1# SPDX-License-Identifier: GPL-2.0 2VERSION = 6 3PATCHLEVEL = 4 4SUBLEVEL = 0 5EXTRAVERSION = 6NAME = Hurr durr I'ma ninja sloth 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 ($(filter undefine,$(.FEATURES)),) 15$(error GNU Make >= 3.82 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)) 42export abs_srctree := $(realpath $(dir $(this-makefile))) 43export abs_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, $(KBUILD_VERBOSE)),) 90 quiet = 91 Q = 92endif 93 94# If the user is running make -s (silent mode), suppress echoing of 95# commands 96# make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS. 97 98ifeq ($(filter 3.%,$(MAKE_VERSION)),) 99short-opts := $(firstword -$(MAKEFLAGS)) 100else 101short-opts := $(filter-out --%,$(MAKEFLAGS)) 102endif 103 104ifneq ($(findstring s,$(short-opts)),) 105quiet=silent_ 106override KBUILD_VERBOSE := 107endif 108 109export quiet Q KBUILD_VERBOSE 110 111# Call a source code checker (by default, "sparse") as part of the 112# C compilation. 113# 114# Use 'make C=1' to enable checking of only re-compiled files. 115# Use 'make C=2' to enable checking of *all* source files, regardless 116# of whether they are re-compiled or not. 117# 118# See the file "Documentation/dev-tools/sparse.rst" for more details, 119# including where to get the "sparse" utility. 120 121ifeq ("$(origin C)", "command line") 122 KBUILD_CHECKSRC = $(C) 123endif 124ifndef KBUILD_CHECKSRC 125 KBUILD_CHECKSRC = 0 126endif 127 128export KBUILD_CHECKSRC 129 130# Enable "clippy" (a linter) as part of the Rust compilation. 131# 132# Use 'make CLIPPY=1' to enable it. 133ifeq ("$(origin CLIPPY)", "command line") 134 KBUILD_CLIPPY := $(CLIPPY) 135endif 136 137export KBUILD_CLIPPY 138 139# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 140# directory of external module to build. Setting M= takes precedence. 141ifeq ("$(origin M)", "command line") 142 KBUILD_EXTMOD := $(M) 143endif 144 145$(if $(word 2, $(KBUILD_EXTMOD)), \ 146 $(error building multiple external modules is not supported)) 147 148$(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \ 149 $(error module directory path cannot contain '$x'))) 150 151# Remove trailing slashes 152ifneq ($(filter %/, $(KBUILD_EXTMOD)),) 153KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) 154endif 155 156export KBUILD_EXTMOD 157 158# Kbuild will save output files in the current working directory. 159# This does not need to match to the root of the kernel source tree. 160# 161# For example, you can do this: 162# 163# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 164# 165# If you want to save output files in a different location, there are 166# two syntaxes to specify it. 167# 168# 1) O= 169# Use "make O=dir/to/store/output/files/" 170# 171# 2) Set KBUILD_OUTPUT 172# Set the environment variable KBUILD_OUTPUT to point to the output directory. 173# export KBUILD_OUTPUT=dir/to/store/output/files/; make 174# 175# The O= assignment takes precedence over the KBUILD_OUTPUT environment 176# variable. 177 178# Do we want to change the working directory? 179ifeq ("$(origin O)", "command line") 180 KBUILD_OUTPUT := $(O) 181endif 182 183ifneq ($(KBUILD_OUTPUT),) 184# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 185# expand a shell special character '~'. We use a somewhat tedious way here. 186abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 187$(if $(abs_objtree),, \ 188 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 189 190# $(realpath ...) resolves symlinks 191abs_objtree := $(realpath $(abs_objtree)) 192endif # ifneq ($(KBUILD_OUTPUT),) 193 194ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 195$(error source directory cannot contain spaces or colons) 196endif 197 198ifneq ($(filter 3.%,$(MAKE_VERSION)),) 199# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 200# We need to invoke sub-make to avoid implicit rules in the top Makefile. 201need-sub-make := 1 202# Cancel implicit rules for this Makefile. 203$(this-makefile): ; 204endif 205 206export sub_make_done := 1 207 208endif # sub_make_done 209 210ifeq ($(abs_objtree),$(CURDIR)) 211# Suppress "Entering directory ..." if we are at the final work directory. 212no-print-directory := --no-print-directory 213else 214# Recursion to show "Entering directory ..." 215need-sub-make := 1 216endif 217 218ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),) 219# If --no-print-directory is unset, recurse once again to set it. 220# You may end up recursing into __sub-make twice. This is needed due to the 221# behavior change in GNU Make 4.4.1. 222need-sub-make := 1 223endif 224 225ifeq ($(need-sub-make),1) 226 227PHONY += $(MAKECMDGOALS) __sub-make 228 229$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 230 @: 231 232# Invoke a second make in the output directory, passing relevant variables 233__sub-make: 234 $(Q)$(MAKE) $(no-print-directory) -C $(abs_objtree) \ 235 -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 236 237else # need-sub-make 238 239# We process the rest of the Makefile if this is the final invocation of make 240 241ifeq ($(abs_srctree),$(abs_objtree)) 242 # building in the source tree 243 srctree := . 244 building_out_of_srctree := 245else 246 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 247 # building in a subdirectory of the source tree 248 srctree := .. 249 else 250 srctree := $(abs_srctree) 251 endif 252 building_out_of_srctree := 1 253endif 254 255ifneq ($(KBUILD_ABS_SRCTREE),) 256srctree := $(abs_srctree) 257endif 258 259objtree := . 260VPATH := $(srctree) 261 262export building_out_of_srctree srctree objtree VPATH 263 264# To make sure we do not include .config for any of the *config targets 265# catch them early, and hand them over to scripts/kconfig/Makefile 266# It is allowed to specify more targets when calling make, including 267# mixing *config targets and build targets. 268# For example 'make oldconfig all'. 269# Detect when mixed targets is specified, and make a second invocation 270# of make so .config is not included in this case either (for *config). 271 272version_h := include/generated/uapi/linux/version.h 273 274clean-targets := %clean mrproper cleandocs 275no-dot-config-targets := $(clean-targets) \ 276 cscope gtags TAGS tags help% %docs check% coccicheck \ 277 $(version_h) headers headers_% archheaders archscripts \ 278 %asm-generic kernelversion %src-pkg dt_binding_check \ 279 outputmakefile rustavailable rustfmt rustfmtcheck 280# Installation targets should not require compiler. Unfortunately, vdso_install 281# is an exception where build artifacts may be updated. This must be fixed. 282no-compiler-targets := $(no-dot-config-targets) install dtbs_install \ 283 headers_install modules_install kernelrelease image_name 284no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \ 285 image_name 286single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/ 287 288config-build := 289mixed-build := 290need-config := 1 291need-compiler := 1 292may-sync-config := 1 293single-build := 294 295ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 296 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 297 need-config := 298 endif 299endif 300 301ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),) 302 ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),) 303 need-compiler := 304 endif 305endif 306 307ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 308 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 309 may-sync-config := 310 endif 311endif 312 313ifneq ($(KBUILD_EXTMOD),) 314 may-sync-config := 315endif 316 317ifeq ($(KBUILD_EXTMOD),) 318 ifneq ($(filter %config,$(MAKECMDGOALS)),) 319 config-build := 1 320 ifneq ($(words $(MAKECMDGOALS)),1) 321 mixed-build := 1 322 endif 323 endif 324endif 325 326# We cannot build single targets and the others at the same time 327ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 328 single-build := 1 329 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 330 mixed-build := 1 331 endif 332endif 333 334# For "make -j clean all", "make -j mrproper defconfig all", etc. 335ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 336 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 337 mixed-build := 1 338 endif 339endif 340 341# install and modules_install need also be processed one by one 342ifneq ($(filter install,$(MAKECMDGOALS)),) 343 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 344 mixed-build := 1 345 endif 346endif 347 348ifdef mixed-build 349# =========================================================================== 350# We're called with mixed targets (*config and build targets). 351# Handle them one by one. 352 353PHONY += $(MAKECMDGOALS) __build_one_by_one 354 355$(MAKECMDGOALS): __build_one_by_one 356 @: 357 358__build_one_by_one: 359 $(Q)set -e; \ 360 for i in $(MAKECMDGOALS); do \ 361 $(MAKE) -f $(srctree)/Makefile $$i; \ 362 done 363 364else # !mixed-build 365 366include $(srctree)/scripts/Kbuild.include 367 368# Read KERNELRELEASE from include/config/kernel.release (if it exists) 369KERNELRELEASE = $(call read-file, include/config/kernel.release) 370KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 371export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 372 373include $(srctree)/scripts/subarch.include 374 375# Cross compiling and selecting different set of gcc/bin-utils 376# --------------------------------------------------------------------------- 377# 378# When performing cross compilation for other architectures ARCH shall be set 379# to the target architecture. (See arch/* for the possibilities). 380# ARCH can be set during invocation of make: 381# make ARCH=ia64 382# Another way is to have ARCH set in the environment. 383# The default ARCH is the host where make is executed. 384 385# CROSS_COMPILE specify the prefix used for all executables used 386# during compilation. Only gcc and related bin-utils executables 387# are prefixed with $(CROSS_COMPILE). 388# CROSS_COMPILE can be set on the command line 389# make CROSS_COMPILE=ia64-linux- 390# Alternatively CROSS_COMPILE can be set in the environment. 391# Default value for CROSS_COMPILE is not to prefix executables 392# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 393ARCH ?= $(SUBARCH) 394 395# Architecture as present in compile.h 396UTS_MACHINE := $(ARCH) 397SRCARCH := $(ARCH) 398 399# Additional ARCH settings for x86 400ifeq ($(ARCH),i386) 401 SRCARCH := x86 402endif 403ifeq ($(ARCH),x86_64) 404 SRCARCH := x86 405endif 406 407# Additional ARCH settings for sparc 408ifeq ($(ARCH),sparc32) 409 SRCARCH := sparc 410endif 411ifeq ($(ARCH),sparc64) 412 SRCARCH := sparc 413endif 414 415# Additional ARCH settings for parisc 416ifeq ($(ARCH),parisc64) 417 SRCARCH := parisc 418endif 419 420export cross_compiling := 421ifneq ($(SRCARCH),$(SUBARCH)) 422cross_compiling := 1 423endif 424 425KCONFIG_CONFIG ?= .config 426export KCONFIG_CONFIG 427 428# SHELL used by kbuild 429CONFIG_SHELL := sh 430 431HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 432HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 433HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 434 435ifneq ($(LLVM),) 436ifneq ($(filter %/,$(LLVM)),) 437LLVM_PREFIX := $(LLVM) 438else ifneq ($(filter -%,$(LLVM)),) 439LLVM_SUFFIX := $(LLVM) 440endif 441 442HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 443HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 444else 445HOSTCC = gcc 446HOSTCXX = g++ 447endif 448HOSTRUSTC = rustc 449HOSTPKG_CONFIG = pkg-config 450 451KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 452 -O2 -fomit-frame-pointer -std=gnu11 \ 453 -Wdeclaration-after-statement 454KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 455KBUILD_USERLDFLAGS := $(USERLDFLAGS) 456 457# These flags apply to all Rust code in the tree, including the kernel and 458# host programs. 459export rust_common_flags := --edition=2021 \ 460 -Zbinary_dep_depinfo=y \ 461 -Dunsafe_op_in_unsafe_fn -Drust_2018_idioms \ 462 -Dunreachable_pub -Dnon_ascii_idents \ 463 -Wmissing_docs \ 464 -Drustdoc::missing_crate_level_docs \ 465 -Dclippy::correctness -Dclippy::style \ 466 -Dclippy::suspicious -Dclippy::complexity \ 467 -Dclippy::perf \ 468 -Dclippy::let_unit_value -Dclippy::mut_mut \ 469 -Dclippy::needless_bitwise_bool \ 470 -Dclippy::needless_continue \ 471 -Wclippy::dbg_macro 472 473KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 474KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 475KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 476 -Zallow-features= $(HOSTRUSTFLAGS) 477KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 478KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 479 480# Make variables (CC, etc...) 481CPP = $(CC) -E 482ifneq ($(LLVM),) 483CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 484LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 485AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 486NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 487OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 488OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 489READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 490STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 491else 492CC = $(CROSS_COMPILE)gcc 493LD = $(CROSS_COMPILE)ld 494AR = $(CROSS_COMPILE)ar 495NM = $(CROSS_COMPILE)nm 496OBJCOPY = $(CROSS_COMPILE)objcopy 497OBJDUMP = $(CROSS_COMPILE)objdump 498READELF = $(CROSS_COMPILE)readelf 499STRIP = $(CROSS_COMPILE)strip 500endif 501RUSTC = rustc 502RUSTDOC = rustdoc 503RUSTFMT = rustfmt 504CLIPPY_DRIVER = clippy-driver 505BINDGEN = bindgen 506CARGO = cargo 507PAHOLE = pahole 508RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 509LEX = flex 510YACC = bison 511AWK = awk 512INSTALLKERNEL := installkernel 513DEPMOD = depmod 514PERL = perl 515PYTHON3 = python3 516CHECK = sparse 517BASH = bash 518KGZIP = gzip 519KBZIP2 = bzip2 520KLZOP = lzop 521LZMA = lzma 522LZ4 = lz4c 523XZ = xz 524ZSTD = zstd 525 526PAHOLE_FLAGS = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh) 527 528CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 529 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 530NOSTDINC_FLAGS := 531CFLAGS_MODULE = 532RUSTFLAGS_MODULE = 533AFLAGS_MODULE = 534LDFLAGS_MODULE = 535CFLAGS_KERNEL = 536RUSTFLAGS_KERNEL = 537AFLAGS_KERNEL = 538LDFLAGS_vmlinux = 539 540# Use USERINCLUDE when you must reference the UAPI directories only. 541USERINCLUDE := \ 542 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 543 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 544 -I$(srctree)/include/uapi \ 545 -I$(objtree)/include/generated/uapi \ 546 -include $(srctree)/include/linux/compiler-version.h \ 547 -include $(srctree)/include/linux/kconfig.h 548 549# Use LINUXINCLUDE when you must reference the include/ directory. 550# Needed to be compatible with the O= option 551LINUXINCLUDE := \ 552 -I$(srctree)/arch/$(SRCARCH)/include \ 553 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 554 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 555 -I$(objtree)/include \ 556 $(USERINCLUDE) 557 558KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 559KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 560 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 561 -Werror=implicit-function-declaration -Werror=implicit-int \ 562 -Werror=return-type -Wno-format-security -funsigned-char \ 563 -std=gnu11 564KBUILD_CPPFLAGS := -D__KERNEL__ 565KBUILD_RUSTFLAGS := $(rust_common_flags) \ 566 --target=$(objtree)/scripts/target.json \ 567 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 568 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 569 -Csymbol-mangling-version=v0 \ 570 -Crelocation-model=static \ 571 -Zfunction-sections=n \ 572 -Dclippy::float_arithmetic 573 574KBUILD_AFLAGS_KERNEL := 575KBUILD_CFLAGS_KERNEL := 576KBUILD_RUSTFLAGS_KERNEL := 577KBUILD_AFLAGS_MODULE := -DMODULE 578KBUILD_CFLAGS_MODULE := -DMODULE 579KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 580KBUILD_LDFLAGS_MODULE := 581KBUILD_LDFLAGS := 582CLANG_FLAGS := 583 584ifeq ($(KBUILD_CLIPPY),1) 585 RUSTC_OR_CLIPPY_QUIET := CLIPPY 586 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 587else 588 RUSTC_OR_CLIPPY_QUIET := RUSTC 589 RUSTC_OR_CLIPPY = $(RUSTC) 590endif 591 592ifdef RUST_LIB_SRC 593 export RUST_LIB_SRC 594endif 595 596# Allows the usage of unstable features in stable compilers. 597export RUSTC_BOOTSTRAP := 1 598 599export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 600export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO 601export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 602export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 603export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 604export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 605export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 606export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 607 608export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 609export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 610export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 611export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 612export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 613export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 614export PAHOLE_FLAGS 615 616# Files to ignore in find ... statements 617 618export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 619 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 620 -prune -o 621export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 622 --exclude CVS --exclude .pc --exclude .hg --exclude .git 623 624# =========================================================================== 625# Rules shared between *config targets and build targets 626 627# Basic helpers built in scripts/basic/ 628PHONY += scripts_basic 629scripts_basic: 630 $(Q)$(MAKE) $(build)=scripts/basic 631 632PHONY += outputmakefile 633ifdef building_out_of_srctree 634# Before starting out-of-tree build, make sure the source tree is clean. 635# outputmakefile generates a Makefile in the output directory, if using a 636# separate output directory. This allows convenient use of make in the 637# output directory. 638# At the same time when output Makefile generated, generate .gitignore to 639# ignore whole output directory 640 641quiet_cmd_makefile = GEN Makefile 642 cmd_makefile = { \ 643 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 644 echo "include $(srctree)/Makefile"; \ 645 } > Makefile 646 647outputmakefile: 648 @if [ -f $(srctree)/.config -o \ 649 -d $(srctree)/include/config -o \ 650 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 651 echo >&2 "***"; \ 652 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 653 echo >&2 "*** in $(abs_srctree)";\ 654 echo >&2 "***"; \ 655 false; \ 656 fi 657 $(Q)ln -fsn $(srctree) source 658 $(call cmd,makefile) 659 $(Q)test -e .gitignore || \ 660 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 661endif 662 663# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 664# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 665# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 666# and from include/config/auto.conf.cmd to detect the compiler upgrade. 667CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 668 669ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 670include $(srctree)/scripts/Makefile.clang 671endif 672 673# Include this also for config targets because some architectures need 674# cc-cross-prefix to determine CROSS_COMPILE. 675ifdef need-compiler 676include $(srctree)/scripts/Makefile.compiler 677endif 678 679ifdef config-build 680# =========================================================================== 681# *config targets only - make sure prerequisites are updated, and descend 682# in scripts/kconfig to make the *config target 683 684# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 685# KBUILD_DEFCONFIG may point out an alternative default configuration 686# used for 'make defconfig' 687include $(srctree)/arch/$(SRCARCH)/Makefile 688export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 689 690config: outputmakefile scripts_basic FORCE 691 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 692 693%config: outputmakefile scripts_basic FORCE 694 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 695 696else #!config-build 697# =========================================================================== 698# Build targets only - this includes vmlinux, arch specific targets, clean 699# targets and others. In general all targets except *config targets. 700 701# If building an external module we do not care about the all: rule 702# but instead __all depend on modules 703PHONY += all 704ifeq ($(KBUILD_EXTMOD),) 705__all: all 706else 707__all: modules 708endif 709 710targets := 711 712# Decide whether to build built-in, modular, or both. 713# Normally, just do built-in. 714 715KBUILD_MODULES := 716KBUILD_BUILTIN := 1 717 718# If we have only "make modules", don't compile built-in objects. 719ifeq ($(MAKECMDGOALS),modules) 720 KBUILD_BUILTIN := 721endif 722 723# If we have "make <whatever> modules", compile modules 724# in addition to whatever we do anyway. 725# Just "make" or "make all" shall build modules as well 726 727ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 728 KBUILD_MODULES := 1 729endif 730 731ifeq ($(MAKECMDGOALS),) 732 KBUILD_MODULES := 1 733endif 734 735export KBUILD_MODULES KBUILD_BUILTIN 736 737ifdef need-config 738include include/config/auto.conf 739endif 740 741ifeq ($(KBUILD_EXTMOD),) 742# Objects we will link into vmlinux / subdirs we need to visit 743core-y := 744drivers-y := 745libs-y := lib/ 746endif # KBUILD_EXTMOD 747 748# The all: target is the default when no target is given on the 749# command line. 750# This allow a user to issue only 'make' to build a kernel including modules 751# Defaults to vmlinux, but the arch makefile usually adds further targets 752all: vmlinux 753 754CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 755ifdef CONFIG_CC_IS_GCC 756CFLAGS_GCOV += -fno-tree-loop-im 757endif 758export CFLAGS_GCOV 759 760# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 761ifdef CONFIG_FUNCTION_TRACER 762 CC_FLAGS_FTRACE := -pg 763endif 764 765include $(srctree)/arch/$(SRCARCH)/Makefile 766 767ifdef need-config 768ifdef may-sync-config 769# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 770# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 771# because some architectures define CROSS_COMPILE there. 772include include/config/auto.conf.cmd 773 774$(KCONFIG_CONFIG): 775 @echo >&2 '***' 776 @echo >&2 '*** Configuration file "$@" not found!' 777 @echo >&2 '***' 778 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 779 @echo >&2 '*** "make menuconfig" or "make xconfig").' 780 @echo >&2 '***' 781 @/bin/false 782 783# The actual configuration files used during the build are stored in 784# include/generated/ and include/config/. Update them if .config is newer than 785# include/config/auto.conf (which mirrors .config). 786# 787# This exploits the 'multi-target pattern rule' trick. 788# The syncconfig should be executed only once to make all the targets. 789# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 790# 791# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 792# so you cannot notice that Kconfig is waiting for the user input. 793%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 794 $(Q)$(kecho) " SYNC $@" 795 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 796else # !may-sync-config 797# External modules and some install targets need include/generated/autoconf.h 798# and include/config/auto.conf but do not care if they are up-to-date. 799# Use auto.conf to trigger the test 800PHONY += include/config/auto.conf 801 802include/config/auto.conf: 803 @test -e include/generated/autoconf.h -a -e $@ || ( \ 804 echo >&2; \ 805 echo >&2 " ERROR: Kernel configuration is invalid."; \ 806 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 807 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 808 echo >&2 ; \ 809 /bin/false) 810 811endif # may-sync-config 812endif # need-config 813 814KBUILD_CFLAGS += -fno-delete-null-pointer-checks 815KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 816KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 817KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 818KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 819 820ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 821KBUILD_CFLAGS += -O2 822KBUILD_RUSTFLAGS += -Copt-level=2 823else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 824KBUILD_CFLAGS += -Os 825KBUILD_RUSTFLAGS += -Copt-level=s 826endif 827 828# Always set `debug-assertions` and `overflow-checks` because their default 829# depends on `opt-level` and `debug-assertions`, respectively. 830KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 831KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 832 833# Tell gcc to never replace conditional load with a non-conditional one 834ifdef CONFIG_CC_IS_GCC 835# gcc-10 renamed --param=allow-store-data-races=0 to 836# -fno-allow-store-data-races. 837KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 838KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 839endif 840 841ifdef CONFIG_READABLE_ASM 842# Disable optimizations that make assembler listings hard to read. 843# reorder blocks reorders the control in the function 844# ipa clone creates specialized cloned functions 845# partial inlining inlines only parts of functions 846KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 847endif 848 849ifneq ($(CONFIG_FRAME_WARN),0) 850KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 851endif 852 853stackp-flags-y := -fno-stack-protector 854stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 855stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 856 857KBUILD_CFLAGS += $(stackp-flags-y) 858 859KBUILD_CPPFLAGS-$(CONFIG_WERROR) += -Werror 860KBUILD_CPPFLAGS += $(KBUILD_CPPFLAGS-y) 861KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUNDS) += -Wno-array-bounds 862 863KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings 864KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) 865 866ifdef CONFIG_CC_IS_CLANG 867# The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable. 868KBUILD_CFLAGS += -Wno-gnu 869else 870 871# gcc inanely warns about local variables called 'main' 872KBUILD_CFLAGS += -Wno-main 873endif 874 875# These warnings generated too much noise in a regular build. 876# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 877KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 878KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 879 880# These result in bogus false positives 881KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer) 882 883ifdef CONFIG_FRAME_POINTER 884KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 885KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 886else 887# Some targets (ARM with Thumb2, for example), can't be built with frame 888# pointers. For those, we don't have FUNCTION_TRACER automatically 889# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 890# incompatible with -fomit-frame-pointer with current GCC, so we don't use 891# -fomit-frame-pointer with FUNCTION_TRACER. 892# In the Rust target specification, "frame-pointer" is set explicitly 893# to "may-omit". 894ifndef CONFIG_FUNCTION_TRACER 895KBUILD_CFLAGS += -fomit-frame-pointer 896endif 897endif 898 899# Initialize all stack variables with a 0xAA pattern. 900ifdef CONFIG_INIT_STACK_ALL_PATTERN 901KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 902endif 903 904# Initialize all stack variables with a zero value. 905ifdef CONFIG_INIT_STACK_ALL_ZERO 906KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 907ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 908# https://github.com/llvm/llvm-project/issues/44842 909CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 910export CC_AUTO_VAR_INIT_ZERO_ENABLER 911KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 912endif 913endif 914 915# While VLAs have been removed, GCC produces unreachable stack probes 916# for the randomize_kstack_offset feature. Disable it for all compilers. 917KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 918 919# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 920ifdef CONFIG_ZERO_CALL_USED_REGS 921KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 922endif 923 924ifdef CONFIG_FUNCTION_TRACER 925ifdef CONFIG_FTRACE_MCOUNT_USE_CC 926 CC_FLAGS_FTRACE += -mrecord-mcount 927 ifdef CONFIG_HAVE_NOP_MCOUNT 928 ifeq ($(call cc-option-yn, -mnop-mcount),y) 929 CC_FLAGS_FTRACE += -mnop-mcount 930 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 931 endif 932 endif 933endif 934ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 935 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 936 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 937 endif 938endif 939ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 940 ifdef CONFIG_HAVE_C_RECORDMCOUNT 941 BUILD_C_RECORDMCOUNT := y 942 export BUILD_C_RECORDMCOUNT 943 endif 944endif 945ifdef CONFIG_HAVE_FENTRY 946 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 947 ifeq ($(call cc-option-yn, -mfentry),y) 948 CC_FLAGS_FTRACE += -mfentry 949 CC_FLAGS_USING += -DCC_USING_FENTRY 950 endif 951endif 952export CC_FLAGS_FTRACE 953KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 954KBUILD_AFLAGS += $(CC_FLAGS_USING) 955endif 956 957# We trigger additional mismatches with less inlining 958ifdef CONFIG_DEBUG_SECTION_MISMATCH 959KBUILD_CFLAGS += -fno-inline-functions-called-once 960endif 961 962# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 963ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 964KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 965KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 966LDFLAGS_vmlinux += --gc-sections 967endif 968 969ifdef CONFIG_SHADOW_CALL_STACK 970ifndef CONFIG_DYNAMIC_SCS 971CC_FLAGS_SCS := -fsanitize=shadow-call-stack 972KBUILD_CFLAGS += $(CC_FLAGS_SCS) 973endif 974export CC_FLAGS_SCS 975endif 976 977ifdef CONFIG_LTO_CLANG 978ifdef CONFIG_LTO_CLANG_THIN 979CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 980KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache 981else 982CC_FLAGS_LTO := -flto 983endif 984CC_FLAGS_LTO += -fvisibility=hidden 985 986# Limit inlining across translation units to reduce binary size 987KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 988 989# Check for frame size exceeding threshold during prolog/epilog insertion 990# when using lld < 13.0.0. 991ifneq ($(CONFIG_FRAME_WARN),0) 992ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 130000),y) 993KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) 994endif 995endif 996endif 997 998ifdef CONFIG_LTO 999KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 1000KBUILD_AFLAGS += -fno-lto 1001export CC_FLAGS_LTO 1002endif 1003 1004ifdef CONFIG_CFI_CLANG 1005CC_FLAGS_CFI := -fsanitize=kcfi 1006KBUILD_CFLAGS += $(CC_FLAGS_CFI) 1007export CC_FLAGS_CFI 1008endif 1009 1010ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 1011KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 1012endif 1013 1014# arch Makefile may override CC so keep this after arch Makefile is included 1015NOSTDINC_FLAGS += -nostdinc 1016 1017# warn about C99 declaration after statement 1018KBUILD_CFLAGS += -Wdeclaration-after-statement 1019 1020# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 1021KBUILD_CFLAGS += -Wvla 1022 1023# disable pointer signed / unsigned warnings in gcc 4.0 1024KBUILD_CFLAGS += -Wno-pointer-sign 1025 1026# In order to make sure new function cast mismatches are not introduced 1027# in the kernel (to avoid tripping CFI checking), the kernel should be 1028# globally built with -Wcast-function-type. 1029KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type) 1030 1031# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 1032# the kernel uses only C99 flexible arrays for dynamically sized trailing 1033# arrays. Enforce this for everything that may examine structure sizes and 1034# perform bounds checking. 1035KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 1036 1037# disable stringop warnings in gcc 8+ 1038KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 1039 1040# We'll want to enable this eventually, but it's not going away for 5.7 at least 1041KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 1042 1043# Another good warning that we'll want to enable eventually 1044KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 1045 1046# Enabled with W=2, disabled by default as noisy 1047ifdef CONFIG_CC_IS_GCC 1048KBUILD_CFLAGS += -Wno-maybe-uninitialized 1049endif 1050 1051# The allocators already balk at large sizes, so silence the compiler 1052# warnings for bounds checks involving those possible values. While 1053# -Wno-alloc-size-larger-than would normally be used here, earlier versions 1054# of gcc (<9.1) weirdly don't handle the option correctly when _other_ 1055# warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX 1056# doesn't work (as it is documented to), silently resolving to "0" prior to 1057# version 9.1 (and producing an error more recently). Numeric values larger 1058# than PTRDIFF_MAX also don't work prior to version 9.1, which are silently 1059# ignored, continuing to default to PTRDIFF_MAX. So, left with no other 1060# choice, we must perform a versioned check to disable this warning. 1061# https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au 1062KBUILD_CFLAGS-$(call gcc-min-version, 90100) += -Wno-alloc-size-larger-than 1063KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH) 1064 1065# disable invalid "can't wrap" optimizations for signed / pointers 1066KBUILD_CFLAGS += -fno-strict-overflow 1067 1068# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1069KBUILD_CFLAGS += -fno-stack-check 1070 1071# conserve stack if available 1072ifdef CONFIG_CC_IS_GCC 1073KBUILD_CFLAGS += -fconserve-stack 1074endif 1075 1076# Prohibit date/time macros, which would make the build non-deterministic 1077KBUILD_CFLAGS += -Werror=date-time 1078 1079# enforce correct pointer usage 1080KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 1081 1082# Require designated initializers for all marked structures 1083KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 1084 1085# change __FILE__ to the relative path from the srctree 1086KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1087 1088# include additional Makefiles when needed 1089include-y := scripts/Makefile.extrawarn 1090include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1091include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1092include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1093include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1094include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1095include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1096include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1097include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1098 1099include $(addprefix $(srctree)/, $(include-y)) 1100 1101# scripts/Makefile.gcc-plugins is intentionally included last. 1102# Do not add $(call cc-option,...) below this line. When you build the kernel 1103# from the clean source tree, the GCC plugins do not exist at this point. 1104 1105# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1106KBUILD_CPPFLAGS += $(KCPPFLAGS) 1107KBUILD_AFLAGS += $(KAFLAGS) 1108KBUILD_CFLAGS += $(KCFLAGS) 1109KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1110 1111KBUILD_LDFLAGS_MODULE += --build-id=sha1 1112LDFLAGS_vmlinux += --build-id=sha1 1113 1114KBUILD_LDFLAGS += -z noexecstack 1115ifeq ($(CONFIG_LD_IS_BFD),y) 1116KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1117endif 1118 1119ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1120LDFLAGS_vmlinux += -X 1121endif 1122 1123ifeq ($(CONFIG_RELR),y) 1124# ld.lld before 15 did not support -z pack-relative-relocs. 1125LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1126endif 1127 1128# We never want expected sections to be placed heuristically by the 1129# linker. All sections should be explicitly named in the linker script. 1130ifdef CONFIG_LD_ORPHAN_WARN 1131LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1132endif 1133 1134# Align the bit size of userspace programs with the kernel 1135KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1136KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1137 1138# make the checker run with the right architecture 1139CHECKFLAGS += --arch=$(ARCH) 1140 1141# insure the checker run with the right endianness 1142CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1143 1144# the checker needs the correct machine size 1145CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1146 1147# Default kernel image to build when no specific target is given. 1148# KBUILD_IMAGE may be overruled on the command line or 1149# set in the environment 1150# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1151# this default value 1152export KBUILD_IMAGE ?= vmlinux 1153 1154# 1155# INSTALL_PATH specifies where to place the updated kernel and system map 1156# images. Default is /boot, but you can set it to other values 1157export INSTALL_PATH ?= /boot 1158 1159# 1160# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1161# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1162# an argument if needed. Otherwise it defaults to the kernel install path 1163# 1164export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1165 1166# 1167# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1168# relocations required by build roots. This is not defined in the 1169# makefile but the argument can be passed to make if needed. 1170# 1171 1172MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1173export MODLIB 1174 1175PHONY += prepare0 1176 1177export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1178export MODORDER := $(extmod_prefix)modules.order 1179export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1180 1181ifeq ($(KBUILD_EXTMOD),) 1182 1183build-dir := . 1184clean-dirs := $(sort . Documentation \ 1185 $(patsubst %/,%,$(filter %/, $(core-) \ 1186 $(drivers-) $(libs-)))) 1187 1188export ARCH_CORE := $(core-y) 1189export ARCH_LIB := $(filter %/, $(libs-y)) 1190export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1191# Externally visible symbols (used by link-vmlinux.sh) 1192 1193KBUILD_VMLINUX_OBJS := ./built-in.a 1194ifdef CONFIG_MODULES 1195KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1196KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1197else 1198KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1199endif 1200 1201export KBUILD_VMLINUX_LIBS 1202export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1203 1204ifdef CONFIG_TRIM_UNUSED_KSYMS 1205# For the kernel to actually contain only the needed exported symbols, 1206# we have to build modules as well to determine what those symbols are. 1207KBUILD_MODULES := 1 1208endif 1209 1210# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1211quiet_cmd_ar_vmlinux.a = AR $@ 1212 cmd_ar_vmlinux.a = \ 1213 rm -f $@; \ 1214 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1215 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1216 1217targets += vmlinux.a 1218vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1219 $(call if_changed,ar_vmlinux.a) 1220 1221PHONY += vmlinux_o 1222vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1223 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1224 1225vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1226 @: 1227 1228PHONY += vmlinux 1229# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1230# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1231# unrelated; the decompressors just happen to have the same base name, 1232# arch/*/boot/compressed/vmlinux. 1233# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1234# 1235# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1236# https://savannah.gnu.org/bugs/?61463 1237# For Make > 4.4, the following simple code will work: 1238# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1239vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1240vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1241vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1242 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1243 1244# The actual objects are generated when descending, 1245# make sure no implicit rule kicks in 1246$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1247 1248ifeq ($(origin KERNELRELEASE),file) 1249filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1250else 1251filechk_kernel.release = echo $(KERNELRELEASE) 1252endif 1253 1254# Store (new) KERNELRELEASE string in include/config/kernel.release 1255include/config/kernel.release: FORCE 1256 $(call filechk,kernel.release) 1257 1258# Additional helpers built in scripts/ 1259# Carefully list dependencies so we do not try to build scripts twice 1260# in parallel 1261PHONY += scripts 1262scripts: scripts_basic scripts_dtc 1263 $(Q)$(MAKE) $(build)=$(@) 1264 1265# Things we need to do before we recursively start building the kernel 1266# or the modules are listed in "prepare". 1267# A multi level approach is used. prepareN is processed before prepareN-1. 1268# archprepare is used in arch Makefiles and when processed asm symlink, 1269# version.h and scripts_basic is processed / created. 1270 1271PHONY += prepare archprepare 1272 1273archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1274 asm-generic $(version_h) include/generated/utsrelease.h \ 1275 include/generated/compile.h include/generated/autoconf.h remove-stale-files 1276 1277prepare0: archprepare 1278 $(Q)$(MAKE) $(build)=scripts/mod 1279 $(Q)$(MAKE) $(build)=. prepare 1280 1281# All the preparing.. 1282prepare: prepare0 1283ifdef CONFIG_RUST 1284 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh -v 1285 $(Q)$(MAKE) $(build)=rust 1286endif 1287 1288PHONY += remove-stale-files 1289remove-stale-files: 1290 $(Q)$(srctree)/scripts/remove-stale-files 1291 1292# Support for using generic headers in asm-generic 1293asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1294 1295PHONY += asm-generic uapi-asm-generic 1296asm-generic: uapi-asm-generic 1297 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1298 generic=include/asm-generic 1299uapi-asm-generic: 1300 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1301 generic=include/uapi/asm-generic 1302 1303# Generate some files 1304# --------------------------------------------------------------------------- 1305 1306# KERNELRELEASE can change from a few different places, meaning version.h 1307# needs to be updated, so this check is forced on all builds 1308 1309uts_len := 64 1310define filechk_utsrelease.h 1311 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1312 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1313 exit 1; \ 1314 fi; \ 1315 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1316endef 1317 1318define filechk_version.h 1319 if [ $(SUBLEVEL) -gt 255 ]; then \ 1320 echo \#define LINUX_VERSION_CODE $(shell \ 1321 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1322 else \ 1323 echo \#define LINUX_VERSION_CODE $(shell \ 1324 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1325 fi; \ 1326 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1327 ((c) > 255 ? 255 : (c)))'; \ 1328 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1329 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1330 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1331endef 1332 1333$(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1334$(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0) 1335$(version_h): FORCE 1336 $(call filechk,version.h) 1337 1338include/generated/utsrelease.h: include/config/kernel.release FORCE 1339 $(call filechk,utsrelease.h) 1340 1341filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1342 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1343 1344include/generated/compile.h: FORCE 1345 $(call filechk,compile.h) 1346 1347PHONY += headerdep 1348headerdep: 1349 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1350 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1351 1352# --------------------------------------------------------------------------- 1353# Kernel headers 1354 1355#Default location for installed headers 1356export INSTALL_HDR_PATH = $(objtree)/usr 1357 1358quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1359 cmd_headers_install = \ 1360 mkdir -p $(INSTALL_HDR_PATH); \ 1361 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1362 usr/include $(INSTALL_HDR_PATH) 1363 1364PHONY += headers_install 1365headers_install: headers 1366 $(call cmd,headers_install) 1367 1368PHONY += archheaders archscripts 1369 1370hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1371 1372PHONY += headers 1373headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1374 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML)) 1375 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1376 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1377 1378ifdef CONFIG_HEADERS_INSTALL 1379prepare: headers 1380endif 1381 1382PHONY += scripts_unifdef 1383scripts_unifdef: scripts_basic 1384 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1385 1386# --------------------------------------------------------------------------- 1387# Install 1388 1389# Many distributions have the custom install script, /sbin/installkernel. 1390# If DKMS is installed, 'make install' will eventually recurse back 1391# to this Makefile to build and install external modules. 1392# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1393 1394quiet_cmd_install = INSTALL $(INSTALL_PATH) 1395 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1396 1397# --------------------------------------------------------------------------- 1398# Tools 1399 1400ifdef CONFIG_OBJTOOL 1401prepare: tools/objtool 1402endif 1403 1404ifdef CONFIG_BPF 1405ifdef CONFIG_DEBUG_INFO_BTF 1406prepare: tools/bpf/resolve_btfids 1407endif 1408endif 1409 1410PHONY += resolve_btfids_clean 1411 1412resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1413 1414# tools/bpf/resolve_btfids directory might not exist 1415# in output directory, skip its clean in that case 1416resolve_btfids_clean: 1417ifneq ($(wildcard $(resolve_btfids_O)),) 1418 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1419endif 1420 1421# Clear a bunch of variables before executing the submake 1422ifeq ($(quiet),silent_) 1423tools_silent=s 1424endif 1425 1426tools/: FORCE 1427 $(Q)mkdir -p $(objtree)/tools 1428 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1429 1430tools/%: FORCE 1431 $(Q)mkdir -p $(objtree)/tools 1432 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1433 1434# --------------------------------------------------------------------------- 1435# Kernel selftest 1436 1437PHONY += kselftest 1438kselftest: headers 1439 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1440 1441kselftest-%: headers FORCE 1442 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1443 1444PHONY += kselftest-merge 1445kselftest-merge: 1446 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1447 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1448 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1449 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1450 1451# --------------------------------------------------------------------------- 1452# Devicetree files 1453 1454ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1455dtstree := arch/$(SRCARCH)/boot/dts 1456endif 1457 1458ifneq ($(dtstree),) 1459 1460%.dtb: dtbs_prepare 1461 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1462 1463%.dtbo: dtbs_prepare 1464 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1465 1466PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1467dtbs: dtbs_prepare 1468 $(Q)$(MAKE) $(build)=$(dtstree) 1469 1470# include/config/kernel.release is actually needed when installing DTBs because 1471# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1472# dtbs_install depend on it as dtbs_install may run as root. 1473dtbs_prepare: include/config/kernel.release scripts_dtc 1474 1475ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1476export CHECK_DTBS=y 1477endif 1478 1479ifneq ($(CHECK_DTBS),) 1480dtbs_prepare: dt_binding_check 1481endif 1482 1483dtbs_check: dtbs 1484 1485dtbs_install: 1486 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1487 1488ifdef CONFIG_OF_EARLY_FLATTREE 1489all: dtbs 1490endif 1491 1492endif 1493 1494PHONY += scripts_dtc 1495scripts_dtc: scripts_basic 1496 $(Q)$(MAKE) $(build)=scripts/dtc 1497 1498ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1499export CHECK_DT_BINDING=y 1500endif 1501 1502PHONY += dt_binding_check 1503dt_binding_check: scripts_dtc 1504 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1505 1506PHONY += dt_compatible_check 1507dt_compatible_check: dt_binding_check 1508 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1509 1510# --------------------------------------------------------------------------- 1511# Modules 1512 1513ifdef CONFIG_MODULES 1514 1515# By default, build modules as well 1516 1517all: modules 1518 1519# When we're building modules with modversions, we need to consider 1520# the built-in objects during the descend as well, in order to 1521# make sure the checksums are up to date before we record them. 1522ifdef CONFIG_MODVERSIONS 1523 KBUILD_BUILTIN := 1 1524endif 1525 1526# Build modules 1527# 1528 1529# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1530# is an exception. 1531ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1532KBUILD_BUILTIN := 1 1533modules: vmlinux 1534endif 1535 1536modules: modules_prepare 1537 1538# Target to prepare building external modules 1539modules_prepare: prepare 1540 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1541 1542export modules_sign_only := 1543 1544ifeq ($(CONFIG_MODULE_SIG),y) 1545PHONY += modules_sign 1546modules_sign: modules_install 1547 @: 1548 1549# modules_sign is a subset of modules_install. 1550# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1551ifeq ($(filter modules_install,$(MAKECMDGOALS)),) 1552modules_sign_only := y 1553endif 1554endif 1555 1556endif # CONFIG_MODULES 1557 1558modinst_pre := 1559ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 1560modinst_pre := __modinst_pre 1561endif 1562 1563modules_install: $(modinst_pre) 1564PHONY += __modinst_pre 1565__modinst_pre: 1566 @rm -rf $(MODLIB)/kernel 1567 @rm -f $(MODLIB)/source 1568 @mkdir -p $(MODLIB) 1569ifdef CONFIG_MODULES 1570 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1571 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1572 rm -f $(MODLIB)/build ; \ 1573 ln -s $(CURDIR) $(MODLIB)/build ; \ 1574 fi 1575 @sed 's:^\(.*\)\.o$$:kernel/\1.ko:' modules.order > $(MODLIB)/modules.order 1576endif 1577 @cp -f modules.builtin $(MODLIB)/ 1578 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1579 1580### 1581# Cleaning is done on three levels. 1582# make clean Delete most generated files 1583# Leave enough to build external modules 1584# make mrproper Delete the current configuration, and all generated files 1585# make distclean Remove editor backup files, patch leftover files and the like 1586 1587# Directories & files removed with 'make clean' 1588CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ 1589 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1590 compile_commands.json .thinlto-cache rust/test rust/doc \ 1591 rust-project.json .vmlinux.objs .vmlinux.export.c 1592 1593# Directories & files removed with 'make mrproper' 1594MRPROPER_FILES += include/config include/generated \ 1595 arch/$(SRCARCH)/include/generated .objdiff \ 1596 debian snap tar-install \ 1597 .config .config.old .version \ 1598 Module.symvers \ 1599 certs/signing_key.pem \ 1600 certs/x509.genkey \ 1601 vmlinux-gdb.py \ 1602 *.spec rpmbuild \ 1603 rust/libmacros.so 1604 1605# clean - Delete most, but leave enough to build external modules 1606# 1607clean: rm-files := $(CLEAN_FILES) 1608 1609PHONY += archclean vmlinuxclean 1610 1611vmlinuxclean: 1612 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1613 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1614 1615clean: archclean vmlinuxclean resolve_btfids_clean 1616 1617# mrproper - Delete all generated files, including .config 1618# 1619mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1620mrproper-dirs := $(addprefix _mrproper_,scripts) 1621 1622PHONY += $(mrproper-dirs) mrproper 1623$(mrproper-dirs): 1624 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1625 1626mrproper: clean $(mrproper-dirs) 1627 $(call cmd,rmfiles) 1628 @find . $(RCS_FIND_IGNORE) \ 1629 \( -name '*.rmeta' \) \ 1630 -type f -print | xargs rm -f 1631 1632# distclean 1633# 1634PHONY += distclean 1635 1636distclean: mrproper 1637 @find . $(RCS_FIND_IGNORE) \ 1638 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1639 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1640 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1641 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1642 -type f -print | xargs rm -f 1643 1644 1645# Packaging of the kernel to various formats 1646# --------------------------------------------------------------------------- 1647 1648%src-pkg: FORCE 1649 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1650%pkg: include/config/kernel.release FORCE 1651 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1652 1653# Brief documentation of the typical targets used 1654# --------------------------------------------------------------------------- 1655 1656boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1657boards := $(sort $(notdir $(boards))) 1658board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1659board-dirs := $(sort $(notdir $(board-dirs:/=))) 1660 1661PHONY += help 1662help: 1663 @echo 'Cleaning targets:' 1664 @echo ' clean - Remove most generated files but keep the config and' 1665 @echo ' enough build support to build external modules' 1666 @echo ' mrproper - Remove all generated files + config + various backup files' 1667 @echo ' distclean - mrproper + remove editor backup and patch files' 1668 @echo '' 1669 @echo 'Configuration targets:' 1670 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1671 @echo '' 1672 @echo 'Other generic targets:' 1673 @echo ' all - Build all targets marked with [*]' 1674 @echo '* vmlinux - Build the bare kernel' 1675 @echo '* modules - Build all modules' 1676 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1677 @echo ' dir/ - Build all files in dir and below' 1678 @echo ' dir/file.[ois] - Build specified target only' 1679 @echo ' dir/file.ll - Build the LLVM assembly file' 1680 @echo ' (requires compiler support for LLVM assembly generation)' 1681 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1682 @echo ' (requires a recent binutils and recent build (System.map))' 1683 @echo ' dir/file.ko - Build module including final link' 1684 @echo ' modules_prepare - Set up for building external modules' 1685 @echo ' tags/TAGS - Generate tags file for editors' 1686 @echo ' cscope - Generate cscope index' 1687 @echo ' gtags - Generate GNU GLOBAL index' 1688 @echo ' kernelrelease - Output the release version string (use with make -s)' 1689 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1690 @echo ' image_name - Output the image name (use with make -s)' 1691 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1692 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1693 echo '' 1694 @echo 'Static analysers:' 1695 @echo ' checkstack - Generate a list of stack hogs' 1696 @echo ' versioncheck - Sanity check on version.h usage' 1697 @echo ' includecheck - Check for duplicate included header files' 1698 @echo ' export_report - List the usages of all exported symbols' 1699 @echo ' headerdep - Detect inclusion cycles in headers' 1700 @echo ' coccicheck - Check with Coccinelle' 1701 @echo ' clang-analyzer - Check with clang static analyzer' 1702 @echo ' clang-tidy - Check with clang-tidy' 1703 @echo '' 1704 @echo 'Tools:' 1705 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1706 @echo '' 1707 @echo 'Kernel selftest:' 1708 @echo ' kselftest - Build and run kernel selftest' 1709 @echo ' Build, install, and boot kernel before' 1710 @echo ' running kselftest on it' 1711 @echo ' Run as root for full coverage' 1712 @echo ' kselftest-all - Build kernel selftest' 1713 @echo ' kselftest-install - Build and install kernel selftest' 1714 @echo ' kselftest-clean - Remove all generated kselftest files' 1715 @echo ' kselftest-merge - Merge all the config dependencies of' 1716 @echo ' kselftest to existing .config.' 1717 @echo '' 1718 @echo 'Rust targets:' 1719 @echo ' rustavailable - Checks whether the Rust toolchain is' 1720 @echo ' available and, if not, explains why.' 1721 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1722 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1723 @echo ' is formatted, printing a diff otherwise.' 1724 @echo ' rustdoc - Generate Rust documentation' 1725 @echo ' (requires kernel .config)' 1726 @echo ' rusttest - Runs the Rust tests' 1727 @echo ' (requires kernel .config; downloads external repos)' 1728 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1729 @echo ' (requires kernel .config)' 1730 @echo ' dir/file.[os] - Build specified target only' 1731 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1732 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1733 @echo ' The output is not intended to be compilable.' 1734 @echo ' dir/file.ll - Build the LLVM assembly file' 1735 @echo '' 1736 @$(if $(dtstree), \ 1737 echo 'Devicetree:'; \ 1738 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1739 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1740 echo ' dt_binding_check - Validate device tree binding documents'; \ 1741 echo ' dtbs_check - Validate device tree source files';\ 1742 echo '') 1743 1744 @echo 'Userspace tools targets:' 1745 @echo ' use "make tools/help"' 1746 @echo ' or "cd tools; make help"' 1747 @echo '' 1748 @echo 'Kernel packaging:' 1749 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1750 @echo '' 1751 @echo 'Documentation targets:' 1752 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1753 @echo '' 1754 @echo 'Architecture specific targets ($(SRCARCH)):' 1755 @$(or $(archhelp),\ 1756 echo ' No architecture specific help defined for $(SRCARCH)') 1757 @echo '' 1758 @$(if $(boards), \ 1759 $(foreach b, $(boards), \ 1760 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1761 echo '') 1762 @$(if $(board-dirs), \ 1763 $(foreach b, $(board-dirs), \ 1764 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1765 printf " %-16s - Show all of the above\\n" help-boards; \ 1766 echo '') 1767 1768 @echo ' make V=n [targets] 1: verbose build' 1769 @echo ' 2: give reason for rebuild of target' 1770 @echo ' V=1 and V=2 can be combined with V=12' 1771 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1772 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1773 @echo ' (sparse by default)' 1774 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1775 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1776 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1777 @echo ' 1: warnings which may be relevant and do not occur too often' 1778 @echo ' 2: warnings which occur quite often but may still be relevant' 1779 @echo ' 3: more obscure warnings, can most likely be ignored' 1780 @echo ' e: warnings are being treated as errors' 1781 @echo ' Multiple levels can be combined with W=12 or W=123' 1782 @$(if $(dtstree), \ 1783 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1784 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1785 ) 1786 @echo '' 1787 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1788 @echo 'For further info see the ./README file' 1789 1790 1791help-board-dirs := $(addprefix help-,$(board-dirs)) 1792 1793help-boards: $(help-board-dirs) 1794 1795boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1796 1797$(help-board-dirs): help-%: 1798 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1799 @$(if $(boards-per-dir), \ 1800 $(foreach b, $(boards-per-dir), \ 1801 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1802 echo '') 1803 1804 1805# Documentation targets 1806# --------------------------------------------------------------------------- 1807DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1808 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs 1809PHONY += $(DOC_TARGETS) 1810$(DOC_TARGETS): 1811 $(Q)$(MAKE) $(build)=Documentation $@ 1812 1813 1814# Rust targets 1815# --------------------------------------------------------------------------- 1816 1817# "Is Rust available?" target 1818PHONY += rustavailable 1819rustavailable: 1820 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh -v && echo "Rust is available!" 1821 1822# Documentation target 1823# 1824# Using the singular to avoid running afoul of `no-dot-config-targets`. 1825PHONY += rustdoc 1826rustdoc: prepare 1827 $(Q)$(MAKE) $(build)=rust $@ 1828 1829# Testing target 1830PHONY += rusttest 1831rusttest: prepare 1832 $(Q)$(MAKE) $(build)=rust $@ 1833 1834# Formatting targets 1835PHONY += rustfmt rustfmtcheck 1836 1837# We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream. 1838# 1839# We match using absolute paths since `find` does not resolve them 1840# when matching, which is a problem when e.g. `srctree` is `..`. 1841# We `grep` afterwards in order to remove the directory entry itself. 1842rustfmt: 1843 $(Q)find $(abs_srctree) -type f -name '*.rs' \ 1844 -o -path $(abs_srctree)/rust/alloc -prune \ 1845 -o -path $(abs_objtree)/rust/test -prune \ 1846 | grep -Fv $(abs_srctree)/rust/alloc \ 1847 | grep -Fv $(abs_objtree)/rust/test \ 1848 | grep -Fv generated \ 1849 | xargs $(RUSTFMT) $(rustfmt_flags) 1850 1851rustfmtcheck: rustfmt_flags = --check 1852rustfmtcheck: rustfmt 1853 1854# IDE support targets 1855PHONY += rust-analyzer 1856rust-analyzer: 1857 $(Q)$(MAKE) $(build)=rust $@ 1858 1859# Misc 1860# --------------------------------------------------------------------------- 1861 1862PHONY += misc-check 1863misc-check: 1864 $(Q)$(srctree)/scripts/misc-check 1865 1866all: misc-check 1867 1868PHONY += scripts_gdb 1869scripts_gdb: prepare0 1870 $(Q)$(MAKE) $(build)=scripts/gdb 1871 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1872 1873ifdef CONFIG_GDB_SCRIPTS 1874all: scripts_gdb 1875endif 1876 1877else # KBUILD_EXTMOD 1878 1879filechk_kernel.release = echo $(KERNELRELEASE) 1880 1881### 1882# External module support. 1883# When building external modules the kernel used as basis is considered 1884# read-only, and no consistency checks are made and the make 1885# system is not used on the basis kernel. If updates are required 1886# in the basis kernel ordinary make commands (without M=...) must be used. 1887 1888# We are always building only modules. 1889KBUILD_BUILTIN := 1890KBUILD_MODULES := 1 1891 1892build-dir := $(KBUILD_EXTMOD) 1893 1894compile_commands.json: $(extmod_prefix)compile_commands.json 1895PHONY += compile_commands.json 1896 1897clean-dirs := $(KBUILD_EXTMOD) 1898clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1899 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1900 1901PHONY += prepare 1902# now expand this into a simple variable to reduce the cost of shell evaluations 1903prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1904prepare: 1905 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1906 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1907 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1908 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1909 fi 1910 1911PHONY += help 1912help: 1913 @echo ' Building external modules.' 1914 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1915 @echo '' 1916 @echo ' modules - default target, build the module(s)' 1917 @echo ' modules_install - install the module' 1918 @echo ' clean - remove generated files in module directory only' 1919 @echo '' 1920 1921__external_modules_error: 1922 @echo >&2 '***' 1923 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 1924 @echo >&2 '*** You cannot build or install external modules.' 1925 @echo >&2 '***' 1926 @false 1927 1928endif # KBUILD_EXTMOD 1929 1930# --------------------------------------------------------------------------- 1931# Modules 1932 1933PHONY += modules modules_install modules_prepare 1934 1935ifdef CONFIG_MODULES 1936 1937$(MODORDER): $(build-dir) 1938 @: 1939 1940# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1941# This is solely useful to speed up test compiles. 1942modules: modpost 1943ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1944 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1945endif 1946 1947PHONY += modules_check 1948modules_check: $(MODORDER) 1949 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1950 1951quiet_cmd_depmod = DEPMOD $(MODLIB) 1952 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1953 $(KERNELRELEASE) 1954 1955modules_install: 1956 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1957 $(call cmd,depmod) 1958 1959else # CONFIG_MODULES 1960 1961# Modules not configured 1962# --------------------------------------------------------------------------- 1963 1964PHONY += __external_modules_error 1965 1966modules modules_install: __external_modules_error 1967 @: 1968 1969KBUILD_MODULES := 1970 1971endif # CONFIG_MODULES 1972 1973PHONY += modpost 1974modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 1975 $(if $(KBUILD_MODULES), modules_check) 1976 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1977 1978# Single targets 1979# --------------------------------------------------------------------------- 1980# To build individual files in subdirectories, you can do like this: 1981# 1982# make foo/bar/baz.s 1983# 1984# The supported suffixes for single-target are listed in 'single-targets' 1985# 1986# To build only under specific subdirectories, you can do like this: 1987# 1988# make foo/bar/baz/ 1989 1990ifdef single-build 1991 1992# .ko is special because modpost is needed 1993single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1994single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 1995 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 1996 1997$(single-ko): single_modules 1998 @: 1999$(single-no-ko): $(build-dir) 2000 @: 2001 2002# Remove MODORDER when done because it is not the real one. 2003PHONY += single_modules 2004single_modules: $(single-no-ko) modules_prepare 2005 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER) 2006 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2007ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2008 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2009endif 2010 $(Q)rm -f $(MODORDER) 2011 2012single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 2013 2014KBUILD_MODULES := 1 2015 2016endif 2017 2018# Preset locale variables to speed up the build process. Limit locale 2019# tweaks to this spot to avoid wrong language settings when running 2020# make menuconfig etc. 2021# Error messages still appears in the original language 2022PHONY += $(build-dir) 2023$(build-dir): prepare 2024 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 2025 2026clean-dirs := $(addprefix _clean_, $(clean-dirs)) 2027PHONY += $(clean-dirs) clean 2028$(clean-dirs): 2029 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 2030 2031clean: $(clean-dirs) 2032 $(call cmd,rmfiles) 2033 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 2034 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 2035 -o -name '*.ko.*' \ 2036 -o -name '*.dtb' -o -name '*.dtbo' \ 2037 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 2038 -o -name '*.dt.yaml' \ 2039 -o -name '*.dwo' -o -name '*.lst' \ 2040 -o -name '*.su' -o -name '*.mod' \ 2041 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 2042 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 2043 -o -name '*.asn1.[ch]' \ 2044 -o -name '*.symtypes' -o -name 'modules.order' \ 2045 -o -name '*.c.[012]*.*' \ 2046 -o -name '*.ll' \ 2047 -o -name '*.gcno' \ 2048 -o -name '*.*.symversions' \) -type f -print \ 2049 -o -name '.tmp_*' -print \ 2050 | xargs rm -rf 2051 2052# Generate tags for editors 2053# --------------------------------------------------------------------------- 2054quiet_cmd_tags = GEN $@ 2055 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 2056 2057tags TAGS cscope gtags: FORCE 2058 $(call cmd,tags) 2059 2060# Script to generate missing namespace dependencies 2061# --------------------------------------------------------------------------- 2062 2063PHONY += nsdeps 2064nsdeps: export KBUILD_NSDEPS=1 2065nsdeps: modules 2066 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 2067 2068# Clang Tooling 2069# --------------------------------------------------------------------------- 2070 2071quiet_cmd_gen_compile_commands = GEN $@ 2072 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2073 2074$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 2075 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2076 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 2077 $(call if_changed,gen_compile_commands) 2078 2079targets += $(extmod_prefix)compile_commands.json 2080 2081PHONY += clang-tidy clang-analyzer 2082 2083ifdef CONFIG_CC_IS_CLANG 2084quiet_cmd_clang_tools = CHECK $< 2085 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2086 2087clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 2088 $(call cmd,clang_tools) 2089else 2090clang-tidy clang-analyzer: 2091 @echo "$@ requires CC=clang" >&2 2092 @false 2093endif 2094 2095# Scripts to check various things for consistency 2096# --------------------------------------------------------------------------- 2097 2098PHONY += includecheck versioncheck coccicheck export_report 2099 2100includecheck: 2101 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2102 -name '*.[hcS]' -type f -print | sort \ 2103 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2104 2105versioncheck: 2106 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2107 -name '*.[hcS]' -type f -print | sort \ 2108 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2109 2110coccicheck: 2111 $(Q)$(BASH) $(srctree)/scripts/$@ 2112 2113export_report: 2114 $(PERL) $(srctree)/scripts/export_report.pl 2115 2116PHONY += checkstack kernelrelease kernelversion image_name 2117 2118# UML needs a little special treatment here. It wants to use the host 2119# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2120# else wants $(ARCH), including people doing cross-builds, which means 2121# that $(SUBARCH) doesn't work here. 2122ifeq ($(ARCH), um) 2123CHECKSTACK_ARCH := $(SUBARCH) 2124else 2125CHECKSTACK_ARCH := $(ARCH) 2126endif 2127checkstack: 2128 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2129 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 2130 2131kernelrelease: 2132 @$(filechk_kernel.release) 2133 2134kernelversion: 2135 @echo $(KERNELVERSION) 2136 2137image_name: 2138 @echo $(KBUILD_IMAGE) 2139 2140quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2141 cmd_rmfiles = rm -rf $(rm-files) 2142 2143# read saved command lines for existing targets 2144existing-targets := $(wildcard $(sort $(targets))) 2145 2146-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2147 2148endif # config-build 2149endif # mixed-build 2150endif # need-sub-make 2151 2152PHONY += FORCE 2153FORCE: 2154 2155# Declare the contents of the PHONY variable as phony. We keep that 2156# information in a variable so we can use it in if_changed and friends. 2157.PHONY: $(PHONY) 2158