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