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 -Wclippy::needless_continue \ 481 -Aclippy::needless_lifetimes \ 482 -Wclippy::no_mangle_with_rust_abi \ 483 -Wclippy::undocumented_unsafe_blocks \ 484 -Wclippy::unnecessary_safety_comment \ 485 -Wclippy::unnecessary_safety_doc \ 486 -Wrustdoc::missing_crate_level_docs \ 487 -Wrustdoc::unescaped_backticks 488 489KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \ 490 $(HOSTCFLAGS) -I $(srctree)/scripts/include 491KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \ 492 -I $(srctree)/scripts/include 493KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 494 -Zallow-features= $(HOSTRUSTFLAGS) 495KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 496KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 497KBUILD_PROCMACROLDFLAGS := $(or $(PROCMACROLDFLAGS),$(KBUILD_HOSTLDFLAGS)) 498 499# Make variables (CC, etc...) 500CPP = $(CC) -E 501ifneq ($(LLVM),) 502CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 503LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 504AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 505NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 506OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 507OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 508READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 509STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 510else 511CC = $(CROSS_COMPILE)gcc 512LD = $(CROSS_COMPILE)ld 513AR = $(CROSS_COMPILE)ar 514NM = $(CROSS_COMPILE)nm 515OBJCOPY = $(CROSS_COMPILE)objcopy 516OBJDUMP = $(CROSS_COMPILE)objdump 517READELF = $(CROSS_COMPILE)readelf 518STRIP = $(CROSS_COMPILE)strip 519endif 520RUSTC = rustc 521RUSTDOC = rustdoc 522RUSTFMT = rustfmt 523CLIPPY_DRIVER = clippy-driver 524BINDGEN = bindgen 525PAHOLE = pahole 526RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 527LEX = flex 528YACC = bison 529AWK = awk 530INSTALLKERNEL := installkernel 531PERL = perl 532PYTHON3 = python3 533CHECK = sparse 534BASH = bash 535KGZIP = gzip 536KBZIP2 = bzip2 537KLZOP = lzop 538LZMA = lzma 539LZ4 = lz4 540XZ = xz 541ZSTD = zstd 542 543CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 544 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 545NOSTDINC_FLAGS := 546CFLAGS_MODULE = 547RUSTFLAGS_MODULE = 548AFLAGS_MODULE = 549LDFLAGS_MODULE = 550CFLAGS_KERNEL = 551RUSTFLAGS_KERNEL = 552AFLAGS_KERNEL = 553LDFLAGS_vmlinux = 554 555# Use USERINCLUDE when you must reference the UAPI directories only. 556USERINCLUDE := \ 557 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 558 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 559 -I$(srctree)/include/uapi \ 560 -I$(objtree)/include/generated/uapi \ 561 -include $(srctree)/include/linux/compiler-version.h \ 562 -include $(srctree)/include/linux/kconfig.h 563 564# Use LINUXINCLUDE when you must reference the include/ directory. 565# Needed to be compatible with the O= option 566LINUXINCLUDE := \ 567 -I$(srctree)/arch/$(SRCARCH)/include \ 568 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 569 -I$(srctree)/include \ 570 -I$(objtree)/include \ 571 $(USERINCLUDE) 572 573KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 574 575KBUILD_CFLAGS := 576KBUILD_CFLAGS += -std=gnu11 577KBUILD_CFLAGS += -fshort-wchar 578KBUILD_CFLAGS += -funsigned-char 579KBUILD_CFLAGS += -fno-common 580KBUILD_CFLAGS += -fno-PIE 581KBUILD_CFLAGS += -fno-strict-aliasing 582 583KBUILD_CPPFLAGS := -D__KERNEL__ 584KBUILD_RUSTFLAGS := $(rust_common_flags) \ 585 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 586 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 587 -Csymbol-mangling-version=v0 \ 588 -Crelocation-model=static \ 589 -Zfunction-sections=n \ 590 -Wclippy::float_arithmetic 591 592KBUILD_AFLAGS_KERNEL := 593KBUILD_CFLAGS_KERNEL := 594KBUILD_RUSTFLAGS_KERNEL := 595KBUILD_AFLAGS_MODULE := -DMODULE 596KBUILD_CFLAGS_MODULE := -DMODULE 597KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 598KBUILD_LDFLAGS_MODULE := 599KBUILD_LDFLAGS := 600CLANG_FLAGS := 601 602ifeq ($(KBUILD_CLIPPY),1) 603 RUSTC_OR_CLIPPY_QUIET := CLIPPY 604 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 605else 606 RUSTC_OR_CLIPPY_QUIET := RUSTC 607 RUSTC_OR_CLIPPY = $(RUSTC) 608endif 609 610# Allows the usage of unstable features in stable compilers. 611export RUSTC_BOOTSTRAP := 1 612 613# Allows finding `.clippy.toml` in out-of-srctree builds. 614export CLIPPY_CONF_DIR := $(srctree) 615 616export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 617export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN 618export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 619export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 620export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 621export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 622export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS KBUILD_PROCMACROLDFLAGS LDFLAGS_MODULE 623export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 624 625export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 626export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 627export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 628export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 629export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 630export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 631 632# Files to ignore in find ... statements 633 634export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 635 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 636 -prune -o 637 638# =========================================================================== 639# Rules shared between *config targets and build targets 640 641# Basic helpers built in scripts/basic/ 642PHONY += scripts_basic 643scripts_basic: 644 $(Q)$(MAKE) $(build)=scripts/basic 645 646PHONY += outputmakefile 647ifdef building_out_of_srctree 648# Before starting out-of-tree build, make sure the source tree is clean. 649# outputmakefile generates a Makefile in the output directory, if using a 650# separate output directory. This allows convenient use of make in the 651# output directory. 652# At the same time when output Makefile generated, generate .gitignore to 653# ignore whole output directory 654 655ifdef KBUILD_EXTMOD 656print_env_for_makefile = \ 657 echo "export KBUILD_OUTPUT = $(objtree)"; \ 658 echo "export KBUILD_EXTMOD = $(realpath $(srcroot))" ; \ 659 echo "export KBUILD_EXTMOD_OUTPUT = $(CURDIR)" 660else 661print_env_for_makefile = \ 662 echo "export KBUILD_OUTPUT = $(CURDIR)" 663endif 664 665quiet_cmd_makefile = GEN Makefile 666 cmd_makefile = { \ 667 echo "\# Automatically generated by $(abs_srctree)/Makefile: don't edit"; \ 668 $(print_env_for_makefile); \ 669 echo "include $(abs_srctree)/Makefile"; \ 670 } > Makefile 671 672outputmakefile: 673ifeq ($(KBUILD_EXTMOD),) 674 @if [ -f $(srctree)/.config -o \ 675 -d $(srctree)/include/config -o \ 676 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 677 echo >&2 "***"; \ 678 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 679 echo >&2 "*** in $(abs_srctree)";\ 680 echo >&2 "***"; \ 681 false; \ 682 fi 683else 684 @if [ -f $(srcroot)/modules.order ]; then \ 685 echo >&2 "***"; \ 686 echo >&2 "*** The external module source tree is not clean."; \ 687 echo >&2 "*** Please run 'make -C $(abs_srctree) M=$(realpath $(srcroot)) clean'"; \ 688 echo >&2 "***"; \ 689 false; \ 690 fi 691endif 692 $(Q)ln -fsn $(srcroot) source 693 $(call cmd,makefile) 694 $(Q)test -e .gitignore || \ 695 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 696endif 697 698# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 699# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 700# CC_VERSION_TEXT and RUSTC_VERSION_TEXT are referenced from Kconfig (so they 701# need export), and from include/config/auto.conf.cmd to detect the compiler 702# upgrade. 703CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 704RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null)) 705 706ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 707include $(srctree)/scripts/Makefile.clang 708endif 709 710# Include this also for config targets because some architectures need 711# cc-cross-prefix to determine CROSS_COMPILE. 712ifdef need-compiler 713include $(srctree)/scripts/Makefile.compiler 714endif 715 716ifdef config-build 717# =========================================================================== 718# *config targets only - make sure prerequisites are updated, and descend 719# in scripts/kconfig to make the *config target 720 721# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 722# KBUILD_DEFCONFIG may point out an alternative default configuration 723# used for 'make defconfig' 724include $(srctree)/arch/$(SRCARCH)/Makefile 725export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT RUSTC_VERSION_TEXT 726 727config: outputmakefile scripts_basic FORCE 728 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 729 730%config: outputmakefile scripts_basic FORCE 731 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 732 733else #!config-build 734# =========================================================================== 735# Build targets only - this includes vmlinux, arch-specific targets, clean 736# targets and others. In general all targets except *config targets. 737 738# If building an external module we do not care about the all: rule 739# but instead __all depend on modules 740PHONY += all 741ifeq ($(KBUILD_EXTMOD),) 742__all: all 743else 744__all: modules 745endif 746 747targets := 748 749# Decide whether to build built-in, modular, or both. 750# Normally, just do built-in. 751 752KBUILD_MODULES := 753KBUILD_BUILTIN := 1 754 755# If we have only "make modules", don't compile built-in objects. 756ifeq ($(MAKECMDGOALS),modules) 757 KBUILD_BUILTIN := 758endif 759 760# If we have "make <whatever> modules", compile modules 761# in addition to whatever we do anyway. 762# Just "make" or "make all" shall build modules as well 763 764ifneq ($(filter all modules nsdeps compile_commands.json clang-%,$(MAKECMDGOALS)),) 765 KBUILD_MODULES := 1 766endif 767 768ifeq ($(MAKECMDGOALS),) 769 KBUILD_MODULES := 1 770endif 771 772export KBUILD_MODULES KBUILD_BUILTIN 773 774ifdef need-config 775include $(objtree)/include/config/auto.conf 776endif 777 778ifeq ($(KBUILD_EXTMOD),) 779# Objects we will link into vmlinux / subdirs we need to visit 780core-y := 781drivers-y := 782libs-y := lib/ 783endif # KBUILD_EXTMOD 784 785# The all: target is the default when no target is given on the 786# command line. 787# This allow a user to issue only 'make' to build a kernel including modules 788# Defaults to vmlinux, but the arch makefile usually adds further targets 789all: vmlinux 790 791CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 792ifdef CONFIG_CC_IS_GCC 793CFLAGS_GCOV += -fno-tree-loop-im 794endif 795export CFLAGS_GCOV 796 797# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 798ifdef CONFIG_FUNCTION_TRACER 799 CC_FLAGS_FTRACE := -pg 800endif 801 802include $(srctree)/arch/$(SRCARCH)/Makefile 803 804ifdef need-config 805ifdef may-sync-config 806# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 807# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 808# because some architectures define CROSS_COMPILE there. 809include include/config/auto.conf.cmd 810 811$(KCONFIG_CONFIG): 812 @echo >&2 '***' 813 @echo >&2 '*** Configuration file "$@" not found!' 814 @echo >&2 '***' 815 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 816 @echo >&2 '*** "make menuconfig" or "make xconfig").' 817 @echo >&2 '***' 818 @/bin/false 819 820# The actual configuration files used during the build are stored in 821# include/generated/ and include/config/. Update them if .config is newer than 822# include/config/auto.conf (which mirrors .config). 823# 824# This exploits the 'multi-target pattern rule' trick. 825# The syncconfig should be executed only once to make all the targets. 826# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 827# 828# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 829# so you cannot notice that Kconfig is waiting for the user input. 830%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 831 $(Q)$(kecho) " SYNC $@" 832 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 833else # !may-sync-config 834# External modules and some install targets need include/generated/autoconf.h 835# and include/config/auto.conf but do not care if they are up-to-date. 836# Use auto.conf to show the error message 837 838checked-configs := $(addprefix $(objtree)/, include/generated/autoconf.h include/generated/rustc_cfg include/config/auto.conf) 839missing-configs := $(filter-out $(wildcard $(checked-configs)), $(checked-configs)) 840 841ifdef missing-configs 842PHONY += $(objtree)/include/config/auto.conf 843 844$(objtree)/include/config/auto.conf: 845 @echo >&2 '***' 846 @echo >&2 '*** ERROR: Kernel configuration is invalid. The following files are missing:' 847 @printf >&2 '*** - %s\n' $(missing-configs) 848 @echo >&2 '*** Run "make oldconfig && make prepare" on kernel source to fix it.' 849 @echo >&2 '***' 850 @/bin/false 851endif 852 853endif # may-sync-config 854endif # need-config 855 856KBUILD_CFLAGS += -fno-delete-null-pointer-checks 857 858ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 859KBUILD_CFLAGS += -O2 860KBUILD_RUSTFLAGS += -Copt-level=2 861else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 862KBUILD_CFLAGS += -Os 863KBUILD_RUSTFLAGS += -Copt-level=s 864endif 865 866# Always set `debug-assertions` and `overflow-checks` because their default 867# depends on `opt-level` and `debug-assertions`, respectively. 868KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 869KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 870 871# Tell gcc to never replace conditional load with a non-conditional one 872ifdef CONFIG_CC_IS_GCC 873# gcc-10 renamed --param=allow-store-data-races=0 to 874# -fno-allow-store-data-races. 875KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 876KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 877endif 878 879ifdef CONFIG_READABLE_ASM 880# Disable optimizations that make assembler listings hard to read. 881# reorder blocks reorders the control in the function 882# ipa clone creates specialized cloned functions 883# partial inlining inlines only parts of functions 884KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 885endif 886 887stackp-flags-y := -fno-stack-protector 888stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 889stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 890 891KBUILD_CFLAGS += $(stackp-flags-y) 892 893KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings 894KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) 895 896ifdef CONFIG_FRAME_POINTER 897KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 898KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 899else 900# Some targets (ARM with Thumb2, for example), can't be built with frame 901# pointers. For those, we don't have FUNCTION_TRACER automatically 902# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 903# incompatible with -fomit-frame-pointer with current GCC, so we don't use 904# -fomit-frame-pointer with FUNCTION_TRACER. 905# In the Rust target specification, "frame-pointer" is set explicitly 906# to "may-omit". 907ifndef CONFIG_FUNCTION_TRACER 908KBUILD_CFLAGS += -fomit-frame-pointer 909endif 910endif 911 912# Initialize all stack variables with a 0xAA pattern. 913ifdef CONFIG_INIT_STACK_ALL_PATTERN 914KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 915endif 916 917# Initialize all stack variables with a zero value. 918ifdef CONFIG_INIT_STACK_ALL_ZERO 919KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 920ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 921# https://github.com/llvm/llvm-project/issues/44842 922CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 923export CC_AUTO_VAR_INIT_ZERO_ENABLER 924KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 925endif 926endif 927 928# Explicitly clear padding bits during variable initialization 929KBUILD_CFLAGS += $(call cc-option,-fzero-init-padding-bits=all) 930 931# While VLAs have been removed, GCC produces unreachable stack probes 932# for the randomize_kstack_offset feature. Disable it for all compilers. 933KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 934 935# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 936ifdef CONFIG_ZERO_CALL_USED_REGS 937KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 938endif 939 940ifdef CONFIG_FUNCTION_TRACER 941ifdef CONFIG_FTRACE_MCOUNT_USE_CC 942 CC_FLAGS_FTRACE += -mrecord-mcount 943 ifdef CONFIG_HAVE_NOP_MCOUNT 944 ifeq ($(call cc-option-yn, -mnop-mcount),y) 945 CC_FLAGS_FTRACE += -mnop-mcount 946 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 947 endif 948 endif 949endif 950ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 951 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 952 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 953 endif 954endif 955ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 956 ifdef CONFIG_HAVE_C_RECORDMCOUNT 957 BUILD_C_RECORDMCOUNT := y 958 export BUILD_C_RECORDMCOUNT 959 endif 960endif 961ifdef CONFIG_HAVE_FENTRY 962 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 963 ifeq ($(call cc-option-yn, -mfentry),y) 964 CC_FLAGS_FTRACE += -mfentry 965 CC_FLAGS_USING += -DCC_USING_FENTRY 966 endif 967endif 968export CC_FLAGS_FTRACE 969KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 970KBUILD_AFLAGS += $(CC_FLAGS_USING) 971endif 972 973# We trigger additional mismatches with less inlining 974ifdef CONFIG_DEBUG_SECTION_MISMATCH 975KBUILD_CFLAGS += -fno-inline-functions-called-once 976endif 977 978# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 979ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 980KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 981KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 982LDFLAGS_vmlinux += --gc-sections 983endif 984 985ifdef CONFIG_SHADOW_CALL_STACK 986ifndef CONFIG_DYNAMIC_SCS 987CC_FLAGS_SCS := -fsanitize=shadow-call-stack 988KBUILD_CFLAGS += $(CC_FLAGS_SCS) 989KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack 990endif 991export CC_FLAGS_SCS 992endif 993 994ifdef CONFIG_LTO_CLANG 995ifdef CONFIG_LTO_CLANG_THIN 996CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 997else 998CC_FLAGS_LTO := -flto 999endif 1000CC_FLAGS_LTO += -fvisibility=hidden 1001 1002# Limit inlining across translation units to reduce binary size 1003KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 1004endif 1005 1006ifdef CONFIG_LTO 1007KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 1008KBUILD_AFLAGS += -fno-lto 1009export CC_FLAGS_LTO 1010endif 1011 1012ifdef CONFIG_CFI_CLANG 1013CC_FLAGS_CFI := -fsanitize=kcfi 1014ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS 1015 CC_FLAGS_CFI += -fsanitize-cfi-icall-experimental-normalize-integers 1016endif 1017ifdef CONFIG_FINEIBT_BHI 1018 CC_FLAGS_CFI += -fsanitize-kcfi-arity 1019endif 1020ifdef CONFIG_RUST 1021 # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects 1022 # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS. 1023 RUSTC_FLAGS_CFI := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers 1024 KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI) 1025 export RUSTC_FLAGS_CFI 1026endif 1027KBUILD_CFLAGS += $(CC_FLAGS_CFI) 1028export CC_FLAGS_CFI 1029endif 1030 1031# Architectures can define flags to add/remove for floating-point support 1032CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT 1033export CC_FLAGS_FPU 1034export CC_FLAGS_NO_FPU 1035 1036ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 1037# Set the minimal function alignment. Use the newer GCC option 1038# -fmin-function-alignment if it is available, or fall back to -falign-funtions. 1039# See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. 1040ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT 1041KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) 1042else 1043KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 1044endif 1045endif 1046 1047# arch Makefile may override CC so keep this after arch Makefile is included 1048NOSTDINC_FLAGS += -nostdinc 1049 1050# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 1051# the kernel uses only C99 flexible arrays for dynamically sized trailing 1052# arrays. Enforce this for everything that may examine structure sizes and 1053# perform bounds checking. 1054KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 1055 1056#Currently, disable -Wstringop-overflow for GCC 11, globally. 1057KBUILD_CFLAGS-$(CONFIG_CC_NO_STRINGOP_OVERFLOW) += $(call cc-option, -Wno-stringop-overflow) 1058KBUILD_CFLAGS-$(CONFIG_CC_STRINGOP_OVERFLOW) += $(call cc-option, -Wstringop-overflow) 1059 1060# disable invalid "can't wrap" optimizations for signed / pointers 1061KBUILD_CFLAGS += -fno-strict-overflow 1062 1063# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1064KBUILD_CFLAGS += -fno-stack-check 1065 1066# conserve stack if available 1067ifdef CONFIG_CC_IS_GCC 1068KBUILD_CFLAGS += -fconserve-stack 1069endif 1070 1071# change __FILE__ to the relative path to the source directory 1072ifdef building_out_of_srctree 1073KBUILD_CPPFLAGS += $(call cc-option,-ffile-prefix-map=$(srcroot)/=) 1074KBUILD_RUSTFLAGS += --remap-path-prefix=$(srcroot)/= 1075endif 1076 1077# include additional Makefiles when needed 1078include-y := scripts/Makefile.extrawarn 1079include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1080include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1081include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1082include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1083include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1084include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1085include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1086include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1087include-$(CONFIG_AUTOFDO_CLANG) += scripts/Makefile.autofdo 1088include-$(CONFIG_PROPELLER_CLANG) += scripts/Makefile.propeller 1089include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1090 1091include $(addprefix $(srctree)/, $(include-y)) 1092 1093# scripts/Makefile.gcc-plugins is intentionally included last. 1094# Do not add $(call cc-option,...) below this line. When you build the kernel 1095# from the clean source tree, the GCC plugins do not exist at this point. 1096 1097# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1098KBUILD_CPPFLAGS += $(KCPPFLAGS) 1099KBUILD_AFLAGS += $(KAFLAGS) 1100KBUILD_CFLAGS += $(KCFLAGS) 1101KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1102 1103KBUILD_LDFLAGS_MODULE += --build-id=sha1 1104LDFLAGS_vmlinux += --build-id=sha1 1105 1106KBUILD_LDFLAGS += -z noexecstack 1107ifeq ($(CONFIG_LD_IS_BFD),y) 1108KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1109endif 1110 1111ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1112LDFLAGS_vmlinux += -X 1113endif 1114 1115ifeq ($(CONFIG_RELR),y) 1116# ld.lld before 15 did not support -z pack-relative-relocs. 1117LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1118endif 1119 1120# We never want expected sections to be placed heuristically by the 1121# linker. All sections should be explicitly named in the linker script. 1122ifdef CONFIG_LD_ORPHAN_WARN 1123LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1124endif 1125 1126ifneq ($(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS),) 1127LDFLAGS_vmlinux += --emit-relocs --discard-none 1128endif 1129 1130# Align the bit size of userspace programs with the kernel 1131KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1132KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1133 1134# userspace programs are linked via the compiler, use the correct linker 1135ifeq ($(CONFIG_CC_IS_CLANG)$(CONFIG_LD_IS_LLD),yy) 1136KBUILD_USERLDFLAGS += --ld-path=$(LD) 1137endif 1138 1139# make the checker run with the right architecture 1140CHECKFLAGS += --arch=$(ARCH) 1141 1142# insure the checker run with the right endianness 1143CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1144 1145# the checker needs the correct machine size 1146CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1147 1148# Default kernel image to build when no specific target is given. 1149# KBUILD_IMAGE may be overruled on the command line or 1150# set in the environment 1151# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1152# this default value 1153export KBUILD_IMAGE ?= vmlinux 1154 1155# 1156# INSTALL_PATH specifies where to place the updated kernel and system map 1157# images. Default is /boot, but you can set it to other values 1158export INSTALL_PATH ?= /boot 1159 1160# 1161# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1162# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1163# an argument if needed. Otherwise it defaults to the kernel install path 1164# 1165export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1166 1167# 1168# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1169# relocations required by build roots. This is not defined in the 1170# makefile but the argument can be passed to make if needed. 1171# 1172 1173MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1174export MODLIB 1175 1176PHONY += prepare0 1177 1178ifeq ($(KBUILD_EXTMOD),) 1179 1180build-dir := . 1181clean-dirs := $(sort . Documentation \ 1182 $(patsubst %/,%,$(filter %/, $(core-) \ 1183 $(drivers-) $(libs-)))) 1184 1185export ARCH_CORE := $(core-y) 1186export ARCH_LIB := $(filter %/, $(libs-y)) 1187export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1188# Externally visible symbols (used by link-vmlinux.sh) 1189 1190KBUILD_VMLINUX_OBJS := ./built-in.a 1191ifdef CONFIG_MODULES 1192KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1193KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1194else 1195KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1196endif 1197 1198export KBUILD_VMLINUX_LIBS 1199export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1200 1201ifdef CONFIG_TRIM_UNUSED_KSYMS 1202# For the kernel to actually contain only the needed exported symbols, 1203# we have to build modules as well to determine what those symbols are. 1204KBUILD_MODULES := 1 1205endif 1206 1207# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1208quiet_cmd_ar_vmlinux.a = AR $@ 1209 cmd_ar_vmlinux.a = \ 1210 rm -f $@; \ 1211 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1212 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1213 1214targets += vmlinux.a 1215vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1216 $(call if_changed,ar_vmlinux.a) 1217 1218PHONY += vmlinux_o 1219vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1220 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1221 1222vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1223 @: 1224 1225PHONY += vmlinux 1226# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1227# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1228# unrelated; the decompressors just happen to have the same base name, 1229# arch/*/boot/compressed/vmlinux. 1230# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1231# 1232# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1233# https://savannah.gnu.org/bugs/?61463 1234# For Make > 4.4, the following simple code will work: 1235# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1236vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1237vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1238vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1239 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1240 1241# The actual objects are generated when descending, 1242# make sure no implicit rule kicks in 1243$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1244 1245ifeq ($(origin KERNELRELEASE),file) 1246filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1247else 1248filechk_kernel.release = echo $(KERNELRELEASE) 1249endif 1250 1251# Store (new) KERNELRELEASE string in include/config/kernel.release 1252include/config/kernel.release: FORCE 1253 $(call filechk,kernel.release) 1254 1255# Additional helpers built in scripts/ 1256# Carefully list dependencies so we do not try to build scripts twice 1257# in parallel 1258PHONY += scripts 1259scripts: scripts_basic scripts_dtc 1260 $(Q)$(MAKE) $(build)=$(@) 1261 1262# Things we need to do before we recursively start building the kernel 1263# or the modules are listed in "prepare". 1264# A multi level approach is used. prepareN is processed before prepareN-1. 1265# archprepare is used in arch Makefiles and when processed asm symlink, 1266# version.h and scripts_basic is processed / created. 1267 1268PHONY += prepare archprepare 1269 1270archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1271 asm-generic $(version_h) include/generated/utsrelease.h \ 1272 include/generated/compile.h include/generated/autoconf.h \ 1273 include/generated/rustc_cfg remove-stale-files 1274 1275prepare0: archprepare 1276 $(Q)$(MAKE) $(build)=scripts/mod 1277 $(Q)$(MAKE) $(build)=. prepare 1278 1279# All the preparing.. 1280prepare: prepare0 1281ifdef CONFIG_RUST 1282 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1283 $(Q)$(MAKE) $(build)=rust 1284endif 1285 1286PHONY += remove-stale-files 1287remove-stale-files: 1288 $(Q)$(srctree)/scripts/remove-stale-files 1289 1290# Support for using generic headers in asm-generic 1291asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj 1292 1293PHONY += asm-generic uapi-asm-generic 1294asm-generic: uapi-asm-generic 1295 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1296 generic=include/asm-generic 1297uapi-asm-generic: 1298 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1299 generic=include/uapi/asm-generic 1300 1301# Generate some files 1302# --------------------------------------------------------------------------- 1303 1304# KERNELRELEASE can change from a few different places, meaning version.h 1305# needs to be updated, so this check is forced on all builds 1306 1307uts_len := 64 1308define filechk_utsrelease.h 1309 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1310 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1311 exit 1; \ 1312 fi; \ 1313 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1314endef 1315 1316define filechk_version.h 1317 if [ $(SUBLEVEL) -gt 255 ]; then \ 1318 echo \#define LINUX_VERSION_CODE $(shell \ 1319 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1320 else \ 1321 echo \#define LINUX_VERSION_CODE $(shell \ 1322 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1323 fi; \ 1324 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1325 ((c) > 255 ? 255 : (c)))'; \ 1326 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1327 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1328 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1329endef 1330 1331$(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1332$(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0) 1333$(version_h): FORCE 1334 $(call filechk,version.h) 1335 1336include/generated/utsrelease.h: include/config/kernel.release FORCE 1337 $(call filechk,utsrelease.h) 1338 1339filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1340 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1341 1342include/generated/compile.h: FORCE 1343 $(call filechk,compile.h) 1344 1345PHONY += headerdep 1346headerdep: 1347 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1348 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1349 1350# --------------------------------------------------------------------------- 1351# Kernel headers 1352 1353#Default location for installed headers 1354export INSTALL_HDR_PATH = $(objtree)/usr 1355 1356quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1357 cmd_headers_install = \ 1358 mkdir -p $(INSTALL_HDR_PATH); \ 1359 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1360 usr/include $(INSTALL_HDR_PATH) 1361 1362PHONY += headers_install 1363headers_install: headers 1364 $(call cmd,headers_install) 1365 1366PHONY += archheaders archscripts 1367 1368hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1369 1370PHONY += headers 1371headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1372ifdef HEADER_ARCH 1373 $(Q)$(MAKE) -f $(srctree)/Makefile HEADER_ARCH= SRCARCH=$(HEADER_ARCH) headers 1374else 1375 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1376 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1377endif 1378 1379ifdef CONFIG_HEADERS_INSTALL 1380prepare: headers 1381endif 1382 1383PHONY += scripts_unifdef 1384scripts_unifdef: scripts_basic 1385 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1386 1387PHONY += scripts_gen_packed_field_checks 1388scripts_gen_packed_field_checks: scripts_basic 1389 $(Q)$(MAKE) $(build)=scripts scripts/gen_packed_field_checks 1390 1391# --------------------------------------------------------------------------- 1392# Install 1393 1394# Many distributions have the custom install script, /sbin/installkernel. 1395# If DKMS is installed, 'make install' will eventually recurse back 1396# to this Makefile to build and install external modules. 1397# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1398 1399quiet_cmd_install = INSTALL $(INSTALL_PATH) 1400 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1401 1402# --------------------------------------------------------------------------- 1403# vDSO install 1404 1405PHONY += vdso_install 1406vdso_install: export INSTALL_FILES = $(vdso-install-y) 1407vdso_install: 1408 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1409 1410# --------------------------------------------------------------------------- 1411# Tools 1412 1413ifdef CONFIG_OBJTOOL 1414prepare: tools/objtool 1415endif 1416 1417ifdef CONFIG_BPF 1418ifdef CONFIG_DEBUG_INFO_BTF 1419prepare: tools/bpf/resolve_btfids 1420endif 1421endif 1422 1423# The tools build system is not a part of Kbuild and tends to introduce 1424# its own unique issues. If you need to integrate a new tool into Kbuild, 1425# please consider locating that tool outside the tools/ tree and using the 1426# standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry 1427# here. See Documentation/kbuild/makefiles.rst for details. 1428 1429PHONY += resolve_btfids_clean 1430 1431resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1432 1433# tools/bpf/resolve_btfids directory might not exist 1434# in output directory, skip its clean in that case 1435resolve_btfids_clean: 1436ifneq ($(wildcard $(resolve_btfids_O)),) 1437 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1438endif 1439 1440tools/: FORCE 1441 $(Q)mkdir -p $(objtree)/tools 1442 $(Q)$(MAKE) LDFLAGS= O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1443 1444tools/%: FORCE 1445 $(Q)mkdir -p $(objtree)/tools 1446 $(Q)$(MAKE) LDFLAGS= O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1447 1448# --------------------------------------------------------------------------- 1449# Kernel selftest 1450 1451PHONY += kselftest 1452kselftest: headers 1453 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1454 1455kselftest-%: headers FORCE 1456 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1457 1458PHONY += kselftest-merge 1459kselftest-merge: 1460 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1461 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1462 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1463 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1464 1465# --------------------------------------------------------------------------- 1466# Devicetree files 1467 1468ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1469dtstree := arch/$(SRCARCH)/boot/dts 1470endif 1471 1472ifneq ($(dtstree),) 1473 1474%.dtb: dtbs_prepare 1475 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1476 1477%.dtbo: dtbs_prepare 1478 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1479 1480PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1481dtbs: dtbs_prepare 1482 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1 1483 1484# include/config/kernel.release is actually needed when installing DTBs because 1485# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1486# dtbs_install depend on it as dtbs_install may run as root. 1487dtbs_prepare: include/config/kernel.release scripts_dtc 1488 1489ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1490export CHECK_DTBS=y 1491endif 1492 1493ifneq ($(CHECK_DTBS),) 1494dtbs_prepare: dt_binding_schemas 1495endif 1496 1497dtbs_check: dtbs 1498 1499dtbs_install: 1500 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) 1501 1502ifdef CONFIG_OF_EARLY_FLATTREE 1503all: dtbs 1504endif 1505 1506ifdef CONFIG_GENERIC_BUILTIN_DTB 1507vmlinux: dtbs 1508endif 1509 1510endif 1511 1512PHONY += scripts_dtc 1513scripts_dtc: scripts_basic 1514 $(Q)$(MAKE) $(build)=scripts/dtc 1515 1516ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1517export CHECK_DTBS=y 1518endif 1519 1520PHONY += dt_binding_check dt_binding_schemas 1521dt_binding_check: dt_binding_schemas scripts_dtc 1522 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1523 1524dt_binding_schemas: 1525 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1526 1527PHONY += dt_compatible_check 1528dt_compatible_check: dt_binding_schemas 1529 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1530 1531# --------------------------------------------------------------------------- 1532# Modules 1533 1534ifdef CONFIG_MODULES 1535 1536# By default, build modules as well 1537 1538all: modules 1539 1540# When we're building modules with modversions, we need to consider 1541# the built-in objects during the descend as well, in order to 1542# make sure the checksums are up to date before we record them. 1543ifdef CONFIG_MODVERSIONS 1544 KBUILD_BUILTIN := 1 1545endif 1546 1547# Build modules 1548# 1549 1550# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1551# is an exception. 1552ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1553KBUILD_BUILTIN := 1 1554modules: vmlinux 1555endif 1556 1557modules: modules_prepare 1558 1559# Target to prepare building external modules 1560modules_prepare: prepare 1561 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1562 1563endif # CONFIG_MODULES 1564 1565### 1566# Cleaning is done on three levels. 1567# make clean Delete most generated files 1568# Leave enough to build external modules 1569# make mrproper Delete the current configuration, and all generated files 1570# make distclean Remove editor backup files, patch leftover files and the like 1571 1572# Directories & files removed with 'make clean' 1573CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1574 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1575 modules.builtin.ranges vmlinux.o.map vmlinux.unstripped \ 1576 compile_commands.json rust/test \ 1577 rust-project.json .vmlinux.objs .vmlinux.export.c \ 1578 .builtin-dtbs-list .builtin-dtb.S 1579 1580# Directories & files removed with 'make mrproper' 1581MRPROPER_FILES += include/config include/generated \ 1582 arch/$(SRCARCH)/include/generated .objdiff \ 1583 debian snap tar-install PKGBUILD pacman \ 1584 .config .config.old .version \ 1585 Module.symvers \ 1586 certs/signing_key.pem \ 1587 certs/x509.genkey \ 1588 vmlinux-gdb.py \ 1589 rpmbuild \ 1590 rust/libmacros.so rust/libmacros.dylib 1591 1592# clean - Delete most, but leave enough to build external modules 1593# 1594clean: private rm-files := $(CLEAN_FILES) 1595 1596PHONY += archclean vmlinuxclean 1597 1598vmlinuxclean: 1599 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1600 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1601 1602clean: archclean vmlinuxclean resolve_btfids_clean 1603 1604# mrproper - Delete all generated files, including .config 1605# 1606mrproper: private rm-files := $(MRPROPER_FILES) 1607mrproper-dirs := $(addprefix _mrproper_,scripts) 1608 1609PHONY += $(mrproper-dirs) mrproper 1610$(mrproper-dirs): 1611 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1612 1613mrproper: clean $(mrproper-dirs) 1614 $(call cmd,rmfiles) 1615 @find . $(RCS_FIND_IGNORE) \ 1616 \( -name '*.rmeta' \) \ 1617 -type f -print | xargs rm -f 1618 1619# distclean 1620# 1621PHONY += distclean 1622 1623distclean: mrproper 1624 @find . $(RCS_FIND_IGNORE) \ 1625 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1626 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1627 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1628 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1629 -type f -print | xargs rm -f 1630 1631 1632# Packaging of the kernel to various formats 1633# --------------------------------------------------------------------------- 1634 1635%src-pkg: FORCE 1636 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1637%pkg: include/config/kernel.release FORCE 1638 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1639 1640# Brief documentation of the typical targets used 1641# --------------------------------------------------------------------------- 1642 1643boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1644boards := $(sort $(notdir $(boards))) 1645board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1646board-dirs := $(sort $(notdir $(board-dirs:/=))) 1647 1648PHONY += help 1649help: 1650 @echo 'Cleaning targets:' 1651 @echo ' clean - Remove most generated files but keep the config and' 1652 @echo ' enough build support to build external modules' 1653 @echo ' mrproper - Remove all generated files + config + various backup files' 1654 @echo ' distclean - mrproper + remove editor backup and patch files' 1655 @echo '' 1656 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1657 @echo '' 1658 @echo 'Other generic targets:' 1659 @echo ' all - Build all targets marked with [*]' 1660 @echo '* vmlinux - Build the bare kernel' 1661 @echo '* modules - Build all modules' 1662 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1663 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1664 @echo ' dir/ - Build all files in dir and below' 1665 @echo ' dir/file.[ois] - Build specified target only' 1666 @echo ' dir/file.ll - Build the LLVM assembly file' 1667 @echo ' (requires compiler support for LLVM assembly generation)' 1668 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1669 @echo ' (requires a recent binutils and recent build (System.map))' 1670 @echo ' dir/file.ko - Build module including final link' 1671 @echo ' modules_prepare - Set up for building external modules' 1672 @echo ' tags/TAGS - Generate tags file for editors' 1673 @echo ' cscope - Generate cscope index' 1674 @echo ' gtags - Generate GNU GLOBAL index' 1675 @echo ' kernelrelease - Output the release version string (use with make -s)' 1676 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1677 @echo ' image_name - Output the image name (use with make -s)' 1678 @echo ' headers - Build ready-to-install UAPI headers in usr/include' 1679 @echo ' headers_install - Install sanitised kernel UAPI headers to INSTALL_HDR_PATH'; \ 1680 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1681 echo '' 1682 @echo 'Static analysers:' 1683 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1684 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1685 @echo ' versioncheck - Sanity check on version.h usage' 1686 @echo ' includecheck - Check for duplicate included header files' 1687 @echo ' headerdep - Detect inclusion cycles in headers' 1688 @echo ' coccicheck - Check with Coccinelle' 1689 @echo ' clang-analyzer - Check with clang static analyzer' 1690 @echo ' clang-tidy - Check with clang-tidy' 1691 @echo '' 1692 @echo 'Tools:' 1693 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1694 @echo '' 1695 @echo 'Kernel selftest:' 1696 @echo ' kselftest - Build and run kernel selftest' 1697 @echo ' Build, install, and boot kernel before' 1698 @echo ' running kselftest on it' 1699 @echo ' Run as root for full coverage' 1700 @echo ' kselftest-all - Build kernel selftest' 1701 @echo ' kselftest-install - Build and install kernel selftest' 1702 @echo ' kselftest-clean - Remove all generated kselftest files' 1703 @echo ' kselftest-merge - Merge all the config dependencies of' 1704 @echo ' kselftest to existing .config.' 1705 @echo '' 1706 @echo 'Rust targets:' 1707 @echo ' rustavailable - Checks whether the Rust toolchain is' 1708 @echo ' available and, if not, explains why.' 1709 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1710 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1711 @echo ' is formatted, printing a diff otherwise.' 1712 @echo ' rustdoc - Generate Rust documentation' 1713 @echo ' (requires kernel .config)' 1714 @echo ' rusttest - Runs the Rust tests' 1715 @echo ' (requires kernel .config; downloads external repos)' 1716 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1717 @echo ' (requires kernel .config)' 1718 @echo ' dir/file.[os] - Build specified target only' 1719 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1720 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1721 @echo ' The output is not intended to be compilable.' 1722 @echo ' dir/file.ll - Build the LLVM assembly file' 1723 @echo '' 1724 @$(if $(dtstree), \ 1725 echo 'Devicetree:'; \ 1726 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1727 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1728 echo ' dt_binding_check - Validate device tree binding documents and examples'; \ 1729 echo ' dt_binding_schemas - Build processed device tree binding schemas'; \ 1730 echo ' dtbs_check - Validate device tree source files';\ 1731 echo '') 1732 1733 @echo 'Userspace tools targets:' 1734 @echo ' use "make tools/help"' 1735 @echo ' or "cd tools; make help"' 1736 @echo '' 1737 @echo 'Kernel packaging:' 1738 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1739 @echo '' 1740 @echo 'Documentation targets:' 1741 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1742 @echo '' 1743 @echo 'Architecture-specific targets ($(SRCARCH)):' 1744 @$(or $(archhelp),\ 1745 echo ' No architecture-specific help defined for $(SRCARCH)') 1746 @echo '' 1747 @$(if $(boards), \ 1748 $(foreach b, $(boards), \ 1749 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1750 echo '') 1751 @$(if $(board-dirs), \ 1752 $(foreach b, $(board-dirs), \ 1753 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1754 printf " %-16s - Show all of the above\\n" help-boards; \ 1755 echo '') 1756 1757 @echo ' make V=n [targets] 1: verbose build' 1758 @echo ' 2: give reason for rebuild of target' 1759 @echo ' V=1 and V=2 can be combined with V=12' 1760 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1761 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1762 @echo ' (sparse by default)' 1763 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1764 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1765 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where' 1766 @echo ' 1: warnings which may be relevant and do not occur too often' 1767 @echo ' 2: warnings which occur quite often but may still be relevant' 1768 @echo ' 3: more obscure warnings, can most likely be ignored' 1769 @echo ' c: extra checks in the configuration stage (Kconfig)' 1770 @echo ' e: warnings are being treated as errors' 1771 @echo ' Multiple levels can be combined with W=12 or W=123' 1772 @$(if $(dtstree), \ 1773 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1774 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1775 ) 1776 @echo '' 1777 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1778 @echo 'For further info see the ./README file' 1779 1780 1781help-board-dirs := $(addprefix help-,$(board-dirs)) 1782 1783help-boards: $(help-board-dirs) 1784 1785boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1786 1787$(help-board-dirs): help-%: 1788 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1789 @$(if $(boards-per-dir), \ 1790 $(foreach b, $(boards-per-dir), \ 1791 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1792 echo '') 1793 1794 1795# Documentation targets 1796# --------------------------------------------------------------------------- 1797DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1798 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs 1799PHONY += $(DOC_TARGETS) 1800$(DOC_TARGETS): 1801 $(Q)$(MAKE) $(build)=Documentation $@ 1802 1803 1804# Rust targets 1805# --------------------------------------------------------------------------- 1806 1807# "Is Rust available?" target 1808PHONY += rustavailable 1809rustavailable: 1810 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1811 1812# Documentation target 1813# 1814# Using the singular to avoid running afoul of `no-dot-config-targets`. 1815PHONY += rustdoc 1816rustdoc: prepare 1817 $(Q)$(MAKE) $(build)=rust $@ 1818 1819# Testing target 1820PHONY += rusttest 1821rusttest: prepare 1822 $(Q)$(MAKE) $(build)=rust $@ 1823 1824# Formatting targets 1825PHONY += rustfmt rustfmtcheck 1826 1827rustfmt: 1828 $(Q)find $(srctree) $(RCS_FIND_IGNORE) \ 1829 -type f -a -name '*.rs' -a ! -name '*generated*' -print \ 1830 | xargs $(RUSTFMT) $(rustfmt_flags) 1831 1832rustfmtcheck: rustfmt_flags = --check 1833rustfmtcheck: rustfmt 1834 1835# Misc 1836# --------------------------------------------------------------------------- 1837 1838PHONY += misc-check 1839misc-check: 1840 $(Q)$(srctree)/scripts/misc-check 1841 1842all: misc-check 1843 1844PHONY += scripts_gdb 1845scripts_gdb: prepare0 1846 $(Q)$(MAKE) $(build)=scripts/gdb 1847 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1848 1849ifdef CONFIG_GDB_SCRIPTS 1850all: scripts_gdb 1851endif 1852 1853else # KBUILD_EXTMOD 1854 1855filechk_kernel.release = echo $(KERNELRELEASE) 1856 1857### 1858# External module support. 1859# When building external modules the kernel used as basis is considered 1860# read-only, and no consistency checks are made and the make 1861# system is not used on the basis kernel. If updates are required 1862# in the basis kernel ordinary make commands (without M=...) must be used. 1863 1864# We are always building only modules. 1865KBUILD_BUILTIN := 1866KBUILD_MODULES := 1 1867 1868build-dir := . 1869 1870clean-dirs := . 1871clean: private rm-files := Module.symvers modules.nsdeps compile_commands.json 1872 1873PHONY += prepare 1874# now expand this into a simple variable to reduce the cost of shell evaluations 1875prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1876prepare: 1877 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1878 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1879 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1880 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1881 fi 1882 1883PHONY += help 1884help: 1885 @echo ' Building external modules.' 1886 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1887 @echo '' 1888 @echo ' modules - default target, build the module(s)' 1889 @echo ' modules_install - install the module' 1890 @echo ' clean - remove generated files in module directory only' 1891 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 1892 @echo '' 1893 1894ifndef CONFIG_MODULES 1895modules modules_install: __external_modules_error 1896__external_modules_error: 1897 @echo >&2 '***' 1898 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 1899 @echo >&2 '*** You cannot build or install external modules.' 1900 @echo >&2 '***' 1901 @false 1902endif 1903 1904endif # KBUILD_EXTMOD 1905 1906# --------------------------------------------------------------------------- 1907# Modules 1908 1909PHONY += modules modules_install modules_sign modules_prepare 1910 1911modules_install: 1912 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 1913 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 1914 1915ifeq ($(CONFIG_MODULE_SIG),y) 1916# modules_sign is a subset of modules_install. 1917# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1918modules_sign: modules_install 1919 @: 1920else 1921modules_sign: 1922 @echo >&2 '***' 1923 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 1924 @echo >&2 '***' 1925 @false 1926endif 1927 1928ifdef CONFIG_MODULES 1929 1930modules.order: $(build-dir) 1931 @: 1932 1933# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1934# This is solely useful to speed up test compiles. 1935modules: modpost 1936ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1937 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1938endif 1939 1940PHONY += modules_check 1941modules_check: modules.order 1942 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1943 1944else # CONFIG_MODULES 1945 1946modules: 1947 @: 1948 1949KBUILD_MODULES := 1950 1951endif # CONFIG_MODULES 1952 1953PHONY += modpost 1954modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 1955 $(if $(KBUILD_MODULES), modules_check) 1956 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1957 1958# Single targets 1959# --------------------------------------------------------------------------- 1960# To build individual files in subdirectories, you can do like this: 1961# 1962# make foo/bar/baz.s 1963# 1964# The supported suffixes for single-target are listed in 'single-targets' 1965# 1966# To build only under specific subdirectories, you can do like this: 1967# 1968# make foo/bar/baz/ 1969 1970ifdef single-build 1971 1972# .ko is special because modpost is needed 1973single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1974single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 1975 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 1976 1977$(single-ko): single_modules 1978 @: 1979$(single-no-ko): $(build-dir) 1980 @: 1981 1982# Remove modules.order when done because it is not the real one. 1983PHONY += single_modules 1984single_modules: $(single-no-ko) modules_prepare 1985 $(Q){ $(foreach m, $(single-ko), echo $(m:%.ko=%.o);) } > modules.order 1986 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1987ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1988 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1989endif 1990 $(Q)rm -f modules.order 1991 1992single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 1993 1994KBUILD_MODULES := 1 1995 1996endif 1997 1998prepare: outputmakefile 1999 2000# Preset locale variables to speed up the build process. Limit locale 2001# tweaks to this spot to avoid wrong language settings when running 2002# make menuconfig etc. 2003# Error messages still appears in the original language 2004PHONY += $(build-dir) 2005$(build-dir): prepare 2006 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 2007 2008clean-dirs := $(addprefix _clean_, $(clean-dirs)) 2009PHONY += $(clean-dirs) clean 2010$(clean-dirs): 2011 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 2012 2013clean: $(clean-dirs) 2014 $(call cmd,rmfiles) 2015 @find . $(RCS_FIND_IGNORE) \ 2016 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 2017 -o -name '*.ko.*' \ 2018 -o -name '*.dtb' -o -name '*.dtbo' \ 2019 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 2020 -o -name '*.dt.yaml' -o -name 'dtbs-list' \ 2021 -o -name '*.dwo' -o -name '*.lst' \ 2022 -o -name '*.su' -o -name '*.mod' \ 2023 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 2024 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 2025 -o -name '*.asn1.[ch]' \ 2026 -o -name '*.symtypes' -o -name 'modules.order' \ 2027 -o -name '*.c.[012]*.*' \ 2028 -o -name '*.ll' \ 2029 -o -name '*.gcno' \ 2030 \) -type f -print \ 2031 -o -name '.tmp_*' -print \ 2032 | xargs rm -rf 2033 2034# Generate tags for editors 2035# --------------------------------------------------------------------------- 2036quiet_cmd_tags = GEN $@ 2037 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 2038 2039tags TAGS cscope gtags: FORCE 2040 $(call cmd,tags) 2041 2042# Generate rust-project.json (a file that describes the structure of non-Cargo 2043# Rust projects) for rust-analyzer (an implementation of the Language Server 2044# Protocol). 2045PHONY += rust-analyzer 2046rust-analyzer: 2047 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 2048ifdef KBUILD_EXTMOD 2049# FIXME: external modules must not descend into a sub-directory of the kernel 2050 $(Q)$(MAKE) $(build)=$(objtree)/rust src=$(srctree)/rust $@ 2051else 2052 $(Q)$(MAKE) $(build)=rust $@ 2053endif 2054 2055# Script to generate missing namespace dependencies 2056# --------------------------------------------------------------------------- 2057 2058PHONY += nsdeps 2059nsdeps: export KBUILD_NSDEPS=1 2060nsdeps: modules 2061 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 2062 2063# Clang Tooling 2064# --------------------------------------------------------------------------- 2065 2066quiet_cmd_gen_compile_commands = GEN $@ 2067 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2068 2069compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \ 2070 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2071 $(if $(CONFIG_MODULES), modules.order) FORCE 2072 $(call if_changed,gen_compile_commands) 2073 2074targets += compile_commands.json 2075 2076PHONY += clang-tidy clang-analyzer 2077 2078ifdef CONFIG_CC_IS_CLANG 2079quiet_cmd_clang_tools = CHECK $< 2080 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2081 2082clang-tidy clang-analyzer: compile_commands.json 2083 $(call cmd,clang_tools) 2084else 2085clang-tidy clang-analyzer: 2086 @echo "$@ requires CC=clang" >&2 2087 @false 2088endif 2089 2090# Scripts to check various things for consistency 2091# --------------------------------------------------------------------------- 2092 2093PHONY += includecheck versioncheck coccicheck 2094 2095includecheck: 2096 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2097 -name '*.[hcS]' -type f -print | sort \ 2098 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2099 2100versioncheck: 2101 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2102 -name '*.[hcS]' -type f -print | sort \ 2103 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2104 2105coccicheck: 2106 $(Q)$(BASH) $(srctree)/scripts/$@ 2107 2108PHONY += checkstack kernelrelease kernelversion image_name 2109 2110# UML needs a little special treatment here. It wants to use the host 2111# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2112# else wants $(ARCH), including people doing cross-builds, which means 2113# that $(SUBARCH) doesn't work here. 2114ifeq ($(ARCH), um) 2115CHECKSTACK_ARCH := $(SUBARCH) 2116else 2117CHECKSTACK_ARCH := $(ARCH) 2118endif 2119MINSTACKSIZE ?= 100 2120checkstack: 2121 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2122 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2123 2124kernelrelease: 2125 @$(filechk_kernel.release) 2126 2127kernelversion: 2128 @echo $(KERNELVERSION) 2129 2130image_name: 2131 @echo $(KBUILD_IMAGE) 2132 2133PHONY += run-command 2134run-command: 2135 $(Q)$(KBUILD_RUN_COMMAND) 2136 2137quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2138 cmd_rmfiles = rm -rf $(rm-files) 2139 2140# read saved command lines for existing targets 2141existing-targets := $(wildcard $(sort $(targets))) 2142 2143-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2144 2145endif # config-build 2146endif # mixed-build 2147endif # need-sub-make 2148 2149PHONY += FORCE 2150FORCE: 2151 2152# Declare the contents of the PHONY variable as phony. We keep that 2153# information in a variable so we can use it in if_changed and friends. 2154.PHONY: $(PHONY) 2155