1# SPDX-License-Identifier: GPL-2.0 2VERSION = 5 3PATCHLEVEL = 0 4SUBLEVEL = 0 5EXTRAVERSION = -rc1 6NAME = Shy Crocodile 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# That's our default target when none is given on the command line 15PHONY := _all 16_all: 17 18# Do not use make's built-in rules and variables 19# (this increases performance and avoids hard-to-debug behaviour) 20MAKEFLAGS += -rR 21 22# Avoid funny character set dependencies 23unexport LC_ALL 24LC_COLLATE=C 25LC_NUMERIC=C 26export LC_COLLATE LC_NUMERIC 27 28# Avoid interference with shell env settings 29unexport GREP_OPTIONS 30 31# We are using a recursive build, so we need to do a little thinking 32# to get the ordering right. 33# 34# Most importantly: sub-Makefiles should only ever modify files in 35# their own directory. If in some directory we have a dependency on 36# a file in another dir (which doesn't happen often, but it's often 37# unavoidable when linking the built-in.a targets which finally 38# turn into vmlinux), we will call a sub make in that other dir, and 39# after that we are sure that everything which is in that other dir 40# is now up to date. 41# 42# The only cases where we need to modify files which have global 43# effects are thus separated out and done before the recursive 44# descending is started. They are now explicitly listed as the 45# prepare rule. 46 47# Beautify output 48# --------------------------------------------------------------------------- 49# 50# Normally, we echo the whole command before executing it. By making 51# that echo $($(quiet)$(cmd)), we now have the possibility to set 52# $(quiet) to choose other forms of output instead, e.g. 53# 54# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 55# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 56# 57# If $(quiet) is empty, the whole command will be printed. 58# If it is set to "quiet_", only the short version will be printed. 59# If it is set to "silent_", nothing will be printed at all, since 60# the variable $(silent_cmd_cc_o_c) doesn't exist. 61# 62# A simple variant is to prefix commands with $(Q) - that's useful 63# for commands that shall be hidden in non-verbose mode. 64# 65# $(Q)ln $@ :< 66# 67# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 68# If KBUILD_VERBOSE equals 1 then the above command is displayed. 69# 70# To put more focus on warnings, be less verbose as default 71# Use 'make V=1' to see the full commands 72 73ifeq ("$(origin V)", "command line") 74 KBUILD_VERBOSE = $(V) 75endif 76ifndef KBUILD_VERBOSE 77 KBUILD_VERBOSE = 0 78endif 79 80ifeq ($(KBUILD_VERBOSE),1) 81 quiet = 82 Q = 83else 84 quiet=quiet_ 85 Q = @ 86endif 87 88# If the user is running make -s (silent mode), suppress echoing of 89# commands 90 91ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 92 quiet=silent_ 93 tools_silent=s 94endif 95 96export quiet Q KBUILD_VERBOSE 97 98# kbuild supports saving output files in a separate directory. 99# To locate output files in a separate directory two syntaxes are supported. 100# In both cases the working directory must be the root of the kernel src. 101# 1) O= 102# Use "make O=dir/to/store/output/files/" 103# 104# 2) Set KBUILD_OUTPUT 105# Set the environment variable KBUILD_OUTPUT to point to the directory 106# where the output files shall be placed. 107# export KBUILD_OUTPUT=dir/to/store/output/files/ 108# make 109# 110# The O= assignment takes precedence over the KBUILD_OUTPUT environment 111# variable. 112 113# KBUILD_SRC is not intended to be used by the regular user (for now), 114# it is set on invocation of make with KBUILD_OUTPUT or O= specified. 115ifeq ($(KBUILD_SRC),) 116 117# OK, Make called in directory where kernel src resides 118# Do we want to locate output files in a separate directory? 119ifeq ("$(origin O)", "command line") 120 KBUILD_OUTPUT := $(O) 121endif 122 123# Cancel implicit rules on top Makefile 124$(CURDIR)/Makefile Makefile: ; 125 126ifneq ($(words $(subst :, ,$(CURDIR))), 1) 127 $(error main directory cannot contain spaces nor colons) 128endif 129 130ifneq ($(KBUILD_OUTPUT),) 131# check that the output directory actually exists 132saved-output := $(KBUILD_OUTPUT) 133KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \ 134 && pwd) 135$(if $(KBUILD_OUTPUT),, \ 136 $(error failed to create output directory "$(saved-output)")) 137 138# Look for make include files relative to root of kernel src 139# 140# This does not become effective immediately because MAKEFLAGS is re-parsed 141# once after the Makefile is read. It is OK since we are going to invoke 142# 'sub-make' below. 143MAKEFLAGS += --include-dir=$(CURDIR) 144 145PHONY += $(MAKECMDGOALS) sub-make 146 147$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make 148 @: 149 150# Invoke a second make in the output directory, passing relevant variables 151sub-make: 152 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \ 153 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS)) 154 155# Leave processing to above invocation of make 156skip-makefile := 1 157endif # ifneq ($(KBUILD_OUTPUT),) 158endif # ifeq ($(KBUILD_SRC),) 159 160# We process the rest of the Makefile if this is the final invocation of make 161ifeq ($(skip-makefile),) 162 163# Do not print "Entering directory ...", 164# but we want to display it when entering to the output directory 165# so that IDEs/editors are able to understand relative filenames. 166MAKEFLAGS += --no-print-directory 167 168# Call a source code checker (by default, "sparse") as part of the 169# C compilation. 170# 171# Use 'make C=1' to enable checking of only re-compiled files. 172# Use 'make C=2' to enable checking of *all* source files, regardless 173# of whether they are re-compiled or not. 174# 175# See the file "Documentation/dev-tools/sparse.rst" for more details, 176# including where to get the "sparse" utility. 177 178ifeq ("$(origin C)", "command line") 179 KBUILD_CHECKSRC = $(C) 180endif 181ifndef KBUILD_CHECKSRC 182 KBUILD_CHECKSRC = 0 183endif 184 185# Use make M=dir to specify directory of external module to build 186# Old syntax make ... SUBDIRS=$PWD is still supported 187# Setting the environment variable KBUILD_EXTMOD take precedence 188ifdef SUBDIRS 189 $(warning ================= WARNING ================) 190 $(warning 'SUBDIRS' will be removed after Linux 5.3) 191 $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead) 192 $(warning ==========================================) 193 KBUILD_EXTMOD ?= $(SUBDIRS) 194endif 195 196ifeq ("$(origin M)", "command line") 197 KBUILD_EXTMOD := $(M) 198endif 199 200ifeq ($(KBUILD_SRC),) 201 # building in the source tree 202 srctree := . 203else 204 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR))) 205 # building in a subdirectory of the source tree 206 srctree := .. 207 else 208 srctree := $(KBUILD_SRC) 209 endif 210endif 211 212export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC 213 214objtree := . 215src := $(srctree) 216obj := $(objtree) 217 218VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD)) 219 220export srctree objtree VPATH 221 222# To make sure we do not include .config for any of the *config targets 223# catch them early, and hand them over to scripts/kconfig/Makefile 224# It is allowed to specify more targets when calling make, including 225# mixing *config targets and build targets. 226# For example 'make oldconfig all'. 227# Detect when mixed targets is specified, and make a second invocation 228# of make so .config is not included in this case either (for *config). 229 230version_h := include/generated/uapi/linux/version.h 231old_version_h := include/linux/version.h 232 233clean-targets := %clean mrproper cleandocs 234no-dot-config-targets := $(clean-targets) \ 235 cscope gtags TAGS tags help% %docs check% coccicheck \ 236 $(version_h) headers_% archheaders archscripts \ 237 %asm-generic kernelversion %src-pkg 238no-sync-config-targets := $(no-dot-config-targets) install %install \ 239 kernelrelease 240 241config-targets := 0 242mixed-targets := 0 243dot-config := 1 244may-sync-config := 1 245 246ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 247 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 248 dot-config := 0 249 endif 250endif 251 252ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) 253 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) 254 may-sync-config := 0 255 endif 256endif 257 258ifneq ($(KBUILD_EXTMOD),) 259 may-sync-config := 0 260endif 261 262ifeq ($(KBUILD_EXTMOD),) 263 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 264 config-targets := 1 265 ifneq ($(words $(MAKECMDGOALS)),1) 266 mixed-targets := 1 267 endif 268 endif 269endif 270 271# For "make -j clean all", "make -j mrproper defconfig all", etc. 272ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) 273 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) 274 mixed-targets := 1 275 endif 276endif 277 278# install and modules_install need also be processed one by one 279ifneq ($(filter install,$(MAKECMDGOALS)),) 280 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 281 mixed-targets := 1 282 endif 283endif 284 285ifeq ($(mixed-targets),1) 286# =========================================================================== 287# We're called with mixed targets (*config and build targets). 288# Handle them one by one. 289 290PHONY += $(MAKECMDGOALS) __build_one_by_one 291 292$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 293 @: 294 295__build_one_by_one: 296 $(Q)set -e; \ 297 for i in $(MAKECMDGOALS); do \ 298 $(MAKE) -f $(srctree)/Makefile $$i; \ 299 done 300 301else 302 303# We need some generic definitions (do not try to remake the file). 304scripts/Kbuild.include: ; 305include scripts/Kbuild.include 306 307# Read KERNELRELEASE from include/config/kernel.release (if it exists) 308KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 309KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 310export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 311 312include scripts/subarch.include 313 314# Cross compiling and selecting different set of gcc/bin-utils 315# --------------------------------------------------------------------------- 316# 317# When performing cross compilation for other architectures ARCH shall be set 318# to the target architecture. (See arch/* for the possibilities). 319# ARCH can be set during invocation of make: 320# make ARCH=ia64 321# Another way is to have ARCH set in the environment. 322# The default ARCH is the host where make is executed. 323 324# CROSS_COMPILE specify the prefix used for all executables used 325# during compilation. Only gcc and related bin-utils executables 326# are prefixed with $(CROSS_COMPILE). 327# CROSS_COMPILE can be set on the command line 328# make CROSS_COMPILE=ia64-linux- 329# Alternatively CROSS_COMPILE can be set in the environment. 330# Default value for CROSS_COMPILE is not to prefix executables 331# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 332ARCH ?= $(SUBARCH) 333 334# Architecture as present in compile.h 335UTS_MACHINE := $(ARCH) 336SRCARCH := $(ARCH) 337 338# Additional ARCH settings for x86 339ifeq ($(ARCH),i386) 340 SRCARCH := x86 341endif 342ifeq ($(ARCH),x86_64) 343 SRCARCH := x86 344endif 345 346# Additional ARCH settings for sparc 347ifeq ($(ARCH),sparc32) 348 SRCARCH := sparc 349endif 350ifeq ($(ARCH),sparc64) 351 SRCARCH := sparc 352endif 353 354# Additional ARCH settings for sh 355ifeq ($(ARCH),sh64) 356 SRCARCH := sh 357endif 358 359KCONFIG_CONFIG ?= .config 360export KCONFIG_CONFIG 361 362# SHELL used by kbuild 363CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 364 else if [ -x /bin/bash ]; then echo /bin/bash; \ 365 else echo sh; fi ; fi) 366 367HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null) 368HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null) 369HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null) 370 371HOSTCC = gcc 372HOSTCXX = g++ 373KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \ 374 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \ 375 $(HOSTCFLAGS) 376KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) 377KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) 378KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) 379 380# Make variables (CC, etc...) 381AS = $(CROSS_COMPILE)as 382LD = $(CROSS_COMPILE)ld 383CC = $(CROSS_COMPILE)gcc 384CPP = $(CC) -E 385AR = $(CROSS_COMPILE)ar 386NM = $(CROSS_COMPILE)nm 387STRIP = $(CROSS_COMPILE)strip 388OBJCOPY = $(CROSS_COMPILE)objcopy 389OBJDUMP = $(CROSS_COMPILE)objdump 390LEX = flex 391YACC = bison 392AWK = awk 393GENKSYMS = scripts/genksyms/genksyms 394INSTALLKERNEL := installkernel 395DEPMOD = /sbin/depmod 396PERL = perl 397PYTHON = python 398PYTHON2 = python2 399PYTHON3 = python3 400CHECK = sparse 401 402CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 403 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 404NOSTDINC_FLAGS = 405CFLAGS_MODULE = 406AFLAGS_MODULE = 407LDFLAGS_MODULE = 408CFLAGS_KERNEL = 409AFLAGS_KERNEL = 410LDFLAGS_vmlinux = 411 412# Use USERINCLUDE when you must reference the UAPI directories only. 413USERINCLUDE := \ 414 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 415 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 416 -I$(srctree)/include/uapi \ 417 -I$(objtree)/include/generated/uapi \ 418 -include $(srctree)/include/linux/kconfig.h 419 420# Use LINUXINCLUDE when you must reference the include/ directory. 421# Needed to be compatible with the O= option 422LINUXINCLUDE := \ 423 -I$(srctree)/arch/$(SRCARCH)/include \ 424 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 425 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 426 -I$(objtree)/include \ 427 $(USERINCLUDE) 428 429KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE 430KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ 431 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ 432 -Werror-implicit-function-declaration -Werror=implicit-int \ 433 -Wno-format-security \ 434 -std=gnu89 435KBUILD_CPPFLAGS := -D__KERNEL__ 436KBUILD_AFLAGS_KERNEL := 437KBUILD_CFLAGS_KERNEL := 438KBUILD_AFLAGS_MODULE := -DMODULE 439KBUILD_CFLAGS_MODULE := -DMODULE 440KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 441KBUILD_LDFLAGS := 442GCC_PLUGINS_CFLAGS := 443 444export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC 445export CPP AR NM STRIP OBJCOPY OBJDUMP KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS 446export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE 447export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 448 449export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS 450export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 451export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN 452export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 453export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 454export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 455export KBUILD_ARFLAGS 456 457# When compiling out-of-tree modules, put MODVERDIR in the module 458# tree rather than in the kernel tree. The kernel tree might 459# even be read-only. 460export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 461 462# Files to ignore in find ... statements 463 464export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 465 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 466 -prune -o 467export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 468 --exclude CVS --exclude .pc --exclude .hg --exclude .git 469 470# =========================================================================== 471# Rules shared between *config targets and build targets 472 473# Basic helpers built in scripts/basic/ 474PHONY += scripts_basic 475scripts_basic: 476 $(Q)$(MAKE) $(build)=scripts/basic 477 $(Q)rm -f .tmp_quiet_recordmcount 478 479# To avoid any implicit rule to kick in, define an empty command. 480scripts/basic/%: scripts_basic ; 481 482PHONY += outputmakefile 483# outputmakefile generates a Makefile in the output directory, if using a 484# separate output directory. This allows convenient use of make in the 485# output directory. 486outputmakefile: 487ifneq ($(KBUILD_SRC),) 488 $(Q)ln -fsn $(srctree) source 489 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree) 490endif 491 492ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),) 493ifneq ($(CROSS_COMPILE),) 494CLANG_FLAGS := --target=$(notdir $(CROSS_COMPILE:%-=%)) 495GCC_TOOLCHAIN_DIR := $(dir $(shell which $(LD))) 496CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR) 497GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) 498endif 499ifneq ($(GCC_TOOLCHAIN),) 500CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) 501endif 502CLANG_FLAGS += -no-integrated-as 503KBUILD_CFLAGS += $(CLANG_FLAGS) 504KBUILD_AFLAGS += $(CLANG_FLAGS) 505export CLANG_FLAGS 506endif 507 508RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 509RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register 510RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 511RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline 512RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 513RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) 514export RETPOLINE_CFLAGS 515export RETPOLINE_VDSO_CFLAGS 516 517# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. 518# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. 519# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), 520# and from include/config/auto.conf.cmd to detect the compiler upgrade. 521CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1) 522 523ifeq ($(config-targets),1) 524# =========================================================================== 525# *config targets only - make sure prerequisites are updated, and descend 526# in scripts/kconfig to make the *config target 527 528# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 529# KBUILD_DEFCONFIG may point out an alternative default configuration 530# used for 'make defconfig' 531include arch/$(SRCARCH)/Makefile 532export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT 533 534config: scripts_basic outputmakefile FORCE 535 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 536 537%config: scripts_basic outputmakefile FORCE 538 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 539 540else 541# =========================================================================== 542# Build targets only - this includes vmlinux, arch specific targets, clean 543# targets and others. In general all targets except *config targets. 544 545# If building an external module we do not care about the all: rule 546# but instead _all depend on modules 547PHONY += all 548ifeq ($(KBUILD_EXTMOD),) 549_all: all 550else 551_all: modules 552endif 553 554# Decide whether to build built-in, modular, or both. 555# Normally, just do built-in. 556 557KBUILD_MODULES := 558KBUILD_BUILTIN := 1 559 560# If we have only "make modules", don't compile built-in objects. 561# When we're building modules with modversions, we need to consider 562# the built-in objects during the descend as well, in order to 563# make sure the checksums are up to date before we record them. 564 565ifeq ($(MAKECMDGOALS),modules) 566 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 567endif 568 569# If we have "make <whatever> modules", compile modules 570# in addition to whatever we do anyway. 571# Just "make" or "make all" shall build modules as well 572 573ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 574 KBUILD_MODULES := 1 575endif 576 577ifeq ($(MAKECMDGOALS),) 578 KBUILD_MODULES := 1 579endif 580 581export KBUILD_MODULES KBUILD_BUILTIN 582 583ifeq ($(KBUILD_EXTMOD),) 584# Objects we will link into vmlinux / subdirs we need to visit 585init-y := init/ 586drivers-y := drivers/ sound/ firmware/ 587net-y := net/ 588libs-y := lib/ 589core-y := usr/ 590virt-y := virt/ 591endif # KBUILD_EXTMOD 592 593ifeq ($(dot-config),1) 594include include/config/auto.conf 595endif 596 597# The all: target is the default when no target is given on the 598# command line. 599# This allow a user to issue only 'make' to build a kernel including modules 600# Defaults to vmlinux, but the arch makefile usually adds further targets 601all: vmlinux 602 603CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ 604 $(call cc-option,-fno-tree-loop-im) \ 605 $(call cc-disable-warning,maybe-uninitialized,) 606export CFLAGS_GCOV 607 608# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. 609ifdef CONFIG_FUNCTION_TRACER 610 CC_FLAGS_FTRACE := -pg 611endif 612 613# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 614# values of the respective KBUILD_* variables 615ARCH_CPPFLAGS := 616ARCH_AFLAGS := 617ARCH_CFLAGS := 618include arch/$(SRCARCH)/Makefile 619 620ifeq ($(dot-config),1) 621ifeq ($(may-sync-config),1) 622# Read in dependencies to all Kconfig* files, make sure to run syncconfig if 623# changes are detected. This should be included after arch/$(SRCARCH)/Makefile 624# because some architectures define CROSS_COMPILE there. 625-include include/config/auto.conf.cmd 626 627# To avoid any implicit rule to kick in, define an empty command 628$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 629 630# The actual configuration files used during the build are stored in 631# include/generated/ and include/config/. Update them if .config is newer than 632# include/config/auto.conf (which mirrors .config). 633include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 634 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig 635else 636# External modules and some install targets need include/generated/autoconf.h 637# and include/config/auto.conf but do not care if they are up-to-date. 638# Use auto.conf to trigger the test 639PHONY += include/config/auto.conf 640 641include/config/auto.conf: 642 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 643 echo >&2; \ 644 echo >&2 " ERROR: Kernel configuration is invalid."; \ 645 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 646 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 647 echo >&2 ; \ 648 /bin/false) 649 650endif # may-sync-config 651endif # $(dot-config) 652 653KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 654KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 655KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 656KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 657KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context) 658 659ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 660KBUILD_CFLAGS += $(call cc-option,-Oz,-Os) 661KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,) 662else 663ifdef CONFIG_PROFILE_ALL_BRANCHES 664KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,) 665else 666KBUILD_CFLAGS += -O2 667endif 668endif 669 670KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \ 671 $(call cc-disable-warning,maybe-uninitialized,)) 672 673# Tell gcc to never replace conditional load with a non-conditional one 674KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 675 676include scripts/Makefile.kcov 677include scripts/Makefile.gcc-plugins 678 679ifdef CONFIG_READABLE_ASM 680# Disable optimizations that make assembler listings hard to read. 681# reorder blocks reorders the control in the function 682# ipa clone creates specialized cloned functions 683# partial inlining inlines only parts of functions 684KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 685 $(call cc-option,-fno-ipa-cp-clone,) \ 686 $(call cc-option,-fno-partial-inlining) 687endif 688 689ifneq ($(CONFIG_FRAME_WARN),0) 690KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 691endif 692 693stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector 694stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector 695stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong 696 697KBUILD_CFLAGS += $(stackp-flags-y) 698 699ifdef CONFIG_CC_IS_CLANG 700KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 701KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 702KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 703KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 704# Quiet clang warning: comparison of unsigned expression < 0 is always false 705KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 706# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 707# source of a reference will be _MergedGlobals and not on of the whitelisted names. 708# See modpost pattern 2 709KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 710KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 711else 712 713# These warnings generated too much noise in a regular build. 714# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 715KBUILD_CFLAGS += -Wno-unused-but-set-variable 716endif 717 718KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 719ifdef CONFIG_FRAME_POINTER 720KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 721else 722# Some targets (ARM with Thumb2, for example), can't be built with frame 723# pointers. For those, we don't have FUNCTION_TRACER automatically 724# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 725# incompatible with -fomit-frame-pointer with current GCC, so we don't use 726# -fomit-frame-pointer with FUNCTION_TRACER. 727ifndef CONFIG_FUNCTION_TRACER 728KBUILD_CFLAGS += -fomit-frame-pointer 729endif 730endif 731 732KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 733 734ifdef CONFIG_DEBUG_INFO 735ifdef CONFIG_DEBUG_INFO_SPLIT 736KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 737else 738KBUILD_CFLAGS += -g 739endif 740KBUILD_AFLAGS += -Wa,-gdwarf-2 741endif 742ifdef CONFIG_DEBUG_INFO_DWARF4 743KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 744endif 745 746ifdef CONFIG_DEBUG_INFO_REDUCED 747KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 748 $(call cc-option,-fno-var-tracking) 749endif 750 751ifdef CONFIG_FUNCTION_TRACER 752ifdef CONFIG_FTRACE_MCOUNT_RECORD 753 # gcc 5 supports generating the mcount tables directly 754 ifeq ($(call cc-option-yn,-mrecord-mcount),y) 755 CC_FLAGS_FTRACE += -mrecord-mcount 756 export CC_USING_RECORD_MCOUNT := 1 757 endif 758 ifdef CONFIG_HAVE_NOP_MCOUNT 759 ifeq ($(call cc-option-yn, -mnop-mcount),y) 760 CC_FLAGS_FTRACE += -mnop-mcount 761 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT 762 endif 763 endif 764endif 765ifdef CONFIG_HAVE_FENTRY 766 ifeq ($(call cc-option-yn, -mfentry),y) 767 CC_FLAGS_FTRACE += -mfentry 768 CC_FLAGS_USING += -DCC_USING_FENTRY 769 endif 770endif 771export CC_FLAGS_FTRACE 772KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) 773KBUILD_AFLAGS += $(CC_FLAGS_USING) 774ifdef CONFIG_DYNAMIC_FTRACE 775 ifdef CONFIG_HAVE_C_RECORDMCOUNT 776 BUILD_C_RECORDMCOUNT := y 777 export BUILD_C_RECORDMCOUNT 778 endif 779endif 780endif 781 782# We trigger additional mismatches with less inlining 783ifdef CONFIG_DEBUG_SECTION_MISMATCH 784KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 785endif 786 787ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 788KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections 789LDFLAGS_vmlinux += --gc-sections 790endif 791 792# arch Makefile may override CC so keep this after arch Makefile is included 793NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 794 795# warn about C99 declaration after statement 796KBUILD_CFLAGS += -Wdeclaration-after-statement 797 798# Variable Length Arrays (VLAs) should not be used anywhere in the kernel 799KBUILD_CFLAGS += $(call cc-option,-Wvla) 800 801# disable pointer signed / unsigned warnings in gcc 4.0 802KBUILD_CFLAGS += -Wno-pointer-sign 803 804# disable stringop warnings in gcc 8+ 805KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) 806 807# disable invalid "can't wrap" optimizations for signed / pointers 808KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 809 810# clang sets -fmerge-all-constants by default as optimization, but this 811# is non-conforming behavior for C and in fact breaks the kernel, so we 812# need to disable it here generally. 813KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) 814 815# for gcc -fno-merge-all-constants disables everything, but it is fine 816# to have actual conforming behavior enabled. 817KBUILD_CFLAGS += $(call cc-option,-fmerge-constants) 818 819# Make sure -fstack-check isn't enabled (like gentoo apparently did) 820KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 821 822# conserve stack if available 823KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 824 825# Prohibit date/time macros, which would make the build non-deterministic 826KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 827 828# enforce correct pointer usage 829KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 830 831# Require designated initializers for all marked structures 832KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 833 834# change __FILE__ to the relative path from the srctree 835KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) 836 837# use the deterministic mode of AR if available 838KBUILD_ARFLAGS := $(call ar-option,D) 839 840include scripts/Makefile.kasan 841include scripts/Makefile.extrawarn 842include scripts/Makefile.ubsan 843 844# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 845# last assignments 846KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 847KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 848KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 849 850# Use --build-id when available. 851LDFLAGS_BUILD_ID := $(call ld-option, --build-id) 852KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 853LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 854 855ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 856LDFLAGS_vmlinux += $(call ld-option, -X,) 857endif 858 859# insure the checker run with the right endianness 860CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) 861 862# the checker needs the correct machine size 863CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) 864 865# Default kernel image to build when no specific target is given. 866# KBUILD_IMAGE may be overruled on the command line or 867# set in the environment 868# Also any assignments in arch/$(ARCH)/Makefile take precedence over 869# this default value 870export KBUILD_IMAGE ?= vmlinux 871 872# 873# INSTALL_PATH specifies where to place the updated kernel and system map 874# images. Default is /boot, but you can set it to other values 875export INSTALL_PATH ?= /boot 876 877# 878# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 879# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 880# an argument if needed. Otherwise it defaults to the kernel install path 881# 882export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 883 884# 885# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 886# relocations required by build roots. This is not defined in the 887# makefile but the argument can be passed to make if needed. 888# 889 890MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 891export MODLIB 892 893# 894# INSTALL_MOD_STRIP, if defined, will cause modules to be 895# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 896# the default option --strip-debug will be used. Otherwise, 897# INSTALL_MOD_STRIP value will be used as the options to the strip command. 898 899ifdef INSTALL_MOD_STRIP 900ifeq ($(INSTALL_MOD_STRIP),1) 901mod_strip_cmd = $(STRIP) --strip-debug 902else 903mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 904endif # INSTALL_MOD_STRIP=1 905else 906mod_strip_cmd = true 907endif # INSTALL_MOD_STRIP 908export mod_strip_cmd 909 910# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 911# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 912# or CONFIG_MODULE_COMPRESS_XZ. 913 914mod_compress_cmd = true 915ifdef CONFIG_MODULE_COMPRESS 916 ifdef CONFIG_MODULE_COMPRESS_GZIP 917 mod_compress_cmd = gzip -n -f 918 endif # CONFIG_MODULE_COMPRESS_GZIP 919 ifdef CONFIG_MODULE_COMPRESS_XZ 920 mod_compress_cmd = xz -f 921 endif # CONFIG_MODULE_COMPRESS_XZ 922endif # CONFIG_MODULE_COMPRESS 923export mod_compress_cmd 924 925# Select initial ramdisk compression format, default is gzip(1). 926# This shall be used by the dracut(8) tool while creating an initramfs image. 927# 928INITRD_COMPRESS-y := gzip 929INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 930INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 931INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 932INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 933INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 934# do not export INITRD_COMPRESS, since we didn't actually 935# choose a sane default compression above. 936# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 937 938ifdef CONFIG_MODULE_SIG_ALL 939$(eval $(call config_filename,MODULE_SIG_KEY)) 940 941mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 942else 943mod_sign_cmd = true 944endif 945export mod_sign_cmd 946 947ifdef CONFIG_STACK_VALIDATION 948 has_libelf := $(call try-run,\ 949 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0) 950 ifeq ($(has_libelf),1) 951 objtool_target := tools/objtool FORCE 952 else 953 SKIP_STACK_VALIDATION := 1 954 export SKIP_STACK_VALIDATION 955 endif 956endif 957 958 959ifeq ($(KBUILD_EXTMOD),) 960core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 961 962vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 963 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 964 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 965 966vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 967 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-)))) 968 969init-y := $(patsubst %/, %/built-in.a, $(init-y)) 970core-y := $(patsubst %/, %/built-in.a, $(core-y)) 971drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y)) 972net-y := $(patsubst %/, %/built-in.a, $(net-y)) 973libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 974libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y))) 975virt-y := $(patsubst %/, %/built-in.a, $(virt-y)) 976 977# Externally visible symbols (used by link-vmlinux.sh) 978export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 979export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y) 980export KBUILD_VMLINUX_LIBS := $(libs-y1) 981export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 982export LDFLAGS_vmlinux 983# used by scripts/package/Makefile 984export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) 985 986vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS) 987 988# Recurse until adjust_autoksyms.sh is satisfied 989PHONY += autoksyms_recursive 990autoksyms_recursive: $(vmlinux-deps) 991ifdef CONFIG_TRIM_UNUSED_KSYMS 992 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 993 "$(MAKE) -f $(srctree)/Makefile vmlinux" 994endif 995 996# For the kernel to actually contain only the needed exported symbols, 997# we have to build modules as well to determine what those symbols are. 998# (this can be evaluated only once include/config/auto.conf has been included) 999ifdef CONFIG_TRIM_UNUSED_KSYMS 1000 KBUILD_MODULES := 1 1001endif 1002 1003autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) 1004 1005$(autoksyms_h): 1006 $(Q)mkdir -p $(dir $@) 1007 $(Q)touch $@ 1008 1009ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1010 1011# Final link of vmlinux with optional arch pass after final link 1012cmd_link-vmlinux = \ 1013 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1014 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1015 1016vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE 1017ifdef CONFIG_GDB_SCRIPTS 1018 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1019endif 1020 +$(call if_changed,link-vmlinux) 1021 1022targets := vmlinux 1023 1024# Build samples along the rest of the kernel. This needs headers_install. 1025ifdef CONFIG_SAMPLES 1026vmlinux-dirs += samples 1027samples: headers_install 1028endif 1029 1030# The actual objects are generated when descending, 1031# make sure no implicit rule kicks in 1032$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 1033 1034# Handle descending into subdirectories listed in $(vmlinux-dirs) 1035# Preset locale variables to speed up the build process. Limit locale 1036# tweaks to this spot to avoid wrong language settings when running 1037# make menuconfig etc. 1038# Error messages still appears in the original language 1039 1040PHONY += $(vmlinux-dirs) 1041$(vmlinux-dirs): prepare 1042 $(Q)$(MAKE) $(build)=$@ need-builtin=1 1043 1044filechk_kernel.release = \ 1045 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1046 1047# Store (new) KERNELRELEASE string in include/config/kernel.release 1048include/config/kernel.release: $(srctree)/Makefile FORCE 1049 $(call filechk,kernel.release) 1050 1051# Additional helpers built in scripts/ 1052# Carefully list dependencies so we do not try to build scripts twice 1053# in parallel 1054PHONY += scripts 1055scripts: scripts_basic scripts_dtc 1056 $(Q)$(MAKE) $(build)=$(@) 1057 1058# Things we need to do before we recursively start building the kernel 1059# or the modules are listed in "prepare". 1060# A multi level approach is used. prepareN is processed before prepareN-1. 1061# archprepare is used in arch Makefiles and when processed asm symlink, 1062# version.h and scripts_basic is processed / created. 1063 1064# Listed in dependency order 1065PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 1066 1067# prepare3 is used to check if we are building in a separate output directory, 1068# and if so do: 1069# 1) Check that make has not been executed in the kernel src $(srctree) 1070prepare3: include/config/kernel.release 1071ifneq ($(KBUILD_SRC),) 1072 @$(kecho) ' Using $(srctree) as source for kernel' 1073 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 1074 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 1075 echo >&2 " in the '$(srctree)' directory.";\ 1076 /bin/false; \ 1077 fi; 1078endif 1079 1080# prepare2 creates a makefile if using a separate output directory. 1081# From this point forward, .config has been reprocessed, so any rules 1082# that need to depend on updated CONFIG_* values can be checked here. 1083prepare2: prepare3 outputmakefile asm-generic 1084 1085prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h 1086 $(cmd_crmodverdir) 1087 1088archprepare: archheaders archscripts prepare1 scripts 1089 1090prepare0: archprepare 1091 $(Q)$(MAKE) $(build)=scripts/mod 1092 $(Q)$(MAKE) $(build)=. 1093 1094# All the preparing.. 1095prepare: prepare0 prepare-objtool 1096 1097# Support for using generic headers in asm-generic 1098asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj 1099 1100PHONY += asm-generic uapi-asm-generic 1101asm-generic: uapi-asm-generic 1102 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm 1103uapi-asm-generic: 1104 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm 1105 1106PHONY += prepare-objtool 1107prepare-objtool: $(objtool_target) 1108ifeq ($(SKIP_STACK_VALIDATION),1) 1109ifdef CONFIG_UNWINDER_ORC 1110 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1111 @false 1112else 1113 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 1114endif 1115endif 1116 1117# Generate some files 1118# --------------------------------------------------------------------------- 1119 1120# KERNELRELEASE can change from a few different places, meaning version.h 1121# needs to be updated, so this check is forced on all builds 1122 1123uts_len := 64 1124define filechk_utsrelease.h 1125 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1126 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1127 exit 1; \ 1128 fi; \ 1129 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\" 1130endef 1131 1132define filechk_version.h 1133 echo \#define LINUX_VERSION_CODE $(shell \ 1134 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1135 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))' 1136endef 1137 1138$(version_h): FORCE 1139 $(call filechk,version.h) 1140 $(Q)rm -f $(old_version_h) 1141 1142include/generated/utsrelease.h: include/config/kernel.release FORCE 1143 $(call filechk,utsrelease.h) 1144 1145PHONY += headerdep 1146headerdep: 1147 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1148 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1149 1150# --------------------------------------------------------------------------- 1151# Kernel headers 1152 1153#Default location for installed headers 1154export INSTALL_HDR_PATH = $(objtree)/usr 1155 1156# If we do an all arch process set dst to include/arch-$(SRCARCH) 1157hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include) 1158 1159PHONY += archheaders archscripts 1160 1161PHONY += __headers 1162__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts 1163 $(Q)$(MAKE) $(build)=scripts build_unifdef 1164 1165PHONY += headers_install_all 1166headers_install_all: 1167 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1168 1169PHONY += headers_install 1170headers_install: __headers 1171 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1172 $(error Headers not exportable for the $(SRCARCH) architecture)) 1173 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include 1174 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) 1175 1176PHONY += headers_check_all 1177headers_check_all: headers_install_all 1178 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1179 1180PHONY += headers_check 1181headers_check: headers_install 1182 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1 1183 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1 1184 1185ifdef CONFIG_HEADERS_CHECK 1186all: headers_check 1187endif 1188 1189# --------------------------------------------------------------------------- 1190# Kernel selftest 1191 1192PHONY += kselftest 1193kselftest: 1194 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1195 1196PHONY += kselftest-clean 1197kselftest-clean: 1198 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean 1199 1200PHONY += kselftest-merge 1201kselftest-merge: 1202 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1203 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \ 1204 -m $(objtree)/.config \ 1205 $(srctree)/tools/testing/selftests/*/config 1206 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1207 1208# --------------------------------------------------------------------------- 1209# Devicetree files 1210 1211ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) 1212dtstree := arch/$(SRCARCH)/boot/dts 1213endif 1214 1215ifneq ($(dtstree),) 1216 1217%.dtb: prepare3 scripts_dtc 1218 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ 1219 1220PHONY += dtbs dtbs_install dt_binding_check 1221dtbs dtbs_check: prepare3 scripts_dtc 1222 $(Q)$(MAKE) $(build)=$(dtstree) 1223 1224dtbs_check: export CHECK_DTBS=1 1225dtbs_check: dt_binding_check 1226 1227dtbs_install: 1228 $(Q)$(MAKE) $(dtbinst)=$(dtstree) 1229 1230ifdef CONFIG_OF_EARLY_FLATTREE 1231all: dtbs 1232endif 1233 1234endif 1235 1236PHONY += scripts_dtc 1237scripts_dtc: scripts_basic 1238 $(Q)$(MAKE) $(build)=scripts/dtc 1239 1240dt_binding_check: scripts_dtc 1241 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings 1242 1243# --------------------------------------------------------------------------- 1244# Modules 1245 1246ifdef CONFIG_MODULES 1247 1248# By default, build modules as well 1249 1250all: modules 1251 1252# Build modules 1253# 1254# A module can be listed more than once in obj-m resulting in 1255# duplicate lines in modules.order files. Those are removed 1256# using awk while concatenating to the final file. 1257 1258PHONY += modules 1259modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1260 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1261 @$(kecho) ' Building modules, stage 2.'; 1262 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1263 1264modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1265 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1266 1267%/modules.builtin: include/config/auto.conf include/config/tristate.conf 1268 $(Q)$(MAKE) $(modbuiltin)=$* 1269 1270 1271# Target to prepare building external modules 1272PHONY += modules_prepare 1273modules_prepare: prepare 1274 1275# Target to install modules 1276PHONY += modules_install 1277modules_install: _modinst_ _modinst_post 1278 1279PHONY += _modinst_ 1280_modinst_: 1281 @rm -rf $(MODLIB)/kernel 1282 @rm -f $(MODLIB)/source 1283 @mkdir -p $(MODLIB)/kernel 1284 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1285 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1286 rm -f $(MODLIB)/build ; \ 1287 ln -s $(CURDIR) $(MODLIB)/build ; \ 1288 fi 1289 @cp -f $(objtree)/modules.order $(MODLIB)/ 1290 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1291 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1292 1293# This depmod is only for convenience to give the initial 1294# boot a modules.dep even before / is mounted read-write. However the 1295# boot script depmod is the master version. 1296PHONY += _modinst_post 1297_modinst_post: _modinst_ 1298 $(call cmd,depmod) 1299 1300ifeq ($(CONFIG_MODULE_SIG), y) 1301PHONY += modules_sign 1302modules_sign: 1303 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1304endif 1305 1306else # CONFIG_MODULES 1307 1308# Modules not configured 1309# --------------------------------------------------------------------------- 1310 1311PHONY += modules modules_install 1312modules modules_install: 1313 @echo >&2 1314 @echo >&2 "The present kernel configuration has modules disabled." 1315 @echo >&2 "Type 'make config' and enable loadable module support." 1316 @echo >&2 "Then build a kernel with module support enabled." 1317 @echo >&2 1318 @exit 1 1319 1320endif # CONFIG_MODULES 1321 1322### 1323# Cleaning is done on three levels. 1324# make clean Delete most generated files 1325# Leave enough to build external modules 1326# make mrproper Delete the current configuration, and all generated files 1327# make distclean Remove editor backup files, patch leftover files and the like 1328 1329# Directories & files removed with 'make clean' 1330CLEAN_DIRS += $(MODVERDIR) include/ksym 1331 1332# Directories & files removed with 'make mrproper' 1333MRPROPER_DIRS += include/config usr/include include/generated \ 1334 arch/*/include/generated .tmp_objdiff 1335MRPROPER_FILES += .config .config.old .version \ 1336 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1337 signing_key.pem signing_key.priv signing_key.x509 \ 1338 x509.genkey extra_certificates signing_key.x509.keyid \ 1339 signing_key.x509.signer vmlinux-gdb.py 1340 1341# clean - Delete most, but leave enough to build external modules 1342# 1343clean: rm-dirs := $(CLEAN_DIRS) 1344clean: rm-files := $(CLEAN_FILES) 1345clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1346 1347PHONY += $(clean-dirs) clean archclean vmlinuxclean 1348$(clean-dirs): 1349 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1350 1351vmlinuxclean: 1352 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1353 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1354 1355clean: archclean vmlinuxclean 1356 1357# mrproper - Delete all generated files, including .config 1358# 1359mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1360mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1361mrproper-dirs := $(addprefix _mrproper_,scripts) 1362 1363PHONY += $(mrproper-dirs) mrproper archmrproper 1364$(mrproper-dirs): 1365 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1366 1367mrproper: clean archmrproper $(mrproper-dirs) 1368 $(call cmd,rmdirs) 1369 $(call cmd,rmfiles) 1370 1371# distclean 1372# 1373PHONY += distclean 1374 1375distclean: mrproper 1376 @find $(srctree) $(RCS_FIND_IGNORE) \ 1377 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1378 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1379 -o -name 'core' \) \ 1380 -type f -print | xargs rm -f 1381 1382 1383# Packaging of the kernel to various formats 1384# --------------------------------------------------------------------------- 1385package-dir := scripts/package 1386 1387%src-pkg: FORCE 1388 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1389%pkg: include/config/kernel.release FORCE 1390 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1391 1392 1393# Brief documentation of the typical targets used 1394# --------------------------------------------------------------------------- 1395 1396boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1397boards := $(sort $(notdir $(boards))) 1398board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1399board-dirs := $(sort $(notdir $(board-dirs:/=))) 1400 1401PHONY += help 1402help: 1403 @echo 'Cleaning targets:' 1404 @echo ' clean - Remove most generated files but keep the config and' 1405 @echo ' enough build support to build external modules' 1406 @echo ' mrproper - Remove all generated files + config + various backup files' 1407 @echo ' distclean - mrproper + remove editor backup and patch files' 1408 @echo '' 1409 @echo 'Configuration targets:' 1410 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1411 @echo '' 1412 @echo 'Other generic targets:' 1413 @echo ' all - Build all targets marked with [*]' 1414 @echo '* vmlinux - Build the bare kernel' 1415 @echo '* modules - Build all modules' 1416 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1417 @echo ' dir/ - Build all files in dir and below' 1418 @echo ' dir/file.[ois] - Build specified target only' 1419 @echo ' dir/file.ll - Build the LLVM assembly file' 1420 @echo ' (requires compiler support for LLVM assembly generation)' 1421 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1422 @echo ' (requires a recent binutils and recent build (System.map))' 1423 @echo ' dir/file.ko - Build module including final link' 1424 @echo ' modules_prepare - Set up for building external modules' 1425 @echo ' tags/TAGS - Generate tags file for editors' 1426 @echo ' cscope - Generate cscope index' 1427 @echo ' gtags - Generate GNU GLOBAL index' 1428 @echo ' kernelrelease - Output the release version string (use with make -s)' 1429 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1430 @echo ' image_name - Output the image name (use with make -s)' 1431 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1432 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1433 echo '' 1434 @echo 'Static analysers:' 1435 @echo ' checkstack - Generate a list of stack hogs' 1436 @echo ' namespacecheck - Name space analysis on compiled kernel' 1437 @echo ' versioncheck - Sanity check on version.h usage' 1438 @echo ' includecheck - Check for duplicate included header files' 1439 @echo ' export_report - List the usages of all exported symbols' 1440 @echo ' headers_check - Sanity check on exported headers' 1441 @echo ' headerdep - Detect inclusion cycles in headers' 1442 @echo ' coccicheck - Check with Coccinelle' 1443 @echo '' 1444 @echo 'Kernel selftest:' 1445 @echo ' kselftest - Build and run kernel selftest (run as root)' 1446 @echo ' Build, install, and boot kernel before' 1447 @echo ' running kselftest on it' 1448 @echo ' kselftest-clean - Remove all generated kselftest files' 1449 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' 1450 @echo ' .config.' 1451 @echo '' 1452 @$(if $(dtstree), \ 1453 echo 'Devicetree:'; \ 1454 echo '* dtbs - Build device tree blobs for enabled boards'; \ 1455 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ 1456 echo '') 1457 1458 @echo 'Userspace tools targets:' 1459 @echo ' use "make tools/help"' 1460 @echo ' or "cd tools; make help"' 1461 @echo '' 1462 @echo 'Kernel packaging:' 1463 @$(MAKE) $(build)=$(package-dir) help 1464 @echo '' 1465 @echo 'Documentation targets:' 1466 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1467 @echo '' 1468 @echo 'Architecture specific targets ($(SRCARCH)):' 1469 @$(if $(archhelp),$(archhelp),\ 1470 echo ' No architecture specific help defined for $(SRCARCH)') 1471 @echo '' 1472 @$(if $(boards), \ 1473 $(foreach b, $(boards), \ 1474 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1475 echo '') 1476 @$(if $(board-dirs), \ 1477 $(foreach b, $(board-dirs), \ 1478 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1479 printf " %-16s - Show all of the above\\n" help-boards; \ 1480 echo '') 1481 1482 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1483 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1484 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1485 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' 1486 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1487 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1488 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1489 @echo ' 1: warnings which may be relevant and do not occur too often' 1490 @echo ' 2: warnings which occur quite often but may still be relevant' 1491 @echo ' 3: more obscure warnings, can most likely be ignored' 1492 @echo ' Multiple levels can be combined with W=12 or W=123' 1493 @echo '' 1494 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1495 @echo 'For further info see the ./README file' 1496 1497 1498help-board-dirs := $(addprefix help-,$(board-dirs)) 1499 1500help-boards: $(help-board-dirs) 1501 1502boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1503 1504$(help-board-dirs): help-%: 1505 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1506 @$(if $(boards-per-dir), \ 1507 $(foreach b, $(boards-per-dir), \ 1508 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1509 echo '') 1510 1511 1512# Documentation targets 1513# --------------------------------------------------------------------------- 1514DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1515 linkcheckdocs dochelp refcheckdocs 1516PHONY += $(DOC_TARGETS) 1517$(DOC_TARGETS): scripts_basic FORCE 1518 $(Q)$(MAKE) $(build)=Documentation $@ 1519 1520else # KBUILD_EXTMOD 1521 1522### 1523# External module support. 1524# When building external modules the kernel used as basis is considered 1525# read-only, and no consistency checks are made and the make 1526# system is not used on the basis kernel. If updates are required 1527# in the basis kernel ordinary make commands (without M=...) must 1528# be used. 1529# 1530# The following are the only valid targets when building external 1531# modules. 1532# make M=dir clean Delete all automatically generated files 1533# make M=dir modules Make all modules in specified dir 1534# make M=dir Same as 'make M=dir modules' 1535# make M=dir modules_install 1536# Install the modules built in the module directory 1537# Assumes install directory is already created 1538 1539# We are always building modules 1540KBUILD_MODULES := 1 1541 1542PHONY += $(objtree)/Module.symvers 1543$(objtree)/Module.symvers: 1544 @test -e $(objtree)/Module.symvers || ( \ 1545 echo; \ 1546 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1547 echo " is missing; modules will have no dependencies and modversions."; \ 1548 echo ) 1549 1550module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1551PHONY += $(module-dirs) modules 1552$(module-dirs): prepare $(objtree)/Module.symvers 1553 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1554 1555modules: $(module-dirs) 1556 @$(kecho) ' Building modules, stage 2.'; 1557 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1558 1559PHONY += modules_install 1560modules_install: _emodinst_ _emodinst_post 1561 1562install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1563PHONY += _emodinst_ 1564_emodinst_: 1565 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1566 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1567 1568PHONY += _emodinst_post 1569_emodinst_post: _emodinst_ 1570 $(call cmd,depmod) 1571 1572clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1573 1574PHONY += $(clean-dirs) clean 1575$(clean-dirs): 1576 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1577 1578clean: rm-dirs := $(MODVERDIR) 1579clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1580 1581PHONY += help 1582help: 1583 @echo ' Building external modules.' 1584 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1585 @echo '' 1586 @echo ' modules - default target, build the module(s)' 1587 @echo ' modules_install - install the module' 1588 @echo ' clean - remove generated files in module directory only' 1589 @echo '' 1590 1591PHONY += prepare 1592prepare: 1593 $(cmd_crmodverdir) 1594endif # KBUILD_EXTMOD 1595 1596clean: $(clean-dirs) 1597 $(call cmd,rmdirs) 1598 $(call cmd,rmfiles) 1599 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1600 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1601 -o -name '*.ko.*' \ 1602 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ 1603 -o -name '*.dwo' -o -name '*.lst' \ 1604 -o -name '*.su' \ 1605 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1606 -o -name '*.lex.c' -o -name '*.tab.[ch]' \ 1607 -o -name '*.asn1.[ch]' \ 1608 -o -name '*.symtypes' -o -name 'modules.order' \ 1609 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1610 -o -name '*.c.[012]*.*' \ 1611 -o -name '*.ll' \ 1612 -o -name '*.gcno' \) -type f -print | xargs rm -f 1613 1614# Generate tags for editors 1615# --------------------------------------------------------------------------- 1616quiet_cmd_tags = GEN $@ 1617 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1618 1619tags TAGS cscope gtags: FORCE 1620 $(call cmd,tags) 1621 1622# Scripts to check various things for consistency 1623# --------------------------------------------------------------------------- 1624 1625PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1626 1627includecheck: 1628 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1629 -name '*.[hcS]' -type f -print | sort \ 1630 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1631 1632versioncheck: 1633 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1634 -name '*.[hcS]' -type f -print | sort \ 1635 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1636 1637coccicheck: 1638 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1639 1640namespacecheck: 1641 $(PERL) $(srctree)/scripts/namespace.pl 1642 1643export_report: 1644 $(PERL) $(srctree)/scripts/export_report.pl 1645 1646PHONY += checkstack kernelrelease kernelversion image_name 1647 1648# UML needs a little special treatment here. It wants to use the host 1649# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1650# else wants $(ARCH), including people doing cross-builds, which means 1651# that $(SUBARCH) doesn't work here. 1652ifeq ($(ARCH), um) 1653CHECKSTACK_ARCH := $(SUBARCH) 1654else 1655CHECKSTACK_ARCH := $(ARCH) 1656endif 1657checkstack: 1658 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1659 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1660 1661kernelrelease: 1662 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1663 1664kernelversion: 1665 @echo $(KERNELVERSION) 1666 1667image_name: 1668 @echo $(KBUILD_IMAGE) 1669 1670# Clear a bunch of variables before executing the submake 1671tools/: FORCE 1672 $(Q)mkdir -p $(objtree)/tools 1673 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ 1674 1675tools/%: FORCE 1676 $(Q)mkdir -p $(objtree)/tools 1677 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $* 1678 1679# Single targets 1680# --------------------------------------------------------------------------- 1681# Single targets are compatible with: 1682# - build with mixed source and output 1683# - build with separate output dir 'make O=...' 1684# - external modules 1685# 1686# target-dir => where to store outputfile 1687# build-dir => directory in kernel source tree to use 1688 1689ifeq ($(KBUILD_EXTMOD),) 1690 build-dir = $(patsubst %/,%,$(dir $@)) 1691 target-dir = $(dir $@) 1692else 1693 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1694 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1695 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1696endif 1697 1698%.s: %.c prepare FORCE 1699 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1700%.i: %.c prepare FORCE 1701 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1702%.o: %.c prepare FORCE 1703 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1704%.lst: %.c prepare FORCE 1705 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1706%.s: %.S prepare FORCE 1707 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1708%.o: %.S prepare FORCE 1709 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1710%.symtypes: %.c prepare FORCE 1711 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1712%.ll: %.c prepare FORCE 1713 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1714 1715# Modules 1716/: prepare FORCE 1717 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1718 $(build)=$(build-dir) 1719# Make sure the latest headers are built for Documentation 1720Documentation/ samples/: headers_install 1721%/: prepare FORCE 1722 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1723 $(build)=$(build-dir) 1724%.ko: prepare FORCE 1725 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1726 $(build)=$(build-dir) $(@:.ko=.o) 1727 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1728 1729# FIXME Should go into a make.lib or something 1730# =========================================================================== 1731 1732quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1733 cmd_rmdirs = rm -rf $(rm-dirs) 1734 1735quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1736 cmd_rmfiles = rm -f $(rm-files) 1737 1738# Run depmod only if we have System.map and depmod is executable 1739quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1740 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1741 $(KERNELRELEASE) 1742 1743# Create temporary dir for module support files 1744# clean it up only when building all modules 1745cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1746 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1747 1748# read saved command lines for existing targets 1749existing-targets := $(wildcard $(sort $(targets))) 1750 1751cmd_files := $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 1752$(cmd_files): ; # Do not try to update included dependency files 1753-include $(cmd_files) 1754 1755endif # ifeq ($(config-targets),1) 1756endif # ifeq ($(mixed-targets),1) 1757endif # skip-makefile 1758 1759PHONY += FORCE 1760FORCE: 1761 1762# Declare the contents of the PHONY variable as phony. We keep that 1763# information in a variable so we can use it in if_changed and friends. 1764.PHONY: $(PHONY) 1765