1# SPDX-License-Identifier: GPL-2.0 2VERSION = 7 3PATCHLEVEL = 1 4SUBLEVEL = 0 5EXTRAVERSION = -rc5 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)/tools/docs/kernel-doc 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 -Aunused_features \ 480 -Dnon_ascii_idents \ 481 -Dunsafe_op_in_unsafe_fn \ 482 -Wmissing_docs \ 483 -Wrust_2018_idioms \ 484 -Wunreachable_pub \ 485 -Wclippy::all \ 486 -Wclippy::as_ptr_cast_mut \ 487 -Wclippy::as_underscore \ 488 -Wclippy::cast_lossless \ 489 -Aclippy::collapsible_if \ 490 -Aclippy::collapsible_match \ 491 -Wclippy::ignored_unit_patterns \ 492 -Aclippy::incompatible_msrv \ 493 -Wclippy::mut_mut \ 494 -Wclippy::needless_bitwise_bool \ 495 -Aclippy::needless_lifetimes \ 496 -Wclippy::no_mangle_with_rust_abi \ 497 -Wclippy::ptr_as_ptr \ 498 -Wclippy::ptr_cast_constness \ 499 -Wclippy::ref_as_ptr \ 500 -Wclippy::undocumented_unsafe_blocks \ 501 -Aclippy::uninlined_format_args \ 502 -Wclippy::unnecessary_safety_comment \ 503 -Wclippy::unnecessary_safety_doc \ 504 -Wrustdoc::missing_crate_level_docs \ 505 -Wrustdoc::unescaped_backticks 506 507KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \ 508 $(HOSTCFLAGS) -I $(srctree)/scripts/include 509KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \ 510 -I $(srctree)/scripts/include 511KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 512 -Zallow-features= 513KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 514KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 515KBUILD_PROCMACROLDFLAGS := $(or $(PROCMACROLDFLAGS),$(KBUILD_HOSTLDFLAGS)) 516 517# Make variables (CC, etc...) 518CPP = $(CC) -E 519ifneq ($(LLVM),) 520CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 521LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 522AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 523LLVM_LINK = $(LLVM_PREFIX)llvm-link$(LLVM_SUFFIX) 524NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 525OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 526OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 527READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 528STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 529else 530CC = $(CROSS_COMPILE)gcc 531LD = $(CROSS_COMPILE)ld 532AR = $(CROSS_COMPILE)ar 533NM = $(CROSS_COMPILE)nm 534OBJCOPY = $(CROSS_COMPILE)objcopy 535OBJDUMP = $(CROSS_COMPILE)objdump 536READELF = $(CROSS_COMPILE)readelf 537STRIP = $(CROSS_COMPILE)strip 538endif 539RUSTC = rustc 540RUSTDOC = rustdoc 541RUSTFMT = rustfmt 542CLIPPY_DRIVER = clippy-driver 543BINDGEN = bindgen 544PAHOLE = pahole 545RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 546LEX = flex 547YACC = bison 548AWK = awk 549INSTALLKERNEL := installkernel 550PERL = perl 551PYTHON3 = python3 552CHECK = sparse 553BASH = bash 554KGZIP = gzip 555KBZIP2 = bzip2 556KLZOP = lzop 557LZMA = lzma 558LZ4 = lz4 559XZ = xz 560ZSTD = zstd 561TAR = tar 562 563CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 564 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 565NOSTDINC_FLAGS := 566CFLAGS_MODULE = 567RUSTFLAGS_MODULE = 568AFLAGS_MODULE = 569LDFLAGS_MODULE = 570CFLAGS_KERNEL = 571RUSTFLAGS_KERNEL = 572AFLAGS_KERNEL = 573LDFLAGS_vmlinux = 574 575# Use USERINCLUDE when you must reference the UAPI directories only. 576USERINCLUDE := \ 577 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 578 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 579 -I$(srctree)/include/uapi \ 580 -I$(objtree)/include/generated/uapi \ 581 -include $(srctree)/include/linux/compiler-version.h \ 582 -include $(srctree)/include/linux/kconfig.h 583 584# Use LINUXINCLUDE when you must reference the include/ directory. 585# Needed to be compatible with the O= option 586LINUXINCLUDE := \ 587 -I$(srctree)/arch/$(SRCARCH)/include \ 588 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 589 -I$(srctree)/include \ 590 -I$(objtree)/include \ 591 $(USERINCLUDE) 592 593KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 594 595KBUILD_CFLAGS := 596KBUILD_CFLAGS += -fshort-wchar 597KBUILD_CFLAGS += -funsigned-char 598KBUILD_CFLAGS += -fno-common 599KBUILD_CFLAGS += -fno-PIE 600KBUILD_CFLAGS += -fno-strict-aliasing 601 602KBUILD_CPPFLAGS := -D__KERNEL__ 603KBUILD_RUSTFLAGS := $(rust_common_flags) \ 604 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 605 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 606 -Csymbol-mangling-version=v0 \ 607 -Crelocation-model=static \ 608 -Zfunction-sections=n \ 609 -Wclippy::float_arithmetic 610 611KBUILD_AFLAGS_KERNEL := 612KBUILD_CFLAGS_KERNEL := 613KBUILD_RUSTFLAGS_KERNEL := 614KBUILD_AFLAGS_MODULE := -DMODULE 615KBUILD_CFLAGS_MODULE := -DMODULE 616KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 617KBUILD_LDFLAGS_MODULE := 618KBUILD_LDFLAGS := 619CLANG_FLAGS := 620 621ifeq ($(KBUILD_CLIPPY),1) 622 RUSTC_OR_CLIPPY_QUIET := CLIPPY 623 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 624else 625 RUSTC_OR_CLIPPY_QUIET := RUSTC 626 RUSTC_OR_CLIPPY = $(RUSTC) 627endif 628 629# Allows the usage of unstable features in stable compilers. 630export RUSTC_BOOTSTRAP := 1 631 632# Allows finding `.clippy.toml` in out-of-srctree builds. 633export CLIPPY_CONF_DIR := $(srctree) 634 635export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 636export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN LLVM_LINK 637export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 638export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 639export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 640export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD TAR 641export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS KBUILD_PROCMACROLDFLAGS LDFLAGS_MODULE 642export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 643 644export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 645export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 646export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 647export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 648export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 649export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 650 651# Files to ignore in find ... statements 652 653export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 654 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 655 -prune -o 656 657# =========================================================================== 658# Rules shared between *config targets and build targets 659 660# Basic helpers built in scripts/basic/ 661PHONY += scripts_basic 662scripts_basic: KBUILD_HOSTCFLAGS := $(KBUILD_HOSTCFLAGS) 663scripts_basic: KBUILD_HOSTLDFLAGS := $(KBUILD_HOSTLDFLAGS) 664scripts_basic: 665 $(Q)$(MAKE) $(build)=scripts/basic 666 667PHONY += outputmakefile 668ifdef building_out_of_srctree 669# Before starting out-of-tree build, make sure the source tree is clean. 670# outputmakefile generates a Makefile in the output directory, if using a 671# separate output directory. This allows convenient use of make in the 672# output directory. 673# At the same time when output Makefile generated, generate .gitignore to 674# ignore whole output directory 675 676ifdef KBUILD_EXTMOD 677print_env_for_makefile = \ 678 echo "export KBUILD_OUTPUT = $(objtree)"; \ 679 echo "export KBUILD_EXTMOD = $(realpath $(srcroot))" ; \ 680 echo "export KBUILD_EXTMOD_OUTPUT = $(CURDIR)" 681else 682print_env_for_makefile = \ 683 echo "export KBUILD_OUTPUT = $(CURDIR)" 684endif 685 686filechk_makefile = { \ 687 echo "\# Automatically generated by $(abs_srctree)/Makefile: don't edit"; \ 688 $(print_env_for_makefile); \ 689 echo "include $(abs_srctree)/Makefile"; \ 690 } 691 692$(objtree)/Makefile: FORCE 693 $(call filechk,makefile) 694 695# Prevent $(srcroot)/Makefile from inhibiting the rule to run. 696PHONY += $(objtree)/Makefile 697 698outputmakefile: $(objtree)/Makefile 699ifeq ($(KBUILD_EXTMOD),) 700 @if [ -f $(srctree)/.config -o \ 701 -d $(srctree)/include/config -o \ 702 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 703 echo >&2 "***"; \ 704 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 705 echo >&2 "*** in $(abs_srctree)";\ 706 echo >&2 "***"; \ 707 false; \ 708 fi 709else 710 @if [ -f $(srcroot)/modules.order ]; then \ 711 echo >&2 "***"; \ 712 echo >&2 "*** The external module source tree is not clean."; \ 713 echo >&2 "*** Please run 'make -C $(abs_srctree) M=$(realpath $(srcroot)) clean'"; \ 714 echo >&2 "***"; \ 715 false; \ 716 fi 717endif 718 $(Q)ln -fsn $(srcroot) source 719 $(Q)test -e .gitignore || \ 720 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 721endif 722 723# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 724# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 725# CC_VERSION_TEXT, RUSTC_VERSION_TEXT and PAHOLE_VERSION are referenced from 726# Kconfig (so they need export), and from include/config/auto.conf.cmd to 727# detect the version changes between builds. 728CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 729RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null)) 730PAHOLE_VERSION = $(shell $(srctree)/scripts/pahole-version.sh $(PAHOLE)) 731 732ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 733include $(srctree)/scripts/Makefile.clang 734endif 735 736# Include this also for config targets because some architectures need 737# cc-cross-prefix to determine CROSS_COMPILE. 738ifdef need-compiler 739include $(srctree)/scripts/Makefile.compiler 740endif 741 742ifdef config-build 743# =========================================================================== 744# *config targets only - make sure prerequisites are updated, and descend 745# in scripts/kconfig to make the *config target 746 747# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 748# KBUILD_DEFCONFIG may point out an alternative default configuration 749# used for 'make defconfig' 750include $(srctree)/arch/$(SRCARCH)/Makefile 751export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT RUSTC_VERSION_TEXT PAHOLE_VERSION 752 753config: outputmakefile scripts_basic FORCE 754 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 755 756%config: outputmakefile scripts_basic FORCE 757 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 758 759else #!config-build 760# =========================================================================== 761# Build targets only - this includes vmlinux, arch-specific targets, clean 762# targets and others. In general all targets except *config targets. 763 764# If building an external module we do not care about the all: rule 765# but instead __all depend on modules 766PHONY += all 767ifeq ($(KBUILD_EXTMOD),) 768__all: all 769else 770__all: modules 771endif 772 773targets := 774 775# Decide whether to build built-in, modular, or both. 776# Normally, just do built-in. 777 778KBUILD_MODULES := 779KBUILD_BUILTIN := y 780 781# If we have only "make modules", don't compile built-in objects. 782ifeq ($(MAKECMDGOALS),modules) 783 KBUILD_BUILTIN := 784endif 785 786# If we have "make <whatever> modules", compile modules 787# in addition to whatever we do anyway. 788# Just "make" or "make all" shall build modules as well 789 790ifneq ($(filter all modules nsdeps compile_commands.json clang-%,$(MAKECMDGOALS)),) 791 KBUILD_MODULES := y 792endif 793 794ifeq ($(MAKECMDGOALS),) 795 KBUILD_MODULES := y 796endif 797 798export KBUILD_MODULES KBUILD_BUILTIN 799 800ifdef need-config 801include $(objtree)/include/config/auto.conf 802endif 803 804CC_FLAGS_DIALECT := -std=gnu11 805# Allow including a tagged struct or union anonymously in another struct/union. 806CC_FLAGS_DIALECT += $(CONFIG_CC_MS_EXTENSIONS) 807# Clang enables warnings about GNU and Microsoft extensions by default, disable 808# them because this is expected with the above options. 809ifdef CONFIG_CC_IS_CLANG 810CC_FLAGS_DIALECT += -Wno-gnu 811CC_FLAGS_DIALECT += -Wno-microsoft-anon-tag 812endif 813export CC_FLAGS_DIALECT 814KBUILD_CFLAGS += $(CC_FLAGS_DIALECT) 815 816ifeq ($(KBUILD_EXTMOD),) 817# Objects we will link into vmlinux / subdirs we need to visit 818core-y := 819drivers-y := 820libs-y := lib/ 821endif # KBUILD_EXTMOD 822 823# The all: target is the default when no target is given on the 824# command line. 825# This allow a user to issue only 'make' to build a kernel including modules 826# Defaults to vmlinux, but the arch makefile usually adds further targets 827all: vmlinux 828 829# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 830ifdef CONFIG_FUNCTION_TRACER 831 CC_FLAGS_FTRACE := -pg 832endif 833 834ifdef CONFIG_TRACEPOINTS 835# To check for unused tracepoints (tracepoints that are defined but never 836# called), run with: 837# 838# make UT=1 839# 840# Each unused tracepoints can take up to 5KB of memory in the running kernel. 841# It is best to remove any that are not used. 842# 843# This command line option will be removed when all current unused 844# tracepoints are removed. 845 846ifeq ("$(origin UT)", "command line") 847 WARN_ON_UNUSED_TRACEPOINTS := $(UT) 848endif 849endif # CONFIG_TRACEPOINTS 850 851export WARN_ON_UNUSED_TRACEPOINTS 852 853# Per-version Rust flags. These are like `rust_common_flags`, but may 854# depend on the Rust compiler version (e.g. using `rustc-min-version`). 855# 856# `-Aclippy::precedence`: the lint was extended in Rust 1.85.0 to 857# include bitmasking and shift operations. However, because it generated 858# many hits, in Rust 1.86.0 it was split into a new `precedence_bits` 859# lint which is not enabled by default. 860rust_common_flags_per_version := \ 861 $(if $(call rustc-min-version,108600),,-Aclippy::precedence) 862 863rust_common_flags += $(rust_common_flags_per_version) 864KBUILD_HOSTRUSTFLAGS += $(rust_common_flags_per_version) $(HOSTRUSTFLAGS) 865KBUILD_RUSTFLAGS += $(rust_common_flags_per_version) 866 867include $(srctree)/arch/$(SRCARCH)/Makefile 868 869ifdef need-config 870ifdef may-sync-config 871# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 872# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 873# because some architectures define CROSS_COMPILE there. 874include include/config/auto.conf.cmd 875 876$(KCONFIG_CONFIG): 877 @echo >&2 '***' 878 @echo >&2 '*** Configuration file "$@" not found!' 879 @echo >&2 '***' 880 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 881 @echo >&2 '*** "make menuconfig" or "make xconfig").' 882 @echo >&2 '***' 883 @/bin/false 884 885# The actual configuration files used during the build are stored in 886# include/generated/ and include/config/. Update them if .config is newer than 887# include/config/auto.conf (which mirrors .config). 888# 889# This exploits the 'multi-target pattern rule' trick. 890# The syncconfig should be executed only once to make all the targets. 891# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 892# 893# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 894# so you cannot notice that Kconfig is waiting for the user input. 895%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 896 $(Q)$(kecho) " SYNC $@" 897 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 898else # !may-sync-config 899# External modules and some install targets need include/generated/autoconf.h 900# and include/config/auto.conf but do not care if they are up-to-date. 901# Use auto.conf to show the error message 902 903checked-configs := $(addprefix $(objtree)/, include/generated/autoconf.h include/generated/rustc_cfg include/config/auto.conf) 904missing-configs := $(filter-out $(wildcard $(checked-configs)), $(checked-configs)) 905 906ifdef missing-configs 907PHONY += $(objtree)/include/config/auto.conf 908 909$(objtree)/include/config/auto.conf: 910 @echo >&2 '***' 911 @echo >&2 '*** ERROR: Kernel configuration is invalid. The following files are missing:' 912 @printf >&2 '*** - %s\n' $(missing-configs) 913 @echo >&2 '*** Run "make oldconfig && make prepare" on kernel source to fix it.' 914 @echo >&2 '***' 915 @/bin/false 916endif 917 918endif # may-sync-config 919endif # need-config 920 921KBUILD_CFLAGS += -fno-delete-null-pointer-checks 922 923ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 924KBUILD_CFLAGS += -O2 925KBUILD_RUSTFLAGS += -Copt-level=2 926else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 927KBUILD_CFLAGS += -Os 928KBUILD_RUSTFLAGS += -Copt-level=s 929endif 930 931# Always set `debug-assertions` and `overflow-checks` because their default 932# depends on `opt-level` and `debug-assertions`, respectively. 933KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 934KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 935 936# Tell gcc to never replace conditional load with a non-conditional one 937ifdef CONFIG_CC_IS_GCC 938# gcc-10 renamed --param=allow-store-data-races=0 to 939# -fno-allow-store-data-races. 940KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 941KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 942endif 943 944ifdef CONFIG_READABLE_ASM 945# Disable optimizations that make assembler listings hard to read. 946# reorder blocks reorders the control in the function 947# ipa clone creates specialized cloned functions 948# partial inlining inlines only parts of functions 949KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 950endif 951 952stackp-flags-y := -fno-stack-protector 953stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 954stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 955 956KBUILD_CFLAGS += $(stackp-flags-y) 957 958ifdef CONFIG_FRAME_POINTER 959KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 960KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 961else 962# Some targets (ARM with Thumb2, for example), can't be built with frame 963# pointers. For those, we don't have FUNCTION_TRACER automatically 964# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 965# incompatible with -fomit-frame-pointer with current GCC, so we don't use 966# -fomit-frame-pointer with FUNCTION_TRACER. 967# In the Rust target specification, "frame-pointer" is set explicitly 968# to "may-omit". 969ifndef CONFIG_FUNCTION_TRACER 970KBUILD_CFLAGS += -fomit-frame-pointer 971endif 972endif 973 974# Initialize all stack variables with a 0xAA pattern. 975ifdef CONFIG_INIT_STACK_ALL_PATTERN 976KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 977endif 978 979# Initialize all stack variables with a zero value. 980ifdef CONFIG_INIT_STACK_ALL_ZERO 981KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 982ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 983# https://github.com/llvm/llvm-project/issues/44842 984CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 985export CC_AUTO_VAR_INIT_ZERO_ENABLER 986KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 987endif 988endif 989 990ifdef CONFIG_CC_IS_CLANG 991ifdef CONFIG_CC_HAS_COUNTED_BY_PTR 992KBUILD_CFLAGS += -fexperimental-late-parse-attributes 993endif 994endif 995 996# Explicitly clear padding bits during variable initialization 997KBUILD_CFLAGS += $(call cc-option,-fzero-init-padding-bits=all) 998 999# While VLAs have been removed, GCC produces unreachable stack probes 1000# for the randomize_kstack_offset feature. Disable it for all compilers. 1001KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 1002 1003# Get details on warnings generated due to GCC value tracking. 1004KBUILD_CFLAGS += $(call cc-option, -fdiagnostics-show-context=2) 1005 1006# Show inlining notes for __attribute__((warning/error)) call chains. 1007# GCC supports this unconditionally while Clang 23+ provides a flag. 1008KBUILD_CFLAGS += $(call cc-option, -fdiagnostics-show-inlining-chain) 1009 1010# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 1011ifdef CONFIG_ZERO_CALL_USED_REGS 1012KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 1013endif 1014 1015ifdef CONFIG_FUNCTION_TRACER 1016ifdef CONFIG_FTRACE_MCOUNT_USE_CC 1017 CC_FLAGS_FTRACE += -mrecord-mcount 1018 ifdef CONFIG_HAVE_NOP_MCOUNT 1019 ifeq ($(call cc-option-yn, -mnop-mcount),y) 1020 CC_FLAGS_FTRACE += -mnop-mcount 1021 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 1022 endif 1023 endif 1024endif 1025ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 1026 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 1027 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 1028 endif 1029endif 1030ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 1031 ifdef CONFIG_HAVE_C_RECORDMCOUNT 1032 BUILD_C_RECORDMCOUNT := y 1033 export BUILD_C_RECORDMCOUNT 1034 endif 1035endif 1036ifdef CONFIG_HAVE_FENTRY 1037 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 1038 ifeq ($(call cc-option-yn, -mfentry),y) 1039 CC_FLAGS_FTRACE += -mfentry 1040 CC_FLAGS_USING += -DCC_USING_FENTRY 1041 endif 1042endif 1043export CC_FLAGS_FTRACE 1044KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 1045KBUILD_AFLAGS += $(CC_FLAGS_USING) 1046endif 1047 1048# We trigger additional mismatches with less inlining 1049ifdef CONFIG_DEBUG_SECTION_MISMATCH 1050KBUILD_CFLAGS += -fno-inline-functions-called-once 1051endif 1052 1053# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 1054ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 1055KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 1056KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 1057LDFLAGS_vmlinux += --gc-sections 1058endif 1059 1060ifdef CONFIG_SHADOW_CALL_STACK 1061ifndef CONFIG_DYNAMIC_SCS 1062CC_FLAGS_SCS := -fsanitize=shadow-call-stack 1063KBUILD_CFLAGS += $(CC_FLAGS_SCS) 1064KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack 1065endif 1066export CC_FLAGS_SCS 1067endif 1068 1069ifdef CONFIG_LTO_CLANG 1070ifdef CONFIG_LTO_CLANG_THIN 1071CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 1072KBUILD_LDFLAGS += $(call ld-option,--lto-whole-program-visibility -mllvm -always-rename-promoted-locals=false) 1073else 1074CC_FLAGS_LTO := -flto 1075endif 1076CC_FLAGS_LTO += -fvisibility=hidden 1077 1078# Limit inlining across translation units to reduce binary size 1079KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 1080endif 1081 1082ifdef CONFIG_LTO 1083KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 1084KBUILD_AFLAGS += -fno-lto 1085export CC_FLAGS_LTO 1086endif 1087 1088ifdef CONFIG_CFI 1089CC_FLAGS_CFI := -fsanitize=kcfi 1090ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS 1091 CC_FLAGS_CFI += -fsanitize-cfi-icall-experimental-normalize-integers 1092endif 1093ifdef CONFIG_FINEIBT_BHI 1094 CC_FLAGS_CFI += -fsanitize-kcfi-arity 1095endif 1096ifdef CONFIG_RUST 1097 # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects 1098 # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS. 1099 RUSTC_FLAGS_CFI := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers 1100 KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI) 1101 export RUSTC_FLAGS_CFI 1102endif 1103KBUILD_CFLAGS += $(CC_FLAGS_CFI) 1104export CC_FLAGS_CFI 1105endif 1106 1107# Architectures can define flags to add/remove for floating-point support 1108CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT 1109export CC_FLAGS_FPU 1110export CC_FLAGS_NO_FPU 1111 1112ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 1113# Set the minimal function alignment. Use the newer GCC option 1114# -fmin-function-alignment if it is available, or fall back to -falign-funtions. 1115# See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. 1116ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT 1117KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) 1118else 1119KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 1120endif 1121endif 1122 1123# arch Makefile may override CC so keep this after arch Makefile is included 1124NOSTDINC_FLAGS += -nostdinc 1125 1126# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 1127# the kernel uses only C99 flexible arrays for dynamically sized trailing 1128# arrays. Enforce this for everything that may examine structure sizes and 1129# perform bounds checking. 1130KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 1131 1132# disable invalid "can't wrap" optimizations for signed / pointers 1133KBUILD_CFLAGS += -fno-strict-overflow 1134 1135# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1136KBUILD_CFLAGS += -fno-stack-check 1137 1138# conserve stack if available 1139ifdef CONFIG_CC_IS_GCC 1140KBUILD_CFLAGS += -fconserve-stack 1141endif 1142 1143# Ensure compilers do not transform certain loops into calls to wcslen() 1144KBUILD_CFLAGS += -fno-builtin-wcslen 1145 1146CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 1147ifdef CONFIG_CC_IS_GCC 1148CFLAGS_GCOV += -fno-tree-loop-im 1149# Use atomic counter updates to avoid concurrent-access crashes in GCOV. 1150# Only enable if -fprofile-update=prefer-atomic does not introduce new 1151# undefined symbols (e.g. libatomic calls that the kernel cannot link). 1152CFLAGS_GCOV += $(call try-run,\ 1153 echo 'long long x; void f(void){x++;}' | \ 1154 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -w -fprofile-arcs \ 1155 -ftest-coverage -x c - -c -o "$$TMP.base" && \ 1156 echo 'long long x; void f(void){x++;}' | \ 1157 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -w -fprofile-arcs \ 1158 -ftest-coverage -fprofile-update=prefer-atomic \ 1159 -x c - -c -o "$$TMP" && \ 1160 $(NM) "$$TMP.base" | grep ' U ' > "$$TMP.ubase" || true ; \ 1161 $(NM) "$$TMP" | grep ' U ' > "$$TMP.utest" || true ; \ 1162 cmp -s "$$TMP.ubase" "$$TMP.utest",\ 1163 -fprofile-update=prefer-atomic) 1164endif 1165export CFLAGS_GCOV 1166 1167# change __FILE__ to the relative path to the source directory 1168ifdef building_out_of_srctree 1169KBUILD_CPPFLAGS += -fmacro-prefix-map=$(srcroot)/= 1170ifeq ($(call rustc-option-yn, --remap-path-scope=macro),y) 1171KBUILD_RUSTFLAGS += --remap-path-prefix=$(srcroot)/= --remap-path-scope=macro 1172endif 1173endif 1174 1175# include additional Makefiles when needed 1176include-y := scripts/Makefile.warn 1177include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1178include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1179include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1180include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1181include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1182include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1183include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1184include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1185include-$(CONFIG_KSTACK_ERASE) += scripts/Makefile.kstack_erase 1186include-$(CONFIG_AUTOFDO_CLANG) += scripts/Makefile.autofdo 1187include-$(CONFIG_PROPELLER_CLANG) += scripts/Makefile.propeller 1188include-$(CONFIG_WARN_CONTEXT_ANALYSIS) += scripts/Makefile.context-analysis 1189include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1190 1191include $(addprefix $(srctree)/, $(include-y)) 1192 1193# scripts/Makefile.gcc-plugins is intentionally included last. 1194# Do not add $(call cc-option,...) below this line. When you build the kernel 1195# from the clean source tree, the GCC plugins do not exist at this point. 1196 1197# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1198KBUILD_CPPFLAGS += $(KCPPFLAGS) 1199KBUILD_AFLAGS += $(KAFLAGS) 1200KBUILD_CFLAGS += $(KCFLAGS) 1201KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1202 1203KBUILD_LDFLAGS_MODULE += --build-id=sha1 1204LDFLAGS_vmlinux += --build-id=sha1 1205 1206KBUILD_LDFLAGS += -z noexecstack 1207ifeq ($(CONFIG_LD_IS_BFD),y) 1208KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1209endif 1210 1211ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1212LDFLAGS_vmlinux += -X 1213endif 1214 1215ifeq ($(CONFIG_RELR),y) 1216# ld.lld before 15 did not support -z pack-relative-relocs. 1217LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1218endif 1219 1220# We never want expected sections to be placed heuristically by the 1221# linker. All sections should be explicitly named in the linker script. 1222ifdef CONFIG_LD_ORPHAN_WARN 1223LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1224endif 1225 1226ifneq ($(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS),) 1227LDFLAGS_vmlinux += --emit-relocs --discard-none 1228endif 1229 1230# Align the architecture of userspace programs with the kernel 1231USERFLAGS_FROM_KERNEL := --target=% 1232 1233ifdef CONFIG_ARCH_USERFLAGS 1234KBUILD_USERCFLAGS += $(CONFIG_ARCH_USERFLAGS) 1235KBUILD_USERLDFLAGS += $(CONFIG_ARCH_USERFLAGS) 1236else 1237# If not overridden also inherit the bit size 1238USERFLAGS_FROM_KERNEL += -m32 -m64 1239endif 1240 1241KBUILD_USERCFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1242KBUILD_USERLDFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1243 1244# userspace programs are linked via the compiler, use the correct linker 1245ifdef CONFIG_CC_IS_CLANG 1246KBUILD_USERLDFLAGS += --ld-path=$(LD) 1247endif 1248 1249# make the checker run with the right architecture 1250CHECKFLAGS += --arch=$(ARCH) 1251 1252# insure the checker run with the right endianness 1253CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1254 1255# the checker needs the correct machine size 1256CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1257 1258# Validate the checker is available and functional 1259ifneq ($(KBUILD_CHECKSRC), 0) 1260 ifneq ($(shell $(srctree)/scripts/checker-valid.sh $(CHECK) $(CHECKFLAGS)), 1) 1261 $(warning C=$(KBUILD_CHECKSRC) specified, but $(CHECK) is not available or not up to date) 1262 KBUILD_CHECKSRC = 0 1263 endif 1264endif 1265 1266# Default kernel image to build when no specific target is given. 1267# KBUILD_IMAGE may be overruled on the command line or 1268# set in the environment 1269# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1270# this default value 1271export KBUILD_IMAGE ?= vmlinux 1272 1273# 1274# INSTALL_PATH specifies where to place the updated kernel and system map 1275# images. Default is /boot, but you can set it to other values 1276export INSTALL_PATH ?= /boot 1277 1278# 1279# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1280# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1281# an argument if needed. Otherwise it defaults to the kernel install path 1282# 1283export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1284 1285# 1286# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1287# relocations required by build roots. This is not defined in the 1288# makefile but the argument can be passed to make if needed. 1289# 1290 1291MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1292export MODLIB 1293 1294PHONY += prepare0 1295 1296ifeq ($(KBUILD_EXTMOD),) 1297 1298build-dir := . 1299clean-dirs := $(sort . Documentation \ 1300 $(patsubst %/,%,$(filter %/, $(core-) \ 1301 $(drivers-) $(libs-)))) 1302 1303export ARCH_CORE := $(core-y) 1304export ARCH_LIB := $(filter %/, $(libs-y)) 1305export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1306# Externally visible symbols (used by link-vmlinux.sh) 1307 1308KBUILD_VMLINUX_OBJS := built-in.a $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1309KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1310 1311export KBUILD_VMLINUX_LIBS 1312export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1313 1314ifdef CONFIG_TRIM_UNUSED_KSYMS 1315# For the kernel to actually contain only the needed exported symbols, 1316# we have to build modules as well to determine what those symbols are. 1317KBUILD_MODULES := y 1318endif 1319 1320# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1321quiet_cmd_ar_vmlinux.a = AR $@ 1322 cmd_ar_vmlinux.a = \ 1323 rm -f $@; \ 1324 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1325 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1326 1327targets += vmlinux.a 1328vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1329 $(call if_changed,ar_vmlinux.a) 1330 1331PHONY += vmlinux_o 1332vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1333 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1334 1335vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1336 @: 1337 1338PHONY += vmlinux 1339# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1340# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1341# unrelated; the decompressors just happen to have the same base name, 1342# arch/*/boot/compressed/vmlinux. 1343# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1344# 1345# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1346# https://savannah.gnu.org/bugs/?61463 1347# For Make > 4.4, the following simple code will work: 1348# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1349vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1350vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1351vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1352 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1353 1354# The actual objects are generated when descending, 1355# make sure no implicit rule kicks in 1356$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1357 1358ifeq ($(origin KERNELRELEASE),file) 1359filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1360else 1361filechk_kernel.release = echo $(KERNELRELEASE) 1362endif 1363 1364# Store (new) KERNELRELEASE string in include/config/kernel.release 1365include/config/kernel.release: FORCE 1366 $(call filechk,kernel.release) 1367 1368# Additional helpers built in scripts/ 1369# Carefully list dependencies so we do not try to build scripts twice 1370# in parallel 1371PHONY += scripts 1372scripts: scripts_basic scripts_dtc 1373 $(Q)$(MAKE) $(build)=$(@) 1374 1375# Things we need to do before we recursively start building the kernel 1376# or the modules are listed in "prepare". 1377# A multi level approach is used. prepareN is processed before prepareN-1. 1378# archprepare is used in arch Makefiles and when processed asm symlink, 1379# version.h and scripts_basic is processed / created. 1380 1381PHONY += prepare archprepare 1382 1383archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1384 asm-generic $(version_h) include/generated/utsrelease.h \ 1385 include/generated/compile.h include/generated/autoconf.h \ 1386 include/generated/rustc_cfg remove-stale-files 1387 1388prepare0: archprepare 1389 $(Q)$(MAKE) $(build)=scripts/mod 1390 $(Q)$(MAKE) $(build)=. prepare 1391 1392# All the preparing.. 1393prepare: prepare0 1394ifdef CONFIG_RUST 1395 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1396 $(Q)$(MAKE) $(build)=rust 1397endif 1398 1399PHONY += remove-stale-files 1400remove-stale-files: 1401 $(Q)$(srctree)/scripts/remove-stale-files 1402 1403# Support for using generic headers in asm-generic 1404asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj 1405 1406PHONY += asm-generic uapi-asm-generic 1407asm-generic: uapi-asm-generic 1408 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1409 generic=include/asm-generic 1410uapi-asm-generic: 1411 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1412 generic=include/uapi/asm-generic 1413 1414# Generate some files 1415# --------------------------------------------------------------------------- 1416 1417# KERNELRELEASE can change from a few different places, meaning version.h 1418# needs to be updated, so this check is forced on all builds 1419 1420uts_len := 64 1421define filechk_utsrelease.h 1422 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1423 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1424 exit 1; \ 1425 fi; \ 1426 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1427endef 1428 1429define filechk_version.h 1430 if [ $(SUBLEVEL) -gt 255 ]; then \ 1431 echo \#define LINUX_VERSION_CODE $(shell \ 1432 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1433 else \ 1434 echo \#define LINUX_VERSION_CODE $(shell \ 1435 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1436 fi; \ 1437 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1438 ((c) > 255 ? 255 : (c)))'; \ 1439 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1440 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1441 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1442endef 1443 1444$(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1445$(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0) 1446$(version_h): FORCE 1447 $(call filechk,version.h) 1448 1449include/generated/utsrelease.h: include/config/kernel.release FORCE 1450 $(call filechk,utsrelease.h) 1451 1452filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1453 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1454 1455include/generated/compile.h: FORCE 1456 $(call filechk,compile.h) 1457 1458PHONY += headerdep 1459headerdep: 1460 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1461 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1462 1463# --------------------------------------------------------------------------- 1464# Kernel headers 1465 1466#Default location for installed headers 1467export INSTALL_HDR_PATH = $(objtree)/usr 1468 1469quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1470 cmd_headers_install = \ 1471 mkdir -p $(INSTALL_HDR_PATH); \ 1472 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1473 usr/include $(INSTALL_HDR_PATH) 1474 1475PHONY += headers_install 1476headers_install: headers 1477 $(call cmd,headers_install) 1478 1479PHONY += archheaders archscripts 1480 1481hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1482 1483PHONY += headers 1484headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders 1485ifdef HEADER_ARCH 1486 $(Q)$(MAKE) -f $(srctree)/Makefile HEADER_ARCH= SRCARCH=$(HEADER_ARCH) headers 1487else 1488 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1489 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1490endif 1491 1492ifdef CONFIG_HEADERS_INSTALL 1493prepare: headers 1494endif 1495 1496PHONY += usr_gen_init_cpio 1497usr_gen_init_cpio: scripts_basic 1498 $(Q)$(MAKE) $(build)=usr usr/gen_init_cpio 1499 1500PHONY += scripts_unifdef 1501scripts_unifdef: scripts_basic 1502 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1503 1504PHONY += scripts_gen_packed_field_checks 1505scripts_gen_packed_field_checks: scripts_basic 1506 $(Q)$(MAKE) $(build)=scripts scripts/gen_packed_field_checks 1507 1508# --------------------------------------------------------------------------- 1509# Install 1510 1511# Many distributions have the custom install script, /sbin/installkernel. 1512# If DKMS is installed, 'make install' will eventually recurse back 1513# to this Makefile to build and install external modules. 1514# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1515 1516quiet_cmd_install = INSTALL $(INSTALL_PATH) 1517 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1518 1519# --------------------------------------------------------------------------- 1520# vDSO install 1521 1522PHONY += vdso_install 1523vdso_install: export INSTALL_FILES = $(vdso-install-y) 1524vdso_install: 1525 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1526 1527# --------------------------------------------------------------------------- 1528# Tools 1529 1530ifdef CONFIG_OBJTOOL 1531prepare: tools/objtool 1532endif 1533 1534ifdef CONFIG_BPF 1535ifdef CONFIG_DEBUG_INFO_BTF 1536prepare: tools/bpf/resolve_btfids 1537endif 1538endif 1539 1540# The tools build system is not a part of Kbuild and tends to introduce 1541# its own unique issues. If you need to integrate a new tool into Kbuild, 1542# please consider locating that tool outside the tools/ tree and using the 1543# standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry 1544# here. See Documentation/kbuild/makefiles.rst for details. 1545 1546PHONY += resolve_btfids_clean 1547 1548resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1549 1550# tools/bpf/resolve_btfids directory might not exist 1551# in output directory, skip its clean in that case 1552resolve_btfids_clean: 1553ifneq ($(wildcard $(resolve_btfids_O)),) 1554 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1555endif 1556 1557PHONY += objtool_clean objtool_mrproper 1558 1559objtool_O = $(abspath $(objtree))/tools/objtool 1560 1561objtool_clean objtool_mrproper: 1562ifneq ($(wildcard $(objtool_O)),) 1563 $(Q)$(MAKE) -sC $(abs_srctree)/tools/objtool O=$(objtool_O) srctree=$(abs_srctree) $(patsubst objtool_%,%,$@) 1564endif 1565 1566tools/: FORCE 1567 $(Q)mkdir -p $(objtree)/tools 1568 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1569 1570tools/%: FORCE 1571 $(Q)mkdir -p $(objtree)/tools 1572 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1573 1574# --------------------------------------------------------------------------- 1575# Kernel selftest 1576 1577PHONY += kselftest 1578kselftest: headers 1579 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1580 1581kselftest-%: headers FORCE 1582 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1583 1584PHONY += kselftest-merge 1585kselftest-merge: 1586 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1587 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1588 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1589 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1590 1591# --------------------------------------------------------------------------- 1592# Devicetree files 1593 1594ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1595dtstree := arch/$(SRCARCH)/boot/dts 1596endif 1597 1598dtbindingtree := Documentation/devicetree/bindings 1599 1600%.yaml: dtbs_prepare 1601 $(Q)$(MAKE) $(build)=$(dtbindingtree) \ 1602 $(dtbindingtree)/$(patsubst %.yaml,%.example.dtb,$@) dt_binding_check_one 1603 1604ifneq ($(dtstree),) 1605 1606%.dtb: dtbs_prepare 1607 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1608 1609%.dtbo: dtbs_prepare 1610 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1611 1612PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1613dtbs: dtbs_prepare 1614 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1 1615 1616# include/config/kernel.release is actually needed when installing DTBs because 1617# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1618# dtbs_install depend on it as dtbs_install may run as root. 1619dtbs_prepare: include/config/kernel.release scripts_dtc 1620 1621ifneq ($(filter dtbs_check %.yaml, $(MAKECMDGOALS)),) 1622export CHECK_DTBS=y 1623endif 1624 1625ifneq ($(CHECK_DTBS),) 1626dtbs_prepare: dt_binding_schemas 1627endif 1628 1629dtbs_check: dtbs 1630 1631dtbs_install: 1632 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) 1633 1634ifdef CONFIG_OF_EARLY_FLATTREE 1635all: dtbs 1636endif 1637 1638ifdef CONFIG_GENERIC_BUILTIN_DTB 1639vmlinux: dtbs 1640endif 1641 1642endif 1643 1644PHONY += scripts_dtc 1645scripts_dtc: scripts_basic 1646 $(Q)$(MAKE) $(build)=scripts/dtc 1647 1648ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1649export CHECK_DTBS=y 1650endif 1651 1652PHONY += dt_binding_check dt_binding_schemas 1653dt_binding_check: dt_binding_schemas scripts_dtc 1654 $(Q)$(MAKE) $(build)=$(dtbindingtree) $@ 1655 1656dt_binding_schemas: 1657 $(Q)$(MAKE) $(build)=$(dtbindingtree) 1658 1659PHONY += dt_compatible_check 1660dt_compatible_check: dt_binding_schemas 1661 $(Q)$(MAKE) $(build)=$(dtbindingtree) $@ 1662 1663# --------------------------------------------------------------------------- 1664# Modules 1665 1666ifdef CONFIG_MODULES 1667 1668# By default, build modules as well 1669 1670all: modules 1671 1672# When we're building modules with modversions, we need to consider 1673# the built-in objects during the descend as well, in order to 1674# make sure the checksums are up to date before we record them. 1675ifdef CONFIG_MODVERSIONS 1676 KBUILD_BUILTIN := y 1677endif 1678 1679# Build modules 1680# 1681 1682# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1683# is an exception. 1684ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1685KBUILD_BUILTIN := y 1686modules: vmlinux 1687endif 1688 1689modules: modules_prepare 1690 1691# Target to prepare building external modules 1692modules_prepare: prepare 1693 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1694 1695endif # CONFIG_MODULES 1696 1697### 1698# Cleaning is done on three levels. 1699# make clean Delete most generated files 1700# Leave enough to build external modules 1701# make mrproper Delete the current configuration, and all generated files 1702# make distclean Remove editor backup files, patch leftover files and the like 1703 1704# Directories & files removed with 'make clean' 1705CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1706 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1707 modules.builtin.ranges vmlinux.o.map vmlinux.unstripped \ 1708 compile_commands.json rust/test \ 1709 rust-project.json .vmlinux.objs .vmlinux.export.c \ 1710 .builtin-dtbs-list .builtin-dtbs.S 1711 1712# Directories & files removed with 'make mrproper' 1713MRPROPER_FILES += include/config include/generated \ 1714 arch/$(SRCARCH)/include/generated .objdiff \ 1715 debian snap tar-install PKGBUILD pacman \ 1716 .config .config.old .version \ 1717 Module.symvers \ 1718 certs/signing_key.pem \ 1719 certs/x509.genkey \ 1720 vmlinux-gdb.py \ 1721 rpmbuild \ 1722 rust/libmacros.so rust/libmacros.dylib \ 1723 rust/libpin_init_internal.so rust/libpin_init_internal.dylib 1724 1725# clean - Delete most, but leave enough to build external modules 1726# 1727clean: private rm-files := $(CLEAN_FILES) 1728 1729PHONY += archclean vmlinuxclean 1730 1731vmlinuxclean: 1732 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1733 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1734 1735clean: archclean vmlinuxclean resolve_btfids_clean objtool_clean 1736 1737# mrproper - Delete all generated files, including .config 1738# 1739mrproper: private rm-files := $(MRPROPER_FILES) 1740mrproper-dirs := $(addprefix _mrproper_,scripts) 1741 1742PHONY += $(mrproper-dirs) mrproper 1743$(mrproper-dirs): 1744 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1745 1746mrproper: clean objtool_mrproper $(mrproper-dirs) 1747 $(call cmd,rmfiles) 1748 @find . $(RCS_FIND_IGNORE) \ 1749 \( -name '*.rmeta' \) \ 1750 -type f -print | xargs rm -f 1751 1752# distclean 1753# 1754PHONY += distclean 1755 1756distclean: mrproper 1757 @find . $(RCS_FIND_IGNORE) \ 1758 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1759 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1760 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1761 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1762 -type f -print | xargs rm -f 1763 1764 1765# Packaging of the kernel to various formats 1766# --------------------------------------------------------------------------- 1767 1768modules-cpio-pkg: usr_gen_init_cpio 1769 1770%src-pkg: FORCE 1771 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1772%pkg: include/config/kernel.release FORCE 1773 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1774 1775# Brief documentation of the typical targets used 1776# --------------------------------------------------------------------------- 1777 1778boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1779boards := $(sort $(notdir $(boards))) 1780board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1781board-dirs := $(sort $(notdir $(board-dirs:/=))) 1782 1783PHONY += help 1784help: 1785 @echo 'Cleaning targets:' 1786 @echo ' clean - Remove most generated files but keep the config and' 1787 @echo ' enough build support to build external modules' 1788 @echo ' mrproper - Remove all generated files + config + various backup files' 1789 @echo ' distclean - mrproper + remove editor backup and patch files' 1790 @echo '' 1791 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1792 @echo '' 1793 @echo 'Other generic targets:' 1794 @echo ' all - Build all targets marked with [*]' 1795 @echo '* vmlinux - Build the bare kernel' 1796 @echo '* modules - Build all modules' 1797 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1798 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1799 @echo ' dir/ - Build all files in dir and below' 1800 @echo ' dir/file.[ois] - Build specified target only' 1801 @echo ' dir/file.ll - Build the LLVM assembly file' 1802 @echo ' (requires compiler support for LLVM assembly generation)' 1803 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1804 @echo ' (requires a recent binutils and recent build (System.map))' 1805 @echo ' dir/file.ko - Build module including final link' 1806 @echo ' modules_prepare - Set up for building external modules' 1807 @echo ' tags/TAGS - Generate tags file for editors' 1808 @echo ' cscope - Generate cscope index' 1809 @echo ' gtags - Generate GNU GLOBAL index' 1810 @echo ' kernelrelease - Output the release version string (use with make -s)' 1811 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1812 @echo ' image_name - Output the image name (use with make -s)' 1813 @echo ' headers - Build ready-to-install UAPI headers in usr/include' 1814 @echo ' headers_install - Install sanitised kernel UAPI headers to INSTALL_HDR_PATH'; \ 1815 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1816 echo '' 1817 @echo 'Static analysers:' 1818 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1819 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1820 @echo ' versioncheck - Sanity check on version.h usage' 1821 @echo ' includecheck - Check for duplicate included header files' 1822 @echo ' headerdep - Detect inclusion cycles in headers' 1823 @echo ' coccicheck - Check with Coccinelle' 1824 @echo ' clang-analyzer - Check with clang static analyzer' 1825 @echo ' clang-tidy - Check with clang-tidy' 1826 @echo '' 1827 @echo 'Tools:' 1828 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1829 @echo '' 1830 @echo 'Kernel selftest:' 1831 @echo ' kselftest - Build and run kernel selftest' 1832 @echo ' Build, install, and boot kernel before' 1833 @echo ' running kselftest on it' 1834 @echo ' Run as root for full coverage' 1835 @echo ' kselftest-all - Build kernel selftest' 1836 @echo ' kselftest-install - Build and install kernel selftest' 1837 @echo ' kselftest-clean - Remove all generated kselftest files' 1838 @echo ' kselftest-merge - Merge all the config dependencies of' 1839 @echo ' kselftest to existing .config.' 1840 @echo '' 1841 @echo 'Rust targets:' 1842 @echo ' rustavailable - Checks whether the Rust toolchain is' 1843 @echo ' available and, if not, explains why.' 1844 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1845 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1846 @echo ' is formatted, printing a diff otherwise.' 1847 @echo ' rustdoc - Generate Rust documentation' 1848 @echo ' (requires kernel .config)' 1849 @echo ' rusttest - Runs the Rust tests' 1850 @echo ' (requires kernel .config; downloads external repos)' 1851 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1852 @echo ' (requires kernel .config)' 1853 @echo ' dir/file.[os] - Build specified target only' 1854 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1855 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1856 @echo ' The output is not intended to be compilable.' 1857 @echo ' dir/file.ll - Build the LLVM assembly file' 1858 @echo '' 1859 @$(if $(dtstree), \ 1860 echo 'Devicetree:'; \ 1861 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1862 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1863 echo ' dt_binding_check - Validate device tree binding documents and examples'; \ 1864 echo ' dt_binding_schemas - Build processed device tree binding schemas'; \ 1865 echo ' dtbs_check - Validate device tree source files';\ 1866 echo '') 1867 1868 @echo 'Userspace tools targets:' 1869 @echo ' use "make tools/help"' 1870 @echo ' or "cd tools; make help"' 1871 @echo '' 1872 @echo 'Kernel packaging:' 1873 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1874 @echo '' 1875 @echo 'Documentation targets:' 1876 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1877 @echo '' 1878 @echo 'Architecture-specific targets ($(SRCARCH)):' 1879 @$(or $(archhelp),\ 1880 echo ' No architecture-specific help defined for $(SRCARCH)') 1881 @echo '' 1882 @$(if $(boards), \ 1883 $(foreach b, $(boards), \ 1884 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1885 echo '') 1886 @$(if $(board-dirs), \ 1887 $(foreach b, $(board-dirs), \ 1888 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1889 printf " %-16s - Show all of the above\\n" help-boards; \ 1890 echo '') 1891 1892 @echo ' make V=n [targets] 1: verbose build' 1893 @echo ' 2: give reason for rebuild of target' 1894 @echo ' V=1 and V=2 can be combined with V=12' 1895 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1896 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1897 @echo ' (sparse by default)' 1898 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1899 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1900 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where' 1901 @echo ' 1: warnings which may be relevant and do not occur too often' 1902 @echo ' 2: warnings which occur quite often but may still be relevant' 1903 @echo ' 3: more obscure warnings, can most likely be ignored' 1904 @echo ' c: extra checks in the configuration stage (Kconfig)' 1905 @echo ' e: warnings are being treated as errors' 1906 @echo ' Multiple levels can be combined with W=12 or W=123' 1907 @echo ' make UT=1 [targets] Warn if a tracepoint is defined but not used.' 1908 @echo ' [ This will be removed when all current unused tracepoints are eliminated. ]' 1909 @$(if $(dtstree), \ 1910 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1911 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1912 ) 1913 @echo '' 1914 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1915 @echo 'For further info see the ./README file' 1916 1917 1918help-board-dirs := $(addprefix help-,$(board-dirs)) 1919 1920help-boards: $(help-board-dirs) 1921 1922boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1923 1924$(help-board-dirs): help-%: 1925 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1926 @$(if $(boards-per-dir), \ 1927 $(foreach b, $(boards-per-dir), \ 1928 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1929 echo '') 1930 1931 1932# Documentation targets 1933# --------------------------------------------------------------------------- 1934DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1935 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs mandocs \ 1936 htmldocs-redirects 1937 1938PHONY += $(DOC_TARGETS) 1939$(DOC_TARGETS): 1940 $(Q)$(MAKE) $(build)=Documentation $@ 1941 1942 1943# Rust targets 1944# --------------------------------------------------------------------------- 1945 1946# "Is Rust available?" target 1947PHONY += rustavailable 1948rustavailable: 1949 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1950 1951# Documentation target 1952# 1953# Using the singular to avoid running afoul of `no-dot-config-targets`. 1954PHONY += rustdoc 1955rustdoc: prepare 1956 $(Q)$(MAKE) $(build)=rust $@ 1957 1958# Testing target 1959PHONY += rusttest 1960rusttest: prepare 1961 $(Q)$(MAKE) $(build)=rust $@ 1962 1963# Formatting targets 1964# 1965# Generated files as well as vendored crates are skipped. 1966PHONY += rustfmt rustfmtcheck 1967 1968rustfmt: 1969 $(Q)find $(srctree) $(RCS_FIND_IGNORE) \ 1970 \( \ 1971 -path $(srctree)/rust/proc-macro2 \ 1972 -o -path $(srctree)/rust/quote \ 1973 -o -path $(srctree)/rust/syn \ 1974 \) -prune -o \ 1975 -type f -a -name '*.rs' -a ! -name '*generated*' -print \ 1976 | xargs $(RUSTFMT) $(rustfmt_flags) 1977 1978rustfmtcheck: rustfmt_flags = --check 1979rustfmtcheck: rustfmt 1980 1981# Misc 1982# --------------------------------------------------------------------------- 1983 1984PHONY += misc-check 1985misc-check: 1986 $(Q)$(srctree)/scripts/misc-check 1987 1988all: misc-check 1989 1990PHONY += scripts_gdb 1991scripts_gdb: prepare0 1992 $(Q)$(MAKE) $(build)=scripts/gdb 1993 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1994 1995ifdef CONFIG_GDB_SCRIPTS 1996all: scripts_gdb 1997endif 1998 1999else # KBUILD_EXTMOD 2000 2001filechk_kernel.release = echo $(KERNELRELEASE) 2002 2003### 2004# External module support. 2005# When building external modules the kernel used as basis is considered 2006# read-only, and no consistency checks are made and the make 2007# system is not used on the basis kernel. If updates are required 2008# in the basis kernel ordinary make commands (without M=...) must be used. 2009 2010# We are always building only modules. 2011KBUILD_BUILTIN := 2012KBUILD_MODULES := y 2013 2014build-dir := . 2015 2016clean-dirs := . 2017clean: private rm-files := Module.symvers modules.nsdeps compile_commands.json 2018 2019PHONY += prepare 2020# now expand this into a simple variable to reduce the cost of shell evaluations 2021prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 2022prepare: PAHOLE_VERSION := $(PAHOLE_VERSION) 2023prepare: 2024 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 2025 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 2026 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 2027 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 2028 fi 2029 @if [ "$(PAHOLE_VERSION)" != "$(CONFIG_PAHOLE_VERSION)" ]; then \ 2030 echo >&2 "warning: pahole version differs from the one used to build the kernel"; \ 2031 echo >&2 " The kernel was built with: $(CONFIG_PAHOLE_VERSION)"; \ 2032 echo >&2 " You are using: $(PAHOLE_VERSION)"; \ 2033 fi 2034 2035PHONY += help 2036help: 2037 @echo ' Building external modules.' 2038 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 2039 @echo '' 2040 @echo ' modules - default target, build the module(s)' 2041 @echo ' modules_install - install the module' 2042 @echo ' clean - remove generated files in module directory only' 2043 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 2044 @echo '' 2045 2046ifndef CONFIG_MODULES 2047modules modules_install: __external_modules_error 2048__external_modules_error: 2049 @echo >&2 '***' 2050 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 2051 @echo >&2 '*** You cannot build or install external modules.' 2052 @echo >&2 '***' 2053 @false 2054endif 2055 2056endif # KBUILD_EXTMOD 2057 2058# --------------------------------------------------------------------------- 2059# Modules 2060 2061PHONY += modules modules_install modules_sign modules_prepare 2062 2063modules_install: 2064 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 2065 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 2066 2067ifeq ($(CONFIG_MODULE_SIG),y) 2068# modules_sign is a subset of modules_install. 2069# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 2070modules_sign: modules_install 2071 @: 2072else 2073modules_sign: 2074 @echo >&2 '***' 2075 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 2076 @echo >&2 '***' 2077 @false 2078endif 2079 2080ifdef CONFIG_MODULES 2081 2082modules.order: $(build-dir) 2083 @: 2084 2085# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 2086# This is solely useful to speed up test compiles. 2087modules: modpost 2088ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2089 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2090endif 2091 2092PHONY += modules_check 2093modules_check: modules.order 2094 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 2095 2096else # CONFIG_MODULES 2097 2098modules: 2099 @: 2100 2101KBUILD_MODULES := 2102 2103endif # CONFIG_MODULES 2104 2105PHONY += modpost 2106modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 2107 $(if $(KBUILD_MODULES), modules_check) 2108 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2109 2110# Single targets 2111# --------------------------------------------------------------------------- 2112# To build individual files in subdirectories, you can do like this: 2113# 2114# make foo/bar/baz.s 2115# 2116# The supported suffixes for single-target are listed in 'single-targets' 2117# 2118# To build only under specific subdirectories, you can do like this: 2119# 2120# make foo/bar/baz/ 2121 2122ifdef single-build 2123 2124# .ko is special because modpost is needed 2125single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 2126single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 2127 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 2128 2129$(single-ko): single_modules 2130 @: 2131$(single-no-ko): $(build-dir) 2132 @: 2133 2134# Remove modules.order when done because it is not the real one. 2135PHONY += single_modules 2136single_modules: $(single-no-ko) modules_prepare 2137 $(Q){ $(foreach m, $(single-ko), echo $(m:%.ko=%.o);) } > modules.order 2138 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2139ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2140 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2141endif 2142 $(Q)rm -f modules.order 2143 2144single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 2145 2146KBUILD_MODULES := y 2147 2148endif 2149 2150prepare: outputmakefile 2151 2152# Preset locale variables to speed up the build process. Limit locale 2153# tweaks to this spot to avoid wrong language settings when running 2154# make menuconfig etc. 2155# Error messages still appears in the original language 2156PHONY += $(build-dir) 2157$(build-dir): prepare 2158 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 2159 2160clean-dirs := $(addprefix _clean_, $(clean-dirs)) 2161PHONY += $(clean-dirs) clean 2162$(clean-dirs): 2163 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 2164 2165clean: $(clean-dirs) 2166 $(call cmd,rmfiles) 2167 @find . $(RCS_FIND_IGNORE) \ 2168 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 2169 -o -name '*.ko.*' \ 2170 -o -name '*.dtb' -o -name '*.dtbo' \ 2171 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 2172 -o -name '*.dt.yaml' -o -name 'dtbs-list' \ 2173 -o -name '*.dwo' -o -name '*.lst' \ 2174 -o -name '*.su' -o -name '*.mod' \ 2175 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 2176 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 2177 -o -name '*.asn1.[ch]' \ 2178 -o -name '*.symtypes' -o -name 'modules.order' \ 2179 -o -name '*.c.[012]*.*' \ 2180 -o -name '*.ll' \ 2181 -o -name '*.gcno' \ 2182 \) -type f -print \ 2183 -o -name '.tmp_*' -print \ 2184 | xargs rm -rf 2185 2186# Generate tags for editors 2187# --------------------------------------------------------------------------- 2188quiet_cmd_tags = GEN $@ 2189 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 2190 2191tags TAGS cscope gtags: FORCE 2192 $(call cmd,tags) 2193 2194# Generate rust-project.json (a file that describes the structure of non-Cargo 2195# Rust projects) for rust-analyzer (an implementation of the Language Server 2196# Protocol). 2197PHONY += rust-analyzer 2198rust-analyzer: 2199 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 2200ifdef KBUILD_EXTMOD 2201# FIXME: external modules must not descend into a sub-directory of the kernel 2202 $(Q)$(MAKE) $(build)=$(objtree)/rust src=$(srctree)/rust $@ 2203else 2204 $(Q)$(MAKE) $(build)=rust $@ 2205endif 2206 2207# Script to generate missing namespace dependencies 2208# --------------------------------------------------------------------------- 2209 2210PHONY += nsdeps 2211nsdeps: export KBUILD_NSDEPS=1 2212nsdeps: modules 2213 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 2214 2215# Clang Tooling 2216# --------------------------------------------------------------------------- 2217 2218quiet_cmd_gen_compile_commands = GEN $@ 2219 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2220 2221compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \ 2222 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2223 $(if $(CONFIG_MODULES), modules.order) FORCE 2224 $(call if_changed,gen_compile_commands) 2225 2226targets += compile_commands.json 2227 2228PHONY += clang-tidy clang-analyzer 2229 2230ifdef CONFIG_CC_IS_CLANG 2231quiet_cmd_clang_tools = CHECK $< 2232 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2233 2234clang-tidy clang-analyzer: compile_commands.json 2235 $(call cmd,clang_tools) 2236else 2237clang-tidy clang-analyzer: 2238 @echo "$@ requires CC=clang" >&2 2239 @false 2240endif 2241 2242# Scripts to check various things for consistency 2243# --------------------------------------------------------------------------- 2244 2245PHONY += includecheck versioncheck coccicheck 2246 2247includecheck: 2248 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2249 -name '*.[hcS]' -type f -print | sort \ 2250 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2251 2252versioncheck: 2253 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2254 -name '*.[hcS]' -type f -print | sort \ 2255 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2256 2257coccicheck: 2258 $(Q)$(BASH) $(srctree)/scripts/$@ 2259 2260PHONY += checkstack kernelrelease kernelversion image_name 2261 2262# UML needs a little special treatment here. It wants to use the host 2263# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2264# else wants $(ARCH), including people doing cross-builds, which means 2265# that $(SUBARCH) doesn't work here. 2266ifeq ($(ARCH), um) 2267CHECKSTACK_ARCH := $(SUBARCH) 2268else 2269CHECKSTACK_ARCH := $(ARCH) 2270endif 2271MINSTACKSIZE ?= 100 2272checkstack: 2273 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2274 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2275 2276kernelrelease: 2277 @$(filechk_kernel.release) 2278 2279kernelversion: 2280 @echo $(KERNELVERSION) 2281 2282image_name: 2283 @echo $(KBUILD_IMAGE) 2284 2285PHONY += run-command 2286run-command: 2287 $(Q)$(KBUILD_RUN_COMMAND) 2288 2289quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2290 cmd_rmfiles = rm -rf $(rm-files) 2291 2292# read saved command lines for existing targets 2293existing-targets := $(wildcard $(sort $(targets))) 2294 2295-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2296 2297endif # config-build 2298endif # mixed-build 2299endif # need-sub-make 2300 2301PHONY += FORCE 2302FORCE: 2303 2304# Declare the contents of the PHONY variable as phony. We keep that 2305# information in a variable so we can use it in if_changed and friends. 2306.PHONY: $(PHONY) 2307