1 # SPDX-License-Identifier: GPL-2.0 2 VERSION = 5 3 PATCHLEVEL = 9 4 SUBLEVEL = 0 5 EXTRAVERSION = -rc1 6 NAME = Kleptomaniac Octopus 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 --%,$(MAKEFLAGS))),) 98 quiet=silent_ 99 endif 100 101 export quiet Q KBUILD_VERBOSE 102 103 # Kbuild will save output files in the current working directory. 104 # This does not need to match to the root of the kernel source tree. 105 # 106 # For example, you can do this: 107 # 108 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 109 # 110 # If you want to save output files in a different location, there are 111 # two syntaxes to specify it. 112 # 113 # 1) O= 114 # Use "make O=dir/to/store/output/files/" 115 # 116 # 2) Set KBUILD_OUTPUT 117 # Set the environment variable KBUILD_OUTPUT to point to the output directory. 118 # export KBUILD_OUTPUT=dir/to/store/output/files/; make 119 # 120 # The O= assignment takes precedence over the KBUILD_OUTPUT environment 121 # variable. 122 123 # Do we want to change the working directory? 124 ifeq ("$(origin O)", "command line") 125 KBUILD_OUTPUT := $(O) 126 endif 127 128 ifneq ($(KBUILD_OUTPUT),) 129 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 130 # expand a shell special character '~'. We use a somewhat tedious way here. 131 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 132 $(if $(abs_objtree),, \ 133 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 134 135 # $(realpath ...) resolves symlinks 136 abs_objtree := $(realpath $(abs_objtree)) 137 else 138 abs_objtree := $(CURDIR) 139 endif # ifneq ($(KBUILD_OUTPUT),) 140 141 ifeq ($(abs_objtree),$(CURDIR)) 142 # Suppress "Entering directory ..." unless we are changing the work directory. 143 MAKEFLAGS += --no-print-directory 144 else 145 need-sub-make := 1 146 endif 147 148 abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST)))) 149 150 ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 151 $(error source directory cannot contain spaces or colons) 152 endif 153 154 ifneq ($(abs_srctree),$(abs_objtree)) 155 # Look for make include files relative to root of kernel src 156 # 157 # This does not become effective immediately because MAKEFLAGS is re-parsed 158 # once after the Makefile is read. We need to invoke sub-make. 159 MAKEFLAGS += --include-dir=$(abs_srctree) 160 need-sub-make := 1 161 endif 162 163 this-makefile := $(lastword $(MAKEFILE_LIST)) 164 165 ifneq ($(filter 3.%,$(MAKE_VERSION)),) 166 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 167 # We need to invoke sub-make to avoid implicit rules in the top Makefile. 168 need-sub-make := 1 169 # Cancel implicit rules for this Makefile. 170 $(this-makefile): ; 171 endif 172 173 export abs_srctree abs_objtree 174 export sub_make_done := 1 175 176 ifeq ($(need-sub-make),1) 177 178 PHONY += $(MAKECMDGOALS) __sub-make 179 180 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 181 @: 182 183 # Invoke a second make in the output directory, passing relevant variables 184 __sub-make: 185 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 186 187 endif # need-sub-make 188 endif # sub_make_done 189 190 # We process the rest of the Makefile if this is the final invocation of make 191 ifeq ($(need-sub-make),) 192 193 # Do not print "Entering directory ...", 194 # but we want to display it when entering to the output directory 195 # so that IDEs/editors are able to understand relative filenames. 196 MAKEFLAGS += --no-print-directory 197 198 # Call a source code checker (by default, "sparse") as part of the 199 # C compilation. 200 # 201 # Use 'make C=1' to enable checking of only re-compiled files. 202 # Use 'make C=2' to enable checking of *all* source files, regardless 203 # of whether they are re-compiled or not. 204 # 205 # See the file "Documentation/dev-tools/sparse.rst" for more details, 206 # including where to get the "sparse" utility. 207 208 ifeq ("$(origin C)", "command line") 209 KBUILD_CHECKSRC = $(C) 210 endif 211 ifndef KBUILD_CHECKSRC 212 KBUILD_CHECKSRC = 0 213 endif 214 215 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 216 # directory of external module to build. Setting M= takes precedence. 217 ifeq ("$(origin M)", "command line") 218 KBUILD_EXTMOD := $(M) 219 endif 220 221 $(if $(word 2, $(KBUILD_EXTMOD)), \ 222 $(error building multiple external modules is not supported)) 223 224 export KBUILD_CHECKSRC KBUILD_EXTMOD 225 226 extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 227 228 ifeq ($(abs_srctree),$(abs_objtree)) 229 # building in the source tree 230 srctree := . 231 building_out_of_srctree := 232 else 233 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 234 # building in a subdirectory of the source tree 235 srctree := .. 236 else 237 srctree := $(abs_srctree) 238 endif 239 building_out_of_srctree := 1 240 endif 241 242 ifneq ($(KBUILD_ABS_SRCTREE),) 243 srctree := $(abs_srctree) 244 endif 245 246 objtree := . 247 VPATH := $(srctree) 248 249 export building_out_of_srctree srctree objtree VPATH 250 251 # To make sure we do not include .config for any of the *config targets 252 # catch them early, and hand them over to scripts/kconfig/Makefile 253 # It is allowed to specify more targets when calling make, including 254 # mixing *config targets and build targets. 255 # For example 'make oldconfig all'. 256 # Detect when mixed targets is specified, and make a second invocation 257 # of make so .config is not included in this case either (for *config). 258 259 version_h := include/generated/uapi/linux/version.h 260 old_version_h := include/linux/version.h 261 262 clean-targets := %clean mrproper cleandocs 263 no-dot-config-targets := $(clean-targets) \ 264 cscope gtags TAGS tags help% %docs check% coccicheck \ 265 $(version_h) headers headers_% archheaders archscripts \ 266 %asm-generic kernelversion %src-pkg dt_binding_check \ 267 outputmakefile 268 no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease 269 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ 270 271 config-build := 272 mixed-build := 273 need-config := 1 274 may-sync-config := 1 275 single-build := 276 277 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 278 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 279 need-config := 280 endif 281 endif 282 283 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 284 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 285 may-sync-config := 286 endif 287 endif 288 289 ifneq ($(KBUILD_EXTMOD),) 290 may-sync-config := 291 endif 292 293 ifeq ($(KBUILD_EXTMOD),) 294 ifneq ($(filter %config,$(MAKECMDGOALS)),) 295 config-build := 1 296 ifneq ($(words $(MAKECMDGOALS)),1) 297 mixed-build := 1 298 endif 299 endif 300 endif 301 302 # We cannot build single targets and the others at the same time 303 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 304 single-build := 1 305 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 306 mixed-build := 1 307 endif 308 endif 309 310 # For "make -j clean all", "make -j mrproper defconfig all", etc. 311 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 312 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 313 mixed-build := 1 314 endif 315 endif 316 317 # install and modules_install need also be processed one by one 318 ifneq ($(filter install,$(MAKECMDGOALS)),) 319 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 320 mixed-build := 1 321 endif 322 endif 323 324 ifdef mixed-build 325 # =========================================================================== 326 # We're called with mixed targets (*config and build targets). 327 # Handle them one by one. 328 329 PHONY += $(MAKECMDGOALS) __build_one_by_one 330 331 $(MAKECMDGOALS): __build_one_by_one 332 @: 333 334 __build_one_by_one: 335 $(Q)set -e; \ 336 for i in $(MAKECMDGOALS); do \ 337 $(MAKE) -f $(srctree)/Makefile $$i; \ 338 done 339 340 else # !mixed-build 341 342 include scripts/Kbuild.include 343 344 # Read KERNELRELEASE from include/config/kernel.release (if it exists) 345 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 346 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 347 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 348 349 include scripts/subarch.include 350 351 # Cross compiling and selecting different set of gcc/bin-utils 352 # --------------------------------------------------------------------------- 353 # 354 # When performing cross compilation for other architectures ARCH shall be set 355 # to the target architecture. (See arch/* for the possibilities). 356 # ARCH can be set during invocation of make: 357 # make ARCH=ia64 358 # Another way is to have ARCH set in the environment. 359 # The default ARCH is the host where make is executed. 360 361 # CROSS_COMPILE specify the prefix used for all executables used 362 # during compilation. Only gcc and related bin-utils executables 363 # are prefixed with $(CROSS_COMPILE). 364 # CROSS_COMPILE can be set on the command line 365 # make CROSS_COMPILE=ia64-linux- 366 # Alternatively CROSS_COMPILE can be set in the environment. 367 # Default value for CROSS_COMPILE is not to prefix executables 368 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 369 ARCH ?= $(SUBARCH) 370 371 # Architecture as present in compile.h 372 UTS_MACHINE := $(ARCH) 373 SRCARCH := $(ARCH) 374 375 # Additional ARCH settings for x86 376 ifeq ($(ARCH),i386) 377 SRCARCH := x86 378 endif 379 ifeq ($(ARCH),x86_64) 380 SRCARCH := x86 381 endif 382 383 # Additional ARCH settings for sparc 384 ifeq ($(ARCH),sparc32) 385 SRCARCH := sparc 386 endif 387 ifeq ($(ARCH),sparc64) 388 SRCARCH := sparc 389 endif 390 391 # Additional ARCH settings for sh 392 ifeq ($(ARCH),sh64) 393 SRCARCH := sh 394 endif 395 396 KCONFIG_CONFIG ?= .config 397 export KCONFIG_CONFIG 398 399 # Default file for 'make defconfig'. This may be overridden by arch-Makefile. 400 export KBUILD_DEFCONFIG := defconfig 401 402 # SHELL used by kbuild 403 CONFIG_SHELL := sh 404 405 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 406 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 407 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 408 409 ifneq ($(LLVM),) 410 HOSTCC = clang 411 HOSTCXX = clang++ 412 else 413 HOSTCC = gcc 414 HOSTCXX = g++ 415 endif 416 417 export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 418 -O2 -fomit-frame-pointer -std=gnu89 419 export KBUILD_USERLDFLAGS := 420 421 KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 422 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 423 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 424 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 425 426 # Make variables (CC, etc...) 427 CPP = $(CC) -E 428 ifneq ($(LLVM),) 429 CC = clang 430 LD = ld.lld 431 AR = llvm-ar 432 NM = llvm-nm 433 OBJCOPY = llvm-objcopy 434 OBJDUMP = llvm-objdump 435 READELF = llvm-readelf 436 OBJSIZE = llvm-size 437 STRIP = llvm-strip 438 else 439 CC = $(CROSS_COMPILE)gcc 440 LD = $(CROSS_COMPILE)ld 441 AR = $(CROSS_COMPILE)ar 442 NM = $(CROSS_COMPILE)nm 443 OBJCOPY = $(CROSS_COMPILE)objcopy 444 OBJDUMP = $(CROSS_COMPILE)objdump 445 READELF = $(CROSS_COMPILE)readelf 446 OBJSIZE = $(CROSS_COMPILE)size 447 STRIP = $(CROSS_COMPILE)strip 448 endif 449 PAHOLE = pahole 450 RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 451 LEX = flex 452 YACC = bison 453 AWK = awk 454 INSTALLKERNEL := installkernel 455 DEPMOD = /sbin/depmod 456 PERL = perl 457 PYTHON = python 458 PYTHON3 = python3 459 CHECK = sparse 460 BASH = bash 461 KGZIP = gzip 462 KBZIP2 = bzip2 463 KLZOP = lzop 464 LZMA = lzma 465 LZ4 = lz4c 466 XZ = xz 467 ZSTD = zstd 468 469 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 470 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 471 NOSTDINC_FLAGS := 472 CFLAGS_MODULE = 473 AFLAGS_MODULE = 474 LDFLAGS_MODULE = 475 CFLAGS_KERNEL = 476 AFLAGS_KERNEL = 477 LDFLAGS_vmlinux = 478 479 # Use USERINCLUDE when you must reference the UAPI directories only. 480 USERINCLUDE := \ 481 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 482 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 483 -I$(srctree)/include/uapi \ 484 -I$(objtree)/include/generated/uapi \ 485 -include $(srctree)/include/linux/kconfig.h 486 487 # Use LINUXINCLUDE when you must reference the include/ directory. 488 # Needed to be compatible with the O= option 489 LINUXINCLUDE := \ 490 -I$(srctree)/arch/$(SRCARCH)/include \ 491 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 492 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 493 -I$(objtree)/include \ 494 $(USERINCLUDE) 495 496 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 497 KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 498 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 499 -Werror=implicit-function-declaration -Werror=implicit-int \ 500 -Wno-format-security \ 501 -std=gnu89 502 KBUILD_CPPFLAGS := -D__KERNEL__ 503 KBUILD_AFLAGS_KERNEL := 504 KBUILD_CFLAGS_KERNEL := 505 KBUILD_AFLAGS_MODULE := -DMODULE 506 KBUILD_CFLAGS_MODULE := -DMODULE 507 KBUILD_LDFLAGS_MODULE := 508 export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds 509 KBUILD_LDFLAGS := 510 CLANG_FLAGS := 511 512 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 513 export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 514 export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 515 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 516 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 517 518 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 519 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 520 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN CFLAGS_KCSAN 521 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 522 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 523 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 524 525 # Files to ignore in find ... statements 526 527 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 528 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 529 -prune -o 530 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 531 --exclude CVS --exclude .pc --exclude .hg --exclude .git 532 533 # =========================================================================== 534 # Rules shared between *config targets and build targets 535 536 # Basic helpers built in scripts/basic/ 537 PHONY += scripts_basic 538 scripts_basic: 539 $(Q)$(MAKE) $(build)=scripts/basic 540 $(Q)rm -f .tmp_quiet_recordmcount 541 542 PHONY += outputmakefile 543 # Before starting out-of-tree build, make sure the source tree is clean. 544 # outputmakefile generates a Makefile in the output directory, if using a 545 # separate output directory. This allows convenient use of make in the 546 # output directory. 547 # At the same time when output Makefile generated, generate .gitignore to 548 # ignore whole output directory 549 outputmakefile: 550 ifdef building_out_of_srctree 551 $(Q)if [ -f $(srctree)/.config -o \ 552 -d $(srctree)/include/config -o \ 553 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 554 echo >&2 "***"; \ 555 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 556 echo >&2 "*** in $(abs_srctree)";\ 557 echo >&2 "***"; \ 558 false; \ 559 fi 560 $(Q)ln -fsn $(srctree) source 561 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 562 $(Q)test -e .gitignore || \ 563 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 564 endif 565 566 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),) 567 ifneq ($(CROSS_COMPILE),) 568 CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) 569 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 570 CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE)) 571 GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) 572 endif 573 ifneq ($(GCC_TOOLCHAIN),) 574 CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) 575 endif 576 ifneq ($(LLVM_IAS),1) 577 CLANG_FLAGS += -no-integrated-as 578 endif 579 CLANG_FLAGS += -Werror=unknown-warning-option 580 KBUILD_CFLAGS += $(CLANG_FLAGS) 581 KBUILD_AFLAGS += $(CLANG_FLAGS) 582 export CLANG_FLAGS 583 endif 584 585 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 586 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 587 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 588 # and from include/config/auto.conf.cmd to detect the compiler upgrade. 589 CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1) 590 591 ifdef config-build 592 # =========================================================================== 593 # *config targets only - make sure prerequisites are updated, and descend 594 # in scripts/kconfig to make the *config target 595 596 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 597 # KBUILD_DEFCONFIG may point out an alternative default configuration 598 # used for 'make defconfig' 599 include arch/$(SRCARCH)/Makefile 600 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 601 602 config: outputmakefile scripts_basic FORCE 603 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 604 605 %config: outputmakefile scripts_basic FORCE 606 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 607 608 else #!config-build 609 # =========================================================================== 610 # Build targets only - this includes vmlinux, arch specific targets, clean 611 # targets and others. In general all targets except *config targets. 612 613 # If building an external module we do not care about the all: rule 614 # but instead __all depend on modules 615 PHONY += all 616 ifeq ($(KBUILD_EXTMOD),) 617 __all: all 618 else 619 __all: modules 620 endif 621 622 # Decide whether to build built-in, modular, or both. 623 # Normally, just do built-in. 624 625 KBUILD_MODULES := 626 KBUILD_BUILTIN := 1 627 628 # If we have only "make modules", don't compile built-in objects. 629 ifeq ($(MAKECMDGOALS),modules) 630 KBUILD_BUILTIN := 631 endif 632 633 # If we have "make <whatever> modules", compile modules 634 # in addition to whatever we do anyway. 635 # Just "make" or "make all" shall build modules as well 636 637 ifneq ($(filter all modules nsdeps,$(MAKECMDGOALS)),) 638 KBUILD_MODULES := 1 639 endif 640 641 ifeq ($(MAKECMDGOALS),) 642 KBUILD_MODULES := 1 643 endif 644 645 export KBUILD_MODULES KBUILD_BUILTIN 646 647 ifdef need-config 648 include include/config/auto.conf 649 endif 650 651 ifeq ($(KBUILD_EXTMOD),) 652 # Objects we will link into vmlinux / subdirs we need to visit 653 core-y := init/ usr/ 654 drivers-y := drivers/ sound/ 655 drivers-$(CONFIG_SAMPLES) += samples/ 656 drivers-y += net/ virt/ 657 libs-y := lib/ 658 endif # KBUILD_EXTMOD 659 660 # The all: target is the default when no target is given on the 661 # command line. 662 # This allow a user to issue only 'make' to build a kernel including modules 663 # Defaults to vmlinux, but the arch makefile usually adds further targets 664 all: vmlinux 665 666 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 667 $(call cc-option,-fno-tree-loop-im) \ 668 $(call cc-disable-warning,maybe-uninitialized,) 669 export CFLAGS_GCOV 670 671 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 672 ifdef CONFIG_FUNCTION_TRACER 673 CC_FLAGS_FTRACE := -pg 674 endif 675 676 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 677 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 678 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 679 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 680 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 681 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 682 export RETPOLINE_CFLAGS 683 export RETPOLINE_VDSO_CFLAGS 684 685 include arch/$(SRCARCH)/Makefile 686 687 ifdef need-config 688 ifdef may-sync-config 689 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if 690 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile 691 # because some architectures define CROSS_COMPILE there. 692 include include/config/auto.conf.cmd 693 694 $(KCONFIG_CONFIG): 695 @echo >&2 '***' 696 @echo >&2 '*** Configuration file "$@" not found!' 697 @echo >&2 '***' 698 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 699 @echo >&2 '*** "make menuconfig" or "make xconfig").' 700 @echo >&2 '***' 701 @/bin/false 702 703 # The actual configuration files used during the build are stored in 704 # include/generated/ and include/config/. Update them if .config is newer than 705 # include/config/auto.conf (which mirrors .config). 706 # 707 # This exploits the 'multi-target pattern rule' trick. 708 # The syncconfig should be executed only once to make all the targets. 709 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 710 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 711 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 712 else # !may-sync-config 713 # External modules and some install targets need include/generated/autoconf.h 714 # and include/config/auto.conf but do not care if they are up-to-date. 715 # Use auto.conf to trigger the test 716 PHONY += include/config/auto.conf 717 718 include/config/auto.conf: 719 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 720 echo >&2; \ 721 echo >&2 " ERROR: Kernel configuration is invalid."; \ 722 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 723 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 724 echo >&2 ; \ 725 /bin/false) 726 727 endif # may-sync-config 728 endif # need-config 729 730 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 731 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 732 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 733 KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 734 KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 735 736 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 737 KBUILD_CFLAGS += -O2 738 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 739 KBUILD_CFLAGS += -O3 740 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 741 KBUILD_CFLAGS += -Os 742 endif 743 744 # Tell gcc to never replace conditional load with a non-conditional one 745 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 746 KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 747 748 ifdef CONFIG_READABLE_ASM 749 # Disable optimizations that make assembler listings hard to read. 750 # reorder blocks reorders the control in the function 751 # ipa clone creates specialized cloned functions 752 # partial inlining inlines only parts of functions 753 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 754 $(call cc-option,-fno-ipa-cp-clone,) \ 755 $(call cc-option,-fno-partial-inlining) 756 endif 757 758 ifneq ($(CONFIG_FRAME_WARN),0) 759 KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 760 endif 761 762 stackp-flags-y := -fno-stack-protector 763 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 764 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 765 766 KBUILD_CFLAGS += $(stackp-flags-y) 767 768 ifdef CONFIG_CC_IS_CLANG 769 KBUILD_CPPFLAGS += -Qunused-arguments 770 KBUILD_CFLAGS += -Wno-format-invalid-specifier 771 KBUILD_CFLAGS += -Wno-gnu 772 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 773 # source of a reference will be _MergedGlobals and not on of the whitelisted names. 774 # See modpost pattern 2 775 KBUILD_CFLAGS += -mno-global-merge 776 else 777 778 # These warnings generated too much noise in a regular build. 779 # Use make W=1 to enable them (see scripts/Makefile.extrawarn) 780 KBUILD_CFLAGS += -Wno-unused-but-set-variable 781 782 # Warn about unmarked fall-throughs in switch statement. 783 # Disabled for clang while comment to attribute conversion happens and 784 # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed. 785 KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,) 786 endif 787 788 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 789 ifdef CONFIG_FRAME_POINTER 790 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 791 else 792 # Some targets (ARM with Thumb2, for example), can't be built with frame 793 # pointers. For those, we don't have FUNCTION_TRACER automatically 794 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 795 # incompatible with -fomit-frame-pointer with current GCC, so we don't use 796 # -fomit-frame-pointer with FUNCTION_TRACER. 797 ifndef CONFIG_FUNCTION_TRACER 798 KBUILD_CFLAGS += -fomit-frame-pointer 799 endif 800 endif 801 802 # Initialize all stack variables with a 0xAA pattern. 803 ifdef CONFIG_INIT_STACK_ALL_PATTERN 804 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 805 endif 806 807 # Initialize all stack variables with a zero value. 808 ifdef CONFIG_INIT_STACK_ALL_ZERO 809 # Future support for zero initialization is still being debated, see 810 # https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being 811 # renamed or dropped. 812 KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 813 KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 814 endif 815 816 DEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments) 817 818 ifdef CONFIG_DEBUG_INFO 819 ifdef CONFIG_DEBUG_INFO_SPLIT 820 DEBUG_CFLAGS += -gsplit-dwarf 821 else 822 DEBUG_CFLAGS += -g 823 endif 824 KBUILD_AFLAGS += -Wa,-gdwarf-2 825 endif 826 ifdef CONFIG_DEBUG_INFO_DWARF4 827 DEBUG_CFLAGS += -gdwarf-4 828 endif 829 830 ifdef CONFIG_DEBUG_INFO_REDUCED 831 DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 832 $(call cc-option,-fno-var-tracking) 833 endif 834 835 ifdef CONFIG_DEBUG_INFO_COMPRESSED 836 DEBUG_CFLAGS += -gz=zlib 837 KBUILD_AFLAGS += -gz=zlib 838 KBUILD_LDFLAGS += --compress-debug-sections=zlib 839 endif 840 841 KBUILD_CFLAGS += $(DEBUG_CFLAGS) 842 export DEBUG_CFLAGS 843 844 ifdef CONFIG_FUNCTION_TRACER 845 ifdef CONFIG_FTRACE_MCOUNT_RECORD 846 # gcc 5 supports generating the mcount tables directly 847 ifeq ($(call cc-option-yn,-mrecord-mcount),y) 848 CC_FLAGS_FTRACE += -mrecord-mcount 849 export CC_USING_RECORD_MCOUNT := 1 850 endif 851 ifdef CONFIG_HAVE_NOP_MCOUNT 852 ifeq ($(call cc-option-yn, -mnop-mcount),y) 853 CC_FLAGS_FTRACE += -mnop-mcount 854 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 855 endif 856 endif 857 endif 858 ifdef CONFIG_HAVE_FENTRY 859 ifeq ($(call cc-option-yn, -mfentry),y) 860 CC_FLAGS_FTRACE += -mfentry 861 CC_FLAGS_USING += -DCC_USING_FENTRY 862 endif 863 endif 864 export CC_FLAGS_FTRACE 865 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 866 KBUILD_AFLAGS += $(CC_FLAGS_USING) 867 ifdef CONFIG_DYNAMIC_FTRACE 868 ifdef CONFIG_HAVE_C_RECORDMCOUNT 869 BUILD_C_RECORDMCOUNT := y 870 export BUILD_C_RECORDMCOUNT 871 endif 872 endif 873 endif 874 875 # We trigger additional mismatches with less inlining 876 ifdef CONFIG_DEBUG_SECTION_MISMATCH 877 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 878 endif 879 880 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 881 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 882 LDFLAGS_vmlinux += --gc-sections 883 endif 884 885 ifdef CONFIG_LIVEPATCH 886 KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone) 887 endif 888 889 ifdef CONFIG_SHADOW_CALL_STACK 890 CC_FLAGS_SCS := -fsanitize=shadow-call-stack 891 KBUILD_CFLAGS += $(CC_FLAGS_SCS) 892 export CC_FLAGS_SCS 893 endif 894 895 ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B 896 KBUILD_CFLAGS += -falign-functions=32 897 endif 898 899 # arch Makefile may override CC so keep this after arch Makefile is included 900 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 901 902 # warn about C99 declaration after statement 903 KBUILD_CFLAGS += -Wdeclaration-after-statement 904 905 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel 906 KBUILD_CFLAGS += -Wvla 907 908 # disable pointer signed / unsigned warnings in gcc 4.0 909 KBUILD_CFLAGS += -Wno-pointer-sign 910 911 # disable stringop warnings in gcc 8+ 912 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 913 914 # We'll want to enable this eventually, but it's not going away for 5.7 at least 915 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 916 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) 917 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 918 919 # Another good warning that we'll want to enable eventually 920 KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 921 922 # Enabled with W=2, disabled by default as noisy 923 KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized) 924 925 # disable invalid "can't wrap" optimizations for signed / pointers 926 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 927 928 # clang sets -fmerge-all-constants by default as optimization, but this 929 # is non-conforming behavior for C and in fact breaks the kernel, so we 930 # need to disable it here generally. 931 KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 932 933 # for gcc -fno-merge-all-constants disables everything, but it is fine 934 # to have actual conforming behavior enabled. 935 KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 936 937 # Make sure -fstack-check isn't enabled (like gentoo apparently did) 938 KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 939 940 # conserve stack if available 941 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 942 943 # Prohibit date/time macros, which would make the build non-deterministic 944 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 945 946 # enforce correct pointer usage 947 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 948 949 # Require designated initializers for all marked structures 950 KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 951 952 # change __FILE__ to the relative path from the srctree 953 KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 954 955 # ensure -fcf-protection is disabled when using retpoline as it is 956 # incompatible with -mindirect-branch=thunk-extern 957 ifdef CONFIG_RETPOLINE 958 KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none) 959 endif 960 961 # include additional Makefiles when needed 962 include-y := scripts/Makefile.extrawarn 963 include-$(CONFIG_KASAN) += scripts/Makefile.kasan 964 include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 965 include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 966 include-$(CONFIG_KCOV) += scripts/Makefile.kcov 967 include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 968 969 include $(addprefix $(srctree)/, $(include-y)) 970 971 # scripts/Makefile.gcc-plugins is intentionally included last. 972 # Do not add $(call cc-option,...) below this line. When you build the kernel 973 # from the clean source tree, the GCC plugins do not exist at this point. 974 975 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 976 KBUILD_CPPFLAGS += $(KCPPFLAGS) 977 KBUILD_AFLAGS += $(KAFLAGS) 978 KBUILD_CFLAGS += $(KCFLAGS) 979 980 KBUILD_LDFLAGS_MODULE += --build-id 981 LDFLAGS_vmlinux += --build-id 982 983 ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 984 LDFLAGS_vmlinux += $(call ld-option, -X,) 985 endif 986 987 ifeq ($(CONFIG_RELR),y) 988 LDFLAGS_vmlinux += --pack-dyn-relocs=relr 989 endif 990 991 # Align the bit size of userspace programs with the kernel 992 KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 993 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 994 995 # make the checker run with the right architecture 996 CHECKFLAGS += --arch=$(ARCH) 997 998 # insure the checker run with the right endianness 999 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1000 1001 # the checker needs the correct machine size 1002 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1003 1004 # Default kernel image to build when no specific target is given. 1005 # KBUILD_IMAGE may be overruled on the command line or 1006 # set in the environment 1007 # Also any assignments in arch/$(ARCH)/Makefile take precedence over 1008 # this default value 1009 export KBUILD_IMAGE ?= vmlinux 1010 1011 # 1012 # INSTALL_PATH specifies where to place the updated kernel and system map 1013 # images. Default is /boot, but you can set it to other values 1014 export INSTALL_PATH ?= /boot 1015 1016 # 1017 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1018 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1019 # an argument if needed. Otherwise it defaults to the kernel install path 1020 # 1021 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1022 1023 # 1024 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1025 # relocations required by build roots. This is not defined in the 1026 # makefile but the argument can be passed to make if needed. 1027 # 1028 1029 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1030 export MODLIB 1031 1032 # 1033 # INSTALL_MOD_STRIP, if defined, will cause modules to be 1034 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 1035 # the default option --strip-debug will be used. Otherwise, 1036 # INSTALL_MOD_STRIP value will be used as the options to the strip command. 1037 1038 ifdef INSTALL_MOD_STRIP 1039 ifeq ($(INSTALL_MOD_STRIP),1) 1040 mod_strip_cmd = $(STRIP) --strip-debug 1041 else 1042 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 1043 endif # INSTALL_MOD_STRIP=1 1044 else 1045 mod_strip_cmd = true 1046 endif # INSTALL_MOD_STRIP 1047 export mod_strip_cmd 1048 1049 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 1050 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 1051 # or CONFIG_MODULE_COMPRESS_XZ. 1052 1053 mod_compress_cmd = true 1054 ifdef CONFIG_MODULE_COMPRESS 1055 ifdef CONFIG_MODULE_COMPRESS_GZIP 1056 mod_compress_cmd = $(KGZIP) -n -f 1057 endif # CONFIG_MODULE_COMPRESS_GZIP 1058 ifdef CONFIG_MODULE_COMPRESS_XZ 1059 mod_compress_cmd = $(XZ) -f 1060 endif # CONFIG_MODULE_COMPRESS_XZ 1061 endif # CONFIG_MODULE_COMPRESS 1062 export mod_compress_cmd 1063 1064 ifdef CONFIG_MODULE_SIG_ALL 1065 $(eval $(call config_filename,MODULE_SIG_KEY)) 1066 1067 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 1068 else 1069 mod_sign_cmd = true 1070 endif 1071 export mod_sign_cmd 1072 1073 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 1074 1075 has_libelf = $(call try-run,\ 1076 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 1077 1078 ifdef CONFIG_STACK_VALIDATION 1079 ifeq ($(has_libelf),1) 1080 objtool_target := tools/objtool FORCE 1081 else 1082 SKIP_STACK_VALIDATION := 1 1083 export SKIP_STACK_VALIDATION 1084 endif 1085 endif 1086 1087 ifdef CONFIG_DEBUG_INFO_BTF 1088 ifeq ($(has_libelf),1) 1089 resolve_btfids_target := tools/bpf/resolve_btfids FORCE 1090 else 1091 ERROR_RESOLVE_BTFIDS := 1 1092 endif 1093 endif 1094 1095 PHONY += prepare0 1096 1097 export MODORDER := $(extmod-prefix)modules.order 1098 export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps 1099 1100 ifeq ($(KBUILD_EXTMOD),) 1101 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 1102 1103 vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1104 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1105 $(libs-y) $(libs-m))) 1106 1107 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1108 $(patsubst %/,%,$(filter %/, $(core-) \ 1109 $(drivers-) $(libs-)))) 1110 1111 subdir-modorder := $(addsuffix modules.order,$(filter %/, \ 1112 $(core-y) $(core-m) $(libs-y) $(libs-m) \ 1113 $(drivers-y) $(drivers-m))) 1114 1115 build-dirs := $(vmlinux-dirs) 1116 clean-dirs := $(vmlinux-alldirs) 1117 1118 # Externally visible symbols (used by link-vmlinux.sh) 1119 KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1120 KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1121 ifdef CONFIG_MODULES 1122 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1123 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1124 else 1125 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1126 endif 1127 KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1128 1129 export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1130 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1131 # used by scripts/Makefile.package 1132 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1133 1134 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1135 1136 # Recurse until adjust_autoksyms.sh is satisfied 1137 PHONY += autoksyms_recursive 1138 ifdef CONFIG_TRIM_UNUSED_KSYMS 1139 # For the kernel to actually contain only the needed exported symbols, 1140 # we have to build modules as well to determine what those symbols are. 1141 # (this can be evaluated only once include/config/auto.conf has been included) 1142 KBUILD_MODULES := 1 1143 1144 autoksyms_recursive: descend modules.order 1145 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1146 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1147 endif 1148 1149 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1150 1151 quiet_cmd_autoksyms_h = GEN $@ 1152 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1153 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1154 1155 $(autoksyms_h): 1156 $(call cmd,autoksyms_h) 1157 1158 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1159 1160 # Final link of vmlinux with optional arch pass after final link 1161 cmd_link-vmlinux = \ 1162 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \ 1163 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1164 1165 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1166 +$(call if_changed,link-vmlinux) 1167 1168 targets := vmlinux 1169 1170 # The actual objects are generated when descending, 1171 # make sure no implicit rule kicks in 1172 $(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1173 1174 filechk_kernel.release = \ 1175 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1176 1177 # Store (new) KERNELRELEASE string in include/config/kernel.release 1178 include/config/kernel.release: FORCE 1179 $(call filechk,kernel.release) 1180 1181 # Additional helpers built in scripts/ 1182 # Carefully list dependencies so we do not try to build scripts twice 1183 # in parallel 1184 PHONY += scripts 1185 scripts: scripts_basic scripts_dtc 1186 $(Q)$(MAKE) $(build)=$(@) 1187 1188 # Things we need to do before we recursively start building the kernel 1189 # or the modules are listed in "prepare". 1190 # A multi level approach is used. prepareN is processed before prepareN-1. 1191 # archprepare is used in arch Makefiles and when processed asm symlink, 1192 # version.h and scripts_basic is processed / created. 1193 1194 PHONY += prepare archprepare 1195 1196 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1197 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1198 include/generated/autoconf.h 1199 1200 prepare0: archprepare 1201 $(Q)$(MAKE) $(build)=scripts/mod 1202 $(Q)$(MAKE) $(build)=. 1203 1204 # All the preparing.. 1205 prepare: prepare0 prepare-objtool prepare-resolve_btfids 1206 1207 # Support for using generic headers in asm-generic 1208 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1209 1210 PHONY += asm-generic uapi-asm-generic 1211 asm-generic: uapi-asm-generic 1212 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1213 generic=include/asm-generic 1214 uapi-asm-generic: 1215 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1216 generic=include/uapi/asm-generic 1217 1218 PHONY += prepare-objtool prepare-resolve_btfids 1219 prepare-objtool: $(objtool_target) 1220 ifeq ($(SKIP_STACK_VALIDATION),1) 1221 ifdef CONFIG_UNWINDER_ORC 1222 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1223 @false 1224 else 1225 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1226 endif 1227 endif 1228 1229 prepare-resolve_btfids: $(resolve_btfids_target) 1230 ifeq ($(ERROR_RESOLVE_BTFIDS),1) 1231 @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1232 @false 1233 endif 1234 # Generate some files 1235 # --------------------------------------------------------------------------- 1236 1237 # KERNELRELEASE can change from a few different places, meaning version.h 1238 # needs to be updated, so this check is forced on all builds 1239 1240 uts_len := 64 1241 define filechk_utsrelease.h 1242 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1243 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1244 exit 1; \ 1245 fi; \ 1246 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1247 endef 1248 1249 define filechk_version.h 1250 echo \#define LINUX_VERSION_CODE $(shell \ 1251 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1252 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))' 1253 endef 1254 1255 $(version_h): FORCE 1256 $(call filechk,version.h) 1257 $(Q)rm -f $(old_version_h) 1258 1259 include/generated/utsrelease.h: include/config/kernel.release FORCE 1260 $(call filechk,utsrelease.h) 1261 1262 PHONY += headerdep 1263 headerdep: 1264 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1265 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1266 1267 # --------------------------------------------------------------------------- 1268 # Kernel headers 1269 1270 #Default location for installed headers 1271 export INSTALL_HDR_PATH = $(objtree)/usr 1272 1273 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1274 cmd_headers_install = \ 1275 mkdir -p $(INSTALL_HDR_PATH); \ 1276 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1277 usr/include $(INSTALL_HDR_PATH) 1278 1279 PHONY += headers_install 1280 headers_install: headers 1281 $(call cmd,headers_install) 1282 1283 PHONY += archheaders archscripts 1284 1285 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1286 1287 PHONY += headers 1288 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1289 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1290 $(error Headers not exportable for the $(SRCARCH) architecture)) 1291 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1292 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1293 1294 # Deprecated. It is no-op now. 1295 PHONY += headers_check 1296 headers_check: 1297 @: 1298 1299 ifdef CONFIG_HEADERS_INSTALL 1300 prepare: headers 1301 endif 1302 1303 PHONY += scripts_unifdef 1304 scripts_unifdef: scripts_basic 1305 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1306 1307 # --------------------------------------------------------------------------- 1308 # Kernel selftest 1309 1310 PHONY += kselftest 1311 kselftest: 1312 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1313 1314 kselftest-%: FORCE 1315 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1316 1317 PHONY += kselftest-merge 1318 kselftest-merge: 1319 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1320 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1321 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1322 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1323 1324 # --------------------------------------------------------------------------- 1325 # Devicetree files 1326 1327 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1328 dtstree := arch/$(SRCARCH)/boot/dts 1329 endif 1330 1331 ifneq ($(dtstree),) 1332 1333 %.dtb: include/config/kernel.release scripts_dtc 1334 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1335 1336 PHONY += dtbs dtbs_install dtbs_check 1337 dtbs: include/config/kernel.release scripts_dtc 1338 $(Q)$(MAKE) $(build)=$(dtstree) 1339 1340 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1341 export CHECK_DTBS=y 1342 dtbs: dt_binding_check 1343 endif 1344 1345 dtbs_check: dtbs 1346 1347 dtbs_install: 1348 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1349 1350 ifdef CONFIG_OF_EARLY_FLATTREE 1351 all: dtbs 1352 endif 1353 1354 endif 1355 1356 PHONY += scripts_dtc 1357 scripts_dtc: scripts_basic 1358 $(Q)$(MAKE) $(build)=scripts/dtc 1359 1360 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1361 export CHECK_DT_BINDING=y 1362 endif 1363 1364 PHONY += dt_binding_check 1365 dt_binding_check: scripts_dtc 1366 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1367 1368 # --------------------------------------------------------------------------- 1369 # Modules 1370 1371 ifdef CONFIG_MODULES 1372 1373 # By default, build modules as well 1374 1375 all: modules 1376 1377 # When we're building modules with modversions, we need to consider 1378 # the built-in objects during the descend as well, in order to 1379 # make sure the checksums are up to date before we record them. 1380 ifdef CONFIG_MODVERSIONS 1381 KBUILD_BUILTIN := 1 1382 endif 1383 1384 # Build modules 1385 # 1386 # A module can be listed more than once in obj-m resulting in 1387 # duplicate lines in modules.order files. Those are removed 1388 # using awk while concatenating to the final file. 1389 1390 PHONY += modules 1391 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check 1392 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1393 1394 PHONY += modules_check 1395 modules_check: modules.order 1396 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1397 1398 cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1399 1400 modules.order: $(subdir-modorder) FORCE 1401 $(call if_changed,modules_order) 1402 1403 targets += modules.order 1404 1405 # Target to prepare building external modules 1406 PHONY += modules_prepare 1407 modules_prepare: prepare 1408 1409 # Target to install modules 1410 PHONY += modules_install 1411 modules_install: _modinst_ _modinst_post 1412 1413 PHONY += _modinst_ 1414 _modinst_: 1415 @rm -rf $(MODLIB)/kernel 1416 @rm -f $(MODLIB)/source 1417 @mkdir -p $(MODLIB)/kernel 1418 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1419 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1420 rm -f $(MODLIB)/build ; \ 1421 ln -s $(CURDIR) $(MODLIB)/build ; \ 1422 fi 1423 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1424 @cp -f modules.builtin $(MODLIB)/ 1425 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1426 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1427 1428 # This depmod is only for convenience to give the initial 1429 # boot a modules.dep even before / is mounted read-write. However the 1430 # boot script depmod is the master version. 1431 PHONY += _modinst_post 1432 _modinst_post: _modinst_ 1433 $(call cmd,depmod) 1434 1435 ifeq ($(CONFIG_MODULE_SIG), y) 1436 PHONY += modules_sign 1437 modules_sign: 1438 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1439 endif 1440 1441 else # CONFIG_MODULES 1442 1443 # Modules not configured 1444 # --------------------------------------------------------------------------- 1445 1446 PHONY += modules modules_install 1447 modules modules_install: 1448 @echo >&2 1449 @echo >&2 "The present kernel configuration has modules disabled." 1450 @echo >&2 "Type 'make config' and enable loadable module support." 1451 @echo >&2 "Then build a kernel with module support enabled." 1452 @echo >&2 1453 @exit 1 1454 1455 endif # CONFIG_MODULES 1456 1457 ### 1458 # Cleaning is done on three levels. 1459 # make clean Delete most generated files 1460 # Leave enough to build external modules 1461 # make mrproper Delete the current configuration, and all generated files 1462 # make distclean Remove editor backup files, patch leftover files and the like 1463 1464 # Directories & files removed with 'make clean' 1465 CLEAN_FILES += include/ksym vmlinux.symvers \ 1466 modules.builtin modules.builtin.modinfo modules.nsdeps 1467 1468 # Directories & files removed with 'make mrproper' 1469 MRPROPER_FILES += include/config include/generated \ 1470 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1471 debian snap tar-install \ 1472 .config .config.old .version \ 1473 Module.symvers \ 1474 signing_key.pem signing_key.priv signing_key.x509 \ 1475 x509.genkey extra_certificates signing_key.x509.keyid \ 1476 signing_key.x509.signer vmlinux-gdb.py \ 1477 *.spec 1478 1479 # Directories & files removed with 'make distclean' 1480 DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS 1481 1482 # clean - Delete most, but leave enough to build external modules 1483 # 1484 clean: rm-files := $(CLEAN_FILES) 1485 1486 PHONY += archclean vmlinuxclean 1487 1488 vmlinuxclean: 1489 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1490 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1491 1492 clean: archclean vmlinuxclean 1493 1494 # mrproper - Delete all generated files, including .config 1495 # 1496 mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1497 mrproper-dirs := $(addprefix _mrproper_,scripts) 1498 1499 PHONY += $(mrproper-dirs) mrproper 1500 $(mrproper-dirs): 1501 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1502 1503 mrproper: clean $(mrproper-dirs) 1504 $(call cmd,rmfiles) 1505 1506 # distclean 1507 # 1508 distclean: rm-files := $(wildcard $(DISTCLEAN_FILES)) 1509 1510 PHONY += distclean 1511 1512 distclean: mrproper 1513 $(call cmd,rmfiles) 1514 @find $(srctree) $(RCS_FIND_IGNORE) \ 1515 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1516 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1517 -o -name 'core' \) \ 1518 -type f -print | xargs rm -f 1519 1520 1521 # Packaging of the kernel to various formats 1522 # --------------------------------------------------------------------------- 1523 1524 %src-pkg: FORCE 1525 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1526 %pkg: include/config/kernel.release FORCE 1527 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1528 1529 # Brief documentation of the typical targets used 1530 # --------------------------------------------------------------------------- 1531 1532 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1533 boards := $(sort $(notdir $(boards))) 1534 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1535 board-dirs := $(sort $(notdir $(board-dirs:/=))) 1536 1537 PHONY += help 1538 help: 1539 @echo 'Cleaning targets:' 1540 @echo ' clean - Remove most generated files but keep the config and' 1541 @echo ' enough build support to build external modules' 1542 @echo ' mrproper - Remove all generated files + config + various backup files' 1543 @echo ' distclean - mrproper + remove editor backup and patch files' 1544 @echo '' 1545 @echo 'Configuration targets:' 1546 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1547 @echo '' 1548 @echo 'Other generic targets:' 1549 @echo ' all - Build all targets marked with [*]' 1550 @echo '* vmlinux - Build the bare kernel' 1551 @echo '* modules - Build all modules' 1552 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1553 @echo ' dir/ - Build all files in dir and below' 1554 @echo ' dir/file.[ois] - Build specified target only' 1555 @echo ' dir/file.ll - Build the LLVM assembly file' 1556 @echo ' (requires compiler support for LLVM assembly generation)' 1557 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1558 @echo ' (requires a recent binutils and recent build (System.map))' 1559 @echo ' dir/file.ko - Build module including final link' 1560 @echo ' modules_prepare - Set up for building external modules' 1561 @echo ' tags/TAGS - Generate tags file for editors' 1562 @echo ' cscope - Generate cscope index' 1563 @echo ' gtags - Generate GNU GLOBAL index' 1564 @echo ' kernelrelease - Output the release version string (use with make -s)' 1565 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1566 @echo ' image_name - Output the image name (use with make -s)' 1567 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1568 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1569 echo '' 1570 @echo 'Static analysers:' 1571 @echo ' checkstack - Generate a list of stack hogs' 1572 @echo ' namespacecheck - Name space analysis on compiled kernel' 1573 @echo ' versioncheck - Sanity check on version.h usage' 1574 @echo ' includecheck - Check for duplicate included header files' 1575 @echo ' export_report - List the usages of all exported symbols' 1576 @echo ' headerdep - Detect inclusion cycles in headers' 1577 @echo ' coccicheck - Check with Coccinelle' 1578 @echo '' 1579 @echo 'Tools:' 1580 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1581 @echo '' 1582 @echo 'Kernel selftest:' 1583 @echo ' kselftest - Build and run kernel selftest' 1584 @echo ' Build, install, and boot kernel before' 1585 @echo ' running kselftest on it' 1586 @echo ' Run as root for full coverage' 1587 @echo ' kselftest-all - Build kernel selftest' 1588 @echo ' kselftest-install - Build and install kernel selftest' 1589 @echo ' kselftest-clean - Remove all generated kselftest files' 1590 @echo ' kselftest-merge - Merge all the config dependencies of' 1591 @echo ' kselftest to existing .config.' 1592 @echo '' 1593 @$(if $(dtstree), \ 1594 echo 'Devicetree:'; \ 1595 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1596 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1597 echo ' dt_binding_check - Validate device tree binding documents'; \ 1598 echo ' dtbs_check - Validate device tree source files';\ 1599 echo '') 1600 1601 @echo 'Userspace tools targets:' 1602 @echo ' use "make tools/help"' 1603 @echo ' or "cd tools; make help"' 1604 @echo '' 1605 @echo 'Kernel packaging:' 1606 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1607 @echo '' 1608 @echo 'Documentation targets:' 1609 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1610 @echo '' 1611 @echo 'Architecture specific targets ($(SRCARCH)):' 1612 @$(if $(archhelp),$(archhelp),\ 1613 echo ' No architecture specific help defined for $(SRCARCH)') 1614 @echo '' 1615 @$(if $(boards), \ 1616 $(foreach b, $(boards), \ 1617 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1618 echo '') 1619 @$(if $(board-dirs), \ 1620 $(foreach b, $(board-dirs), \ 1621 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1622 printf " %-16s - Show all of the above\\n" help-boards; \ 1623 echo '') 1624 1625 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1626 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1627 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1628 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1629 @echo ' (sparse by default)' 1630 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1631 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1632 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1633 @echo ' 1: warnings which may be relevant and do not occur too often' 1634 @echo ' 2: warnings which occur quite often but may still be relevant' 1635 @echo ' 3: more obscure warnings, can most likely be ignored' 1636 @echo ' Multiple levels can be combined with W=12 or W=123' 1637 @echo '' 1638 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1639 @echo 'For further info see the ./README file' 1640 1641 1642 help-board-dirs := $(addprefix help-,$(board-dirs)) 1643 1644 help-boards: $(help-board-dirs) 1645 1646 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1647 1648 $(help-board-dirs): help-%: 1649 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1650 @$(if $(boards-per-dir), \ 1651 $(foreach b, $(boards-per-dir), \ 1652 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1653 echo '') 1654 1655 1656 # Documentation targets 1657 # --------------------------------------------------------------------------- 1658 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1659 linkcheckdocs dochelp refcheckdocs 1660 PHONY += $(DOC_TARGETS) 1661 $(DOC_TARGETS): 1662 $(Q)$(MAKE) $(build)=Documentation $@ 1663 1664 # Misc 1665 # --------------------------------------------------------------------------- 1666 1667 PHONY += scripts_gdb 1668 scripts_gdb: prepare0 1669 $(Q)$(MAKE) $(build)=scripts/gdb 1670 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1671 1672 ifdef CONFIG_GDB_SCRIPTS 1673 all: scripts_gdb 1674 endif 1675 1676 else # KBUILD_EXTMOD 1677 1678 ### 1679 # External module support. 1680 # When building external modules the kernel used as basis is considered 1681 # read-only, and no consistency checks are made and the make 1682 # system is not used on the basis kernel. If updates are required 1683 # in the basis kernel ordinary make commands (without M=...) must 1684 # be used. 1685 # 1686 # The following are the only valid targets when building external 1687 # modules. 1688 # make M=dir clean Delete all automatically generated files 1689 # make M=dir modules Make all modules in specified dir 1690 # make M=dir Same as 'make M=dir modules' 1691 # make M=dir modules_install 1692 # Install the modules built in the module directory 1693 # Assumes install directory is already created 1694 1695 # We are always building modules 1696 KBUILD_MODULES := 1 1697 1698 build-dirs := $(KBUILD_EXTMOD) 1699 PHONY += modules 1700 modules: descend 1701 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1702 1703 PHONY += modules_install 1704 modules_install: _emodinst_ _emodinst_post 1705 1706 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1707 PHONY += _emodinst_ 1708 _emodinst_: 1709 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1710 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1711 1712 PHONY += _emodinst_post 1713 _emodinst_post: _emodinst_ 1714 $(call cmd,depmod) 1715 1716 clean-dirs := $(KBUILD_EXTMOD) 1717 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps 1718 1719 PHONY += help 1720 help: 1721 @echo ' Building external modules.' 1722 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1723 @echo '' 1724 @echo ' modules - default target, build the module(s)' 1725 @echo ' modules_install - install the module' 1726 @echo ' clean - remove generated files in module directory only' 1727 @echo '' 1728 1729 PHONY += prepare 1730 endif # KBUILD_EXTMOD 1731 1732 # Single targets 1733 # --------------------------------------------------------------------------- 1734 # To build individual files in subdirectories, you can do like this: 1735 # 1736 # make foo/bar/baz.s 1737 # 1738 # The supported suffixes for single-target are listed in 'single-targets' 1739 # 1740 # To build only under specific subdirectories, you can do like this: 1741 # 1742 # make foo/bar/baz/ 1743 1744 ifdef single-build 1745 1746 # .ko is special because modpost is needed 1747 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1748 single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1749 1750 $(single-ko): single_modpost 1751 @: 1752 $(single-no-ko): descend 1753 @: 1754 1755 ifeq ($(KBUILD_EXTMOD),) 1756 # For the single build of in-tree modules, use a temporary file to avoid 1757 # the situation of modules_install installing an invalid modules.order. 1758 MODORDER := .modules.tmp 1759 endif 1760 1761 PHONY += single_modpost 1762 single_modpost: $(single-no-ko) 1763 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER) 1764 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1765 1766 KBUILD_MODULES := 1 1767 1768 export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko)) 1769 1770 # trim unrelated directories 1771 build-dirs := $(foreach d, $(build-dirs), \ 1772 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1773 1774 endif 1775 1776 ifndef CONFIG_MODULES 1777 KBUILD_MODULES := 1778 endif 1779 1780 # Handle descending into subdirectories listed in $(build-dirs) 1781 # Preset locale variables to speed up the build process. Limit locale 1782 # tweaks to this spot to avoid wrong language settings when running 1783 # make menuconfig etc. 1784 # Error messages still appears in the original language 1785 PHONY += descend $(build-dirs) 1786 descend: $(build-dirs) 1787 $(build-dirs): prepare 1788 $(Q)$(MAKE) $(build)=$@ \ 1789 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ 1790 need-builtin=1 need-modorder=1 1791 1792 clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1793 PHONY += $(clean-dirs) clean 1794 $(clean-dirs): 1795 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1796 1797 clean: $(clean-dirs) 1798 $(call cmd,rmfiles) 1799 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1800 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1801 -o -name '*.ko.*' \ 1802 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1803 -o -name '*.dwo' -o -name '*.lst' \ 1804 -o -name '*.su' -o -name '*.mod' \ 1805 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1806 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1807 -o -name '*.asn1.[ch]' \ 1808 -o -name '*.symtypes' -o -name 'modules.order' \ 1809 -o -name '.tmp_*.o.*' \ 1810 -o -name '*.c.[012]*.*' \ 1811 -o -name '*.ll' \ 1812 -o -name '*.gcno' \) -type f -print | xargs rm -f 1813 1814 # Generate tags for editors 1815 # --------------------------------------------------------------------------- 1816 quiet_cmd_tags = GEN $@ 1817 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1818 1819 tags TAGS cscope gtags: FORCE 1820 $(call cmd,tags) 1821 1822 # Script to generate missing namespace dependencies 1823 # --------------------------------------------------------------------------- 1824 1825 PHONY += nsdeps 1826 nsdeps: export KBUILD_NSDEPS=1 1827 nsdeps: modules 1828 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1829 1830 # Scripts to check various things for consistency 1831 # --------------------------------------------------------------------------- 1832 1833 PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1834 1835 includecheck: 1836 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1837 -name '*.[hcS]' -type f -print | sort \ 1838 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1839 1840 versioncheck: 1841 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1842 -name '*.[hcS]' -type f -print | sort \ 1843 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1844 1845 coccicheck: 1846 $(Q)$(BASH) $(srctree)/scripts/$@ 1847 1848 namespacecheck: 1849 $(PERL) $(srctree)/scripts/namespace.pl 1850 1851 export_report: 1852 $(PERL) $(srctree)/scripts/export_report.pl 1853 1854 PHONY += checkstack kernelrelease kernelversion image_name 1855 1856 # UML needs a little special treatment here. It wants to use the host 1857 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1858 # else wants $(ARCH), including people doing cross-builds, which means 1859 # that $(SUBARCH) doesn't work here. 1860 ifeq ($(ARCH), um) 1861 CHECKSTACK_ARCH := $(SUBARCH) 1862 else 1863 CHECKSTACK_ARCH := $(ARCH) 1864 endif 1865 checkstack: 1866 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1867 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1868 1869 kernelrelease: 1870 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1871 1872 kernelversion: 1873 @echo $(KERNELVERSION) 1874 1875 image_name: 1876 @echo $(KBUILD_IMAGE) 1877 1878 # Clear a bunch of variables before executing the submake 1879 1880 ifeq ($(quiet),silent_) 1881 tools_silent=s 1882 endif 1883 1884 tools/: FORCE 1885 $(Q)mkdir -p $(objtree)/tools 1886 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1887 1888 tools/%: FORCE 1889 $(Q)mkdir -p $(objtree)/tools 1890 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1891 1892 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1893 cmd_rmfiles = rm -rf $(rm-files) 1894 1895 # Run depmod only if we have System.map and depmod is executable 1896 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1897 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1898 $(KERNELRELEASE) 1899 1900 # read saved command lines for existing targets 1901 existing-targets := $(wildcard $(sort $(targets))) 1902 1903 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1904 1905 endif # config-build 1906 endif # mixed-build 1907 endif # need-sub-make 1908 1909 PHONY += FORCE 1910 FORCE: 1911 1912 # Declare the contents of the PHONY variable as phony. We keep that 1913 # information in a variable so we can use it in if_changed and friends. 1914 .PHONY: $(PHONY) 1915