1# SPDX-License-Identifier: GPL-2.0 2VERSION = 6 3PATCHLEVEL = 12 4SUBLEVEL = 0 5EXTRAVERSION = 6NAME = Baby Opossum Posse 7 8# *DOCUMENTATION* 9# To see a list of typical targets execute "make help" 10# More info can be located in ./README 11# Comments in this file are targeted only to the developer, do not 12# expect to learn how to build the kernel reading this file. 13 14ifeq ($(filter output-sync,$(.FEATURES)),) 15$(error GNU Make >= 4.0 is required. Your Make version is $(MAKE_VERSION)) 16endif 17 18$(if $(filter __%, $(MAKECMDGOALS)), \ 19 $(error targets prefixed with '__' are only for internal use)) 20 21# That's our default target when none is given on the command line 22PHONY := __all 23__all: 24 25# We are using a recursive build, so we need to do a little thinking 26# to get the ordering right. 27# 28# Most importantly: sub-Makefiles should only ever modify files in 29# their own directory. If in some directory we have a dependency on 30# a file in another dir (which doesn't happen often, but it's often 31# unavoidable when linking the built-in.a targets which finally 32# turn into vmlinux), we will call a sub make in that other dir, and 33# after that we are sure that everything which is in that other dir 34# is now up to date. 35# 36# The only cases where we need to modify files which have global 37# effects are thus separated out and done before the recursive 38# descending is started. They are now explicitly listed as the 39# prepare rule. 40 41this-makefile := $(lastword $(MAKEFILE_LIST)) 42abs_srctree := $(realpath $(dir $(this-makefile))) 43abs_objtree := $(CURDIR) 44 45ifneq ($(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 := $(M) 135endif 136 137$(if $(word 2, $(KBUILD_EXTMOD)), \ 138 $(error building multiple external modules is not supported)) 139 140$(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \ 141 $(error module directory path cannot contain '$x'))) 142 143# Remove trailing slashes 144ifneq ($(filter %/, $(KBUILD_EXTMOD)),) 145KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) 146endif 147 148export KBUILD_EXTMOD 149 150# backward compatibility 151KBUILD_EXTRA_WARN ?= $(KBUILD_ENABLE_EXTRA_GCC_CHECKS) 152 153ifeq ("$(origin W)", "command line") 154 KBUILD_EXTRA_WARN := $(W) 155endif 156 157export KBUILD_EXTRA_WARN 158 159# Kbuild will save output files in the current working directory. 160# This does not need to match to the root of the kernel source tree. 161# 162# For example, you can do this: 163# 164# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 165# 166# If you want to save output files in a different location, there are 167# two syntaxes to specify it. 168# 169# 1) O= 170# Use "make O=dir/to/store/output/files/" 171# 172# 2) Set KBUILD_OUTPUT 173# Set the environment variable KBUILD_OUTPUT to point to the output directory. 174# export KBUILD_OUTPUT=dir/to/store/output/files/; make 175# 176# The O= assignment takes precedence over the KBUILD_OUTPUT environment 177# variable. 178 179# Do we want to change the working directory? 180ifeq ("$(origin O)", "command line") 181 KBUILD_OUTPUT := $(O) 182endif 183 184ifneq ($(KBUILD_OUTPUT),) 185# $(realpath ...) gets empty if the path does not exist. Run 'mkdir -p' first. 186$(shell mkdir -p "$(KBUILD_OUTPUT)") 187# $(realpath ...) resolves symlinks 188abs_objtree := $(realpath $(KBUILD_OUTPUT)) 189$(if $(abs_objtree),,$(error failed to create output directory "$(KBUILD_OUTPUT)")) 190endif # ifneq ($(KBUILD_OUTPUT),) 191 192ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 193$(error source directory cannot contain spaces or colons) 194endif 195 196export sub_make_done := 1 197 198endif # sub_make_done 199 200ifeq ($(abs_objtree),$(CURDIR)) 201# Suppress "Entering directory ..." if we are at the final work directory. 202no-print-directory := --no-print-directory 203else 204# Recursion to show "Entering directory ..." 205need-sub-make := 1 206endif 207 208ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),) 209# If --no-print-directory is unset, recurse once again to set it. 210# You may end up recursing into __sub-make twice. This is needed due to the 211# behavior change in GNU Make 4.4.1. 212need-sub-make := 1 213endif 214 215ifeq ($(need-sub-make),1) 216 217PHONY += $(MAKECMDGOALS) __sub-make 218 219$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 220 @: 221 222# Invoke a second make in the output directory, passing relevant variables 223__sub-make: 224 $(Q)$(MAKE) $(no-print-directory) -C $(abs_objtree) \ 225 -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 226 227else # need-sub-make 228 229# We process the rest of the Makefile if this is the final invocation of make 230 231ifeq ($(abs_srctree),$(abs_objtree)) 232 # building in the source tree 233 srctree := . 234 building_out_of_srctree := 235else 236 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 237 # building in a subdirectory of the source tree 238 srctree := .. 239 else 240 srctree := $(abs_srctree) 241 endif 242 building_out_of_srctree := 1 243endif 244 245ifneq ($(KBUILD_ABS_SRCTREE),) 246srctree := $(abs_srctree) 247endif 248 249objtree := . 250 251VPATH := 252 253ifeq ($(KBUILD_EXTMOD),) 254ifdef building_out_of_srctree 255VPATH := $(srctree) 256endif 257endif 258 259export building_out_of_srctree srctree objtree VPATH 260 261# To make sure we do not include .config for any of the *config targets 262# catch them early, and hand them over to scripts/kconfig/Makefile 263# It is allowed to specify more targets when calling make, including 264# mixing *config targets and build targets. 265# For example 'make oldconfig all'. 266# Detect when mixed targets is specified, and make a second invocation 267# of make so .config is not included in this case either (for *config). 268 269version_h := include/generated/uapi/linux/version.h 270 271clean-targets := %clean mrproper cleandocs 272no-dot-config-targets := $(clean-targets) \ 273 cscope gtags TAGS tags help% %docs check% coccicheck \ 274 $(version_h) headers headers_% archheaders archscripts \ 275 %asm-generic kernelversion %src-pkg dt_binding_check \ 276 outputmakefile rustavailable rustfmt rustfmtcheck 277no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \ 278 image_name 279single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/ 280 281config-build := 282mixed-build := 283need-config := 1 284may-sync-config := 1 285single-build := 286 287ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 288 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 289 need-config := 290 endif 291endif 292 293ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 294 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 295 may-sync-config := 296 endif 297endif 298 299need-compiler := $(may-sync-config) 300 301ifneq ($(KBUILD_EXTMOD),) 302 may-sync-config := 303endif 304 305ifeq ($(KBUILD_EXTMOD),) 306 ifneq ($(filter %config,$(MAKECMDGOALS)),) 307 config-build := 1 308 ifneq ($(words $(MAKECMDGOALS)),1) 309 mixed-build := 1 310 endif 311 endif 312endif 313 314# We cannot build single targets and the others at the same time 315ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 316 single-build := 1 317 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 318 mixed-build := 1 319 endif 320endif 321 322# For "make -j clean all", "make -j mrproper defconfig all", etc. 323ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 324 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 325 mixed-build := 1 326 endif 327endif 328 329# install and modules_install need also be processed one by one 330ifneq ($(filter install,$(MAKECMDGOALS)),) 331 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 332 mixed-build := 1 333 endif 334endif 335 336ifdef mixed-build 337# =========================================================================== 338# We're called with mixed targets (*config and build targets). 339# Handle them one by one. 340 341PHONY += $(MAKECMDGOALS) __build_one_by_one 342 343$(MAKECMDGOALS): __build_one_by_one 344 @: 345 346__build_one_by_one: 347 $(Q)set -e; \ 348 for i in $(MAKECMDGOALS); do \ 349 $(MAKE) -f $(srctree)/Makefile $$i; \ 350 done 351 352else # !mixed-build 353 354include $(srctree)/scripts/Kbuild.include 355 356# Read KERNELRELEASE from include/config/kernel.release (if it exists) 357KERNELRELEASE = $(call read-file, include/config/kernel.release) 358KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 359export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 360 361include $(srctree)/scripts/subarch.include 362 363# Cross compiling and selecting different set of gcc/bin-utils 364# --------------------------------------------------------------------------- 365# 366# When performing cross compilation for other architectures ARCH shall be set 367# to the target architecture. (See arch/* for the possibilities). 368# ARCH can be set during invocation of make: 369# make ARCH=arm64 370# Another way is to have ARCH set in the environment. 371# The default ARCH is the host where make is executed. 372 373# CROSS_COMPILE specify the prefix used for all executables used 374# during compilation. Only gcc and related bin-utils executables 375# are prefixed with $(CROSS_COMPILE). 376# CROSS_COMPILE can be set on the command line 377# make CROSS_COMPILE=aarch64-linux-gnu- 378# Alternatively CROSS_COMPILE can be set in the environment. 379# Default value for CROSS_COMPILE is not to prefix executables 380# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 381ARCH ?= $(SUBARCH) 382 383# Architecture as present in compile.h 384UTS_MACHINE := $(ARCH) 385SRCARCH := $(ARCH) 386 387# Additional ARCH settings for x86 388ifeq ($(ARCH),i386) 389 SRCARCH := x86 390endif 391ifeq ($(ARCH),x86_64) 392 SRCARCH := x86 393endif 394 395# Additional ARCH settings for sparc 396ifeq ($(ARCH),sparc32) 397 SRCARCH := sparc 398endif 399ifeq ($(ARCH),sparc64) 400 SRCARCH := sparc 401endif 402 403# Additional ARCH settings for parisc 404ifeq ($(ARCH),parisc64) 405 SRCARCH := parisc 406endif 407 408export cross_compiling := 409ifneq ($(SRCARCH),$(SUBARCH)) 410cross_compiling := 1 411endif 412 413KCONFIG_CONFIG ?= .config 414export KCONFIG_CONFIG 415 416# SHELL used by kbuild 417CONFIG_SHELL := sh 418 419HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 420HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 421HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 422 423ifneq ($(LLVM),) 424ifneq ($(filter %/,$(LLVM)),) 425LLVM_PREFIX := $(LLVM) 426else ifneq ($(filter -%,$(LLVM)),) 427LLVM_SUFFIX := $(LLVM) 428endif 429 430HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 431HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 432else 433HOSTCC = gcc 434HOSTCXX = g++ 435endif 436HOSTRUSTC = rustc 437HOSTPKG_CONFIG = pkg-config 438 439KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 440 -O2 -fomit-frame-pointer -std=gnu11 441KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 442KBUILD_USERLDFLAGS := $(USERLDFLAGS) 443 444# These flags apply to all Rust code in the tree, including the kernel and 445# host programs. 446export rust_common_flags := --edition=2021 \ 447 -Zbinary_dep_depinfo=y \ 448 -Astable_features \ 449 -Dnon_ascii_idents \ 450 -Dunsafe_op_in_unsafe_fn \ 451 -Wmissing_docs \ 452 -Wrust_2018_idioms \ 453 -Wunreachable_pub \ 454 -Wclippy::all \ 455 -Wclippy::ignored_unit_patterns \ 456 -Wclippy::mut_mut \ 457 -Wclippy::needless_bitwise_bool \ 458 -Wclippy::needless_continue \ 459 -Aclippy::needless_lifetimes \ 460 -Wclippy::no_mangle_with_rust_abi \ 461 -Wclippy::undocumented_unsafe_blocks \ 462 -Wclippy::unnecessary_safety_comment \ 463 -Wclippy::unnecessary_safety_doc \ 464 -Wrustdoc::missing_crate_level_docs \ 465 -Wrustdoc::unescaped_backticks 466 467KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \ 468 $(HOSTCFLAGS) -I $(srctree)/scripts/include 469KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \ 470 -I $(srctree)/scripts/include 471KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 472 -Zallow-features= $(HOSTRUSTFLAGS) 473KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 474KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 475 476# Make variables (CC, etc...) 477CPP = $(CC) -E 478ifneq ($(LLVM),) 479CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 480LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 481AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 482NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 483OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 484OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 485READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 486STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 487else 488CC = $(CROSS_COMPILE)gcc 489LD = $(CROSS_COMPILE)ld 490AR = $(CROSS_COMPILE)ar 491NM = $(CROSS_COMPILE)nm 492OBJCOPY = $(CROSS_COMPILE)objcopy 493OBJDUMP = $(CROSS_COMPILE)objdump 494READELF = $(CROSS_COMPILE)readelf 495STRIP = $(CROSS_COMPILE)strip 496endif 497RUSTC = rustc 498RUSTDOC = rustdoc 499RUSTFMT = rustfmt 500CLIPPY_DRIVER = clippy-driver 501BINDGEN = bindgen 502PAHOLE = pahole 503RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 504LEX = flex 505YACC = bison 506AWK = awk 507INSTALLKERNEL := installkernel 508PERL = perl 509PYTHON3 = python3 510CHECK = sparse 511BASH = bash 512KGZIP = gzip 513KBZIP2 = bzip2 514KLZOP = lzop 515LZMA = lzma 516LZ4 = lz4c 517XZ = xz 518ZSTD = zstd 519 520CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 521 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 522NOSTDINC_FLAGS := 523CFLAGS_MODULE = 524RUSTFLAGS_MODULE = 525AFLAGS_MODULE = 526LDFLAGS_MODULE = 527CFLAGS_KERNEL = 528RUSTFLAGS_KERNEL = 529AFLAGS_KERNEL = 530LDFLAGS_vmlinux = 531 532# Use USERINCLUDE when you must reference the UAPI directories only. 533USERINCLUDE := \ 534 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 535 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 536 -I$(srctree)/include/uapi \ 537 -I$(objtree)/include/generated/uapi \ 538 -include $(srctree)/include/linux/compiler-version.h \ 539 -include $(srctree)/include/linux/kconfig.h 540 541# Use LINUXINCLUDE when you must reference the include/ directory. 542# Needed to be compatible with the O= option 543LINUXINCLUDE := \ 544 -I$(srctree)/arch/$(SRCARCH)/include \ 545 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 546 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 547 -I$(objtree)/include \ 548 $(USERINCLUDE) 549 550KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 551 552KBUILD_CFLAGS := 553KBUILD_CFLAGS += -std=gnu11 554KBUILD_CFLAGS += -fshort-wchar 555KBUILD_CFLAGS += -funsigned-char 556KBUILD_CFLAGS += -fno-common 557KBUILD_CFLAGS += -fno-PIE 558KBUILD_CFLAGS += -fno-strict-aliasing 559 560KBUILD_CPPFLAGS := -D__KERNEL__ 561KBUILD_RUSTFLAGS := $(rust_common_flags) \ 562 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 563 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 564 -Csymbol-mangling-version=v0 \ 565 -Crelocation-model=static \ 566 -Zfunction-sections=n \ 567 -Wclippy::float_arithmetic 568 569KBUILD_AFLAGS_KERNEL := 570KBUILD_CFLAGS_KERNEL := 571KBUILD_RUSTFLAGS_KERNEL := 572KBUILD_AFLAGS_MODULE := -DMODULE 573KBUILD_CFLAGS_MODULE := -DMODULE 574KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 575KBUILD_LDFLAGS_MODULE := 576KBUILD_LDFLAGS := 577CLANG_FLAGS := 578 579ifeq ($(KBUILD_CLIPPY),1) 580 RUSTC_OR_CLIPPY_QUIET := CLIPPY 581 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 582else 583 RUSTC_OR_CLIPPY_QUIET := RUSTC 584 RUSTC_OR_CLIPPY = $(RUSTC) 585endif 586 587# Allows the usage of unstable features in stable compilers. 588export RUSTC_BOOTSTRAP := 1 589 590# Allows finding `.clippy.toml` in out-of-srctree builds. 591export CLIPPY_CONF_DIR := $(srctree) 592 593export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 594export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN 595export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 596export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 597export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 598export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 599export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 600export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 601 602export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 603export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 604export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 605export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 606export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 607export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 608 609# Files to ignore in find ... statements 610 611export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 612 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 613 -prune -o 614 615# =========================================================================== 616# Rules shared between *config targets and build targets 617 618# Basic helpers built in scripts/basic/ 619PHONY += scripts_basic 620scripts_basic: 621 $(Q)$(MAKE) $(build)=scripts/basic 622 623PHONY += outputmakefile 624ifdef building_out_of_srctree 625# Before starting out-of-tree build, make sure the source tree is clean. 626# outputmakefile generates a Makefile in the output directory, if using a 627# separate output directory. This allows convenient use of make in the 628# output directory. 629# At the same time when output Makefile generated, generate .gitignore to 630# ignore whole output directory 631 632quiet_cmd_makefile = GEN Makefile 633 cmd_makefile = { \ 634 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 635 echo "include $(srctree)/Makefile"; \ 636 } > Makefile 637 638outputmakefile: 639 @if [ -f $(srctree)/.config -o \ 640 -d $(srctree)/include/config -o \ 641 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 642 echo >&2 "***"; \ 643 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 644 echo >&2 "*** in $(abs_srctree)";\ 645 echo >&2 "***"; \ 646 false; \ 647 fi 648 $(Q)ln -fsn $(srctree) source 649 $(call cmd,makefile) 650 $(Q)test -e .gitignore || \ 651 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 652endif 653 654# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 655# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 656# CC_VERSION_TEXT and RUSTC_VERSION_TEXT are referenced from Kconfig (so they 657# need export), and from include/config/auto.conf.cmd to detect the compiler 658# upgrade. 659CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 660RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null)) 661 662ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 663include $(srctree)/scripts/Makefile.clang 664endif 665 666# Include this also for config targets because some architectures need 667# cc-cross-prefix to determine CROSS_COMPILE. 668ifdef need-compiler 669include $(srctree)/scripts/Makefile.compiler 670endif 671 672ifdef config-build 673# =========================================================================== 674# *config targets only - make sure prerequisites are updated, and descend 675# in scripts/kconfig to make the *config target 676 677# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 678# KBUILD_DEFCONFIG may point out an alternative default configuration 679# used for 'make defconfig' 680include $(srctree)/arch/$(SRCARCH)/Makefile 681export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT RUSTC_VERSION_TEXT 682 683config: outputmakefile scripts_basic FORCE 684 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 685 686%config: outputmakefile scripts_basic FORCE 687 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 688 689else #!config-build 690# =========================================================================== 691# Build targets only - this includes vmlinux, arch-specific targets, clean 692# targets and others. In general all targets except *config targets. 693 694# If building an external module we do not care about the all: rule 695# but instead __all depend on modules 696PHONY += all 697ifeq ($(KBUILD_EXTMOD),) 698__all: all 699else 700__all: modules 701endif 702 703targets := 704 705# Decide whether to build built-in, modular, or both. 706# Normally, just do built-in. 707 708KBUILD_MODULES := 709KBUILD_BUILTIN := 1 710 711# If we have only "make modules", don't compile built-in objects. 712ifeq ($(MAKECMDGOALS),modules) 713 KBUILD_BUILTIN := 714endif 715 716# If we have "make <whatever> modules", compile modules 717# in addition to whatever we do anyway. 718# Just "make" or "make all" shall build modules as well 719 720ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 721 KBUILD_MODULES := 1 722endif 723 724ifeq ($(MAKECMDGOALS),) 725 KBUILD_MODULES := 1 726endif 727 728export KBUILD_MODULES KBUILD_BUILTIN 729 730ifdef need-config 731include include/config/auto.conf 732endif 733 734ifeq ($(KBUILD_EXTMOD),) 735# Objects we will link into vmlinux / subdirs we need to visit 736core-y := 737drivers-y := 738libs-y := lib/ 739endif # KBUILD_EXTMOD 740 741# The all: target is the default when no target is given on the 742# command line. 743# This allow a user to issue only 'make' to build a kernel including modules 744# Defaults to vmlinux, but the arch makefile usually adds further targets 745all: vmlinux 746 747CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 748ifdef CONFIG_CC_IS_GCC 749CFLAGS_GCOV += -fno-tree-loop-im 750endif 751export CFLAGS_GCOV 752 753# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 754ifdef CONFIG_FUNCTION_TRACER 755 CC_FLAGS_FTRACE := -pg 756endif 757 758include $(srctree)/arch/$(SRCARCH)/Makefile 759 760ifdef need-config 761ifdef may-sync-config 762# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 763# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 764# because some architectures define CROSS_COMPILE there. 765include include/config/auto.conf.cmd 766 767$(KCONFIG_CONFIG): 768 @echo >&2 '***' 769 @echo >&2 '*** Configuration file "$@" not found!' 770 @echo >&2 '***' 771 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 772 @echo >&2 '*** "make menuconfig" or "make xconfig").' 773 @echo >&2 '***' 774 @/bin/false 775 776# The actual configuration files used during the build are stored in 777# include/generated/ and include/config/. Update them if .config is newer than 778# include/config/auto.conf (which mirrors .config). 779# 780# This exploits the 'multi-target pattern rule' trick. 781# The syncconfig should be executed only once to make all the targets. 782# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 783# 784# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 785# so you cannot notice that Kconfig is waiting for the user input. 786%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 787 $(Q)$(kecho) " SYNC $@" 788 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 789else # !may-sync-config 790# External modules and some install targets need include/generated/autoconf.h 791# and include/config/auto.conf but do not care if they are up-to-date. 792# Use auto.conf to trigger the test 793PHONY += include/config/auto.conf 794 795include/config/auto.conf: 796 @test -e include/generated/autoconf.h -a -e $@ || ( \ 797 echo >&2; \ 798 echo >&2 " ERROR: Kernel configuration is invalid."; \ 799 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 800 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 801 echo >&2 ; \ 802 /bin/false) 803 804endif # may-sync-config 805endif # need-config 806 807KBUILD_CFLAGS += -fno-delete-null-pointer-checks 808 809ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 810KBUILD_CFLAGS += -O2 811KBUILD_RUSTFLAGS += -Copt-level=2 812else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 813KBUILD_CFLAGS += -Os 814KBUILD_RUSTFLAGS += -Copt-level=s 815endif 816 817# Always set `debug-assertions` and `overflow-checks` because their default 818# depends on `opt-level` and `debug-assertions`, respectively. 819KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 820KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 821 822# Tell gcc to never replace conditional load with a non-conditional one 823ifdef CONFIG_CC_IS_GCC 824# gcc-10 renamed --param=allow-store-data-races=0 to 825# -fno-allow-store-data-races. 826KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 827KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 828endif 829 830ifdef CONFIG_READABLE_ASM 831# Disable optimizations that make assembler listings hard to read. 832# reorder blocks reorders the control in the function 833# ipa clone creates specialized cloned functions 834# partial inlining inlines only parts of functions 835KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 836endif 837 838stackp-flags-y := -fno-stack-protector 839stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 840stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 841 842KBUILD_CFLAGS += $(stackp-flags-y) 843 844KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings 845KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) 846 847ifdef CONFIG_FRAME_POINTER 848KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 849KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 850else 851# Some targets (ARM with Thumb2, for example), can't be built with frame 852# pointers. For those, we don't have FUNCTION_TRACER automatically 853# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 854# incompatible with -fomit-frame-pointer with current GCC, so we don't use 855# -fomit-frame-pointer with FUNCTION_TRACER. 856# In the Rust target specification, "frame-pointer" is set explicitly 857# to "may-omit". 858ifndef CONFIG_FUNCTION_TRACER 859KBUILD_CFLAGS += -fomit-frame-pointer 860endif 861endif 862 863# Initialize all stack variables with a 0xAA pattern. 864ifdef CONFIG_INIT_STACK_ALL_PATTERN 865KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 866endif 867 868# Initialize all stack variables with a zero value. 869ifdef CONFIG_INIT_STACK_ALL_ZERO 870KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 871ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 872# https://github.com/llvm/llvm-project/issues/44842 873CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 874export CC_AUTO_VAR_INIT_ZERO_ENABLER 875KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 876endif 877endif 878 879# While VLAs have been removed, GCC produces unreachable stack probes 880# for the randomize_kstack_offset feature. Disable it for all compilers. 881KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 882 883# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 884ifdef CONFIG_ZERO_CALL_USED_REGS 885KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 886endif 887 888ifdef CONFIG_FUNCTION_TRACER 889ifdef CONFIG_FTRACE_MCOUNT_USE_CC 890 CC_FLAGS_FTRACE += -mrecord-mcount 891 ifdef CONFIG_HAVE_NOP_MCOUNT 892 ifeq ($(call cc-option-yn, -mnop-mcount),y) 893 CC_FLAGS_FTRACE += -mnop-mcount 894 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 895 endif 896 endif 897endif 898ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 899 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 900 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 901 endif 902endif 903ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 904 ifdef CONFIG_HAVE_C_RECORDMCOUNT 905 BUILD_C_RECORDMCOUNT := y 906 export BUILD_C_RECORDMCOUNT 907 endif 908endif 909ifdef CONFIG_HAVE_FENTRY 910 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 911 ifeq ($(call cc-option-yn, -mfentry),y) 912 CC_FLAGS_FTRACE += -mfentry 913 CC_FLAGS_USING += -DCC_USING_FENTRY 914 endif 915endif 916export CC_FLAGS_FTRACE 917KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 918KBUILD_AFLAGS += $(CC_FLAGS_USING) 919endif 920 921# We trigger additional mismatches with less inlining 922ifdef CONFIG_DEBUG_SECTION_MISMATCH 923KBUILD_CFLAGS += -fno-inline-functions-called-once 924endif 925 926# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 927ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 928KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 929KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 930LDFLAGS_vmlinux += --gc-sections 931endif 932 933ifdef CONFIG_SHADOW_CALL_STACK 934ifndef CONFIG_DYNAMIC_SCS 935CC_FLAGS_SCS := -fsanitize=shadow-call-stack 936KBUILD_CFLAGS += $(CC_FLAGS_SCS) 937KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack 938endif 939export CC_FLAGS_SCS 940endif 941 942ifdef CONFIG_LTO_CLANG 943ifdef CONFIG_LTO_CLANG_THIN 944CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 945else 946CC_FLAGS_LTO := -flto 947endif 948CC_FLAGS_LTO += -fvisibility=hidden 949 950# Limit inlining across translation units to reduce binary size 951KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 952endif 953 954ifdef CONFIG_LTO 955KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 956KBUILD_AFLAGS += -fno-lto 957export CC_FLAGS_LTO 958endif 959 960ifdef CONFIG_CFI_CLANG 961CC_FLAGS_CFI := -fsanitize=kcfi 962ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS 963 CC_FLAGS_CFI += -fsanitize-cfi-icall-experimental-normalize-integers 964endif 965ifdef CONFIG_RUST 966 # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects 967 # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS. 968 RUSTC_FLAGS_CFI := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers 969 KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI) 970 export RUSTC_FLAGS_CFI 971endif 972KBUILD_CFLAGS += $(CC_FLAGS_CFI) 973export CC_FLAGS_CFI 974endif 975 976# Architectures can define flags to add/remove for floating-point support 977CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT 978export CC_FLAGS_FPU 979export CC_FLAGS_NO_FPU 980 981ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 982# Set the minimal function alignment. Use the newer GCC option 983# -fmin-function-alignment if it is available, or fall back to -falign-funtions. 984# See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. 985ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT 986KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) 987else 988KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 989endif 990endif 991 992# arch Makefile may override CC so keep this after arch Makefile is included 993NOSTDINC_FLAGS += -nostdinc 994 995# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 996# the kernel uses only C99 flexible arrays for dynamically sized trailing 997# arrays. Enforce this for everything that may examine structure sizes and 998# perform bounds checking. 999KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 1000 1001#Currently, disable -Wstringop-overflow for GCC 11, globally. 1002KBUILD_CFLAGS-$(CONFIG_CC_NO_STRINGOP_OVERFLOW) += $(call cc-option, -Wno-stringop-overflow) 1003KBUILD_CFLAGS-$(CONFIG_CC_STRINGOP_OVERFLOW) += $(call cc-option, -Wstringop-overflow) 1004 1005# disable invalid "can't wrap" optimizations for signed / pointers 1006KBUILD_CFLAGS += -fno-strict-overflow 1007 1008# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1009KBUILD_CFLAGS += -fno-stack-check 1010 1011# conserve stack if available 1012ifdef CONFIG_CC_IS_GCC 1013KBUILD_CFLAGS += -fconserve-stack 1014endif 1015 1016# change __FILE__ to the relative path from the srctree 1017KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1018 1019# include additional Makefiles when needed 1020include-y := scripts/Makefile.extrawarn 1021include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1022include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1023include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1024include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1025include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1026include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1027include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1028include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1029include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1030 1031include $(addprefix $(srctree)/, $(include-y)) 1032 1033# scripts/Makefile.gcc-plugins is intentionally included last. 1034# Do not add $(call cc-option,...) below this line. When you build the kernel 1035# from the clean source tree, the GCC plugins do not exist at this point. 1036 1037# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1038KBUILD_CPPFLAGS += $(KCPPFLAGS) 1039KBUILD_AFLAGS += $(KAFLAGS) 1040KBUILD_CFLAGS += $(KCFLAGS) 1041KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1042 1043KBUILD_LDFLAGS_MODULE += --build-id=sha1 1044LDFLAGS_vmlinux += --build-id=sha1 1045 1046KBUILD_LDFLAGS += -z noexecstack 1047ifeq ($(CONFIG_LD_IS_BFD),y) 1048KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1049endif 1050 1051ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1052LDFLAGS_vmlinux += -X 1053endif 1054 1055ifeq ($(CONFIG_RELR),y) 1056# ld.lld before 15 did not support -z pack-relative-relocs. 1057LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1058endif 1059 1060# We never want expected sections to be placed heuristically by the 1061# linker. All sections should be explicitly named in the linker script. 1062ifdef CONFIG_LD_ORPHAN_WARN 1063LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1064endif 1065 1066# Align the bit size of userspace programs with the kernel 1067KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1068KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1069 1070# make the checker run with the right architecture 1071CHECKFLAGS += --arch=$(ARCH) 1072 1073# insure the checker run with the right endianness 1074CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1075 1076# the checker needs the correct machine size 1077CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1078 1079# Default kernel image to build when no specific target is given. 1080# KBUILD_IMAGE may be overruled on the command line or 1081# set in the environment 1082# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1083# this default value 1084export KBUILD_IMAGE ?= vmlinux 1085 1086# 1087# INSTALL_PATH specifies where to place the updated kernel and system map 1088# images. Default is /boot, but you can set it to other values 1089export INSTALL_PATH ?= /boot 1090 1091# 1092# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1093# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1094# an argument if needed. Otherwise it defaults to the kernel install path 1095# 1096export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1097 1098# 1099# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1100# relocations required by build roots. This is not defined in the 1101# makefile but the argument can be passed to make if needed. 1102# 1103 1104MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1105export MODLIB 1106 1107PHONY += prepare0 1108 1109export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1110export MODORDER := $(extmod_prefix)modules.order 1111export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1112 1113ifeq ($(KBUILD_EXTMOD),) 1114 1115build-dir := . 1116clean-dirs := $(sort . Documentation \ 1117 $(patsubst %/,%,$(filter %/, $(core-) \ 1118 $(drivers-) $(libs-)))) 1119 1120export ARCH_CORE := $(core-y) 1121export ARCH_LIB := $(filter %/, $(libs-y)) 1122export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1123# Externally visible symbols (used by link-vmlinux.sh) 1124 1125KBUILD_VMLINUX_OBJS := ./built-in.a 1126ifdef CONFIG_MODULES 1127KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1128KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1129else 1130KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1131endif 1132 1133export KBUILD_VMLINUX_LIBS 1134export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1135 1136ifdef CONFIG_TRIM_UNUSED_KSYMS 1137# For the kernel to actually contain only the needed exported symbols, 1138# we have to build modules as well to determine what those symbols are. 1139KBUILD_MODULES := 1 1140endif 1141 1142# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1143quiet_cmd_ar_vmlinux.a = AR $@ 1144 cmd_ar_vmlinux.a = \ 1145 rm -f $@; \ 1146 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1147 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1148 1149targets += vmlinux.a 1150vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1151 $(call if_changed,ar_vmlinux.a) 1152 1153PHONY += vmlinux_o 1154vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1155 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1156 1157vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1158 @: 1159 1160PHONY += vmlinux 1161# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1162# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1163# unrelated; the decompressors just happen to have the same base name, 1164# arch/*/boot/compressed/vmlinux. 1165# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1166# 1167# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1168# https://savannah.gnu.org/bugs/?61463 1169# For Make > 4.4, the following simple code will work: 1170# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1171vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1172vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1173vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1174 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1175 1176# The actual objects are generated when descending, 1177# make sure no implicit rule kicks in 1178$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1179 1180ifeq ($(origin KERNELRELEASE),file) 1181filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1182else 1183filechk_kernel.release = echo $(KERNELRELEASE) 1184endif 1185 1186# Store (new) KERNELRELEASE string in include/config/kernel.release 1187include/config/kernel.release: FORCE 1188 $(call filechk,kernel.release) 1189 1190# Additional helpers built in scripts/ 1191# Carefully list dependencies so we do not try to build scripts twice 1192# in parallel 1193PHONY += scripts 1194scripts: scripts_basic scripts_dtc 1195 $(Q)$(MAKE) $(build)=$(@) 1196 1197# Things we need to do before we recursively start building the kernel 1198# or the modules are listed in "prepare". 1199# A multi level approach is used. prepareN is processed before prepareN-1. 1200# archprepare is used in arch Makefiles and when processed asm symlink, 1201# version.h and scripts_basic is processed / created. 1202 1203PHONY += prepare archprepare 1204 1205archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1206 asm-generic $(version_h) include/generated/utsrelease.h \ 1207 include/generated/compile.h include/generated/autoconf.h remove-stale-files 1208 1209prepare0: archprepare 1210 $(Q)$(MAKE) $(build)=scripts/mod 1211 $(Q)$(MAKE) $(build)=. prepare 1212 1213# All the preparing.. 1214prepare: prepare0 1215ifdef CONFIG_RUST 1216 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1217 $(Q)$(MAKE) $(build)=rust 1218endif 1219 1220PHONY += remove-stale-files 1221remove-stale-files: 1222 $(Q)$(srctree)/scripts/remove-stale-files 1223 1224# Support for using generic headers in asm-generic 1225asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj 1226 1227PHONY += asm-generic uapi-asm-generic 1228asm-generic: uapi-asm-generic 1229 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1230 generic=include/asm-generic 1231uapi-asm-generic: 1232 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1233 generic=include/uapi/asm-generic 1234 1235# Generate some files 1236# --------------------------------------------------------------------------- 1237 1238# KERNELRELEASE can change from a few different places, meaning version.h 1239# needs to be updated, so this check is forced on all builds 1240 1241uts_len := 64 1242define filechk_utsrelease.h 1243 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1244 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1245 exit 1; \ 1246 fi; \ 1247 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1248endef 1249 1250define filechk_version.h 1251 if [ $(SUBLEVEL) -gt 255 ]; then \ 1252 echo \#define LINUX_VERSION_CODE $(shell \ 1253 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1254 else \ 1255 echo \#define LINUX_VERSION_CODE $(shell \ 1256 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1257 fi; \ 1258 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1259 ((c) > 255 ? 255 : (c)))'; \ 1260 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1261 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1262 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1263endef 1264 1265$(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1266$(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0) 1267$(version_h): FORCE 1268 $(call filechk,version.h) 1269 1270include/generated/utsrelease.h: include/config/kernel.release FORCE 1271 $(call filechk,utsrelease.h) 1272 1273filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1274 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1275 1276include/generated/compile.h: FORCE 1277 $(call filechk,compile.h) 1278 1279PHONY += headerdep 1280headerdep: 1281 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1282 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1283 1284# --------------------------------------------------------------------------- 1285# Kernel headers 1286 1287#Default location for installed headers 1288export INSTALL_HDR_PATH = $(objtree)/usr 1289 1290quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1291 cmd_headers_install = \ 1292 mkdir -p $(INSTALL_HDR_PATH); \ 1293 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1294 usr/include $(INSTALL_HDR_PATH) 1295 1296PHONY += headers_install 1297headers_install: headers 1298 $(call cmd,headers_install) 1299 1300PHONY += archheaders archscripts 1301 1302hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1303 1304PHONY += headers 1305headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1306 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML)) 1307 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1308 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1309 1310ifdef CONFIG_HEADERS_INSTALL 1311prepare: headers 1312endif 1313 1314PHONY += scripts_unifdef 1315scripts_unifdef: scripts_basic 1316 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1317 1318# --------------------------------------------------------------------------- 1319# Install 1320 1321# Many distributions have the custom install script, /sbin/installkernel. 1322# If DKMS is installed, 'make install' will eventually recurse back 1323# to this Makefile to build and install external modules. 1324# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1325 1326quiet_cmd_install = INSTALL $(INSTALL_PATH) 1327 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1328 1329# --------------------------------------------------------------------------- 1330# vDSO install 1331 1332PHONY += vdso_install 1333vdso_install: export INSTALL_FILES = $(vdso-install-y) 1334vdso_install: 1335 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1336 1337# --------------------------------------------------------------------------- 1338# Tools 1339 1340ifdef CONFIG_OBJTOOL 1341prepare: tools/objtool 1342endif 1343 1344ifdef CONFIG_BPF 1345ifdef CONFIG_DEBUG_INFO_BTF 1346prepare: tools/bpf/resolve_btfids 1347endif 1348endif 1349 1350# The tools build system is not a part of Kbuild and tends to introduce 1351# its own unique issues. If you need to integrate a new tool into Kbuild, 1352# please consider locating that tool outside the tools/ tree and using the 1353# standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry 1354# here. See Documentation/kbuild/makefiles.rst for details. 1355 1356PHONY += resolve_btfids_clean 1357 1358resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1359 1360# tools/bpf/resolve_btfids directory might not exist 1361# in output directory, skip its clean in that case 1362resolve_btfids_clean: 1363ifneq ($(wildcard $(resolve_btfids_O)),) 1364 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1365endif 1366 1367# Clear a bunch of variables before executing the submake 1368ifeq ($(quiet),silent_) 1369tools_silent=s 1370endif 1371 1372tools/: FORCE 1373 $(Q)mkdir -p $(objtree)/tools 1374 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1375 1376tools/%: FORCE 1377 $(Q)mkdir -p $(objtree)/tools 1378 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1379 1380# --------------------------------------------------------------------------- 1381# Kernel selftest 1382 1383PHONY += kselftest 1384kselftest: headers 1385 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1386 1387kselftest-%: headers FORCE 1388 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1389 1390PHONY += kselftest-merge 1391kselftest-merge: 1392 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1393 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1394 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1395 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1396 1397# --------------------------------------------------------------------------- 1398# Devicetree files 1399 1400ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1401dtstree := arch/$(SRCARCH)/boot/dts 1402endif 1403 1404ifneq ($(dtstree),) 1405 1406%.dtb: dtbs_prepare 1407 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1408 1409%.dtbo: dtbs_prepare 1410 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1411 1412PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1413dtbs: dtbs_prepare 1414 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1 1415 1416# include/config/kernel.release is actually needed when installing DTBs because 1417# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1418# dtbs_install depend on it as dtbs_install may run as root. 1419dtbs_prepare: include/config/kernel.release scripts_dtc 1420 1421ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1422export CHECK_DTBS=y 1423endif 1424 1425ifneq ($(CHECK_DTBS),) 1426dtbs_prepare: dt_binding_schemas 1427endif 1428 1429dtbs_check: dtbs 1430 1431dtbs_install: 1432 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) 1433 1434ifdef CONFIG_OF_EARLY_FLATTREE 1435all: dtbs 1436endif 1437 1438endif 1439 1440PHONY += scripts_dtc 1441scripts_dtc: scripts_basic 1442 $(Q)$(MAKE) $(build)=scripts/dtc 1443 1444ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1445export CHECK_DTBS=y 1446endif 1447 1448PHONY += dt_binding_check dt_binding_schemas 1449dt_binding_check: dt_binding_schemas scripts_dtc 1450 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1451 1452dt_binding_schemas: 1453 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1454 1455PHONY += dt_compatible_check 1456dt_compatible_check: dt_binding_schemas 1457 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1458 1459# --------------------------------------------------------------------------- 1460# Modules 1461 1462ifdef CONFIG_MODULES 1463 1464# By default, build modules as well 1465 1466all: modules 1467 1468# When we're building modules with modversions, we need to consider 1469# the built-in objects during the descend as well, in order to 1470# make sure the checksums are up to date before we record them. 1471ifdef CONFIG_MODVERSIONS 1472 KBUILD_BUILTIN := 1 1473endif 1474 1475# Build modules 1476# 1477 1478# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1479# is an exception. 1480ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1481KBUILD_BUILTIN := 1 1482modules: vmlinux 1483endif 1484 1485modules: modules_prepare 1486 1487# Target to prepare building external modules 1488modules_prepare: prepare 1489 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1490 1491endif # CONFIG_MODULES 1492 1493### 1494# Cleaning is done on three levels. 1495# make clean Delete most generated files 1496# Leave enough to build external modules 1497# make mrproper Delete the current configuration, and all generated files 1498# make distclean Remove editor backup files, patch leftover files and the like 1499 1500# Directories & files removed with 'make clean' 1501CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1502 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1503 modules.builtin.ranges vmlinux.o.map \ 1504 compile_commands.json rust/test \ 1505 rust-project.json .vmlinux.objs .vmlinux.export.c 1506 1507# Directories & files removed with 'make mrproper' 1508MRPROPER_FILES += include/config include/generated \ 1509 arch/$(SRCARCH)/include/generated .objdiff \ 1510 debian snap tar-install PKGBUILD pacman \ 1511 .config .config.old .version \ 1512 Module.symvers \ 1513 certs/signing_key.pem \ 1514 certs/x509.genkey \ 1515 vmlinux-gdb.py \ 1516 rpmbuild \ 1517 rust/libmacros.so 1518 1519# clean - Delete most, but leave enough to build external modules 1520# 1521clean: private rm-files := $(CLEAN_FILES) 1522 1523PHONY += archclean vmlinuxclean 1524 1525vmlinuxclean: 1526 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1527 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1528 1529clean: archclean vmlinuxclean resolve_btfids_clean 1530 1531# mrproper - Delete all generated files, including .config 1532# 1533mrproper: private rm-files := $(MRPROPER_FILES) 1534mrproper-dirs := $(addprefix _mrproper_,scripts) 1535 1536PHONY += $(mrproper-dirs) mrproper 1537$(mrproper-dirs): 1538 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1539 1540mrproper: clean $(mrproper-dirs) 1541 $(call cmd,rmfiles) 1542 @find . $(RCS_FIND_IGNORE) \ 1543 \( -name '*.rmeta' \) \ 1544 -type f -print | xargs rm -f 1545 1546# distclean 1547# 1548PHONY += distclean 1549 1550distclean: mrproper 1551 @find . $(RCS_FIND_IGNORE) \ 1552 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1553 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1554 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1555 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1556 -type f -print | xargs rm -f 1557 1558 1559# Packaging of the kernel to various formats 1560# --------------------------------------------------------------------------- 1561 1562%src-pkg: FORCE 1563 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1564%pkg: include/config/kernel.release FORCE 1565 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1566 1567# Brief documentation of the typical targets used 1568# --------------------------------------------------------------------------- 1569 1570boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1571boards := $(sort $(notdir $(boards))) 1572board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1573board-dirs := $(sort $(notdir $(board-dirs:/=))) 1574 1575PHONY += help 1576help: 1577 @echo 'Cleaning targets:' 1578 @echo ' clean - Remove most generated files but keep the config and' 1579 @echo ' enough build support to build external modules' 1580 @echo ' mrproper - Remove all generated files + config + various backup files' 1581 @echo ' distclean - mrproper + remove editor backup and patch files' 1582 @echo '' 1583 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1584 @echo '' 1585 @echo 'Other generic targets:' 1586 @echo ' all - Build all targets marked with [*]' 1587 @echo '* vmlinux - Build the bare kernel' 1588 @echo '* modules - Build all modules' 1589 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1590 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1591 @echo ' dir/ - Build all files in dir and below' 1592 @echo ' dir/file.[ois] - Build specified target only' 1593 @echo ' dir/file.ll - Build the LLVM assembly file' 1594 @echo ' (requires compiler support for LLVM assembly generation)' 1595 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1596 @echo ' (requires a recent binutils and recent build (System.map))' 1597 @echo ' dir/file.ko - Build module including final link' 1598 @echo ' modules_prepare - Set up for building external modules' 1599 @echo ' tags/TAGS - Generate tags file for editors' 1600 @echo ' cscope - Generate cscope index' 1601 @echo ' gtags - Generate GNU GLOBAL index' 1602 @echo ' kernelrelease - Output the release version string (use with make -s)' 1603 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1604 @echo ' image_name - Output the image name (use with make -s)' 1605 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1606 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1607 echo '' 1608 @echo 'Static analysers:' 1609 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1610 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1611 @echo ' versioncheck - Sanity check on version.h usage' 1612 @echo ' includecheck - Check for duplicate included header files' 1613 @echo ' export_report - List the usages of all exported symbols' 1614 @echo ' headerdep - Detect inclusion cycles in headers' 1615 @echo ' coccicheck - Check with Coccinelle' 1616 @echo ' clang-analyzer - Check with clang static analyzer' 1617 @echo ' clang-tidy - Check with clang-tidy' 1618 @echo '' 1619 @echo 'Tools:' 1620 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1621 @echo '' 1622 @echo 'Kernel selftest:' 1623 @echo ' kselftest - Build and run kernel selftest' 1624 @echo ' Build, install, and boot kernel before' 1625 @echo ' running kselftest on it' 1626 @echo ' Run as root for full coverage' 1627 @echo ' kselftest-all - Build kernel selftest' 1628 @echo ' kselftest-install - Build and install kernel selftest' 1629 @echo ' kselftest-clean - Remove all generated kselftest files' 1630 @echo ' kselftest-merge - Merge all the config dependencies of' 1631 @echo ' kselftest to existing .config.' 1632 @echo '' 1633 @echo 'Rust targets:' 1634 @echo ' rustavailable - Checks whether the Rust toolchain is' 1635 @echo ' available and, if not, explains why.' 1636 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1637 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1638 @echo ' is formatted, printing a diff otherwise.' 1639 @echo ' rustdoc - Generate Rust documentation' 1640 @echo ' (requires kernel .config)' 1641 @echo ' rusttest - Runs the Rust tests' 1642 @echo ' (requires kernel .config; downloads external repos)' 1643 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1644 @echo ' (requires kernel .config)' 1645 @echo ' dir/file.[os] - Build specified target only' 1646 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1647 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1648 @echo ' The output is not intended to be compilable.' 1649 @echo ' dir/file.ll - Build the LLVM assembly file' 1650 @echo '' 1651 @$(if $(dtstree), \ 1652 echo 'Devicetree:'; \ 1653 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1654 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1655 echo ' dt_binding_check - Validate device tree binding documents and examples'; \ 1656 echo ' dt_binding_schemas - Build processed device tree binding schemas'; \ 1657 echo ' dtbs_check - Validate device tree source files';\ 1658 echo '') 1659 1660 @echo 'Userspace tools targets:' 1661 @echo ' use "make tools/help"' 1662 @echo ' or "cd tools; make help"' 1663 @echo '' 1664 @echo 'Kernel packaging:' 1665 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1666 @echo '' 1667 @echo 'Documentation targets:' 1668 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1669 @echo '' 1670 @echo 'Architecture-specific targets ($(SRCARCH)):' 1671 @$(or $(archhelp),\ 1672 echo ' No architecture-specific help defined for $(SRCARCH)') 1673 @echo '' 1674 @$(if $(boards), \ 1675 $(foreach b, $(boards), \ 1676 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1677 echo '') 1678 @$(if $(board-dirs), \ 1679 $(foreach b, $(board-dirs), \ 1680 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1681 printf " %-16s - Show all of the above\\n" help-boards; \ 1682 echo '') 1683 1684 @echo ' make V=n [targets] 1: verbose build' 1685 @echo ' 2: give reason for rebuild of target' 1686 @echo ' V=1 and V=2 can be combined with V=12' 1687 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1688 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1689 @echo ' (sparse by default)' 1690 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1691 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1692 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where' 1693 @echo ' 1: warnings which may be relevant and do not occur too often' 1694 @echo ' 2: warnings which occur quite often but may still be relevant' 1695 @echo ' 3: more obscure warnings, can most likely be ignored' 1696 @echo ' c: extra checks in the configuration stage (Kconfig)' 1697 @echo ' e: warnings are being treated as errors' 1698 @echo ' Multiple levels can be combined with W=12 or W=123' 1699 @$(if $(dtstree), \ 1700 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1701 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1702 ) 1703 @echo '' 1704 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1705 @echo 'For further info see the ./README file' 1706 1707 1708help-board-dirs := $(addprefix help-,$(board-dirs)) 1709 1710help-boards: $(help-board-dirs) 1711 1712boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1713 1714$(help-board-dirs): help-%: 1715 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1716 @$(if $(boards-per-dir), \ 1717 $(foreach b, $(boards-per-dir), \ 1718 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1719 echo '') 1720 1721 1722# Documentation targets 1723# --------------------------------------------------------------------------- 1724DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1725 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs 1726PHONY += $(DOC_TARGETS) 1727$(DOC_TARGETS): 1728 $(Q)$(MAKE) $(build)=Documentation $@ 1729 1730 1731# Rust targets 1732# --------------------------------------------------------------------------- 1733 1734# "Is Rust available?" target 1735PHONY += rustavailable 1736rustavailable: 1737 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1738 1739# Documentation target 1740# 1741# Using the singular to avoid running afoul of `no-dot-config-targets`. 1742PHONY += rustdoc 1743rustdoc: prepare 1744 $(Q)$(MAKE) $(build)=rust $@ 1745 1746# Testing target 1747PHONY += rusttest 1748rusttest: prepare 1749 $(Q)$(MAKE) $(build)=rust $@ 1750 1751# Formatting targets 1752PHONY += rustfmt rustfmtcheck 1753 1754# We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream. 1755# 1756# We match using absolute paths since `find` does not resolve them 1757# when matching, which is a problem when e.g. `srctree` is `..`. 1758# We `grep` afterwards in order to remove the directory entry itself. 1759rustfmt: 1760 $(Q)find $(abs_srctree) -type f -name '*.rs' \ 1761 -o -path $(abs_srctree)/rust/alloc -prune \ 1762 -o -path $(abs_objtree)/rust/test -prune \ 1763 | grep -Fv $(abs_srctree)/rust/alloc \ 1764 | grep -Fv $(abs_objtree)/rust/test \ 1765 | grep -Fv generated \ 1766 | xargs $(RUSTFMT) $(rustfmt_flags) 1767 1768rustfmtcheck: rustfmt_flags = --check 1769rustfmtcheck: rustfmt 1770 1771# Misc 1772# --------------------------------------------------------------------------- 1773 1774PHONY += misc-check 1775misc-check: 1776 $(Q)$(srctree)/scripts/misc-check 1777 1778all: misc-check 1779 1780PHONY += scripts_gdb 1781scripts_gdb: prepare0 1782 $(Q)$(MAKE) $(build)=scripts/gdb 1783 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1784 1785ifdef CONFIG_GDB_SCRIPTS 1786all: scripts_gdb 1787endif 1788 1789else # KBUILD_EXTMOD 1790 1791filechk_kernel.release = echo $(KERNELRELEASE) 1792 1793### 1794# External module support. 1795# When building external modules the kernel used as basis is considered 1796# read-only, and no consistency checks are made and the make 1797# system is not used on the basis kernel. If updates are required 1798# in the basis kernel ordinary make commands (without M=...) must be used. 1799 1800# We are always building only modules. 1801KBUILD_BUILTIN := 1802KBUILD_MODULES := 1 1803 1804build-dir := $(KBUILD_EXTMOD) 1805 1806compile_commands.json: $(extmod_prefix)compile_commands.json 1807PHONY += compile_commands.json 1808 1809clean-dirs := $(KBUILD_EXTMOD) 1810clean: private rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1811 $(KBUILD_EXTMOD)/compile_commands.json 1812 1813PHONY += prepare 1814# now expand this into a simple variable to reduce the cost of shell evaluations 1815prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1816prepare: 1817 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1818 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1819 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1820 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1821 fi 1822 1823PHONY += help 1824help: 1825 @echo ' Building external modules.' 1826 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1827 @echo '' 1828 @echo ' modules - default target, build the module(s)' 1829 @echo ' modules_install - install the module' 1830 @echo ' clean - remove generated files in module directory only' 1831 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 1832 @echo '' 1833 1834ifndef CONFIG_MODULES 1835modules modules_install: __external_modules_error 1836__external_modules_error: 1837 @echo >&2 '***' 1838 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 1839 @echo >&2 '*** You cannot build or install external modules.' 1840 @echo >&2 '***' 1841 @false 1842endif 1843 1844endif # KBUILD_EXTMOD 1845 1846# --------------------------------------------------------------------------- 1847# Modules 1848 1849PHONY += modules modules_install modules_sign modules_prepare 1850 1851modules_install: 1852 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 1853 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 1854 1855ifeq ($(CONFIG_MODULE_SIG),y) 1856# modules_sign is a subset of modules_install. 1857# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1858modules_sign: modules_install 1859 @: 1860else 1861modules_sign: 1862 @echo >&2 '***' 1863 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 1864 @echo >&2 '***' 1865 @false 1866endif 1867 1868ifdef CONFIG_MODULES 1869 1870$(MODORDER): $(build-dir) 1871 @: 1872 1873# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1874# This is solely useful to speed up test compiles. 1875modules: modpost 1876ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1877 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1878endif 1879 1880PHONY += modules_check 1881modules_check: $(MODORDER) 1882 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1883 1884else # CONFIG_MODULES 1885 1886modules: 1887 @: 1888 1889KBUILD_MODULES := 1890 1891endif # CONFIG_MODULES 1892 1893PHONY += modpost 1894modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 1895 $(if $(KBUILD_MODULES), modules_check) 1896 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1897 1898# Single targets 1899# --------------------------------------------------------------------------- 1900# To build individual files in subdirectories, you can do like this: 1901# 1902# make foo/bar/baz.s 1903# 1904# The supported suffixes for single-target are listed in 'single-targets' 1905# 1906# To build only under specific subdirectories, you can do like this: 1907# 1908# make foo/bar/baz/ 1909 1910ifdef single-build 1911 1912# .ko is special because modpost is needed 1913single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1914single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 1915 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 1916 1917$(single-ko): single_modules 1918 @: 1919$(single-no-ko): $(build-dir) 1920 @: 1921 1922# Remove MODORDER when done because it is not the real one. 1923PHONY += single_modules 1924single_modules: $(single-no-ko) modules_prepare 1925 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER) 1926 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1927ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1928 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1929endif 1930 $(Q)rm -f $(MODORDER) 1931 1932single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 1933 1934KBUILD_MODULES := 1 1935 1936endif 1937 1938# Preset locale variables to speed up the build process. Limit locale 1939# tweaks to this spot to avoid wrong language settings when running 1940# make menuconfig etc. 1941# Error messages still appears in the original language 1942PHONY += $(build-dir) 1943$(build-dir): prepare 1944 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 1945 1946clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1947PHONY += $(clean-dirs) clean 1948$(clean-dirs): 1949 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1950 1951clean: $(clean-dirs) 1952 $(call cmd,rmfiles) 1953 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1954 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 1955 -o -name '*.ko.*' \ 1956 -o -name '*.dtb' -o -name '*.dtbo' \ 1957 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 1958 -o -name '*.dt.yaml' -o -name 'dtbs-list' \ 1959 -o -name '*.dwo' -o -name '*.lst' \ 1960 -o -name '*.su' -o -name '*.mod' \ 1961 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1962 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1963 -o -name '*.asn1.[ch]' \ 1964 -o -name '*.symtypes' -o -name 'modules.order' \ 1965 -o -name '*.c.[012]*.*' \ 1966 -o -name '*.ll' \ 1967 -o -name '*.gcno' \ 1968 \) -type f -print \ 1969 -o -name '.tmp_*' -print \ 1970 | xargs rm -rf 1971 1972# Generate tags for editors 1973# --------------------------------------------------------------------------- 1974quiet_cmd_tags = GEN $@ 1975 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1976 1977tags TAGS cscope gtags: FORCE 1978 $(call cmd,tags) 1979 1980# Generate rust-project.json (a file that describes the structure of non-Cargo 1981# Rust projects) for rust-analyzer (an implementation of the Language Server 1982# Protocol). 1983PHONY += rust-analyzer 1984rust-analyzer: 1985 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1986 $(Q)$(MAKE) $(build)=rust $@ 1987 1988# Script to generate missing namespace dependencies 1989# --------------------------------------------------------------------------- 1990 1991PHONY += nsdeps 1992nsdeps: export KBUILD_NSDEPS=1 1993nsdeps: modules 1994 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1995 1996# Clang Tooling 1997# --------------------------------------------------------------------------- 1998 1999quiet_cmd_gen_compile_commands = GEN $@ 2000 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 2001 2002$(extmod_prefix)compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \ 2003 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 2004 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 2005 $(call if_changed,gen_compile_commands) 2006 2007targets += $(extmod_prefix)compile_commands.json 2008 2009PHONY += clang-tidy clang-analyzer 2010 2011ifdef CONFIG_CC_IS_CLANG 2012quiet_cmd_clang_tools = CHECK $< 2013 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 2014 2015clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 2016 $(call cmd,clang_tools) 2017else 2018clang-tidy clang-analyzer: 2019 @echo "$@ requires CC=clang" >&2 2020 @false 2021endif 2022 2023# Scripts to check various things for consistency 2024# --------------------------------------------------------------------------- 2025 2026PHONY += includecheck versioncheck coccicheck export_report 2027 2028includecheck: 2029 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2030 -name '*.[hcS]' -type f -print | sort \ 2031 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2032 2033versioncheck: 2034 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2035 -name '*.[hcS]' -type f -print | sort \ 2036 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2037 2038coccicheck: 2039 $(Q)$(BASH) $(srctree)/scripts/$@ 2040 2041export_report: 2042 $(PERL) $(srctree)/scripts/export_report.pl 2043 2044PHONY += checkstack kernelrelease kernelversion image_name 2045 2046# UML needs a little special treatment here. It wants to use the host 2047# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2048# else wants $(ARCH), including people doing cross-builds, which means 2049# that $(SUBARCH) doesn't work here. 2050ifeq ($(ARCH), um) 2051CHECKSTACK_ARCH := $(SUBARCH) 2052else 2053CHECKSTACK_ARCH := $(ARCH) 2054endif 2055MINSTACKSIZE ?= 100 2056checkstack: 2057 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2058 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2059 2060kernelrelease: 2061 @$(filechk_kernel.release) 2062 2063kernelversion: 2064 @echo $(KERNELVERSION) 2065 2066image_name: 2067 @echo $(KBUILD_IMAGE) 2068 2069PHONY += run-command 2070run-command: 2071 $(Q)$(KBUILD_RUN_COMMAND) 2072 2073quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2074 cmd_rmfiles = rm -rf $(rm-files) 2075 2076# read saved command lines for existing targets 2077existing-targets := $(wildcard $(sort $(targets))) 2078 2079-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2080 2081endif # config-build 2082endif # mixed-build 2083endif # need-sub-make 2084 2085PHONY += FORCE 2086FORCE: 2087 2088# Declare the contents of the PHONY variable as phony. We keep that 2089# information in a variable so we can use it in if_changed and friends. 2090.PHONY: $(PHONY) 2091