Makefile

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