1# SPDX-License-Identifier: GPL-2.0 2VERSION = 6 3PATCHLEVEL = 15 4SUBLEVEL = 0 5EXTRAVERSION = 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 460 461# the KERNELDOC macro needs to be exported, as scripts/Makefile.build 462# has a logic to call it 463KERNELDOC = $(srctree)/scripts/kernel-doc.py 464export KERNELDOC 465 466KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 467 -O2 -fomit-frame-pointer -std=gnu11 468KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 469KBUILD_USERLDFLAGS := $(USERLDFLAGS) 470 471# These flags apply to all Rust code in the tree, including the kernel and 472# host programs. 473export rust_common_flags := --edition=2021 \ 474 -Zbinary_dep_depinfo=y \ 475 -Astable_features \ 476 -Dnon_ascii_idents \ 477 -Dunsafe_op_in_unsafe_fn \ 478 -Wmissing_docs \ 479 -Wrust_2018_idioms \ 480 -Wunreachable_pub \ 481 -Wclippy::all \ 482 -Wclippy::ignored_unit_patterns \ 483 -Wclippy::mut_mut \ 484 -Wclippy::needless_bitwise_bool \ 485 -Aclippy::needless_lifetimes \ 486 -Wclippy::no_mangle_with_rust_abi \ 487 -Wclippy::undocumented_unsafe_blocks \ 488 -Wclippy::unnecessary_safety_comment \ 489 -Wclippy::unnecessary_safety_doc \ 490 -Wrustdoc::missing_crate_level_docs \ 491 -Wrustdoc::unescaped_backticks 492 493KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \ 494 $(HOSTCFLAGS) -I $(srctree)/scripts/include 495KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \ 496 -I $(srctree)/scripts/include 497KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 498 -Zallow-features= $(HOSTRUSTFLAGS) 499KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 500KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 501KBUILD_PROCMACROLDFLAGS := $(or $(PROCMACROLDFLAGS),$(KBUILD_HOSTLDFLAGS)) 502 503# Make variables (CC, etc...) 504CPP = $(CC) -E 505ifneq ($(LLVM),) 506CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 507LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 508AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 509NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 510OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 511OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 512READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 513STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 514else 515CC = $(CROSS_COMPILE)gcc 516LD = $(CROSS_COMPILE)ld 517AR = $(CROSS_COMPILE)ar 518NM = $(CROSS_COMPILE)nm 519OBJCOPY = $(CROSS_COMPILE)objcopy 520OBJDUMP = $(CROSS_COMPILE)objdump 521READELF = $(CROSS_COMPILE)readelf 522STRIP = $(CROSS_COMPILE)strip 523endif 524RUSTC = rustc 525RUSTDOC = rustdoc 526RUSTFMT = rustfmt 527CLIPPY_DRIVER = clippy-driver 528BINDGEN = bindgen 529PAHOLE = pahole 530RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 531LEX = flex 532YACC = bison 533AWK = awk 534INSTALLKERNEL := installkernel 535PERL = perl 536PYTHON3 = python3 537CHECK = sparse 538BASH = bash 539KGZIP = gzip 540KBZIP2 = bzip2 541KLZOP = lzop 542LZMA = lzma 543LZ4 = lz4 544XZ = xz 545ZSTD = zstd 546 547CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 548 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 549NOSTDINC_FLAGS := 550CFLAGS_MODULE = 551RUSTFLAGS_MODULE = 552AFLAGS_MODULE = 553LDFLAGS_MODULE = 554CFLAGS_KERNEL = 555RUSTFLAGS_KERNEL = 556AFLAGS_KERNEL = 557LDFLAGS_vmlinux = 558 559# Use USERINCLUDE when you must reference the UAPI directories only. 560USERINCLUDE := \ 561 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 562 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 563 -I$(srctree)/include/uapi \ 564 -I$(objtree)/include/generated/uapi \ 565 -include $(srctree)/include/linux/compiler-version.h \ 566 -include $(srctree)/include/linux/kconfig.h 567 568# Use LINUXINCLUDE when you must reference the include/ directory. 569# Needed to be compatible with the O= option 570LINUXINCLUDE := \ 571 -I$(srctree)/arch/$(SRCARCH)/include \ 572 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 573 -I$(srctree)/include \ 574 -I$(objtree)/include \ 575 $(USERINCLUDE) 576 577KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 578 579KBUILD_CFLAGS := 580KBUILD_CFLAGS += -std=gnu11 581KBUILD_CFLAGS += -fshort-wchar 582KBUILD_CFLAGS += -funsigned-char 583KBUILD_CFLAGS += -fno-common 584KBUILD_CFLAGS += -fno-PIE 585KBUILD_CFLAGS += -fno-strict-aliasing 586 587KBUILD_CPPFLAGS := -D__KERNEL__ 588KBUILD_RUSTFLAGS := $(rust_common_flags) \ 589 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 590 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 591 -Csymbol-mangling-version=v0 \ 592 -Crelocation-model=static \ 593 -Zfunction-sections=n \ 594 -Wclippy::float_arithmetic 595 596KBUILD_AFLAGS_KERNEL := 597KBUILD_CFLAGS_KERNEL := 598KBUILD_RUSTFLAGS_KERNEL := 599KBUILD_AFLAGS_MODULE := -DMODULE 600KBUILD_CFLAGS_MODULE := -DMODULE 601KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 602KBUILD_LDFLAGS_MODULE := 603KBUILD_LDFLAGS := 604CLANG_FLAGS := 605 606ifeq ($(KBUILD_CLIPPY),1) 607 RUSTC_OR_CLIPPY_QUIET := CLIPPY 608 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 609else 610 RUSTC_OR_CLIPPY_QUIET := RUSTC 611 RUSTC_OR_CLIPPY = $(RUSTC) 612endif 613 614# Allows the usage of unstable features in stable compilers. 615export RUSTC_BOOTSTRAP := 1 616 617# Allows finding `.clippy.toml` in out-of-srctree builds. 618export CLIPPY_CONF_DIR := $(srctree) 619 620export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 621export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN 622export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 623export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 624export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 625export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 626export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS KBUILD_PROCMACROLDFLAGS LDFLAGS_MODULE 627export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 628 629export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 630export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 631export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 632export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 633export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 634export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 635 636# Files to ignore in find ... statements 637 638export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 639 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 640 -prune -o 641 642# =========================================================================== 643# Rules shared between *config targets and build targets 644 645# Basic helpers built in scripts/basic/ 646PHONY += scripts_basic 647scripts_basic: 648 $(Q)$(MAKE) $(build)=scripts/basic 649 650PHONY += outputmakefile 651ifdef building_out_of_srctree 652# Before starting out-of-tree build, make sure the source tree is clean. 653# outputmakefile generates a Makefile in the output directory, if using a 654# separate output directory. This allows convenient use of make in the 655# output directory. 656# At the same time when output Makefile generated, generate .gitignore to 657# ignore whole output directory 658 659ifdef KBUILD_EXTMOD 660print_env_for_makefile = \ 661 echo "export KBUILD_OUTPUT = $(objtree)"; \ 662 echo "export KBUILD_EXTMOD = $(realpath $(srcroot))" ; \ 663 echo "export KBUILD_EXTMOD_OUTPUT = $(CURDIR)" 664else 665print_env_for_makefile = \ 666 echo "export KBUILD_OUTPUT = $(CURDIR)" 667endif 668 669quiet_cmd_makefile = GEN Makefile 670 cmd_makefile = { \ 671 echo "\# Automatically generated by $(abs_srctree)/Makefile: don't edit"; \ 672 $(print_env_for_makefile); \ 673 echo "include $(abs_srctree)/Makefile"; \ 674 } > Makefile 675 676outputmakefile: 677ifeq ($(KBUILD_EXTMOD),) 678 @if [ -f $(srctree)/.config -o \ 679 -d $(srctree)/include/config -o \ 680 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 681 echo >&2 "***"; \ 682 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 683 echo >&2 "*** in $(abs_srctree)";\ 684 echo >&2 "***"; \ 685 false; \ 686 fi 687else 688 @if [ -f $(srcroot)/modules.order ]; then \ 689 echo >&2 "***"; \ 690 echo >&2 "*** The external module source tree is not clean."; \ 691 echo >&2 "*** Please run 'make -C $(abs_srctree) M=$(realpath $(srcroot)) clean'"; \ 692 echo >&2 "***"; \ 693 false; \ 694 fi 695endif 696 $(Q)ln -fsn $(srcroot) source 697 $(call cmd,makefile) 698 $(Q)test -e .gitignore || \ 699 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 700endif 701 702# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 703# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 704# CC_VERSION_TEXT and RUSTC_VERSION_TEXT are referenced from Kconfig (so they 705# need export), and from include/config/auto.conf.cmd to detect the compiler 706# upgrade. 707CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 708RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null)) 709 710ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 711include $(srctree)/scripts/Makefile.clang 712endif 713 714# Include this also for config targets because some architectures need 715# cc-cross-prefix to determine CROSS_COMPILE. 716ifdef need-compiler 717include $(srctree)/scripts/Makefile.compiler 718endif 719 720ifdef config-build 721# =========================================================================== 722# *config targets only - make sure prerequisites are updated, and descend 723# in scripts/kconfig to make the *config target 724 725# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 726# KBUILD_DEFCONFIG may point out an alternative default configuration 727# used for 'make defconfig' 728include $(srctree)/arch/$(SRCARCH)/Makefile 729export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT RUSTC_VERSION_TEXT 730 731config: outputmakefile scripts_basic FORCE 732 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 733 734%config: outputmakefile scripts_basic FORCE 735 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 736 737else #!config-build 738# =========================================================================== 739# Build targets only - this includes vmlinux, arch-specific targets, clean 740# targets and others. In general all targets except *config targets. 741 742# If building an external module we do not care about the all: rule 743# but instead __all depend on modules 744PHONY += all 745ifeq ($(KBUILD_EXTMOD),) 746__all: all 747else 748__all: modules 749endif 750 751targets := 752 753# Decide whether to build built-in, modular, or both. 754# Normally, just do built-in. 755 756KBUILD_MODULES := 757KBUILD_BUILTIN := 1 758 759# If we have only "make modules", don't compile built-in objects. 760ifeq ($(MAKECMDGOALS),modules) 761 KBUILD_BUILTIN := 762endif 763 764# If we have "make <whatever> modules", compile modules 765# in addition to whatever we do anyway. 766# Just "make" or "make all" shall build modules as well 767 768ifneq ($(filter all modules nsdeps compile_commands.json clang-%,$(MAKECMDGOALS)),) 769 KBUILD_MODULES := 1 770endif 771 772ifeq ($(MAKECMDGOALS),) 773 KBUILD_MODULES := 1 774endif 775 776export KBUILD_MODULES KBUILD_BUILTIN 777 778ifdef need-config 779include $(objtree)/include/config/auto.conf 780endif 781 782ifeq ($(KBUILD_EXTMOD),) 783# Objects we will link into vmlinux / subdirs we need to visit 784core-y := 785drivers-y := 786libs-y := lib/ 787endif # KBUILD_EXTMOD 788 789# The all: target is the default when no target is given on the 790# command line. 791# This allow a user to issue only 'make' to build a kernel including modules 792# Defaults to vmlinux, but the arch makefile usually adds further targets 793all: vmlinux 794 795CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 796ifdef CONFIG_CC_IS_GCC 797CFLAGS_GCOV += -fno-tree-loop-im 798endif 799export CFLAGS_GCOV 800 801# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 802ifdef CONFIG_FUNCTION_TRACER 803 CC_FLAGS_FTRACE := -pg 804endif 805 806include $(srctree)/arch/$(SRCARCH)/Makefile 807 808ifdef need-config 809ifdef may-sync-config 810# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 811# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 812# because some architectures define CROSS_COMPILE there. 813include include/config/auto.conf.cmd 814 815$(KCONFIG_CONFIG): 816 @echo >&2 '***' 817 @echo >&2 '*** Configuration file "$@" not found!' 818 @echo >&2 '***' 819 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 820 @echo >&2 '*** "make menuconfig" or "make xconfig").' 821 @echo >&2 '***' 822 @/bin/false 823 824# The actual configuration files used during the build are stored in 825# include/generated/ and include/config/. Update them if .config is newer than 826# include/config/auto.conf (which mirrors .config). 827# 828# This exploits the 'multi-target pattern rule' trick. 829# The syncconfig should be executed only once to make all the targets. 830# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 831# 832# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 833# so you cannot notice that Kconfig is waiting for the user input. 834%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 835 $(Q)$(kecho) " SYNC $@" 836 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 837else # !may-sync-config 838# External modules and some install targets need include/generated/autoconf.h 839# and include/config/auto.conf but do not care if they are up-to-date. 840# Use auto.conf to show the error message 841 842checked-configs := $(addprefix $(objtree)/, include/generated/autoconf.h include/generated/rustc_cfg include/config/auto.conf) 843missing-configs := $(filter-out $(wildcard $(checked-configs)), $(checked-configs)) 844 845ifdef missing-configs 846PHONY += $(objtree)/include/config/auto.conf 847 848$(objtree)/include/config/auto.conf: 849 @echo >&2 '***' 850 @echo >&2 '*** ERROR: Kernel configuration is invalid. The following files are missing:' 851 @printf >&2 '*** - %s\n' $(missing-configs) 852 @echo >&2 '*** Run "make oldconfig && make prepare" on kernel source to fix it.' 853 @echo >&2 '***' 854 @/bin/false 855endif 856 857endif # may-sync-config 858endif # need-config 859 860KBUILD_CFLAGS += -fno-delete-null-pointer-checks 861 862ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 863KBUILD_CFLAGS += -O2 864KBUILD_RUSTFLAGS += -Copt-level=2 865else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 866KBUILD_CFLAGS += -Os 867KBUILD_RUSTFLAGS += -Copt-level=s 868endif 869 870# Always set `debug-assertions` and `overflow-checks` because their default 871# depends on `opt-level` and `debug-assertions`, respectively. 872KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 873KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 874 875# Tell gcc to never replace conditional load with a non-conditional one 876ifdef CONFIG_CC_IS_GCC 877# gcc-10 renamed --param=allow-store-data-races=0 to 878# -fno-allow-store-data-races. 879KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 880KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 881endif 882 883ifdef CONFIG_READABLE_ASM 884# Disable optimizations that make assembler listings hard to read. 885# reorder blocks reorders the control in the function 886# ipa clone creates specialized cloned functions 887# partial inlining inlines only parts of functions 888KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 889endif 890 891stackp-flags-y := -fno-stack-protector 892stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 893stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 894 895KBUILD_CFLAGS += $(stackp-flags-y) 896 897KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings 898KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) 899 900ifdef CONFIG_FRAME_POINTER 901KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 902KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 903else 904# Some targets (ARM with Thumb2, for example), can't be built with frame 905# pointers. For those, we don't have FUNCTION_TRACER automatically 906# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 907# incompatible with -fomit-frame-pointer with current GCC, so we don't use 908# -fomit-frame-pointer with FUNCTION_TRACER. 909# In the Rust target specification, "frame-pointer" is set explicitly 910# to "may-omit". 911ifndef CONFIG_FUNCTION_TRACER 912KBUILD_CFLAGS += -fomit-frame-pointer 913endif 914endif 915 916# Initialize all stack variables with a 0xAA pattern. 917ifdef CONFIG_INIT_STACK_ALL_PATTERN 918KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 919endif 920 921# Initialize all stack variables with a zero value. 922ifdef CONFIG_INIT_STACK_ALL_ZERO 923KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 924ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 925# https://github.com/llvm/llvm-project/issues/44842 926CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 927export CC_AUTO_VAR_INIT_ZERO_ENABLER 928KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 929endif 930endif 931 932# Explicitly clear padding bits during variable initialization 933KBUILD_CFLAGS += $(call cc-option,-fzero-init-padding-bits=all) 934 935# While VLAs have been removed, GCC produces unreachable stack probes 936# for the randomize_kstack_offset feature. Disable it for all compilers. 937KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 938 939# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 940ifdef CONFIG_ZERO_CALL_USED_REGS 941KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 942endif 943 944ifdef CONFIG_FUNCTION_TRACER 945ifdef CONFIG_FTRACE_MCOUNT_USE_CC 946 CC_FLAGS_FTRACE += -mrecord-mcount 947 ifdef CONFIG_HAVE_NOP_MCOUNT 948 ifeq ($(call cc-option-yn, -mnop-mcount),y) 949 CC_FLAGS_FTRACE += -mnop-mcount 950 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 951 endif 952 endif 953endif 954ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 955 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 956 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 957 endif 958endif 959ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 960 ifdef CONFIG_HAVE_C_RECORDMCOUNT 961 BUILD_C_RECORDMCOUNT := y 962 export BUILD_C_RECORDMCOUNT 963 endif 964endif 965ifdef CONFIG_HAVE_FENTRY 966 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 967 ifeq ($(call cc-option-yn, -mfentry),y) 968 CC_FLAGS_FTRACE += -mfentry 969 CC_FLAGS_USING += -DCC_USING_FENTRY 970 endif 971endif 972export CC_FLAGS_FTRACE 973KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 974KBUILD_AFLAGS += $(CC_FLAGS_USING) 975endif 976 977# We trigger additional mismatches with less inlining 978ifdef CONFIG_DEBUG_SECTION_MISMATCH 979KBUILD_CFLAGS += -fno-inline-functions-called-once 980endif 981 982# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 983ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 984KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 985KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 986LDFLAGS_vmlinux += --gc-sections 987endif 988 989ifdef CONFIG_SHADOW_CALL_STACK 990ifndef CONFIG_DYNAMIC_SCS 991CC_FLAGS_SCS := -fsanitize=shadow-call-stack 992KBUILD_CFLAGS += $(CC_FLAGS_SCS) 993KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack 994endif 995export CC_FLAGS_SCS 996endif 997 998ifdef CONFIG_LTO_CLANG 999ifdef CONFIG_LTO_CLANG_THIN 1000CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 1001else 1002CC_FLAGS_LTO := -flto 1003endif 1004CC_FLAGS_LTO += -fvisibility=hidden 1005 1006# Limit inlining across translation units to reduce binary size 1007KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 1008endif 1009 1010ifdef CONFIG_LTO 1011KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 1012KBUILD_AFLAGS += -fno-lto 1013export CC_FLAGS_LTO 1014endif 1015 1016ifdef CONFIG_CFI_CLANG 1017CC_FLAGS_CFI := -fsanitize=kcfi 1018ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS 1019 CC_FLAGS_CFI += -fsanitize-cfi-icall-experimental-normalize-integers 1020endif 1021ifdef CONFIG_FINEIBT_BHI 1022 CC_FLAGS_CFI += -fsanitize-kcfi-arity 1023endif 1024ifdef CONFIG_RUST 1025 # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects 1026 # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS. 1027 RUSTC_FLAGS_CFI := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers 1028 KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI) 1029 export RUSTC_FLAGS_CFI 1030endif 1031KBUILD_CFLAGS += $(CC_FLAGS_CFI) 1032export CC_FLAGS_CFI 1033endif 1034 1035# Architectures can define flags to add/remove for floating-point support 1036CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT 1037export CC_FLAGS_FPU 1038export CC_FLAGS_NO_FPU 1039 1040ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 1041# Set the minimal function alignment. Use the newer GCC option 1042# -fmin-function-alignment if it is available, or fall back to -falign-funtions. 1043# See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. 1044ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT 1045KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) 1046else 1047KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 1048endif 1049endif 1050 1051# arch Makefile may override CC so keep this after arch Makefile is included 1052NOSTDINC_FLAGS += -nostdinc 1053 1054# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 1055# the kernel uses only C99 flexible arrays for dynamically sized trailing 1056# arrays. Enforce this for everything that may examine structure sizes and 1057# perform bounds checking. 1058KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 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# Ensure compilers do not transform certain loops into calls to wcslen() 1072KBUILD_CFLAGS += -fno-builtin-wcslen 1073 1074# change __FILE__ to the relative path to the source directory 1075ifdef building_out_of_srctree 1076KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srcroot)/=) 1077endif 1078 1079# include additional Makefiles when needed 1080include-y := scripts/Makefile.extrawarn 1081include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1082include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1083include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1084include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1085include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1086include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1087include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1088include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1089include-$(CONFIG_AUTOFDO_CLANG) += scripts/Makefile.autofdo 1090include-$(CONFIG_PROPELLER_CLANG) += scripts/Makefile.propeller 1091include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1092 1093include $(addprefix $(srctree)/, $(include-y)) 1094 1095# scripts/Makefile.gcc-plugins is intentionally included last. 1096# Do not add $(call cc-option,...) below this line. When you build the kernel 1097# from the clean source tree, the GCC plugins do not exist at this point. 1098 1099# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1100KBUILD_CPPFLAGS += $(KCPPFLAGS) 1101KBUILD_AFLAGS += $(KAFLAGS) 1102KBUILD_CFLAGS += $(KCFLAGS) 1103KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1104 1105KBUILD_LDFLAGS_MODULE += --build-id=sha1 1106LDFLAGS_vmlinux += --build-id=sha1 1107 1108KBUILD_LDFLAGS += -z noexecstack 1109ifeq ($(CONFIG_LD_IS_BFD),y) 1110KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1111endif 1112 1113ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1114LDFLAGS_vmlinux += -X 1115endif 1116 1117ifeq ($(CONFIG_RELR),y) 1118# ld.lld before 15 did not support -z pack-relative-relocs. 1119LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1120endif 1121 1122# We never want expected sections to be placed heuristically by the 1123# linker. All sections should be explicitly named in the linker script. 1124ifdef CONFIG_LD_ORPHAN_WARN 1125LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1126endif 1127 1128ifneq ($(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS),) 1129LDFLAGS_vmlinux += --emit-relocs --discard-none 1130endif 1131 1132# Align the bit size of userspace programs with the kernel 1133KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1134KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1135 1136# userspace programs are linked via the compiler, use the correct linker 1137ifeq ($(CONFIG_CC_IS_CLANG)$(CONFIG_LD_IS_LLD),yy) 1138KBUILD_USERLDFLAGS += --ld-path=$(LD) 1139endif 1140 1141# make the checker run with the right architecture 1142CHECKFLAGS += --arch=$(ARCH) 1143 1144# insure the checker run with the right endianness 1145CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1146 1147# the checker needs the correct machine size 1148CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1149 1150# Default kernel image to build when no specific target is given. 1151# KBUILD_IMAGE may be overruled on the command line or 1152# set in the environment 1153# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1154# this default value 1155export KBUILD_IMAGE ?= vmlinux 1156 1157# 1158# INSTALL_PATH specifies where to place the updated kernel and system map 1159# images. Default is /boot, but you can set it to other values 1160export INSTALL_PATH ?= /boot 1161 1162# 1163# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1164# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1165# an argument if needed. Otherwise it defaults to the kernel install path 1166# 1167export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1168 1169# 1170# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1171# relocations required by build roots. This is not defined in the 1172# makefile but the argument can be passed to make if needed. 1173# 1174 1175MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1176export MODLIB 1177 1178PHONY += prepare0 1179 1180ifeq ($(KBUILD_EXTMOD),) 1181 1182build-dir := . 1183clean-dirs := $(sort . Documentation \ 1184 $(patsubst %/,%,$(filter %/, $(core-) \ 1185 $(drivers-) $(libs-)))) 1186 1187export ARCH_CORE := $(core-y) 1188export ARCH_LIB := $(filter %/, $(libs-y)) 1189export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1190# Externally visible symbols (used by link-vmlinux.sh) 1191 1192KBUILD_VMLINUX_OBJS := ./built-in.a 1193ifdef CONFIG_MODULES 1194KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1195KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1196else 1197KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1198endif 1199 1200export KBUILD_VMLINUX_LIBS 1201export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1202 1203ifdef CONFIG_TRIM_UNUSED_KSYMS 1204# For the kernel to actually contain only the needed exported symbols, 1205# we have to build modules as well to determine what those symbols are. 1206KBUILD_MODULES := 1 1207endif 1208 1209# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1210quiet_cmd_ar_vmlinux.a = AR $@ 1211 cmd_ar_vmlinux.a = \ 1212 rm -f $@; \ 1213 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1214 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1215 1216targets += vmlinux.a 1217vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1218 $(call if_changed,ar_vmlinux.a) 1219 1220PHONY += vmlinux_o 1221vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1222 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1223 1224vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1225 @: 1226 1227PHONY += vmlinux 1228# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1229# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1230# unrelated; the decompressors just happen to have the same base name, 1231# arch/*/boot/compressed/vmlinux. 1232# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1233# 1234# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1235# https://savannah.gnu.org/bugs/?61463 1236# For Make > 4.4, the following simple code will work: 1237# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1238vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1239vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1240vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1241 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1242 1243# The actual objects are generated when descending, 1244# make sure no implicit rule kicks in 1245$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1246 1247ifeq ($(origin KERNELRELEASE),file) 1248filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1249else 1250filechk_kernel.release = echo $(KERNELRELEASE) 1251endif 1252 1253# Store (new) KERNELRELEASE string in include/config/kernel.release 1254include/config/kernel.release: FORCE 1255 $(call filechk,kernel.release) 1256 1257# Additional helpers built in scripts/ 1258# Carefully list dependencies so we do not try to build scripts twice 1259# in parallel 1260PHONY += scripts 1261scripts: scripts_basic scripts_dtc 1262 $(Q)$(MAKE) $(build)=$(@) 1263 1264# Things we need to do before we recursively start building the kernel 1265# or the modules are listed in "prepare". 1266# A multi level approach is used. prepareN is processed before prepareN-1. 1267# archprepare is used in arch Makefiles and when processed asm symlink, 1268# version.h and scripts_basic is processed / created. 1269 1270PHONY += prepare archprepare 1271 1272archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1273 asm-generic $(version_h) include/generated/utsrelease.h \ 1274 include/generated/compile.h include/generated/autoconf.h \ 1275 include/generated/rustc_cfg remove-stale-files 1276 1277prepare0: archprepare 1278 $(Q)$(MAKE) $(build)=scripts/mod 1279 $(Q)$(MAKE) $(build)=. prepare 1280 1281# All the preparing.. 1282prepare: prepare0 1283ifdef CONFIG_RUST 1284 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1285 $(Q)$(MAKE) $(build)=rust 1286endif 1287 1288PHONY += remove-stale-files 1289remove-stale-files: 1290 $(Q)$(srctree)/scripts/remove-stale-files 1291 1292# Support for using generic headers in asm-generic 1293asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj 1294 1295PHONY += asm-generic uapi-asm-generic 1296asm-generic: uapi-asm-generic 1297 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1298 generic=include/asm-generic 1299uapi-asm-generic: 1300 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1301 generic=include/uapi/asm-generic 1302 1303# Generate some files 1304# --------------------------------------------------------------------------- 1305 1306# KERNELRELEASE can change from a few different places, meaning version.h 1307# needs to be updated, so this check is forced on all builds 1308 1309uts_len := 64 1310define filechk_utsrelease.h 1311 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1312 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1313 exit 1; \ 1314 fi; \ 1315 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1316endef 1317 1318define filechk_version.h 1319 if [ $(SUBLEVEL) -gt 255 ]; then \ 1320 echo \#define LINUX_VERSION_CODE $(shell \ 1321 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1322 else \ 1323 echo \#define LINUX_VERSION_CODE $(shell \ 1324 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1325 fi; \ 1326 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1327 ((c) > 255 ? 255 : (c)))'; \ 1328 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1329 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1330 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1331endef 1332 1333$(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1334$(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0) 1335$(version_h): FORCE 1336 $(call filechk,version.h) 1337 1338include/generated/utsrelease.h: include/config/kernel.release FORCE 1339 $(call filechk,utsrelease.h) 1340 1341filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1342 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1343 1344include/generated/compile.h: FORCE 1345 $(call filechk,compile.h) 1346 1347PHONY += headerdep 1348headerdep: 1349 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1350 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1351 1352# --------------------------------------------------------------------------- 1353# Kernel headers 1354 1355#Default location for installed headers 1356export INSTALL_HDR_PATH = $(objtree)/usr 1357 1358quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1359 cmd_headers_install = \ 1360 mkdir -p $(INSTALL_HDR_PATH); \ 1361 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1362 usr/include $(INSTALL_HDR_PATH) 1363 1364PHONY += headers_install 1365headers_install: headers 1366 $(call cmd,headers_install) 1367 1368PHONY += archheaders archscripts 1369 1370hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1371 1372PHONY += headers 1373headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1374ifdef HEADER_ARCH 1375 $(Q)$(MAKE) -f $(srctree)/Makefile HEADER_ARCH= SRCARCH=$(HEADER_ARCH) headers 1376else 1377 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1378 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1379endif 1380 1381ifdef CONFIG_HEADERS_INSTALL 1382prepare: headers 1383endif 1384 1385PHONY += scripts_unifdef 1386scripts_unifdef: scripts_basic 1387 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1388 1389PHONY += scripts_gen_packed_field_checks 1390scripts_gen_packed_field_checks: scripts_basic 1391 $(Q)$(MAKE) $(build)=scripts scripts/gen_packed_field_checks 1392 1393# --------------------------------------------------------------------------- 1394# Install 1395 1396# Many distributions have the custom install script, /sbin/installkernel. 1397# If DKMS is installed, 'make install' will eventually recurse back 1398# to this Makefile to build and install external modules. 1399# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1400 1401quiet_cmd_install = INSTALL $(INSTALL_PATH) 1402 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1403 1404# --------------------------------------------------------------------------- 1405# vDSO install 1406 1407PHONY += vdso_install 1408vdso_install: export INSTALL_FILES = $(vdso-install-y) 1409vdso_install: 1410 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1411 1412# --------------------------------------------------------------------------- 1413# Tools 1414 1415ifdef CONFIG_OBJTOOL 1416prepare: tools/objtool 1417endif 1418 1419ifdef CONFIG_BPF 1420ifdef CONFIG_DEBUG_INFO_BTF 1421prepare: tools/bpf/resolve_btfids 1422endif 1423endif 1424 1425# The tools build system is not a part of Kbuild and tends to introduce 1426# its own unique issues. If you need to integrate a new tool into Kbuild, 1427# please consider locating that tool outside the tools/ tree and using the 1428# standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry 1429# here. See Documentation/kbuild/makefiles.rst for details. 1430 1431PHONY += resolve_btfids_clean 1432 1433resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1434 1435# tools/bpf/resolve_btfids directory might not exist 1436# in output directory, skip its clean in that case 1437resolve_btfids_clean: 1438ifneq ($(wildcard $(resolve_btfids_O)),) 1439 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1440endif 1441 1442tools/: FORCE 1443 $(Q)mkdir -p $(objtree)/tools 1444 $(Q)$(MAKE) LDFLAGS= O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1445 1446tools/%: FORCE 1447 $(Q)mkdir -p $(objtree)/tools 1448 $(Q)$(MAKE) LDFLAGS= O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1449 1450# --------------------------------------------------------------------------- 1451# Kernel selftest 1452 1453PHONY += kselftest 1454kselftest: headers 1455 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1456 1457kselftest-%: headers FORCE 1458 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1459 1460PHONY += kselftest-merge 1461kselftest-merge: 1462 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1463 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1464 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1465 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1466 1467# --------------------------------------------------------------------------- 1468# Devicetree files 1469 1470ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1471dtstree := arch/$(SRCARCH)/boot/dts 1472endif 1473 1474ifneq ($(dtstree),) 1475 1476%.dtb: dtbs_prepare 1477 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1478 1479%.dtbo: dtbs_prepare 1480 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1481 1482PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1483dtbs: dtbs_prepare 1484 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1 1485 1486# include/config/kernel.release is actually needed when installing DTBs because 1487# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1488# dtbs_install depend on it as dtbs_install may run as root. 1489dtbs_prepare: include/config/kernel.release scripts_dtc 1490 1491ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1492export CHECK_DTBS=y 1493endif 1494 1495ifneq ($(CHECK_DTBS),) 1496dtbs_prepare: dt_binding_schemas 1497endif 1498 1499dtbs_check: dtbs 1500 1501dtbs_install: 1502 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) 1503 1504ifdef CONFIG_OF_EARLY_FLATTREE 1505all: dtbs 1506endif 1507 1508ifdef CONFIG_GENERIC_BUILTIN_DTB 1509vmlinux: dtbs 1510endif 1511 1512endif 1513 1514PHONY += scripts_dtc 1515scripts_dtc: scripts_basic 1516 $(Q)$(MAKE) $(build)=scripts/dtc 1517 1518ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1519export CHECK_DTBS=y 1520endif 1521 1522PHONY += dt_binding_check dt_binding_schemas 1523dt_binding_check: dt_binding_schemas scripts_dtc 1524 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1525 1526dt_binding_schemas: 1527 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1528 1529PHONY += dt_compatible_check 1530dt_compatible_check: dt_binding_schemas 1531 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1532 1533# --------------------------------------------------------------------------- 1534# Modules 1535 1536ifdef CONFIG_MODULES 1537 1538# By default, build modules as well 1539 1540all: modules 1541 1542# When we're building modules with modversions, we need to consider 1543# the built-in objects during the descend as well, in order to 1544# make sure the checksums are up to date before we record them. 1545ifdef CONFIG_MODVERSIONS 1546 KBUILD_BUILTIN := 1 1547endif 1548 1549# Build modules 1550# 1551 1552# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1553# is an exception. 1554ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1555KBUILD_BUILTIN := 1 1556modules: vmlinux 1557endif 1558 1559modules: modules_prepare 1560 1561# Target to prepare building external modules 1562modules_prepare: prepare 1563 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1564 1565endif # CONFIG_MODULES 1566 1567### 1568# Cleaning is done on three levels. 1569# make clean Delete most generated files 1570# Leave enough to build external modules 1571# make mrproper Delete the current configuration, and all generated files 1572# make distclean Remove editor backup files, patch leftover files and the like 1573 1574# Directories & files removed with 'make clean' 1575CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1576 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1577 modules.builtin.ranges vmlinux.o.map vmlinux.unstripped \ 1578 compile_commands.json rust/test \ 1579 rust-project.json .vmlinux.objs .vmlinux.export.c \ 1580 .builtin-dtbs-list .builtin-dtb.S 1581 1582# Directories & files removed with 'make mrproper' 1583MRPROPER_FILES += include/config include/generated \ 1584 arch/$(SRCARCH)/include/generated .objdiff \ 1585 debian snap tar-install PKGBUILD pacman \ 1586 .config .config.old .version \ 1587 Module.symvers \ 1588 certs/signing_key.pem \ 1589 certs/x509.genkey \ 1590 vmlinux-gdb.py \ 1591 rpmbuild \ 1592 rust/libmacros.so rust/libmacros.dylib 1593 1594# clean - Delete most, but leave enough to build external modules 1595# 1596clean: private rm-files := $(CLEAN_FILES) 1597 1598PHONY += archclean vmlinuxclean 1599 1600vmlinuxclean: 1601 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1602 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1603 1604clean: archclean vmlinuxclean resolve_btfids_clean 1605 1606# mrproper - Delete all generated files, including .config 1607# 1608mrproper: private rm-files := $(MRPROPER_FILES) 1609mrproper-dirs := $(addprefix _mrproper_,scripts) 1610 1611PHONY += $(mrproper-dirs) mrproper 1612$(mrproper-dirs): 1613 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1614 1615mrproper: clean $(mrproper-dirs) 1616 $(call cmd,rmfiles) 1617 @find . $(RCS_FIND_IGNORE) \ 1618 \( -name '*.rmeta' \) \ 1619 -type f -print | xargs rm -f 1620 1621# distclean 1622# 1623PHONY += distclean 1624 1625distclean: mrproper 1626 @find . $(RCS_FIND_IGNORE) \ 1627 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1628 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1629 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1630 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1631 -type f -print | xargs rm -f 1632 1633 1634# Packaging of the kernel to various formats 1635# --------------------------------------------------------------------------- 1636 1637%src-pkg: FORCE 1638 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1639%pkg: include/config/kernel.release FORCE 1640 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1641 1642# Brief documentation of the typical targets used 1643# --------------------------------------------------------------------------- 1644 1645boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1646boards := $(sort $(notdir $(boards))) 1647board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1648board-dirs := $(sort $(notdir $(board-dirs:/=))) 1649 1650PHONY += help 1651help: 1652 @echo 'Cleaning targets:' 1653 @echo ' clean - Remove most generated files but keep the config and' 1654 @echo ' enough build support to build external modules' 1655 @echo ' mrproper - Remove all generated files + config + various backup files' 1656 @echo ' distclean - mrproper + remove editor backup and patch files' 1657 @echo '' 1658 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1659 @echo '' 1660 @echo 'Other generic targets:' 1661 @echo ' all - Build all targets marked with [*]' 1662 @echo '* vmlinux - Build the bare kernel' 1663 @echo '* modules - Build all modules' 1664 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1665 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1666 @echo ' dir/ - Build all files in dir and below' 1667 @echo ' dir/file.[ois] - Build specified target only' 1668 @echo ' dir/file.ll - Build the LLVM assembly file' 1669 @echo ' (requires compiler support for LLVM assembly generation)' 1670 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1671 @echo ' (requires a recent binutils and recent build (System.map))' 1672 @echo ' dir/file.ko - Build module including final link' 1673 @echo ' modules_prepare - Set up for building external modules' 1674 @echo ' tags/TAGS - Generate tags file for editors' 1675 @echo ' cscope - Generate cscope index' 1676 @echo ' gtags - Generate GNU GLOBAL index' 1677 @echo ' kernelrelease - Output the release version string (use with make -s)' 1678 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1679 @echo ' image_name - Output the image name (use with make -s)' 1680 @echo ' headers - Build ready-to-install UAPI headers in usr/include' 1681 @echo ' headers_install - Install sanitised kernel UAPI headers to INSTALL_HDR_PATH'; \ 1682 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1683 echo '' 1684 @echo 'Static analysers:' 1685 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1686 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1687 @echo ' versioncheck - Sanity check on version.h usage' 1688 @echo ' includecheck - Check for duplicate included header files' 1689 @echo ' headerdep - Detect inclusion cycles in headers' 1690 @echo ' coccicheck - Check with Coccinelle' 1691 @echo ' clang-analyzer - Check with clang static analyzer' 1692 @echo ' clang-tidy - Check with clang-tidy' 1693 @echo '' 1694 @echo 'Tools:' 1695 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1696 @echo '' 1697 @echo 'Kernel selftest:' 1698 @echo ' kselftest - Build and run kernel selftest' 1699 @echo ' Build, install, and boot kernel before' 1700 @echo ' running kselftest on it' 1701 @echo ' Run as root for full coverage' 1702 @echo ' kselftest-all - Build kernel selftest' 1703 @echo ' kselftest-install - Build and install kernel selftest' 1704 @echo ' kselftest-clean - Remove all generated kselftest files' 1705 @echo ' kselftest-merge - Merge all the config dependencies of' 1706 @echo ' kselftest to existing .config.' 1707 @echo '' 1708 @echo 'Rust targets:' 1709 @echo ' rustavailable - Checks whether the Rust toolchain is' 1710 @echo ' available and, if not, explains why.' 1711 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1712 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1713 @echo ' is formatted, printing a diff otherwise.' 1714 @echo ' rustdoc - Generate Rust documentation' 1715 @echo ' (requires kernel .config)' 1716 @echo ' rusttest - Runs the Rust tests' 1717 @echo ' (requires kernel .config; downloads external repos)' 1718 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1719 @echo ' (requires kernel .config)' 1720 @echo ' dir/file.[os] - Build specified target only' 1721 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1722 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1723 @echo ' The output is not intended to be compilable.' 1724 @echo ' dir/file.ll - Build the LLVM assembly file' 1725 @echo '' 1726 @$(if $(dtstree), \ 1727 echo 'Devicetree:'; \ 1728 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1729 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1730 echo ' dt_binding_check - Validate device tree binding documents and examples'; \ 1731 echo ' dt_binding_schemas - Build processed device tree binding schemas'; \ 1732 echo ' dtbs_check - Validate device tree source files';\ 1733 echo '') 1734 1735 @echo 'Userspace tools targets:' 1736 @echo ' use "make tools/help"' 1737 @echo ' or "cd tools; make help"' 1738 @echo '' 1739 @echo 'Kernel packaging:' 1740 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1741 @echo '' 1742 @echo 'Documentation targets:' 1743 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1744 @echo '' 1745 @echo 'Architecture-specific targets ($(SRCARCH)):' 1746 @$(or $(archhelp),\ 1747 echo ' No architecture-specific help defined for $(SRCARCH)') 1748 @echo '' 1749 @$(if $(boards), \ 1750 $(foreach b, $(boards), \ 1751 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1752 echo '') 1753 @$(if $(board-dirs), \ 1754 $(foreach b, $(board-dirs), \ 1755 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1756 printf " %-16s - Show all of the above\\n" help-boards; \ 1757 echo '') 1758 1759 @echo ' make V=n [targets] 1: verbose build' 1760 @echo ' 2: give reason for rebuild of target' 1761 @echo ' V=1 and V=2 can be combined with V=12' 1762 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1763 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1764 @echo ' (sparse by default)' 1765 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1766 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1767 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where' 1768 @echo ' 1: warnings which may be relevant and do not occur too often' 1769 @echo ' 2: warnings which occur quite often but may still be relevant' 1770 @echo ' 3: more obscure warnings, can most likely be ignored' 1771 @echo ' c: extra checks in the configuration stage (Kconfig)' 1772 @echo ' e: warnings are being treated as errors' 1773 @echo ' Multiple levels can be combined with W=12 or W=123' 1774 @$(if $(dtstree), \ 1775 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1776 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1777 ) 1778 @echo '' 1779 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1780 @echo 'For further info see the ./README file' 1781 1782 1783help-board-dirs := $(addprefix help-,$(board-dirs)) 1784 1785help-boards: $(help-board-dirs) 1786 1787boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1788 1789$(help-board-dirs): help-%: 1790 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1791 @$(if $(boards-per-dir), \ 1792 $(foreach b, $(boards-per-dir), \ 1793 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1794 echo '') 1795 1796 1797# Documentation targets 1798# --------------------------------------------------------------------------- 1799DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1800 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs 1801PHONY += $(DOC_TARGETS) 1802$(DOC_TARGETS): 1803 $(Q)$(MAKE) $(build)=Documentation $@ 1804 1805 1806# Rust targets 1807# --------------------------------------------------------------------------- 1808 1809# "Is Rust available?" target 1810PHONY += rustavailable 1811rustavailable: 1812 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1813 1814# Documentation target 1815# 1816# Using the singular to avoid running afoul of `no-dot-config-targets`. 1817PHONY += rustdoc 1818rustdoc: prepare 1819 $(Q)$(MAKE) $(build)=rust $@ 1820 1821# Testing target 1822PHONY += rusttest 1823rusttest: prepare 1824 $(Q)$(MAKE) $(build)=rust $@ 1825 1826# Formatting targets 1827PHONY += rustfmt rustfmtcheck 1828 1829rustfmt: 1830 $(Q)find $(srctree) $(RCS_FIND_IGNORE) \ 1831 -type f -a -name '*.rs' -a ! -name '*generated*' -print \ 1832 | xargs $(RUSTFMT) $(rustfmt_flags) 1833 1834rustfmtcheck: rustfmt_flags = --check 1835rustfmtcheck: rustfmt 1836 1837# Misc 1838# --------------------------------------------------------------------------- 1839 1840PHONY += misc-check 1841misc-check: 1842 $(Q)$(srctree)/scripts/misc-check 1843 1844all: misc-check 1845 1846PHONY += scripts_gdb 1847scripts_gdb: prepare0 1848 $(Q)$(MAKE) $(build)=scripts/gdb 1849 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1850 1851ifdef CONFIG_GDB_SCRIPTS 1852all: scripts_gdb 1853endif 1854 1855else # KBUILD_EXTMOD 1856 1857filechk_kernel.release = echo $(KERNELRELEASE) 1858 1859### 1860# External module support. 1861# When building external modules the kernel used as basis is considered 1862# read-only, and no consistency checks are made and the make 1863# system is not used on the basis kernel. If updates are required 1864# in the basis kernel ordinary make commands (without M=...) must be used. 1865 1866# We are always building only modules. 1867KBUILD_BUILTIN := 1868KBUILD_MODULES := 1 1869 1870build-dir := . 1871 1872clean-dirs := . 1873clean: private rm-files := Module.symvers modules.nsdeps compile_commands.json 1874 1875PHONY += prepare 1876# now expand this into a simple variable to reduce the cost of shell evaluations 1877prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1878prepare: 1879 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1880 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1881 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1882 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1883 fi 1884 1885PHONY += help 1886help: 1887 @echo ' Building external modules.' 1888 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1889 @echo '' 1890 @echo ' modules - default target, build the module(s)' 1891 @echo ' modules_install - install the module' 1892 @echo ' clean - remove generated files in module directory only' 1893 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 1894 @echo '' 1895 1896ifndef CONFIG_MODULES 1897modules modules_install: __external_modules_error 1898__external_modules_error: 1899 @echo >&2 '***' 1900 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 1901 @echo >&2 '*** You cannot build or install external modules.' 1902 @echo >&2 '***' 1903 @false 1904endif 1905 1906endif # KBUILD_EXTMOD 1907 1908# --------------------------------------------------------------------------- 1909# Modules 1910 1911PHONY += modules modules_install modules_sign modules_prepare 1912 1913modules_install: 1914 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 1915 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 1916 1917ifeq ($(CONFIG_MODULE_SIG),y) 1918# modules_sign is a subset of modules_install. 1919# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1920modules_sign: modules_install 1921 @: 1922else 1923modules_sign: 1924 @echo >&2 '***' 1925 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 1926 @echo >&2 '***' 1927 @false 1928endif 1929 1930ifdef CONFIG_MODULES 1931 1932modules.order: $(build-dir) 1933 @: 1934 1935# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1936# This is solely useful to speed up test compiles. 1937modules: modpost 1938ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1939 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1940endif 1941 1942PHONY += modules_check 1943modules_check: modules.order 1944 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1945 1946else # CONFIG_MODULES 1947 1948modules: 1949 @: 1950 1951KBUILD_MODULES := 1952 1953endif # CONFIG_MODULES 1954 1955PHONY += modpost 1956modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 1957 $(if $(KBUILD_MODULES), modules_check) 1958 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1959 1960# Single targets 1961# --------------------------------------------------------------------------- 1962# To build individual files in subdirectories, you can do like this: 1963# 1964# make foo/bar/baz.s 1965# 1966# The supported suffixes for single-target are listed in 'single-targets' 1967# 1968# To build only under specific subdirectories, you can do like this: 1969# 1970# make foo/bar/baz/ 1971 1972ifdef single-build 1973 1974# .ko is special because modpost is needed 1975single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1976single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 1977 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 1978 1979$(single-ko): single_modules 1980 @: 1981$(single-no-ko): $(build-dir) 1982 @: 1983 1984# Remove modules.order when done because it is not the real one. 1985PHONY += single_modules 1986single_modules: $(single-no-ko) modules_prepare 1987 $(Q){ $(foreach m, $(single-ko), echo $(m:%.ko=%.o);) } > modules.order 1988 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1989ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1990 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1991endif 1992 $(Q)rm -f modules.order 1993 1994single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 1995 1996KBUILD_MODULES := 1 1997 1998endif 1999 2000prepare: outputmakefile 2001 2002# Preset locale variables to speed up the build process. Limit locale 2003# tweaks to this spot to avoid wrong language settings when running 2004# make menuconfig etc. 2005# Error messages still appears in the original language 2006PHONY += $(build-dir) 2007$(build-dir): prepare 2008 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 2009 2010clean-dirs := $(addprefix _clean_, $(clean-dirs)) 2011PHONY += $(clean-dirs) clean 2012$(clean-dirs): 2013 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 2014 2015clean: $(clean-dirs) 2016 $(call cmd,rmfiles) 2017 @find . $(RCS_FIND_IGNORE) \ 2018 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 2019 -o -name '*.ko.*' \ 2020 -o -name '*.dtb' -o -name '*.dtbo' \ 2021 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 2022 -o -name '*.dt.yaml' -o -name 'dtbs-list' \ 2023 -o -name '*.dwo' -o -name '*.lst' \ 2024 -o -name '*.su' -o -name '*.mod' \ 2025 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 2026 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 2027 -o -name '*.asn1.[ch]' \ 2028 -o -name '*.symtypes' -o -name 'modules.order' \ 2029 -o -name '*.c.[012]*.*' \ 2030 -o -name '*.ll' \ 2031 -o -name '*.gcno' \ 2032 \) -type f -print \ 2033 -o -name '.tmp_*' -print \ 2034 | xargs rm -rf 2035 2036# Generate tags for editors 2037# --------------------------------------------------------------------------- 2038quiet_cmd_tags = GEN $@ 2039 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 2040 2041tags TAGS cscope gtags: FORCE 2042 $(call cmd,tags) 2043 2044# Generate rust-project.json (a file that describes the structure of non-Cargo 2045# Rust projects) for rust-analyzer (an implementation of the Language Server 2046# Protocol). 2047PHONY += rust-analyzer 2048rust-analyzer: 2049 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 2050ifdef KBUILD_EXTMOD 2051# FIXME: external modules must not descend into a sub-directory of the kernel 2052 $(Q)$(MAKE) $(build)=$(objtree)/rust src=$(srctree)/rust $@ 2053else 2054 $(Q)$(MAKE) $(build)=rust $@ 2055endif 2056 2057# Script to generate missing namespace dependencies 2058# --------------------------------------------------------------------------- 2059 2060PHONY += nsdeps 2061nsdeps: export KBUILD_NSDEPS=1 2062nsdeps: modules 2063 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 2064 2065# Clang Tooling 2066# --------------------------------------------------------------------------- 2067 2068quiet_cmd_gen_compile_commands = GEN $@ 2069 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2070 2071compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \ 2072 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2073 $(if $(CONFIG_MODULES), modules.order) FORCE 2074 $(call if_changed,gen_compile_commands) 2075 2076targets += compile_commands.json 2077 2078PHONY += clang-tidy clang-analyzer 2079 2080ifdef CONFIG_CC_IS_CLANG 2081quiet_cmd_clang_tools = CHECK $< 2082 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2083 2084clang-tidy clang-analyzer: compile_commands.json 2085 $(call cmd,clang_tools) 2086else 2087clang-tidy clang-analyzer: 2088 @echo "$@ requires CC=clang" >&2 2089 @false 2090endif 2091 2092# Scripts to check various things for consistency 2093# --------------------------------------------------------------------------- 2094 2095PHONY += includecheck versioncheck coccicheck 2096 2097includecheck: 2098 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2099 -name '*.[hcS]' -type f -print | sort \ 2100 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2101 2102versioncheck: 2103 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2104 -name '*.[hcS]' -type f -print | sort \ 2105 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2106 2107coccicheck: 2108 $(Q)$(BASH) $(srctree)/scripts/$@ 2109 2110PHONY += checkstack kernelrelease kernelversion image_name 2111 2112# UML needs a little special treatment here. It wants to use the host 2113# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2114# else wants $(ARCH), including people doing cross-builds, which means 2115# that $(SUBARCH) doesn't work here. 2116ifeq ($(ARCH), um) 2117CHECKSTACK_ARCH := $(SUBARCH) 2118else 2119CHECKSTACK_ARCH := $(ARCH) 2120endif 2121MINSTACKSIZE ?= 100 2122checkstack: 2123 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2124 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2125 2126kernelrelease: 2127 @$(filechk_kernel.release) 2128 2129kernelversion: 2130 @echo $(KERNELVERSION) 2131 2132image_name: 2133 @echo $(KBUILD_IMAGE) 2134 2135PHONY += run-command 2136run-command: 2137 $(Q)$(KBUILD_RUN_COMMAND) 2138 2139quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2140 cmd_rmfiles = rm -rf $(rm-files) 2141 2142# read saved command lines for existing targets 2143existing-targets := $(wildcard $(sort $(targets))) 2144 2145-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2146 2147endif # config-build 2148endif # mixed-build 2149endif # need-sub-make 2150 2151PHONY += FORCE 2152FORCE: 2153 2154# Declare the contents of the PHONY variable as phony. We keep that 2155# information in a variable so we can use it in if_changed and friends. 2156.PHONY: $(PHONY) 2157