1 # SPDX-License-Identifier: GPL-2.0 2 VERSION = 6 3 PATCHLEVEL = 11 4 SUBLEVEL = 0 5 EXTRAVERSION = -rc3 6 NAME = 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 14 ifeq ($(filter output-sync,$(.FEATURES)),) 15 $(error GNU Make >= 4.0 is required. Your Make version is $(MAKE_VERSION)) 16 endif 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 22 PHONY := __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 41 this-makefile := $(lastword $(MAKEFILE_LIST)) 42 abs_srctree := $(realpath $(dir $(this-makefile))) 43 abs_objtree := $(CURDIR) 44 45 ifneq ($(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) 49 MAKEFLAGS += -rR 50 51 # Avoid funny character set dependencies 52 unexport LC_ALL 53 LC_COLLATE=C 54 LC_NUMERIC=C 55 export LC_COLLATE LC_NUMERIC 56 57 # Avoid interference with shell env settings 58 unexport 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) $(build)=scripts/basic 75 # 76 # If KBUILD_VERBOSE contains 1, the whole command is echoed. 77 # If KBUILD_VERBOSE contains 2, the reason for rebuilding is printed. 78 # 79 # To put more focus on warnings, be less verbose as default 80 # Use 'make V=1' to see the full commands 81 82 ifeq ("$(origin V)", "command line") 83 KBUILD_VERBOSE = $(V) 84 endif 85 86 quiet = quiet_ 87 Q = @ 88 89 ifneq ($(findstring 1, $(KBUILD_VERBOSE)),) 90 quiet = 91 Q = 92 endif 93 94 # If the user is running make -s (silent mode), suppress echoing of 95 # commands 96 ifneq ($(findstring s,$(firstword -$(MAKEFLAGS))),) 97 quiet=silent_ 98 override KBUILD_VERBOSE := 99 endif 100 101 export 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. 112 113 ifeq ("$(origin C)", "command line") 114 KBUILD_CHECKSRC = $(C) 115 endif 116 ifndef KBUILD_CHECKSRC 117 KBUILD_CHECKSRC = 0 118 endif 119 120 export KBUILD_CHECKSRC 121 122 # Enable "clippy" (a linter) as part of the Rust compilation. 123 # 124 # Use 'make CLIPPY=1' to enable it. 125 ifeq ("$(origin CLIPPY)", "command line") 126 KBUILD_CLIPPY := $(CLIPPY) 127 endif 128 129 export KBUILD_CLIPPY 130 131 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 132 # directory of external module to build. Setting M= takes precedence. 133 ifeq ("$(origin M)", "command line") 134 KBUILD_EXTMOD := $(M) 135 endif 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 144 ifneq ($(filter %/, $(KBUILD_EXTMOD)),) 145 KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) 146 endif 147 148 export KBUILD_EXTMOD 149 150 # backward compatibility 151 KBUILD_EXTRA_WARN ?= $(KBUILD_ENABLE_EXTRA_GCC_CHECKS) 152 153 ifeq ("$(origin W)", "command line") 154 KBUILD_EXTRA_WARN := $(W) 155 endif 156 157 export KBUILD_EXTRA_WARN 158 159 # Kbuild will save output files in the current working directory. 160 # This does not need to match to the root of the kernel source tree. 161 # 162 # For example, you can do this: 163 # 164 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 165 # 166 # If you want to save output files in a different location, there are 167 # two syntaxes to specify it. 168 # 169 # 1) O= 170 # Use "make O=dir/to/store/output/files/" 171 # 172 # 2) Set KBUILD_OUTPUT 173 # Set the environment variable KBUILD_OUTPUT to point to the output directory. 174 # export KBUILD_OUTPUT=dir/to/store/output/files/; make 175 # 176 # The O= assignment takes precedence over the KBUILD_OUTPUT environment 177 # variable. 178 179 # Do we want to change the working directory? 180 ifeq ("$(origin O)", "command line") 181 KBUILD_OUTPUT := $(O) 182 endif 183 184 ifneq ($(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 188 abs_objtree := $(realpath $(KBUILD_OUTPUT)) 189 $(if $(abs_objtree),,$(error failed to create output directory "$(KBUILD_OUTPUT)")) 190 endif # ifneq ($(KBUILD_OUTPUT),) 191 192 ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 193 $(error source directory cannot contain spaces or colons) 194 endif 195 196 export sub_make_done := 1 197 198 endif # sub_make_done 199 200 ifeq ($(abs_objtree),$(CURDIR)) 201 # Suppress "Entering directory ..." if we are at the final work directory. 202 no-print-directory := --no-print-directory 203 else 204 # Recursion to show "Entering directory ..." 205 need-sub-make := 1 206 endif 207 208 ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),) 209 # If --no-print-directory is unset, recurse once again to set it. 210 # You may end up recursing into __sub-make twice. This is needed due to the 211 # behavior change in GNU Make 4.4.1. 212 need-sub-make := 1 213 endif 214 215 ifeq ($(need-sub-make),1) 216 217 PHONY += $(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 $(MAKECMDGOALS) 226 227 else # need-sub-make 228 229 # We process the rest of the Makefile if this is the final invocation of make 230 231 ifeq ($(abs_srctree),$(abs_objtree)) 232 # building in the source tree 233 srctree := . 234 building_out_of_srctree := 235 else 236 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 237 # building in a subdirectory of the source tree 238 srctree := .. 239 else 240 srctree := $(abs_srctree) 241 endif 242 building_out_of_srctree := 1 243 endif 244 245 ifneq ($(KBUILD_ABS_SRCTREE),) 246 srctree := $(abs_srctree) 247 endif 248 249 objtree := . 250 251 VPATH := 252 253 ifeq ($(KBUILD_EXTMOD),) 254 ifdef building_out_of_srctree 255 VPATH := $(srctree) 256 endif 257 endif 258 259 export 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). 268 269 version_h := include/generated/uapi/linux/version.h 270 271 clean-targets := %clean mrproper cleandocs 272 no-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 277 no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \ 278 image_name 279 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/ 280 281 config-build := 282 mixed-build := 283 need-config := 1 284 may-sync-config := 1 285 single-build := 286 287 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 288 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 289 need-config := 290 endif 291 endif 292 293 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 294 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 295 may-sync-config := 296 endif 297 endif 298 299 need-compiler := $(may-sync-config) 300 301 ifneq ($(KBUILD_EXTMOD),) 302 may-sync-config := 303 endif 304 305 ifeq ($(KBUILD_EXTMOD),) 306 ifneq ($(filter %config,$(MAKECMDGOALS)),) 307 config-build := 1 308 ifneq ($(words $(MAKECMDGOALS)),1) 309 mixed-build := 1 310 endif 311 endif 312 endif 313 314 # We cannot build single targets and the others at the same time 315 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 316 single-build := 1 317 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 318 mixed-build := 1 319 endif 320 endif 321 322 # For "make -j clean all", "make -j mrproper defconfig all", etc. 323 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 324 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 325 mixed-build := 1 326 endif 327 endif 328 329 # install and modules_install need also be processed one by one 330 ifneq ($(filter install,$(MAKECMDGOALS)),) 331 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 332 mixed-build := 1 333 endif 334 endif 335 336 ifdef mixed-build 337 # =========================================================================== 338 # We're called with mixed targets (*config and build targets). 339 # Handle them one by one. 340 341 PHONY += $(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 351 352 else # !mixed-build 353 354 include $(srctree)/scripts/Kbuild.include 355 356 # Read KERNELRELEASE from include/config/kernel.release (if it exists) 357 KERNELRELEASE = $(call read-file, include/config/kernel.release) 358 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 359 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 360 361 include $(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 381 ARCH ?= $(SUBARCH) 382 383 # Architecture as present in compile.h 384 UTS_MACHINE := $(ARCH) 385 SRCARCH := $(ARCH) 386 387 # Additional ARCH settings for x86 388 ifeq ($(ARCH),i386) 389 SRCARCH := x86 390 endif 391 ifeq ($(ARCH),x86_64) 392 SRCARCH := x86 393 endif 394 395 # Additional ARCH settings for sparc 396 ifeq ($(ARCH),sparc32) 397 SRCARCH := sparc 398 endif 399 ifeq ($(ARCH),sparc64) 400 SRCARCH := sparc 401 endif 402 403 # Additional ARCH settings for parisc 404 ifeq ($(ARCH),parisc64) 405 SRCARCH := parisc 406 endif 407 408 export cross_compiling := 409 ifneq ($(SRCARCH),$(SUBARCH)) 410 cross_compiling := 1 411 endif 412 413 KCONFIG_CONFIG ?= .config 414 export KCONFIG_CONFIG 415 416 # SHELL used by kbuild 417 CONFIG_SHELL := sh 418 419 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 420 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 421 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 422 423 ifneq ($(LLVM),) 424 ifneq ($(filter %/,$(LLVM)),) 425 LLVM_PREFIX := $(LLVM) 426 else ifneq ($(filter -%,$(LLVM)),) 427 LLVM_SUFFIX := $(LLVM) 428 endif 429 430 HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 431 HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 432 else 433 HOSTCC = gcc 434 HOSTCXX = g++ 435 endif 436 HOSTRUSTC = rustc 437 HOSTPKG_CONFIG = pkg-config 438 439 KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 440 -O2 -fomit-frame-pointer -std=gnu11 441 KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 442 KBUILD_USERLDFLAGS := $(USERLDFLAGS) 443 444 # These flags apply to all Rust code in the tree, including the kernel and 445 # host programs. 446 export 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 460 461 KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \ 462 $(HOSTCFLAGS) -I $(srctree)/scripts/include 463 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \ 464 -I $(srctree)/scripts/include 465 KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ 466 -Zallow-features= $(HOSTRUSTFLAGS) 467 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 468 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 469 470 # Make variables (CC, etc...) 471 CPP = $(CC) -E 472 ifneq ($(LLVM),) 473 CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 474 LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 475 AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 476 NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 477 OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 478 OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 479 READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 480 STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 481 else 482 CC = $(CROSS_COMPILE)gcc 483 LD = $(CROSS_COMPILE)ld 484 AR = $(CROSS_COMPILE)ar 485 NM = $(CROSS_COMPILE)nm 486 OBJCOPY = $(CROSS_COMPILE)objcopy 487 OBJDUMP = $(CROSS_COMPILE)objdump 488 READELF = $(CROSS_COMPILE)readelf 489 STRIP = $(CROSS_COMPILE)strip 490 endif 491 RUSTC = rustc 492 RUSTDOC = rustdoc 493 RUSTFMT = rustfmt 494 CLIPPY_DRIVER = clippy-driver 495 BINDGEN = bindgen 496 PAHOLE = pahole 497 RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 498 LEX = flex 499 YACC = bison 500 AWK = awk 501 INSTALLKERNEL := installkernel 502 PERL = perl 503 PYTHON3 = python3 504 CHECK = sparse 505 BASH = bash 506 KGZIP = gzip 507 KBZIP2 = bzip2 508 KLZOP = lzop 509 LZMA = lzma 510 LZ4 = lz4c 511 XZ = xz 512 ZSTD = zstd 513 514 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 515 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 516 NOSTDINC_FLAGS := 517 CFLAGS_MODULE = 518 RUSTFLAGS_MODULE = 519 AFLAGS_MODULE = 520 LDFLAGS_MODULE = 521 CFLAGS_KERNEL = 522 RUSTFLAGS_KERNEL = 523 AFLAGS_KERNEL = 524 LDFLAGS_vmlinux = 525 526 # Use USERINCLUDE when you must reference the UAPI directories only. 527 USERINCLUDE := \ 528 -I$(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 $(srctree)/include/linux/kconfig.h 534 535 # Use LINUXINCLUDE when you must reference the include/ directory. 536 # Needed to be compatible with the O= option 537 LINUXINCLUDE := \ 538 -I$(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) 543 544 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 545 546 KBUILD_CFLAGS := 547 KBUILD_CFLAGS += -std=gnu11 548 KBUILD_CFLAGS += -fshort-wchar 549 KBUILD_CFLAGS += -funsigned-char 550 KBUILD_CFLAGS += -fno-common 551 KBUILD_CFLAGS += -fno-PIE 552 KBUILD_CFLAGS += -fno-strict-aliasing 553 554 KBUILD_CPPFLAGS := -D__KERNEL__ 555 KBUILD_RUSTFLAGS := $(rust_common_flags) \ 556 -Cpanic=abort -Cembed-bitcode=n -Clto=n \ 557 -Cforce-unwind-tables=n -Ccodegen-units=1 \ 558 -Csymbol-mangling-version=v0 \ 559 -Crelocation-model=static \ 560 -Zfunction-sections=n \ 561 -Wclippy::float_arithmetic 562 563 KBUILD_AFLAGS_KERNEL := 564 KBUILD_CFLAGS_KERNEL := 565 KBUILD_RUSTFLAGS_KERNEL := 566 KBUILD_AFLAGS_MODULE := -DMODULE 567 KBUILD_CFLAGS_MODULE := -DMODULE 568 KBUILD_RUSTFLAGS_MODULE := --cfg MODULE 569 KBUILD_LDFLAGS_MODULE := 570 KBUILD_LDFLAGS := 571 CLANG_FLAGS := 572 573 ifeq ($(KBUILD_CLIPPY),1) 574 RUSTC_OR_CLIPPY_QUIET := CLIPPY 575 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) 576 else 577 RUSTC_OR_CLIPPY_QUIET := RUSTC 578 RUSTC_OR_CLIPPY = $(RUSTC) 579 endif 580 581 ifdef RUST_LIB_SRC 582 export RUST_LIB_SRC 583 endif 584 585 # Allows the usage of unstable features in stable compilers. 586 export RUSTC_BOOTSTRAP := 1 587 588 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 589 export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN 590 export HOSTRUSTC KBUILD_HOSTRUSTFLAGS 591 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 592 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 593 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 594 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 595 export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 596 597 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 598 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 599 export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE 600 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 601 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE 602 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL 603 604 # Files to ignore in find ... statements 605 606 export 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/ 614 PHONY += scripts_basic 615 scripts_basic: 616 $(Q)$(MAKE) $(build)=scripts/basic 617 618 PHONY += outputmakefile 619 ifdef 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 626 627 quiet_cmd_makefile = GEN Makefile 628 cmd_makefile = { \ 629 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 630 echo "include $(srctree)/Makefile"; \ 631 } > Makefile 632 633 outputmakefile: 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 $(Q)test -e .gitignore || \ 646 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 647 endif 648 649 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 650 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 651 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 652 # and from include/config/auto.conf.cmd to detect the compiler upgrade. 653 CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 654 655 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 656 include $(srctree)/scripts/Makefile.clang 657 endif 658 659 # Include this also for config targets because some architectures need 660 # cc-cross-prefix to determine CROSS_COMPILE. 661 ifdef need-compiler 662 include $(srctree)/scripts/Makefile.compiler 663 endif 664 665 ifdef config-build 666 # =========================================================================== 667 # *config targets only - make sure prerequisites are updated, and descend 668 # in scripts/kconfig to make the *config target 669 670 # Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed. 671 # KBUILD_DEFCONFIG may point out an alternative default configuration 672 # used for 'make defconfig' 673 include $(srctree)/arch/$(SRCARCH)/Makefile 674 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 675 676 config: outputmakefile scripts_basic FORCE 677 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 678 679 %config: outputmakefile scripts_basic FORCE 680 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 681 682 else #!config-build 683 # =========================================================================== 684 # Build targets only - this includes vmlinux, arch-specific targets, clean 685 # targets and others. In general all targets except *config targets. 686 687 # If building an external module we do not care about the all: rule 688 # but instead __all depend on modules 689 PHONY += all 690 ifeq ($(KBUILD_EXTMOD),) 691 __all: all 692 else 693 __all: modules 694 endif 695 696 targets := 697 698 # Decide whether to build built-in, modular, or both. 699 # Normally, just do built-in. 700 701 KBUILD_MODULES := 702 KBUILD_BUILTIN := 1 703 704 # If we have only "make modules", don't compile built-in objects. 705 ifeq ($(MAKECMDGOALS),modules) 706 KBUILD_BUILTIN := 707 endif 708 709 # If we have "make <whatever> modules", compile modules 710 # in addition to whatever we do anyway. 711 # Just "make" or "make all" shall build modules as well 712 713 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 714 KBUILD_MODULES := 1 715 endif 716 717 ifeq ($(MAKECMDGOALS),) 718 KBUILD_MODULES := 1 719 endif 720 721 export KBUILD_MODULES KBUILD_BUILTIN 722 723 ifdef need-config 724 include include/config/auto.conf 725 endif 726 727 ifeq ($(KBUILD_EXTMOD),) 728 # Objects we will link into vmlinux / subdirs we need to visit 729 core-y := 730 drivers-y := 731 libs-y := lib/ 732 endif # KBUILD_EXTMOD 733 734 # The all: target is the default when no target is given on the 735 # command line. 736 # This allow a user to issue only 'make' to build a kernel including modules 737 # Defaults to vmlinux, but the arch makefile usually adds further targets 738 all: vmlinux 739 740 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 741 ifdef CONFIG_CC_IS_GCC 742 CFLAGS_GCOV += -fno-tree-loop-im 743 endif 744 export CFLAGS_GCOV 745 746 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 747 ifdef CONFIG_FUNCTION_TRACER 748 CC_FLAGS_FTRACE := -pg 749 endif 750 751 include $(srctree)/arch/$(SRCARCH)/Makefile 752 753 ifdef need-config 754 ifdef may-sync-config 755 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if 756 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile 757 # because some architectures define CROSS_COMPILE there. 758 include include/config/auto.conf.cmd 759 760 $(KCONFIG_CONFIG): 761 @echo >&2 '***' 762 @echo >&2 '*** Configuration file "$@" not found!' 763 @echo >&2 '***' 764 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 765 @echo >&2 '*** "make menuconfig" or "make xconfig").' 766 @echo >&2 '***' 767 @/bin/false 768 769 # The actual configuration files used during the build are stored in 770 # include/generated/ and include/config/. Update them if .config is newer than 771 # include/config/auto.conf (which mirrors .config). 772 # 773 # This exploits the 'multi-target pattern rule' trick. 774 # The syncconfig should be executed only once to make all the targets. 775 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 776 # 777 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 778 # so you cannot notice that Kconfig is waiting for the user input. 779 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) 780 $(Q)$(kecho) " SYNC $@" 781 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 782 else # !may-sync-config 783 # External modules and some install targets need include/generated/autoconf.h 784 # and include/config/auto.conf but do not care if they are up-to-date. 785 # Use auto.conf to trigger the test 786 PHONY += include/config/auto.conf 787 788 include/config/auto.conf: 789 @test -e include/generated/autoconf.h -a -e $@ || ( \ 790 echo >&2; \ 791 echo >&2 " ERROR: Kernel configuration is invalid."; \ 792 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 793 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 794 echo >&2 ; \ 795 /bin/false) 796 797 endif # may-sync-config 798 endif # need-config 799 800 KBUILD_CFLAGS += -fno-delete-null-pointer-checks 801 802 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 803 KBUILD_CFLAGS += -O2 804 KBUILD_RUSTFLAGS += -Copt-level=2 805 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 806 KBUILD_CFLAGS += -Os 807 KBUILD_RUSTFLAGS += -Copt-level=s 808 endif 809 810 # Always set `debug-assertions` and `overflow-checks` because their default 811 # depends on `opt-level` and `debug-assertions`, respectively. 812 KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) 813 KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) 814 815 # Tell gcc to never replace conditional load with a non-conditional one 816 ifdef CONFIG_CC_IS_GCC 817 # gcc-10 renamed --param=allow-store-data-races=0 to 818 # -fno-allow-store-data-races. 819 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 820 KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 821 endif 822 823 ifdef CONFIG_READABLE_ASM 824 # Disable optimizations that make assembler listings hard to read. 825 # reorder blocks reorders the control in the function 826 # ipa clone creates specialized cloned functions 827 # partial inlining inlines only parts of functions 828 KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 829 endif 830 831 stackp-flags-y := -fno-stack-protector 832 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 833 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 834 835 KBUILD_CFLAGS += $(stackp-flags-y) 836 837 KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings 838 KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) 839 840 ifdef CONFIG_FRAME_POINTER 841 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 842 KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y 843 else 844 # Some targets (ARM with Thumb2, for example), can't be built with frame 845 # pointers. For those, we don't have FUNCTION_TRACER automatically 846 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 847 # incompatible with -fomit-frame-pointer with current GCC, so we don't use 848 # -fomit-frame-pointer with FUNCTION_TRACER. 849 # In the Rust target specification, "frame-pointer" is set explicitly 850 # to "may-omit". 851 ifndef CONFIG_FUNCTION_TRACER 852 KBUILD_CFLAGS += -fomit-frame-pointer 853 endif 854 endif 855 856 # Initialize all stack variables with a 0xAA pattern. 857 ifdef CONFIG_INIT_STACK_ALL_PATTERN 858 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 859 endif 860 861 # Initialize all stack variables with a zero value. 862 ifdef CONFIG_INIT_STACK_ALL_ZERO 863 KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 864 ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER 865 # https://github.com/llvm/llvm-project/issues/44842 866 CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 867 export CC_AUTO_VAR_INIT_ZERO_ENABLER 868 KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) 869 endif 870 endif 871 872 # While VLAs have been removed, GCC produces unreachable stack probes 873 # for the randomize_kstack_offset feature. Disable it for all compilers. 874 KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 875 876 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 877 ifdef CONFIG_ZERO_CALL_USED_REGS 878 KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 879 endif 880 881 ifdef CONFIG_FUNCTION_TRACER 882 ifdef CONFIG_FTRACE_MCOUNT_USE_CC 883 CC_FLAGS_FTRACE += -mrecord-mcount 884 ifdef CONFIG_HAVE_NOP_MCOUNT 885 ifeq ($(call cc-option-yn, -mnop-mcount),y) 886 CC_FLAGS_FTRACE += -mnop-mcount 887 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 888 endif 889 endif 890 endif 891 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 892 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT 893 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 894 endif 895 endif 896 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 897 ifdef CONFIG_HAVE_C_RECORDMCOUNT 898 BUILD_C_RECORDMCOUNT := y 899 export BUILD_C_RECORDMCOUNT 900 endif 901 endif 902 ifdef CONFIG_HAVE_FENTRY 903 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 904 ifeq ($(call cc-option-yn, -mfentry),y) 905 CC_FLAGS_FTRACE += -mfentry 906 CC_FLAGS_USING += -DCC_USING_FENTRY 907 endif 908 endif 909 export CC_FLAGS_FTRACE 910 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 911 KBUILD_AFLAGS += $(CC_FLAGS_USING) 912 endif 913 914 # We trigger additional mismatches with less inlining 915 ifdef CONFIG_DEBUG_SECTION_MISMATCH 916 KBUILD_CFLAGS += -fno-inline-functions-called-once 917 endif 918 919 # `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). 920 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 921 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 922 KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y 923 LDFLAGS_vmlinux += --gc-sections 924 endif 925 926 ifdef CONFIG_SHADOW_CALL_STACK 927 ifndef CONFIG_DYNAMIC_SCS 928 CC_FLAGS_SCS := -fsanitize=shadow-call-stack 929 KBUILD_CFLAGS += $(CC_FLAGS_SCS) 930 endif 931 export CC_FLAGS_SCS 932 endif 933 934 ifdef CONFIG_LTO_CLANG 935 ifdef CONFIG_LTO_CLANG_THIN 936 CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 937 else 938 CC_FLAGS_LTO := -flto 939 endif 940 CC_FLAGS_LTO += -fvisibility=hidden 941 942 # Limit inlining across translation units to reduce binary size 943 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 944 endif 945 946 ifdef CONFIG_LTO 947 KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 948 KBUILD_AFLAGS += -fno-lto 949 export CC_FLAGS_LTO 950 endif 951 952 ifdef CONFIG_CFI_CLANG 953 CC_FLAGS_CFI := -fsanitize=kcfi 954 KBUILD_CFLAGS += $(CC_FLAGS_CFI) 955 export CC_FLAGS_CFI 956 endif 957 958 # Architectures can define flags to add/remove for floating-point support 959 CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT 960 export CC_FLAGS_FPU 961 export CC_FLAGS_NO_FPU 962 963 ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) 964 # Set the minimal function alignment. Use the newer GCC option 965 # -fmin-function-alignment if it is available, or fall back to -falign-funtions. 966 # See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. 967 ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT 968 KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) 969 else 970 KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) 971 endif 972 endif 973 974 # arch Makefile may override CC so keep this after arch Makefile is included 975 NOSTDINC_FLAGS += -nostdinc 976 977 # To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, 978 # the kernel uses only C99 flexible arrays for dynamically sized trailing 979 # arrays. Enforce this for everything that may examine structure sizes and 980 # perform bounds checking. 981 KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) 982 983 #Currently, disable -Wstringop-overflow for GCC 11, globally. 984 KBUILD_CFLAGS-$(CONFIG_CC_NO_STRINGOP_OVERFLOW) += $(call cc-option, -Wno-stringop-overflow) 985 KBUILD_CFLAGS-$(CONFIG_CC_STRINGOP_OVERFLOW) += $(call cc-option, -Wstringop-overflow) 986 987 # disable invalid "can't wrap" optimizations for signed / pointers 988 KBUILD_CFLAGS += -fno-strict-overflow 989 990 # Make sure -fstack-check isn't enabled (like gentoo apparently did) 991 KBUILD_CFLAGS += -fno-stack-check 992 993 # conserve stack if available 994 ifdef CONFIG_CC_IS_GCC 995 KBUILD_CFLAGS += -fconserve-stack 996 endif 997 998 # change __FILE__ to the relative path from the srctree 999 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1000 1001 # include additional Makefiles when needed 1002 include-y := scripts/Makefile.extrawarn 1003 include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1004 include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 1005 include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1006 include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1007 include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan 1008 include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1009 include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1010 include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1011 include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1012 1013 include $(addprefix $(srctree)/, $(include-y)) 1014 1015 # scripts/Makefile.gcc-plugins is intentionally included last. 1016 # Do not add $(call cc-option,...) below this line. When you build the kernel 1017 # from the clean source tree, the GCC plugins do not exist at this point. 1018 1019 # Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments 1020 KBUILD_CPPFLAGS += $(KCPPFLAGS) 1021 KBUILD_AFLAGS += $(KAFLAGS) 1022 KBUILD_CFLAGS += $(KCFLAGS) 1023 KBUILD_RUSTFLAGS += $(KRUSTFLAGS) 1024 1025 KBUILD_LDFLAGS_MODULE += --build-id=sha1 1026 LDFLAGS_vmlinux += --build-id=sha1 1027 1028 KBUILD_LDFLAGS += -z noexecstack 1029 ifeq ($(CONFIG_LD_IS_BFD),y) 1030 KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1031 endif 1032 1033 ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1034 LDFLAGS_vmlinux += -X 1035 endif 1036 1037 ifeq ($(CONFIG_RELR),y) 1038 # ld.lld before 15 did not support -z pack-relative-relocs. 1039 LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) 1040 endif 1041 1042 # We never want expected sections to be placed heuristically by the 1043 # linker. All sections should be explicitly named in the linker script. 1044 ifdef CONFIG_LD_ORPHAN_WARN 1045 LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) 1046 endif 1047 1048 # Align the bit size of userspace programs with the kernel 1049 KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1050 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1051 1052 # make the checker run with the right architecture 1053 CHECKFLAGS += --arch=$(ARCH) 1054 1055 # insure the checker run with the right endianness 1056 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1057 1058 # the checker needs the correct machine size 1059 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1060 1061 # Default kernel image to build when no specific target is given. 1062 # KBUILD_IMAGE may be overruled on the command line or 1063 # set in the environment 1064 # Also any assignments in arch/$(ARCH)/Makefile take precedence over 1065 # this default value 1066 export KBUILD_IMAGE ?= vmlinux 1067 1068 # 1069 # INSTALL_PATH specifies where to place the updated kernel and system map 1070 # images. Default is /boot, but you can set it to other values 1071 export INSTALL_PATH ?= /boot 1072 1073 # 1074 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1075 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1076 # an argument if needed. Otherwise it defaults to the kernel install path 1077 # 1078 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1079 1080 # 1081 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1082 # relocations required by build roots. This is not defined in the 1083 # makefile but the argument can be passed to make if needed. 1084 # 1085 1086 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1087 export MODLIB 1088 1089 PHONY += prepare0 1090 1091 export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1092 export MODORDER := $(extmod_prefix)modules.order 1093 export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1094 1095 ifeq ($(KBUILD_EXTMOD),) 1096 1097 build-dir := . 1098 clean-dirs := $(sort . Documentation \ 1099 $(patsubst %/,%,$(filter %/, $(core-) \ 1100 $(drivers-) $(libs-)))) 1101 1102 export ARCH_CORE := $(core-y) 1103 export ARCH_LIB := $(filter %/, $(libs-y)) 1104 export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1105 # Externally visible symbols (used by link-vmlinux.sh) 1106 1107 KBUILD_VMLINUX_OBJS := ./built-in.a 1108 ifdef CONFIG_MODULES 1109 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1110 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1111 else 1112 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1113 endif 1114 1115 export KBUILD_VMLINUX_LIBS 1116 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1117 1118 ifdef CONFIG_TRIM_UNUSED_KSYMS 1119 # For the kernel to actually contain only the needed exported symbols, 1120 # we have to build modules as well to determine what those symbols are. 1121 KBUILD_MODULES := 1 1122 endif 1123 1124 # '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1125 quiet_cmd_ar_vmlinux.a = AR $@ 1126 cmd_ar_vmlinux.a = \ 1127 rm -f $@; \ 1128 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1129 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) 1130 1131 targets += vmlinux.a 1132 vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE 1133 $(call if_changed,ar_vmlinux.a) 1134 1135 PHONY += vmlinux_o 1136 vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) 1137 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1138 1139 vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o 1140 @: 1141 1142 PHONY += vmlinux 1143 # LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, 1144 # not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is 1145 # unrelated; the decompressors just happen to have the same base name, 1146 # arch/*/boot/compressed/vmlinux. 1147 # Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. 1148 # 1149 # _LDFLAGS_vmlinux is a workaround for the 'private export' bug: 1150 # https://savannah.gnu.org/bugs/?61463 1151 # For Make > 4.4, the following simple code will work: 1152 # vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1153 vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) 1154 vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) 1155 vmlinux: vmlinux.o $(KBUILD_LDS) modpost 1156 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux 1157 1158 # The actual objects are generated when descending, 1159 # make sure no implicit rule kicks in 1160 $(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1161 1162 ifeq ($(origin KERNELRELEASE),file) 1163 filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) 1164 else 1165 filechk_kernel.release = echo $(KERNELRELEASE) 1166 endif 1167 1168 # Store (new) KERNELRELEASE string in include/config/kernel.release 1169 include/config/kernel.release: FORCE 1170 $(call filechk,kernel.release) 1171 1172 # Additional helpers built in scripts/ 1173 # Carefully list dependencies so we do not try to build scripts twice 1174 # in parallel 1175 PHONY += scripts 1176 scripts: scripts_basic scripts_dtc 1177 $(Q)$(MAKE) $(build)=$(@) 1178 1179 # Things we need to do before we recursively start building the kernel 1180 # or the modules are listed in "prepare". 1181 # A multi level approach is used. prepareN is processed before prepareN-1. 1182 # archprepare is used in arch Makefiles and when processed asm symlink, 1183 # version.h and scripts_basic is processed / created. 1184 1185 PHONY += prepare archprepare 1186 1187 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1188 asm-generic $(version_h) include/generated/utsrelease.h \ 1189 include/generated/compile.h include/generated/autoconf.h remove-stale-files 1190 1191 prepare0: archprepare 1192 $(Q)$(MAKE) $(build)=scripts/mod 1193 $(Q)$(MAKE) $(build)=. prepare 1194 1195 # All the preparing.. 1196 prepare: prepare0 1197 ifdef CONFIG_RUST 1198 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1199 $(Q)$(MAKE) $(build)=rust 1200 endif 1201 1202 PHONY += remove-stale-files 1203 remove-stale-files: 1204 $(Q)$(srctree)/scripts/remove-stale-files 1205 1206 # Support for using generic headers in asm-generic 1207 asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj 1208 1209 PHONY += asm-generic uapi-asm-generic 1210 asm-generic: uapi-asm-generic 1211 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1212 generic=include/asm-generic 1213 uapi-asm-generic: 1214 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1215 generic=include/uapi/asm-generic 1216 1217 # Generate some files 1218 # --------------------------------------------------------------------------- 1219 1220 # KERNELRELEASE can change from a few different places, meaning version.h 1221 # needs to be updated, so this check is forced on all builds 1222 1223 uts_len := 64 1224 define filechk_utsrelease.h 1225 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1226 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1227 exit 1; \ 1228 fi; \ 1229 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1230 endef 1231 1232 define filechk_version.h 1233 if [ $(SUBLEVEL) -gt 255 ]; then \ 1234 echo \#define LINUX_VERSION_CODE $(shell \ 1235 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1236 else \ 1237 echo \#define LINUX_VERSION_CODE $(shell \ 1238 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1239 fi; \ 1240 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1241 ((c) > 255 ? 255 : (c)))'; \ 1242 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1243 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1244 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1245 endef 1246 1247 $(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1248 $(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0) 1249 $(version_h): FORCE 1250 $(call filechk,version.h) 1251 1252 include/generated/utsrelease.h: include/config/kernel.release FORCE 1253 $(call filechk,utsrelease.h) 1254 1255 filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1256 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1257 1258 include/generated/compile.h: FORCE 1259 $(call filechk,compile.h) 1260 1261 PHONY += headerdep 1262 headerdep: 1263 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1264 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1265 1266 # --------------------------------------------------------------------------- 1267 # Kernel headers 1268 1269 #Default location for installed headers 1270 export INSTALL_HDR_PATH = $(objtree)/usr 1271 1272 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1273 cmd_headers_install = \ 1274 mkdir -p $(INSTALL_HDR_PATH); \ 1275 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1276 usr/include $(INSTALL_HDR_PATH) 1277 1278 PHONY += headers_install 1279 headers_install: headers 1280 $(call cmd,headers_install) 1281 1282 PHONY += archheaders archscripts 1283 1284 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1285 1286 PHONY += headers 1287 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1288 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML)) 1289 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1290 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1291 1292 ifdef CONFIG_HEADERS_INSTALL 1293 prepare: headers 1294 endif 1295 1296 PHONY += scripts_unifdef 1297 scripts_unifdef: scripts_basic 1298 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1299 1300 # --------------------------------------------------------------------------- 1301 # Install 1302 1303 # Many distributions have the custom install script, /sbin/installkernel. 1304 # If DKMS is installed, 'make install' will eventually recurse back 1305 # to this Makefile to build and install external modules. 1306 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1307 1308 quiet_cmd_install = INSTALL $(INSTALL_PATH) 1309 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1310 1311 # --------------------------------------------------------------------------- 1312 # vDSO install 1313 1314 PHONY += vdso_install 1315 vdso_install: export INSTALL_FILES = $(vdso-install-y) 1316 vdso_install: 1317 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst 1318 1319 # --------------------------------------------------------------------------- 1320 # Tools 1321 1322 ifdef CONFIG_OBJTOOL 1323 prepare: tools/objtool 1324 endif 1325 1326 ifdef CONFIG_BPF 1327 ifdef CONFIG_DEBUG_INFO_BTF 1328 prepare: tools/bpf/resolve_btfids 1329 endif 1330 endif 1331 1332 # The tools build system is not a part of Kbuild and tends to introduce 1333 # its own unique issues. If you need to integrate a new tool into Kbuild, 1334 # please consider locating that tool outside the tools/ tree and using the 1335 # standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry 1336 # here. See Documentation/kbuild/makefiles.rst for details. 1337 1338 PHONY += resolve_btfids_clean 1339 1340 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1341 1342 # tools/bpf/resolve_btfids directory might not exist 1343 # in output directory, skip its clean in that case 1344 resolve_btfids_clean: 1345 ifneq ($(wildcard $(resolve_btfids_O)),) 1346 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1347 endif 1348 1349 # Clear a bunch of variables before executing the submake 1350 ifeq ($(quiet),silent_) 1351 tools_silent=s 1352 endif 1353 1354 tools/: FORCE 1355 $(Q)mkdir -p $(objtree)/tools 1356 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1357 1358 tools/%: FORCE 1359 $(Q)mkdir -p $(objtree)/tools 1360 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1361 1362 # --------------------------------------------------------------------------- 1363 # Kernel selftest 1364 1365 PHONY += kselftest 1366 kselftest: headers 1367 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1368 1369 kselftest-%: headers FORCE 1370 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1371 1372 PHONY += kselftest-merge 1373 kselftest-merge: 1374 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1375 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ 1376 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config 1377 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1378 1379 # --------------------------------------------------------------------------- 1380 # Devicetree files 1381 1382 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1383 dtstree := arch/$(SRCARCH)/boot/dts 1384 endif 1385 1386 ifneq ($(dtstree),) 1387 1388 %.dtb: dtbs_prepare 1389 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1390 1391 %.dtbo: dtbs_prepare 1392 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1393 1394 PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1395 dtbs: dtbs_prepare 1396 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1 1397 1398 # include/config/kernel.release is actually needed when installing DTBs because 1399 # INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1400 # dtbs_install depend on it as dtbs_install may run as root. 1401 dtbs_prepare: include/config/kernel.release scripts_dtc 1402 1403 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1404 export CHECK_DTBS=y 1405 endif 1406 1407 ifneq ($(CHECK_DTBS),) 1408 dtbs_prepare: dt_binding_schemas 1409 endif 1410 1411 dtbs_check: dtbs 1412 1413 dtbs_install: 1414 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) 1415 1416 ifdef CONFIG_OF_EARLY_FLATTREE 1417 all: dtbs 1418 endif 1419 1420 endif 1421 1422 PHONY += scripts_dtc 1423 scripts_dtc: scripts_basic 1424 $(Q)$(MAKE) $(build)=scripts/dtc 1425 1426 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1427 export CHECK_DTBS=y 1428 endif 1429 1430 PHONY += dt_binding_check dt_binding_schemas 1431 dt_binding_check: dt_binding_schemas scripts_dtc 1432 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1433 1434 dt_binding_schemas: 1435 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1436 1437 PHONY += dt_compatible_check 1438 dt_compatible_check: dt_binding_schemas 1439 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ 1440 1441 # --------------------------------------------------------------------------- 1442 # Modules 1443 1444 ifdef CONFIG_MODULES 1445 1446 # By default, build modules as well 1447 1448 all: modules 1449 1450 # When we're building modules with modversions, we need to consider 1451 # the built-in objects during the descend as well, in order to 1452 # make sure the checksums are up to date before we record them. 1453 ifdef CONFIG_MODVERSIONS 1454 KBUILD_BUILTIN := 1 1455 endif 1456 1457 # Build modules 1458 # 1459 1460 # *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES 1461 # is an exception. 1462 ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1463 KBUILD_BUILTIN := 1 1464 modules: vmlinux 1465 endif 1466 1467 modules: modules_prepare 1468 1469 # Target to prepare building external modules 1470 modules_prepare: prepare 1471 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1472 1473 endif # CONFIG_MODULES 1474 1475 ### 1476 # Cleaning is done on three levels. 1477 # make clean Delete most generated files 1478 # Leave enough to build external modules 1479 # make mrproper Delete the current configuration, and all generated files 1480 # make distclean Remove editor backup files, patch leftover files and the like 1481 1482 # Directories & files removed with 'make clean' 1483 CLEAN_FILES += vmlinux.symvers modules-only.symvers \ 1484 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1485 compile_commands.json rust/test \ 1486 rust-project.json .vmlinux.objs .vmlinux.export.c 1487 1488 # Directories & files removed with 'make mrproper' 1489 MRPROPER_FILES += include/config include/generated \ 1490 arch/$(SRCARCH)/include/generated .objdiff \ 1491 debian snap tar-install PKGBUILD pacman \ 1492 .config .config.old .version \ 1493 Module.symvers \ 1494 certs/signing_key.pem \ 1495 certs/x509.genkey \ 1496 vmlinux-gdb.py \ 1497 rpmbuild \ 1498 rust/libmacros.so 1499 1500 # clean - Delete most, but leave enough to build external modules 1501 # 1502 clean: private rm-files := $(CLEAN_FILES) 1503 1504 PHONY += archclean vmlinuxclean 1505 1506 vmlinuxclean: 1507 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1508 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1509 1510 clean: archclean vmlinuxclean resolve_btfids_clean 1511 1512 # mrproper - Delete all generated files, including .config 1513 # 1514 mrproper: private rm-files := $(MRPROPER_FILES) 1515 mrproper-dirs := $(addprefix _mrproper_,scripts) 1516 1517 PHONY += $(mrproper-dirs) mrproper 1518 $(mrproper-dirs): 1519 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1520 1521 mrproper: clean $(mrproper-dirs) 1522 $(call cmd,rmfiles) 1523 @find . $(RCS_FIND_IGNORE) \ 1524 \( -name '*.rmeta' \) \ 1525 -type f -print | xargs rm -f 1526 1527 # distclean 1528 # 1529 PHONY += distclean 1530 1531 distclean: mrproper 1532 @find . $(RCS_FIND_IGNORE) \ 1533 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1534 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1535 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1536 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1537 -type f -print | xargs rm -f 1538 1539 1540 # Packaging of the kernel to various formats 1541 # --------------------------------------------------------------------------- 1542 1543 %src-pkg: FORCE 1544 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1545 %pkg: include/config/kernel.release FORCE 1546 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1547 1548 # Brief documentation of the typical targets used 1549 # --------------------------------------------------------------------------- 1550 1551 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1552 boards := $(sort $(notdir $(boards))) 1553 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1554 board-dirs := $(sort $(notdir $(board-dirs:/=))) 1555 1556 PHONY += help 1557 help: 1558 @echo 'Cleaning targets:' 1559 @echo ' clean - Remove most generated files but keep the config and' 1560 @echo ' enough build support to build external modules' 1561 @echo ' mrproper - Remove all generated files + config + various backup files' 1562 @echo ' distclean - mrproper + remove editor backup and patch files' 1563 @echo '' 1564 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1565 @echo '' 1566 @echo 'Other generic targets:' 1567 @echo ' all - Build all targets marked with [*]' 1568 @echo '* vmlinux - Build the bare kernel' 1569 @echo '* modules - Build all modules' 1570 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1571 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)' 1572 @echo ' dir/ - Build all files in dir and below' 1573 @echo ' dir/file.[ois] - Build specified target only' 1574 @echo ' dir/file.ll - Build the LLVM assembly file' 1575 @echo ' (requires compiler support for LLVM assembly generation)' 1576 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1577 @echo ' (requires a recent binutils and recent build (System.map))' 1578 @echo ' dir/file.ko - Build module including final link' 1579 @echo ' modules_prepare - Set up for building external modules' 1580 @echo ' tags/TAGS - Generate tags file for editors' 1581 @echo ' cscope - Generate cscope index' 1582 @echo ' gtags - Generate GNU GLOBAL index' 1583 @echo ' kernelrelease - Output the release version string (use with make -s)' 1584 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1585 @echo ' image_name - Output the image name (use with make -s)' 1586 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1587 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1588 echo '' 1589 @echo 'Static analysers:' 1590 @echo ' checkstack - Generate a list of stack hogs and consider all functions' 1591 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' 1592 @echo ' versioncheck - Sanity check on version.h usage' 1593 @echo ' includecheck - Check for duplicate included header files' 1594 @echo ' export_report - List the usages of all exported symbols' 1595 @echo ' headerdep - Detect inclusion cycles in headers' 1596 @echo ' coccicheck - Check with Coccinelle' 1597 @echo ' clang-analyzer - Check with clang static analyzer' 1598 @echo ' clang-tidy - Check with clang-tidy' 1599 @echo '' 1600 @echo 'Tools:' 1601 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1602 @echo '' 1603 @echo 'Kernel selftest:' 1604 @echo ' kselftest - Build and run kernel selftest' 1605 @echo ' Build, install, and boot kernel before' 1606 @echo ' running kselftest on it' 1607 @echo ' Run as root for full coverage' 1608 @echo ' kselftest-all - Build kernel selftest' 1609 @echo ' kselftest-install - Build and install kernel selftest' 1610 @echo ' kselftest-clean - Remove all generated kselftest files' 1611 @echo ' kselftest-merge - Merge all the config dependencies of' 1612 @echo ' kselftest to existing .config.' 1613 @echo '' 1614 @echo 'Rust targets:' 1615 @echo ' rustavailable - Checks whether the Rust toolchain is' 1616 @echo ' available and, if not, explains why.' 1617 @echo ' rustfmt - Reformat all the Rust code in the kernel' 1618 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' 1619 @echo ' is formatted, printing a diff otherwise.' 1620 @echo ' rustdoc - Generate Rust documentation' 1621 @echo ' (requires kernel .config)' 1622 @echo ' rusttest - Runs the Rust tests' 1623 @echo ' (requires kernel .config; downloads external repos)' 1624 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' 1625 @echo ' (requires kernel .config)' 1626 @echo ' dir/file.[os] - Build specified target only' 1627 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' 1628 @echo ' Run with RUSTFMT=n to skip reformatting if needed.' 1629 @echo ' The output is not intended to be compilable.' 1630 @echo ' dir/file.ll - Build the LLVM assembly file' 1631 @echo '' 1632 @$(if $(dtstree), \ 1633 echo 'Devicetree:'; \ 1634 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1635 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1636 echo ' dt_binding_check - Validate device tree binding documents and examples'; \ 1637 echo ' dt_binding_schema - Build processed device tree binding schemas'; \ 1638 echo ' dtbs_check - Validate device tree source files';\ 1639 echo '') 1640 1641 @echo 'Userspace tools targets:' 1642 @echo ' use "make tools/help"' 1643 @echo ' or "cd tools; make help"' 1644 @echo '' 1645 @echo 'Kernel packaging:' 1646 @$(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,c,e 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 ' c: extra checks in the configuration stage (Kconfig)' 1678 @echo ' e: warnings are being treated as errors' 1679 @echo ' Multiple levels can be combined with W=12 or W=123' 1680 @$(if $(dtstree), \ 1681 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ 1682 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ 1683 ) 1684 @echo '' 1685 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1686 @echo 'For further info see the ./README file' 1687 1688 1689 help-board-dirs := $(addprefix help-,$(board-dirs)) 1690 1691 help-boards: $(help-board-dirs) 1692 1693 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1694 1695 $(help-board-dirs): help-%: 1696 @echo 'Architecture-specific targets ($(SRCARCH) $*):' 1697 @$(if $(boards-per-dir), \ 1698 $(foreach b, $(boards-per-dir), \ 1699 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1700 echo '') 1701 1702 1703 # Documentation targets 1704 # --------------------------------------------------------------------------- 1705 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1706 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs 1707 PHONY += $(DOC_TARGETS) 1708 $(DOC_TARGETS): 1709 $(Q)$(MAKE) $(build)=Documentation $@ 1710 1711 1712 # Rust targets 1713 # --------------------------------------------------------------------------- 1714 1715 # "Is Rust available?" target 1716 PHONY += rustavailable 1717 rustavailable: 1718 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" 1719 1720 # Documentation target 1721 # 1722 # Using the singular to avoid running afoul of `no-dot-config-targets`. 1723 PHONY += rustdoc 1724 rustdoc: prepare 1725 $(Q)$(MAKE) $(build)=rust $@ 1726 1727 # Testing target 1728 PHONY += rusttest 1729 rusttest: prepare 1730 $(Q)$(MAKE) $(build)=rust $@ 1731 1732 # Formatting targets 1733 PHONY += rustfmt rustfmtcheck 1734 1735 # We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream. 1736 # 1737 # We match using absolute paths since `find` does not resolve them 1738 # when matching, which is a problem when e.g. `srctree` is `..`. 1739 # We `grep` afterwards in order to remove the directory entry itself. 1740 rustfmt: 1741 $(Q)find $(abs_srctree) -type f -name '*.rs' \ 1742 -o -path $(abs_srctree)/rust/alloc -prune \ 1743 -o -path $(abs_objtree)/rust/test -prune \ 1744 | grep -Fv $(abs_srctree)/rust/alloc \ 1745 | grep -Fv $(abs_objtree)/rust/test \ 1746 | grep -Fv generated \ 1747 | xargs $(RUSTFMT) $(rustfmt_flags) 1748 1749 rustfmtcheck: rustfmt_flags = --check 1750 rustfmtcheck: rustfmt 1751 1752 # Misc 1753 # --------------------------------------------------------------------------- 1754 1755 PHONY += misc-check 1756 misc-check: 1757 $(Q)$(srctree)/scripts/misc-check 1758 1759 all: misc-check 1760 1761 PHONY += scripts_gdb 1762 scripts_gdb: prepare0 1763 $(Q)$(MAKE) $(build)=scripts/gdb 1764 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1765 1766 ifdef CONFIG_GDB_SCRIPTS 1767 all: scripts_gdb 1768 endif 1769 1770 else # KBUILD_EXTMOD 1771 1772 filechk_kernel.release = echo $(KERNELRELEASE) 1773 1774 ### 1775 # External module support. 1776 # When building external modules the kernel used as basis is considered 1777 # read-only, and no consistency checks are made and the make 1778 # system is not used on the basis kernel. If updates are required 1779 # in the basis kernel ordinary make commands (without M=...) must be used. 1780 1781 # We are always building only modules. 1782 KBUILD_BUILTIN := 1783 KBUILD_MODULES := 1 1784 1785 build-dir := $(KBUILD_EXTMOD) 1786 1787 compile_commands.json: $(extmod_prefix)compile_commands.json 1788 PHONY += compile_commands.json 1789 1790 clean-dirs := $(KBUILD_EXTMOD) 1791 clean: private rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1792 $(KBUILD_EXTMOD)/compile_commands.json 1793 1794 PHONY += prepare 1795 # now expand this into a simple variable to reduce the cost of shell evaluations 1796 prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1797 prepare: 1798 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1799 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1800 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1801 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1802 fi 1803 1804 PHONY += help 1805 help: 1806 @echo ' Building external modules.' 1807 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1808 @echo '' 1809 @echo ' modules - default target, build the module(s)' 1810 @echo ' modules_install - install the module' 1811 @echo ' clean - remove generated files in module directory only' 1812 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file' 1813 @echo '' 1814 1815 ifndef CONFIG_MODULES 1816 modules modules_install: __external_modules_error 1817 __external_modules_error: 1818 @echo >&2 '***' 1819 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' 1820 @echo >&2 '*** You cannot build or install external modules.' 1821 @echo >&2 '***' 1822 @false 1823 endif 1824 1825 endif # KBUILD_EXTMOD 1826 1827 # --------------------------------------------------------------------------- 1828 # Modules 1829 1830 PHONY += modules modules_install modules_sign modules_prepare 1831 1832 modules_install: 1833 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ 1834 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) 1835 1836 ifeq ($(CONFIG_MODULE_SIG),y) 1837 # modules_sign is a subset of modules_install. 1838 # 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1839 modules_sign: modules_install 1840 @: 1841 else 1842 modules_sign: 1843 @echo >&2 '***' 1844 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' 1845 @echo >&2 '***' 1846 @false 1847 endif 1848 1849 ifdef CONFIG_MODULES 1850 1851 $(MODORDER): $(build-dir) 1852 @: 1853 1854 # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1855 # This is solely useful to speed up test compiles. 1856 modules: modpost 1857 ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1858 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1859 endif 1860 1861 PHONY += modules_check 1862 modules_check: $(MODORDER) 1863 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1864 1865 else # CONFIG_MODULES 1866 1867 modules: 1868 @: 1869 1870 KBUILD_MODULES := 1871 1872 endif # CONFIG_MODULES 1873 1874 PHONY += modpost 1875 modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 1876 $(if $(KBUILD_MODULES), modules_check) 1877 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1878 1879 # Single targets 1880 # --------------------------------------------------------------------------- 1881 # To build individual files in subdirectories, you can do like this: 1882 # 1883 # make foo/bar/baz.s 1884 # 1885 # The supported suffixes for single-target are listed in 'single-targets' 1886 # 1887 # To build only under specific subdirectories, you can do like this: 1888 # 1889 # make foo/bar/baz/ 1890 1891 ifdef single-build 1892 1893 # .ko is special because modpost is needed 1894 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1895 single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 1896 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 1897 1898 $(single-ko): single_modules 1899 @: 1900 $(single-no-ko): $(build-dir) 1901 @: 1902 1903 # Remove MODORDER when done because it is not the real one. 1904 PHONY += single_modules 1905 single_modules: $(single-no-ko) modules_prepare 1906 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER) 1907 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1908 ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1909 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1910 endif 1911 $(Q)rm -f $(MODORDER) 1912 1913 single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 1914 1915 KBUILD_MODULES := 1 1916 1917 endif 1918 1919 # Preset locale variables to speed up the build process. Limit locale 1920 # tweaks to this spot to avoid wrong language settings when running 1921 # make menuconfig etc. 1922 # Error messages still appears in the original language 1923 PHONY += $(build-dir) 1924 $(build-dir): prepare 1925 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 1926 1927 clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1928 PHONY += $(clean-dirs) clean 1929 $(clean-dirs): 1930 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1931 1932 clean: $(clean-dirs) 1933 $(call cmd,rmfiles) 1934 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1935 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ 1936 -o -name '*.ko.*' \ 1937 -o -name '*.dtb' -o -name '*.dtbo' \ 1938 -o -name '*.dtb.S' -o -name '*.dtbo.S' \ 1939 -o -name '*.dt.yaml' -o -name 'dtbs-list' \ 1940 -o -name '*.dwo' -o -name '*.lst' \ 1941 -o -name '*.su' -o -name '*.mod' \ 1942 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1943 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1944 -o -name '*.asn1.[ch]' \ 1945 -o -name '*.symtypes' -o -name 'modules.order' \ 1946 -o -name '*.c.[012]*.*' \ 1947 -o -name '*.ll' \ 1948 -o -name '*.gcno' \ 1949 -o -name '*.*.symversions' \) -type f -print \ 1950 -o -name '.tmp_*' -print \ 1951 | xargs rm -rf 1952 1953 # Generate tags for editors 1954 # --------------------------------------------------------------------------- 1955 quiet_cmd_tags = GEN $@ 1956 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1957 1958 tags TAGS cscope gtags: FORCE 1959 $(call cmd,tags) 1960 1961 # Generate rust-project.json (a file that describes the structure of non-Cargo 1962 # Rust projects) for rust-analyzer (an implementation of the Language Server 1963 # Protocol). 1964 PHONY += rust-analyzer 1965 rust-analyzer: 1966 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh 1967 $(Q)$(MAKE) $(build)=rust $@ 1968 1969 # Script to generate missing namespace dependencies 1970 # --------------------------------------------------------------------------- 1971 1972 PHONY += nsdeps 1973 nsdeps: export KBUILD_NSDEPS=1 1974 nsdeps: modules 1975 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1976 1977 # Clang Tooling 1978 # --------------------------------------------------------------------------- 1979 1980 quiet_cmd_gen_compile_commands = GEN $@ 1981 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1982 1983 $(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1984 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 1985 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1986 $(call if_changed,gen_compile_commands) 1987 1988 targets += $(extmod_prefix)compile_commands.json 1989 1990 PHONY += clang-tidy clang-analyzer 1991 1992 ifdef CONFIG_CC_IS_CLANG 1993 quiet_cmd_clang_tools = CHECK $< 1994 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1995 1996 clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 1997 $(call cmd,clang_tools) 1998 else 1999 clang-tidy clang-analyzer: 2000 @echo "$@ requires CC=clang" >&2 2001 @false 2002 endif 2003 2004 # Scripts to check various things for consistency 2005 # --------------------------------------------------------------------------- 2006 2007 PHONY += includecheck versioncheck coccicheck export_report 2008 2009 includecheck: 2010 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2011 -name '*.[hcS]' -type f -print | sort \ 2012 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 2013 2014 versioncheck: 2015 find $(srctree)/* $(RCS_FIND_IGNORE) \ 2016 -name '*.[hcS]' -type f -print | sort \ 2017 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 2018 2019 coccicheck: 2020 $(Q)$(BASH) $(srctree)/scripts/$@ 2021 2022 export_report: 2023 $(PERL) $(srctree)/scripts/export_report.pl 2024 2025 PHONY += checkstack kernelrelease kernelversion image_name 2026 2027 # UML needs a little special treatment here. It wants to use the host 2028 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 2029 # else wants $(ARCH), including people doing cross-builds, which means 2030 # that $(SUBARCH) doesn't work here. 2031 ifeq ($(ARCH), um) 2032 CHECKSTACK_ARCH := $(SUBARCH) 2033 else 2034 CHECKSTACK_ARCH := $(ARCH) 2035 endif 2036 MINSTACKSIZE ?= 100 2037 checkstack: 2038 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 2039 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) 2040 2041 kernelrelease: 2042 @$(filechk_kernel.release) 2043 2044 kernelversion: 2045 @echo $(KERNELVERSION) 2046 2047 image_name: 2048 @echo $(KBUILD_IMAGE) 2049 2050 PHONY += run-command 2051 run-command: 2052 $(Q)$(KBUILD_RUN_COMMAND) 2053 2054 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 2055 cmd_rmfiles = rm -rf $(rm-files) 2056 2057 # read saved command lines for existing targets 2058 existing-targets := $(wildcard $(sort $(targets))) 2059 2060 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 2061 2062 endif # config-build 2063 endif # mixed-build 2064 endif # need-sub-make 2065 2066 PHONY += FORCE 2067 FORCE: 2068 2069 # Declare the contents of the PHONY variable as phony. We keep that 2070 # information in a variable so we can use it in if_changed and friends. 2071 .PHONY: $(PHONY)
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