1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 14 4SUBLEVEL = 0 5EXTRAVERSION = 6NAME = Opossums on Parade 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),$(abs_objtree)) 192# Look for make include files relative to root of kernel src 193# 194# This does not become effective immediately because MAKEFLAGS is re-parsed 195# once after the Makefile is read. We need to invoke sub-make. 196MAKEFLAGS += --include-dir=$(abs_srctree) 197need-sub-make := 1 198endif 199 200ifneq ($(filter 3.%,$(MAKE_VERSION)),) 201# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 202# We need to invoke sub-make to avoid implicit rules in the top Makefile. 203need-sub-make := 1 204# Cancel implicit rules for this Makefile. 205$(this-makefile): ; 206endif 207 208export abs_srctree abs_objtree 209export sub_make_done := 1 210 211ifeq ($(need-sub-make),1) 212 213PHONY += $(MAKECMDGOALS) __sub-make 214 215$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 216 @: 217 218# Invoke a second make in the output directory, passing relevant variables 219__sub-make: 220 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 221 222endif # need-sub-make 223endif # sub_make_done 224 225# We process the rest of the Makefile if this is the final invocation of make 226ifeq ($(need-sub-make),) 227 228# Do not print "Entering directory ...", 229# but we want to display it when entering to the output directory 230# so that IDEs/editors are able to understand relative filenames. 231MAKEFLAGS += --no-print-directory 232 233ifeq ($(abs_srctree),$(abs_objtree)) 234 # building in the source tree 235 srctree := . 236 building_out_of_srctree := 237else 238 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 239 # building in a subdirectory of the source tree 240 srctree := .. 241 else 242 srctree := $(abs_srctree) 243 endif 244 building_out_of_srctree := 1 245endif 246 247ifneq ($(KBUILD_ABS_SRCTREE),) 248srctree := $(abs_srctree) 249endif 250 251objtree := . 252VPATH := $(srctree) 253 254export building_out_of_srctree srctree objtree VPATH 255 256# To make sure we do not include .config for any of the *config targets 257# catch them early, and hand them over to scripts/kconfig/Makefile 258# It is allowed to specify more targets when calling make, including 259# mixing *config targets and build targets. 260# For example 'make oldconfig all'. 261# Detect when mixed targets is specified, and make a second invocation 262# of make so .config is not included in this case either (for *config). 263 264version_h := include/generated/uapi/linux/version.h 265 266clean-targets := %clean mrproper cleandocs 267no-dot-config-targets := $(clean-targets) \ 268 cscope gtags TAGS tags help% %docs check% coccicheck \ 269 $(version_h) headers headers_% archheaders archscripts \ 270 %asm-generic kernelversion %src-pkg dt_binding_check \ 271 outputmakefile 272# Installation targets should not require compiler. Unfortunately, vdso_install 273# is an exception where build artifacts may be updated. This must be fixed. 274no-compiler-targets := $(no-dot-config-targets) install dtbs_install \ 275 headers_install modules_install kernelrelease image_name 276no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \ 277 image_name 278single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ 279 280config-build := 281mixed-build := 282need-config := 1 283need-compiler := 1 284may-sync-config := 1 285single-build := 286 287ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 288 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 289 need-config := 290 endif 291endif 292 293ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),) 294 ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),) 295 need-compiler := 296 endif 297endif 298 299ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 300 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 301 may-sync-config := 302 endif 303endif 304 305ifneq ($(KBUILD_EXTMOD),) 306 may-sync-config := 307endif 308 309ifeq ($(KBUILD_EXTMOD),) 310 ifneq ($(filter %config,$(MAKECMDGOALS)),) 311 config-build := 1 312 ifneq ($(words $(MAKECMDGOALS)),1) 313 mixed-build := 1 314 endif 315 endif 316endif 317 318# We cannot build single targets and the others at the same time 319ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 320 single-build := 1 321 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 322 mixed-build := 1 323 endif 324endif 325 326# For "make -j clean all", "make -j mrproper defconfig all", etc. 327ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 328 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 329 mixed-build := 1 330 endif 331endif 332 333# install and modules_install need also be processed one by one 334ifneq ($(filter install,$(MAKECMDGOALS)),) 335 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 336 mixed-build := 1 337 endif 338endif 339 340ifdef mixed-build 341# =========================================================================== 342# We're called with mixed targets (*config and build targets). 343# Handle them one by one. 344 345PHONY += $(MAKECMDGOALS) __build_one_by_one 346 347$(MAKECMDGOALS): __build_one_by_one 348 @: 349 350__build_one_by_one: 351 $(Q)set -e; \ 352 for i in $(MAKECMDGOALS); do \ 353 $(MAKE) -f $(srctree)/Makefile $$i; \ 354 done 355 356else # !mixed-build 357 358include $(srctree)/scripts/Kbuild.include 359 360# Read KERNELRELEASE from include/config/kernel.release (if it exists) 361KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 362KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 363export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 364 365include $(srctree)/scripts/subarch.include 366 367# Cross compiling and selecting different set of gcc/bin-utils 368# --------------------------------------------------------------------------- 369# 370# When performing cross compilation for other architectures ARCH shall be set 371# to the target architecture. (See arch/* for the possibilities). 372# ARCH can be set during invocation of make: 373# make ARCH=ia64 374# Another way is to have ARCH set in the environment. 375# The default ARCH is the host where make is executed. 376 377# CROSS_COMPILE specify the prefix used for all executables used 378# during compilation. Only gcc and related bin-utils executables 379# are prefixed with $(CROSS_COMPILE). 380# CROSS_COMPILE can be set on the command line 381# make CROSS_COMPILE=ia64-linux- 382# Alternatively CROSS_COMPILE can be set in the environment. 383# Default value for CROSS_COMPILE is not to prefix executables 384# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 385ARCH ?= $(SUBARCH) 386 387# Architecture as present in compile.h 388UTS_MACHINE := $(ARCH) 389SRCARCH := $(ARCH) 390 391# Additional ARCH settings for x86 392ifeq ($(ARCH),i386) 393 SRCARCH := x86 394endif 395ifeq ($(ARCH),x86_64) 396 SRCARCH := x86 397endif 398 399# Additional ARCH settings for sparc 400ifeq ($(ARCH),sparc32) 401 SRCARCH := sparc 402endif 403ifeq ($(ARCH),sparc64) 404 SRCARCH := sparc 405endif 406 407# Additional ARCH settings for parisc 408ifeq ($(ARCH),parisc64) 409 SRCARCH := parisc 410endif 411 412export cross_compiling := 413ifneq ($(SRCARCH),$(SUBARCH)) 414cross_compiling := 1 415endif 416 417KCONFIG_CONFIG ?= .config 418export KCONFIG_CONFIG 419 420# SHELL used by kbuild 421CONFIG_SHELL := sh 422 423HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 424HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 425HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 426 427ifneq ($(LLVM),) 428HOSTCC = clang 429HOSTCXX = clang++ 430else 431HOSTCC = gcc 432HOSTCXX = g++ 433endif 434 435export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 436 -O2 -fomit-frame-pointer -std=gnu89 437export KBUILD_USERLDFLAGS := 438 439KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 440KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 441KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 442KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 443 444# Make variables (CC, etc...) 445CPP = $(CC) -E 446ifneq ($(LLVM),) 447CC = clang 448LD = ld.lld 449AR = llvm-ar 450NM = llvm-nm 451OBJCOPY = llvm-objcopy 452OBJDUMP = llvm-objdump 453READELF = llvm-readelf 454STRIP = llvm-strip 455else 456CC = $(CROSS_COMPILE)gcc 457LD = $(CROSS_COMPILE)ld 458AR = $(CROSS_COMPILE)ar 459NM = $(CROSS_COMPILE)nm 460OBJCOPY = $(CROSS_COMPILE)objcopy 461OBJDUMP = $(CROSS_COMPILE)objdump 462READELF = $(CROSS_COMPILE)readelf 463STRIP = $(CROSS_COMPILE)strip 464endif 465PAHOLE = pahole 466RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 467LEX = flex 468YACC = bison 469AWK = awk 470INSTALLKERNEL := installkernel 471DEPMOD = depmod 472PERL = perl 473PYTHON3 = python3 474CHECK = sparse 475BASH = bash 476KGZIP = gzip 477KBZIP2 = bzip2 478KLZOP = lzop 479LZMA = lzma 480LZ4 = lz4c 481XZ = xz 482ZSTD = zstd 483 484CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 485 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 486NOSTDINC_FLAGS := 487CFLAGS_MODULE = 488AFLAGS_MODULE = 489LDFLAGS_MODULE = 490CFLAGS_KERNEL = 491AFLAGS_KERNEL = 492LDFLAGS_vmlinux = 493 494# Use USERINCLUDE when you must reference the UAPI directories only. 495USERINCLUDE := \ 496 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 497 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 498 -I$(srctree)/include/uapi \ 499 -I$(objtree)/include/generated/uapi \ 500 -include $(srctree)/include/linux/compiler-version.h \ 501 -include $(srctree)/include/linux/kconfig.h 502 503# Use LINUXINCLUDE when you must reference the include/ directory. 504# Needed to be compatible with the O= option 505LINUXINCLUDE := \ 506 -I$(srctree)/arch/$(SRCARCH)/include \ 507 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 508 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 509 -I$(objtree)/include \ 510 $(USERINCLUDE) 511 512KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 513KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 514 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 515 -Werror=implicit-function-declaration -Werror=implicit-int \ 516 -Werror=return-type -Wno-format-security \ 517 -std=gnu89 518KBUILD_CPPFLAGS := -D__KERNEL__ 519KBUILD_AFLAGS_KERNEL := 520KBUILD_CFLAGS_KERNEL := 521KBUILD_AFLAGS_MODULE := -DMODULE 522KBUILD_CFLAGS_MODULE := -DMODULE 523KBUILD_LDFLAGS_MODULE := 524KBUILD_LDFLAGS := 525CLANG_FLAGS := 526 527export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 528export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 529export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 530export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 531export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 532 533export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 534export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 535export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 536export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 537export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 538 539# Files to ignore in find ... statements 540 541export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 542 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 543 -prune -o 544export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 545 --exclude CVS --exclude .pc --exclude .hg --exclude .git 546 547# =========================================================================== 548# Rules shared between *config targets and build targets 549 550# Basic helpers built in scripts/basic/ 551PHONY += scripts_basic 552scripts_basic: 553 $(Q)$(MAKE) $(build)=scripts/basic 554 555PHONY += outputmakefile 556ifdef building_out_of_srctree 557# Before starting out-of-tree build, make sure the source tree is clean. 558# outputmakefile generates a Makefile in the output directory, if using a 559# separate output directory. This allows convenient use of make in the 560# output directory. 561# At the same time when output Makefile generated, generate .gitignore to 562# ignore whole output directory 563 564quiet_cmd_makefile = GEN Makefile 565 cmd_makefile = { \ 566 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ 567 echo "include $(srctree)/Makefile"; \ 568 } > Makefile 569 570outputmakefile: 571 $(Q)if [ -f $(srctree)/.config -o \ 572 -d $(srctree)/include/config -o \ 573 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 574 echo >&2 "***"; \ 575 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 576 echo >&2 "*** in $(abs_srctree)";\ 577 echo >&2 "***"; \ 578 false; \ 579 fi 580 $(Q)ln -fsn $(srctree) source 581 $(call cmd,makefile) 582 $(Q)test -e .gitignore || \ 583 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 584endif 585 586# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 587# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 588# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 589# and from include/config/auto.conf.cmd to detect the compiler upgrade. 590CC_VERSION_TEXT = $(subst $(pound),,$(shell $(CC) --version 2>/dev/null | head -n 1)) 591 592ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) 593ifneq ($(CROSS_COMPILE),) 594CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) 595endif 596ifeq ($(LLVM_IAS),1) 597CLANG_FLAGS += -integrated-as 598else 599CLANG_FLAGS += -no-integrated-as 600GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 601CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE)) 602endif 603CLANG_FLAGS += -Werror=unknown-warning-option 604KBUILD_CFLAGS += $(CLANG_FLAGS) 605KBUILD_AFLAGS += $(CLANG_FLAGS) 606export CLANG_FLAGS 607endif 608 609# Include this also for config targets because some architectures need 610# cc-cross-prefix to determine CROSS_COMPILE. 611ifdef need-compiler 612include $(srctree)/scripts/Makefile.compiler 613endif 614 615ifdef config-build 616# =========================================================================== 617# *config targets only - make sure prerequisites are updated, and descend 618# in scripts/kconfig to make the *config target 619 620# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 621# KBUILD_DEFCONFIG may point out an alternative default configuration 622# used for 'make defconfig' 623include $(srctree)/arch/$(SRCARCH)/Makefile 624export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 625 626config: outputmakefile scripts_basic FORCE 627 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 628 629%config: outputmakefile scripts_basic FORCE 630 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 631 632else #!config-build 633# =========================================================================== 634# Build targets only - this includes vmlinux, arch specific targets, clean 635# targets and others. In general all targets except *config targets. 636 637# If building an external module we do not care about the all: rule 638# but instead __all depend on modules 639PHONY += all 640ifeq ($(KBUILD_EXTMOD),) 641__all: all 642else 643__all: modules 644endif 645 646# Decide whether to build built-in, modular, or both. 647# Normally, just do built-in. 648 649KBUILD_MODULES := 650KBUILD_BUILTIN := 1 651 652# If we have only "make modules", don't compile built-in objects. 653ifeq ($(MAKECMDGOALS),modules) 654 KBUILD_BUILTIN := 655endif 656 657# If we have "make <whatever> modules", compile modules 658# in addition to whatever we do anyway. 659# Just "make" or "make all" shall build modules as well 660 661ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 662 KBUILD_MODULES := 1 663endif 664 665ifeq ($(MAKECMDGOALS),) 666 KBUILD_MODULES := 1 667endif 668 669export KBUILD_MODULES KBUILD_BUILTIN 670 671ifdef need-config 672include include/config/auto.conf 673endif 674 675ifeq ($(KBUILD_EXTMOD),) 676# Objects we will link into vmlinux / subdirs we need to visit 677core-y := init/ usr/ arch/$(SRCARCH)/ 678drivers-y := drivers/ sound/ 679drivers-$(CONFIG_SAMPLES) += samples/ 680drivers-$(CONFIG_NET) += net/ 681drivers-y += virt/ 682libs-y := lib/ 683endif # KBUILD_EXTMOD 684 685# The all: target is the default when no target is given on the 686# command line. 687# This allow a user to issue only 'make' to build a kernel including modules 688# Defaults to vmlinux, but the arch makefile usually adds further targets 689all: vmlinux 690 691CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 692 $(call cc-option,-fno-tree-loop-im) \ 693 $(call cc-disable-warning,maybe-uninitialized,) 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 701RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 702RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 703RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 704RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 705RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 706RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 707export RETPOLINE_CFLAGS 708export RETPOLINE_VDSO_CFLAGS 709 710include $(srctree)/arch/$(SRCARCH)/Makefile 711 712ifdef need-config 713ifdef may-sync-config 714# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 715# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 716# because some architectures define CROSS_COMPILE there. 717include include/config/auto.conf.cmd 718 719$(KCONFIG_CONFIG): 720 @echo >&2 '***' 721 @echo >&2 '*** Configuration file "$@" not found!' 722 @echo >&2 '***' 723 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 724 @echo >&2 '*** "make menuconfig" or "make xconfig").' 725 @echo >&2 '***' 726 @/bin/false 727 728# The actual configuration files used during the build are stored in 729# include/generated/ and include/config/. Update them if .config is newer than 730# include/config/auto.conf (which mirrors .config). 731# 732# This exploits the 'multi-target pattern rule' trick. 733# The syncconfig should be executed only once to make all the targets. 734# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 735# 736# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, 737# so you cannot notice that Kconfig is waiting for the user input. 738%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 739 $(Q)$(kecho) " SYNC $@" 740 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 741else # !may-sync-config 742# External modules and some install targets need include/generated/autoconf.h 743# and include/config/auto.conf but do not care if they are up-to-date. 744# Use auto.conf to trigger the test 745PHONY += include/config/auto.conf 746 747include/config/auto.conf: 748 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 749 echo >&2; \ 750 echo >&2 " ERROR: Kernel configuration is invalid."; \ 751 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 752 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 753 echo >&2 ; \ 754 /bin/false) 755 756endif # may-sync-config 757endif # need-config 758 759KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 760KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 761KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 762KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 763KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 764 765ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 766KBUILD_CFLAGS += -O2 767else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 768KBUILD_CFLAGS += -O3 769else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 770KBUILD_CFLAGS += -Os 771endif 772 773# Tell gcc to never replace conditional load with a non-conditional one 774KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 775KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 776 777ifdef CONFIG_READABLE_ASM 778# Disable optimizations that make assembler listings hard to read. 779# reorder blocks reorders the control in the function 780# ipa clone creates specialized cloned functions 781# partial inlining inlines only parts of functions 782KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 783 $(call cc-option,-fno-ipa-cp-clone,) \ 784 $(call cc-option,-fno-partial-inlining) 785endif 786 787ifneq ($(CONFIG_FRAME_WARN),0) 788KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 789endif 790 791stackp-flags-y := -fno-stack-protector 792stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 793stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 794 795KBUILD_CFLAGS += $(stackp-flags-y) 796 797ifdef CONFIG_CC_IS_CLANG 798KBUILD_CPPFLAGS += -Qunused-arguments 799KBUILD_CFLAGS += -Wno-format-invalid-specifier 800KBUILD_CFLAGS += -Wno-gnu 801# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 802# source of a reference will be _MergedGlobals and not on of the whitelisted names. 803# See modpost pattern 2 804KBUILD_CFLAGS += -mno-global-merge 805else 806 807# Warn about unmarked fall-throughs in switch statement. 808# Disabled for clang while comment to attribute conversion happens and 809# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed. 810KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough=5,) 811endif 812 813# These warnings generated too much noise in a regular build. 814# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 815KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 816 817KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 818ifdef CONFIG_FRAME_POINTER 819KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 820else 821# Some targets (ARM with Thumb2, for example), can't be built with frame 822# pointers. For those, we don't have FUNCTION_TRACER automatically 823# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 824# incompatible with -fomit-frame-pointer with current GCC, so we don't use 825# -fomit-frame-pointer with FUNCTION_TRACER. 826ifndef CONFIG_FUNCTION_TRACER 827KBUILD_CFLAGS += -fomit-frame-pointer 828endif 829endif 830 831# Initialize all stack variables with a 0xAA pattern. 832ifdef CONFIG_INIT_STACK_ALL_PATTERN 833KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 834endif 835 836# Initialize all stack variables with a zero value. 837ifdef CONFIG_INIT_STACK_ALL_ZERO 838# Future support for zero initialization is still being debated, see 839# https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being 840# renamed or dropped. 841KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 842KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 843endif 844 845# While VLAs have been removed, GCC produces unreachable stack probes 846# for the randomize_kstack_offset feature. Disable it for all compilers. 847KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) 848 849# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). 850ifdef CONFIG_ZERO_CALL_USED_REGS 851KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr 852endif 853 854DEBUG_CFLAGS := 855 856# Workaround for GCC versions < 5.0 857# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801 858ifdef CONFIG_CC_IS_GCC 859DEBUG_CFLAGS += $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments)) 860endif 861 862ifdef CONFIG_DEBUG_INFO 863 864ifdef CONFIG_DEBUG_INFO_SPLIT 865DEBUG_CFLAGS += -gsplit-dwarf 866else 867DEBUG_CFLAGS += -g 868endif 869 870ifneq ($(LLVM_IAS),1) 871KBUILD_AFLAGS += -Wa,-gdwarf-2 872endif 873 874ifndef CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT 875dwarf-version-$(CONFIG_DEBUG_INFO_DWARF4) := 4 876dwarf-version-$(CONFIG_DEBUG_INFO_DWARF5) := 5 877DEBUG_CFLAGS += -gdwarf-$(dwarf-version-y) 878endif 879 880ifdef CONFIG_DEBUG_INFO_REDUCED 881DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 882 $(call cc-option,-fno-var-tracking) 883endif 884 885ifdef CONFIG_DEBUG_INFO_COMPRESSED 886DEBUG_CFLAGS += -gz=zlib 887KBUILD_AFLAGS += -gz=zlib 888KBUILD_LDFLAGS += --compress-debug-sections=zlib 889endif 890 891endif # CONFIG_DEBUG_INFO 892 893KBUILD_CFLAGS += $(DEBUG_CFLAGS) 894export DEBUG_CFLAGS 895 896ifdef CONFIG_FUNCTION_TRACER 897ifdef CONFIG_FTRACE_MCOUNT_USE_CC 898 CC_FLAGS_FTRACE += -mrecord-mcount 899 ifdef CONFIG_HAVE_NOP_MCOUNT 900 ifeq ($(call cc-option-yn, -mnop-mcount),y) 901 CC_FLAGS_FTRACE += -mnop-mcount 902 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 903 endif 904 endif 905endif 906ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 907 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 908endif 909ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT 910 ifdef CONFIG_HAVE_C_RECORDMCOUNT 911 BUILD_C_RECORDMCOUNT := y 912 export BUILD_C_RECORDMCOUNT 913 endif 914endif 915ifdef CONFIG_HAVE_FENTRY 916 ifeq ($(call cc-option-yn, -mfentry),y) 917 CC_FLAGS_FTRACE += -mfentry 918 CC_FLAGS_USING += -DCC_USING_FENTRY 919 endif 920endif 921export CC_FLAGS_FTRACE 922KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 923KBUILD_AFLAGS += $(CC_FLAGS_USING) 924endif 925 926# We trigger additional mismatches with less inlining 927ifdef CONFIG_DEBUG_SECTION_MISMATCH 928KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 929endif 930 931ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 932KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 933LDFLAGS_vmlinux += --gc-sections 934endif 935 936ifdef CONFIG_SHADOW_CALL_STACK 937CC_FLAGS_SCS := -fsanitize=shadow-call-stack 938KBUILD_CFLAGS += $(CC_FLAGS_SCS) 939export CC_FLAGS_SCS 940endif 941 942ifdef CONFIG_LTO_CLANG 943ifdef CONFIG_LTO_CLANG_THIN 944CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 945KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache 946else 947CC_FLAGS_LTO := -flto 948endif 949CC_FLAGS_LTO += -fvisibility=hidden 950 951# Limit inlining across translation units to reduce binary size 952KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 953 954# Check for frame size exceeding threshold during prolog/epilog insertion 955# when using lld < 13.0.0. 956ifneq ($(CONFIG_FRAME_WARN),0) 957ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0) 958KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) 959endif 960endif 961endif 962 963ifdef CONFIG_LTO 964KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) 965KBUILD_AFLAGS += -fno-lto 966export CC_FLAGS_LTO 967endif 968 969ifdef CONFIG_CFI_CLANG 970CC_FLAGS_CFI := -fsanitize=cfi \ 971 -fsanitize-cfi-cross-dso \ 972 -fno-sanitize-cfi-canonical-jump-tables \ 973 -fno-sanitize-trap=cfi \ 974 -fno-sanitize-blacklist 975 976ifdef CONFIG_CFI_PERMISSIVE 977CC_FLAGS_CFI += -fsanitize-recover=cfi 978endif 979 980# If LTO flags are filtered out, we must also filter out CFI. 981CC_FLAGS_LTO += $(CC_FLAGS_CFI) 982KBUILD_CFLAGS += $(CC_FLAGS_CFI) 983export CC_FLAGS_CFI 984endif 985 986ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B 987KBUILD_CFLAGS += -falign-functions=64 988endif 989 990# arch Makefile may override CC so keep this after arch Makefile is included 991NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 992 993# warn about C99 declaration after statement 994KBUILD_CFLAGS += -Wdeclaration-after-statement 995 996# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 997KBUILD_CFLAGS += -Wvla 998 999# disable pointer signed / unsigned warnings in gcc 4.0 1000KBUILD_CFLAGS += -Wno-pointer-sign 1001 1002# disable stringop warnings in gcc 8+ 1003KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 1004 1005# We'll want to enable this eventually, but it's not going away for 5.7 at least 1006KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 1007KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) 1008KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 1009 1010# Another good warning that we'll want to enable eventually 1011KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 1012 1013# Enabled with W=2, disabled by default as noisy 1014KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized) 1015 1016# disable invalid "can't wrap" optimizations for signed / pointers 1017KBUILD_CFLAGS += -fno-strict-overflow 1018 1019# Make sure -fstack-check isn't enabled (like gentoo apparently did) 1020KBUILD_CFLAGS += -fno-stack-check 1021 1022# conserve stack if available 1023KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 1024 1025# Prohibit date/time macros, which would make the build non-deterministic 1026KBUILD_CFLAGS += -Werror=date-time 1027 1028# enforce correct pointer usage 1029KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 1030 1031# Require designated initializers for all marked structures 1032KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 1033 1034# change __FILE__ to the relative path from the srctree 1035KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 1036 1037# include additional Makefiles when needed 1038include-y := scripts/Makefile.extrawarn 1039include-$(CONFIG_KASAN) += scripts/Makefile.kasan 1040include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 1041include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 1042include-$(CONFIG_KCOV) += scripts/Makefile.kcov 1043include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 1044 1045include $(addprefix $(srctree)/, $(include-y)) 1046 1047# scripts/Makefile.gcc-plugins is intentionally included last. 1048# Do not add $(call cc-option,...) below this line. When you build the kernel 1049# from the clean source tree, the GCC plugins do not exist at this point. 1050 1051# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 1052KBUILD_CPPFLAGS += $(KCPPFLAGS) 1053KBUILD_AFLAGS += $(KAFLAGS) 1054KBUILD_CFLAGS += $(KCFLAGS) 1055 1056KBUILD_LDFLAGS_MODULE += --build-id=sha1 1057LDFLAGS_vmlinux += --build-id=sha1 1058 1059ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 1060LDFLAGS_vmlinux += $(call ld-option, -X,) 1061endif 1062 1063ifeq ($(CONFIG_RELR),y) 1064LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags 1065endif 1066 1067# We never want expected sections to be placed heuristically by the 1068# linker. All sections should be explicitly named in the linker script. 1069ifdef CONFIG_LD_ORPHAN_WARN 1070LDFLAGS_vmlinux += --orphan-handling=warn 1071endif 1072 1073# Align the bit size of userspace programs with the kernel 1074KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1075KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 1076 1077# make the checker run with the right architecture 1078CHECKFLAGS += --arch=$(ARCH) 1079 1080# insure the checker run with the right endianness 1081CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1082 1083# the checker needs the correct machine size 1084CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1085 1086# Default kernel image to build when no specific target is given. 1087# KBUILD_IMAGE may be overruled on the command line or 1088# set in the environment 1089# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1090# this default value 1091export KBUILD_IMAGE ?= vmlinux 1092 1093# 1094# INSTALL_PATH specifies where to place the updated kernel and system map 1095# images. Default is /boot, but you can set it to other values 1096export INSTALL_PATH ?= /boot 1097 1098# 1099# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1100# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1101# an argument if needed. Otherwise it defaults to the kernel install path 1102# 1103export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1104 1105# 1106# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1107# relocations required by build roots. This is not defined in the 1108# makefile but the argument can be passed to make if needed. 1109# 1110 1111MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1112export MODLIB 1113 1114PHONY += prepare0 1115 1116export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 1117export MODORDER := $(extmod_prefix)modules.order 1118export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps 1119 1120ifeq ($(KBUILD_EXTMOD),) 1121core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 1122 1123vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1124 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1125 $(libs-y) $(libs-m))) 1126 1127vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1128 $(patsubst %/,%,$(filter %/, $(core-) \ 1129 $(drivers-) $(libs-)))) 1130 1131subdir-modorder := $(addsuffix modules.order,$(filter %/, \ 1132 $(core-y) $(core-m) $(libs-y) $(libs-m) \ 1133 $(drivers-y) $(drivers-m))) 1134 1135build-dirs := $(vmlinux-dirs) 1136clean-dirs := $(vmlinux-alldirs) 1137 1138# Externally visible symbols (used by link-vmlinux.sh) 1139KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1140KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1141ifdef CONFIG_MODULES 1142KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1143KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1144else 1145KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1146endif 1147KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1148 1149export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1150export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1151# used by scripts/Makefile.package 1152export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1153 1154vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1155 1156# Recurse until adjust_autoksyms.sh is satisfied 1157PHONY += autoksyms_recursive 1158ifdef CONFIG_TRIM_UNUSED_KSYMS 1159# For the kernel to actually contain only the needed exported symbols, 1160# we have to build modules as well to determine what those symbols are. 1161# (this can be evaluated only once include/config/auto.conf has been included) 1162KBUILD_MODULES := 1 1163 1164autoksyms_recursive: descend modules.order 1165 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1166 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1167endif 1168 1169autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1170 1171quiet_cmd_autoksyms_h = GEN $@ 1172 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1173 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1174 1175$(autoksyms_h): 1176 $(call cmd,autoksyms_h) 1177 1178ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1179 1180# Final link of vmlinux with optional arch pass after final link 1181cmd_link-vmlinux = \ 1182 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \ 1183 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1184 1185vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1186 +$(call if_changed_dep,link-vmlinux) 1187 1188targets := vmlinux 1189 1190# The actual objects are generated when descending, 1191# make sure no implicit rule kicks in 1192$(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1193 1194filechk_kernel.release = \ 1195 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1196 1197# Store (new) KERNELRELEASE string in include/config/kernel.release 1198include/config/kernel.release: FORCE 1199 $(call filechk,kernel.release) 1200 1201# Additional helpers built in scripts/ 1202# Carefully list dependencies so we do not try to build scripts twice 1203# in parallel 1204PHONY += scripts 1205scripts: scripts_basic scripts_dtc 1206 $(Q)$(MAKE) $(build)=$(@) 1207 1208# Things we need to do before we recursively start building the kernel 1209# or the modules are listed in "prepare". 1210# A multi level approach is used. prepareN is processed before prepareN-1. 1211# archprepare is used in arch Makefiles and when processed asm symlink, 1212# version.h and scripts_basic is processed / created. 1213 1214PHONY += prepare archprepare 1215 1216archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1217 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1218 include/generated/autoconf.h remove-stale-files 1219 1220prepare0: archprepare 1221 $(Q)$(MAKE) $(build)=scripts/mod 1222 $(Q)$(MAKE) $(build)=. 1223 1224# All the preparing.. 1225prepare: prepare0 1226 1227PHONY += remove-stale-files 1228remove-stale-files: 1229 $(Q)$(srctree)/scripts/remove-stale-files 1230 1231# Support for using generic headers in asm-generic 1232asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1233 1234PHONY += asm-generic uapi-asm-generic 1235asm-generic: uapi-asm-generic 1236 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1237 generic=include/asm-generic 1238uapi-asm-generic: 1239 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1240 generic=include/uapi/asm-generic 1241 1242# Generate some files 1243# --------------------------------------------------------------------------- 1244 1245# KERNELRELEASE can change from a few different places, meaning version.h 1246# needs to be updated, so this check is forced on all builds 1247 1248uts_len := 64 1249define filechk_utsrelease.h 1250 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1251 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1252 exit 1; \ 1253 fi; \ 1254 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1255endef 1256 1257define filechk_version.h 1258 if [ $(SUBLEVEL) -gt 255 ]; then \ 1259 echo \#define LINUX_VERSION_CODE $(shell \ 1260 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ 1261 else \ 1262 echo \#define LINUX_VERSION_CODE $(shell \ 1263 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ 1264 fi; \ 1265 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ 1266 ((c) > 255 ? 255 : (c)))'; \ 1267 echo \#define LINUX_VERSION_MAJOR $(VERSION); \ 1268 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ 1269 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) 1270endef 1271 1272$(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0) 1273$(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0) 1274$(version_h): FORCE 1275 $(call filechk,version.h) 1276 1277include/generated/utsrelease.h: include/config/kernel.release FORCE 1278 $(call filechk,utsrelease.h) 1279 1280PHONY += headerdep 1281headerdep: 1282 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1283 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1284 1285# --------------------------------------------------------------------------- 1286# Kernel headers 1287 1288#Default location for installed headers 1289export INSTALL_HDR_PATH = $(objtree)/usr 1290 1291quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1292 cmd_headers_install = \ 1293 mkdir -p $(INSTALL_HDR_PATH); \ 1294 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1295 usr/include $(INSTALL_HDR_PATH) 1296 1297PHONY += headers_install 1298headers_install: headers 1299 $(call cmd,headers_install) 1300 1301PHONY += archheaders archscripts 1302 1303hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1304 1305PHONY += headers 1306headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1307 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1308 $(error Headers not exportable for the $(SRCARCH) architecture)) 1309 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1310 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1311 1312# Deprecated. It is no-op now. 1313PHONY += headers_check 1314headers_check: 1315 @echo >&2 "=================== WARNING ===================" 1316 @echo >&2 "Since Linux 5.5, 'make headers_check' is no-op," 1317 @echo >&2 "and will be removed after Linux 5.15 release." 1318 @echo >&2 "Please remove headers_check from your scripts." 1319 @echo >&2 "===============================================" 1320 1321ifdef CONFIG_HEADERS_INSTALL 1322prepare: headers 1323endif 1324 1325PHONY += scripts_unifdef 1326scripts_unifdef: scripts_basic 1327 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1328 1329# --------------------------------------------------------------------------- 1330# Install 1331 1332# Many distributions have the custom install script, /sbin/installkernel. 1333# If DKMS is installed, 'make install' will eventually recuses back 1334# to the this Makefile to build and install external modules. 1335# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. 1336 1337install: sub_make_done := 1338 1339# --------------------------------------------------------------------------- 1340# Tools 1341 1342ifdef CONFIG_STACK_VALIDATION 1343prepare: tools/objtool 1344endif 1345 1346ifdef CONFIG_BPF 1347ifdef CONFIG_DEBUG_INFO_BTF 1348prepare: tools/bpf/resolve_btfids 1349endif 1350endif 1351 1352PHONY += resolve_btfids_clean 1353 1354resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids 1355 1356# tools/bpf/resolve_btfids directory might not exist 1357# in output directory, skip its clean in that case 1358resolve_btfids_clean: 1359ifneq ($(wildcard $(resolve_btfids_O)),) 1360 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean 1361endif 1362 1363# Clear a bunch of variables before executing the submake 1364ifeq ($(quiet),silent_) 1365tools_silent=s 1366endif 1367 1368tools/: FORCE 1369 $(Q)mkdir -p $(objtree)/tools 1370 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1371 1372tools/%: FORCE 1373 $(Q)mkdir -p $(objtree)/tools 1374 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1375 1376# --------------------------------------------------------------------------- 1377# Kernel selftest 1378 1379PHONY += kselftest 1380kselftest: 1381 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1382 1383kselftest-%: FORCE 1384 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1385 1386PHONY += kselftest-merge 1387kselftest-merge: 1388 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1389 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1390 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1391 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1392 1393# --------------------------------------------------------------------------- 1394# Devicetree files 1395 1396ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1397dtstree := arch/$(SRCARCH)/boot/dts 1398endif 1399 1400ifneq ($(dtstree),) 1401 1402%.dtb: include/config/kernel.release scripts_dtc 1403 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1404 1405%.dtbo: include/config/kernel.release scripts_dtc 1406 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1407 1408PHONY += dtbs dtbs_install dtbs_check 1409dtbs: include/config/kernel.release scripts_dtc 1410 $(Q)$(MAKE) $(build)=$(dtstree) 1411 1412ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1413export CHECK_DTBS=y 1414dtbs: dt_binding_check 1415endif 1416 1417dtbs_check: dtbs 1418 1419dtbs_install: 1420 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1421 1422ifdef CONFIG_OF_EARLY_FLATTREE 1423all: dtbs 1424endif 1425 1426endif 1427 1428PHONY += scripts_dtc 1429scripts_dtc: scripts_basic 1430 $(Q)$(MAKE) $(build)=scripts/dtc 1431 1432ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1433export CHECK_DT_BINDING=y 1434endif 1435 1436PHONY += dt_binding_check 1437dt_binding_check: scripts_dtc 1438 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1439 1440# --------------------------------------------------------------------------- 1441# Modules 1442 1443ifdef CONFIG_MODULES 1444 1445# By default, build modules as well 1446 1447all: modules 1448 1449# When we're building modules with modversions, we need to consider 1450# the built-in objects during the descend as well, in order to 1451# make sure the checksums are up to date before we record them. 1452ifdef CONFIG_MODVERSIONS 1453 KBUILD_BUILTIN := 1 1454endif 1455 1456# Build modules 1457# 1458# A module can be listed more than once in obj-m resulting in 1459# duplicate lines in modules.order files. Those are removed 1460# using awk while concatenating to the final file. 1461 1462PHONY += modules 1463modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare 1464 1465cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1466 1467modules.order: $(subdir-modorder) FORCE 1468 $(call if_changed,modules_order) 1469 1470targets += modules.order 1471 1472# Target to prepare building external modules 1473PHONY += modules_prepare 1474modules_prepare: prepare 1475 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1476 1477export modules_sign_only := 1478 1479ifeq ($(CONFIG_MODULE_SIG),y) 1480PHONY += modules_sign 1481modules_sign: modules_install 1482 @: 1483 1484# modules_sign is a subset of modules_install. 1485# 'make modules_install modules_sign' is equivalent to 'make modules_install'. 1486ifeq ($(filter modules_install,$(MAKECMDGOALS)),) 1487modules_sign_only := y 1488endif 1489endif 1490 1491modinst_pre := 1492ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 1493modinst_pre := __modinst_pre 1494endif 1495 1496modules_install: $(modinst_pre) 1497PHONY += __modinst_pre 1498__modinst_pre: 1499 @rm -rf $(MODLIB)/kernel 1500 @rm -f $(MODLIB)/source 1501 @mkdir -p $(MODLIB)/kernel 1502 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1503 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1504 rm -f $(MODLIB)/build ; \ 1505 ln -s $(CURDIR) $(MODLIB)/build ; \ 1506 fi 1507 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1508 @cp -f modules.builtin $(MODLIB)/ 1509 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1510 1511endif # CONFIG_MODULES 1512 1513### 1514# Cleaning is done on three levels. 1515# make clean Delete most generated files 1516# Leave enough to build external modules 1517# make mrproper Delete the current configuration, and all generated files 1518# make distclean Remove editor backup files, patch leftover files and the like 1519 1520# Directories & files removed with 'make clean' 1521CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ 1522 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1523 compile_commands.json .thinlto-cache 1524 1525# Directories & files removed with 'make mrproper' 1526MRPROPER_FILES += include/config include/generated \ 1527 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1528 debian snap tar-install \ 1529 .config .config.old .version \ 1530 Module.symvers \ 1531 certs/signing_key.pem certs/signing_key.x509 \ 1532 certs/x509.genkey \ 1533 vmlinux-gdb.py \ 1534 *.spec 1535 1536# clean - Delete most, but leave enough to build external modules 1537# 1538clean: rm-files := $(CLEAN_FILES) 1539 1540PHONY += archclean vmlinuxclean 1541 1542vmlinuxclean: 1543 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1544 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1545 1546clean: archclean vmlinuxclean resolve_btfids_clean 1547 1548# mrproper - Delete all generated files, including .config 1549# 1550mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1551mrproper-dirs := $(addprefix _mrproper_,scripts) 1552 1553PHONY += $(mrproper-dirs) mrproper 1554$(mrproper-dirs): 1555 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1556 1557mrproper: clean $(mrproper-dirs) 1558 $(call cmd,rmfiles) 1559 1560# distclean 1561# 1562PHONY += distclean 1563 1564distclean: mrproper 1565 @find . $(RCS_FIND_IGNORE) \ 1566 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1567 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1568 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ 1569 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ 1570 -type f -print | xargs rm -f 1571 1572 1573# Packaging of the kernel to various formats 1574# --------------------------------------------------------------------------- 1575 1576%src-pkg: FORCE 1577 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1578%pkg: include/config/kernel.release FORCE 1579 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1580 1581# Brief documentation of the typical targets used 1582# --------------------------------------------------------------------------- 1583 1584boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1585boards := $(sort $(notdir $(boards))) 1586board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1587board-dirs := $(sort $(notdir $(board-dirs:/=))) 1588 1589PHONY += help 1590help: 1591 @echo 'Cleaning targets:' 1592 @echo ' clean - Remove most generated files but keep the config and' 1593 @echo ' enough build support to build external modules' 1594 @echo ' mrproper - Remove all generated files + config + various backup files' 1595 @echo ' distclean - mrproper + remove editor backup and patch files' 1596 @echo '' 1597 @echo 'Configuration targets:' 1598 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1599 @echo '' 1600 @echo 'Other generic targets:' 1601 @echo ' all - Build all targets marked with [*]' 1602 @echo '* vmlinux - Build the bare kernel' 1603 @echo '* modules - Build all modules' 1604 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1605 @echo ' dir/ - Build all files in dir and below' 1606 @echo ' dir/file.[ois] - Build specified target only' 1607 @echo ' dir/file.ll - Build the LLVM assembly file' 1608 @echo ' (requires compiler support for LLVM assembly generation)' 1609 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1610 @echo ' (requires a recent binutils and recent build (System.map))' 1611 @echo ' dir/file.ko - Build module including final link' 1612 @echo ' modules_prepare - Set up for building external modules' 1613 @echo ' tags/TAGS - Generate tags file for editors' 1614 @echo ' cscope - Generate cscope index' 1615 @echo ' gtags - Generate GNU GLOBAL index' 1616 @echo ' kernelrelease - Output the release version string (use with make -s)' 1617 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1618 @echo ' image_name - Output the image name (use with make -s)' 1619 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1620 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1621 echo '' 1622 @echo 'Static analysers:' 1623 @echo ' checkstack - Generate a list of stack hogs' 1624 @echo ' versioncheck - Sanity check on version.h usage' 1625 @echo ' includecheck - Check for duplicate included header files' 1626 @echo ' export_report - List the usages of all exported symbols' 1627 @echo ' headerdep - Detect inclusion cycles in headers' 1628 @echo ' coccicheck - Check with Coccinelle' 1629 @echo ' clang-analyzer - Check with clang static analyzer' 1630 @echo ' clang-tidy - Check with clang-tidy' 1631 @echo '' 1632 @echo 'Tools:' 1633 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1634 @echo '' 1635 @echo 'Kernel selftest:' 1636 @echo ' kselftest - Build and run kernel selftest' 1637 @echo ' Build, install, and boot kernel before' 1638 @echo ' running kselftest on it' 1639 @echo ' Run as root for full coverage' 1640 @echo ' kselftest-all - Build kernel selftest' 1641 @echo ' kselftest-install - Build and install kernel selftest' 1642 @echo ' kselftest-clean - Remove all generated kselftest files' 1643 @echo ' kselftest-merge - Merge all the config dependencies of' 1644 @echo ' kselftest to existing .config.' 1645 @echo '' 1646 @$(if $(dtstree), \ 1647 echo 'Devicetree:'; \ 1648 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1649 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1650 echo ' dt_binding_check - Validate device tree binding documents'; \ 1651 echo ' dtbs_check - Validate device tree source files';\ 1652 echo '') 1653 1654 @echo 'Userspace tools targets:' 1655 @echo ' use "make tools/help"' 1656 @echo ' or "cd tools; make help"' 1657 @echo '' 1658 @echo 'Kernel packaging:' 1659 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1660 @echo '' 1661 @echo 'Documentation targets:' 1662 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1663 @echo '' 1664 @echo 'Architecture specific targets ($(SRCARCH)):' 1665 @$(if $(archhelp),$(archhelp),\ 1666 echo ' No architecture specific help defined for $(SRCARCH)') 1667 @echo '' 1668 @$(if $(boards), \ 1669 $(foreach b, $(boards), \ 1670 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1671 echo '') 1672 @$(if $(board-dirs), \ 1673 $(foreach b, $(board-dirs), \ 1674 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1675 printf " %-16s - Show all of the above\\n" help-boards; \ 1676 echo '') 1677 1678 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1679 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1680 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1681 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1682 @echo ' (sparse by default)' 1683 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1684 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1685 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1686 @echo ' 1: warnings which may be relevant and do not occur too often' 1687 @echo ' 2: warnings which occur quite often but may still be relevant' 1688 @echo ' 3: more obscure warnings, can most likely be ignored' 1689 @echo ' Multiple levels can be combined with W=12 or W=123' 1690 @echo '' 1691 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1692 @echo 'For further info see the ./README file' 1693 1694 1695help-board-dirs := $(addprefix help-,$(board-dirs)) 1696 1697help-boards: $(help-board-dirs) 1698 1699boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1700 1701$(help-board-dirs): help-%: 1702 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1703 @$(if $(boards-per-dir), \ 1704 $(foreach b, $(boards-per-dir), \ 1705 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1706 echo '') 1707 1708 1709# Documentation targets 1710# --------------------------------------------------------------------------- 1711DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1712 linkcheckdocs dochelp refcheckdocs 1713PHONY += $(DOC_TARGETS) 1714$(DOC_TARGETS): 1715 $(Q)$(MAKE) $(build)=Documentation $@ 1716 1717# Misc 1718# --------------------------------------------------------------------------- 1719 1720PHONY += scripts_gdb 1721scripts_gdb: prepare0 1722 $(Q)$(MAKE) $(build)=scripts/gdb 1723 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1724 1725ifdef CONFIG_GDB_SCRIPTS 1726all: scripts_gdb 1727endif 1728 1729else # KBUILD_EXTMOD 1730 1731### 1732# External module support. 1733# When building external modules the kernel used as basis is considered 1734# read-only, and no consistency checks are made and the make 1735# system is not used on the basis kernel. If updates are required 1736# in the basis kernel ordinary make commands (without M=...) must be used. 1737 1738# We are always building only modules. 1739KBUILD_BUILTIN := 1740KBUILD_MODULES := 1 1741 1742build-dirs := $(KBUILD_EXTMOD) 1743$(MODORDER): descend 1744 @: 1745 1746compile_commands.json: $(extmod_prefix)compile_commands.json 1747PHONY += compile_commands.json 1748 1749clean-dirs := $(KBUILD_EXTMOD) 1750clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1751 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache 1752 1753PHONY += help 1754help: 1755 @echo ' Building external modules.' 1756 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1757 @echo '' 1758 @echo ' modules - default target, build the module(s)' 1759 @echo ' modules_install - install the module' 1760 @echo ' clean - remove generated files in module directory only' 1761 @echo '' 1762 1763# no-op for external module builds 1764PHONY += prepare modules_prepare 1765 1766endif # KBUILD_EXTMOD 1767 1768# --------------------------------------------------------------------------- 1769# Modules 1770 1771PHONY += modules modules_install 1772 1773ifdef CONFIG_MODULES 1774 1775modules: modules_check 1776 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1777 1778PHONY += modules_check 1779modules_check: $(MODORDER) 1780 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1781 1782quiet_cmd_depmod = DEPMOD $(MODLIB) 1783 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1784 $(KERNELRELEASE) 1785 1786modules_install: 1787 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1788 $(call cmd,depmod) 1789 1790else # CONFIG_MODULES 1791 1792# Modules not configured 1793# --------------------------------------------------------------------------- 1794 1795modules modules_install: 1796 @echo >&2 '***' 1797 @echo >&2 '*** The present kernel configuration has modules disabled.' 1798 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.' 1799 @echo >&2 '*** to enable CONFIG_MODULES.' 1800 @echo >&2 '***' 1801 @exit 1 1802 1803endif # CONFIG_MODULES 1804 1805# Single targets 1806# --------------------------------------------------------------------------- 1807# To build individual files in subdirectories, you can do like this: 1808# 1809# make foo/bar/baz.s 1810# 1811# The supported suffixes for single-target are listed in 'single-targets' 1812# 1813# To build only under specific subdirectories, you can do like this: 1814# 1815# make foo/bar/baz/ 1816 1817ifdef single-build 1818 1819# .ko is special because modpost is needed 1820single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1821single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1822 1823$(single-ko): single_modpost 1824 @: 1825$(single-no-ko): descend 1826 @: 1827 1828ifeq ($(KBUILD_EXTMOD),) 1829# For the single build of in-tree modules, use a temporary file to avoid 1830# the situation of modules_install installing an invalid modules.order. 1831MODORDER := .modules.tmp 1832endif 1833 1834PHONY += single_modpost 1835single_modpost: $(single-no-ko) modules_prepare 1836 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER) 1837 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1838 1839KBUILD_MODULES := 1 1840 1841export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod_prefix), $(single-no-ko)) 1842 1843# trim unrelated directories 1844build-dirs := $(foreach d, $(build-dirs), \ 1845 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1846 1847endif 1848 1849ifndef CONFIG_MODULES 1850KBUILD_MODULES := 1851endif 1852 1853# Handle descending into subdirectories listed in $(build-dirs) 1854# Preset locale variables to speed up the build process. Limit locale 1855# tweaks to this spot to avoid wrong language settings when running 1856# make menuconfig etc. 1857# Error messages still appears in the original language 1858PHONY += descend $(build-dirs) 1859descend: $(build-dirs) 1860$(build-dirs): prepare 1861 $(Q)$(MAKE) $(build)=$@ \ 1862 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ 1863 need-builtin=1 need-modorder=1 1864 1865clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1866PHONY += $(clean-dirs) clean 1867$(clean-dirs): 1868 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1869 1870clean: $(clean-dirs) 1871 $(call cmd,rmfiles) 1872 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1873 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1874 -o -name '*.ko.*' \ 1875 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1876 -o -name '*.dwo' -o -name '*.lst' \ 1877 -o -name '*.su' -o -name '*.mod' \ 1878 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1879 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1880 -o -name '*.asn1.[ch]' \ 1881 -o -name '*.symtypes' -o -name 'modules.order' \ 1882 -o -name '.tmp_*.o.*' \ 1883 -o -name '*.c.[012]*.*' \ 1884 -o -name '*.ll' \ 1885 -o -name '*.gcno' \ 1886 -o -name '*.*.symversions' \) -type f -print | xargs rm -f 1887 1888# Generate tags for editors 1889# --------------------------------------------------------------------------- 1890quiet_cmd_tags = GEN $@ 1891 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1892 1893tags TAGS cscope gtags: FORCE 1894 $(call cmd,tags) 1895 1896# Script to generate missing namespace dependencies 1897# --------------------------------------------------------------------------- 1898 1899PHONY += nsdeps 1900nsdeps: export KBUILD_NSDEPS=1 1901nsdeps: modules 1902 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1903 1904# Clang Tooling 1905# --------------------------------------------------------------------------- 1906 1907quiet_cmd_gen_compile_commands = GEN $@ 1908 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1909 1910$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1911 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \ 1912 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1913 $(call if_changed,gen_compile_commands) 1914 1915targets += $(extmod_prefix)compile_commands.json 1916 1917PHONY += clang-tidy clang-analyzer 1918 1919ifdef CONFIG_CC_IS_CLANG 1920quiet_cmd_clang_tools = CHECK $< 1921 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1922 1923clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json 1924 $(call cmd,clang_tools) 1925else 1926clang-tidy clang-analyzer: 1927 @echo "$@ requires CC=clang" >&2 1928 @false 1929endif 1930 1931# Scripts to check various things for consistency 1932# --------------------------------------------------------------------------- 1933 1934PHONY += includecheck versioncheck coccicheck export_report 1935 1936includecheck: 1937 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1938 -name '*.[hcS]' -type f -print | sort \ 1939 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1940 1941versioncheck: 1942 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1943 -name '*.[hcS]' -type f -print | sort \ 1944 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1945 1946coccicheck: 1947 $(Q)$(BASH) $(srctree)/scripts/$@ 1948 1949export_report: 1950 $(PERL) $(srctree)/scripts/export_report.pl 1951 1952PHONY += checkstack kernelrelease kernelversion image_name 1953 1954# UML needs a little special treatment here. It wants to use the host 1955# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1956# else wants $(ARCH), including people doing cross-builds, which means 1957# that $(SUBARCH) doesn't work here. 1958ifeq ($(ARCH), um) 1959CHECKSTACK_ARCH := $(SUBARCH) 1960else 1961CHECKSTACK_ARCH := $(ARCH) 1962endif 1963checkstack: 1964 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1965 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1966 1967kernelrelease: 1968 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1969 1970kernelversion: 1971 @echo $(KERNELVERSION) 1972 1973image_name: 1974 @echo $(KBUILD_IMAGE) 1975 1976quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1977 cmd_rmfiles = rm -rf $(rm-files) 1978 1979# read saved command lines for existing targets 1980existing-targets := $(wildcard $(sort $(targets))) 1981 1982-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1983 1984endif # config-build 1985endif # mixed-build 1986endif # need-sub-make 1987 1988PHONY += FORCE 1989FORCE: 1990 1991# Declare the contents of the PHONY variable as phony. We keep that 1992# information in a variable so we can use it in if_changed and friends. 1993.PHONY: $(PHONY) 1994