1# SPDX-License-Identifier: GPL-2.0 2VERSION = 7 3PATCHLEVEL = 1 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 kconfig-sym-check \ 297 $(version_h) headers headers_% archheaders archscripts \ 298 %asm-generic kernelversion %src-pkg dt_binding_check \ 299 outputmakefile rustavailable rustfmt rustfmtcheck \ 300 run-command 301no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \ 302 image_name 303single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %/ 304 305config-build := 306mixed-build := 307need-config := 1 308may-sync-config := 1 309single-build := 310 311ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 312 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 313 need-config := 314 endif 315endif 316 317ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 318 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 319 may-sync-config := 320 endif 321endif 322 323need-compiler := $(may-sync-config) 324 325ifneq ($(KBUILD_EXTMOD),) 326 may-sync-config := 327endif 328 329ifeq ($(KBUILD_EXTMOD),) 330 ifneq ($(filter %config,$(MAKECMDGOALS)),) 331 config-build := 1 332 ifneq ($(words $(MAKECMDGOALS)),1) 333 mixed-build := 1 334 endif 335 endif 336endif 337 338# We cannot build single targets and the others at the same time 339ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 340 single-build := 1 341 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 342 mixed-build := 1 343 endif 344endif 345 346# For "make -j clean all", "make -j mrproper defconfig all", etc. 347ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 348 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 349 mixed-build := 1 350 endif 351endif 352 353# install and modules_install need also be processed one by one 354ifneq ($(filter install,$(MAKECMDGOALS)),) 355 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 356 mixed-build := 1 357 endif 358endif 359 360ifdef mixed-build 361# =========================================================================== 362# We're called with mixed targets (*config and build targets). 363# Handle them one by one. 364 365PHONY += $(MAKECMDGOALS) __build_one_by_one 366 367$(MAKECMDGOALS): __build_one_by_one 368 @: 369 370__build_one_by_one: 371 $(Q)set -e; \ 372 for i in $(MAKECMDGOALS); do \ 373 $(MAKE) -f $(srctree)/Makefile $$i; \ 374 done 375 376else # !mixed-build 377 378include $(srctree)/scripts/Kbuild.include 379 380# Read KERNELRELEASE from include/config/kernel.release (if it exists) 381KERNELRELEASE = $(call read-file, $(objtree)/include/config/kernel.release) 382KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 383export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 384 385include $(srctree)/scripts/subarch.include 386 387# Cross compiling and selecting different set of gcc/bin-utils 388# --------------------------------------------------------------------------- 389# 390# When performing cross compilation for other architectures ARCH shall be set 391# to the target architecture. (See arch/* for the possibilities). 392# ARCH can be set during invocation of make: 393# make ARCH=arm64 394# Another way is to have ARCH set in the environment. 395# The default ARCH is the host where make is executed. 396 397# CROSS_COMPILE specify the prefix used for all executables used 398# during compilation. Only gcc and related bin-utils executables 399# are prefixed with $(CROSS_COMPILE). 400# CROSS_COMPILE can be set on the command line 401# make CROSS_COMPILE=aarch64-linux-gnu- 402# Alternatively CROSS_COMPILE can be set in the environment. 403# Default value for CROSS_COMPILE is not to prefix executables 404# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 405ARCH ?= $(SUBARCH) 406 407# Architecture as present in compile.h 408UTS_MACHINE := $(ARCH) 409SRCARCH := $(ARCH) 410 411# Additional ARCH settings for x86 412ifeq ($(ARCH),i386) 413 SRCARCH := x86 414endif 415ifeq ($(ARCH),x86_64) 416 SRCARCH := x86 417endif 418 419# Additional ARCH settings for sparc 420ifeq ($(ARCH),sparc32) 421 SRCARCH := sparc 422endif 423ifeq ($(ARCH),sparc64) 424 SRCARCH := sparc 425endif 426 427# Additional ARCH settings for parisc 428ifeq ($(ARCH),parisc64) 429 SRCARCH := parisc 430endif 431 432export cross_compiling := 433ifneq ($(SRCARCH),$(SUBARCH)) 434cross_compiling := 1 435endif 436 437KCONFIG_CONFIG ?= .config 438export KCONFIG_CONFIG 439 440# SHELL used by kbuild 441CONFIG_SHELL := sh 442 443HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 444HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 445HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 446 447ifneq ($(LLVM),) 448ifneq ($(filter %/,$(LLVM)),) 449LLVM_PREFIX := $(LLVM) 450else ifneq ($(filter -%,$(LLVM)),) 451LLVM_SUFFIX := $(LLVM) 452else ifneq ($(LLVM),1) 453$(error Invalid value for LLVM, see Documentation/kbuild/llvm.rst) 454endif 455 456HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 457HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 458else 459HOSTCC = gcc 460HOSTCXX = g++ 461endif 462HOSTRUSTC = rustc 463HOSTPKG_CONFIG = pkg-config 464 465# the KERNELDOC macro needs to be exported, as scripts/Makefile.build 466# has a logic to call it 467KERNELDOC = $(srctree)/tools/docs/kernel-doc 468export KERNELDOC 469 470KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 471 -O2 -fomit-frame-pointer -std=gnu11 472KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 473KBUILD_USERLDFLAGS := $(USERLDFLAGS) 474 475# These flags apply to all Rust code in the tree, including the kernel and 476# host programs. 477export rust_common_flags := --edition=2021 \ 478 -Zbinary_dep_depinfo=y \ 479 -Astable_features \ 480 -Aunused_features \ 481 -Dnon_ascii_idents \ 482 -Dunsafe_op_in_unsafe_fn \ 483 -Wmissing_docs \ 484 -Wrust_2018_idioms \ 485 -Wunreachable_pub \ 486 -Wclippy::all \ 487 -Wclippy::as_ptr_cast_mut \ 488 -Wclippy::as_underscore \ 489 -Wclippy::cast_lossless \ 490 -Aclippy::collapsible_if \ 491 -Aclippy::collapsible_match \ 492 -Wclippy::ignored_unit_patterns \ 493 -Aclippy::incompatible_msrv \ 494 -Wclippy::mut_mut \ 495 -Wclippy::needless_bitwise_bool \ 496 -Aclippy::needless_lifetimes \ 497 -Wclippy::no_mangle_with_rust_abi \ 498 -Wclippy::ptr_as_ptr \ 499 -Wclippy::ptr_cast_constness \ 500 -Wclippy::ref_as_ptr \ 501 -Wclippy::undocumented_unsafe_blocks \ 502 -Aclippy::uninlined_format_args \ 503 -Wclippy::unnecessary_safety_comment \ 504 -Wclippy::unnecessary_safety_doc \ 505 -Wrustdoc::missing_crate_level_docs \ 506 -Wrustdoc::unescaped_backticks 507 508KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \ 509 $(HOSTCFLAGS) -I $(srctree)/scripts/include 510KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \ 511 -I $(srctree)/scripts/include 512KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 513 -Zallow-features= 514KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 515KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 516KBUILD_PROCMACROLDFLAGS := $(or $(PROCMACROLDFLAGS),$(KBUILD_HOSTLDFLAGS)) 517 518# Make variables (CC, etc...) 519CPP = $(CC) -E 520ifneq ($(LLVM),) 521CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 522LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 523AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 524LLVM_LINK = $(LLVM_PREFIX)llvm-link$(LLVM_SUFFIX) 525NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 526OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 527OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 528READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 529STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 530else 531CC = $(CROSS_COMPILE)gcc 532LD = $(CROSS_COMPILE)ld 533AR = $(CROSS_COMPILE)ar 534NM = $(CROSS_COMPILE)nm 535OBJCOPY = $(CROSS_COMPILE)objcopy 536OBJDUMP = $(CROSS_COMPILE)objdump 537READELF = $(CROSS_COMPILE)readelf 538STRIP = $(CROSS_COMPILE)strip 539endif 540RUSTC = rustc 541RUSTDOC = rustdoc 542RUSTFMT = rustfmt 543CLIPPY_DRIVER = clippy-driver 544BINDGEN = bindgen 545PAHOLE = pahole 546RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 547LEX = flex 548YACC = bison 549AWK = awk 550INSTALLKERNEL := installkernel 551PERL = perl 552PYTHON3 = python3 553CHECK = sparse 554BASH = bash 555KGZIP = gzip 556KBZIP2 = bzip2 557KLZOP = lzop 558LZMA = lzma 559LZ4 = lz4 560XZ = xz 561ZSTD = zstd 562TAR = tar 563 564CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 565 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 566NOSTDINC_FLAGS := 567CFLAGS_MODULE = 568RUSTFLAGS_MODULE = 569AFLAGS_MODULE = 570LDFLAGS_MODULE = 571CFLAGS_KERNEL = 572RUSTFLAGS_KERNEL = 573AFLAGS_KERNEL = 574LDFLAGS_vmlinux = 575 576# Use USERINCLUDE when you must reference the UAPI directories only. 577USERINCLUDE := \ 578 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 579 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 580 -I$(srctree)/include/uapi \ 581 -I$(objtree)/include/generated/uapi \ 582 -include $(srctree)/include/linux/compiler-version.h \ 583 -include $(srctree)/include/linux/kconfig.h 584 585# Use LINUXINCLUDE when you must reference the include/ directory. 586# Needed to be compatible with the O= option 587LINUXINCLUDE := \ 588 -I$(srctree)/arch/$(SRCARCH)/include \ 589 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 590 -I$(srctree)/include \ 591 -I$(objtree)/include \ 592 $(USERINCLUDE) 593 594KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 595 596KBUILD_CFLAGS := 597KBUILD_CFLAGS += -fshort-wchar 598KBUILD_CFLAGS += -funsigned-char 599KBUILD_CFLAGS += -fno-common 600KBUILD_CFLAGS += -fno-PIE 601KBUILD_CFLAGS += -fno-strict-aliasing 602 603KBUILD_CPPFLAGS := -D__KERNEL__ 604KBUILD_RUSTFLAGS := $(rust_common_flags) \ 605 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 606 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 607 -Csymbol-mangling-version=v0 \ 608 -Crelocation-model=static \ 609 -Zfunction-sections=n \ 610 -Wclippy::float_arithmetic 611KBUILD_RUSTFLAGS_OPTION_CHKS := 612 613KBUILD_AFLAGS_KERNEL := 614KBUILD_CFLAGS_KERNEL := 615KBUILD_RUSTFLAGS_KERNEL := 616KBUILD_AFLAGS_MODULE := -DMODULE 617KBUILD_CFLAGS_MODULE := -DMODULE 618KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 619KBUILD_LDFLAGS_MODULE := 620KBUILD_LDFLAGS := 621CLANG_FLAGS := 622 623ifeq ($(KBUILD_CLIPPY),1) 624 RUSTC_OR_CLIPPY_QUIET := CLIPPY 625 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 626else 627 RUSTC_OR_CLIPPY_QUIET := RUSTC 628 RUSTC_OR_CLIPPY = $(RUSTC) 629endif 630 631# Allows the usage of unstable features in stable compilers. 632export RUSTC_BOOTSTRAP := 1 633 634# Allows finding `.clippy.toml` in out-of-srctree builds. 635export CLIPPY_CONF_DIR := $(srctree) 636 637export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 638export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN LLVM_LINK 639export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 640export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 641export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 642export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD TAR 643export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS KBUILD_PROCMACROLDFLAGS LDFLAGS_MODULE 644export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 645 646export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 647export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 648export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE KBUILD_RUSTFLAGS_OPTION_CHKS 649export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 650export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 651export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 652 653# Files to ignore in find ... statements 654 655export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 656 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 657 -prune -o 658 659# =========================================================================== 660# Rules shared between *config targets and build targets 661 662# Basic helpers built in scripts/basic/ 663PHONY += scripts_basic 664scripts_basic: KBUILD_HOSTCFLAGS := $(KBUILD_HOSTCFLAGS) 665scripts_basic: KBUILD_HOSTLDFLAGS := $(KBUILD_HOSTLDFLAGS) 666scripts_basic: 667 $(Q)$(MAKE) $(build)=scripts/basic 668 669PHONY += outputmakefile 670ifdef building_out_of_srctree 671# Before starting out-of-tree build, make sure the source tree is clean. 672# outputmakefile generates a Makefile in the output directory, if using a 673# separate output directory. This allows convenient use of make in the 674# output directory. 675# At the same time when output Makefile generated, generate .gitignore to 676# ignore whole output directory 677 678ifdef KBUILD_EXTMOD 679print_env_for_makefile = \ 680 echo "export KBUILD_OUTPUT = $(objtree)"; \ 681 echo "export KBUILD_EXTMOD = $(realpath $(srcroot))" ; \ 682 echo "export KBUILD_EXTMOD_OUTPUT = $(CURDIR)" 683else 684print_env_for_makefile = \ 685 echo "export KBUILD_OUTPUT = $(CURDIR)" 686endif 687 688filechk_makefile = { \ 689 echo "\# Automatically generated by $(abs_srctree)/Makefile: don't edit"; \ 690 $(print_env_for_makefile); \ 691 echo "include $(abs_srctree)/Makefile"; \ 692 } 693 694$(objtree)/Makefile: FORCE 695 $(call filechk,makefile) 696 697# Prevent $(srcroot)/Makefile from inhibiting the rule to run. 698PHONY += $(objtree)/Makefile 699 700outputmakefile: $(objtree)/Makefile 701ifeq ($(KBUILD_EXTMOD),) 702 @if [ -f $(srctree)/.config -o \ 703 -d $(srctree)/include/config -o \ 704 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 705 echo >&2 "***"; \ 706 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 707 echo >&2 "*** in $(abs_srctree)";\ 708 echo >&2 "***"; \ 709 false; \ 710 fi 711else 712 @if [ -f $(srcroot)/modules.order ]; then \ 713 echo >&2 "***"; \ 714 echo >&2 "*** The external module source tree is not clean."; \ 715 echo >&2 "*** Please run 'make -C $(abs_srctree) M=$(realpath $(srcroot)) clean'"; \ 716 echo >&2 "***"; \ 717 false; \ 718 fi 719endif 720 $(Q)ln -fsn $(srcroot) source 721 $(Q)test -e .gitignore || \ 722 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 723endif 724 725# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 726# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 727# CC_VERSION_TEXT, RUSTC_VERSION_TEXT and PAHOLE_VERSION are referenced from 728# Kconfig (so they need export), and from include/config/auto.conf.cmd to 729# detect the version changes between builds. 730CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 731RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null)) 732PAHOLE_VERSION = $(shell $(srctree)/scripts/pahole-version.sh $(PAHOLE)) 733 734ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 735include $(srctree)/scripts/Makefile.clang 736endif 737 738# Include this also for config targets because some architectures need 739# cc-cross-prefix to determine CROSS_COMPILE. 740ifdef need-compiler 741include $(srctree)/scripts/Makefile.compiler 742endif 743 744ifdef config-build 745# =========================================================================== 746# *config targets only - make sure prerequisites are updated, and descend 747# in scripts/kconfig to make the *config target 748 749# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 750# KBUILD_DEFCONFIG may point out an alternative default configuration 751# used for 'make defconfig' 752include $(srctree)/arch/$(SRCARCH)/Makefile 753export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT RUSTC_VERSION_TEXT PAHOLE_VERSION 754 755config: outputmakefile scripts_basic FORCE 756 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 757 758%config: outputmakefile scripts_basic FORCE 759 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 760 761else #!config-build 762# =========================================================================== 763# Build targets only - this includes vmlinux, arch-specific targets, clean 764# targets and others. In general all targets except *config targets. 765 766# If building an external module we do not care about the all: rule 767# but instead __all depend on modules 768PHONY += all 769ifeq ($(KBUILD_EXTMOD),) 770__all: all 771else 772__all: modules 773endif 774 775targets := 776 777# Decide whether to build built-in, modular, or both. 778# Normally, just do built-in. 779 780KBUILD_MODULES := 781KBUILD_BUILTIN := y 782 783# If we have only "make modules", don't compile built-in objects. 784ifeq ($(MAKECMDGOALS),modules) 785 KBUILD_BUILTIN := 786endif 787 788# If we have "make <whatever> modules", compile modules 789# in addition to whatever we do anyway. 790# Just "make" or "make all" shall build modules as well 791 792ifneq ($(filter all modules nsdeps compile_commands.json clang-%,$(MAKECMDGOALS)),) 793 KBUILD_MODULES := y 794endif 795 796ifeq ($(MAKECMDGOALS),) 797 KBUILD_MODULES := y 798endif 799 800export KBUILD_MODULES KBUILD_BUILTIN 801 802ifdef need-config 803include $(objtree)/include/config/auto.conf 804endif 805 806CC_FLAGS_DIALECT := -std=gnu11 807# Allow including a tagged struct or union anonymously in another struct/union. 808CC_FLAGS_DIALECT += $(CONFIG_CC_MS_EXTENSIONS) 809# Clang enables warnings about GNU and Microsoft extensions by default, disable 810# them because this is expected with the above options. 811ifdef CONFIG_CC_IS_CLANG 812CC_FLAGS_DIALECT += -Wno-gnu 813CC_FLAGS_DIALECT += -Wno-microsoft-anon-tag 814endif 815export CC_FLAGS_DIALECT 816KBUILD_CFLAGS += $(CC_FLAGS_DIALECT) 817 818ifeq ($(KBUILD_EXTMOD),) 819# Objects we will link into vmlinux / subdirs we need to visit 820core-y := 821drivers-y := 822libs-y := lib/ 823endif # KBUILD_EXTMOD 824 825# The all: target is the default when no target is given on the 826# command line. 827# This allow a user to issue only 'make' to build a kernel including modules 828# Defaults to vmlinux, but the arch makefile usually adds further targets 829all: vmlinux 830 831CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 832ifdef CONFIG_CC_IS_GCC 833CFLAGS_GCOV += -fno-tree-loop-im 834endif 835export CFLAGS_GCOV 836 837# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 838ifdef CONFIG_FUNCTION_TRACER 839 CC_FLAGS_FTRACE := -pg 840endif 841 842ifdef CONFIG_TRACEPOINTS 843# To check for unused tracepoints (tracepoints that are defined but never 844# called), run with: 845# 846# make UT=1 847# 848# Each unused tracepoints can take up to 5KB of memory in the running kernel. 849# It is best to remove any that are not used. 850# 851# This command line option will be removed when all current unused 852# tracepoints are removed. 853 854ifeq ("$(origin UT)", "command line") 855 WARN_ON_UNUSED_TRACEPOINTS := $(UT) 856endif 857endif # CONFIG_TRACEPOINTS 858 859export WARN_ON_UNUSED_TRACEPOINTS 860 861# Per-version Rust flags. These are like `rust_common_flags`, but may 862# depend on the Rust compiler version (e.g. using `rustc-min-version`). 863# 864# `-Aclippy::precedence`: the lint was extended in Rust 1.85.0 to 865# include bitmasking and shift operations. However, because it generated 866# many hits, in Rust 1.86.0 it was split into a new `precedence_bits` 867# lint which is not enabled by default. 868rust_common_flags_per_version := \ 869 $(if $(call rustc-min-version,108600),,-Aclippy::precedence) 870 871rust_common_flags += $(rust_common_flags_per_version) 872KBUILD_HOSTRUSTFLAGS += $(rust_common_flags_per_version) $(HOSTRUSTFLAGS) 873KBUILD_RUSTFLAGS += $(rust_common_flags_per_version) 874 875include $(srctree)/arch/$(SRCARCH)/Makefile 876 877ifdef need-config 878ifdef may-sync-config 879# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 880# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 881# because some architectures define CROSS_COMPILE there. 882include include/config/auto.conf.cmd 883 884$(KCONFIG_CONFIG): 885 @echo >&2 '***' 886 @echo >&2 '*** Configuration file "$@" not found!' 887 @echo >&2 '***' 888 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 889 @echo >&2 '*** "make menuconfig" or "make xconfig").' 890 @echo >&2 '***' 891 @/bin/false 892 893# The actual configuration files used during the build are stored in 894# include/generated/ and include/config/. Update them if .config is newer than 895# include/config/auto.conf (which mirrors .config). 896# 897# This exploits the 'multi-target pattern rule' trick. 898# The syncconfig should be executed only once to make all the targets. 899# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 900# 901# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 902# so you cannot notice that Kconfig is waiting for the user input. 903%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 904 $(Q)$(kecho) " SYNC $@" 905 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 906else # !may-sync-config 907# External modules and some install targets need include/generated/autoconf.h 908# and include/config/auto.conf but do not care if they are up-to-date. 909# Use auto.conf to show the error message 910 911checked-configs := $(addprefix $(objtree)/, include/generated/autoconf.h include/generated/rustc_cfg include/config/auto.conf) 912missing-configs := $(filter-out $(wildcard $(checked-configs)), $(checked-configs)) 913 914ifdef missing-configs 915PHONY += $(objtree)/include/config/auto.conf 916 917$(objtree)/include/config/auto.conf: 918 @echo >&2 '***' 919 @echo >&2 '*** ERROR: Kernel configuration is invalid. The following files are missing:' 920 @printf >&2 '*** - %s\n' $(missing-configs) 921 @echo >&2 '*** Run "make oldconfig && make prepare" on kernel source to fix it.' 922 @echo >&2 '***' 923 @/bin/false 924endif 925 926endif # may-sync-config 927endif # need-config 928 929KBUILD_CFLAGS += -fno-delete-null-pointer-checks 930 931ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 932KBUILD_CFLAGS += -O2 933KBUILD_RUSTFLAGS += -Copt-level=2 934else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 935KBUILD_CFLAGS += -Os 936KBUILD_RUSTFLAGS += -Copt-level=s 937endif 938 939# Always set `debug-assertions` and `overflow-checks` because their default 940# depends on `opt-level` and `debug-assertions`, respectively. 941KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 942KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 943 944# Tell gcc to never replace conditional load with a non-conditional one 945ifdef CONFIG_CC_IS_GCC 946# gcc-10 renamed --param=allow-store-data-races=0 to 947# -fno-allow-store-data-races. 948KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 949KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 950endif 951 952ifdef CONFIG_READABLE_ASM 953# Disable optimizations that make assembler listings hard to read. 954# reorder blocks reorders the control in the function 955# ipa clone creates specialized cloned functions 956# partial inlining inlines only parts of functions 957KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 958endif 959 960stackp-flags-y := -fno-stack-protector 961stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 962stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 963 964KBUILD_CFLAGS += $(stackp-flags-y) 965 966ifdef CONFIG_FRAME_POINTER 967KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 968KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 969else 970# Some targets (ARM with Thumb2, for example), can't be built with frame 971# pointers. For those, we don't have FUNCTION_TRACER automatically 972# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 973# incompatible with -fomit-frame-pointer with current GCC, so we don't use 974# -fomit-frame-pointer with FUNCTION_TRACER. 975# In the Rust target specification, "frame-pointer" is set explicitly 976# to "may-omit". 977ifndef CONFIG_FUNCTION_TRACER 978KBUILD_CFLAGS += -fomit-frame-pointer 979endif 980endif 981 982# Initialize all stack variables with a 0xAA pattern. 983ifdef CONFIG_INIT_STACK_ALL_PATTERN 984KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 985endif 986 987# Initialize all stack variables with a zero value. 988ifdef CONFIG_INIT_STACK_ALL_ZERO 989KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 990ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 991# https://github.com/llvm/llvm-project/issues/44842 992CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 993export CC_AUTO_VAR_INIT_ZERO_ENABLER 994KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 995endif 996endif 997 998ifdef CONFIG_KMALLOC_PARTITION_TYPED 999# KMALLOC_PARTITION_CACHES_NR + 1 1000KBUILD_CFLAGS += -falloc-token-max=16 1001endif 1002 1003ifdef CONFIG_CC_IS_CLANG 1004ifdef CONFIG_CC_HAS_COUNTED_BY_PTR 1005KBUILD_CFLAGS += -fexperimental-late-parse-attributes 1006endif 1007endif 1008 1009# Explicitly clear padding bits during variable initialization 1010KBUILD_CFLAGS += $(call cc-option,-fzero-init-padding-bits=all) 1011 1012# While VLAs have been removed, GCC produces unreachable stack probes 1013# for the randomize_kstack_offset feature. Disable it for all compilers. 1014KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 1015 1016# Get details on warnings generated due to GCC value tracking. 1017KBUILD_CFLAGS += $(call cc-option, -fdiagnostics-show-context=2) 1018 1019# Show inlining notes for __attribute__((warning/error)) call chains. 1020# GCC supports this unconditionally while Clang 23+ provides a flag. 1021KBUILD_CFLAGS += $(call cc-option, -fdiagnostics-show-inlining-chain) 1022 1023# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 1024ifdef CONFIG_ZERO_CALL_USED_REGS 1025KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 1026endif 1027 1028ifdef CONFIG_FUNCTION_TRACER 1029ifdef CONFIG_FTRACE_MCOUNT_USE_CC 1030 CC_FLAGS_FTRACE += -mrecord-mcount 1031 ifdef CONFIG_HAVE_NOP_MCOUNT 1032 ifeq ($(call cc-option-yn, -mnop-mcount),y) 1033 CC_FLAGS_FTRACE += -mnop-mcount 1034 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 1035 endif 1036 endif 1037endif 1038ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 1039 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 1040 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 1041 endif 1042endif 1043ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 1044 ifdef CONFIG_HAVE_C_RECORDMCOUNT 1045 BUILD_C_RECORDMCOUNT := y 1046 export BUILD_C_RECORDMCOUNT 1047 endif 1048endif 1049ifdef CONFIG_HAVE_FENTRY 1050 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 1051 ifeq ($(call cc-option-yn, -mfentry),y) 1052 CC_FLAGS_FTRACE += -mfentry 1053 CC_FLAGS_USING += -DCC_USING_FENTRY 1054 endif 1055endif 1056export CC_FLAGS_FTRACE 1057KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 1058KBUILD_AFLAGS += $(CC_FLAGS_USING) 1059endif 1060 1061# We trigger additional mismatches with less inlining 1062ifdef CONFIG_DEBUG_SECTION_MISMATCH 1063KBUILD_CFLAGS += -fno-inline-functions-called-once 1064endif 1065 1066# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 1067ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 1068KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 1069KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 1070LDFLAGS_vmlinux += --gc-sections 1071endif 1072 1073ifdef CONFIG_SHADOW_CALL_STACK 1074ifndef CONFIG_DYNAMIC_SCS 1075CC_FLAGS_SCS := -fsanitize=shadow-call-stack 1076KBUILD_CFLAGS += $(CC_FLAGS_SCS) 1077KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack 1078endif 1079export CC_FLAGS_SCS 1080endif 1081 1082ifdef CONFIG_LTO_CLANG 1083ifdef CONFIG_LTO_CLANG_FULL 1084CC_FLAGS_LTO := -flto 1085else 1086CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 1087 1088# These LLVM options were initially added with only in-process ThinLTO 1089# support, so avoid distributed ThinLTO support for now. 1090ifdef CONFIG_LTO_CLANG_THIN 1091KBUILD_LDFLAGS += $(call ld-option,--lto-whole-program-visibility -mllvm -always-rename-promoted-locals=false) 1092endif 1093endif 1094CC_FLAGS_LTO += -fvisibility=hidden 1095 1096# Limit inlining across translation units to reduce binary size 1097KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 1098endif 1099 1100ifdef CONFIG_LTO 1101KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 1102KBUILD_AFLAGS += -fno-lto 1103export CC_FLAGS_LTO 1104endif 1105 1106ifdef CONFIG_CFI 1107CC_FLAGS_CFI := -fsanitize=kcfi 1108ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS 1109 CC_FLAGS_CFI += -fsanitize-cfi-icall-experimental-normalize-integers 1110endif 1111ifdef CONFIG_FINEIBT_BHI 1112 CC_FLAGS_CFI += -fsanitize-kcfi-arity 1113endif 1114ifdef CONFIG_RUST 1115 # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects 1116 # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS. 1117 RUSTC_FLAGS_CFI := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers 1118 KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI) 1119 export RUSTC_FLAGS_CFI 1120endif 1121KBUILD_CFLAGS += $(CC_FLAGS_CFI) 1122export CC_FLAGS_CFI 1123endif 1124 1125# Architectures can define flags to add/remove for floating-point support 1126CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT 1127export CC_FLAGS_FPU 1128export CC_FLAGS_NO_FPU 1129 1130ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 1131# Set the minimal function alignment. Use the newer GCC option 1132# -fmin-function-alignment if it is available, or fall back to -falign-funtions. 1133# See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. 1134ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT 1135KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) 1136else 1137KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 1138endif 1139endif 1140 1141# arch Makefile may override CC so keep this after arch Makefile is included 1142NOSTDINC_FLAGS += -nostdinc 1143 1144# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 1145# the kernel uses only C99 flexible arrays for dynamically sized trailing 1146# arrays. Enforce this for everything that may examine structure sizes and 1147# perform bounds checking. 1148KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 1149 1150# disable invalid "can't wrap" optimizations for signed / pointers 1151KBUILD_CFLAGS += -fno-strict-overflow 1152 1153# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1154KBUILD_CFLAGS += -fno-stack-check 1155 1156# conserve stack if available 1157ifdef CONFIG_CC_IS_GCC 1158KBUILD_CFLAGS += -fconserve-stack 1159endif 1160 1161# Ensure compilers do not transform certain loops into calls to wcslen() 1162KBUILD_CFLAGS += -fno-builtin-wcslen 1163 1164# change __FILE__ to the relative path to the source directory 1165ifdef building_out_of_srctree 1166KBUILD_CPPFLAGS += -fmacro-prefix-map=$(srcroot)/= 1167ifeq ($(call rustc-option-yn, --remap-path-scope=macro),y) 1168KBUILD_RUSTFLAGS += --remap-path-prefix=$(srcroot)/= --remap-path-scope=macro 1169endif 1170endif 1171 1172# include additional Makefiles when needed 1173include-y := scripts/Makefile.warn 1174include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1175include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1176include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1177include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1178include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1179include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1180include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1181include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1182include-$(CONFIG_KSTACK_ERASE) += scripts/Makefile.kstack_erase 1183include-$(CONFIG_AUTOFDO_CLANG) += scripts/Makefile.autofdo 1184include-$(CONFIG_PROPELLER_CLANG) += scripts/Makefile.propeller 1185include-$(CONFIG_WARN_CONTEXT_ANALYSIS) += scripts/Makefile.context-analysis 1186include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1187 1188include $(addprefix $(srctree)/, $(include-y)) 1189 1190# scripts/Makefile.gcc-plugins is intentionally included last. 1191# Do not add $(call cc-option,...) below this line. When you build the kernel 1192# from the clean source tree, the GCC plugins do not exist at this point. 1193 1194# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1195KBUILD_CPPFLAGS += $(KCPPFLAGS) 1196KBUILD_AFLAGS += $(KAFLAGS) 1197KBUILD_CFLAGS += $(KCFLAGS) 1198KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1199 1200KBUILD_LDFLAGS_MODULE += --build-id=sha1 1201LDFLAGS_vmlinux += --build-id=sha1 1202 1203KBUILD_LDFLAGS += -z noexecstack 1204ifeq ($(CONFIG_LD_IS_BFD),y) 1205KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1206endif 1207 1208ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1209LDFLAGS_vmlinux += -X 1210endif 1211 1212ifeq ($(CONFIG_RELR),y) 1213# ld.lld before 15 did not support -z pack-relative-relocs. 1214LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1215endif 1216 1217# We never want expected sections to be placed heuristically by the 1218# linker. All sections should be explicitly named in the linker script. 1219ifdef CONFIG_LD_ORPHAN_WARN 1220LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1221endif 1222 1223ifneq ($(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS),) 1224LDFLAGS_vmlinux += --emit-relocs --discard-none 1225endif 1226 1227# Align the architecture of userspace programs with the kernel 1228USERFLAGS_FROM_KERNEL := --target=% 1229 1230ifdef CONFIG_ARCH_USERFLAGS 1231KBUILD_USERCFLAGS += $(CONFIG_ARCH_USERFLAGS) 1232KBUILD_USERLDFLAGS += $(CONFIG_ARCH_USERFLAGS) 1233else 1234# If not overridden also inherit the bit size 1235USERFLAGS_FROM_KERNEL += -m32 -m64 1236endif 1237 1238KBUILD_USERCFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1239KBUILD_USERLDFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1240 1241# userspace programs are linked via the compiler, use the correct linker 1242ifdef CONFIG_CC_IS_CLANG 1243KBUILD_USERLDFLAGS += --ld-path=$(LD) 1244endif 1245 1246# make the checker run with the right architecture 1247CHECKFLAGS += --arch=$(ARCH) 1248 1249# insure the checker run with the right endianness 1250CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1251 1252# the checker needs the correct machine size 1253CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1254 1255# Validate the checker is available and functional 1256ifneq ($(KBUILD_CHECKSRC), 0) 1257 ifneq ($(shell $(srctree)/scripts/checker-valid.sh $(CHECK) $(CHECKFLAGS)), 1) 1258 $(warning C=$(KBUILD_CHECKSRC) specified, but $(CHECK) is not available or not up to date) 1259 KBUILD_CHECKSRC = 0 1260 endif 1261endif 1262 1263# Default kernel image to build when no specific target is given. 1264# KBUILD_IMAGE may be overruled on the command line or 1265# set in the environment 1266# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1267# this default value 1268export KBUILD_IMAGE ?= vmlinux 1269 1270# 1271# INSTALL_PATH specifies where to place the updated kernel and system map 1272# images. Default is /boot, but you can set it to other values 1273export INSTALL_PATH ?= /boot 1274 1275# 1276# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1277# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1278# an argument if needed. Otherwise it defaults to the kernel install path 1279# 1280export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1281 1282# 1283# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1284# relocations required by build roots. This is not defined in the 1285# makefile but the argument can be passed to make if needed. 1286# 1287 1288MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1289export MODLIB 1290 1291PHONY += prepare0 1292 1293ifeq ($(KBUILD_EXTMOD),) 1294 1295build-dir := . 1296clean-dirs := $(sort . Documentation \ 1297 $(patsubst %/,%,$(filter %/, $(core-) \ 1298 $(drivers-) $(libs-)))) 1299 1300export ARCH_CORE := $(core-y) 1301export ARCH_LIB := $(filter %/, $(libs-y)) 1302export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1303# Externally visible symbols (used by link-vmlinux.sh) 1304 1305KBUILD_VMLINUX_OBJS := built-in.a $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1306KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1307 1308export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1309export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1310 1311ifdef CONFIG_TRIM_UNUSED_KSYMS 1312# For the kernel to actually contain only the needed exported symbols, 1313# we have to build modules as well to determine what those symbols are. 1314KBUILD_MODULES := y 1315endif 1316 1317PHONY += vmlinux_a 1318vmlinux_a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1319 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_a 1320 1321vmlinux.a: vmlinux_a 1322 @: 1323 1324PHONY += vmlinux_o 1325vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1326 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1327 1328vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1329 @: 1330 1331PHONY += vmlinux 1332# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1333# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1334# unrelated; the decompressors just happen to have the same base name, 1335# arch/*/boot/compressed/vmlinux. 1336# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1337# 1338# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1339# https://savannah.gnu.org/bugs/?61463 1340# For Make > 4.4, the following simple code will work: 1341# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1342vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1343vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1344vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1345 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1346 1347# The actual objects are generated when descending, 1348# make sure no implicit rule kicks in 1349$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1350 1351ifeq ($(origin KERNELRELEASE),file) 1352filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1353else 1354filechk_kernel.release = echo $(KERNELRELEASE) 1355endif 1356 1357# Store (new) KERNELRELEASE string in include/config/kernel.release 1358include/config/kernel.release: FORCE 1359 $(call filechk,kernel.release) 1360 1361# Additional helpers built in scripts/ 1362# Carefully list dependencies so we do not try to build scripts twice 1363# in parallel 1364PHONY += scripts 1365scripts: scripts_basic scripts_dtc 1366 $(Q)$(MAKE) $(build)=$(@) 1367 1368# Things we need to do before we recursively start building the kernel 1369# or the modules are listed in "prepare". 1370# A multi level approach is used. prepareN is processed before prepareN-1. 1371# archprepare is used in arch Makefiles and when processed asm symlink, 1372# version.h and scripts_basic is processed / created. 1373 1374PHONY += prepare archprepare 1375 1376archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1377 asm-generic $(version_h) include/generated/utsrelease.h \ 1378 include/generated/compile.h include/generated/autoconf.h \ 1379 include/generated/rustc_cfg remove-stale-files 1380 1381prepare0: archprepare 1382 $(Q)$(MAKE) $(build)=scripts/mod 1383 $(Q)$(MAKE) $(build)=. prepare 1384 1385# All the preparing.. 1386prepare: prepare0 1387ifdef CONFIG_RUST 1388 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1389 $(Q)$(MAKE) $(build)=rust 1390endif 1391 1392PHONY += remove-stale-files 1393remove-stale-files: 1394 $(Q)$(srctree)/scripts/remove-stale-files 1395 1396# Support for using generic headers in asm-generic 1397asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj 1398 1399PHONY += asm-generic uapi-asm-generic 1400asm-generic: uapi-asm-generic 1401 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1402 generic=include/asm-generic 1403uapi-asm-generic: 1404 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1405 generic=include/uapi/asm-generic 1406 1407# Generate some files 1408# --------------------------------------------------------------------------- 1409 1410# KERNELRELEASE can change from a few different places, meaning version.h 1411# needs to be updated, so this check is forced on all builds 1412 1413uts_len := 64 1414define filechk_utsrelease.h 1415 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1416 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1417 exit 1; \ 1418 fi; \ 1419 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1420endef 1421 1422define filechk_version.h 1423 if [ $(SUBLEVEL) -gt 255 ]; then \ 1424 echo \#define LINUX_VERSION_CODE $(shell \ 1425 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1426 else \ 1427 echo \#define LINUX_VERSION_CODE $(shell \ 1428 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1429 fi; \ 1430 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1431 ((c) > 255 ? 255 : (c)))'; \ 1432 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1433 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1434 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1435endef 1436 1437$(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1438$(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0) 1439$(version_h): FORCE 1440 $(call filechk,version.h) 1441 1442include/generated/utsrelease.h: include/config/kernel.release FORCE 1443 $(call filechk,utsrelease.h) 1444 1445filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1446 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1447 1448include/generated/compile.h: FORCE 1449 $(call filechk,compile.h) 1450 1451PHONY += headerdep 1452headerdep: 1453 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1454 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1455 1456# --------------------------------------------------------------------------- 1457# Kernel headers 1458 1459#Default location for installed headers 1460export INSTALL_HDR_PATH = $(objtree)/usr 1461 1462quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1463 cmd_headers_install = \ 1464 mkdir -p $(INSTALL_HDR_PATH); \ 1465 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1466 usr/include $(INSTALL_HDR_PATH) 1467 1468PHONY += headers_install 1469headers_install: headers 1470 $(call cmd,headers_install) 1471 1472PHONY += archheaders archscripts 1473 1474hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1475 1476PHONY += headers 1477headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders 1478ifdef HEADER_ARCH 1479 $(Q)$(MAKE) -f $(srctree)/Makefile HEADER_ARCH= SRCARCH=$(HEADER_ARCH) headers 1480else 1481 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1482 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1483endif 1484 1485ifdef CONFIG_HEADERS_INSTALL 1486prepare: headers 1487endif 1488 1489PHONY += usr_gen_init_cpio 1490usr_gen_init_cpio: scripts_basic 1491 $(Q)$(MAKE) $(build)=usr usr/gen_init_cpio 1492 1493PHONY += scripts_unifdef 1494scripts_unifdef: scripts_basic 1495 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1496 1497PHONY += scripts_gen_packed_field_checks 1498scripts_gen_packed_field_checks: scripts_basic 1499 $(Q)$(MAKE) $(build)=scripts scripts/gen_packed_field_checks 1500 1501# --------------------------------------------------------------------------- 1502# Install 1503 1504# Many distributions have the custom install script, /sbin/installkernel. 1505# If DKMS is installed, 'make install' will eventually recurse back 1506# to this Makefile to build and install external modules. 1507# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1508 1509quiet_cmd_install = INSTALL $(INSTALL_PATH) 1510 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1511 1512# --------------------------------------------------------------------------- 1513# vDSO install 1514 1515PHONY += vdso_install 1516vdso_install: export INSTALL_FILES = $(vdso-install-y) 1517vdso_install: 1518 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1519 1520# --------------------------------------------------------------------------- 1521# Tools 1522 1523ifdef CONFIG_OBJTOOL 1524prepare: tools/objtool 1525endif 1526 1527ifdef CONFIG_BPF 1528ifdef CONFIG_DEBUG_INFO_BTF 1529prepare: tools/bpf/resolve_btfids 1530endif 1531endif 1532 1533# The tools build system is not a part of Kbuild and tends to introduce 1534# its own unique issues. If you need to integrate a new tool into Kbuild, 1535# please consider locating that tool outside the tools/ tree and using the 1536# standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry 1537# here. See Documentation/kbuild/makefiles.rst for details. 1538 1539PHONY += resolve_btfids_clean 1540 1541resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1542 1543# tools/bpf/resolve_btfids directory might not exist 1544# in output directory, skip its clean in that case 1545resolve_btfids_clean: 1546ifneq ($(wildcard $(resolve_btfids_O)),) 1547 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1548endif 1549 1550PHONY += objtool_clean objtool_mrproper 1551 1552objtool_O = $(abspath $(objtree))/tools/objtool 1553 1554objtool_clean objtool_mrproper: 1555ifneq ($(wildcard $(objtool_O)),) 1556 $(Q)$(MAKE) -sC $(abs_srctree)/tools/objtool O=$(objtool_O) srctree=$(abs_srctree) $(patsubst objtool_%,%,$@) 1557endif 1558 1559tools/: FORCE 1560 $(Q)mkdir -p $(objtree)/tools 1561 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1562 1563tools/%: FORCE 1564 $(Q)mkdir -p $(objtree)/tools 1565 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1566 1567# --------------------------------------------------------------------------- 1568# Kernel selftest 1569 1570PHONY += kselftest 1571kselftest: headers 1572 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1573 1574kselftest-%: headers FORCE 1575 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1576 1577PHONY += kselftest-merge 1578kselftest-merge: 1579 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1580 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1581 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1582 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1583 1584# --------------------------------------------------------------------------- 1585# Devicetree files 1586 1587ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1588dtstree := arch/$(SRCARCH)/boot/dts 1589endif 1590 1591dtbindingtree := Documentation/devicetree/bindings 1592 1593%.yaml: dtbs_prepare 1594 $(Q)$(MAKE) $(build)=$(dtbindingtree) \ 1595 $(dtbindingtree)/$(patsubst %.yaml,%.example.dtb,$@) dt_binding_check_one 1596 1597ifneq ($(dtstree),) 1598 1599%.dtb: dtbs_prepare 1600 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1601 1602%.dtbo: dtbs_prepare 1603 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1604 1605PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1606dtbs: dtbs_prepare 1607 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1 1608 1609# include/config/kernel.release is actually needed when installing DTBs because 1610# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1611# dtbs_install depend on it as dtbs_install may run as root. 1612dtbs_prepare: include/config/kernel.release scripts_dtc 1613 1614ifneq ($(filter dtbs_check %.yaml, $(MAKECMDGOALS)),) 1615export CHECK_DTBS=y 1616endif 1617 1618ifneq ($(CHECK_DTBS),) 1619dtbs_prepare: dt_binding_schemas 1620endif 1621 1622dtbs_check: dtbs 1623 1624dtbs_install: 1625 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) 1626 1627ifdef CONFIG_OF_EARLY_FLATTREE 1628all: dtbs 1629endif 1630 1631ifdef CONFIG_GENERIC_BUILTIN_DTB 1632vmlinux: dtbs 1633endif 1634 1635endif 1636 1637PHONY += scripts_dtc 1638scripts_dtc: scripts_basic 1639 $(Q)$(MAKE) $(build)=scripts/dtc 1640 1641ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1642export CHECK_DTBS=y 1643endif 1644 1645PHONY += dt_binding_check dt_binding_schemas 1646dt_binding_check: dt_binding_schemas scripts_dtc 1647 $(Q)$(MAKE) $(build)=$(dtbindingtree) $@ 1648 1649dt_binding_schemas: 1650 $(Q)$(MAKE) $(build)=$(dtbindingtree) 1651 1652PHONY += dt_compatible_check 1653dt_compatible_check: dt_binding_schemas 1654 $(Q)$(MAKE) $(build)=$(dtbindingtree) $@ 1655 1656# --------------------------------------------------------------------------- 1657# Modules 1658 1659ifdef CONFIG_MODULES 1660 1661# By default, build modules as well 1662 1663all: modules 1664 1665# When we're building modules with modversions, we need to consider 1666# the built-in objects during the descend as well, in order to 1667# make sure the checksums are up to date before we record them. 1668ifdef CONFIG_MODVERSIONS 1669 KBUILD_BUILTIN := y 1670endif 1671 1672# Build modules 1673# 1674 1675# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1676# is an exception. 1677ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1678KBUILD_BUILTIN := y 1679modules: vmlinux 1680endif 1681 1682modules: modules_prepare 1683 1684# Target to prepare building external modules 1685modules_prepare: prepare 1686 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1687 1688endif # CONFIG_MODULES 1689 1690### 1691# Cleaning is done on three levels. 1692# make clean Delete most generated files 1693# Leave enough to build external modules 1694# make mrproper Delete the current configuration, and all generated files 1695# make distclean Remove editor backup files, patch leftover files and the like 1696 1697# Directories & files removed with 'make clean' 1698CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1699 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1700 modules.builtin.ranges vmlinux.o.map vmlinux.unstripped \ 1701 vmlinux.thinlto-index builtin.order \ 1702 compile_commands.json rust/test \ 1703 rust-project.json .vmlinux.objs .vmlinux.export.c \ 1704 .builtin-dtbs-list .builtin-dtbs.S 1705 1706# Directories & files removed with 'make mrproper' 1707MRPROPER_FILES += include/config include/generated \ 1708 arch/$(SRCARCH)/include/generated .objdiff \ 1709 debian snap tar-install PKGBUILD pacman \ 1710 .config .config.old .version \ 1711 Module.symvers \ 1712 certs/signing_key.pem \ 1713 certs/x509.genkey \ 1714 vmlinux-gdb.py \ 1715 rpmbuild \ 1716 rust/libmacros.so rust/libmacros.dylib \ 1717 rust/libpin_init_internal.so rust/libpin_init_internal.dylib \ 1718 rust/libzerocopy_derive.so rust/libzerocopy_derive.dylib 1719 1720# clean - Delete most, but leave enough to build external modules 1721# 1722clean: private rm-files := $(CLEAN_FILES) 1723 1724PHONY += archclean vmlinuxclean 1725 1726vmlinuxclean: 1727 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1728 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1729 1730clean: archclean vmlinuxclean resolve_btfids_clean objtool_clean 1731 1732# mrproper - Delete all generated files, including .config 1733# 1734mrproper: private rm-files := $(MRPROPER_FILES) 1735mrproper-dirs := $(addprefix _mrproper_,scripts) 1736 1737PHONY += $(mrproper-dirs) mrproper 1738$(mrproper-dirs): 1739 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1740 1741mrproper: clean objtool_mrproper $(mrproper-dirs) 1742 $(call cmd,rmfiles) 1743 @find . $(RCS_FIND_IGNORE) \ 1744 \( -name '*.rmeta' \) \ 1745 -type f -print | xargs rm -f 1746 1747# distclean 1748# 1749PHONY += distclean 1750 1751distclean: mrproper 1752 @find . $(RCS_FIND_IGNORE) \ 1753 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1754 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1755 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1756 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1757 -type f -print | xargs rm -f 1758 1759 1760# Packaging of the kernel to various formats 1761# --------------------------------------------------------------------------- 1762 1763modules-cpio-pkg: usr_gen_init_cpio 1764 1765%src-pkg: FORCE 1766 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1767%pkg: include/config/kernel.release FORCE 1768 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1769 1770# Brief documentation of the typical targets used 1771# --------------------------------------------------------------------------- 1772 1773boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1774boards := $(sort $(notdir $(boards))) 1775board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1776board-dirs := $(sort $(notdir $(board-dirs:/=))) 1777 1778PHONY += help 1779help: 1780 @echo 'Cleaning targets:' 1781 @echo ' clean - Remove most generated files but keep the config and' 1782 @echo ' enough build support to build external modules' 1783 @echo ' mrproper - Remove all generated files + config + various backup files' 1784 @echo ' distclean - mrproper + remove editor backup and patch files' 1785 @echo '' 1786 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1787 @echo '' 1788 @echo 'Other generic targets:' 1789 @echo ' all - Build all targets marked with [*]' 1790 @echo '* vmlinux - Build the bare kernel' 1791 @echo '* modules - Build all modules' 1792 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1793 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1794 @echo ' dir/ - Build all files in dir and below' 1795 @echo ' dir/file.[ois] - Build specified target only' 1796 @echo ' dir/file.ll - Build the LLVM assembly file' 1797 @echo ' (requires compiler support for LLVM assembly generation)' 1798 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1799 @echo ' (requires a recent binutils and recent build (System.map))' 1800 @echo ' dir/file.ko - Build module including final link' 1801 @echo ' modules_prepare - Set up for building external modules' 1802 @echo ' tags/TAGS - Generate tags file for editors' 1803 @echo ' cscope - Generate cscope index' 1804 @echo ' gtags - Generate GNU GLOBAL index' 1805 @echo ' kernelrelease - Output the release version string (use with make -s)' 1806 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1807 @echo ' image_name - Output the image name (use with make -s)' 1808 @echo ' headers - Build ready-to-install UAPI headers in usr/include' 1809 @echo ' headers_install - Install sanitised kernel UAPI headers to INSTALL_HDR_PATH'; \ 1810 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1811 echo '' 1812 @echo 'Static analysers:' 1813 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1814 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1815 @echo ' versioncheck - Sanity check on version.h usage' 1816 @echo ' includecheck - Check for duplicate included header files' 1817 @echo ' headerdep - Detect inclusion cycles in headers' 1818 @echo ' coccicheck - Check with Coccinelle' 1819 @echo ' kconfig-sym-check - Check for dangling Kconfig symbol references' 1820 @echo ' clang-analyzer - Check with clang static analyzer' 1821 @echo ' clang-tidy - Check with clang-tidy' 1822 @echo '' 1823 @echo 'Tools:' 1824 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1825 @echo '' 1826 @echo 'Kernel selftest:' 1827 @echo ' kselftest - Build and run kernel selftest' 1828 @echo ' Build, install, and boot kernel before' 1829 @echo ' running kselftest on it' 1830 @echo ' Run as root for full coverage' 1831 @echo ' kselftest-all - Build kernel selftest' 1832 @echo ' kselftest-install - Build and install kernel selftest' 1833 @echo ' kselftest-clean - Remove all generated kselftest files' 1834 @echo ' kselftest-merge - Merge all the config dependencies of' 1835 @echo ' kselftest to existing .config.' 1836 @echo '' 1837 @echo 'Rust targets:' 1838 @echo ' rustavailable - Checks whether the Rust toolchain is' 1839 @echo ' available and, if not, explains why.' 1840 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1841 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1842 @echo ' is formatted, printing a diff otherwise.' 1843 @echo ' rustdoc - Generate Rust documentation' 1844 @echo ' (requires kernel .config)' 1845 @echo ' rusttest - Runs the Rust tests' 1846 @echo ' (requires kernel .config; downloads external repos)' 1847 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1848 @echo ' (requires kernel .config)' 1849 @echo ' dir/file.[os] - Build specified target only' 1850 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1851 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1852 @echo ' The output is not intended to be compilable.' 1853 @echo ' dir/file.ll - Build the LLVM assembly file' 1854 @echo '' 1855 @$(if $(dtstree), \ 1856 echo 'Devicetree:'; \ 1857 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1858 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1859 echo ' dt_binding_check - Validate device tree binding documents and examples'; \ 1860 echo ' dt_binding_schemas - Build processed device tree binding schemas'; \ 1861 echo ' dtbs_check - Validate device tree source files';\ 1862 echo '') 1863 1864 @echo 'Userspace tools targets:' 1865 @echo ' use "make tools/help"' 1866 @echo ' or "cd tools; make help"' 1867 @echo '' 1868 @echo 'Kernel packaging:' 1869 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1870 @echo '' 1871 @echo 'Documentation targets:' 1872 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1873 @echo '' 1874 @echo 'Architecture-specific targets ($(SRCARCH)):' 1875 @$(or $(archhelp),\ 1876 echo ' No architecture-specific help defined for $(SRCARCH)') 1877 @echo '' 1878 @$(if $(boards), \ 1879 $(foreach b, $(boards), \ 1880 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1881 echo '') 1882 @$(if $(board-dirs), \ 1883 $(foreach b, $(board-dirs), \ 1884 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1885 printf " %-16s - Show all of the above\\n" help-boards; \ 1886 echo '') 1887 1888 @echo ' make V=n [targets] 1: verbose build' 1889 @echo ' 2: give reason for rebuild of target' 1890 @echo ' V=1 and V=2 can be combined with V=12' 1891 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1892 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1893 @echo ' (sparse by default)' 1894 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1895 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1896 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where' 1897 @echo ' 1: warnings which may be relevant and do not occur too often' 1898 @echo ' 2: warnings which occur quite often but may still be relevant' 1899 @echo ' 3: more obscure warnings, can most likely be ignored' 1900 @echo ' c: extra checks in the configuration stage (Kconfig)' 1901 @echo ' e: warnings are being treated as errors' 1902 @echo ' Multiple levels can be combined with W=12 or W=123' 1903 @echo ' make UT=1 [targets] Warn if a tracepoint is defined but not used.' 1904 @echo ' [ This will be removed when all current unused tracepoints are eliminated. ]' 1905 @$(if $(dtstree), \ 1906 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1907 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1908 ) 1909 @echo '' 1910 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1911 @echo 'For further info see the ./README file' 1912 1913 1914help-board-dirs := $(addprefix help-,$(board-dirs)) 1915 1916help-boards: $(help-board-dirs) 1917 1918boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1919 1920$(help-board-dirs): help-%: 1921 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1922 @$(if $(boards-per-dir), \ 1923 $(foreach b, $(boards-per-dir), \ 1924 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1925 echo '') 1926 1927 1928# Documentation targets 1929# --------------------------------------------------------------------------- 1930DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1931 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs mandocs \ 1932 htmldocs-redirects 1933 1934PHONY += $(DOC_TARGETS) 1935$(DOC_TARGETS): 1936 $(Q)$(MAKE) $(build)=Documentation $@ 1937 1938 1939# Rust targets 1940# --------------------------------------------------------------------------- 1941 1942# "Is Rust available?" target 1943PHONY += rustavailable 1944rustavailable: 1945 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1946 1947# Documentation target 1948# 1949# Using the singular to avoid running afoul of `no-dot-config-targets`. 1950PHONY += rustdoc 1951rustdoc: prepare 1952 $(Q)$(MAKE) $(build)=rust $@ 1953 1954# Testing target 1955PHONY += rusttest 1956rusttest: prepare 1957 $(Q)$(MAKE) $(build)=rust $@ 1958 1959# Formatting targets 1960# 1961# Generated files as well as vendored crates are skipped. 1962PHONY += rustfmt rustfmtcheck 1963 1964rustfmt: 1965 $(Q)find $(srctree) $(RCS_FIND_IGNORE) \ 1966 \( \ 1967 -path $(srctree)/rust/proc-macro2 \ 1968 -o -path $(srctree)/rust/quote \ 1969 -o -path $(srctree)/rust/syn \ 1970 -o -path $(srctree)/rust/zerocopy \ 1971 -o -path $(srctree)/rust/zerocopy-derive \ 1972 \) -prune -o \ 1973 -type f -a -name '*.rs' -a ! -name '*generated*' -print \ 1974 | xargs $(RUSTFMT) $(rustfmt_flags) 1975 1976rustfmtcheck: rustfmt_flags = --check 1977rustfmtcheck: rustfmt 1978 1979# Misc 1980# --------------------------------------------------------------------------- 1981 1982PHONY += misc-check 1983misc-check: 1984 $(Q)$(srctree)/scripts/misc-check 1985 1986all: misc-check 1987 1988PHONY += scripts_gdb 1989scripts_gdb: prepare0 1990 $(Q)$(MAKE) $(build)=scripts/gdb 1991 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1992 1993ifdef CONFIG_GDB_SCRIPTS 1994all: scripts_gdb 1995endif 1996 1997else # KBUILD_EXTMOD 1998 1999filechk_kernel.release = echo $(KERNELRELEASE) 2000 2001### 2002# External module support. 2003# When building external modules the kernel used as basis is considered 2004# read-only, and no consistency checks are made and the make 2005# system is not used on the basis kernel. If updates are required 2006# in the basis kernel ordinary make commands (without M=...) must be used. 2007 2008# We are always building only modules. 2009KBUILD_BUILTIN := 2010KBUILD_MODULES := y 2011 2012build-dir := . 2013 2014clean-dirs := . 2015clean: private rm-files := Module.symvers modules.nsdeps compile_commands.json 2016 2017PHONY += prepare 2018# now expand this into a simple variable to reduce the cost of shell evaluations 2019prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 2020prepare: PAHOLE_VERSION := $(PAHOLE_VERSION) 2021prepare: 2022 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 2023 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 2024 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 2025 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 2026 fi 2027 @if [ "$(PAHOLE_VERSION)" != "$(CONFIG_PAHOLE_VERSION)" ]; then \ 2028 echo >&2 "warning: pahole version differs from the one used to build the kernel"; \ 2029 echo >&2 " The kernel was built with: $(CONFIG_PAHOLE_VERSION)"; \ 2030 echo >&2 " You are using: $(PAHOLE_VERSION)"; \ 2031 fi 2032 2033PHONY += help 2034help: 2035 @echo ' Building external modules.' 2036 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 2037 @echo '' 2038 @echo ' modules - default target, build the module(s)' 2039 @echo ' modules_install - install the module' 2040 @echo ' clean - remove generated files in module directory only' 2041 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 2042 @echo '' 2043 2044ifndef CONFIG_MODULES 2045modules modules_install: __external_modules_error 2046__external_modules_error: 2047 @echo >&2 '***' 2048 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 2049 @echo >&2 '*** You cannot build or install external modules.' 2050 @echo >&2 '***' 2051 @false 2052endif 2053 2054endif # KBUILD_EXTMOD 2055 2056# --------------------------------------------------------------------------- 2057# Modules 2058 2059PHONY += modules modules_install modules_sign modules_prepare 2060 2061modules_install: 2062 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 2063 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 2064 2065ifeq ($(CONFIG_MODULE_SIG),y) 2066# modules_sign is a subset of modules_install. 2067# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 2068modules_sign: modules_install 2069 @: 2070else 2071modules_sign: 2072 @echo >&2 '***' 2073 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 2074 @echo >&2 '***' 2075 @false 2076endif 2077 2078ifdef CONFIG_MODULES 2079 2080modules.order: $(build-dir) 2081 @: 2082 2083# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 2084# This is solely useful to speed up test compiles. 2085modules: modpost 2086ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2087 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2088endif 2089 2090PHONY += modules_check 2091modules_check: modules.order 2092 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 2093 2094else # CONFIG_MODULES 2095 2096modules: 2097 @: 2098 2099KBUILD_MODULES := 2100 2101endif # CONFIG_MODULES 2102 2103PHONY += modpost 2104modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 2105 $(if $(KBUILD_MODULES), modules_check) 2106 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2107 2108# Single targets 2109# --------------------------------------------------------------------------- 2110# To build individual files in subdirectories, you can do like this: 2111# 2112# make foo/bar/baz.s 2113# 2114# The supported suffixes for single-target are listed in 'single-targets' 2115# 2116# To build only under specific subdirectories, you can do like this: 2117# 2118# make foo/bar/baz/ 2119 2120ifdef single-build 2121 2122# .ko is special because modpost is needed 2123single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 2124single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 2125 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 2126 2127$(single-ko): single_modules 2128 @: 2129$(single-no-ko): $(build-dir) 2130 @: 2131 2132# Remove modules.order when done because it is not the real one. 2133PHONY += single_modules 2134single_modules: $(single-no-ko) modules_prepare 2135 $(Q){ $(foreach m, $(single-ko), echo $(m:%.ko=%.o);) } > modules.order 2136 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2137ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2138 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2139endif 2140 $(Q)rm -f modules.order 2141 2142single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 2143 2144KBUILD_MODULES := y 2145 2146endif 2147 2148prepare: outputmakefile 2149 2150# Preset locale variables to speed up the build process. Limit locale 2151# tweaks to this spot to avoid wrong language settings when running 2152# make menuconfig etc. 2153# Error messages still appears in the original language 2154PHONY += $(build-dir) 2155$(build-dir): prepare 2156 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 2157 2158clean-dirs := $(addprefix _clean_, $(clean-dirs)) 2159PHONY += $(clean-dirs) clean 2160$(clean-dirs): 2161 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 2162 2163clean: $(clean-dirs) 2164 $(call cmd,rmfiles) 2165 @find . $(RCS_FIND_IGNORE) \ 2166 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 2167 -o -name '*.ko.*' -o -name '*.o.thinlto.bc' \ 2168 -o -name '*.dtb' -o -name '*.dtbo' \ 2169 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 2170 -o -name '*.dt.yaml' -o -name 'dtbs-list' \ 2171 -o -name '*.dwo' -o -name '*.lst' \ 2172 -o -name '*.su' -o -name '*.mod' \ 2173 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 2174 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 2175 -o -name '*.asn1.[ch]' \ 2176 -o -name '*.symtypes' -o -name 'modules.order' \ 2177 -o -name '*.c.[012]*.*' \ 2178 -o -name '*.ll' \ 2179 -o -name '*.gcno' \ 2180 -o -name '*.long-type-*.txt' \ 2181 \) -type f -print \ 2182 -o -name '.tmp_*' -print \ 2183 | xargs rm -rf 2184 2185# Generate tags for editors 2186# --------------------------------------------------------------------------- 2187quiet_cmd_tags = GEN $@ 2188 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 2189 2190tags TAGS cscope gtags: FORCE 2191 $(call cmd,tags) 2192 2193# Generate rust-project.json (a file that describes the structure of non-Cargo 2194# Rust projects) for rust-analyzer (an implementation of the Language Server 2195# Protocol). 2196PHONY += rust-analyzer 2197rust-analyzer: 2198 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 2199ifdef KBUILD_EXTMOD 2200# FIXME: external modules must not descend into a sub-directory of the kernel 2201 $(Q)$(MAKE) $(build)=$(objtree)/rust src=$(srctree)/rust $@ 2202else 2203 $(Q)$(MAKE) $(build)=rust $@ 2204endif 2205 2206# Script to generate missing namespace dependencies 2207# --------------------------------------------------------------------------- 2208 2209PHONY += nsdeps 2210nsdeps: export KBUILD_NSDEPS=1 2211nsdeps: modules 2212 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 2213 2214# Clang Tooling 2215# --------------------------------------------------------------------------- 2216 2217quiet_cmd_gen_compile_commands = GEN $@ 2218 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2219 2220compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \ 2221 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2222 $(if $(CONFIG_MODULES), modules.order) FORCE 2223 $(call if_changed,gen_compile_commands) 2224 2225targets += compile_commands.json 2226 2227PHONY += clang-tidy clang-analyzer 2228 2229ifdef CONFIG_CC_IS_CLANG 2230quiet_cmd_clang_tools = CHECK $< 2231 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2232 2233clang-tidy clang-analyzer: compile_commands.json 2234 $(call cmd,clang_tools) 2235else 2236clang-tidy clang-analyzer: 2237 @echo "$@ requires CC=clang" >&2 2238 @false 2239endif 2240 2241# Scripts to check various things for consistency 2242# --------------------------------------------------------------------------- 2243 2244PHONY += includecheck versioncheck coccicheck kconfig-sym-check 2245 2246includecheck: 2247 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2248 -name '*.[hcS]' -type f -print | sort \ 2249 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2250 2251versioncheck: 2252 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2253 -name '*.[hcS]' -type f -print | sort \ 2254 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2255 2256coccicheck: 2257 $(Q)$(BASH) $(srctree)/scripts/$@ 2258 2259kconfig-sym-check: 2260 $(Q)$(PERL) $(srctree)/scripts/kconfig/kconfig-sym-check.pl $(srctree) $(KCONFIG_SYM_CHECK_EXCLUDES) 2261 2262PHONY += checkstack kernelrelease kernelversion image_name 2263 2264# UML needs a little special treatment here. It wants to use the host 2265# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2266# else wants $(ARCH), including people doing cross-builds, which means 2267# that $(SUBARCH) doesn't work here. 2268ifeq ($(ARCH), um) 2269CHECKSTACK_ARCH := $(SUBARCH) 2270else 2271CHECKSTACK_ARCH := $(ARCH) 2272endif 2273MINSTACKSIZE ?= 100 2274checkstack: 2275 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2276 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2277 2278kernelrelease: 2279 @$(filechk_kernel.release) 2280 2281kernelversion: 2282 @echo $(KERNELVERSION) 2283 2284image_name: 2285 @echo $(KBUILD_IMAGE) 2286 2287PHONY += run-command 2288run-command: 2289 $(Q)$(KBUILD_RUN_COMMAND) 2290 2291quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2292 cmd_rmfiles = rm -rf $(rm-files) 2293 2294# read saved command lines for existing targets 2295existing-targets := $(wildcard $(sort $(targets))) 2296 2297-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2298 2299endif # config-build 2300endif # mixed-build 2301endif # need-sub-make 2302 2303PHONY += FORCE 2304FORCE: 2305 2306# Declare the contents of the PHONY variable as phony. We keep that 2307# information in a variable so we can use it in if_changed and friends. 2308.PHONY: $(PHONY) 2309