1# SPDX-License-Identifier: GPL-2.0 2VERSION = 4 3PATCHLEVEL = 16 4SUBLEVEL = 0 5EXTRAVERSION = -rc4 6NAME = Fearless Coyote 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# o Do not use make's built-in rules and variables 19# (this increases performance and avoids hard-to-debug behaviour); 20# o Look for make include files relative to root of kernel src 21MAKEFLAGS += -rR --include-dir=$(CURDIR) 22 23# Avoid funny character set dependencies 24unexport LC_ALL 25LC_COLLATE=C 26LC_NUMERIC=C 27export LC_COLLATE LC_NUMERIC 28 29# Avoid interference with shell env settings 30unexport GREP_OPTIONS 31 32# We are using a recursive build, so we need to do a little thinking 33# to get the ordering right. 34# 35# Most importantly: sub-Makefiles should only ever modify files in 36# their own directory. If in some directory we have a dependency on 37# a file in another dir (which doesn't happen often, but it's often 38# unavoidable when linking the built-in.o targets which finally 39# turn into vmlinux), we will call a sub make in that other dir, and 40# after that we are sure that everything which is in that other dir 41# is now up to date. 42# 43# The only cases where we need to modify files which have global 44# effects are thus separated out and done before the recursive 45# descending is started. They are now explicitly listed as the 46# prepare rule. 47 48# Beautify output 49# --------------------------------------------------------------------------- 50# 51# Normally, we echo the whole command before executing it. By making 52# that echo $($(quiet)$(cmd)), we now have the possibility to set 53# $(quiet) to choose other forms of output instead, e.g. 54# 55# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 56# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 57# 58# If $(quiet) is empty, the whole command will be printed. 59# If it is set to "quiet_", only the short version will be printed. 60# If it is set to "silent_", nothing will be printed at all, since 61# the variable $(silent_cmd_cc_o_c) doesn't exist. 62# 63# A simple variant is to prefix commands with $(Q) - that's useful 64# for commands that shall be hidden in non-verbose mode. 65# 66# $(Q)ln $@ :< 67# 68# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 69# If KBUILD_VERBOSE equals 1 then the above command is displayed. 70# 71# To put more focus on warnings, be less verbose as default 72# Use 'make V=1' to see the full commands 73 74ifeq ("$(origin V)", "command line") 75 KBUILD_VERBOSE = $(V) 76endif 77ifndef KBUILD_VERBOSE 78 KBUILD_VERBOSE = 0 79endif 80 81ifeq ($(KBUILD_VERBOSE),1) 82 quiet = 83 Q = 84else 85 quiet=quiet_ 86 Q = @ 87endif 88 89# If the user is running make -s (silent mode), suppress echoing of 90# commands 91 92ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 93 quiet=silent_ 94 tools_silent=s 95endif 96 97export quiet Q KBUILD_VERBOSE 98 99# kbuild supports saving output files in a separate directory. 100# To locate output files in a separate directory two syntaxes are supported. 101# In both cases the working directory must be the root of the kernel src. 102# 1) O= 103# Use "make O=dir/to/store/output/files/" 104# 105# 2) Set KBUILD_OUTPUT 106# Set the environment variable KBUILD_OUTPUT to point to the directory 107# where the output files shall be placed. 108# export KBUILD_OUTPUT=dir/to/store/output/files/ 109# make 110# 111# The O= assignment takes precedence over the KBUILD_OUTPUT environment 112# variable. 113 114# KBUILD_SRC is not intended to be used by the regular user (for now), 115# it is set on invocation of make with KBUILD_OUTPUT or O= specified. 116ifeq ($(KBUILD_SRC),) 117 118# OK, Make called in directory where kernel src resides 119# Do we want to locate output files in a separate directory? 120ifeq ("$(origin O)", "command line") 121 KBUILD_OUTPUT := $(O) 122endif 123 124# Cancel implicit rules on top Makefile 125$(CURDIR)/Makefile Makefile: ; 126 127ifneq ($(words $(subst :, ,$(CURDIR))), 1) 128 $(error main directory cannot contain spaces nor colons) 129endif 130 131ifneq ($(KBUILD_OUTPUT),) 132# check that the output directory actually exists 133saved-output := $(KBUILD_OUTPUT) 134KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \ 135 && pwd) 136$(if $(KBUILD_OUTPUT),, \ 137 $(error failed to create output directory "$(saved-output)")) 138 139PHONY += $(MAKECMDGOALS) sub-make 140 141$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make 142 @: 143 144# Invoke a second make in the output directory, passing relevant variables 145sub-make: 146 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \ 147 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS)) 148 149# Leave processing to above invocation of make 150skip-makefile := 1 151endif # ifneq ($(KBUILD_OUTPUT),) 152endif # ifeq ($(KBUILD_SRC),) 153 154# We process the rest of the Makefile if this is the final invocation of make 155ifeq ($(skip-makefile),) 156 157# Do not print "Entering directory ...", 158# but we want to display it when entering to the output directory 159# so that IDEs/editors are able to understand relative filenames. 160MAKEFLAGS += --no-print-directory 161 162# Call a source code checker (by default, "sparse") as part of the 163# C compilation. 164# 165# Use 'make C=1' to enable checking of only re-compiled files. 166# Use 'make C=2' to enable checking of *all* source files, regardless 167# of whether they are re-compiled or not. 168# 169# See the file "Documentation/dev-tools/sparse.rst" for more details, 170# including where to get the "sparse" utility. 171 172ifeq ("$(origin C)", "command line") 173 KBUILD_CHECKSRC = $(C) 174endif 175ifndef KBUILD_CHECKSRC 176 KBUILD_CHECKSRC = 0 177endif 178 179# Use make M=dir to specify directory of external module to build 180# Old syntax make ... SUBDIRS=$PWD is still supported 181# Setting the environment variable KBUILD_EXTMOD take precedence 182ifdef SUBDIRS 183 KBUILD_EXTMOD ?= $(SUBDIRS) 184endif 185 186ifeq ("$(origin M)", "command line") 187 KBUILD_EXTMOD := $(M) 188endif 189 190ifeq ($(KBUILD_SRC),) 191 # building in the source tree 192 srctree := . 193else 194 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR))) 195 # building in a subdirectory of the source tree 196 srctree := .. 197 else 198 srctree := $(KBUILD_SRC) 199 endif 200endif 201 202export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC 203 204objtree := . 205src := $(srctree) 206obj := $(objtree) 207 208VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD)) 209 210export srctree objtree VPATH 211 212# To make sure we do not include .config for any of the *config targets 213# catch them early, and hand them over to scripts/kconfig/Makefile 214# It is allowed to specify more targets when calling make, including 215# mixing *config targets and build targets. 216# For example 'make oldconfig all'. 217# Detect when mixed targets is specified, and make a second invocation 218# of make so .config is not included in this case either (for *config). 219 220version_h := include/generated/uapi/linux/version.h 221old_version_h := include/linux/version.h 222 223no-dot-config-targets := clean mrproper distclean \ 224 cscope gtags TAGS tags help% %docs check% coccicheck \ 225 $(version_h) headers_% archheaders archscripts \ 226 kernelversion %src-pkg 227 228config-targets := 0 229mixed-targets := 0 230dot-config := 1 231 232ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 233 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 234 dot-config := 0 235 endif 236endif 237 238ifeq ($(KBUILD_EXTMOD),) 239 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 240 config-targets := 1 241 ifneq ($(words $(MAKECMDGOALS)),1) 242 mixed-targets := 1 243 endif 244 endif 245endif 246# install and modules_install need also be processed one by one 247ifneq ($(filter install,$(MAKECMDGOALS)),) 248 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 249 mixed-targets := 1 250 endif 251endif 252 253ifeq ($(mixed-targets),1) 254# =========================================================================== 255# We're called with mixed targets (*config and build targets). 256# Handle them one by one. 257 258PHONY += $(MAKECMDGOALS) __build_one_by_one 259 260$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 261 @: 262 263__build_one_by_one: 264 $(Q)set -e; \ 265 for i in $(MAKECMDGOALS); do \ 266 $(MAKE) -f $(srctree)/Makefile $$i; \ 267 done 268 269else 270 271# We need some generic definitions (do not try to remake the file). 272scripts/Kbuild.include: ; 273include scripts/Kbuild.include 274 275# Read KERNELRELEASE from include/config/kernel.release (if it exists) 276KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 277KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 278export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 279 280# SUBARCH tells the usermode build what the underlying arch is. That is set 281# first, and if a usermode build is happening, the "ARCH=um" on the command 282# line overrides the setting of ARCH below. If a native build is happening, 283# then ARCH is assigned, getting whatever value it gets normally, and 284# SUBARCH is subsequently ignored. 285 286SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \ 287 -e s/sun4u/sparc64/ \ 288 -e s/arm.*/arm/ -e s/sa110/arm/ \ 289 -e s/s390x/s390/ -e s/parisc64/parisc/ \ 290 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \ 291 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \ 292 -e s/riscv.*/riscv/) 293 294# Cross compiling and selecting different set of gcc/bin-utils 295# --------------------------------------------------------------------------- 296# 297# When performing cross compilation for other architectures ARCH shall be set 298# to the target architecture. (See arch/* for the possibilities). 299# ARCH can be set during invocation of make: 300# make ARCH=ia64 301# Another way is to have ARCH set in the environment. 302# The default ARCH is the host where make is executed. 303 304# CROSS_COMPILE specify the prefix used for all executables used 305# during compilation. Only gcc and related bin-utils executables 306# are prefixed with $(CROSS_COMPILE). 307# CROSS_COMPILE can be set on the command line 308# make CROSS_COMPILE=ia64-linux- 309# Alternatively CROSS_COMPILE can be set in the environment. 310# A third alternative is to store a setting in .config so that plain 311# "make" in the configured kernel build directory always uses that. 312# Default value for CROSS_COMPILE is not to prefix executables 313# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 314ARCH ?= $(SUBARCH) 315CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%) 316 317# Architecture as present in compile.h 318UTS_MACHINE := $(ARCH) 319SRCARCH := $(ARCH) 320 321# Additional ARCH settings for x86 322ifeq ($(ARCH),i386) 323 SRCARCH := x86 324endif 325ifeq ($(ARCH),x86_64) 326 SRCARCH := x86 327endif 328 329# Additional ARCH settings for sparc 330ifeq ($(ARCH),sparc32) 331 SRCARCH := sparc 332endif 333ifeq ($(ARCH),sparc64) 334 SRCARCH := sparc 335endif 336 337# Additional ARCH settings for sh 338ifeq ($(ARCH),sh64) 339 SRCARCH := sh 340endif 341 342KCONFIG_CONFIG ?= .config 343export KCONFIG_CONFIG 344 345# SHELL used by kbuild 346CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 347 else if [ -x /bin/bash ]; then echo /bin/bash; \ 348 else echo sh; fi ; fi) 349 350HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS) 351HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS) 352HOST_LFS_LIBS := $(shell getconf LFS_LIBS) 353 354HOSTCC = gcc 355HOSTCXX = g++ 356HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \ 357 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) 358HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) 359HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) 360HOST_LOADLIBES := $(HOST_LFS_LIBS) 361 362# Make variables (CC, etc...) 363AS = $(CROSS_COMPILE)as 364LD = $(CROSS_COMPILE)ld 365CC = $(CROSS_COMPILE)gcc 366CPP = $(CC) -E 367AR = $(CROSS_COMPILE)ar 368NM = $(CROSS_COMPILE)nm 369STRIP = $(CROSS_COMPILE)strip 370OBJCOPY = $(CROSS_COMPILE)objcopy 371OBJDUMP = $(CROSS_COMPILE)objdump 372LEX = flex 373YACC = bison 374AWK = awk 375GENKSYMS = scripts/genksyms/genksyms 376INSTALLKERNEL := installkernel 377DEPMOD = /sbin/depmod 378PERL = perl 379PYTHON = python 380CHECK = sparse 381 382CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 383 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) 384NOSTDINC_FLAGS = 385CFLAGS_MODULE = 386AFLAGS_MODULE = 387LDFLAGS_MODULE = 388CFLAGS_KERNEL = 389AFLAGS_KERNEL = 390LDFLAGS_vmlinux = 391 392# Use USERINCLUDE when you must reference the UAPI directories only. 393USERINCLUDE := \ 394 -I$(srctree)/arch/$(SRCARCH)/include/uapi \ 395 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ 396 -I$(srctree)/include/uapi \ 397 -I$(objtree)/include/generated/uapi \ 398 -include $(srctree)/include/linux/kconfig.h 399 400# Use LINUXINCLUDE when you must reference the include/ directory. 401# Needed to be compatible with the O= option 402LINUXINCLUDE := \ 403 -I$(srctree)/arch/$(SRCARCH)/include \ 404 -I$(objtree)/arch/$(SRCARCH)/include/generated \ 405 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 406 -I$(objtree)/include \ 407 $(USERINCLUDE) 408 409KBUILD_AFLAGS := -D__ASSEMBLY__ 410KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 411 -fno-strict-aliasing -fno-common -fshort-wchar \ 412 -Werror-implicit-function-declaration \ 413 -Wno-format-security \ 414 -std=gnu89 415KBUILD_CPPFLAGS := -D__KERNEL__ 416KBUILD_AFLAGS_KERNEL := 417KBUILD_CFLAGS_KERNEL := 418KBUILD_AFLAGS_MODULE := -DMODULE 419KBUILD_CFLAGS_MODULE := -DMODULE 420KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 421GCC_PLUGINS_CFLAGS := 422 423export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC 424export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES 425export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE 426export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 427 428export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 429export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 430export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN 431export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 432export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 433export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 434export KBUILD_ARFLAGS 435 436# When compiling out-of-tree modules, put MODVERDIR in the module 437# tree rather than in the kernel tree. The kernel tree might 438# even be read-only. 439export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 440 441# Files to ignore in find ... statements 442 443export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 444 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 445 -prune -o 446export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 447 --exclude CVS --exclude .pc --exclude .hg --exclude .git 448 449# =========================================================================== 450# Rules shared between *config targets and build targets 451 452# Basic helpers built in scripts/basic/ 453PHONY += scripts_basic 454scripts_basic: 455 $(Q)$(MAKE) $(build)=scripts/basic 456 $(Q)rm -f .tmp_quiet_recordmcount 457 458# To avoid any implicit rule to kick in, define an empty command. 459scripts/basic/%: scripts_basic ; 460 461PHONY += outputmakefile 462# outputmakefile generates a Makefile in the output directory, if using a 463# separate output directory. This allows convenient use of make in the 464# output directory. 465outputmakefile: 466ifneq ($(KBUILD_SRC),) 467 $(Q)ln -fsn $(srctree) source 468 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 469 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 470endif 471 472ifeq ($(cc-name),clang) 473ifneq ($(CROSS_COMPILE),) 474CLANG_TARGET := --target=$(notdir $(CROSS_COMPILE:%-=%)) 475GCC_TOOLCHAIN := $(realpath $(dir $(shell which $(LD)))/..) 476endif 477ifneq ($(GCC_TOOLCHAIN),) 478CLANG_GCC_TC := --gcc-toolchain=$(GCC_TOOLCHAIN) 479endif 480KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 481KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 482endif 483 484RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register 485RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk 486RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) 487export RETPOLINE_CFLAGS 488 489ifeq ($(config-targets),1) 490# =========================================================================== 491# *config targets only - make sure prerequisites are updated, and descend 492# in scripts/kconfig to make the *config target 493 494# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 495# KBUILD_DEFCONFIG may point out an alternative default configuration 496# used for 'make defconfig' 497include arch/$(SRCARCH)/Makefile 498export KBUILD_DEFCONFIG KBUILD_KCONFIG 499 500config: scripts_basic outputmakefile FORCE 501 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 502 503%config: scripts_basic outputmakefile FORCE 504 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 505 506else 507# =========================================================================== 508# Build targets only - this includes vmlinux, arch specific targets, clean 509# targets and others. In general all targets except *config targets. 510 511# If building an external module we do not care about the all: rule 512# but instead _all depend on modules 513PHONY += all 514ifeq ($(KBUILD_EXTMOD),) 515_all: all 516else 517_all: modules 518endif 519 520# Decide whether to build built-in, modular, or both. 521# Normally, just do built-in. 522 523KBUILD_MODULES := 524KBUILD_BUILTIN := 1 525 526# If we have only "make modules", don't compile built-in objects. 527# When we're building modules with modversions, we need to consider 528# the built-in objects during the descend as well, in order to 529# make sure the checksums are up to date before we record them. 530 531ifeq ($(MAKECMDGOALS),modules) 532 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 533endif 534 535# If we have "make <whatever> modules", compile modules 536# in addition to whatever we do anyway. 537# Just "make" or "make all" shall build modules as well 538 539ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 540 KBUILD_MODULES := 1 541endif 542 543ifeq ($(MAKECMDGOALS),) 544 KBUILD_MODULES := 1 545endif 546 547export KBUILD_MODULES KBUILD_BUILTIN 548 549ifeq ($(KBUILD_EXTMOD),) 550# Additional helpers built in scripts/ 551# Carefully list dependencies so we do not try to build scripts twice 552# in parallel 553PHONY += scripts 554scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \ 555 asm-generic gcc-plugins 556 $(Q)$(MAKE) $(build)=$(@) 557 558# Objects we will link into vmlinux / subdirs we need to visit 559init-y := init/ 560drivers-y := drivers/ sound/ firmware/ 561net-y := net/ 562libs-y := lib/ 563core-y := usr/ 564virt-y := virt/ 565endif # KBUILD_EXTMOD 566 567ifeq ($(dot-config),1) 568# Read in config 569-include include/config/auto.conf 570 571ifeq ($(KBUILD_EXTMOD),) 572# Read in dependencies to all Kconfig* files, make sure to run 573# oldconfig if changes are detected. 574-include include/config/auto.conf.cmd 575 576# To avoid any implicit rule to kick in, define an empty command 577$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 578 579# The actual configuration files used during the build are stored in 580# include/generated/ and include/config/. Update them if .config is newer than 581# include/config/auto.conf (which mirrors .config). 582include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 583 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 584else 585# external modules needs include/generated/autoconf.h and include/config/auto.conf 586# but do not care if they are up-to-date. Use auto.conf to trigger the test 587PHONY += include/config/auto.conf 588 589include/config/auto.conf: 590 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 591 echo >&2; \ 592 echo >&2 " ERROR: Kernel configuration is invalid."; \ 593 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 594 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 595 echo >&2 ; \ 596 /bin/false) 597 598endif # KBUILD_EXTMOD 599 600else 601# Dummy target needed, because used as prerequisite 602include/config/auto.conf: ; 603endif # $(dot-config) 604 605# For the kernel to actually contain only the needed exported symbols, 606# we have to build modules as well to determine what those symbols are. 607# (this can be evaluated only once include/config/auto.conf has been included) 608ifdef CONFIG_TRIM_UNUSED_KSYMS 609 KBUILD_MODULES := 1 610endif 611 612# The all: target is the default when no target is given on the 613# command line. 614# This allow a user to issue only 'make' to build a kernel including modules 615# Defaults to vmlinux, but the arch makefile usually adds further targets 616all: vmlinux 617 618KBUILD_CFLAGS += $(call cc-option,-fno-PIE) 619KBUILD_AFLAGS += $(call cc-option,-fno-PIE) 620CFLAGS_GCOV := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,) 621export CFLAGS_GCOV CFLAGS_KCOV 622 623# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 624# values of the respective KBUILD_* variables 625ARCH_CPPFLAGS := 626ARCH_AFLAGS := 627ARCH_CFLAGS := 628include arch/$(SRCARCH)/Makefile 629 630KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 631KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 632KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) 633KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) 634KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context) 635 636ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 637KBUILD_CFLAGS += $(call cc-option,-Oz,-Os) 638KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,) 639else 640ifdef CONFIG_PROFILE_ALL_BRANCHES 641KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,) 642else 643KBUILD_CFLAGS += -O2 644endif 645endif 646 647KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \ 648 $(call cc-disable-warning,maybe-uninitialized,)) 649 650# Tell gcc to never replace conditional load with a non-conditional one 651KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 652 653# check for 'asm goto' 654ifeq ($(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y) 655 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 656 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO 657endif 658 659include scripts/Makefile.kcov 660include scripts/Makefile.gcc-plugins 661 662ifdef CONFIG_READABLE_ASM 663# Disable optimizations that make assembler listings hard to read. 664# reorder blocks reorders the control in the function 665# ipa clone creates specialized cloned functions 666# partial inlining inlines only parts of functions 667KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 668 $(call cc-option,-fno-ipa-cp-clone,) \ 669 $(call cc-option,-fno-partial-inlining) 670endif 671 672ifneq ($(CONFIG_FRAME_WARN),0) 673KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 674endif 675 676# This selects the stack protector compiler flag. Testing it is delayed 677# until after .config has been reprocessed, in the prepare-compiler-check 678# target. 679ifdef CONFIG_CC_STACKPROTECTOR_AUTO 680 stackp-flag := $(call cc-option,-fstack-protector-strong,$(call cc-option,-fstack-protector)) 681 stackp-name := AUTO 682else 683ifdef CONFIG_CC_STACKPROTECTOR_REGULAR 684 stackp-flag := -fstack-protector 685 stackp-name := REGULAR 686else 687ifdef CONFIG_CC_STACKPROTECTOR_STRONG 688 stackp-flag := -fstack-protector-strong 689 stackp-name := STRONG 690else 691 # If either there is no stack protector for this architecture or 692 # CONFIG_CC_STACKPROTECTOR_NONE is selected, we're done, and $(stackp-name) 693 # is empty, skipping all remaining stack protector tests. 694 # 695 # Force off for distro compilers that enable stack protector by default. 696 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector) 697endif 698endif 699endif 700# Find arch-specific stack protector compiler sanity-checking script. 701ifdef stackp-name 702ifneq ($(stackp-flag),) 703 stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh 704 stackp-check := $(wildcard $(stackp-path)) 705 # If the wildcard test matches a test script, run it to check functionality. 706 ifdef stackp-check 707 ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y) 708 stackp-broken := y 709 endif 710 endif 711 ifndef stackp-broken 712 # If the stack protector is functional, enable code that depends on it. 713 KBUILD_CPPFLAGS += -DCONFIG_CC_STACKPROTECTOR 714 # Either we've already detected the flag (for AUTO) or we'll fail the 715 # build in the prepare-compiler-check rule (for specific flag). 716 KBUILD_CFLAGS += $(stackp-flag) 717 else 718 # We have to make sure stack protector is unconditionally disabled if 719 # the compiler is broken (in case we're going to continue the build in 720 # AUTO mode). 721 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector) 722 endif 723endif 724endif 725 726ifeq ($(cc-name),clang) 727KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 728KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 729KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 730KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) 731# Quiet clang warning: comparison of unsigned expression < 0 is always false 732KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 733# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 734# source of a reference will be _MergedGlobals and not on of the whitelisted names. 735# See modpost pattern 2 736KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 737KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 738KBUILD_CFLAGS += $(call cc-option, -no-integrated-as) 739KBUILD_AFLAGS += $(call cc-option, -no-integrated-as) 740else 741 742# These warnings generated too much noise in a regular build. 743# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 744KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 745endif 746 747KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 748ifdef CONFIG_FRAME_POINTER 749KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 750else 751# Some targets (ARM with Thumb2, for example), can't be built with frame 752# pointers. For those, we don't have FUNCTION_TRACER automatically 753# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 754# incompatible with -fomit-frame-pointer with current GCC, so we don't use 755# -fomit-frame-pointer with FUNCTION_TRACER. 756ifndef CONFIG_FUNCTION_TRACER 757KBUILD_CFLAGS += -fomit-frame-pointer 758endif 759endif 760 761KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 762 763ifdef CONFIG_DEBUG_INFO 764ifdef CONFIG_DEBUG_INFO_SPLIT 765KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 766else 767KBUILD_CFLAGS += -g 768endif 769KBUILD_AFLAGS += -Wa,-gdwarf-2 770endif 771ifdef CONFIG_DEBUG_INFO_DWARF4 772KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 773endif 774 775ifdef CONFIG_DEBUG_INFO_REDUCED 776KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 777 $(call cc-option,-fno-var-tracking) 778endif 779 780ifdef CONFIG_FUNCTION_TRACER 781ifndef CC_FLAGS_FTRACE 782CC_FLAGS_FTRACE := -pg 783endif 784export CC_FLAGS_FTRACE 785ifdef CONFIG_HAVE_FENTRY 786CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 787endif 788KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY) 789KBUILD_AFLAGS += $(CC_USING_FENTRY) 790ifdef CONFIG_DYNAMIC_FTRACE 791 ifdef CONFIG_HAVE_C_RECORDMCOUNT 792 BUILD_C_RECORDMCOUNT := y 793 export BUILD_C_RECORDMCOUNT 794 endif 795endif 796endif 797 798# We trigger additional mismatches with less inlining 799ifdef CONFIG_DEBUG_SECTION_MISMATCH 800KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 801endif 802 803ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 804KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,) 805KBUILD_CFLAGS += $(call cc-option,-fdata-sections,) 806endif 807 808# arch Makefile may override CC so keep this after arch Makefile is included 809NOSTDINC_FLAGS += -nostdinc -isystem $(call shell-cached,$(CC) -print-file-name=include) 810CHECKFLAGS += $(NOSTDINC_FLAGS) 811 812# warn about C99 declaration after statement 813KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 814 815# disable pointer signed / unsigned warnings in gcc 4.0 816KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 817 818# disable invalid "can't wrap" optimizations for signed / pointers 819KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 820 821# Make sure -fstack-check isn't enabled (like gentoo apparently did) 822KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,) 823 824# conserve stack if available 825KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 826 827# disallow errors like 'EXPORT_GPL(foo);' with missing header 828KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 829 830# require functions to have arguments in prototypes, not empty 'int foo()' 831KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 832 833# Prohibit date/time macros, which would make the build non-deterministic 834KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 835 836# enforce correct pointer usage 837KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 838 839# Require designated initializers for all marked structures 840KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 841 842# use the deterministic mode of AR if available 843KBUILD_ARFLAGS := $(call ar-option,D) 844 845include scripts/Makefile.kasan 846include scripts/Makefile.extrawarn 847include scripts/Makefile.ubsan 848 849# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 850# last assignments 851KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 852KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 853KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 854 855# Use --build-id when available. 856LDFLAGS_BUILD_ID := $(call ld-option, --build-id) 857KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 858LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 859 860ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 861LDFLAGS_vmlinux += $(call ld-option, --gc-sections,) 862endif 863 864ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 865LDFLAGS_vmlinux += $(call ld-option, -X,) 866endif 867 868# Default kernel image to build when no specific target is given. 869# KBUILD_IMAGE may be overruled on the command line or 870# set in the environment 871# Also any assignments in arch/$(ARCH)/Makefile take precedence over 872# this default value 873export KBUILD_IMAGE ?= vmlinux 874 875# 876# INSTALL_PATH specifies where to place the updated kernel and system map 877# images. Default is /boot, but you can set it to other values 878export INSTALL_PATH ?= /boot 879 880# 881# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 882# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 883# an argument if needed. Otherwise it defaults to the kernel install path 884# 885export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 886 887# 888# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 889# relocations required by build roots. This is not defined in the 890# makefile but the argument can be passed to make if needed. 891# 892 893MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 894export MODLIB 895 896# 897# INSTALL_MOD_STRIP, if defined, will cause modules to be 898# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 899# the default option --strip-debug will be used. Otherwise, 900# INSTALL_MOD_STRIP value will be used as the options to the strip command. 901 902ifdef INSTALL_MOD_STRIP 903ifeq ($(INSTALL_MOD_STRIP),1) 904mod_strip_cmd = $(STRIP) --strip-debug 905else 906mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 907endif # INSTALL_MOD_STRIP=1 908else 909mod_strip_cmd = true 910endif # INSTALL_MOD_STRIP 911export mod_strip_cmd 912 913# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 914# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 915# or CONFIG_MODULE_COMPRESS_XZ. 916 917mod_compress_cmd = true 918ifdef CONFIG_MODULE_COMPRESS 919 ifdef CONFIG_MODULE_COMPRESS_GZIP 920 mod_compress_cmd = gzip -n -f 921 endif # CONFIG_MODULE_COMPRESS_GZIP 922 ifdef CONFIG_MODULE_COMPRESS_XZ 923 mod_compress_cmd = xz -f 924 endif # CONFIG_MODULE_COMPRESS_XZ 925endif # CONFIG_MODULE_COMPRESS 926export mod_compress_cmd 927 928# Select initial ramdisk compression format, default is gzip(1). 929# This shall be used by the dracut(8) tool while creating an initramfs image. 930# 931INITRD_COMPRESS-y := gzip 932INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 933INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 934INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 935INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 936INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 937# do not export INITRD_COMPRESS, since we didn't actually 938# choose a sane default compression above. 939# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 940 941ifdef CONFIG_MODULE_SIG_ALL 942$(eval $(call config_filename,MODULE_SIG_KEY)) 943 944mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 945else 946mod_sign_cmd = true 947endif 948export mod_sign_cmd 949 950ifdef CONFIG_STACK_VALIDATION 951 has_libelf := $(call try-run,\ 952 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0) 953 ifeq ($(has_libelf),1) 954 objtool_target := tools/objtool FORCE 955 else 956 ifdef CONFIG_UNWINDER_ORC 957 $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 958 else 959 $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 960 endif 961 SKIP_STACK_VALIDATION := 1 962 export SKIP_STACK_VALIDATION 963 endif 964endif 965 966 967ifeq ($(KBUILD_EXTMOD),) 968core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 969 970vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 971 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 972 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 973 974vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 975 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-)))) 976 977init-y := $(patsubst %/, %/built-in.o, $(init-y)) 978core-y := $(patsubst %/, %/built-in.o, $(core-y)) 979drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 980net-y := $(patsubst %/, %/built-in.o, $(net-y)) 981libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 982libs-y2 := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y))) 983virt-y := $(patsubst %/, %/built-in.o, $(virt-y)) 984 985# Externally visible symbols (used by link-vmlinux.sh) 986export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 987export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y) 988export KBUILD_VMLINUX_LIBS := $(libs-y1) 989export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 990export LDFLAGS_vmlinux 991# used by scripts/package/Makefile 992export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) 993 994vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS) 995 996# Include targets which we want to execute sequentially if the rest of the 997# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be 998# evaluated more than once. 999PHONY += vmlinux_prereq 1000vmlinux_prereq: $(vmlinux-deps) FORCE 1001ifdef CONFIG_HEADERS_CHECK 1002 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 1003endif 1004ifdef CONFIG_GDB_SCRIPTS 1005 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) 1006endif 1007ifdef CONFIG_TRIM_UNUSED_KSYMS 1008 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 1009 "$(MAKE) -f $(srctree)/Makefile vmlinux" 1010endif 1011 1012# standalone target for easier testing 1013include/generated/autoksyms.h: FORCE 1014 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true 1015 1016ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 1017 1018# Final link of vmlinux with optional arch pass after final link 1019cmd_link-vmlinux = \ 1020 $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ; \ 1021 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 1022 1023vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE 1024 +$(call if_changed,link-vmlinux) 1025 1026# Build samples along the rest of the kernel 1027ifdef CONFIG_SAMPLES 1028vmlinux-dirs += samples 1029endif 1030 1031# The actual objects are generated when descending, 1032# make sure no implicit rule kicks in 1033$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 1034 1035# Handle descending into subdirectories listed in $(vmlinux-dirs) 1036# Preset locale variables to speed up the build process. Limit locale 1037# tweaks to this spot to avoid wrong language settings when running 1038# make menuconfig etc. 1039# Error messages still appears in the original language 1040 1041PHONY += $(vmlinux-dirs) 1042$(vmlinux-dirs): prepare scripts 1043 $(Q)$(MAKE) $(build)=$@ need-builtin=1 1044 1045define filechk_kernel.release 1046 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1047endef 1048 1049# Store (new) KERNELRELEASE string in include/config/kernel.release 1050include/config/kernel.release: include/config/auto.conf FORCE 1051 $(call filechk,kernel.release) 1052 1053 1054# Things we need to do before we recursively start building the kernel 1055# or the modules are listed in "prepare". 1056# A multi level approach is used. prepareN is processed before prepareN-1. 1057# archprepare is used in arch Makefiles and when processed asm symlink, 1058# version.h and scripts_basic is processed / created. 1059 1060# Listed in dependency order 1061PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 1062 1063# prepare3 is used to check if we are building in a separate output directory, 1064# and if so do: 1065# 1) Check that make has not been executed in the kernel src $(srctree) 1066prepare3: include/config/kernel.release 1067ifneq ($(KBUILD_SRC),) 1068 @$(kecho) ' Using $(srctree) as source for kernel' 1069 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 1070 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 1071 echo >&2 " in the '$(srctree)' directory.";\ 1072 /bin/false; \ 1073 fi; 1074endif 1075 1076# prepare2 creates a makefile if using a separate output directory. 1077# From this point forward, .config has been reprocessed, so any rules 1078# that need to depend on updated CONFIG_* values can be checked here. 1079prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic 1080 1081prepare1: prepare2 $(version_h) include/generated/utsrelease.h \ 1082 include/config/auto.conf 1083 $(cmd_crmodverdir) 1084 1085archprepare: archheaders archscripts prepare1 scripts_basic 1086 1087prepare0: archprepare gcc-plugins 1088 $(Q)$(MAKE) $(build)=. 1089 1090# All the preparing.. 1091prepare: prepare0 prepare-objtool 1092 1093# Support for using generic headers in asm-generic 1094PHONY += asm-generic uapi-asm-generic 1095asm-generic: uapi-asm-generic 1096 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1097 src=asm obj=arch/$(SRCARCH)/include/generated/asm 1098uapi-asm-generic: 1099 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 1100 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 1101 1102PHONY += prepare-objtool 1103prepare-objtool: $(objtool_target) 1104 1105# Check for CONFIG flags that require compiler support. Abort the build 1106# after .config has been processed, but before the kernel build starts. 1107# 1108# For security-sensitive CONFIG options, we don't want to fallback and/or 1109# silently change which compiler flags will be used, since that leads to 1110# producing kernels with different security feature characteristics 1111# depending on the compiler used. (For example, "But I selected 1112# CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!") 1113PHONY += prepare-compiler-check 1114prepare-compiler-check: FORCE 1115# Make sure compiler supports requested stack protector flag. 1116ifdef stackp-name 1117 # Warn about CONFIG_CC_STACKPROTECTOR_AUTO having found no option. 1118 ifeq ($(stackp-flag),) 1119 @echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1120 Compiler does not support any known stack-protector >&2 1121 else 1122 # Fail if specifically requested stack protector is missing. 1123 ifeq ($(call cc-option, $(stackp-flag)),) 1124 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1125 $(stackp-flag) not supported by compiler >&2 && exit 1 1126 endif 1127 endif 1128endif 1129# Make sure compiler does not have buggy stack-protector support. If a 1130# specific stack-protector was requested, fail the build, otherwise warn. 1131ifdef stackp-broken 1132 ifeq ($(stackp-name),AUTO) 1133 @echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1134 $(stackp-flag) available but compiler is broken: disabling >&2 1135 else 1136 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1137 $(stackp-flag) available but compiler is broken >&2 && exit 1 1138 endif 1139endif 1140 @: 1141 1142# Generate some files 1143# --------------------------------------------------------------------------- 1144 1145# KERNELRELEASE can change from a few different places, meaning version.h 1146# needs to be updated, so this check is forced on all builds 1147 1148uts_len := 64 1149define filechk_utsrelease.h 1150 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1151 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1152 exit 1; \ 1153 fi; \ 1154 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 1155endef 1156 1157define filechk_version.h 1158 (echo \#define LINUX_VERSION_CODE $(shell \ 1159 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1160 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1161endef 1162 1163$(version_h): $(srctree)/Makefile FORCE 1164 $(call filechk,version.h) 1165 $(Q)rm -f $(old_version_h) 1166 1167include/generated/utsrelease.h: include/config/kernel.release FORCE 1168 $(call filechk,utsrelease.h) 1169 1170PHONY += headerdep 1171headerdep: 1172 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1173 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1174 1175# --------------------------------------------------------------------------- 1176# Kernel headers 1177 1178#Default location for installed headers 1179export INSTALL_HDR_PATH = $(objtree)/usr 1180 1181# If we do an all arch process set dst to include/arch-$(SRCARCH) 1182hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include) 1183 1184PHONY += archheaders 1185archheaders: 1186 1187PHONY += archscripts 1188archscripts: 1189 1190PHONY += __headers 1191__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts 1192 $(Q)$(MAKE) $(build)=scripts build_unifdef 1193 1194PHONY += headers_install_all 1195headers_install_all: 1196 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1197 1198PHONY += headers_install 1199headers_install: __headers 1200 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ 1201 $(error Headers not exportable for the $(SRCARCH) architecture)) 1202 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include 1203 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) 1204 1205PHONY += headers_check_all 1206headers_check_all: headers_install_all 1207 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1208 1209PHONY += headers_check 1210headers_check: headers_install 1211 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1 1212 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1 1213 1214# --------------------------------------------------------------------------- 1215# Kernel selftest 1216 1217PHONY += kselftest 1218kselftest: 1219 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests 1220 1221PHONY += kselftest-clean 1222kselftest-clean: 1223 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean 1224 1225PHONY += kselftest-merge 1226kselftest-merge: 1227 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1228 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \ 1229 -m $(objtree)/.config \ 1230 $(srctree)/tools/testing/selftests/*/config 1231 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1232 1233# --------------------------------------------------------------------------- 1234# Modules 1235 1236ifdef CONFIG_MODULES 1237 1238# By default, build modules as well 1239 1240all: modules 1241 1242# Build modules 1243# 1244# A module can be listed more than once in obj-m resulting in 1245# duplicate lines in modules.order files. Those are removed 1246# using awk while concatenating to the final file. 1247 1248PHONY += modules 1249modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1250 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1251 @$(kecho) ' Building modules, stage 2.'; 1252 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1253 1254modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1255 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1256 1257%/modules.builtin: include/config/auto.conf 1258 $(Q)$(MAKE) $(modbuiltin)=$* 1259 1260 1261# Target to prepare building external modules 1262PHONY += modules_prepare 1263modules_prepare: prepare scripts 1264 1265# Target to install modules 1266PHONY += modules_install 1267modules_install: _modinst_ _modinst_post 1268 1269PHONY += _modinst_ 1270_modinst_: 1271 @rm -rf $(MODLIB)/kernel 1272 @rm -f $(MODLIB)/source 1273 @mkdir -p $(MODLIB)/kernel 1274 @ln -s $(abspath $(srctree)) $(MODLIB)/source 1275 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1276 rm -f $(MODLIB)/build ; \ 1277 ln -s $(CURDIR) $(MODLIB)/build ; \ 1278 fi 1279 @cp -f $(objtree)/modules.order $(MODLIB)/ 1280 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1281 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1282 1283# This depmod is only for convenience to give the initial 1284# boot a modules.dep even before / is mounted read-write. However the 1285# boot script depmod is the master version. 1286PHONY += _modinst_post 1287_modinst_post: _modinst_ 1288 $(call cmd,depmod) 1289 1290ifeq ($(CONFIG_MODULE_SIG), y) 1291PHONY += modules_sign 1292modules_sign: 1293 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1294endif 1295 1296else # CONFIG_MODULES 1297 1298# Modules not configured 1299# --------------------------------------------------------------------------- 1300 1301PHONY += modules modules_install 1302modules modules_install: 1303 @echo >&2 1304 @echo >&2 "The present kernel configuration has modules disabled." 1305 @echo >&2 "Type 'make config' and enable loadable module support." 1306 @echo >&2 "Then build a kernel with module support enabled." 1307 @echo >&2 1308 @exit 1 1309 1310endif # CONFIG_MODULES 1311 1312### 1313# Cleaning is done on three levels. 1314# make clean Delete most generated files 1315# Leave enough to build external modules 1316# make mrproper Delete the current configuration, and all generated files 1317# make distclean Remove editor backup files, patch leftover files and the like 1318 1319# Directories & files removed with 'make clean' 1320CLEAN_DIRS += $(MODVERDIR) 1321 1322# Directories & files removed with 'make mrproper' 1323MRPROPER_DIRS += include/config usr/include include/generated \ 1324 arch/*/include/generated .tmp_objdiff 1325MRPROPER_FILES += .config .config.old .version \ 1326 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1327 signing_key.pem signing_key.priv signing_key.x509 \ 1328 x509.genkey extra_certificates signing_key.x509.keyid \ 1329 signing_key.x509.signer vmlinux-gdb.py 1330 1331# clean - Delete most, but leave enough to build external modules 1332# 1333clean: rm-dirs := $(CLEAN_DIRS) 1334clean: rm-files := $(CLEAN_FILES) 1335clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1336 1337PHONY += $(clean-dirs) clean archclean vmlinuxclean 1338$(clean-dirs): 1339 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1340 1341vmlinuxclean: 1342 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1343 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1344 1345clean: archclean vmlinuxclean 1346 1347# mrproper - Delete all generated files, including .config 1348# 1349mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1350mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1351mrproper-dirs := $(addprefix _mrproper_,scripts) 1352 1353PHONY += $(mrproper-dirs) mrproper archmrproper 1354$(mrproper-dirs): 1355 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1356 1357mrproper: clean archmrproper $(mrproper-dirs) 1358 $(call cmd,rmdirs) 1359 $(call cmd,rmfiles) 1360 1361# distclean 1362# 1363PHONY += distclean 1364 1365distclean: mrproper 1366 @find $(srctree) $(RCS_FIND_IGNORE) \ 1367 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1368 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1369 -o -name 'core' \) \ 1370 -type f -print | xargs rm -f 1371 1372 1373# Packaging of the kernel to various formats 1374# --------------------------------------------------------------------------- 1375# rpm target kept for backward compatibility 1376package-dir := scripts/package 1377 1378%src-pkg: FORCE 1379 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1380%pkg: include/config/kernel.release FORCE 1381 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1382rpm: rpm-pkg 1383 @echo " WARNING: \"rpm\" target will be removed after Linux 4.18" 1384 @echo " Please use \"rpm-pkg\" instead." 1385 1386 1387# Brief documentation of the typical targets used 1388# --------------------------------------------------------------------------- 1389 1390boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1391boards := $(sort $(notdir $(boards))) 1392board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1393board-dirs := $(sort $(notdir $(board-dirs:/=))) 1394 1395PHONY += help 1396help: 1397 @echo 'Cleaning targets:' 1398 @echo ' clean - Remove most generated files but keep the config and' 1399 @echo ' enough build support to build external modules' 1400 @echo ' mrproper - Remove all generated files + config + various backup files' 1401 @echo ' distclean - mrproper + remove editor backup and patch files' 1402 @echo '' 1403 @echo 'Configuration targets:' 1404 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1405 @echo '' 1406 @echo 'Other generic targets:' 1407 @echo ' all - Build all targets marked with [*]' 1408 @echo '* vmlinux - Build the bare kernel' 1409 @echo '* modules - Build all modules' 1410 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1411 @echo ' dir/ - Build all files in dir and below' 1412 @echo ' dir/file.[ois] - Build specified target only' 1413 @echo ' dir/file.ll - Build the LLVM assembly file' 1414 @echo ' (requires compiler support for LLVM assembly generation)' 1415 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1416 @echo ' (requires a recent binutils and recent build (System.map))' 1417 @echo ' dir/file.ko - Build module including final link' 1418 @echo ' modules_prepare - Set up for building external modules' 1419 @echo ' tags/TAGS - Generate tags file for editors' 1420 @echo ' cscope - Generate cscope index' 1421 @echo ' gtags - Generate GNU GLOBAL index' 1422 @echo ' kernelrelease - Output the release version string (use with make -s)' 1423 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1424 @echo ' image_name - Output the image name (use with make -s)' 1425 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1426 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1427 echo '' 1428 @echo 'Static analysers:' 1429 @echo ' checkstack - Generate a list of stack hogs' 1430 @echo ' namespacecheck - Name space analysis on compiled kernel' 1431 @echo ' versioncheck - Sanity check on version.h usage' 1432 @echo ' includecheck - Check for duplicate included header files' 1433 @echo ' export_report - List the usages of all exported symbols' 1434 @echo ' headers_check - Sanity check on exported headers' 1435 @echo ' headerdep - Detect inclusion cycles in headers' 1436 @echo ' coccicheck - Check with Coccinelle' 1437 @echo '' 1438 @echo 'Kernel selftest:' 1439 @echo ' kselftest - Build and run kernel selftest (run as root)' 1440 @echo ' Build, install, and boot kernel before' 1441 @echo ' running kselftest on it' 1442 @echo ' kselftest-clean - Remove all generated kselftest files' 1443 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' 1444 @echo ' .config.' 1445 @echo '' 1446 @echo 'Userspace tools targets:' 1447 @echo ' use "make tools/help"' 1448 @echo ' or "cd tools; make help"' 1449 @echo '' 1450 @echo 'Kernel packaging:' 1451 @$(MAKE) $(build)=$(package-dir) help 1452 @echo '' 1453 @echo 'Documentation targets:' 1454 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp 1455 @echo '' 1456 @echo 'Architecture specific targets ($(SRCARCH)):' 1457 @$(if $(archhelp),$(archhelp),\ 1458 echo ' No architecture specific help defined for $(SRCARCH)') 1459 @echo '' 1460 @$(if $(boards), \ 1461 $(foreach b, $(boards), \ 1462 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1463 echo '') 1464 @$(if $(board-dirs), \ 1465 $(foreach b, $(board-dirs), \ 1466 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1467 printf " %-16s - Show all of the above\\n" help-boards; \ 1468 echo '') 1469 1470 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1471 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1472 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1473 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' 1474 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1475 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1476 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1477 @echo ' 1: warnings which may be relevant and do not occur too often' 1478 @echo ' 2: warnings which occur quite often but may still be relevant' 1479 @echo ' 3: more obscure warnings, can most likely be ignored' 1480 @echo ' Multiple levels can be combined with W=12 or W=123' 1481 @echo '' 1482 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1483 @echo 'For further info see the ./README file' 1484 1485 1486help-board-dirs := $(addprefix help-,$(board-dirs)) 1487 1488help-boards: $(help-board-dirs) 1489 1490boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1491 1492$(help-board-dirs): help-%: 1493 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1494 @$(if $(boards-per-dir), \ 1495 $(foreach b, $(boards-per-dir), \ 1496 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1497 echo '') 1498 1499 1500# Documentation targets 1501# --------------------------------------------------------------------------- 1502DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ 1503 linkcheckdocs dochelp refcheckdocs 1504PHONY += $(DOC_TARGETS) 1505$(DOC_TARGETS): scripts_basic FORCE 1506 $(Q)$(MAKE) $(build)=Documentation $@ 1507 1508else # KBUILD_EXTMOD 1509 1510### 1511# External module support. 1512# When building external modules the kernel used as basis is considered 1513# read-only, and no consistency checks are made and the make 1514# system is not used on the basis kernel. If updates are required 1515# in the basis kernel ordinary make commands (without M=...) must 1516# be used. 1517# 1518# The following are the only valid targets when building external 1519# modules. 1520# make M=dir clean Delete all automatically generated files 1521# make M=dir modules Make all modules in specified dir 1522# make M=dir Same as 'make M=dir modules' 1523# make M=dir modules_install 1524# Install the modules built in the module directory 1525# Assumes install directory is already created 1526 1527# We are always building modules 1528KBUILD_MODULES := 1 1529PHONY += crmodverdir 1530crmodverdir: 1531 $(cmd_crmodverdir) 1532 1533PHONY += $(objtree)/Module.symvers 1534$(objtree)/Module.symvers: 1535 @test -e $(objtree)/Module.symvers || ( \ 1536 echo; \ 1537 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1538 echo " is missing; modules will have no dependencies and modversions."; \ 1539 echo ) 1540 1541module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1542PHONY += $(module-dirs) modules 1543$(module-dirs): crmodverdir $(objtree)/Module.symvers 1544 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1545 1546modules: $(module-dirs) 1547 @$(kecho) ' Building modules, stage 2.'; 1548 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1549 1550PHONY += modules_install 1551modules_install: _emodinst_ _emodinst_post 1552 1553install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1554PHONY += _emodinst_ 1555_emodinst_: 1556 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1557 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1558 1559PHONY += _emodinst_post 1560_emodinst_post: _emodinst_ 1561 $(call cmd,depmod) 1562 1563clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1564 1565PHONY += $(clean-dirs) clean 1566$(clean-dirs): 1567 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1568 1569clean: rm-dirs := $(MODVERDIR) 1570clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1571 1572PHONY += help 1573help: 1574 @echo ' Building external modules.' 1575 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1576 @echo '' 1577 @echo ' modules - default target, build the module(s)' 1578 @echo ' modules_install - install the module' 1579 @echo ' clean - remove generated files in module directory only' 1580 @echo '' 1581 1582# Dummies... 1583PHONY += prepare scripts 1584prepare: ; 1585scripts: ; 1586endif # KBUILD_EXTMOD 1587 1588clean: $(clean-dirs) 1589 $(call cmd,rmdirs) 1590 $(call cmd,rmfiles) 1591 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1592 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ 1593 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \ 1594 -o -name '*.dwo' -o -name '*.lst' \ 1595 -o -name '*.su' \ 1596 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1597 -o -name '*.symtypes' -o -name 'modules.order' \ 1598 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1599 -o -name .cache.mk \ 1600 -o -name '*.c.[012]*.*' \ 1601 -o -name '*.ll' \ 1602 -o -name '*.gcno' \) -type f -print | xargs rm -f 1603 1604# Generate tags for editors 1605# --------------------------------------------------------------------------- 1606quiet_cmd_tags = GEN $@ 1607 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1608 1609tags TAGS cscope gtags: FORCE 1610 $(call cmd,tags) 1611 1612# Scripts to check various things for consistency 1613# --------------------------------------------------------------------------- 1614 1615PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1616 1617includecheck: 1618 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1619 -name '*.[hcS]' -type f -print | sort \ 1620 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1621 1622versioncheck: 1623 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1624 -name '*.[hcS]' -type f -print | sort \ 1625 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1626 1627coccicheck: 1628 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1629 1630namespacecheck: 1631 $(PERL) $(srctree)/scripts/namespace.pl 1632 1633export_report: 1634 $(PERL) $(srctree)/scripts/export_report.pl 1635 1636endif #ifeq ($(config-targets),1) 1637endif #ifeq ($(mixed-targets),1) 1638 1639PHONY += checkstack kernelrelease kernelversion image_name 1640 1641# UML needs a little special treatment here. It wants to use the host 1642# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1643# else wants $(ARCH), including people doing cross-builds, which means 1644# that $(SUBARCH) doesn't work here. 1645ifeq ($(ARCH), um) 1646CHECKSTACK_ARCH := $(SUBARCH) 1647else 1648CHECKSTACK_ARCH := $(ARCH) 1649endif 1650checkstack: 1651 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1652 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1653 1654kernelrelease: 1655 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1656 1657kernelversion: 1658 @echo $(KERNELVERSION) 1659 1660image_name: 1661 @echo $(KBUILD_IMAGE) 1662 1663# Clear a bunch of variables before executing the submake 1664tools/: FORCE 1665 $(Q)mkdir -p $(objtree)/tools 1666 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ 1667 1668tools/%: FORCE 1669 $(Q)mkdir -p $(objtree)/tools 1670 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $* 1671 1672# Single targets 1673# --------------------------------------------------------------------------- 1674# Single targets are compatible with: 1675# - build with mixed source and output 1676# - build with separate output dir 'make O=...' 1677# - external modules 1678# 1679# target-dir => where to store outputfile 1680# build-dir => directory in kernel source tree to use 1681 1682ifeq ($(KBUILD_EXTMOD),) 1683 build-dir = $(patsubst %/,%,$(dir $@)) 1684 target-dir = $(dir $@) 1685else 1686 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1687 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1688 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1689endif 1690 1691%.s: %.c prepare scripts FORCE 1692 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1693%.i: %.c prepare scripts FORCE 1694 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1695%.o: %.c prepare scripts FORCE 1696 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1697%.lst: %.c prepare scripts FORCE 1698 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1699%.s: %.S prepare scripts FORCE 1700 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1701%.o: %.S prepare scripts FORCE 1702 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1703%.symtypes: %.c prepare scripts FORCE 1704 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1705%.ll: %.c prepare scripts FORCE 1706 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1707 1708# Modules 1709/: prepare scripts FORCE 1710 $(cmd_crmodverdir) 1711 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1712 $(build)=$(build-dir) 1713# Make sure the latest headers are built for Documentation 1714Documentation/ samples/: headers_install 1715%/: prepare scripts FORCE 1716 $(cmd_crmodverdir) 1717 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1718 $(build)=$(build-dir) 1719%.ko: prepare scripts FORCE 1720 $(cmd_crmodverdir) 1721 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1722 $(build)=$(build-dir) $(@:.ko=.o) 1723 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1724 1725# FIXME Should go into a make.lib or something 1726# =========================================================================== 1727 1728quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1729 cmd_rmdirs = rm -rf $(rm-dirs) 1730 1731quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1732 cmd_rmfiles = rm -f $(rm-files) 1733 1734# Run depmod only if we have System.map and depmod is executable 1735quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1736 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1737 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))" 1738 1739# Create temporary dir for module support files 1740# clean it up only when building all modules 1741cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1742 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1743 1744# read all saved command lines 1745 1746cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd)) 1747 1748ifneq ($(cmd_files),) 1749 $(cmd_files): ; # Do not try to update included dependency files 1750 include $(cmd_files) 1751endif 1752 1753endif # skip-makefile 1754 1755PHONY += FORCE 1756FORCE: 1757 1758# Declare the contents of the .PHONY variable as phony. We keep that 1759# information in a variable so we can use it in if_changed and friends. 1760.PHONY: $(PHONY) 1761