1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 19 4SUBLEVEL = 0 5EXTRAVERSION = -rc5 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 439HOSTPKG_CONFIG = pkg-config 440 441KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 442 -O2 -fomit-frame-pointer -std=gnu11 \ 443 -Wdeclaration-after-statement 444KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) 445KBUILD_USERLDFLAGS := $(USERLDFLAGS) 446 447KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 448KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 449KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 450KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 451 452# Make variables (CC, etc...) 453CPP = $(CC) -E 454ifneq ($(LLVM),) 455CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 456LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 457AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 458NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) 459OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) 460OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) 461READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) 462STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) 463else 464CC = $(CROSS_COMPILE)gcc 465LD = $(CROSS_COMPILE)ld 466AR = $(CROSS_COMPILE)ar 467NM = $(CROSS_COMPILE)nm 468OBJCOPY = $(CROSS_COMPILE)objcopy 469OBJDUMP = $(CROSS_COMPILE)objdump 470READELF = $(CROSS_COMPILE)readelf 471STRIP = $(CROSS_COMPILE)strip 472endif 473PAHOLE = pahole 474RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 475LEX = flex 476YACC = bison 477AWK = awk 478INSTALLKERNEL := installkernel 479DEPMOD = depmod 480PERL = perl 481PYTHON3 = python3 482CHECK = sparse 483BASH = bash 484KGZIP = gzip 485KBZIP2 = bzip2 486KLZOP = lzop 487LZMA = lzma 488LZ4 = lz4c 489XZ = xz 490ZSTD = zstd 491 492PAHOLE_FLAGS = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh) 493 494CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 495 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 496NOSTDINC_FLAGS := 497CFLAGS_MODULE = 498AFLAGS_MODULE = 499LDFLAGS_MODULE = 500CFLAGS_KERNEL = 501AFLAGS_KERNEL = 502LDFLAGS_vmlinux = 503 504# Use USERINCLUDE when you must reference the UAPI directories only. 505USERINCLUDE := \ 506 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 507 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 508 -I$(srctree)/include/uapi \ 509 -I$(objtree)/include/generated/uapi \ 510 -include $(srctree)/include/linux/compiler-version.h \ 511 -include $(srctree)/include/linux/kconfig.h 512 513# Use LINUXINCLUDE when you must reference the include/ directory. 514# Needed to be compatible with the O= option 515LINUXINCLUDE := \ 516 -I$(srctree)/arch/$(SRCARCH)/include \ 517 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 518 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 519 -I$(objtree)/include \ 520 $(USERINCLUDE) 521 522KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 523KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 524 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 525 -Werror=implicit-function-declaration -Werror=implicit-int \ 526 -Werror=return-type -Wno-format-security \ 527 -std=gnu11 528KBUILD_CPPFLAGS := -D__KERNEL__ 529KBUILD_AFLAGS_KERNEL := 530KBUILD_CFLAGS_KERNEL := 531KBUILD_AFLAGS_MODULE := -DMODULE 532KBUILD_CFLAGS_MODULE := -DMODULE 533KBUILD_LDFLAGS_MODULE := 534KBUILD_LDFLAGS := 535CLANG_FLAGS := 536 537export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG 538export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 539export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 540export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 541export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 542export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS 543 544export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 545export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 546export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 547export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 548export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 549export PAHOLE_FLAGS 550 551# Files to ignore in find ... statements 552 553export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 554 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 555 -prune -o 556export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 557 --exclude CVS --exclude .pc --exclude .hg --exclude .git 558 559# =========================================================================== 560# Rules shared between *config targets and build targets 561 562# Basic helpers built in scripts/basic/ 563PHONY += scripts_basic 564scripts_basic: 565 $(Q)$(MAKE) $(build)=scripts/basic 566 567PHONY += outputmakefile 568ifdef building_out_of_srctree 569# Before starting out-of-tree build, make sure the source tree is clean. 570# outputmakefile generates a Makefile in the output directory, if using a 571# separate output directory. This allows convenient use of make in the 572# output directory. 573# At the same time when output Makefile generated, generate .gitignore to 574# ignore whole output directory 575 576quiet_cmd_makefile = GEN Makefile 577 cmd_makefile = { \ 578 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 579 echo "include $(srctree)/Makefile"; \ 580 } > Makefile 581 582outputmakefile: 583 $(Q)if [ -f $(srctree)/.config -o \ 584 -d $(srctree)/include/config -o \ 585 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 586 echo >&2 "***"; \ 587 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 588 echo >&2 "*** in $(abs_srctree)";\ 589 echo >&2 "***"; \ 590 false; \ 591 fi 592 $(Q)ln -fsn $(srctree) source 593 $(call cmd,makefile) 594 $(Q)test -e .gitignore || \ 595 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 596endif 597 598# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 599# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 600# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 601# and from include/config/auto.conf.cmd to detect the compiler upgrade. 602CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) 603 604ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 605include $(srctree)/scripts/Makefile.clang 606endif 607 608# Include this also for config targets because some architectures need 609# cc-cross-prefix to determine CROSS_COMPILE. 610ifdef need-compiler 611include $(srctree)/scripts/Makefile.compiler 612endif 613 614ifdef config-build 615# =========================================================================== 616# *config targets only - make sure prerequisites are updated, and descend 617# in scripts/kconfig to make the *config target 618 619# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 620# KBUILD_DEFCONFIG may point out an alternative default configuration 621# used for 'make defconfig' 622include $(srctree)/arch/$(SRCARCH)/Makefile 623export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 624 625config: outputmakefile scripts_basic FORCE 626 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 627 628%config: outputmakefile scripts_basic FORCE 629 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 630 631else #!config-build 632# =========================================================================== 633# Build targets only - this includes vmlinux, arch specific targets, clean 634# targets and others. In general all targets except *config targets. 635 636# If building an external module we do not care about the all: rule 637# but instead __all depend on modules 638PHONY += all 639ifeq ($(KBUILD_EXTMOD),) 640__all: all 641else 642__all: modules 643endif 644 645# Decide whether to build built-in, modular, or both. 646# Normally, just do built-in. 647 648KBUILD_MODULES := 649KBUILD_BUILTIN := 1 650 651# If we have only "make modules", don't compile built-in objects. 652ifeq ($(MAKECMDGOALS),modules) 653 KBUILD_BUILTIN := 654endif 655 656# If we have "make <whatever> modules", compile modules 657# in addition to whatever we do anyway. 658# Just "make" or "make all" shall build modules as well 659 660ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 661 KBUILD_MODULES := 1 662endif 663 664ifeq ($(MAKECMDGOALS),) 665 KBUILD_MODULES := 1 666endif 667 668export KBUILD_MODULES KBUILD_BUILTIN 669 670ifdef need-config 671include include/config/auto.conf 672endif 673 674ifeq ($(KBUILD_EXTMOD),) 675# Objects we will link into vmlinux / subdirs we need to visit 676core-y := init/ usr/ arch/$(SRCARCH)/ 677drivers-y := drivers/ sound/ 678drivers-$(CONFIG_SAMPLES) += samples/ 679drivers-$(CONFIG_NET) += net/ 680drivers-y += virt/ 681libs-y := lib/ 682endif # KBUILD_EXTMOD 683 684# The all: target is the default when no target is given on the 685# command line. 686# This allow a user to issue only 'make' to build a kernel including modules 687# Defaults to vmlinux, but the arch makefile usually adds further targets 688all: vmlinux 689 690CFLAGS_GCOV := -fprofile-arcs -ftest-coverage 691ifdef CONFIG_CC_IS_GCC 692CFLAGS_GCOV += -fno-tree-loop-im 693endif 694export CFLAGS_GCOV 695 696# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 697ifdef CONFIG_FUNCTION_TRACER 698 CC_FLAGS_FTRACE := -pg 699endif 700 701include $(srctree)/arch/$(SRCARCH)/Makefile 702 703ifdef need-config 704ifdef may-sync-config 705# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 706# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 707# because some architectures define CROSS_COMPILE there. 708include include/config/auto.conf.cmd 709 710$(KCONFIG_CONFIG): 711 @echo >&2 '***' 712 @echo >&2 '*** Configuration file "$@" not found!' 713 @echo >&2 '***' 714 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 715 @echo >&2 '*** "make menuconfig" or "make xconfig").' 716 @echo >&2 '***' 717 @/bin/false 718 719# The actual configuration files used during the build are stored in 720# include/generated/ and include/config/. Update them if .config is newer than 721# include/config/auto.conf (which mirrors .config). 722# 723# This exploits the 'multi-target pattern rule' trick. 724# The syncconfig should be executed only once to make all the targets. 725# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 726# 727# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 728# so you cannot notice that Kconfig is waiting for the user input. 729%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 730 $(Q)$(kecho) " SYNC $@" 731 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 732else # !may-sync-config 733# External modules and some install targets need include/generated/autoconf.h 734# and include/config/auto.conf but do not care if they are up-to-date. 735# Use auto.conf to trigger the test 736PHONY += include/config/auto.conf 737 738include/config/auto.conf: 739 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 740 echo >&2; \ 741 echo >&2 " ERROR: Kernel configuration is invalid."; \ 742 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 743 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 744 echo >&2 ; \ 745 /bin/false) 746 747endif # may-sync-config 748endif # need-config 749 750KBUILD_CFLAGS += -fno-delete-null-pointer-checks 751KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 752KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 753KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 754KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 755 756ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 757KBUILD_CFLAGS += -O2 758else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 759KBUILD_CFLAGS += -O3 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 792KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH) 793 794ifdef CONFIG_CC_IS_CLANG 795KBUILD_CPPFLAGS += -Qunused-arguments 796# The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable. 797KBUILD_CFLAGS += -Wno-gnu 798else 799 800# gcc inanely warns about local variables called 'main' 801KBUILD_CFLAGS += -Wno-main 802endif 803 804# These warnings generated too much noise in a regular build. 805# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 806KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 807KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 808 809# These result in bogus false positives 810KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer) 811 812ifdef CONFIG_FRAME_POINTER 813KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 814else 815# Some targets (ARM with Thumb2, for example), can't be built with frame 816# pointers. For those, we don't have FUNCTION_TRACER automatically 817# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 818# incompatible with -fomit-frame-pointer with current GCC, so we don't use 819# -fomit-frame-pointer with FUNCTION_TRACER. 820ifndef CONFIG_FUNCTION_TRACER 821KBUILD_CFLAGS += -fomit-frame-pointer 822endif 823endif 824 825# Initialize all stack variables with a 0xAA pattern. 826ifdef CONFIG_INIT_STACK_ALL_PATTERN 827KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 828endif 829 830# Initialize all stack variables with a zero value. 831ifdef CONFIG_INIT_STACK_ALL_ZERO 832KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 833ifdef CONFIG_CC_IS_CLANG 834# https://bugs.llvm.org/show_bug.cgi?id=45497 835KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 836endif 837endif 838 839# While VLAs have been removed, GCC produces unreachable stack probes 840# for the randomize_kstack_offset feature. Disable it for all compilers. 841KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 842 843# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 844ifdef CONFIG_ZERO_CALL_USED_REGS 845KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 846endif 847 848ifdef CONFIG_FUNCTION_TRACER 849ifdef CONFIG_FTRACE_MCOUNT_USE_CC 850 CC_FLAGS_FTRACE += -mrecord-mcount 851 ifdef CONFIG_HAVE_NOP_MCOUNT 852 ifeq ($(call cc-option-yn, -mnop-mcount),y) 853 CC_FLAGS_FTRACE += -mnop-mcount 854 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 855 endif 856 endif 857endif 858ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 859 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 860endif 861ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 862 ifdef CONFIG_HAVE_C_RECORDMCOUNT 863 BUILD_C_RECORDMCOUNT := y 864 export BUILD_C_RECORDMCOUNT 865 endif 866endif 867ifdef CONFIG_HAVE_FENTRY 868 # s390-linux-gnu-gcc did not support -mfentry until gcc-9. 869 ifeq ($(call cc-option-yn, -mfentry),y) 870 CC_FLAGS_FTRACE += -mfentry 871 CC_FLAGS_USING += -DCC_USING_FENTRY 872 endif 873endif 874export CC_FLAGS_FTRACE 875KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 876KBUILD_AFLAGS += $(CC_FLAGS_USING) 877endif 878 879# We trigger additional mismatches with less inlining 880ifdef CONFIG_DEBUG_SECTION_MISMATCH 881KBUILD_CFLAGS += -fno-inline-functions-called-once 882endif 883 884ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 885KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 886LDFLAGS_vmlinux += --gc-sections 887endif 888 889ifdef CONFIG_SHADOW_CALL_STACK 890CC_FLAGS_SCS := -fsanitize=shadow-call-stack 891KBUILD_CFLAGS += $(CC_FLAGS_SCS) 892export CC_FLAGS_SCS 893endif 894 895ifdef CONFIG_LTO_CLANG 896ifdef CONFIG_LTO_CLANG_THIN 897CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 898KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache 899else 900CC_FLAGS_LTO := -flto 901endif 902CC_FLAGS_LTO += -fvisibility=hidden 903 904# Limit inlining across translation units to reduce binary size 905KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 906 907# Check for frame size exceeding threshold during prolog/epilog insertion 908# when using lld < 13.0.0. 909ifneq ($(CONFIG_FRAME_WARN),0) 910ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0) 911KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) 912endif 913endif 914endif 915 916ifdef CONFIG_LTO 917KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 918KBUILD_AFLAGS += -fno-lto 919export CC_FLAGS_LTO 920endif 921 922ifdef CONFIG_CFI_CLANG 923CC_FLAGS_CFI := -fsanitize=cfi \ 924 -fsanitize-cfi-cross-dso \ 925 -fno-sanitize-cfi-canonical-jump-tables \ 926 -fno-sanitize-trap=cfi \ 927 -fno-sanitize-blacklist 928 929ifdef CONFIG_CFI_PERMISSIVE 930CC_FLAGS_CFI += -fsanitize-recover=cfi 931endif 932 933# If LTO flags are filtered out, we must also filter out CFI. 934CC_FLAGS_LTO += $(CC_FLAGS_CFI) 935KBUILD_CFLAGS += $(CC_FLAGS_CFI) 936export CC_FLAGS_CFI 937endif 938 939ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B 940KBUILD_CFLAGS += -falign-functions=64 941endif 942 943# arch Makefile may override CC so keep this after arch Makefile is included 944NOSTDINC_FLAGS += -nostdinc 945 946# warn about C99 declaration after statement 947KBUILD_CFLAGS += -Wdeclaration-after-statement 948 949# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 950KBUILD_CFLAGS += -Wvla 951 952# disable pointer signed / unsigned warnings in gcc 4.0 953KBUILD_CFLAGS += -Wno-pointer-sign 954 955# In order to make sure new function cast mismatches are not introduced 956# in the kernel (to avoid tripping CFI checking), the kernel should be 957# globally built with -Wcast-function-type. 958KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type) 959 960# disable stringop warnings in gcc 8+ 961KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 962 963# We'll want to enable this eventually, but it's not going away for 5.7 at least 964KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 965 966# Another good warning that we'll want to enable eventually 967KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 968 969# Enabled with W=2, disabled by default as noisy 970ifdef CONFIG_CC_IS_GCC 971KBUILD_CFLAGS += -Wno-maybe-uninitialized 972endif 973 974ifdef CONFIG_CC_IS_GCC 975# The allocators already balk at large sizes, so silence the compiler 976# warnings for bounds checks involving those possible values. While 977# -Wno-alloc-size-larger-than would normally be used here, earlier versions 978# of gcc (<9.1) weirdly don't handle the option correctly when _other_ 979# warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX 980# doesn't work (as it is documented to), silently resolving to "0" prior to 981# version 9.1 (and producing an error more recently). Numeric values larger 982# than PTRDIFF_MAX also don't work prior to version 9.1, which are silently 983# ignored, continuing to default to PTRDIFF_MAX. So, left with no other 984# choice, we must perform a versioned check to disable this warning. 985# https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au 986KBUILD_CFLAGS += $(call cc-ifversion, -ge, 0901, -Wno-alloc-size-larger-than) 987endif 988 989# disable invalid "can't wrap" optimizations for signed / pointers 990KBUILD_CFLAGS += -fno-strict-overflow 991 992# Make sure -fstack-check isn't enabled (like gentoo apparently did) 993KBUILD_CFLAGS += -fno-stack-check 994 995# conserve stack if available 996ifdef CONFIG_CC_IS_GCC 997KBUILD_CFLAGS += -fconserve-stack 998endif 999 1000# Prohibit date/time macros, which would make the build non-deterministic 1001KBUILD_CFLAGS += -Werror=date-time 1002 1003# enforce correct pointer usage 1004KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 1005 1006# Require designated initializers for all marked structures 1007KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 1008 1009# change __FILE__ to the relative path from the srctree 1010KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1011 1012# include additional Makefiles when needed 1013include-y := scripts/Makefile.extrawarn 1014include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug 1015include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1016include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1017include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1018include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1019include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct 1020include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1021 1022include $(addprefix $(srctree)/, $(include-y)) 1023 1024# scripts/Makefile.gcc-plugins is intentionally included last. 1025# Do not add $(call cc-option,...) below this line. When you build the kernel 1026# from the clean source tree, the GCC plugins do not exist at this point. 1027 1028# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 1029KBUILD_CPPFLAGS += $(KCPPFLAGS) 1030KBUILD_AFLAGS += $(KAFLAGS) 1031KBUILD_CFLAGS += $(KCFLAGS) 1032 1033KBUILD_LDFLAGS_MODULE += --build-id=sha1 1034LDFLAGS_vmlinux += --build-id=sha1 1035 1036ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1037LDFLAGS_vmlinux += $(call ld-option, -X,) 1038endif 1039 1040ifeq ($(CONFIG_RELR),y) 1041LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags 1042endif 1043 1044# We never want expected sections to be placed heuristically by the 1045# linker. All sections should be explicitly named in the linker script. 1046ifdef CONFIG_LD_ORPHAN_WARN 1047LDFLAGS_vmlinux += --orphan-handling=warn 1048endif 1049 1050# Align the bit size of userspace programs with the kernel 1051KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1052KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1053 1054# make the checker run with the right architecture 1055CHECKFLAGS += --arch=$(ARCH) 1056 1057# insure the checker run with the right endianness 1058CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1059 1060# the checker needs the correct machine size 1061CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1062 1063# Default kernel image to build when no specific target is given. 1064# KBUILD_IMAGE may be overruled on the command line or 1065# set in the environment 1066# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1067# this default value 1068export KBUILD_IMAGE ?= vmlinux 1069 1070# 1071# INSTALL_PATH specifies where to place the updated kernel and system map 1072# images. Default is /boot, but you can set it to other values 1073export INSTALL_PATH ?= /boot 1074 1075# 1076# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1077# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1078# an argument if needed. Otherwise it defaults to the kernel install path 1079# 1080export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1081 1082# 1083# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1084# relocations required by build roots. This is not defined in the 1085# makefile but the argument can be passed to make if needed. 1086# 1087 1088MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1089export MODLIB 1090 1091PHONY += prepare0 1092 1093export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1094export MODORDER := $(extmod_prefix)modules.order 1095export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1096 1097ifeq ($(KBUILD_EXTMOD),) 1098core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ 1099core-$(CONFIG_BLOCK) += block/ 1100 1101vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1102 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1103 $(libs-y) $(libs-m))) 1104 1105vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1106 $(patsubst %/,%,$(filter %/, $(core-) \ 1107 $(drivers-) $(libs-)))) 1108 1109subdir-modorder := $(addsuffix modules.order,$(filter %/, \ 1110 $(core-y) $(core-m) $(libs-y) $(libs-m) \ 1111 $(drivers-y) $(drivers-m))) 1112 1113build-dirs := $(vmlinux-dirs) 1114clean-dirs := $(vmlinux-alldirs) 1115 1116# Externally visible symbols (used by link-vmlinux.sh) 1117KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1118KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1119ifdef CONFIG_MODULES 1120KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1121KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1122else 1123KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1124endif 1125KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1126 1127export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1128export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1129# used by scripts/Makefile.package 1130export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1131 1132vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1133 1134# Recurse until adjust_autoksyms.sh is satisfied 1135PHONY += autoksyms_recursive 1136ifdef CONFIG_TRIM_UNUSED_KSYMS 1137# For the kernel to actually contain only the needed exported symbols, 1138# we have to build modules as well to determine what those symbols are. 1139# (this can be evaluated only once include/config/auto.conf has been included) 1140KBUILD_MODULES := 1 1141 1142autoksyms_recursive: descend modules.order 1143 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1144 "$(MAKE) -f $(srctree)/Makefile autoksyms_recursive" 1145endif 1146 1147autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1148 1149quiet_cmd_autoksyms_h = GEN $@ 1150 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1151 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1152 1153$(autoksyms_h): 1154 $(call cmd,autoksyms_h) 1155 1156ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1157 1158# Final link of vmlinux with optional arch pass after final link 1159cmd_link-vmlinux = \ 1160 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \ 1161 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1162 1163vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1164 +$(call if_changed_dep,link-vmlinux) 1165 1166targets := vmlinux 1167 1168# The actual objects are generated when descending, 1169# make sure no implicit rule kicks in 1170$(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1171 1172filechk_kernel.release = \ 1173 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1174 1175# Store (new) KERNELRELEASE string in include/config/kernel.release 1176include/config/kernel.release: FORCE 1177 $(call filechk,kernel.release) 1178 1179# Additional helpers built in scripts/ 1180# Carefully list dependencies so we do not try to build scripts twice 1181# in parallel 1182PHONY += scripts 1183scripts: scripts_basic scripts_dtc 1184 $(Q)$(MAKE) $(build)=$(@) 1185 1186# Things we need to do before we recursively start building the kernel 1187# or the modules are listed in "prepare". 1188# A multi level approach is used. prepareN is processed before prepareN-1. 1189# archprepare is used in arch Makefiles and when processed asm symlink, 1190# version.h and scripts_basic is processed / created. 1191 1192PHONY += prepare archprepare 1193 1194archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1195 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1196 include/generated/autoconf.h remove-stale-files 1197 1198prepare0: archprepare 1199 $(Q)$(MAKE) $(build)=scripts/mod 1200 $(Q)$(MAKE) $(build)=. 1201 1202# All the preparing.. 1203prepare: prepare0 1204 1205PHONY += remove-stale-files 1206remove-stale-files: 1207 $(Q)$(srctree)/scripts/remove-stale-files 1208 1209# Support for using generic headers in asm-generic 1210asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1211 1212PHONY += asm-generic uapi-asm-generic 1213asm-generic: uapi-asm-generic 1214 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1215 generic=include/asm-generic 1216uapi-asm-generic: 1217 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1218 generic=include/uapi/asm-generic 1219 1220# Generate some files 1221# --------------------------------------------------------------------------- 1222 1223# KERNELRELEASE can change from a few different places, meaning version.h 1224# needs to be updated, so this check is forced on all builds 1225 1226uts_len := 64 1227define filechk_utsrelease.h 1228 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1229 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1230 exit 1; \ 1231 fi; \ 1232 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1233endef 1234 1235define filechk_version.h 1236 if [ $(SUBLEVEL) -gt 255 ]; then \ 1237 echo \#define LINUX_VERSION_CODE $(shell \ 1238 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1239 else \ 1240 echo \#define LINUX_VERSION_CODE $(shell \ 1241 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1242 fi; \ 1243 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1244 ((c) > 255 ? 255 : (c)))'; \ 1245 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1246 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1247 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1248endef 1249 1250$(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0) 1251$(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0) 1252$(version_h): FORCE 1253 $(call filechk,version.h) 1254 1255include/generated/utsrelease.h: include/config/kernel.release FORCE 1256 $(call filechk,utsrelease.h) 1257 1258PHONY += headerdep 1259headerdep: 1260 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1261 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1262 1263# --------------------------------------------------------------------------- 1264# Kernel headers 1265 1266#Default location for installed headers 1267export INSTALL_HDR_PATH = $(objtree)/usr 1268 1269quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1270 cmd_headers_install = \ 1271 mkdir -p $(INSTALL_HDR_PATH); \ 1272 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1273 usr/include $(INSTALL_HDR_PATH) 1274 1275PHONY += headers_install 1276headers_install: headers 1277 $(call cmd,headers_install) 1278 1279PHONY += archheaders archscripts 1280 1281hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1282 1283PHONY += headers 1284headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1285 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1286 $(error Headers not exportable for the $(SRCARCH) architecture)) 1287 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1288 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1289 1290ifdef CONFIG_HEADERS_INSTALL 1291prepare: headers 1292endif 1293 1294PHONY += scripts_unifdef 1295scripts_unifdef: scripts_basic 1296 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1297 1298# --------------------------------------------------------------------------- 1299# Install 1300 1301# Many distributions have the custom install script, /sbin/installkernel. 1302# If DKMS is installed, 'make install' will eventually recurse back 1303# to this Makefile to build and install external modules. 1304# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1305 1306quiet_cmd_install = INSTALL $(INSTALL_PATH) 1307 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh 1308 1309# --------------------------------------------------------------------------- 1310# Tools 1311 1312ifdef CONFIG_OBJTOOL 1313prepare: tools/objtool 1314endif 1315 1316ifdef CONFIG_BPF 1317ifdef CONFIG_DEBUG_INFO_BTF 1318prepare: tools/bpf/resolve_btfids 1319endif 1320endif 1321 1322PHONY += resolve_btfids_clean 1323 1324resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1325 1326# tools/bpf/resolve_btfids directory might not exist 1327# in output directory, skip its clean in that case 1328resolve_btfids_clean: 1329ifneq ($(wildcard $(resolve_btfids_O)),) 1330 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1331endif 1332 1333# Clear a bunch of variables before executing the submake 1334ifeq ($(quiet),silent_) 1335tools_silent=s 1336endif 1337 1338tools/: FORCE 1339 $(Q)mkdir -p $(objtree)/tools 1340 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1341 1342tools/%: FORCE 1343 $(Q)mkdir -p $(objtree)/tools 1344 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1345 1346# --------------------------------------------------------------------------- 1347# Kernel selftest 1348 1349PHONY += kselftest 1350kselftest: 1351 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1352 1353kselftest-%: FORCE 1354 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1355 1356PHONY += kselftest-merge 1357kselftest-merge: 1358 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1359 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1360 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1361 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1362 1363# --------------------------------------------------------------------------- 1364# Devicetree files 1365 1366ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1367dtstree := arch/$(SRCARCH)/boot/dts 1368endif 1369 1370ifneq ($(dtstree),) 1371 1372%.dtb: include/config/kernel.release scripts_dtc 1373 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1374 1375%.dtbo: include/config/kernel.release scripts_dtc 1376 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1377 1378PHONY += dtbs dtbs_install dtbs_check 1379dtbs: include/config/kernel.release scripts_dtc 1380 $(Q)$(MAKE) $(build)=$(dtstree) 1381 1382ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1383export CHECK_DTBS=y 1384dtbs: dt_binding_check 1385endif 1386 1387dtbs_check: dtbs 1388 1389dtbs_install: 1390 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1391 1392ifdef CONFIG_OF_EARLY_FLATTREE 1393all: dtbs 1394endif 1395 1396endif 1397 1398PHONY += scripts_dtc 1399scripts_dtc: scripts_basic 1400 $(Q)$(MAKE) $(build)=scripts/dtc 1401 1402ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1403export CHECK_DT_BINDING=y 1404endif 1405 1406PHONY += dt_binding_check 1407dt_binding_check: scripts_dtc 1408 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1409 1410# --------------------------------------------------------------------------- 1411# Modules 1412 1413ifdef CONFIG_MODULES 1414 1415# By default, build modules as well 1416 1417all: modules 1418 1419# When we're building modules with modversions, we need to consider 1420# the built-in objects during the descend as well, in order to 1421# make sure the checksums are up to date before we record them. 1422ifdef CONFIG_MODVERSIONS 1423 KBUILD_BUILTIN := 1 1424endif 1425 1426# Build modules 1427# 1428# A module can be listed more than once in obj-m resulting in 1429# duplicate lines in modules.order files. Those are removed 1430# using awk while concatenating to the final file. 1431 1432PHONY += modules 1433modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare 1434 1435cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1436 1437modules.order: $(subdir-modorder) FORCE 1438 $(call if_changed,modules_order) 1439 1440targets += modules.order 1441 1442# Target to prepare building external modules 1443PHONY += modules_prepare 1444modules_prepare: prepare 1445 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1446 1447export modules_sign_only := 1448 1449ifeq ($(CONFIG_MODULE_SIG),y) 1450PHONY += modules_sign 1451modules_sign: modules_install 1452 @: 1453 1454# modules_sign is a subset of modules_install. 1455# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1456ifeq ($(filter modules_install,$(MAKECMDGOALS)),) 1457modules_sign_only := y 1458endif 1459endif 1460 1461modinst_pre := 1462ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 1463modinst_pre := __modinst_pre 1464endif 1465 1466modules_install: $(modinst_pre) 1467PHONY += __modinst_pre 1468__modinst_pre: 1469 @rm -rf $(MODLIB)/kernel 1470 @rm -f $(MODLIB)/source 1471 @mkdir -p $(MODLIB)/kernel 1472 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1473 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1474 rm -f $(MODLIB)/build ; \ 1475 ln -s $(CURDIR) $(MODLIB)/build ; \ 1476 fi 1477 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1478 @cp -f modules.builtin $(MODLIB)/ 1479 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1480 1481endif # CONFIG_MODULES 1482 1483### 1484# Cleaning is done on three levels. 1485# make clean Delete most generated files 1486# Leave enough to build external modules 1487# make mrproper Delete the current configuration, and all generated files 1488# make distclean Remove editor backup files, patch leftover files and the like 1489 1490# Directories & files removed with 'make clean' 1491CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ 1492 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1493 compile_commands.json .thinlto-cache 1494 1495# Directories & files removed with 'make mrproper' 1496MRPROPER_FILES += include/config include/generated \ 1497 arch/$(SRCARCH)/include/generated .objdiff \ 1498 debian snap tar-install \ 1499 .config .config.old .version \ 1500 Module.symvers \ 1501 certs/signing_key.pem \ 1502 certs/x509.genkey \ 1503 vmlinux-gdb.py \ 1504 *.spec 1505 1506# clean - Delete most, but leave enough to build external modules 1507# 1508clean: rm-files := $(CLEAN_FILES) 1509 1510PHONY += archclean vmlinuxclean 1511 1512vmlinuxclean: 1513 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1514 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1515 1516clean: archclean vmlinuxclean resolve_btfids_clean 1517 1518# mrproper - Delete all generated files, including .config 1519# 1520mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1521mrproper-dirs := $(addprefix _mrproper_,scripts) 1522 1523PHONY += $(mrproper-dirs) mrproper 1524$(mrproper-dirs): 1525 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1526 1527mrproper: clean $(mrproper-dirs) 1528 $(call cmd,rmfiles) 1529 1530# distclean 1531# 1532PHONY += distclean 1533 1534distclean: mrproper 1535 @find . $(RCS_FIND_IGNORE) \ 1536 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1537 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1538 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1539 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1540 -type f -print | xargs rm -f 1541 1542 1543# Packaging of the kernel to various formats 1544# --------------------------------------------------------------------------- 1545 1546%src-pkg: FORCE 1547 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1548%pkg: include/config/kernel.release FORCE 1549 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1550 1551# Brief documentation of the typical targets used 1552# --------------------------------------------------------------------------- 1553 1554boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1555boards := $(sort $(notdir $(boards))) 1556board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1557board-dirs := $(sort $(notdir $(board-dirs:/=))) 1558 1559PHONY += help 1560help: 1561 @echo 'Cleaning targets:' 1562 @echo ' clean - Remove most generated files but keep the config and' 1563 @echo ' enough build support to build external modules' 1564 @echo ' mrproper - Remove all generated files + config + various backup files' 1565 @echo ' distclean - mrproper + remove editor backup and patch files' 1566 @echo '' 1567 @echo 'Configuration targets:' 1568 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1569 @echo '' 1570 @echo 'Other generic targets:' 1571 @echo ' all - Build all targets marked with [*]' 1572 @echo '* vmlinux - Build the bare kernel' 1573 @echo '* modules - Build all modules' 1574 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1575 @echo ' dir/ - Build all files in dir and below' 1576 @echo ' dir/file.[ois] - Build specified target only' 1577 @echo ' dir/file.ll - Build the LLVM assembly file' 1578 @echo ' (requires compiler support for LLVM assembly generation)' 1579 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1580 @echo ' (requires a recent binutils and recent build (System.map))' 1581 @echo ' dir/file.ko - Build module including final link' 1582 @echo ' modules_prepare - Set up for building external modules' 1583 @echo ' tags/TAGS - Generate tags file for editors' 1584 @echo ' cscope - Generate cscope index' 1585 @echo ' gtags - Generate GNU GLOBAL index' 1586 @echo ' kernelrelease - Output the release version string (use with make -s)' 1587 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1588 @echo ' image_name - Output the image name (use with make -s)' 1589 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1590 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1591 echo '' 1592 @echo 'Static analysers:' 1593 @echo ' checkstack - Generate a list of stack hogs' 1594 @echo ' versioncheck - Sanity check on version.h usage' 1595 @echo ' includecheck - Check for duplicate included header files' 1596 @echo ' export_report - List the usages of all exported symbols' 1597 @echo ' headerdep - Detect inclusion cycles in headers' 1598 @echo ' coccicheck - Check with Coccinelle' 1599 @echo ' clang-analyzer - Check with clang static analyzer' 1600 @echo ' clang-tidy - Check with clang-tidy' 1601 @echo '' 1602 @echo 'Tools:' 1603 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1604 @echo '' 1605 @echo 'Kernel selftest:' 1606 @echo ' kselftest - Build and run kernel selftest' 1607 @echo ' Build, install, and boot kernel before' 1608 @echo ' running kselftest on it' 1609 @echo ' Run as root for full coverage' 1610 @echo ' kselftest-all - Build kernel selftest' 1611 @echo ' kselftest-install - Build and install kernel selftest' 1612 @echo ' kselftest-clean - Remove all generated kselftest files' 1613 @echo ' kselftest-merge - Merge all the config dependencies of' 1614 @echo ' kselftest to existing .config.' 1615 @echo '' 1616 @$(if $(dtstree), \ 1617 echo 'Devicetree:'; \ 1618 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1619 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1620 echo ' dt_binding_check - Validate device tree binding documents'; \ 1621 echo ' dtbs_check - Validate device tree source files';\ 1622 echo '') 1623 1624 @echo 'Userspace tools targets:' 1625 @echo ' use "make tools/help"' 1626 @echo ' or "cd tools; make help"' 1627 @echo '' 1628 @echo 'Kernel packaging:' 1629 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1630 @echo '' 1631 @echo 'Documentation targets:' 1632 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1633 @echo '' 1634 @echo 'Architecture specific targets ($(SRCARCH)):' 1635 @$(or $(archhelp),\ 1636 echo ' No architecture specific help defined for $(SRCARCH)') 1637 @echo '' 1638 @$(if $(boards), \ 1639 $(foreach b, $(boards), \ 1640 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1641 echo '') 1642 @$(if $(board-dirs), \ 1643 $(foreach b, $(board-dirs), \ 1644 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1645 printf " %-16s - Show all of the above\\n" help-boards; \ 1646 echo '') 1647 1648 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1649 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1650 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1651 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1652 @echo ' (sparse by default)' 1653 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1654 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1655 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1656 @echo ' 1: warnings which may be relevant and do not occur too often' 1657 @echo ' 2: warnings which occur quite often but may still be relevant' 1658 @echo ' 3: more obscure warnings, can most likely be ignored' 1659 @echo ' e: warnings are being treated as errors' 1660 @echo ' Multiple levels can be combined with W=12 or W=123' 1661 @echo '' 1662 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1663 @echo 'For further info see the ./README file' 1664 1665 1666help-board-dirs := $(addprefix help-,$(board-dirs)) 1667 1668help-boards: $(help-board-dirs) 1669 1670boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1671 1672$(help-board-dirs): help-%: 1673 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1674 @$(if $(boards-per-dir), \ 1675 $(foreach b, $(boards-per-dir), \ 1676 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1677 echo '') 1678 1679 1680# Documentation targets 1681# --------------------------------------------------------------------------- 1682DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1683 linkcheckdocs dochelp refcheckdocs 1684PHONY += $(DOC_TARGETS) 1685$(DOC_TARGETS): 1686 $(Q)$(MAKE) $(build)=Documentation $@ 1687 1688# Misc 1689# --------------------------------------------------------------------------- 1690 1691PHONY += scripts_gdb 1692scripts_gdb: prepare0 1693 $(Q)$(MAKE) $(build)=scripts/gdb 1694 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1695 1696ifdef CONFIG_GDB_SCRIPTS 1697all: scripts_gdb 1698endif 1699 1700else # KBUILD_EXTMOD 1701 1702### 1703# External module support. 1704# When building external modules the kernel used as basis is considered 1705# read-only, and no consistency checks are made and the make 1706# system is not used on the basis kernel. If updates are required 1707# in the basis kernel ordinary make commands (without M=...) must be used. 1708 1709# We are always building only modules. 1710KBUILD_BUILTIN := 1711KBUILD_MODULES := 1 1712 1713build-dirs := $(KBUILD_EXTMOD) 1714$(MODORDER): descend 1715 @: 1716 1717compile_commands.json: $(extmod_prefix)compile_commands.json 1718PHONY += compile_commands.json 1719 1720clean-dirs := $(KBUILD_EXTMOD) 1721clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1722 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1723 1724PHONY += prepare 1725# now expand this into a simple variable to reduce the cost of shell evaluations 1726prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) 1727prepare: 1728 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ 1729 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ 1730 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ 1731 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ 1732 fi 1733 1734PHONY += help 1735help: 1736 @echo ' Building external modules.' 1737 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1738 @echo '' 1739 @echo ' modules - default target, build the module(s)' 1740 @echo ' modules_install - install the module' 1741 @echo ' clean - remove generated files in module directory only' 1742 @echo '' 1743 1744# no-op for external module builds 1745PHONY += modules_prepare 1746 1747endif # KBUILD_EXTMOD 1748 1749# --------------------------------------------------------------------------- 1750# Modules 1751 1752PHONY += modules modules_install 1753 1754ifdef CONFIG_MODULES 1755 1756modules: modules_check 1757 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1758 1759PHONY += modules_check 1760modules_check: $(MODORDER) 1761 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1762 1763quiet_cmd_depmod = DEPMOD $(MODLIB) 1764 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1765 $(KERNELRELEASE) 1766 1767modules_install: 1768 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1769 $(call cmd,depmod) 1770 1771else # CONFIG_MODULES 1772 1773# Modules not configured 1774# --------------------------------------------------------------------------- 1775 1776modules modules_install: 1777 @echo >&2 '***' 1778 @echo >&2 '*** The present kernel configuration has modules disabled.' 1779 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.' 1780 @echo >&2 '*** to enable CONFIG_MODULES.' 1781 @echo >&2 '***' 1782 @exit 1 1783 1784endif # CONFIG_MODULES 1785 1786# Single targets 1787# --------------------------------------------------------------------------- 1788# To build individual files in subdirectories, you can do like this: 1789# 1790# make foo/bar/baz.s 1791# 1792# The supported suffixes for single-target are listed in 'single-targets' 1793# 1794# To build only under specific subdirectories, you can do like this: 1795# 1796# make foo/bar/baz/ 1797 1798ifdef single-build 1799 1800# .ko is special because modpost is needed 1801single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1802single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ 1803 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) 1804 1805$(single-ko): single_modpost 1806 @: 1807$(single-no-ko): descend 1808 @: 1809 1810ifeq ($(KBUILD_EXTMOD),) 1811# For the single build of in-tree modules, use a temporary file to avoid 1812# the situation of modules_install installing an invalid modules.order. 1813MODORDER := .modules.tmp 1814endif 1815 1816PHONY += single_modpost 1817single_modpost: $(single-no-ko) modules_prepare 1818 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER) 1819 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1820 1821KBUILD_MODULES := 1 1822 1823export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod_prefix), $(single-no-ko)) 1824 1825# trim unrelated directories 1826build-dirs := $(foreach d, $(build-dirs), \ 1827 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1828 1829endif 1830 1831ifndef CONFIG_MODULES 1832KBUILD_MODULES := 1833endif 1834 1835# Handle descending into subdirectories listed in $(build-dirs) 1836# Preset locale variables to speed up the build process. Limit locale 1837# tweaks to this spot to avoid wrong language settings when running 1838# make menuconfig etc. 1839# Error messages still appears in the original language 1840PHONY += descend $(build-dirs) 1841descend: $(build-dirs) 1842$(build-dirs): prepare 1843 $(Q)$(MAKE) $(build)=$@ \ 1844 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ 1845 need-builtin=1 need-modorder=1 1846 1847clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1848PHONY += $(clean-dirs) clean 1849$(clean-dirs): 1850 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1851 1852clean: $(clean-dirs) 1853 $(call cmd,rmfiles) 1854 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1855 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1856 -o -name '*.ko.*' \ 1857 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1858 -o -name '*.dwo' -o -name '*.lst' \ 1859 -o -name '*.su' -o -name '*.mod' -o -name '*.usyms' \ 1860 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1861 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1862 -o -name '*.asn1.[ch]' \ 1863 -o -name '*.symtypes' -o -name 'modules.order' \ 1864 -o -name '.tmp_*' \ 1865 -o -name '*.c.[012]*.*' \ 1866 -o -name '*.ll' \ 1867 -o -name '*.gcno' \ 1868 -o -name '*.*.symversions' \) -type f -print | xargs rm -f 1869 1870# Generate tags for editors 1871# --------------------------------------------------------------------------- 1872quiet_cmd_tags = GEN $@ 1873 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1874 1875tags TAGS cscope gtags: FORCE 1876 $(call cmd,tags) 1877 1878# Script to generate missing namespace dependencies 1879# --------------------------------------------------------------------------- 1880 1881PHONY += nsdeps 1882nsdeps: export KBUILD_NSDEPS=1 1883nsdeps: modules 1884 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1885 1886# Clang Tooling 1887# --------------------------------------------------------------------------- 1888 1889quiet_cmd_gen_compile_commands = GEN $@ 1890 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1891 1892$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1893 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \ 1894 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1895 $(call if_changed,gen_compile_commands) 1896 1897targets += $(extmod_prefix)compile_commands.json 1898 1899PHONY += clang-tidy clang-analyzer 1900 1901ifdef CONFIG_CC_IS_CLANG 1902quiet_cmd_clang_tools = CHECK $< 1903 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1904 1905clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 1906 $(call cmd,clang_tools) 1907else 1908clang-tidy clang-analyzer: 1909 @echo "$@ requires CC=clang" >&2 1910 @false 1911endif 1912 1913# Scripts to check various things for consistency 1914# --------------------------------------------------------------------------- 1915 1916PHONY += includecheck versioncheck coccicheck export_report 1917 1918includecheck: 1919 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1920 -name '*.[hcS]' -type f -print | sort \ 1921 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1922 1923versioncheck: 1924 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1925 -name '*.[hcS]' -type f -print | sort \ 1926 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1927 1928coccicheck: 1929 $(Q)$(BASH) $(srctree)/scripts/$@ 1930 1931export_report: 1932 $(PERL) $(srctree)/scripts/export_report.pl 1933 1934PHONY += checkstack kernelrelease kernelversion image_name 1935 1936# UML needs a little special treatment here. It wants to use the host 1937# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1938# else wants $(ARCH), including people doing cross-builds, which means 1939# that $(SUBARCH) doesn't work here. 1940ifeq ($(ARCH), um) 1941CHECKSTACK_ARCH := $(SUBARCH) 1942else 1943CHECKSTACK_ARCH := $(ARCH) 1944endif 1945checkstack: 1946 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1947 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1948 1949kernelrelease: 1950 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1951 1952kernelversion: 1953 @echo $(KERNELVERSION) 1954 1955image_name: 1956 @echo $(KBUILD_IMAGE) 1957 1958quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1959 cmd_rmfiles = rm -rf $(rm-files) 1960 1961# read saved command lines for existing targets 1962existing-targets := $(wildcard $(sort $(targets))) 1963 1964-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1965 1966endif # config-build 1967endif # mixed-build 1968endif # need-sub-make 1969 1970PHONY += FORCE 1971FORCE: 1972 1973# Declare the contents of the PHONY variable as phony. We keep that 1974# information in a variable so we can use it in if_changed and friends. 1975.PHONY: $(PHONY) 1976