1# SPDX-License-Identifier: GPL-2.0 2VERSION = 6 3PATCHLEVEL = 7 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# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 194# expand a shell special character '~'. We use a somewhat tedious way here. 195abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 196$(if $(abs_objtree),, \ 197 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 198 199# $(realpath ...) resolves symlinks 200abs_objtree := $(realpath $(abs_objtree)) 201endif # ifneq ($(KBUILD_OUTPUT),) 202 203ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 204$(error source directory cannot contain spaces or colons) 205endif 206 207ifneq ($(filter 3.%,$(MAKE_VERSION)),) 208# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 209# We need to invoke sub-make to avoid implicit rules in the top Makefile. 210need-sub-make := 1 211# Cancel implicit rules for this Makefile. 212$(this-makefile): ; 213endif 214 215export sub_make_done := 1 216 217endif # sub_make_done 218 219ifeq ($(abs_objtree),$(CURDIR)) 220# Suppress "Entering directory ..." if we are at the final work directory. 221no-print-directory := --no-print-directory 222else 223# Recursion to show "Entering directory ..." 224need-sub-make := 1 225endif 226 227ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),) 228# If --no-print-directory is unset, recurse once again to set it. 229# You may end up recursing into __sub-make twice. This is needed due to the 230# behavior change in GNU Make 4.4.1. 231need-sub-make := 1 232endif 233 234ifeq ($(need-sub-make),1) 235 236PHONY += $(MAKECMDGOALS) __sub-make 237 238$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 239 @: 240 241# Invoke a second make in the output directory, passing relevant variables 242__sub-make: 243 $(Q)$(MAKE) $(no-print-directory) -C $(abs_objtree) \ 244 -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 245 246else # need-sub-make 247 248# We process the rest of the Makefile if this is the final invocation of make 249 250ifeq ($(abs_srctree),$(abs_objtree)) 251 # building in the source tree 252 srctree := . 253 building_out_of_srctree := 254else 255 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 256 # building in a subdirectory of the source tree 257 srctree := .. 258 else 259 srctree := $(abs_srctree) 260 endif 261 building_out_of_srctree := 1 262endif 263 264ifneq ($(KBUILD_ABS_SRCTREE),) 265srctree := $(abs_srctree) 266endif 267 268objtree := . 269VPATH := $(srctree) 270 271export building_out_of_srctree srctree objtree VPATH 272 273# To make sure we do not include .config for any of the *config targets 274# catch them early, and hand them over to scripts/kconfig/Makefile 275# It is allowed to specify more targets when calling make, including 276# mixing *config targets and build targets. 277# For example 'make oldconfig all'. 278# Detect when mixed targets is specified, and make a second invocation 279# of make so .config is not included in this case either (for *config). 280 281version_h := include/generated/uapi/linux/version.h 282 283clean-targets := %clean mrproper cleandocs 284no-dot-config-targets := $(clean-targets) \ 285 cscope gtags TAGS tags help% %docs check% coccicheck \ 286 $(version_h) headers headers_% archheaders archscripts \ 287 %asm-generic kernelversion %src-pkg dt_binding_check \ 288 outputmakefile rustavailable rustfmt rustfmtcheck 289no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \ 290 image_name 291single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/ 292 293config-build := 294mixed-build := 295need-config := 1 296may-sync-config := 1 297single-build := 298 299ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 300 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 301 need-config := 302 endif 303endif 304 305ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 306 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 307 may-sync-config := 308 endif 309endif 310 311need-compiler := $(may-sync-config) 312 313ifneq ($(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=arm64 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=aarch64-linux-gnu- 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 453KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 454KBUILD_USERLDFLAGS := $(USERLDFLAGS) 455 456# These flags apply to all Rust code in the tree, including the kernel and 457# host programs. 458export rust_common_flags := --edition=2021 \ 459 -Zbinary_dep_depinfo=y \ 460 -Dunsafe_op_in_unsafe_fn -Drust_2018_idioms \ 461 -Dunreachable_pub -Dnon_ascii_idents \ 462 -Wmissing_docs \ 463 -Drustdoc::missing_crate_level_docs \ 464 -Dclippy::correctness -Dclippy::style \ 465 -Dclippy::suspicious -Dclippy::complexity \ 466 -Dclippy::perf \ 467 -Dclippy::let_unit_value -Dclippy::mut_mut \ 468 -Dclippy::needless_bitwise_bool \ 469 -Dclippy::needless_continue \ 470 -Dclippy::no_mangle_with_rust_abi \ 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 513PERL = perl 514PYTHON3 = python3 515CHECK = sparse 516BASH = bash 517KGZIP = gzip 518KBZIP2 = bzip2 519KLZOP = lzop 520LZMA = lzma 521LZ4 = lz4c 522XZ = xz 523ZSTD = zstd 524 525CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 526 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 527NOSTDINC_FLAGS := 528CFLAGS_MODULE = 529RUSTFLAGS_MODULE = 530AFLAGS_MODULE = 531LDFLAGS_MODULE = 532CFLAGS_KERNEL = 533RUSTFLAGS_KERNEL = 534AFLAGS_KERNEL = 535LDFLAGS_vmlinux = 536 537# Use USERINCLUDE when you must reference the UAPI directories only. 538USERINCLUDE := \ 539 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 540 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 541 -I$(srctree)/include/uapi \ 542 -I$(objtree)/include/generated/uapi \ 543 -include $(srctree)/include/linux/compiler-version.h \ 544 -include $(srctree)/include/linux/kconfig.h 545 546# Use LINUXINCLUDE when you must reference the include/ directory. 547# Needed to be compatible with the O= option 548LINUXINCLUDE := \ 549 -I$(srctree)/arch/$(SRCARCH)/include \ 550 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 551 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 552 -I$(objtree)/include \ 553 $(USERINCLUDE) 554 555KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 556 557KBUILD_CFLAGS := 558KBUILD_CFLAGS += -std=gnu11 559KBUILD_CFLAGS += -fshort-wchar 560KBUILD_CFLAGS += -funsigned-char 561KBUILD_CFLAGS += -fno-common 562KBUILD_CFLAGS += -fno-PIE 563KBUILD_CFLAGS += -fno-strict-aliasing 564 565KBUILD_CPPFLAGS := -D__KERNEL__ 566KBUILD_RUSTFLAGS := $(rust_common_flags) \ 567 --target=$(objtree)/scripts/target.json \ 568 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 569 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 570 -Csymbol-mangling-version=v0 \ 571 -Crelocation-model=static \ 572 -Zfunction-sections=n \ 573 -Dclippy::float_arithmetic 574 575KBUILD_AFLAGS_KERNEL := 576KBUILD_CFLAGS_KERNEL := 577KBUILD_RUSTFLAGS_KERNEL := 578KBUILD_AFLAGS_MODULE := -DMODULE 579KBUILD_CFLAGS_MODULE := -DMODULE 580KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 581KBUILD_LDFLAGS_MODULE := 582KBUILD_LDFLAGS := 583CLANG_FLAGS := 584 585ifeq ($(KBUILD_CLIPPY),1) 586 RUSTC_OR_CLIPPY_QUIET := CLIPPY 587 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 588else 589 RUSTC_OR_CLIPPY_QUIET := RUSTC 590 RUSTC_OR_CLIPPY = $(RUSTC) 591endif 592 593ifdef RUST_LIB_SRC 594 export RUST_LIB_SRC 595endif 596 597# Allows the usage of unstable features in stable compilers. 598export RUSTC_BOOTSTRAP := 1 599 600export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 601export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO 602export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 603export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 604export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 605export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 606export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 607export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 608 609export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 610export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 611export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 612export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 613export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 614export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 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 621 622# =========================================================================== 623# Rules shared between *config targets and build targets 624 625# Basic helpers built in scripts/basic/ 626PHONY += scripts_basic 627scripts_basic: 628 $(Q)$(MAKE) $(build)=scripts/basic 629 630PHONY += outputmakefile 631ifdef building_out_of_srctree 632# Before starting out-of-tree build, make sure the source tree is clean. 633# outputmakefile generates a Makefile in the output directory, if using a 634# separate output directory. This allows convenient use of make in the 635# output directory. 636# At the same time when output Makefile generated, generate .gitignore to 637# ignore whole output directory 638 639quiet_cmd_makefile = GEN Makefile 640 cmd_makefile = { \ 641 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 642 echo "include $(srctree)/Makefile"; \ 643 } > Makefile 644 645outputmakefile: 646 @if [ -f $(srctree)/.config -o \ 647 -d $(srctree)/include/config -o \ 648 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 649 echo >&2 "***"; \ 650 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 651 echo >&2 "*** in $(abs_srctree)";\ 652 echo >&2 "***"; \ 653 false; \ 654 fi 655 $(Q)ln -fsn $(srctree) source 656 $(call cmd,makefile) 657 $(Q)test -e .gitignore || \ 658 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 659endif 660 661# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 662# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 663# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 664# and from include/config/auto.conf.cmd to detect the compiler upgrade. 665CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 666 667ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 668include $(srctree)/scripts/Makefile.clang 669endif 670 671# Include this also for config targets because some architectures need 672# cc-cross-prefix to determine CROSS_COMPILE. 673ifdef need-compiler 674include $(srctree)/scripts/Makefile.compiler 675endif 676 677ifdef config-build 678# =========================================================================== 679# *config targets only - make sure prerequisites are updated, and descend 680# in scripts/kconfig to make the *config target 681 682# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 683# KBUILD_DEFCONFIG may point out an alternative default configuration 684# used for 'make defconfig' 685include $(srctree)/arch/$(SRCARCH)/Makefile 686export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 687 688config: outputmakefile scripts_basic FORCE 689 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 690 691%config: outputmakefile scripts_basic FORCE 692 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 693 694else #!config-build 695# =========================================================================== 696# Build targets only - this includes vmlinux, arch-specific targets, clean 697# targets and others. In general all targets except *config targets. 698 699# If building an external module we do not care about the all: rule 700# but instead __all depend on modules 701PHONY += all 702ifeq ($(KBUILD_EXTMOD),) 703__all: all 704else 705__all: modules 706endif 707 708targets := 709 710# Decide whether to build built-in, modular, or both. 711# Normally, just do built-in. 712 713KBUILD_MODULES := 714KBUILD_BUILTIN := 1 715 716# If we have only "make modules", don't compile built-in objects. 717ifeq ($(MAKECMDGOALS),modules) 718 KBUILD_BUILTIN := 719endif 720 721# If we have "make <whatever> modules", compile modules 722# in addition to whatever we do anyway. 723# Just "make" or "make all" shall build modules as well 724 725ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 726 KBUILD_MODULES := 1 727endif 728 729ifeq ($(MAKECMDGOALS),) 730 KBUILD_MODULES := 1 731endif 732 733export KBUILD_MODULES KBUILD_BUILTIN 734 735ifdef need-config 736include include/config/auto.conf 737endif 738 739ifeq ($(KBUILD_EXTMOD),) 740# Objects we will link into vmlinux / subdirs we need to visit 741core-y := 742drivers-y := 743libs-y := lib/ 744endif # KBUILD_EXTMOD 745 746# The all: target is the default when no target is given on the 747# command line. 748# This allow a user to issue only 'make' to build a kernel including modules 749# Defaults to vmlinux, but the arch makefile usually adds further targets 750all: vmlinux 751 752CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 753ifdef CONFIG_CC_IS_GCC 754CFLAGS_GCOV += -fno-tree-loop-im 755endif 756export CFLAGS_GCOV 757 758# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 759ifdef CONFIG_FUNCTION_TRACER 760 CC_FLAGS_FTRACE := -pg 761endif 762 763include $(srctree)/arch/$(SRCARCH)/Makefile 764 765ifdef need-config 766ifdef may-sync-config 767# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 768# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 769# because some architectures define CROSS_COMPILE there. 770include include/config/auto.conf.cmd 771 772$(KCONFIG_CONFIG): 773 @echo >&2 '***' 774 @echo >&2 '*** Configuration file "$@" not found!' 775 @echo >&2 '***' 776 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 777 @echo >&2 '*** "make menuconfig" or "make xconfig").' 778 @echo >&2 '***' 779 @/bin/false 780 781# The actual configuration files used during the build are stored in 782# include/generated/ and include/config/. Update them if .config is newer than 783# include/config/auto.conf (which mirrors .config). 784# 785# This exploits the 'multi-target pattern rule' trick. 786# The syncconfig should be executed only once to make all the targets. 787# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 788# 789# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 790# so you cannot notice that Kconfig is waiting for the user input. 791%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 792 $(Q)$(kecho) " SYNC $@" 793 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 794else # !may-sync-config 795# External modules and some install targets need include/generated/autoconf.h 796# and include/config/auto.conf but do not care if they are up-to-date. 797# Use auto.conf to trigger the test 798PHONY += include/config/auto.conf 799 800include/config/auto.conf: 801 @test -e include/generated/autoconf.h -a -e $@ || ( \ 802 echo >&2; \ 803 echo >&2 " ERROR: Kernel configuration is invalid."; \ 804 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 805 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 806 echo >&2 ; \ 807 /bin/false) 808 809endif # may-sync-config 810endif # need-config 811 812KBUILD_CFLAGS += -fno-delete-null-pointer-checks 813 814ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 815KBUILD_CFLAGS += -O2 816KBUILD_RUSTFLAGS += -Copt-level=2 817else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 818KBUILD_CFLAGS += -Os 819KBUILD_RUSTFLAGS += -Copt-level=s 820endif 821 822# Always set `debug-assertions` and `overflow-checks` because their default 823# depends on `opt-level` and `debug-assertions`, respectively. 824KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 825KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 826 827# Tell gcc to never replace conditional load with a non-conditional one 828ifdef CONFIG_CC_IS_GCC 829# gcc-10 renamed --param=allow-store-data-races=0 to 830# -fno-allow-store-data-races. 831KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 832KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 833endif 834 835ifdef CONFIG_READABLE_ASM 836# Disable optimizations that make assembler listings hard to read. 837# reorder blocks reorders the control in the function 838# ipa clone creates specialized cloned functions 839# partial inlining inlines only parts of functions 840KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 841endif 842 843stackp-flags-y := -fno-stack-protector 844stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 845stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 846 847KBUILD_CFLAGS += $(stackp-flags-y) 848 849KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings 850KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) 851 852ifdef CONFIG_FRAME_POINTER 853KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 854KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 855else 856# Some targets (ARM with Thumb2, for example), can't be built with frame 857# pointers. For those, we don't have FUNCTION_TRACER automatically 858# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 859# incompatible with -fomit-frame-pointer with current GCC, so we don't use 860# -fomit-frame-pointer with FUNCTION_TRACER. 861# In the Rust target specification, "frame-pointer" is set explicitly 862# to "may-omit". 863ifndef CONFIG_FUNCTION_TRACER 864KBUILD_CFLAGS += -fomit-frame-pointer 865endif 866endif 867 868# Initialize all stack variables with a 0xAA pattern. 869ifdef CONFIG_INIT_STACK_ALL_PATTERN 870KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 871endif 872 873# Initialize all stack variables with a zero value. 874ifdef CONFIG_INIT_STACK_ALL_ZERO 875KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 876ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 877# https://github.com/llvm/llvm-project/issues/44842 878CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 879export CC_AUTO_VAR_INIT_ZERO_ENABLER 880KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 881endif 882endif 883 884# While VLAs have been removed, GCC produces unreachable stack probes 885# for the randomize_kstack_offset feature. Disable it for all compilers. 886KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 887 888# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 889ifdef CONFIG_ZERO_CALL_USED_REGS 890KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 891endif 892 893ifdef CONFIG_FUNCTION_TRACER 894ifdef CONFIG_FTRACE_MCOUNT_USE_CC 895 CC_FLAGS_FTRACE += -mrecord-mcount 896 ifdef CONFIG_HAVE_NOP_MCOUNT 897 ifeq ($(call cc-option-yn, -mnop-mcount),y) 898 CC_FLAGS_FTRACE += -mnop-mcount 899 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 900 endif 901 endif 902endif 903ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 904 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 905 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 906 endif 907endif 908ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 909 ifdef CONFIG_HAVE_C_RECORDMCOUNT 910 BUILD_C_RECORDMCOUNT := y 911 export BUILD_C_RECORDMCOUNT 912 endif 913endif 914ifdef CONFIG_HAVE_FENTRY 915 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 916 ifeq ($(call cc-option-yn, -mfentry),y) 917 CC_FLAGS_FTRACE += -mfentry 918 CC_FLAGS_USING += -DCC_USING_FENTRY 919 endif 920endif 921export CC_FLAGS_FTRACE 922KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 923KBUILD_AFLAGS += $(CC_FLAGS_USING) 924endif 925 926# We trigger additional mismatches with less inlining 927ifdef CONFIG_DEBUG_SECTION_MISMATCH 928KBUILD_CFLAGS += -fno-inline-functions-called-once 929endif 930 931# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 932ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 933KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 934KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 935LDFLAGS_vmlinux += --gc-sections 936endif 937 938ifdef CONFIG_SHADOW_CALL_STACK 939ifndef CONFIG_DYNAMIC_SCS 940CC_FLAGS_SCS := -fsanitize=shadow-call-stack 941KBUILD_CFLAGS += $(CC_FLAGS_SCS) 942endif 943export CC_FLAGS_SCS 944endif 945 946ifdef CONFIG_LTO_CLANG 947ifdef CONFIG_LTO_CLANG_THIN 948CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 949KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache 950else 951CC_FLAGS_LTO := -flto 952endif 953CC_FLAGS_LTO += -fvisibility=hidden 954 955# Limit inlining across translation units to reduce binary size 956KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 957 958# Check for frame size exceeding threshold during prolog/epilog insertion 959# when using lld < 13.0.0. 960ifneq ($(CONFIG_FRAME_WARN),0) 961ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 130000),y) 962KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) 963endif 964endif 965endif 966 967ifdef CONFIG_LTO 968KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 969KBUILD_AFLAGS += -fno-lto 970export CC_FLAGS_LTO 971endif 972 973ifdef CONFIG_CFI_CLANG 974CC_FLAGS_CFI := -fsanitize=kcfi 975KBUILD_CFLAGS += $(CC_FLAGS_CFI) 976export CC_FLAGS_CFI 977endif 978 979ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 980KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 981endif 982 983# arch Makefile may override CC so keep this after arch Makefile is included 984NOSTDINC_FLAGS += -nostdinc 985 986# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 987# the kernel uses only C99 flexible arrays for dynamically sized trailing 988# arrays. Enforce this for everything that may examine structure sizes and 989# perform bounds checking. 990KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 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' 1587 @echo ' versioncheck - Sanity check on version.h usage' 1588 @echo ' includecheck - Check for duplicate included header files' 1589 @echo ' export_report - List the usages of all exported symbols' 1590 @echo ' headerdep - Detect inclusion cycles in headers' 1591 @echo ' coccicheck - Check with Coccinelle' 1592 @echo ' clang-analyzer - Check with clang static analyzer' 1593 @echo ' clang-tidy - Check with clang-tidy' 1594 @echo '' 1595 @echo 'Tools:' 1596 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1597 @echo '' 1598 @echo 'Kernel selftest:' 1599 @echo ' kselftest - Build and run kernel selftest' 1600 @echo ' Build, install, and boot kernel before' 1601 @echo ' running kselftest on it' 1602 @echo ' Run as root for full coverage' 1603 @echo ' kselftest-all - Build kernel selftest' 1604 @echo ' kselftest-install - Build and install kernel selftest' 1605 @echo ' kselftest-clean - Remove all generated kselftest files' 1606 @echo ' kselftest-merge - Merge all the config dependencies of' 1607 @echo ' kselftest to existing .config.' 1608 @echo '' 1609 @echo 'Rust targets:' 1610 @echo ' rustavailable - Checks whether the Rust toolchain is' 1611 @echo ' available and, if not, explains why.' 1612 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1613 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1614 @echo ' is formatted, printing a diff otherwise.' 1615 @echo ' rustdoc - Generate Rust documentation' 1616 @echo ' (requires kernel .config)' 1617 @echo ' rusttest - Runs the Rust tests' 1618 @echo ' (requires kernel .config; downloads external repos)' 1619 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1620 @echo ' (requires kernel .config)' 1621 @echo ' dir/file.[os] - Build specified target only' 1622 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1623 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1624 @echo ' The output is not intended to be compilable.' 1625 @echo ' dir/file.ll - Build the LLVM assembly file' 1626 @echo '' 1627 @$(if $(dtstree), \ 1628 echo 'Devicetree:'; \ 1629 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1630 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1631 echo ' dt_binding_check - Validate device tree binding documents'; \ 1632 echo ' dtbs_check - Validate device tree source files';\ 1633 echo '') 1634 1635 @echo 'Userspace tools targets:' 1636 @echo ' use "make tools/help"' 1637 @echo ' or "cd tools; make help"' 1638 @echo '' 1639 @echo 'Kernel packaging:' 1640 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1641 @echo '' 1642 @echo 'Documentation targets:' 1643 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1644 @echo '' 1645 @echo 'Architecture-specific targets ($(SRCARCH)):' 1646 @$(or $(archhelp),\ 1647 echo ' No architecture-specific help defined for $(SRCARCH)') 1648 @echo '' 1649 @$(if $(boards), \ 1650 $(foreach b, $(boards), \ 1651 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1652 echo '') 1653 @$(if $(board-dirs), \ 1654 $(foreach b, $(board-dirs), \ 1655 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1656 printf " %-16s - Show all of the above\\n" help-boards; \ 1657 echo '') 1658 1659 @echo ' make V=n [targets] 1: verbose build' 1660 @echo ' 2: give reason for rebuild of target' 1661 @echo ' V=1 and V=2 can be combined with V=12' 1662 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1663 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1664 @echo ' (sparse by default)' 1665 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1666 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1667 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1668 @echo ' 1: warnings which may be relevant and do not occur too often' 1669 @echo ' 2: warnings which occur quite often but may still be relevant' 1670 @echo ' 3: more obscure warnings, can most likely be ignored' 1671 @echo ' c: extra checks in the configuration stage (Kconfig)' 1672 @echo ' e: warnings are being treated as errors' 1673 @echo ' Multiple levels can be combined with W=12 or W=123' 1674 @$(if $(dtstree), \ 1675 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1676 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1677 ) 1678 @echo '' 1679 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1680 @echo 'For further info see the ./README file' 1681 1682 1683help-board-dirs := $(addprefix help-,$(board-dirs)) 1684 1685help-boards: $(help-board-dirs) 1686 1687boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1688 1689$(help-board-dirs): help-%: 1690 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1691 @$(if $(boards-per-dir), \ 1692 $(foreach b, $(boards-per-dir), \ 1693 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1694 echo '') 1695 1696 1697# Documentation targets 1698# --------------------------------------------------------------------------- 1699DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1700 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs 1701PHONY += $(DOC_TARGETS) 1702$(DOC_TARGETS): 1703 $(Q)$(MAKE) $(build)=Documentation $@ 1704 1705 1706# Rust targets 1707# --------------------------------------------------------------------------- 1708 1709# "Is Rust available?" target 1710PHONY += rustavailable 1711rustavailable: 1712 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1713 1714# Documentation target 1715# 1716# Using the singular to avoid running afoul of `no-dot-config-targets`. 1717PHONY += rustdoc 1718rustdoc: prepare 1719 $(Q)$(MAKE) $(build)=rust $@ 1720 1721# Testing target 1722PHONY += rusttest 1723rusttest: prepare 1724 $(Q)$(MAKE) $(build)=rust $@ 1725 1726# Formatting targets 1727PHONY += rustfmt rustfmtcheck 1728 1729# We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream. 1730# 1731# We match using absolute paths since `find` does not resolve them 1732# when matching, which is a problem when e.g. `srctree` is `..`. 1733# We `grep` afterwards in order to remove the directory entry itself. 1734rustfmt: 1735 $(Q)find $(abs_srctree) -type f -name '*.rs' \ 1736 -o -path $(abs_srctree)/rust/alloc -prune \ 1737 -o -path $(abs_objtree)/rust/test -prune \ 1738 | grep -Fv $(abs_srctree)/rust/alloc \ 1739 | grep -Fv $(abs_objtree)/rust/test \ 1740 | grep -Fv generated \ 1741 | xargs $(RUSTFMT) $(rustfmt_flags) 1742 1743rustfmtcheck: rustfmt_flags = --check 1744rustfmtcheck: rustfmt 1745 1746# Misc 1747# --------------------------------------------------------------------------- 1748 1749PHONY += misc-check 1750misc-check: 1751 $(Q)$(srctree)/scripts/misc-check 1752 1753all: misc-check 1754 1755PHONY += scripts_gdb 1756scripts_gdb: prepare0 1757 $(Q)$(MAKE) $(build)=scripts/gdb 1758 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1759 1760ifdef CONFIG_GDB_SCRIPTS 1761all: scripts_gdb 1762endif 1763 1764else # KBUILD_EXTMOD 1765 1766filechk_kernel.release = echo $(KERNELRELEASE) 1767 1768### 1769# External module support. 1770# When building external modules the kernel used as basis is considered 1771# read-only, and no consistency checks are made and the make 1772# system is not used on the basis kernel. If updates are required 1773# in the basis kernel ordinary make commands (without M=...) must be used. 1774 1775# We are always building only modules. 1776KBUILD_BUILTIN := 1777KBUILD_MODULES := 1 1778 1779build-dir := $(KBUILD_EXTMOD) 1780 1781compile_commands.json: $(extmod_prefix)compile_commands.json 1782PHONY += compile_commands.json 1783 1784clean-dirs := $(KBUILD_EXTMOD) 1785clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1786 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1787 1788PHONY += prepare 1789# now expand this into a simple variable to reduce the cost of shell evaluations 1790prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1791prepare: 1792 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1793 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1794 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1795 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1796 fi 1797 1798PHONY += help 1799help: 1800 @echo ' Building external modules.' 1801 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1802 @echo '' 1803 @echo ' modules - default target, build the module(s)' 1804 @echo ' modules_install - install the module' 1805 @echo ' clean - remove generated files in module directory only' 1806 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 1807 @echo '' 1808 1809ifndef CONFIG_MODULES 1810modules modules_install: __external_modules_error 1811__external_modules_error: 1812 @echo >&2 '***' 1813 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 1814 @echo >&2 '*** You cannot build or install external modules.' 1815 @echo >&2 '***' 1816 @false 1817endif 1818 1819endif # KBUILD_EXTMOD 1820 1821# --------------------------------------------------------------------------- 1822# Modules 1823 1824PHONY += modules modules_install modules_sign modules_prepare 1825 1826modules_install: 1827 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 1828 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 1829 1830ifeq ($(CONFIG_MODULE_SIG),y) 1831# modules_sign is a subset of modules_install. 1832# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1833modules_sign: modules_install 1834 @: 1835else 1836modules_sign: 1837 @echo >&2 '***' 1838 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 1839 @echo >&2 '***' 1840 @false 1841endif 1842 1843ifdef CONFIG_MODULES 1844 1845$(MODORDER): $(build-dir) 1846 @: 1847 1848# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1849# This is solely useful to speed up test compiles. 1850modules: modpost 1851ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1852 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1853endif 1854 1855PHONY += modules_check 1856modules_check: $(MODORDER) 1857 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1858 1859else # CONFIG_MODULES 1860 1861modules: 1862 @: 1863 1864KBUILD_MODULES := 1865 1866endif # CONFIG_MODULES 1867 1868PHONY += modpost 1869modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 1870 $(if $(KBUILD_MODULES), modules_check) 1871 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1872 1873# Single targets 1874# --------------------------------------------------------------------------- 1875# To build individual files in subdirectories, you can do like this: 1876# 1877# make foo/bar/baz.s 1878# 1879# The supported suffixes for single-target are listed in 'single-targets' 1880# 1881# To build only under specific subdirectories, you can do like this: 1882# 1883# make foo/bar/baz/ 1884 1885ifdef single-build 1886 1887# .ko is special because modpost is needed 1888single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1889single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 1890 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 1891 1892$(single-ko): single_modules 1893 @: 1894$(single-no-ko): $(build-dir) 1895 @: 1896 1897# Remove MODORDER when done because it is not the real one. 1898PHONY += single_modules 1899single_modules: $(single-no-ko) modules_prepare 1900 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER) 1901 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1902ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1903 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1904endif 1905 $(Q)rm -f $(MODORDER) 1906 1907single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 1908 1909KBUILD_MODULES := 1 1910 1911endif 1912 1913# Preset locale variables to speed up the build process. Limit locale 1914# tweaks to this spot to avoid wrong language settings when running 1915# make menuconfig etc. 1916# Error messages still appears in the original language 1917PHONY += $(build-dir) 1918$(build-dir): prepare 1919 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 1920 1921clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1922PHONY += $(clean-dirs) clean 1923$(clean-dirs): 1924 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1925 1926clean: $(clean-dirs) 1927 $(call cmd,rmfiles) 1928 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1929 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 1930 -o -name '*.ko.*' \ 1931 -o -name '*.dtb' -o -name '*.dtbo' \ 1932 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 1933 -o -name '*.dt.yaml' \ 1934 -o -name '*.dwo' -o -name '*.lst' \ 1935 -o -name '*.su' -o -name '*.mod' \ 1936 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1937 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1938 -o -name '*.asn1.[ch]' \ 1939 -o -name '*.symtypes' -o -name 'modules.order' \ 1940 -o -name '*.c.[012]*.*' \ 1941 -o -name '*.ll' \ 1942 -o -name '*.gcno' \ 1943 -o -name '*.*.symversions' \) -type f -print \ 1944 -o -name '.tmp_*' -print \ 1945 | xargs rm -rf 1946 1947# Generate tags for editors 1948# --------------------------------------------------------------------------- 1949quiet_cmd_tags = GEN $@ 1950 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1951 1952tags TAGS cscope gtags: FORCE 1953 $(call cmd,tags) 1954 1955# IDE support targets 1956PHONY += rust-analyzer 1957rust-analyzer: 1958 $(Q)$(MAKE) $(build)=rust $@ 1959 1960# Script to generate missing namespace dependencies 1961# --------------------------------------------------------------------------- 1962 1963PHONY += nsdeps 1964nsdeps: export KBUILD_NSDEPS=1 1965nsdeps: modules 1966 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1967 1968# Clang Tooling 1969# --------------------------------------------------------------------------- 1970 1971quiet_cmd_gen_compile_commands = GEN $@ 1972 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1973 1974$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1975 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 1976 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1977 $(call if_changed,gen_compile_commands) 1978 1979targets += $(extmod_prefix)compile_commands.json 1980 1981PHONY += clang-tidy clang-analyzer 1982 1983ifdef CONFIG_CC_IS_CLANG 1984quiet_cmd_clang_tools = CHECK $< 1985 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1986 1987clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 1988 $(call cmd,clang_tools) 1989else 1990clang-tidy clang-analyzer: 1991 @echo "$@ requires CC=clang" >&2 1992 @false 1993endif 1994 1995# Scripts to check various things for consistency 1996# --------------------------------------------------------------------------- 1997 1998PHONY += includecheck versioncheck coccicheck export_report 1999 2000includecheck: 2001 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2002 -name '*.[hcS]' -type f -print | sort \ 2003 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2004 2005versioncheck: 2006 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2007 -name '*.[hcS]' -type f -print | sort \ 2008 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2009 2010coccicheck: 2011 $(Q)$(BASH) $(srctree)/scripts/$@ 2012 2013export_report: 2014 $(PERL) $(srctree)/scripts/export_report.pl 2015 2016PHONY += checkstack kernelrelease kernelversion image_name 2017 2018# UML needs a little special treatment here. It wants to use the host 2019# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2020# else wants $(ARCH), including people doing cross-builds, which means 2021# that $(SUBARCH) doesn't work here. 2022ifeq ($(ARCH), um) 2023CHECKSTACK_ARCH := $(SUBARCH) 2024else 2025CHECKSTACK_ARCH := $(ARCH) 2026endif 2027checkstack: 2028 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2029 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 2030 2031kernelrelease: 2032 @$(filechk_kernel.release) 2033 2034kernelversion: 2035 @echo $(KERNELVERSION) 2036 2037image_name: 2038 @echo $(KBUILD_IMAGE) 2039 2040PHONY += run-command 2041run-command: 2042 $(Q)$(KBUILD_RUN_COMMAND) 2043 2044quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2045 cmd_rmfiles = rm -rf $(rm-files) 2046 2047# read saved command lines for existing targets 2048existing-targets := $(wildcard $(sort $(targets))) 2049 2050-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2051 2052endif # config-build 2053endif # mixed-build 2054endif # need-sub-make 2055 2056PHONY += FORCE 2057FORCE: 2058 2059# Declare the contents of the PHONY variable as phony. We keep that 2060# information in a variable so we can use it in if_changed and friends. 2061.PHONY: $(PHONY) 2062