1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 10 4SUBLEVEL = 79 5EXTRAVERSION = 6NAME = Dare mighty things 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 $(error targets prefixed with '__' are only for internal use)) 16 17# That's our default target when none is given on the command line 18PHONY := __all 19__all: 20 21# We are using a recursive build, so we need to do a little thinking 22# to get the ordering right. 23# 24# Most importantly: sub-Makefiles should only ever modify files in 25# their own directory. If in some directory we have a dependency on 26# a file in another dir (which doesn't happen often, but it's often 27# unavoidable when linking the built-in.a targets which finally 28# turn into vmlinux), we will call a sub make in that other dir, and 29# after that we are sure that everything which is in that other dir 30# is now up to date. 31# 32# The only cases where we need to modify files which have global 33# effects are thus separated out and done before the recursive 34# descending is started. They are now explicitly listed as the 35# prepare rule. 36 37ifneq ($(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) 41MAKEFLAGS += -rR 42 43# Avoid funny character set dependencies 44unexport LC_ALL 45LC_COLLATE=C 46LC_NUMERIC=C 47export LC_COLLATE LC_NUMERIC 48 49# Avoid interference with shell env settings 50unexport 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 $@ :< 71# 72# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 73# If KBUILD_VERBOSE equals 1 then the above command is displayed. 74# If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt. 75# 76# To put more focus on warnings, be less verbose as default 77# Use 'make V=1' to see the full commands 78 79ifeq ("$(origin V)", "command line") 80 KBUILD_VERBOSE = $(V) 81endif 82ifndef KBUILD_VERBOSE 83 KBUILD_VERBOSE = 0 84endif 85 86ifeq ($(KBUILD_VERBOSE),1) 87 quiet = 88 Q = 89else 90 quiet=quiet_ 91 Q = @ 92endif 93 94# If the user is running make -s (silent mode), suppress echoing of 95# commands 96 97ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 98 quiet=silent_ 99endif 100 101export quiet Q KBUILD_VERBOSE 102 103# Kbuild will save output files in the current working directory. 104# This does not need to match to the root of the kernel source tree. 105# 106# For example, you can do this: 107# 108# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 109# 110# If you want to save output files in a different location, there are 111# two syntaxes to specify it. 112# 113# 1) O= 114# Use "make O=dir/to/store/output/files/" 115# 116# 2) Set KBUILD_OUTPUT 117# Set the environment variable KBUILD_OUTPUT to point to the output directory. 118# export KBUILD_OUTPUT=dir/to/store/output/files/; make 119# 120# The O= assignment takes precedence over the KBUILD_OUTPUT environment 121# variable. 122 123# Do we want to change the working directory? 124ifeq ("$(origin O)", "command line") 125 KBUILD_OUTPUT := $(O) 126endif 127 128ifneq ($(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. 131abs_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 136abs_objtree := $(realpath $(abs_objtree)) 137else 138abs_objtree := $(CURDIR) 139endif # ifneq ($(KBUILD_OUTPUT),) 140 141ifeq ($(abs_objtree),$(CURDIR)) 142# Suppress "Entering directory ..." unless we are changing the work directory. 143MAKEFLAGS += --no-print-directory 144else 145need-sub-make := 1 146endif 147 148abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST)))) 149 150ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 151$(error source directory cannot contain spaces or colons) 152endif 153 154ifneq ($(abs_srctree),$(abs_objtree)) 155# Look for make include files relative to root of kernel src 156# 157# This does not become effective immediately because MAKEFLAGS is re-parsed 158# once after the Makefile is read. We need to invoke sub-make. 159MAKEFLAGS += --include-dir=$(abs_srctree) 160need-sub-make := 1 161endif 162 163this-makefile := $(lastword $(MAKEFILE_LIST)) 164 165ifneq ($(filter 3.%,$(MAKE_VERSION)),) 166# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 167# We need to invoke sub-make to avoid implicit rules in the top Makefile. 168need-sub-make := 1 169# Cancel implicit rules for this Makefile. 170$(this-makefile): ; 171endif 172 173export abs_srctree abs_objtree 174export sub_make_done := 1 175 176ifeq ($(need-sub-make),1) 177 178PHONY += $(MAKECMDGOALS) __sub-make 179 180$(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 $(MAKECMDGOALS) 186 187endif # need-sub-make 188endif # sub_make_done 189 190# We process the rest of the Makefile if this is the final invocation of make 191ifeq ($(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. 196MAKEFLAGS += --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 208ifeq ("$(origin C)", "command line") 209 KBUILD_CHECKSRC = $(C) 210endif 211ifndef KBUILD_CHECKSRC 212 KBUILD_CHECKSRC = 0 213endif 214 215# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 216# directory of external module to build. Setting M= takes precedence. 217ifeq ("$(origin M)", "command line") 218 KBUILD_EXTMOD := $(M) 219endif 220 221$(if $(word 2, $(KBUILD_EXTMOD)), \ 222 $(error building multiple external modules is not supported)) 223 224export KBUILD_CHECKSRC KBUILD_EXTMOD 225 226extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 227 228ifeq ($(abs_srctree),$(abs_objtree)) 229 # building in the source tree 230 srctree := . 231 building_out_of_srctree := 232else 233 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 234 # building in a subdirectory of the source tree 235 srctree := .. 236 else 237 srctree := $(abs_srctree) 238 endif 239 building_out_of_srctree := 1 240endif 241 242ifneq ($(KBUILD_ABS_SRCTREE),) 243srctree := $(abs_srctree) 244endif 245 246objtree := . 247VPATH := $(srctree) 248 249export 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 259version_h := include/generated/uapi/linux/version.h 260old_version_h := include/linux/version.h 261 262clean-targets := %clean mrproper cleandocs 263no-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 268no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \ 269 image_name 270single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ 271 272config-build := 273mixed-build := 274need-config := 1 275may-sync-config := 1 276single-build := 277 278ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 279 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 280 need-config := 281 endif 282endif 283 284ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 285 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 286 may-sync-config := 287 endif 288endif 289 290ifneq ($(KBUILD_EXTMOD),) 291 may-sync-config := 292endif 293 294ifeq ($(KBUILD_EXTMOD),) 295 ifneq ($(filter %config,$(MAKECMDGOALS)),) 296 config-build := 1 297 ifneq ($(words $(MAKECMDGOALS)),1) 298 mixed-build := 1 299 endif 300 endif 301endif 302 303# We cannot build single targets and the others at the same time 304ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 305 single-build := 1 306 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 307 mixed-build := 1 308 endif 309endif 310 311# For "make -j clean all", "make -j mrproper defconfig all", etc. 312ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 313 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 314 mixed-build := 1 315 endif 316endif 317 318# install and modules_install need also be processed one by one 319ifneq ($(filter install,$(MAKECMDGOALS)),) 320 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 321 mixed-build := 1 322 endif 323endif 324 325ifdef mixed-build 326# =========================================================================== 327# We're called with mixed targets (*config and build targets). 328# Handle them one by one. 329 330PHONY += $(MAKECMDGOALS) __build_one_by_one 331 332$(MAKECMDGOALS): __build_one_by_one 333 @: 334 335__build_one_by_one: 336 $(Q)set -e; \ 337 for i in $(MAKECMDGOALS); do \ 338 $(MAKE) -f $(srctree)/Makefile $$i; \ 339 done 340 341else # !mixed-build 342 343include scripts/Kbuild.include 344 345# Read KERNELRELEASE from include/config/kernel.release (if it exists) 346KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 347KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 348export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 349 350include scripts/subarch.include 351 352# Cross compiling and selecting different set of gcc/bin-utils 353# --------------------------------------------------------------------------- 354# 355# When performing cross compilation for other architectures ARCH shall be set 356# to the target architecture. (See arch/* for the possibilities). 357# ARCH can be set during invocation of make: 358# make ARCH=ia64 359# Another way is to have ARCH set in the environment. 360# The default ARCH is the host where make is executed. 361 362# CROSS_COMPILE specify the prefix used for all executables used 363# during compilation. Only gcc and related bin-utils executables 364# are prefixed with $(CROSS_COMPILE). 365# CROSS_COMPILE can be set on the command line 366# make CROSS_COMPILE=ia64-linux- 367# Alternatively CROSS_COMPILE can be set in the environment. 368# Default value for CROSS_COMPILE is not to prefix executables 369# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 370ARCH ?= $(SUBARCH) 371 372# Architecture as present in compile.h 373UTS_MACHINE := $(ARCH) 374SRCARCH := $(ARCH) 375 376# Additional ARCH settings for x86 377ifeq ($(ARCH),i386) 378 SRCARCH := x86 379endif 380ifeq ($(ARCH),x86_64) 381 SRCARCH := x86 382endif 383 384# Additional ARCH settings for sparc 385ifeq ($(ARCH),sparc32) 386 SRCARCH := sparc 387endif 388ifeq ($(ARCH),sparc64) 389 SRCARCH := sparc 390endif 391 392# Additional ARCH settings for sh 393ifeq ($(ARCH),sh64) 394 SRCARCH := sh 395endif 396 397KCONFIG_CONFIG ?= .config 398export KCONFIG_CONFIG 399 400# Default file for 'make defconfig'. This may be overridden by arch-Makefile. 401export KBUILD_DEFCONFIG := defconfig 402 403# SHELL used by kbuild 404CONFIG_SHELL := sh 405 406HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 407HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 408HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 409 410ifneq ($(LLVM),) 411HOSTCC = clang 412HOSTCXX = clang++ 413else 414HOSTCC = gcc 415HOSTCXX = g++ 416endif 417 418export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 419 -O2 -fomit-frame-pointer -std=gnu89 420export KBUILD_USERLDFLAGS := 421 422KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 423KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 424KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 425KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 426 427# Make variables (CC, etc...) 428CPP = $(CC) -E 429ifneq ($(LLVM),) 430CC = clang 431LD = ld.lld 432AR = llvm-ar 433NM = llvm-nm 434OBJCOPY = llvm-objcopy 435OBJDUMP = llvm-objdump 436READELF = llvm-readelf 437STRIP = llvm-strip 438else 439CC = $(CROSS_COMPILE)gcc 440LD = $(CROSS_COMPILE)ld 441AR = $(CROSS_COMPILE)ar 442NM = $(CROSS_COMPILE)nm 443OBJCOPY = $(CROSS_COMPILE)objcopy 444OBJDUMP = $(CROSS_COMPILE)objdump 445READELF = $(CROSS_COMPILE)readelf 446STRIP = $(CROSS_COMPILE)strip 447endif 448PAHOLE = pahole 449RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 450LEX = flex 451YACC = bison 452AWK = awk 453INSTALLKERNEL := installkernel 454DEPMOD = depmod 455PERL = perl 456PYTHON = python 457PYTHON3 = python3 458CHECK = sparse 459BASH = bash 460KGZIP = gzip 461KBZIP2 = bzip2 462KLZOP = lzop 463LZMA = lzma 464LZ4 = lz4c 465XZ = xz 466ZSTD = zstd 467 468CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 469 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 470NOSTDINC_FLAGS := 471CFLAGS_MODULE = 472AFLAGS_MODULE = 473LDFLAGS_MODULE = 474CFLAGS_KERNEL = 475AFLAGS_KERNEL = 476LDFLAGS_vmlinux = 477 478# Use USERINCLUDE when you must reference the UAPI directories only. 479USERINCLUDE := \ 480 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 481 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 482 -I$(srctree)/include/uapi \ 483 -I$(objtree)/include/generated/uapi \ 484 -include $(srctree)/include/linux/kconfig.h 485 486# Use LINUXINCLUDE when you must reference the include/ directory. 487# Needed to be compatible with the O= option 488LINUXINCLUDE := \ 489 -I$(srctree)/arch/$(SRCARCH)/include \ 490 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 491 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 492 -I$(objtree)/include \ 493 $(USERINCLUDE) 494 495KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 496KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 497 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 498 -Werror=implicit-function-declaration -Werror=implicit-int \ 499 -Werror=return-type -Wno-format-security \ 500 -std=gnu89 501KBUILD_CPPFLAGS := -D__KERNEL__ 502KBUILD_AFLAGS_KERNEL := 503KBUILD_CFLAGS_KERNEL := 504KBUILD_AFLAGS_MODULE := -DMODULE 505KBUILD_CFLAGS_MODULE := -DMODULE 506KBUILD_LDFLAGS_MODULE := 507KBUILD_LDFLAGS := 508CLANG_FLAGS := 509 510export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 511export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 512export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 513export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 514export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 515 516export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 517export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 518export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 519export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 520export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 521 522# Files to ignore in find ... statements 523 524export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 525 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 526 -prune -o 527export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 528 --exclude CVS --exclude .pc --exclude .hg --exclude .git 529 530# =========================================================================== 531# Rules shared between *config targets and build targets 532 533# Basic helpers built in scripts/basic/ 534PHONY += scripts_basic 535scripts_basic: 536 $(Q)$(MAKE) $(build)=scripts/basic 537 $(Q)rm -f .tmp_quiet_recordmcount 538 539PHONY += outputmakefile 540# Before starting out-of-tree build, make sure the source tree is clean. 541# outputmakefile generates a Makefile in the output directory, if using a 542# separate output directory. This allows convenient use of make in the 543# output directory. 544# At the same time when output Makefile generated, generate .gitignore to 545# ignore whole output directory 546outputmakefile: 547ifdef building_out_of_srctree 548 $(Q)if [ -f $(srctree)/.config -o \ 549 -d $(srctree)/include/config -o \ 550 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 551 echo >&2 "***"; \ 552 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 553 echo >&2 "*** in $(abs_srctree)";\ 554 echo >&2 "***"; \ 555 false; \ 556 fi 557 $(Q)ln -fsn $(srctree) source 558 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 559 $(Q)test -e .gitignore || \ 560 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 561endif 562 563ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),) 564ifneq ($(CROSS_COMPILE),) 565CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) 566GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 567CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE)) 568GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) 569endif 570ifneq ($(GCC_TOOLCHAIN),) 571CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) 572endif 573ifneq ($(LLVM_IAS),1) 574CLANG_FLAGS += -no-integrated-as 575endif 576CLANG_FLAGS += -Werror=unknown-warning-option 577KBUILD_CFLAGS += $(CLANG_FLAGS) 578KBUILD_AFLAGS += $(CLANG_FLAGS) 579export CLANG_FLAGS 580endif 581 582# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 583# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 584# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 585# and from include/config/auto.conf.cmd to detect the compiler upgrade. 586CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1) 587 588ifdef config-build 589# =========================================================================== 590# *config targets only - make sure prerequisites are updated, and descend 591# in scripts/kconfig to make the *config target 592 593# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 594# KBUILD_DEFCONFIG may point out an alternative default configuration 595# used for 'make defconfig' 596include arch/$(SRCARCH)/Makefile 597export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 598 599config: outputmakefile scripts_basic FORCE 600 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 601 602%config: outputmakefile scripts_basic FORCE 603 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 604 605else #!config-build 606# =========================================================================== 607# Build targets only - this includes vmlinux, arch specific targets, clean 608# targets and others. In general all targets except *config targets. 609 610# If building an external module we do not care about the all: rule 611# but instead __all depend on modules 612PHONY += all 613ifeq ($(KBUILD_EXTMOD),) 614__all: all 615else 616__all: modules 617endif 618 619# Decide whether to build built-in, modular, or both. 620# Normally, just do built-in. 621 622KBUILD_MODULES := 623KBUILD_BUILTIN := 1 624 625# If we have only "make modules", don't compile built-in objects. 626ifeq ($(MAKECMDGOALS),modules) 627 KBUILD_BUILTIN := 628endif 629 630# If we have "make <whatever> modules", compile modules 631# in addition to whatever we do anyway. 632# Just "make" or "make all" shall build modules as well 633 634ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 635 KBUILD_MODULES := 1 636endif 637 638ifeq ($(MAKECMDGOALS),) 639 KBUILD_MODULES := 1 640endif 641 642export KBUILD_MODULES KBUILD_BUILTIN 643 644ifdef need-config 645include include/config/auto.conf 646endif 647 648ifeq ($(KBUILD_EXTMOD),) 649# Objects we will link into vmlinux / subdirs we need to visit 650core-y := init/ usr/ 651drivers-y := drivers/ sound/ 652drivers-$(CONFIG_SAMPLES) += samples/ 653drivers-y += net/ virt/ 654libs-y := lib/ 655endif # KBUILD_EXTMOD 656 657# The all: target is the default when no target is given on the 658# command line. 659# This allow a user to issue only 'make' to build a kernel including modules 660# Defaults to vmlinux, but the arch makefile usually adds further targets 661all: vmlinux 662 663CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 664 $(call cc-option,-fno-tree-loop-im) \ 665 $(call cc-disable-warning,maybe-uninitialized,) 666export CFLAGS_GCOV 667 668# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 669ifdef CONFIG_FUNCTION_TRACER 670 CC_FLAGS_FTRACE := -pg 671endif 672 673ifdef CONFIG_CC_IS_GCC 674RETPOLINE_CFLAGS := $(call cc-option,-mindirect-branch=thunk-extern -mindirect-branch-register) 675RETPOLINE_VDSO_CFLAGS := $(call cc-option,-mindirect-branch=thunk-inline -mindirect-branch-register) 676endif 677ifdef CONFIG_CC_IS_CLANG 678RETPOLINE_CFLAGS := -mretpoline-external-thunk 679RETPOLINE_VDSO_CFLAGS := -mretpoline 680endif 681 682ifdef CONFIG_RETHUNK 683RETHUNK_CFLAGS := -mfunction-return=thunk-extern 684RETPOLINE_CFLAGS += $(RETHUNK_CFLAGS) 685endif 686 687export RETPOLINE_CFLAGS 688export RETPOLINE_VDSO_CFLAGS 689 690include arch/$(SRCARCH)/Makefile 691 692ifdef need-config 693ifdef may-sync-config 694# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 695# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 696# because some architectures define CROSS_COMPILE there. 697include include/config/auto.conf.cmd 698 699$(KCONFIG_CONFIG): 700 @echo >&2 '***' 701 @echo >&2 '*** Configuration file "$@" not found!' 702 @echo >&2 '***' 703 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 704 @echo >&2 '*** "make menuconfig" or "make xconfig").' 705 @echo >&2 '***' 706 @/bin/false 707 708# The actual configuration files used during the build are stored in 709# include/generated/ and include/config/. Update them if .config is newer than 710# include/config/auto.conf (which mirrors .config). 711# 712# This exploits the 'multi-target pattern rule' trick. 713# The syncconfig should be executed only once to make all the targets. 714# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 715# 716# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 717# so you cannot notice that Kconfig is waiting for the user input. 718%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 719 $(Q)$(kecho) " SYNC $@" 720 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 721else # !may-sync-config 722# External modules and some install targets need include/generated/autoconf.h 723# and include/config/auto.conf but do not care if they are up-to-date. 724# Use auto.conf to trigger the test 725PHONY += include/config/auto.conf 726 727include/config/auto.conf: 728 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 729 echo >&2; \ 730 echo >&2 " ERROR: Kernel configuration is invalid."; \ 731 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 732 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 733 echo >&2 ; \ 734 /bin/false) 735 736endif # may-sync-config 737endif # need-config 738 739KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 740KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 741KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 742KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 743KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 744 745ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 746KBUILD_CFLAGS += -O2 747else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 748KBUILD_CFLAGS += -O3 749else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 750KBUILD_CFLAGS += -Os 751endif 752 753# Tell gcc to never replace conditional load with a non-conditional one 754KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 755KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 756 757ifdef CONFIG_READABLE_ASM 758# Disable optimizations that make assembler listings hard to read. 759# reorder blocks reorders the control in the function 760# ipa clone creates specialized cloned functions 761# partial inlining inlines only parts of functions 762KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 763 $(call cc-option,-fno-ipa-cp-clone,) \ 764 $(call cc-option,-fno-partial-inlining) 765endif 766 767ifneq ($(CONFIG_FRAME_WARN),0) 768KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 769endif 770 771stackp-flags-y := -fno-stack-protector 772stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 773stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 774 775KBUILD_CFLAGS += $(stackp-flags-y) 776 777ifdef CONFIG_CC_IS_CLANG 778KBUILD_CPPFLAGS += -Qunused-arguments 779KBUILD_CFLAGS += -Wno-format-invalid-specifier 780KBUILD_CFLAGS += -Wno-gnu 781# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 782# source of a reference will be _MergedGlobals and not on of the whitelisted names. 783# See modpost pattern 2 784KBUILD_CFLAGS += -mno-global-merge 785else 786 787# Warn about unmarked fall-throughs in switch statement. 788# Disabled for clang while comment to attribute conversion happens and 789# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed. 790KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,) 791endif 792 793# These warnings generated too much noise in a regular build. 794# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 795KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 796 797KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 798ifdef CONFIG_FRAME_POINTER 799KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 800else 801# Some targets (ARM with Thumb2, for example), can't be built with frame 802# pointers. For those, we don't have FUNCTION_TRACER automatically 803# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 804# incompatible with -fomit-frame-pointer with current GCC, so we don't use 805# -fomit-frame-pointer with FUNCTION_TRACER. 806ifndef CONFIG_FUNCTION_TRACER 807KBUILD_CFLAGS += -fomit-frame-pointer 808endif 809endif 810 811# Initialize all stack variables with a 0xAA pattern. 812ifdef CONFIG_INIT_STACK_ALL_PATTERN 813KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 814endif 815 816# Initialize all stack variables with a zero value. 817ifdef CONFIG_INIT_STACK_ALL_ZERO 818# Future support for zero initialization is still being debated, see 819# https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being 820# renamed or dropped. 821KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 822KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 823endif 824 825DEBUG_CFLAGS := 826 827# Workaround for GCC versions < 5.0 828# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801 829ifdef CONFIG_CC_IS_GCC 830DEBUG_CFLAGS += $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments)) 831endif 832 833ifdef CONFIG_DEBUG_INFO 834 835ifdef CONFIG_DEBUG_INFO_SPLIT 836DEBUG_CFLAGS += -gsplit-dwarf 837else 838DEBUG_CFLAGS += -g 839endif 840 841ifneq ($(LLVM_IAS),1) 842KBUILD_AFLAGS += -Wa,-gdwarf-2 843endif 844 845ifdef CONFIG_DEBUG_INFO_DWARF4 846DEBUG_CFLAGS += -gdwarf-4 847endif 848 849ifdef CONFIG_DEBUG_INFO_REDUCED 850DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 851 $(call cc-option,-fno-var-tracking) 852endif 853 854ifdef CONFIG_DEBUG_INFO_COMPRESSED 855DEBUG_CFLAGS += -gz=zlib 856KBUILD_AFLAGS += -gz=zlib 857KBUILD_LDFLAGS += --compress-debug-sections=zlib 858endif 859 860endif # CONFIG_DEBUG_INFO 861 862KBUILD_CFLAGS += $(DEBUG_CFLAGS) 863export DEBUG_CFLAGS 864 865ifdef CONFIG_FUNCTION_TRACER 866ifdef CONFIG_FTRACE_MCOUNT_RECORD 867 # gcc 5 supports generating the mcount tables directly 868 ifeq ($(call cc-option-yn,-mrecord-mcount),y) 869 CC_FLAGS_FTRACE += -mrecord-mcount 870 export CC_USING_RECORD_MCOUNT := 1 871 endif 872 ifdef CONFIG_HAVE_NOP_MCOUNT 873 ifeq ($(call cc-option-yn, -mnop-mcount),y) 874 CC_FLAGS_FTRACE += -mnop-mcount 875 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 876 endif 877 endif 878endif 879ifdef CONFIG_HAVE_FENTRY 880 ifeq ($(call cc-option-yn, -mfentry),y) 881 CC_FLAGS_FTRACE += -mfentry 882 CC_FLAGS_USING += -DCC_USING_FENTRY 883 endif 884endif 885export CC_FLAGS_FTRACE 886KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 887KBUILD_AFLAGS += $(CC_FLAGS_USING) 888ifdef CONFIG_DYNAMIC_FTRACE 889 ifdef CONFIG_HAVE_C_RECORDMCOUNT 890 BUILD_C_RECORDMCOUNT := y 891 export BUILD_C_RECORDMCOUNT 892 endif 893endif 894endif 895 896# We trigger additional mismatches with less inlining 897ifdef CONFIG_DEBUG_SECTION_MISMATCH 898KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 899endif 900 901ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 902KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 903LDFLAGS_vmlinux += --gc-sections 904endif 905 906ifdef CONFIG_SHADOW_CALL_STACK 907CC_FLAGS_SCS := -fsanitize=shadow-call-stack 908KBUILD_CFLAGS += $(CC_FLAGS_SCS) 909export CC_FLAGS_SCS 910endif 911 912ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B 913KBUILD_CFLAGS += -falign-functions=32 914endif 915 916# arch Makefile may override CC so keep this after arch Makefile is included 917NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 918 919# warn about C99 declaration after statement 920KBUILD_CFLAGS += -Wdeclaration-after-statement 921 922# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 923KBUILD_CFLAGS += -Wvla 924 925# disable pointer signed / unsigned warnings in gcc 4.0 926KBUILD_CFLAGS += -Wno-pointer-sign 927 928# disable stringop warnings in gcc 8+ 929KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 930 931# We'll want to enable this eventually, but it's not going away for 5.7 at least 932KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 933KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) 934KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 935 936# Another good warning that we'll want to enable eventually 937KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 938 939# Enabled with W=2, disabled by default as noisy 940KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized) 941 942# disable invalid "can't wrap" optimizations for signed / pointers 943KBUILD_CFLAGS += -fno-strict-overflow 944 945# Make sure -fstack-check isn't enabled (like gentoo apparently did) 946KBUILD_CFLAGS += -fno-stack-check 947 948# conserve stack if available 949KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 950 951# Prohibit date/time macros, which would make the build non-deterministic 952KBUILD_CFLAGS += -Werror=date-time 953 954# enforce correct pointer usage 955KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 956 957# Require designated initializers for all marked structures 958KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 959 960# change __FILE__ to the relative path from the srctree 961KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 962 963# include additional Makefiles when needed 964include-y := scripts/Makefile.extrawarn 965include-$(CONFIG_KASAN) += scripts/Makefile.kasan 966include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 967include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 968include-$(CONFIG_KCOV) += scripts/Makefile.kcov 969include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 970 971include $(addprefix $(srctree)/, $(include-y)) 972 973# scripts/Makefile.gcc-plugins is intentionally included last. 974# Do not add $(call cc-option,...) below this line. When you build the kernel 975# from the clean source tree, the GCC plugins do not exist at this point. 976 977# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 978KBUILD_CPPFLAGS += $(KCPPFLAGS) 979KBUILD_AFLAGS += $(KAFLAGS) 980KBUILD_CFLAGS += $(KCFLAGS) 981 982KBUILD_LDFLAGS_MODULE += --build-id=sha1 983LDFLAGS_vmlinux += --build-id=sha1 984 985ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 986LDFLAGS_vmlinux += $(call ld-option, -X,) 987endif 988 989ifeq ($(CONFIG_RELR),y) 990LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags 991endif 992 993# We never want expected sections to be placed heuristically by the 994# linker. All sections should be explicitly named in the linker script. 995ifdef CONFIG_LD_ORPHAN_WARN 996LDFLAGS_vmlinux += --orphan-handling=warn 997endif 998 999# Align the bit size of userspace programs with the kernel 1000KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1001KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1002 1003# make the checker run with the right architecture 1004CHECKFLAGS += --arch=$(ARCH) 1005 1006# insure the checker run with the right endianness 1007CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1008 1009# the checker needs the correct machine size 1010CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1011 1012# Default kernel image to build when no specific target is given. 1013# KBUILD_IMAGE may be overruled on the command line or 1014# set in the environment 1015# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1016# this default value 1017export KBUILD_IMAGE ?= vmlinux 1018 1019# 1020# INSTALL_PATH specifies where to place the updated kernel and system map 1021# images. Default is /boot, but you can set it to other values 1022export INSTALL_PATH ?= /boot 1023 1024# 1025# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1026# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1027# an argument if needed. Otherwise it defaults to the kernel install path 1028# 1029export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1030 1031# 1032# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1033# relocations required by build roots. This is not defined in the 1034# makefile but the argument can be passed to make if needed. 1035# 1036 1037MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1038export MODLIB 1039 1040# 1041# INSTALL_MOD_STRIP, if defined, will cause modules to be 1042# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 1043# the default option --strip-debug will be used. Otherwise, 1044# INSTALL_MOD_STRIP value will be used as the options to the strip command. 1045 1046ifdef INSTALL_MOD_STRIP 1047ifeq ($(INSTALL_MOD_STRIP),1) 1048mod_strip_cmd = $(STRIP) --strip-debug 1049else 1050mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 1051endif # INSTALL_MOD_STRIP=1 1052else 1053mod_strip_cmd = true 1054endif # INSTALL_MOD_STRIP 1055export mod_strip_cmd 1056 1057# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 1058# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 1059# or CONFIG_MODULE_COMPRESS_XZ. 1060 1061mod_compress_cmd = true 1062ifdef CONFIG_MODULE_COMPRESS 1063 ifdef CONFIG_MODULE_COMPRESS_GZIP 1064 mod_compress_cmd = $(KGZIP) -n -f 1065 endif # CONFIG_MODULE_COMPRESS_GZIP 1066 ifdef CONFIG_MODULE_COMPRESS_XZ 1067 mod_compress_cmd = $(XZ) -f 1068 endif # CONFIG_MODULE_COMPRESS_XZ 1069endif # CONFIG_MODULE_COMPRESS 1070export mod_compress_cmd 1071 1072ifdef CONFIG_MODULE_SIG_ALL 1073$(eval $(call config_filename,MODULE_SIG_KEY)) 1074 1075mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 1076else 1077mod_sign_cmd = true 1078endif 1079export mod_sign_cmd 1080 1081HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 1082 1083has_libelf = $(call try-run,\ 1084 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 1085 1086ifdef CONFIG_STACK_VALIDATION 1087 ifeq ($(has_libelf),1) 1088 objtool_target := tools/objtool FORCE 1089 else 1090 SKIP_STACK_VALIDATION := 1 1091 export SKIP_STACK_VALIDATION 1092 endif 1093endif 1094 1095PHONY += resolve_btfids_clean 1096 1097resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1098 1099# tools/bpf/resolve_btfids directory might not exist 1100# in output directory, skip its clean in that case 1101resolve_btfids_clean: 1102ifneq ($(wildcard $(resolve_btfids_O)),) 1103 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1104endif 1105 1106ifdef CONFIG_BPF 1107ifdef CONFIG_DEBUG_INFO_BTF 1108 ifeq ($(has_libelf),1) 1109 resolve_btfids_target := tools/bpf/resolve_btfids FORCE 1110 else 1111 ERROR_RESOLVE_BTFIDS := 1 1112 endif 1113endif # CONFIG_DEBUG_INFO_BTF 1114endif # CONFIG_BPF 1115 1116PHONY += prepare0 1117 1118export MODORDER := $(extmod-prefix)modules.order 1119export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps 1120 1121ifeq ($(KBUILD_EXTMOD),) 1122core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 1123 1124vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1125 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1126 $(libs-y) $(libs-m))) 1127 1128vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1129 $(patsubst %/,%,$(filter %/, $(core-) \ 1130 $(drivers-) $(libs-)))) 1131 1132subdir-modorder := $(addsuffix modules.order,$(filter %/, \ 1133 $(core-y) $(core-m) $(libs-y) $(libs-m) \ 1134 $(drivers-y) $(drivers-m))) 1135 1136build-dirs := $(vmlinux-dirs) 1137clean-dirs := $(vmlinux-alldirs) 1138 1139# Externally visible symbols (used by link-vmlinux.sh) 1140KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1141KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1142ifdef CONFIG_MODULES 1143KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1144KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1145else 1146KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1147endif 1148KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1149 1150export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1151export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1152# used by scripts/Makefile.package 1153export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1154 1155vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1156 1157# Recurse until adjust_autoksyms.sh is satisfied 1158PHONY += autoksyms_recursive 1159ifdef CONFIG_TRIM_UNUSED_KSYMS 1160# For the kernel to actually contain only the needed exported symbols, 1161# we have to build modules as well to determine what those symbols are. 1162# (this can be evaluated only once include/config/auto.conf has been included) 1163KBUILD_MODULES := 1 1164 1165autoksyms_recursive: descend modules.order 1166 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1167 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1168endif 1169 1170autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1171 1172quiet_cmd_autoksyms_h = GEN $@ 1173 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1174 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1175 1176$(autoksyms_h): 1177 $(call cmd,autoksyms_h) 1178 1179ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1180 1181# Final link of vmlinux with optional arch pass after final link 1182cmd_link-vmlinux = \ 1183 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \ 1184 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1185 1186vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1187 +$(call if_changed,link-vmlinux) 1188 1189targets := vmlinux 1190 1191# The actual objects are generated when descending, 1192# make sure no implicit rule kicks in 1193$(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1194 1195filechk_kernel.release = \ 1196 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1197 1198# Store (new) KERNELRELEASE string in include/config/kernel.release 1199include/config/kernel.release: FORCE 1200 $(call filechk,kernel.release) 1201 1202# Additional helpers built in scripts/ 1203# Carefully list dependencies so we do not try to build scripts twice 1204# in parallel 1205PHONY += scripts 1206scripts: scripts_basic scripts_dtc 1207 $(Q)$(MAKE) $(build)=$(@) 1208 1209# Things we need to do before we recursively start building the kernel 1210# or the modules are listed in "prepare". 1211# A multi level approach is used. prepareN is processed before prepareN-1. 1212# archprepare is used in arch Makefiles and when processed asm symlink, 1213# version.h and scripts_basic is processed / created. 1214 1215PHONY += prepare archprepare 1216 1217archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1218 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1219 include/generated/autoconf.h 1220 1221prepare0: archprepare 1222 $(Q)$(MAKE) $(build)=scripts/mod 1223 $(Q)$(MAKE) $(build)=. 1224 1225# All the preparing.. 1226prepare: prepare0 prepare-objtool prepare-resolve_btfids 1227 1228# Support for using generic headers in asm-generic 1229asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1230 1231PHONY += asm-generic uapi-asm-generic 1232asm-generic: uapi-asm-generic 1233 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1234 generic=include/asm-generic 1235uapi-asm-generic: 1236 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1237 generic=include/uapi/asm-generic 1238 1239PHONY += prepare-objtool prepare-resolve_btfids 1240prepare-objtool: $(objtool_target) 1241ifeq ($(SKIP_STACK_VALIDATION),1) 1242ifdef CONFIG_UNWINDER_ORC 1243 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1244 @false 1245else 1246 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1247endif 1248endif 1249 1250prepare-resolve_btfids: $(resolve_btfids_target) 1251ifeq ($(ERROR_RESOLVE_BTFIDS),1) 1252 @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1253 @false 1254endif 1255# Generate some files 1256# --------------------------------------------------------------------------- 1257 1258# KERNELRELEASE can change from a few different places, meaning version.h 1259# needs to be updated, so this check is forced on all builds 1260 1261uts_len := 64 1262define filechk_utsrelease.h 1263 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1264 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1265 exit 1; \ 1266 fi; \ 1267 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1268endef 1269 1270define filechk_version.h 1271 if [ $(SUBLEVEL) -gt 255 ]; then \ 1272 echo \#define LINUX_VERSION_CODE $(shell \ 1273 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1274 else \ 1275 echo \#define LINUX_VERSION_CODE $(shell \ 1276 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1277 fi; \ 1278 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1279 ((c) > 255 ? 255 : (c)))' 1280endef 1281 1282$(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0) 1283$(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0) 1284$(version_h): FORCE 1285 $(call filechk,version.h) 1286 $(Q)rm -f $(old_version_h) 1287 1288include/generated/utsrelease.h: include/config/kernel.release FORCE 1289 $(call filechk,utsrelease.h) 1290 1291PHONY += headerdep 1292headerdep: 1293 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1294 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1295 1296# --------------------------------------------------------------------------- 1297# Kernel headers 1298 1299#Default location for installed headers 1300export INSTALL_HDR_PATH = $(objtree)/usr 1301 1302quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1303 cmd_headers_install = \ 1304 mkdir -p $(INSTALL_HDR_PATH); \ 1305 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1306 usr/include $(INSTALL_HDR_PATH) 1307 1308PHONY += headers_install 1309headers_install: headers 1310 $(call cmd,headers_install) 1311 1312PHONY += archheaders archscripts 1313 1314hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1315 1316PHONY += headers 1317headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1318 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1319 $(error Headers not exportable for the $(SRCARCH) architecture)) 1320 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1321 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1322 1323# Deprecated. It is no-op now. 1324PHONY += headers_check 1325headers_check: 1326 @: 1327 1328ifdef CONFIG_HEADERS_INSTALL 1329prepare: headers 1330endif 1331 1332PHONY += scripts_unifdef 1333scripts_unifdef: scripts_basic 1334 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1335 1336# --------------------------------------------------------------------------- 1337# Kernel selftest 1338 1339PHONY += kselftest 1340kselftest: 1341 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1342 1343kselftest-%: FORCE 1344 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1345 1346PHONY += kselftest-merge 1347kselftest-merge: 1348 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1349 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1350 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1351 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1352 1353# --------------------------------------------------------------------------- 1354# Devicetree files 1355 1356ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1357dtstree := arch/$(SRCARCH)/boot/dts 1358endif 1359 1360ifneq ($(dtstree),) 1361 1362%.dtb: include/config/kernel.release scripts_dtc 1363 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1364 1365PHONY += dtbs dtbs_install dtbs_check 1366dtbs: include/config/kernel.release scripts_dtc 1367 $(Q)$(MAKE) $(build)=$(dtstree) 1368 1369ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1370export CHECK_DTBS=y 1371dtbs: dt_binding_check 1372endif 1373 1374dtbs_check: dtbs 1375 1376dtbs_install: 1377 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1378 1379ifdef CONFIG_OF_EARLY_FLATTREE 1380all: dtbs 1381endif 1382 1383endif 1384 1385PHONY += scripts_dtc 1386scripts_dtc: scripts_basic 1387 $(Q)$(MAKE) $(build)=scripts/dtc 1388 1389ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1390export CHECK_DT_BINDING=y 1391endif 1392 1393PHONY += dt_binding_check 1394dt_binding_check: scripts_dtc 1395 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1396 1397# --------------------------------------------------------------------------- 1398# Modules 1399 1400ifdef CONFIG_MODULES 1401 1402# By default, build modules as well 1403 1404all: modules 1405 1406# When we're building modules with modversions, we need to consider 1407# the built-in objects during the descend as well, in order to 1408# make sure the checksums are up to date before we record them. 1409ifdef CONFIG_MODVERSIONS 1410 KBUILD_BUILTIN := 1 1411endif 1412 1413# Build modules 1414# 1415# A module can be listed more than once in obj-m resulting in 1416# duplicate lines in modules.order files. Those are removed 1417# using awk while concatenating to the final file. 1418 1419PHONY += modules 1420modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare 1421 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1422 1423PHONY += modules_check 1424modules_check: modules.order 1425 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1426 1427cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1428 1429modules.order: $(subdir-modorder) FORCE 1430 $(call if_changed,modules_order) 1431 1432targets += modules.order 1433 1434# Target to prepare building external modules 1435PHONY += modules_prepare 1436modules_prepare: prepare 1437 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1438 1439# Target to install modules 1440PHONY += modules_install 1441modules_install: _modinst_ _modinst_post 1442 1443PHONY += _modinst_ 1444_modinst_: 1445 @rm -rf $(MODLIB)/kernel 1446 @rm -f $(MODLIB)/source 1447 @mkdir -p $(MODLIB)/kernel 1448 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1449 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1450 rm -f $(MODLIB)/build ; \ 1451 ln -s $(CURDIR) $(MODLIB)/build ; \ 1452 fi 1453 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1454 @cp -f modules.builtin $(MODLIB)/ 1455 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1456 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1457 1458# This depmod is only for convenience to give the initial 1459# boot a modules.dep even before / is mounted read-write. However the 1460# boot script depmod is the master version. 1461PHONY += _modinst_post 1462_modinst_post: _modinst_ 1463 $(call cmd,depmod) 1464 1465ifeq ($(CONFIG_MODULE_SIG), y) 1466PHONY += modules_sign 1467modules_sign: 1468 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1469endif 1470 1471else # CONFIG_MODULES 1472 1473# Modules not configured 1474# --------------------------------------------------------------------------- 1475 1476PHONY += modules modules_install 1477modules modules_install: 1478 @echo >&2 1479 @echo >&2 "The present kernel configuration has modules disabled." 1480 @echo >&2 "Type 'make config' and enable loadable module support." 1481 @echo >&2 "Then build a kernel with module support enabled." 1482 @echo >&2 1483 @exit 1 1484 1485endif # CONFIG_MODULES 1486 1487### 1488# Cleaning is done on three levels. 1489# make clean Delete most generated files 1490# Leave enough to build external modules 1491# make mrproper Delete the current configuration, and all generated files 1492# make distclean Remove editor backup files, patch leftover files and the like 1493 1494# Directories & files removed with 'make clean' 1495CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ 1496 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1497 compile_commands.json 1498 1499# Directories & files removed with 'make mrproper' 1500MRPROPER_FILES += include/config include/generated \ 1501 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1502 debian snap tar-install \ 1503 .config .config.old .version \ 1504 Module.symvers \ 1505 signing_key.pem signing_key.priv signing_key.x509 \ 1506 x509.genkey extra_certificates signing_key.x509.keyid \ 1507 signing_key.x509.signer vmlinux-gdb.py \ 1508 *.spec 1509 1510# Directories & files removed with 'make distclean' 1511DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS 1512 1513# clean - Delete most, but leave enough to build external modules 1514# 1515clean: rm-files := $(CLEAN_FILES) 1516 1517PHONY += archclean vmlinuxclean 1518 1519vmlinuxclean: 1520 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1521 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1522 1523clean: archclean vmlinuxclean resolve_btfids_clean 1524 1525# mrproper - Delete all generated files, including .config 1526# 1527mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1528mrproper-dirs := $(addprefix _mrproper_,scripts) 1529 1530PHONY += $(mrproper-dirs) mrproper 1531$(mrproper-dirs): 1532 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1533 1534mrproper: clean $(mrproper-dirs) 1535 $(call cmd,rmfiles) 1536 1537# distclean 1538# 1539distclean: rm-files := $(wildcard $(DISTCLEAN_FILES)) 1540 1541PHONY += distclean 1542 1543distclean: mrproper 1544 $(call cmd,rmfiles) 1545 @find $(srctree) $(RCS_FIND_IGNORE) \ 1546 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1547 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1548 -o -name 'core' \) \ 1549 -type f -print | xargs rm -f 1550 1551 1552# Packaging of the kernel to various formats 1553# --------------------------------------------------------------------------- 1554 1555%src-pkg: FORCE 1556 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1557%pkg: include/config/kernel.release FORCE 1558 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1559 1560# Brief documentation of the typical targets used 1561# --------------------------------------------------------------------------- 1562 1563boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1564boards := $(sort $(notdir $(boards))) 1565board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1566board-dirs := $(sort $(notdir $(board-dirs:/=))) 1567 1568PHONY += help 1569help: 1570 @echo 'Cleaning targets:' 1571 @echo ' clean - Remove most generated files but keep the config and' 1572 @echo ' enough build support to build external modules' 1573 @echo ' mrproper - Remove all generated files + config + various backup files' 1574 @echo ' distclean - mrproper + remove editor backup and patch files' 1575 @echo '' 1576 @echo 'Configuration targets:' 1577 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1578 @echo '' 1579 @echo 'Other generic targets:' 1580 @echo ' all - Build all targets marked with [*]' 1581 @echo '* vmlinux - Build the bare kernel' 1582 @echo '* modules - Build all modules' 1583 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1584 @echo ' dir/ - Build all files in dir and below' 1585 @echo ' dir/file.[ois] - Build specified target only' 1586 @echo ' dir/file.ll - Build the LLVM assembly file' 1587 @echo ' (requires compiler support for LLVM assembly generation)' 1588 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1589 @echo ' (requires a recent binutils and recent build (System.map))' 1590 @echo ' dir/file.ko - Build module including final link' 1591 @echo ' modules_prepare - Set up for building external modules' 1592 @echo ' tags/TAGS - Generate tags file for editors' 1593 @echo ' cscope - Generate cscope index' 1594 @echo ' gtags - Generate GNU GLOBAL index' 1595 @echo ' kernelrelease - Output the release version string (use with make -s)' 1596 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1597 @echo ' image_name - Output the image name (use with make -s)' 1598 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1599 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1600 echo '' 1601 @echo 'Static analysers:' 1602 @echo ' checkstack - Generate a list of stack hogs' 1603 @echo ' versioncheck - Sanity check on version.h usage' 1604 @echo ' includecheck - Check for duplicate included header files' 1605 @echo ' export_report - List the usages of all exported symbols' 1606 @echo ' headerdep - Detect inclusion cycles in headers' 1607 @echo ' coccicheck - Check with Coccinelle' 1608 @echo ' clang-analyzer - Check with clang static analyzer' 1609 @echo ' clang-tidy - Check with clang-tidy' 1610 @echo '' 1611 @echo 'Tools:' 1612 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1613 @echo '' 1614 @echo 'Kernel selftest:' 1615 @echo ' kselftest - Build and run kernel selftest' 1616 @echo ' Build, install, and boot kernel before' 1617 @echo ' running kselftest on it' 1618 @echo ' Run as root for full coverage' 1619 @echo ' kselftest-all - Build kernel selftest' 1620 @echo ' kselftest-install - Build and install kernel selftest' 1621 @echo ' kselftest-clean - Remove all generated kselftest files' 1622 @echo ' kselftest-merge - Merge all the config dependencies of' 1623 @echo ' kselftest to existing .config.' 1624 @echo '' 1625 @$(if $(dtstree), \ 1626 echo 'Devicetree:'; \ 1627 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1628 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1629 echo ' dt_binding_check - Validate device tree binding documents'; \ 1630 echo ' dtbs_check - Validate device tree source files';\ 1631 echo '') 1632 1633 @echo 'Userspace tools targets:' 1634 @echo ' use "make tools/help"' 1635 @echo ' or "cd tools; make help"' 1636 @echo '' 1637 @echo 'Kernel packaging:' 1638 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1639 @echo '' 1640 @echo 'Documentation targets:' 1641 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1642 @echo '' 1643 @echo 'Architecture specific targets ($(SRCARCH)):' 1644 @$(if $(archhelp),$(archhelp),\ 1645 echo ' No architecture specific help defined for $(SRCARCH)') 1646 @echo '' 1647 @$(if $(boards), \ 1648 $(foreach b, $(boards), \ 1649 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1650 echo '') 1651 @$(if $(board-dirs), \ 1652 $(foreach b, $(board-dirs), \ 1653 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1654 printf " %-16s - Show all of the above\\n" help-boards; \ 1655 echo '') 1656 1657 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1658 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1659 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1660 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1661 @echo ' (sparse by default)' 1662 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1663 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1664 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1665 @echo ' 1: warnings which may be relevant and do not occur too often' 1666 @echo ' 2: warnings which occur quite often but may still be relevant' 1667 @echo ' 3: more obscure warnings, can most likely be ignored' 1668 @echo ' Multiple levels can be combined with W=12 or W=123' 1669 @echo '' 1670 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1671 @echo 'For further info see the ./README file' 1672 1673 1674help-board-dirs := $(addprefix help-,$(board-dirs)) 1675 1676help-boards: $(help-board-dirs) 1677 1678boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1679 1680$(help-board-dirs): help-%: 1681 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1682 @$(if $(boards-per-dir), \ 1683 $(foreach b, $(boards-per-dir), \ 1684 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1685 echo '') 1686 1687 1688# Documentation targets 1689# --------------------------------------------------------------------------- 1690DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1691 linkcheckdocs dochelp refcheckdocs 1692PHONY += $(DOC_TARGETS) 1693$(DOC_TARGETS): 1694 $(Q)$(MAKE) $(build)=Documentation $@ 1695 1696# Misc 1697# --------------------------------------------------------------------------- 1698 1699PHONY += scripts_gdb 1700scripts_gdb: prepare0 1701 $(Q)$(MAKE) $(build)=scripts/gdb 1702 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1703 1704ifdef CONFIG_GDB_SCRIPTS 1705all: scripts_gdb 1706endif 1707 1708else # KBUILD_EXTMOD 1709 1710### 1711# External module support. 1712# When building external modules the kernel used as basis is considered 1713# read-only, and no consistency checks are made and the make 1714# system is not used on the basis kernel. If updates are required 1715# in the basis kernel ordinary make commands (without M=...) must 1716# be used. 1717# 1718# The following are the only valid targets when building external 1719# modules. 1720# make M=dir clean Delete all automatically generated files 1721# make M=dir modules Make all modules in specified dir 1722# make M=dir Same as 'make M=dir modules' 1723# make M=dir modules_install 1724# Install the modules built in the module directory 1725# Assumes install directory is already created 1726 1727# We are always building only modules. 1728KBUILD_BUILTIN := 1729KBUILD_MODULES := 1 1730 1731build-dirs := $(KBUILD_EXTMOD) 1732PHONY += modules 1733modules: $(MODORDER) 1734 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1735 1736$(MODORDER): descend 1737 @: 1738 1739PHONY += modules_install 1740modules_install: _emodinst_ _emodinst_post 1741 1742install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1743PHONY += _emodinst_ 1744_emodinst_: 1745 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1746 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1747 1748PHONY += _emodinst_post 1749_emodinst_post: _emodinst_ 1750 $(call cmd,depmod) 1751 1752compile_commands.json: $(extmod-prefix)compile_commands.json 1753PHONY += compile_commands.json 1754 1755clean-dirs := $(KBUILD_EXTMOD) 1756clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1757 $(KBUILD_EXTMOD)/compile_commands.json 1758 1759PHONY += help 1760help: 1761 @echo ' Building external modules.' 1762 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1763 @echo '' 1764 @echo ' modules - default target, build the module(s)' 1765 @echo ' modules_install - install the module' 1766 @echo ' clean - remove generated files in module directory only' 1767 @echo '' 1768 1769# no-op for external module builds 1770PHONY += prepare modules_prepare 1771 1772endif # KBUILD_EXTMOD 1773 1774# Single targets 1775# --------------------------------------------------------------------------- 1776# To build individual files in subdirectories, you can do like this: 1777# 1778# make foo/bar/baz.s 1779# 1780# The supported suffixes for single-target are listed in 'single-targets' 1781# 1782# To build only under specific subdirectories, you can do like this: 1783# 1784# make foo/bar/baz/ 1785 1786ifdef single-build 1787 1788# .ko is special because modpost is needed 1789single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1790single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1791 1792$(single-ko): single_modpost 1793 @: 1794$(single-no-ko): descend 1795 @: 1796 1797ifeq ($(KBUILD_EXTMOD),) 1798# For the single build of in-tree modules, use a temporary file to avoid 1799# the situation of modules_install installing an invalid modules.order. 1800MODORDER := .modules.tmp 1801endif 1802 1803PHONY += single_modpost 1804single_modpost: $(single-no-ko) modules_prepare 1805 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER) 1806 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1807 1808KBUILD_MODULES := 1 1809 1810export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko)) 1811 1812# trim unrelated directories 1813build-dirs := $(foreach d, $(build-dirs), \ 1814 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1815 1816endif 1817 1818ifndef CONFIG_MODULES 1819KBUILD_MODULES := 1820endif 1821 1822# Handle descending into subdirectories listed in $(build-dirs) 1823# Preset locale variables to speed up the build process. Limit locale 1824# tweaks to this spot to avoid wrong language settings when running 1825# make menuconfig etc. 1826# Error messages still appears in the original language 1827PHONY += descend $(build-dirs) 1828descend: $(build-dirs) 1829$(build-dirs): prepare 1830 $(Q)$(MAKE) $(build)=$@ \ 1831 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ 1832 need-builtin=1 need-modorder=1 1833 1834clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1835PHONY += $(clean-dirs) clean 1836$(clean-dirs): 1837 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1838 1839clean: $(clean-dirs) 1840 $(call cmd,rmfiles) 1841 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1842 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1843 -o -name '*.ko.*' \ 1844 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1845 -o -name '*.dwo' -o -name '*.lst' \ 1846 -o -name '*.su' -o -name '*.mod' \ 1847 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1848 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1849 -o -name '*.asn1.[ch]' \ 1850 -o -name '*.symtypes' -o -name 'modules.order' \ 1851 -o -name '.tmp_*.o.*' \ 1852 -o -name '*.c.[012]*.*' \ 1853 -o -name '*.ll' \ 1854 -o -name '*.gcno' \) -type f -print | xargs rm -f 1855 1856# Generate tags for editors 1857# --------------------------------------------------------------------------- 1858quiet_cmd_tags = GEN $@ 1859 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1860 1861tags TAGS cscope gtags: FORCE 1862 $(call cmd,tags) 1863 1864# Script to generate missing namespace dependencies 1865# --------------------------------------------------------------------------- 1866 1867PHONY += nsdeps 1868nsdeps: export KBUILD_NSDEPS=1 1869nsdeps: modules 1870 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1871 1872# Clang Tooling 1873# --------------------------------------------------------------------------- 1874 1875quiet_cmd_gen_compile_commands = GEN $@ 1876 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1877 1878$(extmod-prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1879 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \ 1880 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1881 $(call if_changed,gen_compile_commands) 1882 1883targets += $(extmod-prefix)compile_commands.json 1884 1885PHONY += clang-tidy clang-analyzer 1886 1887ifdef CONFIG_CC_IS_CLANG 1888quiet_cmd_clang_tools = CHECK $< 1889 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1890 1891clang-tidy clang-analyzer: $(extmod-prefix)compile_commands.json 1892 $(call cmd,clang_tools) 1893else 1894clang-tidy clang-analyzer: 1895 @echo "$@ requires CC=clang" >&2 1896 @false 1897endif 1898 1899# Scripts to check various things for consistency 1900# --------------------------------------------------------------------------- 1901 1902PHONY += includecheck versioncheck coccicheck export_report 1903 1904includecheck: 1905 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1906 -name '*.[hcS]' -type f -print | sort \ 1907 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1908 1909versioncheck: 1910 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1911 -name '*.[hcS]' -type f -print | sort \ 1912 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1913 1914coccicheck: 1915 $(Q)$(BASH) $(srctree)/scripts/$@ 1916 1917export_report: 1918 $(PERL) $(srctree)/scripts/export_report.pl 1919 1920PHONY += checkstack kernelrelease kernelversion image_name 1921 1922# UML needs a little special treatment here. It wants to use the host 1923# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1924# else wants $(ARCH), including people doing cross-builds, which means 1925# that $(SUBARCH) doesn't work here. 1926ifeq ($(ARCH), um) 1927CHECKSTACK_ARCH := $(SUBARCH) 1928else 1929CHECKSTACK_ARCH := $(ARCH) 1930endif 1931checkstack: 1932 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1933 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1934 1935kernelrelease: 1936 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1937 1938kernelversion: 1939 @echo $(KERNELVERSION) 1940 1941image_name: 1942 @echo $(KBUILD_IMAGE) 1943 1944# Clear a bunch of variables before executing the submake 1945 1946ifeq ($(quiet),silent_) 1947tools_silent=s 1948endif 1949 1950tools/: FORCE 1951 $(Q)mkdir -p $(objtree)/tools 1952 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1953 1954tools/%: FORCE 1955 $(Q)mkdir -p $(objtree)/tools 1956 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1957 1958quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1959 cmd_rmfiles = rm -rf $(rm-files) 1960 1961# Run depmod only if we have System.map and depmod is executable 1962quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1963 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1964 $(KERNELRELEASE) 1965 1966# read saved command lines for existing targets 1967existing-targets := $(wildcard $(sort $(targets))) 1968 1969-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1970 1971endif # config-build 1972endif # mixed-build 1973endif # need-sub-make 1974 1975PHONY += FORCE 1976FORCE: 1977 1978# Declare the contents of the PHONY variable as phony. We keep that 1979# information in a variable so we can use it in if_changed and friends. 1980.PHONY: $(PHONY) 1981