1# SPDX-License-Identifier: GPL-2.0 2VERSION = 6 3PATCHLEVEL = 8 4SUBLEVEL = 0 5EXTRAVERSION = -rc3 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# backward compatibility 159KBUILD_EXTRA_WARN ?= $(KBUILD_ENABLE_EXTRA_GCC_CHECKS) 160 161ifeq ("$(origin W)", "command line") 162 KBUILD_EXTRA_WARN := $(W) 163endif 164 165export KBUILD_EXTRA_WARN 166 167# Kbuild will save output files in the current working directory. 168# This does not need to match to the root of the kernel source tree. 169# 170# For example, you can do this: 171# 172# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 173# 174# If you want to save output files in a different location, there are 175# two syntaxes to specify it. 176# 177# 1) O= 178# Use "make O=dir/to/store/output/files/" 179# 180# 2) Set KBUILD_OUTPUT 181# Set the environment variable KBUILD_OUTPUT to point to the output directory. 182# export KBUILD_OUTPUT=dir/to/store/output/files/; make 183# 184# The O= assignment takes precedence over the KBUILD_OUTPUT environment 185# variable. 186 187# Do we want to change the working directory? 188ifeq ("$(origin O)", "command line") 189 KBUILD_OUTPUT := $(O) 190endif 191 192ifneq ($(KBUILD_OUTPUT),) 193# $(realpath ...) gets empty if the path does not exist. Run 'mkdir -p' first. 194$(shell mkdir -p "$(KBUILD_OUTPUT)") 195# $(realpath ...) resolves symlinks 196abs_objtree := $(realpath $(KBUILD_OUTPUT)) 197$(if $(abs_objtree),,$(error failed to create output directory "$(KBUILD_OUTPUT)")) 198endif # ifneq ($(KBUILD_OUTPUT),) 199 200ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 201$(error source directory cannot contain spaces or colons) 202endif 203 204ifneq ($(filter 3.%,$(MAKE_VERSION)),) 205# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 206# We need to invoke sub-make to avoid implicit rules in the top Makefile. 207need-sub-make := 1 208# Cancel implicit rules for this Makefile. 209$(this-makefile): ; 210endif 211 212export sub_make_done := 1 213 214endif # sub_make_done 215 216ifeq ($(abs_objtree),$(CURDIR)) 217# Suppress "Entering directory ..." if we are at the final work directory. 218no-print-directory := --no-print-directory 219else 220# Recursion to show "Entering directory ..." 221need-sub-make := 1 222endif 223 224ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),) 225# If --no-print-directory is unset, recurse once again to set it. 226# You may end up recursing into __sub-make twice. This is needed due to the 227# behavior change in GNU Make 4.4.1. 228need-sub-make := 1 229endif 230 231ifeq ($(need-sub-make),1) 232 233PHONY += $(MAKECMDGOALS) __sub-make 234 235$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 236 @: 237 238# Invoke a second make in the output directory, passing relevant variables 239__sub-make: 240 $(Q)$(MAKE) $(no-print-directory) -C $(abs_objtree) \ 241 -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 242 243else # need-sub-make 244 245# We process the rest of the Makefile if this is the final invocation of make 246 247ifeq ($(abs_srctree),$(abs_objtree)) 248 # building in the source tree 249 srctree := . 250 building_out_of_srctree := 251else 252 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 253 # building in a subdirectory of the source tree 254 srctree := .. 255 else 256 srctree := $(abs_srctree) 257 endif 258 building_out_of_srctree := 1 259endif 260 261ifneq ($(KBUILD_ABS_SRCTREE),) 262srctree := $(abs_srctree) 263endif 264 265objtree := . 266VPATH := $(srctree) 267 268export building_out_of_srctree srctree objtree VPATH 269 270# To make sure we do not include .config for any of the *config targets 271# catch them early, and hand them over to scripts/kconfig/Makefile 272# It is allowed to specify more targets when calling make, including 273# mixing *config targets and build targets. 274# For example 'make oldconfig all'. 275# Detect when mixed targets is specified, and make a second invocation 276# of make so .config is not included in this case either (for *config). 277 278version_h := include/generated/uapi/linux/version.h 279 280clean-targets := %clean mrproper cleandocs 281no-dot-config-targets := $(clean-targets) \ 282 cscope gtags TAGS tags help% %docs check% coccicheck \ 283 $(version_h) headers headers_% archheaders archscripts \ 284 %asm-generic kernelversion %src-pkg dt_binding_check \ 285 outputmakefile rustavailable rustfmt rustfmtcheck 286no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \ 287 image_name 288single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/ 289 290config-build := 291mixed-build := 292need-config := 1 293may-sync-config := 1 294single-build := 295 296ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 297 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 298 need-config := 299 endif 300endif 301 302ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 303 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 304 may-sync-config := 305 endif 306endif 307 308need-compiler := $(may-sync-config) 309 310ifneq ($(KBUILD_EXTMOD),) 311 may-sync-config := 312endif 313 314ifeq ($(KBUILD_EXTMOD),) 315 ifneq ($(filter %config,$(MAKECMDGOALS)),) 316 config-build := 1 317 ifneq ($(words $(MAKECMDGOALS)),1) 318 mixed-build := 1 319 endif 320 endif 321endif 322 323# We cannot build single targets and the others at the same time 324ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 325 single-build := 1 326 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 327 mixed-build := 1 328 endif 329endif 330 331# For "make -j clean all", "make -j mrproper defconfig all", etc. 332ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 333 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 334 mixed-build := 1 335 endif 336endif 337 338# install and modules_install need also be processed one by one 339ifneq ($(filter install,$(MAKECMDGOALS)),) 340 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 341 mixed-build := 1 342 endif 343endif 344 345ifdef mixed-build 346# =========================================================================== 347# We're called with mixed targets (*config and build targets). 348# Handle them one by one. 349 350PHONY += $(MAKECMDGOALS) __build_one_by_one 351 352$(MAKECMDGOALS): __build_one_by_one 353 @: 354 355__build_one_by_one: 356 $(Q)set -e; \ 357 for i in $(MAKECMDGOALS); do \ 358 $(MAKE) -f $(srctree)/Makefile $$i; \ 359 done 360 361else # !mixed-build 362 363include $(srctree)/scripts/Kbuild.include 364 365# Read KERNELRELEASE from include/config/kernel.release (if it exists) 366KERNELRELEASE = $(call read-file, include/config/kernel.release) 367KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 368export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 369 370include $(srctree)/scripts/subarch.include 371 372# Cross compiling and selecting different set of gcc/bin-utils 373# --------------------------------------------------------------------------- 374# 375# When performing cross compilation for other architectures ARCH shall be set 376# to the target architecture. (See arch/* for the possibilities). 377# ARCH can be set during invocation of make: 378# make ARCH=arm64 379# Another way is to have ARCH set in the environment. 380# The default ARCH is the host where make is executed. 381 382# CROSS_COMPILE specify the prefix used for all executables used 383# during compilation. Only gcc and related bin-utils executables 384# are prefixed with $(CROSS_COMPILE). 385# CROSS_COMPILE can be set on the command line 386# make CROSS_COMPILE=aarch64-linux-gnu- 387# Alternatively CROSS_COMPILE can be set in the environment. 388# Default value for CROSS_COMPILE is not to prefix executables 389# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 390ARCH ?= $(SUBARCH) 391 392# Architecture as present in compile.h 393UTS_MACHINE := $(ARCH) 394SRCARCH := $(ARCH) 395 396# Additional ARCH settings for x86 397ifeq ($(ARCH),i386) 398 SRCARCH := x86 399endif 400ifeq ($(ARCH),x86_64) 401 SRCARCH := x86 402endif 403 404# Additional ARCH settings for sparc 405ifeq ($(ARCH),sparc32) 406 SRCARCH := sparc 407endif 408ifeq ($(ARCH),sparc64) 409 SRCARCH := sparc 410endif 411 412# Additional ARCH settings for parisc 413ifeq ($(ARCH),parisc64) 414 SRCARCH := parisc 415endif 416 417export cross_compiling := 418ifneq ($(SRCARCH),$(SUBARCH)) 419cross_compiling := 1 420endif 421 422KCONFIG_CONFIG ?= .config 423export KCONFIG_CONFIG 424 425# SHELL used by kbuild 426CONFIG_SHELL := sh 427 428HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 429HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 430HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 431 432ifneq ($(LLVM),) 433ifneq ($(filter %/,$(LLVM)),) 434LLVM_PREFIX := $(LLVM) 435else ifneq ($(filter -%,$(LLVM)),) 436LLVM_SUFFIX := $(LLVM) 437endif 438 439HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 440HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 441else 442HOSTCC = gcc 443HOSTCXX = g++ 444endif 445HOSTRUSTC = rustc 446HOSTPKG_CONFIG = pkg-config 447 448KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 449 -O2 -fomit-frame-pointer -std=gnu11 450KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 451KBUILD_USERLDFLAGS := $(USERLDFLAGS) 452 453# These flags apply to all Rust code in the tree, including the kernel and 454# host programs. 455export rust_common_flags := --edition=2021 \ 456 -Zbinary_dep_depinfo=y \ 457 -Dunsafe_op_in_unsafe_fn -Drust_2018_idioms \ 458 -Dunreachable_pub -Dnon_ascii_idents \ 459 -Wmissing_docs \ 460 -Drustdoc::missing_crate_level_docs \ 461 -Dclippy::correctness -Dclippy::style \ 462 -Dclippy::suspicious -Dclippy::complexity \ 463 -Dclippy::perf \ 464 -Dclippy::let_unit_value -Dclippy::mut_mut \ 465 -Dclippy::needless_bitwise_bool \ 466 -Dclippy::needless_continue \ 467 -Dclippy::no_mangle_with_rust_abi \ 468 -Wclippy::dbg_macro 469 470KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 471KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 472KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 473 -Zallow-features= $(HOSTRUSTFLAGS) 474KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 475KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 476 477# Make variables (CC, etc...) 478CPP = $(CC) -E 479ifneq ($(LLVM),) 480CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 481LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 482AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 483NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 484OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 485OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 486READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 487STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 488else 489CC = $(CROSS_COMPILE)gcc 490LD = $(CROSS_COMPILE)ld 491AR = $(CROSS_COMPILE)ar 492NM = $(CROSS_COMPILE)nm 493OBJCOPY = $(CROSS_COMPILE)objcopy 494OBJDUMP = $(CROSS_COMPILE)objdump 495READELF = $(CROSS_COMPILE)readelf 496STRIP = $(CROSS_COMPILE)strip 497endif 498RUSTC = rustc 499RUSTDOC = rustdoc 500RUSTFMT = rustfmt 501CLIPPY_DRIVER = clippy-driver 502BINDGEN = bindgen 503CARGO = cargo 504PAHOLE = pahole 505RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 506LEX = flex 507YACC = bison 508AWK = awk 509INSTALLKERNEL := installkernel 510PERL = perl 511PYTHON3 = python3 512CHECK = sparse 513BASH = bash 514KGZIP = gzip 515KBZIP2 = bzip2 516KLZOP = lzop 517LZMA = lzma 518LZ4 = lz4c 519XZ = xz 520ZSTD = zstd 521 522CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 523 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 524NOSTDINC_FLAGS := 525CFLAGS_MODULE = 526RUSTFLAGS_MODULE = 527AFLAGS_MODULE = 528LDFLAGS_MODULE = 529CFLAGS_KERNEL = 530RUSTFLAGS_KERNEL = 531AFLAGS_KERNEL = 532LDFLAGS_vmlinux = 533 534# Use USERINCLUDE when you must reference the UAPI directories only. 535USERINCLUDE := \ 536 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 537 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 538 -I$(srctree)/include/uapi \ 539 -I$(objtree)/include/generated/uapi \ 540 -include $(srctree)/include/linux/compiler-version.h \ 541 -include $(srctree)/include/linux/kconfig.h 542 543# Use LINUXINCLUDE when you must reference the include/ directory. 544# Needed to be compatible with the O= option 545LINUXINCLUDE := \ 546 -I$(srctree)/arch/$(SRCARCH)/include \ 547 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 548 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 549 -I$(objtree)/include \ 550 $(USERINCLUDE) 551 552KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 553 554KBUILD_CFLAGS := 555KBUILD_CFLAGS += -std=gnu11 556KBUILD_CFLAGS += -fshort-wchar 557KBUILD_CFLAGS += -funsigned-char 558KBUILD_CFLAGS += -fno-common 559KBUILD_CFLAGS += -fno-PIE 560KBUILD_CFLAGS += -fno-strict-aliasing 561 562KBUILD_CPPFLAGS := -D__KERNEL__ 563KBUILD_RUSTFLAGS := $(rust_common_flags) \ 564 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 565 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 566 -Csymbol-mangling-version=v0 \ 567 -Crelocation-model=static \ 568 -Zfunction-sections=n \ 569 -Dclippy::float_arithmetic 570 571KBUILD_AFLAGS_KERNEL := 572KBUILD_CFLAGS_KERNEL := 573KBUILD_RUSTFLAGS_KERNEL := 574KBUILD_AFLAGS_MODULE := -DMODULE 575KBUILD_CFLAGS_MODULE := -DMODULE 576KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 577KBUILD_LDFLAGS_MODULE := 578KBUILD_LDFLAGS := 579CLANG_FLAGS := 580 581ifeq ($(KBUILD_CLIPPY),1) 582 RUSTC_OR_CLIPPY_QUIET := CLIPPY 583 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 584else 585 RUSTC_OR_CLIPPY_QUIET := RUSTC 586 RUSTC_OR_CLIPPY = $(RUSTC) 587endif 588 589ifdef RUST_LIB_SRC 590 export RUST_LIB_SRC 591endif 592 593# Allows the usage of unstable features in stable compilers. 594export RUSTC_BOOTSTRAP := 1 595 596export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 597export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO 598export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 599export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 600export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 601export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 602export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 603export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 604 605export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 606export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 607export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 608export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 609export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 610export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 611 612# Files to ignore in find ... statements 613 614export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 615 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 616 -prune -o 617 618# =========================================================================== 619# Rules shared between *config targets and build targets 620 621# Basic helpers built in scripts/basic/ 622PHONY += scripts_basic 623scripts_basic: 624 $(Q)$(MAKE) $(build)=scripts/basic 625 626PHONY += outputmakefile 627ifdef building_out_of_srctree 628# Before starting out-of-tree build, make sure the source tree is clean. 629# outputmakefile generates a Makefile in the output directory, if using a 630# separate output directory. This allows convenient use of make in the 631# output directory. 632# At the same time when output Makefile generated, generate .gitignore to 633# ignore whole output directory 634 635quiet_cmd_makefile = GEN Makefile 636 cmd_makefile = { \ 637 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 638 echo "include $(srctree)/Makefile"; \ 639 } > Makefile 640 641outputmakefile: 642 @if [ -f $(srctree)/.config -o \ 643 -d $(srctree)/include/config -o \ 644 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 645 echo >&2 "***"; \ 646 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 647 echo >&2 "*** in $(abs_srctree)";\ 648 echo >&2 "***"; \ 649 false; \ 650 fi 651 $(Q)ln -fsn $(srctree) source 652 $(call cmd,makefile) 653 $(Q)test -e .gitignore || \ 654 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 655endif 656 657# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 658# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 659# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 660# and from include/config/auto.conf.cmd to detect the compiler upgrade. 661CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 662 663ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 664include $(srctree)/scripts/Makefile.clang 665endif 666 667# Include this also for config targets because some architectures need 668# cc-cross-prefix to determine CROSS_COMPILE. 669ifdef need-compiler 670include $(srctree)/scripts/Makefile.compiler 671endif 672 673ifdef config-build 674# =========================================================================== 675# *config targets only - make sure prerequisites are updated, and descend 676# in scripts/kconfig to make the *config target 677 678# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 679# KBUILD_DEFCONFIG may point out an alternative default configuration 680# used for 'make defconfig' 681include $(srctree)/arch/$(SRCARCH)/Makefile 682export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 683 684config: outputmakefile scripts_basic FORCE 685 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 686 687%config: outputmakefile scripts_basic FORCE 688 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 689 690else #!config-build 691# =========================================================================== 692# Build targets only - this includes vmlinux, arch-specific targets, clean 693# targets and others. In general all targets except *config targets. 694 695# If building an external module we do not care about the all: rule 696# but instead __all depend on modules 697PHONY += all 698ifeq ($(KBUILD_EXTMOD),) 699__all: all 700else 701__all: modules 702endif 703 704targets := 705 706# Decide whether to build built-in, modular, or both. 707# Normally, just do built-in. 708 709KBUILD_MODULES := 710KBUILD_BUILTIN := 1 711 712# If we have only "make modules", don't compile built-in objects. 713ifeq ($(MAKECMDGOALS),modules) 714 KBUILD_BUILTIN := 715endif 716 717# If we have "make <whatever> modules", compile modules 718# in addition to whatever we do anyway. 719# Just "make" or "make all" shall build modules as well 720 721ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 722 KBUILD_MODULES := 1 723endif 724 725ifeq ($(MAKECMDGOALS),) 726 KBUILD_MODULES := 1 727endif 728 729export KBUILD_MODULES KBUILD_BUILTIN 730 731ifdef need-config 732include include/config/auto.conf 733endif 734 735ifeq ($(KBUILD_EXTMOD),) 736# Objects we will link into vmlinux / subdirs we need to visit 737core-y := 738drivers-y := 739libs-y := lib/ 740endif # KBUILD_EXTMOD 741 742# The all: target is the default when no target is given on the 743# command line. 744# This allow a user to issue only 'make' to build a kernel including modules 745# Defaults to vmlinux, but the arch makefile usually adds further targets 746all: vmlinux 747 748CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 749ifdef CONFIG_CC_IS_GCC 750CFLAGS_GCOV += -fno-tree-loop-im 751endif 752export CFLAGS_GCOV 753 754# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 755ifdef CONFIG_FUNCTION_TRACER 756 CC_FLAGS_FTRACE := -pg 757endif 758 759include $(srctree)/arch/$(SRCARCH)/Makefile 760 761ifdef need-config 762ifdef may-sync-config 763# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 764# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 765# because some architectures define CROSS_COMPILE there. 766include include/config/auto.conf.cmd 767 768$(KCONFIG_CONFIG): 769 @echo >&2 '***' 770 @echo >&2 '*** Configuration file "$@" not found!' 771 @echo >&2 '***' 772 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 773 @echo >&2 '*** "make menuconfig" or "make xconfig").' 774 @echo >&2 '***' 775 @/bin/false 776 777# The actual configuration files used during the build are stored in 778# include/generated/ and include/config/. Update them if .config is newer than 779# include/config/auto.conf (which mirrors .config). 780# 781# This exploits the 'multi-target pattern rule' trick. 782# The syncconfig should be executed only once to make all the targets. 783# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 784# 785# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 786# so you cannot notice that Kconfig is waiting for the user input. 787%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 788 $(Q)$(kecho) " SYNC $@" 789 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 790else # !may-sync-config 791# External modules and some install targets need include/generated/autoconf.h 792# and include/config/auto.conf but do not care if they are up-to-date. 793# Use auto.conf to trigger the test 794PHONY += include/config/auto.conf 795 796include/config/auto.conf: 797 @test -e include/generated/autoconf.h -a -e $@ || ( \ 798 echo >&2; \ 799 echo >&2 " ERROR: Kernel configuration is invalid."; \ 800 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 801 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 802 echo >&2 ; \ 803 /bin/false) 804 805endif # may-sync-config 806endif # need-config 807 808KBUILD_CFLAGS += -fno-delete-null-pointer-checks 809 810ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 811KBUILD_CFLAGS += -O2 812KBUILD_RUSTFLAGS += -Copt-level=2 813else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 814KBUILD_CFLAGS += -Os 815KBUILD_RUSTFLAGS += -Copt-level=s 816endif 817 818# Always set `debug-assertions` and `overflow-checks` because their default 819# depends on `opt-level` and `debug-assertions`, respectively. 820KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 821KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 822 823# Tell gcc to never replace conditional load with a non-conditional one 824ifdef CONFIG_CC_IS_GCC 825# gcc-10 renamed --param=allow-store-data-races=0 to 826# -fno-allow-store-data-races. 827KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 828KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 829endif 830 831ifdef CONFIG_READABLE_ASM 832# Disable optimizations that make assembler listings hard to read. 833# reorder blocks reorders the control in the function 834# ipa clone creates specialized cloned functions 835# partial inlining inlines only parts of functions 836KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 837endif 838 839stackp-flags-y := -fno-stack-protector 840stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 841stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 842 843KBUILD_CFLAGS += $(stackp-flags-y) 844 845KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings 846KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) 847 848ifdef CONFIG_FRAME_POINTER 849KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 850KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 851else 852# Some targets (ARM with Thumb2, for example), can't be built with frame 853# pointers. For those, we don't have FUNCTION_TRACER automatically 854# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 855# incompatible with -fomit-frame-pointer with current GCC, so we don't use 856# -fomit-frame-pointer with FUNCTION_TRACER. 857# In the Rust target specification, "frame-pointer" is set explicitly 858# to "may-omit". 859ifndef CONFIG_FUNCTION_TRACER 860KBUILD_CFLAGS += -fomit-frame-pointer 861endif 862endif 863 864# Initialize all stack variables with a 0xAA pattern. 865ifdef CONFIG_INIT_STACK_ALL_PATTERN 866KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 867endif 868 869# Initialize all stack variables with a zero value. 870ifdef CONFIG_INIT_STACK_ALL_ZERO 871KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 872ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 873# https://github.com/llvm/llvm-project/issues/44842 874CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 875export CC_AUTO_VAR_INIT_ZERO_ENABLER 876KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 877endif 878endif 879 880# While VLAs have been removed, GCC produces unreachable stack probes 881# for the randomize_kstack_offset feature. Disable it for all compilers. 882KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 883 884# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 885ifdef CONFIG_ZERO_CALL_USED_REGS 886KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 887endif 888 889ifdef CONFIG_FUNCTION_TRACER 890ifdef CONFIG_FTRACE_MCOUNT_USE_CC 891 CC_FLAGS_FTRACE += -mrecord-mcount 892 ifdef CONFIG_HAVE_NOP_MCOUNT 893 ifeq ($(call cc-option-yn, -mnop-mcount),y) 894 CC_FLAGS_FTRACE += -mnop-mcount 895 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 896 endif 897 endif 898endif 899ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 900 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 901 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 902 endif 903endif 904ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 905 ifdef CONFIG_HAVE_C_RECORDMCOUNT 906 BUILD_C_RECORDMCOUNT := y 907 export BUILD_C_RECORDMCOUNT 908 endif 909endif 910ifdef CONFIG_HAVE_FENTRY 911 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 912 ifeq ($(call cc-option-yn, -mfentry),y) 913 CC_FLAGS_FTRACE += -mfentry 914 CC_FLAGS_USING += -DCC_USING_FENTRY 915 endif 916endif 917export CC_FLAGS_FTRACE 918KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 919KBUILD_AFLAGS += $(CC_FLAGS_USING) 920endif 921 922# We trigger additional mismatches with less inlining 923ifdef CONFIG_DEBUG_SECTION_MISMATCH 924KBUILD_CFLAGS += -fno-inline-functions-called-once 925endif 926 927# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 928ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 929KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 930KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 931LDFLAGS_vmlinux += --gc-sections 932endif 933 934ifdef CONFIG_SHADOW_CALL_STACK 935ifndef CONFIG_DYNAMIC_SCS 936CC_FLAGS_SCS := -fsanitize=shadow-call-stack 937KBUILD_CFLAGS += $(CC_FLAGS_SCS) 938endif 939export CC_FLAGS_SCS 940endif 941 942ifdef CONFIG_LTO_CLANG 943ifdef CONFIG_LTO_CLANG_THIN 944CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 945KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache 946else 947CC_FLAGS_LTO := -flto 948endif 949CC_FLAGS_LTO += -fvisibility=hidden 950 951# Limit inlining across translation units to reduce binary size 952KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 953 954# Check for frame size exceeding threshold during prolog/epilog insertion 955# when using lld < 13.0.0. 956ifneq ($(CONFIG_FRAME_WARN),0) 957ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 130000),y) 958KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) 959endif 960endif 961endif 962 963ifdef CONFIG_LTO 964KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 965KBUILD_AFLAGS += -fno-lto 966export CC_FLAGS_LTO 967endif 968 969ifdef CONFIG_CFI_CLANG 970CC_FLAGS_CFI := -fsanitize=kcfi 971KBUILD_CFLAGS += $(CC_FLAGS_CFI) 972export CC_FLAGS_CFI 973endif 974 975ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 976KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 977endif 978 979# arch Makefile may override CC so keep this after arch Makefile is included 980NOSTDINC_FLAGS += -nostdinc 981 982# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 983# the kernel uses only C99 flexible arrays for dynamically sized trailing 984# arrays. Enforce this for everything that may examine structure sizes and 985# perform bounds checking. 986KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 987 988#Currently, disable -Wstringop-overflow for GCC 11, globally. 989KBUILD_CFLAGS-$(CONFIG_CC_NO_STRINGOP_OVERFLOW) += $(call cc-option, -Wno-stringop-overflow) 990KBUILD_CFLAGS-$(CONFIG_CC_STRINGOP_OVERFLOW) += $(call cc-option, -Wstringop-overflow) 991 992# disable invalid "can't wrap" optimizations for signed / pointers 993KBUILD_CFLAGS += -fno-strict-overflow 994 995# Make sure -fstack-check isn't enabled (like gentoo apparently did) 996KBUILD_CFLAGS += -fno-stack-check 997 998# conserve stack if available 999ifdef CONFIG_CC_IS_GCC 1000KBUILD_CFLAGS += -fconserve-stack 1001endif 1002 1003# change __FILE__ to the relative path from the srctree 1004KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1005 1006# include additional Makefiles when needed 1007include-y := scripts/Makefile.extrawarn 1008include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1009include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1010include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1011include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1012include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1013include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1014include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1015include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1016include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1017 1018include $(addprefix $(srctree)/, $(include-y)) 1019 1020# scripts/Makefile.gcc-plugins is intentionally included last. 1021# Do not add $(call cc-option,...) below this line. When you build the kernel 1022# from the clean source tree, the GCC plugins do not exist at this point. 1023 1024# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1025KBUILD_CPPFLAGS += $(KCPPFLAGS) 1026KBUILD_AFLAGS += $(KAFLAGS) 1027KBUILD_CFLAGS += $(KCFLAGS) 1028KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1029 1030KBUILD_LDFLAGS_MODULE += --build-id=sha1 1031LDFLAGS_vmlinux += --build-id=sha1 1032 1033KBUILD_LDFLAGS += -z noexecstack 1034ifeq ($(CONFIG_LD_IS_BFD),y) 1035KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1036endif 1037 1038ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1039LDFLAGS_vmlinux += -X 1040endif 1041 1042ifeq ($(CONFIG_RELR),y) 1043# ld.lld before 15 did not support -z pack-relative-relocs. 1044LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1045endif 1046 1047# We never want expected sections to be placed heuristically by the 1048# linker. All sections should be explicitly named in the linker script. 1049ifdef CONFIG_LD_ORPHAN_WARN 1050LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1051endif 1052 1053# Align the bit size of userspace programs with the kernel 1054KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1055KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1056 1057# make the checker run with the right architecture 1058CHECKFLAGS += --arch=$(ARCH) 1059 1060# insure the checker run with the right endianness 1061CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1062 1063# the checker needs the correct machine size 1064CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1065 1066# Default kernel image to build when no specific target is given. 1067# KBUILD_IMAGE may be overruled on the command line or 1068# set in the environment 1069# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1070# this default value 1071export KBUILD_IMAGE ?= vmlinux 1072 1073# 1074# INSTALL_PATH specifies where to place the updated kernel and system map 1075# images. Default is /boot, but you can set it to other values 1076export INSTALL_PATH ?= /boot 1077 1078# 1079# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1080# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1081# an argument if needed. Otherwise it defaults to the kernel install path 1082# 1083export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1084 1085# 1086# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1087# relocations required by build roots. This is not defined in the 1088# makefile but the argument can be passed to make if needed. 1089# 1090 1091MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1092export MODLIB 1093 1094PHONY += prepare0 1095 1096export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1097export MODORDER := $(extmod_prefix)modules.order 1098export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1099 1100ifeq ($(KBUILD_EXTMOD),) 1101 1102build-dir := . 1103clean-dirs := $(sort . Documentation \ 1104 $(patsubst %/,%,$(filter %/, $(core-) \ 1105 $(drivers-) $(libs-)))) 1106 1107export ARCH_CORE := $(core-y) 1108export ARCH_LIB := $(filter %/, $(libs-y)) 1109export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1110# Externally visible symbols (used by link-vmlinux.sh) 1111 1112KBUILD_VMLINUX_OBJS := ./built-in.a 1113ifdef CONFIG_MODULES 1114KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1115KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1116else 1117KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1118endif 1119 1120export KBUILD_VMLINUX_LIBS 1121export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1122 1123ifdef CONFIG_TRIM_UNUSED_KSYMS 1124# For the kernel to actually contain only the needed exported symbols, 1125# we have to build modules as well to determine what those symbols are. 1126KBUILD_MODULES := 1 1127endif 1128 1129# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1130quiet_cmd_ar_vmlinux.a = AR $@ 1131 cmd_ar_vmlinux.a = \ 1132 rm -f $@; \ 1133 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1134 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1135 1136targets += vmlinux.a 1137vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1138 $(call if_changed,ar_vmlinux.a) 1139 1140PHONY += vmlinux_o 1141vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1142 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1143 1144vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1145 @: 1146 1147PHONY += vmlinux 1148# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1149# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1150# unrelated; the decompressors just happen to have the same base name, 1151# arch/*/boot/compressed/vmlinux. 1152# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1153# 1154# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1155# https://savannah.gnu.org/bugs/?61463 1156# For Make > 4.4, the following simple code will work: 1157# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1158vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1159vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1160vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1161 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1162 1163# The actual objects are generated when descending, 1164# make sure no implicit rule kicks in 1165$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1166 1167ifeq ($(origin KERNELRELEASE),file) 1168filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1169else 1170filechk_kernel.release = echo $(KERNELRELEASE) 1171endif 1172 1173# Store (new) KERNELRELEASE string in include/config/kernel.release 1174include/config/kernel.release: FORCE 1175 $(call filechk,kernel.release) 1176 1177# Additional helpers built in scripts/ 1178# Carefully list dependencies so we do not try to build scripts twice 1179# in parallel 1180PHONY += scripts 1181scripts: scripts_basic scripts_dtc 1182 $(Q)$(MAKE) $(build)=$(@) 1183 1184# Things we need to do before we recursively start building the kernel 1185# or the modules are listed in "prepare". 1186# A multi level approach is used. prepareN is processed before prepareN-1. 1187# archprepare is used in arch Makefiles and when processed asm symlink, 1188# version.h and scripts_basic is processed / created. 1189 1190PHONY += prepare archprepare 1191 1192archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1193 asm-generic $(version_h) include/generated/utsrelease.h \ 1194 include/generated/compile.h include/generated/autoconf.h remove-stale-files 1195 1196prepare0: archprepare 1197 $(Q)$(MAKE) $(build)=scripts/mod 1198 $(Q)$(MAKE) $(build)=. prepare 1199 1200# All the preparing.. 1201prepare: prepare0 1202ifdef CONFIG_RUST 1203 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1204 $(Q)$(MAKE) $(build)=rust 1205endif 1206 1207PHONY += remove-stale-files 1208remove-stale-files: 1209 $(Q)$(srctree)/scripts/remove-stale-files 1210 1211# Support for using generic headers in asm-generic 1212asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1213 1214PHONY += asm-generic uapi-asm-generic 1215asm-generic: uapi-asm-generic 1216 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1217 generic=include/asm-generic 1218uapi-asm-generic: 1219 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1220 generic=include/uapi/asm-generic 1221 1222# Generate some files 1223# --------------------------------------------------------------------------- 1224 1225# KERNELRELEASE can change from a few different places, meaning version.h 1226# needs to be updated, so this check is forced on all builds 1227 1228uts_len := 64 1229define filechk_utsrelease.h 1230 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1231 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1232 exit 1; \ 1233 fi; \ 1234 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1235endef 1236 1237define filechk_version.h 1238 if [ $(SUBLEVEL) -gt 255 ]; then \ 1239 echo \#define LINUX_VERSION_CODE $(shell \ 1240 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1241 else \ 1242 echo \#define LINUX_VERSION_CODE $(shell \ 1243 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1244 fi; \ 1245 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1246 ((c) > 255 ? 255 : (c)))'; \ 1247 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1248 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1249 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1250endef 1251 1252$(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1253$(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0) 1254$(version_h): FORCE 1255 $(call filechk,version.h) 1256 1257include/generated/utsrelease.h: include/config/kernel.release FORCE 1258 $(call filechk,utsrelease.h) 1259 1260filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1261 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1262 1263include/generated/compile.h: FORCE 1264 $(call filechk,compile.h) 1265 1266PHONY += headerdep 1267headerdep: 1268 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1269 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1270 1271# --------------------------------------------------------------------------- 1272# Kernel headers 1273 1274#Default location for installed headers 1275export INSTALL_HDR_PATH = $(objtree)/usr 1276 1277quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1278 cmd_headers_install = \ 1279 mkdir -p $(INSTALL_HDR_PATH); \ 1280 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1281 usr/include $(INSTALL_HDR_PATH) 1282 1283PHONY += headers_install 1284headers_install: headers 1285 $(call cmd,headers_install) 1286 1287PHONY += archheaders archscripts 1288 1289hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1290 1291PHONY += headers 1292headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1293 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML)) 1294 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1295 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1296 1297ifdef CONFIG_HEADERS_INSTALL 1298prepare: headers 1299endif 1300 1301PHONY += scripts_unifdef 1302scripts_unifdef: scripts_basic 1303 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1304 1305# --------------------------------------------------------------------------- 1306# Install 1307 1308# Many distributions have the custom install script, /sbin/installkernel. 1309# If DKMS is installed, 'make install' will eventually recurse back 1310# to this Makefile to build and install external modules. 1311# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1312 1313quiet_cmd_install = INSTALL $(INSTALL_PATH) 1314 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1315 1316# --------------------------------------------------------------------------- 1317# vDSO install 1318 1319PHONY += vdso_install 1320vdso_install: export INSTALL_FILES = $(vdso-install-y) 1321vdso_install: 1322 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1323 1324# --------------------------------------------------------------------------- 1325# Tools 1326 1327ifdef CONFIG_OBJTOOL 1328prepare: tools/objtool 1329endif 1330 1331ifdef CONFIG_BPF 1332ifdef CONFIG_DEBUG_INFO_BTF 1333prepare: tools/bpf/resolve_btfids 1334endif 1335endif 1336 1337PHONY += resolve_btfids_clean 1338 1339resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1340 1341# tools/bpf/resolve_btfids directory might not exist 1342# in output directory, skip its clean in that case 1343resolve_btfids_clean: 1344ifneq ($(wildcard $(resolve_btfids_O)),) 1345 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1346endif 1347 1348# Clear a bunch of variables before executing the submake 1349ifeq ($(quiet),silent_) 1350tools_silent=s 1351endif 1352 1353tools/: FORCE 1354 $(Q)mkdir -p $(objtree)/tools 1355 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1356 1357tools/%: FORCE 1358 $(Q)mkdir -p $(objtree)/tools 1359 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1360 1361# --------------------------------------------------------------------------- 1362# Kernel selftest 1363 1364PHONY += kselftest 1365kselftest: headers 1366 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1367 1368kselftest-%: headers FORCE 1369 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1370 1371PHONY += kselftest-merge 1372kselftest-merge: 1373 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1374 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1375 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1376 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1377 1378# --------------------------------------------------------------------------- 1379# Devicetree files 1380 1381ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1382dtstree := arch/$(SRCARCH)/boot/dts 1383endif 1384 1385ifneq ($(dtstree),) 1386 1387%.dtb: dtbs_prepare 1388 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1389 1390%.dtbo: dtbs_prepare 1391 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1392 1393PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1394dtbs: dtbs_prepare 1395 $(Q)$(MAKE) $(build)=$(dtstree) 1396 1397# include/config/kernel.release is actually needed when installing DTBs because 1398# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1399# dtbs_install depend on it as dtbs_install may run as root. 1400dtbs_prepare: include/config/kernel.release scripts_dtc 1401 1402ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1403export CHECK_DTBS=y 1404endif 1405 1406ifneq ($(CHECK_DTBS),) 1407dtbs_prepare: dt_binding_check 1408endif 1409 1410dtbs_check: dtbs 1411 1412dtbs_install: 1413 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1414 1415ifdef CONFIG_OF_EARLY_FLATTREE 1416all: dtbs 1417endif 1418 1419endif 1420 1421PHONY += scripts_dtc 1422scripts_dtc: scripts_basic 1423 $(Q)$(MAKE) $(build)=scripts/dtc 1424 1425ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1426export CHECK_DT_BINDING=y 1427endif 1428 1429PHONY += dt_binding_check 1430dt_binding_check: scripts_dtc 1431 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1432 1433PHONY += dt_compatible_check 1434dt_compatible_check: dt_binding_check 1435 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1436 1437# --------------------------------------------------------------------------- 1438# Modules 1439 1440ifdef CONFIG_MODULES 1441 1442# By default, build modules as well 1443 1444all: modules 1445 1446# When we're building modules with modversions, we need to consider 1447# the built-in objects during the descend as well, in order to 1448# make sure the checksums are up to date before we record them. 1449ifdef CONFIG_MODVERSIONS 1450 KBUILD_BUILTIN := 1 1451endif 1452 1453# Build modules 1454# 1455 1456# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1457# is an exception. 1458ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1459KBUILD_BUILTIN := 1 1460modules: vmlinux 1461endif 1462 1463modules: modules_prepare 1464 1465# Target to prepare building external modules 1466modules_prepare: prepare 1467 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1468 1469endif # CONFIG_MODULES 1470 1471### 1472# Cleaning is done on three levels. 1473# make clean Delete most generated files 1474# Leave enough to build external modules 1475# make mrproper Delete the current configuration, and all generated files 1476# make distclean Remove editor backup files, patch leftover files and the like 1477 1478# Directories & files removed with 'make clean' 1479CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1480 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1481 compile_commands.json .thinlto-cache rust/test \ 1482 rust-project.json .vmlinux.objs .vmlinux.export.c 1483 1484# Directories & files removed with 'make mrproper' 1485MRPROPER_FILES += include/config include/generated \ 1486 arch/$(SRCARCH)/include/generated .objdiff \ 1487 debian snap tar-install \ 1488 .config .config.old .version \ 1489 Module.symvers \ 1490 certs/signing_key.pem \ 1491 certs/x509.genkey \ 1492 vmlinux-gdb.py \ 1493 rpmbuild \ 1494 rust/libmacros.so 1495 1496# clean - Delete most, but leave enough to build external modules 1497# 1498clean: rm-files := $(CLEAN_FILES) 1499 1500PHONY += archclean vmlinuxclean 1501 1502vmlinuxclean: 1503 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1504 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1505 1506clean: archclean vmlinuxclean resolve_btfids_clean 1507 1508# mrproper - Delete all generated files, including .config 1509# 1510mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1511mrproper-dirs := $(addprefix _mrproper_,scripts) 1512 1513PHONY += $(mrproper-dirs) mrproper 1514$(mrproper-dirs): 1515 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1516 1517mrproper: clean $(mrproper-dirs) 1518 $(call cmd,rmfiles) 1519 @find . $(RCS_FIND_IGNORE) \ 1520 \( -name '*.rmeta' \) \ 1521 -type f -print | xargs rm -f 1522 1523# distclean 1524# 1525PHONY += distclean 1526 1527distclean: mrproper 1528 @find . $(RCS_FIND_IGNORE) \ 1529 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1530 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1531 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1532 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1533 -type f -print | xargs rm -f 1534 1535 1536# Packaging of the kernel to various formats 1537# --------------------------------------------------------------------------- 1538 1539%src-pkg: FORCE 1540 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1541%pkg: include/config/kernel.release FORCE 1542 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1543 1544# Brief documentation of the typical targets used 1545# --------------------------------------------------------------------------- 1546 1547boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1548boards := $(sort $(notdir $(boards))) 1549board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1550board-dirs := $(sort $(notdir $(board-dirs:/=))) 1551 1552PHONY += help 1553help: 1554 @echo 'Cleaning targets:' 1555 @echo ' clean - Remove most generated files but keep the config and' 1556 @echo ' enough build support to build external modules' 1557 @echo ' mrproper - Remove all generated files + config + various backup files' 1558 @echo ' distclean - mrproper + remove editor backup and patch files' 1559 @echo '' 1560 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1561 @echo '' 1562 @echo 'Other generic targets:' 1563 @echo ' all - Build all targets marked with [*]' 1564 @echo '* vmlinux - Build the bare kernel' 1565 @echo '* modules - Build all modules' 1566 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1567 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1568 @echo ' dir/ - Build all files in dir and below' 1569 @echo ' dir/file.[ois] - Build specified target only' 1570 @echo ' dir/file.ll - Build the LLVM assembly file' 1571 @echo ' (requires compiler support for LLVM assembly generation)' 1572 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1573 @echo ' (requires a recent binutils and recent build (System.map))' 1574 @echo ' dir/file.ko - Build module including final link' 1575 @echo ' modules_prepare - Set up for building external modules' 1576 @echo ' tags/TAGS - Generate tags file for editors' 1577 @echo ' cscope - Generate cscope index' 1578 @echo ' gtags - Generate GNU GLOBAL index' 1579 @echo ' kernelrelease - Output the release version string (use with make -s)' 1580 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1581 @echo ' image_name - Output the image name (use with make -s)' 1582 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1583 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1584 echo '' 1585 @echo 'Static analysers:' 1586 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1587 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1588 @echo ' versioncheck - Sanity check on version.h usage' 1589 @echo ' includecheck - Check for duplicate included header files' 1590 @echo ' export_report - List the usages of all exported symbols' 1591 @echo ' headerdep - Detect inclusion cycles in headers' 1592 @echo ' coccicheck - Check with Coccinelle' 1593 @echo ' clang-analyzer - Check with clang static analyzer' 1594 @echo ' clang-tidy - Check with clang-tidy' 1595 @echo '' 1596 @echo 'Tools:' 1597 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1598 @echo '' 1599 @echo 'Kernel selftest:' 1600 @echo ' kselftest - Build and run kernel selftest' 1601 @echo ' Build, install, and boot kernel before' 1602 @echo ' running kselftest on it' 1603 @echo ' Run as root for full coverage' 1604 @echo ' kselftest-all - Build kernel selftest' 1605 @echo ' kselftest-install - Build and install kernel selftest' 1606 @echo ' kselftest-clean - Remove all generated kselftest files' 1607 @echo ' kselftest-merge - Merge all the config dependencies of' 1608 @echo ' kselftest to existing .config.' 1609 @echo '' 1610 @echo 'Rust targets:' 1611 @echo ' rustavailable - Checks whether the Rust toolchain is' 1612 @echo ' available and, if not, explains why.' 1613 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1614 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1615 @echo ' is formatted, printing a diff otherwise.' 1616 @echo ' rustdoc - Generate Rust documentation' 1617 @echo ' (requires kernel .config)' 1618 @echo ' rusttest - Runs the Rust tests' 1619 @echo ' (requires kernel .config; downloads external repos)' 1620 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1621 @echo ' (requires kernel .config)' 1622 @echo ' dir/file.[os] - Build specified target only' 1623 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1624 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1625 @echo ' The output is not intended to be compilable.' 1626 @echo ' dir/file.ll - Build the LLVM assembly file' 1627 @echo '' 1628 @$(if $(dtstree), \ 1629 echo 'Devicetree:'; \ 1630 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1631 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1632 echo ' dt_binding_check - Validate device tree binding documents'; \ 1633 echo ' dtbs_check - Validate device tree source files';\ 1634 echo '') 1635 1636 @echo 'Userspace tools targets:' 1637 @echo ' use "make tools/help"' 1638 @echo ' or "cd tools; make help"' 1639 @echo '' 1640 @echo 'Kernel packaging:' 1641 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1642 @echo '' 1643 @echo 'Documentation targets:' 1644 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1645 @echo '' 1646 @echo 'Architecture-specific targets ($(SRCARCH)):' 1647 @$(or $(archhelp),\ 1648 echo ' No architecture-specific help defined for $(SRCARCH)') 1649 @echo '' 1650 @$(if $(boards), \ 1651 $(foreach b, $(boards), \ 1652 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1653 echo '') 1654 @$(if $(board-dirs), \ 1655 $(foreach b, $(board-dirs), \ 1656 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1657 printf " %-16s - Show all of the above\\n" help-boards; \ 1658 echo '') 1659 1660 @echo ' make V=n [targets] 1: verbose build' 1661 @echo ' 2: give reason for rebuild of target' 1662 @echo ' V=1 and V=2 can be combined with V=12' 1663 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1664 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1665 @echo ' (sparse by default)' 1666 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1667 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1668 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where' 1669 @echo ' 1: warnings which may be relevant and do not occur too often' 1670 @echo ' 2: warnings which occur quite often but may still be relevant' 1671 @echo ' 3: more obscure warnings, can most likely be ignored' 1672 @echo ' c: extra checks in the configuration stage (Kconfig)' 1673 @echo ' e: warnings are being treated as errors' 1674 @echo ' Multiple levels can be combined with W=12 or W=123' 1675 @$(if $(dtstree), \ 1676 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1677 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1678 ) 1679 @echo '' 1680 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1681 @echo 'For further info see the ./README file' 1682 1683 1684help-board-dirs := $(addprefix help-,$(board-dirs)) 1685 1686help-boards: $(help-board-dirs) 1687 1688boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1689 1690$(help-board-dirs): help-%: 1691 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1692 @$(if $(boards-per-dir), \ 1693 $(foreach b, $(boards-per-dir), \ 1694 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1695 echo '') 1696 1697 1698# Documentation targets 1699# --------------------------------------------------------------------------- 1700DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1701 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs 1702PHONY += $(DOC_TARGETS) 1703$(DOC_TARGETS): 1704 $(Q)$(MAKE) $(build)=Documentation $@ 1705 1706 1707# Rust targets 1708# --------------------------------------------------------------------------- 1709 1710# "Is Rust available?" target 1711PHONY += rustavailable 1712rustavailable: 1713 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1714 1715# Documentation target 1716# 1717# Using the singular to avoid running afoul of `no-dot-config-targets`. 1718PHONY += rustdoc 1719rustdoc: prepare 1720 $(Q)$(MAKE) $(build)=rust $@ 1721 1722# Testing target 1723PHONY += rusttest 1724rusttest: prepare 1725 $(Q)$(MAKE) $(build)=rust $@ 1726 1727# Formatting targets 1728PHONY += rustfmt rustfmtcheck 1729 1730# We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream. 1731# 1732# We match using absolute paths since `find` does not resolve them 1733# when matching, which is a problem when e.g. `srctree` is `..`. 1734# We `grep` afterwards in order to remove the directory entry itself. 1735rustfmt: 1736 $(Q)find $(abs_srctree) -type f -name '*.rs' \ 1737 -o -path $(abs_srctree)/rust/alloc -prune \ 1738 -o -path $(abs_objtree)/rust/test -prune \ 1739 | grep -Fv $(abs_srctree)/rust/alloc \ 1740 | grep -Fv $(abs_objtree)/rust/test \ 1741 | grep -Fv generated \ 1742 | xargs $(RUSTFMT) $(rustfmt_flags) 1743 1744rustfmtcheck: rustfmt_flags = --check 1745rustfmtcheck: rustfmt 1746 1747# Misc 1748# --------------------------------------------------------------------------- 1749 1750PHONY += misc-check 1751misc-check: 1752 $(Q)$(srctree)/scripts/misc-check 1753 1754all: misc-check 1755 1756PHONY += scripts_gdb 1757scripts_gdb: prepare0 1758 $(Q)$(MAKE) $(build)=scripts/gdb 1759 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1760 1761ifdef CONFIG_GDB_SCRIPTS 1762all: scripts_gdb 1763endif 1764 1765else # KBUILD_EXTMOD 1766 1767filechk_kernel.release = echo $(KERNELRELEASE) 1768 1769### 1770# External module support. 1771# When building external modules the kernel used as basis is considered 1772# read-only, and no consistency checks are made and the make 1773# system is not used on the basis kernel. If updates are required 1774# in the basis kernel ordinary make commands (without M=...) must be used. 1775 1776# We are always building only modules. 1777KBUILD_BUILTIN := 1778KBUILD_MODULES := 1 1779 1780build-dir := $(KBUILD_EXTMOD) 1781 1782compile_commands.json: $(extmod_prefix)compile_commands.json 1783PHONY += compile_commands.json 1784 1785clean-dirs := $(KBUILD_EXTMOD) 1786clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1787 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1788 1789PHONY += prepare 1790# now expand this into a simple variable to reduce the cost of shell evaluations 1791prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1792prepare: 1793 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1794 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1795 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1796 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1797 fi 1798 1799PHONY += help 1800help: 1801 @echo ' Building external modules.' 1802 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1803 @echo '' 1804 @echo ' modules - default target, build the module(s)' 1805 @echo ' modules_install - install the module' 1806 @echo ' clean - remove generated files in module directory only' 1807 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 1808 @echo '' 1809 1810ifndef CONFIG_MODULES 1811modules modules_install: __external_modules_error 1812__external_modules_error: 1813 @echo >&2 '***' 1814 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 1815 @echo >&2 '*** You cannot build or install external modules.' 1816 @echo >&2 '***' 1817 @false 1818endif 1819 1820endif # KBUILD_EXTMOD 1821 1822# --------------------------------------------------------------------------- 1823# Modules 1824 1825PHONY += modules modules_install modules_sign modules_prepare 1826 1827modules_install: 1828 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 1829 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 1830 1831ifeq ($(CONFIG_MODULE_SIG),y) 1832# modules_sign is a subset of modules_install. 1833# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1834modules_sign: modules_install 1835 @: 1836else 1837modules_sign: 1838 @echo >&2 '***' 1839 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 1840 @echo >&2 '***' 1841 @false 1842endif 1843 1844ifdef CONFIG_MODULES 1845 1846$(MODORDER): $(build-dir) 1847 @: 1848 1849# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1850# This is solely useful to speed up test compiles. 1851modules: modpost 1852ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1853 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1854endif 1855 1856PHONY += modules_check 1857modules_check: $(MODORDER) 1858 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1859 1860else # CONFIG_MODULES 1861 1862modules: 1863 @: 1864 1865KBUILD_MODULES := 1866 1867endif # CONFIG_MODULES 1868 1869PHONY += modpost 1870modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 1871 $(if $(KBUILD_MODULES), modules_check) 1872 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1873 1874# Single targets 1875# --------------------------------------------------------------------------- 1876# To build individual files in subdirectories, you can do like this: 1877# 1878# make foo/bar/baz.s 1879# 1880# The supported suffixes for single-target are listed in 'single-targets' 1881# 1882# To build only under specific subdirectories, you can do like this: 1883# 1884# make foo/bar/baz/ 1885 1886ifdef single-build 1887 1888# .ko is special because modpost is needed 1889single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1890single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 1891 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 1892 1893$(single-ko): single_modules 1894 @: 1895$(single-no-ko): $(build-dir) 1896 @: 1897 1898# Remove MODORDER when done because it is not the real one. 1899PHONY += single_modules 1900single_modules: $(single-no-ko) modules_prepare 1901 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER) 1902 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1903ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1904 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1905endif 1906 $(Q)rm -f $(MODORDER) 1907 1908single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 1909 1910KBUILD_MODULES := 1 1911 1912endif 1913 1914# Preset locale variables to speed up the build process. Limit locale 1915# tweaks to this spot to avoid wrong language settings when running 1916# make menuconfig etc. 1917# Error messages still appears in the original language 1918PHONY += $(build-dir) 1919$(build-dir): prepare 1920 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 1921 1922clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1923PHONY += $(clean-dirs) clean 1924$(clean-dirs): 1925 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1926 1927clean: $(clean-dirs) 1928 $(call cmd,rmfiles) 1929 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1930 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 1931 -o -name '*.ko.*' \ 1932 -o -name '*.dtb' -o -name '*.dtbo' \ 1933 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 1934 -o -name '*.dt.yaml' \ 1935 -o -name '*.dwo' -o -name '*.lst' \ 1936 -o -name '*.su' -o -name '*.mod' \ 1937 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1938 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1939 -o -name '*.asn1.[ch]' \ 1940 -o -name '*.symtypes' -o -name 'modules.order' \ 1941 -o -name '*.c.[012]*.*' \ 1942 -o -name '*.ll' \ 1943 -o -name '*.gcno' \ 1944 -o -name '*.*.symversions' \) -type f -print \ 1945 -o -name '.tmp_*' -print \ 1946 | xargs rm -rf 1947 1948# Generate tags for editors 1949# --------------------------------------------------------------------------- 1950quiet_cmd_tags = GEN $@ 1951 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1952 1953tags TAGS cscope gtags: FORCE 1954 $(call cmd,tags) 1955 1956# IDE support targets 1957PHONY += rust-analyzer 1958rust-analyzer: 1959 $(Q)$(MAKE) $(build)=rust $@ 1960 1961# Script to generate missing namespace dependencies 1962# --------------------------------------------------------------------------- 1963 1964PHONY += nsdeps 1965nsdeps: export KBUILD_NSDEPS=1 1966nsdeps: modules 1967 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1968 1969# Clang Tooling 1970# --------------------------------------------------------------------------- 1971 1972quiet_cmd_gen_compile_commands = GEN $@ 1973 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1974 1975$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1976 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 1977 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1978 $(call if_changed,gen_compile_commands) 1979 1980targets += $(extmod_prefix)compile_commands.json 1981 1982PHONY += clang-tidy clang-analyzer 1983 1984ifdef CONFIG_CC_IS_CLANG 1985quiet_cmd_clang_tools = CHECK $< 1986 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1987 1988clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 1989 $(call cmd,clang_tools) 1990else 1991clang-tidy clang-analyzer: 1992 @echo "$@ requires CC=clang" >&2 1993 @false 1994endif 1995 1996# Scripts to check various things for consistency 1997# --------------------------------------------------------------------------- 1998 1999PHONY += includecheck versioncheck coccicheck export_report 2000 2001includecheck: 2002 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2003 -name '*.[hcS]' -type f -print | sort \ 2004 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2005 2006versioncheck: 2007 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2008 -name '*.[hcS]' -type f -print | sort \ 2009 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2010 2011coccicheck: 2012 $(Q)$(BASH) $(srctree)/scripts/$@ 2013 2014export_report: 2015 $(PERL) $(srctree)/scripts/export_report.pl 2016 2017PHONY += checkstack kernelrelease kernelversion image_name 2018 2019# UML needs a little special treatment here. It wants to use the host 2020# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2021# else wants $(ARCH), including people doing cross-builds, which means 2022# that $(SUBARCH) doesn't work here. 2023ifeq ($(ARCH), um) 2024CHECKSTACK_ARCH := $(SUBARCH) 2025else 2026CHECKSTACK_ARCH := $(ARCH) 2027endif 2028MINSTACKSIZE ?= 100 2029checkstack: 2030 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2031 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2032 2033kernelrelease: 2034 @$(filechk_kernel.release) 2035 2036kernelversion: 2037 @echo $(KERNELVERSION) 2038 2039image_name: 2040 @echo $(KBUILD_IMAGE) 2041 2042PHONY += run-command 2043run-command: 2044 $(Q)$(KBUILD_RUN_COMMAND) 2045 2046quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2047 cmd_rmfiles = rm -rf $(rm-files) 2048 2049# read saved command lines for existing targets 2050existing-targets := $(wildcard $(sort $(targets))) 2051 2052-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2053 2054endif # config-build 2055endif # mixed-build 2056endif # need-sub-make 2057 2058PHONY += FORCE 2059FORCE: 2060 2061# Declare the contents of the PHONY variable as phony. We keep that 2062# information in a variable so we can use it in if_changed and friends. 2063.PHONY: $(PHONY) 2064