1# SPDX-License-Identifier: GPL-2.0 2VERSION = 7 3PATCHLEVEL = 0 4SUBLEVEL = 0 5EXTRAVERSION = 6NAME = Baby Opossum Posse 7 8# *DOCUMENTATION* 9# To see a list of typical targets execute "make help" 10# More info can be located in ./README 11# Comments in this file are targeted only to the developer, do not 12# expect to learn how to build the kernel reading this file. 13 14ifeq ($(filter output-sync,$(.FEATURES)),) 15$(error GNU Make >= 4.0 is required. Your Make version is $(MAKE_VERSION)) 16endif 17 18$(if $(filter __%, $(MAKECMDGOALS)), \ 19 $(error targets prefixed with '__' are only for internal use)) 20 21# That's our default target when none is given on the command line 22PHONY := __all 23__all: 24 25# We are using a recursive build, so we need to do a little thinking 26# to get the ordering right. 27# 28# Most importantly: sub-Makefiles should only ever modify files in 29# their own directory. If in some directory we have a dependency on 30# a file in another dir (which doesn't happen often, but it's often 31# unavoidable when linking the built-in.a targets which finally 32# turn into vmlinux), we will call a sub make in that other dir, and 33# after that we are sure that everything which is in that other dir 34# is now up to date. 35# 36# The only cases where we need to modify files which have global 37# effects are thus separated out and done before the recursive 38# descending is started. They are now explicitly listed as the 39# prepare rule. 40 41this-makefile := $(lastword $(MAKEFILE_LIST)) 42abs_srctree := $(realpath $(dir $(this-makefile))) 43abs_output := $(CURDIR) 44 45ifneq ($(sub_make_done),1) 46 47# Do not use make's built-in rules and variables 48# (this increases performance and avoids hard-to-debug behaviour) 49MAKEFLAGS += -rR 50 51# Avoid funny character set dependencies 52unexport LC_ALL 53LC_COLLATE=C 54LC_NUMERIC=C 55export LC_COLLATE LC_NUMERIC 56 57# Avoid interference with shell env settings 58unexport GREP_OPTIONS 59 60# Beautify output 61# --------------------------------------------------------------------------- 62# 63# Most of build commands in Kbuild start with "cmd_". You can optionally define 64# "quiet_cmd_*". If defined, the short log is printed. Otherwise, no log from 65# that command is printed by default. 66# 67# e.g.) 68# quiet_cmd_depmod = DEPMOD $(MODLIB) 69# cmd_depmod = $(srctree)/scripts/depmod.sh $(DEPMOD) $(KERNELRELEASE) 70# 71# A simple variant is to prefix commands with $(Q) - that's useful 72# for commands that shall be hidden in non-verbose mode. 73# 74# $(Q)$(MAKE) $(build)=scripts/basic 75# 76# If KBUILD_VERBOSE contains 1, the whole command is echoed. 77# If KBUILD_VERBOSE contains 2, the reason for rebuilding is printed. 78# 79# To put more focus on warnings, be less verbose as default 80# Use 'make V=1' to see the full commands 81 82ifeq ("$(origin V)", "command line") 83 KBUILD_VERBOSE = $(V) 84endif 85 86quiet = quiet_ 87Q = @ 88 89ifneq ($(findstring 1, $(KBUILD_VERBOSE)),) 90 quiet = 91 Q = 92endif 93 94# If the user is running make -s (silent mode), suppress echoing of 95# commands 96ifneq ($(findstring s,$(firstword -$(MAKEFLAGS))),) 97quiet=silent_ 98override KBUILD_VERBOSE := 99endif 100 101export quiet Q KBUILD_VERBOSE 102 103# Call a source code checker (by default, "sparse") as part of the 104# C compilation. 105# 106# Use 'make C=1' to enable checking of only re-compiled files. 107# Use 'make C=2' to enable checking of *all* source files, regardless 108# of whether they are re-compiled or not. 109# 110# See the file "Documentation/dev-tools/sparse.rst" for more details, 111# including where to get the "sparse" utility. 112 113ifeq ("$(origin C)", "command line") 114 KBUILD_CHECKSRC = $(C) 115endif 116ifndef KBUILD_CHECKSRC 117 KBUILD_CHECKSRC = 0 118endif 119 120export KBUILD_CHECKSRC 121 122# Enable "clippy" (a linter) as part of the Rust compilation. 123# 124# Use 'make CLIPPY=1' to enable it. 125ifeq ("$(origin CLIPPY)", "command line") 126 KBUILD_CLIPPY := $(CLIPPY) 127endif 128 129export KBUILD_CLIPPY 130 131# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 132# directory of external module to build. Setting M= takes precedence. 133ifeq ("$(origin M)", "command line") 134 KBUILD_EXTMOD := $(M) 135endif 136 137ifeq ("$(origin MO)", "command line") 138 KBUILD_EXTMOD_OUTPUT := $(MO) 139endif 140 141$(if $(word 2, $(KBUILD_EXTMOD)), \ 142 $(error building multiple external modules is not supported)) 143 144$(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \ 145 $(error module directory path cannot contain '$x'))) 146 147# Remove trailing slashes 148ifneq ($(filter %/, $(KBUILD_EXTMOD)),) 149KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) 150endif 151 152export KBUILD_EXTMOD 153 154ifeq ("$(origin W)", "command line") 155 KBUILD_EXTRA_WARN := $(W) 156endif 157 158export KBUILD_EXTRA_WARN 159 160# Kbuild will save output files in the current working directory. 161# This does not need to match to the root of the kernel source tree. 162# 163# For example, you can do this: 164# 165# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 166# 167# If you want to save output files in a different location, there are 168# two syntaxes to specify it. 169# 170# 1) O= 171# Use "make O=dir/to/store/output/files/" 172# 173# 2) Set KBUILD_OUTPUT 174# Set the environment variable KBUILD_OUTPUT to point to the output directory. 175# export KBUILD_OUTPUT=dir/to/store/output/files/; make 176# 177# The O= assignment takes precedence over the KBUILD_OUTPUT environment 178# variable. 179 180ifeq ("$(origin O)", "command line") 181 KBUILD_OUTPUT := $(O) 182endif 183 184ifdef KBUILD_EXTMOD 185 ifdef KBUILD_OUTPUT 186 objtree := $(realpath $(KBUILD_OUTPUT)) 187 $(if $(objtree),,$(error specified kernel directory "$(KBUILD_OUTPUT)" does not exist)) 188 else 189 objtree := $(abs_srctree) 190 endif 191 # If Make is invoked from the kernel directory (either kernel 192 # source directory or kernel build directory), external modules 193 # are built in $(KBUILD_EXTMOD) for backward compatibility, 194 # otherwise, built in the current directory. 195 output := $(or $(KBUILD_EXTMOD_OUTPUT),$(if $(filter $(CURDIR),$(objtree) $(abs_srctree)),$(KBUILD_EXTMOD))) 196 # KBUILD_EXTMOD might be a relative path. Remember its absolute path before 197 # Make changes the working directory. 198 srcroot := $(realpath $(KBUILD_EXTMOD)) 199 $(if $(srcroot),,$(error specified external module directory "$(KBUILD_EXTMOD)" does not exist)) 200else 201 objtree := . 202 output := $(KBUILD_OUTPUT) 203endif 204 205export objtree srcroot 206 207# Do we want to change the working directory? 208ifneq ($(output),) 209# $(realpath ...) gets empty if the path does not exist. Run 'mkdir -p' first. 210$(shell mkdir -p "$(output)") 211# $(realpath ...) resolves symlinks 212abs_output := $(realpath $(output)) 213$(if $(abs_output),,$(error failed to create output directory "$(output)")) 214endif 215 216ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 217$(error source directory cannot contain spaces or colons) 218endif 219 220export sub_make_done := 1 221 222endif # sub_make_done 223 224ifeq ($(abs_output),$(CURDIR)) 225# Suppress "Entering directory ..." if we are at the final work directory. 226no-print-directory := --no-print-directory 227else 228# Recursion to show "Entering directory ..." 229need-sub-make := 1 230endif 231 232ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),) 233# If --no-print-directory is unset, recurse once again to set it. 234# You may end up recursing into __sub-make twice. This is needed due to the 235# behavior change in GNU Make 4.4.1. 236need-sub-make := 1 237endif 238 239ifeq ($(need-sub-make),1) 240 241PHONY += $(MAKECMDGOALS) __sub-make 242 243$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 244 @: 245 246# Invoke a second make in the output directory, passing relevant variables 247__sub-make: 248 $(Q)$(MAKE) $(no-print-directory) -C $(abs_output) \ 249 -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 250 251else # need-sub-make 252 253# We process the rest of the Makefile if this is the final invocation of make 254 255ifndef KBUILD_EXTMOD 256srcroot := $(abs_srctree) 257endif 258 259ifeq ($(srcroot),$(CURDIR)) 260building_out_of_srctree := 261else 262export building_out_of_srctree := 1 263endif 264 265ifdef KBUILD_ABS_SRCTREE 266 # Do nothing. Use the absolute path. 267else ifeq ($(srcroot),$(CURDIR)) 268 # Building in the source. 269 srcroot := . 270else ifeq ($(srcroot)/,$(dir $(CURDIR))) 271 # Building in a subdirectory of the source. 272 srcroot := .. 273endif 274 275export srctree := $(if $(KBUILD_EXTMOD),$(abs_srctree),$(srcroot)) 276 277ifdef building_out_of_srctree 278export VPATH := $(srcroot) 279else 280VPATH := 281endif 282 283# To make sure we do not include .config for any of the *config targets 284# catch them early, and hand them over to scripts/kconfig/Makefile 285# It is allowed to specify more targets when calling make, including 286# mixing *config targets and build targets. 287# For example 'make oldconfig all'. 288# Detect when mixed targets is specified, and make a second invocation 289# of make so .config is not included in this case either (for *config). 290 291version_h := include/generated/uapi/linux/version.h 292 293clean-targets := %clean mrproper cleandocs 294no-dot-config-targets := $(clean-targets) \ 295 cscope gtags TAGS tags help% %docs check% coccicheck \ 296 $(version_h) headers headers_% archheaders archscripts \ 297 %asm-generic kernelversion %src-pkg dt_binding_check \ 298 outputmakefile rustavailable rustfmt rustfmtcheck \ 299 run-command 300no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \ 301 image_name 302single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %/ 303 304config-build := 305mixed-build := 306need-config := 1 307may-sync-config := 1 308single-build := 309 310ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 311 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 312 need-config := 313 endif 314endif 315 316ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 317 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 318 may-sync-config := 319 endif 320endif 321 322need-compiler := $(may-sync-config) 323 324ifneq ($(KBUILD_EXTMOD),) 325 may-sync-config := 326endif 327 328ifeq ($(KBUILD_EXTMOD),) 329 ifneq ($(filter %config,$(MAKECMDGOALS)),) 330 config-build := 1 331 ifneq ($(words $(MAKECMDGOALS)),1) 332 mixed-build := 1 333 endif 334 endif 335endif 336 337# We cannot build single targets and the others at the same time 338ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 339 single-build := 1 340 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 341 mixed-build := 1 342 endif 343endif 344 345# For "make -j clean all", "make -j mrproper defconfig all", etc. 346ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 347 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 348 mixed-build := 1 349 endif 350endif 351 352# install and modules_install need also be processed one by one 353ifneq ($(filter install,$(MAKECMDGOALS)),) 354 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 355 mixed-build := 1 356 endif 357endif 358 359ifdef mixed-build 360# =========================================================================== 361# We're called with mixed targets (*config and build targets). 362# Handle them one by one. 363 364PHONY += $(MAKECMDGOALS) __build_one_by_one 365 366$(MAKECMDGOALS): __build_one_by_one 367 @: 368 369__build_one_by_one: 370 $(Q)set -e; \ 371 for i in $(MAKECMDGOALS); do \ 372 $(MAKE) -f $(srctree)/Makefile $$i; \ 373 done 374 375else # !mixed-build 376 377include $(srctree)/scripts/Kbuild.include 378 379# Read KERNELRELEASE from include/config/kernel.release (if it exists) 380KERNELRELEASE = $(call read-file, $(objtree)/include/config/kernel.release) 381KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 382export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 383 384include $(srctree)/scripts/subarch.include 385 386# Cross compiling and selecting different set of gcc/bin-utils 387# --------------------------------------------------------------------------- 388# 389# When performing cross compilation for other architectures ARCH shall be set 390# to the target architecture. (See arch/* for the possibilities). 391# ARCH can be set during invocation of make: 392# make ARCH=arm64 393# Another way is to have ARCH set in the environment. 394# The default ARCH is the host where make is executed. 395 396# CROSS_COMPILE specify the prefix used for all executables used 397# during compilation. Only gcc and related bin-utils executables 398# are prefixed with $(CROSS_COMPILE). 399# CROSS_COMPILE can be set on the command line 400# make CROSS_COMPILE=aarch64-linux-gnu- 401# Alternatively CROSS_COMPILE can be set in the environment. 402# Default value for CROSS_COMPILE is not to prefix executables 403# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 404ARCH ?= $(SUBARCH) 405 406# Architecture as present in compile.h 407UTS_MACHINE := $(ARCH) 408SRCARCH := $(ARCH) 409 410# Additional ARCH settings for x86 411ifeq ($(ARCH),i386) 412 SRCARCH := x86 413endif 414ifeq ($(ARCH),x86_64) 415 SRCARCH := x86 416endif 417 418# Additional ARCH settings for sparc 419ifeq ($(ARCH),sparc32) 420 SRCARCH := sparc 421endif 422ifeq ($(ARCH),sparc64) 423 SRCARCH := sparc 424endif 425 426# Additional ARCH settings for parisc 427ifeq ($(ARCH),parisc64) 428 SRCARCH := parisc 429endif 430 431export cross_compiling := 432ifneq ($(SRCARCH),$(SUBARCH)) 433cross_compiling := 1 434endif 435 436KCONFIG_CONFIG ?= .config 437export KCONFIG_CONFIG 438 439# SHELL used by kbuild 440CONFIG_SHELL := sh 441 442HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 443HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 444HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 445 446ifneq ($(LLVM),) 447ifneq ($(filter %/,$(LLVM)),) 448LLVM_PREFIX := $(LLVM) 449else ifneq ($(filter -%,$(LLVM)),) 450LLVM_SUFFIX := $(LLVM) 451else ifneq ($(LLVM),1) 452$(error Invalid value for LLVM, see Documentation/kbuild/llvm.rst) 453endif 454 455HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 456HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 457else 458HOSTCC = gcc 459HOSTCXX = g++ 460endif 461HOSTRUSTC = rustc 462HOSTPKG_CONFIG = pkg-config 463 464# the KERNELDOC macro needs to be exported, as scripts/Makefile.build 465# has a logic to call it 466KERNELDOC = $(srctree)/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 -Wclippy::ignored_unit_patterns \ 490 -Aclippy::incompatible_msrv \ 491 -Wclippy::mut_mut \ 492 -Wclippy::needless_bitwise_bool \ 493 -Aclippy::needless_lifetimes \ 494 -Wclippy::no_mangle_with_rust_abi \ 495 -Wclippy::ptr_as_ptr \ 496 -Wclippy::ptr_cast_constness \ 497 -Wclippy::ref_as_ptr \ 498 -Wclippy::undocumented_unsafe_blocks \ 499 -Aclippy::uninlined_format_args \ 500 -Wclippy::unnecessary_safety_comment \ 501 -Wclippy::unnecessary_safety_doc \ 502 -Wrustdoc::missing_crate_level_docs \ 503 -Wrustdoc::unescaped_backticks 504 505KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \ 506 $(HOSTCFLAGS) -I $(srctree)/scripts/include 507KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \ 508 -I $(srctree)/scripts/include 509KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 510 -Zallow-features= 511KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 512KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 513KBUILD_PROCMACROLDFLAGS := $(or $(PROCMACROLDFLAGS),$(KBUILD_HOSTLDFLAGS)) 514 515# Make variables (CC, etc...) 516CPP = $(CC) -E 517ifneq ($(LLVM),) 518CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 519LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 520AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 521LLVM_LINK = $(LLVM_PREFIX)llvm-link$(LLVM_SUFFIX) 522NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 523OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 524OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 525READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 526STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 527else 528CC = $(CROSS_COMPILE)gcc 529LD = $(CROSS_COMPILE)ld 530AR = $(CROSS_COMPILE)ar 531NM = $(CROSS_COMPILE)nm 532OBJCOPY = $(CROSS_COMPILE)objcopy 533OBJDUMP = $(CROSS_COMPILE)objdump 534READELF = $(CROSS_COMPILE)readelf 535STRIP = $(CROSS_COMPILE)strip 536endif 537RUSTC = rustc 538RUSTDOC = rustdoc 539RUSTFMT = rustfmt 540CLIPPY_DRIVER = clippy-driver 541BINDGEN = bindgen 542PAHOLE = pahole 543RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 544LEX = flex 545YACC = bison 546AWK = awk 547INSTALLKERNEL := installkernel 548PERL = perl 549PYTHON3 = python3 550CHECK = sparse 551BASH = bash 552KGZIP = gzip 553KBZIP2 = bzip2 554KLZOP = lzop 555LZMA = lzma 556LZ4 = lz4 557XZ = xz 558ZSTD = zstd 559TAR = tar 560 561CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 562 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 563NOSTDINC_FLAGS := 564CFLAGS_MODULE = 565RUSTFLAGS_MODULE = 566AFLAGS_MODULE = 567LDFLAGS_MODULE = 568CFLAGS_KERNEL = 569RUSTFLAGS_KERNEL = 570AFLAGS_KERNEL = 571LDFLAGS_vmlinux = 572 573# Use USERINCLUDE when you must reference the UAPI directories only. 574USERINCLUDE := \ 575 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 576 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 577 -I$(srctree)/include/uapi \ 578 -I$(objtree)/include/generated/uapi \ 579 -include $(srctree)/include/linux/compiler-version.h \ 580 -include $(srctree)/include/linux/kconfig.h 581 582# Use LINUXINCLUDE when you must reference the include/ directory. 583# Needed to be compatible with the O= option 584LINUXINCLUDE := \ 585 -I$(srctree)/arch/$(SRCARCH)/include \ 586 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 587 -I$(srctree)/include \ 588 -I$(objtree)/include \ 589 $(USERINCLUDE) 590 591KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 592 593KBUILD_CFLAGS := 594KBUILD_CFLAGS += -fshort-wchar 595KBUILD_CFLAGS += -funsigned-char 596KBUILD_CFLAGS += -fno-common 597KBUILD_CFLAGS += -fno-PIE 598KBUILD_CFLAGS += -fno-strict-aliasing 599 600KBUILD_CPPFLAGS := -D__KERNEL__ 601KBUILD_RUSTFLAGS := $(rust_common_flags) \ 602 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 603 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 604 -Csymbol-mangling-version=v0 \ 605 -Crelocation-model=static \ 606 -Zfunction-sections=n \ 607 -Wclippy::float_arithmetic 608 609KBUILD_AFLAGS_KERNEL := 610KBUILD_CFLAGS_KERNEL := 611KBUILD_RUSTFLAGS_KERNEL := 612KBUILD_AFLAGS_MODULE := -DMODULE 613KBUILD_CFLAGS_MODULE := -DMODULE 614KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 615KBUILD_LDFLAGS_MODULE := 616KBUILD_LDFLAGS := 617CLANG_FLAGS := 618 619ifeq ($(KBUILD_CLIPPY),1) 620 RUSTC_OR_CLIPPY_QUIET := CLIPPY 621 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 622else 623 RUSTC_OR_CLIPPY_QUIET := RUSTC 624 RUSTC_OR_CLIPPY = $(RUSTC) 625endif 626 627# Allows the usage of unstable features in stable compilers. 628export RUSTC_BOOTSTRAP := 1 629 630# Allows finding `.clippy.toml` in out-of-srctree builds. 631export CLIPPY_CONF_DIR := $(srctree) 632 633export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 634export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN LLVM_LINK 635export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 636export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 637export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 638export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD TAR 639export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS KBUILD_PROCMACROLDFLAGS LDFLAGS_MODULE 640export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 641 642export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 643export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 644export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 645export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 646export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 647export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 648 649# Files to ignore in find ... statements 650 651export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 652 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 653 -prune -o 654 655# =========================================================================== 656# Rules shared between *config targets and build targets 657 658# Basic helpers built in scripts/basic/ 659PHONY += scripts_basic 660scripts_basic: 661 $(Q)$(MAKE) $(build)=scripts/basic 662 663PHONY += outputmakefile 664ifdef building_out_of_srctree 665# Before starting out-of-tree build, make sure the source tree is clean. 666# outputmakefile generates a Makefile in the output directory, if using a 667# separate output directory. This allows convenient use of make in the 668# output directory. 669# At the same time when output Makefile generated, generate .gitignore to 670# ignore whole output directory 671 672ifdef KBUILD_EXTMOD 673print_env_for_makefile = \ 674 echo "export KBUILD_OUTPUT = $(objtree)"; \ 675 echo "export KBUILD_EXTMOD = $(realpath $(srcroot))" ; \ 676 echo "export KBUILD_EXTMOD_OUTPUT = $(CURDIR)" 677else 678print_env_for_makefile = \ 679 echo "export KBUILD_OUTPUT = $(CURDIR)" 680endif 681 682filechk_makefile = { \ 683 echo "\# Automatically generated by $(abs_srctree)/Makefile: don't edit"; \ 684 $(print_env_for_makefile); \ 685 echo "include $(abs_srctree)/Makefile"; \ 686 } 687 688$(objtree)/Makefile: FORCE 689 $(call filechk,makefile) 690 691# Prevent $(srcroot)/Makefile from inhibiting the rule to run. 692PHONY += $(objtree)/Makefile 693 694outputmakefile: $(objtree)/Makefile 695ifeq ($(KBUILD_EXTMOD),) 696 @if [ -f $(srctree)/.config -o \ 697 -d $(srctree)/include/config -o \ 698 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 699 echo >&2 "***"; \ 700 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 701 echo >&2 "*** in $(abs_srctree)";\ 702 echo >&2 "***"; \ 703 false; \ 704 fi 705else 706 @if [ -f $(srcroot)/modules.order ]; then \ 707 echo >&2 "***"; \ 708 echo >&2 "*** The external module source tree is not clean."; \ 709 echo >&2 "*** Please run 'make -C $(abs_srctree) M=$(realpath $(srcroot)) clean'"; \ 710 echo >&2 "***"; \ 711 false; \ 712 fi 713endif 714 $(Q)ln -fsn $(srcroot) source 715 $(Q)test -e .gitignore || \ 716 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 717endif 718 719# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 720# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 721# CC_VERSION_TEXT, RUSTC_VERSION_TEXT and PAHOLE_VERSION are referenced from 722# Kconfig (so they need export), and from include/config/auto.conf.cmd to 723# detect the version changes between builds. 724CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 725RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null)) 726PAHOLE_VERSION = $(shell $(srctree)/scripts/pahole-version.sh $(PAHOLE)) 727 728ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 729include $(srctree)/scripts/Makefile.clang 730endif 731 732# Include this also for config targets because some architectures need 733# cc-cross-prefix to determine CROSS_COMPILE. 734ifdef need-compiler 735include $(srctree)/scripts/Makefile.compiler 736endif 737 738ifdef config-build 739# =========================================================================== 740# *config targets only - make sure prerequisites are updated, and descend 741# in scripts/kconfig to make the *config target 742 743# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 744# KBUILD_DEFCONFIG may point out an alternative default configuration 745# used for 'make defconfig' 746include $(srctree)/arch/$(SRCARCH)/Makefile 747export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT RUSTC_VERSION_TEXT PAHOLE_VERSION 748 749config: outputmakefile scripts_basic FORCE 750 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 751 752%config: outputmakefile scripts_basic FORCE 753 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 754 755else #!config-build 756# =========================================================================== 757# Build targets only - this includes vmlinux, arch-specific targets, clean 758# targets and others. In general all targets except *config targets. 759 760# If building an external module we do not care about the all: rule 761# but instead __all depend on modules 762PHONY += all 763ifeq ($(KBUILD_EXTMOD),) 764__all: all 765else 766__all: modules 767endif 768 769targets := 770 771# Decide whether to build built-in, modular, or both. 772# Normally, just do built-in. 773 774KBUILD_MODULES := 775KBUILD_BUILTIN := y 776 777# If we have only "make modules", don't compile built-in objects. 778ifeq ($(MAKECMDGOALS),modules) 779 KBUILD_BUILTIN := 780endif 781 782# If we have "make <whatever> modules", compile modules 783# in addition to whatever we do anyway. 784# Just "make" or "make all" shall build modules as well 785 786ifneq ($(filter all modules nsdeps compile_commands.json clang-%,$(MAKECMDGOALS)),) 787 KBUILD_MODULES := y 788endif 789 790ifeq ($(MAKECMDGOALS),) 791 KBUILD_MODULES := y 792endif 793 794export KBUILD_MODULES KBUILD_BUILTIN 795 796ifdef need-config 797include $(objtree)/include/config/auto.conf 798endif 799 800CC_FLAGS_DIALECT := -std=gnu11 801# Allow including a tagged struct or union anonymously in another struct/union. 802CC_FLAGS_DIALECT += $(CONFIG_CC_MS_EXTENSIONS) 803# Clang enables warnings about GNU and Microsoft extensions by default, disable 804# them because this is expected with the above options. 805ifdef CONFIG_CC_IS_CLANG 806CC_FLAGS_DIALECT += -Wno-gnu 807CC_FLAGS_DIALECT += -Wno-microsoft-anon-tag 808endif 809export CC_FLAGS_DIALECT 810KBUILD_CFLAGS += $(CC_FLAGS_DIALECT) 811 812ifeq ($(KBUILD_EXTMOD),) 813# Objects we will link into vmlinux / subdirs we need to visit 814core-y := 815drivers-y := 816libs-y := lib/ 817endif # KBUILD_EXTMOD 818 819# The all: target is the default when no target is given on the 820# command line. 821# This allow a user to issue only 'make' to build a kernel including modules 822# Defaults to vmlinux, but the arch makefile usually adds further targets 823all: vmlinux 824 825CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 826ifdef CONFIG_CC_IS_GCC 827CFLAGS_GCOV += -fno-tree-loop-im 828endif 829export CFLAGS_GCOV 830 831# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 832ifdef CONFIG_FUNCTION_TRACER 833 CC_FLAGS_FTRACE := -pg 834endif 835 836ifdef CONFIG_TRACEPOINTS 837# To check for unused tracepoints (tracepoints that are defined but never 838# called), run with: 839# 840# make UT=1 841# 842# Each unused tracepoints can take up to 5KB of memory in the running kernel. 843# It is best to remove any that are not used. 844# 845# This command line option will be removed when all current unused 846# tracepoints are removed. 847 848ifeq ("$(origin UT)", "command line") 849 WARN_ON_UNUSED_TRACEPOINTS := $(UT) 850endif 851endif # CONFIG_TRACEPOINTS 852 853export WARN_ON_UNUSED_TRACEPOINTS 854 855# Per-version Rust flags. These are like `rust_common_flags`, but may 856# depend on the Rust compiler version (e.g. using `rustc-min-version`). 857# 858# `-Aclippy::precedence`: the lint was extended in Rust 1.85.0 to 859# include bitmasking and shift operations. However, because it generated 860# many hits, in Rust 1.86.0 it was split into a new `precedence_bits` 861# lint which is not enabled by default. 862rust_common_flags_per_version := \ 863 $(if $(call rustc-min-version,108600),,-Aclippy::precedence) 864 865rust_common_flags += $(rust_common_flags_per_version) 866KBUILD_HOSTRUSTFLAGS += $(rust_common_flags_per_version) $(HOSTRUSTFLAGS) 867KBUILD_RUSTFLAGS += $(rust_common_flags_per_version) 868 869include $(srctree)/arch/$(SRCARCH)/Makefile 870 871ifdef need-config 872ifdef may-sync-config 873# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 874# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 875# because some architectures define CROSS_COMPILE there. 876include include/config/auto.conf.cmd 877 878$(KCONFIG_CONFIG): 879 @echo >&2 '***' 880 @echo >&2 '*** Configuration file "$@" not found!' 881 @echo >&2 '***' 882 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 883 @echo >&2 '*** "make menuconfig" or "make xconfig").' 884 @echo >&2 '***' 885 @/bin/false 886 887# The actual configuration files used during the build are stored in 888# include/generated/ and include/config/. Update them if .config is newer than 889# include/config/auto.conf (which mirrors .config). 890# 891# This exploits the 'multi-target pattern rule' trick. 892# The syncconfig should be executed only once to make all the targets. 893# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 894# 895# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 896# so you cannot notice that Kconfig is waiting for the user input. 897%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 898 $(Q)$(kecho) " SYNC $@" 899 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 900else # !may-sync-config 901# External modules and some install targets need include/generated/autoconf.h 902# and include/config/auto.conf but do not care if they are up-to-date. 903# Use auto.conf to show the error message 904 905checked-configs := $(addprefix $(objtree)/, include/generated/autoconf.h include/generated/rustc_cfg include/config/auto.conf) 906missing-configs := $(filter-out $(wildcard $(checked-configs)), $(checked-configs)) 907 908ifdef missing-configs 909PHONY += $(objtree)/include/config/auto.conf 910 911$(objtree)/include/config/auto.conf: 912 @echo >&2 '***' 913 @echo >&2 '*** ERROR: Kernel configuration is invalid. The following files are missing:' 914 @printf >&2 '*** - %s\n' $(missing-configs) 915 @echo >&2 '*** Run "make oldconfig && make prepare" on kernel source to fix it.' 916 @echo >&2 '***' 917 @/bin/false 918endif 919 920endif # may-sync-config 921endif # need-config 922 923KBUILD_CFLAGS += -fno-delete-null-pointer-checks 924 925ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 926KBUILD_CFLAGS += -O2 927KBUILD_RUSTFLAGS += -Copt-level=2 928else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 929KBUILD_CFLAGS += -Os 930KBUILD_RUSTFLAGS += -Copt-level=s 931endif 932 933# Always set `debug-assertions` and `overflow-checks` because their default 934# depends on `opt-level` and `debug-assertions`, respectively. 935KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 936KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 937 938# Tell gcc to never replace conditional load with a non-conditional one 939ifdef CONFIG_CC_IS_GCC 940# gcc-10 renamed --param=allow-store-data-races=0 to 941# -fno-allow-store-data-races. 942KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 943KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 944endif 945 946ifdef CONFIG_READABLE_ASM 947# Disable optimizations that make assembler listings hard to read. 948# reorder blocks reorders the control in the function 949# ipa clone creates specialized cloned functions 950# partial inlining inlines only parts of functions 951KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 952endif 953 954stackp-flags-y := -fno-stack-protector 955stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 956stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 957 958KBUILD_CFLAGS += $(stackp-flags-y) 959 960ifdef CONFIG_FRAME_POINTER 961KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 962KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 963else 964# Some targets (ARM with Thumb2, for example), can't be built with frame 965# pointers. For those, we don't have FUNCTION_TRACER automatically 966# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 967# incompatible with -fomit-frame-pointer with current GCC, so we don't use 968# -fomit-frame-pointer with FUNCTION_TRACER. 969# In the Rust target specification, "frame-pointer" is set explicitly 970# to "may-omit". 971ifndef CONFIG_FUNCTION_TRACER 972KBUILD_CFLAGS += -fomit-frame-pointer 973endif 974endif 975 976# Initialize all stack variables with a 0xAA pattern. 977ifdef CONFIG_INIT_STACK_ALL_PATTERN 978KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 979endif 980 981# Initialize all stack variables with a zero value. 982ifdef CONFIG_INIT_STACK_ALL_ZERO 983KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 984ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 985# https://github.com/llvm/llvm-project/issues/44842 986CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 987export CC_AUTO_VAR_INIT_ZERO_ENABLER 988KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 989endif 990endif 991 992ifdef CONFIG_CC_IS_CLANG 993ifdef CONFIG_CC_HAS_COUNTED_BY_PTR 994KBUILD_CFLAGS += -fexperimental-late-parse-attributes 995endif 996endif 997 998# Explicitly clear padding bits during variable initialization 999KBUILD_CFLAGS += $(call cc-option,-fzero-init-padding-bits=all) 1000 1001# While VLAs have been removed, GCC produces unreachable stack probes 1002# for the randomize_kstack_offset feature. Disable it for all compilers. 1003KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 1004 1005# Get details on warnings generated due to GCC value tracking. 1006KBUILD_CFLAGS += $(call cc-option, -fdiagnostics-show-context=2) 1007 1008# Show inlining notes for __attribute__((warning/error)) call chains. 1009# GCC supports this unconditionally while Clang 23+ provides a flag. 1010KBUILD_CFLAGS += $(call cc-option, -fdiagnostics-show-inlining-chain) 1011 1012# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 1013ifdef CONFIG_ZERO_CALL_USED_REGS 1014KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 1015endif 1016 1017ifdef CONFIG_FUNCTION_TRACER 1018ifdef CONFIG_FTRACE_MCOUNT_USE_CC 1019 CC_FLAGS_FTRACE += -mrecord-mcount 1020 ifdef CONFIG_HAVE_NOP_MCOUNT 1021 ifeq ($(call cc-option-yn, -mnop-mcount),y) 1022 CC_FLAGS_FTRACE += -mnop-mcount 1023 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 1024 endif 1025 endif 1026endif 1027ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 1028 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 1029 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 1030 endif 1031endif 1032ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 1033 ifdef CONFIG_HAVE_C_RECORDMCOUNT 1034 BUILD_C_RECORDMCOUNT := y 1035 export BUILD_C_RECORDMCOUNT 1036 endif 1037endif 1038ifdef CONFIG_HAVE_FENTRY 1039 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 1040 ifeq ($(call cc-option-yn, -mfentry),y) 1041 CC_FLAGS_FTRACE += -mfentry 1042 CC_FLAGS_USING += -DCC_USING_FENTRY 1043 endif 1044endif 1045export CC_FLAGS_FTRACE 1046KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 1047KBUILD_AFLAGS += $(CC_FLAGS_USING) 1048endif 1049 1050# We trigger additional mismatches with less inlining 1051ifdef CONFIG_DEBUG_SECTION_MISMATCH 1052KBUILD_CFLAGS += -fno-inline-functions-called-once 1053endif 1054 1055# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 1056ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 1057KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 1058KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 1059LDFLAGS_vmlinux += --gc-sections 1060endif 1061 1062ifdef CONFIG_SHADOW_CALL_STACK 1063ifndef CONFIG_DYNAMIC_SCS 1064CC_FLAGS_SCS := -fsanitize=shadow-call-stack 1065KBUILD_CFLAGS += $(CC_FLAGS_SCS) 1066KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack 1067endif 1068export CC_FLAGS_SCS 1069endif 1070 1071ifdef CONFIG_LTO_CLANG 1072ifdef CONFIG_LTO_CLANG_THIN 1073CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 1074KBUILD_LDFLAGS += $(call ld-option,--lto-whole-program-visibility -mllvm -always-rename-promoted-locals=false) 1075else 1076CC_FLAGS_LTO := -flto 1077endif 1078CC_FLAGS_LTO += -fvisibility=hidden 1079 1080# Limit inlining across translation units to reduce binary size 1081KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 1082endif 1083 1084ifdef CONFIG_LTO 1085KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 1086KBUILD_AFLAGS += -fno-lto 1087export CC_FLAGS_LTO 1088endif 1089 1090ifdef CONFIG_CFI 1091CC_FLAGS_CFI := -fsanitize=kcfi 1092ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS 1093 CC_FLAGS_CFI += -fsanitize-cfi-icall-experimental-normalize-integers 1094endif 1095ifdef CONFIG_FINEIBT_BHI 1096 CC_FLAGS_CFI += -fsanitize-kcfi-arity 1097endif 1098ifdef CONFIG_RUST 1099 # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects 1100 # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS. 1101 RUSTC_FLAGS_CFI := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers 1102 KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI) 1103 export RUSTC_FLAGS_CFI 1104endif 1105KBUILD_CFLAGS += $(CC_FLAGS_CFI) 1106export CC_FLAGS_CFI 1107endif 1108 1109# Architectures can define flags to add/remove for floating-point support 1110CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT 1111export CC_FLAGS_FPU 1112export CC_FLAGS_NO_FPU 1113 1114ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 1115# Set the minimal function alignment. Use the newer GCC option 1116# -fmin-function-alignment if it is available, or fall back to -falign-funtions. 1117# See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. 1118ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT 1119KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) 1120else 1121KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 1122endif 1123endif 1124 1125# arch Makefile may override CC so keep this after arch Makefile is included 1126NOSTDINC_FLAGS += -nostdinc 1127 1128# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 1129# the kernel uses only C99 flexible arrays for dynamically sized trailing 1130# arrays. Enforce this for everything that may examine structure sizes and 1131# perform bounds checking. 1132KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 1133 1134# disable invalid "can't wrap" optimizations for signed / pointers 1135KBUILD_CFLAGS += -fno-strict-overflow 1136 1137# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1138KBUILD_CFLAGS += -fno-stack-check 1139 1140# conserve stack if available 1141ifdef CONFIG_CC_IS_GCC 1142KBUILD_CFLAGS += -fconserve-stack 1143endif 1144 1145# Ensure compilers do not transform certain loops into calls to wcslen() 1146KBUILD_CFLAGS += -fno-builtin-wcslen 1147 1148# change __FILE__ to the relative path to the source directory 1149ifdef building_out_of_srctree 1150KBUILD_CPPFLAGS += -fmacro-prefix-map=$(srcroot)/= 1151ifeq ($(call rustc-option-yn, --remap-path-scope=macro),y) 1152KBUILD_RUSTFLAGS += --remap-path-prefix=$(srcroot)/= --remap-path-scope=macro 1153endif 1154endif 1155 1156# include additional Makefiles when needed 1157include-y := scripts/Makefile.warn 1158include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1159include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1160include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1161include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1162include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1163include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1164include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1165include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1166include-$(CONFIG_KSTACK_ERASE) += scripts/Makefile.kstack_erase 1167include-$(CONFIG_AUTOFDO_CLANG) += scripts/Makefile.autofdo 1168include-$(CONFIG_PROPELLER_CLANG) += scripts/Makefile.propeller 1169include-$(CONFIG_WARN_CONTEXT_ANALYSIS) += scripts/Makefile.context-analysis 1170include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1171 1172include $(addprefix $(srctree)/, $(include-y)) 1173 1174# scripts/Makefile.gcc-plugins is intentionally included last. 1175# Do not add $(call cc-option,...) below this line. When you build the kernel 1176# from the clean source tree, the GCC plugins do not exist at this point. 1177 1178# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1179KBUILD_CPPFLAGS += $(KCPPFLAGS) 1180KBUILD_AFLAGS += $(KAFLAGS) 1181KBUILD_CFLAGS += $(KCFLAGS) 1182KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1183 1184KBUILD_LDFLAGS_MODULE += --build-id=sha1 1185LDFLAGS_vmlinux += --build-id=sha1 1186 1187KBUILD_LDFLAGS += -z noexecstack 1188ifeq ($(CONFIG_LD_IS_BFD),y) 1189KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1190endif 1191 1192ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1193LDFLAGS_vmlinux += -X 1194endif 1195 1196ifeq ($(CONFIG_RELR),y) 1197# ld.lld before 15 did not support -z pack-relative-relocs. 1198LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1199endif 1200 1201# We never want expected sections to be placed heuristically by the 1202# linker. All sections should be explicitly named in the linker script. 1203ifdef CONFIG_LD_ORPHAN_WARN 1204LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1205endif 1206 1207ifneq ($(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS),) 1208LDFLAGS_vmlinux += --emit-relocs --discard-none 1209endif 1210 1211# Align the architecture of userspace programs with the kernel 1212USERFLAGS_FROM_KERNEL := --target=% 1213 1214ifdef CONFIG_ARCH_USERFLAGS 1215KBUILD_USERCFLAGS += $(CONFIG_ARCH_USERFLAGS) 1216KBUILD_USERLDFLAGS += $(CONFIG_ARCH_USERFLAGS) 1217else 1218# If not overridden also inherit the bit size 1219USERFLAGS_FROM_KERNEL += -m32 -m64 1220endif 1221 1222KBUILD_USERCFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1223KBUILD_USERLDFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1224 1225# userspace programs are linked via the compiler, use the correct linker 1226ifdef CONFIG_CC_IS_CLANG 1227KBUILD_USERLDFLAGS += --ld-path=$(LD) 1228endif 1229 1230# make the checker run with the right architecture 1231CHECKFLAGS += --arch=$(ARCH) 1232 1233# insure the checker run with the right endianness 1234CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1235 1236# the checker needs the correct machine size 1237CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1238 1239# Validate the checker is available and functional 1240ifneq ($(KBUILD_CHECKSRC), 0) 1241 ifneq ($(shell $(srctree)/scripts/checker-valid.sh $(CHECK) $(CHECKFLAGS)), 1) 1242 $(warning C=$(KBUILD_CHECKSRC) specified, but $(CHECK) is not available or not up to date) 1243 KBUILD_CHECKSRC = 0 1244 endif 1245endif 1246 1247# Default kernel image to build when no specific target is given. 1248# KBUILD_IMAGE may be overruled on the command line or 1249# set in the environment 1250# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1251# this default value 1252export KBUILD_IMAGE ?= vmlinux 1253 1254# 1255# INSTALL_PATH specifies where to place the updated kernel and system map 1256# images. Default is /boot, but you can set it to other values 1257export INSTALL_PATH ?= /boot 1258 1259# 1260# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1261# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1262# an argument if needed. Otherwise it defaults to the kernel install path 1263# 1264export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1265 1266# 1267# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1268# relocations required by build roots. This is not defined in the 1269# makefile but the argument can be passed to make if needed. 1270# 1271 1272MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1273export MODLIB 1274 1275PHONY += prepare0 1276 1277ifeq ($(KBUILD_EXTMOD),) 1278 1279build-dir := . 1280clean-dirs := $(sort . Documentation \ 1281 $(patsubst %/,%,$(filter %/, $(core-) \ 1282 $(drivers-) $(libs-)))) 1283 1284export ARCH_CORE := $(core-y) 1285export ARCH_LIB := $(filter %/, $(libs-y)) 1286export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1287# Externally visible symbols (used by link-vmlinux.sh) 1288 1289KBUILD_VMLINUX_OBJS := built-in.a $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1290KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1291 1292export KBUILD_VMLINUX_LIBS 1293export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1294 1295ifdef CONFIG_TRIM_UNUSED_KSYMS 1296# For the kernel to actually contain only the needed exported symbols, 1297# we have to build modules as well to determine what those symbols are. 1298KBUILD_MODULES := y 1299endif 1300 1301# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1302quiet_cmd_ar_vmlinux.a = AR $@ 1303 cmd_ar_vmlinux.a = \ 1304 rm -f $@; \ 1305 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1306 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1307 1308targets += vmlinux.a 1309vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1310 $(call if_changed,ar_vmlinux.a) 1311 1312PHONY += vmlinux_o 1313vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1314 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1315 1316vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1317 @: 1318 1319PHONY += vmlinux 1320# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1321# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1322# unrelated; the decompressors just happen to have the same base name, 1323# arch/*/boot/compressed/vmlinux. 1324# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1325# 1326# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1327# https://savannah.gnu.org/bugs/?61463 1328# For Make > 4.4, the following simple code will work: 1329# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1330vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1331vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1332vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1333 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1334 1335# The actual objects are generated when descending, 1336# make sure no implicit rule kicks in 1337$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1338 1339ifeq ($(origin KERNELRELEASE),file) 1340filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1341else 1342filechk_kernel.release = echo $(KERNELRELEASE) 1343endif 1344 1345# Store (new) KERNELRELEASE string in include/config/kernel.release 1346include/config/kernel.release: FORCE 1347 $(call filechk,kernel.release) 1348 1349# Additional helpers built in scripts/ 1350# Carefully list dependencies so we do not try to build scripts twice 1351# in parallel 1352PHONY += scripts 1353scripts: scripts_basic scripts_dtc 1354 $(Q)$(MAKE) $(build)=$(@) 1355 1356# Things we need to do before we recursively start building the kernel 1357# or the modules are listed in "prepare". 1358# A multi level approach is used. prepareN is processed before prepareN-1. 1359# archprepare is used in arch Makefiles and when processed asm symlink, 1360# version.h and scripts_basic is processed / created. 1361 1362PHONY += prepare archprepare 1363 1364archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1365 asm-generic $(version_h) include/generated/utsrelease.h \ 1366 include/generated/compile.h include/generated/autoconf.h \ 1367 include/generated/rustc_cfg remove-stale-files 1368 1369prepare0: archprepare 1370 $(Q)$(MAKE) $(build)=scripts/mod 1371 $(Q)$(MAKE) $(build)=. prepare 1372 1373# All the preparing.. 1374prepare: prepare0 1375ifdef CONFIG_RUST 1376 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1377 $(Q)$(MAKE) $(build)=rust 1378endif 1379 1380PHONY += remove-stale-files 1381remove-stale-files: 1382 $(Q)$(srctree)/scripts/remove-stale-files 1383 1384# Support for using generic headers in asm-generic 1385asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj 1386 1387PHONY += asm-generic uapi-asm-generic 1388asm-generic: uapi-asm-generic 1389 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1390 generic=include/asm-generic 1391uapi-asm-generic: 1392 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1393 generic=include/uapi/asm-generic 1394 1395# Generate some files 1396# --------------------------------------------------------------------------- 1397 1398# KERNELRELEASE can change from a few different places, meaning version.h 1399# needs to be updated, so this check is forced on all builds 1400 1401uts_len := 64 1402define filechk_utsrelease.h 1403 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1404 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1405 exit 1; \ 1406 fi; \ 1407 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1408endef 1409 1410define filechk_version.h 1411 if [ $(SUBLEVEL) -gt 255 ]; then \ 1412 echo \#define LINUX_VERSION_CODE $(shell \ 1413 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1414 else \ 1415 echo \#define LINUX_VERSION_CODE $(shell \ 1416 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1417 fi; \ 1418 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1419 ((c) > 255 ? 255 : (c)))'; \ 1420 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1421 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1422 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1423endef 1424 1425$(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1426$(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0) 1427$(version_h): FORCE 1428 $(call filechk,version.h) 1429 1430include/generated/utsrelease.h: include/config/kernel.release FORCE 1431 $(call filechk,utsrelease.h) 1432 1433filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1434 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1435 1436include/generated/compile.h: FORCE 1437 $(call filechk,compile.h) 1438 1439PHONY += headerdep 1440headerdep: 1441 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1442 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1443 1444# --------------------------------------------------------------------------- 1445# Kernel headers 1446 1447#Default location for installed headers 1448export INSTALL_HDR_PATH = $(objtree)/usr 1449 1450quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1451 cmd_headers_install = \ 1452 mkdir -p $(INSTALL_HDR_PATH); \ 1453 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1454 usr/include $(INSTALL_HDR_PATH) 1455 1456PHONY += headers_install 1457headers_install: headers 1458 $(call cmd,headers_install) 1459 1460PHONY += archheaders archscripts 1461 1462hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1463 1464PHONY += headers 1465headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders 1466ifdef HEADER_ARCH 1467 $(Q)$(MAKE) -f $(srctree)/Makefile HEADER_ARCH= SRCARCH=$(HEADER_ARCH) headers 1468else 1469 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1470 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1471endif 1472 1473ifdef CONFIG_HEADERS_INSTALL 1474prepare: headers 1475endif 1476 1477PHONY += usr_gen_init_cpio 1478usr_gen_init_cpio: scripts_basic 1479 $(Q)$(MAKE) $(build)=usr usr/gen_init_cpio 1480 1481PHONY += scripts_unifdef 1482scripts_unifdef: scripts_basic 1483 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1484 1485PHONY += scripts_gen_packed_field_checks 1486scripts_gen_packed_field_checks: scripts_basic 1487 $(Q)$(MAKE) $(build)=scripts scripts/gen_packed_field_checks 1488 1489# --------------------------------------------------------------------------- 1490# Install 1491 1492# Many distributions have the custom install script, /sbin/installkernel. 1493# If DKMS is installed, 'make install' will eventually recurse back 1494# to this Makefile to build and install external modules. 1495# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1496 1497quiet_cmd_install = INSTALL $(INSTALL_PATH) 1498 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1499 1500# --------------------------------------------------------------------------- 1501# vDSO install 1502 1503PHONY += vdso_install 1504vdso_install: export INSTALL_FILES = $(vdso-install-y) 1505vdso_install: 1506 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1507 1508# --------------------------------------------------------------------------- 1509# Tools 1510 1511ifdef CONFIG_OBJTOOL 1512prepare: tools/objtool 1513endif 1514 1515ifdef CONFIG_BPF 1516ifdef CONFIG_DEBUG_INFO_BTF 1517prepare: tools/bpf/resolve_btfids 1518endif 1519endif 1520 1521# The tools build system is not a part of Kbuild and tends to introduce 1522# its own unique issues. If you need to integrate a new tool into Kbuild, 1523# please consider locating that tool outside the tools/ tree and using the 1524# standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry 1525# here. See Documentation/kbuild/makefiles.rst for details. 1526 1527PHONY += resolve_btfids_clean 1528 1529resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1530 1531# tools/bpf/resolve_btfids directory might not exist 1532# in output directory, skip its clean in that case 1533resolve_btfids_clean: 1534ifneq ($(wildcard $(resolve_btfids_O)),) 1535 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1536endif 1537 1538PHONY += objtool_clean objtool_mrproper 1539 1540objtool_O = $(abspath $(objtree))/tools/objtool 1541 1542objtool_clean objtool_mrproper: 1543ifneq ($(wildcard $(objtool_O)),) 1544 $(Q)$(MAKE) -sC $(abs_srctree)/tools/objtool O=$(objtool_O) srctree=$(abs_srctree) $(patsubst objtool_%,%,$@) 1545endif 1546 1547tools/: FORCE 1548 $(Q)mkdir -p $(objtree)/tools 1549 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1550 1551tools/%: FORCE 1552 $(Q)mkdir -p $(objtree)/tools 1553 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1554 1555# --------------------------------------------------------------------------- 1556# Kernel selftest 1557 1558PHONY += kselftest 1559kselftest: headers 1560 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1561 1562kselftest-%: headers FORCE 1563 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1564 1565PHONY += kselftest-merge 1566kselftest-merge: 1567 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1568 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1569 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1570 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1571 1572# --------------------------------------------------------------------------- 1573# Devicetree files 1574 1575ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1576dtstree := arch/$(SRCARCH)/boot/dts 1577endif 1578 1579dtbindingtree := Documentation/devicetree/bindings 1580 1581%.yaml: dtbs_prepare 1582 $(Q)$(MAKE) $(build)=$(dtbindingtree) \ 1583 $(dtbindingtree)/$(patsubst %.yaml,%.example.dtb,$@) dt_binding_check_one 1584 1585ifneq ($(dtstree),) 1586 1587%.dtb: dtbs_prepare 1588 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1589 1590%.dtbo: dtbs_prepare 1591 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1592 1593PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1594dtbs: dtbs_prepare 1595 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1 1596 1597# include/config/kernel.release is actually needed when installing DTBs because 1598# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1599# dtbs_install depend on it as dtbs_install may run as root. 1600dtbs_prepare: include/config/kernel.release scripts_dtc 1601 1602ifneq ($(filter dtbs_check %.yaml, $(MAKECMDGOALS)),) 1603export CHECK_DTBS=y 1604endif 1605 1606ifneq ($(CHECK_DTBS),) 1607dtbs_prepare: dt_binding_schemas 1608endif 1609 1610dtbs_check: dtbs 1611 1612dtbs_install: 1613 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) 1614 1615ifdef CONFIG_OF_EARLY_FLATTREE 1616all: dtbs 1617endif 1618 1619ifdef CONFIG_GENERIC_BUILTIN_DTB 1620vmlinux: dtbs 1621endif 1622 1623endif 1624 1625PHONY += scripts_dtc 1626scripts_dtc: scripts_basic 1627 $(Q)$(MAKE) $(build)=scripts/dtc 1628 1629ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1630export CHECK_DTBS=y 1631endif 1632 1633PHONY += dt_binding_check dt_binding_schemas 1634dt_binding_check: dt_binding_schemas scripts_dtc 1635 $(Q)$(MAKE) $(build)=$(dtbindingtree) $@ 1636 1637dt_binding_schemas: 1638 $(Q)$(MAKE) $(build)=$(dtbindingtree) 1639 1640PHONY += dt_compatible_check 1641dt_compatible_check: dt_binding_schemas 1642 $(Q)$(MAKE) $(build)=$(dtbindingtree) $@ 1643 1644# --------------------------------------------------------------------------- 1645# Modules 1646 1647ifdef CONFIG_MODULES 1648 1649# By default, build modules as well 1650 1651all: modules 1652 1653# When we're building modules with modversions, we need to consider 1654# the built-in objects during the descend as well, in order to 1655# make sure the checksums are up to date before we record them. 1656ifdef CONFIG_MODVERSIONS 1657 KBUILD_BUILTIN := y 1658endif 1659 1660# Build modules 1661# 1662 1663# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1664# is an exception. 1665ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1666KBUILD_BUILTIN := y 1667modules: vmlinux 1668endif 1669 1670modules: modules_prepare 1671 1672# Target to prepare building external modules 1673modules_prepare: prepare 1674 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1675 1676endif # CONFIG_MODULES 1677 1678### 1679# Cleaning is done on three levels. 1680# make clean Delete most generated files 1681# Leave enough to build external modules 1682# make mrproper Delete the current configuration, and all generated files 1683# make distclean Remove editor backup files, patch leftover files and the like 1684 1685# Directories & files removed with 'make clean' 1686CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1687 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1688 modules.builtin.ranges vmlinux.o.map vmlinux.unstripped \ 1689 compile_commands.json rust/test \ 1690 rust-project.json .vmlinux.objs .vmlinux.export.c \ 1691 .builtin-dtbs-list .builtin-dtbs.S 1692 1693# Directories & files removed with 'make mrproper' 1694MRPROPER_FILES += include/config include/generated \ 1695 arch/$(SRCARCH)/include/generated .objdiff \ 1696 debian snap tar-install PKGBUILD pacman \ 1697 .config .config.old .version \ 1698 Module.symvers \ 1699 certs/signing_key.pem \ 1700 certs/x509.genkey \ 1701 vmlinux-gdb.py \ 1702 rpmbuild \ 1703 rust/libmacros.so rust/libmacros.dylib \ 1704 rust/libpin_init_internal.so rust/libpin_init_internal.dylib 1705 1706# clean - Delete most, but leave enough to build external modules 1707# 1708clean: private rm-files := $(CLEAN_FILES) 1709 1710PHONY += archclean vmlinuxclean 1711 1712vmlinuxclean: 1713 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1714 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1715 1716clean: archclean vmlinuxclean resolve_btfids_clean objtool_clean 1717 1718# mrproper - Delete all generated files, including .config 1719# 1720mrproper: private rm-files := $(MRPROPER_FILES) 1721mrproper-dirs := $(addprefix _mrproper_,scripts) 1722 1723PHONY += $(mrproper-dirs) mrproper 1724$(mrproper-dirs): 1725 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1726 1727mrproper: clean objtool_mrproper $(mrproper-dirs) 1728 $(call cmd,rmfiles) 1729 @find . $(RCS_FIND_IGNORE) \ 1730 \( -name '*.rmeta' \) \ 1731 -type f -print | xargs rm -f 1732 1733# distclean 1734# 1735PHONY += distclean 1736 1737distclean: mrproper 1738 @find . $(RCS_FIND_IGNORE) \ 1739 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1740 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1741 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1742 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1743 -type f -print | xargs rm -f 1744 1745 1746# Packaging of the kernel to various formats 1747# --------------------------------------------------------------------------- 1748 1749modules-cpio-pkg: usr_gen_init_cpio 1750 1751%src-pkg: FORCE 1752 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1753%pkg: include/config/kernel.release FORCE 1754 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1755 1756# Brief documentation of the typical targets used 1757# --------------------------------------------------------------------------- 1758 1759boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1760boards := $(sort $(notdir $(boards))) 1761board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1762board-dirs := $(sort $(notdir $(board-dirs:/=))) 1763 1764PHONY += help 1765help: 1766 @echo 'Cleaning targets:' 1767 @echo ' clean - Remove most generated files but keep the config and' 1768 @echo ' enough build support to build external modules' 1769 @echo ' mrproper - Remove all generated files + config + various backup files' 1770 @echo ' distclean - mrproper + remove editor backup and patch files' 1771 @echo '' 1772 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1773 @echo '' 1774 @echo 'Other generic targets:' 1775 @echo ' all - Build all targets marked with [*]' 1776 @echo '* vmlinux - Build the bare kernel' 1777 @echo '* modules - Build all modules' 1778 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1779 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1780 @echo ' dir/ - Build all files in dir and below' 1781 @echo ' dir/file.[ois] - Build specified target only' 1782 @echo ' dir/file.ll - Build the LLVM assembly file' 1783 @echo ' (requires compiler support for LLVM assembly generation)' 1784 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1785 @echo ' (requires a recent binutils and recent build (System.map))' 1786 @echo ' dir/file.ko - Build module including final link' 1787 @echo ' modules_prepare - Set up for building external modules' 1788 @echo ' tags/TAGS - Generate tags file for editors' 1789 @echo ' cscope - Generate cscope index' 1790 @echo ' gtags - Generate GNU GLOBAL index' 1791 @echo ' kernelrelease - Output the release version string (use with make -s)' 1792 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1793 @echo ' image_name - Output the image name (use with make -s)' 1794 @echo ' headers - Build ready-to-install UAPI headers in usr/include' 1795 @echo ' headers_install - Install sanitised kernel UAPI headers to INSTALL_HDR_PATH'; \ 1796 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1797 echo '' 1798 @echo 'Static analysers:' 1799 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1800 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1801 @echo ' versioncheck - Sanity check on version.h usage' 1802 @echo ' includecheck - Check for duplicate included header files' 1803 @echo ' headerdep - Detect inclusion cycles in headers' 1804 @echo ' coccicheck - Check with Coccinelle' 1805 @echo ' clang-analyzer - Check with clang static analyzer' 1806 @echo ' clang-tidy - Check with clang-tidy' 1807 @echo '' 1808 @echo 'Tools:' 1809 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1810 @echo '' 1811 @echo 'Kernel selftest:' 1812 @echo ' kselftest - Build and run kernel selftest' 1813 @echo ' Build, install, and boot kernel before' 1814 @echo ' running kselftest on it' 1815 @echo ' Run as root for full coverage' 1816 @echo ' kselftest-all - Build kernel selftest' 1817 @echo ' kselftest-install - Build and install kernel selftest' 1818 @echo ' kselftest-clean - Remove all generated kselftest files' 1819 @echo ' kselftest-merge - Merge all the config dependencies of' 1820 @echo ' kselftest to existing .config.' 1821 @echo '' 1822 @echo 'Rust targets:' 1823 @echo ' rustavailable - Checks whether the Rust toolchain is' 1824 @echo ' available and, if not, explains why.' 1825 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1826 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1827 @echo ' is formatted, printing a diff otherwise.' 1828 @echo ' rustdoc - Generate Rust documentation' 1829 @echo ' (requires kernel .config)' 1830 @echo ' rusttest - Runs the Rust tests' 1831 @echo ' (requires kernel .config; downloads external repos)' 1832 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1833 @echo ' (requires kernel .config)' 1834 @echo ' dir/file.[os] - Build specified target only' 1835 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1836 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1837 @echo ' The output is not intended to be compilable.' 1838 @echo ' dir/file.ll - Build the LLVM assembly file' 1839 @echo '' 1840 @$(if $(dtstree), \ 1841 echo 'Devicetree:'; \ 1842 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1843 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1844 echo ' dt_binding_check - Validate device tree binding documents and examples'; \ 1845 echo ' dt_binding_schemas - Build processed device tree binding schemas'; \ 1846 echo ' dtbs_check - Validate device tree source files';\ 1847 echo '') 1848 1849 @echo 'Userspace tools targets:' 1850 @echo ' use "make tools/help"' 1851 @echo ' or "cd tools; make help"' 1852 @echo '' 1853 @echo 'Kernel packaging:' 1854 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1855 @echo '' 1856 @echo 'Documentation targets:' 1857 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1858 @echo '' 1859 @echo 'Architecture-specific targets ($(SRCARCH)):' 1860 @$(or $(archhelp),\ 1861 echo ' No architecture-specific help defined for $(SRCARCH)') 1862 @echo '' 1863 @$(if $(boards), \ 1864 $(foreach b, $(boards), \ 1865 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1866 echo '') 1867 @$(if $(board-dirs), \ 1868 $(foreach b, $(board-dirs), \ 1869 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1870 printf " %-16s - Show all of the above\\n" help-boards; \ 1871 echo '') 1872 1873 @echo ' make V=n [targets] 1: verbose build' 1874 @echo ' 2: give reason for rebuild of target' 1875 @echo ' V=1 and V=2 can be combined with V=12' 1876 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1877 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1878 @echo ' (sparse by default)' 1879 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1880 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1881 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where' 1882 @echo ' 1: warnings which may be relevant and do not occur too often' 1883 @echo ' 2: warnings which occur quite often but may still be relevant' 1884 @echo ' 3: more obscure warnings, can most likely be ignored' 1885 @echo ' c: extra checks in the configuration stage (Kconfig)' 1886 @echo ' e: warnings are being treated as errors' 1887 @echo ' Multiple levels can be combined with W=12 or W=123' 1888 @echo ' make UT=1 [targets] Warn if a tracepoint is defined but not used.' 1889 @echo ' [ This will be removed when all current unused tracepoints are eliminated. ]' 1890 @$(if $(dtstree), \ 1891 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1892 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1893 ) 1894 @echo '' 1895 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1896 @echo 'For further info see the ./README file' 1897 1898 1899help-board-dirs := $(addprefix help-,$(board-dirs)) 1900 1901help-boards: $(help-board-dirs) 1902 1903boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1904 1905$(help-board-dirs): help-%: 1906 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1907 @$(if $(boards-per-dir), \ 1908 $(foreach b, $(boards-per-dir), \ 1909 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1910 echo '') 1911 1912 1913# Documentation targets 1914# --------------------------------------------------------------------------- 1915DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1916 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs mandocs \ 1917 htmldocs-redirects 1918 1919PHONY += $(DOC_TARGETS) 1920$(DOC_TARGETS): 1921 $(Q)$(MAKE) $(build)=Documentation $@ 1922 1923 1924# Rust targets 1925# --------------------------------------------------------------------------- 1926 1927# "Is Rust available?" target 1928PHONY += rustavailable 1929rustavailable: 1930 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1931 1932# Documentation target 1933# 1934# Using the singular to avoid running afoul of `no-dot-config-targets`. 1935PHONY += rustdoc 1936rustdoc: prepare 1937 $(Q)$(MAKE) $(build)=rust $@ 1938 1939# Testing target 1940PHONY += rusttest 1941rusttest: prepare 1942 $(Q)$(MAKE) $(build)=rust $@ 1943 1944# Formatting targets 1945# 1946# Generated files as well as vendored crates are skipped. 1947PHONY += rustfmt rustfmtcheck 1948 1949rustfmt: 1950 $(Q)find $(srctree) $(RCS_FIND_IGNORE) \ 1951 \( \ 1952 -path $(srctree)/rust/proc-macro2 \ 1953 -o -path $(srctree)/rust/quote \ 1954 -o -path $(srctree)/rust/syn \ 1955 \) -prune -o \ 1956 -type f -a -name '*.rs' -a ! -name '*generated*' -print \ 1957 | xargs $(RUSTFMT) $(rustfmt_flags) 1958 1959rustfmtcheck: rustfmt_flags = --check 1960rustfmtcheck: rustfmt 1961 1962# Misc 1963# --------------------------------------------------------------------------- 1964 1965PHONY += misc-check 1966misc-check: 1967 $(Q)$(srctree)/scripts/misc-check 1968 1969all: misc-check 1970 1971PHONY += scripts_gdb 1972scripts_gdb: prepare0 1973 $(Q)$(MAKE) $(build)=scripts/gdb 1974 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1975 1976ifdef CONFIG_GDB_SCRIPTS 1977all: scripts_gdb 1978endif 1979 1980else # KBUILD_EXTMOD 1981 1982filechk_kernel.release = echo $(KERNELRELEASE) 1983 1984### 1985# External module support. 1986# When building external modules the kernel used as basis is considered 1987# read-only, and no consistency checks are made and the make 1988# system is not used on the basis kernel. If updates are required 1989# in the basis kernel ordinary make commands (without M=...) must be used. 1990 1991# We are always building only modules. 1992KBUILD_BUILTIN := 1993KBUILD_MODULES := y 1994 1995build-dir := . 1996 1997clean-dirs := . 1998clean: private rm-files := Module.symvers modules.nsdeps compile_commands.json 1999 2000PHONY += prepare 2001# now expand this into a simple variable to reduce the cost of shell evaluations 2002prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 2003prepare: PAHOLE_VERSION := $(PAHOLE_VERSION) 2004prepare: 2005 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 2006 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 2007 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 2008 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 2009 fi 2010 @if [ "$(PAHOLE_VERSION)" != "$(CONFIG_PAHOLE_VERSION)" ]; then \ 2011 echo >&2 "warning: pahole version differs from the one used to build the kernel"; \ 2012 echo >&2 " The kernel was built with: $(CONFIG_PAHOLE_VERSION)"; \ 2013 echo >&2 " You are using: $(PAHOLE_VERSION)"; \ 2014 fi 2015 2016PHONY += help 2017help: 2018 @echo ' Building external modules.' 2019 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 2020 @echo '' 2021 @echo ' modules - default target, build the module(s)' 2022 @echo ' modules_install - install the module' 2023 @echo ' clean - remove generated files in module directory only' 2024 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 2025 @echo '' 2026 2027ifndef CONFIG_MODULES 2028modules modules_install: __external_modules_error 2029__external_modules_error: 2030 @echo >&2 '***' 2031 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 2032 @echo >&2 '*** You cannot build or install external modules.' 2033 @echo >&2 '***' 2034 @false 2035endif 2036 2037endif # KBUILD_EXTMOD 2038 2039# --------------------------------------------------------------------------- 2040# Modules 2041 2042PHONY += modules modules_install modules_sign modules_prepare 2043 2044modules_install: 2045 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 2046 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 2047 2048ifeq ($(CONFIG_MODULE_SIG),y) 2049# modules_sign is a subset of modules_install. 2050# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 2051modules_sign: modules_install 2052 @: 2053else 2054modules_sign: 2055 @echo >&2 '***' 2056 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 2057 @echo >&2 '***' 2058 @false 2059endif 2060 2061ifdef CONFIG_MODULES 2062 2063modules.order: $(build-dir) 2064 @: 2065 2066# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 2067# This is solely useful to speed up test compiles. 2068modules: modpost 2069ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2070 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2071endif 2072 2073PHONY += modules_check 2074modules_check: modules.order 2075 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 2076 2077else # CONFIG_MODULES 2078 2079modules: 2080 @: 2081 2082KBUILD_MODULES := 2083 2084endif # CONFIG_MODULES 2085 2086PHONY += modpost 2087modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 2088 $(if $(KBUILD_MODULES), modules_check) 2089 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2090 2091# Single targets 2092# --------------------------------------------------------------------------- 2093# To build individual files in subdirectories, you can do like this: 2094# 2095# make foo/bar/baz.s 2096# 2097# The supported suffixes for single-target are listed in 'single-targets' 2098# 2099# To build only under specific subdirectories, you can do like this: 2100# 2101# make foo/bar/baz/ 2102 2103ifdef single-build 2104 2105# .ko is special because modpost is needed 2106single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 2107single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 2108 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 2109 2110$(single-ko): single_modules 2111 @: 2112$(single-no-ko): $(build-dir) 2113 @: 2114 2115# Remove modules.order when done because it is not the real one. 2116PHONY += single_modules 2117single_modules: $(single-no-ko) modules_prepare 2118 $(Q){ $(foreach m, $(single-ko), echo $(m:%.ko=%.o);) } > modules.order 2119 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2120ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2121 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2122endif 2123 $(Q)rm -f modules.order 2124 2125single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 2126 2127KBUILD_MODULES := y 2128 2129endif 2130 2131prepare: outputmakefile 2132 2133# Preset locale variables to speed up the build process. Limit locale 2134# tweaks to this spot to avoid wrong language settings when running 2135# make menuconfig etc. 2136# Error messages still appears in the original language 2137PHONY += $(build-dir) 2138$(build-dir): prepare 2139 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 2140 2141clean-dirs := $(addprefix _clean_, $(clean-dirs)) 2142PHONY += $(clean-dirs) clean 2143$(clean-dirs): 2144 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 2145 2146clean: $(clean-dirs) 2147 $(call cmd,rmfiles) 2148 @find . $(RCS_FIND_IGNORE) \ 2149 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 2150 -o -name '*.ko.*' \ 2151 -o -name '*.dtb' -o -name '*.dtbo' \ 2152 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 2153 -o -name '*.dt.yaml' -o -name 'dtbs-list' \ 2154 -o -name '*.dwo' -o -name '*.lst' \ 2155 -o -name '*.su' -o -name '*.mod' \ 2156 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 2157 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 2158 -o -name '*.asn1.[ch]' \ 2159 -o -name '*.symtypes' -o -name 'modules.order' \ 2160 -o -name '*.c.[012]*.*' \ 2161 -o -name '*.ll' \ 2162 -o -name '*.gcno' \ 2163 \) -type f -print \ 2164 -o -name '.tmp_*' -print \ 2165 | xargs rm -rf 2166 2167# Generate tags for editors 2168# --------------------------------------------------------------------------- 2169quiet_cmd_tags = GEN $@ 2170 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 2171 2172tags TAGS cscope gtags: FORCE 2173 $(call cmd,tags) 2174 2175# Generate rust-project.json (a file that describes the structure of non-Cargo 2176# Rust projects) for rust-analyzer (an implementation of the Language Server 2177# Protocol). 2178PHONY += rust-analyzer 2179rust-analyzer: 2180 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 2181ifdef KBUILD_EXTMOD 2182# FIXME: external modules must not descend into a sub-directory of the kernel 2183 $(Q)$(MAKE) $(build)=$(objtree)/rust src=$(srctree)/rust $@ 2184else 2185 $(Q)$(MAKE) $(build)=rust $@ 2186endif 2187 2188# Script to generate missing namespace dependencies 2189# --------------------------------------------------------------------------- 2190 2191PHONY += nsdeps 2192nsdeps: export KBUILD_NSDEPS=1 2193nsdeps: modules 2194 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 2195 2196# Clang Tooling 2197# --------------------------------------------------------------------------- 2198 2199quiet_cmd_gen_compile_commands = GEN $@ 2200 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2201 2202compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \ 2203 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2204 $(if $(CONFIG_MODULES), modules.order) FORCE 2205 $(call if_changed,gen_compile_commands) 2206 2207targets += compile_commands.json 2208 2209PHONY += clang-tidy clang-analyzer 2210 2211ifdef CONFIG_CC_IS_CLANG 2212quiet_cmd_clang_tools = CHECK $< 2213 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2214 2215clang-tidy clang-analyzer: compile_commands.json 2216 $(call cmd,clang_tools) 2217else 2218clang-tidy clang-analyzer: 2219 @echo "$@ requires CC=clang" >&2 2220 @false 2221endif 2222 2223# Scripts to check various things for consistency 2224# --------------------------------------------------------------------------- 2225 2226PHONY += includecheck versioncheck coccicheck 2227 2228includecheck: 2229 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2230 -name '*.[hcS]' -type f -print | sort \ 2231 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2232 2233versioncheck: 2234 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2235 -name '*.[hcS]' -type f -print | sort \ 2236 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2237 2238coccicheck: 2239 $(Q)$(BASH) $(srctree)/scripts/$@ 2240 2241PHONY += checkstack kernelrelease kernelversion image_name 2242 2243# UML needs a little special treatment here. It wants to use the host 2244# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2245# else wants $(ARCH), including people doing cross-builds, which means 2246# that $(SUBARCH) doesn't work here. 2247ifeq ($(ARCH), um) 2248CHECKSTACK_ARCH := $(SUBARCH) 2249else 2250CHECKSTACK_ARCH := $(ARCH) 2251endif 2252MINSTACKSIZE ?= 100 2253checkstack: 2254 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2255 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2256 2257kernelrelease: 2258 @$(filechk_kernel.release) 2259 2260kernelversion: 2261 @echo $(KERNELVERSION) 2262 2263image_name: 2264 @echo $(KBUILD_IMAGE) 2265 2266PHONY += run-command 2267run-command: 2268 $(Q)$(KBUILD_RUN_COMMAND) 2269 2270quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2271 cmd_rmfiles = rm -rf $(rm-files) 2272 2273# read saved command lines for existing targets 2274existing-targets := $(wildcard $(sort $(targets))) 2275 2276-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2277 2278endif # config-build 2279endif # mixed-build 2280endif # need-sub-make 2281 2282PHONY += FORCE 2283FORCE: 2284 2285# Declare the contents of the PHONY variable as phony. We keep that 2286# information in a variable so we can use it in if_changed and friends. 2287.PHONY: $(PHONY) 2288