1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 18 4SUBLEVEL = 0 5EXTRAVERSION = -rc4 6NAME = Superb Owl 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 --%,$(MAKEFLAGS))),) 98 quiet=silent_ 99 KBUILD_VERBOSE = 0 100endif 101 102export quiet Q KBUILD_VERBOSE 103 104# Call a source code checker (by default, "sparse") as part of the 105# C compilation. 106# 107# Use 'make C=1' to enable checking of only re-compiled files. 108# Use 'make C=2' to enable checking of *all* source files, regardless 109# of whether they are re-compiled or not. 110# 111# See the file "Documentation/dev-tools/sparse.rst" for more details, 112# including where to get the "sparse" utility. 113 114ifeq ("$(origin C)", "command line") 115 KBUILD_CHECKSRC = $(C) 116endif 117ifndef KBUILD_CHECKSRC 118 KBUILD_CHECKSRC = 0 119endif 120 121export KBUILD_CHECKSRC 122 123# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 124# directory of external module to build. Setting M= takes precedence. 125ifeq ("$(origin M)", "command line") 126 KBUILD_EXTMOD := $(M) 127endif 128 129$(if $(word 2, $(KBUILD_EXTMOD)), \ 130 $(error building multiple external modules is not supported)) 131 132# Remove trailing slashes 133ifneq ($(filter %/, $(KBUILD_EXTMOD)),) 134KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) 135endif 136 137export KBUILD_EXTMOD 138 139# Kbuild will save output files in the current working directory. 140# This does not need to match to the root of the kernel source tree. 141# 142# For example, you can do this: 143# 144# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 145# 146# If you want to save output files in a different location, there are 147# two syntaxes to specify it. 148# 149# 1) O= 150# Use "make O=dir/to/store/output/files/" 151# 152# 2) Set KBUILD_OUTPUT 153# Set the environment variable KBUILD_OUTPUT to point to the output directory. 154# export KBUILD_OUTPUT=dir/to/store/output/files/; make 155# 156# The O= assignment takes precedence over the KBUILD_OUTPUT environment 157# variable. 158 159# Do we want to change the working directory? 160ifeq ("$(origin O)", "command line") 161 KBUILD_OUTPUT := $(O) 162endif 163 164ifneq ($(KBUILD_OUTPUT),) 165# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 166# expand a shell special character '~'. We use a somewhat tedious way here. 167abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 168$(if $(abs_objtree),, \ 169 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 170 171# $(realpath ...) resolves symlinks 172abs_objtree := $(realpath $(abs_objtree)) 173else 174abs_objtree := $(CURDIR) 175endif # ifneq ($(KBUILD_OUTPUT),) 176 177ifeq ($(abs_objtree),$(CURDIR)) 178# Suppress "Entering directory ..." unless we are changing the work directory. 179MAKEFLAGS += --no-print-directory 180else 181need-sub-make := 1 182endif 183 184this-makefile := $(lastword $(MAKEFILE_LIST)) 185abs_srctree := $(realpath $(dir $(this-makefile))) 186 187ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 188$(error source directory cannot contain spaces or colons) 189endif 190 191ifneq ($(abs_srctree),$(abs_objtree)) 192# Look for make include files relative to root of kernel src 193# 194# --included-dir is added for backward compatibility, but you should not rely on 195# it. Please add $(srctree)/ prefix to include Makefiles in the source tree. 196MAKEFLAGS += --include-dir=$(abs_srctree) 197endif 198 199ifneq ($(filter 3.%,$(MAKE_VERSION)),) 200# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 201# We need to invoke sub-make to avoid implicit rules in the top Makefile. 202need-sub-make := 1 203# Cancel implicit rules for this Makefile. 204$(this-makefile): ; 205endif 206 207export abs_srctree abs_objtree 208export sub_make_done := 1 209 210ifeq ($(need-sub-make),1) 211 212PHONY += $(MAKECMDGOALS) __sub-make 213 214$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 215 @: 216 217# Invoke a second make in the output directory, passing relevant variables 218__sub-make: 219 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 220 221endif # need-sub-make 222endif # sub_make_done 223 224# We process the rest of the Makefile if this is the final invocation of make 225ifeq ($(need-sub-make),) 226 227# Do not print "Entering directory ...", 228# but we want to display it when entering to the output directory 229# so that IDEs/editors are able to understand relative filenames. 230MAKEFLAGS += --no-print-directory 231 232ifeq ($(abs_srctree),$(abs_objtree)) 233 # building in the source tree 234 srctree := . 235 building_out_of_srctree := 236else 237 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 238 # building in a subdirectory of the source tree 239 srctree := .. 240 else 241 srctree := $(abs_srctree) 242 endif 243 building_out_of_srctree := 1 244endif 245 246ifneq ($(KBUILD_ABS_SRCTREE),) 247srctree := $(abs_srctree) 248endif 249 250objtree := . 251VPATH := $(srctree) 252 253export building_out_of_srctree srctree objtree VPATH 254 255# To make sure we do not include .config for any of the *config targets 256# catch them early, and hand them over to scripts/kconfig/Makefile 257# It is allowed to specify more targets when calling make, including 258# mixing *config targets and build targets. 259# For example 'make oldconfig all'. 260# Detect when mixed targets is specified, and make a second invocation 261# of make so .config is not included in this case either (for *config). 262 263version_h := include/generated/uapi/linux/version.h 264 265clean-targets := %clean mrproper cleandocs 266no-dot-config-targets := $(clean-targets) \ 267 cscope gtags TAGS tags help% %docs check% coccicheck \ 268 $(version_h) headers headers_% archheaders archscripts \ 269 %asm-generic kernelversion %src-pkg dt_binding_check \ 270 outputmakefile 271# Installation targets should not require compiler. Unfortunately, vdso_install 272# is an exception where build artifacts may be updated. This must be fixed. 273no-compiler-targets := $(no-dot-config-targets) install dtbs_install \ 274 headers_install modules_install kernelrelease image_name 275no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \ 276 image_name 277single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ 278 279config-build := 280mixed-build := 281need-config := 1 282need-compiler := 1 283may-sync-config := 1 284single-build := 285 286ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 287 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 288 need-config := 289 endif 290endif 291 292ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),) 293 ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),) 294 need-compiler := 295 endif 296endif 297 298ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 299 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 300 may-sync-config := 301 endif 302endif 303 304ifneq ($(KBUILD_EXTMOD),) 305 may-sync-config := 306endif 307 308ifeq ($(KBUILD_EXTMOD),) 309 ifneq ($(filter %config,$(MAKECMDGOALS)),) 310 config-build := 1 311 ifneq ($(words $(MAKECMDGOALS)),1) 312 mixed-build := 1 313 endif 314 endif 315endif 316 317# We cannot build single targets and the others at the same time 318ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 319 single-build := 1 320 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 321 mixed-build := 1 322 endif 323endif 324 325# For "make -j clean all", "make -j mrproper defconfig all", etc. 326ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 327 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 328 mixed-build := 1 329 endif 330endif 331 332# install and modules_install need also be processed one by one 333ifneq ($(filter install,$(MAKECMDGOALS)),) 334 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 335 mixed-build := 1 336 endif 337endif 338 339ifdef mixed-build 340# =========================================================================== 341# We're called with mixed targets (*config and build targets). 342# Handle them one by one. 343 344PHONY += $(MAKECMDGOALS) __build_one_by_one 345 346$(MAKECMDGOALS): __build_one_by_one 347 @: 348 349__build_one_by_one: 350 $(Q)set -e; \ 351 for i in $(MAKECMDGOALS); do \ 352 $(MAKE) -f $(srctree)/Makefile $$i; \ 353 done 354 355else # !mixed-build 356 357include $(srctree)/scripts/Kbuild.include 358 359# Read KERNELRELEASE from include/config/kernel.release (if it exists) 360KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 361KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 362export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 363 364include $(srctree)/scripts/subarch.include 365 366# Cross compiling and selecting different set of gcc/bin-utils 367# --------------------------------------------------------------------------- 368# 369# When performing cross compilation for other architectures ARCH shall be set 370# to the target architecture. (See arch/* for the possibilities). 371# ARCH can be set during invocation of make: 372# make ARCH=ia64 373# Another way is to have ARCH set in the environment. 374# The default ARCH is the host where make is executed. 375 376# CROSS_COMPILE specify the prefix used for all executables used 377# during compilation. Only gcc and related bin-utils executables 378# are prefixed with $(CROSS_COMPILE). 379# CROSS_COMPILE can be set on the command line 380# make CROSS_COMPILE=ia64-linux- 381# Alternatively CROSS_COMPILE can be set in the environment. 382# Default value for CROSS_COMPILE is not to prefix executables 383# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 384ARCH ?= $(SUBARCH) 385 386# Architecture as present in compile.h 387UTS_MACHINE := $(ARCH) 388SRCARCH := $(ARCH) 389 390# Additional ARCH settings for x86 391ifeq ($(ARCH),i386) 392 SRCARCH := x86 393endif 394ifeq ($(ARCH),x86_64) 395 SRCARCH := x86 396endif 397 398# Additional ARCH settings for sparc 399ifeq ($(ARCH),sparc32) 400 SRCARCH := sparc 401endif 402ifeq ($(ARCH),sparc64) 403 SRCARCH := sparc 404endif 405 406# Additional ARCH settings for parisc 407ifeq ($(ARCH),parisc64) 408 SRCARCH := parisc 409endif 410 411export cross_compiling := 412ifneq ($(SRCARCH),$(SUBARCH)) 413cross_compiling := 1 414endif 415 416KCONFIG_CONFIG ?= .config 417export KCONFIG_CONFIG 418 419# SHELL used by kbuild 420CONFIG_SHELL := sh 421 422HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 423HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 424HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 425 426ifneq ($(LLVM),) 427ifneq ($(filter %/,$(LLVM)),) 428LLVM_PREFIX := $(LLVM) 429else ifneq ($(filter -%,$(LLVM)),) 430LLVM_SUFFIX := $(LLVM) 431endif 432 433HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 434HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 435else 436HOSTCC = gcc 437HOSTCXX = g++ 438endif 439 440KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 441 -O2 -fomit-frame-pointer -std=gnu11 \ 442 -Wdeclaration-after-statement 443KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 444KBUILD_USERLDFLAGS := $(USERLDFLAGS) 445 446KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 447KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 448KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 449KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 450 451# Make variables (CC, etc...) 452CPP = $(CC) -E 453ifneq ($(LLVM),) 454CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 455LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 456AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 457NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 458OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 459OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 460READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 461STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 462else 463CC = $(CROSS_COMPILE)gcc 464LD = $(CROSS_COMPILE)ld 465AR = $(CROSS_COMPILE)ar 466NM = $(CROSS_COMPILE)nm 467OBJCOPY = $(CROSS_COMPILE)objcopy 468OBJDUMP = $(CROSS_COMPILE)objdump 469READELF = $(CROSS_COMPILE)readelf 470STRIP = $(CROSS_COMPILE)strip 471endif 472PAHOLE = pahole 473RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 474LEX = flex 475YACC = bison 476AWK = awk 477INSTALLKERNEL := installkernel 478DEPMOD = depmod 479PERL = perl 480PYTHON3 = python3 481CHECK = sparse 482BASH = bash 483KGZIP = gzip 484KBZIP2 = bzip2 485KLZOP = lzop 486LZMA = lzma 487LZ4 = lz4c 488XZ = xz 489ZSTD = zstd 490 491PAHOLE_FLAGS = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh) 492 493CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 494 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 495NOSTDINC_FLAGS := 496CFLAGS_MODULE = 497AFLAGS_MODULE = 498LDFLAGS_MODULE = 499CFLAGS_KERNEL = 500AFLAGS_KERNEL = 501LDFLAGS_vmlinux = 502 503# Use USERINCLUDE when you must reference the UAPI directories only. 504USERINCLUDE := \ 505 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 506 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 507 -I$(srctree)/include/uapi \ 508 -I$(objtree)/include/generated/uapi \ 509 -include $(srctree)/include/linux/compiler-version.h \ 510 -include $(srctree)/include/linux/kconfig.h 511 512# Use LINUXINCLUDE when you must reference the include/ directory. 513# Needed to be compatible with the O= option 514LINUXINCLUDE := \ 515 -I$(srctree)/arch/$(SRCARCH)/include \ 516 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 517 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 518 -I$(objtree)/include \ 519 $(USERINCLUDE) 520 521KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 522KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 523 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 524 -Werror=implicit-function-declaration -Werror=implicit-int \ 525 -Werror=return-type -Wno-format-security \ 526 -std=gnu11 527KBUILD_CPPFLAGS := -D__KERNEL__ 528KBUILD_AFLAGS_KERNEL := 529KBUILD_CFLAGS_KERNEL := 530KBUILD_AFLAGS_MODULE := -DMODULE 531KBUILD_CFLAGS_MODULE := -DMODULE 532KBUILD_LDFLAGS_MODULE := 533KBUILD_LDFLAGS := 534CLANG_FLAGS := 535 536export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 537export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 538export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 539export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 540export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 541export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 542 543export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 544export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 545export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 546export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 547export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 548export PAHOLE_FLAGS 549 550# Files to ignore in find ... statements 551 552export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 553 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 554 -prune -o 555export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 556 --exclude CVS --exclude .pc --exclude .hg --exclude .git 557 558# =========================================================================== 559# Rules shared between *config targets and build targets 560 561# Basic helpers built in scripts/basic/ 562PHONY += scripts_basic 563scripts_basic: 564 $(Q)$(MAKE) $(build)=scripts/basic 565 566PHONY += outputmakefile 567ifdef building_out_of_srctree 568# Before starting out-of-tree build, make sure the source tree is clean. 569# outputmakefile generates a Makefile in the output directory, if using a 570# separate output directory. This allows convenient use of make in the 571# output directory. 572# At the same time when output Makefile generated, generate .gitignore to 573# ignore whole output directory 574 575quiet_cmd_makefile = GEN Makefile 576 cmd_makefile = { \ 577 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 578 echo "include $(srctree)/Makefile"; \ 579 } > Makefile 580 581outputmakefile: 582 $(Q)if [ -f $(srctree)/.config -o \ 583 -d $(srctree)/include/config -o \ 584 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 585 echo >&2 "***"; \ 586 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 587 echo >&2 "*** in $(abs_srctree)";\ 588 echo >&2 "***"; \ 589 false; \ 590 fi 591 $(Q)ln -fsn $(srctree) source 592 $(call cmd,makefile) 593 $(Q)test -e .gitignore || \ 594 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 595endif 596 597# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 598# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 599# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 600# and from include/config/auto.conf.cmd to detect the compiler upgrade. 601CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 602 603ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 604include $(srctree)/scripts/Makefile.clang 605endif 606 607# Include this also for config targets because some architectures need 608# cc-cross-prefix to determine CROSS_COMPILE. 609ifdef need-compiler 610include $(srctree)/scripts/Makefile.compiler 611endif 612 613ifdef config-build 614# =========================================================================== 615# *config targets only - make sure prerequisites are updated, and descend 616# in scripts/kconfig to make the *config target 617 618# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 619# KBUILD_DEFCONFIG may point out an alternative default configuration 620# used for 'make defconfig' 621include $(srctree)/arch/$(SRCARCH)/Makefile 622export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 623 624config: outputmakefile scripts_basic FORCE 625 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 626 627%config: outputmakefile scripts_basic FORCE 628 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 629 630else #!config-build 631# =========================================================================== 632# Build targets only - this includes vmlinux, arch specific targets, clean 633# targets and others. In general all targets except *config targets. 634 635# If building an external module we do not care about the all: rule 636# but instead __all depend on modules 637PHONY += all 638ifeq ($(KBUILD_EXTMOD),) 639__all: all 640else 641__all: modules 642endif 643 644# Decide whether to build built-in, modular, or both. 645# Normally, just do built-in. 646 647KBUILD_MODULES := 648KBUILD_BUILTIN := 1 649 650# If we have only "make modules", don't compile built-in objects. 651ifeq ($(MAKECMDGOALS),modules) 652 KBUILD_BUILTIN := 653endif 654 655# If we have "make <whatever> modules", compile modules 656# in addition to whatever we do anyway. 657# Just "make" or "make all" shall build modules as well 658 659ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 660 KBUILD_MODULES := 1 661endif 662 663ifeq ($(MAKECMDGOALS),) 664 KBUILD_MODULES := 1 665endif 666 667export KBUILD_MODULES KBUILD_BUILTIN 668 669ifdef need-config 670include include/config/auto.conf 671endif 672 673ifeq ($(KBUILD_EXTMOD),) 674# Objects we will link into vmlinux / subdirs we need to visit 675core-y := init/ usr/ arch/$(SRCARCH)/ 676drivers-y := drivers/ sound/ 677drivers-$(CONFIG_SAMPLES) += samples/ 678drivers-$(CONFIG_NET) += net/ 679drivers-y += virt/ 680libs-y := lib/ 681endif # KBUILD_EXTMOD 682 683# The all: target is the default when no target is given on the 684# command line. 685# This allow a user to issue only 'make' to build a kernel including modules 686# Defaults to vmlinux, but the arch makefile usually adds further targets 687all: vmlinux 688 689CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 690ifdef CONFIG_CC_IS_GCC 691CFLAGS_GCOV += -fno-tree-loop-im 692endif 693export CFLAGS_GCOV 694 695# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 696ifdef CONFIG_FUNCTION_TRACER 697 CC_FLAGS_FTRACE := -pg 698endif 699 700include $(srctree)/arch/$(SRCARCH)/Makefile 701 702ifdef need-config 703ifdef may-sync-config 704# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 705# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 706# because some architectures define CROSS_COMPILE there. 707include include/config/auto.conf.cmd 708 709$(KCONFIG_CONFIG): 710 @echo >&2 '***' 711 @echo >&2 '*** Configuration file "$@" not found!' 712 @echo >&2 '***' 713 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 714 @echo >&2 '*** "make menuconfig" or "make xconfig").' 715 @echo >&2 '***' 716 @/bin/false 717 718# The actual configuration files used during the build are stored in 719# include/generated/ and include/config/. Update them if .config is newer than 720# include/config/auto.conf (which mirrors .config). 721# 722# This exploits the 'multi-target pattern rule' trick. 723# The syncconfig should be executed only once to make all the targets. 724# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 725# 726# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 727# so you cannot notice that Kconfig is waiting for the user input. 728%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 729 $(Q)$(kecho) " SYNC $@" 730 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 731else # !may-sync-config 732# External modules and some install targets need include/generated/autoconf.h 733# and include/config/auto.conf but do not care if they are up-to-date. 734# Use auto.conf to trigger the test 735PHONY += include/config/auto.conf 736 737include/config/auto.conf: 738 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 739 echo >&2; \ 740 echo >&2 " ERROR: Kernel configuration is invalid."; \ 741 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 742 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 743 echo >&2 ; \ 744 /bin/false) 745 746endif # may-sync-config 747endif # need-config 748 749KBUILD_CFLAGS += -fno-delete-null-pointer-checks 750KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 751KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 752KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 753KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 754 755ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 756KBUILD_CFLAGS += -O2 757else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 758KBUILD_CFLAGS += -O3 759else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 760KBUILD_CFLAGS += -Os 761endif 762 763# Tell gcc to never replace conditional load with a non-conditional one 764ifdef CONFIG_CC_IS_GCC 765# gcc-10 renamed --param=allow-store-data-races=0 to 766# -fno-allow-store-data-races. 767KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 768KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 769endif 770 771ifdef CONFIG_READABLE_ASM 772# Disable optimizations that make assembler listings hard to read. 773# reorder blocks reorders the control in the function 774# ipa clone creates specialized cloned functions 775# partial inlining inlines only parts of functions 776KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 777endif 778 779ifneq ($(CONFIG_FRAME_WARN),0) 780KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 781endif 782 783stackp-flags-y := -fno-stack-protector 784stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 785stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 786 787KBUILD_CFLAGS += $(stackp-flags-y) 788 789KBUILD_CFLAGS-$(CONFIG_WERROR) += -Werror 790KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH) 791 792ifdef CONFIG_CC_IS_CLANG 793KBUILD_CPPFLAGS += -Qunused-arguments 794# The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable. 795KBUILD_CFLAGS += -Wno-gnu 796else 797 798# gcc inanely warns about local variables called 'main' 799KBUILD_CFLAGS += -Wno-main 800endif 801 802# These warnings generated too much noise in a regular build. 803# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 804KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 805KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 806 807ifdef CONFIG_FRAME_POINTER 808KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 809else 810# Some targets (ARM with Thumb2, for example), can't be built with frame 811# pointers. For those, we don't have FUNCTION_TRACER automatically 812# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 813# incompatible with -fomit-frame-pointer with current GCC, so we don't use 814# -fomit-frame-pointer with FUNCTION_TRACER. 815ifndef CONFIG_FUNCTION_TRACER 816KBUILD_CFLAGS += -fomit-frame-pointer 817endif 818endif 819 820# Initialize all stack variables with a 0xAA pattern. 821ifdef CONFIG_INIT_STACK_ALL_PATTERN 822KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 823endif 824 825# Initialize all stack variables with a zero value. 826ifdef CONFIG_INIT_STACK_ALL_ZERO 827KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 828ifdef CONFIG_CC_IS_CLANG 829# https://bugs.llvm.org/show_bug.cgi?id=45497 830KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 831endif 832endif 833 834# While VLAs have been removed, GCC produces unreachable stack probes 835# for the randomize_kstack_offset feature. Disable it for all compilers. 836KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 837 838# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 839ifdef CONFIG_ZERO_CALL_USED_REGS 840KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 841endif 842 843ifdef CONFIG_FUNCTION_TRACER 844ifdef CONFIG_FTRACE_MCOUNT_USE_CC 845 CC_FLAGS_FTRACE += -mrecord-mcount 846 ifdef CONFIG_HAVE_NOP_MCOUNT 847 ifeq ($(call cc-option-yn, -mnop-mcount),y) 848 CC_FLAGS_FTRACE += -mnop-mcount 849 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 850 endif 851 endif 852endif 853ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 854 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 855endif 856ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 857 ifdef CONFIG_HAVE_C_RECORDMCOUNT 858 BUILD_C_RECORDMCOUNT := y 859 export BUILD_C_RECORDMCOUNT 860 endif 861endif 862ifdef CONFIG_HAVE_FENTRY 863 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 864 ifeq ($(call cc-option-yn, -mfentry),y) 865 CC_FLAGS_FTRACE += -mfentry 866 CC_FLAGS_USING += -DCC_USING_FENTRY 867 endif 868endif 869export CC_FLAGS_FTRACE 870KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 871KBUILD_AFLAGS += $(CC_FLAGS_USING) 872endif 873 874# We trigger additional mismatches with less inlining 875ifdef CONFIG_DEBUG_SECTION_MISMATCH 876KBUILD_CFLAGS += -fno-inline-functions-called-once 877endif 878 879ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 880KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 881LDFLAGS_vmlinux += --gc-sections 882endif 883 884ifdef CONFIG_SHADOW_CALL_STACK 885CC_FLAGS_SCS := -fsanitize=shadow-call-stack 886KBUILD_CFLAGS += $(CC_FLAGS_SCS) 887export CC_FLAGS_SCS 888endif 889 890ifdef CONFIG_LTO_CLANG 891ifdef CONFIG_LTO_CLANG_THIN 892CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 893KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache 894else 895CC_FLAGS_LTO := -flto 896endif 897CC_FLAGS_LTO += -fvisibility=hidden 898 899# Limit inlining across translation units to reduce binary size 900KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 901 902# Check for frame size exceeding threshold during prolog/epilog insertion 903# when using lld < 13.0.0. 904ifneq ($(CONFIG_FRAME_WARN),0) 905ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0) 906KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) 907endif 908endif 909endif 910 911ifdef CONFIG_LTO 912KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 913KBUILD_AFLAGS += -fno-lto 914export CC_FLAGS_LTO 915endif 916 917ifdef CONFIG_CFI_CLANG 918CC_FLAGS_CFI := -fsanitize=cfi \ 919 -fsanitize-cfi-cross-dso \ 920 -fno-sanitize-cfi-canonical-jump-tables \ 921 -fno-sanitize-trap=cfi \ 922 -fno-sanitize-blacklist 923 924ifdef CONFIG_CFI_PERMISSIVE 925CC_FLAGS_CFI += -fsanitize-recover=cfi 926endif 927 928# If LTO flags are filtered out, we must also filter out CFI. 929CC_FLAGS_LTO += $(CC_FLAGS_CFI) 930KBUILD_CFLAGS += $(CC_FLAGS_CFI) 931export CC_FLAGS_CFI 932endif 933 934ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B 935KBUILD_CFLAGS += -falign-functions=64 936endif 937 938# arch Makefile may override CC so keep this after arch Makefile is included 939NOSTDINC_FLAGS += -nostdinc 940 941# warn about C99 declaration after statement 942KBUILD_CFLAGS += -Wdeclaration-after-statement 943 944# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 945KBUILD_CFLAGS += -Wvla 946 947# disable pointer signed / unsigned warnings in gcc 4.0 948KBUILD_CFLAGS += -Wno-pointer-sign 949 950# In order to make sure new function cast mismatches are not introduced 951# in the kernel (to avoid tripping CFI checking), the kernel should be 952# globally built with -Wcast-function-type. 953KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type) 954 955# disable stringop warnings in gcc 8+ 956KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 957 958# We'll want to enable this eventually, but it's not going away for 5.7 at least 959KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 960 961# Another good warning that we'll want to enable eventually 962KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 963 964# Enabled with W=2, disabled by default as noisy 965ifdef CONFIG_CC_IS_GCC 966KBUILD_CFLAGS += -Wno-maybe-uninitialized 967endif 968 969ifdef CONFIG_CC_IS_GCC 970# The allocators already balk at large sizes, so silence the compiler 971# warnings for bounds checks involving those possible values. While 972# -Wno-alloc-size-larger-than would normally be used here, earlier versions 973# of gcc (<9.1) weirdly don't handle the option correctly when _other_ 974# warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX 975# doesn't work (as it is documented to), silently resolving to "0" prior to 976# version 9.1 (and producing an error more recently). Numeric values larger 977# than PTRDIFF_MAX also don't work prior to version 9.1, which are silently 978# ignored, continuing to default to PTRDIFF_MAX. So, left with no other 979# choice, we must perform a versioned check to disable this warning. 980# https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au 981KBUILD_CFLAGS += $(call cc-ifversion, -ge, 0901, -Wno-alloc-size-larger-than) 982endif 983 984# disable invalid "can't wrap" optimizations for signed / pointers 985KBUILD_CFLAGS += -fno-strict-overflow 986 987# Make sure -fstack-check isn't enabled (like gentoo apparently did) 988KBUILD_CFLAGS += -fno-stack-check 989 990# conserve stack if available 991ifdef CONFIG_CC_IS_GCC 992KBUILD_CFLAGS += -fconserve-stack 993endif 994 995# Prohibit date/time macros, which would make the build non-deterministic 996KBUILD_CFLAGS += -Werror=date-time 997 998# enforce correct pointer usage 999KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 1000 1001# Require designated initializers for all marked structures 1002KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 1003 1004# change __FILE__ to the relative path from the srctree 1005KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1006 1007# include additional Makefiles when needed 1008include-y := scripts/Makefile.extrawarn 1009include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1010include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1011include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1012include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1013include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1014include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1015 1016include $(addprefix $(srctree)/, $(include-y)) 1017 1018# scripts/Makefile.gcc-plugins is intentionally included last. 1019# Do not add $(call cc-option,...) below this line. When you build the kernel 1020# from the clean source tree, the GCC plugins do not exist at this point. 1021 1022# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 1023KBUILD_CPPFLAGS += $(KCPPFLAGS) 1024KBUILD_AFLAGS += $(KAFLAGS) 1025KBUILD_CFLAGS += $(KCFLAGS) 1026 1027KBUILD_LDFLAGS_MODULE += --build-id=sha1 1028LDFLAGS_vmlinux += --build-id=sha1 1029 1030ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1031LDFLAGS_vmlinux += $(call ld-option, -X,) 1032endif 1033 1034ifeq ($(CONFIG_RELR),y) 1035LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags 1036endif 1037 1038# We never want expected sections to be placed heuristically by the 1039# linker. All sections should be explicitly named in the linker script. 1040ifdef CONFIG_LD_ORPHAN_WARN 1041LDFLAGS_vmlinux += --orphan-handling=warn 1042endif 1043 1044# Align the bit size of userspace programs with the kernel 1045KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1046KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1047 1048# make the checker run with the right architecture 1049CHECKFLAGS += --arch=$(ARCH) 1050 1051# insure the checker run with the right endianness 1052CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1053 1054# the checker needs the correct machine size 1055CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1056 1057# Default kernel image to build when no specific target is given. 1058# KBUILD_IMAGE may be overruled on the command line or 1059# set in the environment 1060# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1061# this default value 1062export KBUILD_IMAGE ?= vmlinux 1063 1064# 1065# INSTALL_PATH specifies where to place the updated kernel and system map 1066# images. Default is /boot, but you can set it to other values 1067export INSTALL_PATH ?= /boot 1068 1069# 1070# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1071# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1072# an argument if needed. Otherwise it defaults to the kernel install path 1073# 1074export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1075 1076# 1077# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1078# relocations required by build roots. This is not defined in the 1079# makefile but the argument can be passed to make if needed. 1080# 1081 1082MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1083export MODLIB 1084 1085PHONY += prepare0 1086 1087export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1088export MODORDER := $(extmod_prefix)modules.order 1089export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1090 1091ifeq ($(KBUILD_EXTMOD),) 1092core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ 1093core-$(CONFIG_BLOCK) += block/ 1094 1095vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1096 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1097 $(libs-y) $(libs-m))) 1098 1099vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1100 $(patsubst %/,%,$(filter %/, $(core-) \ 1101 $(drivers-) $(libs-)))) 1102 1103subdir-modorder := $(addsuffix modules.order,$(filter %/, \ 1104 $(core-y) $(core-m) $(libs-y) $(libs-m) \ 1105 $(drivers-y) $(drivers-m))) 1106 1107build-dirs := $(vmlinux-dirs) 1108clean-dirs := $(vmlinux-alldirs) 1109 1110# Externally visible symbols (used by link-vmlinux.sh) 1111KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1112KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1113ifdef CONFIG_MODULES 1114KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1115KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1116else 1117KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1118endif 1119KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1120 1121export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1122export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1123# used by scripts/Makefile.package 1124export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1125 1126vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1127 1128# Recurse until adjust_autoksyms.sh is satisfied 1129PHONY += autoksyms_recursive 1130ifdef CONFIG_TRIM_UNUSED_KSYMS 1131# For the kernel to actually contain only the needed exported symbols, 1132# we have to build modules as well to determine what those symbols are. 1133# (this can be evaluated only once include/config/auto.conf has been included) 1134KBUILD_MODULES := 1 1135 1136autoksyms_recursive: descend modules.order 1137 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1138 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1139endif 1140 1141autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1142 1143quiet_cmd_autoksyms_h = GEN $@ 1144 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1145 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1146 1147$(autoksyms_h): 1148 $(call cmd,autoksyms_h) 1149 1150ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1151 1152# Final link of vmlinux with optional arch pass after final link 1153cmd_link-vmlinux = \ 1154 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \ 1155 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1156 1157vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1158 +$(call if_changed_dep,link-vmlinux) 1159 1160targets := vmlinux 1161 1162# The actual objects are generated when descending, 1163# make sure no implicit rule kicks in 1164$(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1165 1166filechk_kernel.release = \ 1167 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1168 1169# Store (new) KERNELRELEASE string in include/config/kernel.release 1170include/config/kernel.release: FORCE 1171 $(call filechk,kernel.release) 1172 1173# Additional helpers built in scripts/ 1174# Carefully list dependencies so we do not try to build scripts twice 1175# in parallel 1176PHONY += scripts 1177scripts: scripts_basic scripts_dtc 1178 $(Q)$(MAKE) $(build)=$(@) 1179 1180# Things we need to do before we recursively start building the kernel 1181# or the modules are listed in "prepare". 1182# A multi level approach is used. prepareN is processed before prepareN-1. 1183# archprepare is used in arch Makefiles and when processed asm symlink, 1184# version.h and scripts_basic is processed / created. 1185 1186PHONY += prepare archprepare 1187 1188archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1189 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1190 include/generated/autoconf.h remove-stale-files 1191 1192prepare0: archprepare 1193 $(Q)$(MAKE) $(build)=scripts/mod 1194 $(Q)$(MAKE) $(build)=. 1195 1196# All the preparing.. 1197prepare: prepare0 1198 1199PHONY += remove-stale-files 1200remove-stale-files: 1201 $(Q)$(srctree)/scripts/remove-stale-files 1202 1203# Support for using generic headers in asm-generic 1204asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1205 1206PHONY += asm-generic uapi-asm-generic 1207asm-generic: uapi-asm-generic 1208 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1209 generic=include/asm-generic 1210uapi-asm-generic: 1211 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1212 generic=include/uapi/asm-generic 1213 1214# Generate some files 1215# --------------------------------------------------------------------------- 1216 1217# KERNELRELEASE can change from a few different places, meaning version.h 1218# needs to be updated, so this check is forced on all builds 1219 1220uts_len := 64 1221define filechk_utsrelease.h 1222 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1223 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1224 exit 1; \ 1225 fi; \ 1226 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1227endef 1228 1229define filechk_version.h 1230 if [ $(SUBLEVEL) -gt 255 ]; then \ 1231 echo \#define LINUX_VERSION_CODE $(shell \ 1232 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1233 else \ 1234 echo \#define LINUX_VERSION_CODE $(shell \ 1235 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1236 fi; \ 1237 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1238 ((c) > 255 ? 255 : (c)))'; \ 1239 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1240 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1241 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1242endef 1243 1244$(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1245$(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0) 1246$(version_h): FORCE 1247 $(call filechk,version.h) 1248 1249include/generated/utsrelease.h: include/config/kernel.release FORCE 1250 $(call filechk,utsrelease.h) 1251 1252PHONY += headerdep 1253headerdep: 1254 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1255 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1256 1257# --------------------------------------------------------------------------- 1258# Kernel headers 1259 1260#Default location for installed headers 1261export INSTALL_HDR_PATH = $(objtree)/usr 1262 1263quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1264 cmd_headers_install = \ 1265 mkdir -p $(INSTALL_HDR_PATH); \ 1266 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1267 usr/include $(INSTALL_HDR_PATH) 1268 1269PHONY += headers_install 1270headers_install: headers 1271 $(call cmd,headers_install) 1272 1273PHONY += archheaders archscripts 1274 1275hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1276 1277PHONY += headers 1278headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1279 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1280 $(error Headers not exportable for the $(SRCARCH) architecture)) 1281 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1282 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1283 1284ifdef CONFIG_HEADERS_INSTALL 1285prepare: headers 1286endif 1287 1288PHONY += scripts_unifdef 1289scripts_unifdef: scripts_basic 1290 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1291 1292# --------------------------------------------------------------------------- 1293# Install 1294 1295# Many distributions have the custom install script, /sbin/installkernel. 1296# If DKMS is installed, 'make install' will eventually recuses back 1297# to the this Makefile to build and install external modules. 1298# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1299 1300install: sub_make_done := 1301 1302# --------------------------------------------------------------------------- 1303# Tools 1304 1305ifdef CONFIG_STACK_VALIDATION 1306prepare: tools/objtool 1307endif 1308 1309ifdef CONFIG_BPF 1310ifdef CONFIG_DEBUG_INFO_BTF 1311prepare: tools/bpf/resolve_btfids 1312endif 1313endif 1314 1315PHONY += resolve_btfids_clean 1316 1317resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1318 1319# tools/bpf/resolve_btfids directory might not exist 1320# in output directory, skip its clean in that case 1321resolve_btfids_clean: 1322ifneq ($(wildcard $(resolve_btfids_O)),) 1323 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1324endif 1325 1326# Clear a bunch of variables before executing the submake 1327ifeq ($(quiet),silent_) 1328tools_silent=s 1329endif 1330 1331tools/: FORCE 1332 $(Q)mkdir -p $(objtree)/tools 1333 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1334 1335tools/%: FORCE 1336 $(Q)mkdir -p $(objtree)/tools 1337 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1338 1339# --------------------------------------------------------------------------- 1340# Kernel selftest 1341 1342PHONY += kselftest 1343kselftest: 1344 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1345 1346kselftest-%: FORCE 1347 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1348 1349PHONY += kselftest-merge 1350kselftest-merge: 1351 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1352 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1353 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1354 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1355 1356# --------------------------------------------------------------------------- 1357# Devicetree files 1358 1359ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1360dtstree := arch/$(SRCARCH)/boot/dts 1361endif 1362 1363ifneq ($(dtstree),) 1364 1365%.dtb: include/config/kernel.release scripts_dtc 1366 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1367 1368%.dtbo: include/config/kernel.release scripts_dtc 1369 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1370 1371PHONY += dtbs dtbs_install dtbs_check 1372dtbs: include/config/kernel.release scripts_dtc 1373 $(Q)$(MAKE) $(build)=$(dtstree) 1374 1375ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1376export CHECK_DTBS=y 1377dtbs: dt_binding_check 1378endif 1379 1380dtbs_check: dtbs 1381 1382dtbs_install: 1383 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1384 1385ifdef CONFIG_OF_EARLY_FLATTREE 1386all: dtbs 1387endif 1388 1389endif 1390 1391PHONY += scripts_dtc 1392scripts_dtc: scripts_basic 1393 $(Q)$(MAKE) $(build)=scripts/dtc 1394 1395ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1396export CHECK_DT_BINDING=y 1397endif 1398 1399PHONY += dt_binding_check 1400dt_binding_check: scripts_dtc 1401 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1402 1403# --------------------------------------------------------------------------- 1404# Modules 1405 1406ifdef CONFIG_MODULES 1407 1408# By default, build modules as well 1409 1410all: modules 1411 1412# When we're building modules with modversions, we need to consider 1413# the built-in objects during the descend as well, in order to 1414# make sure the checksums are up to date before we record them. 1415ifdef CONFIG_MODVERSIONS 1416 KBUILD_BUILTIN := 1 1417endif 1418 1419# Build modules 1420# 1421# A module can be listed more than once in obj-m resulting in 1422# duplicate lines in modules.order files. Those are removed 1423# using awk while concatenating to the final file. 1424 1425PHONY += modules 1426modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare 1427 1428cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1429 1430modules.order: $(subdir-modorder) FORCE 1431 $(call if_changed,modules_order) 1432 1433targets += modules.order 1434 1435# Target to prepare building external modules 1436PHONY += modules_prepare 1437modules_prepare: prepare 1438 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1439 1440export modules_sign_only := 1441 1442ifeq ($(CONFIG_MODULE_SIG),y) 1443PHONY += modules_sign 1444modules_sign: modules_install 1445 @: 1446 1447# modules_sign is a subset of modules_install. 1448# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1449ifeq ($(filter modules_install,$(MAKECMDGOALS)),) 1450modules_sign_only := y 1451endif 1452endif 1453 1454modinst_pre := 1455ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 1456modinst_pre := __modinst_pre 1457endif 1458 1459modules_install: $(modinst_pre) 1460PHONY += __modinst_pre 1461__modinst_pre: 1462 @rm -rf $(MODLIB)/kernel 1463 @rm -f $(MODLIB)/source 1464 @mkdir -p $(MODLIB)/kernel 1465 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1466 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1467 rm -f $(MODLIB)/build ; \ 1468 ln -s $(CURDIR) $(MODLIB)/build ; \ 1469 fi 1470 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1471 @cp -f modules.builtin $(MODLIB)/ 1472 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1473 1474endif # CONFIG_MODULES 1475 1476### 1477# Cleaning is done on three levels. 1478# make clean Delete most generated files 1479# Leave enough to build external modules 1480# make mrproper Delete the current configuration, and all generated files 1481# make distclean Remove editor backup files, patch leftover files and the like 1482 1483# Directories & files removed with 'make clean' 1484CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ 1485 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1486 compile_commands.json .thinlto-cache 1487 1488# Directories & files removed with 'make mrproper' 1489MRPROPER_FILES += include/config include/generated \ 1490 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1491 debian snap tar-install \ 1492 .config .config.old .version \ 1493 Module.symvers \ 1494 certs/signing_key.pem \ 1495 certs/x509.genkey \ 1496 vmlinux-gdb.py \ 1497 *.spec 1498 1499# clean - Delete most, but leave enough to build external modules 1500# 1501clean: rm-files := $(CLEAN_FILES) 1502 1503PHONY += archclean vmlinuxclean 1504 1505vmlinuxclean: 1506 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1507 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1508 1509clean: archclean vmlinuxclean resolve_btfids_clean 1510 1511# mrproper - Delete all generated files, including .config 1512# 1513mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1514mrproper-dirs := $(addprefix _mrproper_,scripts) 1515 1516PHONY += $(mrproper-dirs) mrproper 1517$(mrproper-dirs): 1518 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1519 1520mrproper: clean $(mrproper-dirs) 1521 $(call cmd,rmfiles) 1522 1523# distclean 1524# 1525PHONY += distclean 1526 1527distclean: mrproper 1528 @find . $(RCS_FIND_IGNORE) \ 1529 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1530 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1531 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1532 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1533 -type f -print | xargs rm -f 1534 1535 1536# Packaging of the kernel to various formats 1537# --------------------------------------------------------------------------- 1538 1539%src-pkg: FORCE 1540 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1541%pkg: include/config/kernel.release FORCE 1542 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1543 1544# Brief documentation of the typical targets used 1545# --------------------------------------------------------------------------- 1546 1547boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1548boards := $(sort $(notdir $(boards))) 1549board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1550board-dirs := $(sort $(notdir $(board-dirs:/=))) 1551 1552PHONY += help 1553help: 1554 @echo 'Cleaning targets:' 1555 @echo ' clean - Remove most generated files but keep the config and' 1556 @echo ' enough build support to build external modules' 1557 @echo ' mrproper - Remove all generated files + config + various backup files' 1558 @echo ' distclean - mrproper + remove editor backup and patch files' 1559 @echo '' 1560 @echo 'Configuration targets:' 1561 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1562 @echo '' 1563 @echo 'Other generic targets:' 1564 @echo ' all - Build all targets marked with [*]' 1565 @echo '* vmlinux - Build the bare kernel' 1566 @echo '* modules - Build all modules' 1567 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1568 @echo ' dir/ - Build all files in dir and below' 1569 @echo ' dir/file.[ois] - Build specified target only' 1570 @echo ' dir/file.ll - Build the LLVM assembly file' 1571 @echo ' (requires compiler support for LLVM assembly generation)' 1572 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1573 @echo ' (requires a recent binutils and recent build (System.map))' 1574 @echo ' dir/file.ko - Build module including final link' 1575 @echo ' modules_prepare - Set up for building external modules' 1576 @echo ' tags/TAGS - Generate tags file for editors' 1577 @echo ' cscope - Generate cscope index' 1578 @echo ' gtags - Generate GNU GLOBAL index' 1579 @echo ' kernelrelease - Output the release version string (use with make -s)' 1580 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1581 @echo ' image_name - Output the image name (use with make -s)' 1582 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1583 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1584 echo '' 1585 @echo 'Static analysers:' 1586 @echo ' checkstack - Generate a list of stack hogs' 1587 @echo ' versioncheck - Sanity check on version.h usage' 1588 @echo ' includecheck - Check for duplicate included header files' 1589 @echo ' export_report - List the usages of all exported symbols' 1590 @echo ' headerdep - Detect inclusion cycles in headers' 1591 @echo ' coccicheck - Check with Coccinelle' 1592 @echo ' clang-analyzer - Check with clang static analyzer' 1593 @echo ' clang-tidy - Check with clang-tidy' 1594 @echo '' 1595 @echo 'Tools:' 1596 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1597 @echo '' 1598 @echo 'Kernel selftest:' 1599 @echo ' kselftest - Build and run kernel selftest' 1600 @echo ' Build, install, and boot kernel before' 1601 @echo ' running kselftest on it' 1602 @echo ' Run as root for full coverage' 1603 @echo ' kselftest-all - Build kernel selftest' 1604 @echo ' kselftest-install - Build and install kernel selftest' 1605 @echo ' kselftest-clean - Remove all generated kselftest files' 1606 @echo ' kselftest-merge - Merge all the config dependencies of' 1607 @echo ' kselftest to existing .config.' 1608 @echo '' 1609 @$(if $(dtstree), \ 1610 echo 'Devicetree:'; \ 1611 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1612 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1613 echo ' dt_binding_check - Validate device tree binding documents'; \ 1614 echo ' dtbs_check - Validate device tree source files';\ 1615 echo '') 1616 1617 @echo 'Userspace tools targets:' 1618 @echo ' use "make tools/help"' 1619 @echo ' or "cd tools; make help"' 1620 @echo '' 1621 @echo 'Kernel packaging:' 1622 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1623 @echo '' 1624 @echo 'Documentation targets:' 1625 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1626 @echo '' 1627 @echo 'Architecture specific targets ($(SRCARCH)):' 1628 @$(or $(archhelp),\ 1629 echo ' No architecture specific help defined for $(SRCARCH)') 1630 @echo '' 1631 @$(if $(boards), \ 1632 $(foreach b, $(boards), \ 1633 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1634 echo '') 1635 @$(if $(board-dirs), \ 1636 $(foreach b, $(board-dirs), \ 1637 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1638 printf " %-16s - Show all of the above\\n" help-boards; \ 1639 echo '') 1640 1641 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1642 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1643 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1644 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1645 @echo ' (sparse by default)' 1646 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1647 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1648 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1649 @echo ' 1: warnings which may be relevant and do not occur too often' 1650 @echo ' 2: warnings which occur quite often but may still be relevant' 1651 @echo ' 3: more obscure warnings, can most likely be ignored' 1652 @echo ' Multiple levels can be combined with W=12 or W=123' 1653 @echo '' 1654 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1655 @echo 'For further info see the ./README file' 1656 1657 1658help-board-dirs := $(addprefix help-,$(board-dirs)) 1659 1660help-boards: $(help-board-dirs) 1661 1662boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1663 1664$(help-board-dirs): help-%: 1665 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1666 @$(if $(boards-per-dir), \ 1667 $(foreach b, $(boards-per-dir), \ 1668 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1669 echo '') 1670 1671 1672# Documentation targets 1673# --------------------------------------------------------------------------- 1674DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1675 linkcheckdocs dochelp refcheckdocs 1676PHONY += $(DOC_TARGETS) 1677$(DOC_TARGETS): 1678 $(Q)$(MAKE) $(build)=Documentation $@ 1679 1680# Misc 1681# --------------------------------------------------------------------------- 1682 1683PHONY += scripts_gdb 1684scripts_gdb: prepare0 1685 $(Q)$(MAKE) $(build)=scripts/gdb 1686 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1687 1688ifdef CONFIG_GDB_SCRIPTS 1689all: scripts_gdb 1690endif 1691 1692else # KBUILD_EXTMOD 1693 1694### 1695# External module support. 1696# When building external modules the kernel used as basis is considered 1697# read-only, and no consistency checks are made and the make 1698# system is not used on the basis kernel. If updates are required 1699# in the basis kernel ordinary make commands (without M=...) must be used. 1700 1701# We are always building only modules. 1702KBUILD_BUILTIN := 1703KBUILD_MODULES := 1 1704 1705build-dirs := $(KBUILD_EXTMOD) 1706$(MODORDER): descend 1707 @: 1708 1709compile_commands.json: $(extmod_prefix)compile_commands.json 1710PHONY += compile_commands.json 1711 1712clean-dirs := $(KBUILD_EXTMOD) 1713clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1714 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1715 1716PHONY += prepare 1717# now expand this into a simple variable to reduce the cost of shell evaluations 1718prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1719prepare: 1720 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1721 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1722 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1723 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1724 fi 1725 1726PHONY += help 1727help: 1728 @echo ' Building external modules.' 1729 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1730 @echo '' 1731 @echo ' modules - default target, build the module(s)' 1732 @echo ' modules_install - install the module' 1733 @echo ' clean - remove generated files in module directory only' 1734 @echo '' 1735 1736# no-op for external module builds 1737PHONY += modules_prepare 1738 1739endif # KBUILD_EXTMOD 1740 1741# --------------------------------------------------------------------------- 1742# Modules 1743 1744PHONY += modules modules_install 1745 1746ifdef CONFIG_MODULES 1747 1748modules: modules_check 1749 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1750 1751PHONY += modules_check 1752modules_check: $(MODORDER) 1753 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1754 1755quiet_cmd_depmod = DEPMOD $(MODLIB) 1756 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1757 $(KERNELRELEASE) 1758 1759modules_install: 1760 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1761 $(call cmd,depmod) 1762 1763else # CONFIG_MODULES 1764 1765# Modules not configured 1766# --------------------------------------------------------------------------- 1767 1768modules modules_install: 1769 @echo >&2 '***' 1770 @echo >&2 '*** The present kernel configuration has modules disabled.' 1771 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.' 1772 @echo >&2 '*** to enable CONFIG_MODULES.' 1773 @echo >&2 '***' 1774 @exit 1 1775 1776endif # CONFIG_MODULES 1777 1778# Single targets 1779# --------------------------------------------------------------------------- 1780# To build individual files in subdirectories, you can do like this: 1781# 1782# make foo/bar/baz.s 1783# 1784# The supported suffixes for single-target are listed in 'single-targets' 1785# 1786# To build only under specific subdirectories, you can do like this: 1787# 1788# make foo/bar/baz/ 1789 1790ifdef single-build 1791 1792# .ko is special because modpost is needed 1793single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1794single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1795 1796$(single-ko): single_modpost 1797 @: 1798$(single-no-ko): descend 1799 @: 1800 1801ifeq ($(KBUILD_EXTMOD),) 1802# For the single build of in-tree modules, use a temporary file to avoid 1803# the situation of modules_install installing an invalid modules.order. 1804MODORDER := .modules.tmp 1805endif 1806 1807PHONY += single_modpost 1808single_modpost: $(single-no-ko) modules_prepare 1809 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER) 1810 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1811 1812KBUILD_MODULES := 1 1813 1814export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod_prefix), $(single-no-ko)) 1815 1816# trim unrelated directories 1817build-dirs := $(foreach d, $(build-dirs), \ 1818 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1819 1820endif 1821 1822ifndef CONFIG_MODULES 1823KBUILD_MODULES := 1824endif 1825 1826# Handle descending into subdirectories listed in $(build-dirs) 1827# Preset locale variables to speed up the build process. Limit locale 1828# tweaks to this spot to avoid wrong language settings when running 1829# make menuconfig etc. 1830# Error messages still appears in the original language 1831PHONY += descend $(build-dirs) 1832descend: $(build-dirs) 1833$(build-dirs): prepare 1834 $(Q)$(MAKE) $(build)=$@ \ 1835 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ 1836 need-builtin=1 need-modorder=1 1837 1838clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1839PHONY += $(clean-dirs) clean 1840$(clean-dirs): 1841 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1842 1843clean: $(clean-dirs) 1844 $(call cmd,rmfiles) 1845 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1846 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1847 -o -name '*.ko.*' \ 1848 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1849 -o -name '*.dwo' -o -name '*.lst' \ 1850 -o -name '*.su' -o -name '*.mod' \ 1851 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1852 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1853 -o -name '*.asn1.[ch]' \ 1854 -o -name '*.symtypes' -o -name 'modules.order' \ 1855 -o -name '.tmp_*.o.*' \ 1856 -o -name '*.c.[012]*.*' \ 1857 -o -name '*.ll' \ 1858 -o -name '*.gcno' \ 1859 -o -name '*.*.symversions' \) -type f -print | xargs rm -f 1860 1861# Generate tags for editors 1862# --------------------------------------------------------------------------- 1863quiet_cmd_tags = GEN $@ 1864 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1865 1866tags TAGS cscope gtags: FORCE 1867 $(call cmd,tags) 1868 1869# Script to generate missing namespace dependencies 1870# --------------------------------------------------------------------------- 1871 1872PHONY += nsdeps 1873nsdeps: export KBUILD_NSDEPS=1 1874nsdeps: modules 1875 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1876 1877# Clang Tooling 1878# --------------------------------------------------------------------------- 1879 1880quiet_cmd_gen_compile_commands = GEN $@ 1881 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1882 1883$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1884 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \ 1885 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1886 $(call if_changed,gen_compile_commands) 1887 1888targets += $(extmod_prefix)compile_commands.json 1889 1890PHONY += clang-tidy clang-analyzer 1891 1892ifdef CONFIG_CC_IS_CLANG 1893quiet_cmd_clang_tools = CHECK $< 1894 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1895 1896clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 1897 $(call cmd,clang_tools) 1898else 1899clang-tidy clang-analyzer: 1900 @echo "$@ requires CC=clang" >&2 1901 @false 1902endif 1903 1904# Scripts to check various things for consistency 1905# --------------------------------------------------------------------------- 1906 1907PHONY += includecheck versioncheck coccicheck export_report 1908 1909includecheck: 1910 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1911 -name '*.[hcS]' -type f -print | sort \ 1912 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1913 1914versioncheck: 1915 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1916 -name '*.[hcS]' -type f -print | sort \ 1917 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1918 1919coccicheck: 1920 $(Q)$(BASH) $(srctree)/scripts/$@ 1921 1922export_report: 1923 $(PERL) $(srctree)/scripts/export_report.pl 1924 1925PHONY += checkstack kernelrelease kernelversion image_name 1926 1927# UML needs a little special treatment here. It wants to use the host 1928# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1929# else wants $(ARCH), including people doing cross-builds, which means 1930# that $(SUBARCH) doesn't work here. 1931ifeq ($(ARCH), um) 1932CHECKSTACK_ARCH := $(SUBARCH) 1933else 1934CHECKSTACK_ARCH := $(ARCH) 1935endif 1936checkstack: 1937 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1938 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1939 1940kernelrelease: 1941 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1942 1943kernelversion: 1944 @echo $(KERNELVERSION) 1945 1946image_name: 1947 @echo $(KBUILD_IMAGE) 1948 1949quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1950 cmd_rmfiles = rm -rf $(rm-files) 1951 1952# read saved command lines for existing targets 1953existing-targets := $(wildcard $(sort $(targets))) 1954 1955-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1956 1957endif # config-build 1958endif # mixed-build 1959endif # need-sub-make 1960 1961PHONY += FORCE 1962FORCE: 1963 1964# Declare the contents of the PHONY variable as phony. We keep that 1965# information in a variable so we can use it in if_changed and friends. 1966.PHONY: $(PHONY) 1967