1# SPDX-License-Identifier: GPL-2.0 2VERSION = 6 3PATCHLEVEL = 6 4SUBLEVEL = 94 5EXTRAVERSION = 6NAME = Pinguïn Aangedreven 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 ($(filter undefine,$(.FEATURES)),) 15$(error GNU Make >= 3.82 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)) 42export abs_srctree := $(realpath $(dir $(this-makefile))) 43export abs_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, $(KBUILD_VERBOSE)),) 90 quiet = 91 Q = 92endif 93 94# If the user is running make -s (silent mode), suppress echoing of 95# commands 96# make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS. 97 98ifeq ($(filter 3.%,$(MAKE_VERSION)),) 99short-opts := $(firstword -$(MAKEFLAGS)) 100else 101short-opts := $(filter-out --%,$(MAKEFLAGS)) 102endif 103 104ifneq ($(findstring s,$(short-opts)),) 105quiet=silent_ 106override KBUILD_VERBOSE := 107endif 108 109export quiet Q KBUILD_VERBOSE 110 111# Call a source code checker (by default, "sparse") as part of the 112# C compilation. 113# 114# Use 'make C=1' to enable checking of only re-compiled files. 115# Use 'make C=2' to enable checking of *all* source files, regardless 116# of whether they are re-compiled or not. 117# 118# See the file "Documentation/dev-tools/sparse.rst" for more details, 119# including where to get the "sparse" utility. 120 121ifeq ("$(origin C)", "command line") 122 KBUILD_CHECKSRC = $(C) 123endif 124ifndef KBUILD_CHECKSRC 125 KBUILD_CHECKSRC = 0 126endif 127 128export KBUILD_CHECKSRC 129 130# Enable "clippy" (a linter) as part of the Rust compilation. 131# 132# Use 'make CLIPPY=1' to enable it. 133ifeq ("$(origin CLIPPY)", "command line") 134 KBUILD_CLIPPY := $(CLIPPY) 135endif 136 137export KBUILD_CLIPPY 138 139# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 140# directory of external module to build. Setting M= takes precedence. 141ifeq ("$(origin M)", "command line") 142 KBUILD_EXTMOD := $(M) 143endif 144 145$(if $(word 2, $(KBUILD_EXTMOD)), \ 146 $(error building multiple external modules is not supported)) 147 148$(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \ 149 $(error module directory path cannot contain '$x'))) 150 151# Remove trailing slashes 152ifneq ($(filter %/, $(KBUILD_EXTMOD)),) 153KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) 154endif 155 156export KBUILD_EXTMOD 157 158# Kbuild will save output files in the current working directory. 159# This does not need to match to the root of the kernel source tree. 160# 161# For example, you can do this: 162# 163# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 164# 165# If you want to save output files in a different location, there are 166# two syntaxes to specify it. 167# 168# 1) O= 169# Use "make O=dir/to/store/output/files/" 170# 171# 2) Set KBUILD_OUTPUT 172# Set the environment variable KBUILD_OUTPUT to point to the output directory. 173# export KBUILD_OUTPUT=dir/to/store/output/files/; make 174# 175# The O= assignment takes precedence over the KBUILD_OUTPUT environment 176# variable. 177 178# Do we want to change the working directory? 179ifeq ("$(origin O)", "command line") 180 KBUILD_OUTPUT := $(O) 181endif 182 183ifneq ($(KBUILD_OUTPUT),) 184# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 185# expand a shell special character '~'. We use a somewhat tedious way here. 186abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 187$(if $(abs_objtree),, \ 188 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 189 190# $(realpath ...) resolves symlinks 191abs_objtree := $(realpath $(abs_objtree)) 192endif # ifneq ($(KBUILD_OUTPUT),) 193 194ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 195$(error source directory cannot contain spaces or colons) 196endif 197 198ifneq ($(filter 3.%,$(MAKE_VERSION)),) 199# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 200# We need to invoke sub-make to avoid implicit rules in the top Makefile. 201need-sub-make := 1 202# Cancel implicit rules for this Makefile. 203$(this-makefile): ; 204endif 205 206export sub_make_done := 1 207 208endif # sub_make_done 209 210ifeq ($(abs_objtree),$(CURDIR)) 211# Suppress "Entering directory ..." if we are at the final work directory. 212no-print-directory := --no-print-directory 213else 214# Recursion to show "Entering directory ..." 215need-sub-make := 1 216endif 217 218ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),) 219# If --no-print-directory is unset, recurse once again to set it. 220# You may end up recursing into __sub-make twice. This is needed due to the 221# behavior change in GNU Make 4.4.1. 222need-sub-make := 1 223endif 224 225ifeq ($(need-sub-make),1) 226 227PHONY += $(MAKECMDGOALS) __sub-make 228 229$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 230 @: 231 232# Invoke a second make in the output directory, passing relevant variables 233__sub-make: 234 $(Q)$(MAKE) $(no-print-directory) -C $(abs_objtree) \ 235 -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 236 237else # need-sub-make 238 239# We process the rest of the Makefile if this is the final invocation of make 240 241ifeq ($(abs_srctree),$(abs_objtree)) 242 # building in the source tree 243 srctree := . 244 building_out_of_srctree := 245else 246 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 247 # building in a subdirectory of the source tree 248 srctree := .. 249 else 250 srctree := $(abs_srctree) 251 endif 252 building_out_of_srctree := 1 253endif 254 255ifneq ($(KBUILD_ABS_SRCTREE),) 256srctree := $(abs_srctree) 257endif 258 259objtree := . 260VPATH := $(srctree) 261 262export building_out_of_srctree srctree objtree VPATH 263 264# To make sure we do not include .config for any of the *config targets 265# catch them early, and hand them over to scripts/kconfig/Makefile 266# It is allowed to specify more targets when calling make, including 267# mixing *config targets and build targets. 268# For example 'make oldconfig all'. 269# Detect when mixed targets is specified, and make a second invocation 270# of make so .config is not included in this case either (for *config). 271 272version_h := include/generated/uapi/linux/version.h 273 274clean-targets := %clean mrproper cleandocs 275no-dot-config-targets := $(clean-targets) \ 276 cscope gtags TAGS tags help% %docs check% coccicheck \ 277 $(version_h) headers headers_% archheaders archscripts \ 278 %asm-generic kernelversion %src-pkg dt_binding_check \ 279 outputmakefile rustavailable rustfmt rustfmtcheck 280# Installation targets should not require compiler. Unfortunately, vdso_install 281# is an exception where build artifacts may be updated. This must be fixed. 282no-compiler-targets := $(no-dot-config-targets) install dtbs_install \ 283 headers_install modules_install modules_sign kernelrelease image_name 284no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \ 285 image_name 286single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/ 287 288config-build := 289mixed-build := 290need-config := 1 291need-compiler := 1 292may-sync-config := 1 293single-build := 294 295ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 296 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 297 need-config := 298 endif 299endif 300 301ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),) 302 ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),) 303 need-compiler := 304 endif 305endif 306 307ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 308 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 309 may-sync-config := 310 endif 311endif 312 313ifneq ($(KBUILD_EXTMOD),) 314 may-sync-config := 315endif 316 317ifeq ($(KBUILD_EXTMOD),) 318 ifneq ($(filter %config,$(MAKECMDGOALS)),) 319 config-build := 1 320 ifneq ($(words $(MAKECMDGOALS)),1) 321 mixed-build := 1 322 endif 323 endif 324endif 325 326# We cannot build single targets and the others at the same time 327ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 328 single-build := 1 329 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 330 mixed-build := 1 331 endif 332endif 333 334# For "make -j clean all", "make -j mrproper defconfig all", etc. 335ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 336 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 337 mixed-build := 1 338 endif 339endif 340 341# install and modules_install need also be processed one by one 342ifneq ($(filter install,$(MAKECMDGOALS)),) 343 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 344 mixed-build := 1 345 endif 346endif 347 348ifdef mixed-build 349# =========================================================================== 350# We're called with mixed targets (*config and build targets). 351# Handle them one by one. 352 353PHONY += $(MAKECMDGOALS) __build_one_by_one 354 355$(MAKECMDGOALS): __build_one_by_one 356 @: 357 358__build_one_by_one: 359 $(Q)set -e; \ 360 for i in $(MAKECMDGOALS); do \ 361 $(MAKE) -f $(srctree)/Makefile $$i; \ 362 done 363 364else # !mixed-build 365 366include $(srctree)/scripts/Kbuild.include 367 368# Read KERNELRELEASE from include/config/kernel.release (if it exists) 369KERNELRELEASE = $(call read-file, include/config/kernel.release) 370KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 371export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 372 373include $(srctree)/scripts/subarch.include 374 375# Cross compiling and selecting different set of gcc/bin-utils 376# --------------------------------------------------------------------------- 377# 378# When performing cross compilation for other architectures ARCH shall be set 379# to the target architecture. (See arch/* for the possibilities). 380# ARCH can be set during invocation of make: 381# make ARCH=ia64 382# Another way is to have ARCH set in the environment. 383# The default ARCH is the host where make is executed. 384 385# CROSS_COMPILE specify the prefix used for all executables used 386# during compilation. Only gcc and related bin-utils executables 387# are prefixed with $(CROSS_COMPILE). 388# CROSS_COMPILE can be set on the command line 389# make CROSS_COMPILE=ia64-linux- 390# Alternatively CROSS_COMPILE can be set in the environment. 391# Default value for CROSS_COMPILE is not to prefix executables 392# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 393ARCH ?= $(SUBARCH) 394 395# Architecture as present in compile.h 396UTS_MACHINE := $(ARCH) 397SRCARCH := $(ARCH) 398 399# Additional ARCH settings for x86 400ifeq ($(ARCH),i386) 401 SRCARCH := x86 402endif 403ifeq ($(ARCH),x86_64) 404 SRCARCH := x86 405endif 406 407# Additional ARCH settings for sparc 408ifeq ($(ARCH),sparc32) 409 SRCARCH := sparc 410endif 411ifeq ($(ARCH),sparc64) 412 SRCARCH := sparc 413endif 414 415# Additional ARCH settings for parisc 416ifeq ($(ARCH),parisc64) 417 SRCARCH := parisc 418endif 419 420export cross_compiling := 421ifneq ($(SRCARCH),$(SUBARCH)) 422cross_compiling := 1 423endif 424 425KCONFIG_CONFIG ?= .config 426export KCONFIG_CONFIG 427 428# SHELL used by kbuild 429CONFIG_SHELL := sh 430 431HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 432HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 433HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 434 435ifneq ($(LLVM),) 436ifneq ($(filter %/,$(LLVM)),) 437LLVM_PREFIX := $(LLVM) 438else ifneq ($(filter -%,$(LLVM)),) 439LLVM_SUFFIX := $(LLVM) 440endif 441 442HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 443HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 444else 445HOSTCC = gcc 446HOSTCXX = g++ 447endif 448HOSTRUSTC = rustc 449HOSTPKG_CONFIG = pkg-config 450 451KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 452 -O2 -fomit-frame-pointer -std=gnu11 453KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 454KBUILD_USERLDFLAGS := $(USERLDFLAGS) 455 456# These flags apply to all Rust code in the tree, including the kernel and 457# host programs. 458export rust_common_flags := --edition=2021 \ 459 -Zbinary_dep_depinfo=y \ 460 -Dunsafe_op_in_unsafe_fn -Drust_2018_idioms \ 461 -Dunreachable_pub -Dnon_ascii_idents \ 462 -Wmissing_docs \ 463 -Drustdoc::missing_crate_level_docs \ 464 -Dclippy::correctness -Dclippy::style \ 465 -Dclippy::suspicious -Dclippy::complexity \ 466 -Dclippy::perf \ 467 -Dclippy::let_unit_value -Dclippy::mut_mut \ 468 -Dclippy::needless_bitwise_bool \ 469 -Dclippy::needless_continue \ 470 -Dclippy::no_mangle_with_rust_abi \ 471 -Wclippy::dbg_macro 472 473KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 474KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 475KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 476 -Zallow-features= $(HOSTRUSTFLAGS) 477KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 478KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 479 480# Make variables (CC, etc...) 481CPP = $(CC) -E 482ifneq ($(LLVM),) 483CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 484LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 485AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 486NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 487OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 488OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 489READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 490STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 491else 492CC = $(CROSS_COMPILE)gcc 493LD = $(CROSS_COMPILE)ld 494AR = $(CROSS_COMPILE)ar 495NM = $(CROSS_COMPILE)nm 496OBJCOPY = $(CROSS_COMPILE)objcopy 497OBJDUMP = $(CROSS_COMPILE)objdump 498READELF = $(CROSS_COMPILE)readelf 499STRIP = $(CROSS_COMPILE)strip 500endif 501RUSTC = rustc 502RUSTDOC = rustdoc 503RUSTFMT = rustfmt 504CLIPPY_DRIVER = clippy-driver 505BINDGEN = bindgen 506CARGO = cargo 507PAHOLE = pahole 508RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 509LEX = flex 510YACC = bison 511AWK = awk 512INSTALLKERNEL := installkernel 513PERL = perl 514PYTHON3 = python3 515CHECK = sparse 516BASH = bash 517KGZIP = gzip 518KBZIP2 = bzip2 519KLZOP = lzop 520LZMA = lzma 521LZ4 = lz4 522XZ = xz 523ZSTD = zstd 524 525PAHOLE_FLAGS = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh) 526 527CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 528 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 529NOSTDINC_FLAGS := 530CFLAGS_MODULE = 531RUSTFLAGS_MODULE = 532AFLAGS_MODULE = 533LDFLAGS_MODULE = 534CFLAGS_KERNEL = 535RUSTFLAGS_KERNEL = 536AFLAGS_KERNEL = 537LDFLAGS_vmlinux = 538 539# Use USERINCLUDE when you must reference the UAPI directories only. 540USERINCLUDE := \ 541 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 542 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 543 -I$(srctree)/include/uapi \ 544 -I$(objtree)/include/generated/uapi \ 545 -include $(srctree)/include/linux/compiler-version.h \ 546 -include $(srctree)/include/linux/kconfig.h 547 548# Use LINUXINCLUDE when you must reference the include/ directory. 549# Needed to be compatible with the O= option 550LINUXINCLUDE := \ 551 -I$(srctree)/arch/$(SRCARCH)/include \ 552 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 553 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 554 -I$(objtree)/include \ 555 $(USERINCLUDE) 556 557KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 558 559KBUILD_CFLAGS := 560KBUILD_CFLAGS += -std=gnu11 561KBUILD_CFLAGS += -fshort-wchar 562KBUILD_CFLAGS += -funsigned-char 563KBUILD_CFLAGS += -fno-common 564KBUILD_CFLAGS += -fno-PIE 565KBUILD_CFLAGS += -fno-strict-aliasing 566 567KBUILD_CPPFLAGS := -D__KERNEL__ 568KBUILD_RUSTFLAGS := $(rust_common_flags) \ 569 --target=$(objtree)/scripts/target.json \ 570 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 571 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 572 -Csymbol-mangling-version=v0 \ 573 -Crelocation-model=static \ 574 -Zfunction-sections=n \ 575 -Dclippy::float_arithmetic 576 577KBUILD_AFLAGS_KERNEL := 578KBUILD_CFLAGS_KERNEL := 579KBUILD_RUSTFLAGS_KERNEL := 580KBUILD_AFLAGS_MODULE := -DMODULE 581KBUILD_CFLAGS_MODULE := -DMODULE 582KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 583KBUILD_LDFLAGS_MODULE := 584KBUILD_LDFLAGS := 585CLANG_FLAGS := 586 587ifeq ($(KBUILD_CLIPPY),1) 588 RUSTC_OR_CLIPPY_QUIET := CLIPPY 589 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 590else 591 RUSTC_OR_CLIPPY_QUIET := RUSTC 592 RUSTC_OR_CLIPPY = $(RUSTC) 593endif 594 595ifdef RUST_LIB_SRC 596 export RUST_LIB_SRC 597endif 598 599# Allows the usage of unstable features in stable compilers. 600export RUSTC_BOOTSTRAP := 1 601 602export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 603export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO 604export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 605export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 606export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 607export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 608export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 609export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 610 611export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 612export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 613export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 614export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 615export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 616export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 617export PAHOLE_FLAGS 618 619# Files to ignore in find ... statements 620 621export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 622 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 623 -prune -o 624export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 625 --exclude CVS --exclude .pc --exclude .hg --exclude .git 626 627# =========================================================================== 628# Rules shared between *config targets and build targets 629 630# Basic helpers built in scripts/basic/ 631PHONY += scripts_basic 632scripts_basic: 633 $(Q)$(MAKE) $(build)=scripts/basic 634 635PHONY += outputmakefile 636ifdef building_out_of_srctree 637# Before starting out-of-tree build, make sure the source tree is clean. 638# outputmakefile generates a Makefile in the output directory, if using a 639# separate output directory. This allows convenient use of make in the 640# output directory. 641# At the same time when output Makefile generated, generate .gitignore to 642# ignore whole output directory 643 644quiet_cmd_makefile = GEN Makefile 645 cmd_makefile = { \ 646 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 647 echo "include $(srctree)/Makefile"; \ 648 } > Makefile 649 650outputmakefile: 651 @if [ -f $(srctree)/.config -o \ 652 -d $(srctree)/include/config -o \ 653 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 654 echo >&2 "***"; \ 655 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 656 echo >&2 "*** in $(abs_srctree)";\ 657 echo >&2 "***"; \ 658 false; \ 659 fi 660 $(Q)ln -fsn $(srctree) source 661 $(call cmd,makefile) 662 $(Q)test -e .gitignore || \ 663 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 664endif 665 666# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 667# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 668# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 669# and from include/config/auto.conf.cmd to detect the compiler upgrade. 670CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 671 672ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 673include $(srctree)/scripts/Makefile.clang 674endif 675 676# Include this also for config targets because some architectures need 677# cc-cross-prefix to determine CROSS_COMPILE. 678ifdef need-compiler 679include $(srctree)/scripts/Makefile.compiler 680endif 681 682ifdef config-build 683# =========================================================================== 684# *config targets only - make sure prerequisites are updated, and descend 685# in scripts/kconfig to make the *config target 686 687# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 688# KBUILD_DEFCONFIG may point out an alternative default configuration 689# used for 'make defconfig' 690include $(srctree)/arch/$(SRCARCH)/Makefile 691export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 692 693config: outputmakefile scripts_basic FORCE 694 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 695 696%config: outputmakefile scripts_basic FORCE 697 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 698 699else #!config-build 700# =========================================================================== 701# Build targets only - this includes vmlinux, arch specific targets, clean 702# targets and others. In general all targets except *config targets. 703 704# If building an external module we do not care about the all: rule 705# but instead __all depend on modules 706PHONY += all 707ifeq ($(KBUILD_EXTMOD),) 708__all: all 709else 710__all: modules 711endif 712 713targets := 714 715# Decide whether to build built-in, modular, or both. 716# Normally, just do built-in. 717 718KBUILD_MODULES := 719KBUILD_BUILTIN := 1 720 721# If we have only "make modules", don't compile built-in objects. 722ifeq ($(MAKECMDGOALS),modules) 723 KBUILD_BUILTIN := 724endif 725 726# If we have "make <whatever> modules", compile modules 727# in addition to whatever we do anyway. 728# Just "make" or "make all" shall build modules as well 729 730ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 731 KBUILD_MODULES := 1 732endif 733 734ifeq ($(MAKECMDGOALS),) 735 KBUILD_MODULES := 1 736endif 737 738export KBUILD_MODULES KBUILD_BUILTIN 739 740ifdef need-config 741include include/config/auto.conf 742endif 743 744ifeq ($(KBUILD_EXTMOD),) 745# Objects we will link into vmlinux / subdirs we need to visit 746core-y := 747drivers-y := 748libs-y := lib/ 749endif # KBUILD_EXTMOD 750 751# The all: target is the default when no target is given on the 752# command line. 753# This allow a user to issue only 'make' to build a kernel including modules 754# Defaults to vmlinux, but the arch makefile usually adds further targets 755all: vmlinux 756 757CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 758ifdef CONFIG_CC_IS_GCC 759CFLAGS_GCOV += -fno-tree-loop-im 760endif 761export CFLAGS_GCOV 762 763# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 764ifdef CONFIG_FUNCTION_TRACER 765 CC_FLAGS_FTRACE := -pg 766endif 767 768include $(srctree)/arch/$(SRCARCH)/Makefile 769 770ifdef need-config 771ifdef may-sync-config 772# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 773# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 774# because some architectures define CROSS_COMPILE there. 775include include/config/auto.conf.cmd 776 777$(KCONFIG_CONFIG): 778 @echo >&2 '***' 779 @echo >&2 '*** Configuration file "$@" not found!' 780 @echo >&2 '***' 781 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 782 @echo >&2 '*** "make menuconfig" or "make xconfig").' 783 @echo >&2 '***' 784 @/bin/false 785 786# The actual configuration files used during the build are stored in 787# include/generated/ and include/config/. Update them if .config is newer than 788# include/config/auto.conf (which mirrors .config). 789# 790# This exploits the 'multi-target pattern rule' trick. 791# The syncconfig should be executed only once to make all the targets. 792# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 793# 794# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 795# so you cannot notice that Kconfig is waiting for the user input. 796%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 797 $(Q)$(kecho) " SYNC $@" 798 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 799else # !may-sync-config 800# External modules and some install targets need include/generated/autoconf.h 801# and include/config/auto.conf but do not care if they are up-to-date. 802# Use auto.conf to trigger the test 803PHONY += include/config/auto.conf 804 805include/config/auto.conf: 806 @test -e include/generated/autoconf.h -a -e $@ || ( \ 807 echo >&2; \ 808 echo >&2 " ERROR: Kernel configuration is invalid."; \ 809 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 810 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 811 echo >&2 ; \ 812 /bin/false) 813 814endif # may-sync-config 815endif # need-config 816 817KBUILD_CFLAGS += -fno-delete-null-pointer-checks 818 819ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 820KBUILD_CFLAGS += -O2 821KBUILD_RUSTFLAGS += -Copt-level=2 822else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 823KBUILD_CFLAGS += -Os 824KBUILD_RUSTFLAGS += -Copt-level=s 825endif 826 827# Always set `debug-assertions` and `overflow-checks` because their default 828# depends on `opt-level` and `debug-assertions`, respectively. 829KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 830KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 831 832# Tell gcc to never replace conditional load with a non-conditional one 833ifdef CONFIG_CC_IS_GCC 834# gcc-10 renamed --param=allow-store-data-races=0 to 835# -fno-allow-store-data-races. 836KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 837KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 838endif 839 840ifdef CONFIG_READABLE_ASM 841# Disable optimizations that make assembler listings hard to read. 842# reorder blocks reorders the control in the function 843# ipa clone creates specialized cloned functions 844# partial inlining inlines only parts of functions 845KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 846endif 847 848stackp-flags-y := -fno-stack-protector 849stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 850stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 851 852KBUILD_CFLAGS += $(stackp-flags-y) 853 854KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings 855KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) 856 857ifdef CONFIG_FRAME_POINTER 858KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 859KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 860else 861# Some targets (ARM with Thumb2, for example), can't be built with frame 862# pointers. For those, we don't have FUNCTION_TRACER automatically 863# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 864# incompatible with -fomit-frame-pointer with current GCC, so we don't use 865# -fomit-frame-pointer with FUNCTION_TRACER. 866# In the Rust target specification, "frame-pointer" is set explicitly 867# to "may-omit". 868ifndef CONFIG_FUNCTION_TRACER 869KBUILD_CFLAGS += -fomit-frame-pointer 870endif 871endif 872 873# Initialize all stack variables with a 0xAA pattern. 874ifdef CONFIG_INIT_STACK_ALL_PATTERN 875KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 876endif 877 878# Initialize all stack variables with a zero value. 879ifdef CONFIG_INIT_STACK_ALL_ZERO 880KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 881ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 882# https://github.com/llvm/llvm-project/issues/44842 883CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 884export CC_AUTO_VAR_INIT_ZERO_ENABLER 885KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 886endif 887endif 888 889# While VLAs have been removed, GCC produces unreachable stack probes 890# for the randomize_kstack_offset feature. Disable it for all compilers. 891KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 892 893# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 894ifdef CONFIG_ZERO_CALL_USED_REGS 895KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 896endif 897 898ifdef CONFIG_FUNCTION_TRACER 899ifdef CONFIG_FTRACE_MCOUNT_USE_CC 900 CC_FLAGS_FTRACE += -mrecord-mcount 901 ifdef CONFIG_HAVE_NOP_MCOUNT 902 ifeq ($(call cc-option-yn, -mnop-mcount),y) 903 CC_FLAGS_FTRACE += -mnop-mcount 904 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 905 endif 906 endif 907endif 908ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 909 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 910 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 911 endif 912endif 913ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 914 ifdef CONFIG_HAVE_C_RECORDMCOUNT 915 BUILD_C_RECORDMCOUNT := y 916 export BUILD_C_RECORDMCOUNT 917 endif 918endif 919ifdef CONFIG_HAVE_FENTRY 920 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 921 ifeq ($(call cc-option-yn, -mfentry),y) 922 CC_FLAGS_FTRACE += -mfentry 923 CC_FLAGS_USING += -DCC_USING_FENTRY 924 endif 925endif 926export CC_FLAGS_FTRACE 927KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 928KBUILD_AFLAGS += $(CC_FLAGS_USING) 929endif 930 931# We trigger additional mismatches with less inlining 932ifdef CONFIG_DEBUG_SECTION_MISMATCH 933KBUILD_CFLAGS += -fno-inline-functions-called-once 934endif 935 936# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 937ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 938KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 939KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 940LDFLAGS_vmlinux += --gc-sections 941endif 942 943ifdef CONFIG_SHADOW_CALL_STACK 944ifndef CONFIG_DYNAMIC_SCS 945CC_FLAGS_SCS := -fsanitize=shadow-call-stack 946KBUILD_CFLAGS += $(CC_FLAGS_SCS) 947endif 948export CC_FLAGS_SCS 949endif 950 951ifdef CONFIG_LTO_CLANG 952ifdef CONFIG_LTO_CLANG_THIN 953CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 954else 955CC_FLAGS_LTO := -flto 956endif 957CC_FLAGS_LTO += -fvisibility=hidden 958 959# Limit inlining across translation units to reduce binary size 960KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 961 962# Check for frame size exceeding threshold during prolog/epilog insertion 963# when using lld < 13.0.0. 964ifneq ($(CONFIG_FRAME_WARN),0) 965ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 130000),y) 966KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) 967endif 968endif 969endif 970 971ifdef CONFIG_LTO 972KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 973KBUILD_AFLAGS += -fno-lto 974export CC_FLAGS_LTO 975endif 976 977ifdef CONFIG_CFI_CLANG 978CC_FLAGS_CFI := -fsanitize=kcfi 979KBUILD_CFLAGS += $(CC_FLAGS_CFI) 980export CC_FLAGS_CFI 981endif 982 983ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 984KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 985endif 986 987# arch Makefile may override CC so keep this after arch Makefile is included 988NOSTDINC_FLAGS += -nostdinc 989 990# To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 991# the kernel uses only C99 flexible arrays for dynamically sized trailing 992# arrays. Enforce this for everything that may examine structure sizes and 993# perform bounds checking. 994KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 995 996# disable invalid "can't wrap" optimizations for signed / pointers 997KBUILD_CFLAGS += -fno-strict-overflow 998 999# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1000KBUILD_CFLAGS += -fno-stack-check 1001 1002# conserve stack if available 1003ifdef CONFIG_CC_IS_GCC 1004KBUILD_CFLAGS += -fconserve-stack 1005endif 1006 1007# Ensure compilers do not transform certain loops into calls to wcslen() 1008KBUILD_CFLAGS += -fno-builtin-wcslen 1009 1010# change __FILE__ to the relative path from the srctree 1011KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1012 1013# include additional Makefiles when needed 1014include-y := scripts/Makefile.extrawarn 1015include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1016include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1017include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1018include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1019include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1020include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1021include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1022include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1023 1024include $(addprefix $(srctree)/, $(include-y)) 1025 1026# scripts/Makefile.gcc-plugins is intentionally included last. 1027# Do not add $(call cc-option,...) below this line. When you build the kernel 1028# from the clean source tree, the GCC plugins do not exist at this point. 1029 1030# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1031KBUILD_CPPFLAGS += $(KCPPFLAGS) 1032KBUILD_AFLAGS += $(KAFLAGS) 1033KBUILD_CFLAGS += $(KCFLAGS) 1034KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1035 1036KBUILD_LDFLAGS_MODULE += --build-id=sha1 1037LDFLAGS_vmlinux += --build-id=sha1 1038 1039KBUILD_LDFLAGS += -z noexecstack 1040ifeq ($(CONFIG_LD_IS_BFD),y) 1041KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1042endif 1043 1044ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1045LDFLAGS_vmlinux += -X 1046endif 1047 1048ifeq ($(CONFIG_RELR),y) 1049# ld.lld before 15 did not support -z pack-relative-relocs. 1050LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1051endif 1052 1053# We never want expected sections to be placed heuristically by the 1054# linker. All sections should be explicitly named in the linker script. 1055ifdef CONFIG_LD_ORPHAN_WARN 1056LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1057endif 1058 1059# Align the bit size of userspace programs with the kernel 1060KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1061KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) 1062 1063# userspace programs are linked via the compiler, use the correct linker 1064ifeq ($(CONFIG_CC_IS_CLANG)$(CONFIG_LD_IS_LLD),yy) 1065KBUILD_USERLDFLAGS += $(call cc-option, --ld-path=$(LD)) 1066endif 1067 1068# make the checker run with the right architecture 1069CHECKFLAGS += --arch=$(ARCH) 1070 1071# insure the checker run with the right endianness 1072CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1073 1074# the checker needs the correct machine size 1075CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1076 1077# Default kernel image to build when no specific target is given. 1078# KBUILD_IMAGE may be overruled on the command line or 1079# set in the environment 1080# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1081# this default value 1082export KBUILD_IMAGE ?= vmlinux 1083 1084# 1085# INSTALL_PATH specifies where to place the updated kernel and system map 1086# images. Default is /boot, but you can set it to other values 1087export INSTALL_PATH ?= /boot 1088 1089# 1090# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1091# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1092# an argument if needed. Otherwise it defaults to the kernel install path 1093# 1094export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1095 1096# 1097# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1098# relocations required by build roots. This is not defined in the 1099# makefile but the argument can be passed to make if needed. 1100# 1101 1102MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1103export MODLIB 1104 1105PHONY += prepare0 1106 1107export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1108export MODORDER := $(extmod_prefix)modules.order 1109export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1110 1111ifeq ($(KBUILD_EXTMOD),) 1112 1113build-dir := . 1114clean-dirs := $(sort . Documentation \ 1115 $(patsubst %/,%,$(filter %/, $(core-) \ 1116 $(drivers-) $(libs-)))) 1117 1118export ARCH_CORE := $(core-y) 1119export ARCH_LIB := $(filter %/, $(libs-y)) 1120export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1121# Externally visible symbols (used by link-vmlinux.sh) 1122 1123KBUILD_VMLINUX_OBJS := ./built-in.a 1124ifdef CONFIG_MODULES 1125KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1126KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1127else 1128KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1129endif 1130 1131export KBUILD_VMLINUX_LIBS 1132export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1133 1134ifdef CONFIG_TRIM_UNUSED_KSYMS 1135# For the kernel to actually contain only the needed exported symbols, 1136# we have to build modules as well to determine what those symbols are. 1137KBUILD_MODULES := 1 1138endif 1139 1140# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1141quiet_cmd_ar_vmlinux.a = AR $@ 1142 cmd_ar_vmlinux.a = \ 1143 rm -f $@; \ 1144 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1145 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1146 1147targets += vmlinux.a 1148vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1149 $(call if_changed,ar_vmlinux.a) 1150 1151PHONY += vmlinux_o 1152vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1153 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1154 1155vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1156 @: 1157 1158PHONY += vmlinux 1159# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1160# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1161# unrelated; the decompressors just happen to have the same base name, 1162# arch/*/boot/compressed/vmlinux. 1163# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1164# 1165# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1166# https://savannah.gnu.org/bugs/?61463 1167# For Make > 4.4, the following simple code will work: 1168# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1169vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1170vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1171vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1172 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1173 1174# The actual objects are generated when descending, 1175# make sure no implicit rule kicks in 1176$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1177 1178ifeq ($(origin KERNELRELEASE),file) 1179filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1180else 1181filechk_kernel.release = echo $(KERNELRELEASE) 1182endif 1183 1184# Store (new) KERNELRELEASE string in include/config/kernel.release 1185include/config/kernel.release: FORCE 1186 $(call filechk,kernel.release) 1187 1188# Additional helpers built in scripts/ 1189# Carefully list dependencies so we do not try to build scripts twice 1190# in parallel 1191PHONY += scripts 1192scripts: scripts_basic scripts_dtc 1193 $(Q)$(MAKE) $(build)=$(@) 1194 1195# Things we need to do before we recursively start building the kernel 1196# or the modules are listed in "prepare". 1197# A multi level approach is used. prepareN is processed before prepareN-1. 1198# archprepare is used in arch Makefiles and when processed asm symlink, 1199# version.h and scripts_basic is processed / created. 1200 1201PHONY += prepare archprepare 1202 1203archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1204 asm-generic $(version_h) include/generated/utsrelease.h \ 1205 include/generated/compile.h include/generated/autoconf.h remove-stale-files 1206 1207prepare0: archprepare 1208 $(Q)$(MAKE) $(build)=scripts/mod 1209 $(Q)$(MAKE) $(build)=. prepare 1210 1211# All the preparing.. 1212prepare: prepare0 1213ifdef CONFIG_RUST 1214 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1215 $(Q)$(MAKE) $(build)=rust 1216endif 1217 1218PHONY += remove-stale-files 1219remove-stale-files: 1220 $(Q)$(srctree)/scripts/remove-stale-files 1221 1222# Support for using generic headers in asm-generic 1223asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1224 1225PHONY += asm-generic uapi-asm-generic 1226asm-generic: uapi-asm-generic 1227 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1228 generic=include/asm-generic 1229uapi-asm-generic: 1230 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1231 generic=include/uapi/asm-generic 1232 1233# Generate some files 1234# --------------------------------------------------------------------------- 1235 1236# KERNELRELEASE can change from a few different places, meaning version.h 1237# needs to be updated, so this check is forced on all builds 1238 1239uts_len := 64 1240define filechk_utsrelease.h 1241 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1242 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1243 exit 1; \ 1244 fi; \ 1245 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1246endef 1247 1248define filechk_version.h 1249 if [ $(SUBLEVEL) -gt 255 ]; then \ 1250 echo \#define LINUX_VERSION_CODE $(shell \ 1251 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1252 else \ 1253 echo \#define LINUX_VERSION_CODE $(shell \ 1254 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1255 fi; \ 1256 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1257 ((c) > 255 ? 255 : (c)))'; \ 1258 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1259 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1260 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1261endef 1262 1263$(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1264$(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0) 1265$(version_h): FORCE 1266 $(call filechk,version.h) 1267 1268include/generated/utsrelease.h: include/config/kernel.release FORCE 1269 $(call filechk,utsrelease.h) 1270 1271filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1272 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1273 1274include/generated/compile.h: FORCE 1275 $(call filechk,compile.h) 1276 1277PHONY += headerdep 1278headerdep: 1279 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1280 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1281 1282# --------------------------------------------------------------------------- 1283# Kernel headers 1284 1285#Default location for installed headers 1286export INSTALL_HDR_PATH = $(objtree)/usr 1287 1288quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1289 cmd_headers_install = \ 1290 mkdir -p $(INSTALL_HDR_PATH); \ 1291 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1292 usr/include $(INSTALL_HDR_PATH) 1293 1294PHONY += headers_install 1295headers_install: headers 1296 $(call cmd,headers_install) 1297 1298PHONY += archheaders archscripts 1299 1300hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1301 1302PHONY += headers 1303headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1304 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML)) 1305 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1306 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1307 1308ifdef CONFIG_HEADERS_INSTALL 1309prepare: headers 1310endif 1311 1312PHONY += scripts_unifdef 1313scripts_unifdef: scripts_basic 1314 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1315 1316# --------------------------------------------------------------------------- 1317# Install 1318 1319# Many distributions have the custom install script, /sbin/installkernel. 1320# If DKMS is installed, 'make install' will eventually recurse back 1321# to this Makefile to build and install external modules. 1322# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1323 1324quiet_cmd_install = INSTALL $(INSTALL_PATH) 1325 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1326 1327# --------------------------------------------------------------------------- 1328# vDSO install 1329 1330PHONY += vdso_install 1331vdso_install: export INSTALL_FILES = $(vdso-install-y) 1332vdso_install: 1333 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1334 1335# --------------------------------------------------------------------------- 1336# Tools 1337 1338ifdef CONFIG_OBJTOOL 1339prepare: tools/objtool 1340endif 1341 1342ifdef CONFIG_BPF 1343ifdef CONFIG_DEBUG_INFO_BTF 1344prepare: tools/bpf/resolve_btfids 1345endif 1346endif 1347 1348PHONY += resolve_btfids_clean 1349 1350resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1351 1352# tools/bpf/resolve_btfids directory might not exist 1353# in output directory, skip its clean in that case 1354resolve_btfids_clean: 1355ifneq ($(wildcard $(resolve_btfids_O)),) 1356 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1357endif 1358 1359tools/: FORCE 1360 $(Q)mkdir -p $(objtree)/tools 1361 $(Q)$(MAKE) LDFLAGS= O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1362 1363tools/%: FORCE 1364 $(Q)mkdir -p $(objtree)/tools 1365 $(Q)$(MAKE) LDFLAGS= O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1366 1367# --------------------------------------------------------------------------- 1368# Kernel selftest 1369 1370PHONY += kselftest 1371kselftest: headers 1372 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1373 1374kselftest-%: headers FORCE 1375 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1376 1377PHONY += kselftest-merge 1378kselftest-merge: 1379 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1380 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1381 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1382 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1383 1384# --------------------------------------------------------------------------- 1385# Devicetree files 1386 1387ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1388dtstree := arch/$(SRCARCH)/boot/dts 1389endif 1390 1391ifneq ($(dtstree),) 1392 1393%.dtb: dtbs_prepare 1394 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1395 1396%.dtbo: dtbs_prepare 1397 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1398 1399PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1400dtbs: dtbs_prepare 1401 $(Q)$(MAKE) $(build)=$(dtstree) 1402 1403# include/config/kernel.release is actually needed when installing DTBs because 1404# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1405# dtbs_install depend on it as dtbs_install may run as root. 1406dtbs_prepare: include/config/kernel.release scripts_dtc 1407 1408ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1409export CHECK_DTBS=y 1410endif 1411 1412ifneq ($(CHECK_DTBS),) 1413dtbs_prepare: dt_binding_check 1414endif 1415 1416dtbs_check: dtbs 1417 1418dtbs_install: 1419 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1420 1421ifdef CONFIG_OF_EARLY_FLATTREE 1422all: dtbs 1423endif 1424 1425endif 1426 1427PHONY += scripts_dtc 1428scripts_dtc: scripts_basic 1429 $(Q)$(MAKE) $(build)=scripts/dtc 1430 1431ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1432export CHECK_DT_BINDING=y 1433endif 1434 1435PHONY += dt_binding_check 1436dt_binding_check: scripts_dtc 1437 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1438 1439PHONY += dt_compatible_check 1440dt_compatible_check: dt_binding_check 1441 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1442 1443# --------------------------------------------------------------------------- 1444# Modules 1445 1446ifdef CONFIG_MODULES 1447 1448# By default, build modules as well 1449 1450all: modules 1451 1452# When we're building modules with modversions, we need to consider 1453# the built-in objects during the descend as well, in order to 1454# make sure the checksums are up to date before we record them. 1455ifdef CONFIG_MODVERSIONS 1456 KBUILD_BUILTIN := 1 1457endif 1458 1459# Build modules 1460# 1461 1462# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1463# is an exception. 1464ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1465KBUILD_BUILTIN := 1 1466modules: vmlinux 1467endif 1468 1469modules: modules_prepare 1470 1471# Target to prepare building external modules 1472modules_prepare: prepare 1473 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1474 1475endif # CONFIG_MODULES 1476 1477### 1478# Cleaning is done on three levels. 1479# make clean Delete most generated files 1480# Leave enough to build external modules 1481# make mrproper Delete the current configuration, and all generated files 1482# make distclean Remove editor backup files, patch leftover files and the like 1483 1484# Directories & files removed with 'make clean' 1485CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1486 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1487 compile_commands.json rust/test \ 1488 rust-project.json .vmlinux.objs .vmlinux.export.c 1489 1490# Directories & files removed with 'make mrproper' 1491MRPROPER_FILES += include/config include/generated \ 1492 arch/$(SRCARCH)/include/generated .objdiff \ 1493 debian snap tar-install \ 1494 .config .config.old .version \ 1495 Module.symvers \ 1496 certs/signing_key.pem \ 1497 certs/x509.genkey \ 1498 vmlinux-gdb.py \ 1499 kernel.spec rpmbuild \ 1500 rust/libmacros.so 1501 1502# clean - Delete most, but leave enough to build external modules 1503# 1504clean: rm-files := $(CLEAN_FILES) 1505 1506PHONY += archclean vmlinuxclean 1507 1508vmlinuxclean: 1509 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1510 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1511 1512clean: archclean vmlinuxclean resolve_btfids_clean 1513 1514# mrproper - Delete all generated files, including .config 1515# 1516mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1517mrproper-dirs := $(addprefix _mrproper_,scripts) 1518 1519PHONY += $(mrproper-dirs) mrproper 1520$(mrproper-dirs): 1521 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1522 1523mrproper: clean $(mrproper-dirs) 1524 $(call cmd,rmfiles) 1525 @find . $(RCS_FIND_IGNORE) \ 1526 \( -name '*.rmeta' \) \ 1527 -type f -print | xargs rm -f 1528 1529# distclean 1530# 1531PHONY += distclean 1532 1533distclean: mrproper 1534 @find . $(RCS_FIND_IGNORE) \ 1535 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1536 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1537 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1538 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1539 -type f -print | xargs rm -f 1540 1541 1542# Packaging of the kernel to various formats 1543# --------------------------------------------------------------------------- 1544 1545%src-pkg: FORCE 1546 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1547%pkg: include/config/kernel.release FORCE 1548 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1549 1550# Brief documentation of the typical targets used 1551# --------------------------------------------------------------------------- 1552 1553boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1554boards := $(sort $(notdir $(boards))) 1555board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1556board-dirs := $(sort $(notdir $(board-dirs:/=))) 1557 1558PHONY += help 1559help: 1560 @echo 'Cleaning targets:' 1561 @echo ' clean - Remove most generated files but keep the config and' 1562 @echo ' enough build support to build external modules' 1563 @echo ' mrproper - Remove all generated files + config + various backup files' 1564 @echo ' distclean - mrproper + remove editor backup and patch files' 1565 @echo '' 1566 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1567 @echo '' 1568 @echo 'Other generic targets:' 1569 @echo ' all - Build all targets marked with [*]' 1570 @echo '* vmlinux - Build the bare kernel' 1571 @echo '* modules - Build all modules' 1572 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1573 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1574 @echo ' dir/ - Build all files in dir and below' 1575 @echo ' dir/file.[ois] - Build specified target only' 1576 @echo ' dir/file.ll - Build the LLVM assembly file' 1577 @echo ' (requires compiler support for LLVM assembly generation)' 1578 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1579 @echo ' (requires a recent binutils and recent build (System.map))' 1580 @echo ' dir/file.ko - Build module including final link' 1581 @echo ' modules_prepare - Set up for building external modules' 1582 @echo ' tags/TAGS - Generate tags file for editors' 1583 @echo ' cscope - Generate cscope index' 1584 @echo ' gtags - Generate GNU GLOBAL index' 1585 @echo ' kernelrelease - Output the release version string (use with make -s)' 1586 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1587 @echo ' image_name - Output the image name (use with make -s)' 1588 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1589 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1590 echo '' 1591 @echo 'Static analysers:' 1592 @echo ' checkstack - Generate a list of stack hogs' 1593 @echo ' versioncheck - Sanity check on version.h usage' 1594 @echo ' includecheck - Check for duplicate included header files' 1595 @echo ' export_report - List the usages of all exported symbols' 1596 @echo ' headerdep - Detect inclusion cycles in headers' 1597 @echo ' coccicheck - Check with Coccinelle' 1598 @echo ' clang-analyzer - Check with clang static analyzer' 1599 @echo ' clang-tidy - Check with clang-tidy' 1600 @echo '' 1601 @echo 'Tools:' 1602 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1603 @echo '' 1604 @echo 'Kernel selftest:' 1605 @echo ' kselftest - Build and run kernel selftest' 1606 @echo ' Build, install, and boot kernel before' 1607 @echo ' running kselftest on it' 1608 @echo ' Run as root for full coverage' 1609 @echo ' kselftest-all - Build kernel selftest' 1610 @echo ' kselftest-install - Build and install kernel selftest' 1611 @echo ' kselftest-clean - Remove all generated kselftest files' 1612 @echo ' kselftest-merge - Merge all the config dependencies of' 1613 @echo ' kselftest to existing .config.' 1614 @echo '' 1615 @echo 'Rust targets:' 1616 @echo ' rustavailable - Checks whether the Rust toolchain is' 1617 @echo ' available and, if not, explains why.' 1618 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1619 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1620 @echo ' is formatted, printing a diff otherwise.' 1621 @echo ' rustdoc - Generate Rust documentation' 1622 @echo ' (requires kernel .config)' 1623 @echo ' rusttest - Runs the Rust tests' 1624 @echo ' (requires kernel .config; downloads external repos)' 1625 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1626 @echo ' (requires kernel .config)' 1627 @echo ' dir/file.[os] - Build specified target only' 1628 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1629 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1630 @echo ' The output is not intended to be compilable.' 1631 @echo ' dir/file.ll - Build the LLVM assembly file' 1632 @echo '' 1633 @$(if $(dtstree), \ 1634 echo 'Devicetree:'; \ 1635 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1636 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1637 echo ' dt_binding_check - Validate device tree binding documents'; \ 1638 echo ' dtbs_check - Validate device tree source files';\ 1639 echo '') 1640 1641 @echo 'Userspace tools targets:' 1642 @echo ' use "make tools/help"' 1643 @echo ' or "cd tools; make help"' 1644 @echo '' 1645 @echo 'Kernel packaging:' 1646 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1647 @echo '' 1648 @echo 'Documentation targets:' 1649 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1650 @echo '' 1651 @echo 'Architecture specific targets ($(SRCARCH)):' 1652 @$(or $(archhelp),\ 1653 echo ' No architecture specific help defined for $(SRCARCH)') 1654 @echo '' 1655 @$(if $(boards), \ 1656 $(foreach b, $(boards), \ 1657 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1658 echo '') 1659 @$(if $(board-dirs), \ 1660 $(foreach b, $(board-dirs), \ 1661 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1662 printf " %-16s - Show all of the above\\n" help-boards; \ 1663 echo '') 1664 1665 @echo ' make V=n [targets] 1: verbose build' 1666 @echo ' 2: give reason for rebuild of target' 1667 @echo ' V=1 and V=2 can be combined with V=12' 1668 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1669 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1670 @echo ' (sparse by default)' 1671 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1672 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1673 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1674 @echo ' 1: warnings which may be relevant and do not occur too often' 1675 @echo ' 2: warnings which occur quite often but may still be relevant' 1676 @echo ' 3: more obscure warnings, can most likely be ignored' 1677 @echo ' e: warnings are being treated as errors' 1678 @echo ' Multiple levels can be combined with W=12 or W=123' 1679 @$(if $(dtstree), \ 1680 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1681 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1682 ) 1683 @echo '' 1684 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1685 @echo 'For further info see the ./README file' 1686 1687 1688help-board-dirs := $(addprefix help-,$(board-dirs)) 1689 1690help-boards: $(help-board-dirs) 1691 1692boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1693 1694$(help-board-dirs): help-%: 1695 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1696 @$(if $(boards-per-dir), \ 1697 $(foreach b, $(boards-per-dir), \ 1698 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1699 echo '') 1700 1701 1702# Documentation targets 1703# --------------------------------------------------------------------------- 1704DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1705 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs 1706PHONY += $(DOC_TARGETS) 1707$(DOC_TARGETS): 1708 $(Q)$(MAKE) $(build)=Documentation $@ 1709 1710 1711# Rust targets 1712# --------------------------------------------------------------------------- 1713 1714# "Is Rust available?" target 1715PHONY += rustavailable 1716rustavailable: 1717 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1718 1719# Documentation target 1720# 1721# Using the singular to avoid running afoul of `no-dot-config-targets`. 1722PHONY += rustdoc 1723rustdoc: prepare 1724 $(Q)$(MAKE) $(build)=rust $@ 1725 1726# Testing target 1727PHONY += rusttest 1728rusttest: prepare 1729 $(Q)$(MAKE) $(build)=rust $@ 1730 1731# Formatting targets 1732PHONY += rustfmt rustfmtcheck 1733 1734# We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream. 1735# 1736# We match using absolute paths since `find` does not resolve them 1737# when matching, which is a problem when e.g. `srctree` is `..`. 1738# We `grep` afterwards in order to remove the directory entry itself. 1739rustfmt: 1740 $(Q)find $(abs_srctree) -type f -name '*.rs' \ 1741 -o -path $(abs_srctree)/rust/alloc -prune \ 1742 -o -path $(abs_objtree)/rust/test -prune \ 1743 | grep -Fv $(abs_srctree)/rust/alloc \ 1744 | grep -Fv $(abs_objtree)/rust/test \ 1745 | grep -Fv generated \ 1746 | xargs $(RUSTFMT) $(rustfmt_flags) 1747 1748rustfmtcheck: rustfmt_flags = --check 1749rustfmtcheck: rustfmt 1750 1751# Misc 1752# --------------------------------------------------------------------------- 1753 1754PHONY += misc-check 1755misc-check: 1756 $(Q)$(srctree)/scripts/misc-check 1757 1758all: misc-check 1759 1760PHONY += scripts_gdb 1761scripts_gdb: prepare0 1762 $(Q)$(MAKE) $(build)=scripts/gdb 1763 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1764 1765ifdef CONFIG_GDB_SCRIPTS 1766all: scripts_gdb 1767endif 1768 1769else # KBUILD_EXTMOD 1770 1771filechk_kernel.release = echo $(KERNELRELEASE) 1772 1773### 1774# External module support. 1775# When building external modules the kernel used as basis is considered 1776# read-only, and no consistency checks are made and the make 1777# system is not used on the basis kernel. If updates are required 1778# in the basis kernel ordinary make commands (without M=...) must be used. 1779 1780# We are always building only modules. 1781KBUILD_BUILTIN := 1782KBUILD_MODULES := 1 1783 1784build-dir := $(KBUILD_EXTMOD) 1785 1786compile_commands.json: $(extmod_prefix)compile_commands.json 1787PHONY += compile_commands.json 1788 1789clean-dirs := $(KBUILD_EXTMOD) 1790clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1791 $(KBUILD_EXTMOD)/compile_commands.json 1792 1793PHONY += prepare 1794# now expand this into a simple variable to reduce the cost of shell evaluations 1795prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1796prepare: 1797 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1798 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1799 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1800 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1801 fi 1802 1803PHONY += help 1804help: 1805 @echo ' Building external modules.' 1806 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1807 @echo '' 1808 @echo ' modules - default target, build the module(s)' 1809 @echo ' modules_install - install the module' 1810 @echo ' clean - remove generated files in module directory only' 1811 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 1812 @echo '' 1813 1814ifndef CONFIG_MODULES 1815modules modules_install: __external_modules_error 1816__external_modules_error: 1817 @echo >&2 '***' 1818 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 1819 @echo >&2 '*** You cannot build or install external modules.' 1820 @echo >&2 '***' 1821 @false 1822endif 1823 1824endif # KBUILD_EXTMOD 1825 1826# --------------------------------------------------------------------------- 1827# Modules 1828 1829PHONY += modules modules_install modules_sign modules_prepare 1830 1831modules_install: 1832 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 1833 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 1834 1835ifeq ($(CONFIG_MODULE_SIG),y) 1836# modules_sign is a subset of modules_install. 1837# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1838modules_sign: modules_install 1839 @: 1840else 1841modules_sign: 1842 @echo >&2 '***' 1843 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 1844 @echo >&2 '***' 1845 @false 1846endif 1847 1848ifdef CONFIG_MODULES 1849 1850$(MODORDER): $(build-dir) 1851 @: 1852 1853# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1854# This is solely useful to speed up test compiles. 1855modules: modpost 1856ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1857 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1858endif 1859 1860PHONY += modules_check 1861modules_check: $(MODORDER) 1862 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1863 1864else # CONFIG_MODULES 1865 1866modules: 1867 @: 1868 1869KBUILD_MODULES := 1870 1871endif # CONFIG_MODULES 1872 1873PHONY += modpost 1874modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 1875 $(if $(KBUILD_MODULES), modules_check) 1876 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1877 1878# Single targets 1879# --------------------------------------------------------------------------- 1880# To build individual files in subdirectories, you can do like this: 1881# 1882# make foo/bar/baz.s 1883# 1884# The supported suffixes for single-target are listed in 'single-targets' 1885# 1886# To build only under specific subdirectories, you can do like this: 1887# 1888# make foo/bar/baz/ 1889 1890ifdef single-build 1891 1892# .ko is special because modpost is needed 1893single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1894single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 1895 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 1896 1897$(single-ko): single_modules 1898 @: 1899$(single-no-ko): $(build-dir) 1900 @: 1901 1902# Remove MODORDER when done because it is not the real one. 1903PHONY += single_modules 1904single_modules: $(single-no-ko) modules_prepare 1905 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER) 1906 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1907ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1908 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1909endif 1910 $(Q)rm -f $(MODORDER) 1911 1912single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 1913 1914KBUILD_MODULES := 1 1915 1916endif 1917 1918# Preset locale variables to speed up the build process. Limit locale 1919# tweaks to this spot to avoid wrong language settings when running 1920# make menuconfig etc. 1921# Error messages still appears in the original language 1922PHONY += $(build-dir) 1923$(build-dir): prepare 1924 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 1925 1926clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1927PHONY += $(clean-dirs) clean 1928$(clean-dirs): 1929 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1930 1931clean: $(clean-dirs) 1932 $(call cmd,rmfiles) 1933 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1934 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 1935 -o -name '*.ko.*' \ 1936 -o -name '*.dtb' -o -name '*.dtbo' \ 1937 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 1938 -o -name '*.dt.yaml' \ 1939 -o -name '*.dwo' -o -name '*.lst' \ 1940 -o -name '*.su' -o -name '*.mod' \ 1941 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1942 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1943 -o -name '*.asn1.[ch]' \ 1944 -o -name '*.symtypes' -o -name 'modules.order' \ 1945 -o -name '*.c.[012]*.*' \ 1946 -o -name '*.ll' \ 1947 -o -name '*.gcno' \ 1948 -o -name '*.*.symversions' \) -type f -print \ 1949 -o -name '.tmp_*' -print \ 1950 | xargs rm -rf 1951 1952# Generate tags for editors 1953# --------------------------------------------------------------------------- 1954quiet_cmd_tags = GEN $@ 1955 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1956 1957tags TAGS cscope gtags: FORCE 1958 $(call cmd,tags) 1959 1960# IDE support targets 1961PHONY += rust-analyzer 1962rust-analyzer: 1963 $(Q)$(MAKE) $(build)=rust $@ 1964 1965# Script to generate missing namespace dependencies 1966# --------------------------------------------------------------------------- 1967 1968PHONY += nsdeps 1969nsdeps: export KBUILD_NSDEPS=1 1970nsdeps: modules 1971 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1972 1973# Clang Tooling 1974# --------------------------------------------------------------------------- 1975 1976quiet_cmd_gen_compile_commands = GEN $@ 1977 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1978 1979$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1980 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 1981 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1982 $(call if_changed,gen_compile_commands) 1983 1984targets += $(extmod_prefix)compile_commands.json 1985 1986PHONY += clang-tidy clang-analyzer 1987 1988ifdef CONFIG_CC_IS_CLANG 1989quiet_cmd_clang_tools = CHECK $< 1990 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1991 1992clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 1993 $(call cmd,clang_tools) 1994else 1995clang-tidy clang-analyzer: 1996 @echo "$@ requires CC=clang" >&2 1997 @false 1998endif 1999 2000# Scripts to check various things for consistency 2001# --------------------------------------------------------------------------- 2002 2003PHONY += includecheck versioncheck coccicheck export_report 2004 2005includecheck: 2006 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2007 -name '*.[hcS]' -type f -print | sort \ 2008 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2009 2010versioncheck: 2011 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2012 -name '*.[hcS]' -type f -print | sort \ 2013 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2014 2015coccicheck: 2016 $(Q)$(BASH) $(srctree)/scripts/$@ 2017 2018export_report: 2019 $(PERL) $(srctree)/scripts/export_report.pl 2020 2021PHONY += checkstack kernelrelease kernelversion image_name 2022 2023# UML needs a little special treatment here. It wants to use the host 2024# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2025# else wants $(ARCH), including people doing cross-builds, which means 2026# that $(SUBARCH) doesn't work here. 2027ifeq ($(ARCH), um) 2028CHECKSTACK_ARCH := $(SUBARCH) 2029else 2030CHECKSTACK_ARCH := $(ARCH) 2031endif 2032checkstack: 2033 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2034 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 2035 2036kernelrelease: 2037 @$(filechk_kernel.release) 2038 2039kernelversion: 2040 @echo $(KERNELVERSION) 2041 2042image_name: 2043 @echo $(KBUILD_IMAGE) 2044 2045PHONY += run-command 2046run-command: 2047 $(Q)$(KBUILD_RUN_COMMAND) 2048 2049quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2050 cmd_rmfiles = rm -rf $(rm-files) 2051 2052# read saved command lines for existing targets 2053existing-targets := $(wildcard $(sort $(targets))) 2054 2055-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2056 2057endif # config-build 2058endif # mixed-build 2059endif # need-sub-make 2060 2061PHONY += FORCE 2062FORCE: 2063 2064# Declare the contents of the PHONY variable as phony. We keep that 2065# information in a variable so we can use it in if_changed and friends. 2066.PHONY: $(PHONY) 2067