1# SPDX-License-Identifier: GPL-2.0 2VERSION = 6 3PATCHLEVEL = 15 4SUBLEVEL = 0 5EXTRAVERSION = -rc1 6NAME = Baby Opossum Posse 7 8# *DOCUMENTATION* 9# To see a list of typical targets execute "make help" 10# More info can be located in ./README 11# Comments in this file are targeted only to the developer, do not 12# expect to learn how to build the kernel reading this file. 13 14ifeq ($(filter output-sync,$(.FEATURES)),) 15$(error GNU Make >= 4.0 is required. Your Make version is $(MAKE_VERSION)) 16endif 17 18$(if $(filter __%, $(MAKECMDGOALS)), \ 19 $(error targets prefixed with '__' are only for internal use)) 20 21# That's our default target when none is given on the command line 22PHONY := __all 23__all: 24 25# We are using a recursive build, so we need to do a little thinking 26# to get the ordering right. 27# 28# Most importantly: sub-Makefiles should only ever modify files in 29# their own directory. If in some directory we have a dependency on 30# a file in another dir (which doesn't happen often, but it's often 31# unavoidable when linking the built-in.a targets which finally 32# turn into vmlinux), we will call a sub make in that other dir, and 33# after that we are sure that everything which is in that other dir 34# is now up to date. 35# 36# The only cases where we need to modify files which have global 37# effects are thus separated out and done before the recursive 38# descending is started. They are now explicitly listed as the 39# prepare rule. 40 41this-makefile := $(lastword $(MAKEFILE_LIST)) 42abs_srctree := $(realpath $(dir $(this-makefile))) 43abs_output := $(CURDIR) 44 45ifneq ($(sub_make_done),1) 46 47# Do not use make's built-in rules and variables 48# (this increases performance and avoids hard-to-debug behaviour) 49MAKEFLAGS += -rR 50 51# Avoid funny character set dependencies 52unexport LC_ALL 53LC_COLLATE=C 54LC_NUMERIC=C 55export LC_COLLATE LC_NUMERIC 56 57# Avoid interference with shell env settings 58unexport GREP_OPTIONS 59 60# Beautify output 61# --------------------------------------------------------------------------- 62# 63# Most of build commands in Kbuild start with "cmd_". You can optionally define 64# "quiet_cmd_*". If defined, the short log is printed. Otherwise, no log from 65# that command is printed by default. 66# 67# e.g.) 68# quiet_cmd_depmod = DEPMOD $(MODLIB) 69# cmd_depmod = $(srctree)/scripts/depmod.sh $(DEPMOD) $(KERNELRELEASE) 70# 71# A simple variant is to prefix commands with $(Q) - that's useful 72# for commands that shall be hidden in non-verbose mode. 73# 74# $(Q)$(MAKE) $(build)=scripts/basic 75# 76# If KBUILD_VERBOSE contains 1, the whole command is echoed. 77# If KBUILD_VERBOSE contains 2, the reason for rebuilding is printed. 78# 79# To put more focus on warnings, be less verbose as default 80# Use 'make V=1' to see the full commands 81 82ifeq ("$(origin V)", "command line") 83 KBUILD_VERBOSE = $(V) 84endif 85 86quiet = quiet_ 87Q = @ 88 89ifneq ($(findstring 1, $(KBUILD_VERBOSE)),) 90 quiet = 91 Q = 92endif 93 94# If the user is running make -s (silent mode), suppress echoing of 95# commands 96ifneq ($(findstring s,$(firstword -$(MAKEFLAGS))),) 97quiet=silent_ 98override KBUILD_VERBOSE := 99endif 100 101export quiet Q KBUILD_VERBOSE 102 103# Call a source code checker (by default, "sparse") as part of the 104# C compilation. 105# 106# Use 'make C=1' to enable checking of only re-compiled files. 107# Use 'make C=2' to enable checking of *all* source files, regardless 108# of whether they are re-compiled or not. 109# 110# See the file "Documentation/dev-tools/sparse.rst" for more details, 111# including where to get the "sparse" utility. 112 113ifeq ("$(origin C)", "command line") 114 KBUILD_CHECKSRC = $(C) 115endif 116ifndef KBUILD_CHECKSRC 117 KBUILD_CHECKSRC = 0 118endif 119 120export KBUILD_CHECKSRC 121 122# Enable "clippy" (a linter) as part of the Rust compilation. 123# 124# Use 'make CLIPPY=1' to enable it. 125ifeq ("$(origin CLIPPY)", "command line") 126 KBUILD_CLIPPY := $(CLIPPY) 127endif 128 129export KBUILD_CLIPPY 130 131# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 132# directory of external module to build. Setting M= takes precedence. 133ifeq ("$(origin M)", "command line") 134 KBUILD_EXTMOD := $(M) 135endif 136 137ifeq ("$(origin MO)", "command line") 138 KBUILD_EXTMOD_OUTPUT := $(MO) 139endif 140 141$(if $(word 2, $(KBUILD_EXTMOD)), \ 142 $(error building multiple external modules is not supported)) 143 144$(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \ 145 $(error module directory path cannot contain '$x'))) 146 147# Remove trailing slashes 148ifneq ($(filter %/, $(KBUILD_EXTMOD)),) 149KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) 150endif 151 152export KBUILD_EXTMOD 153 154ifeq ("$(origin W)", "command line") 155 KBUILD_EXTRA_WARN := $(W) 156endif 157 158export KBUILD_EXTRA_WARN 159 160# Kbuild will save output files in the current working directory. 161# This does not need to match to the root of the kernel source tree. 162# 163# For example, you can do this: 164# 165# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 166# 167# If you want to save output files in a different location, there are 168# two syntaxes to specify it. 169# 170# 1) O= 171# Use "make O=dir/to/store/output/files/" 172# 173# 2) Set KBUILD_OUTPUT 174# Set the environment variable KBUILD_OUTPUT to point to the output directory. 175# export KBUILD_OUTPUT=dir/to/store/output/files/; make 176# 177# The O= assignment takes precedence over the KBUILD_OUTPUT environment 178# variable. 179 180ifeq ("$(origin O)", "command line") 181 KBUILD_OUTPUT := $(O) 182endif 183 184ifdef KBUILD_EXTMOD 185 ifdef KBUILD_OUTPUT 186 objtree := $(realpath $(KBUILD_OUTPUT)) 187 $(if $(objtree),,$(error specified kernel directory "$(KBUILD_OUTPUT)" does not exist)) 188 else 189 objtree := $(abs_srctree) 190 endif 191 # If Make is invoked from the kernel directory (either kernel 192 # source directory or kernel build directory), external modules 193 # are built in $(KBUILD_EXTMOD) for backward compatibility, 194 # otherwise, built in the current directory. 195 output := $(or $(KBUILD_EXTMOD_OUTPUT),$(if $(filter $(CURDIR),$(objtree) $(abs_srctree)),$(KBUILD_EXTMOD))) 196 # KBUILD_EXTMOD might be a relative path. Remember its absolute path before 197 # Make changes the working directory. 198 srcroot := $(realpath $(KBUILD_EXTMOD)) 199 $(if $(srcroot),,$(error specified external module directory "$(KBUILD_EXTMOD)" does not exist)) 200else 201 objtree := . 202 output := $(KBUILD_OUTPUT) 203endif 204 205export objtree srcroot 206 207# Do we want to change the working directory? 208ifneq ($(output),) 209# $(realpath ...) gets empty if the path does not exist. Run 'mkdir -p' first. 210$(shell mkdir -p "$(output)") 211# $(realpath ...) resolves symlinks 212abs_output := $(realpath $(output)) 213$(if $(abs_output),,$(error failed to create output directory "$(output)")) 214endif 215 216ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 217$(error source directory cannot contain spaces or colons) 218endif 219 220export sub_make_done := 1 221 222endif # sub_make_done 223 224ifeq ($(abs_output),$(CURDIR)) 225# Suppress "Entering directory ..." if we are at the final work directory. 226no-print-directory := --no-print-directory 227else 228# Recursion to show "Entering directory ..." 229need-sub-make := 1 230endif 231 232ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),) 233# If --no-print-directory is unset, recurse once again to set it. 234# You may end up recursing into __sub-make twice. This is needed due to the 235# behavior change in GNU Make 4.4.1. 236need-sub-make := 1 237endif 238 239ifeq ($(need-sub-make),1) 240 241PHONY += $(MAKECMDGOALS) __sub-make 242 243$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 244 @: 245 246# Invoke a second make in the output directory, passing relevant variables 247__sub-make: 248 $(Q)$(MAKE) $(no-print-directory) -C $(abs_output) \ 249 -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 250 251else # need-sub-make 252 253# We process the rest of the Makefile if this is the final invocation of make 254 255ifndef KBUILD_EXTMOD 256srcroot := $(abs_srctree) 257endif 258 259ifeq ($(srcroot),$(CURDIR)) 260building_out_of_srctree := 261else 262export building_out_of_srctree := 1 263endif 264 265ifdef KBUILD_ABS_SRCTREE 266 # Do nothing. Use the absolute path. 267else ifeq ($(srcroot),$(CURDIR)) 268 # Building in the source. 269 srcroot := . 270else ifeq ($(srcroot)/,$(dir $(CURDIR))) 271 # Building in a subdirectory of the source. 272 srcroot := .. 273endif 274 275export srctree := $(if $(KBUILD_EXTMOD),$(abs_srctree),$(srcroot)) 276 277ifdef building_out_of_srctree 278export VPATH := $(srcroot) 279else 280VPATH := 281endif 282 283# To make sure we do not include .config for any of the *config targets 284# catch them early, and hand them over to scripts/kconfig/Makefile 285# It is allowed to specify more targets when calling make, including 286# mixing *config targets and build targets. 287# For example 'make oldconfig all'. 288# Detect when mixed targets is specified, and make a second invocation 289# of make so .config is not included in this case either (for *config). 290 291version_h := include/generated/uapi/linux/version.h 292 293clean-targets := %clean mrproper cleandocs 294no-dot-config-targets := $(clean-targets) \ 295 cscope gtags TAGS tags help% %docs check% coccicheck \ 296 $(version_h) headers headers_% archheaders archscripts \ 297 %asm-generic kernelversion %src-pkg dt_binding_check \ 298 outputmakefile rustavailable rustfmt rustfmtcheck 299no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \ 300 image_name 301single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %/ 302 303config-build := 304mixed-build := 305need-config := 1 306may-sync-config := 1 307single-build := 308 309ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 310 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 311 need-config := 312 endif 313endif 314 315ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 316 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 317 may-sync-config := 318 endif 319endif 320 321need-compiler := $(may-sync-config) 322 323ifneq ($(KBUILD_EXTMOD),) 324 may-sync-config := 325endif 326 327ifeq ($(KBUILD_EXTMOD),) 328 ifneq ($(filter %config,$(MAKECMDGOALS)),) 329 config-build := 1 330 ifneq ($(words $(MAKECMDGOALS)),1) 331 mixed-build := 1 332 endif 333 endif 334endif 335 336# We cannot build single targets and the others at the same time 337ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 338 single-build := 1 339 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 340 mixed-build := 1 341 endif 342endif 343 344# For "make -j clean all", "make -j mrproper defconfig all", etc. 345ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 346 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 347 mixed-build := 1 348 endif 349endif 350 351# install and modules_install need also be processed one by one 352ifneq ($(filter install,$(MAKECMDGOALS)),) 353 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 354 mixed-build := 1 355 endif 356endif 357 358ifdef mixed-build 359# =========================================================================== 360# We're called with mixed targets (*config and build targets). 361# Handle them one by one. 362 363PHONY += $(MAKECMDGOALS) __build_one_by_one 364 365$(MAKECMDGOALS): __build_one_by_one 366 @: 367 368__build_one_by_one: 369 $(Q)set -e; \ 370 for i in $(MAKECMDGOALS); do \ 371 $(MAKE) -f $(srctree)/Makefile $$i; \ 372 done 373 374else # !mixed-build 375 376include $(srctree)/scripts/Kbuild.include 377 378# Read KERNELRELEASE from include/config/kernel.release (if it exists) 379KERNELRELEASE = $(call read-file, $(objtree)/include/config/kernel.release) 380KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 381export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 382 383include $(srctree)/scripts/subarch.include 384 385# Cross compiling and selecting different set of gcc/bin-utils 386# --------------------------------------------------------------------------- 387# 388# When performing cross compilation for other architectures ARCH shall be set 389# to the target architecture. (See arch/* for the possibilities). 390# ARCH can be set during invocation of make: 391# make ARCH=arm64 392# Another way is to have ARCH set in the environment. 393# The default ARCH is the host where make is executed. 394 395# CROSS_COMPILE specify the prefix used for all executables used 396# during compilation. Only gcc and related bin-utils executables 397# are prefixed with $(CROSS_COMPILE). 398# CROSS_COMPILE can be set on the command line 399# make CROSS_COMPILE=aarch64-linux-gnu- 400# Alternatively CROSS_COMPILE can be set in the environment. 401# Default value for CROSS_COMPILE is not to prefix executables 402# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 403ARCH ?= $(SUBARCH) 404 405# Architecture as present in compile.h 406UTS_MACHINE := $(ARCH) 407SRCARCH := $(ARCH) 408 409# Additional ARCH settings for x86 410ifeq ($(ARCH),i386) 411 SRCARCH := x86 412endif 413ifeq ($(ARCH),x86_64) 414 SRCARCH := x86 415endif 416 417# Additional ARCH settings for sparc 418ifeq ($(ARCH),sparc32) 419 SRCARCH := sparc 420endif 421ifeq ($(ARCH),sparc64) 422 SRCARCH := sparc 423endif 424 425# Additional ARCH settings for parisc 426ifeq ($(ARCH),parisc64) 427 SRCARCH := parisc 428endif 429 430export cross_compiling := 431ifneq ($(SRCARCH),$(SUBARCH)) 432cross_compiling := 1 433endif 434 435KCONFIG_CONFIG ?= .config 436export KCONFIG_CONFIG 437 438# SHELL used by kbuild 439CONFIG_SHELL := sh 440 441HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 442HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 443HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 444 445ifneq ($(LLVM),) 446ifneq ($(filter %/,$(LLVM)),) 447LLVM_PREFIX := $(LLVM) 448else ifneq ($(filter -%,$(LLVM)),) 449LLVM_SUFFIX := $(LLVM) 450endif 451 452HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 453HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 454else 455HOSTCC = gcc 456HOSTCXX = g++ 457endif 458HOSTRUSTC = rustc 459HOSTPKG_CONFIG = pkg-config 460 461KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 462 -O2 -fomit-frame-pointer -std=gnu11 463KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 464KBUILD_USERLDFLAGS := $(USERLDFLAGS) 465 466# These flags apply to all Rust code in the tree, including the kernel and 467# host programs. 468export rust_common_flags := --edition=2021 \ 469 -Zbinary_dep_depinfo=y \ 470 -Astable_features \ 471 -Dnon_ascii_idents \ 472 -Dunsafe_op_in_unsafe_fn \ 473 -Wmissing_docs \ 474 -Wrust_2018_idioms \ 475 -Wunreachable_pub \ 476 -Wclippy::all \ 477 -Wclippy::ignored_unit_patterns \ 478 -Wclippy::mut_mut \ 479 -Wclippy::needless_bitwise_bool \ 480 -Aclippy::needless_lifetimes \ 481 -Wclippy::no_mangle_with_rust_abi \ 482 -Wclippy::undocumented_unsafe_blocks \ 483 -Wclippy::unnecessary_safety_comment \ 484 -Wclippy::unnecessary_safety_doc \ 485 -Wrustdoc::missing_crate_level_docs \ 486 -Wrustdoc::unescaped_backticks 487 488KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \ 489 $(HOSTCFLAGS) -I $(srctree)/scripts/include 490KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \ 491 -I $(srctree)/scripts/include 492KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 493 -Zallow-features= $(HOSTRUSTFLAGS) 494KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 495KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 496KBUILD_PROCMACROLDFLAGS := $(or $(PROCMACROLDFLAGS),$(KBUILD_HOSTLDFLAGS)) 497 498# Make variables (CC, etc...) 499CPP = $(CC) -E 500ifneq ($(LLVM),) 501CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 502LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 503AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 504NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 505OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 506OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 507READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 508STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 509else 510CC = $(CROSS_COMPILE)gcc 511LD = $(CROSS_COMPILE)ld 512AR = $(CROSS_COMPILE)ar 513NM = $(CROSS_COMPILE)nm 514OBJCOPY = $(CROSS_COMPILE)objcopy 515OBJDUMP = $(CROSS_COMPILE)objdump 516READELF = $(CROSS_COMPILE)readelf 517STRIP = $(CROSS_COMPILE)strip 518endif 519RUSTC = rustc 520RUSTDOC = rustdoc 521RUSTFMT = rustfmt 522CLIPPY_DRIVER = clippy-driver 523BINDGEN = bindgen 524PAHOLE = pahole 525RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 526LEX = flex 527YACC = bison 528AWK = awk 529INSTALLKERNEL := installkernel 530PERL = perl 531PYTHON3 = python3 532CHECK = sparse 533BASH = bash 534KGZIP = gzip 535KBZIP2 = bzip2 536KLZOP = lzop 537LZMA = lzma 538LZ4 = lz4 539XZ = xz 540ZSTD = zstd 541 542CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 543 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 544NOSTDINC_FLAGS := 545CFLAGS_MODULE = 546RUSTFLAGS_MODULE = 547AFLAGS_MODULE = 548LDFLAGS_MODULE = 549CFLAGS_KERNEL = 550RUSTFLAGS_KERNEL = 551AFLAGS_KERNEL = 552LDFLAGS_vmlinux = 553 554# Use USERINCLUDE when you must reference the UAPI directories only. 555USERINCLUDE := \ 556 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 557 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 558 -I$(srctree)/include/uapi \ 559 -I$(objtree)/include/generated/uapi \ 560 -include $(srctree)/include/linux/compiler-version.h \ 561 -include $(srctree)/include/linux/kconfig.h 562 563# Use LINUXINCLUDE when you must reference the include/ directory. 564# Needed to be compatible with the O= option 565LINUXINCLUDE := \ 566 -I$(srctree)/arch/$(SRCARCH)/include \ 567 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 568 -I$(srctree)/include \ 569 -I$(objtree)/include \ 570 $(USERINCLUDE) 571 572KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 573 574KBUILD_CFLAGS := 575KBUILD_CFLAGS += -std=gnu11 576KBUILD_CFLAGS += -fshort-wchar 577KBUILD_CFLAGS += -funsigned-char 578KBUILD_CFLAGS += -fno-common 579KBUILD_CFLAGS += -fno-PIE 580KBUILD_CFLAGS += -fno-strict-aliasing 581 582KBUILD_CPPFLAGS := -D__KERNEL__ 583KBUILD_RUSTFLAGS := $(rust_common_flags) \ 584 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 585 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 586 -Csymbol-mangling-version=v0 \ 587 -Crelocation-model=static \ 588 -Zfunction-sections=n \ 589 -Wclippy::float_arithmetic 590 591KBUILD_AFLAGS_KERNEL := 592KBUILD_CFLAGS_KERNEL := 593KBUILD_RUSTFLAGS_KERNEL := 594KBUILD_AFLAGS_MODULE := -DMODULE 595KBUILD_CFLAGS_MODULE := -DMODULE 596KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 597KBUILD_LDFLAGS_MODULE := 598KBUILD_LDFLAGS := 599CLANG_FLAGS := 600 601ifeq ($(KBUILD_CLIPPY),1) 602 RUSTC_OR_CLIPPY_QUIET := CLIPPY 603 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 604else 605 RUSTC_OR_CLIPPY_QUIET := RUSTC 606 RUSTC_OR_CLIPPY = $(RUSTC) 607endif 608 609# Allows the usage of unstable features in stable compilers. 610export RUSTC_BOOTSTRAP := 1 611 612# Allows finding `.clippy.toml` in out-of-srctree builds. 613export CLIPPY_CONF_DIR := $(srctree) 614 615export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 616export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN 617export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 618export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 619export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 620export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 621export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS KBUILD_PROCMACROLDFLAGS LDFLAGS_MODULE 622export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 623 624export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 625export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 626export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 627export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 628export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 629export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 630 631# Files to ignore in find ... statements 632 633export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 634 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 635 -prune -o 636 637# =========================================================================== 638# Rules shared between *config targets and build targets 639 640# Basic helpers built in scripts/basic/ 641PHONY += scripts_basic 642scripts_basic: 643 $(Q)$(MAKE) $(build)=scripts/basic 644 645PHONY += outputmakefile 646ifdef building_out_of_srctree 647# Before starting out-of-tree build, make sure the source tree is clean. 648# outputmakefile generates a Makefile in the output directory, if using a 649# separate output directory. This allows convenient use of make in the 650# output directory. 651# At the same time when output Makefile generated, generate .gitignore to 652# ignore whole output directory 653 654ifdef KBUILD_EXTMOD 655print_env_for_makefile = \ 656 echo "export KBUILD_OUTPUT = $(objtree)"; \ 657 echo "export KBUILD_EXTMOD = $(realpath $(srcroot))" ; \ 658 echo "export KBUILD_EXTMOD_OUTPUT = $(CURDIR)" 659else 660print_env_for_makefile = \ 661 echo "export KBUILD_OUTPUT = $(CURDIR)" 662endif 663 664quiet_cmd_makefile = GEN Makefile 665 cmd_makefile = { \ 666 echo "\# Automatically generated by $(abs_srctree)/Makefile: don't edit"; \ 667 $(print_env_for_makefile); \ 668 echo "include $(abs_srctree)/Makefile"; \ 669 } > Makefile 670 671outputmakefile: 672ifeq ($(KBUILD_EXTMOD),) 673 @if [ -f $(srctree)/.config -o \ 674 -d $(srctree)/include/config -o \ 675 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 676 echo >&2 "***"; \ 677 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 678 echo >&2 "*** in $(abs_srctree)";\ 679 echo >&2 "***"; \ 680 false; \ 681 fi 682else 683 @if [ -f $(srcroot)/modules.order ]; then \ 684 echo >&2 "***"; \ 685 echo >&2 "*** The external module source tree is not clean."; \ 686 echo >&2 "*** Please run 'make -C $(abs_srctree) M=$(realpath $(srcroot)) clean'"; \ 687 echo >&2 "***"; \ 688 false; \ 689 fi 690endif 691 $(Q)ln -fsn $(srcroot) source 692 $(call cmd,makefile) 693 $(Q)test -e .gitignore || \ 694 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 695endif 696 697# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 698# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 699# CC_VERSION_TEXT and RUSTC_VERSION_TEXT are referenced from Kconfig (so they 700# need export), and from include/config/auto.conf.cmd to detect the compiler 701# upgrade. 702CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 703RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null)) 704 705ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 706include $(srctree)/scripts/Makefile.clang 707endif 708 709# Include this also for config targets because some architectures need 710# cc-cross-prefix to determine CROSS_COMPILE. 711ifdef need-compiler 712include $(srctree)/scripts/Makefile.compiler 713endif 714 715ifdef config-build 716# =========================================================================== 717# *config targets only - make sure prerequisites are updated, and descend 718# in scripts/kconfig to make the *config target 719 720# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 721# KBUILD_DEFCONFIG may point out an alternative default configuration 722# used for 'make defconfig' 723include $(srctree)/arch/$(SRCARCH)/Makefile 724export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT RUSTC_VERSION_TEXT 725 726config: outputmakefile scripts_basic FORCE 727 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 728 729%config: outputmakefile scripts_basic FORCE 730 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 731 732else #!config-build 733# =========================================================================== 734# Build targets only - this includes vmlinux, arch-specific targets, clean 735# targets and others. In general all targets except *config targets. 736 737# If building an external module we do not care about the all: rule 738# but instead __all depend on modules 739PHONY += all 740ifeq ($(KBUILD_EXTMOD),) 741__all: all 742else 743__all: modules 744endif 745 746targets := 747 748# Decide whether to build built-in, modular, or both. 749# Normally, just do built-in. 750 751KBUILD_MODULES := 752KBUILD_BUILTIN := 1 753 754# If we have only "make modules", don't compile built-in objects. 755ifeq ($(MAKECMDGOALS),modules) 756 KBUILD_BUILTIN := 757endif 758 759# If we have "make <whatever> modules", compile modules 760# in addition to whatever we do anyway. 761# Just "make" or "make all" shall build modules as well 762 763ifneq ($(filter all modules nsdeps compile_commands.json clang-%,$(MAKECMDGOALS)),) 764 KBUILD_MODULES := 1 765endif 766 767ifeq ($(MAKECMDGOALS),) 768 KBUILD_MODULES := 1 769endif 770 771export KBUILD_MODULES KBUILD_BUILTIN 772 773ifdef need-config 774include $(objtree)/include/config/auto.conf 775endif 776 777ifeq ($(KBUILD_EXTMOD),) 778# Objects we will link into vmlinux / subdirs we need to visit 779core-y := 780drivers-y := 781libs-y := lib/ 782endif # KBUILD_EXTMOD 783 784# The all: target is the default when no target is given on the 785# command line. 786# This allow a user to issue only 'make' to build a kernel including modules 787# Defaults to vmlinux, but the arch makefile usually adds further targets 788all: vmlinux 789 790CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 791ifdef CONFIG_CC_IS_GCC 792CFLAGS_GCOV += -fno-tree-loop-im 793endif 794export CFLAGS_GCOV 795 796# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 797ifdef CONFIG_FUNCTION_TRACER 798 CC_FLAGS_FTRACE := -pg 799endif 800 801include $(srctree)/arch/$(SRCARCH)/Makefile 802 803ifdef need-config 804ifdef may-sync-config 805# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 806# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 807# because some architectures define CROSS_COMPILE there. 808include include/config/auto.conf.cmd 809 810$(KCONFIG_CONFIG): 811 @echo >&2 '***' 812 @echo >&2 '*** Configuration file "$@" not found!' 813 @echo >&2 '***' 814 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 815 @echo >&2 '*** "make menuconfig" or "make xconfig").' 816 @echo >&2 '***' 817 @/bin/false 818 819# The actual configuration files used during the build are stored in 820# include/generated/ and include/config/. Update them if .config is newer than 821# include/config/auto.conf (which mirrors .config). 822# 823# This exploits the 'multi-target pattern rule' trick. 824# The syncconfig should be executed only once to make all the targets. 825# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 826# 827# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 828# so you cannot notice that Kconfig is waiting for the user input. 829%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 830 $(Q)$(kecho) " SYNC $@" 831 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 832else # !may-sync-config 833# External modules and some install targets need include/generated/autoconf.h 834# and include/config/auto.conf but do not care if they are up-to-date. 835# Use auto.conf to show the error message 836 837checked-configs := $(addprefix $(objtree)/, include/generated/autoconf.h include/generated/rustc_cfg include/config/auto.conf) 838missing-configs := $(filter-out $(wildcard $(checked-configs)), $(checked-configs)) 839 840ifdef missing-configs 841PHONY += $(objtree)/include/config/auto.conf 842 843$(objtree)/include/config/auto.conf: 844 @echo >&2 '***' 845 @echo >&2 '*** ERROR: Kernel configuration is invalid. The following files are missing:' 846 @printf >&2 '*** - %s\n' $(missing-configs) 847 @echo >&2 '*** Run "make oldconfig && make prepare" on kernel source to fix it.' 848 @echo >&2 '***' 849 @/bin/false 850endif 851 852endif # may-sync-config 853endif # need-config 854 855KBUILD_CFLAGS += -fno-delete-null-pointer-checks 856 857ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 858KBUILD_CFLAGS += -O2 859KBUILD_RUSTFLAGS += -Copt-level=2 860else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 861KBUILD_CFLAGS += -Os 862KBUILD_RUSTFLAGS += -Copt-level=s 863endif 864 865# Always set `debug-assertions` and `overflow-checks` because their default 866# depends on `opt-level` and `debug-assertions`, respectively. 867KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 868KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 869 870# Tell gcc to never replace conditional load with a non-conditional one 871ifdef CONFIG_CC_IS_GCC 872# gcc-10 renamed --param=allow-store-data-races=0 to 873# -fno-allow-store-data-races. 874KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 875KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 876endif 877 878ifdef CONFIG_READABLE_ASM 879# Disable optimizations that make assembler listings hard to read. 880# reorder blocks reorders the control in the function 881# ipa clone creates specialized cloned functions 882# partial inlining inlines only parts of functions 883KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 884endif 885 886stackp-flags-y := -fno-stack-protector 887stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 888stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 889 890KBUILD_CFLAGS += $(stackp-flags-y) 891 892KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings 893KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) 894 895ifdef CONFIG_FRAME_POINTER 896KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 897KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 898else 899# Some targets (ARM with Thumb2, for example), can't be built with frame 900# pointers. For those, we don't have FUNCTION_TRACER automatically 901# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 902# incompatible with -fomit-frame-pointer with current GCC, so we don't use 903# -fomit-frame-pointer with FUNCTION_TRACER. 904# In the Rust target specification, "frame-pointer" is set explicitly 905# to "may-omit". 906ifndef CONFIG_FUNCTION_TRACER 907KBUILD_CFLAGS += -fomit-frame-pointer 908endif 909endif 910 911# Initialize all stack variables with a 0xAA pattern. 912ifdef CONFIG_INIT_STACK_ALL_PATTERN 913KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 914endif 915 916# Initialize all stack variables with a zero value. 917ifdef CONFIG_INIT_STACK_ALL_ZERO 918KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 919ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 920# https://github.com/llvm/llvm-project/issues/44842 921CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 922export CC_AUTO_VAR_INIT_ZERO_ENABLER 923KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 924endif 925endif 926 927# Explicitly clear padding bits during variable initialization 928KBUILD_CFLAGS += $(call cc-option,-fzero-init-padding-bits=all) 929 930# While VLAs have been removed, GCC produces unreachable stack probes 931# for the randomize_kstack_offset feature. Disable it for all compilers. 932KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 933 934# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 935ifdef CONFIG_ZERO_CALL_USED_REGS 936KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 937endif 938 939ifdef CONFIG_FUNCTION_TRACER 940ifdef CONFIG_FTRACE_MCOUNT_USE_CC 941 CC_FLAGS_FTRACE += -mrecord-mcount 942 ifdef CONFIG_HAVE_NOP_MCOUNT 943 ifeq ($(call cc-option-yn, -mnop-mcount),y) 944 CC_FLAGS_FTRACE += -mnop-mcount 945 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 946 endif 947 endif 948endif 949ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 950 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 951 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 952 endif 953endif 954ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 955 ifdef CONFIG_HAVE_C_RECORDMCOUNT 956 BUILD_C_RECORDMCOUNT := y 957 export BUILD_C_RECORDMCOUNT 958 endif 959endif 960ifdef CONFIG_HAVE_FENTRY 961 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 962 ifeq ($(call cc-option-yn, -mfentry),y) 963 CC_FLAGS_FTRACE += -mfentry 964 CC_FLAGS_USING += -DCC_USING_FENTRY 965 endif 966endif 967export CC_FLAGS_FTRACE 968KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 969KBUILD_AFLAGS += $(CC_FLAGS_USING) 970endif 971 972# We trigger additional mismatches with less inlining 973ifdef CONFIG_DEBUG_SECTION_MISMATCH 974KBUILD_CFLAGS += -fno-inline-functions-called-once 975endif 976 977# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 978ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 979KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 980KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 981LDFLAGS_vmlinux += --gc-sections 982endif 983 984ifdef CONFIG_SHADOW_CALL_STACK 985ifndef CONFIG_DYNAMIC_SCS 986CC_FLAGS_SCS := -fsanitize=shadow-call-stack 987KBUILD_CFLAGS += $(CC_FLAGS_SCS) 988KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack 989endif 990export CC_FLAGS_SCS 991endif 992 993ifdef CONFIG_LTO_CLANG 994ifdef CONFIG_LTO_CLANG_THIN 995CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 996else 997CC_FLAGS_LTO := -flto 998endif 999CC_FLAGS_LTO += -fvisibility=hidden 1000 1001# Limit inlining across translation units to reduce binary size 1002KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 1003endif 1004 1005ifdef CONFIG_LTO 1006KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 1007KBUILD_AFLAGS += -fno-lto 1008export CC_FLAGS_LTO 1009endif 1010 1011ifdef CONFIG_CFI_CLANG 1012CC_FLAGS_CFI := -fsanitize=kcfi 1013ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS 1014 CC_FLAGS_CFI += -fsanitize-cfi-icall-experimental-normalize-integers 1015endif 1016ifdef CONFIG_FINEIBT_BHI 1017 CC_FLAGS_CFI += -fsanitize-kcfi-arity 1018endif 1019ifdef CONFIG_RUST 1020 # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects 1021 # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS. 1022 RUSTC_FLAGS_CFI := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers 1023 KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI) 1024 export RUSTC_FLAGS_CFI 1025endif 1026KBUILD_CFLAGS += $(CC_FLAGS_CFI) 1027export CC_FLAGS_CFI 1028endif 1029 1030# Architectures can define flags to add/remove for floating-point support 1031CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT 1032export CC_FLAGS_FPU 1033export CC_FLAGS_NO_FPU 1034 1035ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 1036# Set the minimal function alignment. Use the newer GCC option 1037# -fmin-function-alignment if it is available, or fall back to -falign-funtions. 1038# See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. 1039ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT 1040KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) 1041else 1042KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 1043endif 1044endif 1045 1046# arch Makefile may override CC so keep this after arch Makefile is included 1047NOSTDINC_FLAGS += -nostdinc 1048 1049# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 1050# the kernel uses only C99 flexible arrays for dynamically sized trailing 1051# arrays. Enforce this for everything that may examine structure sizes and 1052# perform bounds checking. 1053KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 1054 1055#Currently, disable -Wstringop-overflow for GCC 11, globally. 1056KBUILD_CFLAGS-$(CONFIG_CC_NO_STRINGOP_OVERFLOW) += $(call cc-option, -Wno-stringop-overflow) 1057KBUILD_CFLAGS-$(CONFIG_CC_STRINGOP_OVERFLOW) += $(call cc-option, -Wstringop-overflow) 1058 1059# disable invalid "can't wrap" optimizations for signed / pointers 1060KBUILD_CFLAGS += -fno-strict-overflow 1061 1062# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1063KBUILD_CFLAGS += -fno-stack-check 1064 1065# conserve stack if available 1066ifdef CONFIG_CC_IS_GCC 1067KBUILD_CFLAGS += -fconserve-stack 1068endif 1069 1070# change __FILE__ to the relative path to the source directory 1071ifdef building_out_of_srctree 1072KBUILD_CPPFLAGS += $(call cc-option,-ffile-prefix-map=$(srcroot)/=) 1073KBUILD_RUSTFLAGS += --remap-path-prefix=$(srcroot)/= 1074endif 1075 1076# include additional Makefiles when needed 1077include-y := scripts/Makefile.extrawarn 1078include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1079include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1080include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1081include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1082include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1083include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1084include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1085include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1086include-$(CONFIG_AUTOFDO_CLANG) += scripts/Makefile.autofdo 1087include-$(CONFIG_PROPELLER_CLANG) += scripts/Makefile.propeller 1088include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1089 1090include $(addprefix $(srctree)/, $(include-y)) 1091 1092# scripts/Makefile.gcc-plugins is intentionally included last. 1093# Do not add $(call cc-option,...) below this line. When you build the kernel 1094# from the clean source tree, the GCC plugins do not exist at this point. 1095 1096# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1097KBUILD_CPPFLAGS += $(KCPPFLAGS) 1098KBUILD_AFLAGS += $(KAFLAGS) 1099KBUILD_CFLAGS += $(KCFLAGS) 1100KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1101 1102KBUILD_LDFLAGS_MODULE += --build-id=sha1 1103LDFLAGS_vmlinux += --build-id=sha1 1104 1105KBUILD_LDFLAGS += -z noexecstack 1106ifeq ($(CONFIG_LD_IS_BFD),y) 1107KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1108endif 1109 1110ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1111LDFLAGS_vmlinux += -X 1112endif 1113 1114ifeq ($(CONFIG_RELR),y) 1115# ld.lld before 15 did not support -z pack-relative-relocs. 1116LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1117endif 1118 1119# We never want expected sections to be placed heuristically by the 1120# linker. All sections should be explicitly named in the linker script. 1121ifdef CONFIG_LD_ORPHAN_WARN 1122LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1123endif 1124 1125ifneq ($(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS),) 1126LDFLAGS_vmlinux += --emit-relocs --discard-none 1127endif 1128 1129# Align the bit size of userspace programs with the kernel 1130KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1131KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1132 1133# userspace programs are linked via the compiler, use the correct linker 1134ifeq ($(CONFIG_CC_IS_CLANG)$(CONFIG_LD_IS_LLD),yy) 1135KBUILD_USERLDFLAGS += --ld-path=$(LD) 1136endif 1137 1138# make the checker run with the right architecture 1139CHECKFLAGS += --arch=$(ARCH) 1140 1141# insure the checker run with the right endianness 1142CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1143 1144# the checker needs the correct machine size 1145CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1146 1147# Default kernel image to build when no specific target is given. 1148# KBUILD_IMAGE may be overruled on the command line or 1149# set in the environment 1150# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1151# this default value 1152export KBUILD_IMAGE ?= vmlinux 1153 1154# 1155# INSTALL_PATH specifies where to place the updated kernel and system map 1156# images. Default is /boot, but you can set it to other values 1157export INSTALL_PATH ?= /boot 1158 1159# 1160# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1161# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1162# an argument if needed. Otherwise it defaults to the kernel install path 1163# 1164export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1165 1166# 1167# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1168# relocations required by build roots. This is not defined in the 1169# makefile but the argument can be passed to make if needed. 1170# 1171 1172MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1173export MODLIB 1174 1175PHONY += prepare0 1176 1177ifeq ($(KBUILD_EXTMOD),) 1178 1179build-dir := . 1180clean-dirs := $(sort . Documentation \ 1181 $(patsubst %/,%,$(filter %/, $(core-) \ 1182 $(drivers-) $(libs-)))) 1183 1184export ARCH_CORE := $(core-y) 1185export ARCH_LIB := $(filter %/, $(libs-y)) 1186export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1187# Externally visible symbols (used by link-vmlinux.sh) 1188 1189KBUILD_VMLINUX_OBJS := ./built-in.a 1190ifdef CONFIG_MODULES 1191KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1192KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1193else 1194KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1195endif 1196 1197export KBUILD_VMLINUX_LIBS 1198export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1199 1200ifdef CONFIG_TRIM_UNUSED_KSYMS 1201# For the kernel to actually contain only the needed exported symbols, 1202# we have to build modules as well to determine what those symbols are. 1203KBUILD_MODULES := 1 1204endif 1205 1206# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1207quiet_cmd_ar_vmlinux.a = AR $@ 1208 cmd_ar_vmlinux.a = \ 1209 rm -f $@; \ 1210 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1211 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1212 1213targets += vmlinux.a 1214vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1215 $(call if_changed,ar_vmlinux.a) 1216 1217PHONY += vmlinux_o 1218vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1219 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1220 1221vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1222 @: 1223 1224PHONY += vmlinux 1225# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1226# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1227# unrelated; the decompressors just happen to have the same base name, 1228# arch/*/boot/compressed/vmlinux. 1229# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1230# 1231# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1232# https://savannah.gnu.org/bugs/?61463 1233# For Make > 4.4, the following simple code will work: 1234# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1235vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1236vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1237vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1238 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1239 1240# The actual objects are generated when descending, 1241# make sure no implicit rule kicks in 1242$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1243 1244ifeq ($(origin KERNELRELEASE),file) 1245filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1246else 1247filechk_kernel.release = echo $(KERNELRELEASE) 1248endif 1249 1250# Store (new) KERNELRELEASE string in include/config/kernel.release 1251include/config/kernel.release: FORCE 1252 $(call filechk,kernel.release) 1253 1254# Additional helpers built in scripts/ 1255# Carefully list dependencies so we do not try to build scripts twice 1256# in parallel 1257PHONY += scripts 1258scripts: scripts_basic scripts_dtc 1259 $(Q)$(MAKE) $(build)=$(@) 1260 1261# Things we need to do before we recursively start building the kernel 1262# or the modules are listed in "prepare". 1263# A multi level approach is used. prepareN is processed before prepareN-1. 1264# archprepare is used in arch Makefiles and when processed asm symlink, 1265# version.h and scripts_basic is processed / created. 1266 1267PHONY += prepare archprepare 1268 1269archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1270 asm-generic $(version_h) include/generated/utsrelease.h \ 1271 include/generated/compile.h include/generated/autoconf.h \ 1272 include/generated/rustc_cfg remove-stale-files 1273 1274prepare0: archprepare 1275 $(Q)$(MAKE) $(build)=scripts/mod 1276 $(Q)$(MAKE) $(build)=. prepare 1277 1278# All the preparing.. 1279prepare: prepare0 1280ifdef CONFIG_RUST 1281 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1282 $(Q)$(MAKE) $(build)=rust 1283endif 1284 1285PHONY += remove-stale-files 1286remove-stale-files: 1287 $(Q)$(srctree)/scripts/remove-stale-files 1288 1289# Support for using generic headers in asm-generic 1290asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj 1291 1292PHONY += asm-generic uapi-asm-generic 1293asm-generic: uapi-asm-generic 1294 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1295 generic=include/asm-generic 1296uapi-asm-generic: 1297 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1298 generic=include/uapi/asm-generic 1299 1300# Generate some files 1301# --------------------------------------------------------------------------- 1302 1303# KERNELRELEASE can change from a few different places, meaning version.h 1304# needs to be updated, so this check is forced on all builds 1305 1306uts_len := 64 1307define filechk_utsrelease.h 1308 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1309 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1310 exit 1; \ 1311 fi; \ 1312 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1313endef 1314 1315define filechk_version.h 1316 if [ $(SUBLEVEL) -gt 255 ]; then \ 1317 echo \#define LINUX_VERSION_CODE $(shell \ 1318 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1319 else \ 1320 echo \#define LINUX_VERSION_CODE $(shell \ 1321 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1322 fi; \ 1323 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1324 ((c) > 255 ? 255 : (c)))'; \ 1325 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1326 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1327 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1328endef 1329 1330$(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1331$(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0) 1332$(version_h): FORCE 1333 $(call filechk,version.h) 1334 1335include/generated/utsrelease.h: include/config/kernel.release FORCE 1336 $(call filechk,utsrelease.h) 1337 1338filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1339 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1340 1341include/generated/compile.h: FORCE 1342 $(call filechk,compile.h) 1343 1344PHONY += headerdep 1345headerdep: 1346 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1347 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1348 1349# --------------------------------------------------------------------------- 1350# Kernel headers 1351 1352#Default location for installed headers 1353export INSTALL_HDR_PATH = $(objtree)/usr 1354 1355quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1356 cmd_headers_install = \ 1357 mkdir -p $(INSTALL_HDR_PATH); \ 1358 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1359 usr/include $(INSTALL_HDR_PATH) 1360 1361PHONY += headers_install 1362headers_install: headers 1363 $(call cmd,headers_install) 1364 1365PHONY += archheaders archscripts 1366 1367hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1368 1369PHONY += headers 1370headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1371ifdef HEADER_ARCH 1372 $(Q)$(MAKE) -f $(srctree)/Makefile HEADER_ARCH= SRCARCH=$(HEADER_ARCH) headers 1373else 1374 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1375 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1376endif 1377 1378ifdef CONFIG_HEADERS_INSTALL 1379prepare: headers 1380endif 1381 1382PHONY += scripts_unifdef 1383scripts_unifdef: scripts_basic 1384 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1385 1386PHONY += scripts_gen_packed_field_checks 1387scripts_gen_packed_field_checks: scripts_basic 1388 $(Q)$(MAKE) $(build)=scripts scripts/gen_packed_field_checks 1389 1390# --------------------------------------------------------------------------- 1391# Install 1392 1393# Many distributions have the custom install script, /sbin/installkernel. 1394# If DKMS is installed, 'make install' will eventually recurse back 1395# to this Makefile to build and install external modules. 1396# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1397 1398quiet_cmd_install = INSTALL $(INSTALL_PATH) 1399 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1400 1401# --------------------------------------------------------------------------- 1402# vDSO install 1403 1404PHONY += vdso_install 1405vdso_install: export INSTALL_FILES = $(vdso-install-y) 1406vdso_install: 1407 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1408 1409# --------------------------------------------------------------------------- 1410# Tools 1411 1412ifdef CONFIG_OBJTOOL 1413prepare: tools/objtool 1414endif 1415 1416ifdef CONFIG_BPF 1417ifdef CONFIG_DEBUG_INFO_BTF 1418prepare: tools/bpf/resolve_btfids 1419endif 1420endif 1421 1422# The tools build system is not a part of Kbuild and tends to introduce 1423# its own unique issues. If you need to integrate a new tool into Kbuild, 1424# please consider locating that tool outside the tools/ tree and using the 1425# standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry 1426# here. See Documentation/kbuild/makefiles.rst for details. 1427 1428PHONY += resolve_btfids_clean 1429 1430resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1431 1432# tools/bpf/resolve_btfids directory might not exist 1433# in output directory, skip its clean in that case 1434resolve_btfids_clean: 1435ifneq ($(wildcard $(resolve_btfids_O)),) 1436 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1437endif 1438 1439tools/: FORCE 1440 $(Q)mkdir -p $(objtree)/tools 1441 $(Q)$(MAKE) LDFLAGS= O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1442 1443tools/%: FORCE 1444 $(Q)mkdir -p $(objtree)/tools 1445 $(Q)$(MAKE) LDFLAGS= O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1446 1447# --------------------------------------------------------------------------- 1448# Kernel selftest 1449 1450PHONY += kselftest 1451kselftest: headers 1452 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1453 1454kselftest-%: headers FORCE 1455 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1456 1457PHONY += kselftest-merge 1458kselftest-merge: 1459 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1460 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1461 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1462 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1463 1464# --------------------------------------------------------------------------- 1465# Devicetree files 1466 1467ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1468dtstree := arch/$(SRCARCH)/boot/dts 1469endif 1470 1471ifneq ($(dtstree),) 1472 1473%.dtb: dtbs_prepare 1474 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1475 1476%.dtbo: dtbs_prepare 1477 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1478 1479PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1480dtbs: dtbs_prepare 1481 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1 1482 1483# include/config/kernel.release is actually needed when installing DTBs because 1484# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1485# dtbs_install depend on it as dtbs_install may run as root. 1486dtbs_prepare: include/config/kernel.release scripts_dtc 1487 1488ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1489export CHECK_DTBS=y 1490endif 1491 1492ifneq ($(CHECK_DTBS),) 1493dtbs_prepare: dt_binding_schemas 1494endif 1495 1496dtbs_check: dtbs 1497 1498dtbs_install: 1499 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) 1500 1501ifdef CONFIG_OF_EARLY_FLATTREE 1502all: dtbs 1503endif 1504 1505ifdef CONFIG_GENERIC_BUILTIN_DTB 1506vmlinux: dtbs 1507endif 1508 1509endif 1510 1511PHONY += scripts_dtc 1512scripts_dtc: scripts_basic 1513 $(Q)$(MAKE) $(build)=scripts/dtc 1514 1515ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1516export CHECK_DTBS=y 1517endif 1518 1519PHONY += dt_binding_check dt_binding_schemas 1520dt_binding_check: dt_binding_schemas scripts_dtc 1521 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1522 1523dt_binding_schemas: 1524 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1525 1526PHONY += dt_compatible_check 1527dt_compatible_check: dt_binding_schemas 1528 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1529 1530# --------------------------------------------------------------------------- 1531# Modules 1532 1533ifdef CONFIG_MODULES 1534 1535# By default, build modules as well 1536 1537all: modules 1538 1539# When we're building modules with modversions, we need to consider 1540# the built-in objects during the descend as well, in order to 1541# make sure the checksums are up to date before we record them. 1542ifdef CONFIG_MODVERSIONS 1543 KBUILD_BUILTIN := 1 1544endif 1545 1546# Build modules 1547# 1548 1549# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1550# is an exception. 1551ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1552KBUILD_BUILTIN := 1 1553modules: vmlinux 1554endif 1555 1556modules: modules_prepare 1557 1558# Target to prepare building external modules 1559modules_prepare: prepare 1560 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1561 1562endif # CONFIG_MODULES 1563 1564### 1565# Cleaning is done on three levels. 1566# make clean Delete most generated files 1567# Leave enough to build external modules 1568# make mrproper Delete the current configuration, and all generated files 1569# make distclean Remove editor backup files, patch leftover files and the like 1570 1571# Directories & files removed with 'make clean' 1572CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1573 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1574 modules.builtin.ranges vmlinux.o.map vmlinux.unstripped \ 1575 compile_commands.json rust/test \ 1576 rust-project.json .vmlinux.objs .vmlinux.export.c \ 1577 .builtin-dtbs-list .builtin-dtb.S 1578 1579# Directories & files removed with 'make mrproper' 1580MRPROPER_FILES += include/config include/generated \ 1581 arch/$(SRCARCH)/include/generated .objdiff \ 1582 debian snap tar-install PKGBUILD pacman \ 1583 .config .config.old .version \ 1584 Module.symvers \ 1585 certs/signing_key.pem \ 1586 certs/x509.genkey \ 1587 vmlinux-gdb.py \ 1588 rpmbuild \ 1589 rust/libmacros.so rust/libmacros.dylib 1590 1591# clean - Delete most, but leave enough to build external modules 1592# 1593clean: private rm-files := $(CLEAN_FILES) 1594 1595PHONY += archclean vmlinuxclean 1596 1597vmlinuxclean: 1598 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1599 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1600 1601clean: archclean vmlinuxclean resolve_btfids_clean 1602 1603# mrproper - Delete all generated files, including .config 1604# 1605mrproper: private rm-files := $(MRPROPER_FILES) 1606mrproper-dirs := $(addprefix _mrproper_,scripts) 1607 1608PHONY += $(mrproper-dirs) mrproper 1609$(mrproper-dirs): 1610 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1611 1612mrproper: clean $(mrproper-dirs) 1613 $(call cmd,rmfiles) 1614 @find . $(RCS_FIND_IGNORE) \ 1615 \( -name '*.rmeta' \) \ 1616 -type f -print | xargs rm -f 1617 1618# distclean 1619# 1620PHONY += distclean 1621 1622distclean: mrproper 1623 @find . $(RCS_FIND_IGNORE) \ 1624 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1625 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1626 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1627 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1628 -type f -print | xargs rm -f 1629 1630 1631# Packaging of the kernel to various formats 1632# --------------------------------------------------------------------------- 1633 1634%src-pkg: FORCE 1635 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1636%pkg: include/config/kernel.release FORCE 1637 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1638 1639# Brief documentation of the typical targets used 1640# --------------------------------------------------------------------------- 1641 1642boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1643boards := $(sort $(notdir $(boards))) 1644board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1645board-dirs := $(sort $(notdir $(board-dirs:/=))) 1646 1647PHONY += help 1648help: 1649 @echo 'Cleaning targets:' 1650 @echo ' clean - Remove most generated files but keep the config and' 1651 @echo ' enough build support to build external modules' 1652 @echo ' mrproper - Remove all generated files + config + various backup files' 1653 @echo ' distclean - mrproper + remove editor backup and patch files' 1654 @echo '' 1655 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1656 @echo '' 1657 @echo 'Other generic targets:' 1658 @echo ' all - Build all targets marked with [*]' 1659 @echo '* vmlinux - Build the bare kernel' 1660 @echo '* modules - Build all modules' 1661 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1662 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1663 @echo ' dir/ - Build all files in dir and below' 1664 @echo ' dir/file.[ois] - Build specified target only' 1665 @echo ' dir/file.ll - Build the LLVM assembly file' 1666 @echo ' (requires compiler support for LLVM assembly generation)' 1667 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1668 @echo ' (requires a recent binutils and recent build (System.map))' 1669 @echo ' dir/file.ko - Build module including final link' 1670 @echo ' modules_prepare - Set up for building external modules' 1671 @echo ' tags/TAGS - Generate tags file for editors' 1672 @echo ' cscope - Generate cscope index' 1673 @echo ' gtags - Generate GNU GLOBAL index' 1674 @echo ' kernelrelease - Output the release version string (use with make -s)' 1675 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1676 @echo ' image_name - Output the image name (use with make -s)' 1677 @echo ' headers - Build ready-to-install UAPI headers in usr/include' 1678 @echo ' headers_install - Install sanitised kernel UAPI headers to INSTALL_HDR_PATH'; \ 1679 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1680 echo '' 1681 @echo 'Static analysers:' 1682 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1683 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1684 @echo ' versioncheck - Sanity check on version.h usage' 1685 @echo ' includecheck - Check for duplicate included header files' 1686 @echo ' headerdep - Detect inclusion cycles in headers' 1687 @echo ' coccicheck - Check with Coccinelle' 1688 @echo ' clang-analyzer - Check with clang static analyzer' 1689 @echo ' clang-tidy - Check with clang-tidy' 1690 @echo '' 1691 @echo 'Tools:' 1692 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1693 @echo '' 1694 @echo 'Kernel selftest:' 1695 @echo ' kselftest - Build and run kernel selftest' 1696 @echo ' Build, install, and boot kernel before' 1697 @echo ' running kselftest on it' 1698 @echo ' Run as root for full coverage' 1699 @echo ' kselftest-all - Build kernel selftest' 1700 @echo ' kselftest-install - Build and install kernel selftest' 1701 @echo ' kselftest-clean - Remove all generated kselftest files' 1702 @echo ' kselftest-merge - Merge all the config dependencies of' 1703 @echo ' kselftest to existing .config.' 1704 @echo '' 1705 @echo 'Rust targets:' 1706 @echo ' rustavailable - Checks whether the Rust toolchain is' 1707 @echo ' available and, if not, explains why.' 1708 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1709 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1710 @echo ' is formatted, printing a diff otherwise.' 1711 @echo ' rustdoc - Generate Rust documentation' 1712 @echo ' (requires kernel .config)' 1713 @echo ' rusttest - Runs the Rust tests' 1714 @echo ' (requires kernel .config; downloads external repos)' 1715 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1716 @echo ' (requires kernel .config)' 1717 @echo ' dir/file.[os] - Build specified target only' 1718 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1719 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1720 @echo ' The output is not intended to be compilable.' 1721 @echo ' dir/file.ll - Build the LLVM assembly file' 1722 @echo '' 1723 @$(if $(dtstree), \ 1724 echo 'Devicetree:'; \ 1725 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1726 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1727 echo ' dt_binding_check - Validate device tree binding documents and examples'; \ 1728 echo ' dt_binding_schemas - Build processed device tree binding schemas'; \ 1729 echo ' dtbs_check - Validate device tree source files';\ 1730 echo '') 1731 1732 @echo 'Userspace tools targets:' 1733 @echo ' use "make tools/help"' 1734 @echo ' or "cd tools; make help"' 1735 @echo '' 1736 @echo 'Kernel packaging:' 1737 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1738 @echo '' 1739 @echo 'Documentation targets:' 1740 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1741 @echo '' 1742 @echo 'Architecture-specific targets ($(SRCARCH)):' 1743 @$(or $(archhelp),\ 1744 echo ' No architecture-specific help defined for $(SRCARCH)') 1745 @echo '' 1746 @$(if $(boards), \ 1747 $(foreach b, $(boards), \ 1748 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1749 echo '') 1750 @$(if $(board-dirs), \ 1751 $(foreach b, $(board-dirs), \ 1752 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1753 printf " %-16s - Show all of the above\\n" help-boards; \ 1754 echo '') 1755 1756 @echo ' make V=n [targets] 1: verbose build' 1757 @echo ' 2: give reason for rebuild of target' 1758 @echo ' V=1 and V=2 can be combined with V=12' 1759 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1760 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1761 @echo ' (sparse by default)' 1762 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1763 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1764 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where' 1765 @echo ' 1: warnings which may be relevant and do not occur too often' 1766 @echo ' 2: warnings which occur quite often but may still be relevant' 1767 @echo ' 3: more obscure warnings, can most likely be ignored' 1768 @echo ' c: extra checks in the configuration stage (Kconfig)' 1769 @echo ' e: warnings are being treated as errors' 1770 @echo ' Multiple levels can be combined with W=12 or W=123' 1771 @$(if $(dtstree), \ 1772 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1773 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1774 ) 1775 @echo '' 1776 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1777 @echo 'For further info see the ./README file' 1778 1779 1780help-board-dirs := $(addprefix help-,$(board-dirs)) 1781 1782help-boards: $(help-board-dirs) 1783 1784boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1785 1786$(help-board-dirs): help-%: 1787 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1788 @$(if $(boards-per-dir), \ 1789 $(foreach b, $(boards-per-dir), \ 1790 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1791 echo '') 1792 1793 1794# Documentation targets 1795# --------------------------------------------------------------------------- 1796DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1797 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs 1798PHONY += $(DOC_TARGETS) 1799$(DOC_TARGETS): 1800 $(Q)$(MAKE) $(build)=Documentation $@ 1801 1802 1803# Rust targets 1804# --------------------------------------------------------------------------- 1805 1806# "Is Rust available?" target 1807PHONY += rustavailable 1808rustavailable: 1809 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1810 1811# Documentation target 1812# 1813# Using the singular to avoid running afoul of `no-dot-config-targets`. 1814PHONY += rustdoc 1815rustdoc: prepare 1816 $(Q)$(MAKE) $(build)=rust $@ 1817 1818# Testing target 1819PHONY += rusttest 1820rusttest: prepare 1821 $(Q)$(MAKE) $(build)=rust $@ 1822 1823# Formatting targets 1824PHONY += rustfmt rustfmtcheck 1825 1826rustfmt: 1827 $(Q)find $(srctree) $(RCS_FIND_IGNORE) \ 1828 -type f -a -name '*.rs' -a ! -name '*generated*' -print \ 1829 | xargs $(RUSTFMT) $(rustfmt_flags) 1830 1831rustfmtcheck: rustfmt_flags = --check 1832rustfmtcheck: rustfmt 1833 1834# Misc 1835# --------------------------------------------------------------------------- 1836 1837PHONY += misc-check 1838misc-check: 1839 $(Q)$(srctree)/scripts/misc-check 1840 1841all: misc-check 1842 1843PHONY += scripts_gdb 1844scripts_gdb: prepare0 1845 $(Q)$(MAKE) $(build)=scripts/gdb 1846 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1847 1848ifdef CONFIG_GDB_SCRIPTS 1849all: scripts_gdb 1850endif 1851 1852else # KBUILD_EXTMOD 1853 1854filechk_kernel.release = echo $(KERNELRELEASE) 1855 1856### 1857# External module support. 1858# When building external modules the kernel used as basis is considered 1859# read-only, and no consistency checks are made and the make 1860# system is not used on the basis kernel. If updates are required 1861# in the basis kernel ordinary make commands (without M=...) must be used. 1862 1863# We are always building only modules. 1864KBUILD_BUILTIN := 1865KBUILD_MODULES := 1 1866 1867build-dir := . 1868 1869clean-dirs := . 1870clean: private rm-files := Module.symvers modules.nsdeps compile_commands.json 1871 1872PHONY += prepare 1873# now expand this into a simple variable to reduce the cost of shell evaluations 1874prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1875prepare: 1876 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1877 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1878 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1879 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1880 fi 1881 1882PHONY += help 1883help: 1884 @echo ' Building external modules.' 1885 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1886 @echo '' 1887 @echo ' modules - default target, build the module(s)' 1888 @echo ' modules_install - install the module' 1889 @echo ' clean - remove generated files in module directory only' 1890 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 1891 @echo '' 1892 1893ifndef CONFIG_MODULES 1894modules modules_install: __external_modules_error 1895__external_modules_error: 1896 @echo >&2 '***' 1897 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 1898 @echo >&2 '*** You cannot build or install external modules.' 1899 @echo >&2 '***' 1900 @false 1901endif 1902 1903endif # KBUILD_EXTMOD 1904 1905# --------------------------------------------------------------------------- 1906# Modules 1907 1908PHONY += modules modules_install modules_sign modules_prepare 1909 1910modules_install: 1911 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 1912 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 1913 1914ifeq ($(CONFIG_MODULE_SIG),y) 1915# modules_sign is a subset of modules_install. 1916# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1917modules_sign: modules_install 1918 @: 1919else 1920modules_sign: 1921 @echo >&2 '***' 1922 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 1923 @echo >&2 '***' 1924 @false 1925endif 1926 1927ifdef CONFIG_MODULES 1928 1929modules.order: $(build-dir) 1930 @: 1931 1932# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1933# This is solely useful to speed up test compiles. 1934modules: modpost 1935ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1936 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1937endif 1938 1939PHONY += modules_check 1940modules_check: modules.order 1941 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1942 1943else # CONFIG_MODULES 1944 1945modules: 1946 @: 1947 1948KBUILD_MODULES := 1949 1950endif # CONFIG_MODULES 1951 1952PHONY += modpost 1953modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 1954 $(if $(KBUILD_MODULES), modules_check) 1955 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1956 1957# Single targets 1958# --------------------------------------------------------------------------- 1959# To build individual files in subdirectories, you can do like this: 1960# 1961# make foo/bar/baz.s 1962# 1963# The supported suffixes for single-target are listed in 'single-targets' 1964# 1965# To build only under specific subdirectories, you can do like this: 1966# 1967# make foo/bar/baz/ 1968 1969ifdef single-build 1970 1971# .ko is special because modpost is needed 1972single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1973single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 1974 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 1975 1976$(single-ko): single_modules 1977 @: 1978$(single-no-ko): $(build-dir) 1979 @: 1980 1981# Remove modules.order when done because it is not the real one. 1982PHONY += single_modules 1983single_modules: $(single-no-ko) modules_prepare 1984 $(Q){ $(foreach m, $(single-ko), echo $(m:%.ko=%.o);) } > modules.order 1985 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1986ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1987 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1988endif 1989 $(Q)rm -f modules.order 1990 1991single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 1992 1993KBUILD_MODULES := 1 1994 1995endif 1996 1997prepare: outputmakefile 1998 1999# Preset locale variables to speed up the build process. Limit locale 2000# tweaks to this spot to avoid wrong language settings when running 2001# make menuconfig etc. 2002# Error messages still appears in the original language 2003PHONY += $(build-dir) 2004$(build-dir): prepare 2005 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 2006 2007clean-dirs := $(addprefix _clean_, $(clean-dirs)) 2008PHONY += $(clean-dirs) clean 2009$(clean-dirs): 2010 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 2011 2012clean: $(clean-dirs) 2013 $(call cmd,rmfiles) 2014 @find . $(RCS_FIND_IGNORE) \ 2015 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 2016 -o -name '*.ko.*' \ 2017 -o -name '*.dtb' -o -name '*.dtbo' \ 2018 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 2019 -o -name '*.dt.yaml' -o -name 'dtbs-list' \ 2020 -o -name '*.dwo' -o -name '*.lst' \ 2021 -o -name '*.su' -o -name '*.mod' \ 2022 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 2023 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 2024 -o -name '*.asn1.[ch]' \ 2025 -o -name '*.symtypes' -o -name 'modules.order' \ 2026 -o -name '*.c.[012]*.*' \ 2027 -o -name '*.ll' \ 2028 -o -name '*.gcno' \ 2029 \) -type f -print \ 2030 -o -name '.tmp_*' -print \ 2031 | xargs rm -rf 2032 2033# Generate tags for editors 2034# --------------------------------------------------------------------------- 2035quiet_cmd_tags = GEN $@ 2036 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 2037 2038tags TAGS cscope gtags: FORCE 2039 $(call cmd,tags) 2040 2041# Generate rust-project.json (a file that describes the structure of non-Cargo 2042# Rust projects) for rust-analyzer (an implementation of the Language Server 2043# Protocol). 2044PHONY += rust-analyzer 2045rust-analyzer: 2046 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 2047ifdef KBUILD_EXTMOD 2048# FIXME: external modules must not descend into a sub-directory of the kernel 2049 $(Q)$(MAKE) $(build)=$(objtree)/rust src=$(srctree)/rust $@ 2050else 2051 $(Q)$(MAKE) $(build)=rust $@ 2052endif 2053 2054# Script to generate missing namespace dependencies 2055# --------------------------------------------------------------------------- 2056 2057PHONY += nsdeps 2058nsdeps: export KBUILD_NSDEPS=1 2059nsdeps: modules 2060 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 2061 2062# Clang Tooling 2063# --------------------------------------------------------------------------- 2064 2065quiet_cmd_gen_compile_commands = GEN $@ 2066 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2067 2068compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \ 2069 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2070 $(if $(CONFIG_MODULES), modules.order) FORCE 2071 $(call if_changed,gen_compile_commands) 2072 2073targets += compile_commands.json 2074 2075PHONY += clang-tidy clang-analyzer 2076 2077ifdef CONFIG_CC_IS_CLANG 2078quiet_cmd_clang_tools = CHECK $< 2079 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2080 2081clang-tidy clang-analyzer: compile_commands.json 2082 $(call cmd,clang_tools) 2083else 2084clang-tidy clang-analyzer: 2085 @echo "$@ requires CC=clang" >&2 2086 @false 2087endif 2088 2089# Scripts to check various things for consistency 2090# --------------------------------------------------------------------------- 2091 2092PHONY += includecheck versioncheck coccicheck 2093 2094includecheck: 2095 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2096 -name '*.[hcS]' -type f -print | sort \ 2097 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2098 2099versioncheck: 2100 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2101 -name '*.[hcS]' -type f -print | sort \ 2102 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2103 2104coccicheck: 2105 $(Q)$(BASH) $(srctree)/scripts/$@ 2106 2107PHONY += checkstack kernelrelease kernelversion image_name 2108 2109# UML needs a little special treatment here. It wants to use the host 2110# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2111# else wants $(ARCH), including people doing cross-builds, which means 2112# that $(SUBARCH) doesn't work here. 2113ifeq ($(ARCH), um) 2114CHECKSTACK_ARCH := $(SUBARCH) 2115else 2116CHECKSTACK_ARCH := $(ARCH) 2117endif 2118MINSTACKSIZE ?= 100 2119checkstack: 2120 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2121 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2122 2123kernelrelease: 2124 @$(filechk_kernel.release) 2125 2126kernelversion: 2127 @echo $(KERNELVERSION) 2128 2129image_name: 2130 @echo $(KBUILD_IMAGE) 2131 2132PHONY += run-command 2133run-command: 2134 $(Q)$(KBUILD_RUN_COMMAND) 2135 2136quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2137 cmd_rmfiles = rm -rf $(rm-files) 2138 2139# read saved command lines for existing targets 2140existing-targets := $(wildcard $(sort $(targets))) 2141 2142-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2143 2144endif # config-build 2145endif # mixed-build 2146endif # need-sub-make 2147 2148PHONY += FORCE 2149FORCE: 2150 2151# Declare the contents of the PHONY variable as phony. We keep that 2152# information in a variable so we can use it in if_changed and friends. 2153.PHONY: $(PHONY) 2154