1# SPDX-License-Identifier: GPL-2.0 2VERSION = 6 3PATCHLEVEL = 0 4SUBLEVEL = 0 5EXTRAVERSION = -rc7 6NAME = Hurr durr I'ma ninja sloth 7 8# *DOCUMENTATION* 9# To see a list of typical targets execute "make help" 10# More info can be located in ./README 11# Comments in this file are targeted only to the developer, do not 12# expect to learn how to build the kernel reading this file. 13 14$(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 $(error building multiple external modules is not supported)) 131 132$(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \ 133 $(error module directory path cannot contain '$x'))) 134 135# Remove trailing slashes 136ifneq ($(filter %/, $(KBUILD_EXTMOD)),) 137KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) 138endif 139 140export KBUILD_EXTMOD 141 142# Kbuild will save output files in the current working directory. 143# This does not need to match to the root of the kernel source tree. 144# 145# For example, you can do this: 146# 147# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 148# 149# If you want to save output files in a different location, there are 150# two syntaxes to specify it. 151# 152# 1) O= 153# Use "make O=dir/to/store/output/files/" 154# 155# 2) Set KBUILD_OUTPUT 156# Set the environment variable KBUILD_OUTPUT to point to the output directory. 157# export KBUILD_OUTPUT=dir/to/store/output/files/; make 158# 159# The O= assignment takes precedence over the KBUILD_OUTPUT environment 160# variable. 161 162# Do we want to change the working directory? 163ifeq ("$(origin O)", "command line") 164 KBUILD_OUTPUT := $(O) 165endif 166 167ifneq ($(KBUILD_OUTPUT),) 168# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 169# expand a shell special character '~'. We use a somewhat tedious way here. 170abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 171$(if $(abs_objtree),, \ 172 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 173 174# $(realpath ...) resolves symlinks 175abs_objtree := $(realpath $(abs_objtree)) 176else 177abs_objtree := $(CURDIR) 178endif # ifneq ($(KBUILD_OUTPUT),) 179 180ifeq ($(abs_objtree),$(CURDIR)) 181# Suppress "Entering directory ..." unless we are changing the work directory. 182MAKEFLAGS += --no-print-directory 183else 184need-sub-make := 1 185endif 186 187this-makefile := $(lastword $(MAKEFILE_LIST)) 188abs_srctree := $(realpath $(dir $(this-makefile))) 189 190ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 191$(error source directory cannot contain spaces or colons) 192endif 193 194ifneq ($(abs_srctree),$(abs_objtree)) 195# Look for make include files relative to root of kernel src 196# 197# --included-dir is added for backward compatibility, but you should not rely on 198# it. Please add $(srctree)/ prefix to include Makefiles in the source tree. 199MAKEFLAGS += --include-dir=$(abs_srctree) 200endif 201 202ifneq ($(filter 3.%,$(MAKE_VERSION)),) 203# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 204# We need to invoke sub-make to avoid implicit rules in the top Makefile. 205need-sub-make := 1 206# Cancel implicit rules for this Makefile. 207$(this-makefile): ; 208endif 209 210export abs_srctree abs_objtree 211export sub_make_done := 1 212 213ifeq ($(need-sub-make),1) 214 215PHONY += $(MAKECMDGOALS) __sub-make 216 217$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 218 @: 219 220# Invoke a second make in the output directory, passing relevant variables 221__sub-make: 222 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 223 224endif # need-sub-make 225endif # sub_make_done 226 227# We process the rest of the Makefile if this is the final invocation of make 228ifeq ($(need-sub-make),) 229 230# Do not print "Entering directory ...", 231# but we want to display it when entering to the output directory 232# so that IDEs/editors are able to understand relative filenames. 233MAKEFLAGS += --no-print-directory 234 235ifeq ($(abs_srctree),$(abs_objtree)) 236 # building in the source tree 237 srctree := . 238 building_out_of_srctree := 239else 240 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 241 # building in a subdirectory of the source tree 242 srctree := .. 243 else 244 srctree := $(abs_srctree) 245 endif 246 building_out_of_srctree := 1 247endif 248 249ifneq ($(KBUILD_ABS_SRCTREE),) 250srctree := $(abs_srctree) 251endif 252 253objtree := . 254VPATH := $(srctree) 255 256export building_out_of_srctree srctree objtree VPATH 257 258# To make sure we do not include .config for any of the *config targets 259# catch them early, and hand them over to scripts/kconfig/Makefile 260# It is allowed to specify more targets when calling make, including 261# mixing *config targets and build targets. 262# For example 'make oldconfig all'. 263# Detect when mixed targets is specified, and make a second invocation 264# of make so .config is not included in this case either (for *config). 265 266version_h := include/generated/uapi/linux/version.h 267 268clean-targets := %clean mrproper cleandocs 269no-dot-config-targets := $(clean-targets) \ 270 cscope gtags TAGS tags help% %docs check% coccicheck \ 271 $(version_h) headers headers_% archheaders archscripts \ 272 %asm-generic kernelversion %src-pkg dt_binding_check \ 273 outputmakefile 274# Installation targets should not require compiler. Unfortunately, vdso_install 275# is an exception where build artifacts may be updated. This must be fixed. 276no-compiler-targets := $(no-dot-config-targets) install dtbs_install \ 277 headers_install modules_install kernelrelease image_name 278no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \ 279 image_name 280single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ 281 282config-build := 283mixed-build := 284need-config := 1 285need-compiler := 1 286may-sync-config := 1 287single-build := 288 289ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 290 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 291 need-config := 292 endif 293endif 294 295ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),) 296 ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),) 297 need-compiler := 298 endif 299endif 300 301ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 302 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 303 may-sync-config := 304 endif 305endif 306 307ifneq ($(KBUILD_EXTMOD),) 308 may-sync-config := 309endif 310 311ifeq ($(KBUILD_EXTMOD),) 312 ifneq ($(filter %config,$(MAKECMDGOALS)),) 313 config-build := 1 314 ifneq ($(words $(MAKECMDGOALS)),1) 315 mixed-build := 1 316 endif 317 endif 318endif 319 320# We cannot build single targets and the others at the same time 321ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 322 single-build := 1 323 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 324 mixed-build := 1 325 endif 326endif 327 328# For "make -j clean all", "make -j mrproper defconfig all", etc. 329ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 330 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 331 mixed-build := 1 332 endif 333endif 334 335# install and modules_install need also be processed one by one 336ifneq ($(filter install,$(MAKECMDGOALS)),) 337 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 338 mixed-build := 1 339 endif 340endif 341 342ifdef mixed-build 343# =========================================================================== 344# We're called with mixed targets (*config and build targets). 345# Handle them one by one. 346 347PHONY += $(MAKECMDGOALS) __build_one_by_one 348 349$(MAKECMDGOALS): __build_one_by_one 350 @: 351 352__build_one_by_one: 353 $(Q)set -e; \ 354 for i in $(MAKECMDGOALS); do \ 355 $(MAKE) -f $(srctree)/Makefile $$i; \ 356 done 357 358else # !mixed-build 359 360include $(srctree)/scripts/Kbuild.include 361 362# Read KERNELRELEASE from include/config/kernel.release (if it exists) 363KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 364KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 365export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 366 367include $(srctree)/scripts/subarch.include 368 369# Cross compiling and selecting different set of gcc/bin-utils 370# --------------------------------------------------------------------------- 371# 372# When performing cross compilation for other architectures ARCH shall be set 373# to the target architecture. (See arch/* for the possibilities). 374# ARCH can be set during invocation of make: 375# make ARCH=ia64 376# Another way is to have ARCH set in the environment. 377# The default ARCH is the host where make is executed. 378 379# CROSS_COMPILE specify the prefix used for all executables used 380# during compilation. Only gcc and related bin-utils executables 381# are prefixed with $(CROSS_COMPILE). 382# CROSS_COMPILE can be set on the command line 383# make CROSS_COMPILE=ia64-linux- 384# Alternatively CROSS_COMPILE can be set in the environment. 385# Default value for CROSS_COMPILE is not to prefix executables 386# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 387ARCH ?= $(SUBARCH) 388 389# Architecture as present in compile.h 390UTS_MACHINE := $(ARCH) 391SRCARCH := $(ARCH) 392 393# Additional ARCH settings for x86 394ifeq ($(ARCH),i386) 395 SRCARCH := x86 396endif 397ifeq ($(ARCH),x86_64) 398 SRCARCH := x86 399endif 400 401# Additional ARCH settings for sparc 402ifeq ($(ARCH),sparc32) 403 SRCARCH := sparc 404endif 405ifeq ($(ARCH),sparc64) 406 SRCARCH := sparc 407endif 408 409# Additional ARCH settings for parisc 410ifeq ($(ARCH),parisc64) 411 SRCARCH := parisc 412endif 413 414export cross_compiling := 415ifneq ($(SRCARCH),$(SUBARCH)) 416cross_compiling := 1 417endif 418 419KCONFIG_CONFIG ?= .config 420export KCONFIG_CONFIG 421 422# SHELL used by kbuild 423CONFIG_SHELL := sh 424 425HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 426HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 427HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 428 429ifneq ($(LLVM),) 430ifneq ($(filter %/,$(LLVM)),) 431LLVM_PREFIX := $(LLVM) 432else ifneq ($(filter -%,$(LLVM)),) 433LLVM_SUFFIX := $(LLVM) 434endif 435 436HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 437HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) 438else 439HOSTCC = gcc 440HOSTCXX = g++ 441endif 442HOSTPKG_CONFIG = pkg-config 443 444KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 445 -O2 -fomit-frame-pointer -std=gnu11 \ 446 -Wdeclaration-after-statement 447KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 448KBUILD_USERLDFLAGS := $(USERLDFLAGS) 449 450KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 451KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 452KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 453KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 454 455# Make variables (CC, etc...) 456CPP = $(CC) -E 457ifneq ($(LLVM),) 458CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 459LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 460AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 461NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 462OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 463OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 464READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 465STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 466else 467CC = $(CROSS_COMPILE)gcc 468LD = $(CROSS_COMPILE)ld 469AR = $(CROSS_COMPILE)ar 470NM = $(CROSS_COMPILE)nm 471OBJCOPY = $(CROSS_COMPILE)objcopy 472OBJDUMP = $(CROSS_COMPILE)objdump 473READELF = $(CROSS_COMPILE)readelf 474STRIP = $(CROSS_COMPILE)strip 475endif 476PAHOLE = pahole 477RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 478LEX = flex 479YACC = bison 480AWK = awk 481INSTALLKERNEL := installkernel 482DEPMOD = depmod 483PERL = perl 484PYTHON3 = python3 485CHECK = sparse 486BASH = bash 487KGZIP = gzip 488KBZIP2 = bzip2 489KLZOP = lzop 490LZMA = lzma 491LZ4 = lz4c 492XZ = xz 493ZSTD = zstd 494 495PAHOLE_FLAGS = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh) 496 497CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 498 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 499NOSTDINC_FLAGS := 500CFLAGS_MODULE = 501AFLAGS_MODULE = 502LDFLAGS_MODULE = 503CFLAGS_KERNEL = 504AFLAGS_KERNEL = 505LDFLAGS_vmlinux = 506 507# Use USERINCLUDE when you must reference the UAPI directories only. 508USERINCLUDE := \ 509 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 510 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 511 -I$(srctree)/include/uapi \ 512 -I$(objtree)/include/generated/uapi \ 513 -include $(srctree)/include/linux/compiler-version.h \ 514 -include $(srctree)/include/linux/kconfig.h 515 516# Use LINUXINCLUDE when you must reference the include/ directory. 517# Needed to be compatible with the O= option 518LINUXINCLUDE := \ 519 -I$(srctree)/arch/$(SRCARCH)/include \ 520 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 521 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 522 -I$(objtree)/include \ 523 $(USERINCLUDE) 524 525KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 526KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 527 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 528 -Werror=implicit-function-declaration -Werror=implicit-int \ 529 -Werror=return-type -Wno-format-security \ 530 -std=gnu11 531KBUILD_CPPFLAGS := -D__KERNEL__ 532KBUILD_AFLAGS_KERNEL := 533KBUILD_CFLAGS_KERNEL := 534KBUILD_AFLAGS_MODULE := -DMODULE 535KBUILD_CFLAGS_MODULE := -DMODULE 536KBUILD_LDFLAGS_MODULE := 537KBUILD_LDFLAGS := 538CLANG_FLAGS := 539 540export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 541export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 542export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 543export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 544export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 545export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 546 547export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 548export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 549export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 550export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 551export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 552export PAHOLE_FLAGS 553 554# Files to ignore in find ... statements 555 556export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 557 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 558 -prune -o 559export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 560 --exclude CVS --exclude .pc --exclude .hg --exclude .git 561 562# =========================================================================== 563# Rules shared between *config targets and build targets 564 565# Basic helpers built in scripts/basic/ 566PHONY += scripts_basic 567scripts_basic: 568 $(Q)$(MAKE) $(build)=scripts/basic 569 570PHONY += outputmakefile 571ifdef building_out_of_srctree 572# Before starting out-of-tree build, make sure the source tree is clean. 573# outputmakefile generates a Makefile in the output directory, if using a 574# separate output directory. This allows convenient use of make in the 575# output directory. 576# At the same time when output Makefile generated, generate .gitignore to 577# ignore whole output directory 578 579quiet_cmd_makefile = GEN Makefile 580 cmd_makefile = { \ 581 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 582 echo "include $(srctree)/Makefile"; \ 583 } > Makefile 584 585outputmakefile: 586 @if [ -f $(srctree)/.config -o \ 587 -d $(srctree)/include/config -o \ 588 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 589 echo >&2 "***"; \ 590 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 591 echo >&2 "*** in $(abs_srctree)";\ 592 echo >&2 "***"; \ 593 false; \ 594 fi 595 $(Q)ln -fsn $(srctree) source 596 $(call cmd,makefile) 597 $(Q)test -e .gitignore || \ 598 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 599endif 600 601# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 602# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 603# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 604# and from include/config/auto.conf.cmd to detect the compiler upgrade. 605CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 606 607ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 608include $(srctree)/scripts/Makefile.clang 609endif 610 611# Include this also for config targets because some architectures need 612# cc-cross-prefix to determine CROSS_COMPILE. 613ifdef need-compiler 614include $(srctree)/scripts/Makefile.compiler 615endif 616 617ifdef config-build 618# =========================================================================== 619# *config targets only - make sure prerequisites are updated, and descend 620# in scripts/kconfig to make the *config target 621 622# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 623# KBUILD_DEFCONFIG may point out an alternative default configuration 624# used for 'make defconfig' 625include $(srctree)/arch/$(SRCARCH)/Makefile 626export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 627 628config: outputmakefile scripts_basic FORCE 629 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 630 631%config: outputmakefile scripts_basic FORCE 632 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 633 634else #!config-build 635# =========================================================================== 636# Build targets only - this includes vmlinux, arch specific targets, clean 637# targets and others. In general all targets except *config targets. 638 639# If building an external module we do not care about the all: rule 640# but instead __all depend on modules 641PHONY += all 642ifeq ($(KBUILD_EXTMOD),) 643__all: all 644else 645__all: modules 646endif 647 648targets := 649 650# Decide whether to build built-in, modular, or both. 651# Normally, just do built-in. 652 653KBUILD_MODULES := 654KBUILD_BUILTIN := 1 655 656# If we have only "make modules", don't compile built-in objects. 657ifeq ($(MAKECMDGOALS),modules) 658 KBUILD_BUILTIN := 659endif 660 661# If we have "make <whatever> modules", compile modules 662# in addition to whatever we do anyway. 663# Just "make" or "make all" shall build modules as well 664 665ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 666 KBUILD_MODULES := 1 667endif 668 669ifeq ($(MAKECMDGOALS),) 670 KBUILD_MODULES := 1 671endif 672 673export KBUILD_MODULES KBUILD_BUILTIN 674 675ifdef need-config 676include include/config/auto.conf 677endif 678 679ifeq ($(KBUILD_EXTMOD),) 680# Objects we will link into vmlinux / subdirs we need to visit 681core-y := 682drivers-y := 683libs-y := lib/ 684endif # KBUILD_EXTMOD 685 686# The all: target is the default when no target is given on the 687# command line. 688# This allow a user to issue only 'make' to build a kernel including modules 689# Defaults to vmlinux, but the arch makefile usually adds further targets 690all: vmlinux 691 692CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 693ifdef CONFIG_CC_IS_GCC 694CFLAGS_GCOV += -fno-tree-loop-im 695endif 696export CFLAGS_GCOV 697 698# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 699ifdef CONFIG_FUNCTION_TRACER 700 CC_FLAGS_FTRACE := -pg 701endif 702 703include $(srctree)/arch/$(SRCARCH)/Makefile 704 705ifdef need-config 706ifdef may-sync-config 707# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 708# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 709# because some architectures define CROSS_COMPILE there. 710include include/config/auto.conf.cmd 711 712$(KCONFIG_CONFIG): 713 @echo >&2 '***' 714 @echo >&2 '*** Configuration file "$@" not found!' 715 @echo >&2 '***' 716 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 717 @echo >&2 '*** "make menuconfig" or "make xconfig").' 718 @echo >&2 '***' 719 @/bin/false 720 721# The actual configuration files used during the build are stored in 722# include/generated/ and include/config/. Update them if .config is newer than 723# include/config/auto.conf (which mirrors .config). 724# 725# This exploits the 'multi-target pattern rule' trick. 726# The syncconfig should be executed only once to make all the targets. 727# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 728# 729# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 730# so you cannot notice that Kconfig is waiting for the user input. 731%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 732 $(Q)$(kecho) " SYNC $@" 733 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 734else # !may-sync-config 735# External modules and some install targets need include/generated/autoconf.h 736# and include/config/auto.conf but do not care if they are up-to-date. 737# Use auto.conf to trigger the test 738PHONY += include/config/auto.conf 739 740include/config/auto.conf: 741 @test -e include/generated/autoconf.h -a -e $@ || ( \ 742 echo >&2; \ 743 echo >&2 " ERROR: Kernel configuration is invalid."; \ 744 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 745 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 746 echo >&2 ; \ 747 /bin/false) 748 749endif # may-sync-config 750endif # need-config 751 752KBUILD_CFLAGS += -fno-delete-null-pointer-checks 753KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 754KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 755KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 756KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 757 758ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 759KBUILD_CFLAGS += -O2 760else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 761KBUILD_CFLAGS += -Os 762endif 763 764# Tell gcc to never replace conditional load with a non-conditional one 765ifdef CONFIG_CC_IS_GCC 766# gcc-10 renamed --param=allow-store-data-races=0 to 767# -fno-allow-store-data-races. 768KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 769KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 770endif 771 772ifdef CONFIG_READABLE_ASM 773# Disable optimizations that make assembler listings hard to read. 774# reorder blocks reorders the control in the function 775# ipa clone creates specialized cloned functions 776# partial inlining inlines only parts of functions 777KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining 778endif 779 780ifneq ($(CONFIG_FRAME_WARN),0) 781KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 782endif 783 784stackp-flags-y := -fno-stack-protector 785stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 786stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 787 788KBUILD_CFLAGS += $(stackp-flags-y) 789 790KBUILD_CFLAGS-$(CONFIG_WERROR) += -Werror 791KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUNDS) += -Wno-array-bounds 792 793ifdef CONFIG_CC_IS_CLANG 794KBUILD_CPPFLAGS += -Qunused-arguments 795# The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable. 796KBUILD_CFLAGS += -Wno-gnu 797else 798 799# gcc inanely warns about local variables called 'main' 800KBUILD_CFLAGS += -Wno-main 801endif 802 803# These warnings generated too much noise in a regular build. 804# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 805KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 806KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 807 808# These result in bogus false positives 809KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer) 810 811ifdef CONFIG_FRAME_POINTER 812KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 813else 814# Some targets (ARM with Thumb2, for example), can't be built with frame 815# pointers. For those, we don't have FUNCTION_TRACER automatically 816# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 817# incompatible with -fomit-frame-pointer with current GCC, so we don't use 818# -fomit-frame-pointer with FUNCTION_TRACER. 819ifndef CONFIG_FUNCTION_TRACER 820KBUILD_CFLAGS += -fomit-frame-pointer 821endif 822endif 823 824# Initialize all stack variables with a 0xAA pattern. 825ifdef CONFIG_INIT_STACK_ALL_PATTERN 826KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 827endif 828 829# Initialize all stack variables with a zero value. 830ifdef CONFIG_INIT_STACK_ALL_ZERO 831KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 832ifdef CONFIG_CC_IS_CLANG 833# https://bugs.llvm.org/show_bug.cgi?id=45497 834KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 835endif 836endif 837 838# While VLAs have been removed, GCC produces unreachable stack probes 839# for the randomize_kstack_offset feature. Disable it for all compilers. 840KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 841 842# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 843ifdef CONFIG_ZERO_CALL_USED_REGS 844KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 845endif 846 847ifdef CONFIG_FUNCTION_TRACER 848ifdef CONFIG_FTRACE_MCOUNT_USE_CC 849 CC_FLAGS_FTRACE += -mrecord-mcount 850 ifdef CONFIG_HAVE_NOP_MCOUNT 851 ifeq ($(call cc-option-yn, -mnop-mcount),y) 852 CC_FLAGS_FTRACE += -mnop-mcount 853 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 854 endif 855 endif 856endif 857ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 858 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 859endif 860ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 861 ifdef CONFIG_HAVE_C_RECORDMCOUNT 862 BUILD_C_RECORDMCOUNT := y 863 export BUILD_C_RECORDMCOUNT 864 endif 865endif 866ifdef CONFIG_HAVE_FENTRY 867 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 868 ifeq ($(call cc-option-yn, -mfentry),y) 869 CC_FLAGS_FTRACE += -mfentry 870 CC_FLAGS_USING += -DCC_USING_FENTRY 871 endif 872endif 873export CC_FLAGS_FTRACE 874KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 875KBUILD_AFLAGS += $(CC_FLAGS_USING) 876endif 877 878# We trigger additional mismatches with less inlining 879ifdef CONFIG_DEBUG_SECTION_MISMATCH 880KBUILD_CFLAGS += -fno-inline-functions-called-once 881endif 882 883ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 884KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 885LDFLAGS_vmlinux += --gc-sections 886endif 887 888ifdef CONFIG_SHADOW_CALL_STACK 889CC_FLAGS_SCS := -fsanitize=shadow-call-stack 890KBUILD_CFLAGS += $(CC_FLAGS_SCS) 891export CC_FLAGS_SCS 892endif 893 894ifdef CONFIG_LTO_CLANG 895ifdef CONFIG_LTO_CLANG_THIN 896CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 897KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache 898else 899CC_FLAGS_LTO := -flto 900endif 901CC_FLAGS_LTO += -fvisibility=hidden 902 903# Limit inlining across translation units to reduce binary size 904KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 905 906# Check for frame size exceeding threshold during prolog/epilog insertion 907# when using lld < 13.0.0. 908ifneq ($(CONFIG_FRAME_WARN),0) 909ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0) 910KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) 911endif 912endif 913endif 914 915ifdef CONFIG_LTO 916KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 917KBUILD_AFLAGS += -fno-lto 918export CC_FLAGS_LTO 919endif 920 921ifdef CONFIG_CFI_CLANG 922CC_FLAGS_CFI := -fsanitize=cfi \ 923 -fsanitize-cfi-cross-dso \ 924 -fno-sanitize-cfi-canonical-jump-tables \ 925 -fno-sanitize-trap=cfi \ 926 -fno-sanitize-blacklist 927 928ifdef CONFIG_CFI_PERMISSIVE 929CC_FLAGS_CFI += -fsanitize-recover=cfi 930endif 931 932# If LTO flags are filtered out, we must also filter out CFI. 933CC_FLAGS_LTO += $(CC_FLAGS_CFI) 934KBUILD_CFLAGS += $(CC_FLAGS_CFI) 935export CC_FLAGS_CFI 936endif 937 938ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B 939KBUILD_CFLAGS += -falign-functions=64 940endif 941 942# arch Makefile may override CC so keep this after arch Makefile is included 943NOSTDINC_FLAGS += -nostdinc 944 945# warn about C99 declaration after statement 946KBUILD_CFLAGS += -Wdeclaration-after-statement 947 948# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 949KBUILD_CFLAGS += -Wvla 950 951# disable pointer signed / unsigned warnings in gcc 4.0 952KBUILD_CFLAGS += -Wno-pointer-sign 953 954# In order to make sure new function cast mismatches are not introduced 955# in the kernel (to avoid tripping CFI checking), the kernel should be 956# globally built with -Wcast-function-type. 957KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type) 958 959# disable stringop warnings in gcc 8+ 960KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 961 962# We'll want to enable this eventually, but it's not going away for 5.7 at least 963KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 964 965# Another good warning that we'll want to enable eventually 966KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 967 968# Enabled with W=2, disabled by default as noisy 969ifdef CONFIG_CC_IS_GCC 970KBUILD_CFLAGS += -Wno-maybe-uninitialized 971endif 972 973# The allocators already balk at large sizes, so silence the compiler 974# warnings for bounds checks involving those possible values. While 975# -Wno-alloc-size-larger-than would normally be used here, earlier versions 976# of gcc (<9.1) weirdly don't handle the option correctly when _other_ 977# warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX 978# doesn't work (as it is documented to), silently resolving to "0" prior to 979# version 9.1 (and producing an error more recently). Numeric values larger 980# than PTRDIFF_MAX also don't work prior to version 9.1, which are silently 981# ignored, continuing to default to PTRDIFF_MAX. So, left with no other 982# choice, we must perform a versioned check to disable this warning. 983# https://lore.kernel.org/lkml/[email protected] 984KBUILD_CFLAGS-$(call gcc-min-version, 90100) += -Wno-alloc-size-larger-than 985KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH) 986 987# disable invalid "can't wrap" optimizations for signed / pointers 988KBUILD_CFLAGS += -fno-strict-overflow 989 990# Make sure -fstack-check isn't enabled (like gentoo apparently did) 991KBUILD_CFLAGS += -fno-stack-check 992 993# conserve stack if available 994ifdef CONFIG_CC_IS_GCC 995KBUILD_CFLAGS += -fconserve-stack 996endif 997 998# Prohibit date/time macros, which would make the build non-deterministic 999KBUILD_CFLAGS += -Werror=date-time 1000 1001# enforce correct pointer usage 1002KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 1003 1004# Require designated initializers for all marked structures 1005KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 1006 1007# change __FILE__ to the relative path from the srctree 1008KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1009 1010# include additional Makefiles when needed 1011include-y := scripts/Makefile.extrawarn 1012include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1013include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1014include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1015include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1016include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1017include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1018include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1019 1020include $(addprefix $(srctree)/, $(include-y)) 1021 1022# scripts/Makefile.gcc-plugins is intentionally included last. 1023# Do not add $(call cc-option,...) below this line. When you build the kernel 1024# from the clean source tree, the GCC plugins do not exist at this point. 1025 1026# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 1027KBUILD_CPPFLAGS += $(KCPPFLAGS) 1028KBUILD_AFLAGS += $(KAFLAGS) 1029KBUILD_CFLAGS += $(KCFLAGS) 1030 1031KBUILD_LDFLAGS_MODULE += --build-id=sha1 1032LDFLAGS_vmlinux += --build-id=sha1 1033 1034KBUILD_LDFLAGS += -z noexecstack 1035ifeq ($(CONFIG_LD_IS_BFD),y) 1036KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) 1037endif 1038 1039ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1040LDFLAGS_vmlinux += $(call ld-option, -X,) 1041endif 1042 1043ifeq ($(CONFIG_RELR),y) 1044LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags 1045endif 1046 1047# We never want expected sections to be placed heuristically by the 1048# linker. All sections should be explicitly named in the linker script. 1049ifdef CONFIG_LD_ORPHAN_WARN 1050LDFLAGS_vmlinux += --orphan-handling=warn 1051endif 1052 1053# Align the bit size of userspace programs with the kernel 1054KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1055KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1056 1057# make the checker run with the right architecture 1058CHECKFLAGS += --arch=$(ARCH) 1059 1060# insure the checker run with the right endianness 1061CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1062 1063# the checker needs the correct machine size 1064CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1065 1066# Default kernel image to build when no specific target is given. 1067# KBUILD_IMAGE may be overruled on the command line or 1068# set in the environment 1069# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1070# this default value 1071export KBUILD_IMAGE ?= vmlinux 1072 1073# 1074# INSTALL_PATH specifies where to place the updated kernel and system map 1075# images. Default is /boot, but you can set it to other values 1076export INSTALL_PATH ?= /boot 1077 1078# 1079# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1080# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1081# an argument if needed. Otherwise it defaults to the kernel install path 1082# 1083export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1084 1085# 1086# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1087# relocations required by build roots. This is not defined in the 1088# makefile but the argument can be passed to make if needed. 1089# 1090 1091MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1092export MODLIB 1093 1094PHONY += prepare0 1095 1096export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1097export MODORDER := $(extmod_prefix)modules.order 1098export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1099 1100ifeq ($(KBUILD_EXTMOD),) 1101 1102build-dir := . 1103clean-dirs := $(sort . Documentation \ 1104 $(patsubst %/,%,$(filter %/, $(core-) \ 1105 $(drivers-) $(libs-)))) 1106 1107export ARCH_CORE := $(core-y) 1108export ARCH_LIB := $(filter %/, $(libs-y)) 1109export ARCH_DRIVERS := $(drivers-y) $(drivers-m) 1110# Externally visible symbols (used by link-vmlinux.sh) 1111 1112KBUILD_VMLINUX_OBJS := ./built-in.a 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 1119 1120export KBUILD_VMLINUX_LIBS 1121export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1122 1123# Recurse until adjust_autoksyms.sh is satisfied 1124PHONY += autoksyms_recursive 1125ifdef CONFIG_TRIM_UNUSED_KSYMS 1126# For the kernel to actually contain only the needed exported symbols, 1127# we have to build modules as well to determine what those symbols are. 1128# (this can be evaluated only once include/config/auto.conf has been included) 1129KBUILD_MODULES := 1 1130 1131autoksyms_recursive: $(build-dir) modules.order 1132 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1133 "$(MAKE) -f $(srctree)/Makefile autoksyms_recursive" 1134endif 1135 1136autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1137 1138quiet_cmd_autoksyms_h = GEN $@ 1139 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1140 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1141 1142$(autoksyms_h): 1143 $(call cmd,autoksyms_h) 1144 1145# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 1146quiet_cmd_ar_vmlinux.a = AR $@ 1147 cmd_ar_vmlinux.a = \ 1148 rm -f $@; \ 1149 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ 1150 $(AR) mPiT $$($(AR) t $@ | head -n1) $@ $$($(AR) t $@ | grep -F --file=$(srctree)/scripts/head-object-list.txt) 1151 1152targets += vmlinux.a 1153vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt autoksyms_recursive FORCE 1154 $(call if_changed,ar_vmlinux.a) 1155 1156vmlinux.o: vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE 1157 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o 1158 1159ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1160 1161# Final link of vmlinux with optional arch pass after final link 1162cmd_link-vmlinux = \ 1163 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \ 1164 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1165 1166vmlinux: scripts/link-vmlinux.sh vmlinux.o $(KBUILD_LDS) modpost FORCE 1167 +$(call if_changed_dep,link-vmlinux) 1168 1169targets += vmlinux 1170 1171# The actual objects are generated when descending, 1172# make sure no implicit rule kicks in 1173$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; 1174 1175filechk_kernel.release = \ 1176 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1177 1178# Store (new) KERNELRELEASE string in include/config/kernel.release 1179include/config/kernel.release: FORCE 1180 $(call filechk,kernel.release) 1181 1182# Additional helpers built in scripts/ 1183# Carefully list dependencies so we do not try to build scripts twice 1184# in parallel 1185PHONY += scripts 1186scripts: scripts_basic scripts_dtc 1187 $(Q)$(MAKE) $(build)=$(@) 1188 1189# Things we need to do before we recursively start building the kernel 1190# or the modules are listed in "prepare". 1191# A multi level approach is used. prepareN is processed before prepareN-1. 1192# archprepare is used in arch Makefiles and when processed asm symlink, 1193# version.h and scripts_basic is processed / created. 1194 1195PHONY += prepare archprepare 1196 1197archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1198 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1199 include/generated/compile.h include/generated/autoconf.h remove-stale-files 1200 1201prepare0: archprepare 1202 $(Q)$(MAKE) $(build)=scripts/mod 1203 $(Q)$(MAKE) $(build)=. prepare 1204 1205# All the preparing.. 1206prepare: prepare0 1207 1208PHONY += remove-stale-files 1209remove-stale-files: 1210 $(Q)$(srctree)/scripts/remove-stale-files 1211 1212# Support for using generic headers in asm-generic 1213asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1214 1215PHONY += asm-generic uapi-asm-generic 1216asm-generic: uapi-asm-generic 1217 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1218 generic=include/asm-generic 1219uapi-asm-generic: 1220 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1221 generic=include/uapi/asm-generic 1222 1223# Generate some files 1224# --------------------------------------------------------------------------- 1225 1226# KERNELRELEASE can change from a few different places, meaning version.h 1227# needs to be updated, so this check is forced on all builds 1228 1229uts_len := 64 1230define filechk_utsrelease.h 1231 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1232 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1233 exit 1; \ 1234 fi; \ 1235 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1236endef 1237 1238define filechk_version.h 1239 if [ $(SUBLEVEL) -gt 255 ]; then \ 1240 echo \#define LINUX_VERSION_CODE $(shell \ 1241 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1242 else \ 1243 echo \#define LINUX_VERSION_CODE $(shell \ 1244 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1245 fi; \ 1246 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1247 ((c) > 255 ? 255 : (c)))'; \ 1248 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1249 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1250 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1251endef 1252 1253$(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1254$(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0) 1255$(version_h): FORCE 1256 $(call filechk,version.h) 1257 1258include/generated/utsrelease.h: include/config/kernel.release FORCE 1259 $(call filechk,utsrelease.h) 1260 1261filechk_compile.h = $(srctree)/scripts/mkcompile_h \ 1262 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" 1263 1264include/generated/compile.h: FORCE 1265 $(call filechk,compile.h) 1266 1267PHONY += headerdep 1268headerdep: 1269 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1270 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1271 1272# --------------------------------------------------------------------------- 1273# Kernel headers 1274 1275#Default location for installed headers 1276export INSTALL_HDR_PATH = $(objtree)/usr 1277 1278quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1279 cmd_headers_install = \ 1280 mkdir -p $(INSTALL_HDR_PATH); \ 1281 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1282 usr/include $(INSTALL_HDR_PATH) 1283 1284PHONY += headers_install 1285headers_install: headers 1286 $(call cmd,headers_install) 1287 1288PHONY += archheaders archscripts 1289 1290hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1291 1292PHONY += headers 1293headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1294 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML)) 1295 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1296 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1297 1298ifdef CONFIG_HEADERS_INSTALL 1299prepare: headers 1300endif 1301 1302PHONY += scripts_unifdef 1303scripts_unifdef: scripts_basic 1304 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1305 1306# --------------------------------------------------------------------------- 1307# Install 1308 1309# Many distributions have the custom install script, /sbin/installkernel. 1310# If DKMS is installed, 'make install' will eventually recurse back 1311# to this Makefile to build and install external modules. 1312# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1313 1314quiet_cmd_install = INSTALL $(INSTALL_PATH) 1315 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1316 1317# --------------------------------------------------------------------------- 1318# Tools 1319 1320ifdef CONFIG_OBJTOOL 1321prepare: tools/objtool 1322endif 1323 1324ifdef CONFIG_BPF 1325ifdef CONFIG_DEBUG_INFO_BTF 1326prepare: tools/bpf/resolve_btfids 1327endif 1328endif 1329 1330PHONY += resolve_btfids_clean 1331 1332resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1333 1334# tools/bpf/resolve_btfids directory might not exist 1335# in output directory, skip its clean in that case 1336resolve_btfids_clean: 1337ifneq ($(wildcard $(resolve_btfids_O)),) 1338 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1339endif 1340 1341# Clear a bunch of variables before executing the submake 1342ifeq ($(quiet),silent_) 1343tools_silent=s 1344endif 1345 1346tools/: FORCE 1347 $(Q)mkdir -p $(objtree)/tools 1348 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1349 1350tools/%: FORCE 1351 $(Q)mkdir -p $(objtree)/tools 1352 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1353 1354# --------------------------------------------------------------------------- 1355# Kernel selftest 1356 1357PHONY += kselftest 1358kselftest: headers 1359 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1360 1361kselftest-%: headers FORCE 1362 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1363 1364PHONY += kselftest-merge 1365kselftest-merge: 1366 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1367 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1368 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1369 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1370 1371# --------------------------------------------------------------------------- 1372# Devicetree files 1373 1374ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1375dtstree := arch/$(SRCARCH)/boot/dts 1376endif 1377 1378ifneq ($(dtstree),) 1379 1380%.dtb: dtbs_prepare 1381 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1382 1383%.dtbo: dtbs_prepare 1384 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1385 1386PHONY += dtbs dtbs_prepare dtbs_install dtbs_check 1387dtbs: dtbs_prepare 1388 $(Q)$(MAKE) $(build)=$(dtstree) 1389 1390# include/config/kernel.release is actually needed when installing DTBs because 1391# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make 1392# dtbs_install depend on it as dtbs_install may run as root. 1393dtbs_prepare: include/config/kernel.release scripts_dtc 1394 1395ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1396export CHECK_DTBS=y 1397dtbs: dt_binding_check 1398endif 1399 1400dtbs_check: dtbs 1401 1402dtbs_install: 1403 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1404 1405ifdef CONFIG_OF_EARLY_FLATTREE 1406all: dtbs 1407endif 1408 1409endif 1410 1411PHONY += scripts_dtc 1412scripts_dtc: scripts_basic 1413 $(Q)$(MAKE) $(build)=scripts/dtc 1414 1415ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1416export CHECK_DT_BINDING=y 1417endif 1418 1419PHONY += dt_binding_check 1420dt_binding_check: scripts_dtc 1421 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1422 1423# --------------------------------------------------------------------------- 1424# Modules 1425 1426ifdef CONFIG_MODULES 1427 1428# By default, build modules as well 1429 1430all: modules 1431 1432# When we're building modules with modversions, we need to consider 1433# the built-in objects during the descend as well, in order to 1434# make sure the checksums are up to date before we record them. 1435ifdef CONFIG_MODVERSIONS 1436 KBUILD_BUILTIN := 1 1437endif 1438 1439# Build modules 1440# 1441 1442# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFOBTF_MODULES 1443# is an exception. 1444ifdef CONFIG_DEBUG_INFO_BTF_MODULES 1445modules: vmlinux 1446endif 1447 1448modules: modules_prepare 1449 1450# Target to prepare building external modules 1451modules_prepare: prepare 1452 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1453 1454export modules_sign_only := 1455 1456ifeq ($(CONFIG_MODULE_SIG),y) 1457PHONY += modules_sign 1458modules_sign: modules_install 1459 @: 1460 1461# modules_sign is a subset of modules_install. 1462# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1463ifeq ($(filter modules_install,$(MAKECMDGOALS)),) 1464modules_sign_only := y 1465endif 1466endif 1467 1468modinst_pre := 1469ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 1470modinst_pre := __modinst_pre 1471endif 1472 1473modules_install: $(modinst_pre) 1474PHONY += __modinst_pre 1475__modinst_pre: 1476 @rm -rf $(MODLIB)/kernel 1477 @rm -f $(MODLIB)/source 1478 @mkdir -p $(MODLIB)/kernel 1479 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1480 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1481 rm -f $(MODLIB)/build ; \ 1482 ln -s $(CURDIR) $(MODLIB)/build ; \ 1483 fi 1484 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1485 @cp -f modules.builtin $(MODLIB)/ 1486 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1487 1488endif # CONFIG_MODULES 1489 1490### 1491# Cleaning is done on three levels. 1492# make clean Delete most generated files 1493# Leave enough to build external modules 1494# make mrproper Delete the current configuration, and all generated files 1495# make distclean Remove editor backup files, patch leftover files and the like 1496 1497# Directories & files removed with 'make clean' 1498CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ 1499 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1500 compile_commands.json .thinlto-cache .vmlinux.objs 1501 1502# Directories & files removed with 'make mrproper' 1503MRPROPER_FILES += include/config include/generated \ 1504 arch/$(SRCARCH)/include/generated .objdiff \ 1505 debian snap tar-install \ 1506 .config .config.old .version \ 1507 Module.symvers \ 1508 certs/signing_key.pem \ 1509 certs/x509.genkey \ 1510 vmlinux-gdb.py \ 1511 *.spec 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# 1539PHONY += distclean 1540 1541distclean: mrproper 1542 @find . $(RCS_FIND_IGNORE) \ 1543 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1544 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1545 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1546 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1547 -type f -print | xargs rm -f 1548 1549 1550# Packaging of the kernel to various formats 1551# --------------------------------------------------------------------------- 1552 1553%src-pkg: FORCE 1554 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1555%pkg: include/config/kernel.release FORCE 1556 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1557 1558# Brief documentation of the typical targets used 1559# --------------------------------------------------------------------------- 1560 1561boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1562boards := $(sort $(notdir $(boards))) 1563board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1564board-dirs := $(sort $(notdir $(board-dirs:/=))) 1565 1566PHONY += help 1567help: 1568 @echo 'Cleaning targets:' 1569 @echo ' clean - Remove most generated files but keep the config and' 1570 @echo ' enough build support to build external modules' 1571 @echo ' mrproper - Remove all generated files + config + various backup files' 1572 @echo ' distclean - mrproper + remove editor backup and patch files' 1573 @echo '' 1574 @echo 'Configuration targets:' 1575 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1576 @echo '' 1577 @echo 'Other generic targets:' 1578 @echo ' all - Build all targets marked with [*]' 1579 @echo '* vmlinux - Build the bare kernel' 1580 @echo '* modules - Build all modules' 1581 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1582 @echo ' dir/ - Build all files in dir and below' 1583 @echo ' dir/file.[ois] - Build specified target only' 1584 @echo ' dir/file.ll - Build the LLVM assembly file' 1585 @echo ' (requires compiler support for LLVM assembly generation)' 1586 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1587 @echo ' (requires a recent binutils and recent build (System.map))' 1588 @echo ' dir/file.ko - Build module including final link' 1589 @echo ' modules_prepare - Set up for building external modules' 1590 @echo ' tags/TAGS - Generate tags file for editors' 1591 @echo ' cscope - Generate cscope index' 1592 @echo ' gtags - Generate GNU GLOBAL index' 1593 @echo ' kernelrelease - Output the release version string (use with make -s)' 1594 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1595 @echo ' image_name - Output the image name (use with make -s)' 1596 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1597 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1598 echo '' 1599 @echo 'Static analysers:' 1600 @echo ' checkstack - Generate a list of stack hogs' 1601 @echo ' versioncheck - Sanity check on version.h usage' 1602 @echo ' includecheck - Check for duplicate included header files' 1603 @echo ' export_report - List the usages of all exported symbols' 1604 @echo ' headerdep - Detect inclusion cycles in headers' 1605 @echo ' coccicheck - Check with Coccinelle' 1606 @echo ' clang-analyzer - Check with clang static analyzer' 1607 @echo ' clang-tidy - Check with clang-tidy' 1608 @echo '' 1609 @echo 'Tools:' 1610 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1611 @echo '' 1612 @echo 'Kernel selftest:' 1613 @echo ' kselftest - Build and run kernel selftest' 1614 @echo ' Build, install, and boot kernel before' 1615 @echo ' running kselftest on it' 1616 @echo ' Run as root for full coverage' 1617 @echo ' kselftest-all - Build kernel selftest' 1618 @echo ' kselftest-install - Build and install kernel selftest' 1619 @echo ' kselftest-clean - Remove all generated kselftest files' 1620 @echo ' kselftest-merge - Merge all the config dependencies of' 1621 @echo ' kselftest to existing .config.' 1622 @echo '' 1623 @$(if $(dtstree), \ 1624 echo 'Devicetree:'; \ 1625 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1626 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1627 echo ' dt_binding_check - Validate device tree binding documents'; \ 1628 echo ' dtbs_check - Validate device tree source files';\ 1629 echo '') 1630 1631 @echo 'Userspace tools targets:' 1632 @echo ' use "make tools/help"' 1633 @echo ' or "cd tools; make help"' 1634 @echo '' 1635 @echo 'Kernel packaging:' 1636 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1637 @echo '' 1638 @echo 'Documentation targets:' 1639 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1640 @echo '' 1641 @echo 'Architecture specific targets ($(SRCARCH)):' 1642 @$(or $(archhelp),\ 1643 echo ' No architecture specific help defined for $(SRCARCH)') 1644 @echo '' 1645 @$(if $(boards), \ 1646 $(foreach b, $(boards), \ 1647 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1648 echo '') 1649 @$(if $(board-dirs), \ 1650 $(foreach b, $(board-dirs), \ 1651 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1652 printf " %-16s - Show all of the above\\n" help-boards; \ 1653 echo '') 1654 1655 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1656 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1657 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1658 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1659 @echo ' (sparse by default)' 1660 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1661 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1662 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1663 @echo ' 1: warnings which may be relevant and do not occur too often' 1664 @echo ' 2: warnings which occur quite often but may still be relevant' 1665 @echo ' 3: more obscure warnings, can most likely be ignored' 1666 @echo ' e: warnings are being treated as errors' 1667 @echo ' Multiple levels can be combined with W=12 or W=123' 1668 @echo '' 1669 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1670 @echo 'For further info see the ./README file' 1671 1672 1673help-board-dirs := $(addprefix help-,$(board-dirs)) 1674 1675help-boards: $(help-board-dirs) 1676 1677boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1678 1679$(help-board-dirs): help-%: 1680 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1681 @$(if $(boards-per-dir), \ 1682 $(foreach b, $(boards-per-dir), \ 1683 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1684 echo '') 1685 1686 1687# Documentation targets 1688# --------------------------------------------------------------------------- 1689DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1690 linkcheckdocs dochelp refcheckdocs 1691PHONY += $(DOC_TARGETS) 1692$(DOC_TARGETS): 1693 $(Q)$(MAKE) $(build)=Documentation $@ 1694 1695# Misc 1696# --------------------------------------------------------------------------- 1697 1698PHONY += scripts_gdb 1699scripts_gdb: prepare0 1700 $(Q)$(MAKE) $(build)=scripts/gdb 1701 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1702 1703ifdef CONFIG_GDB_SCRIPTS 1704all: scripts_gdb 1705endif 1706 1707else # KBUILD_EXTMOD 1708 1709### 1710# External module support. 1711# When building external modules the kernel used as basis is considered 1712# read-only, and no consistency checks are made and the make 1713# system is not used on the basis kernel. If updates are required 1714# in the basis kernel ordinary make commands (without M=...) must be used. 1715 1716# We are always building only modules. 1717KBUILD_BUILTIN := 1718KBUILD_MODULES := 1 1719 1720build-dir := $(KBUILD_EXTMOD) 1721 1722compile_commands.json: $(extmod_prefix)compile_commands.json 1723PHONY += compile_commands.json 1724 1725clean-dirs := $(KBUILD_EXTMOD) 1726clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1727 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1728 1729PHONY += prepare 1730# now expand this into a simple variable to reduce the cost of shell evaluations 1731prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1732prepare: 1733 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1734 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1735 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1736 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1737 fi 1738 1739PHONY += help 1740help: 1741 @echo ' Building external modules.' 1742 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1743 @echo '' 1744 @echo ' modules - default target, build the module(s)' 1745 @echo ' modules_install - install the module' 1746 @echo ' clean - remove generated files in module directory only' 1747 @echo '' 1748 1749endif # KBUILD_EXTMOD 1750 1751# --------------------------------------------------------------------------- 1752# Modules 1753 1754PHONY += modules modules_install modules_prepare 1755 1756ifdef CONFIG_MODULES 1757 1758$(MODORDER): $(build-dir) 1759 @: 1760 1761# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. 1762# This is solely useful to speed up test compiles. 1763modules: modpost 1764ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1765 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1766endif 1767 1768PHONY += modules_check 1769modules_check: $(MODORDER) 1770 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1771 1772quiet_cmd_depmod = DEPMOD $(MODLIB) 1773 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1774 $(KERNELRELEASE) 1775 1776modules_install: 1777 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1778 $(call cmd,depmod) 1779 1780else # CONFIG_MODULES 1781 1782# Modules not configured 1783# --------------------------------------------------------------------------- 1784 1785modules modules_install: 1786 @echo >&2 '***' 1787 @echo >&2 '*** The present kernel configuration has modules disabled.' 1788 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.' 1789 @echo >&2 '*** to enable CONFIG_MODULES.' 1790 @echo >&2 '***' 1791 @exit 1 1792 1793KBUILD_MODULES := 1794 1795endif # CONFIG_MODULES 1796 1797PHONY += modpost 1798modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ 1799 $(if $(KBUILD_MODULES), modules_check) 1800 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1801 1802# Single targets 1803# --------------------------------------------------------------------------- 1804# To build individual files in subdirectories, you can do like this: 1805# 1806# make foo/bar/baz.s 1807# 1808# The supported suffixes for single-target are listed in 'single-targets' 1809# 1810# To build only under specific subdirectories, you can do like this: 1811# 1812# make foo/bar/baz/ 1813 1814ifdef single-build 1815 1816# .ko is special because modpost is needed 1817single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1818single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 1819 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 1820 1821$(single-ko): single_modules 1822 @: 1823$(single-no-ko): $(build-dir) 1824 @: 1825 1826# Remove MODORDER when done because it is not the real one. 1827PHONY += single_modules 1828single_modules: $(single-no-ko) modules_prepare 1829 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER) 1830 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1831ifneq ($(KBUILD_MODPOST_NOFINAL),1) 1832 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal 1833endif 1834 $(Q)rm -f $(MODORDER) 1835 1836single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) 1837 1838endif 1839 1840# Preset locale variables to speed up the build process. Limit locale 1841# tweaks to this spot to avoid wrong language settings when running 1842# make menuconfig etc. 1843# Error messages still appears in the original language 1844PHONY += $(build-dir) 1845$(build-dir): prepare 1846 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) 1847 1848clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1849PHONY += $(clean-dirs) clean 1850$(clean-dirs): 1851 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1852 1853clean: $(clean-dirs) 1854 $(call cmd,rmfiles) 1855 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1856 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1857 -o -name '*.ko.*' \ 1858 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1859 -o -name '*.dwo' -o -name '*.lst' \ 1860 -o -name '*.su' -o -name '*.mod' -o -name '*.usyms' \ 1861 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1862 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1863 -o -name '*.asn1.[ch]' \ 1864 -o -name '*.symtypes' -o -name 'modules.order' \ 1865 -o -name '.tmp_*' \ 1866 -o -name '*.c.[012]*.*' \ 1867 -o -name '*.ll' \ 1868 -o -name '*.gcno' \ 1869 -o -name '*.*.symversions' \) -type f -print | xargs rm -f 1870 1871# Generate tags for editors 1872# --------------------------------------------------------------------------- 1873quiet_cmd_tags = GEN $@ 1874 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1875 1876tags TAGS cscope gtags: FORCE 1877 $(call cmd,tags) 1878 1879# Script to generate missing namespace dependencies 1880# --------------------------------------------------------------------------- 1881 1882PHONY += nsdeps 1883nsdeps: export KBUILD_NSDEPS=1 1884nsdeps: modules 1885 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1886 1887# Clang Tooling 1888# --------------------------------------------------------------------------- 1889 1890quiet_cmd_gen_compile_commands = GEN $@ 1891 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1892 1893$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1894 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ 1895 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1896 $(call if_changed,gen_compile_commands) 1897 1898targets += $(extmod_prefix)compile_commands.json 1899 1900PHONY += clang-tidy clang-analyzer 1901 1902ifdef CONFIG_CC_IS_CLANG 1903quiet_cmd_clang_tools = CHECK $< 1904 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1905 1906clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 1907 $(call cmd,clang_tools) 1908else 1909clang-tidy clang-analyzer: 1910 @echo "$@ requires CC=clang" >&2 1911 @false 1912endif 1913 1914# Scripts to check various things for consistency 1915# --------------------------------------------------------------------------- 1916 1917PHONY += includecheck versioncheck coccicheck export_report 1918 1919includecheck: 1920 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1921 -name '*.[hcS]' -type f -print | sort \ 1922 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1923 1924versioncheck: 1925 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1926 -name '*.[hcS]' -type f -print | sort \ 1927 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1928 1929coccicheck: 1930 $(Q)$(BASH) $(srctree)/scripts/$@ 1931 1932export_report: 1933 $(PERL) $(srctree)/scripts/export_report.pl 1934 1935PHONY += checkstack kernelrelease kernelversion image_name 1936 1937# UML needs a little special treatment here. It wants to use the host 1938# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1939# else wants $(ARCH), including people doing cross-builds, which means 1940# that $(SUBARCH) doesn't work here. 1941ifeq ($(ARCH), um) 1942CHECKSTACK_ARCH := $(SUBARCH) 1943else 1944CHECKSTACK_ARCH := $(ARCH) 1945endif 1946checkstack: 1947 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1948 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1949 1950kernelrelease: 1951 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1952 1953kernelversion: 1954 @echo $(KERNELVERSION) 1955 1956image_name: 1957 @echo $(KBUILD_IMAGE) 1958 1959quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1960 cmd_rmfiles = rm -rf $(rm-files) 1961 1962# read saved command lines for existing targets 1963existing-targets := $(wildcard $(sort $(targets))) 1964 1965-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1966 1967endif # config-build 1968endif # mixed-build 1969endif # need-sub-make 1970 1971PHONY += FORCE 1972FORCE: 1973 1974# Declare the contents of the PHONY variable as phony. We keep that 1975# information in a variable so we can use it in if_changed and friends. 1976.PHONY: $(PHONY) 1977