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