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linux-6.19.14/Makefile
1# SPDX-License-Identifier: GPL-2.0 2VERSION = 6 3PATCHLEVEL = 19 4SUBLEVEL = 14 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 -Aunused_features \ 477 -Dnon_ascii_idents \ 478 -Dunsafe_op_in_unsafe_fn \ 479 -Wmissing_docs \ 480 -Wrust_2018_idioms \ 481 -Wunreachable_pub \ 482 -Wclippy::all \ 483 -Wclippy::as_ptr_cast_mut \ 484 -Wclippy::as_underscore \ 485 -Wclippy::cast_lossless \ 486 -Wclippy::ignored_unit_patterns \ 487 -Wclippy::mut_mut \ 488 -Wclippy::needless_bitwise_bool \ 489 -Aclippy::needless_lifetimes \ 490 -Wclippy::no_mangle_with_rust_abi \ 491 -Wclippy::ptr_as_ptr \ 492 -Wclippy::ptr_cast_constness \ 493 -Wclippy::ref_as_ptr \ 494 -Wclippy::undocumented_unsafe_blocks \ 495 -Wclippy::unnecessary_safety_comment \ 496 -Wclippy::unnecessary_safety_doc \ 497 -Wrustdoc::missing_crate_level_docs \ 498 -Wrustdoc::unescaped_backticks 499 500KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \ 501 $(HOSTCFLAGS) -I $(srctree)/scripts/include 502KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \ 503 -I $(srctree)/scripts/include 504KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 505 -Zallow-features= $(HOSTRUSTFLAGS) 506KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 507KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 508KBUILD_PROCMACROLDFLAGS := $(or $(PROCMACROLDFLAGS),$(KBUILD_HOSTLDFLAGS)) 509 510# Make variables (CC, etc...) 511CPP = $(CC) -E 512ifneq ($(LLVM),) 513CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 514LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 515AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 516NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 517OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 518OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 519READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 520STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 521else 522CC = $(CROSS_COMPILE)gcc 523LD = $(CROSS_COMPILE)ld 524AR = $(CROSS_COMPILE)ar 525NM = $(CROSS_COMPILE)nm 526OBJCOPY = $(CROSS_COMPILE)objcopy 527OBJDUMP = $(CROSS_COMPILE)objdump 528READELF = $(CROSS_COMPILE)readelf 529STRIP = $(CROSS_COMPILE)strip 530endif 531RUSTC = rustc 532RUSTDOC = rustdoc 533RUSTFMT = rustfmt 534CLIPPY_DRIVER = clippy-driver 535BINDGEN = bindgen 536PAHOLE = pahole 537RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 538LEX = flex 539YACC = bison 540AWK = awk 541INSTALLKERNEL := installkernel 542PERL = perl 543PYTHON3 = python3 544CHECK = sparse 545BASH = bash 546KGZIP = gzip 547KBZIP2 = bzip2 548KLZOP = lzop 549LZMA = lzma 550LZ4 = lz4 551XZ = xz 552ZSTD = zstd 553TAR = tar 554 555CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 556 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 557NOSTDINC_FLAGS := 558CFLAGS_MODULE = 559RUSTFLAGS_MODULE = 560AFLAGS_MODULE = 561LDFLAGS_MODULE = 562CFLAGS_KERNEL = 563RUSTFLAGS_KERNEL = 564AFLAGS_KERNEL = 565LDFLAGS_vmlinux = 566 567# Use USERINCLUDE when you must reference the UAPI directories only. 568USERINCLUDE := \ 569 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 570 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 571 -I$(srctree)/include/uapi \ 572 -I$(objtree)/include/generated/uapi \ 573 -include $(srctree)/include/linux/compiler-version.h \ 574 -include $(srctree)/include/linux/kconfig.h 575 576# Use LINUXINCLUDE when you must reference the include/ directory. 577# Needed to be compatible with the O= option 578LINUXINCLUDE := \ 579 -I$(srctree)/arch/$(SRCARCH)/include \ 580 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 581 -I$(srctree)/include \ 582 -I$(objtree)/include \ 583 $(USERINCLUDE) 584 585KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 586 587KBUILD_CFLAGS := 588KBUILD_CFLAGS += -std=gnu11 589KBUILD_CFLAGS += -fshort-wchar 590KBUILD_CFLAGS += -funsigned-char 591KBUILD_CFLAGS += -fno-common 592KBUILD_CFLAGS += -fno-PIE 593KBUILD_CFLAGS += -fno-strict-aliasing 594 595KBUILD_CPPFLAGS := -D__KERNEL__ 596KBUILD_RUSTFLAGS := $(rust_common_flags) \ 597 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 598 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 599 -Csymbol-mangling-version=v0 \ 600 -Crelocation-model=static \ 601 -Zfunction-sections=n \ 602 -Wclippy::float_arithmetic 603 604KBUILD_AFLAGS_KERNEL := 605KBUILD_CFLAGS_KERNEL := 606KBUILD_RUSTFLAGS_KERNEL := 607KBUILD_AFLAGS_MODULE := -DMODULE 608KBUILD_CFLAGS_MODULE := -DMODULE 609KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 610KBUILD_LDFLAGS_MODULE := 611KBUILD_LDFLAGS := 612CLANG_FLAGS := 613 614ifeq ($(KBUILD_CLIPPY),1) 615 RUSTC_OR_CLIPPY_QUIET := CLIPPY 616 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 617else 618 RUSTC_OR_CLIPPY_QUIET := RUSTC 619 RUSTC_OR_CLIPPY = $(RUSTC) 620endif 621 622# Allows the usage of unstable features in stable compilers. 623export RUSTC_BOOTSTRAP := 1 624 625# Allows finding `.clippy.toml` in out-of-srctree builds. 626export CLIPPY_CONF_DIR := $(srctree) 627 628export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 629export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN 630export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 631export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 632export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 633export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD TAR 634export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS KBUILD_PROCMACROLDFLAGS LDFLAGS_MODULE 635export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 636 637export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 638export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 639export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 640export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 641export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 642export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 643 644# Files to ignore in find ... statements 645 646export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 647 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 648 -prune -o 649 650# =========================================================================== 651# Rules shared between *config targets and build targets 652 653# Basic helpers built in scripts/basic/ 654PHONY += scripts_basic 655scripts_basic: 656 $(Q)$(MAKE) $(build)=scripts/basic 657 658PHONY += outputmakefile 659ifdef building_out_of_srctree 660# Before starting out-of-tree build, make sure the source tree is clean. 661# outputmakefile generates a Makefile in the output directory, if using a 662# separate output directory. This allows convenient use of make in the 663# output directory. 664# At the same time when output Makefile generated, generate .gitignore to 665# ignore whole output directory 666 667ifdef KBUILD_EXTMOD 668print_env_for_makefile = \ 669 echo "export KBUILD_OUTPUT = $(objtree)"; \ 670 echo "export KBUILD_EXTMOD = $(realpath $(srcroot))" ; \ 671 echo "export KBUILD_EXTMOD_OUTPUT = $(CURDIR)" 672else 673print_env_for_makefile = \ 674 echo "export KBUILD_OUTPUT = $(CURDIR)" 675endif 676 677quiet_cmd_makefile = GEN Makefile 678 cmd_makefile = { \ 679 echo "\# Automatically generated by $(abs_srctree)/Makefile: don't edit"; \ 680 $(print_env_for_makefile); \ 681 echo "include $(abs_srctree)/Makefile"; \ 682 } > Makefile 683 684outputmakefile: 685ifeq ($(KBUILD_EXTMOD),) 686 @if [ -f $(srctree)/.config -o \ 687 -d $(srctree)/include/config -o \ 688 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 689 echo >&2 "***"; \ 690 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 691 echo >&2 "*** in $(abs_srctree)";\ 692 echo >&2 "***"; \ 693 false; \ 694 fi 695else 696 @if [ -f $(srcroot)/modules.order ]; then \ 697 echo >&2 "***"; \ 698 echo >&2 "*** The external module source tree is not clean."; \ 699 echo >&2 "*** Please run 'make -C $(abs_srctree) M=$(realpath $(srcroot)) clean'"; \ 700 echo >&2 "***"; \ 701 false; \ 702 fi 703endif 704 $(Q)ln -fsn $(srcroot) source 705 $(call cmd,makefile) 706 $(Q)test -e .gitignore || \ 707 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 708endif 709 710# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 711# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 712# CC_VERSION_TEXT and RUSTC_VERSION_TEXT are referenced from Kconfig (so they 713# need export), and from include/config/auto.conf.cmd to detect the compiler 714# upgrade. 715CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 716RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null)) 717 718ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 719include $(srctree)/scripts/Makefile.clang 720endif 721 722# Include this also for config targets because some architectures need 723# cc-cross-prefix to determine CROSS_COMPILE. 724ifdef need-compiler 725include $(srctree)/scripts/Makefile.compiler 726endif 727 728ifdef config-build 729# =========================================================================== 730# *config targets only - make sure prerequisites are updated, and descend 731# in scripts/kconfig to make the *config target 732 733# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 734# KBUILD_DEFCONFIG may point out an alternative default configuration 735# used for 'make defconfig' 736include $(srctree)/arch/$(SRCARCH)/Makefile 737export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT RUSTC_VERSION_TEXT 738 739config: outputmakefile scripts_basic FORCE 740 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 741 742%config: outputmakefile scripts_basic FORCE 743 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 744 745else #!config-build 746# =========================================================================== 747# Build targets only - this includes vmlinux, arch-specific targets, clean 748# targets and others. In general all targets except *config targets. 749 750# If building an external module we do not care about the all: rule 751# but instead __all depend on modules 752PHONY += all 753ifeq ($(KBUILD_EXTMOD),) 754__all: all 755else 756__all: modules 757endif 758 759targets := 760 761# Decide whether to build built-in, modular, or both. 762# Normally, just do built-in. 763 764KBUILD_MODULES := 765KBUILD_BUILTIN := y 766 767# If we have only "make modules", don't compile built-in objects. 768ifeq ($(MAKECMDGOALS),modules) 769 KBUILD_BUILTIN := 770endif 771 772# If we have "make <whatever> modules", compile modules 773# in addition to whatever we do anyway. 774# Just "make" or "make all" shall build modules as well 775 776ifneq ($(filter all modules nsdeps compile_commands.json clang-%,$(MAKECMDGOALS)),) 777 KBUILD_MODULES := y 778endif 779 780ifeq ($(MAKECMDGOALS),) 781 KBUILD_MODULES := y 782endif 783 784export KBUILD_MODULES KBUILD_BUILTIN 785 786ifdef need-config 787include $(objtree)/include/config/auto.conf 788endif 789 790ifeq ($(KBUILD_EXTMOD),) 791# Objects we will link into vmlinux / subdirs we need to visit 792core-y := 793drivers-y := 794libs-y := lib/ 795endif # KBUILD_EXTMOD 796 797# The all: target is the default when no target is given on the 798# command line. 799# This allow a user to issue only 'make' to build a kernel including modules 800# Defaults to vmlinux, but the arch makefile usually adds further targets 801all: vmlinux 802 803CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 804ifdef CONFIG_CC_IS_GCC 805CFLAGS_GCOV += -fno-tree-loop-im 806endif 807export CFLAGS_GCOV 808 809# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 810ifdef CONFIG_FUNCTION_TRACER 811 CC_FLAGS_FTRACE := -pg 812endif 813 814ifdef CONFIG_TRACEPOINTS 815# To check for unused tracepoints (tracepoints that are defined but never 816# called), run with: 817# 818# make UT=1 819# 820# Each unused tracepoints can take up to 5KB of memory in the running kernel. 821# It is best to remove any that are not used. 822# 823# This command line option will be removed when all current unused 824# tracepoints are removed. 825 826ifeq ("$(origin UT)", "command line") 827 WARN_ON_UNUSED_TRACEPOINTS := $(UT) 828endif 829endif # CONFIG_TRACEPOINTS 830 831export WARN_ON_UNUSED_TRACEPOINTS 832 833include $(srctree)/arch/$(SRCARCH)/Makefile 834 835ifdef need-config 836ifdef may-sync-config 837# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 838# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 839# because some architectures define CROSS_COMPILE there. 840include include/config/auto.conf.cmd 841 842$(KCONFIG_CONFIG): 843 @echo >&2 '***' 844 @echo >&2 '*** Configuration file "$@" not found!' 845 @echo >&2 '***' 846 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 847 @echo >&2 '*** "make menuconfig" or "make xconfig").' 848 @echo >&2 '***' 849 @/bin/false 850 851# The actual configuration files used during the build are stored in 852# include/generated/ and include/config/. Update them if .config is newer than 853# include/config/auto.conf (which mirrors .config). 854# 855# This exploits the 'multi-target pattern rule' trick. 856# The syncconfig should be executed only once to make all the targets. 857# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 858# 859# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 860# so you cannot notice that Kconfig is waiting for the user input. 861%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 862 $(Q)$(kecho) " SYNC $@" 863 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 864else # !may-sync-config 865# External modules and some install targets need include/generated/autoconf.h 866# and include/config/auto.conf but do not care if they are up-to-date. 867# Use auto.conf to show the error message 868 869checked-configs := $(addprefix $(objtree)/, include/generated/autoconf.h include/generated/rustc_cfg include/config/auto.conf) 870missing-configs := $(filter-out $(wildcard $(checked-configs)), $(checked-configs)) 871 872ifdef missing-configs 873PHONY += $(objtree)/include/config/auto.conf 874 875$(objtree)/include/config/auto.conf: 876 @echo >&2 '***' 877 @echo >&2 '*** ERROR: Kernel configuration is invalid. The following files are missing:' 878 @printf >&2 '*** - %s\n' $(missing-configs) 879 @echo >&2 '*** Run "make oldconfig && make prepare" on kernel source to fix it.' 880 @echo >&2 '***' 881 @/bin/false 882endif 883 884endif # may-sync-config 885endif # need-config 886 887KBUILD_CFLAGS += -fno-delete-null-pointer-checks 888 889ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 890KBUILD_CFLAGS += -O2 891KBUILD_RUSTFLAGS += -Copt-level=2 892else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 893KBUILD_CFLAGS += -Os 894KBUILD_RUSTFLAGS += -Copt-level=s 895endif 896 897# Always set `debug-assertions` and `overflow-checks` because their default 898# depends on `opt-level` and `debug-assertions`, respectively. 899KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 900KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 901 902# Tell gcc to never replace conditional load with a non-conditional one 903ifdef CONFIG_CC_IS_GCC 904# gcc-10 renamed --param=allow-store-data-races=0 to 905# -fno-allow-store-data-races. 906KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 907KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 908endif 909 910ifdef CONFIG_READABLE_ASM 911# Disable optimizations that make assembler listings hard to read. 912# reorder blocks reorders the control in the function 913# ipa clone creates specialized cloned functions 914# partial inlining inlines only parts of functions 915KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 916endif 917 918stackp-flags-y := -fno-stack-protector 919stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 920stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 921 922KBUILD_CFLAGS += $(stackp-flags-y) 923 924ifdef CONFIG_FRAME_POINTER 925KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 926KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 927else 928# Some targets (ARM with Thumb2, for example), can't be built with frame 929# pointers. For those, we don't have FUNCTION_TRACER automatically 930# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 931# incompatible with -fomit-frame-pointer with current GCC, so we don't use 932# -fomit-frame-pointer with FUNCTION_TRACER. 933# In the Rust target specification, "frame-pointer" is set explicitly 934# to "may-omit". 935ifndef CONFIG_FUNCTION_TRACER 936KBUILD_CFLAGS += -fomit-frame-pointer 937endif 938endif 939 940# Initialize all stack variables with a 0xAA pattern. 941ifdef CONFIG_INIT_STACK_ALL_PATTERN 942KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 943endif 944 945# Initialize all stack variables with a zero value. 946ifdef CONFIG_INIT_STACK_ALL_ZERO 947KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 948ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 949# https://github.com/llvm/llvm-project/issues/44842 950CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 951export CC_AUTO_VAR_INIT_ZERO_ENABLER 952KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 953endif 954endif 955 956# Explicitly clear padding bits during variable initialization 957KBUILD_CFLAGS += $(call cc-option,-fzero-init-padding-bits=all) 958 959# While VLAs have been removed, GCC produces unreachable stack probes 960# for the randomize_kstack_offset feature. Disable it for all compilers. 961KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 962 963# Get details on warnings generated due to GCC value tracking. 964KBUILD_CFLAGS += $(call cc-option, -fdiagnostics-show-context=2) 965 966# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 967ifdef CONFIG_ZERO_CALL_USED_REGS 968KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 969endif 970 971ifdef CONFIG_FUNCTION_TRACER 972ifdef CONFIG_FTRACE_MCOUNT_USE_CC 973 CC_FLAGS_FTRACE += -mrecord-mcount 974 ifdef CONFIG_HAVE_NOP_MCOUNT 975 ifeq ($(call cc-option-yn, -mnop-mcount),y) 976 CC_FLAGS_FTRACE += -mnop-mcount 977 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 978 endif 979 endif 980endif 981ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 982 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 983 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 984 endif 985endif 986ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 987 ifdef CONFIG_HAVE_C_RECORDMCOUNT 988 BUILD_C_RECORDMCOUNT := y 989 export BUILD_C_RECORDMCOUNT 990 endif 991endif 992ifdef CONFIG_HAVE_FENTRY 993 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 994 ifeq ($(call cc-option-yn, -mfentry),y) 995 CC_FLAGS_FTRACE += -mfentry 996 CC_FLAGS_USING += -DCC_USING_FENTRY 997 endif 998endif 999export CC_FLAGS_FTRACE 1000KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 1001KBUILD_AFLAGS += $(CC_FLAGS_USING) 1002endif 1003 1004# We trigger additional mismatches with less inlining 1005ifdef CONFIG_DEBUG_SECTION_MISMATCH 1006KBUILD_CFLAGS += -fno-inline-functions-called-once 1007endif 1008 1009# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 1010ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 1011KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 1012KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 1013LDFLAGS_vmlinux += --gc-sections 1014endif 1015 1016ifdef CONFIG_SHADOW_CALL_STACK 1017ifndef CONFIG_DYNAMIC_SCS 1018CC_FLAGS_SCS := -fsanitize=shadow-call-stack 1019KBUILD_CFLAGS += $(CC_FLAGS_SCS) 1020KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack 1021endif 1022export CC_FLAGS_SCS 1023endif 1024 1025ifdef CONFIG_LTO_CLANG 1026ifdef CONFIG_LTO_CLANG_THIN 1027CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 1028else 1029CC_FLAGS_LTO := -flto 1030endif 1031CC_FLAGS_LTO += -fvisibility=hidden 1032 1033# Limit inlining across translation units to reduce binary size 1034KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 1035endif 1036 1037ifdef CONFIG_LTO 1038KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 1039KBUILD_AFLAGS += -fno-lto 1040export CC_FLAGS_LTO 1041endif 1042 1043ifdef CONFIG_CFI 1044CC_FLAGS_CFI := -fsanitize=kcfi 1045ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS 1046 CC_FLAGS_CFI += -fsanitize-cfi-icall-experimental-normalize-integers 1047endif 1048ifdef CONFIG_FINEIBT_BHI 1049 CC_FLAGS_CFI += -fsanitize-kcfi-arity 1050endif 1051ifdef CONFIG_RUST 1052 # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects 1053 # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS. 1054 RUSTC_FLAGS_CFI := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers 1055 KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI) 1056 export RUSTC_FLAGS_CFI 1057endif 1058KBUILD_CFLAGS += $(CC_FLAGS_CFI) 1059export CC_FLAGS_CFI 1060endif 1061 1062# Architectures can define flags to add/remove for floating-point support 1063CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT 1064export CC_FLAGS_FPU 1065export CC_FLAGS_NO_FPU 1066 1067ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 1068# Set the minimal function alignment. Use the newer GCC option 1069# -fmin-function-alignment if it is available, or fall back to -falign-funtions. 1070# See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. 1071ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT 1072KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) 1073else 1074KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 1075endif 1076endif 1077 1078# arch Makefile may override CC so keep this after arch Makefile is included 1079NOSTDINC_FLAGS += -nostdinc 1080 1081# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 1082# the kernel uses only C99 flexible arrays for dynamically sized trailing 1083# arrays. Enforce this for everything that may examine structure sizes and 1084# perform bounds checking. 1085KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 1086 1087# Allow including a tagged struct or union anonymously in another struct/union. 1088KBUILD_CFLAGS += -fms-extensions 1089 1090# disable invalid "can't wrap" optimizations for signed / pointers 1091KBUILD_CFLAGS += -fno-strict-overflow 1092 1093# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1094KBUILD_CFLAGS += -fno-stack-check 1095 1096# conserve stack if available 1097ifdef CONFIG_CC_IS_GCC 1098KBUILD_CFLAGS += -fconserve-stack 1099endif 1100 1101# Ensure compilers do not transform certain loops into calls to wcslen() 1102KBUILD_CFLAGS += -fno-builtin-wcslen 1103 1104# change __FILE__ to the relative path to the source directory 1105ifdef building_out_of_srctree 1106KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srcroot)/=) 1107endif 1108 1109# include additional Makefiles when needed 1110include-y := scripts/Makefile.warn 1111include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1112include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1113include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1114include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1115include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1116include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1117include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1118include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1119include-$(CONFIG_KSTACK_ERASE) += scripts/Makefile.kstack_erase 1120include-$(CONFIG_AUTOFDO_CLANG) += scripts/Makefile.autofdo 1121include-$(CONFIG_PROPELLER_CLANG) += scripts/Makefile.propeller 1122include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1123 1124include $(addprefix $(srctree)/, $(include-y)) 1125 1126# scripts/Makefile.gcc-plugins is intentionally included last. 1127# Do not add $(call cc-option,...) below this line. When you build the kernel 1128# from the clean source tree, the GCC plugins do not exist at this point. 1129 1130# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1131KBUILD_CPPFLAGS += $(KCPPFLAGS) 1132KBUILD_AFLAGS += $(KAFLAGS) 1133KBUILD_CFLAGS += $(KCFLAGS) 1134KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1135 1136KBUILD_LDFLAGS_MODULE += --build-id=sha1 1137LDFLAGS_vmlinux += --build-id=sha1 1138 1139KBUILD_LDFLAGS += -z noexecstack 1140ifeq ($(CONFIG_LD_IS_BFD),y) 1141KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1142endif 1143 1144ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1145LDFLAGS_vmlinux += -X 1146endif 1147 1148ifeq ($(CONFIG_RELR),y) 1149# ld.lld before 15 did not support -z pack-relative-relocs. 1150LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1151endif 1152 1153# We never want expected sections to be placed heuristically by the 1154# linker. All sections should be explicitly named in the linker script. 1155ifdef CONFIG_LD_ORPHAN_WARN 1156LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1157endif 1158 1159ifneq ($(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS),) 1160LDFLAGS_vmlinux += --emit-relocs --discard-none 1161endif 1162 1163# Align the architecture of userspace programs with the kernel 1164USERFLAGS_FROM_KERNEL := --target=% 1165 1166ifdef CONFIG_ARCH_USERFLAGS 1167KBUILD_USERCFLAGS += $(CONFIG_ARCH_USERFLAGS) 1168KBUILD_USERLDFLAGS += $(CONFIG_ARCH_USERFLAGS) 1169else 1170# If not overridden also inherit the bit size 1171USERFLAGS_FROM_KERNEL += -m32 -m64 1172endif 1173 1174KBUILD_USERCFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1175KBUILD_USERLDFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1176 1177# userspace programs are linked via the compiler, use the correct linker 1178ifdef CONFIG_CC_IS_CLANG 1179KBUILD_USERLDFLAGS += --ld-path=$(LD) 1180endif 1181 1182# make the checker run with the right architecture 1183CHECKFLAGS += --arch=$(ARCH) 1184 1185# insure the checker run with the right endianness 1186CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1187 1188# the checker needs the correct machine size 1189CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1190 1191# Default kernel image to build when no specific target is given. 1192# KBUILD_IMAGE may be overruled on the command line or 1193# set in the environment 1194# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1195# this default value 1196export KBUILD_IMAGE ?= vmlinux 1197 1198# 1199# INSTALL_PATH specifies where to place the updated kernel and system map 1200# images. Default is /boot, but you can set it to other values 1201export INSTALL_PATH ?= /boot 1202 1203# 1204# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1205# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1206# an argument if needed. Otherwise it defaults to the kernel install path 1207# 1208export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1209 1210# 1211# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1212# relocations required by build roots. This is not defined in the 1213# makefile but the argument can be passed to make if needed. 1214# 1215 1216MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1217export MODLIB 1218 1219PHONY += prepare0 1220 1221ifeq ($(KBUILD_EXTMOD),) 1222 1223build-dir := . 1224clean-dirs := $(sort . Documentation \ 1225 $(patsubst %/,%,$(filter %/, $(core-) \ 1226 $(drivers-) $(libs-)))) 1227 1228export ARCH_CORE := $(core-y) 1229export ARCH_LIB := $(filter %/, $(libs-y)) 1230export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1231# Externally visible symbols (used by link-vmlinux.sh) 1232 1233KBUILD_VMLINUX_OBJS := built-in.a $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1234KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1235 1236export KBUILD_VMLINUX_LIBS 1237export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1238 1239ifdef CONFIG_TRIM_UNUSED_KSYMS 1240# For the kernel to actually contain only the needed exported symbols, 1241# we have to build modules as well to determine what those symbols are. 1242KBUILD_MODULES := y 1243endif 1244 1245# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1246quiet_cmd_ar_vmlinux.a = AR $@ 1247 cmd_ar_vmlinux.a = \ 1248 rm -f $@; \ 1249 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1250 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1251 1252targets += vmlinux.a 1253vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1254 $(call if_changed,ar_vmlinux.a) 1255 1256PHONY += vmlinux_o 1257vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1258 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1259 1260vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1261 @: 1262 1263PHONY += vmlinux 1264# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1265# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1266# unrelated; the decompressors just happen to have the same base name, 1267# arch/*/boot/compressed/vmlinux. 1268# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1269# 1270# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1271# https://savannah.gnu.org/bugs/?61463 1272# For Make > 4.4, the following simple code will work: 1273# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1274vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1275vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1276vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1277 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1278 1279# The actual objects are generated when descending, 1280# make sure no implicit rule kicks in 1281$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1282 1283ifeq ($(origin KERNELRELEASE),file) 1284filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1285else 1286filechk_kernel.release = echo $(KERNELRELEASE) 1287endif 1288 1289# Store (new) KERNELRELEASE string in include/config/kernel.release 1290include/config/kernel.release: FORCE 1291 $(call filechk,kernel.release) 1292 1293# Additional helpers built in scripts/ 1294# Carefully list dependencies so we do not try to build scripts twice 1295# in parallel 1296PHONY += scripts 1297scripts: scripts_basic scripts_dtc 1298 $(Q)$(MAKE) $(build)=$(@) 1299 1300# Things we need to do before we recursively start building the kernel 1301# or the modules are listed in "prepare". 1302# A multi level approach is used. prepareN is processed before prepareN-1. 1303# archprepare is used in arch Makefiles and when processed asm symlink, 1304# version.h and scripts_basic is processed / created. 1305 1306PHONY += prepare archprepare 1307 1308archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1309 asm-generic $(version_h) include/generated/utsrelease.h \ 1310 include/generated/compile.h include/generated/autoconf.h \ 1311 include/generated/rustc_cfg remove-stale-files 1312 1313prepare0: archprepare 1314 $(Q)$(MAKE) $(build)=scripts/mod 1315 $(Q)$(MAKE) $(build)=. prepare 1316 1317# All the preparing.. 1318prepare: prepare0 1319ifdef CONFIG_RUST 1320 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1321 $(Q)$(MAKE) $(build)=rust 1322endif 1323 1324PHONY += remove-stale-files 1325remove-stale-files: 1326 $(Q)$(srctree)/scripts/remove-stale-files 1327 1328# Support for using generic headers in asm-generic 1329asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj 1330 1331PHONY += asm-generic uapi-asm-generic 1332asm-generic: uapi-asm-generic 1333 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1334 generic=include/asm-generic 1335uapi-asm-generic: 1336 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1337 generic=include/uapi/asm-generic 1338 1339# Generate some files 1340# --------------------------------------------------------------------------- 1341 1342# KERNELRELEASE can change from a few different places, meaning version.h 1343# needs to be updated, so this check is forced on all builds 1344 1345uts_len := 64 1346define filechk_utsrelease.h 1347 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1348 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1349 exit 1; \ 1350 fi; \ 1351 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1352endef 1353 1354define filechk_version.h 1355 if [ $(SUBLEVEL) -gt 255 ]; then \ 1356 echo \#define LINUX_VERSION_CODE $(shell \ 1357 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1358 else \ 1359 echo \#define LINUX_VERSION_CODE $(shell \ 1360 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1361 fi; \ 1362 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1363 ((c) > 255 ? 255 : (c)))'; \ 1364 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1365 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1366 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1367endef 1368 1369$(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1370$(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0) 1371$(version_h): FORCE 1372 $(call filechk,version.h) 1373 1374include/generated/utsrelease.h: include/config/kernel.release FORCE 1375 $(call filechk,utsrelease.h) 1376 1377filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1378 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1379 1380include/generated/compile.h: FORCE 1381 $(call filechk,compile.h) 1382 1383PHONY += headerdep 1384headerdep: 1385 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1386 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1387 1388# --------------------------------------------------------------------------- 1389# Kernel headers 1390 1391#Default location for installed headers 1392export INSTALL_HDR_PATH = $(objtree)/usr 1393 1394quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1395 cmd_headers_install = \ 1396 mkdir -p $(INSTALL_HDR_PATH); \ 1397 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1398 usr/include $(INSTALL_HDR_PATH) 1399 1400PHONY += headers_install 1401headers_install: headers 1402 $(call cmd,headers_install) 1403 1404PHONY += archheaders archscripts 1405 1406hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1407 1408PHONY += headers 1409headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders 1410ifdef HEADER_ARCH 1411 $(Q)$(MAKE) -f $(srctree)/Makefile HEADER_ARCH= SRCARCH=$(HEADER_ARCH) headers 1412else 1413 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1414 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1415endif 1416 1417ifdef CONFIG_HEADERS_INSTALL 1418prepare: headers 1419endif 1420 1421PHONY += scripts_unifdef 1422scripts_unifdef: scripts_basic 1423 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1424 1425PHONY += scripts_gen_packed_field_checks 1426scripts_gen_packed_field_checks: scripts_basic 1427 $(Q)$(MAKE) $(build)=scripts scripts/gen_packed_field_checks 1428 1429# --------------------------------------------------------------------------- 1430# Install 1431 1432# Many distributions have the custom install script, /sbin/installkernel. 1433# If DKMS is installed, 'make install' will eventually recurse back 1434# to this Makefile to build and install external modules. 1435# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1436 1437quiet_cmd_install = INSTALL $(INSTALL_PATH) 1438 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1439 1440# --------------------------------------------------------------------------- 1441# vDSO install 1442 1443PHONY += vdso_install 1444vdso_install: export INSTALL_FILES = $(vdso-install-y) 1445vdso_install: 1446 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1447 1448# --------------------------------------------------------------------------- 1449# Tools 1450 1451ifdef CONFIG_OBJTOOL 1452prepare: tools/objtool 1453endif 1454 1455ifdef CONFIG_BPF 1456ifdef CONFIG_DEBUG_INFO_BTF 1457prepare: tools/bpf/resolve_btfids 1458endif 1459endif 1460 1461# The tools build system is not a part of Kbuild and tends to introduce 1462# its own unique issues. If you need to integrate a new tool into Kbuild, 1463# please consider locating that tool outside the tools/ tree and using the 1464# standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry 1465# here. See Documentation/kbuild/makefiles.rst for details. 1466 1467PHONY += resolve_btfids_clean 1468 1469resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1470 1471# tools/bpf/resolve_btfids directory might not exist 1472# in output directory, skip its clean in that case 1473resolve_btfids_clean: 1474ifneq ($(wildcard $(resolve_btfids_O)),) 1475 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1476endif 1477 1478PHONY += objtool_clean objtool_mrproper 1479 1480objtool_O = $(abspath $(objtree))/tools/objtool 1481 1482objtool_clean objtool_mrproper: 1483ifneq ($(wildcard $(objtool_O)),) 1484 $(Q)$(MAKE) -sC $(abs_srctree)/tools/objtool O=$(objtool_O) srctree=$(abs_srctree) $(patsubst objtool_%,%,$@) 1485endif 1486 1487tools/: FORCE 1488 $(Q)mkdir -p $(objtree)/tools 1489 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1490 1491tools/%: FORCE 1492 $(Q)mkdir -p $(objtree)/tools 1493 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1494 1495# --------------------------------------------------------------------------- 1496# Kernel selftest 1497 1498PHONY += kselftest 1499kselftest: headers 1500 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1501 1502kselftest-%: headers FORCE 1503 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1504 1505PHONY += kselftest-merge 1506kselftest-merge: 1507 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1508 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1509 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1510 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1511 1512# --------------------------------------------------------------------------- 1513# Devicetree files 1514 1515ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1516dtstree := arch/$(SRCARCH)/boot/dts 1517endif 1518 1519ifneq ($(dtstree),) 1520 1521%.dtb: dtbs_prepare 1522 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1523 1524%.dtbo: dtbs_prepare 1525 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1526 1527PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1528dtbs: dtbs_prepare 1529 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1 1530 1531# include/config/kernel.release is actually needed when installing DTBs because 1532# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1533# dtbs_install depend on it as dtbs_install may run as root. 1534dtbs_prepare: include/config/kernel.release scripts_dtc 1535 1536ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1537export CHECK_DTBS=y 1538endif 1539 1540ifneq ($(CHECK_DTBS),) 1541dtbs_prepare: dt_binding_schemas 1542endif 1543 1544dtbs_check: dtbs 1545 1546dtbs_install: 1547 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) 1548 1549ifdef CONFIG_OF_EARLY_FLATTREE 1550all: dtbs 1551endif 1552 1553ifdef CONFIG_GENERIC_BUILTIN_DTB 1554vmlinux: dtbs 1555endif 1556 1557endif 1558 1559PHONY += scripts_dtc 1560scripts_dtc: scripts_basic 1561 $(Q)$(MAKE) $(build)=scripts/dtc 1562 1563ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1564export CHECK_DTBS=y 1565endif 1566 1567PHONY += dt_binding_check dt_binding_schemas 1568dt_binding_check: dt_binding_schemas scripts_dtc 1569 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1570 1571dt_binding_schemas: 1572 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1573 1574PHONY += dt_compatible_check 1575dt_compatible_check: dt_binding_schemas 1576 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1577 1578# --------------------------------------------------------------------------- 1579# Modules 1580 1581ifdef CONFIG_MODULES 1582 1583# By default, build modules as well 1584 1585all: modules 1586 1587# When we're building modules with modversions, we need to consider 1588# the built-in objects during the descend as well, in order to 1589# make sure the checksums are up to date before we record them. 1590ifdef CONFIG_MODVERSIONS 1591 KBUILD_BUILTIN := y 1592endif 1593 1594# Build modules 1595# 1596 1597# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1598# is an exception. 1599ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1600KBUILD_BUILTIN := y 1601modules: vmlinux 1602endif 1603 1604modules: modules_prepare 1605 1606# Target to prepare building external modules 1607modules_prepare: prepare 1608 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1609 1610endif # CONFIG_MODULES 1611 1612### 1613# Cleaning is done on three levels. 1614# make clean Delete most generated files 1615# Leave enough to build external modules 1616# make mrproper Delete the current configuration, and all generated files 1617# make distclean Remove editor backup files, patch leftover files and the like 1618 1619# Directories & files removed with 'make clean' 1620CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1621 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1622 modules.builtin.ranges vmlinux.o.map vmlinux.unstripped \ 1623 compile_commands.json rust/test \ 1624 rust-project.json .vmlinux.objs .vmlinux.export.c \ 1625 .builtin-dtbs-list .builtin-dtbs.S 1626 1627# Directories & files removed with 'make mrproper' 1628MRPROPER_FILES += include/config include/generated \ 1629 arch/$(SRCARCH)/include/generated .objdiff \ 1630 debian snap tar-install PKGBUILD pacman \ 1631 .config .config.old .version \ 1632 Module.symvers \ 1633 certs/signing_key.pem \ 1634 certs/x509.genkey \ 1635 vmlinux-gdb.py \ 1636 rpmbuild \ 1637 rust/libmacros.so rust/libmacros.dylib \ 1638 rust/libpin_init_internal.so rust/libpin_init_internal.dylib 1639 1640# clean - Delete most, but leave enough to build external modules 1641# 1642clean: private rm-files := $(CLEAN_FILES) 1643 1644PHONY += archclean vmlinuxclean 1645 1646vmlinuxclean: 1647 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1648 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1649 1650clean: archclean vmlinuxclean resolve_btfids_clean objtool_clean 1651 1652# mrproper - Delete all generated files, including .config 1653# 1654mrproper: private rm-files := $(MRPROPER_FILES) 1655mrproper-dirs := $(addprefix _mrproper_,scripts) 1656 1657PHONY += $(mrproper-dirs) mrproper 1658$(mrproper-dirs): 1659 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1660 1661mrproper: clean objtool_mrproper $(mrproper-dirs) 1662 $(call cmd,rmfiles) 1663 @find . $(RCS_FIND_IGNORE) \ 1664 \( -name '*.rmeta' \) \ 1665 -type f -print | xargs rm -f 1666 1667# distclean 1668# 1669PHONY += distclean 1670 1671distclean: mrproper 1672 @find . $(RCS_FIND_IGNORE) \ 1673 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1674 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1675 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1676 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1677 -type f -print | xargs rm -f 1678 1679 1680# Packaging of the kernel to various formats 1681# --------------------------------------------------------------------------- 1682 1683%src-pkg: FORCE 1684 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1685%pkg: include/config/kernel.release FORCE 1686 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1687 1688# Brief documentation of the typical targets used 1689# --------------------------------------------------------------------------- 1690 1691boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1692boards := $(sort $(notdir $(boards))) 1693board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1694board-dirs := $(sort $(notdir $(board-dirs:/=))) 1695 1696PHONY += help 1697help: 1698 @echo 'Cleaning targets:' 1699 @echo ' clean - Remove most generated files but keep the config and' 1700 @echo ' enough build support to build external modules' 1701 @echo ' mrproper - Remove all generated files + config + various backup files' 1702 @echo ' distclean - mrproper + remove editor backup and patch files' 1703 @echo '' 1704 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1705 @echo '' 1706 @echo 'Other generic targets:' 1707 @echo ' all - Build all targets marked with [*]' 1708 @echo '* vmlinux - Build the bare kernel' 1709 @echo '* modules - Build all modules' 1710 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1711 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1712 @echo ' dir/ - Build all files in dir and below' 1713 @echo ' dir/file.[ois] - Build specified target only' 1714 @echo ' dir/file.ll - Build the LLVM assembly file' 1715 @echo ' (requires compiler support for LLVM assembly generation)' 1716 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1717 @echo ' (requires a recent binutils and recent build (System.map))' 1718 @echo ' dir/file.ko - Build module including final link' 1719 @echo ' modules_prepare - Set up for building external modules' 1720 @echo ' tags/TAGS - Generate tags file for editors' 1721 @echo ' cscope - Generate cscope index' 1722 @echo ' gtags - Generate GNU GLOBAL index' 1723 @echo ' kernelrelease - Output the release version string (use with make -s)' 1724 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1725 @echo ' image_name - Output the image name (use with make -s)' 1726 @echo ' headers - Build ready-to-install UAPI headers in usr/include' 1727 @echo ' headers_install - Install sanitised kernel UAPI headers to INSTALL_HDR_PATH'; \ 1728 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1729 echo '' 1730 @echo 'Static analysers:' 1731 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1732 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1733 @echo ' versioncheck - Sanity check on version.h usage' 1734 @echo ' includecheck - Check for duplicate included header files' 1735 @echo ' headerdep - Detect inclusion cycles in headers' 1736 @echo ' coccicheck - Check with Coccinelle' 1737 @echo ' clang-analyzer - Check with clang static analyzer' 1738 @echo ' clang-tidy - Check with clang-tidy' 1739 @echo '' 1740 @echo 'Tools:' 1741 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1742 @echo '' 1743 @echo 'Kernel selftest:' 1744 @echo ' kselftest - Build and run kernel selftest' 1745 @echo ' Build, install, and boot kernel before' 1746 @echo ' running kselftest on it' 1747 @echo ' Run as root for full coverage' 1748 @echo ' kselftest-all - Build kernel selftest' 1749 @echo ' kselftest-install - Build and install kernel selftest' 1750 @echo ' kselftest-clean - Remove all generated kselftest files' 1751 @echo ' kselftest-merge - Merge all the config dependencies of' 1752 @echo ' kselftest to existing .config.' 1753 @echo '' 1754 @echo 'Rust targets:' 1755 @echo ' rustavailable - Checks whether the Rust toolchain is' 1756 @echo ' available and, if not, explains why.' 1757 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1758 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1759 @echo ' is formatted, printing a diff otherwise.' 1760 @echo ' rustdoc - Generate Rust documentation' 1761 @echo ' (requires kernel .config)' 1762 @echo ' rusttest - Runs the Rust tests' 1763 @echo ' (requires kernel .config; downloads external repos)' 1764 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1765 @echo ' (requires kernel .config)' 1766 @echo ' dir/file.[os] - Build specified target only' 1767 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1768 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1769 @echo ' The output is not intended to be compilable.' 1770 @echo ' dir/file.ll - Build the LLVM assembly file' 1771 @echo '' 1772 @$(if $(dtstree), \ 1773 echo 'Devicetree:'; \ 1774 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1775 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1776 echo ' dt_binding_check - Validate device tree binding documents and examples'; \ 1777 echo ' dt_binding_schemas - Build processed device tree binding schemas'; \ 1778 echo ' dtbs_check - Validate device tree source files';\ 1779 echo '') 1780 1781 @echo 'Userspace tools targets:' 1782 @echo ' use "make tools/help"' 1783 @echo ' or "cd tools; make help"' 1784 @echo '' 1785 @echo 'Kernel packaging:' 1786 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1787 @echo '' 1788 @echo 'Documentation targets:' 1789 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1790 @echo '' 1791 @echo 'Architecture-specific targets ($(SRCARCH)):' 1792 @$(or $(archhelp),\ 1793 echo ' No architecture-specific help defined for $(SRCARCH)') 1794 @echo '' 1795 @$(if $(boards), \ 1796 $(foreach b, $(boards), \ 1797 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1798 echo '') 1799 @$(if $(board-dirs), \ 1800 $(foreach b, $(board-dirs), \ 1801 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1802 printf " %-16s - Show all of the above\\n" help-boards; \ 1803 echo '') 1804 1805 @echo ' make V=n [targets] 1: verbose build' 1806 @echo ' 2: give reason for rebuild of target' 1807 @echo ' V=1 and V=2 can be combined with V=12' 1808 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1809 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1810 @echo ' (sparse by default)' 1811 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1812 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1813 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where' 1814 @echo ' 1: warnings which may be relevant and do not occur too often' 1815 @echo ' 2: warnings which occur quite often but may still be relevant' 1816 @echo ' 3: more obscure warnings, can most likely be ignored' 1817 @echo ' c: extra checks in the configuration stage (Kconfig)' 1818 @echo ' e: warnings are being treated as errors' 1819 @echo ' Multiple levels can be combined with W=12 or W=123' 1820 @echo ' make UT=1 [targets] Warn if a tracepoint is defined but not used.' 1821 @echo ' [ This will be removed when all current unused tracepoints are eliminated. ]' 1822 @$(if $(dtstree), \ 1823 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1824 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1825 ) 1826 @echo '' 1827 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1828 @echo 'For further info see the ./README file' 1829 1830 1831help-board-dirs := $(addprefix help-,$(board-dirs)) 1832 1833help-boards: $(help-board-dirs) 1834 1835boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1836 1837$(help-board-dirs): help-%: 1838 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1839 @$(if $(boards-per-dir), \ 1840 $(foreach b, $(boards-per-dir), \ 1841 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1842 echo '') 1843 1844 1845# Documentation targets 1846# --------------------------------------------------------------------------- 1847DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1848 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs mandocs \ 1849 htmldocs-redirects 1850 1851PHONY += $(DOC_TARGETS) 1852$(DOC_TARGETS): 1853 $(Q)$(MAKE) $(build)=Documentation $@ 1854 1855 1856# Rust targets 1857# --------------------------------------------------------------------------- 1858 1859# "Is Rust available?" target 1860PHONY += rustavailable 1861rustavailable: 1862 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1863 1864# Documentation target 1865# 1866# Using the singular to avoid running afoul of `no-dot-config-targets`. 1867PHONY += rustdoc 1868rustdoc: prepare 1869 $(Q)$(MAKE) $(build)=rust $@ 1870 1871# Testing target 1872PHONY += rusttest 1873rusttest: prepare 1874 $(Q)$(MAKE) $(build)=rust $@ 1875 1876# Formatting targets 1877# 1878# Generated files as well as vendored crates are skipped. 1879PHONY += rustfmt rustfmtcheck 1880 1881rustfmt: 1882 $(Q)find $(srctree) $(RCS_FIND_IGNORE) \ 1883 \( \ 1884 -path $(srctree)/rust/proc-macro2 \ 1885 -o -path $(srctree)/rust/quote \ 1886 -o -path $(srctree)/rust/syn \ 1887 \) -prune -o \ 1888 -type f -a -name '*.rs' -a ! -name '*generated*' -print \ 1889 | xargs $(RUSTFMT) $(rustfmt_flags) 1890 1891rustfmtcheck: rustfmt_flags = --check 1892rustfmtcheck: rustfmt 1893 1894# Misc 1895# --------------------------------------------------------------------------- 1896 1897PHONY += misc-check 1898misc-check: 1899 $(Q)$(srctree)/scripts/misc-check 1900 1901all: misc-check 1902 1903PHONY += scripts_gdb 1904scripts_gdb: prepare0 1905 $(Q)$(MAKE) $(build)=scripts/gdb 1906 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1907 1908ifdef CONFIG_GDB_SCRIPTS 1909all: scripts_gdb 1910endif 1911 1912else # KBUILD_EXTMOD 1913 1914filechk_kernel.release = echo $(KERNELRELEASE) 1915 1916### 1917# External module support. 1918# When building external modules the kernel used as basis is considered 1919# read-only, and no consistency checks are made and the make 1920# system is not used on the basis kernel. If updates are required 1921# in the basis kernel ordinary make commands (without M=...) must be used. 1922 1923# We are always building only modules. 1924KBUILD_BUILTIN := 1925KBUILD_MODULES := y 1926 1927build-dir := . 1928 1929clean-dirs := . 1930clean: private rm-files := Module.symvers modules.nsdeps compile_commands.json 1931 1932PHONY += prepare 1933# now expand this into a simple variable to reduce the cost of shell evaluations 1934prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1935prepare: 1936 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1937 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1938 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1939 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1940 fi 1941 1942PHONY += help 1943help: 1944 @echo ' Building external modules.' 1945 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1946 @echo '' 1947 @echo ' modules - default target, build the module(s)' 1948 @echo ' modules_install - install the module' 1949 @echo ' clean - remove generated files in module directory only' 1950 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 1951 @echo '' 1952 1953ifndef CONFIG_MODULES 1954modules modules_install: __external_modules_error 1955__external_modules_error: 1956 @echo >&2 '***' 1957 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 1958 @echo >&2 '*** You cannot build or install external modules.' 1959 @echo >&2 '***' 1960 @false 1961endif 1962 1963endif # KBUILD_EXTMOD 1964 1965# --------------------------------------------------------------------------- 1966# Modules 1967 1968PHONY += modules modules_install modules_sign modules_prepare 1969 1970modules_install: 1971 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 1972 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 1973 1974ifeq ($(CONFIG_MODULE_SIG),y) 1975# modules_sign is a subset of modules_install. 1976# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1977modules_sign: modules_install 1978 @: 1979else 1980modules_sign: 1981 @echo >&2 '***' 1982 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 1983 @echo >&2 '***' 1984 @false 1985endif 1986 1987ifdef CONFIG_MODULES 1988 1989modules.order: $(build-dir) 1990 @: 1991 1992# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1993# This is solely useful to speed up test compiles. 1994modules: modpost 1995ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1996 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1997endif 1998 1999PHONY += modules_check 2000modules_check: modules.order 2001 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 2002 2003else # CONFIG_MODULES 2004 2005modules: 2006 @: 2007 2008KBUILD_MODULES := 2009 2010endif # CONFIG_MODULES 2011 2012PHONY += modpost 2013modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 2014 $(if $(KBUILD_MODULES), modules_check) 2015 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2016 2017# Single targets 2018# --------------------------------------------------------------------------- 2019# To build individual files in subdirectories, you can do like this: 2020# 2021# make foo/bar/baz.s 2022# 2023# The supported suffixes for single-target are listed in 'single-targets' 2024# 2025# To build only under specific subdirectories, you can do like this: 2026# 2027# make foo/bar/baz/ 2028 2029ifdef single-build 2030 2031# .ko is special because modpost is needed 2032single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 2033single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 2034 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 2035 2036$(single-ko): single_modules 2037 @: 2038$(single-no-ko): $(build-dir) 2039 @: 2040 2041# Remove modules.order when done because it is not the real one. 2042PHONY += single_modules 2043single_modules: $(single-no-ko) modules_prepare 2044 $(Q){ $(foreach m, $(single-ko), echo $(m:%.ko=%.o);) } > modules.order 2045 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2046ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2047 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2048endif 2049 $(Q)rm -f modules.order 2050 2051single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 2052 2053KBUILD_MODULES := y 2054 2055endif 2056 2057prepare: outputmakefile 2058 2059# Preset locale variables to speed up the build process. Limit locale 2060# tweaks to this spot to avoid wrong language settings when running 2061# make menuconfig etc. 2062# Error messages still appears in the original language 2063PHONY += $(build-dir) 2064$(build-dir): prepare 2065 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 2066 2067clean-dirs := $(addprefix _clean_, $(clean-dirs)) 2068PHONY += $(clean-dirs) clean 2069$(clean-dirs): 2070 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 2071 2072clean: $(clean-dirs) 2073 $(call cmd,rmfiles) 2074 @find . $(RCS_FIND_IGNORE) \ 2075 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 2076 -o -name '*.ko.*' \ 2077 -o -name '*.dtb' -o -name '*.dtbo' \ 2078 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 2079 -o -name '*.dt.yaml' -o -name 'dtbs-list' \ 2080 -o -name '*.dwo' -o -name '*.lst' \ 2081 -o -name '*.su' -o -name '*.mod' \ 2082 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 2083 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 2084 -o -name '*.asn1.[ch]' \ 2085 -o -name '*.symtypes' -o -name 'modules.order' \ 2086 -o -name '*.c.[012]*.*' \ 2087 -o -name '*.ll' \ 2088 -o -name '*.gcno' \ 2089 \) -type f -print \ 2090 -o -name '.tmp_*' -print \ 2091 | xargs rm -rf 2092 2093# Generate tags for editors 2094# --------------------------------------------------------------------------- 2095quiet_cmd_tags = GEN $@ 2096 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 2097 2098tags TAGS cscope gtags: FORCE 2099 $(call cmd,tags) 2100 2101# Generate rust-project.json (a file that describes the structure of non-Cargo 2102# Rust projects) for rust-analyzer (an implementation of the Language Server 2103# Protocol). 2104PHONY += rust-analyzer 2105rust-analyzer: 2106 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 2107ifdef KBUILD_EXTMOD 2108# FIXME: external modules must not descend into a sub-directory of the kernel 2109 $(Q)$(MAKE) $(build)=$(objtree)/rust src=$(srctree)/rust $@ 2110else 2111 $(Q)$(MAKE) $(build)=rust $@ 2112endif 2113 2114# Script to generate missing namespace dependencies 2115# --------------------------------------------------------------------------- 2116 2117PHONY += nsdeps 2118nsdeps: export KBUILD_NSDEPS=1 2119nsdeps: modules 2120 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 2121 2122# Clang Tooling 2123# --------------------------------------------------------------------------- 2124 2125quiet_cmd_gen_compile_commands = GEN $@ 2126 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2127 2128compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \ 2129 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2130 $(if $(CONFIG_MODULES), modules.order) FORCE 2131 $(call if_changed,gen_compile_commands) 2132 2133targets += compile_commands.json 2134 2135PHONY += clang-tidy clang-analyzer 2136 2137ifdef CONFIG_CC_IS_CLANG 2138quiet_cmd_clang_tools = CHECK $< 2139 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2140 2141clang-tidy clang-analyzer: compile_commands.json 2142 $(call cmd,clang_tools) 2143else 2144clang-tidy clang-analyzer: 2145 @echo "$@ requires CC=clang" >&2 2146 @false 2147endif 2148 2149# Scripts to check various things for consistency 2150# --------------------------------------------------------------------------- 2151 2152PHONY += includecheck versioncheck coccicheck 2153 2154includecheck: 2155 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2156 -name '*.[hcS]' -type f -print | sort \ 2157 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2158 2159versioncheck: 2160 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2161 -name '*.[hcS]' -type f -print | sort \ 2162 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2163 2164coccicheck: 2165 $(Q)$(BASH) $(srctree)/scripts/$@ 2166 2167PHONY += checkstack kernelrelease kernelversion image_name 2168 2169# UML needs a little special treatment here. It wants to use the host 2170# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2171# else wants $(ARCH), including people doing cross-builds, which means 2172# that $(SUBARCH) doesn't work here. 2173ifeq ($(ARCH), um) 2174CHECKSTACK_ARCH := $(SUBARCH) 2175else 2176CHECKSTACK_ARCH := $(ARCH) 2177endif 2178MINSTACKSIZE ?= 100 2179checkstack: 2180 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2181 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2182 2183kernelrelease: 2184 @$(filechk_kernel.release) 2185 2186kernelversion: 2187 @echo $(KERNELVERSION) 2188 2189image_name: 2190 @echo $(KBUILD_IMAGE) 2191 2192PHONY += run-command 2193run-command: 2194 $(Q)$(KBUILD_RUN_COMMAND) 2195 2196quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2197 cmd_rmfiles = rm -rf $(rm-files) 2198 2199# read saved command lines for existing targets 2200existing-targets := $(wildcard $(sort $(targets))) 2201 2202-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2203 2204endif # config-build 2205endif # mixed-build 2206endif # need-sub-make 2207 2208PHONY += FORCE 2209FORCE: 2210 2211# Declare the contents of the PHONY variable as phony. We keep that 2212# information in a variable so we can use it in if_changed and friends. 2213.PHONY: $(PHONY)
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