1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 10 4SUBLEVEL = 0 5EXTRAVERSION = 6NAME = Kleptomaniac Octopus 7 8# *DOCUMENTATION* 9# To see a list of typical targets execute "make help" 10# More info can be located in ./README 11# Comments in this file are targeted only to the developer, do not 12# expect to learn how to build the kernel reading this file. 13 14$(if $(filter __%, $(MAKECMDGOALS)), \ 15 $(error targets prefixed with '__' are only for internal use)) 16 17# That's our default target when none is given on the command line 18PHONY := __all 19__all: 20 21# We are using a recursive build, so we need to do a little thinking 22# to get the ordering right. 23# 24# Most importantly: sub-Makefiles should only ever modify files in 25# their own directory. If in some directory we have a dependency on 26# a file in another dir (which doesn't happen often, but it's often 27# unavoidable when linking the built-in.a targets which finally 28# turn into vmlinux), we will call a sub make in that other dir, and 29# after that we are sure that everything which is in that other dir 30# is now up to date. 31# 32# The only cases where we need to modify files which have global 33# effects are thus separated out and done before the recursive 34# descending is started. They are now explicitly listed as the 35# prepare rule. 36 37ifneq ($(sub_make_done),1) 38 39# Do not use make's built-in rules and variables 40# (this increases performance and avoids hard-to-debug behaviour) 41MAKEFLAGS += -rR 42 43# Avoid funny character set dependencies 44unexport LC_ALL 45LC_COLLATE=C 46LC_NUMERIC=C 47export LC_COLLATE LC_NUMERIC 48 49# Avoid interference with shell env settings 50unexport GREP_OPTIONS 51 52# Beautify output 53# --------------------------------------------------------------------------- 54# 55# Normally, we echo the whole command before executing it. By making 56# that echo $($(quiet)$(cmd)), we now have the possibility to set 57# $(quiet) to choose other forms of output instead, e.g. 58# 59# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 60# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 61# 62# If $(quiet) is empty, the whole command will be printed. 63# If it is set to "quiet_", only the short version will be printed. 64# If it is set to "silent_", nothing will be printed at all, since 65# the variable $(silent_cmd_cc_o_c) doesn't exist. 66# 67# A simple variant is to prefix commands with $(Q) - that's useful 68# for commands that shall be hidden in non-verbose mode. 69# 70# $(Q)ln $@ :< 71# 72# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 73# If KBUILD_VERBOSE equals 1 then the above command is displayed. 74# If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt. 75# 76# To put more focus on warnings, be less verbose as default 77# Use 'make V=1' to see the full commands 78 79ifeq ("$(origin V)", "command line") 80 KBUILD_VERBOSE = $(V) 81endif 82ifndef KBUILD_VERBOSE 83 KBUILD_VERBOSE = 0 84endif 85 86ifeq ($(KBUILD_VERBOSE),1) 87 quiet = 88 Q = 89else 90 quiet=quiet_ 91 Q = @ 92endif 93 94# If the user is running make -s (silent mode), suppress echoing of 95# commands 96 97ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 98 quiet=silent_ 99endif 100 101export quiet Q KBUILD_VERBOSE 102 103# Kbuild will save output files in the current working directory. 104# This does not need to match to the root of the kernel source tree. 105# 106# For example, you can do this: 107# 108# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile 109# 110# If you want to save output files in a different location, there are 111# two syntaxes to specify it. 112# 113# 1) O= 114# Use "make O=dir/to/store/output/files/" 115# 116# 2) Set KBUILD_OUTPUT 117# Set the environment variable KBUILD_OUTPUT to point to the output directory. 118# export KBUILD_OUTPUT=dir/to/store/output/files/; make 119# 120# The O= assignment takes precedence over the KBUILD_OUTPUT environment 121# variable. 122 123# Do we want to change the working directory? 124ifeq ("$(origin O)", "command line") 125 KBUILD_OUTPUT := $(O) 126endif 127 128ifneq ($(KBUILD_OUTPUT),) 129# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot 130# expand a shell special character '~'. We use a somewhat tedious way here. 131abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) 132$(if $(abs_objtree),, \ 133 $(error failed to create output directory "$(KBUILD_OUTPUT)")) 134 135# $(realpath ...) resolves symlinks 136abs_objtree := $(realpath $(abs_objtree)) 137else 138abs_objtree := $(CURDIR) 139endif # ifneq ($(KBUILD_OUTPUT),) 140 141ifeq ($(abs_objtree),$(CURDIR)) 142# Suppress "Entering directory ..." unless we are changing the work directory. 143MAKEFLAGS += --no-print-directory 144else 145need-sub-make := 1 146endif 147 148abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST)))) 149 150ifneq ($(words $(subst :, ,$(abs_srctree))), 1) 151$(error source directory cannot contain spaces or colons) 152endif 153 154ifneq ($(abs_srctree),$(abs_objtree)) 155# Look for make include files relative to root of kernel src 156# 157# This does not become effective immediately because MAKEFLAGS is re-parsed 158# once after the Makefile is read. We need to invoke sub-make. 159MAKEFLAGS += --include-dir=$(abs_srctree) 160need-sub-make := 1 161endif 162 163this-makefile := $(lastword $(MAKEFILE_LIST)) 164 165ifneq ($(filter 3.%,$(MAKE_VERSION)),) 166# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x 167# We need to invoke sub-make to avoid implicit rules in the top Makefile. 168need-sub-make := 1 169# Cancel implicit rules for this Makefile. 170$(this-makefile): ; 171endif 172 173export abs_srctree abs_objtree 174export sub_make_done := 1 175 176ifeq ($(need-sub-make),1) 177 178PHONY += $(MAKECMDGOALS) __sub-make 179 180$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make 181 @: 182 183# Invoke a second make in the output directory, passing relevant variables 184__sub-make: 185 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) 186 187endif # need-sub-make 188endif # sub_make_done 189 190# We process the rest of the Makefile if this is the final invocation of make 191ifeq ($(need-sub-make),) 192 193# Do not print "Entering directory ...", 194# but we want to display it when entering to the output directory 195# so that IDEs/editors are able to understand relative filenames. 196MAKEFLAGS += --no-print-directory 197 198# Call a source code checker (by default, "sparse") as part of the 199# C compilation. 200# 201# Use 'make C=1' to enable checking of only re-compiled files. 202# Use 'make C=2' to enable checking of *all* source files, regardless 203# of whether they are re-compiled or not. 204# 205# See the file "Documentation/dev-tools/sparse.rst" for more details, 206# including where to get the "sparse" utility. 207 208ifeq ("$(origin C)", "command line") 209 KBUILD_CHECKSRC = $(C) 210endif 211ifndef KBUILD_CHECKSRC 212 KBUILD_CHECKSRC = 0 213endif 214 215# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the 216# directory of external module to build. Setting M= takes precedence. 217ifeq ("$(origin M)", "command line") 218 KBUILD_EXTMOD := $(M) 219endif 220 221$(if $(word 2, $(KBUILD_EXTMOD)), \ 222 $(error building multiple external modules is not supported)) 223 224export KBUILD_CHECKSRC KBUILD_EXTMOD 225 226extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) 227 228ifeq ($(abs_srctree),$(abs_objtree)) 229 # building in the source tree 230 srctree := . 231 building_out_of_srctree := 232else 233 ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) 234 # building in a subdirectory of the source tree 235 srctree := .. 236 else 237 srctree := $(abs_srctree) 238 endif 239 building_out_of_srctree := 1 240endif 241 242ifneq ($(KBUILD_ABS_SRCTREE),) 243srctree := $(abs_srctree) 244endif 245 246objtree := . 247VPATH := $(srctree) 248 249export building_out_of_srctree srctree objtree VPATH 250 251# To make sure we do not include .config for any of the *config targets 252# catch them early, and hand them over to scripts/kconfig/Makefile 253# It is allowed to specify more targets when calling make, including 254# mixing *config targets and build targets. 255# For example 'make oldconfig all'. 256# Detect when mixed targets is specified, and make a second invocation 257# of make so .config is not included in this case either (for *config). 258 259version_h := include/generated/uapi/linux/version.h 260old_version_h := include/linux/version.h 261 262clean-targets := %clean mrproper cleandocs 263no-dot-config-targets := $(clean-targets) \ 264 cscope gtags TAGS tags help% %docs check% coccicheck \ 265 $(version_h) headers headers_% archheaders archscripts \ 266 %asm-generic kernelversion %src-pkg dt_binding_check \ 267 outputmakefile 268no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease 269single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ 270 271config-build := 272mixed-build := 273need-config := 1 274may-sync-config := 1 275single-build := 276 277ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 278 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 279 need-config := 280 endif 281endif 282 283ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 284 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 285 may-sync-config := 286 endif 287endif 288 289ifneq ($(KBUILD_EXTMOD),) 290 may-sync-config := 291endif 292 293ifeq ($(KBUILD_EXTMOD),) 294 ifneq ($(filter %config,$(MAKECMDGOALS)),) 295 config-build := 1 296 ifneq ($(words $(MAKECMDGOALS)),1) 297 mixed-build := 1 298 endif 299 endif 300endif 301 302# We cannot build single targets and the others at the same time 303ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) 304 single-build := 1 305 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) 306 mixed-build := 1 307 endif 308endif 309 310# For "make -j clean all", "make -j mrproper defconfig all", etc. 311ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 312 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 313 mixed-build := 1 314 endif 315endif 316 317# install and modules_install need also be processed one by one 318ifneq ($(filter install,$(MAKECMDGOALS)),) 319 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 320 mixed-build := 1 321 endif 322endif 323 324ifdef mixed-build 325# =========================================================================== 326# We're called with mixed targets (*config and build targets). 327# Handle them one by one. 328 329PHONY += $(MAKECMDGOALS) __build_one_by_one 330 331$(MAKECMDGOALS): __build_one_by_one 332 @: 333 334__build_one_by_one: 335 $(Q)set -e; \ 336 for i in $(MAKECMDGOALS); do \ 337 $(MAKE) -f $(srctree)/Makefile $$i; \ 338 done 339 340else # !mixed-build 341 342include scripts/Kbuild.include 343 344# Read KERNELRELEASE from include/config/kernel.release (if it exists) 345KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 346KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 347export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 348 349include scripts/subarch.include 350 351# Cross compiling and selecting different set of gcc/bin-utils 352# --------------------------------------------------------------------------- 353# 354# When performing cross compilation for other architectures ARCH shall be set 355# to the target architecture. (See arch/* for the possibilities). 356# ARCH can be set during invocation of make: 357# make ARCH=ia64 358# Another way is to have ARCH set in the environment. 359# The default ARCH is the host where make is executed. 360 361# CROSS_COMPILE specify the prefix used for all executables used 362# during compilation. Only gcc and related bin-utils executables 363# are prefixed with $(CROSS_COMPILE). 364# CROSS_COMPILE can be set on the command line 365# make CROSS_COMPILE=ia64-linux- 366# Alternatively CROSS_COMPILE can be set in the environment. 367# Default value for CROSS_COMPILE is not to prefix executables 368# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 369ARCH ?= $(SUBARCH) 370 371# Architecture as present in compile.h 372UTS_MACHINE := $(ARCH) 373SRCARCH := $(ARCH) 374 375# Additional ARCH settings for x86 376ifeq ($(ARCH),i386) 377 SRCARCH := x86 378endif 379ifeq ($(ARCH),x86_64) 380 SRCARCH := x86 381endif 382 383# Additional ARCH settings for sparc 384ifeq ($(ARCH),sparc32) 385 SRCARCH := sparc 386endif 387ifeq ($(ARCH),sparc64) 388 SRCARCH := sparc 389endif 390 391# Additional ARCH settings for sh 392ifeq ($(ARCH),sh64) 393 SRCARCH := sh 394endif 395 396KCONFIG_CONFIG ?= .config 397export KCONFIG_CONFIG 398 399# Default file for 'make defconfig'. This may be overridden by arch-Makefile. 400export KBUILD_DEFCONFIG := defconfig 401 402# SHELL used by kbuild 403CONFIG_SHELL := sh 404 405HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 406HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 407HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 408 409ifneq ($(LLVM),) 410HOSTCC = clang 411HOSTCXX = clang++ 412else 413HOSTCC = gcc 414HOSTCXX = g++ 415endif 416 417export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ 418 -O2 -fomit-frame-pointer -std=gnu89 419export KBUILD_USERLDFLAGS := 420 421KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) 422KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 423KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 424KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 425 426# Make variables (CC, etc...) 427CPP = $(CC) -E 428ifneq ($(LLVM),) 429CC = clang 430LD = ld.lld 431AR = llvm-ar 432NM = llvm-nm 433OBJCOPY = llvm-objcopy 434OBJDUMP = llvm-objdump 435READELF = llvm-readelf 436STRIP = llvm-strip 437else 438CC = $(CROSS_COMPILE)gcc 439LD = $(CROSS_COMPILE)ld 440AR = $(CROSS_COMPILE)ar 441NM = $(CROSS_COMPILE)nm 442OBJCOPY = $(CROSS_COMPILE)objcopy 443OBJDUMP = $(CROSS_COMPILE)objdump 444READELF = $(CROSS_COMPILE)readelf 445STRIP = $(CROSS_COMPILE)strip 446endif 447PAHOLE = pahole 448RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids 449LEX = flex 450YACC = bison 451AWK = awk 452INSTALLKERNEL := installkernel 453DEPMOD = /sbin/depmod 454PERL = perl 455PYTHON = python 456PYTHON3 = python3 457CHECK = sparse 458BASH = bash 459KGZIP = gzip 460KBZIP2 = bzip2 461KLZOP = lzop 462LZMA = lzma 463LZ4 = lz4c 464XZ = xz 465ZSTD = zstd 466 467CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 468 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 469NOSTDINC_FLAGS := 470CFLAGS_MODULE = 471AFLAGS_MODULE = 472LDFLAGS_MODULE = 473CFLAGS_KERNEL = 474AFLAGS_KERNEL = 475LDFLAGS_vmlinux = 476 477# Use USERINCLUDE when you must reference the UAPI directories only. 478USERINCLUDE := \ 479 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 480 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 481 -I$(srctree)/include/uapi \ 482 -I$(objtree)/include/generated/uapi \ 483 -include $(srctree)/include/linux/kconfig.h 484 485# Use LINUXINCLUDE when you must reference the include/ directory. 486# Needed to be compatible with the O= option 487LINUXINCLUDE := \ 488 -I$(srctree)/arch/$(SRCARCH)/include \ 489 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 490 $(if $(building_out_of_srctree),-I$(srctree)/include) \ 491 -I$(objtree)/include \ 492 $(USERINCLUDE) 493 494KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 495KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 496 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 497 -Werror=implicit-function-declaration -Werror=implicit-int \ 498 -Werror=return-type -Wno-format-security \ 499 -std=gnu89 500KBUILD_CPPFLAGS := -D__KERNEL__ 501KBUILD_AFLAGS_KERNEL := 502KBUILD_CFLAGS_KERNEL := 503KBUILD_AFLAGS_MODULE := -DMODULE 504KBUILD_CFLAGS_MODULE := -DMODULE 505KBUILD_LDFLAGS_MODULE := 506KBUILD_LDFLAGS := 507CLANG_FLAGS := 508 509export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC 510export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL 511export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX 512export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD 513export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE 514 515export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 516export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 517export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 518export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 519export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 520 521# Files to ignore in find ... statements 522 523export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 524 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 525 -prune -o 526export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 527 --exclude CVS --exclude .pc --exclude .hg --exclude .git 528 529# =========================================================================== 530# Rules shared between *config targets and build targets 531 532# Basic helpers built in scripts/basic/ 533PHONY += scripts_basic 534scripts_basic: 535 $(Q)$(MAKE) $(build)=scripts/basic 536 $(Q)rm -f .tmp_quiet_recordmcount 537 538PHONY += outputmakefile 539# Before starting out-of-tree build, make sure the source tree is clean. 540# outputmakefile generates a Makefile in the output directory, if using a 541# separate output directory. This allows convenient use of make in the 542# output directory. 543# At the same time when output Makefile generated, generate .gitignore to 544# ignore whole output directory 545outputmakefile: 546ifdef building_out_of_srctree 547 $(Q)if [ -f $(srctree)/.config -o \ 548 -d $(srctree)/include/config -o \ 549 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ 550 echo >&2 "***"; \ 551 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ 552 echo >&2 "*** in $(abs_srctree)";\ 553 echo >&2 "***"; \ 554 false; \ 555 fi 556 $(Q)ln -fsn $(srctree) source 557 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 558 $(Q)test -e .gitignore || \ 559 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore 560endif 561 562ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),) 563ifneq ($(CROSS_COMPILE),) 564CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) 565GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) 566CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE)) 567GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) 568endif 569ifneq ($(GCC_TOOLCHAIN),) 570CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) 571endif 572ifneq ($(LLVM_IAS),1) 573CLANG_FLAGS += -no-integrated-as 574endif 575CLANG_FLAGS += -Werror=unknown-warning-option 576KBUILD_CFLAGS += $(CLANG_FLAGS) 577KBUILD_AFLAGS += $(CLANG_FLAGS) 578export CLANG_FLAGS 579endif 580 581# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 582# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 583# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 584# and from include/config/auto.conf.cmd to detect the compiler upgrade. 585CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1) 586 587ifdef config-build 588# =========================================================================== 589# *config targets only - make sure prerequisites are updated, and descend 590# in scripts/kconfig to make the *config target 591 592# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 593# KBUILD_DEFCONFIG may point out an alternative default configuration 594# used for 'make defconfig' 595include arch/$(SRCARCH)/Makefile 596export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 597 598config: outputmakefile scripts_basic FORCE 599 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 600 601%config: outputmakefile scripts_basic FORCE 602 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 603 604else #!config-build 605# =========================================================================== 606# Build targets only - this includes vmlinux, arch specific targets, clean 607# targets and others. In general all targets except *config targets. 608 609# If building an external module we do not care about the all: rule 610# but instead __all depend on modules 611PHONY += all 612ifeq ($(KBUILD_EXTMOD),) 613__all: all 614else 615__all: modules 616endif 617 618# Decide whether to build built-in, modular, or both. 619# Normally, just do built-in. 620 621KBUILD_MODULES := 622KBUILD_BUILTIN := 1 623 624# If we have only "make modules", don't compile built-in objects. 625ifeq ($(MAKECMDGOALS),modules) 626 KBUILD_BUILTIN := 627endif 628 629# If we have "make <whatever> modules", compile modules 630# in addition to whatever we do anyway. 631# Just "make" or "make all" shall build modules as well 632 633ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) 634 KBUILD_MODULES := 1 635endif 636 637ifeq ($(MAKECMDGOALS),) 638 KBUILD_MODULES := 1 639endif 640 641export KBUILD_MODULES KBUILD_BUILTIN 642 643ifdef need-config 644include include/config/auto.conf 645endif 646 647ifeq ($(KBUILD_EXTMOD),) 648# Objects we will link into vmlinux / subdirs we need to visit 649core-y := init/ usr/ 650drivers-y := drivers/ sound/ 651drivers-$(CONFIG_SAMPLES) += samples/ 652drivers-y += net/ virt/ 653libs-y := lib/ 654endif # KBUILD_EXTMOD 655 656# The all: target is the default when no target is given on the 657# command line. 658# This allow a user to issue only 'make' to build a kernel including modules 659# Defaults to vmlinux, but the arch makefile usually adds further targets 660all: vmlinux 661 662CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 663 $(call cc-option,-fno-tree-loop-im) \ 664 $(call cc-disable-warning,maybe-uninitialized,) 665export CFLAGS_GCOV 666 667# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 668ifdef CONFIG_FUNCTION_TRACER 669 CC_FLAGS_FTRACE := -pg 670endif 671 672RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 673RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 674RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 675RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 676RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 677RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 678export RETPOLINE_CFLAGS 679export RETPOLINE_VDSO_CFLAGS 680 681include arch/$(SRCARCH)/Makefile 682 683ifdef need-config 684ifdef may-sync-config 685# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 686# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 687# because some architectures define CROSS_COMPILE there. 688include include/config/auto.conf.cmd 689 690$(KCONFIG_CONFIG): 691 @echo >&2 '***' 692 @echo >&2 '*** Configuration file "$@" not found!' 693 @echo >&2 '***' 694 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' 695 @echo >&2 '*** "make menuconfig" or "make xconfig").' 696 @echo >&2 '***' 697 @/bin/false 698 699# The actual configuration files used during the build are stored in 700# include/generated/ and include/config/. Update them if .config is newer than 701# include/config/auto.conf (which mirrors .config). 702# 703# This exploits the 'multi-target pattern rule' trick. 704# The syncconfig should be executed only once to make all the targets. 705# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) 706quiet_cmd_syncconfig = SYNC $@ 707 cmd_syncconfig = $(MAKE) -f $(srctree)/Makefile syncconfig 708 709%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG) 710 +$(call cmd,syncconfig) 711else # !may-sync-config 712# External modules and some install targets need include/generated/autoconf.h 713# and include/config/auto.conf but do not care if they are up-to-date. 714# Use auto.conf to trigger the test 715PHONY += include/config/auto.conf 716 717include/config/auto.conf: 718 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 719 echo >&2; \ 720 echo >&2 " ERROR: Kernel configuration is invalid."; \ 721 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 722 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 723 echo >&2 ; \ 724 /bin/false) 725 726endif # may-sync-config 727endif # need-config 728 729KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 730KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 731KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 732KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 733KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 734 735ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE 736KBUILD_CFLAGS += -O2 737else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 738KBUILD_CFLAGS += -O3 739else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 740KBUILD_CFLAGS += -Os 741endif 742 743# Tell gcc to never replace conditional load with a non-conditional one 744KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 745KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) 746 747ifdef CONFIG_READABLE_ASM 748# Disable optimizations that make assembler listings hard to read. 749# reorder blocks reorders the control in the function 750# ipa clone creates specialized cloned functions 751# partial inlining inlines only parts of functions 752KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 753 $(call cc-option,-fno-ipa-cp-clone,) \ 754 $(call cc-option,-fno-partial-inlining) 755endif 756 757ifneq ($(CONFIG_FRAME_WARN),0) 758KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) 759endif 760 761stackp-flags-y := -fno-stack-protector 762stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 763stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 764 765KBUILD_CFLAGS += $(stackp-flags-y) 766 767ifdef CONFIG_CC_IS_CLANG 768KBUILD_CPPFLAGS += -Qunused-arguments 769KBUILD_CFLAGS += -Wno-format-invalid-specifier 770KBUILD_CFLAGS += -Wno-gnu 771# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 772# source of a reference will be _MergedGlobals and not on of the whitelisted names. 773# See modpost pattern 2 774KBUILD_CFLAGS += -mno-global-merge 775else 776 777# These warnings generated too much noise in a regular build. 778# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 779KBUILD_CFLAGS += -Wno-unused-but-set-variable 780 781# Warn about unmarked fall-throughs in switch statement. 782# Disabled for clang while comment to attribute conversion happens and 783# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed. 784KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,) 785endif 786 787KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 788ifdef CONFIG_FRAME_POINTER 789KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 790else 791# Some targets (ARM with Thumb2, for example), can't be built with frame 792# pointers. For those, we don't have FUNCTION_TRACER automatically 793# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 794# incompatible with -fomit-frame-pointer with current GCC, so we don't use 795# -fomit-frame-pointer with FUNCTION_TRACER. 796ifndef CONFIG_FUNCTION_TRACER 797KBUILD_CFLAGS += -fomit-frame-pointer 798endif 799endif 800 801# Initialize all stack variables with a 0xAA pattern. 802ifdef CONFIG_INIT_STACK_ALL_PATTERN 803KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern 804endif 805 806# Initialize all stack variables with a zero value. 807ifdef CONFIG_INIT_STACK_ALL_ZERO 808# Future support for zero initialization is still being debated, see 809# https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being 810# renamed or dropped. 811KBUILD_CFLAGS += -ftrivial-auto-var-init=zero 812KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang 813endif 814 815# Workaround for GCC versions < 5.0 816# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801 817ifdef CONFIG_CC_IS_GCC 818DEBUG_CFLAGS := $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments)) 819endif 820 821ifdef CONFIG_DEBUG_INFO 822 823ifdef CONFIG_DEBUG_INFO_SPLIT 824DEBUG_CFLAGS += -gsplit-dwarf 825else 826DEBUG_CFLAGS += -g 827endif 828 829ifneq ($(LLVM_IAS),1) 830KBUILD_AFLAGS += -Wa,-gdwarf-2 831endif 832 833ifdef CONFIG_DEBUG_INFO_DWARF4 834DEBUG_CFLAGS += -gdwarf-4 835endif 836 837ifdef CONFIG_DEBUG_INFO_REDUCED 838DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 839 $(call cc-option,-fno-var-tracking) 840endif 841 842ifdef CONFIG_DEBUG_INFO_COMPRESSED 843DEBUG_CFLAGS += -gz=zlib 844KBUILD_AFLAGS += -gz=zlib 845KBUILD_LDFLAGS += --compress-debug-sections=zlib 846endif 847 848endif # CONFIG_DEBUG_INFO 849 850KBUILD_CFLAGS += $(DEBUG_CFLAGS) 851export DEBUG_CFLAGS 852 853ifdef CONFIG_FUNCTION_TRACER 854ifdef CONFIG_FTRACE_MCOUNT_RECORD 855 # gcc 5 supports generating the mcount tables directly 856 ifeq ($(call cc-option-yn,-mrecord-mcount),y) 857 CC_FLAGS_FTRACE += -mrecord-mcount 858 export CC_USING_RECORD_MCOUNT := 1 859 endif 860 ifdef CONFIG_HAVE_NOP_MCOUNT 861 ifeq ($(call cc-option-yn, -mnop-mcount),y) 862 CC_FLAGS_FTRACE += -mnop-mcount 863 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 864 endif 865 endif 866endif 867ifdef CONFIG_HAVE_FENTRY 868 ifeq ($(call cc-option-yn, -mfentry),y) 869 CC_FLAGS_FTRACE += -mfentry 870 CC_FLAGS_USING += -DCC_USING_FENTRY 871 endif 872endif 873export CC_FLAGS_FTRACE 874KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 875KBUILD_AFLAGS += $(CC_FLAGS_USING) 876ifdef CONFIG_DYNAMIC_FTRACE 877 ifdef CONFIG_HAVE_C_RECORDMCOUNT 878 BUILD_C_RECORDMCOUNT := y 879 export BUILD_C_RECORDMCOUNT 880 endif 881endif 882endif 883 884# We trigger additional mismatches with less inlining 885ifdef CONFIG_DEBUG_SECTION_MISMATCH 886KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 887endif 888 889ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 890KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 891LDFLAGS_vmlinux += --gc-sections 892endif 893 894ifdef CONFIG_SHADOW_CALL_STACK 895CC_FLAGS_SCS := -fsanitize=shadow-call-stack 896KBUILD_CFLAGS += $(CC_FLAGS_SCS) 897export CC_FLAGS_SCS 898endif 899 900ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B 901KBUILD_CFLAGS += -falign-functions=32 902endif 903 904# arch Makefile may override CC so keep this after arch Makefile is included 905NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 906 907# warn about C99 declaration after statement 908KBUILD_CFLAGS += -Wdeclaration-after-statement 909 910# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 911KBUILD_CFLAGS += -Wvla 912 913# disable pointer signed / unsigned warnings in gcc 4.0 914KBUILD_CFLAGS += -Wno-pointer-sign 915 916# disable stringop warnings in gcc 8+ 917KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 918 919# We'll want to enable this eventually, but it's not going away for 5.7 at least 920KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) 921KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) 922KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) 923 924# Another good warning that we'll want to enable eventually 925KBUILD_CFLAGS += $(call cc-disable-warning, restrict) 926 927# Enabled with W=2, disabled by default as noisy 928KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized) 929 930# disable invalid "can't wrap" optimizations for signed / pointers 931KBUILD_CFLAGS += -fno-strict-overflow 932 933# Make sure -fstack-check isn't enabled (like gentoo apparently did) 934KBUILD_CFLAGS += -fno-stack-check 935 936# conserve stack if available 937KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 938 939# Prohibit date/time macros, which would make the build non-deterministic 940KBUILD_CFLAGS += -Werror=date-time 941 942# enforce correct pointer usage 943KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 944 945# Require designated initializers for all marked structures 946KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 947 948# change __FILE__ to the relative path from the srctree 949KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 950 951# ensure -fcf-protection is disabled when using retpoline as it is 952# incompatible with -mindirect-branch=thunk-extern 953ifdef CONFIG_RETPOLINE 954KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none) 955endif 956 957# include additional Makefiles when needed 958include-y := scripts/Makefile.extrawarn 959include-$(CONFIG_KASAN) += scripts/Makefile.kasan 960include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan 961include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan 962include-$(CONFIG_KCOV) += scripts/Makefile.kcov 963include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins 964 965include $(addprefix $(srctree)/, $(include-y)) 966 967# scripts/Makefile.gcc-plugins is intentionally included last. 968# Do not add $(call cc-option,...) below this line. When you build the kernel 969# from the clean source tree, the GCC plugins do not exist at this point. 970 971# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 972KBUILD_CPPFLAGS += $(KCPPFLAGS) 973KBUILD_AFLAGS += $(KAFLAGS) 974KBUILD_CFLAGS += $(KCFLAGS) 975 976KBUILD_LDFLAGS_MODULE += --build-id=sha1 977LDFLAGS_vmlinux += --build-id=sha1 978 979ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 980LDFLAGS_vmlinux += $(call ld-option, -X,) 981endif 982 983ifeq ($(CONFIG_RELR),y) 984LDFLAGS_vmlinux += --pack-dyn-relocs=relr 985endif 986 987# We never want expected sections to be placed heuristically by the 988# linker. All sections should be explicitly named in the linker script. 989ifdef CONFIG_LD_ORPHAN_WARN 990LDFLAGS_vmlinux += --orphan-handling=warn 991endif 992 993# Align the bit size of userspace programs with the kernel 994KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 995KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) 996 997# make the checker run with the right architecture 998CHECKFLAGS += --arch=$(ARCH) 999 1000# insure the checker run with the right endianness 1001CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 1002 1003# the checker needs the correct machine size 1004CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 1005 1006# Default kernel image to build when no specific target is given. 1007# KBUILD_IMAGE may be overruled on the command line or 1008# set in the environment 1009# Also any assignments in arch/$(ARCH)/Makefile take precedence over 1010# this default value 1011export KBUILD_IMAGE ?= vmlinux 1012 1013# 1014# INSTALL_PATH specifies where to place the updated kernel and system map 1015# images. Default is /boot, but you can set it to other values 1016export INSTALL_PATH ?= /boot 1017 1018# 1019# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 1020# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 1021# an argument if needed. Otherwise it defaults to the kernel install path 1022# 1023export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 1024 1025# 1026# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 1027# relocations required by build roots. This is not defined in the 1028# makefile but the argument can be passed to make if needed. 1029# 1030 1031MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 1032export MODLIB 1033 1034# 1035# INSTALL_MOD_STRIP, if defined, will cause modules to be 1036# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 1037# the default option --strip-debug will be used. Otherwise, 1038# INSTALL_MOD_STRIP value will be used as the options to the strip command. 1039 1040ifdef INSTALL_MOD_STRIP 1041ifeq ($(INSTALL_MOD_STRIP),1) 1042mod_strip_cmd = $(STRIP) --strip-debug 1043else 1044mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 1045endif # INSTALL_MOD_STRIP=1 1046else 1047mod_strip_cmd = true 1048endif # INSTALL_MOD_STRIP 1049export mod_strip_cmd 1050 1051# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 1052# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 1053# or CONFIG_MODULE_COMPRESS_XZ. 1054 1055mod_compress_cmd = true 1056ifdef CONFIG_MODULE_COMPRESS 1057 ifdef CONFIG_MODULE_COMPRESS_GZIP 1058 mod_compress_cmd = $(KGZIP) -n -f 1059 endif # CONFIG_MODULE_COMPRESS_GZIP 1060 ifdef CONFIG_MODULE_COMPRESS_XZ 1061 mod_compress_cmd = $(XZ) -f 1062 endif # CONFIG_MODULE_COMPRESS_XZ 1063endif # CONFIG_MODULE_COMPRESS 1064export mod_compress_cmd 1065 1066ifdef CONFIG_MODULE_SIG_ALL 1067$(eval $(call config_filename,MODULE_SIG_KEY)) 1068 1069mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 1070else 1071mod_sign_cmd = true 1072endif 1073export mod_sign_cmd 1074 1075HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) 1076 1077has_libelf = $(call try-run,\ 1078 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) 1079 1080ifdef CONFIG_STACK_VALIDATION 1081 ifeq ($(has_libelf),1) 1082 objtool_target := tools/objtool FORCE 1083 else 1084 SKIP_STACK_VALIDATION := 1 1085 export SKIP_STACK_VALIDATION 1086 endif 1087endif 1088 1089ifdef CONFIG_BPF 1090ifdef CONFIG_DEBUG_INFO_BTF 1091 ifeq ($(has_libelf),1) 1092 resolve_btfids_target := tools/bpf/resolve_btfids FORCE 1093 else 1094 ERROR_RESOLVE_BTFIDS := 1 1095 endif 1096endif # CONFIG_DEBUG_INFO_BTF 1097endif # CONFIG_BPF 1098 1099PHONY += prepare0 1100 1101export MODORDER := $(extmod-prefix)modules.order 1102export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps 1103 1104ifeq ($(KBUILD_EXTMOD),) 1105core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 1106 1107vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ 1108 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 1109 $(libs-y) $(libs-m))) 1110 1111vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \ 1112 $(patsubst %/,%,$(filter %/, $(core-) \ 1113 $(drivers-) $(libs-)))) 1114 1115subdir-modorder := $(addsuffix modules.order,$(filter %/, \ 1116 $(core-y) $(core-m) $(libs-y) $(libs-m) \ 1117 $(drivers-y) $(drivers-m))) 1118 1119build-dirs := $(vmlinux-dirs) 1120clean-dirs := $(vmlinux-alldirs) 1121 1122# Externally visible symbols (used by link-vmlinux.sh) 1123KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) 1124KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) 1125ifdef CONFIG_MODULES 1126KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) 1127KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) 1128else 1129KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) 1130endif 1131KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) 1132 1133export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS 1134export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 1135# used by scripts/Makefile.package 1136export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools) 1137 1138vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) 1139 1140# Recurse until adjust_autoksyms.sh is satisfied 1141PHONY += autoksyms_recursive 1142ifdef CONFIG_TRIM_UNUSED_KSYMS 1143# For the kernel to actually contain only the needed exported symbols, 1144# we have to build modules as well to determine what those symbols are. 1145# (this can be evaluated only once include/config/auto.conf has been included) 1146KBUILD_MODULES := 1 1147 1148autoksyms_recursive: descend modules.order 1149 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1150 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1151endif 1152 1153autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1154 1155quiet_cmd_autoksyms_h = GEN $@ 1156 cmd_autoksyms_h = mkdir -p $(dir $@); \ 1157 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ 1158 1159$(autoksyms_h): 1160 $(call cmd,autoksyms_h) 1161 1162ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1163 1164# Final link of vmlinux with optional arch pass after final link 1165cmd_link-vmlinux = \ 1166 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \ 1167 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1168 1169vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1170 +$(call if_changed,link-vmlinux) 1171 1172targets := vmlinux 1173 1174# The actual objects are generated when descending, 1175# make sure no implicit rule kicks in 1176$(sort $(vmlinux-deps) $(subdir-modorder)): descend ; 1177 1178filechk_kernel.release = \ 1179 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1180 1181# Store (new) KERNELRELEASE string in include/config/kernel.release 1182include/config/kernel.release: FORCE 1183 $(call filechk,kernel.release) 1184 1185# Additional helpers built in scripts/ 1186# Carefully list dependencies so we do not try to build scripts twice 1187# in parallel 1188PHONY += scripts 1189scripts: scripts_basic scripts_dtc 1190 $(Q)$(MAKE) $(build)=$(@) 1191 1192# Things we need to do before we recursively start building the kernel 1193# or the modules are listed in "prepare". 1194# A multi level approach is used. prepareN is processed before prepareN-1. 1195# archprepare is used in arch Makefiles and when processed asm symlink, 1196# version.h and scripts_basic is processed / created. 1197 1198PHONY += prepare archprepare 1199 1200archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ 1201 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ 1202 include/generated/autoconf.h 1203 1204prepare0: archprepare 1205 $(Q)$(MAKE) $(build)=scripts/mod 1206 $(Q)$(MAKE) $(build)=. 1207 1208# All the preparing.. 1209prepare: prepare0 prepare-objtool prepare-resolve_btfids 1210 1211# Support for using generic headers in asm-generic 1212asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1213 1214PHONY += asm-generic uapi-asm-generic 1215asm-generic: uapi-asm-generic 1216 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ 1217 generic=include/asm-generic 1218uapi-asm-generic: 1219 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ 1220 generic=include/uapi/asm-generic 1221 1222PHONY += prepare-objtool prepare-resolve_btfids 1223prepare-objtool: $(objtool_target) 1224ifeq ($(SKIP_STACK_VALIDATION),1) 1225ifdef CONFIG_UNWINDER_ORC 1226 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1227 @false 1228else 1229 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1230endif 1231endif 1232 1233prepare-resolve_btfids: $(resolve_btfids_target) 1234ifeq ($(ERROR_RESOLVE_BTFIDS),1) 1235 @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1236 @false 1237endif 1238# Generate some files 1239# --------------------------------------------------------------------------- 1240 1241# KERNELRELEASE can change from a few different places, meaning version.h 1242# needs to be updated, so this check is forced on all builds 1243 1244uts_len := 64 1245define filechk_utsrelease.h 1246 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1247 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1248 exit 1; \ 1249 fi; \ 1250 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1251endef 1252 1253define filechk_version.h 1254 echo \#define LINUX_VERSION_CODE $(shell \ 1255 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1256 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))' 1257endef 1258 1259$(version_h): FORCE 1260 $(call filechk,version.h) 1261 $(Q)rm -f $(old_version_h) 1262 1263include/generated/utsrelease.h: include/config/kernel.release FORCE 1264 $(call filechk,utsrelease.h) 1265 1266PHONY += headerdep 1267headerdep: 1268 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1269 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1270 1271# --------------------------------------------------------------------------- 1272# Kernel headers 1273 1274#Default location for installed headers 1275export INSTALL_HDR_PATH = $(objtree)/usr 1276 1277quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include 1278 cmd_headers_install = \ 1279 mkdir -p $(INSTALL_HDR_PATH); \ 1280 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ 1281 usr/include $(INSTALL_HDR_PATH) 1282 1283PHONY += headers_install 1284headers_install: headers 1285 $(call cmd,headers_install) 1286 1287PHONY += archheaders archscripts 1288 1289hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 1290 1291PHONY += headers 1292headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts 1293 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1294 $(error Headers not exportable for the $(SRCARCH) architecture)) 1295 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1296 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi 1297 1298# Deprecated. It is no-op now. 1299PHONY += headers_check 1300headers_check: 1301 @: 1302 1303ifdef CONFIG_HEADERS_INSTALL 1304prepare: headers 1305endif 1306 1307PHONY += scripts_unifdef 1308scripts_unifdef: scripts_basic 1309 $(Q)$(MAKE) $(build)=scripts scripts/unifdef 1310 1311# --------------------------------------------------------------------------- 1312# Kernel selftest 1313 1314PHONY += kselftest 1315kselftest: 1316 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1317 1318kselftest-%: FORCE 1319 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* 1320 1321PHONY += kselftest-merge 1322kselftest-merge: 1323 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1324 $(Q)find $(srctree)/tools/testing/selftests -name config | \ 1325 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config 1326 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1327 1328# --------------------------------------------------------------------------- 1329# Devicetree files 1330 1331ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1332dtstree := arch/$(SRCARCH)/boot/dts 1333endif 1334 1335ifneq ($(dtstree),) 1336 1337%.dtb: include/config/kernel.release scripts_dtc 1338 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1339 1340PHONY += dtbs dtbs_install dtbs_check 1341dtbs: include/config/kernel.release scripts_dtc 1342 $(Q)$(MAKE) $(build)=$(dtstree) 1343 1344ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) 1345export CHECK_DTBS=y 1346dtbs: dt_binding_check 1347endif 1348 1349dtbs_check: dtbs 1350 1351dtbs_install: 1352 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) 1353 1354ifdef CONFIG_OF_EARLY_FLATTREE 1355all: dtbs 1356endif 1357 1358endif 1359 1360PHONY += scripts_dtc 1361scripts_dtc: scripts_basic 1362 $(Q)$(MAKE) $(build)=scripts/dtc 1363 1364ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) 1365export CHECK_DT_BINDING=y 1366endif 1367 1368PHONY += dt_binding_check 1369dt_binding_check: scripts_dtc 1370 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1371 1372# --------------------------------------------------------------------------- 1373# Modules 1374 1375ifdef CONFIG_MODULES 1376 1377# By default, build modules as well 1378 1379all: modules 1380 1381# When we're building modules with modversions, we need to consider 1382# the built-in objects during the descend as well, in order to 1383# make sure the checksums are up to date before we record them. 1384ifdef CONFIG_MODVERSIONS 1385 KBUILD_BUILTIN := 1 1386endif 1387 1388# Build modules 1389# 1390# A module can be listed more than once in obj-m resulting in 1391# duplicate lines in modules.order files. Those are removed 1392# using awk while concatenating to the final file. 1393 1394PHONY += modules 1395modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare 1396 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1397 1398PHONY += modules_check 1399modules_check: modules.order 1400 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< 1401 1402cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@ 1403 1404modules.order: $(subdir-modorder) FORCE 1405 $(call if_changed,modules_order) 1406 1407targets += modules.order 1408 1409# Target to prepare building external modules 1410PHONY += modules_prepare 1411modules_prepare: prepare 1412 $(Q)$(MAKE) $(build)=scripts scripts/module.lds 1413 1414# Target to install modules 1415PHONY += modules_install 1416modules_install: _modinst_ _modinst_post 1417 1418PHONY += _modinst_ 1419_modinst_: 1420 @rm -rf $(MODLIB)/kernel 1421 @rm -f $(MODLIB)/source 1422 @mkdir -p $(MODLIB)/kernel 1423 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1424 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1425 rm -f $(MODLIB)/build ; \ 1426 ln -s $(CURDIR) $(MODLIB)/build ; \ 1427 fi 1428 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order 1429 @cp -f modules.builtin $(MODLIB)/ 1430 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ 1431 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1432 1433# This depmod is only for convenience to give the initial 1434# boot a modules.dep even before / is mounted read-write. However the 1435# boot script depmod is the master version. 1436PHONY += _modinst_post 1437_modinst_post: _modinst_ 1438 $(call cmd,depmod) 1439 1440ifeq ($(CONFIG_MODULE_SIG), y) 1441PHONY += modules_sign 1442modules_sign: 1443 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1444endif 1445 1446else # CONFIG_MODULES 1447 1448# Modules not configured 1449# --------------------------------------------------------------------------- 1450 1451PHONY += modules modules_install 1452modules modules_install: 1453 @echo >&2 1454 @echo >&2 "The present kernel configuration has modules disabled." 1455 @echo >&2 "Type 'make config' and enable loadable module support." 1456 @echo >&2 "Then build a kernel with module support enabled." 1457 @echo >&2 1458 @exit 1 1459 1460endif # CONFIG_MODULES 1461 1462### 1463# Cleaning is done on three levels. 1464# make clean Delete most generated files 1465# Leave enough to build external modules 1466# make mrproper Delete the current configuration, and all generated files 1467# make distclean Remove editor backup files, patch leftover files and the like 1468 1469# Directories & files removed with 'make clean' 1470CLEAN_FILES += include/ksym vmlinux.symvers \ 1471 modules.builtin modules.builtin.modinfo modules.nsdeps \ 1472 compile_commands.json 1473 1474# Directories & files removed with 'make mrproper' 1475MRPROPER_FILES += include/config include/generated \ 1476 arch/$(SRCARCH)/include/generated .tmp_objdiff \ 1477 debian snap tar-install \ 1478 .config .config.old .version \ 1479 Module.symvers \ 1480 signing_key.pem signing_key.priv signing_key.x509 \ 1481 x509.genkey extra_certificates signing_key.x509.keyid \ 1482 signing_key.x509.signer vmlinux-gdb.py \ 1483 *.spec 1484 1485# Directories & files removed with 'make distclean' 1486DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS 1487 1488# clean - Delete most, but leave enough to build external modules 1489# 1490clean: rm-files := $(CLEAN_FILES) 1491 1492PHONY += archclean vmlinuxclean 1493 1494vmlinuxclean: 1495 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1496 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1497 1498clean: archclean vmlinuxclean 1499 1500# mrproper - Delete all generated files, including .config 1501# 1502mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1503mrproper-dirs := $(addprefix _mrproper_,scripts) 1504 1505PHONY += $(mrproper-dirs) mrproper 1506$(mrproper-dirs): 1507 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1508 1509mrproper: clean $(mrproper-dirs) 1510 $(call cmd,rmfiles) 1511 1512# distclean 1513# 1514distclean: rm-files := $(wildcard $(DISTCLEAN_FILES)) 1515 1516PHONY += distclean 1517 1518distclean: mrproper 1519 $(call cmd,rmfiles) 1520 @find $(srctree) $(RCS_FIND_IGNORE) \ 1521 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1522 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1523 -o -name 'core' \) \ 1524 -type f -print | xargs rm -f 1525 1526 1527# Packaging of the kernel to various formats 1528# --------------------------------------------------------------------------- 1529 1530%src-pkg: FORCE 1531 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1532%pkg: include/config/kernel.release FORCE 1533 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ 1534 1535# Brief documentation of the typical targets used 1536# --------------------------------------------------------------------------- 1537 1538boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1539boards := $(sort $(notdir $(boards))) 1540board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1541board-dirs := $(sort $(notdir $(board-dirs:/=))) 1542 1543PHONY += help 1544help: 1545 @echo 'Cleaning targets:' 1546 @echo ' clean - Remove most generated files but keep the config and' 1547 @echo ' enough build support to build external modules' 1548 @echo ' mrproper - Remove all generated files + config + various backup files' 1549 @echo ' distclean - mrproper + remove editor backup and patch files' 1550 @echo '' 1551 @echo 'Configuration targets:' 1552 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1553 @echo '' 1554 @echo 'Other generic targets:' 1555 @echo ' all - Build all targets marked with [*]' 1556 @echo '* vmlinux - Build the bare kernel' 1557 @echo '* modules - Build all modules' 1558 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1559 @echo ' dir/ - Build all files in dir and below' 1560 @echo ' dir/file.[ois] - Build specified target only' 1561 @echo ' dir/file.ll - Build the LLVM assembly file' 1562 @echo ' (requires compiler support for LLVM assembly generation)' 1563 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1564 @echo ' (requires a recent binutils and recent build (System.map))' 1565 @echo ' dir/file.ko - Build module including final link' 1566 @echo ' modules_prepare - Set up for building external modules' 1567 @echo ' tags/TAGS - Generate tags file for editors' 1568 @echo ' cscope - Generate cscope index' 1569 @echo ' gtags - Generate GNU GLOBAL index' 1570 @echo ' kernelrelease - Output the release version string (use with make -s)' 1571 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1572 @echo ' image_name - Output the image name (use with make -s)' 1573 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1574 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1575 echo '' 1576 @echo 'Static analysers:' 1577 @echo ' checkstack - Generate a list of stack hogs' 1578 @echo ' versioncheck - Sanity check on version.h usage' 1579 @echo ' includecheck - Check for duplicate included header files' 1580 @echo ' export_report - List the usages of all exported symbols' 1581 @echo ' headerdep - Detect inclusion cycles in headers' 1582 @echo ' coccicheck - Check with Coccinelle' 1583 @echo ' clang-analyzer - Check with clang static analyzer' 1584 @echo ' clang-tidy - Check with clang-tidy' 1585 @echo '' 1586 @echo 'Tools:' 1587 @echo ' nsdeps - Generate missing symbol namespace dependencies' 1588 @echo '' 1589 @echo 'Kernel selftest:' 1590 @echo ' kselftest - Build and run kernel selftest' 1591 @echo ' Build, install, and boot kernel before' 1592 @echo ' running kselftest on it' 1593 @echo ' Run as root for full coverage' 1594 @echo ' kselftest-all - Build kernel selftest' 1595 @echo ' kselftest-install - Build and install kernel selftest' 1596 @echo ' kselftest-clean - Remove all generated kselftest files' 1597 @echo ' kselftest-merge - Merge all the config dependencies of' 1598 @echo ' kselftest to existing .config.' 1599 @echo '' 1600 @$(if $(dtstree), \ 1601 echo 'Devicetree:'; \ 1602 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1603 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1604 echo ' dt_binding_check - Validate device tree binding documents'; \ 1605 echo ' dtbs_check - Validate device tree source files';\ 1606 echo '') 1607 1608 @echo 'Userspace tools targets:' 1609 @echo ' use "make tools/help"' 1610 @echo ' or "cd tools; make help"' 1611 @echo '' 1612 @echo 'Kernel packaging:' 1613 @$(MAKE) -f $(srctree)/scripts/Makefile.package help 1614 @echo '' 1615 @echo 'Documentation targets:' 1616 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1617 @echo '' 1618 @echo 'Architecture specific targets ($(SRCARCH)):' 1619 @$(if $(archhelp),$(archhelp),\ 1620 echo ' No architecture specific help defined for $(SRCARCH)') 1621 @echo '' 1622 @$(if $(boards), \ 1623 $(foreach b, $(boards), \ 1624 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1625 echo '') 1626 @$(if $(board-dirs), \ 1627 $(foreach b, $(board-dirs), \ 1628 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1629 printf " %-16s - Show all of the above\\n" help-boards; \ 1630 echo '') 1631 1632 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1633 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1634 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1635 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK' 1636 @echo ' (sparse by default)' 1637 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1638 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1639 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where' 1640 @echo ' 1: warnings which may be relevant and do not occur too often' 1641 @echo ' 2: warnings which occur quite often but may still be relevant' 1642 @echo ' 3: more obscure warnings, can most likely be ignored' 1643 @echo ' Multiple levels can be combined with W=12 or W=123' 1644 @echo '' 1645 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1646 @echo 'For further info see the ./README file' 1647 1648 1649help-board-dirs := $(addprefix help-,$(board-dirs)) 1650 1651help-boards: $(help-board-dirs) 1652 1653boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1654 1655$(help-board-dirs): help-%: 1656 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1657 @$(if $(boards-per-dir), \ 1658 $(foreach b, $(boards-per-dir), \ 1659 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1660 echo '') 1661 1662 1663# Documentation targets 1664# --------------------------------------------------------------------------- 1665DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1666 linkcheckdocs dochelp refcheckdocs 1667PHONY += $(DOC_TARGETS) 1668$(DOC_TARGETS): 1669 $(Q)$(MAKE) $(build)=Documentation $@ 1670 1671# Misc 1672# --------------------------------------------------------------------------- 1673 1674PHONY += scripts_gdb 1675scripts_gdb: prepare0 1676 $(Q)$(MAKE) $(build)=scripts/gdb 1677 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1678 1679ifdef CONFIG_GDB_SCRIPTS 1680all: scripts_gdb 1681endif 1682 1683else # KBUILD_EXTMOD 1684 1685### 1686# External module support. 1687# When building external modules the kernel used as basis is considered 1688# read-only, and no consistency checks are made and the make 1689# system is not used on the basis kernel. If updates are required 1690# in the basis kernel ordinary make commands (without M=...) must 1691# be used. 1692# 1693# The following are the only valid targets when building external 1694# modules. 1695# make M=dir clean Delete all automatically generated files 1696# make M=dir modules Make all modules in specified dir 1697# make M=dir Same as 'make M=dir modules' 1698# make M=dir modules_install 1699# Install the modules built in the module directory 1700# Assumes install directory is already created 1701 1702# We are always building only modules. 1703KBUILD_BUILTIN := 1704KBUILD_MODULES := 1 1705 1706build-dirs := $(KBUILD_EXTMOD) 1707PHONY += modules 1708modules: $(MODORDER) 1709 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1710 1711$(MODORDER): descend 1712 @: 1713 1714PHONY += modules_install 1715modules_install: _emodinst_ _emodinst_post 1716 1717install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1718PHONY += _emodinst_ 1719_emodinst_: 1720 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1721 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1722 1723PHONY += _emodinst_post 1724_emodinst_post: _emodinst_ 1725 $(call cmd,depmod) 1726 1727compile_commands.json: $(extmod-prefix)compile_commands.json 1728PHONY += compile_commands.json 1729 1730clean-dirs := $(KBUILD_EXTMOD) 1731clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ 1732 $(KBUILD_EXTMOD)/compile_commands.json 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 += prepare modules_prepare 1746 1747endif # KBUILD_EXTMOD 1748 1749# Single targets 1750# --------------------------------------------------------------------------- 1751# To build individual files in subdirectories, you can do like this: 1752# 1753# make foo/bar/baz.s 1754# 1755# The supported suffixes for single-target are listed in 'single-targets' 1756# 1757# To build only under specific subdirectories, you can do like this: 1758# 1759# make foo/bar/baz/ 1760 1761ifdef single-build 1762 1763# .ko is special because modpost is needed 1764single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) 1765single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS))) 1766 1767$(single-ko): single_modpost 1768 @: 1769$(single-no-ko): descend 1770 @: 1771 1772ifeq ($(KBUILD_EXTMOD),) 1773# For the single build of in-tree modules, use a temporary file to avoid 1774# the situation of modules_install installing an invalid modules.order. 1775MODORDER := .modules.tmp 1776endif 1777 1778PHONY += single_modpost 1779single_modpost: $(single-no-ko) modules_prepare 1780 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER) 1781 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1782 1783KBUILD_MODULES := 1 1784 1785export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko)) 1786 1787# trim unrelated directories 1788build-dirs := $(foreach d, $(build-dirs), \ 1789 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d))) 1790 1791endif 1792 1793ifndef CONFIG_MODULES 1794KBUILD_MODULES := 1795endif 1796 1797# Handle descending into subdirectories listed in $(build-dirs) 1798# Preset locale variables to speed up the build process. Limit locale 1799# tweaks to this spot to avoid wrong language settings when running 1800# make menuconfig etc. 1801# Error messages still appears in the original language 1802PHONY += descend $(build-dirs) 1803descend: $(build-dirs) 1804$(build-dirs): prepare 1805 $(Q)$(MAKE) $(build)=$@ \ 1806 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \ 1807 need-builtin=1 need-modorder=1 1808 1809clean-dirs := $(addprefix _clean_, $(clean-dirs)) 1810PHONY += $(clean-dirs) clean 1811$(clean-dirs): 1812 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1813 1814clean: $(clean-dirs) 1815 $(call cmd,rmfiles) 1816 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1817 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1818 -o -name '*.ko.*' \ 1819 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1820 -o -name '*.dwo' -o -name '*.lst' \ 1821 -o -name '*.su' -o -name '*.mod' \ 1822 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1823 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1824 -o -name '*.asn1.[ch]' \ 1825 -o -name '*.symtypes' -o -name 'modules.order' \ 1826 -o -name '.tmp_*.o.*' \ 1827 -o -name '*.c.[012]*.*' \ 1828 -o -name '*.ll' \ 1829 -o -name '*.gcno' \) -type f -print | xargs rm -f 1830 1831# Generate tags for editors 1832# --------------------------------------------------------------------------- 1833quiet_cmd_tags = GEN $@ 1834 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ 1835 1836tags TAGS cscope gtags: FORCE 1837 $(call cmd,tags) 1838 1839# Script to generate missing namespace dependencies 1840# --------------------------------------------------------------------------- 1841 1842PHONY += nsdeps 1843nsdeps: export KBUILD_NSDEPS=1 1844nsdeps: modules 1845 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps 1846 1847# Clang Tooling 1848# --------------------------------------------------------------------------- 1849 1850quiet_cmd_gen_compile_commands = GEN $@ 1851 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) 1852 1853$(extmod-prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ 1854 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \ 1855 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE 1856 $(call if_changed,gen_compile_commands) 1857 1858targets += $(extmod-prefix)compile_commands.json 1859 1860PHONY += clang-tidy clang-analyzer 1861 1862ifdef CONFIG_CC_IS_CLANG 1863quiet_cmd_clang_tools = CHECK $< 1864 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< 1865 1866clang-tidy clang-analyzer: $(extmod-prefix)compile_commands.json 1867 $(call cmd,clang_tools) 1868else 1869clang-tidy clang-analyzer: 1870 @echo "$@ requires CC=clang" >&2 1871 @false 1872endif 1873 1874# Scripts to check various things for consistency 1875# --------------------------------------------------------------------------- 1876 1877PHONY += includecheck versioncheck coccicheck export_report 1878 1879includecheck: 1880 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1881 -name '*.[hcS]' -type f -print | sort \ 1882 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1883 1884versioncheck: 1885 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1886 -name '*.[hcS]' -type f -print | sort \ 1887 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1888 1889coccicheck: 1890 $(Q)$(BASH) $(srctree)/scripts/$@ 1891 1892export_report: 1893 $(PERL) $(srctree)/scripts/export_report.pl 1894 1895PHONY += checkstack kernelrelease kernelversion image_name 1896 1897# UML needs a little special treatment here. It wants to use the host 1898# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1899# else wants $(ARCH), including people doing cross-builds, which means 1900# that $(SUBARCH) doesn't work here. 1901ifeq ($(ARCH), um) 1902CHECKSTACK_ARCH := $(SUBARCH) 1903else 1904CHECKSTACK_ARCH := $(ARCH) 1905endif 1906checkstack: 1907 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1908 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1909 1910kernelrelease: 1911 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1912 1913kernelversion: 1914 @echo $(KERNELVERSION) 1915 1916image_name: 1917 @echo $(KBUILD_IMAGE) 1918 1919# Clear a bunch of variables before executing the submake 1920 1921ifeq ($(quiet),silent_) 1922tools_silent=s 1923endif 1924 1925tools/: FORCE 1926 $(Q)mkdir -p $(objtree)/tools 1927 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ 1928 1929tools/%: FORCE 1930 $(Q)mkdir -p $(objtree)/tools 1931 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* 1932 1933quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1934 cmd_rmfiles = rm -rf $(rm-files) 1935 1936# Run depmod only if we have System.map and depmod is executable 1937quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1938 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1939 $(KERNELRELEASE) 1940 1941# read saved command lines for existing targets 1942existing-targets := $(wildcard $(sort $(targets))) 1943 1944-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1945 1946endif # config-build 1947endif # mixed-build 1948endif # need-sub-make 1949 1950PHONY += FORCE 1951FORCE: 1952 1953# Declare the contents of the PHONY variable as phony. We keep that 1954# information in a variable so we can use it in if_changed and friends. 1955.PHONY: $(PHONY) 1956
