1# SPDX-License-Identifier: GPL-2.0 2VERSION = 7 3PATCHLEVEL = 1 4SUBLEVEL = 0 5EXTRAVERSION = -rc1 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 -Wclippy::ignored_unit_patterns \ 491 -Aclippy::incompatible_msrv \ 492 -Wclippy::mut_mut \ 493 -Wclippy::needless_bitwise_bool \ 494 -Aclippy::needless_lifetimes \ 495 -Wclippy::no_mangle_with_rust_abi \ 496 -Wclippy::ptr_as_ptr \ 497 -Wclippy::ptr_cast_constness \ 498 -Wclippy::ref_as_ptr \ 499 -Wclippy::undocumented_unsafe_blocks \ 500 -Aclippy::uninlined_format_args \ 501 -Wclippy::unnecessary_safety_comment \ 502 -Wclippy::unnecessary_safety_doc \ 503 -Wrustdoc::missing_crate_level_docs \ 504 -Wrustdoc::unescaped_backticks 505 506KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \ 507 $(HOSTCFLAGS) -I $(srctree)/scripts/include 508KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \ 509 -I $(srctree)/scripts/include 510KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 511 -Zallow-features= 512KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 513KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 514KBUILD_PROCMACROLDFLAGS := $(or $(PROCMACROLDFLAGS),$(KBUILD_HOSTLDFLAGS)) 515 516# Make variables (CC, etc...) 517CPP = $(CC) -E 518ifneq ($(LLVM),) 519CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 520LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 521AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 522LLVM_LINK = $(LLVM_PREFIX)llvm-link$(LLVM_SUFFIX) 523NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 524OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 525OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 526READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 527STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 528else 529CC = $(CROSS_COMPILE)gcc 530LD = $(CROSS_COMPILE)ld 531AR = $(CROSS_COMPILE)ar 532NM = $(CROSS_COMPILE)nm 533OBJCOPY = $(CROSS_COMPILE)objcopy 534OBJDUMP = $(CROSS_COMPILE)objdump 535READELF = $(CROSS_COMPILE)readelf 536STRIP = $(CROSS_COMPILE)strip 537endif 538RUSTC = rustc 539RUSTDOC = rustdoc 540RUSTFMT = rustfmt 541CLIPPY_DRIVER = clippy-driver 542BINDGEN = bindgen 543PAHOLE = pahole 544RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 545LEX = flex 546YACC = bison 547AWK = awk 548INSTALLKERNEL := installkernel 549PERL = perl 550PYTHON3 = python3 551CHECK = sparse 552BASH = bash 553KGZIP = gzip 554KBZIP2 = bzip2 555KLZOP = lzop 556LZMA = lzma 557LZ4 = lz4 558XZ = xz 559ZSTD = zstd 560TAR = tar 561 562CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 563 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 564NOSTDINC_FLAGS := 565CFLAGS_MODULE = 566RUSTFLAGS_MODULE = 567AFLAGS_MODULE = 568LDFLAGS_MODULE = 569CFLAGS_KERNEL = 570RUSTFLAGS_KERNEL = 571AFLAGS_KERNEL = 572LDFLAGS_vmlinux = 573 574# Use USERINCLUDE when you must reference the UAPI directories only. 575USERINCLUDE := \ 576 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 577 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 578 -I$(srctree)/include/uapi \ 579 -I$(objtree)/include/generated/uapi \ 580 -include $(srctree)/include/linux/compiler-version.h \ 581 -include $(srctree)/include/linux/kconfig.h 582 583# Use LINUXINCLUDE when you must reference the include/ directory. 584# Needed to be compatible with the O= option 585LINUXINCLUDE := \ 586 -I$(srctree)/arch/$(SRCARCH)/include \ 587 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 588 -I$(srctree)/include \ 589 -I$(objtree)/include \ 590 $(USERINCLUDE) 591 592KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 593 594KBUILD_CFLAGS := 595KBUILD_CFLAGS += -fshort-wchar 596KBUILD_CFLAGS += -funsigned-char 597KBUILD_CFLAGS += -fno-common 598KBUILD_CFLAGS += -fno-PIE 599KBUILD_CFLAGS += -fno-strict-aliasing 600 601KBUILD_CPPFLAGS := -D__KERNEL__ 602KBUILD_RUSTFLAGS := $(rust_common_flags) \ 603 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 604 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 605 -Csymbol-mangling-version=v0 \ 606 -Crelocation-model=static \ 607 -Zfunction-sections=n \ 608 -Wclippy::float_arithmetic 609 610KBUILD_AFLAGS_KERNEL := 611KBUILD_CFLAGS_KERNEL := 612KBUILD_RUSTFLAGS_KERNEL := 613KBUILD_AFLAGS_MODULE := -DMODULE 614KBUILD_CFLAGS_MODULE := -DMODULE 615KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 616KBUILD_LDFLAGS_MODULE := 617KBUILD_LDFLAGS := 618CLANG_FLAGS := 619 620ifeq ($(KBUILD_CLIPPY),1) 621 RUSTC_OR_CLIPPY_QUIET := CLIPPY 622 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 623else 624 RUSTC_OR_CLIPPY_QUIET := RUSTC 625 RUSTC_OR_CLIPPY = $(RUSTC) 626endif 627 628# Allows the usage of unstable features in stable compilers. 629export RUSTC_BOOTSTRAP := 1 630 631# Allows finding `.clippy.toml` in out-of-srctree builds. 632export CLIPPY_CONF_DIR := $(srctree) 633 634export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 635export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN LLVM_LINK 636export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 637export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 638export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 639export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD TAR 640export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS KBUILD_PROCMACROLDFLAGS LDFLAGS_MODULE 641export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 642 643export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 644export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 645export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 646export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 647export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 648export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 649 650# Files to ignore in find ... statements 651 652export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 653 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 654 -prune -o 655 656# =========================================================================== 657# Rules shared between *config targets and build targets 658 659# Basic helpers built in scripts/basic/ 660PHONY += scripts_basic 661scripts_basic: KBUILD_HOSTCFLAGS := $(KBUILD_HOSTCFLAGS) 662scripts_basic: KBUILD_HOSTLDFLAGS := $(KBUILD_HOSTLDFLAGS) 663scripts_basic: 664 $(Q)$(MAKE) $(build)=scripts/basic 665 666PHONY += outputmakefile 667ifdef building_out_of_srctree 668# Before starting out-of-tree build, make sure the source tree is clean. 669# outputmakefile generates a Makefile in the output directory, if using a 670# separate output directory. This allows convenient use of make in the 671# output directory. 672# At the same time when output Makefile generated, generate .gitignore to 673# ignore whole output directory 674 675ifdef KBUILD_EXTMOD 676print_env_for_makefile = \ 677 echo "export KBUILD_OUTPUT = $(objtree)"; \ 678 echo "export KBUILD_EXTMOD = $(realpath $(srcroot))" ; \ 679 echo "export KBUILD_EXTMOD_OUTPUT = $(CURDIR)" 680else 681print_env_for_makefile = \ 682 echo "export KBUILD_OUTPUT = $(CURDIR)" 683endif 684 685filechk_makefile = { \ 686 echo "\# Automatically generated by $(abs_srctree)/Makefile: don't edit"; \ 687 $(print_env_for_makefile); \ 688 echo "include $(abs_srctree)/Makefile"; \ 689 } 690 691$(objtree)/Makefile: FORCE 692 $(call filechk,makefile) 693 694# Prevent $(srcroot)/Makefile from inhibiting the rule to run. 695PHONY += $(objtree)/Makefile 696 697outputmakefile: $(objtree)/Makefile 698ifeq ($(KBUILD_EXTMOD),) 699 @if [ -f $(srctree)/.config -o \ 700 -d $(srctree)/include/config -o \ 701 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 702 echo >&2 "***"; \ 703 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 704 echo >&2 "*** in $(abs_srctree)";\ 705 echo >&2 "***"; \ 706 false; \ 707 fi 708else 709 @if [ -f $(srcroot)/modules.order ]; then \ 710 echo >&2 "***"; \ 711 echo >&2 "*** The external module source tree is not clean."; \ 712 echo >&2 "*** Please run 'make -C $(abs_srctree) M=$(realpath $(srcroot)) clean'"; \ 713 echo >&2 "***"; \ 714 false; \ 715 fi 716endif 717 $(Q)ln -fsn $(srcroot) source 718 $(Q)test -e .gitignore || \ 719 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 720endif 721 722# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 723# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 724# CC_VERSION_TEXT, RUSTC_VERSION_TEXT and PAHOLE_VERSION are referenced from 725# Kconfig (so they need export), and from include/config/auto.conf.cmd to 726# detect the version changes between builds. 727CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 728RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null)) 729PAHOLE_VERSION = $(shell $(srctree)/scripts/pahole-version.sh $(PAHOLE)) 730 731ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 732include $(srctree)/scripts/Makefile.clang 733endif 734 735# Include this also for config targets because some architectures need 736# cc-cross-prefix to determine CROSS_COMPILE. 737ifdef need-compiler 738include $(srctree)/scripts/Makefile.compiler 739endif 740 741ifdef config-build 742# =========================================================================== 743# *config targets only - make sure prerequisites are updated, and descend 744# in scripts/kconfig to make the *config target 745 746# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 747# KBUILD_DEFCONFIG may point out an alternative default configuration 748# used for 'make defconfig' 749include $(srctree)/arch/$(SRCARCH)/Makefile 750export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT RUSTC_VERSION_TEXT PAHOLE_VERSION 751 752config: outputmakefile scripts_basic FORCE 753 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 754 755%config: outputmakefile scripts_basic FORCE 756 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 757 758else #!config-build 759# =========================================================================== 760# Build targets only - this includes vmlinux, arch-specific targets, clean 761# targets and others. In general all targets except *config targets. 762 763# If building an external module we do not care about the all: rule 764# but instead __all depend on modules 765PHONY += all 766ifeq ($(KBUILD_EXTMOD),) 767__all: all 768else 769__all: modules 770endif 771 772targets := 773 774# Decide whether to build built-in, modular, or both. 775# Normally, just do built-in. 776 777KBUILD_MODULES := 778KBUILD_BUILTIN := y 779 780# If we have only "make modules", don't compile built-in objects. 781ifeq ($(MAKECMDGOALS),modules) 782 KBUILD_BUILTIN := 783endif 784 785# If we have "make <whatever> modules", compile modules 786# in addition to whatever we do anyway. 787# Just "make" or "make all" shall build modules as well 788 789ifneq ($(filter all modules nsdeps compile_commands.json clang-%,$(MAKECMDGOALS)),) 790 KBUILD_MODULES := y 791endif 792 793ifeq ($(MAKECMDGOALS),) 794 KBUILD_MODULES := y 795endif 796 797export KBUILD_MODULES KBUILD_BUILTIN 798 799ifdef need-config 800include $(objtree)/include/config/auto.conf 801endif 802 803CC_FLAGS_DIALECT := -std=gnu11 804# Allow including a tagged struct or union anonymously in another struct/union. 805CC_FLAGS_DIALECT += $(CONFIG_CC_MS_EXTENSIONS) 806# Clang enables warnings about GNU and Microsoft extensions by default, disable 807# them because this is expected with the above options. 808ifdef CONFIG_CC_IS_CLANG 809CC_FLAGS_DIALECT += -Wno-gnu 810CC_FLAGS_DIALECT += -Wno-microsoft-anon-tag 811endif 812export CC_FLAGS_DIALECT 813KBUILD_CFLAGS += $(CC_FLAGS_DIALECT) 814 815ifeq ($(KBUILD_EXTMOD),) 816# Objects we will link into vmlinux / subdirs we need to visit 817core-y := 818drivers-y := 819libs-y := lib/ 820endif # KBUILD_EXTMOD 821 822# The all: target is the default when no target is given on the 823# command line. 824# This allow a user to issue only 'make' to build a kernel including modules 825# Defaults to vmlinux, but the arch makefile usually adds further targets 826all: vmlinux 827 828CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 829ifdef CONFIG_CC_IS_GCC 830CFLAGS_GCOV += -fno-tree-loop-im 831endif 832export CFLAGS_GCOV 833 834# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 835ifdef CONFIG_FUNCTION_TRACER 836 CC_FLAGS_FTRACE := -pg 837endif 838 839ifdef CONFIG_TRACEPOINTS 840# To check for unused tracepoints (tracepoints that are defined but never 841# called), run with: 842# 843# make UT=1 844# 845# Each unused tracepoints can take up to 5KB of memory in the running kernel. 846# It is best to remove any that are not used. 847# 848# This command line option will be removed when all current unused 849# tracepoints are removed. 850 851ifeq ("$(origin UT)", "command line") 852 WARN_ON_UNUSED_TRACEPOINTS := $(UT) 853endif 854endif # CONFIG_TRACEPOINTS 855 856export WARN_ON_UNUSED_TRACEPOINTS 857 858# Per-version Rust flags. These are like `rust_common_flags`, but may 859# depend on the Rust compiler version (e.g. using `rustc-min-version`). 860# 861# `-Aclippy::precedence`: the lint was extended in Rust 1.85.0 to 862# include bitmasking and shift operations. However, because it generated 863# many hits, in Rust 1.86.0 it was split into a new `precedence_bits` 864# lint which is not enabled by default. 865rust_common_flags_per_version := \ 866 $(if $(call rustc-min-version,108600),,-Aclippy::precedence) 867 868rust_common_flags += $(rust_common_flags_per_version) 869KBUILD_HOSTRUSTFLAGS += $(rust_common_flags_per_version) $(HOSTRUSTFLAGS) 870KBUILD_RUSTFLAGS += $(rust_common_flags_per_version) 871 872include $(srctree)/arch/$(SRCARCH)/Makefile 873 874ifdef need-config 875ifdef may-sync-config 876# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 877# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 878# because some architectures define CROSS_COMPILE there. 879include include/config/auto.conf.cmd 880 881$(KCONFIG_CONFIG): 882 @echo >&2 '***' 883 @echo >&2 '*** Configuration file "$@" not found!' 884 @echo >&2 '***' 885 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 886 @echo >&2 '*** "make menuconfig" or "make xconfig").' 887 @echo >&2 '***' 888 @/bin/false 889 890# The actual configuration files used during the build are stored in 891# include/generated/ and include/config/. Update them if .config is newer than 892# include/config/auto.conf (which mirrors .config). 893# 894# This exploits the 'multi-target pattern rule' trick. 895# The syncconfig should be executed only once to make all the targets. 896# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 897# 898# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 899# so you cannot notice that Kconfig is waiting for the user input. 900%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 901 $(Q)$(kecho) " SYNC $@" 902 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 903else # !may-sync-config 904# External modules and some install targets need include/generated/autoconf.h 905# and include/config/auto.conf but do not care if they are up-to-date. 906# Use auto.conf to show the error message 907 908checked-configs := $(addprefix $(objtree)/, include/generated/autoconf.h include/generated/rustc_cfg include/config/auto.conf) 909missing-configs := $(filter-out $(wildcard $(checked-configs)), $(checked-configs)) 910 911ifdef missing-configs 912PHONY += $(objtree)/include/config/auto.conf 913 914$(objtree)/include/config/auto.conf: 915 @echo >&2 '***' 916 @echo >&2 '*** ERROR: Kernel configuration is invalid. The following files are missing:' 917 @printf >&2 '*** - %s\n' $(missing-configs) 918 @echo >&2 '*** Run "make oldconfig && make prepare" on kernel source to fix it.' 919 @echo >&2 '***' 920 @/bin/false 921endif 922 923endif # may-sync-config 924endif # need-config 925 926KBUILD_CFLAGS += -fno-delete-null-pointer-checks 927 928ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 929KBUILD_CFLAGS += -O2 930KBUILD_RUSTFLAGS += -Copt-level=2 931else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 932KBUILD_CFLAGS += -Os 933KBUILD_RUSTFLAGS += -Copt-level=s 934endif 935 936# Always set `debug-assertions` and `overflow-checks` because their default 937# depends on `opt-level` and `debug-assertions`, respectively. 938KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 939KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 940 941# Tell gcc to never replace conditional load with a non-conditional one 942ifdef CONFIG_CC_IS_GCC 943# gcc-10 renamed --param=allow-store-data-races=0 to 944# -fno-allow-store-data-races. 945KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 946KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 947endif 948 949ifdef CONFIG_READABLE_ASM 950# Disable optimizations that make assembler listings hard to read. 951# reorder blocks reorders the control in the function 952# ipa clone creates specialized cloned functions 953# partial inlining inlines only parts of functions 954KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 955endif 956 957stackp-flags-y := -fno-stack-protector 958stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 959stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 960 961KBUILD_CFLAGS += $(stackp-flags-y) 962 963ifdef CONFIG_FRAME_POINTER 964KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 965KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 966else 967# Some targets (ARM with Thumb2, for example), can't be built with frame 968# pointers. For those, we don't have FUNCTION_TRACER automatically 969# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 970# incompatible with -fomit-frame-pointer with current GCC, so we don't use 971# -fomit-frame-pointer with FUNCTION_TRACER. 972# In the Rust target specification, "frame-pointer" is set explicitly 973# to "may-omit". 974ifndef CONFIG_FUNCTION_TRACER 975KBUILD_CFLAGS += -fomit-frame-pointer 976endif 977endif 978 979# Initialize all stack variables with a 0xAA pattern. 980ifdef CONFIG_INIT_STACK_ALL_PATTERN 981KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 982endif 983 984# Initialize all stack variables with a zero value. 985ifdef CONFIG_INIT_STACK_ALL_ZERO 986KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 987ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 988# https://github.com/llvm/llvm-project/issues/44842 989CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 990export CC_AUTO_VAR_INIT_ZERO_ENABLER 991KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 992endif 993endif 994 995ifdef CONFIG_CC_IS_CLANG 996ifdef CONFIG_CC_HAS_COUNTED_BY_PTR 997KBUILD_CFLAGS += -fexperimental-late-parse-attributes 998endif 999endif 1000 1001# Explicitly clear padding bits during variable initialization 1002KBUILD_CFLAGS += $(call cc-option,-fzero-init-padding-bits=all) 1003 1004# While VLAs have been removed, GCC produces unreachable stack probes 1005# for the randomize_kstack_offset feature. Disable it for all compilers. 1006KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 1007 1008# Get details on warnings generated due to GCC value tracking. 1009KBUILD_CFLAGS += $(call cc-option, -fdiagnostics-show-context=2) 1010 1011# Show inlining notes for __attribute__((warning/error)) call chains. 1012# GCC supports this unconditionally while Clang 23+ provides a flag. 1013KBUILD_CFLAGS += $(call cc-option, -fdiagnostics-show-inlining-chain) 1014 1015# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 1016ifdef CONFIG_ZERO_CALL_USED_REGS 1017KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 1018endif 1019 1020ifdef CONFIG_FUNCTION_TRACER 1021ifdef CONFIG_FTRACE_MCOUNT_USE_CC 1022 CC_FLAGS_FTRACE += -mrecord-mcount 1023 ifdef CONFIG_HAVE_NOP_MCOUNT 1024 ifeq ($(call cc-option-yn, -mnop-mcount),y) 1025 CC_FLAGS_FTRACE += -mnop-mcount 1026 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 1027 endif 1028 endif 1029endif 1030ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 1031 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 1032 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 1033 endif 1034endif 1035ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 1036 ifdef CONFIG_HAVE_C_RECORDMCOUNT 1037 BUILD_C_RECORDMCOUNT := y 1038 export BUILD_C_RECORDMCOUNT 1039 endif 1040endif 1041ifdef CONFIG_HAVE_FENTRY 1042 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 1043 ifeq ($(call cc-option-yn, -mfentry),y) 1044 CC_FLAGS_FTRACE += -mfentry 1045 CC_FLAGS_USING += -DCC_USING_FENTRY 1046 endif 1047endif 1048export CC_FLAGS_FTRACE 1049KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 1050KBUILD_AFLAGS += $(CC_FLAGS_USING) 1051endif 1052 1053# We trigger additional mismatches with less inlining 1054ifdef CONFIG_DEBUG_SECTION_MISMATCH 1055KBUILD_CFLAGS += -fno-inline-functions-called-once 1056endif 1057 1058# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 1059ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 1060KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 1061KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 1062LDFLAGS_vmlinux += --gc-sections 1063endif 1064 1065ifdef CONFIG_SHADOW_CALL_STACK 1066ifndef CONFIG_DYNAMIC_SCS 1067CC_FLAGS_SCS := -fsanitize=shadow-call-stack 1068KBUILD_CFLAGS += $(CC_FLAGS_SCS) 1069KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack 1070endif 1071export CC_FLAGS_SCS 1072endif 1073 1074ifdef CONFIG_LTO_CLANG 1075ifdef CONFIG_LTO_CLANG_FULL 1076CC_FLAGS_LTO := -flto 1077else 1078CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 1079 1080# These LLVM options were initially added with only in-process ThinLTO 1081# support, so avoid distributed ThinLTO support for now. 1082ifdef CONFIG_LTO_CLANG_THIN 1083KBUILD_LDFLAGS += $(call ld-option,--lto-whole-program-visibility -mllvm -always-rename-promoted-locals=false) 1084endif 1085endif 1086CC_FLAGS_LTO += -fvisibility=hidden 1087 1088# Limit inlining across translation units to reduce binary size 1089KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 1090endif 1091 1092ifdef CONFIG_LTO 1093KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 1094KBUILD_AFLAGS += -fno-lto 1095export CC_FLAGS_LTO 1096endif 1097 1098ifdef CONFIG_CFI 1099CC_FLAGS_CFI := -fsanitize=kcfi 1100ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS 1101 CC_FLAGS_CFI += -fsanitize-cfi-icall-experimental-normalize-integers 1102endif 1103ifdef CONFIG_FINEIBT_BHI 1104 CC_FLAGS_CFI += -fsanitize-kcfi-arity 1105endif 1106ifdef CONFIG_RUST 1107 # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects 1108 # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS. 1109 RUSTC_FLAGS_CFI := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers 1110 KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI) 1111 export RUSTC_FLAGS_CFI 1112endif 1113KBUILD_CFLAGS += $(CC_FLAGS_CFI) 1114export CC_FLAGS_CFI 1115endif 1116 1117# Architectures can define flags to add/remove for floating-point support 1118CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT 1119export CC_FLAGS_FPU 1120export CC_FLAGS_NO_FPU 1121 1122ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 1123# Set the minimal function alignment. Use the newer GCC option 1124# -fmin-function-alignment if it is available, or fall back to -falign-funtions. 1125# See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. 1126ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT 1127KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) 1128else 1129KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 1130endif 1131endif 1132 1133# arch Makefile may override CC so keep this after arch Makefile is included 1134NOSTDINC_FLAGS += -nostdinc 1135 1136# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 1137# the kernel uses only C99 flexible arrays for dynamically sized trailing 1138# arrays. Enforce this for everything that may examine structure sizes and 1139# perform bounds checking. 1140KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 1141 1142# disable invalid "can't wrap" optimizations for signed / pointers 1143KBUILD_CFLAGS += -fno-strict-overflow 1144 1145# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1146KBUILD_CFLAGS += -fno-stack-check 1147 1148# conserve stack if available 1149ifdef CONFIG_CC_IS_GCC 1150KBUILD_CFLAGS += -fconserve-stack 1151endif 1152 1153# Ensure compilers do not transform certain loops into calls to wcslen() 1154KBUILD_CFLAGS += -fno-builtin-wcslen 1155 1156# change __FILE__ to the relative path to the source directory 1157ifdef building_out_of_srctree 1158KBUILD_CPPFLAGS += -fmacro-prefix-map=$(srcroot)/= 1159ifeq ($(call rustc-option-yn, --remap-path-scope=macro),y) 1160KBUILD_RUSTFLAGS += --remap-path-prefix=$(srcroot)/= --remap-path-scope=macro 1161endif 1162endif 1163 1164# include additional Makefiles when needed 1165include-y := scripts/Makefile.warn 1166include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1167include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1168include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1169include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1170include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1171include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1172include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1173include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1174include-$(CONFIG_KSTACK_ERASE) += scripts/Makefile.kstack_erase 1175include-$(CONFIG_AUTOFDO_CLANG) += scripts/Makefile.autofdo 1176include-$(CONFIG_PROPELLER_CLANG) += scripts/Makefile.propeller 1177include-$(CONFIG_WARN_CONTEXT_ANALYSIS) += scripts/Makefile.context-analysis 1178include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1179 1180include $(addprefix $(srctree)/, $(include-y)) 1181 1182# scripts/Makefile.gcc-plugins is intentionally included last. 1183# Do not add $(call cc-option,...) below this line. When you build the kernel 1184# from the clean source tree, the GCC plugins do not exist at this point. 1185 1186# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1187KBUILD_CPPFLAGS += $(KCPPFLAGS) 1188KBUILD_AFLAGS += $(KAFLAGS) 1189KBUILD_CFLAGS += $(KCFLAGS) 1190KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1191 1192KBUILD_LDFLAGS_MODULE += --build-id=sha1 1193LDFLAGS_vmlinux += --build-id=sha1 1194 1195KBUILD_LDFLAGS += -z noexecstack 1196ifeq ($(CONFIG_LD_IS_BFD),y) 1197KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1198endif 1199 1200ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1201LDFLAGS_vmlinux += -X 1202endif 1203 1204ifeq ($(CONFIG_RELR),y) 1205# ld.lld before 15 did not support -z pack-relative-relocs. 1206LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1207endif 1208 1209# We never want expected sections to be placed heuristically by the 1210# linker. All sections should be explicitly named in the linker script. 1211ifdef CONFIG_LD_ORPHAN_WARN 1212LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1213endif 1214 1215ifneq ($(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS),) 1216LDFLAGS_vmlinux += --emit-relocs --discard-none 1217endif 1218 1219# Align the architecture of userspace programs with the kernel 1220USERFLAGS_FROM_KERNEL := --target=% 1221 1222ifdef CONFIG_ARCH_USERFLAGS 1223KBUILD_USERCFLAGS += $(CONFIG_ARCH_USERFLAGS) 1224KBUILD_USERLDFLAGS += $(CONFIG_ARCH_USERFLAGS) 1225else 1226# If not overridden also inherit the bit size 1227USERFLAGS_FROM_KERNEL += -m32 -m64 1228endif 1229 1230KBUILD_USERCFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1231KBUILD_USERLDFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1232 1233# userspace programs are linked via the compiler, use the correct linker 1234ifdef CONFIG_CC_IS_CLANG 1235KBUILD_USERLDFLAGS += --ld-path=$(LD) 1236endif 1237 1238# make the checker run with the right architecture 1239CHECKFLAGS += --arch=$(ARCH) 1240 1241# insure the checker run with the right endianness 1242CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1243 1244# the checker needs the correct machine size 1245CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1246 1247# Validate the checker is available and functional 1248ifneq ($(KBUILD_CHECKSRC), 0) 1249 ifneq ($(shell $(srctree)/scripts/checker-valid.sh $(CHECK) $(CHECKFLAGS)), 1) 1250 $(warning C=$(KBUILD_CHECKSRC) specified, but $(CHECK) is not available or not up to date) 1251 KBUILD_CHECKSRC = 0 1252 endif 1253endif 1254 1255# Default kernel image to build when no specific target is given. 1256# KBUILD_IMAGE may be overruled on the command line or 1257# set in the environment 1258# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1259# this default value 1260export KBUILD_IMAGE ?= vmlinux 1261 1262# 1263# INSTALL_PATH specifies where to place the updated kernel and system map 1264# images. Default is /boot, but you can set it to other values 1265export INSTALL_PATH ?= /boot 1266 1267# 1268# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1269# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1270# an argument if needed. Otherwise it defaults to the kernel install path 1271# 1272export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1273 1274# 1275# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1276# relocations required by build roots. This is not defined in the 1277# makefile but the argument can be passed to make if needed. 1278# 1279 1280MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1281export MODLIB 1282 1283PHONY += prepare0 1284 1285ifeq ($(KBUILD_EXTMOD),) 1286 1287build-dir := . 1288clean-dirs := $(sort . Documentation \ 1289 $(patsubst %/,%,$(filter %/, $(core-) \ 1290 $(drivers-) $(libs-)))) 1291 1292export ARCH_CORE := $(core-y) 1293export ARCH_LIB := $(filter %/, $(libs-y)) 1294export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1295# Externally visible symbols (used by link-vmlinux.sh) 1296 1297KBUILD_VMLINUX_OBJS := built-in.a $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1298KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1299 1300export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1301export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1302 1303ifdef CONFIG_TRIM_UNUSED_KSYMS 1304# For the kernel to actually contain only the needed exported symbols, 1305# we have to build modules as well to determine what those symbols are. 1306KBUILD_MODULES := y 1307endif 1308 1309PHONY += vmlinux_a 1310vmlinux_a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1311 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_a 1312 1313vmlinux.a: vmlinux_a 1314 @: 1315 1316PHONY += vmlinux_o 1317vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1318 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1319 1320vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1321 @: 1322 1323PHONY += vmlinux 1324# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1325# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1326# unrelated; the decompressors just happen to have the same base name, 1327# arch/*/boot/compressed/vmlinux. 1328# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1329# 1330# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1331# https://savannah.gnu.org/bugs/?61463 1332# For Make > 4.4, the following simple code will work: 1333# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1334vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1335vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1336vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1337 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1338 1339# The actual objects are generated when descending, 1340# make sure no implicit rule kicks in 1341$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1342 1343ifeq ($(origin KERNELRELEASE),file) 1344filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1345else 1346filechk_kernel.release = echo $(KERNELRELEASE) 1347endif 1348 1349# Store (new) KERNELRELEASE string in include/config/kernel.release 1350include/config/kernel.release: FORCE 1351 $(call filechk,kernel.release) 1352 1353# Additional helpers built in scripts/ 1354# Carefully list dependencies so we do not try to build scripts twice 1355# in parallel 1356PHONY += scripts 1357scripts: scripts_basic scripts_dtc 1358 $(Q)$(MAKE) $(build)=$(@) 1359 1360# Things we need to do before we recursively start building the kernel 1361# or the modules are listed in "prepare". 1362# A multi level approach is used. prepareN is processed before prepareN-1. 1363# archprepare is used in arch Makefiles and when processed asm symlink, 1364# version.h and scripts_basic is processed / created. 1365 1366PHONY += prepare archprepare 1367 1368archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1369 asm-generic $(version_h) include/generated/utsrelease.h \ 1370 include/generated/compile.h include/generated/autoconf.h \ 1371 include/generated/rustc_cfg remove-stale-files 1372 1373prepare0: archprepare 1374 $(Q)$(MAKE) $(build)=scripts/mod 1375 $(Q)$(MAKE) $(build)=. prepare 1376 1377# All the preparing.. 1378prepare: prepare0 1379ifdef CONFIG_RUST 1380 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1381 $(Q)$(MAKE) $(build)=rust 1382endif 1383 1384PHONY += remove-stale-files 1385remove-stale-files: 1386 $(Q)$(srctree)/scripts/remove-stale-files 1387 1388# Support for using generic headers in asm-generic 1389asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj 1390 1391PHONY += asm-generic uapi-asm-generic 1392asm-generic: uapi-asm-generic 1393 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1394 generic=include/asm-generic 1395uapi-asm-generic: 1396 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1397 generic=include/uapi/asm-generic 1398 1399# Generate some files 1400# --------------------------------------------------------------------------- 1401 1402# KERNELRELEASE can change from a few different places, meaning version.h 1403# needs to be updated, so this check is forced on all builds 1404 1405uts_len := 64 1406define filechk_utsrelease.h 1407 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1408 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1409 exit 1; \ 1410 fi; \ 1411 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1412endef 1413 1414define filechk_version.h 1415 if [ $(SUBLEVEL) -gt 255 ]; then \ 1416 echo \#define LINUX_VERSION_CODE $(shell \ 1417 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1418 else \ 1419 echo \#define LINUX_VERSION_CODE $(shell \ 1420 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1421 fi; \ 1422 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1423 ((c) > 255 ? 255 : (c)))'; \ 1424 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1425 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1426 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1427endef 1428 1429$(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1430$(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0) 1431$(version_h): FORCE 1432 $(call filechk,version.h) 1433 1434include/generated/utsrelease.h: include/config/kernel.release FORCE 1435 $(call filechk,utsrelease.h) 1436 1437filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1438 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1439 1440include/generated/compile.h: FORCE 1441 $(call filechk,compile.h) 1442 1443PHONY += headerdep 1444headerdep: 1445 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1446 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1447 1448# --------------------------------------------------------------------------- 1449# Kernel headers 1450 1451#Default location for installed headers 1452export INSTALL_HDR_PATH = $(objtree)/usr 1453 1454quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1455 cmd_headers_install = \ 1456 mkdir -p $(INSTALL_HDR_PATH); \ 1457 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1458 usr/include $(INSTALL_HDR_PATH) 1459 1460PHONY += headers_install 1461headers_install: headers 1462 $(call cmd,headers_install) 1463 1464PHONY += archheaders archscripts 1465 1466hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1467 1468PHONY += headers 1469headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders 1470ifdef HEADER_ARCH 1471 $(Q)$(MAKE) -f $(srctree)/Makefile HEADER_ARCH= SRCARCH=$(HEADER_ARCH) headers 1472else 1473 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1474 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1475endif 1476 1477ifdef CONFIG_HEADERS_INSTALL 1478prepare: headers 1479endif 1480 1481PHONY += usr_gen_init_cpio 1482usr_gen_init_cpio: scripts_basic 1483 $(Q)$(MAKE) $(build)=usr usr/gen_init_cpio 1484 1485PHONY += scripts_unifdef 1486scripts_unifdef: scripts_basic 1487 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1488 1489PHONY += scripts_gen_packed_field_checks 1490scripts_gen_packed_field_checks: scripts_basic 1491 $(Q)$(MAKE) $(build)=scripts scripts/gen_packed_field_checks 1492 1493# --------------------------------------------------------------------------- 1494# Install 1495 1496# Many distributions have the custom install script, /sbin/installkernel. 1497# If DKMS is installed, 'make install' will eventually recurse back 1498# to this Makefile to build and install external modules. 1499# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1500 1501quiet_cmd_install = INSTALL $(INSTALL_PATH) 1502 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1503 1504# --------------------------------------------------------------------------- 1505# vDSO install 1506 1507PHONY += vdso_install 1508vdso_install: export INSTALL_FILES = $(vdso-install-y) 1509vdso_install: 1510 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1511 1512# --------------------------------------------------------------------------- 1513# Tools 1514 1515ifdef CONFIG_OBJTOOL 1516prepare: tools/objtool 1517endif 1518 1519ifdef CONFIG_BPF 1520ifdef CONFIG_DEBUG_INFO_BTF 1521prepare: tools/bpf/resolve_btfids 1522endif 1523endif 1524 1525# The tools build system is not a part of Kbuild and tends to introduce 1526# its own unique issues. If you need to integrate a new tool into Kbuild, 1527# please consider locating that tool outside the tools/ tree and using the 1528# standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry 1529# here. See Documentation/kbuild/makefiles.rst for details. 1530 1531PHONY += resolve_btfids_clean 1532 1533resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1534 1535# tools/bpf/resolve_btfids directory might not exist 1536# in output directory, skip its clean in that case 1537resolve_btfids_clean: 1538ifneq ($(wildcard $(resolve_btfids_O)),) 1539 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1540endif 1541 1542PHONY += objtool_clean objtool_mrproper 1543 1544objtool_O = $(abspath $(objtree))/tools/objtool 1545 1546objtool_clean objtool_mrproper: 1547ifneq ($(wildcard $(objtool_O)),) 1548 $(Q)$(MAKE) -sC $(abs_srctree)/tools/objtool O=$(objtool_O) srctree=$(abs_srctree) $(patsubst objtool_%,%,$@) 1549endif 1550 1551tools/: FORCE 1552 $(Q)mkdir -p $(objtree)/tools 1553 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1554 1555tools/%: FORCE 1556 $(Q)mkdir -p $(objtree)/tools 1557 $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1558 1559# --------------------------------------------------------------------------- 1560# Kernel selftest 1561 1562PHONY += kselftest 1563kselftest: headers 1564 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1565 1566kselftest-%: headers FORCE 1567 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1568 1569PHONY += kselftest-merge 1570kselftest-merge: 1571 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1572 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1573 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1574 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1575 1576# --------------------------------------------------------------------------- 1577# Devicetree files 1578 1579ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1580dtstree := arch/$(SRCARCH)/boot/dts 1581endif 1582 1583dtbindingtree := Documentation/devicetree/bindings 1584 1585%.yaml: dtbs_prepare 1586 $(Q)$(MAKE) $(build)=$(dtbindingtree) \ 1587 $(dtbindingtree)/$(patsubst %.yaml,%.example.dtb,$@) dt_binding_check_one 1588 1589ifneq ($(dtstree),) 1590 1591%.dtb: dtbs_prepare 1592 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1593 1594%.dtbo: dtbs_prepare 1595 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1596 1597PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1598dtbs: dtbs_prepare 1599 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1 1600 1601# include/config/kernel.release is actually needed when installing DTBs because 1602# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1603# dtbs_install depend on it as dtbs_install may run as root. 1604dtbs_prepare: include/config/kernel.release scripts_dtc 1605 1606ifneq ($(filter dtbs_check %.yaml, $(MAKECMDGOALS)),) 1607export CHECK_DTBS=y 1608endif 1609 1610ifneq ($(CHECK_DTBS),) 1611dtbs_prepare: dt_binding_schemas 1612endif 1613 1614dtbs_check: dtbs 1615 1616dtbs_install: 1617 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) 1618 1619ifdef CONFIG_OF_EARLY_FLATTREE 1620all: dtbs 1621endif 1622 1623ifdef CONFIG_GENERIC_BUILTIN_DTB 1624vmlinux: dtbs 1625endif 1626 1627endif 1628 1629PHONY += scripts_dtc 1630scripts_dtc: scripts_basic 1631 $(Q)$(MAKE) $(build)=scripts/dtc 1632 1633ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1634export CHECK_DTBS=y 1635endif 1636 1637PHONY += dt_binding_check dt_binding_schemas 1638dt_binding_check: dt_binding_schemas scripts_dtc 1639 $(Q)$(MAKE) $(build)=$(dtbindingtree) $@ 1640 1641dt_binding_schemas: 1642 $(Q)$(MAKE) $(build)=$(dtbindingtree) 1643 1644PHONY += dt_compatible_check 1645dt_compatible_check: dt_binding_schemas 1646 $(Q)$(MAKE) $(build)=$(dtbindingtree) $@ 1647 1648# --------------------------------------------------------------------------- 1649# Modules 1650 1651ifdef CONFIG_MODULES 1652 1653# By default, build modules as well 1654 1655all: modules 1656 1657# When we're building modules with modversions, we need to consider 1658# the built-in objects during the descend as well, in order to 1659# make sure the checksums are up to date before we record them. 1660ifdef CONFIG_MODVERSIONS 1661 KBUILD_BUILTIN := y 1662endif 1663 1664# Build modules 1665# 1666 1667# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1668# is an exception. 1669ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1670KBUILD_BUILTIN := y 1671modules: vmlinux 1672endif 1673 1674modules: modules_prepare 1675 1676# Target to prepare building external modules 1677modules_prepare: prepare 1678 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1679 1680endif # CONFIG_MODULES 1681 1682### 1683# Cleaning is done on three levels. 1684# make clean Delete most generated files 1685# Leave enough to build external modules 1686# make mrproper Delete the current configuration, and all generated files 1687# make distclean Remove editor backup files, patch leftover files and the like 1688 1689# Directories & files removed with 'make clean' 1690CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1691 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1692 modules.builtin.ranges vmlinux.o.map vmlinux.unstripped \ 1693 vmlinux.thinlto-index builtin.order \ 1694 compile_commands.json rust/test \ 1695 rust-project.json .vmlinux.objs .vmlinux.export.c \ 1696 .builtin-dtbs-list .builtin-dtbs.S 1697 1698# Directories & files removed with 'make mrproper' 1699MRPROPER_FILES += include/config include/generated \ 1700 arch/$(SRCARCH)/include/generated .objdiff \ 1701 debian snap tar-install PKGBUILD pacman \ 1702 .config .config.old .version \ 1703 Module.symvers \ 1704 certs/signing_key.pem \ 1705 certs/x509.genkey \ 1706 vmlinux-gdb.py \ 1707 rpmbuild \ 1708 rust/libmacros.so rust/libmacros.dylib \ 1709 rust/libpin_init_internal.so rust/libpin_init_internal.dylib 1710 1711# clean - Delete most, but leave enough to build external modules 1712# 1713clean: private rm-files := $(CLEAN_FILES) 1714 1715PHONY += archclean vmlinuxclean 1716 1717vmlinuxclean: 1718 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1719 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1720 1721clean: archclean vmlinuxclean resolve_btfids_clean objtool_clean 1722 1723# mrproper - Delete all generated files, including .config 1724# 1725mrproper: private rm-files := $(MRPROPER_FILES) 1726mrproper-dirs := $(addprefix _mrproper_,scripts) 1727 1728PHONY += $(mrproper-dirs) mrproper 1729$(mrproper-dirs): 1730 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1731 1732mrproper: clean objtool_mrproper $(mrproper-dirs) 1733 $(call cmd,rmfiles) 1734 @find . $(RCS_FIND_IGNORE) \ 1735 \( -name '*.rmeta' \) \ 1736 -type f -print | xargs rm -f 1737 1738# distclean 1739# 1740PHONY += distclean 1741 1742distclean: mrproper 1743 @find . $(RCS_FIND_IGNORE) \ 1744 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1745 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1746 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1747 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1748 -type f -print | xargs rm -f 1749 1750 1751# Packaging of the kernel to various formats 1752# --------------------------------------------------------------------------- 1753 1754modules-cpio-pkg: usr_gen_init_cpio 1755 1756%src-pkg: FORCE 1757 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1758%pkg: include/config/kernel.release FORCE 1759 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1760 1761# Brief documentation of the typical targets used 1762# --------------------------------------------------------------------------- 1763 1764boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1765boards := $(sort $(notdir $(boards))) 1766board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1767board-dirs := $(sort $(notdir $(board-dirs:/=))) 1768 1769PHONY += help 1770help: 1771 @echo 'Cleaning targets:' 1772 @echo ' clean - Remove most generated files but keep the config and' 1773 @echo ' enough build support to build external modules' 1774 @echo ' mrproper - Remove all generated files + config + various backup files' 1775 @echo ' distclean - mrproper + remove editor backup and patch files' 1776 @echo '' 1777 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1778 @echo '' 1779 @echo 'Other generic targets:' 1780 @echo ' all - Build all targets marked with [*]' 1781 @echo '* vmlinux - Build the bare kernel' 1782 @echo '* modules - Build all modules' 1783 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1784 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1785 @echo ' dir/ - Build all files in dir and below' 1786 @echo ' dir/file.[ois] - Build specified target only' 1787 @echo ' dir/file.ll - Build the LLVM assembly file' 1788 @echo ' (requires compiler support for LLVM assembly generation)' 1789 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1790 @echo ' (requires a recent binutils and recent build (System.map))' 1791 @echo ' dir/file.ko - Build module including final link' 1792 @echo ' modules_prepare - Set up for building external modules' 1793 @echo ' tags/TAGS - Generate tags file for editors' 1794 @echo ' cscope - Generate cscope index' 1795 @echo ' gtags - Generate GNU GLOBAL index' 1796 @echo ' kernelrelease - Output the release version string (use with make -s)' 1797 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1798 @echo ' image_name - Output the image name (use with make -s)' 1799 @echo ' headers - Build ready-to-install UAPI headers in usr/include' 1800 @echo ' headers_install - Install sanitised kernel UAPI headers to INSTALL_HDR_PATH'; \ 1801 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1802 echo '' 1803 @echo 'Static analysers:' 1804 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1805 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1806 @echo ' versioncheck - Sanity check on version.h usage' 1807 @echo ' includecheck - Check for duplicate included header files' 1808 @echo ' headerdep - Detect inclusion cycles in headers' 1809 @echo ' coccicheck - Check with Coccinelle' 1810 @echo ' kconfig-sym-check - Check for dangling Kconfig symbol references' 1811 @echo ' clang-analyzer - Check with clang static analyzer' 1812 @echo ' clang-tidy - Check with clang-tidy' 1813 @echo '' 1814 @echo 'Tools:' 1815 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1816 @echo '' 1817 @echo 'Kernel selftest:' 1818 @echo ' kselftest - Build and run kernel selftest' 1819 @echo ' Build, install, and boot kernel before' 1820 @echo ' running kselftest on it' 1821 @echo ' Run as root for full coverage' 1822 @echo ' kselftest-all - Build kernel selftest' 1823 @echo ' kselftest-install - Build and install kernel selftest' 1824 @echo ' kselftest-clean - Remove all generated kselftest files' 1825 @echo ' kselftest-merge - Merge all the config dependencies of' 1826 @echo ' kselftest to existing .config.' 1827 @echo '' 1828 @echo 'Rust targets:' 1829 @echo ' rustavailable - Checks whether the Rust toolchain is' 1830 @echo ' available and, if not, explains why.' 1831 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1832 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1833 @echo ' is formatted, printing a diff otherwise.' 1834 @echo ' rustdoc - Generate Rust documentation' 1835 @echo ' (requires kernel .config)' 1836 @echo ' rusttest - Runs the Rust tests' 1837 @echo ' (requires kernel .config; downloads external repos)' 1838 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1839 @echo ' (requires kernel .config)' 1840 @echo ' dir/file.[os] - Build specified target only' 1841 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1842 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1843 @echo ' The output is not intended to be compilable.' 1844 @echo ' dir/file.ll - Build the LLVM assembly file' 1845 @echo '' 1846 @$(if $(dtstree), \ 1847 echo 'Devicetree:'; \ 1848 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1849 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1850 echo ' dt_binding_check - Validate device tree binding documents and examples'; \ 1851 echo ' dt_binding_schemas - Build processed device tree binding schemas'; \ 1852 echo ' dtbs_check - Validate device tree source files';\ 1853 echo '') 1854 1855 @echo 'Userspace tools targets:' 1856 @echo ' use "make tools/help"' 1857 @echo ' or "cd tools; make help"' 1858 @echo '' 1859 @echo 'Kernel packaging:' 1860 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1861 @echo '' 1862 @echo 'Documentation targets:' 1863 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1864 @echo '' 1865 @echo 'Architecture-specific targets ($(SRCARCH)):' 1866 @$(or $(archhelp),\ 1867 echo ' No architecture-specific help defined for $(SRCARCH)') 1868 @echo '' 1869 @$(if $(boards), \ 1870 $(foreach b, $(boards), \ 1871 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1872 echo '') 1873 @$(if $(board-dirs), \ 1874 $(foreach b, $(board-dirs), \ 1875 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1876 printf " %-16s - Show all of the above\\n" help-boards; \ 1877 echo '') 1878 1879 @echo ' make V=n [targets] 1: verbose build' 1880 @echo ' 2: give reason for rebuild of target' 1881 @echo ' V=1 and V=2 can be combined with V=12' 1882 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1883 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1884 @echo ' (sparse by default)' 1885 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1886 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1887 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where' 1888 @echo ' 1: warnings which may be relevant and do not occur too often' 1889 @echo ' 2: warnings which occur quite often but may still be relevant' 1890 @echo ' 3: more obscure warnings, can most likely be ignored' 1891 @echo ' c: extra checks in the configuration stage (Kconfig)' 1892 @echo ' e: warnings are being treated as errors' 1893 @echo ' Multiple levels can be combined with W=12 or W=123' 1894 @echo ' make UT=1 [targets] Warn if a tracepoint is defined but not used.' 1895 @echo ' [ This will be removed when all current unused tracepoints are eliminated. ]' 1896 @$(if $(dtstree), \ 1897 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1898 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1899 ) 1900 @echo '' 1901 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1902 @echo 'For further info see the ./README file' 1903 1904 1905help-board-dirs := $(addprefix help-,$(board-dirs)) 1906 1907help-boards: $(help-board-dirs) 1908 1909boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1910 1911$(help-board-dirs): help-%: 1912 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1913 @$(if $(boards-per-dir), \ 1914 $(foreach b, $(boards-per-dir), \ 1915 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1916 echo '') 1917 1918 1919# Documentation targets 1920# --------------------------------------------------------------------------- 1921DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1922 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs mandocs \ 1923 htmldocs-redirects 1924 1925PHONY += $(DOC_TARGETS) 1926$(DOC_TARGETS): 1927 $(Q)$(MAKE) $(build)=Documentation $@ 1928 1929 1930# Rust targets 1931# --------------------------------------------------------------------------- 1932 1933# "Is Rust available?" target 1934PHONY += rustavailable 1935rustavailable: 1936 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1937 1938# Documentation target 1939# 1940# Using the singular to avoid running afoul of `no-dot-config-targets`. 1941PHONY += rustdoc 1942rustdoc: prepare 1943 $(Q)$(MAKE) $(build)=rust $@ 1944 1945# Testing target 1946PHONY += rusttest 1947rusttest: prepare 1948 $(Q)$(MAKE) $(build)=rust $@ 1949 1950# Formatting targets 1951# 1952# Generated files as well as vendored crates are skipped. 1953PHONY += rustfmt rustfmtcheck 1954 1955rustfmt: 1956 $(Q)find $(srctree) $(RCS_FIND_IGNORE) \ 1957 \( \ 1958 -path $(srctree)/rust/proc-macro2 \ 1959 -o -path $(srctree)/rust/quote \ 1960 -o -path $(srctree)/rust/syn \ 1961 \) -prune -o \ 1962 -type f -a -name '*.rs' -a ! -name '*generated*' -print \ 1963 | xargs $(RUSTFMT) $(rustfmt_flags) 1964 1965rustfmtcheck: rustfmt_flags = --check 1966rustfmtcheck: rustfmt 1967 1968# Misc 1969# --------------------------------------------------------------------------- 1970 1971PHONY += misc-check 1972misc-check: 1973 $(Q)$(srctree)/scripts/misc-check 1974 1975all: misc-check 1976 1977PHONY += scripts_gdb 1978scripts_gdb: prepare0 1979 $(Q)$(MAKE) $(build)=scripts/gdb 1980 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1981 1982ifdef CONFIG_GDB_SCRIPTS 1983all: scripts_gdb 1984endif 1985 1986else # KBUILD_EXTMOD 1987 1988filechk_kernel.release = echo $(KERNELRELEASE) 1989 1990### 1991# External module support. 1992# When building external modules the kernel used as basis is considered 1993# read-only, and no consistency checks are made and the make 1994# system is not used on the basis kernel. If updates are required 1995# in the basis kernel ordinary make commands (without M=...) must be used. 1996 1997# We are always building only modules. 1998KBUILD_BUILTIN := 1999KBUILD_MODULES := y 2000 2001build-dir := . 2002 2003clean-dirs := . 2004clean: private rm-files := Module.symvers modules.nsdeps compile_commands.json 2005 2006PHONY += prepare 2007# now expand this into a simple variable to reduce the cost of shell evaluations 2008prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 2009prepare: PAHOLE_VERSION := $(PAHOLE_VERSION) 2010prepare: 2011 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 2012 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 2013 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 2014 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 2015 fi 2016 @if [ "$(PAHOLE_VERSION)" != "$(CONFIG_PAHOLE_VERSION)" ]; then \ 2017 echo >&2 "warning: pahole version differs from the one used to build the kernel"; \ 2018 echo >&2 " The kernel was built with: $(CONFIG_PAHOLE_VERSION)"; \ 2019 echo >&2 " You are using: $(PAHOLE_VERSION)"; \ 2020 fi 2021 2022PHONY += help 2023help: 2024 @echo ' Building external modules.' 2025 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 2026 @echo '' 2027 @echo ' modules - default target, build the module(s)' 2028 @echo ' modules_install - install the module' 2029 @echo ' clean - remove generated files in module directory only' 2030 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 2031 @echo '' 2032 2033ifndef CONFIG_MODULES 2034modules modules_install: __external_modules_error 2035__external_modules_error: 2036 @echo >&2 '***' 2037 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 2038 @echo >&2 '*** You cannot build or install external modules.' 2039 @echo >&2 '***' 2040 @false 2041endif 2042 2043endif # KBUILD_EXTMOD 2044 2045# --------------------------------------------------------------------------- 2046# Modules 2047 2048PHONY += modules modules_install modules_sign modules_prepare 2049 2050modules_install: 2051 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 2052 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 2053 2054ifeq ($(CONFIG_MODULE_SIG),y) 2055# modules_sign is a subset of modules_install. 2056# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 2057modules_sign: modules_install 2058 @: 2059else 2060modules_sign: 2061 @echo >&2 '***' 2062 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 2063 @echo >&2 '***' 2064 @false 2065endif 2066 2067ifdef CONFIG_MODULES 2068 2069modules.order: $(build-dir) 2070 @: 2071 2072# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 2073# This is solely useful to speed up test compiles. 2074modules: modpost 2075ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2076 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2077endif 2078 2079PHONY += modules_check 2080modules_check: modules.order 2081 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 2082 2083else # CONFIG_MODULES 2084 2085modules: 2086 @: 2087 2088KBUILD_MODULES := 2089 2090endif # CONFIG_MODULES 2091 2092PHONY += modpost 2093modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 2094 $(if $(KBUILD_MODULES), modules_check) 2095 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2096 2097# Single targets 2098# --------------------------------------------------------------------------- 2099# To build individual files in subdirectories, you can do like this: 2100# 2101# make foo/bar/baz.s 2102# 2103# The supported suffixes for single-target are listed in 'single-targets' 2104# 2105# To build only under specific subdirectories, you can do like this: 2106# 2107# make foo/bar/baz/ 2108 2109ifdef single-build 2110 2111# .ko is special because modpost is needed 2112single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 2113single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 2114 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 2115 2116$(single-ko): single_modules 2117 @: 2118$(single-no-ko): $(build-dir) 2119 @: 2120 2121# Remove modules.order when done because it is not the real one. 2122PHONY += single_modules 2123single_modules: $(single-no-ko) modules_prepare 2124 $(Q){ $(foreach m, $(single-ko), echo $(m:%.ko=%.o);) } > modules.order 2125 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 2126ifneq ($(KBUILD_MODPOST_NOFINAL),1) 2127 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 2128endif 2129 $(Q)rm -f modules.order 2130 2131single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 2132 2133KBUILD_MODULES := y 2134 2135endif 2136 2137prepare: outputmakefile 2138 2139# Preset locale variables to speed up the build process. Limit locale 2140# tweaks to this spot to avoid wrong language settings when running 2141# make menuconfig etc. 2142# Error messages still appears in the original language 2143PHONY += $(build-dir) 2144$(build-dir): prepare 2145 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 2146 2147clean-dirs := $(addprefix _clean_, $(clean-dirs)) 2148PHONY += $(clean-dirs) clean 2149$(clean-dirs): 2150 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 2151 2152clean: $(clean-dirs) 2153 $(call cmd,rmfiles) 2154 @find . $(RCS_FIND_IGNORE) \ 2155 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 2156 -o -name '*.ko.*' -o -name '*.o.thinlto.bc' \ 2157 -o -name '*.dtb' -o -name '*.dtbo' \ 2158 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 2159 -o -name '*.dt.yaml' -o -name 'dtbs-list' \ 2160 -o -name '*.dwo' -o -name '*.lst' \ 2161 -o -name '*.su' -o -name '*.mod' \ 2162 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 2163 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 2164 -o -name '*.asn1.[ch]' \ 2165 -o -name '*.symtypes' -o -name 'modules.order' \ 2166 -o -name '*.c.[012]*.*' \ 2167 -o -name '*.ll' \ 2168 -o -name '*.gcno' \ 2169 \) -type f -print \ 2170 -o -name '.tmp_*' -print \ 2171 | xargs rm -rf 2172 2173# Generate tags for editors 2174# --------------------------------------------------------------------------- 2175quiet_cmd_tags = GEN $@ 2176 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 2177 2178tags TAGS cscope gtags: FORCE 2179 $(call cmd,tags) 2180 2181# Generate rust-project.json (a file that describes the structure of non-Cargo 2182# Rust projects) for rust-analyzer (an implementation of the Language Server 2183# Protocol). 2184PHONY += rust-analyzer 2185rust-analyzer: 2186 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 2187ifdef KBUILD_EXTMOD 2188# FIXME: external modules must not descend into a sub-directory of the kernel 2189 $(Q)$(MAKE) $(build)=$(objtree)/rust src=$(srctree)/rust $@ 2190else 2191 $(Q)$(MAKE) $(build)=rust $@ 2192endif 2193 2194# Script to generate missing namespace dependencies 2195# --------------------------------------------------------------------------- 2196 2197PHONY += nsdeps 2198nsdeps: export KBUILD_NSDEPS=1 2199nsdeps: modules 2200 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 2201 2202# Clang Tooling 2203# --------------------------------------------------------------------------- 2204 2205quiet_cmd_gen_compile_commands = GEN $@ 2206 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2207 2208compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \ 2209 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2210 $(if $(CONFIG_MODULES), modules.order) FORCE 2211 $(call if_changed,gen_compile_commands) 2212 2213targets += compile_commands.json 2214 2215PHONY += clang-tidy clang-analyzer 2216 2217ifdef CONFIG_CC_IS_CLANG 2218quiet_cmd_clang_tools = CHECK $< 2219 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2220 2221clang-tidy clang-analyzer: compile_commands.json 2222 $(call cmd,clang_tools) 2223else 2224clang-tidy clang-analyzer: 2225 @echo "$@ requires CC=clang" >&2 2226 @false 2227endif 2228 2229# Scripts to check various things for consistency 2230# --------------------------------------------------------------------------- 2231 2232PHONY += includecheck versioncheck coccicheck kconfig-sym-check 2233 2234includecheck: 2235 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2236 -name '*.[hcS]' -type f -print | sort \ 2237 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2238 2239versioncheck: 2240 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2241 -name '*.[hcS]' -type f -print | sort \ 2242 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2243 2244coccicheck: 2245 $(Q)$(BASH) $(srctree)/scripts/$@ 2246 2247kconfig-sym-check: 2248 $(Q)$(PERL) $(srctree)/scripts/kconfig/kconfig-sym-check.pl $(srctree) $(KCONFIG_SYM_CHECK_EXCLUDES) 2249 2250PHONY += checkstack kernelrelease kernelversion image_name 2251 2252# UML needs a little special treatment here. It wants to use the host 2253# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2254# else wants $(ARCH), including people doing cross-builds, which means 2255# that $(SUBARCH) doesn't work here. 2256ifeq ($(ARCH), um) 2257CHECKSTACK_ARCH := $(SUBARCH) 2258else 2259CHECKSTACK_ARCH := $(ARCH) 2260endif 2261MINSTACKSIZE ?= 100 2262checkstack: 2263 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2264 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2265 2266kernelrelease: 2267 @$(filechk_kernel.release) 2268 2269kernelversion: 2270 @echo $(KERNELVERSION) 2271 2272image_name: 2273 @echo $(KBUILD_IMAGE) 2274 2275PHONY += run-command 2276run-command: 2277 $(Q)$(KBUILD_RUN_COMMAND) 2278 2279quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2280 cmd_rmfiles = rm -rf $(rm-files) 2281 2282# read saved command lines for existing targets 2283existing-targets := $(wildcard $(sort $(targets))) 2284 2285-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2286 2287endif # config-build 2288endif # mixed-build 2289endif # need-sub-make 2290 2291PHONY += FORCE 2292FORCE: 2293 2294# Declare the contents of the PHONY variable as phony. We keep that 2295# information in a variable so we can use it in if_changed and friends. 2296.PHONY: $(PHONY) 2297