1 # SPDX-License-Identifier: GPL-2.0 2 VERSION = 5 3 PATCHLEVEL = 16 4 SUBLEVEL = 0 5 EXTRAVERSION = 6 NAME = Gobble Gobble 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 $(if $(filter __%, $(MAKECMDGOALS)), \ 15 $(error targets prefixed with '__' are only for internal use)) 16 17 # That's our default target when none is given on the command line 18 PHONY := __all 19 __all: 20 21 # We are using a recursive build, so we need to do a little thinking 22 # to get the ordering right. 23 # 24 # Most importantly: sub-Makefiles should only ever modify files in 25 # their own directory. If in some directory we have a dependency on 26 # a file in another dir (which doesn't happen often, but it's often 27 # unavoidable when linking the built-in.a targets which finally 28 # turn into vmlinux), we will call a sub make in that other dir, and 29 # after that we are sure that everything which is in that other dir 30 # is now up to date. 31 # 32 # The only cases where we need to modify files which have global 33 # effects are thus separated out and done before the recursive 34 # descending is started. They are now explicitly listed as the 35 # prepare rule. 36 37 ifneq ($(sub_make_done),1) 38 39 # Do not use make's built-in rules and variables 40 # (this increases performance and avoids hard-to-debug behaviour) 41 MAKEFLAGS += -rR 42 43 # Avoid funny character set dependencies 44 unexport LC_ALL 45 LC_COLLATE=C 46 LC_NUMERIC=C 47 export LC_COLLATE LC_NUMERIC 48 49 # Avoid interference with shell env settings 50 unexport GREP_OPTIONS 51 52 # Beautify output 53 # --------------------------------------------------------------------------- 54 # 55 # Normally, we echo the whole command before executing it. By making 56 # that echo $($(quiet)$(cmd)), we now have the possibility to set 57 # $(quiet) to choose other forms of output instead, e.g. 58 # 59 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 60 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 61 # 62 # If $(quiet) is empty, the whole command will be printed. 63 # If it is set to "quiet_", only the short version will be printed. 64 # If it is set to "silent_", nothing will be printed at all, since 65 # the variable $(silent_cmd_cc_o_c) doesn't exist. 66 # 67 # A simple variant is to prefix commands with $(Q) - that's useful 68 # for commands that shall be hidden in non-verbose mode. 69 # 70 # $(Q)ln $@ :< 71 # 72 # If KBUILD_VERBOSE equals 0 then the above command will be hidden. 73 # If KBUILD_VERBOSE equals 1 then the above command is displayed. 74 # If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt. 75 # 76 # To put more focus on warnings, be less verbose as default 77 # Use 'make V=1' to see the full commands 78 79 ifeq ("$(origin V)", "command line") 80 KBUILD_VERBOSE = $(V) 81 endif 82 ifndef KBUILD_VERBOSE 83 KBUILD_VERBOSE = 0 84 endif 85 86 ifeq ($(KBUILD_VERBOSE),1) 87 quiet = 88 Q = 89 else 90 quiet=quiet_ 91 Q = @ 92 endif 93 94 # If the user is running make -s (silent mode), suppress echoing of 95 # commands 96 97 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 98 quiet=silent_ 99 KBUILD_VERBOSE = 0 100 endif 101 102 export quiet Q KBUILD_VERBOSE 103 104 # Call a source code checker (by default, "sparse") as part of the 105 # C compilation. 106 # 107 # Use 'make C=1' to enable checking of only re-compiled files. 108 # Use 'make C=2' to enable checking of *all* source files, regardless 109 # of whether they are re-compiled or not. 110 # 111 # See the file "Documentation/dev-tools/sparse.rst" for more details, 112 # including where to get the "sparse" utility. 113 114 ifeq ("$(origin C)", "command line") 115 KBUILD_CHECKSRC = $(C) 116 endif 117 ifndef KBUILD_CHECKSRC 118 KBUILD_CHECKSRC = 0 119 endif 120 121 export KBUILD_CHECKSRC 122 123 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 124 # directory of external module to build. Setting M= takes precedence. 125 ifeq ("$(origin M)", "command line") 126 KBUILD_EXTMOD := $(M) 127 endif 128 129 $(if $(word 2, $(KBUILD_EXTMOD)), \ 130 $(error building multiple external modules is not supported)) 131 132 # Remove trailing slashes 133 ifneq ($(filter %/, $(KBUILD_EXTMOD)),) 134 KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) 135 endif 136 137 export KBUILD_EXTMOD 138 139 # Kbuild will save output files in the current working directory. 140 # This does not need to match to the root of the kernel source tree. 141 # 142 # For example, you can do this: 143 # 144 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 145 # 146 # If you want to save output files in a different location, there are 147 # two syntaxes to specify it. 148 # 149 # 1) O= 150 # Use "make O=dir/to/store/output/files/" 151 # 152 # 2) Set KBUILD_OUTPUT 153 # Set the environment variable KBUILD_OUTPUT to point to the output directory. 154 # export KBUILD_OUTPUT=dir/to/store/output/files/; make 155 # 156 # The O= assignment takes precedence over the KBUILD_OUTPUT environment 157 # variable. 158 159 # Do we want to change the working directory? 160 ifeq ("$(origin O)", "command line") 161 KBUILD_OUTPUT := $(O) 162 endif 163 164 ifneq ($(KBUILD_OUTPUT),) 165 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 166 # expand a shell special character '~'. We use a somewhat tedious way here. 167 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 168 $(if $(abs_objtree),, \ 169 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 170 171 # $(realpath ...) resolves symlinks 172 abs_objtree := $(realpath $(abs_objtree)) 173 else 174 abs_objtree := $(CURDIR) 175 endif # ifneq ($(KBUILD_OUTPUT),) 176 177 ifeq ($(abs_objtree),$(CURDIR)) 178 # Suppress "Entering directory ..." unless we are changing the work directory. 179 MAKEFLAGS += --no-print-directory 180 else 181 need-sub-make := 1 182 endif 183 184 this-makefile := $(lastword $(MAKEFILE_LIST)) 185 abs_srctree := $(realpath $(dir $(this-makefile))) 186 187 ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 188 $(error source directory cannot contain spaces or colons) 189 endif 190 191 ifneq ($(abs_srctree),$(abs_objtree)) 192 # Look for make include files relative to root of kernel src 193 # 194 # --included-dir is added for backward compatibility, but you should not rely on 195 # it. Please add $(srctree)/ prefix to include Makefiles in the source tree. 196 MAKEFLAGS += --include-dir=$(abs_srctree) 197 endif 198 199 ifneq ($(filter 3.%,$(MAKE_VERSION)),) 200 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 201 # We need to invoke sub-make to avoid implicit rules in the top Makefile. 202 need-sub-make := 1 203 # Cancel implicit rules for this Makefile. 204 $(this-makefile): ; 205 endif 206 207 export abs_srctree abs_objtree 208 export sub_make_done := 1 209 210 ifeq ($(need-sub-make),1) 211 212 PHONY += $(MAKECMDGOALS) __sub-make 213 214 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 215 @: 216 217 # Invoke a second make in the output directory, passing relevant variables 218 __sub-make: 219 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 220 221 endif # need-sub-make 222 endif # sub_make_done 223 224 # We process the rest of the Makefile if this is the final invocation of make 225 ifeq ($(need-sub-make),) 226 227 # Do not print "Entering directory ...", 228 # but we want to display it when entering to the output directory 229 # so that IDEs/editors are able to understand relative filenames. 230 MAKEFLAGS += --no-print-directory 231 232 ifeq ($(abs_srctree),$(abs_objtree)) 233 # building in the source tree 234 srctree := . 235 building_out_of_srctree := 236 else 237 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 238 # building in a subdirectory of the source tree 239 srctree := .. 240 else 241 srctree := $(abs_srctree) 242 endif 243 building_out_of_srctree := 1 244 endif 245 246 ifneq ($(KBUILD_ABS_SRCTREE),) 247 srctree := $(abs_srctree) 248 endif 249 250 objtree := . 251 VPATH := $(srctree) 252 253 export building_out_of_srctree srctree objtree VPATH 254 255 # To make sure we do not include .config for any of the *config targets 256 # catch them early, and hand them over to scripts/kconfig/Makefile 257 # It is allowed to specify more targets when calling make, including 258 # mixing *config targets and build targets. 259 # For example 'make oldconfig all'. 260 # Detect when mixed targets is specified, and make a second invocation 261 # of make so .config is not included in this case either (for *config). 262 263 version_h := include/generated/uapi/linux/version.h 264 265 clean-targets := %clean mrproper cleandocs 266 no-dot-config-targets := $(clean-targets) \ 267 cscope gtags TAGS tags help% %docs check% coccicheck \ 268 $(version_h) headers headers_% archheaders archscripts \ 269 %asm-generic kernelversion %src-pkg dt_binding_check \ 270 outputmakefile 271 # Installation targets should not require compiler. Unfortunately, vdso_install 272 # is an exception where build artifacts may be updated. This must be fixed. 273 no-compiler-targets := $(no-dot-config-targets) install dtbs_install \ 274 headers_install modules_install kernelrelease image_name 275 no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \ 276 image_name 277 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ 278 279 config-build := 280 mixed-build := 281 need-config := 1 282 need-compiler := 1 283 may-sync-config := 1 284 single-build := 285 286 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 287 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 288 need-config := 289 endif 290 endif 291 292 ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),) 293 ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),) 294 need-compiler := 295 endif 296 endif 297 298 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 299 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 300 may-sync-config := 301 endif 302 endif 303 304 ifneq ($(KBUILD_EXTMOD),) 305 may-sync-config := 306 endif 307 308 ifeq ($(KBUILD_EXTMOD),) 309 ifneq ($(filter %config,$(MAKECMDGOALS)),) 310 config-build := 1 311 ifneq ($(words $(MAKECMDGOALS)),1) 312 mixed-build := 1 313 endif 314 endif 315 endif 316 317 # We cannot build single targets and the others at the same time 318 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 319 single-build := 1 320 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 321 mixed-build := 1 322 endif 323 endif 324 325 # For "make -j clean all", "make -j mrproper defconfig all", etc. 326 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 327 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 328 mixed-build := 1 329 endif 330 endif 331 332 # install and modules_install need also be processed one by one 333 ifneq ($(filter install,$(MAKECMDGOALS)),) 334 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 335 mixed-build := 1 336 endif 337 endif 338 339 ifdef mixed-build 340 # =========================================================================== 341 # We're called with mixed targets (*config and build targets). 342 # Handle them one by one. 343 344 PHONY += $(MAKECMDGOALS) __build_one_by_one 345 346 $(MAKECMDGOALS): __build_one_by_one 347 @: 348 349 __build_one_by_one: 350 $(Q)set -e; \ 351 for i in $(MAKECMDGOALS); do \ 352 $(MAKE) -f $(srctree)/Makefile $$i; \ 353 done 354 355 else # !mixed-build 356 357 include $(srctree)/scripts/Kbuild.include 358 359 # Read KERNELRELEASE from include/config/kernel.release (if it exists) 360 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 361 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 362 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 363 364 include $(srctree)/scripts/subarch.include 365 366 # Cross compiling and selecting different set of gcc/bin-utils 367 # --------------------------------------------------------------------------- 368 # 369 # When performing cross compilation for other architectures ARCH shall be set 370 # to the target architecture. (See arch/* for the possibilities). 371 # ARCH can be set during invocation of make: 372 # make ARCH=ia64 373 # Another way is to have ARCH set in the environment. 374 # The default ARCH is the host where make is executed. 375 376 # CROSS_COMPILE specify the prefix used for all executables used 377 # during compilation. Only gcc and related bin-utils executables 378 # are prefixed with $(CROSS_COMPILE). 379 # CROSS_COMPILE can be set on the command line 380 # make CROSS_COMPILE=ia64-linux- 381 # Alternatively CROSS_COMPILE can be set in the environment. 382 # Default value for CROSS_COMPILE is not to prefix executables 383 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 384 ARCH ?= $(SUBARCH) 385 386 # Architecture as present in compile.h 387 UTS_MACHINE := $(ARCH) 388 SRCARCH := $(ARCH) 389 390 # Additional ARCH settings for x86 391 ifeq ($(ARCH),i386) 392 SRCARCH := x86 393 endif 394 ifeq ($(ARCH),x86_64) 395 SRCARCH := x86 396 endif 397 398 # Additional ARCH settings for sparc 399 ifeq ($(ARCH),sparc32) 400 SRCARCH := sparc 401 endif 402 ifeq ($(ARCH),sparc64) 403 SRCARCH := sparc 404 endif 405 406 # Additional ARCH settings for parisc 407 ifeq ($(ARCH),parisc64) 408 SRCARCH := parisc 409 endif 410 411 export cross_compiling := 412 ifneq ($(SRCARCH),$(SUBARCH)) 413 cross_compiling := 1 414 endif 415 416 KCONFIG_CONFIG ?= .config 417 export KCONFIG_CONFIG 418 419 # SHELL used by kbuild 420 CONFIG_SHELL := sh 421 422 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 423 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 424 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 425 426 ifneq ($(LLVM),) 427 HOSTCC = clang 428 HOSTCXX = clang++ 429 else 430 HOSTCC = gcc 431 HOSTCXX = g++ 432 endif 433 434 export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 435 -O2 -fomit-frame-pointer -std=gnu89 436 export KBUILD_USERLDFLAGS := 437 438 KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 439 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 440 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 441 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 442 443 # Make variables (CC, etc...) 444 CPP = $(CC) -E 445 ifneq ($(LLVM),) 446 CC = clang 447 LD = ld.lld 448 AR = llvm-ar 449 NM = llvm-nm 450 OBJCOPY = llvm-objcopy 451 OBJDUMP = llvm-objdump 452 READELF = llvm-readelf 453 STRIP = llvm-strip 454 else 455 CC = $(CROSS_COMPILE)gcc 456 LD = $(CROSS_COMPILE)ld 457 AR = $(CROSS_COMPILE)ar 458 NM = $(CROSS_COMPILE)nm 459 OBJCOPY = $(CROSS_COMPILE)objcopy 460 OBJDUMP = $(CROSS_COMPILE)objdump 461 READELF = $(CROSS_COMPILE)readelf 462 STRIP = $(CROSS_COMPILE)strip 463 endif 464 PAHOLE = pahole 465 RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 466 LEX = flex 467 YACC = bison 468 AWK = awk 469 INSTALLKERNEL := installkernel 470 DEPMOD = depmod 471 PERL = perl 472 PYTHON3 = python3 473 CHECK = sparse 474 BASH = bash 475 KGZIP = gzip 476 KBZIP2 = bzip2 477 KLZOP = lzop 478 LZMA = lzma 479 LZ4 = lz4c 480 XZ = xz 481 ZSTD = zstd 482 483 PAHOLE_FLAGS = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh) 484 485 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 486 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 487 NOSTDINC_FLAGS := 488 CFLAGS_MODULE = 489 AFLAGS_MODULE = 490 LDFLAGS_MODULE = 491 CFLAGS_KERNEL = 492 AFLAGS_KERNEL = 493 LDFLAGS_vmlinux = 494 495 # Use USERINCLUDE when you must reference the UAPI directories only. 496 USERINCLUDE := \ 497 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 498 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 499 -I$(srctree)/include/uapi \ 500 -I$(objtree)/include/generated/uapi \ 501 -include $(srctree)/include/linux/compiler-version.h \ 502 -include $(srctree)/include/linux/kconfig.h 503 504 # Use LINUXINCLUDE when you must reference the include/ directory. 505 # Needed to be compatible with the O= option 506 LINUXINCLUDE := \ 507 -I$(srctree)/arch/$(SRCARCH)/include \ 508 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 509 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 510 -I$(objtree)/include \ 511 $(USERINCLUDE) 512 513 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 514 KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 515 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 516 -Werror=implicit-function-declaration -Werror=implicit-int \ 517 -Werror=return-type -Wno-format-security \ 518 -std=gnu89 519 KBUILD_CPPFLAGS := -D__KERNEL__ 520 KBUILD_AFLAGS_KERNEL := 521 KBUILD_CFLAGS_KERNEL := 522 KBUILD_AFLAGS_MODULE := -DMODULE 523 KBUILD_CFLAGS_MODULE := -DMODULE 524 KBUILD_LDFLAGS_MODULE := 525 KBUILD_LDFLAGS := 526 CLANG_FLAGS := 527 528 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 529 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 530 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 531 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 532 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 533 534 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 535 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 536 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 537 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 538 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 539 export PAHOLE_FLAGS 540 541 # Files to ignore in find ... statements 542 543 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 544 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 545 -prune -o 546 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 547 --exclude CVS --exclude .pc --exclude .hg --exclude .git 548 549 # =========================================================================== 550 # Rules shared between *config targets and build targets 551 552 # Basic helpers built in scripts/basic/ 553 PHONY += scripts_basic 554 scripts_basic: 555 $(Q)$(MAKE) $(build)=scripts/basic 556 557 PHONY += outputmakefile 558 ifdef building_out_of_srctree 559 # Before starting out-of-tree build, make sure the source tree is clean. 560 # outputmakefile generates a Makefile in the output directory, if using a 561 # separate output directory. This allows convenient use of make in the 562 # output directory. 563 # At the same time when output Makefile generated, generate .gitignore to 564 # ignore whole output directory 565 566 quiet_cmd_makefile = GEN Makefile 567 cmd_makefile = { \ 568 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 569 echo "include $(srctree)/Makefile"; \ 570 } > Makefile 571 572 outputmakefile: 573 $(Q)if [ -f $(srctree)/.config -o \ 574 -d $(srctree)/include/config -o \ 575 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 576 echo >&2 "***"; \ 577 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 578 echo >&2 "*** in $(abs_srctree)";\ 579 echo >&2 "***"; \ 580 false; \ 581 fi 582 $(Q)ln -fsn $(srctree) source 583 $(call cmd,makefile) 584 $(Q)test -e .gitignore || \ 585 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 586 endif 587 588 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 589 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 590 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 591 # and from include/config/auto.conf.cmd to detect the compiler upgrade. 592 CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 593 594 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 595 include $(srctree)/scripts/Makefile.clang 596 endif 597 598 # Include this also for config targets because some architectures need 599 # cc-cross-prefix to determine CROSS_COMPILE. 600 ifdef need-compiler 601 include $(srctree)/scripts/Makefile.compiler 602 endif 603 604 ifdef config-build 605 # =========================================================================== 606 # *config targets only - make sure prerequisites are updated, and descend 607 # in scripts/kconfig to make the *config target 608 609 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 610 # KBUILD_DEFCONFIG may point out an alternative default configuration 611 # used for 'make defconfig' 612 include $(srctree)/arch/$(SRCARCH)/Makefile 613 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 614 615 config: outputmakefile scripts_basic FORCE 616 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 617 618 %config: outputmakefile scripts_basic FORCE 619 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 620 621 else #!config-build 622 # =========================================================================== 623 # Build targets only - this includes vmlinux, arch specific targets, clean 624 # targets and others. In general all targets except *config targets. 625 626 # If building an external module we do not care about the all: rule 627 # but instead __all depend on modules 628 PHONY += all 629 ifeq ($(KBUILD_EXTMOD),) 630 __all: all 631 else 632 __all: modules 633 endif 634 635 # Decide whether to build built-in, modular, or both. 636 # Normally, just do built-in. 637 638 KBUILD_MODULES := 639 KBUILD_BUILTIN := 1 640 641 # If we have only "make modules", don't compile built-in objects. 642 ifeq ($(MAKECMDGOALS),modules) 643 KBUILD_BUILTIN := 644 endif 645 646 # If we have "make <whatever> modules", compile modules 647 # in addition to whatever we do anyway. 648 # Just "make" or "make all" shall build modules as well 649 650 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 651 KBUILD_MODULES := 1 652 endif 653 654 ifeq ($(MAKECMDGOALS),) 655 KBUILD_MODULES := 1 656 endif 657 658 export KBUILD_MODULES KBUILD_BUILTIN 659 660 ifdef need-config 661 include include/config/auto.conf 662 endif 663 664 ifeq ($(KBUILD_EXTMOD),) 665 # Objects we will link into vmlinux / subdirs we need to visit 666 core-y := init/ usr/ arch/$(SRCARCH)/ 667 drivers-y := drivers/ sound/ 668 drivers-$(CONFIG_SAMPLES) += samples/ 669 drivers-$(CONFIG_NET) += net/ 670 drivers-y += virt/ 671 libs-y := lib/ 672 endif # KBUILD_EXTMOD 673 674 # The all: target is the default when no target is given on the 675 # command line. 676 # This allow a user to issue only 'make' to build a kernel including modules 677 # Defaults to vmlinux, but the arch makefile usually adds further targets 678 all: vmlinux 679 680 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 681 ifdef CONFIG_CC_IS_GCC 682 CFLAGS_GCOV += -fno-tree-loop-im 683 endif 684 export CFLAGS_GCOV 685 686 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 687 ifdef CONFIG_FUNCTION_TRACER 688 CC_FLAGS_FTRACE := -pg 689 endif 690 691 ifdef CONFIG_CC_IS_GCC 692 RETPOLINE_CFLAGS := $(call cc-option,-mindirect-branch=thunk-extern -mindirect-branch-register) 693 RETPOLINE_VDSO_CFLAGS := $(call cc-option,-mindirect-branch=thunk-inline -mindirect-branch-register) 694 endif 695 ifdef CONFIG_CC_IS_CLANG 696 RETPOLINE_CFLAGS := -mretpoline-external-thunk 697 RETPOLINE_VDSO_CFLAGS := -mretpoline 698 endif 699 export RETPOLINE_CFLAGS 700 export RETPOLINE_VDSO_CFLAGS 701 702 include $(srctree)/arch/$(SRCARCH)/Makefile 703 704 ifdef need-config 705 ifdef may-sync-config 706 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if 707 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile 708 # because some architectures define CROSS_COMPILE there. 709 include include/config/auto.conf.cmd 710 711 $(KCONFIG_CONFIG): 712 @echo >&2 '***' 713 @echo >&2 '*** Configuration file "$@" not found!' 714 @echo >&2 '***' 715 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 716 @echo >&2 '*** "make menuconfig" or "make xconfig").' 717 @echo >&2 '***' 718 @/bin/false 719 720 # The actual configuration files used during the build are stored in 721 # include/generated/ and include/config/. Update them if .config is newer than 722 # include/config/auto.conf (which mirrors .config). 723 # 724 # This exploits the 'multi-target pattern rule' trick. 725 # The syncconfig should be executed only once to make all the targets. 726 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 727 # 728 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 729 # so you cannot notice that Kconfig is waiting for the user input. 730 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 731 $(Q)$(kecho) " SYNC $@" 732 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 733 else # !may-sync-config 734 # External modules and some install targets need include/generated/autoconf.h 735 # and include/config/auto.conf but do not care if they are up-to-date. 736 # Use auto.conf to trigger the test 737 PHONY += include/config/auto.conf 738 739 include/config/auto.conf: 740 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 741 echo >&2; \ 742 echo >&2 " ERROR: Kernel configuration is invalid."; \ 743 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 744 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 745 echo >&2 ; \ 746 /bin/false) 747 748 endif # may-sync-config 749 endif # need-config 750 751 KBUILD_CFLAGS += -fno-delete-null-pointer-checks 752 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 753 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 754 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 755 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 756 757 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 758 KBUILD_CFLAGS += -O2 759 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 760 KBUILD_CFLAGS += -O3 761 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 762 KBUILD_CFLAGS += -Os 763 endif 764 765 # Tell gcc to never replace conditional load with a non-conditional one 766 ifdef CONFIG_CC_IS_GCC 767 # gcc-10 renamed --param=allow-store-data-races=0 to 768 # -fno-allow-store-data-races. 769 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 770 KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 771 endif 772 773 ifdef CONFIG_READABLE_ASM 774 # Disable optimizations that make assembler listings hard to read. 775 # reorder blocks reorders the control in the function 776 # ipa clone creates specialized cloned functions 777 # partial inlining inlines only parts of functions 778 KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 779 endif 780 781 ifneq ($(CONFIG_FRAME_WARN),0) 782 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 783 endif 784 785 stackp-flags-y := -fno-stack-protector 786 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 787 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 788 789 KBUILD_CFLAGS += $(stackp-flags-y) 790 791 KBUILD_CFLAGS-$(CONFIG_WERROR) += -Werror 792 KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH:"%"=%) 793 794 ifdef CONFIG_CC_IS_CLANG 795 KBUILD_CPPFLAGS += -Qunused-arguments 796 # The kernel builds with '-std=gnu89' so use of GNU extensions is acceptable. 797 KBUILD_CFLAGS += -Wno-gnu 798 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 799 # source of a reference will be _MergedGlobals and not on of the whitelisted names. 800 # See modpost pattern 2 801 KBUILD_CFLAGS += -mno-global-merge 802 else 803 804 # gcc inanely warns about local variables called 'main' 805 KBUILD_CFLAGS += -Wno-main 806 endif 807 808 # These warnings generated too much noise in a regular build. 809 # Use make W=1 to enable them (see scripts/Makefile.extrawarn) 810 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 811 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 812 813 ifdef CONFIG_FRAME_POINTER 814 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 815 else 816 # Some targets (ARM with Thumb2, for example), can't be built with frame 817 # pointers. For those, we don't have FUNCTION_TRACER automatically 818 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 819 # incompatible with -fomit-frame-pointer with current GCC, so we don't use 820 # -fomit-frame-pointer with FUNCTION_TRACER. 821 ifndef CONFIG_FUNCTION_TRACER 822 KBUILD_CFLAGS += -fomit-frame-pointer 823 endif 824 endif 825 826 # Initialize all stack variables with a 0xAA pattern. 827 ifdef CONFIG_INIT_STACK_ALL_PATTERN 828 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 829 endif 830 831 # Initialize all stack variables with a zero value. 832 ifdef CONFIG_INIT_STACK_ALL_ZERO 833 KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 834 ifdef CONFIG_CC_IS_CLANG 835 # https://bugs.llvm.org/show_bug.cgi?id=45497 836 KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 837 endif 838 endif 839 840 # While VLAs have been removed, GCC produces unreachable stack probes 841 # for the randomize_kstack_offset feature. Disable it for all compilers. 842 KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 843 844 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 845 ifdef CONFIG_ZERO_CALL_USED_REGS 846 KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 847 endif 848 849 ifdef CONFIG_FUNCTION_TRACER 850 ifdef CONFIG_FTRACE_MCOUNT_USE_CC 851 CC_FLAGS_FTRACE += -mrecord-mcount 852 ifdef CONFIG_HAVE_NOP_MCOUNT 853 ifeq ($(call cc-option-yn, -mnop-mcount),y) 854 CC_FLAGS_FTRACE += -mnop-mcount 855 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 856 endif 857 endif 858 endif 859 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 860 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 861 endif 862 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 863 ifdef CONFIG_HAVE_C_RECORDMCOUNT 864 BUILD_C_RECORDMCOUNT := y 865 export BUILD_C_RECORDMCOUNT 866 endif 867 endif 868 ifdef CONFIG_HAVE_FENTRY 869 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 870 ifeq ($(call cc-option-yn, -mfentry),y) 871 CC_FLAGS_FTRACE += -mfentry 872 CC_FLAGS_USING += -DCC_USING_FENTRY 873 endif 874 endif 875 export CC_FLAGS_FTRACE 876 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 877 KBUILD_AFLAGS += $(CC_FLAGS_USING) 878 endif 879 880 # We trigger additional mismatches with less inlining 881 ifdef CONFIG_DEBUG_SECTION_MISMATCH 882 KBUILD_CFLAGS += -fno-inline-functions-called-once 883 endif 884 885 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 886 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 887 LDFLAGS_vmlinux += --gc-sections 888 endif 889 890 ifdef CONFIG_SHADOW_CALL_STACK 891 CC_FLAGS_SCS := -fsanitize=shadow-call-stack 892 KBUILD_CFLAGS += $(CC_FLAGS_SCS) 893 export CC_FLAGS_SCS 894 endif 895 896 ifdef CONFIG_LTO_CLANG 897 ifdef CONFIG_LTO_CLANG_THIN 898 CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 899 KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache 900 else 901 CC_FLAGS_LTO := -flto 902 endif 903 CC_FLAGS_LTO += -fvisibility=hidden 904 905 # Limit inlining across translation units to reduce binary size 906 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 907 908 # Check for frame size exceeding threshold during prolog/epilog insertion 909 # when using lld < 13.0.0. 910 ifneq ($(CONFIG_FRAME_WARN),0) 911 ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0) 912 KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) 913 endif 914 endif 915 endif 916 917 ifdef CONFIG_LTO 918 KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 919 KBUILD_AFLAGS += -fno-lto 920 export CC_FLAGS_LTO 921 endif 922 923 ifdef CONFIG_CFI_CLANG 924 CC_FLAGS_CFI := -fsanitize=cfi \ 925 -fsanitize-cfi-cross-dso \ 926 -fno-sanitize-cfi-canonical-jump-tables \ 927 -fno-sanitize-trap=cfi \ 928 -fno-sanitize-blacklist 929 930 ifdef CONFIG_CFI_PERMISSIVE 931 CC_FLAGS_CFI += -fsanitize-recover=cfi 932 endif 933 934 # If LTO flags are filtered out, we must also filter out CFI. 935 CC_FLAGS_LTO += $(CC_FLAGS_CFI) 936 KBUILD_CFLAGS += $(CC_FLAGS_CFI) 937 export CC_FLAGS_CFI 938 endif 939 940 ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B 941 KBUILD_CFLAGS += -falign-functions=64 942 endif 943 944 # arch Makefile may override CC so keep this after arch Makefile is included 945 NOSTDINC_FLAGS += -nostdinc 946 947 # warn about C99 declaration after statement 948 KBUILD_CFLAGS += -Wdeclaration-after-statement 949 950 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel 951 KBUILD_CFLAGS += -Wvla 952 953 # disable pointer signed / unsigned warnings in gcc 4.0 954 KBUILD_CFLAGS += -Wno-pointer-sign 955 956 # disable stringop warnings in gcc 8+ 957 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 958 959 # We'll want to enable this eventually, but it's not going away for 5.7 at least 960 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 961 KBUILD_CFLAGS += -Wno-array-bounds 962 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 963 964 # Another good warning that we'll want to enable eventually 965 KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 966 967 # Enabled with W=2, disabled by default as noisy 968 ifdef CONFIG_CC_IS_GCC 969 KBUILD_CFLAGS += -Wno-maybe-uninitialized 970 endif 971 972 ifdef CONFIG_CC_IS_GCC 973 # The allocators already balk at large sizes, so silence the compiler 974 # warnings for bounds checks involving those possible values. While 975 # -Wno-alloc-size-larger-than would normally be used here, earlier versions 976 # of gcc (<9.1) weirdly don't handle the option correctly when _other_ 977 # warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX 978 # doesn't work (as it is documented to), silently resolving to "0" prior to 979 # version 9.1 (and producing an error more recently). Numeric values larger 980 # than PTRDIFF_MAX also don't work prior to version 9.1, which are silently 981 # ignored, continuing to default to PTRDIFF_MAX. So, left with no other 982 # choice, we must perform a versioned check to disable this warning. 983 # https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au 984 KBUILD_CFLAGS += $(call cc-ifversion, -ge, 0901, -Wno-alloc-size-larger-than) 985 endif 986 987 # disable invalid "can't wrap" optimizations for signed / pointers 988 KBUILD_CFLAGS += -fno-strict-overflow 989 990 # Make sure -fstack-check isn't enabled (like gentoo apparently did) 991 KBUILD_CFLAGS += -fno-stack-check 992 993 # conserve stack if available 994 ifdef CONFIG_CC_IS_GCC 995 KBUILD_CFLAGS += -fconserve-stack 996 endif 997 998 # Prohibit date/time macros, which would make the build non-deterministic 999 KBUILD_CFLAGS += -Werror=date-time 1000 1001 # enforce correct pointer usage 1002 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 1003 1004 # Require designated initializers for all marked structures 1005 KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 1006 1007 # change __FILE__ to the relative path from the srctree 1008 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1009 1010 # include additional Makefiles when needed 1011 include-y := scripts/Makefile.extrawarn 1012 include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1013 include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1014 include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1015 include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1016 include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1017 include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1018 1019 include $(addprefix $(srctree)/, $(include-y)) 1020 1021 # scripts/Makefile.gcc-plugins is intentionally included last. 1022 # Do not add $(call cc-option,...) below this line. When you build the kernel 1023 # from the clean source tree, the GCC plugins do not exist at this point. 1024 1025 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 1026 KBUILD_CPPFLAGS += $(KCPPFLAGS) 1027 KBUILD_AFLAGS += $(KAFLAGS) 1028 KBUILD_CFLAGS += $(KCFLAGS) 1029 1030 KBUILD_LDFLAGS_MODULE += --build-id=sha1 1031 LDFLAGS_vmlinux += --build-id=sha1 1032 1033 ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1034 LDFLAGS_vmlinux += $(call ld-option, -X,) 1035 endif 1036 1037 ifeq ($(CONFIG_RELR),y) 1038 LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags 1039 endif 1040 1041 # We never want expected sections to be placed heuristically by the 1042 # linker. All sections should be explicitly named in the linker script. 1043 ifdef CONFIG_LD_ORPHAN_WARN 1044 LDFLAGS_vmlinux += --orphan-handling=warn 1045 endif 1046 1047 # Align the bit size of userspace programs with the kernel 1048 KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1049 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1050 1051 # make the checker run with the right architecture 1052 CHECKFLAGS += --arch=$(ARCH) 1053 1054 # insure the checker run with the right endianness 1055 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1056 1057 # the checker needs the correct machine size 1058 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1059 1060 # Default kernel image to build when no specific target is given. 1061 # KBUILD_IMAGE may be overruled on the command line or 1062 # set in the environment 1063 # Also any assignments in arch/$(ARCH)/Makefile take precedence over 1064 # this default value 1065 export KBUILD_IMAGE ?= vmlinux 1066 1067 # 1068 # INSTALL_PATH specifies where to place the updated kernel and system map 1069 # images. Default is /boot, but you can set it to other values 1070 export INSTALL_PATH ?= /boot 1071 1072 # 1073 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1074 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1075 # an argument if needed. Otherwise it defaults to the kernel install path 1076 # 1077 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1078 1079 # 1080 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1081 # relocations required by build roots. This is not defined in the 1082 # makefile but the argument can be passed to make if needed. 1083 # 1084 1085 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1086 export MODLIB 1087 1088 PHONY += prepare0 1089 1090 export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1091 export MODORDER := $(extmod_prefix)modules.order 1092 export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1093 1094 ifeq ($(KBUILD_EXTMOD),) 1095 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ 1096 core-$(CONFIG_BLOCK) += block/ 1097 1098 vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1099 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1100 $(libs-y) $(libs-m))) 1101 1102 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1103 $(patsubst %/,%,$(filter %/, $(core-) \ 1104 $(drivers-) $(libs-)))) 1105 1106 subdir-modorder := $(addsuffix modules.order,$(filter %/, \ 1107 $(core-y) $(core-m) $(libs-y) $(libs-m) \ 1108 $(drivers-y) $(drivers-m))) 1109 1110 build-dirs := $(vmlinux-dirs) 1111 clean-dirs := $(vmlinux-alldirs) 1112 1113 # Externally visible symbols (used by link-vmlinux.sh) 1114 KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1115 KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1116 ifdef CONFIG_MODULES 1117 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1118 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1119 else 1120 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1121 endif 1122 KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1123 1124 export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1125 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1126 # used by scripts/Makefile.package 1127 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1128 1129 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1130 1131 # Recurse until adjust_autoksyms.sh is satisfied 1132 PHONY += autoksyms_recursive 1133 ifdef CONFIG_TRIM_UNUSED_KSYMS 1134 # For the kernel to actually contain only the needed exported symbols, 1135 # we have to build modules as well to determine what those symbols are. 1136 # (this can be evaluated only once include/config/auto.conf has been included) 1137 KBUILD_MODULES := 1 1138 1139 autoksyms_recursive: descend modules.order 1140 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1141 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1142 endif 1143 1144 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1145 1146 quiet_cmd_autoksyms_h = GEN $@ 1147 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1148 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1149 1150 $(autoksyms_h): 1151 $(call cmd,autoksyms_h) 1152 1153 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1154 1155 # Final link of vmlinux with optional arch pass after final link 1156 cmd_link-vmlinux = \ 1157 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \ 1158 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1159 1160 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1161 +$(call if_changed_dep,link-vmlinux) 1162 1163 targets := vmlinux 1164 1165 # The actual objects are generated when descending, 1166 # make sure no implicit rule kicks in 1167 $(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1168 1169 filechk_kernel.release = \ 1170 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1171 1172 # Store (new) KERNELRELEASE string in include/config/kernel.release 1173 include/config/kernel.release: FORCE 1174 $(call filechk,kernel.release) 1175 1176 # Additional helpers built in scripts/ 1177 # Carefully list dependencies so we do not try to build scripts twice 1178 # in parallel 1179 PHONY += scripts 1180 scripts: scripts_basic scripts_dtc 1181 $(Q)$(MAKE) $(build)=$(@) 1182 1183 # Things we need to do before we recursively start building the kernel 1184 # or the modules are listed in "prepare". 1185 # A multi level approach is used. prepareN is processed before prepareN-1. 1186 # archprepare is used in arch Makefiles and when processed asm symlink, 1187 # version.h and scripts_basic is processed / created. 1188 1189 PHONY += prepare archprepare 1190 1191 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1192 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1193 include/generated/autoconf.h remove-stale-files 1194 1195 prepare0: archprepare 1196 $(Q)$(MAKE) $(build)=scripts/mod 1197 $(Q)$(MAKE) $(build)=. 1198 1199 # All the preparing.. 1200 prepare: prepare0 1201 1202 PHONY += remove-stale-files 1203 remove-stale-files: 1204 $(Q)$(srctree)/scripts/remove-stale-files 1205 1206 # Support for using generic headers in asm-generic 1207 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1208 1209 PHONY += asm-generic uapi-asm-generic 1210 asm-generic: uapi-asm-generic 1211 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1212 generic=include/asm-generic 1213 uapi-asm-generic: 1214 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1215 generic=include/uapi/asm-generic 1216 1217 # Generate some files 1218 # --------------------------------------------------------------------------- 1219 1220 # KERNELRELEASE can change from a few different places, meaning version.h 1221 # needs to be updated, so this check is forced on all builds 1222 1223 uts_len := 64 1224 define filechk_utsrelease.h 1225 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1226 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1227 exit 1; \ 1228 fi; \ 1229 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1230 endef 1231 1232 define filechk_version.h 1233 if [ $(SUBLEVEL) -gt 255 ]; then \ 1234 echo \#define LINUX_VERSION_CODE $(shell \ 1235 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1236 else \ 1237 echo \#define LINUX_VERSION_CODE $(shell \ 1238 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1239 fi; \ 1240 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1241 ((c) > 255 ? 255 : (c)))'; \ 1242 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1243 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1244 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1245 endef 1246 1247 $(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0) 1248 $(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0) 1249 $(version_h): FORCE 1250 $(call filechk,version.h) 1251 1252 include/generated/utsrelease.h: include/config/kernel.release FORCE 1253 $(call filechk,utsrelease.h) 1254 1255 PHONY += headerdep 1256 headerdep: 1257 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1258 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1259 1260 # --------------------------------------------------------------------------- 1261 # Kernel headers 1262 1263 #Default location for installed headers 1264 export INSTALL_HDR_PATH = $(objtree)/usr 1265 1266 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1267 cmd_headers_install = \ 1268 mkdir -p $(INSTALL_HDR_PATH); \ 1269 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1270 usr/include $(INSTALL_HDR_PATH) 1271 1272 PHONY += headers_install 1273 headers_install: headers 1274 $(call cmd,headers_install) 1275 1276 PHONY += archheaders archscripts 1277 1278 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1279 1280 PHONY += headers 1281 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1282 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1283 $(error Headers not exportable for the $(SRCARCH) architecture)) 1284 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1285 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1286 1287 # Deprecated. It is no-op now. 1288 PHONY += headers_check 1289 headers_check: 1290 @echo >&2 "=================== WARNING ===================" 1291 @echo >&2 "Since Linux 5.5, 'make headers_check' is no-op," 1292 @echo >&2 "and will be removed after Linux 5.15 release." 1293 @echo >&2 "Please remove headers_check from your scripts." 1294 @echo >&2 "===============================================" 1295 1296 ifdef CONFIG_HEADERS_INSTALL 1297 prepare: headers 1298 endif 1299 1300 PHONY += scripts_unifdef 1301 scripts_unifdef: scripts_basic 1302 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1303 1304 # --------------------------------------------------------------------------- 1305 # Install 1306 1307 # Many distributions have the custom install script, /sbin/installkernel. 1308 # If DKMS is installed, 'make install' will eventually recuses back 1309 # to the this Makefile to build and install external modules. 1310 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1311 1312 install: sub_make_done := 1313 1314 # --------------------------------------------------------------------------- 1315 # Tools 1316 1317 ifdef CONFIG_STACK_VALIDATION 1318 prepare: tools/objtool 1319 endif 1320 1321 ifdef CONFIG_BPF 1322 ifdef CONFIG_DEBUG_INFO_BTF 1323 prepare: tools/bpf/resolve_btfids 1324 endif 1325 endif 1326 1327 PHONY += resolve_btfids_clean 1328 1329 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1330 1331 # tools/bpf/resolve_btfids directory might not exist 1332 # in output directory, skip its clean in that case 1333 resolve_btfids_clean: 1334 ifneq ($(wildcard $(resolve_btfids_O)),) 1335 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1336 endif 1337 1338 # Clear a bunch of variables before executing the submake 1339 ifeq ($(quiet),silent_) 1340 tools_silent=s 1341 endif 1342 1343 tools/: FORCE 1344 $(Q)mkdir -p $(objtree)/tools 1345 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1346 1347 tools/%: FORCE 1348 $(Q)mkdir -p $(objtree)/tools 1349 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1350 1351 # --------------------------------------------------------------------------- 1352 # Kernel selftest 1353 1354 PHONY += kselftest 1355 kselftest: 1356 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1357 1358 kselftest-%: FORCE 1359 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1360 1361 PHONY += kselftest-merge 1362 kselftest-merge: 1363 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1364 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1365 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1366 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1367 1368 # --------------------------------------------------------------------------- 1369 # Devicetree files 1370 1371 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1372 dtstree := arch/$(SRCARCH)/boot/dts 1373 endif 1374 1375 ifneq ($(dtstree),) 1376 1377 %.dtb: include/config/kernel.release scripts_dtc 1378 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1379 1380 %.dtbo: include/config/kernel.release scripts_dtc 1381 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1382 1383 PHONY += dtbs dtbs_install dtbs_check 1384 dtbs: include/config/kernel.release scripts_dtc 1385 $(Q)$(MAKE) $(build)=$(dtstree) 1386 1387 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1388 export CHECK_DTBS=y 1389 dtbs: dt_binding_check 1390 endif 1391 1392 dtbs_check: dtbs 1393 1394 dtbs_install: 1395 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1396 1397 ifdef CONFIG_OF_EARLY_FLATTREE 1398 all: dtbs 1399 endif 1400 1401 endif 1402 1403 PHONY += scripts_dtc 1404 scripts_dtc: scripts_basic 1405 $(Q)$(MAKE) $(build)=scripts/dtc 1406 1407 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1408 export CHECK_DT_BINDING=y 1409 endif 1410 1411 PHONY += dt_binding_check 1412 dt_binding_check: scripts_dtc 1413 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1414 1415 # --------------------------------------------------------------------------- 1416 # Modules 1417 1418 ifdef CONFIG_MODULES 1419 1420 # By default, build modules as well 1421 1422 all: modules 1423 1424 # When we're building modules with modversions, we need to consider 1425 # the built-in objects during the descend as well, in order to 1426 # make sure the checksums are up to date before we record them. 1427 ifdef CONFIG_MODVERSIONS 1428 KBUILD_BUILTIN := 1 1429 endif 1430 1431 # Build modules 1432 # 1433 # A module can be listed more than once in obj-m resulting in 1434 # duplicate lines in modules.order files. Those are removed 1435 # using awk while concatenating to the final file. 1436 1437 PHONY += modules 1438 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare 1439 1440 cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1441 1442 modules.order: $(subdir-modorder) FORCE 1443 $(call if_changed,modules_order) 1444 1445 targets += modules.order 1446 1447 # Target to prepare building external modules 1448 PHONY += modules_prepare 1449 modules_prepare: prepare 1450 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1451 1452 export modules_sign_only := 1453 1454 ifeq ($(CONFIG_MODULE_SIG),y) 1455 PHONY += modules_sign 1456 modules_sign: modules_install 1457 @: 1458 1459 # modules_sign is a subset of modules_install. 1460 # 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1461 ifeq ($(filter modules_install,$(MAKECMDGOALS)),) 1462 modules_sign_only := y 1463 endif 1464 endif 1465 1466 modinst_pre := 1467 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 1468 modinst_pre := __modinst_pre 1469 endif 1470 1471 modules_install: $(modinst_pre) 1472 PHONY += __modinst_pre 1473 __modinst_pre: 1474 @rm -rf $(MODLIB)/kernel 1475 @rm -f $(MODLIB)/source 1476 @mkdir -p $(MODLIB)/kernel 1477 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1478 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1479 rm -f $(MODLIB)/build ; \ 1480 ln -s $(CURDIR) $(MODLIB)/build ; \ 1481 fi 1482 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1483 @cp -f modules.builtin $(MODLIB)/ 1484 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1485 1486 endif # CONFIG_MODULES 1487 1488 ### 1489 # Cleaning is done on three levels. 1490 # make clean Delete most generated files 1491 # Leave enough to build external modules 1492 # make mrproper Delete the current configuration, and all generated files 1493 # make distclean Remove editor backup files, patch leftover files and the like 1494 1495 # Directories & files removed with 'make clean' 1496 CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ 1497 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1498 compile_commands.json .thinlto-cache 1499 1500 # Directories & files removed with 'make mrproper' 1501 MRPROPER_FILES += include/config include/generated \ 1502 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1503 debian snap tar-install \ 1504 .config .config.old .version \ 1505 Module.symvers \ 1506 certs/signing_key.pem certs/signing_key.x509 \ 1507 certs/x509.genkey \ 1508 vmlinux-gdb.py \ 1509 *.spec 1510 1511 # clean - Delete most, but leave enough to build external modules 1512 # 1513 clean: rm-files := $(CLEAN_FILES) 1514 1515 PHONY += archclean vmlinuxclean 1516 1517 vmlinuxclean: 1518 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1519 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1520 1521 clean: archclean vmlinuxclean resolve_btfids_clean 1522 1523 # mrproper - Delete all generated files, including .config 1524 # 1525 mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1526 mrproper-dirs := $(addprefix _mrproper_,scripts) 1527 1528 PHONY += $(mrproper-dirs) mrproper 1529 $(mrproper-dirs): 1530 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1531 1532 mrproper: clean $(mrproper-dirs) 1533 $(call cmd,rmfiles) 1534 1535 # distclean 1536 # 1537 PHONY += distclean 1538 1539 distclean: mrproper 1540 @find . $(RCS_FIND_IGNORE) \ 1541 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1542 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1543 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1544 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1545 -type f -print | xargs rm -f 1546 1547 1548 # Packaging of the kernel to various formats 1549 # --------------------------------------------------------------------------- 1550 1551 %src-pkg: FORCE 1552 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1553 %pkg: include/config/kernel.release FORCE 1554 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1555 1556 # Brief documentation of the typical targets used 1557 # --------------------------------------------------------------------------- 1558 1559 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1560 boards := $(sort $(notdir $(boards))) 1561 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1562 board-dirs := $(sort $(notdir $(board-dirs:/=))) 1563 1564 PHONY += help 1565 help: 1566 @echo 'Cleaning targets:' 1567 @echo ' clean - Remove most generated files but keep the config and' 1568 @echo ' enough build support to build external modules' 1569 @echo ' mrproper - Remove all generated files + config + various backup files' 1570 @echo ' distclean - mrproper + remove editor backup and patch files' 1571 @echo '' 1572 @echo 'Configuration targets:' 1573 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1574 @echo '' 1575 @echo 'Other generic targets:' 1576 @echo ' all - Build all targets marked with [*]' 1577 @echo '* vmlinux - Build the bare kernel' 1578 @echo '* modules - Build all modules' 1579 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1580 @echo ' dir/ - Build all files in dir and below' 1581 @echo ' dir/file.[ois] - Build specified target only' 1582 @echo ' dir/file.ll - Build the LLVM assembly file' 1583 @echo ' (requires compiler support for LLVM assembly generation)' 1584 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1585 @echo ' (requires a recent binutils and recent build (System.map))' 1586 @echo ' dir/file.ko - Build module including final link' 1587 @echo ' modules_prepare - Set up for building external modules' 1588 @echo ' tags/TAGS - Generate tags file for editors' 1589 @echo ' cscope - Generate cscope index' 1590 @echo ' gtags - Generate GNU GLOBAL index' 1591 @echo ' kernelrelease - Output the release version string (use with make -s)' 1592 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1593 @echo ' image_name - Output the image name (use with make -s)' 1594 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1595 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1596 echo '' 1597 @echo 'Static analysers:' 1598 @echo ' checkstack - Generate a list of stack hogs' 1599 @echo ' versioncheck - Sanity check on version.h usage' 1600 @echo ' includecheck - Check for duplicate included header files' 1601 @echo ' export_report - List the usages of all exported symbols' 1602 @echo ' headerdep - Detect inclusion cycles in headers' 1603 @echo ' coccicheck - Check with Coccinelle' 1604 @echo ' clang-analyzer - Check with clang static analyzer' 1605 @echo ' clang-tidy - Check with clang-tidy' 1606 @echo '' 1607 @echo 'Tools:' 1608 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1609 @echo '' 1610 @echo 'Kernel selftest:' 1611 @echo ' kselftest - Build and run kernel selftest' 1612 @echo ' Build, install, and boot kernel before' 1613 @echo ' running kselftest on it' 1614 @echo ' Run as root for full coverage' 1615 @echo ' kselftest-all - Build kernel selftest' 1616 @echo ' kselftest-install - Build and install kernel selftest' 1617 @echo ' kselftest-clean - Remove all generated kselftest files' 1618 @echo ' kselftest-merge - Merge all the config dependencies of' 1619 @echo ' kselftest to existing .config.' 1620 @echo '' 1621 @$(if $(dtstree), \ 1622 echo 'Devicetree:'; \ 1623 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1624 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1625 echo ' dt_binding_check - Validate device tree binding documents'; \ 1626 echo ' dtbs_check - Validate device tree source files';\ 1627 echo '') 1628 1629 @echo 'Userspace tools targets:' 1630 @echo ' use "make tools/help"' 1631 @echo ' or "cd tools; make help"' 1632 @echo '' 1633 @echo 'Kernel packaging:' 1634 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1635 @echo '' 1636 @echo 'Documentation targets:' 1637 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1638 @echo '' 1639 @echo 'Architecture specific targets ($(SRCARCH)):' 1640 @$(if $(archhelp),$(archhelp),\ 1641 echo ' No architecture specific help defined for $(SRCARCH)') 1642 @echo '' 1643 @$(if $(boards), \ 1644 $(foreach b, $(boards), \ 1645 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1646 echo '') 1647 @$(if $(board-dirs), \ 1648 $(foreach b, $(board-dirs), \ 1649 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1650 printf " %-16s - Show all of the above\\n" help-boards; \ 1651 echo '') 1652 1653 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1654 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1655 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1656 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1657 @echo ' (sparse by default)' 1658 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1659 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1660 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1661 @echo ' 1: warnings which may be relevant and do not occur too often' 1662 @echo ' 2: warnings which occur quite often but may still be relevant' 1663 @echo ' 3: more obscure warnings, can most likely be ignored' 1664 @echo ' Multiple levels can be combined with W=12 or W=123' 1665 @echo '' 1666 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1667 @echo 'For further info see the ./README file' 1668 1669 1670 help-board-dirs := $(addprefix help-,$(board-dirs)) 1671 1672 help-boards: $(help-board-dirs) 1673 1674 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1675 1676 $(help-board-dirs): help-%: 1677 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1678 @$(if $(boards-per-dir), \ 1679 $(foreach b, $(boards-per-dir), \ 1680 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1681 echo '') 1682 1683 1684 # Documentation targets 1685 # --------------------------------------------------------------------------- 1686 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1687 linkcheckdocs dochelp refcheckdocs 1688 PHONY += $(DOC_TARGETS) 1689 $(DOC_TARGETS): 1690 $(Q)$(MAKE) $(build)=Documentation $@ 1691 1692 # Misc 1693 # --------------------------------------------------------------------------- 1694 1695 PHONY += scripts_gdb 1696 scripts_gdb: prepare0 1697 $(Q)$(MAKE) $(build)=scripts/gdb 1698 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1699 1700 ifdef CONFIG_GDB_SCRIPTS 1701 all: scripts_gdb 1702 endif 1703 1704 else # KBUILD_EXTMOD 1705 1706 ### 1707 # External module support. 1708 # When building external modules the kernel used as basis is considered 1709 # read-only, and no consistency checks are made and the make 1710 # system is not used on the basis kernel. If updates are required 1711 # in the basis kernel ordinary make commands (without M=...) must be used. 1712 1713 # We are always building only modules. 1714 KBUILD_BUILTIN := 1715 KBUILD_MODULES := 1 1716 1717 build-dirs := $(KBUILD_EXTMOD) 1718 $(MODORDER): descend 1719 @: 1720 1721 compile_commands.json: $(extmod_prefix)compile_commands.json 1722 PHONY += compile_commands.json 1723 1724 clean-dirs := $(KBUILD_EXTMOD) 1725 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1726 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1727 1728 PHONY += prepare 1729 # now expand this into a simple variable to reduce the cost of shell evaluations 1730 prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1731 prepare: 1732 @if [ "$(CC_VERSION_TEXT)" != $(CONFIG_CC_VERSION_TEXT) ]; then \ 1733 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1734 echo >&2 " The kernel was built by: "$(CONFIG_CC_VERSION_TEXT); \ 1735 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1736 fi 1737 1738 PHONY += help 1739 help: 1740 @echo ' Building external modules.' 1741 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1742 @echo '' 1743 @echo ' modules - default target, build the module(s)' 1744 @echo ' modules_install - install the module' 1745 @echo ' clean - remove generated files in module directory only' 1746 @echo '' 1747 1748 # no-op for external module builds 1749 PHONY += modules_prepare 1750 1751 endif # KBUILD_EXTMOD 1752 1753 # --------------------------------------------------------------------------- 1754 # Modules 1755 1756 PHONY += modules modules_install 1757 1758 ifdef CONFIG_MODULES 1759 1760 modules: modules_check 1761 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1762 1763 PHONY += modules_check 1764 modules_check: $(MODORDER) 1765 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1766 1767 quiet_cmd_depmod = DEPMOD $(MODLIB) 1768 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1769 $(KERNELRELEASE) 1770 1771 modules_install: 1772 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1773 $(call cmd,depmod) 1774 1775 else # CONFIG_MODULES 1776 1777 # Modules not configured 1778 # --------------------------------------------------------------------------- 1779 1780 modules modules_install: 1781 @echo >&2 '***' 1782 @echo >&2 '*** The present kernel configuration has modules disabled.' 1783 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.' 1784 @echo >&2 '*** to enable CONFIG_MODULES.' 1785 @echo >&2 '***' 1786 @exit 1 1787 1788 endif # CONFIG_MODULES 1789 1790 # Single targets 1791 # --------------------------------------------------------------------------- 1792 # To build individual files in subdirectories, you can do like this: 1793 # 1794 # make foo/bar/baz.s 1795 # 1796 # The supported suffixes for single-target are listed in 'single-targets' 1797 # 1798 # To build only under specific subdirectories, you can do like this: 1799 # 1800 # make foo/bar/baz/ 1801 1802 ifdef single-build 1803 1804 # .ko is special because modpost is needed 1805 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1806 single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1807 1808 $(single-ko): single_modpost 1809 @: 1810 $(single-no-ko): descend 1811 @: 1812 1813 ifeq ($(KBUILD_EXTMOD),) 1814 # For the single build of in-tree modules, use a temporary file to avoid 1815 # the situation of modules_install installing an invalid modules.order. 1816 MODORDER := .modules.tmp 1817 endif 1818 1819 PHONY += single_modpost 1820 single_modpost: $(single-no-ko) modules_prepare 1821 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER) 1822 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1823 1824 KBUILD_MODULES := 1 1825 1826 export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod_prefix), $(single-no-ko)) 1827 1828 # trim unrelated directories 1829 build-dirs := $(foreach d, $(build-dirs), \ 1830 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1831 1832 endif 1833 1834 ifndef CONFIG_MODULES 1835 KBUILD_MODULES := 1836 endif 1837 1838 # Handle descending into subdirectories listed in $(build-dirs) 1839 # Preset locale variables to speed up the build process. Limit locale 1840 # tweaks to this spot to avoid wrong language settings when running 1841 # make menuconfig etc. 1842 # Error messages still appears in the original language 1843 PHONY += descend $(build-dirs) 1844 descend: $(build-dirs) 1845 $(build-dirs): prepare 1846 $(Q)$(MAKE) $(build)=$@ \ 1847 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ 1848 need-builtin=1 need-modorder=1 1849 1850 clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1851 PHONY += $(clean-dirs) clean 1852 $(clean-dirs): 1853 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1854 1855 clean: $(clean-dirs) 1856 $(call cmd,rmfiles) 1857 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1858 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1859 -o -name '*.ko.*' \ 1860 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1861 -o -name '*.dwo' -o -name '*.lst' \ 1862 -o -name '*.su' -o -name '*.mod' \ 1863 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1864 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1865 -o -name '*.asn1.[ch]' \ 1866 -o -name '*.symtypes' -o -name 'modules.order' \ 1867 -o -name '.tmp_*.o.*' \ 1868 -o -name '*.c.[012]*.*' \ 1869 -o -name '*.ll' \ 1870 -o -name '*.gcno' \ 1871 -o -name '*.*.symversions' \) -type f -print | xargs rm -f 1872 1873 # Generate tags for editors 1874 # --------------------------------------------------------------------------- 1875 quiet_cmd_tags = GEN $@ 1876 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1877 1878 tags TAGS cscope gtags: FORCE 1879 $(call cmd,tags) 1880 1881 # Script to generate missing namespace dependencies 1882 # --------------------------------------------------------------------------- 1883 1884 PHONY += nsdeps 1885 nsdeps: export KBUILD_NSDEPS=1 1886 nsdeps: modules 1887 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1888 1889 # Clang Tooling 1890 # --------------------------------------------------------------------------- 1891 1892 quiet_cmd_gen_compile_commands = GEN $@ 1893 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1894 1895 $(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1896 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \ 1897 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1898 $(call if_changed,gen_compile_commands) 1899 1900 targets += $(extmod_prefix)compile_commands.json 1901 1902 PHONY += clang-tidy clang-analyzer 1903 1904 ifdef CONFIG_CC_IS_CLANG 1905 quiet_cmd_clang_tools = CHECK $< 1906 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1907 1908 clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 1909 $(call cmd,clang_tools) 1910 else 1911 clang-tidy clang-analyzer: 1912 @echo "$@ requires CC=clang" >&2 1913 @false 1914 endif 1915 1916 # Scripts to check various things for consistency 1917 # --------------------------------------------------------------------------- 1918 1919 PHONY += includecheck versioncheck coccicheck export_report 1920 1921 includecheck: 1922 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1923 -name '*.[hcS]' -type f -print | sort \ 1924 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1925 1926 versioncheck: 1927 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1928 -name '*.[hcS]' -type f -print | sort \ 1929 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1930 1931 coccicheck: 1932 $(Q)$(BASH) $(srctree)/scripts/$@ 1933 1934 export_report: 1935 $(PERL) $(srctree)/scripts/export_report.pl 1936 1937 PHONY += checkstack kernelrelease kernelversion image_name 1938 1939 # UML needs a little special treatment here. It wants to use the host 1940 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1941 # else wants $(ARCH), including people doing cross-builds, which means 1942 # that $(SUBARCH) doesn't work here. 1943 ifeq ($(ARCH), um) 1944 CHECKSTACK_ARCH := $(SUBARCH) 1945 else 1946 CHECKSTACK_ARCH := $(ARCH) 1947 endif 1948 checkstack: 1949 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1950 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1951 1952 kernelrelease: 1953 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1954 1955 kernelversion: 1956 @echo $(KERNELVERSION) 1957 1958 image_name: 1959 @echo $(KBUILD_IMAGE) 1960 1961 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1962 cmd_rmfiles = rm -rf $(rm-files) 1963 1964 # read saved command lines for existing targets 1965 existing-targets := $(wildcard $(sort $(targets))) 1966 1967 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1968 1969 endif # config-build 1970 endif # mixed-build 1971 endif # need-sub-make 1972 1973 PHONY += FORCE 1974 FORCE: 1975 1976 # Declare the contents of the PHONY variable as phony. We keep that 1977 # information in a variable so we can use it in if_changed and friends. 1978 .PHONY: $(PHONY) 1979