Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 6
   3 PATCHLEVEL = 5
   4 SUBLEVEL = 0
   5 EXTRAVERSION = -rc1
   6 NAME = Hurr durr I'ma ninja sloth
   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 ($(filter undefine,$(.FEATURES)),)
  15 $(error GNU Make >= 3.82 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 export abs_srctree := $(realpath $(dir $(this-makefile)))
  43 export 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, $(KBUILD_VERBOSE)),)
  90   quiet =
  91   Q =
  92 endif
  93
  94 # If the user is running make -s (silent mode), suppress echoing of
  95 # commands
  96 # make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS.
  97
  98 ifeq ($(filter 3.%,$(MAKE_VERSION)),)
  99 short-opts := $(firstword -$(MAKEFLAGS))
 100 else
 101 short-opts := $(filter-out --%,$(MAKEFLAGS))
 102 endif
 103
 104 ifneq ($(findstring s,$(short-opts)),)
 105 quiet=silent_
 106 override KBUILD_VERBOSE :=
 107 endif
 108
 109 export quiet Q KBUILD_VERBOSE
 110
 111 # Call a source code checker (by default, "sparse") as part of the
 112 # C compilation.
 113 #
 114 # Use 'make C=1' to enable checking of only re-compiled files.
 115 # Use 'make C=2' to enable checking of *all* source files, regardless
 116 # of whether they are re-compiled or not.
 117 #
 118 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 119 # including where to get the "sparse" utility.
 120
 121 ifeq ("$(origin C)", "command line")
 122   KBUILD_CHECKSRC = $(C)
 123 endif
 124 ifndef KBUILD_CHECKSRC
 125   KBUILD_CHECKSRC = 0
 126 endif
 127
 128 export KBUILD_CHECKSRC
 129
 130 # Enable "clippy" (a linter) as part of the Rust compilation.
 131 #
 132 # Use 'make CLIPPY=1' to enable it.
 133 ifeq ("$(origin CLIPPY)", "command line")
 134   KBUILD_CLIPPY := $(CLIPPY)
 135 endif
 136
 137 export KBUILD_CLIPPY
 138
 139 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
 140 # directory of external module to build. Setting M= takes precedence.
 141 ifeq ("$(origin M)", "command line")
 142   KBUILD_EXTMOD := $(M)
 143 endif
 144
 145 $(if $(word 2, $(KBUILD_EXTMOD)), \
 146         $(error building multiple external modules is not supported))
 147
 148 $(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \
 149         $(error module directory path cannot contain '$x')))
 150
 151 # Remove trailing slashes
 152 ifneq ($(filter %/, $(KBUILD_EXTMOD)),)
 153 KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).)
 154 endif
 155
 156 export KBUILD_EXTMOD
 157
 158 # Kbuild will save output files in the current working directory.
 159 # This does not need to match to the root of the kernel source tree.
 160 #
 161 # For example, you can do this:
 162 #
 163 #  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
 164 #
 165 # If you want to save output files in a different location, there are
 166 # two syntaxes to specify it.
 167 #
 168 # 1) O=
 169 # Use "make O=dir/to/store/output/files/"
 170 #
 171 # 2) Set KBUILD_OUTPUT
 172 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
 173 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
 174 #
 175 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 176 # variable.
 177
 178 # Do we want to change the working directory?
 179 ifeq ("$(origin O)", "command line")
 180   KBUILD_OUTPUT := $(O)
 181 endif
 182
 183 ifneq ($(KBUILD_OUTPUT),)
 184 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
 185 # expand a shell special character '~'. We use a somewhat tedious way here.
 186 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
 187 $(if $(abs_objtree),, \
 188      $(error failed to create output directory "$(KBUILD_OUTPUT)"))
 189
 190 # $(realpath ...) resolves symlinks
 191 abs_objtree := $(realpath $(abs_objtree))
 192 endif # ifneq ($(KBUILD_OUTPUT),)
 193
 194 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
 195 $(error source directory cannot contain spaces or colons)
 196 endif
 197
 198 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
 199 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
 200 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
 201 need-sub-make := 1
 202 # Cancel implicit rules for this Makefile.
 203 $(this-makefile): ;
 204 endif
 205
 206 export sub_make_done := 1
 207
 208 endif # sub_make_done
 209
 210 ifeq ($(abs_objtree),$(CURDIR))
 211 # Suppress "Entering directory ..." if we are at the final work directory.
 212 no-print-directory := --no-print-directory
 213 else
 214 # Recursion to show "Entering directory ..."
 215 need-sub-make := 1
 216 endif
 217
 218 ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),)
 219 # If --no-print-directory is unset, recurse once again to set it.
 220 # You may end up recursing into __sub-make twice. This is needed due to the
 221 # behavior change in GNU Make 4.4.1.
 222 need-sub-make := 1
 223 endif
 224
 225 ifeq ($(need-sub-make),1)
 226
 227 PHONY += $(MAKECMDGOALS) __sub-make
 228
 229 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
 230         @:
 231
 232 # Invoke a second make in the output directory, passing relevant variables
 233 __sub-make:
 234         $(Q)$(MAKE) $(no-print-directory) -C $(abs_objtree) \
 235         -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
 236
 237 else # need-sub-make
 238
 239 # We process the rest of the Makefile if this is the final invocation of make
 240
 241 ifeq ($(abs_srctree),$(abs_objtree))
 242         # building in the source tree
 243         srctree := .
 244         building_out_of_srctree :=
 245 else
 246         ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
 247                 # building in a subdirectory of the source tree
 248                 srctree := ..
 249         else
 250                 srctree := $(abs_srctree)
 251         endif
 252         building_out_of_srctree := 1
 253 endif
 254
 255 ifneq ($(KBUILD_ABS_SRCTREE),)
 256 srctree := $(abs_srctree)
 257 endif
 258
 259 objtree         := .
 260 VPATH           := $(srctree)
 261
 262 export building_out_of_srctree srctree objtree VPATH
 263
 264 # To make sure we do not include .config for any of the *config targets
 265 # catch them early, and hand them over to scripts/kconfig/Makefile
 266 # It is allowed to specify more targets when calling make, including
 267 # mixing *config targets and build targets.
 268 # For example 'make oldconfig all'.
 269 # Detect when mixed targets is specified, and make a second invocation
 270 # of make so .config is not included in this case either (for *config).
 271
 272 version_h := include/generated/uapi/linux/version.h
 273
 274 clean-targets := %clean mrproper cleandocs
 275 no-dot-config-targets := $(clean-targets) \
 276                          cscope gtags TAGS tags help% %docs check% coccicheck \
 277                          $(version_h) headers headers_% archheaders archscripts \
 278                          %asm-generic kernelversion %src-pkg dt_binding_check \
 279                          outputmakefile rustavailable rustfmt rustfmtcheck
 280 # Installation targets should not require compiler. Unfortunately, vdso_install
 281 # is an exception where build artifacts may be updated. This must be fixed.
 282 no-compiler-targets := $(no-dot-config-targets) install dtbs_install \
 283                         headers_install modules_install kernelrelease image_name
 284 no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \
 285                           image_name
 286 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/
 287
 288 config-build    :=
 289 mixed-build     :=
 290 need-config     := 1
 291 need-compiler   := 1
 292 may-sync-config := 1
 293 single-build    :=
 294
 295 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 296         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 297                 need-config :=
 298         endif
 299 endif
 300
 301 ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),)
 302         ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),)
 303                 need-compiler :=
 304         endif
 305 endif
 306
 307 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 308         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 309                 may-sync-config :=
 310         endif
 311 endif
 312
 313 ifneq ($(KBUILD_EXTMOD),)
 314         may-sync-config :=
 315 endif
 316
 317 ifeq ($(KBUILD_EXTMOD),)
 318         ifneq ($(filter %config,$(MAKECMDGOALS)),)
 319                 config-build := 1
 320                 ifneq ($(words $(MAKECMDGOALS)),1)
 321                         mixed-build := 1
 322                 endif
 323         endif
 324 endif
 325
 326 # We cannot build single targets and the others at the same time
 327 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
 328         single-build := 1
 329         ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
 330                 mixed-build := 1
 331         endif
 332 endif
 333
 334 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 335 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 336         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 337                 mixed-build := 1
 338         endif
 339 endif
 340
 341 # install and modules_install need also be processed one by one
 342 ifneq ($(filter install,$(MAKECMDGOALS)),)
 343         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 344                 mixed-build := 1
 345         endif
 346 endif
 347
 348 ifdef mixed-build
 349 # ===========================================================================
 350 # We're called with mixed targets (*config and build targets).
 351 # Handle them one by one.
 352
 353 PHONY += $(MAKECMDGOALS) __build_one_by_one
 354
 355 $(MAKECMDGOALS): __build_one_by_one
 356         @:
 357
 358 __build_one_by_one:
 359         $(Q)set -e; \
 360         for i in $(MAKECMDGOALS); do \
 361                 $(MAKE) -f $(srctree)/Makefile $$i; \
 362         done
 363
 364 else # !mixed-build
 365
 366 include $(srctree)/scripts/Kbuild.include
 367
 368 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 369 KERNELRELEASE = $(call read-file, include/config/kernel.release)
 370 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 371 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 372
 373 include $(srctree)/scripts/subarch.include
 374
 375 # Cross compiling and selecting different set of gcc/bin-utils
 376 # ---------------------------------------------------------------------------
 377 #
 378 # When performing cross compilation for other architectures ARCH shall be set
 379 # to the target architecture. (See arch/* for the possibilities).
 380 # ARCH can be set during invocation of make:
 381 # make ARCH=ia64
 382 # Another way is to have ARCH set in the environment.
 383 # The default ARCH is the host where make is executed.
 384
 385 # CROSS_COMPILE specify the prefix used for all executables used
 386 # during compilation. Only gcc and related bin-utils executables
 387 # are prefixed with $(CROSS_COMPILE).
 388 # CROSS_COMPILE can be set on the command line
 389 # make CROSS_COMPILE=ia64-linux-
 390 # Alternatively CROSS_COMPILE can be set in the environment.
 391 # Default value for CROSS_COMPILE is not to prefix executables
 392 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 393 ARCH            ?= $(SUBARCH)
 394
 395 # Architecture as present in compile.h
 396 UTS_MACHINE     := $(ARCH)
 397 SRCARCH         := $(ARCH)
 398
 399 # Additional ARCH settings for x86
 400 ifeq ($(ARCH),i386)
 401         SRCARCH := x86
 402 endif
 403 ifeq ($(ARCH),x86_64)
 404         SRCARCH := x86
 405 endif
 406
 407 # Additional ARCH settings for sparc
 408 ifeq ($(ARCH),sparc32)
 409        SRCARCH := sparc
 410 endif
 411 ifeq ($(ARCH),sparc64)
 412        SRCARCH := sparc
 413 endif
 414
 415 # Additional ARCH settings for parisc
 416 ifeq ($(ARCH),parisc64)
 417        SRCARCH := parisc
 418 endif
 419
 420 export cross_compiling :=
 421 ifneq ($(SRCARCH),$(SUBARCH))
 422 cross_compiling := 1
 423 endif
 424
 425 KCONFIG_CONFIG  ?= .config
 426 export KCONFIG_CONFIG
 427
 428 # SHELL used by kbuild
 429 CONFIG_SHELL := sh
 430
 431 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 432 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 433 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 434
 435 ifneq ($(LLVM),)
 436 ifneq ($(filter %/,$(LLVM)),)
 437 LLVM_PREFIX := $(LLVM)
 438 else ifneq ($(filter -%,$(LLVM)),)
 439 LLVM_SUFFIX := $(LLVM)
 440 endif
 441
 442 HOSTCC  = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
 443 HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX)
 444 else
 445 HOSTCC  = gcc
 446 HOSTCXX = g++
 447 endif
 448 HOSTRUSTC = rustc
 449 HOSTPKG_CONFIG  = pkg-config
 450
 451 KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
 452                          -O2 -fomit-frame-pointer -std=gnu11
 453 KBUILD_USERCFLAGS  := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS)
 454 KBUILD_USERLDFLAGS := $(USERLDFLAGS)
 455
 456 # These flags apply to all Rust code in the tree, including the kernel and
 457 # host programs.
 458 export rust_common_flags := --edition=2021 \
 459                             -Zbinary_dep_depinfo=y \
 460                             -Dunsafe_op_in_unsafe_fn -Drust_2018_idioms \
 461                             -Dunreachable_pub -Dnon_ascii_idents \
 462                             -Wmissing_docs \
 463                             -Drustdoc::missing_crate_level_docs \
 464                             -Dclippy::correctness -Dclippy::style \
 465                             -Dclippy::suspicious -Dclippy::complexity \
 466                             -Dclippy::perf \
 467                             -Dclippy::let_unit_value -Dclippy::mut_mut \
 468                             -Dclippy::needless_bitwise_bool \
 469                             -Dclippy::needless_continue \
 470                             -Wclippy::dbg_macro
 471
 472 KBUILD_HOSTCFLAGS   := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
 473 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 474 KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \
 475                         -Zallow-features= $(HOSTRUSTFLAGS)
 476 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 477 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 478
 479 # Make variables (CC, etc...)
 480 CPP             = $(CC) -E
 481 ifneq ($(LLVM),)
 482 CC              = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
 483 LD              = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX)
 484 AR              = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX)
 485 NM              = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX)
 486 OBJCOPY         = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX)
 487 OBJDUMP         = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX)
 488 READELF         = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX)
 489 STRIP           = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX)
 490 else
 491 CC              = $(CROSS_COMPILE)gcc
 492 LD              = $(CROSS_COMPILE)ld
 493 AR              = $(CROSS_COMPILE)ar
 494 NM              = $(CROSS_COMPILE)nm
 495 OBJCOPY         = $(CROSS_COMPILE)objcopy
 496 OBJDUMP         = $(CROSS_COMPILE)objdump
 497 READELF         = $(CROSS_COMPILE)readelf
 498 STRIP           = $(CROSS_COMPILE)strip
 499 endif
 500 RUSTC           = rustc
 501 RUSTDOC         = rustdoc
 502 RUSTFMT         = rustfmt
 503 CLIPPY_DRIVER   = clippy-driver
 504 BINDGEN         = bindgen
 505 CARGO           = cargo
 506 PAHOLE          = pahole
 507 RESOLVE_BTFIDS  = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
 508 LEX             = flex
 509 YACC            = bison
 510 AWK             = awk
 511 INSTALLKERNEL  := installkernel
 512 DEPMOD          = depmod
 513 PERL            = perl
 514 PYTHON3         = python3
 515 CHECK           = sparse
 516 BASH            = bash
 517 KGZIP           = gzip
 518 KBZIP2          = bzip2
 519 KLZOP           = lzop
 520 LZMA            = lzma
 521 LZ4             = lz4c
 522 XZ              = xz
 523 ZSTD            = zstd
 524
 525 PAHOLE_FLAGS    = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh)
 526
 527 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 528                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 529 NOSTDINC_FLAGS :=
 530 CFLAGS_MODULE   =
 531 RUSTFLAGS_MODULE =
 532 AFLAGS_MODULE   =
 533 LDFLAGS_MODULE  =
 534 CFLAGS_KERNEL   =
 535 RUSTFLAGS_KERNEL =
 536 AFLAGS_KERNEL   =
 537 LDFLAGS_vmlinux =
 538
 539 # Use USERINCLUDE when you must reference the UAPI directories only.
 540 USERINCLUDE    := \
 541                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 542                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 543                 -I$(srctree)/include/uapi \
 544                 -I$(objtree)/include/generated/uapi \
 545                 -include $(srctree)/include/linux/compiler-version.h \
 546                 -include $(srctree)/include/linux/kconfig.h
 547
 548 # Use LINUXINCLUDE when you must reference the include/ directory.
 549 # Needed to be compatible with the O= option
 550 LINUXINCLUDE    := \
 551                 -I$(srctree)/arch/$(SRCARCH)/include \
 552                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 553                 $(if $(building_out_of_srctree),-I$(srctree)/include) \
 554                 -I$(objtree)/include \
 555                 $(USERINCLUDE)
 556
 557 KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 558 KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
 559                    -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
 560                    -Werror=implicit-function-declaration -Werror=implicit-int \
 561                    -Werror=return-type -Wno-format-security -funsigned-char \
 562                    -std=gnu11
 563 KBUILD_CPPFLAGS := -D__KERNEL__
 564 KBUILD_RUSTFLAGS := $(rust_common_flags) \
 565                     --target=$(objtree)/scripts/target.json \
 566                     -Cpanic=abort -Cembed-bitcode=n -Clto=n \
 567                     -Cforce-unwind-tables=n -Ccodegen-units=1 \
 568                     -Csymbol-mangling-version=v0 \
 569                     -Crelocation-model=static \
 570                     -Zfunction-sections=n \
 571                     -Dclippy::float_arithmetic
 572
 573 KBUILD_AFLAGS_KERNEL :=
 574 KBUILD_CFLAGS_KERNEL :=
 575 KBUILD_RUSTFLAGS_KERNEL :=
 576 KBUILD_AFLAGS_MODULE  := -DMODULE
 577 KBUILD_CFLAGS_MODULE  := -DMODULE
 578 KBUILD_RUSTFLAGS_MODULE := --cfg MODULE
 579 KBUILD_LDFLAGS_MODULE :=
 580 KBUILD_LDFLAGS :=
 581 CLANG_FLAGS :=
 582
 583 ifeq ($(KBUILD_CLIPPY),1)
 584         RUSTC_OR_CLIPPY_QUIET := CLIPPY
 585         RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER)
 586 else
 587         RUSTC_OR_CLIPPY_QUIET := RUSTC
 588         RUSTC_OR_CLIPPY = $(RUSTC)
 589 endif
 590
 591 ifdef RUST_LIB_SRC
 592         export RUST_LIB_SRC
 593 endif
 594
 595 # Allows the usage of unstable features in stable compilers.
 596 export RUSTC_BOOTSTRAP := 1
 597
 598 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG
 599 export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO
 600 export HOSTRUSTC KBUILD_HOSTRUSTFLAGS
 601 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
 602 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
 603 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
 604 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
 605 export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS
 606
 607 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 608 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 609 export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE
 610 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 611 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 612 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL
 613 export PAHOLE_FLAGS
 614
 615 # Files to ignore in find ... statements
 616
 617 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 618                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 619                           -prune -o
 620 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 621                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 622
 623 # ===========================================================================
 624 # Rules shared between *config targets and build targets
 625
 626 # Basic helpers built in scripts/basic/
 627 PHONY += scripts_basic
 628 scripts_basic:
 629         $(Q)$(MAKE) $(build)=scripts/basic
 630
 631 PHONY += outputmakefile
 632 ifdef building_out_of_srctree
 633 # Before starting out-of-tree build, make sure the source tree is clean.
 634 # outputmakefile generates a Makefile in the output directory, if using a
 635 # separate output directory. This allows convenient use of make in the
 636 # output directory.
 637 # At the same time when output Makefile generated, generate .gitignore to
 638 # ignore whole output directory
 639
 640 quiet_cmd_makefile = GEN     Makefile
 641       cmd_makefile = { \
 642         echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \
 643         echo "include $(srctree)/Makefile"; \
 644         } > Makefile
 645
 646 outputmakefile:
 647         @if [ -f $(srctree)/.config -o \
 648                  -d $(srctree)/include/config -o \
 649                  -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
 650                 echo >&2 "***"; \
 651                 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
 652                 echo >&2 "*** in $(abs_srctree)";\
 653                 echo >&2 "***"; \
 654                 false; \
 655         fi
 656         $(Q)ln -fsn $(srctree) source
 657         $(call cmd,makefile)
 658         $(Q)test -e .gitignore || \
 659         { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
 660 endif
 661
 662 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 663 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 664 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 665 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 666 CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1))
 667
 668 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
 669 include $(srctree)/scripts/Makefile.clang
 670 endif
 671
 672 # Include this also for config targets because some architectures need
 673 # cc-cross-prefix to determine CROSS_COMPILE.
 674 ifdef need-compiler
 675 include $(srctree)/scripts/Makefile.compiler
 676 endif
 677
 678 ifdef config-build
 679 # ===========================================================================
 680 # *config targets only - make sure prerequisites are updated, and descend
 681 # in scripts/kconfig to make the *config target
 682
 683 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 684 # KBUILD_DEFCONFIG may point out an alternative default configuration
 685 # used for 'make defconfig'
 686 include $(srctree)/arch/$(SRCARCH)/Makefile
 687 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 688
 689 config: outputmakefile scripts_basic FORCE
 690         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 691
 692 %config: outputmakefile scripts_basic FORCE
 693         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 694
 695 else #!config-build
 696 # ===========================================================================
 697 # Build targets only - this includes vmlinux, arch specific targets, clean
 698 # targets and others. In general all targets except *config targets.
 699
 700 # If building an external module we do not care about the all: rule
 701 # but instead __all depend on modules
 702 PHONY += all
 703 ifeq ($(KBUILD_EXTMOD),)
 704 __all: all
 705 else
 706 __all: modules
 707 endif
 708
 709 targets :=
 710
 711 # Decide whether to build built-in, modular, or both.
 712 # Normally, just do built-in.
 713
 714 KBUILD_MODULES :=
 715 KBUILD_BUILTIN := 1
 716
 717 # If we have only "make modules", don't compile built-in objects.
 718 ifeq ($(MAKECMDGOALS),modules)
 719   KBUILD_BUILTIN :=
 720 endif
 721
 722 # If we have "make <whatever> modules", compile modules
 723 # in addition to whatever we do anyway.
 724 # Just "make" or "make all" shall build modules as well
 725
 726 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
 727   KBUILD_MODULES := 1
 728 endif
 729
 730 ifeq ($(MAKECMDGOALS),)
 731   KBUILD_MODULES := 1
 732 endif
 733
 734 export KBUILD_MODULES KBUILD_BUILTIN
 735
 736 ifdef need-config
 737 include include/config/auto.conf
 738 endif
 739
 740 ifeq ($(KBUILD_EXTMOD),)
 741 # Objects we will link into vmlinux / subdirs we need to visit
 742 core-y          :=
 743 drivers-y       :=
 744 libs-y          := lib/
 745 endif # KBUILD_EXTMOD
 746
 747 # The all: target is the default when no target is given on the
 748 # command line.
 749 # This allow a user to issue only 'make' to build a kernel including modules
 750 # Defaults to vmlinux, but the arch makefile usually adds further targets
 751 all: vmlinux
 752
 753 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage
 754 ifdef CONFIG_CC_IS_GCC
 755 CFLAGS_GCOV     += -fno-tree-loop-im
 756 endif
 757 export CFLAGS_GCOV
 758
 759 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 760 ifdef CONFIG_FUNCTION_TRACER
 761   CC_FLAGS_FTRACE := -pg
 762 endif
 763
 764 include $(srctree)/arch/$(SRCARCH)/Makefile
 765
 766 ifdef need-config
 767 ifdef may-sync-config
 768 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 769 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 770 # because some architectures define CROSS_COMPILE there.
 771 include include/config/auto.conf.cmd
 772
 773 $(KCONFIG_CONFIG):
 774         @echo >&2 '***'
 775         @echo >&2 '*** Configuration file "$@" not found!'
 776         @echo >&2 '***'
 777         @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
 778         @echo >&2 '*** "make menuconfig" or "make xconfig").'
 779         @echo >&2 '***'
 780         @/bin/false
 781
 782 # The actual configuration files used during the build are stored in
 783 # include/generated/ and include/config/. Update them if .config is newer than
 784 # include/config/auto.conf (which mirrors .config).
 785 #
 786 # This exploits the 'multi-target pattern rule' trick.
 787 # The syncconfig should be executed only once to make all the targets.
 788 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
 789 #
 790 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
 791 # so you cannot notice that Kconfig is waiting for the user input.
 792 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG)
 793         $(Q)$(kecho) "  SYNC    $@"
 794         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 795 else # !may-sync-config
 796 # External modules and some install targets need include/generated/autoconf.h
 797 # and include/config/auto.conf but do not care if they are up-to-date.
 798 # Use auto.conf to trigger the test
 799 PHONY += include/config/auto.conf
 800
 801 include/config/auto.conf:
 802         @test -e include/generated/autoconf.h -a -e $@ || (             \
 803         echo >&2;                                                       \
 804         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 805         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 806         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 807         echo >&2 ;                                                      \
 808         /bin/false)
 809
 810 endif # may-sync-config
 811 endif # need-config
 812
 813 KBUILD_CFLAGS   += -fno-delete-null-pointer-checks
 814 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 815 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 816 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 817 KBUILD_CFLAGS   += $(call cc-disable-warning, address-of-packed-member)
 818
 819 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
 820 KBUILD_CFLAGS += -O2
 821 KBUILD_RUSTFLAGS += -Copt-level=2
 822 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 823 KBUILD_CFLAGS += -Os
 824 KBUILD_RUSTFLAGS += -Copt-level=s
 825 endif
 826
 827 # Always set `debug-assertions` and `overflow-checks` because their default
 828 # depends on `opt-level` and `debug-assertions`, respectively.
 829 KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n)
 830 KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n)
 831
 832 # Tell gcc to never replace conditional load with a non-conditional one
 833 ifdef CONFIG_CC_IS_GCC
 834 # gcc-10 renamed --param=allow-store-data-races=0 to
 835 # -fno-allow-store-data-races.
 836 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 837 KBUILD_CFLAGS   += $(call cc-option,-fno-allow-store-data-races)
 838 endif
 839
 840 ifdef CONFIG_READABLE_ASM
 841 # Disable optimizations that make assembler listings hard to read.
 842 # reorder blocks reorders the control in the function
 843 # ipa clone creates specialized cloned functions
 844 # partial inlining inlines only parts of functions
 845 KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining
 846 endif
 847
 848 ifneq ($(CONFIG_FRAME_WARN),0)
 849 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
 850 endif
 851
 852 stackp-flags-y                                    := -fno-stack-protector
 853 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 854 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 855
 856 KBUILD_CFLAGS += $(stackp-flags-y)
 857
 858 KBUILD_CPPFLAGS-$(CONFIG_WERROR) += -Werror
 859 KBUILD_CPPFLAGS += $(KBUILD_CPPFLAGS-y)
 860 KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUNDS) += -Wno-array-bounds
 861
 862 KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings
 863 KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y)
 864
 865 ifdef CONFIG_CC_IS_CLANG
 866 # The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable.
 867 KBUILD_CFLAGS += -Wno-gnu
 868 else
 869
 870 # gcc inanely warns about local variables called 'main'
 871 KBUILD_CFLAGS += -Wno-main
 872 endif
 873
 874 # These warnings generated too much noise in a regular build.
 875 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 876 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
 877 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 878
 879 # These result in bogus false positives
 880 KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer)
 881
 882 ifdef CONFIG_FRAME_POINTER
 883 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 884 KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y
 885 else
 886 # Some targets (ARM with Thumb2, for example), can't be built with frame
 887 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 888 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 889 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 890 # -fomit-frame-pointer with FUNCTION_TRACER.
 891 # In the Rust target specification, "frame-pointer" is set explicitly
 892 # to "may-omit".
 893 ifndef CONFIG_FUNCTION_TRACER
 894 KBUILD_CFLAGS   += -fomit-frame-pointer
 895 endif
 896 endif
 897
 898 # Initialize all stack variables with a 0xAA pattern.
 899 ifdef CONFIG_INIT_STACK_ALL_PATTERN
 900 KBUILD_CFLAGS   += -ftrivial-auto-var-init=pattern
 901 endif
 902
 903 # Initialize all stack variables with a zero value.
 904 ifdef CONFIG_INIT_STACK_ALL_ZERO
 905 KBUILD_CFLAGS   += -ftrivial-auto-var-init=zero
 906 ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER
 907 # https://github.com/llvm/llvm-project/issues/44842
 908 CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
 909 export CC_AUTO_VAR_INIT_ZERO_ENABLER
 910 KBUILD_CFLAGS   += $(CC_AUTO_VAR_INIT_ZERO_ENABLER)
 911 endif
 912 endif
 913
 914 # While VLAs have been removed, GCC produces unreachable stack probes
 915 # for the randomize_kstack_offset feature. Disable it for all compilers.
 916 KBUILD_CFLAGS   += $(call cc-option, -fno-stack-clash-protection)
 917
 918 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
 919 ifdef CONFIG_ZERO_CALL_USED_REGS
 920 KBUILD_CFLAGS   += -fzero-call-used-regs=used-gpr
 921 endif
 922
 923 ifdef CONFIG_FUNCTION_TRACER
 924 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
 925   CC_FLAGS_FTRACE       += -mrecord-mcount
 926   ifdef CONFIG_HAVE_NOP_MCOUNT
 927     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 928       CC_FLAGS_FTRACE   += -mnop-mcount
 929       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 930     endif
 931   endif
 932 endif
 933 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
 934   ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT
 935     CC_FLAGS_USING      += -DCC_USING_NOP_MCOUNT
 936   endif
 937 endif
 938 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
 939   ifdef CONFIG_HAVE_C_RECORDMCOUNT
 940     BUILD_C_RECORDMCOUNT := y
 941     export BUILD_C_RECORDMCOUNT
 942   endif
 943 endif
 944 ifdef CONFIG_HAVE_FENTRY
 945   # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
 946   ifeq ($(call cc-option-yn, -mfentry),y)
 947     CC_FLAGS_FTRACE     += -mfentry
 948     CC_FLAGS_USING      += -DCC_USING_FENTRY
 949   endif
 950 endif
 951 export CC_FLAGS_FTRACE
 952 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 953 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 954 endif
 955
 956 # We trigger additional mismatches with less inlining
 957 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 958 KBUILD_CFLAGS += -fno-inline-functions-called-once
 959 endif
 960
 961 # `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0).
 962 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 963 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 964 KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y
 965 LDFLAGS_vmlinux += --gc-sections
 966 endif
 967
 968 ifdef CONFIG_SHADOW_CALL_STACK
 969 ifndef CONFIG_DYNAMIC_SCS
 970 CC_FLAGS_SCS    := -fsanitize=shadow-call-stack
 971 KBUILD_CFLAGS   += $(CC_FLAGS_SCS)
 972 endif
 973 export CC_FLAGS_SCS
 974 endif
 975
 976 ifdef CONFIG_LTO_CLANG
 977 ifdef CONFIG_LTO_CLANG_THIN
 978 CC_FLAGS_LTO    := -flto=thin -fsplit-lto-unit
 979 KBUILD_LDFLAGS  += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache
 980 else
 981 CC_FLAGS_LTO    := -flto
 982 endif
 983 CC_FLAGS_LTO    += -fvisibility=hidden
 984
 985 # Limit inlining across translation units to reduce binary size
 986 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
 987
 988 # Check for frame size exceeding threshold during prolog/epilog insertion
 989 # when using lld < 13.0.0.
 990 ifneq ($(CONFIG_FRAME_WARN),0)
 991 ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 130000),y)
 992 KBUILD_LDFLAGS  += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN)
 993 endif
 994 endif
 995 endif
 996
 997 ifdef CONFIG_LTO
 998 KBUILD_CFLAGS   += -fno-lto $(CC_FLAGS_LTO)
 999 KBUILD_AFLAGS   += -fno-lto
1000 export CC_FLAGS_LTO
1001 endif
1002
1003 ifdef CONFIG_CFI_CLANG
1004 CC_FLAGS_CFI    := -fsanitize=kcfi
1005 KBUILD_CFLAGS   += $(CC_FLAGS_CFI)
1006 export CC_FLAGS_CFI
1007 endif
1008
1009 ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0)
1010 KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT)
1011 endif
1012
1013 # arch Makefile may override CC so keep this after arch Makefile is included
1014 NOSTDINC_FLAGS += -nostdinc
1015
1016 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
1017 KBUILD_CFLAGS += -Wvla
1018
1019 # disable pointer signed / unsigned warnings in gcc 4.0
1020 KBUILD_CFLAGS += -Wno-pointer-sign
1021
1022 # In order to make sure new function cast mismatches are not introduced
1023 # in the kernel (to avoid tripping CFI checking), the kernel should be
1024 # globally built with -Wcast-function-type.
1025 KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type)
1026
1027 # To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE,
1028 # the kernel uses only C99 flexible arrays for dynamically sized trailing
1029 # arrays. Enforce this for everything that may examine structure sizes and
1030 # perform bounds checking.
1031 KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3)
1032
1033 # disable stringop warnings in gcc 8+
1034 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
1035
1036 # We'll want to enable this eventually, but it's not going away for 5.7 at least
1037 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
1038
1039 # Another good warning that we'll want to enable eventually
1040 KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
1041
1042 # Enabled with W=2, disabled by default as noisy
1043 ifdef CONFIG_CC_IS_GCC
1044 KBUILD_CFLAGS += -Wno-maybe-uninitialized
1045 endif
1046
1047 # The allocators already balk at large sizes, so silence the compiler
1048 # warnings for bounds checks involving those possible values. While
1049 # -Wno-alloc-size-larger-than would normally be used here, earlier versions
1050 # of gcc (<9.1) weirdly don't handle the option correctly when _other_
1051 # warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX
1052 # doesn't work (as it is documented to), silently resolving to "0" prior to
1053 # version 9.1 (and producing an error more recently). Numeric values larger
1054 # than PTRDIFF_MAX also don't work prior to version 9.1, which are silently
1055 # ignored, continuing to default to PTRDIFF_MAX. So, left with no other
1056 # choice, we must perform a versioned check to disable this warning.
1057 # https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au
1058 KBUILD_CFLAGS-$(call gcc-min-version, 90100) += -Wno-alloc-size-larger-than
1059 KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH)
1060
1061 # disable invalid "can't wrap" optimizations for signed / pointers
1062 KBUILD_CFLAGS   += -fno-strict-overflow
1063
1064 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
1065 KBUILD_CFLAGS  += -fno-stack-check
1066
1067 # conserve stack if available
1068 ifdef CONFIG_CC_IS_GCC
1069 KBUILD_CFLAGS   += -fconserve-stack
1070 endif
1071
1072 # Prohibit date/time macros, which would make the build non-deterministic
1073 KBUILD_CFLAGS   += -Werror=date-time
1074
1075 # enforce correct pointer usage
1076 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
1077
1078 # Require designated initializers for all marked structures
1079 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
1080
1081 # change __FILE__ to the relative path from the srctree
1082 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
1083
1084 # include additional Makefiles when needed
1085 include-y                       := scripts/Makefile.extrawarn
1086 include-$(CONFIG_DEBUG_INFO)    += scripts/Makefile.debug
1087 include-$(CONFIG_KASAN)         += scripts/Makefile.kasan
1088 include-$(CONFIG_KCSAN)         += scripts/Makefile.kcsan
1089 include-$(CONFIG_KMSAN)         += scripts/Makefile.kmsan
1090 include-$(CONFIG_UBSAN)         += scripts/Makefile.ubsan
1091 include-$(CONFIG_KCOV)          += scripts/Makefile.kcov
1092 include-$(CONFIG_RANDSTRUCT)    += scripts/Makefile.randstruct
1093 include-$(CONFIG_GCC_PLUGINS)   += scripts/Makefile.gcc-plugins
1094
1095 include $(addprefix $(srctree)/, $(include-y))
1096
1097 # scripts/Makefile.gcc-plugins is intentionally included last.
1098 # Do not add $(call cc-option,...) below this line. When you build the kernel
1099 # from the clean source tree, the GCC plugins do not exist at this point.
1100
1101 # Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments
1102 KBUILD_CPPFLAGS += $(KCPPFLAGS)
1103 KBUILD_AFLAGS   += $(KAFLAGS)
1104 KBUILD_CFLAGS   += $(KCFLAGS)
1105 KBUILD_RUSTFLAGS += $(KRUSTFLAGS)
1106
1107 KBUILD_LDFLAGS_MODULE += --build-id=sha1
1108 LDFLAGS_vmlinux += --build-id=sha1
1109
1110 KBUILD_LDFLAGS  += -z noexecstack
1111 ifeq ($(CONFIG_LD_IS_BFD),y)
1112 KBUILD_LDFLAGS  += $(call ld-option,--no-warn-rwx-segments)
1113 endif
1114
1115 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
1116 LDFLAGS_vmlinux += -X
1117 endif
1118
1119 ifeq ($(CONFIG_RELR),y)
1120 # ld.lld before 15 did not support -z pack-relative-relocs.
1121 LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs)
1122 endif
1123
1124 # We never want expected sections to be placed heuristically by the
1125 # linker. All sections should be explicitly named in the linker script.
1126 ifdef CONFIG_LD_ORPHAN_WARN
1127 LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL)
1128 endif
1129
1130 # Align the bit size of userspace programs with the kernel
1131 KBUILD_USERCFLAGS  += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1132 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1133
1134 # make the checker run with the right architecture
1135 CHECKFLAGS += --arch=$(ARCH)
1136
1137 # insure the checker run with the right endianness
1138 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1139
1140 # the checker needs the correct machine size
1141 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1142
1143 # Default kernel image to build when no specific target is given.
1144 # KBUILD_IMAGE may be overruled on the command line or
1145 # set in the environment
1146 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1147 # this default value
1148 export KBUILD_IMAGE ?= vmlinux
1149
1150 #
1151 # INSTALL_PATH specifies where to place the updated kernel and system map
1152 # images. Default is /boot, but you can set it to other values
1153 export  INSTALL_PATH ?= /boot
1154
1155 #
1156 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1157 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1158 # an argument if needed. Otherwise it defaults to the kernel install path
1159 #
1160 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1161
1162 #
1163 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1164 # relocations required by build roots.  This is not defined in the
1165 # makefile but the argument can be passed to make if needed.
1166 #
1167
1168 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1169 export MODLIB
1170
1171 PHONY += prepare0
1172
1173 export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
1174 export MODORDER := $(extmod_prefix)modules.order
1175 export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps
1176
1177 ifeq ($(KBUILD_EXTMOD),)
1178
1179 build-dir       := .
1180 clean-dirs      := $(sort . Documentation \
1181                      $(patsubst %/,%,$(filter %/, $(core-) \
1182                         $(drivers-) $(libs-))))
1183
1184 export ARCH_CORE        := $(core-y)
1185 export ARCH_LIB         := $(filter %/, $(libs-y))
1186 export ARCH_DRIVERS     := $(drivers-y) $(drivers-m)
1187 # Externally visible symbols (used by link-vmlinux.sh)
1188
1189 KBUILD_VMLINUX_OBJS := ./built-in.a
1190 ifdef CONFIG_MODULES
1191 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1192 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1193 else
1194 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1195 endif
1196
1197 export KBUILD_VMLINUX_LIBS
1198 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1199
1200 ifdef CONFIG_TRIM_UNUSED_KSYMS
1201 # For the kernel to actually contain only the needed exported symbols,
1202 # we have to build modules as well to determine what those symbols are.
1203 KBUILD_MODULES := 1
1204 endif
1205
1206 # '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14
1207 quiet_cmd_ar_vmlinux.a = AR      $@
1208       cmd_ar_vmlinux.a = \
1209         rm -f $@; \
1210         $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \
1211         $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt)
1212
1213 targets += vmlinux.a
1214 vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE
1215         $(call if_changed,ar_vmlinux.a)
1216
1217 PHONY += vmlinux_o
1218 vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS)
1219         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o
1220
1221 vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o
1222         @:
1223
1224 PHONY += vmlinux
1225 # LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux,
1226 # not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is
1227 # unrelated; the decompressors just happen to have the same base name,
1228 # arch/*/boot/compressed/vmlinux.
1229 # Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux.
1230 #
1231 # _LDFLAGS_vmlinux is a workaround for the 'private export' bug:
1232 #   https://savannah.gnu.org/bugs/?61463
1233 # For Make > 4.4, the following simple code will work:
1234 #  vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1235 vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1236 vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux)
1237 vmlinux: vmlinux.o $(KBUILD_LDS) modpost
1238         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux
1239
1240 # The actual objects are generated when descending,
1241 # make sure no implicit rule kicks in
1242 $(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ;
1243
1244 ifeq ($(origin KERNELRELEASE),file)
1245 filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree)
1246 else
1247 filechk_kernel.release = echo $(KERNELRELEASE)
1248 endif
1249
1250 # Store (new) KERNELRELEASE string in include/config/kernel.release
1251 include/config/kernel.release: FORCE
1252         $(call filechk,kernel.release)
1253
1254 # Additional helpers built in scripts/
1255 # Carefully list dependencies so we do not try to build scripts twice
1256 # in parallel
1257 PHONY += scripts
1258 scripts: scripts_basic scripts_dtc
1259         $(Q)$(MAKE) $(build)=$(@)
1260
1261 # Things we need to do before we recursively start building the kernel
1262 # or the modules are listed in "prepare".
1263 # A multi level approach is used. prepareN is processed before prepareN-1.
1264 # archprepare is used in arch Makefiles and when processed asm symlink,
1265 # version.h and scripts_basic is processed / created.
1266
1267 PHONY += prepare archprepare
1268
1269 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1270         asm-generic $(version_h) include/generated/utsrelease.h \
1271         include/generated/compile.h include/generated/autoconf.h remove-stale-files
1272
1273 prepare0: archprepare
1274         $(Q)$(MAKE) $(build)=scripts/mod
1275         $(Q)$(MAKE) $(build)=. prepare
1276
1277 # All the preparing..
1278 prepare: prepare0
1279 ifdef CONFIG_RUST
1280         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh -v
1281         $(Q)$(MAKE) $(build)=rust
1282 endif
1283
1284 PHONY += remove-stale-files
1285 remove-stale-files:
1286         $(Q)$(srctree)/scripts/remove-stale-files
1287
1288 # Support for using generic headers in asm-generic
1289 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1290
1291 PHONY += asm-generic uapi-asm-generic
1292 asm-generic: uapi-asm-generic
1293         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1294         generic=include/asm-generic
1295 uapi-asm-generic:
1296         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1297         generic=include/uapi/asm-generic
1298
1299 # Generate some files
1300 # ---------------------------------------------------------------------------
1301
1302 # KERNELRELEASE can change from a few different places, meaning version.h
1303 # needs to be updated, so this check is forced on all builds
1304
1305 uts_len := 64
1306 define filechk_utsrelease.h
1307         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1308           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1309           exit 1;                                                         \
1310         fi;                                                               \
1311         echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1312 endef
1313
1314 define filechk_version.h
1315         if [ $(SUBLEVEL) -gt 255 ]; then                                 \
1316                 echo \#define LINUX_VERSION_CODE $(shell                 \
1317                 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1318         else                                                             \
1319                 echo \#define LINUX_VERSION_CODE $(shell                 \
1320                 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1321         fi;                                                              \
1322         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) +  \
1323         ((c) > 255 ? 255 : (c)))';                                       \
1324         echo \#define LINUX_VERSION_MAJOR $(VERSION);                    \
1325         echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL);            \
1326         echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1327 endef
1328
1329 $(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0)
1330 $(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0)
1331 $(version_h): FORCE
1332         $(call filechk,version.h)
1333
1334 include/generated/utsrelease.h: include/config/kernel.release FORCE
1335         $(call filechk,utsrelease.h)
1336
1337 filechk_compile.h = $(srctree)/scripts/mkcompile_h \
1338         "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)"
1339
1340 include/generated/compile.h: FORCE
1341         $(call filechk,compile.h)
1342
1343 PHONY += headerdep
1344 headerdep:
1345         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1346         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1347
1348 # ---------------------------------------------------------------------------
1349 # Kernel headers
1350
1351 #Default location for installed headers
1352 export INSTALL_HDR_PATH = $(objtree)/usr
1353
1354 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1355       cmd_headers_install = \
1356         mkdir -p $(INSTALL_HDR_PATH); \
1357         rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1358         usr/include $(INSTALL_HDR_PATH)
1359
1360 PHONY += headers_install
1361 headers_install: headers
1362         $(call cmd,headers_install)
1363
1364 PHONY += archheaders archscripts
1365
1366 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1367
1368 PHONY += headers
1369 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1370         $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML))
1371         $(Q)$(MAKE) $(hdr-inst)=include/uapi
1372         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1373
1374 ifdef CONFIG_HEADERS_INSTALL
1375 prepare: headers
1376 endif
1377
1378 PHONY += scripts_unifdef
1379 scripts_unifdef: scripts_basic
1380         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1381
1382 # ---------------------------------------------------------------------------
1383 # Install
1384
1385 # Many distributions have the custom install script, /sbin/installkernel.
1386 # If DKMS is installed, 'make install' will eventually recurse back
1387 # to this Makefile to build and install external modules.
1388 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1389
1390 quiet_cmd_install = INSTALL $(INSTALL_PATH)
1391       cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh
1392
1393 # ---------------------------------------------------------------------------
1394 # Tools
1395
1396 ifdef CONFIG_OBJTOOL
1397 prepare: tools/objtool
1398 endif
1399
1400 ifdef CONFIG_BPF
1401 ifdef CONFIG_DEBUG_INFO_BTF
1402 prepare: tools/bpf/resolve_btfids
1403 endif
1404 endif
1405
1406 PHONY += resolve_btfids_clean
1407
1408 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1409
1410 # tools/bpf/resolve_btfids directory might not exist
1411 # in output directory, skip its clean in that case
1412 resolve_btfids_clean:
1413 ifneq ($(wildcard $(resolve_btfids_O)),)
1414         $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1415 endif
1416
1417 # Clear a bunch of variables before executing the submake
1418 ifeq ($(quiet),silent_)
1419 tools_silent=s
1420 endif
1421
1422 tools/: FORCE
1423         $(Q)mkdir -p $(objtree)/tools
1424         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1425
1426 tools/%: FORCE
1427         $(Q)mkdir -p $(objtree)/tools
1428         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1429
1430 # ---------------------------------------------------------------------------
1431 # Kernel selftest
1432
1433 PHONY += kselftest
1434 kselftest: headers
1435         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1436
1437 kselftest-%: headers FORCE
1438         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1439
1440 PHONY += kselftest-merge
1441 kselftest-merge:
1442         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1443         $(Q)find $(srctree)/tools/testing/selftests -name config | \
1444                 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1445         $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1446
1447 # ---------------------------------------------------------------------------
1448 # Devicetree files
1449
1450 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1451 dtstree := arch/$(SRCARCH)/boot/dts
1452 endif
1453
1454 ifneq ($(dtstree),)
1455
1456 %.dtb: dtbs_prepare
1457         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1458
1459 %.dtbo: dtbs_prepare
1460         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1461
1462 PHONY += dtbs dtbs_prepare dtbs_install dtbs_check
1463 dtbs: dtbs_prepare
1464         $(Q)$(MAKE) $(build)=$(dtstree)
1465
1466 # include/config/kernel.release is actually needed when installing DTBs because
1467 # INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make
1468 # dtbs_install depend on it as dtbs_install may run as root.
1469 dtbs_prepare: include/config/kernel.release scripts_dtc
1470
1471 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1472 export CHECK_DTBS=y
1473 endif
1474
1475 ifneq ($(CHECK_DTBS),)
1476 dtbs_prepare: dt_binding_check
1477 endif
1478
1479 dtbs_check: dtbs
1480
1481 dtbs_install:
1482         $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1483
1484 ifdef CONFIG_OF_EARLY_FLATTREE
1485 all: dtbs
1486 endif
1487
1488 endif
1489
1490 PHONY += scripts_dtc
1491 scripts_dtc: scripts_basic
1492         $(Q)$(MAKE) $(build)=scripts/dtc
1493
1494 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1495 export CHECK_DT_BINDING=y
1496 endif
1497
1498 PHONY += dt_binding_check
1499 dt_binding_check: scripts_dtc
1500         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1501
1502 PHONY += dt_compatible_check
1503 dt_compatible_check: dt_binding_check
1504         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@
1505
1506 # ---------------------------------------------------------------------------
1507 # Modules
1508
1509 ifdef CONFIG_MODULES
1510
1511 # By default, build modules as well
1512
1513 all: modules
1514
1515 # When we're building modules with modversions, we need to consider
1516 # the built-in objects during the descend as well, in order to
1517 # make sure the checksums are up to date before we record them.
1518 ifdef CONFIG_MODVERSIONS
1519   KBUILD_BUILTIN := 1
1520 endif
1521
1522 # Build modules
1523 #
1524
1525 # *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES
1526 # is an exception.
1527 ifdef CONFIG_DEBUG_INFO_BTF_MODULES
1528 KBUILD_BUILTIN := 1
1529 modules: vmlinux
1530 endif
1531
1532 modules: modules_prepare
1533
1534 # Target to prepare building external modules
1535 modules_prepare: prepare
1536         $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1537
1538 export modules_sign_only :=
1539
1540 ifeq ($(CONFIG_MODULE_SIG),y)
1541 PHONY += modules_sign
1542 modules_sign: modules_install
1543         @:
1544
1545 # modules_sign is a subset of modules_install.
1546 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1547 ifeq ($(filter modules_install,$(MAKECMDGOALS)),)
1548 modules_sign_only := y
1549 endif
1550 endif
1551
1552 endif # CONFIG_MODULES
1553
1554 modinst_pre :=
1555 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
1556 modinst_pre := __modinst_pre
1557 endif
1558
1559 modules_install: $(modinst_pre)
1560 PHONY += __modinst_pre
1561 __modinst_pre:
1562         @rm -rf $(MODLIB)/kernel
1563         @rm -f $(MODLIB)/source
1564         @mkdir -p $(MODLIB)
1565 ifdef CONFIG_MODULES
1566         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1567         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1568                 rm -f $(MODLIB)/build ; \
1569                 ln -s $(CURDIR) $(MODLIB)/build ; \
1570         fi
1571         @sed 's:^\(.*\)\.o$$:kernel/\1.ko:' modules.order > $(MODLIB)/modules.order
1572 endif
1573         @cp -f modules.builtin $(MODLIB)/
1574         @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1575
1576 ###
1577 # Cleaning is done on three levels.
1578 # make clean     Delete most generated files
1579 #                Leave enough to build external modules
1580 # make mrproper  Delete the current configuration, and all generated files
1581 # make distclean Remove editor backup files, patch leftover files and the like
1582
1583 # Directories & files removed with 'make clean'
1584 CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \
1585                modules.builtin modules.builtin.modinfo modules.nsdeps \
1586                compile_commands.json .thinlto-cache rust/test rust/doc \
1587                rust-project.json .vmlinux.objs .vmlinux.export.c
1588
1589 # Directories & files removed with 'make mrproper'
1590 MRPROPER_FILES += include/config include/generated          \
1591                   arch/$(SRCARCH)/include/generated .objdiff \
1592                   debian snap tar-install \
1593                   .config .config.old .version \
1594                   Module.symvers \
1595                   certs/signing_key.pem \
1596                   certs/x509.genkey \
1597                   vmlinux-gdb.py \
1598                   *.spec rpmbuild \
1599                   rust/libmacros.so
1600
1601 # clean - Delete most, but leave enough to build external modules
1602 #
1603 clean: rm-files := $(CLEAN_FILES)
1604
1605 PHONY += archclean vmlinuxclean
1606
1607 vmlinuxclean:
1608         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1609         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1610
1611 clean: archclean vmlinuxclean resolve_btfids_clean
1612
1613 # mrproper - Delete all generated files, including .config
1614 #
1615 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1616 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1617
1618 PHONY += $(mrproper-dirs) mrproper
1619 $(mrproper-dirs):
1620         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1621
1622 mrproper: clean $(mrproper-dirs)
1623         $(call cmd,rmfiles)
1624         @find . $(RCS_FIND_IGNORE) \
1625                 \( -name '*.rmeta' \) \
1626                 -type f -print | xargs rm -f
1627
1628 # distclean
1629 #
1630 PHONY += distclean
1631
1632 distclean: mrproper
1633         @find . $(RCS_FIND_IGNORE) \
1634                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1635                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1636                 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \
1637                 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \
1638                 -type f -print | xargs rm -f
1639
1640
1641 # Packaging of the kernel to various formats
1642 # ---------------------------------------------------------------------------
1643
1644 %src-pkg: FORCE
1645         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1646 %pkg: include/config/kernel.release FORCE
1647         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1648
1649 # Brief documentation of the typical targets used
1650 # ---------------------------------------------------------------------------
1651
1652 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1653 boards := $(sort $(notdir $(boards)))
1654 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1655 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1656
1657 PHONY += help
1658 help:
1659         @echo  'Cleaning targets:'
1660         @echo  '  clean           - Remove most generated files but keep the config and'
1661         @echo  '                    enough build support to build external modules'
1662         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1663         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1664         @echo  ''
1665         @echo  'Configuration targets:'
1666         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1667         @echo  ''
1668         @echo  'Other generic targets:'
1669         @echo  '  all             - Build all targets marked with [*]'
1670         @echo  '* vmlinux         - Build the bare kernel'
1671         @echo  '* modules         - Build all modules'
1672         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1673         @echo  '  dir/            - Build all files in dir and below'
1674         @echo  '  dir/file.[ois]  - Build specified target only'
1675         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1676         @echo  '                    (requires compiler support for LLVM assembly generation)'
1677         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1678         @echo  '                    (requires a recent binutils and recent build (System.map))'
1679         @echo  '  dir/file.ko     - Build module including final link'
1680         @echo  '  modules_prepare - Set up for building external modules'
1681         @echo  '  tags/TAGS       - Generate tags file for editors'
1682         @echo  '  cscope          - Generate cscope index'
1683         @echo  '  gtags           - Generate GNU GLOBAL index'
1684         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1685         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1686         @echo  '  image_name      - Output the image name (use with make -s)'
1687         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1688          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1689          echo  ''
1690         @echo  'Static analysers:'
1691         @echo  '  checkstack      - Generate a list of stack hogs'
1692         @echo  '  versioncheck    - Sanity check on version.h usage'
1693         @echo  '  includecheck    - Check for duplicate included header files'
1694         @echo  '  export_report   - List the usages of all exported symbols'
1695         @echo  '  headerdep       - Detect inclusion cycles in headers'
1696         @echo  '  coccicheck      - Check with Coccinelle'
1697         @echo  '  clang-analyzer  - Check with clang static analyzer'
1698         @echo  '  clang-tidy      - Check with clang-tidy'
1699         @echo  ''
1700         @echo  'Tools:'
1701         @echo  '  nsdeps          - Generate missing symbol namespace dependencies'
1702         @echo  ''
1703         @echo  'Kernel selftest:'
1704         @echo  '  kselftest         - Build and run kernel selftest'
1705         @echo  '                      Build, install, and boot kernel before'
1706         @echo  '                      running kselftest on it'
1707         @echo  '                      Run as root for full coverage'
1708         @echo  '  kselftest-all     - Build kernel selftest'
1709         @echo  '  kselftest-install - Build and install kernel selftest'
1710         @echo  '  kselftest-clean   - Remove all generated kselftest files'
1711         @echo  '  kselftest-merge   - Merge all the config dependencies of'
1712         @echo  '                      kselftest to existing .config.'
1713         @echo  ''
1714         @echo  'Rust targets:'
1715         @echo  '  rustavailable   - Checks whether the Rust toolchain is'
1716         @echo  '                    available and, if not, explains why.'
1717         @echo  '  rustfmt         - Reformat all the Rust code in the kernel'
1718         @echo  '  rustfmtcheck    - Checks if all the Rust code in the kernel'
1719         @echo  '                    is formatted, printing a diff otherwise.'
1720         @echo  '  rustdoc         - Generate Rust documentation'
1721         @echo  '                    (requires kernel .config)'
1722         @echo  '  rusttest        - Runs the Rust tests'
1723         @echo  '                    (requires kernel .config; downloads external repos)'
1724         @echo  '  rust-analyzer   - Generate rust-project.json rust-analyzer support file'
1725         @echo  '                    (requires kernel .config)'
1726         @echo  '  dir/file.[os]   - Build specified target only'
1727         @echo  '  dir/file.rsi    - Build macro expanded source, similar to C preprocessing.'
1728         @echo  '                    Run with RUSTFMT=n to skip reformatting if needed.'
1729         @echo  '                    The output is not intended to be compilable.'
1730         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1731         @echo  ''
1732         @$(if $(dtstree), \
1733                 echo 'Devicetree:'; \
1734                 echo '* dtbs             - Build device tree blobs for enabled boards'; \
1735                 echo '  dtbs_install     - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1736                 echo '  dt_binding_check - Validate device tree binding documents'; \
1737                 echo '  dtbs_check       - Validate device tree source files';\
1738                 echo '')
1739
1740         @echo 'Userspace tools targets:'
1741         @echo '  use "make tools/help"'
1742         @echo '  or  "cd tools; make help"'
1743         @echo  ''
1744         @echo  'Kernel packaging:'
1745         @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1746         @echo  ''
1747         @echo  'Documentation targets:'
1748         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1749         @echo  ''
1750         @echo  'Architecture specific targets ($(SRCARCH)):'
1751         @$(or $(archhelp),\
1752                 echo '  No architecture specific help defined for $(SRCARCH)')
1753         @echo  ''
1754         @$(if $(boards), \
1755                 $(foreach b, $(boards), \
1756                 printf "  %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1757                 echo '')
1758         @$(if $(board-dirs), \
1759                 $(foreach b, $(board-dirs), \
1760                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1761                 printf "  %-16s - Show all of the above\\n" help-boards; \
1762                 echo '')
1763
1764         @echo  '  make V=n   [targets] 1: verbose build'
1765         @echo  '                       2: give reason for rebuild of target'
1766         @echo  '                       V=1 and V=2 can be combined with V=12'
1767         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1768         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK'
1769         @echo  '                       (sparse by default)'
1770         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1771         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1772         @echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3 where'
1773         @echo  '                1: warnings which may be relevant and do not occur too often'
1774         @echo  '                2: warnings which occur quite often but may still be relevant'
1775         @echo  '                3: more obscure warnings, can most likely be ignored'
1776         @echo  '                e: warnings are being treated as errors'
1777         @echo  '                Multiple levels can be combined with W=12 or W=123'
1778         @$(if $(dtstree), \
1779                 echo '  make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \
1780                 echo '         This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \
1781                 )
1782         @echo  ''
1783         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1784         @echo  'For further info see the ./README file'
1785
1786
1787 help-board-dirs := $(addprefix help-,$(board-dirs))
1788
1789 help-boards: $(help-board-dirs)
1790
1791 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1792
1793 $(help-board-dirs): help-%:
1794         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1795         @$(if $(boards-per-dir), \
1796                 $(foreach b, $(boards-per-dir), \
1797                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1798                 echo '')
1799
1800
1801 # Documentation targets
1802 # ---------------------------------------------------------------------------
1803 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1804                linkcheckdocs dochelp refcheckdocs texinfodocs infodocs
1805 PHONY += $(DOC_TARGETS)
1806 $(DOC_TARGETS):
1807         $(Q)$(MAKE) $(build)=Documentation $@
1808
1809
1810 # Rust targets
1811 # ---------------------------------------------------------------------------
1812
1813 # "Is Rust available?" target
1814 PHONY += rustavailable
1815 rustavailable:
1816         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh -v && echo "Rust is available!"
1817
1818 # Documentation target
1819 #
1820 # Using the singular to avoid running afoul of `no-dot-config-targets`.
1821 PHONY += rustdoc
1822 rustdoc: prepare
1823         $(Q)$(MAKE) $(build)=rust $@
1824
1825 # Testing target
1826 PHONY += rusttest
1827 rusttest: prepare
1828         $(Q)$(MAKE) $(build)=rust $@
1829
1830 # Formatting targets
1831 PHONY += rustfmt rustfmtcheck
1832
1833 # We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream.
1834 #
1835 # We match using absolute paths since `find` does not resolve them
1836 # when matching, which is a problem when e.g. `srctree` is `..`.
1837 # We `grep` afterwards in order to remove the directory entry itself.
1838 rustfmt:
1839         $(Q)find $(abs_srctree) -type f -name '*.rs' \
1840                 -o -path $(abs_srctree)/rust/alloc -prune \
1841                 -o -path $(abs_objtree)/rust/test -prune \
1842                 | grep -Fv $(abs_srctree)/rust/alloc \
1843                 | grep -Fv $(abs_objtree)/rust/test \
1844                 | grep -Fv generated \
1845                 | xargs $(RUSTFMT) $(rustfmt_flags)
1846
1847 rustfmtcheck: rustfmt_flags = --check
1848 rustfmtcheck: rustfmt
1849
1850 # IDE support targets
1851 PHONY += rust-analyzer
1852 rust-analyzer:
1853         $(Q)$(MAKE) $(build)=rust $@
1854
1855 # Misc
1856 # ---------------------------------------------------------------------------
1857
1858 PHONY += misc-check
1859 misc-check:
1860         $(Q)$(srctree)/scripts/misc-check
1861
1862 all: misc-check
1863
1864 PHONY += scripts_gdb
1865 scripts_gdb: prepare0
1866         $(Q)$(MAKE) $(build)=scripts/gdb
1867         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1868
1869 ifdef CONFIG_GDB_SCRIPTS
1870 all: scripts_gdb
1871 endif
1872
1873 else # KBUILD_EXTMOD
1874
1875 filechk_kernel.release = echo $(KERNELRELEASE)
1876
1877 ###
1878 # External module support.
1879 # When building external modules the kernel used as basis is considered
1880 # read-only, and no consistency checks are made and the make
1881 # system is not used on the basis kernel. If updates are required
1882 # in the basis kernel ordinary make commands (without M=...) must be used.
1883
1884 # We are always building only modules.
1885 KBUILD_BUILTIN :=
1886 KBUILD_MODULES := 1
1887
1888 build-dir := $(KBUILD_EXTMOD)
1889
1890 compile_commands.json: $(extmod_prefix)compile_commands.json
1891 PHONY += compile_commands.json
1892
1893 clean-dirs := $(KBUILD_EXTMOD)
1894 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1895         $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache
1896
1897 PHONY += prepare
1898 # now expand this into a simple variable to reduce the cost of shell evaluations
1899 prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT)
1900 prepare:
1901         @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \
1902                 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \
1903                 echo >&2 "  The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \
1904                 echo >&2 "  You are using:           $(CC_VERSION_TEXT)"; \
1905         fi
1906
1907 PHONY += help
1908 help:
1909         @echo  '  Building external modules.'
1910         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1911         @echo  ''
1912         @echo  '  modules         - default target, build the module(s)'
1913         @echo  '  modules_install - install the module'
1914         @echo  '  clean           - remove generated files in module directory only'
1915         @echo  ''
1916
1917 __external_modules_error:
1918         @echo >&2 '***'
1919         @echo >&2 '*** The present kernel disabled CONFIG_MODULES.'
1920         @echo >&2 '*** You cannot build or install external modules.'
1921         @echo >&2 '***'
1922         @false
1923
1924 endif # KBUILD_EXTMOD
1925
1926 # ---------------------------------------------------------------------------
1927 # Modules
1928
1929 PHONY += modules modules_install modules_prepare
1930
1931 ifdef CONFIG_MODULES
1932
1933 $(MODORDER): $(build-dir)
1934         @:
1935
1936 # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
1937 # This is solely useful to speed up test compiles.
1938 modules: modpost
1939 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
1940         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
1941 endif
1942
1943 PHONY += modules_check
1944 modules_check: $(MODORDER)
1945         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1946
1947 quiet_cmd_depmod = DEPMOD  $(MODLIB)
1948       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1949                    $(KERNELRELEASE)
1950
1951 modules_install:
1952         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1953         $(call cmd,depmod)
1954
1955 else # CONFIG_MODULES
1956
1957 # Modules not configured
1958 # ---------------------------------------------------------------------------
1959
1960 PHONY += __external_modules_error
1961
1962 modules modules_install: __external_modules_error
1963         @:
1964
1965 KBUILD_MODULES :=
1966
1967 endif # CONFIG_MODULES
1968
1969 PHONY += modpost
1970 modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \
1971          $(if $(KBUILD_MODULES), modules_check)
1972         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1973
1974 # Single targets
1975 # ---------------------------------------------------------------------------
1976 # To build individual files in subdirectories, you can do like this:
1977 #
1978 #   make foo/bar/baz.s
1979 #
1980 # The supported suffixes for single-target are listed in 'single-targets'
1981 #
1982 # To build only under specific subdirectories, you can do like this:
1983 #
1984 #   make foo/bar/baz/
1985
1986 ifdef single-build
1987
1988 # .ko is special because modpost is needed
1989 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1990 single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \
1991                 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko)))
1992
1993 $(single-ko): single_modules
1994         @:
1995 $(single-no-ko): $(build-dir)
1996         @:
1997
1998 # Remove MODORDER when done because it is not the real one.
1999 PHONY += single_modules
2000 single_modules: $(single-no-ko) modules_prepare
2001         $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER)
2002         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
2003 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
2004         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
2005 endif
2006         $(Q)rm -f $(MODORDER)
2007
2008 single-goals := $(addprefix $(build-dir)/, $(single-no-ko))
2009
2010 KBUILD_MODULES := 1
2011
2012 endif
2013
2014 # Preset locale variables to speed up the build process. Limit locale
2015 # tweaks to this spot to avoid wrong language settings when running
2016 # make menuconfig etc.
2017 # Error messages still appears in the original language
2018 PHONY += $(build-dir)
2019 $(build-dir): prepare
2020         $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals)
2021
2022 clean-dirs := $(addprefix _clean_, $(clean-dirs))
2023 PHONY += $(clean-dirs) clean
2024 $(clean-dirs):
2025         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
2026
2027 clean: $(clean-dirs)
2028         $(call cmd,rmfiles)
2029         @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
2030                 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \
2031                 -o -name '*.ko.*' \
2032                 -o -name '*.dtb' -o -name '*.dtbo' \
2033                 -o -name '*.dtb.S' -o -name '*.dtbo.S' \
2034                 -o -name '*.dt.yaml' \
2035                 -o -name '*.dwo' -o -name '*.lst' \
2036                 -o -name '*.su' -o -name '*.mod' \
2037                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
2038                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
2039                 -o -name '*.asn1.[ch]' \
2040                 -o -name '*.symtypes' -o -name 'modules.order' \
2041                 -o -name '*.c.[012]*.*' \
2042                 -o -name '*.ll' \
2043                 -o -name '*.gcno' \
2044                 -o -name '*.*.symversions' \) -type f -print \
2045                 -o -name '.tmp_*' -print \
2046                 | xargs rm -rf
2047
2048 # Generate tags for editors
2049 # ---------------------------------------------------------------------------
2050 quiet_cmd_tags = GEN     $@
2051       cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
2052
2053 tags TAGS cscope gtags: FORCE
2054         $(call cmd,tags)
2055
2056 # Script to generate missing namespace dependencies
2057 # ---------------------------------------------------------------------------
2058
2059 PHONY += nsdeps
2060 nsdeps: export KBUILD_NSDEPS=1
2061 nsdeps: modules
2062         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
2063
2064 # Clang Tooling
2065 # ---------------------------------------------------------------------------
2066
2067 quiet_cmd_gen_compile_commands = GEN     $@
2068       cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
2069
2070 $(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
2071         $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \
2072         $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
2073         $(call if_changed,gen_compile_commands)
2074
2075 targets += $(extmod_prefix)compile_commands.json
2076
2077 PHONY += clang-tidy clang-analyzer
2078
2079 ifdef CONFIG_CC_IS_CLANG
2080 quiet_cmd_clang_tools = CHECK   $<
2081       cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
2082
2083 clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json
2084         $(call cmd,clang_tools)
2085 else
2086 clang-tidy clang-analyzer:
2087         @echo "$@ requires CC=clang" >&2
2088         @false
2089 endif
2090
2091 # Scripts to check various things for consistency
2092 # ---------------------------------------------------------------------------
2093
2094 PHONY += includecheck versioncheck coccicheck export_report
2095
2096 includecheck:
2097         find $(srctree)/* $(RCS_FIND_IGNORE) \
2098                 -name '*.[hcS]' -type f -print | sort \
2099                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
2100
2101 versioncheck:
2102         find $(srctree)/* $(RCS_FIND_IGNORE) \
2103                 -name '*.[hcS]' -type f -print | sort \
2104                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
2105
2106 coccicheck:
2107         $(Q)$(BASH) $(srctree)/scripts/$@
2108
2109 export_report:
2110         $(PERL) $(srctree)/scripts/export_report.pl
2111
2112 PHONY += checkstack kernelrelease kernelversion image_name
2113
2114 # UML needs a little special treatment here.  It wants to use the host
2115 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
2116 # else wants $(ARCH), including people doing cross-builds, which means
2117 # that $(SUBARCH) doesn't work here.
2118 ifeq ($(ARCH), um)
2119 CHECKSTACK_ARCH := $(SUBARCH)
2120 else
2121 CHECKSTACK_ARCH := $(ARCH)
2122 endif
2123 checkstack:
2124         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
2125         $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
2126
2127 kernelrelease:
2128         @$(filechk_kernel.release)
2129
2130 kernelversion:
2131         @echo $(KERNELVERSION)
2132
2133 image_name:
2134         @echo $(KBUILD_IMAGE)
2135
2136 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
2137       cmd_rmfiles = rm -rf $(rm-files)
2138
2139 # read saved command lines for existing targets
2140 existing-targets := $(wildcard $(sort $(targets)))
2141
2142 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
2143
2144 endif # config-build
2145 endif # mixed-build
2146 endif # need-sub-make
2147
2148 PHONY += FORCE
2149 FORCE:
2150
2151 # Declare the contents of the PHONY variable as phony.  We keep that
2152 # information in a variable so we can use it in if_changed and friends.
2153 .PHONY: $(PHONY)