1# SPDX-License-Identifier: GPL-2.0 2VERSION = 6 3PATCHLEVEL = 11 4SUBLEVEL = 0 5EXTRAVERSION = -rc4 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 -Dunsafe_op_in_unsafe_fn \ 449 -Dnon_ascii_idents \ 450 -Wrust_2018_idioms \ 451 -Wunreachable_pub \ 452 -Wmissing_docs \ 453 -Wrustdoc::missing_crate_level_docs \ 454 -Wclippy::all \ 455 -Wclippy::mut_mut \ 456 -Wclippy::needless_bitwise_bool \ 457 -Wclippy::needless_continue \ 458 -Wclippy::no_mangle_with_rust_abi \ 459 -Wclippy::dbg_macro 460 461KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \ 462 $(HOSTCFLAGS) -I $(srctree)/scripts/include 463KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \ 464 -I $(srctree)/scripts/include 465KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 466 -Zallow-features= $(HOSTRUSTFLAGS) 467KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 468KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 469 470# Make variables (CC, etc...) 471CPP = $(CC) -E 472ifneq ($(LLVM),) 473CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 474LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 475AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 476NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 477OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 478OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 479READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 480STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 481else 482CC = $(CROSS_COMPILE)gcc 483LD = $(CROSS_COMPILE)ld 484AR = $(CROSS_COMPILE)ar 485NM = $(CROSS_COMPILE)nm 486OBJCOPY = $(CROSS_COMPILE)objcopy 487OBJDUMP = $(CROSS_COMPILE)objdump 488READELF = $(CROSS_COMPILE)readelf 489STRIP = $(CROSS_COMPILE)strip 490endif 491RUSTC = rustc 492RUSTDOC = rustdoc 493RUSTFMT = rustfmt 494CLIPPY_DRIVER = clippy-driver 495BINDGEN = bindgen 496PAHOLE = pahole 497RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 498LEX = flex 499YACC = bison 500AWK = awk 501INSTALLKERNEL := installkernel 502PERL = perl 503PYTHON3 = python3 504CHECK = sparse 505BASH = bash 506KGZIP = gzip 507KBZIP2 = bzip2 508KLZOP = lzop 509LZMA = lzma 510LZ4 = lz4c 511XZ = xz 512ZSTD = zstd 513 514CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 515 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 516NOSTDINC_FLAGS := 517CFLAGS_MODULE = 518RUSTFLAGS_MODULE = 519AFLAGS_MODULE = 520LDFLAGS_MODULE = 521CFLAGS_KERNEL = 522RUSTFLAGS_KERNEL = 523AFLAGS_KERNEL = 524LDFLAGS_vmlinux = 525 526# Use USERINCLUDE when you must reference the UAPI directories only. 527USERINCLUDE := \ 528 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 529 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 530 -I$(srctree)/include/uapi \ 531 -I$(objtree)/include/generated/uapi \ 532 -include $(srctree)/include/linux/compiler-version.h \ 533 -include $(srctree)/include/linux/kconfig.h 534 535# Use LINUXINCLUDE when you must reference the include/ directory. 536# Needed to be compatible with the O= option 537LINUXINCLUDE := \ 538 -I$(srctree)/arch/$(SRCARCH)/include \ 539 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 540 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 541 -I$(objtree)/include \ 542 $(USERINCLUDE) 543 544KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 545 546KBUILD_CFLAGS := 547KBUILD_CFLAGS += -std=gnu11 548KBUILD_CFLAGS += -fshort-wchar 549KBUILD_CFLAGS += -funsigned-char 550KBUILD_CFLAGS += -fno-common 551KBUILD_CFLAGS += -fno-PIE 552KBUILD_CFLAGS += -fno-strict-aliasing 553 554KBUILD_CPPFLAGS := -D__KERNEL__ 555KBUILD_RUSTFLAGS := $(rust_common_flags) \ 556 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 557 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 558 -Csymbol-mangling-version=v0 \ 559 -Crelocation-model=static \ 560 -Zfunction-sections=n \ 561 -Wclippy::float_arithmetic 562 563KBUILD_AFLAGS_KERNEL := 564KBUILD_CFLAGS_KERNEL := 565KBUILD_RUSTFLAGS_KERNEL := 566KBUILD_AFLAGS_MODULE := -DMODULE 567KBUILD_CFLAGS_MODULE := -DMODULE 568KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 569KBUILD_LDFLAGS_MODULE := 570KBUILD_LDFLAGS := 571CLANG_FLAGS := 572 573ifeq ($(KBUILD_CLIPPY),1) 574 RUSTC_OR_CLIPPY_QUIET := CLIPPY 575 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 576else 577 RUSTC_OR_CLIPPY_QUIET := RUSTC 578 RUSTC_OR_CLIPPY = $(RUSTC) 579endif 580 581ifdef RUST_LIB_SRC 582 export RUST_LIB_SRC 583endif 584 585# Allows the usage of unstable features in stable compilers. 586export RUSTC_BOOTSTRAP := 1 587 588export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 589export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN 590export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 591export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 592export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 593export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 594export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 595export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 596 597export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 598export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 599export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 600export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 601export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 602export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 603 604# Files to ignore in find ... statements 605 606export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 607 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 608 -prune -o 609 610# =========================================================================== 611# Rules shared between *config targets and build targets 612 613# Basic helpers built in scripts/basic/ 614PHONY += scripts_basic 615scripts_basic: 616 $(Q)$(MAKE) $(build)=scripts/basic 617 618PHONY += outputmakefile 619ifdef building_out_of_srctree 620# Before starting out-of-tree build, make sure the source tree is clean. 621# outputmakefile generates a Makefile in the output directory, if using a 622# separate output directory. This allows convenient use of make in the 623# output directory. 624# At the same time when output Makefile generated, generate .gitignore to 625# ignore whole output directory 626 627quiet_cmd_makefile = GEN Makefile 628 cmd_makefile = { \ 629 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 630 echo "include $(srctree)/Makefile"; \ 631 } > Makefile 632 633outputmakefile: 634 @if [ -f $(srctree)/.config -o \ 635 -d $(srctree)/include/config -o \ 636 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 637 echo >&2 "***"; \ 638 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 639 echo >&2 "*** in $(abs_srctree)";\ 640 echo >&2 "***"; \ 641 false; \ 642 fi 643 $(Q)ln -fsn $(srctree) source 644 $(call cmd,makefile) 645 $(Q)test -e .gitignore || \ 646 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 647endif 648 649# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 650# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 651# CC_VERSION_TEXT and RUSTC_VERSION_TEXT are referenced from Kconfig (so they 652# need export), and from include/config/auto.conf.cmd to detect the compiler 653# upgrade. 654CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 655RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null)) 656 657ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 658include $(srctree)/scripts/Makefile.clang 659endif 660 661# Include this also for config targets because some architectures need 662# cc-cross-prefix to determine CROSS_COMPILE. 663ifdef need-compiler 664include $(srctree)/scripts/Makefile.compiler 665endif 666 667ifdef config-build 668# =========================================================================== 669# *config targets only - make sure prerequisites are updated, and descend 670# in scripts/kconfig to make the *config target 671 672# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 673# KBUILD_DEFCONFIG may point out an alternative default configuration 674# used for 'make defconfig' 675include $(srctree)/arch/$(SRCARCH)/Makefile 676export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT RUSTC_VERSION_TEXT 677 678config: outputmakefile scripts_basic FORCE 679 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 680 681%config: outputmakefile scripts_basic FORCE 682 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 683 684else #!config-build 685# =========================================================================== 686# Build targets only - this includes vmlinux, arch-specific targets, clean 687# targets and others. In general all targets except *config targets. 688 689# If building an external module we do not care about the all: rule 690# but instead __all depend on modules 691PHONY += all 692ifeq ($(KBUILD_EXTMOD),) 693__all: all 694else 695__all: modules 696endif 697 698targets := 699 700# Decide whether to build built-in, modular, or both. 701# Normally, just do built-in. 702 703KBUILD_MODULES := 704KBUILD_BUILTIN := 1 705 706# If we have only "make modules", don't compile built-in objects. 707ifeq ($(MAKECMDGOALS),modules) 708 KBUILD_BUILTIN := 709endif 710 711# If we have "make <whatever> modules", compile modules 712# in addition to whatever we do anyway. 713# Just "make" or "make all" shall build modules as well 714 715ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 716 KBUILD_MODULES := 1 717endif 718 719ifeq ($(MAKECMDGOALS),) 720 KBUILD_MODULES := 1 721endif 722 723export KBUILD_MODULES KBUILD_BUILTIN 724 725ifdef need-config 726include include/config/auto.conf 727endif 728 729ifeq ($(KBUILD_EXTMOD),) 730# Objects we will link into vmlinux / subdirs we need to visit 731core-y := 732drivers-y := 733libs-y := lib/ 734endif # KBUILD_EXTMOD 735 736# The all: target is the default when no target is given on the 737# command line. 738# This allow a user to issue only 'make' to build a kernel including modules 739# Defaults to vmlinux, but the arch makefile usually adds further targets 740all: vmlinux 741 742CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 743ifdef CONFIG_CC_IS_GCC 744CFLAGS_GCOV += -fno-tree-loop-im 745endif 746export CFLAGS_GCOV 747 748# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 749ifdef CONFIG_FUNCTION_TRACER 750 CC_FLAGS_FTRACE := -pg 751endif 752 753include $(srctree)/arch/$(SRCARCH)/Makefile 754 755ifdef need-config 756ifdef may-sync-config 757# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 758# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 759# because some architectures define CROSS_COMPILE there. 760include include/config/auto.conf.cmd 761 762$(KCONFIG_CONFIG): 763 @echo >&2 '***' 764 @echo >&2 '*** Configuration file "$@" not found!' 765 @echo >&2 '***' 766 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 767 @echo >&2 '*** "make menuconfig" or "make xconfig").' 768 @echo >&2 '***' 769 @/bin/false 770 771# The actual configuration files used during the build are stored in 772# include/generated/ and include/config/. Update them if .config is newer than 773# include/config/auto.conf (which mirrors .config). 774# 775# This exploits the 'multi-target pattern rule' trick. 776# The syncconfig should be executed only once to make all the targets. 777# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 778# 779# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 780# so you cannot notice that Kconfig is waiting for the user input. 781%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 782 $(Q)$(kecho) " SYNC $@" 783 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 784else # !may-sync-config 785# External modules and some install targets need include/generated/autoconf.h 786# and include/config/auto.conf but do not care if they are up-to-date. 787# Use auto.conf to trigger the test 788PHONY += include/config/auto.conf 789 790include/config/auto.conf: 791 @test -e include/generated/autoconf.h -a -e $@ || ( \ 792 echo >&2; \ 793 echo >&2 " ERROR: Kernel configuration is invalid."; \ 794 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 795 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 796 echo >&2 ; \ 797 /bin/false) 798 799endif # may-sync-config 800endif # need-config 801 802KBUILD_CFLAGS += -fno-delete-null-pointer-checks 803 804ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 805KBUILD_CFLAGS += -O2 806KBUILD_RUSTFLAGS += -Copt-level=2 807else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 808KBUILD_CFLAGS += -Os 809KBUILD_RUSTFLAGS += -Copt-level=s 810endif 811 812# Always set `debug-assertions` and `overflow-checks` because their default 813# depends on `opt-level` and `debug-assertions`, respectively. 814KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 815KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 816 817# Tell gcc to never replace conditional load with a non-conditional one 818ifdef CONFIG_CC_IS_GCC 819# gcc-10 renamed --param=allow-store-data-races=0 to 820# -fno-allow-store-data-races. 821KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 822KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 823endif 824 825ifdef CONFIG_READABLE_ASM 826# Disable optimizations that make assembler listings hard to read. 827# reorder blocks reorders the control in the function 828# ipa clone creates specialized cloned functions 829# partial inlining inlines only parts of functions 830KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 831endif 832 833stackp-flags-y := -fno-stack-protector 834stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 835stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 836 837KBUILD_CFLAGS += $(stackp-flags-y) 838 839KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings 840KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) 841 842ifdef CONFIG_FRAME_POINTER 843KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 844KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 845else 846# Some targets (ARM with Thumb2, for example), can't be built with frame 847# pointers. For those, we don't have FUNCTION_TRACER automatically 848# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 849# incompatible with -fomit-frame-pointer with current GCC, so we don't use 850# -fomit-frame-pointer with FUNCTION_TRACER. 851# In the Rust target specification, "frame-pointer" is set explicitly 852# to "may-omit". 853ifndef CONFIG_FUNCTION_TRACER 854KBUILD_CFLAGS += -fomit-frame-pointer 855endif 856endif 857 858# Initialize all stack variables with a 0xAA pattern. 859ifdef CONFIG_INIT_STACK_ALL_PATTERN 860KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 861endif 862 863# Initialize all stack variables with a zero value. 864ifdef CONFIG_INIT_STACK_ALL_ZERO 865KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 866ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 867# https://github.com/llvm/llvm-project/issues/44842 868CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 869export CC_AUTO_VAR_INIT_ZERO_ENABLER 870KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 871endif 872endif 873 874# While VLAs have been removed, GCC produces unreachable stack probes 875# for the randomize_kstack_offset feature. Disable it for all compilers. 876KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 877 878# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 879ifdef CONFIG_ZERO_CALL_USED_REGS 880KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 881endif 882 883ifdef CONFIG_FUNCTION_TRACER 884ifdef CONFIG_FTRACE_MCOUNT_USE_CC 885 CC_FLAGS_FTRACE += -mrecord-mcount 886 ifdef CONFIG_HAVE_NOP_MCOUNT 887 ifeq ($(call cc-option-yn, -mnop-mcount),y) 888 CC_FLAGS_FTRACE += -mnop-mcount 889 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 890 endif 891 endif 892endif 893ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 894 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 895 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 896 endif 897endif 898ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 899 ifdef CONFIG_HAVE_C_RECORDMCOUNT 900 BUILD_C_RECORDMCOUNT := y 901 export BUILD_C_RECORDMCOUNT 902 endif 903endif 904ifdef CONFIG_HAVE_FENTRY 905 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 906 ifeq ($(call cc-option-yn, -mfentry),y) 907 CC_FLAGS_FTRACE += -mfentry 908 CC_FLAGS_USING += -DCC_USING_FENTRY 909 endif 910endif 911export CC_FLAGS_FTRACE 912KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 913KBUILD_AFLAGS += $(CC_FLAGS_USING) 914endif 915 916# We trigger additional mismatches with less inlining 917ifdef CONFIG_DEBUG_SECTION_MISMATCH 918KBUILD_CFLAGS += -fno-inline-functions-called-once 919endif 920 921# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 922ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 923KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 924KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 925LDFLAGS_vmlinux += --gc-sections 926endif 927 928ifdef CONFIG_SHADOW_CALL_STACK 929ifndef CONFIG_DYNAMIC_SCS 930CC_FLAGS_SCS := -fsanitize=shadow-call-stack 931KBUILD_CFLAGS += $(CC_FLAGS_SCS) 932KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack 933endif 934export CC_FLAGS_SCS 935endif 936 937ifdef CONFIG_LTO_CLANG 938ifdef CONFIG_LTO_CLANG_THIN 939CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 940else 941CC_FLAGS_LTO := -flto 942endif 943CC_FLAGS_LTO += -fvisibility=hidden 944 945# Limit inlining across translation units to reduce binary size 946KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 947endif 948 949ifdef CONFIG_LTO 950KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 951KBUILD_AFLAGS += -fno-lto 952export CC_FLAGS_LTO 953endif 954 955ifdef CONFIG_CFI_CLANG 956CC_FLAGS_CFI := -fsanitize=kcfi 957KBUILD_CFLAGS += $(CC_FLAGS_CFI) 958export CC_FLAGS_CFI 959endif 960 961# Architectures can define flags to add/remove for floating-point support 962CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT 963export CC_FLAGS_FPU 964export CC_FLAGS_NO_FPU 965 966ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 967# Set the minimal function alignment. Use the newer GCC option 968# -fmin-function-alignment if it is available, or fall back to -falign-funtions. 969# See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. 970ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT 971KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) 972else 973KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 974endif 975endif 976 977# arch Makefile may override CC so keep this after arch Makefile is included 978NOSTDINC_FLAGS += -nostdinc 979 980# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 981# the kernel uses only C99 flexible arrays for dynamically sized trailing 982# arrays. Enforce this for everything that may examine structure sizes and 983# perform bounds checking. 984KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 985 986#Currently, disable -Wstringop-overflow for GCC 11, globally. 987KBUILD_CFLAGS-$(CONFIG_CC_NO_STRINGOP_OVERFLOW) += $(call cc-option, -Wno-stringop-overflow) 988KBUILD_CFLAGS-$(CONFIG_CC_STRINGOP_OVERFLOW) += $(call cc-option, -Wstringop-overflow) 989 990# disable invalid "can't wrap" optimizations for signed / pointers 991KBUILD_CFLAGS += -fno-strict-overflow 992 993# Make sure -fstack-check isn't enabled (like gentoo apparently did) 994KBUILD_CFLAGS += -fno-stack-check 995 996# conserve stack if available 997ifdef CONFIG_CC_IS_GCC 998KBUILD_CFLAGS += -fconserve-stack 999endif 1000 1001# change __FILE__ to the relative path from the srctree 1002KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1003 1004# include additional Makefiles when needed 1005include-y := scripts/Makefile.extrawarn 1006include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1007include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1008include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1009include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1010include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1011include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1012include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1013include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1014include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1015 1016include $(addprefix $(srctree)/, $(include-y)) 1017 1018# scripts/Makefile.gcc-plugins is intentionally included last. 1019# Do not add $(call cc-option,...) below this line. When you build the kernel 1020# from the clean source tree, the GCC plugins do not exist at this point. 1021 1022# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1023KBUILD_CPPFLAGS += $(KCPPFLAGS) 1024KBUILD_AFLAGS += $(KAFLAGS) 1025KBUILD_CFLAGS += $(KCFLAGS) 1026KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1027 1028KBUILD_LDFLAGS_MODULE += --build-id=sha1 1029LDFLAGS_vmlinux += --build-id=sha1 1030 1031KBUILD_LDFLAGS += -z noexecstack 1032ifeq ($(CONFIG_LD_IS_BFD),y) 1033KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1034endif 1035 1036ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1037LDFLAGS_vmlinux += -X 1038endif 1039 1040ifeq ($(CONFIG_RELR),y) 1041# ld.lld before 15 did not support -z pack-relative-relocs. 1042LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1043endif 1044 1045# We never want expected sections to be placed heuristically by the 1046# linker. All sections should be explicitly named in the linker script. 1047ifdef CONFIG_LD_ORPHAN_WARN 1048LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1049endif 1050 1051# Align the bit size of userspace programs with the kernel 1052KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1053KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1054 1055# make the checker run with the right architecture 1056CHECKFLAGS += --arch=$(ARCH) 1057 1058# insure the checker run with the right endianness 1059CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1060 1061# the checker needs the correct machine size 1062CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1063 1064# Default kernel image to build when no specific target is given. 1065# KBUILD_IMAGE may be overruled on the command line or 1066# set in the environment 1067# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1068# this default value 1069export KBUILD_IMAGE ?= vmlinux 1070 1071# 1072# INSTALL_PATH specifies where to place the updated kernel and system map 1073# images. Default is /boot, but you can set it to other values 1074export INSTALL_PATH ?= /boot 1075 1076# 1077# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1078# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1079# an argument if needed. Otherwise it defaults to the kernel install path 1080# 1081export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1082 1083# 1084# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1085# relocations required by build roots. This is not defined in the 1086# makefile but the argument can be passed to make if needed. 1087# 1088 1089MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1090export MODLIB 1091 1092PHONY += prepare0 1093 1094export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1095export MODORDER := $(extmod_prefix)modules.order 1096export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1097 1098ifeq ($(KBUILD_EXTMOD),) 1099 1100build-dir := . 1101clean-dirs := $(sort . Documentation \ 1102 $(patsubst %/,%,$(filter %/, $(core-) \ 1103 $(drivers-) $(libs-)))) 1104 1105export ARCH_CORE := $(core-y) 1106export ARCH_LIB := $(filter %/, $(libs-y)) 1107export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1108# Externally visible symbols (used by link-vmlinux.sh) 1109 1110KBUILD_VMLINUX_OBJS := ./built-in.a 1111ifdef CONFIG_MODULES 1112KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1113KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1114else 1115KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1116endif 1117 1118export KBUILD_VMLINUX_LIBS 1119export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1120 1121ifdef CONFIG_TRIM_UNUSED_KSYMS 1122# For the kernel to actually contain only the needed exported symbols, 1123# we have to build modules as well to determine what those symbols are. 1124KBUILD_MODULES := 1 1125endif 1126 1127# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1128quiet_cmd_ar_vmlinux.a = AR $@ 1129 cmd_ar_vmlinux.a = \ 1130 rm -f $@; \ 1131 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1132 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1133 1134targets += vmlinux.a 1135vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1136 $(call if_changed,ar_vmlinux.a) 1137 1138PHONY += vmlinux_o 1139vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1140 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1141 1142vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1143 @: 1144 1145PHONY += vmlinux 1146# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1147# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1148# unrelated; the decompressors just happen to have the same base name, 1149# arch/*/boot/compressed/vmlinux. 1150# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1151# 1152# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1153# https://savannah.gnu.org/bugs/?61463 1154# For Make > 4.4, the following simple code will work: 1155# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1156vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1157vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1158vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1159 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1160 1161# The actual objects are generated when descending, 1162# make sure no implicit rule kicks in 1163$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1164 1165ifeq ($(origin KERNELRELEASE),file) 1166filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1167else 1168filechk_kernel.release = echo $(KERNELRELEASE) 1169endif 1170 1171# Store (new) KERNELRELEASE string in include/config/kernel.release 1172include/config/kernel.release: FORCE 1173 $(call filechk,kernel.release) 1174 1175# Additional helpers built in scripts/ 1176# Carefully list dependencies so we do not try to build scripts twice 1177# in parallel 1178PHONY += scripts 1179scripts: scripts_basic scripts_dtc 1180 $(Q)$(MAKE) $(build)=$(@) 1181 1182# Things we need to do before we recursively start building the kernel 1183# or the modules are listed in "prepare". 1184# A multi level approach is used. prepareN is processed before prepareN-1. 1185# archprepare is used in arch Makefiles and when processed asm symlink, 1186# version.h and scripts_basic is processed / created. 1187 1188PHONY += prepare archprepare 1189 1190archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1191 asm-generic $(version_h) include/generated/utsrelease.h \ 1192 include/generated/compile.h include/generated/autoconf.h remove-stale-files 1193 1194prepare0: archprepare 1195 $(Q)$(MAKE) $(build)=scripts/mod 1196 $(Q)$(MAKE) $(build)=. prepare 1197 1198# All the preparing.. 1199prepare: prepare0 1200ifdef CONFIG_RUST 1201 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1202 $(Q)$(MAKE) $(build)=rust 1203endif 1204 1205PHONY += remove-stale-files 1206remove-stale-files: 1207 $(Q)$(srctree)/scripts/remove-stale-files 1208 1209# Support for using generic headers in asm-generic 1210asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj 1211 1212PHONY += asm-generic uapi-asm-generic 1213asm-generic: uapi-asm-generic 1214 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1215 generic=include/asm-generic 1216uapi-asm-generic: 1217 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1218 generic=include/uapi/asm-generic 1219 1220# Generate some files 1221# --------------------------------------------------------------------------- 1222 1223# KERNELRELEASE can change from a few different places, meaning version.h 1224# needs to be updated, so this check is forced on all builds 1225 1226uts_len := 64 1227define filechk_utsrelease.h 1228 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1229 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1230 exit 1; \ 1231 fi; \ 1232 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1233endef 1234 1235define filechk_version.h 1236 if [ $(SUBLEVEL) -gt 255 ]; then \ 1237 echo \#define LINUX_VERSION_CODE $(shell \ 1238 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1239 else \ 1240 echo \#define LINUX_VERSION_CODE $(shell \ 1241 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1242 fi; \ 1243 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1244 ((c) > 255 ? 255 : (c)))'; \ 1245 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1246 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1247 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1248endef 1249 1250$(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1251$(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0) 1252$(version_h): FORCE 1253 $(call filechk,version.h) 1254 1255include/generated/utsrelease.h: include/config/kernel.release FORCE 1256 $(call filechk,utsrelease.h) 1257 1258filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1259 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1260 1261include/generated/compile.h: FORCE 1262 $(call filechk,compile.h) 1263 1264PHONY += headerdep 1265headerdep: 1266 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1267 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1268 1269# --------------------------------------------------------------------------- 1270# Kernel headers 1271 1272#Default location for installed headers 1273export INSTALL_HDR_PATH = $(objtree)/usr 1274 1275quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1276 cmd_headers_install = \ 1277 mkdir -p $(INSTALL_HDR_PATH); \ 1278 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1279 usr/include $(INSTALL_HDR_PATH) 1280 1281PHONY += headers_install 1282headers_install: headers 1283 $(call cmd,headers_install) 1284 1285PHONY += archheaders archscripts 1286 1287hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1288 1289PHONY += headers 1290headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1291 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML)) 1292 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1293 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1294 1295ifdef CONFIG_HEADERS_INSTALL 1296prepare: headers 1297endif 1298 1299PHONY += scripts_unifdef 1300scripts_unifdef: scripts_basic 1301 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1302 1303# --------------------------------------------------------------------------- 1304# Install 1305 1306# Many distributions have the custom install script, /sbin/installkernel. 1307# If DKMS is installed, 'make install' will eventually recurse back 1308# to this Makefile to build and install external modules. 1309# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1310 1311quiet_cmd_install = INSTALL $(INSTALL_PATH) 1312 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1313 1314# --------------------------------------------------------------------------- 1315# vDSO install 1316 1317PHONY += vdso_install 1318vdso_install: export INSTALL_FILES = $(vdso-install-y) 1319vdso_install: 1320 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1321 1322# --------------------------------------------------------------------------- 1323# Tools 1324 1325ifdef CONFIG_OBJTOOL 1326prepare: tools/objtool 1327endif 1328 1329ifdef CONFIG_BPF 1330ifdef CONFIG_DEBUG_INFO_BTF 1331prepare: tools/bpf/resolve_btfids 1332endif 1333endif 1334 1335# The tools build system is not a part of Kbuild and tends to introduce 1336# its own unique issues. If you need to integrate a new tool into Kbuild, 1337# please consider locating that tool outside the tools/ tree and using the 1338# standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry 1339# here. See Documentation/kbuild/makefiles.rst for details. 1340 1341PHONY += resolve_btfids_clean 1342 1343resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1344 1345# tools/bpf/resolve_btfids directory might not exist 1346# in output directory, skip its clean in that case 1347resolve_btfids_clean: 1348ifneq ($(wildcard $(resolve_btfids_O)),) 1349 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1350endif 1351 1352# Clear a bunch of variables before executing the submake 1353ifeq ($(quiet),silent_) 1354tools_silent=s 1355endif 1356 1357tools/: FORCE 1358 $(Q)mkdir -p $(objtree)/tools 1359 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1360 1361tools/%: FORCE 1362 $(Q)mkdir -p $(objtree)/tools 1363 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1364 1365# --------------------------------------------------------------------------- 1366# Kernel selftest 1367 1368PHONY += kselftest 1369kselftest: headers 1370 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1371 1372kselftest-%: headers FORCE 1373 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1374 1375PHONY += kselftest-merge 1376kselftest-merge: 1377 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1378 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1379 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1380 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1381 1382# --------------------------------------------------------------------------- 1383# Devicetree files 1384 1385ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1386dtstree := arch/$(SRCARCH)/boot/dts 1387endif 1388 1389ifneq ($(dtstree),) 1390 1391%.dtb: dtbs_prepare 1392 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1393 1394%.dtbo: dtbs_prepare 1395 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1396 1397PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1398dtbs: dtbs_prepare 1399 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1 1400 1401# include/config/kernel.release is actually needed when installing DTBs because 1402# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1403# dtbs_install depend on it as dtbs_install may run as root. 1404dtbs_prepare: include/config/kernel.release scripts_dtc 1405 1406ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1407export CHECK_DTBS=y 1408endif 1409 1410ifneq ($(CHECK_DTBS),) 1411dtbs_prepare: dt_binding_schemas 1412endif 1413 1414dtbs_check: dtbs 1415 1416dtbs_install: 1417 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) 1418 1419ifdef CONFIG_OF_EARLY_FLATTREE 1420all: dtbs 1421endif 1422 1423endif 1424 1425PHONY += scripts_dtc 1426scripts_dtc: scripts_basic 1427 $(Q)$(MAKE) $(build)=scripts/dtc 1428 1429ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1430export CHECK_DTBS=y 1431endif 1432 1433PHONY += dt_binding_check dt_binding_schemas 1434dt_binding_check: dt_binding_schemas scripts_dtc 1435 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1436 1437dt_binding_schemas: 1438 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1439 1440PHONY += dt_compatible_check 1441dt_compatible_check: dt_binding_schemas 1442 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1443 1444# --------------------------------------------------------------------------- 1445# Modules 1446 1447ifdef CONFIG_MODULES 1448 1449# By default, build modules as well 1450 1451all: modules 1452 1453# When we're building modules with modversions, we need to consider 1454# the built-in objects during the descend as well, in order to 1455# make sure the checksums are up to date before we record them. 1456ifdef CONFIG_MODVERSIONS 1457 KBUILD_BUILTIN := 1 1458endif 1459 1460# Build modules 1461# 1462 1463# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1464# is an exception. 1465ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1466KBUILD_BUILTIN := 1 1467modules: vmlinux 1468endif 1469 1470modules: modules_prepare 1471 1472# Target to prepare building external modules 1473modules_prepare: prepare 1474 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1475 1476endif # CONFIG_MODULES 1477 1478### 1479# Cleaning is done on three levels. 1480# make clean Delete most generated files 1481# Leave enough to build external modules 1482# make mrproper Delete the current configuration, and all generated files 1483# make distclean Remove editor backup files, patch leftover files and the like 1484 1485# Directories & files removed with 'make clean' 1486CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1487 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1488 compile_commands.json rust/test \ 1489 rust-project.json .vmlinux.objs .vmlinux.export.c 1490 1491# Directories & files removed with 'make mrproper' 1492MRPROPER_FILES += include/config include/generated \ 1493 arch/$(SRCARCH)/include/generated .objdiff \ 1494 debian snap tar-install PKGBUILD pacman \ 1495 .config .config.old .version \ 1496 Module.symvers \ 1497 certs/signing_key.pem \ 1498 certs/x509.genkey \ 1499 vmlinux-gdb.py \ 1500 rpmbuild \ 1501 rust/libmacros.so 1502 1503# clean - Delete most, but leave enough to build external modules 1504# 1505clean: private rm-files := $(CLEAN_FILES) 1506 1507PHONY += archclean vmlinuxclean 1508 1509vmlinuxclean: 1510 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1511 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1512 1513clean: archclean vmlinuxclean resolve_btfids_clean 1514 1515# mrproper - Delete all generated files, including .config 1516# 1517mrproper: private rm-files := $(MRPROPER_FILES) 1518mrproper-dirs := $(addprefix _mrproper_,scripts) 1519 1520PHONY += $(mrproper-dirs) mrproper 1521$(mrproper-dirs): 1522 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1523 1524mrproper: clean $(mrproper-dirs) 1525 $(call cmd,rmfiles) 1526 @find . $(RCS_FIND_IGNORE) \ 1527 \( -name '*.rmeta' \) \ 1528 -type f -print | xargs rm -f 1529 1530# distclean 1531# 1532PHONY += distclean 1533 1534distclean: mrproper 1535 @find . $(RCS_FIND_IGNORE) \ 1536 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1537 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1538 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1539 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1540 -type f -print | xargs rm -f 1541 1542 1543# Packaging of the kernel to various formats 1544# --------------------------------------------------------------------------- 1545 1546%src-pkg: FORCE 1547 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1548%pkg: include/config/kernel.release FORCE 1549 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1550 1551# Brief documentation of the typical targets used 1552# --------------------------------------------------------------------------- 1553 1554boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1555boards := $(sort $(notdir $(boards))) 1556board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1557board-dirs := $(sort $(notdir $(board-dirs:/=))) 1558 1559PHONY += help 1560help: 1561 @echo 'Cleaning targets:' 1562 @echo ' clean - Remove most generated files but keep the config and' 1563 @echo ' enough build support to build external modules' 1564 @echo ' mrproper - Remove all generated files + config + various backup files' 1565 @echo ' distclean - mrproper + remove editor backup and patch files' 1566 @echo '' 1567 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1568 @echo '' 1569 @echo 'Other generic targets:' 1570 @echo ' all - Build all targets marked with [*]' 1571 @echo '* vmlinux - Build the bare kernel' 1572 @echo '* modules - Build all modules' 1573 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1574 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1575 @echo ' dir/ - Build all files in dir and below' 1576 @echo ' dir/file.[ois] - Build specified target only' 1577 @echo ' dir/file.ll - Build the LLVM assembly file' 1578 @echo ' (requires compiler support for LLVM assembly generation)' 1579 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1580 @echo ' (requires a recent binutils and recent build (System.map))' 1581 @echo ' dir/file.ko - Build module including final link' 1582 @echo ' modules_prepare - Set up for building external modules' 1583 @echo ' tags/TAGS - Generate tags file for editors' 1584 @echo ' cscope - Generate cscope index' 1585 @echo ' gtags - Generate GNU GLOBAL index' 1586 @echo ' kernelrelease - Output the release version string (use with make -s)' 1587 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1588 @echo ' image_name - Output the image name (use with make -s)' 1589 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1590 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1591 echo '' 1592 @echo 'Static analysers:' 1593 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1594 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1595 @echo ' versioncheck - Sanity check on version.h usage' 1596 @echo ' includecheck - Check for duplicate included header files' 1597 @echo ' export_report - List the usages of all exported symbols' 1598 @echo ' headerdep - Detect inclusion cycles in headers' 1599 @echo ' coccicheck - Check with Coccinelle' 1600 @echo ' clang-analyzer - Check with clang static analyzer' 1601 @echo ' clang-tidy - Check with clang-tidy' 1602 @echo '' 1603 @echo 'Tools:' 1604 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1605 @echo '' 1606 @echo 'Kernel selftest:' 1607 @echo ' kselftest - Build and run kernel selftest' 1608 @echo ' Build, install, and boot kernel before' 1609 @echo ' running kselftest on it' 1610 @echo ' Run as root for full coverage' 1611 @echo ' kselftest-all - Build kernel selftest' 1612 @echo ' kselftest-install - Build and install kernel selftest' 1613 @echo ' kselftest-clean - Remove all generated kselftest files' 1614 @echo ' kselftest-merge - Merge all the config dependencies of' 1615 @echo ' kselftest to existing .config.' 1616 @echo '' 1617 @echo 'Rust targets:' 1618 @echo ' rustavailable - Checks whether the Rust toolchain is' 1619 @echo ' available and, if not, explains why.' 1620 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1621 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1622 @echo ' is formatted, printing a diff otherwise.' 1623 @echo ' rustdoc - Generate Rust documentation' 1624 @echo ' (requires kernel .config)' 1625 @echo ' rusttest - Runs the Rust tests' 1626 @echo ' (requires kernel .config; downloads external repos)' 1627 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1628 @echo ' (requires kernel .config)' 1629 @echo ' dir/file.[os] - Build specified target only' 1630 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1631 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1632 @echo ' The output is not intended to be compilable.' 1633 @echo ' dir/file.ll - Build the LLVM assembly file' 1634 @echo '' 1635 @$(if $(dtstree), \ 1636 echo 'Devicetree:'; \ 1637 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1638 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1639 echo ' dt_binding_check - Validate device tree binding documents and examples'; \ 1640 echo ' dt_binding_schema - Build processed device tree binding schemas'; \ 1641 echo ' dtbs_check - Validate device tree source files';\ 1642 echo '') 1643 1644 @echo 'Userspace tools targets:' 1645 @echo ' use "make tools/help"' 1646 @echo ' or "cd tools; make help"' 1647 @echo '' 1648 @echo 'Kernel packaging:' 1649 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1650 @echo '' 1651 @echo 'Documentation targets:' 1652 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1653 @echo '' 1654 @echo 'Architecture-specific targets ($(SRCARCH)):' 1655 @$(or $(archhelp),\ 1656 echo ' No architecture-specific help defined for $(SRCARCH)') 1657 @echo '' 1658 @$(if $(boards), \ 1659 $(foreach b, $(boards), \ 1660 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1661 echo '') 1662 @$(if $(board-dirs), \ 1663 $(foreach b, $(board-dirs), \ 1664 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1665 printf " %-16s - Show all of the above\\n" help-boards; \ 1666 echo '') 1667 1668 @echo ' make V=n [targets] 1: verbose build' 1669 @echo ' 2: give reason for rebuild of target' 1670 @echo ' V=1 and V=2 can be combined with V=12' 1671 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1672 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1673 @echo ' (sparse by default)' 1674 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1675 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1676 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where' 1677 @echo ' 1: warnings which may be relevant and do not occur too often' 1678 @echo ' 2: warnings which occur quite often but may still be relevant' 1679 @echo ' 3: more obscure warnings, can most likely be ignored' 1680 @echo ' c: extra checks in the configuration stage (Kconfig)' 1681 @echo ' e: warnings are being treated as errors' 1682 @echo ' Multiple levels can be combined with W=12 or W=123' 1683 @$(if $(dtstree), \ 1684 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1685 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1686 ) 1687 @echo '' 1688 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1689 @echo 'For further info see the ./README file' 1690 1691 1692help-board-dirs := $(addprefix help-,$(board-dirs)) 1693 1694help-boards: $(help-board-dirs) 1695 1696boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1697 1698$(help-board-dirs): help-%: 1699 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1700 @$(if $(boards-per-dir), \ 1701 $(foreach b, $(boards-per-dir), \ 1702 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1703 echo '') 1704 1705 1706# Documentation targets 1707# --------------------------------------------------------------------------- 1708DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1709 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs 1710PHONY += $(DOC_TARGETS) 1711$(DOC_TARGETS): 1712 $(Q)$(MAKE) $(build)=Documentation $@ 1713 1714 1715# Rust targets 1716# --------------------------------------------------------------------------- 1717 1718# "Is Rust available?" target 1719PHONY += rustavailable 1720rustavailable: 1721 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1722 1723# Documentation target 1724# 1725# Using the singular to avoid running afoul of `no-dot-config-targets`. 1726PHONY += rustdoc 1727rustdoc: prepare 1728 $(Q)$(MAKE) $(build)=rust $@ 1729 1730# Testing target 1731PHONY += rusttest 1732rusttest: prepare 1733 $(Q)$(MAKE) $(build)=rust $@ 1734 1735# Formatting targets 1736PHONY += rustfmt rustfmtcheck 1737 1738# We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream. 1739# 1740# We match using absolute paths since `find` does not resolve them 1741# when matching, which is a problem when e.g. `srctree` is `..`. 1742# We `grep` afterwards in order to remove the directory entry itself. 1743rustfmt: 1744 $(Q)find $(abs_srctree) -type f -name '*.rs' \ 1745 -o -path $(abs_srctree)/rust/alloc -prune \ 1746 -o -path $(abs_objtree)/rust/test -prune \ 1747 | grep -Fv $(abs_srctree)/rust/alloc \ 1748 | grep -Fv $(abs_objtree)/rust/test \ 1749 | grep -Fv generated \ 1750 | xargs $(RUSTFMT) $(rustfmt_flags) 1751 1752rustfmtcheck: rustfmt_flags = --check 1753rustfmtcheck: rustfmt 1754 1755# Misc 1756# --------------------------------------------------------------------------- 1757 1758PHONY += misc-check 1759misc-check: 1760 $(Q)$(srctree)/scripts/misc-check 1761 1762all: misc-check 1763 1764PHONY += scripts_gdb 1765scripts_gdb: prepare0 1766 $(Q)$(MAKE) $(build)=scripts/gdb 1767 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1768 1769ifdef CONFIG_GDB_SCRIPTS 1770all: scripts_gdb 1771endif 1772 1773else # KBUILD_EXTMOD 1774 1775filechk_kernel.release = echo $(KERNELRELEASE) 1776 1777### 1778# External module support. 1779# When building external modules the kernel used as basis is considered 1780# read-only, and no consistency checks are made and the make 1781# system is not used on the basis kernel. If updates are required 1782# in the basis kernel ordinary make commands (without M=...) must be used. 1783 1784# We are always building only modules. 1785KBUILD_BUILTIN := 1786KBUILD_MODULES := 1 1787 1788build-dir := $(KBUILD_EXTMOD) 1789 1790compile_commands.json: $(extmod_prefix)compile_commands.json 1791PHONY += compile_commands.json 1792 1793clean-dirs := $(KBUILD_EXTMOD) 1794clean: private rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1795 $(KBUILD_EXTMOD)/compile_commands.json 1796 1797PHONY += prepare 1798# now expand this into a simple variable to reduce the cost of shell evaluations 1799prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1800prepare: 1801 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1802 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1803 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1804 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1805 fi 1806 1807PHONY += help 1808help: 1809 @echo ' Building external modules.' 1810 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1811 @echo '' 1812 @echo ' modules - default target, build the module(s)' 1813 @echo ' modules_install - install the module' 1814 @echo ' clean - remove generated files in module directory only' 1815 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 1816 @echo '' 1817 1818ifndef CONFIG_MODULES 1819modules modules_install: __external_modules_error 1820__external_modules_error: 1821 @echo >&2 '***' 1822 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 1823 @echo >&2 '*** You cannot build or install external modules.' 1824 @echo >&2 '***' 1825 @false 1826endif 1827 1828endif # KBUILD_EXTMOD 1829 1830# --------------------------------------------------------------------------- 1831# Modules 1832 1833PHONY += modules modules_install modules_sign modules_prepare 1834 1835modules_install: 1836 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 1837 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 1838 1839ifeq ($(CONFIG_MODULE_SIG),y) 1840# modules_sign is a subset of modules_install. 1841# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1842modules_sign: modules_install 1843 @: 1844else 1845modules_sign: 1846 @echo >&2 '***' 1847 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 1848 @echo >&2 '***' 1849 @false 1850endif 1851 1852ifdef CONFIG_MODULES 1853 1854$(MODORDER): $(build-dir) 1855 @: 1856 1857# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1858# This is solely useful to speed up test compiles. 1859modules: modpost 1860ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1861 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1862endif 1863 1864PHONY += modules_check 1865modules_check: $(MODORDER) 1866 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1867 1868else # CONFIG_MODULES 1869 1870modules: 1871 @: 1872 1873KBUILD_MODULES := 1874 1875endif # CONFIG_MODULES 1876 1877PHONY += modpost 1878modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 1879 $(if $(KBUILD_MODULES), modules_check) 1880 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1881 1882# Single targets 1883# --------------------------------------------------------------------------- 1884# To build individual files in subdirectories, you can do like this: 1885# 1886# make foo/bar/baz.s 1887# 1888# The supported suffixes for single-target are listed in 'single-targets' 1889# 1890# To build only under specific subdirectories, you can do like this: 1891# 1892# make foo/bar/baz/ 1893 1894ifdef single-build 1895 1896# .ko is special because modpost is needed 1897single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1898single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 1899 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 1900 1901$(single-ko): single_modules 1902 @: 1903$(single-no-ko): $(build-dir) 1904 @: 1905 1906# Remove MODORDER when done because it is not the real one. 1907PHONY += single_modules 1908single_modules: $(single-no-ko) modules_prepare 1909 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER) 1910 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1911ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1912 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1913endif 1914 $(Q)rm -f $(MODORDER) 1915 1916single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 1917 1918KBUILD_MODULES := 1 1919 1920endif 1921 1922# Preset locale variables to speed up the build process. Limit locale 1923# tweaks to this spot to avoid wrong language settings when running 1924# make menuconfig etc. 1925# Error messages still appears in the original language 1926PHONY += $(build-dir) 1927$(build-dir): prepare 1928 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 1929 1930clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1931PHONY += $(clean-dirs) clean 1932$(clean-dirs): 1933 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1934 1935clean: $(clean-dirs) 1936 $(call cmd,rmfiles) 1937 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1938 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 1939 -o -name '*.ko.*' \ 1940 -o -name '*.dtb' -o -name '*.dtbo' \ 1941 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 1942 -o -name '*.dt.yaml' -o -name 'dtbs-list' \ 1943 -o -name '*.dwo' -o -name '*.lst' \ 1944 -o -name '*.su' -o -name '*.mod' \ 1945 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1946 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1947 -o -name '*.asn1.[ch]' \ 1948 -o -name '*.symtypes' -o -name 'modules.order' \ 1949 -o -name '*.c.[012]*.*' \ 1950 -o -name '*.ll' \ 1951 -o -name '*.gcno' \ 1952 -o -name '*.*.symversions' \) -type f -print \ 1953 -o -name '.tmp_*' -print \ 1954 | xargs rm -rf 1955 1956# Generate tags for editors 1957# --------------------------------------------------------------------------- 1958quiet_cmd_tags = GEN $@ 1959 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1960 1961tags TAGS cscope gtags: FORCE 1962 $(call cmd,tags) 1963 1964# Generate rust-project.json (a file that describes the structure of non-Cargo 1965# Rust projects) for rust-analyzer (an implementation of the Language Server 1966# Protocol). 1967PHONY += rust-analyzer 1968rust-analyzer: 1969 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1970 $(Q)$(MAKE) $(build)=rust $@ 1971 1972# Script to generate missing namespace dependencies 1973# --------------------------------------------------------------------------- 1974 1975PHONY += nsdeps 1976nsdeps: export KBUILD_NSDEPS=1 1977nsdeps: modules 1978 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1979 1980# Clang Tooling 1981# --------------------------------------------------------------------------- 1982 1983quiet_cmd_gen_compile_commands = GEN $@ 1984 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1985 1986$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1987 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 1988 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1989 $(call if_changed,gen_compile_commands) 1990 1991targets += $(extmod_prefix)compile_commands.json 1992 1993PHONY += clang-tidy clang-analyzer 1994 1995ifdef CONFIG_CC_IS_CLANG 1996quiet_cmd_clang_tools = CHECK $< 1997 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1998 1999clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 2000 $(call cmd,clang_tools) 2001else 2002clang-tidy clang-analyzer: 2003 @echo "$@ requires CC=clang" >&2 2004 @false 2005endif 2006 2007# Scripts to check various things for consistency 2008# --------------------------------------------------------------------------- 2009 2010PHONY += includecheck versioncheck coccicheck export_report 2011 2012includecheck: 2013 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2014 -name '*.[hcS]' -type f -print | sort \ 2015 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2016 2017versioncheck: 2018 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2019 -name '*.[hcS]' -type f -print | sort \ 2020 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2021 2022coccicheck: 2023 $(Q)$(BASH) $(srctree)/scripts/$@ 2024 2025export_report: 2026 $(PERL) $(srctree)/scripts/export_report.pl 2027 2028PHONY += checkstack kernelrelease kernelversion image_name 2029 2030# UML needs a little special treatment here. It wants to use the host 2031# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2032# else wants $(ARCH), including people doing cross-builds, which means 2033# that $(SUBARCH) doesn't work here. 2034ifeq ($(ARCH), um) 2035CHECKSTACK_ARCH := $(SUBARCH) 2036else 2037CHECKSTACK_ARCH := $(ARCH) 2038endif 2039MINSTACKSIZE ?= 100 2040checkstack: 2041 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2042 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2043 2044kernelrelease: 2045 @$(filechk_kernel.release) 2046 2047kernelversion: 2048 @echo $(KERNELVERSION) 2049 2050image_name: 2051 @echo $(KBUILD_IMAGE) 2052 2053PHONY += run-command 2054run-command: 2055 $(Q)$(KBUILD_RUN_COMMAND) 2056 2057quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2058 cmd_rmfiles = rm -rf $(rm-files) 2059 2060# read saved command lines for existing targets 2061existing-targets := $(wildcard $(sort $(targets))) 2062 2063-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2064 2065endif # config-build 2066endif # mixed-build 2067endif # need-sub-make 2068 2069PHONY += FORCE 2070FORCE: 2071 2072# Declare the contents of the PHONY variable as phony. We keep that 2073# information in a variable so we can use it in if_changed and friends. 2074.PHONY: $(PHONY) 2075