs rm -rf 1945 1946# Generate tags for editors 1947# --------------------------------------------------------------------------- 1948quiet_cmd_tags = GEN $@ 1949 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1950 1951tags TAGS cscope gtags: FORCE 1952 $(call cmd,tags) 1953 1954# IDE support targets 1955PHONY += rust-analyzer 1956rust-analyzer: 1957 $(Q)$(MAKE) $(build)=rust $@ 1958 1959# Script to generate missing namespace dependencies 1960# --------------------------------------------------------------------------- 1961 1962PHONY += nsdeps 1963nsdeps: export KBUILD_NSDEPS=1 1964nsdeps: modules 1965 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1966 1967# Clang Tooling 1968# --------------------------------------------------------------------------- 1969 1970quiet_cmd_gen_compile_commands = GEN $@ 1971 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1972 1973$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1974 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 1975 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1976 $(call if_changed,gen_compile_commands) 1977 1978targets += $(extmod_prefix)compile_commands.json 1979 1980PHONY += clang-tidy clang-analyzer 1981 1982ifdef CONFIG_CC_IS_CLANG 1983quiet_cmd_clang_tools = CHECK $< 1984 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1985 1986clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 1987 $(call cmd,clang_tools) 1988else 1989clang-tidy clang-analyzer: 1990 @echo "$@ requires CC=clang" >&2 1991 @false 1992endif 1993 1994# Scripts to check various things for consistency 1995# --------------------------------------------------------------------------- 1996 1997PHONY += includecheck versioncheck coccicheck export_report 1998 1999includecheck: 2000 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2001 -name '*.[hcS]' -type f -print | sort \ 2002 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2003 2004versioncheck: 2005 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2006 -name '*.[hcS]' -type f -print | sort \ 2007 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2008 2009coccicheck: 2010 $(Q)$(BASH) $(srctree)/scripts/$@ 2011 2012export_report: 2013 $(PERL) $(srctree)/scripts/export_report.pl 2014 2015PHONY += checkstack kernelrelease kernelversion image_name 2016 2017# UML needs a little special treatment here. It wants to use the host 2018# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2019# else wants $(ARCH), including people doing cross-builds, which means 2020# that $(SUBARCH) doesn't work here. 2021ifeq ($(ARCH), um) 2022CHECKSTACK_ARCH := $(SUBARCH) 2023else 2024CHECKSTACK_ARCH := $(ARCH) 2025endif 2026MINSTACKSIZE ?= 100 2027checkstack: 2028 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2029 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2030 2031kernelrelease: 2032 @$(filechk_kernel.release) 2033 2034kernelversion: 2035 @echo $(KERNELVERSION) 2036 2037image_name: 2038 @echo $(KBUILD_IMAGE) 2039 2040PHONY += run-command 2041run-command: 2042 $(Q)$(KBUILD_RUN_COMMAND) 2043 2044quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2045 cmd_rmfiles = rm -rf $(rm-files) 2046 2047# read saved command lines for existing targets 2048existing-targets := $(wildcard $(sort $(targets))) 2049 2050-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2051 2052endif # config-build 2053endif # mixed-build 2054endif # need-sub-make 2055 2056PHONY += FORCE 2057FORCE: 2058 2059# Declare the contents of the PHONY variable as phony. We keep that 2060# information in a variable so we can use it in if_changed and friends. 2061.PHONY: $(PHONY) 2062