1VERSION = 4 2PATCHLEVEL = 12 3SUBLEVEL = 0 4EXTRAVERSION = -rc6 5NAME = Fearless Coyote 6 7# *DOCUMENTATION* 8# To see a list of typical targets execute "make help" 9# More info can be located in ./README 10# Comments in this file are targeted only to the developer, do not 11# expect to learn how to build the kernel reading this file. 12 13# o Do not use make's built-in rules and variables 14# (this increases performance and avoids hard-to-debug behaviour); 15# o Look for make include files relative to root of kernel src 16MAKEFLAGS += -rR --include-dir=$(CURDIR) 17 18# Avoid funny character set dependencies 19unexport LC_ALL 20LC_COLLATE=C 21LC_NUMERIC=C 22export LC_COLLATE LC_NUMERIC 23 24# Avoid interference with shell env settings 25unexport GREP_OPTIONS 26 27# We are using a recursive build, so we need to do a little thinking 28# to get the ordering right. 29# 30# Most importantly: sub-Makefiles should only ever modify files in 31# their own directory. If in some directory we have a dependency on 32# a file in another dir (which doesn't happen often, but it's often 33# unavoidable when linking the built-in.o targets which finally 34# turn into vmlinux), we will call a sub make in that other dir, and 35# after that we are sure that everything which is in that other dir 36# is now up to date. 37# 38# The only cases where we need to modify files which have global 39# effects are thus separated out and done before the recursive 40# descending is started. They are now explicitly listed as the 41# prepare rule. 42 43# Beautify output 44# --------------------------------------------------------------------------- 45# 46# Normally, we echo the whole command before executing it. By making 47# that echo $($(quiet)$(cmd)), we now have the possibility to set 48# $(quiet) to choose other forms of output instead, e.g. 49# 50# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 51# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 52# 53# If $(quiet) is empty, the whole command will be printed. 54# If it is set to "quiet_", only the short version will be printed. 55# If it is set to "silent_", nothing will be printed at all, since 56# the variable $(silent_cmd_cc_o_c) doesn't exist. 57# 58# A simple variant is to prefix commands with $(Q) - that's useful 59# for commands that shall be hidden in non-verbose mode. 60# 61# $(Q)ln $@ :< 62# 63# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 64# If KBUILD_VERBOSE equals 1 then the above command is displayed. 65# 66# To put more focus on warnings, be less verbose as default 67# Use 'make V=1' to see the full commands 68 69ifeq ("$(origin V)", "command line") 70 KBUILD_VERBOSE = $(V) 71endif 72ifndef KBUILD_VERBOSE 73 KBUILD_VERBOSE = 0 74endif 75 76ifeq ($(KBUILD_VERBOSE),1) 77 quiet = 78 Q = 79else 80 quiet=quiet_ 81 Q = @ 82endif 83 84# If the user is running make -s (silent mode), suppress echoing of 85# commands 86 87ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4 88ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),) 89 quiet=silent_ 90 tools_silent=s 91endif 92else # make-3.8x 93ifneq ($(filter s% -s%,$(MAKEFLAGS)),) 94 quiet=silent_ 95 tools_silent=-s 96endif 97endif 98 99export quiet Q KBUILD_VERBOSE 100 101# kbuild supports saving output files in a separate directory. 102# To locate output files in a separate directory two syntaxes are supported. 103# In both cases the working directory must be the root of the kernel src. 104# 1) O= 105# Use "make O=dir/to/store/output/files/" 106# 107# 2) Set KBUILD_OUTPUT 108# Set the environment variable KBUILD_OUTPUT to point to the directory 109# where the output files shall be placed. 110# export KBUILD_OUTPUT=dir/to/store/output/files/ 111# make 112# 113# The O= assignment takes precedence over the KBUILD_OUTPUT environment 114# variable. 115 116# KBUILD_SRC is set on invocation of make in OBJ directory 117# KBUILD_SRC is not intended to be used by the regular user (for now) 118ifeq ($(KBUILD_SRC),) 119 120# OK, Make called in directory where kernel src resides 121# Do we want to locate output files in a separate directory? 122ifeq ("$(origin O)", "command line") 123 KBUILD_OUTPUT := $(O) 124endif 125 126# That's our default target when none is given on the command line 127PHONY := _all 128_all: 129 130# Cancel implicit rules on top Makefile 131$(CURDIR)/Makefile Makefile: ; 132 133ifneq ($(words $(subst :, ,$(CURDIR))), 1) 134 $(error main directory cannot contain spaces nor colons) 135endif 136 137ifneq ($(KBUILD_OUTPUT),) 138# Invoke a second make in the output directory, passing relevant variables 139# check that the output directory actually exists 140saved-output := $(KBUILD_OUTPUT) 141KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \ 142 && /bin/pwd) 143$(if $(KBUILD_OUTPUT),, \ 144 $(error failed to create output directory "$(saved-output)")) 145 146PHONY += $(MAKECMDGOALS) sub-make 147 148$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make 149 @: 150 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 KBUILD_EXTMOD ?= $(SUBDIRS) 190endif 191 192ifeq ("$(origin M)", "command line") 193 KBUILD_EXTMOD := $(M) 194endif 195 196# If building an external module we do not care about the all: rule 197# but instead _all depend on modules 198PHONY += all 199ifeq ($(KBUILD_EXTMOD),) 200_all: all 201else 202_all: modules 203endif 204 205ifeq ($(KBUILD_SRC),) 206 # building in the source tree 207 srctree := . 208else 209 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR))) 210 # building in a subdirectory of the source tree 211 srctree := .. 212 else 213 srctree := $(KBUILD_SRC) 214 endif 215endif 216objtree := . 217src := $(srctree) 218obj := $(objtree) 219 220VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD)) 221 222export srctree objtree VPATH 223 224# SUBARCH tells the usermode build what the underlying arch is. That is set 225# first, and if a usermode build is happening, the "ARCH=um" on the command 226# line overrides the setting of ARCH below. If a native build is happening, 227# then ARCH is assigned, getting whatever value it gets normally, and 228# SUBARCH is subsequently ignored. 229 230SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \ 231 -e s/sun4u/sparc64/ \ 232 -e s/arm.*/arm/ -e s/sa110/arm/ \ 233 -e s/s390x/s390/ -e s/parisc64/parisc/ \ 234 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \ 235 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ ) 236 237# Cross compiling and selecting different set of gcc/bin-utils 238# --------------------------------------------------------------------------- 239# 240# When performing cross compilation for other architectures ARCH shall be set 241# to the target architecture. (See arch/* for the possibilities). 242# ARCH can be set during invocation of make: 243# make ARCH=ia64 244# Another way is to have ARCH set in the environment. 245# The default ARCH is the host where make is executed. 246 247# CROSS_COMPILE specify the prefix used for all executables used 248# during compilation. Only gcc and related bin-utils executables 249# are prefixed with $(CROSS_COMPILE). 250# CROSS_COMPILE can be set on the command line 251# make CROSS_COMPILE=ia64-linux- 252# Alternatively CROSS_COMPILE can be set in the environment. 253# A third alternative is to store a setting in .config so that plain 254# "make" in the configured kernel build directory always uses that. 255# Default value for CROSS_COMPILE is not to prefix executables 256# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 257ARCH ?= $(SUBARCH) 258CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%) 259 260# Architecture as present in compile.h 261UTS_MACHINE := $(ARCH) 262SRCARCH := $(ARCH) 263 264# Additional ARCH settings for x86 265ifeq ($(ARCH),i386) 266 SRCARCH := x86 267endif 268ifeq ($(ARCH),x86_64) 269 SRCARCH := x86 270endif 271 272# Additional ARCH settings for sparc 273ifeq ($(ARCH),sparc32) 274 SRCARCH := sparc 275endif 276ifeq ($(ARCH),sparc64) 277 SRCARCH := sparc 278endif 279 280# Additional ARCH settings for sh 281ifeq ($(ARCH),sh64) 282 SRCARCH := sh 283endif 284 285# Additional ARCH settings for tile 286ifeq ($(ARCH),tilepro) 287 SRCARCH := tile 288endif 289ifeq ($(ARCH),tilegx) 290 SRCARCH := tile 291endif 292 293# Where to locate arch specific headers 294hdr-arch := $(SRCARCH) 295 296KCONFIG_CONFIG ?= .config 297export KCONFIG_CONFIG 298 299# SHELL used by kbuild 300CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 301 else if [ -x /bin/bash ]; then echo /bin/bash; \ 302 else echo sh; fi ; fi) 303 304HOSTCC = gcc 305HOSTCXX = g++ 306HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89 307HOSTCXXFLAGS = -O2 308 309ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1) 310HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \ 311 -Wno-missing-field-initializers -fno-delete-null-pointer-checks 312endif 313 314# Decide whether to build built-in, modular, or both. 315# Normally, just do built-in. 316 317KBUILD_MODULES := 318KBUILD_BUILTIN := 1 319 320# If we have only "make modules", don't compile built-in objects. 321# When we're building modules with modversions, we need to consider 322# the built-in objects during the descend as well, in order to 323# make sure the checksums are up to date before we record them. 324 325ifeq ($(MAKECMDGOALS),modules) 326 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 327endif 328 329# If we have "make <whatever> modules", compile modules 330# in addition to whatever we do anyway. 331# Just "make" or "make all" shall build modules as well 332 333ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 334 KBUILD_MODULES := 1 335endif 336 337ifeq ($(MAKECMDGOALS),) 338 KBUILD_MODULES := 1 339endif 340 341export KBUILD_MODULES KBUILD_BUILTIN 342export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD 343 344# We need some generic definitions (do not try to remake the file). 345scripts/Kbuild.include: ; 346include scripts/Kbuild.include 347 348# Make variables (CC, etc...) 349AS = $(CROSS_COMPILE)as 350LD = $(CROSS_COMPILE)ld 351CC = $(CROSS_COMPILE)gcc 352CPP = $(CC) -E 353AR = $(CROSS_COMPILE)ar 354NM = $(CROSS_COMPILE)nm 355STRIP = $(CROSS_COMPILE)strip 356OBJCOPY = $(CROSS_COMPILE)objcopy 357OBJDUMP = $(CROSS_COMPILE)objdump 358AWK = awk 359GENKSYMS = scripts/genksyms/genksyms 360INSTALLKERNEL := installkernel 361DEPMOD = /sbin/depmod 362PERL = perl 363PYTHON = python 364CHECK = sparse 365 366CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 367 -Wbitwise -Wno-return-void $(CF) 368NOSTDINC_FLAGS = 369CFLAGS_MODULE = 370AFLAGS_MODULE = 371LDFLAGS_MODULE = 372CFLAGS_KERNEL = 373AFLAGS_KERNEL = 374LDFLAGS_vmlinux = 375CFLAGS_GCOV := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,) 376CFLAGS_KCOV := $(call cc-option,-fsanitize-coverage=trace-pc,) 377 378 379# Use USERINCLUDE when you must reference the UAPI directories only. 380USERINCLUDE := \ 381 -I$(srctree)/arch/$(hdr-arch)/include/uapi \ 382 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \ 383 -I$(srctree)/include/uapi \ 384 -I$(objtree)/include/generated/uapi \ 385 -include $(srctree)/include/linux/kconfig.h 386 387# Use LINUXINCLUDE when you must reference the include/ directory. 388# Needed to be compatible with the O= option 389LINUXINCLUDE := \ 390 -I$(srctree)/arch/$(hdr-arch)/include \ 391 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \ 392 -I$(objtree)/arch/$(hdr-arch)/include/generated \ 393 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 394 -I$(objtree)/include 395 396LINUXINCLUDE += $(filter-out $(LINUXINCLUDE),$(USERINCLUDE)) 397 398KBUILD_CPPFLAGS := -D__KERNEL__ 399 400KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 401 -fno-strict-aliasing -fno-common \ 402 -Werror-implicit-function-declaration \ 403 -Wno-format-security \ 404 -std=gnu89 $(call cc-option,-fno-PIE) 405 406 407KBUILD_AFLAGS_KERNEL := 408KBUILD_CFLAGS_KERNEL := 409KBUILD_AFLAGS := -D__ASSEMBLY__ $(call cc-option,-fno-PIE) 410KBUILD_AFLAGS_MODULE := -DMODULE 411KBUILD_CFLAGS_MODULE := -DMODULE 412KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 413 414# Read KERNELRELEASE from include/config/kernel.release (if it exists) 415KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 416KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 417 418export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 419export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC 420export CPP AR NM STRIP OBJCOPY OBJDUMP 421export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE 422export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 423 424export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 425export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN 426export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 427export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 428export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 429export KBUILD_ARFLAGS 430 431# When compiling out-of-tree modules, put MODVERDIR in the module 432# tree rather than in the kernel tree. The kernel tree might 433# even be read-only. 434export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 435 436# Files to ignore in find ... statements 437 438export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 439 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 440 -prune -o 441export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 442 --exclude CVS --exclude .pc --exclude .hg --exclude .git 443 444# =========================================================================== 445# Rules shared between *config targets and build targets 446 447# Basic helpers built in scripts/ 448PHONY += scripts_basic 449scripts_basic: 450 $(Q)$(MAKE) $(build)=scripts/basic 451 $(Q)rm -f .tmp_quiet_recordmcount 452 453# To avoid any implicit rule to kick in, define an empty command. 454scripts/basic/%: scripts_basic ; 455 456PHONY += outputmakefile 457# outputmakefile generates a Makefile in the output directory, if using a 458# separate output directory. This allows convenient use of make in the 459# output directory. 460outputmakefile: 461ifneq ($(KBUILD_SRC),) 462 $(Q)ln -fsn $(srctree) source 463 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 464 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 465endif 466 467# Support for using generic headers in asm-generic 468PHONY += asm-generic 469asm-generic: 470 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 471 src=asm obj=arch/$(SRCARCH)/include/generated/asm 472 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 473 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 474 475# To make sure we do not include .config for any of the *config targets 476# catch them early, and hand them over to scripts/kconfig/Makefile 477# It is allowed to specify more targets when calling make, including 478# mixing *config targets and build targets. 479# For example 'make oldconfig all'. 480# Detect when mixed targets is specified, and make a second invocation 481# of make so .config is not included in this case either (for *config). 482 483version_h := include/generated/uapi/linux/version.h 484old_version_h := include/linux/version.h 485 486no-dot-config-targets := clean mrproper distclean \ 487 cscope gtags TAGS tags help% %docs check% coccicheck \ 488 $(version_h) headers_% archheaders archscripts \ 489 kernelversion %src-pkg 490 491config-targets := 0 492mixed-targets := 0 493dot-config := 1 494 495ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 496 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 497 dot-config := 0 498 endif 499endif 500 501ifeq ($(KBUILD_EXTMOD),) 502 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 503 config-targets := 1 504 ifneq ($(words $(MAKECMDGOALS)),1) 505 mixed-targets := 1 506 endif 507 endif 508endif 509# install and module_install need also be processed one by one 510ifneq ($(filter install,$(MAKECMDGOALS)),) 511 ifneq ($(filter modules_install,$(MAKECMDGOALS)),) 512 mixed-targets := 1 513 endif 514endif 515 516ifeq ($(mixed-targets),1) 517# =========================================================================== 518# We're called with mixed targets (*config and build targets). 519# Handle them one by one. 520 521PHONY += $(MAKECMDGOALS) __build_one_by_one 522 523$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 524 @: 525 526__build_one_by_one: 527 $(Q)set -e; \ 528 for i in $(MAKECMDGOALS); do \ 529 $(MAKE) -f $(srctree)/Makefile $$i; \ 530 done 531 532else 533ifeq ($(config-targets),1) 534# =========================================================================== 535# *config targets only - make sure prerequisites are updated, and descend 536# in scripts/kconfig to make the *config target 537 538# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 539# KBUILD_DEFCONFIG may point out an alternative default configuration 540# used for 'make defconfig' 541include arch/$(SRCARCH)/Makefile 542export KBUILD_DEFCONFIG KBUILD_KCONFIG 543 544config: scripts_basic outputmakefile FORCE 545 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 546 547%config: scripts_basic outputmakefile FORCE 548 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 549 550else 551# =========================================================================== 552# Build targets only - this includes vmlinux, arch specific targets, clean 553# targets and others. In general all targets except *config targets. 554 555ifeq ($(KBUILD_EXTMOD),) 556# Additional helpers built in scripts/ 557# Carefully list dependencies so we do not try to build scripts twice 558# in parallel 559PHONY += scripts 560scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \ 561 asm-generic gcc-plugins 562 $(Q)$(MAKE) $(build)=$(@) 563 564# Objects we will link into vmlinux / subdirs we need to visit 565init-y := init/ 566drivers-y := drivers/ sound/ firmware/ 567net-y := net/ 568libs-y := lib/ 569core-y := usr/ 570virt-y := virt/ 571endif # KBUILD_EXTMOD 572 573ifeq ($(dot-config),1) 574# Read in config 575-include include/config/auto.conf 576 577ifeq ($(KBUILD_EXTMOD),) 578# Read in dependencies to all Kconfig* files, make sure to run 579# oldconfig if changes are detected. 580-include include/config/auto.conf.cmd 581 582# To avoid any implicit rule to kick in, define an empty command 583$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 584 585# If .config is newer than include/config/auto.conf, someone tinkered 586# with it and forgot to run make oldconfig. 587# if auto.conf.cmd is missing then we are probably in a cleaned tree so 588# we execute the config step to be sure to catch updated Kconfig files 589include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 590 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 591else 592# external modules needs include/generated/autoconf.h and include/config/auto.conf 593# but do not care if they are up-to-date. Use auto.conf to trigger the test 594PHONY += include/config/auto.conf 595 596include/config/auto.conf: 597 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 598 echo >&2; \ 599 echo >&2 " ERROR: Kernel configuration is invalid."; \ 600 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 601 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 602 echo >&2 ; \ 603 /bin/false) 604 605endif # KBUILD_EXTMOD 606 607else 608# Dummy target needed, because used as prerequisite 609include/config/auto.conf: ; 610endif # $(dot-config) 611 612# For the kernel to actually contain only the needed exported symbols, 613# we have to build modules as well to determine what those symbols are. 614# (this can be evaluated only once include/config/auto.conf has been included) 615ifdef CONFIG_TRIM_UNUSED_KSYMS 616 KBUILD_MODULES := 1 617endif 618 619# The all: target is the default when no target is given on the 620# command line. 621# This allow a user to issue only 'make' to build a kernel including modules 622# Defaults to vmlinux, but the arch makefile usually adds further targets 623all: vmlinux 624 625# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default 626# values of the respective KBUILD_* variables 627ARCH_CPPFLAGS := 628ARCH_AFLAGS := 629ARCH_CFLAGS := 630include arch/$(SRCARCH)/Makefile 631 632KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 633KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) 634 635ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 636KBUILD_CFLAGS += $(call cc-option,-Oz,-Os) 637KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,) 638else 639ifdef CONFIG_PROFILE_ALL_BRANCHES 640KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,) 641else 642KBUILD_CFLAGS += -O2 643endif 644endif 645 646KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \ 647 $(call cc-disable-warning,maybe-uninitialized,)) 648 649# Tell gcc to never replace conditional load with a non-conditional one 650KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 651 652# check for 'asm goto' 653ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y) 654 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 655 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO 656endif 657 658include scripts/Makefile.gcc-plugins 659 660ifdef CONFIG_READABLE_ASM 661# Disable optimizations that make assembler listings hard to read. 662# reorder blocks reorders the control in the function 663# ipa clone creates specialized cloned functions 664# partial inlining inlines only parts of functions 665KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 666 $(call cc-option,-fno-ipa-cp-clone,) \ 667 $(call cc-option,-fno-partial-inlining) 668endif 669 670ifneq ($(CONFIG_FRAME_WARN),0) 671KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 672endif 673 674# This selects the stack protector compiler flag. Testing it is delayed 675# until after .config has been reprocessed, in the prepare-compiler-check 676# target. 677ifdef CONFIG_CC_STACKPROTECTOR_REGULAR 678 stackp-flag := -fstack-protector 679 stackp-name := REGULAR 680else 681ifdef CONFIG_CC_STACKPROTECTOR_STRONG 682 stackp-flag := -fstack-protector-strong 683 stackp-name := STRONG 684else 685 # Force off for distro compilers that enable stack protector by default. 686 stackp-flag := $(call cc-option, -fno-stack-protector) 687endif 688endif 689# Find arch-specific stack protector compiler sanity-checking script. 690ifdef CONFIG_CC_STACKPROTECTOR 691 stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh 692 stackp-check := $(wildcard $(stackp-path)) 693endif 694KBUILD_CFLAGS += $(stackp-flag) 695 696ifeq ($(cc-name),clang) 697ifneq ($(CROSS_COMPILE),) 698CLANG_TARGET := -target $(notdir $(CROSS_COMPILE:%-=%)) 699GCC_TOOLCHAIN := $(realpath $(dir $(shell which $(LD)))/..) 700endif 701ifneq ($(GCC_TOOLCHAIN),) 702CLANG_GCC_TC := -gcc-toolchain $(GCC_TOOLCHAIN) 703endif 704KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 705KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) 706KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 707KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable) 708KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 709KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 710# Quiet clang warning: comparison of unsigned expression < 0 is always false 711KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 712# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 713# source of a reference will be _MergedGlobals and not on of the whitelisted names. 714# See modpost pattern 2 715KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 716KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 717KBUILD_CFLAGS += $(call cc-option, -no-integrated-as) 718KBUILD_AFLAGS += $(call cc-option, -no-integrated-as) 719else 720 721# These warnings generated too much noise in a regular build. 722# Use make W=1 to enable them (see scripts/Makefile.extrawarn) 723KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 724KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) 725endif 726 727ifdef CONFIG_FRAME_POINTER 728KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 729else 730# Some targets (ARM with Thumb2, for example), can't be built with frame 731# pointers. For those, we don't have FUNCTION_TRACER automatically 732# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 733# incompatible with -fomit-frame-pointer with current GCC, so we don't use 734# -fomit-frame-pointer with FUNCTION_TRACER. 735ifndef CONFIG_FUNCTION_TRACER 736KBUILD_CFLAGS += -fomit-frame-pointer 737endif 738endif 739 740KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 741 742ifdef CONFIG_DEBUG_INFO 743ifdef CONFIG_DEBUG_INFO_SPLIT 744KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 745else 746KBUILD_CFLAGS += -g 747endif 748KBUILD_AFLAGS += -Wa,-gdwarf-2 749endif 750ifdef CONFIG_DEBUG_INFO_DWARF4 751KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 752endif 753 754ifdef CONFIG_DEBUG_INFO_REDUCED 755KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 756 $(call cc-option,-fno-var-tracking) 757endif 758 759ifdef CONFIG_FUNCTION_TRACER 760ifndef CC_FLAGS_FTRACE 761CC_FLAGS_FTRACE := -pg 762endif 763export CC_FLAGS_FTRACE 764ifdef CONFIG_HAVE_FENTRY 765CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 766endif 767KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY) 768KBUILD_AFLAGS += $(CC_USING_FENTRY) 769ifdef CONFIG_DYNAMIC_FTRACE 770 ifdef CONFIG_HAVE_C_RECORDMCOUNT 771 BUILD_C_RECORDMCOUNT := y 772 export BUILD_C_RECORDMCOUNT 773 endif 774endif 775endif 776 777# We trigger additional mismatches with less inlining 778ifdef CONFIG_DEBUG_SECTION_MISMATCH 779KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 780endif 781 782ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 783KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,) 784KBUILD_CFLAGS += $(call cc-option,-fdata-sections,) 785endif 786 787# arch Makefile may override CC so keep this after arch Makefile is included 788NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 789CHECKFLAGS += $(NOSTDINC_FLAGS) 790 791# warn about C99 declaration after statement 792KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 793 794# disable pointer signed / unsigned warnings in gcc 4.0 795KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 796 797# disable invalid "can't wrap" optimizations for signed / pointers 798KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 799 800# conserve stack if available 801KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 802 803# disallow errors like 'EXPORT_GPL(foo);' with missing header 804KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 805 806# require functions to have arguments in prototypes, not empty 'int foo()' 807KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 808 809# Prohibit date/time macros, which would make the build non-deterministic 810KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 811 812# enforce correct pointer usage 813KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types) 814 815# Require designated initializers for all marked structures 816KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init) 817 818# use the deterministic mode of AR if available 819KBUILD_ARFLAGS := $(call ar-option,D) 820 821include scripts/Makefile.kasan 822include scripts/Makefile.extrawarn 823include scripts/Makefile.ubsan 824 825# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the 826# last assignments 827KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS) 828KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS) 829KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS) 830 831# Use --build-id when available. 832LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\ 833 $(call cc-ldoption, -Wl$(comma)--build-id,)) 834KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 835LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 836 837ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION 838LDFLAGS_vmlinux += $(call ld-option, --gc-sections,) 839endif 840 841ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 842LDFLAGS_vmlinux += $(call ld-option, -X,) 843endif 844 845# Default kernel image to build when no specific target is given. 846# KBUILD_IMAGE may be overruled on the command line or 847# set in the environment 848# Also any assignments in arch/$(ARCH)/Makefile take precedence over 849# this default value 850export KBUILD_IMAGE ?= vmlinux 851 852# 853# INSTALL_PATH specifies where to place the updated kernel and system map 854# images. Default is /boot, but you can set it to other values 855export INSTALL_PATH ?= /boot 856 857# 858# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 859# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 860# an argument if needed. Otherwise it defaults to the kernel install path 861# 862export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 863 864# 865# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 866# relocations required by build roots. This is not defined in the 867# makefile but the argument can be passed to make if needed. 868# 869 870MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 871export MODLIB 872 873# 874# INSTALL_MOD_STRIP, if defined, will cause modules to be 875# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 876# the default option --strip-debug will be used. Otherwise, 877# INSTALL_MOD_STRIP value will be used as the options to the strip command. 878 879ifdef INSTALL_MOD_STRIP 880ifeq ($(INSTALL_MOD_STRIP),1) 881mod_strip_cmd = $(STRIP) --strip-debug 882else 883mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 884endif # INSTALL_MOD_STRIP=1 885else 886mod_strip_cmd = true 887endif # INSTALL_MOD_STRIP 888export mod_strip_cmd 889 890# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 891# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 892# or CONFIG_MODULE_COMPRESS_XZ. 893 894mod_compress_cmd = true 895ifdef CONFIG_MODULE_COMPRESS 896 ifdef CONFIG_MODULE_COMPRESS_GZIP 897 mod_compress_cmd = gzip -n -f 898 endif # CONFIG_MODULE_COMPRESS_GZIP 899 ifdef CONFIG_MODULE_COMPRESS_XZ 900 mod_compress_cmd = xz -f 901 endif # CONFIG_MODULE_COMPRESS_XZ 902endif # CONFIG_MODULE_COMPRESS 903export mod_compress_cmd 904 905# Select initial ramdisk compression format, default is gzip(1). 906# This shall be used by the dracut(8) tool while creating an initramfs image. 907# 908INITRD_COMPRESS-y := gzip 909INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 910INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 911INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 912INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 913INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 914# do not export INITRD_COMPRESS, since we didn't actually 915# choose a sane default compression above. 916# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 917 918ifdef CONFIG_MODULE_SIG_ALL 919$(eval $(call config_filename,MODULE_SIG_KEY)) 920 921mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509 922else 923mod_sign_cmd = true 924endif 925export mod_sign_cmd 926 927ifdef CONFIG_STACK_VALIDATION 928 has_libelf := $(call try-run,\ 929 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0) 930 ifeq ($(has_libelf),1) 931 objtool_target := tools/objtool FORCE 932 else 933 $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev, libelf-devel or elfutils-libelf-devel") 934 SKIP_STACK_VALIDATION := 1 935 export SKIP_STACK_VALIDATION 936 endif 937endif 938 939 940ifeq ($(KBUILD_EXTMOD),) 941core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ 942 943vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 944 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 945 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y))) 946 947vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 948 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-)))) 949 950init-y := $(patsubst %/, %/built-in.o, $(init-y)) 951core-y := $(patsubst %/, %/built-in.o, $(core-y)) 952drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 953net-y := $(patsubst %/, %/built-in.o, $(net-y)) 954libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 955libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y)) 956libs-y := $(libs-y1) $(libs-y2) 957virt-y := $(patsubst %/, %/built-in.o, $(virt-y)) 958 959# Externally visible symbols (used by link-vmlinux.sh) 960export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 961export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y) 962export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 963export LDFLAGS_vmlinux 964# used by scripts/pacmage/Makefile 965export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools) 966 967vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) 968 969# Include targets which we want to execute sequentially if the rest of the 970# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be 971# evaluated more than once. 972PHONY += vmlinux_prereq 973vmlinux_prereq: $(vmlinux-deps) FORCE 974ifdef CONFIG_HEADERS_CHECK 975 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 976endif 977ifdef CONFIG_GDB_SCRIPTS 978 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py 979endif 980ifdef CONFIG_TRIM_UNUSED_KSYMS 981 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ 982 "$(MAKE) -f $(srctree)/Makefile vmlinux" 983endif 984 985# standalone target for easier testing 986include/generated/autoksyms.h: FORCE 987 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true 988 989ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) 990 991# Final link of vmlinux with optional arch pass after final link 992 cmd_link-vmlinux = \ 993 $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ; \ 994 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) 995 996vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE 997 +$(call if_changed,link-vmlinux) 998 999# Build samples along the rest of the kernel 1000ifdef CONFIG_SAMPLES 1001vmlinux-dirs += samples 1002endif 1003 1004# The actual objects are generated when descending, 1005# make sure no implicit rule kicks in 1006$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 1007 1008# Handle descending into subdirectories listed in $(vmlinux-dirs) 1009# Preset locale variables to speed up the build process. Limit locale 1010# tweaks to this spot to avoid wrong language settings when running 1011# make menuconfig etc. 1012# Error messages still appears in the original language 1013 1014PHONY += $(vmlinux-dirs) 1015$(vmlinux-dirs): prepare scripts 1016 $(Q)$(MAKE) $(build)=$@ 1017 1018define filechk_kernel.release 1019 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1020endef 1021 1022# Store (new) KERNELRELEASE string in include/config/kernel.release 1023include/config/kernel.release: include/config/auto.conf FORCE 1024 $(call filechk,kernel.release) 1025 1026 1027# Things we need to do before we recursively start building the kernel 1028# or the modules are listed in "prepare". 1029# A multi level approach is used. prepareN is processed before prepareN-1. 1030# archprepare is used in arch Makefiles and when processed asm symlink, 1031# version.h and scripts_basic is processed / created. 1032 1033# Listed in dependency order 1034PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 1035 1036# prepare3 is used to check if we are building in a separate output directory, 1037# and if so do: 1038# 1) Check that make has not been executed in the kernel src $(srctree) 1039prepare3: include/config/kernel.release 1040ifneq ($(KBUILD_SRC),) 1041 @$(kecho) ' Using $(srctree) as source for kernel' 1042 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 1043 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 1044 echo >&2 " in the '$(srctree)' directory.";\ 1045 /bin/false; \ 1046 fi; 1047endif 1048 1049# prepare2 creates a makefile if using a separate output directory. 1050# From this point forward, .config has been reprocessed, so any rules 1051# that need to depend on updated CONFIG_* values can be checked here. 1052prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic 1053 1054prepare1: prepare2 $(version_h) include/generated/utsrelease.h \ 1055 include/config/auto.conf 1056 $(cmd_crmodverdir) 1057 1058archprepare: archheaders archscripts prepare1 scripts_basic 1059 1060prepare0: archprepare gcc-plugins 1061 $(Q)$(MAKE) $(build)=. 1062 1063# All the preparing.. 1064prepare: prepare0 prepare-objtool 1065 1066PHONY += prepare-objtool 1067prepare-objtool: $(objtool_target) 1068 1069# Check for CONFIG flags that require compiler support. Abort the build 1070# after .config has been processed, but before the kernel build starts. 1071# 1072# For security-sensitive CONFIG options, we don't want to fallback and/or 1073# silently change which compiler flags will be used, since that leads to 1074# producing kernels with different security feature characteristics 1075# depending on the compiler used. (For example, "But I selected 1076# CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!") 1077PHONY += prepare-compiler-check 1078prepare-compiler-check: FORCE 1079# Make sure compiler supports requested stack protector flag. 1080ifdef stackp-name 1081 ifeq ($(call cc-option, $(stackp-flag)),) 1082 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1083 $(stackp-flag) not supported by compiler >&2 && exit 1 1084 endif 1085endif 1086# Make sure compiler does not have buggy stack-protector support. 1087ifdef stackp-check 1088 ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y) 1089 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \ 1090 $(stackp-flag) available but compiler is broken >&2 && exit 1 1091 endif 1092endif 1093 @: 1094 1095# Generate some files 1096# --------------------------------------------------------------------------- 1097 1098# KERNELRELEASE can change from a few different places, meaning version.h 1099# needs to be updated, so this check is forced on all builds 1100 1101uts_len := 64 1102define filechk_utsrelease.h 1103 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 1104 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 1105 exit 1; \ 1106 fi; \ 1107 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 1108endef 1109 1110define filechk_version.h 1111 (echo \#define LINUX_VERSION_CODE $(shell \ 1112 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1113 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1114endef 1115 1116$(version_h): $(srctree)/Makefile FORCE 1117 $(call filechk,version.h) 1118 $(Q)rm -f $(old_version_h) 1119 1120include/generated/utsrelease.h: include/config/kernel.release FORCE 1121 $(call filechk,utsrelease.h) 1122 1123PHONY += headerdep 1124headerdep: 1125 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1126 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1127 1128# --------------------------------------------------------------------------- 1129# Firmware install 1130INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware 1131export INSTALL_FW_PATH 1132 1133PHONY += firmware_install 1134firmware_install: 1135 @mkdir -p $(objtree)/firmware 1136 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install 1137 1138# --------------------------------------------------------------------------- 1139# Kernel headers 1140 1141#Default location for installed headers 1142export INSTALL_HDR_PATH = $(objtree)/usr 1143 1144# If we do an all arch process set dst to asm-$(hdr-arch) 1145hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(hdr-arch), dst=include) 1146 1147PHONY += archheaders 1148archheaders: 1149 1150PHONY += archscripts 1151archscripts: 1152 1153PHONY += __headers 1154__headers: $(version_h) scripts_basic asm-generic archheaders archscripts 1155 $(Q)$(MAKE) $(build)=scripts build_unifdef 1156 1157PHONY += headers_install_all 1158headers_install_all: 1159 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1160 1161PHONY += headers_install 1162headers_install: __headers 1163 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \ 1164 $(error Headers not exportable for the $(SRCARCH) architecture)) 1165 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1166 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi $(hdr-dst) 1167 1168PHONY += headers_check_all 1169headers_check_all: headers_install_all 1170 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1171 1172PHONY += headers_check 1173headers_check: headers_install 1174 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1 1175 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi $(hdr-dst) HDRCHECK=1 1176 1177# --------------------------------------------------------------------------- 1178# Kernel selftest 1179 1180PHONY += kselftest 1181kselftest: 1182 $(Q)$(MAKE) -C tools/testing/selftests run_tests 1183 1184kselftest-clean: 1185 $(Q)$(MAKE) -C tools/testing/selftests clean 1186 1187PHONY += kselftest-merge 1188kselftest-merge: 1189 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) 1190 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \ 1191 -m $(objtree)/.config \ 1192 $(srctree)/tools/testing/selftests/*/config 1193 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 1194 1195# --------------------------------------------------------------------------- 1196# Modules 1197 1198ifdef CONFIG_MODULES 1199 1200# By default, build modules as well 1201 1202all: modules 1203 1204# Build modules 1205# 1206# A module can be listed more than once in obj-m resulting in 1207# duplicate lines in modules.order files. Those are removed 1208# using awk while concatenating to the final file. 1209 1210PHONY += modules 1211modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1212 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1213 @$(kecho) ' Building modules, stage 2.'; 1214 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1215 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild 1216 1217modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1218 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1219 1220%/modules.builtin: include/config/auto.conf 1221 $(Q)$(MAKE) $(modbuiltin)=$* 1222 1223 1224# Target to prepare building external modules 1225PHONY += modules_prepare 1226modules_prepare: prepare scripts 1227 1228# Target to install modules 1229PHONY += modules_install 1230modules_install: _modinst_ _modinst_post 1231 1232PHONY += _modinst_ 1233_modinst_: 1234 @rm -rf $(MODLIB)/kernel 1235 @rm -f $(MODLIB)/source 1236 @mkdir -p $(MODLIB)/kernel 1237 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source 1238 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1239 rm -f $(MODLIB)/build ; \ 1240 ln -s $(CURDIR) $(MODLIB)/build ; \ 1241 fi 1242 @cp -f $(objtree)/modules.order $(MODLIB)/ 1243 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1244 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1245 1246# This depmod is only for convenience to give the initial 1247# boot a modules.dep even before / is mounted read-write. However the 1248# boot script depmod is the master version. 1249PHONY += _modinst_post 1250_modinst_post: _modinst_ 1251 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst 1252 $(call cmd,depmod) 1253 1254ifeq ($(CONFIG_MODULE_SIG), y) 1255PHONY += modules_sign 1256modules_sign: 1257 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1258endif 1259 1260else # CONFIG_MODULES 1261 1262# Modules not configured 1263# --------------------------------------------------------------------------- 1264 1265PHONY += modules modules_install 1266modules modules_install: 1267 @echo >&2 1268 @echo >&2 "The present kernel configuration has modules disabled." 1269 @echo >&2 "Type 'make config' and enable loadable module support." 1270 @echo >&2 "Then build a kernel with module support enabled." 1271 @echo >&2 1272 @exit 1 1273 1274endif # CONFIG_MODULES 1275 1276### 1277# Cleaning is done on three levels. 1278# make clean Delete most generated files 1279# Leave enough to build external modules 1280# make mrproper Delete the current configuration, and all generated files 1281# make distclean Remove editor backup files, patch leftover files and the like 1282 1283# Directories & files removed with 'make clean' 1284CLEAN_DIRS += $(MODVERDIR) 1285 1286# Directories & files removed with 'make mrproper' 1287MRPROPER_DIRS += include/config usr/include include/generated \ 1288 arch/*/include/generated .tmp_objdiff 1289MRPROPER_FILES += .config .config.old .version .old_version \ 1290 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1291 signing_key.pem signing_key.priv signing_key.x509 \ 1292 x509.genkey extra_certificates signing_key.x509.keyid \ 1293 signing_key.x509.signer vmlinux-gdb.py 1294 1295# clean - Delete most, but leave enough to build external modules 1296# 1297clean: rm-dirs := $(CLEAN_DIRS) 1298clean: rm-files := $(CLEAN_FILES) 1299clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1300 1301PHONY += $(clean-dirs) clean archclean vmlinuxclean 1302$(clean-dirs): 1303 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1304 1305vmlinuxclean: 1306 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1307 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) 1308 1309clean: archclean vmlinuxclean 1310 1311# mrproper - Delete all generated files, including .config 1312# 1313mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1314mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1315mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts) 1316 1317PHONY += $(mrproper-dirs) mrproper archmrproper 1318$(mrproper-dirs): 1319 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1320 1321mrproper: clean archmrproper $(mrproper-dirs) 1322 $(call cmd,rmdirs) 1323 $(call cmd,rmfiles) 1324 1325# distclean 1326# 1327PHONY += distclean 1328 1329distclean: mrproper 1330 @find $(srctree) $(RCS_FIND_IGNORE) \ 1331 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1332 -o -name '*.bak' -o -name '#*#' -o -name '*%' \ 1333 -o -name 'core' \) \ 1334 -type f -print | xargs rm -f 1335 1336 1337# Packaging of the kernel to various formats 1338# --------------------------------------------------------------------------- 1339# rpm target kept for backward compatibility 1340package-dir := scripts/package 1341 1342%src-pkg: FORCE 1343 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1344%pkg: include/config/kernel.release FORCE 1345 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1346rpm: include/config/kernel.release FORCE 1347 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1348 1349 1350# Brief documentation of the typical targets used 1351# --------------------------------------------------------------------------- 1352 1353boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1354boards := $(sort $(notdir $(boards))) 1355board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1356board-dirs := $(sort $(notdir $(board-dirs:/=))) 1357 1358PHONY += help 1359help: 1360 @echo 'Cleaning targets:' 1361 @echo ' clean - Remove most generated files but keep the config and' 1362 @echo ' enough build support to build external modules' 1363 @echo ' mrproper - Remove all generated files + config + various backup files' 1364 @echo ' distclean - mrproper + remove editor backup and patch files' 1365 @echo '' 1366 @echo 'Configuration targets:' 1367 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1368 @echo '' 1369 @echo 'Other generic targets:' 1370 @echo ' all - Build all targets marked with [*]' 1371 @echo '* vmlinux - Build the bare kernel' 1372 @echo '* modules - Build all modules' 1373 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1374 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH' 1375 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)' 1376 @echo ' dir/ - Build all files in dir and below' 1377 @echo ' dir/file.[ois] - Build specified target only' 1378 @echo ' dir/file.ll - Build the LLVM assembly file' 1379 @echo ' (requires compiler support for LLVM assembly generation)' 1380 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1381 @echo ' (requires a recent binutils and recent build (System.map))' 1382 @echo ' dir/file.ko - Build module including final link' 1383 @echo ' modules_prepare - Set up for building external modules' 1384 @echo ' tags/TAGS - Generate tags file for editors' 1385 @echo ' cscope - Generate cscope index' 1386 @echo ' gtags - Generate GNU GLOBAL index' 1387 @echo ' kernelrelease - Output the release version string (use with make -s)' 1388 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1389 @echo ' image_name - Output the image name (use with make -s)' 1390 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1391 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1392 echo '' 1393 @echo 'Static analysers:' 1394 @echo ' checkstack - Generate a list of stack hogs' 1395 @echo ' namespacecheck - Name space analysis on compiled kernel' 1396 @echo ' versioncheck - Sanity check on version.h usage' 1397 @echo ' includecheck - Check for duplicate included header files' 1398 @echo ' export_report - List the usages of all exported symbols' 1399 @echo ' headers_check - Sanity check on exported headers' 1400 @echo ' headerdep - Detect inclusion cycles in headers' 1401 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help 1402 @echo '' 1403 @echo 'Kernel selftest:' 1404 @echo ' kselftest - Build and run kernel selftest (run as root)' 1405 @echo ' Build, install, and boot kernel before' 1406 @echo ' running kselftest on it' 1407 @echo ' kselftest-clean - Remove all generated kselftest files' 1408 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existed' 1409 @echo ' .config.' 1410 @echo '' 1411 @echo 'Userspace tools targets:' 1412 @echo ' use "make tools/help"' 1413 @echo ' or "cd tools; make help"' 1414 @echo '' 1415 @echo 'Kernel packaging:' 1416 @$(MAKE) $(build)=$(package-dir) help 1417 @echo '' 1418 @echo 'Documentation targets:' 1419 @$(MAKE) -f $(srctree)/Documentation/Makefile.sphinx dochelp 1420 @echo '' 1421 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp 1422 @echo '' 1423 @echo 'Architecture specific targets ($(SRCARCH)):' 1424 @$(if $(archhelp),$(archhelp),\ 1425 echo ' No architecture specific help defined for $(SRCARCH)') 1426 @echo '' 1427 @$(if $(boards), \ 1428 $(foreach b, $(boards), \ 1429 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1430 echo '') 1431 @$(if $(board-dirs), \ 1432 $(foreach b, $(board-dirs), \ 1433 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1434 printf " %-16s - Show all of the above\\n" help-boards; \ 1435 echo '') 1436 1437 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1438 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1439 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1440 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)' 1441 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1442 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1443 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1444 @echo ' 1: warnings which may be relevant and do not occur too often' 1445 @echo ' 2: warnings which occur quite often but may still be relevant' 1446 @echo ' 3: more obscure warnings, can most likely be ignored' 1447 @echo ' Multiple levels can be combined with W=12 or W=123' 1448 @echo '' 1449 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1450 @echo 'For further info see the ./README file' 1451 1452 1453help-board-dirs := $(addprefix help-,$(board-dirs)) 1454 1455help-boards: $(help-board-dirs) 1456 1457boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) 1458 1459$(help-board-dirs): help-%: 1460 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1461 @$(if $(boards-per-dir), \ 1462 $(foreach b, $(boards-per-dir), \ 1463 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1464 echo '') 1465 1466 1467# Documentation targets 1468# --------------------------------------------------------------------------- 1469DOC_TARGETS := xmldocs sgmldocs psdocs latexdocs pdfdocs htmldocs mandocs installmandocs epubdocs cleandocs linkcheckdocs 1470PHONY += $(DOC_TARGETS) 1471$(DOC_TARGETS): scripts_basic FORCE 1472 $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype 1473 $(Q)$(MAKE) $(build)=Documentation -f $(srctree)/Documentation/Makefile.sphinx $@ 1474 $(Q)$(MAKE) $(build)=Documentation/DocBook $@ 1475 1476else # KBUILD_EXTMOD 1477 1478### 1479# External module support. 1480# When building external modules the kernel used as basis is considered 1481# read-only, and no consistency checks are made and the make 1482# system is not used on the basis kernel. If updates are required 1483# in the basis kernel ordinary make commands (without M=...) must 1484# be used. 1485# 1486# The following are the only valid targets when building external 1487# modules. 1488# make M=dir clean Delete all automatically generated files 1489# make M=dir modules Make all modules in specified dir 1490# make M=dir Same as 'make M=dir modules' 1491# make M=dir modules_install 1492# Install the modules built in the module directory 1493# Assumes install directory is already created 1494 1495# We are always building modules 1496KBUILD_MODULES := 1 1497PHONY += crmodverdir 1498crmodverdir: 1499 $(cmd_crmodverdir) 1500 1501PHONY += $(objtree)/Module.symvers 1502$(objtree)/Module.symvers: 1503 @test -e $(objtree)/Module.symvers || ( \ 1504 echo; \ 1505 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1506 echo " is missing; modules will have no dependencies and modversions."; \ 1507 echo ) 1508 1509module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1510PHONY += $(module-dirs) modules 1511$(module-dirs): crmodverdir $(objtree)/Module.symvers 1512 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1513 1514modules: $(module-dirs) 1515 @$(kecho) ' Building modules, stage 2.'; 1516 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1517 1518PHONY += modules_install 1519modules_install: _emodinst_ _emodinst_post 1520 1521install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1522PHONY += _emodinst_ 1523_emodinst_: 1524 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1525 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1526 1527PHONY += _emodinst_post 1528_emodinst_post: _emodinst_ 1529 $(call cmd,depmod) 1530 1531clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1532 1533PHONY += $(clean-dirs) clean 1534$(clean-dirs): 1535 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1536 1537clean: rm-dirs := $(MODVERDIR) 1538clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1539 1540PHONY += help 1541help: 1542 @echo ' Building external modules.' 1543 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1544 @echo '' 1545 @echo ' modules - default target, build the module(s)' 1546 @echo ' modules_install - install the module' 1547 @echo ' clean - remove generated files in module directory only' 1548 @echo '' 1549 1550# Dummies... 1551PHONY += prepare scripts 1552prepare: ; 1553scripts: ; 1554endif # KBUILD_EXTMOD 1555 1556clean: $(clean-dirs) 1557 $(call cmd,rmdirs) 1558 $(call cmd,rmfiles) 1559 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1560 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 1561 -o -name '*.ko.*' \ 1562 -o -name '*.dwo' \ 1563 -o -name '*.su' \ 1564 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1565 -o -name '*.symtypes' -o -name 'modules.order' \ 1566 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1567 -o -name '*.c.[012]*.*' \ 1568 -o -name '*.ll' \ 1569 -o -name '*.gcno' \) -type f -print | xargs rm -f 1570 1571# Generate tags for editors 1572# --------------------------------------------------------------------------- 1573quiet_cmd_tags = GEN $@ 1574 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1575 1576tags TAGS cscope gtags: FORCE 1577 $(call cmd,tags) 1578 1579# Scripts to check various things for consistency 1580# --------------------------------------------------------------------------- 1581 1582PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1583 1584includecheck: 1585 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1586 -name '*.[hcS]' -type f -print | sort \ 1587 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1588 1589versioncheck: 1590 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1591 -name '*.[hcS]' -type f -print | sort \ 1592 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1593 1594coccicheck: 1595 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1596 1597namespacecheck: 1598 $(PERL) $(srctree)/scripts/namespace.pl 1599 1600export_report: 1601 $(PERL) $(srctree)/scripts/export_report.pl 1602 1603endif #ifeq ($(config-targets),1) 1604endif #ifeq ($(mixed-targets),1) 1605 1606PHONY += checkstack kernelrelease kernelversion image_name 1607 1608# UML needs a little special treatment here. It wants to use the host 1609# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1610# else wants $(ARCH), including people doing cross-builds, which means 1611# that $(SUBARCH) doesn't work here. 1612ifeq ($(ARCH), um) 1613CHECKSTACK_ARCH := $(SUBARCH) 1614else 1615CHECKSTACK_ARCH := $(ARCH) 1616endif 1617checkstack: 1618 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1619 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1620 1621kernelrelease: 1622 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1623 1624kernelversion: 1625 @echo $(KERNELVERSION) 1626 1627image_name: 1628 @echo $(KBUILD_IMAGE) 1629 1630# Clear a bunch of variables before executing the submake 1631tools/: FORCE 1632 $(Q)mkdir -p $(objtree)/tools 1633 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ 1634 1635tools/%: FORCE 1636 $(Q)mkdir -p $(objtree)/tools 1637 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $* 1638 1639# Single targets 1640# --------------------------------------------------------------------------- 1641# Single targets are compatible with: 1642# - build with mixed source and output 1643# - build with separate output dir 'make O=...' 1644# - external modules 1645# 1646# target-dir => where to store outputfile 1647# build-dir => directory in kernel source tree to use 1648 1649ifeq ($(KBUILD_EXTMOD),) 1650 build-dir = $(patsubst %/,%,$(dir $@)) 1651 target-dir = $(dir $@) 1652else 1653 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1654 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1655 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1656endif 1657 1658%.s: %.c prepare scripts FORCE 1659 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1660%.i: %.c prepare scripts FORCE 1661 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1662%.o: %.c prepare scripts FORCE 1663 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1664%.lst: %.c prepare scripts FORCE 1665 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1666%.s: %.S prepare scripts FORCE 1667 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1668%.o: %.S prepare scripts FORCE 1669 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1670%.symtypes: %.c prepare scripts FORCE 1671 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1672%.ll: %.c prepare scripts FORCE 1673 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1674 1675# Modules 1676/: prepare scripts FORCE 1677 $(cmd_crmodverdir) 1678 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1679 $(build)=$(build-dir) 1680# Make sure the latest headers are built for Documentation 1681Documentation/ samples/: headers_install 1682%/: prepare scripts FORCE 1683 $(cmd_crmodverdir) 1684 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1685 $(build)=$(build-dir) 1686%.ko: prepare scripts FORCE 1687 $(cmd_crmodverdir) 1688 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1689 $(build)=$(build-dir) $(@:.ko=.o) 1690 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1691 1692# FIXME Should go into a make.lib or something 1693# =========================================================================== 1694 1695quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1696 cmd_rmdirs = rm -rf $(rm-dirs) 1697 1698quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1699 cmd_rmfiles = rm -f $(rm-files) 1700 1701# Run depmod only if we have System.map and depmod is executable 1702quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1703 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1704 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))" 1705 1706# Create temporary dir for module support files 1707# clean it up only when building all modules 1708cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1709 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1710 1711# read all saved command lines 1712 1713targets := $(wildcard $(sort $(targets))) 1714cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 1715 1716ifneq ($(cmd_files),) 1717 $(cmd_files): ; # Do not try to update included dependency files 1718 include $(cmd_files) 1719endif 1720 1721endif # skip-makefile 1722 1723PHONY += FORCE 1724FORCE: 1725 1726# Declare the contents of the .PHONY variable as phony. We keep that 1727# information in a variable so we can use it in if_changed and friends. 1728.PHONY: $(PHONY) 1729