1# SPDX-License-Identifier: GPL-2.0 2VERSION = 6 3PATCHLEVEL = 19 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 \ 299 run-command 300no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \ 301 image_name 302single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %/ 303 304config-build := 305mixed-build := 306need-config := 1 307may-sync-config := 1 308single-build := 309 310ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 311 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 312 need-config := 313 endif 314endif 315 316ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 317 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 318 may-sync-config := 319 endif 320endif 321 322need-compiler := $(may-sync-config) 323 324ifneq ($(KBUILD_EXTMOD),) 325 may-sync-config := 326endif 327 328ifeq ($(KBUILD_EXTMOD),) 329 ifneq ($(filter %config,$(MAKECMDGOALS)),) 330 config-build := 1 331 ifneq ($(words $(MAKECMDGOALS)),1) 332 mixed-build := 1 333 endif 334 endif 335endif 336 337# We cannot build single targets and the others at the same time 338ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 339 single-build := 1 340 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 341 mixed-build := 1 342 endif 343endif 344 345# For "make -j clean all", "make -j mrproper defconfig all", etc. 346ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 347 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 348 mixed-build := 1 349 endif 350endif 351 352# install and modules_install need also be processed one by one 353ifneq ($(filter install,$(MAKECMDGOALS)),) 354 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 355 mixed-build := 1 356 endif 357endif 358 359ifdef mixed-build 360# =========================================================================== 361# We're called with mixed targets (*config and build targets). 362# Handle them one by one. 363 364PHONY += $(MAKECMDGOALS) __build_one_by_one 365 366$(MAKECMDGOALS): __build_one_by_one 367 @: 368 369__build_one_by_one: 370 $(Q)set -e; \ 371 for i in $(MAKECMDGOALS); do \ 372 $(MAKE) -f $(srctree)/Makefile $$i; \ 373 done 374 375else # !mixed-build 376 377include $(srctree)/scripts/Kbuild.include 378 379# Read KERNELRELEASE from include/config/kernel.release (if it exists) 380KERNELRELEASE = $(call read-file, $(objtree)/include/config/kernel.release) 381KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 382export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 383 384include $(srctree)/scripts/subarch.include 385 386# Cross compiling and selecting different set of gcc/bin-utils 387# --------------------------------------------------------------------------- 388# 389# When performing cross compilation for other architectures ARCH shall be set 390# to the target architecture. (See arch/* for the possibilities). 391# ARCH can be set during invocation of make: 392# make ARCH=arm64 393# Another way is to have ARCH set in the environment. 394# The default ARCH is the host where make is executed. 395 396# CROSS_COMPILE specify the prefix used for all executables used 397# during compilation. Only gcc and related bin-utils executables 398# are prefixed with $(CROSS_COMPILE). 399# CROSS_COMPILE can be set on the command line 400# make CROSS_COMPILE=aarch64-linux-gnu- 401# Alternatively CROSS_COMPILE can be set in the environment. 402# Default value for CROSS_COMPILE is not to prefix executables 403# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 404ARCH ?= $(SUBARCH) 405 406# Architecture as present in compile.h 407UTS_MACHINE := $(ARCH) 408SRCARCH := $(ARCH) 409 410# Additional ARCH settings for x86 411ifeq ($(ARCH),i386) 412 SRCARCH := x86 413endif 414ifeq ($(ARCH),x86_64) 415 SRCARCH := x86 416endif 417 418# Additional ARCH settings for sparc 419ifeq ($(ARCH),sparc32) 420 SRCARCH := sparc 421endif 422ifeq ($(ARCH),sparc64) 423 SRCARCH := sparc 424endif 425 426# Additional ARCH settings for parisc 427ifeq ($(ARCH),parisc64) 428 SRCARCH := parisc 429endif 430 431export cross_compiling := 432ifneq ($(SRCARCH),$(SUBARCH)) 433cross_compiling := 1 434endif 435 436KCONFIG_CONFIG ?= .config 437export KCONFIG_CONFIG 438 439# SHELL used by kbuild 440CONFIG_SHELL := sh 441 442HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 443HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 444HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 445 446ifneq ($(LLVM),) 447ifneq ($(filter %/,$(LLVM)),) 448LLVM_PREFIX := $(LLVM) 449else ifneq ($(filter -%,$(LLVM)),) 450LLVM_SUFFIX := $(LLVM) 451else ifneq ($(LLVM),1) 452$(error Invalid value for LLVM, see Documentation/kbuild/llvm.rst) 453endif 454 455HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 456HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 457else 458HOSTCC = gcc 459HOSTCXX = g++ 460endif 461HOSTRUSTC = rustc 462HOSTPKG_CONFIG = pkg-config 463 464# the KERNELDOC macro needs to be exported, as scripts/Makefile.build 465# has a logic to call it 466KERNELDOC = $(srctree)/scripts/kernel-doc.py 467export KERNELDOC 468 469KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 470 -O2 -fomit-frame-pointer -std=gnu11 471KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 472KBUILD_USERLDFLAGS := $(USERLDFLAGS) 473 474# These flags apply to all Rust code in the tree, including the kernel and 475# host programs. 476export rust_common_flags := --edition=2021 \ 477 -Zbinary_dep_depinfo=y \ 478 -Astable_features \ 479 -Dnon_ascii_idents \ 480 -Dunsafe_op_in_unsafe_fn \ 481 -Wmissing_docs \ 482 -Wrust_2018_idioms \ 483 -Wunreachable_pub \ 484 -Wclippy::all \ 485 -Wclippy::as_ptr_cast_mut \ 486 -Wclippy::as_underscore \ 487 -Wclippy::cast_lossless \ 488 -Wclippy::ignored_unit_patterns \ 489 -Wclippy::mut_mut \ 490 -Wclippy::needless_bitwise_bool \ 491 -Aclippy::needless_lifetimes \ 492 -Wclippy::no_mangle_with_rust_abi \ 493 -Wclippy::ptr_as_ptr \ 494 -Wclippy::ptr_cast_constness \ 495 -Wclippy::ref_as_ptr \ 496 -Wclippy::undocumented_unsafe_blocks \ 497 -Wclippy::unnecessary_safety_comment \ 498 -Wclippy::unnecessary_safety_doc \ 499 -Wrustdoc::missing_crate_level_docs \ 500 -Wrustdoc::unescaped_backticks 501 502KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \ 503 $(HOSTCFLAGS) -I $(srctree)/scripts/include 504KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \ 505 -I $(srctree)/scripts/include 506KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 507 -Zallow-features= $(HOSTRUSTFLAGS) 508KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 509KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 510KBUILD_PROCMACROLDFLAGS := $(or $(PROCMACROLDFLAGS),$(KBUILD_HOSTLDFLAGS)) 511 512# Make variables (CC, etc...) 513CPP = $(CC) -E 514ifneq ($(LLVM),) 515CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 516LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 517AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 518NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 519OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 520OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 521READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 522STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 523else 524CC = $(CROSS_COMPILE)gcc 525LD = $(CROSS_COMPILE)ld 526AR = $(CROSS_COMPILE)ar 527NM = $(CROSS_COMPILE)nm 528OBJCOPY = $(CROSS_COMPILE)objcopy 529OBJDUMP = $(CROSS_COMPILE)objdump 530READELF = $(CROSS_COMPILE)readelf 531STRIP = $(CROSS_COMPILE)strip 532endif 533RUSTC = rustc 534RUSTDOC = rustdoc 535RUSTFMT = rustfmt 536CLIPPY_DRIVER = clippy-driver 537BINDGEN = bindgen 538PAHOLE = pahole 539RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 540LEX = flex 541YACC = bison 542AWK = awk 543INSTALLKERNEL := installkernel 544PERL = perl 545PYTHON3 = python3 546CHECK = sparse 547BASH = bash 548KGZIP = gzip 549KBZIP2 = bzip2 550KLZOP = lzop 551LZMA = lzma 552LZ4 = lz4 553XZ = xz 554ZSTD = zstd 555TAR = tar 556 557CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 558 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 559NOSTDINC_FLAGS := 560CFLAGS_MODULE = 561RUSTFLAGS_MODULE = 562AFLAGS_MODULE = 563LDFLAGS_MODULE = 564CFLAGS_KERNEL = 565RUSTFLAGS_KERNEL = 566AFLAGS_KERNEL = 567LDFLAGS_vmlinux = 568 569# Use USERINCLUDE when you must reference the UAPI directories only. 570USERINCLUDE := \ 571 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 572 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 573 -I$(srctree)/include/uapi \ 574 -I$(objtree)/include/generated/uapi \ 575 -include $(srctree)/include/linux/compiler-version.h \ 576 -include $(srctree)/include/linux/kconfig.h 577 578# Use LINUXINCLUDE when you must reference the include/ directory. 579# Needed to be compatible with the O= option 580LINUXINCLUDE := \ 581 -I$(srctree)/arch/$(SRCARCH)/include \ 582 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 583 -I$(srctree)/include \ 584 -I$(objtree)/include \ 585 $(USERINCLUDE) 586 587KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 588 589KBUILD_CFLAGS := 590KBUILD_CFLAGS += -std=gnu11 591KBUILD_CFLAGS += -fshort-wchar 592KBUILD_CFLAGS += -funsigned-char 593KBUILD_CFLAGS += -fno-common 594KBUILD_CFLAGS += -fno-PIE 595KBUILD_CFLAGS += -fno-strict-aliasing 596 597KBUILD_CPPFLAGS := -D__KERNEL__ 598KBUILD_RUSTFLAGS := $(rust_common_flags) \ 599 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 600 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 601 -Csymbol-mangling-version=v0 \ 602 -Crelocation-model=static \ 603 -Zfunction-sections=n \ 604 -Wclippy::float_arithmetic 605 606KBUILD_AFLAGS_KERNEL := 607KBUILD_CFLAGS_KERNEL := 608KBUILD_RUSTFLAGS_KERNEL := 609KBUILD_AFLAGS_MODULE := -DMODULE 610KBUILD_CFLAGS_MODULE := -DMODULE 611KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 612KBUILD_LDFLAGS_MODULE := 613KBUILD_LDFLAGS := 614CLANG_FLAGS := 615 616ifeq ($(KBUILD_CLIPPY),1) 617 RUSTC_OR_CLIPPY_QUIET := CLIPPY 618 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 619else 620 RUSTC_OR_CLIPPY_QUIET := RUSTC 621 RUSTC_OR_CLIPPY = $(RUSTC) 622endif 623 624# Allows the usage of unstable features in stable compilers. 625export RUSTC_BOOTSTRAP := 1 626 627# Allows finding `.clippy.toml` in out-of-srctree builds. 628export CLIPPY_CONF_DIR := $(srctree) 629 630export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 631export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN 632export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 633export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 634export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 635export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD TAR 636export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS KBUILD_PROCMACROLDFLAGS LDFLAGS_MODULE 637export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 638 639export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 640export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 641export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 642export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 643export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 644export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 645 646# Files to ignore in find ... statements 647 648export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 649 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 650 -prune -o 651 652# =========================================================================== 653# Rules shared between *config targets and build targets 654 655# Basic helpers built in scripts/basic/ 656PHONY += scripts_basic 657scripts_basic: 658 $(Q)$(MAKE) $(build)=scripts/basic 659 660PHONY += outputmakefile 661ifdef building_out_of_srctree 662# Before starting out-of-tree build, make sure the source tree is clean. 663# outputmakefile generates a Makefile in the output directory, if using a 664# separate output directory. This allows convenient use of make in the 665# output directory. 666# At the same time when output Makefile generated, generate .gitignore to 667# ignore whole output directory 668 669ifdef KBUILD_EXTMOD 670print_env_for_makefile = \ 671 echo "export KBUILD_OUTPUT = $(objtree)"; \ 672 echo "export KBUILD_EXTMOD = $(realpath $(srcroot))" ; \ 673 echo "export KBUILD_EXTMOD_OUTPUT = $(CURDIR)" 674else 675print_env_for_makefile = \ 676 echo "export KBUILD_OUTPUT = $(CURDIR)" 677endif 678 679quiet_cmd_makefile = GEN Makefile 680 cmd_makefile = { \ 681 echo "\# Automatically generated by $(abs_srctree)/Makefile: don't edit"; \ 682 $(print_env_for_makefile); \ 683 echo "include $(abs_srctree)/Makefile"; \ 684 } > Makefile 685 686outputmakefile: 687ifeq ($(KBUILD_EXTMOD),) 688 @if [ -f $(srctree)/.config -o \ 689 -d $(srctree)/include/config -o \ 690 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 691 echo >&2 "***"; \ 692 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 693 echo >&2 "*** in $(abs_srctree)";\ 694 echo >&2 "***"; \ 695 false; \ 696 fi 697else 698 @if [ -f $(srcroot)/modules.order ]; then \ 699 echo >&2 "***"; \ 700 echo >&2 "*** The external module source tree is not clean."; \ 701 echo >&2 "*** Please run 'make -C $(abs_srctree) M=$(realpath $(srcroot)) clean'"; \ 702 echo >&2 "***"; \ 703 false; \ 704 fi 705endif 706 $(Q)ln -fsn $(srcroot) source 707 $(call cmd,makefile) 708 $(Q)test -e .gitignore || \ 709 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 710endif 711 712# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 713# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 714# CC_VERSION_TEXT and RUSTC_VERSION_TEXT are referenced from Kconfig (so they 715# need export), and from include/config/auto.conf.cmd to detect the compiler 716# upgrade. 717CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 718RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null)) 719 720ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 721include $(srctree)/scripts/Makefile.clang 722endif 723 724# Include this also for config targets because some architectures need 725# cc-cross-prefix to determine CROSS_COMPILE. 726ifdef need-compiler 727include $(srctree)/scripts/Makefile.compiler 728endif 729 730ifdef config-build 731# =========================================================================== 732# *config targets only - make sure prerequisites are updated, and descend 733# in scripts/kconfig to make the *config target 734 735# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 736# KBUILD_DEFCONFIG may point out an alternative default configuration 737# used for 'make defconfig' 738include $(srctree)/arch/$(SRCARCH)/Makefile 739export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT RUSTC_VERSION_TEXT 740 741config: outputmakefile scripts_basic FORCE 742 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 743 744%config: outputmakefile scripts_basic FORCE 745 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 746 747else #!config-build 748# =========================================================================== 749# Build targets only - this includes vmlinux, arch-specific targets, clean 750# targets and others. In general all targets except *config targets. 751 752# If building an external module we do not care about the all: rule 753# but instead __all depend on modules 754PHONY += all 755ifeq ($(KBUILD_EXTMOD),) 756__all: all 757else 758__all: modules 759endif 760 761targets := 762 763# Decide whether to build built-in, modular, or both. 764# Normally, just do built-in. 765 766KBUILD_MODULES := 767KBUILD_BUILTIN := y 768 769# If we have only "make modules", don't compile built-in objects. 770ifeq ($(MAKECMDGOALS),modules) 771 KBUILD_BUILTIN := 772endif 773 774# If we have "make <whatever> modules", compile modules 775# in addition to whatever we do anyway. 776# Just "make" or "make all" shall build modules as well 777 778ifneq ($(filter all modules nsdeps compile_commands.json clang-%,$(MAKECMDGOALS)),) 779 KBUILD_MODULES := y 780endif 781 782ifeq ($(MAKECMDGOALS),) 783 KBUILD_MODULES := y 784endif 785 786export KBUILD_MODULES KBUILD_BUILTIN 787 788ifdef need-config 789include $(objtree)/include/config/auto.conf 790endif 791 792ifeq ($(KBUILD_EXTMOD),) 793# Objects we will link into vmlinux / subdirs we need to visit 794core-y := 795drivers-y := 796libs-y := lib/ 797endif # KBUILD_EXTMOD 798 799# The all: target is the default when no target is given on the 800# command line. 801# This allow a user to issue only 'make' to build a kernel including modules 802# Defaults to vmlinux, but the arch makefile usually adds further targets 803all: vmlinux 804 805CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 806ifdef CONFIG_CC_IS_GCC 807CFLAGS_GCOV += -fno-tree-loop-im 808endif 809export CFLAGS_GCOV 810 811# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 812ifdef CONFIG_FUNCTION_TRACER 813 CC_FLAGS_FTRACE := -pg 814endif 815 816ifdef CONFIG_TRACEPOINTS 817# To check for unused tracepoints (tracepoints that are defined but never 818# called), run with: 819# 820# make UT=1 821# 822# Each unused tracepoints can take up to 5KB of memory in the running kernel. 823# It is best to remove any that are not used. 824# 825# This command line option will be removed when all current unused 826# tracepoints are removed. 827 828ifeq ("$(origin UT)", "command line") 829 WARN_ON_UNUSED_TRACEPOINTS := $(UT) 830endif 831endif # CONFIG_TRACEPOINTS 832 833export WARN_ON_UNUSED_TRACEPOINTS 834 835include $(srctree)/arch/$(SRCARCH)/Makefile 836 837ifdef need-config 838ifdef may-sync-config 839# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 840# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 841# because some architectures define CROSS_COMPILE there. 842include include/config/auto.conf.cmd 843 844$(KCONFIG_CONFIG): 845 @echo >&2 '***' 846 @echo >&2 '*** Configuration file "$@" not found!' 847 @echo >&2 '***' 848 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 849 @echo >&2 '*** "make menuconfig" or "make xconfig").' 850 @echo >&2 '***' 851 @/bin/false 852 853# The actual configuration files used during the build are stored in 854# include/generated/ and include/config/. Update them if .config is newer than 855# include/config/auto.conf (which mirrors .config). 856# 857# This exploits the 'multi-target pattern rule' trick. 858# The syncconfig should be executed only once to make all the targets. 859# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 860# 861# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 862# so you cannot notice that Kconfig is waiting for the user input. 863%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 864 $(Q)$(kecho) " SYNC $@" 865 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 866else # !may-sync-config 867# External modules and some install targets need include/generated/autoconf.h 868# and include/config/auto.conf but do not care if they are up-to-date. 869# Use auto.conf to show the error message 870 871checked-configs := $(addprefix $(objtree)/, include/generated/autoconf.h include/generated/rustc_cfg include/config/auto.conf) 872missing-configs := $(filter-out $(wildcard $(checked-configs)), $(checked-configs)) 873 874ifdef missing-configs 875PHONY += $(objtree)/include/config/auto.conf 876 877$(objtree)/include/config/auto.conf: 878 @echo >&2 '***' 879 @echo >&2 '*** ERROR: Kernel configuration is invalid. The following files are missing:' 880 @printf >&2 '*** - %s\n' $(missing-configs) 881 @echo >&2 '*** Run "make oldconfig && make prepare" on kernel source to fix it.' 882 @echo >&2 '***' 883 @/bin/false 884endif 885 886endif # may-sync-config 887endif # need-config 888 889KBUILD_CFLAGS += -fno-delete-null-pointer-checks 890 891ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 892KBUILD_CFLAGS += -O2 893KBUILD_RUSTFLAGS += -Copt-level=2 894else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 895KBUILD_CFLAGS += -Os 896KBUILD_RUSTFLAGS += -Copt-level=s 897endif 898 899# Always set `debug-assertions` and `overflow-checks` because their default 900# depends on `opt-level` and `debug-assertions`, respectively. 901KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 902KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 903 904# Tell gcc to never replace conditional load with a non-conditional one 905ifdef CONFIG_CC_IS_GCC 906# gcc-10 renamed --param=allow-store-data-races=0 to 907# -fno-allow-store-data-races. 908KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 909KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 910endif 911 912ifdef CONFIG_READABLE_ASM 913# Disable optimizations that make assembler listings hard to read. 914# reorder blocks reorders the control in the function 915# ipa clone creates specialized cloned functions 916# partial inlining inlines only parts of functions 917KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 918endif 919 920stackp-flags-y := -fno-stack-protector 921stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 922stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 923 924KBUILD_CFLAGS += $(stackp-flags-y) 925 926ifdef CONFIG_FRAME_POINTER 927KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 928KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 929else 930# Some targets (ARM with Thumb2, for example), can't be built with frame 931# pointers. For those, we don't have FUNCTION_TRACER automatically 932# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 933# incompatible with -fomit-frame-pointer with current GCC, so we don't use 934# -fomit-frame-pointer with FUNCTION_TRACER. 935# In the Rust target specification, "frame-pointer" is set explicitly 936# to "may-omit". 937ifndef CONFIG_FUNCTION_TRACER 938KBUILD_CFLAGS += -fomit-frame-pointer 939endif 940endif 941 942# Initialize all stack variables with a 0xAA pattern. 943ifdef CONFIG_INIT_STACK_ALL_PATTERN 944KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 945endif 946 947# Initialize all stack variables with a zero value. 948ifdef CONFIG_INIT_STACK_ALL_ZERO 949KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 950ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 951# https://github.com/llvm/llvm-project/issues/44842 952CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 953export CC_AUTO_VAR_INIT_ZERO_ENABLER 954KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 955endif 956endif 957 958# Explicitly clear padding bits during variable initialization 959KBUILD_CFLAGS += $(call cc-option,-fzero-init-padding-bits=all) 960 961# While VLAs have been removed, GCC produces unreachable stack probes 962# for the randomize_kstack_offset feature. Disable it for all compilers. 963KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 964 965# Get details on warnings generated due to GCC value tracking. 966KBUILD_CFLAGS += $(call cc-option, -fdiagnostics-show-context=2) 967 968# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 969ifdef CONFIG_ZERO_CALL_USED_REGS 970KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 971endif 972 973ifdef CONFIG_FUNCTION_TRACER 974ifdef CONFIG_FTRACE_MCOUNT_USE_CC 975 CC_FLAGS_FTRACE += -mrecord-mcount 976 ifdef CONFIG_HAVE_NOP_MCOUNT 977 ifeq ($(call cc-option-yn, -mnop-mcount),y) 978 CC_FLAGS_FTRACE += -mnop-mcount 979 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 980 endif 981 endif 982endif 983ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 984 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 985 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 986 endif 987endif 988ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 989 ifdef CONFIG_HAVE_C_RECORDMCOUNT 990 BUILD_C_RECORDMCOUNT := y 991 export BUILD_C_RECORDMCOUNT 992 endif 993endif 994ifdef CONFIG_HAVE_FENTRY 995 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 996 ifeq ($(call cc-option-yn, -mfentry),y) 997 CC_FLAGS_FTRACE += -mfentry 998 CC_FLAGS_USING += -DCC_USING_FENTRY 999 endif 1000endif 1001export CC_FLAGS_FTRACE 1002KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 1003KBUILD_AFLAGS += $(CC_FLAGS_USING) 1004endif 1005 1006# We trigger additional mismatches with less inlining 1007ifdef CONFIG_DEBUG_SECTION_MISMATCH 1008KBUILD_CFLAGS += -fno-inline-functions-called-once 1009endif 1010 1011# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 1012ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 1013KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 1014KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 1015LDFLAGS_vmlinux += --gc-sections 1016endif 1017 1018ifdef CONFIG_SHADOW_CALL_STACK 1019ifndef CONFIG_DYNAMIC_SCS 1020CC_FLAGS_SCS := -fsanitize=shadow-call-stack 1021KBUILD_CFLAGS += $(CC_FLAGS_SCS) 1022KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack 1023endif 1024export CC_FLAGS_SCS 1025endif 1026 1027ifdef CONFIG_LTO_CLANG 1028ifdef CONFIG_LTO_CLANG_THIN 1029CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 1030else 1031CC_FLAGS_LTO := -flto 1032endif 1033CC_FLAGS_LTO += -fvisibility=hidden 1034 1035# Limit inlining across translation units to reduce binary size 1036KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 1037endif 1038 1039ifdef CONFIG_LTO 1040KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 1041KBUILD_AFLAGS += -fno-lto 1042export CC_FLAGS_LTO 1043endif 1044 1045ifdef CONFIG_CFI 1046CC_FLAGS_CFI := -fsanitize=kcfi 1047ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS 1048 CC_FLAGS_CFI += -fsanitize-cfi-icall-experimental-normalize-integers 1049endif 1050ifdef CONFIG_FINEIBT_BHI 1051 CC_FLAGS_CFI += -fsanitize-kcfi-arity 1052endif 1053ifdef CONFIG_RUST 1054 # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects 1055 # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS. 1056 RUSTC_FLAGS_CFI := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers 1057 KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI) 1058 export RUSTC_FLAGS_CFI 1059endif 1060KBUILD_CFLAGS += $(CC_FLAGS_CFI) 1061export CC_FLAGS_CFI 1062endif 1063 1064# Architectures can define flags to add/remove for floating-point support 1065CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT 1066export CC_FLAGS_FPU 1067export CC_FLAGS_NO_FPU 1068 1069ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 1070# Set the minimal function alignment. Use the newer GCC option 1071# -fmin-function-alignment if it is available, or fall back to -falign-funtions. 1072# See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. 1073ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT 1074KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) 1075else 1076KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 1077endif 1078endif 1079 1080# arch Makefile may override CC so keep this after arch Makefile is included 1081NOSTDINC_FLAGS += -nostdinc 1082 1083# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 1084# the kernel uses only C99 flexible arrays for dynamically sized trailing 1085# arrays. Enforce this for everything that may examine structure sizes and 1086# perform bounds checking. 1087KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 1088 1089# Allow including a tagged struct or union anonymously in another struct/union. 1090KBUILD_CFLAGS += -fms-extensions 1091 1092# disable invalid "can't wrap" optimizations for signed / pointers 1093KBUILD_CFLAGS += -fno-strict-overflow 1094 1095# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1096KBUILD_CFLAGS += -fno-stack-check 1097 1098# conserve stack if available 1099ifdef CONFIG_CC_IS_GCC 1100KBUILD_CFLAGS += -fconserve-stack 1101endif 1102 1103# Ensure compilers do not transform certain loops into calls to wcslen() 1104KBUILD_CFLAGS += -fno-builtin-wcslen 1105 1106# change __FILE__ to the relative path to the source directory 1107ifdef building_out_of_srctree 1108KBUILD_CPPFLAGS += -fmacro-prefix-map=$(srcroot)/= 1109endif 1110 1111# include additional Makefiles when needed 1112include-y := scripts/Makefile.warn 1113include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1114include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1115include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1116include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1117include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1118include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1119include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1120include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1121include-$(CONFIG_KSTACK_ERASE) += scripts/Makefile.kstack_erase 1122include-$(CONFIG_AUTOFDO_CLANG) += scripts/Makefile.autofdo 1123include-$(CONFIG_PROPELLER_CLANG) += scripts/Makefile.propeller 1124include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1125 1126include $(addprefix $(srctree)/, $(include-y)) 1127 1128# scripts/Makefile.gcc-plugins is intentionally included last. 1129# Do not add $(call cc-option,...) below this line. When you build the kernel 1130# from the clean source tree, the GCC plugins do not exist at this point. 1131 1132# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1133KBUILD_CPPFLAGS += $(KCPPFLAGS) 1134KBUILD_AFLAGS += $(KAFLAGS) 1135KBUILD_CFLAGS += $(KCFLAGS) 1136KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1137 1138KBUILD_LDFLAGS_MODULE += --build-id=sha1 1139LDFLAGS_vmlinux += --build-id=sha1 1140 1141KBUILD_LDFLAGS += -z noexecstack 1142ifeq ($(CONFIG_LD_IS_BFD),y) 1143KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1144endif 1145 1146ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1147LDFLAGS_vmlinux += -X 1148endif 1149 1150ifeq ($(CONFIG_RELR),y) 1151# ld.lld before 15 did not support -z pack-relative-relocs. 1152LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1153endif 1154 1155# We never want expected sections to be placed heuristically by the 1156# linker. All sections should be explicitly named in the linker script. 1157ifdef CONFIG_LD_ORPHAN_WARN 1158LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1159endif 1160 1161ifneq ($(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS),) 1162LDFLAGS_vmlinux += --emit-relocs --discard-none 1163endif 1164 1165# Align the architecture of userspace programs with the kernel 1166USERFLAGS_FROM_KERNEL := --target=% 1167 1168ifdef CONFIG_ARCH_USERFLAGS 1169KBUILD_USERCFLAGS += $(CONFIG_ARCH_USERFLAGS) 1170KBUILD_USERLDFLAGS += $(CONFIG_ARCH_USERFLAGS) 1171else 1172# If not overridden also inherit the bit size 1173USERFLAGS_FROM_KERNEL += -m32 -m64 1174endif 1175 1176KBUILD_USERCFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1177KBUILD_USERLDFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1178 1179# userspace programs are linked via the compiler, use the correct linker 1180ifdef CONFIG_CC_IS_CLANG 1181KBUILD_USERLDFLAGS += --ld-path=$(LD) 1182endif 1183 1184# make the checker run with the right architecture 1185CHECKFLAGS += --arch=$(ARCH) 1186 1187# insure the checker run with the right endianness 1188CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1189 1190# the checker needs the correct machine size 1191CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1192 1193# Default kernel image to build when no specific target is given. 1194# KBUILD_IMAGE may be overruled on the command line or 1195# set in the environment 1196# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1197# this default value 1198export KBUILD_IMAGE ?= vmlinux 1199 1200# 1201# INSTALL_PATH specifies where to place the updated kernel and system map 1202# images. Default is /boot, but you can set it to other values 1203export INSTALL_PATH ?= /boot 1204 1205# 1206# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1207# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1208# an argument if needed. Otherwise it defaults to the kernel install path 1209# 1210export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1211 1212# 1213# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1214# relocations required by build roots. This is not defined in the 1215# makefile but the argument can be passed to make if needed. 1216# 1217 1218MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1219export MODLIB 1220 1221PHONY += prepare0 1222 1223ifeq ($(KBUILD_EXTMOD),) 1224 1225build-dir := . 1226clean-dirs := $(sort . Documentation \ 1227 $(patsubst %/,%,$(filter %/, $(core-) \ 1228 $(drivers-) $(libs-)))) 1229 1230export ARCH_CORE := $(core-y) 1231export ARCH_LIB := $(filter %/, $(libs-y)) 1232export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1233# Externally visible symbols (used by link-vmlinux.sh) 1234 1235KBUILD_VMLINUX_OBJS := built-in.a $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1236KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1237 1238export KBUILD_VMLINUX_LIBS 1239export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1240 1241ifdef CONFIG_TRIM_UNUSED_KSYMS 1242# For the kernel to actually contain only the needed exported symbols, 1243# we have to build modules as well to determine what those symbols are. 1244KBUILD_MODULES := y 1245endif 1246 1247# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1248quiet_cmd_ar_vmlinux.a = AR $@ 1249 cmd_ar_vmlinux.a = \ 1250 rm -f $@; \ 1251 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1252 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1253 1254targets += vmlinux.a 1255vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1256 $(call if_changed,ar_vmlinux.a) 1257 1258PHONY += vmlinux_o 1259vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1260 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1261 1262vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1263 @: 1264 1265PHONY += vmlinux 1266# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1267# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1268# unrelated; the decompressors just happen to have the same base name, 1269# arch/*/boot/compressed/vmlinux. 1270# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1271# 1272# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1273# https://savannah.gnu.org/bugs/?61463 1274# For Make > 4.4, the following simple code will work: 1275# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1276vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1277vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1278vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1279 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1280 1281# The actual objects are generated when descending, 1282# make sure no implicit rule kicks in 1283$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1284 1285ifeq ($(origin KERNELRELEASE),file) 1286filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1287else 1288filechk_kernel.release = echo $(KERNELRELEASE) 1289endif 1290 1291# Store (new) KERNELRELEASE string in include/config/kernel.release 1292include/config/kernel.release: FORCE 1293 $(call filechk,kernel.release) 1294 1295# Additional helpers built in scripts/ 1296# Carefully list dependencies so we do not try to build scripts twice 1297# in parallel 1298PHONY += scripts 1299scripts: scripts_basic scripts_dtc 1300 $(Q)$(MAKE) $(build)=$(@) 1301 1302# Things we need to do before we recursively start building the kernel 1303# or the modules are listed in "prepare". 1304# A multi level approach is used. prepareN is processed before prepareN-1. 1305# archprepare is used in arch Makefiles and when processed asm symlink, 1306# version.h and scripts_basic is processed / created. 1307 1308PHONY += prepare archprepare 1309 1310archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1311 asm-generic $(version_h) include/generated/utsrelease.h \ 1312 include/generated/compile.h include/generated/autoconf.h \ 1313 include/generated/rustc_cfg remove-stale-files 1314 1315prepare0: archprepare 1316 $(Q)$(MAKE) $(build)=scripts/mod 1317 $(Q)$(MAKE) $(build)=. prepare 1318 1319# All the preparing.. 1320prepare: prepare0 1321ifdef CONFIG_RUST 1322 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1323 $(Q)$(MAKE) $(build)=rust 1324endif 1325 1326PHONY += remove-stale-files 1327remove-stale-files: 1328 $(Q)$(srctree)/scripts/remove-stale-files 1329 1330# Support for using generic headers in asm-generic 1331asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj 1332 1333PHONY += asm-generic uapi-asm-generic 1334asm-generic: uapi-asm-generic 1335 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1336 generic=include/asm-generic 1337uapi-asm-generic: 1338 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1339 generic=include/uapi/asm-generic 1340 1341# Generate some files 1342# --------------------------------------------------------------------------- 1343 1344# KERNELRELEASE can change from a few different places, meaning version.h 1345# needs to be updated, so this check is forced on all builds 1346 1347uts_len := 64 1348define filechk_utsrelease.h 1349 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1350 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1351 exit 1; \ 1352 fi; \ 1353 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1354endef 1355 1356define filechk_version.h 1357 if [ $(SUBLEVEL) -gt 255 ]; then \ 1358 echo \#define LINUX_VERSION_CODE $(shell \ 1359 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1360 else \ 1361 echo \#define LINUX_VERSION_CODE $(shell \ 1362 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1363 fi; \ 1364 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1365 ((c) > 255 ? 255 : (c)))'; \ 1366 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1367 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1368 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1369endef 1370 1371$(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1372$(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0) 1373$(version_h): FORCE 1374 $(call filechk,version.h) 1375 1376include/generated/utsrelease.h: include/config/kernel.release FORCE 1377 $(call filechk,utsrelease.h) 1378 1379filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1380 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1381 1382include/generated/compile.h: FORCE 1383 $(call filechk,compile.h) 1384 1385PHONY += headerdep 1386headerdep: 1387 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1388 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1389 1390# --------------------------------------------------------------------------- 1391# Kernel headers 1392 1393#Default location for installed headers 1394export INSTALL_HDR_PATH = $(objtree)/usr 1395 1396quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1397 cmd_headers_install = \ 1398 mkdir -p $(INSTALL_HDR_PATH); \ 1399 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1400 usr/include $(INSTALL_HDR_PATH) 1401 1402PHONY += headers_install 1403headers_install: headers 1404 $(call cmd,headers_install) 1405 1406PHONY += archheaders archscripts 1407 1408hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1409 1410PHONY += headers 1411headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders 1412ifdef HEADER_ARCH 1413 $(Q)$(MAKE) -f $(srctree)/Makefile HEADER_ARCH= SRCARCH=$(HEADER_ARCH) headers 1414else 1415 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1416 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1417endif 1418 1419ifdef CONFIG_HEADERS_INSTALL 1420prepare: headers 1421endif 1422 1423PHONY += usr_gen_init_cpio 1424usr_gen_init_cpio: scripts_basic 1425 $(Q)$(MAKE) $(build)=usr usr/gen_init_cpio 1426 1427PHONY += scripts_unifdef 1428scripts_unifdef: scripts_basic 1429 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1430 1431PHONY += scripts_gen_packed_field_checks 1432scripts_gen_packed_field_checks: scripts_basic 1433 $(Q)$(MAKE) $(build)=scripts scripts/gen_packed_field_checks 1434 1435# --------------------------------------------------------------------------- 1436# Install 1437 1438# Many distributions have the custom install script, /sbin/installkernel. 1439# If DKMS is installed, 'make install' will eventually recurse back 1440# to this Makefile to build and install external modules. 1441# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1442 1443quiet_cmd_install = INSTALL $(INSTALL_PATH) 1444 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1445 1446# --------------------------------------------------------------------------- 1447# vDSO install 1448 1449PHONY += vdso_install 1450vdso_install: export INSTALL_FILES = $(vdso-install-y) 1451vdso_install: 1452 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1453 1454# --------------------------------------------------------------------------- 1455# Tools 1456 1457ifdef CONFIG_OBJTOOL 1458prepare: tools/objtool 1459endif 1460 1461ifdef CONFIG_BPF 1462ifdef CONFIG_DEBUG_INFO_BTF 1463prepare: tools/bpf/resolve_btfids 1464endif 1465endif 1466 1467# The tools build system is not a part of Kbuild and tends to introduce 1468# its own unique issues. If you need to integrate a new tool into Kbuild, 1469# please consider locating that tool outside the tools/ tree and using the 1470# standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry 1471# here. See Documentation/kbuild/makefiles.rst for details. 1472 1473PHONY += resolve_btfids_clean 1474 1475resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1476 1477# tools/bpf/resolve_btfids directory might not exist 1478# in output directory, skip its clean in that case 1479resolve_btfids_clean: 1480ifneq ($(wildcard $(resolve_btfids_O)),) 1481 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1482endif 1483 1484tools/: FORCE 1485 $(Q)mkdir -p $(objtree)/tools 1486 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1487 1488tools/%: FORCE 1489 $(Q)mkdir -p $(objtree)/tools 1490 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1491 1492# --------------------------------------------------------------------------- 1493# Kernel selftest 1494 1495PHONY += kselftest 1496kselftest: headers 1497 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1498 1499kselftest-%: headers FORCE 1500 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1501 1502PHONY += kselftest-merge 1503kselftest-merge: 1504 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1505 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1506 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1507 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1508 1509# --------------------------------------------------------------------------- 1510# Devicetree files 1511 1512ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1513dtstree := arch/$(SRCARCH)/boot/dts 1514endif 1515 1516ifneq ($(dtstree),) 1517 1518%.dtb: dtbs_prepare 1519 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1520 1521%.dtbo: dtbs_prepare 1522 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1523 1524PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1525dtbs: dtbs_prepare 1526 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1 1527 1528# include/config/kernel.release is actually needed when installing DTBs because 1529# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1530# dtbs_install depend on it as dtbs_install may run as root. 1531dtbs_prepare: include/config/kernel.release scripts_dtc 1532 1533ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1534export CHECK_DTBS=y 1535endif 1536 1537ifneq ($(CHECK_DTBS),) 1538dtbs_prepare: dt_binding_schemas 1539endif 1540 1541dtbs_check: dtbs 1542 1543dtbs_install: 1544 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) 1545 1546ifdef CONFIG_OF_EARLY_FLATTREE 1547all: dtbs 1548endif 1549 1550ifdef CONFIG_GENERIC_BUILTIN_DTB 1551vmlinux: dtbs 1552endif 1553 1554endif 1555 1556PHONY += scripts_dtc 1557scripts_dtc: scripts_basic 1558 $(Q)$(MAKE) $(build)=scripts/dtc 1559 1560ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1561export CHECK_DTBS=y 1562endif 1563 1564PHONY += dt_binding_check dt_binding_schemas 1565dt_binding_check: dt_binding_schemas scripts_dtc 1566 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1567 1568dt_binding_schemas: 1569 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1570 1571PHONY += dt_compatible_check 1572dt_compatible_check: dt_binding_schemas 1573 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1574 1575# --------------------------------------------------------------------------- 1576# Modules 1577 1578ifdef CONFIG_MODULES 1579 1580# By default, build modules as well 1581 1582all: modules 1583 1584# When we're building modules with modversions, we need to consider 1585# the built-in objects during the descend as well, in order to 1586# make sure the checksums are up to date before we record them. 1587ifdef CONFIG_MODVERSIONS 1588 KBUILD_BUILTIN := y 1589endif 1590 1591# Build modules 1592# 1593 1594# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1595# is an exception. 1596ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1597KBUILD_BUILTIN := y 1598modules: vmlinux 1599endif 1600 1601modules: modules_prepare 1602 1603# Target to prepare building external modules 1604modules_prepare: prepare 1605 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1606 1607endif # CONFIG_MODULES 1608 1609### 1610# Cleaning is done on three levels. 1611# make clean Delete most generated files 1612# Leave enough to build external modules 1613# make mrproper Delete the current configuration, and all generated files 1614# make distclean Remove editor backup files, patch leftover files and the like 1615 1616# Directories & files removed with 'make clean' 1617CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1618 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1619 modules.builtin.ranges vmlinux.o.map vmlinux.unstripped \ 1620 compile_commands.json rust/test \ 1621 rust-project.json .vmlinux.objs .vmlinux.export.c \ 1622 .builtin-dtbs-list .builtin-dtb.S 1623 1624# Directories & files removed with 'make mrproper' 1625MRPROPER_FILES += include/config include/generated \ 1626 arch/$(SRCARCH)/include/generated .objdiff \ 1627 debian snap tar-install PKGBUILD pacman \ 1628 .config .config.old .version \ 1629 Module.symvers \ 1630 certs/signing_key.pem \ 1631 certs/x509.genkey \ 1632 vmlinux-gdb.py \ 1633 rpmbuild \ 1634 rust/libmacros.so rust/libmacros.dylib \ 1635 rust/libpin_init_internal.so rust/libpin_init_internal.dylib 1636 1637# clean - Delete most, but leave enough to build external modules 1638# 1639clean: private rm-files := $(CLEAN_FILES) 1640 1641PHONY += archclean vmlinuxclean 1642 1643vmlinuxclean: 1644 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1645 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1646 1647clean: archclean vmlinuxclean resolve_btfids_clean 1648 1649# mrproper - Delete all generated files, including .config 1650# 1651mrproper: private rm-files := $(MRPROPER_FILES) 1652mrproper-dirs := $(addprefix _mrproper_,scripts) 1653 1654PHONY += $(mrproper-dirs) mrproper 1655$(mrproper-dirs): 1656 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1657 1658mrproper: clean $(mrproper-dirs) 1659 $(call cmd,rmfiles) 1660 @find . $(RCS_FIND_IGNORE) \ 1661 \( -name '*.rmeta' \) \ 1662 -type f -print | xargs rm -f 1663 1664# distclean 1665# 1666PHONY += distclean 1667 1668distclean: mrproper 1669 @find . $(RCS_FIND_IGNORE) \ 1670 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1671 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1672 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1673 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1674 -type f -print | xargs rm -f 1675 1676 1677# Packaging of the kernel to various formats 1678# --------------------------------------------------------------------------- 1679 1680modules-cpio-pkg: usr_gen_init_cpio 1681 1682%src-pkg: FORCE 1683 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1684%pkg: include/config/kernel.release FORCE 1685 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1686 1687# Brief documentation of the typical targets used 1688# --------------------------------------------------------------------------- 1689 1690boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1691boards := $(sort $(notdir $(boards))) 1692board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1693board-dirs := $(sort $(notdir $(board-dirs:/=))) 1694 1695PHONY += help 1696help: 1697 @echo 'Cleaning targets:' 1698 @echo ' clean - Remove most generated files but keep the config and' 1699 @echo ' enough build support to build external modules' 1700 @echo ' mrproper - Remove all generated files + config + various backup files' 1701 @echo ' distclean - mrproper + remove editor backup and patch files' 1702 @echo '' 1703 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1704 @echo '' 1705 @echo 'Other generic targets:' 1706 @echo ' all - Build all targets marked with [*]' 1707 @echo '* vmlinux - Build the bare kernel' 1708 @echo '* modules - Build all modules' 1709 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1710 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1711 @echo ' dir/ - Build all files in dir and below' 1712 @echo ' dir/file.[ois] - Build specified target only' 1713 @echo ' dir/file.ll - Build the LLVM assembly file' 1714 @echo ' (requires compiler support for LLVM assembly generation)' 1715 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1716 @echo ' (requires a recent binutils and recent build (System.map))' 1717 @echo ' dir/file.ko - Build module including final link' 1718 @echo ' modules_prepare - Set up for building external modules' 1719 @echo ' tags/TAGS - Generate tags file for editors' 1720 @echo ' cscope - Generate cscope index' 1721 @echo ' gtags - Generate GNU GLOBAL index' 1722 @echo ' kernelrelease - Output the release version string (use with make -s)' 1723 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1724 @echo ' image_name - Output the image name (use with make -s)' 1725 @echo ' headers - Build ready-to-install UAPI headers in usr/include' 1726 @echo ' headers_install - Install sanitised kernel UAPI headers to INSTALL_HDR_PATH'; \ 1727 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1728 echo '' 1729 @echo 'Static analysers:' 1730 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1731 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1732 @echo ' versioncheck - Sanity check on version.h usage' 1733 @echo ' includecheck - Check for duplicate included header files' 1734 @echo ' headerdep - Detect inclusion cycles in headers' 1735 @echo ' coccicheck - Check with Coccinelle' 1736 @echo ' clang-analyzer - Check with clang static analyzer' 1737 @echo ' clang-tidy - Check with clang-tidy' 1738 @echo '' 1739 @echo 'Tools:' 1740 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1741 @echo '' 1742 @echo 'Kernel selftest:' 1743 @echo ' kselftest - Build and run kernel selftest' 1744 @echo ' Build, install, and boot kernel before' 1745 @echo ' running kselftest on it' 1746 @echo ' Run as root for full coverage' 1747 @echo ' kselftest-all - Build kernel selftest' 1748 @echo ' kselftest-install - Build and install kernel selftest' 1749 @echo ' kselftest-clean - Remove all generated kselftest files' 1750 @echo ' kselftest-merge - Merge all the config dependencies of' 1751 @echo ' kselftest to existing .config.' 1752 @echo '' 1753 @echo 'Rust targets:' 1754 @echo ' rustavailable - Checks whether the Rust toolchain is' 1755 @echo ' available and, if not, explains why.' 1756 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1757 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1758 @echo ' is formatted, printing a diff otherwise.' 1759 @echo ' rustdoc - Generate Rust documentation' 1760 @echo ' (requires kernel .config)' 1761 @echo ' rusttest - Runs the Rust tests' 1762 @echo ' (requires kernel .config; downloads external repos)' 1763 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1764 @echo ' (requires kernel .config)' 1765 @echo ' dir/file.[os] - Build specified target only' 1766 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1767 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1768 @echo ' The output is not intended to be compilable.' 1769 @echo ' dir/file.ll - Build the LLVM assembly file' 1770 @echo '' 1771 @$(if $(dtstree), \ 1772 echo 'Devicetree:'; \ 1773 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1774 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1775 echo ' dt_binding_check - Validate device tree binding documents and examples'; \ 1776 echo ' dt_binding_schemas - Build processed device tree binding schemas'; \ 1777 echo ' dtbs_check - Validate device tree source files';\ 1778 echo '') 1779 1780 @echo 'Userspace tools targets:' 1781 @echo ' use "make tools/help"' 1782 @echo ' or "cd tools; make help"' 1783 @echo '' 1784 @echo 'Kernel packaging:' 1785 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1786 @echo '' 1787 @echo 'Documentation targets:' 1788 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1789 @echo '' 1790 @echo 'Architecture-specific targets ($(SRCARCH)):' 1791 @$(or $(archhelp),\ 1792 echo ' No architecture-specific help defined for $(SRCARCH)') 1793 @echo '' 1794 @$(if $(boards), \ 1795 $(foreach b, $(boards), \ 1796 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1797 echo '') 1798 @$(if $(board-dirs), \ 1799 $(foreach b, $(board-dirs), \ 1800 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1801 printf " %-16s - Show all of the above\\n" help-boards; \ 1802 echo '') 1803 1804 @echo ' make V=n [targets] 1: verbose build' 1805 @echo ' 2: give reason for rebuild of target' 1806 @echo ' V=1 and V=2 can be combined with V=12' 1807 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1808 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1809 @echo ' (sparse by default)' 1810 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1811 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1812 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where' 1813 @echo ' 1: warnings which may be relevant and do not occur too often' 1814 @echo ' 2: warnings which occur quite often but may still be relevant' 1815 @echo ' 3: more obscure warnings, can most likely be ignored' 1816 @echo ' c: extra checks in the configuration stage (Kconfig)' 1817 @echo ' e: warnings are being treated as errors' 1818 @echo ' Multiple levels can be combined with W=12 or W=123' 1819 @echo ' make UT=1 [targets] Warn if a tracepoint is defined but not used.' 1820 @echo ' [ This will be removed when all current unused tracepoints are eliminated. ]' 1821 @$(if $(dtstree), \ 1822 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1823 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1824 ) 1825 @echo '' 1826 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1827 @echo 'For further info see the ./README file' 1828 1829 1830help-board-dirs := $(addprefix help-,$(board-dirs)) 1831 1832help-boards: $(help-board-dirs) 1833 1834boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1835 1836$(help-board-dirs): help-%: 1837 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1838 @$(if $(boards-per-dir), \ 1839 $(foreach b, $(boards-per-dir), \ 1840 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1841 echo '') 1842 1843 1844# Documentation targets 1845# --------------------------------------------------------------------------- 1846DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1847 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs mandocs \ 1848 htmldocs-redirects 1849 1850PHONY += $(DOC_TARGETS) 1851$(DOC_TARGETS): 1852 $(Q)$(MAKE) $(build)=Documentation $@ 1853 1854 1855# Rust targets 1856# --------------------------------------------------------------------------- 1857 1858# "Is Rust available?" target 1859PHONY += rustavailable 1860rustavailable: 1861 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1862 1863# Documentation target 1864# 1865# Using the singular to avoid running afoul of `no-dot-config-targets`. 1866PHONY += rustdoc 1867rustdoc: prepare 1868 $(Q)$(MAKE) $(build)=rust $@ 1869 1870# Testing target 1871PHONY += rusttest 1872rusttest: prepare 1873 $(Q)$(MAKE) $(build)=rust $@ 1874 1875# Formatting targets 1876# 1877# Generated files as well as vendored crates are skipped. 1878PHONY += rustfmt rustfmtcheck 1879 1880rustfmt: 1881 $(Q)find $(srctree) $(RCS_FIND_IGNORE) \ 1882 \( \ 1883 -path $(srctree)/rust/proc-macro2 \ 1884 -o -path $(srctree)/rust/quote \ 1885 -o -path $(srctree)/rust/syn \ 1886 \) -prune -o \ 1887 -type f -a -name '*.rs' -a ! -name '*generated*' -print \ 1888 | xargs $(RUSTFMT) $(rustfmt_flags) 1889 1890rustfmtcheck: rustfmt_flags = --check 1891rustfmtcheck: rustfmt 1892 1893# Misc 1894# --------------------------------------------------------------------------- 1895 1896PHONY += misc-check 1897misc-check: 1898 $(Q)$(srctree)/scripts/misc-check 1899 1900all: misc-check 1901 1902PHONY += scripts_gdb 1903scripts_gdb: prepare0 1904 $(Q)$(MAKE) $(build)=scripts/gdb 1905 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1906 1907ifdef CONFIG_GDB_SCRIPTS 1908all: scripts_gdb 1909endif 1910 1911else # KBUILD_EXTMOD 1912 1913filechk_kernel.release = echo $(KERNELRELEASE) 1914 1915### 1916# External module support. 1917# When building external modules the kernel used as basis is considered 1918# read-only, and no consistency checks are made and the make 1919# system is not used on the basis kernel. If updates are required 1920# in the basis kernel ordinary make commands (without M=...) must be used. 1921 1922# We are always building only modules. 1923KBUILD_BUILTIN := 1924KBUILD_MODULES := y 1925 1926build-dir := . 1927 1928clean-dirs := . 1929clean: private rm-files := Module.symvers modules.nsdeps compile_commands.json 1930 1931PHONY += prepare 1932# now expand this into a simple variable to reduce the cost of shell evaluations 1933prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1934prepare: 1935 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1936 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1937 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1938 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1939 fi 1940 1941PHONY += help 1942help: 1943 @echo ' Building external modules.' 1944 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1945 @echo '' 1946 @echo ' modules - default target, build the module(s)' 1947 @echo ' modules_install - install the module' 1948 @echo ' clean - remove generated files in module directory only' 1949 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 1950 @echo '' 1951 1952ifndef CONFIG_MODULES 1953modules modules_install: __external_modules_error 1954__external_modules_error: 1955 @echo >&2 '***' 1956 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 1957 @echo >&2 '*** You cannot build or install external modules.' 1958 @echo >&2 '***' 1959 @false 1960endif 1961 1962endif # KBUILD_EXTMOD 1963 1964# --------------------------------------------------------------------------- 1965# Modules 1966 1967PHONY += modules modules_install modules_sign modules_prepare 1968 1969modules_install: 1970 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 1971 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 1972 1973ifeq ($(CONFIG_MODULE_SIG),y) 1974# modules_sign is a subset of modules_install. 1975# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1976modules_sign: modules_install 1977 @: 1978else 1979modules_sign: 1980 @echo >&2 '***' 1981 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 1982 @echo >&2 '***' 1983 @false 1984endif 1985 1986ifdef CONFIG_MODULES 1987 1988modules.order: $(build-dir) 1989 @: 1990 1991# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1992# This is solely useful to speed up test compiles. 1993modules: modpost 1994ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1995 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1996endif 1997 1998PHONY += modules_check 1999modules_check: modules.order 2000 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 2001 2002else # CONFIG_MODULES 2003 2004modules: 2005 @: 2006 2007KBUILD_MODULES := 2008 2009endif # CONFIG_MODULES 2010 2011PHONY += modpost 2012modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 2013 $(if $(KBUILD_MODULES), modules_check) 2014 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2015 2016# Single targets 2017# --------------------------------------------------------------------------- 2018# To build individual files in subdirectories, you can do like this: 2019# 2020# make foo/bar/baz.s 2021# 2022# The supported suffixes for single-target are listed in 'single-targets' 2023# 2024# To build only under specific subdirectories, you can do like this: 2025# 2026# make foo/bar/baz/ 2027 2028ifdef single-build 2029 2030# .ko is special because modpost is needed 2031single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 2032single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 2033 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 2034 2035$(single-ko): single_modules 2036 @: 2037$(single-no-ko): $(build-dir) 2038 @: 2039 2040# Remove modules.order when done because it is not the real one. 2041PHONY += single_modules 2042single_modules: $(single-no-ko) modules_prepare 2043 $(Q){ $(foreach m, $(single-ko), echo $(m:%.ko=%.o);) } > modules.order 2044 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2045ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2046 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2047endif 2048 $(Q)rm -f modules.order 2049 2050single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 2051 2052KBUILD_MODULES := y 2053 2054endif 2055 2056prepare: outputmakefile 2057 2058# Preset locale variables to speed up the build process. Limit locale 2059# tweaks to this spot to avoid wrong language settings when running 2060# make menuconfig etc. 2061# Error messages still appears in the original language 2062PHONY += $(build-dir) 2063$(build-dir): prepare 2064 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 2065 2066clean-dirs := $(addprefix _clean_, $(clean-dirs)) 2067PHONY += $(clean-dirs) clean 2068$(clean-dirs): 2069 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 2070 2071clean: $(clean-dirs) 2072 $(call cmd,rmfiles) 2073 @find . $(RCS_FIND_IGNORE) \ 2074 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 2075 -o -name '*.ko.*' \ 2076 -o -name '*.dtb' -o -name '*.dtbo' \ 2077 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 2078 -o -name '*.dt.yaml' -o -name 'dtbs-list' \ 2079 -o -name '*.dwo' -o -name '*.lst' \ 2080 -o -name '*.su' -o -name '*.mod' \ 2081 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 2082 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 2083 -o -name '*.asn1.[ch]' \ 2084 -o -name '*.symtypes' -o -name 'modules.order' \ 2085 -o -name '*.c.[012]*.*' \ 2086 -o -name '*.ll' \ 2087 -o -name '*.gcno' \ 2088 \) -type f -print \ 2089 -o -name '.tmp_*' -print \ 2090 | xargs rm -rf 2091 2092# Generate tags for editors 2093# --------------------------------------------------------------------------- 2094quiet_cmd_tags = GEN $@ 2095 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 2096 2097tags TAGS cscope gtags: FORCE 2098 $(call cmd,tags) 2099 2100# Generate rust-project.json (a file that describes the structure of non-Cargo 2101# Rust projects) for rust-analyzer (an implementation of the Language Server 2102# Protocol). 2103PHONY += rust-analyzer 2104rust-analyzer: 2105 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 2106ifdef KBUILD_EXTMOD 2107# FIXME: external modules must not descend into a sub-directory of the kernel 2108 $(Q)$(MAKE) $(build)=$(objtree)/rust src=$(srctree)/rust $@ 2109else 2110 $(Q)$(MAKE) $(build)=rust $@ 2111endif 2112 2113# Script to generate missing namespace dependencies 2114# --------------------------------------------------------------------------- 2115 2116PHONY += nsdeps 2117nsdeps: export KBUILD_NSDEPS=1 2118nsdeps: modules 2119 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 2120 2121# Clang Tooling 2122# --------------------------------------------------------------------------- 2123 2124quiet_cmd_gen_compile_commands = GEN $@ 2125 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2126 2127compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \ 2128 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2129 $(if $(CONFIG_MODULES), modules.order) FORCE 2130 $(call if_changed,gen_compile_commands) 2131 2132targets += compile_commands.json 2133 2134PHONY += clang-tidy clang-analyzer 2135 2136ifdef CONFIG_CC_IS_CLANG 2137quiet_cmd_clang_tools = CHECK $< 2138 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2139 2140clang-tidy clang-analyzer: compile_commands.json 2141 $(call cmd,clang_tools) 2142else 2143clang-tidy clang-analyzer: 2144 @echo "$@ requires CC=clang" >&2 2145 @false 2146endif 2147 2148# Scripts to check various things for consistency 2149# --------------------------------------------------------------------------- 2150 2151PHONY += includecheck versioncheck coccicheck 2152 2153includecheck: 2154 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2155 -name '*.[hcS]' -type f -print | sort \ 2156 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2157 2158versioncheck: 2159 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2160 -name '*.[hcS]' -type f -print | sort \ 2161 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2162 2163coccicheck: 2164 $(Q)$(BASH) $(srctree)/scripts/$@ 2165 2166PHONY += checkstack kernelrelease kernelversion image_name 2167 2168# UML needs a little special treatment here. It wants to use the host 2169# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2170# else wants $(ARCH), including people doing cross-builds, which means 2171# that $(SUBARCH) doesn't work here. 2172ifeq ($(ARCH), um) 2173CHECKSTACK_ARCH := $(SUBARCH) 2174else 2175CHECKSTACK_ARCH := $(ARCH) 2176endif 2177MINSTACKSIZE ?= 100 2178checkstack: 2179 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2180 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2181 2182kernelrelease: 2183 @$(filechk_kernel.release) 2184 2185kernelversion: 2186 @echo $(KERNELVERSION) 2187 2188image_name: 2189 @echo $(KBUILD_IMAGE) 2190 2191PHONY += run-command 2192run-command: 2193 $(Q)$(KBUILD_RUN_COMMAND) 2194 2195quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2196 cmd_rmfiles = rm -rf $(rm-files) 2197 2198# read saved command lines for existing targets 2199existing-targets := $(wildcard $(sort $(targets))) 2200 2201-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2202 2203endif # config-build 2204endif # mixed-build 2205endif # need-sub-make 2206 2207PHONY += FORCE 2208FORCE: 2209 2210# Declare the contents of the PHONY variable as phony. We keep that 2211# information in a variable so we can use it in if_changed and friends. 2212.PHONY: $(PHONY) 2213